diff mbox series

[v3,14/63] drm/i915: Reject UNSYNCHRONIZED for userptr

Message ID 20201015112627.1142745-15-maarten.lankhorst@linux.intel.com
State New, archived
Headers show
Series drm/i915: Remove obj->mm.lock! | expand

Commit Message

Maarten Lankhorst Oct. 15, 2020, 11:25 a.m. UTC
We should not allow this any more, as it will break with the new userptr
implementation, it could still be made to work, but there's no point in
doing so.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
---
 .../gpu/drm/i915/gem/i915_gem_execbuffer.c    |  2 +
 drivers/gpu/drm/i915/gem/i915_gem_object.h    |  4 ++
 .../gpu/drm/i915/gem/i915_gem_object_types.h  |  2 +
 drivers/gpu/drm/i915/gem/i915_gem_userptr.c   | 64 ++++++-------------
 drivers/gpu/drm/i915/i915_drv.h               |  2 +
 5 files changed, 31 insertions(+), 43 deletions(-)
diff mbox series

Patch

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
index ea2242f1b5b8..c30fa5790a47 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
@@ -1966,8 +1966,10 @@  static noinline int eb_relocate_parse_slow(struct i915_execbuffer *eb,
 		err = 0;
 	}
 
+#ifdef CONFIG_MMU_NOTIFIER
 	if (!err)
 		flush_workqueue(eb->i915->mm.userptr_wq);
+#endif
 
 err_relock:
 	i915_gem_ww_ctx_init(&eb->ww, true);
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.h b/drivers/gpu/drm/i915/gem/i915_gem_object.h
index 436ff0d4951f..a3774e80aedd 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object.h
@@ -531,7 +531,11 @@  void __i915_gem_object_invalidate_frontbuffer(struct drm_i915_gem_object *obj,
 static inline bool
 i915_gem_object_is_userptr(struct drm_i915_gem_object *obj)
 {
+#ifdef CONFIG_MMU_NOTIFIER
 	return obj->userptr.mm;
+#else
+	return false;
+#endif
 }
 
 static inline void
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object_types.h b/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
index e84b279bfee6..1f729e63867c 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
@@ -289,6 +289,7 @@  struct drm_i915_gem_object {
 	unsigned long *bit_17;
 
 	union {
+#ifdef CONFIG_MMU_NOTIFIER
 		struct i915_gem_userptr {
 			uintptr_t ptr;
 
@@ -296,6 +297,7 @@  struct drm_i915_gem_object {
 			struct i915_mmu_object *mmu_object;
 			struct work_struct *work;
 		} userptr;
+#endif
 
 		unsigned long scratch;
 		u64 encode;
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_userptr.c b/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
index 3fd63fdd7466..a2b7f6db2f1a 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
@@ -15,6 +15,8 @@ 
 #include "i915_gem_object.h"
 #include "i915_scatterlist.h"
 
+#if defined(CONFIG_MMU_NOTIFIER)
+
 struct i915_mm_struct {
 	struct mm_struct *mm;
 	struct drm_i915_private *i915;
@@ -24,7 +26,6 @@  struct i915_mm_struct {
 	struct rcu_work work;
 };
 
-#if defined(CONFIG_MMU_NOTIFIER)
 #include <linux/interval_tree.h>
 
 struct i915_mmu_notifier {
@@ -217,15 +218,11 @@  i915_mmu_notifier_find(struct i915_mm_struct *mm)
 }
 
 static int
-i915_gem_userptr_init__mmu_notifier(struct drm_i915_gem_object *obj,
-				    unsigned flags)
+i915_gem_userptr_init__mmu_notifier(struct drm_i915_gem_object *obj)
 {
 	struct i915_mmu_notifier *mn;
 	struct i915_mmu_object *mo;
 
-	if (flags & I915_USERPTR_UNSYNCHRONIZED)
-		return capable(CAP_SYS_ADMIN) ? 0 : -EPERM;
-
 	if (GEM_WARN_ON(!obj->userptr.mm))
 		return -EINVAL;
 
@@ -258,38 +255,6 @@  i915_mmu_notifier_free(struct i915_mmu_notifier *mn,
 	kfree(mn);
 }
 
-#else
-
-static void
-__i915_gem_userptr_set_active(struct drm_i915_gem_object *obj, bool value)
-{
-}
-
-static void
-i915_gem_userptr_release__mmu_notifier(struct drm_i915_gem_object *obj)
-{
-}
-
-static int
-i915_gem_userptr_init__mmu_notifier(struct drm_i915_gem_object *obj,
-				    unsigned flags)
-{
-	if ((flags & I915_USERPTR_UNSYNCHRONIZED) == 0)
-		return -ENODEV;
-
-	if (!capable(CAP_SYS_ADMIN))
-		return -EPERM;
-
-	return 0;
-}
-
-static void
-i915_mmu_notifier_free(struct i915_mmu_notifier *mn,
-		       struct mm_struct *mm)
-{
-}
-
-#endif
 
 static struct i915_mm_struct *
 __i915_mm_struct_find(struct drm_i915_private *i915, struct mm_struct *real)
@@ -731,6 +696,8 @@  static const struct drm_i915_gem_object_ops i915_gem_userptr_ops = {
 	.release = i915_gem_userptr_release,
 };
 
+#endif
+
 /*
  * Creates a new mm object that wraps some normal memory from the process
  * context - user memory.
@@ -771,12 +738,12 @@  i915_gem_userptr_ioctl(struct drm_device *dev,
 		       void *data,
 		       struct drm_file *file)
 {
-	static struct lock_class_key lock_class;
+	static struct lock_class_key __maybe_unused lock_class;
 	struct drm_i915_private *dev_priv = to_i915(dev);
 	struct drm_i915_gem_userptr *args = data;
-	struct drm_i915_gem_object *obj;
-	int ret;
-	u32 handle;
+	struct drm_i915_gem_object __maybe_unused *obj;
+	int __maybe_unused ret;
+	u32 __maybe_unused handle;
 
 	if (!HAS_LLC(dev_priv) && !HAS_SNOOP(dev_priv)) {
 		/* We cannot support coherent userptr objects on hw without
@@ -815,6 +782,9 @@  i915_gem_userptr_ioctl(struct drm_device *dev,
 	if (!access_ok((char __user *)(unsigned long)args->user_ptr, args->user_size))
 		return -EFAULT;
 
+	if (args->flags & I915_USERPTR_UNSYNCHRONIZED)
+		return -ENODEV;
+
 	if (args->flags & I915_USERPTR_READ_ONLY) {
 		/*
 		 * On almost all of the older hw, we cannot tell the GPU that
@@ -824,6 +794,7 @@  i915_gem_userptr_ioctl(struct drm_device *dev,
 			return -ENODEV;
 	}
 
+#ifdef CONFIG_MMU_NOTIFIER
 	obj = i915_gem_object_alloc();
 	if (obj == NULL)
 		return -ENOMEM;
@@ -845,7 +816,7 @@  i915_gem_userptr_ioctl(struct drm_device *dev,
 	 */
 	ret = i915_gem_userptr_init__mm_struct(obj);
 	if (ret == 0)
-		ret = i915_gem_userptr_init__mmu_notifier(obj, args->flags);
+		ret = i915_gem_userptr_init__mmu_notifier(obj);
 	if (ret == 0)
 		ret = drm_gem_handle_create(file, &obj->base, &handle);
 
@@ -856,10 +827,14 @@  i915_gem_userptr_ioctl(struct drm_device *dev,
 
 	args->handle = handle;
 	return 0;
+#else
+	return -ENODEV;
+#endif
 }
 
 int i915_gem_init_userptr(struct drm_i915_private *dev_priv)
 {
+#ifdef CONFIG_MMU_NOTIFIER
 	spin_lock_init(&dev_priv->mm_lock);
 	hash_init(dev_priv->mm_structs);
 
@@ -869,11 +844,14 @@  int i915_gem_init_userptr(struct drm_i915_private *dev_priv)
 				0);
 	if (!dev_priv->mm.userptr_wq)
 		return -ENOMEM;
+#endif
 
 	return 0;
 }
 
 void i915_gem_cleanup_userptr(struct drm_i915_private *dev_priv)
 {
+#ifdef CONFIG_MMU_NOTIFIER
 	destroy_workqueue(dev_priv->mm.userptr_wq);
+#endif
 }
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 126114484cb6..77d47c18572d 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -589,12 +589,14 @@  struct i915_gem_mm {
 	struct notifier_block vmap_notifier;
 	struct shrinker shrinker;
 
+#ifdef CONFIG_MMU_NOTIFIER
 	/**
 	 * Workqueue to fault in userptr pages, flushed by the execbuf
 	 * when required but otherwise left to userspace to try again
 	 * on EAGAIN.
 	 */
 	struct workqueue_struct *userptr_wq;
+#endif
 
 	/* shrinker accounting, also useful for userland debugging */
 	u64 shrink_memory;