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/*
* spu_switch.c
*
* (C) Copyright IBM Corp. 2005
*
* Author: Mark Nutter <mnutter@us.ibm.com>
*
* Host-side part of SPU context switch sequence outlined in
* Synergistic Processor Element, Book IV.
*
* A fully premptive switch of an SPE is very expensive in terms
* of time and system resources. SPE Book IV indicates that SPE
* allocation should follow a "serially reusable device" model,
* in which the SPE is assigned a task until it completes. When
* this is not possible, this sequence may be used to premptively
* save, and then later (optionally) restore the context of a
* program executing on an SPE.
*
*
* 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.
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/vmalloc.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <asm/io.h>
#include <asm/spu.h>
#include <asm/spu_csa.h>
#include <asm/mmu_context.h>
#include "spu_save_dump.h"
#include "spu_restore_dump.h"
/**
* spu_save - SPU context save, with locking.
* @prev: pointer to SPU context save area, to be saved.
* @spu: pointer to SPU iomem structure.
*
* Acquire locks, perform the save operation then return.
*/
int spu_save(struct spu_state *prev, struct spu *spu)
{
/* XXX missing */
return 0;
}
/**
* spu_restore - SPU context restore, with harvest and locking.
* @new: pointer to SPU context save area, to be restored.
* @spu: pointer to SPU iomem structure.
*
* Perform harvest + restore, as we may not be coming
* from a previous succesful save operation, and the
* hardware state is unknown.
*/
int spu_restore(struct spu_state *new, struct spu *spu)
{
/* XXX missing */
return 0;
}
/**
* spu_switch - SPU context switch (save + restore).
* @prev: pointer to SPU context save area, to be saved.
* @new: pointer to SPU context save area, to be restored.
* @spu: pointer to SPU iomem structure.
*
* Perform save, then restore. Only harvest if the
* save fails, as cleanup is otherwise not needed.
*/
int spu_switch(struct spu_state *prev, struct spu_state *new, struct spu *spu)
{
/* XXX missing */
return 0;
}
static void init_prob(struct spu_state *csa)
{
csa->spu_chnlcnt_RW[9] = 1;
csa->spu_chnlcnt_RW[21] = 16;
csa->spu_chnlcnt_RW[23] = 1;
csa->spu_chnlcnt_RW[28] = 1;
csa->spu_chnlcnt_RW[30] = 1;
csa->prob.spu_runcntl_RW = SPU_RUNCNTL_STOP;
}
static void init_priv1(struct spu_state *csa)
{
/* Enable decode, relocate, tlbie response, master runcntl. */
csa->priv1.mfc_sr1_RW = MFC_STATE1_LOCAL_STORAGE_DECODE_MASK |
MFC_STATE1_MASTER_RUN_CONTROL_MASK |
MFC_STATE1_PROBLEM_STATE_MASK |
MFC_STATE1_RELOCATE_MASK | MFC_STATE1_BUS_TLBIE_MASK;
/* Set storage description. */
csa->priv1.mfc_sdr_RW = mfspr(SPRN_SDR1);
/* Enable OS-specific set of interrupts. */
csa->priv1.int_mask_class0_RW = CLASS0_ENABLE_DMA_ALIGNMENT_INTR |
CLASS0_ENABLE_INVALID_DMA_COMMAND_INTR |
CLASS0_ENABLE_SPU_ERROR_INTR;
csa->priv1.int_mask_class1_RW = CLASS1_ENABLE_SEGMENT_FAULT_INTR |
CLASS1_ENABLE_STORAGE_FAULT_INTR;
csa->priv1.int_mask_class2_RW = CLASS2_ENABLE_MAILBOX_INTR |
CLASS2_ENABLE_SPU_STOP_INTR | CLASS2_ENABLE_SPU_HALT_INTR;
}
static void init_priv2(struct spu_state *csa)
{
csa->priv2.spu_lslr_RW = LS_ADDR_MASK;
csa->priv2.mfc_control_RW = MFC_CNTL_RESUME_DMA_QUEUE |
MFC_CNTL_NORMAL_DMA_QUEUE_OPERATION |
MFC_CNTL_DMA_QUEUES_EMPTY_MASK;
}
/**
* spu_alloc_csa - allocate and initialize an SPU context save area.
*
* Allocate and initialize the contents of an SPU context save area.
* This includes enabling address translation, interrupt masks, etc.,
* as appropriate for the given OS environment.
*
* Note that storage for the 'lscsa' is allocated separately,
* as it is by far the largest of the context save regions,
* and may need to be pinned or otherwise specially aligned.
*/
void spu_init_csa(struct spu_state *csa)
{
struct spu_lscsa *lscsa;
if (!csa)
return;
memset(csa, 0, sizeof(struct spu_state));
lscsa = vmalloc(sizeof(struct spu_lscsa));
if (!lscsa)
return;
memset(lscsa, 0, sizeof(struct spu_lscsa));
csa->lscsa = lscsa;
init_prob(csa);
init_priv1(csa);
init_priv2(csa);
}
void spu_fini_csa(struct spu_state *csa)
{
vfree(csa->lscsa);
}
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