linux-kernel - Re: [PATCH 05/22] drm/i915: Make use of the new sg_map helper function

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Message-ID: <20170418064427.r5ewu3p66p2zwdru@phenom.ffwll.local>
Date:   Tue, 18 Apr 2017 08:44:27 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     Logan Gunthorpe <logang@...tatee.com>
Cc:     Christoph Hellwig <hch@....de>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Sagi Grimberg <sagi@...mberg.me>, Jens Axboe <axboe@...nel.dk>,
        Tejun Heo <tj@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        Matthew Wilcox <mawilcox@...rosoft.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Ming Lin <ming.l@....samsung.com>,
        linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
        linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linaro-mm-sig@...ts.linaro.org, intel-gfx@...ts.freedesktop.org,
        linux-raid@...r.kernel.org, linux-mmc@...r.kernel.org,
        linux-nvme@...ts.infradead.org, linux-nvdimm@...ts.01.org,
        linux-scsi@...r.kernel.org, fcoe-devel@...n-fcoe.org,
        open-iscsi@...glegroups.com, megaraidlinux.pdl@...adcom.com,
        sparmaintainer@...sys.com, devel@...verdev.osuosl.org,
        target-devel@...r.kernel.org, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org, rds-devel@....oracle.com,
        Steve Wise <swise@...ngridcomputing.com>,
        Stephen Bates <sbates@...thlin.com>
Subject: Re: [PATCH 05/22] drm/i915: Make use of the new sg_map helper
 function

On Thu, Apr 13, 2017 at 04:05:18PM -0600, Logan Gunthorpe wrote:
> This is a single straightforward conversion from kmap to sg_map.
> 
> Signed-off-by: Logan Gunthorpe <logang@...tatee.com>

Acked-by: Daniel Vetter <daniel.vetter@...ll.ch>

Probably makes sense to merge through some other tree, but please be aware
of the considerable churn rate in i915 (i.e. make sure your tree is in
linux-next before you send a pull request for this). Plane B would be to
get the prep patch in first and then merge the i915 conversion one kernel
release later.
-Daniel

> ---
>  drivers/gpu/drm/i915/i915_gem.c | 27 ++++++++++++++++-----------
>  1 file changed, 16 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
> index 67b1fc5..1b1b91a 100644
> --- a/drivers/gpu/drm/i915/i915_gem.c
> +++ b/drivers/gpu/drm/i915/i915_gem.c
> @@ -2188,6 +2188,15 @@ static void __i915_gem_object_reset_page_iter(struct drm_i915_gem_object *obj)
>  		radix_tree_delete(&obj->mm.get_page.radix, iter.index);
>  }
>  
> +static void i915_gem_object_unmap(const struct drm_i915_gem_object *obj,
> +				  void *ptr)
> +{
> +	if (is_vmalloc_addr(ptr))
> +		vunmap(ptr);
> +	else
> +		sg_unmap(obj->mm.pages->sgl, ptr, SG_KMAP);
> +}
> +
>  void __i915_gem_object_put_pages(struct drm_i915_gem_object *obj,
>  				 enum i915_mm_subclass subclass)
>  {
> @@ -2215,10 +2224,7 @@ void __i915_gem_object_put_pages(struct drm_i915_gem_object *obj,
>  		void *ptr;
>  
>  		ptr = ptr_mask_bits(obj->mm.mapping);
> -		if (is_vmalloc_addr(ptr))
> -			vunmap(ptr);
> -		else
> -			kunmap(kmap_to_page(ptr));
> +		i915_gem_object_unmap(obj, ptr);
>  
>  		obj->mm.mapping = NULL;
>  	}
> @@ -2475,8 +2481,11 @@ static void *i915_gem_object_map(const struct drm_i915_gem_object *obj,
>  	void *addr;
>  
>  	/* A single page can always be kmapped */
> -	if (n_pages == 1 && type == I915_MAP_WB)
> -		return kmap(sg_page(sgt->sgl));
> +	if (n_pages == 1 && type == I915_MAP_WB) {
> +		addr = sg_map(sgt->sgl, SG_KMAP);
> +		if (IS_ERR(addr))
> +			return NULL;
> +	}
>  
>  	if (n_pages > ARRAY_SIZE(stack_pages)) {
>  		/* Too big for stack -- allocate temporary array instead */
> @@ -2543,11 +2552,7 @@ void *i915_gem_object_pin_map(struct drm_i915_gem_object *obj,
>  			goto err_unpin;
>  		}
>  
> -		if (is_vmalloc_addr(ptr))
> -			vunmap(ptr);
> -		else
> -			kunmap(kmap_to_page(ptr));
> -
> +		i915_gem_object_unmap(obj, ptr);
>  		ptr = obj->mm.mapping = NULL;
>  	}
>  
> -- 
> 2.1.4
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

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