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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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41f4e631da
This pulls out the assembler code that is responsible for saving and restoring the PMU state for the host and guest into separate functions so they can be used from an alternate entry path. The calling convention is made compatible with C. Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Paul Mackerras <paulus@ozlabs.org> Reviewed-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
167 lines
4.3 KiB
ArmAsm
167 lines
4.3 KiB
ArmAsm
/*
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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, version 2, as
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* published by the Free Software Foundation.
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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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Copyright 2011 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
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*
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* Derived from book3s_interrupts.S, which is:
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* Copyright SUSE Linux Products GmbH 2009
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*
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* Authors: Alexander Graf <agraf@suse.de>
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*/
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#include <asm/ppc_asm.h>
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#include <asm/kvm_asm.h>
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#include <asm/reg.h>
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#include <asm/page.h>
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#include <asm/asm-offsets.h>
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#include <asm/exception-64s.h>
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#include <asm/ppc-opcode.h>
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#include <asm/asm-compat.h>
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#include <asm/feature-fixups.h>
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/*****************************************************************************
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* *
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* Guest entry / exit code that is in kernel module memory (vmalloc) *
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* *
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****************************************************************************/
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/* Registers:
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* none
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*/
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_GLOBAL(__kvmppc_vcore_entry)
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/* Write correct stack frame */
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mflr r0
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std r0,PPC_LR_STKOFF(r1)
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/* Save host state to the stack */
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stdu r1, -SWITCH_FRAME_SIZE(r1)
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/* Save non-volatile registers (r14 - r31) and CR */
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SAVE_NVGPRS(r1)
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mfcr r3
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std r3, _CCR(r1)
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/* Save host DSCR */
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mfspr r3, SPRN_DSCR
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std r3, HSTATE_DSCR(r13)
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BEGIN_FTR_SECTION
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/* Save host DABR */
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mfspr r3, SPRN_DABR
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std r3, HSTATE_DABR(r13)
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END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S)
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/* Save host PMU registers */
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bl kvmhv_save_host_pmu
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/*
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* Put whatever is in the decrementer into the
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* hypervisor decrementer.
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*/
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BEGIN_FTR_SECTION
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ld r5, HSTATE_KVM_VCORE(r13)
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ld r6, VCORE_KVM(r5)
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ld r9, KVM_HOST_LPCR(r6)
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andis. r9, r9, LPCR_LD@h
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END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300)
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mfspr r8,SPRN_DEC
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mftb r7
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BEGIN_FTR_SECTION
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/* On POWER9, don't sign-extend if host LPCR[LD] bit is set */
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bne 32f
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END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300)
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extsw r8,r8
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32: mtspr SPRN_HDEC,r8
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add r8,r8,r7
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std r8,HSTATE_DECEXP(r13)
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/* Jump to partition switch code */
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bl kvmppc_hv_entry_trampoline
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nop
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/*
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* We return here in virtual mode after the guest exits
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* with something that we can't handle in real mode.
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* Interrupts are still hard-disabled.
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*/
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/*
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* Register usage at this point:
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*
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* R1 = host R1
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* R2 = host R2
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* R3 = trap number on this thread
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* R12 = exit handler id
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* R13 = PACA
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*/
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/* Restore non-volatile host registers (r14 - r31) and CR */
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REST_NVGPRS(r1)
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ld r4, _CCR(r1)
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mtcr r4
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addi r1, r1, SWITCH_FRAME_SIZE
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ld r0, PPC_LR_STKOFF(r1)
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mtlr r0
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blr
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_GLOBAL(kvmhv_save_host_pmu)
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BEGIN_FTR_SECTION
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/* Work around P8 PMAE bug */
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li r3, -1
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clrrdi r3, r3, 10
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mfspr r8, SPRN_MMCR2
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mtspr SPRN_MMCR2, r3 /* freeze all counters using MMCR2 */
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isync
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END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
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li r3, 1
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sldi r3, r3, 31 /* MMCR0_FC (freeze counters) bit */
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mfspr r7, SPRN_MMCR0 /* save MMCR0 */
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mtspr SPRN_MMCR0, r3 /* freeze all counters, disable interrupts */
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mfspr r6, SPRN_MMCRA
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/* Clear MMCRA in order to disable SDAR updates */
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li r5, 0
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mtspr SPRN_MMCRA, r5
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isync
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lbz r5, PACA_PMCINUSE(r13) /* is the host using the PMU? */
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cmpwi r5, 0
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beq 31f /* skip if not */
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mfspr r5, SPRN_MMCR1
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mfspr r9, SPRN_SIAR
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mfspr r10, SPRN_SDAR
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std r7, HSTATE_MMCR0(r13)
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std r5, HSTATE_MMCR1(r13)
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std r6, HSTATE_MMCRA(r13)
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std r9, HSTATE_SIAR(r13)
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std r10, HSTATE_SDAR(r13)
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BEGIN_FTR_SECTION
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mfspr r9, SPRN_SIER
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std r8, HSTATE_MMCR2(r13)
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std r9, HSTATE_SIER(r13)
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END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
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mfspr r3, SPRN_PMC1
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mfspr r5, SPRN_PMC2
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mfspr r6, SPRN_PMC3
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mfspr r7, SPRN_PMC4
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mfspr r8, SPRN_PMC5
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mfspr r9, SPRN_PMC6
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stw r3, HSTATE_PMC1(r13)
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stw r5, HSTATE_PMC2(r13)
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stw r6, HSTATE_PMC3(r13)
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stw r7, HSTATE_PMC4(r13)
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stw r8, HSTATE_PMC5(r13)
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stw r9, HSTATE_PMC6(r13)
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31: blr
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