[PATCH 14/57] drm/i915: Reject UNSYNCHRONIZED for userptr

Maarten Lankhorst maarten.lankhorst at linux.intel.com
Wed Sep 23 13:49:18 UTC 2020


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 at linux.intel.com>
---
 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   | 58 ++++++-------------
 drivers/gpu/drm/i915/i915_drv.h               |  2 +
 4 files changed, 26 insertions(+), 40 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.h b/drivers/gpu/drm/i915/gem/i915_gem_object.h
index e79f7b2a36e6..61a480a282e9 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object.h
@@ -517,7 +517,11 @@ 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 dbb6f6171165..970d20b30ebd 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
@@ -286,6 +286,7 @@ struct drm_i915_gem_object {
 	unsigned long *bit_17;
 
 	union {
+#ifdef CONFIG_MMU_NOTIFIER
 		struct i915_gem_userptr {
 			uintptr_t ptr;
 
@@ -293,6 +294,7 @@ 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..08a5f36a6c0d 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.
@@ -774,7 +741,7 @@ i915_gem_userptr_ioctl(struct drm_device *dev,
 	static struct lock_class_key lock_class;
 	struct drm_i915_private *dev_priv = to_i915(dev);
 	struct drm_i915_gem_userptr *args = data;
-	struct drm_i915_gem_object *obj;
+	struct drm_i915_gem_object __maybe_unused *obj;
 	int ret;
 	u32 handle;
 
@@ -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 00d21a595498..d9935040040b 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;
-- 
2.28.0



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