forked from Minki/linux
5524a27d39
This patch convert different functions to take virtual page number instead of virtual address. Virtual page number is virtual address shifted right by VPN_SHIFT (12) bits. This enable us to have an address range of upto 76 bits. Reviewed-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
627 lines
16 KiB
C
627 lines
16 KiB
C
/*
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* pSeries_lpar.c
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* Copyright (C) 2001 Todd Inglett, IBM Corporation
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*
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* pSeries LPAR support.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/* Enables debugging of low-level hash table routines - careful! */
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#undef DEBUG
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#include <linux/kernel.h>
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#include <linux/dma-mapping.h>
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#include <linux/console.h>
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#include <linux/export.h>
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#include <asm/processor.h>
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#include <asm/mmu.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/machdep.h>
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#include <asm/mmu_context.h>
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#include <asm/iommu.h>
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#include <asm/tlbflush.h>
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#include <asm/tlb.h>
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#include <asm/prom.h>
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#include <asm/cputable.h>
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#include <asm/udbg.h>
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#include <asm/smp.h>
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#include <asm/trace.h>
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#include <asm/firmware.h>
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#include "plpar_wrappers.h"
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#include "pseries.h"
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/* in hvCall.S */
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EXPORT_SYMBOL(plpar_hcall);
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EXPORT_SYMBOL(plpar_hcall9);
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EXPORT_SYMBOL(plpar_hcall_norets);
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extern void pSeries_find_serial_port(void);
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void vpa_init(int cpu)
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{
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int hwcpu = get_hard_smp_processor_id(cpu);
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unsigned long addr;
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long ret;
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struct paca_struct *pp;
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struct dtl_entry *dtl;
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if (cpu_has_feature(CPU_FTR_ALTIVEC))
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lppaca_of(cpu).vmxregs_in_use = 1;
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addr = __pa(&lppaca_of(cpu));
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ret = register_vpa(hwcpu, addr);
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if (ret) {
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pr_err("WARNING: VPA registration for cpu %d (hw %d) of area "
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"%lx failed with %ld\n", cpu, hwcpu, addr, ret);
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return;
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}
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/*
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* PAPR says this feature is SLB-Buffer but firmware never
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* reports that. All SPLPAR support SLB shadow buffer.
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*/
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addr = __pa(&slb_shadow[cpu]);
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if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
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ret = register_slb_shadow(hwcpu, addr);
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if (ret)
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pr_err("WARNING: SLB shadow buffer registration for "
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"cpu %d (hw %d) of area %lx failed with %ld\n",
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cpu, hwcpu, addr, ret);
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}
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/*
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* Register dispatch trace log, if one has been allocated.
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*/
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pp = &paca[cpu];
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dtl = pp->dispatch_log;
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if (dtl) {
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pp->dtl_ridx = 0;
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pp->dtl_curr = dtl;
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lppaca_of(cpu).dtl_idx = 0;
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/* hypervisor reads buffer length from this field */
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dtl->enqueue_to_dispatch_time = DISPATCH_LOG_BYTES;
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ret = register_dtl(hwcpu, __pa(dtl));
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if (ret)
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pr_err("WARNING: DTL registration of cpu %d (hw %d) "
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"failed with %ld\n", smp_processor_id(),
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hwcpu, ret);
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lppaca_of(cpu).dtl_enable_mask = 2;
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}
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}
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static long pSeries_lpar_hpte_insert(unsigned long hpte_group,
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unsigned long vpn, unsigned long pa,
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unsigned long rflags, unsigned long vflags,
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int psize, int ssize)
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{
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unsigned long lpar_rc;
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unsigned long flags;
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unsigned long slot;
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unsigned long hpte_v, hpte_r;
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if (!(vflags & HPTE_V_BOLTED))
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pr_devel("hpte_insert(group=%lx, vpn=%016lx, "
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"pa=%016lx, rflags=%lx, vflags=%lx, psize=%d)\n",
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hpte_group, vpn, pa, rflags, vflags, psize);
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hpte_v = hpte_encode_v(vpn, psize, ssize) | vflags | HPTE_V_VALID;
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hpte_r = hpte_encode_r(pa, psize) | rflags;
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if (!(vflags & HPTE_V_BOLTED))
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pr_devel(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r);
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/* Now fill in the actual HPTE */
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/* Set CEC cookie to 0 */
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/* Zero page = 0 */
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/* I-cache Invalidate = 0 */
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/* I-cache synchronize = 0 */
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/* Exact = 0 */
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flags = 0;
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/* Make pHyp happy */
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if ((rflags & _PAGE_NO_CACHE) & !(rflags & _PAGE_WRITETHRU))
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hpte_r &= ~_PAGE_COHERENT;
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if (firmware_has_feature(FW_FEATURE_XCMO) && !(hpte_r & HPTE_R_N))
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flags |= H_COALESCE_CAND;
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lpar_rc = plpar_pte_enter(flags, hpte_group, hpte_v, hpte_r, &slot);
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if (unlikely(lpar_rc == H_PTEG_FULL)) {
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if (!(vflags & HPTE_V_BOLTED))
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pr_devel(" full\n");
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return -1;
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}
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/*
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* Since we try and ioremap PHBs we don't own, the pte insert
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* will fail. However we must catch the failure in hash_page
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* or we will loop forever, so return -2 in this case.
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*/
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if (unlikely(lpar_rc != H_SUCCESS)) {
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if (!(vflags & HPTE_V_BOLTED))
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pr_devel(" lpar err %lu\n", lpar_rc);
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return -2;
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}
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if (!(vflags & HPTE_V_BOLTED))
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pr_devel(" -> slot: %lu\n", slot & 7);
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/* Because of iSeries, we have to pass down the secondary
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* bucket bit here as well
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*/
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return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3);
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}
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static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock);
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static long pSeries_lpar_hpte_remove(unsigned long hpte_group)
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{
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unsigned long slot_offset;
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unsigned long lpar_rc;
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int i;
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unsigned long dummy1, dummy2;
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/* pick a random slot to start at */
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slot_offset = mftb() & 0x7;
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for (i = 0; i < HPTES_PER_GROUP; i++) {
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/* don't remove a bolted entry */
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lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset,
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(0x1UL << 4), &dummy1, &dummy2);
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if (lpar_rc == H_SUCCESS)
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return i;
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BUG_ON(lpar_rc != H_NOT_FOUND);
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slot_offset++;
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slot_offset &= 0x7;
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}
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return -1;
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}
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static void pSeries_lpar_hptab_clear(void)
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{
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unsigned long size_bytes = 1UL << ppc64_pft_size;
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unsigned long hpte_count = size_bytes >> 4;
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struct {
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unsigned long pteh;
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unsigned long ptel;
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} ptes[4];
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long lpar_rc;
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unsigned long i, j;
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/* Read in batches of 4,
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* invalidate only valid entries not in the VRMA
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* hpte_count will be a multiple of 4
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*/
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for (i = 0; i < hpte_count; i += 4) {
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lpar_rc = plpar_pte_read_4_raw(0, i, (void *)ptes);
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if (lpar_rc != H_SUCCESS)
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continue;
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for (j = 0; j < 4; j++){
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if ((ptes[j].pteh & HPTE_V_VRMA_MASK) ==
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HPTE_V_VRMA_MASK)
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continue;
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if (ptes[j].pteh & HPTE_V_VALID)
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plpar_pte_remove_raw(0, i + j, 0,
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&(ptes[j].pteh), &(ptes[j].ptel));
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}
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}
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}
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/*
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* NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and
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* the low 3 bits of flags happen to line up. So no transform is needed.
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* We can probably optimize here and assume the high bits of newpp are
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* already zero. For now I am paranoid.
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*/
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static long pSeries_lpar_hpte_updatepp(unsigned long slot,
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unsigned long newpp,
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unsigned long vpn,
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int psize, int ssize, int local)
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{
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unsigned long lpar_rc;
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unsigned long flags = (newpp & 7) | H_AVPN;
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unsigned long want_v;
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want_v = hpte_encode_avpn(vpn, psize, ssize);
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pr_devel(" update: avpnv=%016lx, hash=%016lx, f=%lx, psize: %d ...",
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want_v, slot, flags, psize);
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lpar_rc = plpar_pte_protect(flags, slot, want_v);
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if (lpar_rc == H_NOT_FOUND) {
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pr_devel("not found !\n");
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return -1;
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}
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pr_devel("ok\n");
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BUG_ON(lpar_rc != H_SUCCESS);
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return 0;
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}
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static unsigned long pSeries_lpar_hpte_getword0(unsigned long slot)
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{
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unsigned long dword0;
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unsigned long lpar_rc;
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unsigned long dummy_word1;
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unsigned long flags;
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/* Read 1 pte at a time */
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/* Do not need RPN to logical page translation */
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/* No cross CEC PFT access */
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flags = 0;
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lpar_rc = plpar_pte_read(flags, slot, &dword0, &dummy_word1);
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BUG_ON(lpar_rc != H_SUCCESS);
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return dword0;
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}
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static long pSeries_lpar_hpte_find(unsigned long vpn, int psize, int ssize)
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{
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unsigned long hash;
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unsigned long i;
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long slot;
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unsigned long want_v, hpte_v;
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hash = hpt_hash(vpn, mmu_psize_defs[psize].shift, ssize);
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want_v = hpte_encode_avpn(vpn, psize, ssize);
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/* Bolted entries are always in the primary group */
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slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
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for (i = 0; i < HPTES_PER_GROUP; i++) {
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hpte_v = pSeries_lpar_hpte_getword0(slot);
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if (HPTE_V_COMPARE(hpte_v, want_v) && (hpte_v & HPTE_V_VALID))
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/* HPTE matches */
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return slot;
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++slot;
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}
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return -1;
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}
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static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp,
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unsigned long ea,
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int psize, int ssize)
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{
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unsigned long vpn;
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unsigned long lpar_rc, slot, vsid, flags;
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vsid = get_kernel_vsid(ea, ssize);
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vpn = hpt_vpn(ea, vsid, ssize);
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slot = pSeries_lpar_hpte_find(vpn, psize, ssize);
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BUG_ON(slot == -1);
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flags = newpp & 7;
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lpar_rc = plpar_pte_protect(flags, slot, 0);
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BUG_ON(lpar_rc != H_SUCCESS);
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}
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static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long vpn,
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int psize, int ssize, int local)
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{
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unsigned long want_v;
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unsigned long lpar_rc;
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unsigned long dummy1, dummy2;
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pr_devel(" inval : slot=%lx, vpn=%016lx, psize: %d, local: %d\n",
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slot, vpn, psize, local);
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want_v = hpte_encode_avpn(vpn, psize, ssize);
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lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v, &dummy1, &dummy2);
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if (lpar_rc == H_NOT_FOUND)
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return;
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BUG_ON(lpar_rc != H_SUCCESS);
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}
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static void pSeries_lpar_hpte_removebolted(unsigned long ea,
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int psize, int ssize)
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{
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unsigned long vpn;
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unsigned long slot, vsid;
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vsid = get_kernel_vsid(ea, ssize);
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vpn = hpt_vpn(ea, vsid, ssize);
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slot = pSeries_lpar_hpte_find(vpn, psize, ssize);
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BUG_ON(slot == -1);
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pSeries_lpar_hpte_invalidate(slot, vpn, psize, ssize, 0);
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}
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/* Flag bits for H_BULK_REMOVE */
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#define HBR_REQUEST 0x4000000000000000UL
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#define HBR_RESPONSE 0x8000000000000000UL
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#define HBR_END 0xc000000000000000UL
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#define HBR_AVPN 0x0200000000000000UL
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#define HBR_ANDCOND 0x0100000000000000UL
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/*
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* Take a spinlock around flushes to avoid bouncing the hypervisor tlbie
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* lock.
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*/
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static void pSeries_lpar_flush_hash_range(unsigned long number, int local)
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{
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unsigned long vpn;
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unsigned long i, pix, rc;
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unsigned long flags = 0;
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struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch);
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int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE);
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unsigned long param[9];
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unsigned long hash, index, shift, hidx, slot;
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real_pte_t pte;
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int psize, ssize;
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if (lock_tlbie)
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spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
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psize = batch->psize;
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ssize = batch->ssize;
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pix = 0;
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for (i = 0; i < number; i++) {
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vpn = batch->vpn[i];
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pte = batch->pte[i];
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pte_iterate_hashed_subpages(pte, psize, vpn, index, shift) {
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hash = hpt_hash(vpn, shift, ssize);
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hidx = __rpte_to_hidx(pte, index);
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if (hidx & _PTEIDX_SECONDARY)
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hash = ~hash;
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slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
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slot += hidx & _PTEIDX_GROUP_IX;
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if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
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pSeries_lpar_hpte_invalidate(slot, vpn, psize,
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ssize, local);
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} else {
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param[pix] = HBR_REQUEST | HBR_AVPN | slot;
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param[pix+1] = hpte_encode_avpn(vpn, psize,
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ssize);
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pix += 2;
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if (pix == 8) {
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rc = plpar_hcall9(H_BULK_REMOVE, param,
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param[0], param[1], param[2],
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param[3], param[4], param[5],
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param[6], param[7]);
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BUG_ON(rc != H_SUCCESS);
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pix = 0;
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}
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}
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} pte_iterate_hashed_end();
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}
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if (pix) {
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param[pix] = HBR_END;
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rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1],
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param[2], param[3], param[4], param[5],
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param[6], param[7]);
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BUG_ON(rc != H_SUCCESS);
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}
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if (lock_tlbie)
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spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
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}
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static int __init disable_bulk_remove(char *str)
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{
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if (strcmp(str, "off") == 0 &&
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firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
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printk(KERN_INFO "Disabling BULK_REMOVE firmware feature");
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powerpc_firmware_features &= ~FW_FEATURE_BULK_REMOVE;
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}
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return 1;
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}
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__setup("bulk_remove=", disable_bulk_remove);
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void __init hpte_init_lpar(void)
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{
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ppc_md.hpte_invalidate = pSeries_lpar_hpte_invalidate;
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ppc_md.hpte_updatepp = pSeries_lpar_hpte_updatepp;
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ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp;
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ppc_md.hpte_insert = pSeries_lpar_hpte_insert;
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ppc_md.hpte_remove = pSeries_lpar_hpte_remove;
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ppc_md.hpte_removebolted = pSeries_lpar_hpte_removebolted;
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ppc_md.flush_hash_range = pSeries_lpar_flush_hash_range;
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ppc_md.hpte_clear_all = pSeries_lpar_hptab_clear;
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}
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#ifdef CONFIG_PPC_SMLPAR
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#define CMO_FREE_HINT_DEFAULT 1
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static int cmo_free_hint_flag = CMO_FREE_HINT_DEFAULT;
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static int __init cmo_free_hint(char *str)
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{
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char *parm;
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parm = strstrip(str);
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if (strcasecmp(parm, "no") == 0 || strcasecmp(parm, "off") == 0) {
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printk(KERN_INFO "cmo_free_hint: CMO free page hinting is not active.\n");
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cmo_free_hint_flag = 0;
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return 1;
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}
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cmo_free_hint_flag = 1;
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printk(KERN_INFO "cmo_free_hint: CMO free page hinting is active.\n");
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if (strcasecmp(parm, "yes") == 0 || strcasecmp(parm, "on") == 0)
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return 1;
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return 0;
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}
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__setup("cmo_free_hint=", cmo_free_hint);
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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
|
|
/*
|
|
* 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;
|
|
|
|
/*
|
|
* 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 hcall_tracepoint_regfunc(void)
|
|
{
|
|
hcall_tracepoint_refcount++;
|
|
}
|
|
|
|
void hcall_tracepoint_unregfunc(void)
|
|
{
|
|
hcall_tracepoint_refcount--;
|
|
}
|
|
|
|
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] & 0xffffffffffff;
|
|
|
|
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;
|
|
}
|