[17/25] drm: rip out drm_core_has_MTRR checks
diff mbox

Message ID 1375969295-18929-18-git-send-email-daniel.vetter@ffwll.ch
State Accepted
Headers show

Commit Message

Daniel Vetter Aug. 8, 2013, 1:41 p.m. UTC
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>
---
 drivers/gpu/drm/ast/ast_drv.c         |  2 +-
 drivers/gpu/drm/cirrus/cirrus_drv.c   |  2 +-
 drivers/gpu/drm/drm_bufs.c            | 13 +++++--------
 drivers/gpu/drm/drm_pci.c             | 14 ++++++--------
 drivers/gpu/drm/drm_vm.c              |  3 +--
 drivers/gpu/drm/i810/i810_drv.c       |  2 +-
 drivers/gpu/drm/i915/i915_drv.c       |  2 +-
 drivers/gpu/drm/mga/mga_drv.c         |  2 +-
 drivers/gpu/drm/mgag200/mgag200_drv.c |  2 +-
 drivers/gpu/drm/r128/r128_drv.c       |  2 +-
 drivers/gpu/drm/radeon/radeon_drv.c   |  4 ++--
 drivers/gpu/drm/savage/savage_drv.c   |  2 +-
 drivers/gpu/drm/sis/sis_drv.c         |  2 +-
 drivers/gpu/drm/tdfx/tdfx_drv.c       |  1 -
 drivers/gpu/drm/via/via_drv.c         |  2 +-
 include/drm/drmP.h                    | 11 -----------
 16 files changed, 24 insertions(+), 42 deletions(-)

Comments

Andy Lutomirski Aug. 9, 2013, 6:12 p.m. UTC | #1
On Thu, Aug 8, 2013 at 6:41 AM, Daniel Vetter <daniel.vetter@ffwll.ch> wrote:
> 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.

If any of the new arch_phys_wc_add calls are reachable and if the
driver calls arch_phys_wc_add itself, then the lack of refcounting on
non-PAT systems may cause a problem.  (I don't understand the drm
stuff well enough to know whether that can actually happen.)

--Andy
Daniel Vetter Aug. 9, 2013, 6:36 p.m. UTC | #2
On Fri, Aug 9, 2013 at 8:12 PM, Andy Lutomirski <luto@amacapital.net> wrote:
> On Thu, Aug 8, 2013 at 6:41 AM, Daniel Vetter <daniel.vetter@ffwll.ch> wrote:
>> 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.
>
> If any of the new arch_phys_wc_add calls are reachable and if the
> driver calls arch_phys_wc_add itself, then the lack of refcounting on
> non-PAT systems may cause a problem.  (I don't understand the drm
> stuff well enough to know whether that can actually happen.)

This is only about compile-time options really. Somehow drm had the
idea to use these check functions instead of #ifdef plus dummy static
inline noop functions. David Herrmann just did the same patch for the
agp stuff. So refcounting is of no concern here.
-Daniel
Andy Lutomirski Aug. 9, 2013, 6:39 p.m. UTC | #3
On Fri, Aug 9, 2013 at 11:36 AM, Daniel Vetter <daniel.vetter@ffwll.ch> wrote:
> On Fri, Aug 9, 2013 at 8:12 PM, Andy Lutomirski <luto@amacapital.net> wrote:
>> On Thu, Aug 8, 2013 at 6:41 AM, Daniel Vetter <daniel.vetter@ffwll.ch> wrote:
>>> 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.
>>
>> If any of the new arch_phys_wc_add calls are reachable and if the
>> driver calls arch_phys_wc_add itself, then the lack of refcounting on
>> non-PAT systems may cause a problem.  (I don't understand the drm
>> stuff well enough to know whether that can actually happen.)
>
> This is only about compile-time options really. Somehow drm had the
> idea to use these check functions instead of #ifdef plus dummy static
> inline noop functions. David Herrmann just did the same patch for the
> agp stuff. So refcounting is of no concern here.

I feel like I'm missing something obvious here.  On nouveau, prior to
this patch, the drm maps code would not touch mtrrs.  Now it will.
Nouveau already calls arch_phys_wc_add, so if that maps code is
reached on the same resource, then there could be refcounting issues.

--Andy

> -Daniel
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> +41 (0) 79 365 57 48 - http://blog.ffwll.ch
Daniel Vetter Aug. 9, 2013, 6:47 p.m. UTC | #4
On Fri, Aug 9, 2013 at 8:39 PM, Andy Lutomirski <luto@amacapital.net> wrote:
> On Fri, Aug 9, 2013 at 11:36 AM, Daniel Vetter <daniel.vetter@ffwll.ch> wrote:
>> On Fri, Aug 9, 2013 at 8:12 PM, Andy Lutomirski <luto@amacapital.net> wrote:
>>> On Thu, Aug 8, 2013 at 6:41 AM, Daniel Vetter <daniel.vetter@ffwll.ch> wrote:
>>>> 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.
>>>
>>> If any of the new arch_phys_wc_add calls are reachable and if the
>>> driver calls arch_phys_wc_add itself, then the lack of refcounting on
>>> non-PAT systems may cause a problem.  (I don't understand the drm
>>> stuff well enough to know whether that can actually happen.)
>>
>> This is only about compile-time options really. Somehow drm had the
>> idea to use these check functions instead of #ifdef plus dummy static
>> inline noop functions. David Herrmann just did the same patch for the
>> agp stuff. So refcounting is of no concern here.
>
> I feel like I'm missing something obvious here.  On nouveau, prior to
> this patch, the drm maps code would not touch mtrrs.  Now it will.
> Nouveau already calls arch_phys_wc_add, so if that maps code is
> reached on the same resource, then there could be refcounting issues.

Oh that kind of confusion. The maps code here is for old userspace
drivers, I have some patches in the queue that will disable it
properly for kms drivers. So it should never happen that both the kms
driver and the maps code in the drm core set up a mtrr mapping. And if
it happens someone is doing something really nasty, and that hole will
soon be plugged.
-Daniel
Andy Lutomirski Aug. 9, 2013, 6:48 p.m. UTC | #5
On Fri, Aug 9, 2013 at 11:47 AM, Daniel Vetter <daniel.vetter@ffwll.ch> wrote:
> On Fri, Aug 9, 2013 at 8:39 PM, Andy Lutomirski <luto@amacapital.net> wrote:
>> On Fri, Aug 9, 2013 at 11:36 AM, Daniel Vetter <daniel.vetter@ffwll.ch> wrote:
>>> On Fri, Aug 9, 2013 at 8:12 PM, Andy Lutomirski <luto@amacapital.net> wrote:
>>>> On Thu, Aug 8, 2013 at 6:41 AM, Daniel Vetter <daniel.vetter@ffwll.ch> wrote:
>>>>> 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.
>>>>
>>>> If any of the new arch_phys_wc_add calls are reachable and if the
>>>> driver calls arch_phys_wc_add itself, then the lack of refcounting on
>>>> non-PAT systems may cause a problem.  (I don't understand the drm
>>>> stuff well enough to know whether that can actually happen.)
>>>
>>> This is only about compile-time options really. Somehow drm had the
>>> idea to use these check functions instead of #ifdef plus dummy static
>>> inline noop functions. David Herrmann just did the same patch for the
>>> agp stuff. So refcounting is of no concern here.
>>
>> I feel like I'm missing something obvious here.  On nouveau, prior to
>> this patch, the drm maps code would not touch mtrrs.  Now it will.
>> Nouveau already calls arch_phys_wc_add, so if that maps code is
>> reached on the same resource, then there could be refcounting issues.
>
> Oh that kind of confusion. The maps code here is for old userspace
> drivers, I have some patches in the queue that will disable it
> properly for kms drivers. So it should never happen that both the kms
> driver and the maps code in the drm core set up a mtrr mapping. And if
> it happens someone is doing something really nasty, and that hole will
> soon be plugged.

In that case, I'm convinced.  In case you care:

Acked-by: Andy Lutomirski <luto@amacapital.net>

--Andy

> -Daniel
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> +41 (0) 79 365 57 48 - http://blog.ffwll.ch
David Herrmann Aug. 15, 2013, 12:44 p.m. UTC | #6
Hi

On Thu, Aug 8, 2013 at 3:41 PM, Daniel Vetter <daniel.vetter@ffwll.ch> wrote:
> 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>

Reviewed-by: David Herrmann <dh.herrmann@gmail.com>

Regards
David

> ---
>  drivers/gpu/drm/ast/ast_drv.c         |  2 +-
>  drivers/gpu/drm/cirrus/cirrus_drv.c   |  2 +-
>  drivers/gpu/drm/drm_bufs.c            | 13 +++++--------
>  drivers/gpu/drm/drm_pci.c             | 14 ++++++--------
>  drivers/gpu/drm/drm_vm.c              |  3 +--
>  drivers/gpu/drm/i810/i810_drv.c       |  2 +-
>  drivers/gpu/drm/i915/i915_drv.c       |  2 +-
>  drivers/gpu/drm/mga/mga_drv.c         |  2 +-
>  drivers/gpu/drm/mgag200/mgag200_drv.c |  2 +-
>  drivers/gpu/drm/r128/r128_drv.c       |  2 +-
>  drivers/gpu/drm/radeon/radeon_drv.c   |  4 ++--
>  drivers/gpu/drm/savage/savage_drv.c   |  2 +-
>  drivers/gpu/drm/sis/sis_drv.c         |  2 +-
>  drivers/gpu/drm/tdfx/tdfx_drv.c       |  1 -
>  drivers/gpu/drm/via/via_drv.c         |  2 +-
>  include/drm/drmP.h                    | 11 -----------
>  16 files changed, 24 insertions(+), 42 deletions(-)
>
> diff --git a/drivers/gpu/drm/ast/ast_drv.c b/drivers/gpu/drm/ast/ast_drv.c
> index 60f1ce3..32e270d 100644
> --- a/drivers/gpu/drm/ast/ast_drv.c
> +++ b/drivers/gpu/drm/ast/ast_drv.c
> @@ -197,7 +197,7 @@ static const struct file_operations ast_fops = {
>  };
>
>  static struct drm_driver driver = {
> -       .driver_features = DRIVER_USE_MTRR | DRIVER_MODESET | DRIVER_GEM,
> +       .driver_features = DRIVER_MODESET | DRIVER_GEM,
>         .dev_priv_size = 0,
>
>         .load = ast_driver_load,
> diff --git a/drivers/gpu/drm/cirrus/cirrus_drv.c b/drivers/gpu/drm/cirrus/cirrus_drv.c
> index dd9c908..138364d 100644
> --- a/drivers/gpu/drm/cirrus/cirrus_drv.c
> +++ b/drivers/gpu/drm/cirrus/cirrus_drv.c
> @@ -87,7 +87,7 @@ static const struct file_operations cirrus_driver_fops = {
>  #endif
>  };
>  static struct drm_driver driver = {
> -       .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_USE_MTRR,
> +       .driver_features = DRIVER_MODESET | DRIVER_GEM,
>         .load = cirrus_driver_load,
>         .unload = cirrus_driver_unload,
>         .fops = &cirrus_driver_fops,
> diff --git a/drivers/gpu/drm/drm_bufs.c b/drivers/gpu/drm/drm_bufs.c
> index 5f73f0a..f63133b 100644
> --- a/drivers/gpu/drm/drm_bufs.c
> +++ b/drivers/gpu/drm/drm_bufs.c
> @@ -207,12 +207,10 @@ static int drm_addmap_core(struct drm_device * dev, resource_size_t offset,
>                         return 0;
>                 }
>
> -               if (drm_core_has_MTRR(dev)) {
> -                       if (map->type == _DRM_FRAME_BUFFER ||
> -                           (map->flags & _DRM_WRITE_COMBINING)) {
> -                               map->mtrr =
> -                                       arch_phys_wc_add(map->offset, map->size);
> -                       }
> +               if (map->type == _DRM_FRAME_BUFFER ||
> +                   (map->flags & _DRM_WRITE_COMBINING)) {
> +                       map->mtrr =
> +                               arch_phys_wc_add(map->offset, map->size);
>                 }
>                 if (map->type == _DRM_REGISTERS) {
>                         if (map->flags & _DRM_WRITE_COMBINING)
> @@ -464,8 +462,7 @@ int drm_rmmap_locked(struct drm_device *dev, struct drm_local_map *map)
>                 iounmap(map->handle);
>                 /* FALLTHROUGH */
>         case _DRM_FRAME_BUFFER:
> -               if (drm_core_has_MTRR(dev))
> -                       arch_phys_wc_del(map->mtrr);
> +               arch_phys_wc_del(map->mtrr);
>                 break;
>         case _DRM_SHM:
>                 vfree(map->handle);
> diff --git a/drivers/gpu/drm/drm_pci.c b/drivers/gpu/drm/drm_pci.c
> index 0f54ad8..3fca2db 100644
> --- a/drivers/gpu/drm/drm_pci.c
> +++ b/drivers/gpu/drm/drm_pci.c
> @@ -272,12 +272,11 @@ static int drm_pci_agp_init(struct drm_device *dev)
>                         DRM_ERROR("Cannot initialize the agpgart module.\n");
>                         return -EINVAL;
>                 }
> -               if (drm_core_has_MTRR(dev)) {
> -                       if (dev->agp)
> -                               dev->agp->agp_mtrr = arch_phys_wc_add(
> -                                       dev->agp->agp_info.aper_base,
> -                                       dev->agp->agp_info.aper_size *
> -                                       1024 * 1024);
> +               if (dev->agp) {
> +                       dev->agp->agp_mtrr = arch_phys_wc_add(
> +                               dev->agp->agp_info.aper_base,
> +                               dev->agp->agp_info.aper_size *
> +                               1024 * 1024);
>                 }
>         }
>         return 0;
> @@ -286,8 +285,7 @@ static int drm_pci_agp_init(struct drm_device *dev)
>  static void drm_pci_agp_destroy(struct drm_device *dev)
>  {
>         if (drm_core_has_AGP(dev) && dev->agp) {
> -               if (drm_core_has_MTRR(dev))
> -                       arch_phys_wc_del(dev->agp->agp_mtrr);
> +               arch_phys_wc_del(dev->agp->agp_mtrr);
>                 drm_agp_clear(dev);
>                 drm_agp_destroy(dev->agp);
>                 dev->agp = NULL;
> diff --git a/drivers/gpu/drm/drm_vm.c b/drivers/gpu/drm/drm_vm.c
> index feb2003..b5c5af7 100644
> --- a/drivers/gpu/drm/drm_vm.c
> +++ b/drivers/gpu/drm/drm_vm.c
> @@ -251,8 +251,7 @@ static void drm_vm_shm_close(struct vm_area_struct *vma)
>                         switch (map->type) {
>                         case _DRM_REGISTERS:
>                         case _DRM_FRAME_BUFFER:
> -                               if (drm_core_has_MTRR(dev))
> -                                       arch_phys_wc_del(map->mtrr);
> +                               arch_phys_wc_del(map->mtrr);
>                                 iounmap(map->handle);
>                                 break;
>                         case _DRM_SHM:
> diff --git a/drivers/gpu/drm/i810/i810_drv.c b/drivers/gpu/drm/i810/i810_drv.c
> index d85c05b..d8180d2 100644
> --- a/drivers/gpu/drm/i810/i810_drv.c
> +++ b/drivers/gpu/drm/i810/i810_drv.c
> @@ -57,7 +57,7 @@ static const struct file_operations i810_driver_fops = {
>
>  static struct drm_driver driver = {
>         .driver_features =
> -           DRIVER_USE_AGP | DRIVER_REQUIRE_AGP | DRIVER_USE_MTRR |
> +           DRIVER_USE_AGP | DRIVER_REQUIRE_AGP |
>             DRIVER_HAVE_DMA,
>         .dev_priv_size = sizeof(drm_i810_buf_priv_t),
>         .load = i810_driver_load,
> diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> index 9411a74..eec47bd 100644
> --- a/drivers/gpu/drm/i915/i915_drv.c
> +++ b/drivers/gpu/drm/i915/i915_drv.c
> @@ -1006,7 +1006,7 @@ static struct drm_driver driver = {
>          * deal with them for Intel hardware.
>          */
>         .driver_features =
> -           DRIVER_USE_AGP | DRIVER_REQUIRE_AGP | /* DRIVER_USE_MTRR |*/
> +           DRIVER_USE_AGP | DRIVER_REQUIRE_AGP |
>             DRIVER_HAVE_IRQ | DRIVER_IRQ_SHARED | DRIVER_GEM | DRIVER_PRIME,
>         .load = i915_driver_load,
>         .unload = i915_driver_unload,
> diff --git a/drivers/gpu/drm/mga/mga_drv.c b/drivers/gpu/drm/mga/mga_drv.c
> index fe71e1e..6b1a87c 100644
> --- a/drivers/gpu/drm/mga/mga_drv.c
> +++ b/drivers/gpu/drm/mga/mga_drv.c
> @@ -58,7 +58,7 @@ static const struct file_operations mga_driver_fops = {
>
>  static struct drm_driver driver = {
>         .driver_features =
> -           DRIVER_USE_AGP | DRIVER_USE_MTRR | DRIVER_PCI_DMA |
> +           DRIVER_USE_AGP | DRIVER_PCI_DMA |
>             DRIVER_HAVE_DMA | DRIVER_HAVE_IRQ | DRIVER_IRQ_SHARED,
>         .dev_priv_size = sizeof(drm_mga_buf_priv_t),
>         .load = mga_driver_load,
> diff --git a/drivers/gpu/drm/mgag200/mgag200_drv.c b/drivers/gpu/drm/mgag200/mgag200_drv.c
> index b570127..fcce7b2 100644
> --- a/drivers/gpu/drm/mgag200/mgag200_drv.c
> +++ b/drivers/gpu/drm/mgag200/mgag200_drv.c
> @@ -88,7 +88,7 @@ static const struct file_operations mgag200_driver_fops = {
>  };
>
>  static struct drm_driver driver = {
> -       .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_USE_MTRR,
> +       .driver_features = DRIVER_GEM | DRIVER_MODESET,
>         .load = mgag200_driver_load,
>         .unload = mgag200_driver_unload,
>         .fops = &mgag200_driver_fops,
> diff --git a/drivers/gpu/drm/r128/r128_drv.c b/drivers/gpu/drm/r128/r128_drv.c
> index c2338cb..5bd307c 100644
> --- a/drivers/gpu/drm/r128/r128_drv.c
> +++ b/drivers/gpu/drm/r128/r128_drv.c
> @@ -56,7 +56,7 @@ static const struct file_operations r128_driver_fops = {
>
>  static struct drm_driver driver = {
>         .driver_features =
> -           DRIVER_USE_AGP | DRIVER_USE_MTRR | DRIVER_PCI_DMA | DRIVER_SG |
> +           DRIVER_USE_AGP | DRIVER_PCI_DMA | DRIVER_SG |
>             DRIVER_HAVE_DMA | DRIVER_HAVE_IRQ | DRIVER_IRQ_SHARED,
>         .dev_priv_size = sizeof(drm_r128_buf_priv_t),
>         .load = r128_driver_load,
> diff --git a/drivers/gpu/drm/radeon/radeon_drv.c b/drivers/gpu/drm/radeon/radeon_drv.c
> index 3e52331..1f93dd5 100644
> --- a/drivers/gpu/drm/radeon/radeon_drv.c
> +++ b/drivers/gpu/drm/radeon/radeon_drv.c
> @@ -275,7 +275,7 @@ static const struct file_operations radeon_driver_old_fops = {
>
>  static struct drm_driver driver_old = {
>         .driver_features =
> -           DRIVER_USE_AGP | DRIVER_USE_MTRR | DRIVER_PCI_DMA | DRIVER_SG |
> +           DRIVER_USE_AGP | DRIVER_PCI_DMA | DRIVER_SG |
>             DRIVER_HAVE_IRQ | DRIVER_HAVE_DMA | DRIVER_IRQ_SHARED,
>         .dev_priv_size = sizeof(drm_radeon_buf_priv_t),
>         .load = radeon_driver_load,
> @@ -382,7 +382,7 @@ static const struct file_operations radeon_driver_kms_fops = {
>
>  static struct drm_driver kms_driver = {
>         .driver_features =
> -           DRIVER_USE_AGP | DRIVER_USE_MTRR |
> +           DRIVER_USE_AGP |
>             DRIVER_HAVE_IRQ | DRIVER_IRQ_SHARED | DRIVER_GEM |
>             DRIVER_PRIME,
>         .dev_priv_size = 0,
> diff --git a/drivers/gpu/drm/savage/savage_drv.c b/drivers/gpu/drm/savage/savage_drv.c
> index 9135c8b..3c03021 100644
> --- a/drivers/gpu/drm/savage/savage_drv.c
> +++ b/drivers/gpu/drm/savage/savage_drv.c
> @@ -50,7 +50,7 @@ static const struct file_operations savage_driver_fops = {
>
>  static struct drm_driver driver = {
>         .driver_features =
> -           DRIVER_USE_AGP | DRIVER_USE_MTRR | DRIVER_HAVE_DMA | DRIVER_PCI_DMA,
> +           DRIVER_USE_AGP | DRIVER_HAVE_DMA | DRIVER_PCI_DMA,
>         .dev_priv_size = sizeof(drm_savage_buf_priv_t),
>         .load = savage_driver_load,
>         .firstopen = savage_driver_firstopen,
> diff --git a/drivers/gpu/drm/sis/sis_drv.c b/drivers/gpu/drm/sis/sis_drv.c
> index b88b2d3..4383b74 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,
> diff --git a/drivers/gpu/drm/tdfx/tdfx_drv.c b/drivers/gpu/drm/tdfx/tdfx_drv.c
> index 951ec13..3492ca5 100644
> --- a/drivers/gpu/drm/tdfx/tdfx_drv.c
> +++ b/drivers/gpu/drm/tdfx/tdfx_drv.c
> @@ -55,7 +55,6 @@ static const struct file_operations tdfx_driver_fops = {
>  };
>
>  static struct drm_driver driver = {
> -       .driver_features = DRIVER_USE_MTRR,
>         .fops = &tdfx_driver_fops,
>         .name = DRIVER_NAME,
>         .desc = DRIVER_DESC,
> diff --git a/drivers/gpu/drm/via/via_drv.c b/drivers/gpu/drm/via/via_drv.c
> index 4487999..92684a9 100644
> --- a/drivers/gpu/drm/via/via_drv.c
> +++ b/drivers/gpu/drm/via/via_drv.c
> @@ -72,7 +72,7 @@ static const struct file_operations via_driver_fops = {
>
>  static struct drm_driver driver = {
>         .driver_features =
> -           DRIVER_USE_AGP | DRIVER_USE_MTRR | DRIVER_HAVE_IRQ |
> +           DRIVER_USE_AGP | DRIVER_HAVE_IRQ |
>             DRIVER_IRQ_SHARED,
>         .load = via_driver_load,
>         .unload = via_driver_unload,
> diff --git a/include/drm/drmP.h b/include/drm/drmP.h
> index 914055e..5b9462d 100644
> --- a/include/drm/drmP.h
> +++ b/include/drm/drmP.h
> @@ -76,7 +76,6 @@
>  #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;
>
> @@ -141,7 +140,6 @@ 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
> @@ -1219,15 +1217,6 @@ static inline int drm_core_has_AGP(struct drm_device *dev)
>  #define drm_core_has_AGP(dev) (0)
>  #endif
>
> -#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();
> --
> 1.8.3.2
>

Patch
diff mbox

diff --git a/drivers/gpu/drm/ast/ast_drv.c b/drivers/gpu/drm/ast/ast_drv.c
index 60f1ce3..32e270d 100644
--- a/drivers/gpu/drm/ast/ast_drv.c
+++ b/drivers/gpu/drm/ast/ast_drv.c
@@ -197,7 +197,7 @@  static const struct file_operations ast_fops = {
 };
 
 static struct drm_driver driver = {
-	.driver_features = DRIVER_USE_MTRR | DRIVER_MODESET | DRIVER_GEM,
+	.driver_features = DRIVER_MODESET | DRIVER_GEM,
 	.dev_priv_size = 0,
 
 	.load = ast_driver_load,
diff --git a/drivers/gpu/drm/cirrus/cirrus_drv.c b/drivers/gpu/drm/cirrus/cirrus_drv.c
index dd9c908..138364d 100644
--- a/drivers/gpu/drm/cirrus/cirrus_drv.c
+++ b/drivers/gpu/drm/cirrus/cirrus_drv.c
@@ -87,7 +87,7 @@  static const struct file_operations cirrus_driver_fops = {
 #endif
 };
 static struct drm_driver driver = {
-	.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_USE_MTRR,
+	.driver_features = DRIVER_MODESET | DRIVER_GEM,
 	.load = cirrus_driver_load,
 	.unload = cirrus_driver_unload,
 	.fops = &cirrus_driver_fops,
diff --git a/drivers/gpu/drm/drm_bufs.c b/drivers/gpu/drm/drm_bufs.c
index 5f73f0a..f63133b 100644
--- a/drivers/gpu/drm/drm_bufs.c
+++ b/drivers/gpu/drm/drm_bufs.c
@@ -207,12 +207,10 @@  static int drm_addmap_core(struct drm_device * dev, resource_size_t offset,
 			return 0;
 		}
 
-		if (drm_core_has_MTRR(dev)) {
-			if (map->type == _DRM_FRAME_BUFFER ||
-			    (map->flags & _DRM_WRITE_COMBINING)) {
-				map->mtrr =
-					arch_phys_wc_add(map->offset, map->size);
-			}
+		if (map->type == _DRM_FRAME_BUFFER ||
+		    (map->flags & _DRM_WRITE_COMBINING)) {
+			map->mtrr =
+				arch_phys_wc_add(map->offset, map->size);
 		}
 		if (map->type == _DRM_REGISTERS) {
 			if (map->flags & _DRM_WRITE_COMBINING)
@@ -464,8 +462,7 @@  int drm_rmmap_locked(struct drm_device *dev, struct drm_local_map *map)
 		iounmap(map->handle);
 		/* FALLTHROUGH */
 	case _DRM_FRAME_BUFFER:
-		if (drm_core_has_MTRR(dev))
-			arch_phys_wc_del(map->mtrr);
+		arch_phys_wc_del(map->mtrr);
 		break;
 	case _DRM_SHM:
 		vfree(map->handle);
diff --git a/drivers/gpu/drm/drm_pci.c b/drivers/gpu/drm/drm_pci.c
index 0f54ad8..3fca2db 100644
--- a/drivers/gpu/drm/drm_pci.c
+++ b/drivers/gpu/drm/drm_pci.c
@@ -272,12 +272,11 @@  static int drm_pci_agp_init(struct drm_device *dev)
 			DRM_ERROR("Cannot initialize the agpgart module.\n");
 			return -EINVAL;
 		}
-		if (drm_core_has_MTRR(dev)) {
-			if (dev->agp)
-				dev->agp->agp_mtrr = arch_phys_wc_add(
-					dev->agp->agp_info.aper_base,
-					dev->agp->agp_info.aper_size *
-					1024 * 1024);
+		if (dev->agp) {
+			dev->agp->agp_mtrr = arch_phys_wc_add(
+				dev->agp->agp_info.aper_base,
+				dev->agp->agp_info.aper_size *
+				1024 * 1024);
 		}
 	}
 	return 0;
@@ -286,8 +285,7 @@  static int drm_pci_agp_init(struct drm_device *dev)
 static void drm_pci_agp_destroy(struct drm_device *dev)
 {
 	if (drm_core_has_AGP(dev) && dev->agp) {
-		if (drm_core_has_MTRR(dev))
-			arch_phys_wc_del(dev->agp->agp_mtrr);
+		arch_phys_wc_del(dev->agp->agp_mtrr);
 		drm_agp_clear(dev);
 		drm_agp_destroy(dev->agp);
 		dev->agp = NULL;
diff --git a/drivers/gpu/drm/drm_vm.c b/drivers/gpu/drm/drm_vm.c
index feb2003..b5c5af7 100644
--- a/drivers/gpu/drm/drm_vm.c
+++ b/drivers/gpu/drm/drm_vm.c
@@ -251,8 +251,7 @@  static void drm_vm_shm_close(struct vm_area_struct *vma)
 			switch (map->type) {
 			case _DRM_REGISTERS:
 			case _DRM_FRAME_BUFFER:
-				if (drm_core_has_MTRR(dev))
-					arch_phys_wc_del(map->mtrr);
+				arch_phys_wc_del(map->mtrr);
 				iounmap(map->handle);
 				break;
 			case _DRM_SHM:
diff --git a/drivers/gpu/drm/i810/i810_drv.c b/drivers/gpu/drm/i810/i810_drv.c
index d85c05b..d8180d2 100644
--- a/drivers/gpu/drm/i810/i810_drv.c
+++ b/drivers/gpu/drm/i810/i810_drv.c
@@ -57,7 +57,7 @@  static const struct file_operations i810_driver_fops = {
 
 static struct drm_driver driver = {
 	.driver_features =
-	    DRIVER_USE_AGP | DRIVER_REQUIRE_AGP | DRIVER_USE_MTRR |
+	    DRIVER_USE_AGP | DRIVER_REQUIRE_AGP |
 	    DRIVER_HAVE_DMA,
 	.dev_priv_size = sizeof(drm_i810_buf_priv_t),
 	.load = i810_driver_load,
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 9411a74..eec47bd 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1006,7 +1006,7 @@  static struct drm_driver driver = {
 	 * deal with them for Intel hardware.
 	 */
 	.driver_features =
-	    DRIVER_USE_AGP | DRIVER_REQUIRE_AGP | /* DRIVER_USE_MTRR |*/
+	    DRIVER_USE_AGP | DRIVER_REQUIRE_AGP |
 	    DRIVER_HAVE_IRQ | DRIVER_IRQ_SHARED | DRIVER_GEM | DRIVER_PRIME,
 	.load = i915_driver_load,
 	.unload = i915_driver_unload,
diff --git a/drivers/gpu/drm/mga/mga_drv.c b/drivers/gpu/drm/mga/mga_drv.c
index fe71e1e..6b1a87c 100644
--- a/drivers/gpu/drm/mga/mga_drv.c
+++ b/drivers/gpu/drm/mga/mga_drv.c
@@ -58,7 +58,7 @@  static const struct file_operations mga_driver_fops = {
 
 static struct drm_driver driver = {
 	.driver_features =
-	    DRIVER_USE_AGP | DRIVER_USE_MTRR | DRIVER_PCI_DMA |
+	    DRIVER_USE_AGP | DRIVER_PCI_DMA |
 	    DRIVER_HAVE_DMA | DRIVER_HAVE_IRQ | DRIVER_IRQ_SHARED,
 	.dev_priv_size = sizeof(drm_mga_buf_priv_t),
 	.load = mga_driver_load,
diff --git a/drivers/gpu/drm/mgag200/mgag200_drv.c b/drivers/gpu/drm/mgag200/mgag200_drv.c
index b570127..fcce7b2 100644
--- a/drivers/gpu/drm/mgag200/mgag200_drv.c
+++ b/drivers/gpu/drm/mgag200/mgag200_drv.c
@@ -88,7 +88,7 @@  static const struct file_operations mgag200_driver_fops = {
 };
 
 static struct drm_driver driver = {
-	.driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_USE_MTRR,
+	.driver_features = DRIVER_GEM | DRIVER_MODESET,
 	.load = mgag200_driver_load,
 	.unload = mgag200_driver_unload,
 	.fops = &mgag200_driver_fops,
diff --git a/drivers/gpu/drm/r128/r128_drv.c b/drivers/gpu/drm/r128/r128_drv.c
index c2338cb..5bd307c 100644
--- a/drivers/gpu/drm/r128/r128_drv.c
+++ b/drivers/gpu/drm/r128/r128_drv.c
@@ -56,7 +56,7 @@  static const struct file_operations r128_driver_fops = {
 
 static struct drm_driver driver = {
 	.driver_features =
-	    DRIVER_USE_AGP | DRIVER_USE_MTRR | DRIVER_PCI_DMA | DRIVER_SG |
+	    DRIVER_USE_AGP | DRIVER_PCI_DMA | DRIVER_SG |
 	    DRIVER_HAVE_DMA | DRIVER_HAVE_IRQ | DRIVER_IRQ_SHARED,
 	.dev_priv_size = sizeof(drm_r128_buf_priv_t),
 	.load = r128_driver_load,
diff --git a/drivers/gpu/drm/radeon/radeon_drv.c b/drivers/gpu/drm/radeon/radeon_drv.c
index 3e52331..1f93dd5 100644
--- a/drivers/gpu/drm/radeon/radeon_drv.c
+++ b/drivers/gpu/drm/radeon/radeon_drv.c
@@ -275,7 +275,7 @@  static const struct file_operations radeon_driver_old_fops = {
 
 static struct drm_driver driver_old = {
 	.driver_features =
-	    DRIVER_USE_AGP | DRIVER_USE_MTRR | DRIVER_PCI_DMA | DRIVER_SG |
+	    DRIVER_USE_AGP | DRIVER_PCI_DMA | DRIVER_SG |
 	    DRIVER_HAVE_IRQ | DRIVER_HAVE_DMA | DRIVER_IRQ_SHARED,
 	.dev_priv_size = sizeof(drm_radeon_buf_priv_t),
 	.load = radeon_driver_load,
@@ -382,7 +382,7 @@  static const struct file_operations radeon_driver_kms_fops = {
 
 static struct drm_driver kms_driver = {
 	.driver_features =
-	    DRIVER_USE_AGP | DRIVER_USE_MTRR | 
+	    DRIVER_USE_AGP |
 	    DRIVER_HAVE_IRQ | DRIVER_IRQ_SHARED | DRIVER_GEM |
 	    DRIVER_PRIME,
 	.dev_priv_size = 0,
diff --git a/drivers/gpu/drm/savage/savage_drv.c b/drivers/gpu/drm/savage/savage_drv.c
index 9135c8b..3c03021 100644
--- a/drivers/gpu/drm/savage/savage_drv.c
+++ b/drivers/gpu/drm/savage/savage_drv.c
@@ -50,7 +50,7 @@  static const struct file_operations savage_driver_fops = {
 
 static struct drm_driver driver = {
 	.driver_features =
-	    DRIVER_USE_AGP | DRIVER_USE_MTRR | DRIVER_HAVE_DMA | DRIVER_PCI_DMA,
+	    DRIVER_USE_AGP | DRIVER_HAVE_DMA | DRIVER_PCI_DMA,
 	.dev_priv_size = sizeof(drm_savage_buf_priv_t),
 	.load = savage_driver_load,
 	.firstopen = savage_driver_firstopen,
diff --git a/drivers/gpu/drm/sis/sis_drv.c b/drivers/gpu/drm/sis/sis_drv.c
index b88b2d3..4383b74 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,
diff --git a/drivers/gpu/drm/tdfx/tdfx_drv.c b/drivers/gpu/drm/tdfx/tdfx_drv.c
index 951ec13..3492ca5 100644
--- a/drivers/gpu/drm/tdfx/tdfx_drv.c
+++ b/drivers/gpu/drm/tdfx/tdfx_drv.c
@@ -55,7 +55,6 @@  static const struct file_operations tdfx_driver_fops = {
 };
 
 static struct drm_driver driver = {
-	.driver_features = DRIVER_USE_MTRR,
 	.fops = &tdfx_driver_fops,
 	.name = DRIVER_NAME,
 	.desc = DRIVER_DESC,
diff --git a/drivers/gpu/drm/via/via_drv.c b/drivers/gpu/drm/via/via_drv.c
index 4487999..92684a9 100644
--- a/drivers/gpu/drm/via/via_drv.c
+++ b/drivers/gpu/drm/via/via_drv.c
@@ -72,7 +72,7 @@  static const struct file_operations via_driver_fops = {
 
 static struct drm_driver driver = {
 	.driver_features =
-	    DRIVER_USE_AGP | DRIVER_USE_MTRR | DRIVER_HAVE_IRQ |
+	    DRIVER_USE_AGP | DRIVER_HAVE_IRQ |
 	    DRIVER_IRQ_SHARED,
 	.load = via_driver_load,
 	.unload = via_driver_unload,
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index 914055e..5b9462d 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -76,7 +76,6 @@ 
 #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;
 
@@ -141,7 +140,6 @@  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
@@ -1219,15 +1217,6 @@  static inline int drm_core_has_AGP(struct drm_device *dev)
 #define drm_core_has_AGP(dev) (0)
 #endif
 
-#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();