[PATCH v5 07/22] MIPS: Fix cache issue with mips_cps_core_entry

From: Gregory CLEMENT <gregory.clement@bootlin.com>
To: Paul Burton <paulburton@kernel.org>,
	Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
	linux-mips@vger.kernel.org, Jiaxun Yang <jiaxun.yang@flygoat.com>,
	Rob Herring <robh+dt@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: "Vladimir Kondratiev" <vladimir.kondratiev@mobileye.com>,
	"Tawfik Bayouk" <tawfik.bayouk@mobileye.com>,
	"Alexandre Belloni" <alexandre.belloni@bootlin.com>,
	"Théo Lebrun" <theo.lebrun@bootlin.com>,
	"Thomas Petazzoni" <thomas.petazzoni@bootlin.com>,
	"Gregory CLEMENT" <gregory.clement@bootlin.com>
Subject: [PATCH v5 07/22] MIPS: Fix cache issue with mips_cps_core_entry
Date: Tue, 12 Dec 2023 17:34:39 +0100	[thread overview]
Message-ID: <20231212163459.1923041-8-gregory.clement@bootlin.com> (raw)
In-Reply-To: <20231212163459.1923041-1-gregory.clement@bootlin.com>

Split setup_cps_vecs and move back the cache management latter in
cps_smp_setup when the cache subsystem had been initialized. Without
this the blast_inv_dcache_range() call can lead to a crash.

Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
---
 arch/mips/kernel/smp-cps.c | 32 ++++++++++++++++++--------------
 1 file changed, 18 insertions(+), 14 deletions(-)

diff --git a/arch/mips/kernel/smp-cps.c b/arch/mips/kernel/smp-cps.c
index 9aad678a32bd7..6cbdff917d147 100644
--- a/arch/mips/kernel/smp-cps.c
+++ b/arch/mips/kernel/smp-cps.c
@@ -53,6 +53,7 @@ UASM_L_LA(_not_nmi)
 
 static DECLARE_BITMAP(core_power, NR_CPUS);
 static uint32_t core_entry_reg;
+static phys_addr_t cps_vec_pa;
 
 struct core_boot_config *mips_cps_core_bootcfg;
 
@@ -112,17 +113,8 @@ static void __init *mips_cps_build_core_entry(void *addr)
 	return p;
 }
 
-static int __init setup_cps_vecs(void)
+static int __init allocate_cps_vecs(void)
 {
-	extern void excep_tlbfill(void);
-	extern void excep_xtlbfill(void);
-	extern void excep_cache(void);
-	extern void excep_genex(void);
-	extern void excep_intex(void);
-	extern void excep_ejtag(void);
-	phys_addr_t cps_vec_pa;
-	void *cps_vec;
-
 	/* Try to allocate in KSEG1 first */
 	cps_vec_pa = memblock_phys_alloc_range(BEV_VEC_SIZE, BEV_VEC_ALIGN,
 						0x0, KSEGX_SIZE - 1);
@@ -142,6 +134,19 @@ static int __init setup_cps_vecs(void)
 	if (!cps_vec_pa)
 		return -ENOMEM;
 
+	return 0;
+}
+
+static void __init setup_cps_vecs(void)
+{
+	extern void excep_tlbfill(void);
+	extern void excep_xtlbfill(void);
+	extern void excep_cache(void);
+	extern void excep_genex(void);
+	extern void excep_intex(void);
+	extern void excep_ejtag(void);
+	void *cps_vec;
+
 	/* We want to ensure cache is clean before writing uncached mem */
 	blast_dcache_range(TO_CAC(cps_vec_pa), TO_CAC(cps_vec_pa) + BEV_VEC_SIZE);
 	bc_wback_inv(TO_CAC(cps_vec_pa), BEV_VEC_SIZE);
@@ -161,8 +166,6 @@ static int __init setup_cps_vecs(void)
 	blast_inv_dcache_range(TO_CAC(cps_vec_pa), TO_CAC(cps_vec_pa) + BEV_VEC_SIZE);
 	bc_inv(TO_CAC(cps_vec_pa), BEV_VEC_SIZE);
 	__sync();
-
-	return 0;
 }
 
 static void __init cps_smp_setup(void)
@@ -224,8 +227,8 @@ static void __init cps_smp_setup(void)
 	/* Make core 0 coherent with everything */
 	write_gcr_cl_coherence(0xff);
 
-	if (setup_cps_vecs())
-		pr_err("Failed to setup CPS vectors\n");
+	if (allocate_cps_vecs())
+		pr_err("Failed to allocate CPS vectors\n");
 
 	if (core_entry_reg && mips_cm_revision() >= CM_REV_CM3)
 		write_gcr_bev_base(core_entry_reg);
@@ -280,6 +283,7 @@ static void __init cps_prepare_cpus(unsigned int max_cpus)
 			(cca_unsuitable && cpu_has_dc_aliases) ? " & " : "",
 			cpu_has_dc_aliases ? "dcache aliasing" : "");
 
+	setup_cps_vecs();
 
 	/* Allocate core boot configuration structs */
 	ncores = mips_cps_numcores(0);
-- 
2.42.0

