| /* |
| * 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. |
| */ |
| |
| #undef DEBUG |
| |
| #include <linux/interrupt.h> |
| #include <linux/list.h> |
| #include <linux/module.h> |
| #include <linux/ptrace.h> |
| #include <linux/slab.h> |
| #include <linux/wait.h> |
| #include <linux/mm.h> |
| #include <linux/io.h> |
| #include <linux/mutex.h> |
| #include <asm/spu.h> |
| #include <asm/spu_priv1.h> |
| #include <asm/xmon.h> |
| |
| const struct spu_management_ops *spu_management_ops; |
| const struct spu_priv1_ops *spu_priv1_ops; |
| |
| EXPORT_SYMBOL_GPL(spu_priv1_ops); |
| |
| static int __spu_trap_invalid_dma(struct spu *spu) |
| { |
| pr_debug("%s\n", __FUNCTION__); |
| spu->dma_callback(spu, SPE_EVENT_INVALID_DMA); |
| return 0; |
| } |
| |
| static int __spu_trap_dma_align(struct spu *spu) |
| { |
| pr_debug("%s\n", __FUNCTION__); |
| spu->dma_callback(spu, SPE_EVENT_DMA_ALIGNMENT); |
| return 0; |
| } |
| |
| static int __spu_trap_error(struct spu *spu) |
| { |
| pr_debug("%s\n", __FUNCTION__); |
| spu->dma_callback(spu, SPE_EVENT_SPE_ERROR); |
| return 0; |
| } |
| |
| static void spu_restart_dma(struct spu *spu) |
| { |
| struct spu_priv2 __iomem *priv2 = spu->priv2; |
| |
| if (!test_bit(SPU_CONTEXT_SWITCH_PENDING, &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, llp; |
| |
| pr_debug("%s\n", __FUNCTION__); |
| |
| if (test_bit(SPU_CONTEXT_SWITCH_ACTIVE, &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; |
| } |
| esid = (ea & ESID_MASK) | SLB_ESID_V; |
| |
| switch(REGION_ID(ea)) { |
| case USER_REGION_ID: |
| #ifdef CONFIG_HUGETLB_PAGE |
| if (in_hugepage_area(mm->context, ea)) |
| llp = mmu_psize_defs[mmu_huge_psize].sllp; |
| else |
| #endif |
| llp = mmu_psize_defs[mmu_virtual_psize].sllp; |
| vsid = (get_vsid(mm->context.id, ea) << SLB_VSID_SHIFT) | |
| SLB_VSID_USER | llp; |
| break; |
| case VMALLOC_REGION_ID: |
| llp = mmu_psize_defs[mmu_virtual_psize].sllp; |
| vsid = (get_kernel_vsid(ea) << SLB_VSID_SHIFT) | |
| SLB_VSID_KERNEL | llp; |
| break; |
| case KERNEL_REGION_ID: |
| llp = mmu_psize_defs[mmu_linear_psize].sllp; |
| vsid = (get_kernel_vsid(ea) << SLB_VSID_SHIFT) | |
| SLB_VSID_KERNEL | llp; |
| break; |
| default: |
| /* Future: support kernel segments so that drivers |
| * can use SPUs. |
| */ |
| pr_debug("invalid region access at %016lx\n", ea); |
| return 1; |
| } |
| |
| 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, %lx, %lx\n", __FUNCTION__, dsisr, ea); |
| |
| /* 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, &spu->flags)) { |
| printk("%s: invalid access during switch!\n", __func__); |
| return 1; |
| } |
| |
| spu->dar = ea; |
| spu->dsisr = dsisr; |
| mb(); |
| spu->stop_callback(spu); |
| return 0; |
| } |
| |
| static irqreturn_t |
| spu_irq_class_0(int irq, void *data) |
| { |
| struct spu *spu; |
| |
| spu = data; |
| spu->class_0_pending = 1; |
| spu->stop_callback(spu); |
| |
| return IRQ_HANDLED; |
| } |
| |
| int |
| spu_irq_class_0_bottom(struct spu *spu) |
| { |
| unsigned long stat, mask; |
| |
| spu->class_0_pending = 0; |
| |
| mask = spu_int_mask_get(spu, 0); |
| stat = spu_int_stat_get(spu, 0); |
| |
| stat &= mask; |
| |
| if (stat & 1) /* invalid DMA alignment */ |
| __spu_trap_dma_align(spu); |
| |
| if (stat & 2) /* invalid MFC DMA */ |
| __spu_trap_invalid_dma(spu); |
| |
| if (stat & 4) /* error on SPU */ |
| __spu_trap_error(spu); |
| |
| spu_int_stat_clear(spu, 0, stat); |
| |
| return (stat & 0x7) ? -EIO : 0; |
| } |
| EXPORT_SYMBOL_GPL(spu_irq_class_0_bottom); |
| |
| static irqreturn_t |
| spu_irq_class_1(int irq, void *data) |
| { |
| struct spu *spu; |
| unsigned long stat, mask, dar, dsisr; |
| |
| spu = data; |
| |
| /* atomically read & clear class1 status. */ |
| spin_lock(&spu->register_lock); |
| mask = spu_int_mask_get(spu, 1); |
| stat = spu_int_stat_get(spu, 1) & mask; |
| dar = spu_mfc_dar_get(spu); |
| dsisr = spu_mfc_dsisr_get(spu); |
| if (stat & 2) /* mapping fault */ |
| spu_mfc_dsisr_set(spu, 0ul); |
| spu_int_stat_clear(spu, 1, stat); |
| spin_unlock(&spu->register_lock); |
| pr_debug("%s: %lx %lx %lx %lx\n", __FUNCTION__, mask, stat, |
| dar, dsisr); |
| |
| 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; |
| } |
| EXPORT_SYMBOL_GPL(spu_irq_class_1_bottom); |
| |
| static irqreturn_t |
| spu_irq_class_2(int irq, void *data) |
| { |
| struct spu *spu; |
| unsigned long stat; |
| unsigned long mask; |
| |
| spu = data; |
| spin_lock(&spu->register_lock); |
| stat = spu_int_stat_get(spu, 2); |
| mask = spu_int_mask_get(spu, 2); |
| /* ignore interrupts we're not waiting for */ |
| stat &= mask; |
| /* |
| * mailbox interrupts (0x1 and 0x10) are level triggered. |
| * mask them now before acknowledging. |
| */ |
| if (stat & 0x11) |
| spu_int_mask_and(spu, 2, ~(stat & 0x11)); |
| /* acknowledge all interrupts before the callbacks */ |
| spu_int_stat_clear(spu, 2, stat); |
| spin_unlock(&spu->register_lock); |
| |
| pr_debug("class 2 interrupt %d, %lx, %lx\n", irq, stat, mask); |
| |
| if (stat & 1) /* PPC core mailbox */ |
| spu->ibox_callback(spu); |
| |
| if (stat & 2) /* SPU stop-and-signal */ |
| spu->stop_callback(spu); |
| |
| if (stat & 4) /* SPU halted */ |
| spu->stop_callback(spu); |
| |
| if (stat & 8) /* DMA tag group complete */ |
| spu->mfc_callback(spu); |
| |
| if (stat & 0x10) /* SPU mailbox threshold */ |
| spu->wbox_callback(spu); |
| |
| return stat ? IRQ_HANDLED : IRQ_NONE; |
| } |
| |
| static int spu_request_irqs(struct spu *spu) |
| { |
| int ret = 0; |
| |
| if (spu->irqs[0] != NO_IRQ) { |
| snprintf(spu->irq_c0, sizeof (spu->irq_c0), "spe%02d.0", |
| spu->number); |
| ret = request_irq(spu->irqs[0], spu_irq_class_0, |
| IRQF_DISABLED, |
| spu->irq_c0, spu); |
| if (ret) |
| goto bail0; |
| } |
| if (spu->irqs[1] != NO_IRQ) { |
| snprintf(spu->irq_c1, sizeof (spu->irq_c1), "spe%02d.1", |
| spu->number); |
| ret = request_irq(spu->irqs[1], spu_irq_class_1, |
| IRQF_DISABLED, |
| spu->irq_c1, spu); |
| if (ret) |
| goto bail1; |
| } |
| if (spu->irqs[2] != NO_IRQ) { |
| snprintf(spu->irq_c2, sizeof (spu->irq_c2), "spe%02d.2", |
| spu->number); |
| ret = request_irq(spu->irqs[2], spu_irq_class_2, |
| IRQF_DISABLED, |
| spu->irq_c2, spu); |
| if (ret) |
| goto bail2; |
| } |
| return 0; |
| |
| bail2: |
| if (spu->irqs[1] != NO_IRQ) |
| free_irq(spu->irqs[1], spu); |
| bail1: |
| if (spu->irqs[0] != NO_IRQ) |
| free_irq(spu->irqs[0], spu); |
| bail0: |
| return ret; |
| } |
| |
| static void spu_free_irqs(struct spu *spu) |
| { |
| if (spu->irqs[0] != NO_IRQ) |
| free_irq(spu->irqs[0], spu); |
| if (spu->irqs[1] != NO_IRQ) |
| free_irq(spu->irqs[1], spu); |
| if (spu->irqs[2] != NO_IRQ) |
| free_irq(spu->irqs[2], spu); |
| } |
| |
| static struct list_head spu_list[MAX_NUMNODES]; |
| static LIST_HEAD(spu_full_list); |
| static DEFINE_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 __iomem *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); |
| } |
| } |
| |
| struct spu *spu_alloc_node(int node) |
| { |
| struct spu *spu = NULL; |
| |
| mutex_lock(&spu_mutex); |
| if (!list_empty(&spu_list[node])) { |
| spu = list_entry(spu_list[node].next, struct spu, list); |
| list_del_init(&spu->list); |
| pr_debug("Got SPU %d %d\n", spu->number, spu->node); |
| spu_init_channels(spu); |
| } |
| mutex_unlock(&spu_mutex); |
| |
| return spu; |
| } |
| EXPORT_SYMBOL_GPL(spu_alloc_node); |
| |
| struct spu *spu_alloc(void) |
| { |
| struct spu *spu = NULL; |
| int node; |
| |
| for (node = 0; node < MAX_NUMNODES; node++) { |
| spu = spu_alloc_node(node); |
| if (spu) |
| break; |
| } |
| |
| return spu; |
| } |
| |
| void spu_free(struct spu *spu) |
| { |
| mutex_lock(&spu_mutex); |
| list_add_tail(&spu->list, &spu_list[spu->node]); |
| mutex_unlock(&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; |
| } |
| |
| int spu_irq_class_1_bottom(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 | MFC_DSISR_ACCESS_DENIED)) { |
| u64 flags; |
| |
| access = (_PAGE_PRESENT | _PAGE_USER); |
| access |= (dsisr & MFC_DSISR_ACCESS_PUT) ? _PAGE_RW : 0UL; |
| local_irq_save(flags); |
| if (hash_page(ea, access, 0x300) != 0) |
| error |= CLASS1_ENABLE_STORAGE_FAULT_INTR; |
| local_irq_restore(flags); |
| } |
| if (error & CLASS1_ENABLE_STORAGE_FAULT_INTR) { |
| 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->dma_callback(spu, SPE_EVENT_SPE_DATA_STORAGE); |
| } |
| return ret; |
| } |
| |
| struct sysdev_class spu_sysdev_class = { |
| set_kset_name("spu") |
| }; |
| |
| int spu_add_sysdev_attr(struct sysdev_attribute *attr) |
| { |
| struct spu *spu; |
| mutex_lock(&spu_mutex); |
| |
| list_for_each_entry(spu, &spu_full_list, full_list) |
| sysdev_create_file(&spu->sysdev, attr); |
| |
| mutex_unlock(&spu_mutex); |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(spu_add_sysdev_attr); |
| |
| int spu_add_sysdev_attr_group(struct attribute_group *attrs) |
| { |
| struct spu *spu; |
| mutex_lock(&spu_mutex); |
| |
| list_for_each_entry(spu, &spu_full_list, full_list) |
| sysfs_create_group(&spu->sysdev.kobj, attrs); |
| |
| mutex_unlock(&spu_mutex); |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(spu_add_sysdev_attr_group); |
| |
| |
| void spu_remove_sysdev_attr(struct sysdev_attribute *attr) |
| { |
| struct spu *spu; |
| mutex_lock(&spu_mutex); |
| |
| list_for_each_entry(spu, &spu_full_list, full_list) |
| sysdev_remove_file(&spu->sysdev, attr); |
| |
| mutex_unlock(&spu_mutex); |
| } |
| EXPORT_SYMBOL_GPL(spu_remove_sysdev_attr); |
| |
| void spu_remove_sysdev_attr_group(struct attribute_group *attrs) |
| { |
| struct spu *spu; |
| mutex_lock(&spu_mutex); |
| |
| list_for_each_entry(spu, &spu_full_list, full_list) |
| sysfs_remove_group(&spu->sysdev.kobj, attrs); |
| |
| mutex_unlock(&spu_mutex); |
| } |
| EXPORT_SYMBOL_GPL(spu_remove_sysdev_attr_group); |
| |
| static int spu_create_sysdev(struct spu *spu) |
| { |
| int ret; |
| |
| spu->sysdev.id = spu->number; |
| spu->sysdev.cls = &spu_sysdev_class; |
| ret = sysdev_register(&spu->sysdev); |
| if (ret) { |
| printk(KERN_ERR "Can't register SPU %d with sysfs\n", |
| spu->number); |
| return ret; |
| } |
| |
| sysfs_add_device_to_node(&spu->sysdev, spu->node); |
| |
| return 0; |
| } |
| |
| static void spu_destroy_sysdev(struct spu *spu) |
| { |
| sysfs_remove_device_from_node(&spu->sysdev, spu->node); |
| sysdev_unregister(&spu->sysdev); |
| } |
| |
| static int __init create_spu(void *data) |
| { |
| struct spu *spu; |
| int ret; |
| static int number; |
| |
| ret = -ENOMEM; |
| spu = kzalloc(sizeof (*spu), GFP_KERNEL); |
| if (!spu) |
| goto out; |
| |
| spin_lock_init(&spu->register_lock); |
| mutex_lock(&spu_mutex); |
| spu->number = number++; |
| mutex_unlock(&spu_mutex); |
| |
| ret = spu_create_spu(spu, data); |
| |
| if (ret) |
| goto out_free; |
| |
| spu_mfc_sdr_setup(spu); |
| spu_mfc_sr1_set(spu, 0x33); |
| ret = spu_request_irqs(spu); |
| if (ret) |
| goto out_destroy; |
| |
| ret = spu_create_sysdev(spu); |
| if (ret) |
| goto out_free_irqs; |
| |
| mutex_lock(&spu_mutex); |
| list_add(&spu->list, &spu_list[spu->node]); |
| list_add(&spu->full_list, &spu_full_list); |
| mutex_unlock(&spu_mutex); |
| |
| goto out; |
| |
| out_free_irqs: |
| spu_free_irqs(spu); |
| out_destroy: |
| spu_destroy_spu(spu); |
| out_free: |
| kfree(spu); |
| out: |
| return ret; |
| } |
| |
| static void destroy_spu(struct spu *spu) |
| { |
| list_del_init(&spu->list); |
| list_del_init(&spu->full_list); |
| |
| spu_destroy_sysdev(spu); |
| spu_free_irqs(spu); |
| spu_destroy_spu(spu); |
| kfree(spu); |
| } |
| |
| static void cleanup_spu_base(void) |
| { |
| struct spu *spu, *tmp; |
| int node; |
| |
| mutex_lock(&spu_mutex); |
| for (node = 0; node < MAX_NUMNODES; node++) { |
| list_for_each_entry_safe(spu, tmp, &spu_list[node], list) |
| destroy_spu(spu); |
| } |
| mutex_unlock(&spu_mutex); |
| sysdev_class_unregister(&spu_sysdev_class); |
| } |
| module_exit(cleanup_spu_base); |
| |
| static int __init init_spu_base(void) |
| { |
| int i, ret; |
| |
| /* create sysdev class for spus */ |
| ret = sysdev_class_register(&spu_sysdev_class); |
| if (ret) |
| return ret; |
| |
| for (i = 0; i < MAX_NUMNODES; i++) |
| INIT_LIST_HEAD(&spu_list[i]); |
| |
| ret = spu_enumerate_spus(create_spu); |
| |
| if (ret) { |
| printk(KERN_WARNING "%s: Error initializing spus\n", |
| __FUNCTION__); |
| cleanup_spu_base(); |
| return ret; |
| } |
| |
| xmon_register_spus(&spu_full_list); |
| |
| return ret; |
| } |
| module_init(init_spu_base); |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>"); |