Re: [Xen-devel] [PATCH] xen: introduce xen_remap, use it instead of ioremap

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Tue, Feb 19, 2013 at 01:59:19PM +0000, Stefano Stabellini wrote:
> ioremap can't be used to map ring pages on ARM because it uses device
> memory caching attributes (MT_DEVICE*).
> 
> Introduce a Xen specific abstraction to map ring pages, called
> xen_remap, that is defined as ioremap on x86 (no behavioral changes).
> On ARM it explicitly calls __arm_ioremap with the right caching
> attributes: MT_MEMORY.

Do you want to push this to Linus yourself or should I just include it
in my 'for-39' tree?

Do you have other patches for 3.9?
> 
> Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
> 
> diff --git a/arch/arm/include/asm/xen/page.h b/arch/arm/include/asm/xen/page.h
> index c6b9096..30cdacb 100644
> --- a/arch/arm/include/asm/xen/page.h
> +++ b/arch/arm/include/asm/xen/page.h
> @@ -1,6 +1,7 @@
>  #ifndef _ASM_ARM_XEN_PAGE_H
>  #define _ASM_ARM_XEN_PAGE_H
>  
> +#include <asm/mach/map.h>
>  #include <asm/page.h>
>  #include <asm/pgtable.h>
>  
> @@ -86,4 +87,7 @@ static inline bool set_phys_to_machine(unsigned long pfn, 
> unsigned long mfn)
>  {
>       return __set_phys_to_machine(pfn, mfn);
>  }
> +
> +#define xen_remap(cookie, size) __arm_ioremap((cookie), (size), MT_MEMORY);
> +
>  #endif /* _ASM_ARM_XEN_PAGE_H */
> diff --git a/arch/x86/include/asm/xen/page.h b/arch/x86/include/asm/xen/page.h
> index 472b9b7..6aef9fb 100644
> --- a/arch/x86/include/asm/xen/page.h
> +++ b/arch/x86/include/asm/xen/page.h
> @@ -212,4 +212,6 @@ unsigned long arbitrary_virt_to_mfn(void *vaddr);
>  void make_lowmem_page_readonly(void *vaddr);
>  void make_lowmem_page_readwrite(void *vaddr);
>  
> +#define xen_remap(cookie, size) ioremap((cookie), (size));
> +
>  #endif /* _ASM_X86_XEN_PAGE_H */
> diff --git a/drivers/tty/hvc/hvc_xen.c b/drivers/tty/hvc/hvc_xen.c
> index 19843ec..682210d7 100644
> --- a/drivers/tty/hvc/hvc_xen.c
> +++ b/drivers/tty/hvc/hvc_xen.c
> @@ -230,7 +230,7 @@ static int xen_hvm_console_init(void)
>       if (r < 0 || v == 0)
>               goto err;
>       mfn = v;
> -     info->intf = ioremap(mfn << PAGE_SHIFT, PAGE_SIZE);
> +     info->intf = xen_remap(mfn << PAGE_SHIFT, PAGE_SIZE);
>       if (info->intf == NULL)
>               goto err;
>       info->vtermno = HVC_COOKIE;
> diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c
> index 7038de5..1c2a1e5 100644
> --- a/drivers/xen/grant-table.c
> +++ b/drivers/xen/grant-table.c
> @@ -1146,7 +1146,7 @@ int gnttab_resume(void)
>               return gnttab_map(0, nr_grant_frames - 1);
>  
>       if (gnttab_shared.addr == NULL) {
> -             gnttab_shared.addr = ioremap(xen_hvm_resume_frames,
> +             gnttab_shared.addr = xen_remap(xen_hvm_resume_frames,
>                                               PAGE_SIZE * max_nr_gframes);
>               if (gnttab_shared.addr == NULL) {
>                       printk(KERN_WARNING
> diff --git a/drivers/xen/xenbus/xenbus_probe.c 
> b/drivers/xen/xenbus/xenbus_probe.c
> index 038b71d..3325884 100644
> --- a/drivers/xen/xenbus/xenbus_probe.c
> +++ b/drivers/xen/xenbus/xenbus_probe.c
> @@ -769,7 +769,7 @@ static int __init xenbus_init(void)
>                       goto out_error;
>               xen_store_mfn = (unsigned long)v;
>               xen_store_interface =
> -                     ioremap(xen_store_mfn << PAGE_SHIFT, PAGE_SIZE);
> +                     xen_remap(xen_store_mfn << PAGE_SHIFT, PAGE_SIZE);
>               break;
>       default:
>               pr_warn("Xenstore state unknown\n");

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