Re: [PATCH] Altix system controller communication driver
From: Greg Howard
Date: Fri Jul 30 2004 - 16:50:14 EST
Andrew, others--
Here's a cleaned-up version of altix-system-controller-driver.patch.
Many thanks to everybody who offered suggestions and help.
- Greg
Signed-off-by: Greg Howard <ghoward@xxxxxxx>
arch/ia64/configs/sn2_defconfig | 1
drivers/char/Kconfig | 7
drivers/char/Makefile | 1
drivers/char/snsc.c | 493 ++++++++++++++++++++++++++++++++++++++++
drivers/char/snsc.h | 50 ++++
drivers/serial/sn_console.c | 3
include/asm-ia64/sn/sn_sal.h | 142 +++++++++++
7 files changed, 695 insertions(+), 2 deletions(-)
diff -uprN -X dontdiff original/arch/ia64/configs/sn2_defconfig changed/arch/ia64/configs/sn2_defconfig
--- original/arch/ia64/configs/sn2_defconfig 2004-07-11 12:33:53.000000000 -0500
+++ changed/arch/ia64/configs/sn2_defconfig 2004-07-30 15:30:49.000000000 -0500
@@ -529,6 +529,7 @@ CONFIG_SERIAL_NONSTANDARD=y
# CONFIG_STALDRV is not set
CONFIG_SGI_L1_SERIAL=y
CONFIG_SGI_L1_SERIAL_CONSOLE=y
+CONFIG_SGI_SNSC=y
#
# Serial drivers
diff -uprN -X dontdiff original/drivers/char/Kconfig changed/drivers/char/Kconfig
--- original/drivers/char/Kconfig 2004-07-27 13:32:37.000000000 -0500
+++ changed/drivers/char/Kconfig 2004-07-30 15:30:49.000000000 -0500
@@ -424,6 +424,13 @@ config A2232
will also be built as a module. This has to be loaded before
"ser_a2232". If you want to do this, answer M here.
+config SGI_SNSC
+ bool "SGI Altix system controller communication support"
+ help
+ If you have an SGI Altix and you want to enable system
+ controller communication from user space (you want this!),
+ say Y. Otherwise, say N.
+
source "drivers/serial/Kconfig"
config UNIX98_PTYS
diff -uprN -X dontdiff original/drivers/char/Makefile changed/drivers/char/Makefile
--- original/drivers/char/Makefile 2004-07-27 13:32:37.000000000 -0500
+++ changed/drivers/char/Makefile 2004-07-30 15:30:49.000000000 -0500
@@ -41,6 +41,7 @@ obj-$(CONFIG_SX) += sx.o generic_serial
obj-$(CONFIG_RIO) += rio/ generic_serial.o
obj-$(CONFIG_HVC_CONSOLE) += hvc_console.o
obj-$(CONFIG_RAW_DRIVER) += raw.o
+obj-$(CONFIG_SGI_SNSC) += snsc.o
obj-$(CONFIG_VIOCONS) += viocons.o
obj-$(CONFIG_VIOTAPE) += viotape.o
diff -uprN -X dontdiff original/drivers/char/snsc.c changed/drivers/char/snsc.c
--- original/drivers/char/snsc.c 1969-12-31 18:00:00.000000000 -0600
+++ changed/drivers/char/snsc.c 2004-07-30 15:30:49.000000000 -0500
@@ -0,0 +1,493 @@
+/*
+ * SN Platform system controller communication support
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2004 Silicon Graphics, Inc. All rights reserved.
+ */
+
+/*
+ * System controller communication driver
+ *
+ * This driver allows a user process to communicate with the system
+ * controller (a.k.a. "IRouter") network in an SGI SN system.
+ */
+
+#include "snsc.h"
+#include <linux/interrupt.h>
+#include <linux/sched.h>
+#include <linux/device.h>
+#include <linux/poll.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <asm/sn/sn_sal.h>
+#include <asm/sn/nodepda.h>
+
+
+#define SYSCTL_BASENAME "snsc"
+
+#define SCDRV_BUFSZ 2048
+
+#ifdef SCDRV_DEBUG
+#define DPRINTF(x...) printk(x)
+#else
+#define DPRINTF(x...) do {} while(0)
+#endif
+
+static int scdrv_open(struct inode *, struct file *);
+static int scdrv_release(struct inode *, struct file *);
+static ssize_t scdrv_read(struct file *, char __user *, size_t, loff_t *);
+static ssize_t scdrv_write(struct file *, const char __user *,
+ size_t, loff_t *);
+static unsigned int scdrv_poll(struct file *, struct poll_table_struct *);
+static irqreturn_t scdrv_interrupt(int, void *, struct pt_regs *);
+
+static struct file_operations scdrv_fops = {
+ .owner = THIS_MODULE,
+ .read = scdrv_read,
+ .write = scdrv_write,
+ .poll = scdrv_poll,
+ .open = scdrv_open,
+ .release = scdrv_release,
+};
+
+/*
+ * scdrv_wait
+ *
+ * Call this function to wait on one of the queues associated with an
+ * open subchannel. Avoid races by entering this function with a held
+ * lock that protects the wait queue; don't release the lock until after
+ * we've added ourselves to the queue.
+ */
+static inline int
+scdrv_wait(wait_queue_head_t *waitq_head, spinlock_t *waitq_lock,
+ unsigned long flags, unsigned long timeout)
+{
+ DECLARE_WAITQUEUE(wait, current);
+ int ret;
+
+ add_wait_queue(waitq_head, &wait);
+ set_current_state(TASK_INTERRUPTIBLE);
+ spin_unlock_irqrestore(waitq_lock, flags);
+
+ if (timeout) {
+ ret = schedule_timeout(timeout);
+ } else {
+ schedule();
+ }
+
+ remove_wait_queue(waitq_head, &wait);
+
+ if (signal_pending(current)) {
+ return (timeout ? -ret : -1);
+ }
+ return (timeout ? ret : 1);
+}
+
+/*
+ * scdrv_init
+ *
+ * Called at boot time to initialize the system controller communication
+ * facility.
+ */
+int __init
+scdrv_init(void)
+{
+ geoid_t geoid;
+ cmoduleid_t cmod;
+ int i;
+ char devname[32];
+ char *devnamep;
+ module_t *m;
+ struct sysctl_data_s *scd;
+ void *salbuf;
+ struct class_simple *snsc_class;
+ dev_t first_dev, dev;
+
+ if (alloc_chrdev_region(&first_dev, 0, (MAX_SLABS*nummodules), "snsc")
+ < 0) {
+ printk("%s: failed to register SN system controller device\n",
+ __FUNCTION__);
+ return -ENODEV;
+ }
+ snsc_class = class_simple_create(THIS_MODULE, SYSCTL_BASENAME);
+
+ for (cmod = 0; cmod < nummodules; cmod++) {
+ m = sn_modules[cmod];
+ for (i = 0; i <= MAX_SLABS; i++) {
+
+ if (m->nodes[i] == -1) {
+ /* node is not alive in module */
+ continue;
+ }
+
+ geoid = m->geoid[i];
+ devnamep = devname;
+ format_module_id(devnamep, geo_module(geoid),
+ MODULE_FORMAT_BRIEF);
+ devnamep = devname + strlen(devname);
+ sprintf(devnamep, "#%d", geo_slab(geoid));
+
+ /* allocate sysctl device data */
+ scd = kmalloc(sizeof (struct sysctl_data_s),
+ GFP_KERNEL);
+ if (!scd) {
+ printk("%s: failed to allocate device info"
+ "for %s/%s\n", __FUNCTION__,
+ SYSCTL_BASENAME, devname);
+ continue;
+ }
+ memset(scd, 0, sizeof (struct sysctl_data_s));
+
+ /* initialize sysctl device data fields */
+ scd->scd_nasid = cnodeid_to_nasid(m->nodes[i]);
+ if (!(salbuf = kmalloc(SCDRV_BUFSZ, GFP_KERNEL))) {
+ printk("%s: failed to allocate driver buffer"
+ "(%s%s)\n", __FUNCTION__,
+ SYSCTL_BASENAME, devname);
+ kfree(scd);
+ continue;
+ }
+
+ if (ia64_sn_irtr_init(scd->scd_nasid, salbuf,
+ SCDRV_BUFSZ) < 0) {
+ printk
+ ("%s: failed to initialize SAL for"
+ " system controller communication"
+ " (%s/%s): outdated PROM?\n",
+ __FUNCTION__, SYSCTL_BASENAME, devname);
+ kfree(scd);
+ kfree(salbuf);
+ continue;
+ }
+
+ dev = first_dev + m->nodes[i];
+ cdev_init(&scd->scd_cdev, &scdrv_fops);
+ if (cdev_add(&scd->scd_cdev, dev, 1)) {
+ printk("%s: failed to register system"
+ " controller device (%s%s)\n",
+ __FUNCTION__, SYSCTL_BASENAME, devname);
+ kfree(scd);
+ kfree(salbuf);
+ continue;
+ }
+
+ class_simple_device_add(snsc_class, dev, NULL,
+ "%s", devname);
+
+ ia64_sn_irtr_intr_enable(scd->scd_nasid,
+ 0 /*ignored */ ,
+ SAL_IROUTER_INTR_RECV);
+ }
+ }
+ return 0;
+}
+
+/*
+ * scdrv_open
+ *
+ * Reserve a subchannel for system controller communication.
+ */
+
+static int
+scdrv_open(struct inode *inode, struct file *file)
+{
+ struct sysctl_data_s *scd;
+ struct subch_data_s *sd;
+ int rv;
+
+ /* look up device info for this device file */
+ scd = container_of(inode->i_cdev, struct sysctl_data_s, scd_cdev);
+
+ if (!scd) {
+ printk("%s: no such device\n", __FUNCTION__);
+ return -ENODEV;
+ }
+
+ /* allocate memory for subchannel data */
+ sd = kmalloc(sizeof (struct subch_data_s), GFP_KERNEL);
+ if (sd == NULL) {
+ printk("%s: couldn't allocate subchannel data\n",
+ __FUNCTION__);
+ return -ENOMEM;
+ }
+
+ /* initialize subch_data_s fields */
+ memset(sd, 0, sizeof (struct subch_data_s));
+ sd->sd_nasid = scd->scd_nasid;
+ sd->sd_subch = ia64_sn_irtr_open(scd->scd_nasid);
+
+ if (sd->sd_subch < 0) {
+ kfree(sd);
+ printk("%s: couldn't allocate subchannel\n", __FUNCTION__);
+ return -EBUSY;
+ }
+
+ spin_lock_init(&sd->sd_rlock);
+ spin_lock_init(&sd->sd_wlock);
+ init_waitqueue_head(&sd->sd_rq);
+ init_waitqueue_head(&sd->sd_wq);
+ sema_init(&sd->sd_rbs, 1);
+ sema_init(&sd->sd_wbs, 1);
+
+ file->private_data = sd;
+
+ /* hook this subchannel up to the system controller interrupt */
+ rv = request_irq(SGI_UART_VECTOR, scdrv_interrupt,
+ SA_SHIRQ | SA_INTERRUPT,
+ SYSCTL_BASENAME, sd);
+ if (rv) {
+ ia64_sn_irtr_close(sd->sd_nasid, sd->sd_subch);
+ kfree(sd);
+ printk("%s: irq request failed (%d)\n", __FUNCTION__, rv);
+ return -EBUSY;
+ }
+
+ return 0;
+}
+
+/*
+ * scdrv_release
+ *
+ * Release a previously-reserved subchannel.
+ */
+
+static int
+scdrv_release(struct inode *inode, struct file *file)
+{
+ struct subch_data_s *sd = (struct subch_data_s *) file->private_data;
+ int rv;
+
+ /* free the interrupt */
+ free_irq(SGI_UART_VECTOR, sd);
+
+ /* ask SAL to close the subchannel */
+ rv = ia64_sn_irtr_close(sd->sd_nasid, sd->sd_subch);
+
+ kfree(sd);
+ return rv;
+}
+
+/*
+ * scdrv_read
+ *
+ * Called to read bytes from the open IRouter pipe.
+ *
+ */
+
+static inline int
+read_status_check(struct subch_data_s *sd, int *len)
+{
+ return ia64_sn_irtr_recv(sd->sd_nasid, sd->sd_subch, sd->sd_rb, len);
+}
+
+static ssize_t
+scdrv_read(struct file *file, char __user *buf, size_t count, loff_t *f_pos)
+{
+ int status;
+ int len;
+ unsigned long flags;
+ struct subch_data_s *sd = (struct subch_data_s *) file->private_data;
+
+ /* try to get control of the read buffer */
+ if (down_trylock(&sd->sd_rbs)) {
+ /* somebody else has it now;
+ * if we're non-blocking, then exit...
+ */
+ if (file->f_flags & O_NONBLOCK) {
+ return -EAGAIN;
+ }
+ /* ...or if we want to block, then do so here */
+ if (down_interruptible(&sd->sd_rbs)) {
+ /* something went wrong with wait */
+ return -ERESTARTSYS;
+ }
+ }
+
+ /* anything to read? */
+ len = CHUNKSIZE;
+ spin_lock_irqsave(&sd->sd_rlock, flags);
+ status = read_status_check(sd, &len);
+
+ /* if not, and we're blocking I/O, loop */
+ while (status < 0) {
+ if (file->f_flags & O_NONBLOCK) {
+ spin_unlock_irqrestore(&sd->sd_rlock, flags);
+ return -EAGAIN;
+ }
+ len = CHUNKSIZE;
+ if (scdrv_wait(&sd->sd_rq, &sd->sd_rlock, flags, 1000) < 0) {
+ /* something went wrong with wait */
+ return -ERESTARTSYS;
+ }
+ /* sd->sd_rlock was unlocked by scdrv_wait(), above */
+ spin_lock_irqsave(&sd->sd_rlock, flags);
+ status = read_status_check(sd, &len);
+ }
+ spin_unlock_irqrestore(&sd->sd_rlock, flags);
+
+ if (len > 0) {
+ /* we read something in the last read_status_check(); copy
+ * it out to user space
+ */
+ if (count < len) {
+ DPRINTF("%s: only accepting %d of %d bytes\n",
+ __FUNCTION__, (int) count, len);
+ }
+ len = min((int) count, len);
+ if (copy_to_user(buf, sd->sd_rb, len))
+ return -EFAULT;
+ }
+
+ /* release the read buffer and wake anyone who might be
+ * waiting for it
+ */
+ up(&sd->sd_rbs);
+
+ /* return the number of characters read in */
+ return len;
+}
+
+/*
+ * scdrv_write
+ *
+ * Writes a chunk of an IRouter packet (or other system controller data)
+ * to the system controller.
+ *
+ */
+static inline int
+write_status_check(struct subch_data_s *sd, int count)
+{
+ return ia64_sn_irtr_send(sd->sd_nasid, sd->sd_subch, sd->sd_wb, count);
+}
+
+static ssize_t
+scdrv_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *f_pos)
+{
+ unsigned long flags;
+ int status;
+ struct subch_data_s *sd = (struct subch_data_s *) file->private_data;
+
+ /* try to get control of the write buffer */
+ if (down_trylock(&sd->sd_wbs)) {
+ /* somebody else has it now;
+ * if we're non-blocking, then exit...
+ */
+ if (file->f_flags & O_NONBLOCK) {
+ return -EAGAIN;
+ }
+ /* ...or if we want to block, then do so here */
+ if (down_interruptible(&sd->sd_wbs)) {
+ /* something went wrong with wait */
+ return -ERESTARTSYS;
+ }
+ }
+
+ count = min((int) count, CHUNKSIZE);
+ if (copy_from_user(sd->sd_wb, buf, count))
+ return -EFAULT;
+
+ /* try to send the buffer */
+ spin_lock_irqsave(&sd->sd_wlock, flags);
+ status = write_status_check(sd, count);
+
+ /* if we failed, and we want to block, then loop */
+ while (status <= 0) {
+ if (file->f_flags & O_NONBLOCK) {
+ spin_unlock(&sd->sd_wlock);
+ return -EAGAIN;
+ }
+ if (scdrv_wait(&sd->sd_wq, &sd->sd_wlock, flags, 1000) < 0) {
+ /* something went wrong with wait */
+ return -ERESTARTSYS;
+ }
+
+ /* sd->sd_wlock was unlocked by scdrv_wait(), above */
+ spin_lock_irqsave(&sd->sd_wlock, flags);
+ status = write_status_check(sd, count);
+ }
+ spin_unlock_irqrestore(&sd->sd_wlock, flags);
+
+ /* release the write buffer and wake anyone who's waiting for it */
+ up(&sd->sd_wbs);
+
+ /* return the number of characters accepted (should be the complete
+ * "chunk" as requested)
+ */
+ if ((status >= 0) && (status < count)) {
+ DPRINTF("Didn't accept the full chunk; %d of %d\n",
+ status, (int) count);
+ }
+ return status;
+}
+
+static inline void
+scdrv_lock_all(struct subch_data_s *sd, unsigned long *flags)
+{
+ spin_lock_irqsave(&sd->sd_rlock, *flags);
+ spin_lock(&sd->sd_wlock);
+}
+
+static inline void
+scdrv_unlock_all(struct subch_data_s *sd, unsigned long flags)
+{
+ spin_unlock(&sd->sd_wlock);
+ spin_unlock_irqrestore(&sd->sd_rlock, flags);
+}
+
+static unsigned int
+scdrv_poll(struct file *file, struct poll_table_struct *wait)
+{
+ unsigned int mask = 0;
+ int status = 0;
+ struct subch_data_s *sd = (struct subch_data_s *) file->private_data;
+ unsigned long flags;
+
+ poll_wait(file, &sd->sd_rq, wait);
+ poll_wait(file, &sd->sd_wq, wait);
+
+ scdrv_lock_all(sd, &flags);
+ status = ia64_sn_irtr_intr(sd->sd_nasid, sd->sd_subch);
+ scdrv_unlock_all(sd, flags);
+
+ if (status > 0) {
+ if (status & SAL_IROUTER_INTR_RECV) {
+ mask |= POLLIN | POLLRDNORM;
+ }
+ if (status & SAL_IROUTER_INTR_XMIT) {
+ mask |= POLLOUT | POLLWRNORM;
+ }
+ }
+
+ return mask;
+}
+
+static irqreturn_t
+scdrv_interrupt(int irq, void *subch_data, struct pt_regs *regs)
+{
+ struct subch_data_s *sd = (struct subch_data_s *) subch_data;
+ unsigned long flags;
+ int status;
+
+ scdrv_lock_all(sd, &flags);
+ status = ia64_sn_irtr_intr(sd->sd_nasid, sd->sd_subch);
+
+ if (status > 0) {
+ if (status & SAL_IROUTER_INTR_RECV) {
+ wake_up_all(&sd->sd_rq);
+ }
+ if (status & SAL_IROUTER_INTR_XMIT) {
+ ia64_sn_irtr_intr_disable
+ (sd->sd_nasid, sd->sd_subch,
+ SAL_IROUTER_INTR_XMIT);
+ wake_up_all(&sd->sd_wq);
+ }
+ }
+ scdrv_unlock_all(sd, flags);
+ return IRQ_HANDLED;
+}
+
+module_init(scdrv_init);
diff -uprN -X dontdiff original/drivers/char/snsc.h changed/drivers/char/snsc.h
--- original/drivers/char/snsc.h 1969-12-31 18:00:00.000000000 -0600
+++ changed/drivers/char/snsc.h 2004-07-30 15:30:49.000000000 -0500
@@ -0,0 +1,50 @@
+/*
+ * SN Platform system controller communication support
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2004 Silicon Graphics, Inc. All rights reserved.
+ */
+
+/*
+ * This file contains macros and data types for communication with the
+ * system controllers in SGI SN systems.
+ */
+
+#ifndef _SN_SYSCTL_H_
+#define _SN_SYSCTL_H_
+
+#include <linux/types.h>
+#include <linux/spinlock.h>
+#include <linux/wait.h>
+#include <linux/kobject.h>
+#include <linux/fs.h>
+#include <linux/cdev.h>
+#include <asm/sn/types.h>
+#include <asm/semaphore.h>
+
+#define CHUNKSIZE 127
+
+/* This structure is used to track an open subchannel. */
+struct subch_data_s {
+ nasid_t sd_nasid; /* node on which the subchannel was opened */
+ int sd_subch; /* subchannel number */
+ spinlock_t sd_rlock; /* monitor lock for rsv */
+ spinlock_t sd_wlock; /* monitor lock for wsv */
+ wait_queue_head_t sd_rq; /* wait queue for readers */
+ wait_queue_head_t sd_wq; /* wait queue for writers */
+ struct semaphore sd_rbs; /* semaphore for read buffer */
+ struct semaphore sd_wbs; /* semaphore for write buffer */
+
+ char sd_rb[CHUNKSIZE]; /* read buffer */
+ char sd_wb[CHUNKSIZE]; /* write buffer */
+};
+
+struct sysctl_data_s {
+ struct cdev scd_cdev; /* Character device info */
+ nasid_t scd_nasid; /* Node on which subchannels are opened. */
+};
+
+#endif /* _SN_SYSCTL_H_ */
diff -uprN -X dontdiff original/drivers/serial/sn_console.c changed/drivers/serial/sn_console.c
--- original/drivers/serial/sn_console.c 2004-07-27 13:32:38.000000000 -0500
+++ changed/drivers/serial/sn_console.c 2004-07-30 15:30:49.000000000 -0500
@@ -712,7 +712,8 @@ sn_sal_interrupt(int irq, void *dev_id,
static int
sn_sal_connect_interrupt(struct sn_cons_port *port)
{
- if (request_irq(SGI_UART_VECTOR, sn_sal_interrupt, SA_INTERRUPT,
+ if (request_irq(SGI_UART_VECTOR, sn_sal_interrupt,
+ SA_INTERRUPT | SA_SHIRQ,
"SAL console driver", port) >= 0) {
return SGI_UART_VECTOR;
}
diff -uprN -X dontdiff original/include/asm-ia64/sn/sn_sal.h changed/include/asm-ia64/sn/sn_sal.h
--- original/include/asm-ia64/sn/sn_sal.h 2004-07-11 12:35:31.000000000 -0500
+++ changed/include/asm-ia64/sn/sn_sal.h 2004-07-30 15:30:49.000000000 -0500
@@ -8,7 +8,7 @@
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
- * Copyright (c) 2000-2003 Silicon Graphics, Inc. All rights reserved.
+ * Copyright (c) 2000-2004 Silicon Graphics, Inc. All rights reserved.
*/
@@ -60,6 +60,7 @@
#define SN_SAL_SYSCTL_FRU_CAPTURE 0x0200003f
#define SN_SAL_SYSCTL_IOBRICK_PCI_OP 0x02000042 // reentrant
+#define SN_SAL_IROUTER_OP 0x02000043
/*
* Service-specific constants
@@ -86,6 +87,25 @@
#endif /* CONFIG_HOTPLUG_PCI_SGI */
/*
+ * IRouter (i.e. generalized system controller) operations
+ */
+#define SAL_IROUTER_OPEN 0 /* open a subchannel */
+#define SAL_IROUTER_CLOSE 1 /* close a subchannel */
+#define SAL_IROUTER_SEND 2 /* send part of an IRouter packet */
+#define SAL_IROUTER_RECV 3 /* receive part of an IRouter packet */
+#define SAL_IROUTER_INTR_STATUS 4 /* check the interrupt status for
+ * an open subchannel
+ */
+#define SAL_IROUTER_INTR_ON 5 /* enable an interrupt */
+#define SAL_IROUTER_INTR_OFF 6 /* disable an interrupt */
+#define SAL_IROUTER_INIT 7 /* initialize IRouter driver */
+
+/* IRouter interrupt mask bits */
+#define SAL_IROUTER_INTR_XMIT SAL_CONSOLE_INTR_XMIT
+#define SAL_IROUTER_INTR_RECV SAL_CONSOLE_INTR_RECV
+
+
+/*
* SN_SAL_GET_PARTITION_ADDR return constants
*/
#define SALRET_MORE_PASSES 1
@@ -704,4 +724,124 @@ ia64_sn_set_error_handling_features(cons
return rv.status;
}
+
+/*
+ * Open a subchannel for sending arbitrary data to the system
+ * controller network via the system controller device associated with
+ * 'nasid'. Return the subchannel number or a negative error code.
+ */
+static inline int
+ia64_sn_irtr_open(nasid_t nasid)
+{
+ struct ia64_sal_retval rv;
+ SAL_CALL_REENTRANT(rv, SN_SAL_IROUTER_OP, SAL_IROUTER_OPEN, nasid,
+ 0, 0, 0, 0, 0);
+ return (int) rv.v0;
+}
+
+/*
+ * Close system controller subchannel 'subch' previously opened on 'nasid'.
+ */
+static inline int
+ia64_sn_irtr_close(nasid_t nasid, int subch)
+{
+ struct ia64_sal_retval rv;
+ SAL_CALL_REENTRANT(rv, SN_SAL_IROUTER_OP, SAL_IROUTER_CLOSE,
+ (u64) nasid, (u64) subch, 0, 0, 0, 0);
+ return (int) rv.status;
+}
+
+/*
+ * Read data from system controller associated with 'nasid' on
+ * subchannel 'subch'. The buffer to be filled is pointed to by
+ * 'buf', and its capacity is in the integer pointed to by 'len'. The
+ * referent of 'len' is set to the number of bytes read by the SAL
+ * call. The return value is either SALRET_OK (for bytes read) or
+ * SALRET_ERROR (for error or "no data available").
+ */
+static inline int
+ia64_sn_irtr_recv(nasid_t nasid, int subch, char *buf, int *len)
+{
+ struct ia64_sal_retval rv;
+ SAL_CALL_REENTRANT(rv, SN_SAL_IROUTER_OP, SAL_IROUTER_RECV,
+ (u64) nasid, (u64) subch, (u64) buf, (u64) len,
+ 0, 0);
+ return (int) rv.status;
+}
+
+/*
+ * Write data to the system controller network via the system
+ * controller associated with 'nasid' on suchannel 'subch'. The
+ * buffer to be written out is pointed to by 'buf', and 'len' is the
+ * number of bytes to be written. The return value is either the
+ * number of bytes written (which could be zero) or a negative error
+ * code.
+ */
+static inline int
+ia64_sn_irtr_send(nasid_t nasid, int subch, char *buf, int len)
+{
+ struct ia64_sal_retval rv;
+ SAL_CALL_REENTRANT(rv, SN_SAL_IROUTER_OP, SAL_IROUTER_SEND,
+ (u64) nasid, (u64) subch, (u64) buf, (u64) len,
+ 0, 0);
+ return (int) rv.v0;
+}
+
+/*
+ * Check whether any interrupts are pending for the system controller
+ * associated with 'nasid' and its subchannel 'subch'. The return
+ * value is a mask of pending interrupts (SAL_IROUTER_INTR_XMIT and/or
+ * SAL_IROUTER_INTR_RECV).
+ */
+static inline int
+ia64_sn_irtr_intr(nasid_t nasid, int subch)
+{
+ struct ia64_sal_retval rv;
+ SAL_CALL_REENTRANT(rv, SN_SAL_IROUTER_OP, SAL_IROUTER_INTR_STATUS,
+ (u64) nasid, (u64) subch, 0, 0, 0, 0);
+ return (int) rv.v0;
+}
+
+/*
+ * Enable the interrupt indicated by the intr parameter (either
+ * SAL_IROUTER_INTR_XMIT or SAL_IROUTER_INTR_RECV).
+ */
+static inline int
+ia64_sn_irtr_intr_enable(nasid_t nasid, int subch, u64 intr)
+{
+ struct ia64_sal_retval rv;
+ SAL_CALL_REENTRANT(rv, SN_SAL_IROUTER_OP, SAL_IROUTER_INTR_ON,
+ (u64) nasid, (u64) subch, intr, 0, 0, 0);
+ return (int) rv.v0;
+}
+
+/*
+ * Disable the interrupt indicated by the intr parameter (either
+ * SAL_IROUTER_INTR_XMIT or SAL_IROUTER_INTR_RECV).
+ */
+static inline int
+ia64_sn_irtr_intr_disable(nasid_t nasid, int subch, u64 intr)
+{
+ struct ia64_sal_retval rv;
+ SAL_CALL_REENTRANT(rv, SN_SAL_IROUTER_OP, SAL_IROUTER_INTR_OFF,
+ (u64) nasid, (u64) subch, intr, 0, 0, 0);
+ return (int) rv.v0;
+}
+
+/*
+ * Initialize the SAL components of the system controller
+ * communication driver; specifically pass in a sizable buffer that
+ * can be used for allocation of subchannel queues as new subchannels
+ * are opened. "buf" points to the buffer, and "len" specifies its
+ * length.
+ */
+static inline int
+ia64_sn_irtr_init(nasid_t nasid, void *buf, int len)
+{
+ struct ia64_sal_retval rv;
+ SAL_CALL_REENTRANT(rv, SN_SAL_IROUTER_OP, SAL_IROUTER_INIT,
+ (u64) nasid, (u64) buf, (u64) len, 0, 0, 0);
+ return (int) rv.status;
+}
+
#endif /* _ASM_IA64_SN_SN_SAL_H */
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