Commit fa812ce9 authored by Chris Wilson's avatar Chris Wilson

drm/i915/gt: Onion unwind for scratch page allocation failure

In switching to using objects for our ppGTT scratch pages, care was not
taken to avoid trying to unref NULL objects on failure. And for gen6
ppGTT, it appears we forgot entirely to unwind after a partial allocation
failure.

Fixes: 89351925 ("drm/i915/gt: Switch to object allocations for page directories")
Signed-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
Cc: Matthew Auld <matthew.auld@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: default avatarMatthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201019083444.1286-1-chris@chris-wilson.co.uk
parent 178536b8
...@@ -239,18 +239,24 @@ static int gen6_ppgtt_init_scratch(struct gen6_ppgtt *ppgtt) ...@@ -239,18 +239,24 @@ static int gen6_ppgtt_init_scratch(struct gen6_ppgtt *ppgtt)
I915_CACHE_NONE, PTE_READ_ONLY); I915_CACHE_NONE, PTE_READ_ONLY);
vm->scratch[1] = vm->alloc_pt_dma(vm, I915_GTT_PAGE_SIZE_4K); vm->scratch[1] = vm->alloc_pt_dma(vm, I915_GTT_PAGE_SIZE_4K);
if (IS_ERR(vm->scratch[1])) if (IS_ERR(vm->scratch[1])) {
return PTR_ERR(vm->scratch[1]); ret = PTR_ERR(vm->scratch[1]);
goto err_scratch0;
}
ret = pin_pt_dma(vm, vm->scratch[1]); ret = pin_pt_dma(vm, vm->scratch[1]);
if (ret) { if (ret)
i915_gem_object_put(vm->scratch[1]); goto err_scratch1;
return ret;
}
fill32_px(vm->scratch[1], vm->scratch[0]->encode); fill32_px(vm->scratch[1], vm->scratch[0]->encode);
return 0; return 0;
err_scratch1:
i915_gem_object_put(vm->scratch[1]);
err_scratch0:
i915_gem_object_put(vm->scratch[0]);
return ret;
} }
static void gen6_ppgtt_free_pd(struct gen6_ppgtt *ppgtt) static void gen6_ppgtt_free_pd(struct gen6_ppgtt *ppgtt)
......
...@@ -607,7 +607,8 @@ static int gen8_init_scratch(struct i915_address_space *vm) ...@@ -607,7 +607,8 @@ static int gen8_init_scratch(struct i915_address_space *vm)
return 0; return 0;
free_scratch: free_scratch:
free_scratch(vm); while (i--)
i915_gem_object_put(vm->scratch[i]);
return -ENOMEM; return -ENOMEM;
} }
......
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