drivers/misc/mic/cosm/cosm_debugfs.c

   1 /*
   2  * Intel MIC Platform Software Stack (MPSS)
   3  *
   4  * Copyright(c) 2015 Intel Corporation.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License, version 2, as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  13  * General Public License for more details.
  14  *
  15  * The full GNU General Public License is included in this distribution in
  16  * the file called "COPYING".
  17  *
  18  * Intel MIC Coprocessor State Management (COSM) Driver
  19  *
  20  */
  21
  22 #include <linux/debugfs.h>
  23 #include <linux/slab.h>
  24 #include <linux/io.h>
  25 #include "cosm_main.h"
  26
  27 /* Debugfs parent dir */
  28 static struct dentry *cosm_dbg;
  29
  30 /**
  31  * cosm_log_buf_show - Display MIC kernel log buffer
  32  *
  33  * log_buf addr/len is read from System.map by user space
  34  * and populated in sysfs entries.
  35  */
  36 static int cosm_log_buf_show(struct seq_file *s, void *unused)
  37 {
  38         void __iomem *log_buf_va;
  39         int __iomem *log_buf_len_va;
  40         struct cosm_device *cdev = s->private;
  41         void *kva;
  42         int size;
  43         u64 aper_offset;
  44
  45         if (!cdev || !cdev->log_buf_addr || !cdev->log_buf_len)
  46                 goto done;
  47
  48         mutex_lock(&cdev->cosm_mutex);
  49         switch (cdev->state) {
  50         case MIC_BOOTING:
  51         case MIC_ONLINE:
  52         case MIC_SHUTTING_DOWN:
  53                 break;
  54         default:
  55                 goto unlock;
  56         }
  57
  58         /*
  59          * Card kernel will never be relocated and any kernel text/data mapping
  60          * can be translated to phys address by subtracting __START_KERNEL_map.
  61          */
  62         aper_offset = (u64)cdev->log_buf_len - __START_KERNEL_map;
  63         log_buf_len_va = cdev->hw_ops->aper(cdev)->va + aper_offset;
  64         aper_offset = (u64)cdev->log_buf_addr - __START_KERNEL_map;
  65         log_buf_va = cdev->hw_ops->aper(cdev)->va + aper_offset;
  66
  67         size = ioread32(log_buf_len_va);
  68         kva = kmalloc(size, GFP_KERNEL);
  69         if (!kva)
  70                 goto unlock;
  71
  72         memcpy_fromio(kva, log_buf_va, size);
  73         seq_write(s, kva, size);
  74         kfree(kva);
  75 unlock:
  76         mutex_unlock(&cdev->cosm_mutex);
  77 done:
  78         return 0;
  79 }
  80
  81 static int cosm_log_buf_open(struct inode *inode, struct file *file)
  82 {
  83         return single_open(file, cosm_log_buf_show, inode->i_private);
  84 }
  85
  86 static const struct file_operations log_buf_ops = {
  87         .owner   = THIS_MODULE,
  88         .open    = cosm_log_buf_open,
  89         .read    = seq_read,
  90         .llseek  = seq_lseek,
  91         .release = single_release
  92 };
  93
  94 /**
  95  * cosm_force_reset_show - Force MIC reset
  96  *
  97  * Invokes the force_reset COSM bus op instead of the standard reset
  98  * op in case a force reset of the MIC device is required
  99  */
 100 static int cosm_force_reset_show(struct seq_file *s, void *pos)
 101 {
 102         struct cosm_device *cdev = s->private;
 103
 104         cosm_stop(cdev, true);
 105         return 0;
 106 }
 107
 108 static int cosm_force_reset_debug_open(struct inode *inode, struct file *file)
 109 {
 110         return single_open(file, cosm_force_reset_show, inode->i_private);
 111 }
 112
 113 static const struct file_operations force_reset_ops = {
 114         .owner   = THIS_MODULE,
 115         .open    = cosm_force_reset_debug_open,
 116         .read    = seq_read,
 117         .llseek  = seq_lseek,
 118         .release = single_release
 119 };
 120
 121 void cosm_create_debug_dir(struct cosm_device *cdev)
 122 {
 123         char name[16];
 124
 125         if (!cosm_dbg)
 126                 return;
 127
 128         scnprintf(name, sizeof(name), "mic%d", cdev->index);
 129         cdev->dbg_dir = debugfs_create_dir(name, cosm_dbg);
 130         if (!cdev->dbg_dir)
 131                 return;
 132
 133         debugfs_create_file("log_buf", 0444, cdev->dbg_dir, cdev, &log_buf_ops);
 134         debugfs_create_file("force_reset", 0444, cdev->dbg_dir, cdev,
 135                             &force_reset_ops);
 136 }
 137
 138 void cosm_delete_debug_dir(struct cosm_device *cdev)
 139 {
 140         if (!cdev->dbg_dir)
 141                 return;
 142
 143         debugfs_remove_recursive(cdev->dbg_dir);
 144 }
 145
 146 void cosm_init_debugfs(void)
 147 {
 148         cosm_dbg = debugfs_create_dir(KBUILD_MODNAME, NULL);
 149         if (!cosm_dbg)
 150                 pr_err("can't create debugfs dir\n");
 151 }
 152
 153 void cosm_exit_debugfs(void)
 154 {
 155         debugfs_remove(cosm_dbg);
 156 }