[Intel-gfx] [PATCH v4] drm/i915: Show IPEIR and IPEHR in the engine dump

[Chris Wilson]

A useful bit of information for inspecting GPU stalls from
intel_engine_dump() are the error registers, IPEIR and IPEHR.

v2: Fixup gen changes in register offsets (Tvrtko)
v3: Old FADDR location as well
v4: Use I915_READ64_2x32

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala at linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
---
 drivers/gpu/drm/i915/intel_engine_cs.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c
index 510e0bc3a377..b4807497e92d 100644
--- a/drivers/gpu/drm/i915/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/intel_engine_cs.c
@@ -1757,6 +1757,24 @@ void intel_engine_dump(struct intel_engine_cs *engine,
 	addr = intel_engine_get_last_batch_head(engine);
 	drm_printf(m, "\tBBADDR: 0x%08x_%08x\n",
 		   upper_32_bits(addr), lower_32_bits(addr));
+	if (INTEL_GEN(dev_priv) >= 8)
+		addr = I915_READ64_2x32(RING_DMA_FADD(engine->mmio_base),
+					RING_DMA_FADD_UDW(engine->mmio_base));
+	else if (INTEL_GEN(dev_priv) >= 4)
+		addr = I915_READ(RING_DMA_FADD(engine->mmio_base));
+	else
+		addr = I915_READ(DMA_FADD_I8XX);
+	drm_printf(m, "\tDMA_FADDR: 0x%08x_%08x\n",
+		   upper_32_bits(addr), lower_32_bits(addr));
+	if (INTEL_GEN(dev_priv) >= 4) {
+		drm_printf(m, "\tIPEIR: 0x%08x\n",
+			   I915_READ(RING_IPEIR(engine->mmio_base)));
+		drm_printf(m, "\tIPEHR: 0x%08x\n",
+			   I915_READ(RING_IPEHR(engine->mmio_base)));
+	} else {
+		drm_printf(m, "\tIPEIR: 0x%08x\n", I915_READ(IPEIR));
+		drm_printf(m, "\tIPEHR: 0x%08x\n", I915_READ(IPEHR));
+	}
 
 	if (HAS_EXECLISTS(dev_priv)) {
 		const u32 *hws = &engine->status_page.page_addr[I915_HWS_CSB_BUF0_INDEX];
-- 
2.15.1