linux/arch/powerpc/platforms/cell/spu_base.c

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/*
* Low-level SPU handling
*
* (C) Copyright IBM Deutschland Entwicklung GmbH 2005
*
* Author: Arnd Bergmann <arndb@de.ibm.com>
*
* 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.
*/
#define DEBUG 1
#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/poll.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/wait.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/semaphore.h>
#include <asm/spu.h>
#include <asm/mmu_context.h>
#include "interrupt.h"
static int __spu_trap_invalid_dma(struct spu *spu)
{
pr_debug("%s\n", __FUNCTION__);
force_sig(SIGBUS, /* info, */ current);
return 0;
}
static int __spu_trap_dma_align(struct spu *spu)
{
pr_debug("%s\n", __FUNCTION__);
force_sig(SIGBUS, /* info, */ current);
return 0;
}
static int __spu_trap_error(struct spu *spu)
{
pr_debug("%s\n", __FUNCTION__);
force_sig(SIGILL, /* info, */ current);
return 0;
}
static void spu_restart_dma(struct spu *spu)
{
struct spu_priv2 __iomem *priv2 = spu->priv2;
if (!test_bit(SPU_CONTEXT_SWITCH_PENDING_nr, &spu->flags))
out_be64(&priv2->mfc_control_RW, MFC_CNTL_RESTART_DMA_COMMAND);
}
static int __spu_trap_data_seg(struct spu *spu, unsigned long ea)
{
struct spu_priv2 __iomem *priv2 = spu->priv2;
struct mm_struct *mm = spu->mm;
u64 esid, vsid;
pr_debug("%s\n", __FUNCTION__);
if (test_bit(SPU_CONTEXT_SWITCH_ACTIVE_nr, &spu->flags)) {
/* SLBs are pre-loaded for context switch, so
* we should never get here!
*/
printk("%s: invalid access during switch!\n", __func__);
return 1;
}
if (!mm || (REGION_ID(ea) != USER_REGION_ID)) {
/* Future: support kernel segments so that drivers
* can use SPUs.
*/
pr_debug("invalid region access at %016lx\n", ea);
return 1;
}
esid = (ea & ESID_MASK) | SLB_ESID_V;
vsid = (get_vsid(mm->context.id, ea) << SLB_VSID_SHIFT) | SLB_VSID_USER;
if (in_hugepage_area(mm->context, ea))
vsid |= SLB_VSID_L;
out_be64(&priv2->slb_index_W, spu->slb_replace);
out_be64(&priv2->slb_vsid_RW, vsid);
out_be64(&priv2->slb_esid_RW, esid);
spu->slb_replace++;
if (spu->slb_replace >= 8)
spu->slb_replace = 0;
spu_restart_dma(spu);
return 0;
}
extern int hash_page(unsigned long ea, unsigned long access, unsigned long trap); //XXX
static int __spu_trap_data_map(struct spu *spu, unsigned long ea, u64 dsisr)
{
pr_debug("%s\n", __FUNCTION__);
/* Handle kernel space hash faults immediately.
User hash faults need to be deferred to process context. */
if ((dsisr & MFC_DSISR_PTE_NOT_FOUND)
&& REGION_ID(ea) != USER_REGION_ID
&& hash_page(ea, _PAGE_PRESENT, 0x300) == 0) {
spu_restart_dma(spu);
return 0;
}
if (test_bit(SPU_CONTEXT_SWITCH_ACTIVE_nr, &spu->flags)) {
printk("%s: invalid access during switch!\n", __func__);
return 1;
}
spu->dar = ea;
spu->dsisr = dsisr;
mb();
wake_up(&spu->stop_wq);
return 0;
}
static int __spu_trap_mailbox(struct spu *spu)
{
if (spu->ibox_callback)
spu->ibox_callback(spu);
/* atomically disable SPU mailbox interrupts */
spin_lock(&spu->register_lock);
out_be64(&spu->priv1->int_mask_class2_RW,
in_be64(&spu->priv1->int_mask_class2_RW) & ~0x1);
spin_unlock(&spu->register_lock);
return 0;
}
static int __spu_trap_stop(struct spu *spu)
{
pr_debug("%s\n", __FUNCTION__);
spu->stop_code = in_be32(&spu->problem->spu_status_R);
wake_up(&spu->stop_wq);
return 0;
}
static int __spu_trap_halt(struct spu *spu)
{
pr_debug("%s\n", __FUNCTION__);
spu->stop_code = in_be32(&spu->problem->spu_status_R);
wake_up(&spu->stop_wq);
return 0;
}
static int __spu_trap_tag_group(struct spu *spu)
{
pr_debug("%s\n", __FUNCTION__);
/* wake_up(&spu->dma_wq); */
return 0;
}
static int __spu_trap_spubox(struct spu *spu)
{
if (spu->wbox_callback)
spu->wbox_callback(spu);
/* atomically disable SPU mailbox interrupts */
spin_lock(&spu->register_lock);
out_be64(&spu->priv1->int_mask_class2_RW,
in_be64(&spu->priv1->int_mask_class2_RW) & ~0x10);
spin_unlock(&spu->register_lock);
return 0;
}
static irqreturn_t
spu_irq_class_0(int irq, void *data, struct pt_regs *regs)
{
struct spu *spu;
spu = data;
spu->class_0_pending = 1;
wake_up(&spu->stop_wq);
return IRQ_HANDLED;
}
static int
spu_irq_class_0_bottom(struct spu *spu)
{
unsigned long stat;
spu->class_0_pending = 0;
stat = in_be64(&spu->priv1->int_stat_class0_RW);
if (stat & 1) /* invalid MFC DMA */
__spu_trap_invalid_dma(spu);
if (stat & 2) /* invalid DMA alignment */
__spu_trap_dma_align(spu);
if (stat & 4) /* error on SPU */
__spu_trap_error(spu);
out_be64(&spu->priv1->int_stat_class0_RW, stat);
return 0;
}
static irqreturn_t
spu_irq_class_1(int irq, void *data, struct pt_regs *regs)
{
struct spu *spu;
unsigned long stat, mask, dar, dsisr;
spu = data;
/* atomically read & clear class1 status. */
spin_lock(&spu->register_lock);
mask = in_be64(&spu->priv1->int_mask_class1_RW);
stat = in_be64(&spu->priv1->int_stat_class1_RW) & mask;
dar = in_be64(&spu->priv1->mfc_dar_RW);
dsisr = in_be64(&spu->priv1->mfc_dsisr_RW);
out_be64(&spu->priv1->mfc_dsisr_RW, 0UL);
out_be64(&spu->priv1->int_stat_class1_RW, stat);
spin_unlock(&spu->register_lock);
if (stat & 1) /* segment fault */
__spu_trap_data_seg(spu, dar);
if (stat & 2) { /* mapping fault */
__spu_trap_data_map(spu, dar, dsisr);
}
if (stat & 4) /* ls compare & suspend on get */
;
if (stat & 8) /* ls compare & suspend on put */
;
return stat ? IRQ_HANDLED : IRQ_NONE;
}
static irqreturn_t
spu_irq_class_2(int irq, void *data, struct pt_regs *regs)
{
struct spu *spu;
unsigned long stat;
spu = data;
stat = in_be64(&spu->priv1->int_stat_class2_RW);
pr_debug("class 2 interrupt %d, %lx, %lx\n", irq, stat,
in_be64(&spu->priv1->int_mask_class2_RW));
if (stat & 1) /* PPC core mailbox */
__spu_trap_mailbox(spu);
if (stat & 2) /* SPU stop-and-signal */
__spu_trap_stop(spu);
if (stat & 4) /* SPU halted */
__spu_trap_halt(spu);
if (stat & 8) /* DMA tag group complete */
__spu_trap_tag_group(spu);
if (stat & 0x10) /* SPU mailbox threshold */
__spu_trap_spubox(spu);
out_be64(&spu->priv1->int_stat_class2_RW, stat);
return stat ? IRQ_HANDLED : IRQ_NONE;
}
static int
spu_request_irqs(struct spu *spu)
{
int ret;
int irq_base;
irq_base = IIC_NODE_STRIDE * spu->node + IIC_SPE_OFFSET;
snprintf(spu->irq_c0, sizeof (spu->irq_c0), "spe%02d.0", spu->number);
ret = request_irq(irq_base + spu->isrc,
spu_irq_class_0, 0, spu->irq_c0, spu);
if (ret)
goto out;
out_be64(&spu->priv1->int_mask_class0_RW, 0x7);
snprintf(spu->irq_c1, sizeof (spu->irq_c1), "spe%02d.1", spu->number);
ret = request_irq(irq_base + IIC_CLASS_STRIDE + spu->isrc,
spu_irq_class_1, 0, spu->irq_c1, spu);
if (ret)
goto out1;
out_be64(&spu->priv1->int_mask_class1_RW, 0x3);
snprintf(spu->irq_c2, sizeof (spu->irq_c2), "spe%02d.2", spu->number);
ret = request_irq(irq_base + 2*IIC_CLASS_STRIDE + spu->isrc,
spu_irq_class_2, 0, spu->irq_c2, spu);
if (ret)
goto out2;
out_be64(&spu->priv1->int_mask_class2_RW, 0xe);
goto out;
out2:
free_irq(irq_base + IIC_CLASS_STRIDE + spu->isrc, spu);
out1:
free_irq(irq_base + spu->isrc, spu);
out:
return ret;
}
static void
spu_free_irqs(struct spu *spu)
{
int irq_base;
irq_base = IIC_NODE_STRIDE * spu->node + IIC_SPE_OFFSET;
free_irq(irq_base + spu->isrc, spu);
free_irq(irq_base + IIC_CLASS_STRIDE + spu->isrc, spu);
free_irq(irq_base + 2*IIC_CLASS_STRIDE + spu->isrc, spu);
}
static LIST_HEAD(spu_list);
static DECLARE_MUTEX(spu_mutex);
static void spu_init_channels(struct spu *spu)
{
static const struct {
unsigned channel;
unsigned count;
} zero_list[] = {
{ 0x00, 1, }, { 0x01, 1, }, { 0x03, 1, }, { 0x04, 1, },
{ 0x18, 1, }, { 0x19, 1, }, { 0x1b, 1, }, { 0x1d, 1, },
}, count_list[] = {
{ 0x00, 0, }, { 0x03, 0, }, { 0x04, 0, }, { 0x15, 16, },
{ 0x17, 1, }, { 0x18, 0, }, { 0x19, 0, }, { 0x1b, 0, },
{ 0x1c, 1, }, { 0x1d, 0, }, { 0x1e, 1, },
};
struct spu_priv2 *priv2;
int i;
priv2 = spu->priv2;
/* initialize all channel data to zero */
for (i = 0; i < ARRAY_SIZE(zero_list); i++) {
int count;
out_be64(&priv2->spu_chnlcntptr_RW, zero_list[i].channel);
for (count = 0; count < zero_list[i].count; count++)
out_be64(&priv2->spu_chnldata_RW, 0);
}
/* initialize channel counts to meaningful values */
for (i = 0; i < ARRAY_SIZE(count_list); i++) {
out_be64(&priv2->spu_chnlcntptr_RW, count_list[i].channel);
out_be64(&priv2->spu_chnlcnt_RW, count_list[i].count);
}
}
static void spu_init_regs(struct spu *spu)
{
out_be64(&spu->priv1->int_mask_class0_RW, 0x7);
out_be64(&spu->priv1->int_mask_class1_RW, 0x3);
out_be64(&spu->priv1->int_mask_class2_RW, 0xe);
}
struct spu *spu_alloc(void)
{
struct spu *spu;
down(&spu_mutex);
if (!list_empty(&spu_list)) {
spu = list_entry(spu_list.next, struct spu, list);
list_del_init(&spu->list);
pr_debug("Got SPU %x %d\n", spu->isrc, spu->number);
} else {
pr_debug("No SPU left\n");
spu = NULL;
}
up(&spu_mutex);
if (spu) {
spu_init_channels(spu);
spu_init_regs(spu);
}
return spu;
}
EXPORT_SYMBOL_GPL(spu_alloc);
void spu_free(struct spu *spu)
{
down(&spu_mutex);
list_add_tail(&spu->list, &spu_list);
up(&spu_mutex);
}
EXPORT_SYMBOL_GPL(spu_free);
static int spu_handle_mm_fault(struct spu *spu)
{
struct mm_struct *mm = spu->mm;
struct vm_area_struct *vma;
u64 ea, dsisr, is_write;
int ret;
ea = spu->dar;
dsisr = spu->dsisr;
#if 0
if (!IS_VALID_EA(ea)) {
return -EFAULT;
}
#endif /* XXX */
if (mm == NULL) {
return -EFAULT;
}
if (mm->pgd == NULL) {
return -EFAULT;
}
down_read(&mm->mmap_sem);
vma = find_vma(mm, ea);
if (!vma)
goto bad_area;
if (vma->vm_start <= ea)
goto good_area;
if (!(vma->vm_flags & VM_GROWSDOWN))
goto bad_area;
#if 0
if (expand_stack(vma, ea))
goto bad_area;
#endif /* XXX */
good_area:
is_write = dsisr & MFC_DSISR_ACCESS_PUT;
if (is_write) {
if (!(vma->vm_flags & VM_WRITE))
goto bad_area;
} else {
if (dsisr & MFC_DSISR_ACCESS_DENIED)
goto bad_area;
if (!(vma->vm_flags & (VM_READ | VM_EXEC)))
goto bad_area;
}
ret = 0;
switch (handle_mm_fault(mm, vma, ea, is_write)) {
case VM_FAULT_MINOR:
current->min_flt++;
break;
case VM_FAULT_MAJOR:
current->maj_flt++;
break;
case VM_FAULT_SIGBUS:
ret = -EFAULT;
goto bad_area;
case VM_FAULT_OOM:
ret = -ENOMEM;
goto bad_area;
default:
BUG();
}
up_read(&mm->mmap_sem);
return ret;
bad_area:
up_read(&mm->mmap_sem);
return -EFAULT;
}
static int spu_handle_pte_fault(struct spu *spu)
{
u64 ea, dsisr, access, error = 0UL;
int ret = 0;
ea = spu->dar;
dsisr = spu->dsisr;
if (dsisr & MFC_DSISR_PTE_NOT_FOUND) {
access = (_PAGE_PRESENT | _PAGE_USER);
access |= (dsisr & MFC_DSISR_ACCESS_PUT) ? _PAGE_RW : 0UL;
if (hash_page(ea, access, 0x300) != 0)
error |= CLASS1_ENABLE_STORAGE_FAULT_INTR;
}
if ((error & CLASS1_ENABLE_STORAGE_FAULT_INTR) ||
(dsisr & MFC_DSISR_ACCESS_DENIED)) {
if ((ret = spu_handle_mm_fault(spu)) != 0)
error |= CLASS1_ENABLE_STORAGE_FAULT_INTR;
else
error &= ~CLASS1_ENABLE_STORAGE_FAULT_INTR;
}
spu->dar = 0UL;
spu->dsisr = 0UL;
if (!error) {
spu_restart_dma(spu);
} else {
__spu_trap_invalid_dma(spu);
}
return ret;
}
static inline int spu_pending(struct spu *spu, u32 * stat)
{
struct spu_problem __iomem *prob = spu->problem;
u64 pte_fault;
*stat = in_be32(&prob->spu_status_R);
pte_fault = spu->dsisr &
(MFC_DSISR_PTE_NOT_FOUND | MFC_DSISR_ACCESS_DENIED);
return (!(*stat & 0x1) || pte_fault || spu->class_0_pending) ? 1 : 0;
}
int spu_run(struct spu *spu)
{
struct spu_problem __iomem *prob;
struct spu_priv1 __iomem *priv1;
struct spu_priv2 __iomem *priv2;
u32 status;
int ret;
prob = spu->problem;
priv1 = spu->priv1;
priv2 = spu->priv2;
/* Let SPU run. */
eieio();
out_be32(&prob->spu_runcntl_RW, SPU_RUNCNTL_RUNNABLE);
do {
ret = wait_event_interruptible(spu->stop_wq,
spu_pending(spu, &status));
if (spu->dsisr &
(MFC_DSISR_PTE_NOT_FOUND | MFC_DSISR_ACCESS_DENIED))
ret = spu_handle_pte_fault(spu);
if (spu->class_0_pending)
spu_irq_class_0_bottom(spu);
if (!ret && signal_pending(current))
ret = -ERESTARTSYS;
} while (!ret && !(status &
(SPU_STATUS_STOPPED_BY_STOP |
SPU_STATUS_STOPPED_BY_HALT)));
/* Ensure SPU is stopped. */
out_be32(&prob->spu_runcntl_RW, SPU_RUNCNTL_STOP);
eieio();
while (in_be32(&prob->spu_status_R) & SPU_STATUS_RUNNING)
cpu_relax();
out_be64(&priv2->slb_invalidate_all_W, 0);
out_be64(&priv1->tlb_invalidate_entry_W, 0UL);
eieio();
/* Check for SPU breakpoint. */
if (unlikely(current->ptrace & PT_PTRACED)) {
status = in_be32(&prob->spu_status_R);
if ((status & SPU_STATUS_STOPPED_BY_STOP)
&& status >> SPU_STOP_STATUS_SHIFT == 0x3fff) {
force_sig(SIGTRAP, current);
ret = -ERESTARTSYS;
}
}
return ret;
}
EXPORT_SYMBOL_GPL(spu_run);
static void __iomem * __init map_spe_prop(struct device_node *n,
const char *name)
{
struct address_prop {
unsigned long address;
unsigned int len;
} __attribute__((packed)) *prop;
void *p;
int proplen;
p = get_property(n, name, &proplen);
if (proplen != sizeof (struct address_prop))
return NULL;
prop = p;
return ioremap(prop->address, prop->len);
}
static void spu_unmap(struct spu *spu)
{
iounmap(spu->priv2);
iounmap(spu->priv1);
iounmap(spu->problem);
iounmap((u8 __iomem *)spu->local_store);
}
static int __init spu_map_device(struct spu *spu, struct device_node *spe)
{
char *prop;
int ret;
ret = -ENODEV;
prop = get_property(spe, "isrc", NULL);
if (!prop)
goto out;
spu->isrc = *(unsigned int *)prop;
spu->name = get_property(spe, "name", NULL);
if (!spu->name)
goto out;
prop = get_property(spe, "local-store", NULL);
if (!prop)
goto out;
spu->local_store_phys = *(unsigned long *)prop;
/* we use local store as ram, not io memory */
spu->local_store = (void __force *)map_spe_prop(spe, "local-store");
if (!spu->local_store)
goto out;
spu->problem= map_spe_prop(spe, "problem");
if (!spu->problem)
goto out_unmap;
spu->priv1= map_spe_prop(spe, "priv1");
if (!spu->priv1)
goto out_unmap;
spu->priv2= map_spe_prop(spe, "priv2");
if (!spu->priv2)
goto out_unmap;
ret = 0;
goto out;
out_unmap:
spu_unmap(spu);
out:
return ret;
}
static int __init find_spu_node_id(struct device_node *spe)
{
unsigned int *id;
struct device_node *cpu;
cpu = spe->parent->parent;
id = (unsigned int *)get_property(cpu, "node-id", NULL);
return id ? *id : 0;
}
static int __init create_spu(struct device_node *spe)
{
struct spu *spu;
int ret;
static int number;
ret = -ENOMEM;
spu = kmalloc(sizeof (*spu), GFP_KERNEL);
if (!spu)
goto out;
ret = spu_map_device(spu, spe);
if (ret)
goto out_free;
spu->node = find_spu_node_id(spe);
spu->stop_code = 0;
spu->slb_replace = 0;
spu->mm = NULL;
spu->ctx = NULL;
spu->rq = NULL;
spu->pid = 0;
spu->class_0_pending = 0;
spu->flags = 0UL;
spu->dar = 0UL;
spu->dsisr = 0UL;
spin_lock_init(&spu->register_lock);
out_be64(&spu->priv1->mfc_sdr_RW, mfspr(SPRN_SDR1));
out_be64(&spu->priv1->mfc_sr1_RW, 0x33);
init_waitqueue_head(&spu->stop_wq);
spu->ibox_callback = NULL;
spu->wbox_callback = NULL;
down(&spu_mutex);
spu->number = number++;
ret = spu_request_irqs(spu);
if (ret)
goto out_unmap;
list_add(&spu->list, &spu_list);
up(&spu_mutex);
pr_debug(KERN_DEBUG "Using SPE %s %02x %p %p %p %p %d\n",
spu->name, spu->isrc, spu->local_store,
spu->problem, spu->priv1, spu->priv2, spu->number);
goto out;
out_unmap:
up(&spu_mutex);
spu_unmap(spu);
out_free:
kfree(spu);
out:
return ret;
}
static void destroy_spu(struct spu *spu)
{
list_del_init(&spu->list);
spu_free_irqs(spu);
spu_unmap(spu);
kfree(spu);
}
static void cleanup_spu_base(void)
{
struct spu *spu, *tmp;
down(&spu_mutex);
list_for_each_entry_safe(spu, tmp, &spu_list, list)
destroy_spu(spu);
up(&spu_mutex);
}
module_exit(cleanup_spu_base);
static int __init init_spu_base(void)
{
struct device_node *node;
int ret;
ret = -ENODEV;
for (node = of_find_node_by_type(NULL, "spe");
node; node = of_find_node_by_type(node, "spe")) {
ret = create_spu(node);
if (ret) {
printk(KERN_WARNING "%s: Error initializing %s\n",
__FUNCTION__, node->name);
cleanup_spu_base();
break;
}
}
/* in some old firmware versions, the spe is called 'spc', so we
look for that as well */
for (node = of_find_node_by_type(NULL, "spc");
node; node = of_find_node_by_type(node, "spc")) {
ret = create_spu(node);
if (ret) {
printk(KERN_WARNING "%s: Error initializing %s\n",
__FUNCTION__, node->name);
cleanup_spu_base();
break;
}
}
return ret;
}
module_init(init_spu_base);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");