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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procfs.c (12864B)


      1// SPDX-License-Identifier: GPL-2.0
      2/* Sysctl interface for parport devices.
      3 * 
      4 * Authors: David Campbell
      5 *          Tim Waugh <tim@cyberelk.demon.co.uk>
      6 *          Philip Blundell <philb@gnu.org>
      7 *          Andrea Arcangeli
      8 *          Riccardo Facchetti <fizban@tin.it>
      9 *
     10 * based on work by Grant Guenther <grant@torque.net>
     11 *              and Philip Blundell
     12 *
     13 * Cleaned up include files - Russell King <linux@arm.uk.linux.org>
     14 */
     15
     16#include <linux/string.h>
     17#include <linux/init.h>
     18#include <linux/module.h>
     19#include <linux/errno.h>
     20#include <linux/kernel.h>
     21#include <linux/slab.h>
     22#include <linux/parport.h>
     23#include <linux/ctype.h>
     24#include <linux/sysctl.h>
     25#include <linux/device.h>
     26
     27#include <linux/uaccess.h>
     28
     29#if defined(CONFIG_SYSCTL) && defined(CONFIG_PROC_FS)
     30
     31#define PARPORT_MIN_TIMESLICE_VALUE 1ul 
     32#define PARPORT_MAX_TIMESLICE_VALUE ((unsigned long) HZ)
     33#define PARPORT_MIN_SPINTIME_VALUE 1
     34#define PARPORT_MAX_SPINTIME_VALUE 1000
     35
     36static int do_active_device(struct ctl_table *table, int write,
     37		      void *result, size_t *lenp, loff_t *ppos)
     38{
     39	struct parport *port = (struct parport *)table->extra1;
     40	char buffer[256];
     41	struct pardevice *dev;
     42	int len = 0;
     43
     44	if (write)		/* can't happen anyway */
     45		return -EACCES;
     46
     47	if (*ppos) {
     48		*lenp = 0;
     49		return 0;
     50	}
     51	
     52	for (dev = port->devices; dev ; dev = dev->next) {
     53		if(dev == port->cad) {
     54			len += sprintf(buffer, "%s\n", dev->name);
     55		}
     56	}
     57
     58	if(!len) {
     59		len += sprintf(buffer, "%s\n", "none");
     60	}
     61
     62	if (len > *lenp)
     63		len = *lenp;
     64	else
     65		*lenp = len;
     66
     67	*ppos += len;
     68	memcpy(result, buffer, len);
     69	return 0;
     70}
     71
     72#ifdef CONFIG_PARPORT_1284
     73static int do_autoprobe(struct ctl_table *table, int write,
     74			void *result, size_t *lenp, loff_t *ppos)
     75{
     76	struct parport_device_info *info = table->extra2;
     77	const char *str;
     78	char buffer[256];
     79	int len = 0;
     80
     81	if (write) /* permissions stop this */
     82		return -EACCES;
     83
     84	if (*ppos) {
     85		*lenp = 0;
     86		return 0;
     87	}
     88	
     89	if ((str = info->class_name) != NULL)
     90		len += sprintf (buffer + len, "CLASS:%s;\n", str);
     91
     92	if ((str = info->model) != NULL)
     93		len += sprintf (buffer + len, "MODEL:%s;\n", str);
     94
     95	if ((str = info->mfr) != NULL)
     96		len += sprintf (buffer + len, "MANUFACTURER:%s;\n", str);
     97
     98	if ((str = info->description) != NULL)
     99		len += sprintf (buffer + len, "DESCRIPTION:%s;\n", str);
    100
    101	if ((str = info->cmdset) != NULL)
    102		len += sprintf (buffer + len, "COMMAND SET:%s;\n", str);
    103
    104	if (len > *lenp)
    105		len = *lenp;
    106	else
    107		*lenp = len;
    108
    109	*ppos += len;
    110
    111	memcpy(result, buffer, len);
    112	return 0;
    113}
    114#endif /* IEEE1284.3 support. */
    115
    116static int do_hardware_base_addr(struct ctl_table *table, int write,
    117				 void *result, size_t *lenp, loff_t *ppos)
    118{
    119	struct parport *port = (struct parport *)table->extra1;
    120	char buffer[20];
    121	int len = 0;
    122
    123	if (*ppos) {
    124		*lenp = 0;
    125		return 0;
    126	}
    127
    128	if (write) /* permissions prevent this anyway */
    129		return -EACCES;
    130
    131	len += sprintf (buffer, "%lu\t%lu\n", port->base, port->base_hi);
    132
    133	if (len > *lenp)
    134		len = *lenp;
    135	else
    136		*lenp = len;
    137
    138	*ppos += len;
    139	memcpy(result, buffer, len);
    140	return 0;
    141}
    142
    143static int do_hardware_irq(struct ctl_table *table, int write,
    144			   void *result, size_t *lenp, loff_t *ppos)
    145{
    146	struct parport *port = (struct parport *)table->extra1;
    147	char buffer[20];
    148	int len = 0;
    149
    150	if (*ppos) {
    151		*lenp = 0;
    152		return 0;
    153	}
    154
    155	if (write) /* permissions prevent this anyway */
    156		return -EACCES;
    157
    158	len += sprintf (buffer, "%d\n", port->irq);
    159
    160	if (len > *lenp)
    161		len = *lenp;
    162	else
    163		*lenp = len;
    164
    165	*ppos += len;
    166	memcpy(result, buffer, len);
    167	return 0;
    168}
    169
    170static int do_hardware_dma(struct ctl_table *table, int write,
    171			   void *result, size_t *lenp, loff_t *ppos)
    172{
    173	struct parport *port = (struct parport *)table->extra1;
    174	char buffer[20];
    175	int len = 0;
    176
    177	if (*ppos) {
    178		*lenp = 0;
    179		return 0;
    180	}
    181
    182	if (write) /* permissions prevent this anyway */
    183		return -EACCES;
    184
    185	len += sprintf (buffer, "%d\n", port->dma);
    186
    187	if (len > *lenp)
    188		len = *lenp;
    189	else
    190		*lenp = len;
    191
    192	*ppos += len;
    193	memcpy(result, buffer, len);
    194	return 0;
    195}
    196
    197static int do_hardware_modes(struct ctl_table *table, int write,
    198			     void *result, size_t *lenp, loff_t *ppos)
    199{
    200	struct parport *port = (struct parport *)table->extra1;
    201	char buffer[40];
    202	int len = 0;
    203
    204	if (*ppos) {
    205		*lenp = 0;
    206		return 0;
    207	}
    208
    209	if (write) /* permissions prevent this anyway */
    210		return -EACCES;
    211
    212	{
    213#define printmode(x)							\
    214do {									\
    215	if (port->modes & PARPORT_MODE_##x)				\
    216		len += sprintf(buffer + len, "%s%s", f++ ? "," : "", #x); \
    217} while (0)
    218		int f = 0;
    219		printmode(PCSPP);
    220		printmode(TRISTATE);
    221		printmode(COMPAT);
    222		printmode(EPP);
    223		printmode(ECP);
    224		printmode(DMA);
    225#undef printmode
    226	}
    227	buffer[len++] = '\n';
    228
    229	if (len > *lenp)
    230		len = *lenp;
    231	else
    232		*lenp = len;
    233
    234	*ppos += len;
    235	memcpy(result, buffer, len);
    236	return 0;
    237}
    238
    239#define PARPORT_PORT_DIR(CHILD) { .procname = NULL, .mode = 0555, .child = CHILD }
    240#define PARPORT_PARPORT_DIR(CHILD) { .procname = "parport", \
    241                                     .mode = 0555, .child = CHILD }
    242#define PARPORT_DEV_DIR(CHILD) { .procname = "dev", .mode = 0555, .child = CHILD }
    243#define PARPORT_DEVICES_ROOT_DIR  {  .procname = "devices", \
    244                                    .mode = 0555, .child = NULL }
    245
    246static const unsigned long parport_min_timeslice_value =
    247PARPORT_MIN_TIMESLICE_VALUE;
    248
    249static const unsigned long parport_max_timeslice_value =
    250PARPORT_MAX_TIMESLICE_VALUE;
    251
    252static const  int parport_min_spintime_value =
    253PARPORT_MIN_SPINTIME_VALUE;
    254
    255static const int parport_max_spintime_value =
    256PARPORT_MAX_SPINTIME_VALUE;
    257
    258
    259struct parport_sysctl_table {
    260	struct ctl_table_header *sysctl_header;
    261	struct ctl_table vars[12];
    262	struct ctl_table device_dir[2];
    263	struct ctl_table port_dir[2];
    264	struct ctl_table parport_dir[2];
    265	struct ctl_table dev_dir[2];
    266};
    267
    268static const struct parport_sysctl_table parport_sysctl_template = {
    269	.sysctl_header = NULL,
    270        {
    271		{
    272			.procname	= "spintime",
    273			.data		= NULL,
    274			.maxlen		= sizeof(int),
    275			.mode		= 0644,
    276			.proc_handler	= proc_dointvec_minmax,
    277			.extra1		= (void*) &parport_min_spintime_value,
    278			.extra2		= (void*) &parport_max_spintime_value
    279		},
    280		{
    281			.procname	= "base-addr",
    282			.data		= NULL,
    283			.maxlen		= 0,
    284			.mode		= 0444,
    285			.proc_handler	= do_hardware_base_addr
    286		},
    287		{
    288			.procname	= "irq",
    289			.data		= NULL,
    290			.maxlen		= 0,
    291			.mode		= 0444,
    292			.proc_handler	= do_hardware_irq
    293		},
    294		{
    295			.procname	= "dma",
    296			.data		= NULL,
    297			.maxlen		= 0,
    298			.mode		= 0444,
    299			.proc_handler	= do_hardware_dma
    300		},
    301		{
    302			.procname	= "modes",
    303			.data		= NULL,
    304			.maxlen		= 0,
    305			.mode		= 0444,
    306			.proc_handler	= do_hardware_modes
    307		},
    308		PARPORT_DEVICES_ROOT_DIR,
    309#ifdef CONFIG_PARPORT_1284
    310		{
    311			.procname	= "autoprobe",
    312			.data		= NULL,
    313			.maxlen		= 0,
    314			.mode		= 0444,
    315			.proc_handler	= do_autoprobe
    316		},
    317		{
    318			.procname	= "autoprobe0",
    319			.data		= NULL,
    320			.maxlen		= 0,
    321			.mode		= 0444,
    322			.proc_handler	= do_autoprobe
    323		},
    324		{
    325			.procname	= "autoprobe1",
    326			.data		= NULL,
    327			.maxlen		= 0,
    328			.mode		= 0444,
    329			.proc_handler	= do_autoprobe
    330		},
    331		{
    332			.procname	= "autoprobe2",
    333			.data		= NULL,
    334			.maxlen		= 0,
    335			.mode		= 0444,
    336			.proc_handler	= do_autoprobe
    337		},
    338		{
    339			.procname	= "autoprobe3",
    340			.data		= NULL,
    341			.maxlen		= 0,
    342			.mode		= 0444,
    343			.proc_handler	= do_autoprobe
    344		},
    345#endif /* IEEE 1284 support */
    346		{}
    347	},
    348	{
    349		{
    350			.procname	= "active",
    351			.data		= NULL,
    352			.maxlen		= 0,
    353			.mode		= 0444,
    354			.proc_handler	= do_active_device
    355		},
    356		{}
    357	},
    358	{
    359		PARPORT_PORT_DIR(NULL),
    360		{}
    361	},
    362	{
    363		PARPORT_PARPORT_DIR(NULL),
    364		{}
    365	},
    366	{
    367		PARPORT_DEV_DIR(NULL),
    368		{}
    369	}
    370};
    371
    372struct parport_device_sysctl_table
    373{
    374	struct ctl_table_header *sysctl_header;
    375	struct ctl_table vars[2];
    376	struct ctl_table device_dir[2];
    377	struct ctl_table devices_root_dir[2];
    378	struct ctl_table port_dir[2];
    379	struct ctl_table parport_dir[2];
    380	struct ctl_table dev_dir[2];
    381};
    382
    383static const struct parport_device_sysctl_table
    384parport_device_sysctl_template = {
    385	.sysctl_header = NULL,
    386	{
    387		{
    388			.procname 	= "timeslice",
    389			.data		= NULL,
    390			.maxlen		= sizeof(unsigned long),
    391			.mode		= 0644,
    392			.proc_handler	= proc_doulongvec_ms_jiffies_minmax,
    393			.extra1		= (void*) &parport_min_timeslice_value,
    394			.extra2		= (void*) &parport_max_timeslice_value
    395		},
    396	},
    397	{
    398		{
    399			.procname	= NULL,
    400			.data		= NULL,
    401			.maxlen		= 0,
    402			.mode		= 0555,
    403			.child		= NULL
    404		},
    405		{}
    406	},
    407	{
    408		PARPORT_DEVICES_ROOT_DIR,
    409		{}
    410	},
    411	{
    412		PARPORT_PORT_DIR(NULL),
    413		{}
    414	},
    415	{
    416		PARPORT_PARPORT_DIR(NULL),
    417		{}
    418	},
    419	{
    420		PARPORT_DEV_DIR(NULL),
    421		{}
    422	}
    423};
    424
    425struct parport_default_sysctl_table
    426{
    427	struct ctl_table_header *sysctl_header;
    428	struct ctl_table vars[3];
    429	struct ctl_table default_dir[2];
    430	struct ctl_table parport_dir[2];
    431	struct ctl_table dev_dir[2];
    432};
    433
    434static struct parport_default_sysctl_table
    435parport_default_sysctl_table = {
    436	.sysctl_header	= NULL,
    437	{
    438		{
    439			.procname	= "timeslice",
    440			.data		= &parport_default_timeslice,
    441			.maxlen		= sizeof(parport_default_timeslice),
    442			.mode		= 0644,
    443			.proc_handler	= proc_doulongvec_ms_jiffies_minmax,
    444			.extra1		= (void*) &parport_min_timeslice_value,
    445			.extra2		= (void*) &parport_max_timeslice_value
    446		},
    447		{
    448			.procname	= "spintime",
    449			.data		= &parport_default_spintime,
    450			.maxlen		= sizeof(parport_default_spintime),
    451			.mode		= 0644,
    452			.proc_handler	= proc_dointvec_minmax,
    453			.extra1		= (void*) &parport_min_spintime_value,
    454			.extra2		= (void*) &parport_max_spintime_value
    455		},
    456		{}
    457	},
    458	{
    459		{
    460			.procname	= "default",
    461			.mode		= 0555,
    462			.child		= parport_default_sysctl_table.vars
    463		},
    464		{}
    465	},
    466	{
    467		PARPORT_PARPORT_DIR(parport_default_sysctl_table.default_dir),
    468		{}
    469	},
    470	{
    471		PARPORT_DEV_DIR(parport_default_sysctl_table.parport_dir),
    472		{}
    473	}
    474};
    475
    476
    477int parport_proc_register(struct parport *port)
    478{
    479	struct parport_sysctl_table *t;
    480	int i;
    481
    482	t = kmemdup(&parport_sysctl_template, sizeof(*t), GFP_KERNEL);
    483	if (t == NULL)
    484		return -ENOMEM;
    485
    486	t->device_dir[0].extra1 = port;
    487
    488	for (i = 0; i < 5; i++)
    489		t->vars[i].extra1 = port;
    490
    491	t->vars[0].data = &port->spintime;
    492	t->vars[5].child = t->device_dir;
    493	
    494	for (i = 0; i < 5; i++)
    495		t->vars[6 + i].extra2 = &port->probe_info[i];
    496
    497	t->port_dir[0].procname = port->name;
    498
    499	t->port_dir[0].child = t->vars;
    500	t->parport_dir[0].child = t->port_dir;
    501	t->dev_dir[0].child = t->parport_dir;
    502
    503	t->sysctl_header = register_sysctl_table(t->dev_dir);
    504	if (t->sysctl_header == NULL) {
    505		kfree(t);
    506		t = NULL;
    507	}
    508	port->sysctl_table = t;
    509	return 0;
    510}
    511
    512int parport_proc_unregister(struct parport *port)
    513{
    514	if (port->sysctl_table) {
    515		struct parport_sysctl_table *t = port->sysctl_table;
    516		port->sysctl_table = NULL;
    517		unregister_sysctl_table(t->sysctl_header);
    518		kfree(t);
    519	}
    520	return 0;
    521}
    522
    523int parport_device_proc_register(struct pardevice *device)
    524{
    525	struct parport_device_sysctl_table *t;
    526	struct parport * port = device->port;
    527	
    528	t = kmemdup(&parport_device_sysctl_template, sizeof(*t), GFP_KERNEL);
    529	if (t == NULL)
    530		return -ENOMEM;
    531
    532	t->dev_dir[0].child = t->parport_dir;
    533	t->parport_dir[0].child = t->port_dir;
    534	t->port_dir[0].procname = port->name;
    535	t->port_dir[0].child = t->devices_root_dir;
    536	t->devices_root_dir[0].child = t->device_dir;
    537
    538	t->device_dir[0].procname = device->name;
    539	t->device_dir[0].child = t->vars;
    540	t->vars[0].data = &device->timeslice;
    541
    542	t->sysctl_header = register_sysctl_table(t->dev_dir);
    543	if (t->sysctl_header == NULL) {
    544		kfree(t);
    545		t = NULL;
    546	}
    547	device->sysctl_table = t;
    548	return 0;
    549}
    550
    551int parport_device_proc_unregister(struct pardevice *device)
    552{
    553	if (device->sysctl_table) {
    554		struct parport_device_sysctl_table *t = device->sysctl_table;
    555		device->sysctl_table = NULL;
    556		unregister_sysctl_table(t->sysctl_header);
    557		kfree(t);
    558	}
    559	return 0;
    560}
    561
    562static int __init parport_default_proc_register(void)
    563{
    564	int ret;
    565
    566	parport_default_sysctl_table.sysctl_header =
    567		register_sysctl_table(parport_default_sysctl_table.dev_dir);
    568	if (!parport_default_sysctl_table.sysctl_header)
    569		return -ENOMEM;
    570	ret = parport_bus_init();
    571	if (ret) {
    572		unregister_sysctl_table(parport_default_sysctl_table.
    573					sysctl_header);
    574		return ret;
    575	}
    576	return 0;
    577}
    578
    579static void __exit parport_default_proc_unregister(void)
    580{
    581	if (parport_default_sysctl_table.sysctl_header) {
    582		unregister_sysctl_table(parport_default_sysctl_table.
    583					sysctl_header);
    584		parport_default_sysctl_table.sysctl_header = NULL;
    585	}
    586	parport_bus_exit();
    587}
    588
    589#else /* no sysctl or no procfs*/
    590
    591int parport_proc_register(struct parport *pp)
    592{
    593	return 0;
    594}
    595
    596int parport_proc_unregister(struct parport *pp)
    597{
    598	return 0;
    599}
    600
    601int parport_device_proc_register(struct pardevice *device)
    602{
    603	return 0;
    604}
    605
    606int parport_device_proc_unregister(struct pardevice *device)
    607{
    608	return 0;
    609}
    610
    611static int __init parport_default_proc_register (void)
    612{
    613	return parport_bus_init();
    614}
    615
    616static void __exit parport_default_proc_unregister (void)
    617{
    618	parport_bus_exit();
    619}
    620#endif
    621
    622subsys_initcall(parport_default_proc_register)
    623module_exit(parport_default_proc_unregister)