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drm/nouveau/bus: remove cpu_coherent flag
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>
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@ -175,7 +175,6 @@ struct nvkm_device_func {
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void (*fini)(struct nvkm_device *, bool suspend);
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resource_size_t (*resource_addr)(struct nvkm_device *, unsigned bar);
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resource_size_t (*resource_size)(struct nvkm_device *, unsigned bar);
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bool cpu_coherent;
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};
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struct nvkm_device_quirk {
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@ -209,8 +209,7 @@ nouveau_bo_new(struct drm_device *dev, int size, int align,
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nvbo->tile_flags = tile_flags;
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nvbo->bo.bdev = &drm->ttm.bdev;
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if (!nvxx_device(&drm->device)->func->cpu_coherent)
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nvbo->force_coherent = flags & TTM_PL_FLAG_UNCACHED;
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nvbo->force_coherent = flags & TTM_PL_FLAG_UNCACHED;
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nvbo->page_shift = 12;
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if (drm->client.vm) {
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@ -1614,7 +1614,6 @@ nvkm_device_pci_func = {
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.fini = nvkm_device_pci_fini,
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.resource_addr = nvkm_device_pci_resource_addr,
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.resource_size = nvkm_device_pci_resource_size,
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.cpu_coherent = !IS_ENABLED(CONFIG_ARM),
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};
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int
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@ -245,7 +245,6 @@ nvkm_device_tegra_func = {
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.fini = nvkm_device_tegra_fini,
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.resource_addr = nvkm_device_tegra_resource_addr,
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.resource_size = nvkm_device_tegra_resource_size,
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.cpu_coherent = false,
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};
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int
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