1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * (C) COPYRIGHT 2020-2021 ARM Limited. All rights reserved.
5*4882a593Smuzhiyun *
6*4882a593Smuzhiyun * This program is free software and is provided to you under the terms of the
7*4882a593Smuzhiyun * GNU General Public License version 2 as published by the Free Software
8*4882a593Smuzhiyun * Foundation, and any use by you of this program is subject to the terms
9*4882a593Smuzhiyun * of such GNU license.
10*4882a593Smuzhiyun *
11*4882a593Smuzhiyun * This program is distributed in the hope that it will be useful,
12*4882a593Smuzhiyun * but WITHOUT ANY WARRANTY; without even the implied warranty of
13*4882a593Smuzhiyun * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14*4882a593Smuzhiyun * GNU General Public License for more details.
15*4882a593Smuzhiyun *
16*4882a593Smuzhiyun * You should have received a copy of the GNU General Public License
17*4882a593Smuzhiyun * along with this program; if not, you can access it online at
18*4882a593Smuzhiyun * http://www.gnu.org/licenses/gpl-2.0.html.
19*4882a593Smuzhiyun *
20*4882a593Smuzhiyun */
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun #include "mali_kbase_ccswe.h"
23*4882a593Smuzhiyun #include "mali_kbase_linux.h"
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun #include <linux/math64.h>
26*4882a593Smuzhiyun #include <linux/time.h>
27*4882a593Smuzhiyun
kbasep_ccswe_cycle_at_no_lock(struct kbase_ccswe * self,u64 timestamp_ns)28*4882a593Smuzhiyun static u64 kbasep_ccswe_cycle_at_no_lock(
29*4882a593Smuzhiyun struct kbase_ccswe *self, u64 timestamp_ns)
30*4882a593Smuzhiyun {
31*4882a593Smuzhiyun s64 diff_s, diff_ns;
32*4882a593Smuzhiyun u32 gpu_freq;
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun lockdep_assert_held(&self->access);
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun diff_ns = timestamp_ns - self->timestamp_ns;
37*4882a593Smuzhiyun gpu_freq = diff_ns > 0 ? self->gpu_freq : self->prev_gpu_freq;
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun diff_s = div_s64(diff_ns, NSEC_PER_SEC);
40*4882a593Smuzhiyun diff_ns -= diff_s * NSEC_PER_SEC;
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun return self->cycles_elapsed + diff_s * gpu_freq
43*4882a593Smuzhiyun + div_s64(diff_ns * gpu_freq, NSEC_PER_SEC);
44*4882a593Smuzhiyun }
45*4882a593Smuzhiyun
kbase_ccswe_init(struct kbase_ccswe * self)46*4882a593Smuzhiyun void kbase_ccswe_init(struct kbase_ccswe *self)
47*4882a593Smuzhiyun {
48*4882a593Smuzhiyun memset(self, 0, sizeof(*self));
49*4882a593Smuzhiyun
50*4882a593Smuzhiyun spin_lock_init(&self->access);
51*4882a593Smuzhiyun }
52*4882a593Smuzhiyun
kbase_ccswe_cycle_at(struct kbase_ccswe * self,u64 timestamp_ns)53*4882a593Smuzhiyun u64 kbase_ccswe_cycle_at(struct kbase_ccswe *self, u64 timestamp_ns)
54*4882a593Smuzhiyun {
55*4882a593Smuzhiyun unsigned long flags;
56*4882a593Smuzhiyun u64 result;
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun spin_lock_irqsave(&self->access, flags);
59*4882a593Smuzhiyun result = kbasep_ccswe_cycle_at_no_lock(self, timestamp_ns);
60*4882a593Smuzhiyun spin_unlock_irqrestore(&self->access, flags);
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun return result;
63*4882a593Smuzhiyun }
64*4882a593Smuzhiyun
kbase_ccswe_freq_change(struct kbase_ccswe * self,u64 timestamp_ns,u32 gpu_freq)65*4882a593Smuzhiyun void kbase_ccswe_freq_change(
66*4882a593Smuzhiyun struct kbase_ccswe *self, u64 timestamp_ns, u32 gpu_freq)
67*4882a593Smuzhiyun {
68*4882a593Smuzhiyun unsigned long flags;
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun spin_lock_irqsave(&self->access, flags);
71*4882a593Smuzhiyun
72*4882a593Smuzhiyun /* The time must go only forward. */
73*4882a593Smuzhiyun if (WARN_ON(timestamp_ns < self->timestamp_ns))
74*4882a593Smuzhiyun goto exit;
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun /* If this is the first frequency change, cycles_elapsed is zero. */
77*4882a593Smuzhiyun if (self->timestamp_ns)
78*4882a593Smuzhiyun self->cycles_elapsed = kbasep_ccswe_cycle_at_no_lock(
79*4882a593Smuzhiyun self, timestamp_ns);
80*4882a593Smuzhiyun
81*4882a593Smuzhiyun self->timestamp_ns = timestamp_ns;
82*4882a593Smuzhiyun self->prev_gpu_freq = self->gpu_freq;
83*4882a593Smuzhiyun self->gpu_freq = gpu_freq;
84*4882a593Smuzhiyun exit:
85*4882a593Smuzhiyun spin_unlock_irqrestore(&self->access, flags);
86*4882a593Smuzhiyun }
87*4882a593Smuzhiyun
kbase_ccswe_reset(struct kbase_ccswe * self)88*4882a593Smuzhiyun void kbase_ccswe_reset(struct kbase_ccswe *self)
89*4882a593Smuzhiyun {
90*4882a593Smuzhiyun unsigned long flags;
91*4882a593Smuzhiyun
92*4882a593Smuzhiyun spin_lock_irqsave(&self->access, flags);
93*4882a593Smuzhiyun
94*4882a593Smuzhiyun self->timestamp_ns = 0;
95*4882a593Smuzhiyun self->cycles_elapsed = 0;
96*4882a593Smuzhiyun self->gpu_freq = 0;
97*4882a593Smuzhiyun self->prev_gpu_freq = 0;
98*4882a593Smuzhiyun
99*4882a593Smuzhiyun spin_unlock_irqrestore(&self->access, flags);
100*4882a593Smuzhiyun }
101