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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>
This commit is contained in:
Halil Pasic 2019-03-26 19:03:47 +01:00 committed by Heiko Carstens
parent 48720ba568
commit 39c7dcb158
1 changed files with 24 additions and 8 deletions
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32
drivers/s390/virtio/virtio_ccw.c
View File

@ -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);