[PATCH] hw/nvme: use stl/ldl pci dma api

[Klaus Jensen <its@irrelevant.dk>]

From: Klaus Jensen <k.jensen@samsung.com>

Use the stl/ldl pci dma api for writing/reading doorbells. This removes
the explicit endian conversions.

Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
---
 hw/nvme/ctrl.c | 42 +++++++++++++-----------------------------
 1 file changed, 13 insertions(+), 29 deletions(-)

diff --git a/hw/nvme/ctrl.c b/hw/nvme/ctrl.c
index dadc2dc7da10..f2e5a2fa737b 100644
--- a/hw/nvme/ctrl.c
+++ b/hw/nvme/ctrl.c
@@ -1468,20 +1468,16 @@ static inline void nvme_blk_write(BlockBackend *blk, int64_t offset,
 
 static void nvme_update_cq_eventidx(const NvmeCQueue *cq)
 {
-    uint32_t v = cpu_to_le32(cq->head);
-
     trace_pci_nvme_update_cq_eventidx(cq->cqid, cq->head);
 
-    pci_dma_write(PCI_DEVICE(cq->ctrl), cq->ei_addr, &v, sizeof(v));
+    stl_le_pci_dma(PCI_DEVICE(cq->ctrl), cq->ei_addr, cq->head,
+                   MEMTXATTRS_UNSPECIFIED);
 }
 
 static void nvme_update_cq_head(NvmeCQueue *cq)
 {
-    uint32_t v;
-
-    pci_dma_read(PCI_DEVICE(cq->ctrl), cq->db_addr, &v, sizeof(v));
-
-    cq->head = le32_to_cpu(v);
+    ldl_le_pci_dma(PCI_DEVICE(cq->ctrl), cq->db_addr, &cq->head,
+                   MEMTXATTRS_UNSPECIFIED);
 
     trace_pci_nvme_update_cq_head(cq->cqid, cq->head);
 }
@@ -6801,7 +6797,6 @@ static uint16_t nvme_dbbuf_config(NvmeCtrl *n, const NvmeRequest *req)
     PCIDevice *pci = PCI_DEVICE(n);
     uint64_t dbs_addr = le64_to_cpu(req->cmd.dptr.prp1);
     uint64_t eis_addr = le64_to_cpu(req->cmd.dptr.prp2);
-    uint32_t v;
     int i;
 
     /* Address should be page aligned */
@@ -6819,8 +6814,6 @@ static uint16_t nvme_dbbuf_config(NvmeCtrl *n, const NvmeRequest *req)
         NvmeCQueue *cq = n->cq[i];
 
         if (sq) {
-            v = cpu_to_le32(sq->tail);
-
             /*
              * CAP.DSTRD is 0, so offset of ith sq db_addr is (i<<3)
              * nvme_process_db() uses this hard-coded way to calculate
@@ -6828,7 +6821,7 @@ static uint16_t nvme_dbbuf_config(NvmeCtrl *n, const NvmeRequest *req)
              */
             sq->db_addr = dbs_addr + (i << 3);
             sq->ei_addr = eis_addr + (i << 3);
-            pci_dma_write(pci, sq->db_addr, &v, sizeof(sq->tail));
+            stl_le_pci_dma(pci, sq->db_addr, sq->tail, MEMTXATTRS_UNSPECIFIED);
 
             if (n->params.ioeventfd && sq->sqid != 0) {
                 if (!nvme_init_sq_ioeventfd(sq)) {
@@ -6838,12 +6831,10 @@ static uint16_t nvme_dbbuf_config(NvmeCtrl *n, const NvmeRequest *req)
         }
 
         if (cq) {
-            v = cpu_to_le32(cq->head);
-
             /* CAP.DSTRD is 0, so offset of ith cq db_addr is (i<<3)+(1<<2) */
             cq->db_addr = dbs_addr + (i << 3) + (1 << 2);
             cq->ei_addr = eis_addr + (i << 3) + (1 << 2);
-            pci_dma_write(pci, cq->db_addr, &v, sizeof(cq->head));
+            stl_le_pci_dma(pci, cq->db_addr, cq->head, MEMTXATTRS_UNSPECIFIED);
 
             if (n->params.ioeventfd && cq->cqid != 0) {
                 if (!nvme_init_cq_ioeventfd(cq)) {
@@ -6974,20 +6965,16 @@ static uint16_t nvme_admin_cmd(NvmeCtrl *n, NvmeRequest *req)
 
 static void nvme_update_sq_eventidx(const NvmeSQueue *sq)
 {
-    uint32_t v = cpu_to_le32(sq->tail);
-
     trace_pci_nvme_update_sq_eventidx(sq->sqid, sq->tail);
 
-    pci_dma_write(PCI_DEVICE(sq->ctrl), sq->ei_addr, &v, sizeof(v));
+    stl_le_pci_dma(PCI_DEVICE(sq->ctrl), sq->ei_addr, sq->tail,
+                   MEMTXATTRS_UNSPECIFIED);
 }
 
 static void nvme_update_sq_tail(NvmeSQueue *sq)
 {
-    uint32_t v;
-
-    pci_dma_read(PCI_DEVICE(sq->ctrl), sq->db_addr, &v, sizeof(v));
-
-    sq->tail = le32_to_cpu(v);
+    ldl_le_pci_dma(PCI_DEVICE(sq->ctrl), sq->db_addr, &sq->tail,
+                   MEMTXATTRS_UNSPECIFIED);
 
     trace_pci_nvme_update_sq_tail(sq->sqid, sq->tail);
 }
@@ -7592,7 +7579,7 @@ static uint64_t nvme_mmio_read(void *opaque, hwaddr addr, unsigned size)
 static void nvme_process_db(NvmeCtrl *n, hwaddr addr, int val)
 {
     PCIDevice *pci = PCI_DEVICE(n);
-    uint32_t qid, v;
+    uint32_t qid;
 
     if (unlikely(addr & ((1 << 2) - 1))) {
         NVME_GUEST_ERR(pci_nvme_ub_db_wr_misaligned,
@@ -7659,8 +7646,7 @@ static void nvme_process_db(NvmeCtrl *n, hwaddr addr, int val)
         start_sqs = nvme_cq_full(cq) ? 1 : 0;
         cq->head = new_head;
         if (!qid && n->dbbuf_enabled) {
-            v = cpu_to_le32(cq->head);
-            pci_dma_write(pci, cq->db_addr, &v, sizeof(cq->head));
+            stl_le_pci_dma(pci, cq->db_addr, cq->head, MEMTXATTRS_UNSPECIFIED);
         }
         if (start_sqs) {
             NvmeSQueue *sq;
@@ -7720,8 +7706,6 @@ static void nvme_process_db(NvmeCtrl *n, hwaddr addr, int val)
 
         sq->tail = new_tail;
         if (!qid && n->dbbuf_enabled) {
-            v = cpu_to_le32(sq->tail);
-
             /*
              * The spec states "the host shall also update the controller's
              * corresponding doorbell property to match the value of that entry
@@ -7735,7 +7719,7 @@ static void nvme_process_db(NvmeCtrl *n, hwaddr addr, int val)
              * including ones that run on Linux, are not updating Admin Queues,
              * so we can't trust reading it for an appropriate sq tail.
              */
-            pci_dma_write(pci, sq->db_addr, &v, sizeof(sq->tail));
+            stl_le_pci_dma(pci, sq->db_addr, sq->tail, MEMTXATTRS_UNSPECIFIED);
         }
 
         qemu_bh_schedule(sq->bh);
-- 
2.41.0