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Message-ID: <8fd5b0b7-abd0-88f3-3acb-b3ed9c8917c6@amd.com>
Date: Thu, 15 Jun 2023 14:36:59 -0700
From: Brett Creeley <bcreeley@....com>
To: Shameerali Kolothum Thodi <shameerali.kolothum.thodi@...wei.com>,
Brett Creeley <brett.creeley@....com>,
"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"alex.williamson@...hat.com" <alex.williamson@...hat.com>,
"jgg@...dia.com" <jgg@...dia.com>, "yishaih@...dia.com"
<yishaih@...dia.com>, "kevin.tian@...el.com" <kevin.tian@...el.com>
Cc: "shannon.nelson@....com" <shannon.nelson@....com>
Subject: Re: [PATCH v10 vfio 4/7] vfio/pds: Add VFIO live migration support
On 6/15/2023 2:07 PM, Shameerali Kolothum Thodi wrote:
> Caution: This message originated from an External Source. Use proper caution when opening attachments, clicking links, or responding.
>
>
>> -----Original Message-----
>> From: Brett Creeley [mailto:brett.creeley@....com]
>> Sent: 02 June 2023 23:03
>> To: kvm@...r.kernel.org; netdev@...r.kernel.org;
>> alex.williamson@...hat.com; jgg@...dia.com; yishaih@...dia.com;
>> Shameerali Kolothum Thodi <shameerali.kolothum.thodi@...wei.com>;
>> kevin.tian@...el.com
>> Cc: brett.creeley@....com; shannon.nelson@....com
>> Subject: [PATCH v10 vfio 4/7] vfio/pds: Add VFIO live migration support
>>
>> 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_STATUS 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 device when
>> a migration is in/not-in progress from the host's perspective.
>>
>> Signed-off-by: Brett Creeley <brett.creeley@....com>
>> Signed-off-by: Shannon Nelson <shannon.nelson@....com>
>> ---
>> drivers/vfio/pci/pds/Makefile | 1 +
>> drivers/vfio/pci/pds/cmds.c | 319 ++++++++++++++++++++++++
>> drivers/vfio/pci/pds/cmds.h | 8 +-
>> drivers/vfio/pci/pds/lm.c | 421
>> ++++++++++++++++++++++++++++++++
>> drivers/vfio/pci/pds/lm.h | 41 ++++
>> drivers/vfio/pci/pds/pci_drv.c | 13 +
>> drivers/vfio/pci/pds/vfio_dev.c | 120 ++++++++-
>> drivers/vfio/pci/pds/vfio_dev.h | 11 +
>> include/linux/pds/pds_adminq.h | 217 ++++++++++++++++
>> 9 files changed, 1149 insertions(+), 2 deletions(-)
>> create mode 100644 drivers/vfio/pci/pds/lm.c
>> create mode 100644 drivers/vfio/pci/pds/lm.h
>>
>> diff --git a/drivers/vfio/pci/pds/Makefile b/drivers/vfio/pci/pds/Makefile
>> index 87581111fa17..dbaf613d3794 100644
>> --- a/drivers/vfio/pci/pds/Makefile
>> +++ b/drivers/vfio/pci/pds/Makefile
>> @@ -5,5 +5,6 @@ obj-$(CONFIG_PDS_VFIO_PCI) += pds_vfio.o
>>
>> pds_vfio-y := \
>> cmds.o \
>> + lm.o \
>> pci_drv.o \
>> vfio_dev.o
>> diff --git a/drivers/vfio/pci/pds/cmds.c b/drivers/vfio/pci/pds/cmds.c
>> index ae01f5df2f5c..256f458feb58 100644
>> --- a/drivers/vfio/pci/pds/cmds.c
>> +++ b/drivers/vfio/pci/pds/cmds.c
>> @@ -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 +12,34 @@
>> #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,
>> + size_t req_len,
>> + union pds_core_adminq_comp *resp,
>> + u64 flags)
>
> Why u64? Do we expect more flags to follow? The core interface below
> only takes a bool(fast_poll) though.
>
> Thanks,
> Shameer >
Shameer,
Another good catch. This was leftover from the original set of patches,
but using flags is definitely unnecessary in
pds_vfio_client_adminq_cmd(). If we ever need more flags I can update
then. I will change this to a bool in the next revision.
Thanks for the review,
Brett
>> +{
>> + union pds_core_adminq_cmd cmd = {};
>> + size_t cp_len;
>> + 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);
>> + cp_len = min_t(size_t, req_len, sizeof(cmd.client_request.client_cmd));
>> + memcpy(cmd.client_request.client_cmd, req, cp_len);
>> +
>> + err = pdsc_adminq_post(pds_vfio->pdsc, &cmd, resp,
>> + !!(flags & PDS_AQ_FLAG_FASTPOLL));
>> + if (err && err != -EAGAIN)
>> + dev_info(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);
>> @@ -41,3 +70,293 @@ 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, sizeof(cmd),
>> + &comp, PDS_AQ_FLAG_FASTPOLL);
>> + 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)
>> +{
>> + union pds_core_adminq_cmd cmd = {
>> + .lm_suspend = {
>> + .opcode = PDS_LM_CMD_SUSPEND,
>> + .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: Suspend device\n", pds_vfio->vf_id);
>> +
>> + err = pds_vfio_client_adminq_cmd(pds_vfio, &cmd, sizeof(cmd),
>> &comp,
>> + PDS_AQ_FLAG_FASTPOLL);
>> + if (err) {
>> + dev_err(dev, "vf%u: Suspend failed: %pe\n", pds_vfio->vf_id,
>> + ERR_PTR(err));
>> + return err;
>> + }
>> +
>> + return pds_vfio_suspend_wait_device_cmd(pds_vfio);
>> +}
>> +
>> +int pds_vfio_resume_device_cmd(struct pds_vfio_pci_device *pds_vfio)
>> +{
>> + union pds_core_adminq_cmd cmd = {
>> + .lm_resume = {
>> + .opcode = PDS_LM_CMD_RESUME,
>> + .vf_id = cpu_to_le16(pds_vfio->vf_id),
>> + },
>> + };
>> + 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, sizeof(cmd),
>> &comp,
>> + 0);
>> +}
>> +
>> +int pds_vfio_get_lm_status_cmd(struct pds_vfio_pci_device *pds_vfio, u64
>> *size)
>> +{
>> + union pds_core_adminq_cmd cmd = {
>> + .lm_status = {
>> + .opcode = PDS_LM_CMD_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 = {};
>> + int err;
>> +
>> + dev_dbg(dev, "vf%u: Get migration status\n", pds_vfio->vf_id);
>> +
>> + err = pds_vfio_client_adminq_cmd(pds_vfio, &cmd, sizeof(cmd), &comp,
>> 0);
>> + if (err)
>> + return err;
>> +
>> + *size = le64_to_cpu(comp.lm_status.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, sizeof(cmd), &comp,
>> 0);
>> + 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, sizeof(cmd), &comp,
>> 0);
>> + 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, sizeof(cmd), &comp,
>> 0);
>> + if (err)
>> + dev_warn(dev, "failed to send host VF migration status: %pe\n",
>> + ERR_PTR(err));
>> +}
>> diff --git a/drivers/vfio/pci/pds/cmds.h b/drivers/vfio/pci/pds/cmds.h
>> index 4c592afccf89..3d8a5508c733 100644
>> --- a/drivers/vfio/pci/pds/cmds.h
>> +++ b/drivers/vfio/pci/pds/cmds.h
>> @@ -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);
>> +int pds_vfio_resume_device_cmd(struct pds_vfio_pci_device *pds_vfio);
>> +int pds_vfio_get_lm_status_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_ */
>> diff --git a/drivers/vfio/pci/pds/lm.c b/drivers/vfio/pci/pds/lm.c
>> new file mode 100644
>> index 000000000000..c507f39a2339
>> --- /dev/null
>> +++ b/drivers/vfio/pci/pds/lm.c
>> @@ -0,0 +1,421 @@
>> +// 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;
>> + int err;
>> + u64 size;
>> +
>> + /* Get live migration state size in this state */
>> + err = pds_vfio_get_lm_status_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);
>> + 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);
>> + 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)
>> + return NULL;
>> +
>> + if (cur == VFIO_DEVICE_STATE_RUNNING_P2P && next ==
>> VFIO_DEVICE_STATE_STOP)
>> + return NULL;
>> +
>> + return ERR_PTR(-EINVAL);
>> +}
>> diff --git a/drivers/vfio/pci/pds/lm.h b/drivers/vfio/pci/pds/lm.h
>> new file mode 100644
>> index 000000000000..13be893198b7
>> --- /dev/null
>> +++ b/drivers/vfio/pci/pds/lm.h
>> @@ -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_ */
>> diff --git a/drivers/vfio/pci/pds/pci_drv.c b/drivers/vfio/pci/pds/pci_drv.c
>> index a49420aa9736..ffd47fa8ede3 100644
>> --- a/drivers/vfio/pci/pds/pci_drv.c
>> +++ b/drivers/vfio/pci/pds/pci_drv.c
>> @@ -73,11 +73,24 @@ 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,
>> };
>>
>> diff --git a/drivers/vfio/pci/pds/vfio_dev.c b/drivers/vfio/pci/pds/vfio_dev.c
>> index 39771265b78f..2435d8255366 100644
>> --- a/drivers/vfio/pci/pds/vfio_dev.c
>> +++ b/drivers/vfio/pci/pds/vfio_dev.c
>> @@ -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 =
>> @@ -34,6 +132,9 @@ static int pds_vfio_init_device(struct vfio_device
>> *vdev)
>> pds_vfio->vf_id = pci_iov_vf_id(pdev);
>> pds_vfio->pci_id = PCI_DEVID(pdev->bus->number, pdev->devfn);
>>
>> + vdev->migration_flags = VFIO_MIGRATION_STOP_COPY |
>> VFIO_MIGRATION_P2P;
>> + vdev->mig_ops = &pds_vfio_lm_ops;
>> +
>> dev_dbg(&pdev->dev,
>> "%s: PF %#04x VF %#04x (%d) vf_id %d domain %d
>> pds_vfio %p\n",
>> __func__, pci_dev_id(pdev->physfn), pds_vfio->pci_id,
>> @@ -54,17 +155,34 @@ 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,
>> diff --git a/drivers/vfio/pci/pds/vfio_dev.h b/drivers/vfio/pci/pds/vfio_dev.h
>> index 92e8ff241ca8..df6208a7140b 100644
>> --- a/drivers/vfio/pci/pds/vfio_dev.h
>> +++ b/drivers/vfio/pci/pds/vfio_dev.h
>> @@ -7,12 +7,21 @@
>> #include <linux/pci.h>
>> #include <linux/vfio_pci_core.h>
>>
>> +#include "lm.h"
>> +
>> struct pdsc;
>>
>> struct pds_vfio_pci_device {
>> struct vfio_pci_core_device vfio_coredev;
>> struct pdsc *pdsc;
>>
>> + 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;
>> int pci_id;
>> u16 client_id;
>> @@ -20,7 +29,9 @@ struct pds_vfio_pci_device {
>>
>> 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_ */
>> diff --git a/include/linux/pds/pds_adminq.h
>> b/include/linux/pds/pds_adminq.h
>> index 98a60ce87b92..db6de081f15f 100644
>> --- a/include/linux/pds/pds_adminq.h
>> +++ b/include/linux/pds/pds_adminq.h
>> @@ -584,6 +584,213 @@ struct pds_core_q_init_comp {
>> u8 color;
>> };
>>
>> +#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_STATUS = 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_comp - generic command completion
>> + * @status: Status of the command (enum pds_core_status_code)
>> + * @rsvd: Structure padding to 16 Bytes
>> + */
>> +struct pds_lm_comp {
>> + u8 status;
>> + u8 rsvd[15];
>> +};
>> +
>> +/**
>> + * struct pds_lm_status_cmd - STATUS command
>> + * @opcode: Opcode
>> + * @rsvd: Word boundary padding
>> + * @vf_id: VF id
>> + */
>> +struct pds_lm_status_cmd {
>> + u8 opcode;
>> + u8 rsvd;
>> + __le16 vf_id;
>> +};
>> +
>> +/**
>> + * struct pds_lm_status_comp - STATUS 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_status_comp {
>> + u8 status;
>> + u8 rsvd;
>> + __le16 comp_index;
>> + union {
>> + __le64 size;
>> + u8 rsvd2[11];
>> + } __packed;
>> + u8 color;
>> +};
>> +
>> +/**
>> + * struct pds_lm_suspend_cmd - SUSPEND command
>> + * @opcode: Opcode PDS_LM_CMD_SUSPEND
>> + * @rsvd: Word boundary padding
>> + * @vf_id: VF id
>> + */
>> +struct pds_lm_suspend_cmd {
>> + u8 opcode;
>> + u8 rsvd;
>> + __le16 vf_id;
>> +};
>> +
>> +/**
>> + * struct pds_lm_suspend_comp - SUSPEND 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
>> + * @state_size: Size of the device state computed post suspend
>> + * @rsvd2: Word boundary padding
>> + * @color: Color bit
>> + */
>> +struct pds_lm_suspend_comp {
>> + u8 status;
>> + u8 rsvd;
>> + __le16 comp_index;
>> + union {
>> + __le64 state_size;
>> + u8 rsvd2[11];
>> + } __packed;
>> + u8 color;
>> +};
>> +
>> +/**
>> + * 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
>> + */
>> +struct pds_lm_suspend_status_cmd {
>> + u8 opcode;
>> + u8 rsvd;
>> + __le16 vf_id;
>> +};
>> +
>> +/**
>> + * struct pds_lm_resume_cmd - RESUME command
>> + * @opcode: Opcode PDS_LM_CMD_RESUME
>> + * @rsvd: Word boundary padding
>> + * @vf_id: VF id
>> + */
>> +struct pds_lm_resume_cmd {
>> + u8 opcode;
>> + u8 rsvd;
>> + __le16 vf_id;
>> +};
>> +
>> +/**
>> + * 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];
>> @@ -600,6 +807,14 @@ union pds_core_adminq_cmd {
>>
>> struct pds_core_q_identify_cmd q_ident;
>> struct pds_core_q_init_cmd q_init;
>> +
>> + 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_status_cmd lm_status;
>> + 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 {
>> @@ -621,6 +836,8 @@ union pds_core_adminq_comp {
>>
>> struct pds_core_q_identify_comp q_ident;
>> struct pds_core_q_init_comp q_init;
>> +
>> + struct pds_lm_status_comp lm_status;
>> };
>>
>> #ifndef __CHECKER__
>> --
>> 2.17.1
>
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