linux-kernel - [PATCH v3 1/4] riscv: add SBI SSE extension definitions

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Message-ID: <20241206163102.843505-2-cleger@rivosinc.com>
Date: Fri,  6 Dec 2024 17:30:57 +0100
From: Clément Léger <cleger@...osinc.com>
To: Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Cc: Clément Léger <cleger@...osinc.com>,
	Himanshu Chauhan <hchauhan@...tanamicro.com>,
	Anup Patel <apatel@...tanamicro.com>,
	Xu Lu <luxu.kernel@...edance.com>,
	Atish Patra <atishp@...shpatra.org>
Subject: [PATCH v3 1/4] riscv: add SBI SSE extension definitions

Add needed definitions for SBI Supervisor Software Events extension [1].
This extension enables the SBI to inject events into supervisor software
much like ARM SDEI.

[1] https://lists.riscv.org/g/tech-prs/message/515

Signed-off-by: Clément Léger <cleger@...osinc.com>
---
 arch/riscv/include/asm/sbi.h | 62 ++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)

diff --git a/arch/riscv/include/asm/sbi.h b/arch/riscv/include/asm/sbi.h
index 6c82318065cf..032dde350d40 100644
--- a/arch/riscv/include/asm/sbi.h
+++ b/arch/riscv/include/asm/sbi.h
@@ -35,6 +35,7 @@ enum sbi_ext_id {
 	SBI_EXT_DBCN = 0x4442434E,
 	SBI_EXT_STA = 0x535441,
 	SBI_EXT_NACL = 0x4E41434C,
+	SBI_EXT_SSE = 0x535345,
 
 	/* Experimentals extensions must lie within this range */
 	SBI_EXT_EXPERIMENTAL_START = 0x08000000,
@@ -401,6 +402,63 @@ enum sbi_ext_nacl_feature {
 #define SBI_NACL_SHMEM_SRET_X(__i)		((__riscv_xlen / 8) * (__i))
 #define SBI_NACL_SHMEM_SRET_X_LAST		31
 
+enum sbi_ext_sse_fid {
+	SBI_SSE_EVENT_ATTR_READ = 0,
+	SBI_SSE_EVENT_ATTR_WRITE,
+	SBI_SSE_EVENT_REGISTER,
+	SBI_SSE_EVENT_UNREGISTER,
+	SBI_SSE_EVENT_ENABLE,
+	SBI_SSE_EVENT_DISABLE,
+	SBI_SSE_EVENT_COMPLETE,
+	SBI_SSE_EVENT_SIGNAL,
+	SBI_SSE_EVENT_HART_UNMASK,
+	SBI_SSE_EVENT_HART_MASK,
+};
+
+enum sbi_sse_state {
+	SBI_SSE_STATE_UNUSED     = 0,
+	SBI_SSE_STATE_REGISTERED = 1,
+	SBI_SSE_STATE_ENABLED    = 2,
+	SBI_SSE_STATE_RUNNING    = 3,
+};
+
+/* SBI SSE Event Attributes. */
+enum sbi_sse_attr_id {
+	SBI_SSE_ATTR_STATUS		= 0x00000000,
+	SBI_SSE_ATTR_PRIO		= 0x00000001,
+	SBI_SSE_ATTR_CONFIG		= 0x00000002,
+	SBI_SSE_ATTR_PREFERRED_HART	= 0x00000003,
+	SBI_SSE_ATTR_ENTRY_PC		= 0x00000004,
+	SBI_SSE_ATTR_ENTRY_ARG		= 0x00000005,
+	SBI_SSE_ATTR_INTERRUPTED_SEPC	= 0x00000006,
+	SBI_SSE_ATTR_INTERRUPTED_FLAGS	= 0x00000007,
+	SBI_SSE_ATTR_INTERRUPTED_A6	= 0x00000008,
+	SBI_SSE_ATTR_INTERRUPTED_A7	= 0x00000009,
+
+	SBI_SSE_ATTR_MAX		= 0x0000000A
+};
+
+#define SBI_SSE_ATTR_STATUS_STATE_OFFSET	0
+#define SBI_SSE_ATTR_STATUS_STATE_MASK		0x3
+#define SBI_SSE_ATTR_STATUS_PENDING_OFFSET	2
+#define SBI_SSE_ATTR_STATUS_INJECT_OFFSET	3
+
+#define SBI_SSE_ATTR_CONFIG_ONESHOT	(1 << 0)
+
+#define SBI_SSE_ATTR_INTERRUPTED_FLAGS_SSTATUS_SPP	(1 << 0)
+#define SBI_SSE_ATTR_INTERRUPTED_FLAGS_SSTATUS_SPIE	(1 << 1)
+#define SBI_SSE_ATTR_INTERRUPTED_FLAGS_HSTATUS_SPV	(1 << 2)
+#define SBI_SSE_ATTR_INTERRUPTED_FLAGS_HSTATUS_SPVP	(1 << 3)
+
+#define SBI_SSE_EVENT_LOCAL_RAS		0x00000000
+#define SBI_SSE_EVENT_GLOBAL_RAS	0x00008000
+#define SBI_SSE_EVENT_LOCAL_PMU		0x00010000
+#define SBI_SSE_EVENT_LOCAL_SOFTWARE	0xffff0000
+#define SBI_SSE_EVENT_GLOBAL_SOFTWARE	0xffff8000
+
+#define SBI_SSE_EVENT_PLATFORM		(1 << 14)
+#define SBI_SSE_EVENT_GLOBAL		(1 << 15)
+
 /* SBI spec version fields */
 #define SBI_SPEC_VERSION_DEFAULT	0x1
 #define SBI_SPEC_VERSION_MAJOR_SHIFT	24
@@ -418,6 +476,8 @@ enum sbi_ext_nacl_feature {
 #define SBI_ERR_ALREADY_STARTED -7
 #define SBI_ERR_ALREADY_STOPPED -8
 #define SBI_ERR_NO_SHMEM	-9
+#define SBI_ERR_INVALID_STATE	-10
+#define SBI_ERR_BAD_RANGE	-11
 
 extern unsigned long sbi_spec_version;
 struct sbiret {
@@ -504,6 +564,8 @@ static inline int sbi_err_map_linux_errno(int err)
 	case SBI_ERR_DENIED:
 		return -EPERM;
 	case SBI_ERR_INVALID_PARAM:
+	case SBI_ERR_BAD_RANGE:
+	case SBI_ERR_INVALID_STATE:
 		return -EINVAL;
 	case SBI_ERR_INVALID_ADDRESS:
 		return -EFAULT;
-- 
2.45.2