[Qemu-devel] [PATCH v2 for-2.3 5/5] sysbus: Make devices picking up backends unavailable with -device

[Markus Armbruster <armbru@redhat.com>]

Device models aren't supposed to go on fishing expeditions for
backends.  They should expose suitable properties for the user to set.
For onboard devices, board code sets them.

A number of sysbus devices pick up block backends in their init() /
instance_init() methods with drive_get_next() instead: sl-nand,
milkymist-memcard, pl181, generic-sdhci.

Likewise, a number of sysbus devices pick up character backends in
their init() / realize() methods with qemu_char_get_next_serial():
cadence_uart, digic-uart, etraxfs,serial, lm32-juart, lm32-uart,
milkymist-uart, pl011, stm32f2xx-usart, xlnx.xps-uartlite.

All these mistakes are already marked FIXME.  See the commit that
added these FIXMEs for a more detailed explanation of what's wrong.

Fortunately, only machines ppce500 and pseries-* support -device with
sysbus devices, and none of the devices above is supported with these
machines.

Set cannot_instantiate_with_device_add_yet to preserve our luck.

Cc: Andrzej Zaborowski <balrogg@gmail.com>
Cc: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Cc: Antony Pavlov <antonynpavlov@gmail.com>
Cc: "Edgar E. Iglesias" <edgar.iglesias@gmail.com>
Cc: Michael Walle <michael@walle.cc>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
---
 hw/arm/spitz.c            | 2 ++
 hw/char/cadence_uart.c    | 2 ++
 hw/char/digic-uart.c      | 2 ++
 hw/char/etraxfs_ser.c     | 2 ++
 hw/char/lm32_juart.c      | 2 ++
 hw/char/lm32_uart.c       | 2 ++
 hw/char/milkymist-uart.c  | 2 ++
 hw/char/pl011.c           | 2 ++
 hw/char/stm32f2xx_usart.c | 2 ++
 hw/char/xilinx_uartlite.c | 2 ++
 hw/sd/milkymist-memcard.c | 2 ++
 hw/sd/pl181.c             | 2 ++
 hw/sd/sdhci.c             | 2 ++
 13 files changed, 26 insertions(+)

diff --git a/hw/arm/spitz.c b/hw/arm/spitz.c
index da02932..5bf032a 100644
--- a/hw/arm/spitz.c
+++ b/hw/arm/spitz.c
@@ -1036,6 +1036,8 @@ static void sl_nand_class_init(ObjectClass *klass, void *data)
     k->init = sl_nand_init;
     dc->vmsd = &vmstate_sl_nand_info;
     dc->props = sl_nand_properties;
+    /* Reason: init() method uses drive_get() */
+    dc->cannot_instantiate_with_device_add_yet = true;
 }
 
 static const TypeInfo sl_nand_info = {
diff --git a/hw/char/cadence_uart.c b/hw/char/cadence_uart.c
index 4f38f0c..d145378 100644
--- a/hw/char/cadence_uart.c
+++ b/hw/char/cadence_uart.c
@@ -537,6 +537,8 @@ static void cadence_uart_class_init(ObjectClass *klass, void *data)
     dc->realize = cadence_uart_realize;
     dc->vmsd = &vmstate_cadence_uart;
     dc->reset = cadence_uart_reset;
+    /* Reason: realize() method uses qemu_char_get_next_serial() */
+    dc->cannot_instantiate_with_device_add_yet = true;
 }
 
 static const TypeInfo cadence_uart_info = {
diff --git a/hw/char/digic-uart.c b/hw/char/digic-uart.c
index f272491..6d44576 100644
--- a/hw/char/digic-uart.c
+++ b/hw/char/digic-uart.c
@@ -177,6 +177,8 @@ static void digic_uart_class_init(ObjectClass *klass, void *data)
     dc->realize = digic_uart_realize;
     dc->reset = digic_uart_reset;
     dc->vmsd = &vmstate_digic_uart;
+    /* Reason: realize() method uses qemu_char_get_next_serial() */
+    dc->cannot_instantiate_with_device_add_yet = true;
 }
 
 static const TypeInfo digic_uart_info = {
diff --git a/hw/char/etraxfs_ser.c b/hw/char/etraxfs_ser.c
index 3381b86..857c136 100644
--- a/hw/char/etraxfs_ser.c
+++ b/hw/char/etraxfs_ser.c
@@ -236,6 +236,8 @@ static void etraxfs_ser_class_init(ObjectClass *klass, void *data)
 
     k->init = etraxfs_ser_init;
     dc->reset = etraxfs_ser_reset;
+    /* Reason: init() method uses qemu_char_get_next_serial() */
+    dc->cannot_instantiate_with_device_add_yet = true;
 }
 
 static const TypeInfo etraxfs_ser_info = {
diff --git a/hw/char/lm32_juart.c b/hw/char/lm32_juart.c
index 03285da..62763f2 100644
--- a/hw/char/lm32_juart.c
+++ b/hw/char/lm32_juart.c
@@ -145,6 +145,8 @@ static void lm32_juart_class_init(ObjectClass *klass, void *data)
     k->init = lm32_juart_init;
     dc->reset = juart_reset;
     dc->vmsd = &vmstate_lm32_juart;
+    /* Reason: init() method uses qemu_char_get_next_serial() */
+    dc->cannot_instantiate_with_device_add_yet = true;
 }
 
 static const TypeInfo lm32_juart_info = {
diff --git a/hw/char/lm32_uart.c b/hw/char/lm32_uart.c
index 39cad49..837a46e 100644
--- a/hw/char/lm32_uart.c
+++ b/hw/char/lm32_uart.c
@@ -285,6 +285,8 @@ static void lm32_uart_class_init(ObjectClass *klass, void *data)
     k->init = lm32_uart_init;
     dc->reset = uart_reset;
     dc->vmsd = &vmstate_lm32_uart;
+    /* Reason: init() method uses qemu_char_get_next_serial() */
+    dc->cannot_instantiate_with_device_add_yet = true;
 }
 
 static const TypeInfo lm32_uart_info = {
diff --git a/hw/char/milkymist-uart.c b/hw/char/milkymist-uart.c
index b79ea09..9b89b7e 100644
--- a/hw/char/milkymist-uart.c
+++ b/hw/char/milkymist-uart.c
@@ -235,6 +235,8 @@ static void milkymist_uart_class_init(ObjectClass *klass, void *data)
     dc->realize = milkymist_uart_realize;
     dc->reset = milkymist_uart_reset;
     dc->vmsd = &vmstate_milkymist_uart;
+    /* Reason: realize() method uses qemu_char_get_next_serial() */
+    dc->cannot_instantiate_with_device_add_yet = true;
 }
 
 static const TypeInfo milkymist_uart_info = {
diff --git a/hw/char/pl011.c b/hw/char/pl011.c
index d1cf00f..eac6fac 100644
--- a/hw/char/pl011.c
+++ b/hw/char/pl011.c
@@ -308,6 +308,8 @@ static void pl011_class_init(ObjectClass *oc, void *data)
 
     dc->realize = pl011_realize;
     dc->vmsd = &vmstate_pl011;
+    /* Reason: realize() method uses qemu_char_get_next_serial() */
+    dc->cannot_instantiate_with_device_add_yet = true;
 }
 
 static const TypeInfo pl011_arm_info = {
diff --git a/hw/char/stm32f2xx_usart.c b/hw/char/stm32f2xx_usart.c
index 669c4e3..c9d3a1b 100644
--- a/hw/char/stm32f2xx_usart.c
+++ b/hw/char/stm32f2xx_usart.c
@@ -212,6 +212,8 @@ static void stm32f2xx_usart_class_init(ObjectClass *klass, void *data)
     DeviceClass *dc = DEVICE_CLASS(klass);
 
     dc->reset = stm32f2xx_usart_reset;
+    /* Reason: instance_init() method uses qemu_char_get_next_serial() */
+    dc->cannot_instantiate_with_device_add_yet = true;
 }
 
 static const TypeInfo stm32f2xx_usart_info = {
diff --git a/hw/char/xilinx_uartlite.c b/hw/char/xilinx_uartlite.c
index cb54684..ef883a8 100644
--- a/hw/char/xilinx_uartlite.c
+++ b/hw/char/xilinx_uartlite.c
@@ -228,6 +228,8 @@ static void xilinx_uartlite_class_init(ObjectClass *klass, void *data)
 
     dc->reset = xilinx_uartlite_reset;
     dc->realize = xilinx_uartlite_realize;
+    /* Reason: realize() method uses qemu_char_get_next_serial() */
+    dc->cannot_instantiate_with_device_add_yet = true;
 }
 
 static const TypeInfo xilinx_uartlite_info = {
diff --git a/hw/sd/milkymist-memcard.c b/hw/sd/milkymist-memcard.c
index 0cc53d9..2209ef1 100644
--- a/hw/sd/milkymist-memcard.c
+++ b/hw/sd/milkymist-memcard.c
@@ -297,6 +297,8 @@ static void milkymist_memcard_class_init(ObjectClass *klass, void *data)
     k->init = milkymist_memcard_init;
     dc->reset = milkymist_memcard_reset;
     dc->vmsd = &vmstate_milkymist_memcard;
+    /* Reason: init() method uses drive_get_next() */
+    dc->cannot_instantiate_with_device_add_yet = true;
 }
 
 static const TypeInfo milkymist_memcard_info = {
diff --git a/hw/sd/pl181.c b/hw/sd/pl181.c
index bf37da6..11fcd47 100644
--- a/hw/sd/pl181.c
+++ b/hw/sd/pl181.c
@@ -508,6 +508,8 @@ static void pl181_class_init(ObjectClass *klass, void *data)
     sdc->init = pl181_init;
     k->vmsd = &vmstate_pl181;
     k->reset = pl181_reset;
+    /* Reason: init() method uses drive_get_next() */
+    k->cannot_instantiate_with_device_add_yet = true;
 }
 
 static const TypeInfo pl181_info = {
diff --git a/hw/sd/sdhci.c b/hw/sd/sdhci.c
index ab13505..e63367b 100644
--- a/hw/sd/sdhci.c
+++ b/hw/sd/sdhci.c
@@ -1297,6 +1297,8 @@ static void sdhci_sysbus_class_init(ObjectClass *klass, void *data)
     dc->vmsd = &sdhci_vmstate;
     dc->props = sdhci_properties;
     dc->realize = sdhci_sysbus_realize;
+    /* Reason: instance_init() method uses drive_get_next() */
+    dc->cannot_instantiate_with_device_add_yet = true;
 }
 
 static const TypeInfo sdhci_sysbus_info = {
-- 
1.9.3