forked from mirrors/linux
7829ee7849
Do not use _test_bit() macro for testing bit. The proper macro for this
is one without underline.
_test_bit() is what test_bit() was prior to const-optimization. It
directly calls arch_test_bit(), i.e. the arch-specific implementation
(or the generic one). It's strictly _internal_ and shouldn't be used
anywhere outside the actual test_bit() macro.
test_bit() is a wrapper which checks whether the bitmap and the bit
number are compile-time constants and if so, it calls the optimized
function which evaluates this call to a compile-time constant as well.
If either of them is not a compile-time constant, it just calls _test_bit().
test_bit() is the actual function to use anywhere in the kernel.
IOW, calling _test_bit() avoids potential compile-time optimizations.
The sensors is not a compile-time constant, thus most probably there
are no object code changes before and after the patch.
But anyway, we shouldn't call internal wrappers instead of
the actual API.
Fixes: 4da71a77fc ("ice: read internal temperature sensor")
Acked-by: Ivan Vecera <ivecera@redhat.com>
Reviewed-by: Alexander Lobakin <aleksander.lobakin@intel.com>
Signed-off-by: Petr Oros <poros@redhat.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Tested-by: Pucha Himasekhar Reddy <himasekharx.reddy.pucha@intel.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Link: https://patch.msgid.link/20240702171459.2606611-5-anthony.l.nguyen@intel.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
126 lines
2.7 KiB
C
126 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (C) 2023, Intel Corporation. */
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#include "ice.h"
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#include "ice_hwmon.h"
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#include "ice_adminq_cmd.h"
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#include <linux/hwmon.h>
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#define TEMP_FROM_REG(reg) ((reg) * 1000)
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static const struct hwmon_channel_info *ice_hwmon_info[] = {
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HWMON_CHANNEL_INFO(temp,
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HWMON_T_INPUT | HWMON_T_MAX |
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HWMON_T_CRIT | HWMON_T_EMERGENCY),
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NULL
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};
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static int ice_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
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u32 attr, int channel, long *val)
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{
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struct ice_aqc_get_sensor_reading_resp resp;
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struct ice_pf *pf = dev_get_drvdata(dev);
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int ret;
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if (type != hwmon_temp)
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return -EOPNOTSUPP;
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ret = ice_aq_get_sensor_reading(&pf->hw, &resp);
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if (ret) {
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dev_warn_ratelimited(dev,
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"%s HW read failure (%d)\n",
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__func__,
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ret);
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return ret;
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}
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switch (attr) {
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case hwmon_temp_input:
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*val = TEMP_FROM_REG(resp.data.s0f0.temp);
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break;
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case hwmon_temp_max:
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*val = TEMP_FROM_REG(resp.data.s0f0.temp_warning_threshold);
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break;
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case hwmon_temp_crit:
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*val = TEMP_FROM_REG(resp.data.s0f0.temp_critical_threshold);
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break;
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case hwmon_temp_emergency:
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*val = TEMP_FROM_REG(resp.data.s0f0.temp_fatal_threshold);
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break;
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default:
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dev_dbg(dev, "%s unsupported attribute (%d)\n",
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__func__, attr);
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return -EOPNOTSUPP;
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}
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return 0;
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}
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static umode_t ice_hwmon_is_visible(const void *data,
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enum hwmon_sensor_types type, u32 attr,
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int channel)
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{
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if (type != hwmon_temp)
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return 0;
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switch (attr) {
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case hwmon_temp_input:
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case hwmon_temp_crit:
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case hwmon_temp_max:
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case hwmon_temp_emergency:
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return 0444;
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}
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return 0;
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}
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static const struct hwmon_ops ice_hwmon_ops = {
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.is_visible = ice_hwmon_is_visible,
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.read = ice_hwmon_read
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};
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static const struct hwmon_chip_info ice_chip_info = {
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.ops = &ice_hwmon_ops,
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.info = ice_hwmon_info
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};
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static bool ice_is_internal_reading_supported(struct ice_pf *pf)
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{
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/* Only the first PF will report temperature for a chip.
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* Note that internal temp reading is not supported
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* for older FW (< v4.30).
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*/
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if (pf->hw.pf_id)
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return false;
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unsigned long sensors = pf->hw.dev_caps.supported_sensors;
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return test_bit(ICE_SENSOR_SUPPORT_E810_INT_TEMP_BIT, &sensors);
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};
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void ice_hwmon_init(struct ice_pf *pf)
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{
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struct device *dev = ice_pf_to_dev(pf);
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struct device *hdev;
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if (!ice_is_internal_reading_supported(pf))
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return;
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hdev = hwmon_device_register_with_info(dev, "ice", pf, &ice_chip_info,
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NULL);
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if (IS_ERR(hdev)) {
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dev_warn(dev,
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"hwmon_device_register_with_info returns error (%ld)",
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PTR_ERR(hdev));
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return;
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}
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pf->hwmon_dev = hdev;
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}
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void ice_hwmon_exit(struct ice_pf *pf)
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{
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if (!pf->hwmon_dev)
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return;
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hwmon_device_unregister(pf->hwmon_dev);
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}
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