51 static struct binder_buffer *binder_buffer_next(struct binder_buffer *buffer)  in binder_buffer_next()  argument
53 	return list_entry(buffer->entry.next, struct binder_buffer, entry);  in binder_buffer_next()
56 static struct binder_buffer *binder_buffer_prev(struct binder_buffer *buffer)  in binder_buffer_prev()  argument
58 	return list_entry(buffer->entry.prev, struct binder_buffer, entry);  in binder_buffer_prev()
62 				       struct binder_buffer *buffer)  in binder_alloc_buffer_size()  argument
64 	if (list_is_last(&buffer->entry, &alloc->buffers))  in binder_alloc_buffer_size()
65 		return alloc->buffer + alloc->buffer_size - buffer->user_data;  in binder_alloc_buffer_size()
66 	return binder_buffer_next(buffer)->user_data - buffer->user_data;  in binder_alloc_buffer_size()
74 	struct binder_buffer *buffer;  in binder_insert_free_buffer()  local
83 		     "%d: add free buffer, size %zd, at %pK\n",  in binder_insert_free_buffer()
88 		buffer = rb_entry(parent, struct binder_buffer, rb_node);  in binder_insert_free_buffer()
89 		BUG_ON(!buffer->free);  in binder_insert_free_buffer()
91 		buffer_size = binder_alloc_buffer_size(alloc, buffer);  in binder_insert_free_buffer()
107 	struct binder_buffer *buffer;  in binder_insert_allocated_buffer_locked()  local
113 		buffer = rb_entry(parent, struct binder_buffer, rb_node);  in binder_insert_allocated_buffer_locked()
114 		BUG_ON(buffer->free);  in binder_insert_allocated_buffer_locked()
116 		if (new_buffer->user_data < buffer->user_data)  in binder_insert_allocated_buffer_locked()
118 		else if (new_buffer->user_data > buffer->user_data)  in binder_insert_allocated_buffer_locked()
132 	struct binder_buffer *buffer;  in binder_alloc_prepare_to_free_locked()  local
138 		buffer = rb_entry(n, struct binder_buffer, rb_node);  in binder_alloc_prepare_to_free_locked()
139 		BUG_ON(buffer->free);  in binder_alloc_prepare_to_free_locked()
141 		if (uptr < buffer->user_data)  in binder_alloc_prepare_to_free_locked()
143 		else if (uptr > buffer->user_data)  in binder_alloc_prepare_to_free_locked()
148 			 * free the buffer when in use by kernel or  in binder_alloc_prepare_to_free_locked()
151 			if (!buffer->allow_user_free)  in binder_alloc_prepare_to_free_locked()
153 			buffer->allow_user_free = 0;  in binder_alloc_prepare_to_free_locked()
154 			return buffer;  in binder_alloc_prepare_to_free_locked()
161  * binder_alloc_prepare_to_free() - get buffer given user ptr
163  * @user_ptr:	User pointer to buffer data
165  * Validate userspace pointer to buffer data and return buffer corresponding to
166  * that user pointer. Search the rb tree for buffer that matches user data
169  * Return:	Pointer to buffer or NULL
174 	struct binder_buffer *buffer;  in binder_alloc_prepare_to_free()  local
177 	buffer = binder_alloc_prepare_to_free_locked(alloc, user_ptr);  in binder_alloc_prepare_to_free()
179 	return buffer;  in binder_alloc_prepare_to_free()
205 		page = &alloc->pages[(page_addr - alloc->buffer) / PAGE_SIZE];  in binder_update_page_range()
232 		index = (page_addr - alloc->buffer) / PAGE_SIZE;  in binder_update_page_range()
284 		index = (page_addr - alloc->buffer) / PAGE_SIZE;  in binder_update_page_range()
320 	 * If we see alloc->vma is not NULL, buffer data structures set up  in binder_alloc_set_vma()
352 	struct binder_buffer *buffer;  in debug_low_async_space_locked()  local
358 		buffer = rb_entry(n, struct binder_buffer, rb_node);  in debug_low_async_space_locked()
359 		if (buffer->pid != pid)  in debug_low_async_space_locked()
361 		if (!buffer->async_transaction)  in debug_low_async_space_locked()
363 		total_alloc_size += binder_alloc_buffer_size(alloc, buffer)  in debug_low_async_space_locked()
370 	 * async space (which is 25% of total buffer size). Oneway spam is only  in debug_low_async_space_locked()
394 	struct binder_buffer *buffer;  in binder_alloc_new_buf_locked()  local
438 		buffer = rb_entry(n, struct binder_buffer, rb_node);  in binder_alloc_new_buf_locked()
439 		BUG_ON(!buffer->free);  in binder_alloc_new_buf_locked()
440 		buffer_size = binder_alloc_buffer_size(alloc, buffer);  in binder_alloc_new_buf_locked()
462 			buffer = rb_entry(n, struct binder_buffer, rb_node);  in binder_alloc_new_buf_locked()
463 			buffer_size = binder_alloc_buffer_size(alloc, buffer);  in binder_alloc_new_buf_locked()
471 			buffer = rb_entry(n, struct binder_buffer, rb_node);  in binder_alloc_new_buf_locked()
472 			buffer_size = binder_alloc_buffer_size(alloc, buffer);  in binder_alloc_new_buf_locked()
489 		buffer = rb_entry(best_fit, struct binder_buffer, rb_node);  in binder_alloc_new_buf_locked()
490 		buffer_size = binder_alloc_buffer_size(alloc, buffer);  in binder_alloc_new_buf_locked()
494 		     "%d: binder_alloc_buf size %zd got buffer %pK size %zd\n",  in binder_alloc_new_buf_locked()
495 		      alloc->pid, size, buffer, buffer_size);  in binder_alloc_new_buf_locked()
498 		(((uintptr_t)buffer->user_data + buffer_size) & PAGE_MASK);  in binder_alloc_new_buf_locked()
501 		(void __user *)PAGE_ALIGN((uintptr_t)buffer->user_data + size);  in binder_alloc_new_buf_locked()
505 		PAGE_ALIGN((uintptr_t)buffer->user_data), end_page_addr);  in binder_alloc_new_buf_locked()
512 		new_buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);  in binder_alloc_new_buf_locked()
514 			pr_err("%s: %d failed to alloc new buffer struct\n",  in binder_alloc_new_buf_locked()
518 		new_buffer->user_data = (u8 __user *)buffer->user_data + size;  in binder_alloc_new_buf_locked()
519 		list_add(&new_buffer->entry, &buffer->entry);  in binder_alloc_new_buf_locked()
525 	buffer->free = 0;  in binder_alloc_new_buf_locked()
526 	buffer->allow_user_free = 0;  in binder_alloc_new_buf_locked()
527 	binder_insert_allocated_buffer_locked(alloc, buffer);  in binder_alloc_new_buf_locked()
530 		      alloc->pid, size, buffer);  in binder_alloc_new_buf_locked()
531 	buffer->data_size = data_size;  in binder_alloc_new_buf_locked()
532 	buffer->offsets_size = offsets_size;  in binder_alloc_new_buf_locked()
533 	buffer->async_transaction = is_async;  in binder_alloc_new_buf_locked()
534 	buffer->extra_buffers_size = extra_buffers_size;  in binder_alloc_new_buf_locked()
535 	buffer->pid = pid;  in binder_alloc_new_buf_locked()
536 	buffer->oneway_spam_suspect = false;  in binder_alloc_new_buf_locked()
546 			 * buffer size).  in binder_alloc_new_buf_locked()
548 			buffer->oneway_spam_suspect = debug_low_async_space_locked(alloc, pid);  in binder_alloc_new_buf_locked()
553 	return buffer;  in binder_alloc_new_buf_locked()
557 				 PAGE_ALIGN((uintptr_t)buffer->user_data),  in binder_alloc_new_buf_locked()
563  * binder_alloc_new_buf() - Allocate a new binder buffer
565  * @data_size:          size of user data buffer
566  * @offsets_size:       user specified buffer offset
568  * @is_async:           buffer for async transaction
571  * Allocate a new buffer given the requested sizes. Returns
572  * the kernel version of the buffer pointer. The size allocated
576  * Return:	The allocated buffer or %NULL if error
585 	struct binder_buffer *buffer;  in binder_alloc_new_buf()  local
588 	buffer = binder_alloc_new_buf_locked(alloc, data_size, offsets_size,  in binder_alloc_new_buf()
591 	return buffer;  in binder_alloc_new_buf()
594 static void __user *buffer_start_page(struct binder_buffer *buffer)  in buffer_start_page()  argument
596 	return (void __user *)((uintptr_t)buffer->user_data & PAGE_MASK);  in buffer_start_page()
599 static void __user *prev_buffer_end_page(struct binder_buffer *buffer)  in prev_buffer_end_page()  argument
602 		(((uintptr_t)(buffer->user_data) - 1) & PAGE_MASK);  in prev_buffer_end_page()
606 				      struct binder_buffer *buffer)  in binder_delete_free_buffer()  argument
611 	BUG_ON(alloc->buffers.next == &buffer->entry);  in binder_delete_free_buffer()
612 	prev = binder_buffer_prev(buffer);  in binder_delete_free_buffer()
614 	if (prev_buffer_end_page(prev) == buffer_start_page(buffer)) {  in binder_delete_free_buffer()
617 				   "%d: merge free, buffer %pK share page with %pK\n",  in binder_delete_free_buffer()
618 				   alloc->pid, buffer->user_data,  in binder_delete_free_buffer()
622 	if (!list_is_last(&buffer->entry, &alloc->buffers)) {  in binder_delete_free_buffer()
623 		next = binder_buffer_next(buffer);  in binder_delete_free_buffer()
624 		if (buffer_start_page(next) == buffer_start_page(buffer)) {  in binder_delete_free_buffer()
627 					   "%d: merge free, buffer %pK share page with %pK\n",  in binder_delete_free_buffer()
629 					   buffer->user_data,  in binder_delete_free_buffer()
634 	if (PAGE_ALIGNED(buffer->user_data)) {  in binder_delete_free_buffer()
636 				   "%d: merge free, buffer start %pK is page aligned\n",  in binder_delete_free_buffer()
637 				   alloc->pid, buffer->user_data);  in binder_delete_free_buffer()
643 				   "%d: merge free, buffer %pK do not share page with %pK or %pK\n",  in binder_delete_free_buffer()
644 				   alloc->pid, buffer->user_data,  in binder_delete_free_buffer()
647 		binder_update_page_range(alloc, 0, buffer_start_page(buffer),  in binder_delete_free_buffer()
648 					 buffer_start_page(buffer) + PAGE_SIZE);  in binder_delete_free_buffer()
650 	list_del(&buffer->entry);  in binder_delete_free_buffer()
651 	kfree(buffer);  in binder_delete_free_buffer()
655 				   struct binder_buffer *buffer)  in binder_free_buf_locked()  argument
659 	buffer_size = binder_alloc_buffer_size(alloc, buffer);  in binder_free_buf_locked()
661 	size = ALIGN(buffer->data_size, sizeof(void *)) +  in binder_free_buf_locked()
662 		ALIGN(buffer->offsets_size, sizeof(void *)) +  in binder_free_buf_locked()
663 		ALIGN(buffer->extra_buffers_size, sizeof(void *));  in binder_free_buf_locked()
667 		      alloc->pid, buffer, size, buffer_size);  in binder_free_buf_locked()
669 	BUG_ON(buffer->free);  in binder_free_buf_locked()
671 	BUG_ON(buffer->transaction != NULL);  in binder_free_buf_locked()
672 	BUG_ON(buffer->user_data < alloc->buffer);  in binder_free_buf_locked()
673 	BUG_ON(buffer->user_data > alloc->buffer + alloc->buffer_size);  in binder_free_buf_locked()
675 	if (buffer->async_transaction) {  in binder_free_buf_locked()
684 		(void __user *)PAGE_ALIGN((uintptr_t)buffer->user_data),  in binder_free_buf_locked()
686 			  buffer->user_data + buffer_size) & PAGE_MASK));  in binder_free_buf_locked()
688 	rb_erase(&buffer->rb_node, &alloc->allocated_buffers);  in binder_free_buf_locked()
689 	buffer->free = 1;  in binder_free_buf_locked()
690 	if (!list_is_last(&buffer->entry, &alloc->buffers)) {  in binder_free_buf_locked()
691 		struct binder_buffer *next = binder_buffer_next(buffer);  in binder_free_buf_locked()
698 	if (alloc->buffers.next != &buffer->entry) {  in binder_free_buf_locked()
699 		struct binder_buffer *prev = binder_buffer_prev(buffer);  in binder_free_buf_locked()
702 			binder_delete_free_buffer(alloc, buffer);  in binder_free_buf_locked()
704 			buffer = prev;  in binder_free_buf_locked()
707 	binder_insert_free_buffer(alloc, buffer);  in binder_free_buf_locked()
711 				   struct binder_buffer *buffer);
713  * binder_alloc_free_buf() - free a binder buffer
715  * @buffer:	kernel pointer to buffer
717  * Free the buffer allocated via binder_alloc_new_buf()
720 			    struct binder_buffer *buffer)  in binder_alloc_free_buf()  argument
730 	if (buffer->clear_on_free) {  in binder_alloc_free_buf()
731 		binder_alloc_clear_buf(alloc, buffer);  in binder_alloc_free_buf()
732 		buffer->clear_on_free = false;  in binder_alloc_free_buf()
735 	binder_free_buf_locked(alloc, buffer);  in binder_alloc_free_buf()
757 	struct binder_buffer *buffer;  in binder_alloc_mmap_handler()  local
769 	alloc->buffer = (void __user *)vma->vm_start;  in binder_alloc_mmap_handler()
780 	buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);  in binder_alloc_mmap_handler()
781 	if (!buffer) {  in binder_alloc_mmap_handler()
783 		failure_string = "alloc buffer struct";  in binder_alloc_mmap_handler()
787 	buffer->user_data = alloc->buffer;  in binder_alloc_mmap_handler()
788 	list_add(&buffer->entry, &alloc->buffers);  in binder_alloc_mmap_handler()
789 	buffer->free = 1;  in binder_alloc_mmap_handler()
790 	binder_insert_free_buffer(alloc, buffer);  in binder_alloc_mmap_handler()
801 	alloc->buffer = NULL;  in binder_alloc_mmap_handler()
818 	struct binder_buffer *buffer;  in binder_alloc_deferred_release()  local
825 		buffer = rb_entry(n, struct binder_buffer, rb_node);  in binder_alloc_deferred_release()
828 		BUG_ON(buffer->transaction);  in binder_alloc_deferred_release()
830 		if (buffer->clear_on_free) {  in binder_alloc_deferred_release()
831 			binder_alloc_clear_buf(alloc, buffer);  in binder_alloc_deferred_release()
832 			buffer->clear_on_free = false;  in binder_alloc_deferred_release()
834 		binder_free_buf_locked(alloc, buffer);  in binder_alloc_deferred_release()
839 		buffer = list_first_entry(&alloc->buffers,  in binder_alloc_deferred_release()
841 		WARN_ON(!buffer->free);  in binder_alloc_deferred_release()
843 		list_del(&buffer->entry);  in binder_alloc_deferred_release()
845 		kfree(buffer);  in binder_alloc_deferred_release()
861 			page_addr = alloc->buffer + i * PAGE_SIZE;  in binder_alloc_deferred_release()
881 				struct binder_buffer *buffer)  in print_binder_buffer()  argument
884 		   prefix, buffer->debug_id, buffer->user_data,  in print_binder_buffer()
885 		   buffer->data_size, buffer->offsets_size,  in print_binder_buffer()
886 		   buffer->extra_buffers_size,  in print_binder_buffer()
887 		   buffer->transaction ? "active" : "delivered");  in print_binder_buffer()
891  * binder_alloc_print_allocated() - print buffer info
895  * Prints information about every buffer associated with
905 		print_binder_buffer(m, "  buffer",  in binder_alloc_print_allocated()
1009 	page_addr = (uintptr_t)alloc->buffer + index * PAGE_SIZE;  in binder_alloc_free_page()
1101  * check_buffer() - verify that buffer/offset is safe to access
1103  * @buffer: binder buffer to be accessed
1104  * @offset: offset into @buffer data
1108  * @buffer and that the buffer is currently active and not freeable.
1110  * allowed to touch the buffer in two cases:
1112  * 1) when the buffer is being created:
1113  *     (buffer->free == 0 && buffer->allow_user_free == 0)
1114  * 2) when the buffer is being torn down:
1115  *     (buffer->free == 0 && buffer->transaction == NULL).
1117  * Return: true if the buffer is safe to access
1120 				struct binder_buffer *buffer,  in check_buffer()  argument
1123 	size_t buffer_size = binder_alloc_buffer_size(alloc, buffer);  in check_buffer()
1128 		!buffer->free &&  in check_buffer()
1129 		(!buffer->allow_user_free || !buffer->transaction);  in check_buffer()
1133  * binder_alloc_get_page() - get kernel pointer for given buffer offset
1135  * @buffer: binder buffer to be accessed
1136  * @buffer_offset: offset into @buffer data
1140  * at @buffer_offset into @buffer->user_data. If @pgoffp is not
1144  * to a valid address within the @buffer and that @buffer is
1152 					  struct binder_buffer *buffer,  in binder_alloc_get_page()  argument
1157 		(buffer->user_data - alloc->buffer);  in binder_alloc_get_page()
1168  * binder_alloc_clear_buf() - zero out buffer
1170  * @buffer: binder buffer to be cleared
1172  * memset the given buffer to 0
1175 				   struct binder_buffer *buffer)  in binder_alloc_clear_buf()  argument
1177 	size_t bytes = binder_alloc_buffer_size(alloc, buffer);  in binder_alloc_clear_buf()
1186 		page = binder_alloc_get_page(alloc, buffer,  in binder_alloc_clear_buf()
1200  * @buffer: binder buffer to be accessed
1201  * @buffer_offset: offset into @buffer data
1202  * @from: userspace pointer to source buffer
1205  * Copy bytes from source userspace to target buffer.
1211 				 struct binder_buffer *buffer,  in binder_alloc_copy_user_to_buffer()  argument
1216 	if (!check_buffer(alloc, buffer, buffer_offset, bytes))  in binder_alloc_copy_user_to_buffer()
1226 		page = binder_alloc_get_page(alloc, buffer,  in binder_alloc_copy_user_to_buffer()
1243 				       struct binder_buffer *buffer,  in binder_alloc_do_buffer_copy()  argument
1249 	if (!check_buffer(alloc, buffer, buffer_offset, bytes))  in binder_alloc_do_buffer_copy()
1259 		page = binder_alloc_get_page(alloc, buffer,  in binder_alloc_do_buffer_copy()
1282 				struct binder_buffer *buffer,  in binder_alloc_copy_to_buffer()  argument
1287 	return binder_alloc_do_buffer_copy(alloc, true, buffer, buffer_offset,  in binder_alloc_copy_to_buffer()
1293 				  struct binder_buffer *buffer,  in binder_alloc_copy_from_buffer()  argument
1297 	return binder_alloc_do_buffer_copy(alloc, false, buffer, buffer_offset,  in binder_alloc_copy_from_buffer()