linux/drivers/infiniband/hw/ipath/ipath_diag.c
Ralph Campbell 210d6ca3db IB/ipath: Performance optimization for CPU differences
Different processors have different ordering restrictions for write
combining.  By taking advantage of this, we can eliminate some write
barriers when writing to the send buffers.

Signed-off-by: Ralph Campbell <ralph.campbell@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
2007-10-09 20:04:14 -07:00

546 lines
15 KiB
C

/*
* Copyright (c) 2006, 2007 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
* 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/io.h>
#include <linux/pci.h>
#include <linux/vmalloc.h>
#include <linux/fs.h>
#include <asm/uaccess.h>
#include "ipath_kernel.h"
#include "ipath_common.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 const 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 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);
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);
}
/**
* 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 += sizeof(u64);
}
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 += sizeof(u64);
}
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 += sizeof(u32);
}
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 += sizeof(u32);
}
ret = 0;
bail:
return ret;
}
static int ipath_diag_open(struct inode *in, struct file *fp)
{
int unit = iminor(in) - IPATH_DIAG_MINOR_BASE;
struct ipath_devdata *dd;
int ret;
mutex_lock(&ipath_mutex);
if (ipath_diag_inuse) {
ret = -EBUSY;
goto bail;
}
dd = ipath_lookup(unit);
if (dd == NULL || !(dd->ipath_flags & IPATH_PRESENT) ||
!dd->ipath_kregbase) {
ret = -ENODEV;
goto bail;
}
fp->private_data = dd;
ipath_diag_inuse = -2;
diag_set_link = 0;
ret = 0;
/* Only expose a way to reset the device if we
make it into diag mode. */
ipath_expose_reset(&dd->pcidev->dev);
bail:
mutex_unlock(&ipath_mutex);
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;
if (count != sizeof(dp)) {
ret = -EINVAL;
goto bail;
}
if (copy_from_user(&dp, data, sizeof(dp))) {
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;
}
/* Check link state, but not if we have custom PBC */
val = dd->ipath_lastibcstat & IPATH_IBSTATE_MASK;
if (!dp.pbc_wd && 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);
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);
ipath_diag_inuse = 0;
fp->private_data = NULL;
mutex_unlock(&ipath_mutex);
return 0;
}
static ssize_t ipath_diag_read(struct file *fp, char __user *data,
size_t count, loff_t *off)
{
struct ipath_devdata *dd = fp->private_data;
void __iomem *kreg_base;
ssize_t ret;
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 (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);
else
ret = ipath_read_umem64(dd, data, kreg_base + *off, count);
if (ret >= 0) {
*off += count;
ret = count;
if (ipath_diag_inuse == -2)
ipath_diag_inuse++;
}
return ret;
}
static ssize_t ipath_diag_write(struct file *fp, const char __user *data,
size_t count, loff_t *off)
{
struct ipath_devdata *dd = fp->private_data;
void __iomem *kreg_base;
ssize_t ret;
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 ((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);
else
ret = ipath_write_umem64(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;
}