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powerpc/mm: rework io-workaround invocation.

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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 <christophe.leroy@c-s.fr>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/5fa3ef069fbd0f152512afaae19e7a60161454cf.1566309262.git.christophe.leroy@c-s.fr
This commit is contained in:
Christophe Leroy 2019-08-20 14:07:13 +00:00 committed by Michael Ellerman
parent 492643e81e
commit 14b4d97669
4 changed files with 34 additions and 18 deletions
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20
arch/powerpc/include/asm/io-workarounds.h
View File

@ -8,6 +8,7 @@
#ifndef _IO_WORKAROUNDS_H
#define _IO_WORKAROUNDS_H
#ifdef CONFIG_PPC_IO_WORKAROUNDS
#include <linux/io.h>
#include <asm/pci-bridge.h>
@ -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 */

2
arch/powerpc/include/asm/machdep.h
View File

@ -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);

11
arch/powerpc/kernel/io-workarounds.c
View File

@ -149,7 +149,7 @@ 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,
void __iomem *iowa_ioremap(phys_addr_t addr, unsigned long size,
pgprot_t prot, void *caller)
{
struct iowa_bus *bus;
@ -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 */

17
arch/powerpc/mm/pgtable_64.c
View File

@ -35,6 +35,7 @@
#include <asm/page.h>
#include <asm/prom.h>
#include <asm/io.h>
#include <asm/io-workarounds.h>
#include <asm/mmu_context.h>
#include <asm/pgtable.h>
#include <asm/mmu.h>
@ -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);
}