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Thu, 10 Oct 2024 02:10:32 -0700 (PDT) From: Bartosz Golaszewski Subject: [PATCH v2 0/6] gpio: notify user-space about config changes in the kernel Date: Thu, 10 Oct 2024 11:10:21 +0200 Message-Id: <20241010-gpio-notify-in-kernel-events-v2-0-b560411f7c59@linaro.org> Precedence: bulk X-Mailing-List: linux-gpio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-B4-Tracking: v=1; b=H4sIAP6ZB2cC/4XNQQ6CMBCF4auQWTumrRjBFfcwLAhMYSKZkilpJ IS7W7mAy/8tvrdDJGWK8Cx2UEocOUgOdymgnzoZCXnIDc640tSuxHHhgBJW9huy4JtUaEZKJGt E8+iH2jp7v1EFmViUPH9O/tXmnjiuQbfzLdnfesLWmD9wsmiw6npXkx186amZWToN16AjtMdxf AGMItrgyQAAAA== To: Linus Walleij , Bartosz Golaszewski , Kent Gibson Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, Bartosz Golaszewski X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1883; i=bartosz.golaszewski@linaro.org; h=from:subject:message-id; bh=udk9y/O8V02u/vCjHKVVxLkTtQRErg2Z8TgeAW54YtE=; b=owEBbQKS/ZANAwAKARGnLqAUcddyAcsmYgBnB5oCANeial/2/ppQ8Kb2nEGg+TV5wnsxl4y7C qKlPpOUtSOJAjMEAAEKAB0WIQQWnetsC8PEYBPSx58Rpy6gFHHXcgUCZweaAgAKCRARpy6gFHHX cgmCEAC2P0vpQUdaQ4dvkd2DAbxRNH3qEx1gA14cd099PIziYBMX36S6nt5EGeAIVfeU+Z2Fl/i PJeYXtd4NDNBkOm2xe1muBzm2Yag6jZA4zpHB0P/7Tgnjv7I4rquuYtnlgJfJJ+6MarN3jqUuhG 5F2fUCmzUmLYTFYK3bRFxaGZyNR2cTQByvcre+q+JHkVOxk0vA+Y6aYs2NTqdud54TmdS8Mpkkh WkCwKwi2REng5PyDnnGqCnehXOiAYFzPrCIfpFeZQiLEue2IvmWoURiwi7CrQqMRNFyPI/IyLNq AIvrfI36z9ZaJPbpIPkF9N+2tAES+S2YXHjjlKhedzP9gyrhQJr2PvvWqWuBLL/34omusM2oDsP 0hf+CqMNeEznaNcu0pzsw7aI6G3jBFUW4wy91RzNTLlahxFYRaZInuOG7EEN861i4sDKLhfhlZW 6NOs8oj4fwA+j7UeJ6nq7Zbon+mT9hxEEHA5FjglhymYMNIjNdNvholFlEhQx6Lt5lPEff4Fovs sfiZUIcoAAhSH5NzwlPI/6EzzFl1UT/ou62NNRP7BssRq/3IpHGhOu5x/Y4cGDe5KzZYHKVBW2C i6n3aPJWdyV5HuN+M7zDj5EhJrVMKhhGMG9w5YMYdtt2uh7Q815nzOriMISOSSiOrs3EyXEMUZY UsVw446c26plpmA== X-Developer-Key: i=bartosz.golaszewski@linaro.org; a=openpgp; fpr=169DEB6C0BC3C46013D2C79F11A72EA01471D772 We currently only emit events on changed line config to user-space on changes made from user-space. Users have no way of getting notified about in-kernel changes. This series improves the situation and also contains a couple other related improvements. This is a reworked approach which gets and stores as much info (all of it actually, except for the pinctrl state) the moment the event occurrs but moves the actual queueing of the event on the kfifo to a dedicated high-priority, ordered workqueue. Signed-off-by: Bartosz Golaszewski --- Changes in v2: - put all line-info events emitting on a workqueue to allow queueing them from atomic context - switch the notifier type used for emitting info events to atomic - add a patch notifying user-space about drivers requesting their own descs - drop patches that were picked up - Link to v1: https://lore.kernel.org/r/20241004-gpio-notify-in-kernel-events-v1-0-8ac29e1df4fe@linaro.org --- Bartosz Golaszewski (6): gpiolib: notify user-space when a driver requests its own desc gpio: cdev: prepare gpio_desc_to_lineinfo() for being called from atomic gpiolib: add a per-gpio_device line state notification workqueue gpio: cdev: put emitting the line state events on a workqueue gpiolib: switch the line state notifier to atomic gpiolib: notify user-space about in-kernel line state changes drivers/gpio/gpiolib-cdev.c | 126 +++++++++++++++++++++++++++++++++----------- drivers/gpio/gpiolib.c | 79 +++++++++++++++++++++++---- drivers/gpio/gpiolib.h | 8 ++- 3 files changed, 171 insertions(+), 42 deletions(-) --- base-commit: b7adfb6076ff0c1ebbde56d1903daa3d07db92c5 change-id: 20240924-gpio-notify-in-kernel-events-07cd912153e8 Best regards,