QOM patches for 2020-06-15

[PULL 20/84] display/sm501 display/ati: Fix to realize "i2c-ddc"

Markus Armbruster posted 84 patches 5 years, 5 months ago

Download mbox

Maintainers: Eduardo Habkost <ehabkost@redhat.com>, Leif Lindholm <leif@nuviainc.com>, Michael Walle <michael@walle.cc>, Chris Wulff <crwulff@gmail.com>, Matthew Rosato <mjrosato@linux.ibm.com>, Max Filippov <jcmvbkbc@gmail.com>, Juan Quintela <quintela@redhat.com>, Aurelien Jarno <aurelien@aurel32.net>, Fam Zheng <fam@euphon.net>, "Cédric Le Goater" <clg@kaod.org>, Fabien Chouteau <chouteau@adacore.com>, Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>, BALATON Zoltan <balaton@eik.bme.hu>, Sagar Karandikar <sagark@eecs.berkeley.edu>, "Edgar E. Iglesias" <edgar.iglesias@gmail.com>, Andrzej Zaborowski <balrogg@gmail.com>, Andrew Jeffery <andrew@aj.id.au>, Cornelia Huck <cohuck@redhat.com>, Alistair Francis <Alistair.Francis@wdc.com>, Paul Burton <pburton@wavecomp.com>, Stefano Stabellini <sstabellini@kernel.org>, Subbaraya Sundeep <sundeep.lkml@gmail.com>, Helge Deller <deller@gmx.de>, "Marc-André Lureau" <marcandre.lureau@redhat.com>, Radoslaw Biernacki <radoslaw.biernacki@linaro.org>, John Snow <jsnow@redhat.com>, Halil Pasic <pasic@linux.ibm.com>, Anthony Perard <anthony.perard@citrix.com>, Jan Kiszka <jan.kiszka@web.de>, "Michael S. Tsirkin" <mst@redhat.com>, Tony Krowiak <akrowiak@linux.ibm.com>, Joel Stanley <joel@jms.id.au>, Rob Herring <robh@kernel.org>, Paul Durrant <paul@xen.org>, Jason Wang <jasowang@redhat.com>, David Gibson <david@gibson.dropbear.id.au>, Jean-Christophe Dubois <jcd@tribudubois.net>, Peter Maydell <peter.maydell@linaro.org>, "Dr. David Alan Gilbert" <dgilbert@redhat.com>, Samuel Thibault <samuel.thibault@ens-lyon.org>, "Philippe Mathieu-Daudé" <philmd@redhat.com>, David Hildenbrand <david@redhat.com>, Marcel Apfelbaum <marcel.apfelbaum@gmail.com>, Thomas Huth <thuth@redhat.com>, Bastian Koppelmann <kbastian@mail.uni-paderborn.de>, Jia Liu <proljc@gmail.com>, Andrey Smirnov <andrew.smirnov@gmail.com>, KONRAD Frederic <frederic.konrad@adacore.com>, Beniamino Galvani <b.galvani@gmail.com>, Christian Borntraeger <borntraeger@de.ibm.com>, Laurent Vivier <laurent@vivier.eu>, Max Reitz <mreitz@redhat.com>, Aleksandar Markovic <aleksandar.qemu.devel@gmail.com>, "Daniel P. Berrangé" <berrange@redhat.com>, Richard Henderson <rth@twiddle.net>, Aleksandar Rikalo <aleksandar.rikalo@syrmia.com>, Jiaxun Yang <jiaxun.yang@flygoat.com>, Corey Minyard <cminyard@mvista.com>, Huacai Chen <chenhc@lemote.com>, Gerd Hoffmann <kraxel@redhat.com>, Kevin Wolf <kwolf@redhat.com>, Peter Chubb <peter.chubb@nicta.com.au>, Paolo Bonzini <pbonzini@redhat.com>, Magnus Damm <magnus.damm@gmail.com>, Igor Mammedov <imammedo@redhat.com>, Pierre Morel <pmorel@linux.ibm.com>, Alistair Francis <alistair@alistair23.me>, Laszlo Ersek <lersek@redhat.com>, Andrew Baumann <Andrew.Baumann@microsoft.com>, Marek Vasut <marex@denx.de>, "Hervé Poussineau" <hpoussin@reactos.org>, Thomas Huth <huth@tuxfamily.org>, Stafford Horne <shorne@gmail.com>, Igor Mitsyanko <i.mitsyanko@gmail.com>, Palmer Dabbelt <palmer@dabbelt.com>, Artyom Tarasenko <atar4qemu@gmail.com>, Niek Linnenbank <nieklinnenbank@gmail.com>, Antony Pavlov <antonynpavlov@gmail.com>

Expand all Fold all

[PULL 20/84] display/sm501 display/ati: Fix to realize "i2c-ddc"

Posted by Markus Armbruster 5 years, 5 months ago

sm501_init() and ati_vga_realize() create an "i2c-ddc" device, but
neglect to realize it.  Affects machines sam460ex, shix, r2d, and
fulong2e.

In theory, a device becomes real only on realize.  In practice, the
transition from unreal to real is a fuzzy one.  The work to make a
device real can be spread between realize methods (fine),
instance_init methods (wrong), and board code wiring up the device
(fine as long as it effectively happens on realize).  Depending on
what exactly is done where, a device can work even when we neglect
to realize it.

This one appears to work.  Nevertheless, it's a clear misuse of the
interface.  Even when it works today (more or less by chance), it can
break tomorrow.

Fix by realizing it right away.  Visible in "info qom-tree"; here's
the change for sam460ex:

     /machine (sam460ex-machine)
       [...]
       /unattached (container)
         [...]
    -    /device[14] (sii3112)
    +    /device[14] (i2c-ddc)
    +    /device[15] (sii3112)
         [rest of device[*] renumbered...]

Fixes: 4a1f253adb45ac6019971193d5077c4d5d55886a
Fixes: c82c7336de58876862e6b4dccbda29e9240fd388
Cc: BALATON Zoltan <balaton@eik.bme.hu>
Cc: qemu-ppc@nongnu.org
Cc: Magnus Damm <magnus.damm@gmail.com>
Cc: Philippe Mathieu-Daudé <f4bug@amsat.org>
Cc: Aleksandar Markovic <aleksandar.qemu.devel@gmail.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Tested-by: BALATON Zoltan <balaton@eik.bme.hu>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20200609122339.937862-19-armbru@redhat.com>
---
 hw/display/ati.c   | 2 ++
 hw/display/sm501.c | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/hw/display/ati.c b/hw/display/ati.c
index 67604e68de..1d9df92b96 100644
--- a/hw/display/ati.c
+++ b/hw/display/ati.c
@@ -935,6 +935,8 @@ static void ati_vga_realize(PCIDevice *dev, Error **errp)
     bitbang_i2c_init(&s->bbi2c, i2cbus);
     I2CSlave *i2cddc = I2C_SLAVE(qdev_create(BUS(i2cbus), TYPE_I2CDDC));
     i2c_set_slave_address(i2cddc, 0x50);
+    object_property_set_bool(OBJECT(i2cddc), true, "realized",
+                             &error_abort);
 
     /* mmio register space */
     memory_region_init_io(&s->mm, OBJECT(s), &ati_mm_ops, s,
diff --git a/hw/display/sm501.c b/hw/display/sm501.c
index edd8d24a76..fa23a78164 100644
--- a/hw/display/sm501.c
+++ b/hw/display/sm501.c
@@ -1833,6 +1833,8 @@ static void sm501_init(SM501State *s, DeviceState *dev,
     /* ddc */
     I2CDDCState *ddc = I2CDDC(qdev_create(BUS(s->i2c_bus), TYPE_I2CDDC));
     i2c_set_slave_address(I2C_SLAVE(ddc), 0x50);
+    object_property_set_bool(OBJECT(ddc), true, "realized",
+                             &error_abort);
 
     /* mmio */
     memory_region_init(&s->mmio_region, OBJECT(dev), "sm501.mmio", MMIO_SIZE);
-- 
2.26.2