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// SPDX-License-Identifier: MIT
/* Copyright © 2025 Intel Corporation */
#include <drm/drm_cache.h>
#include <drm/drm_panic.h>
#include "intel_display_types.h"
#include "intel_fb.h"
#include "intel_panic.h"
#include "xe_bo.h"
struct intel_panic {
struct page **pages;
int page;
void *vaddr;
};
static void xe_panic_kunmap(struct intel_panic *panic)
{
if (panic->vaddr) {
drm_clflush_virt_range(panic->vaddr, PAGE_SIZE);
kunmap_local(panic->vaddr);
panic->vaddr = NULL;
}
}
/*
* The scanout buffer pages are not mapped, so for each pixel,
* use kmap_local_page_try_from_panic() to map the page, and write the pixel.
* Try to keep the map from the previous pixel, to avoid too much map/unmap.
*/
static void xe_panic_page_set_pixel(struct drm_scanout_buffer *sb, unsigned int x,
unsigned int y, u32 color)
{
struct intel_framebuffer *fb = (struct intel_framebuffer *)sb->private;
struct intel_panic *panic = fb->panic;
struct xe_bo *bo = gem_to_xe_bo(intel_fb_bo(&fb->base));
unsigned int new_page;
unsigned int offset;
if (fb->panic_tiling)
offset = fb->panic_tiling(sb->width, x, y);
else
offset = y * sb->pitch[0] + x * sb->format->cpp[0];
new_page = offset >> PAGE_SHIFT;
offset = offset % PAGE_SIZE;
if (new_page != panic->page) {
xe_panic_kunmap(panic);
panic->page = new_page;
panic->vaddr = ttm_bo_kmap_try_from_panic(&bo->ttm,
panic->page);
}
if (panic->vaddr) {
u32 *pix = panic->vaddr + offset;
*pix = color;
}
}
struct intel_panic *intel_panic_alloc(void)
{
struct intel_panic *panic;
panic = kzalloc(sizeof(*panic), GFP_KERNEL);
return panic;
}
int intel_panic_setup(struct intel_panic *panic, struct drm_scanout_buffer *sb)
{
panic->page = -1;
sb->set_pixel = xe_panic_page_set_pixel;
return 0;
}
void intel_panic_finish(struct intel_panic *panic)
{
xe_panic_kunmap(panic);
panic->page = -1;
}
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