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authorDaniel Vetter <daniel.vetter@ffwll.ch>2013-08-08 15:41:27 +0200
committerDave Airlie <airlied@redhat.com>2013-08-19 14:11:44 +1000
commit281856477cdaba70032af502ee7192fe7aa54f69 (patch)
tree9508848a347fdbb74279ffdad04b1da9240f6e84 /include/drm
parent1216f732379151cd581444e385a8266d0b54549d (diff)
drm: rip out drm_core_has_MTRR checks
The new arch_phys_wc_add/del functions do the right thing both with and without MTRR support in the kernel. So we can drop these additional checks. David Herrmann suggest to also kill the DRIVER_USE_MTRR flag since it's now unused, which spurred me to do a bit a better audit of the affected drivers. David helped a lot in that. Quoting our mail discussion: On Wed, Jul 10, 2013 at 5:41 PM, David Herrmann <dh.herrmann@gmail.com> wrote: > On Wed, Jul 10, 2013 at 5:22 PM, Daniel Vetter <daniel.vetter@ffwll.ch> wrote: >> On Wed, Jul 10, 2013 at 3:51 PM, David Herrmann <dh.herrmann@gmail.com> wrote: >>>> -#if __OS_HAS_MTRR >>>> -static inline int drm_core_has_MTRR(struct drm_device *dev) >>>> -{ >>>> - return drm_core_check_feature(dev, DRIVER_USE_MTRR); >>>> -} >>>> -#else >>>> -#define drm_core_has_MTRR(dev) (0) >>>> -#endif >>>> - >>> >>> That was the last user of DRIVER_USE_MTRR (apart from drivers setting >>> it in .driver_features). Any reason to keep it around? >> >> Yeah, I guess we could rip things out. Which will also force me to >> properly audit drivers for the eventual behaviour change this could >> entail (in case there's an x86 driver which did not ask for an mtrr, >> but iirc there isn't). > > david@david-mb ~/dev/kernel/linux $ for i in drivers/gpu/drm/* ; do if > test -d "$i" ; then if ! grep -q USE_MTRR -r $i ; then echo $i ; fi ; > fi ; done > drivers/gpu/drm/exynos > drivers/gpu/drm/gma500 > drivers/gpu/drm/i2c > drivers/gpu/drm/nouveau > drivers/gpu/drm/omapdrm > drivers/gpu/drm/qxl > drivers/gpu/drm/rcar-du > drivers/gpu/drm/shmobile > drivers/gpu/drm/tilcdc > drivers/gpu/drm/ttm > drivers/gpu/drm/udl > drivers/gpu/drm/vmwgfx > david@david-mb ~/dev/kernel/linux $ > > So for x86 gma500,nouveau,qxl,udl,vmwgfx don't set DRIVER_USE_MTRR. > But I cannot tell whether they break if we call arch_phys_wc_add/del, > anyway. At least nouveau seemed to work here, but it doesn't use AGP > or drm_bufs, I guess. Cool, thanks a lot for stitching together the list of drivers to look at. So for real KMS drivers it's the drives responsibility to add an mtrr if it needs one. nouvea, radeon, mgag200, i915 and vmwgfx do that already. Somehow the savage driver also ends up doing that, I have no idea why. Note that gma500 as a pure KMS driver doesn't need MTRR setup since the platforms that it supports all support PAT. So no MTRRs needed to get wc iomappings. The mtrr support in the drm core is all for legacy mappings of garts, framebuffers and registers. All legacy drivers set the USE_MTRR flag, so we're good there. All in all I think we can really just ditch this /endquote v2: Also kill DRIVER_USE_MTRR as suggested by David Herrmann v3: Rebase on top of David Herrmann's agp setup/cleanup changes. Cc: David Herrmann <dh.herrmann@gmail.com> Cc: Andy Lutomirski <luto@amacapital.net> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Acked-by: Andy Lutomirski <luto@amacapital.net> Reviewed-by: David Herrmann <dh.herrmann@gmail.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'include/drm')
-rw-r--r--include/drm/drmP.h11
1 files changed, 0 insertions, 11 deletions
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index 0ef8e5481e15..139d859adf16 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -74,7 +74,6 @@
#include <linux/idr.h>
#define __OS_HAS_AGP (defined(CONFIG_AGP) || (defined(CONFIG_AGP_MODULE) && defined(MODULE)))
-#define __OS_HAS_MTRR (defined(CONFIG_MTRR))
struct module;
@@ -139,7 +138,6 @@ int drm_err(const char *func, const char *format, ...);
/* driver capabilities and requirements mask */
#define DRIVER_USE_AGP 0x1
#define DRIVER_REQUIRE_AGP 0x2
-#define DRIVER_USE_MTRR 0x4
#define DRIVER_PCI_DMA 0x8
#define DRIVER_SG 0x10
#define DRIVER_HAVE_DMA 0x20
@@ -1216,15 +1214,6 @@ static inline int drm_dev_to_irq(struct drm_device *dev)
return dev->driver->bus->get_irq(dev);
}
-#if __OS_HAS_MTRR
-static inline int drm_core_has_MTRR(struct drm_device *dev)
-{
- return drm_core_check_feature(dev, DRIVER_USE_MTRR);
-}
-#else
-#define drm_core_has_MTRR(dev) (0)
-#endif
-
static inline void drm_device_set_unplugged(struct drm_device *dev)
{
smp_wmb();