[PATCH v13 1/2] kernel.h: add u64_to_user_ptr()

From: Gustavo Padovan
Date: Tue Apr 26 2016 - 11:32:48 EST

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From: Gustavo Padovan <gustavo.padovan@xxxxxxxxxxxxxxx>

This function had copies in 3 different files. Unify them in kernel.h.

Cc: Joe Perches <joe@xxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: David Airlie <airlied@xxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxxx>
Cc: Rob Clark <robdclark@xxxxxxxxx>
Signed-off-by: Gustavo Padovan <gustavo.padovan@xxxxxxxxxxxxxxx>
Acked-by: Daniel Vetter <daniel.vetter@xxxxxxxxx> [drm/i915/]
Acked-by: Rob Clark <robdclark@xxxxxxxxx> [drm/msm/]
Acked-by: Lucas Stach <l.stach@xxxxxxxxxxxxxx> [drm/etinav/]
Acked-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>

---
v2: add typecheck() (comment from Maarten Lankhorst)

v3: make u64_to_user_ptr() a macro (comment from Joe Perches)

v4: collect all Acked-bys
---
drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c | 11 +++--------
drivers/gpu/drm/i915/i915_drv.h | 5 -----
drivers/gpu/drm/i915/i915_gem.c | 14 +++++++-------
drivers/gpu/drm/i915/i915_gem_execbuffer.c | 14 +++++++-------
drivers/gpu/drm/msm/msm_gem_submit.c | 11 +++--------
include/linux/kernel.h | 7 +++++++
6 files changed, 27 insertions(+), 35 deletions(-)

diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c b/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
index 236ada9..afdd55d 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
@@ -28,11 +28,6 @@
#define BO_LOCKED 0x4000
#define BO_PINNED 0x2000

-static inline void __user *to_user_ptr(u64 address)
-{
- return (void __user *)(uintptr_t)address;
-}
-
static struct etnaviv_gem_submit *submit_create(struct drm_device *dev,
struct etnaviv_gpu *gpu, size_t nr)
{
@@ -347,21 +342,21 @@ int etnaviv_ioctl_gem_submit(struct drm_device *dev, void *data,
cmdbuf->exec_state = args->exec_state;
cmdbuf->ctx = file->driver_priv;

- ret = copy_from_user(bos, to_user_ptr(args->bos),
+ ret = copy_from_user(bos, u64_to_user_ptr(args->bos),
args->nr_bos * sizeof(*bos));
if (ret) {
ret = -EFAULT;
goto err_submit_cmds;
}

- ret = copy_from_user(relocs, to_user_ptr(args->relocs),
+ ret = copy_from_user(relocs, u64_to_user_ptr(args->relocs),
args->nr_relocs * sizeof(*relocs));
if (ret) {
ret = -EFAULT;
goto err_submit_cmds;
}

- ret = copy_from_user(stream, to_user_ptr(args->stream),
+ ret = copy_from_user(stream, u64_to_user_ptr(args->stream),
args->stream_size);
if (ret) {
ret = -EFAULT;
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 1048093..bb624cc 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -3576,11 +3576,6 @@ static inline i915_reg_t i915_vgacntrl_reg(struct drm_device *dev)
return VGACNTRL;
}

-static inline void __user *to_user_ptr(u64 address)
-{
- return (void __user *)(uintptr_t)address;
-}
-
static inline unsigned long msecs_to_jiffies_timeout(const unsigned int m)
{
unsigned long j = msecs_to_jiffies(m);
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index dabc089..2889716 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -324,7 +324,7 @@ i915_gem_phys_pwrite(struct drm_i915_gem_object *obj,
{
struct drm_device *dev = obj->base.dev;
void *vaddr = obj->phys_handle->vaddr + args->offset;
- char __user *user_data = to_user_ptr(args->data_ptr);
+ char __user *user_data = u64_to_user_ptr(args->data_ptr);
int ret = 0;

/* We manually control the domain here and pretend that it
@@ -605,7 +605,7 @@ i915_gem_shmem_pread(struct drm_device *dev,
int needs_clflush = 0;
struct sg_page_iter sg_iter;

- user_data = to_user_ptr(args->data_ptr);
+ user_data = u64_to_user_ptr(args->data_ptr);
remain = args->size;

obj_do_bit17_swizzling = i915_gem_object_needs_bit17_swizzle(obj);
@@ -692,7 +692,7 @@ i915_gem_pread_ioctl(struct drm_device *dev, void *data,
return 0;

if (!access_ok(VERIFY_WRITE,
- to_user_ptr(args->data_ptr),
+ u64_to_user_ptr(args->data_ptr),
args->size))
return -EFAULT;

@@ -783,7 +783,7 @@ i915_gem_gtt_pwrite_fast(struct drm_device *dev,
if (ret)
goto out_unpin;

- user_data = to_user_ptr(args->data_ptr);
+ user_data = u64_to_user_ptr(args->data_ptr);
remain = args->size;

offset = i915_gem_obj_ggtt_offset(obj) + args->offset;
@@ -907,7 +907,7 @@ i915_gem_shmem_pwrite(struct drm_device *dev,
int needs_clflush_before = 0;
struct sg_page_iter sg_iter;

- user_data = to_user_ptr(args->data_ptr);
+ user_data = u64_to_user_ptr(args->data_ptr);
remain = args->size;

obj_do_bit17_swizzling = i915_gem_object_needs_bit17_swizzle(obj);
@@ -1036,12 +1036,12 @@ i915_gem_pwrite_ioctl(struct drm_device *dev, void *data,
return 0;

if (!access_ok(VERIFY_READ,
- to_user_ptr(args->data_ptr),
+ u64_to_user_ptr(args->data_ptr),
args->size))
return -EFAULT;

if (likely(!i915.prefault_disable)) {
- ret = fault_in_multipages_readable(to_user_ptr(args->data_ptr),
+ ret = fault_in_multipages_readable(u64_to_user_ptr(args->data_ptr),
args->size);
if (ret)
return -EFAULT;
diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index 1328bc5..e60b4e7 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -514,7 +514,7 @@ i915_gem_execbuffer_relocate_vma(struct i915_vma *vma,
struct drm_i915_gem_exec_object2 *entry = vma->exec_entry;
int remain, ret;

- user_relocs = to_user_ptr(entry->relocs_ptr);
+ user_relocs = u64_to_user_ptr(entry->relocs_ptr);

remain = entry->relocation_count;
while (remain) {
@@ -865,7 +865,7 @@ i915_gem_execbuffer_relocate_slow(struct drm_device *dev,
u64 invalid_offset = (u64)-1;
int j;

- user_relocs = to_user_ptr(exec[i].relocs_ptr);
+ user_relocs = u64_to_user_ptr(exec[i].relocs_ptr);

if (copy_from_user(reloc+total, user_relocs,
exec[i].relocation_count * sizeof(*reloc))) {
@@ -1009,7 +1009,7 @@ validate_exec_list(struct drm_device *dev,
invalid_flags |= EXEC_OBJECT_NEEDS_GTT;

for (i = 0; i < count; i++) {
- char __user *ptr = to_user_ptr(exec[i].relocs_ptr);
+ char __user *ptr = u64_to_user_ptr(exec[i].relocs_ptr);
int length; /* limited by fault_in_pages_readable() */

if (exec[i].flags & invalid_flags)
@@ -1696,7 +1696,7 @@ i915_gem_execbuffer(struct drm_device *dev, void *data,
return -ENOMEM;
}
ret = copy_from_user(exec_list,
- to_user_ptr(args->buffers_ptr),
+ u64_to_user_ptr(args->buffers_ptr),
sizeof(*exec_list) * args->buffer_count);
if (ret != 0) {
DRM_DEBUG("copy %d exec entries failed %d\n",
@@ -1732,7 +1732,7 @@ i915_gem_execbuffer(struct drm_device *dev, void *data,
ret = i915_gem_do_execbuffer(dev, data, file, &exec2, exec2_list);
if (!ret) {
struct drm_i915_gem_exec_object __user *user_exec_list =
- to_user_ptr(args->buffers_ptr);
+ u64_to_user_ptr(args->buffers_ptr);

/* Copy the new buffer offsets back to the user's exec list. */
for (i = 0; i < args->buffer_count; i++) {
@@ -1786,7 +1786,7 @@ i915_gem_execbuffer2(struct drm_device *dev, void *data,
return -ENOMEM;
}
ret = copy_from_user(exec2_list,
- to_user_ptr(args->buffers_ptr),
+ u64_to_user_ptr(args->buffers_ptr),
sizeof(*exec2_list) * args->buffer_count);
if (ret != 0) {
DRM_DEBUG("copy %d exec entries failed %d\n",
@@ -1799,7 +1799,7 @@ i915_gem_execbuffer2(struct drm_device *dev, void *data,
if (!ret) {
/* Copy the new buffer offsets back to the user's exec list. */
struct drm_i915_gem_exec_object2 __user *user_exec_list =
- to_user_ptr(args->buffers_ptr);
+ u64_to_user_ptr(args->buffers_ptr);
int i;

for (i = 0; i < args->buffer_count; i++) {
diff --git a/drivers/gpu/drm/msm/msm_gem_submit.c b/drivers/gpu/drm/msm/msm_gem_submit.c
index 43d2181..23d2528 100644
--- a/drivers/gpu/drm/msm/msm_gem_submit.c
+++ b/drivers/gpu/drm/msm/msm_gem_submit.c
@@ -28,11 +28,6 @@
#define BO_LOCKED 0x4000
#define BO_PINNED 0x2000

-static inline void __user *to_user_ptr(u64 address)
-{
- return (void __user *)(uintptr_t)address;
-}
-
static struct msm_gem_submit *submit_create(struct drm_device *dev,
struct msm_gpu *gpu, int nr)
{
@@ -68,7 +63,7 @@ static int submit_lookup_objects(struct msm_gem_submit *submit,
struct drm_gem_object *obj;
struct msm_gem_object *msm_obj;
void __user *userptr =
- to_user_ptr(args->bos + (i * sizeof(submit_bo)));
+ u64_to_user_ptr(args->bos + (i * sizeof(submit_bo)));

ret = copy_from_user(&submit_bo, userptr, sizeof(submit_bo));
if (ret) {
@@ -257,7 +252,7 @@ static int submit_reloc(struct msm_gem_submit *submit, struct msm_gem_object *ob
for (i = 0; i < nr_relocs; i++) {
struct drm_msm_gem_submit_reloc submit_reloc;
void __user *userptr =
- to_user_ptr(relocs + (i * sizeof(submit_reloc)));
+ u64_to_user_ptr(relocs + (i * sizeof(submit_reloc)));
uint32_t iova, off;
bool valid;

@@ -356,7 +351,7 @@ int msm_ioctl_gem_submit(struct drm_device *dev, void *data,
for (i = 0; i < args->nr_cmds; i++) {
struct drm_msm_gem_submit_cmd submit_cmd;
void __user *userptr =
- to_user_ptr(args->cmds + (i * sizeof(submit_cmd)));
+ u64_to_user_ptr(args->cmds + (i * sizeof(submit_cmd)));
struct msm_gem_object *msm_obj;
uint32_t iova;

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 2f7775e..f3e45cb 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -53,6 +53,13 @@

#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))

+#define u64_to_user_ptr(x) ( \
+{ \
+ typecheck(u64, x); \
+ (void __user *)(uintptr_t)x; \
+} \
+)
+
/*
* This looks more complex than it should be. But we need to
* get the type for the ~ right in round_down (it needs to be
--
2.5.5

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