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drm/tegra: Implement correct DMA-BUF semantics

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DMA-BUF requires that each device that accesses a DMA-BUF attaches to it
separately. To do so the host1x_bo_pin() and host1x_bo_unpin() functions
need to be reimplemented so that they can return a mapping, which either
represents an attachment or a map of the driver's own GEM object.

Bug 200768479

Signed-off-by: Thierry Reding <treding@nvidia.com>
Change-Id: Ia380b7dcc371ce47f5f35d44a60fbd6b4ab9d636
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvidia/+/2596398
(cherry picked from commit 28960586000fca025689edfd45645ab28e497bca)
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvidia/+/2620137
Tested-by: Jonathan Hunter <jonathanh@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
Reviewed-by: Jonathan Hunter <jonathanh@nvidia.com>
Reviewed-by: svc_kernel_abi <svc_kernel_abi@nvidia.com>
Reviewed-by: Mikko Perttunen <mperttunen@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
GVS: Gerrit_Virtual_Submit
This commit is contained in:
Thierry Reding
2021-09-09 15:51:24 +02:00
committed by Laxman Dewangan
parent 65450ce220
commit 756aa327f1
6 changed files with 176 additions and 159 deletions
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5
drivers/gpu/drm/tegra/uapi.h
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@@ -32,10 +32,9 @@ struct tegra_drm_channel_ctx {
struct tegra_drm_mapping {
struct kref ref;
struct device *dev;
struct host1x_bo_mapping *map;
struct host1x_bo *bo;
struct sg_table *sgt;
enum dma_data_direction direction;
dma_addr_t iova;
dma_addr_t iova_end;
};