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Wed, 20 May 2020 05:44:23 -0700 (PDT) Date: Wed, 20 May 2020 14:44:13 +0200 From: Jean-Philippe Brucker To: Will Deacon Subject: Re: [PATCH] perf/smmuv3: Allow sharing MMIO registers with the SMMU driver Message-ID: <20200520124413.GA2512145@myrica> References: <20200421155745.19815-1-jean-philippe@linaro.org> <20200520122453.GB25815@willie-the-truck> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200520122453.GB25815@willie-the-truck> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200520_054431_510781_80EC8F3C X-CRM114-Status: GOOD ( 16.69 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, iommu@lists.linux-foundation.org, lorenzo.pieralisi@arm.com, robin.murphy@arm.com, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, May 20, 2020 at 01:24:53PM +0100, Will Deacon wrote: > On Tue, Apr 21, 2020 at 05:57:46PM +0200, Jean-Philippe Brucker wrote: > > Some Arm SMMUv3 implementations, for example Arm CoreLink MMU-600, embed > > the PMCG registers into the SMMU MMIO regions. It currently causes probe > > failure because the PMU and SMMU drivers request overlapping resources. > > > > Avoid the conflict by calling devm_ioremap() directly from the PMU > > driver. We loose some sanity-checking of the memory map provided by > > firmware, which doesn't seem catastrophic. > > > > Signed-off-by: Jean-Philippe Brucker > > --- > > > > So this is the simplest solution, and I don't think we're missing much > > by skipping the resource reservation. I've also been exploring a more > > complex approach [1] which has the SMMU driver perform resource > > reservation on behalf of the PMU driver, but I'm not sure it's > > necessary. > > > > Please test, I've only tried the RevC FastModel using devicetree so far. > > > > [1] https://jpbrucker.net/git/linux/log/?h=smmu/pmu > > --- > > drivers/perf/arm_smmuv3_pmu.c | 28 +++++++++++++++++++++------- > > 1 file changed, 21 insertions(+), 7 deletions(-) > > Is this patch still needed? I can't quite follow from the discussion. No, it is superseded by "[PATCH v2] iommu/arm-smmu-v3: Don't reserve implementation defined register space" that you applied yesterday (Thanks!) Jean _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel