GuC and HuC depend on struct_mutex for device
reinitialization. Moving away from this dependency
requires perma-pinning the firmware images in GGTT.
The upper portion of the GuC address space has
a sizeable hole (several MB) that is inaccessible
by GuC. Reserve this range within GGTT as it can
comfortably hold GuC/HuC firmware images.
Signed-off-by: Fernando Pacheco <fernando.pacheco@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_gem_gtt.c | 25 ++++++++++++++++++++++---
drivers/gpu/drm/i915/i915_gem_gtt.h | 1 +
drivers/gpu/drm/i915/intel_guc.h | 11 +++++++++++
3 files changed, 34 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 736c845eb77f..30f294a07e6d 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -2747,6 +2747,18 @@ int i915_gem_init_ggtt(struct drm_i915_private *dev_priv)
if (ret)
return ret;
+ /* Reserve a mappable slot for our lockless uC firmware load */
+ if (USES_GUC(dev_priv)) {
+ ret = drm_mm_insert_node_in_range(&ggtt->vm.mm, &ggtt->uc_fw,
+ GUC_GGTT_FW_SIZE, 0,
+ I915_COLOR_UNEVICTABLE,
+ GUC_GGTT_FW_START,
+ GUC_GGTT_FW_END,
+ DRM_MM_INSERT_LOW);
+ if (ret)
+ goto err_node;
+ }
+
/* Clear any non-preallocated blocks */
drm_mm_for_each_hole(entry, &ggtt->vm.mm, hole_start, hole_end) {
DRM_DEBUG_KMS("clearing unused GTT space: [%lx, %lx]\n",
@@ -2761,12 +2773,15 @@ int i915_gem_init_ggtt(struct drm_i915_private *dev_priv)
if (INTEL_PPGTT(dev_priv) == INTEL_PPGTT_ALIASING) {
ret = i915_gem_init_aliasing_ppgtt(dev_priv);
if (ret)
- goto err;
+ goto err_appgtt;
}
return 0;
-err:
+err_appgtt:
+ if (USES_GUC(dev_priv))
+ drm_mm_remove_node(&ggtt->uc_fw);
+err_node:
drm_mm_remove_node(&ggtt->error_capture);
return ret;
}
@@ -2792,6 +2807,9 @@ void i915_ggtt_cleanup_hw(struct drm_i915_private *dev_priv)
if (drm_mm_node_allocated(&ggtt->error_capture))
drm_mm_remove_node(&ggtt->error_capture);
+ if (drm_mm_node_allocated(&ggtt->uc_fw))
+ drm_mm_remove_node(&ggtt->uc_fw);
+
if (drm_mm_initialized(&ggtt->vm.mm)) {
intel_vgt_deballoon(dev_priv);
i915_address_space_fini(&ggtt->vm);
@@ -3370,7 +3388,8 @@ int i915_ggtt_probe_hw(struct drm_i915_private *dev_priv)
* restriction!
*/
if (USES_GUC(dev_priv)) {
- ggtt->vm.total = min_t(u64, ggtt->vm.total, GUC_GGTT_TOP);
+ ggtt->vm.total = min_t(u64, ggtt->vm.total,
+ GUC_GGTT_RESERVED_END);
ggtt->mappable_end =
min_t(u64, ggtt->mappable_end, ggtt->vm.total);
}
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.h b/drivers/gpu/drm/i915/i915_gem_gtt.h
index f597f35b109b..b51e779732c3 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.h
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.h
@@ -384,6 +384,7 @@ struct i915_ggtt {
u32 pin_bias;
struct drm_mm_node error_capture;
+ struct drm_mm_node uc_fw;
};
struct i915_hw_ppgtt {
diff --git a/drivers/gpu/drm/i915/intel_guc.h b/drivers/gpu/drm/i915/intel_guc.h
index 2c59ff8d9f39..b30cc2642fc4 100644
--- a/drivers/gpu/drm/i915/intel_guc.h
+++ b/drivers/gpu/drm/i915/intel_guc.h
@@ -127,6 +127,17 @@ static inline void intel_guc_to_host_event_handler(struct intel_guc *guc)
/* GuC addresses above GUC_GGTT_TOP also don't map through the GTT */
#define GUC_GGTT_TOP 0xFEE00000
+/*
+ * This portion of the address space is inaccessible by GuC,
+ * but still accessible by DMA. We can repurpose this portion
+ * to house the uC firmware images and perform the image upload.
+ */
+#define GUC_GGTT_FW_START GUC_GGTT_TOP
+#define GUC_GGTT_FW_END 0xFFE00000
+#define GUC_GGTT_RESERVED_END GUC_GGTT_FW_END
+
+#define GUC_GGTT_FW_SIZE (GUC_GGTT_FW_END - GUC_GGTT_FW_START)
+
/**
* intel_guc_ggtt_offset() - Get and validate the GGTT offset of @vma
* @guc: intel_guc structure.
--
2.21.0
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