1// SPDX-License-Identifier: GPL-2.0-only
2/* Copyright(c) 2023 Intel Corporation */
3
4#include <linux/container_of.h>
5#include <linux/dev_printk.h>
6#include <linux/export.h>
7#include <linux/jiffies.h>
8#include <linux/ktime.h>
9#include <linux/slab.h>
10#include <linux/workqueue.h>
11
12#include "adf_admin.h"
13#include "adf_accel_devices.h"
14#include "adf_common_drv.h"
15#include "adf_timer.h"
16
17#define ADF_DEFAULT_TIMER_PERIOD_MS 200
18
19/* This periodic update is used to trigger HB, RL & TL fw events */
20static void work_handler(struct work_struct *work)
21{
22 struct adf_accel_dev *accel_dev;
23 struct adf_timer *timer_ctx;
24 u32 time_periods;
25
26 timer_ctx = container_of(to_delayed_work(work), struct adf_timer, work_ctx);
27 accel_dev = timer_ctx->accel_dev;
28
29 adf_misc_wq_queue_delayed_work(work: &timer_ctx->work_ctx,
30 delay: msecs_to_jiffies(ADF_DEFAULT_TIMER_PERIOD_MS));
31
32 time_periods = div_u64(dividend: ktime_ms_delta(later: ktime_get_real(), earlier: timer_ctx->initial_ktime),
33 ADF_DEFAULT_TIMER_PERIOD_MS);
34
35 if (adf_send_admin_tim_sync(accel_dev, cnt: time_periods))
36 dev_err(&GET_DEV(accel_dev), "Failed to synchronize qat timer\n");
37}
38
39int adf_timer_start(struct adf_accel_dev *accel_dev)
40{
41 struct adf_timer *timer_ctx;
42
43 timer_ctx = kzalloc(sizeof(*timer_ctx), GFP_KERNEL);
44 if (!timer_ctx)
45 return -ENOMEM;
46
47 timer_ctx->accel_dev = accel_dev;
48 accel_dev->timer = timer_ctx;
49 timer_ctx->initial_ktime = ktime_get_real();
50
51 INIT_DELAYED_WORK(&timer_ctx->work_ctx, work_handler);
52 adf_misc_wq_queue_delayed_work(work: &timer_ctx->work_ctx,
53 delay: msecs_to_jiffies(ADF_DEFAULT_TIMER_PERIOD_MS));
54
55 return 0;
56}
57EXPORT_SYMBOL_GPL(adf_timer_start);
58
59void adf_timer_stop(struct adf_accel_dev *accel_dev)
60{
61 struct adf_timer *timer_ctx = accel_dev->timer;
62
63 if (!timer_ctx)
64 return;
65
66 cancel_delayed_work_sync(dwork: &timer_ctx->work_ctx);
67
68 kfree(objp: timer_ctx);
69 accel_dev->timer = NULL;
70}
71EXPORT_SYMBOL_GPL(adf_timer_stop);
72

source code of linux/drivers/crypto/intel/qat/qat_common/adf_timer.c