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brintos / linux-shallow public Read only

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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * RapidIO sysfs attributes and support4 *5 * Copyright 2005 MontaVista Software, Inc.6 * Matt Porter <mporter@kernel.crashing.org>7 */8 9#include <linux/kernel.h>10#include <linux/rio.h>11#include <linux/rio_drv.h>12#include <linux/stat.h>13#include <linux/capability.h>14 15#include "rio.h"16 17/* Sysfs support */18#define rio_config_attr(field, format_string)					\19static ssize_t								\20field##_show(struct device *dev, struct device_attribute *attr, char *buf)			\21{									\22	struct rio_dev *rdev = to_rio_dev(dev);				\23									\24	return sprintf(buf, format_string, rdev->field);		\25}									\26static DEVICE_ATTR_RO(field);27 28rio_config_attr(did, "0x%04x\n");29rio_config_attr(vid, "0x%04x\n");30rio_config_attr(device_rev, "0x%08x\n");31rio_config_attr(asm_did, "0x%04x\n");32rio_config_attr(asm_vid, "0x%04x\n");33rio_config_attr(asm_rev, "0x%04x\n");34rio_config_attr(destid, "0x%04x\n");35rio_config_attr(hopcount, "0x%02x\n");36 37static ssize_t routes_show(struct device *dev, struct device_attribute *attr, char *buf)38{39	struct rio_dev *rdev = to_rio_dev(dev);40	char *str = buf;41	int i;42 43	for (i = 0; i < RIO_MAX_ROUTE_ENTRIES(rdev->net->hport->sys_size);44			i++) {45		if (rdev->rswitch->route_table[i] == RIO_INVALID_ROUTE)46			continue;47		str +=48		    sprintf(str, "%04x %02x\n", i,49			    rdev->rswitch->route_table[i]);50	}51 52	return (str - buf);53}54static DEVICE_ATTR_RO(routes);55 56static ssize_t lprev_show(struct device *dev,57			  struct device_attribute *attr, char *buf)58{59	struct rio_dev *rdev = to_rio_dev(dev);60 61	return sprintf(buf, "%s\n",62			(rdev->prev) ? rio_name(rdev->prev) : "root");63}64static DEVICE_ATTR_RO(lprev);65 66static ssize_t lnext_show(struct device *dev,67			  struct device_attribute *attr, char *buf)68{69	struct rio_dev *rdev = to_rio_dev(dev);70	char *str = buf;71	int i;72 73	if (rdev->pef & RIO_PEF_SWITCH) {74		for (i = 0; i < RIO_GET_TOTAL_PORTS(rdev->swpinfo); i++) {75			if (rdev->rswitch->nextdev[i])76				str += sprintf(str, "%s\n",77					rio_name(rdev->rswitch->nextdev[i]));78			else79				str += sprintf(str, "null\n");80		}81	}82 83	return str - buf;84}85static DEVICE_ATTR_RO(lnext);86 87static ssize_t modalias_show(struct device *dev,88			     struct device_attribute *attr, char *buf)89{90	struct rio_dev *rdev = to_rio_dev(dev);91 92	return sprintf(buf, "rapidio:v%04Xd%04Xav%04Xad%04X\n",93		       rdev->vid, rdev->did, rdev->asm_vid, rdev->asm_did);94}95static DEVICE_ATTR_RO(modalias);96 97static struct attribute *rio_dev_attrs[] = {98	&dev_attr_did.attr,99	&dev_attr_vid.attr,100	&dev_attr_device_rev.attr,101	&dev_attr_asm_did.attr,102	&dev_attr_asm_vid.attr,103	&dev_attr_asm_rev.attr,104	&dev_attr_lprev.attr,105	&dev_attr_destid.attr,106	&dev_attr_modalias.attr,107 108	/* Switch-only attributes */109	&dev_attr_routes.attr,110	&dev_attr_lnext.attr,111	&dev_attr_hopcount.attr,112	NULL,113};114 115static ssize_t116rio_read_config(struct file *filp, struct kobject *kobj,117		struct bin_attribute *bin_attr,118		char *buf, loff_t off, size_t count)119{120	struct rio_dev *dev = to_rio_dev(kobj_to_dev(kobj));121	unsigned int size = 0x100;122	loff_t init_off = off;123	u8 *data = (u8 *) buf;124 125	/* Several chips lock up trying to read undefined config space */126	if (capable(CAP_SYS_ADMIN))127		size = RIO_MAINT_SPACE_SZ;128 129	if (off >= size)130		return 0;131	if (off + count > size) {132		size -= off;133		count = size;134	} else {135		size = count;136	}137 138	if ((off & 1) && size) {139		u8 val;140		rio_read_config_8(dev, off, &val);141		data[off - init_off] = val;142		off++;143		size--;144	}145 146	if ((off & 3) && size > 2) {147		u16 val;148		rio_read_config_16(dev, off, &val);149		data[off - init_off] = (val >> 8) & 0xff;150		data[off - init_off + 1] = val & 0xff;151		off += 2;152		size -= 2;153	}154 155	while (size > 3) {156		u32 val;157		rio_read_config_32(dev, off, &val);158		data[off - init_off] = (val >> 24) & 0xff;159		data[off - init_off + 1] = (val >> 16) & 0xff;160		data[off - init_off + 2] = (val >> 8) & 0xff;161		data[off - init_off + 3] = val & 0xff;162		off += 4;163		size -= 4;164	}165 166	if (size >= 2) {167		u16 val;168		rio_read_config_16(dev, off, &val);169		data[off - init_off] = (val >> 8) & 0xff;170		data[off - init_off + 1] = val & 0xff;171		off += 2;172		size -= 2;173	}174 175	if (size > 0) {176		u8 val;177		rio_read_config_8(dev, off, &val);178		data[off - init_off] = val;179		off++;180		--size;181	}182 183	return count;184}185 186static ssize_t187rio_write_config(struct file *filp, struct kobject *kobj,188		 struct bin_attribute *bin_attr,189		 char *buf, loff_t off, size_t count)190{191	struct rio_dev *dev = to_rio_dev(kobj_to_dev(kobj));192	unsigned int size = count;193	loff_t init_off = off;194	u8 *data = (u8 *) buf;195 196	if (off >= RIO_MAINT_SPACE_SZ)197		return 0;198	if (off + count > RIO_MAINT_SPACE_SZ) {199		size = RIO_MAINT_SPACE_SZ - off;200		count = size;201	}202 203	if ((off & 1) && size) {204		rio_write_config_8(dev, off, data[off - init_off]);205		off++;206		size--;207	}208 209	if ((off & 3) && (size > 2)) {210		u16 val = data[off - init_off + 1];211		val |= (u16) data[off - init_off] << 8;212		rio_write_config_16(dev, off, val);213		off += 2;214		size -= 2;215	}216 217	while (size > 3) {218		u32 val = data[off - init_off + 3];219		val |= (u32) data[off - init_off + 2] << 8;220		val |= (u32) data[off - init_off + 1] << 16;221		val |= (u32) data[off - init_off] << 24;222		rio_write_config_32(dev, off, val);223		off += 4;224		size -= 4;225	}226 227	if (size >= 2) {228		u16 val = data[off - init_off + 1];229		val |= (u16) data[off - init_off] << 8;230		rio_write_config_16(dev, off, val);231		off += 2;232		size -= 2;233	}234 235	if (size) {236		rio_write_config_8(dev, off, data[off - init_off]);237		off++;238		--size;239	}240 241	return count;242}243 244static struct bin_attribute rio_config_attr = {245	.attr = {246		 .name = "config",247		 .mode = S_IRUGO | S_IWUSR,248		 },249	.size = RIO_MAINT_SPACE_SZ,250	.read = rio_read_config,251	.write = rio_write_config,252};253 254static struct bin_attribute *rio_dev_bin_attrs[] = {255	&rio_config_attr,256	NULL,257};258 259static umode_t rio_dev_is_attr_visible(struct kobject *kobj,260				       struct attribute *attr, int n)261{262	struct rio_dev *rdev = to_rio_dev(kobj_to_dev(kobj));263	umode_t mode = attr->mode;264 265	if (!(rdev->pef & RIO_PEF_SWITCH) &&266	    (attr == &dev_attr_routes.attr ||267	     attr == &dev_attr_lnext.attr ||268	     attr == &dev_attr_hopcount.attr)) {269		/*270		 * Hide switch-specific attributes for a non-switch device.271		 */272		mode = 0;273	}274 275	return mode;276}277 278static const struct attribute_group rio_dev_group = {279	.attrs		= rio_dev_attrs,280	.is_visible	= rio_dev_is_attr_visible,281	.bin_attrs	= rio_dev_bin_attrs,282};283 284const struct attribute_group *rio_dev_groups[] = {285	&rio_dev_group,286	NULL,287};288 289static ssize_t scan_store(const struct bus_type *bus, const char *buf, size_t count)290{291	long val;292	int rc;293 294	if (kstrtol(buf, 0, &val) < 0)295		return -EINVAL;296 297	if (val == RIO_MPORT_ANY) {298		rc = rio_init_mports();299		goto exit;300	}301 302	if (val < 0 || val >= RIO_MAX_MPORTS)303		return -EINVAL;304 305	rc = rio_mport_scan((int)val);306exit:307	if (!rc)308		rc = count;309 310	return rc;311}312static BUS_ATTR_WO(scan);313 314static struct attribute *rio_bus_attrs[] = {315	&bus_attr_scan.attr,316	NULL,317};318 319static const struct attribute_group rio_bus_group = {320	.attrs = rio_bus_attrs,321};322 323const struct attribute_group *rio_bus_groups[] = {324	&rio_bus_group,325	NULL,326};327 328static ssize_t329port_destid_show(struct device *dev, struct device_attribute *attr,330		 char *buf)331{332	struct rio_mport *mport = to_rio_mport(dev);333 334	if (mport)335		return sprintf(buf, "0x%04x\n", mport->host_deviceid);336	else337		return -ENODEV;338}339static DEVICE_ATTR_RO(port_destid);340 341static ssize_t sys_size_show(struct device *dev, struct device_attribute *attr,342			   char *buf)343{344	struct rio_mport *mport = to_rio_mport(dev);345 346	if (mport)347		return sprintf(buf, "%u\n", mport->sys_size);348	else349		return -ENODEV;350}351static DEVICE_ATTR_RO(sys_size);352 353static struct attribute *rio_mport_attrs[] = {354	&dev_attr_port_destid.attr,355	&dev_attr_sys_size.attr,356	NULL,357};358 359static const struct attribute_group rio_mport_group = {360	.attrs = rio_mport_attrs,361};362 363const struct attribute_group *rio_mport_groups[] = {364	&rio_mport_group,365	NULL,366};367