Re: [Intel-gfx] [PATCH v2 3/3] drm/i915/dgfx: Make failure to setup stolen non-fatal

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On 9/16/22 10:36 AM, Lucas De Marchi wrote:
There is no reason to consider the setup of Data Stolen Memory fatal on
dgfx and non-fatal on integrated. Move the debug and error propagation
around so both have the same behavior: non-fatal. Before this change,
loading i915 on a system with TGL + DG2 would result in just TGL
succeeding the initialization (without stolen).

Now loading i915 on the same system with an injected failure in
i915_gem_init_stolen():

	$ dmesg | grep stolen
	i915 0000:00:02.0: [drm] Injected failure, disabling use of stolen memory
	i915 0000:00:02.0: [drm:init_stolen_smem [i915]] Skip stolen region: failed to setup
	i915 0000:03:00.0: [drm] Injected failure, disabling use of stolen memory
	i915 0000:03:00.0: [drm:init_stolen_lmem [i915]] Skip stolen region: failed to setup

Both GPUs are still available:

	$ sudo build/tools/lsgpu
	card1                    Intel Dg2 (Gen12)                 drm:/dev/dri/card1
	└─renderD129                                               drm:/dev/dri/renderD129
	card0                    Intel Tigerlake (Gen12)           drm:/dev/dri/card0
	└─renderD128                                               drm:/dev/dri/renderD128

Signed-off-by: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>


Reviewed-by: Wayne Boyer <wayne.boyer@xxxxxxxxx>

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
index 6edf4e374f54..c5a4035c99cd 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
@@ -494,26 +494,26 @@ static int i915_gem_init_stolen(struct intel_memory_region *mem)
  		drm_notice(&i915->drm,
  			   "%s, disabling use of stolen memory\n",
  			   "iGVT-g active");
-		return 0;
+		return -ENOSPC;
  	}
if (i915_vtd_active(i915) && GRAPHICS_VER(i915) < 8) {
  		drm_notice(&i915->drm,
  			   "%s, disabling use of stolen memory\n",
  			   "DMAR active");
-		return 0;
+		return -ENOSPC;
  	}
if (adjust_stolen(i915, &mem->region))
-		return 0;
+		return -ENOSPC;
if (request_smem_stolen(i915, &mem->region))
-		return 0;
+		return -ENOSPC;
i915->dsm = mem->region; if (init_reserved_stolen(i915))
-		return 0;
+		return -ENOSPC;
/* Exclude the reserved region from driver use */
  	mem->region.end = i915->dsm_reserved.start - 1;
@@ -527,7 +527,7 @@ static int i915_gem_init_stolen(struct intel_memory_region *mem)
  		(u64)i915->stolen_usable_size >> 10);
if (i915->stolen_usable_size == 0)
-		return 0;
+		return -ENOSPC;
/* Basic memrange allocator for stolen space. */
  	drm_mm_init(&i915->mm.stolen, 0, i915->stolen_usable_size);
@@ -765,11 +765,17 @@ i915_gem_object_create_stolen(struct drm_i915_private *i915,
static int init_stolen_smem(struct intel_memory_region *mem)
  {
+	int err;
+
  	/*
  	 * Initialise stolen early so that we may reserve preallocated
  	 * objects for the BIOS to KMS transition.
  	 */
-	return i915_gem_init_stolen(mem);
+	err = i915_gem_init_stolen(mem);
+	if (err)
+		drm_dbg(&mem->i915->drm, "Skip stolen region: failed to setup\n");
+
+	return 0;
  }
static int release_stolen_smem(struct intel_memory_region *mem)
@@ -786,21 +792,25 @@ static const struct intel_memory_region_ops i915_region_stolen_smem_ops = {
static int init_stolen_lmem(struct intel_memory_region *mem)
  {
+	struct drm_i915_private *i915 = mem->i915;
  	int err;
if (GEM_WARN_ON(resource_size(&mem->region) == 0))
-		return -ENODEV;
+		return 0;
err = i915_gem_init_stolen(mem);
-	if (err)
-		return err;
+	if (err) {
+		drm_dbg(&mem->i915->drm, "Skip stolen region: failed to setup\n");
+		return 0;
+	}
- if (mem->io_size && !io_mapping_init_wc(&mem->iomap,
-						mem->io_start,
-						mem->io_size)) {
-		err = -EIO;
+	if (mem->io_size &&
+	    !io_mapping_init_wc(&mem->iomap, mem->io_start, mem->io_size))
  		goto err_cleanup;
-	}
+
+	drm_dbg(&i915->drm, "Stolen Local memory IO start: %pa\n",
+		&mem->io_start);
+	drm_dbg(&i915->drm, "Stolen Local DSM base: %pa\n", &mem->region.start);
return 0; @@ -874,16 +884,6 @@ i915_gem_stolen_lmem_setup(struct drm_i915_private *i915, u16 type,
  	if (IS_ERR(mem))
  		return mem;
- /*
-	 * TODO: consider creating common helper to just print all the
-	 * interesting stuff from intel_memory_region, which we can use for all
-	 * our probed regions.
-	 */
-
-	drm_dbg(&i915->drm, "Stolen Local memory IO start: %pa\n",
-		&mem->io_start);
-	drm_dbg(&i915->drm, "Stolen Local DSM base: %pa\n", &dsm_base);
-
  	intel_memory_region_set_name(mem, "stolen-local");
mem->private = true;
@@ -908,6 +908,7 @@ i915_gem_stolen_smem_setup(struct drm_i915_private *i915, u16 type,
  	intel_memory_region_set_name(mem, "stolen-system");
mem->private = true;
+
  	return mem;
  }

--
--
Wayne Boyer
Graphics Software Engineer
VTT-OSGC Platform Enablement



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