mirror of
https://github.com/torvalds/linux.git
synced 2024-11-25 13:41:51 +00:00
913b2cb727
This commit fixes DRM failures on Xen PV systems that were introduced in v4.17 by the following commits:82626363drm: add func to get max iomem address v2fd5fd480drm/amdgpu: only enable swiotlb alloc when need v21bc3d3ccdrm/radeon: only enable swiotlb path when need v2 The introduction of ->need_swiotlb to the ttm_dma_populate() conditionals in the radeon and amdgpu device drivers causes Gnome to immediately crash on Xen PV systems, returning the user to the login screen. The following kernel errors get logged: [ 28.554259] radeon_dp_aux_transfer_native: 200 callbacks suppressed [ 31.219821] radeon 0000:01:00.0: swiotlb buffer is full (sz: 2097152 bytes) [ 31.220030] [drm:radeon_gem_object_create [radeon]] *ERROR* Failed to allocate GEM object (16384000, 2, 4096, -14) [ 31.226109] radeon 0000:01:00.0: swiotlb buffer is full (sz: 2097152 bytes) [ 31.226300] [drm:radeon_gem_object_create [radeon]] *ERROR* Failed to allocate GEM object (16384000, 2, 4096, -14) [ 31.300734] gnome-shell[1935]: segfault at 88 ip 00007f39151cd904 sp 00007ffc97611ad8 error 4 in libmutter-cogl.so[7f3915178000+aa000] [ 31.300745] Code: 5f c3 0f 1f 40 00 48 8b 47 78 48 8b 40 40 ff e0 66 0f 1f 44 00 00 48 8b 47 78 48 8b 40 48 ff e0 66 0f 1f 44 00 00 48 8b 47 78 <48> 8b 80 88 00 00 00 ff e0 0f 1f 00 48 8b 47 78 48 8b 40 68 ff e0 [ 38.193302] radeon_dp_aux_transfer_native: 116 callbacks suppressed [ 40.009317] radeon 0000:01:00.0: swiotlb buffer is full (sz: 2097152 bytes) [ 40.009488] [drm:radeon_gem_object_create [radeon]] *ERROR* Failed to allocate GEM object (16384000, 2, 4096, -14) [ 40.015114] radeon 0000:01:00.0: swiotlb buffer is full (sz: 2097152 bytes) [ 40.015297] [drm:radeon_gem_object_create [radeon]] *ERROR* Failed to allocate GEM object (16384000, 2, 4096, -14) [ 40.028302] gnome-shell[2431]: segfault at 2dadf40 ip 0000000002dadf40 sp 00007ffcd24ea5f8 error 15 [ 40.028306] Code: 20 6e 31 00 00 00 00 00 00 00 00 37 e3 3d 2d 7f 00 00 80 f4 e6 3d 2d 7f 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <00> 00 00 00 00 00 00 00 c1 00 00 00 00 00 00 00 80 e1 d2 03 00 00 This commit renames drm_get_max_iomem() to drm_need_swiotlb(), adds a xen_pv_domain() check to it, and moves the bit shifting comparison that always follows its usage into the function (simplifying the drm driver code). Signed-off-by: Michael D Labriola <michael.d.labriola@gmail.com> Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Christian König <christian.koenig@amd.com> Link: https://patchwork.freedesktop.org/patch/286987/
74 lines
2.9 KiB
C
74 lines
2.9 KiB
C
/**************************************************************************
|
|
*
|
|
* Copyright 2009 Red Hat Inc.
|
|
* All Rights Reserved.
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a
|
|
* copy of this software and associated documentation files (the
|
|
* "Software"), to deal in the Software without restriction, including
|
|
* without limitation the rights to use, copy, modify, merge, publish,
|
|
* distribute, sub license, and/or sell copies of the Software, and to
|
|
* permit persons to whom the Software is furnished to do so, subject to
|
|
* the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice (including the
|
|
* next paragraph) shall be included in all copies or substantial portions
|
|
* of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
|
|
* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
|
|
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
|
|
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
|
|
* USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
*
|
|
*
|
|
**************************************************************************/
|
|
/*
|
|
* Authors:
|
|
* Dave Airlie <airlied@redhat.com>
|
|
*/
|
|
|
|
#ifndef _DRM_CACHE_H_
|
|
#define _DRM_CACHE_H_
|
|
|
|
#include <linux/scatterlist.h>
|
|
|
|
void drm_clflush_pages(struct page *pages[], unsigned long num_pages);
|
|
void drm_clflush_sg(struct sg_table *st);
|
|
void drm_clflush_virt_range(void *addr, unsigned long length);
|
|
bool drm_need_swiotlb(int dma_bits);
|
|
|
|
|
|
static inline bool drm_arch_can_wc_memory(void)
|
|
{
|
|
#if defined(CONFIG_PPC) && !defined(CONFIG_NOT_COHERENT_CACHE)
|
|
return false;
|
|
#elif defined(CONFIG_MIPS) && defined(CONFIG_CPU_LOONGSON3)
|
|
return false;
|
|
#elif defined(CONFIG_ARM) || defined(CONFIG_ARM64)
|
|
/*
|
|
* The DRM driver stack is designed to work with cache coherent devices
|
|
* only, but permits an optimization to be enabled in some cases, where
|
|
* for some buffers, both the CPU and the GPU use uncached mappings,
|
|
* removing the need for DMA snooping and allocation in the CPU caches.
|
|
*
|
|
* The use of uncached GPU mappings relies on the correct implementation
|
|
* of the PCIe NoSnoop TLP attribute by the platform, otherwise the GPU
|
|
* will use cached mappings nonetheless. On x86 platforms, this does not
|
|
* seem to matter, as uncached CPU mappings will snoop the caches in any
|
|
* case. However, on ARM and arm64, enabling this optimization on a
|
|
* platform where NoSnoop is ignored results in loss of coherency, which
|
|
* breaks correct operation of the device. Since we have no way of
|
|
* detecting whether NoSnoop works or not, just disable this
|
|
* optimization entirely for ARM and arm64.
|
|
*/
|
|
return false;
|
|
#else
|
|
return true;
|
|
#endif
|
|
}
|
|
|
|
#endif
|