--- /dev/null
+/*
+ * 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;
+}
Code Review / kvmfornfv.git / blobdiff