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authorJesse Barnes <jbarnes@virtuousgeek.org>2008-11-05 19:31:53 +0100
committerDave Airlie <airlied@linux.ie>2008-12-29 08:47:22 +0100
commita2c0a97b784f837300f7b0869c82ab712c600952 (patch)
treeaca1cdf3d32e1cfa7387350483f6a70c74a24ffd /drivers/gpu/drm/drm_fops.c
parentdrm/i915: Add /proc debugging entry for reading out the HWS. (diff)
downloadlinux-a2c0a97b784f837300f7b0869c82ab712c600952.tar.xz
linux-a2c0a97b784f837300f7b0869c82ab712c600952.zip
drm: GEM mmap support
Add core support for mapping of GEM objects. Drivers should provide a vm_operations_struct if they want to support page faulting of objects. The code for handling GEM object offsets was taken from TTM, which was written by Thomas Hellström. Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org> Signed-off-by: Eric Anholt <eric@anholt.net> Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/drm_fops.c')
-rw-r--r--drivers/gpu/drm/drm_fops.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/gpu/drm/drm_fops.c b/drivers/gpu/drm/drm_fops.c
index f2285237df49..3a6c439652a5 100644
--- a/drivers/gpu/drm/drm_fops.c
+++ b/drivers/gpu/drm/drm_fops.c
@@ -133,11 +133,21 @@ int drm_open(struct inode *inode, struct file *filp)
spin_lock(&dev->count_lock);
if (!dev->open_count++) {
spin_unlock(&dev->count_lock);
- return drm_setup(dev);
+ retcode = drm_setup(dev);
+ goto out;
}
spin_unlock(&dev->count_lock);
}
+out:
+ mutex_lock(&dev->struct_mutex);
+ if (dev->dev_mapping == NULL)
+ dev->dev_mapping = inode->i_mapping;
+ else if (dev->dev_mapping != inode->i_mapping)
+ WARN(1, "dev->dev_mapping not inode mapping (%p expected %p)\n",
+ dev->dev_mapping, inode->i_mapping);
+ mutex_unlock(&dev->struct_mutex);
+
return retcode;
}
EXPORT_SYMBOL(drm_open);