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