From f08e2035cc089caf52ce57e855d96ba6ba90c71a Mon Sep 17 00:00:00 2001 From: Jackie Li Date: Tue, 13 Mar 2018 17:32:53 -0700 Subject: [PATCH] drm/i915/guc: Check the locking status of GuC WOPCM registers GuC WOPCM registers are write-once registers. Current driver code accesses these registers without checking the accessibility to these registers which will lead to unpredictable driver behaviors if these registers were touch by other components (such as faulty BIOS code). This patch moves the GuC WOPCM registers updating code into intel_wopcm.c and adds check before and after the update to GuC WOPCM registers so that we can make sure the driver is in a known state after writing to these write-once registers. v6: - Made sure module reloading won't bug the kernel while doing locking status checking v7: - Fixed patch format issues v8: - Fixed coding style issue on register lock bit macro definition (Sagar) v9: - Avoided to use redundant !! to cast uint to bool (Chris) - Return error code instead of GEM_BUG_ON for locked with invalid register values case (Sagar) - Updated guc_wopcm_hw_init to use guc_wopcm as first parameter (Michal) - Added code to set and validate the HuC_LOADING_AGENT_GUC bit in GuC WOPCM offset register based on the presence of HuC firmware (Michal) - Use bit fields instead of macros for GuC WOPCM flags (Michal) v10: - Refined variable names, removed redundant comments (Joonas) - Introduced lockable_reg to handle the write once register write and propagate the write error to caller (Joonas) - Used lockable_reg abstraction to avoid locking bit check on generic i915_reg_t (Michal) - Added log message for error paths (Michal) - Removed hw_updated flag and only relies on real hardware status v11: - Replaced lockable_reg with simplified function (Michal) - Used new macros for locking bits of WOPCM size/offset registers instead of using BIT(0) directly (Michal) - use intel_wopcm_init_hw() called from intel_gem_init_hw() to do GuC WOPCM register setup instead of calling from intel_uc_init_hw() (Michal) v12: - Updated function kernel-doc to align with code changes (Michal) - Updated code to use wopcm pointer directly (Michal) v13: - Updated the ordering of s-o-b/cc/r-b tags (Sagar) BSpec: 10875, 10833 Signed-off-by: Jackie Li Cc: Michal Wajdeczko Cc: Chris Wilson Cc: Joonas Lahtinen Reviewed-by: Michal Wajdeczko (v11) Reviewed-by: Joonas Lahtinen (v12) Reviewed-by: Joonas Lahtinen Signed-off-by: Joonas Lahtinen Link: https://patchwork.freedesktop.org/patch/msgid/1520987574-19351-5-git-send-email-yaodong.li@intel.com --- drivers/gpu/drm/i915/i915_gem.c | 6 +++ drivers/gpu/drm/i915/intel_guc_reg.h | 3 ++ drivers/gpu/drm/i915/intel_uc.c | 5 --- drivers/gpu/drm/i915/intel_wopcm.c | 64 ++++++++++++++++++++++++++++ drivers/gpu/drm/i915/intel_wopcm.h | 1 + 5 files changed, 74 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index 51faa6506739..13d4b0e74641 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -5137,6 +5137,12 @@ int i915_gem_init_hw(struct drm_i915_private *dev_priv) goto out; } + ret = intel_wopcm_init_hw(&dev_priv->wopcm); + if (ret) { + DRM_ERROR("Enabling WOPCM failed (%d)\n", ret); + goto out; + } + /* We can't enable contexts until all firmware is loaded */ ret = intel_uc_init_hw(dev_priv); if (ret) { diff --git a/drivers/gpu/drm/i915/intel_guc_reg.h b/drivers/gpu/drm/i915/intel_guc_reg.h index 01963d085ed6..d86084742a4a 100644 --- a/drivers/gpu/drm/i915/intel_guc_reg.h +++ b/drivers/gpu/drm/i915/intel_guc_reg.h @@ -66,15 +66,18 @@ #define UOS_MOVE (1<<4) #define START_DMA (1<<0) #define DMA_GUC_WOPCM_OFFSET _MMIO(0xc340) +#define GUC_WOPCM_OFFSET_VALID (1<<0) #define HUC_LOADING_AGENT_VCR (0<<1) #define HUC_LOADING_AGENT_GUC (1<<1) #define GUC_WOPCM_OFFSET_SHIFT 14 +#define GUC_WOPCM_OFFSET_MASK (0x3ffff << GUC_WOPCM_OFFSET_SHIFT) #define GUC_MAX_IDLE_COUNT _MMIO(0xC3E4) #define HUC_STATUS2 _MMIO(0xD3B0) #define HUC_FW_VERIFIED (1<<7) #define GUC_WOPCM_SIZE _MMIO(0xc050) +#define GUC_WOPCM_SIZE_LOCKED (1<<0) #define GUC_WOPCM_SIZE_SHIFT 12 #define GUC_WOPCM_SIZE_MASK (0xfffff << GUC_WOPCM_SIZE_SHIFT) diff --git a/drivers/gpu/drm/i915/intel_uc.c b/drivers/gpu/drm/i915/intel_uc.c index ed5a6fcc8557..6316548a1c78 100644 --- a/drivers/gpu/drm/i915/intel_uc.c +++ b/drivers/gpu/drm/i915/intel_uc.c @@ -367,11 +367,6 @@ int intel_uc_init_hw(struct drm_i915_private *dev_priv) gen9_reset_guc_interrupts(dev_priv); - /* init WOPCM */ - I915_WRITE(GUC_WOPCM_SIZE, dev_priv->wopcm.guc.size); - I915_WRITE(DMA_GUC_WOPCM_OFFSET, - dev_priv->wopcm.guc.base | HUC_LOADING_AGENT_GUC); - /* WaEnableuKernelHeaderValidFix:skl */ /* WaEnableGuCBootHashCheckNotSet:skl,bxt,kbl */ if (IS_GEN9(dev_priv)) diff --git a/drivers/gpu/drm/i915/intel_wopcm.c b/drivers/gpu/drm/i915/intel_wopcm.c index 1fd1125f464b..4117886bfb05 100644 --- a/drivers/gpu/drm/i915/intel_wopcm.c +++ b/drivers/gpu/drm/i915/intel_wopcm.c @@ -207,3 +207,67 @@ int intel_wopcm_init(struct intel_wopcm *wopcm) return 0; } + +static inline int write_and_verify(struct drm_i915_private *dev_priv, + i915_reg_t reg, u32 val, u32 mask, + u32 locked_bit) +{ + u32 reg_val; + + GEM_BUG_ON(val & ~mask); + + I915_WRITE(reg, val); + + reg_val = I915_READ(reg); + + return (reg_val & mask) != (val | locked_bit) ? -EIO : 0; +} + +/** + * intel_wopcm_init_hw() - Setup GuC WOPCM registers. + * @wopcm: pointer to intel_wopcm. + * + * Setup the GuC WOPCM size and offset registers with the calculated values. It + * will verify the register values to make sure the registers are locked with + * correct values. + * + * Return: 0 on success. -EIO if registers were locked with incorrect values. + */ +int intel_wopcm_init_hw(struct intel_wopcm *wopcm) +{ + struct drm_i915_private *dev_priv = wopcm_to_i915(wopcm); + u32 huc_agent; + u32 mask; + int err; + + if (!USES_GUC(dev_priv)) + return 0; + + GEM_BUG_ON(!HAS_GUC(dev_priv)); + GEM_BUG_ON(!wopcm->guc.size); + GEM_BUG_ON(!wopcm->guc.base); + + err = write_and_verify(dev_priv, GUC_WOPCM_SIZE, wopcm->guc.size, + GUC_WOPCM_SIZE_MASK | GUC_WOPCM_SIZE_LOCKED, + GUC_WOPCM_SIZE_LOCKED); + if (err) + goto err_out; + + huc_agent = USES_HUC(dev_priv) ? HUC_LOADING_AGENT_GUC : 0; + mask = GUC_WOPCM_OFFSET_MASK | GUC_WOPCM_OFFSET_VALID | huc_agent; + err = write_and_verify(dev_priv, DMA_GUC_WOPCM_OFFSET, + wopcm->guc.base | huc_agent, mask, + GUC_WOPCM_OFFSET_VALID); + if (err) + goto err_out; + + return 0; + +err_out: + DRM_ERROR("Failed to init WOPCM registers:\n"); + DRM_ERROR("DMA_GUC_WOPCM_OFFSET=%#x\n", + I915_READ(DMA_GUC_WOPCM_OFFSET)); + DRM_ERROR("GUC_WOPCM_SIZE=%#x\n", I915_READ(GUC_WOPCM_SIZE)); + + return err; +} diff --git a/drivers/gpu/drm/i915/intel_wopcm.h b/drivers/gpu/drm/i915/intel_wopcm.h index 93c402ca7489..6298910a384c 100644 --- a/drivers/gpu/drm/i915/intel_wopcm.h +++ b/drivers/gpu/drm/i915/intel_wopcm.h @@ -26,5 +26,6 @@ struct intel_wopcm { void intel_wopcm_init_early(struct intel_wopcm *wopcm); int intel_wopcm_init(struct intel_wopcm *wopcm); +int intel_wopcm_init_hw(struct intel_wopcm *wopcm); #endif -- GitLab