[Intel-gfx] [PATCH 1/3] drm/i915/xehpsdv/dg1/tgl: Fix issue with LRI relative addressing

[Ramalingam C <ramalingam.c@intel.com>]

From: Akeem G Abodunrin <akeem.g.abodunrin@intel.com>

When bit 19 of MI_LOAD_REGISTER_IMM instruction opcode is set on tgl+
devices, HW does not care about certain register address offsets, but
instead check the following for valid address ranges on specific engines:
	RCS && CCS: BITS(0 - 10)
	BCS: BITS(0 - 11)
	VECS && VCS: BITS(0 - 13)
Also, tgl+ now support relative addressing for BCS engine - So, this
patch fixes issue with live_gt_lrc selftest that is failing where there is
mismatch between LRC register layout generated during init and HW
default register offsets.

Signed-off-by: Akeem G Abodunrin <akeem.g.abodunrin@intel.com>
cc: Prathap Kumar Valsan <prathap.kumar.valsan@intel.com>
Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
---
 drivers/gpu/drm/i915/gt/selftest_lrc.c | 36 +++++++++++++++++++++++++-
 1 file changed, 35 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gt/selftest_lrc.c b/drivers/gpu/drm/i915/gt/selftest_lrc.c
index 6ba52ef1acb8..8dc7b88cdca0 100644
--- a/drivers/gpu/drm/i915/gt/selftest_lrc.c
+++ b/drivers/gpu/drm/i915/gt/selftest_lrc.c
@@ -128,6 +128,27 @@ static int context_flush(struct intel_context *ce, long timeout)
 	return err;
 }
 
+static int get_lri_mask(struct intel_engine_cs *engine, u32 lri)
+{
+	if ((lri & MI_LRI_LRM_CS_MMIO) == 0)
+		return ~0u;
+
+	if (GRAPHICS_VER(engine->i915) < 12)
+		return 0xfff;
+
+	switch (engine->class) {
+	default:
+	case RENDER_CLASS:
+	case COMPUTE_CLASS:
+		return 0x07ff;
+	case COPY_ENGINE_CLASS:
+		return 0x0fff;
+	case VIDEO_DECODE_CLASS:
+	case VIDEO_ENHANCEMENT_CLASS:
+		return 0x3fff;
+	}
+}
+
 static int live_lrc_layout(void *arg)
 {
 	struct intel_gt *gt = arg;
@@ -167,6 +188,7 @@ static int live_lrc_layout(void *arg)
 		dw = 0;
 		do {
 			u32 lri = READ_ONCE(hw[dw]);
+			u32 lri_mask;
 
 			if (lri == 0) {
 				dw++;
@@ -194,6 +216,18 @@ static int live_lrc_layout(void *arg)
 				break;
 			}
 
+			/*
+			 * When bit 19 of MI_LOAD_REGISTER_IMM instruction
+			 * opcode is set on Gen12+ devices, HW does not
+			 * care about certain register address offsets, and
+			 * instead check the following for valid address
+			 * ranges on specific engines:
+			 * RCS && CCS: BITS(0 - 10)
+			 * BCS: BITS(0 - 11)
+			 * VECS && VCS: BITS(0 - 13)
+			 */
+			lri_mask = get_lri_mask(engine, lri);
+
 			lri &= 0x7f;
 			lri++;
 			dw++;
@@ -201,7 +235,7 @@ static int live_lrc_layout(void *arg)
 			while (lri) {
 				u32 offset = READ_ONCE(hw[dw]);
 
-				if (offset != lrc[dw]) {
+				if ((offset ^ lrc[dw]) & lri_mask) {
 					pr_err("%s: Different registers found at dword %d, expected %x, found %x\n",
 					       engine->name, dw, offset, lrc[dw]);
 					err = -EINVAL;
-- 
2.20.1