W: https://parisc.wiki.kernel.org/index.php/AD1889
F: sound/pci/ad1889.*
+AD5110 ANALOG DEVICES DIGITAL POTENTIOMETERS DRIVER
+M: Mugilraj Dhavachelvan <dmugil2000@gmail.com>
+L: linux-iio@vger.kernel.org
+S: Supported
+F: drivers/iio/potentiometer/ad5110.c
+
AD525X ANALOG DEVICES DIGITAL POTENTIOMETERS DRIVER
M: Michael Hennerich <michael.hennerich@analog.com>
S: Supported
S: Maintained
F: drivers/media/i2c/aptina-pll.*
+AQUACOMPUTER D5 NEXT PUMP SENSOR DRIVER
+M: Aleksa Savic <savicaleksa83@gmail.com>
+L: linux-hwmon@vger.kernel.org
+S: Maintained
+F: Documentation/hwmon/aquacomputer_d5next.rst
+F: drivers/hwmon/aquacomputer_d5next.c
+
AQUANTIA ETHERNET DRIVER (atlantic)
M: Igor Russkikh <irusskikh@marvell.com>
L: netdev@vger.kernel.org
F: Documentation/devicetree/bindings/arm/arm,realview.yaml
F: Documentation/devicetree/bindings/arm/arm,versatile.yaml
F: Documentation/devicetree/bindings/arm/arm,vexpress-juno.yaml
-F: Documentation/devicetree/bindings/auxdisplay/arm-charlcd.txt
+F: Documentation/devicetree/bindings/auxdisplay/arm,versatile-lcd.yaml
F: Documentation/devicetree/bindings/clock/arm,syscon-icst.yaml
F: Documentation/devicetree/bindings/i2c/i2c-versatile.txt
F: Documentation/devicetree/bindings/interrupt-controller/arm,versatile-fpga-irq.txt
M: Naga Sureshkumar Relli <nagasure@xilinx.com>
L: linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
S: Maintained
-F: Documentation/devicetree/bindings/mtd/arm,pl353-smc.yaml
+F: Documentation/devicetree/bindings/memory-controllers/arm,pl353-smc.yaml
F: drivers/memory/pl353-smc.c
ARM PRIMECELL CLCD PL110 DRIVER
S: Maintained
W: https://asahilinux.org
B: https://github.com/AsahiLinux/linux/issues
-C: irc://chat.freenode.net/asahi-dev
+C: irc://irc.oftc.net/asahi-dev
T: git https://github.com/AsahiLinux/linux.git
F: Documentation/devicetree/bindings/arm/apple.yaml
F: Documentation/devicetree/bindings/interrupt-controller/apple,aic.yaml
L: linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
S: Maintained
F: Documentation/devicetree/bindings/arm/intel-ixp4xx.yaml
+F: Documentation/devicetree/bindings/bus/intel,ixp4xx-expansion-bus-controller.yaml
F: Documentation/devicetree/bindings/gpio/intel,ixp4xx-gpio.txt
F: Documentation/devicetree/bindings/interrupt-controller/intel,ixp4xx-interrupt.yaml
F: Documentation/devicetree/bindings/timer/intel,ixp4xx-timer.yaml
F: arch/arm/mach-ixp4xx/
+F: drivers/bus/intel-ixp4xx-eb.c
F: drivers/clocksource/timer-ixp4xx.c
F: drivers/crypto/ixp4xx_crypto.c
F: drivers/gpio/gpio-ixp4xx.c
M: Sakari Ailus <sakari.ailus@iki.fi>
L: linux-leds@vger.kernel.org
S: Maintained
-F: drivers/leds/leds-as3645a.c
+F: drivers/leds/flash/leds-as3645a.c
ASAHI KASEI AK7375 LENS VOICE COIL DRIVER
M: Tianshu Qiu <tian.shu.qiu@intel.com>
W: https://www.open-mesh.org/
Q: https://patchwork.open-mesh.org/project/batman/list/
B: https://www.open-mesh.org/projects/batman-adv/issues
-C: irc://chat.freenode.net/batman
+C: ircs://irc.hackint.org/batadv
T: git https://git.open-mesh.org/linux-merge.git
F: Documentation/networking/batman-adv.rst
F: include/uapi/linux/batadv_packet.h
BPF JIT for POWERPC (32-BIT AND 64-BIT)
M: Naveen N. Rao <naveen.n.rao@linux.ibm.com>
-M: Sandipan Das <sandipan@linux.ibm.com>
L: netdev@vger.kernel.org
L: bpf@vger.kernel.org
S: Maintained
M: bcm-kernel-feedback-list@broadcom.com
L: linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
S: Maintained
-F: Documentation/devicetree/bindings/memory-controllers/brcm,dpfe-cpu.txt
+F: Documentation/devicetree/bindings/memory-controllers/brcm,dpfe-cpu.yaml
F: drivers/memory/brcmstb_dpfe.c
BROADCOM STB NAND FLASH DRIVER
S: Maintained
F: drivers/mtd/nand/raw/brcmnand/
+BROADCOM STB PCIE DRIVER
+M: Jim Quinlan <jim2101024@gmail.com>
+M: Nicolas Saenz Julienne <nsaenz@kernel.org>
+M: Florian Fainelli <f.fainelli@gmail.com>
+M: bcm-kernel-feedback-list@broadcom.com
+L: linux-pci@vger.kernel.org
+S: Maintained
+F: Documentation/devicetree/bindings/pci/brcm,stb-pcie.yaml
+F: drivers/pci/controller/pcie-brcmstb.c
+
BROADCOM SYSTEMPORT ETHERNET DRIVER
M: Florian Fainelli <f.fainelli@gmail.com>
L: bcm-kernel-feedback-list@broadcom.com
S: Supported
W: https://clangbuiltlinux.github.io/
B: https://github.com/ClangBuiltLinux/linux/issues
-C: irc://chat.freenode.net/clangbuiltlinux
+C: irc://irc.libera.chat/clangbuiltlinux
F: Documentation/kbuild/llvm.rst
F: include/linux/compiler-clang.h
F: scripts/clang-tools/
F: include/linux/of_clk.h
X: drivers/clk/clkdev.c
-COMMON INTERNET FILE SYSTEM (CIFS)
+COMMON INTERNET FILE SYSTEM CLIENT (CIFS)
M: Steve French <sfrench@samba.org>
L: linux-cifs@vger.kernel.org
L: samba-technical@lists.samba.org (moderated for non-subscribers)
T: git git://git.samba.org/sfrench/cifs-2.6.git
F: Documentation/admin-guide/cifs/
F: fs/cifs/
+F: fs/cifs_common/
COMPACTPCI HOTPLUG CORE
M: Scott Murray <scott@spiteful.org>
L: linux-pm@vger.kernel.org
L: linux-samsung-soc@vger.kernel.org
S: Maintained
-F: Documentation/devicetree/bindings/memory-controllers/exynos5422-dmc.txt
+F: Documentation/devicetree/bindings/memory-controllers/samsung,exynos5422-dmc.yaml
F: drivers/memory/samsung/exynos5422-dmc.c
DME1737 HARDWARE MONITOR DRIVER
M: Ioana Ciornei <ioana.ciornei@nxp.com>
L: netdev@vger.kernel.org
S: Maintained
+F: Documentation/networking/device_drivers/ethernet/freescale/dpaa2/switch-driver.rst
F: drivers/net/ethernet/freescale/dpaa2/dpaa2-switch*
F: drivers/net/ethernet/freescale/dpaa2/dpsw*
F: drivers/block/drbd/
F: lib/lru_cache.c
+DRIVER COMPONENT FRAMEWORK
+L: dri-devel@lists.freedesktop.org
+F: drivers/base/component.c
+F: include/linux/component.h
+
DRIVER CORE, KOBJECTS, DEBUGFS AND SYSFS
M: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
R: "Rafael J. Wysocki" <rafael@kernel.org>
L: virtualization@lists.linux-foundation.org
S: Maintained
T: git git://anongit.freedesktop.org/drm/drm-misc
-F: drivers/gpu/drm/bochs/
+F: drivers/gpu/drm/tiny/bochs.c
DRM DRIVER FOR BOE HIMAX8279D PANELS
M: Jerry Han <hanxu5@huaqin.corp-partner.google.com>
F: Documentation/devicetree/bindings/display/panel/raydium,rm67191.yaml
F: drivers/gpu/drm/panel/panel-raydium-rm67191.c
+DRM DRIVER FOR SAMSUNG DB7430 PANELS
+M: Linus Walleij <linus.walleij@linaro.org>
+S: Maintained
+T: git git://anongit.freedesktop.org/drm/drm-misc
+F: Documentation/devicetree/bindings/display/panel/samsung,lms397kf04.yaml
+F: drivers/gpu/drm/panel/panel-samsung-db7430.c
+
DRM DRIVER FOR SITRONIX ST7703 PANELS
M: Guido Günther <agx@sigxcpu.org>
R: Purism Kernel Team <kernel@puri.sm>
DRM DRIVER FOR VMWARE VIRTUAL GPU
M: "VMware Graphics" <linux-graphics-maintainer@vmware.com>
-M: Roland Scheidegger <sroland@vmware.com>
M: Zack Rusin <zackr@vmware.com>
L: dri-devel@lists.freedesktop.org
S: Supported
-T: git git://people.freedesktop.org/~sroland/linux
+T: git git://anongit.freedesktop.org/drm/drm-misc
F: drivers/gpu/drm/vmwgfx/
F: include/uapi/drm/vmwgfx_drm.h
+DRM DRIVER FOR WIDECHIPS WS2401 PANELS
+M: Linus Walleij <linus.walleij@linaro.org>
+S: Maintained
+T: git git://anongit.freedesktop.org/drm/drm-misc
+F: Documentation/devicetree/bindings/display/panel/samsung,lms380kf01.yaml
+F: drivers/gpu/drm/panel/panel-widechips-ws2401.c
+
DRM DRIVERS
M: David Airlie <airlied@linux.ie>
M: Daniel Vetter <daniel@ffwll.ch>
L: dri-devel@lists.freedesktop.org
S: Maintained
B: https://gitlab.freedesktop.org/drm
-C: irc://chat.freenode.net/dri-devel
+C: irc://irc.oftc.net/dri-devel
T: git git://anongit.freedesktop.org/drm/drm
F: Documentation/devicetree/bindings/display/
F: Documentation/devicetree/bindings/gpu/
M: Jan Luebbe <jlu@pengutronix.de>
L: linux-edac@vger.kernel.org
S: Maintained
+F: Documentation/devicetree/bindings/memory-controllers/marvell,mvebu-sdram-controller.yaml
F: drivers/edac/armada_xp_*
EDAC-AST2500
S: Odd Fixes
F: drivers/net/ethernet/agere/
+ETAS ES58X CAN/USB DRIVER
+M: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
+L: linux-can@vger.kernel.org
+S: Maintained
+F: drivers/net/can/usb/etas_es58x/
+
ETHERNET BRIDGE
M: Roopa Prabhu <roopa@nvidia.com>
M: Nikolay Aleksandrov <nikolay@nvidia.com>
F: include/uapi/linux/mii.h
EXFAT FILE SYSTEM
-M: Namjae Jeon <namjae.jeon@samsung.com>
+M: Namjae Jeon <linkinjeon@kernel.org>
M: Sungjong Seo <sj1557.seo@samsung.com>
L: linux-fsdevel@vger.kernel.org
S: Maintained
F: Documentation/devicetree/bindings/spmi/hisilicon,hisi-spmi-controller.yaml
F: drivers/spmi/hisi-spmi-controller.c
-HISILICON STAGING DRIVERS FOR HIKEY 960/970
+HISILICON SPMI PMIC DRIVER FOR HIKEY 6421v600
M: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
+L: linux-kernel@vger.kernel.org
S: Maintained
-F: drivers/staging/hikey9xx/
+F: Documentation/devicetree/bindings/mfd/hisilicon,hi6421-spmi-pmic.yaml
+F: drivers/mfd/hi6421-spmi-pmic.c
HISILICON TRUE RANDOM NUMBER GENERATOR V2 SUPPORT
M: Zaibo Xu <xuzaibo@huawei.com>
F: Documentation/ABI/stable/sysfs-bus-vmbus
F: Documentation/ABI/testing/debugfs-hyperv
F: Documentation/networking/device_drivers/ethernet/microsoft/netvsc.rst
+F: arch/arm64/hyperv
+F: arch/arm64/include/asm/hyperv-tlfs.h
+F: arch/arm64/include/asm/mshyperv.h
F: arch/x86/hyperv
F: arch/x86/include/asm/hyperv-tlfs.h
F: arch/x86/include/asm/mshyperv.h
IMGTEC ASCII LCD DRIVER
M: Paul Burton <paulburton@kernel.org>
S: Maintained
-F: Documentation/devicetree/bindings/auxdisplay/img-ascii-lcd.txt
+F: Documentation/devicetree/bindings/auxdisplay/img,ascii-lcd.yaml
F: drivers/auxdisplay/img-ascii-lcd.c
IMGTEC IR DECODER DRIVER
W: https://01.org/linuxgraphics/
Q: http://patchwork.freedesktop.org/project/intel-gfx/
B: https://gitlab.freedesktop.org/drm/intel/-/wikis/How-to-file-i915-bugs
-C: irc://chat.freenode.net/intel-gfx
+C: irc://irc.oftc.net/intel-gfx
T: git git://anongit.freedesktop.org/drm-intel
F: Documentation/gpu/i915.rst
F: drivers/gpu/drm/i915/
S: Odd Fixes
F: drivers/tty/ipwireless/
-IPX NETWORK LAYER
-L: netdev@vger.kernel.org
-S: Obsolete
-F: include/uapi/linux/ipx.h
-
IRQ DOMAINS (IRQ NUMBER MAPPING LIBRARY)
M: Marc Zyngier <maz@kernel.org>
S: Maintained
F: Documentation/dev-tools/kselftest*
F: tools/testing/selftests/
+KERNEL SMB3 SERVER (KSMBD)
+M: Namjae Jeon <linkinjeon@kernel.org>
+M: Sergey Senozhatsky <senozhatsky@chromium.org>
+M: Steve French <sfrench@samba.org>
+M: Hyunchul Lee <hyc.lee@gmail.com>
+L: linux-cifs@vger.kernel.org
+S: Maintained
+T: git git://git.samba.org/ksmbd.git
+F: fs/cifs_common/
+F: fs/ksmbd/
+
KERNEL UNIT TESTING FRAMEWORK (KUnit)
M: Brendan Higgins <brendanhiggins@google.com>
L: linux-kselftest@vger.kernel.org
F: net/core/sock_map.c
F: net/ipv4/tcp_bpf.c
F: net/ipv4/udp_bpf.c
+F: net/unix/unix_bpf.c
LANDLOCK SECURITY MODULE
M: Mickaël Salaün <mic@digikod.net>
F: scripts/spdxcheck-test.sh
F: scripts/spdxcheck.py
-LIGHTNVM PLATFORM SUPPORT
-M: Matias Bjorling <mb@lightnvm.io>
-L: linux-block@vger.kernel.org
-S: Maintained
-W: http://github/OpenChannelSSD
-F: drivers/lightnvm/
-F: include/linux/lightnvm.h
-F: include/uapi/linux/lightnvm.h
-
LINEAR RANGES HELPERS
M: Mark Brown <broonie@kernel.org>
R: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
F: include/linux/mailbox/arm_mhuv2_message.h
F: Documentation/devicetree/bindings/mailbox/arm,mhuv2.yaml
+MANAGEMENT COMPONENT TRANSPORT PROTOCOL (MCTP)
+M: Jeremy Kerr <jk@codeconstruct.com.au>
+M: Matt Johnston <matt@codeconstruct.com.au>
+L: netdev@vger.kernel.org
+S: Maintained
+F: Documentation/networking/mctp.rst
+F: drivers/net/mctp/
+F: include/net/mctp.h
+F: include/net/mctpdevice.h
+F: include/net/netns/mctp.h
+F: net/mctp/
+
MAN-PAGES: MANUAL PAGES FOR LINUX -- Sections 2, 3, 4, 5, and 7
M: Michael Kerrisk <mtk.manpages@gmail.com>
L: linux-man@vger.kernel.org
T: git git://linuxtv.org/media_tree.git
F: drivers/media/radio/radio-maxiradio*
-MCAB MICROCHIP CAN BUS ANALYZER TOOL DRIVER
+MAXLINEAR ETHERNET PHY DRIVER
+M: Xu Liang <lxu@maxlinear.com>
+L: netdev@vger.kernel.org
+S: Supported
+F: drivers/net/phy/mxl-gpy.c
+
+MCBA MICROCHIP CAN BUS ANALYZER TOOL DRIVER
R: Yasushi SHOJI <yashi@spacecubics.com>
L: linux-can@vger.kernel.org
S: Maintained
F: Documentation/devicetree/bindings/media/i2c/ov8856.yaml
F: drivers/media/i2c/ov8856.c
+OMNIVISION OV9282 SENSOR DRIVER
+M: Paul J. Murphy <paul.j.murphy@intel.com>
+M: Daniele Alessandrelli <daniele.alessandrelli@intel.com>
+L: linux-media@vger.kernel.org
+S: Maintained
+T: git git://linuxtv.org/media_tree.git
+F: Documentation/devicetree/bindings/media/i2c/ovti,ov9282.yaml
+F: drivers/media/i2c/ov9282.c
+
OMNIVISION OV9640 SENSOR DRIVER
M: Petr Cvek <petrcvekcz@gmail.com>
L: linux-media@vger.kernel.org
F: arch/*/boot/dts/
F: include/dt-bindings/
+OPENCOMPUTE PTP CLOCK DRIVER
+M: Jonathan Lemon <jonathan.lemon@gmail.com>
+L: netdev@vger.kernel.org
+S: Maintained
+F: drivers/ptp/ptp_ocp.c
+
OPENCORES I2C BUS DRIVER
M: Peter Korsgaard <peter@korsgaard.com>
M: Andrew Lunn <andrew@lunn.ch>
L: linux-pci@vger.kernel.org
L: linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
S: Maintained
-F: Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
+F: Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml
F: drivers/pci/controller/dwc/*imx6*
PCI DRIVER FOR FU740
M: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
L: linux-pci@vger.kernel.org
S: Maintained
-F: Documentation/devicetree/bindings/pci/designware-pcie.txt
+F: Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml
+F: Documentation/devicetree/bindings/pci/snps,dw-pcie-ep.yaml
F: drivers/pci/controller/dwc/*designware*
PCI DRIVER FOR TI DRA7XX/J721E
M: Binghui Wang <wangbinghui@hisilicon.com>
L: linux-pci@vger.kernel.org
S: Maintained
-F: Documentation/devicetree/bindings/pci/kirin-pcie.txt
+F: Documentation/devicetree/bindings/pci/hisilicon,kirin-pcie.yaml
F: drivers/pci/controller/dwc/pcie-kirin.c
PCIE DRIVER FOR HISILICON STB
F: Documentation/devicetree/bindings/pci/hisilicon-histb-pcie.txt
F: drivers/pci/controller/dwc/pcie-histb.c
+PCIE DRIVER FOR INTEL LGM GW SOC
+M: Rahul Tanwar <rtanwar@maxlinear.com>
+L: linux-pci@vger.kernel.org
+S: Maintained
+F: Documentation/devicetree/bindings/pci/intel-gw-pcie.yaml
+F: drivers/pci/controller/dwc/pcie-intel-gw.c
+
PCIE DRIVER FOR MEDIATEK
M: Ryder Lee <ryder.lee@mediatek.com>
M: Jianjun Wang <jianjun.wang@mediatek.com>
F: include/linux/printk.h
F: kernel/printk/
-PRISM54 WIRELESS DRIVER
-M: Luis Chamberlain <mcgrof@kernel.org>
-L: linux-wireless@vger.kernel.org
-S: Obsolete
-W: https://wireless.wiki.kernel.org/en/users/Drivers/p54
-F: drivers/net/wireless/intersil/prism54/
+PRINTK INDEXING
+R: Chris Down <chris@chrisdown.name>
+S: Maintained
+F: kernel/printk/index.c
PROC FILESYSTEM
L: linux-kernel@vger.kernel.org
F: drivers/i2c/busses/i2c-emev2.c
RENESAS ETHERNET DRIVERS
-R: Sergei Shtylyov <sergei.shtylyov@gmail.com>
+R: Sergey Shtylyov <s.shtylyov@omp.ru>
L: netdev@vger.kernel.org
L: linux-renesas-soc@vger.kernel.org
F: Documentation/devicetree/bindings/net/renesas,*.yaml
S: Maintained
F: drivers/phy/renesas/phy-rcar-gen3-usb*.c
+RENESAS RZ/G2L A/D DRIVER
+M: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
+L: linux-iio@vger.kernel.org
+L: linux-renesas-soc@vger.kernel.org
+S: Supported
+F: Documentation/devicetree/bindings/iio/adc/renesas,rzg2l-adc.yaml
+F: drivers/iio/adc/rzg2l_adc.c
+
RESET CONTROLLER FRAMEWORK
M: Philipp Zabel <p.zabel@pengutronix.de>
S: Maintained
M: Łukasz Stelmach <l.stelmach@samsung.com>
L: linux-samsung-soc@vger.kernel.org
S: Maintained
-F: Documentation/devicetree/bindings/rng/samsung,exynos5250-trng.txt
+F: Documentation/devicetree/bindings/rng/samsung,exynos5250-trng.yaml
F: drivers/char/hw_random/exynos-trng.c
SAMSUNG FRAMEBUFFER DRIVER
F: drivers/phy/samsung/phy-samsung-usb2.c
F: drivers/phy/samsung/phy-samsung-usb2.h
+SANCLOUD BEAGLEBONE ENHANCED DEVICE TREE
+M: Paul Barker <paul.barker@sancloud.com>
+R: Marc Murphy <marc.murphy@sancloud.com>
+S: Supported
+F: arch/arm/boot/dts/am335x-sancloud*
+
SC1200 WDT DRIVER
M: Zwane Mwaikambo <zwanem@gmail.com>
S: Maintained
F: drivers/iio/chemical/scd30_i2c.c
F: drivers/iio/chemical/scd30_serial.c
+SENSIRION SGP40 GAS SENSOR DRIVER
+M: Andreas Klinger <ak@it-klinger.de>
+S: Maintained
+F: Documentation/ABI/testing/sysfs-bus-iio-chemical-sgp40
+F: drivers/iio/chemical/sgp40.c
+
SENSIRION SPS30 AIR POLLUTION SENSOR DRIVER
M: Tomasz Duszynski <tduszyns@gmail.com>
S: Maintained
F: Documentation/devicetree/bindings/media/i2c/sony,imx334.yaml
F: drivers/media/i2c/imx334.c
+SONY IMX335 SENSOR DRIVER
+M: Paul J. Murphy <paul.j.murphy@intel.com>
+M: Daniele Alessandrelli <daniele.alessandrelli@intel.com>
+L: linux-media@vger.kernel.org
+S: Maintained
+T: git git://linuxtv.org/media_tree.git
+F: Documentation/devicetree/bindings/media/i2c/sony,imx335.yaml
+F: drivers/media/i2c/imx335.c
+
SONY IMX355 SENSOR DRIVER
M: Tianshu Qiu <tian.shu.qiu@intel.com>
L: linux-media@vger.kernel.org
T: git git://linuxtv.org/media_tree.git
F: drivers/media/i2c/imx355.c
+SONY IMX412 SENSOR DRIVER
+M: Paul J. Murphy <paul.j.murphy@intel.com>
+M: Daniele Alessandrelli <daniele.alessandrelli@intel.com>
+L: linux-media@vger.kernel.org
+S: Maintained
+T: git git://linuxtv.org/media_tree.git
+F: Documentation/devicetree/bindings/media/i2c/sony,imx412.yaml
+F: drivers/media/i2c/imx412.c
+
SONY MEMORYSTICK SUBSYSTEM
M: Maxim Levitsky <maximlevitsky@gmail.com>
M: Alex Dubov <oakad@yahoo.com>
STAGING - REALTEK RTL8188EU DRIVERS
M: Larry Finger <Larry.Finger@lwfinger.net>
-S: Odd Fixes
-F: drivers/staging/rtl8188eu/
+M: Phillip Potter <phil@philpotter.co.uk>
+S: Supported
+F: drivers/staging/r8188eu/
STAGING - REALTEK RTL8712U DRIVERS
M: Larry Finger <Larry.Finger@lwfinger.net>
F: include/uapi/linux/sync_file.h
SYNOPSYS ARC ARCHITECTURE
-M: Vineet Gupta <vgupta@synopsys.com>
+M: Vineet Gupta <vgupta@kernel.org>
L: linux-snps-arc@lists.infradead.org
S: Supported
T: git git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc.git
F: drivers/reset/reset-scmi.c
F: include/linux/sc[mp]i_protocol.h
F: include/trace/events/scmi.h
+F: include/uapi/linux/virtio_scmi.h
SYSTEM RESET/SHUTDOWN DRIVERS
M: Sebastian Reichel <sre@kernel.org>
F: include/linux/mmiotrace.h
F: kernel/trace/trace_mmiotrace.c
+TRADITIONAL CHINESE DOCUMENTATION
+M: Hu Haowen <src.res@email.cn>
+L: linux-doc-tw-discuss@lists.sourceforge.net
+S: Maintained
+W: https://github.com/srcres258/linux-doc
+T: git git://github.com/srcres258/linux-doc.git doc-zh-tw
+F: Documentation/translations/zh_TW/
+
TRIVIAL PATCHES
M: Jiri Kosina <trivial@kernel.org>
S: Maintained
F: Documentation/driver-api/vfio.rst
F: drivers/vfio/
F: include/linux/vfio.h
+ F: include/linux/vfio_pci_core.h
F: include/uapi/linux/vfio.h
VFIO FSL-MC DRIVER
F: include/uapi/linux/virtio_snd.h
F: sound/virtio/*
+VIRTIO I2C DRIVER
+M: Jie Deng <jie.deng@intel.com>
+M: Viresh Kumar <viresh.kumar@linaro.org>
+L: linux-i2c@vger.kernel.org
+L: virtualization@lists.linux-foundation.org
+S: Maintained
+F: drivers/i2c/busses/i2c-virtio.c
+F: include/uapi/linux/virtio_i2c.h
+
VIRTUAL BOX GUEST DEVICE DRIVER
M: Hans de Goede <hdegoede@redhat.com>
M: Arnd Bergmann <arnd@arndb.de>
F: Documentation/devicetree/bindings/mfd/wlf,arizona.yaml
F: Documentation/devicetree/bindings/mfd/wm831x.txt
F: Documentation/devicetree/bindings/regulator/wlf,arizona.yaml
-F: Documentation/devicetree/bindings/sound/wlf,arizona.yaml
+F: Documentation/devicetree/bindings/sound/wlf,*.yaml
+F: Documentation/devicetree/bindings/sound/wm*
F: Documentation/hwmon/wm83??.rst
F: arch/arm/mach-s3c/mach-crag6410*
F: drivers/clk/clk-wm83*.c
#define VFIO_AP_MDEV_TYPE_HWVIRT "passthrough"
#define VFIO_AP_MDEV_NAME_HWVIRT "VFIO AP Passthrough Device"
- static int vfio_ap_mdev_reset_queues(struct mdev_device *mdev);
+ static int vfio_ap_mdev_reset_queues(struct ap_matrix_mdev *matrix_mdev);
static struct vfio_ap_queue *vfio_ap_find_queue(int apqn);
+ static const struct vfio_device_ops vfio_ap_matrix_dev_ops;
static int match_apqn(struct device *dev, const void *data)
{
}
/**
- * vfio_ap_get_queue: Retrieve a queue with a specific APQN from a list
+ * vfio_ap_get_queue - retrieve a queue with a specific APQN from a list
* @matrix_mdev: the associated mediated matrix
* @apqn: The queue APQN
*
* devices of the vfio_ap_drv.
* Verify that the APID and the APQI are set in the matrix.
*
- * Returns the pointer to the associated vfio_ap_queue
+ * Return: the pointer to the associated vfio_ap_queue
*/
static struct vfio_ap_queue *vfio_ap_get_queue(
struct ap_matrix_mdev *matrix_mdev,
}
/**
- * vfio_ap_wait_for_irqclear
+ * vfio_ap_wait_for_irqclear - clears the IR bit or gives up after 5 tries
* @apqn: The AP Queue number
*
* Checks the IRQ bit for the status of this APQN using ap_tapq.
* Returns if ap_tapq function failed with invalid, deconfigured or
* checkstopped AP.
* Otherwise retries up to 5 times after waiting 20ms.
- *
*/
static void vfio_ap_wait_for_irqclear(int apqn)
{
}
/**
- * vfio_ap_free_aqic_resources
+ * vfio_ap_free_aqic_resources - free vfio_ap_queue resources
* @q: The vfio_ap_queue
*
* Unregisters the ISC in the GIB when the saved ISC not invalid.
- * Unpin the guest's page holding the NIB when it exist.
- * Reset the saved_pfn and saved_isc to invalid values.
- *
+ * Unpins the guest's page holding the NIB when it exists.
+ * Resets the saved_pfn and saved_isc to invalid values.
*/
static void vfio_ap_free_aqic_resources(struct vfio_ap_queue *q)
{
}
/**
- * vfio_ap_irq_disable
+ * vfio_ap_irq_disable - disables and clears an ap_queue interrupt
* @q: The vfio_ap_queue
*
* Uses ap_aqic to disable the interruption and in case of success, reset
*
* Returns if ap_aqic function failed with invalid, deconfigured or
* checkstopped AP.
+ *
+ * Return: &struct ap_queue_status
*/
static struct ap_queue_status vfio_ap_irq_disable(struct vfio_ap_queue *q)
{
}
/**
- * vfio_ap_setirq: Enable Interruption for a APQN
+ * vfio_ap_irq_enable - Enable Interruption for a APQN
*
- * @dev: the device associated with the ap_queue
* @q: the vfio_ap_queue holding AQIC parameters
*
* Pin the NIB saved in *q
*
* Otherwise return the ap_queue_status returned by the ap_aqic(),
* all retry handling will be done by the guest.
+ *
+ * Return: &struct ap_queue_status
*/
static struct ap_queue_status vfio_ap_irq_enable(struct vfio_ap_queue *q,
int isc,
}
/**
- * handle_pqap: PQAP instruction callback
+ * handle_pqap - PQAP instruction callback
*
* @vcpu: The vcpu on which we received the PQAP instruction
*
* We take the matrix_dev lock to ensure serialization on queues and
* mediated device access.
*
- * Return 0 if we could handle the request inside KVM.
- * otherwise, returns -EOPNOTSUPP to let QEMU handle the fault.
+ * Return: 0 if we could handle the request inside KVM.
+ * Otherwise, returns -EOPNOTSUPP to let QEMU handle the fault.
*/
static int handle_pqap(struct kvm_vcpu *vcpu)
{
matrix_mdev = container_of(vcpu->kvm->arch.crypto.pqap_hook,
struct ap_matrix_mdev, pqap_hook);
- /*
- * If the KVM pointer is in the process of being set, wait until the
- * process has completed.
- */
- wait_event_cmd(matrix_mdev->wait_for_kvm,
- !matrix_mdev->kvm_busy,
- mutex_unlock(&matrix_dev->lock),
- mutex_lock(&matrix_dev->lock));
-
/* If the there is no guest using the mdev, there is nothing to do */
if (!matrix_mdev->kvm)
goto out_unlock;
matrix->adm_max = info->apxa ? info->Nd : 15;
}
- static int vfio_ap_mdev_create(struct mdev_device *mdev)
+ static int vfio_ap_mdev_probe(struct mdev_device *mdev)
{
struct ap_matrix_mdev *matrix_mdev;
+ int ret;
if ((atomic_dec_if_positive(&matrix_dev->available_instances) < 0))
return -EPERM;
matrix_mdev = kzalloc(sizeof(*matrix_mdev), GFP_KERNEL);
if (!matrix_mdev) {
- atomic_inc(&matrix_dev->available_instances);
- return -ENOMEM;
+ ret = -ENOMEM;
+ goto err_dec_available;
}
+ vfio_init_group_dev(&matrix_mdev->vdev, &mdev->dev,
+ &vfio_ap_matrix_dev_ops);
matrix_mdev->mdev = mdev;
vfio_ap_matrix_init(&matrix_dev->info, &matrix_mdev->matrix);
- init_waitqueue_head(&matrix_mdev->wait_for_kvm);
- mdev_set_drvdata(mdev, matrix_mdev);
- matrix_mdev->pqap_hook.hook = handle_pqap;
- matrix_mdev->pqap_hook.owner = THIS_MODULE;
+ matrix_mdev->pqap_hook = handle_pqap;
mutex_lock(&matrix_dev->lock);
list_add(&matrix_mdev->node, &matrix_dev->mdev_list);
mutex_unlock(&matrix_dev->lock);
+ ret = vfio_register_group_dev(&matrix_mdev->vdev);
+ if (ret)
+ goto err_list;
+ dev_set_drvdata(&mdev->dev, matrix_mdev);
return 0;
+
+ err_list:
+ mutex_lock(&matrix_dev->lock);
+ list_del(&matrix_mdev->node);
+ mutex_unlock(&matrix_dev->lock);
+ kfree(matrix_mdev);
+ err_dec_available:
+ atomic_inc(&matrix_dev->available_instances);
+ return ret;
}
- static int vfio_ap_mdev_remove(struct mdev_device *mdev)
+ static void vfio_ap_mdev_remove(struct mdev_device *mdev)
{
- struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
+ struct ap_matrix_mdev *matrix_mdev = dev_get_drvdata(&mdev->dev);
+
+ vfio_unregister_group_dev(&matrix_mdev->vdev);
mutex_lock(&matrix_dev->lock);
- vfio_ap_mdev_reset_queues(mdev);
+ vfio_ap_mdev_reset_queues(matrix_mdev);
list_del(&matrix_mdev->node);
kfree(matrix_mdev);
- mdev_set_drvdata(mdev, NULL);
atomic_inc(&matrix_dev->available_instances);
mutex_unlock(&matrix_dev->lock);
-
- return 0;
}
static ssize_t name_show(struct mdev_type *mtype,
};
/**
- * vfio_ap_has_queue
+ * vfio_ap_has_queue - determines if the AP queue containing the target in @data
*
* @dev: an AP queue device
* @data: a struct vfio_ap_queue_reserved reference
* - If @data contains only an apqi value, @data will be flagged as
* reserved if the APQI field in the AP queue device matches
*
- * Returns 0 to indicate the input to function succeeded. Returns -EINVAL if
+ * Return: 0 to indicate the input to function succeeded. Returns -EINVAL if
* @data does not contain either an apid or apqi.
*/
static int vfio_ap_has_queue(struct device *dev, void *data)
}
/**
- * vfio_ap_verify_queue_reserved
+ * vfio_ap_verify_queue_reserved - verifies that the AP queue containing
+ * @apid or @aqpi is reserved
*
- * @matrix_dev: a mediated matrix device
* @apid: an AP adapter ID
* @apqi: an AP queue index
*
* - If only @apqi is not NULL, then there must be an AP queue device bound
* to the vfio_ap driver with an APQN containing @apqi
*
- * Returns 0 if the AP queue is reserved; otherwise, returns -EADDRNOTAVAIL.
+ * Return: 0 if the AP queue is reserved; otherwise, returns -EADDRNOTAVAIL.
*/
static int vfio_ap_verify_queue_reserved(unsigned long *apid,
unsigned long *apqi)
}
/**
- * vfio_ap_mdev_verify_no_sharing
+ * vfio_ap_mdev_verify_no_sharing - verifies that the AP matrix is not configured
+ *
+ * @matrix_mdev: the mediated matrix device
*
* Verifies that the APQNs derived from the cross product of the AP adapter IDs
* and AP queue indexes comprising the AP matrix are not configured for another
* mediated device. AP queue sharing is not allowed.
*
- * @matrix_mdev: the mediated matrix device
- *
- * Returns 0 if the APQNs are not shared, otherwise; returns -EADDRINUSE.
+ * Return: 0 if the APQNs are not shared; otherwise returns -EADDRINUSE.
*/
static int vfio_ap_mdev_verify_no_sharing(struct ap_matrix_mdev *matrix_mdev)
{
}
/**
- * assign_adapter_store
+ * assign_adapter_store - parses the APID from @buf and sets the
+ * corresponding bit in the mediated matrix device's APM
*
* @dev: the matrix device
* @attr: the mediated matrix device's assign_adapter attribute
* be assigned
* @count: the number of bytes in @buf
*
- * Parses the APID from @buf and sets the corresponding bit in the mediated
- * matrix device's APM.
- *
- * Returns the number of bytes processed if the APID is valid; otherwise,
+ * Return: the number of bytes processed if the APID is valid; otherwise,
* returns one of the following errors:
*
* 1. -EINVAL
{
int ret;
unsigned long apid;
- struct mdev_device *mdev = mdev_from_dev(dev);
- struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
+ struct ap_matrix_mdev *matrix_mdev = dev_get_drvdata(dev);
mutex_lock(&matrix_dev->lock);
- /*
- * If the KVM pointer is in flux or the guest is running, disallow
- * un-assignment of adapter
- */
- if (matrix_mdev->kvm_busy || matrix_mdev->kvm) {
+ /* If the KVM guest is running, disallow assignment of adapter */
+ if (matrix_mdev->kvm) {
ret = -EBUSY;
goto done;
}
static DEVICE_ATTR_WO(assign_adapter);
/**
- * unassign_adapter_store
+ * unassign_adapter_store - parses the APID from @buf and clears the
+ * corresponding bit in the mediated matrix device's APM
*
* @dev: the matrix device
* @attr: the mediated matrix device's unassign_adapter attribute
* @buf: a buffer containing the adapter number (APID) to be unassigned
* @count: the number of bytes in @buf
*
- * Parses the APID from @buf and clears the corresponding bit in the mediated
- * matrix device's APM.
- *
- * Returns the number of bytes processed if the APID is valid; otherwise,
+ * Return: the number of bytes processed if the APID is valid; otherwise,
* returns one of the following errors:
* -EINVAL if the APID is not a number
* -ENODEV if the APID it exceeds the maximum value configured for the
{
int ret;
unsigned long apid;
- struct mdev_device *mdev = mdev_from_dev(dev);
- struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
+ struct ap_matrix_mdev *matrix_mdev = dev_get_drvdata(dev);
mutex_lock(&matrix_dev->lock);
- /*
- * If the KVM pointer is in flux or the guest is running, disallow
- * un-assignment of adapter
- */
- if (matrix_mdev->kvm_busy || matrix_mdev->kvm) {
+ /* If the KVM guest is running, disallow unassignment of adapter */
+ if (matrix_mdev->kvm) {
ret = -EBUSY;
goto done;
}
}
/**
- * assign_domain_store
+ * assign_domain_store - parses the APQI from @buf and sets the
+ * corresponding bit in the mediated matrix device's AQM
+ *
*
* @dev: the matrix device
* @attr: the mediated matrix device's assign_domain attribute
* be assigned
* @count: the number of bytes in @buf
*
- * Parses the APQI from @buf and sets the corresponding bit in the mediated
- * matrix device's AQM.
- *
- * Returns the number of bytes processed if the APQI is valid; otherwise returns
+ * Return: the number of bytes processed if the APQI is valid; otherwise returns
* one of the following errors:
*
* 1. -EINVAL
{
int ret;
unsigned long apqi;
- struct mdev_device *mdev = mdev_from_dev(dev);
- struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
+ struct ap_matrix_mdev *matrix_mdev = dev_get_drvdata(dev);
unsigned long max_apqi = matrix_mdev->matrix.aqm_max;
mutex_lock(&matrix_dev->lock);
- /*
- * If the KVM pointer is in flux or the guest is running, disallow
- * assignment of domain
- */
- if (matrix_mdev->kvm_busy || matrix_mdev->kvm) {
+ /* If the KVM guest is running, disallow assignment of domain */
+ if (matrix_mdev->kvm) {
ret = -EBUSY;
goto done;
}
/**
- * unassign_domain_store
+ * unassign_domain_store - parses the APQI from @buf and clears the
+ * corresponding bit in the mediated matrix device's AQM
*
* @dev: the matrix device
* @attr: the mediated matrix device's unassign_domain attribute
* be unassigned
* @count: the number of bytes in @buf
*
- * Parses the APQI from @buf and clears the corresponding bit in the
- * mediated matrix device's AQM.
- *
- * Returns the number of bytes processed if the APQI is valid; otherwise,
+ * Return: the number of bytes processed if the APQI is valid; otherwise,
* returns one of the following errors:
* -EINVAL if the APQI is not a number
* -ENODEV if the APQI exceeds the maximum value configured for the system
{
int ret;
unsigned long apqi;
- struct mdev_device *mdev = mdev_from_dev(dev);
- struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
+ struct ap_matrix_mdev *matrix_mdev = dev_get_drvdata(dev);
mutex_lock(&matrix_dev->lock);
- /*
- * If the KVM pointer is in flux or the guest is running, disallow
- * un-assignment of domain
- */
- if (matrix_mdev->kvm_busy || matrix_mdev->kvm) {
+ /* If the KVM guest is running, disallow unassignment of domain */
+ if (matrix_mdev->kvm) {
ret = -EBUSY;
goto done;
}
static DEVICE_ATTR_WO(unassign_domain);
/**
- * assign_control_domain_store
+ * assign_control_domain_store - parses the domain ID from @buf and sets
+ * the corresponding bit in the mediated matrix device's ADM
+ *
*
* @dev: the matrix device
* @attr: the mediated matrix device's assign_control_domain attribute
* @buf: a buffer containing the domain ID to be assigned
* @count: the number of bytes in @buf
*
- * Parses the domain ID from @buf and sets the corresponding bit in the mediated
- * matrix device's ADM.
- *
- * Returns the number of bytes processed if the domain ID is valid; otherwise,
+ * Return: the number of bytes processed if the domain ID is valid; otherwise,
* returns one of the following errors:
* -EINVAL if the ID is not a number
* -ENODEV if the ID exceeds the maximum value configured for the system
{
int ret;
unsigned long id;
- struct mdev_device *mdev = mdev_from_dev(dev);
- struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
+ struct ap_matrix_mdev *matrix_mdev = dev_get_drvdata(dev);
mutex_lock(&matrix_dev->lock);
- /*
- * If the KVM pointer is in flux or the guest is running, disallow
- * assignment of control domain.
- */
- if (matrix_mdev->kvm_busy || matrix_mdev->kvm) {
+ /* If the KVM guest is running, disallow assignment of control domain */
+ if (matrix_mdev->kvm) {
ret = -EBUSY;
goto done;
}
static DEVICE_ATTR_WO(assign_control_domain);
/**
- * unassign_control_domain_store
+ * unassign_control_domain_store - parses the domain ID from @buf and
+ * clears the corresponding bit in the mediated matrix device's ADM
*
* @dev: the matrix device
* @attr: the mediated matrix device's unassign_control_domain attribute
* @buf: a buffer containing the domain ID to be unassigned
* @count: the number of bytes in @buf
*
- * Parses the domain ID from @buf and clears the corresponding bit in the
- * mediated matrix device's ADM.
- *
- * Returns the number of bytes processed if the domain ID is valid; otherwise,
+ * Return: the number of bytes processed if the domain ID is valid; otherwise,
* returns one of the following errors:
* -EINVAL if the ID is not a number
* -ENODEV if the ID exceeds the maximum value configured for the system
{
int ret;
unsigned long domid;
- struct mdev_device *mdev = mdev_from_dev(dev);
- struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
+ struct ap_matrix_mdev *matrix_mdev = dev_get_drvdata(dev);
unsigned long max_domid = matrix_mdev->matrix.adm_max;
mutex_lock(&matrix_dev->lock);
- /*
- * If the KVM pointer is in flux or the guest is running, disallow
- * un-assignment of control domain.
- */
- if (matrix_mdev->kvm_busy || matrix_mdev->kvm) {
+ /* If a KVM guest is running, disallow unassignment of control domain */
+ if (matrix_mdev->kvm) {
ret = -EBUSY;
goto done;
}
int nchars = 0;
int n;
char *bufpos = buf;
- struct mdev_device *mdev = mdev_from_dev(dev);
- struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
+ struct ap_matrix_mdev *matrix_mdev = dev_get_drvdata(dev);
unsigned long max_domid = matrix_mdev->matrix.adm_max;
mutex_lock(&matrix_dev->lock);
static ssize_t matrix_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
- struct mdev_device *mdev = mdev_from_dev(dev);
- struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
+ struct ap_matrix_mdev *matrix_mdev = dev_get_drvdata(dev);
char *bufpos = buf;
unsigned long apid;
unsigned long apqi;
};
/**
- * vfio_ap_mdev_set_kvm
+ * vfio_ap_mdev_set_kvm - sets all data for @matrix_mdev that are needed
+ * to manage AP resources for the guest whose state is represented by @kvm
*
* @matrix_mdev: a mediated matrix device
* @kvm: reference to KVM instance
*
- * Sets all data for @matrix_mdev that are needed to manage AP resources
- * for the guest whose state is represented by @kvm.
- *
* Note: The matrix_dev->lock must be taken prior to calling
* this function; however, the lock will be temporarily released while the
* guest's AP configuration is set to avoid a potential lockdep splat.
* certain circumstances, will result in a circular lock dependency if this is
* done under the @matrix_mdev->lock.
*
- * Return 0 if no other mediated matrix device has a reference to @kvm;
+ * Return: 0 if no other mediated matrix device has a reference to @kvm;
* otherwise, returns an -EPERM.
*/
static int vfio_ap_mdev_set_kvm(struct ap_matrix_mdev *matrix_mdev,
struct ap_matrix_mdev *m;
if (kvm->arch.crypto.crycbd) {
+ down_write(&kvm->arch.crypto.pqap_hook_rwsem);
+ kvm->arch.crypto.pqap_hook = &matrix_mdev->pqap_hook;
+ up_write(&kvm->arch.crypto.pqap_hook_rwsem);
+
+ mutex_lock(&kvm->lock);
+ mutex_lock(&matrix_dev->lock);
+
list_for_each_entry(m, &matrix_dev->mdev_list, node) {
- if (m != matrix_mdev && m->kvm == kvm)
+ if (m != matrix_mdev && m->kvm == kvm) {
+ mutex_unlock(&kvm->lock);
+ mutex_unlock(&matrix_dev->lock);
return -EPERM;
+ }
}
kvm_get_kvm(kvm);
- matrix_mdev->kvm_busy = true;
- mutex_unlock(&matrix_dev->lock);
+ matrix_mdev->kvm = kvm;
kvm_arch_crypto_set_masks(kvm,
matrix_mdev->matrix.apm,
matrix_mdev->matrix.aqm,
matrix_mdev->matrix.adm);
- mutex_lock(&matrix_dev->lock);
- kvm->arch.crypto.pqap_hook = &matrix_mdev->pqap_hook;
- matrix_mdev->kvm = kvm;
- matrix_mdev->kvm_busy = false;
- wake_up_all(&matrix_mdev->wait_for_kvm);
+
+ mutex_unlock(&kvm->lock);
+ mutex_unlock(&matrix_dev->lock);
}
return 0;
}
-/*
- * vfio_ap_mdev_iommu_notifier: IOMMU notifier callback
+/**
+ * vfio_ap_mdev_iommu_notifier - IOMMU notifier callback
*
* @nb: The notifier block
* @action: Action to be taken
* For an UNMAP request, unpin the guest IOVA (the NIB guest address we
* pinned before). Other requests are ignored.
*
+ * Return: for an UNMAP request, NOFITY_OK; otherwise NOTIFY_DONE.
*/
static int vfio_ap_mdev_iommu_notifier(struct notifier_block *nb,
unsigned long action, void *data)
}
/**
- * vfio_ap_mdev_unset_kvm
+ * vfio_ap_mdev_unset_kvm - performs clean-up of resources no longer needed
+ * by @matrix_mdev.
*
* @matrix_mdev: a matrix mediated device
*
- * Performs clean-up of resources no longer needed by @matrix_mdev.
- *
* Note: The matrix_dev->lock must be taken prior to calling
* this function; however, the lock will be temporarily released while the
* guest's AP configuration is cleared to avoid a potential lockdep splat.
* The kvm->lock is taken to clear the guest's AP configuration which, under
* certain circumstances, will result in a circular lock dependency if this is
* done under the @matrix_mdev->lock.
- *
*/
- static void vfio_ap_mdev_unset_kvm(struct ap_matrix_mdev *matrix_mdev)
+ static void vfio_ap_mdev_unset_kvm(struct ap_matrix_mdev *matrix_mdev,
+ struct kvm *kvm)
{
- /*
- * If the KVM pointer is in the process of being set, wait until the
- * process has completed.
- */
- wait_event_cmd(matrix_mdev->wait_for_kvm,
- !matrix_mdev->kvm_busy,
- mutex_unlock(&matrix_dev->lock),
- mutex_lock(&matrix_dev->lock));
+ if (kvm && kvm->arch.crypto.crycbd) {
+ down_write(&kvm->arch.crypto.pqap_hook_rwsem);
+ kvm->arch.crypto.pqap_hook = NULL;
+ up_write(&kvm->arch.crypto.pqap_hook_rwsem);
- if (matrix_mdev->kvm) {
- matrix_mdev->kvm_busy = true;
- mutex_unlock(&matrix_dev->lock);
- kvm_arch_crypto_clear_masks(matrix_mdev->kvm);
+ mutex_lock(&kvm->lock);
mutex_lock(&matrix_dev->lock);
- vfio_ap_mdev_reset_queues(matrix_mdev->mdev);
- matrix_mdev->kvm->arch.crypto.pqap_hook = NULL;
- kvm_put_kvm(matrix_mdev->kvm);
+
+ kvm_arch_crypto_clear_masks(kvm);
+ vfio_ap_mdev_reset_queues(matrix_mdev);
+ kvm_put_kvm(kvm);
matrix_mdev->kvm = NULL;
- matrix_mdev->kvm_busy = false;
- wake_up_all(&matrix_mdev->wait_for_kvm);
+
+ mutex_unlock(&kvm->lock);
+ mutex_unlock(&matrix_dev->lock);
}
}
if (action != VFIO_GROUP_NOTIFY_SET_KVM)
return NOTIFY_OK;
- mutex_lock(&matrix_dev->lock);
matrix_mdev = container_of(nb, struct ap_matrix_mdev, group_notifier);
if (!data)
- vfio_ap_mdev_unset_kvm(matrix_mdev);
+ vfio_ap_mdev_unset_kvm(matrix_mdev, matrix_mdev->kvm);
else if (vfio_ap_mdev_set_kvm(matrix_mdev, data))
notify_rc = NOTIFY_DONE;
- mutex_unlock(&matrix_dev->lock);
-
return notify_rc;
}
return ret;
}
- static int vfio_ap_mdev_reset_queues(struct mdev_device *mdev)
+ static int vfio_ap_mdev_reset_queues(struct ap_matrix_mdev *matrix_mdev)
{
int ret;
int rc = 0;
unsigned long apid, apqi;
struct vfio_ap_queue *q;
- struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
for_each_set_bit_inv(apid, matrix_mdev->matrix.apm,
matrix_mdev->matrix.apm_max + 1) {
return rc;
}
- static int vfio_ap_mdev_open(struct mdev_device *mdev)
+ static int vfio_ap_mdev_open_device(struct vfio_device *vdev)
{
- struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
+ struct ap_matrix_mdev *matrix_mdev =
+ container_of(vdev, struct ap_matrix_mdev, vdev);
unsigned long events;
int ret;
-
- if (!try_module_get(THIS_MODULE))
- return -ENODEV;
-
matrix_mdev->group_notifier.notifier_call = vfio_ap_mdev_group_notifier;
events = VFIO_GROUP_NOTIFY_SET_KVM;
- ret = vfio_register_notifier(mdev_dev(mdev), VFIO_GROUP_NOTIFY,
+ ret = vfio_register_notifier(vdev->dev, VFIO_GROUP_NOTIFY,
&events, &matrix_mdev->group_notifier);
- if (ret) {
- module_put(THIS_MODULE);
+ if (ret)
return ret;
- }
matrix_mdev->iommu_notifier.notifier_call = vfio_ap_mdev_iommu_notifier;
events = VFIO_IOMMU_NOTIFY_DMA_UNMAP;
- ret = vfio_register_notifier(mdev_dev(mdev), VFIO_IOMMU_NOTIFY,
+ ret = vfio_register_notifier(vdev->dev, VFIO_IOMMU_NOTIFY,
&events, &matrix_mdev->iommu_notifier);
- if (!ret)
- return ret;
+ if (ret)
+ goto out_unregister_group;
+ return 0;
- vfio_unregister_notifier(mdev_dev(mdev), VFIO_GROUP_NOTIFY,
+ out_unregister_group:
+ vfio_unregister_notifier(vdev->dev, VFIO_GROUP_NOTIFY,
&matrix_mdev->group_notifier);
- module_put(THIS_MODULE);
return ret;
}
- static void vfio_ap_mdev_release(struct mdev_device *mdev)
+ static void vfio_ap_mdev_close_device(struct vfio_device *vdev)
{
- struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
-
- mutex_lock(&matrix_dev->lock);
- vfio_ap_mdev_unset_kvm(matrix_mdev);
- mutex_unlock(&matrix_dev->lock);
+ struct ap_matrix_mdev *matrix_mdev =
+ container_of(vdev, struct ap_matrix_mdev, vdev);
- vfio_unregister_notifier(mdev_dev(mdev), VFIO_IOMMU_NOTIFY,
+ vfio_unregister_notifier(vdev->dev, VFIO_IOMMU_NOTIFY,
&matrix_mdev->iommu_notifier);
- vfio_unregister_notifier(mdev_dev(mdev), VFIO_GROUP_NOTIFY,
+ vfio_unregister_notifier(vdev->dev, VFIO_GROUP_NOTIFY,
&matrix_mdev->group_notifier);
- module_put(THIS_MODULE);
+ vfio_ap_mdev_unset_kvm(matrix_mdev, matrix_mdev->kvm);
}
static int vfio_ap_mdev_get_device_info(unsigned long arg)
return copy_to_user((void __user *)arg, &info, minsz) ? -EFAULT : 0;
}
- static ssize_t vfio_ap_mdev_ioctl(struct mdev_device *mdev,
+ static ssize_t vfio_ap_mdev_ioctl(struct vfio_device *vdev,
unsigned int cmd, unsigned long arg)
{
+ struct ap_matrix_mdev *matrix_mdev =
+ container_of(vdev, struct ap_matrix_mdev, vdev);
int ret;
- struct ap_matrix_mdev *matrix_mdev;
mutex_lock(&matrix_dev->lock);
switch (cmd) {
ret = vfio_ap_mdev_get_device_info(arg);
break;
case VFIO_DEVICE_RESET:
- matrix_mdev = mdev_get_drvdata(mdev);
- if (WARN(!matrix_mdev, "Driver data missing from mdev!!")) {
- ret = -EINVAL;
- break;
- }
-
- /*
- * If the KVM pointer is in the process of being set, wait until
- * the process has completed.
- */
- wait_event_cmd(matrix_mdev->wait_for_kvm,
- !matrix_mdev->kvm_busy,
- mutex_unlock(&matrix_dev->lock),
- mutex_lock(&matrix_dev->lock));
-
- ret = vfio_ap_mdev_reset_queues(mdev);
+ ret = vfio_ap_mdev_reset_queues(matrix_mdev);
break;
default:
ret = -EOPNOTSUPP;
return ret;
}
+ static const struct vfio_device_ops vfio_ap_matrix_dev_ops = {
+ .open_device = vfio_ap_mdev_open_device,
+ .close_device = vfio_ap_mdev_close_device,
+ .ioctl = vfio_ap_mdev_ioctl,
+ };
+
+ static struct mdev_driver vfio_ap_matrix_driver = {
+ .driver = {
+ .name = "vfio_ap_mdev",
+ .owner = THIS_MODULE,
+ .mod_name = KBUILD_MODNAME,
+ .dev_groups = vfio_ap_mdev_attr_groups,
+ },
+ .probe = vfio_ap_mdev_probe,
+ .remove = vfio_ap_mdev_remove,
+ };
+
static const struct mdev_parent_ops vfio_ap_matrix_ops = {
.owner = THIS_MODULE,
+ .device_driver = &vfio_ap_matrix_driver,
.supported_type_groups = vfio_ap_mdev_type_groups,
- .mdev_attr_groups = vfio_ap_mdev_attr_groups,
- .create = vfio_ap_mdev_create,
- .remove = vfio_ap_mdev_remove,
- .open = vfio_ap_mdev_open,
- .release = vfio_ap_mdev_release,
- .ioctl = vfio_ap_mdev_ioctl,
};
int vfio_ap_mdev_register(void)
{
+ int ret;
+
atomic_set(&matrix_dev->available_instances, MAX_ZDEV_ENTRIES_EXT);
- return mdev_register_device(&matrix_dev->device, &vfio_ap_matrix_ops);
+ ret = mdev_register_driver(&vfio_ap_matrix_driver);
+ if (ret)
+ return ret;
+
+ ret = mdev_register_device(&matrix_dev->device, &vfio_ap_matrix_ops);
+ if (ret)
+ goto err_driver;
+ return 0;
+
+ err_driver:
+ mdev_unregister_driver(&vfio_ap_matrix_driver);
+ return ret;
}
void vfio_ap_mdev_unregister(void)
{
mdev_unregister_device(&matrix_dev->device);
+ mdev_unregister_driver(&vfio_ap_matrix_driver);
}
--- /dev/null
-static unsigned int vfio_pci_set_vga_decode(void *opaque, bool single_vga)
+ // SPDX-License-Identifier: GPL-2.0-only
+ /*
+ * Copyright (C) 2012 Red Hat, Inc. All rights reserved.
+ * Author: Alex Williamson <alex.williamson@redhat.com>
+ *
+ * Derived from original vfio:
+ * Copyright 2010 Cisco Systems, Inc. All rights reserved.
+ * Author: Tom Lyon, pugs@cisco.com
+ */
+
+ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+ #include <linux/device.h>
+ #include <linux/eventfd.h>
+ #include <linux/file.h>
+ #include <linux/interrupt.h>
+ #include <linux/iommu.h>
+ #include <linux/module.h>
+ #include <linux/mutex.h>
+ #include <linux/notifier.h>
+ #include <linux/pci.h>
+ #include <linux/pm_runtime.h>
+ #include <linux/slab.h>
+ #include <linux/types.h>
+ #include <linux/uaccess.h>
+ #include <linux/vgaarb.h>
+ #include <linux/nospec.h>
+ #include <linux/sched/mm.h>
+
+ #include <linux/vfio_pci_core.h>
+
+ #define DRIVER_AUTHOR "Alex Williamson <alex.williamson@redhat.com>"
+ #define DRIVER_DESC "core driver for VFIO based PCI devices"
+
+ static bool nointxmask;
+ static bool disable_vga;
+ static bool disable_idle_d3;
+
+ static inline bool vfio_vga_disabled(void)
+ {
+ #ifdef CONFIG_VFIO_PCI_VGA
+ return disable_vga;
+ #else
+ return true;
+ #endif
+ }
+
+ /*
+ * Our VGA arbiter participation is limited since we don't know anything
+ * about the device itself. However, if the device is the only VGA device
+ * downstream of a bridge and VFIO VGA support is disabled, then we can
+ * safely return legacy VGA IO and memory as not decoded since the user
+ * has no way to get to it and routing can be disabled externally at the
+ * bridge.
+ */
- struct vfio_pci_core_device *vdev = opaque;
- struct pci_dev *tmp = NULL, *pdev = vdev->pdev;
++static unsigned int vfio_pci_set_decode(struct pci_dev *pdev, bool single_vga)
+ {
- ret = vga_client_register(pdev, vdev, NULL, vfio_pci_set_vga_decode);
++ struct pci_dev *tmp = NULL;
+ unsigned char max_busnr;
+ unsigned int decodes;
+
+ if (single_vga || !vfio_vga_disabled() || pci_is_root_bus(pdev->bus))
+ return VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM |
+ VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM;
+
+ max_busnr = pci_bus_max_busnr(pdev->bus);
+ decodes = VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
+
+ while ((tmp = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, tmp)) != NULL) {
+ if (tmp == pdev ||
+ pci_domain_nr(tmp->bus) != pci_domain_nr(pdev->bus) ||
+ pci_is_root_bus(tmp->bus))
+ continue;
+
+ if (tmp->bus->number >= pdev->bus->number &&
+ tmp->bus->number <= max_busnr) {
+ pci_dev_put(tmp);
+ decodes |= VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM;
+ break;
+ }
+ }
+
+ return decodes;
+ }
+
+ static void vfio_pci_probe_mmaps(struct vfio_pci_core_device *vdev)
+ {
+ struct resource *res;
+ int i;
+ struct vfio_pci_dummy_resource *dummy_res;
+
+ for (i = 0; i < PCI_STD_NUM_BARS; i++) {
+ int bar = i + PCI_STD_RESOURCES;
+
+ res = &vdev->pdev->resource[bar];
+
+ if (!IS_ENABLED(CONFIG_VFIO_PCI_MMAP))
+ goto no_mmap;
+
+ if (!(res->flags & IORESOURCE_MEM))
+ goto no_mmap;
+
+ /*
+ * The PCI core shouldn't set up a resource with a
+ * type but zero size. But there may be bugs that
+ * cause us to do that.
+ */
+ if (!resource_size(res))
+ goto no_mmap;
+
+ if (resource_size(res) >= PAGE_SIZE) {
+ vdev->bar_mmap_supported[bar] = true;
+ continue;
+ }
+
+ if (!(res->start & ~PAGE_MASK)) {
+ /*
+ * Add a dummy resource to reserve the remainder
+ * of the exclusive page in case that hot-add
+ * device's bar is assigned into it.
+ */
+ dummy_res = kzalloc(sizeof(*dummy_res), GFP_KERNEL);
+ if (dummy_res == NULL)
+ goto no_mmap;
+
+ dummy_res->resource.name = "vfio sub-page reserved";
+ dummy_res->resource.start = res->end + 1;
+ dummy_res->resource.end = res->start + PAGE_SIZE - 1;
+ dummy_res->resource.flags = res->flags;
+ if (request_resource(res->parent,
+ &dummy_res->resource)) {
+ kfree(dummy_res);
+ goto no_mmap;
+ }
+ dummy_res->index = bar;
+ list_add(&dummy_res->res_next,
+ &vdev->dummy_resources_list);
+ vdev->bar_mmap_supported[bar] = true;
+ continue;
+ }
+ /*
+ * Here we don't handle the case when the BAR is not page
+ * aligned because we can't expect the BAR will be
+ * assigned into the same location in a page in guest
+ * when we passthrough the BAR. And it's hard to access
+ * this BAR in userspace because we have no way to get
+ * the BAR's location in a page.
+ */
+ no_mmap:
+ vdev->bar_mmap_supported[bar] = false;
+ }
+ }
+
+ struct vfio_pci_group_info;
+ static bool vfio_pci_dev_set_try_reset(struct vfio_device_set *dev_set);
+ static int vfio_pci_dev_set_hot_reset(struct vfio_device_set *dev_set,
+ struct vfio_pci_group_info *groups);
+
+ /*
+ * INTx masking requires the ability to disable INTx signaling via PCI_COMMAND
+ * _and_ the ability detect when the device is asserting INTx via PCI_STATUS.
+ * If a device implements the former but not the latter we would typically
+ * expect broken_intx_masking be set and require an exclusive interrupt.
+ * However since we do have control of the device's ability to assert INTx,
+ * we can instead pretend that the device does not implement INTx, virtualizing
+ * the pin register to report zero and maintaining DisINTx set on the host.
+ */
+ static bool vfio_pci_nointx(struct pci_dev *pdev)
+ {
+ switch (pdev->vendor) {
+ case PCI_VENDOR_ID_INTEL:
+ switch (pdev->device) {
+ /* All i40e (XL710/X710/XXV710) 10/20/25/40GbE NICs */
+ case 0x1572:
+ case 0x1574:
+ case 0x1580 ... 0x1581:
+ case 0x1583 ... 0x158b:
+ case 0x37d0 ... 0x37d2:
+ /* X550 */
+ case 0x1563:
+ return true;
+ default:
+ return false;
+ }
+ }
+
+ return false;
+ }
+
+ static void vfio_pci_probe_power_state(struct vfio_pci_core_device *vdev)
+ {
+ struct pci_dev *pdev = vdev->pdev;
+ u16 pmcsr;
+
+ if (!pdev->pm_cap)
+ return;
+
+ pci_read_config_word(pdev, pdev->pm_cap + PCI_PM_CTRL, &pmcsr);
+
+ vdev->needs_pm_restore = !(pmcsr & PCI_PM_CTRL_NO_SOFT_RESET);
+ }
+
+ /*
+ * pci_set_power_state() wrapper handling devices which perform a soft reset on
+ * D3->D0 transition. Save state prior to D0/1/2->D3, stash it on the vdev,
+ * restore when returned to D0. Saved separately from pci_saved_state for use
+ * by PM capability emulation and separately from pci_dev internal saved state
+ * to avoid it being overwritten and consumed around other resets.
+ */
+ int vfio_pci_set_power_state(struct vfio_pci_core_device *vdev, pci_power_t state)
+ {
+ struct pci_dev *pdev = vdev->pdev;
+ bool needs_restore = false, needs_save = false;
+ int ret;
+
+ if (vdev->needs_pm_restore) {
+ if (pdev->current_state < PCI_D3hot && state >= PCI_D3hot) {
+ pci_save_state(pdev);
+ needs_save = true;
+ }
+
+ if (pdev->current_state >= PCI_D3hot && state <= PCI_D0)
+ needs_restore = true;
+ }
+
+ ret = pci_set_power_state(pdev, state);
+
+ if (!ret) {
+ /* D3 might be unsupported via quirk, skip unless in D3 */
+ if (needs_save && pdev->current_state >= PCI_D3hot) {
+ vdev->pm_save = pci_store_saved_state(pdev);
+ } else if (needs_restore) {
+ pci_load_and_free_saved_state(pdev, &vdev->pm_save);
+ pci_restore_state(pdev);
+ }
+ }
+
+ return ret;
+ }
+
+ int vfio_pci_core_enable(struct vfio_pci_core_device *vdev)
+ {
+ struct pci_dev *pdev = vdev->pdev;
+ int ret;
+ u16 cmd;
+ u8 msix_pos;
+
+ vfio_pci_set_power_state(vdev, PCI_D0);
+
+ /* Don't allow our initial saved state to include busmaster */
+ pci_clear_master(pdev);
+
+ ret = pci_enable_device(pdev);
+ if (ret)
+ return ret;
+
+ /* If reset fails because of the device lock, fail this path entirely */
+ ret = pci_try_reset_function(pdev);
+ if (ret == -EAGAIN) {
+ pci_disable_device(pdev);
+ return ret;
+ }
+
+ vdev->reset_works = !ret;
+ pci_save_state(pdev);
+ vdev->pci_saved_state = pci_store_saved_state(pdev);
+ if (!vdev->pci_saved_state)
+ pci_dbg(pdev, "%s: Couldn't store saved state\n", __func__);
+
+ if (likely(!nointxmask)) {
+ if (vfio_pci_nointx(pdev)) {
+ pci_info(pdev, "Masking broken INTx support\n");
+ vdev->nointx = true;
+ pci_intx(pdev, 0);
+ } else
+ vdev->pci_2_3 = pci_intx_mask_supported(pdev);
+ }
+
+ pci_read_config_word(pdev, PCI_COMMAND, &cmd);
+ if (vdev->pci_2_3 && (cmd & PCI_COMMAND_INTX_DISABLE)) {
+ cmd &= ~PCI_COMMAND_INTX_DISABLE;
+ pci_write_config_word(pdev, PCI_COMMAND, cmd);
+ }
+
+ ret = vfio_config_init(vdev);
+ if (ret) {
+ kfree(vdev->pci_saved_state);
+ vdev->pci_saved_state = NULL;
+ pci_disable_device(pdev);
+ return ret;
+ }
+
+ msix_pos = pdev->msix_cap;
+ if (msix_pos) {
+ u16 flags;
+ u32 table;
+
+ pci_read_config_word(pdev, msix_pos + PCI_MSIX_FLAGS, &flags);
+ pci_read_config_dword(pdev, msix_pos + PCI_MSIX_TABLE, &table);
+
+ vdev->msix_bar = table & PCI_MSIX_TABLE_BIR;
+ vdev->msix_offset = table & PCI_MSIX_TABLE_OFFSET;
+ vdev->msix_size = ((flags & PCI_MSIX_FLAGS_QSIZE) + 1) * 16;
+ } else
+ vdev->msix_bar = 0xFF;
+
+ if (!vfio_vga_disabled() && vfio_pci_is_vga(pdev))
+ vdev->has_vga = true;
+
+
+ return 0;
+ }
+ EXPORT_SYMBOL_GPL(vfio_pci_core_enable);
+
+ void vfio_pci_core_disable(struct vfio_pci_core_device *vdev)
+ {
+ struct pci_dev *pdev = vdev->pdev;
+ struct vfio_pci_dummy_resource *dummy_res, *tmp;
+ struct vfio_pci_ioeventfd *ioeventfd, *ioeventfd_tmp;
+ int i, bar;
+
+ /* For needs_reset */
+ lockdep_assert_held(&vdev->vdev.dev_set->lock);
+
+ /* Stop the device from further DMA */
+ pci_clear_master(pdev);
+
+ vfio_pci_set_irqs_ioctl(vdev, VFIO_IRQ_SET_DATA_NONE |
+ VFIO_IRQ_SET_ACTION_TRIGGER,
+ vdev->irq_type, 0, 0, NULL);
+
+ /* Device closed, don't need mutex here */
+ list_for_each_entry_safe(ioeventfd, ioeventfd_tmp,
+ &vdev->ioeventfds_list, next) {
+ vfio_virqfd_disable(&ioeventfd->virqfd);
+ list_del(&ioeventfd->next);
+ kfree(ioeventfd);
+ }
+ vdev->ioeventfds_nr = 0;
+
+ vdev->virq_disabled = false;
+
+ for (i = 0; i < vdev->num_regions; i++)
+ vdev->region[i].ops->release(vdev, &vdev->region[i]);
+
+ vdev->num_regions = 0;
+ kfree(vdev->region);
+ vdev->region = NULL; /* don't krealloc a freed pointer */
+
+ vfio_config_free(vdev);
+
+ for (i = 0; i < PCI_STD_NUM_BARS; i++) {
+ bar = i + PCI_STD_RESOURCES;
+ if (!vdev->barmap[bar])
+ continue;
+ pci_iounmap(pdev, vdev->barmap[bar]);
+ pci_release_selected_regions(pdev, 1 << bar);
+ vdev->barmap[bar] = NULL;
+ }
+
+ list_for_each_entry_safe(dummy_res, tmp,
+ &vdev->dummy_resources_list, res_next) {
+ list_del(&dummy_res->res_next);
+ release_resource(&dummy_res->resource);
+ kfree(dummy_res);
+ }
+
+ vdev->needs_reset = true;
+
+ /*
+ * If we have saved state, restore it. If we can reset the device,
+ * even better. Resetting with current state seems better than
+ * nothing, but saving and restoring current state without reset
+ * is just busy work.
+ */
+ if (pci_load_and_free_saved_state(pdev, &vdev->pci_saved_state)) {
+ pci_info(pdev, "%s: Couldn't reload saved state\n", __func__);
+
+ if (!vdev->reset_works)
+ goto out;
+
+ pci_save_state(pdev);
+ }
+
+ /*
+ * Disable INTx and MSI, presumably to avoid spurious interrupts
+ * during reset. Stolen from pci_reset_function()
+ */
+ pci_write_config_word(pdev, PCI_COMMAND, PCI_COMMAND_INTX_DISABLE);
+
+ /*
+ * Try to get the locks ourselves to prevent a deadlock. The
+ * success of this is dependent on being able to lock the device,
+ * which is not always possible.
+ * We can not use the "try" reset interface here, which will
+ * overwrite the previously restored configuration information.
+ */
+ if (vdev->reset_works && pci_dev_trylock(pdev)) {
+ if (!__pci_reset_function_locked(pdev))
+ vdev->needs_reset = false;
+ pci_dev_unlock(pdev);
+ }
+
+ pci_restore_state(pdev);
+ out:
+ pci_disable_device(pdev);
+
+ if (!vfio_pci_dev_set_try_reset(vdev->vdev.dev_set) && !disable_idle_d3)
+ vfio_pci_set_power_state(vdev, PCI_D3hot);
+ }
+ EXPORT_SYMBOL_GPL(vfio_pci_core_disable);
+
+ static struct vfio_pci_core_device *get_pf_vdev(struct vfio_pci_core_device *vdev)
+ {
+ struct pci_dev *physfn = pci_physfn(vdev->pdev);
+ struct vfio_device *pf_dev;
+
+ if (!vdev->pdev->is_virtfn)
+ return NULL;
+
+ pf_dev = vfio_device_get_from_dev(&physfn->dev);
+ if (!pf_dev)
+ return NULL;
+
+ if (pci_dev_driver(physfn) != pci_dev_driver(vdev->pdev)) {
+ vfio_device_put(pf_dev);
+ return NULL;
+ }
+
+ return container_of(pf_dev, struct vfio_pci_core_device, vdev);
+ }
+
+ static void vfio_pci_vf_token_user_add(struct vfio_pci_core_device *vdev, int val)
+ {
+ struct vfio_pci_core_device *pf_vdev = get_pf_vdev(vdev);
+
+ if (!pf_vdev)
+ return;
+
+ mutex_lock(&pf_vdev->vf_token->lock);
+ pf_vdev->vf_token->users += val;
+ WARN_ON(pf_vdev->vf_token->users < 0);
+ mutex_unlock(&pf_vdev->vf_token->lock);
+
+ vfio_device_put(&pf_vdev->vdev);
+ }
+
+ void vfio_pci_core_close_device(struct vfio_device *core_vdev)
+ {
+ struct vfio_pci_core_device *vdev =
+ container_of(core_vdev, struct vfio_pci_core_device, vdev);
+
+ vfio_pci_vf_token_user_add(vdev, -1);
+ vfio_spapr_pci_eeh_release(vdev->pdev);
+ vfio_pci_core_disable(vdev);
+
+ mutex_lock(&vdev->igate);
+ if (vdev->err_trigger) {
+ eventfd_ctx_put(vdev->err_trigger);
+ vdev->err_trigger = NULL;
+ }
+ if (vdev->req_trigger) {
+ eventfd_ctx_put(vdev->req_trigger);
+ vdev->req_trigger = NULL;
+ }
+ mutex_unlock(&vdev->igate);
+ }
+ EXPORT_SYMBOL_GPL(vfio_pci_core_close_device);
+
+ void vfio_pci_core_finish_enable(struct vfio_pci_core_device *vdev)
+ {
+ vfio_pci_probe_mmaps(vdev);
+ vfio_spapr_pci_eeh_open(vdev->pdev);
+ vfio_pci_vf_token_user_add(vdev, 1);
+ }
+ EXPORT_SYMBOL_GPL(vfio_pci_core_finish_enable);
+
+ static int vfio_pci_get_irq_count(struct vfio_pci_core_device *vdev, int irq_type)
+ {
+ if (irq_type == VFIO_PCI_INTX_IRQ_INDEX) {
+ u8 pin;
+
+ if (!IS_ENABLED(CONFIG_VFIO_PCI_INTX) ||
+ vdev->nointx || vdev->pdev->is_virtfn)
+ return 0;
+
+ pci_read_config_byte(vdev->pdev, PCI_INTERRUPT_PIN, &pin);
+
+ return pin ? 1 : 0;
+ } else if (irq_type == VFIO_PCI_MSI_IRQ_INDEX) {
+ u8 pos;
+ u16 flags;
+
+ pos = vdev->pdev->msi_cap;
+ if (pos) {
+ pci_read_config_word(vdev->pdev,
+ pos + PCI_MSI_FLAGS, &flags);
+ return 1 << ((flags & PCI_MSI_FLAGS_QMASK) >> 1);
+ }
+ } else if (irq_type == VFIO_PCI_MSIX_IRQ_INDEX) {
+ u8 pos;
+ u16 flags;
+
+ pos = vdev->pdev->msix_cap;
+ if (pos) {
+ pci_read_config_word(vdev->pdev,
+ pos + PCI_MSIX_FLAGS, &flags);
+
+ return (flags & PCI_MSIX_FLAGS_QSIZE) + 1;
+ }
+ } else if (irq_type == VFIO_PCI_ERR_IRQ_INDEX) {
+ if (pci_is_pcie(vdev->pdev))
+ return 1;
+ } else if (irq_type == VFIO_PCI_REQ_IRQ_INDEX) {
+ return 1;
+ }
+
+ return 0;
+ }
+
+ static int vfio_pci_count_devs(struct pci_dev *pdev, void *data)
+ {
+ (*(int *)data)++;
+ return 0;
+ }
+
+ struct vfio_pci_fill_info {
+ int max;
+ int cur;
+ struct vfio_pci_dependent_device *devices;
+ };
+
+ static int vfio_pci_fill_devs(struct pci_dev *pdev, void *data)
+ {
+ struct vfio_pci_fill_info *fill = data;
+ struct iommu_group *iommu_group;
+
+ if (fill->cur == fill->max)
+ return -EAGAIN; /* Something changed, try again */
+
+ iommu_group = iommu_group_get(&pdev->dev);
+ if (!iommu_group)
+ return -EPERM; /* Cannot reset non-isolated devices */
+
+ fill->devices[fill->cur].group_id = iommu_group_id(iommu_group);
+ fill->devices[fill->cur].segment = pci_domain_nr(pdev->bus);
+ fill->devices[fill->cur].bus = pdev->bus->number;
+ fill->devices[fill->cur].devfn = pdev->devfn;
+ fill->cur++;
+ iommu_group_put(iommu_group);
+ return 0;
+ }
+
+ struct vfio_pci_group_info {
+ int count;
+ struct vfio_group **groups;
+ };
+
+ static bool vfio_pci_dev_below_slot(struct pci_dev *pdev, struct pci_slot *slot)
+ {
+ for (; pdev; pdev = pdev->bus->self)
+ if (pdev->bus == slot->bus)
+ return (pdev->slot == slot);
+ return false;
+ }
+
+ struct vfio_pci_walk_info {
+ int (*fn)(struct pci_dev *, void *data);
+ void *data;
+ struct pci_dev *pdev;
+ bool slot;
+ int ret;
+ };
+
+ static int vfio_pci_walk_wrapper(struct pci_dev *pdev, void *data)
+ {
+ struct vfio_pci_walk_info *walk = data;
+
+ if (!walk->slot || vfio_pci_dev_below_slot(pdev, walk->pdev->slot))
+ walk->ret = walk->fn(pdev, walk->data);
+
+ return walk->ret;
+ }
+
+ static int vfio_pci_for_each_slot_or_bus(struct pci_dev *pdev,
+ int (*fn)(struct pci_dev *,
+ void *data), void *data,
+ bool slot)
+ {
+ struct vfio_pci_walk_info walk = {
+ .fn = fn, .data = data, .pdev = pdev, .slot = slot, .ret = 0,
+ };
+
+ pci_walk_bus(pdev->bus, vfio_pci_walk_wrapper, &walk);
+
+ return walk.ret;
+ }
+
+ static int msix_mmappable_cap(struct vfio_pci_core_device *vdev,
+ struct vfio_info_cap *caps)
+ {
+ struct vfio_info_cap_header header = {
+ .id = VFIO_REGION_INFO_CAP_MSIX_MAPPABLE,
+ .version = 1
+ };
+
+ return vfio_info_add_capability(caps, &header, sizeof(header));
+ }
+
+ int vfio_pci_register_dev_region(struct vfio_pci_core_device *vdev,
+ unsigned int type, unsigned int subtype,
+ const struct vfio_pci_regops *ops,
+ size_t size, u32 flags, void *data)
+ {
+ struct vfio_pci_region *region;
+
+ region = krealloc(vdev->region,
+ (vdev->num_regions + 1) * sizeof(*region),
+ GFP_KERNEL);
+ if (!region)
+ return -ENOMEM;
+
+ vdev->region = region;
+ vdev->region[vdev->num_regions].type = type;
+ vdev->region[vdev->num_regions].subtype = subtype;
+ vdev->region[vdev->num_regions].ops = ops;
+ vdev->region[vdev->num_regions].size = size;
+ vdev->region[vdev->num_regions].flags = flags;
+ vdev->region[vdev->num_regions].data = data;
+
+ vdev->num_regions++;
+
+ return 0;
+ }
+ EXPORT_SYMBOL_GPL(vfio_pci_register_dev_region);
+
+ long vfio_pci_core_ioctl(struct vfio_device *core_vdev, unsigned int cmd,
+ unsigned long arg)
+ {
+ struct vfio_pci_core_device *vdev =
+ container_of(core_vdev, struct vfio_pci_core_device, vdev);
+ unsigned long minsz;
+
+ if (cmd == VFIO_DEVICE_GET_INFO) {
+ struct vfio_device_info info;
+ struct vfio_info_cap caps = { .buf = NULL, .size = 0 };
+ unsigned long capsz;
+ int ret;
+
+ minsz = offsetofend(struct vfio_device_info, num_irqs);
+
+ /* For backward compatibility, cannot require this */
+ capsz = offsetofend(struct vfio_iommu_type1_info, cap_offset);
+
+ if (copy_from_user(&info, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (info.argsz < minsz)
+ return -EINVAL;
+
+ if (info.argsz >= capsz) {
+ minsz = capsz;
+ info.cap_offset = 0;
+ }
+
+ info.flags = VFIO_DEVICE_FLAGS_PCI;
+
+ if (vdev->reset_works)
+ info.flags |= VFIO_DEVICE_FLAGS_RESET;
+
+ info.num_regions = VFIO_PCI_NUM_REGIONS + vdev->num_regions;
+ info.num_irqs = VFIO_PCI_NUM_IRQS;
+
+ ret = vfio_pci_info_zdev_add_caps(vdev, &caps);
+ if (ret && ret != -ENODEV) {
+ pci_warn(vdev->pdev, "Failed to setup zPCI info capabilities\n");
+ return ret;
+ }
+
+ if (caps.size) {
+ info.flags |= VFIO_DEVICE_FLAGS_CAPS;
+ if (info.argsz < sizeof(info) + caps.size) {
+ info.argsz = sizeof(info) + caps.size;
+ } else {
+ vfio_info_cap_shift(&caps, sizeof(info));
+ if (copy_to_user((void __user *)arg +
+ sizeof(info), caps.buf,
+ caps.size)) {
+ kfree(caps.buf);
+ return -EFAULT;
+ }
+ info.cap_offset = sizeof(info);
+ }
+
+ kfree(caps.buf);
+ }
+
+ return copy_to_user((void __user *)arg, &info, minsz) ?
+ -EFAULT : 0;
+
+ } else if (cmd == VFIO_DEVICE_GET_REGION_INFO) {
+ struct pci_dev *pdev = vdev->pdev;
+ struct vfio_region_info info;
+ struct vfio_info_cap caps = { .buf = NULL, .size = 0 };
+ int i, ret;
+
+ minsz = offsetofend(struct vfio_region_info, offset);
+
+ if (copy_from_user(&info, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (info.argsz < minsz)
+ return -EINVAL;
+
+ switch (info.index) {
+ case VFIO_PCI_CONFIG_REGION_INDEX:
+ info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
+ info.size = pdev->cfg_size;
+ info.flags = VFIO_REGION_INFO_FLAG_READ |
+ VFIO_REGION_INFO_FLAG_WRITE;
+ break;
+ case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX:
+ info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
+ info.size = pci_resource_len(pdev, info.index);
+ if (!info.size) {
+ info.flags = 0;
+ break;
+ }
+
+ info.flags = VFIO_REGION_INFO_FLAG_READ |
+ VFIO_REGION_INFO_FLAG_WRITE;
+ if (vdev->bar_mmap_supported[info.index]) {
+ info.flags |= VFIO_REGION_INFO_FLAG_MMAP;
+ if (info.index == vdev->msix_bar) {
+ ret = msix_mmappable_cap(vdev, &caps);
+ if (ret)
+ return ret;
+ }
+ }
+
+ break;
+ case VFIO_PCI_ROM_REGION_INDEX:
+ {
+ void __iomem *io;
+ size_t size;
+ u16 cmd;
+
+ info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
+ info.flags = 0;
+
+ /* Report the BAR size, not the ROM size */
+ info.size = pci_resource_len(pdev, info.index);
+ if (!info.size) {
+ /* Shadow ROMs appear as PCI option ROMs */
+ if (pdev->resource[PCI_ROM_RESOURCE].flags &
+ IORESOURCE_ROM_SHADOW)
+ info.size = 0x20000;
+ else
+ break;
+ }
+
+ /*
+ * Is it really there? Enable memory decode for
+ * implicit access in pci_map_rom().
+ */
+ cmd = vfio_pci_memory_lock_and_enable(vdev);
+ io = pci_map_rom(pdev, &size);
+ if (io) {
+ info.flags = VFIO_REGION_INFO_FLAG_READ;
+ pci_unmap_rom(pdev, io);
+ } else {
+ info.size = 0;
+ }
+ vfio_pci_memory_unlock_and_restore(vdev, cmd);
+
+ break;
+ }
+ case VFIO_PCI_VGA_REGION_INDEX:
+ if (!vdev->has_vga)
+ return -EINVAL;
+
+ info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
+ info.size = 0xc0000;
+ info.flags = VFIO_REGION_INFO_FLAG_READ |
+ VFIO_REGION_INFO_FLAG_WRITE;
+
+ break;
+ default:
+ {
+ struct vfio_region_info_cap_type cap_type = {
+ .header.id = VFIO_REGION_INFO_CAP_TYPE,
+ .header.version = 1 };
+
+ if (info.index >=
+ VFIO_PCI_NUM_REGIONS + vdev->num_regions)
+ return -EINVAL;
+ info.index = array_index_nospec(info.index,
+ VFIO_PCI_NUM_REGIONS +
+ vdev->num_regions);
+
+ i = info.index - VFIO_PCI_NUM_REGIONS;
+
+ info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
+ info.size = vdev->region[i].size;
+ info.flags = vdev->region[i].flags;
+
+ cap_type.type = vdev->region[i].type;
+ cap_type.subtype = vdev->region[i].subtype;
+
+ ret = vfio_info_add_capability(&caps, &cap_type.header,
+ sizeof(cap_type));
+ if (ret)
+ return ret;
+
+ if (vdev->region[i].ops->add_capability) {
+ ret = vdev->region[i].ops->add_capability(vdev,
+ &vdev->region[i], &caps);
+ if (ret)
+ return ret;
+ }
+ }
+ }
+
+ if (caps.size) {
+ info.flags |= VFIO_REGION_INFO_FLAG_CAPS;
+ if (info.argsz < sizeof(info) + caps.size) {
+ info.argsz = sizeof(info) + caps.size;
+ info.cap_offset = 0;
+ } else {
+ vfio_info_cap_shift(&caps, sizeof(info));
+ if (copy_to_user((void __user *)arg +
+ sizeof(info), caps.buf,
+ caps.size)) {
+ kfree(caps.buf);
+ return -EFAULT;
+ }
+ info.cap_offset = sizeof(info);
+ }
+
+ kfree(caps.buf);
+ }
+
+ return copy_to_user((void __user *)arg, &info, minsz) ?
+ -EFAULT : 0;
+
+ } else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) {
+ struct vfio_irq_info info;
+
+ minsz = offsetofend(struct vfio_irq_info, count);
+
+ if (copy_from_user(&info, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (info.argsz < minsz || info.index >= VFIO_PCI_NUM_IRQS)
+ return -EINVAL;
+
+ switch (info.index) {
+ case VFIO_PCI_INTX_IRQ_INDEX ... VFIO_PCI_MSIX_IRQ_INDEX:
+ case VFIO_PCI_REQ_IRQ_INDEX:
+ break;
+ case VFIO_PCI_ERR_IRQ_INDEX:
+ if (pci_is_pcie(vdev->pdev))
+ break;
+ fallthrough;
+ default:
+ return -EINVAL;
+ }
+
+ info.flags = VFIO_IRQ_INFO_EVENTFD;
+
+ info.count = vfio_pci_get_irq_count(vdev, info.index);
+
+ if (info.index == VFIO_PCI_INTX_IRQ_INDEX)
+ info.flags |= (VFIO_IRQ_INFO_MASKABLE |
+ VFIO_IRQ_INFO_AUTOMASKED);
+ else
+ info.flags |= VFIO_IRQ_INFO_NORESIZE;
+
+ return copy_to_user((void __user *)arg, &info, minsz) ?
+ -EFAULT : 0;
+
+ } else if (cmd == VFIO_DEVICE_SET_IRQS) {
+ struct vfio_irq_set hdr;
+ u8 *data = NULL;
+ int max, ret = 0;
+ size_t data_size = 0;
+
+ minsz = offsetofend(struct vfio_irq_set, count);
+
+ if (copy_from_user(&hdr, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ max = vfio_pci_get_irq_count(vdev, hdr.index);
+
+ ret = vfio_set_irqs_validate_and_prepare(&hdr, max,
+ VFIO_PCI_NUM_IRQS, &data_size);
+ if (ret)
+ return ret;
+
+ if (data_size) {
+ data = memdup_user((void __user *)(arg + minsz),
+ data_size);
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+ }
+
+ mutex_lock(&vdev->igate);
+
+ ret = vfio_pci_set_irqs_ioctl(vdev, hdr.flags, hdr.index,
+ hdr.start, hdr.count, data);
+
+ mutex_unlock(&vdev->igate);
+ kfree(data);
+
+ return ret;
+
+ } else if (cmd == VFIO_DEVICE_RESET) {
+ int ret;
+
+ if (!vdev->reset_works)
+ return -EINVAL;
+
+ vfio_pci_zap_and_down_write_memory_lock(vdev);
+ ret = pci_try_reset_function(vdev->pdev);
+ up_write(&vdev->memory_lock);
+
+ return ret;
+
+ } else if (cmd == VFIO_DEVICE_GET_PCI_HOT_RESET_INFO) {
+ struct vfio_pci_hot_reset_info hdr;
+ struct vfio_pci_fill_info fill = { 0 };
+ struct vfio_pci_dependent_device *devices = NULL;
+ bool slot = false;
+ int ret = 0;
+
+ minsz = offsetofend(struct vfio_pci_hot_reset_info, count);
+
+ if (copy_from_user(&hdr, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (hdr.argsz < minsz)
+ return -EINVAL;
+
+ hdr.flags = 0;
+
+ /* Can we do a slot or bus reset or neither? */
+ if (!pci_probe_reset_slot(vdev->pdev->slot))
+ slot = true;
+ else if (pci_probe_reset_bus(vdev->pdev->bus))
+ return -ENODEV;
+
+ /* How many devices are affected? */
+ ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
+ vfio_pci_count_devs,
+ &fill.max, slot);
+ if (ret)
+ return ret;
+
+ WARN_ON(!fill.max); /* Should always be at least one */
+
+ /*
+ * If there's enough space, fill it now, otherwise return
+ * -ENOSPC and the number of devices affected.
+ */
+ if (hdr.argsz < sizeof(hdr) + (fill.max * sizeof(*devices))) {
+ ret = -ENOSPC;
+ hdr.count = fill.max;
+ goto reset_info_exit;
+ }
+
+ devices = kcalloc(fill.max, sizeof(*devices), GFP_KERNEL);
+ if (!devices)
+ return -ENOMEM;
+
+ fill.devices = devices;
+
+ ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
+ vfio_pci_fill_devs,
+ &fill, slot);
+
+ /*
+ * If a device was removed between counting and filling,
+ * we may come up short of fill.max. If a device was
+ * added, we'll have a return of -EAGAIN above.
+ */
+ if (!ret)
+ hdr.count = fill.cur;
+
+ reset_info_exit:
+ if (copy_to_user((void __user *)arg, &hdr, minsz))
+ ret = -EFAULT;
+
+ if (!ret) {
+ if (copy_to_user((void __user *)(arg + minsz), devices,
+ hdr.count * sizeof(*devices)))
+ ret = -EFAULT;
+ }
+
+ kfree(devices);
+ return ret;
+
+ } else if (cmd == VFIO_DEVICE_PCI_HOT_RESET) {
+ struct vfio_pci_hot_reset hdr;
+ int32_t *group_fds;
+ struct vfio_group **groups;
+ struct vfio_pci_group_info info;
+ bool slot = false;
+ int group_idx, count = 0, ret = 0;
+
+ minsz = offsetofend(struct vfio_pci_hot_reset, count);
+
+ if (copy_from_user(&hdr, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (hdr.argsz < minsz || hdr.flags)
+ return -EINVAL;
+
+ /* Can we do a slot or bus reset or neither? */
+ if (!pci_probe_reset_slot(vdev->pdev->slot))
+ slot = true;
+ else if (pci_probe_reset_bus(vdev->pdev->bus))
+ return -ENODEV;
+
+ /*
+ * We can't let userspace give us an arbitrarily large
+ * buffer to copy, so verify how many we think there
+ * could be. Note groups can have multiple devices so
+ * one group per device is the max.
+ */
+ ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
+ vfio_pci_count_devs,
+ &count, slot);
+ if (ret)
+ return ret;
+
+ /* Somewhere between 1 and count is OK */
+ if (!hdr.count || hdr.count > count)
+ return -EINVAL;
+
+ group_fds = kcalloc(hdr.count, sizeof(*group_fds), GFP_KERNEL);
+ groups = kcalloc(hdr.count, sizeof(*groups), GFP_KERNEL);
+ if (!group_fds || !groups) {
+ kfree(group_fds);
+ kfree(groups);
+ return -ENOMEM;
+ }
+
+ if (copy_from_user(group_fds, (void __user *)(arg + minsz),
+ hdr.count * sizeof(*group_fds))) {
+ kfree(group_fds);
+ kfree(groups);
+ return -EFAULT;
+ }
+
+ /*
+ * For each group_fd, get the group through the vfio external
+ * user interface and store the group and iommu ID. This
+ * ensures the group is held across the reset.
+ */
+ for (group_idx = 0; group_idx < hdr.count; group_idx++) {
+ struct vfio_group *group;
+ struct fd f = fdget(group_fds[group_idx]);
+ if (!f.file) {
+ ret = -EBADF;
+ break;
+ }
+
+ group = vfio_group_get_external_user(f.file);
+ fdput(f);
+ if (IS_ERR(group)) {
+ ret = PTR_ERR(group);
+ break;
+ }
+
+ groups[group_idx] = group;
+ }
+
+ kfree(group_fds);
+
+ /* release reference to groups on error */
+ if (ret)
+ goto hot_reset_release;
+
+ info.count = hdr.count;
+ info.groups = groups;
+
+ ret = vfio_pci_dev_set_hot_reset(vdev->vdev.dev_set, &info);
+
+ hot_reset_release:
+ for (group_idx--; group_idx >= 0; group_idx--)
+ vfio_group_put_external_user(groups[group_idx]);
+
+ kfree(groups);
+ return ret;
+ } else if (cmd == VFIO_DEVICE_IOEVENTFD) {
+ struct vfio_device_ioeventfd ioeventfd;
+ int count;
+
+ minsz = offsetofend(struct vfio_device_ioeventfd, fd);
+
+ if (copy_from_user(&ioeventfd, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (ioeventfd.argsz < minsz)
+ return -EINVAL;
+
+ if (ioeventfd.flags & ~VFIO_DEVICE_IOEVENTFD_SIZE_MASK)
+ return -EINVAL;
+
+ count = ioeventfd.flags & VFIO_DEVICE_IOEVENTFD_SIZE_MASK;
+
+ if (hweight8(count) != 1 || ioeventfd.fd < -1)
+ return -EINVAL;
+
+ return vfio_pci_ioeventfd(vdev, ioeventfd.offset,
+ ioeventfd.data, count, ioeventfd.fd);
+ } else if (cmd == VFIO_DEVICE_FEATURE) {
+ struct vfio_device_feature feature;
+ uuid_t uuid;
+
+ minsz = offsetofend(struct vfio_device_feature, flags);
+
+ if (copy_from_user(&feature, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (feature.argsz < minsz)
+ return -EINVAL;
+
+ /* Check unknown flags */
+ if (feature.flags & ~(VFIO_DEVICE_FEATURE_MASK |
+ VFIO_DEVICE_FEATURE_SET |
+ VFIO_DEVICE_FEATURE_GET |
+ VFIO_DEVICE_FEATURE_PROBE))
+ return -EINVAL;
+
+ /* GET & SET are mutually exclusive except with PROBE */
+ if (!(feature.flags & VFIO_DEVICE_FEATURE_PROBE) &&
+ (feature.flags & VFIO_DEVICE_FEATURE_SET) &&
+ (feature.flags & VFIO_DEVICE_FEATURE_GET))
+ return -EINVAL;
+
+ switch (feature.flags & VFIO_DEVICE_FEATURE_MASK) {
+ case VFIO_DEVICE_FEATURE_PCI_VF_TOKEN:
+ if (!vdev->vf_token)
+ return -ENOTTY;
+
+ /*
+ * We do not support GET of the VF Token UUID as this
+ * could expose the token of the previous device user.
+ */
+ if (feature.flags & VFIO_DEVICE_FEATURE_GET)
+ return -EINVAL;
+
+ if (feature.flags & VFIO_DEVICE_FEATURE_PROBE)
+ return 0;
+
+ /* Don't SET unless told to do so */
+ if (!(feature.flags & VFIO_DEVICE_FEATURE_SET))
+ return -EINVAL;
+
+ if (feature.argsz < minsz + sizeof(uuid))
+ return -EINVAL;
+
+ if (copy_from_user(&uuid, (void __user *)(arg + minsz),
+ sizeof(uuid)))
+ return -EFAULT;
+
+ mutex_lock(&vdev->vf_token->lock);
+ uuid_copy(&vdev->vf_token->uuid, &uuid);
+ mutex_unlock(&vdev->vf_token->lock);
+
+ return 0;
+ default:
+ return -ENOTTY;
+ }
+ }
+
+ return -ENOTTY;
+ }
+ EXPORT_SYMBOL_GPL(vfio_pci_core_ioctl);
+
+ static ssize_t vfio_pci_rw(struct vfio_pci_core_device *vdev, char __user *buf,
+ size_t count, loff_t *ppos, bool iswrite)
+ {
+ unsigned int index = VFIO_PCI_OFFSET_TO_INDEX(*ppos);
+
+ if (index >= VFIO_PCI_NUM_REGIONS + vdev->num_regions)
+ return -EINVAL;
+
+ switch (index) {
+ case VFIO_PCI_CONFIG_REGION_INDEX:
+ return vfio_pci_config_rw(vdev, buf, count, ppos, iswrite);
+
+ case VFIO_PCI_ROM_REGION_INDEX:
+ if (iswrite)
+ return -EINVAL;
+ return vfio_pci_bar_rw(vdev, buf, count, ppos, false);
+
+ case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX:
+ return vfio_pci_bar_rw(vdev, buf, count, ppos, iswrite);
+
+ case VFIO_PCI_VGA_REGION_INDEX:
+ return vfio_pci_vga_rw(vdev, buf, count, ppos, iswrite);
+ default:
+ index -= VFIO_PCI_NUM_REGIONS;
+ return vdev->region[index].ops->rw(vdev, buf,
+ count, ppos, iswrite);
+ }
+
+ return -EINVAL;
+ }
+
+ ssize_t vfio_pci_core_read(struct vfio_device *core_vdev, char __user *buf,
+ size_t count, loff_t *ppos)
+ {
+ struct vfio_pci_core_device *vdev =
+ container_of(core_vdev, struct vfio_pci_core_device, vdev);
+
+ if (!count)
+ return 0;
+
+ return vfio_pci_rw(vdev, buf, count, ppos, false);
+ }
+ EXPORT_SYMBOL_GPL(vfio_pci_core_read);
+
+ ssize_t vfio_pci_core_write(struct vfio_device *core_vdev, const char __user *buf,
+ size_t count, loff_t *ppos)
+ {
+ struct vfio_pci_core_device *vdev =
+ container_of(core_vdev, struct vfio_pci_core_device, vdev);
+
+ if (!count)
+ return 0;
+
+ return vfio_pci_rw(vdev, (char __user *)buf, count, ppos, true);
+ }
+ EXPORT_SYMBOL_GPL(vfio_pci_core_write);
+
+ /* Return 1 on zap and vma_lock acquired, 0 on contention (only with @try) */
+ static int vfio_pci_zap_and_vma_lock(struct vfio_pci_core_device *vdev, bool try)
+ {
+ struct vfio_pci_mmap_vma *mmap_vma, *tmp;
+
+ /*
+ * Lock ordering:
+ * vma_lock is nested under mmap_lock for vm_ops callback paths.
+ * The memory_lock semaphore is used by both code paths calling
+ * into this function to zap vmas and the vm_ops.fault callback
+ * to protect the memory enable state of the device.
+ *
+ * When zapping vmas we need to maintain the mmap_lock => vma_lock
+ * ordering, which requires using vma_lock to walk vma_list to
+ * acquire an mm, then dropping vma_lock to get the mmap_lock and
+ * reacquiring vma_lock. This logic is derived from similar
+ * requirements in uverbs_user_mmap_disassociate().
+ *
+ * mmap_lock must always be the top-level lock when it is taken.
+ * Therefore we can only hold the memory_lock write lock when
+ * vma_list is empty, as we'd need to take mmap_lock to clear
+ * entries. vma_list can only be guaranteed empty when holding
+ * vma_lock, thus memory_lock is nested under vma_lock.
+ *
+ * This enables the vm_ops.fault callback to acquire vma_lock,
+ * followed by memory_lock read lock, while already holding
+ * mmap_lock without risk of deadlock.
+ */
+ while (1) {
+ struct mm_struct *mm = NULL;
+
+ if (try) {
+ if (!mutex_trylock(&vdev->vma_lock))
+ return 0;
+ } else {
+ mutex_lock(&vdev->vma_lock);
+ }
+ while (!list_empty(&vdev->vma_list)) {
+ mmap_vma = list_first_entry(&vdev->vma_list,
+ struct vfio_pci_mmap_vma,
+ vma_next);
+ mm = mmap_vma->vma->vm_mm;
+ if (mmget_not_zero(mm))
+ break;
+
+ list_del(&mmap_vma->vma_next);
+ kfree(mmap_vma);
+ mm = NULL;
+ }
+ if (!mm)
+ return 1;
+ mutex_unlock(&vdev->vma_lock);
+
+ if (try) {
+ if (!mmap_read_trylock(mm)) {
+ mmput(mm);
+ return 0;
+ }
+ } else {
+ mmap_read_lock(mm);
+ }
+ if (try) {
+ if (!mutex_trylock(&vdev->vma_lock)) {
+ mmap_read_unlock(mm);
+ mmput(mm);
+ return 0;
+ }
+ } else {
+ mutex_lock(&vdev->vma_lock);
+ }
+ list_for_each_entry_safe(mmap_vma, tmp,
+ &vdev->vma_list, vma_next) {
+ struct vm_area_struct *vma = mmap_vma->vma;
+
+ if (vma->vm_mm != mm)
+ continue;
+
+ list_del(&mmap_vma->vma_next);
+ kfree(mmap_vma);
+
+ zap_vma_ptes(vma, vma->vm_start,
+ vma->vm_end - vma->vm_start);
+ }
+ mutex_unlock(&vdev->vma_lock);
+ mmap_read_unlock(mm);
+ mmput(mm);
+ }
+ }
+
+ void vfio_pci_zap_and_down_write_memory_lock(struct vfio_pci_core_device *vdev)
+ {
+ vfio_pci_zap_and_vma_lock(vdev, false);
+ down_write(&vdev->memory_lock);
+ mutex_unlock(&vdev->vma_lock);
+ }
+
+ u16 vfio_pci_memory_lock_and_enable(struct vfio_pci_core_device *vdev)
+ {
+ u16 cmd;
+
+ down_write(&vdev->memory_lock);
+ pci_read_config_word(vdev->pdev, PCI_COMMAND, &cmd);
+ if (!(cmd & PCI_COMMAND_MEMORY))
+ pci_write_config_word(vdev->pdev, PCI_COMMAND,
+ cmd | PCI_COMMAND_MEMORY);
+
+ return cmd;
+ }
+
+ void vfio_pci_memory_unlock_and_restore(struct vfio_pci_core_device *vdev, u16 cmd)
+ {
+ pci_write_config_word(vdev->pdev, PCI_COMMAND, cmd);
+ up_write(&vdev->memory_lock);
+ }
+
+ /* Caller holds vma_lock */
+ static int __vfio_pci_add_vma(struct vfio_pci_core_device *vdev,
+ struct vm_area_struct *vma)
+ {
+ struct vfio_pci_mmap_vma *mmap_vma;
+
+ mmap_vma = kmalloc(sizeof(*mmap_vma), GFP_KERNEL);
+ if (!mmap_vma)
+ return -ENOMEM;
+
+ mmap_vma->vma = vma;
+ list_add(&mmap_vma->vma_next, &vdev->vma_list);
+
+ return 0;
+ }
+
+ /*
+ * Zap mmaps on open so that we can fault them in on access and therefore
+ * our vma_list only tracks mappings accessed since last zap.
+ */
+ static void vfio_pci_mmap_open(struct vm_area_struct *vma)
+ {
+ zap_vma_ptes(vma, vma->vm_start, vma->vm_end - vma->vm_start);
+ }
+
+ static void vfio_pci_mmap_close(struct vm_area_struct *vma)
+ {
+ struct vfio_pci_core_device *vdev = vma->vm_private_data;
+ struct vfio_pci_mmap_vma *mmap_vma;
+
+ mutex_lock(&vdev->vma_lock);
+ list_for_each_entry(mmap_vma, &vdev->vma_list, vma_next) {
+ if (mmap_vma->vma == vma) {
+ list_del(&mmap_vma->vma_next);
+ kfree(mmap_vma);
+ break;
+ }
+ }
+ mutex_unlock(&vdev->vma_lock);
+ }
+
+ static vm_fault_t vfio_pci_mmap_fault(struct vm_fault *vmf)
+ {
+ struct vm_area_struct *vma = vmf->vma;
+ struct vfio_pci_core_device *vdev = vma->vm_private_data;
+ struct vfio_pci_mmap_vma *mmap_vma;
+ vm_fault_t ret = VM_FAULT_NOPAGE;
+
+ mutex_lock(&vdev->vma_lock);
+ down_read(&vdev->memory_lock);
+
+ if (!__vfio_pci_memory_enabled(vdev)) {
+ ret = VM_FAULT_SIGBUS;
+ goto up_out;
+ }
+
+ /*
+ * We populate the whole vma on fault, so we need to test whether
+ * the vma has already been mapped, such as for concurrent faults
+ * to the same vma. io_remap_pfn_range() will trigger a BUG_ON if
+ * we ask it to fill the same range again.
+ */
+ list_for_each_entry(mmap_vma, &vdev->vma_list, vma_next) {
+ if (mmap_vma->vma == vma)
+ goto up_out;
+ }
+
+ if (io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
+ vma->vm_end - vma->vm_start,
+ vma->vm_page_prot)) {
+ ret = VM_FAULT_SIGBUS;
+ zap_vma_ptes(vma, vma->vm_start, vma->vm_end - vma->vm_start);
+ goto up_out;
+ }
+
+ if (__vfio_pci_add_vma(vdev, vma)) {
+ ret = VM_FAULT_OOM;
+ zap_vma_ptes(vma, vma->vm_start, vma->vm_end - vma->vm_start);
+ }
+
+ up_out:
+ up_read(&vdev->memory_lock);
+ mutex_unlock(&vdev->vma_lock);
+ return ret;
+ }
+
+ static const struct vm_operations_struct vfio_pci_mmap_ops = {
+ .open = vfio_pci_mmap_open,
+ .close = vfio_pci_mmap_close,
+ .fault = vfio_pci_mmap_fault,
+ };
+
+ int vfio_pci_core_mmap(struct vfio_device *core_vdev, struct vm_area_struct *vma)
+ {
+ struct vfio_pci_core_device *vdev =
+ container_of(core_vdev, struct vfio_pci_core_device, vdev);
+ struct pci_dev *pdev = vdev->pdev;
+ unsigned int index;
+ u64 phys_len, req_len, pgoff, req_start;
+ int ret;
+
+ index = vma->vm_pgoff >> (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT);
+
+ if (index >= VFIO_PCI_NUM_REGIONS + vdev->num_regions)
+ return -EINVAL;
+ if (vma->vm_end < vma->vm_start)
+ return -EINVAL;
+ if ((vma->vm_flags & VM_SHARED) == 0)
+ return -EINVAL;
+ if (index >= VFIO_PCI_NUM_REGIONS) {
+ int regnum = index - VFIO_PCI_NUM_REGIONS;
+ struct vfio_pci_region *region = vdev->region + regnum;
+
+ if (region->ops && region->ops->mmap &&
+ (region->flags & VFIO_REGION_INFO_FLAG_MMAP))
+ return region->ops->mmap(vdev, region, vma);
+ return -EINVAL;
+ }
+ if (index >= VFIO_PCI_ROM_REGION_INDEX)
+ return -EINVAL;
+ if (!vdev->bar_mmap_supported[index])
+ return -EINVAL;
+
+ phys_len = PAGE_ALIGN(pci_resource_len(pdev, index));
+ req_len = vma->vm_end - vma->vm_start;
+ pgoff = vma->vm_pgoff &
+ ((1U << (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT)) - 1);
+ req_start = pgoff << PAGE_SHIFT;
+
+ if (req_start + req_len > phys_len)
+ return -EINVAL;
+
+ /*
+ * Even though we don't make use of the barmap for the mmap,
+ * we need to request the region and the barmap tracks that.
+ */
+ if (!vdev->barmap[index]) {
+ ret = pci_request_selected_regions(pdev,
+ 1 << index, "vfio-pci");
+ if (ret)
+ return ret;
+
+ vdev->barmap[index] = pci_iomap(pdev, index, 0);
+ if (!vdev->barmap[index]) {
+ pci_release_selected_regions(pdev, 1 << index);
+ return -ENOMEM;
+ }
+ }
+
+ vma->vm_private_data = vdev;
+ vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+ vma->vm_pgoff = (pci_resource_start(pdev, index) >> PAGE_SHIFT) + pgoff;
+
+ /*
+ * See remap_pfn_range(), called from vfio_pci_fault() but we can't
+ * change vm_flags within the fault handler. Set them now.
+ */
+ vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP;
+ vma->vm_ops = &vfio_pci_mmap_ops;
+
+ return 0;
+ }
+ EXPORT_SYMBOL_GPL(vfio_pci_core_mmap);
+
+ void vfio_pci_core_request(struct vfio_device *core_vdev, unsigned int count)
+ {
+ struct vfio_pci_core_device *vdev =
+ container_of(core_vdev, struct vfio_pci_core_device, vdev);
+ struct pci_dev *pdev = vdev->pdev;
+
+ mutex_lock(&vdev->igate);
+
+ if (vdev->req_trigger) {
+ if (!(count % 10))
+ pci_notice_ratelimited(pdev,
+ "Relaying device request to user (#%u)\n",
+ count);
+ eventfd_signal(vdev->req_trigger, 1);
+ } else if (count == 0) {
+ pci_warn(pdev,
+ "No device request channel registered, blocked until released by user\n");
+ }
+
+ mutex_unlock(&vdev->igate);
+ }
+ EXPORT_SYMBOL_GPL(vfio_pci_core_request);
+
+ static int vfio_pci_validate_vf_token(struct vfio_pci_core_device *vdev,
+ bool vf_token, uuid_t *uuid)
+ {
+ /*
+ * There's always some degree of trust or collaboration between SR-IOV
+ * PF and VFs, even if just that the PF hosts the SR-IOV capability and
+ * can disrupt VFs with a reset, but often the PF has more explicit
+ * access to deny service to the VF or access data passed through the
+ * VF. We therefore require an opt-in via a shared VF token (UUID) to
+ * represent this trust. This both prevents that a VF driver might
+ * assume the PF driver is a trusted, in-kernel driver, and also that
+ * a PF driver might be replaced with a rogue driver, unknown to in-use
+ * VF drivers.
+ *
+ * Therefore when presented with a VF, if the PF is a vfio device and
+ * it is bound to the vfio-pci driver, the user needs to provide a VF
+ * token to access the device, in the form of appending a vf_token to
+ * the device name, for example:
+ *
+ * "0000:04:10.0 vf_token=bd8d9d2b-5a5f-4f5a-a211-f591514ba1f3"
+ *
+ * When presented with a PF which has VFs in use, the user must also
+ * provide the current VF token to prove collaboration with existing
+ * VF users. If VFs are not in use, the VF token provided for the PF
+ * device will act to set the VF token.
+ *
+ * If the VF token is provided but unused, an error is generated.
+ */
+ if (!vdev->pdev->is_virtfn && !vdev->vf_token && !vf_token)
+ return 0; /* No VF token provided or required */
+
+ if (vdev->pdev->is_virtfn) {
+ struct vfio_pci_core_device *pf_vdev = get_pf_vdev(vdev);
+ bool match;
+
+ if (!pf_vdev) {
+ if (!vf_token)
+ return 0; /* PF is not vfio-pci, no VF token */
+
+ pci_info_ratelimited(vdev->pdev,
+ "VF token incorrectly provided, PF not bound to vfio-pci\n");
+ return -EINVAL;
+ }
+
+ if (!vf_token) {
+ vfio_device_put(&pf_vdev->vdev);
+ pci_info_ratelimited(vdev->pdev,
+ "VF token required to access device\n");
+ return -EACCES;
+ }
+
+ mutex_lock(&pf_vdev->vf_token->lock);
+ match = uuid_equal(uuid, &pf_vdev->vf_token->uuid);
+ mutex_unlock(&pf_vdev->vf_token->lock);
+
+ vfio_device_put(&pf_vdev->vdev);
+
+ if (!match) {
+ pci_info_ratelimited(vdev->pdev,
+ "Incorrect VF token provided for device\n");
+ return -EACCES;
+ }
+ } else if (vdev->vf_token) {
+ mutex_lock(&vdev->vf_token->lock);
+ if (vdev->vf_token->users) {
+ if (!vf_token) {
+ mutex_unlock(&vdev->vf_token->lock);
+ pci_info_ratelimited(vdev->pdev,
+ "VF token required to access device\n");
+ return -EACCES;
+ }
+
+ if (!uuid_equal(uuid, &vdev->vf_token->uuid)) {
+ mutex_unlock(&vdev->vf_token->lock);
+ pci_info_ratelimited(vdev->pdev,
+ "Incorrect VF token provided for device\n");
+ return -EACCES;
+ }
+ } else if (vf_token) {
+ uuid_copy(&vdev->vf_token->uuid, uuid);
+ }
+
+ mutex_unlock(&vdev->vf_token->lock);
+ } else if (vf_token) {
+ pci_info_ratelimited(vdev->pdev,
+ "VF token incorrectly provided, not a PF or VF\n");
+ return -EINVAL;
+ }
+
+ return 0;
+ }
+
+ #define VF_TOKEN_ARG "vf_token="
+
+ int vfio_pci_core_match(struct vfio_device *core_vdev, char *buf)
+ {
+ struct vfio_pci_core_device *vdev =
+ container_of(core_vdev, struct vfio_pci_core_device, vdev);
+ bool vf_token = false;
+ uuid_t uuid;
+ int ret;
+
+ if (strncmp(pci_name(vdev->pdev), buf, strlen(pci_name(vdev->pdev))))
+ return 0; /* No match */
+
+ if (strlen(buf) > strlen(pci_name(vdev->pdev))) {
+ buf += strlen(pci_name(vdev->pdev));
+
+ if (*buf != ' ')
+ return 0; /* No match: non-whitespace after name */
+
+ while (*buf) {
+ if (*buf == ' ') {
+ buf++;
+ continue;
+ }
+
+ if (!vf_token && !strncmp(buf, VF_TOKEN_ARG,
+ strlen(VF_TOKEN_ARG))) {
+ buf += strlen(VF_TOKEN_ARG);
+
+ if (strlen(buf) < UUID_STRING_LEN)
+ return -EINVAL;
+
+ ret = uuid_parse(buf, &uuid);
+ if (ret)
+ return ret;
+
+ vf_token = true;
+ buf += UUID_STRING_LEN;
+ } else {
+ /* Unknown/duplicate option */
+ return -EINVAL;
+ }
+ }
+ }
+
+ ret = vfio_pci_validate_vf_token(vdev, vf_token, &uuid);
+ if (ret)
+ return ret;
+
+ return 1; /* Match */
+ }
+ EXPORT_SYMBOL_GPL(vfio_pci_core_match);
+
+ static int vfio_pci_bus_notifier(struct notifier_block *nb,
+ unsigned long action, void *data)
+ {
+ struct vfio_pci_core_device *vdev = container_of(nb,
+ struct vfio_pci_core_device, nb);
+ struct device *dev = data;
+ struct pci_dev *pdev = to_pci_dev(dev);
+ struct pci_dev *physfn = pci_physfn(pdev);
+
+ if (action == BUS_NOTIFY_ADD_DEVICE &&
+ pdev->is_virtfn && physfn == vdev->pdev) {
+ pci_info(vdev->pdev, "Captured SR-IOV VF %s driver_override\n",
+ pci_name(pdev));
+ pdev->driver_override = kasprintf(GFP_KERNEL, "%s",
+ vdev->vdev.ops->name);
+ } else if (action == BUS_NOTIFY_BOUND_DRIVER &&
+ pdev->is_virtfn && physfn == vdev->pdev) {
+ struct pci_driver *drv = pci_dev_driver(pdev);
+
+ if (drv && drv != pci_dev_driver(vdev->pdev))
+ pci_warn(vdev->pdev,
+ "VF %s bound to driver %s while PF bound to driver %s\n",
+ pci_name(pdev), drv->name,
+ pci_dev_driver(vdev->pdev)->name);
+ }
+
+ return 0;
+ }
+
+ static int vfio_pci_vf_init(struct vfio_pci_core_device *vdev)
+ {
+ struct pci_dev *pdev = vdev->pdev;
+ int ret;
+
+ if (!pdev->is_physfn)
+ return 0;
+
+ vdev->vf_token = kzalloc(sizeof(*vdev->vf_token), GFP_KERNEL);
+ if (!vdev->vf_token)
+ return -ENOMEM;
+
+ mutex_init(&vdev->vf_token->lock);
+ uuid_gen(&vdev->vf_token->uuid);
+
+ vdev->nb.notifier_call = vfio_pci_bus_notifier;
+ ret = bus_register_notifier(&pci_bus_type, &vdev->nb);
+ if (ret) {
+ kfree(vdev->vf_token);
+ return ret;
+ }
+ return 0;
+ }
+
+ static void vfio_pci_vf_uninit(struct vfio_pci_core_device *vdev)
+ {
+ if (!vdev->vf_token)
+ return;
+
+ bus_unregister_notifier(&pci_bus_type, &vdev->nb);
+ WARN_ON(vdev->vf_token->users);
+ mutex_destroy(&vdev->vf_token->lock);
+ kfree(vdev->vf_token);
+ }
+
+ static int vfio_pci_vga_init(struct vfio_pci_core_device *vdev)
+ {
+ struct pci_dev *pdev = vdev->pdev;
+ int ret;
+
+ if (!vfio_pci_is_vga(pdev))
+ return 0;
+
- vga_set_legacy_decoding(pdev, vfio_pci_set_vga_decode(vdev, false));
++ ret = vga_client_register(pdev, vfio_pci_set_decode);
+ if (ret)
+ return ret;
- vga_client_register(pdev, NULL, NULL, NULL);
++ vga_set_legacy_decoding(pdev, vfio_pci_set_decode(pdev, false));
+ return 0;
+ }
+
+ static void vfio_pci_vga_uninit(struct vfio_pci_core_device *vdev)
+ {
+ struct pci_dev *pdev = vdev->pdev;
+
+ if (!vfio_pci_is_vga(pdev))
+ return;
++ vga_client_unregister(pdev);
+ vga_set_legacy_decoding(pdev, VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM |
+ VGA_RSRC_LEGACY_IO |
+ VGA_RSRC_LEGACY_MEM);
+ }
+
+ void vfio_pci_core_init_device(struct vfio_pci_core_device *vdev,
+ struct pci_dev *pdev,
+ const struct vfio_device_ops *vfio_pci_ops)
+ {
+ vfio_init_group_dev(&vdev->vdev, &pdev->dev, vfio_pci_ops);
+ vdev->pdev = pdev;
+ vdev->irq_type = VFIO_PCI_NUM_IRQS;
+ mutex_init(&vdev->igate);
+ spin_lock_init(&vdev->irqlock);
+ mutex_init(&vdev->ioeventfds_lock);
+ INIT_LIST_HEAD(&vdev->dummy_resources_list);
+ INIT_LIST_HEAD(&vdev->ioeventfds_list);
+ mutex_init(&vdev->vma_lock);
+ INIT_LIST_HEAD(&vdev->vma_list);
+ init_rwsem(&vdev->memory_lock);
+ }
+ EXPORT_SYMBOL_GPL(vfio_pci_core_init_device);
+
+ void vfio_pci_core_uninit_device(struct vfio_pci_core_device *vdev)
+ {
+ mutex_destroy(&vdev->igate);
+ mutex_destroy(&vdev->ioeventfds_lock);
+ mutex_destroy(&vdev->vma_lock);
+ vfio_uninit_group_dev(&vdev->vdev);
+ kfree(vdev->region);
+ kfree(vdev->pm_save);
+ }
+ EXPORT_SYMBOL_GPL(vfio_pci_core_uninit_device);
+
+ int vfio_pci_core_register_device(struct vfio_pci_core_device *vdev)
+ {
+ struct pci_dev *pdev = vdev->pdev;
+ struct iommu_group *group;
+ int ret;
+
+ if (pdev->hdr_type != PCI_HEADER_TYPE_NORMAL)
+ return -EINVAL;
+
+ /*
+ * Prevent binding to PFs with VFs enabled, the VFs might be in use
+ * by the host or other users. We cannot capture the VFs if they
+ * already exist, nor can we track VF users. Disabling SR-IOV here
+ * would initiate removing the VFs, which would unbind the driver,
+ * which is prone to blocking if that VF is also in use by vfio-pci.
+ * Just reject these PFs and let the user sort it out.
+ */
+ if (pci_num_vf(pdev)) {
+ pci_warn(pdev, "Cannot bind to PF with SR-IOV enabled\n");
+ return -EBUSY;
+ }
+
+ group = vfio_iommu_group_get(&pdev->dev);
+ if (!group)
+ return -EINVAL;
+
+ if (pci_is_root_bus(pdev->bus)) {
+ ret = vfio_assign_device_set(&vdev->vdev, vdev);
+ } else if (!pci_probe_reset_slot(pdev->slot)) {
+ ret = vfio_assign_device_set(&vdev->vdev, pdev->slot);
+ } else {
+ /*
+ * If there is no slot reset support for this device, the whole
+ * bus needs to be grouped together to support bus-wide resets.
+ */
+ ret = vfio_assign_device_set(&vdev->vdev, pdev->bus);
+ }
+
+ if (ret)
+ goto out_group_put;
+ ret = vfio_pci_vf_init(vdev);
+ if (ret)
+ goto out_group_put;
+ ret = vfio_pci_vga_init(vdev);
+ if (ret)
+ goto out_vf;
+
+ vfio_pci_probe_power_state(vdev);
+
+ if (!disable_idle_d3) {
+ /*
+ * pci-core sets the device power state to an unknown value at
+ * bootup and after being removed from a driver. The only
+ * transition it allows from this unknown state is to D0, which
+ * typically happens when a driver calls pci_enable_device().
+ * We're not ready to enable the device yet, but we do want to
+ * be able to get to D3. Therefore first do a D0 transition
+ * before going to D3.
+ */
+ vfio_pci_set_power_state(vdev, PCI_D0);
+ vfio_pci_set_power_state(vdev, PCI_D3hot);
+ }
+
+ ret = vfio_register_group_dev(&vdev->vdev);
+ if (ret)
+ goto out_power;
+ return 0;
+
+ out_power:
+ if (!disable_idle_d3)
+ vfio_pci_set_power_state(vdev, PCI_D0);
+ out_vf:
+ vfio_pci_vf_uninit(vdev);
+ out_group_put:
+ vfio_iommu_group_put(group, &pdev->dev);
+ return ret;
+ }
+ EXPORT_SYMBOL_GPL(vfio_pci_core_register_device);
+
+ void vfio_pci_core_unregister_device(struct vfio_pci_core_device *vdev)
+ {
+ struct pci_dev *pdev = vdev->pdev;
+
+ pci_disable_sriov(pdev);
+
+ vfio_unregister_group_dev(&vdev->vdev);
+
+ vfio_pci_vf_uninit(vdev);
+ vfio_pci_vga_uninit(vdev);
+
+ vfio_iommu_group_put(pdev->dev.iommu_group, &pdev->dev);
+
+ if (!disable_idle_d3)
+ vfio_pci_set_power_state(vdev, PCI_D0);
+ }
+ EXPORT_SYMBOL_GPL(vfio_pci_core_unregister_device);
+
+ static pci_ers_result_t vfio_pci_aer_err_detected(struct pci_dev *pdev,
+ pci_channel_state_t state)
+ {
+ struct vfio_pci_core_device *vdev;
+ struct vfio_device *device;
+
+ device = vfio_device_get_from_dev(&pdev->dev);
+ if (device == NULL)
+ return PCI_ERS_RESULT_DISCONNECT;
+
+ vdev = container_of(device, struct vfio_pci_core_device, vdev);
+
+ mutex_lock(&vdev->igate);
+
+ if (vdev->err_trigger)
+ eventfd_signal(vdev->err_trigger, 1);
+
+ mutex_unlock(&vdev->igate);
+
+ vfio_device_put(device);
+
+ return PCI_ERS_RESULT_CAN_RECOVER;
+ }
+
+ int vfio_pci_core_sriov_configure(struct pci_dev *pdev, int nr_virtfn)
+ {
+ struct vfio_device *device;
+ int ret = 0;
+
+ device = vfio_device_get_from_dev(&pdev->dev);
+ if (!device)
+ return -ENODEV;
+
+ if (nr_virtfn == 0)
+ pci_disable_sriov(pdev);
+ else
+ ret = pci_enable_sriov(pdev, nr_virtfn);
+
+ vfio_device_put(device);
+
+ return ret < 0 ? ret : nr_virtfn;
+ }
+ EXPORT_SYMBOL_GPL(vfio_pci_core_sriov_configure);
+
+ const struct pci_error_handlers vfio_pci_core_err_handlers = {
+ .error_detected = vfio_pci_aer_err_detected,
+ };
+ EXPORT_SYMBOL_GPL(vfio_pci_core_err_handlers);
+
+ static bool vfio_dev_in_groups(struct vfio_pci_core_device *vdev,
+ struct vfio_pci_group_info *groups)
+ {
+ unsigned int i;
+
+ for (i = 0; i < groups->count; i++)
+ if (groups->groups[i] == vdev->vdev.group)
+ return true;
+ return false;
+ }
+
+ static int vfio_pci_is_device_in_set(struct pci_dev *pdev, void *data)
+ {
+ struct vfio_device_set *dev_set = data;
+ struct vfio_device *cur;
+
+ list_for_each_entry(cur, &dev_set->device_list, dev_set_list)
+ if (cur->dev == &pdev->dev)
+ return 0;
+ return -EBUSY;
+ }
+
+ /*
+ * vfio-core considers a group to be viable and will create a vfio_device even
+ * if some devices are bound to drivers like pci-stub or pcieport. Here we
+ * require all PCI devices to be inside our dev_set since that ensures they stay
+ * put and that every driver controlling the device can co-ordinate with the
+ * device reset.
+ *
+ * Returns the pci_dev to pass to pci_reset_bus() if every PCI device to be
+ * reset is inside the dev_set, and pci_reset_bus() can succeed. NULL otherwise.
+ */
+ static struct pci_dev *
+ vfio_pci_dev_set_resettable(struct vfio_device_set *dev_set)
+ {
+ struct pci_dev *pdev;
+
+ lockdep_assert_held(&dev_set->lock);
+
+ /*
+ * By definition all PCI devices in the dev_set share the same PCI
+ * reset, so any pci_dev will have the same outcomes for
+ * pci_probe_reset_*() and pci_reset_bus().
+ */
+ pdev = list_first_entry(&dev_set->device_list,
+ struct vfio_pci_core_device,
+ vdev.dev_set_list)->pdev;
+
+ /* pci_reset_bus() is supported */
+ if (pci_probe_reset_slot(pdev->slot) && pci_probe_reset_bus(pdev->bus))
+ return NULL;
+
+ if (vfio_pci_for_each_slot_or_bus(pdev, vfio_pci_is_device_in_set,
+ dev_set,
+ !pci_probe_reset_slot(pdev->slot)))
+ return NULL;
+ return pdev;
+ }
+
+ /*
+ * We need to get memory_lock for each device, but devices can share mmap_lock,
+ * therefore we need to zap and hold the vma_lock for each device, and only then
+ * get each memory_lock.
+ */
+ static int vfio_pci_dev_set_hot_reset(struct vfio_device_set *dev_set,
+ struct vfio_pci_group_info *groups)
+ {
+ struct vfio_pci_core_device *cur_mem;
+ struct vfio_pci_core_device *cur_vma;
+ struct vfio_pci_core_device *cur;
+ struct pci_dev *pdev;
+ bool is_mem = true;
+ int ret;
+
+ mutex_lock(&dev_set->lock);
+ cur_mem = list_first_entry(&dev_set->device_list,
+ struct vfio_pci_core_device,
+ vdev.dev_set_list);
+
+ pdev = vfio_pci_dev_set_resettable(dev_set);
+ if (!pdev) {
+ ret = -EINVAL;
+ goto err_unlock;
+ }
+
+ list_for_each_entry(cur_vma, &dev_set->device_list, vdev.dev_set_list) {
+ /*
+ * Test whether all the affected devices are contained by the
+ * set of groups provided by the user.
+ */
+ if (!vfio_dev_in_groups(cur_vma, groups)) {
+ ret = -EINVAL;
+ goto err_undo;
+ }
+
+ /*
+ * Locking multiple devices is prone to deadlock, runaway and
+ * unwind if we hit contention.
+ */
+ if (!vfio_pci_zap_and_vma_lock(cur_vma, true)) {
+ ret = -EBUSY;
+ goto err_undo;
+ }
+ }
+ cur_vma = NULL;
+
+ list_for_each_entry(cur_mem, &dev_set->device_list, vdev.dev_set_list) {
+ if (!down_write_trylock(&cur_mem->memory_lock)) {
+ ret = -EBUSY;
+ goto err_undo;
+ }
+ mutex_unlock(&cur_mem->vma_lock);
+ }
+ cur_mem = NULL;
+
+ ret = pci_reset_bus(pdev);
+
+ err_undo:
+ list_for_each_entry(cur, &dev_set->device_list, vdev.dev_set_list) {
+ if (cur == cur_mem)
+ is_mem = false;
+ if (cur == cur_vma)
+ break;
+ if (is_mem)
+ up_write(&cur->memory_lock);
+ else
+ mutex_unlock(&cur->vma_lock);
+ }
+ err_unlock:
+ mutex_unlock(&dev_set->lock);
+ return ret;
+ }
+
+ static bool vfio_pci_dev_set_needs_reset(struct vfio_device_set *dev_set)
+ {
+ struct vfio_pci_core_device *cur;
+ bool needs_reset = false;
+
+ list_for_each_entry(cur, &dev_set->device_list, vdev.dev_set_list) {
+ /* No VFIO device in the set can have an open device FD */
+ if (cur->vdev.open_count)
+ return false;
+ needs_reset |= cur->needs_reset;
+ }
+ return needs_reset;
+ }
+
+ /*
+ * If a bus or slot reset is available for the provided dev_set and:
+ * - All of the devices affected by that bus or slot reset are unused
+ * - At least one of the affected devices is marked dirty via
+ * needs_reset (such as by lack of FLR support)
+ * Then attempt to perform that bus or slot reset.
+ * Returns true if the dev_set was reset.
+ */
+ static bool vfio_pci_dev_set_try_reset(struct vfio_device_set *dev_set)
+ {
+ struct vfio_pci_core_device *cur;
+ struct pci_dev *pdev;
+ int ret;
+
+ if (!vfio_pci_dev_set_needs_reset(dev_set))
+ return false;
+
+ pdev = vfio_pci_dev_set_resettable(dev_set);
+ if (!pdev)
+ return false;
+
+ ret = pci_reset_bus(pdev);
+ if (ret)
+ return false;
+
+ list_for_each_entry(cur, &dev_set->device_list, vdev.dev_set_list) {
+ cur->needs_reset = false;
+ if (!disable_idle_d3)
+ vfio_pci_set_power_state(cur, PCI_D3hot);
+ }
+ return true;
+ }
+
+ void vfio_pci_core_set_params(bool is_nointxmask, bool is_disable_vga,
+ bool is_disable_idle_d3)
+ {
+ nointxmask = is_nointxmask;
+ disable_vga = is_disable_vga;
+ disable_idle_d3 = is_disable_idle_d3;
+ }
+ EXPORT_SYMBOL_GPL(vfio_pci_core_set_params);
+
+ static void vfio_pci_core_cleanup(void)
+ {
+ vfio_pci_uninit_perm_bits();
+ }
+
+ static int __init vfio_pci_core_init(void)
+ {
+ /* Allocate shared config space permission data used by all devices */
+ return vfio_pci_init_perm_bits();
+ }
+
+ module_init(vfio_pci_core_init);
+ module_exit(vfio_pci_core_cleanup);
+
+ MODULE_LICENSE("GPL v2");
+ MODULE_AUTHOR(DRIVER_AUTHOR);
+ MODULE_DESCRIPTION(DRIVER_DESC);
projects / linux-2.6-microblaze.git / commitdiff