linux-kernel - Re: [PATCH] drm/nouveau/core: deinline nv

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Date:	Fri, 08 May 2015 08:14:15 -0400
From:	Peter Hurley <peter@...leysoftware.com>
To:	Denys Vlasenko <dvlasenk@...hat.com>,
	Ben Skeggs <bskeggs@...hat.com>
CC:	Stefan Huehner <stefan@...hner.org>,
	David Airlie <airlied@...ux.ie>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/nouveau/core: deinline nv_mask()

On 05/07/2015 04:49 AM, Denys Vlasenko wrote:
> Function compiles to 89 bytes of machine code.
> 466 callsites with this .config:
> http://busybox.net/~vda/kernel_config
> Size reduction:

Much of the cruft is related to calling iowriteX.

Ben,

Isn't subdev io always mmio? (iow, never to the 64k i/o space)


>    text      data      bss       dec     hex filename
> 82432426 22255384 20627456 125315266 77828c2 vmlinux.before
> 82426986 22255416 20627456 125309858 77813a2 vmlinux
> 
> Signed-off-by: Denys Vlasenko <dvlasenk@...hat.com>
> CC: Stefan Huehner <stefan@...hner.org>
> CC: Ben Skeggs <bskeggs@...hat.com>
> CC: David Airlie <airlied@...ux.ie>
> CC: dri-devel@...ts.freedesktop.org
> CC: linux-kernel@...r.kernel.org
> ---
>  drivers/gpu/drm/nouveau/include/nvkm/core/subdev.h | 9 ++-------
>  drivers/gpu/drm/nouveau/nvkm/core/subdev.c         | 8 ++++++++
>  2 files changed, 10 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/gpu/drm/nouveau/include/nvkm/core/subdev.h b/drivers/gpu/drm/nouveau/include/nvkm/core/subdev.h
> index 6fdc391..261b7ff 100644
> --- a/drivers/gpu/drm/nouveau/include/nvkm/core/subdev.h
> +++ b/drivers/gpu/drm/nouveau/include/nvkm/core/subdev.h
> @@ -109,11 +109,6 @@ nv_wr32(void *obj, u32 addr, u32 data)
>  	iowrite32_native(data, subdev->mmio + addr);
>  }
>  
> -static inline u32
> -nv_mask(void *obj, u32 addr, u32 mask, u32 data)
> -{
> -	u32 temp = nv_rd32(obj, addr);
> -	nv_wr32(obj, addr, (temp & ~mask) | data);
> -	return temp;
> -}
> +u32
> +nv_mask(void *obj, u32 addr, u32 mask, u32 data);
>  #endif
> diff --git a/drivers/gpu/drm/nouveau/nvkm/core/subdev.c b/drivers/gpu/drm/nouveau/nvkm/core/subdev.c
> index c5fb3a79..88331ea 100644
> --- a/drivers/gpu/drm/nouveau/nvkm/core/subdev.c
> +++ b/drivers/gpu/drm/nouveau/nvkm/core/subdev.c
> @@ -25,6 +25,14 @@
>  #include <core/device.h>
>  #include <core/option.h>
>  
> +u32
> +nv_mask(void *obj, u32 addr, u32 mask, u32 data)
> +{
> +	u32 temp = nv_rd32(obj, addr);
> +	nv_wr32(obj, addr, (temp & ~mask) | data);
> +	return temp;
> +}
> +
>  struct nvkm_subdev *
>  nvkm_subdev(void *obj, int idx)
>  {
> 

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