1 // SPDX-License-Identifier: GPL-2.0-only
3 * Intel MIC Platform Software Stack (MPSS)
5 * Copyright(c) 2015 Intel Corporation.
7 * Intel MIC Coprocessor State Management (COSM) Driver
10 #include <linux/debugfs.h>
11 #include <linux/slab.h>
13 #include "cosm_main.h"
15 /* Debugfs parent dir */
16 static struct dentry *cosm_dbg;
19 * log_buf_show - Display MIC kernel log buffer
21 * log_buf addr/len is read from System.map by user space
22 * and populated in sysfs entries.
24 static int log_buf_show(struct seq_file *s, void *unused)
26 void __iomem *log_buf_va;
27 int __iomem *log_buf_len_va;
28 struct cosm_device *cdev = s->private;
33 if (!cdev || !cdev->log_buf_addr || !cdev->log_buf_len)
36 mutex_lock(&cdev->cosm_mutex);
37 switch (cdev->state) {
40 case MIC_SHUTTING_DOWN:
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.
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;
55 size = ioread32(log_buf_len_va);
56 kva = kmalloc(size, GFP_KERNEL);
60 memcpy_fromio(kva, log_buf_va, size);
61 seq_write(s, kva, size);
64 mutex_unlock(&cdev->cosm_mutex);
69 DEFINE_SHOW_ATTRIBUTE(log_buf);
72 * force_reset_show - Force MIC reset
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
77 static int force_reset_show(struct seq_file *s, void *pos)
79 struct cosm_device *cdev = s->private;
81 cosm_stop(cdev, true);
85 DEFINE_SHOW_ATTRIBUTE(force_reset);
87 void cosm_create_debug_dir(struct cosm_device *cdev)
94 scnprintf(name, sizeof(name), "mic%d", cdev->index);
95 cdev->dbg_dir = debugfs_create_dir(name, cosm_dbg);
97 debugfs_create_file("log_buf", 0444, cdev->dbg_dir, cdev,
99 debugfs_create_file("force_reset", 0444, cdev->dbg_dir, cdev,
103 void cosm_delete_debug_dir(struct cosm_device *cdev)
108 debugfs_remove_recursive(cdev->dbg_dir);
111 void cosm_init_debugfs(void)
113 cosm_dbg = debugfs_create_dir(KBUILD_MODNAME, NULL);
116 void cosm_exit_debugfs(void)
118 debugfs_remove(cosm_dbg);