[Intel-gfx] [PATCH] drm/i915: Add extra registers to GPU error dump

[Matt Roper]

From: Stuart Summers <stuart.summers at intel.com>

Our internal teams have identified a few additional engine registers
that are worth inspecting in error state dumps during development &
debug.  Let's capture and print them as part of our error dump.

For simplicity we'll just dump these registers on gen11 and beyond.
Most of these registers have existed since earlier platforms (e.g., gen6
or gen7) but were initially introduced only for a subset of the
platforms' engines; gen11 seems to be where they became available on all
engines.

Signed-off-by: Stuart Summers <stuart.summers at intel.com>
Signed-off-by: Matt Roper <matthew.d.roper at intel.com>
---
 drivers/gpu/drm/i915/gt/intel_engine_regs.h |  5 +++++
 drivers/gpu/drm/i915/i915_gpu_error.c       | 19 +++++++++++++++++++
 drivers/gpu/drm/i915/i915_gpu_error.h       |  7 +++++++
 3 files changed, 31 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/intel_engine_regs.h b/drivers/gpu/drm/i915/gt/intel_engine_regs.h
index 44de10cf7837..889f0df3940b 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_regs.h
+++ b/drivers/gpu/drm/i915/gt/intel_engine_regs.h
@@ -8,6 +8,7 @@
 
 #include "i915_reg_defs.h"
 
+#define RING_EXCC(base)				_MMIO((base) + 0x28)
 #define RING_TAIL(base)				_MMIO((base) + 0x30)
 #define   TAIL_ADDR				0x001FFFF8
 #define RING_HEAD(base)				_MMIO((base) + 0x34)
@@ -133,6 +134,8 @@
 		(REG_FIELD_PREP(BLIT_CCTL_DST_MOCS_MASK, (dst) << 1) | \
 		 REG_FIELD_PREP(BLIT_CCTL_SRC_MOCS_MASK, (src) << 1))
 
+#define RING_CSCMDOP(base)			_MMIO((base) + 0x20c)
+
 /*
  * CMD_CCTL read/write fields take a MOCS value and _not_ a table index.
  * The lsb of each can be considered a separate enabling bit for encryption.
@@ -149,6 +152,7 @@
 		 REG_FIELD_PREP(CMD_CCTL_READ_OVERRIDE_MASK, (read) << 1))
 
 #define RING_PREDICATE_RESULT(base)		_MMIO((base) + 0x3b8) /* gen12+ */
+
 #define MI_PREDICATE_RESULT_2(base)		_MMIO((base) + 0x3bc)
 #define   LOWER_SLICE_ENABLED			(1 << 0)
 #define   LOWER_SLICE_DISABLED			(0 << 0)
@@ -172,6 +176,7 @@
 #define	  CTX_CTRL_ENGINE_CTX_SAVE_INHIBIT	REG_BIT(2)
 #define	  CTX_CTRL_INHIBIT_SYN_CTX_SWITCH	REG_BIT(3)
 #define	  GEN12_CTX_CTRL_OAR_CONTEXT_ENABLE	REG_BIT(8)
+#define RING_CTX_SR_CTL(base)			_MMIO((base) + 0x244)
 #define RING_SEMA_WAIT_POLL(base)		_MMIO((base) + 0x24c)
 #define GEN8_RING_PDP_UDW(base, n)		_MMIO((base) + 0x270 + (n) * 8 + 4)
 #define GEN8_RING_PDP_LDW(base, n)		_MMIO((base) + 0x270 + (n) * 8)
diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
index 0512c66fa4f3..bff8a111424a 100644
--- a/drivers/gpu/drm/i915/i915_gpu_error.c
+++ b/drivers/gpu/drm/i915/i915_gpu_error.c
@@ -581,6 +581,15 @@ static void error_print_engine(struct drm_i915_error_state_buf *m,
 		err_printf(m, "  RC PSMI: 0x%08x\n", ee->rc_psmi);
 		err_printf(m, "  FAULT_REG: 0x%08x\n", ee->fault_reg);
 	}
+	if (GRAPHICS_VER(m->i915) >= 11) {
+		err_printf(m, "  NOPID: 0x%08x\n", ee->nopid);
+		err_printf(m, "  EXCC: 0x%08x\n", ee->excc);
+		err_printf(m, "  CMD_CCTL: 0x%08x\n", ee->cmd_cctl);
+		err_printf(m, "  CSCMDOP: 0x%08x\n", ee->cscmdop);
+		err_printf(m, "  CTX_SR_CTL: 0x%08x\n", ee->ctx_sr_ctl);
+		err_printf(m, "  DMA_FADDR_HI: 0x%08x\n", ee->dma_faddr_hi);
+		err_printf(m, "  DMA_FADDR_LO: 0x%08x\n", ee->dma_faddr_lo);
+	}
 	if (HAS_PPGTT(m->i915)) {
 		err_printf(m, "  GFX_MODE: 0x%08x\n", ee->vm_info.gfx_mode);
 
@@ -1224,6 +1233,16 @@ static void engine_record_registers(struct intel_engine_coredump *ee)
 		ee->ipehr = ENGINE_READ(engine, IPEHR);
 	}
 
+	if (GRAPHICS_VER(i915) >= 11) {
+		ee->cmd_cctl = ENGINE_READ(engine, RING_CMD_CCTL);
+		ee->cscmdop = ENGINE_READ(engine, RING_CSCMDOP);
+		ee->ctx_sr_ctl = ENGINE_READ(engine, RING_CTX_SR_CTL);
+		ee->dma_faddr_hi = ENGINE_READ(engine, RING_DMA_FADD_UDW);
+		ee->dma_faddr_lo = ENGINE_READ(engine, RING_DMA_FADD);
+		ee->nopid = ENGINE_READ(engine, RING_NOPID);
+		ee->excc = ENGINE_READ(engine, RING_EXCC);
+	}
+
 	intel_engine_get_instdone(engine, &ee->instdone);
 
 	ee->instpm = ENGINE_READ(engine, RING_INSTPM);
diff --git a/drivers/gpu/drm/i915/i915_gpu_error.h b/drivers/gpu/drm/i915/i915_gpu_error.h
index a611abacd9c2..55a143b92d10 100644
--- a/drivers/gpu/drm/i915/i915_gpu_error.h
+++ b/drivers/gpu/drm/i915/i915_gpu_error.h
@@ -84,6 +84,13 @@ struct intel_engine_coredump {
 	u32 fault_reg;
 	u64 faddr;
 	u32 rc_psmi; /* sleep state */
+	u32 nopid;
+	u32 excc;
+	u32 cmd_cctl;
+	u32 cscmdop;
+	u32 ctx_sr_ctl;
+	u32 dma_faddr_hi;
+	u32 dma_faddr_lo;
 	struct intel_instdone instdone;
 
 	/* GuC matched capture-lists info */
-- 
2.35.3