From f7096d40eea84d32eb1e3b0f2b4407167aae9a83 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Fri, 1 Dec 2017 12:20:11 +0000 Subject: [PATCH] drm/i915: Sleep and retry a GPU reset if at first we don't succeed As we declare the GPU wedged if the reset fails, such a failure is quite terminal. Before taking that drastic action, let's sleep first and try active, in the hope that the hardware has quietened down and is then able to reset. After a few such attempts, it is fair to say that the HW is truly wedged. v2: Always print the failure message now, we precheck whether resets are disabled. References: https://bugs.freedesktop.org/show_bug.cgi?id=104007 Signed-off-by: Chris Wilson Cc: Mika Kuoppala Cc: Joonas Lahtinen Link: https://patchwork.freedesktop.org/patch/msgid/20171201122011.16841-1-chris@chris-wilson.co.uk Reviewed-by: Mika Kuoppala --- drivers/gpu/drm/i915/i915_drv.c | 20 +++++++++++++++----- 1 file changed, 15 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c index 1c419893e3a9..43fbff48a133 100644 --- a/drivers/gpu/drm/i915/i915_drv.c +++ b/drivers/gpu/drm/i915/i915_drv.c @@ -1877,7 +1877,9 @@ void i915_reset(struct drm_i915_private *i915, unsigned int flags) { struct i915_gpu_error *error = &i915->gpu_error; int ret; + int i; + might_sleep(); lockdep_assert_held(&i915->drm.struct_mutex); GEM_BUG_ON(!test_bit(I915_RESET_BACKOFF, &error->flags)); @@ -1900,12 +1902,20 @@ void i915_reset(struct drm_i915_private *i915, unsigned int flags) goto error; } - ret = intel_gpu_reset(i915, ALL_ENGINES); + if (!intel_has_gpu_reset(i915)) { + DRM_DEBUG_DRIVER("GPU reset disabled\n"); + goto error; + } + + for (i = 0; i < 3; i++) { + ret = intel_gpu_reset(i915, ALL_ENGINES); + if (ret == 0) + break; + + msleep(100); + } if (ret) { - if (ret != -ENODEV) - DRM_ERROR("Failed to reset chip: %i\n", ret); - else - DRM_DEBUG_DRIVER("GPU reset disabled\n"); + dev_err(i915->drm.dev, "Failed to reset chip\n"); goto error; } -- 2.11.0