// 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #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); } /* * 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 /** * 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); if (firmware_has_feature(FW_FEATURE_BLOCK_REMOVE)) 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); } /* * 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 (firmware_has_feature(FW_FEATURE_BLOCK_REMOVE)) { 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 user context */ 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(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; } 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; static 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 */