linux-kernel - [PATCH v4 03/10] crash hp: definitions and prototype changes

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Message-Id: <20220209195706.51522-4-eric.devolder@oracle.com>
Date:   Wed,  9 Feb 2022 14:56:59 -0500
From:   Eric DeVolder <eric.devolder@...cle.com>
To:     linux-kernel@...r.kernel.org, x86@...nel.org,
        kexec@...ts.infradead.org, ebiederm@...ssion.com,
        dyoung@...hat.com, bhe@...hat.com, vgoyal@...hat.com
Cc:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, hpa@...or.com,
        nramas@...ux.microsoft.com, thomas.lendacky@....com,
        robh@...nel.org, efault@....de, rppt@...nel.org,
        konrad.wilk@...cle.com, boris.ostrovsky@...cle.com,
        eric.devolder@...cle.com
Subject: [PATCH v4 03/10] crash hp: definitions and prototype changes

This change adds members to struct kimage to facilitate crash
hotplug support.

This change also defines crash hotplug events and associated
prototypes.

Signed-off-by: Eric DeVolder <eric.devolder@...cle.com>
---
 include/linux/kexec.h | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/include/linux/kexec.h b/include/linux/kexec.h
index 0c994ae37729..13c238c2da48 100644
--- a/include/linux/kexec.h
+++ b/include/linux/kexec.h
@@ -299,6 +299,13 @@ struct kimage {
 
 	/* Information for loading purgatory */
 	struct purgatory_info purgatory_info;
+
+#ifdef CONFIG_CRASH_HOTPLUG
+	bool hotplug_event;
+	int offlinecpu;
+	bool elf_index_valid;
+	int elf_index;
+#endif
 #endif
 
 #ifdef CONFIG_IMA_KEXEC
@@ -315,6 +322,15 @@ struct kimage {
 	unsigned long elf_load_addr;
 };
 
+#ifdef CONFIG_CRASH_HOTPLUG
+void arch_crash_hotplug_handler(struct kimage *image,
+	unsigned int hp_action, unsigned long a, unsigned long b);
+#define KEXEC_CRASH_HP_REMOVE_CPU   0
+#define KEXEC_CRASH_HP_ADD_CPU      1
+#define KEXEC_CRASH_HP_REMOVE_MEMORY 2
+#define KEXEC_CRASH_HP_ADD_MEMORY   3
+#endif /* CONFIG_CRASH_HOTPLUG */
+
 /* kexec interface functions */
 extern void machine_kexec(struct kimage *image);
 extern int machine_kexec_prepare(struct kimage *image);
-- 
2.27.0