[Qemu-devel] [PATCH 1/5] qemu: GET_CONFIGURATION fixes for MMC-6 DVD-ROM implementation

[Carlo Marcelo Arenas Belon <carenas@sajinet.com.pe>]

The following patch complements "Partial IDE DVD emulation", added in ide.c
revision 1.66 and that was generating the following timeouts for OpenSolaris
guests when trying to access the ATAPI cdrom (during installation for example):

  WARNING: /pci@0,0/pci-ide@1,1/ide@1 (ata1);
          timeout: abort request, target=0 lun=0
  WARNING: /pci@0,0/pci-ide@1,1/ide@1 (ata1):
          timeout: abort device, target=0 lun=0
  WARNING: /pci@0,0/pci-ide@1,1/ide@1 (ata1):
          timeout: reset target, target=0 lun=0
  WARNING: /pci@0,0/pci-ide@1,1/ide@1 (ata1):
          timeout: reset bus, target=0 lun=0

The changes required to the "GET CONFIGURATION" implementation are :

* recognize and honor "Allocation Length" command parameter
* only set "current profile" for the response if a profile is current (either
CD or DVD loaded)
* calculate "data length" including all headers
* refactor code and add comments to help document references to all implemented
standards (ATAPI-4, SPC-3 and MMC-6)

Signed-off-by: Carlo Marcelo Arenas Belon <carenas@sajinet.com.pe>
---
 qemu/hw/ide.c |   27 +++++++++++++++++++--------
 1 files changed, 19 insertions(+), 8 deletions(-)

diff --git a/qemu/hw/ide.c b/qemu/hw/ide.c
index 329d053..29fc7a9 100644
--- a/qemu/hw/ide.c
+++ b/qemu/hw/ide.c
@@ -1648,6 +1648,7 @@ static void ide_atapi_cmd(IDEState *s)
         break;
     case GPCMD_GET_CONFIGURATION:
         {
+            uint32_t len;
             int64_t total_sectors;
 
             /* only feature 0 is supported */
@@ -1656,17 +1657,27 @@ static void ide_atapi_cmd(IDEState *s)
                                     ASC_INV_FIELD_IN_CMD_PACKET);
                 break;
             }
-            memset(buf, 0, 32);
+            max_len = ube16_to_cpu(packet + 7);
             bdrv_get_geometry(s->bs, &total_sectors);
-            buf[3] = 16;
-            buf[7] = total_sectors <= 1433600 ? 0x08 : 0x10; /* current profile */
-            buf[10] = 0x10 | 0x1;
-            buf[11] = 0x08; /* size of profile list */
+            memset(buf, 0, 32);
+            if (total_sectors) {
+                if (total_sectors > 1433600) {
+                    buf[7] = 0x10; /* DVD-ROM */
+                } else {
+                    buf[7] = 0x08; /* CD-ROM */
+                }
+            } else {
+                buf[7] = 0x00; /* no current profile */
+            }
+            buf[10] = 0x02 | 0x01; /* persistent and current */
+            buf[11] = 0x08; /* size of profile list = 4 bytes per profile */
             buf[13] = 0x10; /* DVD-ROM profile */
-            buf[14] = buf[7] == 0x10; /* (in)active */
+            buf[14] = buf[13] == buf[7]; /* (in)active */
             buf[17] = 0x08; /* CD-ROM profile */
-            buf[18] = buf[7] == 0x08; /* (in)active */
-            ide_atapi_cmd_reply(s, 32, 32);
+            buf[18] = buf[17] == buf[7]; /* (in)active */
+            len = 8 + 4 + buf[11]; /* headers + size of profile list */
+            cpu_to_ube32(buf, len - 4); /* data length */
+            ide_atapi_cmd_reply(s, len, max_len);
             break;
         }
     default:
-- 
1.5.2.5