aboutsummaryrefslogtreecommitdiff
path: root/drivers/s390/cio/chsc_sch.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/s390/cio/chsc_sch.c')
-rw-r--r--drivers/s390/cio/chsc_sch.c251
1 files changed, 224 insertions, 27 deletions
diff --git a/drivers/s390/cio/chsc_sch.c b/drivers/s390/cio/chsc_sch.c
index 93eca1731b8..3d22d2a4ce1 100644
--- a/drivers/s390/cio/chsc_sch.c
+++ b/drivers/s390/cio/chsc_sch.c
@@ -1,16 +1,21 @@
/*
* Driver for s390 chsc subchannels
*
- * Copyright IBM Corp. 2008
+ * Copyright IBM Corp. 2008, 2011
+ *
* Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
*
*/
+#include <linux/slab.h>
+#include <linux/compat.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/uaccess.h>
#include <linux/miscdevice.h>
+#include <linux/kernel_stat.h>
+#include <asm/compat.h>
#include <asm/cio.h>
#include <asm/chsc.h>
#include <asm/isc.h>
@@ -24,6 +29,10 @@
static debug_info_t *chsc_debug_msg_id;
static debug_info_t *chsc_debug_log_id;
+static struct chsc_request *on_close_request;
+static struct chsc_async_area *on_close_chsc_area;
+static DEFINE_MUTEX(on_close_mutex);
+
#define CHSC_MSG(imp, args...) do { \
debug_sprintf_event(chsc_debug_msg_id, imp , ##args); \
} while (0)
@@ -47,12 +56,14 @@ MODULE_LICENSE("GPL");
static void chsc_subchannel_irq(struct subchannel *sch)
{
- struct chsc_private *private = sch->private;
+ struct chsc_private *private = dev_get_drvdata(&sch->dev);
struct chsc_request *request = private->request;
- struct irb *irb = (struct irb *)__LC_IRB;
+ struct irb *irb = &__get_cpu_var(cio_irb);
CHSC_LOG(4, "irb");
CHSC_LOG_HEX(4, irb, sizeof(*irb));
+ inc_irq_stat(IRQIO_CSC);
+
/* Copy irb to provided request and set done. */
if (!request) {
CHSC_MSG(0, "Interrupt on sch 0.%x.%04x with no request\n",
@@ -77,13 +88,14 @@ static int chsc_subchannel_probe(struct subchannel *sch)
private = kzalloc(sizeof(*private), GFP_KERNEL);
if (!private)
return -ENOMEM;
+ dev_set_drvdata(&sch->dev, private);
ret = cio_enable_subchannel(sch, (u32)(unsigned long)sch);
if (ret) {
CHSC_MSG(0, "Failed to enable 0.%x.%04x: %d\n",
sch->schid.ssid, sch->schid.sch_no, ret);
+ dev_set_drvdata(&sch->dev, NULL);
kfree(private);
} else {
- sch->private = private;
if (dev_get_uevent_suppress(&sch->dev)) {
dev_set_uevent_suppress(&sch->dev, 0);
kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
@@ -97,8 +109,8 @@ static int chsc_subchannel_remove(struct subchannel *sch)
struct chsc_private *private;
cio_disable_subchannel(sch);
- private = sch->private;
- sch->private = NULL;
+ private = dev_get_drvdata(&sch->dev);
+ dev_set_drvdata(&sch->dev, NULL);
if (private->request) {
complete(&private->request->completion);
put_device(&sch->dev);
@@ -112,6 +124,31 @@ static void chsc_subchannel_shutdown(struct subchannel *sch)
cio_disable_subchannel(sch);
}
+static int chsc_subchannel_prepare(struct subchannel *sch)
+{
+ int cc;
+ struct schib schib;
+ /*
+ * Don't allow suspend while the subchannel is not idle
+ * since we don't have a way to clear the subchannel and
+ * cannot disable it with a request running.
+ */
+ cc = stsch_err(sch->schid, &schib);
+ if (!cc && scsw_stctl(&schib.scsw))
+ return -EAGAIN;
+ return 0;
+}
+
+static int chsc_subchannel_freeze(struct subchannel *sch)
+{
+ return cio_disable_subchannel(sch);
+}
+
+static int chsc_subchannel_restore(struct subchannel *sch)
+{
+ return cio_enable_subchannel(sch, (u32)(unsigned long)sch);
+}
+
static struct css_device_id chsc_subchannel_ids[] = {
{ .match_flags = 0x1, .type =SUBCHANNEL_TYPE_CHSC, },
{ /* end of list */ },
@@ -119,19 +156,24 @@ static struct css_device_id chsc_subchannel_ids[] = {
MODULE_DEVICE_TABLE(css, chsc_subchannel_ids);
static struct css_driver chsc_subchannel_driver = {
- .owner = THIS_MODULE,
+ .drv = {
+ .owner = THIS_MODULE,
+ .name = "chsc_subchannel",
+ },
.subchannel_type = chsc_subchannel_ids,
.irq = chsc_subchannel_irq,
.probe = chsc_subchannel_probe,
.remove = chsc_subchannel_remove,
.shutdown = chsc_subchannel_shutdown,
- .name = "chsc_subchannel",
+ .prepare = chsc_subchannel_prepare,
+ .freeze = chsc_subchannel_freeze,
+ .thaw = chsc_subchannel_restore,
+ .restore = chsc_subchannel_restore,
};
static int __init chsc_init_dbfs(void)
{
- chsc_debug_msg_id = debug_register("chsc_msg", 16, 1,
- 16 * sizeof(long));
+ chsc_debug_msg_id = debug_register("chsc_msg", 8, 1, 4 * sizeof(long));
if (!chsc_debug_msg_id)
goto out;
debug_register_view(chsc_debug_msg_id, &debug_sprintf_view);
@@ -206,10 +248,10 @@ static int chsc_async(struct chsc_async_area *chsc_area,
int ret = -ENODEV;
char dbf[10];
- chsc_area->header.key = PAGE_DEFAULT_KEY;
+ chsc_area->header.key = PAGE_DEFAULT_KEY >> 4;
while ((sch = chsc_get_next_subchannel(sch))) {
spin_lock(sch->lock);
- private = sch->private;
+ private = dev_get_drvdata(&sch->dev);
if (private->request) {
spin_unlock(sch->lock);
ret = -EBUSY;
@@ -219,7 +261,7 @@ static int chsc_async(struct chsc_async_area *chsc_area,
CHSC_LOG(2, "schid");
CHSC_LOG_HEX(2, &sch->schid, sizeof(sch->schid));
cc = chsc(chsc_area);
- sprintf(dbf, "cc:%d", cc);
+ snprintf(dbf, sizeof(dbf), "cc:%d", cc);
CHSC_LOG(2, dbf);
switch (cc) {
case 0:
@@ -248,11 +290,11 @@ static int chsc_async(struct chsc_async_area *chsc_area,
return ret;
}
-static void chsc_log_command(struct chsc_async_area *chsc_area)
+static void chsc_log_command(void *chsc_area)
{
char dbf[10];
- sprintf(dbf, "CHSC:%x", chsc_area->header.code);
+ snprintf(dbf, sizeof(dbf), "CHSC:%x", ((uint16_t *)chsc_area)[1]);
CHSC_LOG(0, dbf);
CHSC_LOG_HEX(0, chsc_area, 32);
}
@@ -316,13 +358,106 @@ static int chsc_ioctl_start(void __user *user_area)
if (copy_to_user(user_area, chsc_area, PAGE_SIZE))
ret = -EFAULT;
out_free:
- sprintf(dbf, "ret:%d", ret);
+ snprintf(dbf, sizeof(dbf), "ret:%d", ret);
CHSC_LOG(0, dbf);
kfree(request);
free_page((unsigned long)chsc_area);
return ret;
}
+static int chsc_ioctl_on_close_set(void __user *user_area)
+{
+ char dbf[13];
+ int ret;
+
+ mutex_lock(&on_close_mutex);
+ if (on_close_chsc_area) {
+ ret = -EBUSY;
+ goto out_unlock;
+ }
+ on_close_request = kzalloc(sizeof(*on_close_request), GFP_KERNEL);
+ if (!on_close_request) {
+ ret = -ENOMEM;
+ goto out_unlock;
+ }
+ on_close_chsc_area = (void *)get_zeroed_page(GFP_DMA | GFP_KERNEL);
+ if (!on_close_chsc_area) {
+ ret = -ENOMEM;
+ goto out_free_request;
+ }
+ if (copy_from_user(on_close_chsc_area, user_area, PAGE_SIZE)) {
+ ret = -EFAULT;
+ goto out_free_chsc;
+ }
+ ret = 0;
+ goto out_unlock;
+
+out_free_chsc:
+ free_page((unsigned long)on_close_chsc_area);
+ on_close_chsc_area = NULL;
+out_free_request:
+ kfree(on_close_request);
+ on_close_request = NULL;
+out_unlock:
+ mutex_unlock(&on_close_mutex);
+ snprintf(dbf, sizeof(dbf), "ocsret:%d", ret);
+ CHSC_LOG(0, dbf);
+ return ret;
+}
+
+static int chsc_ioctl_on_close_remove(void)
+{
+ char dbf[13];
+ int ret;
+
+ mutex_lock(&on_close_mutex);
+ if (!on_close_chsc_area) {
+ ret = -ENOENT;
+ goto out_unlock;
+ }
+ free_page((unsigned long)on_close_chsc_area);
+ on_close_chsc_area = NULL;
+ kfree(on_close_request);
+ on_close_request = NULL;
+ ret = 0;
+out_unlock:
+ mutex_unlock(&on_close_mutex);
+ snprintf(dbf, sizeof(dbf), "ocrret:%d", ret);
+ CHSC_LOG(0, dbf);
+ return ret;
+}
+
+static int chsc_ioctl_start_sync(void __user *user_area)
+{
+ struct chsc_sync_area *chsc_area;
+ int ret, ccode;
+
+ chsc_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
+ if (!chsc_area)
+ return -ENOMEM;
+ if (copy_from_user(chsc_area, user_area, PAGE_SIZE)) {
+ ret = -EFAULT;
+ goto out_free;
+ }
+ if (chsc_area->header.code & 0x4000) {
+ ret = -EINVAL;
+ goto out_free;
+ }
+ chsc_log_command(chsc_area);
+ ccode = chsc(chsc_area);
+ if (ccode != 0) {
+ ret = -EIO;
+ goto out_free;
+ }
+ if (copy_to_user(user_area, chsc_area, PAGE_SIZE))
+ ret = -EFAULT;
+ else
+ ret = 0;
+out_free:
+ free_page((unsigned long)chsc_area);
+ return ret;
+}
+
static int chsc_ioctl_info_channel_path(void __user *user_cd)
{
struct chsc_chp_cd *cd;
@@ -656,25 +791,31 @@ out_free:
static int chsc_ioctl_chpd(void __user *user_chpd)
{
+ struct chsc_scpd *scpd_area;
struct chsc_cpd_info *chpd;
int ret;
chpd = kzalloc(sizeof(*chpd), GFP_KERNEL);
- if (!chpd)
- return -ENOMEM;
+ scpd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
+ if (!scpd_area || !chpd) {
+ ret = -ENOMEM;
+ goto out_free;
+ }
if (copy_from_user(chpd, user_chpd, sizeof(*chpd))) {
ret = -EFAULT;
goto out_free;
}
ret = chsc_determine_channel_path_desc(chpd->chpid, chpd->fmt,
chpd->rfmt, chpd->c, chpd->m,
- &chpd->chpdb);
+ scpd_area);
if (ret)
goto out_free;
+ memcpy(&chpd->chpdb, &scpd_area->response, scpd_area->response.length);
if (copy_to_user(user_chpd, chpd, sizeof(*chpd)))
ret = -EFAULT;
out_free:
kfree(chpd);
+ free_page((unsigned long)scpd_area);
return ret;
}
@@ -740,33 +881,89 @@ out_free:
static long chsc_ioctl(struct file *filp, unsigned int cmd,
unsigned long arg)
{
+ void __user *argp;
+
CHSC_MSG(2, "chsc_ioctl called, cmd=%x\n", cmd);
+ if (is_compat_task())
+ argp = compat_ptr(arg);
+ else
+ argp = (void __user *)arg;
switch (cmd) {
case CHSC_START:
- return chsc_ioctl_start((void __user *)arg);
+ return chsc_ioctl_start(argp);
+ case CHSC_START_SYNC:
+ return chsc_ioctl_start_sync(argp);
case CHSC_INFO_CHANNEL_PATH:
- return chsc_ioctl_info_channel_path((void __user *)arg);
+ return chsc_ioctl_info_channel_path(argp);
case CHSC_INFO_CU:
- return chsc_ioctl_info_cu((void __user *)arg);
+ return chsc_ioctl_info_cu(argp);
case CHSC_INFO_SCH_CU:
- return chsc_ioctl_info_sch_cu((void __user *)arg);
+ return chsc_ioctl_info_sch_cu(argp);
case CHSC_INFO_CI:
- return chsc_ioctl_conf_info((void __user *)arg);
+ return chsc_ioctl_conf_info(argp);
case CHSC_INFO_CCL:
- return chsc_ioctl_conf_comp_list((void __user *)arg);
+ return chsc_ioctl_conf_comp_list(argp);
case CHSC_INFO_CPD:
- return chsc_ioctl_chpd((void __user *)arg);
+ return chsc_ioctl_chpd(argp);
case CHSC_INFO_DCAL:
- return chsc_ioctl_dcal((void __user *)arg);
+ return chsc_ioctl_dcal(argp);
+ case CHSC_ON_CLOSE_SET:
+ return chsc_ioctl_on_close_set(argp);
+ case CHSC_ON_CLOSE_REMOVE:
+ return chsc_ioctl_on_close_remove();
default: /* unknown ioctl number */
return -ENOIOCTLCMD;
}
}
+static atomic_t chsc_ready_for_use = ATOMIC_INIT(1);
+
+static int chsc_open(struct inode *inode, struct file *file)
+{
+ if (!atomic_dec_and_test(&chsc_ready_for_use)) {
+ atomic_inc(&chsc_ready_for_use);
+ return -EBUSY;
+ }
+ return nonseekable_open(inode, file);
+}
+
+static int chsc_release(struct inode *inode, struct file *filp)
+{
+ char dbf[13];
+ int ret;
+
+ mutex_lock(&on_close_mutex);
+ if (!on_close_chsc_area)
+ goto out_unlock;
+ init_completion(&on_close_request->completion);
+ CHSC_LOG(0, "on_close");
+ chsc_log_command(on_close_chsc_area);
+ spin_lock_irq(&chsc_lock);
+ ret = chsc_async(on_close_chsc_area, on_close_request);
+ spin_unlock_irq(&chsc_lock);
+ if (ret == -EINPROGRESS) {
+ wait_for_completion(&on_close_request->completion);
+ ret = chsc_examine_irb(on_close_request);
+ }
+ snprintf(dbf, sizeof(dbf), "relret:%d", ret);
+ CHSC_LOG(0, dbf);
+ free_page((unsigned long)on_close_chsc_area);
+ on_close_chsc_area = NULL;
+ kfree(on_close_request);
+ on_close_request = NULL;
+out_unlock:
+ mutex_unlock(&on_close_mutex);
+ atomic_inc(&chsc_ready_for_use);
+ return 0;
+}
+
static const struct file_operations chsc_fops = {
.owner = THIS_MODULE,
+ .open = chsc_open,
+ .release = chsc_release,
.unlocked_ioctl = chsc_ioctl,
.compat_ioctl = chsc_ioctl,
+ .llseek = no_llseek,
};
static struct miscdevice chsc_misc_device = {
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-05 23:05:00 +0000