[patch 05/38] cio: Introduce separate files for channel-path related code.

Martin Schwidefsky
2007-04-27T14:15:53Z

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[-- Type: text/plain, Size: 35005 bytes --]

From: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>

Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
---

drivers/s390/cio/Makefile | 2
drivers/s390/cio/chp.c | 433 ++++++++++++++++++++++++++++++++++++++
drivers/s390/cio/chp.h | 37 +++
drivers/s390/cio/chsc.c | 473 +++---------------------------------------
drivers/s390/cio/chsc.h | 30 --
drivers/s390/cio/cio.c | 8
drivers/s390/cio/css.h | 1
drivers/s390/cio/device_fsm.c | 6
drivers/s390/cio/device_ops.c | 7
drivers/s390/s390mach.c | 1
10 files changed, 535 insertions(+), 463 deletions(-)

Index: quilt-2.6/drivers/s390/cio/chp.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ quilt-2.6/drivers/s390/cio/chp.c 2007-04-27 16:04:53.000000000 +0200
@@ -0,0 +1,433 @@
+/*
+ * drivers/s390/cio/chp.c
+ *
+ * Copyright IBM Corp. 1999,2007
+ * Author(s): Cornelia Huck (cornelia.huck@de.ibm.com)
+ * Arnd Bergmann (arndb@de.ibm.com)
+ * Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
+ */
+
+#include <linux/bug.h>
+#include <linux/workqueue.h>
+#include <linux/spinlock.h>
+#include <asm/errno.h>
+
+#include "chpid.h"
+#include "cio.h"
+#include "css.h"
+#include "ioasm.h"
+#include "cio_debug.h"
+#include "chp.h"
+
+#define to_channelpath(device) container_of(device, struct channel_path, dev)
+
+/* Return channel_path struct for given chpid. */
+static inline struct channel_path *chpid_to_chp(struct chp_id chpid)
+{
+ return css[chpid.cssid]->chps[chpid.id];
+}
+
+/* Set vary state for given chpid. */
+static void set_chp_logically_online(struct chp_id chpid, int onoff)
+{
+ chpid_to_chp(chpid)->state = onoff;
+}
+
+/* On succes return 0 if channel-path is varied offline, 1 if it is varied
+ * online. Return -ENODEV if channel-path is not registered. */
+int chp_get_status(struct chp_id chpid)
+{
+ return (chpid_to_chp(chpid) ? chpid_to_chp(chpid)->state : -ENODEV);
+}
+
+/**
+ * chp_get_sch_opm - return opm for subchannel
+ * @sch: subchannel
+ *
+ * Calculate and return the operational path mask (opm) based on the chpids
+ * used by the subchannel and the status of the associated channel-paths.
+ */
+u8 chp_get_sch_opm(struct subchannel *sch)
+{
+ struct chp_id chpid;
+ int opm;
+ int i;
+
+ opm = 0;
+ chp_id_init(&chpid);
+ for (i=0; i < 8; i++) {
+ opm <<= 1;
+ chpid.id = sch->schib.pmcw.chpid[i];
+ if (chp_get_status(chpid) != 0)
+ opm |= 1;
+ }
+ return opm;
+}
+
+/**
+ * chp_is_registered - check if a channel-path is registered
+ * @chpid: channel-path ID
+ *
+ * Return non-zero if a channel-path with the given chpid is registered,
+ * zero otherwise.
+ */
+int chp_is_registered(struct chp_id chpid)
+{
+ return chpid_to_chp(chpid) != NULL;
+}
+
+/*
+ * Function: s390_vary_chpid
+ * Varies the specified chpid online or offline
+ */
+static int s390_vary_chpid(struct chp_id chpid, int on)
+{
+ char dbf_text[15];
+ int status;
+
+ sprintf(dbf_text, on?"varyon%x.%02x":"varyoff%x.%02x", chpid.cssid,
+ chpid.id);
+ CIO_TRACE_EVENT( 2, dbf_text);
+
+ status = chp_get_status(chpid);
+ if (status < 0) {
+ printk(KERN_ERR "Can't vary unknown chpid %x.%02x\n",
+ chpid.cssid, chpid.id);
+ return -EINVAL;
+ }
+
+ if (!on && !status) {
+ printk(KERN_ERR "chpid %x.%02x is already offline\n",
+ chpid.cssid, chpid.id);
+ return -EINVAL;
+ }
+
+ set_chp_logically_online(chpid, on);
+ chsc_chp_vary(chpid, on);
+ return 0;
+}
+
+/*
+ * Channel measurement related functions
+ */
+static ssize_t chp_measurement_chars_read(struct kobject *kobj, char *buf,
+ loff_t off, size_t count)
+{
+ struct channel_path *chp;
+ unsigned int size;
+
+ chp = to_channelpath(container_of(kobj, struct device, kobj));
+ 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;
+}
+
+static struct bin_attribute chp_measurement_chars_attr = {
+ .attr = {
+ .name = "measurement_chars",
+ .mode = S_IRUSR,
+ .owner = THIS_MODULE,
+ },
+ .size = sizeof(struct cmg_chars),
+ .read = chp_measurement_chars_read,
+};
+
+static void chp_measurement_copy_block(struct cmg_entry *buf,
+ struct channel_subsystem *css,
+ struct chp_id chpid)
+{
+ void *area;
+ struct cmg_entry *entry, reference_buf;
+ int idx;
+
+ if (chpid.id < 128) {
+ area = css->cub_addr1;
+ idx = chpid.id;
+ } else {
+ area = css->cub_addr2;
+ idx = chpid.id - 128;
+ }
+ entry = area + (idx * sizeof(struct cmg_entry));
+ do {
+ memcpy(buf, entry, sizeof(*entry));
+ memcpy(&reference_buf, entry, sizeof(*entry));
+ } while (reference_buf.values[0] != buf->values[0]);
+}
+
+static ssize_t chp_measurement_read(struct kobject *kobj, char *buf,
+ loff_t off, size_t count)
+{
+ struct channel_path *chp;
+ struct channel_subsystem *css;
+ unsigned int size;
+
+ chp = to_channelpath(container_of(kobj, struct device, kobj));
+ css = to_css(chp->dev.parent);
+
+ size = sizeof(struct cmg_entry);
+
+ /* Only allow single reads. */
+ if (off || count < size)
+ return 0;
+ chp_measurement_copy_block((struct cmg_entry *)buf, css, chp->chpid);
+ count = size;
+ return count;
+}
+
+static struct bin_attribute chp_measurement_attr = {
+ .attr = {
+ .name = "measurement",
+ .mode = S_IRUSR,
+ .owner = THIS_MODULE,
+ },
+ .size = sizeof(struct cmg_entry),
+ .read = chp_measurement_read,
+};
+
+void chp_remove_cmg_attr(struct channel_path *chp)
+{
+ device_remove_bin_file(&chp->dev, &chp_measurement_chars_attr);
+ device_remove_bin_file(&chp->dev, &chp_measurement_attr);
+}
+
+int chp_add_cmg_attr(struct channel_path *chp)
+{
+ int ret;
+
+ ret = device_create_bin_file(&chp->dev, &chp_measurement_chars_attr);
+ if (ret)
+ return ret;
+ ret = device_create_bin_file(&chp->dev, &chp_measurement_attr);
+ if (ret)
+ device_remove_bin_file(&chp->dev, &chp_measurement_chars_attr);
+ return ret;
+}
+
+/*
+ * Files for the channel path entries.
+ */
+static ssize_t chp_status_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct channel_path *chp = container_of(dev, struct channel_path, dev);
+
+ if (!chp)
+ return 0;
+ return (chp_get_status(chp->chpid) ? sprintf(buf, "online\n") :
+ sprintf(buf, "offline\n"));
+}
+
+static ssize_t chp_status_write(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct channel_path *cp = container_of(dev, struct channel_path, dev);
+ char cmd[10];
+ int num_args;
+ int error;
+
+ num_args = sscanf(buf, "%5s", cmd);
+ if (!num_args)
+ return count;
+
+ if (!strnicmp(cmd, "on", 2) || !strcmp(cmd, "1"))
+ error = s390_vary_chpid(cp->chpid, 1);
+ else if (!strnicmp(cmd, "off", 3) || !strcmp(cmd, "0"))
+ error = s390_vary_chpid(cp->chpid, 0);
+ else
+ error = -EINVAL;
+
+ return error < 0 ? error : count;
+
+}
+
+static DEVICE_ATTR(status, 0644, chp_status_show, chp_status_write);
+
+static ssize_t chp_type_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct channel_path *chp = container_of(dev, struct channel_path, dev);
+
+ if (!chp)
+ return 0;
+ return sprintf(buf, "%x\n", chp->desc.desc);
+}
+
+static DEVICE_ATTR(type, 0444, chp_type_show, NULL);
+
+static ssize_t chp_cmg_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct channel_path *chp = to_channelpath(dev);
+
+ if (!chp)
+ return 0;
+ if (chp->cmg == -1) /* channel measurements not available */
+ return sprintf(buf, "unknown\n");
+ return sprintf(buf, "%x\n", chp->cmg);
+}
+
+static DEVICE_ATTR(cmg, 0444, chp_cmg_show, NULL);
+
+static ssize_t chp_shared_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct channel_path *chp = to_channelpath(dev);
+
+ if (!chp)
+ return 0;
+ if (chp->shared == -1) /* channel measurements not available */
+ return sprintf(buf, "unknown\n");
+ return sprintf(buf, "%x\n", chp->shared);
+}
+
+static DEVICE_ATTR(shared, 0444, chp_shared_show, NULL);
+
+static struct attribute * chp_attrs[] = {
+ &dev_attr_status.attr,
+ &dev_attr_type.attr,
+ &dev_attr_cmg.attr,
+ &dev_attr_shared.attr,
+ NULL,
+};
+
+static struct attribute_group chp_attr_group = {
+ .attrs = chp_attrs,
+};
+
+static void chp_release(struct device *dev)
+{
+ struct channel_path *cp;
+
+ cp = container_of(dev, struct channel_path, dev);
+ kfree(cp);
+}
+
+/**
+ * chp_new - register a new channel-path
+ * @chpid - channel-path ID
+ *
+ * Create and register data structure representing new channel-path. Return
+ * zero on success, non-zero otherwise.
+ */
+int chp_new(struct chp_id chpid)
+{
+ struct channel_path *chp;
+ int ret;
+
+ chp = kzalloc(sizeof(struct channel_path), GFP_KERNEL);
+ if (!chp)
+ return -ENOMEM;
+
+ /* fill in status, etc. */
+ chp->chpid = chpid;
+ chp->state = 1;
+ chp->dev.parent = &css[chpid.cssid]->device;
+ chp->dev.release = chp_release;
+ snprintf(chp->dev.bus_id, BUS_ID_SIZE, "chp%x.%02x", chpid.cssid,
+ chpid.id);
+
+ /* Obtain channel path description and fill it in. */
+ ret = chsc_determine_channel_path_description(chpid, &chp->desc);
+ if (ret)
+ goto out_free;
+ /* Get channel-measurement characteristics. */
+ if (css_characteristics_avail && css_chsc_characteristics.scmc
+ && css_chsc_characteristics.secm) {
+ ret = chsc_get_channel_measurement_chars(chp);
+ if (ret)
+ goto out_free;
+ } else {
+ static int msg_done;
+
+ if (!msg_done) {
+ printk(KERN_WARNING "cio: Channel measurements not "
+ "available, continuing.\n");
+ msg_done = 1;
+ }
+ chp->cmg = -1;
+ }
+
+ /* make it known to the system */
+ ret = device_register(&chp->dev);
+ if (ret) {
+ printk(KERN_WARNING "%s: could not register %x.%02x\n",
+ __func__, chpid.cssid, chpid.id);
+ goto out_free;
+ }
+ ret = sysfs_create_group(&chp->dev.kobj, &chp_attr_group);
+ if (ret) {
+ device_unregister(&chp->dev);
+ goto out_free;
+ }
+ mutex_lock(&css[chpid.cssid]->mutex);
+ if (css[chpid.cssid]->cm_enabled) {
+ ret = chp_add_cmg_attr(chp);
+ if (ret) {
+ sysfs_remove_group(&chp->dev.kobj, &chp_attr_group);
+ device_unregister(&chp->dev);
+ mutex_unlock(&css[chpid.cssid]->mutex);
+ goto out_free;
+ }
+ }
+ css[chpid.cssid]->chps[chpid.id] = chp;
+ mutex_unlock(&css[chpid.cssid]->mutex);
+ return ret;
+out_free:
+ kfree(chp);
+ return ret;
+}
+
+/**
+ * chp_get_chp_desc - return newly allocated channel-path description
+ * @chpid: channel-path ID
+ *
+ * On success return a newly allocated copy of the channel-path description
+ * data associated with the given channel-path ID. Return %NULL on error.
+ */
+void *chp_get_chp_desc(struct chp_id chpid)
+{
+ struct channel_path *chp;
+ struct channel_path_desc *desc;
+
+ chp = chpid_to_chp(chpid);
+ if (!chp)
+ return NULL;
+ desc = kmalloc(sizeof(struct channel_path_desc), GFP_KERNEL);
+ if (!desc)
+ return NULL;
+ memcpy(desc, &chp->desc, sizeof(struct channel_path_desc));
+ return desc;
+}
+
+/**
+ * chp_process_crw - process channel-path status change
+ * @id: channel-path ID number
+ * @status: non-zero if channel-path has become available, zero otherwise
+ *
+ * Handle channel-report-words indicating that the status of a channel-path
+ * has changed.
+ */
+int chp_process_crw(int id, int status)
+{
+ struct chp_id chpid;
+
+ chp_id_init(&chpid);
+ chpid.id = id;
+ if (status) {
+ if (!chp_is_registered(chpid))
+ chp_new(chpid);
+ return chsc_chp_online(chpid);
+ } else {
+ chsc_chp_offline(chpid);
+ return 0;
+ }
+}
Index: quilt-2.6/drivers/s390/cio/chp.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ quilt-2.6/drivers/s390/cio/chp.h 2007-04-27 16:04:53.000000000 +0200
@@ -0,0 +1,37 @@
+/*
+ * drivers/s390/cio/chp.h
+ *
+ * Copyright IBM Corp. 2007
+ * Author(s): Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
+ */
+
+#ifndef S390_CHP_H
+#define S390_CHP_H S390_CHP_H
+
+#include <linux/types.h>
+#include <linux/device.h>
+
+#include "chpid.h"
+#include "chsc.h"
+
+struct channel_path {
+ struct chp_id chpid;
+ int state;
+ struct channel_path_desc desc;
+ /* Channel-measurement related stuff: */
+ int cmg;
+ int shared;
+ void *cmg_chars;
+ struct device dev;
+};
+
+int chp_get_status(struct chp_id chpid);
+u8 chp_get_sch_opm(struct subchannel *sch);
+int chp_is_registered(struct chp_id chpid);
+void *chp_get_chp_desc(struct chp_id chpid);
+int chp_process_crw(int id, int available);
+void chp_remove_cmg_attr(struct channel_path *chp);
+int chp_add_cmg_attr(struct channel_path *chp);
+int chp_new(struct chp_id chpid);
+
+#endif /* S390_CHP_H */
Index: quilt-2.6/drivers/s390/cio/chsc.c
===================================================================
--- quilt-2.6.orig/drivers/s390/cio/chsc.c 2007-04-27 16:04:53.000000000 +0200
+++ quilt-2.6/drivers/s390/cio/chsc.c 2007-04-27 16:04:53.000000000 +0200
@@ -21,54 +21,11 @@
#include "cio_debug.h"
#include "ioasm.h"
#include "chpid.h"
+#include "chp.h"
#include "chsc.h"

static void *sei_page;

-static int new_channel_path(struct chp_id chpid);
-
-static inline struct channel_path *chpid_to_chp(struct chp_id chpid)
-{
- return css[chpid.cssid]->chps[chpid.id];
-}
-
-static void set_chp_logically_online(struct chp_id chpid, int onoff)
-{
- chpid_to_chp(chpid)->state = onoff;
-}
-
-static int get_chp_status(struct chp_id chpid)
-{
- return (chpid_to_chp(chpid) ? chpid_to_chp(chpid)->state : -ENODEV);
-}
-
-void chsc_validate_chpids(struct subchannel *sch)
-{
- int mask, chp;
- struct chp_id chpid;
-
- chp_id_init(&chpid);
- for (chp = 0; chp <= 7; chp++) {
- mask = 0x80 >> chp;
- chpid.id = sch->schib.pmcw.chpid[chp];
- if (!get_chp_status(chpid))
- /* disable using this path */
- sch->opm &= ~mask;
- }
-}
-
-void chpid_is_actually_online(struct chp_id chpid)
-{
- int state;
-
- state = get_chp_status(chpid);
- if (state < 0) {
- need_rescan = 1;
- queue_work(slow_path_wq, &slow_path_work);
- } else
- WARN_ON(!state);
-}
-
/* FIXME: this is _always_ called for every subchannel. shouldn't we
* process more than one at a time? */
static int
@@ -214,8 +171,8 @@
mask = 0x80 >> j;
chpid.id = sch->ssd_info.chpid[j];
if ((sch->schib.pmcw.pim & mask) &&
- (get_chp_status(chpid) < 0))
- new_channel_path(chpid);
+ !chp_is_registered(chpid))
+ chp_new(chpid);
}
}
return ret;
@@ -227,7 +184,7 @@
int j;
int mask;
struct subchannel *sch;
- struct channel_path *chpid;
+ struct chp_id *chpid;
struct schib schib;

sch = to_subchannel(dev);
@@ -235,7 +192,7 @@
for (j = 0; j < 8; j++) {
mask = 0x80 >> j;
if ((sch->schib.pmcw.pim & mask) &&
- (sch->schib.pmcw.chpid[j] == chpid->chpid.id))
+ (sch->schib.pmcw.chpid[j] == chpid->id))
break;
}
if (j >= 8)
@@ -285,51 +242,48 @@
return 0;
}

-static void s390_set_chpid_offline(struct chp_id chpid)
+void chsc_chp_offline(struct chp_id chpid)
{
char dbf_txt[15];
- struct device *dev;

sprintf(dbf_txt, "chpr%x.%02x", chpid.cssid, chpid.id);
CIO_TRACE_EVENT(2, dbf_txt);

- if (get_chp_status(chpid) <= 0)
+ if (chp_get_status(chpid) <= 0)
return;
- dev = get_device(&(chpid_to_chp(chpid)->dev));
- bus_for_each_dev(&css_bus_type, NULL, to_channelpath(dev),
+ bus_for_each_dev(&css_bus_type, NULL, &chpid,
s390_subchannel_remove_chpid);

if (need_rescan || css_slow_subchannels_exist())
queue_work(slow_path_wq, &slow_path_work);
- put_device(dev);
}

struct res_acc_data {
- struct channel_path *chp;
+ struct chp_id chpid;
u32 fla_mask;
u16 fla;
};

-static int
-s390_process_res_acc_sch(struct res_acc_data *res_data, struct subchannel *sch)
+static int s390_process_res_acc_sch(struct res_acc_data *res_data,
+ struct subchannel *sch)
{
int found;
int chp;
int ccode;
-
+
found = 0;
for (chp = 0; chp <= 7; chp++)
/*
* check if chpid is in information updated by ssd
*/
if (sch->ssd_info.valid &&
- sch->ssd_info.chpid[chp] == res_data->chp->chpid.id &&
+ sch->ssd_info.chpid[chp] == res_data->chpid.id &&
(sch->ssd_info.fla[chp] & res_data->fla_mask)
== res_data->fla) {
found = 1;
break;
}
-
+
if (found == 0)
return 0;

@@ -416,8 +370,8 @@
int rc;
char dbf_txt[15];

- sprintf(dbf_txt, "accpr%x.%02x", res_data->chp->chpid.cssid,
- res_data->chp->chpid.id);
+ sprintf(dbf_txt, "accpr%x.%02x", res_data->chpid.cssid,
+ res_data->chpid.id);
CIO_TRACE_EVENT( 2, dbf_txt);
if (res_data->fla != 0) {
sprintf(dbf_txt, "fla%x", res_data->fla);
@@ -503,7 +457,7 @@
else {
chp_id_init(&chpid);
chpid.id = id;
- s390_set_chpid_offline(chpid);
+ chsc_chp_offline(chpid);
}

return 0;
@@ -512,7 +466,6 @@
static int chsc_process_sei_res_acc(struct chsc_sei_area *sei_area)
{
struct res_acc_data res_data;
- struct device *dev;
struct chp_id chpid;
int status;
int rc;
@@ -524,14 +477,13 @@
chp_id_init(&chpid);
chpid.id = sei_area->rsid;
/* allocate a new channel path structure, if needed */
- status = get_chp_status(chpid);
+ status = chp_get_status(chpid);
if (status < 0)
- new_channel_path(chpid);
+ chp_new(chpid);
else if (!status)
return 0;
- dev = get_device(&(chpid_to_chp(chpid)->dev));
memset(&res_data, 0, sizeof(struct res_acc_data));
- res_data.chp = to_channelpath(dev);
+ res_data.chpid = chpid;
if ((sei_area->vf & 0xc0) != 0) {
res_data.fla = sei_area->fla;
if ((sei_area->vf & 0xc0) == 0xc0)
@@ -542,7 +494,6 @@
res_data.fla_mask = 0xff00;
}
rc = s390_process_res_acc(&res_data);
- put_device(dev);

return rc;
}
@@ -634,10 +585,10 @@
__chp_add(struct subchannel_id schid, void *data)
{
int i, mask;
- struct channel_path *chp;
+ struct chp_id *chpid;
struct subchannel *sch;

- chp = data;
+ chpid = data;
sch = get_subchannel_by_schid(schid);
if (!sch)
/* Check if the subchannel is now available. */
@@ -646,7 +597,7 @@
for (i=0; i<8; i++) {
mask = 0x80 >> i;
if ((sch->schib.pmcw.pim & mask) &&
- (sch->schib.pmcw.chpid[i] == chp->chpid.id)) {
+ (sch->schib.pmcw.chpid[i] == chpid->id)) {
if (stsch(sch->schid, &sch->schib) != 0) {
/* Endgame. */
spin_unlock_irq(sch->lock);
@@ -672,52 +623,24 @@
return 0;
}

-static int chp_add(struct chp_id chpid)
+int chsc_chp_online(struct chp_id chpid)
{
int rc;
char dbf_txt[15];
- struct device *dev;

- if (!get_chp_status(chpid))
- return 0; /* no need to do the rest */
-
sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id);
CIO_TRACE_EVENT(2, dbf_txt);

- dev = get_device(&(chpid_to_chp(chpid)->dev));
- rc = for_each_subchannel(__chp_add, to_channelpath(dev));
+ if (chp_get_status(chpid) == 0)
+ return 0;
+ rc = for_each_subchannel(__chp_add, &chpid);
if (css_slow_subchannels_exist())
rc = -EAGAIN;
if (rc != -EAGAIN)
rc = 0;
- put_device(dev);
return rc;
}

-/*
- * Handling of crw machine checks with channel path source.
- */
-int chp_process_crw(int id, int on)
-{
- struct chp_id chpid;
-
- chp_id_init(&chpid);
- chpid.id = id;
- if (on == 0) {
- /* Path has gone. We use the link incident routine.*/
- s390_set_chpid_offline(chpid);
- return 0; /* De-register is async anyway. */
- }
- /*
- * Path has come. Allocate a new channel path structure,
- * if needed.
- */
- if (get_chp_status(chpid) < 0)
- new_channel_path(chpid);
- /* Avoid the extra overhead in process_rec_acc. */
- return chp_add(chpid);
-}
-
static int check_for_io_on_path(struct subchannel *sch, int index)
{
int cc;
@@ -844,34 +767,13 @@
return 0;
}

-/*
- * Function: s390_vary_chpid
- * Varies the specified chpid online or offline
+/**
+ * chsc_chp_vary - propagate channel-path vary operation to subchannels
+ * @chpid: channl-path ID
+ * @on: non-zero for vary online, zero for vary offline
*/
-static int s390_vary_chpid(struct chp_id chpid, int on)
+int chsc_chp_vary(struct chp_id chpid, int on)
{
- char dbf_text[15];
- int status;
-
- sprintf(dbf_text, on?"varyon%x.%02x":"varyoff%x.%02x", chpid.cssid,
- chpid.id);
- CIO_TRACE_EVENT( 2, dbf_text);
-
- status = get_chp_status(chpid);
- if (status < 0) {
- printk(KERN_ERR "Can't vary unknown chpid %x.%02x\n",
- chpid.cssid, chpid.id);
- return -EINVAL;
- }
-
- if (!on && !status) {
- printk(KERN_ERR "chpid %x.%02x is already offline\n",
- chpid.cssid, chpid.id);
- return -EINVAL;
- }
-
- set_chp_logically_online(chpid, on);
-
/*
* Redo PathVerification on the devices the chpid connects to
*/
@@ -887,112 +789,6 @@
return 0;
}

-/*
- * Channel measurement related functions
- */
-static ssize_t
-chp_measurement_chars_read(struct kobject *kobj, char *buf, loff_t off,
- size_t count)
-{
- struct channel_path *chp;
- unsigned int size;
-
- chp = to_channelpath(container_of(kobj, struct device, kobj));
- 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;
-}
-
-static struct bin_attribute chp_measurement_chars_attr = {
- .attr = {
- .name = "measurement_chars",
- .mode = S_IRUSR,
- .owner = THIS_MODULE,
- },
- .size = sizeof(struct cmg_chars),
- .read = chp_measurement_chars_read,
-};
-
-static void chp_measurement_copy_block(struct cmg_entry *buf,
- struct channel_subsystem *css, struct chp_id chpid)
-{
- void *area;
- struct cmg_entry *entry, reference_buf;
- int idx;
-
- if (chpid.id < 128) {
- area = css->cub_addr1;
- idx = chpid.id;
- } else {
- area = css->cub_addr2;
- idx = chpid.id - 128;
- }
- entry = area + (idx * sizeof(struct cmg_entry));
- do {
- memcpy(buf, entry, sizeof(*entry));
- memcpy(&reference_buf, entry, sizeof(*entry));
- } while (reference_buf.values[0] != buf->values[0]);
-}
-
-static ssize_t
-chp_measurement_read(struct kobject *kobj, char *buf, loff_t off, size_t count)
-{
- struct channel_path *chp;
- struct channel_subsystem *css;
- unsigned int size;
-
- chp = to_channelpath(container_of(kobj, struct device, kobj));
- css = to_css(chp->dev.parent);
-
- size = sizeof(struct cmg_entry);
-
- /* Only allow single reads. */
- if (off || count < size)
- return 0;
- chp_measurement_copy_block((struct cmg_entry *)buf, css, chp->chpid);
- count = size;
- return count;
-}
-
-static struct bin_attribute chp_measurement_attr = {
- .attr = {
- .name = "measurement",
- .mode = S_IRUSR,
- .owner = THIS_MODULE,
- },
- .size = sizeof(struct cmg_entry),
- .read = chp_measurement_read,
-};
-
-static void
-chsc_remove_chp_cmg_attr(struct channel_path *chp)
-{
- device_remove_bin_file(&chp->dev, &chp_measurement_chars_attr);
- device_remove_bin_file(&chp->dev, &chp_measurement_attr);
-}
-
-static int
-chsc_add_chp_cmg_attr(struct channel_path *chp)
-{
- int ret;
-
- ret = device_create_bin_file(&chp->dev, &chp_measurement_chars_attr);
- if (ret)
- return ret;
- ret = device_create_bin_file(&chp->dev, &chp_measurement_attr);
- if (ret)
- device_remove_bin_file(&chp->dev, &chp_measurement_chars_attr);
- return ret;
-}
-
static void
chsc_remove_cmg_attr(struct channel_subsystem *css)
{
@@ -1001,7 +797,7 @@
for (i = 0; i <= __MAX_CHPID; i++) {
if (!css->chps[i])
continue;
- chsc_remove_chp_cmg_attr(css->chps[i]);
+ chp_remove_cmg_attr(css->chps[i]);
}
}

@@ -1014,7 +810,7 @@
for (i = 0; i <= __MAX_CHPID; i++) {
if (!css->chps[i])
continue;
- ret = chsc_add_chp_cmg_attr(css->chps[i]);
+ ret = chp_add_cmg_attr(css->chps[i]);
if (ret)
goto cleanup;
}
@@ -1023,12 +819,11 @@
for (--i; i >= 0; i--) {
if (!css->chps[i])
continue;
- chsc_remove_chp_cmg_attr(css->chps[i]);
+ chp_remove_cmg_attr(css->chps[i]);
}
return ret;
}

-
static int
__chsc_do_secm(struct channel_subsystem *css, int enable, void *page)
{
@@ -1143,108 +938,8 @@
return ret;
}

-/*
- * Files for the channel path entries.
- */
-static ssize_t
-chp_status_show(struct device *dev, struct device_attribute *attr, char *buf)
-{
- struct channel_path *chp = container_of(dev, struct channel_path, dev);
-
- if (!chp)
- return 0;
- return (get_chp_status(chp->chpid) ? sprintf(buf, "online\n") :
- sprintf(buf, "offline\n"));
-}
-
-static ssize_t
-chp_status_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
-{
- struct channel_path *cp = container_of(dev, struct channel_path, dev);
- char cmd[10];
- int num_args;
- int error;
-
- num_args = sscanf(buf, "%5s", cmd);
- if (!num_args)
- return count;
-
- if (!strnicmp(cmd, "on", 2) || !strcmp(cmd, "1"))
- error = s390_vary_chpid(cp->chpid, 1);
- else if (!strnicmp(cmd, "off", 3) || !strcmp(cmd, "0"))
- error = s390_vary_chpid(cp->chpid, 0);
- else
- error = -EINVAL;
-
- return error < 0 ? error : count;
-
-}
-
-static DEVICE_ATTR(status, 0644, chp_status_show, chp_status_write);
-
-static ssize_t
-chp_type_show(struct device *dev, struct device_attribute *attr, char *buf)
-{
- struct channel_path *chp = container_of(dev, struct channel_path, dev);
-
- if (!chp)
- return 0;
- return sprintf(buf, "%x\n", chp->desc.desc);
-}
-
-static DEVICE_ATTR(type, 0444, chp_type_show, NULL);
-
-static ssize_t
-chp_cmg_show(struct device *dev, struct device_attribute *attr, char *buf)
-{
- struct channel_path *chp = to_channelpath(dev);
-
- if (!chp)
- return 0;
- if (chp->cmg == -1) /* channel measurements not available */
- return sprintf(buf, "unknown\n");
- return sprintf(buf, "%x\n", chp->cmg);
-}
-
-static DEVICE_ATTR(cmg, 0444, chp_cmg_show, NULL);
-
-static ssize_t
-chp_shared_show(struct device *dev, struct device_attribute *attr, char *buf)
-{
- struct channel_path *chp = to_channelpath(dev);
-
- if (!chp)
- return 0;
- if (chp->shared == -1) /* channel measurements not available */
- return sprintf(buf, "unknown\n");
- return sprintf(buf, "%x\n", chp->shared);
-}
-
-static DEVICE_ATTR(shared, 0444, chp_shared_show, NULL);
-
-static struct attribute * chp_attrs[] = {
- &dev_attr_status.attr,
- &dev_attr_type.attr,
- &dev_attr_cmg.attr,
- &dev_attr_shared.attr,
- NULL,
-};
-
-static struct attribute_group chp_attr_group = {
- .attrs = chp_attrs,
-};
-
-static void
-chp_release(struct device *dev)
-{
- struct channel_path *cp;
-
- cp = container_of(dev, struct channel_path, dev);
- kfree(cp);
-}
-
-static int chsc_determine_channel_path_description(struct chp_id chpid,
- struct channel_path_desc *desc)
+int chsc_determine_channel_path_description(struct chp_id chpid,
+ struct channel_path_desc *desc)
{
int ccode, ret;

@@ -1331,8 +1026,7 @@
}
}

-static int
-chsc_get_channel_measurement_chars(struct channel_path *chp)
+int chsc_get_channel_measurement_chars(struct channel_path *chp)
{
int ccode, ret;

@@ -1407,97 +1101,6 @@
return ret;
}

-/*
- * Entries for chpids on the system bus.
- * This replaces /proc/chpids.
- */
-static int new_channel_path(struct chp_id chpid)
-{
- struct channel_path *chp;
- int ret;
-
- chp = kzalloc(sizeof(struct channel_path), GFP_KERNEL);
- if (!chp)
- return -ENOMEM;
-
- /* fill in status, etc. */
- chp->chpid = chpid;
- chp->state = 1;
- chp->dev.parent = &css[chpid.cssid]->device;
- chp->dev.release = chp_release;
- snprintf(chp->dev.bus_id, BUS_ID_SIZE, "chp%x.%02x", chpid.cssid,
- chpid.id);
-
- /* Obtain channel path description and fill it in. */
- ret = chsc_determine_channel_path_description(chpid, &chp->desc);
- if (ret)
- goto out_free;
- /* Get channel-measurement characteristics. */
- if (css_characteristics_avail && css_chsc_characteristics.scmc
- && css_chsc_characteristics.secm) {
- ret = chsc_get_channel_measurement_chars(chp);
- if (ret)
- goto out_free;
- } else {
- static int msg_done;
-
- if (!msg_done) {
- printk(KERN_WARNING "cio: Channel measurements not "
- "available, continuing.\n");
- msg_done = 1;
- }
- chp->cmg = -1;
- }
-
- /* make it known to the system */
- ret = device_register(&chp->dev);
- if (ret) {
- printk(KERN_WARNING "%s: could not register %x.%02x\n",
- __func__, chpid.cssid, chpid.id);
- goto out_free;
- }
- ret = sysfs_create_group(&chp->dev.kobj, &chp_attr_group);
- if (ret) {
- device_unregister(&chp->dev);
- goto out_free;
- }
- mutex_lock(&css[chpid.cssid]->mutex);
- if (css[chpid.cssid]->cm_enabled) {
- ret = chsc_add_chp_cmg_attr(chp);
- if (ret) {
- sysfs_remove_group(&chp->dev.kobj, &chp_attr_group);
- device_unregister(&chp->dev);
- mutex_unlock(&css[chpid.cssid]->mutex);
- goto out_free;
- }
- }
- css[chpid.cssid]->chps[chpid.id] = chp;
- mutex_unlock(&css[chpid.cssid]->mutex);
- return ret;
-out_free:
- kfree(chp);
- return ret;
-}
-
-void *
-chsc_get_chp_desc(struct subchannel *sch, int chp_no)
-{
- struct channel_path *chp;
- struct channel_path_desc *desc;
- struct chp_id chpid;
-
- chp_id_init(&chpid);
- chpid.id = sch->schib.pmcw.chpid[chp_no];
- chp = chpid_to_chp(chpid);
- if (!chp)
- return NULL;
- desc = kmalloc(sizeof(struct channel_path_desc), GFP_KERNEL);
- if (!desc)
- return NULL;
- memcpy(desc, &chp->desc, sizeof(struct channel_path_desc));
- return desc;
-}
-
static int __init
chsc_alloc_sei_area(void)
{
Index: quilt-2.6/drivers/s390/cio/chsc.h
===================================================================
--- quilt-2.6.orig/drivers/s390/cio/chsc.h 2007-04-27 16:04:52.000000000 +0200
+++ quilt-2.6/drivers/s390/cio/chsc.h 2007-04-27 16:04:53.000000000 +0200
@@ -5,10 +5,6 @@
#include <linux/device.h>
#include "chpid.h"

-#define CHSC_SEI_ACC_CHPID 1
-#define CHSC_SEI_ACC_LINKADDR 2
-#define CHSC_SEI_ACC_FULLLINKADDR 3
-
#define CHSC_SDA_OC_MSS 0x2

struct chsc_header {
@@ -37,23 +33,10 @@
u8 chpp;
} __attribute__ ((packed));

-struct channel_path {
- struct chp_id chpid;
- int state;
- struct channel_path_desc desc;
- /* Channel-measurement related stuff: */
- int cmg;
- int shared;
- void *cmg_chars;
- struct device dev;
-};
-
-extern void s390_process_css( void );
-extern void chsc_validate_chpids(struct subchannel *);
-extern void chpid_is_actually_online(struct chp_id);
+struct channel_path;
+
extern int css_get_ssd_info(struct subchannel *);
extern int chsc_process_crw(void);
-extern int chp_process_crw(int, int);

struct css_general_char {
u64 : 41;
@@ -89,12 +72,15 @@
extern int chsc_determine_css_characteristics(void);
extern int css_characteristics_avail;

-extern void *chsc_get_chp_desc(struct subchannel*, int);
-
extern int chsc_enable_facility(int);
struct channel_subsystem;
extern int chsc_secm(struct channel_subsystem *, int);

-#define to_channelpath(device) container_of(device, struct channel_path, dev)
+int chsc_chp_vary(struct chp_id chpid, int on);
+int chsc_determine_channel_path_description(struct chp_id chpid,
+ struct channel_path_desc *desc);
+int 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);

#endif
Index: quilt-2.6/drivers/s390/cio/cio.c
===================================================================
--- quilt-2.6.orig/drivers/s390/cio/cio.c 2007-04-27 16:04:52.000000000 +0200
+++ quilt-2.6/drivers/s390/cio/cio.c 2007-04-27 16:04:53.000000000 +0200
@@ -29,6 +29,7 @@
#include "ioasm.h"
#include "blacklist.h"
#include "cio_debug.h"
+#include "chp.h"
#include "../s390mach.h"

debug_info_t *cio_debug_msg_id;
@@ -592,9 +593,10 @@
err = -ENODEV;
goto out;
}
- sch->opm = 0xff;
- if (!cio_is_console(sch->schid))
- chsc_validate_chpids(sch);
+ if (cio_is_console(sch->schid))
+ sch->opm = 0xff;
+ else
+ sch->opm = chp_get_sch_opm(sch);
sch->lpm = sch->schib.pmcw.pam & sch->opm;

CIO_DEBUG(KERN_INFO, 0,
Index: quilt-2.6/drivers/s390/cio/css.h
===================================================================
--- quilt-2.6.orig/drivers/s390/cio/css.h 2007-04-27 16:01:49.000000000 +0200
+++ quilt-2.6/drivers/s390/cio/css.h 2007-04-27 16:04:53.000000000 +0200
@@ -4,6 +4,7 @@
#include <linux/mutex.h>
#include <linux/wait.h>
#include <linux/workqueue.h>
+#include <linux/device.h>

#include <asm/cio.h>

Index: quilt-2.6/drivers/s390/cio/device_fsm.c
===================================================================
--- quilt-2.6.orig/drivers/s390/cio/device_fsm.c 2007-04-27 16:04:52.000000000 +0200
+++ quilt-2.6/drivers/s390/cio/device_fsm.c 2007-04-27 16:04:53.000000000 +0200
@@ -23,6 +23,7 @@
#include "chsc.h"
#include "ioasm.h"
#include "chpid.h"
+#include "chp.h"

int
device_is_online(struct subchannel *sch)
@@ -221,7 +222,10 @@
if (old_lpm & mask)
continue;
chpid.id = sch->schib.pmcw.chpid[i];
- chpid_is_actually_online(chpid);
+ if (!chp_is_registered(chpid)) {
+ need_rescan = 1;
+ queue_work(slow_path_wq, &slow_path_work);
+ }
}
}

Index: quilt-2.6/drivers/s390/cio/device_ops.c
===================================================================
--- quilt-2.6.orig/drivers/s390/cio/device_ops.c 2007-04-27 16:01:49.000000000 +0200
+++ quilt-2.6/drivers/s390/cio/device_ops.c 2007-04-27 16:04:53.000000000 +0200
@@ -22,6 +22,8 @@
#include "css.h"
#include "chsc.h"
#include "device.h"
+#include "chpid.h"
+#include "chp.h"

int ccw_device_set_options_mask(struct ccw_device *cdev, unsigned long flags)
{
@@ -606,9 +608,12 @@
ccw_device_get_chp_desc(struct ccw_device *cdev, int chp_no)
{
struct subchannel *sch;
+ struct chp_id chpid;

sch = to_subchannel(cdev->dev.parent);
- return chsc_get_chp_desc(sch, chp_no);
+ chp_id_init(&chpid);
+ chpid.id = sch->schib.pmcw.chpid[chp_no];
+ return chp_get_chp_desc(chpid);
}

// FIXME: these have to go:
Index: quilt-2.6/drivers/s390/cio/Makefile
===================================================================
--- quilt-2.6.orig/drivers/s390/cio/Makefile 2007-04-27 16:01:49.000000000 +0200
+++ quilt-2.6/drivers/s390/cio/Makefile 2007-04-27 16:04:53.000000000 +0200
@@ -2,7 +2,7 @@
# Makefile for the S/390 common i/o drivers
#

-obj-y += airq.o blacklist.o chsc.o cio.o css.o
+obj-y += airq.o blacklist.o chsc.o cio.o css.o chp.o
ccw_device-objs += device.o device_fsm.o device_ops.o
ccw_device-objs += device_id.o device_pgid.o device_status.o
obj-y += ccw_device.o cmf.o
Index: quilt-2.6/drivers/s390/s390mach.c
===================================================================
--- quilt-2.6.orig/drivers/s390/s390mach.c 2007-04-27 16:01:49.000000000 +0200
+++ quilt-2.6/drivers/s390/s390mach.c 2007-04-27 16:04:53.000000000 +0200
@@ -21,6 +21,7 @@
#include "cio/cio.h"
#include "cio/chsc.h"
#include "cio/css.h"
+#include "cio/chp.h"
#include "s390mach.h"

static struct semaphore m_sem;