mirror of
https://github.com/torvalds/linux.git
synced 2025-11-04 02:30:34 +02:00
41cad8284d
sbi_probe_extension() is specified with "Returns 0 if the given SBI
extension ID (EID) is not available, or 1 if it is available unless
defined as any other non-zero value by the implementation."
Additionally, sbiret.value is a long. Fix the implementation to
ensure any nonzero long value is considered a success, rather
than only positive int values.
Fixes: b9dcd9e415 ("RISC-V: Add basic support for SBI v0.2")
Signed-off-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20230427163626.101042-1-ajones@ventanamicro.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
632 lines
17 KiB
C
632 lines
17 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* SBI initialilization and all extension implementation.
|
|
*
|
|
* Copyright (c) 2020 Western Digital Corporation or its affiliates.
|
|
*/
|
|
|
|
#include <linux/bits.h>
|
|
#include <linux/init.h>
|
|
#include <linux/pm.h>
|
|
#include <linux/reboot.h>
|
|
#include <asm/sbi.h>
|
|
#include <asm/smp.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 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;
|
|
|
|
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
|
|
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);
|
|
}
|
|
|
|
return hmask;
|
|
}
|
|
|
|
/**
|
|
* 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_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 void __sbi_send_ipi_v01(unsigned int cpu)
|
|
{
|
|
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);
|
|
}
|
|
|
|
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);
|
|
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 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());
|
|
}
|
|
|
|
static int __sbi_rfence_v01(int fid, const struct cpumask *cpu_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 void __sbi_send_ipi_v02(unsigned int cpu)
|
|
{
|
|
int result;
|
|
struct sbiret ret = {0};
|
|
|
|
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);
|
|
}
|
|
}
|
|
|
|
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)
|
|
{
|
|
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, hbase, 0, 0, 0, 0);
|
|
break;
|
|
case SBI_EXT_RFENCE_REMOTE_SFENCE_VMA:
|
|
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, hbase, start,
|
|
size, arg4, 0);
|
|
break;
|
|
|
|
case SBI_EXT_RFENCE_REMOTE_HFENCE_GVMA:
|
|
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, hbase, start,
|
|
size, arg4, 0);
|
|
break;
|
|
case SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA:
|
|
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, 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, result);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
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 hartid, cpuid, hmask = 0, hbase = 0, htop = 0;
|
|
int result;
|
|
|
|
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) {
|
|
hbase = hartid;
|
|
htop = hartid;
|
|
} else if (hartid > htop) {
|
|
htop = hartid;
|
|
}
|
|
hmask |= BIT(hartid - hbase);
|
|
}
|
|
|
|
if (hmask) {
|
|
result = __sbi_rfence_v02_call(fid, hmask, 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.
|
|
* @cpu: Logical id of the target CPU.
|
|
*/
|
|
void sbi_send_ipi(unsigned int cpu)
|
|
{
|
|
__sbi_send_ipi(cpu);
|
|
}
|
|
EXPORT_SYMBOL(sbi_send_ipi);
|
|
|
|
/**
|
|
* sbi_remote_fence_i() - Execute FENCE.I instruction on given remote 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 struct cpumask *cpu_mask)
|
|
{
|
|
return __sbi_rfence(SBI_EXT_RFENCE_REMOTE_FENCE_I,
|
|
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.
|
|
* @cpu_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 struct cpumask *cpu_mask,
|
|
unsigned long start,
|
|
unsigned long size)
|
|
{
|
|
return __sbi_rfence(SBI_EXT_RFENCE_REMOTE_SFENCE_VMA,
|
|
cpu_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.
|
|
*
|
|
* @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).
|
|
*
|
|
* Return: 0 on success, appropriate linux error code otherwise.
|
|
*/
|
|
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,
|
|
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.
|
|
* @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 struct cpumask *cpu_mask,
|
|
unsigned long start,
|
|
unsigned long size)
|
|
{
|
|
return __sbi_rfence(SBI_EXT_RFENCE_REMOTE_HFENCE_GVMA,
|
|
cpu_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.
|
|
*
|
|
* @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 struct cpumask *cpu_mask,
|
|
unsigned long start,
|
|
unsigned long size,
|
|
unsigned long vmid)
|
|
{
|
|
return __sbi_rfence(SBI_EXT_RFENCE_REMOTE_HFENCE_GVMA_VMID,
|
|
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.
|
|
* @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 struct cpumask *cpu_mask,
|
|
unsigned long start,
|
|
unsigned long size)
|
|
{
|
|
return __sbi_rfence(SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA,
|
|
cpu_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.
|
|
*
|
|
* @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 struct cpumask *cpu_mask,
|
|
unsigned long start,
|
|
unsigned long size,
|
|
unsigned long asid)
|
|
{
|
|
return __sbi_rfence(SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA_ASID,
|
|
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: 1 or an extension specific nonzero value if yes, 0 otherwise.
|
|
*/
|
|
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)
|
|
return ret.value;
|
|
|
|
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);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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);
|
|
|
|
void __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)) {
|
|
__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)) {
|
|
__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)) {
|
|
__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");
|
|
pm_power_off = sbi_srst_power_off;
|
|
sbi_srst_reboot_nb.notifier_call = sbi_srst_reboot;
|
|
sbi_srst_reboot_nb.priority = 192;
|
|
register_restart_handler(&sbi_srst_reboot_nb);
|
|
}
|
|
} else {
|
|
__sbi_set_timer = __sbi_set_timer_v01;
|
|
__sbi_send_ipi = __sbi_send_ipi_v01;
|
|
__sbi_rfence = __sbi_rfence_v01;
|
|
}
|
|
}
|