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i915: use io-mapping interfaces instead of a variety of mapping kludges

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Impact: optimize/clean-up the IO mapping implementation of the i915 DRM driver

Switch the i915 device aperture mapping to the io-mapping interface, taking
advantage of the cleaner API to extend it across all of the mapping uses,
including both pwrite and relocation updates.

This dramatically improves performance on 64-bit kernels which were using
the same slow path as 32-bit non-HIGHMEM kernels prior to this patch.

Signed-off-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Keith Packard
2008-10-30 19:38:48 -07:00
committed by Ingo Molnar
parent 9663f2e6a6
commit 0839ccb8ac
2 changed files with 83 additions and 94 deletions
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3
drivers/gpu/drm/i915/i915_drv.h
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@@ -31,6 +31,7 @@
#define _I915_DRV_H_
#include "i915_reg.h"
#include <linux/io-mapping.h>
/* General customization:
*/
@@ -246,6 +247,8 @@ typedef struct drm_i915_private {
struct {
struct drm_mm gtt_space;
struct io_mapping *gtt_mapping;
/**
* List of objects currently involved in rendering from the
* ringbuffer.