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drm/tegra: Implement buffer object cache

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This cache is used to avoid mapping and unmapping buffer objects
unnecessarily. Mappings are cached per client and stay hot until
the buffer object is destroyed.

Bug 200768479

Signed-off-by: Thierry Reding <treding@nvidia.com>
Change-Id: Ia2efe2b77b5043b665bae403d9eba4698e6a5228
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvidia/+/2596399
(cherry picked from commit d23156d94fa9499256e8082250e3bc02559f9c8d)
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvidia/+/2620152
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
2020-02-07 16:50:52 +01:00
committed by Laxman Dewangan
parent 756aa327f1
commit 1da27ee38f
4 changed files with 14 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
drivers/gpu/drm/tegra/gem.c
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@@ -60,6 +60,7 @@ static struct host1x_bo_mapping *tegra_bo_pin(struct device *dev, struct host1x_
if (!map)
return ERR_PTR(-ENOMEM);
kref_init(&map->ref);
map->bo = host1x_bo_get(bo);
map->direction = direction;
map->dev = dev;
@@ -150,9 +151,6 @@ free:
static void tegra_bo_unpin(struct host1x_bo_mapping *map)
{
if (!map)
return;
if (map->attach) {
dma_buf_unmap_attachment(map->attach, map->sgt, map->direction);
dma_buf_detach(map->attach->dmabuf, map->attach);
@@ -503,8 +501,18 @@ free:
void tegra_bo_free_object(struct drm_gem_object *gem)
{
struct tegra_drm *tegra = gem->dev->dev_private;
struct host1x_bo_mapping *mapping, *tmp;
struct tegra_bo *bo = to_tegra_bo(gem);
/* remove all mappings of this buffer object from any caches */
list_for_each_entry_safe(mapping, tmp, &bo->base.mappings, list) {
if (mapping->cache)
host1x_bo_unpin(mapping);
else
dev_err(gem->dev->dev, "mapping %p stale for device %s\n", mapping,
dev_name(mapping->dev));
}
if (tegra->domain)
tegra_bo_iommu_unmap(tegra, bo);