![Thibaut VARENE](/assets/img/avatar_default.png)
pdc_stable v0.22, changes since v0.10: o renamed root subsystem from 'pdc' to 'stable' o split 'info' into several files, one per PDC field o implemented 'autoboot' and 'autosearch' write calls to toggle these flags o grant read permission to all users on "safe" files o more code cleanup (removed duplicate code) o avoid bad stable storage clobbering by write locking critical sections o print consistent data as well o SMP cleanups Signed-off-by: Thibaut VARENE <varenet@parisc-linux.org> Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
924 lines
27 KiB
C
924 lines
27 KiB
C
/*
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* Interfaces to retrieve and set PDC Stable options (firmware)
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*
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* Copyright (C) 2005-2006 Thibaut VARENE <varenet@parisc-linux.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*
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* DEV NOTE: the PDC Procedures reference states that:
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* "A minimum of 96 bytes of Stable Storage is required. Providing more than
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* 96 bytes of Stable Storage is optional [...]. Failure to provide the
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* optional locations from 96 to 192 results in the loss of certain
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* functionality during boot."
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*
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* Since locations between 96 and 192 are the various paths, most (if not
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* all) PA-RISC machines should have them. Anyway, for safety reasons, the
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* following code can deal with just 96 bytes of Stable Storage, and all
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* sizes between 96 and 192 bytes (provided they are multiple of struct
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* device_path size, eg: 128, 160 and 192) to provide full information.
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* The code makes no use of data above 192 bytes. One last word: there's one
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* path we can always count on: the primary path.
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*
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* The current policy wrt file permissions is:
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* - write: root only
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* - read: (reading triggers PDC calls) ? root only : everyone
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* The rationale is that PDC calls could hog (DoS) the machine.
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*
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* TODO:
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* - timer/fastsize write calls
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*/
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#undef PDCS_DEBUG
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#ifdef PDCS_DEBUG
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#define DPRINTK(fmt, args...) printk(KERN_DEBUG fmt, ## args)
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#else
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#define DPRINTK(fmt, args...)
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#endif
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/capability.h>
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#include <linux/ctype.h>
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#include <linux/sysfs.h>
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#include <linux/kobject.h>
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#include <linux/device.h>
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#include <linux/errno.h>
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#include <linux/spinlock.h>
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#include <asm/pdc.h>
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#include <asm/page.h>
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#include <asm/uaccess.h>
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#include <asm/hardware.h>
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#define PDCS_VERSION "0.22"
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#define PDCS_PREFIX "PDC Stable Storage"
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#define PDCS_ADDR_PPRI 0x00
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#define PDCS_ADDR_OSID 0x40
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#define PDCS_ADDR_FSIZ 0x5C
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#define PDCS_ADDR_PCON 0x60
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#define PDCS_ADDR_PALT 0x80
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#define PDCS_ADDR_PKBD 0xA0
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MODULE_AUTHOR("Thibaut VARENE <varenet@parisc-linux.org>");
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MODULE_DESCRIPTION("sysfs interface to HP PDC Stable Storage data");
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MODULE_LICENSE("GPL");
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MODULE_VERSION(PDCS_VERSION);
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/* holds Stable Storage size. Initialized once and for all, no lock needed */
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static unsigned long pdcs_size __read_mostly;
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/* This struct defines what we need to deal with a parisc pdc path entry */
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struct pdcspath_entry {
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rwlock_t rw_lock; /* to protect path entry access */
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short ready; /* entry record is valid if != 0 */
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unsigned long addr; /* entry address in stable storage */
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char *name; /* entry name */
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struct device_path devpath; /* device path in parisc representation */
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struct device *dev; /* corresponding device */
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struct kobject kobj;
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};
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struct pdcspath_attribute {
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struct attribute attr;
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ssize_t (*show)(struct pdcspath_entry *entry, char *buf);
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ssize_t (*store)(struct pdcspath_entry *entry, const char *buf, size_t count);
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};
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#define PDCSPATH_ENTRY(_addr, _name) \
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struct pdcspath_entry pdcspath_entry_##_name = { \
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.ready = 0, \
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.addr = _addr, \
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.name = __stringify(_name), \
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};
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#define PDCS_ATTR(_name, _mode, _show, _store) \
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struct subsys_attribute pdcs_attr_##_name = { \
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.attr = {.name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE}, \
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.show = _show, \
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.store = _store, \
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};
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#define PATHS_ATTR(_name, _mode, _show, _store) \
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struct pdcspath_attribute paths_attr_##_name = { \
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.attr = {.name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE}, \
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.show = _show, \
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.store = _store, \
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};
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#define to_pdcspath_attribute(_attr) container_of(_attr, struct pdcspath_attribute, attr)
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#define to_pdcspath_entry(obj) container_of(obj, struct pdcspath_entry, kobj)
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/**
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* pdcspath_fetch - This function populates the path entry structs.
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* @entry: A pointer to an allocated pdcspath_entry.
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*
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* The general idea is that you don't read from the Stable Storage every time
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* you access the files provided by the facilites. We store a copy of the
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* content of the stable storage WRT various paths in these structs. We read
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* these structs when reading the files, and we will write to these structs when
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* writing to the files, and only then write them back to the Stable Storage.
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*
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* This function expects to be called with @entry->rw_lock write-hold.
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*/
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static int
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pdcspath_fetch(struct pdcspath_entry *entry)
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{
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struct device_path *devpath;
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if (!entry)
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return -EINVAL;
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devpath = &entry->devpath;
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DPRINTK("%s: fetch: 0x%p, 0x%p, addr: 0x%lx\n", __func__,
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entry, devpath, entry->addr);
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/* addr, devpath and count must be word aligned */
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if (pdc_stable_read(entry->addr, devpath, sizeof(*devpath)) != PDC_OK)
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return -EIO;
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/* Find the matching device.
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NOTE: hardware_path overlays with device_path, so the nice cast can
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be used */
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entry->dev = hwpath_to_device((struct hardware_path *)devpath);
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entry->ready = 1;
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DPRINTK("%s: device: 0x%p\n", __func__, entry->dev);
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return 0;
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}
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/**
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* pdcspath_store - This function writes a path to stable storage.
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* @entry: A pointer to an allocated pdcspath_entry.
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*
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* It can be used in two ways: either by passing it a preset devpath struct
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* containing an already computed hardware path, or by passing it a device
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* pointer, from which it'll find out the corresponding hardware path.
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* For now we do not handle the case where there's an error in writing to the
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* Stable Storage area, so you'd better not mess up the data :P
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*
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* This function expects to be called with @entry->rw_lock write-hold.
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*/
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static void
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pdcspath_store(struct pdcspath_entry *entry)
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{
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struct device_path *devpath;
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BUG_ON(!entry);
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devpath = &entry->devpath;
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/* We expect the caller to set the ready flag to 0 if the hardware
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path struct provided is invalid, so that we know we have to fill it.
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First case, we don't have a preset hwpath... */
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if (!entry->ready) {
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/* ...but we have a device, map it */
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BUG_ON(!entry->dev);
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device_to_hwpath(entry->dev, (struct hardware_path *)devpath);
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}
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/* else, we expect the provided hwpath to be valid. */
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DPRINTK("%s: store: 0x%p, 0x%p, addr: 0x%lx\n", __func__,
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entry, devpath, entry->addr);
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/* addr, devpath and count must be word aligned */
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if (pdc_stable_write(entry->addr, devpath, sizeof(*devpath)) != PDC_OK) {
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printk(KERN_ERR "%s: an error occured when writing to PDC.\n"
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"It is likely that the Stable Storage data has been corrupted.\n"
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"Please check it carefully upon next reboot.\n", __func__);
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WARN_ON(1);
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}
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/* kobject is already registered */
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entry->ready = 2;
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DPRINTK("%s: device: 0x%p\n", __func__, entry->dev);
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}
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/**
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* pdcspath_hwpath_read - This function handles hardware path pretty printing.
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* @entry: An allocated and populated pdscpath_entry struct.
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* @buf: The output buffer to write to.
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*
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* We will call this function to format the output of the hwpath attribute file.
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*/
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static ssize_t
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pdcspath_hwpath_read(struct pdcspath_entry *entry, char *buf)
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{
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char *out = buf;
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struct device_path *devpath;
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short i;
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if (!entry || !buf)
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return -EINVAL;
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read_lock(&entry->rw_lock);
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devpath = &entry->devpath;
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i = entry->ready;
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read_unlock(&entry->rw_lock);
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if (!i) /* entry is not ready */
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return -ENODATA;
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for (i = 0; i < 6; i++) {
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if (devpath->bc[i] >= 128)
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continue;
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out += sprintf(out, "%u/", (unsigned char)devpath->bc[i]);
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}
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out += sprintf(out, "%u\n", (unsigned char)devpath->mod);
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return out - buf;
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}
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/**
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* pdcspath_hwpath_write - This function handles hardware path modifying.
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* @entry: An allocated and populated pdscpath_entry struct.
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* @buf: The input buffer to read from.
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* @count: The number of bytes to be read.
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*
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* We will call this function to change the current hardware path.
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* Hardware paths are to be given '/'-delimited, without brackets.
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* We make sure that the provided path actually maps to an existing
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* device, BUT nothing would prevent some foolish user to set the path to some
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* PCI bridge or even a CPU...
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* A better work around would be to make sure we are at the end of a device tree
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* for instance, but it would be IMHO beyond the simple scope of that driver.
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* The aim is to provide a facility. Data correctness is left to userland.
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*/
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static ssize_t
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pdcspath_hwpath_write(struct pdcspath_entry *entry, const char *buf, size_t count)
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{
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struct hardware_path hwpath;
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unsigned short i;
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char in[count+1], *temp;
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struct device *dev;
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if (!entry || !buf || !count)
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return -EINVAL;
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/* We'll use a local copy of buf */
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memset(in, 0, count+1);
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strncpy(in, buf, count);
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/* Let's clean up the target. 0xff is a blank pattern */
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memset(&hwpath, 0xff, sizeof(hwpath));
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/* First, pick the mod field (the last one of the input string) */
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if (!(temp = strrchr(in, '/')))
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return -EINVAL;
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hwpath.mod = simple_strtoul(temp+1, NULL, 10);
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in[temp-in] = '\0'; /* truncate the remaining string. just precaution */
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DPRINTK("%s: mod: %d\n", __func__, hwpath.mod);
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/* Then, loop for each delimiter, making sure we don't have too many.
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we write the bc fields in a down-top way. No matter what, we stop
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before writing the last field. If there are too many fields anyway,
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then the user is a moron and it'll be caught up later when we'll
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check the consistency of the given hwpath. */
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for (i=5; ((temp = strrchr(in, '/'))) && (temp-in > 0) && (likely(i)); i--) {
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hwpath.bc[i] = simple_strtoul(temp+1, NULL, 10);
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in[temp-in] = '\0';
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DPRINTK("%s: bc[%d]: %d\n", __func__, i, hwpath.bc[i]);
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}
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/* Store the final field */
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hwpath.bc[i] = simple_strtoul(in, NULL, 10);
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DPRINTK("%s: bc[%d]: %d\n", __func__, i, hwpath.bc[i]);
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/* Now we check that the user isn't trying to lure us */
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if (!(dev = hwpath_to_device((struct hardware_path *)&hwpath))) {
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printk(KERN_WARNING "%s: attempt to set invalid \"%s\" "
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"hardware path: %s\n", __func__, entry->name, buf);
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return -EINVAL;
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}
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/* So far so good, let's get in deep */
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write_lock(&entry->rw_lock);
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entry->ready = 0;
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entry->dev = dev;
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/* Now, dive in. Write back to the hardware */
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pdcspath_store(entry);
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/* Update the symlink to the real device */
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sysfs_remove_link(&entry->kobj, "device");
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sysfs_create_link(&entry->kobj, &entry->dev->kobj, "device");
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write_unlock(&entry->rw_lock);
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printk(KERN_INFO PDCS_PREFIX ": changed \"%s\" path to \"%s\"\n",
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entry->name, buf);
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return count;
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}
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/**
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* pdcspath_layer_read - Extended layer (eg. SCSI ids) pretty printing.
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* @entry: An allocated and populated pdscpath_entry struct.
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* @buf: The output buffer to write to.
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*
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* We will call this function to format the output of the layer attribute file.
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*/
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static ssize_t
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pdcspath_layer_read(struct pdcspath_entry *entry, char *buf)
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{
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char *out = buf;
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struct device_path *devpath;
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short i;
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if (!entry || !buf)
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return -EINVAL;
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read_lock(&entry->rw_lock);
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devpath = &entry->devpath;
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i = entry->ready;
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read_unlock(&entry->rw_lock);
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if (!i) /* entry is not ready */
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return -ENODATA;
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for (i = 0; devpath->layers[i] && (likely(i < 6)); i++)
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out += sprintf(out, "%u ", devpath->layers[i]);
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out += sprintf(out, "\n");
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return out - buf;
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}
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/**
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* pdcspath_layer_write - This function handles extended layer modifying.
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* @entry: An allocated and populated pdscpath_entry struct.
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* @buf: The input buffer to read from.
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* @count: The number of bytes to be read.
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*
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* We will call this function to change the current layer value.
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* Layers are to be given '.'-delimited, without brackets.
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* XXX beware we are far less checky WRT input data provided than for hwpath.
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* Potential harm can be done, since there's no way to check the validity of
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* the layer fields.
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*/
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static ssize_t
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pdcspath_layer_write(struct pdcspath_entry *entry, const char *buf, size_t count)
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{
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unsigned int layers[6]; /* device-specific info (ctlr#, unit#, ...) */
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unsigned short i;
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char in[count+1], *temp;
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if (!entry || !buf || !count)
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return -EINVAL;
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/* We'll use a local copy of buf */
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memset(in, 0, count+1);
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strncpy(in, buf, count);
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/* Let's clean up the target. 0 is a blank pattern */
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memset(&layers, 0, sizeof(layers));
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/* First, pick the first layer */
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if (unlikely(!isdigit(*in)))
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return -EINVAL;
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layers[0] = simple_strtoul(in, NULL, 10);
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DPRINTK("%s: layer[0]: %d\n", __func__, layers[0]);
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temp = in;
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for (i=1; ((temp = strchr(temp, '.'))) && (likely(i<6)); i++) {
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if (unlikely(!isdigit(*(++temp))))
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return -EINVAL;
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layers[i] = simple_strtoul(temp, NULL, 10);
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DPRINTK("%s: layer[%d]: %d\n", __func__, i, layers[i]);
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}
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/* So far so good, let's get in deep */
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write_lock(&entry->rw_lock);
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/* First, overwrite the current layers with the new ones, not touching
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the hardware path. */
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memcpy(&entry->devpath.layers, &layers, sizeof(layers));
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/* Now, dive in. Write back to the hardware */
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pdcspath_store(entry);
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write_unlock(&entry->rw_lock);
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printk(KERN_INFO PDCS_PREFIX ": changed \"%s\" layers to \"%s\"\n",
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entry->name, buf);
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return count;
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}
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/**
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* pdcspath_attr_show - Generic read function call wrapper.
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* @kobj: The kobject to get info from.
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* @attr: The attribute looked upon.
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* @buf: The output buffer.
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*/
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static ssize_t
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pdcspath_attr_show(struct kobject *kobj, struct attribute *attr, char *buf)
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{
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struct pdcspath_entry *entry = to_pdcspath_entry(kobj);
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struct pdcspath_attribute *pdcs_attr = to_pdcspath_attribute(attr);
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ssize_t ret = 0;
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if (pdcs_attr->show)
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ret = pdcs_attr->show(entry, buf);
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return ret;
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}
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/**
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* pdcspath_attr_store - Generic write function call wrapper.
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* @kobj: The kobject to write info to.
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* @attr: The attribute to be modified.
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* @buf: The input buffer.
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* @count: The size of the buffer.
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*/
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static ssize_t
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pdcspath_attr_store(struct kobject *kobj, struct attribute *attr,
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const char *buf, size_t count)
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{
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struct pdcspath_entry *entry = to_pdcspath_entry(kobj);
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struct pdcspath_attribute *pdcs_attr = to_pdcspath_attribute(attr);
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ssize_t ret = 0;
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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if (pdcs_attr->store)
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ret = pdcs_attr->store(entry, buf, count);
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return ret;
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}
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static struct sysfs_ops pdcspath_attr_ops = {
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.show = pdcspath_attr_show,
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.store = pdcspath_attr_store,
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};
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/* These are the two attributes of any PDC path. */
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|
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.
|
|
* @entry: An allocated and populated subsytem struct. We don't use it tho.
|
|
* @buf: The output buffer to write to.
|
|
*/
|
|
static ssize_t
|
|
pdcs_size_read(struct subsystem *entry, char *buf)
|
|
{
|
|
char *out = buf;
|
|
|
|
if (!entry || !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.
|
|
* @entry: An allocated and populated subsytem struct. We don't use it tho.
|
|
* @buf: The output buffer to write to.
|
|
* @knob: The PF_AUTOBOOT or PF_AUTOSEARCH flag
|
|
*/
|
|
static ssize_t
|
|
pdcs_auto_read(struct subsystem *entry, char *buf, int knob)
|
|
{
|
|
char *out = buf;
|
|
struct pdcspath_entry *pathentry;
|
|
|
|
if (!entry || !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.
|
|
* @entry: An allocated and populated subsytem struct. We don't use it tho.
|
|
* @buf: The output buffer to write to.
|
|
*/
|
|
static inline ssize_t
|
|
pdcs_autoboot_read(struct subsystem *entry, char *buf)
|
|
{
|
|
return pdcs_auto_read(entry, buf, PF_AUTOBOOT);
|
|
}
|
|
|
|
/**
|
|
* pdcs_autosearch_read - Stable Storage autoboot flag output.
|
|
* @entry: An allocated and populated subsytem struct. We don't use it tho.
|
|
* @buf: The output buffer to write to.
|
|
*/
|
|
static inline ssize_t
|
|
pdcs_autosearch_read(struct subsystem *entry, char *buf)
|
|
{
|
|
return pdcs_auto_read(entry, buf, PF_AUTOSEARCH);
|
|
}
|
|
|
|
/**
|
|
* pdcs_timer_read - Stable Storage timer count output (in seconds).
|
|
* @entry: An allocated and populated subsytem struct. We don't use it tho.
|
|
* @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 subsystem *entry, char *buf)
|
|
{
|
|
char *out = buf;
|
|
struct pdcspath_entry *pathentry;
|
|
|
|
if (!entry || !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.
|
|
* @entry: An allocated and populated subsytem struct. We don't use it tho.
|
|
* @buf: The output buffer to write to.
|
|
*/
|
|
static ssize_t
|
|
pdcs_osid_read(struct subsystem *entry, char *buf)
|
|
{
|
|
char *out = buf;
|
|
__u32 result;
|
|
char *tmpstr = NULL;
|
|
|
|
if (!entry || !buf)
|
|
return -EINVAL;
|
|
|
|
/* get OSID */
|
|
if (pdc_stable_read(PDCS_ADDR_OSID, &result, sizeof(result)) != PDC_OK)
|
|
return -EIO;
|
|
|
|
/* the actual result is 16 bits away */
|
|
switch (result >> 16) {
|
|
case 0x0000: tmpstr = "No OS-dependent data"; break;
|
|
case 0x0001: tmpstr = "HP-UX dependent data"; break;
|
|
case 0x0002: tmpstr = "MPE-iX dependent data"; break;
|
|
case 0x0003: tmpstr = "OSF dependent data"; break;
|
|
case 0x0004: tmpstr = "HP-RT dependent data"; break;
|
|
case 0x0005: tmpstr = "Novell Netware dependent data"; break;
|
|
default: tmpstr = "Unknown"; break;
|
|
}
|
|
out += sprintf(out, "%s (0x%.4x)\n", tmpstr, (result >> 16));
|
|
|
|
return out - buf;
|
|
}
|
|
|
|
/**
|
|
* pdcs_fastsize_read - Stable Storage FastSize register output.
|
|
* @entry: An allocated and populated subsytem struct. We don't use it tho.
|
|
* @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 subsystem *entry, char *buf)
|
|
{
|
|
char *out = buf;
|
|
__u32 result;
|
|
|
|
if (!entry || !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_auto_write - This function handles autoboot/search flag modifying.
|
|
* @entry: An allocated and populated subsytem struct. We don't use it tho.
|
|
* @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 subsystem *entry, const char *buf, size_t count, int knob)
|
|
{
|
|
struct pdcspath_entry *pathentry;
|
|
unsigned char flags;
|
|
char in[count+1], *temp;
|
|
char c;
|
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EACCES;
|
|
|
|
if (!entry || !buf || !count)
|
|
return -EINVAL;
|
|
|
|
/* We'll use a local copy of buf */
|
|
memset(in, 0, count+1);
|
|
strncpy(in, buf, count);
|
|
|
|
/* 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 = in;
|
|
|
|
while (*temp && isspace(*temp))
|
|
temp++;
|
|
|
|
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.
|
|
* @entry: An allocated and populated subsytem struct. We don't use it tho.
|
|
* @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 inline ssize_t
|
|
pdcs_autoboot_write(struct subsystem *entry, const char *buf, size_t count)
|
|
{
|
|
return pdcs_auto_write(entry, buf, count, PF_AUTOBOOT);
|
|
}
|
|
|
|
/**
|
|
* pdcs_autosearch_write - This function handles autosearch flag modifying.
|
|
* @entry: An allocated and populated subsytem struct. We don't use it tho.
|
|
* @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 inline ssize_t
|
|
pdcs_autosearch_write(struct subsystem *entry, const char *buf, size_t count)
|
|
{
|
|
return pdcs_auto_write(entry, buf, count, PF_AUTOSEARCH);
|
|
}
|
|
|
|
/* 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, 0400, pdcs_osid_read, NULL);
|
|
static PDCS_ATTR(fastsize, 0400, pdcs_fastsize_read, NULL);
|
|
|
|
static struct subsys_attribute *pdcs_subsys_attrs[] = {
|
|
&pdcs_attr_size,
|
|
&pdcs_attr_autoboot,
|
|
&pdcs_attr_autosearch,
|
|
&pdcs_attr_timer,
|
|
&pdcs_attr_osid,
|
|
&pdcs_attr_fastsize,
|
|
NULL,
|
|
};
|
|
|
|
static decl_subsys(paths, &ktype_pdcspath, NULL);
|
|
static decl_subsys(stable, NULL, NULL);
|
|
|
|
/**
|
|
* 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;
|
|
|
|
if ((err = kobject_set_name(&entry->kobj, "%s", entry->name)))
|
|
return err;
|
|
kobj_set_kset_s(entry, paths_subsys);
|
|
if ((err = kobject_register(&entry->kobj)))
|
|
return err;
|
|
|
|
/* kobject is now registered */
|
|
write_lock(&entry->rw_lock);
|
|
entry->ready = 2;
|
|
|
|
/* Add a nice symlink to the real device */
|
|
if (entry->dev)
|
|
sysfs_create_link(&entry->kobj, &entry->dev->kobj, "device");
|
|
|
|
write_unlock(&entry->rw_lock);
|
|
}
|
|
|
|
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_unregister(&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)
|
|
{
|
|
struct subsys_attribute *attr;
|
|
int i, rc = 0, error = 0;
|
|
|
|
/* 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);
|
|
|
|
/* For now we'll register the stable subsys within this driver */
|
|
if ((rc = firmware_register(&stable_subsys)))
|
|
goto fail_firmreg;
|
|
|
|
/* Don't forget the root entries */
|
|
for (i = 0; (attr = pdcs_subsys_attrs[i]) && !error; i++)
|
|
if (attr->show)
|
|
error = subsys_create_file(&stable_subsys, attr);
|
|
|
|
/* register the paths subsys as a subsystem of stable subsys */
|
|
kset_set_kset_s(&paths_subsys, stable_subsys);
|
|
if ((rc= subsystem_register(&paths_subsys)))
|
|
goto fail_subsysreg;
|
|
|
|
/* now we create all "files" for the paths subsys */
|
|
if ((rc = pdcs_register_pathentries()))
|
|
goto fail_pdcsreg;
|
|
|
|
return rc;
|
|
|
|
fail_pdcsreg:
|
|
pdcs_unregister_pathentries();
|
|
subsystem_unregister(&paths_subsys);
|
|
|
|
fail_subsysreg:
|
|
firmware_unregister(&stable_subsys);
|
|
|
|
fail_firmreg:
|
|
printk(KERN_INFO PDCS_PREFIX " bailing out\n");
|
|
return rc;
|
|
}
|
|
|
|
static void __exit
|
|
pdc_stable_exit(void)
|
|
{
|
|
pdcs_unregister_pathentries();
|
|
subsystem_unregister(&paths_subsys);
|
|
|
|
firmware_unregister(&stable_subsys);
|
|
}
|
|
|
|
|
|
module_init(pdc_stable_init);
|
|
module_exit(pdc_stable_exit);
|