Pstore dmesg 注册篇

1. 注册pstore_info，提供pstore存储区域和操作函数；

static int ramoops_probe(struct platform_device *pdev){struct ramoops_context * cxt = &oops_cxt;/* * Only a single ramoops area allowed at a time */if (cxt->max_dump_cnt)goto fail_out;cxt->pstore.data = cxt;err = pstore_register(&cxt-pstore);}static struct ramoops_context oops_cxt = {.pstore = {.owner  = THIS_MODULE,.name   = "ramoops",.open   = ramoops_pstore_open,.read   = ramoops_pstore_read,.write_buf = ramoops_pstore_write_buf,.erase  = ramoops_pstore_erase,};};

2. 注册kmsg dumper；

int pstore_register(struct pstore_info * psi){/* 用 write_buf 实现 write */if (!psi->write)psi->write = pstore_write_compat;/* only one psinfo */psinfo = psi;allocate_buf_for_compression();/* 注册kernel dump */pstore_register_kmsg();}static void allocate_buf_for_compression(void){/* 用于压缩的log */big_oops_buf_sz = (psinfo->bufsize * 100) / cmpr;big_oops_buf = kmalloc(big_oops_buf_sz, GFP_KERNEL);}static void pstore_register_kmsg(void ){kmsg_dump_register(&pstore_dumper);}static struct kmsg_dumper pstore_dumper = {.dump = pstore_dump,}；