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drm/xe: Introduced needs_scratch bit in device descriptor

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On some platform, scratch page is needed for out of bound prefetch
to work. Introduce a bit in device descriptor to specify whether
this device needs scratch page to work.

v2: introduce a needs_scratch bit in device info (Thomas, Jonathan)
v3: drop NEEDS_SCRATCH macro (Matt)

Signed-off-by: Oak Zeng <oak.zeng@intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Link: https://lore.kernel.org/r/20250403165328.2438690-2-oak.zeng@intel.com
Signed-off-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
This commit is contained in:
Oak Zeng
2025-04-03 12:53:26 -04:00
committed by Himal Prasad Ghimiray
parent 1e32ffbc9d
commit 953d35c0b8
2 changed files with 7 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/gpu/drm/xe/xe_device_types.h
View File

@@ -336,6 +336,8 @@ struct xe_device {
u8 has_usm:1;
/** @info.is_dgfx: is discrete device */
u8 is_dgfx:1;
/** @info.needs_scratch: needs scratch page for oob prefetch to work */
u8 needs_scratch:1;
/**
* @info.probe_display: Probe display hardware. If set to
* false, the driver will behave as if there is no display

5
drivers/gpu/drm/xe/xe_pci.c
View File

@@ -68,6 +68,7 @@ struct xe_device_desc {
u8 has_llc:1;
u8 has_pxp:1;
u8 has_sriov:1;
u8 needs_scratch:1;
u8 skip_guc_pc:1;
u8 skip_mtcfg:1;
u8 skip_pcode:1;
@@ -331,6 +332,7 @@ static const struct xe_device_desc lnl_desc = {
.dma_mask_size = 46,
.has_display = true,
.has_pxp = true,
.needs_scratch = true,
};
static const struct xe_device_desc bmg_desc = {
@@ -340,6 +342,7 @@ static const struct xe_device_desc bmg_desc = {
.has_display = true,
.has_fan_control = true,
.has_heci_cscfi = 1,
.needs_scratch = true,
};
static const struct xe_device_desc ptl_desc = {
@@ -348,6 +351,7 @@ static const struct xe_device_desc ptl_desc = {
.has_display = true,
.has_sriov = true,
.require_force_probe = true,
.needs_scratch = true,
};
#undef PLATFORM
@@ -587,6 +591,7 @@ static int xe_info_init_early(struct xe_device *xe,
xe->info.skip_guc_pc = desc->skip_guc_pc;
xe->info.skip_mtcfg = desc->skip_mtcfg;
xe->info.skip_pcode = desc->skip_pcode;
xe->info.needs_scratch = desc->needs_scratch;
xe->info.probe_display = IS_ENABLED(CONFIG_DRM_XE_DISPLAY) &&
xe_modparam.probe_display &&