linux-kernel - [PATCH v2 05/21] MIPS: Fix set_uncached

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Date:   Thu, 23 Nov 2023 16:26:22 +0100
From:   Gregory CLEMENT <gregory.clement@...tlin.com>
To:     Paul Burton <paulburton@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        linux-mips@...r.kernel.org, Jiaxun Yang <jiaxun.yang@...goat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Vladimir Kondratiev <vladimir.kondratiev@...ileye.com>,
        Tawfik Bayouk <tawfik.bayouk@...ileye.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Théo Lebrun <theo.lebrun@...tlin.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Vladimir Kondratiev <vladimir.kondratiev@...el.com>,
        Gregory CLEMENT <gregory.clement@...tlin.com>
Subject: [PATCH v2 05/21] MIPS: Fix set_uncached_handler for ebase in XKPHYS

From: Jiaxun Yang <jiaxun.yang@...goat.com>

ebase may be in XKPHYS if memblock unable to allocate memory
within KSEG0 physical range.

To map ebase into uncached space we just convert it back to
physical address and then use platform's TO_UNCAC helper
to create mapping.

Co-developed-by: Vladimir Kondratiev <vladimir.kondratiev@...el.com>
Signed-off-by: Vladimir Kondratiev <vladimir.kondratiev@...el.com>
Co-developed-by: Gregory CLEMENT <gregory.clement@...tlin.com>
Signed-off-by: Jiaxun Yang <jiaxun.yang@...goat.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@...tlin.com>
---
 arch/mips/kernel/traps.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index 60c513c51684f..230728d76d11f 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -2346,7 +2346,7 @@ static const char panic_null_cerr[] =
 void set_uncached_handler(unsigned long offset, void *addr,
 	unsigned long size)
 {
-	unsigned long uncached_ebase = CKSEG1ADDR(ebase);
+	unsigned long uncached_ebase = TO_UNCAC(__pa(ebase));
 
 	if (!addr)
 		panic(panic_null_cerr);
-- 
2.42.0