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Mon, 07 Oct 2019 13:51:23 -0700 (PDT) From: Rob Clark To: iommu@lists.linux-foundation.org Subject: [PATCH v2] iommu/arm-smmu: fix "hang" when games exit Date: Mon, 7 Oct 2019 13:49:06 -0700 Message-Id: <20191007204906.19571-1-robdclark@gmail.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <418d8426-f299-1269-2b2e-f86677cf22c2@arm.com> References: <418d8426-f299-1269-2b2e-f86677cf22c2@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191007_135125_502870_2E82C636 X-CRM114-Status: GOOD ( 14.40 ) 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: Rob Clark , Will Deacon , freedreno@lists.freedesktop.org, Joerg Roedel , open list , Robin Murphy , "moderated list:ARM SMMU DRIVERS" 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 From: Rob Clark When games, browser, or anything using a lot of GPU buffers exits, there can be many hundreds or thousands of buffers to unmap and free. If the GPU is otherwise suspended, this can cause arm-smmu to resume/suspend for each buffer, resulting 5-10 seconds worth of reprogramming the context bank (arm_smmu_write_context_bank()/arm_smmu_write_s2cr()/etc). To the user it would appear that the system just locked up. A simple solution is to use pm_runtime_put_autosuspend() instead, so we don't immediately suspend the SMMU device. Signed-off-by: Rob Clark --- v1: original v2: unconditionally use autosuspend, rather than deciding based on what consumer does drivers/iommu/arm-smmu.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c index 3f1d55fb43c4..b7b41f5001bc 100644 --- a/drivers/iommu/arm-smmu.c +++ b/drivers/iommu/arm-smmu.c @@ -289,7 +289,7 @@ static inline int arm_smmu_rpm_get(struct arm_smmu_device *smmu) static inline void arm_smmu_rpm_put(struct arm_smmu_device *smmu) { if (pm_runtime_enabled(smmu->dev)) - pm_runtime_put(smmu->dev); + pm_runtime_put_autosuspend(smmu->dev); } static struct arm_smmu_domain *to_smmu_domain(struct iommu_domain *dom) @@ -1445,6 +1445,9 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev) /* Looks ok, so add the device to the domain */ ret = arm_smmu_domain_add_master(smmu_domain, fwspec); + pm_runtime_set_autosuspend_delay(smmu->dev, 20); + pm_runtime_use_autosuspend(smmu->dev); + rpm_put: arm_smmu_rpm_put(smmu); return ret; -- 2.21.0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel