| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * SBI initialilization and all extension implementation. |
| * |
| * Copyright (c) 2020 Western Digital Corporation or its affiliates. |
| */ |
| |
| #include <linux/init.h> |
| #include <linux/pm.h> |
| #include <asm/sbi.h> |
| #include <asm/smp.h> |
| |
| /* default SBI version is 0.1 */ |
| unsigned long sbi_spec_version = SBI_SPEC_VERSION_DEFAULT; |
| EXPORT_SYMBOL(sbi_spec_version); |
| |
| static void (*__sbi_set_timer)(uint64_t stime); |
| static int (*__sbi_send_ipi)(const unsigned long *hart_mask); |
| static int (*__sbi_rfence)(int fid, const unsigned long *hart_mask, |
| unsigned long start, unsigned long size, |
| unsigned long arg4, unsigned long arg5); |
| |
| struct sbiret sbi_ecall(int ext, int fid, unsigned long arg0, |
| unsigned long arg1, unsigned long arg2, |
| unsigned long arg3, unsigned long arg4, |
| unsigned long arg5) |
| { |
| struct sbiret ret; |
| |
| register uintptr_t a0 asm ("a0") = (uintptr_t)(arg0); |
| register uintptr_t a1 asm ("a1") = (uintptr_t)(arg1); |
| register uintptr_t a2 asm ("a2") = (uintptr_t)(arg2); |
| register uintptr_t a3 asm ("a3") = (uintptr_t)(arg3); |
| register uintptr_t a4 asm ("a4") = (uintptr_t)(arg4); |
| register uintptr_t a5 asm ("a5") = (uintptr_t)(arg5); |
| register uintptr_t a6 asm ("a6") = (uintptr_t)(fid); |
| register uintptr_t a7 asm ("a7") = (uintptr_t)(ext); |
| asm volatile ("ecall" |
| : "+r" (a0), "+r" (a1) |
| : "r" (a2), "r" (a3), "r" (a4), "r" (a5), "r" (a6), "r" (a7) |
| : "memory"); |
| ret.error = a0; |
| ret.value = a1; |
| |
| return ret; |
| } |
| EXPORT_SYMBOL(sbi_ecall); |
| |
| int sbi_err_map_linux_errno(int err) |
| { |
| switch (err) { |
| case SBI_SUCCESS: |
| return 0; |
| case SBI_ERR_DENIED: |
| return -EPERM; |
| case SBI_ERR_INVALID_PARAM: |
| return -EINVAL; |
| case SBI_ERR_INVALID_ADDRESS: |
| return -EFAULT; |
| case SBI_ERR_NOT_SUPPORTED: |
| case SBI_ERR_FAILURE: |
| default: |
| return -ENOTSUPP; |
| }; |
| } |
| EXPORT_SYMBOL(sbi_err_map_linux_errno); |
| |
| #ifdef CONFIG_RISCV_SBI_V01 |
| /** |
| * sbi_console_putchar() - Writes given character to the console device. |
| * @ch: The data to be written to the console. |
| * |
| * Return: None |
| */ |
| void sbi_console_putchar(int ch) |
| { |
| sbi_ecall(SBI_EXT_0_1_CONSOLE_PUTCHAR, 0, ch, 0, 0, 0, 0, 0); |
| } |
| EXPORT_SYMBOL(sbi_console_putchar); |
| |
| /** |
| * sbi_console_getchar() - Reads a byte from console device. |
| * |
| * Returns the value read from console. |
| */ |
| int sbi_console_getchar(void) |
| { |
| struct sbiret ret; |
| |
| ret = sbi_ecall(SBI_EXT_0_1_CONSOLE_GETCHAR, 0, 0, 0, 0, 0, 0, 0); |
| |
| return ret.error; |
| } |
| EXPORT_SYMBOL(sbi_console_getchar); |
| |
| /** |
| * sbi_shutdown() - Remove all the harts from executing supervisor code. |
| * |
| * Return: None |
| */ |
| void sbi_shutdown(void) |
| { |
| sbi_ecall(SBI_EXT_0_1_SHUTDOWN, 0, 0, 0, 0, 0, 0, 0); |
| } |
| EXPORT_SYMBOL(sbi_shutdown); |
| |
| /** |
| * sbi_clear_ipi() - Clear any pending IPIs for the calling hart. |
| * |
| * Return: None |
| */ |
| void sbi_clear_ipi(void) |
| { |
| sbi_ecall(SBI_EXT_0_1_CLEAR_IPI, 0, 0, 0, 0, 0, 0, 0); |
| } |
| EXPORT_SYMBOL(sbi_clear_ipi); |
| |
| /** |
| * sbi_set_timer_v01() - Program the timer for next timer event. |
| * @stime_value: The value after which next timer event should fire. |
| * |
| * Return: None |
| */ |
| static void __sbi_set_timer_v01(uint64_t stime_value) |
| { |
| #if __riscv_xlen == 32 |
| sbi_ecall(SBI_EXT_0_1_SET_TIMER, 0, stime_value, |
| stime_value >> 32, 0, 0, 0, 0); |
| #else |
| sbi_ecall(SBI_EXT_0_1_SET_TIMER, 0, stime_value, 0, 0, 0, 0, 0); |
| #endif |
| } |
| |
| static int __sbi_send_ipi_v01(const unsigned long *hart_mask) |
| { |
| sbi_ecall(SBI_EXT_0_1_SEND_IPI, 0, (unsigned long)hart_mask, |
| 0, 0, 0, 0, 0); |
| return 0; |
| } |
| |
| static int __sbi_rfence_v01(int fid, const unsigned long *hart_mask, |
| unsigned long start, unsigned long size, |
| unsigned long arg4, unsigned long arg5) |
| { |
| int result = 0; |
| |
| /* v0.2 function IDs are equivalent to v0.1 extension IDs */ |
| switch (fid) { |
| case SBI_EXT_RFENCE_REMOTE_FENCE_I: |
| sbi_ecall(SBI_EXT_0_1_REMOTE_FENCE_I, 0, |
| (unsigned long)hart_mask, 0, 0, 0, 0, 0); |
| break; |
| case SBI_EXT_RFENCE_REMOTE_SFENCE_VMA: |
| sbi_ecall(SBI_EXT_0_1_REMOTE_SFENCE_VMA, 0, |
| (unsigned long)hart_mask, start, size, |
| 0, 0, 0); |
| break; |
| case SBI_EXT_RFENCE_REMOTE_SFENCE_VMA_ASID: |
| sbi_ecall(SBI_EXT_0_1_REMOTE_SFENCE_VMA_ASID, 0, |
| (unsigned long)hart_mask, start, size, |
| arg4, 0, 0); |
| break; |
| default: |
| pr_err("SBI call [%d]not supported in SBI v0.1\n", fid); |
| result = -EINVAL; |
| } |
| |
| return result; |
| } |
| |
| static void sbi_set_power_off(void) |
| { |
| pm_power_off = sbi_shutdown; |
| } |
| #else |
| static void __sbi_set_timer_v01(uint64_t stime_value) |
| { |
| pr_warn("Timer extension is not available in SBI v%lu.%lu\n", |
| sbi_major_version(), sbi_minor_version()); |
| } |
| |
| static int __sbi_send_ipi_v01(const unsigned long *hart_mask) |
| { |
| pr_warn("IPI extension is not available in SBI v%lu.%lu\n", |
| sbi_major_version(), sbi_minor_version()); |
| |
| return 0; |
| } |
| |
| static int __sbi_rfence_v01(int fid, const unsigned long *hart_mask, |
| unsigned long start, unsigned long size, |
| unsigned long arg4, unsigned long arg5) |
| { |
| pr_warn("remote fence extension is not available in SBI v%lu.%lu\n", |
| sbi_major_version(), sbi_minor_version()); |
| |
| return 0; |
| } |
| |
| static void sbi_set_power_off(void) {} |
| #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 hartid, hmask_val, hbase; |
| struct cpumask tmask; |
| struct sbiret ret = {0}; |
| int result; |
| |
| if (!hart_mask || !(*hart_mask)) { |
| riscv_cpuid_to_hartid_mask(cpu_online_mask, &tmask); |
| hart_mask = cpumask_bits(&tmask); |
| } |
| |
| hmask_val = 0; |
| hbase = 0; |
| for_each_set_bit(hartid, hart_mask, NR_CPUS) { |
| if (hmask_val && ((hbase + BITS_PER_LONG) <= hartid)) { |
| ret = sbi_ecall(SBI_EXT_IPI, SBI_EXT_IPI_SEND_IPI, |
| hmask_val, hbase, 0, 0, 0, 0); |
| if (ret.error) |
| goto ecall_failed; |
| hmask_val = 0; |
| hbase = 0; |
| } |
| if (!hmask_val) |
| hbase = hartid; |
| hmask_val |= 1UL << (hartid - hbase); |
| } |
| |
| if (hmask_val) { |
| ret = sbi_ecall(SBI_EXT_IPI, SBI_EXT_IPI_SEND_IPI, |
| hmask_val, hbase, 0, 0, 0, 0); |
| if (ret.error) |
| goto ecall_failed; |
| } |
| |
| return 0; |
| |
| ecall_failed: |
| result = sbi_err_map_linux_errno(ret.error); |
| pr_err("%s: hbase = [%lu] hmask = [0x%lx] failed (error [%d])\n", |
| __func__, hbase, hmask_val, result); |
| return result; |
| } |
| |
| static int __sbi_rfence_v02_call(unsigned long fid, unsigned long hmask_val, |
| unsigned long hbase, unsigned long start, |
| unsigned long size, unsigned long arg4, |
| unsigned long arg5) |
| { |
| struct sbiret ret = {0}; |
| int ext = SBI_EXT_RFENCE; |
| int result = 0; |
| |
| switch (fid) { |
| case SBI_EXT_RFENCE_REMOTE_FENCE_I: |
| ret = sbi_ecall(ext, fid, hmask_val, hbase, 0, 0, 0, 0); |
| break; |
| case SBI_EXT_RFENCE_REMOTE_SFENCE_VMA: |
| ret = sbi_ecall(ext, fid, hmask_val, hbase, start, |
| size, 0, 0); |
| break; |
| case SBI_EXT_RFENCE_REMOTE_SFENCE_VMA_ASID: |
| ret = sbi_ecall(ext, fid, hmask_val, hbase, start, |
| size, arg4, 0); |
| break; |
| |
| case SBI_EXT_RFENCE_REMOTE_HFENCE_GVMA: |
| ret = sbi_ecall(ext, fid, hmask_val, hbase, start, |
| size, 0, 0); |
| break; |
| case SBI_EXT_RFENCE_REMOTE_HFENCE_GVMA_VMID: |
| ret = sbi_ecall(ext, fid, hmask_val, hbase, start, |
| size, arg4, 0); |
| break; |
| case SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA: |
| ret = sbi_ecall(ext, fid, hmask_val, hbase, start, |
| size, 0, 0); |
| break; |
| case SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA_ASID: |
| ret = sbi_ecall(ext, fid, hmask_val, hbase, start, |
| size, arg4, 0); |
| break; |
| default: |
| pr_err("unknown function ID [%lu] for SBI extension [%d]\n", |
| fid, ext); |
| result = -EINVAL; |
| } |
| |
| if (ret.error) { |
| result = sbi_err_map_linux_errno(ret.error); |
| pr_err("%s: hbase = [%lu] hmask = [0x%lx] failed (error [%d])\n", |
| __func__, hbase, hmask_val, result); |
| } |
| |
| return result; |
| } |
| |
| static int __sbi_rfence_v02(int fid, const unsigned long *hart_mask, |
| unsigned long start, unsigned long size, |
| unsigned long arg4, unsigned long arg5) |
| { |
| unsigned long hmask_val, hartid, hbase; |
| struct cpumask tmask; |
| int result; |
| |
| if (!hart_mask || !(*hart_mask)) { |
| riscv_cpuid_to_hartid_mask(cpu_online_mask, &tmask); |
| hart_mask = cpumask_bits(&tmask); |
| } |
| |
| hmask_val = 0; |
| hbase = 0; |
| for_each_set_bit(hartid, hart_mask, NR_CPUS) { |
| if (hmask_val && ((hbase + BITS_PER_LONG) <= hartid)) { |
| result = __sbi_rfence_v02_call(fid, hmask_val, hbase, |
| start, size, arg4, arg5); |
| if (result) |
| return result; |
| hmask_val = 0; |
| hbase = 0; |
| } |
| if (!hmask_val) |
| hbase = hartid; |
| hmask_val |= 1UL << (hartid - hbase); |
| } |
| |
| if (hmask_val) { |
| result = __sbi_rfence_v02_call(fid, hmask_val, hbase, |
| start, size, arg4, arg5); |
| if (result) |
| return result; |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * sbi_set_timer() - Program the timer for next timer event. |
| * @stime_value: The value after which next timer event should fire. |
| * |
| * Return: None |
| */ |
| void sbi_set_timer(uint64_t stime_value) |
| { |
| __sbi_set_timer(stime_value); |
| } |
| |
| /** |
| * sbi_send_ipi() - Send an IPI to any hart. |
| * @hart_mask: A cpu mask containing all the target harts. |
| * |
| * Return: None |
| */ |
| void sbi_send_ipi(const unsigned long *hart_mask) |
| { |
| __sbi_send_ipi(hart_mask); |
| } |
| EXPORT_SYMBOL(sbi_send_ipi); |
| |
| /** |
| * sbi_remote_fence_i() - Execute FENCE.I instruction on given remote harts. |
| * @hart_mask: A cpu mask containing all the target harts. |
| * |
| * Return: None |
| */ |
| void sbi_remote_fence_i(const unsigned long *hart_mask) |
| { |
| __sbi_rfence(SBI_EXT_RFENCE_REMOTE_FENCE_I, |
| hart_mask, 0, 0, 0, 0); |
| } |
| EXPORT_SYMBOL(sbi_remote_fence_i); |
| |
| /** |
| * sbi_remote_sfence_vma() - Execute SFENCE.VMA instructions on given remote |
| * harts for the specified virtual address range. |
| * @hart_mask: A cpu mask containing all the target harts. |
| * @start: Start of the virtual address |
| * @size: Total size of the virtual address range. |
| * |
| * Return: None |
| */ |
| void sbi_remote_sfence_vma(const unsigned long *hart_mask, |
| unsigned long start, |
| unsigned long size) |
| { |
| __sbi_rfence(SBI_EXT_RFENCE_REMOTE_SFENCE_VMA, |
| hart_mask, start, size, 0, 0); |
| } |
| EXPORT_SYMBOL(sbi_remote_sfence_vma); |
| |
| /** |
| * sbi_remote_sfence_vma_asid() - Execute SFENCE.VMA instructions on given |
| * remote harts for a virtual address range belonging to a specific ASID. |
| * |
| * @hart_mask: A cpu mask containing all the target harts. |
| * @start: Start of the virtual address |
| * @size: Total size of the virtual address range. |
| * @asid: The value of address space identifier (ASID). |
| * |
| * Return: None |
| */ |
| void sbi_remote_sfence_vma_asid(const unsigned long *hart_mask, |
| unsigned long start, |
| unsigned long size, |
| unsigned long asid) |
| { |
| __sbi_rfence(SBI_EXT_RFENCE_REMOTE_SFENCE_VMA_ASID, |
| hart_mask, 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_REMOTE_HFENCE_GVMA, |
| hart_mask, 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_REMOTE_HFENCE_GVMA_VMID, |
| hart_mask, 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_REMOTE_HFENCE_VVMA, |
| hart_mask, 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_REMOTE_HFENCE_VVMA_ASID, |
| hart_mask, 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. |
| * |
| * Return: Extension specific nonzero value f yes, -ENOTSUPP otherwise. |
| */ |
| int sbi_probe_extension(int extid) |
| { |
| struct sbiret ret; |
| |
| ret = sbi_ecall(SBI_EXT_BASE, SBI_EXT_BASE_PROBE_EXT, extid, |
| 0, 0, 0, 0, 0); |
| if (!ret.error) |
| if (ret.value) |
| return ret.value; |
| |
| return -ENOTSUPP; |
| } |
| EXPORT_SYMBOL(sbi_probe_extension); |
| |
| static long __sbi_base_ecall(int fid) |
| { |
| struct sbiret ret; |
| |
| ret = sbi_ecall(SBI_EXT_BASE, fid, 0, 0, 0, 0, 0, 0); |
| if (!ret.error) |
| return ret.value; |
| else |
| return sbi_err_map_linux_errno(ret.error); |
| } |
| |
| static inline long sbi_get_spec_version(void) |
| { |
| return __sbi_base_ecall(SBI_EXT_BASE_GET_SPEC_VERSION); |
| } |
| |
| static inline long sbi_get_firmware_id(void) |
| { |
| return __sbi_base_ecall(SBI_EXT_BASE_GET_IMP_ID); |
| } |
| |
| static inline long sbi_get_firmware_version(void) |
| { |
| return __sbi_base_ecall(SBI_EXT_BASE_GET_IMP_VERSION); |
| } |
| |
| |
| int __init sbi_init(void) |
| { |
| int ret; |
| |
| sbi_set_power_off(); |
| ret = sbi_get_spec_version(); |
| if (ret > 0) |
| sbi_spec_version = ret; |
| |
| pr_info("SBI specification v%lu.%lu detected\n", |
| sbi_major_version(), sbi_minor_version()); |
| |
| 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_v01; |
| } |
| 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_v01; |
| } |
| 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_v01; |
| } |
| } else { |
| __sbi_set_timer = __sbi_set_timer_v01; |
| __sbi_send_ipi = __sbi_send_ipi_v01; |
| __sbi_rfence = __sbi_rfence_v01; |
| } |
| |
| return 0; |
| } |