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beaae3c0a4
Add a special path for VRAM using xe_res iterators to ensure a panic screen is shown on VRAM as well. Acked-by: Jocelyn Falempe <jfalempe@redhat.com> Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com> Link: https://lore.kernel.org/r/20251016075701.379023-3-jfalempe@redhat.com Signed-off-by: Maarten Lankhorst <dev@lankhorst.se> Acked-by: Jani Nikula <jani.nikula@linux.intel.com>
103 lines
2.7 KiB
C
103 lines
2.7 KiB
C
// SPDX-License-Identifier: MIT
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/* Copyright © 2025 Intel Corporation */
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#include <drm/drm_cache.h>
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#include <drm/drm_panic.h>
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#include "intel_display_types.h"
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#include "intel_fb.h"
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#include "intel_panic.h"
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#include "xe_bo.h"
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#include "xe_res_cursor.h"
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struct intel_panic {
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struct xe_res_cursor res;
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struct iosys_map vmap;
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int page;
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};
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static void xe_panic_kunmap(struct intel_panic *panic)
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{
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if (!panic->vmap.is_iomem && iosys_map_is_set(&panic->vmap)) {
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drm_clflush_virt_range(panic->vmap.vaddr, PAGE_SIZE);
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kunmap_local(panic->vmap.vaddr);
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}
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iosys_map_clear(&panic->vmap);
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panic->page = -1;
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}
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/*
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* The scanout buffer pages are not mapped, so for each pixel,
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* use kmap_local_page_try_from_panic() to map the page, and write the pixel.
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* Try to keep the map from the previous pixel, to avoid too much map/unmap.
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*/
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static void xe_panic_page_set_pixel(struct drm_scanout_buffer *sb, unsigned int x,
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unsigned int y, u32 color)
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{
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struct intel_framebuffer *fb = (struct intel_framebuffer *)sb->private;
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struct intel_panic *panic = fb->panic;
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struct xe_bo *bo = gem_to_xe_bo(intel_fb_bo(&fb->base));
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unsigned int new_page;
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unsigned int offset;
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if (fb->panic_tiling)
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offset = fb->panic_tiling(sb->width, x, y);
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else
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offset = y * sb->pitch[0] + x * sb->format->cpp[0];
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new_page = offset >> PAGE_SHIFT;
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offset = offset % PAGE_SIZE;
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if (new_page != panic->page) {
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if (xe_bo_is_vram(bo)) {
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/* Display is always mapped on root tile */
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struct xe_vram_region *vram = xe_bo_device(bo)->mem.vram;
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if (panic->page < 0 || new_page < panic->page) {
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xe_res_first(bo->ttm.resource, new_page * PAGE_SIZE,
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bo->ttm.base.size - new_page * PAGE_SIZE, &panic->res);
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} else {
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xe_res_next(&panic->res, PAGE_SIZE * (new_page - panic->page));
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}
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iosys_map_set_vaddr_iomem(&panic->vmap,
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vram->mapping + panic->res.start);
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} else {
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xe_panic_kunmap(panic);
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iosys_map_set_vaddr(&panic->vmap,
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ttm_bo_kmap_try_from_panic(&bo->ttm,
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new_page));
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}
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panic->page = new_page;
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}
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if (iosys_map_is_set(&panic->vmap))
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iosys_map_wr(&panic->vmap, offset, u32, color);
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}
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struct intel_panic *intel_panic_alloc(void)
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{
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struct intel_panic *panic;
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panic = kzalloc(sizeof(*panic), GFP_KERNEL);
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return panic;
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}
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int intel_panic_setup(struct intel_panic *panic, struct drm_scanout_buffer *sb)
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{
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struct intel_framebuffer *fb = (struct intel_framebuffer *)sb->private;
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struct xe_bo *bo = gem_to_xe_bo(intel_fb_bo(&fb->base));
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if (xe_bo_is_vram(bo) && !xe_bo_is_visible_vram(bo))
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return -ENODEV;
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panic->page = -1;
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sb->set_pixel = xe_panic_page_set_pixel;
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return 0;
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}
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void intel_panic_finish(struct intel_panic *panic)
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{
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xe_panic_kunmap(panic);
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}
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