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Message-ID: <e2ed042a061a4de3827f60e1bd695cfc@huawei.com>
Date: Thu, 15 Jun 2023 21:07:43 +0000
From: Shameerali Kolothum Thodi <shameerali.kolothum.thodi@...wei.com>
To: 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
> -----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
> +{
> + 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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