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pc-bios/s390-ccw: Add code for virtio feature negotiation 

The upcoming virtio-net driver needs to negotiate some features,
so we need the possibility to do this in the core virtio code.

Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-Id: <1499863793-18627-8-git-send-email-thuth@redhat.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Thomas Huth 2017-07-12 14:49:49 +02:00 committed by Christian Borntraeger
parent ac7bec7cf9
commit 59efbff1cb
3 changed files with 20 additions and 6 deletions
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2
pc-bios/s390-ccw/s390-ccw.h
View File

@ -44,6 +44,8 @@ typedef unsigned long long __u64;
((b) == 0 ? (a) : (MIN(a, b))))
#endif
#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
#include "cio.h"
#include "iplb.h"

23
pc-bios/s390-ccw/virtio.c
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@ -12,6 +12,7 @@
#include "s390-ccw.h"
#include "virtio.h"
#include "virtio-scsi.h"
#include "bswap.h"
#define VRING_WAIT_REPLY_TIMEOUT 3
@ -249,8 +250,12 @@ int virtio_run(VDev *vdev, int vqid, VirtioCmd *cmd)
void virtio_setup_ccw(VDev *vdev)
{
int i, cfg_size = 0;
int i, rc, cfg_size = 0;
unsigned char status = VIRTIO_CONFIG_S_DRIVER_OK;
struct VirtioFeatureDesc {
uint32_t features;
uint8_t index;
} __attribute__((packed)) feats;
IPL_assert(virtio_is_supported(vdev->schid), "PE");
/* device ID has been established now */
@ -277,11 +282,17 @@ void virtio_setup_ccw(VDev *vdev)
IPL_assert(run_ccw(vdev, CCW_CMD_READ_CONF, &vdev->config, cfg_size) == 0,
"Could not get block device configuration");
/*
* Skipping CCW_CMD_READ_FEAT. We're not doing anything fancy, and
* we'll just stop dead anyway if anything does not work like we
* expect it.
*/
/* 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));
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));
IPL_assert(rc == 0, "Could not set features bits");
}
for (i = 0; i < vdev->nr_vqs; i++) {
VqInfo info = {

1
pc-bios/s390-ccw/virtio.h
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@ -251,6 +251,7 @@ struct VDev {
ScsiDevice selected_scsi_device;
uint64_t netboot_start_addr;
uint32_t max_transfer;
uint32_t guest_features[2];
};
typedef struct VDev VDev;