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// SPDX-License-Identifier: MIT
/* Copyright © 2026 Intel Corporation */
#include <drm/drm_cache.h>
#include <drm/drm_panic.h>
#include <drm/intel/display_parent_interface.h>
#include "i915_gem_object.h"
#include "i915_gem_panic.h"
struct intel_panic {
struct page **pages;
int page;
void *vaddr;
unsigned int (*tiling)(unsigned int x, unsigned int y, unsigned int width);
};
static void i915_panic_kunmap(struct intel_panic *panic)
{
if (panic->vaddr) {
drm_clflush_virt_range(panic->vaddr, PAGE_SIZE);
kunmap_local(panic->vaddr);
panic->vaddr = NULL;
}
}
static struct page **i915_gem_object_panic_pages(struct drm_i915_gem_object *obj)
{
unsigned long n_pages = obj->base.size >> PAGE_SHIFT, i;
struct page *page;
struct page **pages;
struct sgt_iter iter;
/* For a 3840x2160 32 bits Framebuffer, this should require ~64K */
pages = kmalloc_objs(*pages, n_pages, GFP_ATOMIC);
if (!pages)
return NULL;
i = 0;
for_each_sgt_page(page, iter, obj->mm.pages)
pages[i++] = page;
return pages;
}
static void i915_gem_object_panic_map_set_pixel(struct drm_scanout_buffer *sb, unsigned int x,
unsigned int y, u32 color)
{
struct intel_panic *panic = sb->private;
unsigned int offset = panic->tiling(sb->width, x, y);
iosys_map_wr(&sb->map[0], offset, u32, color);
}
/*
* 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 i915_gem_object_panic_page_set_pixel(struct drm_scanout_buffer *sb, unsigned int x,
unsigned int y, u32 color)
{
struct intel_panic *panic = sb->private;
unsigned int new_page;
unsigned int offset;
if (panic->tiling)
offset = 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) {
i915_panic_kunmap(panic);
panic->page = new_page;
panic->vaddr =
kmap_local_page_try_from_panic(panic->pages[panic->page]);
}
if (panic->vaddr) {
u32 *pix = panic->vaddr + offset;
*pix = color;
}
}
static struct intel_panic *i915_gem_object_alloc_panic(void)
{
struct intel_panic *panic;
panic = kzalloc_obj(*panic);
return panic;
}
/*
* Setup the gem framebuffer for drm_panic access.
* Use current vaddr if it exists, or setup a list of pages.
* pfn is not supported yet.
*/
static int i915_gem_object_panic_setup(struct intel_panic *panic, struct drm_scanout_buffer *sb,
struct drm_gem_object *_obj,
unsigned int (*tiling)(unsigned int x, unsigned int y, unsigned int width))
{
enum i915_map_type has_type;
struct drm_i915_gem_object *obj = to_intel_bo(_obj);
void *ptr;
sb->private = panic;
ptr = page_unpack_bits(obj->mm.mapping, &has_type);
if (ptr) {
if (i915_gem_object_has_iomem(obj))
iosys_map_set_vaddr_iomem(&sb->map[0], (void __iomem *)ptr);
else
iosys_map_set_vaddr(&sb->map[0], ptr);
if (tiling) {
panic->tiling = tiling;
sb->set_pixel = i915_gem_object_panic_map_set_pixel;
}
return 0;
}
if (i915_gem_object_has_struct_page(obj)) {
panic->pages = i915_gem_object_panic_pages(obj);
if (!panic->pages)
return -ENOMEM;
panic->page = -1;
panic->tiling = tiling;
sb->set_pixel = i915_gem_object_panic_page_set_pixel;
return 0;
}
return -EOPNOTSUPP;
}
static void i915_gem_object_panic_finish(struct intel_panic *panic)
{
i915_panic_kunmap(panic);
panic->page = -1;
kfree(panic->pages);
panic->pages = NULL;
}
const struct intel_display_panic_interface i915_display_panic_interface = {
.alloc = i915_gem_object_alloc_panic,
.setup = i915_gem_object_panic_setup,
.finish = i915_gem_object_panic_finish,
};
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