1 files changed, 86 insertions, 30 deletions

diff --git a/drivers/s390/cio/chp.c b/drivers/s390/cio/chp.c
index 297cdceb0ca4..db00b0591733 100644
--- a/drivers/s390/cio/chp.c
+++ b/drivers/s390/cio/chp.c
@@ -18,6 +18,7 @@
 #include <asm/chpid.h>
 #include <asm/sclp.h>
 
+#include "../s390mach.h"
 #include "cio.h"
 #include "css.h"
 #include "ioasm.h"
@@ -94,6 +95,7 @@ u8 chp_get_sch_opm(struct subchannel *sch)
         }
         return opm;
 }
+EXPORT_SYMBOL_GPL(chp_get_sch_opm);
 
 /**
  * chp_is_registered - check if a channel-path is registered
@@ -121,11 +123,8 @@ static int s390_vary_chpid(struct chp_id chpid, int on)
         CIO_TRACE_EVENT(2, dbf_text);
 
         status = chp_get_status(chpid);
-        if (!on && !status) {
-                printk(KERN_ERR "cio: chpid %x.%02x is already offline\n",
-                       chpid.cssid, chpid.id);
-                return -EINVAL;
-        }
+        if (!on && !status)
+                return 0;
 
         set_chp_logically_online(chpid, on);
         chsc_chp_vary(chpid, on);
@@ -141,21 +140,14 @@ static ssize_t chp_measurement_chars_read(struct kobject *kobj,
 {
         struct channel_path *chp;
         struct device *device;
-        unsigned int size;
 
         device = container_of(kobj, struct device, kobj);
         chp = to_channelpath(device);
         if (!chp->cmg_chars)
                 return 0;
 
-        size = sizeof(struct cmg_chars);
-
-        if (off > size)
-                return 0;
-        if (off + count > size)
-                count = size - off;
-        memcpy(buf, chp->cmg_chars + off, count);
-        return count;
+        return memory_read_from_buffer(buf, count, &off,
+                                chp->cmg_chars, sizeof(struct cmg_chars));
 }
 
 static struct bin_attribute chp_measurement_chars_attr = {
@@ -405,7 +397,7 @@ int chp_new(struct chp_id chpid)
                  chpid.id);
 
         /* Obtain channel path description and fill it in. */
-        ret = chsc_determine_channel_path_description(chpid, &chp->desc);
+        ret = chsc_determine_base_channel_path_desc(chpid, &chp->desc);
         if (ret)
                 goto out_free;
         if ((chp->desc.flags & 0x80) == 0) {
@@ -413,8 +405,7 @@ int chp_new(struct chp_id chpid)
                 goto out_free;
         }
         /* Get channel-measurement characteristics. */
-        if (css_characteristics_avail && css_chsc_characteristics.scmc
-            && css_chsc_characteristics.secm) {
+        if (css_chsc_characteristics.scmc && css_chsc_characteristics.secm) {
                 ret = chsc_get_channel_measurement_chars(chp);
                 if (ret)
                         goto out_free;
@@ -476,26 +467,74 @@ void *chp_get_chp_desc(struct chp_id chpid)
 
 /**
  * chp_process_crw - process channel-path status change
- * @id: channel-path ID number
- * @status: non-zero if channel-path has become available, zero otherwise
+ * @crw0: channel report-word to handler
+ * @crw1: second channel-report word (always NULL)
+ * @overflow: crw overflow indication
  *
  * Handle channel-report-words indicating that the status of a channel-path
  * has changed.
  */
-void chp_process_crw(int id, int status)
+static void chp_process_crw(struct crw *crw0, struct crw *crw1,
+                            int overflow)
 {
         struct chp_id chpid;
 
+        if (overflow) {
+                css_schedule_eval_all();
+                return;
+        }
+        CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, "
+                      "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
+                      crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc,
+                      crw0->erc, crw0->rsid);
+        /*
+         * Check for solicited machine checks. These are
+         * created by reset channel path and need not be
+         * handled here.
+         */
+        if (crw0->slct) {
+                CIO_CRW_EVENT(2, "solicited machine check for "
+                              "channel path %02X\n", crw0->rsid);
+                return;
+        }
         chp_id_init(&chpid);
-        chpid.id = id;
-        if (status) {
+        chpid.id = crw0->rsid;
+        switch (crw0->erc) {
+        case CRW_ERC_IPARM: /* Path has come. */
                 if (!chp_is_registered(chpid))
                         chp_new(chpid);
                 chsc_chp_online(chpid);
-        } else
+                break;
+        case CRW_ERC_PERRI: /* Path has gone. */
+        case CRW_ERC_PERRN:
                 chsc_chp_offline(chpid);
+                break;
+        default:
+                CIO_CRW_EVENT(2, "Don't know how to handle erc=%x\n",
+                              crw0->erc);
+        }
 }
 
+int chp_ssd_get_mask(struct chsc_ssd_info *ssd, struct chp_link *link)
+{
+        int i;
+        int mask;
+
+        for (i = 0; i < 8; i++) {
+                mask = 0x80 >> i;
+                if (!(ssd->path_mask & mask))
+                        continue;
+                if (!chp_id_is_equal(&ssd->chpid[i], &link->chpid))
+                        continue;
+                if ((ssd->fla_valid_mask & mask) &&
+                    ((ssd->fla[i] & link->fla_mask) != link->fla))
+                        continue;
+                return mask;
+        }
+        return 0;
+}
+EXPORT_SYMBOL_GPL(chp_ssd_get_mask);
+
 static inline int info_bit_num(struct chp_id id)
 {
         return id.id + id.cssid * (__MAX_CHPID + 1);
@@ -575,6 +614,7 @@ static void cfg_func(struct work_struct *work)
 {
         struct chp_id chpid;
         enum cfg_task_t t;
+        int rc;
 
         mutex_lock(&cfg_lock);
         t = cfg_none;
@@ -589,14 +629,24 @@ static void cfg_func(struct work_struct *work)
 
         switch (t) {
         case cfg_configure:
-                sclp_chp_configure(chpid);
-                info_expire();
-                chsc_chp_online(chpid);
+                rc = sclp_chp_configure(chpid);
+                if (rc)
+                        CIO_MSG_EVENT(2, "chp: sclp_chp_configure(%x.%02x)="
+                                      "%d\n", chpid.cssid, chpid.id, rc);
+                else {
+                        info_expire();
+                        chsc_chp_online(chpid);
+                }
                 break;
         case cfg_deconfigure:
-                sclp_chp_deconfigure(chpid);
-                info_expire();
-                chsc_chp_offline(chpid);
+                rc = sclp_chp_deconfigure(chpid);
+                if (rc)
+                        CIO_MSG_EVENT(2, "chp: sclp_chp_deconfigure(%x.%02x)="
+                                      "%d\n", chpid.cssid, chpid.id, rc);
+                else {
+                        info_expire();
+                        chsc_chp_offline(chpid);
+                }
                 break;
         case cfg_none:
                 /* Get updated information after last change. */
@@ -654,10 +704,16 @@ static int cfg_wait_idle(void)
 static int __init chp_init(void)
 {
         struct chp_id chpid;
+        int ret;
 
+        ret = s390_register_crw_handler(CRW_RSC_CPATH, chp_process_crw);
+        if (ret)
+                return ret;
         chp_wq = create_singlethread_workqueue("cio_chp");
-        if (!chp_wq)
+        if (!chp_wq) {
+                s390_unregister_crw_handler(CRW_RSC_CPATH);
                 return -ENOMEM;
+        }
         INIT_WORK(&cfg_work, cfg_func);
         init_waitqueue_head(&cfg_wait_queue);
         if (info_update())