From: Vivek Gautam <vivek.gautam@codeaurora.org>
To: joro@8bytes.org, robh+dt@kernel.org, robin.murphy@arm.com,
will.deacon@arm.com, iommu@lists.linux-foundation.org,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: alex.williamson@redhat.com, mark.rutland@arm.com,
rjw@rjwysocki.net, robdclark@gmail.com, linux-pm@vger.kernel.org,
freedreno@lists.freedesktop.org, sboyd@kernel.org,
tfiga@chromium.org, jcrouse@codeaurora.org,
sricharan@codeaurora.org, m.szyprowski@samsung.com,
architt@codeaurora.org, linux-arm-msm@vger.kernel.org,
Vivek Gautam <vivek.gautam@codeaurora.org>
Subject: [RESEND PATCH v17 1/5] iommu/arm-smmu: Add pm_runtime/sleep ops
Date: Fri, 16 Nov 2018 16:54:26 +0530 [thread overview]
Message-ID: <20181116112430.31248-2-vivek.gautam@codeaurora.org> (raw)
In-Reply-To: <20181116112430.31248-1-vivek.gautam@codeaurora.org>
From: Sricharan R <sricharan@codeaurora.org>
The smmu needs to be functional only when the respective
master's using it are active. The device_link feature
helps to track such functional dependencies, so that the
iommu gets powered when the master device enables itself
using pm_runtime. So by adapting the smmu driver for
runtime pm, above said dependency can be addressed.
This patch adds the pm runtime/sleep callbacks to the
driver and also the functions to parse the smmu clocks
from DT and enable them in resume/suspend.
Also, while we enable the runtime pm add a pm sleep suspend
callback that pushes devices to low power state by turning
the clocks off in a system sleep.
Also add corresponding clock enable path in resume callback.
Signed-off-by: Sricharan R <sricharan@codeaurora.org>
Signed-off-by: Archit Taneja <architt@codeaurora.org>
[vivek: rework for clock and pm ops]
Signed-off-by: Vivek Gautam <vivek.gautam@codeaurora.org>
Reviewed-by: Tomasz Figa <tfiga@chromium.org>
Tested-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
---
drivers/iommu/arm-smmu.c | 77 ++++++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 74 insertions(+), 3 deletions(-)
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 5a28ae892504..f7ab7ce87a94 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -48,6 +48,7 @@
#include <linux/of_iommu.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
@@ -206,6 +207,8 @@ struct arm_smmu_device {
u32 num_global_irqs;
u32 num_context_irqs;
unsigned int *irqs;
+ struct clk_bulk_data *clks;
+ int num_clks;
u32 cavium_id_base; /* Specific to Cavium */
@@ -1944,10 +1947,12 @@ static int arm_smmu_device_cfg_probe(struct arm_smmu_device *smmu)
struct arm_smmu_match_data {
enum arm_smmu_arch_version version;
enum arm_smmu_implementation model;
+ const char * const *clks;
+ int num_clks;
};
#define ARM_SMMU_MATCH_DATA(name, ver, imp) \
-static struct arm_smmu_match_data name = { .version = ver, .model = imp }
+static const struct arm_smmu_match_data name = { .version = ver, .model = imp }
ARM_SMMU_MATCH_DATA(smmu_generic_v1, ARM_SMMU_V1, GENERIC_SMMU);
ARM_SMMU_MATCH_DATA(smmu_generic_v2, ARM_SMMU_V2, GENERIC_SMMU);
@@ -1966,6 +1971,23 @@ static const struct of_device_id arm_smmu_of_match[] = {
};
MODULE_DEVICE_TABLE(of, arm_smmu_of_match);
+static void arm_smmu_fill_clk_data(struct arm_smmu_device *smmu,
+ const char * const *clks)
+{
+ int i;
+
+ if (smmu->num_clks < 1)
+ return;
+
+ smmu->clks = devm_kcalloc(smmu->dev, smmu->num_clks,
+ sizeof(*smmu->clks), GFP_KERNEL);
+ if (!smmu->clks)
+ return;
+
+ for (i = 0; i < smmu->num_clks; i++)
+ smmu->clks[i].id = clks[i];
+}
+
#ifdef CONFIG_ACPI
static int acpi_smmu_get_data(u32 model, struct arm_smmu_device *smmu)
{
@@ -2048,6 +2070,9 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev,
data = of_device_get_match_data(dev);
smmu->version = data->version;
smmu->model = data->model;
+ smmu->num_clks = data->num_clks;
+
+ arm_smmu_fill_clk_data(smmu, data->clks);
parse_driver_options(smmu);
@@ -2150,6 +2175,14 @@ static int arm_smmu_device_probe(struct platform_device *pdev)
smmu->irqs[i] = irq;
}
+ err = devm_clk_bulk_get(smmu->dev, smmu->num_clks, smmu->clks);
+ if (err)
+ return err;
+
+ err = clk_bulk_prepare_enable(smmu->num_clks, smmu->clks);
+ if (err)
+ return err;
+
err = arm_smmu_device_cfg_probe(smmu);
if (err)
return err;
@@ -2236,6 +2269,9 @@ static int arm_smmu_device_remove(struct platform_device *pdev)
/* Turn the thing off */
writel(sCR0_CLIENTPD, ARM_SMMU_GR0_NS(smmu) + ARM_SMMU_GR0_sCR0);
+
+ clk_bulk_disable_unprepare(smmu->num_clks, smmu->clks);
+
return 0;
}
@@ -2244,15 +2280,50 @@ static void arm_smmu_device_shutdown(struct platform_device *pdev)
arm_smmu_device_remove(pdev);
}
-static int __maybe_unused arm_smmu_pm_resume(struct device *dev)
+static int __maybe_unused arm_smmu_runtime_resume(struct device *dev)
{
struct arm_smmu_device *smmu = dev_get_drvdata(dev);
+ int ret;
+
+ ret = clk_bulk_enable(smmu->num_clks, smmu->clks);
+ if (ret)
+ return ret;
arm_smmu_device_reset(smmu);
+
return 0;
}
-static SIMPLE_DEV_PM_OPS(arm_smmu_pm_ops, NULL, arm_smmu_pm_resume);
+static int __maybe_unused arm_smmu_runtime_suspend(struct device *dev)
+{
+ struct arm_smmu_device *smmu = dev_get_drvdata(dev);
+
+ clk_bulk_disable(smmu->num_clks, smmu->clks);
+
+ return 0;
+}
+
+static int __maybe_unused arm_smmu_pm_resume(struct device *dev)
+{
+ if (pm_runtime_suspended(dev))
+ return 0;
+
+ return arm_smmu_runtime_resume(dev);
+}
+
+static int __maybe_unused arm_smmu_pm_suspend(struct device *dev)
+{
+ if (pm_runtime_suspended(dev))
+ return 0;
+
+ return arm_smmu_runtime_suspend(dev);
+}
+
+static const struct dev_pm_ops arm_smmu_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(arm_smmu_pm_suspend, arm_smmu_pm_resume)
+ SET_RUNTIME_PM_OPS(arm_smmu_runtime_suspend,
+ arm_smmu_runtime_resume, NULL)
+};
static struct platform_driver arm_smmu_driver = {
.driver = {
--
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:[~2018-11-16 11:25 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-16 11:24 [RESEND PATCH v17 0/5] iommu/arm-smmu: Add runtime pm/sleep support Vivek Gautam
2018-11-16 11:24 ` Vivek Gautam [this message]
2018-11-16 11:24 ` [RESEND PATCH v17 2/5] iommu/arm-smmu: Invoke pm_runtime during probe, add/remove device Vivek Gautam
2018-11-21 17:37 ` Will Deacon
2018-11-22 12:02 ` Vivek Gautam
2018-11-23 18:36 ` Will Deacon
2018-11-26 6:03 ` Vivek Gautam
2018-11-26 11:26 ` Vivek Gautam
2018-11-26 19:31 ` Will Deacon
2018-11-16 11:24 ` [RESEND PATCH v17 3/5] iommu/arm-smmu: Add the device_link between masters and smmu Vivek Gautam
2018-11-16 11:24 ` [RESEND PATCH v17 4/5] dt-bindings: arm-smmu: Add bindings for qcom,smmu-v2 Vivek Gautam
2018-11-16 11:24 ` [RESEND PATCH v17 5/5] iommu/arm-smmu: Add support for qcom,smmu-v2 variant Vivek Gautam
2018-11-21 17:38 ` Will Deacon
2018-11-23 9:13 ` Vivek Gautam
2018-11-23 9:22 ` Tomasz Figa
2018-11-23 9:36 ` Vivek Gautam
2018-11-23 18:34 ` Will Deacon
2018-11-26 4:02 ` Tomasz Figa
2018-11-26 10:55 ` Vivek Gautam
2018-11-26 14:41 ` Thor Thayer
2018-11-26 17:55 ` Vivek Gautam
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