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drm/nouveau/bus: remove cpu_coherent flag

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This flag's only remaining function is to ignore the uncached flag for
BOs on coherent architectures.

However the reason for allocating an object uncache on a non-coherent
architecture (namely because the cost of doing explicit flushes/
invalidations is higher than the benefit of caching the data because
accesses are few and far between) should also apply on architectures for
which coherency is maintained implicitly. Thus allocate coherent objects
as uncached on all architectures.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Alexandre Courbot 2016-07-13 15:29:36 +09:00 committed by Ben Skeggs
parent 36a471baa8
commit aff51175cd
4 changed files with 1 additions and 5 deletions
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1
drivers/gpu/drm/nouveau/include/nvkm/core/device.h
View file

@ -175,7 +175,6 @@ struct nvkm_device_func {
void (*fini)(struct nvkm_device *, bool suspend);
resource_size_t (*resource_addr)(struct nvkm_device *, unsigned bar);
resource_size_t (*resource_size)(struct nvkm_device *, unsigned bar);
bool cpu_coherent;
};
struct nvkm_device_quirk {

3
drivers/gpu/drm/nouveau/nouveau_bo.c
View file

@ -209,8 +209,7 @@ nouveau_bo_new(struct drm_device *dev, int size, int align,
nvbo->tile_flags = tile_flags;
nvbo->bo.bdev = &drm->ttm.bdev;
if (!nvxx_device(&drm->device)->func->cpu_coherent)
nvbo->force_coherent = flags & TTM_PL_FLAG_UNCACHED;
nvbo->force_coherent = flags & TTM_PL_FLAG_UNCACHED;
nvbo->page_shift = 12;
if (drm->client.vm) {

1
drivers/gpu/drm/nouveau/nvkm/engine/device/pci.c
View file

@ -1614,7 +1614,6 @@ nvkm_device_pci_func = {
.fini = nvkm_device_pci_fini,
.resource_addr = nvkm_device_pci_resource_addr,
.resource_size = nvkm_device_pci_resource_size,
.cpu_coherent = !IS_ENABLED(CONFIG_ARM),
};
int

1
drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c
View file

@ -245,7 +245,6 @@ nvkm_device_tegra_func = {
.fini = nvkm_device_tegra_fini,
.resource_addr = nvkm_device_tegra_resource_addr,
.resource_size = nvkm_device_tegra_resource_size,
.cpu_coherent = false,
};
int