From af84ca38aff94061dd0711edbb99b0900a9c28fd Mon Sep 17 00:00:00 2001 From: Alexandre Bounine Date: Wed, 27 Oct 2010 15:34:34 -0700 Subject: rapidio: add handling of redundant routes Detects RIO link to the already enumerated device and properly sets links between device objects. Changes to the enumeration/discovery logic: 1. Use Master Enable bit to signal end of the enumeration - agents may start their discovery process as soon as they see this bit set (Component Tag register was used before for this purpose). 2. Enumerator sets Component Tag (!= 0) immediately during device setup. This allows to identify the device if the redundant route exists in a RIO system. Signed-off-by: Alexandre Bounine Cc: Thomas Moll Cc: Matt Porter Cc: Li Yang Cc: Kumar Gala Cc: Micha Nelissen Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/rapidio/rio-scan.c | 88 ++++++++++++++++++++++++---------------------- drivers/rapidio/rio.c | 16 ++++----- drivers/rapidio/rio.h | 1 + 3 files changed, 54 insertions(+), 51 deletions(-) (limited to 'drivers') diff --git a/drivers/rapidio/rio-scan.c b/drivers/rapidio/rio-scan.c index e3efdf93df5a..1eb82c4c712e 100644 --- a/drivers/rapidio/rio-scan.c +++ b/drivers/rapidio/rio-scan.c @@ -48,7 +48,7 @@ DEFINE_SPINLOCK(rio_global_list_lock); static int next_destid = 0; static int next_switchid = 0; static int next_net = 0; -static int next_comptag; +static int next_comptag = 1; static struct timer_list rio_enum_timer = TIMER_INITIALIZER(rio_enum_timeout, 0, 0); @@ -121,27 +121,6 @@ static int rio_clear_locks(struct rio_mport *port) u32 result; int ret = 0; - /* Assign component tag to all devices */ - next_comptag = 1; - rio_local_write_config_32(port, RIO_COMPONENT_TAG_CSR, next_comptag++); - - list_for_each_entry(rdev, &rio_devices, global_list) { - /* Mark device as discovered */ - rio_read_config_32(rdev, - rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR, - &result); - rio_write_config_32(rdev, - rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR, - result | RIO_PORT_GEN_DISCOVERED); - - rio_write_config_32(rdev, RIO_COMPONENT_TAG_CSR, next_comptag); - rdev->comp_tag = next_comptag++; - if (next_comptag >= 0x10000) { - pr_err("RIO: Component Tag Counter Overflow\n"); - break; - } - } - /* Release host device id locks */ rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR, port->host_deviceid); @@ -162,6 +141,15 @@ static int rio_clear_locks(struct rio_mport *port) rdev->vid, rdev->did); ret = -EINVAL; } + + /* Mark device as discovered and enable master */ + rio_read_config_32(rdev, + rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR, + &result); + result |= RIO_PORT_GEN_DISCOVERED | RIO_PORT_GEN_MASTER; + rio_write_config_32(rdev, + rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR, + result); } return ret; @@ -430,6 +418,17 @@ static struct rio_dev __devinit *rio_setup_device(struct rio_net *net, rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR, &rdev->dst_ops); + if (do_enum) { + /* Assign component tag to device */ + if (next_comptag >= 0x10000) { + pr_err("RIO: Component Tag Counter Overflow\n"); + goto cleanup; + } + rio_mport_write_config_32(port, destid, hopcount, + RIO_COMPONENT_TAG_CSR, next_comptag); + rdev->comp_tag = next_comptag++; + } + if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) { if (do_enum) { rio_set_device_id(port, destid, hopcount, next_destid); @@ -725,21 +724,6 @@ static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount) return (u16) (result & 0xffff); } -/** - * 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 @@ -760,6 +744,7 @@ static int __devinit rio_enum_peer(struct rio_net *net, struct rio_mport *port, int sw_inport; struct rio_dev *rdev; u16 destid; + u32 regval; int tmp; if (rio_mport_chk_dev_access(port, @@ -772,9 +757,21 @@ static int __devinit rio_enum_peer(struct rio_net *net, struct rio_mport *port, 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. + * link to the existing device. */ - rio_net_add_mport(net, port); + rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), + hopcount, RIO_COMPONENT_TAG_CSR, ®val); + + if (regval) { + rdev = rio_get_comptag((regval & 0xffff), NULL); + + if (rdev && prev && rio_is_switch(prev)) { + pr_debug("RIO: redundant path to %s\n", + rio_name(rdev)); + prev->rswitch->nextdev[prev_port] = rdev; + } + } + return 0; } @@ -925,10 +922,11 @@ static int __devinit rio_enum_peer(struct rio_net *net, struct rio_mport *port, */ static int rio_enum_complete(struct rio_mport *port) { - u32 tag_csr; + u32 regval; - rio_local_read_config_32(port, RIO_COMPONENT_TAG_CSR, &tag_csr); - return (tag_csr & 0xffff) ? 1 : 0; + rio_local_read_config_32(port, port->phys_efptr + RIO_PORT_GEN_CTL_CSR, + ®val); + return (regval & RIO_PORT_GEN_MASTER) ? 1 : 0; } /** @@ -991,6 +989,8 @@ rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid, break; } + if (ndestid == RIO_ANY_DESTID(port->sys_size)) + continue; rio_unlock_device(port, destid, hopcount); if (rio_disc_peer (net, port, ndestid, hopcount + 1) < 0) @@ -1163,6 +1163,10 @@ int __devinit rio_enum_mport(struct rio_mport *mport) /* Enable Input Output Port (transmitter reviever) */ rio_enable_rx_tx_port(mport, 1, 0, 0, 0); + /* Set component tag for host */ + rio_local_write_config_32(mport, RIO_COMPONENT_TAG_CSR, + next_comptag++); + if (rio_enum_peer(net, mport, 0, NULL, 0) < 0) { /* A higher priority host won enumeration, bail. */ printk(KERN_INFO diff --git a/drivers/rapidio/rio.c b/drivers/rapidio/rio.c index fa5e3cbe4c83..7f18a65c4ed0 100644 --- a/drivers/rapidio/rio.c +++ b/drivers/rapidio/rio.c @@ -443,7 +443,7 @@ rio_mport_get_physefb(struct rio_mport *port, int local, * @from is not %NULL, searches continue from next device on the global * list. */ -static struct rio_dev *rio_get_comptag(u32 comp_tag, struct rio_dev *from) +struct rio_dev *rio_get_comptag(u32 comp_tag, struct rio_dev *from) { struct list_head *n; struct rio_dev *rdev; @@ -507,7 +507,7 @@ static int rio_chk_dev_route(struct rio_dev *rdev, struct rio_dev **nrdev, int *npnum) { u32 result; - int p_port, rc = -EIO; + int p_port, dstid, rc = -EIO; struct rio_dev *prev = NULL; /* Find switch with failed RIO link */ @@ -522,20 +522,18 @@ rio_chk_dev_route(struct rio_dev *rdev, struct rio_dev **nrdev, int *npnum) if (prev == NULL) goto err_out; - /* Find port with failed RIO link */ - for (p_port = 0; - p_port < RIO_GET_TOTAL_PORTS(prev->swpinfo); p_port++) - if (prev->rswitch->nextdev[p_port] == rdev) - break; + dstid = (rdev->pef & RIO_PEF_SWITCH) ? + rdev->rswitch->destid : rdev->destid; + p_port = prev->rswitch->route_table[dstid]; - if (p_port < RIO_GET_TOTAL_PORTS(prev->swpinfo)) { + if (p_port != RIO_INVALID_ROUTE) { pr_debug("RIO: link failed on [%s]-P%d\n", rio_name(prev), p_port); *nrdev = prev; *npnum = p_port; rc = 0; } else - pr_debug("RIO: failed to trace route to %s\n", rio_name(prev)); + pr_debug("RIO: failed to trace route to %s\n", rio_name(rdev)); err_out: return rc; } diff --git a/drivers/rapidio/rio.h b/drivers/rapidio/rio.h index d249a1205c7d..b1af414f15e6 100644 --- a/drivers/rapidio/rio.h +++ b/drivers/rapidio/rio.h @@ -38,6 +38,7 @@ extern int rio_std_route_get_entry(struct rio_mport *mport, u16 destid, extern int rio_std_route_clr_table(struct rio_mport *mport, u16 destid, u8 hopcount, u16 table); extern int rio_set_port_lockout(struct rio_dev *rdev, u32 pnum, int lock); +extern struct rio_dev *rio_get_comptag(u32 comp_tag, struct rio_dev *from); /* Structures internal to the RIO core code */ extern struct device_attribute rio_dev_attrs[]; -- cgit v1.2.3