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);
+}