3 files changed, 77 insertions, 0 deletions

diff --git a/drivers/s390/cio/chsc.c b/drivers/s390/cio/chsc.c
index 1aaddea673e0..0689fcf23a11 100644
--- a/drivers/s390/cio/chsc.c
+++ b/drivers/s390/cio/chsc.c
@@ -695,6 +695,25 @@ out:
         return ret;
 }
 
+int chsc_determine_fmt1_channel_path_desc(struct chp_id chpid,
+                                          struct channel_path_desc_fmt1 *desc)
+{
+        struct chsc_response_struct *chsc_resp;
+        struct chsc_scpd *scpd_area;
+        int ret;
+
+        spin_lock_irq(&chsc_page_lock);
+        scpd_area = chsc_page;
+        ret = chsc_determine_channel_path_desc(chpid, 0, 0, 1, 0, scpd_area);
+        if (ret)
+                goto out;
+        chsc_resp = (void *)&scpd_area->response;
+        memcpy(desc, &chsc_resp->data, sizeof(*desc));
+out:
+        spin_unlock_irq(&chsc_page_lock);
+        return ret;
+}
+
 static void
 chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv,
                           struct cmg_chars *chars)
diff --git a/drivers/s390/cio/chsc.h b/drivers/s390/cio/chsc.h
index 6693f5e3176f..3f15b2aaeaea 100644
--- a/drivers/s390/cio/chsc.h
+++ b/drivers/s390/cio/chsc.h
@@ -35,6 +35,22 @@ struct channel_path_desc {
         u8 chpp;
 } __attribute__ ((packed));
 
+struct channel_path_desc_fmt1 {
+        u8 flags;
+        u8 lsn;
+        u8 desc;
+        u8 chpid;
+        u32:24;
+        u8 chpp;
+        u32 unused[3];
+        u16 mdc;
+        u16:13;
+        u8 r:1;
+        u8 s:1;
+        u8 f:1;
+        u32 zeros[2];
+} __attribute__ ((packed));
+
 struct channel_path;
 
 struct css_chsc_char {
@@ -92,6 +108,8 @@ int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt,
                                      int c, int m, void *page);
 int chsc_determine_base_channel_path_desc(struct chp_id chpid,
                                           struct channel_path_desc *desc);
+int chsc_determine_fmt1_channel_path_desc(struct chp_id chpid,
+                                          struct channel_path_desc_fmt1 *desc);
 void chsc_chp_online(struct chp_id chpid);
 void chsc_chp_offline(struct chp_id chpid);
 int chsc_get_channel_measurement_chars(struct channel_path *chp);
diff --git a/drivers/s390/cio/device_ops.c b/drivers/s390/cio/device_ops.c
index 6da84543dfe9..651976b54af8 100644
--- a/drivers/s390/cio/device_ops.c
+++ b/drivers/s390/cio/device_ops.c
@@ -687,6 +687,46 @@ int ccw_device_tm_start_timeout(struct ccw_device *cdev, struct tcw *tcw,
 EXPORT_SYMBOL(ccw_device_tm_start_timeout);
 
 /**
+ * ccw_device_get_mdc - accumulate max data count
+ * @cdev: ccw device for which the max data count is accumulated
+ * @mask: mask of paths to use
+ *
+ * Return the number of 64K-bytes blocks all paths at least support
+ * for a transport command. Return values <= 0 indicate failures.
+ */
+int ccw_device_get_mdc(struct ccw_device *cdev, u8 mask)
+{
+        struct subchannel *sch = to_subchannel(cdev->dev.parent);
+        struct channel_path_desc_fmt1 desc;
+        struct chp_id chpid;
+        int mdc = 0, ret, i;
+
+        /* Adjust requested path mask to excluded varied off paths. */
+        if (mask)
+                mask &= sch->lpm;
+        else
+                mask = sch->lpm;
+
+        chp_id_init(&chpid);
+        for (i = 0; i < 8; i++) {
+                if (!(mask & (0x80 >> i)))
+                        continue;
+                chpid.id = sch->schib.pmcw.chpid[i];
+                ret = chsc_determine_fmt1_channel_path_desc(chpid, &desc);
+                if (ret)
+                        return ret;
+                if (!desc.f)
+                        return 0;
+                if (!desc.r)
+                        mdc = 1;
+                mdc = mdc ? min(mdc, (int)desc.mdc) : desc.mdc;
+        }
+
+        return mdc;
+}
+EXPORT_SYMBOL(ccw_device_get_mdc);
+
+/**
  * ccw_device_tm_intrg - perform interrogate function
  * @cdev: ccw device on which to perform the interrogate function
  *