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linux/drivers/ieee1394/nodemgr.c
Ben Collins 1934b8b656 [PATCH] Sync up ieee-1394 
Lots of this patch is trivial code cleanups (static vars were being
intialized to 0, etc).

There's also some fixes for ISO transmits (max buffer handling).
Aswell, we have a few fixes to disable IRM capabilites correctly.  We've
also disabled, by default some generally unused EXPORT symbols for the
sake of cleanliness in the kernel.  However, instead of removing them
completely, we felt it necessary to have a config option that allowed
them to be enabled for the many projects outside of the main kernel tree
that use our API for driver development.

The primary reason for this patch is to revert a MODE6->MODE10 RBC
conversion patch from the SCSI maintainers.  The new conversions handled
directly in the scsi layer do not seem to work for SBP2.  This patch
reverts to our old working code so that users can enjoy using Firewire
disks and dvd drives again.

We are working with the SCSI maintainers to resolve this issue outside
of the main kernel tree.  We'll merge the patch once the SCSI layer's
handling of the MODE10 conversion is working for us.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-07-10 12:23:23 -07:00

1733 lines
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/*
* 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;
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, 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);
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);
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, struct device_attribute *attr, 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, struct device_attribute *attr, 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, 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) {
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, 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_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 int __nodemgr_remove_host_dev(struct device *dev, void *data)
{
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, __nodemgr_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 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:
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())
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);
}
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