From: Vivek Gautam <vivek.gautam@codeaurora.org>
To: joro@8bytes.org, robh+dt@kernel.org, robin.murphy@arm.com,
iommu@lists.linux-foundation.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org
Cc: mark.rutland@arm.com, will.deacon@arm.com, robdclark@gmail.com,
tfiga@chromium.org, sricharan@codeaurora.org,
m.szyprowski@samsung.com, architt@codeaurora.org,
linux-arm-msm@vger.kernel.org, vivek.gautam@codeaurora.org
Subject: [PATCH v9 4/5] iommu/arm-smmu: Add the device_link between masters and smmu
Date: Tue, 13 Mar 2018 14:25:33 +0530 [thread overview]
Message-ID: <20180313085534.11650-5-vivek.gautam@codeaurora.org> (raw)
In-Reply-To: <20180313085534.11650-1-vivek.gautam@codeaurora.org>
From: Sricharan R <sricharan@codeaurora.org>
Finally add the device link between the master device and
smmu, so that the smmu gets runtime enabled/disabled only when the
master needs it. This is done from add_device callback which gets
called once when the master is added to the smmu.
Signed-off-by: Sricharan R <sricharan@codeaurora.org>
Signed-off-by: Vivek Gautam <vivek.gautam@codeaurora.org>
Reviewed-by: Tomasz Figa <tfiga@chromium.org>
---
drivers/iommu/arm-smmu.c | 29 +++++++++++++++++++++++++++++
1 file changed, 29 insertions(+)
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 56a04ae80bf3..64953ff2281f 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -1460,10 +1460,31 @@ static int arm_smmu_add_device(struct device *dev)
iommu_device_link(&smmu->iommu, dev);
+ if (pm_runtime_enabled(smmu->dev)) {
+ struct device_link *link;
+
+ /*
+ * Establish the link between smmu and master, so that the
+ * smmu gets runtime enabled/disabled as per the master's
+ * needs.
+ */
+ link = device_link_add(dev, smmu->dev, DL_FLAG_PM_RUNTIME);
+ if (!link) {
+ dev_warn(smmu->dev,
+ "Unable to add link to the consumer %s\n",
+ dev_name(dev));
+ ret = -ENODEV;
+ goto out_unlink;
+ }
+ }
+
arm_smmu_rpm_put(smmu);
return 0;
+out_unlink:
+ iommu_device_unlink(&smmu->iommu, dev);
+ arm_smmu_master_free_smes(fwspec);
out_rpm_put:
arm_smmu_rpm_put(smmu);
out_cfg_free:
@@ -1486,6 +1507,14 @@ static void arm_smmu_remove_device(struct device *dev)
cfg = fwspec->iommu_priv;
smmu = cfg->smmu;
+ if (pm_runtime_enabled(smmu->dev)) {
+ struct device_link *link;
+
+ link = device_link_find(dev, smmu->dev);
+ if (link)
+ device_link_del(link);
+ }
+
ret = arm_smmu_rpm_get(smmu);
if (ret < 0)
return;
--
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation
next prev parent reply other threads:[~2018-03-13 8:56 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-13 8:55 [PATCH v9 0/5] iommu/arm-smmu: Add runtime pm/sleep support Vivek Gautam
2018-03-13 8:55 ` [PATCH v9 1/5] driver core: Find an existing link between two devices Vivek Gautam
2018-03-13 9:40 ` Rafael J. Wysocki
2018-03-13 9:55 ` Vivek Gautam
2018-03-13 12:49 ` Robin Murphy
2018-03-13 14:39 ` Vivek Gautam
2018-03-13 9:58 ` Vivek Gautam
2018-03-13 10:15 ` Tomasz Figa
2018-03-13 10:34 ` Vivek Gautam
2018-03-13 11:23 ` Tomasz Figa
2018-03-14 11:12 ` Rafael J. Wysocki
2018-03-14 11:50 ` Tomasz Figa
2018-03-14 11:57 ` Rafael J. Wysocki
2018-03-14 12:14 ` Robin Murphy
2018-03-14 12:27 ` Lukas Wunner
2018-03-20 7:56 ` Vivek Gautam
2018-03-14 12:23 ` Lukas Wunner
2018-03-13 8:55 ` [PATCH v9 2/5] iommu/arm-smmu: Add pm_runtime/sleep ops Vivek Gautam
2018-03-13 8:55 ` [PATCH v9 3/5] iommu/arm-smmu: Invoke pm_runtime during probe, add/remove device Vivek Gautam
2018-03-14 17:46 ` Robin Murphy
2018-03-15 7:17 ` Tomasz Figa
2018-03-20 9:49 ` Vivek Gautam
2018-03-13 8:55 ` Vivek Gautam [this message]
2018-03-14 17:50 ` [PATCH v9 4/5] iommu/arm-smmu: Add the device_link between masters and smmu Robin Murphy
2018-03-15 6:18 ` Tomasz Figa
2018-03-15 10:44 ` Robin Murphy
2018-03-15 8:57 ` Vivek Gautam
2018-03-15 11:12 ` Robin Murphy
2018-03-13 8:55 ` [PATCH v9 5/5] iommu/arm-smmu: Add support for qcom,smmu-v2 variant Vivek Gautam
[not found] ` <61d30fff-1bf8-d2c1-bbe9-f93de836ae77@huawei.com>
[not found] ` <7d5af071-ef98-8461-3ce9-e84fc0b3956a@codeaurora.org>
2018-03-28 6:11 ` Yisheng Xie
2018-04-10 13:14 ` Tomasz Figa
2018-04-11 1:22 ` Yisheng Xie
2018-04-11 5:15 ` Vivek Gautam
2018-04-12 1:55 ` Yisheng Xie
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