[kvm-unit-tests,v7,5/6] lib: riscv: Add SBI SSE support

Message ID	20250214114423.1071621-6-cleger@rivosinc.com (mailing list archive)
State	New
Headers	show Received: from mail-pj1-f45.google.com (mail-pj1-f45.google.com [209.85.216.45]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0987021CA1F for <kvm@vger.kernel.org>; Fri, 14 Feb 2025 11:45:14 +0000 (UTC) From: =?utf-8?b?Q2zDqW1lbnQgTMOpZ2Vy?= <cleger@rivosinc.com> To: kvm@vger.kernel.org, kvm-riscv@lists.infradead.org Cc: =?utf-8?b?Q2zDqW1lbnQgTMOpZ2Vy?= <cleger@rivosinc.com>, Andrew Jones <ajones@ventanamicro.com>, Anup Patel <apatel@ventanamicro.com>, Atish Patra <atishp@rivosinc.com> Subject: [kvm-unit-tests PATCH v7 5/6] lib: riscv: Add SBI SSE support Date: Fri, 14 Feb 2025 12:44:18 +0100 Message-ID: <20250214114423.1071621-6-cleger@rivosinc.com> In-Reply-To: <20250214114423.1071621-1-cleger@rivosinc.com> References: <20250214114423.1071621-1-cleger@rivosinc.com> Precedence: bulk MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit
Series	riscv: add SBI SSE extension tests \| expand [kvm-unit-tests,v7,0/6] riscv: add SBI SSE extension tests [kvm-unit-tests,v7,1/6] kbuild: Allow multiple asm-offsets file to be generated [kvm-unit-tests,v7,2/6] riscv: Set .aux.o files as .PRECIOUS [kvm-unit-tests,v7,3/6] riscv: Use asm-offsets to generate SBI_EXT_HSM values [kvm-unit-tests,v7,4/6] riscv: lib: Add SBI SSE extension definitions [kvm-unit-tests,v7,5/6] lib: riscv: Add SBI SSE support [kvm-unit-tests,v7,6/6] riscv: sbi: Add SSE extension tests

diff --git a/riscv/Makefile b/riscv/Makefile index 02d2ac39..ed590ede 100644 --- a/riscv/Makefile +++ b/riscv/Makefile @@ -43,6 +43,8 @@ cflatobjs += lib/riscv/setup.o cflatobjs += lib/riscv/smp.o cflatobjs += lib/riscv/stack.o cflatobjs += lib/riscv/timer.o +cflatobjs += lib/riscv/sbi-sse-asm.o +cflatobjs += lib/riscv/sbi-sse.o ifeq ($(ARCH),riscv32) cflatobjs += lib/ldiv32.o endif diff --git a/lib/riscv/asm/csr.h b/lib/riscv/asm/csr.h index 16f5ddd7..389d9850 100644 --- a/lib/riscv/asm/csr.h +++ b/lib/riscv/asm/csr.h @@ -17,6 +17,7 @@ #define CSR_TIME 0xc01 #define SR_SIE _AC(0x00000002, UL) +#define SR_SPP _AC(0x00000100, UL) /* Exception cause high bit - is an interrupt if set */ #define CAUSE_IRQ_FLAG (_AC(1, UL) << (__riscv_xlen - 1)) diff --git a/lib/riscv/asm/sbi-sse.h b/lib/riscv/asm/sbi-sse.h new file mode 100644 index 00000000..ba18ce27 --- /dev/null +++ b/lib/riscv/asm/sbi-sse.h @@ -0,0 +1,48 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * SBI SSE library interface + * + * Copyright (C) 2025, Rivos Inc., Clément Léger <cleger@rivosinc.com> + */ +#ifndef _RISCV_SSE_H_ +#define _RISCV_SSE_H_ + +#include <asm/sbi.h> + +typedef void (*sbi_sse_handler_fn)(void *data, struct pt_regs *regs, unsigned int hartid); + +struct sbi_sse_handler_arg { + unsigned long reg_tmp; + sbi_sse_handler_fn handler; + void *handler_data; + void *stack; +}; + +extern void sbi_sse_entry(void); + +static inline bool sbi_sse_event_is_global(uint32_t event_id) +{ + return !!(event_id & SBI_SSE_EVENT_GLOBAL_BIT); +} + +struct sbiret sbi_sse_read_attrs_raw(unsigned long event_id, unsigned long base_attr_id, + unsigned long attr_count, unsigned long phys_lo, + unsigned long phys_hi); +struct sbiret sbi_sse_read_attrs(unsigned long event_id, unsigned long base_attr_id, + unsigned long attr_count, unsigned long *values); +struct sbiret sbi_sse_write_attrs_raw(unsigned long event_id, unsigned long base_attr_id, + unsigned long attr_count, unsigned long phys_lo, + unsigned long phys_hi); +struct sbiret sbi_sse_write_attrs(unsigned long event_id, unsigned long base_attr_id, + unsigned long attr_count, unsigned long *values); +struct sbiret sbi_sse_register_raw(unsigned long event_id, unsigned long entry_pc, + unsigned long entry_arg); +struct sbiret sbi_sse_register(unsigned long event_id, struct sbi_sse_handler_arg *arg); +struct sbiret sbi_sse_unregister(unsigned long event_id); +struct sbiret sbi_sse_enable(unsigned long event_id); +struct sbiret sbi_sse_hart_mask(void); +struct sbiret sbi_sse_hart_unmask(void); +struct sbiret sbi_sse_inject(unsigned long event_id, unsigned long hart_id); +struct sbiret sbi_sse_disable(unsigned long event_id); + +#endif /* !_RISCV_SSE_H_ */ diff --git a/lib/riscv/sbi-sse-asm.S b/lib/riscv/sbi-sse-asm.S new file mode 100644 index 00000000..5f60b839 --- /dev/null +++ b/lib/riscv/sbi-sse-asm.S @@ -0,0 +1,103 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * RISC-V SSE events entry point. + * + * Copyright (C) 2025, Rivos Inc., Clément Léger <cleger@rivosinc.com> + */ +#define __ASSEMBLY__ +#include <asm/asm.h> +#include <asm/csr.h> +#include <asm/asm-offsets.h> +#include <generated/sbi-asm-offsets.h> + +.section .text +.global sbi_sse_entry +sbi_sse_entry: + /* Save stack temporarily */ + REG_S sp, SBI_SSE_REG_TMP(a7) + /* Set entry stack */ + REG_L sp, SBI_SSE_HANDLER_STACK(a7) + + addi sp, sp, -(PT_SIZE) + REG_S ra, PT_RA(sp) + REG_S s0, PT_S0(sp) + REG_S s1, PT_S1(sp) + REG_S s2, PT_S2(sp) + REG_S s3, PT_S3(sp) + REG_S s4, PT_S4(sp) + REG_S s5, PT_S5(sp) + REG_S s6, PT_S6(sp) + REG_S s7, PT_S7(sp) + REG_S s8, PT_S8(sp) + REG_S s9, PT_S9(sp) + REG_S s10, PT_S10(sp) + REG_S s11, PT_S11(sp) + REG_S tp, PT_TP(sp) + REG_S t0, PT_T0(sp) + REG_S t1, PT_T1(sp) + REG_S t2, PT_T2(sp) + REG_S t3, PT_T3(sp) + REG_S t4, PT_T4(sp) + REG_S t5, PT_T5(sp) + REG_S t6, PT_T6(sp) + REG_S gp, PT_GP(sp) + REG_S a0, PT_A0(sp) + REG_S a1, PT_A1(sp) + REG_S a2, PT_A2(sp) + REG_S a3, PT_A3(sp) + REG_S a4, PT_A4(sp) + REG_S a5, PT_A5(sp) + csrr a1, CSR_SEPC + REG_S a1, PT_EPC(sp) + csrr a2, CSR_SSTATUS + REG_S a2, PT_STATUS(sp) + + REG_L a0, SBI_SSE_REG_TMP(a7) + REG_S a0, PT_SP(sp) + + REG_L t0, SBI_SSE_HANDLER(a7) + REG_L a0, SBI_SSE_HANDLER_DATA(a7) + mv a1, sp + mv a2, a6 + jalr t0 + + REG_L a1, PT_EPC(sp) + REG_L a2, PT_STATUS(sp) + csrw CSR_SEPC, a1 + csrw CSR_SSTATUS, a2 + + REG_L ra, PT_RA(sp) + REG_L s0, PT_S0(sp) + REG_L s1, PT_S1(sp) + REG_L s2, PT_S2(sp) + REG_L s3, PT_S3(sp) + REG_L s4, PT_S4(sp) + REG_L s5, PT_S5(sp) + REG_L s6, PT_S6(sp) + REG_L s7, PT_S7(sp) + REG_L s8, PT_S8(sp) + REG_L s9, PT_S9(sp) + REG_L s10, PT_S10(sp) + REG_L s11, PT_S11(sp) + REG_L tp, PT_TP(sp) + REG_L t0, PT_T0(sp) + REG_L t1, PT_T1(sp) + REG_L t2, PT_T2(sp) + REG_L t3, PT_T3(sp) + REG_L t4, PT_T4(sp) + REG_L t5, PT_T5(sp) + REG_L t6, PT_T6(sp) + REG_L gp, PT_GP(sp) + REG_L a0, PT_A0(sp) + REG_L a1, PT_A1(sp) + REG_L a2, PT_A2(sp) + REG_L a3, PT_A3(sp) + REG_L a4, PT_A4(sp) + REG_L a5, PT_A5(sp) + + REG_L sp, PT_SP(sp) + + li a7, ASM_SBI_EXT_SSE + li a6, ASM_SBI_EXT_SSE_COMPLETE + ecall + diff --git a/lib/riscv/asm-offsets.c b/lib/riscv/asm-offsets.c index 6c511c14..77e5d26d 100644 --- a/lib/riscv/asm-offsets.c +++ b/lib/riscv/asm-offsets.c @@ -4,6 +4,7 @@ #include <asm/processor.h> #include <asm/ptrace.h> #include <asm/smp.h> +#include <asm/sbi-sse.h> int main(void) { @@ -63,5 +64,13 @@ int main(void) OFFSET(THREAD_INFO_HARTID, thread_info, hartid); DEFINE(THREAD_INFO_SIZE, sizeof(struct thread_info)); + DEFINE(ASM_SBI_EXT_SSE, SBI_EXT_SSE); + DEFINE(ASM_SBI_EXT_SSE_COMPLETE, SBI_EXT_SSE_COMPLETE); + + OFFSET(SBI_SSE_REG_TMP, sbi_sse_handler_arg, reg_tmp); + OFFSET(SBI_SSE_HANDLER, sbi_sse_handler_arg, handler); + OFFSET(SBI_SSE_HANDLER_DATA, sbi_sse_handler_arg, handler_data); + OFFSET(SBI_SSE_HANDLER_STACK, sbi_sse_handler_arg, stack); + return 0; } diff --git a/lib/riscv/sbi-sse.c b/lib/riscv/sbi-sse.c new file mode 100644 index 00000000..bc4dd10e --- /dev/null +++ b/lib/riscv/sbi-sse.c @@ -0,0 +1,84 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * SBI SSE library + * + * Copyright (C) 2025, Rivos Inc., Clément Léger <cleger@rivosinc.com> + */ +#include <asm/sbi.h> +#include <asm/sbi-sse.h> +#include <asm/io.h> + +struct sbiret sbi_sse_read_attrs_raw(unsigned long event_id, unsigned long base_attr_id, + unsigned long attr_count, unsigned long phys_lo, + unsigned long phys_hi) +{ + return sbi_ecall(SBI_EXT_SSE, SBI_EXT_SSE_READ_ATTRS, event_id, base_attr_id, attr_count, + phys_lo, phys_hi, 0); +} + +struct sbiret sbi_sse_read_attrs(unsigned long event_id, unsigned long base_attr_id, + unsigned long attr_count, unsigned long *values) +{ + phys_addr_t p = virt_to_phys(values); + + return sbi_sse_read_attrs_raw(event_id, base_attr_id, attr_count, lower_32_bits(p), + upper_32_bits(p)); +} + +struct sbiret sbi_sse_write_attrs_raw(unsigned long event_id, unsigned long base_attr_id, + unsigned long attr_count, unsigned long phys_lo, + unsigned long phys_hi) +{ + return sbi_ecall(SBI_EXT_SSE, SBI_EXT_SSE_WRITE_ATTRS, event_id, base_attr_id, attr_count, + phys_lo, phys_hi, 0); +} + +struct sbiret sbi_sse_write_attrs(unsigned long event_id, unsigned long base_attr_id, + unsigned long attr_count, unsigned long *values) +{ + phys_addr_t p = virt_to_phys(values); + + return sbi_sse_write_attrs_raw(event_id, base_attr_id, attr_count, lower_32_bits(p), + upper_32_bits(p)); +} + +struct sbiret sbi_sse_register_raw(unsigned long event_id, unsigned long entry_pc, + unsigned long entry_arg) +{ + return sbi_ecall(SBI_EXT_SSE, SBI_EXT_SSE_REGISTER, event_id, entry_pc, entry_arg, 0, 0, 0); +} + +struct sbiret sbi_sse_register(unsigned long event_id, struct sbi_sse_handler_arg *arg) +{ + return sbi_sse_register_raw(event_id, virt_to_phys(sbi_sse_entry), virt_to_phys(arg)); +} + +struct sbiret sbi_sse_unregister(unsigned long event_id) +{ + return sbi_ecall(SBI_EXT_SSE, SBI_EXT_SSE_UNREGISTER, event_id, 0, 0, 0, 0, 0); +} + +struct sbiret sbi_sse_enable(unsigned long event_id) +{ + return sbi_ecall(SBI_EXT_SSE, SBI_EXT_SSE_ENABLE, event_id, 0, 0, 0, 0, 0); +} + +struct sbiret sbi_sse_disable(unsigned long event_id) +{ + return sbi_ecall(SBI_EXT_SSE, SBI_EXT_SSE_DISABLE, event_id, 0, 0, 0, 0, 0); +} + +struct sbiret sbi_sse_hart_mask(void) +{ + return sbi_ecall(SBI_EXT_SSE, SBI_EXT_SSE_HART_MASK, 0, 0, 0, 0, 0, 0); +} + +struct sbiret sbi_sse_hart_unmask(void) +{ + return sbi_ecall(SBI_EXT_SSE, SBI_EXT_SSE_HART_UNMASK, 0, 0, 0, 0, 0, 0); +} + +struct sbiret sbi_sse_inject(unsigned long event_id, unsigned long hart_id) +{ + return sbi_ecall(SBI_EXT_SSE, SBI_EXT_SSE_INJECT, event_id, hart_id, 0, 0, 0, 0); +}

[kvm-unit-tests,v7,5/6] lib: riscv: Add SBI SSE support

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