Merge branch 'linux-2.6' into for-2.6.22

1 files changed, 255 insertions, 0 deletions

diff --git a/drivers/s390/char/sclp_sdias.c b/drivers/s390/char/sclp_sdias.c
new file mode 100644
index 00000000000..52283daddae
--- /dev/null
+++ b/drivers/s390/char/sclp_sdias.c
@@ -0,0 +1,255 @@
+/*
+ * Sclp "store data in absolut storage"
+ *
+ * Copyright IBM Corp. 2003,2007
+ * Author(s): Michael Holzheu
+ */
+
+#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 ERROR_MSG(x...) printk ( KERN_ALERT "SDIAS: " 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 *sccb;
+
+	sccb = (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) {
+		ERROR_MSG("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:
+			ERROR_MSG("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) {
+		ERROR_MSG("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:
+			ERROR_MSG("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 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) {
+		ERROR_MSG("sclp register failed\n");
+		return rc;
+	}
+	init_waitqueue_head(&sdias_wq);
+	TRACE("init done\n");
+	return 0;
+}
+
+void __exit sdias_exit(void)
+{
+	debug_unregister(sdias_dbf);
+	sclp_unregister(&sclp_sdias_register);
+}