diff options
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/include/asm/powernv.h | 2 | ||||
| -rw-r--r-- | arch/powerpc/kernel/mce_power.c | 7 | ||||
| -rw-r--r-- | arch/powerpc/kernel/smp.c | 49 | ||||
| -rw-r--r-- | arch/powerpc/kvm/booke.c | 7 | ||||
| -rw-r--r-- | arch/powerpc/mm/mem.c | 2 | ||||
| -rw-r--r-- | arch/powerpc/platforms/powernv/memtrace.c | 17 | ||||
| -rw-r--r-- | arch/powerpc/platforms/powernv/npu-dma.c | 88 | ||||
| -rw-r--r-- | arch/powerpc/platforms/powernv/opal-rtc.c | 8 |
8 files changed, 132 insertions, 48 deletions
diff --git a/arch/powerpc/include/asm/powernv.h b/arch/powerpc/include/asm/powernv.h index d1c2d2e658cf..2f3ff7a27881 100644 --- a/arch/powerpc/include/asm/powernv.h +++ b/arch/powerpc/include/asm/powernv.h @@ -15,7 +15,7 @@ extern void powernv_set_nmmu_ptcr(unsigned long ptcr); extern struct npu_context *pnv_npu2_init_context(struct pci_dev *gpdev, unsigned long flags, - struct npu_context *(*cb)(struct npu_context *, void *), + void (*cb)(struct npu_context *, void *), void *priv); extern void pnv_npu2_destroy_context(struct npu_context *context, struct pci_dev *gpdev); diff --git a/arch/powerpc/kernel/mce_power.c b/arch/powerpc/kernel/mce_power.c index fe6fc63251fe..38c5b4764bfe 100644 --- a/arch/powerpc/kernel/mce_power.c +++ b/arch/powerpc/kernel/mce_power.c @@ -441,7 +441,6 @@ static int mce_handle_ierror(struct pt_regs *regs, if (pfn != ULONG_MAX) { *phys_addr = (pfn << PAGE_SHIFT); - handled = 1; } } } @@ -532,9 +531,7 @@ static int mce_handle_derror(struct pt_regs *regs, * kernel/exception-64s.h */ if (get_paca()->in_mce < MAX_MCE_DEPTH) - if (!mce_find_instr_ea_and_pfn(regs, addr, - phys_addr)) - handled = 1; + mce_find_instr_ea_and_pfn(regs, addr, phys_addr); } found = 1; } @@ -572,7 +569,7 @@ static long mce_handle_error(struct pt_regs *regs, const struct mce_ierror_table itable[]) { struct mce_error_info mce_err = { 0 }; - uint64_t addr, phys_addr; + uint64_t addr, phys_addr = ULONG_MAX; uint64_t srr1 = regs->msr; long handled; diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c index e16ec7b3b427..9ca7148b5881 100644 --- a/arch/powerpc/kernel/smp.c +++ b/arch/powerpc/kernel/smp.c @@ -566,10 +566,35 @@ void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *)) #endif #ifdef CONFIG_NMI_IPI -static void stop_this_cpu(struct pt_regs *regs) -#else +static void nmi_stop_this_cpu(struct pt_regs *regs) +{ + /* + * This is a special case because it never returns, so the NMI IPI + * handling would never mark it as done, which makes any later + * smp_send_nmi_ipi() call spin forever. Mark it done now. + * + * IRQs are already hard disabled by the smp_handle_nmi_ipi. + */ + nmi_ipi_lock(); + nmi_ipi_busy_count--; + nmi_ipi_unlock(); + + /* Remove this CPU */ + set_cpu_online(smp_processor_id(), false); + + spin_begin(); + while (1) + spin_cpu_relax(); +} + +void smp_send_stop(void) +{ + smp_send_nmi_ipi(NMI_IPI_ALL_OTHERS, nmi_stop_this_cpu, 1000000); +} + +#else /* CONFIG_NMI_IPI */ + static void stop_this_cpu(void *dummy) -#endif { /* Remove this CPU */ set_cpu_online(smp_processor_id(), false); @@ -582,12 +607,22 @@ static void stop_this_cpu(void *dummy) void smp_send_stop(void) { -#ifdef CONFIG_NMI_IPI - smp_send_nmi_ipi(NMI_IPI_ALL_OTHERS, stop_this_cpu, 1000000); -#else + static bool stopped = false; + + /* + * Prevent waiting on csd lock from a previous smp_send_stop. + * This is racy, but in general callers try to do the right + * thing and only fire off one smp_send_stop (e.g., see + * kernel/panic.c) + */ + if (stopped) + return; + + stopped = true; + smp_call_function(stop_this_cpu, NULL, 0); -#endif } +#endif /* CONFIG_NMI_IPI */ struct thread_info *current_set[NR_CPUS]; diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c index 6038e2e7aee0..876d4f294fdd 100644 --- a/arch/powerpc/kvm/booke.c +++ b/arch/powerpc/kvm/booke.c @@ -305,6 +305,13 @@ void kvmppc_core_queue_fpunavail(struct kvm_vcpu *vcpu) kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_FP_UNAVAIL); } +#ifdef CONFIG_ALTIVEC +void kvmppc_core_queue_vec_unavail(struct kvm_vcpu *vcpu) +{ + kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_ALTIVEC_UNAVAIL); +} +#endif + void kvmppc_core_queue_dec(struct kvm_vcpu *vcpu) { kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_DECREMENTER); diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c index 737f8a4632cc..c3c39b02b2ba 100644 --- a/arch/powerpc/mm/mem.c +++ b/arch/powerpc/mm/mem.c @@ -133,6 +133,7 @@ int __meminit arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap * start, start + size, rc); return -EFAULT; } + flush_inval_dcache_range(start, start + size); return __add_pages(nid, start_pfn, nr_pages, altmap, want_memblock); } @@ -159,6 +160,7 @@ int __meminit arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap /* Remove htab bolted mappings for this section of memory */ start = (unsigned long)__va(start); + flush_inval_dcache_range(start, start + size); ret = remove_section_mapping(start, start + size); /* Ensure all vmalloc mappings are flushed in case they also diff --git a/arch/powerpc/platforms/powernv/memtrace.c b/arch/powerpc/platforms/powernv/memtrace.c index de470caf0784..fc222a0c2ac4 100644 --- a/arch/powerpc/platforms/powernv/memtrace.c +++ b/arch/powerpc/platforms/powernv/memtrace.c @@ -82,19 +82,6 @@ static const struct file_operations memtrace_fops = { .open = simple_open, }; -static void flush_memory_region(u64 base, u64 size) -{ - unsigned long line_size = ppc64_caches.l1d.size; - u64 end = base + size; - u64 addr; - - base = round_down(base, line_size); - end = round_up(end, line_size); - - for (addr = base; addr < end; addr += line_size) - asm volatile("dcbf 0,%0" : "=r" (addr) :: "memory"); -} - static int check_memblock_online(struct memory_block *mem, void *arg) { if (mem->state != MEM_ONLINE) @@ -132,10 +119,6 @@ static bool memtrace_offline_pages(u32 nid, u64 start_pfn, u64 nr_pages) walk_memory_range(start_pfn, end_pfn, (void *)MEM_OFFLINE, change_memblock_state); - /* RCU grace period? */ - flush_memory_region((u64)__va(start_pfn << PAGE_SHIFT), - nr_pages << PAGE_SHIFT); - lock_device_hotplug(); remove_memory(nid, start_pfn << PAGE_SHIFT, nr_pages << PAGE_SHIFT); unlock_device_hotplug(); diff --git a/arch/powerpc/platforms/powernv/npu-dma.c b/arch/powerpc/platforms/powernv/npu-dma.c index 69a4f9e8bd55..525e966dce34 100644 --- a/arch/powerpc/platforms/powernv/npu-dma.c +++ b/arch/powerpc/platforms/powernv/npu-dma.c @@ -34,6 +34,19 @@ #define npu_to_phb(x) container_of(x, struct pnv_phb, npu) /* + * spinlock to protect initialisation of an npu_context for a particular + * mm_struct. + */ +static DEFINE_SPINLOCK(npu_context_lock); + +/* + * When an address shootdown range exceeds this threshold we invalidate the + * entire TLB on the GPU for the given PID rather than each specific address in + * the range. + */ +#define ATSD_THRESHOLD (2*1024*1024) + +/* * Other types of TCE cache invalidation are not functional in the * hardware. */ @@ -401,7 +414,7 @@ struct npu_context { bool nmmu_flush; /* Callback to stop translation requests on a given GPU */ - struct npu_context *(*release_cb)(struct npu_context *, void *); + void (*release_cb)(struct npu_context *context, void *priv); /* * Private pointer passed to the above callback for usage by @@ -671,11 +684,19 @@ static void pnv_npu2_mn_invalidate_range(struct mmu_notifier *mn, struct npu_context *npu_context = mn_to_npu_context(mn); unsigned long address; - for (address = start; address < end; address += PAGE_SIZE) - mmio_invalidate(npu_context, 1, address, false); + if (end - start > ATSD_THRESHOLD) { + /* + * Just invalidate the entire PID if the address range is too + * large. + */ + mmio_invalidate(npu_context, 0, 0, true); + } else { + for (address = start; address < end; address += PAGE_SIZE) + mmio_invalidate(npu_context, 1, address, false); - /* Do the flush only on the final addess == end */ - mmio_invalidate(npu_context, 1, address, true); + /* Do the flush only on the final addess == end */ + mmio_invalidate(npu_context, 1, address, true); + } } static const struct mmu_notifier_ops nv_nmmu_notifier_ops = { @@ -696,11 +717,12 @@ static const struct mmu_notifier_ops nv_nmmu_notifier_ops = { * Returns an error if there no contexts are currently available or a * npu_context which should be passed to pnv_npu2_handle_fault(). * - * mmap_sem must be held in write mode. + * mmap_sem must be held in write mode and must not be called from interrupt + * context. */ struct npu_context *pnv_npu2_init_context(struct pci_dev *gpdev, unsigned long flags, - struct npu_context *(*cb)(struct npu_context *, void *), + void (*cb)(struct npu_context *, void *), void *priv) { int rc; @@ -743,7 +765,9 @@ struct npu_context *pnv_npu2_init_context(struct pci_dev *gpdev, /* * Setup the NPU context table for a particular GPU. These need to be * per-GPU as we need the tables to filter ATSDs when there are no - * active contexts on a particular GPU. + * active contexts on a particular GPU. It is safe for these to be + * called concurrently with destroy as the OPAL call takes appropriate + * locks and refcounts on init/destroy. */ rc = opal_npu_init_context(nphb->opal_id, mm->context.id, flags, PCI_DEVID(gpdev->bus->number, gpdev->devfn)); @@ -754,8 +778,29 @@ struct npu_context *pnv_npu2_init_context(struct pci_dev *gpdev, * We store the npu pci device so we can more easily get at the * associated npus. */ + spin_lock(&npu_context_lock); npu_context = mm->context.npu_context; + if (npu_context) { + if (npu_context->release_cb != cb || + npu_context->priv != priv) { + spin_unlock(&npu_context_lock); + opal_npu_destroy_context(nphb->opal_id, mm->context.id, + PCI_DEVID(gpdev->bus->number, + gpdev->devfn)); + return ERR_PTR(-EINVAL); + } + + WARN_ON(!kref_get_unless_zero(&npu_context->kref)); + } + spin_unlock(&npu_context_lock); + if (!npu_context) { + /* + * We can set up these fields without holding the + * npu_context_lock as the npu_context hasn't been returned to + * the caller meaning it can't be destroyed. Parallel allocation + * is protected against by mmap_sem. + */ rc = -ENOMEM; npu_context = kzalloc(sizeof(struct npu_context), GFP_KERNEL); if (npu_context) { @@ -774,8 +819,6 @@ struct npu_context *pnv_npu2_init_context(struct pci_dev *gpdev, } mm->context.npu_context = npu_context; - } else { - WARN_ON(!kref_get_unless_zero(&npu_context->kref)); } npu_context->release_cb = cb; @@ -814,15 +857,16 @@ static void pnv_npu2_release_context(struct kref *kref) mm_context_remove_copro(npu_context->mm); npu_context->mm->context.npu_context = NULL; - mmu_notifier_unregister(&npu_context->mn, - npu_context->mm); - - kfree(npu_context); } +/* + * Destroy a context on the given GPU. May free the npu_context if it is no + * longer active on any GPUs. Must not be called from interrupt context. + */ void pnv_npu2_destroy_context(struct npu_context *npu_context, struct pci_dev *gpdev) { + int removed; struct pnv_phb *nphb; struct npu *npu; struct pci_dev *npdev = pnv_pci_get_npu_dev(gpdev, 0); @@ -844,7 +888,21 @@ void pnv_npu2_destroy_context(struct npu_context *npu_context, WRITE_ONCE(npu_context->npdev[npu->index][nvlink_index], NULL); opal_npu_destroy_context(nphb->opal_id, npu_context->mm->context.id, PCI_DEVID(gpdev->bus->number, gpdev->devfn)); - kref_put(&npu_context->kref, pnv_npu2_release_context); + spin_lock(&npu_context_lock); + removed = kref_put(&npu_context->kref, pnv_npu2_release_context); + spin_unlock(&npu_context_lock); + + /* + * We need to do this outside of pnv_npu2_release_context so that it is + * outside the spinlock as mmu_notifier_destroy uses SRCU. + */ + if (removed) { + mmu_notifier_unregister(&npu_context->mn, + npu_context->mm); + + kfree(npu_context); + } + } EXPORT_SYMBOL(pnv_npu2_destroy_context); diff --git a/arch/powerpc/platforms/powernv/opal-rtc.c b/arch/powerpc/platforms/powernv/opal-rtc.c index f8868864f373..aa2a5139462e 100644 --- a/arch/powerpc/platforms/powernv/opal-rtc.c +++ b/arch/powerpc/platforms/powernv/opal-rtc.c @@ -48,10 +48,12 @@ unsigned long __init opal_get_boot_time(void) while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { rc = opal_rtc_read(&__y_m_d, &__h_m_s_ms); - if (rc == OPAL_BUSY_EVENT) + if (rc == OPAL_BUSY_EVENT) { + mdelay(OPAL_BUSY_DELAY_MS); opal_poll_events(NULL); - else if (rc == OPAL_BUSY) - mdelay(10); + } else if (rc == OPAL_BUSY) { + mdelay(OPAL_BUSY_DELAY_MS); + } } if (rc != OPAL_SUCCESS) return 0; |