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OpenCloudOS-Kernel/drivers/soc/apple/rtkit.c

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// SPDX-License-Identifier: GPL-2.0-only OR MIT
/*
* Apple RTKit IPC library
* Copyright (C) The Asahi Linux Contributors
*/
#include "rtkit-internal.h"
enum {
APPLE_RTKIT_PWR_STATE_OFF = 0x00, /* power off, cannot be restarted */
APPLE_RTKIT_PWR_STATE_SLEEP = 0x01, /* sleeping, can be restarted */
APPLE_RTKIT_PWR_STATE_QUIESCED = 0x10, /* running but no communication */
APPLE_RTKIT_PWR_STATE_ON = 0x20, /* normal operating state */
};
enum {
APPLE_RTKIT_EP_MGMT = 0,
APPLE_RTKIT_EP_CRASHLOG = 1,
APPLE_RTKIT_EP_SYSLOG = 2,
APPLE_RTKIT_EP_DEBUG = 3,
APPLE_RTKIT_EP_IOREPORT = 4,
APPLE_RTKIT_EP_OSLOG = 8,
};
#define APPLE_RTKIT_MGMT_TYPE GENMASK_ULL(59, 52)
enum {
APPLE_RTKIT_MGMT_HELLO = 1,
APPLE_RTKIT_MGMT_HELLO_REPLY = 2,
APPLE_RTKIT_MGMT_STARTEP = 5,
APPLE_RTKIT_MGMT_SET_IOP_PWR_STATE = 6,
APPLE_RTKIT_MGMT_SET_IOP_PWR_STATE_ACK = 7,
APPLE_RTKIT_MGMT_EPMAP = 8,
APPLE_RTKIT_MGMT_EPMAP_REPLY = 8,
APPLE_RTKIT_MGMT_SET_AP_PWR_STATE = 0xb,
APPLE_RTKIT_MGMT_SET_AP_PWR_STATE_ACK = 0xb,
};
#define APPLE_RTKIT_MGMT_HELLO_MINVER GENMASK_ULL(15, 0)
#define APPLE_RTKIT_MGMT_HELLO_MAXVER GENMASK_ULL(31, 16)
#define APPLE_RTKIT_MGMT_EPMAP_LAST BIT_ULL(51)
#define APPLE_RTKIT_MGMT_EPMAP_BASE GENMASK_ULL(34, 32)
#define APPLE_RTKIT_MGMT_EPMAP_BITMAP GENMASK_ULL(31, 0)
#define APPLE_RTKIT_MGMT_EPMAP_REPLY_MORE BIT_ULL(0)
#define APPLE_RTKIT_MGMT_STARTEP_EP GENMASK_ULL(39, 32)
#define APPLE_RTKIT_MGMT_STARTEP_FLAG BIT_ULL(1)
#define APPLE_RTKIT_MGMT_PWR_STATE GENMASK_ULL(15, 0)
#define APPLE_RTKIT_CRASHLOG_CRASH 1
#define APPLE_RTKIT_BUFFER_REQUEST 1
#define APPLE_RTKIT_BUFFER_REQUEST_SIZE GENMASK_ULL(51, 44)
#define APPLE_RTKIT_BUFFER_REQUEST_IOVA GENMASK_ULL(41, 0)
#define APPLE_RTKIT_SYSLOG_TYPE GENMASK_ULL(59, 52)
#define APPLE_RTKIT_SYSLOG_LOG 5
#define APPLE_RTKIT_SYSLOG_INIT 8
#define APPLE_RTKIT_SYSLOG_N_ENTRIES GENMASK_ULL(7, 0)
#define APPLE_RTKIT_SYSLOG_MSG_SIZE GENMASK_ULL(31, 24)
#define APPLE_RTKIT_OSLOG_TYPE GENMASK_ULL(63, 56)
#define APPLE_RTKIT_OSLOG_INIT 1
#define APPLE_RTKIT_OSLOG_ACK 3
#define APPLE_RTKIT_MIN_SUPPORTED_VERSION 11
#define APPLE_RTKIT_MAX_SUPPORTED_VERSION 12
struct apple_rtkit_msg {
struct completion *completion;
struct apple_mbox_msg mbox_msg;
};
struct apple_rtkit_rx_work {
struct apple_rtkit *rtk;
u8 ep;
u64 msg;
struct work_struct work;
};
bool apple_rtkit_is_running(struct apple_rtkit *rtk)
{
if (rtk->crashed)
return false;
if ((rtk->iop_power_state & 0xff) != APPLE_RTKIT_PWR_STATE_ON)
return false;
if ((rtk->ap_power_state & 0xff) != APPLE_RTKIT_PWR_STATE_ON)
return false;
return true;
}
EXPORT_SYMBOL_GPL(apple_rtkit_is_running);
bool apple_rtkit_is_crashed(struct apple_rtkit *rtk)
{
return rtk->crashed;
}
EXPORT_SYMBOL_GPL(apple_rtkit_is_crashed);
static void apple_rtkit_management_send(struct apple_rtkit *rtk, u8 type,
u64 msg)
{
msg &= ~APPLE_RTKIT_MGMT_TYPE;
msg |= FIELD_PREP(APPLE_RTKIT_MGMT_TYPE, type);
apple_rtkit_send_message(rtk, APPLE_RTKIT_EP_MGMT, msg, NULL, false);
}
static void apple_rtkit_management_rx_hello(struct apple_rtkit *rtk, u64 msg)
{
u64 reply;
int min_ver = FIELD_GET(APPLE_RTKIT_MGMT_HELLO_MINVER, msg);
int max_ver = FIELD_GET(APPLE_RTKIT_MGMT_HELLO_MAXVER, msg);
int want_ver = min(APPLE_RTKIT_MAX_SUPPORTED_VERSION, max_ver);
dev_dbg(rtk->dev, "RTKit: Min ver %d, max ver %d\n", min_ver, max_ver);
if (min_ver > APPLE_RTKIT_MAX_SUPPORTED_VERSION) {
dev_err(rtk->dev, "RTKit: Firmware min version %d is too new\n",
min_ver);
goto abort_boot;
}
if (max_ver < APPLE_RTKIT_MIN_SUPPORTED_VERSION) {
dev_err(rtk->dev, "RTKit: Firmware max version %d is too old\n",
max_ver);
goto abort_boot;
}
dev_info(rtk->dev, "RTKit: Initializing (protocol version %d)\n",
want_ver);
rtk->version = want_ver;
reply = FIELD_PREP(APPLE_RTKIT_MGMT_HELLO_MINVER, want_ver);
reply |= FIELD_PREP(APPLE_RTKIT_MGMT_HELLO_MAXVER, want_ver);
apple_rtkit_management_send(rtk, APPLE_RTKIT_MGMT_HELLO_REPLY, reply);
return;
abort_boot:
rtk->boot_result = -EINVAL;
complete_all(&rtk->epmap_completion);
}
static void apple_rtkit_management_rx_epmap(struct apple_rtkit *rtk, u64 msg)
{
int i, ep;
u64 reply;
unsigned long bitmap = FIELD_GET(APPLE_RTKIT_MGMT_EPMAP_BITMAP, msg);
u32 base = FIELD_GET(APPLE_RTKIT_MGMT_EPMAP_BASE, msg);
dev_dbg(rtk->dev,
"RTKit: received endpoint bitmap 0x%lx with base 0x%x\n",
bitmap, base);
for_each_set_bit(i, &bitmap, 32) {
ep = 32 * base + i;
dev_dbg(rtk->dev, "RTKit: Discovered endpoint 0x%02x\n", ep);
set_bit(ep, rtk->endpoints);
}
reply = FIELD_PREP(APPLE_RTKIT_MGMT_EPMAP_BASE, base);
if (msg & APPLE_RTKIT_MGMT_EPMAP_LAST)
reply |= APPLE_RTKIT_MGMT_EPMAP_LAST;
else
reply |= APPLE_RTKIT_MGMT_EPMAP_REPLY_MORE;
apple_rtkit_management_send(rtk, APPLE_RTKIT_MGMT_EPMAP_REPLY, reply);
if (!(msg & APPLE_RTKIT_MGMT_EPMAP_LAST))
return;
for_each_set_bit(ep, rtk->endpoints, APPLE_RTKIT_APP_ENDPOINT_START) {
switch (ep) {
/* the management endpoint is started by default */
case APPLE_RTKIT_EP_MGMT:
break;
/* without starting these RTKit refuses to boot */
case APPLE_RTKIT_EP_SYSLOG:
case APPLE_RTKIT_EP_CRASHLOG:
case APPLE_RTKIT_EP_DEBUG:
case APPLE_RTKIT_EP_IOREPORT:
case APPLE_RTKIT_EP_OSLOG:
dev_dbg(rtk->dev,
"RTKit: Starting system endpoint 0x%02x\n", ep);
apple_rtkit_start_ep(rtk, ep);
break;
default:
dev_warn(rtk->dev,
"RTKit: Unknown system endpoint: 0x%02x\n",
ep);
}
}
rtk->boot_result = 0;
complete_all(&rtk->epmap_completion);
}
static void apple_rtkit_management_rx_iop_pwr_ack(struct apple_rtkit *rtk,
u64 msg)
{
unsigned int new_state = FIELD_GET(APPLE_RTKIT_MGMT_PWR_STATE, msg);
dev_dbg(rtk->dev, "RTKit: IOP power state transition: 0x%x -> 0x%x\n",
rtk->iop_power_state, new_state);
rtk->iop_power_state = new_state;
complete_all(&rtk->iop_pwr_ack_completion);
}
static void apple_rtkit_management_rx_ap_pwr_ack(struct apple_rtkit *rtk,
u64 msg)
{
unsigned int new_state = FIELD_GET(APPLE_RTKIT_MGMT_PWR_STATE, msg);
dev_dbg(rtk->dev, "RTKit: AP power state transition: 0x%x -> 0x%x\n",
rtk->ap_power_state, new_state);
rtk->ap_power_state = new_state;
complete_all(&rtk->ap_pwr_ack_completion);
}
static void apple_rtkit_management_rx(struct apple_rtkit *rtk, u64 msg)
{
u8 type = FIELD_GET(APPLE_RTKIT_MGMT_TYPE, msg);
switch (type) {
case APPLE_RTKIT_MGMT_HELLO:
apple_rtkit_management_rx_hello(rtk, msg);
break;
case APPLE_RTKIT_MGMT_EPMAP:
apple_rtkit_management_rx_epmap(rtk, msg);
break;
case APPLE_RTKIT_MGMT_SET_IOP_PWR_STATE_ACK:
apple_rtkit_management_rx_iop_pwr_ack(rtk, msg);
break;
case APPLE_RTKIT_MGMT_SET_AP_PWR_STATE_ACK:
apple_rtkit_management_rx_ap_pwr_ack(rtk, msg);
break;
default:
dev_warn(
rtk->dev,
"RTKit: unknown management message: 0x%llx (type: 0x%02x)\n",
msg, type);
}
}
static int apple_rtkit_common_rx_get_buffer(struct apple_rtkit *rtk,
struct apple_rtkit_shmem *buffer,
u8 ep, u64 msg)
{
size_t n_4kpages = FIELD_GET(APPLE_RTKIT_BUFFER_REQUEST_SIZE, msg);
u64 reply;
int err;
buffer->buffer = NULL;
buffer->iomem = NULL;
buffer->is_mapped = false;
buffer->iova = FIELD_GET(APPLE_RTKIT_BUFFER_REQUEST_IOVA, msg);
buffer->size = n_4kpages << 12;
dev_dbg(rtk->dev, "RTKit: buffer request for 0x%zx bytes at %pad\n",
buffer->size, &buffer->iova);
if (buffer->iova &&
(!rtk->ops->shmem_setup || !rtk->ops->shmem_destroy)) {
err = -EINVAL;
goto error;
}
if (rtk->ops->shmem_setup) {
err = rtk->ops->shmem_setup(rtk->cookie, buffer);
if (err)
goto error;
} else {
buffer->buffer = dma_alloc_coherent(rtk->dev, buffer->size,
&buffer->iova, GFP_KERNEL);
if (!buffer->buffer) {
err = -ENOMEM;
goto error;
}
}
if (!buffer->is_mapped) {
reply = FIELD_PREP(APPLE_RTKIT_SYSLOG_TYPE,
APPLE_RTKIT_BUFFER_REQUEST);
reply |= FIELD_PREP(APPLE_RTKIT_BUFFER_REQUEST_SIZE, n_4kpages);
reply |= FIELD_PREP(APPLE_RTKIT_BUFFER_REQUEST_IOVA,
buffer->iova);
apple_rtkit_send_message(rtk, ep, reply, NULL, false);
}
return 0;
error:
buffer->buffer = NULL;
buffer->iomem = NULL;
buffer->iova = 0;
buffer->size = 0;
buffer->is_mapped = false;
return err;
}
static void apple_rtkit_free_buffer(struct apple_rtkit *rtk,
struct apple_rtkit_shmem *bfr)
{
if (bfr->size == 0)
return;
if (rtk->ops->shmem_destroy)
rtk->ops->shmem_destroy(rtk->cookie, bfr);
else if (bfr->buffer)
dma_free_coherent(rtk->dev, bfr->size, bfr->buffer, bfr->iova);
bfr->buffer = NULL;
bfr->iomem = NULL;
bfr->iova = 0;
bfr->size = 0;
bfr->is_mapped = false;
}
static void apple_rtkit_memcpy(struct apple_rtkit *rtk, void *dst,
struct apple_rtkit_shmem *bfr, size_t offset,
size_t len)
{
if (bfr->iomem)
memcpy_fromio(dst, bfr->iomem + offset, len);
else
memcpy(dst, bfr->buffer + offset, len);
}
static void apple_rtkit_crashlog_rx(struct apple_rtkit *rtk, u64 msg)
{
u8 type = FIELD_GET(APPLE_RTKIT_SYSLOG_TYPE, msg);
u8 *bfr;
if (type != APPLE_RTKIT_CRASHLOG_CRASH) {
dev_warn(rtk->dev, "RTKit: Unknown crashlog message: %llx\n",
msg);
return;
}
if (!rtk->crashlog_buffer.size) {
apple_rtkit_common_rx_get_buffer(rtk, &rtk->crashlog_buffer,
APPLE_RTKIT_EP_CRASHLOG, msg);
return;
}
dev_err(rtk->dev, "RTKit: co-processor has crashed\n");
/*
* create a shadow copy here to make sure the co-processor isn't able
* to change the log while we're dumping it. this also ensures
* the buffer is in normal memory and not iomem for e.g. the SMC
*/
bfr = kzalloc(rtk->crashlog_buffer.size, GFP_KERNEL);
if (bfr) {
apple_rtkit_memcpy(rtk, bfr, &rtk->crashlog_buffer, 0,
rtk->crashlog_buffer.size);
apple_rtkit_crashlog_dump(rtk, bfr, rtk->crashlog_buffer.size);
kfree(bfr);
} else {
dev_err(rtk->dev,
"RTKit: Couldn't allocate crashlog shadow buffer\n");
}
rtk->crashed = true;
if (rtk->ops->crashed)
rtk->ops->crashed(rtk->cookie);
}
static void apple_rtkit_ioreport_rx(struct apple_rtkit *rtk, u64 msg)
{
u8 type = FIELD_GET(APPLE_RTKIT_SYSLOG_TYPE, msg);
switch (type) {
case APPLE_RTKIT_BUFFER_REQUEST:
apple_rtkit_common_rx_get_buffer(rtk, &rtk->ioreport_buffer,
APPLE_RTKIT_EP_IOREPORT, msg);
break;
/* unknown, must be ACKed or the co-processor will hang */
case 0x8:
case 0xc:
apple_rtkit_send_message(rtk, APPLE_RTKIT_EP_IOREPORT, msg,
NULL, false);
break;
default:
dev_warn(rtk->dev, "RTKit: Unknown ioreport message: %llx\n",
msg);
}
}
static void apple_rtkit_syslog_rx_init(struct apple_rtkit *rtk, u64 msg)
{
rtk->syslog_n_entries = FIELD_GET(APPLE_RTKIT_SYSLOG_N_ENTRIES, msg);
rtk->syslog_msg_size = FIELD_GET(APPLE_RTKIT_SYSLOG_MSG_SIZE, msg);
rtk->syslog_msg_buffer = kzalloc(rtk->syslog_msg_size, GFP_KERNEL);
dev_dbg(rtk->dev,
"RTKit: syslog initialized: entries: %zd, msg_size: %zd\n",
rtk->syslog_n_entries, rtk->syslog_msg_size);
}
static void apple_rtkit_syslog_rx_log(struct apple_rtkit *rtk, u64 msg)
{
u8 idx = msg & 0xff;
char log_context[24];
size_t entry_size = 0x20 + rtk->syslog_msg_size;
if (!rtk->syslog_msg_buffer) {
dev_warn(
rtk->dev,
"RTKit: received syslog message but no syslog_msg_buffer\n");
goto done;
}
if (!rtk->syslog_buffer.size) {
dev_warn(
rtk->dev,
"RTKit: received syslog message but syslog_buffer.size is zero\n");
goto done;
}
if (!rtk->syslog_buffer.buffer && !rtk->syslog_buffer.iomem) {
dev_warn(
rtk->dev,
"RTKit: received syslog message but no syslog_buffer.buffer or syslog_buffer.iomem\n");
goto done;
}
if (idx > rtk->syslog_n_entries) {
dev_warn(rtk->dev, "RTKit: syslog index %d out of range\n",
idx);
goto done;
}
apple_rtkit_memcpy(rtk, log_context, &rtk->syslog_buffer,
idx * entry_size + 8, sizeof(log_context));
apple_rtkit_memcpy(rtk, rtk->syslog_msg_buffer, &rtk->syslog_buffer,
idx * entry_size + 8 + sizeof(log_context),
rtk->syslog_msg_size);
log_context[sizeof(log_context) - 1] = 0;
rtk->syslog_msg_buffer[rtk->syslog_msg_size - 1] = 0;
dev_info(rtk->dev, "RTKit: syslog message: %s: %s\n", log_context,
rtk->syslog_msg_buffer);
done:
apple_rtkit_send_message(rtk, APPLE_RTKIT_EP_SYSLOG, msg, NULL, false);
}
static void apple_rtkit_syslog_rx(struct apple_rtkit *rtk, u64 msg)
{
u8 type = FIELD_GET(APPLE_RTKIT_SYSLOG_TYPE, msg);
switch (type) {
case APPLE_RTKIT_BUFFER_REQUEST:
apple_rtkit_common_rx_get_buffer(rtk, &rtk->syslog_buffer,
APPLE_RTKIT_EP_SYSLOG, msg);
break;
case APPLE_RTKIT_SYSLOG_INIT:
apple_rtkit_syslog_rx_init(rtk, msg);
break;
case APPLE_RTKIT_SYSLOG_LOG:
apple_rtkit_syslog_rx_log(rtk, msg);
break;
default:
dev_warn(rtk->dev, "RTKit: Unknown syslog message: %llx\n",
msg);
}
}
static void apple_rtkit_oslog_rx_init(struct apple_rtkit *rtk, u64 msg)
{
u64 ack;
dev_dbg(rtk->dev, "RTKit: oslog init: msg: 0x%llx\n", msg);
ack = FIELD_PREP(APPLE_RTKIT_OSLOG_TYPE, APPLE_RTKIT_OSLOG_ACK);
apple_rtkit_send_message(rtk, APPLE_RTKIT_EP_OSLOG, ack, NULL, false);
}
static void apple_rtkit_oslog_rx(struct apple_rtkit *rtk, u64 msg)
{
u8 type = FIELD_GET(APPLE_RTKIT_OSLOG_TYPE, msg);
switch (type) {
case APPLE_RTKIT_OSLOG_INIT:
apple_rtkit_oslog_rx_init(rtk, msg);
break;
default:
dev_warn(rtk->dev, "RTKit: Unknown oslog message: %llx\n", msg);
}
}
static void apple_rtkit_rx_work(struct work_struct *work)
{
struct apple_rtkit_rx_work *rtk_work =
container_of(work, struct apple_rtkit_rx_work, work);
struct apple_rtkit *rtk = rtk_work->rtk;
switch (rtk_work->ep) {
case APPLE_RTKIT_EP_MGMT:
apple_rtkit_management_rx(rtk, rtk_work->msg);
break;
case APPLE_RTKIT_EP_CRASHLOG:
apple_rtkit_crashlog_rx(rtk, rtk_work->msg);
break;
case APPLE_RTKIT_EP_SYSLOG:
apple_rtkit_syslog_rx(rtk, rtk_work->msg);
break;
case APPLE_RTKIT_EP_IOREPORT:
apple_rtkit_ioreport_rx(rtk, rtk_work->msg);
break;
case APPLE_RTKIT_EP_OSLOG:
apple_rtkit_oslog_rx(rtk, rtk_work->msg);
break;
case APPLE_RTKIT_APP_ENDPOINT_START ... 0xff:
if (rtk->ops->recv_message)
rtk->ops->recv_message(rtk->cookie, rtk_work->ep,
rtk_work->msg);
else
dev_warn(
rtk->dev,
"Received unexpected message to EP%02d: %llx\n",
rtk_work->ep, rtk_work->msg);
break;
default:
dev_warn(rtk->dev,
"RTKit: message to unknown endpoint %02x: %llx\n",
rtk_work->ep, rtk_work->msg);
}
kfree(rtk_work);
}
static void apple_rtkit_rx(struct mbox_client *cl, void *mssg)
{
struct apple_rtkit *rtk = container_of(cl, struct apple_rtkit, mbox_cl);
struct apple_mbox_msg *msg = mssg;
struct apple_rtkit_rx_work *work;
u8 ep = msg->msg1;
/*
* The message was read from a MMIO FIFO and we have to make
* sure all reads from buffers sent with that message happen
* afterwards.
*/
dma_rmb();
if (!test_bit(ep, rtk->endpoints))
dev_warn(rtk->dev,
"RTKit: Message to undiscovered endpoint 0x%02x\n",
ep);
if (ep >= APPLE_RTKIT_APP_ENDPOINT_START &&
rtk->ops->recv_message_early &&
rtk->ops->recv_message_early(rtk->cookie, ep, msg->msg0))
return;
work = kzalloc(sizeof(*work), GFP_ATOMIC);
if (!work)
return;
work->rtk = rtk;
work->ep = ep;
work->msg = msg->msg0;
INIT_WORK(&work->work, apple_rtkit_rx_work);
queue_work(rtk->wq, &work->work);
}
static void apple_rtkit_tx_done(struct mbox_client *cl, void *mssg, int r)
{
struct apple_rtkit_msg *msg =
container_of(mssg, struct apple_rtkit_msg, mbox_msg);
if (r == -ETIME)
return;
if (msg->completion)
complete(msg->completion);
kfree(msg);
}
int apple_rtkit_send_message(struct apple_rtkit *rtk, u8 ep, u64 message,
struct completion *completion, bool atomic)
{
struct apple_rtkit_msg *msg;
int ret;
gfp_t flags;
if (rtk->crashed)
return -EINVAL;
if (ep >= APPLE_RTKIT_APP_ENDPOINT_START &&
!apple_rtkit_is_running(rtk))
return -EINVAL;
if (atomic)
flags = GFP_ATOMIC;
else
flags = GFP_KERNEL;
msg = kzalloc(sizeof(*msg), flags);
if (!msg)
return -ENOMEM;
msg->mbox_msg.msg0 = message;
msg->mbox_msg.msg1 = ep;
msg->completion = completion;
/*
* The message will be sent with a MMIO write. We need the barrier
* here to ensure any previous writes to buffers are visible to the
* device before that MMIO write happens.
*/
dma_wmb();
ret = mbox_send_message(rtk->mbox_chan, &msg->mbox_msg);
if (ret < 0) {
kfree(msg);
return ret;
}
return 0;
}
EXPORT_SYMBOL_GPL(apple_rtkit_send_message);
int apple_rtkit_send_message_wait(struct apple_rtkit *rtk, u8 ep, u64 message,
unsigned long timeout, bool atomic)
{
DECLARE_COMPLETION_ONSTACK(completion);
int ret;
long t;
ret = apple_rtkit_send_message(rtk, ep, message, &completion, atomic);
if (ret < 0)
return ret;
if (atomic) {
ret = mbox_flush(rtk->mbox_chan, timeout);
if (ret < 0)
return ret;
if (try_wait_for_completion(&completion))
return 0;
return -ETIME;
} else {
t = wait_for_completion_interruptible_timeout(
&completion, msecs_to_jiffies(timeout));
if (t < 0)
return t;
else if (t == 0)
return -ETIME;
return 0;
}
}
EXPORT_SYMBOL_GPL(apple_rtkit_send_message_wait);
int apple_rtkit_start_ep(struct apple_rtkit *rtk, u8 endpoint)
{
u64 msg;
if (!test_bit(endpoint, rtk->endpoints))
return -EINVAL;
if (endpoint >= APPLE_RTKIT_APP_ENDPOINT_START &&
!apple_rtkit_is_running(rtk))
return -EINVAL;
msg = FIELD_PREP(APPLE_RTKIT_MGMT_STARTEP_EP, endpoint);
msg |= APPLE_RTKIT_MGMT_STARTEP_FLAG;
apple_rtkit_management_send(rtk, APPLE_RTKIT_MGMT_STARTEP, msg);
return 0;
}
EXPORT_SYMBOL_GPL(apple_rtkit_start_ep);
static int apple_rtkit_request_mbox_chan(struct apple_rtkit *rtk)
{
if (rtk->mbox_name)
rtk->mbox_chan = mbox_request_channel_byname(&rtk->mbox_cl,
rtk->mbox_name);
else
rtk->mbox_chan =
mbox_request_channel(&rtk->mbox_cl, rtk->mbox_idx);
if (IS_ERR(rtk->mbox_chan))
return PTR_ERR(rtk->mbox_chan);
return 0;
}
static struct apple_rtkit *apple_rtkit_init(struct device *dev, void *cookie,
const char *mbox_name, int mbox_idx,
const struct apple_rtkit_ops *ops)
{
struct apple_rtkit *rtk;
int ret;
if (!ops)
return ERR_PTR(-EINVAL);
rtk = kzalloc(sizeof(*rtk), GFP_KERNEL);
if (!rtk)
return ERR_PTR(-ENOMEM);
rtk->dev = dev;
rtk->cookie = cookie;
rtk->ops = ops;
init_completion(&rtk->epmap_completion);
init_completion(&rtk->iop_pwr_ack_completion);
init_completion(&rtk->ap_pwr_ack_completion);
bitmap_zero(rtk->endpoints, APPLE_RTKIT_MAX_ENDPOINTS);
set_bit(APPLE_RTKIT_EP_MGMT, rtk->endpoints);
rtk->mbox_name = mbox_name;
rtk->mbox_idx = mbox_idx;
rtk->mbox_cl.dev = dev;
rtk->mbox_cl.tx_block = false;
rtk->mbox_cl.knows_txdone = false;
rtk->mbox_cl.rx_callback = &apple_rtkit_rx;
rtk->mbox_cl.tx_done = &apple_rtkit_tx_done;
rtk->wq = alloc_ordered_workqueue("rtkit-%s", WQ_MEM_RECLAIM,
dev_name(rtk->dev));
if (!rtk->wq) {
ret = -ENOMEM;
goto free_rtk;
}
ret = apple_rtkit_request_mbox_chan(rtk);
if (ret)
goto destroy_wq;
return rtk;
destroy_wq:
destroy_workqueue(rtk->wq);
free_rtk:
kfree(rtk);
return ERR_PTR(ret);
}
static int apple_rtkit_wait_for_completion(struct completion *c)
{
long t;
t = wait_for_completion_interruptible_timeout(c,
msecs_to_jiffies(1000));
if (t < 0)
return t;
else if (t == 0)
return -ETIME;
else
return 0;
}
int apple_rtkit_reinit(struct apple_rtkit *rtk)
{
/* make sure we don't handle any messages while reinitializing */
mbox_free_channel(rtk->mbox_chan);
flush_workqueue(rtk->wq);
apple_rtkit_free_buffer(rtk, &rtk->ioreport_buffer);
apple_rtkit_free_buffer(rtk, &rtk->crashlog_buffer);
apple_rtkit_free_buffer(rtk, &rtk->syslog_buffer);
kfree(rtk->syslog_msg_buffer);
rtk->syslog_msg_buffer = NULL;
rtk->syslog_n_entries = 0;
rtk->syslog_msg_size = 0;
bitmap_zero(rtk->endpoints, APPLE_RTKIT_MAX_ENDPOINTS);
set_bit(APPLE_RTKIT_EP_MGMT, rtk->endpoints);
reinit_completion(&rtk->epmap_completion);
reinit_completion(&rtk->iop_pwr_ack_completion);
reinit_completion(&rtk->ap_pwr_ack_completion);
rtk->crashed = false;
rtk->iop_power_state = APPLE_RTKIT_PWR_STATE_OFF;
rtk->ap_power_state = APPLE_RTKIT_PWR_STATE_OFF;
return apple_rtkit_request_mbox_chan(rtk);
}
EXPORT_SYMBOL_GPL(apple_rtkit_reinit);
static int apple_rtkit_set_ap_power_state(struct apple_rtkit *rtk,
unsigned int state)
{
u64 msg;
int ret;
reinit_completion(&rtk->ap_pwr_ack_completion);
msg = FIELD_PREP(APPLE_RTKIT_MGMT_PWR_STATE, state);
apple_rtkit_management_send(rtk, APPLE_RTKIT_MGMT_SET_AP_PWR_STATE,
msg);
ret = apple_rtkit_wait_for_completion(&rtk->ap_pwr_ack_completion);
if (ret)
return ret;
if (rtk->ap_power_state != state)
return -EINVAL;
return 0;
}
static int apple_rtkit_set_iop_power_state(struct apple_rtkit *rtk,
unsigned int state)
{
u64 msg;
int ret;
reinit_completion(&rtk->iop_pwr_ack_completion);
msg = FIELD_PREP(APPLE_RTKIT_MGMT_PWR_STATE, state);
apple_rtkit_management_send(rtk, APPLE_RTKIT_MGMT_SET_IOP_PWR_STATE,
msg);
ret = apple_rtkit_wait_for_completion(&rtk->iop_pwr_ack_completion);
if (ret)
return ret;
if (rtk->iop_power_state != state)
return -EINVAL;
return 0;
}
int apple_rtkit_boot(struct apple_rtkit *rtk)
{
int ret;
if (apple_rtkit_is_running(rtk))
return 0;
if (rtk->crashed)
return -EINVAL;
dev_dbg(rtk->dev, "RTKit: waiting for boot to finish\n");
ret = apple_rtkit_wait_for_completion(&rtk->epmap_completion);
if (ret)
return ret;
if (rtk->boot_result)
return rtk->boot_result;
dev_dbg(rtk->dev, "RTKit: waiting for IOP power state ACK\n");
ret = apple_rtkit_wait_for_completion(&rtk->iop_pwr_ack_completion);
if (ret)
return ret;
return apple_rtkit_set_ap_power_state(rtk, APPLE_RTKIT_PWR_STATE_ON);
}
EXPORT_SYMBOL_GPL(apple_rtkit_boot);
int apple_rtkit_shutdown(struct apple_rtkit *rtk)
{
int ret;
/* if OFF is used here the co-processor will not wake up again */
ret = apple_rtkit_set_ap_power_state(rtk,
APPLE_RTKIT_PWR_STATE_QUIESCED);
if (ret)
return ret;
ret = apple_rtkit_set_iop_power_state(rtk, APPLE_RTKIT_PWR_STATE_SLEEP);
if (ret)
return ret;
return apple_rtkit_reinit(rtk);
}
EXPORT_SYMBOL_GPL(apple_rtkit_shutdown);
int apple_rtkit_quiesce(struct apple_rtkit *rtk)
{
int ret;
ret = apple_rtkit_set_ap_power_state(rtk,
APPLE_RTKIT_PWR_STATE_QUIESCED);
if (ret)
return ret;
ret = apple_rtkit_set_iop_power_state(rtk,
APPLE_RTKIT_PWR_STATE_QUIESCED);
if (ret)
return ret;
ret = apple_rtkit_reinit(rtk);
if (ret)
return ret;
rtk->iop_power_state = APPLE_RTKIT_PWR_STATE_QUIESCED;
rtk->ap_power_state = APPLE_RTKIT_PWR_STATE_QUIESCED;
return 0;
}
EXPORT_SYMBOL_GPL(apple_rtkit_quiesce);
int apple_rtkit_wake(struct apple_rtkit *rtk)
{
u64 msg;
if (apple_rtkit_is_running(rtk))
return -EINVAL;
reinit_completion(&rtk->iop_pwr_ack_completion);
/*
* Use open-coded apple_rtkit_set_iop_power_state since apple_rtkit_boot
* will wait for the completion anyway.
*/
msg = FIELD_PREP(APPLE_RTKIT_MGMT_PWR_STATE, APPLE_RTKIT_PWR_STATE_ON);
apple_rtkit_management_send(rtk, APPLE_RTKIT_MGMT_SET_IOP_PWR_STATE,
msg);
return apple_rtkit_boot(rtk);
}
EXPORT_SYMBOL_GPL(apple_rtkit_wake);
static void apple_rtkit_free(struct apple_rtkit *rtk)
{
mbox_free_channel(rtk->mbox_chan);
destroy_workqueue(rtk->wq);
apple_rtkit_free_buffer(rtk, &rtk->ioreport_buffer);
apple_rtkit_free_buffer(rtk, &rtk->crashlog_buffer);
apple_rtkit_free_buffer(rtk, &rtk->syslog_buffer);
kfree(rtk->syslog_msg_buffer);
kfree(rtk);
}
struct apple_rtkit *devm_apple_rtkit_init(struct device *dev, void *cookie,
const char *mbox_name, int mbox_idx,
const struct apple_rtkit_ops *ops)
{
struct apple_rtkit *rtk;
int ret;
rtk = apple_rtkit_init(dev, cookie, mbox_name, mbox_idx, ops);
if (IS_ERR(rtk))
return rtk;
ret = devm_add_action_or_reset(dev, (void (*)(void *))apple_rtkit_free,
rtk);
if (ret)
return ERR_PTR(ret);
return rtk;
}
EXPORT_SYMBOL_GPL(devm_apple_rtkit_init);
MODULE_LICENSE("Dual MIT/GPL");
MODULE_AUTHOR("Sven Peter <sven@svenpeter.dev>");
MODULE_DESCRIPTION("Apple RTKit driver");
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