From: Mark Yao <mark.yao@rock-chips.com>
Date: Thu, 13 Jul 2017 06:56:33 +0000 (+0800)
Subject: drm/prime: add dmabuf begin/end cpu access
X-Git-Tag: release-20171130_firefly~4^2~192
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=c6036ecd268097f766428a6c0290e48b98a65dcc;p=firefly-linux-kernel-4.4.55.git

drm/prime: add dmabuf begin/end cpu access

Change-Id: I0b4be7f8d78142024a2067db041e4f1c2670086c
Signed-off-by: Mark Yao <mark.yao@rock-chips.com>
---

diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c
index 3331c5647d18..6f207d5946dc 100644
--- a/drivers/gpu/drm/drm_prime.c
+++ b/drivers/gpu/drm/drm_prime.c
@@ -293,6 +293,32 @@ static int drm_gem_dmabuf_mmap(struct dma_buf *dma_buf,
 	return dev->driver->gem_prime_mmap(obj, vma);
 }
 
+static int drm_gem_dmabuf_begin_cpu_access(struct dma_buf *dma_buf,
+					   size_t start, size_t len,
+					   enum dma_data_direction dir)
+{
+	struct drm_gem_object *obj = dma_buf->priv;
+	struct drm_device *dev = obj->dev;
+
+	if (!dev->driver->gem_prime_begin_cpu_access)
+		return -ENOSYS;
+
+	return dev->driver->gem_prime_begin_cpu_access(obj, start, len, dir);
+}
+
+static void drm_gem_dmabuf_end_cpu_access(struct dma_buf *dma_buf,
+					  size_t start, size_t len,
+					  enum dma_data_direction dir)
+{
+	struct drm_gem_object *obj = dma_buf->priv;
+	struct drm_device *dev = obj->dev;
+
+	if (!dev->driver->gem_prime_end_cpu_access)
+		return;
+
+	dev->driver->gem_prime_end_cpu_access(obj, start, len, dir);
+}
+
 static const struct dma_buf_ops drm_gem_prime_dmabuf_ops =  {
 	.attach = drm_gem_map_attach,
 	.detach = drm_gem_map_detach,
@@ -306,6 +332,8 @@ static const struct dma_buf_ops drm_gem_prime_dmabuf_ops =  {
 	.mmap = drm_gem_dmabuf_mmap,
 	.vmap = drm_gem_dmabuf_vmap,
 	.vunmap = drm_gem_dmabuf_vunmap,
+	.begin_cpu_access = drm_gem_dmabuf_begin_cpu_access,
+	.end_cpu_access = drm_gem_dmabuf_end_cpu_access,
 };
 
 /**
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index 418d5fcd598e..06f801624585 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -675,6 +675,12 @@ struct drm_driver {
 	void (*gem_prime_vunmap)(struct drm_gem_object *obj, void *vaddr);
 	int (*gem_prime_mmap)(struct drm_gem_object *obj,
 				struct vm_area_struct *vma);
+	int (*gem_prime_begin_cpu_access)(struct drm_gem_object *obj,
+					  size_t, size_t,
+					  enum dma_data_direction);
+	void (*gem_prime_end_cpu_access)(struct drm_gem_object *obj,
+					 size_t, size_t,
+					 enum dma_data_direction);
 
 	/* vga arb irq handler */
 	void (*vgaarb_irq)(struct drm_device *dev, bool state);