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lib: sbi_domain: Reduce memory usage of per-domain hart context

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In current implementation, the length of hartindex_to_context_table[]
array is fixed as SBI_HARTMASK_MAX_BITS. However, the number of harts
supported by the platform might not be SBI_HARTMASK_MAX_BITS and is
usually smaller than SBI_HARTMASK_MAX_BITS. This means it is unnecessary
to allocate such fixed-length array here.

Precisely, current implementation always allocates 1024 bytes for
hartindex_to_context_table[128] on RV64 platform. However, a platform
supports two harts only needs hartindex_to_context_table[2], which only
needs 16 bytes.

This commit calculates needed size of hartindex_to_context_table[]
according to supported number of harts on the platform when registering
per-domain data, so that memory usage of per-domain context data can be
reduced.

Signed-off-by: Alvin Chang <alvinga@andestech.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20250326062051.3763530-1-alvinga@andestech.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Alvin Chang
2025-03-26 14:20:51 +08:00
committed by Anup Patel
parent 2b09a98701
commit 4d0128ec58
1 changed files with 21 additions and 14 deletions
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35
lib/sbi/sbi_domain_context.c
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@@ -53,31 +53,30 @@ struct hart_context {
bool initialized; bool initialized;
}; };
struct domain_context_priv { static struct sbi_domain_data dcpriv;
/** Contexts for possible HARTs indexed by hartindex */
struct hart_context *hartindex_to_context_table[SBI_HARTMASK_MAX_BITS];
};
static struct sbi_domain_data dcpriv = {
.data_size = sizeof(struct domain_context_priv),
};
static inline struct hart_context *hart_context_get(struct sbi_domain *dom, static inline struct hart_context *hart_context_get(struct sbi_domain *dom,
u32 hartindex) u32 hartindex)
{ {
struct domain_context_priv *dcp = sbi_domain_data_ptr(dom, &dcpriv); struct hart_context **dom_hartindex_to_context_table;
return (dcp && hartindex < SBI_HARTMASK_MAX_BITS) ? dom_hartindex_to_context_table = sbi_domain_data_ptr(dom, &dcpriv);
dcp->hartindex_to_context_table[hartindex] : NULL; if (!dom_hartindex_to_context_table || !sbi_hartindex_valid(hartindex))
return NULL;
return dom_hartindex_to_context_table[hartindex];
} }
static void hart_context_set(struct sbi_domain *dom, u32 hartindex, static void hart_context_set(struct sbi_domain *dom, u32 hartindex,
struct hart_context *hc) struct hart_context *hc)
{ {
struct domain_context_priv *dcp = sbi_domain_data_ptr(dom, &dcpriv); struct hart_context **dom_hartindex_to_context_table;
if (dcp && hartindex < SBI_HARTMASK_MAX_BITS) dom_hartindex_to_context_table = sbi_domain_data_ptr(dom, &dcpriv);
dcp->hartindex_to_context_table[hartindex] = hc; if (!dom_hartindex_to_context_table || !sbi_hartindex_valid(hartindex))
return;
dom_hartindex_to_context_table[hartindex] = hc;
} }
/** Macro to obtain the current hart's context pointer */ /** Macro to obtain the current hart's context pointer */
@@ -232,6 +231,14 @@ int sbi_domain_context_exit(void)
int sbi_domain_context_init(void) int sbi_domain_context_init(void)
{ {
/**
* Allocate per-domain and per-hart context data.
* The data type is "struct hart_context **" whose memory space will be
* dynamically allocated by domain_setup_data_one(). Calculate needed
* size of memory space here.
*/
dcpriv.data_size = sizeof(struct hart_context *) * sbi_hart_count();
return sbi_domain_register_data(&dcpriv); return sbi_domain_register_data(&dcpriv);
} }