linux-kernel - RE: [PATCH 8/9] dspbridge: add map support for big buffers

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Date:	Thu, 1 Jul 2010 18:36:06 -0500
From:	"Kanigeri, Hari" <h-kanigeri2@...com>
To:	"Guzman Lugo, Fernando" <fernando.lugo@...com>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:	"ohad@...ery.com" <ohad@...ery.com>,
	"hiroshi.doyu@...ia.com" <hiroshi.doyu@...ia.com>,
	"ameya.palande@...ia.com" <ameya.palande@...ia.com>,
	"felipe.contreras@...ia.com" <felipe.contreras@...ia.com>,
	"Guzman Lugo, Fernando" <fernando.lugo@...com>
Subject: RE: [PATCH 8/9] dspbridge: add map support for big buffers

Fernando,

> -	for_each_sg(sgt->sgl, sg, sgt->nents, i)
> -		sg_set_page(sg, usr_pgs[i], PAGE_SIZE, 0);
> +		da = iommu_vmap(mmu, da, sgt, IOVMF_ENDIAN_LITTLE |
> +							IOVMF_ELSZ_32);

-- iommu_vmap does the Kernel mapping to the buffers you are mapping to DSP MMU. Why do you need Kernel mappings ? 

If there is no benefit in maintaining Kernel mapping I would rather call iopgtable_store_entry directly to map the entries. 

Thank you,
Best regards, Hari
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