Commit 3e9b4a5e authored by Bryan O'Sullivan's avatar Bryan O'Sullivan Committed by Roland Dreier
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IB/ipath: sysfs and ipathfs support for core driver



The ipathfs filesystem contains files that are not appropriate for
sysfs, because they contain binary data.  The hierarchy is simple; the
top-level directory contains driver-wide attribute files, while numbered
subdirectories contain per-device attribute files.

Our userspace code currently expects this filesystem to be mounted on
/ipathfs, but a final location has not yet been chosen.
Signed-off-by: default avatarBryan O'Sullivan <bos@pathscale.com>
Signed-off-by: default avatarRoland Dreier <rolandd@cisco.com>
parent 108ecf0d
/*
* Copyright (c) 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.
*/
#include <linux/version.h>
#include <linux/config.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/mount.h>
#include <linux/pagemap.h>
#include <linux/init.h>
#include <linux/namei.h>
#include <linux/pci.h>
#include "ipath_kernel.h"
#define IPATHFS_MAGIC 0x726a77
static struct super_block *ipath_super;
static int ipathfs_mknod(struct inode *dir, struct dentry *dentry,
int mode, struct file_operations *fops,
void *data)
{
int error;
struct inode *inode = new_inode(dir->i_sb);
if (!inode) {
error = -EPERM;
goto bail;
}
inode->i_mode = mode;
inode->i_uid = 0;
inode->i_gid = 0;
inode->i_blksize = PAGE_CACHE_SIZE;
inode->i_blocks = 0;
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
inode->u.generic_ip = data;
if ((mode & S_IFMT) == S_IFDIR) {
inode->i_op = &simple_dir_inode_operations;
inode->i_nlink++;
dir->i_nlink++;
}
inode->i_fop = fops;
d_instantiate(dentry, inode);
error = 0;
bail:
return error;
}
static int create_file(const char *name, mode_t mode,
struct dentry *parent, struct dentry **dentry,
struct file_operations *fops, void *data)
{
int error;
*dentry = NULL;
mutex_lock(&parent->d_inode->i_mutex);
*dentry = lookup_one_len(name, parent, strlen(name));
if (!IS_ERR(dentry))
error = ipathfs_mknod(parent->d_inode, *dentry,
mode, fops, data);
else
error = PTR_ERR(dentry);
mutex_unlock(&parent->d_inode->i_mutex);
return error;
}
static ssize_t atomic_stats_read(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
return simple_read_from_buffer(buf, count, ppos, &ipath_stats,
sizeof ipath_stats);
}
static struct file_operations atomic_stats_ops = {
.read = atomic_stats_read,
};
#define NUM_COUNTERS sizeof(struct infinipath_counters) / sizeof(u64)
static ssize_t atomic_counters_read(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
u64 counters[NUM_COUNTERS];
u16 i;
struct ipath_devdata *dd;
dd = file->f_dentry->d_inode->u.generic_ip;
for (i = 0; i < NUM_COUNTERS; i++)
counters[i] = ipath_snap_cntr(dd, i);
return simple_read_from_buffer(buf, count, ppos, counters,
sizeof counters);
}
static struct file_operations atomic_counters_ops = {
.read = atomic_counters_read,
};
static ssize_t atomic_node_info_read(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
u32 nodeinfo[10];
struct ipath_devdata *dd;
u64 guid;
dd = file->f_dentry->d_inode->u.generic_ip;
guid = be64_to_cpu(dd->ipath_guid);
nodeinfo[0] = /* BaseVersion is SMA */
/* ClassVersion is SMA */
(1 << 8) /* NodeType */
| (1 << 0); /* NumPorts */
nodeinfo[1] = (u32) (guid >> 32);
nodeinfo[2] = (u32) (guid & 0xffffffff);
/* PortGUID == SystemImageGUID for us */
nodeinfo[3] = nodeinfo[1];
/* PortGUID == SystemImageGUID for us */
nodeinfo[4] = nodeinfo[2];
/* PortGUID == NodeGUID for us */
nodeinfo[5] = nodeinfo[3];
/* PortGUID == NodeGUID for us */
nodeinfo[6] = nodeinfo[4];
nodeinfo[7] = (4 << 16) /* we support 4 pkeys */
| (dd->ipath_deviceid << 0);
/* our chip version as 16 bits major, 16 bits minor */
nodeinfo[8] = dd->ipath_minrev | (dd->ipath_majrev << 16);
nodeinfo[9] = (dd->ipath_unit << 24) | (dd->ipath_vendorid << 0);
return simple_read_from_buffer(buf, count, ppos, nodeinfo,
sizeof nodeinfo);
}
static struct file_operations atomic_node_info_ops = {
.read = atomic_node_info_read,
};
static ssize_t atomic_port_info_read(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
u32 portinfo[13];
u32 tmp, tmp2;
struct ipath_devdata *dd;
dd = file->f_dentry->d_inode->u.generic_ip;
/* so we only initialize non-zero fields. */
memset(portinfo, 0, sizeof portinfo);
/*
* Notimpl yet M_Key (64)
* Notimpl yet GID (64)
*/
portinfo[4] = (dd->ipath_lid << 16);
/*
* Notimpl yet SMLID (should we store this in the driver, in case
* SMA dies?) CapabilityMask is 0, we don't support any of these
* DiagCode is 0; we don't store any diag info for now Notimpl yet
* M_KeyLeasePeriod (we don't support M_Key)
*/
/* LocalPortNum is whichever port number they ask for */
portinfo[7] = (dd->ipath_unit << 24)
/* LinkWidthEnabled */
| (2 << 16)
/* LinkWidthSupported (really 2, but not IB valid) */
| (3 << 8)
/* LinkWidthActive */
| (2 << 0);
tmp = dd->ipath_lastibcstat & IPATH_IBSTATE_MASK;
tmp2 = 5;
if (tmp == IPATH_IBSTATE_INIT)
tmp = 2;
else if (tmp == IPATH_IBSTATE_ARM)
tmp = 3;
else if (tmp == IPATH_IBSTATE_ACTIVE)
tmp = 4;
else {
tmp = 0; /* down */
tmp2 = tmp & 0xf;
}
portinfo[8] = (1 << 28) /* LinkSpeedSupported */
| (tmp << 24) /* PortState */
| (tmp2 << 20) /* PortPhysicalState */
| (2 << 16)
/* LinkDownDefaultState */
/* M_KeyProtectBits == 0 */
/* NotImpl yet LMC == 0 (we can support all values) */
| (1 << 4) /* LinkSpeedActive */
| (1 << 0); /* LinkSpeedEnabled */
switch (dd->ipath_ibmtu) {
case 4096:
tmp = 5;
break;
case 2048:
tmp = 4;
break;
case 1024:
tmp = 3;
break;
case 512:
tmp = 2;
break;
case 256:
tmp = 1;
break;
default: /* oops, something is wrong */
ipath_dbg("Problem, ipath_ibmtu 0x%x not a valid IB MTU, "
"treat as 2048\n", dd->ipath_ibmtu);
tmp = 4;
break;
}
portinfo[9] = (tmp << 28)
/* NeighborMTU */
/* Notimpl MasterSMSL */
| (1 << 20)
/* VLCap */
/* Notimpl InitType (actually, an SMA decision) */
/* VLHighLimit is 0 (only one VL) */
; /* VLArbitrationHighCap is 0 (only one VL) */
portinfo[10] = /* VLArbitrationLowCap is 0 (only one VL) */
/* InitTypeReply is SMA decision */
(5 << 16) /* MTUCap 4096 */
| (7 << 13) /* VLStallCount */
| (0x1f << 8) /* HOQLife */
| (1 << 4)
/* OperationalVLs 0 */
/* PartitionEnforcementInbound */
/* PartitionEnforcementOutbound not enforced */
/* FilterRawinbound not enforced */
; /* FilterRawOutbound not enforced */
/* M_KeyViolations are not counted by hardware, SMA can count */
tmp = ipath_read_creg32(dd, dd->ipath_cregs->cr_errpkey);
/* P_KeyViolations are counted by hardware. */
portinfo[11] = ((tmp & 0xffff) << 0);
portinfo[12] =
/* Q_KeyViolations are not counted by hardware */
(1 << 8)
/* GUIDCap */
/* SubnetTimeOut handled by SMA */
/* RespTimeValue handled by SMA */
;
/* LocalPhyErrors are programmed to max */
portinfo[12] |= (0xf << 20)
| (0xf << 16) /* OverRunErrors are programmed to max */
;
return simple_read_from_buffer(buf, count, ppos, portinfo,
sizeof portinfo);
}
static struct file_operations atomic_port_info_ops = {
.read = atomic_port_info_read,
};
static ssize_t flash_read(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
struct ipath_devdata *dd;
ssize_t ret;
loff_t pos;
char *tmp;
pos = *ppos;
if ( pos < 0) {
ret = -EINVAL;
goto bail;
}
if (pos >= sizeof(struct ipath_flash)) {
ret = 0;
goto bail;
}
if (count > sizeof(struct ipath_flash) - pos)
count = sizeof(struct ipath_flash) - pos;
tmp = kmalloc(count, GFP_KERNEL);
if (!tmp) {
ret = -ENOMEM;
goto bail;
}
dd = file->f_dentry->d_inode->u.generic_ip;
if (ipath_eeprom_read(dd, pos, tmp, count)) {
ipath_dev_err(dd, "failed to read from flash\n");
ret = -ENXIO;
goto bail_tmp;
}
if (copy_to_user(buf, tmp, count)) {
ret = -EFAULT;
goto bail_tmp;
}
*ppos = pos + count;
ret = count;
bail_tmp:
kfree(tmp);
bail:
return ret;
}
static ssize_t flash_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
struct ipath_devdata *dd;
ssize_t ret;
loff_t pos;
char *tmp;
pos = *ppos;
if ( pos < 0) {
ret = -EINVAL;
goto bail;
}
if (pos >= sizeof(struct ipath_flash)) {
ret = 0;
goto bail;
}
if (count > sizeof(struct ipath_flash) - pos)
count = sizeof(struct ipath_flash) - pos;
tmp = kmalloc(count, GFP_KERNEL);
if (!tmp) {
ret = -ENOMEM;
goto bail;
}
if (copy_from_user(tmp, buf, count)) {
ret = -EFAULT;
goto bail_tmp;
}
dd = file->f_dentry->d_inode->u.generic_ip;
if (ipath_eeprom_write(dd, pos, tmp, count)) {
ret = -ENXIO;
ipath_dev_err(dd, "failed to write to flash\n");
goto bail_tmp;
}
*ppos = pos + count;
ret = count;
bail_tmp:
kfree(tmp);
bail:
return ret;
}
static struct file_operations flash_ops = {
.read = flash_read,
.write = flash_write,
};
static int create_device_files(struct super_block *sb,
struct ipath_devdata *dd)
{
struct dentry *dir, *tmp;
char unit[10];
int ret;
snprintf(unit, sizeof unit, "%02d", dd->ipath_unit);
ret = create_file(unit, S_IFDIR|S_IRUGO|S_IXUGO, sb->s_root, &dir,
(struct file_operations *) &simple_dir_operations,
dd);
if (ret) {
printk(KERN_ERR "create_file(%s) failed: %d\n", unit, ret);
goto bail;
}
ret = create_file("atomic_counters", S_IFREG|S_IRUGO, dir, &tmp,
&atomic_counters_ops, dd);
if (ret) {
printk(KERN_ERR "create_file(%s/atomic_counters) "
"failed: %d\n", unit, ret);
goto bail;
}
ret = create_file("node_info", S_IFREG|S_IRUGO, dir, &tmp,
&atomic_node_info_ops, dd);
if (ret) {
printk(KERN_ERR "create_file(%s/node_info) "
"failed: %d\n", unit, ret);
goto bail;
}
ret = create_file("port_info", S_IFREG|S_IRUGO, dir, &tmp,
&atomic_port_info_ops, dd);
if (ret) {
printk(KERN_ERR "create_file(%s/port_info) "
"failed: %d\n", unit, ret);
goto bail;
}
ret = create_file("flash", S_IFREG|S_IWUSR|S_IRUGO, dir, &tmp,
&flash_ops, dd);
if (ret) {
printk(KERN_ERR "create_file(%s/flash) "
"failed: %d\n", unit, ret);
goto bail;
}
bail:
return ret;
}
static void remove_file(struct dentry *parent, char *name)
{
struct dentry *tmp;
tmp = lookup_one_len(name, parent, strlen(name));
spin_lock(&dcache_lock);
spin_lock(&tmp->d_lock);
if (!(d_unhashed(tmp) && tmp->d_inode)) {
dget_locked(tmp);
__d_drop(tmp);
spin_unlock(&tmp->d_lock);
spin_unlock(&dcache_lock);
simple_unlink(parent->d_inode, tmp);
} else {
spin_unlock(&tmp->d_lock);
spin_unlock(&dcache_lock);
}
}
static int remove_device_files(struct super_block *sb,
struct ipath_devdata *dd)
{
struct dentry *dir, *root;
char unit[10];
int ret;
root = dget(sb->s_root);
mutex_lock(&root->d_inode->i_mutex);
snprintf(unit, sizeof unit, "%02d", dd->ipath_unit);
dir = lookup_one_len(unit, root, strlen(unit));
if (IS_ERR(dir)) {
ret = PTR_ERR(dir);
printk(KERN_ERR "Lookup of %s failed\n", unit);
goto bail;
}
remove_file(dir, "flash");
remove_file(dir, "port_info");
remove_file(dir, "node_info");
remove_file(dir, "atomic_counters");
d_delete(dir);
ret = simple_rmdir(root->d_inode, dir);
bail:
mutex_unlock(&root->d_inode->i_mutex);
dput(root);
return ret;
}
static int ipathfs_fill_super(struct super_block *sb, void *data,
int silent)
{
struct ipath_devdata *dd, *tmp;
unsigned long flags;
int ret;
static struct tree_descr files[] = {
[1] = {"atomic_stats", &atomic_stats_ops, S_IRUGO},
{""},
};
ret = simple_fill_super(sb, IPATHFS_MAGIC, files);
if (ret) {
printk(KERN_ERR "simple_fill_super failed: %d\n", ret);
goto bail;
}
spin_lock_irqsave(&ipath_devs_lock, flags);
list_for_each_entry_safe(dd, tmp, &ipath_dev_list, ipath_list) {
spin_unlock_irqrestore(&ipath_devs_lock, flags);
ret = create_device_files(sb, dd);
if (ret) {
deactivate_super(sb);
goto bail;
}
spin_lock_irqsave(&ipath_devs_lock, flags);
}
spin_unlock_irqrestore(&ipath_devs_lock, flags);
bail:
return ret;
}
static struct super_block *ipathfs_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name,
void *data)
{
ipath_super = get_sb_single(fs_type, flags, data,
ipathfs_fill_super);
return ipath_super;
}
static void ipathfs_kill_super(struct super_block *s)
{
kill_litter_super(s);
ipath_super = NULL;
}
int ipathfs_add_device(struct ipath_devdata *dd)
{
int ret;
if (ipath_super == NULL) {
ret = 0;
goto bail;
}
ret = create_device_files(ipath_super, dd);
bail:
return ret;
}
int ipathfs_remove_device(struct ipath_devdata *dd)
{
int ret;
if (ipath_super == NULL) {
ret = 0;
goto bail;
}
ret = remove_device_files(ipath_super, dd);
bail:
return ret;
}
static struct file_system_type ipathfs_fs_type = {
.owner = THIS_MODULE,
.name = "ipathfs",
.get_sb = ipathfs_get_sb,
.kill_sb = ipathfs_kill_super,
};
int __init ipath_init_ipathfs(void)
{
return register_filesystem(&ipathfs_fs_type);
}
void __exit ipath_exit_ipathfs(void)
{
unregister_filesystem(&ipathfs_fs_type);
}
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