e079231676
QAT devices implement a mechanism that allows them to go autonomously to a low power state depending on the load. Expose power management info by providing the "pm_status" file under debugfs. This includes PM state, PM event log, PM event counters, PM HW CSRs, per-resource type constrain counters and per-domain power gating status specific to the QAT device. This information is retrieved from (1) the FW by means of ICP_QAT_FW_PM_INFO command, (2) CSRs and (3) counters collected by the device driver. In addition, add logic to keep track and report power management event interrupts and acks/nacks sent to FW to allow/prevent state transitions. Signed-off-by: Lucas Segarra Fernandez <lucas.segarra.fernandez@intel.com> Reviewed-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
48 lines
1.1 KiB
C
48 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright(c) 2023 Intel Corporation */
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#include <linux/debugfs.h>
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#include <linux/fs.h>
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#include <linux/kernel.h>
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#include "adf_accel_devices.h"
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#include "adf_pm_dbgfs.h"
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static ssize_t pm_status_read(struct file *f, char __user *buf, size_t count,
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loff_t *pos)
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{
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struct adf_accel_dev *accel_dev = file_inode(f)->i_private;
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struct adf_pm pm = accel_dev->power_management;
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if (pm.print_pm_status)
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return pm.print_pm_status(accel_dev, buf, count, pos);
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return count;
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}
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static const struct file_operations pm_status_fops = {
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.owner = THIS_MODULE,
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.read = pm_status_read,
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};
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void adf_pm_dbgfs_add(struct adf_accel_dev *accel_dev)
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{
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struct adf_pm *pm = &accel_dev->power_management;
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if (!pm->present || !pm->print_pm_status)
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return;
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pm->debugfs_pm_status = debugfs_create_file("pm_status", 0400,
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accel_dev->debugfs_dir,
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accel_dev, &pm_status_fops);
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}
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void adf_pm_dbgfs_rm(struct adf_accel_dev *accel_dev)
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{
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struct adf_pm *pm = &accel_dev->power_management;
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if (!pm->present)
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return;
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debugfs_remove(pm->debugfs_pm_status);
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pm->debugfs_pm_status = NULL;
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}
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