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Message-Id: <8743e6ee09c51e799f0f.1156530276@eng-12.pathscale.com>
Date: Fri, 25 Aug 2006 11:24:36 -0700
From: Bryan O'Sullivan <bos@...hscale.com>
To: rdreier@...co.com
Cc: openib-general@...nib.org, linux-kernel@...r.kernel.org
Subject: [PATCH 11 of 23] IB/ipath - add new minor device to allow sending of
diag packets
Signed-off-by: Bryan O'Sullivan <bryan.osullivan@...gic.com>
diff --git a/drivers/infiniband/hw/ipath/ipath_common.h b/drivers/infiniband/hw/ipath/ipath_common.h
--- a/drivers/infiniband/hw/ipath/ipath_common.h Fri Aug 25 11:19:45 2006 -0700
+++ b/drivers/infiniband/hw/ipath/ipath_common.h Fri Aug 25 11:19:45 2006 -0700
@@ -461,6 +461,13 @@ struct __ipath_sendpkt {
__u32 sps_cnt; /* number of entries to use in sps_iov */
/* array of iov's describing packet. TEMPORARY */
struct ipath_iovec sps_iov[4];
+};
+
+/* Passed into diag data special file's ->write method. */
+struct ipath_diag_pkt {
+ __u32 unit;
+ __u64 data;
+ __u32 len;
};
/*
diff --git a/drivers/infiniband/hw/ipath/ipath_diag.c b/drivers/infiniband/hw/ipath/ipath_diag.c
--- a/drivers/infiniband/hw/ipath/ipath_diag.c Fri Aug 25 11:19:45 2006 -0700
+++ b/drivers/infiniband/hw/ipath/ipath_diag.c Fri Aug 25 11:19:45 2006 -0700
@@ -41,6 +41,7 @@
* through the /sys/bus/pci resource mmap interface.
*/
+#include <linux/io.h>
#include <linux/pci.h>
#include <asm/uaccess.h>
@@ -273,6 +274,158 @@ bail:
return ret;
}
+static ssize_t ipath_diagpkt_write(struct file *fp,
+ const char __user *data,
+ size_t count, loff_t *off);
+
+static struct file_operations diagpkt_file_ops = {
+ .owner = THIS_MODULE,
+ .write = ipath_diagpkt_write,
+};
+
+static struct cdev *diagpkt_cdev;
+static struct class_device *diagpkt_class_dev;
+
+int __init ipath_diagpkt_add(void)
+{
+ return ipath_cdev_init(IPATH_DIAGPKT_MINOR,
+ "ipath_diagpkt", &diagpkt_file_ops,
+ &diagpkt_cdev, &diagpkt_class_dev);
+}
+
+void __exit ipath_diagpkt_remove(void)
+{
+ ipath_cdev_cleanup(&diagpkt_cdev, &diagpkt_class_dev);
+}
+
+/**
+ * ipath_diagpkt_write - write an IB packet
+ * @fp: the diag data device file pointer
+ * @data: ipath_diag_pkt structure saying where to get the packet
+ * @count: size of data to write
+ * @off: unused by this code
+ */
+static ssize_t ipath_diagpkt_write(struct file *fp,
+ const char __user *data,
+ size_t count, loff_t *off)
+{
+ u32 __iomem *piobuf;
+ u32 plen, clen, pbufn;
+ struct ipath_diag_pkt dp;
+ u32 *tmpbuf = NULL;
+ struct ipath_devdata *dd;
+ ssize_t ret = 0;
+ u64 val;
+
+ if (count < sizeof(dp)) {
+ ret = -EINVAL;
+ goto bail;
+ }
+
+ if (copy_from_user(&dp, data, sizeof(dp))) {
+ ret = -EFAULT;
+ goto bail;
+ }
+
+ /* send count must be an exact number of dwords */
+ if (dp.len & 3) {
+ ret = -EINVAL;
+ goto bail;
+ }
+
+ clen = dp.len >> 2;
+
+ dd = ipath_lookup(dp.unit);
+ if (!dd || !(dd->ipath_flags & IPATH_PRESENT) ||
+ !dd->ipath_kregbase) {
+ ipath_cdbg(VERBOSE, "illegal unit %u for diag data send\n",
+ dp.unit);
+ ret = -ENODEV;
+ goto bail;
+ }
+
+ if (ipath_diag_inuse && !diag_set_link &&
+ !(dd->ipath_flags & IPATH_LINKACTIVE)) {
+ diag_set_link = 1;
+ ipath_cdbg(VERBOSE, "Trying to set to set link active for "
+ "diag pkt\n");
+ ipath_set_linkstate(dd, IPATH_IB_LINKARM);
+ ipath_set_linkstate(dd, IPATH_IB_LINKACTIVE);
+ }
+
+ if (!(dd->ipath_flags & IPATH_INITTED)) {
+ /* no hardware, freeze, etc. */
+ ipath_cdbg(VERBOSE, "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(VERBOSE, "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) + dp.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) dp.data,
+ dp.len)) {
+ ret = -EFAULT;
+ goto bail;
+ }
+
+ piobuf = ipath_getpiobuf(dd, &pbufn);
+ if (!piobuf) {
+ ipath_cdbg(VERBOSE, "No PIO buffers avail unit for %u\n",
+ dd->ipath_unit);
+ ret = -EBUSY;
+ goto bail;
+ }
+
+ plen >>= 2; /* in dwords */
+
+ if (ipath_debug & __IPATH_PKTDBG)
+ ipath_cdbg(VERBOSE, "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();
+
+ ret = sizeof(dp);
+
+bail:
+ vfree(tmpbuf);
+ return ret;
+}
+
static int ipath_diag_release(struct inode *in, struct file *fp)
{
mutex_lock(&ipath_mutex);
diff --git a/drivers/infiniband/hw/ipath/ipath_driver.c b/drivers/infiniband/hw/ipath/ipath_driver.c
--- a/drivers/infiniband/hw/ipath/ipath_driver.c Fri Aug 25 11:19:45 2006 -0700
+++ b/drivers/infiniband/hw/ipath/ipath_driver.c Fri Aug 25 11:19:45 2006 -0700
@@ -1881,7 +1881,17 @@ static int __init infinipath_init(void)
goto bail_group;
}
+ ret = ipath_diagpkt_add();
+ if (ret < 0) {
+ printk(KERN_ERR IPATH_DRV_NAME ": Unable to create "
+ "diag data device: error %d\n", -ret);
+ goto bail_ipathfs;
+ }
+
goto bail;
+
+bail_ipathfs:
+ ipath_exit_ipathfs();
bail_group:
ipath_driver_remove_group(&ipath_driver.driver);
@@ -1993,6 +2003,8 @@ static void __exit infinipath_cleanup(vo
struct ipath_devdata *dd, *tmp;
unsigned long flags;
+ ipath_diagpkt_remove();
+
ipath_exit_ipathfs();
ipath_driver_remove_group(&ipath_driver.driver);
diff --git a/drivers/infiniband/hw/ipath/ipath_kernel.h b/drivers/infiniband/hw/ipath/ipath_kernel.h
--- a/drivers/infiniband/hw/ipath/ipath_kernel.h Fri Aug 25 11:19:45 2006 -0700
+++ b/drivers/infiniband/hw/ipath/ipath_kernel.h Fri Aug 25 11:19:45 2006 -0700
@@ -789,6 +789,9 @@ void ipath_device_remove_group(struct de
void ipath_device_remove_group(struct device *, struct ipath_devdata *);
int ipath_expose_reset(struct device *);
+int ipath_diagpkt_add(void);
+void ipath_diagpkt_remove(void);
+
int ipath_init_ipathfs(void);
void ipath_exit_ipathfs(void);
int ipathfs_add_device(struct ipath_devdata *);
@@ -813,6 +816,7 @@ extern struct mutex ipath_mutex;
#define IPATH_DRV_NAME "ib_ipath"
#define IPATH_MAJOR 233
#define IPATH_USER_MINOR_BASE 0
+#define IPATH_DIAGPKT_MINOR 127
#define IPATH_DIAG_MINOR_BASE 129
#define IPATH_NMINORS 255
-
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