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281856477c
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>
143 lines
4.4 KiB
C
143 lines
4.4 KiB
C
/* mga_drv.c -- Matrox G200/G400 driver -*- linux-c -*-
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* Created: Mon Dec 13 01:56:22 1999 by jhartmann@precisioninsight.com
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*
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* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
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* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Authors:
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* Rickard E. (Rik) Faith <faith@valinux.com>
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* Gareth Hughes <gareth@valinux.com>
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*/
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#include <linux/module.h>
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#include <drm/drmP.h>
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#include <drm/mga_drm.h>
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#include "mga_drv.h"
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#include <drm/drm_pciids.h>
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static int mga_driver_device_is_agp(struct drm_device *dev);
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static struct pci_device_id pciidlist[] = {
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mga_PCI_IDS
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};
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static const struct file_operations mga_driver_fops = {
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.owner = THIS_MODULE,
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.open = drm_open,
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.release = drm_release,
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.unlocked_ioctl = drm_ioctl,
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.mmap = drm_mmap,
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.poll = drm_poll,
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#ifdef CONFIG_COMPAT
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.compat_ioctl = mga_compat_ioctl,
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#endif
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.llseek = noop_llseek,
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};
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static struct drm_driver driver = {
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.driver_features =
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DRIVER_USE_AGP | DRIVER_PCI_DMA |
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DRIVER_HAVE_DMA | DRIVER_HAVE_IRQ | DRIVER_IRQ_SHARED,
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.dev_priv_size = sizeof(drm_mga_buf_priv_t),
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.load = mga_driver_load,
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.unload = mga_driver_unload,
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.lastclose = mga_driver_lastclose,
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.dma_quiescent = mga_driver_dma_quiescent,
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.device_is_agp = mga_driver_device_is_agp,
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.get_vblank_counter = mga_get_vblank_counter,
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.enable_vblank = mga_enable_vblank,
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.disable_vblank = mga_disable_vblank,
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.irq_preinstall = mga_driver_irq_preinstall,
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.irq_postinstall = mga_driver_irq_postinstall,
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.irq_uninstall = mga_driver_irq_uninstall,
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.irq_handler = mga_driver_irq_handler,
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.ioctls = mga_ioctls,
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.dma_ioctl = mga_dma_buffers,
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.fops = &mga_driver_fops,
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.name = DRIVER_NAME,
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.desc = DRIVER_DESC,
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.date = DRIVER_DATE,
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.major = DRIVER_MAJOR,
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.minor = DRIVER_MINOR,
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.patchlevel = DRIVER_PATCHLEVEL,
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};
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static struct pci_driver mga_pci_driver = {
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.name = DRIVER_NAME,
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.id_table = pciidlist,
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};
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static int __init mga_init(void)
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{
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driver.num_ioctls = mga_max_ioctl;
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return drm_pci_init(&driver, &mga_pci_driver);
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}
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static void __exit mga_exit(void)
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{
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drm_pci_exit(&driver, &mga_pci_driver);
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}
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module_init(mga_init);
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module_exit(mga_exit);
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MODULE_AUTHOR(DRIVER_AUTHOR);
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL and additional rights");
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/**
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* Determine if the device really is AGP or not.
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*
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* In addition to the usual tests performed by \c drm_device_is_agp, this
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* function detects PCI G450 cards that appear to the system exactly like
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* AGP G450 cards.
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*
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* \param dev The device to be tested.
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*
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* \returns
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* If the device is a PCI G450, zero is returned. Otherwise 2 is returned.
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*/
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static int mga_driver_device_is_agp(struct drm_device *dev)
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{
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const struct pci_dev *const pdev = dev->pdev;
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/* There are PCI versions of the G450. These cards have the
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* same PCI ID as the AGP G450, but have an additional PCI-to-PCI
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* bridge chip. We detect these cards, which are not currently
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* supported by this driver, by looking at the device ID of the
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* bus the "card" is on. If vendor is 0x3388 (Hint Corp) and the
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* device is 0x0021 (HB6 Universal PCI-PCI bridge), we reject the
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* device.
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*/
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if ((pdev->device == 0x0525) && pdev->bus->self
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&& (pdev->bus->self->vendor == 0x3388)
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&& (pdev->bus->self->device == 0x0021)) {
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return 0;
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}
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return 2;
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}
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