[PATCH v4 3/3] asm-generic: Add new pci.h and use it

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* [PATCH v4 3/3] asm-generic: Add new pci.h and use it
       [not found] <20220720131934.373932-1-shorne@gmail.com>
@ 2022-07-20 13:19 ` Stafford Horne
  2022-07-20 15:12   ` Arnd Bergmann
                     ` (2 more replies)
  0 siblings, 3 replies; 4+ messages in thread
From: Stafford Horne @ 2022-07-20 13:19 UTC (permalink / raw)
  To: LKML
  Cc: Arnd Bergmann, Stafford Horne, Pierre Morel, Geert Uytterhoeven,
	Catalin Marinas, Will Deacon, Guo Ren, Paul Walmsley,
	Palmer Dabbelt, Albert Ou, Richard Weinberger, Anton Ivanov,
	Johannes Berg, Bjorn Helgaas, linux-arm-kernel, linux-csky,
	linux-riscv, linux-um, linux-pci, linux-arch

The asm/pci.h used for many newer architectures share similar
definitions.  Move the common parts to asm-generic/pci.h to allow for
sharing code.

One thing to note:

 - ARCH_GENERIC_PCI_MMAP_RESOURCE, csky does not define this so we
   undefine it after including asm-generic/pci.h.  Why doesn't csky
   define it?

Suggested-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/lkml/CAK8P3a0JmPeczfmMBE__vn=Jbvf=nkbpVaZCycyv40pZNCJJXQ@mail.gmail.com/
Acked-by: Pierre Morel <pmorel@linux.ibm.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Stafford Horne <shorne@gmail.com>
---
Since v3:
 - Remove notes about pci_get_legacy_ide_irq and isa_dma_bridge_buggy.
 - Change ifdef around pci_proc_domain to use CONFIG_PCI_DOMAINS to avoid
   compile failure on User Mode linux.

 arch/arm64/include/asm/pci.h | 12 ++----------
 arch/csky/include/asm/pci.h  | 24 ++++--------------------
 arch/riscv/include/asm/pci.h | 25 +++----------------------
 arch/um/include/asm/pci.h    | 24 ++----------------------
 include/asm-generic/pci.h    | 32 ++++++++++++++++++++++++++++++++
 5 files changed, 43 insertions(+), 74 deletions(-)
 create mode 100644 include/asm-generic/pci.h

diff --git a/arch/arm64/include/asm/pci.h b/arch/arm64/include/asm/pci.h
index 0aebc3488c32..016eb6b46dc0 100644
--- a/arch/arm64/include/asm/pci.h
+++ b/arch/arm64/include/asm/pci.h
@@ -9,7 +9,6 @@
 #include <asm/io.h>
 
 #define PCIBIOS_MIN_IO		0x1000
-#define PCIBIOS_MIN_MEM		0
 
 /*
  * Set to 1 if the kernel should re-assign all PCI bus numbers
@@ -18,15 +17,8 @@
 	(pci_has_flag(PCI_REASSIGN_ALL_BUS))
 
 #define arch_can_pci_mmap_wc() 1
-#define ARCH_GENERIC_PCI_MMAP_RESOURCE	1
 
-extern int isa_dma_bridge_buggy;
-
-#ifdef CONFIG_PCI
-static inline int pci_proc_domain(struct pci_bus *bus)
-{
-	return 1;
-}
-#endif  /* CONFIG_PCI */
+/* Generic PCI */
+#include <asm-generic/pci.h>
 
 #endif  /* __ASM_PCI_H */
diff --git a/arch/csky/include/asm/pci.h b/arch/csky/include/asm/pci.h
index ebc765b1f78b..44866c1ad461 100644
--- a/arch/csky/include/asm/pci.h
+++ b/arch/csky/include/asm/pci.h
@@ -9,26 +9,10 @@
 
 #include <asm/io.h>
 
-#define PCIBIOS_MIN_IO		0
-#define PCIBIOS_MIN_MEM		0
+/* Generic PCI */
+#include <asm-generic/pci.h>
 
-/* C-SKY shim does not initialize PCI bus */
-#define pcibios_assign_all_busses() 1
-
-extern int isa_dma_bridge_buggy;
-
-#ifdef CONFIG_PCI
-static inline int pci_get_legacy_ide_irq(struct pci_dev *dev, int channel)
-{
-	/* no legacy IRQ on csky */
-	return -ENODEV;
-}
-
-static inline int pci_proc_domain(struct pci_bus *bus)
-{
-	/* always show the domain in /proc */
-	return 1;
-}
-#endif  /* CONFIG_PCI */
+/* csky doesn't use generic pci resource mapping */
+#undef ARCH_GENERIC_PCI_MMAP_RESOURCE
 
 #endif  /* __ASM_CSKY_PCI_H */
diff --git a/arch/riscv/include/asm/pci.h b/arch/riscv/include/asm/pci.h
index 7fd52a30e605..12ce8150cfb0 100644
--- a/arch/riscv/include/asm/pci.h
+++ b/arch/riscv/include/asm/pci.h
@@ -12,29 +12,7 @@
 
 #include <asm/io.h>
 
-#define PCIBIOS_MIN_IO		0
-#define PCIBIOS_MIN_MEM		0
-
-/* RISC-V shim does not initialize PCI bus */
-#define pcibios_assign_all_busses() 1
-
-#define ARCH_GENERIC_PCI_MMAP_RESOURCE 1
-
-extern int isa_dma_bridge_buggy;
-
 #ifdef CONFIG_PCI
-static inline int pci_get_legacy_ide_irq(struct pci_dev *dev, int channel)
-{
-	/* no legacy IRQ on risc-v */
-	return -ENODEV;
-}
-
-static inline int pci_proc_domain(struct pci_bus *bus)
-{
-	/* always show the domain in /proc */
-	return 1;
-}
-
 #ifdef	CONFIG_NUMA
 
 static inline int pcibus_to_node(struct pci_bus *bus)
@@ -50,4 +28,7 @@ static inline int pcibus_to_node(struct pci_bus *bus)
 
 #endif  /* CONFIG_PCI */
 
+/* Generic PCI */
+#include <asm-generic/pci.h>
+
 #endif  /* _ASM_RISCV_PCI_H */
diff --git a/arch/um/include/asm/pci.h b/arch/um/include/asm/pci.h
index da13fd5519ef..34fe4921b5fa 100644
--- a/arch/um/include/asm/pci.h
+++ b/arch/um/include/asm/pci.h
@@ -4,28 +4,8 @@
 #include <linux/types.h>
 #include <asm/io.h>
 
-#define PCIBIOS_MIN_IO		0
-#define PCIBIOS_MIN_MEM		0
-
-#define pcibios_assign_all_busses() 1
-
-extern int isa_dma_bridge_buggy;
-
-#ifdef CONFIG_PCI
-static inline int pci_get_legacy_ide_irq(struct pci_dev *dev, int channel)
-{
-	/* no legacy IRQs */
-	return -ENODEV;
-}
-#endif
-
-#ifdef CONFIG_PCI_DOMAINS
-static inline int pci_proc_domain(struct pci_bus *bus)
-{
-	/* always show the domain in /proc */
-	return 1;
-}
-#endif  /* CONFIG_PCI */
+/* Generic PCI */
+#include <asm-generic/pci.h>
 
 #ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
 /*
diff --git a/include/asm-generic/pci.h b/include/asm-generic/pci.h
new file mode 100644
index 000000000000..3ceb0cb12321
--- /dev/null
+++ b/include/asm-generic/pci.h
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef __ASM_GENERIC_PCI_H
+#define __ASM_GENERIC_PCI_H
+
+#include <linux/types.h>
+
+#ifndef PCIBIOS_MIN_IO
+#define PCIBIOS_MIN_IO		0
+#endif
+
+#ifndef PCIBIOS_MIN_MEM
+#define PCIBIOS_MIN_MEM		0
+#endif
+
+#ifndef pcibios_assign_all_busses
+/* For bootloaders that do not initialize the PCI bus */
+#define pcibios_assign_all_busses() 1
+#endif
+
+/* Enable generic resource mapping code in drivers/pci/ */
+#define ARCH_GENERIC_PCI_MMAP_RESOURCE
+
+#ifdef CONFIG_PCI_DOMAINS
+static inline int pci_proc_domain(struct pci_bus *bus)
+{
+	/* always show the domain in /proc */
+	return 1;
+}
+#endif /* CONFIG_PCI_DOMAINS */
+
+#endif /* __ASM_GENERIC_PCI_H */
-- 
2.36.1


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^ permalink raw reply related	[flat|nested] 4+ messages in thread

* Re: [PATCH v4 3/3] asm-generic: Add new pci.h and use it
  2022-07-20 13:19 ` [PATCH v4 3/3] asm-generic: Add new pci.h and use it Stafford Horne
@ 2022-07-20 15:12   ` Arnd Bergmann
  2022-07-20 17:43   ` Christoph Hellwig
  2022-07-20 22:42   ` Bjorn Helgaas
  2 siblings, 0 replies; 4+ messages in thread
From: Arnd Bergmann @ 2022-07-20 15:12 UTC (permalink / raw)
  To: Stafford Horne
  Cc: LKML, Arnd Bergmann, Pierre Morel, Geert Uytterhoeven,
	Catalin Marinas, Will Deacon, Guo Ren, Paul Walmsley,
	Palmer Dabbelt, Albert Ou, Richard Weinberger, Anton Ivanov,
	Johannes Berg, Bjorn Helgaas, Linux ARM, linux-csky, linux-riscv,
	linux-um, linux-pci, linux-arch

On Wed, Jul 20, 2022 at 3:19 PM Stafford Horne <shorne@gmail.com> wrote:
>
> The asm/pci.h used for many newer architectures share similar
> definitions.  Move the common parts to asm-generic/pci.h to allow for
> sharing code.
>
> One thing to note:
>
>  - ARCH_GENERIC_PCI_MMAP_RESOURCE, csky does not define this so we
>    undefine it after including asm-generic/pci.h.  Why doesn't csky
>    define it?

If you want to resolve this, I think the easiest way is to add a patch
that sets this
in csky, I'm quite sure this was just a mistake on their end.

> Suggested-by: Arnd Bergmann <arnd@arndb.de>
> Link: https://lore.kernel.org/lkml/CAK8P3a0JmPeczfmMBE__vn=Jbvf=nkbpVaZCycyv40pZNCJJXQ@mail.gmail.com/
> Acked-by: Pierre Morel <pmorel@linux.ibm.com>
> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
> Signed-off-by: Stafford Horne <shorne@gmail.com>

Either way:

Reviewed-by: Arnd Bergmann <arnd@arndb.de>

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^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: [PATCH v4 3/3] asm-generic: Add new pci.h and use it
  2022-07-20 13:19 ` [PATCH v4 3/3] asm-generic: Add new pci.h and use it Stafford Horne
  2022-07-20 15:12   ` Arnd Bergmann
@ 2022-07-20 17:43   ` Christoph Hellwig
  2022-07-20 22:42   ` Bjorn Helgaas
  2 siblings, 0 replies; 4+ messages in thread
From: Christoph Hellwig @ 2022-07-20 17:43 UTC (permalink / raw)
  To: Stafford Horne
  Cc: LKML, Arnd Bergmann, Pierre Morel, Geert Uytterhoeven,
	Catalin Marinas, Will Deacon, Guo Ren, Paul Walmsley,
	Palmer Dabbelt, Albert Ou, Richard Weinberger, Anton Ivanov,
	Johannes Berg, Bjorn Helgaas, linux-arm-kernel, linux-csky,
	linux-riscv, linux-um, linux-pci, linux-arch

Looks good:

Reviewed-by: Christoph Hellwig <hch@lst.de>

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^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: [PATCH v4 3/3] asm-generic: Add new pci.h and use it
  2022-07-20 13:19 ` [PATCH v4 3/3] asm-generic: Add new pci.h and use it Stafford Horne
  2022-07-20 15:12   ` Arnd Bergmann
  2022-07-20 17:43   ` Christoph Hellwig
@ 2022-07-20 22:42   ` Bjorn Helgaas
  2 siblings, 0 replies; 4+ messages in thread
From: Bjorn Helgaas @ 2022-07-20 22:42 UTC (permalink / raw)
  To: Stafford Horne
  Cc: LKML, Arnd Bergmann, Pierre Morel, Geert Uytterhoeven,
	Catalin Marinas, Will Deacon, Guo Ren, Paul Walmsley,
	Palmer Dabbelt, Albert Ou, Richard Weinberger, Anton Ivanov,
	Johannes Berg, Bjorn Helgaas, linux-arm-kernel, linux-csky,
	linux-riscv, linux-um, linux-pci, linux-arch

On Wed, Jul 20, 2022 at 10:19:34PM +0900, Stafford Horne wrote:
> The asm/pci.h used for many newer architectures share similar
> definitions.  Move the common parts to asm-generic/pci.h to allow for
> sharing code.
> 
> One thing to note:
> 
>  - ARCH_GENERIC_PCI_MMAP_RESOURCE, csky does not define this so we
>    undefine it after including asm-generic/pci.h.  Why doesn't csky
>    define it?
> 
> Suggested-by: Arnd Bergmann <arnd@arndb.de>
> Link: https://lore.kernel.org/lkml/CAK8P3a0JmPeczfmMBE__vn=Jbvf=nkbpVaZCycyv40pZNCJJXQ@mail.gmail.com/
> Acked-by: Pierre Morel <pmorel@linux.ibm.com>
> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
> Signed-off-by: Stafford Horne <shorne@gmail.com>

> diff --git a/arch/arm64/include/asm/pci.h b/arch/arm64/include/asm/pci.h
> index 0aebc3488c32..016eb6b46dc0 100644
> --- a/arch/arm64/include/asm/pci.h
> +++ b/arch/arm64/include/asm/pci.h

> -extern int isa_dma_bridge_buggy;

Shouldn't this go in the previous patch?  The only definition of a
isa_dma_bridge_buggy variable is in drivers/pci/pci.c, and it's under
#ifdef CONFIG_X86_32.

Same for csky, riscv, um?

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^ permalink raw reply	[flat|nested] 4+ messages in thread

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2022-07-20 13:19 ` [PATCH v4 3/3] asm-generic: Add new pci.h and use it Stafford Horne
2022-07-20 15:12   ` Arnd Bergmann
2022-07-20 17:43   ` Christoph Hellwig
2022-07-20 22:42   ` Bjorn Helgaas

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