linux-kernel - [PATCH v2 09/10] MIPS: traps: Enhance memblock ebase allocation process

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Date:   Fri, 27 Oct 2023 23:11:05 +0100
From:   Jiaxun Yang <jiaxun.yang@...goat.com>
To:     linux-mips@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, tsbogend@...ha.franken.de,
        gregory.clement@...tlin.com, vladimir.kondratiev@...el.com,
        Jiaxun Yang <jiaxun.yang@...goat.com>
Subject: [PATCH v2 09/10] MIPS: traps: Enhance memblock ebase allocation process

We try to allocate from KSEG0 accessible space first, and
then if we really can't allocate any memory from KSEG0 and
we are sure that we support ebase in higher segment, give
it another go without restriction.

This can maximize the possibility of having ebase in KSEG0.

Signed-off-by: Jiaxun Yang <jiaxun.yang@...goat.com>
---
 arch/mips/kernel/traps.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index b6e94654f621..68f1dd54cde1 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -2399,7 +2399,12 @@ void __init trap_init(void)
 		memblock_reserve(ebase_pa, vec_size);
 	} else {
 		vec_size = max(vec_size, PAGE_SIZE);
-		ebase_pa = memblock_phys_alloc(vec_size, 1 << fls(vec_size));
+		ebase_pa = memblock_phys_alloc_range(vec_size, 1 << fls(vec_size),
+						     0x0, KSEGX_SIZE - 1);
+
+		if (!ebase_pa && (IS_ENABLED(CONFIG_EVA) || cpu_has_ebase_wg))
+			ebase_pa = memblock_phys_alloc(vec_size, 1 << fls(vec_size));
+
 		if (!ebase_pa)
 			panic("%s: Failed to allocate %lu bytes align=0x%x\n",
 			      __func__, vec_size, 1 << fls(vec_size));
-- 
2.34.1