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-rw-r--r--linux-core/i915_gem.c110
1 files changed, 85 insertions, 25 deletions
diff --git a/linux-core/i915_gem.c b/linux-core/i915_gem.c
index c5c68af9..ca2dd19c 100644
--- a/linux-core/i915_gem.c
+++ b/linux-core/i915_gem.c
@@ -165,18 +165,12 @@ i915_gem_pread_ioctl(struct drm_device *dev, void *data,
#include "drm_compat.h"
-/**
- * Writes data to the object referenced by handle.
- *
- * On error, the contents of the buffer that were to be modified are undefined.
- */
-int
-i915_gem_pwrite_ioctl(struct drm_device *dev, void *data,
- struct drm_file *file_priv)
+static int
+i915_gem_gtt_pwrite(struct drm_device *dev, struct drm_gem_object *obj,
+ struct drm_i915_gem_pwrite *args,
+ struct drm_file *file_priv)
{
- struct drm_i915_gem_pwrite *args = data;
- struct drm_gem_object *obj;
- struct drm_i915_gem_object *obj_priv;
+ struct drm_i915_gem_object *obj_priv = obj->driver_private;
ssize_t remain;
loff_t offset;
char __user *user_data;
@@ -186,18 +180,6 @@ i915_gem_pwrite_ioctl(struct drm_device *dev, void *data,
unsigned long pfn;
unsigned long unwritten;
- obj = drm_gem_object_lookup(dev, file_priv, args->handle);
- if (obj == NULL)
- return -EINVAL;
-
- /** Bounds check destination.
- *
- * XXX: This could use review for overflow issues...
- */
- if (args->offset > obj->size || args->size > obj->size ||
- args->offset + args->size > obj->size)
- return -EFAULT;
-
user_data = (char __user *) (uintptr_t) args->data_ptr;
remain = args->size;
if (!access_ok(VERIFY_READ, user_data, remain))
@@ -207,7 +189,6 @@ i915_gem_pwrite_ioctl(struct drm_device *dev, void *data,
mutex_lock(&dev->struct_mutex);
ret = i915_gem_object_pin(obj, 0);
if (ret) {
- drm_gem_object_unreference(obj);
mutex_unlock(&dev->struct_mutex);
return ret;
}
@@ -283,13 +264,92 @@ i915_gem_pwrite_ioctl(struct drm_device *dev, void *data,
fail:
i915_gem_object_unpin (obj);
- drm_gem_object_unreference(obj);
mutex_unlock(&dev->struct_mutex);
+ return ret;
+}
+
+int
+i915_gem_shmem_pwrite(struct drm_device *dev, struct drm_gem_object *obj,
+ struct drm_i915_gem_pwrite *args,
+ struct drm_file *file_priv)
+{
+ int ret;
+ loff_t offset;
+ ssize_t written;
+
+ mutex_lock(&dev->struct_mutex);
+
+ ret = i915_gem_set_domain(obj, file_priv,
+ I915_GEM_DOMAIN_CPU, I915_GEM_DOMAIN_CPU);
+ if (ret) {
+ mutex_unlock(&dev->struct_mutex);
+ return ret;
+ }
+
+ offset = args->offset;
+
+ written = vfs_write(obj->filp,
+ (char __user *)(uintptr_t) args->data_ptr,
+ args->size, &offset);
+ if (written != args->size) {
+ mutex_unlock(&dev->struct_mutex);
+ if (written < 0)
+ return written;
+ else
+ return -EINVAL;
+ }
+
+ mutex_unlock(&dev->struct_mutex);
+
+ return 0;
+}
+
+/**
+ * Writes data to the object referenced by handle.
+ *
+ * On error, the contents of the buffer that were to be modified are undefined.
+ */
+int
+i915_gem_pwrite_ioctl(struct drm_device *dev, void *data,
+ struct drm_file *file_priv)
+{
+ struct drm_i915_gem_pwrite *args = data;
+ struct drm_gem_object *obj;
+ struct drm_i915_gem_object *obj_priv;
+ int ret = 0;
+
+ obj = drm_gem_object_lookup(dev, file_priv, args->handle);
+ if (obj == NULL)
+ return -EINVAL;
+ obj_priv = obj->driver_private;
+
+ /** Bounds check destination.
+ *
+ * XXX: This could use review for overflow issues...
+ */
+ if (args->offset > obj->size || args->size > obj->size ||
+ args->offset + args->size > obj->size)
+ return -EFAULT;
+
+ /* We can only do the GTT pwrite on untiled buffers, as otherwise
+ * it would end up going through the fenced access, and we'll get
+ * different detiling behavior between reading and writing.
+ * pread/pwrite currently are reading and writing from the CPU
+ * perspective, requiring manual detiling by the client.
+ */
+ if (obj_priv->tiling_mode == I915_TILING_NONE)
+ ret = i915_gem_gtt_pwrite(dev, obj, args, file_priv);
+ else
+ ret = i915_gem_shmem_pwrite(dev, obj, args, file_priv);
+
#if WATCH_PWRITE
if (ret)
DRM_INFO("pwrite failed %d\n", ret);
#endif
+
+ drm_gem_object_unreference(obj);
+
return ret;
}