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authorPetr Tesarik <ptesarik@suse.cz>2019-07-18 11:02:34 +0200
committerPetr Tesarik <ptesarik@suse.cz>2019-07-19 14:09:51 +0200
commit3df0a1d662c7c03e52ddf921ba45d671286a17f9 (patch)
tree41ae942b55720c383e7b435b50f35d339877faf6
parent974d45949adfcd799268c0935e15f162da818982 (diff)
virtio/s390: make airq summary indicators DMA (jsc#SLE-6197
FATE#327012 bsc#1140559 LTC#173150). suse-commit: eecf2f8f3856f7006e03403510365e256a45e7fa
-rw-r--r--drivers/s390/virtio/virtio_ccw.c32
1 files changed, 24 insertions, 8 deletions
diff --git a/drivers/s390/virtio/virtio_ccw.c b/drivers/s390/virtio/virtio_ccw.c
index 154f166ed52a..47b64c08fff5 100644
--- a/drivers/s390/virtio/virtio_ccw.c
+++ b/drivers/s390/virtio/virtio_ccw.c
@@ -143,11 +143,17 @@ 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
@@ -212,7 +218,7 @@ 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;;) {
@@ -224,7 +230,7 @@ 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;
@@ -240,7 +246,8 @@ 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);
@@ -262,7 +269,7 @@ 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;
@@ -348,7 +355,7 @@ 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);
@@ -616,7 +623,7 @@ 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;
@@ -1443,8 +1450,17 @@ 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);