/*
* SGI UltraViolet TLB flush routines.
*
* (c) 2008-2010 Cliff Wickman <cpw@sgi.com>, SGI.
*
* This code is released under the GNU General Public License version 2 or
* later.
*/
#include <linux/seq_file.h>
#include <linux/proc_fs.h>
#include <linux/debugfs.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <asm/mmu_context.h>
#include <asm/uv/uv.h>
#include <asm/uv/uv_mmrs.h>
#include <asm/uv/uv_hub.h>
#include <asm/uv/uv_bau.h>
#include <asm/apic.h>
#include <asm/idle.h>
#include <asm/tsc.h>
#include <asm/irq_vectors.h>
#include <asm/timer.h>
/* timeouts in nanoseconds (indexed by UVH_AGING_PRESCALE_SEL urgency7 30:28) */
static int timeout_base_ns[] = {
20,
160,
1280,
10240,
81920,
655360,
5242880,
167772160
};
static int timeout_us;
static int nobau;
static int baudisabled;
static spinlock_t disable_lock;
static cycles_t congested_cycles;
/* tunables: */
static int max_bau_concurrent = MAX_BAU_CONCURRENT;
static int max_bau_concurrent_constant = MAX_BAU_CONCURRENT;
static int plugged_delay = PLUGGED_DELAY;
static int plugsb4reset = PLUGSB4RESET;
static int timeoutsb4reset = TIMEOUTSB4RESET;
static int ipi_reset_limit = IPI_RESET_LIMIT;
static int complete_threshold = COMPLETE_THRESHOLD;
static int congested_response_us = CONGESTED_RESPONSE_US;
static int congested_reps = CONGESTED_REPS;
static int congested_period = CONGESTED_PERIOD;
static struct dentry *tunables_dir;
static struct dentry *tunables_file;
static int __init setup_nobau(char *arg)
{
nobau = 1;
return 0;
}
early_param("nobau", setup_nobau);
/* base pnode in this partition */
static int uv_partition_base_pnode __read_mostly;
/* position of pnode (which is nasid>>1): */
static int uv_nshift __read_mostly;
static unsigned long uv_mmask __read_mostly;
static DEFINE_PER_CPU(struct ptc_stats, ptcstats);
static DEFINE_PER_CPU(struct bau_control, bau_control);
static DEFINE_PER_CPU(cpumask_var_t, uv_flush_tlb_mask);
/*
* Determine the first node on a uvhub. 'Nodes' are used for kernel
* memory allocation.
*/
static int __init uvhub_to_first_node(int uvhub)
{
int node, b;
for_each_online_node(node) {
b = uv_node_to_blade_id(node);
if (uvhub == b)
return node;
}
return -1;
}
/*
* Determine the apicid of the first cpu on a uvhub.
*/
static int __init uvhub_to_first_apicid(int uvhub)
{
int cpu;
for_each_present_cpu(cpu)
if (uvhub == uv_cpu_to_blade_id(cpu))
return per_cpu(x86_cpu_to_apicid, cpu);
return -1;
}
/*
* Free a software acknowledge hardware resource by clearing its Pending
* bit. This will return a reply to the sender.
* If the message has timed out, a reply has already been sent by the
* hardware but the resource has not been released. In that case our
* clear of the Timeout bit (as well) will free the resourc
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