/* * Sclp "store data in absolut storage" * * Copyright IBM Corp. 2003,2007 * Author(s): Michael Holzheu */ #define KMSG_COMPONENT "sclp_sdias" #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt #include <linux/sched.h> #include <asm/sclp.h> #include <asm/debug.h> #include <asm/ipl.h> #include "sclp.h" #include "sclp_rw.h" #define TRACE(x...) debug_sprintf_event(sdias_dbf, 1, x) #define SDIAS_RETRIES 300 #define SDIAS_SLEEP_TICKS 50 #define EQ_STORE_DATA 0x0 #define EQ_SIZE 0x1 #define DI_FCP_DUMP 0x0 #define ASA_SIZE_32 0x0 #define ASA_SIZE_64 0x1 #define EVSTATE_ALL_STORED 0x0 #define EVSTATE_NO_DATA 0x3 #define EVSTATE_PART_STORED 0x10 static struct debug_info *sdias_dbf; static struct sclp_register sclp_sdias_register = { .send_mask = EVTYP_SDIAS_MASK, }; struct sdias_evbuf { struct evbuf_header hdr; u8 event_qual; u8 data_id; u64 reserved2; u32 event_id; u16 reserved3; u8 asa_size; u8 event_status; u32 reserved4; u32 blk_cnt; u64 asa; u32 reserved5; u32 fbn; u32 reserved6; u32 lbn; u16 reserved7; u16 dbs; } __attribute__((packed)); struct sdias_sccb { struct sccb_header hdr; struct sdias_evbuf evbuf; } __attribute__((packed)); static struct sdias_sccb sccb __attribute__((aligned(4096))); static int sclp_req_done; static wait_queue_head_t sdias_wq; static DEFINE_MUTEX(sdias_mutex); static void sdias_callback(struct sclp_req *request, void *data) { struct sdias_sccb *cbsccb; cbsccb = (struct sdias_sccb *) request->sccb; sclp_req_done = 1; wake_up(&sdias_wq); /* Inform caller, that request is complete */ TRACE("callback done\n"); } static int sdias_sclp_send(struct sclp_req *req) { int retries; int rc; for (retries = SDIAS_RETRIES; retries; retries--) { sclp_req_done = 0; TRACE("add request\n"); rc = sclp_add_request(req); if (rc) { /* not initiated, wait some time and retry */ set_current_state(TASK_INTERRUPTIBLE); TRACE("add request failed: rc = %i\n",rc); schedule_timeout(SDIAS_SLEEP_TICKS); continue; } /* initiated, wait for completion of service call */ wait_event(sdias_wq, (sclp_req_done == 1)); if (req->status == SCLP_REQ_FAILED) { TRACE("sclp request failed\n"); rc = -EIO; continue; } TRACE("request done\n"); break; } return rc; } /* * Get number of blocks (4K) available in the HSA */ int sclp_sdias_blk_count(void) { struct sclp_req request; int rc; mutex_lock(&sdias_mutex); memset(&sccb, 0, sizeof(sccb)); memset(&request, 0, sizeof(request)); sccb.hdr.length = sizeof(sccb); sccb.evbuf.hdr.length = sizeof(struct sdias_evbuf); sccb.evbuf.hdr.type = EVTYP_SDIAS; sccb.evbuf.event_qual = EQ_SIZE; sccb.evbuf.data_id = DI_FCP_DUMP; sccb.evbuf.event_id = 4712; sccb.evbuf.dbs = 1; request.sccb = &sccb; request.command = SCLP_CMDW_WRITE_EVENT_DATA; request.status = SCLP_REQ_FILLED; request.callback = sdias_callback; rc = sdias_sclp_send(&request); if (rc) { pr_err("sclp_send failed for get_nr_blocks\n"); goto out; } if (sccb.hdr.response_code != 0x0020) { TRACE("send failed: %x\n", sccb.hdr.response_code); rc = -EIO; goto out; } switch (sccb.evbuf.event_status) { case 0: rc = sccb.evbuf.blk_cnt; break; default: pr_err("SCLP error: %x\n", sccb.evbuf.event_status); rc = -EIO; goto out; } TRACE("%i blocks\n", rc); out: mutex_unlock(&sdias_mutex); return rc; } /* * Copy from HSA to absolute storage (not reentrant): * * @dest : Address of buffer where data should be copied * @start_blk: Start Block (beginning with 1) * @nr_blks : Number of 4K blocks to copy * * Return Value: 0 : Requested 'number' of blocks of data copied * <0: ERROR - negative event status */ int sclp_sdias_copy(void *dest, int start_blk, int nr_blks) { struct sclp_req request; int rc; mutex_lock(&sdias_mutex); memset(&sccb, 0, sizeof(sccb)); memset(&request, 0, sizeof(request)); sccb.hdr.length = sizeof(sccb); sccb.evbuf.hdr.length = sizeof(struct sdias_evbuf); sccb.evbuf.hdr.type = EVTYP_SDIAS; sccb.evbuf.hdr.flags = 0; sccb.evbuf.event_qual = EQ_STORE_DATA; sccb.evbuf.data_id = DI_FCP_DUMP; sccb.evbuf.event_id = 4712; #ifdef __s390x__ sccb.evbuf.asa_size = ASA_SIZE_64; #else sccb.evbuf.asa_size = ASA_SIZE_32; #endif sccb.evbuf.event_status = 0; sccb.evbuf.blk_cnt = nr_blks; sccb.evbuf.asa = (unsigned long)dest; sccb.evbuf.fbn = start_blk; sccb.evbuf.lbn = 0; sccb.evbuf.dbs = 1; request.sccb = &sccb; request.command = SCLP_CMDW_WRITE_EVENT_DATA; request.status = SCLP_REQ_FILLED; request.callback = sdias_callback; rc = sdias_sclp_send(&request); if (rc) { pr_err("sclp_send failed: %x\n", rc); goto out; } if (sccb.hdr.response_code != 0x0020) { TRACE("copy failed: %x\n", sccb.hdr.response_code); rc = -EIO; goto out; } switch (sccb.evbuf.event_status) { case EVSTATE_ALL_STORED: TRACE("all stored\n"); case EVSTATE_PART_STORED: TRACE("part stored: %i\n", sccb.evbuf.blk_cnt); break; case EVSTATE_NO_DATA: TRACE("no data\n"); default: pr_err("Error from SCLP while copying hsa. " "Event status = %x\n", sccb.evbuf.event_status); rc = -EIO; } out: mutex_unlock(&sdias_mutex); return rc; } int __init sclp_sdias_init(void) { int rc; if (ipl_info.type != IPL_TYPE_FCP_DUMP) return 0; sdias_dbf = debug_register("dump_sdias", 4, 1, 4 * sizeof(long)); debug_register_view(sdias_dbf, &debug_sprintf_view); debug_set_level(sdias_dbf, 6); rc = sclp_register(&sclp_sdias_register); if (rc) return rc; init_waitqueue_head(&sdias_wq); TRACE("init done\n"); return 0; } void __exit sclp_sdias_exit(void) { debug_unregister(sdias_dbf); sclp_unregister(&sclp_sdias_register); }