1 // SPDX-License-Identifier: MIT 2 /* Copyright © 2025 Intel Corporation */ 3 4 #include <drm/drm_cache.h> 5 #include <drm/drm_panic.h> 6 7 #include "intel_display_types.h" 8 #include "intel_fb.h" 9 #include "intel_panic.h" 10 #include "xe_bo.h" 11 12 struct intel_panic { 13 struct page **pages; 14 int page; 15 void *vaddr; 16 }; 17 18 static void xe_panic_kunmap(struct intel_panic *panic) 19 { 20 if (panic->vaddr) { 21 drm_clflush_virt_range(panic->vaddr, PAGE_SIZE); 22 kunmap_local(panic->vaddr); 23 panic->vaddr = NULL; 24 } 25 } 26 27 /* 28 * The scanout buffer pages are not mapped, so for each pixel, 29 * use kmap_local_page_try_from_panic() to map the page, and write the pixel. 30 * Try to keep the map from the previous pixel, to avoid too much map/unmap. 31 */ 32 static void xe_panic_page_set_pixel(struct drm_scanout_buffer *sb, unsigned int x, 33 unsigned int y, u32 color) 34 { 35 struct intel_framebuffer *fb = (struct intel_framebuffer *)sb->private; 36 struct intel_panic *panic = fb->panic; 37 struct xe_bo *bo = gem_to_xe_bo(intel_fb_bo(&fb->base)); 38 unsigned int new_page; 39 unsigned int offset; 40 41 if (fb->panic_tiling) 42 offset = fb->panic_tiling(sb->width, x, y); 43 else 44 offset = y * sb->pitch[0] + x * sb->format->cpp[0]; 45 46 new_page = offset >> PAGE_SHIFT; 47 offset = offset % PAGE_SIZE; 48 if (new_page != panic->page) { 49 xe_panic_kunmap(panic); 50 panic->page = new_page; 51 panic->vaddr = ttm_bo_kmap_try_from_panic(&bo->ttm, 52 panic->page); 53 } 54 if (panic->vaddr) { 55 u32 *pix = panic->vaddr + offset; 56 *pix = color; 57 } 58 } 59 60 struct intel_panic *intel_panic_alloc(void) 61 { 62 struct intel_panic *panic; 63 64 panic = kzalloc(sizeof(*panic), GFP_KERNEL); 65 66 return panic; 67 } 68 69 int intel_panic_setup(struct intel_panic *panic, struct drm_scanout_buffer *sb) 70 { 71 panic->page = -1; 72 sb->set_pixel = xe_panic_page_set_pixel; 73 return 0; 74 } 75 76 void intel_panic_finish(struct intel_panic *panic) 77 { 78 xe_panic_kunmap(panic); 79 panic->page = -1; 80 } 81