50 static struct binder_buffer *binder_buffer_next(struct binder_buffer *buffer)  in binder_buffer_next()  argument
52 	return list_entry(buffer->entry.next, struct binder_buffer, entry);  in binder_buffer_next()
55 static struct binder_buffer *binder_buffer_prev(struct binder_buffer *buffer)  in binder_buffer_prev()  argument
57 	return list_entry(buffer->entry.prev, struct binder_buffer, entry);  in binder_buffer_prev()
61 				       struct binder_buffer *buffer)  in binder_alloc_buffer_size()  argument
63 	if (list_is_last(&buffer->entry, &alloc->buffers))  in binder_alloc_buffer_size()
64 		return alloc->buffer + alloc->buffer_size - buffer->user_data;  in binder_alloc_buffer_size()
65 	return binder_buffer_next(buffer)->user_data - buffer->user_data;  in binder_alloc_buffer_size()
73 	struct binder_buffer *buffer;  in binder_insert_free_buffer()  local
82 		     "%d: add free buffer, size %zd, at %pK\n",  in binder_insert_free_buffer()
87 		buffer = rb_entry(parent, struct binder_buffer, rb_node);  in binder_insert_free_buffer()
88 		BUG_ON(!buffer->free);  in binder_insert_free_buffer()
90 		buffer_size = binder_alloc_buffer_size(alloc, buffer);  in binder_insert_free_buffer()
106 	struct binder_buffer *buffer;  in binder_insert_allocated_buffer_locked()  local
112 		buffer = rb_entry(parent, struct binder_buffer, rb_node);  in binder_insert_allocated_buffer_locked()
113 		BUG_ON(buffer->free);  in binder_insert_allocated_buffer_locked()
115 		if (new_buffer->user_data < buffer->user_data)  in binder_insert_allocated_buffer_locked()
117 		else if (new_buffer->user_data > buffer->user_data)  in binder_insert_allocated_buffer_locked()
131 	struct binder_buffer *buffer;  in binder_alloc_prepare_to_free_locked()  local
134 		buffer = rb_entry(n, struct binder_buffer, rb_node);  in binder_alloc_prepare_to_free_locked()
135 		BUG_ON(buffer->free);  in binder_alloc_prepare_to_free_locked()
137 		if (user_ptr < buffer->user_data) {  in binder_alloc_prepare_to_free_locked()
139 		} else if (user_ptr > buffer->user_data) {  in binder_alloc_prepare_to_free_locked()
144 			 * free the buffer when in use by kernel or  in binder_alloc_prepare_to_free_locked()
147 			if (!buffer->allow_user_free)  in binder_alloc_prepare_to_free_locked()
149 			buffer->allow_user_free = 0;  in binder_alloc_prepare_to_free_locked()
150 			return buffer;  in binder_alloc_prepare_to_free_locked()
157  * binder_alloc_prepare_to_free() - get buffer given user ptr
159  * @user_ptr:	User pointer to buffer data
161  * Validate userspace pointer to buffer data and return buffer corresponding to
162  * that user pointer. Search the rb tree for buffer that matches user data
165  * Return:	Pointer to buffer or NULL
170 	struct binder_buffer *buffer;  in binder_alloc_prepare_to_free()  local
173 	buffer = binder_alloc_prepare_to_free_locked(alloc, user_ptr);  in binder_alloc_prepare_to_free()
175 	return buffer;  in binder_alloc_prepare_to_free()
205 		index = (page_addr - alloc->buffer) / PAGE_SIZE;  in binder_lru_freelist_add()
254 		       alloc->pid, __func__, addr - alloc->buffer, ret);  in binder_install_single_page()
269 				       struct binder_buffer *buffer,  in binder_install_buffer_pages()  argument
276 	start = buffer->user_data & PAGE_MASK;  in binder_install_buffer_pages()
277 	final = PAGE_ALIGN(buffer->user_data + size);  in binder_install_buffer_pages()
283 		index = (page_addr - alloc->buffer) / PAGE_SIZE;  in binder_install_buffer_pages()
314 		index = (page_addr - alloc->buffer) / PAGE_SIZE;  in binder_lru_freelist_del()
349 	struct binder_buffer *buffer;  in debug_no_space_locked()  local
359 		buffer = rb_entry(n, struct binder_buffer, rb_node);  in debug_no_space_locked()
360 		buffer_size = binder_alloc_buffer_size(alloc, buffer);  in debug_no_space_locked()
368 		buffer = rb_entry(n, struct binder_buffer, rb_node);  in debug_no_space_locked()
369 		buffer_size = binder_alloc_buffer_size(alloc, buffer);  in debug_no_space_locked()
392 	struct binder_buffer *buffer;  in debug_low_async_space_locked()  local
400 	 * space left (which is less than 10% of total buffer size).  in debug_low_async_space_locked()
409 		buffer = rb_entry(n, struct binder_buffer, rb_node);  in debug_low_async_space_locked()
410 		if (buffer->pid != pid)  in debug_low_async_space_locked()
412 		if (!buffer->async_transaction)  in debug_low_async_space_locked()
414 		total_alloc_size += binder_alloc_buffer_size(alloc, buffer);  in debug_low_async_space_locked()
420 	 * async space (which is 25% of total buffer size). Oneway spam is only  in debug_low_async_space_locked()
444 	struct binder_buffer *buffer;  in binder_alloc_new_buf_locked()  local
453 		buffer = ERR_PTR(-ENOSPC);  in binder_alloc_new_buf_locked()
458 		buffer = rb_entry(n, struct binder_buffer, rb_node);  in binder_alloc_new_buf_locked()
459 		BUG_ON(!buffer->free);  in binder_alloc_new_buf_locked()
460 		buffer_size = binder_alloc_buffer_size(alloc, buffer);  in binder_alloc_new_buf_locked()
478 		buffer = ERR_PTR(-ENOSPC);  in binder_alloc_new_buf_locked()
483 		/* Found an oversized buffer and needs to be split */  in binder_alloc_new_buf_locked()
484 		buffer = rb_entry(best_fit, struct binder_buffer, rb_node);  in binder_alloc_new_buf_locked()
485 		buffer_size = binder_alloc_buffer_size(alloc, buffer);  in binder_alloc_new_buf_locked()
488 		new_buffer->user_data = buffer->user_data + size;  in binder_alloc_new_buf_locked()
489 		list_add(&new_buffer->entry, &buffer->entry);  in binder_alloc_new_buf_locked()
496 		     "%d: binder_alloc_buf size %zd got buffer %pK size %zd\n",  in binder_alloc_new_buf_locked()
497 		      alloc->pid, size, buffer, buffer_size);  in binder_alloc_new_buf_locked()
502 	 * adjacent in-use buffer. In such case, the page has been already  in binder_alloc_new_buf_locked()
505 	next_used_page = (buffer->user_data + buffer_size) & PAGE_MASK;  in binder_alloc_new_buf_locked()
506 	curr_last_page = PAGE_ALIGN(buffer->user_data + size);  in binder_alloc_new_buf_locked()
507 	binder_lru_freelist_del(alloc, PAGE_ALIGN(buffer->user_data),  in binder_alloc_new_buf_locked()
510 	rb_erase(&buffer->rb_node, &alloc->free_buffers);  in binder_alloc_new_buf_locked()
511 	buffer->free = 0;  in binder_alloc_new_buf_locked()
512 	buffer->allow_user_free = 0;  in binder_alloc_new_buf_locked()
513 	binder_insert_allocated_buffer_locked(alloc, buffer);  in binder_alloc_new_buf_locked()
514 	buffer->async_transaction = is_async;  in binder_alloc_new_buf_locked()
515 	buffer->oneway_spam_suspect = false;  in binder_alloc_new_buf_locked()
522 			buffer->oneway_spam_suspect = true;  in binder_alloc_new_buf_locked()
528 	return buffer;  in binder_alloc_new_buf_locked()
554  * binder_alloc_new_buf() - Allocate a new binder buffer
556  * @data_size:          size of user data buffer
557  * @offsets_size:       user specified buffer offset
559  * @is_async:           buffer for async transaction
561  * Allocate a new buffer given the requested sizes. Returns
562  * the kernel version of the buffer pointer. The size allocated
566  * Return:	The allocated buffer or %ERR_PTR(-errno) if error
574 	struct binder_buffer *buffer, *next;  in binder_alloc_new_buf()  local
595 	/* Preallocate the next buffer */  in binder_alloc_new_buf()
601 	buffer = binder_alloc_new_buf_locked(alloc, next, size, is_async);  in binder_alloc_new_buf()
602 	if (IS_ERR(buffer)) {  in binder_alloc_new_buf()
607 	buffer->data_size = data_size;  in binder_alloc_new_buf()
608 	buffer->offsets_size = offsets_size;  in binder_alloc_new_buf()
609 	buffer->extra_buffers_size = extra_buffers_size;  in binder_alloc_new_buf()
610 	buffer->pid = current->tgid;  in binder_alloc_new_buf()
613 	ret = binder_install_buffer_pages(alloc, buffer, size);  in binder_alloc_new_buf()
615 		binder_alloc_free_buf(alloc, buffer);  in binder_alloc_new_buf()
616 		buffer = ERR_PTR(ret);  in binder_alloc_new_buf()
619 	return buffer;  in binder_alloc_new_buf()
622 static unsigned long buffer_start_page(struct binder_buffer *buffer)  in buffer_start_page()  argument
624 	return buffer->user_data & PAGE_MASK;  in buffer_start_page()
627 static unsigned long prev_buffer_end_page(struct binder_buffer *buffer)  in prev_buffer_end_page()  argument
629 	return (buffer->user_data - 1) & PAGE_MASK;  in prev_buffer_end_page()
633 				      struct binder_buffer *buffer)  in binder_delete_free_buffer()  argument
637 	if (PAGE_ALIGNED(buffer->user_data))  in binder_delete_free_buffer()
640 	BUG_ON(alloc->buffers.next == &buffer->entry);  in binder_delete_free_buffer()
641 	prev = binder_buffer_prev(buffer);  in binder_delete_free_buffer()
643 	if (prev_buffer_end_page(prev) == buffer_start_page(buffer))  in binder_delete_free_buffer()
646 	if (!list_is_last(&buffer->entry, &alloc->buffers)) {  in binder_delete_free_buffer()
647 		next = binder_buffer_next(buffer);  in binder_delete_free_buffer()
648 		if (buffer_start_page(next) == buffer_start_page(buffer))  in binder_delete_free_buffer()
652 	binder_lru_freelist_add(alloc, buffer_start_page(buffer),  in binder_delete_free_buffer()
653 				buffer_start_page(buffer) + PAGE_SIZE);  in binder_delete_free_buffer()
655 	list_del(&buffer->entry);  in binder_delete_free_buffer()
656 	kfree(buffer);  in binder_delete_free_buffer()
660 				   struct binder_buffer *buffer)  in binder_free_buf_locked()  argument
664 	buffer_size = binder_alloc_buffer_size(alloc, buffer);  in binder_free_buf_locked()
666 	size = ALIGN(buffer->data_size, sizeof(void *)) +  in binder_free_buf_locked()
667 		ALIGN(buffer->offsets_size, sizeof(void *)) +  in binder_free_buf_locked()
668 		ALIGN(buffer->extra_buffers_size, sizeof(void *));  in binder_free_buf_locked()
672 		      alloc->pid, buffer, size, buffer_size);  in binder_free_buf_locked()
674 	BUG_ON(buffer->free);  in binder_free_buf_locked()
676 	BUG_ON(buffer->transaction != NULL);  in binder_free_buf_locked()
677 	BUG_ON(buffer->user_data < alloc->buffer);  in binder_free_buf_locked()
678 	BUG_ON(buffer->user_data > alloc->buffer + alloc->buffer_size);  in binder_free_buf_locked()
680 	if (buffer->async_transaction) {  in binder_free_buf_locked()
687 	binder_lru_freelist_add(alloc, PAGE_ALIGN(buffer->user_data),  in binder_free_buf_locked()
688 				(buffer->user_data + buffer_size) & PAGE_MASK);  in binder_free_buf_locked()
690 	rb_erase(&buffer->rb_node, &alloc->allocated_buffers);  in binder_free_buf_locked()
691 	buffer->free = 1;  in binder_free_buf_locked()
692 	if (!list_is_last(&buffer->entry, &alloc->buffers)) {  in binder_free_buf_locked()
693 		struct binder_buffer *next = binder_buffer_next(buffer);  in binder_free_buf_locked()
700 	if (alloc->buffers.next != &buffer->entry) {  in binder_free_buf_locked()
701 		struct binder_buffer *prev = binder_buffer_prev(buffer);  in binder_free_buf_locked()
704 			binder_delete_free_buffer(alloc, buffer);  in binder_free_buf_locked()
706 			buffer = prev;  in binder_free_buf_locked()
709 	binder_insert_free_buffer(alloc, buffer);  in binder_free_buf_locked()
713  * binder_alloc_get_page() - get kernel pointer for given buffer offset
715  * @buffer: binder buffer to be accessed
716  * @buffer_offset: offset into @buffer data
720  * at @buffer_offset into @buffer->user_data. If @pgoffp is not
724  * to a valid address within the @buffer and that @buffer is
732 					  struct binder_buffer *buffer,  in binder_alloc_get_page()  argument
737 		(buffer->user_data - alloc->buffer);  in binder_alloc_get_page()
748  * binder_alloc_clear_buf() - zero out buffer
750  * @buffer: binder buffer to be cleared
752  * memset the given buffer to 0
755 				   struct binder_buffer *buffer)  in binder_alloc_clear_buf()  argument
757 	size_t bytes = binder_alloc_buffer_size(alloc, buffer);  in binder_alloc_clear_buf()
765 		page = binder_alloc_get_page(alloc, buffer,  in binder_alloc_clear_buf()
775  * binder_alloc_free_buf() - free a binder buffer
777  * @buffer:	kernel pointer to buffer
779  * Free the buffer allocated via binder_alloc_new_buf()
782 			    struct binder_buffer *buffer)  in binder_alloc_free_buf()  argument
792 	if (buffer->clear_on_free) {  in binder_alloc_free_buf()
793 		binder_alloc_clear_buf(alloc, buffer);  in binder_alloc_free_buf()
794 		buffer->clear_on_free = false;  in binder_alloc_free_buf()
797 	binder_free_buf_locked(alloc, buffer);  in binder_alloc_free_buf()
817 	struct binder_buffer *buffer;  in binder_alloc_mmap_handler()  local
837 	alloc->buffer = vma->vm_start;  in binder_alloc_mmap_handler()
853 	buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);  in binder_alloc_mmap_handler()
854 	if (!buffer) {  in binder_alloc_mmap_handler()
856 		failure_string = "alloc buffer struct";  in binder_alloc_mmap_handler()
860 	buffer->user_data = alloc->buffer;  in binder_alloc_mmap_handler()
861 	list_add(&buffer->entry, &alloc->buffers);  in binder_alloc_mmap_handler()
862 	buffer->free = 1;  in binder_alloc_mmap_handler()
863 	binder_insert_free_buffer(alloc, buffer);  in binder_alloc_mmap_handler()
875 	alloc->buffer = 0;  in binder_alloc_mmap_handler()
893 	struct binder_buffer *buffer;  in binder_alloc_deferred_release()  local
900 		buffer = rb_entry(n, struct binder_buffer, rb_node);  in binder_alloc_deferred_release()
903 		BUG_ON(buffer->transaction);  in binder_alloc_deferred_release()
905 		if (buffer->clear_on_free) {  in binder_alloc_deferred_release()
906 			binder_alloc_clear_buf(alloc, buffer);  in binder_alloc_deferred_release()
907 			buffer->clear_on_free = false;  in binder_alloc_deferred_release()
909 		binder_free_buf_locked(alloc, buffer);  in binder_alloc_deferred_release()
914 		buffer = list_first_entry(&alloc->buffers,  in binder_alloc_deferred_release()
916 		WARN_ON(!buffer->free);  in binder_alloc_deferred_release()
918 		list_del(&buffer->entry);  in binder_alloc_deferred_release()
920 		kfree(buffer);  in binder_alloc_deferred_release()
936 			page_addr = alloc->buffer + i * PAGE_SIZE;  in binder_alloc_deferred_release()
956  * binder_alloc_print_allocated() - print buffer info
960  * Prints information about every buffer associated with
966 	struct binder_buffer *buffer;  in binder_alloc_print_allocated()  local
971 		buffer = rb_entry(n, struct binder_buffer, rb_node);  in binder_alloc_print_allocated()
972 		seq_printf(m, "  buffer %d: %lx size %zd:%zd:%zd %s\n",  in binder_alloc_print_allocated()
973 			   buffer->debug_id,  in binder_alloc_print_allocated()
974 			   buffer->user_data - alloc->buffer,  in binder_alloc_print_allocated()
975 			   buffer->data_size, buffer->offsets_size,  in binder_alloc_print_allocated()
976 			   buffer->extra_buffers_size,  in binder_alloc_print_allocated()
977 			   buffer->transaction ? "active" : "delivered");  in binder_alloc_print_allocated()
1082 	page_addr = alloc->buffer + index * PAGE_SIZE;  in binder_alloc_free_page()
1185  * check_buffer() - verify that buffer/offset is safe to access
1187  * @buffer: binder buffer to be accessed
1188  * @offset: offset into @buffer data
1192  * @buffer and that the buffer is currently active and not freeable.
1194  * allowed to touch the buffer in two cases:
1196  * 1) when the buffer is being created:
1197  *     (buffer->free == 0 && buffer->allow_user_free == 0)
1198  * 2) when the buffer is being torn down:
1199  *     (buffer->free == 0 && buffer->transaction == NULL).
1201  * Return: true if the buffer is safe to access
1204 				struct binder_buffer *buffer,  in check_buffer()  argument
1207 	size_t buffer_size = binder_alloc_buffer_size(alloc, buffer);  in check_buffer()
1212 		!buffer->free &&  in check_buffer()
1213 		(!buffer->allow_user_free || !buffer->transaction);  in check_buffer()
1219  * @buffer: binder buffer to be accessed
1220  * @buffer_offset: offset into @buffer data
1221  * @from: userspace pointer to source buffer
1224  * Copy bytes from source userspace to target buffer.
1230 				 struct binder_buffer *buffer,  in binder_alloc_copy_user_to_buffer()  argument
1235 	if (!check_buffer(alloc, buffer, buffer_offset, bytes))  in binder_alloc_copy_user_to_buffer()
1245 		page = binder_alloc_get_page(alloc, buffer,  in binder_alloc_copy_user_to_buffer()
1262 				       struct binder_buffer *buffer,  in binder_alloc_do_buffer_copy()  argument
1268 	if (!check_buffer(alloc, buffer, buffer_offset, bytes))  in binder_alloc_do_buffer_copy()
1276 		page = binder_alloc_get_page(alloc, buffer,  in binder_alloc_do_buffer_copy()
1292 				struct binder_buffer *buffer,  in binder_alloc_copy_to_buffer()  argument
1297 	return binder_alloc_do_buffer_copy(alloc, true, buffer, buffer_offset,  in binder_alloc_copy_to_buffer()
1303 				  struct binder_buffer *buffer,  in binder_alloc_copy_from_buffer()  argument
1307 	return binder_alloc_do_buffer_copy(alloc, false, buffer, buffer_offset,  in binder_alloc_copy_from_buffer()