Merge remote-tracking branch 'bonzini/scsi-next' into staging

* bonzini/scsi-next:
  virtio-scsi: use dma_context_memory
  dma: Define dma_context_memory and use in sysbus-ohci
  megasas: Correct target/lun mapping
  scsi-disk: flush cache after disabling it
  megasas: do not include block_int.h
  scsi: remove superfluous call to scsi_device_set_ua
  virtio-scsi: factor checks for VIRTIO_SCSI_S_DRIVER_OK when reporting events
  scsi: do not return short responses for emulated commands

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

7 files changed, 46 insertions, 24 deletions

diff --git a/dma.h b/dma.h
index 91ccdb5eac..eedf878383 100644
--- a/dma.h
+++ b/dma.h
@@ -68,6 +68,11 @@ struct DMAContext {
     DMAUnmapFunc *unmap;
 };
 
+/* A global DMA context corresponding to the address_space_memory
+ * AddressSpace, for sysbus devices which do DMA.
+ */
+extern DMAContext dma_context_memory;
+
 static inline void dma_barrier(DMAContext *dma, DMADirection dir)
 {
     /*
diff --git a/exec.c b/exec.c
index af94f9cd86..8435de0bd2 100644
--- a/exec.c
+++ b/exec.c
@@ -34,6 +34,7 @@
 #include "hw/xen.h"
 #include "qemu-timer.h"
 #include "memory.h"
+#include "dma.h"
 #include "exec-memory.h"
 #if defined(CONFIG_USER_ONLY)
 #include <qemu.h>
@@ -103,6 +104,7 @@ static MemoryRegion *system_io;
 
 AddressSpace address_space_io;
 AddressSpace address_space_memory;
+DMAContext dma_context_memory;
 
 MemoryRegion io_mem_ram, io_mem_rom, io_mem_unassigned, io_mem_notdirty;
 static MemoryRegion io_mem_subpage_ram;
@@ -3294,6 +3296,9 @@ static void memory_map_init(void)
     memory_listener_register(&core_memory_listener, &address_space_memory);
     memory_listener_register(&io_memory_listener, &address_space_io);
     memory_listener_register(&tcg_memory_listener, &address_space_memory);
+
+    dma_context_init(&dma_context_memory, &address_space_memory,
+                     NULL, NULL, NULL);
 }
 
 MemoryRegion *get_system_memory(void)
diff --git a/hw/megasas.c b/hw/megasas.c
index 7a2036eb76..291ff40403 100644
--- a/hw/megasas.c
+++ b/hw/megasas.c
@@ -25,7 +25,6 @@
 #include "iov.h"
 #include "scsi.h"
 #include "scsi-defs.h"
-#include "block_int.h"
 #include "trace.h"
 
 #include "mfi.h"
@@ -1080,6 +1079,7 @@ static int megasas_dcmd_ld_get_list(MegasasState *s, MegasasCmd *cmd)
         /* Logical device size is in blocks */
         bdrv_get_geometry(conf->bs, &ld_size);
         info.ld_list[num_ld_disks].ld.v.target_id = sdev->id;
+        info.ld_list[num_ld_disks].ld.v.lun_id = sdev->lun;
         info.ld_list[num_ld_disks].state = MFI_LD_STATE_OPTIMAL;
         info.ld_list[num_ld_disks].size = cpu_to_le64(ld_size);
         num_ld_disks++;
diff --git a/hw/mfi.h b/hw/mfi.h
index 436b6906b1..cd8355badf 100644
--- a/hw/mfi.h
+++ b/hw/mfi.h
@@ -1085,7 +1085,7 @@ struct mfi_pd_list {
 union mfi_ld_ref {
     struct {
         uint8_t target_id;
-        uint8_t reserved;
+        uint8_t lun_id;
         uint16_t seq;
     } v;
     uint32_t ref;
diff --git a/hw/scsi-disk.c b/hw/scsi-disk.c
index 1b0afa6352..49b5686a92 100644
--- a/hw/scsi-disk.c
+++ b/hw/scsi-disk.c
@@ -652,7 +652,6 @@ static int scsi_disk_emulate_inquiry(SCSIRequest *req, uint8_t *outbuf)
     if (buflen > SCSI_MAX_INQUIRY_LEN) {
         buflen = SCSI_MAX_INQUIRY_LEN;
     }
-    memset(outbuf, 0, buflen);
 
     outbuf[0] = s->qdev.type & 0x1f;
     outbuf[1] = (s->features & (1 << SCSI_DISK_F_REMOVABLE)) ? 0x80 : 0;
@@ -1388,6 +1387,7 @@ invalid_param_len:
 
 static void scsi_disk_emulate_mode_select(SCSIDiskReq *r, uint8_t *inbuf)
 {
+    SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, r->req.dev);
     uint8_t *p = inbuf;
     int cmd = r->req.cmd.buf[0];
     int len = r->req.cmd.xfer;
@@ -1424,6 +1424,14 @@ static void scsi_disk_emulate_mode_select(SCSIDiskReq *r, uint8_t *inbuf)
             return;
         }
     }
+    if (!bdrv_enable_write_cache(s->qdev.conf.bs)) {
+        /* The request is used as the AIO opaque value, so add a ref.  */
+        scsi_req_ref(&r->req);
+        bdrv_acct_start(s->qdev.conf.bs, &r->acct, 0, BDRV_ACCT_FLUSH);
+        r->req.aiocb = bdrv_aio_flush(s->qdev.conf.bs, scsi_aio_complete, r);
+        return;
+    }
+
     scsi_req_complete(&r->req, GOOD);
     return;
 
@@ -1596,24 +1604,26 @@ static int32_t scsi_disk_emulate_command(SCSIRequest *req, uint8_t *buf)
         break;
     }
 
+    /*
+     * FIXME: we shouldn't return anything bigger than 4k, but the code
+     * requires the buffer to be as big as req->cmd.xfer in several
+     * places.  So, do not allow CDBs with a very large ALLOCATION
+     * LENGTH.  The real fix would be to modify scsi_read_data and
+     * dma_buf_read, so that they return data beyond the buflen
+     * as all zeros.
+     */
+    if (req->cmd.xfer > 65536) {
+        goto illegal_request;
+    }
+    r->buflen = MAX(4096, req->cmd.xfer);
+
     if (!r->iov.iov_base) {
-        /*
-         * FIXME: we shouldn't return anything bigger than 4k, but the code
-         * requires the buffer to be as big as req->cmd.xfer in several
-         * places.  So, do not allow CDBs with a very large ALLOCATION
-         * LENGTH.  The real fix would be to modify scsi_read_data and
-         * dma_buf_read, so that they return data beyond the buflen
-         * as all zeros.
-         */
-        if (req->cmd.xfer > 65536) {
-            goto illegal_request;
-        }
-        r->buflen = MAX(4096, req->cmd.xfer);
         r->iov.iov_base = qemu_blockalign(s->qdev.conf.bs, r->buflen);
     }
 
     buflen = req->cmd.xfer;
     outbuf = r->iov.iov_base;
+    memset(outbuf, 0, r->buflen);
     switch (req->cmd.buf[0]) {
     case TEST_UNIT_READY:
         assert(!s->tray_open && bdrv_is_inserted(s->qdev.conf.bs));
@@ -1694,12 +1704,14 @@ static int32_t scsi_disk_emulate_command(SCSIRequest *req, uint8_t *buf)
         outbuf[5] = 0;
         outbuf[6] = s->qdev.blocksize >> 8;
         outbuf[7] = 0;
-        buflen = 8;
         break;
     case REQUEST_SENSE:
         /* Just return "NO SENSE".  */
         buflen = scsi_build_sense(NULL, 0, outbuf, r->buflen,
                                   (req->cmd.buf[1] & 1) == 0);
+        if (buflen < 0) {
+            goto illegal_request;
+        }
         break;
     case MECHANISM_STATUS:
         buflen = scsi_emulate_mechanism_status(s, outbuf);
@@ -1770,7 +1782,6 @@ static int32_t scsi_disk_emulate_command(SCSIRequest *req, uint8_t *buf)
             }
 
             /* Protection, exponent and lowest lba field left blank. */
-            buflen = req->cmd.xfer;
             break;
         }
         DPRINTF("Unsupported Service Action In\n");
@@ -1827,7 +1838,7 @@ static int32_t scsi_disk_emulate_command(SCSIRequest *req, uint8_t *buf)
         return 0;
     }
     assert(!r->req.aiocb);
-    r->iov.iov_len = MIN(buflen, req->cmd.xfer);
+    r->iov.iov_len = MIN(r->buflen, req->cmd.xfer);
     if (r->iov.iov_len == 0) {
         scsi_req_complete(&r->req, GOOD);
     }
@@ -1962,7 +1973,6 @@ static void scsi_disk_resize_cb(void *opaque)
      * direct-access devices.
      */
     if (s->qdev.type == TYPE_DISK) {
-        scsi_device_set_ua(&s->qdev, SENSE_CODE(CAPACITY_CHANGED));
         scsi_device_report_change(&s->qdev, SENSE_CODE(CAPACITY_CHANGED));
     }
 }
diff --git a/hw/usb/hcd-ohci.c b/hw/usb/hcd-ohci.c
index 6a39e9697b..64de906e41 100644
--- a/hw/usb/hcd-ohci.c
+++ b/hw/usb/hcd-ohci.c
@@ -1859,7 +1859,7 @@ static int ohci_init_pxa(SysBusDevice *dev)
 
     /* Cannot fail as we pass NULL for masterbus */
     usb_ohci_init(&s->ohci, &dev->qdev, s->num_ports, s->dma_offset, NULL, 0,
-                  NULL);
+                  &dma_context_memory);
     sysbus_init_irq(dev, &s->ohci.irq);
     sysbus_init_mmio(dev, &s->ohci.mem);
 
diff --git a/hw/virtio-scsi.c b/hw/virtio-scsi.c
index b54c7895fc..7d546f6ca7 100644
--- a/hw/virtio-scsi.c
+++ b/hw/virtio-scsi.c
@@ -204,7 +204,7 @@ static void virtio_scsi_bad_req(void)
 static void qemu_sgl_init_external(QEMUSGList *qsgl, struct iovec *sg,
                                    hwaddr *addr, int num)
 {
-    memset(qsgl, 0, sizeof(*qsgl));
+    qemu_sglist_init(qsgl, num, &dma_context_memory);
     while (num--) {
         qemu_sglist_add(qsgl, *(addr++), (sg++)->iov_len);
     }
@@ -596,6 +596,10 @@ static void virtio_scsi_push_event(VirtIOSCSI *s, SCSIDevice *dev,
     VirtIOSCSIEvent *evt;
     int in_size;
 
+    if (!(s->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)) {
+        return;
+    }
+
     if (!req) {
         s->events_dropped = true;
         return;
@@ -648,7 +652,6 @@ static void virtio_scsi_change(SCSIBus *bus, SCSIDevice *dev, SCSISense sense)
     VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus);
 
     if (((s->vdev.guest_features >> VIRTIO_SCSI_F_CHANGE) & 1) &&
-        (s->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK) &&
         dev->type != TYPE_ROM) {
         virtio_scsi_push_event(s, dev, VIRTIO_SCSI_T_PARAM_CHANGE,
                                sense.asc | (sense.ascq << 8));
@@ -659,8 +662,7 @@ static void virtio_scsi_hotplug(SCSIBus *bus, SCSIDevice *dev)
 {
     VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus);
 
-    if (((s->vdev.guest_features >> VIRTIO_SCSI_F_HOTPLUG) & 1) &&
-        (s->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)) {
+    if ((s->vdev.guest_features >> VIRTIO_SCSI_F_HOTPLUG) & 1) {
         virtio_scsi_push_event(s, dev, VIRTIO_SCSI_T_TRANSPORT_RESET,
                                VIRTIO_SCSI_EVT_RESET_RESCAN);
     }