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Subject[PATCH v2 6/7] binder: remove user_buffer_offset
Date
Remove user_buffer_offset since there is no kernel
buffer pointer anymore.

Signed-off-by: Todd Kjos <tkjos@google.com>
---
v2: removed casts as suggested by Dan Carpenter

drivers/android/binder.c | 39 ++++++----------------------------
drivers/android/binder_alloc.c | 16 ++++++--------
drivers/android/binder_alloc.h | 23 --------------------
3 files changed, 13 insertions(+), 65 deletions(-)

diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index 98163bf5f35c..b3d609b5935a 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -2380,7 +2380,6 @@ static void binder_transaction_buffer_release(struct binder_proc *proc,
struct binder_fd_array_object *fda;
struct binder_buffer_object *parent;
struct binder_object ptr_object;
- uintptr_t parent_buffer;
u32 *fd_array;
size_t fd_index;
binder_size_t fd_buf_size;
@@ -2405,14 +2404,6 @@ static void binder_transaction_buffer_release(struct binder_proc *proc,
debug_id);
continue;
}
- /*
- * Since the parent was already fixed up, convert it
- * back to kernel address space to access it
- */
- parent_buffer = parent->buffer -
- binder_alloc_get_user_buffer_offset(
- &proc->alloc);
-
fd_buf_size = sizeof(u32) * fda->num_fds;
if (fda->num_fds >= SIZE_MAX / sizeof(u32)) {
pr_err("transaction release %d invalid number of fds (%lld)\n",
@@ -2426,7 +2417,8 @@ static void binder_transaction_buffer_release(struct binder_proc *proc,
debug_id, (u64)fda->num_fds);
continue;
}
- fd_array = (u32 *)(parent_buffer + (uintptr_t)fda->parent_offset);
+ fd_array = (u32 *)(uintptr_t)
+ (parent->buffer + fda->parent_offset);
for (fd_index = 0; fd_index < fda->num_fds;
fd_index++) {
u32 fd;
@@ -2646,7 +2638,6 @@ static int binder_translate_fd_array(struct binder_fd_array_object *fda,
struct binder_transaction *in_reply_to)
{
binder_size_t fdi, fd_buf_size;
- uintptr_t parent_buffer;
u32 *fd_array;
struct binder_proc *proc = thread->proc;
struct binder_proc *target_proc = t->to_proc;
@@ -2664,13 +2655,7 @@ static int binder_translate_fd_array(struct binder_fd_array_object *fda,
proc->pid, thread->pid, (u64)fda->num_fds);
return -EINVAL;
}
- /*
- * Since the parent was already fixed up, convert it
- * back to the kernel address space to access it
- */
- parent_buffer = parent->buffer -
- binder_alloc_get_user_buffer_offset(&target_proc->alloc);
- fd_array = (u32 *)(parent_buffer + (uintptr_t)fda->parent_offset);
+ fd_array = (u32 *)(uintptr_t)(parent->buffer + fda->parent_offset);
if (!IS_ALIGNED((unsigned long)fd_array, sizeof(u32))) {
binder_user_error("%d:%d parent offset not aligned correctly.\n",
proc->pid, thread->pid);
@@ -2703,7 +2688,6 @@ static int binder_fixup_parent(struct binder_transaction *t,
binder_size_t last_fixup_min_off)
{
struct binder_buffer_object *parent;
- u8 *parent_buffer;
struct binder_buffer *b = t->buffer;
struct binder_proc *proc = thread->proc;
struct binder_proc *target_proc = t->to_proc;
@@ -2739,11 +2723,8 @@ static int binder_fixup_parent(struct binder_transaction *t,
proc->pid, thread->pid);
return -EINVAL;
}
- parent_buffer = (u8 *)((uintptr_t)parent->buffer -
- binder_alloc_get_user_buffer_offset(
- &target_proc->alloc));
buffer_offset = bp->parent_offset +
- (uintptr_t)parent_buffer - (uintptr_t)b->data;
+ (uintptr_t)parent->buffer - (uintptr_t)b->data;
binder_alloc_copy_to_buffer(&target_proc->alloc, b, buffer_offset,
&bp->buffer, sizeof(bp->buffer));

@@ -3159,10 +3140,8 @@ static void binder_transaction(struct binder_proc *proc,
ALIGN(tr->offsets_size, sizeof(void *)) +
ALIGN(extra_buffers_size, sizeof(void *)) -
ALIGN(secctx_sz, sizeof(u64));
- char *kptr = t->buffer->data + buf_offset;

- t->security_ctx = (uintptr_t)kptr +
- binder_alloc_get_user_buffer_offset(&target_proc->alloc);
+ t->security_ctx = (uintptr_t)t->buffer->data + buf_offset;
binder_alloc_copy_to_buffer(&target_proc->alloc,
t->buffer, buf_offset,
secctx, secctx_sz);
@@ -3380,9 +3359,7 @@ static void binder_transaction(struct binder_proc *proc,
goto err_copy_data_failed;
}
/* Fixup buffer pointer to target proc address space */
- bp->buffer = (uintptr_t)sg_bufp +
- binder_alloc_get_user_buffer_offset(
- &target_proc->alloc);
+ bp->buffer = (uintptr_t)sg_bufp;
sg_bufp += ALIGN(bp->length, sizeof(u64));

ret = binder_fixup_parent(t, thread, bp,
@@ -4474,9 +4451,7 @@ static int binder_thread_read(struct binder_proc *proc,
}
trd->data_size = t->buffer->data_size;
trd->offsets_size = t->buffer->offsets_size;
- trd->data.ptr.buffer = (binder_uintptr_t)
- ((uintptr_t)t->buffer->data +
- binder_alloc_get_user_buffer_offset(&proc->alloc));
+ trd->data.ptr.buffer = (uintptr_t)t->buffer->data;
trd->data.ptr.offsets = trd->data.ptr.buffer +
ALIGN(t->buffer->data_size,
sizeof(void *));
diff --git a/drivers/android/binder_alloc.c b/drivers/android/binder_alloc.c
index d4cbe4b3947a..0e7f0aa967c3 100644
--- a/drivers/android/binder_alloc.c
+++ b/drivers/android/binder_alloc.c
@@ -138,17 +138,17 @@ static struct binder_buffer *binder_alloc_prepare_to_free_locked(
{
struct rb_node *n = alloc->allocated_buffers.rb_node;
struct binder_buffer *buffer;
- void *kern_ptr;
+ void *uptr;

- kern_ptr = (void *)(user_ptr - alloc->user_buffer_offset);
+ uptr = (void *)user_ptr;

while (n) {
buffer = rb_entry(n, struct binder_buffer, rb_node);
BUG_ON(buffer->free);

- if (kern_ptr < buffer->data)
+ if (uptr < buffer->data)
n = n->rb_left;
- else if (kern_ptr > buffer->data)
+ else if (uptr > buffer->data)
n = n->rb_right;
else {
/*
@@ -265,8 +265,7 @@ static int binder_update_page_range(struct binder_alloc *alloc, int allocate,
page->alloc = alloc;
INIT_LIST_HEAD(&page->lru);

- user_page_addr =
- (uintptr_t)page_addr + alloc->user_buffer_offset;
+ user_page_addr = (uintptr_t)page_addr;
ret = vm_insert_page(vma, user_page_addr, page[0].page_ptr);
if (ret) {
pr_err("%d: binder_alloc_buf failed to map page at %lx in userspace\n",
@@ -694,7 +693,6 @@ int binder_alloc_mmap_handler(struct binder_alloc *alloc,
}

alloc->buffer = (void *)vma->vm_start;
- alloc->user_buffer_offset = 0;
mutex_unlock(&binder_alloc_mmap_lock);

alloc->pages = kcalloc((vma->vm_end - vma->vm_start) / PAGE_SIZE,
@@ -941,9 +939,7 @@ enum lru_status binder_alloc_free_page(struct list_head *item,
if (vma) {
trace_binder_unmap_user_start(alloc, index);

- zap_page_range(vma,
- page_addr + alloc->user_buffer_offset,
- PAGE_SIZE);
+ zap_page_range(vma, page_addr, PAGE_SIZE);

trace_binder_unmap_user_end(alloc, index);

diff --git a/drivers/android/binder_alloc.h b/drivers/android/binder_alloc.h
index 9d682b9d6c24..1026e9fb20db 100644
--- a/drivers/android/binder_alloc.h
+++ b/drivers/android/binder_alloc.h
@@ -82,7 +82,6 @@ struct binder_lru_page {
* (invariant after init)
* @vma_vm_mm: copy of vma->vm_mm (invarient after mmap)
* @buffer: base of per-proc address space mapped via mmap
- * @user_buffer_offset: offset between user and kernel VAs for buffer
* @buffers: list of all buffers for this proc
* @free_buffers: rb tree of buffers available for allocation
* sorted by size
@@ -104,7 +103,6 @@ struct binder_alloc {
struct vm_area_struct *vma;
struct mm_struct *vma_vm_mm;
void *buffer;
- ptrdiff_t user_buffer_offset;
struct list_head buffers;
struct rb_root free_buffers;
struct rb_root allocated_buffers;
@@ -163,27 +161,6 @@ binder_alloc_get_free_async_space(struct binder_alloc *alloc)
return free_async_space;
}

-/**
- * binder_alloc_get_user_buffer_offset() - get offset between kernel/user addrs
- * @alloc: binder_alloc for this proc
- *
- * Return: the offset between kernel and user-space addresses to use for
- * virtual address conversion
- */
-static inline ptrdiff_t
-binder_alloc_get_user_buffer_offset(struct binder_alloc *alloc)
-{
- /*
- * user_buffer_offset is constant if vma is set and
- * undefined if vma is not set. It is possible to
- * get here with !alloc->vma if the target process
- * is dying while a transaction is being initiated.
- * Returning the old value is ok in this case and
- * the transaction will fail.
- */
- return alloc->user_buffer_offset;
-}
-
unsigned long
binder_alloc_copy_user_to_buffer(struct binder_alloc *alloc,
struct binder_buffer *buffer,
--
2.20.1.495.gaa96b0ce6b-goog
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