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    Subject[PATCH RFC v2 08/18] dmaengine: idxd: add device support functions in prep for mdev
    From
    Date
    Add device support helper functions in preparation of adding VFIO
    mdev support.

    Signed-off-by: Dave Jiang <dave.jiang@intel.com>
    Reviewed-by: Kevin Tian <kevin.tian@intel.com>
    ---
    drivers/dma/idxd/device.c | 61 +++++++++++++++++++++++++++++++++++++++++++++
    drivers/dma/idxd/idxd.h | 4 +++
    2 files changed, 65 insertions(+)

    diff --git a/drivers/dma/idxd/device.c b/drivers/dma/idxd/device.c
    index 2b4e8ab99ebd..7443ffb5d3c3 100644
    --- a/drivers/dma/idxd/device.c
    +++ b/drivers/dma/idxd/device.c
    @@ -287,6 +287,30 @@ void idxd_wq_unmap_portal(struct idxd_wq *wq)
    devm_iounmap(dev, wq->portal);
    }

    +int idxd_wq_abort(struct idxd_wq *wq)
    +{
    + struct idxd_device *idxd = wq->idxd;
    + struct device *dev = &idxd->pdev->dev;
    + u32 operand, status;
    +
    + dev_dbg(dev, "Abort WQ %d\n", wq->id);
    + if (wq->state != IDXD_WQ_ENABLED) {
    + dev_dbg(dev, "WQ %d not active\n", wq->id);
    + return -ENXIO;
    + }
    +
    + operand = BIT(wq->id % 16) | ((wq->id / 16) << 16);
    + dev_dbg(dev, "cmd: %u operand: %#x\n", IDXD_CMD_ABORT_WQ, operand);
    + idxd_cmd_exec(idxd, IDXD_CMD_ABORT_WQ, operand, &status);
    + if (status != IDXD_CMDSTS_SUCCESS) {
    + dev_dbg(dev, "WQ abort failed: %#x\n", status);
    + return -ENXIO;
    + }
    +
    + dev_dbg(dev, "WQ %d aborted\n", wq->id);
    + return 0;
    +}
    +
    int idxd_wq_set_pasid(struct idxd_wq *wq, int pasid)
    {
    struct idxd_device *idxd = wq->idxd;
    @@ -366,6 +390,32 @@ void idxd_wq_disable_cleanup(struct idxd_wq *wq)
    }
    }

    +void idxd_wq_setup_pasid(struct idxd_wq *wq, int pasid)
    +{
    + struct idxd_device *idxd = wq->idxd;
    + int offset;
    +
    + lockdep_assert_held(&idxd->dev_lock);
    +
    + /* PASID fields are 8 bytes into the WQCFG register */
    + offset = idxd->wqcfg_offset + wq->id * 32 + 8;
    + wq->wqcfg.pasid = pasid;
    + iowrite32(wq->wqcfg.bits[2], idxd->reg_base + offset);
    +}
    +
    +void idxd_wq_setup_priv(struct idxd_wq *wq, int priv)
    +{
    + struct idxd_device *idxd = wq->idxd;
    + int offset;
    +
    + lockdep_assert_held(&idxd->dev_lock);
    +
    + /* priv field is 8 bytes into the WQCFG register */
    + offset = idxd->wqcfg_offset + wq->id * 32 + 8;
    + wq->wqcfg.priv = !!priv;
    + iowrite32(wq->wqcfg.bits[2], idxd->reg_base + offset);
    +}
    +
    /* Device control bits */
    static inline bool idxd_is_enabled(struct idxd_device *idxd)
    {
    @@ -502,6 +552,17 @@ void idxd_device_drain_pasid(struct idxd_device *idxd, int pasid)
    dev_dbg(dev, "pasid %d drained\n", pasid);
    }

    +void idxd_device_abort_pasid(struct idxd_device *idxd, int pasid)
    +{
    + struct device *dev = &idxd->pdev->dev;
    + u32 operand;
    +
    + operand = pasid;
    + dev_dbg(dev, "cmd: %u operand: %#x\n", IDXD_CMD_ABORT_PASID, operand);
    + idxd_cmd_exec(idxd, IDXD_CMD_ABORT_PASID, operand, NULL);
    + dev_dbg(dev, "pasid %d aborted\n", pasid);
    +}
    +
    #define INT_HANDLE_IMS_TABLE 0x10000
    int idxd_device_request_int_handle(struct idxd_device *idxd, int idx,
    int *handle, enum idxd_interrupt_type irq_type)
    diff --git a/drivers/dma/idxd/idxd.h b/drivers/dma/idxd/idxd.h
    index c65fb6dcb7e0..438d6478a3f8 100644
    --- a/drivers/dma/idxd/idxd.h
    +++ b/drivers/dma/idxd/idxd.h
    @@ -321,6 +321,7 @@ void idxd_device_cleanup(struct idxd_device *idxd);
    int idxd_device_config(struct idxd_device *idxd);
    void idxd_device_wqs_clear_state(struct idxd_device *idxd);
    void idxd_device_drain_pasid(struct idxd_device *idxd, int pasid);
    +void idxd_device_abort_pasid(struct idxd_device *idxd, int pasid);
    int idxd_device_load_config(struct idxd_device *idxd);
    int idxd_device_request_int_handle(struct idxd_device *idxd, int idx, int *handle,
    enum idxd_interrupt_type irq_type);
    @@ -336,6 +337,9 @@ void idxd_wq_unmap_portal(struct idxd_wq *wq);
    void idxd_wq_disable_cleanup(struct idxd_wq *wq);
    int idxd_wq_set_pasid(struct idxd_wq *wq, int pasid);
    int idxd_wq_disable_pasid(struct idxd_wq *wq);
    +int idxd_wq_abort(struct idxd_wq *wq);
    +void idxd_wq_setup_pasid(struct idxd_wq *wq, int pasid);
    +void idxd_wq_setup_priv(struct idxd_wq *wq, int priv);

    /* submission */
    int idxd_submit_desc(struct idxd_wq *wq, struct idxd_desc *desc);
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