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Merge tag 'vfs-6.13-rc7.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
[J-linux.git] / drivers / crypto / intel / qat / qat_common / adf_heartbeat_inject.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Copyright(c) 2023 Intel Corporation */
3 #include <linux/random.h>
4
5 #include "adf_admin.h"
6 #include "adf_common_drv.h"
7 #include "adf_heartbeat.h"
8
9 #define MAX_HB_TICKS 0xFFFFFFFF
10
11 static int adf_hb_set_timer_to_max(struct adf_accel_dev *accel_dev)
12 {
13         struct adf_hw_device_data *hw_data = accel_dev->hw_device;
14
15         accel_dev->heartbeat->hb_timer = 0;
16
17         if (hw_data->stop_timer)
18                 hw_data->stop_timer(accel_dev);
19
20         return adf_send_admin_hb_timer(accel_dev, MAX_HB_TICKS);
21 }
22
23 static void adf_set_hb_counters_fail(struct adf_accel_dev *accel_dev, u32 ae,
24                                      u32 thr)
25 {
26         struct hb_cnt_pair *stats = accel_dev->heartbeat->dma.virt_addr;
27         struct adf_hw_device_data *hw_device = accel_dev->hw_device;
28         const size_t max_aes = hw_device->get_num_aes(hw_device);
29         const size_t hb_ctrs = hw_device->num_hb_ctrs;
30         size_t thr_id = ae * hb_ctrs + thr;
31         u16 num_rsp = stats[thr_id].resp_heartbeat_cnt;
32
33         /*
34          * Inject live.req != live.rsp and live.rsp == last.rsp
35          * to trigger the heartbeat error detection
36          */
37         stats[thr_id].req_heartbeat_cnt++;
38         stats += (max_aes * hb_ctrs);
39         stats[thr_id].resp_heartbeat_cnt = num_rsp;
40 }
41
42 int adf_heartbeat_inject_error(struct adf_accel_dev *accel_dev)
43 {
44         struct adf_hw_device_data *hw_device = accel_dev->hw_device;
45         const size_t max_aes = hw_device->get_num_aes(hw_device);
46         const size_t hb_ctrs = hw_device->num_hb_ctrs;
47         u32 rand, rand_ae, rand_thr;
48         unsigned long ae_mask;
49         int ret;
50
51         ae_mask = hw_device->ae_mask;
52
53         do {
54                 /* Ensure we have a valid ae */
55                 get_random_bytes(&rand, sizeof(rand));
56                 rand_ae = rand % max_aes;
57         } while (!test_bit(rand_ae, &ae_mask));
58
59         get_random_bytes(&rand, sizeof(rand));
60         rand_thr = rand % hb_ctrs;
61
62         /* Increase the heartbeat timer to prevent FW updating HB counters */
63         ret = adf_hb_set_timer_to_max(accel_dev);
64         if (ret)
65                 return ret;
66
67         /* Configure worker threads to stop processing any packet */
68         ret = adf_disable_arb_thd(accel_dev, rand_ae, rand_thr);
69         if (ret)
70                 return ret;
71
72         /* Change HB counters memory to simulate a hang */
73         adf_set_hb_counters_fail(accel_dev, rand_ae, rand_thr);
74
75         return 0;
76 }
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