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@xxxxxxxxxx>
---
lib/core/os.h | 2 ++
nvkm/include/core/device.h | 6 ++++++
2 files changed, 8 insertions(+)
diff --git a/lib/core/os.h b/lib/core/os.h
index fba9542292ac..79462eb2cfd4 100644
--- a/lib/core/os.h
+++ b/lib/core/os.h
@@ -101,6 +101,8 @@ typedef dma_addr_t resource_size_t;
#define __printf(a,b)
#define __user
+#define IS_ENABLED(x) (0)
+
static inline int
order_base_2(u64 base)
{
diff --git a/nvkm/include/core/device.h b/nvkm/include/core/device.h
index 1d9d893929bb..0d839e1ddaf4 100644
--- a/nvkm/include/core/device.h
+++ b/nvkm/include/core/device.h
@@ -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)
{
--
2.1.2
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