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lib: sbi: Set the scratch allocation to alignment to cacheline size

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Set the scratch allocation alignment to cacheline size specified by
riscv,cbom-block-size in the DTS file to avoid two atomic variables
from the same cache line causing livelock on some platforms. If the
cacheline is not specified, we set it a default value.

Signed-off-by: Raj Vishwanathan <Raj.Vishwanathan@gmail.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Reviewed-by: Samuel Holland <samuel.holland@sifive.com>
Link: https://lore.kernel.org/r/20250423225045.267983-1-Raj.Vishwanathan@gmail.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Raj Vishwanathan
2025-04-23 15:50:45 -07:00
committed by Anup Patel
parent 4d0128ec58
commit 99aabc6b84
5 changed files with 63 additions and 2 deletions
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5
include/sbi/sbi_platform.h
View File

@@ -39,6 +39,8 @@
#define SBI_PLATFORM_FIRMWARE_CONTEXT_OFFSET (0x60 + __SIZEOF_POINTER__)
/** Offset of hart_index2id in struct sbi_platform */
#define SBI_PLATFORM_HART_INDEX2ID_OFFSET (0x60 + (__SIZEOF_POINTER__ * 2))
/** Offset of cbom_block_size in struct sbi_platform */
#define SBI_PLATFORM_CBOM_BLOCK_SIZE_OFFSET (0x60 + (__SIZEOF_POINTER__ * 3))
#define SBI_PLATFORM_TLB_RANGE_FLUSH_LIMIT_DEFAULT (1UL << 12)
@@ -190,6 +192,8 @@ struct sbi_platform {
* hart_index2id[<abc>] = <abc>
*/
const u32 *hart_index2id;
/** Allocation alignment for Scratch */
unsigned long cbom_block_size;
};
/**
@@ -207,6 +211,7 @@ assert_member_offset(struct sbi_platform, reserved, SBI_PLATFORM_RESERVED_OFFSET
assert_member_offset(struct sbi_platform, platform_ops_addr, SBI_PLATFORM_OPS_OFFSET);
assert_member_offset(struct sbi_platform, firmware_context, SBI_PLATFORM_FIRMWARE_CONTEXT_OFFSET);
assert_member_offset(struct sbi_platform, hart_index2id, SBI_PLATFORM_HART_INDEX2ID_OFFSET);
assert_member_offset(struct sbi_platform, cbom_block_size, SBI_PLATFORM_CBOM_BLOCK_SIZE_OFFSET);
/** Get pointer to sbi_platform for sbi_scratch pointer */
#define sbi_platform_ptr(__s) \

2
include/sbi_utils/fdt/fdt_helper.h
View File

@@ -50,6 +50,8 @@ int fdt_parse_hart_id(const void *fdt, int cpu_offset, u32 *hartid);
int fdt_parse_max_enabled_hart_id(const void *fdt, u32 *max_hartid);
int fdt_parse_cbom_block_size(const void *fdt, int cpu_offset, unsigned long *cbom_block_size);
int fdt_parse_timebase_frequency(const void *fdt, unsigned long *freq);
int fdt_parse_isa_extensions(const void *fdt, unsigned int hartid,