// SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note
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/*
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*
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* (C) COPYRIGHT 2020-2021 ARM Limited. All rights reserved.
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*
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* This program is free software and is provided to you under the terms of the
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* GNU General Public License version 2 as published by the Free Software
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* Foundation, and any use by you of this program is subject to the terms
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* of such GNU license.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, you can access it online at
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* http://www.gnu.org/licenses/gpl-2.0.html.
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*
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*/
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#include "mali_kbase_csf_cpu_queue_debugfs.h"
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#include <mali_kbase.h>
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#include <linux/seq_file.h>
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#if IS_ENABLED(CONFIG_DEBUG_FS)
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bool kbase_csf_cpu_queue_read_dump_req(struct kbase_context *kctx,
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struct base_csf_notification *req)
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{
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if (atomic_cmpxchg(&kctx->csf.cpu_queue.dump_req_status,
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BASE_CSF_CPU_QUEUE_DUMP_ISSUED,
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BASE_CSF_CPU_QUEUE_DUMP_PENDING) !=
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BASE_CSF_CPU_QUEUE_DUMP_ISSUED) {
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return false;
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}
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req->type = BASE_CSF_NOTIFICATION_CPU_QUEUE_DUMP;
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return true;
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}
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/**
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* kbasep_csf_cpu_queue_debugfs_show() - Print cpu queue information for per context
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*
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* @file: The seq_file for printing to
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* @data: The debugfs dentry private data, a pointer to kbase_context
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*
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* Return: Negative error code or 0 on success.
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*/
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static int kbasep_csf_cpu_queue_debugfs_show(struct seq_file *file, void *data)
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{
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struct kbase_context *kctx = file->private;
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mutex_lock(&kctx->csf.lock);
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if (atomic_read(&kctx->csf.cpu_queue.dump_req_status) !=
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BASE_CSF_CPU_QUEUE_DUMP_COMPLETE) {
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seq_puts(file, "Dump request already started! (try again)\n");
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mutex_unlock(&kctx->csf.lock);
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return -EBUSY;
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}
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atomic_set(&kctx->csf.cpu_queue.dump_req_status, BASE_CSF_CPU_QUEUE_DUMP_ISSUED);
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init_completion(&kctx->csf.cpu_queue.dump_cmp);
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kbase_event_wakeup(kctx);
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mutex_unlock(&kctx->csf.lock);
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seq_puts(file,
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"CPU Queues table (version:v" __stringify(MALI_CSF_CPU_QUEUE_DEBUGFS_VERSION) "):\n");
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wait_for_completion_timeout(&kctx->csf.cpu_queue.dump_cmp,
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msecs_to_jiffies(3000));
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mutex_lock(&kctx->csf.lock);
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if (kctx->csf.cpu_queue.buffer) {
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WARN_ON(atomic_read(&kctx->csf.cpu_queue.dump_req_status) !=
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BASE_CSF_CPU_QUEUE_DUMP_PENDING);
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seq_printf(file, "%s\n", kctx->csf.cpu_queue.buffer);
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kfree(kctx->csf.cpu_queue.buffer);
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kctx->csf.cpu_queue.buffer = NULL;
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kctx->csf.cpu_queue.buffer_size = 0;
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} else
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seq_puts(file, "Dump error! (time out)\n");
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atomic_set(&kctx->csf.cpu_queue.dump_req_status,
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BASE_CSF_CPU_QUEUE_DUMP_COMPLETE);
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mutex_unlock(&kctx->csf.lock);
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return 0;
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}
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static int kbasep_csf_cpu_queue_debugfs_open(struct inode *in, struct file *file)
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{
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return single_open(file, kbasep_csf_cpu_queue_debugfs_show, in->i_private);
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}
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static const struct file_operations kbasep_csf_cpu_queue_debugfs_fops = {
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.open = kbasep_csf_cpu_queue_debugfs_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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void kbase_csf_cpu_queue_debugfs_init(struct kbase_context *kctx)
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{
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struct dentry *file;
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if (WARN_ON(!kctx || IS_ERR_OR_NULL(kctx->kctx_dentry)))
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return;
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file = debugfs_create_file("cpu_queue", 0444, kctx->kctx_dentry,
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kctx, &kbasep_csf_cpu_queue_debugfs_fops);
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if (IS_ERR_OR_NULL(file)) {
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dev_warn(kctx->kbdev->dev,
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"Unable to create cpu queue debugfs entry");
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}
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kctx->csf.cpu_queue.buffer = NULL;
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kctx->csf.cpu_queue.buffer_size = 0;
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atomic_set(&kctx->csf.cpu_queue.dump_req_status,
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BASE_CSF_CPU_QUEUE_DUMP_COMPLETE);
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}
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int kbase_csf_cpu_queue_dump(struct kbase_context *kctx,
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u64 buffer, size_t buf_size)
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{
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int err = 0;
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size_t alloc_size = buf_size;
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char *dump_buffer;
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if (!buffer || !alloc_size)
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goto done;
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alloc_size = (alloc_size + PAGE_SIZE) & ~(PAGE_SIZE - 1);
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dump_buffer = kzalloc(alloc_size, GFP_KERNEL);
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if (ZERO_OR_NULL_PTR(dump_buffer)) {
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err = -ENOMEM;
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goto done;
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}
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WARN_ON(kctx->csf.cpu_queue.buffer != NULL);
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err = copy_from_user(dump_buffer,
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u64_to_user_ptr(buffer),
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buf_size);
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if (err) {
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kfree(dump_buffer);
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err = -EFAULT;
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goto done;
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}
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mutex_lock(&kctx->csf.lock);
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kfree(kctx->csf.cpu_queue.buffer);
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if (atomic_read(&kctx->csf.cpu_queue.dump_req_status) ==
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BASE_CSF_CPU_QUEUE_DUMP_PENDING) {
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kctx->csf.cpu_queue.buffer = dump_buffer;
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kctx->csf.cpu_queue.buffer_size = buf_size;
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complete_all(&kctx->csf.cpu_queue.dump_cmp);
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} else {
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kfree(dump_buffer);
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}
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mutex_unlock(&kctx->csf.lock);
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done:
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return err;
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}
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#else
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/*
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* Stub functions for when debugfs is disabled
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*/
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void kbase_csf_cpu_queue_debugfs_init(struct kbase_context *kctx)
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{
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}
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bool kbase_csf_cpu_queue_read_dump_req(struct kbase_context *kctx,
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struct base_csf_notification *req)
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{
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return false;
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}
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int kbase_csf_cpu_queue_dump(struct kbase_context *kctx,
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u64 buffer, size_t buf_size)
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{
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return 0;
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}
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#endif /* CONFIG_DEBUG_FS */
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