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- /*
- * pSeries_lpar.c
- * Copyright (C) 2001 Todd Inglett, IBM Corporation
- *
- * pSeries LPAR support.
- *
- * 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 of the License, 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
- /* 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 <asm/processor.h>
- #include <asm/mmu.h>
- #include <asm/page.h>
- #include <asm/pgtable.h>
- #include <asm/machdep.h>
- #include <asm/mmu_context.h>
- #include <asm/iommu.h>
- #include <asm/tlb.h>
- #include <asm/prom.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/asm-prototypes.h>
- #include <asm/debugfs.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);
- void vpa_init(int cpu)
- {
- int hwcpu = get_hard_smp_processor_id(cpu);
- unsigned long addr;
- long ret;
- struct paca_struct *pp;
- struct dtl_entry *dtl;
- /*
- * 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_BOOK3S_64
- /*
- * 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_BOOK3S_64 */
- /*
- * Register dispatch trace log, if one has been allocated.
- */
- pp = paca_ptrs[cpu];
- dtl = pp->dispatch_log;
- if (dtl) {
- 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", smp_processor_id(),
- hwcpu, ret);
- lppaca_of(cpu).dtl_enable_mask = 2;
- }
- }
- #ifdef CONFIG_PPC_BOOK3S_64
- 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,
- (0x1UL << 4), &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;
- }
- static 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));
- }
- }
- }
- static int hcall_hpte_clear_all(void)
- {
- int rc;
- do {
- rc = plpar_hcall_norets(H_CLEAR_HPT);
- } while (rc == H_CONTINUE);
- return rc;
- }
- static 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 & 7) | H_AVPN;
- 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);
- /* Bolted entries are always in the primary group */
- 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 & 7;
- if (mmu_has_feature(MMU_FTR_KERNEL_RO))
- /* Move pp0 into bit 8 (IBM 55) */
- flags |= (newpp & HPTE_R_PP0) >> 55;
- 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);
- }
- #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 __pSeries_lpar_hugepage_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;
- 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);
- 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);
- }
- 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;
- }
- /*
- * 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 hash, index, shift, hidx, slot;
- real_pte_t pte;
- int psize, ssize;
- if (lock_tlbie)
- spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
- 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) {
- 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;
- 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);
- }
- 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:
- return -EINVAL;
- case H_RESOURCE:
- 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:
- pr_warn("Hash collision while resizing HPT\n");
- 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;
- }
- static int 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 | 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;
- }
- 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;
- register_process_table = pseries_lpar_register_process_table;
- if (firmware_has_feature(FW_FEATURE_HPT_RESIZE))
- mmu_hash_ops.resize_hpt = pseries_lpar_resize_hpt;
- }
- void radix_init_pseries(void)
- {
- pr_info("Using radix MMU under hypervisor\n");
- register_process_table = pseries_lpar_register_process_table;
- }
- #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
- /*
- * Since the tracing code might execute hcalls we need to guard against
- * recursion. One example of this are spinlocks calling H_YIELD on
- * shared processor partitions.
- */
- static DEFINE_PER_CPU(unsigned int, hcall_trace_depth);
- void __trace_hcall_entry(unsigned long opcode, unsigned long *args)
- {
- unsigned long flags;
- unsigned int *depth;
- /*
- * We cannot call tracepoints inside RCU idle regions which
- * means we must not trace H_CEDE.
- */
- if (opcode == H_CEDE)
- return;
- local_irq_save(flags);
- depth = this_cpu_ptr(&hcall_trace_depth);
- if (*depth)
- goto out;
- (*depth)++;
- preempt_disable();
- trace_hcall_entry(opcode, args);
- (*depth)--;
- out:
- local_irq_restore(flags);
- }
- void __trace_hcall_exit(long opcode, long retval, unsigned long *retbuf)
- {
- unsigned long flags;
- unsigned int *depth;
- if (opcode == H_CEDE)
- return;
- local_irq_save(flags);
- depth = this_cpu_ptr(&hcall_trace_depth);
- if (*depth)
- 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;
- }
- static unsigned long 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);
- #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", powerpc_debugfs_root);
- if (!vpa_dir) {
- pr_warn("%s: can't create vpa root dir\n", __func__);
- return -ENOMEM;
- }
- /* set up the per-cpu vpa file*/
- for_each_possible_cpu(i) {
- struct dentry *d;
- sprintf(name, "cpu-%ld", i);
- d = debugfs_create_file(name, 0400, vpa_dir, (void *)i,
- &vpa_fops);
- if (!d) {
- pr_warn("%s: can't create per-cpu vpa file\n",
- __func__);
- return -ENOMEM;
- }
- }
- return 0;
- }
- machine_arch_initcall(pseries, vpa_debugfs_init);
- #endif /* CONFIG_DEBUG_FS */
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