Until Haswell/Baytrail, the hardware used to have a per engine fault
register (e.g. 0x4094 - render fault register, 0x4194 - media fault
register, etc). But since Broadwell, all these registers were combined
into a singe one, which specifies the engine id in bits 14:12.
Luckily, the additional register addresses haven't been reused, but we
should not been reading (and writing to) registers that do not exist.
References: IHD-OS-BDW-Vol 2c-11.15, page 75.
Signed-off-by: Michel Thierry <michel.thierry@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_gem_gtt.c | 29 ++++++++++++++++++++++++-----
drivers/gpu/drm/i915/i915_gpu_error.c | 8 +++++---
drivers/gpu/drm/i915/i915_reg.h | 2 ++
3 files changed, 31 insertions(+), 8 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index de67084d5fcf..83deb004368c 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -2000,22 +2000,41 @@ void i915_check_and_clear_faults(struct drm_i915_private *dev_priv)
if (INTEL_INFO(dev_priv)->gen < 6)
return;
- for_each_engine(engine, dev_priv, id) {
+ /* From GEN8 onwards we only have one 'All Engine Fault Register' */
+ if (INTEL_INFO(dev_priv)->gen >= 8) {
u32 fault_reg;
- fault_reg = I915_READ(RING_FAULT_REG(engine));
+ fault_reg = I915_READ(GEN8_RING_FAULT_REG);
if (fault_reg & RING_FAULT_VALID) {
DRM_DEBUG_DRIVER("Unexpected fault\n"
"\tAddr: 0x%08lx\n"
- "\tAddress space: %s\n"
+ "\tEngine ID: %d\n"
"\tSource ID: %d\n"
"\tType: %d\n",
fault_reg & PAGE_MASK,
- fault_reg & RING_FAULT_GTTSEL_MASK ? "GGTT" : "PPGTT",
+ GEN8_RING_FAULT_ENGINE_ID(fault_reg),
RING_FAULT_SRCID(fault_reg),
RING_FAULT_FAULT_TYPE(fault_reg));
- I915_WRITE(RING_FAULT_REG(engine),
+ I915_WRITE(GEN8_RING_FAULT_REG,
fault_reg & ~RING_FAULT_VALID);
}
+ } else {
+ for_each_engine(engine, dev_priv, id) {
+ u32 fault_reg;
+ fault_reg = I915_READ(RING_FAULT_REG(engine));
+ if (fault_reg & RING_FAULT_VALID) {
+ DRM_DEBUG_DRIVER("Unexpected fault\n"
+ "\tAddr: 0x%08lx\n"
+ "\tAddress space: %s\n"
+ "\tSource ID: %d\n"
+ "\tType: %d\n",
+ fault_reg & PAGE_MASK,
+ fault_reg & RING_FAULT_GTTSEL_MASK ? "GGTT" : "PPGTT",
+ RING_FAULT_SRCID(fault_reg),
+ RING_FAULT_FAULT_TYPE(fault_reg));
+ I915_WRITE(RING_FAULT_REG(engine),
+ fault_reg & ~RING_FAULT_VALID);
+ }
+ }
}
/* Engine specific init may not have been done till this point. */
diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
index ae70283470a6..b7f147b1b6dd 100644
--- a/drivers/gpu/drm/i915/i915_gpu_error.c
+++ b/drivers/gpu/drm/i915/i915_gpu_error.c
@@ -1167,11 +1167,13 @@ static void error_record_engine_registers(struct i915_gpu_state *error,
if (INTEL_GEN(dev_priv) >= 6) {
ee->rc_psmi = I915_READ(RING_PSMI_CTL(engine->mmio_base));
- ee->fault_reg = I915_READ(RING_FAULT_REG(engine));
- if (INTEL_GEN(dev_priv) >= 8)
+ if (INTEL_GEN(dev_priv) >= 8) {
gen8_record_semaphore_state(error, engine, ee);
- else
+ ee->fault_reg = I915_READ(GEN8_RING_FAULT_REG);
+ } else {
gen6_record_semaphore_state(engine, ee);
+ ee->fault_reg = I915_READ(RING_FAULT_REG(engine));
+ }
}
if (INTEL_GEN(dev_priv) >= 4) {
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index c8647cfa81ba..54a828aad777 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -2149,6 +2149,8 @@ enum skl_disp_power_wells {
#define ARB_MODE_SWIZZLE_BDW (1<<1)
#define RENDER_HWS_PGA_GEN7 _MMIO(0x04080)
#define RING_FAULT_REG(engine) _MMIO(0x4094 + 0x100*(engine)->hw_id)
+#define GEN8_RING_FAULT_REG _MMIO(0x4094)
+#define GEN8_RING_FAULT_ENGINE_ID(x) (((x) >> 12) & 0x7)
#define RING_FAULT_GTTSEL_MASK (1<<11)
#define RING_FAULT_SRCID(x) (((x) >> 3) & 0xff)
#define RING_FAULT_FAULT_TYPE(x) (((x) >> 1) & 0x3)
--
2.11.0
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