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Subject[PATCH 9 of 18] ipath - char devices for diagnostics and lightweight subnet management
Date
From
The ipath_diag.c file permits userspace diagnostic tools to read and
write a chip's registers. It is different in purpose from the mmap
interfaces to the /sys/bus/pci resource files.

The ipath_sma.c file supports a lightweight userspace subnet management
agent (SMA). This is used in deployments (such as HPC clusters) where
a full Infiniband protocol stack is not needed. The facilities provided
by ipath_sma.c are also used by userspace hardware diagnostic tools.

Signed-off-by: Bryan O'Sullivan <bos@pathscale.com>

diff -r d408c327e562 -r 26cb45d8d61c drivers/infiniband/hw/ipath/ipath_diag.c
--- /dev/null Thu Jan 1 00:00:00 1970 +0000
+++ b/drivers/infiniband/hw/ipath/ipath_diag.c Thu Mar 23 20:27:45 2006 -0800
@@ -0,0 +1,379 @@
+/*
+ * Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+/*
+ * This file contains support for diagnostic functions. It is accessed by
+ * opening the ipath_diag device, normally minor number 129. Diagnostic use
+ * of the InfiniPath chip may render the chip or board unusable until the
+ * driver is unloaded, or in some cases, until the system is rebooted.
+ *
+ * Accesses to the chip through this interface are not similar to going
+ * through the /sys/bus/pci resource mmap interface.
+ */
+
+#include <linux/pci.h>
+#include <asm/uaccess.h>
+
+#include "ipath_common.h"
+#include "ipath_kernel.h"
+#include "ips_common.h"
+#include "ipath_layer.h"
+
+int ipath_diag_inuse;
+static int diag_set_link;
+
+static int ipath_diag_open(struct inode *in, struct file *fp);
+static int ipath_diag_release(struct inode *in, struct file *fp);
+static ssize_t ipath_diag_read(struct file *fp, char __user *data,
+ size_t count, loff_t *off);
+static ssize_t ipath_diag_write(struct file *fp, const char __user *data,
+ size_t count, loff_t *off);
+
+static struct file_operations diag_file_ops = {
+ .owner = THIS_MODULE,
+ .write = ipath_diag_write,
+ .read = ipath_diag_read,
+ .open = ipath_diag_open,
+ .release = ipath_diag_release
+};
+
+static struct cdev *diag_cdev;
+static struct class_device *diag_class_dev;
+
+int ipath_diag_init(void)
+{
+ return ipath_cdev_init(IPATH_DIAG_MINOR, "ipath_diag",
+ &diag_file_ops, &diag_cdev, &diag_class_dev);
+}
+
+void ipath_diag_cleanup(void)
+{
+ ipath_cdev_cleanup(&diag_cdev, &diag_class_dev);
+}
+
+/**
+ * ipath_read_umem64 - read a 64-bit quantity from the chip into user space
+ * @dd: the infinipath device
+ * @uaddr: the location to store the data in user memory
+ * @caddr: the source chip address (full pointer, not offset)
+ * @count: number of bytes to copy (multiple of 32 bits)
+ *
+ * This function also localizes all chip memory accesses.
+ * The copy should be written such that we read full cacheline packets
+ * from the chip. This is usually used for a single qword
+ *
+ * NOTE: This assumes the chip address is 64-bit aligned.
+ */
+static int ipath_read_umem64(struct ipath_devdata *dd, void __user *uaddr,
+ const void __iomem *caddr, size_t count)
+{
+ const u64 __iomem *reg_addr = caddr;
+ const u64 __iomem *reg_end = reg_addr + (count / sizeof(u64));
+ int ret;
+
+ /* not very efficient, but it works for now */
+ if (reg_addr < dd->ipath_kregbase ||
+ reg_end > dd->ipath_kregend) {
+ ret = -EINVAL;
+ goto bail;
+ }
+ while (reg_addr < reg_end) {
+ u64 data = readq(reg_addr);
+ if (copy_to_user(uaddr, &data, sizeof(u64))) {
+ ret = -EFAULT;
+ goto bail;
+ }
+ reg_addr++;
+ uaddr++;
+ }
+ ret = 0;
+bail:
+ return ret;
+}
+
+/**
+ * ipath_write_umem64 - write a 64-bit quantity to the chip from user space
+ * @dd: the infinipath device
+ * @caddr: the destination chip address (full pointer, not offset)
+ * @uaddr: the source of the data in user memory
+ * @count: the number of bytes to copy (multiple of 32 bits)
+ *
+ * This is usually used for a single qword
+ * NOTE: This assumes the chip address is 64-bit aligned.
+ */
+
+static int ipath_write_umem64(struct ipath_devdata *dd, void __iomem *caddr,
+ const void __user *uaddr, size_t count)
+{
+ u64 __iomem *reg_addr = caddr;
+ const u64 __iomem *reg_end = reg_addr + (count / sizeof(u64));
+ int ret;
+
+ /* not very efficient, but it works for now */
+ if (reg_addr < dd->ipath_kregbase ||
+ reg_end > dd->ipath_kregend) {
+ ret = -EINVAL;
+ goto bail;
+ }
+ while (reg_addr < reg_end) {
+ u64 data;
+ if (copy_from_user(&data, uaddr, sizeof(data))) {
+ ret = -EFAULT;
+ goto bail;
+ }
+ writeq(data, reg_addr);
+
+ reg_addr++;
+ uaddr++;
+ }
+ ret = 0;
+bail:
+ return ret;
+}
+
+/**
+ * ipath_read_umem32 - read a 32-bit quantity from the chip into user space
+ * @dd: the infinipath device
+ * @uaddr: the location to store the data in user memory
+ * @caddr: the source chip address (full pointer, not offset)
+ * @count: number of bytes to copy
+ *
+ * read 32 bit values, not 64 bit; for memories that only
+ * support 32 bit reads; usually a single dword.
+ */
+static int ipath_read_umem32(struct ipath_devdata *dd, void __user *uaddr,
+ const void __iomem *caddr, size_t count)
+{
+ const u32 __iomem *reg_addr = caddr;
+ const u32 __iomem *reg_end = reg_addr + (count / sizeof(u32));
+ int ret;
+
+ if (reg_addr < (u32 __iomem *) dd->ipath_kregbase ||
+ reg_end > (u32 __iomem *) dd->ipath_kregend) {
+ ret = -EINVAL;
+ goto bail;
+ }
+ /* not very efficient, but it works for now */
+ while (reg_addr < reg_end) {
+ u32 data = readl(reg_addr);
+ if (copy_to_user(uaddr, &data, sizeof(data))) {
+ ret = -EFAULT;
+ goto bail;
+ }
+
+ reg_addr++;
+ uaddr++;
+ }
+ ret = 0;
+bail:
+ return ret;
+}
+
+/**
+ * ipath_write_umem32 - write a 32-bit quantity to the chip from user space
+ * @dd: the infinipath device
+ * @caddr: the destination chip address (full pointer, not offset)
+ * @uaddr: the source of the data in user memory
+ * @count: number of bytes to copy
+ *
+ * write 32 bit values, not 64 bit; for memories that only
+ * support 32 bit write; usually a single dword.
+ */
+
+static int ipath_write_umem32(struct ipath_devdata *dd, void __iomem *caddr,
+ const void __user *uaddr, size_t count)
+{
+ u32 __iomem *reg_addr = caddr;
+ const u32 __iomem *reg_end = reg_addr + (count / sizeof(u32));
+ int ret;
+
+ if (reg_addr < (u32 __iomem *) dd->ipath_kregbase ||
+ reg_end > (u32 __iomem *) dd->ipath_kregend) {
+ ret = -EINVAL;
+ goto bail;
+ }
+ while (reg_addr < reg_end) {
+ u32 data;
+ if (copy_from_user(&data, uaddr, sizeof(data))) {
+ ret = -EFAULT;
+ goto bail;
+ }
+ writel(data, reg_addr);
+
+ reg_addr++;
+ uaddr++;
+ }
+ ret = 0;
+bail:
+ return ret;
+}
+
+static int ipath_diag_open(struct inode *in, struct file *fp)
+{
+ struct ipath_devdata *dd;
+ int unit = 0; /* XXX this is bogus */
+ unsigned long flags;
+ int ret;
+
+ dd = ipath_lookup(unit);
+
+ mutex_lock(&ipath_mutex);
+ spin_lock_irqsave(&ipath_devs_lock, flags);
+
+ if (ipath_diag_inuse) {
+ ret = -EBUSY;
+ goto bail;
+ }
+
+ list_for_each_entry(dd, &ipath_dev_list, ipath_list) {
+ /*
+ * we need at least one infinipath device to be present
+ * (don't use INITTED, because we want to be able to open
+ * even if device is in freeze mode, which cleared INITTED).
+ * There is a small amount of risk to this, which is why we
+ * also verify kregbase is set.
+ */
+
+ if (!(dd->ipath_flags & IPATH_PRESENT) ||
+ !dd->ipath_kregbase)
+ continue;
+
+ ipath_diag_inuse = 1;
+ diag_set_link = 0;
+ ret = 0;
+ goto bail;
+ }
+
+ ret = -ENODEV;
+
+bail:
+ spin_unlock_irqrestore(&ipath_devs_lock, flags);
+ mutex_unlock(&ipath_mutex);
+
+ /* Only expose a way to reset the device if we
+ make it into diag mode. */
+ if (ret == 0)
+ ipath_expose_reset(&dd->pcidev->dev);
+
+ return ret;
+}
+
+static int ipath_diag_release(struct inode *i, struct file *f)
+{
+ mutex_lock(&ipath_mutex);
+ ipath_diag_inuse = 0;
+ mutex_unlock(&ipath_mutex);
+ return 0;
+}
+
+static ssize_t ipath_diag_read(struct file *fp, char __user *data,
+ size_t count, loff_t *off)
+{
+ int unit = 0; /* XXX provide for reads on other units some day */
+ struct ipath_devdata *dd;
+ void __iomem *kreg_base;
+ ssize_t ret;
+
+ dd = ipath_lookup(unit);
+ if (!dd) {
+ ret = -ENODEV;
+ goto bail;
+ }
+
+ kreg_base = dd->ipath_kregbase;
+
+ if (count == 0)
+ ret = 0;
+ else if ((count % 4) || (*off % 4))
+ /* address or length is not 32-bit aligned, hence invalid */
+ ret = -EINVAL;
+ else if ((count % 8) || (*off % 8))
+ /* address or length not 64-bit aligned; do 32-bit reads */
+ ret = ipath_read_umem32(dd, data, kreg_base + *off, count);
+ else
+ ret = ipath_read_umem64(dd, data, kreg_base + *off, count);
+
+ if (ret >= 0) {
+ *off += count;
+ ret = count;
+ }
+
+bail:
+ return ret;
+}
+
+static ssize_t ipath_diag_write(struct file *fp, const char __user *data,
+ size_t count, loff_t *off)
+{
+ int unit = 0; /* XXX this is bogus */
+ struct ipath_devdata *dd;
+ void __iomem *kreg_base;
+ ssize_t ret;
+
+ dd = ipath_lookup(unit);
+ if (!dd) {
+ ret = -ENODEV;
+ goto bail;
+ }
+ kreg_base = dd->ipath_kregbase;
+
+ if (count == 0)
+ ret = 0;
+ else if ((count % 4) || (*off % 4))
+ /* address or length is not 32-bit aligned, hence invalid */
+ ret = -EINVAL;
+ else if ((count % 8) || (*off % 8))
+ /* address or length not 64-bit aligned; do 32-bit writes */
+ ret = ipath_write_umem32(dd, kreg_base + *off, data, count);
+ else
+ ret = ipath_write_umem64(dd, kreg_base + *off, data, count);
+
+ if (ret >= 0) {
+ *off += count;
+ ret = count;
+ }
+
+bail:
+ return ret;
+}
+
+void ipath_diag_bringup_link(struct ipath_devdata *dd)
+{
+ if (diag_set_link || (dd->ipath_flags & IPATH_LINKACTIVE))
+ return;
+
+ diag_set_link = 1;
+ ipath_cdbg(VERBOSE, "Trying to set to set link active for "
+ "diag pkt\n");
+ ipath_layer_set_linkstate(dd, IPATH_IB_LINKARM);
+ ipath_layer_set_linkstate(dd, IPATH_IB_LINKACTIVE);
+}
diff -r d408c327e562 -r 26cb45d8d61c drivers/infiniband/hw/ipath/ipath_sma.c
--- /dev/null Thu Jan 1 00:00:00 1970 +0000
+++ b/drivers/infiniband/hw/ipath/ipath_sma.c Thu Mar 23 20:27:45 2006 -0800
@@ -0,0 +1,390 @@
+/*
+ * Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <linux/io.h>
+#include <linux/pci.h>
+#include <linux/cdev.h>
+#include <linux/vmalloc.h>
+#include <asm/uaccess.h>
+
+#include "ipath_kernel.h"
+#include "ips_common.h"
+#include "ipath_layer.h"
+
+int ipath_sma_inuse;
+DEFINE_SPINLOCK(ipath_sma_lock); /* SMA receive */
+
+/* max SM received packets we'll queue; we keep the most recent packets. */
+
+struct _ipath_sma_rpkt ipath_sma_data[IPATH_NUM_SMA_PKTS];
+
+unsigned ipath_sma_first; /* oldest sma packet index */
+unsigned ipath_sma_next; /* next sma packet index to use */
+
+/*
+ * ipath_sma_data_bufs has one extra, pointed to by ipath_sma_data_spare,
+ * so we can exchange buffers to do copy_to_user, and not hold the lock
+ * across the copy_to_user().
+ */
+
+u8 ipath_sma_data_bufs[IPATH_NUM_SMA_PKTS + 1][IPATH_SMA_MAX_PKTSZ];
+u8 *ipath_sma_data_spare;
+/* sma waits globally on all units */
+wait_queue_head_t ipath_sma_wait;
+wait_queue_head_t ipath_sma_state_wait;
+
+static int ipath_sma_open(struct inode *in, struct file *fp);
+static int ipath_sma_release(struct inode *in, struct file *fp);
+static ssize_t ipath_sma_read(struct file *fp, char __user *data,
+ size_t count, loff_t *off);
+static ssize_t ipath_sma_write(struct file *fp, const char __user *data,
+ size_t count, loff_t *off);
+
+static struct file_operations sma_file_ops = {
+ .owner = THIS_MODULE,
+ .write = ipath_sma_write,
+ .read = ipath_sma_read,
+ .open = ipath_sma_open,
+ .release = ipath_sma_release
+};
+
+static struct cdev *sma_cdev;
+static struct class_device *sma_class_dev;
+
+int ipath_sma_init(void)
+{
+ return ipath_cdev_init(IPATH_SMA_MINOR, "ipath_sma", &sma_file_ops,
+ &sma_cdev, &sma_class_dev);
+}
+
+void ipath_sma_cleanup(void)
+{
+ ipath_cdev_cleanup(&sma_cdev, &sma_class_dev);
+}
+
+static int ipath_sma_open(struct inode *in, struct file *fp)
+{
+ struct ipath_devdata *dd;
+ unsigned long flags;
+ int ret;
+
+ spin_lock_irqsave(&ipath_sma_lock, flags);
+ spin_lock(&ipath_devs_lock);
+
+ if (ipath_sma_inuse) {
+ ret = -EBUSY;
+ goto bail;
+ }
+
+ list_for_each_entry(dd, &ipath_dev_list, ipath_list) {
+ /*
+ * we need at least one infinipath device to be
+ * initialized.
+ */
+ if (dd->ipath_flags & IPATH_INITTED) {
+ ipath_sma_inuse = 1;
+ *dd->ipath_statusp |= IPATH_STATUS_SMA;
+ *dd->ipath_statusp &= ~IPATH_STATUS_OIB_SMA;
+ }
+ }
+ if (ipath_sma_inuse)
+ ret = 0;
+ else
+ ret = -ENODEV;
+bail:
+ spin_unlock(&ipath_devs_lock);
+ spin_unlock_irqrestore(&ipath_sma_lock, flags);
+ return ret;
+}
+
+static int ipath_sma_release(struct inode *in, struct file *fp)
+{
+ struct ipath_devdata *dd;
+ unsigned long flags;
+
+ spin_lock_irqsave(&ipath_sma_lock, flags);
+ spin_lock(&ipath_devs_lock);
+
+ ipath_sma_inuse = 0;
+ ipath_cdbg(SMA, "Closing SMA device\n");
+ list_for_each_entry(dd, &ipath_dev_list, ipath_list) {
+ if (!(dd->ipath_flags & IPATH_INITTED))
+ continue;
+ *dd->ipath_statusp &= ~IPATH_STATUS_SMA;
+ if (ipath_verbs_registered)
+ *dd->ipath_statusp |= IPATH_STATUS_OIB_SMA;
+ }
+ spin_unlock(&ipath_devs_lock);
+ spin_unlock_irqrestore(&ipath_sma_lock, flags);
+ return 0;
+}
+
+/**
+ * ipath_sma_read - receive an IB packet with QP 0 or 1
+ * @fp: the SMA device file pointer
+ * @data: ipath_sma_pkt structure saying where to place the SMA data
+ * @count: unused by this code
+ * @off: unused by this code
+ *
+ * This receives from all/any of the active chips, and we currently do not
+ * allow specifying just one (we could, by filling in unit in the library
+ * before the syscall, and checking here).
+ */
+static ssize_t ipath_sma_read(struct file *fp, char __user *data,
+ size_t count, loff_t *off)
+{
+ struct _ipath_sma_rpkt *smpkt;
+ struct ipath_devdata *dd;
+ struct ipath_sma_pkt rp;
+ unsigned long flags;
+ ssize_t ret;
+ u32 rp_len;
+ u8 *sdata;
+ u32 slen;
+ int any;
+
+ if (copy_from_user(&rp, data, sizeof(rp))) {
+ ret = -EFAULT;
+ goto bail;
+ }
+
+ if (!ipath_sma_data_spare) {
+ ipath_dbg("can't do receive, sma not initialized\n");
+ ret = -ENETDOWN;
+ goto bail;
+ }
+
+ spin_lock_irqsave(&ipath_devs_lock, flags);
+
+ any = 0;
+ list_for_each_entry(dd, &ipath_dev_list, ipath_list) {
+ if (dd->ipath_flags & IPATH_INITTED)
+ any++;
+ }
+
+ spin_unlock_irqrestore(&ipath_devs_lock, flags);
+
+ if (!any) { /* no hardware, freeze, etc. */
+ ipath_cdbg(SMA, "Didn't find any initialized and "
+ "usable chips\n");
+ ret = -ENODEV;
+ goto bail;
+ }
+
+ wait_event_interruptible(ipath_sma_wait,
+ ipath_sma_data[ipath_sma_first].len);
+
+ spin_lock_irqsave(&ipath_sma_lock, flags);
+ if (ipath_sma_data[ipath_sma_first].len == 0) {
+ /* usually means SMA process received a signal */
+ spin_unlock_irqrestore(&ipath_sma_lock, flags);
+ ret = -EAGAIN;
+ goto bail;
+ }
+
+ smpkt = &ipath_sma_data[ipath_sma_first];
+
+ /*
+ * We swap out the buffer we are going to use with the spare buffer
+ * and set spare to that buffer. This code is the only code that
+ * ever manipulates spare, other than the initialization code. This
+ * code should never be entered by more than one process at a time,
+ * and if it is, the user code doing so deserves what it gets; it
+ * won't break anything in the driver by doing so. We do it this
+ * way to avoid holding a lock across the copy_to_user, which could
+ * fault, or delay a long time while paging occurs; ditto for
+ * printks
+ */
+
+ rp_len = rp.len;
+ rp.len = smpkt->len;
+ rp.unit = smpkt->unit;
+
+ slen = smpkt->len;
+ sdata = smpkt->buf;
+ smpkt->buf = ipath_sma_data_spare;
+ ipath_sma_data_spare = sdata;
+ smpkt->len = 0; /* it's available again */
+ if (++ipath_sma_first >= IPATH_NUM_SMA_PKTS)
+ ipath_sma_first = 0;
+ spin_unlock_irqrestore(&ipath_sma_lock, flags);
+
+ if (copy_to_user((void __user *) (unsigned long) rp.data,
+ sdata, min(rp_len, slen))) {
+ ret = -EFAULT;
+ goto bail;
+ }
+
+ if (copy_to_user(data, &rp, sizeof(rp))) {
+ ret = -EFAULT;
+ goto bail;
+ }
+
+ ret = sizeof(rp);
+bail:
+ return ret;
+}
+
+/**
+ * ipath_sma_write - receive an IB packet with QP 0 or 1
+ * @fp: the SMA device file pointer
+ * @data: ipath_sma_pkt structure saying where to get the SMA packet
+ * @count: size of data to write
+ * @off: unused by this code
+ *
+ * This routine is no longer on any critical paths; it is used only
+ * for sending SMA packets, and some diagnostic usage.
+ * Because it's currently sma only, there are no checks to see if the
+ * link is up; sma must be able to send in the not fully initialized state
+ */
+static ssize_t ipath_sma_write(struct file *fp, const char __user *data,
+ size_t count, loff_t *off)
+{
+ u32 __iomem *piobuf;
+ u32 plen, clen, pbufn;
+ struct ipath_sma_pkt sp;
+ u32 *tmpbuf = NULL;
+ struct ipath_devdata *dd;
+ ssize_t ret = 0;
+ u64 val;
+
+ if (count < sizeof(sp)) {
+ ret = -EINVAL;
+ goto bail;
+ }
+
+ if (copy_from_user(&sp, data, sizeof(sp))) {
+ ret = -EFAULT;
+ goto bail;
+ }
+
+ // send count must be an exact number of dwords
+ if (sp.len & 3) {
+ ret = -EINVAL;
+ goto bail;
+ }
+
+ clen = sp.len >> 2;
+
+ dd = ipath_lookup(sp.unit);
+ if (!dd || !(dd->ipath_flags & IPATH_PRESENT) ||
+ !dd->ipath_kregbase) {
+ ipath_cdbg(SMA, "illegal unit %u for sma send\n", sp.unit);
+ ret = -ENODEV;
+ goto bail;
+ }
+
+ if (ipath_diag_inuse)
+ ipath_diag_bringup_link(dd);
+
+ if (!(dd->ipath_flags & IPATH_INITTED)) {
+ /* no hardware, freeze, etc. */
+ ipath_cdbg(SMA, "unit %u not usable\n", dd->ipath_unit);
+ ret = -ENODEV;
+ goto bail;
+ }
+ val = dd->ipath_lastibcstat & IPATH_IBSTATE_MASK;
+ if (val != IPATH_IBSTATE_INIT && val != IPATH_IBSTATE_ARM &&
+ val != IPATH_IBSTATE_ACTIVE) {
+ ipath_cdbg(SMA, "unit %u not ready (state %llx)\n",
+ dd->ipath_unit, (unsigned long long) val);
+ ret = -EINVAL;
+ goto bail;
+ }
+
+ /* need total length before first word written */
+ /* +1 word is for the qword padding */
+ plen = sizeof(u32) + sp.len;
+
+ if ((plen + 4) > dd->ipath_ibmaxlen) {
+ ipath_dbg("Pkt len 0x%x > ibmaxlen %x\n",
+ plen - 4, dd->ipath_ibmaxlen);
+ ret = -EINVAL;
+ goto bail; /* before writing pbc */
+ }
+ tmpbuf = vmalloc(plen);
+ if (!tmpbuf) {
+ dev_info(&dd->pcidev->dev, "Unable to allocate tmp buffer, "
+ "failing\n");
+ ret = -ENOMEM;
+ goto bail;
+ }
+
+ if (copy_from_user(tmpbuf,
+ (const void __user *) (unsigned long) sp.data,
+ sp.len)) {
+ ret = -EFAULT;
+ goto bail;
+ }
+
+ piobuf = ipath_getpiobuf(dd, &pbufn);
+ if (!piobuf) {
+ ipath_cdbg(SMA, "No PIO buffers avail unit %u %u times\n",
+ dd->ipath_unit, dd->ipath_nosma_bufs);
+ dd->ipath_nosma_bufs++;
+ ret = -EBUSY;
+ goto bail;
+ }
+ if (dd->ipath_nosma_bufs) {
+ ipath_cdbg(SMA, "Unit %u got SMA send buffer after %u "
+ "failures, %u seconds\n",
+ dd->ipath_unit, dd->ipath_nosma_bufs,
+ dd->ipath_nosma_secs);
+ dd->ipath_nosma_bufs = 0;
+ dd->ipath_nosma_secs = 0;
+ }
+
+ plen >>= 2; /* in dwords */
+
+ if (ipath_debug & __IPATH_PKTDBG) // SMA and PKT, both
+ ipath_cdbg(SMA, "unit %u 0x%x+1w pio%d\n",
+ dd->ipath_unit, plen - 1, pbufn);
+
+ /* we have to flush after the PBC for correctness on some cpus
+ * or WC buffer can be written out of order */
+ writeq(plen, piobuf);
+ ipath_flush_wc();
+ /* copy all by the trigger word, then flush, so it's written
+ * to chip before trigger word, then write trigger word, then
+ * flush again, so packet is sent. */
+ __iowrite32_copy(piobuf + 2, tmpbuf, clen - 1);
+ ipath_flush_wc();
+ __raw_writel(tmpbuf[clen - 1], piobuf + clen + 1);
+ ipath_flush_wc();
+ ipath_stats.sps_sma_spkts++;
+
+ ret = sizeof(sp);
+
+bail:
+ vfree(tmpbuf);
+ return ret;
+}
-
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