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android_kernel_samsung_on5x.../drivers/misc/samsung/scsc/mxman.c
awab228 f6dfaef42e Fixed MTP to work with TWRP
2018-06-19 23:16:04 +02:00

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/****************************************************************************
*
* Copyright (c) 2014 - 2016 Samsung Electronics Co., Ltd. All rights reserved
*
****************************************************************************/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/firmware.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/version.h>
#include "scsc_mx_impl.h"
#include "miframman.h"
#include "mifmboxman.h"
#include "mxman.h"
#include "srvman.h"
#include "mxmgmt_transport.h"
#include "gdb_transport.h"
#include "mxconf.h"
#include "fwimage.h"
#include "fwhdr.h"
#include "mxlog.h"
#include "fw_panic_record.h"
#include "mxproc.h"
#include "mxlog_transport.h"
#include <scsc/kic/slsi_kic_lib.h>
#include <scsc/scsc_release.h>
#include "scsc_mx.h"
#include <linux/fs.h>
#include <scsc/scsc_logring.h>
#define STRING_BUFFER_MAX_LENGTH 128
#define NUMBER_OF_STRING_ARGS 1
#define MX_DRAM_SIZE (4 * 1024 * 1024)
#define MX_FW_RUNTIME_LENGTH (1024 * 1024)
#define WAIT_FOR_FW_TO_START_DELAY_MS 1000
#define MBOX2_MAGIC_NUMBER 0xbcdeedcb
#define MBOX_INDEX_0 0
#define MBOX_INDEX_1 1
#define MBOX_INDEX_2 2
#define MBOX_INDEX_3 3
#define MBOX_INDEX_4 4
#define MBOX_INDEX_5 5
#define MBOX_INDEX_6 6
#define MBOX_INDEX_7 7
static bool allow_unidentified_firmware;
module_param(allow_unidentified_firmware, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(allow_unidentified_firmware, "Allow unidentified firmware");
static bool skip_header;
module_param(skip_header, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(skip_header, "Skip header, assuming unidentified firmware");
static bool crc_check_allow_none = true;
module_param(crc_check_allow_none, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(crc_check_allow_none, "Allow skipping firmware CRC checks if CRC is not present");
static int crc_check_period_ms = 30000;
module_param(crc_check_period_ms, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(crc_check_period_ms, "Time period for checking the firmware CRCs");
static ulong mm_completion_timeout_ms = 2000;
module_param(mm_completion_timeout_ms, ulong, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(mm_completion_timeout_ms, "Timeout wait_for_mm_msg_start_ind (ms) - default 1000. 0 = infinite");
static bool skip_mbox0_check;
module_param(skip_mbox0_check, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(skip_mbox0_check, "Allow skipping firmware mbox0 signature check");
static uint mif_access_max_time_ms = 100;
module_param(mif_access_max_time_ms, uint, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(mif_access_max_time_ms, "Timeout send_mm_msg_stop_blocking (ms) - default 100");
static uint firmware_startup_flags;
module_param(firmware_startup_flags, uint, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(firmware_startup_flags, "0 = Proceed as normal (default); Bit 0 = 1 - spin at start of CRT0; Other bits reserved = 0");
#ifdef CONFIG_SCSC_CHV_SUPPORT
/* First arg controls chv function */
int chv_run;
module_param(chv_run, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(chv_run, "Run chv f/w: 0 = feature disabled, 1 = for continuous checking, 2 = 1 shot, anything else, undefined");
/* Optional array of args for firmware to interpret when chv_run = 1 */
static unsigned int chv_argv[32];
static int chv_argc;
module_param_array(chv_argv, uint, &chv_argc, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(chv_argv, "Array of up to 32 x u32 args for the CHV firmware when chv_run = 1");
#endif
static bool disable_auto_coredump;
module_param(disable_auto_coredump, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(disable_auto_coredump, "Disable driver automatic coredump");
static bool disable_error_handling;
module_param(disable_error_handling, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(disable_error_handling, "Disable error handling");
static bool disable_recovery_handling;
module_param(disable_recovery_handling, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(disable_recovery_handling, "Disable recovery handling");
static uint panic_record_delay = 1;
module_param(panic_record_delay, uint, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(panic_record_delay, "Delay in ms before accessing the panic record");
static bool disable_logger = true;
module_param(disable_logger, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(disable_logger, "Disable launch of user space logger");
/**
* Maxwell Agent Management Messages.
*
* TODO: common defn with firmware, generated.
*
* The numbers here *must* match the firmware!
*/
enum {
MM_START_IND = 0,
MM_HALT_REQ = 1,
MM_FORCE_PANIC = 2,
MM_HOST_SUSPEND = 3,
MM_HOST_RESUME = 4
} ma_msg;
/**
* Format of the Maxwell agent messages
* on the Maxwell management transport stream.
*/
struct ma_msg_packet {
uint8_t ma_msg; /* Message from ma_msg enum */
uint32_t arg; /* Optional arg set by f/w in some to-host messages */
} __packed;
static void mxman_stop(struct mxman *mxman);
static void print_mailboxes(struct mxman *mxman);
static int _mx_exec(char *prog, int wait_exec);
#ifndef MAXWELL_SKIP_MANAGER
static int wait_for_mm_msg_start_ind(struct mxman *mxman)
{
int r;
if (0 == mm_completion_timeout_ms) {
/* Zero implies infinite wait */
r = wait_for_completion_interruptible(&mxman->mm_msg_start_ind_completion);
/* r = -ERESTARTSYS if interrupted, 0 if completed */
return r;
}
r = wait_for_completion_timeout(&mxman->mm_msg_start_ind_completion, msecs_to_jiffies(mm_completion_timeout_ms));
if (r == 0) {
SCSC_TAG_ERR(MXMAN, "timeout\n");
return -ETIMEDOUT;
}
return 0;
}
#endif
static int coredump_helper(void)
{
int r;
int i;
slsi_kic_system_event(slsi_kic_system_event_category_recovery,
slsi_kic_system_events_coredump_in_progress, GFP_KERNEL);
for (i = 0; i < 20; i++) {
r = _mx_exec("/system/bin/moredump", UMH_WAIT_PROC);
if (r != -EBUSY)
break;
/* If the usermode helper fails with -EBUSY, the userspace is
* likely still frozen from suspend. Back off and retry.
*/
SCSC_TAG_INFO(MXMAN, "waiting for userspace to thaw...\n");
msleep(1000);
}
/* Application return codes are in the MSB */
if (r > 0xffL)
SCSC_TAG_INFO(MXMAN, "moredump.bin exit(%ld), check syslog\n", (r & 0xff00L) >> 8);
if (r >= 0) {
slsi_kic_system_event(slsi_kic_system_event_category_recovery,
slsi_kic_system_events_coredump_done, GFP_KERNEL);
}
return r;
}
static int send_mm_msg_stop_blocking(struct mxman *mxman)
{
struct ma_msg_packet message = { .ma_msg = MM_HALT_REQ };
mxmgmt_transport_send(scsc_mx_get_mxmgmt_transport(mxman->mx), MMTRANS_CHAN_ID_MAXWELL_MANAGEMENT, &message, sizeof(message));
msleep(mif_access_max_time_ms);
return 0;
}
#ifndef MAXWELL_SKIP_MANAGER
/** Receive handler for messages from the FW along the maxwell management transport */
static void mxman_message_handler(const void *message, void *data)
{
struct mxman *mxman = (struct mxman *)data;
/* Forward the message to the applicable service to deal with */
const struct ma_msg_packet *msg = message;
switch (msg->ma_msg) {
case MM_START_IND:
/* The arg can be used to determine the WLBT/S610 hardware revision */
SCSC_TAG_INFO(MXMAN, "Received MM_START_IND message from the firmware, arg=0x%04x\n", msg->arg);
mxman->rf_hw_ver = msg->arg;
complete(&mxman->mm_msg_start_ind_completion);
break;
default:
/* HERE: Unknown message, raise fault */
SCSC_TAG_WARNING(MXMAN, "Received unknown message from the firmware: msg->ma_msg=%d\n", msg->ma_msg);
break;
}
}
#endif
/*
* This function calulates and checks two or three (depending on crc32_over_binary flag)
* crc32 values in the firmware header. The function will check crc32 over the firmware binary
* (i.e. everything in the file following the header) only if the crc32_over_binary is set to 'true'.
* This includes initialised data regions so it can be used to check when loading but will not be
* meaningful once execution starts.
*/
static int do_fw_crc32_checks(char *fw, u32 fw_image_size, struct fwhdr *fwhdr, bool crc32_over_binary)
{
int r;
if ((fwhdr->fw_crc32 == 0 || fwhdr->header_crc32 == 0 || fwhdr->const_crc32 == 0) && crc_check_allow_none == 0) {
SCSC_TAG_ERR(MXMAN, "error: CRC is missing fw_crc32=%d header_crc32=%d crc_check_allow_none=%d\n",
fwhdr->fw_crc32, fwhdr->header_crc32, crc_check_allow_none);
return -EINVAL;
}
if (fwhdr->header_crc32 == 0 && crc_check_allow_none == 1) {
SCSC_TAG_INFO(MXMAN, "Skipping CRC check header_crc32=%d crc_check_allow_none=%d\n",
fwhdr->header_crc32, crc_check_allow_none);
} else {
/*
* CRC-32-IEEE of all preceding header fields (including other CRCs).
* Always the last word in the header.
*/
r = fwimage_check_fw_header_crc(fw, fwhdr->hdr_length, fwhdr->header_crc32);
if (r) {
SCSC_TAG_ERR(MXMAN, "fwimage_check_fw_header_crc() failed\n");
return r;
}
}
if (fwhdr->const_crc32 == 0 && crc_check_allow_none == 1) {
SCSC_TAG_INFO(MXMAN, "Skipping CRC check const_crc32=%d crc_check_allow_none=%d\n",
fwhdr->const_crc32, crc_check_allow_none);
} else {
/*
* CRC-32-IEEE over the constant sections grouped together at start of firmware binary.
* This CRC should remain valid during execution. It can be used by run-time checker on
* host to detect firmware corruption (not all memory masters are subject to MPUs).
*/
r = fwimage_check_fw_const_section_crc(fw, fwhdr->const_crc32, fwhdr->const_fw_length, fwhdr->hdr_length);
if (r) {
SCSC_TAG_ERR(MXMAN, "fwimage_check_fw_const_section_crc() failed\n");
return r;
}
}
if (crc32_over_binary) {
if (fwhdr->fw_crc32 == 0 && crc_check_allow_none == 1)
SCSC_TAG_INFO(MXMAN, "Skipping CRC check fw_crc32=%d crc_check_allow_none=%d\n",
fwhdr->fw_crc32, crc_check_allow_none);
else {
/*
* CRC-32-IEEE over the firmware binary (i.e. everything
* in the file following this header).
* This includes initialised data regions so it can be used to
* check when loading but will not be meaningful once execution starts.
*/
r = fwimage_check_fw_crc(fw, fw_image_size, fwhdr->hdr_length, fwhdr->fw_crc32);
if (r) {
SCSC_TAG_ERR(MXMAN, "fwimage_check_fw_crc() failed\n");
return r;
}
}
}
return 0;
}
static void fw_crc_wq_start(struct mxman *mxman)
{
if (mxman->check_crc && crc_check_period_ms)
queue_delayed_work(mxman->fw_crc_wq, &mxman->fw_crc_work, msecs_to_jiffies(crc_check_period_ms));
}
static void fw_crc_work_func(struct work_struct *work)
{
int r;
struct mxman *mxman = container_of((struct delayed_work *)work, struct mxman, fw_crc_work);
r = do_fw_crc32_checks(mxman->fw, mxman->fw_image_size, &mxman->fwhdr, false);
if (r) {
SCSC_TAG_ERR(MXMAN, "do_fw_crc32_checks() failed r=%d\n", r);
mxman_fail(mxman, SCSC_PANIC_CODE_HOST << 15);
return;
}
fw_crc_wq_start(mxman);
}
static void fw_crc_wq_init(struct mxman *mxman)
{
mxman->fw_crc_wq = create_singlethread_workqueue("fw_crc_wq");
INIT_DELAYED_WORK(&mxman->fw_crc_work, fw_crc_work_func);
}
static void fw_crc_wq_stop(struct mxman *mxman)
{
mxman->check_crc = false;
cancel_delayed_work(&mxman->fw_crc_work);
flush_workqueue(mxman->fw_crc_wq);
}
static void fw_crc_wq_deinit(struct mxman *mxman)
{
fw_crc_wq_stop(mxman);
destroy_workqueue(mxman->fw_crc_wq);
}
static int transports_init(struct mxman *mxman)
{
struct mxconf *mxconf;
int r;
struct scsc_mx *mx = mxman->mx;
/* Initialise mx management stack */
r = mxmgmt_transport_init(scsc_mx_get_mxmgmt_transport(mx), mx);
if (r) {
SCSC_TAG_ERR(MXMAN, "mxmgmt_transport_init() failed\n");
return r;
}
/* Initialise gdb transport for cortex-R4 */
r = gdb_transport_init(scsc_mx_get_gdb_transport_r4(mx), mx, GDB_TRANSPORT_R4);
if (r) {
SCSC_TAG_ERR(MXMAN, "gdb_transport_init() failed\n");
mxmgmt_transport_release(scsc_mx_get_mxmgmt_transport(mx));
return r;
}
/* Initialise gdb transport for cortex-M4 */
r = gdb_transport_init(scsc_mx_get_gdb_transport_m4(mx), mx, GDB_TRANSPORT_M4);
if (r) {
SCSC_TAG_ERR(MXMAN, "gdb_transport_init() failed\n");
gdb_transport_release(scsc_mx_get_gdb_transport_r4(mx));
mxmgmt_transport_release(scsc_mx_get_mxmgmt_transport(mx));
return r;
}
/* Initialise mxlog transport */
r = mxlog_transport_init(scsc_mx_get_mxlog_transport(mx), mx);
if (r) {
SCSC_TAG_ERR(MXMAN, "mxlog_transport_init() failed\n");
gdb_transport_release(scsc_mx_get_gdb_transport_m4(mx));
gdb_transport_release(scsc_mx_get_gdb_transport_r4(mx));
mxmgmt_transport_release(scsc_mx_get_mxmgmt_transport(mx));
return r;
}
/*
* Allocate & Initialise Infrastructre Config Structure
* including the mx management stack config information.
*/
mxconf = miframman_alloc(scsc_mx_get_ramman(mx), sizeof(struct mxconf), 4);
if (!mxconf) {
SCSC_TAG_ERR(MXMAN, "miframman_alloc() failed\n");
gdb_transport_release(scsc_mx_get_gdb_transport_m4(mx));
gdb_transport_release(scsc_mx_get_gdb_transport_r4(mx));
mxmgmt_transport_release(scsc_mx_get_mxmgmt_transport(mx));
mxlog_transport_release(scsc_mx_get_mxlog_transport(mx));
return -ENOMEM;
}
mxman->mxconf = mxconf;
mxconf->magic = MXCONF_MAGIC;
mxconf->version.major = MXCONF_VERSION_MAJOR;
mxconf->version.minor = MXCONF_VERSION_MINOR;
/* serialise mxmgmt transport */
mxmgmt_transport_config_serialise(scsc_mx_get_mxmgmt_transport(mx), &mxconf->mx_trans_conf);
/* serialise Cortex-R4 gdb transport */
gdb_transport_config_serialise(scsc_mx_get_gdb_transport_r4(mx), &mxconf->mx_trans_conf_gdb_r4);
/* serialise Cortex-M4 gdb transport */
gdb_transport_config_serialise(scsc_mx_get_gdb_transport_m4(mx), &mxconf->mx_trans_conf_gdb_m4);
/* serialise mxlog transport */
mxlog_transport_config_serialise(scsc_mx_get_mxlog_transport(mx), &mxconf->mxlogconf);
SCSC_TAG_DEBUG(MXMAN, "read_bit_idx=%d write_bit_idx=%d buffer=%p num_packets=%d packet_size=%d read_index=%d write_index=%d\n",
scsc_mx_get_mxlog_transport(mx)->mif_stream.read_bit_idx,
scsc_mx_get_mxlog_transport(mx)->mif_stream.write_bit_idx,
scsc_mx_get_mxlog_transport(mx)->mif_stream.buffer.buffer,
scsc_mx_get_mxlog_transport(mx)->mif_stream.buffer.num_packets,
scsc_mx_get_mxlog_transport(mx)->mif_stream.buffer.packet_size,
*scsc_mx_get_mxlog_transport(mx)->mif_stream.buffer.read_index,
*scsc_mx_get_mxlog_transport(mx)->mif_stream.buffer.write_index
);
return 0;
}
static void transports_release(struct mxman *mxman)
{
#ifndef MAXWELL_SKIP_MANAGER
mxlog_transport_release(scsc_mx_get_mxlog_transport(mxman->mx));
mxmgmt_transport_release(scsc_mx_get_mxmgmt_transport(mxman->mx));
gdb_transport_release(scsc_mx_get_gdb_transport_r4(mxman->mx));
gdb_transport_release(scsc_mx_get_gdb_transport_m4(mxman->mx));
#endif
miframman_free(scsc_mx_get_ramman(mxman->mx), mxman->mxconf);
}
static void mbox_init(struct mxman *mxman, u32 firmware_entry_point)
{
u32 *mbox0;
u32 *mbox1;
u32 *mbox2;
u32 *mbox3;
scsc_mifram_ref mifram_ref;
struct scsc_mx *mx = mxman->mx;
struct scsc_mif_abs *mif = scsc_mx_get_mif_abs(mxman->mx);
/* Place firmware entry address in MIF MBOX 0 so R4 ROM knows where to jump to! */
mbox0 = mifmboxman_get_mbox_ptr(scsc_mx_get_mboxman(mx), mif, MBOX_INDEX_0);
mbox1 = mifmboxman_get_mbox_ptr(scsc_mx_get_mboxman(mx), mif, MBOX_INDEX_1);
/* Write (and flush) entry point to MailBox 0, config address to MBOX 1 */
*mbox0 = firmware_entry_point;
mif->get_mifram_ref(mif, mxman->mxconf, &mifram_ref);
*mbox1 = mifram_ref; /* must be R4-relative address here */
/* CPU memory barrier */
wmb();
/*
* write the magic number "0xbcdeedcb" to MIF Mailbox #2 &
* copy the firmware_startup_flags to MIF Mailbox #3 before starting (reset = 0) the R4
*/
mbox2 = mifmboxman_get_mbox_ptr(scsc_mx_get_mboxman(mx), mif, MBOX_INDEX_2);
*mbox2 = MBOX2_MAGIC_NUMBER;
mbox3 = mifmboxman_get_mbox_ptr(scsc_mx_get_mboxman(mx), mif, MBOX_INDEX_3);
*mbox3 = firmware_startup_flags;
}
static int fwhdr_init(char *fw, struct fwhdr *fwhdr, bool *fwhdr_parsed_ok, bool *check_crc)
{
/*
* Validate the fw image including checking the firmware header, majic #, version, checksum so on
* then do CRC on the entire image
*
* Derive some values from header -
*
* PORT: assumes little endian
*/
if (skip_header)
*fwhdr_parsed_ok = false; /* Allows the forced start address to be used */
else
*fwhdr_parsed_ok = fwhdr_parse(fw, fwhdr);
*check_crc = false;
if (*fwhdr_parsed_ok) {
SCSC_TAG_INFO(MXMAN, "FW HEADER version: hdr_major: %d hdr_minor: %d\n", fwhdr->hdr_major, fwhdr->hdr_minor);
switch (fwhdr->hdr_major) {
case 0:
switch (fwhdr->hdr_minor) {
case 2:
*check_crc = true;
break;
default:
SCSC_TAG_ERR(MXMAN, "Unsupported FW HEADER version: hdr_major: %d hdr_minor: %d\n",
fwhdr->hdr_major, fwhdr->hdr_minor);
return -EINVAL;
}
break;
case 1:
*check_crc = true;
break;
default:
SCSC_TAG_ERR(MXMAN, "Unsupported FW HEADER version: hdr_major: %d hdr_minor: %d\n",
fwhdr->hdr_major, fwhdr->hdr_minor);
return -EINVAL;
}
switch (fwhdr->fwapi_major) {
case 0:
switch (fwhdr->fwapi_minor) {
case 2:
SCSC_TAG_INFO(MXMAN, "FWAPI version: fwapi_major: %d fwapi_minor: %d\n",
fwhdr->fwapi_major, fwhdr->fwapi_minor);
break;
default:
SCSC_TAG_ERR(MXMAN, "Unsupported FWAPI version: fwapi_major: %d fwapi_minor: %d\n",
fwhdr->fwapi_major, fwhdr->fwapi_minor);
return -EINVAL;
}
break;
default:
SCSC_TAG_ERR(MXMAN, "Unsupported FWAPI version: fwapi_major: %d fwapi_minor: %d\n",
fwhdr->fwapi_major, fwhdr->fwapi_minor);
return -EINVAL;
}
} else {
/* This is unidetified pre-header firmware - assume it is built to run at 0xb8000000 == 0 for bootrom */
if (allow_unidentified_firmware) {
SCSC_TAG_INFO(MXMAN, "Unidentified firmware override\n");
fwhdr->firmware_entry_point = 0;
fwhdr->fw_runtime_length = MX_FW_RUNTIME_LENGTH;
} else {
SCSC_TAG_ERR(MXMAN, "Unidentified firmware is not allowed\n");
return -EINVAL;
}
}
return 0;
}
static void write_mcd_test_fw_version_file(struct mxman *mxman)
{
struct file *fp = NULL;
char *filepath = "/data/.wifiver.info";
char buf[80];
char *build_id = 0;
if (mxman)
build_id = mxman->fw_build_id;
fp = filp_open(filepath, O_WRONLY|O_CREAT, 0644);
if (IS_ERR(fp)) {
pr_err("returned error %d\n", IS_ERR(fp));
return;
} else if (fp == NULL) {
pr_err("%s doesn't exist.\n", filepath);
return;
}
snprintf(buf, sizeof(buf), "drv_ver: %d.%d.%d (f/w: %s)\n",
SCSC_RELEASE_PRODUCT, SCSC_RELEASE_ITERATION, SCSC_RELEASE_CANDIDATE,
build_id ? build_id : "unknown");
kernel_write(fp, buf, strlen(buf), 0);
if (fp)
filp_close(fp, NULL);
}
static int fw_init(struct mxman *mxman, void *start_dram, size_t size_dram, bool *fwhdr_parsed_ok)
{
int r;
char *build_id;
u32 fw_image_size;
struct fwhdr *fwhdr = &mxman->fwhdr;
char *fw = start_dram;
r = mx140_file_download_fw(mxman->mx, start_dram, size_dram, &fw_image_size);
if (r) {
SCSC_TAG_ERR(MXMAN, "mx140_file_download_fw() failed (%d)\n", r);
return r;
}
r = fwhdr_init(fw, fwhdr, fwhdr_parsed_ok, &mxman->check_crc);
if (r) {
SCSC_TAG_ERR(MXMAN, "fwhdr_init() failed\n");
return r;
}
mxman->fw = fw;
mxman->fw_image_size = fw_image_size;
if (mxman->check_crc) {
/* do CRC on the entire image */
r = do_fw_crc32_checks(fw, fw_image_size, &mxman->fwhdr, true);
if (r) {
SCSC_TAG_ERR(MXMAN, "do_fw_crc32_checks() failed\n");
return r;
}
fw_crc_wq_start(mxman);
}
if (*fwhdr_parsed_ok) {
build_id = fwhdr_get_build_id(fw, fwhdr);
if (build_id) {
struct slsi_kic_service_info kic_info;
(void)snprintf(mxman->fw_build_id, sizeof(mxman->fw_build_id), "%s", build_id);
SCSC_TAG_INFO(MXMAN, "Firmware BUILD_ID: %s\n", mxman->fw_build_id);
(void) snprintf(kic_info.ver_str,
min(sizeof(mxman->fw_build_id), sizeof(kic_info.ver_str)),
"%s", mxman->fw_build_id);
kic_info.fw_api_major = fwhdr->fwapi_major;
kic_info.fw_api_minor = fwhdr->fwapi_minor;
kic_info.release_product = SCSC_RELEASE_PRODUCT;
kic_info.host_release_iteration = SCSC_RELEASE_ITERATION;
kic_info.host_release_candidate = SCSC_RELEASE_CANDIDATE;
slsi_kic_service_information(slsi_kic_technology_type_common, &kic_info);
} else
SCSC_TAG_ERR(MXMAN, "Failed to get Firmware BUILD_ID\n");
}
SCSC_TAG_DEBUG(MXMAN, "firmware_entry_point=0x%x fw_runtime_length=%d\n", fwhdr->firmware_entry_point, fwhdr->fw_runtime_length);
/* write /data/.wifiver.info if MCD *#2633# is requested. */
write_mcd_test_fw_version_file(mxman);
return 0;
}
static int mxman_start(struct mxman *mxman)
{
void *start_dram;
size_t size_dram = MX_DRAM_SIZE;
struct scsc_mif_abs *mif;
struct fwhdr *fwhdr = &mxman->fwhdr;
bool fwhdr_parsed_ok;
#ifndef MAXWELL_SKIP_MANAGER
void *start_mifram_heap;
u32 length_mifram_heap;
int r;
#endif
(void)snprintf(mxman->fw_build_id, sizeof(mxman->fw_build_id), "unknown");
/* If the option is set to skip header, we must allow unidentified f/w */
if (skip_header) {
SCSC_TAG_INFO(MXMAN, "Ignoring firmware header block\n");
allow_unidentified_firmware = true;
}
mif = scsc_mx_get_mif_abs(mxman->mx);
start_dram = mif->map(mif, &size_dram);
if (!start_dram) {
SCSC_TAG_ERR(MXMAN, "Error allocating dram\n");
return -ENOMEM;
}
SCSC_TAG_DEBUG(MXMAN, "Allocated %zu bytes\n", size_dram);
#ifdef CONFIG_SCSC_CHV_SUPPORT
if (chv_run)
allow_unidentified_firmware = true;
/* Set up chv arguments. */
#endif
#ifndef MAXWELL_SKIP_MANAGER
mxman->start_dram = start_dram;
r = fw_init(mxman, start_dram, size_dram, &fwhdr_parsed_ok);
if (r) {
SCSC_TAG_ERR(MXMAN, "fw_init() failed\n");
mif->unmap(mif, mxman->start_dram);
return r;
}
/* set up memory protection (read only) from start_dram to start_dram+fw_length
* rounding up the size if required
*/
start_mifram_heap = (char *)start_dram + fwhdr->fw_runtime_length;
length_mifram_heap = size_dram - fwhdr->fw_runtime_length;
miframman_init(scsc_mx_get_ramman(mxman->mx), start_mifram_heap, length_mifram_heap);
mifmboxman_init(scsc_mx_get_mboxman(mxman->mx));
mifintrbit_init(scsc_mx_get_intrbit(mxman->mx), mif);
#else
miframman_init(scsc_mx_get_ramman(mxman->mx), start_dram, size_dram);
#endif
#ifndef MAXWELL_SKIP_MANAGER
/* Initialise transports */
r = transports_init(mxman);
if (r) {
SCSC_TAG_ERR(MXMAN, "transports_init() failed\n");
fw_crc_wq_stop(mxman);
mifintrbit_deinit(scsc_mx_get_intrbit(mxman->mx));
miframman_deinit(scsc_mx_get_ramman(mxman->mx));
mifmboxman_deinit(scsc_mx_get_mboxman(mxman->mx));
/* Release the MIF memory resources */
mif->unmap(mif, mxman->start_dram);
return r;
}
mbox_init(mxman, fwhdr->firmware_entry_point);
init_completion(&mxman->mm_msg_start_ind_completion);
mxmgmt_transport_register_channel_handler(scsc_mx_get_mxmgmt_transport(mxman->mx), MMTRANS_CHAN_ID_MAXWELL_MANAGEMENT,
&mxman_message_handler, mxman);
mxlog_init(scsc_mx_get_mxlog(mxman->mx), mxman->mx);
#endif
#ifdef CONFIG_SCSC_CHV_SUPPORT
if (chv_run) {
int i;
u32 *p = (u32 *)((u8 *)start_dram + SCSC_CHV_ARGV_ADDR_OFFSET);
if (chv_argc == 0) {
/*
* Setup the chv f/w arguments.
* Argument of 0 means run once (driver never set this).
* Argument of 1 means run forever.
*/
SCSC_TAG_INFO(MXMAN, "Setting up CHV arguments: start_dram=%p arg=%p, chv_run=%d\n", start_dram, p, chv_run);
*p++ = 1; /* argc */
*p++ = chv_run == 1 ? 0 : 1; /* arg */
} else {
/* Pass separate args */
*p++ = chv_argc; /* argc */
SCSC_TAG_INFO(MXMAN, "Setting up additional CHV args: chv_argc = %d\n", chv_argc);
for (i = 0; i < chv_argc; i++) {
SCSC_TAG_INFO(MXMAN, "Setting up additional CHV args: chv_argv[%d]: *(%p) = 0x%x\n", i, p, (u32)chv_argv[i]);
*p++ = (u32)chv_argv[i]; /* arg */
}
}
}
#endif
mxproc_create_ctrl_proc_dir(&mxman->mxproc, mxman);
/* release Maxwell from reset */
mif->reset(mif, 0);
#ifndef MAXWELL_SKIP_MANAGER
if (fwhdr_parsed_ok) {
r = wait_for_mm_msg_start_ind(mxman);
if (r) {
SCSC_TAG_ERR(MXMAN, "wait_for_MM_START_IND() failed: r=%d\n", r);
print_mailboxes(mxman);
if (skip_mbox0_check) {
SCSC_TAG_ERR(MXMAN, "timeout ignored in skip_mbox0_check mode\n");
return 0;
}
mxman_stop(mxman);
return r;
}
} else {
msleep(WAIT_FOR_FW_TO_START_DELAY_MS);
}
#endif
return 0;
}
/*
* workqueue thread
*/
static void mxman_failure_work(struct work_struct *work)
{
struct mxman *mxman = container_of(work, struct mxman, failure_work);
struct srvman *srvman;
struct scsc_mx *mx = mxman->mx;
struct scsc_mif_abs *mif = scsc_mx_get_mif_abs(mxman->mx);
u16 scsc_panic_code;
wake_lock(&mxman->recovery_wake_lock);
slsi_kic_system_event(slsi_kic_system_event_category_error,
slsi_kic_system_events_subsystem_crashed, GFP_KERNEL);
SCSC_TAG_INFO(MXMAN, "Complete mm_msg_start_ind_completion\n");
complete(&mxman->mm_msg_start_ind_completion);
mutex_lock(&mxman->mxman_mutex);
srvman = scsc_mx_get_srvman(mxman->mx);
if (mxman->mxman_state != MXMAN_STATE_STARTED) {
SCSC_TAG_WARNING(MXMAN, "Not in started state: mxman->mxman_state=%d\n", mxman->mxman_state);
wake_unlock(&mxman->recovery_wake_lock);
mutex_unlock(&mxman->mxman_mutex);
return;
}
scsc_panic_code = mxman->scsc_panic_code;
mxlog_release(scsc_mx_get_mxlog(mx));
/* unregister channel handler */
mxmgmt_transport_register_channel_handler(scsc_mx_get_mxmgmt_transport(mx), MMTRANS_CHAN_ID_MAXWELL_MANAGEMENT,
NULL, NULL);
mxmgmt_transport_set_error(scsc_mx_get_mxmgmt_transport(mx));
srvman_set_error(srvman);
fw_crc_wq_stop(mxman);
mxman->mxman_state = mxman->mxman_next_state;
if (mxman->mxman_state != MXMAN_STATE_FAILED
&& mxman->mxman_state != MXMAN_STATE_FREEZED) {
WARN_ON(mxman->mxman_state != MXMAN_STATE_FAILED
&& mxman->mxman_state != MXMAN_STATE_FREEZED);
SCSC_TAG_ERR(MXMAN, "Bad state=%d\n", mxman->mxman_state);
wake_unlock(&mxman->recovery_wake_lock);
mutex_unlock(&mxman->mxman_mutex);
return;
}
/* Signal panic to r4 and m4 processors */
SCSC_TAG_INFO(MXMAN, "Setting MIFINTRBIT_RESERVED_PANIC_R4\n");
mif->irq_bit_set(mif, MIFINTRBIT_RESERVED_PANIC_R4, SCSC_MIFINTR_TARGET_R4);
SCSC_TAG_INFO(MXMAN, "Setting MIFINTRBIT_RESERVED_PANIC_M4\n");
mif->irq_bit_set(mif, MIFINTRBIT_RESERVED_PANIC_M4, SCSC_MIFINTR_TARGET_M4);
srvman_freeze_services(srvman);
if (mxman->mxman_state == MXMAN_STATE_FAILED) {
u32 *r4_panic_record = (u32 *)(mxman->fw + mxman->fwhdr.r4_panic_record_offset);
u32 *m4_panic_record;
bool r4_panic_record_ok = false;
bool m4_panic_record_ok = false;
/* some configurable delay before accessing the panic record */
msleep(panic_record_delay);
r4_panic_record_ok = fw_parse_r4_panic_record(r4_panic_record);
if (mxman->fwhdr.m4_panic_record_offset) {
m4_panic_record = (u32 *)(mxman->fw + mxman->fwhdr.m4_panic_record_offset);
m4_panic_record_ok = fw_parse_m4_panic_record(m4_panic_record);
} else {
SCSC_TAG_INFO(MXMAN, "M4 panic record doesn't exist in the firmware header\n");
}
/*
* Check if the panic was trigered by MX and
* set the subcode if so.
*/
if ((scsc_panic_code & 0x8000) == 0) {
if (r4_panic_record_ok)
scsc_panic_code |= 0xFFF & r4_panic_record[2];
else if (m4_panic_record_ok)
scsc_panic_code |= 0xFFF & m4_panic_record[2];
}
/* Set unspecified technilogy for now */
scsc_panic_code |= 0x03 << 13;
SCSC_TAG_INFO(MXMAN, "scsc_panic_code=0x%x\n", scsc_panic_code);
SCSC_TAG_INFO(MXMAN, "Trying to schedule coredump\n");
SCSC_TAG_INFO(MXMAN, "scsc_release %d.%d.%d\n",
SCSC_RELEASE_PRODUCT,
SCSC_RELEASE_ITERATION,
SCSC_RELEASE_CANDIDATE);
/* schedule coredump and wait for it to finish */
if (disable_auto_coredump)
SCSC_TAG_INFO(MXMAN, "Driver automatic coredump disabled, not launching coredump helper\n");
else {
SCSC_TAG_INFO(MXMAN, "Invoking coredump helper\n");
(void)coredump_helper();
}
/* Clean up the MIF following error handling */
if (mif->mif_cleanup && disable_recovery_handling)
mif->mif_cleanup(mif);
}
if (!disable_recovery_handling)
srvman_clear_error(srvman);
mutex_unlock(&mxman->mxman_mutex);
if (!disable_recovery_handling) {
SCSC_TAG_INFO(MXMAN, "Calling srvman_unfreeze_services with scsc_panic_code=0x%x\n", scsc_panic_code);
srvman_unfreeze_services(srvman, scsc_panic_code);
if (scsc_mx_module_reset() < 0)
SCSC_TAG_INFO(MXMAN, "failed to call scsc_mx_module_reset\n");
}
/**
* If recovery is disabled and an scsc_mx_service_open has been hold up,
* release it, rather than wait for the recovery_completion to timeout.
*/
if (disable_recovery_handling)
complete(&mxman->recovery_completion);
wake_unlock(&mxman->recovery_wake_lock);
}
static void failure_wq_init(struct mxman *mxman)
{
mxman->failure_wq = create_singlethread_workqueue("failure_wq");
INIT_WORK(&mxman->failure_work, mxman_failure_work);
}
static void failure_wq_stop(struct mxman *mxman)
{
cancel_work_sync(&mxman->failure_work);
flush_workqueue(mxman->failure_wq);
}
static void failure_wq_deinit(struct mxman *mxman)
{
failure_wq_stop(mxman);
destroy_workqueue(mxman->failure_wq);
}
static void failure_wq_start(struct mxman *mxman)
{
if (disable_error_handling)
SCSC_TAG_INFO(MXMAN, "error handling disabled\n");
else
queue_work(mxman->failure_wq, &mxman->failure_work);
}
static void print_mailboxes(struct mxman *mxman)
{
struct scsc_mif_abs *mif;
struct mifmboxman *mboxman;
int i;
mif = scsc_mx_get_mif_abs(mxman->mx);
mboxman = scsc_mx_get_mboxman(mxman->mx);
SCSC_TAG_INFO(MXMAN, "Printing mailbox values:\n");
for (i = 0; i < MIFMBOX_NUM; i++)
SCSC_TAG_INFO(MXMAN, "MBOX_%d: 0x%x\n", i, *mifmboxman_get_mbox_ptr(mboxman, mif, i));
}
/*
* Check for matching f/w and h/w
*
* Returns 0: f/w and h/w match
* 1: f/w and h/w mismatch, try the next config
* -ve fatal error
*/
static int mxman_hw_ver_check(struct mxman *mxman)
{
if (mx140_file_supported_hw(mxman->mx, mxman->rf_hw_ver))
return 0;
else
return 1;
}
/*
* Select the f/w version to load next
*/
static int mxman_select_next_fw(struct mxman *mxman)
{
return mx140_file_select_fw(mxman->mx, mxman->rf_hw_ver);
}
/* Boot MX140 with given f/w */
static int __mxman_open(struct mxman *mxman)
{
int r;
struct srvman *srvman;
mx140_basedir_file(mxman->mx);
mutex_lock(&mxman->mxman_mutex);
srvman = scsc_mx_get_srvman(mxman->mx);
if (srvman && srvman->error) {
mutex_unlock(&mxman->mxman_mutex);
SCSC_TAG_INFO(MXMAN, "Called during error - ignore\n");
return -EINVAL;
}
if (mxman->mxman_state == MXMAN_STATE_STARTED) {
/* if in the STARTED state there MUST already be some users */
if (WARN_ON(!mxman->users)) {
SCSC_TAG_ERR(MXMAN, "ERROR mxman->mxman_state=%d users=%d\n", mxman->mxman_state, mxman->users);
mutex_unlock(&mxman->mxman_mutex);
return -EINVAL;
}
mxman->users++;
SCSC_TAG_INFO(MXMAN, "Already opened: users=%d\n", mxman->users);
mutex_unlock(&mxman->mxman_mutex);
return 0;
} else if (mxman->mxman_state == MXMAN_STATE_STOPPED) {
r = mxman_start(mxman);
if (r) {
SCSC_TAG_ERR(MXMAN, "maxwell_manager_start() failed r=%d users=%d\n", r, mxman->users);
mutex_unlock(&mxman->mxman_mutex);
return r;
}
mxman->users++;
mxman->mxman_state = MXMAN_STATE_STARTED;
mutex_unlock(&mxman->mxman_mutex);
if (!disable_logger)
_mx_exec("/system/bin/mx_logger.sh", UMH_WAIT_EXEC);
return 0;
}
WARN_ON(mxman->mxman_state != MXMAN_STATE_STARTED && mxman->mxman_state != MXMAN_STATE_STOPPED);
SCSC_TAG_ERR(MXMAN, "Bad state: mxman->mxman_state=%d\n", mxman->mxman_state);
mutex_unlock(&mxman->mxman_mutex);
return -EPERM;
}
int mxman_open(struct mxman *mxman)
{
int r;
int try = 0;
struct scsc_mif_abs *mif = scsc_mx_get_mif_abs(mxman->mx);
for (try = 0; try < 2; try++) {
/* Boot WLBT. This will determine the h/w version */
r = __mxman_open(mxman);
if (r)
return r;
/* On retries, restore USBPLL owner as WLBT */
if (try > 0 && mif->mif_restart)
mif->mif_restart(mif);
/* Check the h/w and f/w versions are compatible */
r = mxman_hw_ver_check(mxman);
if (r > 0) {
/* Not compatible, so try next f/w */
SCSC_TAG_INFO(MXMAN, "Incompatible h/w 0x%04x vs f/w, close and try next\n", mxman->rf_hw_ver);
/* Temporarily return USBPLL owner to AP to keep USB alive */
if (mif->mif_cleanup)
mif->mif_cleanup(mif);
/* Stop WLBT */
mxman_close(mxman);
/* Select the new f/w for this hw ver */
mxman_select_next_fw(mxman);
} else
break; /* Running or given up */
}
return r;
}
static void mxman_stop(struct mxman *mxman)
{
struct scsc_mif_abs *mif;
SCSC_TAG_INFO(MXMAN, "\n");
(void)snprintf(mxman->fw_build_id, sizeof(mxman->fw_build_id), "unknown");
mxproc_remove_ctrl_proc_dir(&mxman->mxproc);
/* Shutdown the hardware */
mif = scsc_mx_get_mif_abs(mxman->mx);
mif->reset(mif, 1);
transports_release(mxman);
#ifndef MAXWELL_SKIP_MANAGER
mxlog_release(scsc_mx_get_mxlog(mxman->mx));
/* unregister channel handler */
mxmgmt_transport_register_channel_handler(scsc_mx_get_mxmgmt_transport(mxman->mx), MMTRANS_CHAN_ID_MAXWELL_MANAGEMENT,
NULL, NULL);
fw_crc_wq_stop(mxman);
#endif
/* Unitialise components (they may perform some checks - e.g. all memory freed) */
mifintrbit_deinit(scsc_mx_get_intrbit(mxman->mx));
miframman_deinit(scsc_mx_get_ramman(mxman->mx));
mifmboxman_deinit(scsc_mx_get_mboxman(mxman->mx));
/* Release the MIF memory resources */
mif->unmap(mif, mxman->start_dram);
}
void mxman_close(struct mxman *mxman)
{
int r;
struct srvman *srvman;
mutex_lock(&mxman->mxman_mutex);
srvman = scsc_mx_get_srvman(mxman->mx);
if (srvman && srvman->error) {
mutex_unlock(&mxman->mxman_mutex);
SCSC_TAG_INFO(MXMAN, "Called during error - ignore\n");
return;
}
SCSC_TAG_INFO(MXMAN, "\n");
if (mxman->mxman_state == MXMAN_STATE_STARTED) {
if (WARN_ON(!mxman->users)) {
SCSC_TAG_ERR(MXMAN, "ERROR users=%d\n", mxman->users);
mutex_unlock(&mxman->mxman_mutex);
return;
}
mxman->users--;
if (mxman->users) {
SCSC_TAG_INFO(MXMAN, "Current number of users=%d\n", mxman->users);
mutex_unlock(&mxman->mxman_mutex);
return;
}
#ifndef MAXWELL_SKIP_MANAGER
/*
* Ask the subsystem to stop (MM_STOP_REQ), and wait
* for response (MM_STOP_RSP).
*/
r = send_mm_msg_stop_blocking(mxman);
if (r)
SCSC_TAG_ERR(MXMAN, "send_mm_msg_stop_blocking failed: r=%d\n", r);
#endif
mxman_stop(mxman);
mxman->mxman_state = MXMAN_STATE_STOPPED;
mutex_unlock(&mxman->mxman_mutex);
} else if (mxman->mxman_state == MXMAN_STATE_FAILED) {
if (WARN_ON(!mxman->users))
SCSC_TAG_ERR(MXMAN, "ERROR users=%d\n", mxman->users);
mxman->users--;
if (mxman->users) {
SCSC_TAG_INFO(MXMAN, "Current number of users=%d\n", mxman->users);
mutex_unlock(&mxman->mxman_mutex);
return;
}
mxman_stop(mxman);
mxman->mxman_state = MXMAN_STATE_STOPPED;
mutex_unlock(&mxman->mxman_mutex);
complete(&mxman->recovery_completion);
} else {
WARN_ON(mxman->mxman_state != MXMAN_STATE_STARTED);
SCSC_TAG_ERR(MXMAN, "Bad state: mxman->mxman_state=%d\n", mxman->mxman_state);
mutex_unlock(&mxman->mxman_mutex);
return;
}
}
void mxman_fail(struct mxman *mxman, u16 scsc_panic_code)
{
if (mxman->mxman_state == MXMAN_STATE_STARTED) {
mxman->mxman_next_state = MXMAN_STATE_FAILED;
mxman->scsc_panic_code = scsc_panic_code;
SCSC_TAG_INFO(MXMAN, "scsc_panic_code=0x%x\n", scsc_panic_code);
failure_wq_start(mxman);
} else {
SCSC_TAG_WARNING(MXMAN, "Not in MXMAN_STATE_STARTED state, ignore\n");
}
}
void mxman_freeze(struct mxman *mxman)
{
if (mxman->mxman_state == MXMAN_STATE_STARTED) {
mxman->mxman_next_state = MXMAN_STATE_FREEZED;
failure_wq_start(mxman);
} else {
SCSC_TAG_WARNING(MXMAN, "Not in MXMAN_STATE_STARTED state, ignore\n");
}
}
void mxman_init(struct mxman *mxman, struct scsc_mx *mx)
{
mxman->mx = mx;
mxman->suspended = 0;
fw_crc_wq_init(mxman);
failure_wq_init(mxman);
mutex_init(&mxman->mxman_mutex);
init_completion(&mxman->recovery_completion);
wake_lock_init(&mxman->recovery_wake_lock, WAKE_LOCK_SUSPEND, "mxman_recovery");
/* set the initial state */
mxman->mxman_state = MXMAN_STATE_STOPPED;
(void)snprintf(mxman->fw_build_id, sizeof(mxman->fw_build_id), "unknown");
mxproc_create_info_proc_dir(&mxman->mxproc, mxman);
}
void mxman_deinit(struct mxman *mxman)
{
mxproc_remove_info_proc_dir(&mxman->mxproc);
fw_crc_wq_deinit(mxman);
failure_wq_deinit(mxman);
wake_lock_destroy(&mxman->recovery_wake_lock);
mutex_destroy(&mxman->mxman_mutex);
}
int mxman_force_panic(struct mxman *mxman)
{
struct srvman *srvman;
struct ma_msg_packet message = { .ma_msg = MM_FORCE_PANIC };
mutex_lock(&mxman->mxman_mutex);
srvman = scsc_mx_get_srvman(mxman->mx);
if (srvman && srvman->error) {
mutex_unlock(&mxman->mxman_mutex);
SCSC_TAG_INFO(MXMAN, "Called during error - ignore\n");
return -EINVAL;
}
if (mxman->mxman_state == MXMAN_STATE_STARTED) {
mxmgmt_transport_send(scsc_mx_get_mxmgmt_transport(mxman->mx), MMTRANS_CHAN_ID_MAXWELL_MANAGEMENT, &message, sizeof(message));
mutex_unlock(&mxman->mxman_mutex);
return 0;
}
mutex_unlock(&mxman->mxman_mutex);
return -EINVAL;
}
int mxman_suspend(struct mxman *mxman)
{
struct srvman *srvman;
struct ma_msg_packet message = { .ma_msg = MM_HOST_SUSPEND };
SCSC_TAG_INFO(MXMAN, "\n");
mutex_lock(&mxman->mxman_mutex);
srvman = scsc_mx_get_srvman(mxman->mx);
if (srvman && srvman->error) {
mutex_unlock(&mxman->mxman_mutex);
SCSC_TAG_INFO(MXMAN, "Called during error - ignore\n");
return -EINVAL;
}
if (mxman->mxman_state == MXMAN_STATE_STARTED) {
SCSC_TAG_INFO(MXMAN, "MM_HOST_SUSPEND\n");
mxmgmt_transport_send(scsc_mx_get_mxmgmt_transport(mxman->mx), MMTRANS_CHAN_ID_MAXWELL_MANAGEMENT, &message, sizeof(message));
mxman->suspended = 1;
atomic_inc(&mxman->suspend_count);
}
mutex_unlock(&mxman->mxman_mutex);
return 0;
}
void mxman_resume(struct mxman *mxman)
{
struct srvman *srvman;
struct ma_msg_packet message = { .ma_msg = MM_HOST_RESUME };
SCSC_TAG_INFO(MXMAN, "\n");
mutex_lock(&mxman->mxman_mutex);
srvman = scsc_mx_get_srvman(mxman->mx);
if (srvman && srvman->error) {
mutex_unlock(&mxman->mxman_mutex);
SCSC_TAG_INFO(MXMAN, "Called during error - ignore\n");
return;
}
if (mxman->mxman_state == MXMAN_STATE_STARTED) {
SCSC_TAG_INFO(MXMAN, "MM_HOST_RESUME\n");
mxmgmt_transport_send(scsc_mx_get_mxmgmt_transport(mxman->mx), MMTRANS_CHAN_ID_MAXWELL_MANAGEMENT, &message, sizeof(message));
mxman->suspended = 0;
}
mutex_unlock(&mxman->mxman_mutex);
}
static void _mx_exec_cleanup(struct subprocess_info *sp_info)
{
if (!sp_info) {
pr_err("%s: sp_info is null", __func__);
return;
}
if (!sp_info->argv) {
pr_err("%s: argv is null", __func__);
return;
}
pr_info("%s: 0x%p\n", __func__, sp_info->argv);
argv_free(sp_info->argv);
}
/* prog - full path to programme
* wait_exec - one of UMH_WAIT_EXEC, UMH_WAIT_PROC, UMH_KILLABLE, UMH_NO_WAIT
*/
static int _mx_exec(char *prog, int wait_exec)
{
static char const *envp[] = { "HOME=/", "PATH=/system/bin:/sbin:", NULL };
const int exec_string_buffer_len = STRING_BUFFER_MAX_LENGTH;
const int exec_string_args = NUMBER_OF_STRING_ARGS;
char **argv;
char argv_str[exec_string_buffer_len];
int argc, result, len;
struct subprocess_info *sp_info;
len = snprintf(argv_str, exec_string_buffer_len, "%s", prog);
if (len >= exec_string_buffer_len) {
/* snprintf() returns a value of buffer size of greater if it had to truncate the format string. */
pr_err("%s: exec string buffer insufficient (buffer size=%d, actual string=%d)\n", __func__, exec_string_buffer_len, len);
return -E2BIG;
}
/* Kernel library function argv_split() will allocate memory for argv. */
argc = 0;
argv = argv_split(GFP_ATOMIC, argv_str, &argc);
if (!argv) {
pr_err("%s: failed to allocate argv for userspace helper\n", __func__);
return -ENOMEM;
}
/* Check the argument count - should be exec_string_args. */
if (argc != exec_string_args) {
pr_err("%s: exec string has the wrong number of arguments (has %d, should be %d)\n", __func__, argc, exec_string_args);
argv_free(argv);
return -E2BIG;
}
/* Allocate sp_info and initialise pointers to argv and envp. */
sp_info = call_usermodehelper_setup(argv[0], argv, (char **)envp, GFP_KERNEL, NULL, _mx_exec_cleanup, NULL);
if (!sp_info) {
pr_err("%s: call_usermodehelper_setup() failed\n", __func__);
argv_free(argv);
return -EIO;
}
/*
* Put sp_info into work queue for processing by khelper.
* UMH_WAIT_EXEC: wait to see launch
*/
pr_info("%s: Launch %s\n", __func__, prog);
result = call_usermodehelper_exec(sp_info, wait_exec);
if (result != 0) {
/*
* call_usermodehelper_exec() will free sp_info and call any cleanup function
* whether it succeeds or fails, so do not free argv.
*/
if (result == -ENOENT)
pr_err("%s: call_usermodehelper() failed with %d, Executable not found %s'\n", __func__, result, prog);
else
pr_err("%s: call_usermodehelper_exec() failed with %d\n", __func__, result);
}
return result;
}
int mx140_log_dump(void)
{
return _mx_exec("/system/bin/mx_logger_dump.sh", UMH_WAIT_EXEC);
}
EXPORT_SYMBOL(mx140_log_dump);
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