From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: Daniel Scally <djrscally@gmail.com>
Cc: linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org,
linux-gpio@vger.kernel.org, linux-i2c@vger.kernel.org,
platform-driver-x86@vger.kernel.org, devel@acpica.org,
rjw@rjwysocki.net, lenb@kernel.org, andy@kernel.org,
mika.westerberg@linux.intel.com, linus.walleij@linaro.org,
bgolaszewski@baylibre.com, wsa@kernel.org, lee.jones@linaro.org,
hdegoede@redhat.com, mgross@linux.intel.com,
robert.moore@intel.com, erik.kaneda@intel.com,
sakari.ailus@linux.intel.com, andriy.shevchenko@linux.intel.com,
kieran.bingham@ideasonboard.com
Subject: Re: [PATCH v2 2/7] acpi: utils: Add function to fetch dependent acpi_devices
Date: Mon, 18 Jan 2021 09:34:04 +0200 [thread overview]
Message-ID: <YAU57AEmtBHuz6T8@pendragon.ideasonboard.com> (raw)
In-Reply-To: <20210118003428.568892-3-djrscally@gmail.com>
Hi Daniel,
Thank you for the patch.
On Mon, Jan 18, 2021 at 12:34:23AM +0000, Daniel Scally wrote:
> In some ACPI tables we encounter, devices use the _DEP method to assert
> a dependence on other ACPI devices as opposed to the OpRegions that the
> specification intends. We need to be able to find those devices "from"
> the dependee, so add a function to parse all ACPI Devices and check if
> the include the handle of the dependee device in their _DEP buffer.
>
> Signed-off-by: Daniel Scally <djrscally@gmail.com>
> ---
> Changes in v2:
> - Used acpi_lpss_dep() as Andy suggested.
>
> drivers/acpi/utils.c | 34 ++++++++++++++++++++++++++++++++++
> include/acpi/acpi_bus.h | 2 ++
> 2 files changed, 36 insertions(+)
>
> diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
> index 78b38775f18b..ec6a2406a886 100644
> --- a/drivers/acpi/utils.c
> +++ b/drivers/acpi/utils.c
> @@ -831,6 +831,18 @@ bool acpi_lpss_dep(struct acpi_device *adev, acpi_handle handle)
> return false;
> }
>
> +static int acpi_dev_match_by_dep(struct device *dev, const void *data)
> +{
> + struct acpi_device *adev = to_acpi_device(dev);
> + const struct acpi_device *dependee = data;
> + acpi_handle handle = dependee->handle;
> +
> + if (acpi_lpss_dep(adev, handle))
> + return 1;
> +
> + return 0;
> +}
> +
I think I'd move this just before acpi_dev_get_next_dep_dev() to keep
the two together.
> /**
> * acpi_dev_present - Detect that a given ACPI device is present
> * @hid: Hardware ID of the device.
> @@ -866,6 +878,28 @@ bool acpi_dev_present(const char *hid, const char *uid, s64 hrv)
> }
> EXPORT_SYMBOL(acpi_dev_present);
>
> +/**
> + * acpi_dev_get_next_dep_dev - Return next ACPI device dependent on input dev
Maybe acpi_dev_get_next_dependent_dev() ? "dep" could mean either
dependent or dependency.
> + * @adev: Pointer to the dependee device
> + * @prev: Pointer to the previous dependent device (or NULL for first match)
> + *
> + * Return the next ACPI device which declares itself dependent on @adev in
> + * the _DEP buffer.
> + *
> + * The caller is responsible to call put_device() on the returned device.
> + */
> +struct acpi_device *acpi_dev_get_next_dep_dev(struct acpi_device *adev,
> + struct acpi_device *prev)
> +{
> + struct device *start = prev ? &prev->dev : NULL;
> + struct device *dev;
> +
> + dev = bus_find_device(&acpi_bus_type, start, adev, acpi_dev_match_by_dep);
Having to loop over all ACPI devices is quite inefficient, but if we
need a reverse lookup, we don't really have a choice. We could create a
reverse map, but I don't think it's worth it.
> +
> + return dev ? to_acpi_device(dev) : NULL;
> +}
> +EXPORT_SYMBOL(acpi_dev_get_next_dep_dev);
I would have used EXPORT_SYMBOL_GPL. I'm not sure what the policy is in
the ACPI subsystem, and it's also a personal choice.
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> +
> /**
> * acpi_dev_get_next_match_dev - Return the next match of ACPI device
> * @adev: Pointer to the previous acpi_device matching this @hid, @uid and @hrv
> diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
> index 02a716a0af5d..33deb22294f2 100644
> --- a/include/acpi/acpi_bus.h
> +++ b/include/acpi/acpi_bus.h
> @@ -683,6 +683,8 @@ 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);
>
> +struct acpi_device *
> +acpi_dev_get_next_dep_dev(struct acpi_device *adev, struct acpi_device *prev);
> struct acpi_device *
> acpi_dev_get_next_match_dev(struct acpi_device *adev, const char *hid, const char *uid, s64 hrv);
> struct acpi_device *
--
Regards,
Laurent Pinchart
next prev parent reply other threads:[~2021-01-18 7:35 UTC|newest]
Thread overview: 98+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-18 0:34 [PATCH v2 0/7] Introduce intel_skl_int3472 driver Daniel Scally
2021-01-18 0:34 ` [PATCH v2 1/7] acpi: utils: move acpi_lpss_dep() to utils Daniel Scally
2021-01-18 7:24 ` Laurent Pinchart
2021-01-18 8:31 ` Daniel Scally
2021-01-18 12:29 ` Andy Shevchenko
2021-01-18 12:35 ` Daniel Scally
2021-01-18 12:28 ` Andy Shevchenko
2021-01-18 16:06 ` Rafael J. Wysocki
2021-01-18 16:42 ` Andy Shevchenko
2021-01-18 0:34 ` [PATCH v2 2/7] acpi: utils: Add function to fetch dependent acpi_devices Daniel Scally
2021-01-18 7:34 ` Laurent Pinchart [this message]
2021-01-18 8:37 ` Daniel Scally
2021-01-18 12:33 ` Andy Shevchenko
2021-01-18 13:37 ` Daniel Scally
2021-01-18 16:14 ` Rafael J. Wysocki
2021-01-18 20:51 ` Daniel Scally
2021-01-19 13:15 ` Rafael J. Wysocki
2021-01-19 13:28 ` Daniel Scally
2021-01-21 9:47 ` Daniel Scally
2021-01-21 11:58 ` Rafael J. Wysocki
2021-01-21 12:04 ` Daniel Scally
2021-01-21 14:39 ` Rafael J. Wysocki
2021-01-21 16:34 ` Daniel Scally
2021-01-21 18:08 ` Rafael J. Wysocki
2021-01-21 21:06 ` Daniel Scally
2021-02-02 9:58 ` Daniel Scally
2021-02-02 11:27 ` Andy Shevchenko
2021-02-02 14:02 ` Rafael J. Wysocki
2021-01-18 0:34 ` [PATCH v2 3/7] i2c: i2c-core-base: Use format macro in i2c_dev_set_name() Daniel Scally
2021-01-18 7:28 ` Laurent Pinchart
2021-01-18 12:41 ` Andy Shevchenko
2021-01-18 9:41 ` Sakari Ailus
2021-01-18 9:42 ` Sakari Ailus
2021-01-18 9:48 ` Wolfram Sang
2021-01-18 12:39 ` Andy Shevchenko
2021-01-18 0:34 ` [PATCH v2 4/7] i2c: i2c-core-acpi: Add i2c_acpi_dev_name() Daniel Scally
2021-01-18 9:18 ` Laurent Pinchart
2021-01-18 13:41 ` Andy Shevchenko
2021-01-19 13:19 ` Rafael J. Wysocki
2021-01-28 9:00 ` Wolfram Sang
2021-01-28 9:15 ` Daniel Scally
2021-01-28 9:17 ` Wolfram Sang
2021-01-28 9:22 ` Daniel Scally
2021-01-18 13:39 ` Andy Shevchenko
2021-01-18 18:43 ` Joe Perches
2021-01-18 18:56 ` Andy Shevchenko
2021-01-18 19:00 ` Joe Perches
2021-01-18 19:01 ` Andy Shevchenko
2021-01-18 0:34 ` [PATCH v2 5/7] gpio: gpiolib-acpi: Export acpi_get_gpiod() Daniel Scally
2021-01-18 7:37 ` Laurent Pinchart
2021-01-18 13:45 ` Andy Shevchenko
2021-01-18 13:46 ` Andy Shevchenko
2021-01-18 21:32 ` Daniel Scally
2021-01-18 0:34 ` [PATCH v2 6/7] platform: x86: Add intel_skl_int3472 driver Daniel Scally
2021-01-18 9:15 ` Laurent Pinchart
2021-01-18 14:46 ` Andy Shevchenko
2021-01-18 21:19 ` Daniel Scally
2021-01-19 0:11 ` Daniel Scally
2021-01-19 6:21 ` Laurent Pinchart
2021-01-19 9:35 ` Andy Shevchenko
2021-01-19 16:49 ` Laurent Pinchart
2021-01-19 9:33 ` Andy Shevchenko
2021-01-19 9:34 ` Daniel Scally
2021-01-19 16:36 ` Laurent Pinchart
2021-01-19 17:43 ` Andy Shevchenko
2021-01-20 4:18 ` Laurent Pinchart
2021-01-20 11:44 ` Andy Shevchenko
2021-01-21 21:08 ` Daniel Scally
2021-01-19 9:24 ` Andy Shevchenko
2021-01-19 10:40 ` Daniel Scally
2021-01-19 11:08 ` Andy Shevchenko
2021-01-19 16:48 ` Laurent Pinchart
2021-01-19 17:51 ` Andy Shevchenko
2021-01-20 4:21 ` Laurent Pinchart
2021-01-20 12:57 ` Andy Shevchenko
2021-01-21 0:18 ` Daniel Scally
2021-02-07 11:00 ` Daniel Scally
2021-02-07 11:56 ` Andy Shevchenko
2021-01-18 20:46 ` Daniel Scally
2021-01-19 6:19 ` Laurent Pinchart
2021-01-19 8:43 ` Daniel Scally
2021-01-19 16:33 ` Laurent Pinchart
2021-01-18 11:12 ` Barnabás Pőcze
2021-01-18 13:51 ` andriy.shevchenko
2021-01-18 14:51 ` Barnabás Pőcze
2021-01-18 15:23 ` andriy.shevchenko
2021-01-18 15:32 ` Hans de Goede
2021-01-18 15:48 ` andriy.shevchenko
2021-01-18 16:00 ` Daniel Scally
2021-01-18 16:03 ` Hans de Goede
2021-01-18 17:05 ` Laurent Pinchart
2021-01-19 10:56 ` Kieran Bingham
2021-01-19 11:11 ` Andy Shevchenko
2021-01-19 11:12 ` Daniel Scally
2021-01-18 0:34 ` [PATCH v2 7/7] mfd: Remove tps68470 MFD driver Daniel Scally
2021-01-18 7:42 ` Laurent Pinchart
2021-01-18 13:53 ` Andy Shevchenko
2021-01-18 20:07 ` Joe Perches
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