drm/i915/guc: Avoid reclaim locks during reset

During reset, we must be very selective in which locks we take as most
are tainted by being held across a wait or reclaim (kmalloc) which
implicitly waits. Inside the guc reset path, we reset the ADS to sane
defaults, but must keep it pinned from initialisation to avoid having to
pin it during reset.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190701100502.15639-1-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/i915/intel_guc.h b/drivers/gpu/drm/i915/intel_guc.h
index d6a75bc3d7f4624a3c2095e0b861b5090d5de334..d91c96679dbb991275f72d43da0f5b9d90cad22e 100644 (file)
--- a/drivers/gpu/drm/i915/intel_guc.h
+++ b/drivers/gpu/drm/i915/intel_guc.h
@@ -35,6 +35,8 @@
 #include "i915_utils.h"
 #include "i915_vma.h"
 
+struct __guc_ads_blob;
+
 struct guc_preempt_work {
        struct work_struct work;
        struct intel_engine_cs *engine;
@@ -65,6 +67,8 @@ struct intel_guc {
        } interrupts;
 
        struct i915_vma *ads_vma;
+       struct __guc_ads_blob *ads_blob;
+
        struct i915_vma *stage_desc_pool;
        void *stage_desc_pool_vaddr;
        struct ida stage_ids;

diff --git a/drivers/gpu/drm/i915/intel_guc_ads.c b/drivers/gpu/drm/i915/intel_guc_ads.c
index ecb69fc942185b831de2b22cab7bc36abfd83542..69859d1e047fed78897da8753c0b76c06650afd7 100644 (file)
--- a/drivers/gpu/drm/i915/intel_guc_ads.c
+++ b/drivers/gpu/drm/i915/intel_guc_ads.c
@@ -83,18 +83,14 @@ struct __guc_ads_blob {
        u8 reg_state_buffer[GUC_S3_SAVE_SPACE_PAGES * PAGE_SIZE];
 } __packed;
 
-static int __guc_ads_init(struct intel_guc *guc)
+static void __guc_ads_init(struct intel_guc *guc)
 {
        struct drm_i915_private *dev_priv = guc_to_i915(guc);
-       struct __guc_ads_blob *blob;
+       struct __guc_ads_blob *blob = guc->ads_blob;
        const u32 skipped_size = LRC_PPHWSP_SZ * PAGE_SIZE + LR_HW_CONTEXT_SIZE;
        u32 base;
        u8 engine_class;
 
-       blob = i915_gem_object_pin_map(guc->ads_vma->obj, I915_MAP_WB);
-       if (IS_ERR(blob))
-               return PTR_ERR(blob);
-
        /* GuC scheduling policies */
        guc_policies_init(&blob->policies);
 
@@ -144,9 +140,7 @@ static int __guc_ads_init(struct intel_guc *guc)
        blob->ads.gt_system_info = base + ptr_offset(blob, system_info);
        blob->ads.clients_info = base + ptr_offset(blob, clients_info);
 
-       i915_gem_object_unpin_map(guc->ads_vma->obj);
-
-       return 0;
+       i915_gem_object_flush_map(guc->ads_vma->obj);
 }
 
 /**
@@ -160,6 +154,7 @@ int intel_guc_ads_create(struct intel_guc *guc)
 {
        const u32 size = PAGE_ALIGN(sizeof(struct __guc_ads_blob));
        struct i915_vma *vma;
+       void *blob;
        int ret;
 
        GEM_BUG_ON(guc->ads_vma);
@@ -168,11 +163,16 @@ int intel_guc_ads_create(struct intel_guc *guc)
        if (IS_ERR(vma))
                return PTR_ERR(vma);
 
+       blob = i915_gem_object_pin_map(vma->obj, I915_MAP_WB);
+       if (IS_ERR(blob)) {
+               ret = PTR_ERR(blob);
+               goto err_vma;
+       }
+
        guc->ads_vma = vma;
+       guc->ads_blob = blob;
 
-       ret = __guc_ads_init(guc);
-       if (ret)
-               goto err_vma;
+       __guc_ads_init(guc);
 
        return 0;
 
@@ -183,7 +183,7 @@ int intel_guc_ads_create(struct intel_guc *guc)
 
 void intel_guc_ads_destroy(struct intel_guc *guc)
 {
-       i915_vma_unpin_and_release(&guc->ads_vma, 0);
+       i915_vma_unpin_and_release(&guc->ads_vma, I915_VMA_RELEASE_MAP);
 }
 
 /**