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include: sbi_platform: Introduce HART index to HART id table

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A platform can have discontinuous and/or sparse HART ids so we
cannot always assume a set of HARTs with continuous HART ids.

This patch adds support for discontinuous and sparse HART ids by
introducing HART index to HART id table. This table has platform
hart_count entries and it maps HART index to HART id.

The HART index to HART id table has only two restrictions:
1. HART index < sbi_platform hart_count
2. HART id < SBI_HARTMASK_MAX_BITS

Example1:
Let's say we have a platform with 2 HART ids 11 and 22, for such a
a platform:
hart_count = 2
hart_index2id[0] = 11
hart_index2id[1] = 22

Example2:
Let's say we have a platform with 5 HARTs ids 0, 1, 2, 3, and 4
but out of these HART with id 0 is not usable so for such a platform:
hart_count = 5
hart_index2id[0] = -1U
hart_index2id[1] = 1
hart_index2id[2] = 2
hart_index2id[3] = 3
hart_index2id[4] = 4
OR
hart_count = 4
hart_index2id[0] = 1
hart_index2id[1] = 2
hart_index2id[2] = 3
hart_index2id[3] = 4

With HART index to HART id table in place, the hart_disabled()
callback is now redundant so we remove it as well.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
This commit is contained in:
Anup Patel
2020-03-15 11:39:25 +05:30
committed by Anup Patel
parent 75eec9dd3f
commit c51f02cf14
6 changed files with 89 additions and 28 deletions
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7
lib/sbi/sbi_scratch.c
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@@ -19,7 +19,7 @@ struct sbi_scratch *hartid_to_scratch_table[SBI_HARTMASK_MAX_BITS] = { 0 };
static spinlock_t extra_lock = SPIN_LOCK_INITIALIZER;
static unsigned long extra_offset = SBI_SCRATCH_EXTRA_SPACE_OFFSET;
typedef struct sbi_scratch *(*hartid2scratch)(ulong hartid);
typedef struct sbi_scratch *(*hartid2scratch)(ulong hartid, ulong hartindex);
int sbi_scratch_init(struct sbi_scratch *scratch)
{
@@ -27,10 +27,11 @@ int sbi_scratch_init(struct sbi_scratch *scratch)
const struct sbi_platform *plat = sbi_platform_ptr(scratch);
for (i = 0; i < SBI_HARTMASK_MAX_BITS; i++) {
if (sbi_platform_hart_disabled(plat, i))
if (sbi_platform_hart_invalid(plat, i))
continue;
hartid_to_scratch_table[i] =
((hartid2scratch)scratch->hartid_to_scratch)(i);
((hartid2scratch)scratch->hartid_to_scratch)(i,
sbi_platform_hart_index(plat, i));
}
return 0;