![Kristian Høgsberg](/assets/img/avatar_default.png)
This serializes the update callback with the probe and remove callback from the driver core and prevents remove from being called while update is running for the same device. Signed-off-by: Kristian Høgsberg <krh@redhat.com> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
661 lines
18 KiB
C
661 lines
18 KiB
C
/* -*- c-basic-offset: 8 -*-
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*
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* fw-device.c - 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 "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, char **envp, int num_envp,
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char *buffer, int buffer_size)
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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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int length = 0;
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int i = 0;
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if (!is_fw_unit(dev))
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goto out;
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get_modalias(unit, modalias, sizeof modalias);
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if (add_uevent_var(envp, num_envp, &i,
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buffer, buffer_size, &length,
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"MODALIAS=%s", modalias))
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return -ENOMEM;
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out:
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envp[i] = NULL;
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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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.uevent = fw_unit_uevent,
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};
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EXPORT_SYMBOL(fw_bus_type);
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extern struct fw_device *fw_device_get(struct fw_device *device)
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{
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get_device(&device->device);
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return device;
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}
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extern void fw_device_put(struct fw_device *device)
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{
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put_device(&device->device);
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}
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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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unsigned long flags;
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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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spin_lock_irqsave(&device->card->lock, flags);
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device->node->data = NULL;
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spin_unlock_irqrestore(&device->card->lock, flags);
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fw_node_put(device->node);
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fw_card_put(device->card);
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kfree(device->config_rom);
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kfree(device);
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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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return device->card->driver->enable_phys_dma(device->card,
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device->node_id,
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device->generation);
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}
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EXPORT_SYMBOL(fw_device_enable_phys_dma);
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static ssize_t
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show_modalias_attribute(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 struct device_attribute modalias_attribute = {
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.attr = { .name = "modalias", .mode = S_IRUGO, },
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.show = show_modalias_attribute,
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};
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static ssize_t
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show_config_rom_attribute(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);
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memcpy(buf, device->config_rom, device->config_rom_length * 4);
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return device->config_rom_length * 4;
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}
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static struct device_attribute config_rom_attribute = {
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.attr = {.name = "config_rom", .mode = S_IRUGO,},
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.show = show_config_rom_attribute,
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};
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static ssize_t
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show_rom_index_attribute(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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unit->directory - device->config_rom);
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}
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static struct device_attribute rom_index_attribute = {
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.attr = { .name = "rom_index", .mode = S_IRUGO, },
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.show = show_rom_index_attribute,
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};
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struct read_quadlet_callback_data {
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struct completion done;
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int rcode;
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u32 data;
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};
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static void
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complete_transaction(struct fw_card *card, int rcode,
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void *payload, size_t length, void *data)
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{
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struct read_quadlet_callback_data *callback_data = data;
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if (rcode == RCODE_COMPLETE)
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callback_data->data = be32_to_cpu(*(__be32 *)payload);
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callback_data->rcode = rcode;
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complete(&callback_data->done);
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}
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static int read_rom(struct fw_device *device, int index, u32 * data)
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{
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struct read_quadlet_callback_data callback_data;
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struct fw_transaction t;
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u64 offset;
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init_completion(&callback_data.done);
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offset = 0xfffff0000400ULL + index * 4;
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fw_send_request(device->card, &t, TCODE_READ_QUADLET_REQUEST,
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device->node_id,
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device->generation, SCODE_100,
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offset, NULL, 4, complete_transaction, &callback_data);
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wait_for_completion(&callback_data.done);
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*data = callback_data.data;
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return callback_data.rcode;
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}
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static int read_bus_info_block(struct fw_device *device)
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{
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static u32 rom[256];
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u32 stack[16], sp, key;
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int i, end, length;
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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, i, &rom[i]) != RCODE_COMPLETE)
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return -1;
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/* 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
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* rom to indicate that they are booting (for example,
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* if the firmware is on the disk of a external
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* harddisk). In that case we just fail, and the
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* retry mechanism will try again later. */
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if (i == 0 && rom[i] == 0)
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return -1;
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}
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/* Now parse the config rom. The config rom is a recursive
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* directory structure so we parse it using a stack of
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* references to the blocks that make up the structure. We
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* push a reference to the root directory on the stack to
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* start things off. */
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length = i;
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sp = 0;
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stack[sp++] = 0xc0000005;
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while (sp > 0) {
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/* Pop the next block reference of the stack. The
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* lower 24 bits is the offset into the config rom,
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* 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 >= ARRAY_SIZE(rom))
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/* The reference points outside the standard
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* config rom area, something's fishy. */
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return -1;
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/* Read header quadlet for the block to get the length. */
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if (read_rom(device, i, &rom[i]) != RCODE_COMPLETE)
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return -1;
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end = i + (rom[i] >> 16) + 1;
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i++;
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if (end > ARRAY_SIZE(rom))
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/* This block extends outside standard config
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* area (and the array we're reading it
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* into). That's broken, so ignore this
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* device. */
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return -1;
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/* Now read in the block. If this is a directory
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* block, check the entries as we read them to see if
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* it references another block, and push it in that case. */
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while (i < end) {
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if (read_rom(device, i, &rom[i]) != RCODE_COMPLETE)
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return -1;
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if ((key >> 30) == 3 && (rom[i] >> 30) > 1 &&
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sp < ARRAY_SIZE(stack))
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stack[sp++] = i + rom[i];
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i++;
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}
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if (length < i)
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length = i;
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}
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device->config_rom = kmalloc(length * 4, GFP_KERNEL);
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if (device->config_rom == NULL)
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return -1;
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memcpy(device->config_rom, rom, length * 4);
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device->config_rom_length = length;
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return 0;
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}
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static void fw_unit_release(struct device *dev)
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{
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struct fw_unit *unit = fw_unit(dev);
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kfree(unit);
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}
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static int is_fw_unit(struct device *dev)
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{
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return dev->release == fw_unit_release;
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}
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static void create_units(struct fw_device *device)
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{
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struct fw_csr_iterator ci;
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struct fw_unit *unit;
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int key, value, i;
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i = 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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if (key != (CSR_UNIT | CSR_DIRECTORY))
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continue;
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/* Get the address of the unit directory and try to
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* match the drivers id_tables against it. */
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unit = kzalloc(sizeof *unit, GFP_KERNEL);
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if (unit == NULL) {
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fw_error("failed to allocate memory for unit\n");
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continue;
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}
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unit->directory = ci.p + value - 1;
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unit->device.bus = &fw_bus_type;
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unit->device.release = fw_unit_release;
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unit->device.parent = &device->device;
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snprintf(unit->device.bus_id, sizeof unit->device.bus_id,
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"%s.%d", device->device.bus_id, i++);
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if (device_register(&unit->device) < 0) {
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kfree(unit);
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continue;
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}
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if (device_create_file(&unit->device, &modalias_attribute) < 0) {
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device_unregister(&unit->device);
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kfree(unit);
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}
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if (device_create_file(&unit->device, &rom_index_attribute) < 0) {
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device_unregister(&unit->device);
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kfree(unit);
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}
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}
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}
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static int shutdown_unit(struct device *device, void *data)
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{
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struct fw_unit *unit = fw_unit(device);
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if (is_fw_unit(device)) {
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device_remove_file(&unit->device, &modalias_attribute);
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device_unregister(&unit->device);
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}
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return 0;
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}
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static DEFINE_IDR(fw_device_idr);
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int fw_cdev_major;
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struct fw_device *fw_device_from_devt(dev_t devt)
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{
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struct fw_device *device;
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down_read(&fw_bus_type.subsys.rwsem);
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device = idr_find(&fw_device_idr, MINOR(devt));
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up_read(&fw_bus_type.subsys.rwsem);
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return device;
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}
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static void fw_device_shutdown(struct work_struct *work)
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{
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struct fw_device *device =
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container_of(work, struct fw_device, work.work);
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int minor = MINOR(device->device.devt);
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down_write(&fw_bus_type.subsys.rwsem);
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idr_remove(&fw_device_idr, minor);
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up_write(&fw_bus_type.subsys.rwsem);
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fw_device_cdev_remove(device);
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device_remove_file(&device->device, &config_rom_attribute);
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device_for_each_child(&device->device, NULL, shutdown_unit);
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device_unregister(&device->device);
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}
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/* These defines control the retry behavior for reading the config
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* rom. It shouldn't be necessary to tweak these; if the device
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* doesn't respond to a config rom read within 10 seconds, it's not
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* going to respond at all. As for the initial delay, a lot of
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* devices will be able to respond within half a second after bus
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* reset. On the other hand, it's not really worth being more
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* aggressive than that, since it scales pretty well; if 10 devices
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* are plugged in, they're all getting read within one second. */
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#define MAX_RETRIES 5
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#define RETRY_DELAY (2 * HZ)
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#define INITIAL_DELAY (HZ / 2)
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static void fw_device_init(struct work_struct *work)
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{
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struct fw_device *device =
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container_of(work, struct fw_device, work.work);
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int minor, err;
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/* All failure paths here set node->data to NULL, so that we
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* don't try to do device_for_each_child() on a kfree()'d
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* device. */
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if (read_bus_info_block(device) < 0) {
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if (device->config_rom_retries < MAX_RETRIES) {
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device->config_rom_retries++;
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schedule_delayed_work(&device->work, RETRY_DELAY);
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} else {
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fw_notify("giving up on config rom for node id %x\n",
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device->node_id);
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if (device->node == device->card->root_node)
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schedule_delayed_work(&device->card->work, 0);
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fw_device_release(&device->device);
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}
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return;
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}
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err = -ENOMEM;
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down_write(&fw_bus_type.subsys.rwsem);
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if (idr_pre_get(&fw_device_idr, GFP_KERNEL))
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err = idr_get_new(&fw_device_idr, device, &minor);
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up_write(&fw_bus_type.subsys.rwsem);
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if (err < 0)
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goto error;
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device->device.bus = &fw_bus_type;
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device->device.release = fw_device_release;
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device->device.parent = device->card->device;
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device->device.devt = MKDEV(fw_cdev_major, minor);
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snprintf(device->device.bus_id, sizeof device->device.bus_id,
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"fw%d", minor);
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if (device_add(&device->device)) {
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|
fw_error("Failed to add device.\n");
|
|
goto error_with_cdev;
|
|
}
|
|
|
|
if (device_create_file(&device->device, &config_rom_attribute) < 0) {
|
|
fw_error("Failed to create config rom file.\n");
|
|
goto error_with_device;
|
|
}
|
|
|
|
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(&device->work.work);
|
|
else
|
|
fw_notify("created new fw device %s (%d config rom retries)\n",
|
|
device->device.bus_id, device->config_rom_retries);
|
|
|
|
/* 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_device:
|
|
device_del(&device->device);
|
|
error_with_cdev:
|
|
down_write(&fw_bus_type.subsys.rwsem);
|
|
idr_remove(&fw_device_idr, minor);
|
|
up_write(&fw_bus_type.subsys.rwsem);
|
|
error:
|
|
put_device(&device->device);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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;
|
|
|
|
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_UPDATED:
|
|
if (!node->link_on || node->data == NULL)
|
|
break;
|
|
|
|
device = node->data;
|
|
device->node_id = node->node_id;
|
|
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;
|
|
}
|
|
}
|