From mboxrd@z Thu Jan 1 00:00:00 1970 From: Clément Léger Date: Thu, 30 Nov 2023 10:13:17 +0100 Subject: [RFC PATCH 0/2] Add support for Supervisor Software Events extension Message-ID: <20231130091319.1223849-1-cleger@rivosinc.com> List-Id: To: opensbi@lists.infradead.org MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit The SBI Supervisor Software Events (SSE) extensions provides a mechanism to inject software events from an SBI implementation to supervisor software such that it preempts all other supervisor level traps and interrupts [1]. Various events are defined and can be send asynchronously to supervisor software (RAS, PMU, DEBUG, Asynchronous page fault) from SBI as well as platform specific events. Events can be either local (per-hart) or global. Events can be nested on top of each other based on priority and can interrupt the supervisor mode at any time. This PR adds support for this extension. First commit modifies interrupts handling to pass the sbi traps regs through interrupt handlers in order to inject SSE events from this context. Second one add the SSE support itself. A RFC for Linux which uses this extension is available at [2]. Link: https://lists.riscv.org/g/tech-prs/message/515 [1] Link: https://lore.kernel.org/linux-riscv/20231026143122.279437-1-cleger at rivosinc.com/ [2] Cl?ment L?ger (2): lib: sbi: provides regs to sbi_ipi_process() lib: sbi: add support for Supervisor Software Events extension include/sbi/sbi_ecall_interface.h | 36 +- include/sbi/sbi_error.h | 4 + include/sbi/sbi_ipi.h | 6 +- include/sbi/sbi_sse.h | 222 +++++++ lib/sbi/Kconfig | 4 + lib/sbi/objects.mk | 4 + lib/sbi/sbi_ecall.c | 7 +- lib/sbi/sbi_ecall_sse.c | 61 ++ lib/sbi/sbi_init.c | 13 + lib/sbi/sbi_ipi.c | 12 +- lib/sbi/sbi_sse.c | 963 ++++++++++++++++++++++++++++++ lib/sbi/sbi_tlb.c | 2 +- lib/sbi/sbi_trap.c | 4 +- lib/utils/irqchip/imsic.c | 2 +- 14 files changed, 1327 insertions(+), 13 deletions(-) create mode 100644 include/sbi/sbi_sse.h create mode 100644 lib/sbi/sbi_ecall_sse.c create mode 100644 lib/sbi/sbi_sse.c -- 2.42.0