mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-08 17:49:45 +00:00
f444f1f898
Back in the olden days we added support for using 64K pages to map the SPU (Synergistic Processing Unit) local store on Cell, when the main kernel was using 4K pages. This was useful at the time because distros were using 4K pages, but using 64K pages on the SPUs could reduce TLB pressure there. However these days the number of Cell users is approaching zero, and supporting this option adds unpleasant complexity to the memory management code. So drop the option, CONFIG_SPU_FS_64K_LS, and all related code. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Acked-by: Jeremy Kerr <jk@ozlabs.org>
63 lines
1.6 KiB
C
63 lines
1.6 KiB
C
/*
|
|
* SPU local store allocation routines
|
|
*
|
|
* Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
|
|
*
|
|
* 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, 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., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
#undef DEBUG
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/vmalloc.h>
|
|
|
|
#include <asm/spu.h>
|
|
#include <asm/spu_csa.h>
|
|
#include <asm/mmu.h>
|
|
|
|
#include "spufs.h"
|
|
|
|
int spu_alloc_lscsa(struct spu_state *csa)
|
|
{
|
|
struct spu_lscsa *lscsa;
|
|
unsigned char *p;
|
|
|
|
lscsa = vzalloc(sizeof(struct spu_lscsa));
|
|
if (!lscsa)
|
|
return -ENOMEM;
|
|
csa->lscsa = lscsa;
|
|
|
|
/* Set LS pages reserved to allow for user-space mapping. */
|
|
for (p = lscsa->ls; p < lscsa->ls + LS_SIZE; p += PAGE_SIZE)
|
|
SetPageReserved(vmalloc_to_page(p));
|
|
|
|
return 0;
|
|
}
|
|
|
|
void spu_free_lscsa(struct spu_state *csa)
|
|
{
|
|
/* Clear reserved bit before vfree. */
|
|
unsigned char *p;
|
|
|
|
if (csa->lscsa == NULL)
|
|
return;
|
|
|
|
for (p = csa->lscsa->ls; p < csa->lscsa->ls + LS_SIZE; p += PAGE_SIZE)
|
|
ClearPageReserved(vmalloc_to_page(p));
|
|
|
|
vfree(csa->lscsa);
|
|
}
|