s390/cio: add basic protected virtualization support

As virtio-ccw devices are channel devices, we need to use the
dma area within the common I/O layer for any communication with
the hypervisor.

Note that we do not need to use that area for control blocks
directly referenced by instructions, e.g. the orb.

It handles neither QDIO in the common code, nor any device type specific
stuff (like channel programs constructed by the DASD driver).

An interesting side effect is that virtio structures are now going to
get allocated in 31 bit addressable storage.

Signed-off-by: Halil Pasic <pasic@linux.ibm.com>
Reviewed-by: Sebastian Ott <sebott@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Michael Mueller <mimu@linux.ibm.com>
Tested-by: Michael Mueller <mimu@linux.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>

diff --git a/arch/s390/include/asm/ccwdev.h b/arch/s390/include/asm/ccwdev.h
index a29dd430fb405004ae3cf17230e8dccb81a520c7..865ce1cb86d50b86049c2328f3b69af4bb2e534d 100644 (file)
--- a/arch/s390/include/asm/ccwdev.h
+++ b/arch/s390/include/asm/ccwdev.h
@@ -226,6 +226,10 @@ extern int ccw_device_enable_console(struct ccw_device *);
 extern void ccw_device_wait_idle(struct ccw_device *);
 extern int ccw_device_force_console(struct ccw_device *);
 
+extern void *ccw_device_dma_zalloc(struct ccw_device *cdev, size_t size);
+extern void ccw_device_dma_free(struct ccw_device *cdev,
+                               void *cpu_addr, size_t size);
+
 int ccw_device_siosl(struct ccw_device *);
 
 extern void ccw_device_get_schid(struct ccw_device *, struct subchannel_id *);

diff --git a/drivers/s390/cio/ccwreq.c b/drivers/s390/cio/ccwreq.c
index 603268a33ea1a0f7a4b0d6963b40c7f90536a179..73582a0a2622c45fec7b7ca075a57f350e9a4f1d 100644 (file)
--- a/drivers/s390/cio/ccwreq.c
+++ b/drivers/s390/cio/ccwreq.c
@@ -63,7 +63,7 @@ static void ccwreq_stop(struct ccw_device *cdev, int rc)
                return;
        req->done = 1;
        ccw_device_set_timeout(cdev, 0);
-       memset(&cdev->private->irb, 0, sizeof(struct irb));
+       memset(&cdev->private->dma_area->irb, 0, sizeof(struct irb));
        if (rc && rc != -ENODEV && req->drc)
                rc = req->drc;
        req->callback(cdev, req->data, rc);
@@ -86,7 +86,7 @@ static void ccwreq_do(struct ccw_device *cdev)
                        continue;
                }
                /* Perform start function. */
-               memset(&cdev->private->irb, 0, sizeof(struct irb));
+               memset(&cdev->private->dma_area->irb, 0, sizeof(struct irb));
                rc = cio_start(sch, cp, (u8) req->mask);
                if (rc == 0) {
                        /* I/O started successfully. */
@@ -169,7 +169,7 @@ int ccw_request_cancel(struct ccw_device *cdev)
  */
 static enum io_status ccwreq_status(struct ccw_device *cdev, struct irb *lcirb)
 {
-       struct irb *irb = &cdev->private->irb;
+       struct irb *irb = &cdev->private->dma_area->irb;
        struct cmd_scsw *scsw = &irb->scsw.cmd;
        enum uc_todo todo;
 
@@ -187,7 +187,8 @@ static enum io_status ccwreq_status(struct ccw_device *cdev, struct irb *lcirb)
                CIO_TRACE_EVENT(2, "sensedata");
                CIO_HEX_EVENT(2, &cdev->private->dev_id,
                              sizeof(struct ccw_dev_id));
-               CIO_HEX_EVENT(2, &cdev->private->irb.ecw, SENSE_MAX_COUNT);
+               CIO_HEX_EVENT(2, &cdev->private->dma_area->irb.ecw,
+                             SENSE_MAX_COUNT);
                /* Check for command reject. */
                if (irb->ecw[0] & SNS0_CMD_REJECT)
                        return IO_REJECTED;

diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
index 1540229a37bbab129e39b8ef0ad943be237b86b8..9985b7484a6b75c9a6c2907512d100d8b7cea861 100644 (file)
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -24,6 +24,7 @@
 #include <linux/timer.h>
 #include <linux/kernel_stat.h>
 #include <linux/sched/signal.h>
+#include <linux/dma-mapping.h>
 
 #include <asm/ccwdev.h>
 #include <asm/cio.h>
@@ -687,6 +688,9 @@ ccw_device_release(struct device *dev)
        struct ccw_device *cdev;
 
        cdev = to_ccwdev(dev);
+       cio_gp_dma_free(cdev->private->dma_pool, cdev->private->dma_area,
+                       sizeof(*cdev->private->dma_area));
+       cio_gp_dma_destroy(cdev->private->dma_pool, &cdev->dev);
        /* Release reference of parent subchannel. */
        put_device(cdev->dev.parent);
        kfree(cdev->private);
@@ -696,15 +700,33 @@ ccw_device_release(struct device *dev)
 static struct ccw_device * io_subchannel_allocate_dev(struct subchannel *sch)
 {
        struct ccw_device *cdev;
+       struct gen_pool *dma_pool;
 
        cdev  = kzalloc(sizeof(*cdev), GFP_KERNEL);
-       if (cdev) {
-               cdev->private = kzalloc(sizeof(struct ccw_device_private),
-                                       GFP_KERNEL | GFP_DMA);
-               if (cdev->private)
-                       return cdev;
-       }
+       if (!cdev)
+               goto err_cdev;
+       cdev->private = kzalloc(sizeof(struct ccw_device_private),
+                               GFP_KERNEL | GFP_DMA);
+       if (!cdev->private)
+               goto err_priv;
+       cdev->dev.coherent_dma_mask = sch->dev.coherent_dma_mask;
+       cdev->dev.dma_mask = &cdev->dev.coherent_dma_mask;
+       dma_pool = cio_gp_dma_create(&cdev->dev, 1);
+       if (!dma_pool)
+               goto err_dma_pool;
+       cdev->private->dma_pool = dma_pool;
+       cdev->private->dma_area = cio_gp_dma_zalloc(dma_pool, &cdev->dev,
+                                       sizeof(*cdev->private->dma_area));
+       if (!cdev->private->dma_area)
+               goto err_dma_area;
+       return cdev;
+err_dma_area:
+       cio_gp_dma_destroy(dma_pool, &cdev->dev);
+err_dma_pool:
+       kfree(cdev->private);
+err_priv:
        kfree(cdev);
+err_cdev:
        return ERR_PTR(-ENOMEM);
 }
 
@@ -884,7 +906,7 @@ io_subchannel_recog_done(struct ccw_device *cdev)
                        wake_up(&ccw_device_init_wq);
                break;
        case DEV_STATE_OFFLINE:
-               /* 
+               /*
                 * We can't register the device in interrupt context so
                 * we schedule a work item.
                 */
@@ -1062,6 +1084,14 @@ static int io_subchannel_probe(struct subchannel *sch)
        if (!io_priv)
                goto out_schedule;
 
+       io_priv->dma_area = dma_alloc_coherent(&sch->dev,
+                               sizeof(*io_priv->dma_area),
+                               &io_priv->dma_area_dma, GFP_KERNEL);
+       if (!io_priv->dma_area) {
+               kfree(io_priv);
+               goto out_schedule;
+       }
+
        set_io_private(sch, io_priv);
        css_schedule_eval(sch->schid);
        return 0;
@@ -1088,6 +1118,8 @@ static int io_subchannel_remove(struct subchannel *sch)
        set_io_private(sch, NULL);
        spin_unlock_irq(sch->lock);
 out_free:
+       dma_free_coherent(&sch->dev, sizeof(*io_priv->dma_area),
+                         io_priv->dma_area, io_priv->dma_area_dma);
        kfree(io_priv);
        sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group);
        return 0;
@@ -1593,13 +1625,19 @@ struct ccw_device * __init ccw_device_create_console(struct ccw_driver *drv)
                return ERR_CAST(sch);
 
        io_priv = kzalloc(sizeof(*io_priv), GFP_KERNEL | GFP_DMA);
-       if (!io_priv) {
-               put_device(&sch->dev);
-               return ERR_PTR(-ENOMEM);
-       }
+       if (!io_priv)
+               goto err_priv;
+       io_priv->dma_area = dma_alloc_coherent(&sch->dev,
+                               sizeof(*io_priv->dma_area),
+                               &io_priv->dma_area_dma, GFP_KERNEL);
+       if (!io_priv->dma_area)
+               goto err_dma_area;
        set_io_private(sch, io_priv);
        cdev = io_subchannel_create_ccwdev(sch);
        if (IS_ERR(cdev)) {
+               dma_free_coherent(&sch->dev, sizeof(*io_priv->dma_area),
+                                 io_priv->dma_area, io_priv->dma_area_dma);
+               set_io_private(sch, NULL);
                put_device(&sch->dev);
                kfree(io_priv);
                return cdev;
@@ -1607,6 +1645,12 @@ struct ccw_device * __init ccw_device_create_console(struct ccw_driver *drv)
        cdev->drv = drv;
        ccw_device_set_int_class(cdev);
        return cdev;
+
+err_dma_area:
+       kfree(io_priv);
+err_priv:
+       put_device(&sch->dev);
+       return ERR_PTR(-ENOMEM);
 }
 
 void __init ccw_device_destroy_console(struct ccw_device *cdev)
@@ -1617,6 +1661,8 @@ void __init ccw_device_destroy_console(struct ccw_device *cdev)
        set_io_private(sch, NULL);
        put_device(&sch->dev);
        put_device(&cdev->dev);
+       dma_free_coherent(&sch->dev, sizeof(*io_priv->dma_area),
+                         io_priv->dma_area, io_priv->dma_area_dma);
        kfree(io_priv);
 }
 

diff --git a/drivers/s390/cio/device_fsm.c b/drivers/s390/cio/device_fsm.c
index 9169af7dbb434ff5269406a85200c9796c04a8e4..8fc267324ebb4703258b64f770eda3f116c2ea5b 100644 (file)
--- a/drivers/s390/cio/device_fsm.c
+++ b/drivers/s390/cio/device_fsm.c
@@ -67,8 +67,10 @@ static void ccw_timeout_log(struct ccw_device *cdev)
                               sizeof(struct tcw), 0);
        } else {
                printk(KERN_WARNING "cio: orb indicates command mode\n");
-               if ((void *)(addr_t)orb->cmd.cpa == &private->sense_ccw ||
-                   (void *)(addr_t)orb->cmd.cpa == cdev->private->iccws)
+               if ((void *)(addr_t)orb->cmd.cpa ==
+                   &private->dma_area->sense_ccw ||
+                   (void *)(addr_t)orb->cmd.cpa ==
+                   cdev->private->dma_area->iccws)
                        printk(KERN_WARNING "cio: last channel program "
                               "(intern):\n");
                else
@@ -143,18 +145,22 @@ ccw_device_cancel_halt_clear(struct ccw_device *cdev)
 void ccw_device_update_sense_data(struct ccw_device *cdev)
 {
        memset(&cdev->id, 0, sizeof(cdev->id));
-       cdev->id.cu_type   = cdev->private->senseid.cu_type;
-       cdev->id.cu_model  = cdev->private->senseid.cu_model;
-       cdev->id.dev_type  = cdev->private->senseid.dev_type;
-       cdev->id.dev_model = cdev->private->senseid.dev_model;
+       cdev->id.cu_type = cdev->private->dma_area->senseid.cu_type;
+       cdev->id.cu_model = cdev->private->dma_area->senseid.cu_model;
+       cdev->id.dev_type = cdev->private->dma_area->senseid.dev_type;
+       cdev->id.dev_model = cdev->private->dma_area->senseid.dev_model;
 }
 
 int ccw_device_test_sense_data(struct ccw_device *cdev)
 {
-       return cdev->id.cu_type == cdev->private->senseid.cu_type &&
-               cdev->id.cu_model == cdev->private->senseid.cu_model &&
-               cdev->id.dev_type == cdev->private->senseid.dev_type &&
-               cdev->id.dev_model == cdev->private->senseid.dev_model;
+       return cdev->id.cu_type ==
+               cdev->private->dma_area->senseid.cu_type &&
+               cdev->id.cu_model ==
+               cdev->private->dma_area->senseid.cu_model &&
+               cdev->id.dev_type ==
+               cdev->private->dma_area->senseid.dev_type &&
+               cdev->id.dev_model ==
+               cdev->private->dma_area->senseid.dev_model;
 }
 
 /*
@@ -342,7 +348,7 @@ ccw_device_done(struct ccw_device *cdev, int state)
                cio_disable_subchannel(sch);
 
        /* Reset device status. */
-       memset(&cdev->private->irb, 0, sizeof(struct irb));
+       memset(&cdev->private->dma_area->irb, 0, sizeof(struct irb));
 
        cdev->private->state = state;
 
@@ -509,13 +515,14 @@ callback:
                ccw_device_done(cdev, DEV_STATE_ONLINE);
                /* Deliver fake irb to device driver, if needed. */
                if (cdev->private->flags.fake_irb) {
-                       create_fake_irb(&cdev->private->irb,
+                       create_fake_irb(&cdev->private->dma_area->irb,
                                        cdev->private->flags.fake_irb);
                        cdev->private->flags.fake_irb = 0;
                        if (cdev->handler)
                                cdev->handler(cdev, cdev->private->intparm,
-                                             &cdev->private->irb);
-                       memset(&cdev->private->irb, 0, sizeof(struct irb));
+                                             &cdev->private->dma_area->irb);
+                       memset(&cdev->private->dma_area->irb, 0,
+                              sizeof(struct irb));
                }
                ccw_device_report_path_events(cdev);
                ccw_device_handle_broken_paths(cdev);
@@ -672,7 +679,8 @@ ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
 
        if (scsw_actl(&sch->schib.scsw) != 0 ||
            (scsw_stctl(&sch->schib.scsw) & SCSW_STCTL_STATUS_PEND) ||
-           (scsw_stctl(&cdev->private->irb.scsw) & SCSW_STCTL_STATUS_PEND)) {
+           (scsw_stctl(&cdev->private->dma_area->irb.scsw) &
+            SCSW_STCTL_STATUS_PEND)) {
                /*
                 * No final status yet or final status not yet delivered
                 * to the device driver. Can't do path verification now,
@@ -719,7 +727,7 @@ static int ccw_device_call_handler(struct ccw_device *cdev)
         *  - fast notification was requested (primary status)
         *  - unsolicited interrupts
         */
-       stctl = scsw_stctl(&cdev->private->irb.scsw);
+       stctl = scsw_stctl(&cdev->private->dma_area->irb.scsw);
        ending_status = (stctl & SCSW_STCTL_SEC_STATUS) ||
                (stctl == (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)) ||
                (stctl == SCSW_STCTL_STATUS_PEND);
@@ -735,9 +743,9 @@ static int ccw_device_call_handler(struct ccw_device *cdev)
 
        if (cdev->handler)
                cdev->handler(cdev, cdev->private->intparm,
-                             &cdev->private->irb);
+                             &cdev->private->dma_area->irb);
 
-       memset(&cdev->private->irb, 0, sizeof(struct irb));
+       memset(&cdev->private->dma_area->irb, 0, sizeof(struct irb));
        return 1;
 }
 
@@ -759,7 +767,8 @@ ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
                        /* Unit check but no sense data. Need basic sense. */
                        if (ccw_device_do_sense(cdev, irb) != 0)
                                goto call_handler_unsol;
-                       memcpy(&cdev->private->irb, irb, sizeof(struct irb));
+                       memcpy(&cdev->private->dma_area->irb, irb,
+                              sizeof(struct irb));
                        cdev->private->state = DEV_STATE_W4SENSE;
                        cdev->private->intparm = 0;
                        return;
@@ -842,7 +851,7 @@ ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
        if (scsw_fctl(&irb->scsw) &
            (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) {
                cdev->private->flags.dosense = 0;
-               memset(&cdev->private->irb, 0, sizeof(struct irb));
+               memset(&cdev->private->dma_area->irb, 0, sizeof(struct irb));
                ccw_device_accumulate_irb(cdev, irb);
                goto call_handler;
        }

diff --git a/drivers/s390/cio/device_id.c b/drivers/s390/cio/device_id.c
index f6df83a9dfbb9a535f2196e61730d168cff101b8..740996d0dc8c8d4dbe70af04cf501b1debfe7ca9 100644 (file)
--- a/drivers/s390/cio/device_id.c
+++ b/drivers/s390/cio/device_id.c
@@ -99,7 +99,7 @@ static int diag210_to_senseid(struct senseid *senseid, struct diag210 *diag)
 static int diag210_get_dev_info(struct ccw_device *cdev)
 {
        struct ccw_dev_id *dev_id = &cdev->private->dev_id;
-       struct senseid *senseid = &cdev->private->senseid;
+       struct senseid *senseid = &cdev->private->dma_area->senseid;
        struct diag210 diag_data;
        int rc;
 
@@ -134,8 +134,10 @@ err_failed:
 static void snsid_init(struct ccw_device *cdev)
 {
        cdev->private->flags.esid = 0;
-       memset(&cdev->private->senseid, 0, sizeof(cdev->private->senseid));
-       cdev->private->senseid.cu_type = 0xffff;
+
+       memset(&cdev->private->dma_area->senseid, 0,
+              sizeof(cdev->private->dma_area->senseid));
+       cdev->private->dma_area->senseid.cu_type = 0xffff;
 }
 
 /*
@@ -143,16 +145,16 @@ static void snsid_init(struct ccw_device *cdev)
  */
 static int snsid_check(struct ccw_device *cdev, void *data)
 {
-       struct cmd_scsw *scsw = &cdev->private->irb.scsw.cmd;
+       struct cmd_scsw *scsw = &cdev->private->dma_area->irb.scsw.cmd;
        int len = sizeof(struct senseid) - scsw->count;
 
        /* Check for incomplete SENSE ID data. */
        if (len < SENSE_ID_MIN_LEN)
                goto out_restart;
-       if (cdev->private->senseid.cu_type == 0xffff)
+       if (cdev->private->dma_area->senseid.cu_type == 0xffff)
                goto out_restart;
        /* Check for incompatible SENSE ID data. */
-       if (cdev->private->senseid.reserved != 0xff)
+       if (cdev->private->dma_area->senseid.reserved != 0xff)
                return -EOPNOTSUPP;
        /* Check for extended-identification information. */
        if (len > SENSE_ID_BASIC_LEN)
@@ -170,7 +172,7 @@ out_restart:
 static void snsid_callback(struct ccw_device *cdev, void *data, int rc)
 {
        struct ccw_dev_id *id = &cdev->private->dev_id;
-       struct senseid *senseid = &cdev->private->senseid;
+       struct senseid *senseid = &cdev->private->dma_area->senseid;
        int vm = 0;
 
        if (rc && MACHINE_IS_VM) {
@@ -200,7 +202,7 @@ void ccw_device_sense_id_start(struct ccw_device *cdev)
 {
        struct subchannel *sch = to_subchannel(cdev->dev.parent);
        struct ccw_request *req = &cdev->private->req;
-       struct ccw1 *cp = cdev->private->iccws;
+       struct ccw1 *cp = cdev->private->dma_area->iccws;
 
        CIO_TRACE_EVENT(4, "snsid");
        CIO_HEX_EVENT(4, &cdev->private->dev_id, sizeof(cdev->private->dev_id));
@@ -208,7 +210,7 @@ void ccw_device_sense_id_start(struct ccw_device *cdev)
        snsid_init(cdev);
        /* Channel program setup. */
        cp->cmd_code    = CCW_CMD_SENSE_ID;
-       cp->cda         = (u32) (addr_t) &cdev->private->senseid;
+       cp->cda         = (u32) (addr_t) &cdev->private->dma_area->senseid;
        cp->count       = sizeof(struct senseid);
        cp->flags       = CCW_FLAG_SLI;
        /* Request setup. */

diff --git a/drivers/s390/cio/device_ops.c b/drivers/s390/cio/device_ops.c
index 4435ae0b3027046cabcb89deb0f0ed806956fcb1..d722458c592850b140a0a0d04cdb3cda505ffb18 100644 (file)
--- a/drivers/s390/cio/device_ops.c
+++ b/drivers/s390/cio/device_ops.c
@@ -429,8 +429,8 @@ struct ciw *ccw_device_get_ciw(struct ccw_device *cdev, __u32 ct)
        if (cdev->private->flags.esid == 0)
                return NULL;
        for (ciw_cnt = 0; ciw_cnt < MAX_CIWS; ciw_cnt++)
-               if (cdev->private->senseid.ciw[ciw_cnt].ct == ct)
-                       return cdev->private->senseid.ciw + ciw_cnt;
+               if (cdev->private->dma_area->senseid.ciw[ciw_cnt].ct == ct)
+                       return cdev->private->dma_area->senseid.ciw + ciw_cnt;
        return NULL;
 }
 
@@ -699,6 +699,23 @@ void ccw_device_get_schid(struct ccw_device *cdev, struct subchannel_id *schid)
 }
 EXPORT_SYMBOL_GPL(ccw_device_get_schid);
 
+/*
+ * Allocate zeroed dma coherent 31 bit addressable memory using
+ * the subchannels dma pool. Maximal size of allocation supported
+ * is PAGE_SIZE.
+ */
+void *ccw_device_dma_zalloc(struct ccw_device *cdev, size_t size)
+{
+       return cio_gp_dma_zalloc(cdev->private->dma_pool, &cdev->dev, size);
+}
+EXPORT_SYMBOL(ccw_device_dma_zalloc);
+
+void ccw_device_dma_free(struct ccw_device *cdev, void *cpu_addr, size_t size)
+{
+       cio_gp_dma_free(cdev->private->dma_pool, cpu_addr, size);
+}
+EXPORT_SYMBOL(ccw_device_dma_free);
+
 EXPORT_SYMBOL(ccw_device_set_options_mask);
 EXPORT_SYMBOL(ccw_device_set_options);
 EXPORT_SYMBOL(ccw_device_clear_options);

diff --git a/drivers/s390/cio/device_pgid.c b/drivers/s390/cio/device_pgid.c
index d30a3babf176ee5a14a8557303cf9323ec08773f..767a85635a0f7e545e59431070a593ff1e87dc1a 100644 (file)
--- a/drivers/s390/cio/device_pgid.c
+++ b/drivers/s390/cio/device_pgid.c
@@ -57,7 +57,7 @@ out:
 static void nop_build_cp(struct ccw_device *cdev)
 {
        struct ccw_request *req = &cdev->private->req;
-       struct ccw1 *cp = cdev->private->iccws;
+       struct ccw1 *cp = cdev->private->dma_area->iccws;
 
        cp->cmd_code    = CCW_CMD_NOOP;
        cp->cda         = 0;
@@ -134,9 +134,9 @@ err:
 static void spid_build_cp(struct ccw_device *cdev, u8 fn)
 {
        struct ccw_request *req = &cdev->private->req;
-       struct ccw1 *cp = cdev->private->iccws;
+       struct ccw1 *cp = cdev->private->dma_area->iccws;
        int i = pathmask_to_pos(req->lpm);
-       struct pgid *pgid = &cdev->private->pgid[i];
+       struct pgid *pgid = &cdev->private->dma_area->pgid[i];
 
        pgid->inf.fc    = fn;
        cp->cmd_code    = CCW_CMD_SET_PGID;
@@ -300,7 +300,7 @@ static int pgid_cmp(struct pgid *p1, struct pgid *p2)
 static void pgid_analyze(struct ccw_device *cdev, struct pgid **p,
                         int *mismatch, u8 *reserved, u8 *reset)
 {
-       struct pgid *pgid = &cdev->private->pgid[0];
+       struct pgid *pgid = &cdev->private->dma_area->pgid[0];
        struct pgid *first = NULL;
        int lpm;
        int i;
@@ -342,7 +342,7 @@ static u8 pgid_to_donepm(struct ccw_device *cdev)
                lpm = 0x80 >> i;
                if ((cdev->private->pgid_valid_mask & lpm) == 0)
                        continue;
-               pgid = &cdev->private->pgid[i];
+               pgid = &cdev->private->dma_area->pgid[i];
                if (sch->opm & lpm) {
                        if (pgid->inf.ps.state1 != SNID_STATE1_GROUPED)
                                continue;
@@ -368,7 +368,8 @@ static void pgid_fill(struct ccw_device *cdev, struct pgid *pgid)
        int i;
 
        for (i = 0; i < 8; i++)
-               memcpy(&cdev->private->pgid[i], pgid, sizeof(struct pgid));
+               memcpy(&cdev->private->dma_area->pgid[i], pgid,
+                      sizeof(struct pgid));
 }
 
 /*
@@ -435,12 +436,12 @@ out:
 static void snid_build_cp(struct ccw_device *cdev)
 {
        struct ccw_request *req = &cdev->private->req;
-       struct ccw1 *cp = cdev->private->iccws;
+       struct ccw1 *cp = cdev->private->dma_area->iccws;
        int i = pathmask_to_pos(req->lpm);
 
        /* Channel program setup. */
        cp->cmd_code    = CCW_CMD_SENSE_PGID;
-       cp->cda         = (u32) (addr_t) &cdev->private->pgid[i];
+       cp->cda         = (u32) (addr_t) &cdev->private->dma_area->pgid[i];
        cp->count       = sizeof(struct pgid);
        cp->flags       = CCW_FLAG_SLI;
        req->cp         = cp;
@@ -516,7 +517,8 @@ static void verify_start(struct ccw_device *cdev)
        sch->lpm = sch->schib.pmcw.pam;
 
        /* Initialize PGID data. */
-       memset(cdev->private->pgid, 0, sizeof(cdev->private->pgid));
+       memset(cdev->private->dma_area->pgid, 0,
+              sizeof(cdev->private->dma_area->pgid));
        cdev->private->pgid_valid_mask = 0;
        cdev->private->pgid_todo_mask = sch->schib.pmcw.pam;
        cdev->private->path_notoper_mask = 0;
@@ -626,7 +628,7 @@ struct stlck_data {
 static void stlck_build_cp(struct ccw_device *cdev, void *buf1, void *buf2)
 {
        struct ccw_request *req = &cdev->private->req;
-       struct ccw1 *cp = cdev->private->iccws;
+       struct ccw1 *cp = cdev->private->dma_area->iccws;
 
        cp[0].cmd_code = CCW_CMD_STLCK;
        cp[0].cda = (u32) (addr_t) buf1;

diff --git a/drivers/s390/cio/device_status.c b/drivers/s390/cio/device_status.c
index 7d5c7892b2c44981f25a621f878a12bd3dee267f..0bd8f2642732f1e9cedf8d4664a8e902fc221f95 100644 (file)
--- a/drivers/s390/cio/device_status.c
+++ b/drivers/s390/cio/device_status.c
@@ -79,15 +79,15 @@ ccw_device_accumulate_ecw(struct ccw_device *cdev, struct irb *irb)
         * are condition that have to be met for the extended control
         * bit to have meaning. Sick.
         */
-       cdev->private->irb.scsw.cmd.ectl = 0;
+       cdev->private->dma_area->irb.scsw.cmd.ectl = 0;
        if ((irb->scsw.cmd.stctl & SCSW_STCTL_ALERT_STATUS) &&
            !(irb->scsw.cmd.stctl & SCSW_STCTL_INTER_STATUS))
-               cdev->private->irb.scsw.cmd.ectl = irb->scsw.cmd.ectl;
+               cdev->private->dma_area->irb.scsw.cmd.ectl = irb->scsw.cmd.ectl;
        /* Check if extended control word is valid. */
-       if (!cdev->private->irb.scsw.cmd.ectl)
+       if (!cdev->private->dma_area->irb.scsw.cmd.ectl)
                return;
        /* Copy concurrent sense / model dependent information. */
-       memcpy (&cdev->private->irb.ecw, irb->ecw, sizeof (irb->ecw));
+       memcpy(&cdev->private->dma_area->irb.ecw, irb->ecw, sizeof(irb->ecw));
 }
 
 /*
@@ -118,7 +118,7 @@ ccw_device_accumulate_esw(struct ccw_device *cdev, struct irb *irb)
        if (!ccw_device_accumulate_esw_valid(irb))
                return;
 
-       cdev_irb = &cdev->private->irb;
+       cdev_irb = &cdev->private->dma_area->irb;
 
        /* Copy last path used mask. */
        cdev_irb->esw.esw1.lpum = irb->esw.esw1.lpum;
@@ -210,7 +210,7 @@ ccw_device_accumulate_irb(struct ccw_device *cdev, struct irb *irb)
                ccw_device_path_notoper(cdev);
        /* No irb accumulation for transport mode irbs. */
        if (scsw_is_tm(&irb->scsw)) {
-               memcpy(&cdev->private->irb, irb, sizeof(struct irb));
+               memcpy(&cdev->private->dma_area->irb, irb, sizeof(struct irb));
                return;
        }
        /*
@@ -219,7 +219,7 @@ ccw_device_accumulate_irb(struct ccw_device *cdev, struct irb *irb)
        if (!scsw_is_solicited(&irb->scsw))
                return;
 
-       cdev_irb = &cdev->private->irb;
+       cdev_irb = &cdev->private->dma_area->irb;
 
        /*
         * If the clear function had been performed, all formerly pending
@@ -227,7 +227,7 @@ ccw_device_accumulate_irb(struct ccw_device *cdev, struct irb *irb)
         * intermediate accumulated status to the device driver.
         */
        if (irb->scsw.cmd.fctl & SCSW_FCTL_CLEAR_FUNC)
-               memset(&cdev->private->irb, 0, sizeof(struct irb));
+               memset(&cdev->private->dma_area->irb, 0, sizeof(struct irb));
 
        /* Copy bits which are valid only for the start function. */
        if (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) {
@@ -329,9 +329,9 @@ ccw_device_do_sense(struct ccw_device *cdev, struct irb *irb)
        /*
         * We have ending status but no sense information. Do a basic sense.
         */
-       sense_ccw = &to_io_private(sch)->sense_ccw;
+       sense_ccw = &to_io_private(sch)->dma_area->sense_ccw;
        sense_ccw->cmd_code = CCW_CMD_BASIC_SENSE;
-       sense_ccw->cda = (__u32) __pa(cdev->private->irb.ecw);
+       sense_ccw->cda = (__u32) __pa(cdev->private->dma_area->irb.ecw);
        sense_ccw->count = SENSE_MAX_COUNT;
        sense_ccw->flags = CCW_FLAG_SLI;
 
@@ -364,7 +364,7 @@ ccw_device_accumulate_basic_sense(struct ccw_device *cdev, struct irb *irb)
 
        if (!(irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) &&
            (irb->scsw.cmd.dstat & DEV_STAT_CHN_END)) {
-               cdev->private->irb.esw.esw0.erw.cons = 1;
+               cdev->private->dma_area->irb.esw.esw0.erw.cons = 1;
                cdev->private->flags.dosense = 0;
        }
        /* Check if path verification is required. */
@@ -386,7 +386,7 @@ ccw_device_accumulate_and_sense(struct ccw_device *cdev, struct irb *irb)
        /* Check for basic sense. */
        if (cdev->private->flags.dosense &&
            !(irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK)) {
-               cdev->private->irb.esw.esw0.erw.cons = 1;
+               cdev->private->dma_area->irb.esw.esw0.erw.cons = 1;
                cdev->private->flags.dosense = 0;
                return 0;
        }

diff --git a/drivers/s390/cio/io_sch.h b/drivers/s390/cio/io_sch.h
index 90e4e3a7841be1b23e833809587096dc9290f16e..c03b4a19974e80880a52da821898e137f9706b80 100644 (file)
--- a/drivers/s390/cio/io_sch.h
+++ b/drivers/s390/cio/io_sch.h
@@ -9,15 +9,20 @@
 #include "css.h"
 #include "orb.h"
 
+struct io_subchannel_dma_area {
+       struct ccw1 sense_ccw;  /* static ccw for sense command */
+};
+
 struct io_subchannel_private {
        union orb orb;          /* operation request block */
-       struct ccw1 sense_ccw;  /* static ccw for sense command */
        struct ccw_device *cdev;/* pointer to the child ccw device */
        struct {
                unsigned int suspend:1; /* allow suspend */
                unsigned int prefetch:1;/* deny prefetch */
                unsigned int inter:1;   /* suppress intermediate interrupts */
        } __packed options;
+       struct io_subchannel_dma_area *dma_area;
+       dma_addr_t dma_area_dma;
 } __aligned(8);
 
 #define to_io_private(n) ((struct io_subchannel_private *) \
@@ -115,6 +120,13 @@ enum cdev_todo {
 #define FAKE_CMD_IRB   1
 #define FAKE_TM_IRB    2
 
+struct ccw_device_dma_area {
+       struct senseid senseid; /* SenseID info */
+       struct ccw1 iccws[2];   /* ccws for SNID/SID/SPGID commands */
+       struct irb irb;         /* device status */
+       struct pgid pgid[8];    /* path group IDs per chpid*/
+};
+
 struct ccw_device_private {
        struct ccw_device *cdev;
        struct subchannel *sch;
@@ -156,11 +168,7 @@ struct ccw_device_private {
        } __attribute__((packed)) flags;
        unsigned long intparm;  /* user interruption parameter */
        struct qdio_irq *qdio_data;
-       struct irb irb;         /* device status */
        int async_kill_io_rc;
-       struct senseid senseid; /* SenseID info */
-       struct pgid pgid[8];    /* path group IDs per chpid*/
-       struct ccw1 iccws[2];   /* ccws for SNID/SID/SPGID commands */
        struct work_struct todo_work;
        enum cdev_todo todo;
        wait_queue_head_t wait_q;
@@ -169,6 +177,8 @@ struct ccw_device_private {
        struct list_head cmb_list;      /* list of measured devices */
        u64 cmb_start_time;             /* clock value of cmb reset */
        void *cmb_wait;                 /* deferred cmb enable/disable */
+       struct gen_pool *dma_pool;
+       struct ccw_device_dma_area *dma_area;
        enum interruption_class int_class;
 };
 

diff --git a/drivers/s390/virtio/virtio_ccw.c b/drivers/s390/virtio/virtio_ccw.c
index 6a30768813219fd7a28c597c27dcf8ecb6717dde..f995798bb025431b9eede000a337e635b986c802 100644 (file)
--- a/drivers/s390/virtio/virtio_ccw.c
+++ b/drivers/s390/virtio/virtio_ccw.c
@@ -66,7 +66,6 @@ struct virtio_ccw_device {
        bool device_lost;
        unsigned int config_ready;
        void *airq_info;
-       u64 dma_mask;
 };
 
 struct vq_info_block_legacy {
@@ -1255,16 +1254,7 @@ static int virtio_ccw_online(struct ccw_device *cdev)
                ret = -ENOMEM;
                goto out_free;
        }
-
        vcdev->vdev.dev.parent = &cdev->dev;
-       cdev->dev.dma_mask = &vcdev->dma_mask;
-       /* we are fine with common virtio infrastructure using 64 bit DMA */
-       ret = dma_set_mask_and_coherent(&cdev->dev, DMA_BIT_MASK(64));
-       if (ret) {
-               dev_warn(&cdev->dev, "Failed to enable 64-bit DMA.\n");
-               goto out_free;
-       }
-
        vcdev->config_block = kzalloc(sizeof(*vcdev->config_block),
                                   GFP_DMA | GFP_KERNEL);
        if (!vcdev->config_block) {