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dri3: implement get_modifiers - Return supported modifiers per format (e.g., AMD_TILED, LINEAR)

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determines which modifiers to advertise based on the GPU family:

GFX12+ (AMDGPU_FAMILY_GC_12_0_0 and newer): Returns GFX12 tiled modifiers
GFX10+ (AMDGPU_FAMILY_NV and newer): Returns GFX10 tiled modifiers
GFX9+ (AMDGPU_FAMILY_AI and newer): Returns GFX9 tiled modifiers
Older GPUs: Only LINEAR (DRM_FORMAT_MOD_INVALID)
This commit is contained in:
Joseph Crowell
2026-02-04 20:40:26 +10:00
parent 0e718f32e0
commit cca1e3a7b4
1 changed files with 79 additions and 1 deletions
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80
src/amdgpu_dri3.c
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@@ -36,6 +36,7 @@
#include <errno.h>
#include <libgen.h>
#include <drm/drm_fourcc.h>
#include <drm/amdgpu_drm.h>
static int open_card_node(ScreenPtr screen, int *out)
{
@@ -488,6 +489,83 @@ amdgpu_dri3_get_formats(ScreenPtr screen, unsigned int *num_formats,
return sizeof(formats_arr) / sizeof(formats_arr[0]);
}
/*
* Returns supported modifiers for a given format.
* This includes LINEAR (DRM_FORMAT_MOD_INVALID) and AMD-specific tiled modifiers.
*/
static int
amdgpu_dri3_get_modifiers(ScreenPtr screen, uint32_t format,
uint32_t *num_modifiers, uint64_t **modifiers)
{
ScrnInfoPtr scrn = xf86ScreenToScrn(screen);
AMDGPUInfoPtr info = AMDGPUPTR(scrn);
static uint64_t default_modifiers[] = {
/* LINEAR - no tiling */
DRM_FORMAT_MOD_INVALID,
};
static uint64_t amd_tiled_modifiers[] = {
/* LINEAR - no tiling */
DRM_FORMAT_MOD_INVALID,
/* AMD GFX9 64K_S tiled */
AMD_FMT_MOD | AMD_FMT_MOD_TILE_VER_GFX9 |
AMD_FMT_MOD_TILE_GFX9_64K_S,
/* AMD GFX9 64K_D tiled */
AMD_FMT_MOD | AMD_FMT_MOD_TILE_VER_GFX9 |
AMD_FMT_MOD_TILE_GFX9_64K_D,
};
static uint64_t amd_tiled_modifiers_gfx10[] = {
/* LINEAR - no tiling */
DRM_FORMAT_MOD_INVALID,
/* AMD GFX10 64K_S tiled */
AMD_FMT_MOD | AMD_FMT_MOD_TILE_VER_GFX10 |
AMD_FMT_MOD_TILE_GFX9_64K_S,
/* AMD GFX10 64K_D tiled */
AMD_FMT_MOD | AMD_FMT_MOD_TILE_VER_GFX10 |
AMD_FMT_MOD_TILE_GFX9_64K_D,
};
static uint64_t amd_tiled_modifiers_gfx12[] = {
/* LINEAR - no tiling */
DRM_FORMAT_MOD_INVALID,
/* AMD GFX12 64K_2D tiled */
AMD_FMT_MOD | AMD_FMT_MOD_TILE_VER_GFX12 |
AMD_FMT_MOD_TILE_GFX12_64K_2D,
};
uint64_t *mods;
uint32_t count;
int asic_family;
/* Get the ASIC family to determine which modifiers to advertise */
asic_family = info->family;
/* Determine which set of modifiers to return based on ASIC family */
if (asic_family >= AMDGPU_FAMILY_GC_12_0_0) {
mods = amd_tiled_modifiers_gfx12;
count = sizeof(amd_tiled_modifiers_gfx12) / sizeof(amd_tiled_modifiers_gfx12[0]);
} else if (asic_family >= AMDGPU_FAMILY_NV) {
/* Navi and newer (GFX10+) */
mods = amd_tiled_modifiers_gfx10;
count = sizeof(amd_tiled_modifiers_gfx10) / sizeof(amd_tiled_modifiers_gfx10[0]);
} else if (asic_family >= AMDGPU_FAMILY_AI) {
/* Vega and newer (GFX9+) */
mods = amd_tiled_modifiers;
count = sizeof(amd_tiled_modifiers) / sizeof(amd_tiled_modifiers[0]);
} else {
/* For older chips, only support LINEAR */
mods = default_modifiers;
count = sizeof(default_modifiers) / sizeof(default_modifiers[0]);
}
/* Allocate and copy modifiers */
*modifiers = malloc(count * sizeof(uint64_t));
if (!*modifiers)
return 0;
memcpy(*modifiers, mods, count * sizeof(uint64_t));
*num_modifiers = count;
return count;
}
static dri3_screen_info_rec amdgpu_dri3_screen_info = {
.version = 2,
.open = amdgpu_dri3_open,
@@ -497,7 +575,7 @@ static dri3_screen_info_rec amdgpu_dri3_screen_info = {
.pixmap_from_fds = amdgpu_dri3_pixmap_from_fds,
.fds_from_pixmap = amdgpu_dri3_fds_from_pixmap,
.get_formats = amdgpu_dri3_get_formats,
.get_modifiers = NULL,
.get_modifiers = amdgpu_dri3_get_modifiers,
.get_drawable_modifiers = NULL
};