Commit 953d35c0 authored by Oak Zeng's avatar Oak Zeng Committed by Himal Prasad Ghimiray
Browse files

drm/xe: Introduced needs_scratch bit in device descriptor 



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: default avatarOak Zeng <oak.zeng@intel.com>
Reviewed-by: default avatarThomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: default avatarHimal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Link: https://lore.kernel.org/r/20250403165328.2438690-2-oak.zeng@intel.com


Signed-off-by: default avatarHimal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
parent 1e32ffbc

drivers/gpu/drm/xe/xe_device_types.h

+2 −0
Original line number Diff line number Diff line
@@ -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

drivers/gpu/drm/xe/xe_pci.c

+5 −0
Original line number Diff line number Diff line
@@ -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 &&