arch/powerpc/platforms/pseries/lpar.c - kernel/msm-4.19 - Gitiles

 /*
  * 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 <linux/kernel.h>
 #include <linux/dma-mapping.h>
 #include <linux/console.h>
 #include <linux/export.h>
 #include <linux/static_key.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/tlbflush.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 "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 */
 	if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
 		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.
 		 */
 		if (rc)
 			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, int local)
 {
 	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 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 = &__get_cpu_var(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 CONFIG_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 = &__get_cpu_var(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 = &__get_cpu_var(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;
 }
	/*
	* 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 <linux/kernel.h>
	#include <linux/dma-mapping.h>
	#include <linux/console.h>
	#include <linux/export.h>
	#include <linux/static_key.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/tlbflush.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 "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 */
	if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
	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.
	*/
	if (rc)
	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, int local)
	{
	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 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 = &__get_cpu_var(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 CONFIG_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 = &__get_cpu_var(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 = &__get_cpu_var(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;
	}