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7e9f02a789
When calling debugfs functions, there is no need to ever check the return value. The function can work or not, but the code logic should never do something different based on this. Cc: Ashutosh Dixit <ashutosh.dixit@intel.com> Cc: linux-kernel@vger.kernel.org Reviewed-by: Arnd Bergmann <arnd@arndb.de> Reviewed-by: Sudeep Dutt <sudeep.dutt@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
131 lines
3 KiB
C
131 lines
3 KiB
C
/*
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* Intel MIC Platform Software Stack (MPSS)
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*
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* Copyright(c) 2015 Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, version 2, as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* The full GNU General Public License is included in this distribution in
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* the file called "COPYING".
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*
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* Intel MIC Coprocessor State Management (COSM) Driver
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*
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*/
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#include <linux/debugfs.h>
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#include <linux/slab.h>
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#include <linux/io.h>
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#include "cosm_main.h"
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/* Debugfs parent dir */
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static struct dentry *cosm_dbg;
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/**
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* log_buf_show - Display MIC kernel log buffer
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*
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* log_buf addr/len is read from System.map by user space
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* and populated in sysfs entries.
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*/
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static int log_buf_show(struct seq_file *s, void *unused)
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{
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void __iomem *log_buf_va;
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int __iomem *log_buf_len_va;
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struct cosm_device *cdev = s->private;
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void *kva;
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int size;
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u64 aper_offset;
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if (!cdev || !cdev->log_buf_addr || !cdev->log_buf_len)
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goto done;
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mutex_lock(&cdev->cosm_mutex);
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switch (cdev->state) {
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case MIC_BOOTING:
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case MIC_ONLINE:
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case MIC_SHUTTING_DOWN:
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break;
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default:
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goto unlock;
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}
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/*
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* Card kernel will never be relocated and any kernel text/data mapping
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* can be translated to phys address by subtracting __START_KERNEL_map.
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*/
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aper_offset = (u64)cdev->log_buf_len - __START_KERNEL_map;
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log_buf_len_va = cdev->hw_ops->aper(cdev)->va + aper_offset;
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aper_offset = (u64)cdev->log_buf_addr - __START_KERNEL_map;
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log_buf_va = cdev->hw_ops->aper(cdev)->va + aper_offset;
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size = ioread32(log_buf_len_va);
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kva = kmalloc(size, GFP_KERNEL);
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if (!kva)
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goto unlock;
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memcpy_fromio(kva, log_buf_va, size);
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seq_write(s, kva, size);
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kfree(kva);
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unlock:
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mutex_unlock(&cdev->cosm_mutex);
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done:
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return 0;
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}
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DEFINE_SHOW_ATTRIBUTE(log_buf);
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/**
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* force_reset_show - Force MIC reset
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*
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* Invokes the force_reset COSM bus op instead of the standard reset
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* op in case a force reset of the MIC device is required
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*/
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static int force_reset_show(struct seq_file *s, void *pos)
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{
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struct cosm_device *cdev = s->private;
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cosm_stop(cdev, true);
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return 0;
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}
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DEFINE_SHOW_ATTRIBUTE(force_reset);
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void cosm_create_debug_dir(struct cosm_device *cdev)
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{
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char name[16];
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if (!cosm_dbg)
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return;
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scnprintf(name, sizeof(name), "mic%d", cdev->index);
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cdev->dbg_dir = debugfs_create_dir(name, cosm_dbg);
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debugfs_create_file("log_buf", 0444, cdev->dbg_dir, cdev,
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&log_buf_fops);
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debugfs_create_file("force_reset", 0444, cdev->dbg_dir, cdev,
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&force_reset_fops);
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}
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void cosm_delete_debug_dir(struct cosm_device *cdev)
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{
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if (!cdev->dbg_dir)
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return;
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debugfs_remove_recursive(cdev->dbg_dir);
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}
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void cosm_init_debugfs(void)
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{
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cosm_dbg = debugfs_create_dir(KBUILD_MODNAME, NULL);
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}
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void cosm_exit_debugfs(void)
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{
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debugfs_remove(cosm_dbg);
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}
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