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: 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>

diff --git a/drivers/gpu/drm/xe/xe_device_types.h b/drivers/gpu/drm/xe/xe_device_types.h
index a68cc47ce014df4dc53de1d3789ded2d66fc5102..a42cb26e7d6def294ecb8f78e793a09e32f8e562 100644 (file)
--- a/drivers/gpu/drm/xe/xe_device_types.h
+++ b/drivers/gpu/drm/xe/xe_device_types.h
@@ -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

diff --git a/drivers/gpu/drm/xe/xe_pci.c b/drivers/gpu/drm/xe/xe_pci.c
index 58347fa9184157a921909fe0c677fec7af4f025f..780287692e61f137647ab2a08da72106d8c4330f 100644 (file)
--- a/drivers/gpu/drm/xe/xe_pci.c
+++ b/drivers/gpu/drm/xe/xe_pci.c
@@ -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 &&