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vblk: Pass correct direction for DMA map/unmap

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The tegra_hv_vblk driver use DMA_BIDIRECTIONAL in
dma_map/dma_unmap for both read and write.
It could add unnecessary CMO for cpu/for device (depends on R/W).
Fixed this by passing the correct direction for
DMA map/unmap based on read/write operation.

Bug 5221800

Change-Id: Ieee50fa66c18a8e1bf23db749eba0c5f2d3745b2
Signed-off-by: Sanjith T D <std@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3340025
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Reviewed-by: svcacv <svcacv@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
GVS: buildbot_gerritrpt <buildbot_gerritrpt@nvidia.com>
Reviewed-by: Vipin Kumar <vipink@nvidia.com>
Reviewed-by: Sreenivas Velpula <svelpula@nvidia.com>
This commit is contained in:
Sanjith T D
2025-04-14 10:41:54 +00:00
committed by Jon Hunter
parent 22336de810
commit 45a0155889
2 changed files with 14 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/block/tegra_virt_storage/tegra_hv_vblk.c
View File

@@ -360,7 +360,7 @@ end:
dma_unmap_sg(vblkdev->device,
vsc_req->sg_lst,
vsc_req->sg_num_ents,
DMA_BIDIRECTIONAL);
vsc_req->dma_direction);
devm_kfree(vblkdev->device, vsc_req->sg_lst);
}
}
@@ -531,6 +531,16 @@ static enum blk_cmd_op cleanup_op_supported(struct vblk_dev *vblkdev, uint32_t o
return cleanup_op;
}
static enum dma_data_direction get_dma_data_direction(struct request *bio_req)
{
if (req_op(bio_req) == REQ_OP_READ)
return DMA_FROM_DEVICE;
else if (req_op(bio_req) == REQ_OP_WRITE)
return DMA_TO_DEVICE;
else
return DMA_NONE;
}
/**
* submit_bio_req: Fetch a bio request and submit it to
* server for processing.
@@ -602,8 +612,9 @@ static bool submit_bio_req(struct vblk_dev *vblkdev)
vsc_req->sg_lst);
#endif
vsc_req->sg_num_ents = sg_nents(vsc_req->sg_lst);
vsc_req->dma_direction = get_dma_data_direction(bio_req);
if (dma_map_sg(vblkdev->device, vsc_req->sg_lst,
vsc_req->sg_num_ents, DMA_BIDIRECTIONAL) == 0) {
vsc_req->sg_num_ents, vsc_req->dma_direction) == 0) {
dev_err(vblkdev->device, "dma_map_sg failed\n");
goto bio_exit;
}

1
drivers/block/tegra_virt_storage/tegra_vblk.h
View File

@@ -70,6 +70,7 @@ struct vsc_request {
/* Timer to track bio request completion*/
struct timer_list timer;
uint64_t time;
enum dma_data_direction dma_direction;
};
enum vblk_queue_state {