diff options
| -rw-r--r-- | drivers/gpu/drm/i915/gem/i915_gem_context.c | 55 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/gem/i915_gem_context.h | 8 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/gem/i915_gem_context_types.h | 2 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/gem/selftests/huge_pages.c | 4 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c | 24 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/i915_trace.h | 2 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/selftests/i915_vma.c | 2 |
7 files changed, 22 insertions, 75 deletions
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c index 48ee96bf2643..c2ab0e22db0a 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_context.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c @@ -742,44 +742,6 @@ static int set_proto_ctx_param(struct drm_i915_file_private *fpriv, return ret; } -static struct i915_address_space * -context_get_vm_rcu(struct i915_gem_context *ctx) -{ - GEM_BUG_ON(!rcu_access_pointer(ctx->vm)); - - do { - struct i915_address_space *vm; - - /* - * We do not allow downgrading from full-ppgtt [to a shared - * global gtt], so ctx->vm cannot become NULL. - */ - vm = rcu_dereference(ctx->vm); - if (!kref_get_unless_zero(&vm->ref)) - continue; - - /* - * This ppgtt may have be reallocated between - * the read and the kref, and reassigned to a third - * context. In order to avoid inadvertent sharing - * of this ppgtt with that third context (and not - * src), we have to confirm that we have the same - * ppgtt after passing through the strong memory - * barrier implied by a successful - * kref_get_unless_zero(). - * - * Once we have acquired the current ppgtt of ctx, - * we no longer care if it is released from ctx, as - * it cannot be reallocated elsewhere. - */ - - if (vm == rcu_access_pointer(ctx->vm)) - return rcu_pointer_handoff(vm); - - i915_vm_put(vm); - } while (1); -} - static int intel_context_set_gem(struct intel_context *ce, struct i915_gem_context *ctx, struct intel_sseu sseu) @@ -990,7 +952,7 @@ static void i915_gem_context_release_work(struct work_struct *work) if (ctx->syncobj) drm_syncobj_put(ctx->syncobj); - vm = i915_gem_context_vm(ctx); + vm = ctx->vm; if (vm) i915_vm_put(vm); @@ -1216,7 +1178,7 @@ static void context_close(struct i915_gem_context *ctx) set_closed_name(ctx); - vm = i915_gem_context_vm(ctx); + vm = ctx->vm; if (vm) { /* i915_vm_close drops the final reference, which is a bit too * early and could result in surprises with concurrent @@ -1335,7 +1297,7 @@ i915_gem_create_context(struct drm_i915_private *i915, vm = &ppgtt->vm; } if (vm) { - RCU_INIT_POINTER(ctx->vm, i915_vm_open(vm)); + ctx->vm = i915_vm_open(vm); /* i915_vm_open() takes a reference */ i915_vm_put(vm); @@ -1561,15 +1523,12 @@ static int get_ppgtt(struct drm_i915_file_private *file_priv, if (!i915_gem_context_has_full_ppgtt(ctx)) return -ENODEV; - rcu_read_lock(); - vm = context_get_vm_rcu(ctx); - rcu_read_unlock(); - if (!vm) - return -ENODEV; + vm = ctx->vm; + GEM_BUG_ON(!vm); err = xa_alloc(&file_priv->vm_xa, &id, vm, xa_limit_32b, GFP_KERNEL); if (err) - goto err_put; + return err; i915_vm_open(vm); @@ -1577,8 +1536,6 @@ static int get_ppgtt(struct drm_i915_file_private *file_priv, args->value = id; args->size = 0; -err_put: - i915_vm_put(vm); return err; } diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.h b/drivers/gpu/drm/i915/gem/i915_gem_context.h index c50ded3d1cd3..d3279086a5e7 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_context.h +++ b/drivers/gpu/drm/i915/gem/i915_gem_context.h @@ -156,9 +156,9 @@ i915_gem_context_vm(struct i915_gem_context *ctx) static inline bool i915_gem_context_has_full_ppgtt(struct i915_gem_context *ctx) { - GEM_BUG_ON(!!rcu_access_pointer(ctx->vm) != HAS_FULL_PPGTT(ctx->i915)); + GEM_BUG_ON(!!ctx->vm != HAS_FULL_PPGTT(ctx->i915)); - return !!rcu_access_pointer(ctx->vm); + return !!ctx->vm; } static inline struct i915_address_space * @@ -166,12 +166,10 @@ i915_gem_context_get_eb_vm(struct i915_gem_context *ctx) { struct i915_address_space *vm; - rcu_read_lock(); - vm = rcu_dereference(ctx->vm); + vm = ctx->vm; if (!vm) vm = &ctx->i915->ggtt.vm; vm = i915_vm_get(vm); - rcu_read_unlock(); return vm; } diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context_types.h b/drivers/gpu/drm/i915/gem/i915_gem_context_types.h index 0c38789bd4a8..c4617e4d9fa9 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_context_types.h +++ b/drivers/gpu/drm/i915/gem/i915_gem_context_types.h @@ -262,7 +262,7 @@ struct i915_gem_context { * In other modes, this is a NULL pointer with the expectation that * the caller uses the shared global GTT. */ - struct i915_address_space __rcu *vm; + struct i915_address_space *vm; /** * @pid: process id of creator diff --git a/drivers/gpu/drm/i915/gem/selftests/huge_pages.c b/drivers/gpu/drm/i915/gem/selftests/huge_pages.c index 6c68fe26bb32..5d71626a1ee5 100644 --- a/drivers/gpu/drm/i915/gem/selftests/huge_pages.c +++ b/drivers/gpu/drm/i915/gem/selftests/huge_pages.c @@ -1688,11 +1688,9 @@ int i915_gem_huge_page_live_selftests(struct drm_i915_private *i915) goto out_file; } - mutex_lock(&ctx->mutex); - vm = i915_gem_context_vm(ctx); + vm = ctx->vm; if (vm) WRITE_ONCE(vm->scrub_64K, true); - mutex_unlock(&ctx->mutex); err = i915_subtests(tests, ctx); diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c index 1536c50144f8..b32f7fed2d9c 100644 --- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c +++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c @@ -27,12 +27,6 @@ #define DW_PER_PAGE (PAGE_SIZE / sizeof(u32)) -static inline struct i915_address_space *ctx_vm(struct i915_gem_context *ctx) -{ - /* single threaded, private ctx */ - return rcu_dereference_protected(ctx->vm, true); -} - static int live_nop_switch(void *arg) { const unsigned int nctx = 1024; @@ -813,7 +807,7 @@ static int igt_shared_ctx_exec(void *arg) struct i915_gem_context *ctx; struct intel_context *ce; - ctx = kernel_context(i915, ctx_vm(parent)); + ctx = kernel_context(i915, parent->vm); if (IS_ERR(ctx)) { err = PTR_ERR(ctx); goto out_test; @@ -823,7 +817,7 @@ static int igt_shared_ctx_exec(void *arg) GEM_BUG_ON(IS_ERR(ce)); if (!obj) { - obj = create_test_object(ctx_vm(parent), + obj = create_test_object(parent->vm, file, &objects); if (IS_ERR(obj)) { err = PTR_ERR(obj); @@ -1380,7 +1374,7 @@ static int igt_ctx_readonly(void *arg) goto out_file; } - vm = ctx_vm(ctx) ?: &i915->ggtt.alias->vm; + vm = ctx->vm ?: &i915->ggtt.alias->vm; if (!vm || !vm->has_read_only) { err = 0; goto out_file; @@ -1499,7 +1493,7 @@ static int write_to_scratch(struct i915_gem_context *ctx, GEM_BUG_ON(offset < I915_GTT_PAGE_SIZE); - err = check_scratch(ctx_vm(ctx), offset); + err = check_scratch(ctx->vm, offset); if (err) return err; @@ -1596,7 +1590,7 @@ static int read_from_scratch(struct i915_gem_context *ctx, GEM_BUG_ON(offset < I915_GTT_PAGE_SIZE); - err = check_scratch(ctx_vm(ctx), offset); + err = check_scratch(ctx->vm, offset); if (err) return err; @@ -1739,7 +1733,7 @@ static int check_scratch_page(struct i915_gem_context *ctx, u32 *out) u32 *vaddr; int err = 0; - vm = ctx_vm(ctx); + vm = ctx->vm; if (!vm) return -ENODEV; @@ -1801,7 +1795,7 @@ static int igt_vm_isolation(void *arg) } /* We can only test vm isolation, if the vm are distinct */ - if (ctx_vm(ctx_a) == ctx_vm(ctx_b)) + if (ctx_a->vm == ctx_b->vm) goto out_file; /* Read the initial state of the scratch page */ @@ -1813,8 +1807,8 @@ static int igt_vm_isolation(void *arg) if (err) goto out_file; - vm_total = ctx_vm(ctx_a)->total; - GEM_BUG_ON(ctx_vm(ctx_b)->total != vm_total); + vm_total = ctx_a->vm->total; + GEM_BUG_ON(ctx_b->vm->total != vm_total); count = 0; num_engines = 0; diff --git a/drivers/gpu/drm/i915/i915_trace.h b/drivers/gpu/drm/i915/i915_trace.h index 806ad688274b..237e5061381b 100644 --- a/drivers/gpu/drm/i915/i915_trace.h +++ b/drivers/gpu/drm/i915/i915_trace.h @@ -1246,7 +1246,7 @@ DECLARE_EVENT_CLASS(i915_context, TP_fast_assign( __entry->dev = ctx->i915->drm.primary->index; __entry->ctx = ctx; - __entry->vm = rcu_access_pointer(ctx->vm); + __entry->vm = ctx->vm; ), TP_printk("dev=%u, ctx=%p, ctx_vm=%p", diff --git a/drivers/gpu/drm/i915/selftests/i915_vma.c b/drivers/gpu/drm/i915/selftests/i915_vma.c index 79ba72da0813..1f10fe36619b 100644 --- a/drivers/gpu/drm/i915/selftests/i915_vma.c +++ b/drivers/gpu/drm/i915/selftests/i915_vma.c @@ -39,7 +39,7 @@ static bool assert_vma(struct i915_vma *vma, { bool ok = true; - if (vma->vm != rcu_access_pointer(ctx->vm)) { + if (vma->vm != ctx->vm) { pr_err("VMA created with wrong VM\n"); ok = false; } |