[PATCH v4 0/2] Add an API for edac device, for mulriple errors

[PATCH v4 0/2] Add an API for edac device, for mulriple errors

[Hanna Hawa]

Add an API for EDAC device to report for multiple errors, and move the
old report function to use the new API.

Changes from v3:
----------------
- Move count check to inline function
- Fix count variable describtion
  (Reported-by: kbuild test robot <lkp@intel.com>)

Changes from v2:
----------------
- Remove copy of edac_device_handle_*() functions, modify the existing
functions.

Changes from v1:
----------------
- use 'unsigned int' instead of u16
- update variable name to be count
- remove WARN_ON and simply exit if count is zero
- add inline functions in header file

Hanna Hawa (2):
  edac: Add an API for edac device to report for multiple errors
  edac: move edac_device_handle_*() API functions to header

 drivers/edac/edac_device.c | 44 +++++++++++++++++----------------
 drivers/edac/edac_device.h | 50 +++++++++++++++++++++++++++++++++-----
 2 files changed, 67 insertions(+), 27 deletions(-)

-- 
2.17.1

[PATCH v4 1/2] edac: Add an API for edac device to report for multiple errors

[Hanna Hawa]

Add an API for EDAC device to report multiple errors with same type.

Signed-off-by: Hanna Hawa <hhhawa@amazon.com>
Acked-by: Robert Richter <rrichter@marvell.com>
---
 drivers/edac/edac_device.c | 56 ++++++++++++++++++++++++--------------
 drivers/edac/edac_device.h | 47 ++++++++++++++++++++++++++++++++
 2 files changed, 83 insertions(+), 20 deletions(-)

diff --git a/drivers/edac/edac_device.c b/drivers/edac/edac_device.c
index 65cf2b9355c4..6701fd3a8ce0 100644
--- a/drivers/edac/edac_device.c
+++ b/drivers/edac/edac_device.c
@@ -555,8 +555,9 @@ static inline int edac_device_get_panic_on_ue(struct edac_device_ctl_info
 	return edac_dev->panic_on_ue;
 }
 
-void edac_device_handle_ce(struct edac_device_ctl_info *edac_dev,
-			int inst_nr, int block_nr, const char *msg)
+void __edac_device_handle_ce(struct edac_device_ctl_info *edac_dev,
+			     unsigned int count, int inst_nr, int block_nr,
+			     const char *msg)
 {
 	struct edac_device_instance *instance;
 	struct edac_device_block *block = NULL;
@@ -582,23 +583,24 @@ void edac_device_handle_ce(struct edac_device_ctl_info *edac_dev,
 
 	if (instance->nr_blocks > 0) {
 		block = instance->blocks + block_nr;
-		block->counters.ce_count++;
+		block->counters.ce_count += count;
 	}
 
 	/* Propagate the count up the 'totals' tree */
-	instance->counters.ce_count++;
-	edac_dev->counters.ce_count++;
+	instance->counters.ce_count += count;
+	edac_dev->counters.ce_count += count;
 
 	if (edac_device_get_log_ce(edac_dev))
 		edac_device_printk(edac_dev, KERN_WARNING,
-				"CE: %s instance: %s block: %s '%s'\n",
-				edac_dev->ctl_name, instance->name,
-				block ? block->name : "N/A", msg);
+				   "CE: %s instance: %s block: %s count: %d '%s'\n",
+				   edac_dev->ctl_name, instance->name,
+				   block ? block->name : "N/A", count, msg);
 }
-EXPORT_SYMBOL_GPL(edac_device_handle_ce);
+EXPORT_SYMBOL_GPL(__edac_device_handle_ce);
 
-void edac_device_handle_ue(struct edac_device_ctl_info *edac_dev,
-			int inst_nr, int block_nr, const char *msg)
+void __edac_device_handle_ue(struct edac_device_ctl_info *edac_dev,
+			     unsigned int count, int inst_nr, int block_nr,
+			     const char *msg)
 {
 	struct edac_device_instance *instance;
 	struct edac_device_block *block = NULL;
@@ -624,22 +626,36 @@ void edac_device_handle_ue(struct edac_device_ctl_info *edac_dev,
 
 	if (instance->nr_blocks > 0) {
 		block = instance->blocks + block_nr;
-		block->counters.ue_count++;
+		block->counters.ue_count += count;
 	}
 
 	/* Propagate the count up the 'totals' tree */
-	instance->counters.ue_count++;
-	edac_dev->counters.ue_count++;
+	instance->counters.ue_count += count;
+	edac_dev->counters.ue_count += count;
 
 	if (edac_device_get_log_ue(edac_dev))
 		edac_device_printk(edac_dev, KERN_EMERG,
-				"UE: %s instance: %s block: %s '%s'\n",
-				edac_dev->ctl_name, instance->name,
-				block ? block->name : "N/A", msg);
+				   "UE: %s instance: %s block: %s count: %d '%s'\n",
+				   edac_dev->ctl_name, instance->name,
+				   block ? block->name : "N/A", count, msg);
 
 	if (edac_device_get_panic_on_ue(edac_dev))
-		panic("EDAC %s: UE instance: %s block %s '%s'\n",
-			edac_dev->ctl_name, instance->name,
-			block ? block->name : "N/A", msg);
+		panic("EDAC %s: UE instance: %s block %s count: %d '%s'\n",
+		      edac_dev->ctl_name, instance->name,
+		      block ? block->name : "N/A", count, msg);
+}
+EXPORT_SYMBOL_GPL(__edac_device_handle_ue);
+
+void edac_device_handle_ce(struct edac_device_ctl_info *edac_dev,
+			int inst_nr, int block_nr, const char *msg)
+{
+	__edac_device_handle_ce(edac_dev, 1, inst_nr, block_nr, msg);
+}
+EXPORT_SYMBOL_GPL(edac_device_handle_ce);
+
+void edac_device_handle_ue(struct edac_device_ctl_info *edac_dev,
+			int inst_nr, int block_nr, const char *msg)
+{
+	__edac_device_handle_ue(edac_dev, 1, inst_nr, block_nr, msg);
 }
 EXPORT_SYMBOL_GPL(edac_device_handle_ue);
diff --git a/drivers/edac/edac_device.h b/drivers/edac/edac_device.h
index 1aaba74ae411..7869f036138a 100644
--- a/drivers/edac/edac_device.h
+++ b/drivers/edac/edac_device.h
@@ -285,6 +285,33 @@ extern int edac_device_add_device(struct edac_device_ctl_info *edac_dev);
  */
 extern struct edac_device_ctl_info *edac_device_del_device(struct device *dev);
 
+/**
+ * __edac_device_handle_ue():
+ *	perform a common output and handling of an 'edac_dev' UE event
+ *
+ * @edac_dev: pointer to struct &edac_device_ctl_info
+ * @count: number of errors of the same type
+ * @inst_nr: number of the instance where the UE error happened
+ * @block_nr: number of the block where the UE error happened
+ * @msg: message to be printed
+ */
+void __edac_device_handle_ue(struct edac_device_ctl_info *edac_dev,
+			     unsigned int count, int inst_nr, int block_nr,
+			     const char *msg);
+/**
+ * __edac_device_handle_ce():
+ *	perform a common output and handling of an 'edac_dev' CE event
+ *
+ * @edac_dev: pointer to struct &edac_device_ctl_info
+ * @count: number of errors of the same type
+ * @inst_nr: number of the instance where the CE error happened
+ * @block_nr: number of the block where the CE error happened
+ * @msg: message to be printed
+ */
+void __edac_device_handle_ce(struct edac_device_ctl_info *edac_dev,
+			     unsigned int count, int inst_nr, int block_nr,
+			     const char *msg);
+
 /**
  * edac_device_handle_ue():
  *	perform a common output and handling of an 'edac_dev' UE event
@@ -308,6 +335,26 @@ extern void edac_device_handle_ue(struct edac_device_ctl_info *edac_dev,
 extern void edac_device_handle_ce(struct edac_device_ctl_info *edac_dev,
 				int inst_nr, int block_nr, const char *msg);
 
+static inline void edac_device_handle_ce_count(struct edac_device_ctl_info *edac_dev,
+					       unsigned int count, int inst_nr,
+					       int block_nr, const char *msg)
+{
+	if (!count)
+		return;
+
+	__edac_device_handle_ce(edac_dev, count, inst_nr, block_nr, msg);
+}
+
+static inline void edac_device_handle_ue_count(struct edac_device_ctl_info *edac_dev,
+					       unsigned int count, int inst_nr,
+					       int block_nr, const char *msg)
+{
+	if (!count)
+		return;
+
+	__edac_device_handle_ue(edac_dev, count, inst_nr, block_nr, msg);
+}
+
 /**
  * edac_device_alloc_index: Allocate a unique device index number
  *
-- 
2.17.1

[PATCH v4 2/2] edac: move edac_device_handle_*() API functions to header

[Hanna Hawa]

Move edac_device_handle_*() functions from source file to header file as
inline funtcion that use the new API with single error.

Signed-off-by: Hanna Hawa <hhhawa@amazon.com>
Acked-by: Robert Richter <rrichter@marvell.com>
---
 drivers/edac/edac_device.c | 14 --------------
 drivers/edac/edac_device.h | 35 +++++++++++++----------------------
 2 files changed, 13 insertions(+), 36 deletions(-)

diff --git a/drivers/edac/edac_device.c b/drivers/edac/edac_device.c
index 6701fd3a8ce0..9460d892d222 100644
--- a/drivers/edac/edac_device.c
+++ b/drivers/edac/edac_device.c
@@ -645,17 +645,3 @@ void __edac_device_handle_ue(struct edac_device_ctl_info *edac_dev,
 		      block ? block->name : "N/A", count, msg);
 }
 EXPORT_SYMBOL_GPL(__edac_device_handle_ue);
-
-void edac_device_handle_ce(struct edac_device_ctl_info *edac_dev,
-			int inst_nr, int block_nr, const char *msg)
-{
-	__edac_device_handle_ce(edac_dev, 1, inst_nr, block_nr, msg);
-}
-EXPORT_SYMBOL_GPL(edac_device_handle_ce);
-
-void edac_device_handle_ue(struct edac_device_ctl_info *edac_dev,
-			int inst_nr, int block_nr, const char *msg)
-{
-	__edac_device_handle_ue(edac_dev, 1, inst_nr, block_nr, msg);
-}
-EXPORT_SYMBOL_GPL(edac_device_handle_ue);
diff --git a/drivers/edac/edac_device.h b/drivers/edac/edac_device.h
index 7869f036138a..e1d4e2544e24 100644
--- a/drivers/edac/edac_device.h
+++ b/drivers/edac/edac_device.h
@@ -312,28 +312,19 @@ void __edac_device_handle_ce(struct edac_device_ctl_info *edac_dev,
 			     unsigned int count, int inst_nr, int block_nr,
 			     const char *msg);
 
-/**
- * edac_device_handle_ue():
- *	perform a common output and handling of an 'edac_dev' UE event
- *
- * @edac_dev: pointer to struct &edac_device_ctl_info
- * @inst_nr: number of the instance where the UE error happened
- * @block_nr: number of the block where the UE error happened
- * @msg: message to be printed
- */
-extern void edac_device_handle_ue(struct edac_device_ctl_info *edac_dev,
-				int inst_nr, int block_nr, const char *msg);
-/**
- * edac_device_handle_ce():
- *	perform a common output and handling of an 'edac_dev' CE event
- *
- * @edac_dev: pointer to struct &edac_device_ctl_info
- * @inst_nr: number of the instance where the CE error happened
- * @block_nr: number of the block where the CE error happened
- * @msg: message to be printed
- */
-extern void edac_device_handle_ce(struct edac_device_ctl_info *edac_dev,
-				int inst_nr, int block_nr, const char *msg);
+static inline void edac_device_handle_ce(struct edac_device_ctl_info *edac_dev,
+					 int inst_nr, int block_nr,
+					 const char *msg)
+{
+	__edac_device_handle_ce(edac_dev, 1, inst_nr, block_nr, msg);
+}
+
+static inline void edac_device_handle_ue(struct edac_device_ctl_info *edac_dev,
+					 int inst_nr, int block_nr,
+					 const char *msg)
+{
+	__edac_device_handle_ue(edac_dev, 1, inst_nr, block_nr, msg);
+}
 
 static inline void edac_device_handle_ce_count(struct edac_device_ctl_info *edac_dev,
 					       unsigned int count, int inst_nr,
-- 
2.17.1

Re: [PATCH v4 0/2] Add an API for edac device, for mulriple errors

[Robert Richter]

On 23.09.19 20:17:39, Hanna Hawa wrote:
> Add an API for EDAC device to report for multiple errors, and move the
> old report function to use the new API.
> 
> Changes from v3:
> ----------------
> - Move count check to inline function
> - Fix count variable describtion
>   (Reported-by: kbuild test robot <lkp@intel.com>)

Looks good to me. If another respin happens, please fix the 80 char
limitation for the static inline functions, you could line break after
the type definition.

Thanks,

-Robert

Re: [PATCH v4 1/2] edac: Add an API for edac device to report for multiple errors

[Borislav Petkov]

On Mon, Sep 23, 2019 at 08:17:40PM +0100, Hanna Hawa wrote:
> +void edac_device_handle_ce(struct edac_device_ctl_info *edac_dev,
> +			int inst_nr, int block_nr, const char *msg)
> +{
> +	__edac_device_handle_ce(edac_dev, 1, inst_nr, block_nr, msg);
> +}
> +EXPORT_SYMBOL_GPL(edac_device_handle_ce);

Eww, I don't like that: exporting the function *and* the __ counterpart.
The user will get confused and that is unnecessary.

See below for a better version. This way you solve the whole deal with a
single patch.

---
From: Hanna Hawa <hhhawa@amazon.com>
Date: Mon, 23 Sep 2019 20:17:40 +0100
Subject: [PATCH] EDAC/device: Rework error logging API

Make the main workhorse the "count" functions which can log a @count
of errors. Have the current APIs edac_device_handle_{ce,ue}() call
the _count() variants and this way keep the exported symbols number
unchanged.

 [ bp: Rewrite. ]

Signed-off-by: Hanna Hawa <hhhawa@amazon.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: benh@amazon.com
Cc: dwmw@amazon.co.uk
Cc: hanochu@amazon.com
Cc: James Morse <james.morse@arm.com>
Cc: jonnyc@amazon.com
Cc: linux-edac <linux-edac@vger.kernel.org>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: ronenk@amazon.com
Cc: talel@amazon.com
Cc: Tony Luck <tony.luck@intel.com>
Link: https://lkml.kernel.org/r/20190923191741.29322-2-hhhawa@amazon.com
---
 drivers/edac/edac_device.c | 44 ++++++++++++++++---------------
 drivers/edac/edac_device.h | 54 ++++++++++++++++++++++++++++++--------
 2 files changed, 66 insertions(+), 32 deletions(-)

diff --git a/drivers/edac/edac_device.c b/drivers/edac/edac_device.c
index 65cf2b9355c4..d4d8bed5b55d 100644
--- a/drivers/edac/edac_device.c
+++ b/drivers/edac/edac_device.c
@@ -555,8 +555,9 @@ static inline int edac_device_get_panic_on_ue(struct edac_device_ctl_info
 	return edac_dev->panic_on_ue;
 }
 
-void edac_device_handle_ce(struct edac_device_ctl_info *edac_dev,
-			int inst_nr, int block_nr, const char *msg)
+void edac_device_handle_ce_count(struct edac_device_ctl_info *edac_dev,
+				 unsigned int count, int inst_nr, int block_nr,
+				 const char *msg)
 {
 	struct edac_device_instance *instance;
 	struct edac_device_block *block = NULL;
@@ -582,23 +583,24 @@ void edac_device_handle_ce(struct edac_device_ctl_info *edac_dev,
 
 	if (instance->nr_blocks > 0) {
 		block = instance->blocks + block_nr;
-		block->counters.ce_count++;
+		block->counters.ce_count += count;
 	}
 
 	/* Propagate the count up the 'totals' tree */
-	instance->counters.ce_count++;
-	edac_dev->counters.ce_count++;
+	instance->counters.ce_count += count;
+	edac_dev->counters.ce_count += count;
 
 	if (edac_device_get_log_ce(edac_dev))
 		edac_device_printk(edac_dev, KERN_WARNING,
-				"CE: %s instance: %s block: %s '%s'\n",
-				edac_dev->ctl_name, instance->name,
-				block ? block->name : "N/A", msg);
+				   "CE: %s instance: %s block: %s count: %d '%s'\n",
+				   edac_dev->ctl_name, instance->name,
+				   block ? block->name : "N/A", count, msg);
 }
-EXPORT_SYMBOL_GPL(edac_device_handle_ce);
+EXPORT_SYMBOL_GPL(edac_device_handle_ce_count);
 
-void edac_device_handle_ue(struct edac_device_ctl_info *edac_dev,
-			int inst_nr, int block_nr, const char *msg)
+void edac_device_handle_ue_count(struct edac_device_ctl_info *edac_dev,
+				 unsigned int count, int inst_nr, int block_nr,
+				 const char *msg)
 {
 	struct edac_device_instance *instance;
 	struct edac_device_block *block = NULL;
@@ -624,22 +626,22 @@ void edac_device_handle_ue(struct edac_device_ctl_info *edac_dev,
 
 	if (instance->nr_blocks > 0) {
 		block = instance->blocks + block_nr;
-		block->counters.ue_count++;
+		block->counters.ue_count += count;
 	}
 
 	/* Propagate the count up the 'totals' tree */
-	instance->counters.ue_count++;
-	edac_dev->counters.ue_count++;
+	instance->counters.ue_count += count;
+	edac_dev->counters.ue_count += count;
 
 	if (edac_device_get_log_ue(edac_dev))
 		edac_device_printk(edac_dev, KERN_EMERG,
-				"UE: %s instance: %s block: %s '%s'\n",
-				edac_dev->ctl_name, instance->name,
-				block ? block->name : "N/A", msg);
+				   "UE: %s instance: %s block: %s count: %d '%s'\n",
+				   edac_dev->ctl_name, instance->name,
+				   block ? block->name : "N/A", count, msg);
 
 	if (edac_device_get_panic_on_ue(edac_dev))
-		panic("EDAC %s: UE instance: %s block %s '%s'\n",
-			edac_dev->ctl_name, instance->name,
-			block ? block->name : "N/A", msg);
+		panic("EDAC %s: UE instance: %s block %s count: %d '%s'\n",
+		      edac_dev->ctl_name, instance->name,
+		      block ? block->name : "N/A", count, msg);
 }
-EXPORT_SYMBOL_GPL(edac_device_handle_ue);
+EXPORT_SYMBOL_GPL(edac_device_handle_ue_count);
diff --git a/drivers/edac/edac_device.h b/drivers/edac/edac_device.h
index 1aaba74ae411..c4c0e0bdce14 100644
--- a/drivers/edac/edac_device.h
+++ b/drivers/edac/edac_device.h
@@ -286,27 +286,60 @@ extern int edac_device_add_device(struct edac_device_ctl_info *edac_dev);
 extern struct edac_device_ctl_info *edac_device_del_device(struct device *dev);
 
 /**
- * edac_device_handle_ue():
- *	perform a common output and handling of an 'edac_dev' UE event
+ * Log correctable errors.
  *
  * @edac_dev: pointer to struct &edac_device_ctl_info
- * @inst_nr: number of the instance where the UE error happened
- * @block_nr: number of the block where the UE error happened
+ * @inst_nr: number of the instance where the CE error happened
+ * @count: Number of errors to log.
+ * @block_nr: number of the block where the CE error happened
+ * @msg: message to be printed
+ */
+void edac_device_handle_ce_count(struct edac_device_ctl_info *edac_dev,
+				 unsigned int count, int inst_nr, int block_nr,
+				 const char *msg);
+
+/**
+ * Log uncorrectable errors.
+ *
+ * @edac_dev: pointer to struct &edac_device_ctl_info
+ * @inst_nr: number of the instance where the CE error happened
+ * @count: Number of errors to log.
+ * @block_nr: number of the block where the CE error happened
  * @msg: message to be printed
  */
-extern void edac_device_handle_ue(struct edac_device_ctl_info *edac_dev,
-				int inst_nr, int block_nr, const char *msg);
+void edac_device_handle_ue_count(struct edac_device_ctl_info *edac_dev,
+				 unsigned int count, int inst_nr, int block_nr,
+				 const char *msg);
+
 /**
- * edac_device_handle_ce():
- *	perform a common output and handling of an 'edac_dev' CE event
+ * edac_device_handle_ce(): Log a single correctable error
  *
  * @edac_dev: pointer to struct &edac_device_ctl_info
  * @inst_nr: number of the instance where the CE error happened
  * @block_nr: number of the block where the CE error happened
  * @msg: message to be printed
  */
-extern void edac_device_handle_ce(struct edac_device_ctl_info *edac_dev,
-				int inst_nr, int block_nr, const char *msg);
+static inline void
+edac_device_handle_ce(struct edac_device_ctl_info *edac_dev, int inst_nr,
+		      int block_nr, const char *msg)
+{
+	edac_device_handle_ce_count(edac_dev, 1, inst_nr, block_nr, msg);
+}
+
+/**
+ * edac_device_handle_ue(): Log a single uncorrectable error
+ *
+ * @edac_dev: pointer to struct &edac_device_ctl_info
+ * @inst_nr: number of the instance where the UE error happened
+ * @block_nr: number of the block where the UE error happened
+ * @msg: message to be printed
+ */
+static inline void
+edac_device_handle_ue(struct edac_device_ctl_info *edac_dev, int inst_nr,
+		      int block_nr, const char *msg)
+{
+	edac_device_handle_ue_count(edac_dev, 1, inst_nr, block_nr, msg);
+}
 
 /**
  * edac_device_alloc_index: Allocate a unique device index number
@@ -316,5 +349,4 @@ extern void edac_device_handle_ce(struct edac_device_ctl_info *edac_dev,
  */
 extern int edac_device_alloc_index(void);
 extern const char *edac_layer_name[];
-
 #endif
-- 
2.21.0

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette

Re: [PATCH v4 1/2] edac: Add an API for edac device to report for multiple errors

[Robert Richter]

On 30.09.19 16:50:46, Borislav Petkov wrote:
> ----------------------------------------------------------------------
> On Mon, Sep 23, 2019 at 08:17:40PM +0100, Hanna Hawa wrote:
> > +void edac_device_handle_ce(struct edac_device_ctl_info *edac_dev,
> > +			int inst_nr, int block_nr, const char *msg)
> > +{
> > +	__edac_device_handle_ce(edac_dev, 1, inst_nr, block_nr, msg);
> > +}
> > +EXPORT_SYMBOL_GPL(edac_device_handle_ce);
> 
> Eww, I don't like that: exporting the function *and* the __ counterpart.
> The user will get confused and that is unnecessary.

It is *not* the counterpart. The __* version already has the
additional count argument in. There are 2 patches:

1) introduce new function __edac_device_handle_ce/ue() including the
   *_count() inline functions, but keep the old symbols (note the
   count=1 parameter).

2) remove old symbol edac_device_handle_ce/ue() and replace it with an
   inline function to use the counterpart symbol too.

The first patch only adds functionality but keeps the abi. Thus it
makes a backport easier. The 2nd switches completely to the new
function.

-Robert

Re: [PATCH v4 1/2] edac: Add an API for edac device to report for multiple errors

[Borislav Petkov]

On Tue, Oct 01, 2019 at 06:56:58AM +0000, Robert Richter wrote:
> It is *not* the counterpart. The __* version already has the...

Lemme cut to the chase:

"Make the main workhorse the "count" functions which can log a @count
of errors. Have the current APIs edac_device_handle_{ce,ue}() call
the _count() variants and this way keep the exported symbols number
unchanged."

I want to see exactly *two* pairs of functions:

edac_device_handle_{ce,ue}_count	- logs a @count of errors
edac_device_handle_{ce,ue}		- logs a single error

Not three pairs. I.e., the "__" versions are not needed.

> The first patch only adds functionality but keeps the abi. Thus it
> makes a backport easier.

Works just the same with my version - single backport.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette

Re: [PATCH v4 1/2] edac: Add an API for edac device to report for multiple errors

[Robert Richter]

On 01.10.19 10:32:42, Borislav Petkov wrote:

> ----------------------------------------------------------------------
> On Tue, Oct 01, 2019 at 06:56:58AM +0000, Robert Richter wrote:
> > It is *not* the counterpart. The __* version already has the...
> 
> Lemme cut to the chase:
> 
> "Make the main workhorse the "count" functions which can log a @count
> of errors. Have the current APIs edac_device_handle_{ce,ue}() call
> the _count() variants and this way keep the exported symbols number
> unchanged."
> 
> I want to see exactly *two* pairs of functions:
> 
> edac_device_handle_{ce,ue}_count	- logs a @count of errors
> edac_device_handle_{ce,ue}		- logs a single error
> 
> Not three pairs. I.e., the "__" versions are not needed.
> 
> > The first patch only adds functionality but keeps the abi. Thus it
> > makes a backport easier.
> 
> Works just the same with my version - single backport.

If you move to static inline for edac_device_handle_{ce,ue} the
symbols vanish and this breaks the abi. That's why the split in two
patches.

Your comment to not have a __ version as a third variant of the
interface makes sense to me. But to keep ABI your patch still needs to
be split. The first patch still must contain symbols for
edac_device_handle_{ce,ue}. I am not sure if ABI compatability is
something we want to make easier here. I personally like the approach.

-Robert

Re: [PATCH v4 1/2] edac: Add an API for edac device to report for multiple errors

[Borislav Petkov]

On Tue, Oct 01, 2019 at 09:47:07AM +0000, Robert Richter wrote:
> If you move to static inline for edac_device_handle_{ce,ue} the
> symbols vanish and this breaks the abi. That's why the split in two
> patches.

ABI issues do not concern upstream. And that coming from me working at a
company who dance a lot to make ABI happy.

Also, I'm missing the reasoning why you use the ABI as an argument at
all: do you know of a particular case where people are thinking of
backporting this or this is all hypothetical.

> Your comment to not have a __ version as a third variant of the
> interface makes sense to me. But to keep ABI your patch still needs to
> be split.

Not really - normally, when you fix ABI issues with symbols
disappearing, all of a sudden, you add dummy ones so that the ABI
checker is happy.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette

Re: [PATCH v4 1/2] edac: Add an API for edac device to report for multiple errors

[Robert Richter]

On 01.10.19 12:25:39, Borislav Petkov wrote:
> On Tue, Oct 01, 2019 at 09:47:07AM +0000, Robert Richter wrote:
> > If you move to static inline for edac_device_handle_{ce,ue} the
> > symbols vanish and this breaks the abi. That's why the split in two
> > patches.
> 
> ABI issues do not concern upstream. And that coming from me working at a
> company who dance a lot to make ABI happy.
> 
> Also, I'm missing the reasoning why you use the ABI as an argument at
> all: do you know of a particular case where people are thinking of
> backporting this or this is all hypothetical.
> 
> > Your comment to not have a __ version as a third variant of the
> > interface makes sense to me. But to keep ABI your patch still needs to
> > be split.
> 
> Not really - normally, when you fix ABI issues with symbols
> disappearing, all of a sudden, you add dummy ones so that the ABI
> checker is happy.

Let's go with a single patch then and the function naming you
suggested before.

Thanks,

-Robert

Re: [PATCH v4 1/2] edac: Add an API for edac device to report for multiple errors

[Hawa, Hanna]

On 9/30/2019 5:50 PM, Borislav Petkov wrote:
> On Mon, Sep 23, 2019 at 08:17:40PM +0100, Hanna Hawa wrote:
>> +void edac_device_handle_ce(struct edac_device_ctl_info *edac_dev,
>> +			int inst_nr, int block_nr, const char *msg)
>> +{
>> +	__edac_device_handle_ce(edac_dev, 1, inst_nr, block_nr, msg);
>> +}
>> +EXPORT_SYMBOL_GPL(edac_device_handle_ce);
> 
> Eww, I don't like that: exporting the function *and* the __ counterpart.
> The user will get confused and that is unnecessary.
> 
> See below for a better version. This way you solve the whole deal with a
> single patch.
I'm okay with this version, minor comment below.

> 
> ---
> From: Hanna Hawa <hhhawa@amazon.com>
> Date: Mon, 23 Sep 2019 20:17:40 +0100
> Subject: [PATCH] EDAC/device: Rework error logging API
> 
> Make the main workhorse the "count" functions which can log a @count
> of errors. Have the current APIs edac_device_handle_{ce,ue}() call
> the _count() variants and this way keep the exported symbols number
> unchanged.
> 
>   [ bp: Rewrite. ]
> 
> Signed-off-by: Hanna Hawa <hhhawa@amazon.com>
> Signed-off-by: Borislav Petkov <bp@suse.de>
> Cc: benh@amazon.com
> Cc: dwmw@amazon.co.uk
> Cc: hanochu@amazon.com
> Cc: James Morse <james.morse@arm.com>
> Cc: jonnyc@amazon.com
> Cc: linux-edac <linux-edac@vger.kernel.org>
> Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
> Cc: ronenk@amazon.com
> Cc: talel@amazon.com
> Cc: Tony Luck <tony.luck@intel.com>
> Link: https://lkml.kernel.org/r/20190923191741.29322-2-hhhawa@amazon.com
> ---
>   drivers/edac/edac_device.c | 44 ++++++++++++++++---------------
>   drivers/edac/edac_device.h | 54 ++++++++++++++++++++++++++++++--------
>   2 files changed, 66 insertions(+), 32 deletions(-)
> 
> diff --git a/drivers/edac/edac_device.c b/drivers/edac/edac_device.c
> index 65cf2b9355c4..d4d8bed5b55d 100644
> --- a/drivers/edac/edac_device.c
> +++ b/drivers/edac/edac_device.c
> @@ -555,8 +555,9 @@ static inline int edac_device_get_panic_on_ue(struct edac_device_ctl_info
>   	return edac_dev->panic_on_ue;
>   }
>   
> -void edac_device_handle_ce(struct edac_device_ctl_info *edac_dev,
> -			int inst_nr, int block_nr, const char *msg)
> +void edac_device_handle_ce_count(struct edac_device_ctl_info *edac_dev,
> +				 unsigned int count, int inst_nr, int block_nr,
> +				 const char *msg)
>   {
>   	struct edac_device_instance *instance;
>   	struct edac_device_block *block = NULL;

Missing count check, same in *_ue_count():
if (count)
	return;

> @@ -582,23 +583,24 @@ void edac_device_handle_ce(struct edac_device_ctl_info *edac_dev,
>   
>   	if (instance->nr_blocks > 0) {
>   		block = instance->blocks + block_nr;
> -		block->counters.ce_count++;
> +		block->counters.ce_count += count;
>   	}
>   
>   	/* Propagate the count up the 'totals' tree */
> -	instance->counters.ce_count++;
> -	edac_dev->counters.ce_count++;
> +	instance->counters.ce_count += count;
> +	edac_dev->counters.ce_count += count;
>   
>   	if (edac_device_get_log_ce(edac_dev))
>   		edac_device_printk(edac_dev, KERN_WARNING,
> -				"CE: %s instance: %s block: %s '%s'\n",
> -				edac_dev->ctl_name, instance->name,
> -				block ? block->name : "N/A", msg);
> +				   "CE: %s instance: %s block: %s count: %d '%s'\n",
> +				   edac_dev->ctl_name, instance->name,
> +				   block ? block->name : "N/A", count, msg);
>   }
> -EXPORT_SYMBOL_GPL(edac_device_handle_ce);
> +EXPORT_SYMBOL_GPL(edac_device_handle_ce_count);
>   
> -void edac_device_handle_ue(struct edac_device_ctl_info *edac_dev,
> -			int inst_nr, int block_nr, const char *msg)
> +void edac_device_handle_ue_count(struct edac_device_ctl_info *edac_dev,
> +				 unsigned int count, int inst_nr, int block_nr,
> +				 const char *msg)
>   {
>   	struct edac_device_instance *instance;
>   	struct edac_device_block *block = NULL;
> @@ -624,22 +626,22 @@ void edac_device_handle_ue(struct edac_device_ctl_info *edac_dev,
>   
>   	if (instance->nr_blocks > 0) {
>   		block = instance->blocks + block_nr;
> -		block->counters.ue_count++;
> +		block->counters.ue_count += count;
>   	}
>   
>   	/* Propagate the count up the 'totals' tree */
> -	instance->counters.ue_count++;
> -	edac_dev->counters.ue_count++;
> +	instance->counters.ue_count += count;
> +	edac_dev->counters.ue_count += count;
>   
>   	if (edac_device_get_log_ue(edac_dev))
>   		edac_device_printk(edac_dev, KERN_EMERG,
> -				"UE: %s instance: %s block: %s '%s'\n",
> -				edac_dev->ctl_name, instance->name,
> -				block ? block->name : "N/A", msg);
> +				   "UE: %s instance: %s block: %s count: %d '%s'\n",
> +				   edac_dev->ctl_name, instance->name,
> +				   block ? block->name : "N/A", count, msg);
>   
>   	if (edac_device_get_panic_on_ue(edac_dev))
> -		panic("EDAC %s: UE instance: %s block %s '%s'\n",
> -			edac_dev->ctl_name, instance->name,
> -			block ? block->name : "N/A", msg);
> +		panic("EDAC %s: UE instance: %s block %s count: %d '%s'\n",
> +		      edac_dev->ctl_name, instance->name,
> +		      block ? block->name : "N/A", count, msg);
>   }
> -EXPORT_SYMBOL_GPL(edac_device_handle_ue);
> +EXPORT_SYMBOL_GPL(edac_device_handle_ue_count);
> diff --git a/drivers/edac/edac_device.h b/drivers/edac/edac_device.h
> index 1aaba74ae411..c4c0e0bdce14 100644
> --- a/drivers/edac/edac_device.h
> +++ b/drivers/edac/edac_device.h
> @@ -286,27 +286,60 @@ extern int edac_device_add_device(struct edac_device_ctl_info *edac_dev);
>   extern struct edac_device_ctl_info *edac_device_del_device(struct device *dev);
>   
>   /**
> - * edac_device_handle_ue():
> - *	perform a common output and handling of an 'edac_dev' UE event
> + * Log correctable errors.
>    *
>    * @edac_dev: pointer to struct &edac_device_ctl_info
> - * @inst_nr: number of the instance where the UE error happened
> - * @block_nr: number of the block where the UE error happened
> + * @inst_nr: number of the instance where the CE error happened
> + * @count: Number of errors to log.
> + * @block_nr: number of the block where the CE error happened
> + * @msg: message to be printed
> + */
> +void edac_device_handle_ce_count(struct edac_device_ctl_info *edac_dev,
> +				 unsigned int count, int inst_nr, int block_nr,
> +				 const char *msg);
> +
> +/**
> + * Log uncorrectable errors.
> + *
> + * @edac_dev: pointer to struct &edac_device_ctl_info
> + * @inst_nr: number of the instance where the CE error happened
> + * @count: Number of errors to log.
> + * @block_nr: number of the block where the CE error happened
>    * @msg: message to be printed
>    */
> -extern void edac_device_handle_ue(struct edac_device_ctl_info *edac_dev,
> -				int inst_nr, int block_nr, const char *msg);
> +void edac_device_handle_ue_count(struct edac_device_ctl_info *edac_dev,
> +				 unsigned int count, int inst_nr, int block_nr,
> +				 const char *msg);
> +
>   /**
> - * edac_device_handle_ce():
> - *	perform a common output and handling of an 'edac_dev' CE event
> + * edac_device_handle_ce(): Log a single correctable error
>    *
>    * @edac_dev: pointer to struct &edac_device_ctl_info
>    * @inst_nr: number of the instance where the CE error happened
>    * @block_nr: number of the block where the CE error happened
>    * @msg: message to be printed
>    */
> -extern void edac_device_handle_ce(struct edac_device_ctl_info *edac_dev,
> -				int inst_nr, int block_nr, const char *msg);
> +static inline void
> +edac_device_handle_ce(struct edac_device_ctl_info *edac_dev, int inst_nr,
> +		      int block_nr, const char *msg)
> +{
> +	edac_device_handle_ce_count(edac_dev, 1, inst_nr, block_nr, msg);
> +}
> +
> +/**
> + * edac_device_handle_ue(): Log a single uncorrectable error
> + *
> + * @edac_dev: pointer to struct &edac_device_ctl_info
> + * @inst_nr: number of the instance where the UE error happened
> + * @block_nr: number of the block where the UE error happened
> + * @msg: message to be printed
> + */
> +static inline void
> +edac_device_handle_ue(struct edac_device_ctl_info *edac_dev, int inst_nr,
> +		      int block_nr, const char *msg)
> +{
> +	edac_device_handle_ue_count(edac_dev, 1, inst_nr, block_nr, msg);
> +}
>   
>   /**
>    * edac_device_alloc_index: Allocate a unique device index number
> @@ -316,5 +349,4 @@ extern void edac_device_handle_ce(struct edac_device_ctl_info *edac_dev,
>    */
>   extern int edac_device_alloc_index(void);
>   extern const char *edac_layer_name[];
> -
>   #endif
> 

[PATCH -v2] EDAC/device: Rework error logging API

[Borislav Petkov]

On Wed, Oct 02, 2019 at 12:25:55PM +0300, Hawa, Hanna wrote:
> Missing count check, same in *_ue_count():
> if (count)

I think you meant:

	if (!count)

Anyway, fixed:

---
From 0e49a27859b947d2abded91ee3558639bf8ec0bd Mon Sep 17 00:00:00 2001
From: Hanna Hawa <hhhawa@amazon.com>
Date: Mon, 23 Sep 2019 20:17:40 +0100
Subject: [PATCH] EDAC/device: Rework error logging API

Make the main workhorse the "count" functions which can log a @count
of errors. Have the current APIs edac_device_handle_{ce,ue}() call
the _count() variants and this way keep the exported symbols number
unchanged.

 [ bp: Rewrite. ]

Signed-off-by: Hanna Hawa <hhhawa@amazon.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: benh@amazon.com
Cc: dwmw@amazon.co.uk
Cc: hanochu@amazon.com
Cc: James Morse <james.morse@arm.com>
Cc: jonnyc@amazon.com
Cc: linux-edac <linux-edac@vger.kernel.org>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: ronenk@amazon.com
Cc: talel@amazon.com
Cc: Tony Luck <tony.luck@intel.com>
Link: https://lkml.kernel.org/r/20190923191741.29322-2-hhhawa@amazon.com
---
 drivers/edac/edac_device.c | 50 ++++++++++++++++++++---------------
 drivers/edac/edac_device.h | 54 ++++++++++++++++++++++++++++++--------
 2 files changed, 72 insertions(+), 32 deletions(-)

diff --git a/drivers/edac/edac_device.c b/drivers/edac/edac_device.c
index 65cf2b9355c4..8c4d947fb848 100644
--- a/drivers/edac/edac_device.c
+++ b/drivers/edac/edac_device.c
@@ -555,12 +555,16 @@ static inline int edac_device_get_panic_on_ue(struct edac_device_ctl_info
 	return edac_dev->panic_on_ue;
 }
 
-void edac_device_handle_ce(struct edac_device_ctl_info *edac_dev,
-			int inst_nr, int block_nr, const char *msg)
+void edac_device_handle_ce_count(struct edac_device_ctl_info *edac_dev,
+				 unsigned int count, int inst_nr, int block_nr,
+				 const char *msg)
 {
 	struct edac_device_instance *instance;
 	struct edac_device_block *block = NULL;
 
+	if (!count)
+		return;
+
 	if ((inst_nr >= edac_dev->nr_instances) || (inst_nr < 0)) {
 		edac_device_printk(edac_dev, KERN_ERR,
 				"INTERNAL ERROR: 'instance' out of range "
@@ -582,27 +586,31 @@ void edac_device_handle_ce(struct edac_device_ctl_info *edac_dev,
 
 	if (instance->nr_blocks > 0) {
 		block = instance->blocks + block_nr;
-		block->counters.ce_count++;
+		block->counters.ce_count += count;
 	}
 
 	/* Propagate the count up the 'totals' tree */
-	instance->counters.ce_count++;
-	edac_dev->counters.ce_count++;
+	instance->counters.ce_count += count;
+	edac_dev->counters.ce_count += count;
 
 	if (edac_device_get_log_ce(edac_dev))
 		edac_device_printk(edac_dev, KERN_WARNING,
-				"CE: %s instance: %s block: %s '%s'\n",
-				edac_dev->ctl_name, instance->name,
-				block ? block->name : "N/A", msg);
+				   "CE: %s instance: %s block: %s count: %d '%s'\n",
+				   edac_dev->ctl_name, instance->name,
+				   block ? block->name : "N/A", count, msg);
 }
-EXPORT_SYMBOL_GPL(edac_device_handle_ce);
+EXPORT_SYMBOL_GPL(edac_device_handle_ce_count);
 
-void edac_device_handle_ue(struct edac_device_ctl_info *edac_dev,
-			int inst_nr, int block_nr, const char *msg)
+void edac_device_handle_ue_count(struct edac_device_ctl_info *edac_dev,
+				 unsigned int count, int inst_nr, int block_nr,
+				 const char *msg)
 {
 	struct edac_device_instance *instance;
 	struct edac_device_block *block = NULL;
 
+	if (!count)
+		return;
+
 	if ((inst_nr >= edac_dev->nr_instances) || (inst_nr < 0)) {
 		edac_device_printk(edac_dev, KERN_ERR,
 				"INTERNAL ERROR: 'instance' out of range "
@@ -624,22 +632,22 @@ void edac_device_handle_ue(struct edac_device_ctl_info *edac_dev,
 
 	if (instance->nr_blocks > 0) {
 		block = instance->blocks + block_nr;
-		block->counters.ue_count++;
+		block->counters.ue_count += count;
 	}
 
 	/* Propagate the count up the 'totals' tree */
-	instance->counters.ue_count++;
-	edac_dev->counters.ue_count++;
+	instance->counters.ue_count += count;
+	edac_dev->counters.ue_count += count;
 
 	if (edac_device_get_log_ue(edac_dev))
 		edac_device_printk(edac_dev, KERN_EMERG,
-				"UE: %s instance: %s block: %s '%s'\n",
-				edac_dev->ctl_name, instance->name,
-				block ? block->name : "N/A", msg);
+				   "UE: %s instance: %s block: %s count: %d '%s'\n",
+				   edac_dev->ctl_name, instance->name,
+				   block ? block->name : "N/A", count, msg);
 
 	if (edac_device_get_panic_on_ue(edac_dev))
-		panic("EDAC %s: UE instance: %s block %s '%s'\n",
-			edac_dev->ctl_name, instance->name,
-			block ? block->name : "N/A", msg);
+		panic("EDAC %s: UE instance: %s block %s count: %d '%s'\n",
+		      edac_dev->ctl_name, instance->name,
+		      block ? block->name : "N/A", count, msg);
 }
-EXPORT_SYMBOL_GPL(edac_device_handle_ue);
+EXPORT_SYMBOL_GPL(edac_device_handle_ue_count);
diff --git a/drivers/edac/edac_device.h b/drivers/edac/edac_device.h
index 1aaba74ae411..c4c0e0bdce14 100644
--- a/drivers/edac/edac_device.h
+++ b/drivers/edac/edac_device.h
@@ -286,27 +286,60 @@ extern int edac_device_add_device(struct edac_device_ctl_info *edac_dev);
 extern struct edac_device_ctl_info *edac_device_del_device(struct device *dev);
 
 /**
- * edac_device_handle_ue():
- *	perform a common output and handling of an 'edac_dev' UE event
+ * Log correctable errors.
  *
  * @edac_dev: pointer to struct &edac_device_ctl_info
- * @inst_nr: number of the instance where the UE error happened
- * @block_nr: number of the block where the UE error happened
+ * @inst_nr: number of the instance where the CE error happened
+ * @count: Number of errors to log.
+ * @block_nr: number of the block where the CE error happened
+ * @msg: message to be printed
+ */
+void edac_device_handle_ce_count(struct edac_device_ctl_info *edac_dev,
+				 unsigned int count, int inst_nr, int block_nr,
+				 const char *msg);
+
+/**
+ * Log uncorrectable errors.
+ *
+ * @edac_dev: pointer to struct &edac_device_ctl_info
+ * @inst_nr: number of the instance where the CE error happened
+ * @count: Number of errors to log.
+ * @block_nr: number of the block where the CE error happened
  * @msg: message to be printed
  */
-extern void edac_device_handle_ue(struct edac_device_ctl_info *edac_dev,
-				int inst_nr, int block_nr, const char *msg);
+void edac_device_handle_ue_count(struct edac_device_ctl_info *edac_dev,
+				 unsigned int count, int inst_nr, int block_nr,
+				 const char *msg);
+
 /**
- * edac_device_handle_ce():
- *	perform a common output and handling of an 'edac_dev' CE event
+ * edac_device_handle_ce(): Log a single correctable error
  *
  * @edac_dev: pointer to struct &edac_device_ctl_info
  * @inst_nr: number of the instance where the CE error happened
  * @block_nr: number of the block where the CE error happened
  * @msg: message to be printed
  */
-extern void edac_device_handle_ce(struct edac_device_ctl_info *edac_dev,
-				int inst_nr, int block_nr, const char *msg);
+static inline void
+edac_device_handle_ce(struct edac_device_ctl_info *edac_dev, int inst_nr,
+		      int block_nr, const char *msg)
+{
+	edac_device_handle_ce_count(edac_dev, 1, inst_nr, block_nr, msg);
+}
+
+/**
+ * edac_device_handle_ue(): Log a single uncorrectable error
+ *
+ * @edac_dev: pointer to struct &edac_device_ctl_info
+ * @inst_nr: number of the instance where the UE error happened
+ * @block_nr: number of the block where the UE error happened
+ * @msg: message to be printed
+ */
+static inline void
+edac_device_handle_ue(struct edac_device_ctl_info *edac_dev, int inst_nr,
+		      int block_nr, const char *msg)
+{
+	edac_device_handle_ue_count(edac_dev, 1, inst_nr, block_nr, msg);
+}
 
 /**
  * edac_device_alloc_index: Allocate a unique device index number
@@ -316,5 +349,4 @@ extern void edac_device_handle_ce(struct edac_device_ctl_info *edac_dev,
  */
 extern int edac_device_alloc_index(void);
 extern const char *edac_layer_name[];
-
 #endif
-- 
2.21.0


-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette