On Tue, Jul 19, 2022 at 08:58:39AM -0700, Palmer Dabbelt wrote: > On Sun, 17 Jul 2022 17:41:14 PDT (-0700), shorne@xxxxxxxxx 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. > > > > Two things to note are: > > > > - isa_dma_bridge_buggy, traditionally this is defined in asm/dma.h but > > these architectures avoid creating that file and add the definition > > to asm/pci.h. > > - 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? > > - pci_get_legacy_ide_irq, This function is only used on architectures > > that support PNP. It is only maintained for arm64, in other > > architectures it is removed. > > > > Suggested-by: Arnd Bergmann <arnd@xxxxxxxx> > > Link: https://lore.kernel.org/lkml/CAK8P3a0JmPeczfmMBE__vn=Jbvf=nkbpVaZCycyv40pZNCJJXQ@xxxxxxxxxxxxxx/ > > Signed-off-by: Stafford Horne <shorne@xxxxxxxxx> > > --- > > Second note on isa_dma_bridge_buggy, this is set on x86 but it it also set in > > pci/quirks.c. We discussed limiting it only to x86 though as its a general > > quick triggered by pci ids I think it will be more tricky than we thought so I > > will leave as is. It might be nice to move it out of asm/dma.h and into > > asm/pci.h though. > > > > Since v2: > > - Nothing > > Since v1: > > - Remove definition of pci_get_legacy_ide_irq > > > > 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 | 36 ++++++++++++++++++++++++++++++++++++ > > 5 files changed, 48 insertions(+), 73 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 b33ca260e3c9..1180e83712f5 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 > > @@ -18,9 +17,6 @@ > > (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_get_legacy_ide_irq(struct pci_dev *dev, int channel) > > @@ -28,11 +24,9 @@ static inline int pci_get_legacy_ide_irq(struct pci_dev *dev, int channel) > > /* no legacy IRQ on arm64 */ > > return -ENODEV; > > } > > - > > -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 > > My for-next changes these in bb356ddb78b2 ("RISC-V: PCI: Avoid handing out > address 0 to devices"). Do you mind either splitting out the arch/riscv > bits or having this in via some sort of shared tag? Hi Palmer, I replied last on my phone but since it produces HTML multi-part email it got rejected from a few places and I am not sure if you saw my reply. It might be a bit hard to separate out the architecture specific bits as it requires a bit of coordination with the asm-generic/pci.h move. Some options: 1 I can produce a tag for you to merge into your for-next. 2 I can skip touching riscv at all in this patch and you can take care of it in a future patch. 3 I could cherry pick your change bb356ddb78b2 ("RISC-V: PCI: Avoid handing out address 0 to devices") to my for-next branch. It should help avoid conflict. Seeing that I am still doing small updates here and there I am not sure when I will be ablt to create a stable tag. So maybe 3 would work best? -Stafford
