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![Jay Fenlason](/assets/img/avatar_default.png)
Share code between fw_send_request + wait_for_completion callers. Signed-off-by: Jay Fenlason <fenlason@redhat.com> Addendum: Removes an unnecessary struct and an ununsed retry loop. Calls it fw_run_transaction() instead of fw_send_request_sync(). Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> Acked-by: Kristian Høgsberg <krh@redhat.com>
1003 lines
26 KiB
C
1003 lines
26 KiB
C
/*
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* Device probing and sysfs code.
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*
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* Copyright (C) 2005-2006 Kristian Hoegsberg <krh@bitplanet.net>
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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 Foundation,
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* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <linux/module.h>
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#include <linux/wait.h>
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#include <linux/errno.h>
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#include <linux/kthread.h>
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#include <linux/device.h>
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#include <linux/delay.h>
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#include <linux/idr.h>
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#include <linux/string.h>
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#include <linux/rwsem.h>
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#include <linux/semaphore.h>
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#include <asm/system.h>
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#include <linux/ctype.h>
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#include "fw-transaction.h"
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#include "fw-topology.h"
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#include "fw-device.h"
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void fw_csr_iterator_init(struct fw_csr_iterator *ci, u32 * p)
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{
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ci->p = p + 1;
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ci->end = ci->p + (p[0] >> 16);
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}
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EXPORT_SYMBOL(fw_csr_iterator_init);
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int fw_csr_iterator_next(struct fw_csr_iterator *ci, int *key, int *value)
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{
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*key = *ci->p >> 24;
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*value = *ci->p & 0xffffff;
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return ci->p++ < ci->end;
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}
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EXPORT_SYMBOL(fw_csr_iterator_next);
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static int is_fw_unit(struct device *dev);
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static int match_unit_directory(u32 * directory, const struct fw_device_id *id)
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{
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struct fw_csr_iterator ci;
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int key, value, match;
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match = 0;
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fw_csr_iterator_init(&ci, directory);
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while (fw_csr_iterator_next(&ci, &key, &value)) {
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if (key == CSR_VENDOR && value == id->vendor)
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match |= FW_MATCH_VENDOR;
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if (key == CSR_MODEL && value == id->model)
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match |= FW_MATCH_MODEL;
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if (key == CSR_SPECIFIER_ID && value == id->specifier_id)
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match |= FW_MATCH_SPECIFIER_ID;
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if (key == CSR_VERSION && value == id->version)
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match |= FW_MATCH_VERSION;
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}
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return (match & id->match_flags) == id->match_flags;
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}
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static int fw_unit_match(struct device *dev, struct device_driver *drv)
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{
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struct fw_unit *unit = fw_unit(dev);
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struct fw_driver *driver = fw_driver(drv);
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int i;
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/* We only allow binding to fw_units. */
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if (!is_fw_unit(dev))
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return 0;
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for (i = 0; driver->id_table[i].match_flags != 0; i++) {
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if (match_unit_directory(unit->directory, &driver->id_table[i]))
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return 1;
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}
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return 0;
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}
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static int get_modalias(struct fw_unit *unit, char *buffer, size_t buffer_size)
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{
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struct fw_device *device = fw_device(unit->device.parent);
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struct fw_csr_iterator ci;
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int key, value;
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int vendor = 0;
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int model = 0;
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int specifier_id = 0;
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int version = 0;
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fw_csr_iterator_init(&ci, &device->config_rom[5]);
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while (fw_csr_iterator_next(&ci, &key, &value)) {
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switch (key) {
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case CSR_VENDOR:
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vendor = value;
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break;
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case CSR_MODEL:
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model = value;
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break;
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}
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}
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fw_csr_iterator_init(&ci, unit->directory);
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while (fw_csr_iterator_next(&ci, &key, &value)) {
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switch (key) {
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case CSR_SPECIFIER_ID:
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specifier_id = value;
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break;
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case CSR_VERSION:
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version = value;
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break;
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}
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}
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return snprintf(buffer, buffer_size,
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"ieee1394:ven%08Xmo%08Xsp%08Xver%08X",
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vendor, model, specifier_id, version);
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}
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static int
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fw_unit_uevent(struct device *dev, struct kobj_uevent_env *env)
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{
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struct fw_unit *unit = fw_unit(dev);
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char modalias[64];
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get_modalias(unit, modalias, sizeof(modalias));
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if (add_uevent_var(env, "MODALIAS=%s", modalias))
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return -ENOMEM;
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return 0;
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}
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struct bus_type fw_bus_type = {
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.name = "firewire",
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.match = fw_unit_match,
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};
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EXPORT_SYMBOL(fw_bus_type);
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static void fw_device_release(struct device *dev)
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{
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struct fw_device *device = fw_device(dev);
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struct fw_card *card = device->card;
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unsigned long flags;
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/*
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* Take the card lock so we don't set this to NULL while a
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* FW_NODE_UPDATED callback is being handled.
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*/
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spin_lock_irqsave(&card->lock, flags);
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device->node->data = NULL;
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spin_unlock_irqrestore(&card->lock, flags);
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fw_node_put(device->node);
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kfree(device->config_rom);
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kfree(device);
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fw_card_put(card);
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}
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int fw_device_enable_phys_dma(struct fw_device *device)
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{
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int generation = device->generation;
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/* device->node_id, accessed below, must not be older than generation */
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smp_rmb();
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return device->card->driver->enable_phys_dma(device->card,
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device->node_id,
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generation);
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}
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EXPORT_SYMBOL(fw_device_enable_phys_dma);
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struct config_rom_attribute {
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struct device_attribute attr;
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u32 key;
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};
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static ssize_t
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show_immediate(struct device *dev, struct device_attribute *dattr, char *buf)
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{
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struct config_rom_attribute *attr =
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container_of(dattr, struct config_rom_attribute, attr);
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struct fw_csr_iterator ci;
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u32 *dir;
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int key, value, ret = -ENOENT;
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down_read(&fw_device_rwsem);
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if (is_fw_unit(dev))
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dir = fw_unit(dev)->directory;
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else
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dir = fw_device(dev)->config_rom + 5;
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fw_csr_iterator_init(&ci, dir);
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while (fw_csr_iterator_next(&ci, &key, &value))
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if (attr->key == key) {
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ret = snprintf(buf, buf ? PAGE_SIZE : 0,
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"0x%06x\n", value);
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break;
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}
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up_read(&fw_device_rwsem);
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return ret;
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}
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#define IMMEDIATE_ATTR(name, key) \
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{ __ATTR(name, S_IRUGO, show_immediate, NULL), key }
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static ssize_t
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show_text_leaf(struct device *dev, struct device_attribute *dattr, char *buf)
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{
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struct config_rom_attribute *attr =
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container_of(dattr, struct config_rom_attribute, attr);
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struct fw_csr_iterator ci;
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u32 *dir, *block = NULL, *p, *end;
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int length, key, value, last_key = 0, ret = -ENOENT;
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char *b;
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down_read(&fw_device_rwsem);
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if (is_fw_unit(dev))
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dir = fw_unit(dev)->directory;
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else
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dir = fw_device(dev)->config_rom + 5;
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fw_csr_iterator_init(&ci, dir);
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while (fw_csr_iterator_next(&ci, &key, &value)) {
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if (attr->key == last_key &&
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key == (CSR_DESCRIPTOR | CSR_LEAF))
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block = ci.p - 1 + value;
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last_key = key;
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}
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if (block == NULL)
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goto out;
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length = min(block[0] >> 16, 256U);
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if (length < 3)
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goto out;
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if (block[1] != 0 || block[2] != 0)
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/* Unknown encoding. */
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goto out;
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if (buf == NULL) {
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ret = length * 4;
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goto out;
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}
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b = buf;
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end = &block[length + 1];
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for (p = &block[3]; p < end; p++, b += 4)
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* (u32 *) b = (__force u32) __cpu_to_be32(*p);
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/* Strip trailing whitespace and add newline. */
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while (b--, (isspace(*b) || *b == '\0') && b > buf);
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strcpy(b + 1, "\n");
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ret = b + 2 - buf;
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out:
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up_read(&fw_device_rwsem);
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return ret;
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}
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#define TEXT_LEAF_ATTR(name, key) \
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{ __ATTR(name, S_IRUGO, show_text_leaf, NULL), key }
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static struct config_rom_attribute config_rom_attributes[] = {
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IMMEDIATE_ATTR(vendor, CSR_VENDOR),
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IMMEDIATE_ATTR(hardware_version, CSR_HARDWARE_VERSION),
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IMMEDIATE_ATTR(specifier_id, CSR_SPECIFIER_ID),
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IMMEDIATE_ATTR(version, CSR_VERSION),
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IMMEDIATE_ATTR(model, CSR_MODEL),
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TEXT_LEAF_ATTR(vendor_name, CSR_VENDOR),
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TEXT_LEAF_ATTR(model_name, CSR_MODEL),
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TEXT_LEAF_ATTR(hardware_version_name, CSR_HARDWARE_VERSION),
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};
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static void
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init_fw_attribute_group(struct device *dev,
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struct device_attribute *attrs,
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struct fw_attribute_group *group)
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{
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struct device_attribute *attr;
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int i, j;
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for (j = 0; attrs[j].attr.name != NULL; j++)
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group->attrs[j] = &attrs[j].attr;
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for (i = 0; i < ARRAY_SIZE(config_rom_attributes); i++) {
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attr = &config_rom_attributes[i].attr;
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if (attr->show(dev, attr, NULL) < 0)
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continue;
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group->attrs[j++] = &attr->attr;
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}
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BUG_ON(j >= ARRAY_SIZE(group->attrs));
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group->attrs[j++] = NULL;
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group->groups[0] = &group->group;
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group->groups[1] = NULL;
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group->group.attrs = group->attrs;
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dev->groups = group->groups;
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}
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static ssize_t
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modalias_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct fw_unit *unit = fw_unit(dev);
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int length;
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length = get_modalias(unit, buf, PAGE_SIZE);
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strcpy(buf + length, "\n");
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return length + 1;
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}
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static ssize_t
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rom_index_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct fw_device *device = fw_device(dev->parent);
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struct fw_unit *unit = fw_unit(dev);
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return snprintf(buf, PAGE_SIZE, "%d\n",
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(int)(unit->directory - device->config_rom));
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}
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static struct device_attribute fw_unit_attributes[] = {
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__ATTR_RO(modalias),
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__ATTR_RO(rom_index),
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__ATTR_NULL,
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};
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static ssize_t
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config_rom_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct fw_device *device = fw_device(dev);
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size_t length;
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down_read(&fw_device_rwsem);
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length = device->config_rom_length * 4;
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memcpy(buf, device->config_rom, length);
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up_read(&fw_device_rwsem);
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return length;
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}
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static ssize_t
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guid_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct fw_device *device = fw_device(dev);
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int ret;
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down_read(&fw_device_rwsem);
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ret = snprintf(buf, PAGE_SIZE, "0x%08x%08x\n",
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device->config_rom[3], device->config_rom[4]);
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up_read(&fw_device_rwsem);
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return ret;
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}
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static struct device_attribute fw_device_attributes[] = {
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__ATTR_RO(config_rom),
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__ATTR_RO(guid),
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__ATTR_NULL,
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};
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static int
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read_rom(struct fw_device *device, int generation, int index, u32 *data)
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{
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int rcode;
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/* device->node_id, accessed below, must not be older than generation */
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smp_rmb();
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rcode = fw_run_transaction(device->card, TCODE_READ_QUADLET_REQUEST,
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device->node_id, generation, device->max_speed,
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(CSR_REGISTER_BASE | CSR_CONFIG_ROM) + index * 4,
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data, 4);
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be32_to_cpus(data);
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return rcode;
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}
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|
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#define READ_BIB_ROM_SIZE 256
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#define READ_BIB_STACK_SIZE 16
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|
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/*
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* Read the bus info block, perform a speed probe, and read all of the rest of
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* the config ROM. We do all this with a cached bus generation. If the bus
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* generation changes under us, read_bus_info_block will fail and get retried.
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* It's better to start all over in this case because the node from which we
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* are reading the ROM may have changed the ROM during the reset.
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*/
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static int read_bus_info_block(struct fw_device *device, int generation)
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{
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u32 *rom, *stack, *old_rom, *new_rom;
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u32 sp, key;
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int i, end, length, ret = -1;
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|
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rom = kmalloc(sizeof(*rom) * READ_BIB_ROM_SIZE +
|
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sizeof(*stack) * READ_BIB_STACK_SIZE, GFP_KERNEL);
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if (rom == NULL)
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return -ENOMEM;
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|
|
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stack = &rom[READ_BIB_ROM_SIZE];
|
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|
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device->max_speed = SCODE_100;
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|
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/* First read the bus info block. */
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for (i = 0; i < 5; i++) {
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if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE)
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goto out;
|
|
/*
|
|
* As per IEEE1212 7.2, during power-up, devices can
|
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* reply with a 0 for the first quadlet of the config
|
|
* rom to indicate that they are booting (for example,
|
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* if the firmware is on the disk of a external
|
|
* harddisk). In that case we just fail, and the
|
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* retry mechanism will try again later.
|
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*/
|
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if (i == 0 && rom[i] == 0)
|
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goto out;
|
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}
|
|
|
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device->max_speed = device->node->max_speed;
|
|
|
|
/*
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* Determine the speed of
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* - devices with link speed less than PHY speed,
|
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* - devices with 1394b PHY (unless only connected to 1394a PHYs),
|
|
* - all devices if there are 1394b repeaters.
|
|
* Note, we cannot use the bus info block's link_spd as starting point
|
|
* because some buggy firmwares set it lower than necessary and because
|
|
* 1394-1995 nodes do not have the field.
|
|
*/
|
|
if ((rom[2] & 0x7) < device->max_speed ||
|
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device->max_speed == SCODE_BETA ||
|
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device->card->beta_repeaters_present) {
|
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u32 dummy;
|
|
|
|
/* for S1600 and S3200 */
|
|
if (device->max_speed == SCODE_BETA)
|
|
device->max_speed = device->card->link_speed;
|
|
|
|
while (device->max_speed > SCODE_100) {
|
|
if (read_rom(device, generation, 0, &dummy) ==
|
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RCODE_COMPLETE)
|
|
break;
|
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device->max_speed--;
|
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}
|
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}
|
|
|
|
/*
|
|
* Now parse the config rom. The config rom is a recursive
|
|
* directory structure so we parse it using a stack of
|
|
* references to the blocks that make up the structure. We
|
|
* push a reference to the root directory on the stack to
|
|
* start things off.
|
|
*/
|
|
length = i;
|
|
sp = 0;
|
|
stack[sp++] = 0xc0000005;
|
|
while (sp > 0) {
|
|
/*
|
|
* Pop the next block reference of the stack. The
|
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* lower 24 bits is the offset into the config rom,
|
|
* the upper 8 bits are the type of the reference the
|
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* block.
|
|
*/
|
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key = stack[--sp];
|
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i = key & 0xffffff;
|
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if (i >= READ_BIB_ROM_SIZE)
|
|
/*
|
|
* The reference points outside the standard
|
|
* config rom area, something's fishy.
|
|
*/
|
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goto out;
|
|
|
|
/* Read header quadlet for the block to get the length. */
|
|
if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE)
|
|
goto out;
|
|
end = i + (rom[i] >> 16) + 1;
|
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i++;
|
|
if (end > READ_BIB_ROM_SIZE)
|
|
/*
|
|
* This block extends outside standard config
|
|
* area (and the array we're reading it
|
|
* into). That's broken, so ignore this
|
|
* device.
|
|
*/
|
|
goto out;
|
|
|
|
/*
|
|
* Now read in the block. If this is a directory
|
|
* block, check the entries as we read them to see if
|
|
* it references another block, and push it in that case.
|
|
*/
|
|
while (i < end) {
|
|
if (read_rom(device, generation, i, &rom[i]) !=
|
|
RCODE_COMPLETE)
|
|
goto out;
|
|
if ((key >> 30) == 3 && (rom[i] >> 30) > 1 &&
|
|
sp < READ_BIB_STACK_SIZE)
|
|
stack[sp++] = i + rom[i];
|
|
i++;
|
|
}
|
|
if (length < i)
|
|
length = i;
|
|
}
|
|
|
|
old_rom = device->config_rom;
|
|
new_rom = kmemdup(rom, length * 4, GFP_KERNEL);
|
|
if (new_rom == NULL)
|
|
goto out;
|
|
|
|
down_write(&fw_device_rwsem);
|
|
device->config_rom = new_rom;
|
|
device->config_rom_length = length;
|
|
up_write(&fw_device_rwsem);
|
|
|
|
kfree(old_rom);
|
|
ret = 0;
|
|
device->cmc = rom[2] & 1 << 30;
|
|
out:
|
|
kfree(rom);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void fw_unit_release(struct device *dev)
|
|
{
|
|
struct fw_unit *unit = fw_unit(dev);
|
|
|
|
kfree(unit);
|
|
}
|
|
|
|
static struct device_type fw_unit_type = {
|
|
.uevent = fw_unit_uevent,
|
|
.release = fw_unit_release,
|
|
};
|
|
|
|
static int is_fw_unit(struct device *dev)
|
|
{
|
|
return dev->type == &fw_unit_type;
|
|
}
|
|
|
|
static void create_units(struct fw_device *device)
|
|
{
|
|
struct fw_csr_iterator ci;
|
|
struct fw_unit *unit;
|
|
int key, value, i;
|
|
|
|
i = 0;
|
|
fw_csr_iterator_init(&ci, &device->config_rom[5]);
|
|
while (fw_csr_iterator_next(&ci, &key, &value)) {
|
|
if (key != (CSR_UNIT | CSR_DIRECTORY))
|
|
continue;
|
|
|
|
/*
|
|
* Get the address of the unit directory and try to
|
|
* match the drivers id_tables against it.
|
|
*/
|
|
unit = kzalloc(sizeof(*unit), GFP_KERNEL);
|
|
if (unit == NULL) {
|
|
fw_error("failed to allocate memory for unit\n");
|
|
continue;
|
|
}
|
|
|
|
unit->directory = ci.p + value - 1;
|
|
unit->device.bus = &fw_bus_type;
|
|
unit->device.type = &fw_unit_type;
|
|
unit->device.parent = &device->device;
|
|
snprintf(unit->device.bus_id, sizeof(unit->device.bus_id),
|
|
"%s.%d", device->device.bus_id, i++);
|
|
|
|
init_fw_attribute_group(&unit->device,
|
|
fw_unit_attributes,
|
|
&unit->attribute_group);
|
|
if (device_register(&unit->device) < 0)
|
|
goto skip_unit;
|
|
|
|
continue;
|
|
|
|
skip_unit:
|
|
kfree(unit);
|
|
}
|
|
}
|
|
|
|
static int shutdown_unit(struct device *device, void *data)
|
|
{
|
|
device_unregister(device);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* fw_device_rwsem acts as dual purpose mutex:
|
|
* - serializes accesses to fw_device_idr,
|
|
* - serializes accesses to fw_device.config_rom/.config_rom_length and
|
|
* fw_unit.directory, unless those accesses happen at safe occasions
|
|
*/
|
|
DECLARE_RWSEM(fw_device_rwsem);
|
|
|
|
static DEFINE_IDR(fw_device_idr);
|
|
int fw_cdev_major;
|
|
|
|
struct fw_device *fw_device_get_by_devt(dev_t devt)
|
|
{
|
|
struct fw_device *device;
|
|
|
|
down_read(&fw_device_rwsem);
|
|
device = idr_find(&fw_device_idr, MINOR(devt));
|
|
if (device)
|
|
fw_device_get(device);
|
|
up_read(&fw_device_rwsem);
|
|
|
|
return device;
|
|
}
|
|
|
|
static void fw_device_shutdown(struct work_struct *work)
|
|
{
|
|
struct fw_device *device =
|
|
container_of(work, struct fw_device, work.work);
|
|
int minor = MINOR(device->device.devt);
|
|
|
|
fw_device_cdev_remove(device);
|
|
device_for_each_child(&device->device, NULL, shutdown_unit);
|
|
device_unregister(&device->device);
|
|
|
|
down_write(&fw_device_rwsem);
|
|
idr_remove(&fw_device_idr, minor);
|
|
up_write(&fw_device_rwsem);
|
|
fw_device_put(device);
|
|
}
|
|
|
|
static struct device_type fw_device_type = {
|
|
.release = fw_device_release,
|
|
};
|
|
|
|
/*
|
|
* These defines control the retry behavior for reading the config
|
|
* rom. It shouldn't be necessary to tweak these; if the device
|
|
* doesn't respond to a config rom read within 10 seconds, it's not
|
|
* going to respond at all. As for the initial delay, a lot of
|
|
* devices will be able to respond within half a second after bus
|
|
* reset. On the other hand, it's not really worth being more
|
|
* aggressive than that, since it scales pretty well; if 10 devices
|
|
* are plugged in, they're all getting read within one second.
|
|
*/
|
|
|
|
#define MAX_RETRIES 10
|
|
#define RETRY_DELAY (3 * HZ)
|
|
#define INITIAL_DELAY (HZ / 2)
|
|
|
|
static void fw_device_init(struct work_struct *work)
|
|
{
|
|
struct fw_device *device =
|
|
container_of(work, struct fw_device, work.work);
|
|
int minor, err;
|
|
|
|
/*
|
|
* All failure paths here set node->data to NULL, so that we
|
|
* don't try to do device_for_each_child() on a kfree()'d
|
|
* device.
|
|
*/
|
|
|
|
if (read_bus_info_block(device, device->generation) < 0) {
|
|
if (device->config_rom_retries < MAX_RETRIES &&
|
|
atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
|
|
device->config_rom_retries++;
|
|
schedule_delayed_work(&device->work, RETRY_DELAY);
|
|
} else {
|
|
fw_notify("giving up on config rom for node id %x\n",
|
|
device->node_id);
|
|
if (device->node == device->card->root_node)
|
|
schedule_delayed_work(&device->card->work, 0);
|
|
fw_device_release(&device->device);
|
|
}
|
|
return;
|
|
}
|
|
|
|
err = -ENOMEM;
|
|
|
|
fw_device_get(device);
|
|
down_write(&fw_device_rwsem);
|
|
if (idr_pre_get(&fw_device_idr, GFP_KERNEL))
|
|
err = idr_get_new(&fw_device_idr, device, &minor);
|
|
up_write(&fw_device_rwsem);
|
|
|
|
if (err < 0)
|
|
goto error;
|
|
|
|
device->device.bus = &fw_bus_type;
|
|
device->device.type = &fw_device_type;
|
|
device->device.parent = device->card->device;
|
|
device->device.devt = MKDEV(fw_cdev_major, minor);
|
|
snprintf(device->device.bus_id, sizeof(device->device.bus_id),
|
|
"fw%d", minor);
|
|
|
|
init_fw_attribute_group(&device->device,
|
|
fw_device_attributes,
|
|
&device->attribute_group);
|
|
if (device_add(&device->device)) {
|
|
fw_error("Failed to add device.\n");
|
|
goto error_with_cdev;
|
|
}
|
|
|
|
create_units(device);
|
|
|
|
/*
|
|
* Transition the device to running state. If it got pulled
|
|
* out from under us while we did the intialization work, we
|
|
* have to shut down the device again here. Normally, though,
|
|
* fw_node_event will be responsible for shutting it down when
|
|
* necessary. We have to use the atomic cmpxchg here to avoid
|
|
* racing with the FW_NODE_DESTROYED case in
|
|
* fw_node_event().
|
|
*/
|
|
if (atomic_cmpxchg(&device->state,
|
|
FW_DEVICE_INITIALIZING,
|
|
FW_DEVICE_RUNNING) == FW_DEVICE_SHUTDOWN) {
|
|
fw_device_shutdown(work);
|
|
} else {
|
|
if (device->config_rom_retries)
|
|
fw_notify("created device %s: GUID %08x%08x, S%d00, "
|
|
"%d config ROM retries\n",
|
|
device->device.bus_id,
|
|
device->config_rom[3], device->config_rom[4],
|
|
1 << device->max_speed,
|
|
device->config_rom_retries);
|
|
else
|
|
fw_notify("created device %s: GUID %08x%08x, S%d00\n",
|
|
device->device.bus_id,
|
|
device->config_rom[3], device->config_rom[4],
|
|
1 << device->max_speed);
|
|
device->config_rom_retries = 0;
|
|
}
|
|
|
|
/*
|
|
* Reschedule the IRM work if we just finished reading the
|
|
* root node config rom. If this races with a bus reset we
|
|
* just end up running the IRM work a couple of extra times -
|
|
* pretty harmless.
|
|
*/
|
|
if (device->node == device->card->root_node)
|
|
schedule_delayed_work(&device->card->work, 0);
|
|
|
|
return;
|
|
|
|
error_with_cdev:
|
|
down_write(&fw_device_rwsem);
|
|
idr_remove(&fw_device_idr, minor);
|
|
up_write(&fw_device_rwsem);
|
|
error:
|
|
fw_device_put(device); /* fw_device_idr's reference */
|
|
|
|
put_device(&device->device); /* our reference */
|
|
}
|
|
|
|
static int update_unit(struct device *dev, void *data)
|
|
{
|
|
struct fw_unit *unit = fw_unit(dev);
|
|
struct fw_driver *driver = (struct fw_driver *)dev->driver;
|
|
|
|
if (is_fw_unit(dev) && driver != NULL && driver->update != NULL) {
|
|
down(&dev->sem);
|
|
driver->update(unit);
|
|
up(&dev->sem);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void fw_device_update(struct work_struct *work)
|
|
{
|
|
struct fw_device *device =
|
|
container_of(work, struct fw_device, work.work);
|
|
|
|
fw_device_cdev_update(device);
|
|
device_for_each_child(&device->device, NULL, update_unit);
|
|
}
|
|
|
|
enum {
|
|
REREAD_BIB_ERROR,
|
|
REREAD_BIB_GONE,
|
|
REREAD_BIB_UNCHANGED,
|
|
REREAD_BIB_CHANGED,
|
|
};
|
|
|
|
/* Reread and compare bus info block and header of root directory */
|
|
static int reread_bus_info_block(struct fw_device *device, int generation)
|
|
{
|
|
u32 q;
|
|
int i;
|
|
|
|
for (i = 0; i < 6; i++) {
|
|
if (read_rom(device, generation, i, &q) != RCODE_COMPLETE)
|
|
return REREAD_BIB_ERROR;
|
|
|
|
if (i == 0 && q == 0)
|
|
return REREAD_BIB_GONE;
|
|
|
|
if (i > device->config_rom_length || q != device->config_rom[i])
|
|
return REREAD_BIB_CHANGED;
|
|
}
|
|
|
|
return REREAD_BIB_UNCHANGED;
|
|
}
|
|
|
|
static void fw_device_refresh(struct work_struct *work)
|
|
{
|
|
struct fw_device *device =
|
|
container_of(work, struct fw_device, work.work);
|
|
struct fw_card *card = device->card;
|
|
int node_id = device->node_id;
|
|
|
|
switch (reread_bus_info_block(device, device->generation)) {
|
|
case REREAD_BIB_ERROR:
|
|
if (device->config_rom_retries < MAX_RETRIES / 2 &&
|
|
atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
|
|
device->config_rom_retries++;
|
|
schedule_delayed_work(&device->work, RETRY_DELAY / 2);
|
|
|
|
return;
|
|
}
|
|
goto give_up;
|
|
|
|
case REREAD_BIB_GONE:
|
|
goto gone;
|
|
|
|
case REREAD_BIB_UNCHANGED:
|
|
if (atomic_cmpxchg(&device->state,
|
|
FW_DEVICE_INITIALIZING,
|
|
FW_DEVICE_RUNNING) == FW_DEVICE_SHUTDOWN)
|
|
goto gone;
|
|
|
|
fw_device_update(work);
|
|
device->config_rom_retries = 0;
|
|
goto out;
|
|
|
|
case REREAD_BIB_CHANGED:
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Something changed. We keep things simple and don't investigate
|
|
* further. We just destroy all previous units and create new ones.
|
|
*/
|
|
device_for_each_child(&device->device, NULL, shutdown_unit);
|
|
|
|
if (read_bus_info_block(device, device->generation) < 0) {
|
|
if (device->config_rom_retries < MAX_RETRIES &&
|
|
atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
|
|
device->config_rom_retries++;
|
|
schedule_delayed_work(&device->work, RETRY_DELAY);
|
|
|
|
return;
|
|
}
|
|
goto give_up;
|
|
}
|
|
|
|
create_units(device);
|
|
|
|
if (atomic_cmpxchg(&device->state,
|
|
FW_DEVICE_INITIALIZING,
|
|
FW_DEVICE_RUNNING) == FW_DEVICE_SHUTDOWN)
|
|
goto gone;
|
|
|
|
fw_notify("refreshed device %s\n", device->device.bus_id);
|
|
device->config_rom_retries = 0;
|
|
goto out;
|
|
|
|
give_up:
|
|
fw_notify("giving up on refresh of device %s\n", device->device.bus_id);
|
|
gone:
|
|
atomic_set(&device->state, FW_DEVICE_SHUTDOWN);
|
|
fw_device_shutdown(work);
|
|
out:
|
|
if (node_id == card->root_node->node_id)
|
|
schedule_delayed_work(&card->work, 0);
|
|
}
|
|
|
|
void fw_node_event(struct fw_card *card, struct fw_node *node, int event)
|
|
{
|
|
struct fw_device *device;
|
|
|
|
switch (event) {
|
|
case FW_NODE_CREATED:
|
|
case FW_NODE_LINK_ON:
|
|
if (!node->link_on)
|
|
break;
|
|
create:
|
|
device = kzalloc(sizeof(*device), GFP_ATOMIC);
|
|
if (device == NULL)
|
|
break;
|
|
|
|
/*
|
|
* Do minimal intialization of the device here, the
|
|
* rest will happen in fw_device_init(). We need the
|
|
* card and node so we can read the config rom and we
|
|
* need to do device_initialize() now so
|
|
* device_for_each_child() in FW_NODE_UPDATED is
|
|
* doesn't freak out.
|
|
*/
|
|
device_initialize(&device->device);
|
|
atomic_set(&device->state, FW_DEVICE_INITIALIZING);
|
|
device->card = fw_card_get(card);
|
|
device->node = fw_node_get(node);
|
|
device->node_id = node->node_id;
|
|
device->generation = card->generation;
|
|
INIT_LIST_HEAD(&device->client_list);
|
|
|
|
/*
|
|
* Set the node data to point back to this device so
|
|
* FW_NODE_UPDATED callbacks can update the node_id
|
|
* and generation for the device.
|
|
*/
|
|
node->data = device;
|
|
|
|
/*
|
|
* Many devices are slow to respond after bus resets,
|
|
* especially if they are bus powered and go through
|
|
* power-up after getting plugged in. We schedule the
|
|
* first config rom scan half a second after bus reset.
|
|
*/
|
|
INIT_DELAYED_WORK(&device->work, fw_device_init);
|
|
schedule_delayed_work(&device->work, INITIAL_DELAY);
|
|
break;
|
|
|
|
case FW_NODE_INITIATED_RESET:
|
|
device = node->data;
|
|
if (device == NULL)
|
|
goto create;
|
|
|
|
device->node_id = node->node_id;
|
|
smp_wmb(); /* update node_id before generation */
|
|
device->generation = card->generation;
|
|
if (atomic_cmpxchg(&device->state,
|
|
FW_DEVICE_RUNNING,
|
|
FW_DEVICE_INITIALIZING) == FW_DEVICE_RUNNING) {
|
|
PREPARE_DELAYED_WORK(&device->work, fw_device_refresh);
|
|
schedule_delayed_work(&device->work,
|
|
node == card->local_node ? 0 : INITIAL_DELAY);
|
|
}
|
|
break;
|
|
|
|
case FW_NODE_UPDATED:
|
|
if (!node->link_on || node->data == NULL)
|
|
break;
|
|
|
|
device = node->data;
|
|
device->node_id = node->node_id;
|
|
smp_wmb(); /* update node_id before generation */
|
|
device->generation = card->generation;
|
|
if (atomic_read(&device->state) == FW_DEVICE_RUNNING) {
|
|
PREPARE_DELAYED_WORK(&device->work, fw_device_update);
|
|
schedule_delayed_work(&device->work, 0);
|
|
}
|
|
break;
|
|
|
|
case FW_NODE_DESTROYED:
|
|
case FW_NODE_LINK_OFF:
|
|
if (!node->data)
|
|
break;
|
|
|
|
/*
|
|
* Destroy the device associated with the node. There
|
|
* are two cases here: either the device is fully
|
|
* initialized (FW_DEVICE_RUNNING) or we're in the
|
|
* process of reading its config rom
|
|
* (FW_DEVICE_INITIALIZING). If it is fully
|
|
* initialized we can reuse device->work to schedule a
|
|
* full fw_device_shutdown(). If not, there's work
|
|
* scheduled to read it's config rom, and we just put
|
|
* the device in shutdown state to have that code fail
|
|
* to create the device.
|
|
*/
|
|
device = node->data;
|
|
if (atomic_xchg(&device->state,
|
|
FW_DEVICE_SHUTDOWN) == FW_DEVICE_RUNNING) {
|
|
PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown);
|
|
schedule_delayed_work(&device->work, 0);
|
|
}
|
|
break;
|
|
}
|
|
}
|