mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 19:29:37 +00:00
![Rickard Strandqvist](/assets/img/avatar_default.png)
Remove the function tfh_restart() that is not used anywhere. This was partially found by using a static code analysis program called cppcheck. Signed-off-by: Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se> Acked-by: Dimitri Sivanich <sivanich@sgi.com> Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
210 lines
5.3 KiB
C
210 lines
5.3 KiB
C
/*
|
|
* GRU KERNEL MCS INSTRUCTIONS
|
|
*
|
|
* Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include "gru.h"
|
|
#include "grulib.h"
|
|
#include "grutables.h"
|
|
|
|
/* 10 sec */
|
|
#ifdef CONFIG_IA64
|
|
#include <asm/processor.h>
|
|
#define GRU_OPERATION_TIMEOUT (((cycles_t) local_cpu_data->itc_freq)*10)
|
|
#define CLKS2NSEC(c) ((c) *1000000000 / local_cpu_data->itc_freq)
|
|
#else
|
|
#include <asm/tsc.h>
|
|
#define GRU_OPERATION_TIMEOUT ((cycles_t) tsc_khz*10*1000)
|
|
#define CLKS2NSEC(c) ((c) * 1000000 / tsc_khz)
|
|
#endif
|
|
|
|
/* 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);
|
|
}
|
|
|