From: Bruce Chang Date: Wed, 13 Nov 2019 23:11:04 +0000 (-0800) Subject: drm/i915: Avoid atomic context for error capture X-Git-Tag: v5.6-rc1~34^2~21^2~361 X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=48715f700174;p=linux-block.git drm/i915: Avoid atomic context for error capture io_mapping_map_atomic/kmap_atomic are occasionally taken in error capture (if there is no aperture preallocated for the use of error capture), but the error capture and compression routines are now run in normal context: <3> [113.316247] BUG: sleeping function called from invalid context at mm/page_alloc.c:4653 <3> [113.318190] in_atomic(): 1, irqs_disabled(): 0, pid: 678, name: debugfs_test <4> [113.319900] no locks held by debugfs_test/678. <3> [113.321002] Preemption disabled at: <4> [113.321130] [] i915_error_object_create+0x494/0x610 [i915] <4> [113.327259] Call Trace: <4> [113.327871] dump_stack+0x67/0x9b <4> [113.328683] ___might_sleep+0x167/0x250 <4> [113.329618] __alloc_pages_nodemask+0x26b/0x1110 <4> [113.334614] pool_alloc.constprop.19+0x14/0x60 [i915] <4> [113.335951] compress_page+0x7c/0x100 [i915] <4> [113.337110] i915_error_object_create+0x4bd/0x610 [i915] <4> [113.338515] i915_capture_gpu_state+0x384/0x1680 [i915] However, it is not a good idea to run the slow compression inside atomic context, so we choose not to. Fixes: 895d8ebeaa924 ("drm/i915: error capture with no ggtt slot") Signed-off-by: Bruce Chang Reviewed-by: Brian Welty Reviewed-by: Chris Wilson Signed-off-by: Chris Wilson Link: https://patchwork.freedesktop.org/patch/msgid/20191113231104.24208-1-yu.bruce.chang@intel.com --- diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c index 1f2f266f26af..7118ecb7f144 100644 --- a/drivers/gpu/drm/i915/i915_gpu_error.c +++ b/drivers/gpu/drm/i915/i915_gpu_error.c @@ -1029,9 +1029,9 @@ i915_error_object_create(struct drm_i915_private *i915, for_each_sgt_daddr(dma, iter, vma->pages) { void __iomem *s; - s = io_mapping_map_atomic_wc(&mem->iomap, dma); + s = io_mapping_map_wc(&mem->iomap, dma, PAGE_SIZE); ret = compress_page(compress, (void __force *)s, dst); - io_mapping_unmap_atomic(s); + io_mapping_unmap(s); if (ret) break; } @@ -1043,9 +1043,9 @@ i915_error_object_create(struct drm_i915_private *i915, drm_clflush_pages(&page, 1); - s = kmap_atomic(page); + s = kmap(page); ret = compress_page(compress, s, dst); - kunmap_atomic(s); + kunmap(s); drm_clflush_pages(&page, 1);