diff options
Diffstat (limited to 'drivers/ieee1394/nodemgr.c')
| -rw-r--r-- | drivers/ieee1394/nodemgr.c | 1732 |
1 files changed, 1732 insertions, 0 deletions
diff --git a/drivers/ieee1394/nodemgr.c b/drivers/ieee1394/nodemgr.c new file mode 100644 index 000000000000..a1e30a66297b --- /dev/null +++ b/drivers/ieee1394/nodemgr.c @@ -0,0 +1,1732 @@ +/* + * 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/kernel.h> +#include <linux/config.h> +#include <linux/list.h> +#include <linux/slab.h> +#include <linux/smp_lock.h> +#include <linux/interrupt.h> +#include <linux/kmod.h> +#include <linux/completion.h> +#include <linux/delay.h> +#include <linux/pci.h> +#include <linux/moduleparam.h> +#include <asm/atomic.h> + +#include "ieee1394_types.h" +#include "ieee1394.h" +#include "ieee1394_core.h" +#include "hosts.h" +#include "ieee1394_transactions.h" +#include "highlevel.h" +#include "csr.h" +#include "nodemgr.h" + +static int ignore_drivers = 0; +module_param(ignore_drivers, int, 0444); +MODULE_PARM_DESC(ignore_drivers, "Disable automatic probing for drivers."); + +struct nodemgr_csr_info { + struct hpsb_host *host; + nodeid_t nodeid; + unsigned int generation; +}; + + +static char *nodemgr_find_oui_name(int oui) +{ +#ifdef CONFIG_IEEE1394_OUI_DB + extern struct oui_list_struct { + int oui; + char *name; + } oui_list[]; + int i; + + for (i = 0; oui_list[i].name; i++) + if (oui_list[i].oui == oui) + return oui_list[i].name; +#endif + return NULL; +} + + +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, ret = 0; + + for (i = 0; i < 3; i++) { + ret = hpsb_read(ci->host, ci->nodeid, ci->generation, addr, + buffer, length); + if (!ret) + break; + + if (msleep_interruptible(334)) + return -EINTR; + } + + return ret; +} + +static int nodemgr_get_max_rom(quadlet_t *bus_info_data, void *__ci) +{ + return (CSR1212_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. + */ + +static DECLARE_MUTEX(nodemgr_serialize); + +struct host_info { + struct hpsb_host *host; + struct list_head list; + struct completion exited; + struct semaphore reset_sem; + int pid; + char daemon_name[15]; + int kill_me; +}; + +static int nodemgr_bus_match(struct device * dev, struct device_driver * drv); +static int nodemgr_hotplug(struct class_device *cdev, char **envp, int num_envp, + char *buffer, int buffer_size); +static void nodemgr_resume_ne(struct node_entry *ne); +static void nodemgr_remove_ne(struct node_entry *ne); +static struct node_entry *find_entry_by_guid(u64 guid); + +struct bus_type ieee1394_bus_type = { + .name = "ieee1394", + .match = nodemgr_bus_match, +}; + +static void host_cls_release(struct class_device *class_dev) +{ + put_device(&container_of((class_dev), struct hpsb_host, class_dev)->device); +} + +struct class hpsb_host_class = { + .name = "ieee1394_host", + .release = host_cls_release, +}; + +static void ne_cls_release(struct class_device *class_dev) +{ + put_device(&container_of((class_dev), struct node_entry, class_dev)->device); +} + +static struct class nodemgr_ne_class = { + .name = "ieee1394_node", + .release = ne_cls_release, +}; + +static void ud_cls_release(struct class_device *class_dev) +{ + put_device(&container_of((class_dev), struct unit_directory, class_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", + .release = ud_cls_release, + .hotplug = nodemgr_hotplug, +}; + +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, +}; + +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, 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, 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, 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); + + +static ssize_t fw_show_ne_tlabels_free(struct device *dev, char *buf) +{ + struct node_entry *ne = container_of(dev, struct node_entry, device); + return sprintf(buf, "%d\n", atomic_read(&ne->tpool->count.count) + 1); +} +static DEVICE_ATTR(tlabels_free,S_IRUGO,fw_show_ne_tlabels_free,NULL); + + +static ssize_t fw_show_ne_tlabels_allocations(struct device *dev, char *buf) +{ + struct node_entry *ne = container_of(dev, struct node_entry, device); + return sprintf(buf, "%u\n", ne->tpool->allocations); +} +static DEVICE_ATTR(tlabels_allocations,S_IRUGO,fw_show_ne_tlabels_allocations,NULL); + + +static ssize_t fw_show_ne_tlabels_mask(struct device *dev, char *buf) +{ + struct node_entry *ne = container_of(dev, struct node_entry, device); +#if (BITS_PER_LONG <= 32) + return sprintf(buf, "0x%08lx%08lx\n", ne->tpool->pool[0], ne->tpool->pool[1]); +#else + return sprintf(buf, "0x%016lx\n", ne->tpool->pool[0]); +#endif +} +static DEVICE_ATTR(tlabels_mask, S_IRUGO, fw_show_ne_tlabels_mask, NULL); + + +static ssize_t fw_set_ignore_driver(struct device *dev, 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) { + down_write(&dev->bus->subsys.rwsem); + device_release_driver(dev); + ud->ignore_driver = 1; + up_write(&dev->bus->subsys.rwsem); + } else if (!state) + ud->ignore_driver = 0; + + return count; +} +static ssize_t fw_get_ignore_driver(struct device *dev, 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_destroy_node(struct bus_type *bus, const char *buf, size_t count) +{ + struct node_entry *ne; + u64 guid = (u64)simple_strtoull(buf, NULL, 16); + + ne = find_entry_by_guid(guid); + + if (ne == NULL || !ne->in_limbo) + return -EINVAL; + + nodemgr_remove_ne(ne); + + return count; +} +static ssize_t fw_get_destroy_node(struct bus_type *bus, char *buf) +{ + return sprintf(buf, "You can destroy in_limbo nodes by writing their GUID to this file\n"); +} +static BUS_ATTR(destroy_node, S_IWUSR | S_IRUGO, fw_get_destroy_node, fw_set_destroy_node); + +static int nodemgr_rescan_bus_thread(void *__unused) +{ + /* No userlevel access needed */ + daemonize("kfwrescan"); + + bus_rescan_devices(&ieee1394_bus_type); + + return 0; +} + +static ssize_t fw_set_rescan(struct bus_type *bus, const char *buf, size_t count) +{ + int state = simple_strtoul(buf, NULL, 10); + + /* Don't wait for this, or care about errors. Root could do + * something stupid and spawn this a lot of times, but that's + * root's fault. */ + if (state == 1) + kernel_thread(nodemgr_rescan_bus_thread, NULL, CLONE_KERNEL); + + return 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) + 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_destroy_node, + &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, vendor_oui, const char *, "%s\n") + +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, guid_vendor_oui, const char *, "%s\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, + &dev_attr_tlabels_free, + &dev_attr_tlabels_allocations, + &dev_attr_tlabels_mask, +}; + + + +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(ud, struct unit_directory, vendor_oui, const char *, "%s\n") +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); + + for (id = driver->id_table; 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++) + driver_create_file(drv, fw_drv_attrs[i]); +} + + +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++) + device_create_file(dev, fw_ne_attrs[i]); +} + + +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++) + device_create_file(dev, fw_host_attrs[i]); +} + + +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"); + if ((ne = find_entry_by_nodeid(host, host->busmgr_id))) + sysfs_create_link(&dev->kobj, &ne->device.kobj, "busmgr_id"); + if ((ne = find_entry_by_nodeid(host, host->node_id))) + sysfs_create_link(&dev->kobj, &ne->device.kobj, "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++) + device_create_file(dev, fw_ud_attrs[i]); + + if (ud->flags & UNIT_DIRECTORY_SPECIFIER_ID) + device_create_file(dev, &dev_attr_ud_specifier_id); + + if (ud->flags & UNIT_DIRECTORY_VERSION) + device_create_file(dev, &dev_attr_ud_version); + + if (ud->flags & UNIT_DIRECTORY_VENDOR_ID) { + device_create_file(dev, &dev_attr_ud_vendor_id); + if (ud->vendor_name_kv) + device_create_file(dev, &dev_attr_ud_vendor_name_kv); + } + + if (ud->flags & UNIT_DIRECTORY_MODEL_ID) { + device_create_file(dev, &dev_attr_ud_model_id); + if (ud->model_name_kv) + device_create_file(dev, &dev_attr_ud_model_name_kv); + } +} + + +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); + driver = container_of(drv, struct hpsb_protocol_driver, driver); + + if (ud->ne->in_limbo || ud->ignore_driver) + return 0; + + for (id = driver->id_table; 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 void nodemgr_remove_uds(struct node_entry *ne) +{ + struct class_device *cdev, *next; + struct unit_directory *ud; + + list_for_each_entry_safe(cdev, next, &nodemgr_ud_class.children, node) { + ud = container_of(cdev, struct unit_directory, class_dev); + + if (ud->ne != ne) + continue; + + class_device_unregister(&ud->class_dev); + device_unregister(&ud->device); + } +} + + +static void nodemgr_remove_ne(struct node_entry *ne) +{ + struct device *dev = &ne->device; + + 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); + + class_device_unregister(&ne->class_dev); + device_unregister(dev); + + put_device(dev); +} + + +static void nodemgr_remove_host_dev(struct device *dev) +{ + struct device *ne_dev, *next; + + list_for_each_entry_safe(ne_dev, next, &dev->children, node) + nodemgr_remove_ne(container_of(ne_dev, struct node_entry, device)); + + 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 host_info *hi, nodeid_t nodeid, + unsigned int generation) +{ + struct hpsb_host *host = hi->host; + struct node_entry *ne; + + ne = kmalloc(sizeof(struct node_entry), GFP_KERNEL); + if (!ne) return NULL; + + memset(ne, 0, sizeof(struct node_entry)); + + ne->tpool = &host->tpool[nodeid & NODE_MASK]; + + ne->host = host; + ne->nodeid = nodeid; + ne->generation = generation; + ne->needs_probe = 1; + + ne->guid = guid; + ne->guid_vendor_id = (guid >> 40) & 0xffffff; + ne->guid_vendor_oui = nodemgr_find_oui_name(ne->guid_vendor_id); + ne->csr = csr; + + memcpy(&ne->device, &nodemgr_dev_template_ne, + sizeof(ne->device)); + ne->device.parent = &host->device; + snprintf(ne->device.bus_id, BUS_ID_SIZE, "%016Lx", + (unsigned long long)(ne->guid)); + + ne->class_dev.dev = &ne->device; + ne->class_dev.class = &nodemgr_ne_class; + snprintf(ne->class_dev.class_id, BUS_ID_SIZE, "%016Lx", + (unsigned long long)(ne->guid)); + + device_register(&ne->device); + class_device_register(&ne->class_dev); + get_device(&ne->device); + + if (ne->guid_vendor_oui) + device_create_file(&ne->device, &dev_attr_ne_guid_vendor_oui); + 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; +} + + +static struct node_entry *find_entry_by_guid(u64 guid) +{ + struct class *class = &nodemgr_ne_class; + struct class_device *cdev; + struct node_entry *ne, *ret_ne = NULL; + + down_read(&class->subsys.rwsem); + list_for_each_entry(cdev, &class->children, node) { + ne = container_of(cdev, struct node_entry, class_dev); + + if (ne->guid == guid) { + ret_ne = ne; + break; + } + } + up_read(&class->subsys.rwsem); + + return ret_ne; +} + + +static struct node_entry *find_entry_by_nodeid(struct hpsb_host *host, nodeid_t nodeid) +{ + struct class *class = &nodemgr_ne_class; + struct class_device *cdev; + struct node_entry *ne, *ret_ne = NULL; + + down_read(&class->subsys.rwsem); + list_for_each_entry(cdev, &class->children, node) { + ne = container_of(cdev, struct node_entry, class_dev); + + if (ne->host == host && ne->nodeid == nodeid) { + ret_ne = ne; + break; + } + } + up_read(&class->subsys.rwsem); + + return ret_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; + + snprintf(ud->device.bus_id, BUS_ID_SIZE, "%s-%u", + ne->device.bus_id, ud->id); + + ud->class_dev.dev = &ud->device; + ud->class_dev.class = &nodemgr_ud_class; + snprintf(ud->class_dev.class_id, BUS_ID_SIZE, "%s-%u", + ne->device.bus_id, ud->id); + + device_register(&ud->device); + class_device_register(&ud->class_dev); + get_device(&ud->device); + + if (ud->vendor_oui) + device_create_file(&ud->device, &dev_attr_ud_vendor_oui); + nodemgr_create_ud_dev_files(ud); +} + + +/* 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 host_info *hi, 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 = kmalloc(sizeof(struct unit_directory), GFP_KERNEL); + if (!ud) + goto unit_directory_error; + + memset (ud, 0, sizeof(struct unit_directory)); + + ud->ne = ne; + ud->ignore_driver = ignore_drivers; + ud->address = ud_kv->offset + CSR1212_CONFIG_ROM_SPACE_BASE; + 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; + + if (ud->vendor_id) + ud->vendor_oui = nodemgr_find_oui_name(ud->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: + ud->vendor_name_kv = kv; + csr1212_keep_keyval(kv); + break; + + case CSR1212_KV_ID_MODEL: + ud->model_name_kv = kv; + csr1212_keep_keyval(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 = kmalloc(sizeof(struct unit_directory), GFP_KERNEL); + if (!ud_child) + goto unit_directory_error; + memcpy(ud_child, ud, sizeof(struct unit_directory)); + 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(hi, ne, kv, id, ud); + + if (ud_child == NULL) + break; + + /* inherit unspecified values so hotplug 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; + + 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: + if (ud != NULL) + kfree(ud); + return NULL; +} + + +static void nodemgr_process_root_directory(struct host_info *hi, struct node_entry *ne) +{ + unsigned int ud_id = 0; + struct csr1212_dentry *dentry; + struct csr1212_keyval *kv; + u8 last_key_id = 0; + + ne->needs_probe = 0; + + 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; + + if (ne->vendor_id) + ne->vendor_oui = nodemgr_find_oui_name(ne->vendor_id); + break; + + case CSR1212_KV_ID_NODE_CAPABILITIES: + ne->capabilities = kv->value.immediate; + break; + + case CSR1212_KV_ID_UNIT: + nodemgr_process_unit_directory(hi, 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) { + ne->vendor_name_kv = kv; + csr1212_keep_keyval(kv); + } + } + break; + } + last_key_id = kv->key.id; + } + + if (ne->vendor_oui) + device_create_file(&ne->device, &dev_attr_ne_vendor_oui); + if (ne->vendor_name_kv) + device_create_file(&ne->device, &dev_attr_ne_vendor_name_kv); +} + +#ifdef CONFIG_HOTPLUG + +static int nodemgr_hotplug(struct class_device *cdev, char **envp, int num_envp, + char *buffer, int buffer_size) +{ + struct unit_directory *ud; + int i = 0; + int length = 0; + + if (!cdev) + return -ENODEV; + + ud = container_of(cdev, struct unit_directory, class_dev); + + if (ud->ne->in_limbo || ud->ignore_driver) + return -ENODEV; + +#define PUT_ENVP(fmt,val) \ +do { \ + int printed; \ + envp[i++] = buffer; \ + printed = snprintf(buffer, buffer_size - length, \ + fmt, val); \ + if ((buffer_size - (length+printed) <= 0) || (i >= num_envp)) \ + return -ENOMEM; \ + length += printed+1; \ + buffer += printed+1; \ +} 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); + +#undef PUT_ENVP + + envp[i] = NULL; + + return 0; +} + +#else + +static int nodemgr_hotplug(struct class_device *cdev, char **envp, int num_envp, + char *buffer, int buffer_size) +{ + return -ENODEV; +} + +#endif /* CONFIG_HOTPLUG */ + + +int hpsb_register_protocol(struct hpsb_protocol_driver *driver) +{ + int ret; + + /* This will cause a probe for devices */ + ret = driver_register(&driver->driver); + if (!ret) + nodemgr_create_drv_files(driver); + + return ret; +} + +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, + struct host_info *hi, 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 = 1; + } 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); + } + + if (ne->in_limbo) + nodemgr_resume_ne(ne); + + /* Mark the node current */ + ne->generation = generation; +} + + + +static void nodemgr_node_scan_one(struct host_info *hi, + nodeid_t nodeid, int generation) +{ + struct hpsb_host *host = hi->host; + struct node_entry *ne; + octlet_t guid; + struct csr1212_csr *csr; + struct nodemgr_csr_info *ci; + + ci = kmalloc(sizeof(struct nodemgr_csr_info), GFP_KERNEL); + if (!ci) + return; + + ci->host = host; + ci->nodeid = nodeid; + ci->generation = generation; + + /* 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, hi, nodeid, generation); + else + nodemgr_update_node(ne, csr, hi, nodeid, generation); + + return; +} + + +static void nodemgr_node_scan(struct host_info *hi, int generation) +{ + int count; + struct hpsb_host *host = hi->host; + 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(hi, nodeid++, generation); + } +} + + +static void nodemgr_suspend_ne(struct node_entry *ne) +{ + struct class_device *cdev; + struct unit_directory *ud; + + HPSB_DEBUG("Node suspended: ID:BUS[" NODE_BUS_FMT "] GUID[%016Lx]", + NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid); + + ne->in_limbo = 1; + device_create_file(&ne->device, &dev_attr_ne_in_limbo); + + down_write(&ne->device.bus->subsys.rwsem); + list_for_each_entry(cdev, &nodemgr_ud_class.children, node) { + ud = container_of(cdev, struct unit_directory, class_dev); + + if (ud->ne != ne) + continue; + + if (ud->device.driver && + (!ud->device.driver->suspend || + ud->device.driver->suspend(&ud->device, PMSG_SUSPEND, 0))) + device_release_driver(&ud->device); + } + up_write(&ne->device.bus->subsys.rwsem); +} + + +static void nodemgr_resume_ne(struct node_entry *ne) +{ + struct class_device *cdev; + struct unit_directory *ud; + + ne->in_limbo = 0; + device_remove_file(&ne->device, &dev_attr_ne_in_limbo); + + down_read(&ne->device.bus->subsys.rwsem); + list_for_each_entry(cdev, &nodemgr_ud_class.children, node) { + ud = container_of(cdev, struct unit_directory, class_dev); + + if (ud->ne != ne) + continue; + + if (ud->device.driver && ud->device.driver->resume) + ud->device.driver->resume(&ud->device, 0); + } + up_read(&ne->device.bus->subsys.rwsem); + + HPSB_DEBUG("Node resumed: ID:BUS[" NODE_BUS_FMT "] GUID[%016Lx]", + NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid); +} + + +static void nodemgr_update_pdrv(struct node_entry *ne) +{ + struct unit_directory *ud; + struct hpsb_protocol_driver *pdrv; + struct class *class = &nodemgr_ud_class; + struct class_device *cdev; + + down_read(&class->subsys.rwsem); + list_for_each_entry(cdev, &class->children, node) { + ud = container_of(cdev, struct unit_directory, class_dev); + if (ud->ne != ne || !ud->device.driver) + continue; + + pdrv = container_of(ud->device.driver, struct hpsb_protocol_driver, driver); + + if (pdrv->update && pdrv->update(ud)) { + down_write(&ud->device.bus->subsys.rwsem); + device_release_driver(&ud->device); + up_write(&ud->device.bus->subsys.rwsem); + } + } + up_read(&class->subsys.rwsem); +} + + +static void nodemgr_probe_ne(struct host_info *hi, struct node_entry *ne, int generation) +{ + struct device *dev; + + if (ne->host != hi->host || ne->in_limbo) + return; + + dev = get_device(&ne->device); + if (!dev) + return; + + /* 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(hi, ne); + else if (ne->generation == generation) + nodemgr_update_pdrv(ne); + else + nodemgr_suspend_ne(ne); + + put_device(dev); +} + + +static void nodemgr_node_probe(struct host_info *hi, int generation) +{ + struct hpsb_host *host = hi->host; + struct class *class = &nodemgr_ne_class; + struct class_device *cdev; + + /* 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. */ + down_read(&class->subsys.rwsem); + list_for_each_entry(cdev, &class->children, node) + nodemgr_probe_ne(hi, container_of(cdev, struct node_entry, class_dev), generation); + up_read(&class->subsys.rwsem); + + + /* If we had a bus reset while we were scanning the bus, it is + * possible that we did not probe all nodes. In that case, we + * skip the clean up for now, since we could remove nodes that + * were still on the bus. The bus reset increased hi->reset_sem, + * so there's a bus scan pending which will do the clean up + * eventually. + * + * 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 (generation == get_hpsb_generation(host)) + bus_rescan_devices(&ieee1394_bus_type); + + return; +} + +/* Because we are a 1394a-2000 compliant IRM, we need to inform all the other + * nodes of the broadcast channel. (Really we're only setting the validity + * bit). Other IRM responsibilities go in here as well. */ +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; + + host->csr.broadcast_channel |= 0x40000000; /* set validity bit */ + + bc = cpu_to_be32(host->csr.broadcast_channel); + + hpsb_write(host, LOCAL_BUS | ALL_NODES, get_hpsb_generation(host), + (CSR_REGISTER_BASE | CSR_BROADCAST_CHANNEL), + &bc, sizeof(quadlet_t)); + + /* 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; + struct node_entry *ne = find_entry_by_nodeid(host, root_node | LOCAL_BUS); + + if (ne && ne->busopt.cmc) + 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; + } + } + + 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 *__hi) +{ + struct host_info *hi = (struct host_info *)__hi; + struct hpsb_host *host = hi->host; + int reset_cycles = 0; + + /* No userlevel access needed */ + daemonize(hi->daemon_name); + + /* Setup our device-model entries */ + nodemgr_create_host_dev_files(host); + + /* Sit and wait for a signal to probe the nodes on the bus. This + * happens when we get a bus reset. */ + while (1) { + unsigned int generation = 0; + int i; + + if (down_interruptible(&hi->reset_sem) || + down_interruptible(&nodemgr_serialize)) { + if (try_to_freeze(PF_FREEZE)) + continue; + printk("NodeMgr: received unexpected signal?!\n" ); + break; + } + + if (hi->kill_me) { + up(&nodemgr_serialize); + break; + } + + /* Pause for 1/4 second in 1/16 second intervals, + * to make sure things settle down. */ + for (i = 0; i < 4 ; i++) { + set_current_state(TASK_INTERRUPTIBLE); + if (msleep_interruptible(63)) { + up(&nodemgr_serialize); + goto caught_signal; + } + + /* 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 the waiting over again */ + while (!down_trylock(&hi->reset_sem)) + i = 0; + + /* Check the kill_me again */ + if (hi->kill_me) { + up(&nodemgr_serialize); + goto caught_signal; + } + } + + if (!nodemgr_check_irm_capability(host, reset_cycles)) { + reset_cycles++; + up(&nodemgr_serialize); + continue; + } + + /* Scan our nodes to get the bus options and create node + * entries. This does not do the sysfs stuff, since that + * would trigger hotplug callbacks and such, which is a + * bad idea at this point. */ + nodemgr_node_scan(hi, generation); + if (!nodemgr_do_irm_duties(host, reset_cycles)) { + reset_cycles++; + up(&nodemgr_serialize); + continue; + } + + reset_cycles = 0; + + /* This actually does the full probe, with sysfs + * registration. */ + nodemgr_node_probe(hi, generation); + + /* Update some of our sysfs symlinks */ + nodemgr_update_host_dev_links(host); + + up(&nodemgr_serialize); + } + +caught_signal: + HPSB_VERBOSE("NodeMgr: Exiting thread"); + + complete_and_exit(&hi->exited, 0); +} + +int nodemgr_for_each_host(void *__data, int (*cb)(struct hpsb_host *, void *)) +{ + struct class *class = &hpsb_host_class; + struct class_device *cdev; + struct hpsb_host *host; + int error = 0; + + down_read(&class->subsys.rwsem); + list_for_each_entry(cdev, &class->children, node) { + host = container_of(cdev, struct hpsb_host, class_dev); + + if ((error = cb(host, __data))) + break; + } + up_read(&class->subsys.rwsem); + + return error; +} + +/* The following four 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. + */ + +void hpsb_node_fill_packet(struct node_entry *ne, struct hpsb_packet *pkt) +{ + pkt->host = ne->host; + pkt->generation = ne->generation; + barrier(); + pkt->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; + init_completion(&hi->exited); + sema_init(&hi->reset_sem, 0); + + sprintf(hi->daemon_name, "knodemgrd_%d", host->id); + + hi->pid = kernel_thread(nodemgr_host_thread, hi, CLONE_KERNEL); + + if (hi->pid < 0) { + HPSB_ERR ("NodeMgr: failed to start %s thread for %s", + hi->daemon_name, host->driver->name); + hpsb_destroy_hostinfo(&nodemgr_highlevel, host); + return; + } + + return; +} + +static void nodemgr_host_reset(struct hpsb_host *host) +{ + struct host_info *hi = hpsb_get_hostinfo(&nodemgr_highlevel, host); + + if (hi != NULL) { + HPSB_VERBOSE("NodeMgr: Processing host reset for %s", hi->daemon_name); + up(&hi->reset_sem); + } else + HPSB_ERR ("NodeMgr: could not process reset of unused host"); + + return; +} + +static void nodemgr_remove_host(struct hpsb_host *host) +{ + struct host_info *hi = hpsb_get_hostinfo(&nodemgr_highlevel, host); + + if (hi) { + if (hi->pid >= 0) { + hi->kill_me = 1; + mb(); + up(&hi->reset_sem); + wait_for_completion(&hi->exited); + nodemgr_remove_host_dev(&host->device); + } + } else + HPSB_ERR("NodeMgr: host %s does not exist, cannot remove", + host->driver->name); + + return; +} + +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 ret; + + ret = class_register(&nodemgr_ne_class); + if (ret < 0) + return ret; + + ret = class_register(&nodemgr_ud_class); + if (ret < 0) { + class_unregister(&nodemgr_ne_class); + return ret; + } + + hpsb_register_highlevel(&nodemgr_highlevel); + + return 0; +} + +void cleanup_ieee1394_nodemgr(void) +{ + hpsb_unregister_highlevel(&nodemgr_highlevel); + + class_unregister(&nodemgr_ud_class); + class_unregister(&nodemgr_ne_class); +} |