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Message-ID: <1a3b368eb891ca55c33265397cffab0b9f128737.camel@mediatek.com>
Date: Tue, 11 Jan 2022 20:22:23 +0800
From: Yong Wu <yong.wu@...iatek.com>
To: Stephen Boyd <swboyd@...omium.org>
CC: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Douglas Anderson <dianders@...omium.org>,
<linux-kernel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
<dri-devel@...ts.freedesktop.org>,
<freedreno@...ts.freedesktop.org>, Joerg Roedel <joro@...tes.org>,
"Will Deacon" <will@...nel.org>,
Daniel Vetter <daniel.vetter@...ll.ch>,
"Rafael J. Wysocki" <rafael@...nel.org>,
Rob Clark <robdclark@...il.com>,
"Russell King" <rmk+kernel@....linux.org.uk>,
Saravana Kannan <saravanak@...gle.com>,
<linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH v5 25/32] iommu/mtk: Migrate to aggregate driver
Hi Stephen,
Thanks for helping update here.
On Thu, 2022-01-06 at 13:45 -0800, Stephen Boyd wrote:
> Use an aggregate driver instead of component ops so that we can get
> proper driver probe ordering of the aggregate device with respect to
> all
> the component devices that make up the aggregate device.
>
> Cc: Yong Wu <yong.wu@...iatek.com>
> Cc: Joerg Roedel <joro@...tes.org>
> Cc: Will Deacon <will@...nel.org>
> Cc: Daniel Vetter <daniel.vetter@...ll.ch>
> Cc: "Rafael J. Wysocki" <rafael@...nel.org>
> Cc: Rob Clark <robdclark@...il.com>
> Cc: Russell King <rmk+kernel@....linux.org.uk>
> Cc: Saravana Kannan <saravanak@...gle.com>
> Signed-off-by: Stephen Boyd <swboyd@...omium.org>
When I test this on mt8195 which have two IOMMU HWs(calling
component_aggregate_regsiter twice), it will abort like this. Then what
should we do if we have two instances?
Thanks.
[ 2.652424] Error: Driver 'mtk_iommu_agg' is already registered,
aborting...
[ 2.654033] mtk-iommu: probe of 1c01f000.iommu failed with error -16
[ 2.662034] Unable to handle kernel NULL pointer dereference at
virtual address 0000000000000020
...
[ 2.672413] pc : aggregate_device_match+0xa8/0x1c8
[ 2.673027] lr : aggregate_device_match+0x68/0x1c8
...
[ 2.683091] Call trace:
[ 2.683403] aggregate_device_match+0xa8/0x1c8
[ 2.683970] __device_attach_driver+0x38/0xd0
[ 2.684526] bus_for_each_drv+0x68/0xd0
[ 2.685015] __device_attach+0xec/0x148
[ 2.685503] device_attach+0x14/0x20
[ 2.685960] bus_rescan_devices_helper+0x50/0x90
[ 2.686545] bus_for_each_dev+0x7c/0xd8
[ 2.687033] bus_rescan_devices+0x20/0x30
[ 2.687542] __component_add+0x7c/0xa0
[ 2.688022] component_add+0x14/0x20
[ 2.688479] mtk_smi_larb_probe+0xe0/0x120
> ---
> drivers/iommu/mtk_iommu.c | 14 +++++++++-----
> drivers/iommu/mtk_iommu.h | 6 ++++--
> drivers/iommu/mtk_iommu_v1.c | 14 +++++++++-----
> 3 files changed, 22 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
> index 25b834104790..8e722898cbe2 100644
> --- a/drivers/iommu/mtk_iommu.c
> +++ b/drivers/iommu/mtk_iommu.c
> @@ -752,9 +752,13 @@ static int mtk_iommu_hw_init(const struct
> mtk_iommu_data *data)
> return 0;
> }
>
> -static const struct component_master_ops mtk_iommu_com_ops = {
> - .bind = mtk_iommu_bind,
> - .unbind = mtk_iommu_unbind,
> +static struct aggregate_driver mtk_iommu_aggregate_driver = {
> + .probe = mtk_iommu_bind,
> + .remove = mtk_iommu_unbind,
> + .driver = {
> + .name = "mtk_iommu_agg",
> + .owner = THIS_MODULE,
> + },
> };
>
> static int mtk_iommu_probe(struct platform_device *pdev)
> @@ -895,7 +899,7 @@ static int mtk_iommu_probe(struct platform_device
> *pdev)
> goto out_list_del;
> }
>
> - ret = component_master_add_with_match(dev, &mtk_iommu_com_ops,
> match);
> + ret = component_aggregate_register(dev,
> &mtk_iommu_aggregate_driver, match);
> if (ret)
> goto out_bus_set_null;
> return ret;
> @@ -928,7 +932,7 @@ static int mtk_iommu_remove(struct
> platform_device *pdev)
> device_link_remove(data->smicomm_dev, &pdev->dev);
> pm_runtime_disable(&pdev->dev);
> devm_free_irq(&pdev->dev, data->irq, data);
> - component_master_del(&pdev->dev, &mtk_iommu_com_ops);
> + component_aggregate_unregister(&pdev->dev,
> &mtk_iommu_aggregate_driver);
> return 0;
> }
>
> diff --git a/drivers/iommu/mtk_iommu.h b/drivers/iommu/mtk_iommu.h
> index f81fa8862ed0..064fd4f4eade 100644
> --- a/drivers/iommu/mtk_iommu.h
> +++ b/drivers/iommu/mtk_iommu.h
> @@ -94,15 +94,17 @@ static inline void release_of(struct device *dev,
> void *data)
> of_node_put(data);
> }
>
> -static inline int mtk_iommu_bind(struct device *dev)
> +static inline int mtk_iommu_bind(struct aggregate_device *adev)
> {
> + struct device *dev = adev->parent;
> struct mtk_iommu_data *data = dev_get_drvdata(dev);
>
> return component_bind_all(dev, &data->larb_imu);
> }
>
> -static inline void mtk_iommu_unbind(struct device *dev)
> +static inline void mtk_iommu_unbind(struct aggregate_device *adev)
> {
> + struct device *dev = adev->parent;
> struct mtk_iommu_data *data = dev_get_drvdata(dev);
>
> component_unbind_all(dev, &data->larb_imu);
> diff --git a/drivers/iommu/mtk_iommu_v1.c
> b/drivers/iommu/mtk_iommu_v1.c
> index be22fcf988ce..5fb29058a165 100644
> --- a/drivers/iommu/mtk_iommu_v1.c
> +++ b/drivers/iommu/mtk_iommu_v1.c
> @@ -534,9 +534,13 @@ static const struct of_device_id
> mtk_iommu_of_ids[] = {
> {}
> };
>
> -static const struct component_master_ops mtk_iommu_com_ops = {
> - .bind = mtk_iommu_bind,
> - .unbind = mtk_iommu_unbind,
> +static struct aggregate_driver mtk_iommu_aggregate_driver = {
> + .probe = mtk_iommu_bind,
> + .remove = mtk_iommu_unbind,
> + .driver = {
> + .name = "mtk_iommu_agg",
> + .owner = THIS_MODULE,
> + },
> };
>
> static int mtk_iommu_probe(struct platform_device *pdev)
> @@ -624,7 +628,7 @@ static int mtk_iommu_probe(struct platform_device
> *pdev)
> goto out_dev_unreg;
> }
>
> - ret = component_master_add_with_match(dev, &mtk_iommu_com_ops,
> match);
> + ret = component_aggregate_register(dev,
> &mtk_iommu_aggregate_driver, match);
> if (ret)
> goto out_bus_set_null;
> return ret;
> @@ -650,7 +654,7 @@ static int mtk_iommu_remove(struct
> platform_device *pdev)
>
> clk_disable_unprepare(data->bclk);
> devm_free_irq(&pdev->dev, data->irq, data);
> - component_master_del(&pdev->dev, &mtk_iommu_com_ops);
> + component_aggregate_unregister(&pdev->dev,
> &mtk_iommu_aggregate_driver);
> return 0;
> }
>
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