From: Michal Wajdeczko Date: Sun, 11 Aug 2019 19:51:32 +0000 (+0000) Subject: drm/i915/uc: Use -EIO code for GuC initialization failures X-Git-Tag: v5.4-rc1~32^2~13^2~110 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=a5f978c3609f02ae0ccff1bf010b32e41707ef66;p=platform%2Fkernel%2Flinux-rpi.git drm/i915/uc: Use -EIO code for GuC initialization failures Since commit 6ca9a2beb54a ("drm/i915: Unwind i915_gem_init() failure") we believed that we correctly handle all errors encountered during GuC initialization, including special one that indicates request to run driver with disabled GPU submission (-EIO). Unfortunately since commit 121981fafe69 ("drm/i915/guc: Combine enable_guc_loading|submission modparams") we stopped using that error code to avoid unwanted fallback to execlist submission mode. In result any GuC initialization failure was treated as non-recoverable error leading to driver load abort, so we could not even read related GuC error log to investigate cause of the problem. For now always return -EIO on any uC hardware related failure. Signed-off-by: Michal Wajdeczko Cc: Daniele Ceraolo Spurio Cc: Chris Wilson Reviewed-by: Chris Wilson Signed-off-by: Chris Wilson Link: https://patchwork.freedesktop.org/patch/msgid/20190811195132.9660-5-michal.wajdeczko@intel.com --- diff --git a/drivers/gpu/drm/i915/gt/uc/intel_uc.c b/drivers/gpu/drm/i915/gt/uc/intel_uc.c index a3a5918..22fa88a 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_uc.c +++ b/drivers/gpu/drm/i915/gt/uc/intel_uc.c @@ -530,15 +530,10 @@ err_log_capture: err_out: __uc_sanitize(uc); - /* - * Note that there is no fallback as either user explicitly asked for - * the GuC or driver default option was to run with the GuC enabled. - */ - if (GEM_WARN_ON(ret == -EIO)) - ret = -EINVAL; - i915_probe_error(i915, "GuC initialization failed %d\n", ret); - return ret; + + /* We want to keep KMS alive */ + return -EIO; } void intel_uc_fini_hw(struct intel_uc *uc) diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index 6ff01a4..4752a3b 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -1463,8 +1463,10 @@ int i915_gem_init(struct drm_i915_private *dev_priv) intel_init_gt_powersave(dev_priv); ret = intel_uc_init(&dev_priv->gt.uc); - if (ret) + if (ret) { + GEM_BUG_ON(ret == -EIO); goto err_pm; + } ret = i915_gem_init_hw(dev_priv); if (ret) @@ -1526,7 +1528,8 @@ err_gt: err_init_hw: intel_uc_fini_hw(&dev_priv->gt.uc); err_uc_init: - intel_uc_fini(&dev_priv->gt.uc); + if (ret != -EIO) + intel_uc_fini(&dev_priv->gt.uc); err_pm: if (ret != -EIO) { intel_cleanup_gt_powersave(dev_priv); @@ -1542,9 +1545,8 @@ err_unlock: intel_uncore_forcewake_put(&dev_priv->uncore, FORCEWAKE_ALL); mutex_unlock(&dev_priv->drm.struct_mutex); - intel_uc_cleanup_firmwares(&dev_priv->gt.uc); - if (ret != -EIO) { + intel_uc_cleanup_firmwares(&dev_priv->gt.uc); i915_gem_cleanup_userptr(dev_priv); intel_timelines_fini(dev_priv); } @@ -1553,8 +1555,8 @@ err_unlock: mutex_lock(&dev_priv->drm.struct_mutex); /* - * Allow engine initialisation to fail by marking the GPU as - * wedged. But we only want to do this where the GPU is angry, + * Allow engines or uC initialisation to fail by marking the GPU + * as wedged. But we only want to do this when the GPU is angry, * for all other failure, such as an allocation failure, bail. */ if (!intel_gt_is_wedged(&dev_priv->gt)) {