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drivers/s390/char/sclp_sdias.c
6.5 KB
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/* |
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* SCLP "store data in absolute storage" |
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* |
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* Copyright IBM Corp. 2003, 2013 |
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* Author(s): Michael Holzheu */ |
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#define KMSG_COMPONENT "sclp_sdias" #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
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#include <linux/completion.h> |
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#include <linux/sched.h> #include <asm/sclp.h> #include <asm/debug.h> #include <asm/ipl.h> |
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#include "sclp_sdias.h" |
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#include "sclp.h" #include "sclp_rw.h" #define TRACE(x...) debug_sprintf_event(sdias_dbf, 1, x) |
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#define SDIAS_RETRIES 300 #define SDIAS_SLEEP_TICKS 50 |
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static struct debug_info *sdias_dbf; static struct sclp_register sclp_sdias_register = { |
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.send_mask = EVTYP_SDIAS_MASK, |
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}; |
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static struct sdias_sccb sccb __attribute__((aligned(4096))); |
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static struct sdias_evbuf sdias_evbuf; |
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static DECLARE_COMPLETION(evbuf_accepted); static DECLARE_COMPLETION(evbuf_done); |
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static DEFINE_MUTEX(sdias_mutex); |
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/* * Called by SCLP base when read event data has been completed (async mode only) */ static void sclp_sdias_receiver_fn(struct evbuf_header *evbuf) { memcpy(&sdias_evbuf, evbuf, min_t(unsigned long, sizeof(sdias_evbuf), evbuf->length)); complete(&evbuf_done); TRACE("sclp_sdias_receiver_fn done "); } /* * Called by SCLP base when sdias event has been accepted */ |
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static void sdias_callback(struct sclp_req *request, void *data) { |
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complete(&evbuf_accepted); |
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TRACE("callback done "); } static int sdias_sclp_send(struct sclp_req *req) { int retries; int rc; for (retries = SDIAS_RETRIES; retries; retries--) { |
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TRACE("add request "); 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 ",rc); schedule_timeout(SDIAS_SLEEP_TICKS); continue; } /* initiated, wait for completion of service call */ |
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wait_for_completion(&evbuf_accepted); |
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if (req->status == SCLP_REQ_FAILED) { TRACE("sclp request failed "); |
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continue; } |
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/* if not accepted, retry */ if (!(sccb.evbuf.hdr.flags & 0x80)) { TRACE("sclp request failed: flags=%x ", sccb.evbuf.hdr.flags); continue; } /* * for the sync interface the response is in the initial sccb */ if (!sclp_sdias_register.receiver_fn) { memcpy(&sdias_evbuf, &sccb.evbuf, sizeof(sdias_evbuf)); TRACE("sync request done "); return 0; } /* otherwise we wait for completion */ wait_for_completion(&evbuf_done); |
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TRACE("request done "); |
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return 0; |
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} |
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return -EIO; |
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} /* * 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); |
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sccb.evbuf.hdr.type = EVTYP_SDIAS; |
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sccb.evbuf.event_qual = SDIAS_EQ_SIZE; sccb.evbuf.data_id = SDIAS_DI_FCP_DUMP; |
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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) { |
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pr_err("sclp_send failed for get_nr_blocks "); |
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goto out; } if (sccb.hdr.response_code != 0x0020) { TRACE("send failed: %x ", sccb.hdr.response_code); rc = -EIO; goto out; } |
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switch (sdias_evbuf.event_status) { |
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case 0: |
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rc = sdias_evbuf.blk_cnt; |
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break; default: |
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pr_err("SCLP error: %x ", sdias_evbuf.event_status); |
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rc = -EIO; goto out; } TRACE("%i blocks ", 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); |
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sccb.evbuf.hdr.type = EVTYP_SDIAS; |
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sccb.evbuf.hdr.flags = 0; |
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sccb.evbuf.event_qual = SDIAS_EQ_STORE_DATA; sccb.evbuf.data_id = SDIAS_DI_FCP_DUMP; |
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sccb.evbuf.event_id = 4712; |
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#ifdef CONFIG_64BIT |
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sccb.evbuf.asa_size = SDIAS_ASA_SIZE_64; |
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#else |
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sccb.evbuf.asa_size = SDIAS_ASA_SIZE_32; |
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#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) { |
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pr_err("sclp_send failed: %x ", rc); |
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goto out; } if (sccb.hdr.response_code != 0x0020) { TRACE("copy failed: %x ", sccb.hdr.response_code); rc = -EIO; goto out; } |
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switch (sdias_evbuf.event_status) { |
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case SDIAS_EVSTATE_ALL_STORED: TRACE("all stored "); break; case SDIAS_EVSTATE_PART_STORED: TRACE("part stored: %i ", sdias_evbuf.blk_cnt); break; case SDIAS_EVSTATE_NO_DATA: TRACE("no data "); /* fall through */ default: pr_err("Error from SCLP while copying hsa. Event status = %x ", sdias_evbuf.event_status); rc = -EIO; |
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} out: mutex_unlock(&sdias_mutex); return rc; } |
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static int __init sclp_sdias_register_check(void) |
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{ int rc; |
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rc = sclp_register(&sclp_sdias_register); if (rc) return rc; if (sclp_sdias_blk_count() == 0) { sclp_unregister(&sclp_sdias_register); return -ENODEV; } return 0; } static int __init sclp_sdias_init_sync(void) { TRACE("Try synchronous mode "); sclp_sdias_register.receive_mask = 0; sclp_sdias_register.receiver_fn = NULL; return sclp_sdias_register_check(); } static int __init sclp_sdias_init_async(void) { TRACE("Try asynchronous mode "); sclp_sdias_register.receive_mask = EVTYP_SDIAS_MASK; sclp_sdias_register.receiver_fn = sclp_sdias_receiver_fn; return sclp_sdias_register_check(); } int __init sclp_sdias_init(void) { |
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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); |
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if (sclp_sdias_init_sync() == 0) goto out; if (sclp_sdias_init_async() == 0) goto out; TRACE("init failed "); return -ENODEV; out: |
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TRACE("init done "); return 0; } |
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void __exit sclp_sdias_exit(void) |
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{ debug_unregister(sdias_dbf); sclp_unregister(&sclp_sdias_register); } |