From b03ec3d67ab840f674eb61a3467fd971c9552aa4 Mon Sep 17 00:00:00 2001 From: Michel Thierry Date: Mon, 13 Nov 2017 09:36:28 -0800 Subject: [PATCH] drm/i915: There is only one fault register from GEN8 onwards Until Haswell/Baytrail, the hardware used to have a per engine fault register (e.g. 0x4094 - render fault register, 0x4194 - media fault register and so on). But since Broadwell, all these registers were combined into a singe one and the engine id stored in bits 14:12. Not only we should not been reading (and writing to) registers that do not exist, in platforms with VCS2 (SKL), the address that would belong this engine (0x4494, VCS2_HW = 4) is already assigned to other register. v2: use less controversial function names (Chris). v3: make non-exported functions static, remove now obsolete check for engine presence before posting_read (Chris). References: IHD-OS-BDW-Vol 2c-11.15, page 75. References: IHD-OS-SKL-Vol 2c-05.16, page 350. Signed-off-by: Michel Thierry Cc: Chris Wilson Link: https://patchwork.freedesktop.org/patch/msgid/20171113173628.11689-1-michel.thierry@intel.com Reviewed-by: Chris Wilson Signed-off-by: Chris Wilson --- drivers/gpu/drm/i915/i915_gem_gtt.c | 57 ++++++++++++++++++++++++++--------- drivers/gpu/drm/i915/i915_gpu_error.c | 8 +++-- drivers/gpu/drm/i915/i915_reg.h | 2 ++ 3 files changed, 49 insertions(+), 18 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c index 1e40eeb31f9d..3c3a699436c9 100644 --- a/drivers/gpu/drm/i915/i915_gem_gtt.c +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c @@ -2256,35 +2256,62 @@ static bool needs_idle_maps(struct drm_i915_private *dev_priv) return IS_GEN5(dev_priv) && IS_MOBILE(dev_priv) && intel_vtd_active(); } -void i915_check_and_clear_faults(struct drm_i915_private *dev_priv) +static void gen6_check_and_clear_faults(struct drm_i915_private *dev_priv) { struct intel_engine_cs *engine; enum intel_engine_id id; - - if (INTEL_INFO(dev_priv)->gen < 6) - return; + u32 fault; for_each_engine(engine, dev_priv, id) { - u32 fault_reg; - fault_reg = I915_READ(RING_FAULT_REG(engine)); - if (fault_reg & RING_FAULT_VALID) { + fault = I915_READ(RING_FAULT_REG(engine)); + if (fault & 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)); + fault & PAGE_MASK, + fault & RING_FAULT_GTTSEL_MASK ? "GGTT" : "PPGTT", + RING_FAULT_SRCID(fault), + RING_FAULT_FAULT_TYPE(fault)); I915_WRITE(RING_FAULT_REG(engine), - fault_reg & ~RING_FAULT_VALID); + fault & ~RING_FAULT_VALID); } } - /* Engine specific init may not have been done till this point. */ - if (dev_priv->engine[RCS]) - POSTING_READ(RING_FAULT_REG(dev_priv->engine[RCS])); + POSTING_READ(RING_FAULT_REG(dev_priv->engine[RCS])); +} + +static void gen8_check_and_clear_faults(struct drm_i915_private *dev_priv) +{ + u32 fault = I915_READ(GEN8_RING_FAULT_REG); + + if (fault & RING_FAULT_VALID) { + DRM_DEBUG_DRIVER("Unexpected fault\n" + "\tAddr: 0x%08lx\n" + "\tEngine ID: %d\n" + "\tSource ID: %d\n" + "\tType: %d\n", + fault & PAGE_MASK, + GEN8_RING_FAULT_ENGINE_ID(fault), + RING_FAULT_SRCID(fault), + RING_FAULT_FAULT_TYPE(fault)); + I915_WRITE(GEN8_RING_FAULT_REG, + fault & ~RING_FAULT_VALID); + } + + POSTING_READ(GEN8_RING_FAULT_REG); +} + +void i915_check_and_clear_faults(struct drm_i915_private *dev_priv) +{ + /* From GEN8 onwards we only have one 'All Engine Fault Register' */ + if (INTEL_GEN(dev_priv) >= 8) + gen8_check_and_clear_faults(dev_priv); + else if (INTEL_GEN(dev_priv) >= 6) + gen6_check_and_clear_faults(dev_priv); + else + return; } void i915_gem_suspend_gtt_mappings(struct drm_i915_private *dev_priv) diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c index 5c2d83a838d8..7481c8e1b5a8 100644 --- a/drivers/gpu/drm/i915/i915_gpu_error.c +++ b/drivers/gpu/drm/i915/i915_gpu_error.c @@ -1217,11 +1217,13 @@ 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 05e33a41fcc7..e52e74db4c7c 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -2360,6 +2360,8 @@ enum i915_power_well_id { #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