diff options
Diffstat (limited to 'drivers/gpu/drm/i915/i915_drv.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_drv.c | 50 |
1 files changed, 48 insertions, 2 deletions
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c index e5b31e29382c..2ecac000e5da 100644 --- a/drivers/gpu/drm/i915/i915_drv.c +++ b/drivers/gpu/drm/i915/i915_drv.c @@ -1923,11 +1923,57 @@ error: * * Reset a specific GPU engine. Useful if a hang is detected. * Returns zero on successful reset or otherwise an error code. + * + * Procedure is: + * - identifies the request that caused the hang and it is dropped + * - reset engine (which will force the engine to idle) + * - re-init/configure engine */ int i915_reset_engine(struct intel_engine_cs *engine) { - /* FIXME: replace me with engine reset sequence */ - return -ENODEV; + struct i915_gpu_error *error = &engine->i915->gpu_error; + struct drm_i915_gem_request *active_request; + int ret; + + GEM_BUG_ON(!test_bit(I915_RESET_ENGINE + engine->id, &error->flags)); + + DRM_DEBUG_DRIVER("resetting %s\n", engine->name); + + active_request = i915_gem_reset_prepare_engine(engine); + if (IS_ERR(active_request)) { + DRM_DEBUG_DRIVER("Previous reset failed, promote to full reset\n"); + ret = PTR_ERR(active_request); + goto out; + } + + /* + * The request that caused the hang is stuck on elsp, we know the + * active request and can drop it, adjust head to skip the offending + * request to resume executing remaining requests in the queue. + */ + i915_gem_reset_engine(engine, active_request); + + /* Finally, reset just this engine. */ + ret = intel_gpu_reset(engine->i915, intel_engine_flag(engine)); + + i915_gem_reset_finish_engine(engine); + + if (ret) { + /* If we fail here, we expect to fallback to a global reset */ + DRM_DEBUG_DRIVER("Failed to reset %s, ret=%d\n", + engine->name, ret); + goto out; + } + + /* + * The engine and its registers (and workarounds in case of render) + * have been reset to their default values. Follow the init_ring + * process to program RING_MODE, HWSP and re-enable submission. + */ + ret = engine->init_hw(engine); + +out: + return ret; } static int i915_pm_suspend(struct device *kdev) |