/*
* RapidIO enumeration and discovery support
*
* Copyright 2005 MontaVista Software, Inc.
* Matt Porter <mporter@kernel.crashing.org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/init.h>
#include <linux/rio.h>
#include <linux/rio_drv.h>
#include <linux/rio_ids.h>
#include <linux/rio_regs.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/timer.h>
#include <linux/jiffies.h>
#include <linux/slab.h>
#include "rio.h"
LIST_HEAD(rio_devices);
static LIST_HEAD(rio_switches);
#define RIO_ENUM_CMPL_MAGIC 0xdeadbeef
static void rio_enum_timeout(unsigned long);
DEFINE_SPINLOCK(rio_global_list_lock);
static int next_destid = 0;
static int next_switchid = 0;
static int next_net = 0;
static struct timer_list rio_enum_timer =
TIMER_INITIALIZER(rio_enum_timeout, 0, 0);
static int rio_mport_phys_table[] = {
RIO_EFB_PAR_EP_ID,
RIO_EFB_PAR_EP_REC_ID,
RIO_EFB_SER_EP_ID,
RIO_EFB_SER_EP_REC_ID,
-1,
};
static int rio_sport_phys_table[] = {
RIO_EFB_PAR_EP_FREE_ID,
RIO_EFB_SER_EP_FREE_ID,
-1,
};
/**
* rio_get_device_id - Get the base/extended device id for a device
* @port: RIO master port
* @destid: Destination ID of device
* @hopcount: Hopcount to device
*
* Reads the base/extended device id from a device. Returns the
* 8/16-bit device ID.
*/
static u16 rio_get_device_id(struct rio_mport *port, u16 destid, u8 hopcount)
{
u32 result;
rio_mport_read_config_32(port, destid, hopcount, RIO_DID_CSR, &result);
return RIO_GET_DID(result);
}
/**
* rio_set_device_id - Set the base/extended device id for a device
* @port: RIO master port
* @destid: Destination ID of device
* @hopcount: Hopcount to device
* @did: Device ID value to be written
*
* Writes the base/extended device id from a device.
*/
static void rio_set_device_id(struct rio_mport *port, u16 destid, u8 hopcount, u16 did)
{
rio_mport_write_config_32(port, destid, hopcount, RIO_DID_CSR,
RIO_SET_DID(did));
}
/**
* rio_local_set_device_id - Set the base/extended device id for a port
* @port: RIO master port
* @did: Device ID value to be written
*
* Writes the base/extended device id from a device.
*/
static void rio_local_set_device_id(struct rio_mport *port, u16 did)
{
rio_local_write_config_32(port, RIO_DID_CSR, RIO_SET_DID(did));
}
/**
* rio_clear_locks- Release all host locks and signal enumeration complete
* @port: Master port to issue transaction
*
* Marks the component tag CSR on each device with the enumeration
* complete flag. When complete, it then release the host locks on
* each device. Returns 0 on success or %-EINVAL on failure.
*/
static int rio_clear_locks(struct rio_mport *port)
{
struct rio_dev *rdev;
u32 result;
int ret = 0;
/* Write component tag CSR magic complete value */
rio_local_write_config_32(port, RIO_COMPONENT_TAG_CSR,
RIO_ENUM_CMPL_MAGIC);
list_for_each_entry(rdev, &rio_devices, global_list)
rio_write_config_32(rdev, RIO_COMPONENT_TAG_CSR,
RIO_ENUM_CMPL_MAGIC);
/* Release host device id locks */
rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
port->host_deviceid);
rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
if ((result & 0xffff) != 0xffff) {
printk(KERN_INFO
"RIO: badness when releasing host lock on master port, result %8.8x\n",
result);
ret = -EINVAL;
}
list_for_each_entry(rdev, &rio_devices, global_list) {
rio_write_config_32(rdev, RIO_HOST_DID_LOCK_CSR,
port->host_deviceid);
rio_read_config_32(rdev, RIO_HOST_DID_LOCK_CSR, &result);
if ((result & 0xffff) != 0xffff) {
printk(KERN_INFO
"RIO: badness when releasing host lock on vid %4.4x did %4.4x\n",
rdev->vid, rdev->did);
ret = -EINVAL;
}
}
return ret;
}
/**
* rio_enum_host- Set host lock and initialize host destination ID
* @port: Master port to issue transaction
*
* Sets the local host master port lock and destination ID register
* with the host device ID value. The host device ID value is provided
* by the platform. Returns %0 on success or %-1 on failure.
*/
static int rio_enum_host(struct rio_mport *port)
{
u32 result;
/* Set master port host device id lock */
rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
port->host_deviceid);
rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
if ((result & 0xffff) != port->host_deviceid)
return -1;
/* Set master port destid and init destid ctr */
rio_local_set_device_id(port, port->host_deviceid);
if (next_destid == port->host_deviceid)
next_destid++;
return 0;
}
/**
* rio_device_has_destid- Test if a device contains a destination ID register
* @port: Master port to issue transaction
* @src_ops: RIO device source operations
* @dst_ops: RIO device destination operations
*
* Checks the provided @src_ops and @dst_ops for the necessary transaction
* capabilities that indicate whether or not a device will implement a
* destination ID register. Returns 1 if true or 0 if false.
*/
static int rio_device_has_destid(struct rio_mport *port, int src_ops,
int dst_ops)
{
u32 mask = RIO_OPS_READ | RIO_OPS_WRITE | RIO_OPS_ATOMIC_TST_SWP | RIO_OPS_ATOMIC_INC | RIO_OPS_ATOMIC_DEC | RIO_OPS_ATOMIC_SET | RIO_OPS_ATOMIC_CLR;
return !!((src_ops | dst_ops) & mask);
}
/**
* rio_release_dev- Frees a RIO device struct
* @dev: LDM device associated with a RIO device struct
*
* Gets the RIO device struct associated a RIO device struct.
* The RIO device struct is freed.
*/
static void rio_release_dev(struct device *dev)
{
struct rio_dev *rdev;
rdev = to_rio_dev(dev);
kfree(rdev);
}
/**
* rio_is_switch- Tests if a RIO device has switch capabilities
* @rdev: RIO device
*
* Gets the RIO device Processing Element Features register
* contents and tests for switch capabilities. Returns 1 if
* the device is a switch or 0 if it is not a switch.
* The RIO device struct is freed.
*/
static int rio_is_switch(struct rio_dev *rdev)
{
if (rdev->pef & RIO_PEF_SWITCH)
return 1;
return 0;
}
/**
* rio_route_set_ops- Sets routing operations for a particular vendor switch
* @rdev: RIO device
*
* Searches the RIO route ops table for known switch types. If the vid
* and did match a switch table entry, then set the add_entry() and
* get_entry() ops to the table entry values.
*/
static void rio_route_set_ops(struct rio_dev *rdev)
{
struct rio_route_ops *cur = __start_rio_route_ops;
struct rio_route_ops *end = __end_rio_route_ops;
while (cur < end) {
if ((cur->vid == rdev->vid) && (cur->did == rdev->did)) {
pr_debug("RIO: adding routing ops for %s\n", rio_name(rdev));
rdev->rswitch->add_entry = cur->add_hook;
rdev->rswitch->get_entry = cur->get_hook;
}
cur++;
}
if (!rdev->rswitch->add_entry || !rdev->rswitch->get_entry)
printk(KERN_ERR "RIO: missing routing ops for %s\n",
rio_name(rdev));
}
/**
* rio_add_device- Adds a RIO device to the device model
* @rdev: RIO device
*
* Adds the RIO device to the global device list and adds the RIO
* device to the RIO device list. Creates the generic sysfs nodes
* for an RIO device.
*/
static void __devinit rio_add_device(struct rio_dev *rdev)
{
device_add(&rdev->dev);
spin_lock(&rio_global_list_lock);
list_add_tail(&rdev->global_list, &rio_devices);
spin_unlock(&rio_global_list_lock);
rio_create_sysfs_dev_files(rdev);
}
/**
* rio_setup_device- Allocates and sets up a RIO device
* @net: RIO network
* @port: Master port to send transactions
* @destid: Current destination ID
* @hopcount: Current hopcount
* @do_enum: Enumeration/Discovery mode flag
*
* Allocates a RIO device and configures fields based on configuration
* space contents. If device has a destination ID register, a destination
* ID is either assigned in enumeration mode or read from configuration
* space in discovery mode. If the device has switch capabilities, then
* a switch is allocated and configured appropriately. Returns a pointer
* to a RIO device on success or NULL on failure.
*
*/
static struct rio_dev *rio_setup_device(struct rio_net *net,
struct rio_mport *port, u16 destid,
u8 hopcount, int do_enum)
{
struct rio_dev *rdev;
struct rio_switch *rswitch;
int result, rdid;
rdev = kzalloc(sizeof(struct rio_dev), GFP_KERNEL);
if (!rdev)
goto out;
rdev->net = net;
rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_ID_CAR,
&result);
rdev->did = result >> 16;
rdev->vid = result & 0xffff;
rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_INFO_CAR,
&rdev->device_rev);
rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_ID_CAR,
&result);
rdev->asm_did = result >> 16;
rdev->asm_vid = result & 0xffff;
rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_INFO_CAR,
&result);
rdev->asm_rev = result >> 16;
rio_mport_read_config_32(port, destid, hopcount, RIO_PEF_CAR,
&rdev->pef);
if (rdev->pef & RIO_PEF_EXT_FEATURES)
rdev->efptr = result & 0xffff;
rio_mport_read_config_32(port, destid, hopcount, RIO_SRC_OPS_CAR,
&rdev->src_ops);
rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR,
&rdev->dst_ops);
if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) {
if (do_enum) {
rio_set_device_id(port, destid, hopcount, next_destid);
rdev->destid = next_destid++;
if (next_destid == port->host_deviceid)
next_destid++;
} else
rdev->destid = rio_get_device_id(port, destid, hopcount);
} else
/* Switch device has an associated destID */
rdev->destid = RIO_INVALID_DESTID;
/* If a PE has both switch and other functions, show it as a switch */
if (rio_is_switch(rdev)) {
rio_mport_read_config_32(port, destid, hopcount,
RIO_SWP_INFO_CAR, &rdev->swpinfo);
rswitch = kmalloc(sizeof(struct rio_switch), GFP_KERNEL);
if (!rswitch) {
kfree(rdev);
rdev = NULL;
goto out;
}
rswitch->switchid = next_switchid;
rswitch->hopcount = hopcount;
rswitch->destid = destid;
/* Initialize switch route table */
for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES; rdid++)
rswitch->route_table[rdid] = RIO_INVALID_ROUTE;
rdev->rswitch = rswitch;
sprintf(rio_name(rdev), "%02x:s:%04x", rdev->net->id,
rdev->rswitch->switchid);
rio_route_set_ops(rdev);
list_add_tail(&rswitch->node, &rio_switches);
} else
sprintf(rio_name(rdev), "%02x:e:%04x", rdev->net->id,
rdev->destid);
rdev->dev.bus = &rio_bus_type;
device_initialize(&rdev->dev);
rdev->dev.release = rio_release_dev;
rio_dev_get(rdev);
rdev->dma_mask = DMA_32BIT_MASK;
rdev->dev.dma_mask = &rdev->dma_mask;
rdev->dev.coherent_dma_mask = DMA_32BIT_MASK;
if ((rdev->pef & RIO_PEF_INB_DOORBELL) &&
(rdev->dst_ops & RIO_DST_OPS_DOORBELL))
rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
0, 0xffff);
rio_add_device(rdev);
out:
return rdev;
}
/**
* rio_sport_is_active- Tests if a switch port has an active connection.
* @port: Master port to send transaction
* @destid: Associated destination ID for switch
* @hopcount: Hopcount to reach switch
* @sport: Switch port number
*
* Reads the port error status CSR for a particular switch port to
* determine if the port has an active link. Returns
* %PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is
* inactive.
*/
static int
rio_sport_is_active(struct rio_mport *port, u16 destid, u8 hopcount, int sport)
{
u32 result;
u32 ext_ftr_ptr;
int *entry = rio_sport_phys_table;
do {
if ((ext_ftr_ptr =
rio_mport_get_feature(port, 0, destid, hopcount, *entry)))
break;
} while (*++entry >= 0);
if (ext_ftr_ptr)
rio_mport_read_config_32(port, destid, hopcount,
ext_ftr_ptr +
RIO_PORT_N_ERR_STS_CSR(sport),
&result);
return (result & PORT_N_ERR_STS_PORT_OK);
}
/**
* rio_route_add_entry- Add a route entry to a switch routing table
* @mport: Master port to send transaction
* @rswitch: Switch device
* @table: Routing table ID
* @route_destid: Destination ID to be routed
* @route_port: Port number to be routed
*
* Calls the switch specific add_entry() method to add a route entry
* on a switch. The route table can be specified using the @table
* argument if a switch has per port routing tables or the normal
* use is to specific all tables (or the global table) by passing
* %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
* on failure.
*/
static int rio_route_add_entry(struct rio_mport *mport, struct rio_switch *rswitch,
u16 table, u16 route_destid, u8 route_port)
{
return rswitch->add_entry(mport, rswitch->destid,
rswitch->hopcount, table,
route_destid, route_port);
}
/**
* rio_route_get_entry- Read a route entry in a switch routing table
* @mport: Master port to send transaction
* @rswitch: Switch device
* @table: Routing table ID
* @route_destid: Destination ID to be routed
* @route_port: Pointer to read port number into
*
* Calls the switch specific get_entry() method to read a route entry
* in a switch. The route table can be specified using the @table
* argument if a switch has per port routing tables or the normal
* use is to specific all tables (or the global table) by passing
* %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
* on failure.
*/
static int
rio_route_get_entry(struct rio_mport *mport, struct rio_switch *rswitch, u16 table,
u16 route_destid, u8 * route_port)
{
return rswitch->get_entry(mport, rswitch->destid,
rswitch->hopcount, table,
route_destid, route_port);
}
/**
* rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device
* @port: Master port to send transaction
* @hopcount: Number of hops to the device
*
* Used during enumeration to read the Host Device ID Lock CSR on a
* RIO device. Returns the value of the lock register.
*/
static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount)
{
u32 result;
rio_mport_read_config_32(port, RIO_ANY_DESTID, hopcount,
RIO_HOST_DID_LOCK_CSR, &result);
return (u16) (result & 0xffff);
}
/**
* rio_get_swpinfo_inport- Gets the ingress port number
* @mport: Master port to send transaction
* @destid: Destination ID associated with the switch
* @hopcount: Number of hops to the device
*
* Returns port number being used to access the switch device.
*/
static u8
rio_get_swpinfo_inport(struct rio_mport *mport, u16 destid, u8 hopcount)
{
u32 result;
rio_mport_read_config_32(mport, destid, hopcount, RIO_SWP_INFO_CAR,
&result);
return (u8) (result & 0xff);
}
/**
* rio_get_swpinfo_tports- Gets total number of ports on the switch
* @mport: Master port to send transaction
* @destid: Destination ID associated with the switch
* @hopcount: Number of hops to the device
*
* Returns total numbers of ports implemented by the switch device.
*/
static u8 rio_get_swpinfo_tports(struct rio_mport *mport, u16 destid,
u8 hopcount)
{
u32 result;
rio_mport_read_config_32(mport, destid, hopcount, RIO_SWP_INFO_CAR,
&result);
return RIO_GET_TOTAL_PORTS(result);
}
/**
* rio_net_add_mport- Add a master port to a RIO network
* @net: RIO network
* @port: Master port to add
*
* Adds a master port to the network list of associated master
* ports..
*/
static void rio_net_add_mport(struct rio_net *net, struct rio_mport *port)
{
spin_lock(&rio_global_list_lock);
list_add_tail(&port->nnode, &net->mports);
spin_unlock(&rio_global_list_lock);
}
/**
* rio_enum_peer- Recursively enumerate a RIO network through a master port
* @net: RIO network being enumerated
* @port: Master port to send transactions
* @hopcount: Number of hops into the network
*
* Recursively enumerates a RIO network. Transactions are sent via the
* master port passed in @port.
*/
static int rio_enum_peer(struct rio_net *net, struct rio_mport *port,
u8 hopcount)
{
int port_num;
int num_ports;
int cur_destid;
int sw_destid;
int sw_inport;
struct rio_dev *rdev;
u16 destid;
int tmp;
if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) {
pr_debug("RIO: PE already discovered by this host\n");
/*
* Already discovered by this host. Add it as another
* master port for the current network.
*/
rio_net_add_mport(net, port);
return 0;
}
/* Attempt to acquire device lock */
rio_mport_write_config_32(port, RIO_ANY_DESTID, hopcount,
RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
while ((tmp = rio_get_host_deviceid_lock(port, hopcount))
< port->host_deviceid) {
/* Delay a bit */
mdelay(1);
/* Attempt to acquire device lock again */
rio_mport_write_config_32(port, RIO_ANY_DESTID, hopcount,
RIO_HOST_DID_LOCK_CSR,
port->host_deviceid);
}
if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) {
pr_debug(
"RIO: PE locked by a higher priority host...retreating\n");
return -1;
}
/* Setup new RIO device */
if ((rdev = rio_setup_device(net, port, RIO_ANY_DESTID, hopcount, 1))) {
/* Add device to the global and bus/net specific list. */
list_add_tail(&rdev->net_list, &net->devices);
} else
return -1;
if (rio_is_switch(rdev)) {
next_switchid++;
sw_inport = rio_get_swpinfo_inport(port, RIO_ANY_DESTID, hopcount);
rio_route_add_entry(port, rdev->rswitch, RIO_GLOBAL_TABLE,
port->host_deviceid, sw_inport);
rdev->rswitch->route_table[port->host_deviceid] = sw_inport;
for (destid = 0; destid < next_destid; destid++) {
if (destid == port->host_deviceid)
continue;
rio_route_add_entry(port, rdev->rswitch, RIO_GLOBAL_TABLE,
destid, sw_inport);
rdev->rswitch->route_table[destid] = sw_inport;
}
num_ports =
rio_get_swpinfo_tports(port, RIO_ANY_DESTID, hopcount);
pr_debug(
"RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
rio_name(rdev), rdev->vid, rdev->did, num_ports);
sw_destid = next_destid;
for (port_num = 0; port_num < num_ports; port_num++) {
if (sw_inport == port_num)
continue;
cur_destid = next_destid;
if (rio_sport_is_active
(port, RIO_ANY_DESTID, hopcount, port_num)) {
pr_debug(
"RIO: scanning device on port %d\n",
port_num);
rio_route_add_entry(port, rdev->rswitch,
RIO_GLOBAL_TABLE,
RIO_ANY_DESTID, port_num);
if (rio_enum_peer(net, port, hopcount + 1) < 0)
return -1;
/* Update routing tables */
if (next_destid > cur_destid) {
for (destid = cur_destid;
destid < next_destid; destid++) {
if (destid == port->host_deviceid)
continue;
rio_route_add_entry(port, rdev->rswitch,
RIO_GLOBAL_TABLE,
destid,
port_num);
rdev->rswitch->
route_table[destid] =
port_num;
}
}
}
}
/* Check for empty switch */
if (next_destid == sw_destid) {
next_destid++;
if (next_destid == port->host_deviceid)
next_destid++;
}
rdev->rswitch->destid = sw_destid;
} else
pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
rio_name(rdev), rdev->vid, rdev->did);
return 0;
}
/**
* rio_enum_complete- Tests if enumeration of a network is complete
* @port: Master port to send transaction
*
* Tests the Component Tag CSR for presence of the magic enumeration
* complete flag. Return %1 if enumeration is complete or %0 if
* enumeration is incomplete.
*/
static int rio_enum_complete(struct rio_mport *port)
{
u32 tag_csr;
int ret = 0;
rio_local_read_config_32(port, RIO_COMPONENT_TAG_CSR, &tag_csr);
if (tag_csr == RIO_ENUM_CMPL_MAGIC)
ret = 1;
return ret;
}
/**
* rio_disc_peer- Recursively discovers a RIO network through a master port
* @net: RIO network being discovered
* @port: Master port to send transactions
* @destid: Current destination ID in network
* @hopcount: Number of hops into the network
*
* Recursively discovers a RIO network. Transactions are sent via the
* master port passed in @port.
*/
static int
rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid,
u8 hopcount)
{
u8 port_num, route_port;
int num_ports;
struct rio_dev *rdev;
u16 ndestid;
/* Setup new RIO device */
if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) {
/* Add device to the global and bus/net specific list. */
list_add_tail(&rdev->net_list, &net->devices);
} else
return -1;
if (rio_is_switch(rdev)) {
next_switchid++;
/* Associated destid is how we accessed this switch */
rdev->rswitch->destid = destid;
num_ports = rio_get_swpinfo_tports(port, destid, hopcount);
pr_debug(
"RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
rio_name(rdev), rdev->vid, rdev->did, num_ports);
for (port_num = 0; port_num < num_ports; port_num++) {
if (rio_get_swpinfo_inport(port, destid, hopcount) ==
port_num)
continue;
if (rio_sport_is_active
(port, destid, hopcount, port_num)) {
pr_debug(
"RIO: scanning device on port %d\n",
port_num);
for (ndestid = 0; ndestid < RIO_ANY_DESTID;
ndestid++) {
rio_route_get_entry(port, rdev->rswitch,
RIO_GLOBAL_TABLE,
ndestid,
&route_port);
if (route_port == port_num)
break;
}
if (rio_disc_peer
(net, port, ndestid, hopcount + 1) < 0)
return -1;
}
}
} else
pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
rio_name(rdev), rdev->vid, rdev->did);
return 0;
}
/**
* rio_mport_is_active- Tests if master port link is active
* @port: Master port to test
*
* Reads the port error status CSR for the master port to
* determine if the port has an active link. Returns
* %PORT_N_ERR_STS_PORT_OK if the master port is active
* or %0 if it is inactive.
*/
static int rio_mport_is_active(struct rio_mport *port)
{
u32 result = 0;
u32 ext_ftr_ptr;
int *entry = rio_mport_phys_table;
do {
if ((ext_ftr_ptr =
rio_mport_get_feature(port, 1, 0, 0, *entry)))
break;
} while (*++entry >= 0);
if (ext_ftr_ptr)
rio_local_read_config_32(port,
ext_ftr_ptr +
RIO_PORT_N_ERR_STS_CSR(port->index),
&result);
return (result & PORT_N_ERR_STS_PORT_OK);
}
/**
* rio_alloc_net- Allocate and configure a new RIO network
* @port: Master port associated with the RIO network
*
* Allocates a RIO network structure, initializes per-network
* list heads, and adds the associated master port to the
* network list of associated master ports. Returns a
* RIO network pointer on success or %NULL on failure.
*/
static struct rio_net __devinit *rio_alloc_net(struct rio_mport *port)
{
struct rio_net *net;
net = kzalloc(sizeof(struct rio_net), GFP_KERNEL);
if (net) {
INIT_LIST_HEAD(&net->node);
INIT_LIST_HEAD(&net->devices);
INIT_LIST_HEAD(&net->mports);
list_add_tail(&port->nnode, &net->mports);
net->hport = port;
net->id = next_net++;
}
return net;
}
/**
* rio_update_route_tables- Updates route tables in switches
* @port: Master port associated with the RIO network
*
* For each enumerated device, ensure that each switch in a system
* has correct routing entries. Add routes for devices that where
* unknown dirung the first enumeration pass through the switch.
*/
static void rio_update_route_tables(struct rio_mport *port)
{
struct rio_dev *rdev;
struct rio_switch *rswitch;
u8 sport;
u16 destid;
list_for_each_entry(rdev, &rio_devices, global_list) {
destid = (rio_is_switch(rdev))?rdev->rswitch->destid:rdev->destid;
list_for_each_entry(rswitch, &rio_switches, node) {
if (rio_is_switch(rdev) && (rdev->rswitch == rswitch))
continue;
if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) {
sport = rio_get_swpinfo_inport(port,
rswitch->destid, rswitch->hopcount);
if (rswitch->add_entry) {
rio_route_add_entry(port, rswitch, RIO_GLOBAL_TABLE, destid, sport);
rswitch->route_table[destid] = sport;
}
}
}
}
}
/**
* rio_enum_mport- Start enumeration through a master port
* @mport: Master port to send transactions
*
* Starts the enumeration process. If somebody has enumerated our
* master port device, then give up. If not and we have an active
* link, then start recursive peer enumeration. Returns %0 if
* enumeration succeeds or %-EBUSY if enumeration fails.
*/
int rio_enum_mport(struct rio_mport *mport)
{
struct rio_net *net = NULL;
int rc = 0;
printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id,
mport->name);
/* If somebody else enumerated our master port device, bail. */
if (rio_enum_host(mport) < 0) {
printk(KERN_INFO
"RIO: master port %d device has been enumerated by a remote host\n",
mport->id);
rc = -EBUSY;
goto out;
}
/* If master port has an active link, allocate net and enum peers */
if (rio_mport_is_active(mport)) {
if (!(net = rio_alloc_net(mport))) {
printk(KERN_ERR "RIO: failed to allocate new net\n");
rc = -ENOMEM;
goto out;
}
if (rio_enum_peer(net, mport, 0) < 0) {
/* A higher priority host won enumeration, bail. */
printk(KERN_INFO
"RIO: master port %d device has lost enumeration to a remote host\n",
mport->id);
rio_clear_locks(mport);
rc = -EBUSY;
goto out;
}
rio_update_route_tables(mport);
rio_clear_locks(mport);
} else {
printk(KERN_INFO "RIO: master port %d link inactive\n",
mport->id);
rc = -EINVAL;
}
out:
return rc;
}
/**
* rio_build_route_tables- Generate route tables from switch route entries
*
* For each switch device, generate a route table by copying existing
* route entries from the switch.
*/
static void rio_build_route_tables(void)
{
struct rio_dev *rdev;
int i;
u8 sport;
list_for_each_entry(rdev, &rio_devices, global_list)
if (rio_is_switch(rdev))
for (i = 0; i < RIO_MAX_ROUTE_ENTRIES; i++) {
if (rio_route_get_entry
(rdev->net->hport, rdev->rswitch, RIO_GLOBAL_TABLE,
i, &sport) < 0)
continue;
rdev->rswitch->route_table[i] = sport;
}
}
/**
* rio_enum_timeout- Signal that enumeration timed out
* @data: Address of timeout flag.
*
* When the enumeration complete timer expires, set a flag that
* signals to the discovery process that enumeration did not
* complete in a sane amount of time.
*/
static void rio_enum_timeout(unsigned long data)
{
/* Enumeration timed out, set flag */
*(int *)data = 1;
}
/**
* rio_disc_mport- Start discovery through a master port
* @mport: Master port to send transactions
*
* Starts the discovery process. If we have an active link,
* then wait for the signal that enumeration is complete.
* When enumeration completion is signaled, start recursive
* peer discovery. Returns %0 if discovery succeeds or %-EBUSY
* on failure.
*/
int rio_disc_mport(struct rio_mport *mport)
{
struct rio_net *net = NULL;
int enum_timeout_flag = 0;
printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id,
mport->name);
/* If master port has an active link, allocate net and discover peers */
if (rio_mport_is_active(mport)) {
if (!(net = rio_alloc_net(mport))) {
printk(KERN_ERR "RIO: Failed to allocate new net\n");
goto bail;
}
pr_debug("RIO: wait for enumeration complete...");
rio_enum_timer.expires =
jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ;
rio_enum_timer.data = (unsigned long)&enum_timeout_flag;
add_timer(&rio_enum_timer);
while (!rio_enum_complete(mport)) {
mdelay(1);
if (enum_timeout_flag) {
del_timer_sync(&rio_enum_timer);
goto timeout;
}
}
del_timer_sync(&rio_enum_timer);
pr_debug("done\n");
if (rio_disc_peer(net, mport, RIO_ANY_DESTID, 0) < 0) {
printk(KERN_INFO
"RIO: master port %d device has failed discovery\n",
mport->id);
goto bail;
}
rio_build_route_tables();
}
return 0;
timeout:
pr_debug("timeout\n");
bail:
return -EBUSY;
}
