u-boot/arch/arm/mach-apple/rtkit.c
Janne Grunau 942b54b4ee arm: apple: Increase RTKit timeouts
Timeouts are not expected to happen and are handled as fatal errors.
Increase all timeouts to 1 second as defensive measure to avoid relying
on the timing behaviour of certain firmware versions or configurations.

Signed-off-by: Janne Grunau <j@jannau.net>
Reviewed-by: Mark Kettenis <kettenis@openbsd.org>
Tested-by: Mark Kettenis <kettenis@openbsd.org>
2022-06-23 08:24:49 -04:00

340 lines
8.9 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2021 Mark Kettenis <kettenis@openbsd.org>
* (C) Copyright 2021 Copyright The Asahi Linux Contributors
*/
#include <common.h>
#include <mailbox.h>
#include <malloc.h>
#include <asm/arch/rtkit.h>
#include <linux/apple-mailbox.h>
#include <linux/bitfield.h>
#define APPLE_RTKIT_EP_MGMT 0
#define APPLE_RTKIT_EP_CRASHLOG 1
#define APPLE_RTKIT_EP_SYSLOG 2
#define APPLE_RTKIT_EP_DEBUG 3
#define APPLE_RTKIT_EP_IOREPORT 4
#define APPLE_RTKIT_EP_TRACEKIT 10
/* Messages for management endpoint. */
#define APPLE_RTKIT_MGMT_TYPE GENMASK(59, 52)
#define APPLE_RTKIT_MGMT_PWR_STATE GENMASK(15, 0)
#define APPLE_RTKIT_MGMT_HELLO 1
#define APPLE_RTKIT_MGMT_HELLO_REPLY 2
#define APPLE_RTKIT_MGMT_HELLO_MINVER GENMASK(15, 0)
#define APPLE_RTKIT_MGMT_HELLO_MAXVER GENMASK(31, 16)
#define APPLE_RTKIT_MGMT_STARTEP 5
#define APPLE_RTKIT_MGMT_STARTEP_EP GENMASK(39, 32)
#define APPLE_RTKIT_MGMT_STARTEP_FLAG BIT(1)
#define APPLE_RTKIT_MGMT_SET_IOP_PWR_STATE 6
#define APPLE_RTKIT_MGMT_SET_IOP_PWR_STATE_ACK 7
#define APPLE_RTKIT_MGMT_EPMAP 8
#define APPLE_RTKIT_MGMT_EPMAP_LAST BIT(51)
#define APPLE_RTKIT_MGMT_EPMAP_BASE GENMASK(34, 32)
#define APPLE_RTKIT_MGMT_EPMAP_BITMAP GENMASK(31, 0)
#define APPLE_RTKIT_MGMT_EPMAP_REPLY 8
#define APPLE_RTKIT_MGMT_EPMAP_REPLY_MORE BIT(0)
#define APPLE_RTKIT_MIN_SUPPORTED_VERSION 11
#define APPLE_RTKIT_MAX_SUPPORTED_VERSION 12
/* Messages for internal endpoints. */
#define APPLE_RTKIT_BUFFER_REQUEST 1
#define APPLE_RTKIT_BUFFER_REQUEST_SIZE GENMASK(51, 44)
#define APPLE_RTKIT_BUFFER_REQUEST_IOVA GENMASK(41, 0)
#define TIMEOUT_1SEC_US 1000000
struct apple_rtkit {
struct mbox_chan *chan;
void *cookie;
apple_rtkit_shmem_setup shmem_setup;
apple_rtkit_shmem_destroy shmem_destroy;
struct apple_rtkit_buffer syslog_buffer;
struct apple_rtkit_buffer crashlog_buffer;
struct apple_rtkit_buffer ioreport_buffer;
};
struct apple_rtkit *apple_rtkit_init(struct mbox_chan *chan, void *cookie,
apple_rtkit_shmem_setup shmem_setup,
apple_rtkit_shmem_destroy shmem_destroy)
{
struct apple_rtkit *rtk;
rtk = calloc(sizeof(*rtk), 1);
if (!rtk)
return NULL;
rtk->chan = chan;
rtk->cookie = cookie;
rtk->shmem_setup = shmem_setup;
rtk->shmem_destroy = shmem_destroy;
return rtk;
}
void apple_rtkit_free(struct apple_rtkit *rtk)
{
if (rtk->shmem_destroy) {
if (rtk->syslog_buffer.buffer)
rtk->shmem_destroy(rtk->cookie, &rtk->syslog_buffer);
if (rtk->crashlog_buffer.buffer)
rtk->shmem_destroy(rtk->cookie, &rtk->crashlog_buffer);
if (rtk->ioreport_buffer.buffer)
rtk->shmem_destroy(rtk->cookie, &rtk->ioreport_buffer);
}
free(rtk);
}
static int rtkit_handle_buf_req(struct apple_rtkit *rtk, int endpoint, struct apple_mbox_msg *msg)
{
struct apple_rtkit_buffer *buf;
size_t num_4kpages;
int ret;
num_4kpages = FIELD_GET(APPLE_RTKIT_BUFFER_REQUEST_SIZE, msg->msg0);
if (num_4kpages == 0) {
printf("%s: unexpected request for buffer without size\n", __func__);
return -1;
}
switch (endpoint) {
case APPLE_RTKIT_EP_CRASHLOG:
buf = &rtk->crashlog_buffer;
break;
case APPLE_RTKIT_EP_SYSLOG:
buf = &rtk->syslog_buffer;
break;
case APPLE_RTKIT_EP_IOREPORT:
buf = &rtk->ioreport_buffer;
break;
default:
printf("%s: unexpected endpoint %d\n", __func__, endpoint);
return -1;
}
buf->dva = FIELD_GET(APPLE_RTKIT_BUFFER_REQUEST_IOVA, msg->msg0);
buf->size = num_4kpages << 12;
buf->is_mapped = false;
if (rtk->shmem_setup) {
ret = rtk->shmem_setup(rtk->cookie, buf);
if (ret < 0) {
printf("%s: shmen_setup failed for endpoint %d\n", __func__,
endpoint);
return ret;
}
}
if (!buf->is_mapped) {
msg->msg0 = FIELD_PREP(APPLE_RTKIT_MGMT_TYPE, APPLE_RTKIT_BUFFER_REQUEST) |
FIELD_PREP(APPLE_RTKIT_BUFFER_REQUEST_SIZE, num_4kpages) |
FIELD_PREP(APPLE_RTKIT_BUFFER_REQUEST_IOVA, buf->dva);
msg->msg1 = endpoint;
return mbox_send(rtk->chan, msg);
}
return 0;
}
int apple_rtkit_boot(struct apple_rtkit *rtk)
{
struct apple_mbox_msg msg;
int endpoints[256];
int nendpoints = 0;
int endpoint;
int min_ver, max_ver, want_ver;
int msgtype, pwrstate;
u64 reply;
u32 bitmap, base;
int i, ret;
/* Wakup the IOP. */
msg.msg0 = FIELD_PREP(APPLE_RTKIT_MGMT_TYPE, APPLE_RTKIT_MGMT_SET_IOP_PWR_STATE) |
FIELD_PREP(APPLE_RTKIT_MGMT_PWR_STATE, APPLE_RTKIT_PWR_STATE_ON);
msg.msg1 = APPLE_RTKIT_EP_MGMT;
ret = mbox_send(rtk->chan, &msg);
if (ret < 0)
return ret;
/* Wait for protocol version negotiation message. */
ret = mbox_recv(rtk->chan, &msg, TIMEOUT_1SEC_US);
if (ret < 0)
return ret;
endpoint = msg.msg1;
msgtype = FIELD_GET(APPLE_RTKIT_MGMT_TYPE, msg.msg0);
if (endpoint != APPLE_RTKIT_EP_MGMT) {
printf("%s: unexpected endpoint %d\n", __func__, endpoint);
return -EINVAL;
}
if (msgtype != APPLE_RTKIT_MGMT_HELLO) {
printf("%s: unexpected message type %d\n", __func__, msgtype);
return -EINVAL;
}
min_ver = FIELD_GET(APPLE_RTKIT_MGMT_HELLO_MINVER, msg.msg0);
max_ver = FIELD_GET(APPLE_RTKIT_MGMT_HELLO_MAXVER, msg.msg0);
want_ver = min(APPLE_RTKIT_MAX_SUPPORTED_VERSION, max_ver);
if (min_ver > APPLE_RTKIT_MAX_SUPPORTED_VERSION) {
printf("%s: firmware min version %d is too new\n",
__func__, min_ver);
return -ENOTSUPP;
}
if (max_ver < APPLE_RTKIT_MIN_SUPPORTED_VERSION) {
printf("%s: firmware max version %d is too old\n",
__func__, max_ver);
return -ENOTSUPP;
}
/* Ack version. */
msg.msg0 = FIELD_PREP(APPLE_RTKIT_MGMT_TYPE, APPLE_RTKIT_MGMT_HELLO_REPLY) |
FIELD_PREP(APPLE_RTKIT_MGMT_HELLO_MINVER, want_ver) |
FIELD_PREP(APPLE_RTKIT_MGMT_HELLO_MAXVER, want_ver);
msg.msg1 = APPLE_RTKIT_EP_MGMT;
ret = mbox_send(rtk->chan, &msg);
if (ret < 0)
return ret;
wait_epmap:
/* Wait for endpoint map message. */
ret = mbox_recv(rtk->chan, &msg, TIMEOUT_1SEC_US);
if (ret < 0)
return ret;
endpoint = msg.msg1;
msgtype = FIELD_GET(APPLE_RTKIT_MGMT_TYPE, msg.msg0);
if (endpoint != APPLE_RTKIT_EP_MGMT) {
printf("%s: unexpected endpoint %d\n", __func__, endpoint);
return -EINVAL;
}
if (msgtype != APPLE_RTKIT_MGMT_EPMAP) {
printf("%s: unexpected message type %d\n", __func__, msgtype);
return -EINVAL;
}
bitmap = FIELD_GET(APPLE_RTKIT_MGMT_EPMAP_BITMAP, msg.msg0);
base = FIELD_GET(APPLE_RTKIT_MGMT_EPMAP_BASE, msg.msg0);
for (i = 0; i < 32; i++) {
if (bitmap & (1U << i))
endpoints[nendpoints++] = base * 32 + i;
}
/* Ack endpoint map. */
reply = FIELD_PREP(APPLE_RTKIT_MGMT_TYPE, APPLE_RTKIT_MGMT_EPMAP_REPLY) |
FIELD_PREP(APPLE_RTKIT_MGMT_EPMAP_BASE, base);
if (msg.msg0 & APPLE_RTKIT_MGMT_EPMAP_LAST)
reply |= APPLE_RTKIT_MGMT_EPMAP_LAST;
else
reply |= APPLE_RTKIT_MGMT_EPMAP_REPLY_MORE;
msg.msg0 = reply;
msg.msg1 = APPLE_RTKIT_EP_MGMT;
ret = mbox_send(rtk->chan, &msg);
if (ret < 0)
return ret;
if (reply & APPLE_RTKIT_MGMT_EPMAP_REPLY_MORE)
goto wait_epmap;
for (i = 0; i < nendpoints; i++) {
/* Start only necessary endpoints. The syslog endpoint is
* particularly noisy and its message can't easily be handled
* within U-Boot.
*/
switch (endpoints[i]) {
case APPLE_RTKIT_EP_MGMT:
case APPLE_RTKIT_EP_SYSLOG:
case APPLE_RTKIT_EP_DEBUG:
case APPLE_RTKIT_EP_TRACEKIT:
continue;
default:
break;
}
/* Request endpoint. */
msg.msg0 = FIELD_PREP(APPLE_RTKIT_MGMT_TYPE, APPLE_RTKIT_MGMT_STARTEP) |
FIELD_PREP(APPLE_RTKIT_MGMT_STARTEP_EP, endpoints[i]) |
APPLE_RTKIT_MGMT_STARTEP_FLAG;
msg.msg1 = APPLE_RTKIT_EP_MGMT;
ret = mbox_send(rtk->chan, &msg);
if (ret < 0)
return ret;
}
pwrstate = APPLE_RTKIT_PWR_STATE_SLEEP;
while (pwrstate != APPLE_RTKIT_PWR_STATE_ON) {
ret = mbox_recv(rtk->chan, &msg, TIMEOUT_1SEC_US);
if (ret < 0)
return ret;
endpoint = msg.msg1;
msgtype = FIELD_GET(APPLE_RTKIT_MGMT_TYPE, msg.msg0);
if (endpoint == APPLE_RTKIT_EP_CRASHLOG ||
endpoint == APPLE_RTKIT_EP_SYSLOG ||
endpoint == APPLE_RTKIT_EP_IOREPORT) {
if (msgtype == APPLE_RTKIT_BUFFER_REQUEST) {
ret = rtkit_handle_buf_req(rtk, endpoint, &msg);
if (ret < 0)
return ret;
continue;
}
}
if (endpoint == APPLE_RTKIT_EP_IOREPORT) {
// these two messages have to be ack-ed for proper startup
if (msgtype == 0xc || msgtype == 0x8) {
ret = mbox_send(rtk->chan, &msg);
if (ret < 0)
return ret;
continue;
}
}
if (endpoint != APPLE_RTKIT_EP_MGMT) {
printf("%s: unexpected endpoint %d\n", __func__, endpoint);
return -EINVAL;
}
if (msgtype != APPLE_RTKIT_MGMT_SET_IOP_PWR_STATE_ACK) {
printf("%s: unexpected message type %d\n", __func__, msgtype);
return -EINVAL;
}
pwrstate = FIELD_GET(APPLE_RTKIT_MGMT_PWR_STATE, msg.msg0);
}
return 0;
}
int apple_rtkit_shutdown(struct apple_rtkit *rtk, int pwrstate)
{
struct apple_mbox_msg msg;
int ret;
msg.msg0 = FIELD_PREP(APPLE_RTKIT_MGMT_TYPE, APPLE_RTKIT_MGMT_SET_IOP_PWR_STATE) |
FIELD_PREP(APPLE_RTKIT_MGMT_PWR_STATE, pwrstate);
msg.msg1 = APPLE_RTKIT_EP_MGMT;
ret = mbox_send(rtk->chan, &msg);
if (ret < 0)
return ret;
ret = mbox_recv(rtk->chan, &msg, TIMEOUT_1SEC_US);
if (ret < 0)
return ret;
return 0;
}