/*
- * Copyright (c) 2006 QLogic, Inc. All rights reserved.
+ * Copyright (c) 2006, 2007, 2008 QLogic Corporation. All rights reserved.
* Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved.
*
* This software is available to you under a choice of one of two
* through the /sys/bus/pci resource mmap interface.
*/
+#include <linux/io.h>
#include <linux/pci.h>
+#include <linux/vmalloc.h>
+#include <linux/fs.h>
#include <asm/uaccess.h>
#include "ipath_kernel.h"
-#include "ipath_layer.h"
#include "ipath_common.h"
int ipath_diag_inuse;
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 = {
+static const struct file_operations diag_file_ops = {
.owner = THIS_MODULE,
.write = ipath_diag_write,
.read = ipath_diag_read,
.release = ipath_diag_release
};
+static ssize_t ipath_diagpkt_write(struct file *fp,
+ const char __user *data,
+ size_t count, loff_t *off);
+
+static const struct file_operations diagpkt_file_ops = {
+ .owner = THIS_MODULE,
+ .write = ipath_diagpkt_write,
+};
+
+static atomic_t diagpkt_count = ATOMIC_INIT(0);
+static struct cdev *diagpkt_cdev;
+static struct class_device *diagpkt_class_dev;
+
int ipath_diag_add(struct ipath_devdata *dd)
{
char name[16];
+ int ret = 0;
+
+ if (atomic_inc_return(&diagpkt_count) == 1) {
+ ret = ipath_cdev_init(IPATH_DIAGPKT_MINOR,
+ "ipath_diagpkt", &diagpkt_file_ops,
+ &diagpkt_cdev, &diagpkt_class_dev);
+
+ if (ret) {
+ ipath_dev_err(dd, "Couldn't create ipath_diagpkt "
+ "device: %d", ret);
+ goto done;
+ }
+ }
snprintf(name, sizeof(name), "ipath_diag%d", dd->ipath_unit);
- return ipath_cdev_init(IPATH_DIAG_MINOR_BASE + dd->ipath_unit, name,
- &diag_file_ops, &dd->diag_cdev,
- &dd->diag_class_dev);
+ ret = ipath_cdev_init(IPATH_DIAG_MINOR_BASE + dd->ipath_unit, name,
+ &diag_file_ops, &dd->diag_cdev,
+ &dd->diag_class_dev);
+ if (ret)
+ ipath_dev_err(dd, "Couldn't create %s device: %d",
+ name, ret);
+
+done:
+ return ret;
}
void ipath_diag_remove(struct ipath_devdata *dd)
{
+ if (atomic_dec_and_test(&diagpkt_count))
+ ipath_cdev_cleanup(&diagpkt_cdev, &diagpkt_class_dev);
+
ipath_cdev_cleanup(&dd->diag_cdev, &dd->diag_class_dev);
}
}
fp->private_data = dd;
- ipath_diag_inuse = 1;
+ ipath_diag_inuse = -2;
diag_set_link = 0;
ret = 0;
return ret;
}
+/**
+ * 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 odp;
+ struct ipath_diag_xpkt dp;
+ u32 *tmpbuf = NULL;
+ struct ipath_devdata *dd;
+ ssize_t ret = 0;
+ u64 val;
+ u32 l_state, lt_state; /* LinkState, LinkTrainingState */
+
+ if (count < sizeof(odp)) {
+ ret = -EINVAL;
+ goto bail;
+ }
+
+ if (count == sizeof(dp)) {
+ if (copy_from_user(&dp, data, sizeof(dp))) {
+ ret = -EFAULT;
+ goto bail;
+ }
+ } else if (copy_from_user(&odp, data, sizeof(odp))) {
+ ret = -EFAULT;
+ goto bail;
+ }
+
+ /*
+ * Due to padding/alignment issues (lessened with new struct)
+ * the old and new structs are the same length. We need to
+ * disambiguate them, which we can do because odp.len has never
+ * been less than the total of LRH+BTH+DETH so far, while
+ * dp.unit (same offset) unit is unlikely to get that high.
+ * Similarly, dp.data, the pointer to user at the same offset
+ * as odp.unit, is almost certainly at least one (512byte)page
+ * "above" NULL. The if-block below can be omitted if compatibility
+ * between a new driver and older diagnostic code is unimportant.
+ * compatibility the other direction (new diags, old driver) is
+ * handled in the diagnostic code, with a warning.
+ */
+ if (dp.unit >= 20 && dp.data < 512) {
+ /* very probable version mismatch. Fix it up */
+ memcpy(&odp, &dp, sizeof(odp));
+ /* We got a legacy dp, copy elements to dp */
+ dp.unit = odp.unit;
+ dp.data = odp.data;
+ dp.len = odp.len;
+ dp.pbc_wd = 0; /* Indicate we need to compute PBC wd */
+ }
+
+ /* 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;
+ }
+ /*
+ * Want to skip check for l_state if using custom PBC,
+ * because we might be trying to force an SM packet out.
+ * first-cut, skip _all_ state checking in that case.
+ */
+ val = ipath_ib_state(dd, dd->ipath_lastibcstat);
+ lt_state = ipath_ib_linktrstate(dd, dd->ipath_lastibcstat);
+ l_state = ipath_ib_linkstate(dd, dd->ipath_lastibcstat);
+ if (!dp.pbc_wd && (lt_state != INFINIPATH_IBCS_LT_STATE_LINKUP ||
+ (val != dd->ib_init && val != dd->ib_arm &&
+ val != dd->ib_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;
+ }
+
+ plen >>= 2; /* in dwords */
+
+ piobuf = ipath_getpiobuf(dd, plen, &pbufn);
+ if (!piobuf) {
+ ipath_cdbg(VERBOSE, "No PIO buffers avail unit for %u\n",
+ dd->ipath_unit);
+ ret = -EBUSY;
+ goto bail;
+ }
+ /* disarm it just to be extra sure */
+ ipath_disarm_piobufs(dd, pbufn, 1);
+
+ if (ipath_debug & __IPATH_PKTDBG)
+ ipath_cdbg(VERBOSE, "unit %u 0x%x+1w pio%d\n",
+ dd->ipath_unit, plen - 1, pbufn);
+
+ if (dp.pbc_wd == 0)
+ dp.pbc_wd = plen;
+ writeq(dp.pbc_wd, piobuf);
+ /*
+ * 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.
+ */
+ if (dd->ipath_flags & IPATH_PIO_FLUSH_WC) {
+ ipath_flush_wc();
+ __iowrite32_copy(piobuf + 2, tmpbuf, clen - 1);
+ ipath_flush_wc();
+ __raw_writel(tmpbuf[clen - 1], piobuf + clen + 1);
+ } else
+ __iowrite32_copy(piobuf + 2, tmpbuf, clen);
+
+ 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);
else if ((count % 4) || (*off % 4))
/* address or length is not 32-bit aligned, hence invalid */
ret = -EINVAL;
+ else if (ipath_diag_inuse < 1 && (*off || count != 8))
+ ret = -EINVAL; /* prevent cat /dev/ipath_diag* */
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);
if (ret >= 0) {
*off += count;
ret = count;
+ if (ipath_diag_inuse == -2)
+ ipath_diag_inuse++;
}
return ret;
else if ((count % 4) || (*off % 4))
/* address or length is not 32-bit aligned, hence invalid */
ret = -EINVAL;
+ else if ((ipath_diag_inuse == -1 && (*off || count != 8)) ||
+ ipath_diag_inuse == -2) /* read qw off 0, write qw off 0 */
+ ret = -EINVAL; /* before any other write allowed */
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);
if (ret >= 0) {
*off += count;
ret = count;
+ if (ipath_diag_inuse == -1)
+ ipath_diag_inuse = 1; /* all read/write OK now */
}
return ret;
projects / linux-2.6-omap-h63xx.git / blobdiff