f632a8170a
Pull driver core and debugfs updates from Greg KH:
"Here is the "big" driver core and debugfs changes for 5.3-rc1
It's a lot of different patches, all across the tree due to some api
changes and lots of debugfs cleanups.
Other than the debugfs cleanups, in this set of changes we have:
- bus iteration function cleanups
- scripts/get_abi.pl tool to display and parse Documentation/ABI
entries in a simple way
- cleanups to Documenatation/ABI/ entries to make them parse easier
due to typos and other minor things
- default_attrs use for some ktype users
- driver model documentation file conversions to .rst
- compressed firmware file loading
- deferred probe fixes
All of these have been in linux-next for a while, with a bunch of
merge issues that Stephen has been patient with me for"
* tag 'driver-core-5.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (102 commits)
debugfs: make error message a bit more verbose
orangefs: fix build warning from debugfs cleanup patch
ubifs: fix build warning after debugfs cleanup patch
driver: core: Allow subsystems to continue deferring probe
drivers: base: cacheinfo: Ensure cpu hotplug work is done before Intel RDT
arch_topology: Remove error messages on out-of-memory conditions
lib: notifier-error-inject: no need to check return value of debugfs_create functions
swiotlb: no need to check return value of debugfs_create functions
ceph: no need to check return value of debugfs_create functions
sunrpc: no need to check return value of debugfs_create functions
ubifs: no need to check return value of debugfs_create functions
orangefs: no need to check return value of debugfs_create functions
nfsd: no need to check return value of debugfs_create functions
lib: 842: no need to check return value of debugfs_create functions
debugfs: provide pr_fmt() macro
debugfs: log errors when something goes wrong
drivers: s390/cio: Fix compilation warning about const qualifiers
drivers: Add generic helper to match by of_node
driver_find_device: Unify the match function with class_find_device()
bus_find_device: Unify the match callback with class_find_device
...
120 lines
2.5 KiB
C
120 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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* Intel MIC Coprocessor State Management (COSM) Driver
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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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