[RFC v4 7/8] hisi_acc_vfio_pci: Add support for VFIO live migration
From: Shameer Kolothum
Date: Tue Feb 08 2022 - 08:37:14 EST
From: Longfang Liu <liulongfang@xxxxxxxxxx>
VMs assigned with HiSilicon ACC VF devices can now perform
live migration if the VF devices are bind to the hisi_acc_vfio_pci
driver.
Signed-off-by: Longfang Liu <liulongfang@xxxxxxxxxx>
Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@xxxxxxxxxx>
---
drivers/vfio/pci/hisi_acc_vfio_pci.c | 1007 +++++++++++++++++++++++++-
drivers/vfio/pci/hisi_acc_vfio_pci.h | 119 +++
2 files changed, 1108 insertions(+), 18 deletions(-)
create mode 100644 drivers/vfio/pci/hisi_acc_vfio_pci.h
diff --git a/drivers/vfio/pci/hisi_acc_vfio_pci.c b/drivers/vfio/pci/hisi_acc_vfio_pci.c
index 563ed2cc861f..613bf86ceabf 100644
--- a/drivers/vfio/pci/hisi_acc_vfio_pci.c
+++ b/drivers/vfio/pci/hisi_acc_vfio_pci.c
@@ -12,6 +12,944 @@
#include <linux/pci.h>
#include <linux/vfio.h>
#include <linux/vfio_pci_core.h>
+#include <linux/anon_inodes.h>
+
+#include "hisi_acc_vfio_pci.h"
+
+/* return 0 on VM acc device ready, -ETIMEDOUT hardware timeout */
+static int qm_wait_dev_not_ready(struct hisi_qm *qm)
+{
+ u32 val;
+
+ return readl_relaxed_poll_timeout(qm->io_base + QM_VF_STATE,
+ val, !(val & 0x1), MB_POLL_PERIOD_US,
+ MB_POLL_TIMEOUT_US);
+}
+
+/*
+ * Each state Reg is checked 100 times,
+ * with a delay of 100 microseconds after each check
+ */
+static u32 acc_check_reg_state(struct hisi_qm *qm, u32 regs)
+{
+ int check_times = 0;
+ u32 state;
+
+ state = readl(qm->io_base + regs);
+ while (state && check_times < ERROR_CHECK_TIMEOUT) {
+ udelay(CHECK_DELAY_TIME);
+ state = readl(qm->io_base + regs);
+ check_times++;
+ }
+
+ return state;
+}
+
+/* Check the PF's RAS state and Function INT state */
+static int qm_check_int_state(struct hisi_acc_vf_core_device *hisi_acc_vdev)
+{
+ struct hisi_qm *vfqm = &hisi_acc_vdev->vf_qm;
+ struct hisi_qm *qm = hisi_acc_vdev->pf_qm;
+ struct pci_dev *vf_pdev = hisi_acc_vdev->vf_dev;
+ struct device *dev = &qm->pdev->dev;
+ u32 state;
+
+ /* Check RAS state */
+ state = acc_check_reg_state(qm, QM_ABNORMAL_INT_STATUS);
+ if (state) {
+ dev_err(dev, "failed to check QM RAS state!\n");
+ return -EBUSY;
+ }
+
+ /* Check Function Communication state between PF and VF */
+ state = acc_check_reg_state(vfqm, QM_IFC_INT_STATUS);
+ if (state) {
+ dev_err(dev, "failed to check QM IFC INT state!\n");
+ return -EBUSY;
+ }
+ state = acc_check_reg_state(vfqm, QM_IFC_INT_SET_V);
+ if (state) {
+ dev_err(dev, "failed to check QM IFC INT SET state!\n");
+ return -EBUSY;
+ }
+
+ /* Check submodule task state */
+ switch (vf_pdev->device) {
+ case PCI_DEVICE_ID_HUAWEI_SEC_VF:
+ state = acc_check_reg_state(qm, SEC_CORE_INT_STATUS);
+ if (state) {
+ dev_err(dev, "failed to check QM SEC Core INT state!\n");
+ return -EBUSY;
+ }
+ return 0;
+ case PCI_DEVICE_ID_HUAWEI_HPRE_VF:
+ state = acc_check_reg_state(qm, HPRE_HAC_INT_STATUS);
+ if (state) {
+ dev_err(dev, "failed to check QM HPRE HAC INT state!\n");
+ return -EBUSY;
+ }
+ return 0;
+ case PCI_DEVICE_ID_HUAWEI_ZIP_VF:
+ state = acc_check_reg_state(qm, HZIP_CORE_INT_STATUS);
+ if (state) {
+ dev_err(dev, "failed to check QM ZIP Core INT state!\n");
+ return -EBUSY;
+ }
+ return 0;
+ default:
+ dev_err(dev, "failed to detect acc module type!\n");
+ return -EINVAL;
+ }
+}
+
+static int qm_read_reg(struct hisi_qm *qm, u32 reg_addr,
+ u32 *data, u8 nums)
+{
+ int i;
+
+ if (nums < 1 || nums > QM_REGS_MAX_LEN)
+ return -EINVAL;
+
+ for (i = 0; i < nums; i++) {
+ data[i] = readl(qm->io_base + reg_addr);
+ reg_addr += QM_REG_ADDR_OFFSET;
+ }
+
+ return 0;
+}
+
+static int qm_write_reg(struct hisi_qm *qm, u32 reg,
+ u32 *data, u8 nums)
+{
+ int i;
+
+ if (nums < 1 || nums > QM_REGS_MAX_LEN)
+ return -EINVAL;
+
+ for (i = 0; i < nums; i++)
+ writel(data[i], qm->io_base + reg + i * QM_REG_ADDR_OFFSET);
+
+ return 0;
+}
+
+static int qm_get_vft(struct hisi_qm *qm, u32 *base)
+{
+ u64 sqc_vft;
+ u32 qp_num;
+ int ret;
+
+ ret = qm_mb(qm, QM_MB_CMD_SQC_VFT_V2, 0, 0, 1);
+ if (ret)
+ return ret;
+
+ sqc_vft = readl(qm->io_base + QM_MB_CMD_DATA_ADDR_L) |
+ ((u64)readl(qm->io_base + QM_MB_CMD_DATA_ADDR_H) <<
+ QM_XQC_ADDR_OFFSET);
+ *base = QM_SQC_VFT_BASE_MASK_V2 & (sqc_vft >> QM_SQC_VFT_BASE_SHIFT_V2);
+ qp_num = (QM_SQC_VFT_NUM_MASK_V2 &
+ (sqc_vft >> QM_SQC_VFT_NUM_SHIFT_V2)) + 1;
+
+ return qp_num;
+}
+
+static int qm_get_sqc(struct hisi_qm *qm, u64 *addr)
+{
+ int ret;
+
+ ret = qm_mb(qm, QM_MB_CMD_SQC_BT, 0, 0, 1);
+ if (ret)
+ return ret;
+
+ *addr = readl(qm->io_base + QM_MB_CMD_DATA_ADDR_L) |
+ ((u64)readl(qm->io_base + QM_MB_CMD_DATA_ADDR_H) <<
+ QM_XQC_ADDR_OFFSET);
+
+ return 0;
+}
+
+static int qm_get_cqc(struct hisi_qm *qm, u64 *addr)
+{
+ int ret;
+
+ ret = qm_mb(qm, QM_MB_CMD_CQC_BT, 0, 0, 1);
+ if (ret)
+ return ret;
+
+ *addr = readl(qm->io_base + QM_MB_CMD_DATA_ADDR_L) |
+ ((u64)readl(qm->io_base + QM_MB_CMD_DATA_ADDR_H) <<
+ QM_XQC_ADDR_OFFSET);
+
+ return 0;
+}
+
+static int qm_rw_regs_read(struct hisi_qm *qm, struct acc_vf_data *vf_data)
+{
+ struct device *dev = &qm->pdev->dev;
+ int ret;
+
+ ret = qm_read_reg(qm, QM_VF_AEQ_INT_MASK, &vf_data->aeq_int_mask, 1);
+ if (ret) {
+ dev_err(dev, "failed to read QM_VF_AEQ_INT_MASK\n");
+ return ret;
+ }
+
+ ret = qm_read_reg(qm, QM_VF_EQ_INT_MASK, &vf_data->eq_int_mask, 1);
+ if (ret) {
+ dev_err(dev, "failed to read QM_VF_EQ_INT_MASK\n");
+ return ret;
+ }
+
+ ret = qm_read_reg(qm, QM_IFC_INT_SOURCE_V,
+ &vf_data->ifc_int_source, 1);
+ if (ret) {
+ dev_err(dev, "failed to read QM_IFC_INT_SOURCE_V\n");
+ return ret;
+ }
+
+ ret = qm_read_reg(qm, QM_IFC_INT_MASK, &vf_data->ifc_int_mask, 1);
+ if (ret) {
+ dev_err(dev, "failed to read QM_IFC_INT_MASK\n");
+ return ret;
+ }
+
+ ret = qm_read_reg(qm, QM_IFC_INT_SET_V, &vf_data->ifc_int_set, 1);
+ if (ret) {
+ dev_err(dev, "failed to read QM_IFC_INT_SET_V\n");
+ return ret;
+ }
+
+ ret = qm_read_reg(qm, QM_PAGE_SIZE, &vf_data->page_size, 1);
+ if (ret) {
+ dev_err(dev, "failed to read QM_PAGE_SIZE\n");
+ return ret;
+ }
+
+ /* QM_EQC_DW has 7 regs */
+ ret = qm_read_reg(qm, QM_EQC_DW0, vf_data->qm_eqc_dw, 7);
+ if (ret) {
+ dev_err(dev, "failed to read QM_EQC_DW\n");
+ return ret;
+ }
+
+ /* QM_AEQC_DW has 7 regs */
+ ret = qm_read_reg(qm, QM_AEQC_DW0, vf_data->qm_aeqc_dw, 7);
+ if (ret) {
+ dev_err(dev, "failed to read QM_AEQC_DW\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int qm_rw_regs_write(struct hisi_qm *qm, struct acc_vf_data *vf_data)
+{
+ struct device *dev = &qm->pdev->dev;
+ int ret;
+
+ /* check VF state */
+ if (unlikely(qm_wait_mb_ready(qm))) {
+ dev_err(&qm->pdev->dev, "QM device is not ready to write\n");
+ return -EBUSY;
+ }
+
+ ret = qm_write_reg(qm, QM_VF_AEQ_INT_MASK, &vf_data->aeq_int_mask, 1);
+ if (ret) {
+ dev_err(dev, "failed to write QM_VF_AEQ_INT_MASK\n");
+ return ret;
+ }
+
+ ret = qm_write_reg(qm, QM_VF_EQ_INT_MASK, &vf_data->eq_int_mask, 1);
+ if (ret) {
+ dev_err(dev, "failed to write QM_VF_EQ_INT_MASK\n");
+ return ret;
+ }
+
+ ret = qm_write_reg(qm, QM_IFC_INT_SOURCE_V,
+ &vf_data->ifc_int_source, 1);
+ if (ret) {
+ dev_err(dev, "failed to write QM_IFC_INT_SOURCE_V\n");
+ return ret;
+ }
+
+ ret = qm_write_reg(qm, QM_IFC_INT_MASK, &vf_data->ifc_int_mask, 1);
+ if (ret) {
+ dev_err(dev, "failed to write QM_IFC_INT_MASK\n");
+ return ret;
+ }
+
+ ret = qm_write_reg(qm, QM_IFC_INT_SET_V, &vf_data->ifc_int_set, 1);
+ if (ret) {
+ dev_err(dev, "failed to write QM_IFC_INT_SET_V\n");
+ return ret;
+ }
+
+ ret = qm_write_reg(qm, QM_QUE_ISO_CFG_V, &vf_data->que_iso_cfg, 1);
+ if (ret) {
+ dev_err(dev, "failed to write QM_QUE_ISO_CFG_V\n");
+ return ret;
+ }
+
+ ret = qm_write_reg(qm, QM_PAGE_SIZE, &vf_data->page_size, 1);
+ if (ret) {
+ dev_err(dev, "failed to write QM_PAGE_SIZE\n");
+ return ret;
+ }
+
+ /* QM_EQC_DW has 7 regs */
+ ret = qm_write_reg(qm, QM_EQC_DW0, vf_data->qm_eqc_dw, 7);
+ if (ret) {
+ dev_err(dev, "failed to write QM_EQC_DW\n");
+ return ret;
+ }
+
+ /* QM_AEQC_DW has 7 regs */
+ ret = qm_write_reg(qm, QM_AEQC_DW0, vf_data->qm_aeqc_dw, 7);
+ if (ret) {
+ dev_err(dev, "failed to write QM_AEQC_DW\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static void qm_db(struct hisi_qm *qm, u16 qn, u8 cmd,
+ u16 index, u8 priority)
+{
+ u64 doorbell;
+ u64 dbase;
+ u16 randata = 0;
+
+ if (cmd == QM_DOORBELL_CMD_SQ || cmd == QM_DOORBELL_CMD_CQ)
+ dbase = QM_DOORBELL_SQ_CQ_BASE_V2;
+ else
+ dbase = QM_DOORBELL_EQ_AEQ_BASE_V2;
+
+ doorbell = qn | ((u64)cmd << QM_DB_CMD_SHIFT_V2) |
+ ((u64)randata << QM_DB_RAND_SHIFT_V2) |
+ ((u64)index << QM_DB_INDEX_SHIFT_V2) |
+ ((u64)priority << QM_DB_PRIORITY_SHIFT_V2);
+
+ writeq(doorbell, qm->io_base + dbase);
+}
+
+static int pf_qm_get_qp_num(struct hisi_qm *qm, int vf_id, u32 *rbase)
+{
+ unsigned int val;
+ u64 sqc_vft;
+ u32 qp_num;
+ int ret;
+
+ ret = readl_relaxed_poll_timeout(qm->io_base + QM_VFT_CFG_RDY, val,
+ val & BIT(0), MB_POLL_PERIOD_US,
+ MB_POLL_TIMEOUT_US);
+ if (ret)
+ return ret;
+
+ writel(0x1, qm->io_base + QM_VFT_CFG_OP_WR);
+ /* 0 mean SQC VFT */
+ writel(0x0, qm->io_base + QM_VFT_CFG_TYPE);
+ writel(vf_id, qm->io_base + QM_VFT_CFG);
+
+ writel(0x0, qm->io_base + QM_VFT_CFG_RDY);
+ writel(0x1, qm->io_base + QM_VFT_CFG_OP_ENABLE);
+
+ ret = readl_relaxed_poll_timeout(qm->io_base + QM_VFT_CFG_RDY, val,
+ val & BIT(0), MB_POLL_PERIOD_US,
+ MB_POLL_TIMEOUT_US);
+ if (ret)
+ return ret;
+
+ sqc_vft = readl(qm->io_base + QM_VFT_CFG_DATA_L) |
+ ((u64)readl(qm->io_base + QM_VFT_CFG_DATA_H) <<
+ QM_XQC_ADDR_OFFSET);
+ *rbase = QM_SQC_VFT_BASE_MASK_V2 &
+ (sqc_vft >> QM_SQC_VFT_BASE_SHIFT_V2);
+ qp_num = (QM_SQC_VFT_NUM_MASK_V2 &
+ (sqc_vft >> QM_SQC_VFT_NUM_SHIFT_V2)) + 1;
+
+ return qp_num;
+}
+
+static int vf_migration_data_store(struct hisi_acc_vf_core_device *hisi_acc_vdev,
+ struct hisi_acc_vf_migration_file *migf)
+{
+ struct acc_vf_data *vf_data = &migf->vf_data;
+ struct hisi_qm *qm = &hisi_acc_vdev->vf_qm;
+ struct hisi_qm *pf_qm = hisi_acc_vdev->pf_qm;
+ int vf_id = hisi_acc_vdev->vf_id;
+ struct device *dev = &qm->pdev->dev;
+ int ret;
+
+ /* save device id */
+ vf_data->dev_id = hisi_acc_vdev->vf_dev->device;
+
+ /* vf qp num save from PF */
+ ret = pf_qm_get_qp_num(pf_qm, vf_id, &vf_data->qp_base);
+ if (ret <= 0) {
+ dev_err(dev, "failed to get vft qp nums!\n");
+ return -EINVAL;
+ }
+
+ vf_data->qp_num = ret;
+
+ /* VF isolation state save from PF */
+ ret = qm_read_reg(pf_qm, QM_QUE_ISO_CFG_V, &vf_data->que_iso_cfg, 1);
+ if (ret) {
+ dev_err(dev, "failed to read QM_QUE_ISO_CFG_V!\n");
+ return ret;
+ }
+
+ ret = qm_rw_regs_read(qm, vf_data);
+ if (ret)
+ return -EINVAL;
+
+ /* Every reg is 32 bit, the dma address is 64 bit. */
+ vf_data->eqe_dma = vf_data->qm_eqc_dw[2];
+ vf_data->eqe_dma <<= QM_XQC_ADDR_OFFSET;
+ vf_data->eqe_dma |= vf_data->qm_eqc_dw[1];
+ vf_data->aeqe_dma = vf_data->qm_aeqc_dw[2];
+ vf_data->aeqe_dma <<= QM_XQC_ADDR_OFFSET;
+ vf_data->aeqe_dma |= vf_data->qm_aeqc_dw[1];
+
+ /* Through SQC_BT/CQC_BT to get sqc and cqc address */
+ ret = qm_get_sqc(qm, &vf_data->sqc_dma);
+ if (ret) {
+ dev_err(dev, "failed to read SQC addr!\n");
+ return -EINVAL;
+ }
+
+ ret = qm_get_cqc(qm, &vf_data->cqc_dma);
+ if (ret) {
+ dev_err(dev, "failed to read CQC addr!\n");
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static void qm_dev_cmd_init(struct hisi_qm *qm)
+{
+ /* Clear VF communication status registers. */
+ writel(0x1, qm->io_base + QM_IFC_INT_SOURCE_V);
+
+ /* Enable pf and vf communication. */
+ writel(0x0, qm->io_base + QM_IFC_INT_MASK);
+}
+
+static int vf_qm_cache_wb(struct hisi_qm *qm)
+{
+ unsigned int val;
+
+ writel(0x1, qm->io_base + QM_CACHE_WB_START);
+ if (readl_relaxed_poll_timeout(qm->io_base + QM_CACHE_WB_DONE,
+ val, val & BIT(0), MB_POLL_PERIOD_US,
+ MB_POLL_TIMEOUT_US)) {
+ dev_err(&qm->pdev->dev, "vf QM writeback sqc cache fail\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static void vf_qm_fun_reset(struct hisi_acc_vf_core_device *hisi_acc_vdev,
+ struct hisi_qm *qm)
+{
+ int i;
+
+ for (i = 0; i < qm->qp_num; i++)
+ qm_db(qm, i, QM_DOORBELL_CMD_SQ, 0, 1);
+}
+
+static int vf_qm_func_stop(struct hisi_qm *qm)
+{
+ return qm_mb(qm, QM_MB_CMD_PAUSE_QM, 0, 0, 0);
+}
+
+static int vf_migration_data_recover(struct hisi_acc_vf_core_device *hisi_acc_vdev,
+ struct hisi_qm *qm)
+{
+ struct device *dev = &qm->pdev->dev;
+ struct acc_vf_data *vf_data = &hisi_acc_vdev->resuming_migf->vf_data;
+ int ret;
+
+ qm->eqe_dma = vf_data->eqe_dma;
+ qm->aeqe_dma = vf_data->aeqe_dma;
+ qm->sqc_dma = vf_data->sqc_dma;
+ qm->cqc_dma = vf_data->cqc_dma;
+
+ qm->qp_base = vf_data->qp_base;
+ qm->qp_num = vf_data->qp_num;
+
+ ret = qm_rw_regs_write(qm, vf_data);
+ if (ret) {
+ dev_err(dev, "Set VF regs failed\n");
+ return ret;
+ }
+
+ ret = qm_mb(qm, QM_MB_CMD_SQC_BT, qm->sqc_dma, 0, 0);
+ if (ret) {
+ dev_err(dev, "Set sqc failed\n");
+ return ret;
+ }
+
+ ret = qm_mb(qm, QM_MB_CMD_CQC_BT, qm->cqc_dma, 0, 0);
+ if (ret) {
+ dev_err(dev, "Set cqc failed\n");
+ return ret;
+ }
+
+ qm_dev_cmd_init(qm);
+ return 0;
+}
+
+static int vf_qm_state_save(struct hisi_acc_vf_core_device *hisi_acc_vdev,
+ struct hisi_acc_vf_migration_file *migf)
+{
+ struct device *dev = &hisi_acc_vdev->vf_dev->dev;
+ struct hisi_qm *vf_qm = &hisi_acc_vdev->vf_qm;
+ int ret;
+
+ ret = vf_qm_cache_wb(vf_qm);
+ if (ret) {
+ dev_err(dev, "failed to writeback QM Cache!\n");
+ goto state_error;
+ }
+
+ ret = vf_migration_data_store(hisi_acc_vdev, migf);
+ if (ret) {
+ dev_err(dev, "failed to get and store migration data!\n");
+ goto state_error;
+ }
+
+ migf->total_length = sizeof(struct acc_vf_data);
+
+ return 0;
+
+state_error:
+ vf_qm_fun_reset(hisi_acc_vdev, vf_qm);
+ return ret;
+}
+
+static void hisi_acc_vf_start_device(struct hisi_acc_vf_core_device *hisi_acc_vdev)
+{
+ struct hisi_qm *vf_qm = &hisi_acc_vdev->vf_qm;
+
+ vf_qm_fun_reset(hisi_acc_vdev, vf_qm);
+}
+
+static void hisi_acc_vf_disable_fd(struct hisi_acc_vf_migration_file *migf)
+{
+ mutex_lock(&migf->lock);
+ migf->disabled = true;
+ migf->total_length = 0;
+ migf->filp->f_pos = 0;
+ mutex_unlock(&migf->lock);
+}
+
+static int hisi_acc_vf_release_file(struct inode *inode, struct file *filp)
+{
+ struct hisi_acc_vf_migration_file *migf = filp->private_data;
+
+ hisi_acc_vf_disable_fd(migf);
+ mutex_destroy(&migf->lock);
+ kfree(migf);
+ return 0;
+}
+
+static int hisi_acc_vf_match_check(struct hisi_acc_vf_core_device *hisi_acc_vdev)
+{
+ struct acc_vf_data *vf_data = &hisi_acc_vdev->resuming_migf->vf_data;
+ struct hisi_qm *vf_qm = &hisi_acc_vdev->vf_qm;
+ struct hisi_qm *pf_qm = &hisi_acc_vdev->vf_qm;
+ struct device *dev = &vf_qm->pdev->dev;
+ u32 que_iso_state;
+ int ret;
+
+ /* vf acc dev type check */
+ if (vf_data->dev_id != hisi_acc_vdev->vf_dev->device) {
+ dev_err(dev, "failed to match VF devices\n");
+ return -EINVAL;
+ }
+
+ /* vf qp num check */
+ ret = qm_get_vft(vf_qm, &vf_qm->qp_base);
+ if (ret <= 0) {
+ dev_err(dev, "failed to get vft qp nums\n");
+ return -EINVAL;
+ }
+
+ if (ret != vf_data->qp_num) {
+ dev_err(dev, "failed to match VF qp num\n");
+ return -EINVAL;
+ }
+
+ vf_qm->qp_num = ret;
+
+ /* vf isolation state check */
+ ret = qm_read_reg(pf_qm, QM_QUE_ISO_CFG_V, &que_iso_state, 1);
+ if (ret) {
+ dev_err(dev, "failed to read QM_QUE_ISO_CFG_V\n");
+ return ret;
+ }
+
+ if (vf_data->que_iso_cfg != que_iso_state) {
+ dev_err(dev, "failed to match isolation state\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static ssize_t hisi_acc_vf_resume_write(struct file *filp, const char __user *buf,
+ size_t len, loff_t *pos)
+{
+ struct hisi_acc_vf_migration_file *migf = filp->private_data;
+ loff_t requested_length;
+ ssize_t done = 0;
+ int ret;
+
+ if (pos)
+ return -ESPIPE;
+ pos = &filp->f_pos;
+
+ if (*pos < 0 ||
+ check_add_overflow((loff_t)len, *pos, &requested_length))
+ return -EINVAL;
+
+ if (requested_length > HISI_ACC_MIG_REGION_DATA_SIZE)
+ return -ENOMEM;
+
+ mutex_lock(&migf->lock);
+ if (migf->disabled) {
+ done = -ENODEV;
+ goto out_unlock;
+ }
+
+ ret = copy_from_user(&migf->vf_data, buf, len);
+ if (ret) {
+ done = -EFAULT;
+ goto out_unlock;
+ }
+ *pos += len;
+ done = len;
+out_unlock:
+ mutex_unlock(&migf->lock);
+ return done;
+}
+
+static const struct file_operations hisi_acc_vf_resume_fops = {
+ .owner = THIS_MODULE,
+ .write = hisi_acc_vf_resume_write,
+ .release = hisi_acc_vf_release_file,
+ .llseek = no_llseek,
+};
+
+static struct hisi_acc_vf_migration_file *
+hisi_acc_vf_pci_resume(struct hisi_acc_vf_core_device *hisi_acc_vdev)
+{
+ struct hisi_acc_vf_migration_file *migf;
+
+ migf = kzalloc(sizeof(*migf), GFP_KERNEL);
+ if (!migf)
+ return ERR_PTR(-ENOMEM);
+
+ migf->filp = anon_inode_getfile("hisi_acc_vf_mig", &hisi_acc_vf_resume_fops, migf,
+ O_WRONLY);
+ if (IS_ERR(migf->filp)) {
+ int err = PTR_ERR(migf->filp);
+
+ kfree(migf);
+ return ERR_PTR(err);
+ }
+
+ stream_open(migf->filp->f_inode, migf->filp);
+ mutex_init(&migf->lock);
+ return migf;
+}
+
+static ssize_t hisi_acc_vf_save_read(struct file *filp, char __user *buf, size_t len,
+ loff_t *pos)
+{
+ struct hisi_acc_vf_migration_file *migf = filp->private_data;
+ ssize_t done = 0;
+ int ret;
+
+ if (pos)
+ return -ESPIPE;
+ pos = &filp->f_pos;
+
+ mutex_lock(&migf->lock);
+ if (*pos > migf->total_length) {
+ done = -EINVAL;
+ goto out_unlock;
+ }
+
+ if (migf->disabled) {
+ done = -ENODEV;
+ goto out_unlock;
+ }
+
+ len = min_t(size_t, migf->total_length - *pos, len);
+ if (len) {
+ ret = copy_to_user(buf, &migf->vf_data, len);
+ if (ret) {
+ done = -EFAULT;
+ goto out_unlock;
+ }
+ *pos += len;
+ done = len;
+ }
+
+out_unlock:
+ mutex_unlock(&migf->lock);
+ return done;
+}
+
+static const struct file_operations hisi_acc_vf_save_fops = {
+ .owner = THIS_MODULE,
+ .read = hisi_acc_vf_save_read,
+ .release = hisi_acc_vf_release_file,
+ .llseek = no_llseek,
+};
+
+static struct hisi_acc_vf_migration_file *
+hisi_acc_vf_stop_copy(struct hisi_acc_vf_core_device *hisi_acc_vdev)
+{
+ struct hisi_qm *vf_qm = &hisi_acc_vdev->vf_qm;
+ struct device *dev = &hisi_acc_vdev->vf_dev->dev;
+ struct hisi_acc_vf_migration_file *migf;
+ int ret;
+
+ if (unlikely(qm_wait_dev_not_ready(vf_qm))) {
+ dev_info(dev, "QM device not ready, no data to transfer\n");
+ return 0;
+ }
+
+ migf = kzalloc(sizeof(*migf), GFP_KERNEL);
+ if (!migf)
+ return ERR_PTR(-ENOMEM);
+
+ migf->filp = anon_inode_getfile("hisi_acc_vf_mig", &hisi_acc_vf_save_fops, migf,
+ O_RDONLY);
+ if (IS_ERR(migf->filp)) {
+ int err = PTR_ERR(migf->filp);
+
+ kfree(migf);
+ return ERR_PTR(err);
+ }
+
+ stream_open(migf->filp->f_inode, migf->filp);
+ mutex_init(&migf->lock);
+
+ ret = vf_qm_state_save(hisi_acc_vdev, migf);
+ if (ret) {
+ fput(migf->filp);
+ return ERR_PTR(ret);
+ }
+
+ return migf;
+}
+
+static int hisi_acc_vf_load_state(struct hisi_acc_vf_core_device *hisi_acc_vdev)
+{
+ struct device *dev = &hisi_acc_vdev->vf_dev->dev;
+ struct hisi_qm *vf_qm = &hisi_acc_vdev->vf_qm;
+ int ret;
+
+ /* Check dev compatibility */
+ ret = hisi_acc_vf_match_check(hisi_acc_vdev);
+ if (ret) {
+ dev_err(dev, "failed to match the VF!\n");
+ return ret;
+ }
+ /* Recover data to VF */
+ ret = vf_migration_data_recover(hisi_acc_vdev, vf_qm);
+ if (ret) {
+ dev_err(dev, "failed to recover the VF!\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int hisi_acc_vf_stop_device(struct hisi_acc_vf_core_device *hisi_acc_vdev)
+{
+ struct device *dev = &hisi_acc_vdev->vf_dev->dev;
+ struct hisi_qm *vf_qm = &hisi_acc_vdev->vf_qm;
+ int ret;
+
+ ret = vf_qm_func_stop(vf_qm);
+ if (ret) {
+ dev_err(dev, "failed to stop QM VF function!\n");
+ return ret;
+ }
+
+ ret = qm_check_int_state(hisi_acc_vdev);
+ if (ret) {
+ dev_err(dev, "failed to check QM INT state!\n");
+ return ret;
+ }
+ return 0;
+}
+
+static void hisi_acc_vf_disable_fds(struct hisi_acc_vf_core_device *hisi_acc_vdev)
+{
+ if (hisi_acc_vdev->resuming_migf) {
+ hisi_acc_vf_disable_fd(hisi_acc_vdev->resuming_migf);
+ fput(hisi_acc_vdev->resuming_migf->filp);
+ hisi_acc_vdev->resuming_migf = NULL;
+ }
+
+ if (hisi_acc_vdev->saving_migf) {
+ hisi_acc_vf_disable_fd(hisi_acc_vdev->saving_migf);
+ fput(hisi_acc_vdev->saving_migf->filp);
+ hisi_acc_vdev->saving_migf = NULL;
+ }
+}
+
+static struct file *
+hisi_acc_vf_set_device_state(struct hisi_acc_vf_core_device *hisi_acc_vdev,
+ u32 new)
+{
+ u32 cur = hisi_acc_vdev->mig_state;
+ int ret;
+
+ if (cur == VFIO_DEVICE_STATE_RUNNING && new == VFIO_DEVICE_STATE_STOP) {
+ ret = hisi_acc_vf_stop_device(hisi_acc_vdev);
+ if (ret)
+ return ERR_PTR(ret);
+ return NULL;
+ }
+
+ if (cur == VFIO_DEVICE_STATE_STOP && new == VFIO_DEVICE_STATE_STOP_COPY) {
+ struct hisi_acc_vf_migration_file *migf;
+
+ migf = hisi_acc_vf_stop_copy(hisi_acc_vdev);
+ if (IS_ERR(migf))
+ return ERR_CAST(migf);
+ get_file(migf->filp);
+ hisi_acc_vdev->saving_migf = migf;
+ return migf->filp;
+ }
+
+ if ((cur == VFIO_DEVICE_STATE_STOP_COPY && new == VFIO_DEVICE_STATE_STOP)) {
+ hisi_acc_vf_disable_fds(hisi_acc_vdev);
+ return NULL;
+ }
+
+ if (cur == VFIO_DEVICE_STATE_STOP && new == VFIO_DEVICE_STATE_RESUMING) {
+ struct hisi_acc_vf_migration_file *migf;
+
+ migf = hisi_acc_vf_pci_resume(hisi_acc_vdev);
+ if (IS_ERR(migf))
+ return ERR_CAST(migf);
+ get_file(migf->filp);
+ hisi_acc_vdev->resuming_migf = migf;
+ return migf->filp;
+ }
+
+ if (cur == VFIO_DEVICE_STATE_RESUMING && new == VFIO_DEVICE_STATE_STOP) {
+ ret = hisi_acc_vf_load_state(hisi_acc_vdev);
+ if (ret)
+ return ERR_PTR(ret);
+ hisi_acc_vf_disable_fds(hisi_acc_vdev);
+ return NULL;
+ }
+
+ if (cur == VFIO_DEVICE_STATE_STOP && new == VFIO_DEVICE_STATE_RUNNING) {
+ hisi_acc_vf_start_device(hisi_acc_vdev);
+ return NULL;
+ }
+
+ /*
+ * vfio_mig_get_next_state() does not use arcs other than the above
+ */
+ WARN_ON(true);
+ return ERR_PTR(-EINVAL);
+}
+
+static struct file *
+hisi_acc_vfio_pci_set_device_state(struct vfio_device *vdev,
+ enum vfio_device_mig_state new_state)
+{
+ struct hisi_acc_vf_core_device *hisi_acc_vdev = container_of(vdev,
+ struct hisi_acc_vf_core_device, core_device.vdev);
+ enum vfio_device_mig_state next_state;
+ struct file *res = NULL;
+ int ret;
+
+ mutex_lock(&hisi_acc_vdev->state_mutex);
+ while (new_state != hisi_acc_vdev->mig_state) {
+ ret = vfio_mig_get_next_state(vdev,
+ hisi_acc_vdev->mig_state,
+ new_state, &next_state);
+ if (ret) {
+ res = ERR_PTR(-EINVAL);
+ break;
+ }
+
+ res = hisi_acc_vf_set_device_state(hisi_acc_vdev, next_state);
+ if (IS_ERR(res))
+ break;
+ hisi_acc_vdev->mig_state = next_state;
+ if (WARN_ON(res && new_state != hisi_acc_vdev->mig_state)) {
+ fput(res);
+ res = ERR_PTR(-EINVAL);
+ break;
+ }
+ }
+ mutex_unlock(&hisi_acc_vdev->state_mutex);
+ return res;
+}
+
+static int
+hisi_acc_vfio_pci_get_device_state(struct vfio_device *vdev,
+ enum vfio_device_mig_state *curr_state)
+{
+ struct hisi_acc_vf_core_device *hisi_acc_vdev = container_of(vdev,
+ struct hisi_acc_vf_core_device, core_device.vdev);
+
+ mutex_lock(&hisi_acc_vdev->state_mutex);
+ *curr_state = hisi_acc_vdev->mig_state;
+ mutex_unlock(&hisi_acc_vdev->state_mutex);
+ return 0;
+}
+
+static int hisi_acc_vfio_pci_init(struct hisi_acc_vf_core_device *hisi_acc_vdev)
+{
+ struct vfio_pci_core_device *vdev = &hisi_acc_vdev->core_device;
+ struct pci_dev *vf_dev = vdev->pdev;
+ struct hisi_qm *vf_qm = &hisi_acc_vdev->vf_qm;
+
+ /*
+ * ACC VF dev BAR2 region consists of both functional register space
+ * and migration control register space. For migration to work, we
+ * need access to both. Hence, we map the entire BAR2 region here.
+ * But from a security point of view, we restrict access to the
+ * migration control space from Guest(Please see mmap/ioctl/read/write
+ * override functions).
+ *
+ * Also the HiSilicon ACC VF devices supported by this driver on
+ * HiSilicon hardware platforms are integrated end point devices
+ * and has no capability to perform PCIe P2P.
+ */
+ vf_qm->io_base =
+ ioremap(pci_resource_start(vf_dev, VFIO_PCI_BAR2_REGION_INDEX),
+ pci_resource_len(vf_dev, VFIO_PCI_BAR2_REGION_INDEX));
+ if (!vf_qm->io_base)
+ return -EIO;
+
+ vf_qm->fun_type = QM_HW_VF;
+ vf_qm->pdev = vf_dev;
+ mutex_init(&vf_qm->mailbox_lock);
+
+ hisi_acc_vdev->vf_id = PCI_FUNC(vf_dev->devfn);
+ hisi_acc_vdev->vf_dev = vf_dev;
+ vf_qm->dev_name = hisi_acc_vdev->pf_qm->dev_name;
+
+ hisi_acc_vdev->mig_state = VFIO_DEVICE_STATE_RUNNING;
+
+ return 0;
+}
static int hisi_acc_pci_rw_access_check(struct vfio_device *core_vdev,
size_t count, loff_t *ppos,
@@ -129,63 +1067,96 @@ static long hisi_acc_vfio_pci_ioctl(struct vfio_device *core_vdev, unsigned int
static int hisi_acc_vfio_pci_open_device(struct vfio_device *core_vdev)
{
- struct vfio_pci_core_device *vdev =
- container_of(core_vdev, struct vfio_pci_core_device, vdev);
+ struct hisi_acc_vf_core_device *hisi_acc_vdev = container_of(core_vdev,
+ struct hisi_acc_vf_core_device, core_device.vdev);
+ struct vfio_pci_core_device *vdev = &hisi_acc_vdev->core_device;
int ret;
ret = vfio_pci_core_enable(vdev);
if (ret)
return ret;
- vfio_pci_core_finish_enable(vdev);
+ if (!hisi_acc_vdev->migration_support) {
+ vfio_pci_core_finish_enable(vdev);
+ return 0;
+ }
+ ret = hisi_acc_vfio_pci_init(hisi_acc_vdev);
+ if (ret) {
+ vfio_pci_core_disable(vdev);
+ return ret;
+ }
+ vfio_pci_core_finish_enable(vdev);
return 0;
}
+static void hisi_acc_vfio_pci_close_device(struct vfio_device *core_vdev)
+{
+ struct hisi_acc_vf_core_device *hisi_acc_vdev = container_of(core_vdev,
+ struct hisi_acc_vf_core_device, core_device.vdev);
+ struct hisi_qm *vf_qm = &hisi_acc_vdev->vf_qm;
+
+ iounmap(vf_qm->io_base);
+ vfio_pci_core_close_device(core_vdev);
+}
+
static const struct vfio_device_ops hisi_acc_vfio_pci_ops = {
.name = "hisi-acc-vfio-pci",
.open_device = hisi_acc_vfio_pci_open_device,
- .close_device = vfio_pci_core_close_device,
+ .close_device = hisi_acc_vfio_pci_close_device,
.ioctl = hisi_acc_vfio_pci_ioctl,
+ .device_feature = vfio_pci_core_ioctl_feature,
.read = hisi_acc_vfio_pci_read,
.write = hisi_acc_vfio_pci_write,
.mmap = hisi_acc_vfio_pci_mmap,
.request = vfio_pci_core_request,
.match = vfio_pci_core_match,
+ .migration_set_state = hisi_acc_vfio_pci_set_device_state,
+ .migration_get_state = hisi_acc_vfio_pci_get_device_state,
};
static int hisi_acc_vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
- struct vfio_pci_core_device *vdev;
+ struct hisi_acc_vf_core_device *hisi_acc_vdev;
+ struct hisi_qm *pf_qm;
int ret;
- vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
- if (!vdev)
+ hisi_acc_vdev = kzalloc(sizeof(*hisi_acc_vdev), GFP_KERNEL);
+ if (!hisi_acc_vdev)
return -ENOMEM;
- vfio_pci_core_init_device(vdev, pdev, &hisi_acc_vfio_pci_ops);
+ vfio_pci_core_init_device(&hisi_acc_vdev->core_device, pdev,
+ &hisi_acc_vfio_pci_ops);
- ret = vfio_pci_core_register_device(vdev);
+ pf_qm = hisi_qm_get_pf_qm(pdev);
+ if (pf_qm && pf_qm->ver >= QM_HW_V3) {
+ hisi_acc_vdev->migration_support = 1;
+ hisi_acc_vdev->core_device.vdev.migration_flags =
+ VFIO_MIGRATION_STOP_COPY;
+ hisi_acc_vdev->pf_qm = pf_qm;
+ mutex_init(&hisi_acc_vdev->state_mutex);
+ }
+
+ ret = vfio_pci_core_register_device(&hisi_acc_vdev->core_device);
if (ret)
goto out_free;
- dev_set_drvdata(&pdev->dev, vdev);
-
+ dev_set_drvdata(&pdev->dev, hisi_acc_vdev);
return 0;
out_free:
- vfio_pci_core_uninit_device(vdev);
- kfree(vdev);
+ vfio_pci_core_uninit_device(&hisi_acc_vdev->core_device);
+ kfree(hisi_acc_vdev);
return ret;
}
static void hisi_acc_vfio_pci_remove(struct pci_dev *pdev)
{
- struct vfio_pci_core_device *vdev = dev_get_drvdata(&pdev->dev);
+ struct hisi_acc_vf_core_device *hisi_acc_vdev = dev_get_drvdata(&pdev->dev);
- vfio_pci_core_unregister_device(vdev);
- vfio_pci_core_uninit_device(vdev);
- kfree(vdev);
+ vfio_pci_core_unregister_device(&hisi_acc_vdev->core_device);
+ vfio_pci_core_uninit_device(&hisi_acc_vdev->core_device);
+ kfree(hisi_acc_vdev);
}
static const struct pci_device_id hisi_acc_vfio_pci_table[] = {
@@ -210,4 +1181,4 @@ module_pci_driver(hisi_acc_vfio_pci_driver);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Liu Longfang <liulongfang@xxxxxxxxxx>");
MODULE_AUTHOR("Shameer Kolothum <shameerali.kolothum.thodi@xxxxxxxxxx>");
-MODULE_DESCRIPTION("HiSilicon VFIO PCI - Generic VFIO PCI driver for HiSilicon ACC device family");
+MODULE_DESCRIPTION("HiSilicon VFIO PCI - VFIO PCI driver with live migration support for HiSilicon ACC device family");
diff --git a/drivers/vfio/pci/hisi_acc_vfio_pci.h b/drivers/vfio/pci/hisi_acc_vfio_pci.h
new file mode 100644
index 000000000000..ea87e0985d8d
--- /dev/null
+++ b/drivers/vfio/pci/hisi_acc_vfio_pci.h
@@ -0,0 +1,119 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (c) 2021 HiSilicon Ltd. */
+
+#ifndef HISI_ACC_VFIO_PCI_H
+#define HISI_ACC_VFIO_PCI_H
+
+#include <linux/hisi_acc_qm.h>
+
+#define VDM_OFFSET(x) offsetof(struct vfio_device_migration_info, x)
+
+#define HISI_ACC_MIG_REGION_DATA_OFFSET \
+ (sizeof(struct vfio_device_migration_info))
+
+#define HISI_ACC_MIG_REGION_DATA_SIZE (sizeof(struct acc_vf_data))
+
+#define MB_POLL_PERIOD_US 10
+#define MB_POLL_TIMEOUT_US 1000
+#define QM_CACHE_WB_START 0x204
+#define QM_CACHE_WB_DONE 0x208
+#define QM_MB_CMD_PAUSE_QM 0xe
+#define QM_ABNORMAL_INT_STATUS 0x100008
+#define QM_IFC_INT_STATUS 0x0028
+#define SEC_CORE_INT_STATUS 0x301008
+#define HPRE_HAC_INT_STATUS 0x301800
+#define HZIP_CORE_INT_STATUS 0x3010AC
+#define QM_QUE_ISO_CFG 0x301154
+
+#define QM_VFT_CFG_RDY 0x10006c
+#define QM_VFT_CFG_OP_WR 0x100058
+#define QM_VFT_CFG_TYPE 0x10005c
+#define QM_VFT_CFG 0x100060
+#define QM_VFT_CFG_OP_ENABLE 0x100054
+#define QM_VFT_CFG_DATA_L 0x100064
+#define QM_VFT_CFG_DATA_H 0x100068
+
+#define ERROR_CHECK_TIMEOUT 100
+#define CHECK_DELAY_TIME 100
+
+#define QM_SQC_VFT_BASE_SHIFT_V2 28
+#define QM_SQC_VFT_BASE_MASK_V2 GENMASK(15, 0)
+#define QM_SQC_VFT_NUM_SHIFT_V2 45
+#define QM_SQC_VFT_NUM_MASK_V2 GENMASK(9, 0)
+
+/* RW regs */
+#define QM_REGS_MAX_LEN 7
+#define QM_REG_ADDR_OFFSET 0x0004
+
+#define QM_XQC_ADDR_OFFSET 32U
+#define QM_VF_AEQ_INT_MASK 0x0004
+#define QM_VF_EQ_INT_MASK 0x000c
+#define QM_IFC_INT_SOURCE_V 0x0020
+#define QM_IFC_INT_MASK 0x0024
+#define QM_IFC_INT_SET_V 0x002c
+#define QM_QUE_ISO_CFG_V 0x0030
+#define QM_PAGE_SIZE 0x0034
+#define QM_VF_STATE 0x0060
+
+#define QM_EQC_DW0 0X8000
+#define QM_AEQC_DW0 0X8020
+
+struct acc_vf_data {
+#define QM_MATCH_SIZE 32L
+ /* QM match information */
+ u32 qp_num;
+ u32 dev_id;
+ u32 que_iso_cfg;
+ u32 qp_base;
+ /* QM reserved 4 match information */
+ u32 qm_rsv_state[4];
+
+ /* QM RW regs */
+ u32 aeq_int_mask;
+ u32 eq_int_mask;
+ u32 ifc_int_source;
+ u32 ifc_int_mask;
+ u32 ifc_int_set;
+ u32 page_size;
+
+ /* QM_EQC_DW has 7 regs */
+ u32 qm_eqc_dw[7];
+
+ /* QM_AEQC_DW has 7 regs */
+ u32 qm_aeqc_dw[7];
+
+ /* QM reserved 5 regs */
+ u32 qm_rsv_regs[5];
+
+ /* qm memory init information */
+ dma_addr_t eqe_dma;
+ dma_addr_t aeqe_dma;
+ dma_addr_t sqc_dma;
+ dma_addr_t cqc_dma;
+};
+
+struct hisi_acc_vf_migration_file {
+ struct file *filp;
+ struct mutex lock;
+ bool disabled;
+
+ struct acc_vf_data vf_data;
+ size_t total_length;
+};
+
+struct hisi_acc_vf_core_device {
+ struct vfio_pci_core_device core_device;
+ u8 migration_support:1;
+ /* for migration state */
+ struct mutex state_mutex;
+ enum vfio_device_mig_state mig_state;
+ struct pci_dev *pf_dev;
+ struct pci_dev *vf_dev;
+ struct hisi_qm *pf_qm;
+ struct hisi_qm vf_qm;
+ int vf_id;
+
+ struct hisi_acc_vf_migration_file *resuming_migf;
+ struct hisi_acc_vf_migration_file *saving_migf;
+};
+#endif /* HISI_ACC_VFIO_PCI_H */
--
2.17.1