forked from Minki/linux
IB/ipath: add new minor device to allow sending of diag packets
Signed-off-by: Bryan O'Sullivan <bryan.osullivan@qlogic.com> Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
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32c0a26c8f
commit
98341f2618
@ -463,6 +463,13 @@ struct __ipath_sendpkt {
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struct ipath_iovec sps_iov[4];
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};
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/* Passed into diag data special file's ->write method. */
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struct ipath_diag_pkt {
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__u32 unit;
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__u64 data;
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__u32 len;
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};
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/*
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* Data layout in I2C flash (for GUID, etc.)
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* All fields are little-endian binary unless otherwise stated
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@ -41,6 +41,7 @@
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* through the /sys/bus/pci resource mmap interface.
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*/
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#include <linux/io.h>
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#include <linux/pci.h>
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#include <asm/uaccess.h>
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@ -273,6 +274,158 @@ bail:
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return ret;
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}
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static ssize_t ipath_diagpkt_write(struct file *fp,
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const char __user *data,
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size_t count, loff_t *off);
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static struct file_operations diagpkt_file_ops = {
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.owner = THIS_MODULE,
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.write = ipath_diagpkt_write,
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};
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static struct cdev *diagpkt_cdev;
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static struct class_device *diagpkt_class_dev;
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int __init ipath_diagpkt_add(void)
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{
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return ipath_cdev_init(IPATH_DIAGPKT_MINOR,
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"ipath_diagpkt", &diagpkt_file_ops,
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&diagpkt_cdev, &diagpkt_class_dev);
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}
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void __exit ipath_diagpkt_remove(void)
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{
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ipath_cdev_cleanup(&diagpkt_cdev, &diagpkt_class_dev);
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}
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/**
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* ipath_diagpkt_write - write an IB packet
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* @fp: the diag data device file pointer
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* @data: ipath_diag_pkt structure saying where to get the packet
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* @count: size of data to write
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* @off: unused by this code
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*/
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static ssize_t ipath_diagpkt_write(struct file *fp,
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const char __user *data,
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size_t count, loff_t *off)
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{
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u32 __iomem *piobuf;
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u32 plen, clen, pbufn;
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struct ipath_diag_pkt dp;
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u32 *tmpbuf = NULL;
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struct ipath_devdata *dd;
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ssize_t ret = 0;
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u64 val;
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if (count < sizeof(dp)) {
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ret = -EINVAL;
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goto bail;
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}
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if (copy_from_user(&dp, data, sizeof(dp))) {
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ret = -EFAULT;
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goto bail;
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}
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/* send count must be an exact number of dwords */
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if (dp.len & 3) {
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ret = -EINVAL;
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goto bail;
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}
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clen = dp.len >> 2;
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dd = ipath_lookup(dp.unit);
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if (!dd || !(dd->ipath_flags & IPATH_PRESENT) ||
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!dd->ipath_kregbase) {
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ipath_cdbg(VERBOSE, "illegal unit %u for diag data send\n",
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dp.unit);
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ret = -ENODEV;
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goto bail;
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}
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if (ipath_diag_inuse && !diag_set_link &&
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!(dd->ipath_flags & IPATH_LINKACTIVE)) {
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diag_set_link = 1;
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ipath_cdbg(VERBOSE, "Trying to set to set link active for "
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"diag pkt\n");
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ipath_set_linkstate(dd, IPATH_IB_LINKARM);
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ipath_set_linkstate(dd, IPATH_IB_LINKACTIVE);
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}
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if (!(dd->ipath_flags & IPATH_INITTED)) {
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/* no hardware, freeze, etc. */
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ipath_cdbg(VERBOSE, "unit %u not usable\n", dd->ipath_unit);
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ret = -ENODEV;
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goto bail;
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}
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val = dd->ipath_lastibcstat & IPATH_IBSTATE_MASK;
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if (val != IPATH_IBSTATE_INIT && val != IPATH_IBSTATE_ARM &&
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val != IPATH_IBSTATE_ACTIVE) {
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ipath_cdbg(VERBOSE, "unit %u not ready (state %llx)\n",
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dd->ipath_unit, (unsigned long long) val);
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ret = -EINVAL;
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goto bail;
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}
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/* need total length before first word written */
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/* +1 word is for the qword padding */
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plen = sizeof(u32) + dp.len;
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if ((plen + 4) > dd->ipath_ibmaxlen) {
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ipath_dbg("Pkt len 0x%x > ibmaxlen %x\n",
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plen - 4, dd->ipath_ibmaxlen);
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ret = -EINVAL;
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goto bail; /* before writing pbc */
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}
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tmpbuf = vmalloc(plen);
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if (!tmpbuf) {
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dev_info(&dd->pcidev->dev, "Unable to allocate tmp buffer, "
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"failing\n");
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ret = -ENOMEM;
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goto bail;
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}
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if (copy_from_user(tmpbuf,
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(const void __user *) (unsigned long) dp.data,
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dp.len)) {
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ret = -EFAULT;
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goto bail;
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}
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piobuf = ipath_getpiobuf(dd, &pbufn);
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if (!piobuf) {
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ipath_cdbg(VERBOSE, "No PIO buffers avail unit for %u\n",
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dd->ipath_unit);
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ret = -EBUSY;
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goto bail;
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}
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plen >>= 2; /* in dwords */
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if (ipath_debug & __IPATH_PKTDBG)
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ipath_cdbg(VERBOSE, "unit %u 0x%x+1w pio%d\n",
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dd->ipath_unit, plen - 1, pbufn);
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/* we have to flush after the PBC for correctness on some cpus
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* or WC buffer can be written out of order */
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writeq(plen, piobuf);
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ipath_flush_wc();
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/* copy all by the trigger word, then flush, so it's written
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* to chip before trigger word, then write trigger word, then
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* flush again, so packet is sent. */
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__iowrite32_copy(piobuf + 2, tmpbuf, clen - 1);
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ipath_flush_wc();
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__raw_writel(tmpbuf[clen - 1], piobuf + clen + 1);
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ipath_flush_wc();
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ret = sizeof(dp);
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bail:
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vfree(tmpbuf);
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return ret;
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}
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static int ipath_diag_release(struct inode *in, struct file *fp)
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{
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mutex_lock(&ipath_mutex);
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@ -1881,8 +1881,18 @@ static int __init infinipath_init(void)
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goto bail_group;
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}
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ret = ipath_diagpkt_add();
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if (ret < 0) {
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printk(KERN_ERR IPATH_DRV_NAME ": Unable to create "
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"diag data device: error %d\n", -ret);
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goto bail_ipathfs;
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}
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goto bail;
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bail_ipathfs:
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ipath_exit_ipathfs();
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bail_group:
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ipath_driver_remove_group(&ipath_driver.driver);
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@ -1993,6 +2003,8 @@ static void __exit infinipath_cleanup(void)
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struct ipath_devdata *dd, *tmp;
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unsigned long flags;
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ipath_diagpkt_remove();
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ipath_exit_ipathfs();
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ipath_driver_remove_group(&ipath_driver.driver);
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@ -789,6 +789,9 @@ int ipath_device_create_group(struct device *, struct ipath_devdata *);
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void ipath_device_remove_group(struct device *, struct ipath_devdata *);
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int ipath_expose_reset(struct device *);
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int ipath_diagpkt_add(void);
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void ipath_diagpkt_remove(void);
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int ipath_init_ipathfs(void);
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void ipath_exit_ipathfs(void);
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int ipathfs_add_device(struct ipath_devdata *);
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@ -813,6 +816,7 @@ extern struct mutex ipath_mutex;
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#define IPATH_DRV_NAME "ib_ipath"
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#define IPATH_MAJOR 233
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#define IPATH_USER_MINOR_BASE 0
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#define IPATH_DIAGPKT_MINOR 127
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#define IPATH_DIAG_MINOR_BASE 129
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#define IPATH_NMINORS 255
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