From: will.deacon@arm•com (Will Deacon)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH] arm64: Add ARCH_HAS_SG_CHAIN
Date: Fri, 14 Mar 2014 10:05:45 +0000 [thread overview]
Message-ID: <20140314100545.GB13541@arm.com> (raw)
In-Reply-To: <53225261.7080608@codeaurora.org>
Hi Laura,
On Fri, Mar 14, 2014 at 12:50:41AM +0000, Laura Abbott wrote:
> On 3/13/2014 11:01 AM, Will Deacon wrote:
> > On Thu, Mar 13, 2014 at 05:49:23PM +0000, Laura Abbott wrote:
> >> It's useful to be able to chain scatterlists together for very large
> >> scatter allocations. Define ARCH_HAS_SG_CHAIN to let this happen.
> >>
> >> Signed-off-by: Laura Abbott <lauraa@codeaurora•org>
> >> ---
> >> arch/arm64/include/asm/scatterlist.h | 21 +++++++++++++++++++++
> >> 1 file changed, 21 insertions(+)
> >> create mode 100644 arch/arm64/include/asm/scatterlist.h
[...]
> >> +#ifndef __ASM_SCATTERLIST_H
> >> +#define __ASM_SCATTERLIST_H
> >> +
> >> +#include <asm-generic/scatterlist.h>
> >> +
> >> +#define ARCH_HAS_SG_CHAIN
> >
> > Hmm, I wonder if this should be a Kconfig option instead, to avoid the need
> > for the dummy header?
> >
> > Will
> >
>
> Yeah, it does seem non-standard at this point. Something like the
> following perhaps?
Yes, that looks like the right sort of thing, thanks.
Acked-by: Will Deacon <will.deacon@arm•com>
Probably easiest to merge via akpm if you can get some more acks.
Will
> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> index 1594945..8122294 100644
> --- a/arch/arm/Kconfig
> +++ b/arch/arm/Kconfig
> @@ -82,6 +82,7 @@ config ARM
> <http://www.arm.linux.org.uk/>.
>
> config ARM_HAS_SG_CHAIN
> + select ARCH_HAS_SG_CHAIN
> bool
>
> config NEED_SG_DMA_LENGTH
> diff --git a/arch/arm/include/asm/scatterlist.h
> b/arch/arm/include/asm/scatterlist.h
> index cefdb8f..2f87870 100644
> --- a/arch/arm/include/asm/scatterlist.h
> +++ b/arch/arm/include/asm/scatterlist.h
> @@ -1,10 +1,6 @@
> #ifndef _ASMARM_SCATTERLIST_H
> #define _ASMARM_SCATTERLIST_H
>
> -#ifdef CONFIG_ARM_HAS_SG_CHAIN
> -#define ARCH_HAS_SG_CHAIN
> -#endif
> -
> #include <asm/memory.h>
> #include <asm/types.h>
> #include <asm-generic/scatterlist.h>
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index 27bbcfc..f2f95f4 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -2,6 +2,7 @@ config ARM64
> def_bool y
> select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
> select ARCH_USE_CMPXCHG_LOCKREF
> + select ARCH_HAS_SG_CHAIN
> select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
> select ARCH_WANT_OPTIONAL_GPIOLIB
> select ARCH_WANT_COMPAT_IPC_PARSE_VERSION
> diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
> index 0c8e553..13e2e8b 100644
> --- a/arch/ia64/Kconfig
> +++ b/arch/ia64/Kconfig
> @@ -44,6 +44,7 @@ config IA64
> select HAVE_MOD_ARCH_SPECIFIC
> select MODULES_USE_ELF_RELA
> select ARCH_USE_CMPXCHG_LOCKREF
> + select ARCH_HAS_SG_CHAIN
> default y
> help
> The Itanium Processor Family is Intel's 64-bit successor to
> diff --git a/arch/ia64/include/asm/scatterlist.h
> b/arch/ia64/include/asm/scatterlist.h
> index 08fd93b..c19b59d 100644
> --- a/arch/ia64/include/asm/scatterlist.h
> +++ b/arch/ia64/include/asm/scatterlist.h
> @@ -2,6 +2,5 @@
> #define _ASM_IA64_SCATTERLIST_H
>
> #include <asm-generic/scatterlist.h>
> -#define ARCH_HAS_SG_CHAIN
>
> #endif /* _ASM_IA64_SCATTERLIST_H */
> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
> index 957bf34..659aee2 100644
> --- a/arch/powerpc/Kconfig
> +++ b/arch/powerpc/Kconfig
> @@ -141,6 +141,7 @@ config PPC
> select HAVE_DEBUG_STACKOVERFLOW
> select HAVE_IRQ_EXIT_ON_IRQ_STACK
> select ARCH_USE_CMPXCHG_LOCKREF if PPC64
> + select ARCH_HAS_SG_CHAIN
>
> config GENERIC_CSUM
> def_bool CPU_LITTLE_ENDIAN
> diff --git a/arch/powerpc/include/asm/scatterlist.h
> b/arch/powerpc/include/asm/scatterlist.h
> index de1f620..1f51af5 100644
> --- a/arch/powerpc/include/asm/scatterlist.h
> +++ b/arch/powerpc/include/asm/scatterlist.h
> @@ -12,6 +12,4 @@
> #include <asm/dma.h>
> #include <asm-generic/scatterlist.h>
>
> -#define ARCH_HAS_SG_CHAIN
> -
> #endif /* _ASM_POWERPC_SCATTERLIST_H */
> diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
> index 65a0775..d6c2059 100644
> --- a/arch/s390/Kconfig
> +++ b/arch/s390/Kconfig
> @@ -142,6 +142,7 @@ config S390
> select SYSCTL_EXCEPTION_TRACE
> select VIRT_CPU_ACCOUNTING
> select VIRT_TO_BUS
> + select ARCH_HAS_SG_CHAIN
>
> config SCHED_OMIT_FRAME_POINTER
> def_bool y
> diff --git a/arch/s390/include/asm/scatterlist.h
> b/arch/s390/include/asm/scatterlist.h
> index 6d45ef6..4aaea56 100644
> --- a/arch/s390/include/asm/scatterlist.h
> +++ b/arch/s390/include/asm/scatterlist.h
> @@ -1,3 +1,2 @@
> #include <asm-generic/scatterlist.h>
>
> -#define ARCH_HAS_SG_CHAIN
> diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
> index 7d8b7e9..7a179fe 100644
> --- a/arch/sparc/Kconfig
> +++ b/arch/sparc/Kconfig
> @@ -42,6 +42,7 @@ config SPARC
> select MODULES_USE_ELF_RELA
> select ODD_RT_SIGACTION
> select OLD_SIGSUSPEND
> + select ARCH_HAS_SG_CHAIN
>
> config SPARC32
> def_bool !64BIT
> diff --git a/arch/sparc/include/asm/scatterlist.h
> b/arch/sparc/include/asm/scatterlist.h
> index 92bb638..6eab378 100644
> --- a/arch/sparc/include/asm/scatterlist.h
> +++ b/arch/sparc/include/asm/scatterlist.h
> @@ -3,6 +3,4 @@
>
> #include <asm-generic/scatterlist.h>
>
> -#define ARCH_HAS_SG_CHAIN
> -
> #endif /* !(_SPARC_SCATTERLIST_H) */
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index 0af5250..76997dc 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -127,6 +127,7 @@ config X86
> select HAVE_DEBUG_STACKOVERFLOW
> select HAVE_IRQ_EXIT_ON_IRQ_STACK if X86_64
> select HAVE_CC_STACKPROTECTOR
> + select ARCH_HAS_SG_CHAIN
>
> config INSTRUCTION_DECODER
> def_bool y
> diff --git a/arch/x86/include/asm/scatterlist.h
> b/arch/x86/include/asm/scatterlist.h
> index 4240878..b08f91d 100644
> --- a/arch/x86/include/asm/scatterlist.h
> +++ b/arch/x86/include/asm/scatterlist.h
> @@ -3,6 +3,4 @@
>
> #include <asm-generic/scatterlist.h>
>
> -#define ARCH_HAS_SG_CHAIN
> -
> #endif /* _ASM_X86_SCATTERLIST_H */
> diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h
> index a964f72..4b152c8 100644
> --- a/include/linux/scatterlist.h
> +++ b/include/linux/scatterlist.h
> @@ -136,7 +136,7 @@ static inline void sg_set_buf(struct scatterlist
> *sg, const void *buf,
> static inline void sg_chain(struct scatterlist *prv, unsigned int
> prv_nents,
> struct scatterlist *sgl)
> {
> -#ifndef ARCH_HAS_SG_CHAIN
> +#ifndef CONFIG_ARCH_HAS_SG_CHAIN
> BUG();
> #endif
>
> diff --git a/include/scsi/scsi.h b/include/scsi/scsi.h
> index 0a4edfe..d34cf2d 100644
> --- a/include/scsi/scsi.h
> +++ b/include/scsi/scsi.h
> @@ -31,7 +31,7 @@ enum scsi_timeouts {
> * Like SCSI_MAX_SG_SEGMENTS, but for archs that have sg chaining.
> This limit
> * is totally arbitrary, a setting of 2048 will get you at least 8mb ios.
> */
> -#ifdef ARCH_HAS_SG_CHAIN
> +#ifdef CONFIG_ARCH_HAS_SG_CHAIN
> #define SCSI_MAX_SG_CHAIN_SEGMENTS 2048
> #else
> #define SCSI_MAX_SG_CHAIN_SEGMENTS SCSI_MAX_SG_SEGMENTS
> diff --git a/lib/Kconfig b/lib/Kconfig
> index 991c98b..32c68d3 100644
> --- a/lib/Kconfig
> +++ b/lib/Kconfig
> @@ -451,4 +451,11 @@ config UCS2_STRING
>
> source "lib/fonts/Kconfig"
>
> +#
> +# sg chaining option
> +#
> +
> +config ARCH_HAS_SG_CHAIN
> + def_bool n
> +
> endmenu
> diff --git a/lib/scatterlist.c b/lib/scatterlist.c
> index 3a8e8e8..4251cbd 100644
> --- a/lib/scatterlist.c
> +++ b/lib/scatterlist.c
> @@ -73,7 +73,7 @@ EXPORT_SYMBOL(sg_nents);
> **/
> struct scatterlist *sg_last(struct scatterlist *sgl, unsigned int nents)
> {
> -#ifndef ARCH_HAS_SG_CHAIN
> +#ifndef CONFIG_ARCH_HAS_SG_CHAIN
> struct scatterlist *ret = &sgl[nents - 1];
> #else
> struct scatterlist *sg, *ret = NULL;
> @@ -251,7 +251,7 @@ int __sg_alloc_table(struct sg_table *table,
> unsigned int nents,
>
> if (nents == 0)
> return -EINVAL;
> -#ifndef ARCH_HAS_SG_CHAIN
> +#ifndef CONFIG_ARCH_HAS_SG_CHAIN
> if (WARN_ON_ONCE(nents > max_ents))
> return -EINVAL;
> #endif
>
> --
> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
> hosted by The Linux Foundation
>
next prev parent reply other threads:[~2014-03-14 10:05 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-13 17:49 [PATCH] arm64: Add ARCH_HAS_SG_CHAIN Laura Abbott
2014-03-13 18:01 ` Will Deacon
2014-03-14 0:50 ` Laura Abbott
2014-03-14 10:05 ` Will Deacon [this message]
2014-03-14 10:16 ` Catalin Marinas
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