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* hte: Uninitialized variable in hte_ts_get()Dan Carpenter2022-05-201-1/+1
| | | | | | | | | The "free_name" variable is sometimes used without being initialized. Fixes: 31ab09b42188 ("drivers: Add hardware timestamp engine (HTE) subsystem") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Acked-by: Dipen Patel <dipenp@nvidia.com> Signed-off-by: Thierry Reding <treding@nvidia.com>
* hte: Fix off by one in hte_push_ts_ns()Dan Carpenter2022-05-101-1/+1
| | | | | | | | | | | | The &chip->gdev->ei[] array has chip->nlines elements so this > comparison needs to be >= to prevent an out of bounds access. The gdev->ei[] array is allocated in hte_register_chip(). Fixes: 31ab09b42188 ("drivers: Add hardware timestamp engine (HTE) subsystem") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Reviewed-by: Dipen Patel <dipenp@nvidia.com> Acked-by: Dipen Patel <dipenp@nvidia.com> Signed-off-by: Thierry Reding <treding@nvidia.com>
* hte: Fix possible use-after-free in tegra_hte_test_remove()Yang Yingliang2022-05-101-1/+1
| | | | | | | | | | | | | | | del_timer() does not wait until the timer handler finishing. This means that the timer handler may still be running after the driver's remove function has finished, which would result in a use-after-free. Fix it by calling del_timer_sync(), which makes sure the timer handler has finished. Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> Reviewed-by: Dipen Patel <dipenp@nvidia.com> Acked-by: Dipen Patel <dipenp@nvidia.com> Signed-off-by: Thierry Reding <treding@nvidia.com>
* hte: Remove unused including <linux/version.h>Jiapeng Chong2022-05-101-1/+0
| | | | | | | | | | | | Eliminate the follow versioncheck warning: ./drivers/hte/hte-tegra194-test.c: 8 linux/version.h not needed. Reported-by: Abaci Robot <abaci@linux.alibaba.com> Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com> Reviewed-by: Dipen Patel <dipenp@nvidia.com> Acked-by: Dipen Patel <dipenp@nvidia.com> Signed-off-by: Thierry Reding <treding@nvidia.com>
* hte: Add Tegra HTE test driverDipen Patel2022-05-043-1/+247
| | | | | | | | | The test driver uses IRQ and GPIO lines to timestamp using HTE subsystem. The patch also adds compilation support in Kconfig and Makefile. Signed-off-by: Dipen Patel <dipenp@nvidia.com> Signed-off-by: Thierry Reding <treding@nvidia.com>
* hte: Add Tegra194 HTE kernel providerDipen Patel2022-05-043-0/+743
| | | | | | | | | | | | | | | | | Tegra194 device has multiple HTE instances also known as GTE (Generic Hardware Timestamping Engine) which can timestamp subset of SoC lines and signals. This provider driver focuses on IRQ and GPIO lines and exposes timestamping ability on those lines to the consumers through HTE subsystem. Also, with this patch, added: - documentation about this provider and its capabilities at Documentation/hte. - Compilation support in Makefile and Kconfig Signed-off-by: Dipen Patel <dipenp@nvidia.com> Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Thierry Reding <treding@nvidia.com>
* drivers: Add hardware timestamp engine (HTE) subsystemDipen Patel2022-05-043-0/+963
Some devices can timestamp system lines/signals/Buses in real-time using the hardware counter or other hardware means which can give finer granularity and help avoid jitter introduced by software timestamping. To utilize such functionality, this patchset creates HTE subsystem where devices can register themselves as providers so that the consumers devices can request specific line from the providers. The patch also adds compilation support in Makefile and menu options in Kconfig. The provider does following: - Registers chip with the framework. - Provides translation hook to convert logical line id. - Provides enable/disable, request/release callbacks. - Pushes timestamp data to HTE subsystem. The consumer does following: - Initializes line attribute. - Gets HTE timestamp descriptor. - Requests timestamp functionality. - Puts HTE timestamp descriptor. Signed-off-by: Dipen Patel <dipenp@nvidia.com> Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Thierry Reding <treding@nvidia.com>