[S390] cio: obtain mdc value per channel path
Add support to accumulate the number of 64K-bytes blocks all paths to a device at least support for a transport command. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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@ -204,6 +204,8 @@ int ccw_device_tm_start_timeout(struct ccw_device *, struct tcw *,
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unsigned long, u8, int);
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int ccw_device_tm_intrg(struct ccw_device *cdev);
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int ccw_device_get_mdc(struct ccw_device *cdev, u8 mask);
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extern int ccw_device_set_online(struct ccw_device *cdev);
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extern int ccw_device_set_offline(struct ccw_device *cdev);
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@ -695,6 +695,25 @@ out:
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return ret;
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}
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int chsc_determine_fmt1_channel_path_desc(struct chp_id chpid,
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struct channel_path_desc_fmt1 *desc)
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{
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struct chsc_response_struct *chsc_resp;
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struct chsc_scpd *scpd_area;
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int ret;
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spin_lock_irq(&chsc_page_lock);
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scpd_area = chsc_page;
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ret = chsc_determine_channel_path_desc(chpid, 0, 0, 1, 0, scpd_area);
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if (ret)
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goto out;
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chsc_resp = (void *)&scpd_area->response;
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memcpy(desc, &chsc_resp->data, sizeof(*desc));
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out:
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spin_unlock_irq(&chsc_page_lock);
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return ret;
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}
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static void
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chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv,
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struct cmg_chars *chars)
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@ -35,6 +35,22 @@ struct channel_path_desc {
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u8 chpp;
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} __attribute__ ((packed));
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struct channel_path_desc_fmt1 {
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u8 flags;
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u8 lsn;
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u8 desc;
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u8 chpid;
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u32:24;
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u8 chpp;
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u32 unused[3];
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u16 mdc;
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u16:13;
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u8 r:1;
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u8 s:1;
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u8 f:1;
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u32 zeros[2];
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} __attribute__ ((packed));
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struct channel_path;
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struct css_chsc_char {
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@ -92,6 +108,8 @@ int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt,
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int c, int m, void *page);
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int chsc_determine_base_channel_path_desc(struct chp_id chpid,
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struct channel_path_desc *desc);
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int chsc_determine_fmt1_channel_path_desc(struct chp_id chpid,
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struct channel_path_desc_fmt1 *desc);
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void chsc_chp_online(struct chp_id chpid);
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void chsc_chp_offline(struct chp_id chpid);
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int chsc_get_channel_measurement_chars(struct channel_path *chp);
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@ -686,6 +686,46 @@ int ccw_device_tm_start_timeout(struct ccw_device *cdev, struct tcw *tcw,
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}
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EXPORT_SYMBOL(ccw_device_tm_start_timeout);
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/**
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* ccw_device_get_mdc - accumulate max data count
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* @cdev: ccw device for which the max data count is accumulated
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* @mask: mask of paths to use
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*
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* Return the number of 64K-bytes blocks all paths at least support
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* for a transport command. Return values <= 0 indicate failures.
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*/
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int ccw_device_get_mdc(struct ccw_device *cdev, u8 mask)
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{
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struct subchannel *sch = to_subchannel(cdev->dev.parent);
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struct channel_path_desc_fmt1 desc;
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struct chp_id chpid;
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int mdc = 0, ret, i;
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/* Adjust requested path mask to excluded varied off paths. */
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if (mask)
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mask &= sch->lpm;
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else
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mask = sch->lpm;
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chp_id_init(&chpid);
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for (i = 0; i < 8; i++) {
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if (!(mask & (0x80 >> i)))
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continue;
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chpid.id = sch->schib.pmcw.chpid[i];
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ret = chsc_determine_fmt1_channel_path_desc(chpid, &desc);
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if (ret)
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return ret;
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if (!desc.f)
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return 0;
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if (!desc.r)
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mdc = 1;
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mdc = mdc ? min(mdc, (int)desc.mdc) : desc.mdc;
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}
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return mdc;
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}
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EXPORT_SYMBOL(ccw_device_get_mdc);
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/**
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* ccw_device_tm_intrg - perform interrogate function
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* @cdev: ccw device on which to perform the interrogate function
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