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Diffstat (limited to 'pc-bios/s390-ccw/virtio.c')
-rw-r--r--pc-bios/s390-ccw/virtio.c57
1 files changed, 27 insertions, 30 deletions
diff --git a/pc-bios/s390-ccw/virtio.c b/pc-bios/s390-ccw/virtio.c
index aa9da7253f..35278eaee1 100644
--- a/pc-bios/s390-ccw/virtio.c
+++ b/pc-bios/s390-ccw/virtio.c
@@ -14,6 +14,7 @@
#include "virtio.h"
#include "virtio-scsi.h"
#include "bswap.h"
+#include "helper.h"
#define VRING_WAIT_REPLY_TIMEOUT 30
@@ -89,33 +90,20 @@ int drain_irqs(SubChannelId schid)
}
}
-static int run_ccw(VDev *vdev, int cmd, void *ptr, int len)
+static int run_ccw(VDev *vdev, int cmd, void *ptr, int len, bool sli)
{
Ccw1 ccw = {};
- CmdOrb orb = {};
- int r;
-
- enable_subchannel(vdev->schid);
-
- /* start subchannel command */
- orb.fmt = 1;
- orb.cpa = (u32)(long)&ccw;
- orb.lpm = 0x80;
ccw.cmd_code = cmd;
ccw.cda = (long)ptr;
ccw.count = len;
- r = ssch(vdev->schid, &orb);
- /*
- * XXX Wait until device is done processing the CCW. For now we can
- * assume that a simple tsch will have finished the CCW processing,
- * but the architecture allows for asynchronous operation
- */
- if (!r) {
- r = drain_irqs(vdev->schid);
+ if (sli) {
+ ccw.flags |= CCW_FLAG_SLI;
}
- return r;
+
+ enable_subchannel(vdev->schid);
+ return do_cio(vdev->schid, vdev->senseid.cu_type, ptr2u32(&ccw), CCW_FMT1);
}
static void vring_init(VRing *vr, VqInfo *info)
@@ -257,7 +245,7 @@ void virtio_setup_ccw(VDev *vdev)
vdev->config.blk.blk_size = 0; /* mark "illegal" - setup started... */
vdev->guessed_disk_nature = VIRTIO_GDN_NONE;
- run_ccw(vdev, CCW_CMD_VDEV_RESET, NULL, 0);
+ run_ccw(vdev, CCW_CMD_VDEV_RESET, NULL, 0, false);
switch (vdev->senseid.cu_model) {
case VIRTIO_ID_NET:
@@ -278,18 +266,19 @@ void virtio_setup_ccw(VDev *vdev)
default:
panic("Unsupported virtio device\n");
}
- IPL_assert(run_ccw(vdev, CCW_CMD_READ_CONF, &vdev->config, cfg_size) == 0,
- "Could not get block device configuration");
+ IPL_assert(
+ run_ccw(vdev, CCW_CMD_READ_CONF, &vdev->config, cfg_size, false) == 0,
+ "Could not get block device configuration");
/* Feature negotiation */
for (i = 0; i < ARRAY_SIZE(vdev->guest_features); i++) {
feats.features = 0;
feats.index = i;
- rc = run_ccw(vdev, CCW_CMD_READ_FEAT, &feats, sizeof(feats));
+ rc = run_ccw(vdev, CCW_CMD_READ_FEAT, &feats, sizeof(feats), false);
IPL_assert(rc == 0, "Could not get features bits");
vdev->guest_features[i] &= bswap32(feats.features);
feats.features = bswap32(vdev->guest_features[i]);
- rc = run_ccw(vdev, CCW_CMD_WRITE_FEAT, &feats, sizeof(feats));
+ rc = run_ccw(vdev, CCW_CMD_WRITE_FEAT, &feats, sizeof(feats), false);
IPL_assert(rc == 0, "Could not set features bits");
}
@@ -306,16 +295,17 @@ void virtio_setup_ccw(VDev *vdev)
};
IPL_assert(
- run_ccw(vdev, CCW_CMD_READ_VQ_CONF, &config, sizeof(config)) == 0,
+ run_ccw(vdev, CCW_CMD_READ_VQ_CONF, &config, sizeof(config), false) == 0,
"Could not get block device VQ configuration");
info.num = config.num;
vring_init(&vdev->vrings[i], &info);
vdev->vrings[i].schid = vdev->schid;
- IPL_assert(run_ccw(vdev, CCW_CMD_SET_VQ, &info, sizeof(info)) == 0,
- "Cannot set VQ info");
+ IPL_assert(
+ run_ccw(vdev, CCW_CMD_SET_VQ, &info, sizeof(info), false) == 0,
+ "Cannot set VQ info");
}
IPL_assert(
- run_ccw(vdev, CCW_CMD_WRITE_STATUS, &status, sizeof(status)) == 0,
+ run_ccw(vdev, CCW_CMD_WRITE_STATUS, &status, sizeof(status), false) == 0,
"Could not write status to host");
}
@@ -323,8 +313,15 @@ bool virtio_is_supported(SubChannelId schid)
{
vdev.schid = schid;
memset(&vdev.senseid, 0, sizeof(vdev.senseid));
- /* run sense id command */
- if (run_ccw(&vdev, CCW_CMD_SENSE_ID, &vdev.senseid, sizeof(vdev.senseid))) {
+
+ /*
+ * Run sense id command.
+ * The size of the senseid data differs between devices (notably,
+ * between virtio devices and dasds), so specify the largest possible
+ * size and suppress the incorrect length indication for smaller sizes.
+ */
+ if (run_ccw(&vdev, CCW_CMD_SENSE_ID, &vdev.senseid, sizeof(vdev.senseid),
+ true)) {
return false;
}
if (vdev.senseid.cu_type == 0x3832) {