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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mtd.c (2749B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/****************************************************************************
      3 * Driver for Solarflare network controllers and boards
      4 * Copyright 2005-2006 Fen Systems Ltd.
      5 * Copyright 2006-2013 Solarflare Communications Inc.
      6 */
      7
      8#include <linux/module.h>
      9#include <linux/mtd/mtd.h>
     10#include <linux/slab.h>
     11#include <linux/rtnetlink.h>
     12
     13#include "net_driver.h"
     14#include "efx.h"
     15
     16#define to_ef4_mtd_partition(mtd)				\
     17	container_of(mtd, struct ef4_mtd_partition, mtd)
     18
     19/* MTD interface */
     20
     21static int ef4_mtd_erase(struct mtd_info *mtd, struct erase_info *erase)
     22{
     23	struct ef4_nic *efx = mtd->priv;
     24
     25	return efx->type->mtd_erase(mtd, erase->addr, erase->len);
     26}
     27
     28static void ef4_mtd_sync(struct mtd_info *mtd)
     29{
     30	struct ef4_mtd_partition *part = to_ef4_mtd_partition(mtd);
     31	struct ef4_nic *efx = mtd->priv;
     32	int rc;
     33
     34	rc = efx->type->mtd_sync(mtd);
     35	if (rc)
     36		pr_err("%s: %s sync failed (%d)\n",
     37		       part->name, part->dev_type_name, rc);
     38}
     39
     40static void ef4_mtd_remove_partition(struct ef4_mtd_partition *part)
     41{
     42	int rc;
     43
     44	for (;;) {
     45		rc = mtd_device_unregister(&part->mtd);
     46		if (rc != -EBUSY)
     47			break;
     48		ssleep(1);
     49	}
     50	WARN_ON(rc);
     51	list_del(&part->node);
     52}
     53
     54int ef4_mtd_add(struct ef4_nic *efx, struct ef4_mtd_partition *parts,
     55		size_t n_parts, size_t sizeof_part)
     56{
     57	struct ef4_mtd_partition *part;
     58	size_t i;
     59
     60	for (i = 0; i < n_parts; i++) {
     61		part = (struct ef4_mtd_partition *)((char *)parts +
     62						    i * sizeof_part);
     63
     64		part->mtd.writesize = 1;
     65
     66		part->mtd.owner = THIS_MODULE;
     67		part->mtd.priv = efx;
     68		part->mtd.name = part->name;
     69		part->mtd._erase = ef4_mtd_erase;
     70		part->mtd._read = efx->type->mtd_read;
     71		part->mtd._write = efx->type->mtd_write;
     72		part->mtd._sync = ef4_mtd_sync;
     73
     74		efx->type->mtd_rename(part);
     75
     76		if (mtd_device_register(&part->mtd, NULL, 0))
     77			goto fail;
     78
     79		/* Add to list in order - ef4_mtd_remove() depends on this */
     80		list_add_tail(&part->node, &efx->mtd_list);
     81	}
     82
     83	return 0;
     84
     85fail:
     86	while (i--) {
     87		part = (struct ef4_mtd_partition *)((char *)parts +
     88						    i * sizeof_part);
     89		ef4_mtd_remove_partition(part);
     90	}
     91	/* Failure is unlikely here, but probably means we're out of memory */
     92	return -ENOMEM;
     93}
     94
     95void ef4_mtd_remove(struct ef4_nic *efx)
     96{
     97	struct ef4_mtd_partition *parts, *part, *next;
     98
     99	WARN_ON(ef4_dev_registered(efx));
    100
    101	if (list_empty(&efx->mtd_list))
    102		return;
    103
    104	parts = list_first_entry(&efx->mtd_list, struct ef4_mtd_partition,
    105				 node);
    106
    107	list_for_each_entry_safe(part, next, &efx->mtd_list, node)
    108		ef4_mtd_remove_partition(part);
    109
    110	kfree(parts);
    111}
    112
    113void ef4_mtd_rename(struct ef4_nic *efx)
    114{
    115	struct ef4_mtd_partition *part;
    116
    117	ASSERT_RTNL();
    118
    119	list_for_each_entry(part, &efx->mtd_list, node)
    120		efx->type->mtd_rename(part);
    121}