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lib: sbi: dbtr: Fix shared memory layout

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The existing sbi_dbtr_shmem_entry has a size of 5 * XLEN with the final
entry being idx. This is in contrast to the SBI v3.0-rc7 Chapter 19.
Debug Triggers Extension [0] where idx and trig_state share the same
offset (0) in shared memory, with a total size of 4 * XLEN for all the
SBI calls.

Replace struct with union to match memory layout described in SBI.

[0] https://github.com/riscv-non-isa/riscv-sbi-doc/tree/v3.0-rc7/src/ext-debug-triggers.adoc

Fixes: 97f234f15c96 ("lib: sbi: Introduce the SBI debug triggers extension support")
Signed-off-by: Jesse Taube <jesse@rivosinc.com>
Reviewed-by: Charlie Jenkins <charlie@rivosinc.com>
Tested-by: Charlie Jenkins <charlie@rivosinc.com>
Reviewed-by: Himanshu Chauhan <hchauhan@ventanamicro.com>
Tested-by: Himanshu Chauhan <hchauhan@ventanamicro.com>
Link: https://lore.kernel.org/r/20250604135225.842241-1-jesse@rivosinc.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Jesse Taube 2025-06-04 06:52:25 -07:00 committed by Anup Patel
parent 9f64f06193
commit 033e0e2353
2 changed files with 4 additions and 4 deletions
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2
include/sbi/sbi_dbtr.h
View File

@ -90,7 +90,7 @@ struct sbi_dbtr_hart_triggers_state {
}while (0);
/** SBI shared mem messages layout */
struct sbi_dbtr_shmem_entry {
union sbi_dbtr_shmem_entry {
struct sbi_dbtr_data_msg data;
struct sbi_dbtr_id_msg id;
};

6
lib/sbi/sbi_dbtr.c
View File

@ -506,7 +506,7 @@ int sbi_dbtr_read_trig(unsigned long smode,
{
struct sbi_dbtr_data_msg *xmit;
struct sbi_dbtr_trigger *trig;
struct sbi_dbtr_shmem_entry *entry;
union sbi_dbtr_shmem_entry *entry;
void *shmem_base = NULL;
struct sbi_dbtr_hart_triggers_state *hs = NULL;
@ -541,7 +541,7 @@ int sbi_dbtr_install_trig(unsigned long smode,
unsigned long trig_count, unsigned long *out)
{
void *shmem_base = NULL;
struct sbi_dbtr_shmem_entry *entry;
union sbi_dbtr_shmem_entry *entry;
struct sbi_dbtr_data_msg *recv;
struct sbi_dbtr_id_msg *xmit;
unsigned long ctrl;
@ -659,7 +659,7 @@ int sbi_dbtr_update_trig(unsigned long smode,
struct sbi_dbtr_data_msg *recv;
unsigned long uidx = 0;
struct sbi_dbtr_trigger *trig;
struct sbi_dbtr_shmem_entry *entry;
union sbi_dbtr_shmem_entry *entry;
void *shmem_base = NULL;
struct sbi_dbtr_hart_triggers_state *hs = NULL;