From:   Eric DeVolder <eric.devolder@oracle.com>
To:     linux-kernel@vger.kernel.org, x86@kernel.org,
        kexec@lists.infradead.org, ebiederm@xmission.com,
        dyoung@redhat.com, bhe@redhat.com, vgoyal@redhat.com
Cc:     tglx@linutronix.de, mingo@redhat.com, bp@alien8.de,
        dave.hansen@linux.intel.com, hpa@zytor.com,
        nramas@linux.microsoft.com, thomas.lendacky@amd.com,
        robh@kernel.org, efault@gmx.de, rppt@kernel.org,
        konrad.wilk@oracle.com, boris.ostrovsky@oracle.com,
        eric.devolder@oracle.com
Subject: [RFC v2 3/6] crash hp: definitions and prototype changes
Date:   Tue,  7 Dec 2021 14:52:01 -0500
Message-Id: <20211207195204.1582-4-eric.devolder@oracle.com>
In-Reply-To: <20211207195204.1582-1-eric.devolder@oracle.com>
References: <20211207195204.1582-1-eric.devolder@oracle.com>
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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@oracle.com>
---
 include/linux/kexec.h | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/include/linux/kexec.h b/include/linux/kexec.h
index 0c994ae37729..068f853f1c65 100644
--- a/include/linux/kexec.h
+++ b/include/linux/kexec.h
@@ -221,8 +221,9 @@ struct crash_mem {
 extern int crash_exclude_mem_range(struct crash_mem *mem,
 				   unsigned long long mstart,
 				   unsigned long long mend);
-extern int crash_prepare_elf64_headers(struct crash_mem *mem, int kernel_map,
-				       void **addr, unsigned long *sz);
+extern int crash_prepare_elf64_headers(struct kimage *image,
+					struct crash_mem *mem, int kernel_map,
+					void **addr, unsigned long *sz);
 #endif /* CONFIG_KEXEC_FILE */
 
 #ifdef CONFIG_KEXEC_ELF
@@ -299,6 +300,13 @@ 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 +323,15 @@ 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