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Date: Wed, 22 Apr 2015 19:09:40 +0200
From: "Luis R. Rodriguez" <mcgrof@...e.com>
To: "Luis R. Rodriguez" <mcgrof@...not-panic.com>
Cc: mingo@...e.hu, tglx@...utronix.de, hpa@...or.com,
plagnioj@...osoft.com, tomi.valkeinen@...com,
linux-fbdev@...r.kernel.org, luto@...capital.net, mst@...hat.com,
cocci@...teme.lip6.fr, Toshi Kani <toshi.kani@...com>,
Ingo Molnar <mingo@...hat.com>,
Will Deacon <will.deacon@....com>,
Thierry Reding <treding@...dia.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Dave Hansen <dave.hansen@...ux.intel.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Catalin Marinas <catalin.marinas@....com>,
Abhilash Kesavan <a.kesavan@...sung.com>,
Matthias Brugger <matthias.bgg@...il.com>,
Cristian Stoica <cristian.stoica@...escale.com>,
dri-devel@...ts.freedesktop.org,
Suresh Siddha <sbsiddha@...il.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Juergen Gross <jgross@...e.com>,
Daniel Vetter <daniel.vetter@...ll.ch>,
Dave Airlie <airlied@...hat.com>,
Antonino Daplas <adaplas@...il.com>,
Ville Syrjälä <syrjala@....fi>,
Mel Gorman <mgorman@...e.de>, Vlastimil Babka <vbabka@...e.cz>,
Borislav Petkov <bp@...e.de>, Davidlohr Bueso <dbueso@...e.de>,
x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] mtrr: avoid ifdef'ery with phys_wc_to_mtrr_index()
On Tue, Apr 21, 2015 at 01:42:51PM -0700, Luis R. Rodriguez wrote:
> From: "Luis R. Rodriguez" <mcgrof@...e.com>
>
> There is only one user but since we're going to bury
> MTRR next out of access to drivers expose this last
> piece of API to drivers in a general fashion only
> needing io.h for access to helpers.
>
> Cc: Toshi Kani <toshi.kani@...com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: "H. Peter Anvin" <hpa@...or.com>
> Cc: Will Deacon <will.deacon@....com>
> Cc: Thierry Reding <treding@...dia.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Dave Hansen <dave.hansen@...ux.intel.com>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Abhilash Kesavan <a.kesavan@...sung.com>
> Cc: Matthias Brugger <matthias.bgg@...il.com>
> Cc: Cristian Stoica <cristian.stoica@...escale.com>
> Cc: dri-devel@...ts.freedesktop.org
> Cc: Suresh Siddha <sbsiddha@...il.com>
> Cc: Linus Torvalds <torvalds@...ux-foundation.org>
> Cc: Juergen Gross <jgross@...e.com>
> Cc: Daniel Vetter <daniel.vetter@...ll.ch>
> Cc: Andy Lutomirski <luto@...capital.net>
> Cc: Dave Airlie <airlied@...hat.com>
> Cc: Antonino Daplas <adaplas@...il.com>
> Cc: Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>
> Cc: Tomi Valkeinen <tomi.valkeinen@...com>
> Cc: Ville Syrjälä <syrjala@....fi>
> Cc: Mel Gorman <mgorman@...e.de>
> Cc: Vlastimil Babka <vbabka@...e.cz>
> Cc: Borislav Petkov <bp@...e.de>
> Cc: Davidlohr Bueso <dbueso@...e.de>
> Cc: x86@...nel.org
> Cc: linux-fbdev@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Luis R. Rodriguez <mcgrof@...e.com>
> ---
> arch/x86/include/asm/io.h | 3 +++
> arch/x86/include/asm/mtrr.h | 5 -----
> arch/x86/kernel/cpu/mtrr/main.c | 6 +++---
> drivers/gpu/drm/drm_ioctl.c | 14 +-------------
> include/linux/io.h | 6 ++++++
> 5 files changed, 13 insertions(+), 21 deletions(-)
>
> diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h
> index 4afc05f..a2b9740 100644
> --- a/arch/x86/include/asm/io.h
> +++ b/arch/x86/include/asm/io.h
> @@ -339,6 +339,9 @@ extern bool xen_biovec_phys_mergeable(const struct bio_vec *vec1,
> #define IO_SPACE_LIMIT 0xffff
>
> #ifdef CONFIG_MTRR
> +extern int __must_check arch_phys_wc_index(int handle);
> +#define arch_phys_wc_index arch_phys_wc_index
> +
> extern int __must_check arch_phys_wc_add(unsigned long base,
> unsigned long size);
> extern void arch_phys_wc_del(int handle);
> diff --git a/arch/x86/include/asm/mtrr.h b/arch/x86/include/asm/mtrr.h
> index da8dff1..27e3dc0 100644
> --- a/arch/x86/include/asm/mtrr.h
> +++ b/arch/x86/include/asm/mtrr.h
> @@ -48,7 +48,6 @@ extern void mtrr_aps_init(void);
> extern void mtrr_bp_restore(void);
> extern int mtrr_trim_uncached_memory(unsigned long end_pfn);
> extern int amd_special_default_mtrr(void);
> -extern int phys_wc_to_mtrr_index(int handle);
> # else
> static inline u8 mtrr_type_lookup(u64 addr, u64 end, u8 *uniform)
> {
> @@ -85,10 +84,6 @@ static inline int mtrr_trim_uncached_memory(unsigned long end_pfn)
> static inline void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi)
> {
> }
> -static inline int phys_wc_to_mtrr_index(int handle)
> -{
> - return -1;
> -}
>
> #define mtrr_ap_init() do {} while (0)
> #define mtrr_bp_init() do {} while (0)
> diff --git a/arch/x86/kernel/cpu/mtrr/main.c b/arch/x86/kernel/cpu/mtrr/main.c
> index 12abdbe..d8c106c 100644
> --- a/arch/x86/kernel/cpu/mtrr/main.c
> +++ b/arch/x86/kernel/cpu/mtrr/main.c
> @@ -580,7 +580,7 @@ void arch_phys_wc_del(int handle)
> EXPORT_SYMBOL(arch_phys_wc_del);
>
> /*
> - * phys_wc_to_mtrr_index - translates arch_phys_wc_add's return value
> + * arch_phys_wc_index - translates arch_phys_wc_add's return value
> * @handle: Return value from arch_phys_wc_add
> *
> * This will turn the return value from arch_phys_wc_add into an mtrr
> @@ -590,14 +590,14 @@ EXPORT_SYMBOL(arch_phys_wc_del);
> * in printk line. Alas there is an illegitimate use in some ancient
> * drm ioctls.
> */
> -int phys_wc_to_mtrr_index(int handle)
> +int arch_phys_wc_index(int handle)
> {
> if (handle < MTRR_TO_PHYS_WC_OFFSET)
> return -1;
> else
> return handle - MTRR_TO_PHYS_WC_OFFSET;
> }
> -EXPORT_SYMBOL_GPL(phys_wc_to_mtrr_index);
> +EXPORT_SYMBOL_GPL(arch_phys_wc_index);
>
> /*
> * HACK ALERT!
> diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
> index 266dcd6..0a95782 100644
> --- a/drivers/gpu/drm/drm_ioctl.c
> +++ b/drivers/gpu/drm/drm_ioctl.c
> @@ -36,9 +36,6 @@
>
> #include <linux/pci.h>
> #include <linux/export.h>
> -#ifdef CONFIG_X86
> -#include <asm/mtrr.h>
> -#endif
>
> static int drm_version(struct drm_device *dev, void *data,
> struct drm_file *file_priv);
> @@ -197,16 +194,7 @@ static int drm_getmap(struct drm_device *dev, void *data,
> map->type = r_list->map->type;
> map->flags = r_list->map->flags;
> map->handle = (void *)(unsigned long) r_list->user_token;
> -
> -#ifdef CONFIG_X86
> - /*
> - * There appears to be exactly one user of the mtrr index: dritest.
> - * It's easy enough to keep it working on non-PAT systems.
> - */
> - map->mtrr = phys_wc_to_mtrr_index(r_list->map->mtrr);
> -#else
> - map->mtrr = -1;
> -#endif
> + map->mtrr = arch_phys_wc_index(r_list->map->mtrr);
>
> mutex_unlock(&dev->struct_mutex);
>
> diff --git a/include/linux/io.h b/include/linux/io.h
> index 986f2bf..6e29acf 100644
> --- a/include/linux/io.h
> +++ b/include/linux/io.h
> @@ -111,6 +111,12 @@ static inline void arch_phys_wc_del(int handle)
> }
>
> #define arch_phys_wc_add arch_phys_wc_add
> +#ifndef arch_phys_wc_index
> +static inline int arch_phys_wc_index(int handle)
> +{
> + return -1;
> +}
> +#define arch_phys_wc_index arch_phys_wc_index
> #endif
Sorry this is missing an #endif here, will send a v4.
Luis
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