linux-kernel - [PATCH v2 07/10] MIPS: traps: Handle CPU with non standard vint offset

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Message-Id: <20231027221106.405666-8-jiaxun.yang@flygoat.com>
Date:   Fri, 27 Oct 2023 23:11:03 +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 07/10] MIPS: traps: Handle CPU with non standard vint offset

Some BMIPS cpus has none standard start offset for vector interrupts.

Handle those CPUs in vector size calculation and handler setup process.

Signed-off-by: Jiaxun Yang <jiaxun.yang@...goat.com>
---
 arch/mips/kernel/traps.c | 32 +++++++++++++++++++++++---------
 1 file changed, 23 insertions(+), 9 deletions(-)

diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index ea59d321f713..651c9ec6265a 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -74,7 +74,6 @@
 
 #include "access-helper.h"
 
-#define MAX(a, b) ((a) >= (b) ? (a) : (b))
 
 extern void check_wait(void);
 extern asmlinkage void rollback_handle_int(void);
@@ -2005,6 +2004,7 @@ void __noreturn nmi_exception_handler(struct pt_regs *regs)
 unsigned long ebase;
 EXPORT_SYMBOL_GPL(ebase);
 unsigned long exception_handlers[32];
+static unsigned long vi_vecbase;
 unsigned long vi_handlers[64];
 
 void reserve_exception_space(phys_addr_t addr, unsigned long size)
@@ -2074,7 +2074,7 @@ static void *set_vi_srs_handler(int n, vi_handler_t addr, int srs)
 		handler = (unsigned long) addr;
 	vi_handlers[n] = handler;
 
-	b = (unsigned char *)(ebase + 0x200 + n*VECTORSPACING);
+	b = (unsigned char *)(vi_vecbase + n*VECTORSPACING);
 
 	if (srs >= srssets)
 		panic("Shadow register set %d not supported", srs);
@@ -2370,20 +2370,33 @@ void __init trap_init(void)
 	extern char except_vec3_generic;
 	extern char except_vec4;
 	extern char except_vec3_r4000;
-	unsigned long i, vec_size;
+	unsigned long i, vec_size, vi_vec_offset;
 	phys_addr_t ebase_pa;
 
 	check_wait();
 
+	if (cpu_has_veic || cpu_has_vint) {
+		switch (current_cpu_type()) {
+		case CPU_BMIPS3300:
+		case CPU_BMIPS4380:
+			vi_vec_offset = 0x400;
+			break;
+		case CPU_BMIPS5000:
+			vi_vec_offset = 0x1000;
+			break;
+		default:
+			vi_vec_offset = 0x200;
+			break;
+		}
+		vec_size = vi_vec_offset + VECTORSPACING*64;
+	} else {
+		vec_size = 0x400;
+	}
+
 	if (!cpu_has_mips_r2_r6) {
 		ebase = CAC_BASE;
-		vec_size = 0x400;
 	} else {
-		if (cpu_has_veic || cpu_has_vint)
-			vec_size = 0x200 + VECTORSPACING*64;
-		else
-			vec_size = PAGE_SIZE;
-
+		vec_size = max(vec_size, PAGE_SIZE);
 		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",
@@ -2450,6 +2463,7 @@ void __init trap_init(void)
 	 * Initialise interrupt handlers
 	 */
 	if (cpu_has_veic || cpu_has_vint) {
+		vi_vecbase = ebase + vi_vec_offset;
 		int nvec = cpu_has_veic ? 64 : 8;
 		for (i = 0; i < nvec; i++)
 			set_vi_handler(i, NULL);
-- 
2.34.1