--- /dev/null
+What: /sys/kernel/debug/vfio
+Date: December 2023
+KernelVersion: 6.8
+Contact: Longfang Liu <liulongfang@huawei.com>
+Description: This debugfs file directory is used for debugging
+ of vfio devices, it's a common directory for all vfio devices.
+ Vfio core will create a device subdirectory under this
+ directory.
+
+What: /sys/kernel/debug/vfio/<device>/migration
+Date: December 2023
+KernelVersion: 6.8
+Contact: Longfang Liu <liulongfang@huawei.com>
+Description: This debugfs file directory is used for debugging
+ of vfio devices that support live migration.
+ The debugfs of each vfio device that supports live migration
+ could be created under this directory.
+
+What: /sys/kernel/debug/vfio/<device>/migration/state
+Date: December 2023
+KernelVersion: 6.8
+Contact: Longfang Liu <liulongfang@huawei.com>
+Description: Read the live migration status of the vfio device.
+ The contents of the state file reflects the migration state
+ relative to those defined in the vfio_device_mig_state enum
L: kvm@vger.kernel.org
S: Maintained
T: git https://github.com/awilliam/linux-vfio.git
+F: Documentation/ABI/testing/debugfs-vfio
F: Documentation/ABI/testing/sysfs-devices-vfio-dev
F: Documentation/driver-api/vfio.rst
F: drivers/vfio/
S: Maintained
F: drivers/vfio/pci/mlx5/
+VFIO VIRTIO PCI DRIVER
+M: Yishai Hadas <yishaih@nvidia.com>
+L: kvm@vger.kernel.org
+L: virtualization@lists.linux-foundation.org
+S: Maintained
+F: drivers/vfio/pci/virtio
+
VFIO PCI DEVICE SPECIFIC DRIVERS
R: Jason Gunthorpe <jgg@nvidia.com>
R: Yishai Hadas <yishaih@nvidia.com>
select EVENTFD
default n
+config VFIO_DEBUGFS
+ bool "Export VFIO internals in DebugFS"
+ depends on DEBUG_FS
+ help
+ Allows exposure of VFIO device internals. This option enables
+ the use of debugfs by VFIO drivers as required. The device can
+ cause the VFIO code create a top-level debug/vfio directory
+ during initialization, and then populate a subdirectory with
+ entries as required.
+
source "drivers/vfio/pci/Kconfig"
source "drivers/vfio/platform/Kconfig"
source "drivers/vfio/mdev/Kconfig"
vfio-$(CONFIG_IOMMUFD) += iommufd.o
vfio-$(CONFIG_VFIO_CONTAINER) += container.o
vfio-$(CONFIG_VFIO_VIRQFD) += virqfd.o
+vfio-$(CONFIG_VFIO_DEBUGFS) += debugfs.o
obj-$(CONFIG_VFIO_IOMMU_TYPE1) += vfio_iommu_type1.o
obj-$(CONFIG_VFIO_IOMMU_SPAPR_TCE) += vfio_iommu_spapr_tce.o
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2023, HiSilicon Ltd.
+ */
+
+#include <linux/device.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+#include <linux/vfio.h>
+#include "vfio.h"
+
+static struct dentry *vfio_debugfs_root;
+
+static int vfio_device_state_read(struct seq_file *seq, void *data)
+{
+ struct device *vf_dev = seq->private;
+ struct vfio_device *vdev = container_of(vf_dev,
+ struct vfio_device, device);
+ enum vfio_device_mig_state state;
+ int ret;
+
+ BUILD_BUG_ON(VFIO_DEVICE_STATE_NR !=
+ VFIO_DEVICE_STATE_PRE_COPY_P2P + 1);
+
+ ret = vdev->mig_ops->migration_get_state(vdev, &state);
+ if (ret)
+ return -EINVAL;
+
+ switch (state) {
+ case VFIO_DEVICE_STATE_ERROR:
+ seq_puts(seq, "ERROR\n");
+ break;
+ case VFIO_DEVICE_STATE_STOP:
+ seq_puts(seq, "STOP\n");
+ break;
+ case VFIO_DEVICE_STATE_RUNNING:
+ seq_puts(seq, "RUNNING\n");
+ break;
+ case VFIO_DEVICE_STATE_STOP_COPY:
+ seq_puts(seq, "STOP_COPY\n");
+ break;
+ case VFIO_DEVICE_STATE_RESUMING:
+ seq_puts(seq, "RESUMING\n");
+ break;
+ case VFIO_DEVICE_STATE_RUNNING_P2P:
+ seq_puts(seq, "RUNNING_P2P\n");
+ break;
+ case VFIO_DEVICE_STATE_PRE_COPY:
+ seq_puts(seq, "PRE_COPY\n");
+ break;
+ case VFIO_DEVICE_STATE_PRE_COPY_P2P:
+ seq_puts(seq, "PRE_COPY_P2P\n");
+ break;
+ default:
+ seq_puts(seq, "Invalid\n");
+ }
+
+ return 0;
+}
+
+void vfio_device_debugfs_init(struct vfio_device *vdev)
+{
+ struct device *dev = &vdev->device;
+
+ vdev->debug_root = debugfs_create_dir(dev_name(vdev->dev),
+ vfio_debugfs_root);
+
+ if (vdev->mig_ops) {
+ struct dentry *vfio_dev_migration = NULL;
+
+ vfio_dev_migration = debugfs_create_dir("migration",
+ vdev->debug_root);
+ debugfs_create_devm_seqfile(dev, "state", vfio_dev_migration,
+ vfio_device_state_read);
+ }
+}
+
+void vfio_device_debugfs_exit(struct vfio_device *vdev)
+{
+ debugfs_remove_recursive(vdev->debug_root);
+}
+
+void vfio_debugfs_create_root(void)
+{
+ vfio_debugfs_root = debugfs_create_dir("vfio", NULL);
+}
+
+void vfio_debugfs_remove_root(void)
+{
+ debugfs_remove_recursive(vfio_debugfs_root);
+ vfio_debugfs_root = NULL;
+}
source "drivers/vfio/pci/pds/Kconfig"
+source "drivers/vfio/pci/virtio/Kconfig"
+
endmenu
obj-$(CONFIG_HISI_ACC_VFIO_PCI) += hisilicon/
obj-$(CONFIG_PDS_VFIO_PCI) += pds/
+
+obj-$(CONFIG_VIRTIO_VFIO_PCI) += virtio/
size_t len, loff_t *pos)
{
struct hisi_acc_vf_migration_file *migf = filp->private_data;
+ u8 *vf_data = (u8 *)&migf->vf_data;
loff_t requested_length;
ssize_t done = 0;
int ret;
goto out_unlock;
}
- ret = copy_from_user(&migf->vf_data, buf, len);
+ ret = copy_from_user(vf_data + *pos, buf, len);
if (ret) {
done = -EFAULT;
goto out_unlock;
len = min_t(size_t, migf->total_length - *pos, len);
if (len) {
- ret = copy_to_user(buf, &migf->vf_data, len);
+ u8 *vf_data = (u8 *)&migf->vf_data;
+
+ ret = copy_to_user(buf, vf_data + *pos, len);
if (ret) {
done = -EFAULT;
goto out_unlock;
kfree(region_info);
}
-static int pds_vfio_dirty_alloc_bitmaps(struct pds_vfio_dirty *dirty,
+static int pds_vfio_dirty_alloc_bitmaps(struct pds_vfio_region *region,
unsigned long bytes)
{
unsigned long *host_seq_bmp, *host_ack_bmp;
return -ENOMEM;
}
- dirty->host_seq.bmp = host_seq_bmp;
- dirty->host_ack.bmp = host_ack_bmp;
+ region->host_seq = host_seq_bmp;
+ region->host_ack = host_ack_bmp;
+ region->bmp_bytes = bytes;
return 0;
}
static void pds_vfio_dirty_free_bitmaps(struct pds_vfio_dirty *dirty)
{
- vfree(dirty->host_seq.bmp);
- vfree(dirty->host_ack.bmp);
- dirty->host_seq.bmp = NULL;
- dirty->host_ack.bmp = NULL;
+ if (!dirty->regions)
+ return;
+
+ for (int i = 0; i < dirty->num_regions; i++) {
+ struct pds_vfio_region *region = &dirty->regions[i];
+
+ vfree(region->host_seq);
+ vfree(region->host_ack);
+ region->host_seq = NULL;
+ region->host_ack = NULL;
+ region->bmp_bytes = 0;
+ }
}
static void __pds_vfio_dirty_free_sgl(struct pds_vfio_pci_device *pds_vfio,
- struct pds_vfio_bmp_info *bmp_info)
+ struct pds_vfio_region *region)
{
struct pci_dev *pdev = pds_vfio->vfio_coredev.pdev;
struct device *pdsc_dev = &pci_physfn(pdev)->dev;
- dma_unmap_single(pdsc_dev, bmp_info->sgl_addr,
- bmp_info->num_sge * sizeof(struct pds_lm_sg_elem),
+ dma_unmap_single(pdsc_dev, region->sgl_addr,
+ region->num_sge * sizeof(struct pds_lm_sg_elem),
DMA_BIDIRECTIONAL);
- kfree(bmp_info->sgl);
+ kfree(region->sgl);
- bmp_info->num_sge = 0;
- bmp_info->sgl = NULL;
- bmp_info->sgl_addr = 0;
+ region->num_sge = 0;
+ region->sgl = NULL;
+ region->sgl_addr = 0;
}
static void pds_vfio_dirty_free_sgl(struct pds_vfio_pci_device *pds_vfio)
{
- if (pds_vfio->dirty.host_seq.sgl)
- __pds_vfio_dirty_free_sgl(pds_vfio, &pds_vfio->dirty.host_seq);
- if (pds_vfio->dirty.host_ack.sgl)
- __pds_vfio_dirty_free_sgl(pds_vfio, &pds_vfio->dirty.host_ack);
+ struct pds_vfio_dirty *dirty = &pds_vfio->dirty;
+
+ if (!dirty->regions)
+ return;
+
+ for (int i = 0; i < dirty->num_regions; i++) {
+ struct pds_vfio_region *region = &dirty->regions[i];
+
+ if (region->sgl)
+ __pds_vfio_dirty_free_sgl(pds_vfio, region);
+ }
}
-static int __pds_vfio_dirty_alloc_sgl(struct pds_vfio_pci_device *pds_vfio,
- struct pds_vfio_bmp_info *bmp_info,
- u32 page_count)
+static int pds_vfio_dirty_alloc_sgl(struct pds_vfio_pci_device *pds_vfio,
+ struct pds_vfio_region *region,
+ u32 page_count)
{
struct pci_dev *pdev = pds_vfio->vfio_coredev.pdev;
struct device *pdsc_dev = &pci_physfn(pdev)->dev;
return -EIO;
}
- bmp_info->sgl = sgl;
- bmp_info->num_sge = max_sge;
- bmp_info->sgl_addr = sgl_addr;
+ region->sgl = sgl;
+ region->num_sge = max_sge;
+ region->sgl_addr = sgl_addr;
return 0;
}
-static int pds_vfio_dirty_alloc_sgl(struct pds_vfio_pci_device *pds_vfio,
- u32 page_count)
+static void pds_vfio_dirty_free_regions(struct pds_vfio_dirty *dirty)
{
+ vfree(dirty->regions);
+ dirty->regions = NULL;
+ dirty->num_regions = 0;
+}
+
+static int pds_vfio_dirty_alloc_regions(struct pds_vfio_pci_device *pds_vfio,
+ struct pds_lm_dirty_region_info *region_info,
+ u64 region_page_size, u8 num_regions)
+{
+ struct pci_dev *pdev = pds_vfio->vfio_coredev.pdev;
struct pds_vfio_dirty *dirty = &pds_vfio->dirty;
+ u32 dev_bmp_offset_byte = 0;
int err;
- err = __pds_vfio_dirty_alloc_sgl(pds_vfio, &dirty->host_seq,
- page_count);
- if (err)
- return err;
+ dirty->regions = vcalloc(num_regions, sizeof(struct pds_vfio_region));
+ if (!dirty->regions)
+ return -ENOMEM;
+ dirty->num_regions = num_regions;
+
+ for (int i = 0; i < num_regions; i++) {
+ struct pds_lm_dirty_region_info *ri = ®ion_info[i];
+ struct pds_vfio_region *region = &dirty->regions[i];
+ u64 region_size, region_start;
+ u32 page_count;
+
+ /* page_count might be adjusted by the device */
+ page_count = le32_to_cpu(ri->page_count);
+ region_start = le64_to_cpu(ri->dma_base);
+ region_size = page_count * region_page_size;
+
+ err = pds_vfio_dirty_alloc_bitmaps(region,
+ page_count / BITS_PER_BYTE);
+ if (err) {
+ dev_err(&pdev->dev, "Failed to alloc dirty bitmaps: %pe\n",
+ ERR_PTR(err));
+ goto out_free_regions;
+ }
- err = __pds_vfio_dirty_alloc_sgl(pds_vfio, &dirty->host_ack,
- page_count);
- if (err) {
- __pds_vfio_dirty_free_sgl(pds_vfio, &dirty->host_seq);
- return err;
+ err = pds_vfio_dirty_alloc_sgl(pds_vfio, region, page_count);
+ if (err) {
+ dev_err(&pdev->dev, "Failed to alloc dirty sg lists: %pe\n",
+ ERR_PTR(err));
+ goto out_free_regions;
+ }
+
+ region->size = region_size;
+ region->start = region_start;
+ region->page_size = region_page_size;
+ region->dev_bmp_offset_start_byte = dev_bmp_offset_byte;
+
+ dev_bmp_offset_byte += page_count / BITS_PER_BYTE;
+ if (dev_bmp_offset_byte % BITS_PER_BYTE) {
+ dev_err(&pdev->dev, "Device bitmap offset is mis-aligned\n");
+ err = -EINVAL;
+ goto out_free_regions;
+ }
}
return 0;
+
+out_free_regions:
+ pds_vfio_dirty_free_bitmaps(dirty);
+ pds_vfio_dirty_free_sgl(pds_vfio);
+ pds_vfio_dirty_free_regions(dirty);
+
+ return err;
}
static int pds_vfio_dirty_enable(struct pds_vfio_pci_device *pds_vfio,
{
struct pci_dev *pdev = pds_vfio->vfio_coredev.pdev;
struct device *pdsc_dev = &pci_physfn(pdev)->dev;
- struct pds_vfio_dirty *dirty = &pds_vfio->dirty;
- u64 region_start, region_size, region_page_size;
struct pds_lm_dirty_region_info *region_info;
struct interval_tree_node *node = NULL;
+ u64 region_page_size = *page_size;
u8 max_regions = 0, num_regions;
dma_addr_t regions_dma = 0;
u32 num_ranges = nnodes;
- u32 page_count;
- u16 len;
int err;
+ u16 len;
dev_dbg(&pdev->dev, "vf%u: Start dirty page tracking\n",
pds_vfio->vf_id);
return -EOPNOTSUPP;
}
- /*
- * Only support 1 region for now. If there are any large gaps in the
- * VM's address regions, then this would be a waste of memory as we are
- * generating 2 bitmaps (ack/seq) from the min address to the max
- * address of the VM's address regions. In the future, if we support
- * more than one region in the device/driver we can split the bitmaps
- * on the largest address region gaps. We can do this split up to the
- * max_regions times returned from the dirty_status command.
- */
- max_regions = 1;
if (num_ranges > max_regions) {
vfio_combine_iova_ranges(ranges, nnodes, max_regions);
num_ranges = max_regions;
}
+ region_info = kcalloc(num_ranges, sizeof(*region_info), GFP_KERNEL);
+ if (!region_info)
+ return -ENOMEM;
+ len = num_ranges * sizeof(*region_info);
+
node = interval_tree_iter_first(ranges, 0, ULONG_MAX);
if (!node)
return -EINVAL;
+ for (int i = 0; i < num_ranges; i++) {
+ struct pds_lm_dirty_region_info *ri = ®ion_info[i];
+ u64 region_size = node->last - node->start + 1;
+ u64 region_start = node->start;
+ u32 page_count;
- region_size = node->last - node->start + 1;
- region_start = node->start;
- region_page_size = *page_size;
+ page_count = DIV_ROUND_UP(region_size, region_page_size);
- len = sizeof(*region_info);
- region_info = kzalloc(len, GFP_KERNEL);
- if (!region_info)
- return -ENOMEM;
+ ri->dma_base = cpu_to_le64(region_start);
+ ri->page_count = cpu_to_le32(page_count);
+ ri->page_size_log2 = ilog2(region_page_size);
- page_count = DIV_ROUND_UP(region_size, region_page_size);
+ dev_dbg(&pdev->dev,
+ "region_info[%d]: region_start 0x%llx region_end 0x%lx region_size 0x%llx page_count %u page_size %llu\n",
+ i, region_start, node->last, region_size, page_count,
+ region_page_size);
- region_info->dma_base = cpu_to_le64(region_start);
- region_info->page_count = cpu_to_le32(page_count);
- region_info->page_size_log2 = ilog2(region_page_size);
+ node = interval_tree_iter_next(node, 0, ULONG_MAX);
+ }
regions_dma = dma_map_single(pdsc_dev, (void *)region_info, len,
DMA_BIDIRECTIONAL);
goto out_free_region_info;
}
- err = pds_vfio_dirty_enable_cmd(pds_vfio, regions_dma, max_regions);
+ err = pds_vfio_dirty_enable_cmd(pds_vfio, regions_dma, num_ranges);
dma_unmap_single(pdsc_dev, regions_dma, len, DMA_BIDIRECTIONAL);
if (err)
goto out_free_region_info;
- /*
- * page_count might be adjusted by the device,
- * update it before freeing region_info DMA
- */
- page_count = le32_to_cpu(region_info->page_count);
-
- dev_dbg(&pdev->dev,
- "region_info: regions_dma 0x%llx dma_base 0x%llx page_count %u page_size_log2 %u\n",
- regions_dma, region_start, page_count,
- (u8)ilog2(region_page_size));
-
- err = pds_vfio_dirty_alloc_bitmaps(dirty, page_count / BITS_PER_BYTE);
- if (err) {
- dev_err(&pdev->dev, "Failed to alloc dirty bitmaps: %pe\n",
- ERR_PTR(err));
- goto out_free_region_info;
- }
-
- err = pds_vfio_dirty_alloc_sgl(pds_vfio, page_count);
+ err = pds_vfio_dirty_alloc_regions(pds_vfio, region_info,
+ region_page_size, num_ranges);
if (err) {
- dev_err(&pdev->dev, "Failed to alloc dirty sg lists: %pe\n",
- ERR_PTR(err));
- goto out_free_bitmaps;
+ dev_err(&pdev->dev,
+ "Failed to allocate %d regions for tracking dirty regions: %pe\n",
+ num_regions, ERR_PTR(err));
+ goto out_dirty_disable;
}
- dirty->region_start = region_start;
- dirty->region_size = region_size;
- dirty->region_page_size = region_page_size;
pds_vfio_dirty_set_enabled(pds_vfio);
pds_vfio_print_guest_region_info(pds_vfio, max_regions);
return 0;
-out_free_bitmaps:
- pds_vfio_dirty_free_bitmaps(dirty);
+out_dirty_disable:
+ pds_vfio_dirty_disable_cmd(pds_vfio);
out_free_region_info:
kfree(region_info);
return err;
pds_vfio_dirty_disable_cmd(pds_vfio);
pds_vfio_dirty_free_sgl(pds_vfio);
pds_vfio_dirty_free_bitmaps(&pds_vfio->dirty);
+ pds_vfio_dirty_free_regions(&pds_vfio->dirty);
}
if (send_cmd)
}
static int pds_vfio_dirty_seq_ack(struct pds_vfio_pci_device *pds_vfio,
- struct pds_vfio_bmp_info *bmp_info,
- u32 offset, u32 bmp_bytes, bool read_seq)
+ struct pds_vfio_region *region,
+ unsigned long *seq_ack_bmp, u32 offset,
+ u32 bmp_bytes, bool read_seq)
{
const char *bmp_type_str = read_seq ? "read_seq" : "write_ack";
u8 dma_dir = read_seq ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
int err;
int i;
- bmp = (void *)((u64)bmp_info->bmp + offset);
+ bmp = (void *)((u64)seq_ack_bmp + offset);
page_offset = offset_in_page(bmp);
bmp -= page_offset;
goto out_free_sg_table;
for_each_sgtable_dma_sg(&sg_table, sg, i) {
- struct pds_lm_sg_elem *sg_elem = &bmp_info->sgl[i];
+ struct pds_lm_sg_elem *sg_elem = ®ion->sgl[i];
sg_elem->addr = cpu_to_le64(sg_dma_address(sg));
sg_elem->len = cpu_to_le32(sg_dma_len(sg));
num_sge = sg_table.nents;
size = num_sge * sizeof(struct pds_lm_sg_elem);
- dma_sync_single_for_device(pdsc_dev, bmp_info->sgl_addr, size, dma_dir);
- err = pds_vfio_dirty_seq_ack_cmd(pds_vfio, bmp_info->sgl_addr, num_sge,
+ offset += region->dev_bmp_offset_start_byte;
+ dma_sync_single_for_device(pdsc_dev, region->sgl_addr, size, dma_dir);
+ err = pds_vfio_dirty_seq_ack_cmd(pds_vfio, region->sgl_addr, num_sge,
offset, bmp_bytes, read_seq);
if (err)
dev_err(&pdev->dev,
"Dirty bitmap %s failed offset %u bmp_bytes %u num_sge %u DMA 0x%llx: %pe\n",
bmp_type_str, offset, bmp_bytes,
- num_sge, bmp_info->sgl_addr, ERR_PTR(err));
- dma_sync_single_for_cpu(pdsc_dev, bmp_info->sgl_addr, size, dma_dir);
+ num_sge, region->sgl_addr, ERR_PTR(err));
+ dma_sync_single_for_cpu(pdsc_dev, region->sgl_addr, size, dma_dir);
dma_unmap_sgtable(pdsc_dev, &sg_table, dma_dir, 0);
out_free_sg_table:
}
static int pds_vfio_dirty_write_ack(struct pds_vfio_pci_device *pds_vfio,
+ struct pds_vfio_region *region,
u32 offset, u32 len)
{
- return pds_vfio_dirty_seq_ack(pds_vfio, &pds_vfio->dirty.host_ack,
+
+ return pds_vfio_dirty_seq_ack(pds_vfio, region, region->host_ack,
offset, len, WRITE_ACK);
}
static int pds_vfio_dirty_read_seq(struct pds_vfio_pci_device *pds_vfio,
+ struct pds_vfio_region *region,
u32 offset, u32 len)
{
- return pds_vfio_dirty_seq_ack(pds_vfio, &pds_vfio->dirty.host_seq,
+ return pds_vfio_dirty_seq_ack(pds_vfio, region, region->host_seq,
offset, len, READ_SEQ);
}
static int pds_vfio_dirty_process_bitmaps(struct pds_vfio_pci_device *pds_vfio,
+ struct pds_vfio_region *region,
struct iova_bitmap *dirty_bitmap,
u32 bmp_offset, u32 len_bytes)
{
- u64 page_size = pds_vfio->dirty.region_page_size;
- u64 region_start = pds_vfio->dirty.region_start;
+ u64 page_size = region->page_size;
+ u64 region_start = region->start;
u32 bmp_offset_bit;
__le64 *seq, *ack;
int dword_count;
dword_count = len_bytes / sizeof(u64);
- seq = (__le64 *)((u64)pds_vfio->dirty.host_seq.bmp + bmp_offset);
- ack = (__le64 *)((u64)pds_vfio->dirty.host_ack.bmp + bmp_offset);
+ seq = (__le64 *)((u64)region->host_seq + bmp_offset);
+ ack = (__le64 *)((u64)region->host_ack + bmp_offset);
bmp_offset_bit = bmp_offset * 8;
for (int i = 0; i < dword_count; i++) {
return 0;
}
+static struct pds_vfio_region *
+pds_vfio_get_region(struct pds_vfio_pci_device *pds_vfio, unsigned long iova)
+{
+ struct pds_vfio_dirty *dirty = &pds_vfio->dirty;
+
+ for (int i = 0; i < dirty->num_regions; i++) {
+ struct pds_vfio_region *region = &dirty->regions[i];
+
+ if (iova >= region->start &&
+ iova < (region->start + region->size))
+ return region;
+ }
+
+ return NULL;
+}
+
static int pds_vfio_dirty_sync(struct pds_vfio_pci_device *pds_vfio,
struct iova_bitmap *dirty_bitmap,
unsigned long iova, unsigned long length)
{
struct device *dev = &pds_vfio->vfio_coredev.pdev->dev;
- struct pds_vfio_dirty *dirty = &pds_vfio->dirty;
+ struct pds_vfio_region *region;
u64 bmp_offset, bmp_bytes;
u64 bitmap_size, pages;
int err;
return -EINVAL;
}
- pages = DIV_ROUND_UP(length, pds_vfio->dirty.region_page_size);
+ region = pds_vfio_get_region(pds_vfio, iova);
+ if (!region) {
+ dev_err(dev, "vf%u: Failed to find region that contains iova 0x%lx length 0x%lx\n",
+ pds_vfio->vf_id, iova, length);
+ return -EINVAL;
+ }
+
+ pages = DIV_ROUND_UP(length, region->page_size);
bitmap_size =
round_up(pages, sizeof(u64) * BITS_PER_BYTE) / BITS_PER_BYTE;
dev_dbg(dev,
"vf%u: iova 0x%lx length %lu page_size %llu pages %llu bitmap_size %llu\n",
- pds_vfio->vf_id, iova, length, pds_vfio->dirty.region_page_size,
+ pds_vfio->vf_id, iova, length, region->page_size,
pages, bitmap_size);
- if (!length || ((dirty->region_start + iova + length) >
- (dirty->region_start + dirty->region_size))) {
+ if (!length || ((iova - region->start + length) > region->size)) {
dev_err(dev, "Invalid iova 0x%lx and/or length 0x%lx to sync\n",
iova, length);
return -EINVAL;
}
/* bitmap is modified in 64 bit chunks */
- bmp_bytes = ALIGN(DIV_ROUND_UP(length / dirty->region_page_size,
- sizeof(u64)),
- sizeof(u64));
+ bmp_bytes = ALIGN(DIV_ROUND_UP(length / region->page_size,
+ sizeof(u64)), sizeof(u64));
if (bmp_bytes != bitmap_size) {
dev_err(dev,
"Calculated bitmap bytes %llu not equal to bitmap size %llu\n",
return -EINVAL;
}
- bmp_offset = DIV_ROUND_UP(iova / dirty->region_page_size, sizeof(u64));
+ if (bmp_bytes > region->bmp_bytes) {
+ dev_err(dev,
+ "Calculated bitmap bytes %llu larger than region's cached bmp_bytes %llu\n",
+ bmp_bytes, region->bmp_bytes);
+ return -EINVAL;
+ }
+
+ bmp_offset = DIV_ROUND_UP((iova - region->start) /
+ region->page_size, sizeof(u64));
dev_dbg(dev,
"Syncing dirty bitmap, iova 0x%lx length 0x%lx, bmp_offset %llu bmp_bytes %llu\n",
iova, length, bmp_offset, bmp_bytes);
- err = pds_vfio_dirty_read_seq(pds_vfio, bmp_offset, bmp_bytes);
+ err = pds_vfio_dirty_read_seq(pds_vfio, region, bmp_offset, bmp_bytes);
if (err)
return err;
- err = pds_vfio_dirty_process_bitmaps(pds_vfio, dirty_bitmap, bmp_offset,
- bmp_bytes);
+ err = pds_vfio_dirty_process_bitmaps(pds_vfio, region, dirty_bitmap,
+ bmp_offset, bmp_bytes);
if (err)
return err;
- err = pds_vfio_dirty_write_ack(pds_vfio, bmp_offset, bmp_bytes);
+ err = pds_vfio_dirty_write_ack(pds_vfio, region, bmp_offset, bmp_bytes);
if (err)
return err;
#ifndef _DIRTY_H_
#define _DIRTY_H_
-struct pds_vfio_bmp_info {
- unsigned long *bmp;
- u32 bmp_bytes;
+struct pds_vfio_region {
+ unsigned long *host_seq;
+ unsigned long *host_ack;
+ u64 bmp_bytes;
+ u64 size;
+ u64 start;
+ u64 page_size;
struct pds_lm_sg_elem *sgl;
dma_addr_t sgl_addr;
+ u32 dev_bmp_offset_start_byte;
u16 num_sge;
};
struct pds_vfio_dirty {
- struct pds_vfio_bmp_info host_seq;
- struct pds_vfio_bmp_info host_ack;
- u64 region_size;
- u64 region_start;
- u64 region_page_size;
+ struct pds_vfio_region *regions;
+ u8 num_regions;
bool is_enabled;
};
#define vfio_iowrite8 iowrite8
#define VFIO_IOWRITE(size) \
-static int vfio_pci_iowrite##size(struct vfio_pci_core_device *vdev, \
+int vfio_pci_core_iowrite##size(struct vfio_pci_core_device *vdev, \
bool test_mem, u##size val, void __iomem *io) \
{ \
if (test_mem) { \
up_read(&vdev->memory_lock); \
\
return 0; \
-}
+} \
+EXPORT_SYMBOL_GPL(vfio_pci_core_iowrite##size);
VFIO_IOWRITE(8)
VFIO_IOWRITE(16)
#endif
#define VFIO_IOREAD(size) \
-static int vfio_pci_ioread##size(struct vfio_pci_core_device *vdev, \
+int vfio_pci_core_ioread##size(struct vfio_pci_core_device *vdev, \
bool test_mem, u##size *val, void __iomem *io) \
{ \
if (test_mem) { \
up_read(&vdev->memory_lock); \
\
return 0; \
-}
+} \
+EXPORT_SYMBOL_GPL(vfio_pci_core_ioread##size);
VFIO_IOREAD(8)
VFIO_IOREAD(16)
if (copy_from_user(&val, buf, 4))
return -EFAULT;
- ret = vfio_pci_iowrite32(vdev, test_mem,
- val, io + off);
+ ret = vfio_pci_core_iowrite32(vdev, test_mem,
+ val, io + off);
if (ret)
return ret;
} else {
- ret = vfio_pci_ioread32(vdev, test_mem,
- &val, io + off);
+ ret = vfio_pci_core_ioread32(vdev, test_mem,
+ &val, io + off);
if (ret)
return ret;
if (copy_from_user(&val, buf, 2))
return -EFAULT;
- ret = vfio_pci_iowrite16(vdev, test_mem,
- val, io + off);
+ ret = vfio_pci_core_iowrite16(vdev, test_mem,
+ val, io + off);
if (ret)
return ret;
} else {
- ret = vfio_pci_ioread16(vdev, test_mem,
- &val, io + off);
+ ret = vfio_pci_core_ioread16(vdev, test_mem,
+ &val, io + off);
if (ret)
return ret;
if (copy_from_user(&val, buf, 1))
return -EFAULT;
- ret = vfio_pci_iowrite8(vdev, test_mem,
- val, io + off);
+ ret = vfio_pci_core_iowrite8(vdev, test_mem,
+ val, io + off);
if (ret)
return ret;
} else {
- ret = vfio_pci_ioread8(vdev, test_mem,
- &val, io + off);
+ ret = vfio_pci_core_ioread8(vdev, test_mem,
+ &val, io + off);
if (ret)
return ret;
return done;
}
-static int vfio_pci_setup_barmap(struct vfio_pci_core_device *vdev, int bar)
+int vfio_pci_core_setup_barmap(struct vfio_pci_core_device *vdev, int bar)
{
struct pci_dev *pdev = vdev->pdev;
int ret;
return 0;
}
+EXPORT_SYMBOL_GPL(vfio_pci_core_setup_barmap);
ssize_t vfio_pci_bar_rw(struct vfio_pci_core_device *vdev, char __user *buf,
size_t count, loff_t *ppos, bool iswrite)
}
x_end = end;
} else {
- int ret = vfio_pci_setup_barmap(vdev, bar);
+ int ret = vfio_pci_core_setup_barmap(vdev, bar);
if (ret) {
done = ret;
goto out;
{
switch (ioeventfd->count) {
case 1:
- vfio_pci_iowrite8(ioeventfd->vdev, test_mem,
- ioeventfd->data, ioeventfd->addr);
+ vfio_pci_core_iowrite8(ioeventfd->vdev, test_mem,
+ ioeventfd->data, ioeventfd->addr);
break;
case 2:
- vfio_pci_iowrite16(ioeventfd->vdev, test_mem,
- ioeventfd->data, ioeventfd->addr);
+ vfio_pci_core_iowrite16(ioeventfd->vdev, test_mem,
+ ioeventfd->data, ioeventfd->addr);
break;
case 4:
- vfio_pci_iowrite32(ioeventfd->vdev, test_mem,
- ioeventfd->data, ioeventfd->addr);
+ vfio_pci_core_iowrite32(ioeventfd->vdev, test_mem,
+ ioeventfd->data, ioeventfd->addr);
break;
#ifdef iowrite64
case 8:
- vfio_pci_iowrite64(ioeventfd->vdev, test_mem,
- ioeventfd->data, ioeventfd->addr);
+ vfio_pci_core_iowrite64(ioeventfd->vdev, test_mem,
+ ioeventfd->data, ioeventfd->addr);
break;
#endif
}
return -EINVAL;
#endif
- ret = vfio_pci_setup_barmap(vdev, bar);
+ ret = vfio_pci_core_setup_barmap(vdev, bar);
if (ret)
return ret;
--- /dev/null
+# SPDX-License-Identifier: GPL-2.0-only
+config VIRTIO_VFIO_PCI
+ tristate "VFIO support for VIRTIO NET PCI devices"
+ depends on VIRTIO_PCI && VIRTIO_PCI_ADMIN_LEGACY
+ select VFIO_PCI_CORE
+ help
+ This provides support for exposing VIRTIO NET VF devices which support
+ legacy IO access, using the VFIO framework that can work with a legacy
+ virtio driver in the guest.
+ Based on PCIe spec, VFs do not support I/O Space.
+ As of that this driver emulates I/O BAR in software to let a VF be
+ seen as a transitional device by its users and let it work with
+ a legacy driver.
+
+ If you don't know what to do here, say N.
--- /dev/null
+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_VIRTIO_VFIO_PCI) += virtio-vfio-pci.o
+virtio-vfio-pci-y := main.o
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2023, NVIDIA CORPORATION & AFFILIATES. All rights reserved
+ */
+
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/pci.h>
+#include <linux/pm_runtime.h>
+#include <linux/types.h>
+#include <linux/uaccess.h>
+#include <linux/vfio.h>
+#include <linux/vfio_pci_core.h>
+#include <linux/virtio_pci.h>
+#include <linux/virtio_net.h>
+#include <linux/virtio_pci_admin.h>
+
+struct virtiovf_pci_core_device {
+ struct vfio_pci_core_device core_device;
+ u8 *bar0_virtual_buf;
+ /* synchronize access to the virtual buf */
+ struct mutex bar_mutex;
+ void __iomem *notify_addr;
+ u64 notify_offset;
+ __le32 pci_base_addr_0;
+ __le16 pci_cmd;
+ u8 bar0_virtual_buf_size;
+ u8 notify_bar;
+};
+
+static int
+virtiovf_issue_legacy_rw_cmd(struct virtiovf_pci_core_device *virtvdev,
+ loff_t pos, char __user *buf,
+ size_t count, bool read)
+{
+ bool msix_enabled =
+ (virtvdev->core_device.irq_type == VFIO_PCI_MSIX_IRQ_INDEX);
+ struct pci_dev *pdev = virtvdev->core_device.pdev;
+ u8 *bar0_buf = virtvdev->bar0_virtual_buf;
+ bool common;
+ u8 offset;
+ int ret;
+
+ common = pos < VIRTIO_PCI_CONFIG_OFF(msix_enabled);
+ /* offset within the relevant configuration area */
+ offset = common ? pos : pos - VIRTIO_PCI_CONFIG_OFF(msix_enabled);
+ mutex_lock(&virtvdev->bar_mutex);
+ if (read) {
+ if (common)
+ ret = virtio_pci_admin_legacy_common_io_read(pdev, offset,
+ count, bar0_buf + pos);
+ else
+ ret = virtio_pci_admin_legacy_device_io_read(pdev, offset,
+ count, bar0_buf + pos);
+ if (ret)
+ goto out;
+ if (copy_to_user(buf, bar0_buf + pos, count))
+ ret = -EFAULT;
+ } else {
+ if (copy_from_user(bar0_buf + pos, buf, count)) {
+ ret = -EFAULT;
+ goto out;
+ }
+
+ if (common)
+ ret = virtio_pci_admin_legacy_common_io_write(pdev, offset,
+ count, bar0_buf + pos);
+ else
+ ret = virtio_pci_admin_legacy_device_io_write(pdev, offset,
+ count, bar0_buf + pos);
+ }
+out:
+ mutex_unlock(&virtvdev->bar_mutex);
+ return ret;
+}
+
+static int
+virtiovf_pci_bar0_rw(struct virtiovf_pci_core_device *virtvdev,
+ loff_t pos, char __user *buf,
+ size_t count, bool read)
+{
+ struct vfio_pci_core_device *core_device = &virtvdev->core_device;
+ struct pci_dev *pdev = core_device->pdev;
+ u16 queue_notify;
+ int ret;
+
+ if (!(le16_to_cpu(virtvdev->pci_cmd) & PCI_COMMAND_IO))
+ return -EIO;
+
+ if (pos + count > virtvdev->bar0_virtual_buf_size)
+ return -EINVAL;
+
+ ret = pm_runtime_resume_and_get(&pdev->dev);
+ if (ret) {
+ pci_info_ratelimited(pdev, "runtime resume failed %d\n", ret);
+ return -EIO;
+ }
+
+ switch (pos) {
+ case VIRTIO_PCI_QUEUE_NOTIFY:
+ if (count != sizeof(queue_notify)) {
+ ret = -EINVAL;
+ goto end;
+ }
+ if (read) {
+ ret = vfio_pci_core_ioread16(core_device, true, &queue_notify,
+ virtvdev->notify_addr);
+ if (ret)
+ goto end;
+ if (copy_to_user(buf, &queue_notify,
+ sizeof(queue_notify))) {
+ ret = -EFAULT;
+ goto end;
+ }
+ } else {
+ if (copy_from_user(&queue_notify, buf, count)) {
+ ret = -EFAULT;
+ goto end;
+ }
+ ret = vfio_pci_core_iowrite16(core_device, true, queue_notify,
+ virtvdev->notify_addr);
+ }
+ break;
+ default:
+ ret = virtiovf_issue_legacy_rw_cmd(virtvdev, pos, buf, count,
+ read);
+ }
+
+end:
+ pm_runtime_put(&pdev->dev);
+ return ret ? ret : count;
+}
+
+static bool range_intersect_range(loff_t range1_start, size_t count1,
+ loff_t range2_start, size_t count2,
+ loff_t *start_offset,
+ size_t *intersect_count,
+ size_t *register_offset)
+{
+ if (range1_start <= range2_start &&
+ range1_start + count1 > range2_start) {
+ *start_offset = range2_start - range1_start;
+ *intersect_count = min_t(size_t, count2,
+ range1_start + count1 - range2_start);
+ *register_offset = 0;
+ return true;
+ }
+
+ if (range1_start > range2_start &&
+ range1_start < range2_start + count2) {
+ *start_offset = 0;
+ *intersect_count = min_t(size_t, count1,
+ range2_start + count2 - range1_start);
+ *register_offset = range1_start - range2_start;
+ return true;
+ }
+
+ return false;
+}
+
+static ssize_t virtiovf_pci_read_config(struct vfio_device *core_vdev,
+ char __user *buf, size_t count,
+ loff_t *ppos)
+{
+ struct virtiovf_pci_core_device *virtvdev = container_of(
+ core_vdev, struct virtiovf_pci_core_device, core_device.vdev);
+ loff_t pos = *ppos & VFIO_PCI_OFFSET_MASK;
+ size_t register_offset;
+ loff_t copy_offset;
+ size_t copy_count;
+ __le32 val32;
+ __le16 val16;
+ u8 val8;
+ int ret;
+
+ ret = vfio_pci_core_read(core_vdev, buf, count, ppos);
+ if (ret < 0)
+ return ret;
+
+ if (range_intersect_range(pos, count, PCI_DEVICE_ID, sizeof(val16),
+ ©_offset, ©_count, ®ister_offset)) {
+ val16 = cpu_to_le16(VIRTIO_TRANS_ID_NET);
+ if (copy_to_user(buf + copy_offset, (void *)&val16 + register_offset, copy_count))
+ return -EFAULT;
+ }
+
+ if ((le16_to_cpu(virtvdev->pci_cmd) & PCI_COMMAND_IO) &&
+ range_intersect_range(pos, count, PCI_COMMAND, sizeof(val16),
+ ©_offset, ©_count, ®ister_offset)) {
+ if (copy_from_user((void *)&val16 + register_offset, buf + copy_offset,
+ copy_count))
+ return -EFAULT;
+ val16 |= cpu_to_le16(PCI_COMMAND_IO);
+ if (copy_to_user(buf + copy_offset, (void *)&val16 + register_offset,
+ copy_count))
+ return -EFAULT;
+ }
+
+ if (range_intersect_range(pos, count, PCI_REVISION_ID, sizeof(val8),
+ ©_offset, ©_count, ®ister_offset)) {
+ /* Transional needs to have revision 0 */
+ val8 = 0;
+ if (copy_to_user(buf + copy_offset, &val8, copy_count))
+ return -EFAULT;
+ }
+
+ if (range_intersect_range(pos, count, PCI_BASE_ADDRESS_0, sizeof(val32),
+ ©_offset, ©_count, ®ister_offset)) {
+ u32 bar_mask = ~(virtvdev->bar0_virtual_buf_size - 1);
+ u32 pci_base_addr_0 = le32_to_cpu(virtvdev->pci_base_addr_0);
+
+ val32 = cpu_to_le32((pci_base_addr_0 & bar_mask) | PCI_BASE_ADDRESS_SPACE_IO);
+ if (copy_to_user(buf + copy_offset, (void *)&val32 + register_offset, copy_count))
+ return -EFAULT;
+ }
+
+ if (range_intersect_range(pos, count, PCI_SUBSYSTEM_ID, sizeof(val16),
+ ©_offset, ©_count, ®ister_offset)) {
+ /*
+ * Transitional devices use the PCI subsystem device id as
+ * virtio device id, same as legacy driver always did.
+ */
+ val16 = cpu_to_le16(VIRTIO_ID_NET);
+ if (copy_to_user(buf + copy_offset, (void *)&val16 + register_offset,
+ copy_count))
+ return -EFAULT;
+ }
+
+ if (range_intersect_range(pos, count, PCI_SUBSYSTEM_VENDOR_ID, sizeof(val16),
+ ©_offset, ©_count, ®ister_offset)) {
+ val16 = cpu_to_le16(PCI_VENDOR_ID_REDHAT_QUMRANET);
+ if (copy_to_user(buf + copy_offset, (void *)&val16 + register_offset,
+ copy_count))
+ return -EFAULT;
+ }
+
+ return count;
+}
+
+static ssize_t
+virtiovf_pci_core_read(struct vfio_device *core_vdev, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct virtiovf_pci_core_device *virtvdev = container_of(
+ core_vdev, struct virtiovf_pci_core_device, core_device.vdev);
+ unsigned int index = VFIO_PCI_OFFSET_TO_INDEX(*ppos);
+ loff_t pos = *ppos & VFIO_PCI_OFFSET_MASK;
+
+ if (!count)
+ return 0;
+
+ if (index == VFIO_PCI_CONFIG_REGION_INDEX)
+ return virtiovf_pci_read_config(core_vdev, buf, count, ppos);
+
+ if (index == VFIO_PCI_BAR0_REGION_INDEX)
+ return virtiovf_pci_bar0_rw(virtvdev, pos, buf, count, true);
+
+ return vfio_pci_core_read(core_vdev, buf, count, ppos);
+}
+
+static ssize_t virtiovf_pci_write_config(struct vfio_device *core_vdev,
+ const char __user *buf, size_t count,
+ loff_t *ppos)
+{
+ struct virtiovf_pci_core_device *virtvdev = container_of(
+ core_vdev, struct virtiovf_pci_core_device, core_device.vdev);
+ loff_t pos = *ppos & VFIO_PCI_OFFSET_MASK;
+ size_t register_offset;
+ loff_t copy_offset;
+ size_t copy_count;
+
+ if (range_intersect_range(pos, count, PCI_COMMAND, sizeof(virtvdev->pci_cmd),
+ ©_offset, ©_count,
+ ®ister_offset)) {
+ if (copy_from_user((void *)&virtvdev->pci_cmd + register_offset,
+ buf + copy_offset,
+ copy_count))
+ return -EFAULT;
+ }
+
+ if (range_intersect_range(pos, count, PCI_BASE_ADDRESS_0,
+ sizeof(virtvdev->pci_base_addr_0),
+ ©_offset, ©_count,
+ ®ister_offset)) {
+ if (copy_from_user((void *)&virtvdev->pci_base_addr_0 + register_offset,
+ buf + copy_offset,
+ copy_count))
+ return -EFAULT;
+ }
+
+ return vfio_pci_core_write(core_vdev, buf, count, ppos);
+}
+
+static ssize_t
+virtiovf_pci_core_write(struct vfio_device *core_vdev, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct virtiovf_pci_core_device *virtvdev = container_of(
+ core_vdev, struct virtiovf_pci_core_device, core_device.vdev);
+ unsigned int index = VFIO_PCI_OFFSET_TO_INDEX(*ppos);
+ loff_t pos = *ppos & VFIO_PCI_OFFSET_MASK;
+
+ if (!count)
+ return 0;
+
+ if (index == VFIO_PCI_CONFIG_REGION_INDEX)
+ return virtiovf_pci_write_config(core_vdev, buf, count, ppos);
+
+ if (index == VFIO_PCI_BAR0_REGION_INDEX)
+ return virtiovf_pci_bar0_rw(virtvdev, pos, (char __user *)buf, count, false);
+
+ return vfio_pci_core_write(core_vdev, buf, count, ppos);
+}
+
+static int
+virtiovf_pci_ioctl_get_region_info(struct vfio_device *core_vdev,
+ unsigned int cmd, unsigned long arg)
+{
+ struct virtiovf_pci_core_device *virtvdev = container_of(
+ core_vdev, struct virtiovf_pci_core_device, core_device.vdev);
+ unsigned long minsz = offsetofend(struct vfio_region_info, offset);
+ void __user *uarg = (void __user *)arg;
+ struct vfio_region_info info = {};
+
+ if (copy_from_user(&info, uarg, minsz))
+ return -EFAULT;
+
+ if (info.argsz < minsz)
+ return -EINVAL;
+
+ switch (info.index) {
+ case VFIO_PCI_BAR0_REGION_INDEX:
+ info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
+ info.size = virtvdev->bar0_virtual_buf_size;
+ info.flags = VFIO_REGION_INFO_FLAG_READ |
+ VFIO_REGION_INFO_FLAG_WRITE;
+ return copy_to_user(uarg, &info, minsz) ? -EFAULT : 0;
+ default:
+ return vfio_pci_core_ioctl(core_vdev, cmd, arg);
+ }
+}
+
+static long
+virtiovf_vfio_pci_core_ioctl(struct vfio_device *core_vdev, unsigned int cmd,
+ unsigned long arg)
+{
+ switch (cmd) {
+ case VFIO_DEVICE_GET_REGION_INFO:
+ return virtiovf_pci_ioctl_get_region_info(core_vdev, cmd, arg);
+ default:
+ return vfio_pci_core_ioctl(core_vdev, cmd, arg);
+ }
+}
+
+static int
+virtiovf_set_notify_addr(struct virtiovf_pci_core_device *virtvdev)
+{
+ struct vfio_pci_core_device *core_device = &virtvdev->core_device;
+ int ret;
+
+ /*
+ * Setup the BAR where the 'notify' exists to be used by vfio as well
+ * This will let us mmap it only once and use it when needed.
+ */
+ ret = vfio_pci_core_setup_barmap(core_device,
+ virtvdev->notify_bar);
+ if (ret)
+ return ret;
+
+ virtvdev->notify_addr = core_device->barmap[virtvdev->notify_bar] +
+ virtvdev->notify_offset;
+ return 0;
+}
+
+static int virtiovf_pci_open_device(struct vfio_device *core_vdev)
+{
+ struct virtiovf_pci_core_device *virtvdev = container_of(
+ core_vdev, struct virtiovf_pci_core_device, core_device.vdev);
+ struct vfio_pci_core_device *vdev = &virtvdev->core_device;
+ int ret;
+
+ ret = vfio_pci_core_enable(vdev);
+ if (ret)
+ return ret;
+
+ if (virtvdev->bar0_virtual_buf) {
+ /*
+ * Upon close_device() the vfio_pci_core_disable() is called
+ * and will close all the previous mmaps, so it seems that the
+ * valid life cycle for the 'notify' addr is per open/close.
+ */
+ ret = virtiovf_set_notify_addr(virtvdev);
+ if (ret) {
+ vfio_pci_core_disable(vdev);
+ return ret;
+ }
+ }
+
+ vfio_pci_core_finish_enable(vdev);
+ return 0;
+}
+
+static int virtiovf_get_device_config_size(unsigned short device)
+{
+ /* Network card */
+ return offsetofend(struct virtio_net_config, status);
+}
+
+static int virtiovf_read_notify_info(struct virtiovf_pci_core_device *virtvdev)
+{
+ u64 offset;
+ int ret;
+ u8 bar;
+
+ ret = virtio_pci_admin_legacy_io_notify_info(virtvdev->core_device.pdev,
+ VIRTIO_ADMIN_CMD_NOTIFY_INFO_FLAGS_OWNER_MEM,
+ &bar, &offset);
+ if (ret)
+ return ret;
+
+ virtvdev->notify_bar = bar;
+ virtvdev->notify_offset = offset;
+ return 0;
+}
+
+static int virtiovf_pci_init_device(struct vfio_device *core_vdev)
+{
+ struct virtiovf_pci_core_device *virtvdev = container_of(
+ core_vdev, struct virtiovf_pci_core_device, core_device.vdev);
+ struct pci_dev *pdev;
+ int ret;
+
+ ret = vfio_pci_core_init_dev(core_vdev);
+ if (ret)
+ return ret;
+
+ pdev = virtvdev->core_device.pdev;
+ ret = virtiovf_read_notify_info(virtvdev);
+ if (ret)
+ return ret;
+
+ virtvdev->bar0_virtual_buf_size = VIRTIO_PCI_CONFIG_OFF(true) +
+ virtiovf_get_device_config_size(pdev->device);
+ BUILD_BUG_ON(!is_power_of_2(virtvdev->bar0_virtual_buf_size));
+ virtvdev->bar0_virtual_buf = kzalloc(virtvdev->bar0_virtual_buf_size,
+ GFP_KERNEL);
+ if (!virtvdev->bar0_virtual_buf)
+ return -ENOMEM;
+ mutex_init(&virtvdev->bar_mutex);
+ return 0;
+}
+
+static void virtiovf_pci_core_release_dev(struct vfio_device *core_vdev)
+{
+ struct virtiovf_pci_core_device *virtvdev = container_of(
+ core_vdev, struct virtiovf_pci_core_device, core_device.vdev);
+
+ kfree(virtvdev->bar0_virtual_buf);
+ vfio_pci_core_release_dev(core_vdev);
+}
+
+static const struct vfio_device_ops virtiovf_vfio_pci_tran_ops = {
+ .name = "virtio-vfio-pci-trans",
+ .init = virtiovf_pci_init_device,
+ .release = virtiovf_pci_core_release_dev,
+ .open_device = virtiovf_pci_open_device,
+ .close_device = vfio_pci_core_close_device,
+ .ioctl = virtiovf_vfio_pci_core_ioctl,
+ .device_feature = vfio_pci_core_ioctl_feature,
+ .read = virtiovf_pci_core_read,
+ .write = virtiovf_pci_core_write,
+ .mmap = vfio_pci_core_mmap,
+ .request = vfio_pci_core_request,
+ .match = vfio_pci_core_match,
+ .bind_iommufd = vfio_iommufd_physical_bind,
+ .unbind_iommufd = vfio_iommufd_physical_unbind,
+ .attach_ioas = vfio_iommufd_physical_attach_ioas,
+ .detach_ioas = vfio_iommufd_physical_detach_ioas,
+};
+
+static const struct vfio_device_ops virtiovf_vfio_pci_ops = {
+ .name = "virtio-vfio-pci",
+ .init = vfio_pci_core_init_dev,
+ .release = vfio_pci_core_release_dev,
+ .open_device = virtiovf_pci_open_device,
+ .close_device = vfio_pci_core_close_device,
+ .ioctl = vfio_pci_core_ioctl,
+ .device_feature = vfio_pci_core_ioctl_feature,
+ .read = vfio_pci_core_read,
+ .write = vfio_pci_core_write,
+ .mmap = vfio_pci_core_mmap,
+ .request = vfio_pci_core_request,
+ .match = vfio_pci_core_match,
+ .bind_iommufd = vfio_iommufd_physical_bind,
+ .unbind_iommufd = vfio_iommufd_physical_unbind,
+ .attach_ioas = vfio_iommufd_physical_attach_ioas,
+ .detach_ioas = vfio_iommufd_physical_detach_ioas,
+};
+
+static bool virtiovf_bar0_exists(struct pci_dev *pdev)
+{
+ struct resource *res = pdev->resource;
+
+ return res->flags;
+}
+
+static int virtiovf_pci_probe(struct pci_dev *pdev,
+ const struct pci_device_id *id)
+{
+ const struct vfio_device_ops *ops = &virtiovf_vfio_pci_ops;
+ struct virtiovf_pci_core_device *virtvdev;
+ int ret;
+
+ if (pdev->is_virtfn && virtio_pci_admin_has_legacy_io(pdev) &&
+ !virtiovf_bar0_exists(pdev))
+ ops = &virtiovf_vfio_pci_tran_ops;
+
+ virtvdev = vfio_alloc_device(virtiovf_pci_core_device, core_device.vdev,
+ &pdev->dev, ops);
+ if (IS_ERR(virtvdev))
+ return PTR_ERR(virtvdev);
+
+ dev_set_drvdata(&pdev->dev, &virtvdev->core_device);
+ ret = vfio_pci_core_register_device(&virtvdev->core_device);
+ if (ret)
+ goto out;
+ return 0;
+out:
+ vfio_put_device(&virtvdev->core_device.vdev);
+ return ret;
+}
+
+static void virtiovf_pci_remove(struct pci_dev *pdev)
+{
+ struct virtiovf_pci_core_device *virtvdev = dev_get_drvdata(&pdev->dev);
+
+ vfio_pci_core_unregister_device(&virtvdev->core_device);
+ vfio_put_device(&virtvdev->core_device.vdev);
+}
+
+static const struct pci_device_id virtiovf_pci_table[] = {
+ /* Only virtio-net is supported/tested so far */
+ { PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_REDHAT_QUMRANET, 0x1041) },
+ {}
+};
+
+MODULE_DEVICE_TABLE(pci, virtiovf_pci_table);
+
+static void virtiovf_pci_aer_reset_done(struct pci_dev *pdev)
+{
+ struct virtiovf_pci_core_device *virtvdev = dev_get_drvdata(&pdev->dev);
+
+ virtvdev->pci_cmd = 0;
+}
+
+static const struct pci_error_handlers virtiovf_err_handlers = {
+ .reset_done = virtiovf_pci_aer_reset_done,
+ .error_detected = vfio_pci_core_aer_err_detected,
+};
+
+static struct pci_driver virtiovf_pci_driver = {
+ .name = KBUILD_MODNAME,
+ .id_table = virtiovf_pci_table,
+ .probe = virtiovf_pci_probe,
+ .remove = virtiovf_pci_remove,
+ .err_handler = &virtiovf_err_handlers,
+ .driver_managed_dma = true,
+};
+
+module_pci_driver(virtiovf_pci_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Yishai Hadas <yishaih@nvidia.com>");
+MODULE_DESCRIPTION(
+ "VIRTIO VFIO PCI - User Level meta-driver for VIRTIO NET devices");
}
#endif
+#ifdef CONFIG_VFIO_DEBUGFS
+void vfio_debugfs_create_root(void);
+void vfio_debugfs_remove_root(void);
+
+void vfio_device_debugfs_init(struct vfio_device *vdev);
+void vfio_device_debugfs_exit(struct vfio_device *vdev);
+#else
+static inline void vfio_debugfs_create_root(void) { }
+static inline void vfio_debugfs_remove_root(void) { }
+
+static inline void vfio_device_debugfs_init(struct vfio_device *vdev) { }
+static inline void vfio_device_debugfs_exit(struct vfio_device *vdev) { }
+#endif /* CONFIG_VFIO_DEBUGFS */
+
#endif
list_for_each_entry(d, &iommu->domain_list, next) {
ret = iommu_map(d->domain, iova, (phys_addr_t)pfn << PAGE_SHIFT,
npage << PAGE_SHIFT, prot | IOMMU_CACHE,
- GFP_KERNEL);
+ GFP_KERNEL_ACCOUNT);
if (ret)
goto unwind;
}
ret = iommu_map(domain->domain, iova, phys, size,
- dma->prot | IOMMU_CACHE, GFP_KERNEL);
+ dma->prot | IOMMU_CACHE,
+ GFP_KERNEL_ACCOUNT);
if (ret) {
if (!dma->iommu_mapped) {
vfio_unpin_pages_remote(dma, iova,
continue;
ret = iommu_map(domain->domain, start, page_to_phys(pages), PAGE_SIZE * 2,
- IOMMU_READ | IOMMU_WRITE | IOMMU_CACHE, GFP_KERNEL);
+ IOMMU_READ | IOMMU_WRITE | IOMMU_CACHE,
+ GFP_KERNEL_ACCOUNT);
if (!ret) {
size_t unmapped = iommu_unmap(domain->domain, start, PAGE_SIZE);
refcount_set(&device->refcount, 1);
vfio_device_group_register(device);
+ vfio_device_debugfs_init(device);
return 0;
err_out:
}
}
+ vfio_device_debugfs_exit(device);
/* Balances vfio_device_set_group in register path */
vfio_device_remove_group(device);
}
if (ret)
goto err_alloc_dev_chrdev;
+ vfio_debugfs_create_root();
pr_info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
return 0;
static void __exit vfio_cleanup(void)
{
+ vfio_debugfs_remove_root();
ida_destroy(&vfio.device_ida);
vfio_cdev_cleanup();
class_destroy(vfio.device_class);
If unsure, say M.
+config VIRTIO_PCI_ADMIN_LEGACY
+ bool
+ depends on VIRTIO_PCI && (X86 || COMPILE_TEST)
+ default y
+
config VIRTIO_PCI_LEGACY
bool "Support for legacy virtio draft 0.9.X and older devices"
default y
obj-$(CONFIG_VIRTIO_PCI) += virtio_pci.o
virtio_pci-y := virtio_pci_modern.o virtio_pci_common.o
virtio_pci-$(CONFIG_VIRTIO_PCI_LEGACY) += virtio_pci_legacy.o
+virtio_pci-$(CONFIG_VIRTIO_PCI_ADMIN_LEGACY) += virtio_pci_admin_legacy_io.o
obj-$(CONFIG_VIRTIO_BALLOON) += virtio_balloon.o
obj-$(CONFIG_VIRTIO_INPUT) += virtio_input.o
obj-$(CONFIG_VIRTIO_VDPA) += virtio_vdpa.o
if (err)
goto err;
+ if (dev->config->create_avq) {
+ err = dev->config->create_avq(dev);
+ if (err)
+ goto err;
+ }
+
err = drv->probe(dev);
if (err)
- goto err;
+ goto err_probe;
/* If probe didn't do it, mark device DRIVER_OK ourselves. */
if (!(dev->config->get_status(dev) & VIRTIO_CONFIG_S_DRIVER_OK))
virtio_config_enable(dev);
return 0;
+
+err_probe:
+ if (dev->config->destroy_avq)
+ dev->config->destroy_avq(dev);
err:
virtio_add_status(dev, VIRTIO_CONFIG_S_FAILED);
return err;
drv->remove(dev);
+ if (dev->config->destroy_avq)
+ dev->config->destroy_avq(dev);
+
/* Driver should have reset device. */
WARN_ON_ONCE(dev->config->get_status(dev));
int virtio_device_freeze(struct virtio_device *dev)
{
struct virtio_driver *drv = drv_to_virtio(dev->dev.driver);
+ int ret;
virtio_config_disable(dev);
dev->failed = dev->config->get_status(dev) & VIRTIO_CONFIG_S_FAILED;
- if (drv && drv->freeze)
- return drv->freeze(dev);
+ if (drv && drv->freeze) {
+ ret = drv->freeze(dev);
+ if (ret)
+ return ret;
+ }
+
+ if (dev->config->destroy_avq)
+ dev->config->destroy_avq(dev);
return 0;
}
if (ret)
goto err;
+ if (dev->config->create_avq) {
+ ret = dev->config->create_avq(dev);
+ if (ret)
+ goto err;
+ }
+
if (drv->restore) {
ret = drv->restore(dev);
if (ret)
- goto err;
+ goto err_restore;
}
/* If restore didn't do it, mark device DRIVER_OK ourselves. */
return 0;
+err_restore:
+ if (dev->config->destroy_avq)
+ dev->config->destroy_avq(dev);
err:
virtio_add_status(dev, VIRTIO_CONFIG_S_FAILED);
return ret;
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2023, NVIDIA CORPORATION & AFFILIATES. All rights reserved
+ */
+
+#include <linux/virtio_pci_admin.h>
+#include "virtio_pci_common.h"
+
+/*
+ * virtio_pci_admin_has_legacy_io - Checks whether the legacy IO
+ * commands are supported
+ * @dev: VF pci_dev
+ *
+ * Returns true on success.
+ */
+bool virtio_pci_admin_has_legacy_io(struct pci_dev *pdev)
+{
+ struct virtio_device *virtio_dev = virtio_pci_vf_get_pf_dev(pdev);
+ struct virtio_pci_device *vp_dev;
+
+ if (!virtio_dev)
+ return false;
+
+ if (!virtio_has_feature(virtio_dev, VIRTIO_F_ADMIN_VQ))
+ return false;
+
+ vp_dev = to_vp_device(virtio_dev);
+
+ if ((vp_dev->admin_vq.supported_cmds & VIRTIO_LEGACY_ADMIN_CMD_BITMAP) ==
+ VIRTIO_LEGACY_ADMIN_CMD_BITMAP)
+ return true;
+ return false;
+}
+EXPORT_SYMBOL_GPL(virtio_pci_admin_has_legacy_io);
+
+static int virtio_pci_admin_legacy_io_write(struct pci_dev *pdev, u16 opcode,
+ u8 offset, u8 size, u8 *buf)
+{
+ struct virtio_device *virtio_dev = virtio_pci_vf_get_pf_dev(pdev);
+ struct virtio_admin_cmd_legacy_wr_data *data;
+ struct virtio_admin_cmd cmd = {};
+ struct scatterlist data_sg;
+ int vf_id;
+ int ret;
+
+ if (!virtio_dev)
+ return -ENODEV;
+
+ vf_id = pci_iov_vf_id(pdev);
+ if (vf_id < 0)
+ return vf_id;
+
+ data = kzalloc(sizeof(*data) + size, GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->offset = offset;
+ memcpy(data->registers, buf, size);
+ sg_init_one(&data_sg, data, sizeof(*data) + size);
+ cmd.opcode = cpu_to_le16(opcode);
+ cmd.group_type = cpu_to_le16(VIRTIO_ADMIN_GROUP_TYPE_SRIOV);
+ cmd.group_member_id = cpu_to_le64(vf_id + 1);
+ cmd.data_sg = &data_sg;
+ ret = vp_modern_admin_cmd_exec(virtio_dev, &cmd);
+
+ kfree(data);
+ return ret;
+}
+
+/*
+ * virtio_pci_admin_legacy_io_write_common - Write legacy common configuration
+ * of a member device
+ * @dev: VF pci_dev
+ * @offset: starting byte offset within the common configuration area to write to
+ * @size: size of the data to write
+ * @buf: buffer which holds the data
+ *
+ * Note: caller must serialize access for the given device.
+ * Returns 0 on success, or negative on failure.
+ */
+int virtio_pci_admin_legacy_common_io_write(struct pci_dev *pdev, u8 offset,
+ u8 size, u8 *buf)
+{
+ return virtio_pci_admin_legacy_io_write(pdev,
+ VIRTIO_ADMIN_CMD_LEGACY_COMMON_CFG_WRITE,
+ offset, size, buf);
+}
+EXPORT_SYMBOL_GPL(virtio_pci_admin_legacy_common_io_write);
+
+/*
+ * virtio_pci_admin_legacy_io_write_device - Write legacy device configuration
+ * of a member device
+ * @dev: VF pci_dev
+ * @offset: starting byte offset within the device configuration area to write to
+ * @size: size of the data to write
+ * @buf: buffer which holds the data
+ *
+ * Note: caller must serialize access for the given device.
+ * Returns 0 on success, or negative on failure.
+ */
+int virtio_pci_admin_legacy_device_io_write(struct pci_dev *pdev, u8 offset,
+ u8 size, u8 *buf)
+{
+ return virtio_pci_admin_legacy_io_write(pdev,
+ VIRTIO_ADMIN_CMD_LEGACY_DEV_CFG_WRITE,
+ offset, size, buf);
+}
+EXPORT_SYMBOL_GPL(virtio_pci_admin_legacy_device_io_write);
+
+static int virtio_pci_admin_legacy_io_read(struct pci_dev *pdev, u16 opcode,
+ u8 offset, u8 size, u8 *buf)
+{
+ struct virtio_device *virtio_dev = virtio_pci_vf_get_pf_dev(pdev);
+ struct virtio_admin_cmd_legacy_rd_data *data;
+ struct scatterlist data_sg, result_sg;
+ struct virtio_admin_cmd cmd = {};
+ int vf_id;
+ int ret;
+
+ if (!virtio_dev)
+ return -ENODEV;
+
+ vf_id = pci_iov_vf_id(pdev);
+ if (vf_id < 0)
+ return vf_id;
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->offset = offset;
+ sg_init_one(&data_sg, data, sizeof(*data));
+ sg_init_one(&result_sg, buf, size);
+ cmd.opcode = cpu_to_le16(opcode);
+ cmd.group_type = cpu_to_le16(VIRTIO_ADMIN_GROUP_TYPE_SRIOV);
+ cmd.group_member_id = cpu_to_le64(vf_id + 1);
+ cmd.data_sg = &data_sg;
+ cmd.result_sg = &result_sg;
+ ret = vp_modern_admin_cmd_exec(virtio_dev, &cmd);
+
+ kfree(data);
+ return ret;
+}
+
+/*
+ * virtio_pci_admin_legacy_device_io_read - Read legacy device configuration of
+ * a member device
+ * @dev: VF pci_dev
+ * @offset: starting byte offset within the device configuration area to read from
+ * @size: size of the data to be read
+ * @buf: buffer to hold the returned data
+ *
+ * Note: caller must serialize access for the given device.
+ * Returns 0 on success, or negative on failure.
+ */
+int virtio_pci_admin_legacy_device_io_read(struct pci_dev *pdev, u8 offset,
+ u8 size, u8 *buf)
+{
+ return virtio_pci_admin_legacy_io_read(pdev,
+ VIRTIO_ADMIN_CMD_LEGACY_DEV_CFG_READ,
+ offset, size, buf);
+}
+EXPORT_SYMBOL_GPL(virtio_pci_admin_legacy_device_io_read);
+
+/*
+ * virtio_pci_admin_legacy_common_io_read - Read legacy common configuration of
+ * a member device
+ * @dev: VF pci_dev
+ * @offset: starting byte offset within the common configuration area to read from
+ * @size: size of the data to be read
+ * @buf: buffer to hold the returned data
+ *
+ * Note: caller must serialize access for the given device.
+ * Returns 0 on success, or negative on failure.
+ */
+int virtio_pci_admin_legacy_common_io_read(struct pci_dev *pdev, u8 offset,
+ u8 size, u8 *buf)
+{
+ return virtio_pci_admin_legacy_io_read(pdev,
+ VIRTIO_ADMIN_CMD_LEGACY_COMMON_CFG_READ,
+ offset, size, buf);
+}
+EXPORT_SYMBOL_GPL(virtio_pci_admin_legacy_common_io_read);
+
+/*
+ * virtio_pci_admin_legacy_io_notify_info - Read the queue notification
+ * information for legacy interface
+ * @dev: VF pci_dev
+ * @req_bar_flags: requested bar flags
+ * @bar: on output the BAR number of the owner or member device
+ * @bar_offset: on output the offset within bar
+ *
+ * Returns 0 on success, or negative on failure.
+ */
+int virtio_pci_admin_legacy_io_notify_info(struct pci_dev *pdev,
+ u8 req_bar_flags, u8 *bar,
+ u64 *bar_offset)
+{
+ struct virtio_device *virtio_dev = virtio_pci_vf_get_pf_dev(pdev);
+ struct virtio_admin_cmd_notify_info_result *result;
+ struct virtio_admin_cmd cmd = {};
+ struct scatterlist result_sg;
+ int vf_id;
+ int ret;
+
+ if (!virtio_dev)
+ return -ENODEV;
+
+ vf_id = pci_iov_vf_id(pdev);
+ if (vf_id < 0)
+ return vf_id;
+
+ result = kzalloc(sizeof(*result), GFP_KERNEL);
+ if (!result)
+ return -ENOMEM;
+
+ sg_init_one(&result_sg, result, sizeof(*result));
+ cmd.opcode = cpu_to_le16(VIRTIO_ADMIN_CMD_LEGACY_NOTIFY_INFO);
+ cmd.group_type = cpu_to_le16(VIRTIO_ADMIN_GROUP_TYPE_SRIOV);
+ cmd.group_member_id = cpu_to_le64(vf_id + 1);
+ cmd.result_sg = &result_sg;
+ ret = vp_modern_admin_cmd_exec(virtio_dev, &cmd);
+ if (!ret) {
+ struct virtio_admin_cmd_notify_info_data *entry;
+ int i;
+
+ ret = -ENOENT;
+ for (i = 0; i < VIRTIO_ADMIN_CMD_MAX_NOTIFY_INFO; i++) {
+ entry = &result->entries[i];
+ if (entry->flags == VIRTIO_ADMIN_CMD_NOTIFY_INFO_FLAGS_END)
+ break;
+ if (entry->flags != req_bar_flags)
+ continue;
+ *bar = entry->bar;
+ *bar_offset = le64_to_cpu(entry->offset);
+ ret = 0;
+ break;
+ }
+ }
+
+ kfree(result);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(virtio_pci_admin_legacy_io_notify_info);
int i;
list_for_each_entry_safe(vq, n, &vdev->vqs, list) {
+ if (vp_dev->is_avq(vdev, vq->index))
+ continue;
+
if (vp_dev->per_vq_vectors) {
int v = vp_dev->vqs[vq->index]->msix_vector;
.sriov_configure = virtio_pci_sriov_configure,
};
+struct virtio_device *virtio_pci_vf_get_pf_dev(struct pci_dev *pdev)
+{
+ struct virtio_pci_device *pf_vp_dev;
+
+ pf_vp_dev = pci_iov_get_pf_drvdata(pdev, &virtio_pci_driver);
+ if (IS_ERR(pf_vp_dev))
+ return NULL;
+
+ return &pf_vp_dev->vdev;
+}
+
module_pci_driver(virtio_pci_driver);
MODULE_AUTHOR("Anthony Liguori <aliguori@us.ibm.com>");
#include <linux/virtio_pci_modern.h>
#include <linux/highmem.h>
#include <linux/spinlock.h>
+#include <linux/mutex.h>
struct virtio_pci_vq_info {
/* the actual virtqueue */
unsigned int msix_vector;
};
+struct virtio_pci_admin_vq {
+ /* Virtqueue info associated with this admin queue. */
+ struct virtio_pci_vq_info info;
+ /* serializing admin commands execution and virtqueue deletion */
+ struct mutex cmd_lock;
+ u64 supported_cmds;
+ /* Name of the admin queue: avq.$vq_index. */
+ char name[10];
+ u16 vq_index;
+};
+
/* Our device structure */
struct virtio_pci_device {
struct virtio_device vdev;
spinlock_t lock;
struct list_head virtqueues;
- /* array of all queues for house-keeping */
+ /* Array of all virtqueues reported in the
+ * PCI common config num_queues field
+ */
struct virtio_pci_vq_info **vqs;
+ struct virtio_pci_admin_vq admin_vq;
+
/* MSI-X support */
int msix_enabled;
int intx_enabled;
void (*del_vq)(struct virtio_pci_vq_info *info);
u16 (*config_vector)(struct virtio_pci_device *vp_dev, u16 vector);
+ bool (*is_avq)(struct virtio_device *vdev, unsigned int index);
};
/* Constants for MSI-X */
int virtio_pci_modern_probe(struct virtio_pci_device *);
void virtio_pci_modern_remove(struct virtio_pci_device *);
+struct virtio_device *virtio_pci_vf_get_pf_dev(struct pci_dev *pdev);
+
+#define VIRTIO_LEGACY_ADMIN_CMD_BITMAP \
+ (BIT_ULL(VIRTIO_ADMIN_CMD_LEGACY_COMMON_CFG_WRITE) | \
+ BIT_ULL(VIRTIO_ADMIN_CMD_LEGACY_COMMON_CFG_READ) | \
+ BIT_ULL(VIRTIO_ADMIN_CMD_LEGACY_DEV_CFG_WRITE) | \
+ BIT_ULL(VIRTIO_ADMIN_CMD_LEGACY_DEV_CFG_READ) | \
+ BIT_ULL(VIRTIO_ADMIN_CMD_LEGACY_NOTIFY_INFO))
+
+/* Unlike modern drivers which support hardware virtio devices, legacy drivers
+ * assume software-based devices: e.g. they don't use proper memory barriers
+ * on ARM, use big endian on PPC, etc. X86 drivers are mostly ok though, more
+ * or less by chance. For now, only support legacy IO on X86.
+ */
+#ifdef CONFIG_VIRTIO_PCI_ADMIN_LEGACY
+#define VIRTIO_ADMIN_CMD_BITMAP VIRTIO_LEGACY_ADMIN_CMD_BITMAP
+#else
+#define VIRTIO_ADMIN_CMD_BITMAP 0
+#endif
+
+int vp_modern_admin_cmd_exec(struct virtio_device *vdev,
+ struct virtio_admin_cmd *cmd);
+
#endif
#define VIRTIO_RING_NO_LEGACY
#include "virtio_pci_common.h"
+#define VIRTIO_AVQ_SGS_MAX 4
+
static u64 vp_get_features(struct virtio_device *vdev)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
return vp_modern_get_features(&vp_dev->mdev);
}
+static bool vp_is_avq(struct virtio_device *vdev, unsigned int index)
+{
+ struct virtio_pci_device *vp_dev = to_vp_device(vdev);
+
+ if (!virtio_has_feature(vdev, VIRTIO_F_ADMIN_VQ))
+ return false;
+
+ return index == vp_dev->admin_vq.vq_index;
+}
+
+static int virtqueue_exec_admin_cmd(struct virtio_pci_admin_vq *admin_vq,
+ u16 opcode,
+ struct scatterlist **sgs,
+ unsigned int out_num,
+ unsigned int in_num,
+ void *data)
+{
+ struct virtqueue *vq;
+ int ret, len;
+
+ vq = admin_vq->info.vq;
+ if (!vq)
+ return -EIO;
+
+ if (opcode != VIRTIO_ADMIN_CMD_LIST_QUERY &&
+ opcode != VIRTIO_ADMIN_CMD_LIST_USE &&
+ !((1ULL << opcode) & admin_vq->supported_cmds))
+ return -EOPNOTSUPP;
+
+ ret = virtqueue_add_sgs(vq, sgs, out_num, in_num, data, GFP_KERNEL);
+ if (ret < 0)
+ return -EIO;
+
+ if (unlikely(!virtqueue_kick(vq)))
+ return -EIO;
+
+ while (!virtqueue_get_buf(vq, &len) &&
+ !virtqueue_is_broken(vq))
+ cpu_relax();
+
+ if (virtqueue_is_broken(vq))
+ return -EIO;
+
+ return 0;
+}
+
+int vp_modern_admin_cmd_exec(struct virtio_device *vdev,
+ struct virtio_admin_cmd *cmd)
+{
+ struct scatterlist *sgs[VIRTIO_AVQ_SGS_MAX], hdr, stat;
+ struct virtio_pci_device *vp_dev = to_vp_device(vdev);
+ struct virtio_admin_cmd_status *va_status;
+ unsigned int out_num = 0, in_num = 0;
+ struct virtio_admin_cmd_hdr *va_hdr;
+ u16 status;
+ int ret;
+
+ if (!virtio_has_feature(vdev, VIRTIO_F_ADMIN_VQ))
+ return -EOPNOTSUPP;
+
+ va_status = kzalloc(sizeof(*va_status), GFP_KERNEL);
+ if (!va_status)
+ return -ENOMEM;
+
+ va_hdr = kzalloc(sizeof(*va_hdr), GFP_KERNEL);
+ if (!va_hdr) {
+ ret = -ENOMEM;
+ goto err_alloc;
+ }
+
+ va_hdr->opcode = cmd->opcode;
+ va_hdr->group_type = cmd->group_type;
+ va_hdr->group_member_id = cmd->group_member_id;
+
+ /* Add header */
+ sg_init_one(&hdr, va_hdr, sizeof(*va_hdr));
+ sgs[out_num] = &hdr;
+ out_num++;
+
+ if (cmd->data_sg) {
+ sgs[out_num] = cmd->data_sg;
+ out_num++;
+ }
+
+ /* Add return status */
+ sg_init_one(&stat, va_status, sizeof(*va_status));
+ sgs[out_num + in_num] = &stat;
+ in_num++;
+
+ if (cmd->result_sg) {
+ sgs[out_num + in_num] = cmd->result_sg;
+ in_num++;
+ }
+
+ mutex_lock(&vp_dev->admin_vq.cmd_lock);
+ ret = virtqueue_exec_admin_cmd(&vp_dev->admin_vq,
+ le16_to_cpu(cmd->opcode),
+ sgs, out_num, in_num, sgs);
+ mutex_unlock(&vp_dev->admin_vq.cmd_lock);
+
+ if (ret) {
+ dev_err(&vdev->dev,
+ "Failed to execute command on admin vq: %d\n.", ret);
+ goto err_cmd_exec;
+ }
+
+ status = le16_to_cpu(va_status->status);
+ if (status != VIRTIO_ADMIN_STATUS_OK) {
+ dev_err(&vdev->dev,
+ "admin command error: status(%#x) qualifier(%#x)\n",
+ status, le16_to_cpu(va_status->status_qualifier));
+ ret = -status;
+ }
+
+err_cmd_exec:
+ kfree(va_hdr);
+err_alloc:
+ kfree(va_status);
+ return ret;
+}
+
+static void virtio_pci_admin_cmd_list_init(struct virtio_device *virtio_dev)
+{
+ struct virtio_pci_device *vp_dev = to_vp_device(virtio_dev);
+ struct virtio_admin_cmd cmd = {};
+ struct scatterlist result_sg;
+ struct scatterlist data_sg;
+ __le64 *data;
+ int ret;
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return;
+
+ sg_init_one(&result_sg, data, sizeof(*data));
+ cmd.opcode = cpu_to_le16(VIRTIO_ADMIN_CMD_LIST_QUERY);
+ cmd.group_type = cpu_to_le16(VIRTIO_ADMIN_GROUP_TYPE_SRIOV);
+ cmd.result_sg = &result_sg;
+
+ ret = vp_modern_admin_cmd_exec(virtio_dev, &cmd);
+ if (ret)
+ goto end;
+
+ *data &= cpu_to_le64(VIRTIO_ADMIN_CMD_BITMAP);
+ sg_init_one(&data_sg, data, sizeof(*data));
+ cmd.opcode = cpu_to_le16(VIRTIO_ADMIN_CMD_LIST_USE);
+ cmd.data_sg = &data_sg;
+ cmd.result_sg = NULL;
+
+ ret = vp_modern_admin_cmd_exec(virtio_dev, &cmd);
+ if (ret)
+ goto end;
+
+ vp_dev->admin_vq.supported_cmds = le64_to_cpu(*data);
+end:
+ kfree(data);
+}
+
+static void vp_modern_avq_activate(struct virtio_device *vdev)
+{
+ struct virtio_pci_device *vp_dev = to_vp_device(vdev);
+ struct virtio_pci_admin_vq *admin_vq = &vp_dev->admin_vq;
+
+ if (!virtio_has_feature(vdev, VIRTIO_F_ADMIN_VQ))
+ return;
+
+ __virtqueue_unbreak(admin_vq->info.vq);
+ virtio_pci_admin_cmd_list_init(vdev);
+}
+
+static void vp_modern_avq_deactivate(struct virtio_device *vdev)
+{
+ struct virtio_pci_device *vp_dev = to_vp_device(vdev);
+ struct virtio_pci_admin_vq *admin_vq = &vp_dev->admin_vq;
+
+ if (!virtio_has_feature(vdev, VIRTIO_F_ADMIN_VQ))
+ return;
+
+ __virtqueue_break(admin_vq->info.vq);
+}
+
static void vp_transport_features(struct virtio_device *vdev, u64 features)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
if (features & BIT_ULL(VIRTIO_F_RING_RESET))
__virtio_set_bit(vdev, VIRTIO_F_RING_RESET);
+
+ if (features & BIT_ULL(VIRTIO_F_ADMIN_VQ))
+ __virtio_set_bit(vdev, VIRTIO_F_ADMIN_VQ);
}
static int __vp_check_common_size_one_feature(struct virtio_device *vdev, u32 fbit,
if (vp_check_common_size_one_feature(vdev, VIRTIO_F_RING_RESET, queue_reset))
return -EINVAL;
+ if (vp_check_common_size_one_feature(vdev, VIRTIO_F_ADMIN_VQ, admin_queue_num))
+ return -EINVAL;
+
return 0;
}
/* We should never be setting status to 0. */
BUG_ON(status == 0);
vp_modern_set_status(&vp_dev->mdev, status);
+ if (status & VIRTIO_CONFIG_S_DRIVER_OK)
+ vp_modern_avq_activate(vdev);
}
static void vp_reset(struct virtio_device *vdev)
*/
while (vp_modern_get_status(mdev))
msleep(1);
+
+ vp_modern_avq_deactivate(vdev);
+
/* Flush pending VQ/configuration callbacks. */
vp_synchronize_vectors(vdev);
}
struct virtio_pci_modern_device *mdev = &vp_dev->mdev;
bool (*notify)(struct virtqueue *vq);
struct virtqueue *vq;
+ bool is_avq;
u16 num;
int err;
else
notify = vp_notify;
- if (index >= vp_modern_get_num_queues(mdev))
+ is_avq = vp_is_avq(&vp_dev->vdev, index);
+ if (index >= vp_modern_get_num_queues(mdev) && !is_avq)
return ERR_PTR(-EINVAL);
+ num = is_avq ?
+ VIRTIO_AVQ_SGS_MAX : vp_modern_get_queue_size(mdev, index);
/* Check if queue is either not available or already active. */
- num = vp_modern_get_queue_size(mdev, index);
if (!num || vp_modern_get_queue_enable(mdev, index))
return ERR_PTR(-ENOENT);
goto err;
}
+ if (is_avq) {
+ mutex_lock(&vp_dev->admin_vq.cmd_lock);
+ vp_dev->admin_vq.info.vq = vq;
+ mutex_unlock(&vp_dev->admin_vq.cmd_lock);
+ }
+
return vq;
err:
struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
struct virtio_pci_modern_device *mdev = &vp_dev->mdev;
+ if (vp_is_avq(&vp_dev->vdev, vq->index)) {
+ mutex_lock(&vp_dev->admin_vq.cmd_lock);
+ vp_dev->admin_vq.info.vq = NULL;
+ mutex_unlock(&vp_dev->admin_vq.cmd_lock);
+ }
+
if (vp_dev->msix_enabled)
vp_modern_queue_vector(mdev, vq->index,
VIRTIO_MSI_NO_VECTOR);
return true;
}
+static int vp_modern_create_avq(struct virtio_device *vdev)
+{
+ struct virtio_pci_device *vp_dev = to_vp_device(vdev);
+ struct virtio_pci_admin_vq *avq;
+ struct virtqueue *vq;
+ u16 admin_q_num;
+
+ if (!virtio_has_feature(vdev, VIRTIO_F_ADMIN_VQ))
+ return 0;
+
+ admin_q_num = vp_modern_avq_num(&vp_dev->mdev);
+ if (!admin_q_num)
+ return -EINVAL;
+
+ avq = &vp_dev->admin_vq;
+ avq->vq_index = vp_modern_avq_index(&vp_dev->mdev);
+ sprintf(avq->name, "avq.%u", avq->vq_index);
+ vq = vp_dev->setup_vq(vp_dev, &vp_dev->admin_vq.info, avq->vq_index, NULL,
+ avq->name, NULL, VIRTIO_MSI_NO_VECTOR);
+ if (IS_ERR(vq)) {
+ dev_err(&vdev->dev, "failed to setup admin virtqueue, err=%ld",
+ PTR_ERR(vq));
+ return PTR_ERR(vq);
+ }
+
+ vp_modern_set_queue_enable(&vp_dev->mdev, avq->info.vq->index, true);
+ return 0;
+}
+
+static void vp_modern_destroy_avq(struct virtio_device *vdev)
+{
+ struct virtio_pci_device *vp_dev = to_vp_device(vdev);
+
+ if (!virtio_has_feature(vdev, VIRTIO_F_ADMIN_VQ))
+ return;
+
+ vp_dev->del_vq(&vp_dev->admin_vq.info);
+}
+
static const struct virtio_config_ops virtio_pci_config_nodev_ops = {
.get = NULL,
.set = NULL,
.get_shm_region = vp_get_shm_region,
.disable_vq_and_reset = vp_modern_disable_vq_and_reset,
.enable_vq_after_reset = vp_modern_enable_vq_after_reset,
+ .create_avq = vp_modern_create_avq,
+ .destroy_avq = vp_modern_destroy_avq,
};
static const struct virtio_config_ops virtio_pci_config_ops = {
.get_shm_region = vp_get_shm_region,
.disable_vq_and_reset = vp_modern_disable_vq_and_reset,
.enable_vq_after_reset = vp_modern_enable_vq_after_reset,
+ .create_avq = vp_modern_create_avq,
+ .destroy_avq = vp_modern_destroy_avq,
};
/* the PCI probing function */
vp_dev->config_vector = vp_config_vector;
vp_dev->setup_vq = setup_vq;
vp_dev->del_vq = del_vq;
+ vp_dev->is_avq = vp_is_avq;
vp_dev->isr = mdev->isr;
vp_dev->vdev.id = mdev->id;
+ mutex_init(&vp_dev->admin_vq.cmd_lock);
return 0;
}
{
struct virtio_pci_modern_device *mdev = &vp_dev->mdev;
+ mutex_destroy(&vp_dev->admin_vq.cmd_lock);
vp_modern_remove(mdev);
}
offsetof(struct virtio_pci_modern_common_cfg, queue_notify_data));
BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_RESET !=
offsetof(struct virtio_pci_modern_common_cfg, queue_reset));
+ BUILD_BUG_ON(VIRTIO_PCI_COMMON_ADM_Q_IDX !=
+ offsetof(struct virtio_pci_modern_common_cfg, admin_queue_index));
+ BUILD_BUG_ON(VIRTIO_PCI_COMMON_ADM_Q_NUM !=
+ offsetof(struct virtio_pci_modern_common_cfg, admin_queue_num));
}
/*
mdev->common = vp_modern_map_capability(mdev, common,
sizeof(struct virtio_pci_common_cfg), 4, 0,
offsetofend(struct virtio_pci_modern_common_cfg,
- queue_reset),
+ admin_queue_num),
&mdev->common_len, NULL);
if (!mdev->common)
goto err_map_common;
}
EXPORT_SYMBOL_GPL(vp_modern_map_vq_notify);
+u16 vp_modern_avq_num(struct virtio_pci_modern_device *mdev)
+{
+ struct virtio_pci_modern_common_cfg __iomem *cfg;
+
+ cfg = (struct virtio_pci_modern_common_cfg __iomem *)mdev->common;
+ return vp_ioread16(&cfg->admin_queue_num);
+}
+EXPORT_SYMBOL_GPL(vp_modern_avq_num);
+
+u16 vp_modern_avq_index(struct virtio_pci_modern_device *mdev)
+{
+ struct virtio_pci_modern_common_cfg __iomem *cfg;
+
+ cfg = (struct virtio_pci_modern_common_cfg __iomem *)mdev->common;
+ return vp_ioread16(&cfg->admin_queue_index);
+}
+EXPORT_SYMBOL_GPL(vp_modern_avq_index);
+
MODULE_VERSION("0.1");
MODULE_DESCRIPTION("Modern Virtio PCI Device");
MODULE_AUTHOR("Jason Wang <jasowang@redhat.com>");
u8 iommufd_attached:1;
#endif
u8 cdev_opened:1;
+#ifdef CONFIG_DEBUG_FS
+ /*
+ * debug_root is a static property of the vfio_device
+ * which must be set prior to registering the vfio_device.
+ */
+ struct dentry *debug_root;
+#endif
};
/**
int vfio_pci_core_enable(struct vfio_pci_core_device *vdev);
void vfio_pci_core_disable(struct vfio_pci_core_device *vdev);
void vfio_pci_core_finish_enable(struct vfio_pci_core_device *vdev);
+int vfio_pci_core_setup_barmap(struct vfio_pci_core_device *vdev, int bar);
pci_ers_result_t vfio_pci_core_aer_err_detected(struct pci_dev *pdev,
pci_channel_state_t state);
+#define VFIO_IOWRITE_DECLATION(size) \
+int vfio_pci_core_iowrite##size(struct vfio_pci_core_device *vdev, \
+ bool test_mem, u##size val, void __iomem *io);
+
+VFIO_IOWRITE_DECLATION(8)
+VFIO_IOWRITE_DECLATION(16)
+VFIO_IOWRITE_DECLATION(32)
+#ifdef iowrite64
+VFIO_IOWRITE_DECLATION(64)
+#endif
+
+#define VFIO_IOREAD_DECLATION(size) \
+int vfio_pci_core_ioread##size(struct vfio_pci_core_device *vdev, \
+ bool test_mem, u##size *val, void __iomem *io);
+
+VFIO_IOREAD_DECLATION(8)
+VFIO_IOREAD_DECLATION(16)
+VFIO_IOREAD_DECLATION(32)
+
#endif /* VFIO_PCI_CORE_H */
int virtqueue_reset(struct virtqueue *vq,
void (*recycle)(struct virtqueue *vq, void *buf));
+struct virtio_admin_cmd {
+ __le16 opcode;
+ __le16 group_type;
+ __le64 group_member_id;
+ struct scatterlist *data_sg;
+ struct scatterlist *result_sg;
+};
+
/**
* struct virtio_device - representation of a device using virtio
* @index: unique position on the virtio bus
* Returns 0 on success or error status
* If disable_vq_and_reset is set, then enable_vq_after_reset must also be
* set.
+ * @create_avq: create admin virtqueue resource.
+ * @destroy_avq: destroy admin virtqueue resource.
*/
struct virtio_config_ops {
void (*get)(struct virtio_device *vdev, unsigned offset,
struct virtio_shm_region *region, u8 id);
int (*disable_vq_and_reset)(struct virtqueue *vq);
int (*enable_vq_after_reset)(struct virtqueue *vq);
+ int (*create_avq)(struct virtio_device *vdev);
+ void (*destroy_avq)(struct virtio_device *vdev);
};
/* If driver didn't advertise the feature, it will never appear. */
--- /dev/null
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_VIRTIO_PCI_ADMIN_H
+#define _LINUX_VIRTIO_PCI_ADMIN_H
+
+#include <linux/types.h>
+#include <linux/pci.h>
+
+#ifdef CONFIG_VIRTIO_PCI_ADMIN_LEGACY
+bool virtio_pci_admin_has_legacy_io(struct pci_dev *pdev);
+int virtio_pci_admin_legacy_common_io_write(struct pci_dev *pdev, u8 offset,
+ u8 size, u8 *buf);
+int virtio_pci_admin_legacy_common_io_read(struct pci_dev *pdev, u8 offset,
+ u8 size, u8 *buf);
+int virtio_pci_admin_legacy_device_io_write(struct pci_dev *pdev, u8 offset,
+ u8 size, u8 *buf);
+int virtio_pci_admin_legacy_device_io_read(struct pci_dev *pdev, u8 offset,
+ u8 size, u8 *buf);
+int virtio_pci_admin_legacy_io_notify_info(struct pci_dev *pdev,
+ u8 req_bar_flags, u8 *bar,
+ u64 *bar_offset);
+#endif
+
+#endif /* _LINUX_VIRTIO_PCI_ADMIN_H */
void vp_modern_remove(struct virtio_pci_modern_device *mdev);
int vp_modern_get_queue_reset(struct virtio_pci_modern_device *mdev, u16 index);
void vp_modern_set_queue_reset(struct virtio_pci_modern_device *mdev, u16 index);
+u16 vp_modern_avq_num(struct virtio_pci_modern_device *mdev);
+u16 vp_modern_avq_index(struct virtio_pci_modern_device *mdev);
#endif
VFIO_DEVICE_STATE_RUNNING_P2P = 5,
VFIO_DEVICE_STATE_PRE_COPY = 6,
VFIO_DEVICE_STATE_PRE_COPY_P2P = 7,
+ VFIO_DEVICE_STATE_NR,
};
/**
* rest are per-device feature bits.
*/
#define VIRTIO_TRANSPORT_F_START 28
-#define VIRTIO_TRANSPORT_F_END 41
+#define VIRTIO_TRANSPORT_F_END 42
#ifndef VIRTIO_CONFIG_NO_LEGACY
/* Do we get callbacks when the ring is completely used, even if we've
* This feature indicates that the driver can reset a queue individually.
*/
#define VIRTIO_F_RING_RESET 40
+
+/*
+ * This feature indicates that the device support administration virtqueues.
+ */
+#define VIRTIO_F_ADMIN_VQ 41
+
#endif /* _UAPI_LINUX_VIRTIO_CONFIG_H */
__le16 queue_notify_data; /* read-write */
__le16 queue_reset; /* read-write */
+
+ __le16 admin_queue_index; /* read-only */
+ __le16 admin_queue_num; /* read-only */
};
/* Fields in VIRTIO_PCI_CAP_PCI_CFG: */
#define VIRTIO_PCI_COMMON_Q_USEDHI 52
#define VIRTIO_PCI_COMMON_Q_NDATA 56
#define VIRTIO_PCI_COMMON_Q_RESET 58
+#define VIRTIO_PCI_COMMON_ADM_Q_IDX 60
+#define VIRTIO_PCI_COMMON_ADM_Q_NUM 62
#endif /* VIRTIO_PCI_NO_MODERN */
+/* Admin command status. */
+#define VIRTIO_ADMIN_STATUS_OK 0
+
+/* Admin command opcode. */
+#define VIRTIO_ADMIN_CMD_LIST_QUERY 0x0
+#define VIRTIO_ADMIN_CMD_LIST_USE 0x1
+
+/* Admin command group type. */
+#define VIRTIO_ADMIN_GROUP_TYPE_SRIOV 0x1
+
+/* Transitional device admin command. */
+#define VIRTIO_ADMIN_CMD_LEGACY_COMMON_CFG_WRITE 0x2
+#define VIRTIO_ADMIN_CMD_LEGACY_COMMON_CFG_READ 0x3
+#define VIRTIO_ADMIN_CMD_LEGACY_DEV_CFG_WRITE 0x4
+#define VIRTIO_ADMIN_CMD_LEGACY_DEV_CFG_READ 0x5
+#define VIRTIO_ADMIN_CMD_LEGACY_NOTIFY_INFO 0x6
+
+struct __packed virtio_admin_cmd_hdr {
+ __le16 opcode;
+ /*
+ * 1 - SR-IOV
+ * 2-65535 - reserved
+ */
+ __le16 group_type;
+ /* Unused, reserved for future extensions. */
+ __u8 reserved1[12];
+ __le64 group_member_id;
+};
+
+struct __packed virtio_admin_cmd_status {
+ __le16 status;
+ __le16 status_qualifier;
+ /* Unused, reserved for future extensions. */
+ __u8 reserved2[4];
+};
+
+struct __packed virtio_admin_cmd_legacy_wr_data {
+ __u8 offset; /* Starting offset of the register(s) to write. */
+ __u8 reserved[7];
+ __u8 registers[];
+};
+
+struct __packed virtio_admin_cmd_legacy_rd_data {
+ __u8 offset; /* Starting offset of the register(s) to read. */
+};
+
+#define VIRTIO_ADMIN_CMD_NOTIFY_INFO_FLAGS_END 0
+#define VIRTIO_ADMIN_CMD_NOTIFY_INFO_FLAGS_OWNER_DEV 0x1
+#define VIRTIO_ADMIN_CMD_NOTIFY_INFO_FLAGS_OWNER_MEM 0x2
+
+#define VIRTIO_ADMIN_CMD_MAX_NOTIFY_INFO 4
+
+struct __packed virtio_admin_cmd_notify_info_data {
+ __u8 flags; /* 0 = end of list, 1 = owner device, 2 = member device */
+ __u8 bar; /* BAR of the member or the owner device */
+ __u8 padding[6];
+ __le64 offset; /* Offset within bar. */
+};
+
+struct virtio_admin_cmd_notify_info_result {
+ struct virtio_admin_cmd_notify_info_data entries[VIRTIO_ADMIN_CMD_MAX_NOTIFY_INFO];
+};
+
#endif
projects / linux-2.6-microblaze.git / commitdiff