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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* GRU KERNEL MCS INSTRUCTIONS
*
* Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved.
*/
#include <linux/kernel.h>
#include "gru.h"
#include "grulib.h"
#include "grutables.h"
/* 10 sec */
#include <linux/sync_core.h>
#include <asm/tsc.h>
#define GRU_OPERATION_TIMEOUT ((cycles_t) tsc_khz*10*1000)
#define CLKS2NSEC(c) ((c) * 1000000 / tsc_khz)
/* Extract the status field from a kernel handle */
#define GET_MSEG_HANDLE_STATUS(h) (((*(unsigned long *)(h)) >> 16) & 3)
struct mcs_op_statistic mcs_op_statistics[mcsop_last];
static void update_mcs_stats(enum mcs_op op, unsigned long clks)
{
unsigned long nsec;
nsec = CLKS2NSEC(clks);
atomic_long_inc(&mcs_op_statistics[op].count);
atomic_long_add(nsec, &mcs_op_statistics[op].total);
if (mcs_op_statistics[op].max < nsec)
mcs_op_statistics[op].max = nsec;
}
static void start_instruction(void *h)
{
unsigned long *w0 = h;
wmb(); /* setting CMD/STATUS bits must be last */
*w0 = *w0 | 0x20001;
gru_flush_cache(h);
}
static void report_instruction_timeout(void *h)
{
unsigned long goff = GSEGPOFF((unsigned long)h);
char *id = "???";
if (TYPE_IS(CCH, goff))
id = "CCH";
else if (TYPE_IS(TGH, goff))
id = "TGH";
else if (TYPE_IS(TFH, goff))
id = "TFH";
panic(KERN_ALERT "GRU %p (%s) is malfunctioning\n", h, id);
}
static int wait_instruction_complete(void *h, enum mcs_op opc)
{
int status;
unsigned long start_time = get_cycles();
while (1) {
cpu_relax();
status = GET_MSEG_HANDLE_STATUS(h);
if (status != CCHSTATUS_ACTIVE)
break;
if (GRU_OPERATION_TIMEOUT < (get_cycles() - start_time)) {
report_instruction_timeout(h);
start_time = get_cycles();
}
}
if (gru_options & OPT_STATS)
update_mcs_stats(opc, get_cycles() - start_time);
return status;
}
int cch_allocate(struct gru_context_configuration_handle *cch)
{
int ret;
cch->opc = CCHOP_ALLOCATE;
start_instruction(cch);
ret = wait_instruction_complete(cch, cchop_allocate);
/*
* Stop speculation into the GSEG being mapped by the previous ALLOCATE.
* The GSEG memory does not exist until the ALLOCATE completes.
*/
sync_core();
return ret;
}
int cch_start(struct gru_context_configuration_handle *cch)
{
cch->opc = CCHOP_START;
start_instruction(cch);
return wait_instruction_complete(cch, cchop_start);
}
int cch_interrupt(struct gru_context_configuration_handle *cch)
{
cch->opc = CCHOP_INTERRUPT;
start_instruction(cch);
return wait_instruction_complete(cch, cchop_interrupt);
}
int cch_deallocate(struct gru_context_configuration_handle *cch)
{
int ret;
cch->opc = CCHOP_DEALLOCATE;
start_instruction(cch);
ret = wait_instruction_complete(cch, cchop_deallocate);
/*
* Stop speculation into the GSEG being unmapped by the previous
* DEALLOCATE.
*/
sync_core();
return ret;
}
int cch_interrupt_sync(struct gru_context_configuration_handle
*cch)
{
cch->opc = CCHOP_INTERRUPT_SYNC;
start_instruction(cch);
return wait_instruction_complete(cch, cchop_interrupt_sync);
}
int tgh_invalidate(struct gru_tlb_global_handle *tgh,
unsigned long vaddr, unsigned long vaddrmask,
int asid, int pagesize, int global, int n,
unsigned short ctxbitmap)
{
tgh->vaddr = vaddr;
tgh->asid = asid;
tgh->pagesize = pagesize;
tgh->n = n;
tgh->global = global;
tgh->vaddrmask = vaddrmask;
tgh->ctxbitmap = ctxbitmap;
tgh->opc = TGHOP_TLBINV;
start_instruction(tgh);
return wait_instruction_complete(tgh, tghop_invalidate);
}
int tfh_write_only(struct gru_tlb_fault_handle *tfh,
unsigned long paddr, int gaa,
unsigned long vaddr, int asid, int dirty,
int pagesize)
{
tfh->fillasid = asid;
tfh->fillvaddr = vaddr;
tfh->pfn = paddr >> GRU_PADDR_SHIFT;
tfh->gaa = gaa;
tfh->dirty = dirty;
tfh->pagesize = pagesize;
tfh->opc = TFHOP_WRITE_ONLY;
start_instruction(tfh);
return wait_instruction_complete(tfh, tfhop_write_only);
}
void tfh_write_restart(struct gru_tlb_fault_handle *tfh,
unsigned long paddr, int gaa,
unsigned long vaddr, int asid, int dirty,
int pagesize)
{
tfh->fillasid = asid;
tfh->fillvaddr = vaddr;
tfh->pfn = paddr >> GRU_PADDR_SHIFT;
tfh->gaa = gaa;
tfh->dirty = dirty;
tfh->pagesize = pagesize;
tfh->opc = TFHOP_WRITE_RESTART;
start_instruction(tfh);
}
void tfh_user_polling_mode(struct gru_tlb_fault_handle *tfh)
{
tfh->opc = TFHOP_USER_POLLING_MODE;
start_instruction(tfh);
}
void tfh_exception(struct gru_tlb_fault_handle *tfh)
{
tfh->opc = TFHOP_EXCEPTION;
start_instruction(tfh);
}
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