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https://github.com/riscv-software-src/opensbi.git
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Evgeny Voevodin
e134d52106
Zkr architecture doesn't define a time limit on state transitions which results in hanging on unresponsive or event-driven platforms. To prevent this, we need to limit polling iterations and fall back in case the budget is over, and stack guard keeps its initial value. The budget is configurable with CONFIG_ZKR_POLL_BUDGET, defaulting to 1000 iterations. Successful reads do not consume a try. Signed-off-by: Evgeny Voevodin <evvoevod@tenstorrent.com> Reviewed-by: Anup Patel <anup@brainfault.org> Link: https://lore.kernel.org/r/20260519225014.244672-1-evvoevod@tenstorrent.com Signed-off-by: Anup Patel <anup@brainfault.org>
85 lines
1.7 KiB
Plaintext
85 lines
1.7 KiB
Plaintext
# SPDX-License-Identifier: BSD-2-Clause
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menu "Generic SBI Support"
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config CONSOLE_EARLY_BUFFER_SIZE
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int "Early console buffer size (bytes)"
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default 256
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config ZKR_POLL_BUDGET
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int "Zkr seed polling budget (iterations)"
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default 1000
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help
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Maximum number of iterations to poll CSR_SEED when initializing
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the stack guard variable. The Zkr specification doesn't define
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a time limit on transitioning to ES16 between polls, which
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makes it impossible to tell whether entropy is being
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accumulated slowly or the entropy source is not functioning.
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This also limits the wait time on systems with an event-driven
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entropy source. A successful read doesn't consume a try.
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config SBI_ECALL_TIME
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bool "Timer extension"
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default y
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config SBI_ECALL_RFENCE
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bool "RFENCE extension"
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default y
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config SBI_ECALL_IPI
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bool "IPI extension"
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default y
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config SBI_ECALL_HSM
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bool "Hart State Management extension"
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default y
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config SBI_ECALL_SRST
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bool "System Reset extension"
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default y
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config SBI_ECALL_SUSP
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bool "System Suspend extension"
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default y
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config SBI_ECALL_PMU
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bool "Performance Monitoring Unit extension"
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default y
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config SBI_ECALL_DBCN
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bool "Debug Console extension"
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default y
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config SBI_ECALL_CPPC
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bool "CPPC extension"
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default y
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config SBI_ECALL_FWFT
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bool "Firmware Feature extension"
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default y
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config SBI_ECALL_LEGACY
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bool "SBI v0.1 legacy extensions"
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default y
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config SBI_ECALL_VENDOR
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bool "Platform-defined vendor extensions"
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default y
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config SBI_ECALL_DBTR
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bool "Debug Trigger Extension"
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default y
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config SBIUNIT
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bool "Enable SBIUNIT tests"
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default n
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config SBI_ECALL_SSE
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bool "SSE extension"
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default y
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config SBI_ECALL_MPXY
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bool "MPXY extension"
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default y
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endmenu
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