From: Wenkai Lin linwenkai6@hisilicon.com
mainline inclusion from mainline-master commit d18344c0d095df544bd7174b8fae2cba523dd4a4 category: feature bugzilla: 173981 CVE: NA
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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This patch adds a function hisi_qm_is_q_updated to check if the task is ready in hardware queue when user polls an UACCE queue.This prevents users from repeatedly querying whether the accelerator has completed tasks, which wastes CPU resources.
Signed-off-by: Wenkai Lin linwenkai6@hisilicon.com Signed-off-by: Herbert Xu herbert@gondor.apana.org.au Signed-off-by: Mingqiang Ling lingmingqiang@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- drivers/crypto/hisilicon/qm.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+)
diff --git a/drivers/crypto/hisilicon/qm.c b/drivers/crypto/hisilicon/qm.c index 580709408cfc..1d67f94a1d56 100644 --- a/drivers/crypto/hisilicon/qm.c +++ b/drivers/crypto/hisilicon/qm.c @@ -2926,6 +2926,23 @@ static void hisi_qm_uacce_stop_queue(struct uacce_queue *q) hisi_qm_stop_qp(q->priv); }
+static int hisi_qm_is_q_updated(struct uacce_queue *q) +{ + struct hisi_qp *qp = q->priv; + struct qm_cqe *cqe = qp->cqe + qp->qp_status.cq_head; + int updated = 0; + + while (QM_CQE_PHASE(cqe) == qp->qp_status.cqc_phase) { + /* make sure to read data from memory */ + dma_rmb(); + qm_cq_head_update(qp); + cqe = qp->cqe + qp->qp_status.cq_head; + updated = 1; + } + + return updated; +} + static void qm_set_sqctype(struct uacce_queue *q, u16 type) { struct hisi_qm *qm = q->uacce->priv; @@ -2971,6 +2988,7 @@ static const struct uacce_ops uacce_qm_ops = { .stop_queue = hisi_qm_uacce_stop_queue, .mmap = hisi_qm_uacce_mmap, .ioctl = hisi_qm_uacce_ioctl, + .is_q_updated = hisi_qm_is_q_updated, };
static int qm_alloc_uacce(struct hisi_qm *qm)