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d608f45ed3
Remove the repeated word 'and' from comments Signed-off-by: Jiang Jian <jiangjian@cdjrlc.com> Reviewed-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/20220622142713.14187-1-jiangjian@cdjrlc.com Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
1313 lines
35 KiB
C
1313 lines
35 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* core function to access sclp interface
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*
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* Copyright IBM Corp. 1999, 2009
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*
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* Author(s): Martin Peschke <mpeschke@de.ibm.com>
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* Martin Schwidefsky <schwidefsky@de.ibm.com>
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*/
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#include <linux/kernel_stat.h>
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#include <linux/module.h>
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#include <linux/err.h>
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#include <linux/panic_notifier.h>
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#include <linux/spinlock.h>
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#include <linux/interrupt.h>
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#include <linux/timer.h>
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#include <linux/reboot.h>
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#include <linux/jiffies.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <asm/types.h>
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#include <asm/irq.h>
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#include <asm/debug.h>
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#include "sclp.h"
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#define SCLP_HEADER "sclp: "
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struct sclp_trace_entry {
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char id[4] __nonstring;
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u32 a;
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u64 b;
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};
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#define SCLP_TRACE_ENTRY_SIZE sizeof(struct sclp_trace_entry)
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#define SCLP_TRACE_MAX_SIZE 128
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#define SCLP_TRACE_EVENT_MAX_SIZE 64
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/* Debug trace area intended for all entries in abbreviated form. */
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DEFINE_STATIC_DEBUG_INFO(sclp_debug, "sclp", 8, 1, SCLP_TRACE_ENTRY_SIZE,
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&debug_hex_ascii_view);
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/* Error trace area intended for full entries relating to failed requests. */
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DEFINE_STATIC_DEBUG_INFO(sclp_debug_err, "sclp_err", 4, 1,
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SCLP_TRACE_ENTRY_SIZE, &debug_hex_ascii_view);
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/* Lock to protect internal data consistency. */
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static DEFINE_SPINLOCK(sclp_lock);
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/* Mask of events that we can send to the sclp interface. */
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static sccb_mask_t sclp_receive_mask;
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/* Mask of events that we can receive from the sclp interface. */
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static sccb_mask_t sclp_send_mask;
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/* List of registered event listeners and senders. */
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static LIST_HEAD(sclp_reg_list);
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/* List of queued requests. */
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static LIST_HEAD(sclp_req_queue);
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/* Data for read and init requests. */
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static struct sclp_req sclp_read_req;
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static struct sclp_req sclp_init_req;
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static void *sclp_read_sccb;
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static struct init_sccb *sclp_init_sccb;
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/* Number of console pages to allocate, used by sclp_con.c and sclp_vt220.c */
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int sclp_console_pages = SCLP_CONSOLE_PAGES;
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/* Flag to indicate if buffer pages are dropped on buffer full condition */
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int sclp_console_drop = 1;
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/* Number of times the console dropped buffer pages */
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unsigned long sclp_console_full;
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/* The currently active SCLP command word. */
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static sclp_cmdw_t active_cmd;
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static inline void sclp_trace(int prio, char *id, u32 a, u64 b, bool err)
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{
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struct sclp_trace_entry e;
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memset(&e, 0, sizeof(e));
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strncpy(e.id, id, sizeof(e.id));
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e.a = a;
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e.b = b;
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debug_event(&sclp_debug, prio, &e, sizeof(e));
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if (err)
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debug_event(&sclp_debug_err, 0, &e, sizeof(e));
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}
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static inline int no_zeroes_len(void *data, int len)
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{
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char *d = data;
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/* Minimize trace area usage by not tracing trailing zeroes. */
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while (len > SCLP_TRACE_ENTRY_SIZE && d[len - 1] == 0)
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len--;
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return len;
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}
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static inline void sclp_trace_bin(int prio, void *d, int len, int errlen)
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{
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debug_event(&sclp_debug, prio, d, no_zeroes_len(d, len));
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if (errlen)
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debug_event(&sclp_debug_err, 0, d, no_zeroes_len(d, errlen));
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}
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static inline int abbrev_len(sclp_cmdw_t cmd, struct sccb_header *sccb)
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{
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struct evbuf_header *evbuf = (struct evbuf_header *)(sccb + 1);
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int len = sccb->length, limit = SCLP_TRACE_MAX_SIZE;
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/* Full SCCB tracing if debug level is set to max. */
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if (sclp_debug.level == DEBUG_MAX_LEVEL)
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return len;
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/* Minimal tracing for console writes. */
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if (cmd == SCLP_CMDW_WRITE_EVENT_DATA &&
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(evbuf->type == EVTYP_MSG || evbuf->type == EVTYP_VT220MSG))
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limit = SCLP_TRACE_ENTRY_SIZE;
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return min(len, limit);
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}
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static inline void sclp_trace_sccb(int prio, char *id, u32 a, u64 b,
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sclp_cmdw_t cmd, struct sccb_header *sccb,
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bool err)
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{
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sclp_trace(prio, id, a, b, err);
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if (sccb) {
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sclp_trace_bin(prio + 1, sccb, abbrev_len(cmd, sccb),
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err ? sccb->length : 0);
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}
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}
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static inline void sclp_trace_evbuf(int prio, char *id, u32 a, u64 b,
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struct evbuf_header *evbuf, bool err)
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{
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sclp_trace(prio, id, a, b, err);
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sclp_trace_bin(prio + 1, evbuf,
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min((int)evbuf->length, (int)SCLP_TRACE_EVENT_MAX_SIZE),
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err ? evbuf->length : 0);
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}
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static inline void sclp_trace_req(int prio, char *id, struct sclp_req *req,
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bool err)
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{
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struct sccb_header *sccb = req->sccb;
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union {
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struct {
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u16 status;
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u16 response;
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u16 timeout;
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u16 start_count;
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};
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u64 b;
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} summary;
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summary.status = req->status;
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summary.response = sccb ? sccb->response_code : 0;
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summary.timeout = (u16)req->queue_timeout;
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summary.start_count = (u16)req->start_count;
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sclp_trace(prio, id, __pa(sccb), summary.b, err);
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}
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static inline void sclp_trace_register(int prio, char *id, u32 a, u64 b,
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struct sclp_register *reg)
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{
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struct {
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u64 receive;
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u64 send;
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} d;
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d.receive = reg->receive_mask;
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d.send = reg->send_mask;
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sclp_trace(prio, id, a, b, false);
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sclp_trace_bin(prio, &d, sizeof(d), 0);
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}
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static int __init sclp_setup_console_pages(char *str)
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{
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int pages, rc;
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rc = kstrtoint(str, 0, &pages);
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if (!rc && pages >= SCLP_CONSOLE_PAGES)
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sclp_console_pages = pages;
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return 1;
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}
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__setup("sclp_con_pages=", sclp_setup_console_pages);
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static int __init sclp_setup_console_drop(char *str)
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{
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int drop, rc;
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rc = kstrtoint(str, 0, &drop);
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if (!rc)
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sclp_console_drop = drop;
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return 1;
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}
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__setup("sclp_con_drop=", sclp_setup_console_drop);
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/* Timer for request retries. */
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static struct timer_list sclp_request_timer;
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/* Timer for queued requests. */
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static struct timer_list sclp_queue_timer;
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/* Internal state: is a request active at the sclp? */
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static volatile enum sclp_running_state_t {
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sclp_running_state_idle,
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sclp_running_state_running,
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sclp_running_state_reset_pending
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} sclp_running_state = sclp_running_state_idle;
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/* Internal state: is a read request pending? */
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static volatile enum sclp_reading_state_t {
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sclp_reading_state_idle,
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sclp_reading_state_reading
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} sclp_reading_state = sclp_reading_state_idle;
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/* Internal state: is the driver currently serving requests? */
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static volatile enum sclp_activation_state_t {
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sclp_activation_state_active,
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sclp_activation_state_deactivating,
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sclp_activation_state_inactive,
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sclp_activation_state_activating
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} sclp_activation_state = sclp_activation_state_active;
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/* Internal state: is an init mask request pending? */
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static volatile enum sclp_mask_state_t {
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sclp_mask_state_idle,
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sclp_mask_state_initializing
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} sclp_mask_state = sclp_mask_state_idle;
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/* Maximum retry counts */
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#define SCLP_INIT_RETRY 3
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#define SCLP_MASK_RETRY 3
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/* Timeout intervals in seconds.*/
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#define SCLP_BUSY_INTERVAL 10
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#define SCLP_RETRY_INTERVAL 30
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static void sclp_request_timeout(bool force_restart);
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static void sclp_process_queue(void);
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static void __sclp_make_read_req(void);
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static int sclp_init_mask(int calculate);
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static int sclp_init(void);
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static void
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__sclp_queue_read_req(void)
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{
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if (sclp_reading_state == sclp_reading_state_idle) {
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sclp_reading_state = sclp_reading_state_reading;
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__sclp_make_read_req();
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/* Add request to head of queue */
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list_add(&sclp_read_req.list, &sclp_req_queue);
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}
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}
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/* Set up request retry timer. Called while sclp_lock is locked. */
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static inline void
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__sclp_set_request_timer(unsigned long time, void (*cb)(struct timer_list *))
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{
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del_timer(&sclp_request_timer);
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sclp_request_timer.function = cb;
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sclp_request_timer.expires = jiffies + time;
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add_timer(&sclp_request_timer);
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}
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static void sclp_request_timeout_restart(struct timer_list *unused)
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{
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sclp_request_timeout(true);
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}
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static void sclp_request_timeout_normal(struct timer_list *unused)
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{
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sclp_request_timeout(false);
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}
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/* Request timeout handler. Restart the request queue. If force_restart,
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* force restart of running request. */
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static void sclp_request_timeout(bool force_restart)
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{
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unsigned long flags;
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/* TMO: A timeout occurred (a=force_restart) */
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sclp_trace(2, "TMO", force_restart, 0, true);
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spin_lock_irqsave(&sclp_lock, flags);
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if (force_restart) {
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if (sclp_running_state == sclp_running_state_running) {
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/* Break running state and queue NOP read event request
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* to get a defined interface state. */
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__sclp_queue_read_req();
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sclp_running_state = sclp_running_state_idle;
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}
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} else {
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__sclp_set_request_timer(SCLP_BUSY_INTERVAL * HZ,
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sclp_request_timeout_normal);
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}
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spin_unlock_irqrestore(&sclp_lock, flags);
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sclp_process_queue();
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}
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/*
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* Returns the expire value in jiffies of the next pending request timeout,
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* if any. Needs to be called with sclp_lock.
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*/
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static unsigned long __sclp_req_queue_find_next_timeout(void)
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{
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unsigned long expires_next = 0;
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struct sclp_req *req;
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list_for_each_entry(req, &sclp_req_queue, list) {
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if (!req->queue_expires)
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continue;
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if (!expires_next ||
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(time_before(req->queue_expires, expires_next)))
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expires_next = req->queue_expires;
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}
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return expires_next;
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}
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/*
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* Returns expired request, if any, and removes it from the list.
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*/
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static struct sclp_req *__sclp_req_queue_remove_expired_req(void)
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{
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unsigned long flags, now;
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struct sclp_req *req;
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spin_lock_irqsave(&sclp_lock, flags);
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now = jiffies;
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/* Don't need list_for_each_safe because we break out after list_del */
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list_for_each_entry(req, &sclp_req_queue, list) {
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if (!req->queue_expires)
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continue;
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if (time_before_eq(req->queue_expires, now)) {
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if (req->status == SCLP_REQ_QUEUED) {
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req->status = SCLP_REQ_QUEUED_TIMEOUT;
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list_del(&req->list);
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goto out;
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}
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}
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}
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req = NULL;
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out:
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spin_unlock_irqrestore(&sclp_lock, flags);
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return req;
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}
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/*
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* Timeout handler for queued requests. Removes request from list and
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* invokes callback. This timer can be set per request in situations where
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* waiting too long would be harmful to the system, e.g. during SE reboot.
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*/
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static void sclp_req_queue_timeout(struct timer_list *unused)
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{
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unsigned long flags, expires_next;
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struct sclp_req *req;
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do {
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req = __sclp_req_queue_remove_expired_req();
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if (req) {
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/* RQTM: Request timed out (a=sccb, b=summary) */
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sclp_trace_req(2, "RQTM", req, true);
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}
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if (req && req->callback)
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req->callback(req, req->callback_data);
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} while (req);
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spin_lock_irqsave(&sclp_lock, flags);
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expires_next = __sclp_req_queue_find_next_timeout();
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if (expires_next)
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mod_timer(&sclp_queue_timer, expires_next);
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spin_unlock_irqrestore(&sclp_lock, flags);
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}
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static int sclp_service_call_trace(sclp_cmdw_t command, void *sccb)
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{
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static u64 srvc_count;
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int rc;
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/* SRV1: Service call about to be issued (a=command, b=sccb address) */
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sclp_trace_sccb(0, "SRV1", command, (u64)sccb, command, sccb, false);
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rc = sclp_service_call(command, sccb);
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/* SRV2: Service call was issued (a=rc, b=SRVC sequence number) */
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sclp_trace(0, "SRV2", -rc, ++srvc_count, rc != 0);
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if (rc == 0)
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active_cmd = command;
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return rc;
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}
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/* Try to start a request. Return zero if the request was successfully
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* started or if it will be started at a later time. Return non-zero otherwise.
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* Called while sclp_lock is locked. */
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static int
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__sclp_start_request(struct sclp_req *req)
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{
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int rc;
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if (sclp_running_state != sclp_running_state_idle)
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return 0;
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del_timer(&sclp_request_timer);
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rc = sclp_service_call_trace(req->command, req->sccb);
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req->start_count++;
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if (rc == 0) {
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/* Successfully started request */
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req->status = SCLP_REQ_RUNNING;
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sclp_running_state = sclp_running_state_running;
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__sclp_set_request_timer(SCLP_RETRY_INTERVAL * HZ,
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sclp_request_timeout_restart);
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return 0;
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} else if (rc == -EBUSY) {
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/* Try again later */
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__sclp_set_request_timer(SCLP_BUSY_INTERVAL * HZ,
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sclp_request_timeout_normal);
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return 0;
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}
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/* Request failed */
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req->status = SCLP_REQ_FAILED;
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return rc;
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}
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/* Try to start queued requests. */
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static void
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sclp_process_queue(void)
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{
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struct sclp_req *req;
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int rc;
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unsigned long flags;
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spin_lock_irqsave(&sclp_lock, flags);
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if (sclp_running_state != sclp_running_state_idle) {
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spin_unlock_irqrestore(&sclp_lock, flags);
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return;
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}
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del_timer(&sclp_request_timer);
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while (!list_empty(&sclp_req_queue)) {
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req = list_entry(sclp_req_queue.next, struct sclp_req, list);
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rc = __sclp_start_request(req);
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if (rc == 0)
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break;
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/* Request failed */
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if (req->start_count > 1) {
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/* Cannot abort already submitted request - could still
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* be active at the SCLP */
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__sclp_set_request_timer(SCLP_BUSY_INTERVAL * HZ,
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sclp_request_timeout_normal);
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break;
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}
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/* Post-processing for aborted request */
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list_del(&req->list);
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/* RQAB: Request aborted (a=sccb, b=summary) */
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sclp_trace_req(2, "RQAB", req, true);
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if (req->callback) {
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spin_unlock_irqrestore(&sclp_lock, flags);
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req->callback(req, req->callback_data);
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spin_lock_irqsave(&sclp_lock, flags);
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}
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}
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spin_unlock_irqrestore(&sclp_lock, flags);
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}
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static int __sclp_can_add_request(struct sclp_req *req)
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{
|
|
if (req == &sclp_init_req)
|
|
return 1;
|
|
if (sclp_init_state != sclp_init_state_initialized)
|
|
return 0;
|
|
if (sclp_activation_state != sclp_activation_state_active)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
/* Queue a new request. Return zero on success, non-zero otherwise. */
|
|
int
|
|
sclp_add_request(struct sclp_req *req)
|
|
{
|
|
unsigned long flags;
|
|
int rc;
|
|
|
|
spin_lock_irqsave(&sclp_lock, flags);
|
|
if (!__sclp_can_add_request(req)) {
|
|
spin_unlock_irqrestore(&sclp_lock, flags);
|
|
return -EIO;
|
|
}
|
|
|
|
/* RQAD: Request was added (a=sccb, b=caller) */
|
|
sclp_trace(2, "RQAD", __pa(req->sccb), _RET_IP_, false);
|
|
|
|
req->status = SCLP_REQ_QUEUED;
|
|
req->start_count = 0;
|
|
list_add_tail(&req->list, &sclp_req_queue);
|
|
rc = 0;
|
|
if (req->queue_timeout) {
|
|
req->queue_expires = jiffies + req->queue_timeout * HZ;
|
|
if (!timer_pending(&sclp_queue_timer) ||
|
|
time_after(sclp_queue_timer.expires, req->queue_expires))
|
|
mod_timer(&sclp_queue_timer, req->queue_expires);
|
|
} else
|
|
req->queue_expires = 0;
|
|
/* Start if request is first in list */
|
|
if (sclp_running_state == sclp_running_state_idle &&
|
|
req->list.prev == &sclp_req_queue) {
|
|
rc = __sclp_start_request(req);
|
|
if (rc)
|
|
list_del(&req->list);
|
|
}
|
|
spin_unlock_irqrestore(&sclp_lock, flags);
|
|
return rc;
|
|
}
|
|
|
|
EXPORT_SYMBOL(sclp_add_request);
|
|
|
|
/* Dispatch events found in request buffer to registered listeners. Return 0
|
|
* if all events were dispatched, non-zero otherwise. */
|
|
static int
|
|
sclp_dispatch_evbufs(struct sccb_header *sccb)
|
|
{
|
|
unsigned long flags;
|
|
struct evbuf_header *evbuf;
|
|
struct list_head *l;
|
|
struct sclp_register *reg;
|
|
int offset;
|
|
int rc;
|
|
|
|
spin_lock_irqsave(&sclp_lock, flags);
|
|
rc = 0;
|
|
for (offset = sizeof(struct sccb_header); offset < sccb->length;
|
|
offset += evbuf->length) {
|
|
evbuf = (struct evbuf_header *) ((addr_t) sccb + offset);
|
|
/* Check for malformed hardware response */
|
|
if (evbuf->length == 0)
|
|
break;
|
|
/* Search for event handler */
|
|
reg = NULL;
|
|
list_for_each(l, &sclp_reg_list) {
|
|
reg = list_entry(l, struct sclp_register, list);
|
|
if (reg->receive_mask & SCLP_EVTYP_MASK(evbuf->type))
|
|
break;
|
|
else
|
|
reg = NULL;
|
|
}
|
|
|
|
/* EVNT: Event callback (b=receiver) */
|
|
sclp_trace_evbuf(2, "EVNT", 0, reg ? (u64)reg->receiver_fn : 0,
|
|
evbuf, !reg);
|
|
|
|
if (reg && reg->receiver_fn) {
|
|
spin_unlock_irqrestore(&sclp_lock, flags);
|
|
reg->receiver_fn(evbuf);
|
|
spin_lock_irqsave(&sclp_lock, flags);
|
|
} else if (reg == NULL)
|
|
rc = -EOPNOTSUPP;
|
|
}
|
|
spin_unlock_irqrestore(&sclp_lock, flags);
|
|
return rc;
|
|
}
|
|
|
|
/* Read event data request callback. */
|
|
static void
|
|
sclp_read_cb(struct sclp_req *req, void *data)
|
|
{
|
|
unsigned long flags;
|
|
struct sccb_header *sccb;
|
|
|
|
sccb = (struct sccb_header *) req->sccb;
|
|
if (req->status == SCLP_REQ_DONE && (sccb->response_code == 0x20 ||
|
|
sccb->response_code == 0x220))
|
|
sclp_dispatch_evbufs(sccb);
|
|
spin_lock_irqsave(&sclp_lock, flags);
|
|
sclp_reading_state = sclp_reading_state_idle;
|
|
spin_unlock_irqrestore(&sclp_lock, flags);
|
|
}
|
|
|
|
/* Prepare read event data request. Called while sclp_lock is locked. */
|
|
static void __sclp_make_read_req(void)
|
|
{
|
|
struct sccb_header *sccb;
|
|
|
|
sccb = (struct sccb_header *) sclp_read_sccb;
|
|
clear_page(sccb);
|
|
memset(&sclp_read_req, 0, sizeof(struct sclp_req));
|
|
sclp_read_req.command = SCLP_CMDW_READ_EVENT_DATA;
|
|
sclp_read_req.status = SCLP_REQ_QUEUED;
|
|
sclp_read_req.start_count = 0;
|
|
sclp_read_req.callback = sclp_read_cb;
|
|
sclp_read_req.sccb = sccb;
|
|
sccb->length = PAGE_SIZE;
|
|
sccb->function_code = 0;
|
|
sccb->control_mask[2] = 0x80;
|
|
}
|
|
|
|
/* Search request list for request with matching sccb. Return request if found,
|
|
* NULL otherwise. Called while sclp_lock is locked. */
|
|
static inline struct sclp_req *
|
|
__sclp_find_req(u32 sccb)
|
|
{
|
|
struct list_head *l;
|
|
struct sclp_req *req;
|
|
|
|
list_for_each(l, &sclp_req_queue) {
|
|
req = list_entry(l, struct sclp_req, list);
|
|
if (sccb == __pa(req->sccb))
|
|
return req;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static bool ok_response(u32 sccb_int, sclp_cmdw_t cmd)
|
|
{
|
|
struct sccb_header *sccb = (struct sccb_header *)__va(sccb_int);
|
|
struct evbuf_header *evbuf;
|
|
u16 response;
|
|
|
|
if (!sccb)
|
|
return true;
|
|
|
|
/* Check SCCB response. */
|
|
response = sccb->response_code & 0xff;
|
|
if (response != 0x10 && response != 0x20)
|
|
return false;
|
|
|
|
/* Check event-processed flag on outgoing events. */
|
|
if (cmd == SCLP_CMDW_WRITE_EVENT_DATA) {
|
|
evbuf = (struct evbuf_header *)(sccb + 1);
|
|
if (!(evbuf->flags & 0x80))
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/* Handler for external interruption. Perform request post-processing.
|
|
* Prepare read event data request if necessary. Start processing of next
|
|
* request on queue. */
|
|
static void sclp_interrupt_handler(struct ext_code ext_code,
|
|
unsigned int param32, unsigned long param64)
|
|
{
|
|
struct sclp_req *req;
|
|
u32 finished_sccb;
|
|
u32 evbuf_pending;
|
|
|
|
inc_irq_stat(IRQEXT_SCP);
|
|
spin_lock(&sclp_lock);
|
|
finished_sccb = param32 & 0xfffffff8;
|
|
evbuf_pending = param32 & 0x3;
|
|
|
|
/* INT: Interrupt received (a=intparm, b=cmd) */
|
|
sclp_trace_sccb(0, "INT", param32, active_cmd, active_cmd,
|
|
(struct sccb_header *)__va(finished_sccb),
|
|
!ok_response(finished_sccb, active_cmd));
|
|
|
|
if (finished_sccb) {
|
|
del_timer(&sclp_request_timer);
|
|
sclp_running_state = sclp_running_state_reset_pending;
|
|
req = __sclp_find_req(finished_sccb);
|
|
if (req) {
|
|
/* Request post-processing */
|
|
list_del(&req->list);
|
|
req->status = SCLP_REQ_DONE;
|
|
|
|
/* RQOK: Request success (a=sccb, b=summary) */
|
|
sclp_trace_req(2, "RQOK", req, false);
|
|
|
|
if (req->callback) {
|
|
spin_unlock(&sclp_lock);
|
|
req->callback(req, req->callback_data);
|
|
spin_lock(&sclp_lock);
|
|
}
|
|
} else {
|
|
/* UNEX: Unexpected SCCB completion (a=sccb address) */
|
|
sclp_trace(0, "UNEX", finished_sccb, 0, true);
|
|
}
|
|
sclp_running_state = sclp_running_state_idle;
|
|
active_cmd = 0;
|
|
}
|
|
if (evbuf_pending &&
|
|
sclp_activation_state == sclp_activation_state_active)
|
|
__sclp_queue_read_req();
|
|
spin_unlock(&sclp_lock);
|
|
sclp_process_queue();
|
|
}
|
|
|
|
/* Convert interval in jiffies to TOD ticks. */
|
|
static inline u64
|
|
sclp_tod_from_jiffies(unsigned long jiffies)
|
|
{
|
|
return (u64) (jiffies / HZ) << 32;
|
|
}
|
|
|
|
/* Wait until a currently running request finished. Note: while this function
|
|
* is running, no timers are served on the calling CPU. */
|
|
void
|
|
sclp_sync_wait(void)
|
|
{
|
|
unsigned long long old_tick;
|
|
unsigned long flags;
|
|
unsigned long cr0, cr0_sync;
|
|
static u64 sync_count;
|
|
u64 timeout;
|
|
int irq_context;
|
|
|
|
/* SYN1: Synchronous wait start (a=runstate, b=sync count) */
|
|
sclp_trace(4, "SYN1", sclp_running_state, ++sync_count, false);
|
|
|
|
/* We'll be disabling timer interrupts, so we need a custom timeout
|
|
* mechanism */
|
|
timeout = 0;
|
|
if (timer_pending(&sclp_request_timer)) {
|
|
/* Get timeout TOD value */
|
|
timeout = get_tod_clock_fast() +
|
|
sclp_tod_from_jiffies(sclp_request_timer.expires -
|
|
jiffies);
|
|
}
|
|
local_irq_save(flags);
|
|
/* Prevent bottom half from executing once we force interrupts open */
|
|
irq_context = in_interrupt();
|
|
if (!irq_context)
|
|
local_bh_disable();
|
|
/* Enable service-signal interruption, disable timer interrupts */
|
|
old_tick = local_tick_disable();
|
|
trace_hardirqs_on();
|
|
__ctl_store(cr0, 0, 0);
|
|
cr0_sync = cr0 & ~CR0_IRQ_SUBCLASS_MASK;
|
|
cr0_sync |= 1UL << (63 - 54);
|
|
__ctl_load(cr0_sync, 0, 0);
|
|
__arch_local_irq_stosm(0x01);
|
|
/* Loop until driver state indicates finished request */
|
|
while (sclp_running_state != sclp_running_state_idle) {
|
|
/* Check for expired request timer */
|
|
if (get_tod_clock_fast() > timeout && del_timer(&sclp_request_timer))
|
|
sclp_request_timer.function(&sclp_request_timer);
|
|
cpu_relax();
|
|
}
|
|
local_irq_disable();
|
|
__ctl_load(cr0, 0, 0);
|
|
if (!irq_context)
|
|
_local_bh_enable();
|
|
local_tick_enable(old_tick);
|
|
local_irq_restore(flags);
|
|
|
|
/* SYN2: Synchronous wait end (a=runstate, b=sync_count) */
|
|
sclp_trace(4, "SYN2", sclp_running_state, sync_count, false);
|
|
}
|
|
EXPORT_SYMBOL(sclp_sync_wait);
|
|
|
|
/* Dispatch changes in send and receive mask to registered listeners. */
|
|
static void
|
|
sclp_dispatch_state_change(void)
|
|
{
|
|
struct list_head *l;
|
|
struct sclp_register *reg;
|
|
unsigned long flags;
|
|
sccb_mask_t receive_mask;
|
|
sccb_mask_t send_mask;
|
|
|
|
do {
|
|
spin_lock_irqsave(&sclp_lock, flags);
|
|
reg = NULL;
|
|
list_for_each(l, &sclp_reg_list) {
|
|
reg = list_entry(l, struct sclp_register, list);
|
|
receive_mask = reg->send_mask & sclp_receive_mask;
|
|
send_mask = reg->receive_mask & sclp_send_mask;
|
|
if (reg->sclp_receive_mask != receive_mask ||
|
|
reg->sclp_send_mask != send_mask) {
|
|
reg->sclp_receive_mask = receive_mask;
|
|
reg->sclp_send_mask = send_mask;
|
|
break;
|
|
} else
|
|
reg = NULL;
|
|
}
|
|
spin_unlock_irqrestore(&sclp_lock, flags);
|
|
if (reg && reg->state_change_fn) {
|
|
/* STCG: State-change callback (b=callback) */
|
|
sclp_trace(2, "STCG", 0, (u64)reg->state_change_fn,
|
|
false);
|
|
|
|
reg->state_change_fn(reg);
|
|
}
|
|
} while (reg);
|
|
}
|
|
|
|
struct sclp_statechangebuf {
|
|
struct evbuf_header header;
|
|
u8 validity_sclp_active_facility_mask : 1;
|
|
u8 validity_sclp_receive_mask : 1;
|
|
u8 validity_sclp_send_mask : 1;
|
|
u8 validity_read_data_function_mask : 1;
|
|
u16 _zeros : 12;
|
|
u16 mask_length;
|
|
u64 sclp_active_facility_mask;
|
|
u8 masks[2 * 1021 + 4]; /* variable length */
|
|
/*
|
|
* u8 sclp_receive_mask[mask_length];
|
|
* u8 sclp_send_mask[mask_length];
|
|
* u32 read_data_function_mask;
|
|
*/
|
|
} __attribute__((packed));
|
|
|
|
|
|
/* State change event callback. Inform listeners of changes. */
|
|
static void
|
|
sclp_state_change_cb(struct evbuf_header *evbuf)
|
|
{
|
|
unsigned long flags;
|
|
struct sclp_statechangebuf *scbuf;
|
|
|
|
BUILD_BUG_ON(sizeof(struct sclp_statechangebuf) > PAGE_SIZE);
|
|
|
|
scbuf = (struct sclp_statechangebuf *) evbuf;
|
|
spin_lock_irqsave(&sclp_lock, flags);
|
|
if (scbuf->validity_sclp_receive_mask)
|
|
sclp_receive_mask = sccb_get_recv_mask(scbuf);
|
|
if (scbuf->validity_sclp_send_mask)
|
|
sclp_send_mask = sccb_get_send_mask(scbuf);
|
|
spin_unlock_irqrestore(&sclp_lock, flags);
|
|
if (scbuf->validity_sclp_active_facility_mask)
|
|
sclp.facilities = scbuf->sclp_active_facility_mask;
|
|
sclp_dispatch_state_change();
|
|
}
|
|
|
|
static struct sclp_register sclp_state_change_event = {
|
|
.receive_mask = EVTYP_STATECHANGE_MASK,
|
|
.receiver_fn = sclp_state_change_cb
|
|
};
|
|
|
|
/* Calculate receive and send mask of currently registered listeners.
|
|
* Called while sclp_lock is locked. */
|
|
static inline void
|
|
__sclp_get_mask(sccb_mask_t *receive_mask, sccb_mask_t *send_mask)
|
|
{
|
|
struct list_head *l;
|
|
struct sclp_register *t;
|
|
|
|
*receive_mask = 0;
|
|
*send_mask = 0;
|
|
list_for_each(l, &sclp_reg_list) {
|
|
t = list_entry(l, struct sclp_register, list);
|
|
*receive_mask |= t->receive_mask;
|
|
*send_mask |= t->send_mask;
|
|
}
|
|
}
|
|
|
|
/* Register event listener. Return 0 on success, non-zero otherwise. */
|
|
int
|
|
sclp_register(struct sclp_register *reg)
|
|
{
|
|
unsigned long flags;
|
|
sccb_mask_t receive_mask;
|
|
sccb_mask_t send_mask;
|
|
int rc;
|
|
|
|
/* REG: Event listener registered (b=caller) */
|
|
sclp_trace_register(2, "REG", 0, _RET_IP_, reg);
|
|
|
|
rc = sclp_init();
|
|
if (rc)
|
|
return rc;
|
|
spin_lock_irqsave(&sclp_lock, flags);
|
|
/* Check event mask for collisions */
|
|
__sclp_get_mask(&receive_mask, &send_mask);
|
|
if (reg->receive_mask & receive_mask || reg->send_mask & send_mask) {
|
|
spin_unlock_irqrestore(&sclp_lock, flags);
|
|
return -EBUSY;
|
|
}
|
|
/* Trigger initial state change callback */
|
|
reg->sclp_receive_mask = 0;
|
|
reg->sclp_send_mask = 0;
|
|
list_add(®->list, &sclp_reg_list);
|
|
spin_unlock_irqrestore(&sclp_lock, flags);
|
|
rc = sclp_init_mask(1);
|
|
if (rc) {
|
|
spin_lock_irqsave(&sclp_lock, flags);
|
|
list_del(®->list);
|
|
spin_unlock_irqrestore(&sclp_lock, flags);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
EXPORT_SYMBOL(sclp_register);
|
|
|
|
/* Unregister event listener. */
|
|
void
|
|
sclp_unregister(struct sclp_register *reg)
|
|
{
|
|
unsigned long flags;
|
|
|
|
/* UREG: Event listener unregistered (b=caller) */
|
|
sclp_trace_register(2, "UREG", 0, _RET_IP_, reg);
|
|
|
|
spin_lock_irqsave(&sclp_lock, flags);
|
|
list_del(®->list);
|
|
spin_unlock_irqrestore(&sclp_lock, flags);
|
|
sclp_init_mask(1);
|
|
}
|
|
|
|
EXPORT_SYMBOL(sclp_unregister);
|
|
|
|
/* Remove event buffers which are marked processed. Return the number of
|
|
* remaining event buffers. */
|
|
int
|
|
sclp_remove_processed(struct sccb_header *sccb)
|
|
{
|
|
struct evbuf_header *evbuf;
|
|
int unprocessed;
|
|
u16 remaining;
|
|
|
|
evbuf = (struct evbuf_header *) (sccb + 1);
|
|
unprocessed = 0;
|
|
remaining = sccb->length - sizeof(struct sccb_header);
|
|
while (remaining > 0) {
|
|
remaining -= evbuf->length;
|
|
if (evbuf->flags & 0x80) {
|
|
sccb->length -= evbuf->length;
|
|
memcpy(evbuf, (void *) ((addr_t) evbuf + evbuf->length),
|
|
remaining);
|
|
} else {
|
|
unprocessed++;
|
|
evbuf = (struct evbuf_header *)
|
|
((addr_t) evbuf + evbuf->length);
|
|
}
|
|
}
|
|
return unprocessed;
|
|
}
|
|
|
|
EXPORT_SYMBOL(sclp_remove_processed);
|
|
|
|
/* Prepare init mask request. Called while sclp_lock is locked. */
|
|
static inline void
|
|
__sclp_make_init_req(sccb_mask_t receive_mask, sccb_mask_t send_mask)
|
|
{
|
|
struct init_sccb *sccb = sclp_init_sccb;
|
|
|
|
clear_page(sccb);
|
|
memset(&sclp_init_req, 0, sizeof(struct sclp_req));
|
|
sclp_init_req.command = SCLP_CMDW_WRITE_EVENT_MASK;
|
|
sclp_init_req.status = SCLP_REQ_FILLED;
|
|
sclp_init_req.start_count = 0;
|
|
sclp_init_req.callback = NULL;
|
|
sclp_init_req.callback_data = NULL;
|
|
sclp_init_req.sccb = sccb;
|
|
sccb->header.length = sizeof(*sccb);
|
|
if (sclp_mask_compat_mode)
|
|
sccb->mask_length = SCLP_MASK_SIZE_COMPAT;
|
|
else
|
|
sccb->mask_length = sizeof(sccb_mask_t);
|
|
sccb_set_recv_mask(sccb, receive_mask);
|
|
sccb_set_send_mask(sccb, send_mask);
|
|
sccb_set_sclp_recv_mask(sccb, 0);
|
|
sccb_set_sclp_send_mask(sccb, 0);
|
|
}
|
|
|
|
/* Start init mask request. If calculate is non-zero, calculate the mask as
|
|
* requested by registered listeners. Use zero mask otherwise. Return 0 on
|
|
* success, non-zero otherwise. */
|
|
static int
|
|
sclp_init_mask(int calculate)
|
|
{
|
|
unsigned long flags;
|
|
struct init_sccb *sccb = sclp_init_sccb;
|
|
sccb_mask_t receive_mask;
|
|
sccb_mask_t send_mask;
|
|
int retry;
|
|
int rc;
|
|
unsigned long wait;
|
|
|
|
spin_lock_irqsave(&sclp_lock, flags);
|
|
/* Check if interface is in appropriate state */
|
|
if (sclp_mask_state != sclp_mask_state_idle) {
|
|
spin_unlock_irqrestore(&sclp_lock, flags);
|
|
return -EBUSY;
|
|
}
|
|
if (sclp_activation_state == sclp_activation_state_inactive) {
|
|
spin_unlock_irqrestore(&sclp_lock, flags);
|
|
return -EINVAL;
|
|
}
|
|
sclp_mask_state = sclp_mask_state_initializing;
|
|
/* Determine mask */
|
|
if (calculate)
|
|
__sclp_get_mask(&receive_mask, &send_mask);
|
|
else {
|
|
receive_mask = 0;
|
|
send_mask = 0;
|
|
}
|
|
rc = -EIO;
|
|
for (retry = 0; retry <= SCLP_MASK_RETRY; retry++) {
|
|
/* Prepare request */
|
|
__sclp_make_init_req(receive_mask, send_mask);
|
|
spin_unlock_irqrestore(&sclp_lock, flags);
|
|
if (sclp_add_request(&sclp_init_req)) {
|
|
/* Try again later */
|
|
wait = jiffies + SCLP_BUSY_INTERVAL * HZ;
|
|
while (time_before(jiffies, wait))
|
|
sclp_sync_wait();
|
|
spin_lock_irqsave(&sclp_lock, flags);
|
|
continue;
|
|
}
|
|
while (sclp_init_req.status != SCLP_REQ_DONE &&
|
|
sclp_init_req.status != SCLP_REQ_FAILED)
|
|
sclp_sync_wait();
|
|
spin_lock_irqsave(&sclp_lock, flags);
|
|
if (sclp_init_req.status == SCLP_REQ_DONE &&
|
|
sccb->header.response_code == 0x20) {
|
|
/* Successful request */
|
|
if (calculate) {
|
|
sclp_receive_mask = sccb_get_sclp_recv_mask(sccb);
|
|
sclp_send_mask = sccb_get_sclp_send_mask(sccb);
|
|
} else {
|
|
sclp_receive_mask = 0;
|
|
sclp_send_mask = 0;
|
|
}
|
|
spin_unlock_irqrestore(&sclp_lock, flags);
|
|
sclp_dispatch_state_change();
|
|
spin_lock_irqsave(&sclp_lock, flags);
|
|
rc = 0;
|
|
break;
|
|
}
|
|
}
|
|
sclp_mask_state = sclp_mask_state_idle;
|
|
spin_unlock_irqrestore(&sclp_lock, flags);
|
|
return rc;
|
|
}
|
|
|
|
/* Deactivate SCLP interface. On success, new requests will be rejected,
|
|
* events will no longer be dispatched. Return 0 on success, non-zero
|
|
* otherwise. */
|
|
int
|
|
sclp_deactivate(void)
|
|
{
|
|
unsigned long flags;
|
|
int rc;
|
|
|
|
spin_lock_irqsave(&sclp_lock, flags);
|
|
/* Deactivate can only be called when active */
|
|
if (sclp_activation_state != sclp_activation_state_active) {
|
|
spin_unlock_irqrestore(&sclp_lock, flags);
|
|
return -EINVAL;
|
|
}
|
|
sclp_activation_state = sclp_activation_state_deactivating;
|
|
spin_unlock_irqrestore(&sclp_lock, flags);
|
|
rc = sclp_init_mask(0);
|
|
spin_lock_irqsave(&sclp_lock, flags);
|
|
if (rc == 0)
|
|
sclp_activation_state = sclp_activation_state_inactive;
|
|
else
|
|
sclp_activation_state = sclp_activation_state_active;
|
|
spin_unlock_irqrestore(&sclp_lock, flags);
|
|
return rc;
|
|
}
|
|
|
|
EXPORT_SYMBOL(sclp_deactivate);
|
|
|
|
/* Reactivate SCLP interface after sclp_deactivate. On success, new
|
|
* requests will be accepted, events will be dispatched again. Return 0 on
|
|
* success, non-zero otherwise. */
|
|
int
|
|
sclp_reactivate(void)
|
|
{
|
|
unsigned long flags;
|
|
int rc;
|
|
|
|
spin_lock_irqsave(&sclp_lock, flags);
|
|
/* Reactivate can only be called when inactive */
|
|
if (sclp_activation_state != sclp_activation_state_inactive) {
|
|
spin_unlock_irqrestore(&sclp_lock, flags);
|
|
return -EINVAL;
|
|
}
|
|
sclp_activation_state = sclp_activation_state_activating;
|
|
spin_unlock_irqrestore(&sclp_lock, flags);
|
|
rc = sclp_init_mask(1);
|
|
spin_lock_irqsave(&sclp_lock, flags);
|
|
if (rc == 0)
|
|
sclp_activation_state = sclp_activation_state_active;
|
|
else
|
|
sclp_activation_state = sclp_activation_state_inactive;
|
|
spin_unlock_irqrestore(&sclp_lock, flags);
|
|
return rc;
|
|
}
|
|
|
|
EXPORT_SYMBOL(sclp_reactivate);
|
|
|
|
/* Handler for external interruption used during initialization. Modify
|
|
* request state to done. */
|
|
static void sclp_check_handler(struct ext_code ext_code,
|
|
unsigned int param32, unsigned long param64)
|
|
{
|
|
u32 finished_sccb;
|
|
|
|
inc_irq_stat(IRQEXT_SCP);
|
|
finished_sccb = param32 & 0xfffffff8;
|
|
/* Is this the interrupt we are waiting for? */
|
|
if (finished_sccb == 0)
|
|
return;
|
|
if (finished_sccb != __pa(sclp_init_sccb))
|
|
panic("sclp: unsolicited interrupt for buffer at 0x%x\n",
|
|
finished_sccb);
|
|
spin_lock(&sclp_lock);
|
|
if (sclp_running_state == sclp_running_state_running) {
|
|
sclp_init_req.status = SCLP_REQ_DONE;
|
|
sclp_running_state = sclp_running_state_idle;
|
|
}
|
|
spin_unlock(&sclp_lock);
|
|
}
|
|
|
|
/* Initial init mask request timed out. Modify request state to failed. */
|
|
static void
|
|
sclp_check_timeout(struct timer_list *unused)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&sclp_lock, flags);
|
|
if (sclp_running_state == sclp_running_state_running) {
|
|
sclp_init_req.status = SCLP_REQ_FAILED;
|
|
sclp_running_state = sclp_running_state_idle;
|
|
}
|
|
spin_unlock_irqrestore(&sclp_lock, flags);
|
|
}
|
|
|
|
/* Perform a check of the SCLP interface. Return zero if the interface is
|
|
* available and there are no pending requests from a previous instance.
|
|
* Return non-zero otherwise. */
|
|
static int
|
|
sclp_check_interface(void)
|
|
{
|
|
struct init_sccb *sccb;
|
|
unsigned long flags;
|
|
int retry;
|
|
int rc;
|
|
|
|
spin_lock_irqsave(&sclp_lock, flags);
|
|
/* Prepare init mask command */
|
|
rc = register_external_irq(EXT_IRQ_SERVICE_SIG, sclp_check_handler);
|
|
if (rc) {
|
|
spin_unlock_irqrestore(&sclp_lock, flags);
|
|
return rc;
|
|
}
|
|
for (retry = 0; retry <= SCLP_INIT_RETRY; retry++) {
|
|
__sclp_make_init_req(0, 0);
|
|
sccb = (struct init_sccb *) sclp_init_req.sccb;
|
|
rc = sclp_service_call_trace(sclp_init_req.command, sccb);
|
|
if (rc == -EIO)
|
|
break;
|
|
sclp_init_req.status = SCLP_REQ_RUNNING;
|
|
sclp_running_state = sclp_running_state_running;
|
|
__sclp_set_request_timer(SCLP_RETRY_INTERVAL * HZ,
|
|
sclp_check_timeout);
|
|
spin_unlock_irqrestore(&sclp_lock, flags);
|
|
/* Enable service-signal interruption - needs to happen
|
|
* with IRQs enabled. */
|
|
irq_subclass_register(IRQ_SUBCLASS_SERVICE_SIGNAL);
|
|
/* Wait for signal from interrupt or timeout */
|
|
sclp_sync_wait();
|
|
/* Disable service-signal interruption - needs to happen
|
|
* with IRQs enabled. */
|
|
irq_subclass_unregister(IRQ_SUBCLASS_SERVICE_SIGNAL);
|
|
spin_lock_irqsave(&sclp_lock, flags);
|
|
del_timer(&sclp_request_timer);
|
|
rc = -EBUSY;
|
|
if (sclp_init_req.status == SCLP_REQ_DONE) {
|
|
if (sccb->header.response_code == 0x20) {
|
|
rc = 0;
|
|
break;
|
|
} else if (sccb->header.response_code == 0x74f0) {
|
|
if (!sclp_mask_compat_mode) {
|
|
sclp_mask_compat_mode = true;
|
|
retry = 0;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
unregister_external_irq(EXT_IRQ_SERVICE_SIG, sclp_check_handler);
|
|
spin_unlock_irqrestore(&sclp_lock, flags);
|
|
return rc;
|
|
}
|
|
|
|
/* Reboot event handler. Reset send and receive mask to prevent pending SCLP
|
|
* events from interfering with rebooted system. */
|
|
static int
|
|
sclp_reboot_event(struct notifier_block *this, unsigned long event, void *ptr)
|
|
{
|
|
sclp_deactivate();
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block sclp_reboot_notifier = {
|
|
.notifier_call = sclp_reboot_event
|
|
};
|
|
|
|
static ssize_t con_pages_show(struct device_driver *dev, char *buf)
|
|
{
|
|
return sprintf(buf, "%i\n", sclp_console_pages);
|
|
}
|
|
|
|
static DRIVER_ATTR_RO(con_pages);
|
|
|
|
static ssize_t con_drop_show(struct device_driver *dev, char *buf)
|
|
{
|
|
return sprintf(buf, "%i\n", sclp_console_drop);
|
|
}
|
|
|
|
static DRIVER_ATTR_RO(con_drop);
|
|
|
|
static ssize_t con_full_show(struct device_driver *dev, char *buf)
|
|
{
|
|
return sprintf(buf, "%lu\n", sclp_console_full);
|
|
}
|
|
|
|
static DRIVER_ATTR_RO(con_full);
|
|
|
|
static struct attribute *sclp_drv_attrs[] = {
|
|
&driver_attr_con_pages.attr,
|
|
&driver_attr_con_drop.attr,
|
|
&driver_attr_con_full.attr,
|
|
NULL,
|
|
};
|
|
static struct attribute_group sclp_drv_attr_group = {
|
|
.attrs = sclp_drv_attrs,
|
|
};
|
|
static const struct attribute_group *sclp_drv_attr_groups[] = {
|
|
&sclp_drv_attr_group,
|
|
NULL,
|
|
};
|
|
|
|
static struct platform_driver sclp_pdrv = {
|
|
.driver = {
|
|
.name = "sclp",
|
|
.groups = sclp_drv_attr_groups,
|
|
},
|
|
};
|
|
|
|
/* Initialize SCLP driver. Return zero if driver is operational, non-zero
|
|
* otherwise. */
|
|
static int
|
|
sclp_init(void)
|
|
{
|
|
unsigned long flags;
|
|
int rc = 0;
|
|
|
|
spin_lock_irqsave(&sclp_lock, flags);
|
|
/* Check for previous or running initialization */
|
|
if (sclp_init_state != sclp_init_state_uninitialized)
|
|
goto fail_unlock;
|
|
sclp_init_state = sclp_init_state_initializing;
|
|
sclp_read_sccb = (void *) __get_free_page(GFP_ATOMIC | GFP_DMA);
|
|
sclp_init_sccb = (void *) __get_free_page(GFP_ATOMIC | GFP_DMA);
|
|
BUG_ON(!sclp_read_sccb || !sclp_init_sccb);
|
|
/* Set up variables */
|
|
list_add(&sclp_state_change_event.list, &sclp_reg_list);
|
|
timer_setup(&sclp_request_timer, NULL, 0);
|
|
timer_setup(&sclp_queue_timer, sclp_req_queue_timeout, 0);
|
|
/* Check interface */
|
|
spin_unlock_irqrestore(&sclp_lock, flags);
|
|
rc = sclp_check_interface();
|
|
spin_lock_irqsave(&sclp_lock, flags);
|
|
if (rc)
|
|
goto fail_init_state_uninitialized;
|
|
/* Register reboot handler */
|
|
rc = register_reboot_notifier(&sclp_reboot_notifier);
|
|
if (rc)
|
|
goto fail_init_state_uninitialized;
|
|
/* Register interrupt handler */
|
|
rc = register_external_irq(EXT_IRQ_SERVICE_SIG, sclp_interrupt_handler);
|
|
if (rc)
|
|
goto fail_unregister_reboot_notifier;
|
|
sclp_init_state = sclp_init_state_initialized;
|
|
spin_unlock_irqrestore(&sclp_lock, flags);
|
|
/* Enable service-signal external interruption - needs to happen with
|
|
* IRQs enabled. */
|
|
irq_subclass_register(IRQ_SUBCLASS_SERVICE_SIGNAL);
|
|
sclp_init_mask(1);
|
|
return 0;
|
|
|
|
fail_unregister_reboot_notifier:
|
|
unregister_reboot_notifier(&sclp_reboot_notifier);
|
|
fail_init_state_uninitialized:
|
|
sclp_init_state = sclp_init_state_uninitialized;
|
|
free_page((unsigned long) sclp_read_sccb);
|
|
free_page((unsigned long) sclp_init_sccb);
|
|
fail_unlock:
|
|
spin_unlock_irqrestore(&sclp_lock, flags);
|
|
return rc;
|
|
}
|
|
|
|
static __init int sclp_initcall(void)
|
|
{
|
|
int rc;
|
|
|
|
rc = platform_driver_register(&sclp_pdrv);
|
|
if (rc)
|
|
return rc;
|
|
|
|
return sclp_init();
|
|
}
|
|
|
|
arch_initcall(sclp_initcall);
|