[Intel-gfx] [PATCH] drm/i915: Export the eLLC size from KMD via IOCTL

[Daniel Vetter]

On Thu, Oct 10, 2013 at 03:11:40AM +0000, Guo, Yejun wrote:
> Hi Daniel,
> 
> For example, the close source UMD driver also requires this information.

For upstream a userspace blob as consumer isn't good enough, Dave Airlie
has clearly established this precendence in a bunch of loud emails.

So I need something which is open-source as a consumer of this.
-Daniel

> 
> Thanks for the reminder, please see the new patch below generated with git format-patch.
> 
> From 6033637a040eeb8ae0f31bdbca8d9c988582f99d Mon Sep 17 00:00:00 2001
> From: GuoYejun <yejun.guo at intel.com>
> Date: Fri, 27 Sep 2013 16:26:18 +0800
> Subject: [PATCH] drm/i915: Export the eLLC size from KMD via IOCTL
> 
> The usermode driver needs the eLLC information in order to
> make decisions which can result in significant performance improvements.
> Since all userspace drivers require this same information,
> it makes sense to store it in one globally accessible place, the kernel.
> ---
>  drivers/gpu/drm/i915/i915_dma.c |    3 +++
>  include/uapi/drm/i915_drm.h     |    1 +
>  2 files changed, 4 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
> index dd76d93..4ce36f4 100644
> --- a/drivers/gpu/drm/i915/i915_dma.c
> +++ b/drivers/gpu/drm/i915/i915_dma.c
> @@ -1003,6 +1003,9 @@ static int i915_getparam(struct drm_device *dev, void *data,
>  	case I915_PARAM_HAS_EXEC_HANDLE_LUT:
>  		value = 1;
>  		break;
> +	case I915_PARAM_ELLC_SIZE:
> +		value = dev_priv->ellc_size;
> +		break;
>  	default:
>  		DRM_DEBUG("Unknown parameter %d\n", param->param);
>  		return -EINVAL;
> diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
> index 3a4e97b..a0d4e00 100644
> --- a/include/uapi/drm/i915_drm.h
> +++ b/include/uapi/drm/i915_drm.h
> @@ -335,6 +335,7 @@ typedef struct drm_i915_irq_wait {
>  #define I915_PARAM_HAS_EXEC_NO_RELOC	 25
>  #define I915_PARAM_HAS_EXEC_HANDLE_LUT   26
>  #define I915_PARAM_HAS_WT     	 	 27
> +#define I915_PARAM_ELLC_SIZE		 28
>  
>  typedef struct drm_i915_getparam {
>  	int param;
> -- 
> 1.7.9.5
> 
> 
> Thanks
> Yejun
> 
> -----Original Message-----
> From: Daniel Vetter [mailto:daniel.vetter at ffwll.ch] On Behalf Of Daniel Vetter
> Sent: Wednesday, October 09, 2013 15:22
> To: Guo, Yejun
> Cc: intel-gfx at lists.freedesktop.org
> Subject: Re: [Intel-gfx] [PATCH] drm/i915: Export the eLLC size from KMD via IOCTL
> 
> On Wed, Oct 09, 2013 at 12:06:06AM +0000, Guo, Yejun wrote:
> > commit 6033637a040eeb8ae0f31bdbca8d9c988582f99d
> > Author: GuoYejun <yejun.guo at intel.com<mailto:yejun.guo at intel.com>>
> > Date:   Fri Sep 27 16:26:18 2013 +0800
> > 
> >     drm/i915: Export the eLLC size from KMD via IOCTL
> > 
> >     The usermode driver needs the eLLC information in order to
> >     make decisions which can result in significant performance improvements.
> >     Since all userspace drivers require this same information,
> >     it makes sense to store it in one globally accessible place, the kernel.
> 
> Do we have some examples of such userspace lying around?
> 
> Also, your patch is missing the sob line and doesn't look like it's formatted with git format-patch.
> 
> Cheers, Daniel
> > 
> > diff --git a/drivers/gpu/drm/i915/i915_dma.c 
> > b/drivers/gpu/drm/i915/i915_dma.c index dd76d93..4ce36f4 100644
> > --- a/drivers/gpu/drm/i915/i915_dma.c
> > +++ b/drivers/gpu/drm/i915/i915_dma.c
> > @@ -1003,6 +1003,9 @@ static int i915_getparam(struct drm_device *dev, void *data,
> >                 case I915_PARAM_HAS_EXEC_HANDLE_LUT:
> >                                 value = 1;
> >                                 break;
> > +             case I915_PARAM_ELLC_SIZE:
> > +                             value = dev_priv->ellc_size;
> > +                             break;
> >                 default:
> >                                 DRM_DEBUG("Unknown parameter %d\n", param->param);
> >                                 return -EINVAL; diff --git 
> > a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h index 
> > 3a4e97b..a0d4e00 100644
> > --- a/include/uapi/drm/i915_drm.h
> > +++ b/include/uapi/drm/i915_drm.h
> > @@ -335,6 +335,7 @@ typedef struct drm_i915_irq_wait {
> > #define I915_PARAM_HAS_EXEC_NO_RELOC    25
> > #define I915_PARAM_HAS_EXEC_HANDLE_LUT   26
> > #define I915_PARAM_HAS_WT                                 27
> > +#define I915_PARAM_ELLC_SIZE                           28
> > 
> > typedef struct drm_i915_getparam {
> >                 int param;
> > 
> > 
> > Yejun
> > graphics software engineer
> > Tel: (+86) 021-6116-6181
> > 
> 
> > _______________________________________________
> > Intel-gfx mailing list
> > Intel-gfx at lists.freedesktop.org
> > http://lists.freedesktop.org/mailman/listinfo/intel-gfx
> 
> 
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> +41 (0) 79 365 57 48 - http://blog.ffwll.ch

-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch