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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /arch/powerpc/platforms/pseries/lpar.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/powerpc/platforms/pseries/lpar.c')
-rw-r--r--arch/powerpc/platforms/pseries/lpar.c2044
1 files changed, 2044 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/pseries/lpar.c b/arch/powerpc/platforms/pseries/lpar.c
new file mode 100644
index 000000000..541199c6a
--- /dev/null
+++ b/arch/powerpc/platforms/pseries/lpar.c
@@ -0,0 +1,2044 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * pSeries_lpar.c
+ * Copyright (C) 2001 Todd Inglett, IBM Corporation
+ *
+ * pSeries LPAR support.
+ */
+
+/* Enables debugging of low-level hash table routines - careful! */
+#undef DEBUG
+#define pr_fmt(fmt) "lpar: " fmt
+
+#include <linux/kernel.h>
+#include <linux/dma-mapping.h>
+#include <linux/console.h>
+#include <linux/export.h>
+#include <linux/jump_label.h>
+#include <linux/delay.h>
+#include <linux/stop_machine.h>
+#include <linux/spinlock.h>
+#include <linux/cpuhotplug.h>
+#include <linux/workqueue.h>
+#include <linux/proc_fs.h>
+#include <linux/pgtable.h>
+#include <linux/debugfs.h>
+
+#include <asm/processor.h>
+#include <asm/mmu.h>
+#include <asm/page.h>
+#include <asm/setup.h>
+#include <asm/mmu_context.h>
+#include <asm/iommu.h>
+#include <asm/tlb.h>
+#include <asm/cputable.h>
+#include <asm/udbg.h>
+#include <asm/smp.h>
+#include <asm/trace.h>
+#include <asm/firmware.h>
+#include <asm/plpar_wrappers.h>
+#include <asm/kexec.h>
+#include <asm/fadump.h>
+#include <asm/dtl.h>
+
+#include "pseries.h"
+
+/* Flag bits for H_BULK_REMOVE */
+#define HBR_REQUEST 0x4000000000000000UL
+#define HBR_RESPONSE 0x8000000000000000UL
+#define HBR_END 0xc000000000000000UL
+#define HBR_AVPN 0x0200000000000000UL
+#define HBR_ANDCOND 0x0100000000000000UL
+
+
+/* in hvCall.S */
+EXPORT_SYMBOL(plpar_hcall);
+EXPORT_SYMBOL(plpar_hcall9);
+EXPORT_SYMBOL(plpar_hcall_norets);
+
+#ifdef CONFIG_PPC_64S_HASH_MMU
+/*
+ * H_BLOCK_REMOVE supported block size for this page size in segment who's base
+ * page size is that page size.
+ *
+ * The first index is the segment base page size, the second one is the actual
+ * page size.
+ */
+static int hblkrm_size[MMU_PAGE_COUNT][MMU_PAGE_COUNT] __ro_after_init;
+#endif
+
+/*
+ * Due to the involved complexity, and that the current hypervisor is only
+ * returning this value or 0, we are limiting the support of the H_BLOCK_REMOVE
+ * buffer size to 8 size block.
+ */
+#define HBLKRM_SUPPORTED_BLOCK_SIZE 8
+
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
+static u8 dtl_mask = DTL_LOG_PREEMPT;
+#else
+static u8 dtl_mask;
+#endif
+
+void alloc_dtl_buffers(unsigned long *time_limit)
+{
+ int cpu;
+ struct paca_struct *pp;
+ struct dtl_entry *dtl;
+
+ for_each_possible_cpu(cpu) {
+ pp = paca_ptrs[cpu];
+ if (pp->dispatch_log)
+ continue;
+ dtl = kmem_cache_alloc(dtl_cache, GFP_KERNEL);
+ if (!dtl) {
+ pr_warn("Failed to allocate dispatch trace log for cpu %d\n",
+ cpu);
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
+ pr_warn("Stolen time statistics will be unreliable\n");
+#endif
+ break;
+ }
+
+ pp->dtl_ridx = 0;
+ pp->dispatch_log = dtl;
+ pp->dispatch_log_end = dtl + N_DISPATCH_LOG;
+ pp->dtl_curr = dtl;
+
+ if (time_limit && time_after(jiffies, *time_limit)) {
+ cond_resched();
+ *time_limit = jiffies + HZ;
+ }
+ }
+}
+
+void register_dtl_buffer(int cpu)
+{
+ long ret;
+ struct paca_struct *pp;
+ struct dtl_entry *dtl;
+ int hwcpu = get_hard_smp_processor_id(cpu);
+
+ pp = paca_ptrs[cpu];
+ dtl = pp->dispatch_log;
+ if (dtl && dtl_mask) {
+ pp->dtl_ridx = 0;
+ pp->dtl_curr = dtl;
+ lppaca_of(cpu).dtl_idx = 0;
+
+ /* hypervisor reads buffer length from this field */
+ dtl->enqueue_to_dispatch_time = cpu_to_be32(DISPATCH_LOG_BYTES);
+ ret = register_dtl(hwcpu, __pa(dtl));
+ if (ret)
+ pr_err("WARNING: DTL registration of cpu %d (hw %d) failed with %ld\n",
+ cpu, hwcpu, ret);
+
+ lppaca_of(cpu).dtl_enable_mask = dtl_mask;
+ }
+}
+
+#ifdef CONFIG_PPC_SPLPAR
+struct dtl_worker {
+ struct delayed_work work;
+ int cpu;
+};
+
+struct vcpu_dispatch_data {
+ int last_disp_cpu;
+
+ int total_disp;
+
+ int same_cpu_disp;
+ int same_chip_disp;
+ int diff_chip_disp;
+ int far_chip_disp;
+
+ int numa_home_disp;
+ int numa_remote_disp;
+ int numa_far_disp;
+};
+
+/*
+ * This represents the number of cpus in the hypervisor. Since there is no
+ * architected way to discover the number of processors in the host, we
+ * provision for dealing with NR_CPUS. This is currently 2048 by default, and
+ * is sufficient for our purposes. This will need to be tweaked if
+ * CONFIG_NR_CPUS is changed.
+ */
+#define NR_CPUS_H NR_CPUS
+
+DEFINE_RWLOCK(dtl_access_lock);
+static DEFINE_PER_CPU(struct vcpu_dispatch_data, vcpu_disp_data);
+static DEFINE_PER_CPU(u64, dtl_entry_ridx);
+static DEFINE_PER_CPU(struct dtl_worker, dtl_workers);
+static enum cpuhp_state dtl_worker_state;
+static DEFINE_MUTEX(dtl_enable_mutex);
+static int vcpudispatch_stats_on __read_mostly;
+static int vcpudispatch_stats_freq = 50;
+static __be32 *vcpu_associativity, *pcpu_associativity;
+
+
+static void free_dtl_buffers(unsigned long *time_limit)
+{
+#ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
+ int cpu;
+ struct paca_struct *pp;
+
+ for_each_possible_cpu(cpu) {
+ pp = paca_ptrs[cpu];
+ if (!pp->dispatch_log)
+ continue;
+ kmem_cache_free(dtl_cache, pp->dispatch_log);
+ pp->dtl_ridx = 0;
+ pp->dispatch_log = 0;
+ pp->dispatch_log_end = 0;
+ pp->dtl_curr = 0;
+
+ if (time_limit && time_after(jiffies, *time_limit)) {
+ cond_resched();
+ *time_limit = jiffies + HZ;
+ }
+ }
+#endif
+}
+
+static int init_cpu_associativity(void)
+{
+ vcpu_associativity = kcalloc(num_possible_cpus() / threads_per_core,
+ VPHN_ASSOC_BUFSIZE * sizeof(__be32), GFP_KERNEL);
+ pcpu_associativity = kcalloc(NR_CPUS_H / threads_per_core,
+ VPHN_ASSOC_BUFSIZE * sizeof(__be32), GFP_KERNEL);
+
+ if (!vcpu_associativity || !pcpu_associativity) {
+ pr_err("error allocating memory for associativity information\n");
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+static void destroy_cpu_associativity(void)
+{
+ kfree(vcpu_associativity);
+ kfree(pcpu_associativity);
+ vcpu_associativity = pcpu_associativity = 0;
+}
+
+static __be32 *__get_cpu_associativity(int cpu, __be32 *cpu_assoc, int flag)
+{
+ __be32 *assoc;
+ int rc = 0;
+
+ assoc = &cpu_assoc[(int)(cpu / threads_per_core) * VPHN_ASSOC_BUFSIZE];
+ if (!assoc[0]) {
+ rc = hcall_vphn(cpu, flag, &assoc[0]);
+ if (rc)
+ return NULL;
+ }
+
+ return assoc;
+}
+
+static __be32 *get_pcpu_associativity(int cpu)
+{
+ return __get_cpu_associativity(cpu, pcpu_associativity, VPHN_FLAG_PCPU);
+}
+
+static __be32 *get_vcpu_associativity(int cpu)
+{
+ return __get_cpu_associativity(cpu, vcpu_associativity, VPHN_FLAG_VCPU);
+}
+
+static int cpu_relative_dispatch_distance(int last_disp_cpu, int cur_disp_cpu)
+{
+ __be32 *last_disp_cpu_assoc, *cur_disp_cpu_assoc;
+
+ if (last_disp_cpu >= NR_CPUS_H || cur_disp_cpu >= NR_CPUS_H)
+ return -EINVAL;
+
+ last_disp_cpu_assoc = get_pcpu_associativity(last_disp_cpu);
+ cur_disp_cpu_assoc = get_pcpu_associativity(cur_disp_cpu);
+
+ if (!last_disp_cpu_assoc || !cur_disp_cpu_assoc)
+ return -EIO;
+
+ return cpu_relative_distance(last_disp_cpu_assoc, cur_disp_cpu_assoc);
+}
+
+static int cpu_home_node_dispatch_distance(int disp_cpu)
+{
+ __be32 *disp_cpu_assoc, *vcpu_assoc;
+ int vcpu_id = smp_processor_id();
+
+ if (disp_cpu >= NR_CPUS_H) {
+ pr_debug_ratelimited("vcpu dispatch cpu %d > %d\n",
+ disp_cpu, NR_CPUS_H);
+ return -EINVAL;
+ }
+
+ disp_cpu_assoc = get_pcpu_associativity(disp_cpu);
+ vcpu_assoc = get_vcpu_associativity(vcpu_id);
+
+ if (!disp_cpu_assoc || !vcpu_assoc)
+ return -EIO;
+
+ return cpu_relative_distance(disp_cpu_assoc, vcpu_assoc);
+}
+
+static void update_vcpu_disp_stat(int disp_cpu)
+{
+ struct vcpu_dispatch_data *disp;
+ int distance;
+
+ disp = this_cpu_ptr(&vcpu_disp_data);
+ if (disp->last_disp_cpu == -1) {
+ disp->last_disp_cpu = disp_cpu;
+ return;
+ }
+
+ disp->total_disp++;
+
+ if (disp->last_disp_cpu == disp_cpu ||
+ (cpu_first_thread_sibling(disp->last_disp_cpu) ==
+ cpu_first_thread_sibling(disp_cpu)))
+ disp->same_cpu_disp++;
+ else {
+ distance = cpu_relative_dispatch_distance(disp->last_disp_cpu,
+ disp_cpu);
+ if (distance < 0)
+ pr_debug_ratelimited("vcpudispatch_stats: cpu %d: error determining associativity\n",
+ smp_processor_id());
+ else {
+ switch (distance) {
+ case 0:
+ disp->same_chip_disp++;
+ break;
+ case 1:
+ disp->diff_chip_disp++;
+ break;
+ case 2:
+ disp->far_chip_disp++;
+ break;
+ default:
+ pr_debug_ratelimited("vcpudispatch_stats: cpu %d (%d -> %d): unexpected relative dispatch distance %d\n",
+ smp_processor_id(),
+ disp->last_disp_cpu,
+ disp_cpu,
+ distance);
+ }
+ }
+ }
+
+ distance = cpu_home_node_dispatch_distance(disp_cpu);
+ if (distance < 0)
+ pr_debug_ratelimited("vcpudispatch_stats: cpu %d: error determining associativity\n",
+ smp_processor_id());
+ else {
+ switch (distance) {
+ case 0:
+ disp->numa_home_disp++;
+ break;
+ case 1:
+ disp->numa_remote_disp++;
+ break;
+ case 2:
+ disp->numa_far_disp++;
+ break;
+ default:
+ pr_debug_ratelimited("vcpudispatch_stats: cpu %d on %d: unexpected numa dispatch distance %d\n",
+ smp_processor_id(),
+ disp_cpu,
+ distance);
+ }
+ }
+
+ disp->last_disp_cpu = disp_cpu;
+}
+
+static void process_dtl_buffer(struct work_struct *work)
+{
+ struct dtl_entry dtle;
+ u64 i = __this_cpu_read(dtl_entry_ridx);
+ struct dtl_entry *dtl = local_paca->dispatch_log + (i % N_DISPATCH_LOG);
+ struct dtl_entry *dtl_end = local_paca->dispatch_log_end;
+ struct lppaca *vpa = local_paca->lppaca_ptr;
+ struct dtl_worker *d = container_of(work, struct dtl_worker, work.work);
+
+ if (!local_paca->dispatch_log)
+ return;
+
+ /* if we have been migrated away, we cancel ourself */
+ if (d->cpu != smp_processor_id()) {
+ pr_debug("vcpudispatch_stats: cpu %d worker migrated -- canceling worker\n",
+ smp_processor_id());
+ return;
+ }
+
+ if (i == be64_to_cpu(vpa->dtl_idx))
+ goto out;
+
+ while (i < be64_to_cpu(vpa->dtl_idx)) {
+ dtle = *dtl;
+ barrier();
+ if (i + N_DISPATCH_LOG < be64_to_cpu(vpa->dtl_idx)) {
+ /* buffer has overflowed */
+ pr_debug_ratelimited("vcpudispatch_stats: cpu %d lost %lld DTL samples\n",
+ d->cpu,
+ be64_to_cpu(vpa->dtl_idx) - N_DISPATCH_LOG - i);
+ i = be64_to_cpu(vpa->dtl_idx) - N_DISPATCH_LOG;
+ dtl = local_paca->dispatch_log + (i % N_DISPATCH_LOG);
+ continue;
+ }
+ update_vcpu_disp_stat(be16_to_cpu(dtle.processor_id));
+ ++i;
+ ++dtl;
+ if (dtl == dtl_end)
+ dtl = local_paca->dispatch_log;
+ }
+
+ __this_cpu_write(dtl_entry_ridx, i);
+
+out:
+ schedule_delayed_work_on(d->cpu, to_delayed_work(work),
+ HZ / vcpudispatch_stats_freq);
+}
+
+static int dtl_worker_online(unsigned int cpu)
+{
+ struct dtl_worker *d = &per_cpu(dtl_workers, cpu);
+
+ memset(d, 0, sizeof(*d));
+ INIT_DELAYED_WORK(&d->work, process_dtl_buffer);
+ d->cpu = cpu;
+
+#ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
+ per_cpu(dtl_entry_ridx, cpu) = 0;
+ register_dtl_buffer(cpu);
+#else
+ per_cpu(dtl_entry_ridx, cpu) = be64_to_cpu(lppaca_of(cpu).dtl_idx);
+#endif
+
+ schedule_delayed_work_on(cpu, &d->work, HZ / vcpudispatch_stats_freq);
+ return 0;
+}
+
+static int dtl_worker_offline(unsigned int cpu)
+{
+ struct dtl_worker *d = &per_cpu(dtl_workers, cpu);
+
+ cancel_delayed_work_sync(&d->work);
+
+#ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
+ unregister_dtl(get_hard_smp_processor_id(cpu));
+#endif
+
+ return 0;
+}
+
+static void set_global_dtl_mask(u8 mask)
+{
+ int cpu;
+
+ dtl_mask = mask;
+ for_each_present_cpu(cpu)
+ lppaca_of(cpu).dtl_enable_mask = dtl_mask;
+}
+
+static void reset_global_dtl_mask(void)
+{
+ int cpu;
+
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
+ dtl_mask = DTL_LOG_PREEMPT;
+#else
+ dtl_mask = 0;
+#endif
+ for_each_present_cpu(cpu)
+ lppaca_of(cpu).dtl_enable_mask = dtl_mask;
+}
+
+static int dtl_worker_enable(unsigned long *time_limit)
+{
+ int rc = 0, state;
+
+ if (!write_trylock(&dtl_access_lock)) {
+ rc = -EBUSY;
+ goto out;
+ }
+
+ set_global_dtl_mask(DTL_LOG_ALL);
+
+ /* Setup dtl buffers and register those */
+ alloc_dtl_buffers(time_limit);
+
+ state = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "powerpc/dtl:online",
+ dtl_worker_online, dtl_worker_offline);
+ if (state < 0) {
+ pr_err("vcpudispatch_stats: unable to setup workqueue for DTL processing\n");
+ free_dtl_buffers(time_limit);
+ reset_global_dtl_mask();
+ write_unlock(&dtl_access_lock);
+ rc = -EINVAL;
+ goto out;
+ }
+ dtl_worker_state = state;
+
+out:
+ return rc;
+}
+
+static void dtl_worker_disable(unsigned long *time_limit)
+{
+ cpuhp_remove_state(dtl_worker_state);
+ free_dtl_buffers(time_limit);
+ reset_global_dtl_mask();
+ write_unlock(&dtl_access_lock);
+}
+
+static ssize_t vcpudispatch_stats_write(struct file *file, const char __user *p,
+ size_t count, loff_t *ppos)
+{
+ unsigned long time_limit = jiffies + HZ;
+ struct vcpu_dispatch_data *disp;
+ int rc, cmd, cpu;
+ char buf[16];
+
+ if (count > 15)
+ return -EINVAL;
+
+ if (copy_from_user(buf, p, count))
+ return -EFAULT;
+
+ buf[count] = 0;
+ rc = kstrtoint(buf, 0, &cmd);
+ if (rc || cmd < 0 || cmd > 1) {
+ pr_err("vcpudispatch_stats: please use 0 to disable or 1 to enable dispatch statistics\n");
+ return rc ? rc : -EINVAL;
+ }
+
+ mutex_lock(&dtl_enable_mutex);
+
+ if ((cmd == 0 && !vcpudispatch_stats_on) ||
+ (cmd == 1 && vcpudispatch_stats_on))
+ goto out;
+
+ if (cmd) {
+ rc = init_cpu_associativity();
+ if (rc) {
+ destroy_cpu_associativity();
+ goto out;
+ }
+
+ for_each_possible_cpu(cpu) {
+ disp = per_cpu_ptr(&vcpu_disp_data, cpu);
+ memset(disp, 0, sizeof(*disp));
+ disp->last_disp_cpu = -1;
+ }
+
+ rc = dtl_worker_enable(&time_limit);
+ if (rc) {
+ destroy_cpu_associativity();
+ goto out;
+ }
+ } else {
+ dtl_worker_disable(&time_limit);
+ destroy_cpu_associativity();
+ }
+
+ vcpudispatch_stats_on = cmd;
+
+out:
+ mutex_unlock(&dtl_enable_mutex);
+ if (rc)
+ return rc;
+ return count;
+}
+
+static int vcpudispatch_stats_display(struct seq_file *p, void *v)
+{
+ int cpu;
+ struct vcpu_dispatch_data *disp;
+
+ if (!vcpudispatch_stats_on) {
+ seq_puts(p, "off\n");
+ return 0;
+ }
+
+ for_each_online_cpu(cpu) {
+ disp = per_cpu_ptr(&vcpu_disp_data, cpu);
+ seq_printf(p, "cpu%d", cpu);
+ seq_put_decimal_ull(p, " ", disp->total_disp);
+ seq_put_decimal_ull(p, " ", disp->same_cpu_disp);
+ seq_put_decimal_ull(p, " ", disp->same_chip_disp);
+ seq_put_decimal_ull(p, " ", disp->diff_chip_disp);
+ seq_put_decimal_ull(p, " ", disp->far_chip_disp);
+ seq_put_decimal_ull(p, " ", disp->numa_home_disp);
+ seq_put_decimal_ull(p, " ", disp->numa_remote_disp);
+ seq_put_decimal_ull(p, " ", disp->numa_far_disp);
+ seq_puts(p, "\n");
+ }
+
+ return 0;
+}
+
+static int vcpudispatch_stats_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, vcpudispatch_stats_display, NULL);
+}
+
+static const struct proc_ops vcpudispatch_stats_proc_ops = {
+ .proc_open = vcpudispatch_stats_open,
+ .proc_read = seq_read,
+ .proc_write = vcpudispatch_stats_write,
+ .proc_lseek = seq_lseek,
+ .proc_release = single_release,
+};
+
+static ssize_t vcpudispatch_stats_freq_write(struct file *file,
+ const char __user *p, size_t count, loff_t *ppos)
+{
+ int rc, freq;
+ char buf[16];
+
+ if (count > 15)
+ return -EINVAL;
+
+ if (copy_from_user(buf, p, count))
+ return -EFAULT;
+
+ buf[count] = 0;
+ rc = kstrtoint(buf, 0, &freq);
+ if (rc || freq < 1 || freq > HZ) {
+ pr_err("vcpudispatch_stats_freq: please specify a frequency between 1 and %d\n",
+ HZ);
+ return rc ? rc : -EINVAL;
+ }
+
+ vcpudispatch_stats_freq = freq;
+
+ return count;
+}
+
+static int vcpudispatch_stats_freq_display(struct seq_file *p, void *v)
+{
+ seq_printf(p, "%d\n", vcpudispatch_stats_freq);
+ return 0;
+}
+
+static int vcpudispatch_stats_freq_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, vcpudispatch_stats_freq_display, NULL);
+}
+
+static const struct proc_ops vcpudispatch_stats_freq_proc_ops = {
+ .proc_open = vcpudispatch_stats_freq_open,
+ .proc_read = seq_read,
+ .proc_write = vcpudispatch_stats_freq_write,
+ .proc_lseek = seq_lseek,
+ .proc_release = single_release,
+};
+
+static int __init vcpudispatch_stats_procfs_init(void)
+{
+ if (!lppaca_shared_proc())
+ return 0;
+
+ if (!proc_create("powerpc/vcpudispatch_stats", 0600, NULL,
+ &vcpudispatch_stats_proc_ops))
+ pr_err("vcpudispatch_stats: error creating procfs file\n");
+ else if (!proc_create("powerpc/vcpudispatch_stats_freq", 0600, NULL,
+ &vcpudispatch_stats_freq_proc_ops))
+ pr_err("vcpudispatch_stats_freq: error creating procfs file\n");
+
+ return 0;
+}
+
+machine_device_initcall(pseries, vcpudispatch_stats_procfs_init);
+
+#ifdef CONFIG_PARAVIRT_TIME_ACCOUNTING
+u64 pseries_paravirt_steal_clock(int cpu)
+{
+ struct lppaca *lppaca = &lppaca_of(cpu);
+
+ return be64_to_cpu(READ_ONCE(lppaca->enqueue_dispatch_tb)) +
+ be64_to_cpu(READ_ONCE(lppaca->ready_enqueue_tb));
+}
+#endif
+
+#endif /* CONFIG_PPC_SPLPAR */
+
+void vpa_init(int cpu)
+{
+ int hwcpu = get_hard_smp_processor_id(cpu);
+ unsigned long addr;
+ long ret;
+
+ /*
+ * The spec says it "may be problematic" if CPU x registers the VPA of
+ * CPU y. We should never do that, but wail if we ever do.
+ */
+ WARN_ON(cpu != smp_processor_id());
+
+ if (cpu_has_feature(CPU_FTR_ALTIVEC))
+ lppaca_of(cpu).vmxregs_in_use = 1;
+
+ if (cpu_has_feature(CPU_FTR_ARCH_207S))
+ lppaca_of(cpu).ebb_regs_in_use = 1;
+
+ addr = __pa(&lppaca_of(cpu));
+ ret = register_vpa(hwcpu, addr);
+
+ if (ret) {
+ pr_err("WARNING: VPA registration for cpu %d (hw %d) of area "
+ "%lx failed with %ld\n", cpu, hwcpu, addr, ret);
+ return;
+ }
+
+#ifdef CONFIG_PPC_64S_HASH_MMU
+ /*
+ * PAPR says this feature is SLB-Buffer but firmware never
+ * reports that. All SPLPAR support SLB shadow buffer.
+ */
+ if (!radix_enabled() && firmware_has_feature(FW_FEATURE_SPLPAR)) {
+ addr = __pa(paca_ptrs[cpu]->slb_shadow_ptr);
+ ret = register_slb_shadow(hwcpu, addr);
+ if (ret)
+ pr_err("WARNING: SLB shadow buffer registration for "
+ "cpu %d (hw %d) of area %lx failed with %ld\n",
+ cpu, hwcpu, addr, ret);
+ }
+#endif /* CONFIG_PPC_64S_HASH_MMU */
+
+ /*
+ * Register dispatch trace log, if one has been allocated.
+ */
+ register_dtl_buffer(cpu);
+}
+
+#ifdef CONFIG_PPC_BOOK3S_64
+
+static int __init pseries_lpar_register_process_table(unsigned long base,
+ unsigned long page_size, unsigned long table_size)
+{
+ long rc;
+ unsigned long flags = 0;
+
+ if (table_size)
+ flags |= PROC_TABLE_NEW;
+ if (radix_enabled()) {
+ flags |= PROC_TABLE_RADIX;
+ if (mmu_has_feature(MMU_FTR_GTSE))
+ flags |= PROC_TABLE_GTSE;
+ } else
+ flags |= PROC_TABLE_HPT_SLB;
+ for (;;) {
+ rc = plpar_hcall_norets(H_REGISTER_PROC_TBL, flags, base,
+ page_size, table_size);
+ if (!H_IS_LONG_BUSY(rc))
+ break;
+ mdelay(get_longbusy_msecs(rc));
+ }
+ if (rc != H_SUCCESS) {
+ pr_err("Failed to register process table (rc=%ld)\n", rc);
+ BUG();
+ }
+ return rc;
+}
+
+#ifdef CONFIG_PPC_64S_HASH_MMU
+
+static long pSeries_lpar_hpte_insert(unsigned long hpte_group,
+ unsigned long vpn, unsigned long pa,
+ unsigned long rflags, unsigned long vflags,
+ int psize, int apsize, int ssize)
+{
+ unsigned long lpar_rc;
+ unsigned long flags;
+ unsigned long slot;
+ unsigned long hpte_v, hpte_r;
+
+ if (!(vflags & HPTE_V_BOLTED))
+ pr_devel("hpte_insert(group=%lx, vpn=%016lx, "
+ "pa=%016lx, rflags=%lx, vflags=%lx, psize=%d)\n",
+ hpte_group, vpn, pa, rflags, vflags, psize);
+
+ hpte_v = hpte_encode_v(vpn, psize, apsize, ssize) | vflags | HPTE_V_VALID;
+ hpte_r = hpte_encode_r(pa, psize, apsize) | rflags;
+
+ if (!(vflags & HPTE_V_BOLTED))
+ pr_devel(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r);
+
+ /* Now fill in the actual HPTE */
+ /* Set CEC cookie to 0 */
+ /* Zero page = 0 */
+ /* I-cache Invalidate = 0 */
+ /* I-cache synchronize = 0 */
+ /* Exact = 0 */
+ flags = 0;
+
+ if (firmware_has_feature(FW_FEATURE_XCMO) && !(hpte_r & HPTE_R_N))
+ flags |= H_COALESCE_CAND;
+
+ lpar_rc = plpar_pte_enter(flags, hpte_group, hpte_v, hpte_r, &slot);
+ if (unlikely(lpar_rc == H_PTEG_FULL)) {
+ pr_devel("Hash table group is full\n");
+ return -1;
+ }
+
+ /*
+ * Since we try and ioremap PHBs we don't own, the pte insert
+ * will fail. However we must catch the failure in hash_page
+ * or we will loop forever, so return -2 in this case.
+ */
+ if (unlikely(lpar_rc != H_SUCCESS)) {
+ pr_err("Failed hash pte insert with error %ld\n", lpar_rc);
+ return -2;
+ }
+ if (!(vflags & HPTE_V_BOLTED))
+ pr_devel(" -> slot: %lu\n", slot & 7);
+
+ /* Because of iSeries, we have to pass down the secondary
+ * bucket bit here as well
+ */
+ return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3);
+}
+
+static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock);
+
+static long pSeries_lpar_hpte_remove(unsigned long hpte_group)
+{
+ unsigned long slot_offset;
+ unsigned long lpar_rc;
+ int i;
+ unsigned long dummy1, dummy2;
+
+ /* pick a random slot to start at */
+ slot_offset = mftb() & 0x7;
+
+ for (i = 0; i < HPTES_PER_GROUP; i++) {
+
+ /* don't remove a bolted entry */
+ lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset,
+ HPTE_V_BOLTED, &dummy1, &dummy2);
+ if (lpar_rc == H_SUCCESS)
+ return i;
+
+ /*
+ * The test for adjunct partition is performed before the
+ * ANDCOND test. H_RESOURCE may be returned, so we need to
+ * check for that as well.
+ */
+ BUG_ON(lpar_rc != H_NOT_FOUND && lpar_rc != H_RESOURCE);
+
+ slot_offset++;
+ slot_offset &= 0x7;
+ }
+
+ return -1;
+}
+
+/* Called during kexec sequence with MMU off */
+static notrace void manual_hpte_clear_all(void)
+{
+ unsigned long size_bytes = 1UL << ppc64_pft_size;
+ unsigned long hpte_count = size_bytes >> 4;
+ struct {
+ unsigned long pteh;
+ unsigned long ptel;
+ } ptes[4];
+ long lpar_rc;
+ unsigned long i, j;
+
+ /* Read in batches of 4,
+ * invalidate only valid entries not in the VRMA
+ * hpte_count will be a multiple of 4
+ */
+ for (i = 0; i < hpte_count; i += 4) {
+ lpar_rc = plpar_pte_read_4_raw(0, i, (void *)ptes);
+ if (lpar_rc != H_SUCCESS) {
+ pr_info("Failed to read hash page table at %ld err %ld\n",
+ i, lpar_rc);
+ continue;
+ }
+ for (j = 0; j < 4; j++){
+ if ((ptes[j].pteh & HPTE_V_VRMA_MASK) ==
+ HPTE_V_VRMA_MASK)
+ continue;
+ if (ptes[j].pteh & HPTE_V_VALID)
+ plpar_pte_remove_raw(0, i + j, 0,
+ &(ptes[j].pteh), &(ptes[j].ptel));
+ }
+ }
+}
+
+/* Called during kexec sequence with MMU off */
+static notrace int hcall_hpte_clear_all(void)
+{
+ int rc;
+
+ do {
+ rc = plpar_hcall_norets(H_CLEAR_HPT);
+ } while (rc == H_CONTINUE);
+
+ return rc;
+}
+
+/* Called during kexec sequence with MMU off */
+static notrace void pseries_hpte_clear_all(void)
+{
+ int rc;
+
+ rc = hcall_hpte_clear_all();
+ if (rc != H_SUCCESS)
+ manual_hpte_clear_all();
+
+#ifdef __LITTLE_ENDIAN__
+ /*
+ * Reset exceptions to big endian.
+ *
+ * FIXME this is a hack for kexec, we need to reset the exception
+ * endian before starting the new kernel and this is a convenient place
+ * to do it.
+ *
+ * This is also called on boot when a fadump happens. In that case we
+ * must not change the exception endian mode.
+ */
+ if (firmware_has_feature(FW_FEATURE_SET_MODE) && !is_fadump_active())
+ pseries_big_endian_exceptions();
+#endif
+}
+
+/*
+ * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and
+ * the low 3 bits of flags happen to line up. So no transform is needed.
+ * We can probably optimize here and assume the high bits of newpp are
+ * already zero. For now I am paranoid.
+ */
+static long pSeries_lpar_hpte_updatepp(unsigned long slot,
+ unsigned long newpp,
+ unsigned long vpn,
+ int psize, int apsize,
+ int ssize, unsigned long inv_flags)
+{
+ unsigned long lpar_rc;
+ unsigned long flags;
+ unsigned long want_v;
+
+ want_v = hpte_encode_avpn(vpn, psize, ssize);
+
+ flags = (newpp & (HPTE_R_PP | HPTE_R_N | HPTE_R_KEY_LO)) | H_AVPN;
+ flags |= (newpp & HPTE_R_KEY_HI) >> 48;
+ if (mmu_has_feature(MMU_FTR_KERNEL_RO))
+ /* Move pp0 into bit 8 (IBM 55) */
+ flags |= (newpp & HPTE_R_PP0) >> 55;
+
+ pr_devel(" update: avpnv=%016lx, hash=%016lx, f=%lx, psize: %d ...",
+ want_v, slot, flags, psize);
+
+ lpar_rc = plpar_pte_protect(flags, slot, want_v);
+
+ if (lpar_rc == H_NOT_FOUND) {
+ pr_devel("not found !\n");
+ return -1;
+ }
+
+ pr_devel("ok\n");
+
+ BUG_ON(lpar_rc != H_SUCCESS);
+
+ return 0;
+}
+
+static long __pSeries_lpar_hpte_find(unsigned long want_v, unsigned long hpte_group)
+{
+ long lpar_rc;
+ unsigned long i, j;
+ struct {
+ unsigned long pteh;
+ unsigned long ptel;
+ } ptes[4];
+
+ for (i = 0; i < HPTES_PER_GROUP; i += 4, hpte_group += 4) {
+
+ lpar_rc = plpar_pte_read_4(0, hpte_group, (void *)ptes);
+ if (lpar_rc != H_SUCCESS) {
+ pr_info("Failed to read hash page table at %ld err %ld\n",
+ hpte_group, lpar_rc);
+ continue;
+ }
+
+ for (j = 0; j < 4; j++) {
+ if (HPTE_V_COMPARE(ptes[j].pteh, want_v) &&
+ (ptes[j].pteh & HPTE_V_VALID))
+ return i + j;
+ }
+ }
+
+ return -1;
+}
+
+static long pSeries_lpar_hpte_find(unsigned long vpn, int psize, int ssize)
+{
+ long slot;
+ unsigned long hash;
+ unsigned long want_v;
+ unsigned long hpte_group;
+
+ hash = hpt_hash(vpn, mmu_psize_defs[psize].shift, ssize);
+ want_v = hpte_encode_avpn(vpn, psize, ssize);
+
+ /*
+ * We try to keep bolted entries always in primary hash
+ * But in some case we can find them in secondary too.
+ */
+ hpte_group = (hash & htab_hash_mask) * HPTES_PER_GROUP;
+ slot = __pSeries_lpar_hpte_find(want_v, hpte_group);
+ if (slot < 0) {
+ /* Try in secondary */
+ hpte_group = (~hash & htab_hash_mask) * HPTES_PER_GROUP;
+ slot = __pSeries_lpar_hpte_find(want_v, hpte_group);
+ if (slot < 0)
+ return -1;
+ }
+ return hpte_group + slot;
+}
+
+static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp,
+ unsigned long ea,
+ int psize, int ssize)
+{
+ unsigned long vpn;
+ unsigned long lpar_rc, slot, vsid, flags;
+
+ vsid = get_kernel_vsid(ea, ssize);
+ vpn = hpt_vpn(ea, vsid, ssize);
+
+ slot = pSeries_lpar_hpte_find(vpn, psize, ssize);
+ BUG_ON(slot == -1);
+
+ flags = newpp & (HPTE_R_PP | HPTE_R_N);
+ if (mmu_has_feature(MMU_FTR_KERNEL_RO))
+ /* Move pp0 into bit 8 (IBM 55) */
+ flags |= (newpp & HPTE_R_PP0) >> 55;
+
+ flags |= ((newpp & HPTE_R_KEY_HI) >> 48) | (newpp & HPTE_R_KEY_LO);
+
+ lpar_rc = plpar_pte_protect(flags, slot, 0);
+
+ BUG_ON(lpar_rc != H_SUCCESS);
+}
+
+static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long vpn,
+ int psize, int apsize,
+ int ssize, int local)
+{
+ unsigned long want_v;
+ unsigned long lpar_rc;
+ unsigned long dummy1, dummy2;
+
+ pr_devel(" inval : slot=%lx, vpn=%016lx, psize: %d, local: %d\n",
+ slot, vpn, psize, local);
+
+ want_v = hpte_encode_avpn(vpn, psize, ssize);
+ lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v, &dummy1, &dummy2);
+ if (lpar_rc == H_NOT_FOUND)
+ return;
+
+ BUG_ON(lpar_rc != H_SUCCESS);
+}
+
+
+/*
+ * As defined in the PAPR's section 14.5.4.1.8
+ * The control mask doesn't include the returned reference and change bit from
+ * the processed PTE.
+ */
+#define HBLKR_AVPN 0x0100000000000000UL
+#define HBLKR_CTRL_MASK 0xf800000000000000UL
+#define HBLKR_CTRL_SUCCESS 0x8000000000000000UL
+#define HBLKR_CTRL_ERRNOTFOUND 0x8800000000000000UL
+#define HBLKR_CTRL_ERRBUSY 0xa000000000000000UL
+
+/*
+ * Returned true if we are supporting this block size for the specified segment
+ * base page size and actual page size.
+ *
+ * Currently, we only support 8 size block.
+ */
+static inline bool is_supported_hlbkrm(int bpsize, int psize)
+{
+ return (hblkrm_size[bpsize][psize] == HBLKRM_SUPPORTED_BLOCK_SIZE);
+}
+
+/**
+ * H_BLOCK_REMOVE caller.
+ * @idx should point to the latest @param entry set with a PTEX.
+ * If PTE cannot be processed because another CPUs has already locked that
+ * group, those entries are put back in @param starting at index 1.
+ * If entries has to be retried and @retry_busy is set to true, these entries
+ * are retried until success. If @retry_busy is set to false, the returned
+ * is the number of entries yet to process.
+ */
+static unsigned long call_block_remove(unsigned long idx, unsigned long *param,
+ bool retry_busy)
+{
+ unsigned long i, rc, new_idx;
+ unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
+
+ if (idx < 2) {
+ pr_warn("Unexpected empty call to H_BLOCK_REMOVE");
+ return 0;
+ }
+again:
+ new_idx = 0;
+ if (idx > PLPAR_HCALL9_BUFSIZE) {
+ pr_err("Too many PTEs (%lu) for H_BLOCK_REMOVE", idx);
+ idx = PLPAR_HCALL9_BUFSIZE;
+ } else if (idx < PLPAR_HCALL9_BUFSIZE)
+ param[idx] = HBR_END;
+
+ rc = plpar_hcall9(H_BLOCK_REMOVE, retbuf,
+ param[0], /* AVA */
+ param[1], param[2], param[3], param[4], /* TS0-7 */
+ param[5], param[6], param[7], param[8]);
+ if (rc == H_SUCCESS)
+ return 0;
+
+ BUG_ON(rc != H_PARTIAL);
+
+ /* Check that the unprocessed entries were 'not found' or 'busy' */
+ for (i = 0; i < idx-1; i++) {
+ unsigned long ctrl = retbuf[i] & HBLKR_CTRL_MASK;
+
+ if (ctrl == HBLKR_CTRL_ERRBUSY) {
+ param[++new_idx] = param[i+1];
+ continue;
+ }
+
+ BUG_ON(ctrl != HBLKR_CTRL_SUCCESS
+ && ctrl != HBLKR_CTRL_ERRNOTFOUND);
+ }
+
+ /*
+ * If there were entries found busy, retry these entries if requested,
+ * of if all the entries have to be retried.
+ */
+ if (new_idx && (retry_busy || new_idx == (PLPAR_HCALL9_BUFSIZE-1))) {
+ idx = new_idx + 1;
+ goto again;
+ }
+
+ return new_idx;
+}
+
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+/*
+ * Limit iterations holding pSeries_lpar_tlbie_lock to 3. We also need
+ * to make sure that we avoid bouncing the hypervisor tlbie lock.
+ */
+#define PPC64_HUGE_HPTE_BATCH 12
+
+static void hugepage_block_invalidate(unsigned long *slot, unsigned long *vpn,
+ int count, int psize, int ssize)
+{
+ unsigned long param[PLPAR_HCALL9_BUFSIZE];
+ unsigned long shift, current_vpgb, vpgb;
+ int i, pix = 0;
+
+ shift = mmu_psize_defs[psize].shift;
+
+ for (i = 0; i < count; i++) {
+ /*
+ * Shifting 3 bits more on the right to get a
+ * 8 pages aligned virtual addresse.
+ */
+ vpgb = (vpn[i] >> (shift - VPN_SHIFT + 3));
+ if (!pix || vpgb != current_vpgb) {
+ /*
+ * Need to start a new 8 pages block, flush
+ * the current one if needed.
+ */
+ if (pix)
+ (void)call_block_remove(pix, param, true);
+ current_vpgb = vpgb;
+ param[0] = hpte_encode_avpn(vpn[i], psize, ssize);
+ pix = 1;
+ }
+
+ param[pix++] = HBR_REQUEST | HBLKR_AVPN | slot[i];
+ if (pix == PLPAR_HCALL9_BUFSIZE) {
+ pix = call_block_remove(pix, param, false);
+ /*
+ * pix = 0 means that all the entries were
+ * removed, we can start a new block.
+ * Otherwise, this means that there are entries
+ * to retry, and pix points to latest one, so
+ * we should increment it and try to continue
+ * the same block.
+ */
+ if (pix)
+ pix++;
+ }
+ }
+ if (pix)
+ (void)call_block_remove(pix, param, true);
+}
+
+static void hugepage_bulk_invalidate(unsigned long *slot, unsigned long *vpn,
+ int count, int psize, int ssize)
+{
+ unsigned long param[PLPAR_HCALL9_BUFSIZE];
+ int i = 0, pix = 0, rc;
+
+ for (i = 0; i < count; i++) {
+
+ if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
+ pSeries_lpar_hpte_invalidate(slot[i], vpn[i], psize, 0,
+ ssize, 0);
+ } else {
+ param[pix] = HBR_REQUEST | HBR_AVPN | slot[i];
+ param[pix+1] = hpte_encode_avpn(vpn[i], psize, ssize);
+ pix += 2;
+ if (pix == 8) {
+ rc = plpar_hcall9(H_BULK_REMOVE, param,
+ param[0], param[1], param[2],
+ param[3], param[4], param[5],
+ param[6], param[7]);
+ BUG_ON(rc != H_SUCCESS);
+ pix = 0;
+ }
+ }
+ }
+ if (pix) {
+ param[pix] = HBR_END;
+ rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1],
+ param[2], param[3], param[4], param[5],
+ param[6], param[7]);
+ BUG_ON(rc != H_SUCCESS);
+ }
+}
+
+static inline void __pSeries_lpar_hugepage_invalidate(unsigned long *slot,
+ unsigned long *vpn,
+ int count, int psize,
+ int ssize)
+{
+ unsigned long flags = 0;
+ int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE);
+
+ if (lock_tlbie)
+ spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
+
+ /* Assuming THP size is 16M */
+ if (is_supported_hlbkrm(psize, MMU_PAGE_16M))
+ hugepage_block_invalidate(slot, vpn, count, psize, ssize);
+ else
+ hugepage_bulk_invalidate(slot, vpn, count, psize, ssize);
+
+ if (lock_tlbie)
+ spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
+}
+
+static void pSeries_lpar_hugepage_invalidate(unsigned long vsid,
+ unsigned long addr,
+ unsigned char *hpte_slot_array,
+ int psize, int ssize, int local)
+{
+ int i, index = 0;
+ unsigned long s_addr = addr;
+ unsigned int max_hpte_count, valid;
+ unsigned long vpn_array[PPC64_HUGE_HPTE_BATCH];
+ unsigned long slot_array[PPC64_HUGE_HPTE_BATCH];
+ unsigned long shift, hidx, vpn = 0, hash, slot;
+
+ shift = mmu_psize_defs[psize].shift;
+ max_hpte_count = 1U << (PMD_SHIFT - shift);
+
+ for (i = 0; i < max_hpte_count; i++) {
+ valid = hpte_valid(hpte_slot_array, i);
+ if (!valid)
+ continue;
+ hidx = hpte_hash_index(hpte_slot_array, i);
+
+ /* get the vpn */
+ addr = s_addr + (i * (1ul << shift));
+ vpn = hpt_vpn(addr, vsid, ssize);
+ hash = hpt_hash(vpn, shift, ssize);
+ if (hidx & _PTEIDX_SECONDARY)
+ hash = ~hash;
+
+ slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
+ slot += hidx & _PTEIDX_GROUP_IX;
+
+ slot_array[index] = slot;
+ vpn_array[index] = vpn;
+ if (index == PPC64_HUGE_HPTE_BATCH - 1) {
+ /*
+ * Now do a bluk invalidate
+ */
+ __pSeries_lpar_hugepage_invalidate(slot_array,
+ vpn_array,
+ PPC64_HUGE_HPTE_BATCH,
+ psize, ssize);
+ index = 0;
+ } else
+ index++;
+ }
+ if (index)
+ __pSeries_lpar_hugepage_invalidate(slot_array, vpn_array,
+ index, psize, ssize);
+}
+#else
+static void pSeries_lpar_hugepage_invalidate(unsigned long vsid,
+ unsigned long addr,
+ unsigned char *hpte_slot_array,
+ int psize, int ssize, int local)
+{
+ WARN(1, "%s called without THP support\n", __func__);
+}
+#endif
+
+static int pSeries_lpar_hpte_removebolted(unsigned long ea,
+ int psize, int ssize)
+{
+ unsigned long vpn;
+ unsigned long slot, vsid;
+
+ vsid = get_kernel_vsid(ea, ssize);
+ vpn = hpt_vpn(ea, vsid, ssize);
+
+ slot = pSeries_lpar_hpte_find(vpn, psize, ssize);
+ if (slot == -1)
+ return -ENOENT;
+
+ /*
+ * lpar doesn't use the passed actual page size
+ */
+ pSeries_lpar_hpte_invalidate(slot, vpn, psize, 0, ssize, 0);
+ return 0;
+}
+
+
+static inline unsigned long compute_slot(real_pte_t pte,
+ unsigned long vpn,
+ unsigned long index,
+ unsigned long shift,
+ int ssize)
+{
+ unsigned long slot, hash, hidx;
+
+ hash = hpt_hash(vpn, shift, ssize);
+ hidx = __rpte_to_hidx(pte, index);
+ if (hidx & _PTEIDX_SECONDARY)
+ hash = ~hash;
+ slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
+ slot += hidx & _PTEIDX_GROUP_IX;
+ return slot;
+}
+
+/**
+ * The hcall H_BLOCK_REMOVE implies that the virtual pages to processed are
+ * "all within the same naturally aligned 8 page virtual address block".
+ */
+static void do_block_remove(unsigned long number, struct ppc64_tlb_batch *batch,
+ unsigned long *param)
+{
+ unsigned long vpn;
+ unsigned long i, pix = 0;
+ unsigned long index, shift, slot, current_vpgb, vpgb;
+ real_pte_t pte;
+ int psize, ssize;
+
+ psize = batch->psize;
+ ssize = batch->ssize;
+
+ for (i = 0; i < number; i++) {
+ vpn = batch->vpn[i];
+ pte = batch->pte[i];
+ pte_iterate_hashed_subpages(pte, psize, vpn, index, shift) {
+ /*
+ * Shifting 3 bits more on the right to get a
+ * 8 pages aligned virtual addresse.
+ */
+ vpgb = (vpn >> (shift - VPN_SHIFT + 3));
+ if (!pix || vpgb != current_vpgb) {
+ /*
+ * Need to start a new 8 pages block, flush
+ * the current one if needed.
+ */
+ if (pix)
+ (void)call_block_remove(pix, param,
+ true);
+ current_vpgb = vpgb;
+ param[0] = hpte_encode_avpn(vpn, psize,
+ ssize);
+ pix = 1;
+ }
+
+ slot = compute_slot(pte, vpn, index, shift, ssize);
+ param[pix++] = HBR_REQUEST | HBLKR_AVPN | slot;
+
+ if (pix == PLPAR_HCALL9_BUFSIZE) {
+ pix = call_block_remove(pix, param, false);
+ /*
+ * pix = 0 means that all the entries were
+ * removed, we can start a new block.
+ * Otherwise, this means that there are entries
+ * to retry, and pix points to latest one, so
+ * we should increment it and try to continue
+ * the same block.
+ */
+ if (pix)
+ pix++;
+ }
+ } pte_iterate_hashed_end();
+ }
+
+ if (pix)
+ (void)call_block_remove(pix, param, true);
+}
+
+/*
+ * TLB Block Invalidate Characteristics
+ *
+ * These characteristics define the size of the block the hcall H_BLOCK_REMOVE
+ * is able to process for each couple segment base page size, actual page size.
+ *
+ * The ibm,get-system-parameter properties is returning a buffer with the
+ * following layout:
+ *
+ * [ 2 bytes size of the RTAS buffer (excluding these 2 bytes) ]
+ * -----------------
+ * TLB Block Invalidate Specifiers:
+ * [ 1 byte LOG base 2 of the TLB invalidate block size being specified ]
+ * [ 1 byte Number of page sizes (N) that are supported for the specified
+ * TLB invalidate block size ]
+ * [ 1 byte Encoded segment base page size and actual page size
+ * MSB=0 means 4k segment base page size and actual page size
+ * MSB=1 the penc value in mmu_psize_def ]
+ * ...
+ * -----------------
+ * Next TLB Block Invalidate Specifiers...
+ * -----------------
+ * [ 0 ]
+ */
+static inline void set_hblkrm_bloc_size(int bpsize, int psize,
+ unsigned int block_size)
+{
+ if (block_size > hblkrm_size[bpsize][psize])
+ hblkrm_size[bpsize][psize] = block_size;
+}
+
+/*
+ * Decode the Encoded segment base page size and actual page size.
+ * PAPR specifies:
+ * - bit 7 is the L bit
+ * - bits 0-5 are the penc value
+ * If the L bit is 0, this means 4K segment base page size and actual page size
+ * otherwise the penc value should be read.
+ */
+#define HBLKRM_L_MASK 0x80
+#define HBLKRM_PENC_MASK 0x3f
+static inline void __init check_lp_set_hblkrm(unsigned int lp,
+ unsigned int block_size)
+{
+ unsigned int bpsize, psize;
+
+ /* First, check the L bit, if not set, this means 4K */
+ if ((lp & HBLKRM_L_MASK) == 0) {
+ set_hblkrm_bloc_size(MMU_PAGE_4K, MMU_PAGE_4K, block_size);
+ return;
+ }
+
+ lp &= HBLKRM_PENC_MASK;
+ for (bpsize = 0; bpsize < MMU_PAGE_COUNT; bpsize++) {
+ struct mmu_psize_def *def = &mmu_psize_defs[bpsize];
+
+ for (psize = 0; psize < MMU_PAGE_COUNT; psize++) {
+ if (def->penc[psize] == lp) {
+ set_hblkrm_bloc_size(bpsize, psize, block_size);
+ return;
+ }
+ }
+ }
+}
+
+#define SPLPAR_TLB_BIC_TOKEN 50
+
+/*
+ * The size of the TLB Block Invalidate Characteristics is variable. But at the
+ * maximum it will be the number of possible page sizes *2 + 10 bytes.
+ * Currently MMU_PAGE_COUNT is 16, which means 42 bytes. Use a cache line size
+ * (128 bytes) for the buffer to get plenty of space.
+ */
+#define SPLPAR_TLB_BIC_MAXLENGTH 128
+
+void __init pseries_lpar_read_hblkrm_characteristics(void)
+{
+ unsigned char local_buffer[SPLPAR_TLB_BIC_MAXLENGTH];
+ int call_status, len, idx, bpsize;
+
+ if (!firmware_has_feature(FW_FEATURE_BLOCK_REMOVE))
+ return;
+
+ spin_lock(&rtas_data_buf_lock);
+ memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE);
+ call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
+ NULL,
+ SPLPAR_TLB_BIC_TOKEN,
+ __pa(rtas_data_buf),
+ RTAS_DATA_BUF_SIZE);
+ memcpy(local_buffer, rtas_data_buf, SPLPAR_TLB_BIC_MAXLENGTH);
+ local_buffer[SPLPAR_TLB_BIC_MAXLENGTH - 1] = '\0';
+ spin_unlock(&rtas_data_buf_lock);
+
+ if (call_status != 0) {
+ pr_warn("%s %s Error calling get-system-parameter (0x%x)\n",
+ __FILE__, __func__, call_status);
+ return;
+ }
+
+ /*
+ * The first two (2) bytes of the data in the buffer are the length of
+ * the returned data, not counting these first two (2) bytes.
+ */
+ len = be16_to_cpu(*((u16 *)local_buffer)) + 2;
+ if (len > SPLPAR_TLB_BIC_MAXLENGTH) {
+ pr_warn("%s too large returned buffer %d", __func__, len);
+ return;
+ }
+
+ idx = 2;
+ while (idx < len) {
+ u8 block_shift = local_buffer[idx++];
+ u32 block_size;
+ unsigned int npsize;
+
+ if (!block_shift)
+ break;
+
+ block_size = 1 << block_shift;
+
+ for (npsize = local_buffer[idx++];
+ npsize > 0 && idx < len; npsize--)
+ check_lp_set_hblkrm((unsigned int) local_buffer[idx++],
+ block_size);
+ }
+
+ for (bpsize = 0; bpsize < MMU_PAGE_COUNT; bpsize++)
+ for (idx = 0; idx < MMU_PAGE_COUNT; idx++)
+ if (hblkrm_size[bpsize][idx])
+ pr_info("H_BLOCK_REMOVE supports base psize:%d psize:%d block size:%d",
+ bpsize, idx, hblkrm_size[bpsize][idx]);
+}
+
+/*
+ * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie
+ * lock.
+ */
+static void pSeries_lpar_flush_hash_range(unsigned long number, int local)
+{
+ unsigned long vpn;
+ unsigned long i, pix, rc;
+ unsigned long flags = 0;
+ struct ppc64_tlb_batch *batch = this_cpu_ptr(&ppc64_tlb_batch);
+ int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE);
+ unsigned long param[PLPAR_HCALL9_BUFSIZE];
+ unsigned long index, shift, slot;
+ real_pte_t pte;
+ int psize, ssize;
+
+ if (lock_tlbie)
+ spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
+
+ if (is_supported_hlbkrm(batch->psize, batch->psize)) {
+ do_block_remove(number, batch, param);
+ goto out;
+ }
+
+ psize = batch->psize;
+ ssize = batch->ssize;
+ pix = 0;
+ for (i = 0; i < number; i++) {
+ vpn = batch->vpn[i];
+ pte = batch->pte[i];
+ pte_iterate_hashed_subpages(pte, psize, vpn, index, shift) {
+ slot = compute_slot(pte, vpn, index, shift, ssize);
+ if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
+ /*
+ * lpar doesn't use the passed actual page size
+ */
+ pSeries_lpar_hpte_invalidate(slot, vpn, psize,
+ 0, ssize, local);
+ } else {
+ param[pix] = HBR_REQUEST | HBR_AVPN | slot;
+ param[pix+1] = hpte_encode_avpn(vpn, psize,
+ ssize);
+ pix += 2;
+ if (pix == 8) {
+ rc = plpar_hcall9(H_BULK_REMOVE, param,
+ param[0], param[1], param[2],
+ param[3], param[4], param[5],
+ param[6], param[7]);
+ BUG_ON(rc != H_SUCCESS);
+ pix = 0;
+ }
+ }
+ } pte_iterate_hashed_end();
+ }
+ if (pix) {
+ param[pix] = HBR_END;
+ rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1],
+ param[2], param[3], param[4], param[5],
+ param[6], param[7]);
+ BUG_ON(rc != H_SUCCESS);
+ }
+
+out:
+ if (lock_tlbie)
+ spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
+}
+
+static int __init disable_bulk_remove(char *str)
+{
+ if (strcmp(str, "off") == 0 &&
+ firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
+ pr_info("Disabling BULK_REMOVE firmware feature");
+ powerpc_firmware_features &= ~FW_FEATURE_BULK_REMOVE;
+ }
+ return 1;
+}
+
+__setup("bulk_remove=", disable_bulk_remove);
+
+#define HPT_RESIZE_TIMEOUT 10000 /* ms */
+
+struct hpt_resize_state {
+ unsigned long shift;
+ int commit_rc;
+};
+
+static int pseries_lpar_resize_hpt_commit(void *data)
+{
+ struct hpt_resize_state *state = data;
+
+ state->commit_rc = plpar_resize_hpt_commit(0, state->shift);
+ if (state->commit_rc != H_SUCCESS)
+ return -EIO;
+
+ /* Hypervisor has transitioned the HTAB, update our globals */
+ ppc64_pft_size = state->shift;
+ htab_size_bytes = 1UL << ppc64_pft_size;
+ htab_hash_mask = (htab_size_bytes >> 7) - 1;
+
+ return 0;
+}
+
+/*
+ * Must be called in process context. The caller must hold the
+ * cpus_lock.
+ */
+static int pseries_lpar_resize_hpt(unsigned long shift)
+{
+ struct hpt_resize_state state = {
+ .shift = shift,
+ .commit_rc = H_FUNCTION,
+ };
+ unsigned int delay, total_delay = 0;
+ int rc;
+ ktime_t t0, t1, t2;
+
+ might_sleep();
+
+ if (!firmware_has_feature(FW_FEATURE_HPT_RESIZE))
+ return -ENODEV;
+
+ pr_info("Attempting to resize HPT to shift %lu\n", shift);
+
+ t0 = ktime_get();
+
+ rc = plpar_resize_hpt_prepare(0, shift);
+ while (H_IS_LONG_BUSY(rc)) {
+ delay = get_longbusy_msecs(rc);
+ total_delay += delay;
+ if (total_delay > HPT_RESIZE_TIMEOUT) {
+ /* prepare with shift==0 cancels an in-progress resize */
+ rc = plpar_resize_hpt_prepare(0, 0);
+ if (rc != H_SUCCESS)
+ pr_warn("Unexpected error %d cancelling timed out HPT resize\n",
+ rc);
+ return -ETIMEDOUT;
+ }
+ msleep(delay);
+ rc = plpar_resize_hpt_prepare(0, shift);
+ }
+
+ switch (rc) {
+ case H_SUCCESS:
+ /* Continue on */
+ break;
+
+ case H_PARAMETER:
+ pr_warn("Invalid argument from H_RESIZE_HPT_PREPARE\n");
+ return -EINVAL;
+ case H_RESOURCE:
+ pr_warn("Operation not permitted from H_RESIZE_HPT_PREPARE\n");
+ return -EPERM;
+ default:
+ pr_warn("Unexpected error %d from H_RESIZE_HPT_PREPARE\n", rc);
+ return -EIO;
+ }
+
+ t1 = ktime_get();
+
+ rc = stop_machine_cpuslocked(pseries_lpar_resize_hpt_commit,
+ &state, NULL);
+
+ t2 = ktime_get();
+
+ if (rc != 0) {
+ switch (state.commit_rc) {
+ case H_PTEG_FULL:
+ return -ENOSPC;
+
+ default:
+ pr_warn("Unexpected error %d from H_RESIZE_HPT_COMMIT\n",
+ state.commit_rc);
+ return -EIO;
+ };
+ }
+
+ pr_info("HPT resize to shift %lu complete (%lld ms / %lld ms)\n",
+ shift, (long long) ktime_ms_delta(t1, t0),
+ (long long) ktime_ms_delta(t2, t1));
+
+ return 0;
+}
+
+void __init hpte_init_pseries(void)
+{
+ mmu_hash_ops.hpte_invalidate = pSeries_lpar_hpte_invalidate;
+ mmu_hash_ops.hpte_updatepp = pSeries_lpar_hpte_updatepp;
+ mmu_hash_ops.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp;
+ mmu_hash_ops.hpte_insert = pSeries_lpar_hpte_insert;
+ mmu_hash_ops.hpte_remove = pSeries_lpar_hpte_remove;
+ mmu_hash_ops.hpte_removebolted = pSeries_lpar_hpte_removebolted;
+ mmu_hash_ops.flush_hash_range = pSeries_lpar_flush_hash_range;
+ mmu_hash_ops.hpte_clear_all = pseries_hpte_clear_all;
+ mmu_hash_ops.hugepage_invalidate = pSeries_lpar_hugepage_invalidate;
+
+ if (firmware_has_feature(FW_FEATURE_HPT_RESIZE))
+ mmu_hash_ops.resize_hpt = pseries_lpar_resize_hpt;
+
+ /*
+ * On POWER9, we need to do a H_REGISTER_PROC_TBL hcall
+ * to inform the hypervisor that we wish to use the HPT.
+ */
+ if (cpu_has_feature(CPU_FTR_ARCH_300))
+ pseries_lpar_register_process_table(0, 0, 0);
+}
+#endif /* CONFIG_PPC_64S_HASH_MMU */
+
+#ifdef CONFIG_PPC_RADIX_MMU
+void __init radix_init_pseries(void)
+{
+ pr_info("Using radix MMU under hypervisor\n");
+
+ pseries_lpar_register_process_table(__pa(process_tb),
+ 0, PRTB_SIZE_SHIFT - 12);
+}
+#endif
+
+#ifdef CONFIG_PPC_SMLPAR
+#define CMO_FREE_HINT_DEFAULT 1
+static int cmo_free_hint_flag = CMO_FREE_HINT_DEFAULT;
+
+static int __init cmo_free_hint(char *str)
+{
+ char *parm;
+ parm = strstrip(str);
+
+ if (strcasecmp(parm, "no") == 0 || strcasecmp(parm, "off") == 0) {
+ pr_info("%s: CMO free page hinting is not active.\n", __func__);
+ cmo_free_hint_flag = 0;
+ return 1;
+ }
+
+ cmo_free_hint_flag = 1;
+ pr_info("%s: CMO free page hinting is active.\n", __func__);
+
+ if (strcasecmp(parm, "yes") == 0 || strcasecmp(parm, "on") == 0)
+ return 1;
+
+ return 0;
+}
+
+__setup("cmo_free_hint=", cmo_free_hint);
+
+static void pSeries_set_page_state(struct page *page, int order,
+ unsigned long state)
+{
+ int i, j;
+ unsigned long cmo_page_sz, addr;
+
+ cmo_page_sz = cmo_get_page_size();
+ addr = __pa((unsigned long)page_address(page));
+
+ for (i = 0; i < (1 << order); i++, addr += PAGE_SIZE) {
+ for (j = 0; j < PAGE_SIZE; j += cmo_page_sz)
+ plpar_hcall_norets(H_PAGE_INIT, state, addr + j, 0);
+ }
+}
+
+void arch_free_page(struct page *page, int order)
+{
+ if (radix_enabled())
+ return;
+ if (!cmo_free_hint_flag || !firmware_has_feature(FW_FEATURE_CMO))
+ return;
+
+ pSeries_set_page_state(page, order, H_PAGE_SET_UNUSED);
+}
+EXPORT_SYMBOL(arch_free_page);
+
+#endif /* CONFIG_PPC_SMLPAR */
+#endif /* CONFIG_PPC_BOOK3S_64 */
+
+#ifdef CONFIG_TRACEPOINTS
+#ifdef CONFIG_JUMP_LABEL
+struct static_key hcall_tracepoint_key = STATIC_KEY_INIT;
+
+int hcall_tracepoint_regfunc(void)
+{
+ static_key_slow_inc(&hcall_tracepoint_key);
+ return 0;
+}
+
+void hcall_tracepoint_unregfunc(void)
+{
+ static_key_slow_dec(&hcall_tracepoint_key);
+}
+#else
+/*
+ * We optimise our hcall path by placing hcall_tracepoint_refcount
+ * directly in the TOC so we can check if the hcall tracepoints are
+ * enabled via a single load.
+ */
+
+/* NB: reg/unreg are called while guarded with the tracepoints_mutex */
+extern long hcall_tracepoint_refcount;
+
+int hcall_tracepoint_regfunc(void)
+{
+ hcall_tracepoint_refcount++;
+ return 0;
+}
+
+void hcall_tracepoint_unregfunc(void)
+{
+ hcall_tracepoint_refcount--;
+}
+#endif
+
+/*
+ * Keep track of hcall tracing depth and prevent recursion. Warn if any is
+ * detected because it may indicate a problem. This will not catch all
+ * problems with tracing code making hcalls, because the tracing might have
+ * been invoked from a non-hcall, so the first hcall could recurse into it
+ * without warning here, but this better than nothing.
+ *
+ * Hcalls with specific problems being traced should use the _notrace
+ * plpar_hcall variants.
+ */
+static DEFINE_PER_CPU(unsigned int, hcall_trace_depth);
+
+
+notrace void __trace_hcall_entry(unsigned long opcode, unsigned long *args)
+{
+ unsigned long flags;
+ unsigned int *depth;
+
+ local_irq_save(flags);
+
+ depth = this_cpu_ptr(&hcall_trace_depth);
+
+ if (WARN_ON_ONCE(*depth))
+ goto out;
+
+ (*depth)++;
+ preempt_disable();
+ trace_hcall_entry(opcode, args);
+ (*depth)--;
+
+out:
+ local_irq_restore(flags);
+}
+
+notrace void __trace_hcall_exit(long opcode, long retval, unsigned long *retbuf)
+{
+ unsigned long flags;
+ unsigned int *depth;
+
+ local_irq_save(flags);
+
+ depth = this_cpu_ptr(&hcall_trace_depth);
+
+ if (*depth) /* Don't warn again on the way out */
+ goto out;
+
+ (*depth)++;
+ trace_hcall_exit(opcode, retval, retbuf);
+ preempt_enable();
+ (*depth)--;
+
+out:
+ local_irq_restore(flags);
+}
+#endif
+
+/**
+ * h_get_mpp
+ * H_GET_MPP hcall returns info in 7 parms
+ */
+int h_get_mpp(struct hvcall_mpp_data *mpp_data)
+{
+ int rc;
+ unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
+
+ rc = plpar_hcall9(H_GET_MPP, retbuf);
+
+ mpp_data->entitled_mem = retbuf[0];
+ mpp_data->mapped_mem = retbuf[1];
+
+ mpp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff;
+ mpp_data->pool_num = retbuf[2] & 0xffff;
+
+ mpp_data->mem_weight = (retbuf[3] >> 7 * 8) & 0xff;
+ mpp_data->unallocated_mem_weight = (retbuf[3] >> 6 * 8) & 0xff;
+ mpp_data->unallocated_entitlement = retbuf[3] & 0xffffffffffffUL;
+
+ mpp_data->pool_size = retbuf[4];
+ mpp_data->loan_request = retbuf[5];
+ mpp_data->backing_mem = retbuf[6];
+
+ return rc;
+}
+EXPORT_SYMBOL(h_get_mpp);
+
+int h_get_mpp_x(struct hvcall_mpp_x_data *mpp_x_data)
+{
+ int rc;
+ unsigned long retbuf[PLPAR_HCALL9_BUFSIZE] = { 0 };
+
+ rc = plpar_hcall9(H_GET_MPP_X, retbuf);
+
+ mpp_x_data->coalesced_bytes = retbuf[0];
+ mpp_x_data->pool_coalesced_bytes = retbuf[1];
+ mpp_x_data->pool_purr_cycles = retbuf[2];
+ mpp_x_data->pool_spurr_cycles = retbuf[3];
+
+ return rc;
+}
+
+#ifdef CONFIG_PPC_64S_HASH_MMU
+static unsigned long __init vsid_unscramble(unsigned long vsid, int ssize)
+{
+ unsigned long protovsid;
+ unsigned long va_bits = VA_BITS;
+ unsigned long modinv, vsid_modulus;
+ unsigned long max_mod_inv, tmp_modinv;
+
+ if (!mmu_has_feature(MMU_FTR_68_BIT_VA))
+ va_bits = 65;
+
+ if (ssize == MMU_SEGSIZE_256M) {
+ modinv = VSID_MULINV_256M;
+ vsid_modulus = ((1UL << (va_bits - SID_SHIFT)) - 1);
+ } else {
+ modinv = VSID_MULINV_1T;
+ vsid_modulus = ((1UL << (va_bits - SID_SHIFT_1T)) - 1);
+ }
+
+ /*
+ * vsid outside our range.
+ */
+ if (vsid >= vsid_modulus)
+ return 0;
+
+ /*
+ * If modinv is the modular multiplicate inverse of (x % vsid_modulus)
+ * and vsid = (protovsid * x) % vsid_modulus, then we say:
+ * protovsid = (vsid * modinv) % vsid_modulus
+ */
+
+ /* Check if (vsid * modinv) overflow (63 bits) */
+ max_mod_inv = 0x7fffffffffffffffull / vsid;
+ if (modinv < max_mod_inv)
+ return (vsid * modinv) % vsid_modulus;
+
+ tmp_modinv = modinv/max_mod_inv;
+ modinv %= max_mod_inv;
+
+ protovsid = (((vsid * max_mod_inv) % vsid_modulus) * tmp_modinv) % vsid_modulus;
+ protovsid = (protovsid + vsid * modinv) % vsid_modulus;
+
+ return protovsid;
+}
+
+static int __init reserve_vrma_context_id(void)
+{
+ unsigned long protovsid;
+
+ /*
+ * Reserve context ids which map to reserved virtual addresses. For now
+ * we only reserve the context id which maps to the VRMA VSID. We ignore
+ * the addresses in "ibm,adjunct-virtual-addresses" because we don't
+ * enable adjunct support via the "ibm,client-architecture-support"
+ * interface.
+ */
+ protovsid = vsid_unscramble(VRMA_VSID, MMU_SEGSIZE_1T);
+ hash__reserve_context_id(protovsid >> ESID_BITS_1T);
+ return 0;
+}
+machine_device_initcall(pseries, reserve_vrma_context_id);
+#endif
+
+#ifdef CONFIG_DEBUG_FS
+/* debugfs file interface for vpa data */
+static ssize_t vpa_file_read(struct file *filp, char __user *buf, size_t len,
+ loff_t *pos)
+{
+ int cpu = (long)filp->private_data;
+ struct lppaca *lppaca = &lppaca_of(cpu);
+
+ return simple_read_from_buffer(buf, len, pos, lppaca,
+ sizeof(struct lppaca));
+}
+
+static const struct file_operations vpa_fops = {
+ .open = simple_open,
+ .read = vpa_file_read,
+ .llseek = default_llseek,
+};
+
+static int __init vpa_debugfs_init(void)
+{
+ char name[16];
+ long i;
+ struct dentry *vpa_dir;
+
+ if (!firmware_has_feature(FW_FEATURE_SPLPAR))
+ return 0;
+
+ vpa_dir = debugfs_create_dir("vpa", arch_debugfs_dir);
+
+ /* set up the per-cpu vpa file*/
+ for_each_possible_cpu(i) {
+ sprintf(name, "cpu-%ld", i);
+ debugfs_create_file(name, 0400, vpa_dir, (void *)i, &vpa_fops);
+ }
+
+ return 0;
+}
+machine_arch_initcall(pseries, vpa_debugfs_init);
+#endif /* CONFIG_DEBUG_FS */