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// SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note
/*
*
* (C) COPYRIGHT 2020-2023 ARM Limited. All rights reserved.
*
* This program is free software and is provided to you under the terms of the
* GNU General Public License version 2 as published by the Free Software
* Foundation, and any use by you of this program is subject to the terms
* of such GNU license.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, you can access it online at
* http://www.gnu.org/licenses/gpl-2.0.html.
*
*/
#include "mali_kbase_csf_cpu_queue_debugfs.h"
#include <mali_kbase.h>
#include <linux/seq_file.h>
#if IS_ENABLED(CONFIG_DEBUG_FS)
bool kbase_csf_cpu_queue_read_dump_req(struct kbase_context *kctx,
struct base_csf_notification *req)
{
if (atomic_cmpxchg(&kctx->csf.cpu_queue.dump_req_status,
BASE_CSF_CPU_QUEUE_DUMP_ISSUED,
BASE_CSF_CPU_QUEUE_DUMP_PENDING) !=
BASE_CSF_CPU_QUEUE_DUMP_ISSUED) {
return false;
}
req->type = BASE_CSF_NOTIFICATION_CPU_QUEUE_DUMP;
return true;
}
/**
* kbasep_csf_cpu_queue_debugfs_show() - Print cpu queue information for per context
*
* @file: The seq_file for printing to
* @data: The debugfs dentry private data, a pointer to kbase_context
*
* Return: Negative error code or 0 on success.
*/
static int kbasep_csf_cpu_queue_debugfs_show(struct seq_file *file, void *data)
{
struct kbase_context *kctx = file->private;
rt_mutex_lock(&kctx->csf.lock);
if (atomic_read(&kctx->csf.cpu_queue.dump_req_status) !=
BASE_CSF_CPU_QUEUE_DUMP_COMPLETE) {
seq_puts(file, "Dump request already started! (try again)\n");
rt_mutex_unlock(&kctx->csf.lock);
return -EBUSY;
}
atomic_set(&kctx->csf.cpu_queue.dump_req_status, BASE_CSF_CPU_QUEUE_DUMP_ISSUED);
init_completion(&kctx->csf.cpu_queue.dump_cmp);
kbase_event_wakeup_nosync(kctx);
rt_mutex_unlock(&kctx->csf.lock);
seq_puts(file,
"CPU Queues table (version:v" __stringify(MALI_CSF_CPU_QUEUE_DEBUGFS_VERSION) "):\n");
wait_for_completion_timeout(&kctx->csf.cpu_queue.dump_cmp,
msecs_to_jiffies(3000));
rt_mutex_lock(&kctx->csf.lock);
if (kctx->csf.cpu_queue.buffer) {
WARN_ON(atomic_read(&kctx->csf.cpu_queue.dump_req_status) !=
BASE_CSF_CPU_QUEUE_DUMP_PENDING);
seq_printf(file, "%s\n", kctx->csf.cpu_queue.buffer);
kfree(kctx->csf.cpu_queue.buffer);
kctx->csf.cpu_queue.buffer = NULL;
kctx->csf.cpu_queue.buffer_size = 0;
} else
seq_puts(file, "Dump error! (time out)\n");
atomic_set(&kctx->csf.cpu_queue.dump_req_status,
BASE_CSF_CPU_QUEUE_DUMP_COMPLETE);
rt_mutex_unlock(&kctx->csf.lock);
return 0;
}
static int kbasep_csf_cpu_queue_debugfs_open(struct inode *in, struct file *file)
{
return single_open(file, kbasep_csf_cpu_queue_debugfs_show, in->i_private);
}
static const struct file_operations kbasep_csf_cpu_queue_debugfs_fops = {
.open = kbasep_csf_cpu_queue_debugfs_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
void kbase_csf_cpu_queue_debugfs_init(struct kbase_context *kctx)
{
struct dentry *file;
if (WARN_ON(!kctx || IS_ERR_OR_NULL(kctx->kctx_dentry)))
return;
file = debugfs_create_file("cpu_queue", 0444, kctx->kctx_dentry,
kctx, &kbasep_csf_cpu_queue_debugfs_fops);
if (IS_ERR_OR_NULL(file)) {
dev_warn(kctx->kbdev->dev,
"Unable to create cpu queue debugfs entry");
}
kctx->csf.cpu_queue.buffer = NULL;
kctx->csf.cpu_queue.buffer_size = 0;
atomic_set(&kctx->csf.cpu_queue.dump_req_status,
BASE_CSF_CPU_QUEUE_DUMP_COMPLETE);
}
int kbase_csf_cpu_queue_dump(struct kbase_context *kctx,
u64 buffer, size_t buf_size)
{
size_t alloc_size = buf_size;
char *dump_buffer;
if (!buffer || !alloc_size)
return 0;
if (alloc_size > SIZE_MAX - PAGE_SIZE)
return -ENOMEM;
alloc_size = (alloc_size + PAGE_SIZE) & ~(PAGE_SIZE - 1);
dump_buffer = kzalloc(alloc_size, GFP_KERNEL);
if (!dump_buffer)
return -ENOMEM;
WARN_ON(kctx->csf.cpu_queue.buffer != NULL);
if (copy_from_user(dump_buffer,
u64_to_user_ptr(buffer),
buf_size)) {
kfree(dump_buffer);
return -EFAULT;
}
rt_mutex_lock(&kctx->csf.lock);
kfree(kctx->csf.cpu_queue.buffer);
if (atomic_read(&kctx->csf.cpu_queue.dump_req_status) ==
BASE_CSF_CPU_QUEUE_DUMP_PENDING) {
kctx->csf.cpu_queue.buffer = dump_buffer;
kctx->csf.cpu_queue.buffer_size = buf_size;
complete_all(&kctx->csf.cpu_queue.dump_cmp);
} else
kfree(dump_buffer);
rt_mutex_unlock(&kctx->csf.lock);
return 0;
}
#else
/*
* Stub functions for when debugfs is disabled
*/
void kbase_csf_cpu_queue_debugfs_init(struct kbase_context *kctx)
{
}
bool kbase_csf_cpu_queue_read_dump_req(struct kbase_context *kctx,
struct base_csf_notification *req)
{
return false;
}
int kbase_csf_cpu_queue_dump(struct kbase_context *kctx,
u64 buffer, size_t buf_size)
{
return 0;
}
#endif /* CONFIG_DEBUG_FS */
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