LXR linux/drivers/misc/mic/cosm/cosm

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Intel MIC Platform Software Stack (MPSS)
   4 *
   5 * Copyright(c) 2015 Intel Corporation.
   6 *
   7 * Intel MIC Coprocessor State Management (COSM) Driver
   8 */
   9
  10#include <linux/debugfs.h>
  11#include <linux/slab.h>
  12#include <linux/io.h>
  13#include "cosm_main.h"
  14
  15/* Debugfs parent dir */
  16static struct dentry *cosm_dbg;
  17
  18/**
  19 * log_buf_show - Display MIC kernel log buffer
  20 *
  21 * log_buf addr/len is read from System.map by user space
  22 * and populated in sysfs entries.
  23 */
  24static int log_buf_show(struct seq_file *s, void *unused)
  25{
  26        void __iomem *log_buf_va;
  27        int __iomem *log_buf_len_va;
  28        struct cosm_device *cdev = s->private;
  29        void *kva;
  30        int size;
  31        u64 aper_offset;
  32
  33        if (!cdev || !cdev->log_buf_addr || !cdev->log_buf_len)
  34                goto done;
  35
  36        mutex_lock(&cdev->cosm_mutex);
  37        switch (cdev->state) {
  38        case MIC_BOOTING:
  39        case MIC_ONLINE:
  40        case MIC_SHUTTING_DOWN:
  41                break;
  42        default:
  43                goto unlock;
  44        }
  45
  46        /*
  47         * Card kernel will never be relocated and any kernel text/data mapping
  48         * can be translated to phys address by subtracting __START_KERNEL_map.
  49         */
  50        aper_offset = (u64)cdev->log_buf_len - __START_KERNEL_map;
  51        log_buf_len_va = cdev->hw_ops->aper(cdev)->va + aper_offset;
  52        aper_offset = (u64)cdev->log_buf_addr - __START_KERNEL_map;
  53        log_buf_va = cdev->hw_ops->aper(cdev)->va + aper_offset;
  54
  55        size = ioread32(log_buf_len_va);
  56        kva = kmalloc(size, GFP_KERNEL);
  57        if (!kva)
  58                goto unlock;
  59
  60        memcpy_fromio(kva, log_buf_va, size);
  61        seq_write(s, kva, size);
  62        kfree(kva);
  63unlock:
  64        mutex_unlock(&cdev->cosm_mutex);
  65done:
  66        return 0;
  67}
  68
  69DEFINE_SHOW_ATTRIBUTE(log_buf);
  70
  71/**
  72 * force_reset_show - Force MIC reset
  73 *
  74 * Invokes the force_reset COSM bus op instead of the standard reset
  75 * op in case a force reset of the MIC device is required
  76 */
  77static int force_reset_show(struct seq_file *s, void *pos)
  78{
  79        struct cosm_device *cdev = s->private;
  80
  81        cosm_stop(cdev, true);
  82        return 0;
  83}
  84
  85DEFINE_SHOW_ATTRIBUTE(force_reset);
  86
  87void cosm_create_debug_dir(struct cosm_device *cdev)
  88{
  89        char name[16];
  90
  91        if (!cosm_dbg)
  92                return;
  93
  94        scnprintf(name, sizeof(name), "mic%d", cdev->index);
  95        cdev->dbg_dir = debugfs_create_dir(name, cosm_dbg);
  96        if (!cdev->dbg_dir)
  97                return;
  98
  99        debugfs_create_file("log_buf", 0444, cdev->dbg_dir, cdev,
 100                            &log_buf_fops);
 101        debugfs_create_file("force_reset", 0444, cdev->dbg_dir, cdev,
 102                            &force_reset_fops);
 103}
 104
 105void cosm_delete_debug_dir(struct cosm_device *cdev)
 106{
 107        if (!cdev->dbg_dir)
 108                return;
 109
 110        debugfs_remove_recursive(cdev->dbg_dir);
 111}
 112
 113void cosm_init_debugfs(void)
 114{
 115        cosm_dbg = debugfs_create_dir(KBUILD_MODNAME, NULL);
 116        if (!cosm_dbg)
 117                pr_err("can't create debugfs dir\n");
 118}
 119
 120void cosm_exit_debugfs(void)
 121{
 122        debugfs_remove(cosm_dbg);
 123}
 124