Date:   Mon, 7 Mar 2022 14:16:42 +0800
From:   Shuai Xue <xueshuai@...ux.alibaba.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     rric@...nel.org, mchehab@...nel.org, tony.luck@...el.com,
        james.morse@....com, ardb@...nel.org, linux-edac@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org,
        zhangliguang@...ux.alibaba.com, zhuo.song@...ux.alibaba.com
Subject: Re: [PATCH v6 2/2] EDAC/ghes: use cper functions to avoid code
 duplication

Hi, Borislav,

在 2022/3/4 PM6:16, Borislav Petkov 写道:
> On Thu, Mar 03, 2022 at 08:26:26PM +0800, Shuai Xue wrote:
>> To Borislav: Sorry, I only delete the format change summary in this commit
>> log in this version. If I missed any comments, could you please point out
>> clearly? Thank you very much.
> 
> I can't be more clear than the below - I simply took your patch and
> heavily massaged it because it is a lot quicker this way.
> 
> You can compare it with your version and see what needed to be changed.
> And you can of course ask questios why, if it is not clear. But it
> should be - a shortlog of what I did is also in the commit message.
> 
> Now, when you look at the resulting patch you can see what the change
> does. Yours did more than one logical thing - which a patch should never
> do.
> 
> Also, I'd really really urge you to read
> 
> Documentation/process/submitting-patches.rst
> 
> carefully before sending other patches. I won't do this heavy editing
> in the future so you're going to have to read review comments and
> *incorporate* them into your patches before submitting them again.

Thank you very much for your valuable reworking. I see your concerns.

> You can test the below on your machine now to make sure it still
> performs as expected.

I have test this patch, it works well.

>       - rip out useless reformatting

I have a question about the format after this patch:

	[ 4578.277035] EDAC MC0: 1 CE single-symbol chipkill ECC on unknown memory (node: 0 card: 0 rank: 0 bank: 256 row: 11098 column: 1032 page:0x95ad2e offset:0x20 grain:1 syndrome:0x0 - APEI location: node: 0 card: 0 rank: 0 bank: 256 row: 11098 column: 1032)

Should we add a new patch to remove the 'space' delimiter after the colon?

Best Regards,
Shuai


> ---
> From: Shuai Xue <xueshuai@...ux.alibaba.com>
> Date: Thu, 3 Mar 2022 20:26:26 +0800
> Subject: [PATCH] EDAC/ghes: Unify CPER memory error location reporting
> 
> Switch the GHES EDAC memory error reporting functions to use the common
> CPER ones and get rid of code duplication.
> 
>   [ bp:
>       - rewrite commit message, remove useless text
>       - rip out useless reformatting
>       - align function params on the opening brace
>       - rename function to a more descriptive name
>       - drop useless function exports
>       - handle buffer lengths properly when printing other detail
>       - remove useless casting
>   ]
> 
> Signed-off-by: Shuai Xue <xueshuai@...ux.alibaba.com>
> Signed-off-by: Borislav Petkov <bp@...e.de>
> Link: https://lore.kernel.org/r/20220303122626.99740-3-xueshuai@linux.alibaba.com
> ---
>  drivers/edac/Kconfig        |   1 +
>  drivers/edac/ghes_edac.c    | 200 +++++++-----------------------------
>  drivers/firmware/efi/cper.c |   4 +-
>  include/linux/cper.h        |   2 +
>  4 files changed, 42 insertions(+), 165 deletions(-)
> 
> diff --git a/drivers/edac/Kconfig b/drivers/edac/Kconfig
> index 58ab63642e72..23f11554f400 100644
> --- a/drivers/edac/Kconfig
> +++ b/drivers/edac/Kconfig
> @@ -55,6 +55,7 @@ config EDAC_DECODE_MCE
>  config EDAC_GHES
>  	bool "Output ACPI APEI/GHES BIOS detected errors via EDAC"
>  	depends on ACPI_APEI_GHES && (EDAC=y)
> +	select UEFI_CPER
>  	help
>  	  Not all machines support hardware-driven error report. Some of those
>  	  provide a BIOS-driven error report mechanism via ACPI, using the
> diff --git a/drivers/edac/ghes_edac.c b/drivers/edac/ghes_edac.c
> index 6d1ddecbf0da..2805d5610300 100644
> --- a/drivers/edac/ghes_edac.c
> +++ b/drivers/edac/ghes_edac.c
> @@ -15,11 +15,13 @@
>  #include "edac_module.h"
>  #include <ras/ras_event.h>
>  
> +#define OTHER_DETAIL_LEN	400
> +
>  struct ghes_pvt {
>  	struct mem_ctl_info *mci;
>  
>  	/* Buffers for the error handling routine */
> -	char other_detail[400];
> +	char other_detail[OTHER_DETAIL_LEN];
>  	char msg[80];
>  };
>  
> @@ -235,8 +237,34 @@ static void ghes_scan_system(void)
>  	system_scanned = true;
>  }
>  
> +static int print_mem_error_other_detail(const struct cper_sec_mem_err *mem, char *msg,
> +					const char *location, unsigned int len)
> +{
> +	u32 n;
> +
> +	if (!msg)
> +		return 0;
> +
> +	n = 0;
> +	len -= 1;
> +
> +	n += scnprintf(msg + n, len - n, "APEI location: %s ", location);
> +
> +	if (!(mem->validation_bits & CPER_MEM_VALID_ERROR_STATUS))
> +		goto out;
> +
> +	n += scnprintf(msg + n, len - n, "status(0x%016llx): ", mem->error_status);
> +	n += scnprintf(msg + n, len - n, "%s ", cper_mem_err_status_str(mem->error_status));
> +
> +out:
> +	msg[n] = '\0';
> +
> +	return n;
> +}
> +
>  void ghes_edac_report_mem_error(int sev, struct cper_sec_mem_err *mem_err)
>  {
> +	struct cper_mem_err_compact cmem;
>  	struct edac_raw_error_desc *e;
>  	struct mem_ctl_info *mci;
>  	struct ghes_pvt *pvt;
> @@ -292,60 +320,10 @@ void ghes_edac_report_mem_error(int sev, struct cper_sec_mem_err *mem_err)
>  
>  	/* Error type, mapped on e->msg */
>  	if (mem_err->validation_bits & CPER_MEM_VALID_ERROR_TYPE) {
> +		u8 etype = mem_err->error_type;
> +
>  		p = pvt->msg;
> -		switch (mem_err->error_type) {
> -		case 0:
> -			p += sprintf(p, "Unknown");
> -			break;
> -		case 1:
> -			p += sprintf(p, "No error");
> -			break;
> -		case 2:
> -			p += sprintf(p, "Single-bit ECC");
> -			break;
> -		case 3:
> -			p += sprintf(p, "Multi-bit ECC");
> -			break;
> -		case 4:
> -			p += sprintf(p, "Single-symbol ChipKill ECC");
> -			break;
> -		case 5:
> -			p += sprintf(p, "Multi-symbol ChipKill ECC");
> -			break;
> -		case 6:
> -			p += sprintf(p, "Master abort");
> -			break;
> -		case 7:
> -			p += sprintf(p, "Target abort");
> -			break;
> -		case 8:
> -			p += sprintf(p, "Parity Error");
> -			break;
> -		case 9:
> -			p += sprintf(p, "Watchdog timeout");
> -			break;
> -		case 10:
> -			p += sprintf(p, "Invalid address");
> -			break;
> -		case 11:
> -			p += sprintf(p, "Mirror Broken");
> -			break;
> -		case 12:
> -			p += sprintf(p, "Memory Sparing");
> -			break;
> -		case 13:
> -			p += sprintf(p, "Scrub corrected error");
> -			break;
> -		case 14:
> -			p += sprintf(p, "Scrub uncorrected error");
> -			break;
> -		case 15:
> -			p += sprintf(p, "Physical Memory Map-out event");
> -			break;
> -		default:
> -			p += sprintf(p, "reserved error (%d)",
> -				     mem_err->error_type);
> -		}
> +		p += snprintf(p, sizeof(pvt->msg), "%s", cper_mem_err_type_str(etype));
>  	} else {
>  		strcpy(pvt->msg, "unknown error");
>  	}
> @@ -362,52 +340,19 @@ void ghes_edac_report_mem_error(int sev, struct cper_sec_mem_err *mem_err)
>  
>  	/* Memory error location, mapped on e->location */
>  	p = e->location;
> -	if (mem_err->validation_bits & CPER_MEM_VALID_NODE)
> -		p += sprintf(p, "node:%d ", mem_err->node);
> -	if (mem_err->validation_bits & CPER_MEM_VALID_CARD)
> -		p += sprintf(p, "card:%d ", mem_err->card);
> -	if (mem_err->validation_bits & CPER_MEM_VALID_MODULE)
> -		p += sprintf(p, "module:%d ", mem_err->module);
> -	if (mem_err->validation_bits & CPER_MEM_VALID_RANK_NUMBER)
> -		p += sprintf(p, "rank:%d ", mem_err->rank);
> -	if (mem_err->validation_bits & CPER_MEM_VALID_BANK)
> -		p += sprintf(p, "bank:%d ", mem_err->bank);
> -	if (mem_err->validation_bits & CPER_MEM_VALID_BANK_GROUP)
> -		p += sprintf(p, "bank_group:%d ",
> -			     mem_err->bank >> CPER_MEM_BANK_GROUP_SHIFT);
> -	if (mem_err->validation_bits & CPER_MEM_VALID_BANK_ADDRESS)
> -		p += sprintf(p, "bank_address:%d ",
> -			     mem_err->bank & CPER_MEM_BANK_ADDRESS_MASK);
> -	if (mem_err->validation_bits & (CPER_MEM_VALID_ROW | CPER_MEM_VALID_ROW_EXT)) {
> -		u32 row = mem_err->row;
> -
> -		row |= cper_get_mem_extension(mem_err->validation_bits, mem_err->extended);
> -		p += sprintf(p, "row:%d ", row);
> -	}
> -	if (mem_err->validation_bits & CPER_MEM_VALID_COLUMN)
> -		p += sprintf(p, "col:%d ", mem_err->column);
> -	if (mem_err->validation_bits & CPER_MEM_VALID_BIT_POSITION)
> -		p += sprintf(p, "bit_pos:%d ", mem_err->bit_pos);
> +	cper_mem_err_pack(mem_err, &cmem);
> +	p += cper_mem_err_location(&cmem, p);
> +
>  	if (mem_err->validation_bits & CPER_MEM_VALID_MODULE_HANDLE) {
> -		const char *bank = NULL, *device = NULL;
>  		struct dimm_info *dimm;
>  
> -		dmi_memdev_name(mem_err->mem_dev_handle, &bank, &device);
> -		if (bank != NULL && device != NULL)
> -			p += sprintf(p, "DIMM location:%s %s ", bank, device);
> -		else
> -			p += sprintf(p, "DIMM DMI handle: 0x%.4x ",
> -				     mem_err->mem_dev_handle);
> -
> +		p += cper_dimm_err_location(&cmem, p);
>  		dimm = find_dimm_by_handle(mci, mem_err->mem_dev_handle);
>  		if (dimm) {
>  			e->top_layer = dimm->idx;
>  			strcpy(e->label, dimm->label);
>  		}
>  	}
> -	if (mem_err->validation_bits & CPER_MEM_VALID_CHIP_ID)
> -		p += sprintf(p, "chipID: %d ",
> -			     mem_err->extended >> CPER_MEM_CHIP_ID_SHIFT);
>  	if (p > e->location)
>  		*(p - 1) = '\0';
>  
> @@ -416,78 +361,7 @@ void ghes_edac_report_mem_error(int sev, struct cper_sec_mem_err *mem_err)
>  
>  	/* All other fields are mapped on e->other_detail */
>  	p = pvt->other_detail;
> -	p += snprintf(p, sizeof(pvt->other_detail),
> -		"APEI location: %s ", e->location);
> -	if (mem_err->validation_bits & CPER_MEM_VALID_ERROR_STATUS) {
> -		u64 status = mem_err->error_status;
> -
> -		p += sprintf(p, "status(0x%016llx): ", (long long)status);
> -		switch ((status >> 8) & 0xff) {
> -		case 1:
> -			p += sprintf(p, "Error detected internal to the component ");
> -			break;
> -		case 16:
> -			p += sprintf(p, "Error detected in the bus ");
> -			break;
> -		case 4:
> -			p += sprintf(p, "Storage error in DRAM memory ");
> -			break;
> -		case 5:
> -			p += sprintf(p, "Storage error in TLB ");
> -			break;
> -		case 6:
> -			p += sprintf(p, "Storage error in cache ");
> -			break;
> -		case 7:
> -			p += sprintf(p, "Error in one or more functional units ");
> -			break;
> -		case 8:
> -			p += sprintf(p, "component failed self test ");
> -			break;
> -		case 9:
> -			p += sprintf(p, "Overflow or undervalue of internal queue ");
> -			break;
> -		case 17:
> -			p += sprintf(p, "Virtual address not found on IO-TLB or IO-PDIR ");
> -			break;
> -		case 18:
> -			p += sprintf(p, "Improper access error ");
> -			break;
> -		case 19:
> -			p += sprintf(p, "Access to a memory address which is not mapped to any component ");
> -			break;
> -		case 20:
> -			p += sprintf(p, "Loss of Lockstep ");
> -			break;
> -		case 21:
> -			p += sprintf(p, "Response not associated with a request ");
> -			break;
> -		case 22:
> -			p += sprintf(p, "Bus parity error - must also set the A, C, or D Bits ");
> -			break;
> -		case 23:
> -			p += sprintf(p, "Detection of a PATH_ERROR ");
> -			break;
> -		case 25:
> -			p += sprintf(p, "Bus operation timeout ");
> -			break;
> -		case 26:
> -			p += sprintf(p, "A read was issued to data that has been poisoned ");
> -			break;
> -		default:
> -			p += sprintf(p, "reserved ");
> -			break;
> -		}
> -	}
> -	if (mem_err->validation_bits & CPER_MEM_VALID_REQUESTOR_ID)
> -		p += sprintf(p, "requestorID: 0x%016llx ",
> -			     (long long)mem_err->requestor_id);
> -	if (mem_err->validation_bits & CPER_MEM_VALID_RESPONDER_ID)
> -		p += sprintf(p, "responderID: 0x%016llx ",
> -			     (long long)mem_err->responder_id);
> -	if (mem_err->validation_bits & CPER_MEM_VALID_TARGET_ID)
> -		p += sprintf(p, "targetID: 0x%016llx ",
> -			     (long long)mem_err->responder_id);
> +	p += print_mem_error_other_detail(mem_err, p, e->location, OTHER_DETAIL_LEN);
>  	if (p > pvt->other_detail)
>  		*(p - 1) = '\0';
>  
> diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
> index 34eeaa59f04a..215c778fb33c 100644
> --- a/drivers/firmware/efi/cper.c
> +++ b/drivers/firmware/efi/cper.c
> @@ -237,7 +237,7 @@ const char *cper_mem_err_status_str(u64 status)
>  }
>  EXPORT_SYMBOL_GPL(cper_mem_err_status_str);
>  
> -static int cper_mem_err_location(struct cper_mem_err_compact *mem, char *msg)
> +int cper_mem_err_location(struct cper_mem_err_compact *mem, char *msg)
>  {
>  	u32 len, n;
>  
> @@ -291,7 +291,7 @@ static int cper_mem_err_location(struct cper_mem_err_compact *mem, char *msg)
>  	return n;
>  }
>  
> -static int cper_dimm_err_location(struct cper_mem_err_compact *mem, char *msg)
> +int cper_dimm_err_location(struct cper_mem_err_compact *mem, char *msg)
>  {
>  	u32 len, n;
>  	const char *bank = NULL, *device = NULL;
> diff --git a/include/linux/cper.h b/include/linux/cper.h
> index 5b1dd27b317d..eacb7dd7b3af 100644
> --- a/include/linux/cper.h
> +++ b/include/linux/cper.h
> @@ -569,5 +569,7 @@ void cper_print_proc_arm(const char *pfx,
>  			 const struct cper_sec_proc_arm *proc);
>  void cper_print_proc_ia(const char *pfx,
>  			const struct cper_sec_proc_ia *proc);
> +int cper_mem_err_location(struct cper_mem_err_compact *mem, char *msg);
> +int cper_dimm_err_location(struct cper_mem_err_compact *mem, char *msg);
>  
>  #endif

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