From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/drivers/s390/char/sclp_sdias.c | 277 ++++++++++++++++++++++++++++++++++ 1 file changed, 277 insertions(+) create mode 100644 kernel/drivers/s390/char/sclp_sdias.c (limited to 'kernel/drivers/s390/char/sclp_sdias.c') diff --git a/kernel/drivers/s390/char/sclp_sdias.c b/kernel/drivers/s390/char/sclp_sdias.c new file mode 100644 index 000000000..eb7cb076c --- /dev/null +++ b/kernel/drivers/s390/char/sclp_sdias.c @@ -0,0 +1,277 @@ +/* + * SCLP "store data in absolute storage" + * + * Copyright IBM Corp. 2003, 2013 + * Author(s): Michael Holzheu + */ + +#define KMSG_COMPONENT "sclp_sdias" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include + +#include "sclp_sdias.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 + +static struct debug_info *sdias_dbf; + +static struct sclp_register sclp_sdias_register = { + .send_mask = EVTYP_SDIAS_MASK, +}; + +static struct sdias_sccb sccb __attribute__((aligned(4096))); +static struct sdias_evbuf sdias_evbuf; + +static DECLARE_COMPLETION(evbuf_accepted); +static DECLARE_COMPLETION(evbuf_done); +static DEFINE_MUTEX(sdias_mutex); + +/* + * 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\n"); +} + +/* + * Called by SCLP base when sdias event has been accepted + */ +static void sdias_callback(struct sclp_req *request, void *data) +{ + complete(&evbuf_accepted); + TRACE("callback done\n"); +} + +static int sdias_sclp_send(struct sclp_req *req) +{ + int retries; + int rc; + + for (retries = SDIAS_RETRIES; retries; retries--) { + 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_for_completion(&evbuf_accepted); + if (req->status == SCLP_REQ_FAILED) { + TRACE("sclp request failed\n"); + continue; + } + /* if not accepted, retry */ + if (!(sccb.evbuf.hdr.flags & 0x80)) { + TRACE("sclp request failed: flags=%x\n", + 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\n"); + return 0; + } + /* otherwise we wait for completion */ + wait_for_completion(&evbuf_done); + TRACE("request done\n"); + return 0; + } + return -EIO; +} + +/* + * 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 = SDIAS_EQ_SIZE; + sccb.evbuf.data_id = SDIAS_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 (sdias_evbuf.event_status) { + case 0: + rc = sdias_evbuf.blk_cnt; + break; + default: + pr_err("SCLP error: %x\n", sdias_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 = SDIAS_EQ_STORE_DATA; + sccb.evbuf.data_id = SDIAS_DI_FCP_DUMP; + sccb.evbuf.event_id = 4712; + sccb.evbuf.asa_size = SDIAS_ASA_SIZE_64; + 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 (sdias_evbuf.event_status) { + case SDIAS_EVSTATE_ALL_STORED: + TRACE("all stored\n"); + break; + case SDIAS_EVSTATE_PART_STORED: + TRACE("part stored: %i\n", sdias_evbuf.blk_cnt); + break; + case SDIAS_EVSTATE_NO_DATA: + TRACE("no data\n"); + /* fall through */ + default: + pr_err("Error from SCLP while copying hsa. Event status = %x\n", + sdias_evbuf.event_status); + rc = -EIO; + } +out: + mutex_unlock(&sdias_mutex); + return rc; +} + +static int __init sclp_sdias_register_check(void) +{ + int rc; + + 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\n"); + 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\n"); + 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) +{ + 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); + if (sclp_sdias_init_sync() == 0) + goto out; + if (sclp_sdias_init_async() == 0) + goto out; + TRACE("init failed\n"); + return -ENODEV; +out: + TRACE("init done\n"); + return 0; +} + +void __exit sclp_sdias_exit(void) +{ + debug_unregister(sdias_dbf); + sclp_unregister(&sclp_sdias_register); +} -- cgit 1.2.3-korg