[Intel-gfx] [PATCH] drm/i915/selftests: Canonicalise gen8 addresses

[Chris Wilson]

For igt_vm_isolation, we write into the whole 48b address space, and not
just our usual low 4G of global GTT. For these MI operations, play safe
and ensure we use the canonical address form.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Matthew Auld <matthew.auld at intel.com>
Cc: Mika Kuoppala <mika.kuoppala at intel.com>
---
 drivers/gpu/drm/i915/i915_gem_execbuffer.c    | 19 -----------------
 drivers/gpu/drm/i915/intel_gpu_commands.h     | 21 +++++++++++++++++++
 .../gpu/drm/i915/selftests/i915_gem_context.c |  2 ++
 3 files changed, 23 insertions(+), 19 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index 943a221acb21..c335c0a4099a 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -289,25 +289,6 @@ struct i915_execbuffer {
 
 #define exec_entry(EB, VMA) (&(EB)->exec[(VMA)->exec_flags - (EB)->flags])
 
-/*
- * Used to convert any address to canonical form.
- * Starting from gen8, some commands (e.g. STATE_BASE_ADDRESS,
- * MI_LOAD_REGISTER_MEM and others, see Broadwell PRM Vol2a) require the
- * addresses to be in a canonical form:
- * "GraphicsAddress[63:48] are ignored by the HW and assumed to be in correct
- * canonical form [63:48] == [47]."
- */
-#define GEN8_HIGH_ADDRESS_BIT 47
-static inline u64 gen8_canonical_addr(u64 address)
-{
-	return sign_extend64(address, GEN8_HIGH_ADDRESS_BIT);
-}
-
-static inline u64 gen8_noncanonical_addr(u64 address)
-{
-	return address & GENMASK_ULL(GEN8_HIGH_ADDRESS_BIT, 0);
-}
-
 static inline bool eb_use_cmdparser(const struct i915_execbuffer *eb)
 {
 	return intel_engine_needs_cmd_parser(eb->engine) && eb->batch_len;
diff --git a/drivers/gpu/drm/i915/intel_gpu_commands.h b/drivers/gpu/drm/i915/intel_gpu_commands.h
index a34ece53a771..b017bc928d00 100644
--- a/drivers/gpu/drm/i915/intel_gpu_commands.h
+++ b/drivers/gpu/drm/i915/intel_gpu_commands.h
@@ -7,6 +7,8 @@
 #ifndef _INTEL_GPU_COMMANDS_H_
 #define _INTEL_GPU_COMMANDS_H_
 
+#include <linux/bitops.h>
+
 /*
  * Instruction field definitions used by the command parser
  */
@@ -275,4 +277,23 @@
 #define COLOR_BLT     ((0x2<<29)|(0x40<<22))
 #define SRC_COPY_BLT  ((0x2<<29)|(0x43<<22))
 
+/*
+ * Used to convert any address to canonical form.
+ * Starting from gen8, some commands (e.g. STATE_BASE_ADDRESS,
+ * MI_LOAD_REGISTER_MEM and others, see Broadwell PRM Vol2a) require the
+ * addresses to be in a canonical form:
+ * "GraphicsAddress[63:48] are ignored by the HW and assumed to be in correct
+ * canonical form [63:48] == [47]."
+ */
+#define GEN8_HIGH_ADDRESS_BIT 47
+static inline u64 gen8_canonical_addr(u64 address)
+{
+	return sign_extend64(address, GEN8_HIGH_ADDRESS_BIT);
+}
+
+static inline u64 gen8_noncanonical_addr(u64 address)
+{
+	return address & GENMASK_ULL(GEN8_HIGH_ADDRESS_BIT, 0);
+}
+
 #endif /* _INTEL_GPU_COMMANDS_H_ */
diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_context.c b/drivers/gpu/drm/i915/selftests/i915_gem_context.c
index 0346ff224d5d..34a8c15273f4 100644
--- a/drivers/gpu/drm/i915/selftests/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/selftests/i915_gem_context.c
@@ -1194,6 +1194,7 @@ static int write_to_scratch(struct i915_gem_context *ctx,
 
 	*cmd++ = MI_STORE_DWORD_IMM_GEN4;
 	if (INTEL_GEN(i915) >= 8) {
+		offset = gen8_canonical_addr(offset);
 		*cmd++ = lower_32_bits(offset);
 		*cmd++ = upper_32_bits(offset);
 	} else {
@@ -1284,6 +1285,7 @@ static int read_from_scratch(struct i915_gem_context *ctx,
 	if (INTEL_GEN(i915) >= 8) {
 		*cmd++ = MI_LOAD_REGISTER_MEM_GEN8;
 		*cmd++ = RCS_GPR0;
+		offset = gen8_canonical_addr(offset);
 		*cmd++ = lower_32_bits(offset);
 		*cmd++ = upper_32_bits(offset);
 		*cmd++ = MI_STORE_REGISTER_MEM_GEN8;
-- 
2.20.1