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>

diff --git a/drivers/gpu/drm/ast/ast_drv.c b/drivers/gpu/drm/ast/ast_drv.c
index 60f1ce3998c3da01ff680defe5fb9f8644faf60b..32e270dc714eb036a325b1d4999e18e6d7c1e11b 100644 (file)
--- 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 dd9c908ab3fc241b7e068b78168d69b8361461ea..138364d917824f8ad4f7f771ad7f68a6cbb35aba 100644 (file)
--- 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 5f73f0af6125f66283a19e61d0029e8fea580d02..f63133b0a9ab9a7478f89b937139a7f0f5ea57c7 100644 (file)
--- 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 0f54ad8a9ced99f888afb054328d1535bf6308a0..3fca2db1c40cb4c68d1e65bb3eb9bbc25e07e5bd 100644 (file)
--- 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 feb20035b2c44d08ac217c0b48d40967f70f6463..b5c5af7328df200a2ff119bafeb92664bb1738cb 100644 (file)
--- 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 d85c05b4877d17847e12d9ede6695f90a45501d6..d8180d22ceddb38965e3c6f59367d75a8421dff2 100644 (file)
--- 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 9411a745adafec8da220288dbfdd60cf7e700e35..eec47bd0035301b6c41a4436e3a7c972f50d0835 100644 (file)
--- 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 fe71e1e44e4830d6c24c0fb3f1f11eb8d4c5baf5..6b1a87c8aac52f6f103385a7302713e719a3a1b3 100644 (file)
--- 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 b570127ae3b208beeb2147f1a0558b89e94d8d0c..fcce7b2f80110d2c9a2907b02210edc141f1aab9 100644 (file)
--- 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 c2338cbc56ad9699fc27b1f382d105ebd4a4bcc1..5bd307cd8da129316db121ad0e41736a10338322 100644 (file)
--- 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 3e52331124de3f4db84a7e78a7458ce9b0975c00..1f93dd50364647cd95f132291d68fcab165dfcbb 100644 (file)
--- 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 9135c8bd6fbc9d22635a4c8794ce9d7029865ebf..3c030216e8888a14078af5d67b26399f7dfbf585 100644 (file)
--- 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 b88b2d3021053527bf2a756493159ef4af9abaff..4383b74a3aa46f480ac3c118e3a113812fdff9de 100644 (file)
--- 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 951ec13e4e5c85a6b89af3094bb8d9d184924aba..3492ca5c46d323b6932ee8d917a00af3544bebf2 100644 (file)
--- 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 448799968a06a3942b003c127e8aab18177be9df..92684a9b7e3414f69cdc76f2d2ef82d286cda734 100644 (file)
--- 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 0ef8e5481e15df48e71096fb15800866fbf3ab44..139d859adf16cf785ed795beee776e0f04231079 100644 (file)
--- 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();