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platform: Allow platforms to specify the size of tlb fifo

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For some platforms with a particularly high number of harts, if the
tlb fifo is too small, it case harts to wait. Platforms should be
allowed to specify the size of the tlb fifo.

Signed-off-by: Xiang W <wxjstz@126.com>
Signed-off-by: Xing Xiaoguang <xiaoguang.xing@sophgo.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Xiang W 2023-09-06 21:10:03 +08:00 • committed by Anup Patel
parent 901d3d7bff
commit cacfba32cc
5 changed files with 29 additions and 4 deletions
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18
include/sbi/sbi_platform.h
View file

@ -41,6 +41,7 @@
#define SBI_PLATFORM_HART_INDEX2ID_OFFSET (0x60 + (__SIZEOF_POINTER__ * 2))
#define SBI_PLATFORM_TLB_RANGE_FLUSH_LIMIT_DEFAULT (1UL << 12)
#define SBI_PLATFORM_TLB_FIFO_NUM_ENTRIES 8
#ifndef __ASSEMBLER__
@ -125,6 +126,9 @@ struct sbi_platform_operations {
/** Get tlb flush limit value **/
u64 (*get_tlbr_flush_limit)(void);
/** Get tlb fifo num entries*/
u32 (*get_tlb_num_entries)(void);
/** Initialize platform timer for current HART */
int (*timer_init)(bool cold_boot);
/** Exit platform timer for current HART */
@ -325,6 +329,20 @@ static inline u64 sbi_platform_tlbr_flush_limit(const struct sbi_platform *plat)
return SBI_PLATFORM_TLB_RANGE_FLUSH_LIMIT_DEFAULT;
}
/**
* Get platform specific tlb fifo num entries.
*
* @param plat pointer to struct sbi_platform
*
* @return number of tlb fifo entries
*/
static inline u32 sbi_platform_tlb_fifo_num_entries(const struct sbi_platform *plat)
{
if (plat && sbi_platform_ops(plat)->get_tlb_num_entries)
return sbi_platform_ops(plat)->get_tlb_num_entries();
return SBI_PLATFORM_TLB_FIFO_NUM_ENTRIES;
}
/**
* Get total number of HARTs supported by the platform
*

2
include/sbi/sbi_tlb.h
View file

@ -20,8 +20,6 @@
/* clang-format on */
#define SBI_TLB_FIFO_NUM_ENTRIES 8
struct sbi_scratch;
struct sbi_tlb_info {

4
lib/sbi/sbi_tlb.c
View file

@ -422,7 +422,7 @@ int sbi_tlb_init(struct sbi_scratch *scratch, bool cold_boot)
return SBI_ENOMEM;
}
tlb_fifo_mem_off = sbi_scratch_alloc_offset(
SBI_TLB_FIFO_NUM_ENTRIES * SBI_TLB_INFO_SIZE);
sbi_platform_tlb_fifo_num_entries(plat) * SBI_TLB_INFO_SIZE);
if (!tlb_fifo_mem_off) {
sbi_scratch_free_offset(tlb_fifo_off);
sbi_scratch_free_offset(tlb_sync_off);
@ -453,7 +453,7 @@ int sbi_tlb_init(struct sbi_scratch *scratch, bool cold_boot)
ATOMIC_INIT(tlb_sync, 0);
sbi_fifo_init(tlb_q, tlb_mem,
SBI_TLB_FIFO_NUM_ENTRIES, SBI_TLB_INFO_SIZE);
sbi_platform_tlb_fifo_num_entries(plat), SBI_TLB_INFO_SIZE);
return 0;
}

1
platform/generic/include/platform_override.h
View file

@ -18,6 +18,7 @@ struct platform_override {
const struct fdt_match *match_table;
u64 (*features)(const struct fdt_match *match);
u64 (*tlbr_flush_limit)(const struct fdt_match *match);
u32 (*tlb_num_entries)(const struct fdt_match *match);
bool (*cold_boot_allowed)(u32 hartid, const struct fdt_match *match);
int (*early_init)(bool cold_boot, const struct fdt_match *match);
int (*final_init)(bool cold_boot, const struct fdt_match *match);

8
platform/generic/platform.c
View file

@ -256,6 +256,13 @@ static u64 generic_tlbr_flush_limit(void)
return SBI_PLATFORM_TLB_RANGE_FLUSH_LIMIT_DEFAULT;
}
static u32 generic_tlb_num_entries(void)
{
if (generic_plat && generic_plat->tlb_num_entries)
return generic_plat->tlb_num_entries(generic_plat_match);
return SBI_PLATFORM_TLB_FIFO_NUM_ENTRIES;
}
static int generic_pmu_init(void)
{
return fdt_pmu_setup(fdt_get_address());
@ -308,6 +315,7 @@ const struct sbi_platform_operations platform_ops = {
.pmu_init = generic_pmu_init,
.pmu_xlate_to_mhpmevent = generic_pmu_xlate_to_mhpmevent,
.get_tlbr_flush_limit = generic_tlbr_flush_limit,
.get_tlb_num_entries = generic_tlb_num_entries,
.timer_init = fdt_timer_init,
.timer_exit = fdt_timer_exit,
.vendor_ext_check = generic_vendor_ext_check,