virtio/s390: make airq summary indicators DMA

The hypervisor needs to interact with the summary indicators, so these
need to be DMA memory as well (at least for protected virtualization
guests).

Signed-off-by: Halil Pasic <pasic@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/drivers/s390/virtio/virtio_ccw.c b/drivers/s390/virtio/virtio_ccw.c
index 8002529..1a55e59 100644 (file)
--- a/drivers/s390/virtio/virtio_ccw.c
+++ b/drivers/s390/virtio/virtio_ccw.c
@@ -140,11 +140,17 @@ static int virtio_ccw_use_airq = 1;
 
 struct airq_info {
        rwlock_t lock;
-       u8 summary_indicator;
+       u8 summary_indicator_idx;
        struct airq_struct airq;
        struct airq_iv *aiv;
 };
 static struct airq_info *airq_areas[MAX_AIRQ_AREAS];
+static u8 *summary_indicators;
+
+static inline u8 *get_summary_indicator(struct airq_info *info)
+{
+       return summary_indicators + info->summary_indicator_idx;
+}
 
 #define CCW_CMD_SET_VQ 0x13
 #define CCW_CMD_VDEV_RESET 0x33
@@ -209,7 +215,7 @@ static void virtio_airq_handler(struct airq_struct *airq, bool floating)
                        break;
                vring_interrupt(0, (void *)airq_iv_get_ptr(info->aiv, ai));
        }
-       info->summary_indicator = 0;
+       *(get_summary_indicator(info)) = 0;
        smp_wmb();
        /* Walk through indicators field, summary indicator not active. */
        for (ai = 0;;) {
@@ -221,7 +227,7 @@ static void virtio_airq_handler(struct airq_struct *airq, bool floating)
        read_unlock(&info->lock);
 }
 
-static struct airq_info *new_airq_info(void)
+static struct airq_info *new_airq_info(int index)
 {
        struct airq_info *info;
        int rc;
@@ -237,7 +243,8 @@ static struct airq_info *new_airq_info(void)
                return NULL;
        }
        info->airq.handler = virtio_airq_handler;
-       info->airq.lsi_ptr = &info->summary_indicator;
+       info->summary_indicator_idx = index;
+       info->airq.lsi_ptr = get_summary_indicator(info);
        info->airq.lsi_mask = 0xff;
        info->airq.isc = VIRTIO_AIRQ_ISC;
        rc = register_adapter_interrupt(&info->airq);
@@ -259,7 +266,7 @@ static unsigned long get_airq_indicator(struct virtqueue *vqs[], int nvqs,
 
        for (i = 0; i < MAX_AIRQ_AREAS && !indicator_addr; i++) {
                if (!airq_areas[i])
-                       airq_areas[i] = new_airq_info();
+                       airq_areas[i] = new_airq_info(i);
                info = airq_areas[i];
                if (!info)
                        return 0;
@@ -345,7 +352,7 @@ static void virtio_ccw_drop_indicator(struct virtio_ccw_device *vcdev,
                if (!thinint_area)
                        return;
                thinint_area->summary_indicator =
-                       (unsigned long) &airq_info->summary_indicator;
+                       (unsigned long) get_summary_indicator(airq_info);
                thinint_area->isc = VIRTIO_AIRQ_ISC;
                ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER;
                ccw->count = sizeof(*thinint_area);
@@ -613,7 +620,7 @@ static int virtio_ccw_register_adapter_ind(struct virtio_ccw_device *vcdev,
        }
        info = vcdev->airq_info;
        thinint_area->summary_indicator =
-               (unsigned long) &info->summary_indicator;
+               (unsigned long) get_summary_indicator(info);
        thinint_area->isc = VIRTIO_AIRQ_ISC;
        ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER;
        ccw->flags = CCW_FLAG_SLI;
@@ -1493,8 +1500,17 @@ static void __init no_auto_parse(void)
 
 static int __init virtio_ccw_init(void)
 {
+       int rc;
+
        /* parse no_auto string before we do anything further */
        no_auto_parse();
-       return ccw_driver_register(&virtio_ccw_driver);
+
+       summary_indicators = cio_dma_zalloc(MAX_AIRQ_AREAS);
+       if (!summary_indicators)
+               return -ENOMEM;
+       rc = ccw_driver_register(&virtio_ccw_driver);
+       if (rc)
+               cio_dma_free(summary_indicators, MAX_AIRQ_AREAS);
+       return rc;
 }
 device_initcall(virtio_ccw_init);