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lib: Introduce priority array area manager

Browse Source 
This introduces a infrastructure for management of linear priority
areas. Priority order in an array matters, however order of items inside
a priority group does not matter.

As an initial implementation, L-sort algorithm is used. It is quite
trivial. More advanced algorithm called P-sort will be introduced as a
follow-up. The infrastructure is prepared for other algos.

Alongside this, a testing module is introduced as well.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Pirko 2017-02-03 10:29:06 +01:00 committed by David S. Miller
parent b862815c3e
commit 44091d29f2
7 changed files with 871 additions and 0 deletions
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8
MAINTAINERS
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@ -9382,6 +9382,14 @@ F: drivers/video/fbdev/sti*
F: drivers/video/console/sti*
F: drivers/video/logo/logo_parisc*
PARMAN
M: Jiri Pirko <jiri@mellanox.com>
L: netdev@vger.kernel.org
S: Supported
F: lib/parman.c
F: lib/test_parman.c
F: include/linux/parman.h
PC87360 HARDWARE MONITORING DRIVER
M: Jim Cromie <jim.cromie@gmail.com>
L: linux-hwmon@vger.kernel.org

76
include/linux/parman.h Normal file
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@ -0,0 +1,76 @@
/*
* include/linux/parman.h - Manager for linear priority array areas
* Copyright (c) 2017 Mellanox Technologies. All rights reserved.
* Copyright (c) 2017 Jiri Pirko <jiri@mellanox.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the names of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _PARMAN_H
#define _PARMAN_H
#include <linux/list.h>
enum parman_algo_type {
PARMAN_ALGO_TYPE_LSORT,
};
struct parman_item {
struct list_head list;
unsigned long index;
};
struct parman_prio {
struct list_head list;
struct list_head item_list;
unsigned long priority;
};
struct parman_ops {
unsigned long base_count;
unsigned long resize_step;
int (*resize)(void *priv, unsigned long new_count);
void (*move)(void *priv, unsigned long from_index,
unsigned long to_index, unsigned long count);
enum parman_algo_type algo;
};
struct parman;
struct parman *parman_create(const struct parman_ops *ops, void *priv);
void parman_destroy(struct parman *parman);
void parman_prio_init(struct parman *parman, struct parman_prio *prio,
unsigned long priority);
void parman_prio_fini(struct parman_prio *prio);
int parman_item_add(struct parman *parman, struct parman_prio *prio,
struct parman_item *item);
void parman_item_remove(struct parman *parman, struct parman_prio *prio,
struct parman_item *item);
#endif

3
lib/Kconfig
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@ -550,4 +550,7 @@ config STACKDEPOT
config SBITMAP
bool
config PARMAN
tristate "parman"
endmenu

10
lib/Kconfig.debug
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@ -1826,6 +1826,16 @@ config TEST_HASH
This is intended to help people writing architecture-specific
optimized versions. If unsure, say N.
config TEST_PARMAN
tristate "Perform selftest on priority array manager"
default n
depends on PARMAN
help
Enable this option to test priority array manager on boot
(or module load).
If unsure, say N.
endmenu # runtime tests
config PROVIDE_OHCI1394_DMA_INIT

3
lib/Makefile
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@ -56,6 +56,7 @@ obj-$(CONFIG_TEST_STATIC_KEYS) += test_static_key_base.o
obj-$(CONFIG_TEST_PRINTF) += test_printf.o
obj-$(CONFIG_TEST_BITMAP) += test_bitmap.o
obj-$(CONFIG_TEST_UUID) += test_uuid.o
obj-$(CONFIG_TEST_PARMAN) += test_parman.o
ifeq ($(CONFIG_DEBUG_KOBJECT),y)
CFLAGS_kobject.o += -DDEBUG
@ -230,3 +231,5 @@ obj-$(CONFIG_UBSAN) += ubsan.o
UBSAN_SANITIZE_ubsan.o := n
obj-$(CONFIG_SBITMAP) += sbitmap.o
obj-$(CONFIG_PARMAN) += parman.o

376
lib/parman.c Normal file
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@ -0,0 +1,376 @@
/*
* lib/parman.c - Manager for linear priority array areas
* Copyright (c) 2017 Mellanox Technologies. All rights reserved.
* Copyright (c) 2017 Jiri Pirko <jiri@mellanox.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the names of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/export.h>
#include <linux/list.h>
#include <linux/err.h>
#include <linux/parman.h>
struct parman_algo {
int (*item_add)(struct parman *parman, struct parman_prio *prio,
struct parman_item *item);
void (*item_remove)(struct parman *parman, struct parman_prio *prio,
struct parman_item *item);
};
struct parman {
const struct parman_ops *ops;
void *priv;
const struct parman_algo *algo;
unsigned long count;
unsigned long limit_count;
struct list_head prio_list;
};
static int parman_enlarge(struct parman *parman)
{
unsigned long new_count = parman->limit_count +
parman->ops->resize_step;
int err;
err = parman->ops->resize(parman->priv, new_count);
if (err)
return err;
parman->limit_count = new_count;
return 0;
}
static int parman_shrink(struct parman *parman)
{
unsigned long new_count = parman->limit_count -
parman->ops->resize_step;
int err;
if (new_count < parman->ops->base_count)
return 0;
err = parman->ops->resize(parman->priv, new_count);
if (err)
return err;
parman->limit_count = new_count;
return 0;
}
static bool parman_prio_used(struct parman_prio *prio)
{
return !list_empty(&prio->item_list);
}
static struct parman_item *parman_prio_first_item(struct parman_prio *prio)
{
return list_first_entry(&prio->item_list,
typeof(struct parman_item), list);
}
static unsigned long parman_prio_first_index(struct parman_prio *prio)
{
return parman_prio_first_item(prio)->index;
}
static struct parman_item *parman_prio_last_item(struct parman_prio *prio)
{
return list_last_entry(&prio->item_list,
typeof(struct parman_item), list);
}
static unsigned long parman_prio_last_index(struct parman_prio *prio)
{
return parman_prio_last_item(prio)->index;
}
static unsigned long parman_lsort_new_index_find(struct parman *parman,
struct parman_prio *prio)
{
list_for_each_entry_from_reverse(prio, &parman->prio_list, list) {
if (!parman_prio_used(prio))
continue;
return parman_prio_last_index(prio) + 1;
}
return 0;
}
static void __parman_prio_move(struct parman *parman, struct parman_prio *prio,
struct parman_item *item, unsigned long to_index,
unsigned long count)
{
parman->ops->move(parman->priv, item->index, to_index, count);
}
static void parman_prio_shift_down(struct parman *parman,
struct parman_prio *prio)
{
struct parman_item *item;
unsigned long to_index;
if (!parman_prio_used(prio))
return;
item = parman_prio_first_item(prio);
to_index = parman_prio_last_index(prio) + 1;
__parman_prio_move(parman, prio, item, to_index, 1);
list_move_tail(&item->list, &prio->item_list);
item->index = to_index;
}
static void parman_prio_shift_up(struct parman *parman,
struct parman_prio *prio)
{
struct parman_item *item;
unsigned long to_index;
if (!parman_prio_used(prio))
return;
item = parman_prio_last_item(prio);
to_index = parman_prio_first_index(prio) - 1;
__parman_prio_move(parman, prio, item, to_index, 1);
list_move(&item->list, &prio->item_list);
item->index = to_index;
}
static void parman_prio_item_remove(struct parman *parman,
struct parman_prio *prio,
struct parman_item *item)
{
struct parman_item *last_item;
unsigned long to_index;
last_item = parman_prio_last_item(prio);
if (last_item == item) {
list_del(&item->list);
return;
}
to_index = item->index;
__parman_prio_move(parman, prio, last_item, to_index, 1);
list_del(&last_item->list);
list_replace(&item->list, &last_item->list);
last_item->index = to_index;
}
static int parman_lsort_item_add(struct parman *parman,
struct parman_prio *prio,
struct parman_item *item)
{
struct parman_prio *prio2;
unsigned long new_index;
int err;
if (parman->count + 1 > parman->limit_count) {
err = parman_enlarge(parman);
if (err)
return err;
}
new_index = parman_lsort_new_index_find(parman, prio);
list_for_each_entry_reverse(prio2, &parman->prio_list, list) {
if (prio2 == prio)
break;
parman_prio_shift_down(parman, prio2);
}
item->index = new_index;
list_add_tail(&item->list, &prio->item_list);
parman->count++;
return 0;
}
static void parman_lsort_item_remove(struct parman *parman,
struct parman_prio *prio,
struct parman_item *item)
{
parman_prio_item_remove(parman, prio, item);
list_for_each_entry_continue(prio, &parman->prio_list, list)
parman_prio_shift_up(parman, prio);
parman->count--;
if (parman->limit_count - parman->count >= parman->ops->resize_step)
parman_shrink(parman);
}
static const struct parman_algo parman_lsort = {
.item_add = parman_lsort_item_add,
.item_remove = parman_lsort_item_remove,
};
static const struct parman_algo *parman_algos[] = {
&parman_lsort,
};
/**
* parman_create - creates a new parman instance
* @ops: caller-specific callbacks
* @priv: pointer to a private data passed to the ops
*
* Note: all locking must be provided by the caller.
*
* Each parman instance manages an array area with chunks of entries
* with the same priority. Consider following example:
*
* item 1 with prio 10
* item 2 with prio 10
* item 3 with prio 10
* item 4 with prio 20
* item 5 with prio 20
* item 6 with prio 30
* item 7 with prio 30
* item 8 with prio 30
*
* In this example, there are 3 priority chunks. The order of the priorities
* matters, however the order of items within a single priority chunk does not
* matter. So the same array could be ordered as follows:
*
* item 2 with prio 10
* item 3 with prio 10
* item 1 with prio 10
* item 5 with prio 20
* item 4 with prio 20
* item 7 with prio 30
* item 8 with prio 30
* item 6 with prio 30
*
* The goal of parman is to maintain the priority ordering. The caller
* provides @ops with callbacks parman uses to move the items
* and resize the array area.
*
* Returns a pointer to newly created parman instance in case of success,
* otherwise it returns NULL.
*/
struct parman *parman_create(const struct parman_ops *ops, void *priv)
{
struct parman *parman;
parman = kzalloc(sizeof(*parman), GFP_KERNEL);
if (!parman)
return NULL;
INIT_LIST_HEAD(&parman->prio_list);
parman->ops = ops;
parman->priv = priv;
parman->limit_count = ops->base_count;
parman->algo = parman_algos[ops->algo];
return parman;
}
EXPORT_SYMBOL(parman_create);
/**
* parman_destroy - destroys existing parman instance
* @parman: parman instance
*
* Note: all locking must be provided by the caller.
*/
void parman_destroy(struct parman *parman)
{
WARN_ON(!list_empty(&parman->prio_list));
kfree(parman);
}
EXPORT_SYMBOL(parman_destroy);
/**
* parman_prio_init - initializes a parman priority chunk
* @parman: parman instance
* @prio: parman prio structure to be initialized
* @prority: desired priority of the chunk
*
* Note: all locking must be provided by the caller.
*
* Before caller could add an item with certain priority, he has to
* initialize a priority chunk for it using this function.
*/
void parman_prio_init(struct parman *parman, struct parman_prio *prio,
unsigned long priority)
{
struct parman_prio *prio2;
struct list_head *pos;
INIT_LIST_HEAD(&prio->item_list);
prio->priority = priority;
/* Position inside the list according to priority */
list_for_each(pos, &parman->prio_list) {
prio2 = list_entry(pos, typeof(*prio2), list);
if (prio2->priority > prio->priority)
break;
}
list_add_tail(&prio->list, pos);
}
EXPORT_SYMBOL(parman_prio_init);
/**
* parman_prio_fini - finalizes use of parman priority chunk
* @prio: parman prio structure
*
* Note: all locking must be provided by the caller.
*/
void parman_prio_fini(struct parman_prio *prio)
{
WARN_ON(parman_prio_used(prio));
list_del(&prio->list);
}
EXPORT_SYMBOL(parman_prio_fini);
/**
* parman_item_add - adds a parman item under defined priority
* @parman: parman instance
* @prio: parman prio instance to add the item to
* @item: parman item instance
*
* Note: all locking must be provided by the caller.
*
* Adds item to a array managed by parman instance under the specified priority.
*
* Returns 0 in case of success, negative number to indicate an error.
*/
int parman_item_add(struct parman *parman, struct parman_prio *prio,
struct parman_item *item)
{
return parman->algo->item_add(parman, prio, item);
}
EXPORT_SYMBOL(parman_item_add);
/**
* parman_item_del - deletes parman item
* @parman: parman instance
* @prio: parman prio instance to delete the item from
* @item: parman item instance
*
* Note: all locking must be provided by the caller.
*/
void parman_item_remove(struct parman *parman, struct parman_prio *prio,
struct parman_item *item)
{
parman->algo->item_remove(parman, prio, item);
}
EXPORT_SYMBOL(parman_item_remove);
MODULE_LICENSE("Dual BSD/GPL");
MODULE_AUTHOR("Jiri Pirko <jiri@mellanox.com>");
MODULE_DESCRIPTION("Priority-based array manager");

395
lib/test_parman.c Normal file
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@ -0,0 +1,395 @@
/*
* lib/test_parman.c - Test module for parman
* Copyright (c) 2017 Mellanox Technologies. All rights reserved.
* Copyright (c) 2017 Jiri Pirko <jiri@mellanox.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the names of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/bitops.h>
#include <linux/err.h>
#include <linux/random.h>
#include <linux/parman.h>
#define TEST_PARMAN_PRIO_SHIFT 7 /* defines number of prios for testing */
#define TEST_PARMAN_PRIO_COUNT BIT(TEST_PARMAN_PRIO_SHIFT)
#define TEST_PARMAN_PRIO_MASK (TEST_PARMAN_PRIO_COUNT - 1)
#define TEST_PARMAN_ITEM_SHIFT 13 /* defines a total number
* of items for testing
*/
#define TEST_PARMAN_ITEM_COUNT BIT(TEST_PARMAN_ITEM_SHIFT)
#define TEST_PARMAN_ITEM_MASK (TEST_PARMAN_ITEM_COUNT - 1)
#define TEST_PARMAN_BASE_SHIFT 8
#define TEST_PARMAN_BASE_COUNT BIT(TEST_PARMAN_BASE_SHIFT)
#define TEST_PARMAN_RESIZE_STEP_SHIFT 7
#define TEST_PARMAN_RESIZE_STEP_COUNT BIT(TEST_PARMAN_RESIZE_STEP_SHIFT)
#define TEST_PARMAN_BULK_MAX_SHIFT (2 + TEST_PARMAN_RESIZE_STEP_SHIFT)
#define TEST_PARMAN_BULK_MAX_COUNT BIT(TEST_PARMAN_BULK_MAX_SHIFT)
#define TEST_PARMAN_BULK_MAX_MASK (TEST_PARMAN_BULK_MAX_COUNT - 1)
#define TEST_PARMAN_RUN_BUDGET (TEST_PARMAN_ITEM_COUNT * 256)
struct test_parman_prio {
struct parman_prio parman_prio;
unsigned long priority;
};
struct test_parman_item {
struct parman_item parman_item;
struct test_parman_prio *prio;
bool used;
};
struct test_parman {
struct parman *parman;
struct test_parman_item **prio_array;
unsigned long prio_array_limit;
struct test_parman_prio prios[TEST_PARMAN_PRIO_COUNT];
struct test_parman_item items[TEST_PARMAN_ITEM_COUNT];
struct rnd_state rnd;
unsigned long run_budget;
unsigned long bulk_budget;
bool bulk_noop;
unsigned int used_items;
};
#define ITEM_PTRS_SIZE(count) (sizeof(struct test_parman_item *) * (count))
static int test_parman_resize(void *priv, unsigned long new_count)
{
struct test_parman *test_parman = priv;
struct test_parman_item **prio_array;
unsigned long old_count;
prio_array = krealloc(test_parman->prio_array,
ITEM_PTRS_SIZE(new_count), GFP_KERNEL);
if (new_count == 0)
return 0;
if (!prio_array)
return -ENOMEM;
old_count = test_parman->prio_array_limit;
if (new_count > old_count)
memset(&prio_array[old_count], 0,
ITEM_PTRS_SIZE(new_count - old_count));
test_parman->prio_array = prio_array;
test_parman->prio_array_limit = new_count;
return 0;
}
static void test_parman_move(void *priv, unsigned long from_index,
unsigned long to_index, unsigned long count)
{
struct test_parman *test_parman = priv;
struct test_parman_item **prio_array = test_parman->prio_array;
memmove(&prio_array[to_index], &prio_array[from_index],
ITEM_PTRS_SIZE(count));
memset(&prio_array[from_index], 0, ITEM_PTRS_SIZE(count));
}
static const struct parman_ops test_parman_lsort_ops = {
.base_count = TEST_PARMAN_BASE_COUNT,
.resize_step = TEST_PARMAN_RESIZE_STEP_COUNT,
.resize = test_parman_resize,
.move = test_parman_move,
.algo = PARMAN_ALGO_TYPE_LSORT,
};
static void test_parman_rnd_init(struct test_parman *test_parman)
{
prandom_seed_state(&test_parman->rnd, 3141592653589793238ULL);
}
static u32 test_parman_rnd_get(struct test_parman *test_parman)
{
return prandom_u32_state(&test_parman->rnd);
}
static unsigned long test_parman_priority_gen(struct test_parman *test_parman)
{
unsigned long priority;
int i;
again:
priority = test_parman_rnd_get(test_parman);
if (priority == 0)
goto again;
for (i = 0; i < TEST_PARMAN_PRIO_COUNT; i++) {
struct test_parman_prio *prio = &test_parman->prios[i];
if (prio->priority == 0)
break;
if (prio->priority == priority)
goto again;
}
return priority;
}
static void test_parman_prios_init(struct test_parman *test_parman)
{
int i;
for (i = 0; i < TEST_PARMAN_PRIO_COUNT; i++) {
struct test_parman_prio *prio = &test_parman->prios[i];
/* Assign random uniqueue priority to each prio structure */
prio->priority = test_parman_priority_gen(test_parman);
parman_prio_init(test_parman->parman, &prio->parman_prio,
prio->priority);
}
}
static void test_parman_prios_fini(struct test_parman *test_parman)
{
int i;
for (i = 0; i < TEST_PARMAN_PRIO_COUNT; i++) {
struct test_parman_prio *prio = &test_parman->prios[i];
parman_prio_fini(&prio->parman_prio);
}
}
static void test_parman_items_init(struct test_parman *test_parman)
{
int i;
for (i = 0; i < TEST_PARMAN_ITEM_COUNT; i++) {
struct test_parman_item *item = &test_parman->items[i];
unsigned int prio_index = test_parman_rnd_get(test_parman) &
TEST_PARMAN_PRIO_MASK;
/* Assign random prio to each item structure */
item->prio = &test_parman->prios[prio_index];
}
}
static void test_parman_items_fini(struct test_parman *test_parman)
{
int i;
for (i = 0; i < TEST_PARMAN_ITEM_COUNT; i++) {
struct test_parman_item *item = &test_parman->items[i];
if (!item->used)
continue;
parman_item_remove(test_parman->parman,
&item->prio->parman_prio,
&item->parman_item);
}
}
static struct test_parman *test_parman_create(const struct parman_ops *ops)
{
struct test_parman *test_parman;
int err;
test_parman = kzalloc(sizeof(*test_parman), GFP_KERNEL);
if (!test_parman)
return ERR_PTR(-ENOMEM);
err = test_parman_resize(test_parman, TEST_PARMAN_BASE_COUNT);
if (err)
goto err_resize;
test_parman->parman = parman_create(ops, test_parman);
if (!test_parman->parman) {
err = -ENOMEM;
goto err_parman_create;
}
test_parman_rnd_init(test_parman);
test_parman_prios_init(test_parman);
test_parman_items_init(test_parman);
test_parman->run_budget = TEST_PARMAN_RUN_BUDGET;
return test_parman;
err_parman_create:
test_parman_resize(test_parman, 0);
err_resize:
kfree(test_parman);
return ERR_PTR(err);
}
static void test_parman_destroy(struct test_parman *test_parman)
{
test_parman_items_fini(test_parman);
test_parman_prios_fini(test_parman);
parman_destroy(test_parman->parman);
test_parman_resize(test_parman, 0);
kfree(test_parman);
}
static bool test_parman_run_check_budgets(struct test_parman *test_parman)
{
if (test_parman->run_budget-- == 0)
return false;
if (test_parman->bulk_budget-- != 0)
return true;
test_parman->bulk_budget = test_parman_rnd_get(test_parman) &
TEST_PARMAN_BULK_MAX_MASK;
test_parman->bulk_noop = test_parman_rnd_get(test_parman) & 1;
return true;
}
static int test_parman_run(struct test_parman *test_parman)
{
unsigned int i = test_parman_rnd_get(test_parman);
int err;
while (test_parman_run_check_budgets(test_parman)) {
unsigned int item_index = i++ & TEST_PARMAN_ITEM_MASK;
struct test_parman_item *item = &test_parman->items[item_index];
if (test_parman->bulk_noop)
continue;
if (!item->used) {
err = parman_item_add(test_parman->parman,
&item->prio->parman_prio,
&item->parman_item);
if (err)
return err;
test_parman->prio_array[item->parman_item.index] = item;
test_parman->used_items++;
} else {
test_parman->prio_array[item->parman_item.index] = NULL;
parman_item_remove(test_parman->parman,
&item->prio->parman_prio,
&item->parman_item);
test_parman->used_items--;
}
item->used = !item->used;
}
return 0;
}
static int test_parman_check_array(struct test_parman *test_parman,
bool gaps_allowed)
{
unsigned int last_unused_items = 0;
unsigned long last_priority = 0;
unsigned int used_items = 0;
int i;
if (test_parman->prio_array_limit < TEST_PARMAN_BASE_COUNT) {
pr_err("Array limit is lower than the base count (%lu < %lu)\n",
test_parman->prio_array_limit, TEST_PARMAN_BASE_COUNT);
return -EINVAL;
}
for (i = 0; i < test_parman->prio_array_limit; i++) {
struct test_parman_item *item = test_parman->prio_array[i];
if (!item) {
last_unused_items++;
continue;
}
if (last_unused_items && !gaps_allowed) {
pr_err("Gap found in array even though they are forbidden\n");
return -EINVAL;
}
last_unused_items = 0;
used_items++;
if (item->prio->priority < last_priority) {
pr_err("Item belongs under higher priority then the last one (current: %lu, previous: %lu)\n",
item->prio->priority, last_priority);
return -EINVAL;
}
last_priority = item->prio->priority;
if (item->parman_item.index != i) {
pr_err("Item has different index in compare to where it actualy is (%lu != %d)\n",
item->parman_item.index, i);
return -EINVAL;
}
}
if (used_items != test_parman->used_items) {
pr_err("Number of used items in array does not match (%u != %u)\n",
used_items, test_parman->used_items);
return -EINVAL;
}
if (last_unused_items >= TEST_PARMAN_RESIZE_STEP_COUNT) {
pr_err("Number of unused item at the end of array is bigger than resize step (%u >= %lu)\n",
last_unused_items, TEST_PARMAN_RESIZE_STEP_COUNT);
return -EINVAL;
}
pr_info("Priority array check successful\n");
return 0;
}
static int test_parman_lsort(void)
{
struct test_parman *test_parman;
int err;
test_parman = test_parman_create(&test_parman_lsort_ops);
if (IS_ERR(test_parman))
return PTR_ERR(test_parman);
err = test_parman_run(test_parman);
if (err)
goto out;
err = test_parman_check_array(test_parman, false);
if (err)
goto out;
out:
test_parman_destroy(test_parman);
return err;
}
static int __init test_parman_init(void)
{
return test_parman_lsort();
}
static void __exit test_parman_exit(void)
{
}
module_init(test_parman_init);
module_exit(test_parman_exit);
MODULE_LICENSE("Dual BSD/GPL");
MODULE_AUTHOR("Jiri Pirko <jiri@mellanox.com>");
MODULE_DESCRIPTION("Test module for parman");