cregit-Linux how code gets into the kernel

Release 4.14 arch/powerpc/platforms/pseries/lpar.c

/*
 * 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 <linux/delay.h>
#include <linux/stop_machine.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 <asm/asm-prototypes.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; } #ifdef CONFIG_PPC_STD_MMU_64 /* * PAPR says this feature is SLB-Buffer but firmware never * reports that. All SPLPAR support SLB shadow buffer. */ if (!radix_enabled() && firmware_has_feature(FW_FEATURE_SPLPAR)) { addr = __pa(paca[cpu].slb_shadow_ptr); 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); } #endif /* CONFIG_PPC_STD_MMU_64 */ /* * 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; } }

Contributors

PersonTokensPropCommitsCommitProp
Paul Mackerras9636.36%218.18%
Anton Blanchard6022.73%327.27%
Michael Neuling4918.56%19.09%
Michael Ellerman259.47%218.18%
Aneesh Kumar K.V186.82%19.09%
Olof Johansson134.92%19.09%
Jeremy Kerr31.14%19.09%
Total264100.00%11100.00%

#ifdef CONFIG_PPC_STD_MMU_64
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; 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); }

Contributors

PersonTokensPropCommitsCommitProp
Benjamin Herrenschmidt10237.64%15.00%
Anton Blanchard8230.26%630.00%
David Gibson259.23%15.00%
Brian King186.64%15.00%
Aneesh Kumar K.V134.80%315.00%
Paul Mackerras114.06%210.00%
Andrew Morton103.69%15.00%
Michael Ellerman62.21%210.00%
Segher Boessenkool20.74%15.00%
Geoff Levand10.37%15.00%
Michael Hayes10.37%15.00%
Total271100.00%20100.00%

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; }

Contributors

PersonTokensPropCommitsCommitProp
Anton Blanchard9690.57%450.00%
Michael Wolf54.72%112.50%
Segher Boessenkool21.89%112.50%
Paul Mackerras21.89%112.50%
Michael Hayes10.94%112.50%
Total106100.00%8100.00%


static void manual_hpte_clear_all(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)); } } }

Contributors

PersonTokensPropCommitsCommitProp
Michael Neuling7747.83%114.29%
Benjamin Herrenschmidt5131.68%114.29%
Sachin P. Sant2716.77%114.29%
Anton Blanchard42.48%228.57%
M. Mohan Kumar10.62%114.29%
Stephen Rothwell10.62%114.29%
Total161100.00%7100.00%


static int hcall_hpte_clear_all(void) { int rc; do { rc = plpar_hcall_norets(H_CLEAR_HPT); } while (rc == H_CONTINUE); return rc; }

Contributors

PersonTokensPropCommitsCommitProp
Anton Blanchard31100.00%1100.00%
Total31100.00%1100.00%


static void pseries_hpte_clear_all(void) { int rc; rc = hcall_hpte_clear_all(); if (rc != H_SUCCESS) manual_hpte_clear_all(); #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()) pseries_big_endian_exceptions(); #endif }

Contributors

PersonTokensPropCommitsCommitProp
Anton Blanchard3986.67%250.00%
Hari Bathini511.11%125.00%
Sachin P. Sant12.22%125.00%
Total45100.00%4100.00%

/* * 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; 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); flags = (newpp & 7) | H_AVPN; if (mmu_has_feature(MMU_FTR_KERNEL_RO)) /* Move pp0 into bit 8 (IBM 55) */ flags |= (newpp & HPTE_R_PP0) >> 55; 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; }

Contributors

PersonTokensPropCommitsCommitProp
Anton Blanchard5942.75%428.57%
Benjamin Herrenschmidt3021.74%17.14%
Balbir Singh2820.29%17.14%
Aneesh Kumar K.V85.80%321.43%
Paul Mackerras75.07%214.29%
Michael Ellerman42.90%214.29%
Segher Boessenkool21.45%17.14%
Total138100.00%14100.00%


static long __pSeries_lpar_hpte_find(unsigned long want_v, unsigned long hpte_group) { long lpar_rc; unsigned long i, j; struct { unsigned long pteh; unsigned long ptel; } ptes[4]; for (i = 0; i < HPTES_PER_GROUP; i += 4, hpte_group += 4) { lpar_rc = plpar_pte_read_4(0, hpte_group, (void *)ptes); if (lpar_rc != H_SUCCESS) continue; for (j = 0; j < 4; j++) { if (HPTE_V_COMPARE(ptes[j].pteh, want_v) && (ptes[j].pteh & HPTE_V_VALID)) return i + j; } } return -1; }

Contributors

PersonTokensPropCommitsCommitProp
Aneesh Kumar K.V9673.85%125.00%
Anton Blanchard3325.38%250.00%
Segher Boessenkool10.77%125.00%
Total130100.00%4100.00%


static long pSeries_lpar_hpte_find(unsigned long vpn, int psize, int ssize) { long slot; unsigned long hash; unsigned long want_v; unsigned long hpte_group; 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 */ hpte_group = (hash & htab_hash_mask) * HPTES_PER_GROUP; slot = __pSeries_lpar_hpte_find(want_v, hpte_group); if (slot < 0) return -1; return hpte_group + slot; }

Contributors

PersonTokensPropCommitsCommitProp
Anton Blanchard4649.46%233.33%
Aneesh Kumar K.V2223.66%233.33%
Benjamin Herrenschmidt1617.20%116.67%
Paul Mackerras99.68%116.67%
Total93100.00%6100.00%


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; if (mmu_has_feature(MMU_FTR_KERNEL_RO)) /* Move pp0 into bit 8 (IBM 55) */ flags |= (newpp & HPTE_R_PP0) >> 55; lpar_rc = plpar_pte_protect(flags, slot, 0); BUG_ON(lpar_rc != H_SUCCESS); }

Contributors

PersonTokensPropCommitsCommitProp
Anton Blanchard6354.78%222.22%
Balbir Singh1815.65%111.11%
Paul Mackerras1815.65%333.33%
Benjamin Herrenschmidt86.96%111.11%
Aneesh Kumar K.V76.09%111.11%
Segher Boessenkool10.87%111.11%
Total115100.00%9100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
Anton Blanchard5861.05%330.00%
Benjamin Herrenschmidt1920.00%110.00%
Paul Mackerras88.42%220.00%
Aneesh Kumar K.V77.37%220.00%
Segher Boessenkool22.11%110.00%
Michael Ellerman11.05%110.00%
Total95100.00%10100.00%

#ifdef CONFIG_TRANSPARENT_HUGEPAGE /* * 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[PLPAR_HCALL9_BUFSIZE]; 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); }

Contributors

PersonTokensPropCommitsCommitProp
Aneesh Kumar K.V24780.98%215.38%
Anton Blanchard3411.15%323.08%
Paul Mackerras92.95%215.38%
Benjamin Herrenschmidt72.30%17.69%
Olof Johansson20.66%17.69%
Matt Evans20.66%17.69%
Andrew Morton20.66%17.69%
Geoff Levand10.33%17.69%
Laurent Dufour10.33%17.69%
Total305100.00%13100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
Aneesh Kumar K.V260100.00%3100.00%
Total260100.00%3100.00%

#else
static void pSeries_lpar_hugepage_invalidate(unsigned long vsid, unsigned long addr, unsigned char *hpte_slot_array, int psize, int ssize, int local) { WARN(1, "%s called without THP support\n", __func__); }

Contributors

PersonTokensPropCommitsCommitProp
Aneesh Kumar K.V37100.00%1100.00%
Total37100.00%1100.00%

#endif
static int 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); if (slot == -1) return -ENOENT; /* * lpar doesn't use the passed actual page size */ pSeries_lpar_hpte_invalidate(slot, vpn, psize, 0, ssize, 0); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Aneesh Kumar K.V7687.36%150.00%
David Gibson1112.64%150.00%
Total87100.00%2100.00%

/* * 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[PLPAR_HCALL9_BUFSIZE]; 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); }

Contributors

PersonTokensPropCommitsCommitProp
Paul Mackerras25461.65%321.43%
Aneesh Kumar K.V12730.83%321.43%
Anton Blanchard225.34%321.43%
Benjamin Herrenschmidt30.73%214.29%
Andrew Morton30.73%17.14%
Christoph Lameter20.49%17.14%
Laurent Dufour10.24%17.14%
Total412100.00%14100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Will Schmidt43100.00%1100.00%
Total43100.00%1100.00%

__setup("bulk_remove=", disable_bulk_remove); #define HPT_RESIZE_TIMEOUT 10000 /* ms */ struct hpt_resize_state { unsigned long shift; int commit_rc; };
static int pseries_lpar_resize_hpt_commit(void *data) { struct hpt_resize_state *state = data; state->commit_rc = plpar_resize_hpt_commit(0, state->shift); if (state->commit_rc != H_SUCCESS) return -EIO; /* Hypervisor has transitioned the HTAB, update our globals */ ppc64_pft_size = state->shift; htab_size_bytes = 1UL << ppc64_pft_size; htab_hash_mask = (htab_size_bytes >> 7) - 1; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
David Gibson68100.00%1100.00%
Total68100.00%1100.00%

/* Must be called in user context */
static int pseries_lpar_resize_hpt(unsigned long shift) { struct hpt_resize_state state = { .shift = shift, .commit_rc = H_FUNCTION, }; unsigned int delay, total_delay = 0; int rc; ktime_t t0, t1, t2; might_sleep(); if (!firmware_has_feature(FW_FEATURE_HPT_RESIZE)) return -ENODEV; printk(KERN_INFO "lpar: Attempting to resize HPT to shift %lu\n", shift); t0 = ktime_get(); rc = plpar_resize_hpt_prepare(0, shift); while (H_IS_LONG_BUSY(rc)) { delay = get_longbusy_msecs(rc); total_delay += delay; if (total_delay > HPT_RESIZE_TIMEOUT) { /* prepare with shift==0 cancels an in-progress resize */ rc = plpar_resize_hpt_prepare(