[Qemu-devel] [PATCH 18/41] scsi-hd: qdev properties for disk geometry

[Kevin Wolf <kwolf@redhat.com>]

From: Markus Armbruster <armbru@redhat.com>

Geometry needs to be qdev properties, because it belongs to the
disk's guest part.

Maintain backward compatibility exactly like for serial: fall back to
DriveInfo's geometry, set with -drive cyls=...

Do this only for scsi-hd.  scsi-disk is legacy.  scsi-cd doesn't have
a geometry.  scsi-block should get geometry from the host disk.

Bonus: info qtree now shows the geometry.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 hw/scsi-disk.c |   69 +++++++++++++++++++++++++++++++++++++------------------
 1 files changed, 46 insertions(+), 23 deletions(-)

diff --git a/hw/scsi-disk.c b/hw/scsi-disk.c
index c881acf..0a182f9 100644
--- a/hw/scsi-disk.c
+++ b/hw/scsi-disk.c
@@ -966,9 +966,6 @@ static int mode_sense_page(SCSIDiskState *s, int page, uint8_t **p_outbuf,
         [MODE_PAGE_AUDIO_CTL]              = (1 << TYPE_ROM),
         [MODE_PAGE_CAPABILITIES]           = (1 << TYPE_ROM),
     };
-
-    BlockDriverState *bdrv = s->qdev.conf.bs;
-    uint32_t cylinders, heads, secs;
     uint8_t *p = *p_outbuf;
 
     if ((mode_sense_valid[page] & (1 << s->qdev.type)) == 0) {
@@ -990,19 +987,18 @@ static int mode_sense_page(SCSIDiskState *s, int page, uint8_t **p_outbuf,
             break;
         }
         /* if a geometry hint is available, use it */
-        hd_geometry_guess(bdrv, &cylinders, &heads, &secs, NULL);
-        p[2] = (cylinders >> 16) & 0xff;
-        p[3] = (cylinders >> 8) & 0xff;
-        p[4] = cylinders & 0xff;
-        p[5] = heads & 0xff;
+        p[2] = (s->qdev.conf.cyls >> 16) & 0xff;
+        p[3] = (s->qdev.conf.cyls >> 8) & 0xff;
+        p[4] = s->qdev.conf.cyls & 0xff;
+        p[5] = s->qdev.conf.heads & 0xff;
         /* Write precomp start cylinder, disabled */
-        p[6] = (cylinders >> 16) & 0xff;
-        p[7] = (cylinders >> 8) & 0xff;
-        p[8] = cylinders & 0xff;
+        p[6] = (s->qdev.conf.cyls >> 16) & 0xff;
+        p[7] = (s->qdev.conf.cyls >> 8) & 0xff;
+        p[8] = s->qdev.conf.cyls & 0xff;
         /* Reduced current start cylinder, disabled */
-        p[9] = (cylinders >> 16) & 0xff;
-        p[10] = (cylinders >> 8) & 0xff;
-        p[11] = cylinders & 0xff;
+        p[9] = (s->qdev.conf.cyls >> 16) & 0xff;
+        p[10] = (s->qdev.conf.cyls >> 8) & 0xff;
+        p[11] = s->qdev.conf.cyls & 0xff;
         /* Device step rate [ns], 200ns */
         p[12] = 0;
         p[13] = 200;
@@ -1024,18 +1020,17 @@ static int mode_sense_page(SCSIDiskState *s, int page, uint8_t **p_outbuf,
         p[2] = 5000 >> 8;
         p[3] = 5000 & 0xff;
         /* if a geometry hint is available, use it */
-        hd_geometry_guess(bdrv, &cylinders, &heads, &secs, NULL);
-        p[4] = heads & 0xff;
-        p[5] = secs & 0xff;
+        p[4] = s->qdev.conf.heads & 0xff;
+        p[5] = s->qdev.conf.secs & 0xff;
         p[6] = s->qdev.blocksize >> 8;
-        p[8] = (cylinders >> 8) & 0xff;
-        p[9] = cylinders & 0xff;
+        p[8] = (s->qdev.conf.cyls >> 8) & 0xff;
+        p[9] = s->qdev.conf.cyls & 0xff;
         /* Write precomp start cylinder, disabled */
-        p[10] = (cylinders >> 8) & 0xff;
-        p[11] = cylinders & 0xff;
+        p[10] = (s->qdev.conf.cyls >> 8) & 0xff;
+        p[11] = s->qdev.conf.cyls & 0xff;
         /* Reduced current start cylinder, disabled */
-        p[12] = (cylinders >> 8) & 0xff;
-        p[13] = cylinders & 0xff;
+        p[12] = (s->qdev.conf.cyls >> 8) & 0xff;
+        p[13] = s->qdev.conf.cyls & 0xff;
         /* Device step rate [100us], 100us */
         p[14] = 0;
         p[15] = 1;
@@ -1755,6 +1750,33 @@ static int scsi_initfn(SCSIDevice *dev)
         return -1;
     }
 
+    if (!dev->conf.cyls && !dev->conf.heads && !dev->conf.secs) {
+        /* try to fall back to value set with legacy -drive cyls=... */
+        dinfo = drive_get_by_blockdev(s->qdev.conf.bs);
+        dev->conf.cyls = dinfo->cyls;
+        dev->conf.heads = dinfo->heads;
+        dev->conf.secs = dinfo->secs;
+    }
+    if (!dev->conf.cyls && !dev->conf.heads && !dev->conf.secs) {
+        hd_geometry_guess(s->qdev.conf.bs,
+                          &dev->conf.cyls, &dev->conf.heads, &dev->conf.secs,
+                          NULL);
+    }
+    if (dev->conf.cyls || dev->conf.heads || dev->conf.secs) {
+        if (dev->conf.cyls < 1 || dev->conf.cyls > 65535) {
+            error_report("cyls must be between 1 and 65535");
+            return -1;
+        }
+        if (dev->conf.heads < 1 || dev->conf.heads > 255) {
+            error_report("heads must be between 1 and 255");
+            return -1;
+        }
+        if (dev->conf.secs < 1 || dev->conf.secs > 255) {
+            error_report("secs must be between 1 and 255");
+            return -1;
+        }
+    }
+
     if (!s->serial) {
         /* try to fall back to value set with legacy -drive serial=... */
         dinfo = drive_get_by_blockdev(s->qdev.conf.bs);
@@ -1975,6 +1997,7 @@ static Property scsi_hd_properties[] = {
     DEFINE_PROP_BIT("dpofua", SCSIDiskState, features,
                     SCSI_DISK_F_DPOFUA, false),
     DEFINE_PROP_HEX64("wwn", SCSIDiskState, wwn, 0),
+    DEFINE_BLOCK_CHS_PROPERTIES(SCSIDiskState, qdev.conf),
     DEFINE_PROP_END_OF_LIST(),
 };
 
-- 
1.7.6.5