From: Russell King - ARM Linux <linux@arm.linux.org.uk> To: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Cc: linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v3 1/2] omap3: iovmm: Work around sg_alloc_table size limitation in IOMMU Date: Wed, 1 Jun 2011 14:43:38 +0100 [thread overview] Message-ID: <20110601134338.GB6700@n2100.arm.linux.org.uk> (raw) In-Reply-To: <1306935012-12406-1-git-send-email-laurent.pinchart@ideasonboard.com> On Wed, Jun 01, 2011 at 03:30:11PM +0200, Laurent Pinchart wrote: > sg_alloc_table can only allocate multi-page scatter-gather list tables > if the architecture supports scatter-gather lists chaining. ARM doesn't > fit in that category. Let's fix this properly, as I've said countless times and so far no one has bothered to sort this out: 8<---- From: Russell King <rmk+kernel@arm.linux.org.uk> Subject: ARM: Allow SoCs to enable scatterlist chaining Allow SoCs to enable the scatterlist chaining support, which allows scatterlist tables to be broken up into smaller allocations. As support for this feature depends on the implementation details of the users of the scatterlists, we can't enable this globally without auditing all the users, which is a very big task. Instead, let SoCs progressively switch over to using this. SoC drivers using scatterlists and SoC DMA implementations need auditing before this option can be enabled for the SoC. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> --- arch/arm/Kconfig | 3 +++ arch/arm/include/asm/scatterlist.h | 4 ++++ 2 files changed, 7 insertions(+), 0 deletions(-) diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 9adc278..cc0dcbf 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -37,6 +37,9 @@ config ARM Europe. There is an ARM Linux project with a web page at <http://www.arm.linux.org.uk/>. +config ARM_HAS_SG_CHAIN + bool + config HAVE_PWM bool diff --git a/arch/arm/include/asm/scatterlist.h b/arch/arm/include/asm/scatterlist.h index 2f87870..cefdb8f 100644 --- a/arch/arm/include/asm/scatterlist.h +++ b/arch/arm/include/asm/scatterlist.h @@ -1,6 +1,10 @@ #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>
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From: linux@arm.linux.org.uk (Russell King - ARM Linux) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v3 1/2] omap3: iovmm: Work around sg_alloc_table size limitation in IOMMU Date: Wed, 1 Jun 2011 14:43:38 +0100 [thread overview] Message-ID: <20110601134338.GB6700@n2100.arm.linux.org.uk> (raw) In-Reply-To: <1306935012-12406-1-git-send-email-laurent.pinchart@ideasonboard.com> On Wed, Jun 01, 2011 at 03:30:11PM +0200, Laurent Pinchart wrote: > sg_alloc_table can only allocate multi-page scatter-gather list tables > if the architecture supports scatter-gather lists chaining. ARM doesn't > fit in that category. Let's fix this properly, as I've said countless times and so far no one has bothered to sort this out: 8<---- From: Russell King <rmk+kernel@arm.linux.org.uk> Subject: ARM: Allow SoCs to enable scatterlist chaining Allow SoCs to enable the scatterlist chaining support, which allows scatterlist tables to be broken up into smaller allocations. As support for this feature depends on the implementation details of the users of the scatterlists, we can't enable this globally without auditing all the users, which is a very big task. Instead, let SoCs progressively switch over to using this. SoC drivers using scatterlists and SoC DMA implementations need auditing before this option can be enabled for the SoC. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> --- arch/arm/Kconfig | 3 +++ arch/arm/include/asm/scatterlist.h | 4 ++++ 2 files changed, 7 insertions(+), 0 deletions(-) diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 9adc278..cc0dcbf 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -37,6 +37,9 @@ config ARM Europe. There is an ARM Linux project with a web page at <http://www.arm.linux.org.uk/>. +config ARM_HAS_SG_CHAIN + bool + config HAVE_PWM bool diff --git a/arch/arm/include/asm/scatterlist.h b/arch/arm/include/asm/scatterlist.h index 2f87870..cefdb8f 100644 --- a/arch/arm/include/asm/scatterlist.h +++ b/arch/arm/include/asm/scatterlist.h @@ -1,6 +1,10 @@ #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>
next prev parent reply other threads:[~2011-06-01 13:43 UTC|newest] Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top 2011-05-30 12:47 [PATCH 0/2] OMAP3 IOMMU fixes Laurent Pinchart 2011-05-30 12:47 ` [PATCH 1/2] omap3: iovmm: Work around sg_alloc_table size limitation in IOMMU Laurent Pinchart 2011-05-31 13:22 ` Tony Lindgren 2011-06-01 12:25 ` [PATCH v2 " Laurent Pinchart 2011-06-01 13:11 ` Tony Lindgren 2011-06-01 12:25 ` [PATCH v2 2/2] omap3: iovmm: Support non page-aligned buffers in iommu_vmap Laurent Pinchart 2011-06-01 12:50 ` Tony Lindgren 2011-06-01 13:09 ` Laurent Pinchart 2011-06-01 13:10 ` Tony Lindgren 2011-06-01 13:17 ` Tony Lindgren 2011-06-01 13:30 ` [PATCH v3 1/2] omap3: iovmm: Work around sg_alloc_table size limitation in IOMMU Laurent Pinchart 2011-06-01 13:30 ` Laurent Pinchart 2011-06-01 13:43 ` Russell King - ARM Linux [this message] 2011-06-01 13:43 ` Russell King - ARM Linux 2011-06-01 13:50 ` Laurent Pinchart 2011-06-01 13:50 ` Laurent Pinchart 2011-06-01 14:03 ` Russell King - ARM Linux 2011-06-01 14:03 ` Russell King - ARM Linux 2011-06-03 0:12 ` Laurent Pinchart 2011-06-03 0:12 ` Laurent Pinchart 2011-06-03 6:32 ` Russell King - ARM Linux 2011-06-03 6:32 ` Russell King - ARM Linux 2011-06-06 16:23 ` Laurent Pinchart 2011-06-06 16:23 ` Laurent Pinchart 2011-06-06 16:44 ` Russell King - ARM Linux 2011-06-06 16:44 ` Russell King - ARM Linux 2011-06-06 16:54 ` Laurent Pinchart 2011-06-06 16:54 ` Laurent Pinchart 2011-06-06 18:00 ` Russell King - ARM Linux 2011-06-06 18:00 ` Russell King - ARM Linux 2011-06-08 10:33 ` Laurent Pinchart 2011-06-08 10:33 ` Laurent Pinchart 2011-06-03 9:39 ` Felipe Contreras 2011-06-03 9:39 ` Felipe Contreras 2011-06-01 13:30 ` [PATCH v3 2/2] omap3: iovmm: Support non page-aligned buffers in iommu_vmap Laurent Pinchart 2011-06-01 13:30 ` Laurent Pinchart 2011-05-30 12:47 ` [PATCH " Laurent Pinchart 2011-05-30 13:16 ` [PATCH 0/2] OMAP3 IOMMU fixes Hiroshi DOYU 2011-06-08 10:48 ` Laurent Pinchart 2011-06-13 13:40 ` Tony Lindgren 2011-06-13 16:41 ` Laurent Pinchart 2011-06-13 19:34 ` Ohad Ben-Cohen
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