| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Matthew Wilcox | 2179 | 55.22% | 1 | 3.33% |
| Thibaut Varene | 1398 | 35.43% | 4 | 13.33% |
| Greg Kroah-Hartman | 248 | 6.28% | 7 | 23.33% |
| Helge Deller | 43 | 1.09% | 2 | 6.67% |
| Kyle McMartin | 25 | 0.63% | 3 | 10.00% |
| James Bottomley | 16 | 0.41% | 1 | 3.33% |
| Rickard Strandqvist | 13 | 0.33% | 1 | 3.33% |
| Roel Kluin | 4 | 0.10% | 1 | 3.33% |
| Randy Dunlap | 3 | 0.08% | 1 | 3.33% |
| Joel Soete | 3 | 0.08% | 1 | 3.33% |
| Julia Lawall | 3 | 0.08% | 1 | 3.33% |
| Randolph Chung | 3 | 0.08% | 1 | 3.33% |
| André Goddard Rosa | 2 | 0.05% | 1 | 3.33% |
| Lucas De Marchi | 2 | 0.05% | 1 | 3.33% |
| Tejun Heo | 1 | 0.03% | 1 | 3.33% |
| Linus Torvalds | 1 | 0.03% | 1 | 3.33% |
| Emese Revfy | 1 | 0.03% | 1 | 3.33% |
| Arvind Yadav | 1 | 0.03% | 1 | 3.33% |
| Total | 3946 | 30 |
/* * Interfaces to retrieve and set PDC Stable options (firmware) * * Copyright (C) 2005-2006 Thibaut VARENE <varenet@parisc-linux.org> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License, version 2, as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * * DEV NOTE: the PDC Procedures reference states that: * "A minimum of 96 bytes of Stable Storage is required. Providing more than * 96 bytes of Stable Storage is optional [...]. Failure to provide the * optional locations from 96 to 192 results in the loss of certain * functionality during boot." * * Since locations between 96 and 192 are the various paths, most (if not * all) PA-RISC machines should have them. Anyway, for safety reasons, the * following code can deal with just 96 bytes of Stable Storage, and all * sizes between 96 and 192 bytes (provided they are multiple of struct * device_path size, eg: 128, 160 and 192) to provide full information. * One last word: there's one path we can always count on: the primary path. * Anything above 224 bytes is used for 'osdep2' OS-dependent storage area. * * The first OS-dependent area should always be available. Obviously, this is * not true for the other one. Also bear in mind that reading/writing from/to * osdep2 is much more expensive than from/to osdep1. * NOTE: We do not handle the 2 bytes OS-dep area at 0x5D, nor the first * 2 bytes of storage available right after OSID. That's a total of 4 bytes * sacrificed: -ETOOLAZY :P * * The current policy wrt file permissions is: * - write: root only * - read: (reading triggers PDC calls) ? root only : everyone * The rationale is that PDC calls could hog (DoS) the machine. * * TODO: * - timer/fastsize write calls */ #undef PDCS_DEBUG #ifdef PDCS_DEBUG #define DPRINTK(fmt, args...) printk(KERN_DEBUG fmt, ## args) #else #define DPRINTK(fmt, args...) #endif #include <linux/module.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/string.h> #include <linux/capability.h> #include <linux/ctype.h> #include <linux/sysfs.h> #include <linux/kobject.h> #include <linux/device.h> #include <linux/errno.h> #include <linux/spinlock.h> #include <asm/pdc.h> #include <asm/page.h> #include <linux/uaccess.h> #include <asm/hardware.h> #define PDCS_VERSION "0.30" #define PDCS_PREFIX "PDC Stable Storage" #define PDCS_ADDR_PPRI 0x00 #define PDCS_ADDR_OSID 0x40 #define PDCS_ADDR_OSD1 0x48 #define PDCS_ADDR_DIAG 0x58 #define PDCS_ADDR_FSIZ 0x5C #define PDCS_ADDR_PCON 0x60 #define PDCS_ADDR_PALT 0x80 #define PDCS_ADDR_PKBD 0xA0 #define PDCS_ADDR_OSD2 0xE0 MODULE_AUTHOR("Thibaut VARENE <varenet@parisc-linux.org>"); MODULE_DESCRIPTION("sysfs interface to HP PDC Stable Storage data"); MODULE_LICENSE("GPL"); MODULE_VERSION(PDCS_VERSION); /* holds Stable Storage size. Initialized once and for all, no lock needed */ static unsigned long pdcs_size __read_mostly; /* holds OS ID. Initialized once and for all, hopefully to 0x0006 */ static u16 pdcs_osid __read_mostly; /* This struct defines what we need to deal with a parisc pdc path entry */ struct pdcspath_entry { rwlock_t rw_lock; /* to protect path entry access */ short ready; /* entry record is valid if != 0 */ unsigned long addr; /* entry address in stable storage */ char *name; /* entry name */ struct device_path devpath; /* device path in parisc representation */ struct device *dev; /* corresponding device */ struct kobject kobj; }; struct pdcspath_attribute { struct attribute attr; ssize_t (*show)(struct pdcspath_entry *entry, char *buf); ssize_t (*store)(struct pdcspath_entry *entry, const char *buf, size_t count); }; #define PDCSPATH_ENTRY(_addr, _name) \ struct pdcspath_entry pdcspath_entry_##_name = { \ .ready = 0, \ .addr = _addr, \ .name = __stringify(_name), \ }; #define PDCS_ATTR(_name, _mode, _show, _store) \ struct kobj_attribute pdcs_attr_##_name = { \ .attr = {.name = __stringify(_name), .mode = _mode}, \ .show = _show, \ .store = _store, \ }; #define PATHS_ATTR(_name, _mode, _show, _store) \ struct pdcspath_attribute paths_attr_##_name = { \ .attr = {.name = __stringify(_name), .mode = _mode}, \ .show = _show, \ .store = _store, \ }; #define to_pdcspath_attribute(_attr) container_of(_attr, struct pdcspath_attribute, attr) #define to_pdcspath_entry(obj) container_of(obj, struct pdcspath_entry, kobj) /** * pdcspath_fetch - This function populates the path entry structs. * @entry: A pointer to an allocated pdcspath_entry. * * The general idea is that you don't read from the Stable Storage every time * you access the files provided by the facilities. We store a copy of the * content of the stable storage WRT various paths in these structs. We read * these structs when reading the files, and we will write to these structs when * writing to the files, and only then write them back to the Stable Storage. * * This function expects to be called with @entry->rw_lock write-hold. */ static int pdcspath_fetch(struct pdcspath_entry *entry) { struct device_path *devpath; if (!entry) return -EINVAL; devpath = &entry->devpath; DPRINTK("%s: fetch: 0x%p, 0x%p, addr: 0x%lx\n", __func__, entry, devpath, entry->addr); /* addr, devpath and count must be word aligned */ if (pdc_stable_read(entry->addr, devpath, sizeof(*devpath)) != PDC_OK) return -EIO; /* Find the matching device. NOTE: hardware_path overlays with device_path, so the nice cast can be used */ entry->dev = hwpath_to_device((struct hardware_path *)devpath); entry->ready = 1; DPRINTK("%s: device: 0x%p\n", __func__, entry->dev); return 0; } /** * pdcspath_store - This function writes a path to stable storage. * @entry: A pointer to an allocated pdcspath_entry. * * It can be used in two ways: either by passing it a preset devpath struct * containing an already computed hardware path, or by passing it a device * pointer, from which it'll find out the corresponding hardware path. * For now we do not handle the case where there's an error in writing to the * Stable Storage area, so you'd better not mess up the data :P * * This function expects to be called with @entry->rw_lock write-hold. */ static void pdcspath_store(struct pdcspath_entry *entry) { struct device_path *devpath; BUG_ON(!entry); devpath = &entry->devpath; /* We expect the caller to set the ready flag to 0 if the hardware path struct provided is invalid, so that we know we have to fill it. First case, we don't have a preset hwpath... */ if (!entry->ready) { /* ...but we have a device, map it */ BUG_ON(!entry->dev); device_to_hwpath(entry->dev, (struct hardware_path *)devpath); } /* else, we expect the provided hwpath to be valid. */ DPRINTK("%s: store: 0x%p, 0x%p, addr: 0x%lx\n", __func__, entry, devpath, entry->addr); /* addr, devpath and count must be word aligned */ if (pdc_stable_write(entry->addr, devpath, sizeof(*devpath)) != PDC_OK) WARN(1, KERN_ERR "%s: an error occurred when writing to PDC.\n" "It is likely that the Stable Storage data has been corrupted.\n" "Please check it carefully upon next reboot.\n", __func__); /* kobject is already registered */ entry->ready = 2; DPRINTK("%s: device: 0x%p\n", __func__, entry->dev); } /** * pdcspath_hwpath_read - This function handles hardware path pretty printing. * @entry: An allocated and populated pdscpath_entry struct. * @buf: The output buffer to write to. * * We will call this function to format the output of the hwpath attribute file. */ static ssize_t pdcspath_hwpath_read(struct pdcspath_entry *entry, char *buf) { char *out = buf; struct device_path *devpath; short i; if (!entry || !buf) return -EINVAL; read_lock(&entry->rw_lock); devpath = &entry->devpath; i = entry->ready; read_unlock(&entry->rw_lock); if (!i) /* entry is not ready */ return -ENODATA; for (i = 0; i < 6; i++) { if (devpath->bc[i] >= 128) continue; out += sprintf(out, "%u/", (unsigned char)devpath->bc[i]); } out += sprintf(out, "%u\n", (unsigned char)devpath->mod); return out - buf; } /** * pdcspath_hwpath_write - This function handles hardware path modifying. * @entry: An allocated and populated pdscpath_entry struct. * @buf: The input buffer to read from. * @count: The number of bytes to be read. * * We will call this function to change the current hardware path. * Hardware paths are to be given '/'-delimited, without brackets. * We make sure that the provided path actually maps to an existing * device, BUT nothing would prevent some foolish user to set the path to some * PCI bridge or even a CPU... * A better work around would be to make sure we are at the end of a device tree * for instance, but it would be IMHO beyond the simple scope of that driver. * The aim is to provide a facility. Data correctness is left to userland. */ static ssize_t pdcspath_hwpath_write(struct pdcspath_entry *entry, const char *buf, size_t count) { struct hardware_path hwpath; unsigned short i; char in[64], *temp; struct device *dev; int ret; if (!entry || !buf || !count) return -EINVAL; /* We'll use a local copy of buf */ count = min_t(size_t, count, sizeof(in)-1); strncpy(in, buf, count); in[count] = '\0'; /* Let's clean up the target. 0xff is a blank pattern */ memset(&hwpath, 0xff, sizeof(hwpath)); /* First, pick the mod field (the last one of the input string) */ if (!(temp = strrchr(in, '/'))) return -EINVAL; hwpath.mod = simple_strtoul(temp+1, NULL, 10); in[temp-in] = '\0'; /* truncate the remaining string. just precaution */ DPRINTK("%s: mod: %d\n", __func__, hwpath.mod); /* Then, loop for each delimiter, making sure we don't have too many. we write the bc fields in a down-top way. No matter what, we stop before writing the last field. If there are too many fields anyway, then the user is a moron and it'll be caught up later when we'll check the consistency of the given hwpath. */ for (i=5; ((temp = strrchr(in, '/'))) && (temp-in > 0) && (likely(i)); i--) { hwpath.bc[i] = simple_strtoul(temp+1, NULL, 10); in[temp-in] = '\0'; DPRINTK("%s: bc[%d]: %d\n", __func__, i, hwpath.bc[i]); } /* Store the final field */ hwpath.bc[i] = simple_strtoul(in, NULL, 10); DPRINTK("%s: bc[%d]: %d\n", __func__, i, hwpath.bc[i]); /* Now we check that the user isn't trying to lure us */ if (!(dev = hwpath_to_device((struct hardware_path *)&hwpath))) { printk(KERN_WARNING "%s: attempt to set invalid \"%s\" " "hardware path: %s\n", __func__, entry->name, buf); return -EINVAL; } /* So far so good, let's get in deep */ write_lock(&entry->rw_lock); entry->ready = 0; entry->dev = dev; /* Now, dive in. Write back to the hardware */ pdcspath_store(entry); /* Update the symlink to the real device */ sysfs_remove_link(&entry->kobj, "device"); write_unlock(&entry->rw_lock); ret = sysfs_create_link(&entry->kobj, &entry->dev->kobj, "device"); WARN_ON(ret); printk(KERN_INFO PDCS_PREFIX ": changed \"%s\" path to \"%s\"\n", entry->name, buf); return count; } /** * pdcspath_layer_read - Extended layer (eg. SCSI ids) pretty printing. * @entry: An allocated and populated pdscpath_entry struct. * @buf: The output buffer to write to. * * We will call this function to format the output of the layer attribute file. */ static ssize_t pdcspath_layer_read(struct pdcspath_entry *entry, char *buf) { char *out = buf; struct device_path *devpath; short i; if (!entry || !buf) return -EINVAL; read_lock(&entry->rw_lock); devpath = &entry->devpath; i = entry->ready; read_unlock(&entry->rw_lock); if (!i) /* entry is not ready */ return -ENODATA; for (i = 0; i < 6 && devpath->layers[i]; i++) out += sprintf(out, "%u ", devpath->layers[i]); out += sprintf(out, "\n"); return out - buf; } /** * pdcspath_layer_write - This function handles extended layer modifying. * @entry: An allocated and populated pdscpath_entry struct. * @buf: The input buffer to read from. * @count: The number of bytes to be read. * * We will call this function to change the current layer value. * Layers are to be given '.'-delimited, without brackets. * XXX beware we are far less checky WRT input data provided than for hwpath. * Potential harm can be done, since there's no way to check the validity of * the layer fields. */ static ssize_t pdcspath_layer_write(struct pdcspath_entry *entry, const char *buf, size_t count) { unsigned int layers[6]; /* device-specific info (ctlr#, unit#, ...) */ unsigned short i; char in[64], *temp; if (!entry || !buf || !count) return -EINVAL; /* We'll use a local copy of buf */ count = min_t(size_t, count, sizeof(in)-1); strncpy(in, buf, count); in[count] = '\0'; /* Let's clean up the target. 0 is a blank pattern */ memset(&layers, 0, sizeof(layers)); /* First, pick the first layer */ if (unlikely(!isdigit(*in))) return -EINVAL; layers[0] = simple_strtoul(in, NULL, 10); DPRINTK("%s: layer[0]: %d\n", __func__, layers[0]); temp = in; for (i=1; ((temp = strchr(temp, '.'))) && (likely(i<6)); i++) { if (unlikely(!isdigit(*(++temp)))) return -EINVAL; layers[i] = simple_strtoul(temp, NULL, 10); DPRINTK("%s: layer[%d]: %d\n", __func__, i, layers[i]); } /* So far so good, let's get in deep */ write_lock(&entry->rw_lock); /* First, overwrite the current layers with the new ones, not touching the hardware path. */ memcpy(&entry->devpath.layers, &layers, sizeof(layers)); /* Now, dive in. Write back to the hardware */ pdcspath_store(entry); write_unlock(&entry->rw_lock); printk(KERN_INFO PDCS_PREFIX ": changed \"%s\" layers to \"%s\"\n", entry->name, buf); return count; } /** * pdcspath_attr_show - Generic read function call wrapper. * @kobj: The kobject to get info from. * @attr: The attribute looked upon. * @buf: The output buffer. */ static ssize_t pdcspath_attr_show(struct kobject *kobj, struct attribute *attr, char *buf) { struct pdcspath_entry *entry = to_pdcspath_entry(kobj); struct pdcspath_attribute *pdcs_attr = to_pdcspath_attribute(attr); ssize_t ret = 0; if (pdcs_attr->show) ret = pdcs_attr->show(entry, buf); return ret; } /** * pdcspath_attr_store - Generic write function call wrapper. * @kobj: The kobject to write info to. * @attr: The attribute to be modified. * @buf: The input buffer. * @count: The size of the buffer. */ static ssize_t pdcspath_attr_store(struct kobject *kobj, struct attribute *attr, const char *buf, size_t count) { struct pdcspath_entry *entry = to_pdcspath_entry(kobj); struct pdcspath_attribute *pdcs_attr = to_pdcspath_attribute(attr); ssize_t ret = 0; if (!capable(CAP_SYS_ADMIN)) return -EACCES; if (pdcs_attr->store) ret = pdcs_attr->store(entry, buf, count); return ret; } static const struct sysfs_ops pdcspath_attr_ops = { .show = pdcspath_attr_show, .store = pdcspath_attr_store, }; /* These are the two attributes of any PDC path. */ static PATHS_ATTR(hwpath, 0644, pdcspath_hwpath_read, pdcspath_hwpath_write); static PATHS_ATTR(layer, 0644, pdcspath_layer_read, pdcspath_layer_write); static struct attribute *paths_subsys_attrs[] = { &paths_attr_hwpath.attr, &paths_attr_layer.attr, NULL, }; /* Specific kobject type for our PDC paths */ static struct kobj_type ktype_pdcspath = { .sysfs_ops = &pdcspath_attr_ops, .default_attrs = paths_subsys_attrs, }; /* We hard define the 4 types of path we expect to find */ static PDCSPATH_ENTRY(PDCS_ADDR_PPRI, primary); static PDCSPATH_ENTRY(PDCS_ADDR_PCON, console); static PDCSPATH_ENTRY(PDCS_ADDR_PALT, alternative); static PDCSPATH_ENTRY(PDCS_ADDR_PKBD, keyboard); /* An array containing all PDC paths we will deal with */ static struct pdcspath_entry *pdcspath_entries[] = { &pdcspath_entry_primary, &pdcspath_entry_alternative, &pdcspath_entry_console, &pdcspath_entry_keyboard, NULL, }; /* For more insight of what's going on here, refer to PDC Procedures doc, * Section PDC_STABLE */ /** * pdcs_size_read - Stable Storage size output. * @buf: The output buffer to write to. */ static ssize_t pdcs_size_read(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { char *out = buf; if (!buf) return -EINVAL; /* show the size of the stable storage */ out += sprintf(out, "%ld\n", pdcs_size); return out - buf; } /** * pdcs_auto_read - Stable Storage autoboot/search flag output. * @buf: The output buffer to write to. * @knob: The PF_AUTOBOOT or PF_AUTOSEARCH flag */ static ssize_t pdcs_auto_read(struct kobject *kobj, struct kobj_attribute *attr, char *buf, int knob) { char *out = buf; struct pdcspath_entry *pathentry; if (!buf) return -EINVAL; /* Current flags are stored in primary boot path entry */ pathentry = &pdcspath_entry_primary; read_lock(&pathentry->rw_lock); out += sprintf(out, "%s\n", (pathentry->devpath.flags & knob) ? "On" : "Off"); read_unlock(&pathentry->rw_lock); return out - buf; } /** * pdcs_autoboot_read - Stable Storage autoboot flag output. * @buf: The output buffer to write to. */ static ssize_t pdcs_autoboot_read(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { return pdcs_auto_read(kobj, attr, buf, PF_AUTOBOOT); } /** * pdcs_autosearch_read - Stable Storage autoboot flag output. * @buf: The output buffer to write to. */ static ssize_t pdcs_autosearch_read(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { return pdcs_auto_read(kobj, attr, buf, PF_AUTOSEARCH); } /** * pdcs_timer_read - Stable Storage timer count output (in seconds). * @buf: The output buffer to write to. * * The value of the timer field correponds to a number of seconds in powers of 2. */ static ssize_t pdcs_timer_read(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { char *out = buf; struct pdcspath_entry *pathentry; if (!buf) return -EINVAL; /* Current flags are stored in primary boot path entry */ pathentry = &pdcspath_entry_primary; /* print the timer value in seconds */ read_lock(&pathentry->rw_lock); out += sprintf(out, "%u\n", (pathentry->devpath.flags & PF_TIMER) ? (1 << (pathentry->devpath.flags & PF_TIMER)) : 0); read_unlock(&pathentry->rw_lock); return out - buf; } /** * pdcs_osid_read - Stable Storage OS ID register output. * @buf: The output buffer to write to. */ static ssize_t pdcs_osid_read(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { char *out = buf; if (!buf) return -EINVAL; out += sprintf(out, "%s dependent data (0x%.4x)\n", os_id_to_string(pdcs_osid), pdcs_osid); return out - buf; } /** * pdcs_osdep1_read - Stable Storage OS-Dependent data area 1 output. * @buf: The output buffer to write to. * * This can hold 16 bytes of OS-Dependent data. */ static ssize_t pdcs_osdep1_read(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { char *out = buf; u32 result[4]; if (!buf) return -EINVAL; if (pdc_stable_read(PDCS_ADDR_OSD1, &result, sizeof(result)) != PDC_OK) return -EIO; out += sprintf(out, "0x%.8x\n", result[0]); out += sprintf(out, "0x%.8x\n", result[1]); out += sprintf(out, "0x%.8x\n", result[2]); out += sprintf(out, "0x%.8x\n", result[3]); return out - buf; } /** * pdcs_diagnostic_read - Stable Storage Diagnostic register output. * @buf: The output buffer to write to. * * I have NFC how to interpret the content of that register ;-). */ static ssize_t pdcs_diagnostic_read(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { char *out = buf; u32 result; if (!buf) return -EINVAL; /* get diagnostic */ if (pdc_stable_read(PDCS_ADDR_DIAG, &result, sizeof(result)) != PDC_OK) return -EIO; out += sprintf(out, "0x%.4x\n", (result >> 16)); return out - buf; } /** * pdcs_fastsize_read - Stable Storage FastSize register output. * @buf: The output buffer to write to. * * This register holds the amount of system RAM to be tested during boot sequence. */ static ssize_t pdcs_fastsize_read(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { char *out = buf; u32 result; if (!buf) return -EINVAL; /* get fast-size */ if (pdc_stable_read(PDCS_ADDR_FSIZ, &result, sizeof(result)) != PDC_OK) return -EIO; if ((result & 0x0F) < 0x0E) out += sprintf(out, "%d kB", (1<<(result & 0x0F))*256); else out += sprintf(out, "All"); out += sprintf(out, "\n"); return out - buf; } /** * pdcs_osdep2_read - Stable Storage OS-Dependent data area 2 output. * @buf: The output buffer to write to. * * This can hold pdcs_size - 224 bytes of OS-Dependent data, when available. */ static ssize_t pdcs_osdep2_read(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { char *out = buf; unsigned long size; unsigned short i; u32 result; if (unlikely(pdcs_size <= 224)) return -ENODATA; size = pdcs_size - 224; if (!buf) return -EINVAL; for (i=0; i<size; i+=4) { if (unlikely(pdc_stable_read(PDCS_ADDR_OSD2 + i, &result, sizeof(result)) != PDC_OK)) return -EIO; out += sprintf(out, "0x%.8x\n", result); } return out - buf; } /** * pdcs_auto_write - This function handles autoboot/search flag modifying. * @buf: The input buffer to read from. * @count: The number of bytes to be read. * @knob: The PF_AUTOBOOT or PF_AUTOSEARCH flag * * We will call this function to change the current autoboot flag. * We expect a precise syntax: * \"n\" (n == 0 or 1) to toggle AutoBoot Off or On */ static ssize_t pdcs_auto_write(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count, int knob) { struct pdcspath_entry *pathentry; unsigned char flags; char in[8], *temp; char c; if (!capable(CAP_SYS_ADMIN)) return -EACCES; if (!buf || !count) return -EINVAL; /* We'll use a local copy of buf */ count = min_t(size_t, count, sizeof(in)-1); strncpy(in, buf, count); in[count] = '\0'; /* Current flags are stored in primary boot path entry */ pathentry = &pdcspath_entry_primary; /* Be nice to the existing flag record */ read_lock(&pathentry->rw_lock); flags = pathentry->devpath.flags; read_unlock(&pathentry->rw_lock); DPRINTK("%s: flags before: 0x%X\n", __func__, flags); temp = skip_spaces(in); c = *temp++ - '0'; if ((c != 0) && (c != 1)) goto parse_error; if (c == 0) flags &= ~knob; else flags |= knob; DPRINTK("%s: flags after: 0x%X\n", __func__, flags); /* So far so good, let's get in deep */ write_lock(&pathentry->rw_lock); /* Change the path entry flags first */ pathentry->devpath.flags = flags; /* Now, dive in. Write back to the hardware */ pdcspath_store(pathentry); write_unlock(&pathentry->rw_lock); printk(KERN_INFO PDCS_PREFIX ": changed \"%s\" to \"%s\"\n", (knob & PF_AUTOBOOT) ? "autoboot" : "autosearch", (flags & knob) ? "On" : "Off"); return count; parse_error: printk(KERN_WARNING "%s: Parse error: expect \"n\" (n == 0 or 1)\n", __func__); return -EINVAL; } /** * pdcs_autoboot_write - This function handles autoboot flag modifying. * @buf: The input buffer to read from. * @count: The number of bytes to be read. * * We will call this function to change the current boot flags. * We expect a precise syntax: * \"n\" (n == 0 or 1) to toggle AutoSearch Off or On */ static ssize_t pdcs_autoboot_write(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { return pdcs_auto_write(kobj, attr, buf, count, PF_AUTOBOOT); } /** * pdcs_autosearch_write - This function handles autosearch flag modifying. * @buf: The input buffer to read from. * @count: The number of bytes to be read. * * We will call this function to change the current boot flags. * We expect a precise syntax: * \"n\" (n == 0 or 1) to toggle AutoSearch Off or On */ static ssize_t pdcs_autosearch_write(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { return pdcs_auto_write(kobj, attr, buf, count, PF_AUTOSEARCH); } /** * pdcs_osdep1_write - Stable Storage OS-Dependent data area 1 input. * @buf: The input buffer to read from. * @count: The number of bytes to be read. * * This can store 16 bytes of OS-Dependent data. We use a byte-by-byte * write approach. It's up to userspace to deal with it when constructing * its input buffer. */ static ssize_t pdcs_osdep1_write(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { u8 in[16]; if (!capable(CAP_SYS_ADMIN)) return -EACCES; if (!buf || !count) return -EINVAL; if (unlikely(pdcs_osid != OS_ID_LINUX)) return -EPERM; if (count > 16) return -EMSGSIZE; /* We'll use a local copy of buf */ memset(in, 0, 16); memcpy(in, buf, count); if (pdc_stable_write(PDCS_ADDR_OSD1, &in, sizeof(in)) != PDC_OK) return -EIO; return count; } /** * pdcs_osdep2_write - Stable Storage OS-Dependent data area 2 input. * @buf: The input buffer to read from. * @count: The number of bytes to be read. * * This can store pdcs_size - 224 bytes of OS-Dependent data. We use a * byte-by-byte write approach. It's up to userspace to deal with it when * constructing its input buffer. */ static ssize_t pdcs_osdep2_write(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { unsigned long size; unsigned short i; u8 in[4]; if (!capable(CAP_SYS_ADMIN)) return -EACCES; if (!buf || !count) return -EINVAL; if (unlikely(pdcs_size <= 224)) return -ENOSYS; if (unlikely(pdcs_osid != OS_ID_LINUX)) return -EPERM; size = pdcs_size - 224; if (count > size) return -EMSGSIZE; /* We'll use a local copy of buf */ for (i=0; i<count; i+=4) { memset(in, 0, 4); memcpy(in, buf+i, (count-i < 4) ? count-i : 4); if (unlikely(pdc_stable_write(PDCS_ADDR_OSD2 + i, &in, sizeof(in)) != PDC_OK)) return -EIO; } return count; } /* The remaining attributes. */ static PDCS_ATTR(size, 0444, pdcs_size_read, NULL); static PDCS_ATTR(autoboot, 0644, pdcs_autoboot_read, pdcs_autoboot_write); static PDCS_ATTR(autosearch, 0644, pdcs_autosearch_read, pdcs_autosearch_write); static PDCS_ATTR(timer, 0444, pdcs_timer_read, NULL); static PDCS_ATTR(osid, 0444, pdcs_osid_read, NULL); static PDCS_ATTR(osdep1, 0600, pdcs_osdep1_read, pdcs_osdep1_write); static PDCS_ATTR(diagnostic, 0400, pdcs_diagnostic_read, NULL); static PDCS_ATTR(fastsize, 0400, pdcs_fastsize_read, NULL); static PDCS_ATTR(osdep2, 0600, pdcs_osdep2_read, pdcs_osdep2_write); static struct attribute *pdcs_subsys_attrs[] = { &pdcs_attr_size.attr, &pdcs_attr_autoboot.attr, &pdcs_attr_autosearch.attr, &pdcs_attr_timer.attr, &pdcs_attr_osid.attr, &pdcs_attr_osdep1.attr, &pdcs_attr_diagnostic.attr, &pdcs_attr_fastsize.attr, &pdcs_attr_osdep2.attr, NULL, }; static const struct attribute_group pdcs_attr_group = { .attrs = pdcs_subsys_attrs, }; static struct kobject *stable_kobj; static struct kset *paths_kset; /** * pdcs_register_pathentries - Prepares path entries kobjects for sysfs usage. * * It creates kobjects corresponding to each path entry with nice sysfs * links to the real device. This is where the magic takes place: when * registering the subsystem attributes during module init, each kobject hereby * created will show in the sysfs tree as a folder containing files as defined * by path_subsys_attr[]. */ static inline int __init pdcs_register_pathentries(void) { unsigned short i; struct pdcspath_entry *entry; int err; /* Initialize the entries rw_lock before anything else */ for (i = 0; (entry = pdcspath_entries[i]); i++) rwlock_init(&entry->rw_lock); for (i = 0; (entry = pdcspath_entries[i]); i++) { write_lock(&entry->rw_lock); err = pdcspath_fetch(entry); write_unlock(&entry->rw_lock); if (err < 0) continue; entry->kobj.kset = paths_kset; err = kobject_init_and_add(&entry->kobj, &ktype_pdcspath, NULL, "%s", entry->name); if (err) return err; /* kobject is now registered */ write_lock(&entry->rw_lock); entry->ready = 2; write_unlock(&entry->rw_lock); /* Add a nice symlink to the real device */ if (entry->dev) { err = sysfs_create_link(&entry->kobj, &entry->dev->kobj, "device"); WARN_ON(err); } kobject_uevent(&entry->kobj, KOBJ_ADD); } return 0; } /** * pdcs_unregister_pathentries - Routine called when unregistering the module. */ static inline void pdcs_unregister_pathentries(void) { unsigned short i; struct pdcspath_entry *entry; for (i = 0; (entry = pdcspath_entries[i]); i++) { read_lock(&entry->rw_lock); if (entry->ready >= 2) kobject_put(&entry->kobj); read_unlock(&entry->rw_lock); } } /* * For now we register the stable subsystem with the firmware subsystem * and the paths subsystem with the stable subsystem */ static int __init pdc_stable_init(void) { int rc = 0, error = 0; u32 result; /* find the size of the stable storage */ if (pdc_stable_get_size(&pdcs_size) != PDC_OK) return -ENODEV; /* make sure we have enough data */ if (pdcs_size < 96) return -ENODATA; printk(KERN_INFO PDCS_PREFIX " facility v%s\n", PDCS_VERSION); /* get OSID */ if (pdc_stable_read(PDCS_ADDR_OSID, &result, sizeof(result)) != PDC_OK) return -EIO; /* the actual result is 16 bits away */ pdcs_osid = (u16)(result >> 16); /* For now we'll register the directory at /sys/firmware/stable */ stable_kobj = kobject_create_and_add("stable", firmware_kobj); if (!stable_kobj) { rc = -ENOMEM; goto fail_firmreg; } /* Don't forget the root entries */ error = sysfs_create_group(stable_kobj, &pdcs_attr_group); /* register the paths kset as a child of the stable kset */ paths_kset = kset_create_and_add("paths", NULL, stable_kobj); if (!paths_kset) { rc = -ENOMEM; goto fail_ksetreg; } /* now we create all "files" for the paths kset */ if ((rc = pdcs_register_pathentries())) goto fail_pdcsreg; return rc; fail_pdcsreg: pdcs_unregister_pathentries(); kset_unregister(paths_kset); fail_ksetreg: kobject_put(stable_kobj); fail_firmreg: printk(KERN_INFO PDCS_PREFIX " bailing out\n"); return rc; } static void __exit pdc_stable_exit(void) { pdcs_unregister_pathentries(); kset_unregister(paths_kset); kobject_put(stable_kobj); } module_init(pdc_stable_init); module_exit(pdc_stable_exit);
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