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Date: Fri, 22 May 2009 20:13:15 +0900
From: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To: ian.campbell@...rix.com
Cc: fujita.tomonori@....ntt.co.jp, jeremy@...p.org,
beckyb@...nel.crashing.org, okir@...e.de, mingo@...e.hu,
gregkh@...e.de, xendevel@...ts.xensource.com, x86@...nel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] swiotlb: make swiotlb allocation functions
architecture-specific
On Thu, 21 May 2009 17:15:25 +0100
Ian Campbell <ian.campbell@...rix.com> wrote:
> Some architectures need to allocate memory to be used as a swiotlb in
> a special manner.
Hmm, what architectures need a special manner? I guess only Xen.
> Also make the swiotlb_late_init_with_default_size() function only
> available on architectures which require it.
>
> Signed-off-by: Ian Campbell <ian.campbell@...rix.com>
> Cc: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
> Cc: Jeremy Fitzhardinge <jeremy@...p.org>
> Cc: Becky Bruce <beckyb@...nel.crashing.org>
> Cc: Olaf Kirch <okir@...e.de>
> Cc: Ingo Molnar <mingo@...e.hu>
> Cc: Greg KH <gregkh@...e.de>
> Cc: xen-devel <xendevel@...ts.xensource.com>
> Cc: x86 maintainers <x86@...nel.org>
> Cc: lkml <linux-kernel@...r.kernel.org>
> ---
> arch/ia64/include/asm/dma-mapping.h | 5 +++++
> arch/ia64/kernel/pci-swiotlb.c | 11 +++++++++++
> arch/x86/include/asm/dma-mapping.h | 4 ++++
> arch/x86/kernel/pci-swiotlb.c | 12 ++++++++++++
> arch/x86/xen/pci-swiotlb.c | 17 -----------------
> include/linux/swiotlb.h | 3 ---
> lib/swiotlb.c | 12 ++----------
> 7 files changed, 34 insertions(+), 30 deletions(-)
>
> diff --git a/arch/ia64/include/asm/dma-mapping.h b/arch/ia64/include/asm/dma-mapping.h
> index 3e8fb31..9f9994d 100644
> --- a/arch/ia64/include/asm/dma-mapping.h
> +++ b/arch/ia64/include/asm/dma-mapping.h
> @@ -185,4 +185,9 @@ static inline int swiotlb_force_mapping(phys_addr_t paddr, size_t size)
> return 0;
> }
>
> +#define SWIOTLB_WANT_LATE_INIT 1
> +
> +extern void *swiotlb_alloc_boot(size_t size, unsigned long nslabs);
> +extern void *swiotlb_alloc(unsigned order, unsigned long nslabs);
> +
> #endif /* _ASM_IA64_DMA_MAPPING_H */
> diff --git a/arch/ia64/kernel/pci-swiotlb.c b/arch/ia64/kernel/pci-swiotlb.c
> index 285aae8..1b42f21 100644
> --- a/arch/ia64/kernel/pci-swiotlb.c
> +++ b/arch/ia64/kernel/pci-swiotlb.c
> @@ -4,6 +4,7 @@
> #include <linux/cache.h>
> #include <linux/module.h>
> #include <linux/dma-mapping.h>
> +#include <linux/bootmem.h>
>
> #include <asm/swiotlb.h>
> #include <asm/dma.h>
> @@ -13,6 +14,16 @@
> int swiotlb __read_mostly;
> EXPORT_SYMBOL(swiotlb);
>
> +void * __init swiotlb_alloc_boot(size_t size, unsigned long nslabs)
> +{
> + return alloc_bootmem_low_pages(size);
> +}
> +
> +void *swiotlb_alloc(unsigned order, unsigned long nslabs)
> +{
> + return (void *)__get_free_pages(GFP_DMA | __GFP_NOWARN, order);
> +}
> +
> static void *ia64_swiotlb_alloc_coherent(struct device *dev, size_t size,
> dma_addr_t *dma_handle, gfp_t gfp)
> {
> diff --git a/arch/x86/include/asm/dma-mapping.h b/arch/x86/include/asm/dma-mapping.h
> index aa9639f..5a3180d 100644
> --- a/arch/x86/include/asm/dma-mapping.h
> +++ b/arch/x86/include/asm/dma-mapping.h
> @@ -324,4 +324,8 @@ static inline int swiotlb_force_mapping(phys_addr_t paddr, size_t size)
> return 0;
> }
>
> +extern void (*x86_swiotlb_alloc_fixup)(void *buf, size_t size,
> + unsigned long nslabs);
> +extern void *swiotlb_alloc_boot(size_t size, unsigned long nslabs);
> +
> #endif
> diff --git a/arch/x86/kernel/pci-swiotlb.c b/arch/x86/kernel/pci-swiotlb.c
> index d48912c..7de9fdd 100644
> --- a/arch/x86/kernel/pci-swiotlb.c
> +++ b/arch/x86/kernel/pci-swiotlb.c
> @@ -6,6 +6,7 @@
> #include <linux/swiotlb.h>
> #include <linux/bootmem.h>
> #include <linux/dma-mapping.h>
> +#include <linux/bootmem.h>
>
> #include <asm/iommu.h>
> #include <asm/swiotlb.h>
> @@ -16,6 +17,17 @@
> int swiotlb __read_mostly;
>
> int (*x86_swiotlb_force_mapping)(phys_addr_t paddr, size_t size);
> +void __initdata (*x86_swiotlb_alloc_fixup)(void *buf, size_t size, unsigned long nslabs);
> +
> +void * __init swiotlb_alloc_boot(size_t size, unsigned long nslabs)
> +{
> + void *ret = alloc_bootmem_low_pages(size);
> +
> + if (ret && x86_swiotlb_alloc_fixup)
> + x86_swiotlb_alloc_fixup(ret, size, nslabs);
> +
> + return ret;
> +}
>
> static void *x86_swiotlb_alloc_coherent(struct device *hwdev, size_t size,
> dma_addr_t *dma_handle, gfp_t flags)
> diff --git a/arch/x86/xen/pci-swiotlb.c b/arch/x86/xen/pci-swiotlb.c
> index e23b00b..dcf2ef8 100644
> --- a/arch/x86/xen/pci-swiotlb.c
> +++ b/arch/x86/xen/pci-swiotlb.c
> @@ -11,23 +11,6 @@
> * implementations in lib/swiotlb.c.
> */
>
> -void * __init swiotlb_alloc_boot(size_t size, unsigned long nslabs)
> -{
> - void *ret = alloc_bootmem_low_pages(size);
> -
> - if (ret && xen_pv_domain())
> - xen_swiotlb_fixup(ret, size, nslabs);
> -
> - return ret;
> -}
> -
> -void *swiotlb_alloc(unsigned order, unsigned long nslabs)
> -{
> - /* Never called on x86. Warn, just in case. */
> - WARN_ON(1);
> - return NULL;
> -}
> -
> dma_addr_t swiotlb_phys_to_bus(struct device *hwdev, phys_addr_t paddr)
> {
> if (xen_pv_domain())
> diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
> index 32f4fa4..be8b77d 100644
> --- a/include/linux/swiotlb.h
> +++ b/include/linux/swiotlb.h
> @@ -24,9 +24,6 @@ struct scatterlist;
> extern void
> swiotlb_init(void);
>
> -extern void *swiotlb_alloc_boot(size_t bytes, unsigned long nslabs);
> -extern void *swiotlb_alloc(unsigned order, unsigned long nslabs);
> -
> extern dma_addr_t swiotlb_phys_to_bus(struct device *hwdev,
> phys_addr_t address);
> extern phys_addr_t swiotlb_bus_to_phys(struct device *hwdev,
> diff --git a/lib/swiotlb.c b/lib/swiotlb.c
> index d311654..640c2f1 100644
> --- a/lib/swiotlb.c
> +++ b/lib/swiotlb.c
> @@ -114,16 +114,6 @@ setup_io_tlb_npages(char *str)
> __setup("swiotlb=", setup_io_tlb_npages);
> /* make io_tlb_overflow tunable too? */
>
> -void * __weak __init swiotlb_alloc_boot(size_t size, unsigned long nslabs)
> -{
> - return alloc_bootmem_low_pages(size);
> -}
> -
> -void * __weak swiotlb_alloc(unsigned order, unsigned long nslabs)
> -{
> - return (void *)__get_free_pages(GFP_DMA | __GFP_NOWARN, order);
> -}
> -
> dma_addr_t __weak swiotlb_phys_to_bus(struct device *hwdev, phys_addr_t paddr)
> {
> return paddr;
> @@ -213,6 +203,7 @@ swiotlb_init(void)
> swiotlb_init_with_default_size(64 * (1<<20)); /* default to 64MB */
> }
>
> +#ifdef SWIOTLB_WANT_LATE_INIT
> /*
> * Systems with larger DMA zones (those that don't support ISA) can
> * initialize the swiotlb later using the slab allocator if needed.
> @@ -306,6 +297,7 @@ cleanup1:
> io_tlb_nslabs = req_nslabs;
> return -ENOMEM;
> }
> +#endif
>
> static inline int force_mapping(phys_addr_t paddr, size_t size)
> {
> --
> 1.5.6.5
>
> --
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