Re: [RFC PATCH v2 vfio 3/7] vfio/pds: Add VFIO live migration support

Shannon Nelson
2023-01-03T20:23:50Z

On 1/3/23 4:25 AM, liulongfang wrote:
> On 2022/12/15 7:21, Brett Creeley wrote:
>> Add live migration support via the VFIO subsystem. The migration
>> implementation aligns with the definition from uapi/vfio.h and uses the
>> auxiliary bus connection between pds_core/pds_vfio to communicate with
>> the device.
>>
>> 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.
>>
>
> Hi, this PDS is an NVME storage disk. When it supports live migration,
> the amount of data stored on the disk is so large.
> How do you realize the migration of a large amount of data in the disk
> in a short period of time?

In our case we are not providing the actual storage, but a fabric
initiator to a separate remote target that the migration target can also
access.

sln

>
> Thanks,
> Longfang.
>
>> 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@amd.com>
>> Signed-off-by: Shannon Nelson <shannon.nelson@amd.com>
>> ---
>> drivers/vfio/pci/pds/Makefile | 1 +
>> drivers/vfio/pci/pds/aux_drv.c | 1 +
>> drivers/vfio/pci/pds/cmds.c | 312 ++++++++++++++++++++
>> drivers/vfio/pci/pds/cmds.h | 15 +
>> drivers/vfio/pci/pds/lm.c | 491 ++++++++++++++++++++++++++++++++
>> drivers/vfio/pci/pds/lm.h | 43 +++
>> drivers/vfio/pci/pds/pci_drv.c | 15 +
>> drivers/vfio/pci/pds/vfio_dev.c | 119 +++++++-
>> drivers/vfio/pci/pds/vfio_dev.h | 12 +
>> include/linux/pds/pds_lm.h | 206 ++++++++++++++
>> 10 files changed, 1214 insertions(+), 1 deletion(-)
>> 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 49bf8289739b..b4980323cff4 100644
>> --- a/drivers/vfio/pci/pds/Makefile
>> +++ b/drivers/vfio/pci/pds/Makefile
>> @@ -4,5 +4,6 @@ obj-$(CONFIG_PDS_VFIO_PCI) += pds_vfio.o
>> pds_vfio-y := \
>> aux_drv.o \
>> cmds.o \
>> + lm.o \
>> pci_drv.o \
>> vfio_dev.o
>> diff --git a/drivers/vfio/pci/pds/aux_drv.c b/drivers/vfio/pci/pds/aux_drv.c
>> index 494551894926..59b43075e85f 100644
>> --- a/drivers/vfio/pci/pds/aux_drv.c
>> +++ b/drivers/vfio/pci/pds/aux_drv.c
>> @@ -77,6 +77,7 @@ pds_vfio_aux_probe(struct auxiliary_device *aux_dev,
>> dev_dbg(dev, "%s: id %#04x busnr %#x devfn %#x bus %p pds_vfio %p\n",
>> __func__, padev->id, busnr, devfn, bus, vfio_aux->pds_vfio);
>>
>> + vfio_aux->pds_vfio->coredev = aux_dev->dev.parent;
>> vfio_aux->pds_vfio->vfio_aux = vfio_aux;
>>
>> vfio_aux->padrv.event_handler = pds_vfio_aux_notify_handler;
>> diff --git a/drivers/vfio/pci/pds/cmds.c b/drivers/vfio/pci/pds/cmds.c
>> index 5a3fadcd38d8..11823d824ccc 100644
>> --- a/drivers/vfio/pci/pds/cmds.c
>> +++ b/drivers/vfio/pci/pds/cmds.c
>> @@ -3,9 +3,11 @@
>>
>> #include <linux/io.h>
>> #include <linux/types.h>
>> +#include <linux/delay.h>
>>
>> #include <linux/pds/pds_core_if.h>
>> #include <linux/pds/pds_adminq.h>
>> +#include <linux/pds/pds_lm.h>
>> #include <linux/pds/pds_auxbus.h>
>>
>> #include "vfio_dev.h"
>> @@ -28,3 +30,313 @@ pds_vfio_unregister_client_cmd(struct pds_vfio_pci_device *pds_vfio)
>>
>> padev->ops->unregister_client(padev);
>> }
>> +
>> +#define SUSPEND_TIMEOUT_S 5
>> +#define SUSPEND_CHECK_INTERVAL_MS 1
>> +
>> +static int
>> +pds_vfio_suspend_wait_device_cmd(struct pds_vfio_pci_device *pds_vfio)
>> +{
>> + struct pds_lm_suspend_status_cmd cmd = {
>> + .opcode = PDS_LM_CMD_SUSPEND_STATUS,
>> + .vf_id = cpu_to_le16(pds_vfio->vf_id),
>> + };
>> + struct pci_dev *pdev = pds_vfio->pdev;
>> + struct pds_lm_comp comp = { 0 };
>> + struct pds_auxiliary_dev *padev;
>> + unsigned long time_limit;
>> + unsigned long time_start;
>> + unsigned long time_done;
>> + int err;
>> +
>> + padev = pds_vfio->vfio_aux->padev;
>> +
>> + time_start = jiffies;
>> + time_limit = time_start + HZ * SUSPEND_TIMEOUT_S;
>> + do {
>> + err = padev->ops->adminq_cmd(padev,
>> + (union pds_core_adminq_cmd *)&cmd,
>> + sizeof(cmd),
>> + (union pds_core_adminq_comp *)&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(&pdev->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(&pdev->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)
>> +{
>> + struct pds_lm_suspend_cmd cmd = {
>> + .opcode = PDS_LM_CMD_SUSPEND,
>> + .vf_id = cpu_to_le16(pds_vfio->vf_id),
>> + };
>> + struct pds_lm_suspend_comp comp = {0};
>> + struct pci_dev *pdev = pds_vfio->pdev;
>> + struct pds_auxiliary_dev *padev;
>> + int err;
>> +
>> + dev_dbg(&pdev->dev, "vf%u: Suspend device\n", pds_vfio->vf_id);
>> +
>> + padev = pds_vfio->vfio_aux->padev;
>> + err = padev->ops->adminq_cmd(padev,
>> + (union pds_core_adminq_cmd *)&cmd,
>> + sizeof(cmd),
>> + (union pds_core_adminq_comp *)&comp,
>> + PDS_AQ_FLAG_FASTPOLL);
>> + if (err) {
>> + dev_err(&pdev->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)
>> +{
>> + struct pds_lm_resume_cmd cmd = {
>> + .opcode = PDS_LM_CMD_RESUME,
>> + .vf_id = cpu_to_le16(pds_vfio->vf_id),
>> + };
>> + struct pds_auxiliary_dev *padev;
>> + struct pds_lm_comp comp = {0};
>> +
>> + dev_dbg(&pds_vfio->pdev->dev, "vf%u: Resume device\n", pds_vfio->vf_id);
>> +
>> + padev = pds_vfio->vfio_aux->padev;
>> + return padev->ops->adminq_cmd(padev,
>> + (union pds_core_adminq_cmd *)&cmd,
>> + sizeof(cmd),
>> + (union pds_core_adminq_comp *)&comp,
>> + 0);
>> +}
>> +
>> +int
>> +pds_vfio_get_lm_status_cmd(struct pds_vfio_pci_device *pds_vfio, u64 *size)
>> +{
>> + struct pds_lm_status_cmd cmd = {
>> + .opcode = PDS_LM_CMD_STATUS,
>> + .vf_id = cpu_to_le16(pds_vfio->vf_id),
>> + };
>> + struct pds_lm_status_comp comp = {0};
>> + struct pds_auxiliary_dev *padev;
>> + int err = 0;
>> +
>> + dev_dbg(&pds_vfio->pdev->dev, "vf%u: Get migration status\n",
>> + pds_vfio->vf_id);
>> +
>> + padev = pds_vfio->vfio_aux->padev;
>> + err = padev->ops->adminq_cmd(padev,
>> + (union pds_core_adminq_cmd *)&cmd,
>> + sizeof(cmd),
>> + (union pds_core_adminq_comp *)&comp,
>> + 0);
>> + if (err)
>> + return err;
>> +
>> + *size = le64_to_cpu(comp.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;
>> + int err = 0;
>> + int i;
>> +
>> + if (!lm_file)
>> + return -EINVAL;
>> +
>> + /* dma map file pages */
>> + err = dma_map_sgtable(dev, &lm_file->sg_table, dir, 0);
>> + if (err)
>> + goto err_dma_map_sg;
>> +
>> + lm_file->num_sge = lm_file->sg_table.nents;
>> +
>> + /* alloc sgl */
>> + sgl = dma_alloc_coherent(dev, lm_file->num_sge *
>> + sizeof(struct pds_lm_sg_elem),
>> + &lm_file->sgl_addr, GFP_KERNEL);
>> + if (!sgl) {
>> + err = -ENOMEM;
>> + goto err_alloc_sgl;
>> + }
>> +
>> + lm_file->sgl = sgl;
>> +
>> + /* 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++;
>> + }
>> +
>> + return 0;
>> +
>> +err_alloc_sgl:
>> + dma_unmap_sgtable(dev, &lm_file->sg_table, dir, 0);
>> +err_dma_map_sg:
>> + 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_free_coherent(dev, lm_file->num_sge *
>> + sizeof(struct pds_lm_sg_elem),
>> + lm_file->sgl, lm_file->sgl_addr);
>> + 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)
>> +{
>> + struct pds_lm_save_cmd cmd = {
>> + .opcode = PDS_LM_CMD_SAVE,
>> + .vf_id = cpu_to_le16(pds_vfio->vf_id),
>> + };
>> + struct pci_dev *pdev = pds_vfio->pdev;
>> + struct pds_vfio_lm_file *lm_file;
>> + struct pds_auxiliary_dev *padev;
>> + struct pds_lm_comp comp = {0};
>> + int err;
>> +
>> + dev_dbg(&pdev->dev, "vf%u: Get migration state\n", pds_vfio->vf_id);
>> +
>> + lm_file = pds_vfio->save_file;
>> +
>> + padev = pds_vfio->vfio_aux->padev;
>> + err = pds_vfio_dma_map_lm_file(pds_vfio->coredev, 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.sgl_addr = cpu_to_le64(lm_file->sgl_addr);
>> + cmd.num_sge = cpu_to_le32(lm_file->num_sge);
>> +
>> + err = padev->ops->adminq_cmd(padev,
>> + (union pds_core_adminq_cmd *)&cmd,
>> + sizeof(cmd),
>> + (union pds_core_adminq_comp *)&comp,
>> + 0);
>> + if (err)
>> + dev_err(&pdev->dev, "failed to get migration state: %pe\n",
>> + ERR_PTR(err));
>> +
>> + pds_vfio_dma_unmap_lm_file(pds_vfio->coredev, DMA_FROM_DEVICE, lm_file);
>> +
>> + return err;
>> +}
>> +
>> +int
>> +pds_vfio_set_lm_state_cmd(struct pds_vfio_pci_device *pds_vfio)
>> +{
>> + struct pds_lm_restore_cmd cmd = {
>> + .opcode = PDS_LM_CMD_RESTORE,
>> + .vf_id = cpu_to_le16(pds_vfio->vf_id),
>> + };
>> + struct pci_dev *pdev = pds_vfio->pdev;
>> + struct pds_vfio_lm_file *lm_file;
>> + struct pds_auxiliary_dev *padev;
>> + struct pds_lm_comp comp = {0};
>> + int err;
>> +
>> + dev_dbg(&pdev->dev, "vf%u: Set migration state\n", pds_vfio->vf_id);
>> +
>> + lm_file = pds_vfio->restore_file;
>> +
>> + padev = pds_vfio->vfio_aux->padev;
>> + err = pds_vfio_dma_map_lm_file(pds_vfio->coredev, 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.sgl_addr = cpu_to_le64(lm_file->sgl_addr);
>> + cmd.num_sge = cpu_to_le32(lm_file->num_sge);
>> +
>> + err = padev->ops->adminq_cmd(padev,
>> + (union pds_core_adminq_cmd *)&cmd,
>> + sizeof(cmd),
>> + (union pds_core_adminq_comp *)&comp,
>> + 0);
>> + if (err)
>> + dev_err(&pdev->dev, "failed to set migration state: %pe\n",
>> + ERR_PTR(err));
>> +
>> + pds_vfio_dma_unmap_lm_file(pds_vfio->coredev, 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)
>> +{
>> + struct pds_auxiliary_dev *padev = pds_vfio->vfio_aux->padev;
>> + struct pds_lm_host_vf_status_cmd cmd = {
>> + .opcode = PDS_LM_CMD_HOST_VF_STATUS,
>> + .vf_id = cpu_to_le16(pds_vfio->vf_id),
>> + .status = vf_status,
>> + };
>> + struct pci_dev *pdev = pds_vfio->pdev;
>> + struct pds_lm_comp comp = {0};
>> + int err;
>> +
>> + dev_dbg(&pdev->dev, "vf%u: Set host VF LM status: %u",
>> + pds_vfio->vf_id, cmd.status);
>> + if (vf_status != PDS_LM_STA_IN_PROGRESS &&
>> + vf_status != PDS_LM_STA_NONE) {
>> + dev_warn(&pdev->dev, "Invalid host VF migration status, %d\n",
>> + vf_status);
>> + return;
>> + }
>> +
>> + err = padev->ops->adminq_cmd(padev,
>> + (union pds_core_adminq_cmd *)&cmd,
>> + sizeof(cmd),
>> + (union pds_core_adminq_comp *)&comp,
>> + 0);
>> + if (err)
>> + dev_warn(&pdev->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 7fe2d1efd894..5f9ac45ee5a3 100644
>> --- a/drivers/vfio/pci/pds/cmds.h
>> +++ b/drivers/vfio/pci/pds/cmds.h
>> @@ -4,11 +4,26 @@
>> #ifndef _CMDS_H_
>> #define _CMDS_H_
>>
>> +#include <linux/pds/pds_lm.h>
>> +
>> struct pds_vfio_pci_device;
>>
>> 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..86152b18a5b7
>> --- /dev/null
>> +++ b/drivers/vfio/pci/pds/lm.c
>> @@ -0,0 +1,491 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/* Copyright(c) 2022 Pensando Systems, 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 "cmds.h"
>> +#include "vfio_dev.h"
>> +
>> +#define PDS_VFIO_LM_FILENAME "pds_vfio_lm"
>> +
>> +const char *
>> +pds_vfio_lm_state(enum vfio_device_mig_state state)
>> +{
>> + switch (state) {
>> + case VFIO_DEVICE_STATE_ERROR:
>> + return "VFIO_DEVICE_STATE_ERROR";
>> + case VFIO_DEVICE_STATE_STOP:
>> + return "VFIO_DEVICE_STATE_STOP";
>> + case VFIO_DEVICE_STATE_RUNNING:
>> + return "VFIO_DEVICE_STATE_RUNNING";
>> + case VFIO_DEVICE_STATE_STOP_COPY:
>> + return "VFIO_DEVICE_STATE_STOP_COPY";
>> + case VFIO_DEVICE_STATE_RESUMING:
>> + return "VFIO_DEVICE_STATE_RESUMING";
>> + case VFIO_DEVICE_STATE_RUNNING_P2P:
>> + return "VFIO_DEVICE_STATE_RUNNING_P2P";
>> + default:
>> + return "VFIO_DEVICE_STATE_INVALID";
>> + }
>> +
>> + return "VFIO_DEVICE_STATE_INVALID";
>> +}
>> +
>> +static struct pds_vfio_lm_file *
>> +pds_vfio_get_lm_file(const char *name, const struct file_operations *fops,
>> + int flags, u64 size)
>> +{
>> + struct pds_vfio_lm_file *lm_file = NULL;
>> + unsigned long long npages;
>> + unsigned long long i;
>> + struct page **pages;
>> + int err = 0;
>> +
>> + 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(name, fops, lm_file, flags);
>> + if (!lm_file->filep)
>> + goto err_get_file;
>> +
>> + stream_open(lm_file->filep->f_inode, lm_file->filep);
>> + mutex_init(&lm_file->lock);
>> +
>> + lm_file->size = size;
>> +
>> + /* Allocate memory for file pages */
>> + npages = DIV_ROUND_UP_ULL(lm_file->size, PAGE_SIZE);
>> +
>> + pages = kcalloc(npages, sizeof(*pages), GFP_KERNEL);
>> + if (!pages)
>> + goto err_alloc_pages;
>> +
>> + for (i = 0; i < npages; i++) {
>> + pages[i] = alloc_page(GFP_KERNEL);
>> + if (!pages[i])
>> + goto err_alloc_page;
>> + }
>> +
>> + lm_file->pages = pages;
>> + lm_file->npages = npages;
>> + lm_file->alloc_size = npages * PAGE_SIZE;
>> +
>> + /* Create scatterlist of file pages to use for DMA mapping later */
>> + err = sg_alloc_table_from_pages(&lm_file->sg_table, pages, npages,
>> + 0, size, GFP_KERNEL);
>> + if (err)
>> + goto err_alloc_sg_table;
>> +
>> + return lm_file;
>> +
>> +err_alloc_sg_table:
>> +err_alloc_page:
>> + /* free allocated pages */
>> + for (i = 0; i < npages && pages[i]; i++)
>> + __free_page(pages[i]);
>> + kfree(pages);
>> +err_alloc_pages:
>> + fput(lm_file->filep);
>> + mutex_destroy(&lm_file->lock);
>> +err_get_file:
>> + kfree(lm_file);
>> +
>> + return NULL;
>> +}
>> +
>> +static void
>> +pds_vfio_put_lm_file(struct pds_vfio_lm_file *lm_file)
>> +{
>> + unsigned long long i;
>> +
>> + 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);
>> +
>> + /* Free allocated file pages */
>> + for (i = 0; i < lm_file->npages && lm_file->pages[i]; i++)
>> + __free_page(lm_file->pages[i]);
>> + kfree(lm_file->pages);
>> + lm_file->pages = NULL;
>> +
>> + /* Delete file */
>> + fput(lm_file->filep);
>> + lm_file->filep = NULL;
>> +
>> + mutex_unlock(&lm_file->lock);
>> +
>> + mutex_destroy(&lm_file->lock);
>> +
>> + /* Free file structure */
>> + kfree(lm_file);
>> +}
>> +
>> +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;
>> +
>> + lm_file->size = 0;
>> +
>> + 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 pci_dev *pdev = pds_vfio->pdev;
>> + struct pds_vfio_lm_file *lm_file;
>> + int err = 0;
>> + u64 size;
>> +
>> + /* Get live migration state size in this state */
>> + err = pds_vfio_get_lm_status_cmd(pds_vfio, &size);
>> + if (err) {
>> + dev_err(&pdev->dev, "failed to get save status: %pe\n",
>> + ERR_PTR(err));
>> + goto err_get_lm_status;
>> + }
>> +
>> + dev_dbg(&pdev->dev, "save status, size = %lld\n", size);
>> +
>> + if (!size) {
>> + err = -EIO;
>> + dev_err(&pdev->dev, "invalid state size\n");
>> + goto err_get_lm_status;
>> + }
>> +
>> + lm_file = pds_vfio_get_lm_file(PDS_VFIO_LM_FILENAME,
>> + &pds_vfio_save_fops,
>> + O_RDONLY, size);
>> + if (!lm_file) {
>> + err = -ENOENT;
>> + dev_err(&pdev->dev, "failed to create save file\n");
>> + goto err_get_lm_file;
>> + }
>> +
>> + dev_dbg(&pdev->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;
>> +
>> +err_get_lm_file:
>> +err_get_lm_status:
>> + return err;
>> +}
>> +
>> +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 pci_dev *pdev = pds_vfio->pdev;
>> + struct pds_vfio_lm_file *lm_file;
>> + int err = 0;
>> + u64 size;
>> +
>> + size = sizeof(union pds_lm_dev_state);
>> +
>> + dev_dbg(&pdev->dev, "restore status, size = %lld\n", size);
>> +
>> + if (!size) {
>> + err = -EIO;
>> + dev_err(&pdev->dev, "invalid state size");
>> + goto err_get_lm_status;
>> + }
>> +
>> + lm_file = pds_vfio_get_lm_file(PDS_VFIO_LM_FILENAME,
>> + &pds_vfio_restore_fops,
>> + O_WRONLY, size);
>> + if (!lm_file) {
>> + err = -ENOENT;
>> + dev_err(&pdev->dev, "failed to create restore file");
>> + goto err_get_lm_file;
>> + }
>> + pds_vfio->restore_file = lm_file;
>> +
>> + return 0;
>> +
>> +err_get_lm_file:
>> +err_get_lm_status:
>> + return err;
>> +}
>> +
>> +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;
>> + struct device *dev = &pds_vfio->pdev->dev;
>> + int err = 0;
>> +
>> + dev_dbg(dev, "%s => %s\n",
>> + pds_vfio_lm_state(cur), pds_vfio_lm_state(next));
>> +
>> + if (cur == VFIO_DEVICE_STATE_STOP && next == VFIO_DEVICE_STATE_STOP_COPY) {
>> + /* Device is already stopped
>> + * create save device data file & get device state from firmware
>> + */
>> + err = pds_vfio_get_save_file(pds_vfio);
>> + if (err)
>> + return ERR_PTR(err);
>> +
>> + /* Get device state */
>> + 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) {
>> + /* Device is already stopped
>> + * delete the save device state file
>> + */
>> + 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) {
>> + /* create resume device data file */
>> + 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) {
>> + /* Set device state */
>> + err = pds_vfio_set_lm_state_cmd(pds_vfio);
>> + if (err)
>> + return ERR_PTR(err);
>> +
>> + /* delete resume device data file */
>> + 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);
>> + /* Device should be stopped
>> + * no interrupts, dma or change in internal state
>> + */
>> + 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) {
>> + /* Device should be functional
>> + * interrupts, dma, mmio or changes to internal state is allowed
>> + */
>> + 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..3dd97b807db6
>> --- /dev/null
>> +++ b/drivers/vfio/pci/pds/lm.h
>> @@ -0,0 +1,43 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/* Copyright(c) 2022 Pensando Systems, 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/vfio.h>
>> +
>> +#include <linux/pds/pds_lm.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 */
>> + 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);
>> +const char *
>> +pds_vfio_lm_state(enum vfio_device_mig_state state);
>> +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 d6ad15719ec4..aafa013ee8c2 100644
>> --- a/drivers/vfio/pci/pds/pci_drv.c
>> +++ b/drivers/vfio/pci/pds/pci_drv.c
>> @@ -67,12 +67,27 @@ 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 = PDS_VFIO_DRV_NAME,
>> .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 30c3bb47a2be..d28f96f93097 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"
>> #include "aux_drv.h"
>>
>> @@ -16,6 +17,97 @@ 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;
>> +
>> + if (!pds_vfio->vfio_aux)
>> + return ERR_PTR(-ENODEV);
>> +
>> + 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 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
>> +};
>> +
>> static int
>> pds_vfio_init_device(struct vfio_device *vdev)
>> {
>> @@ -35,10 +127,19 @@ pds_vfio_init_device(struct vfio_device *vdev)
>> vfio_aux = pds_vfio_aux_get_drvdata(pds_vfio->pci_id);
>> if (vfio_aux) {
>> vfio_aux->pds_vfio = pds_vfio;
>> + pds_vfio->coredev = vfio_aux->padev->aux_dev.dev.parent;
>> pds_vfio->vfio_aux = vfio_aux;
>> pds_vfio_put_aux_dev(vfio_aux);
>> }
>>
>> + 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 vfio_aux %p pds_vfio %p\n",
>> + __func__, pci_dev_id(pdev->physfn),
>> + pds_vfio->pci_id, pds_vfio->pci_id, pds_vfio->vf_id,
>> + pci_domain_nr(pdev->bus), pds_vfio->vfio_aux, pds_vfio);
>> +
>> return 0;
>> }
>>
>> @@ -54,18 +155,34 @@ pds_vfio_open_device(struct vfio_device *vdev)
>> if (err)
>> return err;
>>
>> + mutex_init(&pds_vfio->state_mutex);
>> + dev_dbg(&pds_vfio->pdev->dev, "%s: %s => VFIO_DEVICE_STATE_RUNNING\n",
>> + __func__, pds_vfio_lm_state(pds_vfio->state));
>> + 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_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 b16668693e1f..a09570eec6fa 100644
>> --- a/drivers/vfio/pci/pds/vfio_dev.h
>> +++ b/drivers/vfio/pci/pds/vfio_dev.h
>> @@ -7,10 +7,20 @@
>> #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 pci_dev *pdev;
>> struct pds_vfio_aux *vfio_aux;
>> + struct device *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;
>> int pci_id;
>> @@ -20,5 +30,7 @@ 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);
>>
>> #endif /* _VFIO_DEV_H_ */
>> diff --git a/include/linux/pds/pds_lm.h b/include/linux/pds/pds_lm.h
>> index fdaf2bf71d35..28ebd62f7583 100644
>> --- a/include/linux/pds/pds_lm.h
>> +++ b/include/linux/pds/pds_lm.h
>> @@ -8,5 +8,211 @@
>>
>> #define PDS_DEV_TYPE_LM_STR "LM"
>> #define PDS_LM_DEV_NAME PDS_CORE_DRV_NAME "." PDS_DEV_TYPE_LM_STR
>> +#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;
>> +};
>>
>> #endif /* _PDS_LM_H_ */
>>