mirror of
https://github.com/schoebel/mars
synced 2024-12-14 18:55:19 +00:00
689 lines
17 KiB
C
689 lines
17 KiB
C
// (c) 2010 Thomas Schoebel-Theuer / 1&1 Internet AG
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/string.h>
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//#define BRICK_DEBUGGING
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#define _STRATEGY
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#include "brick.h"
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#include "brick_mem.h"
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int _brick_msleep(int msecs, bool shorten)
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{
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unsigned long timeout;
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flush_signals(current); \
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if (msecs <= 0) {
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schedule();
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return 0;
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}
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timeout = msecs_to_jiffies(msecs) + 1;
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timeout = schedule_timeout_interruptible(timeout);
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if (!shorten) {
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while ((long)timeout > 0) {
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timeout = schedule_timeout_uninterruptible(timeout);
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}
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}
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return jiffies_to_msecs(timeout);
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}
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EXPORT_SYMBOL_GPL(_brick_msleep);
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#if 1
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/* The following _could_ go to kernel/kthread.c.
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* However, we need it only for a workaround here.
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* This has some conceptual shortcomings, so I will not
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* force that.
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*/
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#if 1 // remove this for migration to kernel/kthread.c
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struct kthread {
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int should_stop;
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#ifdef KTHREAD_WORKER_INIT
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void *data;
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#endif
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struct completion exited;
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};
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#define to_kthread(tsk) \
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container_of((tsk)->vfork_done, struct kthread, exited)
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#endif
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/**
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* kthread_stop_nowait - like kthread_stop(), but don't wait for termination.
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* @k: thread created by kthread_create().
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*
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* If threadfn() may call do_exit() itself, the caller must ensure
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* task_struct can't go away.
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*
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* Therefore, you must not call this twice (or after kthread_stop()), at least
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* if you don't get_task_struct() yourself.
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*/
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void kthread_stop_nowait(struct task_struct *k)
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{
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struct kthread *kthread;
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#if 0 // enable this after migration to kernel/kthread.c
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trace_sched_kthread_stop(k);
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#endif
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kthread = to_kthread(k);
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barrier(); /* it might have exited */
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if (k->vfork_done != NULL) {
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kthread->should_stop = 1;
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wake_up_process(k);
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}
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}
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EXPORT_SYMBOL_GPL(kthread_stop_nowait);
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#endif
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void brick_thread_stop_nowait(struct task_struct *k)
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{
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kthread_stop_nowait(k);
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}
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EXPORT_SYMBOL_GPL(brick_thread_stop_nowait);
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//////////////////////////////////////////////////////////////
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// number management
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static char *nr_table = NULL;
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int nr_max = 256;
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EXPORT_SYMBOL_GPL(nr_max);
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int get_nr(void)
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{
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char *new;
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int nr;
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if (unlikely(!nr_table)) {
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nr_table = brick_zmem_alloc(nr_max);
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if (!nr_table) {
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return 0;
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}
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}
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for (;;) {
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for (nr = 1; nr < nr_max; nr++) {
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if (!nr_table[nr]) {
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nr_table[nr] = 1;
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return nr;
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}
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}
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new = brick_zmem_alloc(nr_max << 1);
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if (!new)
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return 0;
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memcpy(new, nr_table, nr_max);
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brick_mem_free(nr_table);
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nr_table = new;
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nr_max <<= 1;
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}
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}
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EXPORT_SYMBOL_GPL(get_nr);
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void put_nr(int nr)
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{
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if (likely(nr_table && nr > 0 && nr < nr_max)) {
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nr_table[nr] = 0;
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}
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}
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EXPORT_SYMBOL_GPL(put_nr);
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//////////////////////////////////////////////////////////////
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// object stuff
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//////////////////////////////////////////////////////////////
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// brick stuff
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static int nr_brick_types = 0;
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static const struct generic_brick_type *brick_types[MAX_BRICK_TYPES] = {};
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int generic_register_brick_type(const struct generic_brick_type *new_type)
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{
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int i;
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int found = -1;
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BRICK_DBG("generic_register_brick_type() name=%s\n", new_type->type_name);
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for (i = 0; i < nr_brick_types; i++) {
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if (!brick_types[i]) {
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found = i;
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continue;
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}
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if (!strcmp(brick_types[i]->type_name, new_type->type_name)) {
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BRICK_DBG("bricktype %s is already registered.\n", new_type->type_name);
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return 0;
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}
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}
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if (found < 0) {
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if (nr_brick_types >= MAX_BRICK_TYPES) {
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BRICK_ERR("sorry, cannot register bricktype %s.\n", new_type->type_name);
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return -ENOMEM;
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}
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found = nr_brick_types++;
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}
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brick_types[found] = new_type;
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BRICK_DBG("generic_register_brick_type() done.\n");
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return 0;
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}
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EXPORT_SYMBOL_GPL(generic_register_brick_type);
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int generic_unregister_brick_type(const struct generic_brick_type *old_type)
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{
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BRICK_DBG("generic_unregister_brick_type()\n");
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return -1; // NYI
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}
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EXPORT_SYMBOL_GPL(generic_unregister_brick_type);
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int generic_brick_init_full(
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void *data,
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int size,
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const struct generic_brick_type *brick_type,
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const struct generic_input_type **input_types,
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const struct generic_output_type **output_types,
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const char **names)
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{
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struct generic_brick *brick = data;
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int status;
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int i;
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BRICK_DBG("brick_type = %s\n", brick_type->type_name);
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if (unlikely(!data)) {
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BRICK_ERR("invalid memory\n");
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return -EINVAL;
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}
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// call the generic constructors
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status = generic_brick_init(brick_type, brick, names ? *names++ : NULL);
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if (status)
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return status;
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data += brick_type->brick_size;
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size -= brick_type->brick_size;
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if (size < 0) {
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BRICK_ERR("Not enough MEMORY\n");
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return -ENOMEM;
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}
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if (!input_types) {
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BRICK_DBG("generic_brick_init_full: switch to default input_types\n");
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input_types = brick_type->default_input_types;
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names = brick_type->default_input_names;
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if (unlikely(!input_types)) {
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BRICK_ERR("no input types specified\n");
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return -EINVAL;
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}
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}
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BRICK_DBG("generic_brick_init_full: input_types\n");
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brick->inputs = data;
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data += sizeof(void*) * brick_type->max_inputs;
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size -= sizeof(void*) * brick_type->max_inputs;
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if (size < 0) {
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return -ENOMEM;
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}
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for (i = 0; i < brick_type->max_inputs; i++) {
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struct generic_input *input = data;
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const struct generic_input_type *type = *input_types++;
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if (!type || type->input_size <= 0) {
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return -EINVAL;
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}
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BRICK_DBG("generic_brick_init_full: calling generic_input_init()\n");
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status = generic_input_init(brick, i, type, input, (names && *names) ? *names++ : type->type_name);
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if (status < 0)
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return status;
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data += type->input_size;
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size -= type->input_size;
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if (size < 0)
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return -ENOMEM;
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}
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if (!output_types) {
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BRICK_DBG("generic_brick_init_full: switch to default output_types\n");
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output_types = brick_type->default_output_types;
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names = brick_type->default_output_names;
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if (unlikely(!output_types)) {
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BRICK_ERR("no output types specified\n");
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return -EINVAL;
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}
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}
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BRICK_DBG("generic_brick_init_full: output_types\n");
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brick->outputs = data;
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data += sizeof(void*) * brick_type->max_outputs;
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size -= sizeof(void*) * brick_type->max_outputs;
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if (size < 0)
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return -ENOMEM;
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for (i = 0; i < brick_type->max_outputs; i++) {
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struct generic_output *output = data;
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const struct generic_output_type *type = *output_types++;
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if (!type || type->output_size <= 0) {
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return -EINVAL;
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}
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BRICK_DBG("generic_brick_init_full: calling generic_output_init()\n");
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generic_output_init(brick, i, type, output, (names && *names) ? *names++ : type->type_name);
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if (status < 0)
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return status;
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data += type->output_size;
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size -= type->output_size;
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if (size < 0)
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return -ENOMEM;
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}
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// call the specific constructors
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BRICK_DBG("generic_brick_init_full: call specific contructors.\n");
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if (brick_type->brick_construct) {
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BRICK_DBG("generic_brick_init_full: calling brick_construct()\n");
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status = brick_type->brick_construct(brick);
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if (status < 0)
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return status;
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}
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for (i = 0; i < brick_type->max_inputs; i++) {
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struct generic_input *input = brick->inputs[i];
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if (!input)
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continue;
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if (!input->type) {
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BRICK_ERR("input has no associated type!\n");
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continue;
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}
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if (input->type->input_construct) {
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BRICK_DBG("generic_brick_init_full: calling input_construct()\n");
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status = input->type->input_construct(input);
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if (status < 0)
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return status;
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}
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}
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for (i = 0; i < brick_type->max_outputs; i++) {
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struct generic_output *output = brick->outputs[i];
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if (!output)
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continue;
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if (!output->type) {
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BRICK_ERR("output has no associated type!\n");
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continue;
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}
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if (output->type->output_construct) {
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BRICK_DBG("generic_brick_init_full: calling output_construct()\n");
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status = output->type->output_construct(output);
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if (status < 0)
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return status;
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}
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(generic_brick_init_full);
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int generic_brick_exit_full(struct generic_brick *brick)
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{
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int i;
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int status;
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// first, check all outputs
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for (i = 0; i < brick->type->max_outputs; i++) {
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struct generic_output *output = brick->outputs[i];
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if (!output)
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continue;
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if (!output->type) {
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BRICK_ERR("output has no associated type!\n");
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continue;
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}
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if (output->nr_connected) {
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BRICK_ERR("output is connected!\n");
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return -EPERM;
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}
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}
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// ok, test succeeded. start destruction...
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for (i = 0; i < brick->type->max_outputs; i++) {
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struct generic_output *output = brick->outputs[i];
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if (!output)
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continue;
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if (!output->type) {
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BRICK_ERR("output has no associated type!\n");
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continue;
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}
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if (output->type->output_destruct) {
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BRICK_DBG("generic_brick_exit_full: calling output_destruct()\n");
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status = output->type->output_destruct(output);
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if (status < 0)
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return status;
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_generic_output_exit(output);
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brick->outputs[i] = NULL; // others may remain leftover
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}
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}
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for (i = 0; i < brick->type->max_inputs; i++) {
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struct generic_input *input = brick->inputs[i];
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if (!input)
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continue;
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if (!input->type) {
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BRICK_ERR("input has no associated type!\n");
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continue;
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}
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if (input->type->input_destruct) {
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status = generic_disconnect(input);
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if (status < 0)
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return status;
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BRICK_DBG("generic_brick_exit_full: calling input_destruct()\n");
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status = input->type->input_destruct(input);
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if (status < 0)
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return status;
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brick->inputs[i] = NULL; // others may remain leftover
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generic_input_exit(input);
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}
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}
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if (brick->type->brick_destruct) {
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BRICK_DBG("generic_brick_exit_full: calling brick_destruct()\n");
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status = brick->type->brick_destruct(brick);
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if (status < 0)
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return status;
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}
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generic_brick_exit(brick);
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return 0;
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}
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EXPORT_SYMBOL_GPL(generic_brick_exit_full);
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////////////////////////////////////////////////////////////////////////
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// default implementations
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struct generic_object *generic_alloc(struct generic_brick *brick, struct generic_object_layout *object_layout, const struct generic_object_type *object_type)
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{
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struct generic_object *object;
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void *data;
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int object_size;
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int aspect_nr_max;
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int total_size;
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int hint_size;
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CHECK_PTR_NULL(object_type, err);
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CHECK_PTR(object_layout, err);
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object_size = object_type->default_size;
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aspect_nr_max = nr_max;
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total_size = object_size + aspect_nr_max * sizeof(void*);
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hint_size = object_layout->size_hint;
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if (likely(total_size <= hint_size)) {
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total_size = hint_size;
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} else { // usually happens only at the first time
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object_layout->size_hint = total_size;
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}
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data = brick_zmem_alloc(total_size);
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if (!data)
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goto err;
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atomic_inc(&object_layout->alloc_count);
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atomic_inc(&object_layout->total_alloc_count);
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object = data;
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object->object_type = object_type;
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object->object_layout = object_layout;
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object->aspects = data + object_size;
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object->aspect_nr_max = aspect_nr_max;
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object->free_offset = object_size + aspect_nr_max * sizeof(void*);
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object->max_offset = total_size;
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if (object_type->init_fn) {
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int status = object_type->init_fn(object);
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if (status < 0) {
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goto err_free;
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}
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}
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return object;
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err_free:
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brick_mem_free(data);
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err:
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return NULL;
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}
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EXPORT_SYMBOL_GPL(generic_alloc);
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void generic_free(struct generic_object *object)
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{
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const struct generic_object_type *object_type;
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struct generic_object_layout *object_layout;
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int i;
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CHECK_PTR(object, done);
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object_type = object->object_type;
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CHECK_PTR_NULL(object_type, done);
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object_layout = object->object_layout;
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CHECK_PTR(object_layout, done);
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atomic_dec(&object_layout->alloc_count);
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for (i = 0; i < object->aspect_nr_max; i++) {
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const struct generic_aspect_type *aspect_type;
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struct generic_aspect *aspect = object->aspects[i];
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if (!aspect)
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continue;
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object->aspects[i] = NULL;
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aspect_type = aspect->aspect_type;
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CHECK_PTR_NULL(aspect_type, done);
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if (aspect_type->exit_fn) {
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aspect_type->exit_fn(aspect);
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}
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if (aspect->shortcut)
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continue;
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brick_mem_free(aspect);
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atomic_dec(&object_layout->aspect_count);
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}
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if (object_type->exit_fn) {
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object_type->exit_fn(object);
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}
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brick_mem_free(object);
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done: ;
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}
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EXPORT_SYMBOL_GPL(generic_free);
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static
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struct generic_aspect *_new_aspect(struct generic_brick *brick, struct generic_object *obj)
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{
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struct generic_aspect *res = NULL;
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const struct generic_brick_type *brick_type = brick->type;
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const struct generic_object_type *object_type;
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const struct generic_aspect_type *aspect_type;
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int object_type_nr;
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int size;
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int rest;
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object_type = obj->object_type;
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CHECK_PTR_NULL(object_type, done);
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object_type_nr = object_type->object_type_nr;
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aspect_type = brick_type->aspect_types[object_type_nr];
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CHECK_PTR_NULL(aspect_type, done);
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size = aspect_type->aspect_size;
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rest = obj->max_offset - obj->free_offset;
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if (likely(size <= rest)) {
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/* Optimisation: re-use single memory allocation for both
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* the object and the new aspect.
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*/
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res = ((void*)obj) + obj->free_offset;
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obj->free_offset += size;
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res->shortcut = true;
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} else {
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struct generic_object_layout *object_layout = obj->object_layout;
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CHECK_PTR(object_layout, done);
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/* Maintain the size hint.
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* In future, only small aspects should be integrated into
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* the same memory block, and the hint should not grow larger
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* than PAGE_SIZE if it was smaller before.
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*/
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if (size < PAGE_SIZE / 2) {
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int max;
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max = obj->free_offset + size;
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/* This is racy, but races won't do any harm because
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* it is just a hint, not essential.
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*/
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if ((max < PAGE_SIZE || object_layout->size_hint > PAGE_SIZE) &&
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object_layout->size_hint < max)
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object_layout->size_hint = max;
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}
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res = brick_zmem_alloc(size);
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if (unlikely(!res)) {
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goto done;
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}
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atomic_inc(&object_layout->aspect_count);
|
|
atomic_inc(&object_layout->total_aspect_count);
|
|
}
|
|
res->object = obj;
|
|
res->aspect_type = aspect_type;
|
|
|
|
if (aspect_type->init_fn) {
|
|
int status = aspect_type->init_fn(res);
|
|
if (unlikely(status < 0)) {
|
|
BRICK_ERR("aspect init %p %p %p status = %d\n", brick, obj, res, status);
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
done:
|
|
return res;
|
|
}
|
|
|
|
struct generic_aspect *generic_get_aspect(struct generic_brick *brick, struct generic_object *obj)
|
|
{
|
|
struct generic_aspect *res = NULL;
|
|
int nr;
|
|
|
|
CHECK_PTR(brick, done);
|
|
CHECK_PTR(obj, done);
|
|
|
|
nr = brick->brick_index;
|
|
if (unlikely(nr <= 0 || nr >= obj->aspect_nr_max)) {
|
|
BRICK_ERR("bad nr = %d\n", nr);
|
|
goto done;
|
|
}
|
|
|
|
res = obj->aspects[nr];
|
|
if (!res) {
|
|
res = _new_aspect(brick, obj);
|
|
obj->aspects[nr] = res;
|
|
}
|
|
CHECK_PTR(res, done);
|
|
CHECK_PTR(res->object, done);
|
|
_CHECK(res->object == obj, done);
|
|
|
|
done:
|
|
return res;
|
|
}
|
|
EXPORT_SYMBOL_GPL(generic_get_aspect);
|
|
|
|
/////////////////////////////////////////////////////////////////
|
|
|
|
// helper stuff
|
|
|
|
void set_button(struct generic_switch *sw, bool val, bool force)
|
|
{
|
|
bool oldval = sw->button;
|
|
if ((sw->force_off |= force))
|
|
val = false;
|
|
if (val != oldval) {
|
|
sw->button = val;
|
|
//sw->trigger = true;
|
|
wake_up_interruptible(&sw->event);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(set_button);
|
|
|
|
void set_led_on(struct generic_switch *sw, bool val)
|
|
{
|
|
bool oldval = sw->led_on;
|
|
if (val != oldval) {
|
|
sw->led_on = val;
|
|
//sw->trigger = true;
|
|
wake_up_interruptible(&sw->event);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(set_led_on);
|
|
|
|
void set_led_off(struct generic_switch *sw, bool val)
|
|
{
|
|
bool oldval = sw->led_off;
|
|
if (val != oldval) {
|
|
sw->led_off = val;
|
|
//sw->trigger = true;
|
|
wake_up_interruptible(&sw->event);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(set_led_off);
|
|
|
|
void set_button_wait(struct generic_brick *brick, bool val, bool force, int timeout)
|
|
{
|
|
set_button(&brick->power, val, force);
|
|
if (brick->ops)
|
|
(void)brick->ops->brick_switch(brick);
|
|
if (val) {
|
|
wait_event_interruptible_timeout(brick->power.event, brick->power.led_on, timeout);
|
|
} else {
|
|
wait_event_interruptible_timeout(brick->power.event, brick->power.led_off, timeout);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(set_button_wait);
|
|
|
|
/////////////////////////////////////////////////////////////////
|
|
|
|
// meta stuff
|
|
|
|
const struct meta *find_meta(const struct meta *meta, const char *field_name)
|
|
{
|
|
const struct meta *tmp;
|
|
for (tmp = meta; tmp->field_name; tmp++) {
|
|
if (!strcmp(field_name, tmp->field_name)) {
|
|
return tmp;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(find_meta);
|
|
|
|
#if 0 // currently not needed, but this may change
|
|
void free_meta(void *data, const struct meta *meta)
|
|
{
|
|
for (; meta->field_name[0]; meta++) {
|
|
void *item;
|
|
switch (meta->field_type) {
|
|
case FIELD_SUB:
|
|
if (meta->field_ref) {
|
|
item = data + meta->field_offset;
|
|
free_meta(item, meta->field_ref);
|
|
}
|
|
break;
|
|
case FIELD_REF:
|
|
case FIELD_STRING:
|
|
item = data + meta->field_offset;
|
|
item = *(void**)item;
|
|
if (meta->field_ref)
|
|
free_meta(item, meta->field_ref);
|
|
brick_mem_free(item);
|
|
}
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(free_meta);
|
|
#endif
|
|
|
|
/////////////////////////////////////////////////////////////////////////
|
|
|
|
// module init stuff
|
|
|
|
int __init init_brick(void)
|
|
{
|
|
nr_table = brick_zmem_alloc(nr_max);
|
|
if (!nr_table) {
|
|
return -ENOMEM;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void __exit exit_brick(void)
|
|
{
|
|
if (nr_table) {
|
|
brick_mem_free(nr_table);
|
|
nr_table = NULL;
|
|
}
|
|
}
|
|
|
|
#ifndef CONFIG_MARS_HAVE_BIGMODULE
|
|
MODULE_DESCRIPTION("generic brick infrastructure");
|
|
MODULE_AUTHOR("Thomas Schoebel-Theuer <tst@1und1.de>");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_init(init_brick);
|
|
module_exit(exit_brick);
|
|
#endif
|