crypto: hisilicon/qm - alloc buffer to set and get xqc

If the temporarily applied memory is used to set or get the xqc
information, the driver releases the memory immediately after the
hardware mailbox operation time exceeds the driver waiting time.
However, the hardware does not cancel the operation, so the hardware
may write data to released memory.

Therefore, when the driver is bound to a device, the driver reserves
memory for the xqc configuration. The subsequent xqc configuration
uses the reserved memory to prevent hardware from accessing the
released memory.

Signed-off-by: Weili Qian <qianweili@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/hisilicon/debugfs.c

@@ -137,8 +137,8 @@ static void dump_show(struct hisi_qm *qm, void *info,
 static int qm_sqc_dump(struct hisi_qm *qm, char *s, char *name)
 {
 	struct device *dev = &qm->pdev->dev;
-	struct qm_sqc *sqc, *sqc_curr;
-	dma_addr_t sqc_dma;
+	struct qm_sqc *sqc_curr;
+	struct qm_sqc sqc;
 	u32 qp_id;
 	int ret;
 
@@ -151,35 +151,29 @@ static int qm_sqc_dump(struct hisi_qm *qm, char *s, char *name)
 		return -EINVAL;
 	}
 
-	sqc = hisi_qm_ctx_alloc(qm, sizeof(*sqc), &sqc_dma);
-	if (IS_ERR(sqc))
-		return PTR_ERR(sqc);
+	ret = qm_set_and_get_xqc(qm, QM_MB_CMD_SQC, &sqc, qp_id, 1);
+	if (!ret) {
+		dump_show(qm, &sqc, sizeof(struct qm_sqc), name);
 
-	ret = hisi_qm_mb(qm, QM_MB_CMD_SQC, sqc_dma, qp_id, 1);
-	if (ret) {
-		down_read(&qm->qps_lock);
-		if (qm->sqc) {
-			sqc_curr = qm->sqc + qp_id;
+		return 0;
+	}
 
-			dump_show(qm, sqc_curr, sizeof(*sqc), "SOFT SQC");
-		}
-		up_read(&qm->qps_lock);
+	down_read(&qm->qps_lock);
+	if (qm->sqc) {
+		sqc_curr = qm->sqc + qp_id;
 
-		goto free_ctx;
+		dump_show(qm, sqc_curr, sizeof(*sqc_curr), "SOFT SQC");
 	}
+	up_read(&qm->qps_lock);
 
-	dump_show(qm, sqc, sizeof(*sqc), name);
-
-free_ctx:
-	hisi_qm_ctx_free(qm, sizeof(*sqc), sqc, &sqc_dma);
 	return 0;
 }
 
 static int qm_cqc_dump(struct hisi_qm *qm, char *s, char *name)
 {
 	struct device *dev = &qm->pdev->dev;
-	struct qm_cqc *cqc, *cqc_curr;
-	dma_addr_t cqc_dma;
+	struct qm_cqc *cqc_curr;
+	struct qm_cqc cqc;
 	u32 qp_id;
 	int ret;
 
@@ -192,34 +186,29 @@ static int qm_cqc_dump(struct hisi_qm *qm, char *s, char *name)
 		return -EINVAL;
 	}
 
-	cqc = hisi_qm_ctx_alloc(qm, sizeof(*cqc), &cqc_dma);
-	if (IS_ERR(cqc))
-		return PTR_ERR(cqc);
+	ret = qm_set_and_get_xqc(qm, QM_MB_CMD_CQC, &cqc, qp_id, 1);
+	if (!ret) {
+		dump_show(qm, &cqc, sizeof(struct qm_cqc), name);
 
-	ret = hisi_qm_mb(qm, QM_MB_CMD_CQC, cqc_dma, qp_id, 1);
-	if (ret) {
-		down_read(&qm->qps_lock);
-		if (qm->cqc) {
-			cqc_curr = qm->cqc + qp_id;
+		return 0;
+	}
 
-			dump_show(qm, cqc_curr, sizeof(*cqc), "SOFT CQC");
-		}
-		up_read(&qm->qps_lock);
+	down_read(&qm->qps_lock);
+	if (qm->cqc) {
+		cqc_curr = qm->cqc + qp_id;
 
-		goto free_ctx;
+		dump_show(qm, cqc_curr, sizeof(*cqc_curr), "SOFT CQC");
 	}
+	up_read(&qm->qps_lock);
 
-	dump_show(qm, cqc, sizeof(*cqc), name);
-
-free_ctx:
-	hisi_qm_ctx_free(qm, sizeof(*cqc), cqc, &cqc_dma);
 	return 0;
 }
 
 static int qm_eqc_aeqc_dump(struct hisi_qm *qm, char *s, char *name)
 {
 	struct device *dev = &qm->pdev->dev;
-	dma_addr_t xeqc_dma;
+	struct qm_aeqc aeqc;
+	struct qm_eqc eqc;
 	size_t size;
 	void *xeqc;
 	int ret;
@@ -233,23 +222,19 @@ static int qm_eqc_aeqc_dump(struct hisi_qm *qm, char *s, char *name)
 	if (!strcmp(name, "EQC")) {
 		cmd = QM_MB_CMD_EQC;
 		size = sizeof(struct qm_eqc);
+		xeqc = &eqc;
 	} else {
 		cmd = QM_MB_CMD_AEQC;
 		size = sizeof(struct qm_aeqc);
+		xeqc = &aeqc;
 	}
 
-	xeqc = hisi_qm_ctx_alloc(qm, size, &xeqc_dma);
-	if (IS_ERR(xeqc))
-		return PTR_ERR(xeqc);
-
-	ret = hisi_qm_mb(qm, cmd, xeqc_dma, 0, 1);
+	ret = qm_set_and_get_xqc(qm, cmd, xeqc, 0, 1);
 	if (ret)
-		goto err_free_ctx;
+		return ret;
 
 	dump_show(qm, xeqc, size, name);
 
-err_free_ctx:
-	hisi_qm_ctx_free(qm, size, xeqc, &xeqc_dma);
 	return ret;
 }