cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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u_f.h (2695B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * u_f.h
      4 *
      5 * Utility definitions for USB functions
      6 *
      7 * Copyright (c) 2013 Samsung Electronics Co., Ltd.
      8 *		http://www.samsung.com
      9 *
     10 * Author: Andrzej Pietrasiewicz <andrzejtp2010@gmail.com>
     11 */
     12
     13#ifndef __U_F_H__
     14#define __U_F_H__
     15
     16#include <linux/usb/gadget.h>
     17#include <linux/overflow.h>
     18
     19/* Variable Length Array Macros **********************************************/
     20#define vla_group(groupname) size_t groupname##__next = 0
     21#define vla_group_size(groupname) groupname##__next
     22
     23#define vla_item(groupname, type, name, n) \
     24	size_t groupname##_##name##__offset = ({			       \
     25		size_t offset = 0;					       \
     26		if (groupname##__next != SIZE_MAX) {			       \
     27			size_t align_mask = __alignof__(type) - 1;	       \
     28			size_t size = array_size(n, sizeof(type));	       \
     29			offset = (groupname##__next + align_mask) &	       \
     30				  ~align_mask;				       \
     31			if (check_add_overflow(offset, size,		       \
     32					       &groupname##__next)) {          \
     33				groupname##__next = SIZE_MAX;		       \
     34				offset = 0;				       \
     35			}						       \
     36		}							       \
     37		offset;							       \
     38	})
     39
     40#define vla_item_with_sz(groupname, type, name, n) \
     41	size_t groupname##_##name##__sz = array_size(n, sizeof(type));	        \
     42	size_t groupname##_##name##__offset = ({			        \
     43		size_t offset = 0;						\
     44		if (groupname##__next != SIZE_MAX) {				\
     45			size_t align_mask = __alignof__(type) - 1;		\
     46			offset = (groupname##__next + align_mask) &		\
     47				  ~align_mask;					\
     48			if (check_add_overflow(offset, groupname##_##name##__sz,\
     49							&groupname##__next)) {	\
     50				groupname##__next = SIZE_MAX;			\
     51				offset = 0;					\
     52			}							\
     53		}								\
     54		offset;								\
     55	})
     56
     57#define vla_ptr(ptr, groupname, name) \
     58	((void *) ((char *)ptr + groupname##_##name##__offset))
     59
     60struct usb_ep;
     61struct usb_request;
     62
     63/**
     64 * alloc_ep_req - returns a usb_request allocated by the gadget driver and
     65 * allocates the request's buffer.
     66 *
     67 * @ep: the endpoint to allocate a usb_request
     68 * @len: usb_requests's buffer suggested size
     69 *
     70 * In case @ep direction is OUT, the @len will be aligned to ep's
     71 * wMaxPacketSize. In order to avoid memory leaks or drops, *always* use
     72 * usb_requests's length (req->length) to refer to the allocated buffer size.
     73 * Requests allocated via alloc_ep_req() *must* be freed by free_ep_req().
     74 */
     75struct usb_request *alloc_ep_req(struct usb_ep *ep, size_t len);
     76
     77/* Frees a usb_request previously allocated by alloc_ep_req() */
     78static inline void free_ep_req(struct usb_ep *ep, struct usb_request *req)
     79{
     80	WARN_ON(req->buf == NULL);
     81	kfree(req->buf);
     82	req->buf = NULL;
     83	usb_ep_free_request(ep, req);
     84}
     85
     86#endif /* __U_F_H__ */