Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / seabios / src / hw / virtio-blk.c

diff --git a/qemu/roms/seabios/src/hw/virtio-blk.c b/qemu/roms/seabios/src/hw/virtio-blk.c
new file mode 100644 (file)
index 0000000..e2dbd3c
--- /dev/null
+++ b/qemu/roms/seabios/src/hw/virtio-blk.c
@@ -0,0 +1,177 @@
+// Virtio block boot support.
+//
+// Copyright (C) 2010 Red Hat Inc.
+//
+// Authors:
+//  Gleb Natapov <gnatapov@redhat.com>
+//
+// This file may be distributed under the terms of the GNU LGPLv3 license.
+
+#include "biosvar.h" // GET_GLOBALFLAT
+#include "config.h" // CONFIG_*
+#include "block.h" // struct drive_s
+#include "malloc.h" // free
+#include "output.h" // dprintf
+#include "pci.h" // foreachpci
+#include "pci_ids.h" // PCI_DEVICE_ID_VIRTIO_BLK
+#include "pci_regs.h" // PCI_VENDOR_ID
+#include "std/disk.h" // DISK_RET_SUCCESS
+#include "string.h" // memset
+#include "util.h" // usleep
+#include "virtio-pci.h"
+#include "virtio-ring.h"
+#include "virtio-blk.h"
+
+struct virtiodrive_s {
+    struct drive_s drive;
+    struct vring_virtqueue *vq;
+    u16 ioaddr;
+};
+
+static int
+virtio_blk_op(struct disk_op_s *op, int write)
+{
+    struct virtiodrive_s *vdrive_gf =
+        container_of(op->drive_gf, struct virtiodrive_s, drive);
+    struct vring_virtqueue *vq = GET_GLOBALFLAT(vdrive_gf->vq);
+    struct virtio_blk_outhdr hdr = {
+        .type = write ? VIRTIO_BLK_T_OUT : VIRTIO_BLK_T_IN,
+        .ioprio = 0,
+        .sector = op->lba,
+    };
+    u8 status = VIRTIO_BLK_S_UNSUPP;
+    struct vring_list sg[] = {
+        {
+            .addr       = MAKE_FLATPTR(GET_SEG(SS), &hdr),
+            .length     = sizeof(hdr),
+        },
+        {
+            .addr       = op->buf_fl,
+            .length     = GET_GLOBALFLAT(vdrive_gf->drive.blksize) * op->count,
+        },
+        {
+            .addr       = MAKE_FLATPTR(GET_SEG(SS), &status),
+            .length     = sizeof(status),
+        },
+    };
+
+    /* Add to virtqueue and kick host */
+    if (write)
+        vring_add_buf(vq, sg, 2, 1, 0, 0);
+    else
+        vring_add_buf(vq, sg, 1, 2, 0, 0);
+    vring_kick(GET_GLOBALFLAT(vdrive_gf->ioaddr), vq, 1);
+
+    /* Wait for reply */
+    while (!vring_more_used(vq))
+        usleep(5);
+
+    /* Reclaim virtqueue element */
+    vring_get_buf(vq, NULL);
+
+    /* Clear interrupt status register.  Avoid leaving interrupts stuck if
+     * VRING_AVAIL_F_NO_INTERRUPT was ignored and interrupts were raised.
+     */
+    vp_get_isr(GET_GLOBALFLAT(vdrive_gf->ioaddr));
+
+    return status == VIRTIO_BLK_S_OK ? DISK_RET_SUCCESS : DISK_RET_EBADTRACK;
+}
+
+int
+process_virtio_blk_op(struct disk_op_s *op)
+{
+    if (! CONFIG_VIRTIO_BLK)
+        return 0;
+    switch (op->command) {
+    case CMD_READ:
+        return virtio_blk_op(op, 0);
+    case CMD_WRITE:
+        return virtio_blk_op(op, 1);
+    case CMD_FORMAT:
+    case CMD_RESET:
+    case CMD_ISREADY:
+    case CMD_VERIFY:
+    case CMD_SEEK:
+        return DISK_RET_SUCCESS;
+    default:
+        return DISK_RET_EPARAM;
+    }
+}
+
+static void
+init_virtio_blk(struct pci_device *pci)
+{
+    u16 bdf = pci->bdf;
+    dprintf(1, "found virtio-blk at %x:%x\n", pci_bdf_to_bus(bdf),
+            pci_bdf_to_dev(bdf));
+    struct virtiodrive_s *vdrive = malloc_fseg(sizeof(*vdrive));
+    if (!vdrive) {
+        warn_noalloc();
+        return;
+    }
+    memset(vdrive, 0, sizeof(*vdrive));
+    vdrive->drive.type = DTYPE_VIRTIO_BLK;
+    vdrive->drive.cntl_id = bdf;
+
+    u16 ioaddr = vp_init_simple(bdf);
+    vdrive->ioaddr = ioaddr;
+    if (vp_find_vq(ioaddr, 0, &vdrive->vq) < 0 ) {
+        dprintf(1, "fail to find vq for virtio-blk %x:%x\n",
+                pci_bdf_to_bus(bdf), pci_bdf_to_dev(bdf));
+        goto fail;
+    }
+
+    struct virtio_blk_config cfg;
+    vp_get(ioaddr, 0, &cfg, sizeof(cfg));
+
+    u32 f = vp_get_features(ioaddr);
+    vdrive->drive.blksize = (f & (1 << VIRTIO_BLK_F_BLK_SIZE)) ?
+        cfg.blk_size : DISK_SECTOR_SIZE;
+
+    vdrive->drive.sectors = cfg.capacity;
+    dprintf(3, "virtio-blk %x:%x blksize=%d sectors=%u\n",
+            pci_bdf_to_bus(bdf), pci_bdf_to_dev(bdf),
+            vdrive->drive.blksize, (u32)vdrive->drive.sectors);
+
+    if (vdrive->drive.blksize != DISK_SECTOR_SIZE) {
+        dprintf(1, "virtio-blk %x:%x block size %d is unsupported\n",
+                pci_bdf_to_bus(bdf), pci_bdf_to_dev(bdf),
+                vdrive->drive.blksize);
+        goto fail;
+    }
+
+    vdrive->drive.pchs.cylinder = cfg.cylinders;
+    vdrive->drive.pchs.head = cfg.heads;
+    vdrive->drive.pchs.sector = cfg.sectors;
+    char *desc = znprintf(MAXDESCSIZE, "Virtio disk PCI:%x:%x",
+                          pci_bdf_to_bus(bdf), pci_bdf_to_dev(bdf));
+
+    boot_add_hd(&vdrive->drive, desc, bootprio_find_pci_device(pci));
+
+    vp_set_status(ioaddr, VIRTIO_CONFIG_S_ACKNOWLEDGE |
+                  VIRTIO_CONFIG_S_DRIVER | VIRTIO_CONFIG_S_DRIVER_OK);
+    return;
+
+fail:
+    vp_reset(ioaddr);
+    free(vdrive->vq);
+    free(vdrive);
+}
+
+void
+virtio_blk_setup(void)
+{
+    ASSERT32FLAT();
+    if (! CONFIG_VIRTIO_BLK)
+        return;
+
+    dprintf(3, "init virtio-blk\n");
+
+    struct pci_device *pci;
+    foreachpci(pci) {
+        if (pci->vendor != PCI_VENDOR_ID_REDHAT_QUMRANET
+            || pci->device != PCI_DEVICE_ID_VIRTIO_BLK)
+            continue;
+        init_virtio_blk(pci);
+    }
+}