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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pad.c (3160B)

      1/*
      2 * Copyright 2015 Red Hat Inc.
      3 *
      4 * Permission is hereby granted, free of charge, to any person obtaining a
      5 * copy of this software and associated documentation files (the "Software"),
      6 * to deal in the Software without restriction, including without limitation
      7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
      8 * and/or sell copies of the Software, and to permit persons to whom the
      9 * Software is furnished to do so, subject to the following conditions:
     10 *
     11 * The above copyright notice and this permission notice shall be included in
     12 * all copies or substantial portions of the Software.
     13 *
     14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
     18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     20 * OTHER DEALINGS IN THE SOFTWARE.
     21 *
     22 * Authors: Ben Skeggs <bskeggs@redhat.com>
     23 */
     24#include "pad.h"
     25
     26static void
     27nvkm_i2c_pad_mode_locked(struct nvkm_i2c_pad *pad, enum nvkm_i2c_pad_mode mode)
     28{
     29	PAD_TRACE(pad, "-> %s", (mode == NVKM_I2C_PAD_AUX) ? "aux" :
     30			      (mode == NVKM_I2C_PAD_I2C) ? "i2c" : "off");
     31	if (pad->func->mode)
     32		pad->func->mode(pad, mode);
     33}
     34
     35void
     36nvkm_i2c_pad_mode(struct nvkm_i2c_pad *pad, enum nvkm_i2c_pad_mode mode)
     37{
     38	PAD_TRACE(pad, "mode %d", mode);
     39	mutex_lock(&pad->mutex);
     40	nvkm_i2c_pad_mode_locked(pad, mode);
     41	pad->mode = mode;
     42	mutex_unlock(&pad->mutex);
     43}
     44
     45void
     46nvkm_i2c_pad_release(struct nvkm_i2c_pad *pad)
     47{
     48	PAD_TRACE(pad, "release");
     49	if (pad->mode == NVKM_I2C_PAD_OFF)
     50		nvkm_i2c_pad_mode_locked(pad, pad->mode);
     51	mutex_unlock(&pad->mutex);
     52}
     53
     54int
     55nvkm_i2c_pad_acquire(struct nvkm_i2c_pad *pad, enum nvkm_i2c_pad_mode mode)
     56{
     57	PAD_TRACE(pad, "acquire");
     58	mutex_lock(&pad->mutex);
     59	if (pad->mode != mode) {
     60		if (pad->mode != NVKM_I2C_PAD_OFF) {
     61			mutex_unlock(&pad->mutex);
     62			return -EBUSY;
     63		}
     64		nvkm_i2c_pad_mode_locked(pad, mode);
     65	}
     66	return 0;
     67}
     68
     69void
     70nvkm_i2c_pad_fini(struct nvkm_i2c_pad *pad)
     71{
     72	PAD_TRACE(pad, "fini");
     73	nvkm_i2c_pad_mode_locked(pad, NVKM_I2C_PAD_OFF);
     74}
     75
     76void
     77nvkm_i2c_pad_init(struct nvkm_i2c_pad *pad)
     78{
     79	PAD_TRACE(pad, "init");
     80	nvkm_i2c_pad_mode_locked(pad, pad->mode);
     81}
     82
     83void
     84nvkm_i2c_pad_del(struct nvkm_i2c_pad **ppad)
     85{
     86	struct nvkm_i2c_pad *pad = *ppad;
     87	if (pad) {
     88		PAD_TRACE(pad, "dtor");
     89		list_del(&pad->head);
     90		kfree(pad);
     91		pad = NULL;
     92	}
     93}
     94
     95void
     96nvkm_i2c_pad_ctor(const struct nvkm_i2c_pad_func *func, struct nvkm_i2c *i2c,
     97		  int id, struct nvkm_i2c_pad *pad)
     98{
     99	pad->func = func;
    100	pad->i2c = i2c;
    101	pad->id = id;
    102	pad->mode = NVKM_I2C_PAD_OFF;
    103	mutex_init(&pad->mutex);
    104	list_add_tail(&pad->head, &i2c->pad);
    105	PAD_TRACE(pad, "ctor");
    106}
    107
    108int
    109nvkm_i2c_pad_new_(const struct nvkm_i2c_pad_func *func, struct nvkm_i2c *i2c,
    110		  int id, struct nvkm_i2c_pad **ppad)
    111{
    112	if (!(*ppad = kzalloc(sizeof(**ppad), GFP_KERNEL)))
    113		return -ENOMEM;
    114	nvkm_i2c_pad_ctor(func, i2c, id, *ppad);
    115	return 0;
    116}