diff options
Diffstat (limited to 'drivers/ieee1394/nodemgr.c')
| -rw-r--r-- | drivers/ieee1394/nodemgr.c | 1905 |
1 files changed, 1905 insertions, 0 deletions
diff --git a/drivers/ieee1394/nodemgr.c b/drivers/ieee1394/nodemgr.c new file mode 100644 index 0000000..79ef5fd --- /dev/null +++ b/drivers/ieee1394/nodemgr.c @@ -0,0 +1,1905 @@ +/* + * Node information (ConfigROM) collection and management. + * + * Copyright (C) 2000 Andreas E. Bombe + * 2001-2003 Ben Collins <bcollins@debian.net> + * + * This code is licensed under the GPL. See the file COPYING in the root + * directory of the kernel sources for details. + */ + +#include <linux/bitmap.h> +#include <linux/kernel.h> +#include <linux/list.h> +#include <linux/slab.h> +#include <linux/delay.h> +#include <linux/kthread.h> +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/mutex.h> +#include <linux/freezer.h> +#include <linux/semaphore.h> +#include <asm/atomic.h> + +#include "csr.h" +#include "highlevel.h" +#include "hosts.h" +#include "ieee1394.h" +#include "ieee1394_core.h" +#include "ieee1394_hotplug.h" +#include "ieee1394_types.h" +#include "ieee1394_transactions.h" +#include "nodemgr.h" + +static int ignore_drivers; +module_param(ignore_drivers, int, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(ignore_drivers, "Disable automatic probing for drivers."); + +struct nodemgr_csr_info { + struct hpsb_host *host; + nodeid_t nodeid; + unsigned int generation; + unsigned int speed_unverified:1; +}; + + +/* + * Correct the speed map entry. This is necessary + * - for nodes with link speed < phy speed, + * - for 1394b nodes with negotiated phy port speed < IEEE1394_SPEED_MAX. + * A possible speed is determined by trial and error, using quadlet reads. + */ +static int nodemgr_check_speed(struct nodemgr_csr_info *ci, u64 addr, + quadlet_t *buffer) +{ + quadlet_t q; + u8 i, *speed, old_speed, good_speed; + int error; + + speed = &(ci->host->speed[NODEID_TO_NODE(ci->nodeid)]); + old_speed = *speed; + good_speed = IEEE1394_SPEED_MAX + 1; + + /* Try every speed from S100 to old_speed. + * If we did it the other way around, a too low speed could be caught + * if the retry succeeded for some other reason, e.g. because the link + * just finished its initialization. */ + for (i = IEEE1394_SPEED_100; i <= old_speed; i++) { + *speed = i; + error = hpsb_read(ci->host, ci->nodeid, ci->generation, addr, + &q, sizeof(quadlet_t)); + if (error) + break; + *buffer = q; + good_speed = i; + } + if (good_speed <= IEEE1394_SPEED_MAX) { + HPSB_DEBUG("Speed probe of node " NODE_BUS_FMT " yields %s", + NODE_BUS_ARGS(ci->host, ci->nodeid), + hpsb_speedto_str[good_speed]); + *speed = good_speed; + ci->speed_unverified = 0; + return 0; + } + *speed = old_speed; + return error; +} + +static int nodemgr_bus_read(struct csr1212_csr *csr, u64 addr, u16 length, + void *buffer, void *__ci) +{ + struct nodemgr_csr_info *ci = (struct nodemgr_csr_info*)__ci; + int i, error; + + for (i = 1; ; i++) { + error = hpsb_read(ci->host, ci->nodeid, ci->generation, addr, + buffer, length); + if (!error) { + ci->speed_unverified = 0; + break; + } + /* Give up after 3rd failure. */ + if (i == 3) + break; + + /* The ieee1394_core guessed the node's speed capability from + * the self ID. Check whether a lower speed works. */ + if (ci->speed_unverified && length == sizeof(quadlet_t)) { + error = nodemgr_check_speed(ci, addr, buffer); + if (!error) + break; + } + if (msleep_interruptible(334)) + return -EINTR; + } + return error; +} + +#define OUI_FREECOM_TECHNOLOGIES_GMBH 0x0001db + +static int nodemgr_get_max_rom(quadlet_t *bus_info_data, void *__ci) +{ + /* Freecom FireWire Hard Drive firmware bug */ + if (be32_to_cpu(bus_info_data[3]) >> 8 == OUI_FREECOM_TECHNOLOGIES_GMBH) + return 0; + + return (be32_to_cpu(bus_info_data[2]) >> 8) & 0x3; +} + +static struct csr1212_bus_ops nodemgr_csr_ops = { + .bus_read = nodemgr_bus_read, + .get_max_rom = nodemgr_get_max_rom +}; + + +/* + * Basically what we do here is start off retrieving the bus_info block. + * From there will fill in some info about the node, verify it is of IEEE + * 1394 type, and that the crc checks out ok. After that we start off with + * the root directory, and subdirectories. To do this, we retrieve the + * quadlet header for a directory, find out the length, and retrieve the + * complete directory entry (be it a leaf or a directory). We then process + * it and add the info to our structure for that particular node. + * + * We verify CRC's along the way for each directory/block/leaf. The entire + * node structure is generic, and simply stores the information in a way + * that's easy to parse by the protocol interface. + */ + +/* + * The nodemgr relies heavily on the Driver Model for device callbacks and + * driver/device mappings. The old nodemgr used to handle all this itself, + * but now we are much simpler because of the LDM. + */ + +struct host_info { + struct hpsb_host *host; + struct list_head list; + struct task_struct *thread; +}; + +static int nodemgr_bus_match(struct device * dev, struct device_driver * drv); +static int nodemgr_uevent(struct device *dev, struct kobj_uevent_env *env); + +struct bus_type ieee1394_bus_type = { + .name = "ieee1394", + .match = nodemgr_bus_match, +}; + +static void host_cls_release(struct device *dev) +{ + put_device(&container_of((dev), struct hpsb_host, host_dev)->device); +} + +struct class hpsb_host_class = { + .name = "ieee1394_host", + .dev_release = host_cls_release, +}; + +static void ne_cls_release(struct device *dev) +{ + put_device(&container_of((dev), struct node_entry, node_dev)->device); +} + +static struct class nodemgr_ne_class = { + .name = "ieee1394_node", + .dev_release = ne_cls_release, +}; + +static void ud_cls_release(struct device *dev) +{ + put_device(&container_of((dev), struct unit_directory, unit_dev)->device); +} + +/* The name here is only so that unit directory hotplug works with old + * style hotplug, which only ever did unit directories anyway. + */ +static struct class nodemgr_ud_class = { + .name = "ieee1394", + .dev_release = ud_cls_release, + .dev_uevent = nodemgr_uevent, +}; + +static struct hpsb_highlevel nodemgr_highlevel; + + +static void nodemgr_release_ud(struct device *dev) +{ + struct unit_directory *ud = container_of(dev, struct unit_directory, device); + + if (ud->vendor_name_kv) + csr1212_release_keyval(ud->vendor_name_kv); + if (ud->model_name_kv) + csr1212_release_keyval(ud->model_name_kv); + + kfree(ud); +} + +static void nodemgr_release_ne(struct device *dev) +{ + struct node_entry *ne = container_of(dev, struct node_entry, device); + + if (ne->vendor_name_kv) + csr1212_release_keyval(ne->vendor_name_kv); + + kfree(ne); +} + + +static void nodemgr_release_host(struct device *dev) +{ + struct hpsb_host *host = container_of(dev, struct hpsb_host, device); + + csr1212_destroy_csr(host->csr.rom); + + kfree(host); +} + +static int nodemgr_ud_platform_data; + +static struct device nodemgr_dev_template_ud = { + .bus = &ieee1394_bus_type, + .release = nodemgr_release_ud, + .platform_data = &nodemgr_ud_platform_data, +}; + +static struct device nodemgr_dev_template_ne = { + .bus = &ieee1394_bus_type, + .release = nodemgr_release_ne, +}; + +/* This dummy driver prevents the host devices from being scanned. We have no + * useful drivers for them yet, and there would be a deadlock possible if the + * driver core scans the host device while the host's low-level driver (i.e. + * the host's parent device) is being removed. */ +static struct device_driver nodemgr_mid_layer_driver = { + .bus = &ieee1394_bus_type, + .name = "nodemgr", + .owner = THIS_MODULE, +}; + +struct device nodemgr_dev_template_host = { + .bus = &ieee1394_bus_type, + .release = nodemgr_release_host, +}; + + +#define fw_attr(class, class_type, field, type, format_string) \ +static ssize_t fw_show_##class##_##field (struct device *dev, struct device_attribute *attr, char *buf)\ +{ \ + class_type *class; \ + class = container_of(dev, class_type, device); \ + return sprintf(buf, format_string, (type)class->field); \ +} \ +static struct device_attribute dev_attr_##class##_##field = { \ + .attr = {.name = __stringify(field), .mode = S_IRUGO }, \ + .show = fw_show_##class##_##field, \ +}; + +#define fw_attr_td(class, class_type, td_kv) \ +static ssize_t fw_show_##class##_##td_kv (struct device *dev, struct device_attribute *attr, char *buf)\ +{ \ + int len; \ + class_type *class = container_of(dev, class_type, device); \ + len = (class->td_kv->value.leaf.len - 2) * sizeof(quadlet_t); \ + memcpy(buf, \ + CSR1212_TEXTUAL_DESCRIPTOR_LEAF_DATA(class->td_kv), \ + len); \ + while (buf[len - 1] == '\0') \ + len--; \ + buf[len++] = '\n'; \ + buf[len] = '\0'; \ + return len; \ +} \ +static struct device_attribute dev_attr_##class##_##td_kv = { \ + .attr = {.name = __stringify(td_kv), .mode = S_IRUGO }, \ + .show = fw_show_##class##_##td_kv, \ +}; + + +#define fw_drv_attr(field, type, format_string) \ +static ssize_t fw_drv_show_##field (struct device_driver *drv, char *buf) \ +{ \ + struct hpsb_protocol_driver *driver; \ + driver = container_of(drv, struct hpsb_protocol_driver, driver); \ + return sprintf(buf, format_string, (type)driver->field);\ +} \ +static struct driver_attribute driver_attr_drv_##field = { \ + .attr = {.name = __stringify(field), .mode = S_IRUGO }, \ + .show = fw_drv_show_##field, \ +}; + + +static ssize_t fw_show_ne_bus_options(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct node_entry *ne = container_of(dev, struct node_entry, device); + + return sprintf(buf, "IRMC(%d) CMC(%d) ISC(%d) BMC(%d) PMC(%d) GEN(%d) " + "LSPD(%d) MAX_REC(%d) MAX_ROM(%d) CYC_CLK_ACC(%d)\n", + ne->busopt.irmc, + ne->busopt.cmc, ne->busopt.isc, ne->busopt.bmc, + ne->busopt.pmc, ne->busopt.generation, ne->busopt.lnkspd, + ne->busopt.max_rec, + ne->busopt.max_rom, + ne->busopt.cyc_clk_acc); +} +static DEVICE_ATTR(bus_options,S_IRUGO,fw_show_ne_bus_options,NULL); + + +#ifdef HPSB_DEBUG_TLABELS +static ssize_t fw_show_ne_tlabels_free(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct node_entry *ne = container_of(dev, struct node_entry, device); + unsigned long flags; + unsigned long *tp = ne->host->tl_pool[NODEID_TO_NODE(ne->nodeid)].map; + int tf; + + spin_lock_irqsave(&hpsb_tlabel_lock, flags); + tf = 64 - bitmap_weight(tp, 64); + spin_unlock_irqrestore(&hpsb_tlabel_lock, flags); + + return sprintf(buf, "%d\n", tf); +} +static DEVICE_ATTR(tlabels_free,S_IRUGO,fw_show_ne_tlabels_free,NULL); + + +static ssize_t fw_show_ne_tlabels_mask(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct node_entry *ne = container_of(dev, struct node_entry, device); + unsigned long flags; + unsigned long *tp = ne->host->tl_pool[NODEID_TO_NODE(ne->nodeid)].map; + u64 tm; + + spin_lock_irqsave(&hpsb_tlabel_lock, flags); +#if (BITS_PER_LONG <= 32) + tm = ((u64)tp[0] << 32) + tp[1]; +#else + tm = tp[0]; +#endif + spin_unlock_irqrestore(&hpsb_tlabel_lock, flags); + + return sprintf(buf, "0x%016llx\n", (unsigned long long)tm); +} +static DEVICE_ATTR(tlabels_mask, S_IRUGO, fw_show_ne_tlabels_mask, NULL); +#endif /* HPSB_DEBUG_TLABELS */ + + +static ssize_t fw_set_ignore_driver(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) +{ + struct unit_directory *ud = container_of(dev, struct unit_directory, device); + int state = simple_strtoul(buf, NULL, 10); + + if (state == 1) { + ud->ignore_driver = 1; + device_release_driver(dev); + } else if (state == 0) + ud->ignore_driver = 0; + + return count; +} +static ssize_t fw_get_ignore_driver(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct unit_directory *ud = container_of(dev, struct unit_directory, device); + + return sprintf(buf, "%d\n", ud->ignore_driver); +} +static DEVICE_ATTR(ignore_driver, S_IWUSR | S_IRUGO, fw_get_ignore_driver, fw_set_ignore_driver); + + +static ssize_t fw_set_rescan(struct bus_type *bus, const char *buf, + size_t count) +{ + int error = 0; + + if (simple_strtoul(buf, NULL, 10) == 1) + error = bus_rescan_devices(&ieee1394_bus_type); + return error ? error : count; +} +static ssize_t fw_get_rescan(struct bus_type *bus, char *buf) +{ + return sprintf(buf, "You can force a rescan of the bus for " + "drivers by writing a 1 to this file\n"); +} +static BUS_ATTR(rescan, S_IWUSR | S_IRUGO, fw_get_rescan, fw_set_rescan); + + +static ssize_t fw_set_ignore_drivers(struct bus_type *bus, const char *buf, size_t count) +{ + int state = simple_strtoul(buf, NULL, 10); + + if (state == 1) + ignore_drivers = 1; + else if (state == 0) + ignore_drivers = 0; + + return count; +} +static ssize_t fw_get_ignore_drivers(struct bus_type *bus, char *buf) +{ + return sprintf(buf, "%d\n", ignore_drivers); +} +static BUS_ATTR(ignore_drivers, S_IWUSR | S_IRUGO, fw_get_ignore_drivers, fw_set_ignore_drivers); + + +struct bus_attribute *const fw_bus_attrs[] = { + &bus_attr_rescan, + &bus_attr_ignore_drivers, + NULL +}; + + +fw_attr(ne, struct node_entry, capabilities, unsigned int, "0x%06x\n") +fw_attr(ne, struct node_entry, nodeid, unsigned int, "0x%04x\n") + +fw_attr(ne, struct node_entry, vendor_id, unsigned int, "0x%06x\n") +fw_attr_td(ne, struct node_entry, vendor_name_kv) + +fw_attr(ne, struct node_entry, guid, unsigned long long, "0x%016Lx\n") +fw_attr(ne, struct node_entry, guid_vendor_id, unsigned int, "0x%06x\n") +fw_attr(ne, struct node_entry, in_limbo, int, "%d\n"); + +static struct device_attribute *const fw_ne_attrs[] = { + &dev_attr_ne_guid, + &dev_attr_ne_guid_vendor_id, + &dev_attr_ne_capabilities, + &dev_attr_ne_vendor_id, + &dev_attr_ne_nodeid, + &dev_attr_bus_options, +#ifdef HPSB_DEBUG_TLABELS + &dev_attr_tlabels_free, + &dev_attr_tlabels_mask, +#endif +}; + + + +fw_attr(ud, struct unit_directory, address, unsigned long long, "0x%016Lx\n") +fw_attr(ud, struct unit_directory, length, int, "%d\n") +/* These are all dependent on the value being provided */ +fw_attr(ud, struct unit_directory, vendor_id, unsigned int, "0x%06x\n") +fw_attr(ud, struct unit_directory, model_id, unsigned int, "0x%06x\n") +fw_attr(ud, struct unit_directory, specifier_id, unsigned int, "0x%06x\n") +fw_attr(ud, struct unit_directory, version, unsigned int, "0x%06x\n") +fw_attr_td(ud, struct unit_directory, vendor_name_kv) +fw_attr_td(ud, struct unit_directory, model_name_kv) + +static struct device_attribute *const fw_ud_attrs[] = { + &dev_attr_ud_address, + &dev_attr_ud_length, + &dev_attr_ignore_driver, +}; + + +fw_attr(host, struct hpsb_host, node_count, int, "%d\n") +fw_attr(host, struct hpsb_host, selfid_count, int, "%d\n") +fw_attr(host, struct hpsb_host, nodes_active, int, "%d\n") +fw_attr(host, struct hpsb_host, in_bus_reset, int, "%d\n") +fw_attr(host, struct hpsb_host, is_root, int, "%d\n") +fw_attr(host, struct hpsb_host, is_cycmst, int, "%d\n") +fw_attr(host, struct hpsb_host, is_irm, int, "%d\n") +fw_attr(host, struct hpsb_host, is_busmgr, int, "%d\n") + +static struct device_attribute *const fw_host_attrs[] = { + &dev_attr_host_node_count, + &dev_attr_host_selfid_count, + &dev_attr_host_nodes_active, + &dev_attr_host_in_bus_reset, + &dev_attr_host_is_root, + &dev_attr_host_is_cycmst, + &dev_attr_host_is_irm, + &dev_attr_host_is_busmgr, +}; + + +static ssize_t fw_show_drv_device_ids(struct device_driver *drv, char *buf) +{ + struct hpsb_protocol_driver *driver; + struct ieee1394_device_id *id; + int length = 0; + char *scratch = buf; + + driver = container_of(drv, struct hpsb_protocol_driver, driver); + id = driver->id_table; + if (!id) + return 0; + + for (; id->match_flags != 0; id++) { + int need_coma = 0; + + if (id->match_flags & IEEE1394_MATCH_VENDOR_ID) { + length += sprintf(scratch, "vendor_id=0x%06x", id->vendor_id); + scratch = buf + length; + need_coma++; + } + + if (id->match_flags & IEEE1394_MATCH_MODEL_ID) { + length += sprintf(scratch, "%smodel_id=0x%06x", + need_coma++ ? "," : "", + id->model_id); + scratch = buf + length; + } + + if (id->match_flags & IEEE1394_MATCH_SPECIFIER_ID) { + length += sprintf(scratch, "%sspecifier_id=0x%06x", + need_coma++ ? "," : "", + id->specifier_id); + scratch = buf + length; + } + + if (id->match_flags & IEEE1394_MATCH_VERSION) { + length += sprintf(scratch, "%sversion=0x%06x", + need_coma++ ? "," : "", + id->version); + scratch = buf + length; + } + + if (need_coma) { + *scratch++ = '\n'; + length++; + } + } + + return length; +} +static DRIVER_ATTR(device_ids,S_IRUGO,fw_show_drv_device_ids,NULL); + + +fw_drv_attr(name, const char *, "%s\n") + +static struct driver_attribute *const fw_drv_attrs[] = { + &driver_attr_drv_name, + &driver_attr_device_ids, +}; + + +static void nodemgr_create_drv_files(struct hpsb_protocol_driver *driver) +{ + struct device_driver *drv = &driver->driver; + int i; + + for (i = 0; i < ARRAY_SIZE(fw_drv_attrs); i++) + if (driver_create_file(drv, fw_drv_attrs[i])) + goto fail; + return; +fail: + HPSB_ERR("Failed to add sysfs attribute"); +} + + +static void nodemgr_remove_drv_files(struct hpsb_protocol_driver *driver) +{ + struct device_driver *drv = &driver->driver; + int i; + + for (i = 0; i < ARRAY_SIZE(fw_drv_attrs); i++) + driver_remove_file(drv, fw_drv_attrs[i]); +} + + +static void nodemgr_create_ne_dev_files(struct node_entry *ne) +{ + struct device *dev = &ne->device; + int i; + + for (i = 0; i < ARRAY_SIZE(fw_ne_attrs); i++) + if (device_create_file(dev, fw_ne_attrs[i])) + goto fail; + return; +fail: + HPSB_ERR("Failed to add sysfs attribute"); +} + + +static void nodemgr_create_host_dev_files(struct hpsb_host *host) +{ + struct device *dev = &host->device; + int i; + + for (i = 0; i < ARRAY_SIZE(fw_host_attrs); i++) + if (device_create_file(dev, fw_host_attrs[i])) + goto fail; + return; +fail: + HPSB_ERR("Failed to add sysfs attribute"); +} + + +static struct node_entry *find_entry_by_nodeid(struct hpsb_host *host, + nodeid_t nodeid); + +static void nodemgr_update_host_dev_links(struct hpsb_host *host) +{ + struct device *dev = &host->device; + struct node_entry *ne; + + sysfs_remove_link(&dev->kobj, "irm_id"); + sysfs_remove_link(&dev->kobj, "busmgr_id"); + sysfs_remove_link(&dev->kobj, "host_id"); + + if ((ne = find_entry_by_nodeid(host, host->irm_id)) && + sysfs_create_link(&dev->kobj, &ne->device.kobj, "irm_id")) + goto fail; + if ((ne = find_entry_by_nodeid(host, host->busmgr_id)) && + sysfs_create_link(&dev->kobj, &ne->device.kobj, "busmgr_id")) + goto fail; + if ((ne = find_entry_by_nodeid(host, host->node_id)) && + sysfs_create_link(&dev->kobj, &ne->device.kobj, "host_id")) + goto fail; + return; +fail: + HPSB_ERR("Failed to update sysfs attributes for host %d", host->id); +} + +static void nodemgr_create_ud_dev_files(struct unit_directory *ud) +{ + struct device *dev = &ud->device; + int i; + + for (i = 0; i < ARRAY_SIZE(fw_ud_attrs); i++) + if (device_create_file(dev, fw_ud_attrs[i])) + goto fail; + if (ud->flags & UNIT_DIRECTORY_SPECIFIER_ID) + if (device_create_file(dev, &dev_attr_ud_specifier_id)) + goto fail; + if (ud->flags & UNIT_DIRECTORY_VERSION) + if (device_create_file(dev, &dev_attr_ud_version)) + goto fail; + if (ud->flags & UNIT_DIRECTORY_VENDOR_ID) { + if (device_create_file(dev, &dev_attr_ud_vendor_id)) + goto fail; + if (ud->vendor_name_kv && + device_create_file(dev, &dev_attr_ud_vendor_name_kv)) + goto fail; + } + if (ud->flags & UNIT_DIRECTORY_MODEL_ID) { + if (device_create_file(dev, &dev_attr_ud_model_id)) + goto fail; + if (ud->model_name_kv && + device_create_file(dev, &dev_attr_ud_model_name_kv)) + goto fail; + } + return; +fail: + HPSB_ERR("Failed to add sysfs attribute"); +} + + +static int nodemgr_bus_match(struct device * dev, struct device_driver * drv) +{ + struct hpsb_protocol_driver *driver; + struct unit_directory *ud; + struct ieee1394_device_id *id; + + /* We only match unit directories */ + if (dev->platform_data != &nodemgr_ud_platform_data) + return 0; + + ud = container_of(dev, struct unit_directory, device); + if (ud->ne->in_limbo || ud->ignore_driver) + return 0; + + /* We only match drivers of type hpsb_protocol_driver */ + if (drv == &nodemgr_mid_layer_driver) + return 0; + + driver = container_of(drv, struct hpsb_protocol_driver, driver); + id = driver->id_table; + if (!id) + return 0; + + for (; id->match_flags != 0; id++) { + if ((id->match_flags & IEEE1394_MATCH_VENDOR_ID) && + id->vendor_id != ud->vendor_id) + continue; + + if ((id->match_flags & IEEE1394_MATCH_MODEL_ID) && + id->model_id != ud->model_id) + continue; + + if ((id->match_flags & IEEE1394_MATCH_SPECIFIER_ID) && + id->specifier_id != ud->specifier_id) + continue; + + if ((id->match_flags & IEEE1394_MATCH_VERSION) && + id->version != ud->version) + continue; + + return 1; + } + + return 0; +} + + +static DEFINE_MUTEX(nodemgr_serialize_remove_uds); + +static int match_ne(struct device *dev, void *data) +{ + struct unit_directory *ud; + struct node_entry *ne = data; + + ud = container_of(dev, struct unit_directory, unit_dev); + return ud->ne == ne; +} + +static void nodemgr_remove_uds(struct node_entry *ne) +{ + struct device *dev; + struct unit_directory *ud; + + /* Use class_find device to iterate the devices. Since this code + * may be called from other contexts besides the knodemgrds, + * protect it by nodemgr_serialize_remove_uds. + */ + mutex_lock(&nodemgr_serialize_remove_uds); + for (;;) { + dev = class_find_device(&nodemgr_ud_class, NULL, ne, match_ne); + if (!dev) + break; + ud = container_of(dev, struct unit_directory, unit_dev); + put_device(dev); + device_unregister(&ud->unit_dev); + device_unregister(&ud->device); + } + mutex_unlock(&nodemgr_serialize_remove_uds); +} + + +static void nodemgr_remove_ne(struct node_entry *ne) +{ + struct device *dev; + + dev = get_device(&ne->device); + if (!dev) + return; + + HPSB_DEBUG("Node removed: ID:BUS[" NODE_BUS_FMT "] GUID[%016Lx]", + NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid); + nodemgr_remove_uds(ne); + + device_unregister(&ne->node_dev); + device_unregister(dev); + + put_device(dev); +} + +static int remove_host_dev(struct device *dev, void *data) +{ + if (dev->bus == &ieee1394_bus_type) + nodemgr_remove_ne(container_of(dev, struct node_entry, + device)); + return 0; +} + +static void nodemgr_remove_host_dev(struct device *dev) +{ + device_for_each_child(dev, NULL, remove_host_dev); + sysfs_remove_link(&dev->kobj, "irm_id"); + sysfs_remove_link(&dev->kobj, "busmgr_id"); + sysfs_remove_link(&dev->kobj, "host_id"); +} + + +static void nodemgr_update_bus_options(struct node_entry *ne) +{ +#ifdef CONFIG_IEEE1394_VERBOSEDEBUG + static const u16 mr[] = { 4, 64, 1024, 0}; +#endif + quadlet_t busoptions = be32_to_cpu(ne->csr->bus_info_data[2]); + + ne->busopt.irmc = (busoptions >> 31) & 1; + ne->busopt.cmc = (busoptions >> 30) & 1; + ne->busopt.isc = (busoptions >> 29) & 1; + ne->busopt.bmc = (busoptions >> 28) & 1; + ne->busopt.pmc = (busoptions >> 27) & 1; + ne->busopt.cyc_clk_acc = (busoptions >> 16) & 0xff; + ne->busopt.max_rec = 1 << (((busoptions >> 12) & 0xf) + 1); + ne->busopt.max_rom = (busoptions >> 8) & 0x3; + ne->busopt.generation = (busoptions >> 4) & 0xf; + ne->busopt.lnkspd = busoptions & 0x7; + + HPSB_VERBOSE("NodeMgr: raw=0x%08x irmc=%d cmc=%d isc=%d bmc=%d pmc=%d " + "cyc_clk_acc=%d max_rec=%d max_rom=%d gen=%d lspd=%d", + busoptions, ne->busopt.irmc, ne->busopt.cmc, + ne->busopt.isc, ne->busopt.bmc, ne->busopt.pmc, + ne->busopt.cyc_clk_acc, ne->busopt.max_rec, + mr[ne->busopt.max_rom], + ne->busopt.generation, ne->busopt.lnkspd); +} + + +static struct node_entry *nodemgr_create_node(octlet_t guid, + struct csr1212_csr *csr, struct hpsb_host *host, + nodeid_t nodeid, unsigned int generation) +{ + struct node_entry *ne; + + ne = kzalloc(sizeof(*ne), GFP_KERNEL); + if (!ne) + goto fail_alloc; + + ne->host = host; + ne->nodeid = nodeid; + ne->generation = generation; + ne->needs_probe = true; + + ne->guid = guid; + ne->guid_vendor_id = (guid >> 40) & 0xffffff; + ne->csr = csr; + + memcpy(&ne->device, &nodemgr_dev_template_ne, + sizeof(ne->device)); + ne->device.parent = &host->device; + dev_set_name(&ne->device, "%016Lx", (unsigned long long)(ne->guid)); + + ne->node_dev.parent = &ne->device; + ne->node_dev.class = &nodemgr_ne_class; + dev_set_name(&ne->node_dev, "%016Lx", (unsigned long long)(ne->guid)); + + if (device_register(&ne->device)) + goto fail_devreg; + if (device_register(&ne->node_dev)) + goto fail_classdevreg; + get_device(&ne->device); + + nodemgr_create_ne_dev_files(ne); + + nodemgr_update_bus_options(ne); + + HPSB_DEBUG("%s added: ID:BUS[" NODE_BUS_FMT "] GUID[%016Lx]", + (host->node_id == nodeid) ? "Host" : "Node", + NODE_BUS_ARGS(host, nodeid), (unsigned long long)guid); + + return ne; + +fail_classdevreg: + device_unregister(&ne->device); +fail_devreg: + kfree(ne); +fail_alloc: + HPSB_ERR("Failed to create node ID:BUS[" NODE_BUS_FMT "] GUID[%016Lx]", + NODE_BUS_ARGS(host, nodeid), (unsigned long long)guid); + + return NULL; +} + +static int match_ne_guid(struct device *dev, void *data) +{ + struct node_entry *ne; + u64 *guid = data; + + ne = container_of(dev, struct node_entry, node_dev); + return ne->guid == *guid; +} + +static struct node_entry *find_entry_by_guid(u64 guid) +{ + struct device *dev; + struct node_entry *ne; + + dev = class_find_device(&nodemgr_ne_class, NULL, &guid, match_ne_guid); + if (!dev) + return NULL; + ne = container_of(dev, struct node_entry, node_dev); + put_device(dev); + + return ne; +} + +struct match_nodeid_parameter { + struct hpsb_host *host; + nodeid_t nodeid; +}; + +static int match_ne_nodeid(struct device *dev, void *data) +{ + int found = 0; + struct node_entry *ne; + struct match_nodeid_parameter *p = data; + + if (!dev) + goto ret; + ne = container_of(dev, struct node_entry, node_dev); + if (ne->host == p->host && ne->nodeid == p->nodeid) + found = 1; +ret: + return found; +} + +static struct node_entry *find_entry_by_nodeid(struct hpsb_host *host, + nodeid_t nodeid) +{ + struct device *dev; + struct node_entry *ne; + struct match_nodeid_parameter p; + + p.host = host; + p.nodeid = nodeid; + + dev = class_find_device(&nodemgr_ne_class, NULL, &p, match_ne_nodeid); + if (!dev) + return NULL; + ne = container_of(dev, struct node_entry, node_dev); + put_device(dev); + + return ne; +} + + +static void nodemgr_register_device(struct node_entry *ne, + struct unit_directory *ud, struct device *parent) +{ + memcpy(&ud->device, &nodemgr_dev_template_ud, + sizeof(ud->device)); + + ud->device.parent = parent; + + dev_set_name(&ud->device, "%s-%u", dev_name(&ne->device), ud->id); + + ud->unit_dev.parent = &ud->device; + ud->unit_dev.class = &nodemgr_ud_class; + dev_set_name(&ud->unit_dev, "%s-%u", dev_name(&ne->device), ud->id); + + if (device_register(&ud->device)) + goto fail_devreg; + if (device_register(&ud->unit_dev)) + goto fail_classdevreg; + get_device(&ud->device); + + nodemgr_create_ud_dev_files(ud); + + return; + +fail_classdevreg: + device_unregister(&ud->device); +fail_devreg: + HPSB_ERR("Failed to create unit %s", dev_name(&ud->device)); +} + + +/* This implementation currently only scans the config rom and its + * immediate unit directories looking for software_id and + * software_version entries, in order to get driver autoloading working. */ +static struct unit_directory *nodemgr_process_unit_directory + (struct node_entry *ne, struct csr1212_keyval *ud_kv, + unsigned int *id, struct unit_directory *parent) +{ + struct unit_directory *ud; + struct unit_directory *ud_child = NULL; + struct csr1212_dentry *dentry; + struct csr1212_keyval *kv; + u8 last_key_id = 0; + + ud = kzalloc(sizeof(*ud), GFP_KERNEL); + if (!ud) + goto unit_directory_error; + + ud->ne = ne; + ud->ignore_driver = ignore_drivers; + ud->address = ud_kv->offset + CSR1212_REGISTER_SPACE_BASE; + ud->directory_id = ud->address & 0xffffff; + ud->ud_kv = ud_kv; + ud->id = (*id)++; + + csr1212_for_each_dir_entry(ne->csr, kv, ud_kv, dentry) { + switch (kv->key.id) { + case CSR1212_KV_ID_VENDOR: + if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) { + ud->vendor_id = kv->value.immediate; + ud->flags |= UNIT_DIRECTORY_VENDOR_ID; + } + break; + + case CSR1212_KV_ID_MODEL: + ud->model_id = kv->value.immediate; + ud->flags |= UNIT_DIRECTORY_MODEL_ID; + break; + + case CSR1212_KV_ID_SPECIFIER_ID: + ud->specifier_id = kv->value.immediate; + ud->flags |= UNIT_DIRECTORY_SPECIFIER_ID; + break; + + case CSR1212_KV_ID_VERSION: + ud->version = kv->value.immediate; + ud->flags |= UNIT_DIRECTORY_VERSION; + break; + + case CSR1212_KV_ID_DESCRIPTOR: + if (kv->key.type == CSR1212_KV_TYPE_LEAF && + CSR1212_DESCRIPTOR_LEAF_TYPE(kv) == 0 && + CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) == 0 && + CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH(kv) == 0 && + CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET(kv) == 0 && + CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE(kv) == 0) { + switch (last_key_id) { + case CSR1212_KV_ID_VENDOR: + csr1212_keep_keyval(kv); + ud->vendor_name_kv = kv; + break; + + case CSR1212_KV_ID_MODEL: + csr1212_keep_keyval(kv); + ud->model_name_kv = kv; + break; + + } + } /* else if (kv->key.type == CSR1212_KV_TYPE_DIRECTORY) ... */ + break; + + case CSR1212_KV_ID_DEPENDENT_INFO: + /* Logical Unit Number */ + if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) { + if (ud->flags & UNIT_DIRECTORY_HAS_LUN) { + ud_child = kmemdup(ud, sizeof(*ud_child), GFP_KERNEL); + if (!ud_child) + goto unit_directory_error; + nodemgr_register_device(ne, ud_child, &ne->device); + ud_child = NULL; + + ud->id = (*id)++; + } + ud->lun = kv->value.immediate; + ud->flags |= UNIT_DIRECTORY_HAS_LUN; + + /* Logical Unit Directory */ + } else if (kv->key.type == CSR1212_KV_TYPE_DIRECTORY) { + /* This should really be done in SBP2 as this is + * doing SBP2 specific parsing. + */ + + /* first register the parent unit */ + ud->flags |= UNIT_DIRECTORY_HAS_LUN_DIRECTORY; + if (ud->device.bus != &ieee1394_bus_type) + nodemgr_register_device(ne, ud, &ne->device); + + /* process the child unit */ + ud_child = nodemgr_process_unit_directory(ne, kv, id, ud); + + if (ud_child == NULL) + break; + + /* inherit unspecified values, the driver core picks it up */ + if ((ud->flags & UNIT_DIRECTORY_MODEL_ID) && + !(ud_child->flags & UNIT_DIRECTORY_MODEL_ID)) + { + ud_child->flags |= UNIT_DIRECTORY_MODEL_ID; + ud_child->model_id = ud->model_id; + } + if ((ud->flags & UNIT_DIRECTORY_SPECIFIER_ID) && + !(ud_child->flags & UNIT_DIRECTORY_SPECIFIER_ID)) + { + ud_child->flags |= UNIT_DIRECTORY_SPECIFIER_ID; + ud_child->specifier_id = ud->specifier_id; + } + if ((ud->flags & UNIT_DIRECTORY_VERSION) && + !(ud_child->flags & UNIT_DIRECTORY_VERSION)) + { + ud_child->flags |= UNIT_DIRECTORY_VERSION; + ud_child->version = ud->version; + } + + /* register the child unit */ + ud_child->flags |= UNIT_DIRECTORY_LUN_DIRECTORY; + nodemgr_register_device(ne, ud_child, &ud->device); + } + + break; + + case CSR1212_KV_ID_DIRECTORY_ID: + ud->directory_id = kv->value.immediate; + break; + + default: + break; + } + last_key_id = kv->key.id; + } + + /* do not process child units here and only if not already registered */ + if (!parent && ud->device.bus != &ieee1394_bus_type) + nodemgr_register_device(ne, ud, &ne->device); + + return ud; + +unit_directory_error: + kfree(ud); + return NULL; +} + + +static void nodemgr_process_root_directory(struct node_entry *ne) +{ + unsigned int ud_id = 0; + struct csr1212_dentry *dentry; + struct csr1212_keyval *kv, *vendor_name_kv = NULL; + u8 last_key_id = 0; + + ne->needs_probe = false; + + csr1212_for_each_dir_entry(ne->csr, kv, ne->csr->root_kv, dentry) { + switch (kv->key.id) { + case CSR1212_KV_ID_VENDOR: + ne->vendor_id = kv->value.immediate; + break; + + case CSR1212_KV_ID_NODE_CAPABILITIES: + ne->capabilities = kv->value.immediate; + break; + + case CSR1212_KV_ID_UNIT: + nodemgr_process_unit_directory(ne, kv, &ud_id, NULL); + break; + + case CSR1212_KV_ID_DESCRIPTOR: + if (last_key_id == CSR1212_KV_ID_VENDOR) { + if (kv->key.type == CSR1212_KV_TYPE_LEAF && + CSR1212_DESCRIPTOR_LEAF_TYPE(kv) == 0 && + CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) == 0 && + CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH(kv) == 0 && + CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET(kv) == 0 && + CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE(kv) == 0) { + csr1212_keep_keyval(kv); + vendor_name_kv = kv; + } + } + break; + } + last_key_id = kv->key.id; + } + + if (ne->vendor_name_kv) { + kv = ne->vendor_name_kv; + ne->vendor_name_kv = vendor_name_kv; + csr1212_release_keyval(kv); + } else if (vendor_name_kv) { + ne->vendor_name_kv = vendor_name_kv; + if (device_create_file(&ne->device, + &dev_attr_ne_vendor_name_kv) != 0) + HPSB_ERR("Failed to add sysfs attribute"); + } +} + +#ifdef CONFIG_HOTPLUG + +static int nodemgr_uevent(struct device *dev, struct kobj_uevent_env *env) +{ + struct unit_directory *ud; + int retval = 0; + /* ieee1394:venNmoNspNverN */ + char buf[8 + 1 + 3 + 8 + 2 + 8 + 2 + 8 + 3 + 8 + 1]; + + if (!dev) + return -ENODEV; + + ud = container_of(dev, struct unit_directory, unit_dev); + + if (ud->ne->in_limbo || ud->ignore_driver) + return -ENODEV; + +#define PUT_ENVP(fmt,val) \ +do { \ + retval = add_uevent_var(env, fmt, val); \ + if (retval) \ + return retval; \ +} while (0) + + PUT_ENVP("VENDOR_ID=%06x", ud->vendor_id); + PUT_ENVP("MODEL_ID=%06x", ud->model_id); + PUT_ENVP("GUID=%016Lx", (unsigned long long)ud->ne->guid); + PUT_ENVP("SPECIFIER_ID=%06x", ud->specifier_id); + PUT_ENVP("VERSION=%06x", ud->version); + snprintf(buf, sizeof(buf), "ieee1394:ven%08Xmo%08Xsp%08Xver%08X", + ud->vendor_id, + ud->model_id, + ud->specifier_id, + ud->version); + PUT_ENVP("MODALIAS=%s", buf); + +#undef PUT_ENVP + + return 0; +} + +#else + +static int nodemgr_uevent(struct device *dev, struct kobj_uevent_env *env) +{ + return -ENODEV; +} + +#endif /* CONFIG_HOTPLUG */ + + +int __hpsb_register_protocol(struct hpsb_protocol_driver *drv, + struct module *owner) +{ + int error; + + drv->driver.bus = &ieee1394_bus_type; + drv->driver.owner = owner; + drv->driver.name = drv->name; + + /* This will cause a probe for devices */ + error = driver_register(&drv->driver); + if (!error) + nodemgr_create_drv_files(drv); + return error; +} + +void hpsb_unregister_protocol(struct hpsb_protocol_driver *driver) +{ + nodemgr_remove_drv_files(driver); + /* This will subsequently disconnect all devices that our driver + * is attached to. */ + driver_unregister(&driver->driver); +} + + +/* + * This function updates nodes that were present on the bus before the + * reset and still are after the reset. The nodeid and the config rom + * may have changed, and the drivers managing this device must be + * informed that this device just went through a bus reset, to allow + * the to take whatever actions required. + */ +static void nodemgr_update_node(struct node_entry *ne, struct csr1212_csr *csr, + nodeid_t nodeid, unsigned int generation) +{ + if (ne->nodeid != nodeid) { + HPSB_DEBUG("Node changed: " NODE_BUS_FMT " -> " NODE_BUS_FMT, + NODE_BUS_ARGS(ne->host, ne->nodeid), + NODE_BUS_ARGS(ne->host, nodeid)); + ne->nodeid = nodeid; + } + + if (ne->busopt.generation != ((be32_to_cpu(csr->bus_info_data[2]) >> 4) & 0xf)) { + kfree(ne->csr->private); + csr1212_destroy_csr(ne->csr); + ne->csr = csr; + + /* If the node's configrom generation has changed, we + * unregister all the unit directories. */ + nodemgr_remove_uds(ne); + + nodemgr_update_bus_options(ne); + + /* Mark the node as new, so it gets re-probed */ + ne->needs_probe = true; + } else { + /* old cache is valid, so update its generation */ + struct nodemgr_csr_info *ci = ne->csr->private; + ci->generation = generation; + /* free the partially filled now unneeded new cache */ + kfree(csr->private); + csr1212_destroy_csr(csr); + } + + /* Mark the node current */ + ne->generation = generation; + + if (ne->in_limbo) { + device_remove_file(&ne->device, &dev_attr_ne_in_limbo); + ne->in_limbo = false; + + HPSB_DEBUG("Node reactivated: " + "ID:BUS[" NODE_BUS_FMT "] GUID[%016Lx]", + NODE_BUS_ARGS(ne->host, ne->nodeid), + (unsigned long long)ne->guid); + } +} + +static void nodemgr_node_scan_one(struct hpsb_host *host, + nodeid_t nodeid, int generation) +{ + struct node_entry *ne; + octlet_t guid; + struct csr1212_csr *csr; + struct nodemgr_csr_info *ci; + u8 *speed; + + ci = kmalloc(sizeof(*ci), GFP_KERNEL); + if (!ci) + return; + + ci->host = host; + ci->nodeid = nodeid; + ci->generation = generation; + + /* Prepare for speed probe which occurs when reading the ROM */ + speed = &(host->speed[NODEID_TO_NODE(nodeid)]); + if (*speed > host->csr.lnk_spd) + *speed = host->csr.lnk_spd; + ci->speed_unverified = *speed > IEEE1394_SPEED_100; + + /* We need to detect when the ConfigROM's generation has changed, + * so we only update the node's info when it needs to be. */ + + csr = csr1212_create_csr(&nodemgr_csr_ops, 5 * sizeof(quadlet_t), ci); + if (!csr || csr1212_parse_csr(csr) != CSR1212_SUCCESS) { + HPSB_ERR("Error parsing configrom for node " NODE_BUS_FMT, + NODE_BUS_ARGS(host, nodeid)); + if (csr) + csr1212_destroy_csr(csr); + kfree(ci); + return; + } + + if (csr->bus_info_data[1] != IEEE1394_BUSID_MAGIC) { + /* This isn't a 1394 device, but we let it slide. There + * was a report of a device with broken firmware which + * reported '2394' instead of '1394', which is obviously a + * mistake. One would hope that a non-1394 device never + * gets connected to Firewire bus. If someone does, we + * shouldn't be held responsible, so we'll allow it with a + * warning. */ + HPSB_WARN("Node " NODE_BUS_FMT " has invalid busID magic [0x%08x]", + NODE_BUS_ARGS(host, nodeid), csr->bus_info_data[1]); + } + + guid = ((u64)be32_to_cpu(csr->bus_info_data[3]) << 32) | be32_to_cpu(csr->bus_info_data[4]); + ne = find_entry_by_guid(guid); + + if (ne && ne->host != host && ne->in_limbo) { + /* Must have moved this device from one host to another */ + nodemgr_remove_ne(ne); + ne = NULL; + } + + if (!ne) + nodemgr_create_node(guid, csr, host, nodeid, generation); + else + nodemgr_update_node(ne, csr, nodeid, generation); +} + + +static void nodemgr_node_scan(struct hpsb_host *host, int generation) +{ + int count; + struct selfid *sid = (struct selfid *)host->topology_map; + nodeid_t nodeid = LOCAL_BUS; + + /* Scan each node on the bus */ + for (count = host->selfid_count; count; count--, sid++) { + if (sid->extended) + continue; + + if (!sid->link_active) { + nodeid++; + continue; + } + nodemgr_node_scan_one(host, nodeid++, generation); + } +} + +static void nodemgr_pause_ne(struct node_entry *ne) +{ + HPSB_DEBUG("Node paused: ID:BUS[" NODE_BUS_FMT "] GUID[%016Lx]", + NODE_BUS_ARGS(ne->host, ne->nodeid), + (unsigned long long)ne->guid); + + ne->in_limbo = true; + WARN_ON(device_create_file(&ne->device, &dev_attr_ne_in_limbo)); +} + +static int update_pdrv(struct device *dev, void *data) +{ + struct unit_directory *ud; + struct device_driver *drv; + struct hpsb_protocol_driver *pdrv; + struct node_entry *ne = data; + int error; + + ud = container_of(dev, struct unit_directory, unit_dev); + if (ud->ne == ne) { + drv = get_driver(ud->device.driver); + if (drv) { + error = 0; + pdrv = container_of(drv, struct hpsb_protocol_driver, + driver); + if (pdrv->update) { + down(&ud->device.sem); + error = pdrv->update(ud); + up(&ud->device.sem); + } + if (error) + device_release_driver(&ud->device); + put_driver(drv); + } + } + + return 0; +} + +static void nodemgr_update_pdrv(struct node_entry *ne) +{ + class_for_each_device(&nodemgr_ud_class, NULL, ne, update_pdrv); +} + +/* Write the BROADCAST_CHANNEL as per IEEE1394a 8.3.2.3.11 and 8.4.2.3. This + * seems like an optional service but in the end it is practically mandatory + * as a consequence of these clauses. + * + * Note that we cannot do a broadcast write to all nodes at once because some + * pre-1394a devices would hang. */ +static void nodemgr_irm_write_bc(struct node_entry *ne, int generation) +{ + const u64 bc_addr = (CSR_REGISTER_BASE | CSR_BROADCAST_CHANNEL); + quadlet_t bc_remote, bc_local; + int error; + + if (!ne->host->is_irm || ne->generation != generation || + ne->nodeid == ne->host->node_id) + return; + + bc_local = cpu_to_be32(ne->host->csr.broadcast_channel); + + /* Check if the register is implemented and 1394a compliant. */ + error = hpsb_read(ne->host, ne->nodeid, generation, bc_addr, &bc_remote, + sizeof(bc_remote)); + if (!error && bc_remote & cpu_to_be32(0x80000000) && + bc_remote != bc_local) + hpsb_node_write(ne, bc_addr, &bc_local, sizeof(bc_local)); +} + + +static void nodemgr_probe_ne(struct hpsb_host *host, struct node_entry *ne, + int generation) +{ + struct device *dev; + + if (ne->host != host || ne->in_limbo) + return; + + dev = get_device(&ne->device); + if (!dev) + return; + + nodemgr_irm_write_bc(ne, generation); + + /* If "needs_probe", then this is either a new or changed node we + * rescan totally. If the generation matches for an existing node + * (one that existed prior to the bus reset) we send update calls + * down to the drivers. Otherwise, this is a dead node and we + * suspend it. */ + if (ne->needs_probe) + nodemgr_process_root_directory(ne); + else if (ne->generation == generation) + nodemgr_update_pdrv(ne); + else + nodemgr_pause_ne(ne); + + put_device(dev); +} + +struct node_probe_parameter { + struct hpsb_host *host; + int generation; + bool probe_now; +}; + +static int node_probe(struct device *dev, void *data) +{ + struct node_probe_parameter *p = data; + struct node_entry *ne; + + if (p->generation != get_hpsb_generation(p->host)) + return -EAGAIN; + + ne = container_of(dev, struct node_entry, node_dev); + if (ne->needs_probe == p->probe_now) + nodemgr_probe_ne(p->host, ne, p->generation); + return 0; +} + +static int nodemgr_node_probe(struct hpsb_host *host, int generation) +{ + struct node_probe_parameter p; + + p.host = host; + p.generation = generation; + /* + * Do some processing of the nodes we've probed. This pulls them + * into the sysfs layer if needed, and can result in processing of + * unit-directories, or just updating the node and it's + * unit-directories. + * + * Run updates before probes. Usually, updates are time-critical + * while probes are time-consuming. + * + * Meanwhile, another bus reset may have happened. In this case we + * skip everything here and let the next bus scan handle it. + * Otherwise we may prematurely remove nodes which are still there. + */ + p.probe_now = false; + if (class_for_each_device(&nodemgr_ne_class, NULL, &p, node_probe) != 0) + return 0; + + p.probe_now = true; + if (class_for_each_device(&nodemgr_ne_class, NULL, &p, node_probe) != 0) + return 0; + /* + * Now let's tell the bus to rescan our devices. This may seem + * like overhead, but the driver-model core will only scan a + * device for a driver when either the device is added, or when a + * new driver is added. A bus reset is a good reason to rescan + * devices that were there before. For example, an sbp2 device + * may become available for login, if the host that held it was + * just removed. + */ + if (bus_rescan_devices(&ieee1394_bus_type) != 0) + HPSB_DEBUG("bus_rescan_devices had an error"); + + return 1; +} + +static int remove_nodes_in_limbo(struct device *dev, void *data) +{ + struct node_entry *ne; + + if (dev->bus != &ieee1394_bus_type) + return 0; + + ne = container_of(dev, struct node_entry, device); + if (ne->in_limbo) + nodemgr_remove_ne(ne); + + return 0; +} + +static void nodemgr_remove_nodes_in_limbo(struct hpsb_host *host) +{ + device_for_each_child(&host->device, NULL, remove_nodes_in_limbo); +} + +static int nodemgr_send_resume_packet(struct hpsb_host *host) +{ + struct hpsb_packet *packet; + int error = -ENOMEM; + + packet = hpsb_make_phypacket(host, + EXTPHYPACKET_TYPE_RESUME | + NODEID_TO_NODE(host->node_id) << PHYPACKET_PORT_SHIFT); + if (packet) { + packet->no_waiter = 1; + packet->generation = get_hpsb_generation(host); + error = hpsb_send_packet(packet); + } + if (error) + HPSB_WARN("fw-host%d: Failed to broadcast resume packet", + host->id); + return error; +} + +/* Perform a few high-level IRM responsibilities. */ +static int nodemgr_do_irm_duties(struct hpsb_host *host, int cycles) +{ + quadlet_t bc; + + /* if irm_id == -1 then there is no IRM on this bus */ + if (!host->is_irm || host->irm_id == (nodeid_t)-1) + return 1; + + /* We are a 1394a-2000 compliant IRM. Set the validity bit. */ + host->csr.broadcast_channel |= 0x40000000; + + /* If there is no bus manager then we should set the root node's + * force_root bit to promote bus stability per the 1394 + * spec. (8.4.2.6) */ + if (host->busmgr_id == 0xffff && host->node_count > 1) + { + u16 root_node = host->node_count - 1; + + /* get cycle master capability flag from root node */ + if (host->is_cycmst || + (!hpsb_read(host, LOCAL_BUS | root_node, get_hpsb_generation(host), + (CSR_REGISTER_BASE + CSR_CONFIG_ROM + 2 * sizeof(quadlet_t)), + &bc, sizeof(quadlet_t)) && + be32_to_cpu(bc) & 1 << CSR_CMC_SHIFT)) + hpsb_send_phy_config(host, root_node, -1); + else { + HPSB_DEBUG("The root node is not cycle master capable; " + "selecting a new root node and resetting..."); + + if (cycles >= 5) { + /* Oh screw it! Just leave the bus as it is */ + HPSB_DEBUG("Stopping reset loop for IRM sanity"); + return 1; + } + + hpsb_send_phy_config(host, NODEID_TO_NODE(host->node_id), -1); + hpsb_reset_bus(host, LONG_RESET_FORCE_ROOT); + + return 0; + } + } + + /* Some devices suspend their ports while being connected to an inactive + * host adapter, i.e. if connected before the low-level driver is + * loaded. They become visible either when physically unplugged and + * replugged, or when receiving a resume packet. Send one once. */ + if (!host->resume_packet_sent && !nodemgr_send_resume_packet(host)) + host->resume_packet_sent = 1; + + return 1; +} + +/* We need to ensure that if we are not the IRM, that the IRM node is capable of + * everything we can do, otherwise issue a bus reset and try to become the IRM + * ourselves. */ +static int nodemgr_check_irm_capability(struct hpsb_host *host, int cycles) +{ + quadlet_t bc; + int status; + + if (hpsb_disable_irm || host->is_irm) + return 1; + + status = hpsb_read(host, LOCAL_BUS | (host->irm_id), + get_hpsb_generation(host), + (CSR_REGISTER_BASE | CSR_BROADCAST_CHANNEL), + &bc, sizeof(quadlet_t)); + + if (status < 0 || !(be32_to_cpu(bc) & 0x80000000)) { + /* The current irm node does not have a valid BROADCAST_CHANNEL + * register and we do, so reset the bus with force_root set */ + HPSB_DEBUG("Current remote IRM is not 1394a-2000 compliant, resetting..."); + + if (cycles >= 5) { + /* Oh screw it! Just leave the bus as it is */ + HPSB_DEBUG("Stopping reset loop for IRM sanity"); + return 1; + } + + hpsb_send_phy_config(host, NODEID_TO_NODE(host->node_id), -1); + hpsb_reset_bus(host, LONG_RESET_FORCE_ROOT); + + return 0; + } + + return 1; +} + +static int nodemgr_host_thread(void *data) +{ + struct hpsb_host *host = data; + unsigned int g, generation = 0; + int i, reset_cycles = 0; + + set_freezable(); + /* Setup our device-model entries */ + nodemgr_create_host_dev_files(host); + + for (;;) { + /* Sleep until next bus reset */ + set_current_state(TASK_INTERRUPTIBLE); + if (get_hpsb_generation(host) == generation && + !kthread_should_stop()) + schedule(); + __set_current_state(TASK_RUNNING); + + /* Thread may have been woken up to freeze or to exit */ + if (try_to_freeze()) + continue; + if (kthread_should_stop()) + goto exit; + + /* Pause for 1/4 second in 1/16 second intervals, + * to make sure things settle down. */ + g = get_hpsb_generation(host); + for (i = 0; i < 4 ; i++) { + msleep_interruptible(63); + try_to_freeze(); + if (kthread_should_stop()) + goto exit; + + /* Now get the generation in which the node ID's we collect + * are valid. During the bus scan we will use this generation + * for the read transactions, so that if another reset occurs + * during the scan the transactions will fail instead of + * returning bogus data. */ + generation = get_hpsb_generation(host); + + /* If we get a reset before we are done waiting, then + * start the waiting over again */ + if (generation != g) + g = generation, i = 0; + } + + if (!nodemgr_check_irm_capability(host, reset_cycles) || + !nodemgr_do_irm_duties(host, reset_cycles)) { + reset_cycles++; + continue; + } + reset_cycles = 0; + + /* Scan our nodes to get the bus options and create node + * entries. This does not do the sysfs stuff, since that + * would trigger uevents and such, which is a bad idea at + * this point. */ + nodemgr_node_scan(host, generation); + + /* This actually does the full probe, with sysfs + * registration. */ + if (!nodemgr_node_probe(host, generation)) + continue; + + /* Update some of our sysfs symlinks */ + nodemgr_update_host_dev_links(host); + + /* Sleep 3 seconds */ + for (i = 3000/200; i; i--) { + msleep_interruptible(200); + try_to_freeze(); + if (kthread_should_stop()) + goto exit; + + if (generation != get_hpsb_generation(host)) + break; + } + /* Remove nodes which are gone, unless a bus reset happened */ + if (!i) + nodemgr_remove_nodes_in_limbo(host); + } +exit: + HPSB_VERBOSE("NodeMgr: Exiting thread"); + return 0; +} + +struct per_host_parameter { + void *data; + int (*cb)(struct hpsb_host *, void *); +}; + +static int per_host(struct device *dev, void *data) +{ + struct hpsb_host *host; + struct per_host_parameter *p = data; + + host = container_of(dev, struct hpsb_host, host_dev); + return p->cb(host, p->data); +} + +/** + * nodemgr_for_each_host - call a function for each IEEE 1394 host + * @data: an address to supply to the callback + * @cb: function to call for each host + * + * Iterate the hosts, calling a given function with supplied data for each host. + * If the callback fails on a host, i.e. if it returns a non-zero value, the + * iteration is stopped. + * + * Return value: 0 on success, non-zero on failure (same as returned by last run + * of the callback). + */ +int nodemgr_for_each_host(void *data, int (*cb)(struct hpsb_host *, void *)) +{ + struct per_host_parameter p; + + p.cb = cb; + p.data = data; + return class_for_each_device(&hpsb_host_class, NULL, &p, per_host); +} + +/* The following two convenience functions use a struct node_entry + * for addressing a node on the bus. They are intended for use by any + * process context, not just the nodemgr thread, so we need to be a + * little careful when reading out the node ID and generation. The + * thing that can go wrong is that we get the node ID, then a bus + * reset occurs, and then we read the generation. The node ID is + * possibly invalid, but the generation is current, and we end up + * sending a packet to a the wrong node. + * + * The solution is to make sure we read the generation first, so that + * if a reset occurs in the process, we end up with a stale generation + * and the transactions will fail instead of silently using wrong node + * ID's. + */ + +/** + * hpsb_node_fill_packet - fill some destination information into a packet + * @ne: destination node + * @packet: packet to fill in + * + * This will fill in the given, pre-initialised hpsb_packet with the current + * information from the node entry (host, node ID, bus generation number). + */ +void hpsb_node_fill_packet(struct node_entry *ne, struct hpsb_packet *packet) +{ + packet->host = ne->host; + packet->generation = ne->generation; + barrier(); + packet->node_id = ne->nodeid; +} + +int hpsb_node_write(struct node_entry *ne, u64 addr, + quadlet_t *buffer, size_t length) +{ + unsigned int generation = ne->generation; + + barrier(); + return hpsb_write(ne->host, ne->nodeid, generation, + addr, buffer, length); +} + +static void nodemgr_add_host(struct hpsb_host *host) +{ + struct host_info *hi; + + hi = hpsb_create_hostinfo(&nodemgr_highlevel, host, sizeof(*hi)); + if (!hi) { + HPSB_ERR("NodeMgr: out of memory in add host"); + return; + } + hi->host = host; + hi->thread = kthread_run(nodemgr_host_thread, host, "knodemgrd_%d", + host->id); + if (IS_ERR(hi->thread)) { + HPSB_ERR("NodeMgr: cannot start thread for host %d", host->id); + hpsb_destroy_hostinfo(&nodemgr_highlevel, host); + } +} + +static void nodemgr_host_reset(struct hpsb_host *host) +{ + struct host_info *hi = hpsb_get_hostinfo(&nodemgr_highlevel, host); + + if (hi) { + HPSB_VERBOSE("NodeMgr: Processing reset for host %d", host->id); + wake_up_process(hi->thread); + } +} + +static void nodemgr_remove_host(struct hpsb_host *host) +{ + struct host_info *hi = hpsb_get_hostinfo(&nodemgr_highlevel, host); + + if (hi) { + kthread_stop(hi->thread); + nodemgr_remove_host_dev(&host->device); + } +} + +static struct hpsb_highlevel nodemgr_highlevel = { + .name = "Node manager", + .add_host = nodemgr_add_host, + .host_reset = nodemgr_host_reset, + .remove_host = nodemgr_remove_host, +}; + +int init_ieee1394_nodemgr(void) +{ + int error; + + error = class_register(&nodemgr_ne_class); + if (error) + goto fail_ne; + error = class_register(&nodemgr_ud_class); + if (error) + goto fail_ud; + error = driver_register(&nodemgr_mid_layer_driver); + if (error) + goto fail_ml; + /* This driver is not used if nodemgr is off (disable_nodemgr=1). */ + nodemgr_dev_template_host.driver = &nodemgr_mid_layer_driver; + + hpsb_register_highlevel(&nodemgr_highlevel); + return 0; + +fail_ml: + class_unregister(&nodemgr_ud_class); +fail_ud: + class_unregister(&nodemgr_ne_class); +fail_ne: + return error; +} + +void cleanup_ieee1394_nodemgr(void) +{ + hpsb_unregister_highlevel(&nodemgr_highlevel); + driver_unregister(&nodemgr_mid_layer_driver); + class_unregister(&nodemgr_ud_class); + class_unregister(&nodemgr_ne_class); +} |
