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Diffstat (limited to 'drivers/infiniband/hw/ipath/ipath_fs.c')
-rw-r--r--drivers/infiniband/hw/ipath/ipath_fs.c605
1 files changed, 605 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/ipath/ipath_fs.c b/drivers/infiniband/hw/ipath/ipath_fs.c
new file mode 100644
index 000000000000..e274120567e1
--- /dev/null
+++ b/drivers/infiniband/hw/ipath/ipath_fs.c
@@ -0,0 +1,605 @@
+/*
+ * 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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