firewire: reread config ROM when device reset the bus
When a device changes its configuration ROM, it announces this with a
bus reset. firewire-core has to check which node initiated a bus reset
and whether any unit directories went away or were added on this node.
Tested with an IOI FWB-IDE01AB which has its link-on bit set if bus
power is available but does not respond to ROM read requests if self
power is off. This implements
- recognition of the units if self power is switched on after fw-core
gave up the initial attempt to read the config ROM,
- shutdown of the units when self power is switched off.
Also tested with a second PC running Linux/ieee1394. When the eth1394
driver is inserted and removed on that node, fw-core now notices the
addition and removal of the IPv4 unit on the ieee1394 node.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
This commit is contained in:
Stefan Richter
parent
1dadff71d6
commit
c9755e14a0
7 changed files with 223 additions and 47 deletions
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@ -331,7 +331,7 @@ fw_card_bm_work(struct work_struct *work)
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*/
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spin_unlock_irqrestore(&card->lock, flags);
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goto out;
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} else if (root_device->config_rom[2] & BIB_CMC) {
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} else if (root_device->cmc) {
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/*
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* FIXME: I suppose we should set the cmstr bit in the
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* STATE_CLEAR register of this node, as described in
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@ -269,21 +269,28 @@ static int ioctl_get_info(struct client *client, void *buffer)
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{
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struct fw_cdev_get_info *get_info = buffer;
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struct fw_cdev_event_bus_reset bus_reset;
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unsigned long ret = 0;
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client->version = get_info->version;
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get_info->version = FW_CDEV_VERSION;
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down_read(&fw_device_rwsem);
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if (get_info->rom != 0) {
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void __user *uptr = u64_to_uptr(get_info->rom);
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size_t want = get_info->rom_length;
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size_t have = client->device->config_rom_length * 4;
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if (copy_to_user(uptr, client->device->config_rom,
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min(want, have)))
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return -EFAULT;
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ret = copy_to_user(uptr, client->device->config_rom,
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min(want, have));
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}
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get_info->rom_length = client->device->config_rom_length * 4;
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up_read(&fw_device_rwsem);
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if (ret != 0)
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return -EFAULT;
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client->bus_reset_closure = get_info->bus_reset_closure;
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if (get_info->bus_reset != 0) {
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void __user *uptr = u64_to_uptr(get_info->bus_reset);
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@ -25,7 +25,7 @@
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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/rwsem.h>
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#include <linux/string.h>
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#include <asm/semaphore.h>
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#include <asm/system.h>
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#include <linux/ctype.h>
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@ -160,9 +160,9 @@ static void fw_device_release(struct device *dev)
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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(&device->card->lock, flags);
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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(&device->card->lock, flags);
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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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@ -195,7 +195,9 @@ show_immediate(struct device *dev, struct device_attribute *dattr, char *buf)
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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;
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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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@ -204,11 +206,15 @@ show_immediate(struct device *dev, struct device_attribute *dattr, char *buf)
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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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return snprintf(buf, buf ? PAGE_SIZE : 0,
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"0x%06x\n", 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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return -ENOENT;
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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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@ -221,9 +227,11 @@ show_text_leaf(struct device *dev, struct device_attribute *dattr, char *buf)
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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;
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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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@ -238,18 +246,20 @@ show_text_leaf(struct device *dev, struct device_attribute *dattr, char *buf)
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}
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if (block == NULL)
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return -ENOENT;
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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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return -ENOENT;
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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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return -ENOENT;
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goto out;
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if (buf == NULL)
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return length * 4;
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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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@ -259,8 +269,11 @@ show_text_leaf(struct device *dev, struct device_attribute *dattr, char *buf)
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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 b + 2 - buf;
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return ret;
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}
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#define TEXT_LEAF_ATTR(name, key) \
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@ -337,19 +350,28 @@ 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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memcpy(buf, device->config_rom, device->config_rom_length * 4);
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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 device->config_rom_length * 4;
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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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return snprintf(buf, PAGE_SIZE, "0x%08x%08x\n",
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device->config_rom[3], device->config_rom[4]);
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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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@ -412,7 +434,7 @@ read_rom(struct fw_device *device, int generation, int index, u32 *data)
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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;
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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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@ -527,12 +549,19 @@ static int read_bus_info_block(struct fw_device *device, int generation)
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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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old_rom = device->config_rom;
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new_rom = kmemdup(rom, length * 4, GFP_KERNEL);
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if (new_rom == NULL)
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goto out;
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memcpy(device->config_rom, rom, length * 4);
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down_write(&fw_device_rwsem);
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device->config_rom = new_rom;
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device->config_rom_length = length;
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up_write(&fw_device_rwsem);
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kfree(old_rom);
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ret = 0;
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device->cmc = rom[2] & 1 << 30;
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out:
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kfree(rom);
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@ -605,7 +634,14 @@ static int shutdown_unit(struct device *device, void *data)
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return 0;
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}
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static DECLARE_RWSEM(idr_rwsem);
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/*
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* fw_device_rwsem acts as dual purpose mutex:
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* - serializes accesses to fw_device_idr,
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* - serializes accesses to fw_device.config_rom/.config_rom_length and
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* fw_unit.directory, unless those accesses happen at safe occasions
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*/
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DECLARE_RWSEM(fw_device_rwsem);
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static DEFINE_IDR(fw_device_idr);
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int fw_cdev_major;
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@ -613,11 +649,11 @@ struct fw_device *fw_device_get_by_devt(dev_t devt)
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{
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struct fw_device *device;
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down_read(&idr_rwsem);
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down_read(&fw_device_rwsem);
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device = idr_find(&fw_device_idr, MINOR(devt));
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if (device)
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fw_device_get(device);
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up_read(&idr_rwsem);
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up_read(&fw_device_rwsem);
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return device;
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}
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@ -632,9 +668,9 @@ static void fw_device_shutdown(struct work_struct *work)
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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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down_write(&idr_rwsem);
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down_write(&fw_device_rwsem);
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idr_remove(&fw_device_idr, minor);
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up_write(&idr_rwsem);
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up_write(&fw_device_rwsem);
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fw_device_put(device);
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}
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@ -687,10 +723,10 @@ static void fw_device_init(struct work_struct *work)
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err = -ENOMEM;
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fw_device_get(device);
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down_write(&idr_rwsem);
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down_write(&fw_device_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(&idr_rwsem);
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up_write(&fw_device_rwsem);
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if (err < 0)
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goto error;
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@ -724,7 +760,7 @@ static void fw_device_init(struct work_struct *work)
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if (atomic_cmpxchg(&device->state,
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FW_DEVICE_INITIALIZING,
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FW_DEVICE_RUNNING) == FW_DEVICE_SHUTDOWN) {
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fw_device_shutdown(&device->work.work);
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fw_device_shutdown(work);
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} else {
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if (device->config_rom_retries)
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fw_notify("created device %s: GUID %08x%08x, S%d00, "
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@ -738,6 +774,7 @@ static void fw_device_init(struct work_struct *work)
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device->device.bus_id,
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device->config_rom[3], device->config_rom[4],
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1 << device->max_speed);
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device->config_rom_retries = 0;
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}
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/*
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@ -752,9 +789,9 @@ static void fw_device_init(struct work_struct *work)
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return;
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error_with_cdev:
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down_write(&idr_rwsem);
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down_write(&fw_device_rwsem);
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idr_remove(&fw_device_idr, minor);
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up_write(&idr_rwsem);
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up_write(&fw_device_rwsem);
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error:
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fw_device_put(device); /* fw_device_idr's reference */
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@ -784,6 +821,106 @@ static void fw_device_update(struct work_struct *work)
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device_for_each_child(&device->device, NULL, update_unit);
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}
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enum {
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REREAD_BIB_ERROR,
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REREAD_BIB_GONE,
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REREAD_BIB_UNCHANGED,
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REREAD_BIB_CHANGED,
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};
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/* Reread and compare bus info block and header of root directory */
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static int reread_bus_info_block(struct fw_device *device, int generation)
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{
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u32 q;
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int i;
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for (i = 0; i < 6; i++) {
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if (read_rom(device, generation, i, &q) != RCODE_COMPLETE)
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return REREAD_BIB_ERROR;
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if (i == 0 && q == 0)
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return REREAD_BIB_GONE;
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if (i > device->config_rom_length || q != device->config_rom[i])
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return REREAD_BIB_CHANGED;
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}
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return REREAD_BIB_UNCHANGED;
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}
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static void fw_device_refresh(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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struct fw_card *card = device->card;
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int node_id = device->node_id;
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switch (reread_bus_info_block(device, device->generation)) {
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case REREAD_BIB_ERROR:
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if (device->config_rom_retries < MAX_RETRIES / 2 &&
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atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
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device->config_rom_retries++;
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schedule_delayed_work(&device->work, RETRY_DELAY / 2);
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return;
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}
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goto give_up;
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case REREAD_BIB_GONE:
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goto gone;
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case REREAD_BIB_UNCHANGED:
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if (atomic_cmpxchg(&device->state,
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FW_DEVICE_INITIALIZING,
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FW_DEVICE_RUNNING) == FW_DEVICE_SHUTDOWN)
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goto gone;
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fw_device_update(work);
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device->config_rom_retries = 0;
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goto out;
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case REREAD_BIB_CHANGED:
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break;
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}
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/*
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* Something changed. We keep things simple and don't investigate
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* further. We just destroy all previous units and create new ones.
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*/
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device_for_each_child(&device->device, NULL, shutdown_unit);
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if (read_bus_info_block(device, device->generation) < 0) {
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if (device->config_rom_retries < MAX_RETRIES &&
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atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
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device->config_rom_retries++;
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schedule_delayed_work(&device->work, RETRY_DELAY);
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return;
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}
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goto give_up;
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}
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create_units(device);
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if (atomic_cmpxchg(&device->state,
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FW_DEVICE_INITIALIZING,
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FW_DEVICE_RUNNING) == FW_DEVICE_SHUTDOWN)
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goto gone;
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fw_notify("refreshed device %s\n", device->device.bus_id);
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device->config_rom_retries = 0;
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goto out;
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give_up:
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fw_notify("giving up on refresh of device %s\n", device->device.bus_id);
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gone:
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atomic_set(&device->state, FW_DEVICE_SHUTDOWN);
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fw_device_shutdown(work);
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out:
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if (node_id == card->root_node->node_id)
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schedule_delayed_work(&card->work, 0);
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}
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void fw_node_event(struct fw_card *card, struct fw_node *node, int event)
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{
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struct fw_device *device;
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@ -793,7 +930,7 @@ void fw_node_event(struct fw_card *card, struct fw_node *node, int event)
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case FW_NODE_LINK_ON:
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if (!node->link_on)
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break;
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create:
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device = kzalloc(sizeof(*device), GFP_ATOMIC);
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if (device == NULL)
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break;
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@ -832,6 +969,23 @@ void fw_node_event(struct fw_card *card, struct fw_node *node, int event)
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schedule_delayed_work(&device->work, INITIAL_DELAY);
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break;
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case FW_NODE_INITIATED_RESET:
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device = node->data;
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if (device == NULL)
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goto create;
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device->node_id = node->node_id;
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smp_wmb(); /* update node_id before generation */
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device->generation = card->generation;
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if (atomic_cmpxchg(&device->state,
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FW_DEVICE_RUNNING,
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FW_DEVICE_INITIALIZING) == FW_DEVICE_RUNNING) {
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PREPARE_DELAYED_WORK(&device->work, fw_device_refresh);
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schedule_delayed_work(&device->work,
|
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node == card->local_node ? 0 : INITIAL_DELAY);
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}
|
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break;
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|
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case FW_NODE_UPDATED:
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if (!node->link_on || node->data == NULL)
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break;
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|
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@ -21,6 +21,7 @@
|
|||
|
||||
#include <linux/fs.h>
|
||||
#include <linux/cdev.h>
|
||||
#include <linux/rwsem.h>
|
||||
#include <asm/atomic.h>
|
||||
|
||||
enum fw_device_state {
|
||||
|
|
@ -46,6 +47,11 @@ struct fw_attribute_group {
|
|||
* fw_device.node_id is guaranteed to be current too.
|
||||
*
|
||||
* The same applies to fw_device.card->node_id vs. fw_device.generation.
|
||||
*
|
||||
* fw_device.config_rom and fw_device.config_rom_length may be accessed during
|
||||
* the lifetime of any fw_unit belonging to the fw_device, before device_del()
|
||||
* was called on the last fw_unit. Alternatively, they may be accessed while
|
||||
* holding fw_device_rwsem.
|
||||
*/
|
||||
struct fw_device {
|
||||
atomic_t state;
|
||||
|
|
@ -53,6 +59,7 @@ struct fw_device {
|
|||
int node_id;
|
||||
int generation;
|
||||
unsigned max_speed;
|
||||
bool cmc;
|
||||
struct fw_card *card;
|
||||
struct device device;
|
||||
struct list_head link;
|
||||
|
|
@ -92,8 +99,12 @@ int fw_device_enable_phys_dma(struct fw_device *device);
|
|||
void fw_device_cdev_update(struct fw_device *device);
|
||||
void fw_device_cdev_remove(struct fw_device *device);
|
||||
|
||||
extern struct rw_semaphore fw_device_rwsem;
|
||||
extern int fw_cdev_major;
|
||||
|
||||
/*
|
||||
* fw_unit.directory must not be accessed after device_del(&fw_unit.device).
|
||||
*/
|
||||
struct fw_unit {
|
||||
struct device device;
|
||||
u32 *directory;
|
||||
|
|
|
|||
|
|
@ -153,6 +153,7 @@ struct sbp2_target {
|
|||
struct list_head lu_list;
|
||||
|
||||
u64 management_agent_address;
|
||||
u64 guid;
|
||||
int directory_id;
|
||||
int node_id;
|
||||
int address_high;
|
||||
|
|
@ -1114,6 +1115,7 @@ static int sbp2_probe(struct device *dev)
|
|||
kref_init(&tgt->kref);
|
||||
INIT_LIST_HEAD(&tgt->lu_list);
|
||||
tgt->bus_id = unit->device.bus_id;
|
||||
tgt->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4];
|
||||
|
||||
if (fw_device_enable_phys_dma(device) < 0)
|
||||
goto fail_shost_put;
|
||||
|
|
@ -1571,16 +1573,14 @@ sbp2_sysfs_ieee1394_id_show(struct device *dev, struct device_attribute *attr,
|
|||
{
|
||||
struct scsi_device *sdev = to_scsi_device(dev);
|
||||
struct sbp2_logical_unit *lu;
|
||||
struct fw_device *device;
|
||||
|
||||
if (!sdev)
|
||||
return 0;
|
||||
|
||||
lu = sdev->hostdata;
|
||||
device = fw_device(lu->tgt->unit->device.parent);
|
||||
|
||||
return sprintf(buf, "%08x%08x:%06x:%04x\n",
|
||||
device->config_rom[3], device->config_rom[4],
|
||||
return sprintf(buf, "%016llx:%06x:%04x\n",
|
||||
(unsigned long long)lu->tgt->guid,
|
||||
lu->tgt->directory_id, lu->lun);
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -108,6 +108,7 @@ static struct fw_node *fw_node_create(u32 sid, int port_count, int color)
|
|||
node->node_id = LOCAL_BUS | SELF_ID_PHY_ID(sid);
|
||||
node->link_on = SELF_ID_LINK_ON(sid);
|
||||
node->phy_speed = SELF_ID_PHY_SPEED(sid);
|
||||
node->initiated_reset = SELF_ID_PHY_INITIATOR(sid);
|
||||
node->port_count = port_count;
|
||||
|
||||
atomic_set(&node->ref_count, 1);
|
||||
|
|
@ -431,6 +432,8 @@ update_tree(struct fw_card *card, struct fw_node *root)
|
|||
event = FW_NODE_LINK_OFF;
|
||||
else if (!node0->link_on && node1->link_on)
|
||||
event = FW_NODE_LINK_ON;
|
||||
else if (node1->initiated_reset && node1->link_on)
|
||||
event = FW_NODE_INITIATED_RESET;
|
||||
else
|
||||
event = FW_NODE_UPDATED;
|
||||
|
||||
|
|
|
|||
|
|
@ -20,11 +20,12 @@
|
|||
#define __fw_topology_h
|
||||
|
||||
enum {
|
||||
FW_NODE_CREATED = 0x00,
|
||||
FW_NODE_UPDATED = 0x01,
|
||||
FW_NODE_DESTROYED = 0x02,
|
||||
FW_NODE_LINK_ON = 0x03,
|
||||
FW_NODE_LINK_OFF = 0x04,
|
||||
FW_NODE_CREATED,
|
||||
FW_NODE_UPDATED,
|
||||
FW_NODE_DESTROYED,
|
||||
FW_NODE_LINK_ON,
|
||||
FW_NODE_LINK_OFF,
|
||||
FW_NODE_INITIATED_RESET,
|
||||
};
|
||||
|
||||
struct fw_node {
|
||||
|
|
|
|||
Loading…
Reference in a new issue