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![Uwe Kleine-König](/assets/img/avatar_default.png)
According to the gcc manual functions "whose return value is not affected by changes to the observable state of the program and that have no observable effects on such state other than to return a value may lend themselves to optimizations such as common subexpression elimination. Declaring such functions with the 'const' attribute allows GCC to avoid emitting some calls in repeated invocations of the function with the same argument values." counter_priv() is such a function and so can be marked with the const function attribute. The effect for an arm allyesconfig build according to bloat-o-meter (on top of v6.5-rc2) is: add/remove: 0/1 grow/shrink: 2/14 up/down: 524/-1064 (-540) Function old new delta rz_mtu3_count_enable_write 632 1152 +520 stm32_count_enable_write 372 376 +4 ti_eqep_action_read 456 452 -4 stm32_lptim_cnt_action_write 400 392 -8 stm32_lptim_cnt_action_read 300 288 -12 rz_mtu3_count_write 296 284 -12 rz_mtu3_count_read 304 292 -12 rz_mtu3_count_function_read 212 200 -12 rz_mtu3_count_direction_read 268 256 -12 rz_mtu3_action_read 628 616 -12 rz_mtu3_count_function_write 328 312 -16 ecap_cnt_suspend 364 340 -24 ecap_cnt_resume 300 276 -24 rz_mtu3_count_ceiling_write 596 560 -36 rz_mtu3_count_enable_read 332 288 -44 rz_mtu3_count_ceiling_read 384 340 -44 rz_mtu3_initialize_counter 792 - -792 Total: Before=60715, After=60175, chg -0.89% Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Link: https://lore.kernel.org/r/20230718162015.3940148-1-u.kleine-koenig@pengutronix.de/ Signed-off-by: William Breathitt Gray <william.gray@linaro.org>
632 lines
21 KiB
C
632 lines
21 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Counter interface
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* Copyright (C) 2018 William Breathitt Gray
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*/
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#ifndef _COUNTER_H_
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#define _COUNTER_H_
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#include <linux/cdev.h>
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/kfifo.h>
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#include <linux/mutex.h>
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#include <linux/spinlock_types.h>
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#include <linux/types.h>
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#include <linux/wait.h>
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#include <uapi/linux/counter.h>
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struct counter_device;
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struct counter_count;
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struct counter_synapse;
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struct counter_signal;
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enum counter_comp_type {
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COUNTER_COMP_U8,
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COUNTER_COMP_U64,
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COUNTER_COMP_BOOL,
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COUNTER_COMP_SIGNAL_LEVEL,
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COUNTER_COMP_FUNCTION,
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COUNTER_COMP_SYNAPSE_ACTION,
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COUNTER_COMP_ENUM,
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COUNTER_COMP_COUNT_DIRECTION,
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COUNTER_COMP_COUNT_MODE,
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COUNTER_COMP_SIGNAL_POLARITY,
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COUNTER_COMP_ARRAY,
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};
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/**
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* struct counter_comp - Counter component node
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* @type: Counter component data type
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* @name: device-specific component name
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* @priv: component-relevant data
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* @action_read: Synapse action mode read callback. The read value of the
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* respective Synapse action mode should be passed back via
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* the action parameter.
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* @device_u8_read: Device u8 component read callback. The read value of the
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* respective Device u8 component should be passed back via
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* the val parameter.
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* @count_u8_read: Count u8 component read callback. The read value of the
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* respective Count u8 component should be passed back via
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* the val parameter.
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* @signal_u8_read: Signal u8 component read callback. The read value of the
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* respective Signal u8 component should be passed back via
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* the val parameter.
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* @device_u32_read: Device u32 component read callback. The read value of
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* the respective Device u32 component should be passed
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* back via the val parameter.
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* @count_u32_read: Count u32 component read callback. The read value of the
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* respective Count u32 component should be passed back via
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* the val parameter.
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* @signal_u32_read: Signal u32 component read callback. The read value of
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* the respective Signal u32 component should be passed
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* back via the val parameter.
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* @device_u64_read: Device u64 component read callback. The read value of
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* the respective Device u64 component should be passed
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* back via the val parameter.
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* @count_u64_read: Count u64 component read callback. The read value of the
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* respective Count u64 component should be passed back via
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* the val parameter.
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* @signal_u64_read: Signal u64 component read callback. The read value of
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* the respective Signal u64 component should be passed
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* back via the val parameter.
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* @signal_array_u32_read: Signal u32 array component read callback. The
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* index of the respective Count u32 array
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* component element is passed via the idx
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* parameter. The read value of the respective
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* Count u32 array component element should be
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* passed back via the val parameter.
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* @device_array_u64_read: Device u64 array component read callback. The
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* index of the respective Device u64 array
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* component element is passed via the idx
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* parameter. The read value of the respective
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* Device u64 array component element should be
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* passed back via the val parameter.
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* @count_array_u64_read: Count u64 array component read callback. The
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* index of the respective Count u64 array
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* component element is passed via the idx
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* parameter. The read value of the respective
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* Count u64 array component element should be
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* passed back via the val parameter.
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* @signal_array_u64_read: Signal u64 array component read callback. The
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* index of the respective Count u64 array
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* component element is passed via the idx
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* parameter. The read value of the respective
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* Count u64 array component element should be
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* passed back via the val parameter.
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* @action_write: Synapse action mode write callback. The write value of
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* the respective Synapse action mode is passed via the
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* action parameter.
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* @device_u8_write: Device u8 component write callback. The write value of
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* the respective Device u8 component is passed via the val
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* parameter.
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* @count_u8_write: Count u8 component write callback. The write value of
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* the respective Count u8 component is passed via the val
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* parameter.
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* @signal_u8_write: Signal u8 component write callback. The write value of
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* the respective Signal u8 component is passed via the val
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* parameter.
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* @device_u32_write: Device u32 component write callback. The write value of
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* the respective Device u32 component is passed via the
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* val parameter.
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* @count_u32_write: Count u32 component write callback. The write value of
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* the respective Count u32 component is passed via the val
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* parameter.
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* @signal_u32_write: Signal u32 component write callback. The write value of
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* the respective Signal u32 component is passed via the
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* val parameter.
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* @device_u64_write: Device u64 component write callback. The write value of
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* the respective Device u64 component is passed via the
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* val parameter.
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* @count_u64_write: Count u64 component write callback. The write value of
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* the respective Count u64 component is passed via the val
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* parameter.
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* @signal_u64_write: Signal u64 component write callback. The write value of
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* the respective Signal u64 component is passed via the
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* val parameter.
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* @signal_array_u32_write: Signal u32 array component write callback. The
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* index of the respective Signal u32 array
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* component element is passed via the idx
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* parameter. The write value of the respective
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* Signal u32 array component element is passed via
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* the val parameter.
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* @device_array_u64_write: Device u64 array component write callback. The
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* index of the respective Device u64 array
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* component element is passed via the idx
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* parameter. The write value of the respective
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* Device u64 array component element is passed via
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* the val parameter.
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* @count_array_u64_write: Count u64 array component write callback. The
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* index of the respective Count u64 array
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* component element is passed via the idx
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* parameter. The write value of the respective
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* Count u64 array component element is passed via
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* the val parameter.
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* @signal_array_u64_write: Signal u64 array component write callback. The
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* index of the respective Signal u64 array
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* component element is passed via the idx
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* parameter. The write value of the respective
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* Signal u64 array component element is passed via
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* the val parameter.
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*/
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struct counter_comp {
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enum counter_comp_type type;
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const char *name;
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void *priv;
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union {
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int (*action_read)(struct counter_device *counter,
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struct counter_count *count,
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struct counter_synapse *synapse,
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enum counter_synapse_action *action);
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int (*device_u8_read)(struct counter_device *counter, u8 *val);
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int (*count_u8_read)(struct counter_device *counter,
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struct counter_count *count, u8 *val);
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int (*signal_u8_read)(struct counter_device *counter,
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struct counter_signal *signal, u8 *val);
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int (*device_u32_read)(struct counter_device *counter,
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u32 *val);
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int (*count_u32_read)(struct counter_device *counter,
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struct counter_count *count, u32 *val);
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int (*signal_u32_read)(struct counter_device *counter,
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struct counter_signal *signal, u32 *val);
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int (*device_u64_read)(struct counter_device *counter,
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u64 *val);
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int (*count_u64_read)(struct counter_device *counter,
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struct counter_count *count, u64 *val);
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int (*signal_u64_read)(struct counter_device *counter,
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struct counter_signal *signal, u64 *val);
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int (*signal_array_u32_read)(struct counter_device *counter,
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struct counter_signal *signal,
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size_t idx, u32 *val);
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int (*device_array_u64_read)(struct counter_device *counter,
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size_t idx, u64 *val);
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int (*count_array_u64_read)(struct counter_device *counter,
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struct counter_count *count,
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size_t idx, u64 *val);
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int (*signal_array_u64_read)(struct counter_device *counter,
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struct counter_signal *signal,
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size_t idx, u64 *val);
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};
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union {
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int (*action_write)(struct counter_device *counter,
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struct counter_count *count,
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struct counter_synapse *synapse,
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enum counter_synapse_action action);
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int (*device_u8_write)(struct counter_device *counter, u8 val);
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int (*count_u8_write)(struct counter_device *counter,
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struct counter_count *count, u8 val);
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int (*signal_u8_write)(struct counter_device *counter,
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struct counter_signal *signal, u8 val);
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int (*device_u32_write)(struct counter_device *counter,
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u32 val);
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int (*count_u32_write)(struct counter_device *counter,
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struct counter_count *count, u32 val);
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int (*signal_u32_write)(struct counter_device *counter,
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struct counter_signal *signal, u32 val);
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int (*device_u64_write)(struct counter_device *counter,
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u64 val);
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int (*count_u64_write)(struct counter_device *counter,
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struct counter_count *count, u64 val);
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int (*signal_u64_write)(struct counter_device *counter,
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struct counter_signal *signal, u64 val);
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int (*signal_array_u32_write)(struct counter_device *counter,
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struct counter_signal *signal,
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size_t idx, u32 val);
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int (*device_array_u64_write)(struct counter_device *counter,
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size_t idx, u64 val);
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int (*count_array_u64_write)(struct counter_device *counter,
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struct counter_count *count,
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size_t idx, u64 val);
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int (*signal_array_u64_write)(struct counter_device *counter,
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struct counter_signal *signal,
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size_t idx, u64 val);
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};
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};
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/**
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* struct counter_signal - Counter Signal node
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* @id: unique ID used to identify the Signal
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* @name: device-specific Signal name
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* @ext: optional array of Signal extensions
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* @num_ext: number of Signal extensions specified in @ext
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*/
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struct counter_signal {
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int id;
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const char *name;
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struct counter_comp *ext;
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size_t num_ext;
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};
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/**
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* struct counter_synapse - Counter Synapse node
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* @actions_list: array of available action modes
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* @num_actions: number of action modes specified in @actions_list
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* @signal: pointer to the associated Signal
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*/
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struct counter_synapse {
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const enum counter_synapse_action *actions_list;
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size_t num_actions;
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struct counter_signal *signal;
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};
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/**
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* struct counter_count - Counter Count node
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* @id: unique ID used to identify the Count
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* @name: device-specific Count name
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* @functions_list: array of available function modes
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* @num_functions: number of function modes specified in @functions_list
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* @synapses: array of Synapses for initialization
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* @num_synapses: number of Synapses specified in @synapses
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* @ext: optional array of Count extensions
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* @num_ext: number of Count extensions specified in @ext
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*/
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struct counter_count {
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int id;
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const char *name;
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const enum counter_function *functions_list;
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size_t num_functions;
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struct counter_synapse *synapses;
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size_t num_synapses;
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struct counter_comp *ext;
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size_t num_ext;
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};
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/**
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* struct counter_event_node - Counter Event node
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* @l: list of current watching Counter events
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* @event: event that triggers
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* @channel: event channel
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* @comp_list: list of components to watch when event triggers
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*/
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struct counter_event_node {
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struct list_head l;
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u8 event;
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u8 channel;
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struct list_head comp_list;
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};
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/**
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* struct counter_ops - Callbacks from driver
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* @signal_read: optional read callback for Signals. The read level of
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* the respective Signal should be passed back via the
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* level parameter.
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* @count_read: read callback for Counts. The read value of the
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* respective Count should be passed back via the value
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* parameter.
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* @count_write: optional write callback for Counts. The write value for
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* the respective Count is passed in via the value
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* parameter.
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* @function_read: read callback the Count function modes. The read
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* function mode of the respective Count should be passed
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* back via the function parameter.
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* @function_write: optional write callback for Count function modes. The
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* function mode to write for the respective Count is
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* passed in via the function parameter.
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* @action_read: optional read callback the Synapse action modes. The
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* read action mode of the respective Synapse should be
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* passed back via the action parameter.
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* @action_write: optional write callback for Synapse action modes. The
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* action mode to write for the respective Synapse is
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* passed in via the action parameter.
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* @events_configure: optional write callback to configure events. The list of
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* struct counter_event_node may be accessed via the
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* events_list member of the counter parameter.
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* @watch_validate: optional callback to validate a watch. The Counter
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* component watch configuration is passed in via the watch
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* parameter. A return value of 0 indicates a valid Counter
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* component watch configuration.
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*/
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struct counter_ops {
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int (*signal_read)(struct counter_device *counter,
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struct counter_signal *signal,
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enum counter_signal_level *level);
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int (*count_read)(struct counter_device *counter,
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struct counter_count *count, u64 *value);
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int (*count_write)(struct counter_device *counter,
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struct counter_count *count, u64 value);
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int (*function_read)(struct counter_device *counter,
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struct counter_count *count,
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enum counter_function *function);
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int (*function_write)(struct counter_device *counter,
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struct counter_count *count,
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enum counter_function function);
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int (*action_read)(struct counter_device *counter,
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struct counter_count *count,
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struct counter_synapse *synapse,
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enum counter_synapse_action *action);
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int (*action_write)(struct counter_device *counter,
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struct counter_count *count,
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struct counter_synapse *synapse,
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enum counter_synapse_action action);
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int (*events_configure)(struct counter_device *counter);
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int (*watch_validate)(struct counter_device *counter,
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const struct counter_watch *watch);
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};
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/**
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* struct counter_device - Counter data structure
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* @name: name of the device
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* @parent: optional parent device providing the counters
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* @ops: callbacks from driver
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* @signals: array of Signals
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* @num_signals: number of Signals specified in @signals
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* @counts: array of Counts
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* @num_counts: number of Counts specified in @counts
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* @ext: optional array of Counter device extensions
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* @num_ext: number of Counter device extensions specified in @ext
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* @priv: optional private data supplied by driver
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* @dev: internal device structure
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* @chrdev: internal character device structure
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* @events_list: list of current watching Counter events
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* @events_list_lock: lock to protect Counter events list operations
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* @next_events_list: list of next watching Counter events
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* @n_events_list_lock: lock to protect Counter next events list operations
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* @events: queue of detected Counter events
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* @events_wait: wait queue to allow blocking reads of Counter events
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* @events_in_lock: lock to protect Counter events queue in operations
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* @events_out_lock: lock to protect Counter events queue out operations
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* @ops_exist_lock: lock to prevent use during removal
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*/
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struct counter_device {
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const char *name;
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struct device *parent;
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const struct counter_ops *ops;
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struct counter_signal *signals;
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size_t num_signals;
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struct counter_count *counts;
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size_t num_counts;
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struct counter_comp *ext;
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size_t num_ext;
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struct device dev;
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struct cdev chrdev;
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struct list_head events_list;
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spinlock_t events_list_lock;
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struct list_head next_events_list;
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struct mutex n_events_list_lock;
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DECLARE_KFIFO_PTR(events, struct counter_event);
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wait_queue_head_t events_wait;
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spinlock_t events_in_lock;
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struct mutex events_out_lock;
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struct mutex ops_exist_lock;
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};
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void *counter_priv(const struct counter_device *const counter) __attribute_const__;
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struct counter_device *counter_alloc(size_t sizeof_priv);
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void counter_put(struct counter_device *const counter);
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int counter_add(struct counter_device *const counter);
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void counter_unregister(struct counter_device *const counter);
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struct counter_device *devm_counter_alloc(struct device *dev,
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size_t sizeof_priv);
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int devm_counter_add(struct device *dev,
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struct counter_device *const counter);
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void counter_push_event(struct counter_device *const counter, const u8 event,
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const u8 channel);
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#define COUNTER_COMP_DEVICE_U8(_name, _read, _write) \
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{ \
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.type = COUNTER_COMP_U8, \
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.name = (_name), \
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.device_u8_read = (_read), \
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.device_u8_write = (_write), \
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}
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#define COUNTER_COMP_COUNT_U8(_name, _read, _write) \
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{ \
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.type = COUNTER_COMP_U8, \
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.name = (_name), \
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.count_u8_read = (_read), \
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.count_u8_write = (_write), \
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}
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#define COUNTER_COMP_SIGNAL_U8(_name, _read, _write) \
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{ \
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.type = COUNTER_COMP_U8, \
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.name = (_name), \
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.signal_u8_read = (_read), \
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.signal_u8_write = (_write), \
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}
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#define COUNTER_COMP_DEVICE_U64(_name, _read, _write) \
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{ \
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.type = COUNTER_COMP_U64, \
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.name = (_name), \
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.device_u64_read = (_read), \
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.device_u64_write = (_write), \
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}
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#define COUNTER_COMP_COUNT_U64(_name, _read, _write) \
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{ \
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.type = COUNTER_COMP_U64, \
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.name = (_name), \
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.count_u64_read = (_read), \
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.count_u64_write = (_write), \
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}
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#define COUNTER_COMP_SIGNAL_U64(_name, _read, _write) \
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{ \
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.type = COUNTER_COMP_U64, \
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.name = (_name), \
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.signal_u64_read = (_read), \
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.signal_u64_write = (_write), \
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}
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#define COUNTER_COMP_DEVICE_BOOL(_name, _read, _write) \
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{ \
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.type = COUNTER_COMP_BOOL, \
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.name = (_name), \
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.device_u8_read = (_read), \
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.device_u8_write = (_write), \
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}
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#define COUNTER_COMP_COUNT_BOOL(_name, _read, _write) \
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{ \
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.type = COUNTER_COMP_BOOL, \
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.name = (_name), \
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.count_u8_read = (_read), \
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.count_u8_write = (_write), \
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}
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#define COUNTER_COMP_SIGNAL_BOOL(_name, _read, _write) \
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{ \
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.type = COUNTER_COMP_BOOL, \
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.name = (_name), \
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.signal_u8_read = (_read), \
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.signal_u8_write = (_write), \
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}
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struct counter_available {
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union {
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const u32 *enums;
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const char *const *strs;
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};
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size_t num_items;
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};
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#define DEFINE_COUNTER_AVAILABLE(_name, _enums) \
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struct counter_available _name = { \
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.enums = (_enums), \
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.num_items = ARRAY_SIZE(_enums), \
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}
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#define DEFINE_COUNTER_ENUM(_name, _strs) \
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struct counter_available _name = { \
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.strs = (_strs), \
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.num_items = ARRAY_SIZE(_strs), \
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}
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#define COUNTER_COMP_DEVICE_ENUM(_name, _get, _set, _available) \
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{ \
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.type = COUNTER_COMP_ENUM, \
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.name = (_name), \
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.device_u32_read = (_get), \
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.device_u32_write = (_set), \
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.priv = &(_available), \
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}
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#define COUNTER_COMP_COUNT_ENUM(_name, _get, _set, _available) \
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{ \
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.type = COUNTER_COMP_ENUM, \
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.name = (_name), \
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.count_u32_read = (_get), \
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.count_u32_write = (_set), \
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.priv = &(_available), \
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}
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#define COUNTER_COMP_SIGNAL_ENUM(_name, _get, _set, _available) \
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{ \
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.type = COUNTER_COMP_ENUM, \
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.name = (_name), \
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.signal_u32_read = (_get), \
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.signal_u32_write = (_set), \
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.priv = &(_available), \
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}
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struct counter_array {
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enum counter_comp_type type;
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const struct counter_available *avail;
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union {
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size_t length;
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size_t idx;
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};
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};
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#define DEFINE_COUNTER_ARRAY_U64(_name, _length) \
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struct counter_array _name = { \
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.type = COUNTER_COMP_U64, \
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.length = (_length), \
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}
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|
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#define DEFINE_COUNTER_ARRAY_CAPTURE(_name, _length) \
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DEFINE_COUNTER_ARRAY_U64(_name, _length)
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|
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#define DEFINE_COUNTER_ARRAY_POLARITY(_name, _available, _length) \
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struct counter_array _name = { \
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.type = COUNTER_COMP_SIGNAL_POLARITY, \
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.avail = &(_available), \
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.length = (_length), \
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}
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|
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#define COUNTER_COMP_DEVICE_ARRAY_U64(_name, _read, _write, _array) \
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{ \
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.type = COUNTER_COMP_ARRAY, \
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.name = (_name), \
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.device_array_u64_read = (_read), \
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.device_array_u64_write = (_write), \
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.priv = &(_array), \
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}
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#define COUNTER_COMP_COUNT_ARRAY_U64(_name, _read, _write, _array) \
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{ \
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.type = COUNTER_COMP_ARRAY, \
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.name = (_name), \
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|
.count_array_u64_read = (_read), \
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|
.count_array_u64_write = (_write), \
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|
.priv = &(_array), \
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|
}
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#define COUNTER_COMP_SIGNAL_ARRAY_U64(_name, _read, _write, _array) \
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|
{ \
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|
.type = COUNTER_COMP_ARRAY, \
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|
.name = (_name), \
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|
.signal_array_u64_read = (_read), \
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|
.signal_array_u64_write = (_write), \
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|
.priv = &(_array), \
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|
}
|
|
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#define COUNTER_COMP_CAPTURE(_read, _write) \
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COUNTER_COMP_COUNT_U64("capture", _read, _write)
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|
|
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#define COUNTER_COMP_CEILING(_read, _write) \
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COUNTER_COMP_COUNT_U64("ceiling", _read, _write)
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|
|
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#define COUNTER_COMP_COUNT_MODE(_read, _write, _available) \
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|
{ \
|
|
.type = COUNTER_COMP_COUNT_MODE, \
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|
.name = "count_mode", \
|
|
.count_u32_read = (_read), \
|
|
.count_u32_write = (_write), \
|
|
.priv = &(_available), \
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|
}
|
|
|
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#define COUNTER_COMP_DIRECTION(_read) \
|
|
{ \
|
|
.type = COUNTER_COMP_COUNT_DIRECTION, \
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|
.name = "direction", \
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|
.count_u32_read = (_read), \
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|
}
|
|
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#define COUNTER_COMP_ENABLE(_read, _write) \
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COUNTER_COMP_COUNT_BOOL("enable", _read, _write)
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|
|
|
#define COUNTER_COMP_FLOOR(_read, _write) \
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|
COUNTER_COMP_COUNT_U64("floor", _read, _write)
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|
|
|
#define COUNTER_COMP_POLARITY(_read, _write, _available) \
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|
{ \
|
|
.type = COUNTER_COMP_SIGNAL_POLARITY, \
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|
.name = "polarity", \
|
|
.signal_u32_read = (_read), \
|
|
.signal_u32_write = (_write), \
|
|
.priv = &(_available), \
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|
}
|
|
|
|
#define COUNTER_COMP_PRESET(_read, _write) \
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|
COUNTER_COMP_COUNT_U64("preset", _read, _write)
|
|
|
|
#define COUNTER_COMP_PRESET_ENABLE(_read, _write) \
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|
COUNTER_COMP_COUNT_BOOL("preset_enable", _read, _write)
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|
|
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#define COUNTER_COMP_ARRAY_CAPTURE(_read, _write, _array) \
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|
COUNTER_COMP_COUNT_ARRAY_U64("capture", _read, _write, _array)
|
|
|
|
#define COUNTER_COMP_ARRAY_POLARITY(_read, _write, _array) \
|
|
{ \
|
|
.type = COUNTER_COMP_ARRAY, \
|
|
.name = "polarity", \
|
|
.signal_array_u32_read = (_read), \
|
|
.signal_array_u32_write = (_write), \
|
|
.priv = &(_array), \
|
|
}
|
|
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|
#endif /* _COUNTER_H_ */
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