linux-kernel - [RFC PATCH v8 08/21] riscv: Add vector struct and assembler definitions

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Date:   Thu,  9 Sep 2021 01:45:20 +0800
From:   Greentime Hu <greentime.hu@...ive.com>
To:     linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        aou@...s.berkeley.edu, palmer@...belt.com,
        paul.walmsley@...ive.com, vincent.chen@...ive.com
Subject: [RFC PATCH v8 08/21] riscv: Add vector struct and assembler definitions

Add vector state context struct in struct thread and asm-offsets.c
definitions.

The vector registers will be saved in datap pointer of __riscv_v_state. It
will be dynamically allocated in kernel space. It will be put right after
the __riscv_v_state data structure in user space.

Co-developed-by: Vincent Chen <vincent.chen@...ive.com>
Signed-off-by: Vincent Chen <vincent.chen@...ive.com>
Signed-off-by: Greentime Hu <greentime.hu@...ive.com>
---
 arch/riscv/include/asm/processor.h   |  1 +
 arch/riscv/include/uapi/asm/ptrace.h | 11 +++++++++++
 arch/riscv/kernel/asm-offsets.c      |  6 ++++++
 3 files changed, 18 insertions(+)

diff --git a/arch/riscv/include/asm/processor.h b/arch/riscv/include/asm/processor.h
index 021ed64ee608..1b037c69d311 100644
--- a/arch/riscv/include/asm/processor.h
+++ b/arch/riscv/include/asm/processor.h
@@ -35,6 +35,7 @@ struct thread_struct {
 	unsigned long s[12];	/* s[0]: frame pointer */
 	struct __riscv_d_ext_state fstate;
 	unsigned long bad_cause;
+	struct __riscv_v_state vstate;
 };
 
 #define INIT_THREAD {					\
diff --git a/arch/riscv/include/uapi/asm/ptrace.h b/arch/riscv/include/uapi/asm/ptrace.h
index 882547f6bd5c..bd3b8a710246 100644
--- a/arch/riscv/include/uapi/asm/ptrace.h
+++ b/arch/riscv/include/uapi/asm/ptrace.h
@@ -77,6 +77,17 @@ union __riscv_fp_state {
 	struct __riscv_q_ext_state q;
 };
 
+struct __riscv_v_state {
+	unsigned long vstart;
+	unsigned long vl;
+	unsigned long vtype;
+	unsigned long vcsr;
+	void *datap;
+#if __riscv_xlen == 32
+	__u32 __padding;
+#endif
+};
+
 #endif /* __ASSEMBLY__ */
 
 #endif /* _UAPI_ASM_RISCV_PTRACE_H */
diff --git a/arch/riscv/kernel/asm-offsets.c b/arch/riscv/kernel/asm-offsets.c
index 90f8ce64fa6f..34f43c84723a 100644
--- a/arch/riscv/kernel/asm-offsets.c
+++ b/arch/riscv/kernel/asm-offsets.c
@@ -72,6 +72,12 @@ void asm_offsets(void)
 	OFFSET(TSK_STACK_CANARY, task_struct, stack_canary);
 #endif
 
+	OFFSET(RISCV_V_STATE_VSTART, __riscv_v_state, vstart);
+	OFFSET(RISCV_V_STATE_VL, __riscv_v_state, vl);
+	OFFSET(RISCV_V_STATE_VTYPE, __riscv_v_state, vtype);
+	OFFSET(RISCV_V_STATE_VCSR, __riscv_v_state, vcsr);
+	OFFSET(RISCV_V_STATE_DATAP, __riscv_v_state, datap);
+
 	DEFINE(PT_SIZE, sizeof(struct pt_regs));
 	OFFSET(PT_EPC, pt_regs, epc);
 	OFFSET(PT_RA, pt_regs, ra);
-- 
2.31.1