[Intel-gfx] [RFC PATCH 024/162] drm/i915: Make compilation of userptr code depend on MMU_NOTIFIER.
Matthew Auld
matthew.auld at intel.com
Fri Nov 27 12:05:00 UTC 2020
From: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
Now that unsynchronized mappings are removed, the only time userptr
works is when the MMU notifier is enabled. Put all of the userptr
code behind a mmu notifier ifdef.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
Cc: Thomas Hellström <thomas.hellstrom at 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 | 58 +++++++------------
drivers/gpu/drm/i915/i915_drv.h | 2 +
5 files changed, 31 insertions(+), 37 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
index 31e412e5c68a..064285a5009b 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
@@ -1970,8 +1970,10 @@ 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 95907b8eb4c4..7b3a84f98b42 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object.h
@@ -554,7 +554,11 @@ 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 b53e44b06b09..6d3f451c15c6 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 241f865077b9..1183b28c084b 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 -ENODEV;
-
if (GEM_WARN_ON(!obj->userptr.mm))
return -EINVAL;
@@ -258,32 +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)
-{
- return -ENODEV;
-}
-
-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)
@@ -725,6 +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.
@@ -765,12 +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
@@ -809,6 +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
@@ -818,6 +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;
@@ -839,7 +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);
@@ -850,10 +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);
@@ -863,11 +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 84182a40e777..d3c67e17cd02 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;
--
2.26.2
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