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vfio/pds: Add VFIO live migration support

Browse source 
Add live migration support via the VFIO subsystem. The migration
implementation aligns with the definition from uapi/vfio.h and uses
the pds_core PF's adminq for device configuration.

The ability to suspend, resume, and transfer VF device state data is
included along with the required admin queue command structures and
implementations.

PDS_LM_CMD_SUSPEND and PDS_LM_CMD_SUSPEND_STATUS are added to support
the VF device suspend operation.

PDS_LM_CMD_RESUME is added to support the VF device resume operation.

PDS_LM_CMD_STATE_SIZE is added to determine the exact size of the VF
device state data.

PDS_LM_CMD_SAVE is added to get the VF device state data.

PDS_LM_CMD_RESTORE is added to restore the VF device with the
previously saved data from PDS_LM_CMD_SAVE.

PDS_LM_CMD_HOST_VF_STATUS is added to notify the DSC/firmware when
a migration is in/not-in progress from the host's perspective. The
DSC/firmware can use this to clear/setup any necessary state related
to a migration.

Signed-off-by: Brett Creeley <brett.creeley@amd.com>
Signed-off-by: Shannon Nelson <shannon.nelson@amd.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20230807205755.29579-6-brett.creeley@amd.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Brett Creeley 2023-08-07 13:57:52 -07:00 committed by Alex Williamson
parent 63f77a7161
commit bb500dbe2a
9 changed files with 1153 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

1
drivers/vfio/pci/pds/Makefile
View file

@ -5,5 +5,6 @@ obj-$(CONFIG_PDS_VFIO_PCI) += pds-vfio-pci.o
pds-vfio-pci-y := \
cmds.o \
lm.o \
pci_drv.o \
vfio_dev.o

330
drivers/vfio/pci/pds/cmds.c
View file

@ -3,6 +3,7 @@
#include <linux/io.h>
#include <linux/types.h>
#include <linux/delay.h>
#include <linux/pds/pds_common.h>
#include <linux/pds/pds_core_if.h>
@ -11,6 +12,37 @@
#include "vfio_dev.h"
#include "cmds.h"
#define SUSPEND_TIMEOUT_S 5
#define SUSPEND_CHECK_INTERVAL_MS 1
static int pds_vfio_client_adminq_cmd(struct pds_vfio_pci_device *pds_vfio,
union pds_core_adminq_cmd *req,
union pds_core_adminq_comp *resp,
bool fast_poll)
{
struct pci_dev *pdev = pds_vfio_to_pci_dev(pds_vfio);
union pds_core_adminq_cmd cmd = {};
struct pdsc *pdsc;
int err;
/* Wrap the client request */
cmd.client_request.opcode = PDS_AQ_CMD_CLIENT_CMD;
cmd.client_request.client_id = cpu_to_le16(pds_vfio->client_id);
memcpy(cmd.client_request.client_cmd, req,
sizeof(cmd.client_request.client_cmd));
pdsc = pdsc_get_pf_struct(pdev);
if (IS_ERR(pdsc))
return PTR_ERR(pdsc);
err = pdsc_adminq_post(pdsc, &cmd, resp, fast_poll);
if (err && err != -EAGAIN)
dev_err(pds_vfio_to_dev(pds_vfio),
"client admin cmd failed: %pe\n", ERR_PTR(err));
return err;
}
int pds_vfio_register_client_cmd(struct pds_vfio_pci_device *pds_vfio)
{
struct pci_dev *pdev = pds_vfio_to_pci_dev(pds_vfio);
@ -52,3 +84,301 @@ void pds_vfio_unregister_client_cmd(struct pds_vfio_pci_device *pds_vfio)
pds_vfio->client_id = 0;
}
static int
pds_vfio_suspend_wait_device_cmd(struct pds_vfio_pci_device *pds_vfio)
{
union pds_core_adminq_cmd cmd = {
.lm_suspend_status = {
.opcode = PDS_LM_CMD_SUSPEND_STATUS,
.vf_id = cpu_to_le16(pds_vfio->vf_id),
},
};
struct device *dev = pds_vfio_to_dev(pds_vfio);
union pds_core_adminq_comp comp = {};
unsigned long time_limit;
unsigned long time_start;
unsigned long time_done;
int err;
time_start = jiffies;
time_limit = time_start + HZ * SUSPEND_TIMEOUT_S;
do {
err = pds_vfio_client_adminq_cmd(pds_vfio, &cmd, &comp, true);
if (err != -EAGAIN)
break;
msleep(SUSPEND_CHECK_INTERVAL_MS);
} while (time_before(jiffies, time_limit));
time_done = jiffies;
dev_dbg(dev, "%s: vf%u: Suspend comp received in %d msecs\n", __func__,
pds_vfio->vf_id, jiffies_to_msecs(time_done - time_start));
/* Check the results */
if (time_after_eq(time_done, time_limit)) {
dev_err(dev, "%s: vf%u: Suspend comp timeout\n", __func__,
pds_vfio->vf_id);
err = -ETIMEDOUT;
}
return err;
}
int pds_vfio_suspend_device_cmd(struct pds_vfio_pci_device *pds_vfio, u8 type)
{
union pds_core_adminq_cmd cmd = {
.lm_suspend = {
.opcode = PDS_LM_CMD_SUSPEND,
.vf_id = cpu_to_le16(pds_vfio->vf_id),
.type = type,
},
};
struct device *dev = pds_vfio_to_dev(pds_vfio);
union pds_core_adminq_comp comp = {};
int err;
dev_dbg(dev, "vf%u: Suspend device\n", pds_vfio->vf_id);
/*
* The initial suspend request to the firmware starts the device suspend
* operation and the firmware returns success if it's started
* successfully.
*/
err = pds_vfio_client_adminq_cmd(pds_vfio, &cmd, &comp, true);
if (err) {
dev_err(dev, "vf%u: Suspend failed: %pe\n", pds_vfio->vf_id,
ERR_PTR(err));
return err;
}
/*
* The subsequent suspend status request(s) check if the firmware has
* completed the device suspend process.
*/
return pds_vfio_suspend_wait_device_cmd(pds_vfio);
}
int pds_vfio_resume_device_cmd(struct pds_vfio_pci_device *pds_vfio, u8 type)
{
union pds_core_adminq_cmd cmd = {
.lm_resume = {
.opcode = PDS_LM_CMD_RESUME,
.vf_id = cpu_to_le16(pds_vfio->vf_id),
.type = type,
},
};
struct device *dev = pds_vfio_to_dev(pds_vfio);
union pds_core_adminq_comp comp = {};
dev_dbg(dev, "vf%u: Resume device\n", pds_vfio->vf_id);
return pds_vfio_client_adminq_cmd(pds_vfio, &cmd, &comp, true);
}
int pds_vfio_get_lm_state_size_cmd(struct pds_vfio_pci_device *pds_vfio, u64 *size)
{
union pds_core_adminq_cmd cmd = {
.lm_state_size = {
.opcode = PDS_LM_CMD_STATE_SIZE,
.vf_id = cpu_to_le16(pds_vfio->vf_id),
},
};
struct device *dev = pds_vfio_to_dev(pds_vfio);
union pds_core_adminq_comp comp = {};
int err;
dev_dbg(dev, "vf%u: Get migration status\n", pds_vfio->vf_id);
err = pds_vfio_client_adminq_cmd(pds_vfio, &cmd, &comp, false);
if (err)
return err;
*size = le64_to_cpu(comp.lm_state_size.size);
return 0;
}
static int pds_vfio_dma_map_lm_file(struct device *dev,
enum dma_data_direction dir,
struct pds_vfio_lm_file *lm_file)
{
struct pds_lm_sg_elem *sgl, *sge;
struct scatterlist *sg;
dma_addr_t sgl_addr;
size_t sgl_size;
int err;
int i;
if (!lm_file)
return -EINVAL;
/* dma map file pages */
err = dma_map_sgtable(dev, &lm_file->sg_table, dir, 0);
if (err)
return err;
lm_file->num_sge = lm_file->sg_table.nents;
/* alloc sgl */
sgl_size = lm_file->num_sge * sizeof(struct pds_lm_sg_elem);
sgl = kzalloc(sgl_size, GFP_KERNEL);
if (!sgl) {
err = -ENOMEM;
goto out_unmap_sgtable;
}
/* fill sgl */
sge = sgl;
for_each_sgtable_dma_sg(&lm_file->sg_table, sg, i) {
sge->addr = cpu_to_le64(sg_dma_address(sg));
sge->len = cpu_to_le32(sg_dma_len(sg));
dev_dbg(dev, "addr = %llx, len = %u\n", sge->addr, sge->len);
sge++;
}
sgl_addr = dma_map_single(dev, sgl, sgl_size, DMA_TO_DEVICE);
if (dma_mapping_error(dev, sgl_addr)) {
err = -EIO;
goto out_free_sgl;
}
lm_file->sgl = sgl;
lm_file->sgl_addr = sgl_addr;
return 0;
out_free_sgl:
kfree(sgl);
out_unmap_sgtable:
lm_file->num_sge = 0;
dma_unmap_sgtable(dev, &lm_file->sg_table, dir, 0);
return err;
}
static void pds_vfio_dma_unmap_lm_file(struct device *dev,
enum dma_data_direction dir,
struct pds_vfio_lm_file *lm_file)
{
if (!lm_file)
return;
/* free sgl */
if (lm_file->sgl) {
dma_unmap_single(dev, lm_file->sgl_addr,
lm_file->num_sge * sizeof(*lm_file->sgl),
DMA_TO_DEVICE);
kfree(lm_file->sgl);
lm_file->sgl = NULL;
lm_file->sgl_addr = DMA_MAPPING_ERROR;
lm_file->num_sge = 0;
}
/* dma unmap file pages */
dma_unmap_sgtable(dev, &lm_file->sg_table, dir, 0);
}
int pds_vfio_get_lm_state_cmd(struct pds_vfio_pci_device *pds_vfio)
{
union pds_core_adminq_cmd cmd = {
.lm_save = {
.opcode = PDS_LM_CMD_SAVE,
.vf_id = cpu_to_le16(pds_vfio->vf_id),
},
};
struct pci_dev *pdev = pds_vfio_to_pci_dev(pds_vfio);
struct device *pdsc_dev = &pci_physfn(pdev)->dev;
union pds_core_adminq_comp comp = {};
struct pds_vfio_lm_file *lm_file;
int err;
dev_dbg(&pdev->dev, "vf%u: Get migration state\n", pds_vfio->vf_id);
lm_file = pds_vfio->save_file;
err = pds_vfio_dma_map_lm_file(pdsc_dev, DMA_FROM_DEVICE, lm_file);
if (err) {
dev_err(&pdev->dev, "failed to map save migration file: %pe\n",
ERR_PTR(err));
return err;
}
cmd.lm_save.sgl_addr = cpu_to_le64(lm_file->sgl_addr);
cmd.lm_save.num_sge = cpu_to_le32(lm_file->num_sge);
err = pds_vfio_client_adminq_cmd(pds_vfio, &cmd, &comp, false);
if (err)
dev_err(&pdev->dev, "failed to get migration state: %pe\n",
ERR_PTR(err));
pds_vfio_dma_unmap_lm_file(pdsc_dev, DMA_FROM_DEVICE, lm_file);
return err;
}
int pds_vfio_set_lm_state_cmd(struct pds_vfio_pci_device *pds_vfio)
{
union pds_core_adminq_cmd cmd = {
.lm_restore = {
.opcode = PDS_LM_CMD_RESTORE,
.vf_id = cpu_to_le16(pds_vfio->vf_id),
},
};
struct pci_dev *pdev = pds_vfio_to_pci_dev(pds_vfio);
struct device *pdsc_dev = &pci_physfn(pdev)->dev;
union pds_core_adminq_comp comp = {};
struct pds_vfio_lm_file *lm_file;
int err;
dev_dbg(&pdev->dev, "vf%u: Set migration state\n", pds_vfio->vf_id);
lm_file = pds_vfio->restore_file;
err = pds_vfio_dma_map_lm_file(pdsc_dev, DMA_TO_DEVICE, lm_file);
if (err) {
dev_err(&pdev->dev,
"failed to map restore migration file: %pe\n",
ERR_PTR(err));
return err;
}
cmd.lm_restore.sgl_addr = cpu_to_le64(lm_file->sgl_addr);
cmd.lm_restore.num_sge = cpu_to_le32(lm_file->num_sge);
err = pds_vfio_client_adminq_cmd(pds_vfio, &cmd, &comp, false);
if (err)
dev_err(&pdev->dev, "failed to set migration state: %pe\n",
ERR_PTR(err));
pds_vfio_dma_unmap_lm_file(pdsc_dev, DMA_TO_DEVICE, lm_file);
return err;
}
void pds_vfio_send_host_vf_lm_status_cmd(struct pds_vfio_pci_device *pds_vfio,
enum pds_lm_host_vf_status vf_status)
{
union pds_core_adminq_cmd cmd = {
.lm_host_vf_status = {
.opcode = PDS_LM_CMD_HOST_VF_STATUS,
.vf_id = cpu_to_le16(pds_vfio->vf_id),
.status = vf_status,
},
};
struct device *dev = pds_vfio_to_dev(pds_vfio);
union pds_core_adminq_comp comp = {};
int err;
dev_dbg(dev, "vf%u: Set host VF LM status: %u", pds_vfio->vf_id,
vf_status);
if (vf_status != PDS_LM_STA_IN_PROGRESS &&
vf_status != PDS_LM_STA_NONE) {
dev_warn(dev, "Invalid host VF migration status, %d\n",
vf_status);
return;
}
err = pds_vfio_client_adminq_cmd(pds_vfio, &cmd, &comp, false);
if (err)
dev_warn(dev, "failed to send host VF migration status: %pe\n",
ERR_PTR(err));
}

8
drivers/vfio/pci/pds/cmds.h
View file

@ -6,5 +6,11 @@
int pds_vfio_register_client_cmd(struct pds_vfio_pci_device *pds_vfio);
void pds_vfio_unregister_client_cmd(struct pds_vfio_pci_device *pds_vfio);
int pds_vfio_suspend_device_cmd(struct pds_vfio_pci_device *pds_vfio, u8 type);
int pds_vfio_resume_device_cmd(struct pds_vfio_pci_device *pds_vfio, u8 type);
int pds_vfio_get_lm_state_size_cmd(struct pds_vfio_pci_device *pds_vfio, u64 *size);
int pds_vfio_get_lm_state_cmd(struct pds_vfio_pci_device *pds_vfio);
int pds_vfio_set_lm_state_cmd(struct pds_vfio_pci_device *pds_vfio);
void pds_vfio_send_host_vf_lm_status_cmd(struct pds_vfio_pci_device *pds_vfio,
enum pds_lm_host_vf_status vf_status);
#endif /* _CMDS_H_ */

434
drivers/vfio/pci/pds/lm.c Normal file
View file

@ -0,0 +1,434 @@
// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 2023 Advanced Micro Devices, Inc. */
#include <linux/anon_inodes.h>
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/highmem.h>
#include <linux/vfio.h>
#include <linux/vfio_pci_core.h>
#include "vfio_dev.h"
#include "cmds.h"
static struct pds_vfio_lm_file *
pds_vfio_get_lm_file(const struct file_operations *fops, int flags, u64 size)
{
struct pds_vfio_lm_file *lm_file = NULL;
unsigned long long npages;
struct page **pages;
void *page_mem;
const void *p;
if (!size)
return NULL;
/* Alloc file structure */
lm_file = kzalloc(sizeof(*lm_file), GFP_KERNEL);
if (!lm_file)
return NULL;
/* Create file */
lm_file->filep =
anon_inode_getfile("pds_vfio_lm", fops, lm_file, flags);
if (!lm_file->filep)
goto out_free_file;
stream_open(lm_file->filep->f_inode, lm_file->filep);
mutex_init(&lm_file->lock);
/* prevent file from being released before we are done with it */
get_file(lm_file->filep);
/* Allocate memory for file pages */
npages = DIV_ROUND_UP_ULL(size, PAGE_SIZE);
pages = kmalloc_array(npages, sizeof(*pages), GFP_KERNEL);
if (!pages)
goto out_put_file;
page_mem = kvzalloc(ALIGN(size, PAGE_SIZE), GFP_KERNEL);
if (!page_mem)
goto out_free_pages_array;
p = page_mem - offset_in_page(page_mem);
for (unsigned long long i = 0; i < npages; i++) {
if (is_vmalloc_addr(p))
pages[i] = vmalloc_to_page(p);
else
pages[i] = kmap_to_page((void *)p);
if (!pages[i])
goto out_free_page_mem;
p += PAGE_SIZE;
}
/* Create scatterlist of file pages to use for DMA mapping later */
if (sg_alloc_table_from_pages(&lm_file->sg_table, pages, npages, 0,
size, GFP_KERNEL))
goto out_free_page_mem;
lm_file->size = size;
lm_file->pages = pages;
lm_file->npages = npages;
lm_file->page_mem = page_mem;
lm_file->alloc_size = npages * PAGE_SIZE;
return lm_file;
out_free_page_mem:
kvfree(page_mem);
out_free_pages_array:
kfree(pages);
out_put_file:
fput(lm_file->filep);
mutex_destroy(&lm_file->lock);
out_free_file:
kfree(lm_file);
return NULL;
}
static void pds_vfio_put_lm_file(struct pds_vfio_lm_file *lm_file)
{
mutex_lock(&lm_file->lock);
lm_file->size = 0;
lm_file->alloc_size = 0;
/* Free scatter list of file pages */
sg_free_table(&lm_file->sg_table);
kvfree(lm_file->page_mem);
lm_file->page_mem = NULL;
kfree(lm_file->pages);
lm_file->pages = NULL;
mutex_unlock(&lm_file->lock);
/* allow file to be released since we are done with it */
fput(lm_file->filep);
}
void pds_vfio_put_save_file(struct pds_vfio_pci_device *pds_vfio)
{
if (!pds_vfio->save_file)
return;
pds_vfio_put_lm_file(pds_vfio->save_file);
pds_vfio->save_file = NULL;
}
void pds_vfio_put_restore_file(struct pds_vfio_pci_device *pds_vfio)
{
if (!pds_vfio->restore_file)
return;
pds_vfio_put_lm_file(pds_vfio->restore_file);
pds_vfio->restore_file = NULL;
}
static struct page *pds_vfio_get_file_page(struct pds_vfio_lm_file *lm_file,
unsigned long offset)
{
unsigned long cur_offset = 0;
struct scatterlist *sg;
unsigned int i;
/* All accesses are sequential */
if (offset < lm_file->last_offset || !lm_file->last_offset_sg) {
lm_file->last_offset = 0;
lm_file->last_offset_sg = lm_file->sg_table.sgl;
lm_file->sg_last_entry = 0;
}
cur_offset = lm_file->last_offset;
for_each_sg(lm_file->last_offset_sg, sg,
lm_file->sg_table.orig_nents - lm_file->sg_last_entry, i) {
if (offset < sg->length + cur_offset) {
lm_file->last_offset_sg = sg;
lm_file->sg_last_entry += i;
lm_file->last_offset = cur_offset;
return nth_page(sg_page(sg),
(offset - cur_offset) / PAGE_SIZE);
}
cur_offset += sg->length;
}
return NULL;
}
static int pds_vfio_release_file(struct inode *inode, struct file *filp)
{
struct pds_vfio_lm_file *lm_file = filp->private_data;
mutex_lock(&lm_file->lock);
lm_file->filep->f_pos = 0;
lm_file->size = 0;
mutex_unlock(&lm_file->lock);
mutex_destroy(&lm_file->lock);
kfree(lm_file);
return 0;
}
static ssize_t pds_vfio_save_read(struct file *filp, char __user *buf,
size_t len, loff_t *pos)
{
struct pds_vfio_lm_file *lm_file = filp->private_data;
ssize_t done = 0;
if (pos)
return -ESPIPE;
pos = &filp->f_pos;
mutex_lock(&lm_file->lock);
if (*pos > lm_file->size) {
done = -EINVAL;
goto out_unlock;
}
len = min_t(size_t, lm_file->size - *pos, len);
while (len) {
size_t page_offset;
struct page *page;
size_t page_len;
u8 *from_buff;
int err;
page_offset = (*pos) % PAGE_SIZE;
page = pds_vfio_get_file_page(lm_file, *pos - page_offset);
if (!page) {
if (done == 0)
done = -EINVAL;
goto out_unlock;
}
page_len = min_t(size_t, len, PAGE_SIZE - page_offset);
from_buff = kmap_local_page(page);
err = copy_to_user(buf, from_buff + page_offset, page_len);
kunmap_local(from_buff);
if (err) {
done = -EFAULT;
goto out_unlock;
}
*pos += page_len;
len -= page_len;
done += page_len;
buf += page_len;
}
out_unlock:
mutex_unlock(&lm_file->lock);
return done;
}
static const struct file_operations pds_vfio_save_fops = {
.owner = THIS_MODULE,
.read = pds_vfio_save_read,
.release = pds_vfio_release_file,
.llseek = no_llseek,
};
static int pds_vfio_get_save_file(struct pds_vfio_pci_device *pds_vfio)
{
struct device *dev = &pds_vfio->vfio_coredev.pdev->dev;
struct pds_vfio_lm_file *lm_file;
u64 size;
int err;
/* Get live migration state size in this state */
err = pds_vfio_get_lm_state_size_cmd(pds_vfio, &size);
if (err) {
dev_err(dev, "failed to get save status: %pe\n", ERR_PTR(err));
return err;
}
dev_dbg(dev, "save status, size = %lld\n", size);
if (!size) {
dev_err(dev, "invalid state size\n");
return -EIO;
}
lm_file = pds_vfio_get_lm_file(&pds_vfio_save_fops, O_RDONLY, size);
if (!lm_file) {
dev_err(dev, "failed to create save file\n");
return -ENOENT;
}
dev_dbg(dev, "size = %lld, alloc_size = %lld, npages = %lld\n",
lm_file->size, lm_file->alloc_size, lm_file->npages);
pds_vfio->save_file = lm_file;
return 0;
}
static ssize_t pds_vfio_restore_write(struct file *filp, const char __user *buf,
size_t len, loff_t *pos)
{
struct pds_vfio_lm_file *lm_file = filp->private_data;
loff_t requested_length;
ssize_t done = 0;
if (pos)
return -ESPIPE;
pos = &filp->f_pos;
if (*pos < 0 ||
check_add_overflow((loff_t)len, *pos, &requested_length))
return -EINVAL;
mutex_lock(&lm_file->lock);
while (len) {
size_t page_offset;
struct page *page;
size_t page_len;
u8 *to_buff;
int err;
page_offset = (*pos) % PAGE_SIZE;
page = pds_vfio_get_file_page(lm_file, *pos - page_offset);
if (!page) {
if (done == 0)
done = -EINVAL;
goto out_unlock;
}
page_len = min_t(size_t, len, PAGE_SIZE - page_offset);
to_buff = kmap_local_page(page);
err = copy_from_user(to_buff + page_offset, buf, page_len);
kunmap_local(to_buff);
if (err) {
done = -EFAULT;
goto out_unlock;
}
*pos += page_len;
len -= page_len;
done += page_len;
buf += page_len;
lm_file->size += page_len;
}
out_unlock:
mutex_unlock(&lm_file->lock);
return done;
}
static const struct file_operations pds_vfio_restore_fops = {
.owner = THIS_MODULE,
.write = pds_vfio_restore_write,
.release = pds_vfio_release_file,
.llseek = no_llseek,
};
static int pds_vfio_get_restore_file(struct pds_vfio_pci_device *pds_vfio)
{
struct device *dev = &pds_vfio->vfio_coredev.pdev->dev;
struct pds_vfio_lm_file *lm_file;
u64 size;
size = sizeof(union pds_lm_dev_state);
dev_dbg(dev, "restore status, size = %lld\n", size);
if (!size) {
dev_err(dev, "invalid state size");
return -EIO;
}
lm_file = pds_vfio_get_lm_file(&pds_vfio_restore_fops, O_WRONLY, size);
if (!lm_file) {
dev_err(dev, "failed to create restore file");
return -ENOENT;
}
pds_vfio->restore_file = lm_file;
return 0;
}
struct file *
pds_vfio_step_device_state_locked(struct pds_vfio_pci_device *pds_vfio,
enum vfio_device_mig_state next)
{
enum vfio_device_mig_state cur = pds_vfio->state;
int err;
if (cur == VFIO_DEVICE_STATE_STOP && next == VFIO_DEVICE_STATE_STOP_COPY) {
err = pds_vfio_get_save_file(pds_vfio);
if (err)
return ERR_PTR(err);
err = pds_vfio_get_lm_state_cmd(pds_vfio);
if (err) {
pds_vfio_put_save_file(pds_vfio);
return ERR_PTR(err);
}
return pds_vfio->save_file->filep;
}
if (cur == VFIO_DEVICE_STATE_STOP_COPY && next == VFIO_DEVICE_STATE_STOP) {
pds_vfio_put_save_file(pds_vfio);
pds_vfio_send_host_vf_lm_status_cmd(pds_vfio, PDS_LM_STA_NONE);
return NULL;
}
if (cur == VFIO_DEVICE_STATE_STOP && next == VFIO_DEVICE_STATE_RESUMING) {
err = pds_vfio_get_restore_file(pds_vfio);
if (err)
return ERR_PTR(err);
return pds_vfio->restore_file->filep;
}
if (cur == VFIO_DEVICE_STATE_RESUMING && next == VFIO_DEVICE_STATE_STOP) {
err = pds_vfio_set_lm_state_cmd(pds_vfio);
if (err)
return ERR_PTR(err);
pds_vfio_put_restore_file(pds_vfio);
return NULL;
}
if (cur == VFIO_DEVICE_STATE_RUNNING && next == VFIO_DEVICE_STATE_RUNNING_P2P) {
pds_vfio_send_host_vf_lm_status_cmd(pds_vfio,
PDS_LM_STA_IN_PROGRESS);
err = pds_vfio_suspend_device_cmd(pds_vfio,
PDS_LM_SUSPEND_RESUME_TYPE_P2P);
if (err)
return ERR_PTR(err);
return NULL;
}
if (cur == VFIO_DEVICE_STATE_RUNNING_P2P && next == VFIO_DEVICE_STATE_RUNNING) {
err = pds_vfio_resume_device_cmd(pds_vfio,
PDS_LM_SUSPEND_RESUME_TYPE_FULL);
if (err)
return ERR_PTR(err);
pds_vfio_send_host_vf_lm_status_cmd(pds_vfio, PDS_LM_STA_NONE);
return NULL;
}
if (cur == VFIO_DEVICE_STATE_STOP && next == VFIO_DEVICE_STATE_RUNNING_P2P) {
err = pds_vfio_resume_device_cmd(pds_vfio,
PDS_LM_SUSPEND_RESUME_TYPE_P2P);
if (err)
return ERR_PTR(err);
return NULL;
}
if (cur == VFIO_DEVICE_STATE_RUNNING_P2P && next == VFIO_DEVICE_STATE_STOP) {
err = pds_vfio_suspend_device_cmd(pds_vfio,
PDS_LM_SUSPEND_RESUME_TYPE_FULL);
if (err)
return ERR_PTR(err);
return NULL;
}
return ERR_PTR(-EINVAL);
}

41
drivers/vfio/pci/pds/lm.h Normal file
View file

@ -0,0 +1,41 @@
/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright(c) 2023 Advanced Micro Devices, Inc. */
#ifndef _LM_H_
#define _LM_H_
#include <linux/fs.h>
#include <linux/mutex.h>
#include <linux/scatterlist.h>
#include <linux/types.h>
#include <linux/pds/pds_common.h>
#include <linux/pds/pds_adminq.h>
struct pds_vfio_lm_file {
struct file *filep;
struct mutex lock; /* protect live migration data file */
u64 size; /* Size with valid data */
u64 alloc_size; /* Total allocated size. Always >= len */
void *page_mem; /* memory allocated for pages */
struct page **pages; /* Backing pages for file */
unsigned long long npages;
struct sg_table sg_table; /* SG table for backing pages */
struct pds_lm_sg_elem *sgl; /* DMA mapping */
dma_addr_t sgl_addr;
u16 num_sge;
struct scatterlist *last_offset_sg; /* Iterator */
unsigned int sg_last_entry;
unsigned long last_offset;
};
struct pds_vfio_pci_device;
struct file *
pds_vfio_step_device_state_locked(struct pds_vfio_pci_device *pds_vfio,
enum vfio_device_mig_state next);
void pds_vfio_put_save_file(struct pds_vfio_pci_device *pds_vfio);
void pds_vfio_put_restore_file(struct pds_vfio_pci_device *pds_vfio);
#endif /* _LM_H_ */

13
drivers/vfio/pci/pds/pci_drv.c
View file

@ -67,11 +67,24 @@ static const struct pci_device_id pds_vfio_pci_table[] = {
};
MODULE_DEVICE_TABLE(pci, pds_vfio_pci_table);
static void pds_vfio_pci_aer_reset_done(struct pci_dev *pdev)
{
struct pds_vfio_pci_device *pds_vfio = pds_vfio_pci_drvdata(pdev);
pds_vfio_reset(pds_vfio);
}
static const struct pci_error_handlers pds_vfio_pci_err_handlers = {
.reset_done = pds_vfio_pci_aer_reset_done,
.error_detected = vfio_pci_core_aer_err_detected,
};
static struct pci_driver pds_vfio_pci_driver = {
.name = KBUILD_MODNAME,
.id_table = pds_vfio_pci_table,
.probe = pds_vfio_pci_probe,
.remove = pds_vfio_pci_remove,
.err_handler = &pds_vfio_pci_err_handlers,
.driver_managed_dma = true,
};

120
drivers/vfio/pci/pds/vfio_dev.c
View file

@ -4,6 +4,7 @@
#include <linux/vfio.h>
#include <linux/vfio_pci_core.h>
#include "lm.h"
#include "vfio_dev.h"
struct pci_dev *pds_vfio_to_pci_dev(struct pds_vfio_pci_device *pds_vfio)
@ -11,6 +12,11 @@ struct pci_dev *pds_vfio_to_pci_dev(struct pds_vfio_pci_device *pds_vfio)
return pds_vfio->vfio_coredev.pdev;
}
struct device *pds_vfio_to_dev(struct pds_vfio_pci_device *pds_vfio)
{
return &pds_vfio_to_pci_dev(pds_vfio)->dev;
}
struct pds_vfio_pci_device *pds_vfio_pci_drvdata(struct pci_dev *pdev)
{
struct vfio_pci_core_device *core_device = dev_get_drvdata(&pdev->dev);
@ -19,6 +25,98 @@ struct pds_vfio_pci_device *pds_vfio_pci_drvdata(struct pci_dev *pdev)
vfio_coredev);
}
static void pds_vfio_state_mutex_unlock(struct pds_vfio_pci_device *pds_vfio)
{
again:
spin_lock(&pds_vfio->reset_lock);
if (pds_vfio->deferred_reset) {
pds_vfio->deferred_reset = false;
if (pds_vfio->state == VFIO_DEVICE_STATE_ERROR) {
pds_vfio->state = VFIO_DEVICE_STATE_RUNNING;
pds_vfio_put_restore_file(pds_vfio);
pds_vfio_put_save_file(pds_vfio);
}
spin_unlock(&pds_vfio->reset_lock);
goto again;
}
mutex_unlock(&pds_vfio->state_mutex);
spin_unlock(&pds_vfio->reset_lock);
}
void pds_vfio_reset(struct pds_vfio_pci_device *pds_vfio)
{
spin_lock(&pds_vfio->reset_lock);
pds_vfio->deferred_reset = true;
if (!mutex_trylock(&pds_vfio->state_mutex)) {
spin_unlock(&pds_vfio->reset_lock);
return;
}
spin_unlock(&pds_vfio->reset_lock);
pds_vfio_state_mutex_unlock(pds_vfio);
}
static struct file *
pds_vfio_set_device_state(struct vfio_device *vdev,
enum vfio_device_mig_state new_state)
{
struct pds_vfio_pci_device *pds_vfio =
container_of(vdev, struct pds_vfio_pci_device,
vfio_coredev.vdev);
struct file *res = NULL;
mutex_lock(&pds_vfio->state_mutex);
while (new_state != pds_vfio->state) {
enum vfio_device_mig_state next_state;
int err = vfio_mig_get_next_state(vdev, pds_vfio->state,
new_state, &next_state);
if (err) {
res = ERR_PTR(err);
break;
}
res = pds_vfio_step_device_state_locked(pds_vfio, next_state);
if (IS_ERR(res))
break;
pds_vfio->state = next_state;
if (WARN_ON(res && new_state != pds_vfio->state)) {
res = ERR_PTR(-EINVAL);
break;
}
}
pds_vfio_state_mutex_unlock(pds_vfio);
return res;
}
static int pds_vfio_get_device_state(struct vfio_device *vdev,
enum vfio_device_mig_state *current_state)
{
struct pds_vfio_pci_device *pds_vfio =
container_of(vdev, struct pds_vfio_pci_device,
vfio_coredev.vdev);
mutex_lock(&pds_vfio->state_mutex);
*current_state = pds_vfio->state;
pds_vfio_state_mutex_unlock(pds_vfio);
return 0;
}
static int pds_vfio_get_device_state_size(struct vfio_device *vdev,
unsigned long *stop_copy_length)
{
*stop_copy_length = PDS_LM_DEVICE_STATE_LENGTH;
return 0;
}
static const struct vfio_migration_ops pds_vfio_lm_ops = {
.migration_set_state = pds_vfio_set_device_state,
.migration_get_state = pds_vfio_get_device_state,
.migration_get_data_size = pds_vfio_get_device_state_size
};
static int pds_vfio_init_device(struct vfio_device *vdev)
{
struct pds_vfio_pci_device *pds_vfio =
@ -37,6 +135,9 @@ static int pds_vfio_init_device(struct vfio_device *vdev)
pds_vfio->vf_id = vf_id;
vdev->migration_flags = VFIO_MIGRATION_STOP_COPY | VFIO_MIGRATION_P2P;
vdev->mig_ops = &pds_vfio_lm_ops;
pci_id = PCI_DEVID(pdev->bus->number, pdev->devfn);
dev_dbg(&pdev->dev,
"%s: PF %#04x VF %#04x vf_id %d domain %d pds_vfio %p\n",
@ -57,17 +158,34 @@ static int pds_vfio_open_device(struct vfio_device *vdev)
if (err)
return err;
mutex_init(&pds_vfio->state_mutex);
pds_vfio->state = VFIO_DEVICE_STATE_RUNNING;
vfio_pci_core_finish_enable(&pds_vfio->vfio_coredev);
return 0;
}
static void pds_vfio_close_device(struct vfio_device *vdev)
{
struct pds_vfio_pci_device *pds_vfio =
container_of(vdev, struct pds_vfio_pci_device,
vfio_coredev.vdev);
mutex_lock(&pds_vfio->state_mutex);
pds_vfio_put_restore_file(pds_vfio);
pds_vfio_put_save_file(pds_vfio);
mutex_unlock(&pds_vfio->state_mutex);
mutex_destroy(&pds_vfio->state_mutex);
vfio_pci_core_close_device(vdev);
}
static const struct vfio_device_ops pds_vfio_ops = {
.name = "pds-vfio",
.init = pds_vfio_init_device,
.release = vfio_pci_core_release_dev,
.open_device = pds_vfio_open_device,
.close_device = vfio_pci_core_close_device,
.close_device = pds_vfio_close_device,
.ioctl = vfio_pci_core_ioctl,
.device_feature = vfio_pci_core_ioctl_feature,
.read = vfio_pci_core_read,

11
drivers/vfio/pci/pds/vfio_dev.h
View file

@ -7,16 +7,27 @@
#include <linux/pci.h>
#include <linux/vfio_pci_core.h>
#include "lm.h"
struct pds_vfio_pci_device {
struct vfio_pci_core_device vfio_coredev;
struct pds_vfio_lm_file *save_file;
struct pds_vfio_lm_file *restore_file;
struct mutex state_mutex; /* protect migration state */
enum vfio_device_mig_state state;
spinlock_t reset_lock; /* protect reset_done flow */
u8 deferred_reset;
int vf_id;
u16 client_id;
};
const struct vfio_device_ops *pds_vfio_ops_info(void);
struct pds_vfio_pci_device *pds_vfio_pci_drvdata(struct pci_dev *pdev);
void pds_vfio_reset(struct pds_vfio_pci_device *pds_vfio);
struct pci_dev *pds_vfio_to_pci_dev(struct pds_vfio_pci_device *pds_vfio);
struct device *pds_vfio_to_dev(struct pds_vfio_pci_device *pds_vfio);
#endif /* _VFIO_DEV_H_ */

197
include/linux/pds/pds_adminq.h
View file

@ -818,6 +818,194 @@ struct pds_vdpa_set_features_cmd {
__le64 features;
};
#define PDS_LM_DEVICE_STATE_LENGTH 65536
#define PDS_LM_CHECK_DEVICE_STATE_LENGTH(X) \
PDS_CORE_SIZE_CHECK(union, PDS_LM_DEVICE_STATE_LENGTH, X)
/*
* enum pds_lm_cmd_opcode - Live Migration Device commands
*/
enum pds_lm_cmd_opcode {
PDS_LM_CMD_HOST_VF_STATUS = 1,
/* Device state commands */
PDS_LM_CMD_STATE_SIZE = 16,
PDS_LM_CMD_SUSPEND = 18,
PDS_LM_CMD_SUSPEND_STATUS = 19,
PDS_LM_CMD_RESUME = 20,
PDS_LM_CMD_SAVE = 21,
PDS_LM_CMD_RESTORE = 22,
};
/**
* struct pds_lm_cmd - generic command
* @opcode: Opcode
* @rsvd: Word boundary padding
* @vf_id: VF id
* @rsvd2: Structure padding to 60 Bytes
*/
struct pds_lm_cmd {
u8 opcode;
u8 rsvd;
__le16 vf_id;
u8 rsvd2[56];
};
/**
* struct pds_lm_state_size_cmd - STATE_SIZE command
* @opcode: Opcode
* @rsvd: Word boundary padding
* @vf_id: VF id
*/
struct pds_lm_state_size_cmd {
u8 opcode;
u8 rsvd;
__le16 vf_id;
};
/**
* struct pds_lm_state_size_comp - STATE_SIZE command completion
* @status: Status of the command (enum pds_core_status_code)
* @rsvd: Word boundary padding
* @comp_index: Index in the desc ring for which this is the completion
* @size: Size of the device state
* @rsvd2: Word boundary padding
* @color: Color bit
*/
struct pds_lm_state_size_comp {
u8 status;
u8 rsvd;
__le16 comp_index;
union {
__le64 size;
u8 rsvd2[11];
} __packed;
u8 color;
};
enum pds_lm_suspend_resume_type {
PDS_LM_SUSPEND_RESUME_TYPE_FULL = 0,
PDS_LM_SUSPEND_RESUME_TYPE_P2P = 1,
};
/**
* struct pds_lm_suspend_cmd - SUSPEND command
* @opcode: Opcode PDS_LM_CMD_SUSPEND
* @rsvd: Word boundary padding
* @vf_id: VF id
* @type: Type of suspend (enum pds_lm_suspend_resume_type)
*/
struct pds_lm_suspend_cmd {
u8 opcode;
u8 rsvd;
__le16 vf_id;
u8 type;
};
/**
* struct pds_lm_suspend_status_cmd - SUSPEND status command
* @opcode: Opcode PDS_AQ_CMD_LM_SUSPEND_STATUS
* @rsvd: Word boundary padding
* @vf_id: VF id
* @type: Type of suspend (enum pds_lm_suspend_resume_type)
*/
struct pds_lm_suspend_status_cmd {
u8 opcode;
u8 rsvd;
__le16 vf_id;
u8 type;
};
/**
* struct pds_lm_resume_cmd - RESUME command
* @opcode: Opcode PDS_LM_CMD_RESUME
* @rsvd: Word boundary padding
* @vf_id: VF id
* @type: Type of resume (enum pds_lm_suspend_resume_type)
*/
struct pds_lm_resume_cmd {
u8 opcode;
u8 rsvd;
__le16 vf_id;
u8 type;
};
/**
* struct pds_lm_sg_elem - Transmit scatter-gather (SG) descriptor element
* @addr: DMA address of SG element data buffer
* @len: Length of SG element data buffer, in bytes
* @rsvd: Word boundary padding
*/
struct pds_lm_sg_elem {
__le64 addr;
__le32 len;
__le16 rsvd[2];
};
/**
* struct pds_lm_save_cmd - SAVE command
* @opcode: Opcode PDS_LM_CMD_SAVE
* @rsvd: Word boundary padding
* @vf_id: VF id
* @rsvd2: Word boundary padding
* @sgl_addr: IOVA address of the SGL to dma the device state
* @num_sge: Total number of SG elements
*/
struct pds_lm_save_cmd {
u8 opcode;
u8 rsvd;
__le16 vf_id;
u8 rsvd2[4];
__le64 sgl_addr;
__le32 num_sge;
} __packed;
/**
* struct pds_lm_restore_cmd - RESTORE command
* @opcode: Opcode PDS_LM_CMD_RESTORE
* @rsvd: Word boundary padding
* @vf_id: VF id
* @rsvd2: Word boundary padding
* @sgl_addr: IOVA address of the SGL to dma the device state
* @num_sge: Total number of SG elements
*/
struct pds_lm_restore_cmd {
u8 opcode;
u8 rsvd;
__le16 vf_id;
u8 rsvd2[4];
__le64 sgl_addr;
__le32 num_sge;
} __packed;
/**
* union pds_lm_dev_state - device state information
* @words: Device state words
*/
union pds_lm_dev_state {
__le32 words[PDS_LM_DEVICE_STATE_LENGTH / sizeof(__le32)];
};
enum pds_lm_host_vf_status {
PDS_LM_STA_NONE = 0,
PDS_LM_STA_IN_PROGRESS,
PDS_LM_STA_MAX,
};
/**
* struct pds_lm_host_vf_status_cmd - HOST_VF_STATUS command
* @opcode: Opcode PDS_LM_CMD_HOST_VF_STATUS
* @rsvd: Word boundary padding
* @vf_id: VF id
* @status: Current LM status of host VF driver (enum pds_lm_host_status)
*/
struct pds_lm_host_vf_status_cmd {
u8 opcode;
u8 rsvd;
__le16 vf_id;
u8 status;
};
union pds_core_adminq_cmd {
u8 opcode;
u8 bytes[64];
@ -844,6 +1032,13 @@ union pds_core_adminq_cmd {
struct pds_vdpa_vq_init_cmd vdpa_vq_init;
struct pds_vdpa_vq_reset_cmd vdpa_vq_reset;
struct pds_lm_suspend_cmd lm_suspend;
struct pds_lm_suspend_status_cmd lm_suspend_status;
struct pds_lm_resume_cmd lm_resume;
struct pds_lm_state_size_cmd lm_state_size;
struct pds_lm_save_cmd lm_save;
struct pds_lm_restore_cmd lm_restore;
struct pds_lm_host_vf_status_cmd lm_host_vf_status;
};
union pds_core_adminq_comp {
@ -868,6 +1063,8 @@ union pds_core_adminq_comp {
struct pds_vdpa_vq_init_comp vdpa_vq_init;
struct pds_vdpa_vq_reset_comp vdpa_vq_reset;
struct pds_lm_state_size_comp lm_state_size;
};
#ifndef __CHECKER__