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Wysocki" Date: Thu, 20 May 2021 20:22:37 +0200 Message-ID: Subject: Re: [PATCH v4 1/8] ACPI: scan: Extend acpi_walk_dep_device_list() To: Daniel Scally Cc: "Rafael J . Wysocki" , Andy Shevchenko , Wolfram Sang , Lee Jones , Hans de Goede , Maximilian Luz , Linux Kernel Mailing List , ACPI Devel Maling List , Linux ARM , "open list:GPIO SUBSYSTEM" , linux-i2c , Platform Driver , "open list:ACPI COMPONENT ARCHITECTURE (ACPICA)" , Len Brown , Mika Westerberg , Russell King , Linus Walleij , Bartosz Golaszewski , Mark Gross , Robert Moore , Erik Kaneda , Laurent Pinchart , Kieran Bingham X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210520_112250_853625_4E3368A6 X-CRM114-Status: GOOD ( 43.65 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, May 20, 2021 at 4:11 PM Daniel Scally wrote: > > The acpi_walk_dep_device_list() is not as generalisable as its name > implies, serving only to decrement the dependency count for each > dependent device of the input. Extend the function to instead accept > a callback which can be applied to all the dependencies in acpi_dep_list. > Replace all existing calls to the function with calls to a wrapper, passing > a callback that applies the same dependency reduction. > > Signed-off-by: Daniel Scally LGTM, but I will have changes depending on it. If that's fine by Hans, I'll take this one and expose it in a git branch that won't be rebased. > --- > changes since v3: > > - Most of the functions got renamed > - acpi_dev_get_dependent_dev() was altered to take a struct acpi_device > This had some repurcussions in the other files, mostly switching from > ACPI_HANDLE() to ACPI_COMPANION(). > - acpi_walk_dep_device_list() was altered to check the return value of > the callback on each iteration of the loop, to allow for error handling > of the callbacks or breaking the loop early to save time. Andy, Wolfram, > I thought this change was significant enough to drop your R-b and Ack. > > drivers/acpi/ec.c | 2 +- > drivers/acpi/pmic/intel_pmic_chtdc_ti.c | 2 +- > drivers/acpi/scan.c | 69 ++++++++++++++----- > drivers/gpio/gpiolib-acpi.c | 10 +-- > drivers/i2c/i2c-core-acpi.c | 8 +-- > drivers/platform/surface/aggregator/core.c | 6 +- > drivers/platform/surface/surface3_power.c | 22 +++--- > .../platform/surface/surface_acpi_notify.c | 7 +- > include/acpi/acpi_bus.h | 7 ++ > include/linux/acpi.h | 4 +- > 10 files changed, 90 insertions(+), 47 deletions(-) > > diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c > index 13565629ce0a..3f7680a007a3 100644 > --- a/drivers/acpi/ec.c > +++ b/drivers/acpi/ec.c > @@ -1627,7 +1627,7 @@ static int acpi_ec_add(struct acpi_device *device) > WARN(!ret, "Could not request EC cmd io port 0x%lx", ec->command_addr); > > /* Reprobe devices depending on the EC */ > - acpi_walk_dep_device_list(ec->handle); > + acpi_dev_clear_dependencies(device); > > acpi_handle_debug(ec->handle, "enumerated.\n"); > return 0; > diff --git a/drivers/acpi/pmic/intel_pmic_chtdc_ti.c b/drivers/acpi/pmic/intel_pmic_chtdc_ti.c > index a5101b07611a..fef7831d0d63 100644 > --- a/drivers/acpi/pmic/intel_pmic_chtdc_ti.c > +++ b/drivers/acpi/pmic/intel_pmic_chtdc_ti.c > @@ -117,7 +117,7 @@ static int chtdc_ti_pmic_opregion_probe(struct platform_device *pdev) > return err; > > /* Re-enumerate devices depending on PMIC */ > - acpi_walk_dep_device_list(ACPI_HANDLE(pdev->dev.parent)); > + acpi_dev_clear_dependencies(ACPI_COMPANION(pdev->dev.parent)); > return 0; > } > > diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c > index 453eff8ec8c3..195635c3462b 100644 > --- a/drivers/acpi/scan.c > +++ b/drivers/acpi/scan.c > @@ -47,12 +47,6 @@ static DEFINE_MUTEX(acpi_hp_context_lock); > */ > static u64 spcr_uart_addr; > > -struct acpi_dep_data { > - struct list_head node; > - acpi_handle supplier; > - acpi_handle consumer; > -}; > - > void acpi_scan_lock_acquire(void) > { > mutex_lock(&acpi_scan_lock); > @@ -2111,30 +2105,69 @@ static void acpi_bus_attach(struct acpi_device *device, bool first_pass) > device->handler->hotplug.notify_online(device); > } > > -void acpi_walk_dep_device_list(acpi_handle handle) > +static int acpi_scan_clear_dep(struct acpi_dep_data *dep, void *data) > { > - struct acpi_dep_data *dep, *tmp; > struct acpi_device *adev; > > + acpi_bus_get_device(dep->consumer, &adev); > + > + if (adev) { > + adev->dep_unmet--; > + if (!adev->dep_unmet) > + acpi_bus_attach(adev, true); > + } > + > + list_del(&dep->node); > + kfree(dep); > + > + return 0; > +} > + > +/** > + * acpi_walk_dep_device_list - Apply a callback to every entry in acpi_dep_list > + * @handle: The ACPI handle of the supplier device > + * @callback: Pointer to the callback function to apply > + * @data: Pointer to some data to pass to the callback > + * > + * The return value of the callback determines this function's behaviour. If 0 > + * is returned we continue to iterate over acpi_dep_list. If a positive value > + * is returned then the loop is broken but this function returns 0. If a > + * negative value is returned by the callback then the loop is broken and that > + * value is returned as the final error. > + */ > +int acpi_walk_dep_device_list(acpi_handle handle, > + int (*callback)(struct acpi_dep_data *, void *), > + void *data) > +{ > + struct acpi_dep_data *dep, *tmp; > + int ret; > + > mutex_lock(&acpi_dep_list_lock); > list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) { > if (dep->supplier == handle) { > - acpi_bus_get_device(dep->consumer, &adev); > - > - if (adev) { > - adev->dep_unmet--; > - if (!adev->dep_unmet) > - acpi_bus_attach(adev, true); > - } > - > - list_del(&dep->node); > - kfree(dep); > + ret = callback(dep, data); > + if (ret) > + break; > } > } > mutex_unlock(&acpi_dep_list_lock); > + > + return ret > 0 ? 0 : ret; > } > EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list); > > +/** > + * acpi_dev_clear_dependencies - Inform consumers that the device is now active > + * @supplier: Pointer to the supplier &struct acpi_device > + * > + * Clear dependencies on the given device. > + */ > +void acpi_dev_clear_dependencies(struct acpi_device *supplier) > +{ > + acpi_walk_dep_device_list(supplier->handle, acpi_scan_clear_dep, NULL); > +} > +EXPORT_SYMBOL_GPL(acpi_dev_clear_dependencies); > + > /** > * acpi_bus_scan - Add ACPI device node objects in a given namespace scope. > * @handle: Root of the namespace scope to scan. > diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c > index 3ef22a3c104d..5b4111e4be3f 100644 > --- a/drivers/gpio/gpiolib-acpi.c > +++ b/drivers/gpio/gpiolib-acpi.c > @@ -1233,14 +1233,14 @@ static void acpi_gpiochip_scan_gpios(struct acpi_gpio_chip *achip) > void acpi_gpiochip_add(struct gpio_chip *chip) > { > struct acpi_gpio_chip *acpi_gpio; > - acpi_handle handle; > + struct acpi_device *adev; > acpi_status status; > > if (!chip || !chip->parent) > return; > > - handle = ACPI_HANDLE(chip->parent); > - if (!handle) > + adev = ACPI_COMPANION(chip->parent); > + if (!adev) > return; > > acpi_gpio = kzalloc(sizeof(*acpi_gpio), GFP_KERNEL); > @@ -1254,7 +1254,7 @@ void acpi_gpiochip_add(struct gpio_chip *chip) > INIT_LIST_HEAD(&acpi_gpio->events); > INIT_LIST_HEAD(&acpi_gpio->deferred_req_irqs_list_entry); > > - status = acpi_attach_data(handle, acpi_gpio_chip_dh, acpi_gpio); > + status = acpi_attach_data(adev->handle, acpi_gpio_chip_dh, acpi_gpio); > if (ACPI_FAILURE(status)) { > dev_err(chip->parent, "Failed to attach ACPI GPIO chip\n"); > kfree(acpi_gpio); > @@ -1263,7 +1263,7 @@ void acpi_gpiochip_add(struct gpio_chip *chip) > > acpi_gpiochip_request_regions(acpi_gpio); > acpi_gpiochip_scan_gpios(acpi_gpio); > - acpi_walk_dep_device_list(handle); > + acpi_dev_clear_dependencies(adev); > } > > void acpi_gpiochip_remove(struct gpio_chip *chip) > diff --git a/drivers/i2c/i2c-core-acpi.c b/drivers/i2c/i2c-core-acpi.c > index 8ceaa88dd78f..6f0aa0ed3241 100644 > --- a/drivers/i2c/i2c-core-acpi.c > +++ b/drivers/i2c/i2c-core-acpi.c > @@ -259,8 +259,8 @@ static acpi_status i2c_acpi_add_device(acpi_handle handle, u32 level, > */ > void i2c_acpi_register_devices(struct i2c_adapter *adap) > { > + struct acpi_device *adev; > acpi_status status; > - acpi_handle handle; > > if (!has_acpi_companion(&adap->dev)) > return; > @@ -275,11 +275,11 @@ void i2c_acpi_register_devices(struct i2c_adapter *adap) > if (!adap->dev.parent) > return; > > - handle = ACPI_HANDLE(adap->dev.parent); > - if (!handle) > + adev = ACPI_COMPANION(adap->dev.parent); > + if (!adev) > return; > > - acpi_walk_dep_device_list(handle); > + acpi_dev_clear_dependencies(adev); > } > > static const struct acpi_device_id i2c_acpi_force_400khz_device_ids[] = { > diff --git a/drivers/platform/surface/aggregator/core.c b/drivers/platform/surface/aggregator/core.c > index 8dc2c267bcd6..517f774a6e60 100644 > --- a/drivers/platform/surface/aggregator/core.c > +++ b/drivers/platform/surface/aggregator/core.c > @@ -621,8 +621,8 @@ static const struct acpi_gpio_mapping ssam_acpi_gpios[] = { > > static int ssam_serial_hub_probe(struct serdev_device *serdev) > { > + struct acpi_device *ssh = ACPI_COMPANION(&serdev->dev); > struct ssam_controller *ctrl; > - acpi_handle *ssh = ACPI_HANDLE(&serdev->dev); > acpi_status astatus; > int status; > > @@ -652,7 +652,7 @@ static int ssam_serial_hub_probe(struct serdev_device *serdev) > if (status) > goto err_devopen; > > - astatus = ssam_serdev_setup_via_acpi(ssh, serdev); > + astatus = ssam_serdev_setup_via_acpi(ssh->handle, serdev); > if (ACPI_FAILURE(astatus)) { > status = -ENXIO; > goto err_devinit; > @@ -706,7 +706,7 @@ static int ssam_serial_hub_probe(struct serdev_device *serdev) > * For now let's thus default power/wakeup to false. > */ > device_set_wakeup_capable(&serdev->dev, true); > - acpi_walk_dep_device_list(ssh); > + acpi_dev_clear_dependencies(ssh); > > return 0; > > diff --git a/drivers/platform/surface/surface3_power.c b/drivers/platform/surface/surface3_power.c > index cc4f9cba6856..dea82aa1abd4 100644 > --- a/drivers/platform/surface/surface3_power.c > +++ b/drivers/platform/surface/surface3_power.c > @@ -446,12 +446,12 @@ mshw0011_space_handler(u32 function, acpi_physical_address command, > > static int mshw0011_install_space_handler(struct i2c_client *client) > { > - acpi_handle handle; > + struct acpi_device *adev; > struct mshw0011_handler_data *data; > acpi_status status; > > - handle = ACPI_HANDLE(&client->dev); > - if (!handle) > + adev = ACPI_COMPANION(&client->dev); > + if (!adev) > return -ENODEV; > > data = kzalloc(sizeof(struct mshw0011_handler_data), > @@ -460,25 +460,25 @@ static int mshw0011_install_space_handler(struct i2c_client *client) > return -ENOMEM; > > data->client = client; > - status = acpi_bus_attach_private_data(handle, (void *)data); > + status = acpi_bus_attach_private_data(adev->handle, (void *)data); > if (ACPI_FAILURE(status)) { > kfree(data); > return -ENOMEM; > } > > - status = acpi_install_address_space_handler(handle, > - ACPI_ADR_SPACE_GSBUS, > - &mshw0011_space_handler, > - NULL, > - data); > + status = acpi_install_address_space_handler(adev->handle, > + ACPI_ADR_SPACE_GSBUS, > + &mshw0011_space_handler, > + NULL, > + data); > if (ACPI_FAILURE(status)) { > dev_err(&client->dev, "Error installing i2c space handler\n"); > - acpi_bus_detach_private_data(handle); > + acpi_bus_detach_private_data(adev->handle); > kfree(data); > return -ENOMEM; > } > > - acpi_walk_dep_device_list(handle); > + acpi_dev_clear_dependencies(adev); > return 0; > } > > diff --git a/drivers/platform/surface/surface_acpi_notify.c b/drivers/platform/surface/surface_acpi_notify.c > index ef9c1f8e8336..8339988d95c1 100644 > --- a/drivers/platform/surface/surface_acpi_notify.c > +++ b/drivers/platform/surface/surface_acpi_notify.c > @@ -798,7 +798,7 @@ static int san_consumer_links_setup(struct platform_device *pdev) > > static int san_probe(struct platform_device *pdev) > { > - acpi_handle san = ACPI_HANDLE(&pdev->dev); > + struct acpi_device *san = ACPI_COMPANION(&pdev->dev); > struct ssam_controller *ctrl; > struct san_data *data; > acpi_status astatus; > @@ -821,7 +821,8 @@ static int san_probe(struct platform_device *pdev) > > platform_set_drvdata(pdev, data); > > - astatus = acpi_install_address_space_handler(san, ACPI_ADR_SPACE_GSBUS, > + astatus = acpi_install_address_space_handler(san->handle, > + ACPI_ADR_SPACE_GSBUS, > &san_opreg_handler, NULL, > &data->info); > if (ACPI_FAILURE(astatus)) > @@ -835,7 +836,7 @@ static int san_probe(struct platform_device *pdev) > if (status) > goto err_install_dev; > > - acpi_walk_dep_device_list(san); > + acpi_dev_clear_dependencies(san); > return 0; > > err_install_dev: > diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h > index 3a82faac5767..0b2c4f170f4d 100644 > --- a/include/acpi/acpi_bus.h > +++ b/include/acpi/acpi_bus.h > @@ -280,6 +280,12 @@ struct acpi_device_power { > struct acpi_device_power_state states[ACPI_D_STATE_COUNT]; /* Power states (D0-D3Cold) */ > }; > > +struct acpi_dep_data { > + struct list_head node; > + acpi_handle supplier; > + acpi_handle consumer; > +}; > + > /* Performance Management */ > > struct acpi_device_perf_flags { > @@ -685,6 +691,7 @@ static inline bool acpi_device_can_poweroff(struct acpi_device *adev) > > bool acpi_dev_hid_uid_match(struct acpi_device *adev, const char *hid2, const char *uid2); > > +void acpi_dev_clear_dependencies(struct acpi_device *supplier); > struct acpi_device * > acpi_dev_get_next_match_dev(struct acpi_device *adev, const char *hid, const char *uid, s64 hrv); > struct acpi_device * > diff --git a/include/linux/acpi.h b/include/linux/acpi.h > index c60745f657e9..170b9bebdb2b 100644 > --- a/include/linux/acpi.h > +++ b/include/linux/acpi.h > @@ -666,7 +666,9 @@ extern bool acpi_driver_match_device(struct device *dev, > const struct device_driver *drv); > int acpi_device_uevent_modalias(struct device *, struct kobj_uevent_env *); > int acpi_device_modalias(struct device *, char *, int); > -void acpi_walk_dep_device_list(acpi_handle handle); > +int acpi_walk_dep_device_list(acpi_handle handle, > + int (*callback)(struct acpi_dep_data *, void *), > + void *data); > > struct platform_device *acpi_create_platform_device(struct acpi_device *, > struct property_entry *); > -- > 2.25.1 > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel