opensbi.git/lib/sbi/sbi_init.c, branch v1.5

lib: sbi: add support for firmware features extension

2024-06-19T12:39:22Z

This extension allows the software running in supervisor mode to control the behavior of various features of the SBI [1]. Implement the support for such extension. Link: https://lists.riscv.org/g/tech-prs/message/924 [1] Signed-off-by: Clément Léger Reviewed-by: Anup Patel

lib: sbi: Wakeup non-coldboot HARTs early in the coldboot path

2024-04-05T12:18:25Z

Currently, all non-coldboot HARTs busy spin in wait_for_coldboot() until the entire coldboot init sequence is completed. This means: 1) On QEMU, all non-coldboot HARTs will eat host CPU time and also slow down the coldboot HART until the entire coldboot init sequence is completed. 2) On real HW, all non-coldboot HARTs will consume more CPU power until the entire coldboot init sequence is completed. To address this, wake up all non-coldboot HARTs as early as possible in the coldboot init sequence. Signed-off-by: Anup Patel

lib: sbi: Simplify wait_for_coldboot() implementation

2024-04-05T12:18:23Z

On QEMU virt machine with large number of HARTs, some of the HARTs randomly fail to come out of wait_for_coldboot() due to one of the following race-conditions: 1) Failing HARTs are not able to acquire the coldboot_lock and update the coldboot_hartmask in wait_for_coldboot() before the coldboot HART acquires the coldboot_lock and sends IPI in wake_coldboot_harts() hence the failing HARTs never receive IPI from the coldboot HART. 2) Failing HARTs acquire the coldbood_lock and update the coldboot_hartmask before coldboot HART does sbi_scratch_init() so the sbi_hartmask_set_hartid() does not update the coldboot_hartmask on the failing HARTs hence they never receive IPI from the coldboot HART. To address this, use a simple busy-loop in wait_for_coldboot() for polling on coldboot_done flag. Signed-off-by: Anup Patel

lib: sbi: Add support for Supervisor Software Events extension

2024-04-05T10:17:30Z

This extension [1] allows to deliver events from SBI to supervisor via a software mechanism. This extension defines events (either local or global) which are signaled by the SBI on specific signal sources (IRQ, exceptions, etc) and are injected to be executed in supervisor mode. [1] https://lists.riscv.org/g/tech-prs/message/798 Signed-off-by: Clément Léger Reviewed-by: Himanshu Chauhan Reviewed-by: Anup Patel

lib: Add SBIUnit testing macros and functions

2024-03-10T04:35:28Z

This patch introduces all of the SBIUnit macros and functions which can be used during the test development process. Also, it defines the 'run_all_tests' function, which is being called during the 'init_coldboot' right after printing the boot hart information. Also, add the CONFIG_SBIUNIT Kconfig entry in order to be able to turn the tests on and off. When the CONFIG_SBIUNIT is disabled, the tests and all related code is excluded completely on the compilation stage. Signed-off-by: Ivan Orlov Reviewed-by: Andrew Jones

lib: sbi: Print number of debug triggers found

2024-01-10T05:25:52Z

Print the total number of triggers found on the boot hart. Signed-off-by: Himanshu Chauhan Reviewed-by: Anup Patel

lib: sbi: Introduce the SBI debug triggers extension support

2024-01-10T05:25:42Z

RISC-V Debug specification includes Sdtrig ISA extension which describes Trigger Module. Triggers can cause a breakpoint exception or trace action without execution of a special instruction. They can be used to implement hardware breakpoints and watchpoints for native debugging. The SBI Debut Trigger extension (Draft v6) can be found at: https://lists.riscv.org/g/tech-debug/topic/99825362#1302 This patch is an initial implementation of SBI Debug Trigger Extension (Draft v6) in OpenSBI. The following features are supported: * mcontrol, mcontrol6 triggers * Breakpoint and trace actions NOTE: Chained triggers are not supported Signed-off-by: Himanshu Chauhan Reviewed-by: Anup Patel

lib: sbi: skip wait_for_coldboot when coolboot done

2023-12-11T04:06:57Z

When warmboot via HSM, coolboot has been completed and wait_for_coldboot can be skipped to speed up. Signed-off-by: Xiang W Reviewed-by: Anup Patel

lib: sbi_hart: Store PMP granularity as log base 2

2023-12-08T17:13:12Z

This minimizes the need to call log2roundup() to recover the log value. Signed-off-by: Samuel Holland Reviewed-by: Anup Patel

lib: sbi: Remove sbi_scratch_last_hartid() macro

2023-09-24T06:11:54Z

The sbi_scratch_last_hartid() macro is not of much use on platforms with really sparse hartids so let us replace use of this macro with other approaches. Signed-off-by: Anup Patel