diff options
Diffstat (limited to 'drivers/net/wireless/mediatek/mt76/mt7915/coredump.c')
| -rw-r--r-- | drivers/net/wireless/mediatek/mt76/mt7915/coredump.c | 410 |
1 files changed, 410 insertions, 0 deletions
diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/coredump.c b/drivers/net/wireless/mediatek/mt76/mt7915/coredump.c new file mode 100644 index 000000000000..d097a56dd33d --- /dev/null +++ b/drivers/net/wireless/mediatek/mt76/mt7915/coredump.c @@ -0,0 +1,410 @@ +// SPDX-License-Identifier: ISC +/* Copyright (C) 2022 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 mt7915_mem_region mt7915_mem_regions[] = { + { + .start = 0xe003b400, + .len = 0x00003bff, + .name = "CRAM", + }, +}; + +static const struct mt7915_mem_region mt7916_mem_regions[] = { + { + .start = 0x00800000, + .len = 0x0005ffff, + .name = "ROM", + }, + { + .start = 0x00900000, + .len = 0x00013fff, + .name = "ULM1", + }, + { + .start = 0x02200000, + .len = 0x0004ffff, + .name = "ULM2", + }, + { + .start = 0x02300000, + .len = 0x0004ffff, + .name = "ULM3", + }, + { + .start = 0x00400000, + .len = 0x00027fff, + .name = "SRAM", + }, + { + .start = 0xe0000000, + .len = 0x00157fff, + .name = "CRAM", + }, +}; + +static const struct mt7915_mem_region mt7986_mem_regions[] = { + { + .start = 0x00800000, + .len = 0x0005ffff, + .name = "ROM", + }, + { + .start = 0x00900000, + .len = 0x0000ffff, + .name = "ULM1", + }, + { + .start = 0x02200000, + .len = 0x0004ffff, + .name = "ULM2", + }, + { + .start = 0x02300000, + .len = 0x0004ffff, + .name = "ULM3", + }, + { + .start = 0x00400000, + .len = 0x00017fff, + .name = "SRAM", + }, + { + .start = 0xe0000000, + .len = 0x00113fff, + .name = "CRAM", + }, +}; + +const struct mt7915_mem_region* +mt7915_coredump_get_mem_layout(struct mt7915_dev *dev, u32 *num) +{ + switch (mt76_chip(&dev->mt76)) { + case 0x7915: + *num = ARRAY_SIZE(mt7915_mem_regions); + return &mt7915_mem_regions[0]; + case 0x7986: + *num = ARRAY_SIZE(mt7986_mem_regions); + return &mt7986_mem_regions[0]; + case 0x7916: + *num = ARRAY_SIZE(mt7916_mem_regions); + return &mt7916_mem_regions[0]; + default: + return NULL; + } +} + +static int mt7915_coredump_get_mem_size(struct mt7915_dev *dev) +{ + const struct mt7915_mem_region *mem_region; + size_t size = 0; + u32 num; + int i; + + mem_region = mt7915_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 mt7915_mem_hdr); + /* make sure it is aligned 4 bytes for debug message print out */ + size = ALIGN(size, 4); + + return size; +} + +struct mt7915_crash_data *mt7915_coredump_new(struct mt7915_dev *dev) +{ + struct mt7915_crash_data *crash_data = dev->coredump.crash_data; + + lockdep_assert_held(&dev->dump_mutex); + + guid_gen(&crash_data->guid); + ktime_get_real_ts64(&crash_data->timestamp); + + return crash_data; +} + +static void +mt7915_coredump_fw_state(struct mt7915_dev *dev, struct mt7915_coredump *dump, + bool *exception) +{ + u32 state, count, type; + + type = (u32)mt76_get_field(dev, MT_FW_EXCEPT_TYPE, GENMASK(7, 0)); + state = (u32)mt76_get_field(dev, MT_FW_ASSERT_STAT, GENMASK(7, 0)); + count = is_mt7915(&dev->mt76) ? + (u32)mt76_get_field(dev, MT_FW_EXCEPT_COUNT, GENMASK(15, 8)) : + (u32)mt76_get_field(dev, MT_FW_EXCEPT_COUNT, GENMASK(7, 0)); + + /* normal mode: driver can manually trigger assert for detail info */ + if (!count) + strscpy(dump->fw_state, "normal", sizeof(dump->fw_state)); + else if (state > 1 && (count == 1) && type == 5) + strscpy(dump->fw_state, "assert", sizeof(dump->fw_state)); + else if ((state > 1 && count == 1) || count > 1) + strscpy(dump->fw_state, "exception", sizeof(dump->fw_state)); + + *exception = !!count; +} + +static void +mt7915_coredump_fw_trace(struct mt7915_dev *dev, struct mt7915_coredump *dump, + bool exception) +{ + u32 n, irq, sch, base = MT_FW_EINT_INFO; + + /* trap or run? */ + dump->last_msg_id = mt76_rr(dev, MT_FW_LAST_MSG_ID); + + n = is_mt7915(&dev->mt76) ? + (u32)mt76_get_field(dev, base, GENMASK(7, 0)) : + (u32)mt76_get_field(dev, base, GENMASK(15, 8)); + dump->eint_info_idx = n; + + irq = mt76_rr(dev, base + 0x8); + n = is_mt7915(&dev->mt76) ? + FIELD_GET(GENMASK(7, 0), irq) : FIELD_GET(GENMASK(23, 16), irq); + dump->irq_info_idx = n; + + sch = mt76_rr(dev, MT_FW_SCHED_INFO); + n = is_mt7915(&dev->mt76) ? + FIELD_GET(GENMASK(7, 0), sch) : FIELD_GET(GENMASK(15, 8), sch); + dump->sched_info_idx = n; + + if (exception) { + u32 i, y; + + /* sched trace */ + n = is_mt7915(&dev->mt76) ? + FIELD_GET(GENMASK(15, 8), sch) : FIELD_GET(GENMASK(7, 0), sch); + n = n > 60 ? 60 : n; + + strscpy(dump->trace_sched, "(sched_info) id, time", + sizeof(dump->trace_sched)); + + for (y = dump->sched_info_idx, i = 0; i < n; i++, y++) { + mt7915_memcpy_fromio(dev, dump->sched, base + 0xc + y * 12, + sizeof(dump->sched)); + y = y >= n ? 0 : y; + } + + /* irq trace */ + n = is_mt7915(&dev->mt76) ? + FIELD_GET(GENMASK(15, 8), irq) : FIELD_GET(GENMASK(7, 0), irq); + n = n > 60 ? 60 : n; + + strscpy(dump->trace_irq, "(irq_info) id, time", + sizeof(dump->trace_irq)); + + for (y = dump->irq_info_idx, i = 0; i < n; i++, y++) { + mt7915_memcpy_fromio(dev, dump->irq, base + 0x4 + y * 16, + sizeof(dump->irq)); + y = y >= n ? 0 : y; + } + } +} + +static void +mt7915_coredump_fw_stack(struct mt7915_dev *dev, struct mt7915_coredump *dump, + bool exception) +{ + u32 oldest, i, idx; + + /* stop call stack record */ + if (!exception) + mt76_clear(dev, 0x89050200, BIT(0)); + + oldest = (u32)mt76_get_field(dev, 0x89050200, GENMASK(20, 16)) + 2; + for (i = 0; i < 16; i++) { + idx = ((oldest + 2 * i + 1) % 32); + dump->call_stack[i] = mt76_rr(dev, 0x89050204 + idx * 4); + } + + /* start call stack record */ + if (!exception) + mt76_set(dev, 0x89050200, BIT(0)); +} + +static void +mt7915_coredump_fw_task(struct mt7915_dev *dev, struct mt7915_coredump *dump) +{ + u32 offs = is_mt7915(&dev->mt76) ? 0xe0 : 0x170; + + strscpy(dump->task_qid, "(task queue id) read, write", + sizeof(dump->task_qid)); + + dump->taskq[0].read = mt76_rr(dev, MT_FW_TASK_QID1); + dump->taskq[0].write = mt76_rr(dev, MT_FW_TASK_QID1 - 4); + dump->taskq[1].read = mt76_rr(dev, MT_FW_TASK_QID2); + dump->taskq[1].write = mt76_rr(dev, MT_FW_TASK_QID2 - 4); + + strscpy(dump->task_info, "(task stack) start, end, size", + sizeof(dump->task_info)); + + dump->taski[0].start = mt76_rr(dev, MT_FW_TASK_START); + dump->taski[0].end = mt76_rr(dev, MT_FW_TASK_END); + dump->taski[0].size = mt76_rr(dev, MT_FW_TASK_SIZE); + dump->taski[1].start = mt76_rr(dev, MT_FW_TASK_START + offs); + dump->taski[1].end = mt76_rr(dev, MT_FW_TASK_END + offs); + dump->taski[1].size = mt76_rr(dev, MT_FW_TASK_SIZE + offs); +} + +static void +mt7915_coredump_fw_context(struct mt7915_dev *dev, struct mt7915_coredump *dump) +{ + u32 count, idx, id; + + count = mt76_rr(dev, MT_FW_CIRQ_COUNT); + + /* current context */ + if (!count) { + strscpy(dump->fw_context, "(context) interrupt", + sizeof(dump->fw_context)); + + idx = is_mt7915(&dev->mt76) ? + (u32)mt76_get_field(dev, MT_FW_CIRQ_IDX, GENMASK(31, 16)) : + (u32)mt76_get_field(dev, MT_FW_CIRQ_IDX, GENMASK(15, 0)); + dump->context.idx = idx; + dump->context.handler = mt76_rr(dev, MT_FW_CIRQ_LISR); + } else { + idx = mt76_rr(dev, MT_FW_TASK_IDX); + id = mt76_rr(dev, MT_FW_TASK_ID); + + if (!id && idx == 3) { + strscpy(dump->fw_context, "(context) idle", + sizeof(dump->fw_context)); + } else if (id && idx != 3) { + strscpy(dump->fw_context, "(context) task", + sizeof(dump->fw_context)); + + dump->context.idx = idx; + dump->context.handler = id; + } + } +} + +static struct mt7915_coredump *mt7915_coredump_build(struct mt7915_dev *dev) +{ + struct mt7915_crash_data *crash_data = dev->coredump.crash_data; + struct mt7915_coredump *dump; + struct mt7915_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 mt7915_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); + + mt7915_coredump_fw_state(dev, dump, &exception); + mt7915_coredump_fw_trace(dev, dump, exception); + mt7915_coredump_fw_task(dev, dump); + mt7915_coredump_fw_context(dev, dump); + mt7915_coredump_fw_stack(dev, dump, exception); + + /* gather memory content */ + dump_mem = (struct mt7915_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 mt7915_coredump_submit(struct mt7915_dev *dev) +{ + struct mt7915_coredump *dump; + + dump = mt7915_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 mt7915_coredump_register(struct mt7915_dev *dev) +{ + struct mt7915_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 = mt7915_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 mt7915_coredump_unregister(struct mt7915_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; +} + |