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drm: GEM mmap support

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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>
This commit is contained in:
Jesse Barnes
2008-11-05 10:31:53 -08:00
committed by Dave Airlie
parent a9587470f7
commit a2c0a97b78
8 changed files with 161 additions and 3 deletions
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12
drivers/gpu/drm/drm_fops.c
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@@ -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);