mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-08-30 21:52:21 +00:00
ceb9155d05
Save and restore CSR.CNTC for hibernation which is similar to suspend. For host this is unnecessary because sched clock is ensured continuous, but for kvm guest sched clock isn't enough because rdtime.d should also be continuous. Host::rdtime.d = Host::CSR.CNTC + counter Guest::rdtime.d = Host::CSR.CNTC + Host::CSR.GCNTC + Guest::CSR.CNTC + counter so, Guest::rdtime.d = Host::rdtime.d + Host::CSR.GCNTC + Guest::CSR.CNTC To ensure Guest::rdtime.d continuous, Host::rdtime.d should be at first continuous, while Host::CSR.GCNTC / Guest::CSR.CNTC is maintained by KVM. Cc: stable@vger.kernel.org Signed-off-by: Xianglai Li <lixianglai@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
66 lines
1.5 KiB
C
66 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <asm/fpu.h>
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#include <asm/loongson.h>
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#include <asm/sections.h>
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#include <asm/time.h>
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#include <asm/tlbflush.h>
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#include <linux/suspend.h>
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static u32 saved_crmd;
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static u32 saved_prmd;
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static u32 saved_euen;
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static u32 saved_ecfg;
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static u64 saved_pcpu_base;
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struct pt_regs saved_regs;
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void save_processor_state(void)
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{
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save_counter();
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saved_crmd = csr_read32(LOONGARCH_CSR_CRMD);
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saved_prmd = csr_read32(LOONGARCH_CSR_PRMD);
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saved_euen = csr_read32(LOONGARCH_CSR_EUEN);
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saved_ecfg = csr_read32(LOONGARCH_CSR_ECFG);
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saved_pcpu_base = csr_read64(PERCPU_BASE_KS);
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if (is_fpu_owner())
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save_fp(current);
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}
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void restore_processor_state(void)
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{
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sync_counter();
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csr_write32(saved_crmd, LOONGARCH_CSR_CRMD);
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csr_write32(saved_prmd, LOONGARCH_CSR_PRMD);
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csr_write32(saved_euen, LOONGARCH_CSR_EUEN);
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csr_write32(saved_ecfg, LOONGARCH_CSR_ECFG);
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csr_write64(saved_pcpu_base, PERCPU_BASE_KS);
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if (is_fpu_owner())
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restore_fp(current);
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}
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int pfn_is_nosave(unsigned long pfn)
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{
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unsigned long nosave_begin_pfn = PFN_DOWN(__pa(&__nosave_begin));
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unsigned long nosave_end_pfn = PFN_UP(__pa(&__nosave_end));
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return (pfn >= nosave_begin_pfn) && (pfn < nosave_end_pfn);
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}
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extern int swsusp_asm_suspend(void);
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int swsusp_arch_suspend(void)
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{
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enable_pci_wakeup();
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return swsusp_asm_suspend();
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}
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extern int swsusp_asm_resume(void);
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int swsusp_arch_resume(void)
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{
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/* Avoid TLB mismatch during and after kernel resume */
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local_flush_tlb_all();
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return swsusp_asm_resume();
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}
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