From 281856477cdaba70032af502ee7192fe7aa54f69 Mon Sep 17 00:00:00 2001 From: Daniel Vetter Date: Thu, 8 Aug 2013 15:41:27 +0200 Subject: 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 wrote: > On Wed, Jul 10, 2013 at 5:22 PM, Daniel Vetter wrote: >> On Wed, Jul 10, 2013 at 3:51 PM, David Herrmann 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 Cc: Andy Lutomirski Signed-off-by: Daniel Vetter Acked-by: Andy Lutomirski Reviewed-by: David Herrmann Signed-off-by: Dave Airlie --- drivers/gpu/drm/sis/sis_drv.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/gpu/drm/sis') diff --git a/drivers/gpu/drm/sis/sis_drv.c b/drivers/gpu/drm/sis/sis_drv.c index b88b2d302105..4383b74a3aa4 100644 --- a/drivers/gpu/drm/sis/sis_drv.c +++ b/drivers/gpu/drm/sis/sis_drv.c @@ -102,7 +102,7 @@ void sis_driver_postclose(struct drm_device *dev, struct drm_file *file) } static struct drm_driver driver = { - .driver_features = DRIVER_USE_AGP | DRIVER_USE_MTRR, + .driver_features = DRIVER_USE_AGP, .load = sis_driver_load, .unload = sis_driver_unload, .open = sis_driver_open, -- cgit v1.2.3