forked from Minki/linux
mtip32xx: Create debugfs entries for troubleshooting
On module load, creates a debugfs parent 'rssd' in debugfs root. Then for each device, create a new node with corresponding disk name. Under the new node, two entries 'registers' and 'flags' are created. NOTE: These entries were removed from sysfs in the previous patch Signed-off-by: Asai Thambi S P <asamymuthupa@micron.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Asai Thambi S P
Jens Axboe
parent
7412ff139d
commit
7b421d24ea
@ -37,6 +37,7 @@
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#include <linux/kthread.h>
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#include <../drivers/ata/ahci.h>
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#include <linux/export.h>
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#include <linux/debugfs.h>
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#include "mtip32xx.h"
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#define HW_CMD_SLOT_SZ (MTIP_MAX_COMMAND_SLOTS * 32)
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@ -85,6 +86,7 @@ static int instance;
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* allocated in mtip_init().
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*/
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static int mtip_major;
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static struct dentry *dfs_parent;
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static DEFINE_SPINLOCK(rssd_index_lock);
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static DEFINE_IDA(rssd_index_ida);
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@ -2574,6 +2576,120 @@ static ssize_t mtip_hw_show_status(struct device *dev,
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static DEVICE_ATTR(status, S_IRUGO, mtip_hw_show_status, NULL);
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static ssize_t mtip_hw_read_registers(struct file *f, char __user *ubuf,
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size_t len, loff_t *offset)
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{
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struct driver_data *dd = (struct driver_data *)f->private_data;
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char buf[MTIP_DFS_MAX_BUF_SIZE];
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u32 group_allocated;
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int size = *offset;
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int n;
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if (!len || size)
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return 0;
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if (size < 0)
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return -EINVAL;
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size += sprintf(&buf[size], "H/ S ACTive : [ 0x");
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for (n = dd->slot_groups-1; n >= 0; n--)
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size += sprintf(&buf[size], "%08X ",
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readl(dd->port->s_active[n]));
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size += sprintf(&buf[size], "]\n");
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size += sprintf(&buf[size], "H/ Command Issue : [ 0x");
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for (n = dd->slot_groups-1; n >= 0; n--)
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size += sprintf(&buf[size], "%08X ",
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readl(dd->port->cmd_issue[n]));
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size += sprintf(&buf[size], "]\n");
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size += sprintf(&buf[size], "H/ Completed : [ 0x");
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for (n = dd->slot_groups-1; n >= 0; n--)
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size += sprintf(&buf[size], "%08X ",
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readl(dd->port->completed[n]));
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size += sprintf(&buf[size], "]\n");
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size += sprintf(&buf[size], "H/ PORT IRQ STAT : [ 0x%08X ]\n",
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readl(dd->port->mmio + PORT_IRQ_STAT));
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size += sprintf(&buf[size], "H/ HOST IRQ STAT : [ 0x%08X ]\n",
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readl(dd->mmio + HOST_IRQ_STAT));
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size += sprintf(&buf[size], "\n");
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size += sprintf(&buf[size], "L/ Allocated : [ 0x");
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for (n = dd->slot_groups-1; n >= 0; n--) {
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if (sizeof(long) > sizeof(u32))
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group_allocated =
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dd->port->allocated[n/2] >> (32*(n&1));
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else
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group_allocated = dd->port->allocated[n];
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size += sprintf(&buf[size], "%08X ", group_allocated);
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}
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size += sprintf(&buf[size], "]\n");
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size += sprintf(&buf[size], "L/ Commands in Q : [ 0x");
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for (n = dd->slot_groups-1; n >= 0; n--) {
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if (sizeof(long) > sizeof(u32))
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group_allocated =
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dd->port->cmds_to_issue[n/2] >> (32*(n&1));
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else
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group_allocated = dd->port->cmds_to_issue[n];
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size += sprintf(&buf[size], "%08X ", group_allocated);
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}
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size += sprintf(&buf[size], "]\n");
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*offset = size <= len ? size : len;
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size = copy_to_user(ubuf, buf, *offset);
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if (size)
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return -EFAULT;
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return *offset;
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}
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static ssize_t mtip_hw_read_flags(struct file *f, char __user *ubuf,
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size_t len, loff_t *offset)
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{
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struct driver_data *dd = (struct driver_data *)f->private_data;
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char buf[MTIP_DFS_MAX_BUF_SIZE];
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int size = *offset;
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if (!len || size)
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return 0;
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if (size < 0)
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return -EINVAL;
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size += sprintf(&buf[size], "Flag-port : [ %08lX ]\n",
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dd->port->flags);
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size += sprintf(&buf[size], "Flag-dd : [ %08lX ]\n",
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dd->dd_flag);
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*offset = size <= len ? size : len;
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size = copy_to_user(ubuf, buf, *offset);
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if (size)
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return -EFAULT;
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return *offset;
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}
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static const struct file_operations mtip_regs_fops = {
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.owner = THIS_MODULE,
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.open = simple_open,
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.read = mtip_hw_read_registers,
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.llseek = no_llseek,
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};
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static const struct file_operations mtip_flags_fops = {
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.owner = THIS_MODULE,
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.open = simple_open,
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.read = mtip_hw_read_flags,
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.llseek = no_llseek,
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};
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/*
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* Create the sysfs related attributes.
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*
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@ -2615,6 +2731,34 @@ static int mtip_hw_sysfs_exit(struct driver_data *dd, struct kobject *kobj)
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return 0;
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}
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static int mtip_hw_debugfs_init(struct driver_data *dd)
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{
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if (!dfs_parent)
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return -1;
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dd->dfs_node = debugfs_create_dir(dd->disk->disk_name, dfs_parent);
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if (IS_ERR_OR_NULL(dd->dfs_node)) {
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dev_warn(&dd->pdev->dev,
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"Error creating node %s under debugfs\n",
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dd->disk->disk_name);
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dd->dfs_node = NULL;
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return -1;
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}
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debugfs_create_file("flags", S_IRUGO, dd->dfs_node, dd,
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&mtip_flags_fops);
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debugfs_create_file("registers", S_IRUGO, dd->dfs_node, dd,
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&mtip_regs_fops);
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return 0;
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}
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static void mtip_hw_debugfs_exit(struct driver_data *dd)
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{
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debugfs_remove_recursive(dd->dfs_node);
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}
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/*
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* Perform any init/resume time hardware setup
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*
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@ -3640,6 +3784,7 @@ skip_create_disk:
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mtip_hw_sysfs_init(dd, kobj);
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kobject_put(kobj);
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}
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mtip_hw_debugfs_init(dd);
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if (dd->mtip_svc_handler) {
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set_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag);
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@ -3665,6 +3810,8 @@ start_service_thread:
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return rv;
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kthread_run_error:
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mtip_hw_debugfs_exit(dd);
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/* Delete our gendisk. This also removes the device from /dev */
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del_gendisk(dd->disk);
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@ -3715,6 +3862,7 @@ static int mtip_block_remove(struct driver_data *dd)
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kobject_put(kobj);
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}
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}
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mtip_hw_debugfs_exit(dd);
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/*
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* Delete our gendisk structure. This also removes the device
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@ -4062,10 +4210,20 @@ static int __init mtip_init(void)
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}
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mtip_major = error;
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if (!dfs_parent) {
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dfs_parent = debugfs_create_dir("rssd", NULL);
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if (IS_ERR_OR_NULL(dfs_parent)) {
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printk(KERN_WARNING "Error creating debugfs parent\n");
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dfs_parent = NULL;
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}
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}
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/* Register our PCI operations. */
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error = pci_register_driver(&mtip_pci_driver);
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if (error)
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if (error) {
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debugfs_remove(dfs_parent);
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unregister_blkdev(mtip_major, MTIP_DRV_NAME);
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}
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return error;
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}
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@ -4082,6 +4240,8 @@ static int __init mtip_init(void)
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*/
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static void __exit mtip_exit(void)
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{
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debugfs_remove_recursive(dfs_parent);
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/* Release the allocated major block device number. */
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unregister_blkdev(mtip_major, MTIP_DRV_NAME);
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@ -110,6 +110,8 @@
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#define dbg_printk(format, arg...)
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#endif
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#define MTIP_DFS_MAX_BUF_SIZE 1024
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#define __force_bit2int (unsigned int __force)
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enum {
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@ -446,6 +448,8 @@ struct driver_data {
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unsigned long dd_flag; /* NOTE: use atomic bit operations on this */
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struct task_struct *mtip_svc_handler; /* task_struct of svc thd */
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struct dentry *dfs_node;
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};
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#endif
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