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// SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note
/*
*
* (C) COPYRIGHT 2019-2021 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 <linux/kernel.h>
#include <linux/device.h>
#include <linux/mutex.h>
#include <linux/sysfs.h>
#include <linux/of.h>
#include "mali_kbase.h"
#include "mali_kbase_config_defaults.h"
#include "mali_kbase_csf_firmware.h"
#include "mali_kbase_csf_timeout.h"
#include "mali_kbase_reset_gpu.h"
#include "backend/gpu/mali_kbase_pm_internal.h"
/**
* set_timeout - set a new global progress timeout.
*
* @kbdev: Instance of a GPU platform device that implements a CSF interface.
* @timeout: the maximum number of GPU cycles without forward progress to allow
* to elapse before terminating a GPU command queue group.
*
* Return: 0 on success, or negative on failure
* (e.g. -ERANGE if the requested timeout is too large).
*/
static int set_timeout(struct kbase_device *const kbdev, u64 const timeout)
{
if (timeout > GLB_PROGRESS_TIMER_TIMEOUT_MAX) {
dev_err(kbdev->dev, "Timeout %llu is too large.\n", timeout);
return -ERANGE;
}
dev_dbg(kbdev->dev, "New progress timeout: %llu cycles\n", timeout);
atomic64_set(&kbdev->csf.progress_timeout, timeout);
return 0;
}
/**
* progress_timeout_store - Store the progress_timeout device attribute.
* @dev: The device that has the attribute.
* @attr: The attributes of the sysfs file.
* @buf: The value written to the sysfs file.
* @count: The number of bytes written to the sysfs file.
*
* This function is called when the progress_timeout sysfs file is written to.
* It checks the data written, and if valid updates the progress timeout value.
* The function also checks gpu reset status, if the gpu is in reset process,
* the function will return an error code (-EBUSY), and no change for timeout
* value.
*
* Return: @count if the function succeeded. An error code on failure.
*/
static ssize_t progress_timeout_store(struct device * const dev,
struct device_attribute * const attr, const char * const buf,
size_t const count)
{
struct kbase_device *const kbdev = dev_get_drvdata(dev);
int err;
u64 timeout;
if (!kbdev)
return -ENODEV;
err = kbase_reset_gpu_try_prevent(kbdev);
if (err) {
dev_warn(kbdev->dev,
"Couldn't process progress_timeout write operation for GPU reset.\n");
return -EBUSY;
}
err = kstrtou64(buf, 0, &timeout);
if (err)
dev_err(kbdev->dev,
"Couldn't process progress_timeout write operation.\n"
"Use format <progress_timeout>\n");
else
err = set_timeout(kbdev, timeout);
if (!err) {
kbase_csf_scheduler_pm_active(kbdev);
err = kbase_csf_scheduler_wait_mcu_active(kbdev);
if (!err)
err = kbase_csf_firmware_set_timeout(kbdev, timeout);
kbase_csf_scheduler_pm_idle(kbdev);
}
kbase_reset_gpu_allow(kbdev);
if (err)
return err;
return count;
}
/**
* progress_timeout_show - Show the progress_timeout device attribute.
* @dev: The device that has the attribute.
* @attr: The attributes of the sysfs file.
* @buf: The output buffer to receive the global timeout.
*
* This function is called to get the progress timeout value.
*
* Return: The number of bytes output to @buf.
*/
static ssize_t progress_timeout_show(struct device * const dev,
struct device_attribute * const attr, char * const buf)
{
struct kbase_device *const kbdev = dev_get_drvdata(dev);
int err;
if (!kbdev)
return -ENODEV;
err = scnprintf(buf, PAGE_SIZE, "%llu\n", kbase_csf_timeout_get(kbdev));
return err;
}
static DEVICE_ATTR_RW(progress_timeout);
int kbase_csf_timeout_init(struct kbase_device *const kbdev)
{
u64 timeout = DEFAULT_PROGRESS_TIMEOUT;
int err;
#if IS_ENABLED(CONFIG_OF)
err = of_property_read_u64(kbdev->dev->of_node,
"progress_timeout", &timeout);
if (!err)
dev_info(kbdev->dev, "Found progress_timeout = %llu in Devicetree\n",
timeout);
#endif
err = set_timeout(kbdev, timeout);
if (err)
return err;
err = sysfs_create_file(&kbdev->dev->kobj,
&dev_attr_progress_timeout.attr);
if (err)
dev_err(kbdev->dev, "SysFS file creation failed\n");
return err;
}
void kbase_csf_timeout_term(struct kbase_device * const kbdev)
{
sysfs_remove_file(&kbdev->dev->kobj, &dev_attr_progress_timeout.attr);
}
u64 kbase_csf_timeout_get(struct kbase_device *const kbdev)
{
return atomic64_read(&kbdev->csf.progress_timeout);
}
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