[PATCH v4] vmcoreinfo: Track and log recoverable hardware errors

[Breno Leitao]

On Mon, Aug 04, 2025 at 10:41:05AM -0700, Dave Hansen wrote:
> On 8/4/25 10:12, Breno Leitao wrote:
> ...
> > +- These errros are divided by are, which includes CPU, Memory, PCI, CXL and
> > +  others.
> 
> There's a double typo in there I think:
> 
> 	errros => errors
> and
> 	are,=>area,
> 
> > --- a/include/linux/vmcore_info.h
> > +++ b/include/linux/vmcore_info.h
> > @@ -77,4 +77,20 @@ extern u32 *vmcoreinfo_note;
> >  Elf_Word *append_elf_note(Elf_Word *buf, char *name, unsigned int type,
> >  			  void *data, size_t data_len);
> >  void final_note(Elf_Word *buf);
> > +
> > +enum hwerr_error_type {
> > +	HWERR_RECOV_CPU,
> > +	HWERR_RECOV_MEMORY,
> > +	HWERR_RECOV_PCI,
> > +	HWERR_RECOV_CXL,
> > +	HWERR_RECOV_OTHERS,
> > +	HWERR_RECOV_MAX,
> > +};
> That enum needs to go into an abi header.

Agree. I came up with something like the change below. Is it the right
thing to mark the enum as stable ABI?

Thanks
--breno

diff --git a/include/linux/vmcore_info.h b/include/linux/vmcore_info.h
index 37e003ae52626..e71518caacdfc 100644
--- a/include/linux/vmcore_info.h
+++ b/include/linux/vmcore_info.h
@@ -5,6 +5,7 @@
 #include <linux/linkage.h>
 #include <linux/elfcore.h>
 #include <linux/elf.h>
+#include <uapi/linux/vmcore.h>

 #define CRASH_CORE_NOTE_HEAD_BYTES ALIGN(sizeof(struct elf_note), 4)
 #define CRASH_CORE_NOTE_NAME_BYTES ALIGN(sizeof(NN_PRSTATUS), 4)
@@ -77,4 +78,11 @@ extern u32 *vmcoreinfo_note;
 Elf_Word *append_elf_note(Elf_Word *buf, char *name, unsigned int type,
                          void *data, size_t data_len);
 void final_note(Elf_Word *buf);
+
+#ifdef CONFIG_VMCORE_INFO
+void hwerr_log_error_type(enum hwerr_error_type src);
+#else
+static inline void hwerr_log_error_type(enum hwerr_error_type src) {};
+#endif
+
 #endif /* LINUX_VMCORE_INFO_H */
diff --git a/include/uapi/linux/vmcore.h b/include/uapi/linux/vmcore.h
index 3e9da91866ffd..2ba89fafa518a 100644
--- a/include/uapi/linux/vmcore.h
+++ b/include/uapi/linux/vmcore.h
@@ -15,4 +15,13 @@ struct vmcoredd_header {
        __u8 dump_name[VMCOREDD_MAX_NAME_BYTES]; /* Device dump's name */
 };

+enum hwerr_error_type {
+       HWERR_RECOV_CPU,
+       HWERR_RECOV_MEMORY,
+       HWERR_RECOV_PCI,
+       HWERR_RECOV_CXL,
+       HWERR_RECOV_OTHERS,
+       HWERR_RECOV_MAX,
+};
+
 #endif /* _UAPI_VMCORE_H */