[Qemu-devel] Fwd: [PATCH v2 6/6] geometry: Target specific hook for s390x in geometry guessing

[Qemu-devel] Fwd: [PATCH v2 6/6] geometry: Target specific hook for s390x in geometry guessing

[Ekaterina Tumanova]

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-------- Forwarded Message --------
Subject: [PATCH v2 6/6] geometry: Target specific hook for s390x in 
geometry guessing
Date: Tue, 18 Nov 2014 17:10:01 +0100
From: Ekaterina Tumanova <tumanova@linux.vnet.ibm.com>
To: armbru@redhat.com, pbonzini@redhat.com, stefanha@redhat.com, 
kwolf@redhat.com
CC: borntraeger@de.ibm.com, cornelia.huck@de.ibm.com, 
dahi@linux.vnet.ibm.com, mihajlov@linux.vnet.ibm.com, Ekaterina Tumanova 
<tumanova@linux.vnet.ibm.com>

For target-s390x, the behaviour is chosen as follows:
If no geo could be guessed from backing device, guess_disk_lchs (partition
table guessing) is called.
If this is not successful (e.g. image files) geometry is derived from the
size of the disk (as before).
We have no translation on s390, so we simply set in to NONE.

Signed-off-by: Ekaterina Tumanova <tumanova@linux.vnet.ibm.com>
---
  hw/block/Makefile.objs |  6 +++++-
  hw/block/hd-geometry.c | 36 +++++++++++++++++++++++++++++++-----
  2 files changed, 36 insertions(+), 6 deletions(-)

diff --git a/hw/block/Makefile.objs b/hw/block/Makefile.objs
index d4c3ab7..1f7da7a 100644
--- a/hw/block/Makefile.objs
+++ b/hw/block/Makefile.objs
@@ -1,4 +1,4 @@
-common-obj-y += block.o cdrom.o hd-geometry.o
+common-obj-y += block.o cdrom.o
  common-obj-$(CONFIG_FDC) += fdc.o
  common-obj-$(CONFIG_SSI_M25P80) += m25p80.o
  common-obj-$(CONFIG_NAND) += nand.o
@@ -13,3 +13,7 @@ obj-$(CONFIG_SH4) += tc58128.o

  obj-$(CONFIG_VIRTIO) += virtio-blk.o
  obj-$(CONFIG_VIRTIO) += dataplane/
+
+# geometry is target/architecture dependent and therefore needs to be built
+# for every target platform
+obj-y += hd-geometry.o
diff --git a/hw/block/hd-geometry.c b/hw/block/hd-geometry.c
index 4972114..b462225 100644
--- a/hw/block/hd-geometry.c
+++ b/hw/block/hd-geometry.c
@@ -49,11 +49,12 @@ struct partition {

  /* try to guess the disk logical geometry from the MSDOS partition table.
     Return 0 if OK, -1 if could not guess */
-static int guess_disk_lchs(BlockBackend *blk,
-                           int *pcylinders, int *pheads, int *psectors)
+static int guess_disk_lchs(BlockBackend *blk, uint32_t *pcylinders,
+                           uint32_t *pheads, uint32_t *psectors)
  {
      uint8_t buf[BDRV_SECTOR_SIZE];
-    int i, heads, sectors, cylinders;
+    int i;
+    uint32_t heads, sectors, cylinders;
      struct partition *p;
      uint32_t nr_sects;
      uint64_t nb_sectors;
@@ -116,11 +117,11 @@ static void guess_chs_for_size(BlockBackend *blk,
      *psecs = 63;
  }

+#ifdef TARGET_S390X
  void hd_geometry_guess(BlockBackend *blk,
                         uint32_t *pcyls, uint32_t *pheads, uint32_t *psecs,
                         int *ptrans)
  {
-    int cylinders, heads, secs, translation;
      struct ProbeGeometry geometry = blk_probe_geometry(blk);

      if (geometry.rc == 0) {
@@ -129,7 +130,32 @@ void hd_geometry_guess(BlockBackend *blk,
          *pheads = geometry.geo.heads;
          goto done;
      }
+    if (guess_disk_lchs(blk, pcyls, pheads, psecs) == 0) {
+        goto done;
+    }
+    guess_chs_for_size(blk, pcyls, pheads, psecs);
+done:
+    if (ptrans) {
+        *ptrans = BIOS_ATA_TRANSLATION_NONE;
+    }

+    trace_hd_geometry_guess(blk, *pcyls, *pheads, *psecs,
+                            BIOS_ATA_TRANSLATION_NONE);
+}
+#else
+void hd_geometry_guess(BlockBackend *blk,
+                       uint32_t *pcyls, uint32_t *pheads, uint32_t *psecs,
+                       int *ptrans)
+{
+    int cylinders, heads, secs, translation;
+    struct ProbeGeometry geometry = blk_probe_geometry(blk);
+
+    if (geometry.rc == 0) {
+        *pcyls = geometry.geo.cylinders;
+        *psecs = geometry.geo.sectors;
+        *pheads = geometry.geo.heads;
+        goto done;
+    }
      if (guess_disk_lchs(blk, &cylinders, &heads, &secs) < 0) {
          /* no LCHS guess: use a standard physical disk geometry  */
          guess_chs_for_size(blk, pcyls, pheads, psecs);
@@ -157,7 +183,7 @@ done:
      }
      trace_hd_geometry_guess(blk, *pcyls, *pheads, *psecs, translation);
  }
-
+#endif
  int hd_bios_chs_auto_trans(uint32_t cyls, uint32_t heads, uint32_t secs)
  {
      return cyls <= 1024 && heads <= 16 && secs <= 63
-- 
1.8.5.5