arch/powerpc/platforms/cell/spufs/lscsa_alloc.c

Source file repositories/reference/linux-study-clean/arch/powerpc/platforms/cell/spufs/lscsa_alloc.c

File Facts

System
Linux kernel
Corpus path
arch/powerpc/platforms/cell/spufs/lscsa_alloc.c
Extension
.c
Size
982 bytes
Lines
51
Domain
Architecture Layer
Bucket
arch/powerpc
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * SPU local store allocation routines
 *
 * Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
 */

#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(*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);
}

Annotation

Implementation Notes