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// SPDX-License-Identifier: ISC
/* Copyright (C) 2023 MediaTek Inc. */
#include <linux/devcoredump.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/utsname.h>
#include "coredump.h"
static bool coredump_memdump;
module_param(coredump_memdump, bool, 0644);
MODULE_PARM_DESC(coredump_memdump, "Optional ability to dump firmware memory");
static const struct mt7996_mem_region mt7996_mem_regions[] = {
{
.start = 0x00800000,
.len = 0x0004ffff,
.name = "ULM0",
},
{
.start = 0x00900000,
.len = 0x00037fff,
.name = "ULM1",
},
{
.start = 0x02200000,
.len = 0x0003ffff,
.name = "ULM2",
},
{
.start = 0x00400000,
.len = 0x00067fff,
.name = "SRAM",
},
{
.start = 0xe0000000,
.len = 0x0015ffff,
.name = "CRAM0",
},
{
.start = 0xe0160000,
.len = 0x0011bfff,
.name = "CRAM1",
},
};
const struct mt7996_mem_region*
mt7996_coredump_get_mem_layout(struct mt7996_dev *dev, u32 *num)
{
switch (mt76_chip(&dev->mt76)) {
case 0x7990:
case 0x7991:
*num = ARRAY_SIZE(mt7996_mem_regions);
return &mt7996_mem_regions[0];
default:
return NULL;
}
}
static int mt7996_coredump_get_mem_size(struct mt7996_dev *dev)
{
const struct mt7996_mem_region *mem_region;
size_t size = 0;
u32 num;
int i;
mem_region = mt7996_coredump_get_mem_layout(dev, &num);
if (!mem_region)
return 0;
for (i = 0; i < num; i++) {
size += mem_region->len;
mem_region++;
}
/* reserve space for the headers */
size += num * sizeof(struct mt7996_mem_hdr);
/* make sure it is aligned 4 bytes for debug message print out */
size = ALIGN(size, 4);
return size;
}
struct mt7996_crash_data *mt7996_coredump_new(struct mt7996_dev *dev)
{
struct mt7996_crash_data *crash_data = dev->coredump.crash_data;
lockdep_assert_held(&dev->dump_mutex);
if (coredump_memdump &&
!mt76_poll_msec(dev, MT_FW_DUMP_STATE, 0x3, 0x2, 500))
return NULL;
guid_gen(&crash_data->guid);
ktime_get_real_ts64(&crash_data->timestamp);
return crash_data;
}
static void
mt7996_coredump_fw_state(struct mt7996_dev *dev, struct mt7996_coredump *dump,
bool *exception)
{
u32 count;
count = mt76_rr(dev, MT_FW_ASSERT_CNT);
/* normal mode: driver can manually trigger assert for detail info */
if (!count)
strscpy(dump->fw_state, "normal", sizeof(dump->fw_state));
else
strscpy(dump->fw_state, "exception", sizeof(dump->fw_state));
*exception = !!count;
}
static void
mt7996_coredump_fw_stack(struct mt7996_dev *dev, struct mt7996_coredump *dump,
bool exception)
{
u32 oldest, i, idx;
strscpy(dump->pc_current, "program counter", sizeof(dump->pc_current));
/* 0: WM PC log output */
mt76_wr(dev, MT_CONN_DBG_CTL_OUT_SEL, 0);
/* choose 33th PC log buffer to read current PC index */
mt76_wr(dev, MT_CONN_DBG_CTL_PC_LOG_SEL, 0x3f);
/* read current PC */
dump->pc_stack[0] = mt76_rr(dev, MT_CONN_DBG_CTL_PC_LOG);
/* stop call stack record */
if (!exception) {
mt76_clear(dev, MT_MCU_WM_EXCP_PC_CTRL, BIT(0));
mt76_clear(dev, MT_MCU_WM_EXCP_LR_CTRL, BIT(0));
}
oldest = (u32)mt76_get_field(dev, MT_MCU_WM_EXCP_PC_CTRL,
GENMASK(20, 16)) + 2;
for (i = 0; i < 16; i++) {
idx = ((oldest + 2 * i + 1) % 32);
dump->pc_stack[i + 1] =
mt76_rr(dev, MT_MCU_WM_EXCP_PC_LOG + idx * 4);
}
oldest = (u32)mt76_get_field(dev, MT_MCU_WM_EXCP_LR_CTRL,
GENMASK(20, 16)) + 2;
for (i = 0; i < 16; i++) {
idx = ((oldest + 2 * i + 1) % 32);
dump->lr_stack[i] =
mt76_rr(dev, MT_MCU_WM_EXCP_LR_LOG + idx * 4);
}
/* start call stack record */
if (!exception) {
mt76_set(dev, MT_MCU_WM_EXCP_PC_CTRL, BIT(0));
mt76_set(dev, MT_MCU_WM_EXCP_LR_CTRL, BIT(0));
}
}
static struct mt7996_coredump *mt7996_coredump_build(struct mt7996_dev *dev)
{
struct mt7996_crash_data *crash_data = dev->coredump.crash_data;
struct mt7996_coredump *dump;
struct mt7996_coredump_mem *dump_mem;
size_t len, sofar = 0, hdr_len = sizeof(*dump);
unsigned char *buf;
bool exception;
len = hdr_len;
if (coredump_memdump && crash_data->memdump_buf_len)
len += sizeof(*dump_mem) + crash_data->memdump_buf_len;
sofar += hdr_len;
/* this is going to get big when we start dumping memory and such,
* so go ahead and use vmalloc.
*/
buf = vzalloc(len);
if (!buf)
return NULL;
mutex_lock(&dev->dump_mutex);
dump = (struct mt7996_coredump *)(buf);
dump->len = len;
/* plain text */
strscpy(dump->magic, "mt76-crash-dump", sizeof(dump->magic));
strscpy(dump->kernel, init_utsname()->release, sizeof(dump->kernel));
strscpy(dump->fw_ver, dev->mt76.hw->wiphy->fw_version,
sizeof(dump->fw_ver));
guid_copy(&dump->guid, &crash_data->guid);
dump->tv_sec = crash_data->timestamp.tv_sec;
dump->tv_nsec = crash_data->timestamp.tv_nsec;
dump->device_id = mt76_chip(&dev->mt76);
mt7996_coredump_fw_state(dev, dump, &exception);
mt7996_coredump_fw_stack(dev, dump, exception);
/* gather memory content */
dump_mem = (struct mt7996_coredump_mem *)(buf + sofar);
dump_mem->len = crash_data->memdump_buf_len;
if (coredump_memdump && crash_data->memdump_buf_len)
memcpy(dump_mem->data, crash_data->memdump_buf,
crash_data->memdump_buf_len);
mutex_unlock(&dev->dump_mutex);
return dump;
}
int mt7996_coredump_submit(struct mt7996_dev *dev)
{
struct mt7996_coredump *dump;
dump = mt7996_coredump_build(dev);
if (!dump) {
dev_warn(dev->mt76.dev, "no crash dump data found\n");
return -ENODATA;
}
dev_coredumpv(dev->mt76.dev, dump, dump->len, GFP_KERNEL);
return 0;
}
int mt7996_coredump_register(struct mt7996_dev *dev)
{
struct mt7996_crash_data *crash_data;
crash_data = vzalloc(sizeof(*dev->coredump.crash_data));
if (!crash_data)
return -ENOMEM;
dev->coredump.crash_data = crash_data;
if (coredump_memdump) {
crash_data->memdump_buf_len = mt7996_coredump_get_mem_size(dev);
if (!crash_data->memdump_buf_len)
/* no memory content */
return 0;
crash_data->memdump_buf = vzalloc(crash_data->memdump_buf_len);
if (!crash_data->memdump_buf) {
vfree(crash_data);
return -ENOMEM;
}
}
return 0;
}
void mt7996_coredump_unregister(struct mt7996_dev *dev)
{
if (dev->coredump.crash_data->memdump_buf) {
vfree(dev->coredump.crash_data->memdump_buf);
dev->coredump.crash_data->memdump_buf = NULL;
dev->coredump.crash_data->memdump_buf_len = 0;
}
vfree(dev->coredump.crash_data);
dev->coredump.crash_data = NULL;
}
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