linux-kernel - [PATCH v5 1/4] drm: introduce nv_device_is_cpu

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Date:	Mon, 27 Oct 2014 18:49:16 +0900
From:	Alexandre Courbot <acourbot@...dia.com>
To:	Ben Skeggs <bskeggs@...hat.com>, David Airlie <airlied@...ux.ie>,
	David Herrmann <dh.herrmann@...il.com>,
	Lucas Stach <dev@...xeye.de>,
	Thierry Reding <thierry.reding@...il.com>,
	Maarten Lankhorst <maarten.lankhorst@...onical.com>
CC:	<nouveau@...ts.freedesktop.org>, <dri-devel@...ts.freedesktop.org>,
	<linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<gnurou@...il.com>, Alexandre Courbot <acourbot@...dia.com>
Subject: [PATCH v5 1/4] drm: 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@...dia.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

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