/* * 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 #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; } /* * PAPR says this feature is SLB-Buffer but firmware never * reports that. All SPLPAR support SLB shadow buffer. */ addr = __pa(paca[cpu].slb_shadow_ptr); if (firmware_has_feature(FW_FEATURE_SPLPAR)) { 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); } /* * Register dispatch trace log, if one has been allocated. */ pp = &paca[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; } } 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; /* Make pHyp happy */ if ((rflags & _PAGE_NO_CACHE) && !(rflags & _PAGE_WRITETHRU)) hpte_r &= ~HPTE_R_M; 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)) { if (!(vflags & HPTE_V_BOLTED)) pr_devel(" 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)) { if (!(vflags & HPTE_V_BOLTED)) pr_devel(" lpar err %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 pSeries_lpar_hptab_clear(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) 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)); } } #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()) { long rc; rc = pseries_big_endian_exceptions(); /* * At this point it is unlikely panic() will get anything * out to the user, but at least this will stop us from * continuing on further and creating an even more * difficult to debug situation. * * There is a known problem when kdump'ing, if cpus are offline * the above call will fail. Rather than panicking again, keep * going and hope the kdump kernel is also little endian, which * it usually is. */ if (rc && !kdump_in_progress()) panic("Could not enable 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 = (newpp & 7) | H_AVPN; unsigned long want_v; want_v = hpte_encode_avpn(vpn, psize, ssize); 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 unsigned long pSeries_lpar_hpte_getword0(unsigned long slot) { unsigned long dword0; unsigned long lpar_rc; unsigned long dummy_word1; unsigned long flags; /* Read 1 pte at a time */ /* Do not need RPN to logical page translation */ /* No cross CEC PFT access */ flags = 0; lpar_rc = plpar_pte_read(flags, slot, &dword0, &dummy_word1); BUG_ON(lpar_rc != H_SUCCESS); return dword0; } static long pSeries_lpar_hpte_find(unsigned long vpn, int psize, int ssize) { unsigned long hash; unsigned long i; long slot; unsigned long want_v, hpte_v; 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 */ slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; for (i = 0; i < HPTES_PER_GROUP; i++) { hpte_v = pSeries_lpar_hpte_getword0(slot); if (HPTE_V_COMPARE(hpte_v, want_v) && (hpte_v & HPTE_V_VALID)) /* HPTE matches */ return slot; ++slot; } return -1; } 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; 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); } /* * 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[8]; 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); } static void 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); BUG_ON(slot == -1); /* * lpar doesn't use the passed actual page size */ pSeries_lpar_hpte_invalidate(slot, vpn, psize, 0, ssize, 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[9]; 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)) { printk(KERN_INFO "Disabling BULK_REMOVE firmware feature"); powerpc_firmware_features &= ~FW_FEATURE_BULK_REMOVE; } return 1; } __setup("bulk_remove=", disable_bulk_remove); void __init hpte_init_lpar(void) { ppc_md.hpte_invalidate = pSeries_lpar_hpte_invalidate; ppc_md.hpte_updatepp = pSeries_lpar_hpte_updatepp; ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp; ppc_md.hpte_insert = pSeries_lpar_hpte_insert; ppc_md.hpte_remove = pSeries_lpar_hpte_remove; ppc_md.hpte_removebolted = pSeries_lpar_hpte_removebolted; ppc_md.flush_hash_range = pSeries_lpar_flush_hash_range; ppc_md.hpte_clear_all = pSeries_lpar_hptab_clear; ppc_md.hugepage_invalidate = pSeries_lpar_hugepage_invalidate; } #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) { printk(KERN_INFO "cmo_free_hint: CMO free page hinting is not active.\n"); cmo_free_hint_flag = 0; return 1; } cmo_free_hint_flag = 1; printk(KERN_INFO "cmo_free_hint: CMO free page hinting is active.\n"); 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 (!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 #ifdef CONFIG_TRACEPOINTS #ifdef HAVE_JUMP_LABEL struct static_key hcall_tracepoint_key = STATIC_KEY_INIT; void hcall_tracepoint_regfunc(void) { static_key_slow_inc(&hcall_tracepoint_key); } 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; void hcall_tracepoint_regfunc(void) { hcall_tracepoint_refcount++; } 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, unsigned 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; }