diff options
Diffstat (limited to 'drivers/ieee1394/nodemgr.c')
| -rw-r--r-- | drivers/ieee1394/nodemgr.c | 1901 |
1 files changed, 0 insertions, 1901 deletions
diff --git a/drivers/ieee1394/nodemgr.c b/drivers/ieee1394/nodemgr.c deleted file mode 100644 index 18350213479..00000000000 --- a/drivers/ieee1394/nodemgr.c +++ /dev/null @@ -1,1901 +0,0 @@ -/* - * 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/kmemcheck.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 <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; - - kmemcheck_bitfield_begin(flags); - unsigned int speed_unverified:1; - kmemcheck_bitfield_end(flags); -}; - - -/* - * 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, 4); - 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, - 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, 4); - 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) { - error = nodemgr_check_speed(ci, addr, buffer); - if (!error) - break; - } - if (msleep_interruptible(334)) - return -EINTR; - } - return error; -} - -static struct csr1212_bus_ops nodemgr_csr_ops = { - .bus_read = nodemgr_bus_read, -}; - - -/* - * 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; - const 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; - const 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)++; - - /* inherit vendor_id from root directory if none exists in unit dir */ - ud->vendor_id = ne->vendor_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); - } - - /* Finally, mark the node current */ - smp_wmb(); - 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); - kmemcheck_annotate_bitfield(ci, flags); - 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) { - device_lock(&ud->device); - error = pdrv->update(ud); - device_unlock(&ud->device); - } - 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; - smp_rmb(); - 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; - - smp_rmb(); - 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); -} |