[Intel-xe] [PATCH] drm/xe: Implement HW workaround 14016763929

[Oak Zeng <oak.zeng@intel.com>]

To workaround a HW bug on DG2, driver is required to map the whole
ppgtt virtual address space before GPU workload submission. Thus
set the XE_VM_FLAG_SCRATCH_PAGE flag during vm create so the whole
address space is mapped to point to scratch page.

v1:
  - Move the workaround implementation from xe_vm_create to
    xe_vm_create_ioctl - Brian
  - Reorder error checking in xe_vm_create_ioctl - Jose
  - Implement WA only for DG2-G10 and DG2-G12

Signed-off-by: Oak Zeng <oak.zeng@intel.com>
---
 drivers/gpu/drm/xe/Makefile        |  2 +-
 drivers/gpu/drm/xe/xe_vm.c         | 13 +++++++++----
 drivers/gpu/drm/xe/xe_wa_oob.rules |  2 ++
 3 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/xe/Makefile b/drivers/gpu/drm/xe/Makefile
index 1b59702cd9f9..c91bb7ddcf1d 100644
--- a/drivers/gpu/drm/xe/Makefile
+++ b/drivers/gpu/drm/xe/Makefile
@@ -37,7 +37,7 @@ quiet_cmd_wa_oob = GEN     $(notdir $(generated_oob))
 $(generated_oob) &: $(obj)/xe_gen_wa_oob $(srctree)/$(src)/xe_wa_oob.rules
 	$(call cmd,wa_oob)
 
-$(obj)/xe_guc.o $(obj)/xe_wa.o $(obj)/xe_ring_ops.o: $(generated_oob)
+$(obj)/xe_guc.o $(obj)/xe_wa.o $(obj)/xe_ring_ops.o $(obj)/xe_vm.o: $(generated_oob)
 
 # Please keep these build lists sorted!
 
diff --git a/drivers/gpu/drm/xe/xe_vm.c b/drivers/gpu/drm/xe/xe_vm.c
index cb28dbc2bdbb..394bd23dc18e 100644
--- a/drivers/gpu/drm/xe/xe_vm.c
+++ b/drivers/gpu/drm/xe/xe_vm.c
@@ -29,6 +29,8 @@
 #include "xe_res_cursor.h"
 #include "xe_sync.h"
 #include "xe_trace.h"
+#include "generated/xe_wa_oob.h"
+#include "xe_wa.h"
 
 #define TEST_VM_ASYNC_OPS_ERROR
 
@@ -1982,6 +1984,13 @@ int xe_vm_create_ioctl(struct drm_device *dev, void *data,
 	int err;
 	u32 flags = 0;
 
+	if (XE_WA(xe_root_mmio_gt(xe), 14016763929))
+		args->flags |= DRM_XE_VM_CREATE_SCRATCH_PAGE;
+
+	if (XE_IOCTL_DBG(xe, args->flags & DRM_XE_VM_CREATE_FAULT_MODE &&
+			 !xe->info.supports_usm))
+		return -EINVAL;
+
 	if (XE_IOCTL_DBG(xe, args->reserved[0] || args->reserved[1]))
 		return -EINVAL;
 
@@ -2004,10 +2013,6 @@ int xe_vm_create_ioctl(struct drm_device *dev, void *data,
 			 xe_device_in_fault_mode(xe)))
 		return -EINVAL;
 
-	if (XE_IOCTL_DBG(xe, args->flags & DRM_XE_VM_CREATE_FAULT_MODE &&
-			 !xe->info.supports_usm))
-		return -EINVAL;
-
 	if (args->flags & DRM_XE_VM_CREATE_SCRATCH_PAGE)
 		flags |= XE_VM_FLAG_SCRATCH_PAGE;
 	if (args->flags & DRM_XE_VM_CREATE_COMPUTE_MODE)
diff --git a/drivers/gpu/drm/xe/xe_wa_oob.rules b/drivers/gpu/drm/xe/xe_wa_oob.rules
index 15c23813398a..ea90dcc933b5 100644
--- a/drivers/gpu/drm/xe/xe_wa_oob.rules
+++ b/drivers/gpu/drm/xe/xe_wa_oob.rules
@@ -15,3 +15,5 @@
 18020744125	PLATFORM(PVC)
 1509372804	PLATFORM(PVC), GRAPHICS_STEP(A0, C0)
 1409600907	GRAPHICS_VERSION_RANGE(1200, 1250)
+14016763929	SUBPLATFORM(DG2, G10)
+		SUBPLATFORM(DG2, G12)
-- 
2.26.3