diff options
Diffstat (limited to 'arch/riscv/kernel/sbi.c')
| -rw-r--r-- | arch/riscv/kernel/sbi.c | 509 |
1 files changed, 300 insertions, 209 deletions
diff --git a/arch/riscv/kernel/sbi.c b/arch/riscv/kernel/sbi.c index 7402a417f38e..c443337056ab 100644 --- a/arch/riscv/kernel/sbi.c +++ b/arch/riscv/kernel/sbi.c @@ -5,67 +5,50 @@ * Copyright (c) 2020 Western Digital Corporation or its affiliates. */ +#include <linux/bits.h> #include <linux/init.h> +#include <linux/mm.h> #include <linux/pm.h> +#include <linux/reboot.h> #include <asm/sbi.h> #include <asm/smp.h> +#include <asm/tlbflush.h> /* default SBI version is 0.1 */ unsigned long sbi_spec_version __ro_after_init = SBI_SPEC_VERSION_DEFAULT; EXPORT_SYMBOL(sbi_spec_version); static void (*__sbi_set_timer)(uint64_t stime) __ro_after_init; -static int (*__sbi_send_ipi)(const unsigned long *hart_mask) __ro_after_init; -static int (*__sbi_rfence)(int fid, const unsigned long *hart_mask, +static void (*__sbi_send_ipi)(unsigned int cpu) __ro_after_init; +static int (*__sbi_rfence)(int fid, const struct cpumask *cpu_mask, unsigned long start, unsigned long size, unsigned long arg4, unsigned long arg5) __ro_after_init; -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; +#ifdef CONFIG_RISCV_SBI_V01 +static unsigned long __sbi_v01_cpumask_to_hartmask(const struct cpumask *cpu_mask) +{ + unsigned long cpuid, hartid; + unsigned long hmask = 0; + + /* + * There is no maximum hartid concept in RISC-V and NR_CPUS must not be + * associated with hartid. As SBI v0.1 is only kept for backward compatibility + * and will be removed in the future, there is no point in supporting hartid + * greater than BITS_PER_LONG (32 for RV32 and 64 for RV64). Ideally, SBI v0.2 + * should be used for platforms with hartid greater than BITS_PER_LONG. + */ + for_each_cpu(cpuid, cpu_mask) { + hartid = cpuid_to_hartid_map(cpuid); + if (hartid >= BITS_PER_LONG) { + pr_warn("Unable to send any request to hartid > BITS_PER_LONG for SBI v0.1\n"); + break; + } + hmask |= BIT(hartid); + } - 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; - }; + return hmask; } -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. @@ -105,17 +88,6 @@ void sbi_shutdown(void) 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. * @@ -131,33 +103,39 @@ static void __sbi_set_timer_v01(uint64_t stime_value) #endif } -static int __sbi_send_ipi_v01(const unsigned long *hart_mask) +static void __sbi_send_ipi_v01(unsigned int cpu) { - sbi_ecall(SBI_EXT_0_1_SEND_IPI, 0, (unsigned long)hart_mask, + unsigned long hart_mask = + __sbi_v01_cpumask_to_hartmask(cpumask_of(cpu)); + 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, +static int __sbi_rfence_v01(int fid, const struct cpumask *cpu_mask, unsigned long start, unsigned long size, unsigned long arg4, unsigned long arg5) { int result = 0; + unsigned long hart_mask; + + if (!cpu_mask || cpumask_empty(cpu_mask)) + cpu_mask = cpu_online_mask; + hart_mask = __sbi_v01_cpumask_to_hartmask(cpu_mask); /* 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); + (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, + (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, + (unsigned long)&hart_mask, start, size, arg4, 0, 0); break; default: @@ -170,7 +148,7 @@ static int __sbi_rfence_v01(int fid, const unsigned long *hart_mask, static void sbi_set_power_off(void) { - pm_power_off = sbi_shutdown; + register_platform_power_off(sbi_shutdown); } #else static void __sbi_set_timer_v01(uint64_t stime_value) @@ -179,15 +157,13 @@ static void __sbi_set_timer_v01(uint64_t stime_value) sbi_major_version(), sbi_minor_version()); } -static int __sbi_send_ipi_v01(const unsigned long *hart_mask) +static void __sbi_send_ipi_v01(unsigned int cpu) { 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, +static int __sbi_rfence_v01(int fid, const struct cpumask *cpu_mask, unsigned long start, unsigned long size, unsigned long arg4, unsigned long arg5) { @@ -211,51 +187,21 @@ static void __sbi_set_timer_v02(uint64_t stime_value) #endif } -static int __sbi_send_ipi_v02(const unsigned long *hart_mask) +static void __sbi_send_ipi_v02(unsigned int cpu) { - unsigned long hartid, hmask_val, hbase; - struct cpumask tmask; - struct sbiret ret = {0}; int result; + struct sbiret ret = {0}; - 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; + ret = sbi_ecall(SBI_EXT_IPI, SBI_EXT_IPI_SEND_IPI, + 1UL, cpuid_to_hartid_map(cpu), 0, 0, 0, 0); + if (ret.error) { + result = sbi_err_map_linux_errno(ret.error); + pr_err("%s: hbase = [%lu] failed (error [%d])\n", + __func__, cpuid_to_hartid_map(cpu), result); } - - 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, +static int __sbi_rfence_v02_call(unsigned long fid, unsigned long hmask, unsigned long hbase, unsigned long start, unsigned long size, unsigned long arg4, unsigned long arg5) @@ -266,31 +212,31 @@ static int __sbi_rfence_v02_call(unsigned long fid, unsigned long hmask_val, switch (fid) { case SBI_EXT_RFENCE_REMOTE_FENCE_I: - ret = sbi_ecall(ext, fid, hmask_val, hbase, 0, 0, 0, 0); + ret = sbi_ecall(ext, fid, hmask, hbase, 0, 0, 0, 0); break; case SBI_EXT_RFENCE_REMOTE_SFENCE_VMA: - ret = sbi_ecall(ext, fid, hmask_val, hbase, start, + ret = sbi_ecall(ext, fid, hmask, hbase, start, size, 0, 0); break; case SBI_EXT_RFENCE_REMOTE_SFENCE_VMA_ASID: - ret = sbi_ecall(ext, fid, hmask_val, hbase, start, + ret = sbi_ecall(ext, fid, hmask, hbase, start, size, arg4, 0); break; case SBI_EXT_RFENCE_REMOTE_HFENCE_GVMA: - ret = sbi_ecall(ext, fid, hmask_val, hbase, start, + ret = sbi_ecall(ext, fid, hmask, hbase, start, size, 0, 0); break; case SBI_EXT_RFENCE_REMOTE_HFENCE_GVMA_VMID: - ret = sbi_ecall(ext, fid, hmask_val, hbase, start, + ret = sbi_ecall(ext, fid, hmask, hbase, start, size, arg4, 0); break; case SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA: - ret = sbi_ecall(ext, fid, hmask_val, hbase, start, + ret = sbi_ecall(ext, fid, hmask, hbase, start, size, 0, 0); break; case SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA_ASID: - ret = sbi_ecall(ext, fid, hmask_val, hbase, start, + ret = sbi_ecall(ext, fid, hmask, hbase, start, size, arg4, 0); break; default: @@ -302,43 +248,49 @@ static int __sbi_rfence_v02_call(unsigned long fid, unsigned long hmask_val, 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); + __func__, hbase, hmask, result); } return result; } -static int __sbi_rfence_v02(int fid, const unsigned long *hart_mask, +static int __sbi_rfence_v02(int fid, const struct cpumask *cpu_mask, unsigned long start, unsigned long size, unsigned long arg4, unsigned long arg5) { - unsigned long hmask_val, hartid, hbase; - struct cpumask tmask; + unsigned long hartid, cpuid, hmask = 0, hbase = 0, htop = 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)) { - result = __sbi_rfence_v02_call(fid, hmask_val, hbase, - start, size, arg4, arg5); - if (result) - return result; - hmask_val = 0; - hbase = 0; + if (!cpu_mask || cpumask_empty(cpu_mask)) + cpu_mask = cpu_online_mask; + + for_each_cpu(cpuid, cpu_mask) { + hartid = cpuid_to_hartid_map(cpuid); + if (hmask) { + if (hartid + BITS_PER_LONG <= htop || + hbase + BITS_PER_LONG <= hartid) { + result = __sbi_rfence_v02_call(fid, hmask, + hbase, start, size, arg4, arg5); + if (result) + return result; + hmask = 0; + } else if (hartid < hbase) { + /* shift the mask to fit lower hartid */ + hmask <<= hbase - hartid; + hbase = hartid; + } } - if (!hmask_val) + if (!hmask) { hbase = hartid; - hmask_val |= 1UL << (hartid - hbase); + htop = hartid; + } else if (hartid > htop) { + htop = hartid; + } + hmask |= BIT(hartid - hbase); } - if (hmask_val) { - result = __sbi_rfence_v02_call(fid, hmask_val, hbase, + if (hmask) { + result = __sbi_rfence_v02_call(fid, hmask, hbase, start, size, arg4, arg5); if (result) return result; @@ -347,6 +299,76 @@ static int __sbi_rfence_v02(int fid, const unsigned long *hart_mask, return 0; } +static bool sbi_fwft_supported; + +struct fwft_set_req { + u32 feature; + unsigned long value; + unsigned long flags; + atomic_t error; +}; + +static void cpu_sbi_fwft_set(void *arg) +{ + struct fwft_set_req *req = arg; + int ret; + + ret = sbi_fwft_set(req->feature, req->value, req->flags); + if (ret) + atomic_set(&req->error, ret); +} + +/** + * sbi_fwft_set() - Set a feature on the local hart + * @feature: The feature ID to be set + * @value: The feature value to be set + * @flags: FWFT feature set flags + * + * Return: 0 on success, appropriate linux error code otherwise. + */ +int sbi_fwft_set(u32 feature, unsigned long value, unsigned long flags) +{ + struct sbiret ret; + + if (!sbi_fwft_supported) + return -EOPNOTSUPP; + + ret = sbi_ecall(SBI_EXT_FWFT, SBI_EXT_FWFT_SET, + feature, value, flags, 0, 0, 0); + + return sbi_err_map_linux_errno(ret.error); +} + +/** + * sbi_fwft_set_cpumask() - Set a feature for the specified cpumask + * @mask: CPU mask of cpus that need the feature to be set + * @feature: The feature ID to be set + * @value: The feature value to be set + * @flags: FWFT feature set flags + * + * Return: 0 on success, appropriate linux error code otherwise. + */ +int sbi_fwft_set_cpumask(const cpumask_t *mask, u32 feature, + unsigned long value, unsigned long flags) +{ + struct fwft_set_req req = { + .feature = feature, + .value = value, + .flags = flags, + .error = ATOMIC_INIT(0), + }; + + if (!sbi_fwft_supported) + return -EOPNOTSUPP; + + if (feature & SBI_FWFT_GLOBAL_FEATURE_BIT) + return -EINVAL; + + on_each_cpu_mask(mask, cpu_sbi_fwft_set, &req, 1); + + return atomic_read(&req.error); +} + /** * sbi_set_timer() - Program the timer for next timer event. * @stime_value: The value after which next timer event should fire. @@ -360,83 +382,68 @@ void sbi_set_timer(uint64_t stime_value) /** * sbi_send_ipi() - Send an IPI to any hart. - * @hart_mask: A cpu mask containing all the target harts. - * - * Return: 0 on success, appropriate linux error code otherwise. + * @cpu: Logical id of the target CPU. */ -int sbi_send_ipi(const unsigned long *hart_mask) +void sbi_send_ipi(unsigned int cpu) { - return __sbi_send_ipi(hart_mask); + __sbi_send_ipi(cpu); } 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. + * @cpu_mask: A cpu mask containing all the target harts. * * Return: 0 on success, appropriate linux error code otherwise. */ -int sbi_remote_fence_i(const unsigned long *hart_mask) +int sbi_remote_fence_i(const struct cpumask *cpu_mask) { return __sbi_rfence(SBI_EXT_RFENCE_REMOTE_FENCE_I, - hart_mask, 0, 0, 0, 0); + cpu_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: 0 on success, appropriate linux error code otherwise. - */ -int sbi_remote_sfence_vma(const unsigned long *hart_mask, - unsigned long start, - unsigned long size) -{ - return __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. + * remote harts for a virtual address range belonging to a specific ASID or not. * - * @hart_mask: A cpu mask containing all the target harts. + * @cpu_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). + * @asid: The value of address space identifier (ASID), or FLUSH_TLB_NO_ASID + * for flushing all address spaces. * * Return: 0 on success, appropriate linux error code otherwise. */ -int sbi_remote_sfence_vma_asid(const unsigned long *hart_mask, +int sbi_remote_sfence_vma_asid(const struct cpumask *cpu_mask, unsigned long start, unsigned long size, unsigned long asid) { - return __sbi_rfence(SBI_EXT_RFENCE_REMOTE_SFENCE_VMA_ASID, - hart_mask, start, size, asid, 0); + if (asid == FLUSH_TLB_NO_ASID) + return __sbi_rfence(SBI_EXT_RFENCE_REMOTE_SFENCE_VMA, + cpu_mask, start, size, 0, 0); + else + return __sbi_rfence(SBI_EXT_RFENCE_REMOTE_SFENCE_VMA_ASID, + cpu_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. + * @cpu_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, +int sbi_remote_hfence_gvma(const struct cpumask *cpu_mask, unsigned long start, unsigned long size) { return __sbi_rfence(SBI_EXT_RFENCE_REMOTE_HFENCE_GVMA, - hart_mask, start, size, 0, 0); + cpu_mask, start, size, 0, 0); } EXPORT_SYMBOL_GPL(sbi_remote_hfence_gvma); @@ -444,38 +451,38 @@ 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. + * @cpu_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, +int sbi_remote_hfence_gvma_vmid(const struct cpumask *cpu_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); + cpu_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. + * @cpu_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, +int sbi_remote_hfence_vvma(const struct cpumask *cpu_mask, unsigned long start, unsigned long size) { return __sbi_rfence(SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA, - hart_mask, start, size, 0, 0); + cpu_mask, start, size, 0, 0); } EXPORT_SYMBOL(sbi_remote_hfence_vvma); @@ -484,54 +491,68 @@ EXPORT_SYMBOL(sbi_remote_hfence_vvma); * remote harts for current guest virtual address range belonging to a specific * ASID. * - * @hart_mask: A cpu mask containing all the target harts. + * @cpu_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, +int sbi_remote_hfence_vvma_asid(const struct cpumask *cpu_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); + cpu_mask, start, size, asid, 0); } EXPORT_SYMBOL(sbi_remote_hfence_vvma_asid); +static void sbi_srst_reset(unsigned long type, unsigned long reason) +{ + sbi_ecall(SBI_EXT_SRST, SBI_EXT_SRST_RESET, type, reason, + 0, 0, 0, 0); + pr_warn("%s: type=0x%lx reason=0x%lx failed\n", + __func__, type, reason); +} + +static int sbi_srst_reboot(struct notifier_block *this, + unsigned long mode, void *cmd) +{ + sbi_srst_reset((mode == REBOOT_WARM || mode == REBOOT_SOFT) ? + SBI_SRST_RESET_TYPE_WARM_REBOOT : + SBI_SRST_RESET_TYPE_COLD_REBOOT, + SBI_SRST_RESET_REASON_NONE); + return NOTIFY_DONE; +} + +static struct notifier_block sbi_srst_reboot_nb; + +static void sbi_srst_power_off(void) +{ + sbi_srst_reset(SBI_SRST_RESET_TYPE_SHUTDOWN, + SBI_SRST_RESET_REASON_NONE); +} + /** * 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. + * Return: 1 or an extension specific nonzero value if yes, 0 otherwise. */ -int sbi_probe_extension(int extid) +long 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 ret.value; - return -ENOTSUPP; + return 0; } 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); @@ -551,35 +572,85 @@ long sbi_get_mvendorid(void) { return __sbi_base_ecall(SBI_EXT_BASE_GET_MVENDORID); } +EXPORT_SYMBOL_GPL(sbi_get_mvendorid); long sbi_get_marchid(void) { return __sbi_base_ecall(SBI_EXT_BASE_GET_MARCHID); } +EXPORT_SYMBOL_GPL(sbi_get_marchid); long sbi_get_mimpid(void) { return __sbi_base_ecall(SBI_EXT_BASE_GET_MIMPID); } +EXPORT_SYMBOL_GPL(sbi_get_mimpid); + +bool sbi_debug_console_available; -static void sbi_send_cpumask_ipi(const struct cpumask *target) +int sbi_debug_console_write(const char *bytes, unsigned int num_bytes) { - struct cpumask hartid_mask; + phys_addr_t base_addr; + struct sbiret ret; - riscv_cpuid_to_hartid_mask(target, &hartid_mask); + if (!sbi_debug_console_available) + return -EOPNOTSUPP; - sbi_send_ipi(cpumask_bits(&hartid_mask)); + if (is_vmalloc_addr(bytes)) + base_addr = page_to_phys(vmalloc_to_page(bytes)) + + offset_in_page(bytes); + else + base_addr = __pa(bytes); + if (PAGE_SIZE < (offset_in_page(bytes) + num_bytes)) + num_bytes = PAGE_SIZE - offset_in_page(bytes); + + if (IS_ENABLED(CONFIG_32BIT)) + ret = sbi_ecall(SBI_EXT_DBCN, SBI_EXT_DBCN_CONSOLE_WRITE, + num_bytes, lower_32_bits(base_addr), + upper_32_bits(base_addr), 0, 0, 0); + else + ret = sbi_ecall(SBI_EXT_DBCN, SBI_EXT_DBCN_CONSOLE_WRITE, + num_bytes, base_addr, 0, 0, 0, 0); + + if (ret.error == SBI_ERR_FAILURE) + return -EIO; + return ret.error ? sbi_err_map_linux_errno(ret.error) : ret.value; } -static const struct riscv_ipi_ops sbi_ipi_ops = { - .ipi_inject = sbi_send_cpumask_ipi -}; +int sbi_debug_console_read(char *bytes, unsigned int num_bytes) +{ + phys_addr_t base_addr; + struct sbiret ret; + + if (!sbi_debug_console_available) + return -EOPNOTSUPP; + + if (is_vmalloc_addr(bytes)) + base_addr = page_to_phys(vmalloc_to_page(bytes)) + + offset_in_page(bytes); + else + base_addr = __pa(bytes); + if (PAGE_SIZE < (offset_in_page(bytes) + num_bytes)) + num_bytes = PAGE_SIZE - offset_in_page(bytes); + + if (IS_ENABLED(CONFIG_32BIT)) + ret = sbi_ecall(SBI_EXT_DBCN, SBI_EXT_DBCN_CONSOLE_READ, + num_bytes, lower_32_bits(base_addr), + upper_32_bits(base_addr), 0, 0, 0); + else + ret = sbi_ecall(SBI_EXT_DBCN, SBI_EXT_DBCN_CONSOLE_READ, + num_bytes, base_addr, 0, 0, 0, 0); + + if (ret.error == SBI_ERR_FAILURE) + return -EIO; + return ret.error ? sbi_err_map_linux_errno(ret.error) : ret.value; +} void __init sbi_init(void) { + bool srst_power_off = false; int ret; - sbi_set_power_off(); ret = sbi_get_spec_version(); if (ret > 0) sbi_spec_version = ret; @@ -590,29 +661,49 @@ void __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) { + if (sbi_probe_extension(SBI_EXT_TIME)) { __sbi_set_timer = __sbi_set_timer_v02; pr_info("SBI TIME extension detected\n"); } else { __sbi_set_timer = __sbi_set_timer_v01; } - if (sbi_probe_extension(SBI_EXT_IPI) > 0) { + if (sbi_probe_extension(SBI_EXT_IPI)) { __sbi_send_ipi = __sbi_send_ipi_v02; pr_info("SBI IPI extension detected\n"); } else { __sbi_send_ipi = __sbi_send_ipi_v01; } - if (sbi_probe_extension(SBI_EXT_RFENCE) > 0) { + if (sbi_probe_extension(SBI_EXT_RFENCE)) { __sbi_rfence = __sbi_rfence_v02; pr_info("SBI RFENCE extension detected\n"); } else { __sbi_rfence = __sbi_rfence_v01; } + if (sbi_spec_version >= sbi_mk_version(0, 3) && + sbi_probe_extension(SBI_EXT_SRST)) { + pr_info("SBI SRST extension detected\n"); + register_platform_power_off(sbi_srst_power_off); + srst_power_off = true; + sbi_srst_reboot_nb.notifier_call = sbi_srst_reboot; + sbi_srst_reboot_nb.priority = 192; + register_restart_handler(&sbi_srst_reboot_nb); + } + if (sbi_spec_version >= sbi_mk_version(2, 0) && + sbi_probe_extension(SBI_EXT_DBCN) > 0) { + pr_info("SBI DBCN extension detected\n"); + sbi_debug_console_available = true; + } + if (sbi_spec_version >= sbi_mk_version(3, 0) && + sbi_probe_extension(SBI_EXT_FWFT)) { + pr_info("SBI FWFT extension detected\n"); + sbi_fwft_supported = true; + } } else { __sbi_set_timer = __sbi_set_timer_v01; __sbi_send_ipi = __sbi_send_ipi_v01; __sbi_rfence = __sbi_rfence_v01; } - riscv_set_ipi_ops(&sbi_ipi_ops); + if (!srst_power_off) + sbi_set_power_off(); } |