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drm/i915/guc: always reset GuC before loading firmware

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After a suspend-resume cycle, the resumed kernel has no idea what the
booted kernel may have done to the GuC before replacing itself with the
resumed image. In particular, it may have already loaded the GuC with
firmware, which will then cause this kernel's attempt to (re)load the
firmware to fail (GuC program memory is write-once!). The symptoms
(GuC firmware reload fails after hibernation) are further described
in the Bugzilla reference below.

So let's *always* reset the GuC just before (re)loading the firmware;
the hardware should then be in a well-known state, and we may even
avoid some of the issues arising from unpredictable timing.

Also added some more fields & values to the definition of the GUC_STATUS
register, which is the key diagnostic indicator if the GuC load fails.

Signed-off-by: Dave Gordon <david.s.gordon@intel.com>
Reviewed-by: Arun Siluvery <arun.siluvery@linux.intel.com>
Cc: Alex Dai <yu.dai@intel.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=94390
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
This commit is contained in:
Dave Gordon 2016-04-04 18:50:57 +01:00 committed by Tvrtko Ursulin
parent 6b332fa20f
commit d761701c55
2 changed files with 29 additions and 23 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

12
drivers/gpu/drm/i915/i915_guc_reg.h
View file

@ -27,10 +27,12 @@
/* Definitions of GuC H/W registers, bits, etc */
#define GUC_STATUS _MMIO(0xc000)
#define GS_MIA_IN_RESET (1 << 0)
#define GS_RESET_SHIFT 0
#define GS_MIA_IN_RESET (0x01 << GS_RESET_SHIFT)
#define GS_BOOTROM_SHIFT 1
#define GS_BOOTROM_MASK (0x7F << GS_BOOTROM_SHIFT)
#define GS_BOOTROM_RSA_FAILED (0x50 << GS_BOOTROM_SHIFT)
#define GS_BOOTROM_JUMP_PASSED (0x76 << GS_BOOTROM_SHIFT)
#define GS_UKERNEL_SHIFT 8
#define GS_UKERNEL_MASK (0xFF << GS_UKERNEL_SHIFT)
#define GS_UKERNEL_LAPIC_DONE (0x30 << GS_UKERNEL_SHIFT)
@ -38,7 +40,13 @@
#define GS_UKERNEL_READY (0xF0 << GS_UKERNEL_SHIFT)
#define GS_MIA_SHIFT 16
#define GS_MIA_MASK (0x07 << GS_MIA_SHIFT)
#define GS_MIA_CORE_STATE (1 << GS_MIA_SHIFT)
#define GS_MIA_CORE_STATE (0x01 << GS_MIA_SHIFT)
#define GS_MIA_HALT_REQUESTED (0x02 << GS_MIA_SHIFT)
#define GS_MIA_ISR_ENTRY (0x04 << GS_MIA_SHIFT)
#define GS_AUTH_STATUS_SHIFT 30
#define GS_AUTH_STATUS_MASK (0x03 << GS_AUTH_STATUS_SHIFT)
#define GS_AUTH_STATUS_BAD (0x01 << GS_AUTH_STATUS_SHIFT)
#define GS_AUTH_STATUS_GOOD (0x02 << GS_AUTH_STATUS_SHIFT)
#define SOFT_SCRATCH(n) _MMIO(0xc180 + (n) * 4)
#define SOFT_SCRATCH_COUNT 16

40
drivers/gpu/drm/i915/intel_guc_loader.c
View file

@ -387,7 +387,7 @@ int intel_guc_ucode_load(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_guc_fw *guc_fw = &dev_priv->guc.guc_fw;
int err = 0;
int retries, err = 0;
if (!i915.enable_guc_submission)
return 0;
@ -441,29 +441,26 @@ int intel_guc_ucode_load(struct drm_device *dev)
* steppings also so this is extended as well.
*/
/* WaEnableGuCBootHashCheckNotSet:skl,bxt */
err = guc_ucode_xfer(dev_priv);
if (err) {
int retries = 3;
DRM_ERROR("GuC fw load failed, err=%d, attempting reset and retry\n", err);
while (retries--) {
err = i915_reset_guc(dev_priv);
if (err)
break;
err = guc_ucode_xfer(dev_priv);
if (!err) {
DRM_DEBUG_DRIVER("GuC fw reload succeeded after reset\n");
break;
}
DRM_DEBUG_DRIVER("GuC fw reload retries left: %d\n", retries);
}
for (retries = 3; ; ) {
/*
* Always reset the GuC just before (re)loading, so
* that the state and timing are fairly predictable
*/
err = i915_reset_guc(dev_priv);
if (err) {
DRM_ERROR("GuC fw reload attempt failed, ret=%d\n", err);
DRM_ERROR("GuC reset failed, err %d\n", err);
goto fail;
}
err = guc_ucode_xfer(dev_priv);
if (!err)
break;
if (--retries == 0)
goto fail;
DRM_INFO("GuC fw load failed, err %d; will reset and "
"retry %d more time(s)\n", err, retries);
}
guc_fw->guc_fw_load_status = GUC_FIRMWARE_SUCCESS;
@ -485,6 +482,7 @@ int intel_guc_ucode_load(struct drm_device *dev)
return 0;
fail:
DRM_ERROR("GuC firmware load failed, err %d\n", err);
if (guc_fw->guc_fw_load_status == GUC_FIRMWARE_PENDING)
guc_fw->guc_fw_load_status = GUC_FIRMWARE_FAIL;