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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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4
lib/sbi/sbi_init.c
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@@ -279,7 +279,7 @@ void __noreturn sbi_init(struct sbi_scratch *scratch)
const struct sbi_platform *plat = sbi_platform_ptr(scratch);
if ((SBI_HARTMASK_MAX_BITS <= hartid) ||
sbi_platform_hart_disabled(plat, hartid))
sbi_platform_hart_invalid(plat, hartid))
sbi_hart_hang();
if (atomic_add_return(&coldboot_lottery, 1) == 1)
@@ -322,7 +322,7 @@ void __noreturn sbi_exit(struct sbi_scratch *scratch)
u32 hartid = current_hartid();
const struct sbi_platform *plat = sbi_platform_ptr(scratch);
if (sbi_platform_hart_disabled(plat, hartid))
if (sbi_platform_hart_invalid(plat, hartid))
sbi_hart_hang();
sbi_platform_early_exit(plat);