Revision ac655fb7626ea63b12ee5f449a082c79db6d2f26 authored by David Daney on 15 January 2015, 13:11:05 UTC, committed by Ralf Baechle on 20 February 2015, 14:28:29 UTC
The wide multiplier is twice as wide, so we need to save twice as much state. Detect the multiplier type (CPU type) at start up and install model specific handlers. [aleksey.makarov@auriga.com: conflict resolution, support for old compilers] Signed-off-by: David Daney <david.daney@cavium.com> Signed-off-by: Leonid Rosenboim <lrosenboim@caviumnetworks.com> Signed-off-by: Aleksey Makarov <aleksey.makarov@auriga.com> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/8933/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
1 parent 9d6b80f
blk-mq-cpumap.c
/*
* CPU <-> hardware queue mapping helpers
*
* Copyright (C) 2013-2014 Jens Axboe
*/
#include <linux/kernel.h>
#include <linux/threads.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/cpu.h>
#include <linux/blk-mq.h>
#include "blk.h"
#include "blk-mq.h"
static int cpu_to_queue_index(unsigned int nr_cpus, unsigned int nr_queues,
const int cpu)
{
return cpu * nr_queues / nr_cpus;
}
static int get_first_sibling(unsigned int cpu)
{
unsigned int ret;
ret = cpumask_first(topology_thread_cpumask(cpu));
if (ret < nr_cpu_ids)
return ret;
return cpu;
}
int blk_mq_update_queue_map(unsigned int *map, unsigned int nr_queues)
{
unsigned int i, nr_cpus, nr_uniq_cpus, queue, first_sibling;
cpumask_var_t cpus;
if (!alloc_cpumask_var(&cpus, GFP_ATOMIC))
return 1;
cpumask_clear(cpus);
nr_cpus = nr_uniq_cpus = 0;
for_each_online_cpu(i) {
nr_cpus++;
first_sibling = get_first_sibling(i);
if (!cpumask_test_cpu(first_sibling, cpus))
nr_uniq_cpus++;
cpumask_set_cpu(i, cpus);
}
queue = 0;
for_each_possible_cpu(i) {
if (!cpu_online(i)) {
map[i] = 0;
continue;
}
/*
* Easy case - we have equal or more hardware queues. Or
* there are no thread siblings to take into account. Do
* 1:1 if enough, or sequential mapping if less.
*/
if (nr_queues >= nr_cpus || nr_cpus == nr_uniq_cpus) {
map[i] = cpu_to_queue_index(nr_cpus, nr_queues, queue);
queue++;
continue;
}
/*
* Less then nr_cpus queues, and we have some number of
* threads per cores. Map sibling threads to the same
* queue.
*/
first_sibling = get_first_sibling(i);
if (first_sibling == i) {
map[i] = cpu_to_queue_index(nr_uniq_cpus, nr_queues,
queue);
queue++;
} else
map[i] = map[first_sibling];
}
free_cpumask_var(cpus);
return 0;
}
unsigned int *blk_mq_make_queue_map(struct blk_mq_tag_set *set)
{
unsigned int *map;
/* If cpus are offline, map them to first hctx */
map = kzalloc_node(sizeof(*map) * nr_cpu_ids, GFP_KERNEL,
set->numa_node);
if (!map)
return NULL;
if (!blk_mq_update_queue_map(map, set->nr_hw_queues))
return map;
kfree(map);
return NULL;
}
/*
* We have no quick way of doing reverse lookups. This is only used at
* queue init time, so runtime isn't important.
*/
int blk_mq_hw_queue_to_node(unsigned int *mq_map, unsigned int index)
{
int i;
for_each_possible_cpu(i) {
if (index == mq_map[i])
return cpu_to_node(i);
}
return NUMA_NO_NODE;
}
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