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drm/nouveau: introduce nv_device_is_cpu_coherent() 

Add a function allowing us to know whether a device is CPU-coherent,
i.e. accesses performed by the CPU on GPU-mapped buffers will
be immediately visible on the GPU side and vice-versa.

For now, a device is considered to be coherent if it uses the PCI bus on
a non-ARM architecture.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Alexandre Courbot 2014-10-27 18:49:16 +09:00 committed by Ben Skeggs
parent 5be5a15a43
commit c5d7ddf70a
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/nouveau/core/include/core/device.h
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@ -158,6 +158,12 @@ nv_device_is_pci(struct nouveau_device *device)
return device->pdev != NULL;
}
static inline bool
nv_device_is_cpu_coherent(struct nouveau_device *device)
{
return (!IS_ENABLED(CONFIG_ARM) && nv_device_is_pci(device));
}
static inline struct device *
nv_device_base(struct nouveau_device *device)
{