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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-01-20 14:01:31 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-01-20 14:01:31 -0300
commitb4b7ff4b08e691656c9d77c758fc355833128ac0 (patch)
tree82fcb00e6b918026dc9f2d1f05ed8eee83874cc0 /drivers/s390/cio/device_pgid.c
parent35acfa0fc609f2a2cd95cef4a6a9c3a5c38f1778 (diff)
Linux-libre 4.4-gnupck-4.4-gnu
Diffstat (limited to 'drivers/s390/cio/device_pgid.c')
-rw-r--r--drivers/s390/cio/device_pgid.c70
1 files changed, 62 insertions, 8 deletions
diff --git a/drivers/s390/cio/device_pgid.c b/drivers/s390/cio/device_pgid.c
index 37ada05e8..da246b67e 100644
--- a/drivers/s390/cio/device_pgid.c
+++ b/drivers/s390/cio/device_pgid.c
@@ -9,9 +9,10 @@
#include <linux/kernel.h>
#include <linux/string.h>
+#include <linux/bitops.h>
#include <linux/types.h>
#include <linux/errno.h>
-#include <linux/bitops.h>
+#include <linux/slab.h>
#include <asm/ccwdev.h>
#include <asm/cio.h>
@@ -133,7 +134,7 @@ static void spid_build_cp(struct ccw_device *cdev, u8 fn)
{
struct ccw_request *req = &cdev->private->req;
struct ccw1 *cp = cdev->private->iccws;
- int i = 8 - ffs(req->lpm);
+ int i = pathmask_to_pos(req->lpm);
struct pgid *pgid = &cdev->private->pgid[i];
pgid->inf.fc = fn;
@@ -434,7 +435,7 @@ static void snid_build_cp(struct ccw_device *cdev)
{
struct ccw_request *req = &cdev->private->req;
struct ccw1 *cp = cdev->private->iccws;
- int i = 8 - ffs(req->lpm);
+ int i = pathmask_to_pos(req->lpm);
/* Channel program setup. */
cp->cmd_code = CCW_CMD_SENSE_PGID;
@@ -616,6 +617,11 @@ void ccw_device_disband_start(struct ccw_device *cdev)
ccw_request_start(cdev);
}
+struct stlck_data {
+ struct completion done;
+ int rc;
+};
+
static void stlck_build_cp(struct ccw_device *cdev, void *buf1, void *buf2)
{
struct ccw_request *req = &cdev->private->req;
@@ -634,7 +640,10 @@ static void stlck_build_cp(struct ccw_device *cdev, void *buf1, void *buf2)
static void stlck_callback(struct ccw_device *cdev, void *data, int rc)
{
- ccw_device_stlck_done(cdev, data, rc);
+ struct stlck_data *sdata = data;
+
+ sdata->rc = rc;
+ complete(&sdata->done);
}
/**
@@ -645,11 +654,9 @@ static void stlck_callback(struct ccw_device *cdev, void *data, int rc)
* @buf2: data pointer used in channel program
*
* Execute a channel program on @cdev to release an existing PGID reservation.
- * When finished, call ccw_device_stlck_done with a return code specifying the
- * result.
*/
-void ccw_device_stlck_start(struct ccw_device *cdev, void *data, void *buf1,
- void *buf2)
+static void ccw_device_stlck_start(struct ccw_device *cdev, void *data,
+ void *buf1, void *buf2)
{
struct subchannel *sch = to_subchannel(cdev->dev.parent);
struct ccw_request *req = &cdev->private->req;
@@ -667,3 +674,50 @@ void ccw_device_stlck_start(struct ccw_device *cdev, void *data, void *buf1,
ccw_request_start(cdev);
}
+/*
+ * Perform unconditional reserve + release.
+ */
+int ccw_device_stlck(struct ccw_device *cdev)
+{
+ struct subchannel *sch = to_subchannel(cdev->dev.parent);
+ struct stlck_data data;
+ u8 *buffer;
+ int rc;
+
+ /* Check if steal lock operation is valid for this device. */
+ if (cdev->drv) {
+ if (!cdev->private->options.force)
+ return -EINVAL;
+ }
+ buffer = kzalloc(64, GFP_DMA | GFP_KERNEL);
+ if (!buffer)
+ return -ENOMEM;
+ init_completion(&data.done);
+ data.rc = -EIO;
+ spin_lock_irq(sch->lock);
+ rc = cio_enable_subchannel(sch, (u32) (addr_t) sch);
+ if (rc)
+ goto out_unlock;
+ /* Perform operation. */
+ cdev->private->state = DEV_STATE_STEAL_LOCK;
+ ccw_device_stlck_start(cdev, &data, &buffer[0], &buffer[32]);
+ spin_unlock_irq(sch->lock);
+ /* Wait for operation to finish. */
+ if (wait_for_completion_interruptible(&data.done)) {
+ /* Got a signal. */
+ spin_lock_irq(sch->lock);
+ ccw_request_cancel(cdev);
+ spin_unlock_irq(sch->lock);
+ wait_for_completion(&data.done);
+ }
+ rc = data.rc;
+ /* Check results. */
+ spin_lock_irq(sch->lock);
+ cio_disable_subchannel(sch);
+ cdev->private->state = DEV_STATE_BOXED;
+out_unlock:
+ spin_unlock_irq(sch->lock);
+ kfree(buffer);
+
+ return rc;
+}