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[PATCH 17/17] hw/block/nvme: use preallocated qsg/iov in nvme_dma_prp
From: |
Klaus Jensen |
Subject: |
[PATCH 17/17] hw/block/nvme: use preallocated qsg/iov in nvme_dma_prp |
Date: |
Mon, 29 Jun 2020 21:50:17 +0200 |
From: Klaus Jensen <k.jensen@samsung.com>
Since clean up of the request qsg/iov is now always done post-use, there
is no need to use a stack-allocated qsg/iov in nvme_dma_prp.
Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
Acked-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
---
hw/block/nvme.c | 18 ++++++------------
1 file changed, 6 insertions(+), 12 deletions(-)
diff --git a/hw/block/nvme.c b/hw/block/nvme.c
index ec08841f74b6..fa0f8e802d9b 100644
--- a/hw/block/nvme.c
+++ b/hw/block/nvme.c
@@ -350,45 +350,39 @@ static uint16_t nvme_dma_prp(NvmeCtrl *n, uint8_t *ptr,
uint32_t len,
uint64_t prp1, uint64_t prp2, DMADirection dir,
NvmeRequest *req)
{
- QEMUSGList qsg;
- QEMUIOVector iov;
uint16_t status = NVME_SUCCESS;
- status = nvme_map_prp(n, &qsg, &iov, prp1, prp2, len, req);
+ status = nvme_map_prp(n, &req->qsg, &req->iov, prp1, prp2, len, req);
if (status) {
return status;
}
- if (qsg.nsg > 0) {
+ if (req->qsg.nsg > 0) {
uint64_t residual;
if (dir == DMA_DIRECTION_TO_DEVICE) {
- residual = dma_buf_write(ptr, len, &qsg);
+ residual = dma_buf_write(ptr, len, &req->qsg);
} else {
- residual = dma_buf_read(ptr, len, &qsg);
+ residual = dma_buf_read(ptr, len, &req->qsg);
}
if (unlikely(residual)) {
trace_pci_nvme_err_invalid_dma();
status = NVME_INVALID_FIELD | NVME_DNR;
}
-
- qemu_sglist_destroy(&qsg);
} else {
size_t bytes;
if (dir == DMA_DIRECTION_TO_DEVICE) {
- bytes = qemu_iovec_to_buf(&iov, 0, ptr, len);
+ bytes = qemu_iovec_to_buf(&req->iov, 0, ptr, len);
} else {
- bytes = qemu_iovec_from_buf(&iov, 0, ptr, len);
+ bytes = qemu_iovec_from_buf(&req->iov, 0, ptr, len);
}
if (unlikely(bytes != len)) {
trace_pci_nvme_err_invalid_dma();
status = NVME_INVALID_FIELD | NVME_DNR;
}
-
- qemu_iovec_destroy(&iov);
}
return status;
--
2.27.0
- [PATCH 02/17] hw/block/nvme: add mapping helpers, (continued)
- [PATCH 02/17] hw/block/nvme: add mapping helpers, Klaus Jensen, 2020/06/29
- [PATCH 06/17] hw/block/nvme: pass request along for tracing, Klaus Jensen, 2020/06/29
- [PATCH 08/17] hw/block/nvme: verify validity of prp lists in the cmb, Klaus Jensen, 2020/06/29
- [PATCH 10/17] hw/block/nvme: add check for mdts, Klaus Jensen, 2020/06/29
- [PATCH 07/17] hw/block/nvme: add request mapping helper, Klaus Jensen, 2020/06/29
- [PATCH 09/17] hw/block/nvme: refactor request bounds checking, Klaus Jensen, 2020/06/29
- [PATCH 13/17] hw/block/nvme: consolidate qsg/iov clearing, Klaus Jensen, 2020/06/29
- [PATCH 16/17] hw/block/nvme: add nvme_check_rw helper, Klaus Jensen, 2020/06/29
- [PATCH 14/17] hw/block/nvme: remove NvmeCmd parameter, Klaus Jensen, 2020/06/29
- [PATCH 11/17] hw/block/nvme: be consistent about zeros vs zeroes, Klaus Jensen, 2020/06/29
- [PATCH 17/17] hw/block/nvme: use preallocated qsg/iov in nvme_dma_prp,
Klaus Jensen <=
- [PATCH 15/17] hw/block/nvme: allow multiple aios per command, Klaus Jensen, 2020/06/29
- [PATCH 12/17] hw/block/nvme: refactor NvmeRequest clearing, Klaus Jensen, 2020/06/29