[Qemu-devel] [RESEND] [PATCH] ide: fix GET_CONFIGURATION DVD-ROM support

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

The following patch implements fixes to the CD-ROM IDE/ATAPI emulation
since ide.c revision 1.66 and that prevents installation of OpenSolaris
guests because of timeouts like :

  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

It has been tested in Gentoo Linux 2007.0 amd64 (64bit) and x86 (32bit) hosts
using several different versions of Linux, FreeBSD, OpenBSD, NetBSD,
DragonFlyBSD, OpenSolaris and Windows 2000 guests

The patch implements changes to the following IDE commands as described by :

* change the model name (used by "INQUIRY" and "IDENTIFY DEVICE") to DVD
* recognize and honor "Allocation Length" parameter in "GET CONFIGURATION"
* only set "current profile" for the "GET CONFIGURATION" response if a profile
is current (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)

Carlo
---
Index: hw/ide.c
===================================================================
RCS file: /sources/qemu/qemu/hw/ide.c,v
retrieving revision 1.79
diff -u -p -r1.79 ide.c
--- hw/ide.c	24 Dec 2007 14:33:24 -0000	1.79
+++ hw/ide.c	26 Dec 2007 07:11:01 -0000
@@ -1,5 +1,5 @@
 /*
- * QEMU IDE disk and CD-ROM Emulator
+ * QEMU IDE disk and CD/DVD-ROM Emulator
  *
  * Copyright (c) 2003 Fabrice Bellard
  * Copyright (c) 2006 Openedhand Ltd.
@@ -540,7 +540,7 @@ static void ide_atapi_identify(IDEState 
     put_le16(p + 21, 512); /* cache size in sectors */
     put_le16(p + 22, 4); /* ecc bytes */
     padstr((char *)(p + 23), QEMU_VERSION, 8); /* firmware version */
-    padstr((char *)(p + 27), "QEMU CD-ROM", 40); /* model */
+    padstr((char *)(p + 27), "QEMU DVD-ROM", 40); /* model */
     put_le16(p + 48, 1); /* dword I/O (XXX: should not be set on CDROM) */
 #ifdef USE_DMA_CDROM
     put_le16(p + 49, 1 << 9 | 1 << 8); /* DMA and LBA supported */
@@ -1634,12 +1634,13 @@ static void ide_atapi_cmd(IDEState *s)
         buf[6] = 0; /* reserved */
         buf[7] = 0; /* reserved */
         padstr8(buf + 8, 8, "QEMU");
-        padstr8(buf + 16, 16, "QEMU CD-ROM");
+        padstr8(buf + 16, 16, "QEMU DVD-ROM");
         padstr8(buf + 32, 4, QEMU_VERSION);
         ide_atapi_cmd_reply(s, 36, max_len);
         break;
     case GPCMD_GET_CONFIGURATION:
         {
+            uint32_t len;
             uint64_t total_sectors;
 
             /* only feature 0 is supported */
@@ -1648,17 +1649,27 @@ 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: