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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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466e69b8b0
The current enabling of bus mastering in the drm midlayer allows a large race condition under kexec. When a kexec'ed kernel re-enables bus mastering for the GPU, previously setup dma blocks may cause writes to random pieces of memory. On radeon the writeback mechanism can cause these sorts of issues. This patch doesn't fix the problem, but it moves the bus master enable under the individual drivers control so they can move enabling it until later in their load cycle and close the race. Fix for radeon kms driver will be in a follow-up patch. Signed-off-by: Dave Airlie <airlied@redhat.com>
115 lines
3.4 KiB
C
115 lines
3.4 KiB
C
/* r128_drv.c -- ATI Rage 128 driver -*- linux-c -*-
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* Created: Mon Dec 13 09:47:27 1999 by faith@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 "drmP.h"
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#include "drm.h"
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#include "r128_drm.h"
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#include "r128_drv.h"
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#include "drm_pciids.h"
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static struct pci_device_id pciidlist[] = {
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r128_PCI_IDS
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};
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static const struct file_operations r128_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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.fasync = drm_fasync,
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#ifdef CONFIG_COMPAT
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.compat_ioctl = r128_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_USE_MTRR | DRIVER_PCI_DMA | DRIVER_SG |
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DRIVER_HAVE_DMA | DRIVER_HAVE_IRQ | DRIVER_IRQ_SHARED,
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.dev_priv_size = sizeof(drm_r128_buf_priv_t),
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.load = r128_driver_load,
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.preclose = r128_driver_preclose,
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.lastclose = r128_driver_lastclose,
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.get_vblank_counter = r128_get_vblank_counter,
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.enable_vblank = r128_enable_vblank,
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.disable_vblank = r128_disable_vblank,
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.irq_preinstall = r128_driver_irq_preinstall,
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.irq_postinstall = r128_driver_irq_postinstall,
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.irq_uninstall = r128_driver_irq_uninstall,
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.irq_handler = r128_driver_irq_handler,
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.reclaim_buffers = drm_core_reclaim_buffers,
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.ioctls = r128_ioctls,
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.dma_ioctl = r128_cce_buffers,
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.fops = &r128_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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int r128_driver_load(struct drm_device *dev, unsigned long flags)
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{
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pci_set_master(dev->pdev);
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return drm_vblank_init(dev, 1);
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}
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static struct pci_driver r128_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 r128_init(void)
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{
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driver.num_ioctls = r128_max_ioctl;
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return drm_pci_init(&driver, &r128_pci_driver);
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}
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static void __exit r128_exit(void)
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{
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drm_pci_exit(&driver, &r128_pci_driver);
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}
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module_init(r128_init);
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module_exit(r128_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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