diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/s390/virtio/virtio_ccw.c | 32 |
1 files changed, 24 insertions, 8 deletions
diff --git a/drivers/s390/virtio/virtio_ccw.c b/drivers/s390/virtio/virtio_ccw.c index 800252955a2f..1a55e5942d36 100644 --- 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); |