lkml.org 
[lkml]   [2014]   [Oct]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v5 1/4] drm: introduce nv_device_is_cpu_coherent()
Date
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>
---
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


\
 
 \ /
  Last update: 2014-10-27 11:21    [W:0.062 / U:0.100 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site