text: /*
   * 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/jump_label.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 <asm/kexec.h>
  #include <asm/fadump.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.
  	 *
  	 * 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;
  }
  