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-rw-r--r--arch/riscv/include/asm/sbi.h139
-rw-r--r--arch/riscv/kernel/sbi.c243
-rw-r--r--arch/riscv/kernel/setup.c5
3 files changed, 314 insertions, 73 deletions
diff --git a/arch/riscv/include/asm/sbi.h b/arch/riscv/include/asm/sbi.h
index 2a637ebd7a22..5b7b91c7e7e6 100644
--- a/arch/riscv/include/asm/sbi.h
+++ b/arch/riscv/include/asm/sbi.h
@@ -10,92 +10,88 @@
#include <linux/types.h>
#ifdef CONFIG_RISCV_SBI
-#define SBI_EXT_0_1_SET_TIMER 0x0
-#define SBI_EXT_0_1_CONSOLE_PUTCHAR 0x1
-#define SBI_EXT_0_1_CONSOLE_GETCHAR 0x2
-#define SBI_EXT_0_1_CLEAR_IPI 0x3
-#define SBI_EXT_0_1_SEND_IPI 0x4
-#define SBI_EXT_0_1_REMOTE_FENCE_I 0x5
-#define SBI_EXT_0_1_REMOTE_SFENCE_VMA 0x6
-#define SBI_EXT_0_1_REMOTE_SFENCE_VMA_ASID 0x7
-#define SBI_EXT_0_1_SHUTDOWN 0x8
+enum sbi_ext_id {
+ SBI_EXT_0_1_SET_TIMER = 0x0,
+ SBI_EXT_0_1_CONSOLE_PUTCHAR = 0x1,
+ SBI_EXT_0_1_CONSOLE_GETCHAR = 0x2,
+ SBI_EXT_0_1_CLEAR_IPI = 0x3,
+ SBI_EXT_0_1_SEND_IPI = 0x4,
+ SBI_EXT_0_1_REMOTE_FENCE_I = 0x5,
+ SBI_EXT_0_1_REMOTE_SFENCE_VMA = 0x6,
+ SBI_EXT_0_1_REMOTE_SFENCE_VMA_ASID = 0x7,
+ SBI_EXT_0_1_SHUTDOWN = 0x8,
+ SBI_EXT_BASE = 0x10,
+};
-#define SBI_CALL(which, arg0, arg1, arg2, arg3) ({ \
- 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 a7 asm ("a7") = (uintptr_t)(which); \
- asm volatile ("ecall" \
- : "+r" (a0) \
- : "r" (a1), "r" (a2), "r" (a3), "r" (a7) \
- : "memory"); \
- a0; \
-})
+enum sbi_ext_base_fid {
+ SBI_EXT_BASE_GET_SPEC_VERSION = 0,
+ SBI_EXT_BASE_GET_IMP_ID,
+ SBI_EXT_BASE_GET_IMP_VERSION,
+ SBI_EXT_BASE_PROBE_EXT,
+ SBI_EXT_BASE_GET_MVENDORID,
+ SBI_EXT_BASE_GET_MARCHID,
+ SBI_EXT_BASE_GET_MIMPID,
+};
-/* Lazy implementations until SBI is finalized */
-#define SBI_CALL_0(which) SBI_CALL(which, 0, 0, 0, 0)
-#define SBI_CALL_1(which, arg0) SBI_CALL(which, arg0, 0, 0, 0)
-#define SBI_CALL_2(which, arg0, arg1) SBI_CALL(which, arg0, arg1, 0, 0)
-#define SBI_CALL_3(which, arg0, arg1, arg2) \
- SBI_CALL(which, arg0, arg1, arg2, 0)
-#define SBI_CALL_4(which, arg0, arg1, arg2, arg3) \
- SBI_CALL(which, arg0, arg1, arg2, arg3)
+#define SBI_SPEC_VERSION_DEFAULT 0x1
+#define SBI_SPEC_VERSION_MAJOR_SHIFT 24
+#define SBI_SPEC_VERSION_MAJOR_MASK 0x7f
+#define SBI_SPEC_VERSION_MINOR_MASK 0xffffff
-static inline void sbi_console_putchar(int ch)
-{
- SBI_CALL_1(SBI_EXT_0_1_CONSOLE_PUTCHAR, ch);
-}
+/* SBI return error codes */
+#define SBI_SUCCESS 0
+#define SBI_ERR_FAILURE -1
+#define SBI_ERR_NOT_SUPPORTED -2
+#define SBI_ERR_INVALID_PARAM -3
+#define SBI_ERR_DENIED -4
+#define SBI_ERR_INVALID_ADDRESS -5
-static inline int sbi_console_getchar(void)
-{
- return SBI_CALL_0(SBI_EXT_0_1_CONSOLE_GETCHAR);
-}
+extern unsigned long sbi_spec_version;
+struct sbiret {
+ long error;
+ long value;
+};
-static inline void sbi_set_timer(uint64_t stime_value)
-{
-#if __riscv_xlen == 32
- SBI_CALL_2(SBI_EXT_0_1_SET_TIMER, stime_value,
- stime_value >> 32);
-#else
- SBI_CALL_1(SBI_EXT_0_1_SET_TIMER, stime_value);
-#endif
-}
-
-static inline void sbi_shutdown(void)
-{
- SBI_CALL_0(SBI_EXT_0_1_SHUTDOWN);
-}
+int sbi_init(void);
+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);
-static inline void sbi_clear_ipi(void)
-{
- SBI_CALL_0(SBI_EXT_0_1_CLEAR_IPI);
-}
+void sbi_console_putchar(int ch);
+int sbi_console_getchar(void);
+void sbi_set_timer(uint64_t stime_value);
+void sbi_shutdown(void);
+void sbi_clear_ipi(void);
+void sbi_send_ipi(const unsigned long *hart_mask);
+void sbi_remote_fence_i(const unsigned long *hart_mask);
+void sbi_remote_sfence_vma(const unsigned long *hart_mask,
+ unsigned long start,
+ unsigned long size);
-static inline void sbi_send_ipi(const unsigned long *hart_mask)
-{
- SBI_CALL_1(SBI_EXT_0_1_SEND_IPI, hart_mask);
-}
+void sbi_remote_sfence_vma_asid(const unsigned long *hart_mask,
+ unsigned long start,
+ unsigned long size,
+ unsigned long asid);
+int sbi_probe_extension(int ext);
-static inline void sbi_remote_fence_i(const unsigned long *hart_mask)
+/* Check if current SBI specification version is 0.1 or not */
+static inline int sbi_spec_is_0_1(void)
{
- SBI_CALL_1(SBI_EXT_0_1_REMOTE_FENCE_I, hart_mask);
+ return (sbi_spec_version == SBI_SPEC_VERSION_DEFAULT) ? 1 : 0;
}
-static inline void sbi_remote_sfence_vma(const unsigned long *hart_mask,
- unsigned long start,
- unsigned long size)
+/* Get the major version of SBI */
+static inline unsigned long sbi_major_version(void)
{
- SBI_CALL_3(SBI_EXT_0_1_REMOTE_SFENCE_VMA, hart_mask, start, size);
+ return (sbi_spec_version >> SBI_SPEC_VERSION_MAJOR_SHIFT) &
+ SBI_SPEC_VERSION_MAJOR_MASK;
}
-static inline void sbi_remote_sfence_vma_asid(const unsigned long *hart_mask,
- unsigned long start,
- unsigned long size,
- unsigned long asid)
+/* Get the minor version of SBI */
+static inline unsigned long sbi_minor_version(void)
{
- SBI_CALL_4(SBI_EXT_0_1_REMOTE_SFENCE_VMA_ASID, hart_mask,
- start, size, asid);
+ return sbi_spec_version & SBI_SPEC_VERSION_MINOR_MASK;
}
#else /* CONFIG_RISCV_SBI */
/* stubs for code that is only reachable under IS_ENABLED(CONFIG_RISCV_SBI): */
@@ -103,5 +99,6 @@ void sbi_set_timer(uint64_t stime_value);
void sbi_clear_ipi(void);
void sbi_send_ipi(const unsigned long *hart_mask);
void sbi_remote_fence_i(const unsigned long *hart_mask);
+void sbi_init(void);
#endif /* CONFIG_RISCV_SBI */
#endif /* _ASM_RISCV_SBI_H */
diff --git a/arch/riscv/kernel/sbi.c b/arch/riscv/kernel/sbi.c
index f6c7c3e82d28..4aee0b49df3c 100644
--- a/arch/riscv/kernel/sbi.c
+++ b/arch/riscv/kernel/sbi.c
@@ -1,17 +1,256 @@
// 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>
+/* default SBI version is 0.1 */
+unsigned long sbi_spec_version = SBI_SPEC_VERSION_DEFAULT;
+EXPORT_SYMBOL(sbi_spec_version);
+
+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);
+
+static 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;
+ };
+}
+
+/**
+ * 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_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)
+{
+#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
+}
+EXPORT_SYMBOL(sbi_set_timer);
+
+/**
+ * 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);
+}
+
+/**
+ * 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_ecall(SBI_EXT_0_1_SEND_IPI, 0, (unsigned long)hart_mask,
+ 0, 0, 0, 0, 0);
+}
+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_ecall(SBI_EXT_0_1_REMOTE_FENCE_I, 0, (unsigned long)hart_mask,
+ 0, 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_ecall(SBI_EXT_0_1_REMOTE_SFENCE_VMA, 0,
+ (unsigned long)hart_mask, start, size, 0, 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_ecall(SBI_EXT_0_1_REMOTE_SFENCE_VMA_ASID, 0,
+ (unsigned long)hart_mask, start, size, asid, 0, 0);
+}
+EXPORT_SYMBOL(sbi_remote_sfence_vma_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);
+}
+
static void sbi_power_off(void)
{
sbi_shutdown();
}
-static int __init sbi_init(void)
+int __init sbi_init(void)
{
+ int ret;
+
pm_power_off = sbi_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());
return 0;
}
-early_initcall(sbi_init);
diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
index cb836fcc6118..07f4e7503223 100644
--- a/arch/riscv/kernel/setup.c
+++ b/arch/riscv/kernel/setup.c
@@ -22,6 +22,7 @@
#include <asm/sections.h>
#include <asm/pgtable.h>
#include <asm/smp.h>
+#include <asm/sbi.h>
#include <asm/tlbflush.h>
#include <asm/thread_info.h>
#include <asm/kasan.h>
@@ -83,6 +84,10 @@ void __init setup_arch(char **cmdline_p)
kasan_init();
#endif
+#if IS_ENABLED(CONFIG_RISCV_SBI)
+ sbi_init();
+#endif
+
#ifdef CONFIG_SMP
setup_smp();
#endif