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Date: Mon, 29 Jul 2019 17:36:53 +0300
From: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To: Suzuki K Poulose <suzuki.poulose@....com>
Cc: linux-kernel@...r.kernel.org, gregkh@...uxfoundation.org,
rafael@...nel.org, linux-arm-kernel@...ts.infradead.org,
"David S. Miller" <davem@...emloft.net>,
Doug Ledford <dledford@...hat.com>,
Jason Gunthorpe <jgg@...pe.ca>, linux-usb@...r.kernel.org,
Ulf Hansson <ulf.hansson@...aro.org>,
Joe Perches <joe@...ches.com>,
Mathieu Poirier <mathieu.poirier@...aro.org>,
Will Deacon <will.deacon@....com>,
Robin Murphy <robin.murphy@....com>,
Joerg Roedel <joro@...tes.org>
Subject: Re: [PATCH v3 3/7] drivers: Introduce device lookup variants by
fwnode
On Tue, Jul 23, 2019 at 11:18:34PM +0100, Suzuki K Poulose wrote:
> Add a helper to match the firmware node handle of a device and provide
> wrappers for {bus/class/driver}_find_device() APIs to avoid proliferation
> of duplicate custom match functions.
>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: Doug Ledford <dledford@...hat.com>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> Cc: Jason Gunthorpe <jgg@...pe.ca>
> Cc: linux-usb@...r.kernel.org
> Cc: "Rafael J. Wysocki" <rafael@...nel.org>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: Ulf Hansson <ulf.hansson@...aro.org>
> Cc: Joe Perches <joe@...ches.com>
> Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
> Cc: Will Deacon <will.deacon@....com>
> Cc: Robin Murphy <robin.murphy@....com>
> Cc: Joerg Roedel <joro@...tes.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> ---
> drivers/base/core.c | 6 +++
> drivers/base/devcon.c | 8 +---
> .../hwtracing/coresight/coresight-platform.c | 11 +-----
> drivers/hwtracing/coresight/coresight-priv.h | 2 -
> drivers/hwtracing/coresight/coresight.c | 4 +-
> drivers/infiniband/hw/hns/hns_roce_hw_v1.c | 8 +---
> drivers/iommu/arm-smmu-v3.c | 9 +----
> drivers/iommu/arm-smmu.c | 9 +----
> .../ethernet/hisilicon/hns/hns_dsaf_misc.c | 8 +---
> drivers/usb/roles/class.c | 8 +---
> drivers/usb/typec/class.c | 8 +---
> include/linux/device.h | 39 +++++++++++++++++++
> 12 files changed, 57 insertions(+), 63 deletions(-)
>
> diff --git a/drivers/base/core.c b/drivers/base/core.c
> index fb83647d685a..e8f81a667545 100644
> --- a/drivers/base/core.c
> +++ b/drivers/base/core.c
> @@ -3368,3 +3368,9 @@ int device_match_of_node(struct device *dev, const void *np)
> return dev->of_node == np;
> }
> EXPORT_SYMBOL_GPL(device_match_of_node);
> +
> +int device_match_fwnode(struct device *dev, const void *fwnode)
> +{
> + return dev_fwnode(dev) == fwnode;
> +}
> +EXPORT_SYMBOL_GPL(device_match_fwnode);
> diff --git a/drivers/base/devcon.c b/drivers/base/devcon.c
> index 09f28479b243..1d488dc5dd0c 100644
> --- a/drivers/base/devcon.c
> +++ b/drivers/base/devcon.c
> @@ -133,19 +133,13 @@ static struct bus_type *generic_match_buses[] = {
> NULL,
> };
>
> -static int device_fwnode_match(struct device *dev, const void *fwnode)
> -{
> - return dev_fwnode(dev) == fwnode;
> -}
> -
> static void *device_connection_fwnode_match(struct device_connection *con)
> {
> struct bus_type *bus;
> struct device *dev;
>
> for (bus = generic_match_buses[0]; bus; bus++) {
> - dev = bus_find_device(bus, NULL, (void *)con->fwnode,
> - device_fwnode_match);
> + dev = bus_find_device_by_fwnode(bus, con->fwnode);
> if (dev && !strncmp(dev_name(dev), con->id, strlen(con->id)))
> return dev;
>
> diff --git a/drivers/hwtracing/coresight/coresight-platform.c b/drivers/hwtracing/coresight/coresight-platform.c
> index dad7d96c5943..3c5bee429105 100644
> --- a/drivers/hwtracing/coresight/coresight-platform.c
> +++ b/drivers/hwtracing/coresight/coresight-platform.c
> @@ -37,11 +37,6 @@ static int coresight_alloc_conns(struct device *dev,
> return 0;
> }
>
> -int coresight_device_fwnode_match(struct device *dev, const void *fwnode)
> -{
> - return dev_fwnode(dev) == fwnode;
> -}
> -
> static struct device *
> coresight_find_device_by_fwnode(struct fwnode_handle *fwnode)
> {
> @@ -51,8 +46,7 @@ coresight_find_device_by_fwnode(struct fwnode_handle *fwnode)
> * If we have a non-configurable replicator, it will be found on the
> * platform bus.
> */
> - dev = bus_find_device(&platform_bus_type, NULL,
> - fwnode, coresight_device_fwnode_match);
> + dev = bus_find_device_by_fwnode(&platform_bus_type, fwnode);
> if (dev)
> return dev;
>
> @@ -60,8 +54,7 @@ coresight_find_device_by_fwnode(struct fwnode_handle *fwnode)
> * We have a configurable component - circle through the AMBA bus
> * looking for the device that matches the endpoint node.
> */
> - return bus_find_device(&amba_bustype, NULL,
> - fwnode, coresight_device_fwnode_match);
> + return bus_find_device_by_fwnode(&amba_bustype, fwnode);
> }
>
> #ifdef CONFIG_OF
> diff --git a/drivers/hwtracing/coresight/coresight-priv.h b/drivers/hwtracing/coresight/coresight-priv.h
> index 7d401790dd7e..61d7f9ff054d 100644
> --- a/drivers/hwtracing/coresight/coresight-priv.h
> +++ b/drivers/hwtracing/coresight/coresight-priv.h
> @@ -202,6 +202,4 @@ static inline void *coresight_get_uci_data(const struct amba_id *id)
>
> void coresight_release_platform_data(struct coresight_platform_data *pdata);
>
> -int coresight_device_fwnode_match(struct device *dev, const void *fwnode);
> -
> #endif
> diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c
> index 55db77f6410b..6453c67a4d01 100644
> --- a/drivers/hwtracing/coresight/coresight.c
> +++ b/drivers/hwtracing/coresight/coresight.c
> @@ -1046,9 +1046,7 @@ static void coresight_fixup_device_conns(struct coresight_device *csdev)
> struct coresight_connection *conn = &csdev->pdata->conns[i];
> struct device *dev = NULL;
>
> - dev = bus_find_device(&coresight_bustype, NULL,
> - (void *)conn->child_fwnode,
> - coresight_device_fwnode_match);
> + dev = bus_find_device_by_fwnode(&coresight_bustype, conn->child_fwnode);
> if (dev) {
> conn->child_dev = to_coresight_device(dev);
> /* and put reference from 'bus_find_device()' */
> diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v1.c b/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
> index 81e6dedb1e02..fa05e943038a 100644
> --- a/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
> +++ b/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
> @@ -4499,19 +4499,13 @@ static const struct acpi_device_id hns_roce_acpi_match[] = {
> };
> MODULE_DEVICE_TABLE(acpi, hns_roce_acpi_match);
>
> -static int hns_roce_node_match(struct device *dev, const void *fwnode)
> -{
> - return dev->fwnode == fwnode;
> -}
> -
> static struct
> platform_device *hns_roce_find_pdev(struct fwnode_handle *fwnode)
> {
> struct device *dev;
>
> /* get the 'device' corresponding to the matching 'fwnode' */
> - dev = bus_find_device(&platform_bus_type, NULL,
> - fwnode, hns_roce_node_match);
> + dev = bus_find_device_by_fwnode(&platform_bus_type, fwnode);
> /* get the platform device */
> return dev ? to_platform_device(dev) : NULL;
> }
> diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
> index a9a9fabd3968..6f0e13fa5e1a 100644
> --- a/drivers/iommu/arm-smmu-v3.c
> +++ b/drivers/iommu/arm-smmu-v3.c
> @@ -2034,16 +2034,11 @@ arm_smmu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
>
> static struct platform_driver arm_smmu_driver;
>
> -static int arm_smmu_match_node(struct device *dev, const void *data)
> -{
> - return dev->fwnode == data;
> -}
> -
> static
> struct arm_smmu_device *arm_smmu_get_by_fwnode(struct fwnode_handle *fwnode)
> {
> - struct device *dev = driver_find_device(&arm_smmu_driver.driver, NULL,
> - fwnode, arm_smmu_match_node);
> + struct device *dev = driver_find_device_by_fwnode(&arm_smmu_driver.driver,
> + fwnode);
> put_device(dev);
> return dev ? dev_get_drvdata(dev) : NULL;
> }
> diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
> index 64977c131ee6..aa06498f291d 100644
> --- a/drivers/iommu/arm-smmu.c
> +++ b/drivers/iommu/arm-smmu.c
> @@ -1426,16 +1426,11 @@ static bool arm_smmu_capable(enum iommu_cap cap)
> }
> }
>
> -static int arm_smmu_match_node(struct device *dev, const void *data)
> -{
> - return dev->fwnode == data;
> -}
> -
> static
> struct arm_smmu_device *arm_smmu_get_by_fwnode(struct fwnode_handle *fwnode)
> {
> - struct device *dev = driver_find_device(&arm_smmu_driver.driver, NULL,
> - fwnode, arm_smmu_match_node);
> + struct device *dev = driver_find_device_by_fwnode(&arm_smmu_driver.driver,
> + fwnode);
> put_device(dev);
> return dev ? dev_get_drvdata(dev) : NULL;
> }
> diff --git a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_misc.c b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_misc.c
> index bb6586d0e5af..ed3829ae4ef1 100644
> --- a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_misc.c
> +++ b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_misc.c
> @@ -754,17 +754,11 @@ struct dsaf_misc_op *hns_misc_op_get(struct dsaf_device *dsaf_dev)
> return (void *)misc_op;
> }
>
> -static int hns_dsaf_dev_match(struct device *dev, const void *fwnode)
> -{
> - return dev->fwnode == fwnode;
> -}
> -
> struct
> platform_device *hns_dsaf_find_platform_device(struct fwnode_handle *fwnode)
> {
> struct device *dev;
>
> - dev = bus_find_device(&platform_bus_type, NULL,
> - fwnode, hns_dsaf_dev_match);
> + dev = bus_find_device_by_fwnode(&platform_bus_type, fwnode);
> return dev ? to_platform_device(dev) : NULL;
> }
> diff --git a/drivers/usb/roles/class.c b/drivers/usb/roles/class.c
> index c8efe60e2465..0526efbc4922 100644
> --- a/drivers/usb/roles/class.c
> +++ b/drivers/usb/roles/class.c
> @@ -85,11 +85,6 @@ enum usb_role usb_role_switch_get_role(struct usb_role_switch *sw)
> }
> EXPORT_SYMBOL_GPL(usb_role_switch_get_role);
>
> -static int switch_fwnode_match(struct device *dev, const void *fwnode)
> -{
> - return dev_fwnode(dev) == fwnode;
> -}
> -
> static void *usb_role_switch_match(struct device_connection *con, int ep,
> void *data)
> {
> @@ -99,8 +94,7 @@ static void *usb_role_switch_match(struct device_connection *con, int ep,
> if (con->id && !fwnode_property_present(con->fwnode, con->id))
> return NULL;
>
> - dev = class_find_device(role_class, NULL, con->fwnode,
> - switch_fwnode_match);
> + dev = class_find_device_by_fwnode(role_class, con->fwnode);
> } else {
> dev = class_find_device_by_name(role_class, con->endpoint[ep]);
> }
> diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
> index 9b0d15b487e5..94a3eda62add 100644
> --- a/drivers/usb/typec/class.c
> +++ b/drivers/usb/typec/class.c
> @@ -205,11 +205,6 @@ static void typec_altmode_put_partner(struct altmode *altmode)
> put_device(&adev->dev);
> }
>
> -static int typec_port_fwnode_match(struct device *dev, const void *fwnode)
> -{
> - return dev_fwnode(dev) == fwnode;
> -}
> -
> static void *typec_port_match(struct device_connection *con, int ep, void *data)
> {
> struct device *dev;
> @@ -219,8 +214,7 @@ static void *typec_port_match(struct device_connection *con, int ep, void *data)
> * we need to return ERR_PTR(-PROBE_DEFER) when there is no device.
> */
> if (con->fwnode)
> - return class_find_device(typec_class, NULL, con->fwnode,
> - typec_port_fwnode_match);
> + return class_find_device_by_fwnode(typec_class, con->fwnode);
>
> dev = class_find_device_by_name(typec_class, con->endpoint[ep]);
>
> diff --git a/include/linux/device.h b/include/linux/device.h
> index 29d8d7ad41e6..7133fc1c285d 100644
> --- a/include/linux/device.h
> +++ b/include/linux/device.h
> @@ -166,6 +166,7 @@ void subsys_dev_iter_exit(struct subsys_dev_iter *iter);
>
> int device_match_name(struct device *dev, const void *name);
> int device_match_of_node(struct device *dev, const void *np);
> +int device_match_fwnode(struct device *dev, const void *fwnode);
>
> int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
> int (*fn)(struct device *dev, void *data));
> @@ -198,6 +199,18 @@ bus_find_device_by_of_node(struct bus_type *bus, const struct device_node *np)
> return bus_find_device(bus, NULL, np, device_match_of_node);
> }
>
> +/**
> + * bus_find_device_by_fwnode : device iterator for locating a particular device
> + * matching the fwnode.
> + * @bus: bus type
> + * @fwnode: fwnode of the device to match.
> + */
> +static inline struct device *
> +bus_find_device_by_fwnode(struct bus_type *bus, const struct fwnode_handle *fwnode)
> +{
> + return bus_find_device(bus, NULL, fwnode, device_match_fwnode);
> +}
> +
> struct device *subsys_find_device_by_id(struct bus_type *bus, unsigned int id,
> struct device *hint);
> int bus_for_each_drv(struct bus_type *bus, struct device_driver *start,
> @@ -391,6 +404,19 @@ driver_find_device_by_of_node(struct device_driver *drv,
> return driver_find_device(drv, NULL, np, device_match_of_node);
> }
>
> +/**
> + * driver_find_device_by_fwnode- device iterator for locating a particular device
> + * by fwnode pointer.
> + * @driver: the driver we're iterating
> + * @fwnode: fwnode pointer to match.
> + */
> +static inline struct device *
> +driver_find_device_by_fwnode(struct device_driver *drv,
> + const struct fwnode_handle *fwnode)
> +{
> + return driver_find_device(drv, NULL, fwnode, device_match_fwnode);
> +}
> +
> void driver_deferred_probe_add(struct device *dev);
> int driver_deferred_probe_check_state(struct device *dev);
> int driver_deferred_probe_check_state_continue(struct device *dev);
> @@ -544,6 +570,19 @@ class_find_device_by_of_node(struct class *class, const struct device_node *np)
> return class_find_device(class, NULL, np, device_match_of_node);
> }
>
> +/**
> + * class_find_device_by_fwnode : device iterator for locating a particular device
> + * matching the fwnode.
> + * @class: class type
> + * @fwnode: fwnode of the device to match.
> + */
> +static inline struct device *
> +class_find_device_by_fwnode(struct class *class,
> + const struct fwnode_handle *fwnode)
> +{
> + return class_find_device(class, NULL, fwnode, device_match_fwnode);
> +}
> +
> struct class_attribute {
> struct attribute attr;
> ssize_t (*show)(struct class *class, struct class_attribute *attr,
> --
> 2.21.0
thanks,
--
heikki
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