[PATCH 0/1] ata: Handle HAS_IOPORT dependencies

[PATCH 0/1] ata: Handle HAS_IOPORT dependencies

[Niklas Schnelle]

Hi Damien, Niklas,

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):
  ata: add HAS_IOPORT dependencies

 drivers/ata/Kconfig      | 28 ++++++++++++++--------------
 drivers/ata/libata-sff.c |  4 ++++
 2 files changed, 18 insertions(+), 14 deletions(-)

-- 
2.40.1

[PATCH 1/1] ata: add 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 HAS_IOPORT as dependency for those
drivers using them.

Co-developed-by: Arnd Bergmann <arnd@kernel.org>
Signed-off-by: Arnd Bergmann <arnd@kernel.org>
Acked-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
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/ata/Kconfig      | 28 ++++++++++++++--------------
 drivers/ata/libata-sff.c |  4 ++++
 2 files changed, 18 insertions(+), 14 deletions(-)

diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index 928ec93c6b45..b595494ab9b4 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -556,7 +556,7 @@ comment "PATA SFF controllers with BMDMA"
 
 config PATA_ALI
 	tristate "ALi PATA support"
-	depends on PCI
+	depends on PCI && HAS_IOPORT
 	select PATA_TIMINGS
 	help
 	  This option enables support for the ALi ATA interfaces
@@ -566,7 +566,7 @@ config PATA_ALI
 
 config PATA_AMD
 	tristate "AMD/NVidia PATA support"
-	depends on PCI
+	depends on PCI && HAS_IOPORT
 	select PATA_TIMINGS
 	help
 	  This option enables support for the AMD and NVidia PATA
@@ -584,7 +584,7 @@ config PATA_ARASAN_CF
 
 config PATA_ARTOP
 	tristate "ARTOP 6210/6260 PATA support"
-	depends on PCI
+	depends on PCI && HAS_IOPORT
 	help
 	  This option enables support for ARTOP PATA controllers.
 
@@ -611,7 +611,7 @@ config PATA_ATP867X
 
 config PATA_CMD64X
 	tristate "CMD64x PATA support"
-	depends on PCI
+	depends on PCI && HAS_IOPORT
 	select PATA_TIMINGS
 	help
 	  This option enables support for the CMD64x series chips
@@ -658,7 +658,7 @@ config PATA_CS5536
 
 config PATA_CYPRESS
 	tristate "Cypress CY82C693 PATA support (Very Experimental)"
-	depends on PCI
+	depends on PCI && HAS_IOPORT
 	select PATA_TIMINGS
 	help
 	  This option enables support for the Cypress/Contaq CY82C693
@@ -706,7 +706,7 @@ config PATA_HPT366
 
 config PATA_HPT37X
 	tristate "HPT 370/370A/371/372/374/302 PATA support"
-	depends on PCI
+	depends on PCI && HAS_IOPORT
 	help
 	  This option enables support for the majority of the later HPT
 	  PATA controllers via the new ATA layer.
@@ -715,7 +715,7 @@ config PATA_HPT37X
 
 config PATA_HPT3X2N
 	tristate "HPT 371N/372N/302N PATA support"
-	depends on PCI
+	depends on PCI && HAS_IOPORT
 	help
 	  This option enables support for the N variant HPT PATA
 	  controllers via the new ATA layer.
@@ -818,7 +818,7 @@ config PATA_MPC52xx
 
 config PATA_NETCELL
 	tristate "NETCELL Revolution RAID support"
-	depends on PCI
+	depends on PCI && HAS_IOPORT
 	help
 	  This option enables support for the Netcell Revolution RAID
 	  PATA controller.
@@ -854,7 +854,7 @@ config PATA_OLDPIIX
 
 config PATA_OPTIDMA
 	tristate "OPTI FireStar PATA support (Very Experimental)"
-	depends on PCI
+	depends on PCI && HAS_IOPORT
 	help
 	  This option enables DMA/PIO support for the later OPTi
 	  controllers found on some old motherboards and in some
@@ -864,7 +864,7 @@ config PATA_OPTIDMA
 
 config PATA_PDC2027X
 	tristate "Promise PATA 2027x support"
-	depends on PCI
+	depends on PCI && HAS_IOPORT
 	help
 	  This option enables support for Promise PATA pdc20268 to pdc20277 host adapters.
 
@@ -872,7 +872,7 @@ config PATA_PDC2027X
 
 config PATA_PDC_OLD
 	tristate "Older Promise PATA controller support"
-	depends on PCI
+	depends on PCI && HAS_IOPORT
 	help
 	  This option enables support for the Promise 20246, 20262, 20263,
 	  20265 and 20267 adapters.
@@ -900,7 +900,7 @@ config PATA_RDC
 
 config PATA_SC1200
 	tristate "SC1200 PATA support"
-	depends on PCI && (X86_32 || COMPILE_TEST)
+	depends on PCI && (X86_32 || COMPILE_TEST) && HAS_IOPORT
 	help
 	  This option enables support for the NatSemi/AMD SC1200 SoC
 	  companion chip used with the Geode processor family.
@@ -918,7 +918,7 @@ config PATA_SCH
 
 config PATA_SERVERWORKS
 	tristate "SERVERWORKS OSB4/CSB5/CSB6/HT1000 PATA support"
-	depends on PCI
+	depends on PCI && HAS_IOPORT
 	help
 	  This option enables support for the Serverworks OSB4/CSB5/CSB6 and
 	  HT1000 PATA controllers, via the new ATA layer.
@@ -1182,7 +1182,7 @@ config ATA_GENERIC
 
 config PATA_LEGACY
 	tristate "Legacy ISA PATA support (Experimental)"
-	depends on (ISA || PCI)
+	depends on (ISA || PCI) && HAS_IOPORT
 	select PATA_TIMINGS
 	help
 	  This option enables support for ISA/VLB/PCI bus legacy PATA
diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c
index 95a19c4ef2a1..250f7dae05fd 100644
--- a/drivers/ata/libata-sff.c
+++ b/drivers/ata/libata-sff.c
@@ -3032,6 +3032,7 @@ EXPORT_SYMBOL_GPL(ata_bmdma_port_start32);
  */
 int ata_pci_bmdma_clear_simplex(struct pci_dev *pdev)
 {
+#ifdef CONFIG_HAS_IOPORT
 	unsigned long bmdma = pci_resource_start(pdev, 4);
 	u8 simplex;
 
@@ -3044,6 +3045,9 @@ int ata_pci_bmdma_clear_simplex(struct pci_dev *pdev)
 	if (simplex & 0x80)
 		return -EOPNOTSUPP;
 	return 0;
+#else
+	return -ENOENT;
+#endif /* CONFIG_HAS_IOPORT */
 }
 EXPORT_SYMBOL_GPL(ata_pci_bmdma_clear_simplex);
 
-- 
2.40.1

Re: [PATCH 1/1] ata: add HAS_IOPORT dependencies

[Niklas Cassel]

On Thu, Apr 04, 2024 at 11:29:36AM +0200, Niklas Schnelle wrote:
> In a future patch HAS_IOPORT=n will disable inb()/outb() and friends at
> compile time. We thus need to add HAS_IOPORT as dependency for those
> drivers using them.
> 
> Co-developed-by: Arnd Bergmann <arnd@kernel.org>
> Signed-off-by: Arnd Bergmann <arnd@kernel.org>
> Acked-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
> Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>
> ---

Reviewed-by: Niklas Cassel <cassel@kernel.org>

Re: [PATCH 1/1] ata: add HAS_IOPORT dependencies

[Damien Le Moal]

On 4/4/24 18:29, Niklas Schnelle wrote:
> In a future patch HAS_IOPORT=n will disable inb()/outb() and friends at
> compile time. We thus need to add HAS_IOPORT as dependency for those
> drivers using them.
> 
> Co-developed-by: Arnd Bergmann <arnd@kernel.org>
> Signed-off-by: Arnd Bergmann <arnd@kernel.org>
> Acked-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
> Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>

Applied to for-6.10. Thanks !

-- 
Damien Le Moal
Western Digital Research