linux-kernel - Re: [PATCH 2/5] iommu/mediatek: Add mt8173 IOMMU driver

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Message-ID: <1425903386.13300.33.camel@mhfsdcap03>
Date:	Mon, 9 Mar 2015 20:16:26 +0800
From:	Yong Wu <yong.wu@...iatek.com>
To:	Mitchel Humpherys <mitchelh@...eaurora.org>
CC:	Rob Herring <robh+dt@...nel.org>, Joerg Roedel <joro@...tes.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Mark Rutland <mark.rutland@....com>,
	<devicetree@...r.kernel.org>, <srv_heupstream@...iatek.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	<linux-kernel@...r.kernel.org>, "Tomasz Figa" <tfiga@...gle.com>,
	<iommu@...ts.linux-foundation.org>,
	Daniel Kurtz <djkurtz@...gle.com>,
	Sasha Hauer <kernel@...gutronix.de>,
	<linux-mediatek@...ts.infradead.org>,
	Robin Murphy <robin.murphy@....com>,
	<linux-arm-kernel@...ts.infradead.org>,
	Lucas Stach <l.stach@...gutronix.de>
Subject: Re: [PATCH 2/5] iommu/mediatek: Add mt8173 IOMMU driver

Dear Mitchel,
     Thanks very much for your review.

On Fri, 2015-03-06 at 09:15 -0800, Mitchel Humpherys wrote:
> On Fri, Mar 06 2015 at 02:48:17 AM, <yong.wu@...iatek.com> wrote:
> > From: Yong Wu <yong.wu@...iatek.com>
> >
> > This patch adds support for mediatek m4u (MultiMedia Memory Management Unit).
> > Currently this only supports m4u gen 2 with 2 levels of page table on mt8173.
> 
> [...]
> 
> > +static int mtk_iommu_invalidate_tlb(const struct mtk_iommu_info *piommu,
> > +				    int isinvall, unsigned int iova_start,
> > +				    unsigned int iova_end)
> > +{
> > +	void __iomem *m4u_base = piommu->m4u_base;
> > +	u32 val;
> > +	u64 start, end;
> > +
> > +	start = sched_clock();
> > +
> > +	if (!isinvall) {
> > +		iova_start = round_down(iova_start, SZ_4K);
> > +		iova_end = round_up(iova_end, SZ_4K);
> > +	}
> > +
> > +	val = F_MMU_INV_EN_L2 | F_MMU_INV_EN_L1;
> > +
> > +	writel(val, m4u_base + REG_INVLID_SEL);
> > +
> > +	if (isinvall) {
> > +		writel(F_MMU_INV_ALL, m4u_base + REG_MMU_INVLD);
> > +	} else {
> > +		writel(iova_start, m4u_base + REG_MMU_INVLD_SA);
> > +		writel(iova_end, m4u_base + REG_MMU_INVLD_EA);
> > +		writel(F_MMU_INV_RANGE, m4u_base + REG_MMU_INVLD);
> > +
> > +		while (!readl(m4u_base + REG_MMU_CPE_DONE)) {
> > +			end = sched_clock();
> > +			if (end - start >= 100000000ULL) {
> > +				dev_warn(piommu->dev, "invalid don't done\n");
> > +				writel(F_MMU_INV_ALL, m4u_base + REG_MMU_INVLD);
> > +			}
> > +		};
> 
> Superfluous `;'.  Also, maybe you should be using readl_poll_timeout?
   Thanks.
   For the "readl_poll_timeout", My base is 3.19-rc7 and robin's patch.
it don't have this interface.  I will try to add it in the next version.
> 
> > +		writel(0, m4u_base + REG_MMU_CPE_DONE);
> > +	}
> > +
> > +	return 0;
> > +}
> 
> 
> 
> -Mitch
> 


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