/* * ST Thermal Sensor Driver core routines * Author: Ajit Pal Singh * * Copyright (C) 2003-2014 STMicroelectronics (R&D) Limited * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * */ #include #include #include #include #include "st_thermal.h" /* The Thermal Framework expects millidegrees */ #define mcelsius(temp) ((temp) * 1000) /* * Function to allocate regfields which are common * between syscfg and memory mapped based sensors */ static int st_thermal_alloc_regfields(struct st_thermal_sensor *sensor) { struct device *dev = sensor->dev; struct regmap *regmap = sensor->regmap; const struct reg_field *reg_fields = sensor->cdata->reg_fields; sensor->dcorrect = devm_regmap_field_alloc(dev, regmap, reg_fields[DCORRECT]); sensor->overflow = devm_regmap_field_alloc(dev, regmap, reg_fields[OVERFLOW]); sensor->temp_data = devm_regmap_field_alloc(dev, regmap, reg_fields[DATA]); if (IS_ERR(sensor->dcorrect) || IS_ERR(sensor->overflow) || IS_ERR(sensor->temp_data)) { dev_err(dev, "failed to allocate common regfields\n"); return -EINVAL; } return sensor->ops->alloc_regfields(sensor); } static int st_thermal_sensor_on(struct st_thermal_sensor *sensor) { int ret; struct device *dev = sensor->dev; ret = clk_prepare_enable(sensor->clk); if (ret) { dev_err(dev, "failed to enable clk\n"); return ret; } ret = sensor->ops->power_ctrl(sensor, POWER_ON); if (ret) { dev_err(dev, "failed to power on sensor\n"); clk_disable_unprepare(sensor->clk); } return ret; } static int st_thermal_sensor_off(struct st_thermal_sensor *sensor) { int ret; ret = sensor->ops->power_ctrl(sensor, POWER_OFF); if (ret) return ret; clk_disable_unprepare(sensor->clk); return 0; } static int st_thermal_calibration(struct st_thermal_sensor *sensor) { int ret; unsigned int val; struct device *dev = sensor->dev; /* Check if sensor calibration data is already written */ ret = regmap_field_read(sensor->dcorrect, &val); if (ret) { dev_err(dev, "failed to read calibration data\n"); return ret; } if (!val) { /* * Sensor calibration value not set by bootloader, * default calibration data to be used */ ret = regmap_field_write(sensor->dcorrect, sensor->cdata->calibration_val); if (ret) dev_err(dev, "failed to set calibration data\n"); } return ret; } /* Callback to get temperature from HW*/ static int st_thermal_get_temp(struct thermal_zone_device *th, int *temperature) { struct st_thermal_sensor *sensor = th->devdata; struct device *dev = sensor->dev; unsigned int temp; unsigned int overflow; int ret; ret = regmap_field_read(sensor->overflow, &overflow); if (ret) return ret; if (overflow) return -EIO; ret = regmap_field_read(sensor->temp_data, &temp); if (ret) return ret; temp += sensor->cdata->temp_adjust_val; temp = mcelsius(temp); dev_dbg(dev, "temperature: %d\n", temp); *temperature = temp; return 0; } static int st_thermal_get_trip_type(struct thermal_zone_device *th, int trip, enum thermal_trip_type *type) { struct st_thermal_sensor *sensor = th->devdata; struct device *dev = sensor->dev; switch (trip) { case 0: *type = THERMAL_TRIP_CRITICAL; break; default: dev_err(dev, "invalid trip point\n"); return -EINVAL; } return 0; } static int st_thermal_get_trip_temp(struct thermal_zone_device *th, int trip, int *temp) { struct st_thermal_sensor *sensor = th->devdata; struct device *dev = sensor->dev; switch (trip) { case 0: *temp = mcelsius(sensor->cdata->crit_temp); break; default: dev_err(dev, "Invalid trip point\n"); return -EINVAL; } return 0; } static struct thermal_zone_device_ops st_tz_ops = { .get_temp = st_thermal_get_temp, .get_trip_type = st_thermal_get_trip_type, .get_trip_temp = st_thermal_get_trip_temp, }; int st_thermal_register(struct platform_device *pdev, const struct of_device_id *st_thermal_of_match) { struct st_thermal_sensor *sensor; struct device *dev = &pdev->dev; struct device_node *np = dev->of_node; const struct of_device_id *match; int polling_delay; int ret; if (!np) { dev_err(dev, "device tree node not found\n"); return -EINVAL; } sensor = devm_kzalloc(dev, sizeof(*sensor), GFP_KERNEL); if (!sensor) return -ENOMEM; sensor->dev = dev; match = of_match_device(st_thermal_of_match, dev); if (!(match && match->data)) return -EINVAL; sensor->cdata = match->data; if (!sensor->cdata->ops) return -EINVAL; sensor->ops = sensor->cdata->ops; ret = (sensor->ops->regmap_init)(sensor); if (ret) return ret; ret = st_thermal_alloc_regfields(sensor); if (ret) return ret; sensor->clk = devm_clk_get(dev, "thermal"); if (IS_ERR(sensor->clk)) { dev_err(dev, "failed to fetch clock\n"); return PTR_ERR(sensor->clk); } if (sensor->ops->register_enable_irq) { ret = sensor->ops->register_enable_irq(sensor); if (ret) return ret; } ret = st_thermal_sensor_on(sensor); if (ret) return ret; ret = st_thermal_calibration(sensor); if (ret) goto sensor_off; polling_delay = sensor->ops->register_enable_irq ? 0 : 1000; sensor->thermal_dev = thermal_zone_device_register(dev_name(dev), 1, 0, sensor, &st_tz_ops, NULL, 0, polling_delay); if (IS_ERR(sensor->thermal_dev)) { dev_err(dev, "failed to register thermal zone device\n"); ret = PTR_ERR(sensor->thermal_dev); goto sensor_off; } platform_set_drvdata(pdev, sensor); return 0; sensor_off: st_thermal_sensor_off(sensor); return ret; } EXPORT_SYMBOL_GPL(st_thermal_register); int st_thermal_unregister(struct platform_device *pdev) { struct st_thermal_sensor *sensor = platform_get_drvdata(pdev); st_thermal_sensor_off(sensor); thermal_zone_device_unregister(sensor->thermal_dev); return 0; } EXPORT_SYMBOL_GPL(st_thermal_unregister); #ifdef CONFIG_PM_SLEEP static int st_thermal_suspend(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); struct st_thermal_sensor *sensor = platform_get_drvdata(pdev); return st_thermal_sensor_off(sensor); } static int st_thermal_resume(struct device *dev) { int ret; struct platform_device *pdev = to_platform_device(dev); struct st_thermal_sensor *sensor = platform_get_drvdata(pdev); ret = st_thermal_sensor_on(sensor); if (ret) return ret; ret = st_thermal_calibration(sensor); if (ret) return ret; if (sensor->ops->enable_irq) { ret = sensor->ops->enable_irq(sensor); if (ret) return ret; } return 0; } #endif SIMPLE_DEV_PM_OPS(st_thermal_pm_ops, st_thermal_suspend, st_thermal_resume); EXPORT_SYMBOL_GPL(st_thermal_pm_ops); MODULE_AUTHOR("STMicroelectronics (R&D) Limited "); MODULE_DESCRIPTION("STMicroelectronics STi SoC Thermal Sensor Driver"); MODULE_LICENSE("GPL v2"); the object is going away at shutdown time, since both times happened when shutting down the X server. The call chains were different: - VT ioctl(KDSETMODE, KD_TEXT): intel_cleanup_plane_fb+0x5b/0xa0 [i915] drm_atomic_helper_cleanup_planes+0x6f/0x90 [drm_kms_helper] intel_atomic_commit_tail+0x749/0xfe0 [i915] intel_atomic_commit+0x3cb/0x4f0 [i915] drm_atomic_commit+0x4b/0x50 [drm] restore_fbdev_mode+0x14c/0x2a0 [drm_kms_helper] drm_fb_helper_restore_fbdev_mode_unlocked+0x34/0x80 [drm_kms_helper] drm_fb_helper_set_par+0x2d/0x60 [drm_kms_helper] intel_fbdev_set_par+0x18/0x70 [i915] fb_set_var+0x236/0x460 fbcon_blank+0x30f/0x350 do_unblank_screen+0xd2/0x1a0 vt_ioctl+0x507/0x12a0 tty_ioctl+0x355/0xc30 do_vfs_ioctl+0xa3/0x5e0 SyS_ioctl+0x79/0x90 entry_SYSCALL_64_fastpath+0x13/0x94 - i915 unpin_work workqueue: intel_unpin_work_fn+0x58/0x140 [i915] process_one_work+0x1f1/0x480 worker_thread+0x48/0x4d0 kthread+0x101/0x140 and this patch purely papers over the issue by adding a NULL pointer check and a WARN_ON_ONCE() to avoid the oops that would then generally make the machine unresponsive. Other callers of i915_gem_object_to_ggtt() seem to also check for the returned pointer being NULL and warn about it, so this clearly has happened before in other places. [ Reported it originally to the i915 developers on Jan 8, applying the ugly workaround on my own now after triggering the problem for the second time with no feedback. This is likely to be the same bug reported as https://bugs.freedesktop.org/show_bug.cgi?id=98829 https://bugs.freedesktop.org/show_bug.cgi?id=99134 which has a patch for the underlying problem, but it hasn't gotten to me, so I'm applying the workaround. ] Cc: Daniel Vetter <daniel.vetter@intel.com> Cc: Jani Nikula <jani.nikula@linux.intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Cc: Imre Deak <imre.deak@intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'tools/testing/selftests/powerpc/stringloops/Makefile')