diff options
Diffstat (limited to 'drivers/net/wireless/mediatek/mt76/mt7996/coredump.c')
| -rw-r--r-- | drivers/net/wireless/mediatek/mt76/mt7996/coredump.c | 268 |
1 files changed, 268 insertions, 0 deletions
diff --git a/drivers/net/wireless/mediatek/mt76/mt7996/coredump.c b/drivers/net/wireless/mediatek/mt76/mt7996/coredump.c new file mode 100644 index 0000000000..ccab0d7b9b --- /dev/null +++ b/drivers/net/wireless/mediatek/mt76/mt7996/coredump.c @@ -0,0 +1,268 @@ +// 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; +} + |