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author | Sebastian Ott <sebott@linux.vnet.ibm.com> | 2011-01-05 12:47:56 +0100 |
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committer | Martin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com> | 2011-01-05 12:47:28 +0100 |
commit | ce322ccd53f2505cf8b0ed204631d6ac054ac66a (patch) | |
tree | c3b9b9145d691b3c8a389be9299b96b574b8f69e /drivers | |
parent | 37e8952174c6c239d1c86125e032fd6ad107a3e6 (diff) | |
download | blackbird-op-linux-ce322ccd53f2505cf8b0ed204631d6ac054ac66a.tar.gz blackbird-op-linux-ce322ccd53f2505cf8b0ed204631d6ac054ac66a.zip |
[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>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/s390/cio/chsc.c | 19 | ||||
-rw-r--r-- | drivers/s390/cio/chsc.h | 18 | ||||
-rw-r--r-- | drivers/s390/cio/device_ops.c | 40 |
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 * |