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-rw-r--r--drivers/android/binder_alloc.c144
-rw-r--r--drivers/android/binder_alloc.h2
-rw-r--r--drivers/android/binder_alloc_selftest.c11
3 files changed, 90 insertions, 67 deletions
diff --git a/drivers/android/binder_alloc.c b/drivers/android/binder_alloc.c
index f15af2b55a62..e96659215f25 100644
--- a/drivers/android/binder_alloc.c
+++ b/drivers/android/binder_alloc.c
@@ -62,9 +62,9 @@ static size_t binder_alloc_buffer_size(struct binder_alloc *alloc,
struct binder_buffer *buffer)
{
if (list_is_last(&buffer->entry, &alloc->buffers))
- return alloc->buffer +
- alloc->buffer_size - (void *)buffer->data;
- return (size_t)binder_buffer_next(buffer) - (size_t)buffer->data;
+ return (u8 *)alloc->buffer +
+ alloc->buffer_size - (u8 *)buffer->data;
+ return (u8 *)binder_buffer_next(buffer)->data - (u8 *)buffer->data;
}
static void binder_insert_free_buffer(struct binder_alloc *alloc,
@@ -114,9 +114,9 @@ static void binder_insert_allocated_buffer_locked(
buffer = rb_entry(parent, struct binder_buffer, rb_node);
BUG_ON(buffer->free);
- if (new_buffer < buffer)
+ if (new_buffer->data < buffer->data)
p = &parent->rb_left;
- else if (new_buffer > buffer)
+ else if (new_buffer->data > buffer->data)
p = &parent->rb_right;
else
BUG();
@@ -131,18 +131,17 @@ static struct binder_buffer *binder_alloc_prepare_to_free_locked(
{
struct rb_node *n = alloc->allocated_buffers.rb_node;
struct binder_buffer *buffer;
- struct binder_buffer *kern_ptr;
+ void *kern_ptr;
- kern_ptr = (struct binder_buffer *)(user_ptr - alloc->user_buffer_offset
- - offsetof(struct binder_buffer, data));
+ kern_ptr = (void *)(user_ptr - alloc->user_buffer_offset);
while (n) {
buffer = rb_entry(n, struct binder_buffer, rb_node);
BUG_ON(buffer->free);
- if (kern_ptr < buffer)
+ if (kern_ptr < buffer->data)
n = n->rb_left;
- else if (kern_ptr > buffer)
+ else if (kern_ptr > buffer->data)
n = n->rb_right;
else {
/*
@@ -330,6 +329,9 @@ struct binder_buffer *binder_alloc_new_buf_locked(struct binder_alloc *alloc,
return ERR_PTR(-ENOSPC);
}
+ /* Pad 0-size buffers so they get assigned unique addresses */
+ size = max(size, sizeof(void *));
+
while (n) {
buffer = rb_entry(n, struct binder_buffer, rb_node);
BUG_ON(!buffer->free);
@@ -389,14 +391,9 @@ struct binder_buffer *binder_alloc_new_buf_locked(struct binder_alloc *alloc,
has_page_addr =
(void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK);
- if (n == NULL) {
- if (size + sizeof(struct binder_buffer) + 4 >= buffer_size)
- buffer_size = size; /* no room for other buffers */
- else
- buffer_size = size + sizeof(struct binder_buffer);
- }
+ WARN_ON(n && buffer_size != size);
end_page_addr =
- (void *)PAGE_ALIGN((uintptr_t)buffer->data + buffer_size);
+ (void *)PAGE_ALIGN((uintptr_t)buffer->data + size);
if (end_page_addr > has_page_addr)
end_page_addr = has_page_addr;
ret = binder_update_page_range(alloc, 1,
@@ -404,17 +401,25 @@ struct binder_buffer *binder_alloc_new_buf_locked(struct binder_alloc *alloc,
if (ret)
return ERR_PTR(ret);
- rb_erase(best_fit, &alloc->free_buffers);
- buffer->free = 0;
- buffer->free_in_progress = 0;
- binder_insert_allocated_buffer_locked(alloc, buffer);
if (buffer_size != size) {
- struct binder_buffer *new_buffer = (void *)buffer->data + size;
+ struct binder_buffer *new_buffer;
+ new_buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
+ if (!new_buffer) {
+ pr_err("%s: %d failed to alloc new buffer struct\n",
+ __func__, alloc->pid);
+ goto err_alloc_buf_struct_failed;
+ }
+ new_buffer->data = (u8 *)buffer->data + size;
list_add(&new_buffer->entry, &buffer->entry);
new_buffer->free = 1;
binder_insert_free_buffer(alloc, new_buffer);
}
+
+ rb_erase(best_fit, &alloc->free_buffers);
+ buffer->free = 0;
+ buffer->free_in_progress = 0;
+ binder_insert_allocated_buffer_locked(alloc, buffer);
binder_alloc_debug(BINDER_DEBUG_BUFFER_ALLOC,
"%d: binder_alloc_buf size %zd got %pK\n",
alloc->pid, size, buffer);
@@ -429,6 +434,12 @@ struct binder_buffer *binder_alloc_new_buf_locked(struct binder_alloc *alloc,
alloc->pid, size, alloc->free_async_space);
}
return buffer;
+
+err_alloc_buf_struct_failed:
+ binder_update_page_range(alloc, 0,
+ (void *)PAGE_ALIGN((uintptr_t)buffer->data),
+ end_page_addr, NULL);
+ return ERR_PTR(-ENOMEM);
}
/**
@@ -463,56 +474,59 @@ struct binder_buffer *binder_alloc_new_buf(struct binder_alloc *alloc,
static void *buffer_start_page(struct binder_buffer *buffer)
{
- return (void *)((uintptr_t)buffer & PAGE_MASK);
+ return (void *)((uintptr_t)buffer->data & PAGE_MASK);
}
-static void *buffer_end_page(struct binder_buffer *buffer)
+static void *prev_buffer_end_page(struct binder_buffer *buffer)
{
- return (void *)(((uintptr_t)(buffer + 1) - 1) & PAGE_MASK);
+ return (void *)(((uintptr_t)(buffer->data) - 1) & PAGE_MASK);
}
static void binder_delete_free_buffer(struct binder_alloc *alloc,
struct binder_buffer *buffer)
{
struct binder_buffer *prev, *next = NULL;
- int free_page_end = 1;
- int free_page_start = 1;
-
+ bool to_free = true;
BUG_ON(alloc->buffers.next == &buffer->entry);
prev = binder_buffer_prev(buffer);
BUG_ON(!prev->free);
- if (buffer_end_page(prev) == buffer_start_page(buffer)) {
- free_page_start = 0;
- if (buffer_end_page(prev) == buffer_end_page(buffer))
- free_page_end = 0;
+ if (prev_buffer_end_page(prev) == buffer_start_page(buffer)) {
+ to_free = false;
binder_alloc_debug(BINDER_DEBUG_BUFFER_ALLOC,
- "%d: merge free, buffer %pK share page with %pK\n",
- alloc->pid, buffer, prev);
+ "%d: merge free, buffer %pK share page with %pK\n",
+ alloc->pid, buffer->data, prev->data);
}
if (!list_is_last(&buffer->entry, &alloc->buffers)) {
next = binder_buffer_next(buffer);
- if (buffer_start_page(next) == buffer_end_page(buffer)) {
- free_page_end = 0;
- if (buffer_start_page(next) ==
- buffer_start_page(buffer))
- free_page_start = 0;
+ if (buffer_start_page(next) == buffer_start_page(buffer)) {
+ to_free = false;
binder_alloc_debug(BINDER_DEBUG_BUFFER_ALLOC,
- "%d: merge free, buffer %pK share page with %pK\n",
- alloc->pid, buffer, prev);
+ "%d: merge free, buffer %pK share page with %pK\n",
+ alloc->pid,
+ buffer->data,
+ next->data);
}
}
- list_del(&buffer->entry);
- if (free_page_start || free_page_end) {
+
+ if (PAGE_ALIGNED(buffer->data)) {
+ binder_alloc_debug(BINDER_DEBUG_BUFFER_ALLOC,
+ "%d: merge free, buffer start %pK is page aligned\n",
+ alloc->pid, buffer->data);
+ to_free = false;
+ }
+
+ if (to_free) {
binder_alloc_debug(BINDER_DEBUG_BUFFER_ALLOC,
- "%d: merge free, buffer %pK do not share page%s%s with %pK or %pK\n",
- alloc->pid, buffer, free_page_start ? "" : " end",
- free_page_end ? "" : " start", prev, next);
- binder_update_page_range(alloc, 0, free_page_start ?
- buffer_start_page(buffer) : buffer_end_page(buffer),
- (free_page_end ? buffer_end_page(buffer) :
- buffer_start_page(buffer)) + PAGE_SIZE, NULL);
+ "%d: merge free, buffer %pK do not share page with %pK or %pK\n",
+ alloc->pid, buffer->data,
+ prev->data, next->data);
+ binder_update_page_range(alloc, 0, buffer_start_page(buffer),
+ buffer_start_page(buffer) + PAGE_SIZE,
+ NULL);
}
+ list_del(&buffer->entry);
+ kfree(buffer);
}
static void binder_free_buf_locked(struct binder_alloc *alloc,
@@ -533,8 +547,8 @@ static void binder_free_buf_locked(struct binder_alloc *alloc,
BUG_ON(buffer->free);
BUG_ON(size > buffer_size);
BUG_ON(buffer->transaction != NULL);
- BUG_ON((void *)buffer < alloc->buffer);
- BUG_ON((void *)buffer > alloc->buffer + alloc->buffer_size);
+ BUG_ON(buffer->data < alloc->buffer);
+ BUG_ON(buffer->data > alloc->buffer + alloc->buffer_size);
if (buffer->async_transaction) {
alloc->free_async_space += size + sizeof(struct binder_buffer);
@@ -646,13 +660,14 @@ int binder_alloc_mmap_handler(struct binder_alloc *alloc,
}
alloc->buffer_size = vma->vm_end - vma->vm_start;
- if (binder_update_page_range(alloc, 1, alloc->buffer,
- alloc->buffer + PAGE_SIZE, vma)) {
+ buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
+ if (!buffer) {
ret = -ENOMEM;
- failure_string = "alloc small buf";
- goto err_alloc_small_buf_failed;
+ failure_string = "alloc buffer struct";
+ goto err_alloc_buf_struct_failed;
}
- buffer = alloc->buffer;
+
+ buffer->data = alloc->buffer;
INIT_LIST_HEAD(&alloc->buffers);
list_add(&buffer->entry, &alloc->buffers);
buffer->free = 1;
@@ -664,7 +679,7 @@ int binder_alloc_mmap_handler(struct binder_alloc *alloc,
return 0;
-err_alloc_small_buf_failed:
+err_alloc_buf_struct_failed:
kfree(alloc->pages);
alloc->pages = NULL;
err_alloc_pages_failed:
@@ -684,14 +699,13 @@ void binder_alloc_deferred_release(struct binder_alloc *alloc)
{
struct rb_node *n;
int buffers, page_count;
+ struct binder_buffer *buffer;
BUG_ON(alloc->vma);
buffers = 0;
mutex_lock(&alloc->mutex);
while ((n = rb_first(&alloc->allocated_buffers))) {
- struct binder_buffer *buffer;
-
buffer = rb_entry(n, struct binder_buffer, rb_node);
/* Transaction should already have been freed */
@@ -701,6 +715,16 @@ void binder_alloc_deferred_release(struct binder_alloc *alloc)
buffers++;
}
+ while (!list_empty(&alloc->buffers)) {
+ buffer = list_first_entry(&alloc->buffers,
+ struct binder_buffer, entry);
+ WARN_ON(!buffer->free);
+
+ list_del(&buffer->entry);
+ WARN_ON_ONCE(!list_empty(&alloc->buffers));
+ kfree(buffer);
+ }
+
page_count = 0;
if (alloc->pages) {
int i;
diff --git a/drivers/android/binder_alloc.h b/drivers/android/binder_alloc.h
index 4f02cc084c15..dd5649bf6469 100644
--- a/drivers/android/binder_alloc.h
+++ b/drivers/android/binder_alloc.h
@@ -57,7 +57,7 @@ struct binder_buffer {
size_t data_size;
size_t offsets_size;
size_t extra_buffers_size;
- uint8_t data[0];
+ void *data;
};
/**
diff --git a/drivers/android/binder_alloc_selftest.c b/drivers/android/binder_alloc_selftest.c
index cc00ab6ee29d..0bf72079a9da 100644
--- a/drivers/android/binder_alloc_selftest.c
+++ b/drivers/android/binder_alloc_selftest.c
@@ -105,8 +105,9 @@ static bool check_buffer_pages_allocated(struct binder_alloc *alloc,
void *page_addr, *end;
int page_index;
- end = (void *)PAGE_ALIGN((uintptr_t)buffer + size);
- for (page_addr = buffer; page_addr < end; page_addr += PAGE_SIZE) {
+ end = (void *)PAGE_ALIGN((uintptr_t)buffer->data + size);
+ page_addr = buffer->data;
+ for (; page_addr < end; page_addr += PAGE_SIZE) {
page_index = (page_addr - alloc->buffer) / PAGE_SIZE;
if (!alloc->pages[page_index]) {
pr_err("incorrect alloc state at page index %d\n",
@@ -209,8 +210,7 @@ static void binder_selftest_alloc_size(struct binder_alloc *alloc,
* Only BUFFER_NUM - 1 buffer sizes are adjustable since
* we need one giant buffer before getting to the last page.
*/
- back_sizes[0] += alloc->buffer_size - end_offset[BUFFER_NUM - 1]
- - sizeof(struct binder_buffer) * BUFFER_NUM;
+ back_sizes[0] += alloc->buffer_size - end_offset[BUFFER_NUM - 1];
binder_selftest_free_seq(alloc, front_sizes, seq, 0);
binder_selftest_free_seq(alloc, back_sizes, seq, 0);
}
@@ -228,8 +228,7 @@ static void binder_selftest_alloc_offset(struct binder_alloc *alloc,
prev = index == 0 ? 0 : end_offset[index - 1];
end = prev;
- BUILD_BUG_ON((BUFFER_MIN_SIZE + sizeof(struct binder_buffer))
- * BUFFER_NUM >= PAGE_SIZE);
+ BUILD_BUG_ON(BUFFER_MIN_SIZE * BUFFER_NUM >= PAGE_SIZE);
for (align = SAME_PAGE_UNALIGNED; align < LOOP_END; align++) {
if (align % 2)

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