[PATCHv2,1/3] Split serial-isa into its own config option

At present, the core device model code for 8250-like serial ports
(serial.c) and the code for serial ports attached to ISA-style legacy IO
(serial-isa.c) are both controlled by the CONFIG_SERIAL variable.

There are lots and lots of embedded platforms that have 8250-like serial
ports but have never had anything resembling ISA legacy IO.  Therefore,
split serial-isa into its own CONFIG_SERIAL_ISA option so it can be
disabled for platforms where it's not appropriate.

For now, I enabled CONFIG_SERIAL_ISA in every default-config where
CONFIG_SERIAL is enabled, excepting microblaze, or32, and xtensa.  As best
as I can tell, those platforms never used legacy ISA, and also don't
include PCI support (which would allow connection of a PCI->ISA bridge
and/or a southbridge including legacy ISA serial ports).

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Thomas Huth <thuth@redhat.com>
---
 default-configs/alpha-softmmu.mak       | 1 +
 default-configs/arm-softmmu.mak         | 1 +
 default-configs/i386-softmmu.mak        | 1 +
 default-configs/mips-softmmu-common.mak | 1 +
 default-configs/moxie-softmmu.mak       | 1 +
 default-configs/pci.mak                 | 1 +
 default-configs/ppc-softmmu.mak         | 1 +
 default-configs/ppc64-softmmu.mak       | 1 +
 default-configs/ppcemb-softmmu.mak      | 1 +
 default-configs/sh4-softmmu.mak         | 1 +
 default-configs/sh4eb-softmmu.mak       | 1 +
 default-configs/sparc64-softmmu.mak     | 1 +
 default-configs/x86_64-softmmu.mak      | 1 +
 hw/char/Makefile.objs                   | 3 ++-
 14 files changed, 15 insertions(+), 1 deletion(-)

On 11/09/2016 01:22 PM, David Gibson wrote:
> At present, the core device model code for 8250-like serial ports
> (serial.c) and the code for serial ports attached to ISA-style legacy IO
> (serial-isa.c) are both controlled by the CONFIG_SERIAL variable.
> 
> There are lots and lots of embedded platforms that have 8250-like serial
> ports but have never had anything resembling ISA legacy IO.  Therefore,
> split serial-isa into its own CONFIG_SERIAL_ISA option so it can be
> disabled for platforms where it's not appropriate.
> 
> For now, I enabled CONFIG_SERIAL_ISA in every default-config where
> CONFIG_SERIAL is enabled, excepting microblaze, or32, and xtensa.  As best
> as I can tell, those platforms never used legacy ISA, and also don't
> include PCI support (which would allow connection of a PCI->ISA bridge
> and/or a southbridge including legacy ISA serial ports).
> 
> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
> Reviewed-by: Thomas Huth <thuth@redhat.com>

Should be fine for s390 (we do not even have serial)

Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>

> ---
>  default-configs/alpha-softmmu.mak       | 1 +
>  default-configs/arm-softmmu.mak         | 1 +
>  default-configs/i386-softmmu.mak        | 1 +
>  default-configs/mips-softmmu-common.mak | 1 +
>  default-configs/moxie-softmmu.mak       | 1 +
>  default-configs/pci.mak                 | 1 +
>  default-configs/ppc-softmmu.mak         | 1 +
>  default-configs/ppc64-softmmu.mak       | 1 +
>  default-configs/ppcemb-softmmu.mak      | 1 +
>  default-configs/sh4-softmmu.mak         | 1 +
>  default-configs/sh4eb-softmmu.mak       | 1 +
>  default-configs/sparc64-softmmu.mak     | 1 +
>  default-configs/x86_64-softmmu.mak      | 1 +
>  hw/char/Makefile.objs                   | 3 ++-
>  14 files changed, 15 insertions(+), 1 deletion(-)
> 
> diff --git a/default-configs/alpha-softmmu.mak b/default-configs/alpha-softmmu.mak
> index 7f6161e..e0d75e3 100644
> --- a/default-configs/alpha-softmmu.mak
> +++ b/default-configs/alpha-softmmu.mak
> @@ -3,6 +3,7 @@
>  include pci.mak
>  include usb.mak
>  CONFIG_SERIAL=y
> +CONFIG_SERIAL_ISA=y
>  CONFIG_I8254=y
>  CONFIG_PCKBD=y
>  CONFIG_VGA_CIRRUS=y
> diff --git a/default-configs/arm-softmmu.mak b/default-configs/arm-softmmu.mak
> index 6de3e16..dcbcea7 100644
> --- a/default-configs/arm-softmmu.mak
> +++ b/default-configs/arm-softmmu.mak
> @@ -6,6 +6,7 @@ CONFIG_VGA=y
>  CONFIG_NAND=y
>  CONFIG_ECC=y
>  CONFIG_SERIAL=y
> +CONFIG_SERIAL_ISA=y
>  CONFIG_PTIMER=y
>  CONFIG_SD=y
>  CONFIG_MAX7310=y
> diff --git a/default-configs/i386-softmmu.mak b/default-configs/i386-softmmu.mak
> index 0b51360..3f2e820 100644
> --- a/default-configs/i386-softmmu.mak
> +++ b/default-configs/i386-softmmu.mak
> @@ -15,6 +15,7 @@ CONFIG_IPMI_EXTERN=y
>  CONFIG_ISA_IPMI_KCS=y
>  CONFIG_ISA_IPMI_BT=y
>  CONFIG_SERIAL=y
> +CONFIG_SERIAL_ISA=y
>  CONFIG_PARALLEL=y
>  CONFIG_I8254=y
>  CONFIG_PCSPK=y
> diff --git a/default-configs/mips-softmmu-common.mak b/default-configs/mips-softmmu-common.mak
> index 0394514..5b8b0c9 100644
> --- a/default-configs/mips-softmmu-common.mak
> +++ b/default-configs/mips-softmmu-common.mak
> @@ -9,6 +9,7 @@ CONFIG_VGA_ISA_MM=y
>  CONFIG_VGA_CIRRUS=y
>  CONFIG_VMWARE_VGA=y
>  CONFIG_SERIAL=y
> +CONFIG_SERIAL_ISA=y
>  CONFIG_PARALLEL=y
>  CONFIG_I8254=y
>  CONFIG_PCSPK=y
> diff --git a/default-configs/moxie-softmmu.mak b/default-configs/moxie-softmmu.mak
> index 1a95476..7e22863 100644
> --- a/default-configs/moxie-softmmu.mak
> +++ b/default-configs/moxie-softmmu.mak
> @@ -2,4 +2,5 @@
> 
>  CONFIG_MC146818RTC=y
>  CONFIG_SERIAL=y
> +CONFIG_SERIAL_ISA=y
>  CONFIG_VGA=y
> diff --git a/default-configs/pci.mak b/default-configs/pci.mak
> index fff7ce3..d8d6548 100644
> --- a/default-configs/pci.mak
> +++ b/default-configs/pci.mak
> @@ -27,6 +27,7 @@ CONFIG_AHCI=y
>  CONFIG_ESP=y
>  CONFIG_ESP_PCI=y
>  CONFIG_SERIAL=y
> +CONFIG_SERIAL_ISA=y
>  CONFIG_SERIAL_PCI=y
>  CONFIG_IPACK=y
>  CONFIG_WDT_IB6300ESB=y
> diff --git a/default-configs/ppc-softmmu.mak b/default-configs/ppc-softmmu.mak
> index d4d0f9b..13eb94f 100644
> --- a/default-configs/ppc-softmmu.mak
> +++ b/default-configs/ppc-softmmu.mak
> @@ -45,5 +45,6 @@ CONFIG_PLATFORM_BUS=y
>  CONFIG_ETSEC=y
>  CONFIG_LIBDECNUMBER=y
>  # For PReP
> +CONFIG_SERIAL_ISA=y
>  CONFIG_MC146818RTC=y
>  CONFIG_ISA_TESTDEV=y
> diff --git a/default-configs/ppc64-softmmu.mak b/default-configs/ppc64-softmmu.mak
> index 67a9bca..f607125 100644
> --- a/default-configs/ppc64-softmmu.mak
> +++ b/default-configs/ppc64-softmmu.mak
> @@ -52,6 +52,7 @@ CONFIG_XICS=$(CONFIG_PSERIES)
>  CONFIG_XICS_SPAPR=$(CONFIG_PSERIES)
>  CONFIG_XICS_KVM=$(and $(CONFIG_PSERIES),$(CONFIG_KVM))
>  # For PReP
> +CONFIG_SERIAL_ISA=y
>  CONFIG_MC146818RTC=y
>  CONFIG_ISA_TESTDEV=y
>  CONFIG_MEM_HOTPLUG=y
> diff --git a/default-configs/ppcemb-softmmu.mak b/default-configs/ppcemb-softmmu.mak
> index 54acc4d..7f56004 100644
> --- a/default-configs/ppcemb-softmmu.mak
> +++ b/default-configs/ppcemb-softmmu.mak
> @@ -5,6 +5,7 @@ include sound.mak
>  include usb.mak
>  CONFIG_M48T59=y
>  CONFIG_SERIAL=y
> +CONFIG_SERIAL_ISA=y
>  CONFIG_I8257=y
>  CONFIG_OPENPIC=y
>  CONFIG_PFLASH_CFI01=y
> diff --git a/default-configs/sh4-softmmu.mak b/default-configs/sh4-softmmu.mak
> index 8e00390..546d855 100644
> --- a/default-configs/sh4-softmmu.mak
> +++ b/default-configs/sh4-softmmu.mak
> @@ -3,6 +3,7 @@
>  include pci.mak
>  include usb.mak
>  CONFIG_SERIAL=y
> +CONFIG_SERIAL_ISA=y
>  CONFIG_PTIMER=y
>  CONFIG_PFLASH_CFI02=y
>  CONFIG_SH4=y
> diff --git a/default-configs/sh4eb-softmmu.mak b/default-configs/sh4eb-softmmu.mak
> index efdd058..2d3fd49 100644
> --- a/default-configs/sh4eb-softmmu.mak
> +++ b/default-configs/sh4eb-softmmu.mak
> @@ -3,6 +3,7 @@
>  include pci.mak
>  include usb.mak
>  CONFIG_SERIAL=y
> +CONFIG_SERIAL_ISA=y
>  CONFIG_PTIMER=y
>  CONFIG_PFLASH_CFI02=y
>  CONFIG_SH4=y
> diff --git a/default-configs/sparc64-softmmu.mak b/default-configs/sparc64-softmmu.mak
> index c0cdd64..922db55 100644
> --- a/default-configs/sparc64-softmmu.mak
> +++ b/default-configs/sparc64-softmmu.mak
> @@ -5,6 +5,7 @@ include usb.mak
>  CONFIG_M48T59=y
>  CONFIG_PTIMER=y
>  CONFIG_SERIAL=y
> +CONFIG_SERIAL_ISA=y
>  CONFIG_PARALLEL=y
>  CONFIG_PCKBD=y
>  CONFIG_FDC=y
> diff --git a/default-configs/x86_64-softmmu.mak b/default-configs/x86_64-softmmu.mak
> index 7f89503..f34bc80 100644
> --- a/default-configs/x86_64-softmmu.mak
> +++ b/default-configs/x86_64-softmmu.mak
> @@ -15,6 +15,7 @@ CONFIG_IPMI_EXTERN=y
>  CONFIG_ISA_IPMI_KCS=y
>  CONFIG_ISA_IPMI_BT=y
>  CONFIG_SERIAL=y
> +CONFIG_SERIAL_ISA=y
>  CONFIG_PARALLEL=y
>  CONFIG_I8254=y
>  CONFIG_PCSPK=y
> diff --git a/hw/char/Makefile.objs b/hw/char/Makefile.objs
> index 69a553c..6ea76fe 100644
> --- a/hw/char/Makefile.objs
> +++ b/hw/char/Makefile.objs
> @@ -2,7 +2,8 @@ common-obj-$(CONFIG_IPACK) += ipoctal232.o
>  common-obj-$(CONFIG_ESCC) += escc.o
>  common-obj-$(CONFIG_PARALLEL) += parallel.o
>  common-obj-$(CONFIG_PL011) += pl011.o
> -common-obj-$(CONFIG_SERIAL) += serial.o serial-isa.o
> +common-obj-$(CONFIG_SERIAL) += serial.o
> +common-obj-$(CONFIG_SERIAL_ISA) += serial-isa.o
>  common-obj-$(CONFIG_SERIAL_PCI) += serial-pci.o
>  common-obj-$(CONFIG_VIRTIO) += virtio-console.o
>  common-obj-$(CONFIG_XILINX) += xilinx_uartlite.o
>

David Gibson <david@gibson.dropbear.id.au> writes:

> At present, the core device model code for 8250-like serial ports
> (serial.c) and the code for serial ports attached to ISA-style legacy IO
> (serial-isa.c) are both controlled by the CONFIG_SERIAL variable.
>
> There are lots and lots of embedded platforms that have 8250-like serial
> ports but have never had anything resembling ISA legacy IO.  Therefore,
> split serial-isa into its own CONFIG_SERIAL_ISA option so it can be
> disabled for platforms where it's not appropriate.
>
> For now, I enabled CONFIG_SERIAL_ISA in every default-config where
> CONFIG_SERIAL is enabled, excepting microblaze, or32, and xtensa.  As best
> as I can tell, those platforms never used legacy ISA, and also don't
> include PCI support (which would allow connection of a PCI->ISA bridge
> and/or a southbridge including legacy ISA serial ports).

I poked them with nm, and the result supports your claims.

> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
> Reviewed-by: Thomas Huth <thuth@redhat.com>

Reviewed-by: Markus Armbruster <armbru@redhat.com>