[PULL 29/33] pc-bios/s390-ccw: Add support for virtio-scsi-pci IPL

[Eric Farman <farman@linux.ibm.com>]

From: Jared Rossi <jrossi@linux.ibm.com>

Read virtio-pci configuration and configure virt-queue for scsi devices.

Also add check for virtio setup failures when doing scsi setup and return
early if it fails instead of waiting for subsequent failure.

Signed-off-by: Jared Rossi <jrossi@linux.ibm.com>
Reviewed-by: Jason J. Herne <jjherne@linux.ibm.com>
Reviewed-by: Eric Farman <farman@linux.ibm.com>
Link: https://lore.kernel.org/qemu-devel/20260831194919.3830270-7-jrossi@linux.ibm.com
Signed-off-by: Eric Farman <farman@linux.ibm.com>
---
 pc-bios/s390-ccw/main.c        |  3 ++-
 pc-bios/s390-ccw/virtio-pci.c  | 30 ++++++++++++++++++++++++++++++
 pc-bios/s390-ccw/virtio-scsi.c | 18 +++++++++++++++++-
 3 files changed, 49 insertions(+), 2 deletions(-)

diff --git a/pc-bios/s390-ccw/main.c b/pc-bios/s390-ccw/main.c
index 6ab2b8f75b..a2a24b024f 100644
--- a/pc-bios/s390-ccw/main.c
+++ b/pc-bios/s390-ccw/main.c
@@ -273,6 +273,7 @@ static bool find_boot_device(void)
         }
         break;
      case S390_IPL_TYPE_PCI:
+        vdev->scsi_device_selected = false;
         found = find_fid(iplb->pci.fid);
         break;
     default:
@@ -333,13 +334,13 @@ static void ipl_pci_device(void)
 {
     VDev *vdev = virtio_get_device();
     vdev->is_cdrom = false;
-    vdev->scsi_device_selected = false;
 
     if (virtio_pci_setup_device()) {
         return;
     }
 
     switch (vdev->dev_type) {
+    case VIRTIO_ID_SCSI:
     case VIRTIO_ID_BLOCK:
         if (virtio_setup() == 0) {
             zipl_load(); /* only return on error */
diff --git a/pc-bios/s390-ccw/virtio-pci.c b/pc-bios/s390-ccw/virtio-pci.c
index 231ab6e04d..277c3ea68d 100644
--- a/pc-bios/s390-ccw/virtio-pci.c
+++ b/pc-bios/s390-ccw/virtio-pci.c
@@ -52,6 +52,10 @@ void virtio_pci_id2type(VDev *vdev, uint16_t device_id)
     case 0x1001:
         vdev->dev_type = VIRTIO_ID_BLOCK;
         break;
+    case 0x1048:
+    case 0x1004:
+        vdev->dev_type = VIRTIO_ID_SCSI;
+        break;
     default:
         vdev->dev_type = 0;
     }
@@ -199,6 +203,26 @@ static int virtio_pci_get_blk_config(void)
     return rc;
 }
 
+static int virtio_pci_get_scsi_config(void)
+{
+    VirtioScsiConfig *cfg = &virtio_get_device()->config.scsi;
+    int rc = vpci_read_flex(d_cap.off, d_cap.bar, cfg, sizeof(VirtioScsiConfig));
+
+    /* all fields of scsi config must be byte swapped */
+    cfg->num_queues = bswap32(cfg->num_queues);
+    cfg->seg_max = bswap32(cfg->seg_max);
+    cfg->max_sectors = bswap32(cfg->max_sectors);
+    cfg->cmd_per_lun = bswap32(cfg->cmd_per_lun);
+    cfg->event_info_size = bswap32(cfg->event_info_size);
+    cfg->sense_size = bswap32(cfg->sense_size);
+    cfg->cdb_size = bswap32(cfg->cdb_size);
+    cfg->max_channel = bswap16(cfg->max_channel);
+    cfg->max_target = bswap16(cfg->max_target);
+    cfg->max_lun = bswap32(cfg->max_lun);
+
+    return rc;
+}
+
 static int virtio_pci_negotiate(void)
 {
     int i, rc;
@@ -330,6 +354,7 @@ bool virtio_pci_is_supported(VDev *vdev)
     if (vdev->vendor_id == PCI_VENDOR_VIRTIO) {
         switch (vdev->dev_type) {
         case VIRTIO_ID_BLOCK:
+        case VIRTIO_ID_SCSI:
             return true;
         default:
             return false;
@@ -384,6 +409,11 @@ int virtio_pci_setup(VDev *vdev)
         vdev->cmd_vr_idx = 0;
         virtio_pci_get_blk_config();
         break;
+    case VIRTIO_ID_SCSI:
+        vdev->nr_vqs = 3;
+        vdev->cmd_vr_idx = 2;
+        virtio_pci_get_scsi_config();
+        break;
     default:
         puts("Unsupported virtio device");
         return -ENODEV;
diff --git a/pc-bios/s390-ccw/virtio-scsi.c b/pc-bios/s390-ccw/virtio-scsi.c
index 9ea00c6fe6..ca02ff5989 100644
--- a/pc-bios/s390-ccw/virtio-scsi.c
+++ b/pc-bios/s390-ccw/virtio-scsi.c
@@ -16,6 +16,7 @@
 #include "scsi.h"
 #include "virtio-scsi.h"
 #include "virtio-ccw.h"
+#include "virtio-pci.h"
 #include "s390-time.h"
 #include "helper.h"
 
@@ -479,7 +480,22 @@ static int virtio_scsi_setup(VDev *vdev)
 
 int virtio_scsi_setup_device(VDev *vdev)
 {
-    virtio_ccw_setup(vdev);
+    switch (vdev->ipl_type) {
+    case S390_IPL_TYPE_CCW:
+        if (virtio_ccw_setup(vdev)) {
+            puts("Setup failed for virtio-scsi-ccw");
+            return 1;
+        }
+        break;
+    case S390_IPL_TYPE_PCI:
+        if (virtio_pci_setup(vdev)) {
+            puts("Setup failed for virtio-scsi-pci");
+            return 1;
+        }
+        break;
+    default:
+        return 1;
+    }
 
     if (vdev->config.scsi.sense_size != VIRTIO_SCSI_SENSE_SIZE) {
         puts("Config: sense size mismatch");
-- 
2.55.0