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:
Bryan O'Sullivan 2006-08-25 11:24:36 -07:00 committed by Roland Dreier
parent 32c0a26c8f
commit 98341f2618
4 changed files with 176 additions and 0 deletions

View file

@ -463,6 +463,13 @@ struct __ipath_sendpkt {
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;
};
/*
* Data layout in I2C flash (for GUID, etc.)
* All fields are little-endian binary unless otherwise stated

View file

@ -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);

View file

@ -1881,8 +1881,18 @@ 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(void)
struct ipath_devdata *dd, *tmp;
unsigned long flags;
ipath_diagpkt_remove();
ipath_exit_ipathfs();
ipath_driver_remove_group(&ipath_driver.driver);

View file

@ -789,6 +789,9 @@ int ipath_device_create_group(struct device *, struct ipath_devdata *);
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