[PATCH 0/1] char: ipmi: Handle HAS_IOPORT dependencies

[PATCH 0/1] char: ipmi: Handle HAS_IOPORT dependencies

[Niklas Schnelle]

Hi Corey,

This is a follow up in my ongoing effort of making inb()/outb() and
similar I/O port accessors compile-time optional. Previously I sent this
as a treewide series titled "treewide: Remove I/O port accessors for
HAS_IOPORT=n" with the latest being its 5th version[0]. With a significant
subset of patches merged I've changed over to per-subsystem series. These
series are stand alone and should be merged via the relevant tree such
that with all subsystems complete we can follow this up with the final
patch that will make the I/O port accessors compile-time optional.

The current state of the full series with changes to the remaining
subsystems and the aforementioned final patch can be found for your
convenience on my git.kernel.org tree in the has_ioport_v6 branch[1] with
signed tags. As for compile-time vs runtime see Linus' reply to my first
attempt[2].

Thanks,
Niklas

[0] https://lore.kernel.org/all/20230522105049.1467313-1-schnelle@linux.ibm.com/
[1] https://git.kernel.org/pub/scm/linux/kernel/git/niks/linux.git/log/?h=has_ioport_v6
[2] https://lore.kernel.org/lkml/CAHk-=wg80je=K7madF4e7WrRNp37e3qh6y10Svhdc7O8SZ_-8g@mail.gmail.com/

Niklas Schnelle (1):
  char: ipmi: handle HAS_IOPORT dependencies

 drivers/char/ipmi/Makefile       | 11 ++++-------
 drivers/char/ipmi/ipmi_si_intf.c |  3 ++-
 drivers/char/ipmi/ipmi_si_pci.c  |  3 +++
 3 files changed, 9 insertions(+), 8 deletions(-)

-- 
2.40.1

[PATCH 1/1] char: ipmi: handle HAS_IOPORT dependencies

[Niklas Schnelle]

In a future patch HAS_IOPORT=n will disable inb()/outb() and friends at
compile time. We thus need to add this dependency and ifdef sections of
code using inb()/outb() as alternative access methods.

Acked-by: Corey Minyard <cminyard@mvista.com>
Co-developed-by: Arnd Bergmann <arnd@kernel.org>
Signed-off-by: Arnd Bergmann <arnd@kernel.org>
Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>
---
Note: This patch does not depend any not-yet-mainline HAS_IOPORT changes
and may be merged via subsystem specific trees at your earliest
convenience.

 drivers/char/ipmi/Makefile       | 11 ++++-------
 drivers/char/ipmi/ipmi_si_intf.c |  3 ++-
 drivers/char/ipmi/ipmi_si_pci.c  |  3 +++
 3 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/drivers/char/ipmi/Makefile b/drivers/char/ipmi/Makefile
index cb6138b8ded9..e0944547c9d0 100644
--- a/drivers/char/ipmi/Makefile
+++ b/drivers/char/ipmi/Makefile
@@ -5,13 +5,10 @@
 
 ipmi_si-y := ipmi_si_intf.o ipmi_kcs_sm.o ipmi_smic_sm.o ipmi_bt_sm.o \
 	ipmi_si_hotmod.o ipmi_si_hardcode.o ipmi_si_platform.o \
-	ipmi_si_port_io.o ipmi_si_mem_io.o
-ifdef CONFIG_PCI
-ipmi_si-y += ipmi_si_pci.o
-endif
-ifdef CONFIG_PARISC
-ipmi_si-y += ipmi_si_parisc.o
-endif
+	ipmi_si_mem_io.o
+ipmi_si-$(CONFIG_HAS_IOPORT) += ipmi_si_port_io.o
+ipmi_si-$(CONFIG_PCI) += ipmi_si_pci.o
+ipmi_si-$(CONFIG_PARISC) += ipmi_si_parisc.o
 
 obj-$(CONFIG_IPMI_HANDLER) += ipmi_msghandler.o
 obj-$(CONFIG_IPMI_DEVICE_INTERFACE) += ipmi_devintf.o
diff --git a/drivers/char/ipmi/ipmi_si_intf.c b/drivers/char/ipmi/ipmi_si_intf.c
index 5cd031f3fc97..eea23a3b966e 100644
--- a/drivers/char/ipmi/ipmi_si_intf.c
+++ b/drivers/char/ipmi/ipmi_si_intf.c
@@ -1882,7 +1882,8 @@ int ipmi_si_add_smi(struct si_sm_io *io)
 	}
 
 	if (!io->io_setup) {
-		if (io->addr_space == IPMI_IO_ADDR_SPACE) {
+		if (IS_ENABLED(CONFIG_HAS_IOPORT) &&
+		    io->addr_space == IPMI_IO_ADDR_SPACE) {
 			io->io_setup = ipmi_si_port_setup;
 		} else if (io->addr_space == IPMI_MEM_ADDR_SPACE) {
 			io->io_setup = ipmi_si_mem_setup;
diff --git a/drivers/char/ipmi/ipmi_si_pci.c b/drivers/char/ipmi/ipmi_si_pci.c
index 74fa2055868b..b83d55685b22 100644
--- a/drivers/char/ipmi/ipmi_si_pci.c
+++ b/drivers/char/ipmi/ipmi_si_pci.c
@@ -97,6 +97,9 @@ static int ipmi_pci_probe(struct pci_dev *pdev,
 	}
 
 	if (pci_resource_flags(pdev, 0) & IORESOURCE_IO) {
+		if (!IS_ENABLED(CONFIG_HAS_IOPORT))
+			return -ENXIO;
+
 		io.addr_space = IPMI_IO_ADDR_SPACE;
 		io.io_setup = ipmi_si_port_setup;
 	} else {
-- 
2.40.1

Re: [PATCH 0/1] char: ipmi: Handle HAS_IOPORT dependencies

[Corey Minyard]

On Thu, Apr 04, 2024 at 12:45:05PM +0200, Niklas Schnelle wrote:
> Hi Corey,
> 
> This is a follow up in my ongoing effort of making inb()/outb() and
> similar I/O port accessors compile-time optional. Previously I sent this
> as a treewide series titled "treewide: Remove I/O port accessors for
> HAS_IOPORT=n" with the latest being its 5th version[0]. With a significant
> subset of patches merged I've changed over to per-subsystem series. These
> series are stand alone and should be merged via the relevant tree such
> that with all subsystems complete we can follow this up with the final
> patch that will make the I/O port accessors compile-time optional.
> 
> The current state of the full series with changes to the remaining
> subsystems and the aforementioned final patch can be found for your
> convenience on my git.kernel.org tree in the has_ioport_v6 branch[1] with
> signed tags. As for compile-time vs runtime see Linus' reply to my first
> attempt[2].

Sorry, my bad, I've been out a lot recently and dealing with a bunch of
issues and I missed this.

It's in my tree now and it looks good.

-corey

> 
> Thanks,
> Niklas
> 
> [0] https://lore.kernel.org/all/20230522105049.1467313-1-schnelle@linux.ibm.com/
> [1] https://git.kernel.org/pub/scm/linux/kernel/git/niks/linux.git/log/?h=has_ioport_v6
> [2] https://lore.kernel.org/lkml/CAHk-=wg80je=K7madF4e7WrRNp37e3qh6y10Svhdc7O8SZ_-8g@mail.gmail.com/
> 
> Niklas Schnelle (1):
>   char: ipmi: handle HAS_IOPORT dependencies
> 
>  drivers/char/ipmi/Makefile       | 11 ++++-------
>  drivers/char/ipmi/ipmi_si_intf.c |  3 ++-
>  drivers/char/ipmi/ipmi_si_pci.c  |  3 +++
>  3 files changed, 9 insertions(+), 8 deletions(-)
> 
> -- 
> 2.40.1
>