81 lines
1.8 KiB
C
81 lines
1.8 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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struct intel_panic {
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struct page **pages;
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int page;
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void *vaddr;
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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->vaddr) {
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drm_clflush_virt_range(panic->vaddr, PAGE_SIZE);
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kunmap_local(panic->vaddr);
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panic->vaddr = NULL;
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}
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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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xe_panic_kunmap(panic);
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panic->page = new_page;
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panic->vaddr = ttm_bo_kmap_try_from_panic(&bo->ttm,
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panic->page);
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}
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if (panic->vaddr) {
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u32 *pix = panic->vaddr + offset;
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*pix = color;
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}
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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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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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panic->page = -1;
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}
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