On Thu, May 04, 2017 at 09:26:35PM +0000, Srivatsa, Anusha wrote:
> >+void i915_guc_load_error_log_capture(struct drm_i915_private *i915) {
> >+ void *log, *buf;
> >+ struct i915_vma *vma = i915->guc.log.vma;
> >+
> >+ if (i915->gpu_error.guc_load_fail_log || !vma)
> >+ return;
> >+
> >+ /*
> >+ * the vma should be already pinned and mapped for log runtime
> >+ * management but let's play safe
> >+ */
> >+ log = i915_gem_object_pin_map(vma->obj, I915_MAP_WC);
> >+ if (IS_ERR(log)) {
> >+ DRM_ERROR("Failed to pin guc_log vma\n");
> >+ return;
> >+ }
> >+
> >+ buf = kzalloc(GUC_LOG_SIZE, GFP_KERNEL);
> >+ if (buf) {
> >+ memcpy(buf, log, GUC_LOG_SIZE);
> >+ i915->gpu_error.guc_load_fail_log = buf;
> >+ } else {
> >+ DRM_ERROR("Failed to copy guc log\n");
> >+ }
> >+
> >+ i915_gem_object_unpin_map(vma->obj);
You are trading a swappable object for unswappable kernel memory. If you
want to have the guc log after guc is disabled, just keep the log object
around.
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
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