From: Chris Wilson <chris.p.wilson@xxxxxxxxx> commit 20e377e7b2e7c327039f10db80ba5bcc1f6c882d upstream. Now that the scratch page and page directories have a reference back to the i915_address_space, we cannot do an immediate free of the ppgtt upon error as those buffer objects will perform a later i915_vm_put in their deferred frees. The downside is that by replacing the onion unwind along the error paths, the ppgtt cleanup must handle a partially constructed vm. This includes ensuring that the vm->cleanup is set prior to the error path. Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/6900 Signed-off-by: Chris Wilson <chris.p.wilson@xxxxxxxxx> Fixes: 4d8151ae5329 ("drm/i915: Don't free shared locks while shared") Cc: Thomas Hellström <thomas.hellstrom@xxxxxxxxxxxxxxx> Cc: Matthew Auld <matthew.auld@xxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> # v5.14+ Reviewed-by: Matthew Auld <matthew.auld@xxxxxxxxx> Signed-off-by: Matthew Auld <matthew.auld@xxxxxxxxx> Link: https://patchwork.freedesktop.org/patch/msgid/20220926153333.102195-1-matthew.auld@xxxxxxxxx (cherry picked from commit c286558f58535cf97b717b946d6c96d774a09d17) Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/gpu/drm/i915/gt/gen6_ppgtt.c | 16 ++++----- drivers/gpu/drm/i915/gt/gen8_ppgtt.c | 58 ++++++++++++++++++----------------- drivers/gpu/drm/i915/gt/intel_gtt.c | 3 + 3 files changed, 41 insertions(+), 36 deletions(-) --- a/drivers/gpu/drm/i915/gt/gen6_ppgtt.c +++ b/drivers/gpu/drm/i915/gt/gen6_ppgtt.c @@ -247,6 +247,7 @@ err_scratch1: i915_gem_object_put(vm->scratch[1]); err_scratch0: i915_gem_object_put(vm->scratch[0]); + vm->scratch[0] = NULL; return ret; } @@ -268,9 +269,10 @@ static void gen6_ppgtt_cleanup(struct i9 gen6_ppgtt_free_pd(ppgtt); free_scratch(vm); - mutex_destroy(&ppgtt->flush); + if (ppgtt->base.pd) + free_pd(&ppgtt->base.vm, ppgtt->base.pd); - free_pd(&ppgtt->base.vm, ppgtt->base.pd); + mutex_destroy(&ppgtt->flush); } static void pd_vma_bind(struct i915_address_space *vm, @@ -449,19 +451,17 @@ struct i915_ppgtt *gen6_ppgtt_create(str err = gen6_ppgtt_init_scratch(ppgtt); if (err) - goto err_free; + goto err_put; ppgtt->base.pd = gen6_alloc_top_pd(ppgtt); if (IS_ERR(ppgtt->base.pd)) { err = PTR_ERR(ppgtt->base.pd); - goto err_scratch; + goto err_put; } return &ppgtt->base; -err_scratch: - free_scratch(&ppgtt->base.vm); -err_free: - kfree(ppgtt); +err_put: + i915_vm_put(&ppgtt->base.vm); return ERR_PTR(err); } --- a/drivers/gpu/drm/i915/gt/gen8_ppgtt.c +++ b/drivers/gpu/drm/i915/gt/gen8_ppgtt.c @@ -196,7 +196,10 @@ static void gen8_ppgtt_cleanup(struct i9 if (intel_vgpu_active(vm->i915)) gen8_ppgtt_notify_vgt(ppgtt, false); - __gen8_ppgtt_cleanup(vm, ppgtt->pd, gen8_pd_top_count(vm), vm->top); + if (ppgtt->pd) + __gen8_ppgtt_cleanup(vm, ppgtt->pd, + gen8_pd_top_count(vm), vm->top); + free_scratch(vm); } @@ -803,8 +806,10 @@ static int gen8_init_scratch(struct i915 struct drm_i915_gem_object *obj; obj = vm->alloc_pt_dma(vm, I915_GTT_PAGE_SIZE_4K); - if (IS_ERR(obj)) + if (IS_ERR(obj)) { + ret = PTR_ERR(obj); goto free_scratch; + } ret = map_pt_dma(vm, obj); if (ret) { @@ -823,7 +828,8 @@ static int gen8_init_scratch(struct i915 free_scratch: while (i--) i915_gem_object_put(vm->scratch[i]); - return -ENOMEM; + vm->scratch[0] = NULL; + return ret; } static int gen8_preallocate_top_level_pdp(struct i915_ppgtt *ppgtt) @@ -901,6 +907,7 @@ err_pd: struct i915_ppgtt *gen8_ppgtt_create(struct intel_gt *gt, unsigned long lmem_pt_obj_flags) { + struct i915_page_directory *pd; struct i915_ppgtt *ppgtt; int err; @@ -946,21 +953,7 @@ struct i915_ppgtt *gen8_ppgtt_create(str ppgtt->vm.alloc_scratch_dma = alloc_pt_dma; } - err = gen8_init_scratch(&ppgtt->vm); - if (err) - goto err_free; - - ppgtt->pd = gen8_alloc_top_pd(&ppgtt->vm); - if (IS_ERR(ppgtt->pd)) { - err = PTR_ERR(ppgtt->pd); - goto err_free_scratch; - } - - if (!i915_vm_is_4lvl(&ppgtt->vm)) { - err = gen8_preallocate_top_level_pdp(ppgtt); - if (err) - goto err_free_pd; - } + ppgtt->vm.pte_encode = gen8_pte_encode; ppgtt->vm.bind_async_flags = I915_VMA_LOCAL_BIND; ppgtt->vm.insert_entries = gen8_ppgtt_insert; @@ -971,22 +964,31 @@ struct i915_ppgtt *gen8_ppgtt_create(str ppgtt->vm.allocate_va_range = gen8_ppgtt_alloc; ppgtt->vm.clear_range = gen8_ppgtt_clear; ppgtt->vm.foreach = gen8_ppgtt_foreach; + ppgtt->vm.cleanup = gen8_ppgtt_cleanup; - ppgtt->vm.pte_encode = gen8_pte_encode; + err = gen8_init_scratch(&ppgtt->vm); + if (err) + goto err_put; + + pd = gen8_alloc_top_pd(&ppgtt->vm); + if (IS_ERR(pd)) { + err = PTR_ERR(pd); + goto err_put; + } + ppgtt->pd = pd; + + if (!i915_vm_is_4lvl(&ppgtt->vm)) { + err = gen8_preallocate_top_level_pdp(ppgtt); + if (err) + goto err_put; + } if (intel_vgpu_active(gt->i915)) gen8_ppgtt_notify_vgt(ppgtt, true); - ppgtt->vm.cleanup = gen8_ppgtt_cleanup; - return ppgtt; -err_free_pd: - __gen8_ppgtt_cleanup(&ppgtt->vm, ppgtt->pd, - gen8_pd_top_count(&ppgtt->vm), ppgtt->vm.top); -err_free_scratch: - free_scratch(&ppgtt->vm); -err_free: - kfree(ppgtt); +err_put: + i915_vm_put(&ppgtt->vm); return ERR_PTR(err); } --- a/drivers/gpu/drm/i915/gt/intel_gtt.c +++ b/drivers/gpu/drm/i915/gt/intel_gtt.c @@ -405,6 +405,9 @@ void free_scratch(struct i915_address_sp { int i; + if (!vm->scratch[0]) + return; + for (i = 0; i <= vm->top; i++) i915_gem_object_put(vm->scratch[i]); }
