a6b53378f5
SBI defines a Debug Console extension "DBCN" that will, in time, replace the legacy console putchar and getchar SBI extensions. The appeal of the DBCN extension is that it allows multiple bytes to be read/written in the SBI console in a single SBI call. As far as KVM goes, the DBCN calls are forwarded by an in-kernel KVM module to userspace. But this will only happens if the KVM module actually supports this SBI extension and we activate it. We'll check for DBCN support during init time, checking if get-reg-list is advertising KVM_RISCV_SBI_EXT_DBCN. In that case, we'll enable it via kvm_set_one_reg() during kvm_arch_init_vcpu(). Finally, change kvm_riscv_handle_sbi() to handle the incoming calls for SBI_EXT_DBCN, reading and writing as required. A simple KVM guest with 'earlycon=sbi', running in an emulated RISC-V host, takes around 20 seconds to boot without using DBCN. With this patch we're taking around 14 seconds to boot due to the speed-up in the terminal output. There's no change in boot time if the guest isn't using earlycon. Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com> Reviewed-by: Andrew Jones <ajones@ventanamicro.com> Message-ID: <20240425155012.581366-1-dbarboza@ventanamicro.com> Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
90 lines
3.1 KiB
C
90 lines
3.1 KiB
C
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2019 Western Digital Corporation or its affiliates.
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*
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* Authors:
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* Anup Patel <anup.patel@wdc.com>
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*/
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#ifndef SBI_ECALL_INTERFACE_H
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#define SBI_ECALL_INTERFACE_H
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/* clang-format off */
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#define SBI_SUCCESS 0
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#define SBI_ERR_FAILED -1
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#define SBI_ERR_NOT_SUPPORTED -2
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#define SBI_ERR_INVALID_PARAM -3
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#define SBI_ERR_DENIED -4
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#define SBI_ERR_INVALID_ADDRESS -5
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#define SBI_ERR_ALREADY_AVAILABLE -6
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#define SBI_ERR_ALREADY_STARTED -7
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#define SBI_ERR_ALREADY_STOPPED -8
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#define SBI_ERR_NO_SHMEM -9
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/* SBI Extension IDs */
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#define SBI_EXT_0_1_SET_TIMER 0x0
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#define SBI_EXT_0_1_CONSOLE_PUTCHAR 0x1
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#define SBI_EXT_0_1_CONSOLE_GETCHAR 0x2
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#define SBI_EXT_0_1_CLEAR_IPI 0x3
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#define SBI_EXT_0_1_SEND_IPI 0x4
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#define SBI_EXT_0_1_REMOTE_FENCE_I 0x5
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#define SBI_EXT_0_1_REMOTE_SFENCE_VMA 0x6
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#define SBI_EXT_0_1_REMOTE_SFENCE_VMA_ASID 0x7
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#define SBI_EXT_0_1_SHUTDOWN 0x8
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#define SBI_EXT_BASE 0x10
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#define SBI_EXT_TIME 0x54494D45
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#define SBI_EXT_IPI 0x735049
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#define SBI_EXT_RFENCE 0x52464E43
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#define SBI_EXT_HSM 0x48534D
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#define SBI_EXT_DBCN 0x4442434E
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/* SBI function IDs for BASE extension */
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#define SBI_EXT_BASE_GET_SPEC_VERSION 0x0
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#define SBI_EXT_BASE_GET_IMP_ID 0x1
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#define SBI_EXT_BASE_GET_IMP_VERSION 0x2
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#define SBI_EXT_BASE_PROBE_EXT 0x3
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#define SBI_EXT_BASE_GET_MVENDORID 0x4
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#define SBI_EXT_BASE_GET_MARCHID 0x5
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#define SBI_EXT_BASE_GET_MIMPID 0x6
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/* SBI function IDs for TIME extension */
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#define SBI_EXT_TIME_SET_TIMER 0x0
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/* SBI function IDs for IPI extension */
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#define SBI_EXT_IPI_SEND_IPI 0x0
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/* SBI function IDs for RFENCE extension */
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#define SBI_EXT_RFENCE_REMOTE_FENCE_I 0x0
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#define SBI_EXT_RFENCE_REMOTE_SFENCE_VMA 0x1
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#define SBI_EXT_RFENCE_REMOTE_SFENCE_VMA_ASID 0x2
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#define SBI_EXT_RFENCE_REMOTE_HFENCE_GVMA 0x3
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#define SBI_EXT_RFENCE_REMOTE_HFENCE_GVMA_VMID 0x4
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#define SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA 0x5
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#define SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA_ASID 0x6
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/* SBI function IDs for HSM extension */
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#define SBI_EXT_HSM_HART_START 0x0
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#define SBI_EXT_HSM_HART_STOP 0x1
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#define SBI_EXT_HSM_HART_GET_STATUS 0x2
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/* SBI function IDs for DBCN extension */
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#define SBI_EXT_DBCN_CONSOLE_WRITE 0x0
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#define SBI_EXT_DBCN_CONSOLE_READ 0x1
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#define SBI_EXT_DBCN_CONSOLE_WRITE_BYTE 0x2
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#define SBI_HSM_HART_STATUS_STARTED 0x0
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#define SBI_HSM_HART_STATUS_STOPPED 0x1
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#define SBI_HSM_HART_STATUS_START_PENDING 0x2
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#define SBI_HSM_HART_STATUS_STOP_PENDING 0x3
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#define SBI_SPEC_VERSION_MAJOR_OFFSET 24
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#define SBI_SPEC_VERSION_MAJOR_MASK 0x7f
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#define SBI_SPEC_VERSION_MINOR_MASK 0xffffff
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#define SBI_EXT_VENDOR_START 0x09000000
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#define SBI_EXT_VENDOR_END 0x09FFFFFF
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/* clang-format on */
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#endif
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