cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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system.c (3404B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * System Control and Management Interface (SCMI) System Power Protocol
      4 *
      5 * Copyright (C) 2020-2022 ARM Ltd.
      6 */
      7
      8#define pr_fmt(fmt) "SCMI Notifications SYSTEM - " fmt
      9
     10#include <linux/module.h>
     11#include <linux/scmi_protocol.h>
     12
     13#include "protocols.h"
     14#include "notify.h"
     15
     16#define SCMI_SYSTEM_NUM_SOURCES		1
     17
     18enum scmi_system_protocol_cmd {
     19	SYSTEM_POWER_STATE_NOTIFY = 0x5,
     20};
     21
     22struct scmi_system_power_state_notify {
     23	__le32 notify_enable;
     24};
     25
     26struct scmi_system_power_state_notifier_payld {
     27	__le32 agent_id;
     28	__le32 flags;
     29	__le32 system_state;
     30};
     31
     32struct scmi_system_info {
     33	u32 version;
     34};
     35
     36static int scmi_system_request_notify(const struct scmi_protocol_handle *ph,
     37				      bool enable)
     38{
     39	int ret;
     40	struct scmi_xfer *t;
     41	struct scmi_system_power_state_notify *notify;
     42
     43	ret = ph->xops->xfer_get_init(ph, SYSTEM_POWER_STATE_NOTIFY,
     44				      sizeof(*notify), 0, &t);
     45	if (ret)
     46		return ret;
     47
     48	notify = t->tx.buf;
     49	notify->notify_enable = enable ? cpu_to_le32(BIT(0)) : 0;
     50
     51	ret = ph->xops->do_xfer(ph, t);
     52
     53	ph->xops->xfer_put(ph, t);
     54	return ret;
     55}
     56
     57static int scmi_system_set_notify_enabled(const struct scmi_protocol_handle *ph,
     58					  u8 evt_id, u32 src_id, bool enable)
     59{
     60	int ret;
     61
     62	ret = scmi_system_request_notify(ph, enable);
     63	if (ret)
     64		pr_debug("FAIL_ENABLE - evt[%X] - ret:%d\n", evt_id, ret);
     65
     66	return ret;
     67}
     68
     69static void *
     70scmi_system_fill_custom_report(const struct scmi_protocol_handle *ph,
     71			       u8 evt_id, ktime_t timestamp,
     72			       const void *payld, size_t payld_sz,
     73			       void *report, u32 *src_id)
     74{
     75	const struct scmi_system_power_state_notifier_payld *p = payld;
     76	struct scmi_system_power_state_notifier_report *r = report;
     77
     78	if (evt_id != SCMI_EVENT_SYSTEM_POWER_STATE_NOTIFIER ||
     79	    sizeof(*p) != payld_sz)
     80		return NULL;
     81
     82	r->timestamp = timestamp;
     83	r->agent_id = le32_to_cpu(p->agent_id);
     84	r->flags = le32_to_cpu(p->flags);
     85	r->system_state = le32_to_cpu(p->system_state);
     86	*src_id = 0;
     87
     88	return r;
     89}
     90
     91static const struct scmi_event system_events[] = {
     92	{
     93		.id = SCMI_EVENT_SYSTEM_POWER_STATE_NOTIFIER,
     94		.max_payld_sz =
     95			sizeof(struct scmi_system_power_state_notifier_payld),
     96		.max_report_sz =
     97			sizeof(struct scmi_system_power_state_notifier_report),
     98	},
     99};
    100
    101static const struct scmi_event_ops system_event_ops = {
    102	.set_notify_enabled = scmi_system_set_notify_enabled,
    103	.fill_custom_report = scmi_system_fill_custom_report,
    104};
    105
    106static const struct scmi_protocol_events system_protocol_events = {
    107	.queue_sz = SCMI_PROTO_QUEUE_SZ,
    108	.ops = &system_event_ops,
    109	.evts = system_events,
    110	.num_events = ARRAY_SIZE(system_events),
    111	.num_sources = SCMI_SYSTEM_NUM_SOURCES,
    112};
    113
    114static int scmi_system_protocol_init(const struct scmi_protocol_handle *ph)
    115{
    116	int ret;
    117	u32 version;
    118	struct scmi_system_info *pinfo;
    119
    120	ret = ph->xops->version_get(ph, &version);
    121	if (ret)
    122		return ret;
    123
    124	dev_dbg(ph->dev, "System Power Version %d.%d\n",
    125		PROTOCOL_REV_MAJOR(version), PROTOCOL_REV_MINOR(version));
    126
    127	pinfo = devm_kzalloc(ph->dev, sizeof(*pinfo), GFP_KERNEL);
    128	if (!pinfo)
    129		return -ENOMEM;
    130
    131	pinfo->version = version;
    132	return ph->set_priv(ph, pinfo);
    133}
    134
    135static const struct scmi_protocol scmi_system = {
    136	.id = SCMI_PROTOCOL_SYSTEM,
    137	.owner = THIS_MODULE,
    138	.instance_init = &scmi_system_protocol_init,
    139	.ops = NULL,
    140	.events = &system_protocol_events,
    141};
    142
    143DEFINE_SCMI_PROTOCOL_REGISTER_UNREGISTER(system, scmi_system)