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Date: Wed, 04 Dec 2019 10:52:03 -0800 (PST)
From: Palmer Dabbelt <palmerdabbelt@...gle.com>
To: Atish Patra <Atish.Patra@....com>
CC: linux-kernel@...r.kernel.org, Atish Patra <Atish.Patra@....com>,
anup@...infault.org, aou@...s.berkeley.edu,
alexios.zavras@...el.com, linux-riscv@...ts.infradead.org,
han_mao@...ky.com, rppt@...ux.ibm.com,
Paul Walmsley <paul.walmsley@...ive.com>, tglx@...utronix.de
Subject: Re: [PATCH v5 4/4] RISC-V: Implement new SBI v0.2 extensions
On Tue, 26 Nov 2019 11:05:03 PST (-0800), Atish Patra wrote:
> Few v0.1 SBI calls are being replaced by new SBI calls that follows
> v0.2 calling convention. The specification changes can be found at
>
> riscv/riscv-sbi-doc#27
>
> Implement the replacement extensions and few additional new SBI
> function calls that makes way for a better SBI interface in future.
>
> Signed-off-by: Atish Patra <atish.patra@....com>
> Reviewed-by: Anup Patel <anup@...infault.org>
> ---
> arch/riscv/include/asm/sbi.h | 35 ++++++
> arch/riscv/kernel/sbi.c | 208 +++++++++++++++++++++++++++++++++--
> 2 files changed, 236 insertions(+), 7 deletions(-)
>
> diff --git a/arch/riscv/include/asm/sbi.h b/arch/riscv/include/asm/sbi.h
> index cc82ae63f8e0..54ba9eebec11 100644
> --- a/arch/riscv/include/asm/sbi.h
> +++ b/arch/riscv/include/asm/sbi.h
> @@ -22,6 +22,9 @@ enum sbi_ext_id {
> SBI_EXT_0_1_SHUTDOWN = 0x8,
> #endif
> SBI_EXT_BASE = 0x10,
> + SBI_EXT_TIME = 0x54494D45,
> + SBI_EXT_IPI = 0x735049,
> + SBI_EXT_RFENCE = 0x52464E43,
> };
>
> enum sbi_ext_base_fid {
> @@ -34,6 +37,24 @@ enum sbi_ext_base_fid {
> SBI_BASE_GET_MIMPID,
> };
>
> +enum sbi_ext_time_fid {
> + SBI_EXT_TIME_SET_TIMER = 0,
> +};
> +
> +enum sbi_ext_ipi_fid {
> + SBI_EXT_IPI_SEND_IPI = 0,
> +};
> +
> +enum sbi_ext_rfence_fid {
> + SBI_EXT_RFENCE_REMOTE_FENCE_I = 0,
> + SBI_EXT_RFENCE_REMOTE_SFENCE_VMA,
> + SBI_EXT_RFENCE_REMOTE_SFENCE_VMA_ASID,
> + SBI_EXT_RFENCE_REMOTE_HFENCE_GVMA,
> + SBI_EXT_RFENCE_REMOTE_HFENCE_GVMA_VMID,
> + SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA,
> + SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA_ASID,
> +};
> +
> #define SBI_SPEC_VERSION_DEFAULT 0x1
> #define SBI_SPEC_VERSION_MAJOR_OFFSET 24
> #define SBI_SPEC_VERSION_MAJOR_MASK 0x7f
> @@ -74,6 +95,20 @@ void sbi_remote_sfence_vma_asid(const unsigned long *hart_mask,
> unsigned long start,
> unsigned long size,
> unsigned long asid);
> +int sbi_remote_hfence_gvma(const unsigned long *hart_mask,
> + unsigned long start,
> + unsigned long size);
> +int sbi_remote_hfence_gvma_vmid(const unsigned long *hart_mask,
> + unsigned long start,
> + unsigned long size,
> + unsigned long vmid);
> +int sbi_remote_hfence_vvma(const unsigned long *hart_mask,
> + unsigned long start,
> + unsigned long size);
> +int sbi_remote_hfence_vvma_asid(const unsigned long *hart_mask,
> + unsigned long start,
> + unsigned long size,
> + unsigned long asid);
> int sbi_probe_extension(long ext);
>
> /* Check if current SBI specification version is 0.1 or not */
> diff --git a/arch/riscv/kernel/sbi.c b/arch/riscv/kernel/sbi.c
> index ee710bfe0b0e..af3d5f8d8af7 100644
> --- a/arch/riscv/kernel/sbi.c
> +++ b/arch/riscv/kernel/sbi.c
> @@ -205,6 +205,101 @@ static int __sbi_rfence_v01(unsigned long ext, unsigned long fid,
> }
> #endif /* CONFIG_RISCV_SBI_V01 */
>
> +static void __sbi_set_timer_v02(uint64_t stime_value)
> +{
> +#if __riscv_xlen == 32
> + sbi_ecall(SBI_EXT_TIME, SBI_EXT_TIME_SET_TIMER, stime_value,
> + stime_value >> 32, 0, 0, 0, 0);
> +#else
> + sbi_ecall(SBI_EXT_TIME, SBI_EXT_TIME_SET_TIMER, stime_value, 0,
> + 0, 0, 0, 0);
> +#endif
> +}
> +
> +static int __sbi_send_ipi_v02(const unsigned long *hart_mask)
> +{
> + unsigned long hmask_val;
> + struct sbiret ret = {0};
> + int result;
> +
> + if (!hart_mask)
> + hmask_val = *(cpumask_bits(cpu_online_mask));
> + else
> + hmask_val = *hart_mask;
> +
> + ret = sbi_ecall(SBI_EXT_IPI, SBI_EXT_IPI_SEND_IPI, hmask_val,
> + 0, 0, 0, 0, 0);
> + if (ret.error) {
> + pr_err("%s: failed with error [%d]\n", __func__,
> + sbi_err_map_linux_errno(ret.error));
> + result = ret.error;
> + } else
> + result = ret.value;
> +
> + return result;
> +}
> +
> +static int __sbi_rfence_v02(unsigned long extid, unsigned long fid,
> + const unsigned long *hart_mask,
> + unsigned long hbase, unsigned long start,
> + unsigned long size, unsigned long arg4,
> + unsigned long arg5)
> +{
> + unsigned long hmask_val;
> + struct sbiret ret = {0};
> + int result;
> + unsigned long ext = SBI_EXT_RFENCE;
> +
> + if (!hart_mask)
> + hmask_val = *(cpumask_bits(cpu_online_mask));
This needs to map from CPUs to harts. Even if we're frobbing all of the harts
they might still be different.
> + else
> + hmask_val = *hart_mask;
> +
> + switch (fid) {
> + case SBI_EXT_RFENCE_REMOTE_FENCE_I:
> + ret = sbi_ecall(ext, fid, hmask_val, 0, 0, 0, 0, 0);
> + break;
> + case SBI_EXT_RFENCE_REMOTE_SFENCE_VMA:
> + ret = sbi_ecall(ext, fid, hmask_val, 0, start,
> + size, 0, 0);
> + break;
> + case SBI_EXT_RFENCE_REMOTE_SFENCE_VMA_ASID:
> + ret = sbi_ecall(ext, fid, hmask_val, 0, start,
> + size, arg4, 0);
> + break;
> + /*TODO: Handle non zero hbase cases */
> + case SBI_EXT_RFENCE_REMOTE_HFENCE_GVMA:
> + ret = sbi_ecall(ext, fid, hmask_val, 0, start,
> + size, 0, 0);
> + break;
> + case SBI_EXT_RFENCE_REMOTE_HFENCE_GVMA_VMID:
> + ret = sbi_ecall(ext, fid, hmask_val, 0, start,
> + size, arg4, 0);
> + break;
> + case SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA:
> + ret = sbi_ecall(ext, fid, hmask_val, 0, start,
> + size, 0, 0);
> + break;
> + case SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA_ASID:
> + ret = sbi_ecall(ext, fid, hmask_val, 0, start,
> + size, arg4, 0);
> + break;
> + default:
> + pr_err("unknown function ID [%lu] for SBI extension [%lu]\n",
> + fid, ext);
> + result = -EINVAL;
> + }
> +
> + if (ret.error) {
> + pr_err("%s: failed with error [%d]\n", __func__,
> + sbi_err_map_linux_errno(ret.error));
> + result = ret.error;
> + } else
> + result = ret.value;
> +
> + return result;
> +}
> +
> /**
> * sbi_set_timer() - Program the timer for next timer event.
> * @stime_value: The value after which next timer event should fire.
> @@ -237,7 +332,7 @@ EXPORT_SYMBOL(sbi_send_ipi);
> */
> void sbi_remote_fence_i(const unsigned long *hart_mask)
> {
> - __sbi_rfence(SBI_EXT_0_1_REMOTE_FENCE_I, 0,
> + __sbi_rfence(SBI_EXT_0_1_REMOTE_FENCE_I, SBI_EXT_RFENCE_REMOTE_FENCE_I,
> hart_mask, 0, 0, 0, 0, 0);
> }
> EXPORT_SYMBOL(sbi_remote_fence_i);
> @@ -255,7 +350,8 @@ void sbi_remote_sfence_vma(const unsigned long *hart_mask,
> unsigned long start,
> unsigned long size)
> {
> - __sbi_rfence(SBI_EXT_0_1_REMOTE_SFENCE_VMA, 0,
> + __sbi_rfence(SBI_EXT_0_1_REMOTE_SFENCE_VMA,
> + SBI_EXT_RFENCE_REMOTE_SFENCE_VMA,
> hart_mask, 0, start, size, 0, 0);
> }
> EXPORT_SYMBOL(sbi_remote_sfence_vma);
> @@ -276,11 +372,93 @@ void sbi_remote_sfence_vma_asid(const unsigned long *hart_mask,
> unsigned long size,
> unsigned long asid)
> {
> - __sbi_rfence(SBI_EXT_0_1_REMOTE_SFENCE_VMA_ASID, 0,
> + __sbi_rfence(SBI_EXT_0_1_REMOTE_SFENCE_VMA_ASID,
> + SBI_EXT_RFENCE_REMOTE_SFENCE_VMA_ASID,
> hart_mask, 0, start, size, asid, 0);
> }
> EXPORT_SYMBOL(sbi_remote_sfence_vma_asid);
>
> +/**
> + * sbi_remote_hfence_gvma() - Execute HFENCE.GVMA instructions on given remote
> + * harts for the specified guest physical address range.
> + * @hart_mask: A cpu mask containing all the target harts.
> + * @start: Start of the guest physical address
> + * @size: Total size of the guest physical address range.
> + *
> + * Return: None
> + */
> +int sbi_remote_hfence_gvma(const unsigned long *hart_mask,
> + unsigned long start,
> + unsigned long size)
> +{
> + return __sbi_rfence(SBI_EXT_RFENCE, SBI_EXT_RFENCE_REMOTE_HFENCE_GVMA,
> + hart_mask, 0, start, size, 0, 0);
> +}
> +EXPORT_SYMBOL_GPL(sbi_remote_hfence_gvma);
> +
> +/**
> + * sbi_remote_hfence_gvma_vmid() - Execute HFENCE.GVMA instructions on given
> + * remote harts for a guest physical address range belonging to a specific VMID.
> + *
> + * @hart_mask: A cpu mask containing all the target harts.
> + * @start: Start of the guest physical address
> + * @size: Total size of the guest physical address range.
> + * @vmid: The value of guest ID (VMID).
> + *
> + * Return: 0 if success, Error otherwise.
> + */
> +int sbi_remote_hfence_gvma_vmid(const unsigned long *hart_mask,
> + unsigned long start,
> + unsigned long size,
> + unsigned long vmid)
> +{
> + return __sbi_rfence(SBI_EXT_RFENCE,
> + SBI_EXT_RFENCE_REMOTE_HFENCE_GVMA_VMID,
> + hart_mask, 0, start, size, vmid, 0);
> +}
> +EXPORT_SYMBOL(sbi_remote_hfence_gvma_vmid);
> +
> +/**
> + * sbi_remote_hfence_vvma() - Execute HFENCE.VVMA instructions on given remote
> + * harts for the current guest virtual address range.
> + * @hart_mask: A cpu mask containing all the target harts.
> + * @start: Start of the current guest virtual address
> + * @size: Total size of the current guest virtual address range.
> + *
> + * Return: None
> + */
> +int sbi_remote_hfence_vvma(const unsigned long *hart_mask,
> + unsigned long start,
> + unsigned long size)
> +{
> + return __sbi_rfence(SBI_EXT_RFENCE, SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA,
> + hart_mask, 0, start, size, 0, 0);
> +}
> +EXPORT_SYMBOL(sbi_remote_hfence_vvma);
> +
> +/**
> + * sbi_remote_hfence_vvma_asid() - Execute HFENCE.VVMA instructions on given
> + * remote harts for current guest virtual address range belonging to a specific
> + * ASID.
> + *
> + * @hart_mask: A cpu mask containing all the target harts.
> + * @start: Start of the current guest virtual address
> + * @size: Total size of the current guest virtual address range.
> + * @asid: The value of address space identifier (ASID).
> + *
> + * Return: None
> + */
> +int sbi_remote_hfence_vvma_asid(const unsigned long *hart_mask,
> + unsigned long start,
> + unsigned long size,
> + unsigned long asid)
> +{
> + return __sbi_rfence(SBI_EXT_RFENCE,
> + SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA_ASID,
> + hart_mask, 0, start, size, asid, 0);
> +}
> +EXPORT_SYMBOL(sbi_remote_hfence_vvma_asid);
> +
> /**
> * sbi_probe_extension() - Check if an SBI extension ID is supported or not.
> * @extid: The extension ID to be probed.
> @@ -356,11 +534,27 @@ int __init sbi_init(void)
> if (!sbi_spec_is_0_1()) {
> pr_info("SBI implementation ID=0x%lx Version=0x%lx\n",
> sbi_get_firmware_id(), sbi_get_firmware_version());
> + if (sbi_probe_extension(SBI_EXT_TIME) > 0) {
> + __sbi_set_timer = __sbi_set_timer_v02;
> + pr_info("SBI v0.2 TIME extension detected\n");
> + } else
> + __sbi_set_timer = __sbi_set_timer_dummy_warn;
> + if (sbi_probe_extension(SBI_EXT_IPI) > 0) {
> + __sbi_send_ipi = __sbi_send_ipi_v02;
> + pr_info("SBI v0.2 IPI extension detected\n");
> + } else
> + __sbi_send_ipi = __sbi_send_ipi_dummy_warn;
> + if (sbi_probe_extension(SBI_EXT_RFENCE) > 0) {
> + __sbi_rfence = __sbi_rfence_v02;
> + pr_info("SBI v0.2 RFENCE extension detected\n");
> + } else
> + __sbi_rfence = __sbi_rfence_dummy_warn;
> +
> + } else {
> + __sbi_set_timer = __sbi_set_timer_v01;
> + __sbi_send_ipi = __sbi_send_ipi_v01;
> + __sbi_rfence = __sbi_rfence_v01;
> }
>
> - __sbi_set_timer = __sbi_set_timer_v01;
> - __sbi_send_ipi = __sbi_send_ipi_v01;
> - __sbi_rfence = __sbi_rfence_v01;
> -
> return 0;
> }
This will have to change around when disentangling the legacy vs v0.1 stuff.
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