1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2007-2010 Advanced Micro Devices, Inc.
4 * Author: Joerg Roedel <jroedel@suse.de>
5 * Leo Duran <leo.duran@amd.com>
8 #define pr_fmt(fmt) "AMD-Vi: " fmt
9 #define dev_fmt(fmt) pr_fmt(fmt)
11 #include <linux/pci.h>
12 #include <linux/acpi.h>
13 #include <linux/list.h>
14 #include <linux/bitmap.h>
15 #include <linux/slab.h>
16 #include <linux/syscore_ops.h>
17 #include <linux/interrupt.h>
18 #include <linux/msi.h>
19 #include <linux/amd-iommu.h>
20 #include <linux/export.h>
21 #include <linux/kmemleak.h>
22 #include <linux/mem_encrypt.h>
23 #include <asm/pci-direct.h>
24 #include <asm/iommu.h>
26 #include <asm/msidef.h>
28 #include <asm/x86_init.h>
29 #include <asm/iommu_table.h>
30 #include <asm/io_apic.h>
31 #include <asm/irq_remapping.h>
33 #include <linux/crash_dump.h>
35 #include "amd_iommu.h"
36 #include "../irq_remapping.h"
39 * definitions for the ACPI scanning code
41 #define IVRS_HEADER_LENGTH 48
43 #define ACPI_IVHD_TYPE_MAX_SUPPORTED 0x40
44 #define ACPI_IVMD_TYPE_ALL 0x20
45 #define ACPI_IVMD_TYPE 0x21
46 #define ACPI_IVMD_TYPE_RANGE 0x22
48 #define IVHD_DEV_ALL 0x01
49 #define IVHD_DEV_SELECT 0x02
50 #define IVHD_DEV_SELECT_RANGE_START 0x03
51 #define IVHD_DEV_RANGE_END 0x04
52 #define IVHD_DEV_ALIAS 0x42
53 #define IVHD_DEV_ALIAS_RANGE 0x43
54 #define IVHD_DEV_EXT_SELECT 0x46
55 #define IVHD_DEV_EXT_SELECT_RANGE 0x47
56 #define IVHD_DEV_SPECIAL 0x48
57 #define IVHD_DEV_ACPI_HID 0xf0
59 #define UID_NOT_PRESENT 0
60 #define UID_IS_INTEGER 1
61 #define UID_IS_CHARACTER 2
63 #define IVHD_SPECIAL_IOAPIC 1
64 #define IVHD_SPECIAL_HPET 2
66 #define IVHD_FLAG_HT_TUN_EN_MASK 0x01
67 #define IVHD_FLAG_PASSPW_EN_MASK 0x02
68 #define IVHD_FLAG_RESPASSPW_EN_MASK 0x04
69 #define IVHD_FLAG_ISOC_EN_MASK 0x08
71 #define IVMD_FLAG_EXCL_RANGE 0x08
72 #define IVMD_FLAG_IW 0x04
73 #define IVMD_FLAG_IR 0x02
74 #define IVMD_FLAG_UNITY_MAP 0x01
76 #define ACPI_DEVFLAG_INITPASS 0x01
77 #define ACPI_DEVFLAG_EXTINT 0x02
78 #define ACPI_DEVFLAG_NMI 0x04
79 #define ACPI_DEVFLAG_SYSMGT1 0x10
80 #define ACPI_DEVFLAG_SYSMGT2 0x20
81 #define ACPI_DEVFLAG_LINT0 0x40
82 #define ACPI_DEVFLAG_LINT1 0x80
83 #define ACPI_DEVFLAG_ATSDIS 0x10000000
85 #define LOOP_TIMEOUT 100000
87 * ACPI table definitions
89 * These data structures are laid over the table to parse the important values
93 extern const struct iommu_ops amd_iommu_ops;
96 * structure describing one IOMMU in the ACPI table. Typically followed by one
97 * or more ivhd_entrys.
110 /* Following only valid on IVHD type 11h and 40h */
111 u64 efr_reg; /* Exact copy of MMIO_EXT_FEATURES */
113 } __attribute__((packed));
116 * A device entry describing which devices a specific IOMMU translates and
117 * which requestor ids they use.
129 } __attribute__((packed));
132 * An AMD IOMMU memory definition structure. It defines things like exclusion
133 * ranges for devices and regions that should be unity mapped.
144 } __attribute__((packed));
147 bool amd_iommu_irq_remap __read_mostly;
149 int amd_iommu_guest_ir = AMD_IOMMU_GUEST_IR_VAPIC;
150 static int amd_iommu_xt_mode = IRQ_REMAP_XAPIC_MODE;
152 static bool amd_iommu_detected;
153 static bool __initdata amd_iommu_disabled;
154 static int amd_iommu_target_ivhd_type;
156 u16 amd_iommu_last_bdf; /* largest PCI device id we have
158 LIST_HEAD(amd_iommu_unity_map); /* a list of required unity mappings
160 bool amd_iommu_unmap_flush; /* if true, flush on every unmap */
162 LIST_HEAD(amd_iommu_list); /* list of all AMD IOMMUs in the
165 /* Array to assign indices to IOMMUs*/
166 struct amd_iommu *amd_iommus[MAX_IOMMUS];
168 /* Number of IOMMUs present in the system */
169 static int amd_iommus_present;
171 /* IOMMUs have a non-present cache? */
172 bool amd_iommu_np_cache __read_mostly;
173 bool amd_iommu_iotlb_sup __read_mostly = true;
175 u32 amd_iommu_max_pasid __read_mostly = ~0;
177 bool amd_iommu_v2_present __read_mostly;
178 static bool amd_iommu_pc_present __read_mostly;
180 bool amd_iommu_force_isolation __read_mostly;
183 * Pointer to the device table which is shared by all AMD IOMMUs
184 * it is indexed by the PCI device id or the HT unit id and contains
185 * information about the domain the device belongs to as well as the
186 * page table root pointer.
188 struct dev_table_entry *amd_iommu_dev_table;
190 * Pointer to a device table which the content of old device table
191 * will be copied to. It's only be used in kdump kernel.
193 static struct dev_table_entry *old_dev_tbl_cpy;
196 * The alias table is a driver specific data structure which contains the
197 * mappings of the PCI device ids to the actual requestor ids on the IOMMU.
198 * More than one device can share the same requestor id.
200 u16 *amd_iommu_alias_table;
203 * The rlookup table is used to find the IOMMU which is responsible
204 * for a specific device. It is also indexed by the PCI device id.
206 struct amd_iommu **amd_iommu_rlookup_table;
207 EXPORT_SYMBOL(amd_iommu_rlookup_table);
210 * This table is used to find the irq remapping table for a given device id
213 struct irq_remap_table **irq_lookup_table;
216 * AMD IOMMU allows up to 2^16 different protection domains. This is a bitmap
217 * to know which ones are already in use.
219 unsigned long *amd_iommu_pd_alloc_bitmap;
221 static u32 dev_table_size; /* size of the device table */
222 static u32 alias_table_size; /* size of the alias table */
223 static u32 rlookup_table_size; /* size if the rlookup table */
225 enum iommu_init_state {
236 IOMMU_CMDLINE_DISABLED,
239 /* Early ioapic and hpet maps from kernel command line */
240 #define EARLY_MAP_SIZE 4
241 static struct devid_map __initdata early_ioapic_map[EARLY_MAP_SIZE];
242 static struct devid_map __initdata early_hpet_map[EARLY_MAP_SIZE];
243 static struct acpihid_map_entry __initdata early_acpihid_map[EARLY_MAP_SIZE];
245 static int __initdata early_ioapic_map_size;
246 static int __initdata early_hpet_map_size;
247 static int __initdata early_acpihid_map_size;
249 static bool __initdata cmdline_maps;
251 static enum iommu_init_state init_state = IOMMU_START_STATE;
253 static int amd_iommu_enable_interrupts(void);
254 static int __init iommu_go_to_state(enum iommu_init_state state);
255 static void init_device_table_dma(void);
257 static bool amd_iommu_pre_enabled = true;
259 bool translation_pre_enabled(struct amd_iommu *iommu)
261 return (iommu->flags & AMD_IOMMU_FLAG_TRANS_PRE_ENABLED);
263 EXPORT_SYMBOL(translation_pre_enabled);
265 static void clear_translation_pre_enabled(struct amd_iommu *iommu)
267 iommu->flags &= ~AMD_IOMMU_FLAG_TRANS_PRE_ENABLED;
270 static void init_translation_status(struct amd_iommu *iommu)
274 ctrl = readq(iommu->mmio_base + MMIO_CONTROL_OFFSET);
275 if (ctrl & (1<<CONTROL_IOMMU_EN))
276 iommu->flags |= AMD_IOMMU_FLAG_TRANS_PRE_ENABLED;
279 static inline void update_last_devid(u16 devid)
281 if (devid > amd_iommu_last_bdf)
282 amd_iommu_last_bdf = devid;
285 static inline unsigned long tbl_size(int entry_size)
287 unsigned shift = PAGE_SHIFT +
288 get_order(((int)amd_iommu_last_bdf + 1) * entry_size);
293 int amd_iommu_get_num_iommus(void)
295 return amd_iommus_present;
298 /* Access to l1 and l2 indexed register spaces */
300 static u32 iommu_read_l1(struct amd_iommu *iommu, u16 l1, u8 address)
304 pci_write_config_dword(iommu->dev, 0xf8, (address | l1 << 16));
305 pci_read_config_dword(iommu->dev, 0xfc, &val);
309 static void iommu_write_l1(struct amd_iommu *iommu, u16 l1, u8 address, u32 val)
311 pci_write_config_dword(iommu->dev, 0xf8, (address | l1 << 16 | 1 << 31));
312 pci_write_config_dword(iommu->dev, 0xfc, val);
313 pci_write_config_dword(iommu->dev, 0xf8, (address | l1 << 16));
316 static u32 iommu_read_l2(struct amd_iommu *iommu, u8 address)
320 pci_write_config_dword(iommu->dev, 0xf0, address);
321 pci_read_config_dword(iommu->dev, 0xf4, &val);
325 static void iommu_write_l2(struct amd_iommu *iommu, u8 address, u32 val)
327 pci_write_config_dword(iommu->dev, 0xf0, (address | 1 << 8));
328 pci_write_config_dword(iommu->dev, 0xf4, val);
331 /****************************************************************************
333 * AMD IOMMU MMIO register space handling functions
335 * These functions are used to program the IOMMU device registers in
336 * MMIO space required for that driver.
338 ****************************************************************************/
341 * This function set the exclusion range in the IOMMU. DMA accesses to the
342 * exclusion range are passed through untranslated
344 static void iommu_set_exclusion_range(struct amd_iommu *iommu)
346 u64 start = iommu->exclusion_start & PAGE_MASK;
347 u64 limit = (start + iommu->exclusion_length - 1) & PAGE_MASK;
350 if (!iommu->exclusion_start)
353 entry = start | MMIO_EXCL_ENABLE_MASK;
354 memcpy_toio(iommu->mmio_base + MMIO_EXCL_BASE_OFFSET,
355 &entry, sizeof(entry));
358 memcpy_toio(iommu->mmio_base + MMIO_EXCL_LIMIT_OFFSET,
359 &entry, sizeof(entry));
362 /* Programs the physical address of the device table into the IOMMU hardware */
363 static void iommu_set_device_table(struct amd_iommu *iommu)
367 BUG_ON(iommu->mmio_base == NULL);
369 entry = iommu_virt_to_phys(amd_iommu_dev_table);
370 entry |= (dev_table_size >> 12) - 1;
371 memcpy_toio(iommu->mmio_base + MMIO_DEV_TABLE_OFFSET,
372 &entry, sizeof(entry));
375 /* Generic functions to enable/disable certain features of the IOMMU. */
376 static void iommu_feature_enable(struct amd_iommu *iommu, u8 bit)
380 ctrl = readq(iommu->mmio_base + MMIO_CONTROL_OFFSET);
381 ctrl |= (1ULL << bit);
382 writeq(ctrl, iommu->mmio_base + MMIO_CONTROL_OFFSET);
385 static void iommu_feature_disable(struct amd_iommu *iommu, u8 bit)
389 ctrl = readq(iommu->mmio_base + MMIO_CONTROL_OFFSET);
390 ctrl &= ~(1ULL << bit);
391 writeq(ctrl, iommu->mmio_base + MMIO_CONTROL_OFFSET);
394 static void iommu_set_inv_tlb_timeout(struct amd_iommu *iommu, int timeout)
398 ctrl = readq(iommu->mmio_base + MMIO_CONTROL_OFFSET);
399 ctrl &= ~CTRL_INV_TO_MASK;
400 ctrl |= (timeout << CONTROL_INV_TIMEOUT) & CTRL_INV_TO_MASK;
401 writeq(ctrl, iommu->mmio_base + MMIO_CONTROL_OFFSET);
404 /* Function to enable the hardware */
405 static void iommu_enable(struct amd_iommu *iommu)
407 iommu_feature_enable(iommu, CONTROL_IOMMU_EN);
410 static void iommu_disable(struct amd_iommu *iommu)
412 if (!iommu->mmio_base)
415 /* Disable command buffer */
416 iommu_feature_disable(iommu, CONTROL_CMDBUF_EN);
418 /* Disable event logging and event interrupts */
419 iommu_feature_disable(iommu, CONTROL_EVT_INT_EN);
420 iommu_feature_disable(iommu, CONTROL_EVT_LOG_EN);
422 /* Disable IOMMU GA_LOG */
423 iommu_feature_disable(iommu, CONTROL_GALOG_EN);
424 iommu_feature_disable(iommu, CONTROL_GAINT_EN);
426 /* Disable IOMMU hardware itself */
427 iommu_feature_disable(iommu, CONTROL_IOMMU_EN);
431 * mapping and unmapping functions for the IOMMU MMIO space. Each AMD IOMMU in
432 * the system has one.
434 static u8 __iomem * __init iommu_map_mmio_space(u64 address, u64 end)
436 if (!request_mem_region(address, end, "amd_iommu")) {
437 pr_err("Can not reserve memory region %llx-%llx for mmio\n",
439 pr_err("This is a BIOS bug. Please contact your hardware vendor\n");
443 return (u8 __iomem *)ioremap(address, end);
446 static void __init iommu_unmap_mmio_space(struct amd_iommu *iommu)
448 if (iommu->mmio_base)
449 iounmap(iommu->mmio_base);
450 release_mem_region(iommu->mmio_phys, iommu->mmio_phys_end);
453 static inline u32 get_ivhd_header_size(struct ivhd_header *h)
469 /****************************************************************************
471 * The functions below belong to the first pass of AMD IOMMU ACPI table
472 * parsing. In this pass we try to find out the highest device id this
473 * code has to handle. Upon this information the size of the shared data
474 * structures is determined later.
476 ****************************************************************************/
479 * This function calculates the length of a given IVHD entry
481 static inline int ivhd_entry_length(u8 *ivhd)
483 u32 type = ((struct ivhd_entry *)ivhd)->type;
486 return 0x04 << (*ivhd >> 6);
487 } else if (type == IVHD_DEV_ACPI_HID) {
488 /* For ACPI_HID, offset 21 is uid len */
489 return *((u8 *)ivhd + 21) + 22;
495 * After reading the highest device id from the IOMMU PCI capability header
496 * this function looks if there is a higher device id defined in the ACPI table
498 static int __init find_last_devid_from_ivhd(struct ivhd_header *h)
500 u8 *p = (void *)h, *end = (void *)h;
501 struct ivhd_entry *dev;
503 u32 ivhd_size = get_ivhd_header_size(h);
506 pr_err("Unsupported IVHD type %#x\n", h->type);
514 dev = (struct ivhd_entry *)p;
517 /* Use maximum BDF value for DEV_ALL */
518 update_last_devid(0xffff);
520 case IVHD_DEV_SELECT:
521 case IVHD_DEV_RANGE_END:
523 case IVHD_DEV_EXT_SELECT:
524 /* all the above subfield types refer to device ids */
525 update_last_devid(dev->devid);
530 p += ivhd_entry_length(p);
538 static int __init check_ivrs_checksum(struct acpi_table_header *table)
541 u8 checksum = 0, *p = (u8 *)table;
543 for (i = 0; i < table->length; ++i)
546 /* ACPI table corrupt */
547 pr_err(FW_BUG "IVRS invalid checksum\n");
555 * Iterate over all IVHD entries in the ACPI table and find the highest device
556 * id which we need to handle. This is the first of three functions which parse
557 * the ACPI table. So we check the checksum here.
559 static int __init find_last_devid_acpi(struct acpi_table_header *table)
561 u8 *p = (u8 *)table, *end = (u8 *)table;
562 struct ivhd_header *h;
564 p += IVRS_HEADER_LENGTH;
566 end += table->length;
568 h = (struct ivhd_header *)p;
569 if (h->type == amd_iommu_target_ivhd_type) {
570 int ret = find_last_devid_from_ivhd(h);
582 /****************************************************************************
584 * The following functions belong to the code path which parses the ACPI table
585 * the second time. In this ACPI parsing iteration we allocate IOMMU specific
586 * data structures, initialize the device/alias/rlookup table and also
587 * basically initialize the hardware.
589 ****************************************************************************/
592 * Allocates the command buffer. This buffer is per AMD IOMMU. We can
593 * write commands to that buffer later and the IOMMU will execute them
596 static int __init alloc_command_buffer(struct amd_iommu *iommu)
598 iommu->cmd_buf = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
599 get_order(CMD_BUFFER_SIZE));
601 return iommu->cmd_buf ? 0 : -ENOMEM;
605 * This function resets the command buffer if the IOMMU stopped fetching
608 void amd_iommu_reset_cmd_buffer(struct amd_iommu *iommu)
610 iommu_feature_disable(iommu, CONTROL_CMDBUF_EN);
612 writel(0x00, iommu->mmio_base + MMIO_CMD_HEAD_OFFSET);
613 writel(0x00, iommu->mmio_base + MMIO_CMD_TAIL_OFFSET);
614 iommu->cmd_buf_head = 0;
615 iommu->cmd_buf_tail = 0;
617 iommu_feature_enable(iommu, CONTROL_CMDBUF_EN);
621 * This function writes the command buffer address to the hardware and
624 static void iommu_enable_command_buffer(struct amd_iommu *iommu)
628 BUG_ON(iommu->cmd_buf == NULL);
630 entry = iommu_virt_to_phys(iommu->cmd_buf);
631 entry |= MMIO_CMD_SIZE_512;
633 memcpy_toio(iommu->mmio_base + MMIO_CMD_BUF_OFFSET,
634 &entry, sizeof(entry));
636 amd_iommu_reset_cmd_buffer(iommu);
640 * This function disables the command buffer
642 static void iommu_disable_command_buffer(struct amd_iommu *iommu)
644 iommu_feature_disable(iommu, CONTROL_CMDBUF_EN);
647 static void __init free_command_buffer(struct amd_iommu *iommu)
649 free_pages((unsigned long)iommu->cmd_buf, get_order(CMD_BUFFER_SIZE));
652 /* allocates the memory where the IOMMU will log its events to */
653 static int __init alloc_event_buffer(struct amd_iommu *iommu)
655 iommu->evt_buf = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
656 get_order(EVT_BUFFER_SIZE));
658 return iommu->evt_buf ? 0 : -ENOMEM;
661 static void iommu_enable_event_buffer(struct amd_iommu *iommu)
665 BUG_ON(iommu->evt_buf == NULL);
667 entry = iommu_virt_to_phys(iommu->evt_buf) | EVT_LEN_MASK;
669 memcpy_toio(iommu->mmio_base + MMIO_EVT_BUF_OFFSET,
670 &entry, sizeof(entry));
672 /* set head and tail to zero manually */
673 writel(0x00, iommu->mmio_base + MMIO_EVT_HEAD_OFFSET);
674 writel(0x00, iommu->mmio_base + MMIO_EVT_TAIL_OFFSET);
676 iommu_feature_enable(iommu, CONTROL_EVT_LOG_EN);
680 * This function disables the event log buffer
682 static void iommu_disable_event_buffer(struct amd_iommu *iommu)
684 iommu_feature_disable(iommu, CONTROL_EVT_LOG_EN);
687 static void __init free_event_buffer(struct amd_iommu *iommu)
689 free_pages((unsigned long)iommu->evt_buf, get_order(EVT_BUFFER_SIZE));
692 /* allocates the memory where the IOMMU will log its events to */
693 static int __init alloc_ppr_log(struct amd_iommu *iommu)
695 iommu->ppr_log = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
696 get_order(PPR_LOG_SIZE));
698 return iommu->ppr_log ? 0 : -ENOMEM;
701 static void iommu_enable_ppr_log(struct amd_iommu *iommu)
705 if (iommu->ppr_log == NULL)
708 entry = iommu_virt_to_phys(iommu->ppr_log) | PPR_LOG_SIZE_512;
710 memcpy_toio(iommu->mmio_base + MMIO_PPR_LOG_OFFSET,
711 &entry, sizeof(entry));
713 /* set head and tail to zero manually */
714 writel(0x00, iommu->mmio_base + MMIO_PPR_HEAD_OFFSET);
715 writel(0x00, iommu->mmio_base + MMIO_PPR_TAIL_OFFSET);
717 iommu_feature_enable(iommu, CONTROL_PPRLOG_EN);
718 iommu_feature_enable(iommu, CONTROL_PPR_EN);
721 static void __init free_ppr_log(struct amd_iommu *iommu)
723 free_pages((unsigned long)iommu->ppr_log, get_order(PPR_LOG_SIZE));
726 static void free_ga_log(struct amd_iommu *iommu)
728 #ifdef CONFIG_IRQ_REMAP
729 free_pages((unsigned long)iommu->ga_log, get_order(GA_LOG_SIZE));
730 free_pages((unsigned long)iommu->ga_log_tail, get_order(8));
734 static int iommu_ga_log_enable(struct amd_iommu *iommu)
736 #ifdef CONFIG_IRQ_REMAP
742 status = readl(iommu->mmio_base + MMIO_STATUS_OFFSET);
744 /* Check if already running */
745 if (status & (MMIO_STATUS_GALOG_RUN_MASK))
748 iommu_feature_enable(iommu, CONTROL_GAINT_EN);
749 iommu_feature_enable(iommu, CONTROL_GALOG_EN);
751 for (i = 0; i < LOOP_TIMEOUT; ++i) {
752 status = readl(iommu->mmio_base + MMIO_STATUS_OFFSET);
753 if (status & (MMIO_STATUS_GALOG_RUN_MASK))
757 if (i >= LOOP_TIMEOUT)
759 #endif /* CONFIG_IRQ_REMAP */
763 #ifdef CONFIG_IRQ_REMAP
764 static int iommu_init_ga_log(struct amd_iommu *iommu)
768 if (!AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir))
771 iommu->ga_log = (u8 *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
772 get_order(GA_LOG_SIZE));
776 iommu->ga_log_tail = (u8 *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
778 if (!iommu->ga_log_tail)
781 entry = iommu_virt_to_phys(iommu->ga_log) | GA_LOG_SIZE_512;
782 memcpy_toio(iommu->mmio_base + MMIO_GA_LOG_BASE_OFFSET,
783 &entry, sizeof(entry));
784 entry = (iommu_virt_to_phys(iommu->ga_log_tail) &
785 (BIT_ULL(52)-1)) & ~7ULL;
786 memcpy_toio(iommu->mmio_base + MMIO_GA_LOG_TAIL_OFFSET,
787 &entry, sizeof(entry));
788 writel(0x00, iommu->mmio_base + MMIO_GA_HEAD_OFFSET);
789 writel(0x00, iommu->mmio_base + MMIO_GA_TAIL_OFFSET);
796 #endif /* CONFIG_IRQ_REMAP */
798 static int iommu_init_ga(struct amd_iommu *iommu)
802 #ifdef CONFIG_IRQ_REMAP
803 /* Note: We have already checked GASup from IVRS table.
804 * Now, we need to make sure that GAMSup is set.
806 if (AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir) &&
807 !iommu_feature(iommu, FEATURE_GAM_VAPIC))
808 amd_iommu_guest_ir = AMD_IOMMU_GUEST_IR_LEGACY_GA;
810 ret = iommu_init_ga_log(iommu);
811 #endif /* CONFIG_IRQ_REMAP */
816 static void iommu_enable_xt(struct amd_iommu *iommu)
818 #ifdef CONFIG_IRQ_REMAP
820 * XT mode (32-bit APIC destination ID) requires
821 * GA mode (128-bit IRTE support) as a prerequisite.
823 if (AMD_IOMMU_GUEST_IR_GA(amd_iommu_guest_ir) &&
824 amd_iommu_xt_mode == IRQ_REMAP_X2APIC_MODE)
825 iommu_feature_enable(iommu, CONTROL_XT_EN);
826 #endif /* CONFIG_IRQ_REMAP */
829 static void iommu_enable_gt(struct amd_iommu *iommu)
831 if (!iommu_feature(iommu, FEATURE_GT))
834 iommu_feature_enable(iommu, CONTROL_GT_EN);
837 /* sets a specific bit in the device table entry. */
838 static void set_dev_entry_bit(u16 devid, u8 bit)
840 int i = (bit >> 6) & 0x03;
841 int _bit = bit & 0x3f;
843 amd_iommu_dev_table[devid].data[i] |= (1UL << _bit);
846 static int get_dev_entry_bit(u16 devid, u8 bit)
848 int i = (bit >> 6) & 0x03;
849 int _bit = bit & 0x3f;
851 return (amd_iommu_dev_table[devid].data[i] & (1UL << _bit)) >> _bit;
855 static bool copy_device_table(void)
857 u64 int_ctl, int_tab_len, entry = 0, last_entry = 0;
858 struct dev_table_entry *old_devtb = NULL;
859 u32 lo, hi, devid, old_devtb_size;
860 phys_addr_t old_devtb_phys;
861 struct amd_iommu *iommu;
862 u16 dom_id, dte_v, irq_v;
866 if (!amd_iommu_pre_enabled)
869 pr_warn("Translation is already enabled - trying to copy translation structures\n");
870 for_each_iommu(iommu) {
871 /* All IOMMUs should use the same device table with the same size */
872 lo = readl(iommu->mmio_base + MMIO_DEV_TABLE_OFFSET);
873 hi = readl(iommu->mmio_base + MMIO_DEV_TABLE_OFFSET + 4);
874 entry = (((u64) hi) << 32) + lo;
875 if (last_entry && last_entry != entry) {
876 pr_err("IOMMU:%d should use the same dev table as others!\n",
882 old_devtb_size = ((entry & ~PAGE_MASK) + 1) << 12;
883 if (old_devtb_size != dev_table_size) {
884 pr_err("The device table size of IOMMU:%d is not expected!\n",
891 * When SME is enabled in the first kernel, the entry includes the
892 * memory encryption mask(sme_me_mask), we must remove the memory
893 * encryption mask to obtain the true physical address in kdump kernel.
895 old_devtb_phys = __sme_clr(entry) & PAGE_MASK;
897 if (old_devtb_phys >= 0x100000000ULL) {
898 pr_err("The address of old device table is above 4G, not trustworthy!\n");
901 old_devtb = (sme_active() && is_kdump_kernel())
902 ? (__force void *)ioremap_encrypted(old_devtb_phys,
904 : memremap(old_devtb_phys, dev_table_size, MEMREMAP_WB);
909 gfp_flag = GFP_KERNEL | __GFP_ZERO | GFP_DMA32;
910 old_dev_tbl_cpy = (void *)__get_free_pages(gfp_flag,
911 get_order(dev_table_size));
912 if (old_dev_tbl_cpy == NULL) {
913 pr_err("Failed to allocate memory for copying old device table!\n");
917 for (devid = 0; devid <= amd_iommu_last_bdf; ++devid) {
918 old_dev_tbl_cpy[devid] = old_devtb[devid];
919 dom_id = old_devtb[devid].data[1] & DEV_DOMID_MASK;
920 dte_v = old_devtb[devid].data[0] & DTE_FLAG_V;
922 if (dte_v && dom_id) {
923 old_dev_tbl_cpy[devid].data[0] = old_devtb[devid].data[0];
924 old_dev_tbl_cpy[devid].data[1] = old_devtb[devid].data[1];
925 __set_bit(dom_id, amd_iommu_pd_alloc_bitmap);
926 /* If gcr3 table existed, mask it out */
927 if (old_devtb[devid].data[0] & DTE_FLAG_GV) {
928 tmp = DTE_GCR3_VAL_B(~0ULL) << DTE_GCR3_SHIFT_B;
929 tmp |= DTE_GCR3_VAL_C(~0ULL) << DTE_GCR3_SHIFT_C;
930 old_dev_tbl_cpy[devid].data[1] &= ~tmp;
931 tmp = DTE_GCR3_VAL_A(~0ULL) << DTE_GCR3_SHIFT_A;
933 old_dev_tbl_cpy[devid].data[0] &= ~tmp;
937 irq_v = old_devtb[devid].data[2] & DTE_IRQ_REMAP_ENABLE;
938 int_ctl = old_devtb[devid].data[2] & DTE_IRQ_REMAP_INTCTL_MASK;
939 int_tab_len = old_devtb[devid].data[2] & DTE_IRQ_TABLE_LEN_MASK;
940 if (irq_v && (int_ctl || int_tab_len)) {
941 if ((int_ctl != DTE_IRQ_REMAP_INTCTL) ||
942 (int_tab_len != DTE_IRQ_TABLE_LEN)) {
943 pr_err("Wrong old irq remapping flag: %#x\n", devid);
947 old_dev_tbl_cpy[devid].data[2] = old_devtb[devid].data[2];
955 void amd_iommu_apply_erratum_63(u16 devid)
959 sysmgt = get_dev_entry_bit(devid, DEV_ENTRY_SYSMGT1) |
960 (get_dev_entry_bit(devid, DEV_ENTRY_SYSMGT2) << 1);
963 set_dev_entry_bit(devid, DEV_ENTRY_IW);
966 /* Writes the specific IOMMU for a device into the rlookup table */
967 static void __init set_iommu_for_device(struct amd_iommu *iommu, u16 devid)
969 amd_iommu_rlookup_table[devid] = iommu;
973 * This function takes the device specific flags read from the ACPI
974 * table and sets up the device table entry with that information
976 static void __init set_dev_entry_from_acpi(struct amd_iommu *iommu,
977 u16 devid, u32 flags, u32 ext_flags)
979 if (flags & ACPI_DEVFLAG_INITPASS)
980 set_dev_entry_bit(devid, DEV_ENTRY_INIT_PASS);
981 if (flags & ACPI_DEVFLAG_EXTINT)
982 set_dev_entry_bit(devid, DEV_ENTRY_EINT_PASS);
983 if (flags & ACPI_DEVFLAG_NMI)
984 set_dev_entry_bit(devid, DEV_ENTRY_NMI_PASS);
985 if (flags & ACPI_DEVFLAG_SYSMGT1)
986 set_dev_entry_bit(devid, DEV_ENTRY_SYSMGT1);
987 if (flags & ACPI_DEVFLAG_SYSMGT2)
988 set_dev_entry_bit(devid, DEV_ENTRY_SYSMGT2);
989 if (flags & ACPI_DEVFLAG_LINT0)
990 set_dev_entry_bit(devid, DEV_ENTRY_LINT0_PASS);
991 if (flags & ACPI_DEVFLAG_LINT1)
992 set_dev_entry_bit(devid, DEV_ENTRY_LINT1_PASS);
994 amd_iommu_apply_erratum_63(devid);
996 set_iommu_for_device(iommu, devid);
999 int __init add_special_device(u8 type, u8 id, u16 *devid, bool cmd_line)
1001 struct devid_map *entry;
1002 struct list_head *list;
1004 if (type == IVHD_SPECIAL_IOAPIC)
1006 else if (type == IVHD_SPECIAL_HPET)
1011 list_for_each_entry(entry, list, list) {
1012 if (!(entry->id == id && entry->cmd_line))
1015 pr_info("Command-line override present for %s id %d - ignoring\n",
1016 type == IVHD_SPECIAL_IOAPIC ? "IOAPIC" : "HPET", id);
1018 *devid = entry->devid;
1023 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
1028 entry->devid = *devid;
1029 entry->cmd_line = cmd_line;
1031 list_add_tail(&entry->list, list);
1036 static int __init add_acpi_hid_device(u8 *hid, u8 *uid, u16 *devid,
1039 struct acpihid_map_entry *entry;
1040 struct list_head *list = &acpihid_map;
1042 list_for_each_entry(entry, list, list) {
1043 if (strcmp(entry->hid, hid) ||
1044 (*uid && *entry->uid && strcmp(entry->uid, uid)) ||
1048 pr_info("Command-line override for hid:%s uid:%s\n",
1050 *devid = entry->devid;
1054 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
1058 memcpy(entry->uid, uid, strlen(uid));
1059 memcpy(entry->hid, hid, strlen(hid));
1060 entry->devid = *devid;
1061 entry->cmd_line = cmd_line;
1062 entry->root_devid = (entry->devid & (~0x7));
1064 pr_info("%s, add hid:%s, uid:%s, rdevid:%d\n",
1065 entry->cmd_line ? "cmd" : "ivrs",
1066 entry->hid, entry->uid, entry->root_devid);
1068 list_add_tail(&entry->list, list);
1072 static int __init add_early_maps(void)
1076 for (i = 0; i < early_ioapic_map_size; ++i) {
1077 ret = add_special_device(IVHD_SPECIAL_IOAPIC,
1078 early_ioapic_map[i].id,
1079 &early_ioapic_map[i].devid,
1080 early_ioapic_map[i].cmd_line);
1085 for (i = 0; i < early_hpet_map_size; ++i) {
1086 ret = add_special_device(IVHD_SPECIAL_HPET,
1087 early_hpet_map[i].id,
1088 &early_hpet_map[i].devid,
1089 early_hpet_map[i].cmd_line);
1094 for (i = 0; i < early_acpihid_map_size; ++i) {
1095 ret = add_acpi_hid_device(early_acpihid_map[i].hid,
1096 early_acpihid_map[i].uid,
1097 &early_acpihid_map[i].devid,
1098 early_acpihid_map[i].cmd_line);
1107 * Reads the device exclusion range from ACPI and initializes the IOMMU with
1110 static void __init set_device_exclusion_range(u16 devid, struct ivmd_header *m)
1112 if (!(m->flags & IVMD_FLAG_EXCL_RANGE))
1116 * Treat per-device exclusion ranges as r/w unity-mapped regions
1117 * since some buggy BIOSes might lead to the overwritten exclusion
1118 * range (exclusion_start and exclusion_length members). This
1119 * happens when there are multiple exclusion ranges (IVMD entries)
1120 * defined in ACPI table.
1122 m->flags = (IVMD_FLAG_IW | IVMD_FLAG_IR | IVMD_FLAG_UNITY_MAP);
1126 * Takes a pointer to an AMD IOMMU entry in the ACPI table and
1127 * initializes the hardware and our data structures with it.
1129 static int __init init_iommu_from_acpi(struct amd_iommu *iommu,
1130 struct ivhd_header *h)
1133 u8 *end = p, flags = 0;
1134 u16 devid = 0, devid_start = 0, devid_to = 0;
1135 u32 dev_i, ext_flags = 0;
1137 struct ivhd_entry *e;
1142 ret = add_early_maps();
1146 amd_iommu_apply_ivrs_quirks();
1149 * First save the recommended feature enable bits from ACPI
1151 iommu->acpi_flags = h->flags;
1154 * Done. Now parse the device entries
1156 ivhd_size = get_ivhd_header_size(h);
1158 pr_err("Unsupported IVHD type %#x\n", h->type);
1168 e = (struct ivhd_entry *)p;
1172 DUMP_printk(" DEV_ALL\t\t\tflags: %02x\n", e->flags);
1174 for (dev_i = 0; dev_i <= amd_iommu_last_bdf; ++dev_i)
1175 set_dev_entry_from_acpi(iommu, dev_i, e->flags, 0);
1177 case IVHD_DEV_SELECT:
1179 DUMP_printk(" DEV_SELECT\t\t\t devid: %02x:%02x.%x "
1181 PCI_BUS_NUM(e->devid),
1187 set_dev_entry_from_acpi(iommu, devid, e->flags, 0);
1189 case IVHD_DEV_SELECT_RANGE_START:
1191 DUMP_printk(" DEV_SELECT_RANGE_START\t "
1192 "devid: %02x:%02x.%x flags: %02x\n",
1193 PCI_BUS_NUM(e->devid),
1198 devid_start = e->devid;
1203 case IVHD_DEV_ALIAS:
1205 DUMP_printk(" DEV_ALIAS\t\t\t devid: %02x:%02x.%x "
1206 "flags: %02x devid_to: %02x:%02x.%x\n",
1207 PCI_BUS_NUM(e->devid),
1211 PCI_BUS_NUM(e->ext >> 8),
1212 PCI_SLOT(e->ext >> 8),
1213 PCI_FUNC(e->ext >> 8));
1216 devid_to = e->ext >> 8;
1217 set_dev_entry_from_acpi(iommu, devid , e->flags, 0);
1218 set_dev_entry_from_acpi(iommu, devid_to, e->flags, 0);
1219 amd_iommu_alias_table[devid] = devid_to;
1221 case IVHD_DEV_ALIAS_RANGE:
1223 DUMP_printk(" DEV_ALIAS_RANGE\t\t "
1224 "devid: %02x:%02x.%x flags: %02x "
1225 "devid_to: %02x:%02x.%x\n",
1226 PCI_BUS_NUM(e->devid),
1230 PCI_BUS_NUM(e->ext >> 8),
1231 PCI_SLOT(e->ext >> 8),
1232 PCI_FUNC(e->ext >> 8));
1234 devid_start = e->devid;
1236 devid_to = e->ext >> 8;
1240 case IVHD_DEV_EXT_SELECT:
1242 DUMP_printk(" DEV_EXT_SELECT\t\t devid: %02x:%02x.%x "
1243 "flags: %02x ext: %08x\n",
1244 PCI_BUS_NUM(e->devid),
1250 set_dev_entry_from_acpi(iommu, devid, e->flags,
1253 case IVHD_DEV_EXT_SELECT_RANGE:
1255 DUMP_printk(" DEV_EXT_SELECT_RANGE\t devid: "
1256 "%02x:%02x.%x flags: %02x ext: %08x\n",
1257 PCI_BUS_NUM(e->devid),
1262 devid_start = e->devid;
1267 case IVHD_DEV_RANGE_END:
1269 DUMP_printk(" DEV_RANGE_END\t\t devid: %02x:%02x.%x\n",
1270 PCI_BUS_NUM(e->devid),
1272 PCI_FUNC(e->devid));
1275 for (dev_i = devid_start; dev_i <= devid; ++dev_i) {
1277 amd_iommu_alias_table[dev_i] = devid_to;
1278 set_dev_entry_from_acpi(iommu,
1279 devid_to, flags, ext_flags);
1281 set_dev_entry_from_acpi(iommu, dev_i,
1285 case IVHD_DEV_SPECIAL: {
1291 handle = e->ext & 0xff;
1292 devid = (e->ext >> 8) & 0xffff;
1293 type = (e->ext >> 24) & 0xff;
1295 if (type == IVHD_SPECIAL_IOAPIC)
1297 else if (type == IVHD_SPECIAL_HPET)
1302 DUMP_printk(" DEV_SPECIAL(%s[%d])\t\tdevid: %02x:%02x.%x\n",
1308 ret = add_special_device(type, handle, &devid, false);
1313 * add_special_device might update the devid in case a
1314 * command-line override is present. So call
1315 * set_dev_entry_from_acpi after add_special_device.
1317 set_dev_entry_from_acpi(iommu, devid, e->flags, 0);
1321 case IVHD_DEV_ACPI_HID: {
1323 u8 hid[ACPIHID_HID_LEN];
1324 u8 uid[ACPIHID_UID_LEN];
1327 if (h->type != 0x40) {
1328 pr_err(FW_BUG "Invalid IVHD device type %#x\n",
1333 memcpy(hid, (u8 *)(&e->ext), ACPIHID_HID_LEN - 1);
1334 hid[ACPIHID_HID_LEN - 1] = '\0';
1337 pr_err(FW_BUG "Invalid HID.\n");
1343 case UID_NOT_PRESENT:
1346 pr_warn(FW_BUG "Invalid UID length.\n");
1349 case UID_IS_INTEGER:
1351 sprintf(uid, "%d", e->uid);
1354 case UID_IS_CHARACTER:
1356 memcpy(uid, &e->uid, e->uidl);
1357 uid[e->uidl] = '\0';
1365 DUMP_printk(" DEV_ACPI_HID(%s[%s])\t\tdevid: %02x:%02x.%x\n",
1373 ret = add_acpi_hid_device(hid, uid, &devid, false);
1378 * add_special_device might update the devid in case a
1379 * command-line override is present. So call
1380 * set_dev_entry_from_acpi after add_special_device.
1382 set_dev_entry_from_acpi(iommu, devid, e->flags, 0);
1390 p += ivhd_entry_length(p);
1396 static void __init free_iommu_one(struct amd_iommu *iommu)
1398 free_command_buffer(iommu);
1399 free_event_buffer(iommu);
1400 free_ppr_log(iommu);
1402 iommu_unmap_mmio_space(iommu);
1405 static void __init free_iommu_all(void)
1407 struct amd_iommu *iommu, *next;
1409 for_each_iommu_safe(iommu, next) {
1410 list_del(&iommu->list);
1411 free_iommu_one(iommu);
1417 * Family15h Model 10h-1fh erratum 746 (IOMMU Logging May Stall Translations)
1419 * BIOS should disable L2B micellaneous clock gating by setting
1420 * L2_L2B_CK_GATE_CONTROL[CKGateL2BMiscDisable](D0F2xF4_x90[2]) = 1b
1422 static void amd_iommu_erratum_746_workaround(struct amd_iommu *iommu)
1426 if ((boot_cpu_data.x86 != 0x15) ||
1427 (boot_cpu_data.x86_model < 0x10) ||
1428 (boot_cpu_data.x86_model > 0x1f))
1431 pci_write_config_dword(iommu->dev, 0xf0, 0x90);
1432 pci_read_config_dword(iommu->dev, 0xf4, &value);
1437 /* Select NB indirect register 0x90 and enable writing */
1438 pci_write_config_dword(iommu->dev, 0xf0, 0x90 | (1 << 8));
1440 pci_write_config_dword(iommu->dev, 0xf4, value | 0x4);
1441 pci_info(iommu->dev, "Applying erratum 746 workaround\n");
1443 /* Clear the enable writing bit */
1444 pci_write_config_dword(iommu->dev, 0xf0, 0x90);
1448 * Family15h Model 30h-3fh (IOMMU Mishandles ATS Write Permission)
1450 * BIOS should enable ATS write permission check by setting
1451 * L2_DEBUG_3[AtsIgnoreIWDis](D0F2xF4_x47[0]) = 1b
1453 static void amd_iommu_ats_write_check_workaround(struct amd_iommu *iommu)
1457 if ((boot_cpu_data.x86 != 0x15) ||
1458 (boot_cpu_data.x86_model < 0x30) ||
1459 (boot_cpu_data.x86_model > 0x3f))
1462 /* Test L2_DEBUG_3[AtsIgnoreIWDis] == 1 */
1463 value = iommu_read_l2(iommu, 0x47);
1468 /* Set L2_DEBUG_3[AtsIgnoreIWDis] = 1 */
1469 iommu_write_l2(iommu, 0x47, value | BIT(0));
1471 pci_info(iommu->dev, "Applying ATS write check workaround\n");
1475 * This function clues the initialization function for one IOMMU
1476 * together and also allocates the command buffer and programs the
1477 * hardware. It does NOT enable the IOMMU. This is done afterwards.
1479 static int __init init_iommu_one(struct amd_iommu *iommu, struct ivhd_header *h)
1483 raw_spin_lock_init(&iommu->lock);
1485 /* Add IOMMU to internal data structures */
1486 list_add_tail(&iommu->list, &amd_iommu_list);
1487 iommu->index = amd_iommus_present++;
1489 if (unlikely(iommu->index >= MAX_IOMMUS)) {
1490 WARN(1, "System has more IOMMUs than supported by this driver\n");
1494 /* Index is fine - add IOMMU to the array */
1495 amd_iommus[iommu->index] = iommu;
1498 * Copy data from ACPI table entry to the iommu struct
1500 iommu->devid = h->devid;
1501 iommu->cap_ptr = h->cap_ptr;
1502 iommu->pci_seg = h->pci_seg;
1503 iommu->mmio_phys = h->mmio_phys;
1507 /* Check if IVHD EFR contains proper max banks/counters */
1508 if ((h->efr_attr != 0) &&
1509 ((h->efr_attr & (0xF << 13)) != 0) &&
1510 ((h->efr_attr & (0x3F << 17)) != 0))
1511 iommu->mmio_phys_end = MMIO_REG_END_OFFSET;
1513 iommu->mmio_phys_end = MMIO_CNTR_CONF_OFFSET;
1516 * Note: GA (128-bit IRTE) mode requires cmpxchg16b supports.
1517 * GAM also requires GA mode. Therefore, we need to
1518 * check cmpxchg16b support before enabling it.
1520 if (!boot_cpu_has(X86_FEATURE_CX16) ||
1521 ((h->efr_attr & (0x1 << IOMMU_FEAT_GASUP_SHIFT)) == 0))
1522 amd_iommu_guest_ir = AMD_IOMMU_GUEST_IR_LEGACY;
1526 if (h->efr_reg & (1 << 9))
1527 iommu->mmio_phys_end = MMIO_REG_END_OFFSET;
1529 iommu->mmio_phys_end = MMIO_CNTR_CONF_OFFSET;
1532 * Note: GA (128-bit IRTE) mode requires cmpxchg16b supports.
1533 * XT, GAM also requires GA mode. Therefore, we need to
1534 * check cmpxchg16b support before enabling them.
1536 if (!boot_cpu_has(X86_FEATURE_CX16) ||
1537 ((h->efr_reg & (0x1 << IOMMU_EFR_GASUP_SHIFT)) == 0)) {
1538 amd_iommu_guest_ir = AMD_IOMMU_GUEST_IR_LEGACY;
1543 * Note: Since iommu_update_intcapxt() leverages
1544 * the IOMMU MMIO access to MSI capability block registers
1545 * for MSI address lo/hi/data, we need to check both
1546 * EFR[XtSup] and EFR[MsiCapMmioSup] for x2APIC support.
1548 if ((h->efr_reg & BIT(IOMMU_EFR_XTSUP_SHIFT)) &&
1549 (h->efr_reg & BIT(IOMMU_EFR_MSICAPMMIOSUP_SHIFT)))
1550 amd_iommu_xt_mode = IRQ_REMAP_X2APIC_MODE;
1556 iommu->mmio_base = iommu_map_mmio_space(iommu->mmio_phys,
1557 iommu->mmio_phys_end);
1558 if (!iommu->mmio_base)
1561 if (alloc_command_buffer(iommu))
1564 if (alloc_event_buffer(iommu))
1567 iommu->int_enabled = false;
1569 init_translation_status(iommu);
1570 if (translation_pre_enabled(iommu) && !is_kdump_kernel()) {
1571 iommu_disable(iommu);
1572 clear_translation_pre_enabled(iommu);
1573 pr_warn("Translation was enabled for IOMMU:%d but we are not in kdump mode\n",
1576 if (amd_iommu_pre_enabled)
1577 amd_iommu_pre_enabled = translation_pre_enabled(iommu);
1579 ret = init_iommu_from_acpi(iommu, h);
1583 ret = amd_iommu_create_irq_domain(iommu);
1588 * Make sure IOMMU is not considered to translate itself. The IVRS
1589 * table tells us so, but this is a lie!
1591 amd_iommu_rlookup_table[iommu->devid] = NULL;
1597 * get_highest_supported_ivhd_type - Look up the appropriate IVHD type
1598 * @ivrs Pointer to the IVRS header
1600 * This function search through all IVDB of the maximum supported IVHD
1602 static u8 get_highest_supported_ivhd_type(struct acpi_table_header *ivrs)
1604 u8 *base = (u8 *)ivrs;
1605 struct ivhd_header *ivhd = (struct ivhd_header *)
1606 (base + IVRS_HEADER_LENGTH);
1607 u8 last_type = ivhd->type;
1608 u16 devid = ivhd->devid;
1610 while (((u8 *)ivhd - base < ivrs->length) &&
1611 (ivhd->type <= ACPI_IVHD_TYPE_MAX_SUPPORTED)) {
1612 u8 *p = (u8 *) ivhd;
1614 if (ivhd->devid == devid)
1615 last_type = ivhd->type;
1616 ivhd = (struct ivhd_header *)(p + ivhd->length);
1623 * Iterates over all IOMMU entries in the ACPI table, allocates the
1624 * IOMMU structure and initializes it with init_iommu_one()
1626 static int __init init_iommu_all(struct acpi_table_header *table)
1628 u8 *p = (u8 *)table, *end = (u8 *)table;
1629 struct ivhd_header *h;
1630 struct amd_iommu *iommu;
1633 end += table->length;
1634 p += IVRS_HEADER_LENGTH;
1637 h = (struct ivhd_header *)p;
1638 if (*p == amd_iommu_target_ivhd_type) {
1640 DUMP_printk("device: %02x:%02x.%01x cap: %04x "
1641 "seg: %d flags: %01x info %04x\n",
1642 PCI_BUS_NUM(h->devid), PCI_SLOT(h->devid),
1643 PCI_FUNC(h->devid), h->cap_ptr,
1644 h->pci_seg, h->flags, h->info);
1645 DUMP_printk(" mmio-addr: %016llx\n",
1648 iommu = kzalloc(sizeof(struct amd_iommu), GFP_KERNEL);
1652 ret = init_iommu_one(iommu, h);
1664 static int iommu_pc_get_set_reg(struct amd_iommu *iommu, u8 bank, u8 cntr,
1665 u8 fxn, u64 *value, bool is_write);
1667 static void init_iommu_perf_ctr(struct amd_iommu *iommu)
1669 struct pci_dev *pdev = iommu->dev;
1670 u64 val = 0xabcd, val2 = 0, save_reg = 0;
1672 if (!iommu_feature(iommu, FEATURE_PC))
1675 amd_iommu_pc_present = true;
1677 /* save the value to restore, if writable */
1678 if (iommu_pc_get_set_reg(iommu, 0, 0, 0, &save_reg, false))
1681 /* Check if the performance counters can be written to */
1682 if ((iommu_pc_get_set_reg(iommu, 0, 0, 0, &val, true)) ||
1683 (iommu_pc_get_set_reg(iommu, 0, 0, 0, &val2, false)) ||
1688 if (iommu_pc_get_set_reg(iommu, 0, 0, 0, &save_reg, true))
1691 pci_info(pdev, "IOMMU performance counters supported\n");
1693 val = readl(iommu->mmio_base + MMIO_CNTR_CONF_OFFSET);
1694 iommu->max_banks = (u8) ((val >> 12) & 0x3f);
1695 iommu->max_counters = (u8) ((val >> 7) & 0xf);
1700 pci_err(pdev, "Unable to read/write to IOMMU perf counter.\n");
1701 amd_iommu_pc_present = false;
1705 static ssize_t amd_iommu_show_cap(struct device *dev,
1706 struct device_attribute *attr,
1709 struct amd_iommu *iommu = dev_to_amd_iommu(dev);
1710 return sprintf(buf, "%x\n", iommu->cap);
1712 static DEVICE_ATTR(cap, S_IRUGO, amd_iommu_show_cap, NULL);
1714 static ssize_t amd_iommu_show_features(struct device *dev,
1715 struct device_attribute *attr,
1718 struct amd_iommu *iommu = dev_to_amd_iommu(dev);
1719 return sprintf(buf, "%llx\n", iommu->features);
1721 static DEVICE_ATTR(features, S_IRUGO, amd_iommu_show_features, NULL);
1723 static struct attribute *amd_iommu_attrs[] = {
1725 &dev_attr_features.attr,
1729 static struct attribute_group amd_iommu_group = {
1730 .name = "amd-iommu",
1731 .attrs = amd_iommu_attrs,
1734 static const struct attribute_group *amd_iommu_groups[] = {
1739 static int __init iommu_init_pci(struct amd_iommu *iommu)
1741 int cap_ptr = iommu->cap_ptr;
1744 iommu->dev = pci_get_domain_bus_and_slot(0, PCI_BUS_NUM(iommu->devid),
1745 iommu->devid & 0xff);
1749 /* Prevent binding other PCI device drivers to IOMMU devices */
1750 iommu->dev->match_driver = false;
1752 pci_read_config_dword(iommu->dev, cap_ptr + MMIO_CAP_HDR_OFFSET,
1755 if (!(iommu->cap & (1 << IOMMU_CAP_IOTLB)))
1756 amd_iommu_iotlb_sup = false;
1758 /* read extended feature bits */
1759 iommu->features = readq(iommu->mmio_base + MMIO_EXT_FEATURES);
1761 if (iommu_feature(iommu, FEATURE_GT)) {
1766 pasmax = iommu->features & FEATURE_PASID_MASK;
1767 pasmax >>= FEATURE_PASID_SHIFT;
1768 max_pasid = (1 << (pasmax + 1)) - 1;
1770 amd_iommu_max_pasid = min(amd_iommu_max_pasid, max_pasid);
1772 BUG_ON(amd_iommu_max_pasid & ~PASID_MASK);
1774 glxval = iommu->features & FEATURE_GLXVAL_MASK;
1775 glxval >>= FEATURE_GLXVAL_SHIFT;
1777 if (amd_iommu_max_glx_val == -1)
1778 amd_iommu_max_glx_val = glxval;
1780 amd_iommu_max_glx_val = min(amd_iommu_max_glx_val, glxval);
1783 if (iommu_feature(iommu, FEATURE_GT) &&
1784 iommu_feature(iommu, FEATURE_PPR)) {
1785 iommu->is_iommu_v2 = true;
1786 amd_iommu_v2_present = true;
1789 if (iommu_feature(iommu, FEATURE_PPR) && alloc_ppr_log(iommu))
1792 ret = iommu_init_ga(iommu);
1796 if (iommu->cap & (1UL << IOMMU_CAP_NPCACHE))
1797 amd_iommu_np_cache = true;
1799 init_iommu_perf_ctr(iommu);
1801 if (is_rd890_iommu(iommu->dev)) {
1805 pci_get_domain_bus_and_slot(0, iommu->dev->bus->number,
1809 * Some rd890 systems may not be fully reconfigured by the
1810 * BIOS, so it's necessary for us to store this information so
1811 * it can be reprogrammed on resume
1813 pci_read_config_dword(iommu->dev, iommu->cap_ptr + 4,
1814 &iommu->stored_addr_lo);
1815 pci_read_config_dword(iommu->dev, iommu->cap_ptr + 8,
1816 &iommu->stored_addr_hi);
1818 /* Low bit locks writes to configuration space */
1819 iommu->stored_addr_lo &= ~1;
1821 for (i = 0; i < 6; i++)
1822 for (j = 0; j < 0x12; j++)
1823 iommu->stored_l1[i][j] = iommu_read_l1(iommu, i, j);
1825 for (i = 0; i < 0x83; i++)
1826 iommu->stored_l2[i] = iommu_read_l2(iommu, i);
1829 amd_iommu_erratum_746_workaround(iommu);
1830 amd_iommu_ats_write_check_workaround(iommu);
1832 iommu_device_sysfs_add(&iommu->iommu, &iommu->dev->dev,
1833 amd_iommu_groups, "ivhd%d", iommu->index);
1834 iommu_device_set_ops(&iommu->iommu, &amd_iommu_ops);
1835 iommu_device_register(&iommu->iommu);
1837 return pci_enable_device(iommu->dev);
1840 static void print_iommu_info(void)
1842 static const char * const feat_str[] = {
1843 "PreF", "PPR", "X2APIC", "NX", "GT", "[5]",
1844 "IA", "GA", "HE", "PC"
1846 struct amd_iommu *iommu;
1848 for_each_iommu(iommu) {
1849 struct pci_dev *pdev = iommu->dev;
1852 pci_info(pdev, "Found IOMMU cap 0x%hx\n", iommu->cap_ptr);
1854 if (iommu->cap & (1 << IOMMU_CAP_EFR)) {
1855 pci_info(pdev, "Extended features (%#llx):",
1857 for (i = 0; i < ARRAY_SIZE(feat_str); ++i) {
1858 if (iommu_feature(iommu, (1ULL << i)))
1859 pr_cont(" %s", feat_str[i]);
1862 if (iommu->features & FEATURE_GAM_VAPIC)
1863 pr_cont(" GA_vAPIC");
1868 if (irq_remapping_enabled) {
1869 pr_info("Interrupt remapping enabled\n");
1870 if (AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir))
1871 pr_info("Virtual APIC enabled\n");
1872 if (amd_iommu_xt_mode == IRQ_REMAP_X2APIC_MODE)
1873 pr_info("X2APIC enabled\n");
1877 static int __init amd_iommu_init_pci(void)
1879 struct amd_iommu *iommu;
1882 for_each_iommu(iommu) {
1883 ret = iommu_init_pci(iommu);
1889 * Order is important here to make sure any unity map requirements are
1890 * fulfilled. The unity mappings are created and written to the device
1891 * table during the amd_iommu_init_api() call.
1893 * After that we call init_device_table_dma() to make sure any
1894 * uninitialized DTE will block DMA, and in the end we flush the caches
1895 * of all IOMMUs to make sure the changes to the device table are
1898 ret = amd_iommu_init_api();
1900 init_device_table_dma();
1902 for_each_iommu(iommu)
1903 iommu_flush_all_caches(iommu);
1911 /****************************************************************************
1913 * The following functions initialize the MSI interrupts for all IOMMUs
1914 * in the system. It's a bit challenging because there could be multiple
1915 * IOMMUs per PCI BDF but we can call pci_enable_msi(x) only once per
1918 ****************************************************************************/
1920 static int iommu_setup_msi(struct amd_iommu *iommu)
1924 r = pci_enable_msi(iommu->dev);
1928 r = request_threaded_irq(iommu->dev->irq,
1929 amd_iommu_int_handler,
1930 amd_iommu_int_thread,
1935 pci_disable_msi(iommu->dev);
1939 iommu->int_enabled = true;
1944 #define XT_INT_DEST_MODE(x) (((x) & 0x1ULL) << 2)
1945 #define XT_INT_DEST_LO(x) (((x) & 0xFFFFFFULL) << 8)
1946 #define XT_INT_VEC(x) (((x) & 0xFFULL) << 32)
1947 #define XT_INT_DEST_HI(x) ((((x) >> 24) & 0xFFULL) << 56)
1950 * Setup the IntCapXT registers with interrupt routing information
1951 * based on the PCI MSI capability block registers, accessed via
1952 * MMIO MSI address low/hi and MSI data registers.
1954 static void iommu_update_intcapxt(struct amd_iommu *iommu)
1957 u32 addr_lo = readl(iommu->mmio_base + MMIO_MSI_ADDR_LO_OFFSET);
1958 u32 addr_hi = readl(iommu->mmio_base + MMIO_MSI_ADDR_HI_OFFSET);
1959 u32 data = readl(iommu->mmio_base + MMIO_MSI_DATA_OFFSET);
1960 bool dm = (addr_lo >> MSI_ADDR_DEST_MODE_SHIFT) & 0x1;
1961 u32 dest = ((addr_lo >> MSI_ADDR_DEST_ID_SHIFT) & 0xFF);
1963 if (x2apic_enabled())
1964 dest |= MSI_ADDR_EXT_DEST_ID(addr_hi);
1966 val = XT_INT_VEC(data & 0xFF) |
1967 XT_INT_DEST_MODE(dm) |
1968 XT_INT_DEST_LO(dest) |
1969 XT_INT_DEST_HI(dest);
1972 * Current IOMMU implemtation uses the same IRQ for all
1973 * 3 IOMMU interrupts.
1975 writeq(val, iommu->mmio_base + MMIO_INTCAPXT_EVT_OFFSET);
1976 writeq(val, iommu->mmio_base + MMIO_INTCAPXT_PPR_OFFSET);
1977 writeq(val, iommu->mmio_base + MMIO_INTCAPXT_GALOG_OFFSET);
1980 static void _irq_notifier_notify(struct irq_affinity_notify *notify,
1981 const cpumask_t *mask)
1983 struct amd_iommu *iommu;
1985 for_each_iommu(iommu) {
1986 if (iommu->dev->irq == notify->irq) {
1987 iommu_update_intcapxt(iommu);
1993 static void _irq_notifier_release(struct kref *ref)
1997 static int iommu_init_intcapxt(struct amd_iommu *iommu)
2000 struct irq_affinity_notify *notify = &iommu->intcapxt_notify;
2003 * IntCapXT requires XTSup=1 and MsiCapMmioSup=1,
2004 * which can be inferred from amd_iommu_xt_mode.
2006 if (amd_iommu_xt_mode != IRQ_REMAP_X2APIC_MODE)
2010 * Also, we need to setup notifier to update the IntCapXT registers
2011 * whenever the irq affinity is changed from user-space.
2013 notify->irq = iommu->dev->irq;
2014 notify->notify = _irq_notifier_notify,
2015 notify->release = _irq_notifier_release,
2016 ret = irq_set_affinity_notifier(iommu->dev->irq, notify);
2018 pr_err("Failed to register irq affinity notifier (devid=%#x, irq %d)\n",
2019 iommu->devid, iommu->dev->irq);
2023 iommu_update_intcapxt(iommu);
2024 iommu_feature_enable(iommu, CONTROL_INTCAPXT_EN);
2028 static int iommu_init_msi(struct amd_iommu *iommu)
2032 if (iommu->int_enabled)
2035 if (iommu->dev->msi_cap)
2036 ret = iommu_setup_msi(iommu);
2044 ret = iommu_init_intcapxt(iommu);
2048 iommu_feature_enable(iommu, CONTROL_EVT_INT_EN);
2050 if (iommu->ppr_log != NULL)
2051 iommu_feature_enable(iommu, CONTROL_PPRINT_EN);
2053 iommu_ga_log_enable(iommu);
2058 /****************************************************************************
2060 * The next functions belong to the third pass of parsing the ACPI
2061 * table. In this last pass the memory mapping requirements are
2062 * gathered (like exclusion and unity mapping ranges).
2064 ****************************************************************************/
2066 static void __init free_unity_maps(void)
2068 struct unity_map_entry *entry, *next;
2070 list_for_each_entry_safe(entry, next, &amd_iommu_unity_map, list) {
2071 list_del(&entry->list);
2076 /* called when we find an exclusion range definition in ACPI */
2077 static int __init init_exclusion_range(struct ivmd_header *m)
2082 case ACPI_IVMD_TYPE:
2083 set_device_exclusion_range(m->devid, m);
2085 case ACPI_IVMD_TYPE_ALL:
2086 for (i = 0; i <= amd_iommu_last_bdf; ++i)
2087 set_device_exclusion_range(i, m);
2089 case ACPI_IVMD_TYPE_RANGE:
2090 for (i = m->devid; i <= m->aux; ++i)
2091 set_device_exclusion_range(i, m);
2100 /* called for unity map ACPI definition */
2101 static int __init init_unity_map_range(struct ivmd_header *m)
2103 struct unity_map_entry *e = NULL;
2106 e = kzalloc(sizeof(*e), GFP_KERNEL);
2110 if (m->flags & IVMD_FLAG_EXCL_RANGE)
2111 init_exclusion_range(m);
2117 case ACPI_IVMD_TYPE:
2118 s = "IVMD_TYPEi\t\t\t";
2119 e->devid_start = e->devid_end = m->devid;
2121 case ACPI_IVMD_TYPE_ALL:
2122 s = "IVMD_TYPE_ALL\t\t";
2124 e->devid_end = amd_iommu_last_bdf;
2126 case ACPI_IVMD_TYPE_RANGE:
2127 s = "IVMD_TYPE_RANGE\t\t";
2128 e->devid_start = m->devid;
2129 e->devid_end = m->aux;
2132 e->address_start = PAGE_ALIGN(m->range_start);
2133 e->address_end = e->address_start + PAGE_ALIGN(m->range_length);
2134 e->prot = m->flags >> 1;
2136 DUMP_printk("%s devid_start: %02x:%02x.%x devid_end: %02x:%02x.%x"
2137 " range_start: %016llx range_end: %016llx flags: %x\n", s,
2138 PCI_BUS_NUM(e->devid_start), PCI_SLOT(e->devid_start),
2139 PCI_FUNC(e->devid_start), PCI_BUS_NUM(e->devid_end),
2140 PCI_SLOT(e->devid_end), PCI_FUNC(e->devid_end),
2141 e->address_start, e->address_end, m->flags);
2143 list_add_tail(&e->list, &amd_iommu_unity_map);
2148 /* iterates over all memory definitions we find in the ACPI table */
2149 static int __init init_memory_definitions(struct acpi_table_header *table)
2151 u8 *p = (u8 *)table, *end = (u8 *)table;
2152 struct ivmd_header *m;
2154 end += table->length;
2155 p += IVRS_HEADER_LENGTH;
2158 m = (struct ivmd_header *)p;
2159 if (m->flags & (IVMD_FLAG_UNITY_MAP | IVMD_FLAG_EXCL_RANGE))
2160 init_unity_map_range(m);
2169 * Init the device table to not allow DMA access for devices
2171 static void init_device_table_dma(void)
2175 for (devid = 0; devid <= amd_iommu_last_bdf; ++devid) {
2176 set_dev_entry_bit(devid, DEV_ENTRY_VALID);
2177 set_dev_entry_bit(devid, DEV_ENTRY_TRANSLATION);
2181 static void __init uninit_device_table_dma(void)
2185 for (devid = 0; devid <= amd_iommu_last_bdf; ++devid) {
2186 amd_iommu_dev_table[devid].data[0] = 0ULL;
2187 amd_iommu_dev_table[devid].data[1] = 0ULL;
2191 static void init_device_table(void)
2195 if (!amd_iommu_irq_remap)
2198 for (devid = 0; devid <= amd_iommu_last_bdf; ++devid)
2199 set_dev_entry_bit(devid, DEV_ENTRY_IRQ_TBL_EN);
2202 static void iommu_init_flags(struct amd_iommu *iommu)
2204 iommu->acpi_flags & IVHD_FLAG_HT_TUN_EN_MASK ?
2205 iommu_feature_enable(iommu, CONTROL_HT_TUN_EN) :
2206 iommu_feature_disable(iommu, CONTROL_HT_TUN_EN);
2208 iommu->acpi_flags & IVHD_FLAG_PASSPW_EN_MASK ?
2209 iommu_feature_enable(iommu, CONTROL_PASSPW_EN) :
2210 iommu_feature_disable(iommu, CONTROL_PASSPW_EN);
2212 iommu->acpi_flags & IVHD_FLAG_RESPASSPW_EN_MASK ?
2213 iommu_feature_enable(iommu, CONTROL_RESPASSPW_EN) :
2214 iommu_feature_disable(iommu, CONTROL_RESPASSPW_EN);
2216 iommu->acpi_flags & IVHD_FLAG_ISOC_EN_MASK ?
2217 iommu_feature_enable(iommu, CONTROL_ISOC_EN) :
2218 iommu_feature_disable(iommu, CONTROL_ISOC_EN);
2221 * make IOMMU memory accesses cache coherent
2223 iommu_feature_enable(iommu, CONTROL_COHERENT_EN);
2225 /* Set IOTLB invalidation timeout to 1s */
2226 iommu_set_inv_tlb_timeout(iommu, CTRL_INV_TO_1S);
2229 static void iommu_apply_resume_quirks(struct amd_iommu *iommu)
2232 u32 ioc_feature_control;
2233 struct pci_dev *pdev = iommu->root_pdev;
2235 /* RD890 BIOSes may not have completely reconfigured the iommu */
2236 if (!is_rd890_iommu(iommu->dev) || !pdev)
2240 * First, we need to ensure that the iommu is enabled. This is
2241 * controlled by a register in the northbridge
2244 /* Select Northbridge indirect register 0x75 and enable writing */
2245 pci_write_config_dword(pdev, 0x60, 0x75 | (1 << 7));
2246 pci_read_config_dword(pdev, 0x64, &ioc_feature_control);
2248 /* Enable the iommu */
2249 if (!(ioc_feature_control & 0x1))
2250 pci_write_config_dword(pdev, 0x64, ioc_feature_control | 1);
2252 /* Restore the iommu BAR */
2253 pci_write_config_dword(iommu->dev, iommu->cap_ptr + 4,
2254 iommu->stored_addr_lo);
2255 pci_write_config_dword(iommu->dev, iommu->cap_ptr + 8,
2256 iommu->stored_addr_hi);
2258 /* Restore the l1 indirect regs for each of the 6 l1s */
2259 for (i = 0; i < 6; i++)
2260 for (j = 0; j < 0x12; j++)
2261 iommu_write_l1(iommu, i, j, iommu->stored_l1[i][j]);
2263 /* Restore the l2 indirect regs */
2264 for (i = 0; i < 0x83; i++)
2265 iommu_write_l2(iommu, i, iommu->stored_l2[i]);
2267 /* Lock PCI setup registers */
2268 pci_write_config_dword(iommu->dev, iommu->cap_ptr + 4,
2269 iommu->stored_addr_lo | 1);
2272 static void iommu_enable_ga(struct amd_iommu *iommu)
2274 #ifdef CONFIG_IRQ_REMAP
2275 switch (amd_iommu_guest_ir) {
2276 case AMD_IOMMU_GUEST_IR_VAPIC:
2277 iommu_feature_enable(iommu, CONTROL_GAM_EN);
2279 case AMD_IOMMU_GUEST_IR_LEGACY_GA:
2280 iommu_feature_enable(iommu, CONTROL_GA_EN);
2281 iommu->irte_ops = &irte_128_ops;
2284 iommu->irte_ops = &irte_32_ops;
2290 static void early_enable_iommu(struct amd_iommu *iommu)
2292 iommu_disable(iommu);
2293 iommu_init_flags(iommu);
2294 iommu_set_device_table(iommu);
2295 iommu_enable_command_buffer(iommu);
2296 iommu_enable_event_buffer(iommu);
2297 iommu_set_exclusion_range(iommu);
2298 iommu_enable_ga(iommu);
2299 iommu_enable_xt(iommu);
2300 iommu_enable(iommu);
2301 iommu_flush_all_caches(iommu);
2305 * This function finally enables all IOMMUs found in the system after
2306 * they have been initialized.
2308 * Or if in kdump kernel and IOMMUs are all pre-enabled, try to copy
2309 * the old content of device table entries. Not this case or copy failed,
2310 * just continue as normal kernel does.
2312 static void early_enable_iommus(void)
2314 struct amd_iommu *iommu;
2317 if (!copy_device_table()) {
2319 * If come here because of failure in copying device table from old
2320 * kernel with all IOMMUs enabled, print error message and try to
2321 * free allocated old_dev_tbl_cpy.
2323 if (amd_iommu_pre_enabled)
2324 pr_err("Failed to copy DEV table from previous kernel.\n");
2325 if (old_dev_tbl_cpy != NULL)
2326 free_pages((unsigned long)old_dev_tbl_cpy,
2327 get_order(dev_table_size));
2329 for_each_iommu(iommu) {
2330 clear_translation_pre_enabled(iommu);
2331 early_enable_iommu(iommu);
2334 pr_info("Copied DEV table from previous kernel.\n");
2335 free_pages((unsigned long)amd_iommu_dev_table,
2336 get_order(dev_table_size));
2337 amd_iommu_dev_table = old_dev_tbl_cpy;
2338 for_each_iommu(iommu) {
2339 iommu_disable_command_buffer(iommu);
2340 iommu_disable_event_buffer(iommu);
2341 iommu_enable_command_buffer(iommu);
2342 iommu_enable_event_buffer(iommu);
2343 iommu_enable_ga(iommu);
2344 iommu_enable_xt(iommu);
2345 iommu_set_device_table(iommu);
2346 iommu_flush_all_caches(iommu);
2350 #ifdef CONFIG_IRQ_REMAP
2351 if (AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir))
2352 amd_iommu_irq_ops.capability |= (1 << IRQ_POSTING_CAP);
2356 static void enable_iommus_v2(void)
2358 struct amd_iommu *iommu;
2360 for_each_iommu(iommu) {
2361 iommu_enable_ppr_log(iommu);
2362 iommu_enable_gt(iommu);
2366 static void enable_iommus(void)
2368 early_enable_iommus();
2373 static void disable_iommus(void)
2375 struct amd_iommu *iommu;
2377 for_each_iommu(iommu)
2378 iommu_disable(iommu);
2380 #ifdef CONFIG_IRQ_REMAP
2381 if (AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir))
2382 amd_iommu_irq_ops.capability &= ~(1 << IRQ_POSTING_CAP);
2387 * Suspend/Resume support
2388 * disable suspend until real resume implemented
2391 static void amd_iommu_resume(void)
2393 struct amd_iommu *iommu;
2395 for_each_iommu(iommu)
2396 iommu_apply_resume_quirks(iommu);
2398 /* re-load the hardware */
2401 amd_iommu_enable_interrupts();
2404 static int amd_iommu_suspend(void)
2406 /* disable IOMMUs to go out of the way for BIOS */
2412 static struct syscore_ops amd_iommu_syscore_ops = {
2413 .suspend = amd_iommu_suspend,
2414 .resume = amd_iommu_resume,
2417 static void __init free_iommu_resources(void)
2419 kmemleak_free(irq_lookup_table);
2420 free_pages((unsigned long)irq_lookup_table,
2421 get_order(rlookup_table_size));
2422 irq_lookup_table = NULL;
2424 kmem_cache_destroy(amd_iommu_irq_cache);
2425 amd_iommu_irq_cache = NULL;
2427 free_pages((unsigned long)amd_iommu_rlookup_table,
2428 get_order(rlookup_table_size));
2429 amd_iommu_rlookup_table = NULL;
2431 free_pages((unsigned long)amd_iommu_alias_table,
2432 get_order(alias_table_size));
2433 amd_iommu_alias_table = NULL;
2435 free_pages((unsigned long)amd_iommu_dev_table,
2436 get_order(dev_table_size));
2437 amd_iommu_dev_table = NULL;
2442 /* SB IOAPIC is always on this device in AMD systems */
2443 #define IOAPIC_SB_DEVID ((0x00 << 8) | PCI_DEVFN(0x14, 0))
2445 static bool __init check_ioapic_information(void)
2447 const char *fw_bug = FW_BUG;
2448 bool ret, has_sb_ioapic;
2451 has_sb_ioapic = false;
2455 * If we have map overrides on the kernel command line the
2456 * messages in this function might not describe firmware bugs
2457 * anymore - so be careful
2462 for (idx = 0; idx < nr_ioapics; idx++) {
2463 int devid, id = mpc_ioapic_id(idx);
2465 devid = get_ioapic_devid(id);
2467 pr_err("%s: IOAPIC[%d] not in IVRS table\n",
2470 } else if (devid == IOAPIC_SB_DEVID) {
2471 has_sb_ioapic = true;
2476 if (!has_sb_ioapic) {
2478 * We expect the SB IOAPIC to be listed in the IVRS
2479 * table. The system timer is connected to the SB IOAPIC
2480 * and if we don't have it in the list the system will
2481 * panic at boot time. This situation usually happens
2482 * when the BIOS is buggy and provides us the wrong
2483 * device id for the IOAPIC in the system.
2485 pr_err("%s: No southbridge IOAPIC found\n", fw_bug);
2489 pr_err("Disabling interrupt remapping\n");
2494 static void __init free_dma_resources(void)
2496 free_pages((unsigned long)amd_iommu_pd_alloc_bitmap,
2497 get_order(MAX_DOMAIN_ID/8));
2498 amd_iommu_pd_alloc_bitmap = NULL;
2504 * This is the hardware init function for AMD IOMMU in the system.
2505 * This function is called either from amd_iommu_init or from the interrupt
2506 * remapping setup code.
2508 * This function basically parses the ACPI table for AMD IOMMU (IVRS)
2511 * 1 pass) Discover the most comprehensive IVHD type to use.
2513 * 2 pass) Find the highest PCI device id the driver has to handle.
2514 * Upon this information the size of the data structures is
2515 * determined that needs to be allocated.
2517 * 3 pass) Initialize the data structures just allocated with the
2518 * information in the ACPI table about available AMD IOMMUs
2519 * in the system. It also maps the PCI devices in the
2520 * system to specific IOMMUs
2522 * 4 pass) After the basic data structures are allocated and
2523 * initialized we update them with information about memory
2524 * remapping requirements parsed out of the ACPI table in
2527 * After everything is set up the IOMMUs are enabled and the necessary
2528 * hotplug and suspend notifiers are registered.
2530 static int __init early_amd_iommu_init(void)
2532 struct acpi_table_header *ivrs_base;
2534 int i, remap_cache_sz, ret = 0;
2537 if (!amd_iommu_detected)
2540 status = acpi_get_table("IVRS", 0, &ivrs_base);
2541 if (status == AE_NOT_FOUND)
2543 else if (ACPI_FAILURE(status)) {
2544 const char *err = acpi_format_exception(status);
2545 pr_err("IVRS table error: %s\n", err);
2550 * Validate checksum here so we don't need to do it when
2551 * we actually parse the table
2553 ret = check_ivrs_checksum(ivrs_base);
2557 amd_iommu_target_ivhd_type = get_highest_supported_ivhd_type(ivrs_base);
2558 DUMP_printk("Using IVHD type %#x\n", amd_iommu_target_ivhd_type);
2561 * First parse ACPI tables to find the largest Bus/Dev/Func
2562 * we need to handle. Upon this information the shared data
2563 * structures for the IOMMUs in the system will be allocated
2565 ret = find_last_devid_acpi(ivrs_base);
2569 dev_table_size = tbl_size(DEV_TABLE_ENTRY_SIZE);
2570 alias_table_size = tbl_size(ALIAS_TABLE_ENTRY_SIZE);
2571 rlookup_table_size = tbl_size(RLOOKUP_TABLE_ENTRY_SIZE);
2573 /* Device table - directly used by all IOMMUs */
2575 amd_iommu_dev_table = (void *)__get_free_pages(
2576 GFP_KERNEL | __GFP_ZERO | GFP_DMA32,
2577 get_order(dev_table_size));
2578 if (amd_iommu_dev_table == NULL)
2582 * Alias table - map PCI Bus/Dev/Func to Bus/Dev/Func the
2583 * IOMMU see for that device
2585 amd_iommu_alias_table = (void *)__get_free_pages(GFP_KERNEL,
2586 get_order(alias_table_size));
2587 if (amd_iommu_alias_table == NULL)
2590 /* IOMMU rlookup table - find the IOMMU for a specific device */
2591 amd_iommu_rlookup_table = (void *)__get_free_pages(
2592 GFP_KERNEL | __GFP_ZERO,
2593 get_order(rlookup_table_size));
2594 if (amd_iommu_rlookup_table == NULL)
2597 amd_iommu_pd_alloc_bitmap = (void *)__get_free_pages(
2598 GFP_KERNEL | __GFP_ZERO,
2599 get_order(MAX_DOMAIN_ID/8));
2600 if (amd_iommu_pd_alloc_bitmap == NULL)
2604 * let all alias entries point to itself
2606 for (i = 0; i <= amd_iommu_last_bdf; ++i)
2607 amd_iommu_alias_table[i] = i;
2610 * never allocate domain 0 because its used as the non-allocated and
2611 * error value placeholder
2613 __set_bit(0, amd_iommu_pd_alloc_bitmap);
2616 * now the data structures are allocated and basically initialized
2617 * start the real acpi table scan
2619 ret = init_iommu_all(ivrs_base);
2623 /* Disable IOMMU if there's Stoney Ridge graphics */
2624 for (i = 0; i < 32; i++) {
2625 pci_id = read_pci_config(0, i, 0, 0);
2626 if ((pci_id & 0xffff) == 0x1002 && (pci_id >> 16) == 0x98e4) {
2627 pr_info("Disable IOMMU on Stoney Ridge\n");
2628 amd_iommu_disabled = true;
2633 /* Disable any previously enabled IOMMUs */
2634 if (!is_kdump_kernel() || amd_iommu_disabled)
2637 if (amd_iommu_irq_remap)
2638 amd_iommu_irq_remap = check_ioapic_information();
2640 if (amd_iommu_irq_remap) {
2642 * Interrupt remapping enabled, create kmem_cache for the
2646 if (!AMD_IOMMU_GUEST_IR_GA(amd_iommu_guest_ir))
2647 remap_cache_sz = MAX_IRQS_PER_TABLE * sizeof(u32);
2649 remap_cache_sz = MAX_IRQS_PER_TABLE * (sizeof(u64) * 2);
2650 amd_iommu_irq_cache = kmem_cache_create("irq_remap_cache",
2652 IRQ_TABLE_ALIGNMENT,
2654 if (!amd_iommu_irq_cache)
2657 irq_lookup_table = (void *)__get_free_pages(
2658 GFP_KERNEL | __GFP_ZERO,
2659 get_order(rlookup_table_size));
2660 kmemleak_alloc(irq_lookup_table, rlookup_table_size,
2662 if (!irq_lookup_table)
2666 ret = init_memory_definitions(ivrs_base);
2670 /* init the device table */
2671 init_device_table();
2674 /* Don't leak any ACPI memory */
2675 acpi_put_table(ivrs_base);
2681 static int amd_iommu_enable_interrupts(void)
2683 struct amd_iommu *iommu;
2686 for_each_iommu(iommu) {
2687 ret = iommu_init_msi(iommu);
2696 static bool detect_ivrs(void)
2698 struct acpi_table_header *ivrs_base;
2701 status = acpi_get_table("IVRS", 0, &ivrs_base);
2702 if (status == AE_NOT_FOUND)
2704 else if (ACPI_FAILURE(status)) {
2705 const char *err = acpi_format_exception(status);
2706 pr_err("IVRS table error: %s\n", err);
2710 acpi_put_table(ivrs_base);
2712 /* Make sure ACS will be enabled during PCI probe */
2718 /****************************************************************************
2720 * AMD IOMMU Initialization State Machine
2722 ****************************************************************************/
2724 static int __init state_next(void)
2728 switch (init_state) {
2729 case IOMMU_START_STATE:
2730 if (!detect_ivrs()) {
2731 init_state = IOMMU_NOT_FOUND;
2734 init_state = IOMMU_IVRS_DETECTED;
2737 case IOMMU_IVRS_DETECTED:
2738 ret = early_amd_iommu_init();
2739 init_state = ret ? IOMMU_INIT_ERROR : IOMMU_ACPI_FINISHED;
2740 if (init_state == IOMMU_ACPI_FINISHED && amd_iommu_disabled) {
2741 pr_info("AMD IOMMU disabled\n");
2742 init_state = IOMMU_CMDLINE_DISABLED;
2746 case IOMMU_ACPI_FINISHED:
2747 early_enable_iommus();
2748 x86_platform.iommu_shutdown = disable_iommus;
2749 init_state = IOMMU_ENABLED;
2752 register_syscore_ops(&amd_iommu_syscore_ops);
2753 ret = amd_iommu_init_pci();
2754 init_state = ret ? IOMMU_INIT_ERROR : IOMMU_PCI_INIT;
2757 case IOMMU_PCI_INIT:
2758 ret = amd_iommu_enable_interrupts();
2759 init_state = ret ? IOMMU_INIT_ERROR : IOMMU_INTERRUPTS_EN;
2761 case IOMMU_INTERRUPTS_EN:
2762 ret = amd_iommu_init_dma_ops();
2763 init_state = ret ? IOMMU_INIT_ERROR : IOMMU_DMA_OPS;
2766 init_state = IOMMU_INITIALIZED;
2768 case IOMMU_INITIALIZED:
2771 case IOMMU_NOT_FOUND:
2772 case IOMMU_INIT_ERROR:
2773 case IOMMU_CMDLINE_DISABLED:
2774 /* Error states => do nothing */
2783 free_dma_resources();
2784 if (!irq_remapping_enabled) {
2786 free_iommu_resources();
2788 struct amd_iommu *iommu;
2790 uninit_device_table_dma();
2791 for_each_iommu(iommu)
2792 iommu_flush_all_caches(iommu);
2798 static int __init iommu_go_to_state(enum iommu_init_state state)
2802 while (init_state != state) {
2803 if (init_state == IOMMU_NOT_FOUND ||
2804 init_state == IOMMU_INIT_ERROR ||
2805 init_state == IOMMU_CMDLINE_DISABLED)
2813 #ifdef CONFIG_IRQ_REMAP
2814 int __init amd_iommu_prepare(void)
2818 amd_iommu_irq_remap = true;
2820 ret = iommu_go_to_state(IOMMU_ACPI_FINISHED);
2823 return amd_iommu_irq_remap ? 0 : -ENODEV;
2826 int __init amd_iommu_enable(void)
2830 ret = iommu_go_to_state(IOMMU_ENABLED);
2834 irq_remapping_enabled = 1;
2835 return amd_iommu_xt_mode;
2838 void amd_iommu_disable(void)
2840 amd_iommu_suspend();
2843 int amd_iommu_reenable(int mode)
2850 int __init amd_iommu_enable_faulting(void)
2852 /* We enable MSI later when PCI is initialized */
2858 * This is the core init function for AMD IOMMU hardware in the system.
2859 * This function is called from the generic x86 DMA layer initialization
2862 static int __init amd_iommu_init(void)
2864 struct amd_iommu *iommu;
2867 ret = iommu_go_to_state(IOMMU_INITIALIZED);
2868 #ifdef CONFIG_GART_IOMMU
2869 if (ret && list_empty(&amd_iommu_list)) {
2871 * We failed to initialize the AMD IOMMU - try fallback
2872 * to GART if possible.
2878 for_each_iommu(iommu)
2879 amd_iommu_debugfs_setup(iommu);
2884 static bool amd_iommu_sme_check(void)
2886 if (!sme_active() || (boot_cpu_data.x86 != 0x17))
2889 /* For Fam17h, a specific level of support is required */
2890 if (boot_cpu_data.microcode >= 0x08001205)
2893 if ((boot_cpu_data.microcode >= 0x08001126) &&
2894 (boot_cpu_data.microcode <= 0x080011ff))
2897 pr_notice("IOMMU not currently supported when SME is active\n");
2902 /****************************************************************************
2904 * Early detect code. This code runs at IOMMU detection time in the DMA
2905 * layer. It just looks if there is an IVRS ACPI table to detect AMD
2908 ****************************************************************************/
2909 int __init amd_iommu_detect(void)
2913 if (no_iommu || (iommu_detected && !gart_iommu_aperture))
2916 if (!amd_iommu_sme_check())
2919 ret = iommu_go_to_state(IOMMU_IVRS_DETECTED);
2923 amd_iommu_detected = true;
2925 x86_init.iommu.iommu_init = amd_iommu_init;
2930 /****************************************************************************
2932 * Parsing functions for the AMD IOMMU specific kernel command line
2935 ****************************************************************************/
2937 static int __init parse_amd_iommu_dump(char *str)
2939 amd_iommu_dump = true;
2944 static int __init parse_amd_iommu_intr(char *str)
2946 for (; *str; ++str) {
2947 if (strncmp(str, "legacy", 6) == 0) {
2948 amd_iommu_guest_ir = AMD_IOMMU_GUEST_IR_LEGACY_GA;
2951 if (strncmp(str, "vapic", 5) == 0) {
2952 amd_iommu_guest_ir = AMD_IOMMU_GUEST_IR_VAPIC;
2959 static int __init parse_amd_iommu_options(char *str)
2961 for (; *str; ++str) {
2962 if (strncmp(str, "fullflush", 9) == 0)
2963 amd_iommu_unmap_flush = true;
2964 if (strncmp(str, "off", 3) == 0)
2965 amd_iommu_disabled = true;
2966 if (strncmp(str, "force_isolation", 15) == 0)
2967 amd_iommu_force_isolation = true;
2973 static int __init parse_ivrs_ioapic(char *str)
2975 unsigned int bus, dev, fn;
2979 ret = sscanf(str, "[%d]=%x:%x.%x", &id, &bus, &dev, &fn);
2982 pr_err("Invalid command line: ivrs_ioapic%s\n", str);
2986 if (early_ioapic_map_size == EARLY_MAP_SIZE) {
2987 pr_err("Early IOAPIC map overflow - ignoring ivrs_ioapic%s\n",
2992 devid = ((bus & 0xff) << 8) | ((dev & 0x1f) << 3) | (fn & 0x7);
2994 cmdline_maps = true;
2995 i = early_ioapic_map_size++;
2996 early_ioapic_map[i].id = id;
2997 early_ioapic_map[i].devid = devid;
2998 early_ioapic_map[i].cmd_line = true;
3003 static int __init parse_ivrs_hpet(char *str)
3005 unsigned int bus, dev, fn;
3009 ret = sscanf(str, "[%d]=%x:%x.%x", &id, &bus, &dev, &fn);
3012 pr_err("Invalid command line: ivrs_hpet%s\n", str);
3016 if (early_hpet_map_size == EARLY_MAP_SIZE) {
3017 pr_err("Early HPET map overflow - ignoring ivrs_hpet%s\n",
3022 devid = ((bus & 0xff) << 8) | ((dev & 0x1f) << 3) | (fn & 0x7);
3024 cmdline_maps = true;
3025 i = early_hpet_map_size++;
3026 early_hpet_map[i].id = id;
3027 early_hpet_map[i].devid = devid;
3028 early_hpet_map[i].cmd_line = true;
3033 static int __init parse_ivrs_acpihid(char *str)
3036 char *hid, *uid, *p;
3037 char acpiid[ACPIHID_UID_LEN + ACPIHID_HID_LEN] = {0};
3040 ret = sscanf(str, "[%x:%x.%x]=%s", &bus, &dev, &fn, acpiid);
3042 pr_err("Invalid command line: ivrs_acpihid(%s)\n", str);
3047 hid = strsep(&p, ":");
3050 if (!hid || !(*hid) || !uid) {
3051 pr_err("Invalid command line: hid or uid\n");
3055 i = early_acpihid_map_size++;
3056 memcpy(early_acpihid_map[i].hid, hid, strlen(hid));
3057 memcpy(early_acpihid_map[i].uid, uid, strlen(uid));
3058 early_acpihid_map[i].devid =
3059 ((bus & 0xff) << 8) | ((dev & 0x1f) << 3) | (fn & 0x7);
3060 early_acpihid_map[i].cmd_line = true;
3065 __setup("amd_iommu_dump", parse_amd_iommu_dump);
3066 __setup("amd_iommu=", parse_amd_iommu_options);
3067 __setup("amd_iommu_intr=", parse_amd_iommu_intr);
3068 __setup("ivrs_ioapic", parse_ivrs_ioapic);
3069 __setup("ivrs_hpet", parse_ivrs_hpet);
3070 __setup("ivrs_acpihid", parse_ivrs_acpihid);
3072 IOMMU_INIT_FINISH(amd_iommu_detect,
3073 gart_iommu_hole_init,
3077 bool amd_iommu_v2_supported(void)
3079 return amd_iommu_v2_present;
3081 EXPORT_SYMBOL(amd_iommu_v2_supported);
3083 struct amd_iommu *get_amd_iommu(unsigned int idx)
3086 struct amd_iommu *iommu;
3088 for_each_iommu(iommu)
3093 EXPORT_SYMBOL(get_amd_iommu);
3095 /****************************************************************************
3097 * IOMMU EFR Performance Counter support functionality. This code allows
3098 * access to the IOMMU PC functionality.
3100 ****************************************************************************/
3102 u8 amd_iommu_pc_get_max_banks(unsigned int idx)
3104 struct amd_iommu *iommu = get_amd_iommu(idx);
3107 return iommu->max_banks;
3111 EXPORT_SYMBOL(amd_iommu_pc_get_max_banks);
3113 bool amd_iommu_pc_supported(void)
3115 return amd_iommu_pc_present;
3117 EXPORT_SYMBOL(amd_iommu_pc_supported);
3119 u8 amd_iommu_pc_get_max_counters(unsigned int idx)
3121 struct amd_iommu *iommu = get_amd_iommu(idx);
3124 return iommu->max_counters;
3128 EXPORT_SYMBOL(amd_iommu_pc_get_max_counters);
3130 static int iommu_pc_get_set_reg(struct amd_iommu *iommu, u8 bank, u8 cntr,
3131 u8 fxn, u64 *value, bool is_write)
3136 /* Make sure the IOMMU PC resource is available */
3137 if (!amd_iommu_pc_present)
3140 /* Check for valid iommu and pc register indexing */
3141 if (WARN_ON(!iommu || (fxn > 0x28) || (fxn & 7)))
3144 offset = (u32)(((0x40 | bank) << 12) | (cntr << 8) | fxn);
3146 /* Limit the offset to the hw defined mmio region aperture */
3147 max_offset_lim = (u32)(((0x40 | iommu->max_banks) << 12) |
3148 (iommu->max_counters << 8) | 0x28);
3149 if ((offset < MMIO_CNTR_REG_OFFSET) ||
3150 (offset > max_offset_lim))
3154 u64 val = *value & GENMASK_ULL(47, 0);
3156 writel((u32)val, iommu->mmio_base + offset);
3157 writel((val >> 32), iommu->mmio_base + offset + 4);
3159 *value = readl(iommu->mmio_base + offset + 4);
3161 *value |= readl(iommu->mmio_base + offset);
3162 *value &= GENMASK_ULL(47, 0);
3168 int amd_iommu_pc_get_reg(struct amd_iommu *iommu, u8 bank, u8 cntr, u8 fxn, u64 *value)
3173 return iommu_pc_get_set_reg(iommu, bank, cntr, fxn, value, false);
3175 EXPORT_SYMBOL(amd_iommu_pc_get_reg);
3177 int amd_iommu_pc_set_reg(struct amd_iommu *iommu, u8 bank, u8 cntr, u8 fxn, u64 *value)
3182 return iommu_pc_get_set_reg(iommu, bank, cntr, fxn, value, true);
3184 EXPORT_SYMBOL(amd_iommu_pc_set_reg);