From 14b4d97669b79d1ac83e64d6795098394e15ab1b Mon Sep 17 00:00:00 2001 From: Christophe Leroy Date: Tue, 20 Aug 2019 14:07:13 +0000 Subject: [PATCH] powerpc/mm: rework io-workaround invocation. ppc_md.ioremap() is only used for I/O workaround on CELL platform, so indirect function call can be avoided. This patch reworks the io-workaround and ioremap() functions to use the global 'io_workaround_inited' flag for the activation of io-workaround. When CONFIG_PPC_IO_WORKAROUNDS or CONFIG_PPC_INDIRECT_MMIO are not selected, the I/O workaround ioremap() voids and the global flag is not used. Signed-off-by: Christophe Leroy Reviewed-by: Christoph Hellwig Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/5fa3ef069fbd0f152512afaae19e7a60161454cf.1566309262.git.christophe.leroy@c-s.fr --- arch/powerpc/include/asm/io-workarounds.h | 20 ++++++++++++++++++++ arch/powerpc/include/asm/machdep.h | 2 -- arch/powerpc/kernel/io-workarounds.c | 13 +++++-------- arch/powerpc/mm/pgtable_64.c | 17 +++++++++-------- 4 files changed, 34 insertions(+), 18 deletions(-) diff --git a/arch/powerpc/include/asm/io-workarounds.h b/arch/powerpc/include/asm/io-workarounds.h index 01567ea4..3cce499 100644 --- a/arch/powerpc/include/asm/io-workarounds.h +++ b/arch/powerpc/include/asm/io-workarounds.h @@ -8,6 +8,7 @@ #ifndef _IO_WORKAROUNDS_H #define _IO_WORKAROUNDS_H +#ifdef CONFIG_PPC_IO_WORKAROUNDS #include #include @@ -32,4 +33,23 @@ extern int spiderpci_iowa_init(struct iowa_bus *, void *); #define SPIDER_PCI_DUMMY_READ 0x0810 #define SPIDER_PCI_DUMMY_READ_BASE 0x0814 +#endif + +#if defined(CONFIG_PPC_IO_WORKAROUNDS) && defined(CONFIG_PPC_INDIRECT_MMIO) +extern bool io_workaround_inited; + +static inline bool iowa_is_active(void) +{ + return unlikely(io_workaround_inited); +} +#else +static inline bool iowa_is_active(void) +{ + return false; +} +#endif + +void __iomem *iowa_ioremap(phys_addr_t addr, unsigned long size, + pgprot_t prot, void *caller); + #endif /* _IO_WORKAROUNDS_H */ diff --git a/arch/powerpc/include/asm/machdep.h b/arch/powerpc/include/asm/machdep.h index 3370df4..657ec89 100644 --- a/arch/powerpc/include/asm/machdep.h +++ b/arch/powerpc/include/asm/machdep.h @@ -31,8 +31,6 @@ struct pci_host_bridge; struct machdep_calls { char *name; #ifdef CONFIG_PPC64 - void __iomem * (*ioremap)(phys_addr_t addr, unsigned long size, - pgprot_t prot, void *caller); #ifdef CONFIG_PM void (*iommu_save)(void); void (*iommu_restore)(void); diff --git a/arch/powerpc/kernel/io-workarounds.c b/arch/powerpc/kernel/io-workarounds.c index fbd2d00..0276bc8 100644 --- a/arch/powerpc/kernel/io-workarounds.c +++ b/arch/powerpc/kernel/io-workarounds.c @@ -149,8 +149,8 @@ static const struct ppc_pci_io iowa_pci_io = { }; #ifdef CONFIG_PPC_INDIRECT_MMIO -static void __iomem *iowa_ioremap(phys_addr_t addr, unsigned long size, - pgprot_t prot, void *caller) +void __iomem *iowa_ioremap(phys_addr_t addr, unsigned long size, + pgprot_t prot, void *caller) { struct iowa_bus *bus; void __iomem *res = __ioremap_caller(addr, size, prot, caller); @@ -163,20 +163,17 @@ static void __iomem *iowa_ioremap(phys_addr_t addr, unsigned long size, } return res; } -#else /* CONFIG_PPC_INDIRECT_MMIO */ -#define iowa_ioremap NULL #endif /* !CONFIG_PPC_INDIRECT_MMIO */ +bool io_workaround_inited; + /* Enable IO workaround */ static void io_workaround_init(void) { - static int io_workaround_inited; - if (io_workaround_inited) return; ppc_pci_io = iowa_pci_io; - ppc_md.ioremap = iowa_ioremap; - io_workaround_inited = 1; + io_workaround_inited = true; } /* Register new bus to support workaround */ diff --git a/arch/powerpc/mm/pgtable_64.c b/arch/powerpc/mm/pgtable_64.c index 2882419..0a147da 100644 --- a/arch/powerpc/mm/pgtable_64.c +++ b/arch/powerpc/mm/pgtable_64.c @@ -35,6 +35,7 @@ #include #include #include +#include #include #include #include @@ -208,8 +209,8 @@ void __iomem * ioremap(phys_addr_t addr, unsigned long size) pgprot_t prot = pgprot_noncached(PAGE_KERNEL); void *caller = __builtin_return_address(0); - if (ppc_md.ioremap) - return ppc_md.ioremap(addr, size, prot, caller); + if (iowa_is_active()) + return iowa_ioremap(addr, size, prot, caller); return __ioremap_caller(addr, size, prot, caller); } @@ -218,8 +219,8 @@ void __iomem * ioremap_wc(phys_addr_t addr, unsigned long size) pgprot_t prot = pgprot_noncached_wc(PAGE_KERNEL); void *caller = __builtin_return_address(0); - if (ppc_md.ioremap) - return ppc_md.ioremap(addr, size, prot, caller); + if (iowa_is_active()) + return iowa_ioremap(addr, size, prot, caller); return __ioremap_caller(addr, size, prot, caller); } @@ -228,8 +229,8 @@ void __iomem *ioremap_coherent(phys_addr_t addr, unsigned long size) pgprot_t prot = pgprot_cached(PAGE_KERNEL); void *caller = __builtin_return_address(0); - if (ppc_md.ioremap) - return ppc_md.ioremap(addr, size, prot, caller); + if (iowa_is_active()) + return iowa_ioremap(addr, size, prot, caller); return __ioremap_caller(addr, size, prot, caller); } @@ -250,8 +251,8 @@ void __iomem * ioremap_prot(phys_addr_t addr, unsigned long size, */ pte = pte_mkprivileged(pte); - if (ppc_md.ioremap) - return ppc_md.ioremap(addr, size, pte_pgprot(pte), caller); + if (iowa_is_active()) + return iowa_ioremap(addr, size, pte_pgprot(pte), caller); return __ioremap_caller(addr, size, pte_pgprot(pte), caller); } -- 2.7.4