arm64/panic: Unify all three existing notifier blocks

Currently there are three different registered panic notifier blocks. This
unifies all of them into a single one i.e arm64_panic_block, hence reducing
code duplication and required calling sequence during panic. This preserves
the existing dump sequence. While here, just use device_initcall() directly
instead of __initcall() which has been a legacy alias for the earlier. This
replacement is a pure cleanup with no functional implications.

Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Steve Capper <steve.capper@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Link: https://lore.kernel.org/r/1593405511-7625-1-git-send-email-anshuman.khandual@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

arch/arm64/include/asm/cpufeature.h

@@ -774,6 +774,7 @@ static inline unsigned int get_vmid_bits(u64 mmfr1)
 }
 
 u32 get_kvm_ipa_limit(void);
+void dump_cpu_features(void);
 
 #endif /* __ASSEMBLY__ */
 

arch/arm64/include/asm/memory.h

@@ -322,6 +322,7 @@ static inline void *phys_to_virt(phys_addr_t x)
 	__is_lm_address(__addr) && pfn_valid(virt_to_pfn(__addr));	\
 })
 
+void dump_mem_limit(void);
 #endif /* !ASSEMBLY */
 
 /*

arch/arm64/kernel/cpufeature.c

@@ -119,25 +119,12 @@ static inline void finalize_system_capabilities(void)
 	static_branch_enable(&arm64_const_caps_ready);
 }
 
-static int dump_cpu_hwcaps(struct notifier_block *self, unsigned long v, void *p)
+void dump_cpu_features(void)
 {
 	/* file-wide pr_fmt adds "CPU features: " prefix */
 	pr_emerg("0x%*pb\n", ARM64_NCAPS, &cpu_hwcaps);
-	return 0;
 }
 
-static struct notifier_block cpu_hwcaps_notifier = {
-	.notifier_call = dump_cpu_hwcaps
-};
-
-static int __init register_cpu_hwcaps_dumper(void)
-{
-	atomic_notifier_chain_register(&panic_notifier_list,
-				       &cpu_hwcaps_notifier);
-	return 0;
-}
-__initcall(register_cpu_hwcaps_dumper);
-
 DEFINE_STATIC_KEY_ARRAY_FALSE(cpu_hwcap_keys, ARM64_NCAPS);
 EXPORT_SYMBOL(cpu_hwcap_keys);
 

arch/arm64/kernel/setup.c

@@ -400,11 +400,7 @@ static int __init topology_init(void)
 }
 subsys_initcall(topology_init);
 
-/*
- * Dump out kernel offset information on panic.
- */
-static int dump_kernel_offset(struct notifier_block *self, unsigned long v,
-			      void *p)
+static void dump_kernel_offset(void)
 {
 	const unsigned long offset = kaslr_offset();
 
@@ -415,17 +411,25 @@ static int dump_kernel_offset(struct notifier_block *self, unsigned long v,
 	} else {
 		pr_emerg("Kernel Offset: disabled\n");
 	}
+}
+
+static int arm64_panic_block_dump(struct notifier_block *self,
+				  unsigned long v, void *p)
+{
+	dump_kernel_offset();
+	dump_cpu_features();
+	dump_mem_limit();
 	return 0;
 }
 
-static struct notifier_block kernel_offset_notifier = {
-	.notifier_call = dump_kernel_offset
+static struct notifier_block arm64_panic_block = {
+	.notifier_call = arm64_panic_block_dump
 };
 
-static int __init register_kernel_offset_dumper(void)
+static int __init register_arm64_panic_block(void)
 {
 	atomic_notifier_chain_register(&panic_notifier_list,
-				       &kernel_offset_notifier);
+				       &arm64_panic_block);
 	return 0;
 }
-__initcall(register_kernel_offset_dumper);
+device_initcall(register_arm64_panic_block);

arch/arm64/mm/init.c

@@ -563,27 +563,11 @@ void free_initmem(void)
 	unmap_kernel_range((u64)__init_begin, (u64)(__init_end - __init_begin));
 }
 
-/*
- * Dump out memory limit information on panic.
- */
-static int dump_mem_limit(struct notifier_block *self, unsigned long v, void *p)
+void dump_mem_limit(void)
 {
 	if (memory_limit != PHYS_ADDR_MAX) {
 		pr_emerg("Memory Limit: %llu MB\n", memory_limit >> 20);
 	} else {
 		pr_emerg("Memory Limit: none\n");
 	}
-	return 0;
 }
-
-static struct notifier_block mem_limit_notifier = {
-	.notifier_call = dump_mem_limit,
-};
-
-static int __init register_mem_limit_dumper(void)
-{
-	atomic_notifier_chain_register(&panic_notifier_list,
-				       &mem_limit_notifier);
-	return 0;
-}
-__initcall(register_mem_limit_dumper);