[PATCH v6 0/3] EDAC: nuvoton: Add nuvoton NPCM memory controller driver

[PATCH v6 0/3] EDAC: nuvoton: Add nuvoton NPCM memory controller driver

[Medad CChien]

Support memory controller for Nuvoton NPCM SoC.

Addressed comments from:
 - Rob Herring : https://lkml.org/lkml/2022/2/25/1103
 - Krzysztof Kozlowski : https://lkml.org/lkml/2022/2/27/63
 - Rob Herring : https://lkml.org/lkml/2022/3/2/828
 - Krzysztof Kozlowski : https://lkml.org/lkml/2022/3/11/294
 - Jonathan Neuschäfer : https://lkml.org/lkml/2022/3/11/1167
 - Krzysztof Kozlowski : https://lkml.org/lkml/2022/3/11/293
 - Rob Herring : https://lkml.org/lkml/2022/3/11/575
 - Krzysztof Kozlowski : https://lkml.org/lkml/2022/3/11/305
 - Avi Fishman : https://lkml.org/lkml/2022/3/13/339
 - Krzysztof Kozlowski : https://lkml.org/lkml/2022/3/14/93
 - Krzysztof Kozlowski : https://lkml.org/lkml/2022/3/14/95
 - Krzysztof Kozlowski : https://lkml.org/lkml/2022/3/15/378
 - Boris Petkov : https://lkml.org/lkml/2022/3/17/561

Changes since version 6:
 - Fix warnings in npcm_edac.c.
 - Add information reported by kernel test robot <lkp@intel.com>.

Changes since version 5:
 - Update commit message of dt-bindings: edac: nuvoton: add NPCM memory controller.
 
Changes since version 4:
 - Update filename in nuvoton,npcm-memory-controller.yaml.
 - Add COMPILE_TEST in Kconfig.
 - Fix errors in npcm_edac.c.
 - Remove unnecessary checking after of_match_device() and of_device_get_match_data().

Changes since version 3:
 - Rename npcm-edac.yaml as nuvoton,npcm-memory-controller.yaml.
 - Drop 'EDAC' in title of nuvoton,npcm-memory-controller.yaml.
 - Update compatible in nuvoton,npcm-memory-controller.yaml.

Changes since version 2:
 - Update description and compatible in npcm-edac.yaml.
 - Remove address-cells and size-cells in npcm-edac.yaml.
 - Reorder the items of examples in npcm-edac.yaml.
 - Reorder header file in driver.

Changes since version 1:
 - Add nuvoton,npcm750-memory-controller property in NPCM devicetree.
 - Add new property in edac binding document.
 - Add new driver for nuvoton NPCM memory controller.

Medad CChien (3):
  ARM: dts: nuvoton: Add memory controller node
  dt-bindings: edac: nuvoton: add NPCM memory controller
  EDAC: nuvoton: Add NPCM memory controller driver

 .../edac/nuvoton,npcm-memory-controller.yaml  |  62 ++
 arch/arm/boot/dts/nuvoton-common-npcm7xx.dtsi |   7 +
 drivers/edac/Kconfig                          |   9 +
 drivers/edac/Makefile                         |   1 +
 drivers/edac/npcm_edac.c                      | 706 ++++++++++++++++++
 5 files changed, 785 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/edac/nuvoton,npcm-memory-controller.yaml
 create mode 100644 drivers/edac/npcm_edac.c

-- 
2.17.1

[PATCH v6 1/3] ARM: dts: nuvoton: Add memory controller node

[Medad CChien]

ECC must be configured in the BootBlock header.
Then, you can read error counts via
the EDAC kernel framework.

Signed-off-by: Medad CChien <ctcchien@nuvoton.com>
---
 arch/arm/boot/dts/nuvoton-common-npcm7xx.dtsi | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm/boot/dts/nuvoton-common-npcm7xx.dtsi b/arch/arm/boot/dts/nuvoton-common-npcm7xx.dtsi
index 3696980a3da1..ba542b26941e 100644
--- a/arch/arm/boot/dts/nuvoton-common-npcm7xx.dtsi
+++ b/arch/arm/boot/dts/nuvoton-common-npcm7xx.dtsi
@@ -106,6 +106,13 @@
 		interrupt-parent = <&gic>;
 		ranges;
 
+		mc: memory-controller@f0824000 {
+			compatible = "nuvoton,npcm750-memory-controller";
+			reg = <0x0 0xf0824000 0x0 0x1000>;
+			interrupts = <GIC_SPI 25 IRQ_TYPE_LEVEL_HIGH>;
+			status = "disabled";
+		};
+
 		rstc: rstc@f0801000 {
 			compatible = "nuvoton,npcm750-reset";
 			reg = <0xf0801000 0x70>;
-- 
2.17.1

Re: [PATCH v6 1/3] ARM: dts: nuvoton: Add memory controller node

[Borislav Petkov]

On Tue, Mar 22, 2022 at 11:01:50AM +0800, Medad CChien wrote:
> ECC must be configured in the BootBlock header.
> Then, you can read error counts via
> the EDAC kernel framework.
> 
> Signed-off-by: Medad CChien <ctcchien@nuvoton.com>
> ---
>  arch/arm/boot/dts/nuvoton-common-npcm7xx.dtsi | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/nuvoton-common-npcm7xx.dtsi b/arch/arm/boot/dts/nuvoton-common-npcm7xx.dtsi
> index 3696980a3da1..ba542b26941e 100644
> --- a/arch/arm/boot/dts/nuvoton-common-npcm7xx.dtsi
> +++ b/arch/arm/boot/dts/nuvoton-common-npcm7xx.dtsi
> @@ -106,6 +106,13 @@
>  		interrupt-parent = <&gic>;
>  		ranges;
>  
> +		mc: memory-controller@f0824000 {
> +			compatible = "nuvoton,npcm750-memory-controller";
> +			reg = <0x0 0xf0824000 0x0 0x1000>;
> +			interrupts = <GIC_SPI 25 IRQ_TYPE_LEVEL_HIGH>;
> +			status = "disabled";
> +		};
> +
>  		rstc: rstc@f0801000 {
>  			compatible = "nuvoton,npcm750-reset";
>  			reg = <0xf0801000 0x70>;
> --

This needs an ACK from devicetree folks.

-- 
Regards/Gruss,
    Boris.

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

Re: [PATCH v6 1/3] ARM: dts: nuvoton: Add memory controller node

[Paul Menzel]

Dear Medad,


Thank you for the patch.

Am 22.03.22 um 04:01 schrieb Medad CChien:
> ECC must be configured in the BootBlock header.

bootblock

I search for *bootblock* in Linux and the git commit messages, and does 
not seem to be a common term. Is that term used in the datasheet?

> Then, you can read error counts via
> the EDAC kernel framework.

Please reflow for 75 characters per line. (Also, there is no need to 
break lines after a sentence, unless 75 characters are reached or a new 
paragraph starts.)

Tested on what board?

> Signed-off-by: Medad CChien <ctcchien@nuvoton.com>

Out of curiosity, is the first C in CChien the letter of your middle 
name, or the last name really spelled with two capital letters in the 
beginning?

> ---
>   arch/arm/boot/dts/nuvoton-common-npcm7xx.dtsi | 7 +++++++
>   1 file changed, 7 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/nuvoton-common-npcm7xx.dtsi b/arch/arm/boot/dts/nuvoton-common-npcm7xx.dtsi
> index 3696980a3da1..ba542b26941e 100644
> --- a/arch/arm/boot/dts/nuvoton-common-npcm7xx.dtsi
> +++ b/arch/arm/boot/dts/nuvoton-common-npcm7xx.dtsi
> @@ -106,6 +106,13 @@
>   		interrupt-parent = <&gic>;
>   		ranges;
>   
> +		mc: memory-controller@f0824000 {
> +			compatible = "nuvoton,npcm750-memory-controller";
> +			reg = <0x0 0xf0824000 0x0 0x1000>;

Is f0824000 from some datasheet?

> +			interrupts = <GIC_SPI 25 IRQ_TYPE_LEVEL_HIGH>;
> +			status = "disabled";
> +		};
> +
>   		rstc: rstc@f0801000 {
>   			compatible = "nuvoton,npcm750-reset";
>   			reg = <0xf0801000 0x70>;


Kind regards,

Paul

Re: [PATCH v6 1/3] ARM: dts: nuvoton: Add memory controller node

[Medad Young]

Dear Paul,

thanks for your comments

Paul Menzel <pmenzel@molgen.mpg.de> 於 2022年4月9日 週六 下午1:57寫道：
>
> Dear Medad,
>
>
> Thank you for the patch.
>
> Am 22.03.22 um 04:01 schrieb Medad CChien:
> > ECC must be configured in the BootBlock header.
>
> bootblock
>
> I search for *bootblock* in Linux and the git commit messages, and does
> not seem to be a common term. Is that term used in the datasheet?

Yes, bootblock is a bootloader of our SOC

>
> > Then, you can read error counts via
> > the EDAC kernel framework.
>
> Please reflow for 75 characters per line. (Also, there is no need to
> break lines after a sentence, unless 75 characters are reached or a new
> paragraph starts.)
>
> Tested on what board?

I tested this on Nuvoton's BMC board

>
> > Signed-off-by: Medad CChien <ctcchien@nuvoton.com>
>
> Out of curiosity, is the first C in CChien the letter of your middle
> name, or the last name really spelled with two capital letters in the
> beginning?

this is a special last name in chinese.
my last name does really spell with two capitak letters in the begining.

>
> > ---
> >   arch/arm/boot/dts/nuvoton-common-npcm7xx.dtsi | 7 +++++++
> >   1 file changed, 7 insertions(+)
> >
> > diff --git a/arch/arm/boot/dts/nuvoton-common-npcm7xx.dtsi b/arch/arm/boot/dts/nuvoton-common-npcm7xx.dtsi
> > index 3696980a3da1..ba542b26941e 100644
> > --- a/arch/arm/boot/dts/nuvoton-common-npcm7xx.dtsi
> > +++ b/arch/arm/boot/dts/nuvoton-common-npcm7xx.dtsi
> > @@ -106,6 +106,13 @@
> >               interrupt-parent = <&gic>;
> >               ranges;
> >
> > +             mc: memory-controller@f0824000 {
> > +                     compatible = "nuvoton,npcm750-memory-controller";
> > +                     reg = <0x0 0xf0824000 0x0 0x1000>;
>
> Is f0824000 from some datasheet?
>
> > +                     interrupts = <GIC_SPI 25 IRQ_TYPE_LEVEL_HIGH>;
> > +                     status = "disabled";
> > +             };
> > +
> >               rstc: rstc@f0801000 {
> >                       compatible = "nuvoton,npcm750-reset";
> >                       reg = <0xf0801000 0x70>;
>
>
> Kind regards,
>
> Paul

B.R.
Medad

Re: [PATCH v6 1/3] ARM: dts: nuvoton: Add memory controller node

[Paul Menzel]

Dear Medad,


Thank you for your reply.

Am 11.04.22 um 09:56 schrieb Medad Young:

[…]

> Paul Menzel 於 2022年4月9日 週六 下午1:57寫道：

>> Thank you for the patch.
>>
>> Am 22.03.22 um 04:01 schrieb Medad CChien:
>>> ECC must be configured in the BootBlock header.
>>
>> bootblock
>>
>> I search for *bootblock* in Linux and the git commit messages, and does
>> not seem to be a common term. Is that term used in the datasheet?
> 
> Yes, bootblock is a bootloader of our SOC

Nice. Never heard of it before. Maybe add the project URL as reference 
for the ignorant like me.

>>> Then, you can read error counts via
>>> the EDAC kernel framework.
>>
>> Please reflow for 75 characters per line. (Also, there is no need to
>> break lines after a sentence, unless 75 characters are reached or a new
>> paragraph starts.)
>>
>> Tested on what board?
> 
> I tested this on Nuvoton's BMC board

It would be nice to have that with the model number documented in the 
commit message.

>>> Signed-off-by: Medad CChien <ctcchien@nuvoton.com>
>>
>> Out of curiosity, is the first C in CChien the letter of your middle
>> name, or the last name really spelled with two capital letters in the
>> beginning?
> 
> this is a special last name in chinese.
> my last name does really spell with two capital letters in the beginning.

Interesting. Thank you for teaching me new things.


Kind regards,

Paul

[PATCH v6 2/3] dt-bindings: edac: nuvoton: add NPCM memory controller

[Medad CChien]

Added device tree binding documentation for Nuvoton BMC
NPCM memory controller.

Signed-off-by: Medad CChien <ctcchien@nuvoton.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
---
 .../edac/nuvoton,npcm-memory-controller.yaml  | 62 +++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/edac/nuvoton,npcm-memory-controller.yaml

diff --git a/Documentation/devicetree/bindings/edac/nuvoton,npcm-memory-controller.yaml b/Documentation/devicetree/bindings/edac/nuvoton,npcm-memory-controller.yaml
new file mode 100644
index 000000000000..97469294f4ba
--- /dev/null
+++ b/Documentation/devicetree/bindings/edac/nuvoton,npcm-memory-controller.yaml
@@ -0,0 +1,62 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/edac/nuvoton,npcm-memory-controller.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Nuvoton NPCM Memory Controller
+
+maintainers:
+  - Medad CChien <ctcchien@nuvoton.com>
+
+description: |
+  The Nuvoton BMC SoC supports DDR4 memory with and without ECC (error
+  correction check).
+
+  The memory controller supports single bit error correction, double bit
+  error detection (in-line ECC in which a section (1/8th) of the
+  memory device used to store data is used for ECC storage).
+
+  Note, the bootloader must configure ECC mode for the memory controller.
+
+properties:
+  compatible:
+    enum:
+      - nuvoton,npcm845-memory-controller
+      - nuvoton,npcm750-memory-controller
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    minItems: 1
+    items:
+      - description: uncorrectable error interrupt
+      - description: correctable error interrupt
+
+  interrupt-names:
+    minItems: 1
+    items:
+      - const: ue
+      - const: ce
+
+required:
+  - compatible
+  - reg
+  - interrupts
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    ahb {
+        #address-cells = <2>;
+        #size-cells = <2>;
+        mc: memory-controller@f0824000 {
+            compatible = "nuvoton,npcm750-memory-controller";
+            reg = <0x0 0xf0824000 0x0 0x1000>;
+            interrupts = <GIC_SPI 25 IRQ_TYPE_LEVEL_HIGH>;
+        };
+    };
+
-- 
2.17.1

Re: [PATCH v6 2/3] dt-bindings: edac: nuvoton: add NPCM memory controller

[Rob Herring]

On Tue, 22 Mar 2022 11:01:51 +0800, Medad CChien wrote:
> Added device tree binding documentation for Nuvoton BMC
> NPCM memory controller.
> 
> Signed-off-by: Medad CChien <ctcchien@nuvoton.com>
> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
> ---
>  .../edac/nuvoton,npcm-memory-controller.yaml  | 62 +++++++++++++++++++
>  1 file changed, 62 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/edac/nuvoton,npcm-memory-controller.yaml
> 

Acked-by: Rob Herring <robh@kernel.org>

Re: [PATCH v6 2/3] dt-bindings: edac: nuvoton: add NPCM memory controller

[Borislav Petkov]

On Tue, Mar 22, 2022 at 11:01:51AM +0800, Medad CChien wrote:
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    ahb {
> +        #address-cells = <2>;
> +        #size-cells = <2>;
> +        mc: memory-controller@f0824000 {
> +            compatible = "nuvoton,npcm750-memory-controller";
> +            reg = <0x0 0xf0824000 0x0 0x1000>;
> +            interrupts = <GIC_SPI 25 IRQ_TYPE_LEVEL_HIGH>;
> +        };
> +    };
> +

.git/rebase-apply/patch:73: new blank line at EOF.
+
warning: 1 line adds whitespace errors.


-- 
Regards/Gruss,
    Boris.

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

Re: [PATCH v6 2/3] dt-bindings: edac: nuvoton: add NPCM memory controller

[Medad Young]

Dear Borislav,

thanks for your comment
I will revise it

B.R.
Medad

Borislav Petkov <bp@alien8.de> 於 2022年4月9日 週六 上午1:05寫道：
>
> On Tue, Mar 22, 2022 at 11:01:51AM +0800, Medad CChien wrote:
> > +examples:
> > +  - |
> > +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> > +    ahb {
> > +        #address-cells = <2>;
> > +        #size-cells = <2>;
> > +        mc: memory-controller@f0824000 {
> > +            compatible = "nuvoton,npcm750-memory-controller";
> > +            reg = <0x0 0xf0824000 0x0 0x1000>;
> > +            interrupts = <GIC_SPI 25 IRQ_TYPE_LEVEL_HIGH>;
> > +        };
> > +    };
> > +
>
> .git/rebase-apply/patch:73: new blank line at EOF.
> +
> warning: 1 line adds whitespace errors.
>
>
> --
> Regards/Gruss,
>     Boris.
>
> https://people.kernel.org/tglx/notes-about-netiquette

Re: [PATCH v6 2/3] dt-bindings: edac: nuvoton: add NPCM memory controller

[Borislav Petkov]

On Mon, Apr 11, 2022 at 03:57:48PM +0800, Medad Young wrote:
> Dear Borislav,
> 
> thanks for your comment
> I will revise it

Thanks.

For the future, please avoid top-posting but put your reply underneath
the text you're replying to, like everyone else.

Thx.

-- 
Regards/Gruss,
    Boris.

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

Re: [PATCH v6 2/3] dt-bindings: edac: nuvoton: add NPCM memory controller

[Paul Menzel]

Dear Medad,


Thank you for your patch.

Am 22.03.22 um 04:01 schrieb Medad CChien:
> Added device tree binding documentation for Nuvoton BMC
> NPCM memory controller.

Please use present tense, and spell *devicetree* without a space. The 
line below even fits in 75 characters:

Document devicetree bindings for the Nuvoton BMC NPCM memory controller.

> Signed-off-by: Medad CChien <ctcchien@nuvoton.com>
> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
> ---
>   .../edac/nuvoton,npcm-memory-controller.yaml  | 62 +++++++++++++++++++
>   1 file changed, 62 insertions(+)
>   create mode 100644 Documentation/devicetree/bindings/edac/nuvoton,npcm-memory-controller.yaml
> 
> diff --git a/Documentation/devicetree/bindings/edac/nuvoton,npcm-memory-controller.yaml b/Documentation/devicetree/bindings/edac/nuvoton,npcm-memory-controller.yaml
> new file mode 100644
> index 000000000000..97469294f4ba
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/edac/nuvoton,npcm-memory-controller.yaml
> @@ -0,0 +1,62 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/edac/nuvoton,npcm-memory-controller.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Nuvoton NPCM Memory Controller
> +
> +maintainers:
> +  - Medad CChien <ctcchien@nuvoton.com>
> +
> +description: |
> +  The Nuvoton BMC SoC supports DDR4 memory with and without ECC (error
> +  correction check).
> +
> +  The memory controller supports single bit error correction, double bit
> +  error detection (in-line ECC in which a section (1/8th) of the
> +  memory device used to store data is used for ECC storage).

*memory* fits on the line above?

> +
> +  Note, the bootloader must configure ECC mode for the memory controller.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - nuvoton,npcm845-memory-controller
> +      - nuvoton,npcm750-memory-controller

Sort the entries?


Kind regards,

Paul


> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    minItems: 1
> +    items:
> +      - description: uncorrectable error interrupt
> +      - description: correctable error interrupt
> +
> +  interrupt-names:
> +    minItems: 1
> +    items:
> +      - const: ue
> +      - const: ce
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    ahb {
> +        #address-cells = <2>;
> +        #size-cells = <2>;
> +        mc: memory-controller@f0824000 {
> +            compatible = "nuvoton,npcm750-memory-controller";
> +            reg = <0x0 0xf0824000 0x0 0x1000>;
> +            interrupts = <GIC_SPI 25 IRQ_TYPE_LEVEL_HIGH>;
> +        };
> +    };
> +

Re: [PATCH v6 2/3] dt-bindings: edac: nuvoton: add NPCM memory controller

[Medad Young]

Dear Paul,

thanks for your comments

Paul Menzel <pmenzel@molgen.mpg.de> 於 2022年4月9日 週六 下午2:12寫道：
>
> Dear Medad,
>
>
> Thank you for your patch.
>
> Am 22.03.22 um 04:01 schrieb Medad CChien:
> > Added device tree binding documentation for Nuvoton BMC
> > NPCM memory controller.
>
> Please use present tense, and spell *devicetree* without a space. The
> line below even fits in 75 characters:
>
> Document devicetree bindings for the Nuvoton BMC NPCM memory controller.

OK


>
> > Signed-off-by: Medad CChien <ctcchien@nuvoton.com>
> > Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
> > ---
> >   .../edac/nuvoton,npcm-memory-controller.yaml  | 62 +++++++++++++++++++
> >   1 file changed, 62 insertions(+)
> >   create mode 100644 Documentation/devicetree/bindings/edac/nuvoton,npcm-memory-controller.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/edac/nuvoton,npcm-memory-controller.yaml b/Documentation/devicetree/bindings/edac/nuvoton,npcm-memory-controller.yaml
> > new file mode 100644
> > index 000000000000..97469294f4ba
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/edac/nuvoton,npcm-memory-controller.yaml
> > @@ -0,0 +1,62 @@
> > +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/edac/nuvoton,npcm-memory-controller.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Nuvoton NPCM Memory Controller
> > +
> > +maintainers:
> > +  - Medad CChien <ctcchien@nuvoton.com>
> > +
> > +description: |
> > +  The Nuvoton BMC SoC supports DDR4 memory with and without ECC (error
> > +  correction check).
> > +
> > +  The memory controller supports single bit error correction, double bit
> > +  error detection (in-line ECC in which a section (1/8th) of the
> > +  memory device used to store data is used for ECC storage).
>
> *memory* fits on the line above?

do you mean I should change the term "memory" to others?

>
> > +
> > +  Note, the bootloader must configure ECC mode for the memory controller.
> > +
> > +properties:
> > +  compatible:
> > +    enum:
> > +      - nuvoton,npcm845-memory-controller
> > +      - nuvoton,npcm750-memory-controller
>
> Sort the entries?

OK

>
>
> Kind regards,
>
> Paul
>
>
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  interrupts:
> > +    minItems: 1
> > +    items:
> > +      - description: uncorrectable error interrupt
> > +      - description: correctable error interrupt
> > +
> > +  interrupt-names:
> > +    minItems: 1
> > +    items:
> > +      - const: ue
> > +      - const: ce
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - interrupts
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> > +    ahb {
> > +        #address-cells = <2>;
> > +        #size-cells = <2>;
> > +        mc: memory-controller@f0824000 {
> > +            compatible = "nuvoton,npcm750-memory-controller";
> > +            reg = <0x0 0xf0824000 0x0 0x1000>;
> > +            interrupts = <GIC_SPI 25 IRQ_TYPE_LEVEL_HIGH>;
> > +        };
> > +    };
> > +

[PATCH v6 3/3] EDAC: nuvoton: Add NPCM memory controller driver

[Medad CChien]

Add support for Nuvoton NPCM SoC.

Signed-off-by: Medad CChien <ctcchien@nuvoton.com>

Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   drivers/edac/npcm_edac.c: In function 'forced_ecc_error_store':
   drivers/edac/npcm_edac.c:370:13: warning: suggest parentheses around operand of '!' or change '&' to '&&' or '!' to '~' [-Wparentheses]
     370 |         if (!readl(priv->reg + npcm_chip->ecc_ctl_en_reg) & npcm_chip->ecc_ctl_ecc_enable_mask)
>> drivers/edac/npcm_edac.c:386:92: error: macro "edac_printk" requires 4 arguments, but only 2 given
     386 |                                 edac_printk(KERN_INFO, "bit_no for checkcode must be 0~7\n");
         |                                                                                            ^
   In file included from drivers/edac/edac_module.h:14,
                    from drivers/edac/npcm_edac.c:15:
   drivers/edac/edac_mc.h:48: note: macro "edac_printk" defined here
      48 | #define edac_printk(level, prefix, fmt, arg...) \
         |
>> drivers/edac/npcm_edac.c:386:33: error: 'edac_printk' undeclared (first use in this function); did you mean '_dev_printk'?
     386 |                                 edac_printk(KERN_INFO, "bit_no for checkcode must be 0~7\n");
         |                                 ^~~~~~~~~~~
         |                                 _dev_printk
   drivers/edac/npcm_edac.c:386:33: note: each undeclared identifier is reported only once for each function it appears in
   drivers/edac/npcm_edac.c:395:88: error: macro "edac_printk" requires 4 arguments, but only 2 given
     395 |                                 edac_printk(KERN_INFO, "bit_no for data must be 0~63\n");
         |                                                                                        ^
   In file included from drivers/edac/edac_module.h:14,
                    from drivers/edac/npcm_edac.c:15:
   drivers/edac/edac_mc.h:48: note: macro "edac_printk" defined here
      48 | #define edac_printk(level, prefix, fmt, arg...) \
         |
   drivers/edac/npcm_edac.c: In function 'npcm_edac_mc_probe':
   drivers/edac/npcm_edac.c:583:9: warning: ISO C90 forbids mixed declarations and code [-Wdeclaration-after-statement]
     583 |         u32 ecc_en = readl(reg + npcm_chip->ecc_ctl_en_reg);
         |         ^~~

All warnings (new ones prefixed by >>):

   In file included from drivers/edac/npcm_edac.c:8:
   In file included from include/linux/interrupt.h:11:
   In file included from include/linux/hardirq.h:11:
   In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
   In file included from include/asm-generic/hardirq.h:17:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/riscv/include/asm/io.h:136:
   include/asm-generic/io.h:464:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __raw_readb(PCI_IOBASE + addr);
                             ~~~~~~~~~~ ^
   include/asm-generic/io.h:477:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
                                                           ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu'
   #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
                                                     ^
   In file included from drivers/edac/npcm_edac.c:8:
   In file included from include/linux/interrupt.h:11:
   In file included from include/linux/hardirq.h:11:
   In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
   In file included from include/asm-generic/hardirq.h:17:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/riscv/include/asm/io.h:136:
   include/asm-generic/io.h:490:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
                                                           ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu'
   #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
                                                     ^
   In file included from drivers/edac/npcm_edac.c:8:
   In file included from include/linux/interrupt.h:11:
   In file included from include/linux/hardirq.h:11:
   In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
   In file included from include/asm-generic/hardirq.h:17:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/riscv/include/asm/io.h:136:
   include/asm-generic/io.h:501:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writeb(value, PCI_IOBASE + addr);
                               ~~~~~~~~~~ ^
   include/asm-generic/io.h:511:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
                                                         ~~~~~~~~~~ ^
   include/asm-generic/io.h:521:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
                                                         ~~~~~~~~~~ ^
   include/asm-generic/io.h:1024:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port;
                                                     ~~~~~~~~~~ ^
>> drivers/edac/npcm_edac.c:370:6: warning: logical not is only applied to the left hand side of this bitwise operator [-Wlogical-not-parentheses]
           if (!readl(priv->reg + npcm_chip->ecc_ctl_en_reg) & npcm_chip->ecc_ctl_ecc_enable_mask)
               ^                                             ~
   drivers/edac/npcm_edac.c:370:6: note: add parentheses after the '!' to evaluate the bitwise operator first
           if (!readl(priv->reg + npcm_chip->ecc_ctl_en_reg) & npcm_chip->ecc_ctl_ecc_enable_mask)
               ^
                (                                                                                )
   drivers/edac/npcm_edac.c:370:6: note: add parentheses around left hand side expression to silence this warning
           if (!readl(priv->reg + npcm_chip->ecc_ctl_en_reg) & npcm_chip->ecc_ctl_ecc_enable_mask)
               ^
               (                                            )
>> drivers/edac/npcm_edac.c:579:6: warning: mixing declarations and code is a C99 extension [-Wdeclaration-after-statement]
           u32 ecc_en = readl(reg + npcm_chip->ecc_ctl_en_reg);
               ^
   9 warnings generated.
---
 drivers/edac/Kconfig     |   9 +
 drivers/edac/Makefile    |   1 +
 drivers/edac/npcm_edac.c | 706 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 716 insertions(+)
 create mode 100644 drivers/edac/npcm_edac.c

diff --git a/drivers/edac/Kconfig b/drivers/edac/Kconfig
index 58ab63642e72..bdca55fa6022 100644
--- a/drivers/edac/Kconfig
+++ b/drivers/edac/Kconfig
@@ -539,4 +539,13 @@ config EDAC_DMC520
 	  Support for error detection and correction on the
 	  SoCs with ARM DMC-520 DRAM controller.
 
+config EDAC_NPCM
+	tristate "Nuvoton NPCM DDR Memory Controller"
+	depends on (ARCH_NPCM || COMPILE_TEST)
+	help
+	  Support for error detection and correction on the
+	  Nuvoton NPCM DDR memory controller.
+	  First, ECC must be configured in the BootBlock header. Then, this driver
+	  will expose error counters via the EDAC kernel framework.
+
 endif # EDAC
diff --git a/drivers/edac/Makefile b/drivers/edac/Makefile
index 2d1641a27a28..db3c59d3ad84 100644
--- a/drivers/edac/Makefile
+++ b/drivers/edac/Makefile
@@ -84,3 +84,4 @@ obj-$(CONFIG_EDAC_QCOM)			+= qcom_edac.o
 obj-$(CONFIG_EDAC_ASPEED)		+= aspeed_edac.o
 obj-$(CONFIG_EDAC_BLUEFIELD)		+= bluefield_edac.o
 obj-$(CONFIG_EDAC_DMC520)		+= dmc520_edac.o
+obj-$(CONFIG_EDAC_NPCM)			+= npcm_edac.o
diff --git a/drivers/edac/npcm_edac.c b/drivers/edac/npcm_edac.c
new file mode 100644
index 000000000000..9dd05bec0b7f
--- /dev/null
+++ b/drivers/edac/npcm_edac.c
@@ -0,0 +1,706 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2022 Nuvoton Technology corporation.
+
+#include <linux/delay.h>
+#include <linux/of_device.h>
+
+#include "edac_module.h"
+
+#define NPCM_EDAC_MOD_NAME "npcm-edac"
+#define FORCED_ECC_ERR_EVENT_SUPPORT	BIT(1)
+#define EDAC_MSG_SIZE                  256
+/* Granularity of reported error in bytes */
+#define NPCM_EDAC_ERR_GRAIN		1
+
+#define MEM_TYPE_DDR4			0xA
+
+#define NPCM8XX_CHIP			0x800
+#define NPCM7XX_CHIP			0x700
+
+/* Control register width definitions */
+#define WDTH_16				(2)
+#define WDTH_32				(1)
+#define WDTH_64				(0)
+#define CTL_MEM_MAX_WIDTH_MASK		GENMASK(4, 0)
+#define CTL_REG_WIDTH_SHIFT		(32)
+#define XOR_CHECK_BIT_SPLIT_WIDTH		(16)
+#define CTL_CONTROLLER_BUSY_FLAG	BIT(0)
+#define NPCM_ECC_CTL_FORCE_WC		BIT(8)
+#define NPCM_ECC_CTL_AUTO_WRITEBACK_EN	BIT(24)
+#define NPCM_ECC_CTL_XOR_BITS_MASK		GENMASK(23, 16)
+#define NPCM_ECC_CTL_MTYPE_MASK			GENMASK(11, 8)
+#define NPCM_ECC_CTL_GLOBAL_INT_DISABLE	BIT(31)
+
+#ifdef CONFIG_EDAC_DEBUG
+
+/* Syndrome values */
+#define ECC_DOUBLE_MULTI_ERR_SYND	0x03
+
+static char data_synd[] = {
+			0xf4, 0xf1, 0xec, 0xea, 0xe9, 0xe6, 0xe5, 0xe3,
+			0xdc, 0xda, 0xd9, 0xd6, 0xd5, 0xd3, 0xce, 0xcb,
+			0xb5, 0xb0, 0xad, 0xab, 0xa8, 0xa7, 0xa4, 0xa2,
+			0x9d, 0x9b, 0x98, 0x97, 0x94, 0x92, 0x8f, 0x8a,
+			0x75, 0x70, 0x6d, 0x6b, 0x68, 0x67, 0x64, 0x62,
+			0x5e, 0x5b, 0x58, 0x57, 0x54, 0x52, 0x4f, 0x4a,
+			0x34, 0x31, 0x2c, 0x2a, 0x29, 0x26, 0x25, 0x23,
+			0x1c, 0x1a, 0x19, 0x16, 0x15, 0x13, 0x0e, 0x0b
+		  };
+
+static char check_synd[] = {0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80};
+#endif
+
+struct npcm_edac_platform_data {
+	/* force ECC event */
+	u32 ip_features;
+	u32 ddr_ctl_controller_busy_reg;
+	u32 ecc_ctl_xor_check_bits_reg;
+
+	u32 chip;
+
+	/* DDR4 Controller Registers */
+	u32 ddr_ctl_mem_type_reg;
+	u32 ddr_ctl_mem_width_reg;
+
+	u32 ecc_ctl_en_reg;
+	u32 ecc_ctl_int_mask;
+	u32 ecc_ctl_int_status;
+	u32 ecc_ctl_int_ack;
+	u32 ecc_ctl_int_mask_master;
+	u32 ecc_ctl_int_mask_ecc;
+
+	u32 ecc_sig_ecc_c_addr_l;
+	u32 ecc_sig_ecc_c_addr_h;
+	u32 ecc_sig_ecc_c_data_l;
+	u32 ecc_sig_ecc_c_data_h;
+	u32 ecc_sig_ecc_c_id;
+	u32 ecc_sig_ecc_c_synd;
+
+	u32 ecc_sig_ecc_u_addr_l;
+	u32 ecc_sig_ecc_u_addr_h;
+	u32 ecc_sig_ecc_u_data_l;
+	u32 ecc_sig_ecc_u_data_h;
+	u32 ecc_sig_ecc_u_id;
+	u32 ecc_sig_ecc_u_synd;
+
+	/* MASK */
+	u32 ecc_ctl_ecc_enable_mask;
+	u32 ecc_ctl_en_int_master_mask;
+	u32 ecc_ctl_en_int_ecc_mask;
+
+	/* ECC IRQ Macros */
+	u32 ecc_int_ce_event;
+	u32 ecc_int_second_ce_event;
+	u32 ecc_int_ue_event;
+	u32 ecc_int_second_ue_event;
+	u32 ecc_int_ce_ue_mask;
+	u32 ecc_ce_intr_mask;
+	u32 ecc_ue_intr_mask;
+
+	/* ECC Signature Macros */
+	u32 ecc_sig_ecc_c_id_shift;
+	u32 ecc_sig_ecc_c_synd_shift;
+	u32 ecc_sig_ecc_c_addr_h_mask;
+	u32 ecc_sig_ecc_c_id_mask;
+	u32 ecc_sig_ecc_c_synd_mask;
+
+	u32 ecc_sig_ecc_u_id_shift;
+	u32 ecc_sig_ecc_u_synd_shift;
+	u32 ecc_sig_ecc_u_addr_h_mask;
+	u32 ecc_sig_ecc_u_id_mask;
+	u32 ecc_sig_ecc_u_synd_mask;
+};
+
+struct priv_data {
+	void __iomem *reg;
+	u32 ce_cnt;
+	u32 ue_cnt;
+	char message[EDAC_MSG_SIZE];
+	const struct npcm_edac_platform_data *npcm_chip;
+};
+
+#ifdef CONFIG_EDAC_DEBUG
+static void init_mem_layout(struct mem_ctl_info *mci)
+{
+	struct priv_data *priv = mci->pvt_info;
+	const struct npcm_edac_platform_data *npcm_chip = priv->npcm_chip;
+	struct csrow_info *csi;
+	struct dimm_info *dimm;
+	struct sysinfo inf;
+	enum mem_type mtype;
+	u32 val, width;
+	u32 size, row;
+	u8 j;
+
+	dimm = edac_get_dimm(mci, 0, 0, 0);
+	if (!dimm) {
+		si_meminfo(&inf);
+		for (row = 0; row < mci->nr_csrows; row++) {
+			csi = mci->csrows[row];
+			size = inf.totalram * inf.mem_unit;
+
+			for (j = 0; j < csi->nr_channels; j++) {
+				dimm            = csi->channels[j]->dimm;
+				dimm->edac_mode = EDAC_FLAG_SECDED;
+				/* Get memory type by reading hw registers*/
+				val = readl(priv->reg + npcm_chip->ddr_ctl_mem_type_reg);
+				mtype = val & NPCM_ECC_CTL_MTYPE_MASK;
+
+				if (mtype == MEM_TYPE_DDR4)
+					dimm->mtype = MEM_DDR4;
+				else
+					dimm->mtype = MEM_EMPTY;
+
+				/*Get EDAC devtype width for the current mc*/
+				width = readl(priv->reg + npcm_chip->ddr_ctl_mem_width_reg)
+					      & CTL_MEM_MAX_WIDTH_MASK;
+				switch (width) {
+				case WDTH_16:
+					dimm->dtype  = DEV_X2;
+					break;
+				case WDTH_32:
+					dimm->dtype  = DEV_X4;
+					break;
+				case WDTH_64:
+					dimm->dtype  = DEV_X8;
+					break;
+				default:
+					dimm->dtype = DEV_UNKNOWN;
+				}
+
+				dimm->nr_pages  = (size >> PAGE_SHIFT) /
+					csi->nr_channels;
+				dimm->grain     = NPCM_EDAC_ERR_GRAIN;
+			}
+		}
+	}
+}
+#endif
+
+static void handle_ce(struct mem_ctl_info *mci)
+{
+	struct priv_data *priv = mci->pvt_info;
+	const struct npcm_edac_platform_data *npcm_chip = priv->npcm_chip;
+	u64 err_c_addr = 0x0;
+	u64 err_c_data = 0x0;
+	u32 err_c_synd, err_c_id;
+	u32 sig_val_l, sig_val_h;
+
+	sig_val_l = readl(priv->reg + npcm_chip->ecc_sig_ecc_c_addr_l);
+
+	if (npcm_chip->chip == NPCM8XX_CHIP)
+		sig_val_h = (readl(priv->reg + npcm_chip->ecc_sig_ecc_c_addr_h) &
+				npcm_chip->ecc_sig_ecc_c_addr_h_mask);
+	else
+		sig_val_h = 0x0;
+
+	err_c_addr = (((err_c_addr | sig_val_h) <<
+				CTL_REG_WIDTH_SHIFT) | sig_val_l);
+
+	sig_val_l = readl(priv->reg + npcm_chip->ecc_sig_ecc_c_data_l);
+
+	if (npcm_chip->chip == NPCM8XX_CHIP)
+		sig_val_h = readl(priv->reg + npcm_chip->ecc_sig_ecc_c_data_h);
+	else
+		sig_val_h = 0x0;
+
+	err_c_data = (((err_c_data | sig_val_h) <<
+				CTL_REG_WIDTH_SHIFT) | sig_val_l);
+
+	err_c_id = ((readl(priv->reg + npcm_chip->ecc_sig_ecc_c_id) &
+				npcm_chip->ecc_sig_ecc_c_id_mask) >>
+				npcm_chip->ecc_sig_ecc_c_id_shift);
+
+	err_c_synd = ((readl(priv->reg + npcm_chip->ecc_sig_ecc_c_synd) &
+				npcm_chip->ecc_sig_ecc_c_synd_mask) >>
+				npcm_chip->ecc_sig_ecc_c_synd_shift);
+
+	priv->ce_cnt = priv->ce_cnt + 1;
+
+	snprintf(priv->message,
+		 EDAC_MSG_SIZE, "DDR ECC %s: data=0x%llx source_id=%#08x",
+		 mci->ctl_name, err_c_data, err_c_id);
+
+	edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci,
+			     1,
+			     err_c_addr >> PAGE_SHIFT,
+			     err_c_addr & ~PAGE_MASK,
+			     err_c_synd, 0, 0, -1,
+			     priv->message, "");
+}
+
+static void handle_ue(struct mem_ctl_info *mci)
+{
+	struct priv_data *priv = mci->pvt_info;
+	const struct npcm_edac_platform_data *npcm_chip = priv->npcm_chip;
+	u64 err_u_addr = 0x0;
+	u64 err_u_data = 0x0;
+	u32 err_u_synd, err_u_id;
+	u32 sig_val_l, sig_val_h;
+
+	sig_val_l = readl(priv->reg + npcm_chip->ecc_sig_ecc_u_addr_l);
+
+	if (npcm_chip->chip == NPCM8XX_CHIP)
+		sig_val_h = (readl(priv->reg + npcm_chip->ecc_sig_ecc_u_addr_h) &
+				npcm_chip->ecc_sig_ecc_u_addr_h_mask);
+	else
+		sig_val_h = 0x0;
+
+	err_u_addr = (((err_u_addr | sig_val_h) <<
+				CTL_REG_WIDTH_SHIFT) | sig_val_l);
+
+	sig_val_l = readl(priv->reg + npcm_chip->ecc_sig_ecc_u_data_l);
+
+	if (npcm_chip->chip == NPCM8XX_CHIP)
+		sig_val_h = readl(priv->reg + npcm_chip->ecc_sig_ecc_u_data_h);
+	else
+		sig_val_h = 0x0;
+
+	err_u_data = (((err_u_data | sig_val_h) <<
+				CTL_REG_WIDTH_SHIFT) | sig_val_l);
+
+	err_u_id = ((readl(priv->reg + npcm_chip->ecc_sig_ecc_u_id) &
+				npcm_chip->ecc_sig_ecc_u_id_mask) >>
+			npcm_chip->ecc_sig_ecc_u_id_shift);
+
+	err_u_synd = ((readl(priv->reg + npcm_chip->ecc_sig_ecc_u_synd) &
+				npcm_chip->ecc_sig_ecc_u_synd_mask) >>
+			npcm_chip->ecc_sig_ecc_u_synd_shift);
+	priv->ue_cnt = priv->ue_cnt + 1;
+
+	snprintf(priv->message, EDAC_MSG_SIZE,
+		 "DDR ECC %s: addr=0x%llx data=0x%llx source_id=%#08x",
+		 mci->ctl_name, err_u_addr, err_u_data, err_u_id);
+
+	edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci,
+			     1,
+			     err_u_addr >> PAGE_SHIFT,
+			     err_u_addr & ~PAGE_MASK,
+			     err_u_synd, 0, 0, -1,
+			     priv->message, "");
+}
+
+static irqreturn_t edac_ecc_isr(int irq, void *dev_id)
+{
+	struct mem_ctl_info *mci = dev_id;
+	struct priv_data *priv = mci->pvt_info;
+	const struct npcm_edac_platform_data *npcm_chip = priv->npcm_chip;
+	u32 intr_status;
+	u32 val;
+
+	/* Check the intr status and confirm ECC error intr */
+	intr_status = readl(priv->reg + npcm_chip->ecc_ctl_int_status);
+
+	edac_dbg(3, "InterruptStatus : 0x%x\n", intr_status);
+	val = intr_status & npcm_chip->ecc_int_ce_ue_mask;
+	if (!((val & npcm_chip->ecc_ce_intr_mask) || (val & npcm_chip->ecc_ue_intr_mask)))
+		return IRQ_NONE;
+
+	if (val & npcm_chip->ecc_ce_intr_mask) {
+		handle_ce(mci);
+
+		/* Clear the interrupt source */
+		if (val & npcm_chip->ecc_int_ce_event)
+			writel(npcm_chip->ecc_int_ce_event, priv->reg + npcm_chip->ecc_ctl_int_ack);
+		else if (val & npcm_chip->ecc_int_second_ce_event)
+			writel(npcm_chip->ecc_int_second_ce_event,
+			       priv->reg + npcm_chip->ecc_ctl_int_ack);
+		else
+			edac_printk(KERN_ERR, NPCM_EDAC_MOD_NAME, "Failed to clear IRQ\n");
+	}
+
+	if (val & npcm_chip->ecc_ue_intr_mask) {
+		handle_ue(mci);
+
+		/* Clear the interrupt source */
+		if (val & npcm_chip->ecc_int_ue_event)
+			writel(npcm_chip->ecc_int_ue_event, priv->reg + npcm_chip->ecc_ctl_int_ack);
+		else if (val & npcm_chip->ecc_int_second_ue_event)
+			writel(npcm_chip->ecc_int_second_ue_event,
+			       priv->reg + npcm_chip->ecc_ctl_int_ack);
+		else
+			edac_printk(KERN_ERR, NPCM_EDAC_MOD_NAME, "Failed to clear IRQ\n");
+	}
+
+	edac_dbg(3, "Total error count CE %d UE %d\n",
+		 priv->ce_cnt, priv->ue_cnt);
+
+	return IRQ_HANDLED;
+}
+
+#ifdef CONFIG_EDAC_DEBUG
+
+static ssize_t forced_ecc_error_show(struct device *dev,
+				     struct device_attribute *mattr,
+				     char *data)
+{
+	return sprintf(data, "CDNS-DDR4 Force Injection Help:\n"
+		       "CE: Corrected\n"
+		       "checkcode/data:source\n"
+		       "bit [0-63] for data [0-7] for checkcode:bit number\n"
+		       "--------------------------------------------------\n"
+		       "UE: Uncorrected\n");
+}
+
+static ssize_t forced_ecc_error_store(struct device *dev,
+				      struct device_attribute *mattr,
+				      const char *data, size_t count)
+{
+	struct mem_ctl_info *mci = to_mci(dev);
+	struct priv_data *priv = mci->pvt_info;
+	const struct npcm_edac_platform_data *npcm_chip = priv->npcm_chip;
+	int	args_cnt;
+	int	ret;
+	char	**args;
+	u32	regval;
+	u8	bit_no;
+
+	/* Split string buffer into separate parameters */
+	args = argv_split(GFP_KERNEL, data, &args_cnt);
+
+	/* Check ecc enabled */
+	if (!(readl(priv->reg + npcm_chip->ecc_ctl_en_reg) & npcm_chip->ecc_ctl_ecc_enable_mask))
+		return count;
+
+	/* Check no write operation pending to controller*/
+	while (readl(priv->reg + npcm_chip->ddr_ctl_controller_busy_reg) &
+			CTL_CONTROLLER_BUSY_FLAG) {
+		usleep_range(1000, 10000);
+	}
+
+	/* Write appropriate syndrome to xor_check_bit*/
+	if (!strcmp(args[0], "CE") && args_cnt == 3) {
+		ret = kstrtou8(args[2], 0, &bit_no);
+		if (ret)
+			return ret;
+		if (!strcmp(args[1], "checkcode")) {
+			if (bit_no > 7) {
+				edac_printk(KERN_INFO, NPCM_EDAC_MOD_NAME, "bit_no for checkcode must be 0~7\n");
+				return count;
+			}
+			regval = readl(priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
+			regval = (regval & ~(NPCM_ECC_CTL_XOR_BITS_MASK)) |
+				(check_synd[bit_no] << XOR_CHECK_BIT_SPLIT_WIDTH);
+			writel(regval, priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
+		} else if (!strcmp(args[1], "data")) {
+			if (bit_no > 63) {
+				edac_printk(KERN_INFO, NPCM_EDAC_MOD_NAME, "bit_no for data must be 0~63\n");
+				return count;
+			}
+			regval = readl(priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
+			regval = (regval & ~(NPCM_ECC_CTL_XOR_BITS_MASK)) |
+					 (data_synd[bit_no] << XOR_CHECK_BIT_SPLIT_WIDTH);
+			writel(regval, priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
+		}
+		/* Enable the ECC writeback_en for corrected error */
+		regval = readl(priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
+		writel((regval | NPCM_ECC_CTL_AUTO_WRITEBACK_EN),
+		       priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
+	} else if (!strcmp(args[0], "UE")) {
+		regval = readl(priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
+		regval = (regval & ~(NPCM_ECC_CTL_XOR_BITS_MASK)) |
+				 (ECC_DOUBLE_MULTI_ERR_SYND << XOR_CHECK_BIT_SPLIT_WIDTH);
+		writel(regval, priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
+	}
+
+	/* Assert fwc */
+	writel((NPCM_ECC_CTL_FORCE_WC | readl(priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg)),
+	       priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
+
+	return count;
+}
+
+static DEVICE_ATTR_RW(forced_ecc_error);
+static int create_sysfs_attributes(struct mem_ctl_info *mci)
+{
+	int rc;
+
+	rc = device_create_file(&mci->dev, &dev_attr_forced_ecc_error);
+	if (rc < 0)
+		return rc;
+	return 0;
+}
+
+static void remove_sysfs_attributes(struct mem_ctl_info *mci)
+{
+	device_remove_file(&mci->dev, &dev_attr_forced_ecc_error);
+}
+
+#endif
+
+static const struct npcm_edac_platform_data npcm7xx_edac = {
+	.chip = NPCM7XX_CHIP,
+
+	/* CDNS DDR4 Controller Registers */
+	.ecc_ctl_en_reg = 0x174,
+	.ecc_ctl_int_status = 0x1D0,
+	.ecc_ctl_int_ack = 0x1D4,
+	.ecc_ctl_int_mask_master = 0x1D8,
+
+	.ecc_sig_ecc_c_addr_l = 0x188,
+	.ecc_sig_ecc_c_data_l = 0x190,
+	.ecc_sig_ecc_c_id = 0x194,
+	.ecc_sig_ecc_c_synd = 0x18C,
+
+	.ecc_sig_ecc_u_addr_l = 0x17C,
+	.ecc_sig_ecc_u_data_l = 0x184,
+	.ecc_sig_ecc_u_id = 0x194,
+	.ecc_sig_ecc_u_synd = 0x180,
+
+	/* MASK */
+	.ecc_ctl_ecc_enable_mask = BIT(24),
+	.ecc_ctl_en_int_master_mask = GENMASK(30, 7) | GENMASK(2, 0),
+
+	/* ECC IRQ Macros */
+	.ecc_int_ce_event = BIT(3),
+	.ecc_int_second_ce_event = BIT(4),
+	.ecc_int_ue_event = BIT(5),
+	.ecc_int_second_ue_event = BIT(6),
+	.ecc_int_ce_ue_mask = GENMASK(6, 3),
+	.ecc_ce_intr_mask = GENMASK(4, 3),
+	.ecc_ue_intr_mask = GENMASK(6, 5),
+
+	/* ECC Signature Macros */
+	.ecc_sig_ecc_c_id_shift = 16,
+	.ecc_sig_ecc_c_synd_shift = 0,
+
+	.ecc_sig_ecc_c_id_mask = GENMASK(29, 16),
+	.ecc_sig_ecc_c_synd_mask = GENMASK(6, 0),
+
+	.ecc_sig_ecc_u_id_shift = 0,
+	.ecc_sig_ecc_u_synd_shift = 0,
+
+	.ecc_sig_ecc_u_id_mask = GENMASK(13, 0),
+	.ecc_sig_ecc_u_synd_mask = GENMASK(6, 0),
+};
+
+static const struct npcm_edac_platform_data npcm8xx_edac = {
+#ifdef CONFIG_EDAC_DEBUG
+	.ip_features = FORCED_ECC_ERR_EVENT_SUPPORT,
+	.ddr_ctl_controller_busy_reg = 0x20C,
+	.ecc_ctl_xor_check_bits_reg = 0x174,
+#endif
+
+	.chip = NPCM8XX_CHIP,
+
+	/* CDNS DDR4 Controller Registers */
+	.ddr_ctl_mem_type_reg = 0x000,
+	.ddr_ctl_mem_width_reg = 0x00c,
+
+	.ecc_ctl_en_reg = 0x16C,
+	.ecc_ctl_int_status = 0x228,
+	.ecc_ctl_int_ack = 0x244,
+	.ecc_ctl_int_mask_master = 0x220,
+	.ecc_ctl_int_mask_ecc = 0x260,
+
+	.ecc_sig_ecc_c_addr_l = 0x18C,
+	.ecc_sig_ecc_c_addr_h = 0x190,
+	.ecc_sig_ecc_c_data_l = 0x194,
+	.ecc_sig_ecc_c_data_h = 0x198,
+	.ecc_sig_ecc_c_id = 0x19C,
+	.ecc_sig_ecc_c_synd = 0x190,
+
+	.ecc_sig_ecc_u_addr_l = 0x17C,
+	.ecc_sig_ecc_u_addr_h = 0x180,
+	.ecc_sig_ecc_u_data_l = 0x184,
+	.ecc_sig_ecc_u_data_h = 0x188,
+	.ecc_sig_ecc_u_id = 0x19C,
+	.ecc_sig_ecc_u_synd = 0x180,
+
+	/* MASK */
+	.ecc_ctl_ecc_enable_mask = GENMASK(17, 16),
+	.ecc_ctl_en_int_master_mask = GENMASK(30, 3) | GENMASK(1, 0),
+	.ecc_ctl_en_int_ecc_mask = GENMASK(8, 4),
+
+	/* ECC IRQ Macros */
+	.ecc_int_ce_event = BIT(0),
+	.ecc_int_second_ce_event = BIT(1),
+	.ecc_int_ue_event = BIT(2),
+	.ecc_int_second_ue_event = BIT(3),
+	.ecc_int_ce_ue_mask = GENMASK(3, 0),
+	.ecc_ce_intr_mask = GENMASK(1, 0),
+	.ecc_ue_intr_mask = GENMASK(3, 2),
+
+	/* ECC Signature Macros */
+	.ecc_sig_ecc_c_id_shift = 8,
+	.ecc_sig_ecc_c_synd_shift = 8,
+	.ecc_sig_ecc_c_addr_h_mask = GENMASK(1, 0),
+	.ecc_sig_ecc_c_id_mask = GENMASK(29, 16),
+	.ecc_sig_ecc_c_synd_mask = GENMASK(15, 8),
+
+	.ecc_sig_ecc_u_id_shift = 0,
+	.ecc_sig_ecc_u_synd_shift = 8,
+	.ecc_sig_ecc_u_addr_h_mask = GENMASK(1, 0),
+	.ecc_sig_ecc_u_id_mask = GENMASK(13, 0),
+	.ecc_sig_ecc_u_synd_mask = GENMASK(15, 8),
+};
+
+static const struct of_device_id npcm_edac_of_match[] = {
+	{ .compatible = "nuvoton,npcm845-memory-controller", .data = &npcm8xx_edac },
+	{ .compatible = "nuvoton,npcm750-memory-controller", .data = &npcm7xx_edac },
+	{},
+};
+
+MODULE_DEVICE_TABLE(of, npcm_edac_of_match);
+
+static int npcm_edac_mc_probe(struct platform_device *pdev)
+{
+	const struct npcm_edac_platform_data *npcm_chip;
+	struct device *dev = &pdev->dev;
+	struct edac_mc_layer layers[1];
+	const struct of_device_id *id;
+	struct priv_data *priv_data;
+	struct mem_ctl_info *mci;
+	struct resource *res;
+	void __iomem *reg;
+	int ret = -ENODEV;
+	int irq;
+	u32 ecc_en;
+
+	id = of_match_device(npcm_edac_of_match, &pdev->dev);
+
+	npcm_chip = of_device_get_match_data(&pdev->dev);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	reg = devm_ioremap_resource(dev, res);
+	if (IS_ERR(reg)) {
+		edac_printk(KERN_ERR, NPCM_EDAC_MOD_NAME,
+			    "cdns DDR4 mc regs are not defined\n");
+		return PTR_ERR(reg);
+	}
+
+	ecc_en = readl(reg + npcm_chip->ecc_ctl_en_reg);
+
+	if ((ecc_en & npcm_chip->ecc_ctl_ecc_enable_mask) == npcm_chip->ecc_ctl_ecc_enable_mask) {
+		edac_printk(KERN_INFO, NPCM_EDAC_MOD_NAME, "ECC reporting and correcting on. ");
+	} else {
+		edac_printk(KERN_INFO, NPCM_EDAC_MOD_NAME, "ECC disabled\n");
+		return -ENXIO;
+	}
+
+	edac_printk(KERN_INFO, NPCM_EDAC_MOD_NAME,
+		    "IO mapped reg addr: %p\n", reg);
+	layers[0].type = EDAC_MC_LAYER_ALL_MEM;
+	layers[0].size = 1;
+
+	mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers,
+			    sizeof(struct priv_data));
+	if (!mci) {
+		edac_printk(KERN_ERR, NPCM_EDAC_MOD_NAME,
+			    "Failed memory allocation for mc instance\n");
+		return -ENOMEM;
+	}
+	mci->pdev = &pdev->dev;
+	priv_data = mci->pvt_info;
+	priv_data->reg = reg;
+	priv_data->npcm_chip = npcm_chip;
+	priv_data->ce_cnt = 0;
+	priv_data->ue_cnt = 0;
+	platform_set_drvdata(pdev, mci);
+
+	/* Initialize controller capabilities */
+	mci->mtype_cap = MEM_FLAG_DDR4;
+	mci->edac_ctl_cap = EDAC_FLAG_SECDED;
+	mci->scrub_cap = SCRUB_FLAG_HW_SRC;
+	mci->scrub_mode = SCRUB_HW_SRC;
+	mci->edac_cap = EDAC_FLAG_SECDED;
+	mci->ctl_name = id->compatible;
+	mci->dev_name = dev_name(&pdev->dev);
+	mci->mod_name = NPCM_EDAC_MOD_NAME;
+	mci->ctl_page_to_phys = NULL;
+
+	/* Interrupt feature is supported by cadence mc */
+	edac_op_state = EDAC_OPSTATE_INT;
+#ifdef CONFIG_EDAC_DEBUG
+	init_mem_layout(mci);
+#endif
+	/* Setup Interrupt handler for ECC */
+	irq = platform_get_irq(pdev, 0);
+	if (!irq) {
+		edac_printk(KERN_ERR, NPCM_EDAC_MOD_NAME,
+			    "irq number not defined for ECC.\n");
+		goto err;
+	}
+	ret = devm_request_irq(dev, irq, edac_ecc_isr, 0,
+			       "cdns-edac-mc-ecc-irq", mci);
+	if (ret) {
+		edac_printk(KERN_ERR, NPCM_EDAC_MOD_NAME,
+			    "request_irq fail for NPCM_EDAC irq\n");
+		goto err;
+	}
+	ret = edac_mc_add_mc(mci);
+	if (ret) {
+		edac_printk(KERN_ERR, NPCM_EDAC_MOD_NAME,
+			    "Failed to register with EDAC core\n");
+		goto err;
+	}
+
+#ifdef CONFIG_EDAC_DEBUG
+	if ((npcm_chip->ip_features & FORCED_ECC_ERR_EVENT_SUPPORT) &&
+	    npcm_chip->chip == NPCM8XX_CHIP) {
+		if (create_sysfs_attributes(mci)) {
+			edac_printk(KERN_ERR, NPCM_EDAC_MOD_NAME,
+				    "Failed to create sysfs entries\n");
+			goto err1;
+		}
+	}
+#endif
+
+	/* Only enable MC interrupts with ECC - clear global int mask bit and ecc bit */
+	writel(npcm_chip->ecc_ctl_en_int_master_mask,
+	       priv_data->reg + npcm_chip->ecc_ctl_int_mask_master);
+
+	if (npcm_chip->chip == NPCM8XX_CHIP) {
+		/* clear single and multi for ce and ue */
+		writel(npcm_chip->ecc_ctl_en_int_ecc_mask,
+		       priv_data->reg + npcm_chip->ecc_ctl_int_mask_ecc);
+	}
+
+	return 0;
+
+#ifdef CONFIG_EDAC_DEBUG
+err1:
+#endif
+
+	edac_mc_del_mc(&pdev->dev);
+
+err:
+	edac_mc_free(mci);
+	return ret;
+}
+
+static int npcm_edac_mc_remove(struct platform_device *pdev)
+{
+	struct mem_ctl_info *mci = platform_get_drvdata(pdev);
+	struct priv_data *priv = mci->pvt_info;
+	const struct npcm_edac_platform_data *npcm_chip = priv->npcm_chip;
+
+	writel(NPCM_ECC_CTL_GLOBAL_INT_DISABLE, priv->reg + npcm_chip->ecc_ctl_int_mask_master);
+
+	/* Disable ecc feature before removing driver by writing 0 */
+	writel((unsigned int)(~(npcm_chip->ecc_ctl_ecc_enable_mask)),
+	       priv->reg + npcm_chip->ecc_ctl_en_reg);
+
+#ifdef CONFIG_EDAC_DEBUG
+	remove_sysfs_attributes(mci);
+#endif
+	edac_mc_del_mc(&pdev->dev);
+	edac_mc_free(mci);
+
+	return 0;
+}
+
+static struct platform_driver npcm_edac_mc_driver = {
+	.driver = {
+		   .name = "npcm-edac",
+		   .of_match_table = npcm_edac_of_match,
+	},
+	.probe = npcm_edac_mc_probe,
+	.remove = npcm_edac_mc_remove,
+};
+
+module_platform_driver(npcm_edac_mc_driver);
+
+MODULE_AUTHOR("Medad <ctcchien@nuvoton.com>");
+MODULE_DESCRIPTION("Nuvoton NPCM EDAC Driver");
+MODULE_LICENSE("GPL v2");
-- 
2.17.1

Re: [PATCH v6 3/3] EDAC: nuvoton: Add NPCM memory controller driver

[Borislav Petkov]

On Tue, Mar 22, 2022 at 11:01:52AM +0800, Medad CChien wrote:
> Add support for Nuvoton NPCM SoC.
> 
> Signed-off-by: Medad CChien <ctcchien@nuvoton.com>
> 
> Reported-by: kernel test robot <lkp@intel.com>
> 
> All errors (new ones prefixed by >>):

I'm sure you can summarize this in one sentence instead of pasting all
the warnings in the commit message where they don't belong.

...

> diff --git a/drivers/edac/npcm_edac.c b/drivers/edac/npcm_edac.c
> new file mode 100644
> index 000000000000..9dd05bec0b7f
> --- /dev/null
> +++ b/drivers/edac/npcm_edac.c
> @@ -0,0 +1,706 @@
> +// SPDX-License-Identifier: GPL-2.0
> +// Copyright (c) 2022 Nuvoton Technology corporation.
> +
> +#include <linux/delay.h>
> +#include <linux/of_device.h>
> +
> +#include "edac_module.h"
> +
> +#define NPCM_EDAC_MOD_NAME "npcm-edac"
> +#define FORCED_ECC_ERR_EVENT_SUPPORT	BIT(1)
> +#define EDAC_MSG_SIZE                  256
> +/* Granularity of reported error in bytes */
> +#define NPCM_EDAC_ERR_GRAIN		1
> +
> +#define MEM_TYPE_DDR4			0xA
> +
> +#define NPCM8XX_CHIP			0x800
> +#define NPCM7XX_CHIP			0x700
> +
> +/* Control register width definitions */
> +#define WDTH_16				(2)
> +#define WDTH_32				(1)
> +#define WDTH_64				(0)
> +#define CTL_MEM_MAX_WIDTH_MASK		GENMASK(4, 0)
> +#define CTL_REG_WIDTH_SHIFT		(32)
> +#define XOR_CHECK_BIT_SPLIT_WIDTH		(16)
> +#define CTL_CONTROLLER_BUSY_FLAG	BIT(0)
> +#define NPCM_ECC_CTL_FORCE_WC		BIT(8)
> +#define NPCM_ECC_CTL_AUTO_WRITEBACK_EN	BIT(24)
> +#define NPCM_ECC_CTL_XOR_BITS_MASK		GENMASK(23, 16)
> +#define NPCM_ECC_CTL_MTYPE_MASK			GENMASK(11, 8)
> +#define NPCM_ECC_CTL_GLOBAL_INT_DISABLE	BIT(31)

Align those values vertically pls.

> +
> +#ifdef CONFIG_EDAC_DEBUG
> +
> +/* Syndrome values */
> +#define ECC_DOUBLE_MULTI_ERR_SYND	0x03
> +
> +static char data_synd[] = {
> +			0xf4, 0xf1, 0xec, 0xea, 0xe9, 0xe6, 0xe5, 0xe3,
> +			0xdc, 0xda, 0xd9, 0xd6, 0xd5, 0xd3, 0xce, 0xcb,
> +			0xb5, 0xb0, 0xad, 0xab, 0xa8, 0xa7, 0xa4, 0xa2,
> +			0x9d, 0x9b, 0x98, 0x97, 0x94, 0x92, 0x8f, 0x8a,
> +			0x75, 0x70, 0x6d, 0x6b, 0x68, 0x67, 0x64, 0x62,
> +			0x5e, 0x5b, 0x58, 0x57, 0x54, 0x52, 0x4f, 0x4a,
> +			0x34, 0x31, 0x2c, 0x2a, 0x29, 0x26, 0x25, 0x23,
> +			0x1c, 0x1a, 0x19, 0x16, 0x15, 0x13, 0x0e, 0x0b
> +		  };
> +
> +static char check_synd[] = {0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80};
> +#endif
> +
> +struct npcm_edac_platform_data {
> +	/* force ECC event */
> +	u32 ip_features;
> +	u32 ddr_ctl_controller_busy_reg;
> +	u32 ecc_ctl_xor_check_bits_reg;
> +
> +	u32 chip;
> +
> +	/* DDR4 Controller Registers */
> +	u32 ddr_ctl_mem_type_reg;
> +	u32 ddr_ctl_mem_width_reg;
> +
> +	u32 ecc_ctl_en_reg;
> +	u32 ecc_ctl_int_mask;
> +	u32 ecc_ctl_int_status;
> +	u32 ecc_ctl_int_ack;
> +	u32 ecc_ctl_int_mask_master;
> +	u32 ecc_ctl_int_mask_ecc;
> +
> +	u32 ecc_sig_ecc_c_addr_l;
> +	u32 ecc_sig_ecc_c_addr_h;
> +	u32 ecc_sig_ecc_c_data_l;
> +	u32 ecc_sig_ecc_c_data_h;
> +	u32 ecc_sig_ecc_c_id;
> +	u32 ecc_sig_ecc_c_synd;
> +
> +	u32 ecc_sig_ecc_u_addr_l;
> +	u32 ecc_sig_ecc_u_addr_h;
> +	u32 ecc_sig_ecc_u_data_l;
> +	u32 ecc_sig_ecc_u_data_h;
> +	u32 ecc_sig_ecc_u_id;
> +	u32 ecc_sig_ecc_u_synd;
> +
> +	/* MASK */
> +	u32 ecc_ctl_ecc_enable_mask;
> +	u32 ecc_ctl_en_int_master_mask;
> +	u32 ecc_ctl_en_int_ecc_mask;
> +
> +	/* ECC IRQ Macros */
> +	u32 ecc_int_ce_event;
> +	u32 ecc_int_second_ce_event;
> +	u32 ecc_int_ue_event;
> +	u32 ecc_int_second_ue_event;
> +	u32 ecc_int_ce_ue_mask;
> +	u32 ecc_ce_intr_mask;
> +	u32 ecc_ue_intr_mask;
> +
> +	/* ECC Signature Macros */
> +	u32 ecc_sig_ecc_c_id_shift;
> +	u32 ecc_sig_ecc_c_synd_shift;
> +	u32 ecc_sig_ecc_c_addr_h_mask;
> +	u32 ecc_sig_ecc_c_id_mask;
> +	u32 ecc_sig_ecc_c_synd_mask;
> +
> +	u32 ecc_sig_ecc_u_id_shift;
> +	u32 ecc_sig_ecc_u_synd_shift;
> +	u32 ecc_sig_ecc_u_addr_h_mask;
> +	u32 ecc_sig_ecc_u_id_mask;
> +	u32 ecc_sig_ecc_u_synd_mask;

I'd try to shorten those if I were you - "ecc_sig_" could go, "ecc_int_"
too. Then the code accessing them would become more readable and you
won't have to break long lines.

> +};
> +
> +struct priv_data {
> +	void __iomem *reg;
> +	u32 ce_cnt;
> +	u32 ue_cnt;
> +	char message[EDAC_MSG_SIZE];
> +	const struct npcm_edac_platform_data *npcm_chip;
> +};
> +
> +#ifdef CONFIG_EDAC_DEBUG

Move that ifdeffery...

> +static void init_mem_layout(struct mem_ctl_info *mci)
> +{

... here and then you won't need the ifdeffery at the call site below.

> +	struct priv_data *priv = mci->pvt_info;
> +	const struct npcm_edac_platform_data *npcm_chip = priv->npcm_chip;
> +	struct csrow_info *csi;
> +	struct dimm_info *dimm;
> +	struct sysinfo inf;
> +	enum mem_type mtype;
> +	u32 val, width;
> +	u32 size, row;
> +	u8 j;
> +
> +	dimm = edac_get_dimm(mci, 0, 0, 0);
> +	if (!dimm) {

Save an indentation level:

	if (dimm)
		return;

	si_meminfo(&inf);
	...

> +		si_meminfo(&inf);
> +		for (row = 0; row < mci->nr_csrows; row++) {
> +			csi = mci->csrows[row];
> +			size = inf.totalram * inf.mem_unit;
> +
> +			for (j = 0; j < csi->nr_channels; j++) {
> +				dimm            = csi->channels[j]->dimm;
> +				dimm->edac_mode = EDAC_FLAG_SECDED;
> +				/* Get memory type by reading hw registers*/
> +				val = readl(priv->reg + npcm_chip->ddr_ctl_mem_type_reg);
> +				mtype = val & NPCM_ECC_CTL_MTYPE_MASK;
> +
> +				if (mtype == MEM_TYPE_DDR4)
> +					dimm->mtype = MEM_DDR4;
> +				else
> +					dimm->mtype = MEM_EMPTY;
> +
> +				/*Get EDAC devtype width for the current mc*/

Put spaces between the * and the text. There are other comments who have
this, pls fix them all.

> +				width = readl(priv->reg + npcm_chip->ddr_ctl_mem_width_reg)
> +					      & CTL_MEM_MAX_WIDTH_MASK;
> +				switch (width) {
> +				case WDTH_16:
> +					dimm->dtype  = DEV_X2;
> +					break;
> +				case WDTH_32:
> +					dimm->dtype  = DEV_X4;
> +					break;
> +				case WDTH_64:
> +					dimm->dtype  = DEV_X8;
> +					break;
> +				default:
> +					dimm->dtype = DEV_UNKNOWN;
> +				}
> +
> +				dimm->nr_pages  = (size >> PAGE_SHIFT) /
> +					csi->nr_channels;
> +				dimm->grain     = NPCM_EDAC_ERR_GRAIN;
> +			}
> +		}
> +	}
> +}
> +#endif
> +
> +static void handle_ce(struct mem_ctl_info *mci)
> +{
> +	struct priv_data *priv = mci->pvt_info;
> +	const struct npcm_edac_platform_data *npcm_chip = priv->npcm_chip;
> +	u64 err_c_addr = 0x0;
> +	u64 err_c_data = 0x0;
> +	u32 err_c_synd, err_c_id;
> +	u32 sig_val_l, sig_val_h;
> +
> +	sig_val_l = readl(priv->reg + npcm_chip->ecc_sig_ecc_c_addr_l);
> +
> +	if (npcm_chip->chip == NPCM8XX_CHIP)
> +		sig_val_h = (readl(priv->reg + npcm_chip->ecc_sig_ecc_c_addr_h) &
> +				npcm_chip->ecc_sig_ecc_c_addr_h_mask);
> +	else
> +		sig_val_h = 0x0;

assign those vars to 0 at declaration time and you won't need the else
branch here...

> +
> +	err_c_addr = (((err_c_addr | sig_val_h) <<
> +				CTL_REG_WIDTH_SHIFT) | sig_val_l);
> +
> +	sig_val_l = readl(priv->reg + npcm_chip->ecc_sig_ecc_c_data_l);
> +
> +	if (npcm_chip->chip == NPCM8XX_CHIP)
> +		sig_val_h = readl(priv->reg + npcm_chip->ecc_sig_ecc_c_data_h);
> +	else
> +		sig_val_h = 0x0;

... and here.

Ditto for handle_ue() below.

> +	err_c_data = (((err_c_data | sig_val_h) <<
> +				CTL_REG_WIDTH_SHIFT) | sig_val_l);
> +
> +	err_c_id = ((readl(priv->reg + npcm_chip->ecc_sig_ecc_c_id) &
> +				npcm_chip->ecc_sig_ecc_c_id_mask) >>
> +				npcm_chip->ecc_sig_ecc_c_id_shift);
> +
> +	err_c_synd = ((readl(priv->reg + npcm_chip->ecc_sig_ecc_c_synd) &
> +				npcm_chip->ecc_sig_ecc_c_synd_mask) >>
> +				npcm_chip->ecc_sig_ecc_c_synd_shift);
> +
> +	priv->ce_cnt = priv->ce_cnt + 1;
> +
> +	snprintf(priv->message,
> +		 EDAC_MSG_SIZE, "DDR ECC %s: data=0x%llx source_id=%#08x",
> +		 mci->ctl_name, err_c_data, err_c_id);
> +
> +	edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci,
> +			     1,
> +			     err_c_addr >> PAGE_SHIFT,
> +			     err_c_addr & ~PAGE_MASK,
> +			     err_c_synd, 0, 0, -1,
> +			     priv->message, "");
> +}
>

...

> +static ssize_t forced_ecc_error_store(struct device *dev,
> +				      struct device_attribute *mattr,
> +				      const char *data, size_t count)
> +{
> +	struct mem_ctl_info *mci = to_mci(dev);
> +	struct priv_data *priv = mci->pvt_info;
> +	const struct npcm_edac_platform_data *npcm_chip = priv->npcm_chip;
> +	int	args_cnt;
> +	int	ret;
> +	char	**args;
> +	u32	regval;
> +	u8	bit_no;
> +
> +	/* Split string buffer into separate parameters */
> +	args = argv_split(GFP_KERNEL, data, &args_cnt);

Move that args splitting...

> +
> +	/* Check ecc enabled */
> +	if (!(readl(priv->reg + npcm_chip->ecc_ctl_en_reg) & npcm_chip->ecc_ctl_ecc_enable_mask))
> +		return count;
> +
> +	/* Check no write operation pending to controller*/
> +	while (readl(priv->reg + npcm_chip->ddr_ctl_controller_busy_reg) &
> +			CTL_CONTROLLER_BUSY_FLAG) {
> +		usleep_range(1000, 10000);
> +	}

... here.

> +
> +	/* Write appropriate syndrome to xor_check_bit*/

Any documentation about the string being written to debugfs here? I
wouldn't want to read the source each time :)

> +	if (!strcmp(args[0], "CE") && args_cnt == 3) {
> +		ret = kstrtou8(args[2], 0, &bit_no);
> +		if (ret)
> +			return ret;
> +		if (!strcmp(args[1], "checkcode")) {
> +			if (bit_no > 7) {
> +				edac_printk(KERN_INFO, NPCM_EDAC_MOD_NAME, "bit_no for checkcode must be 0~7\n");
> +				return count;
> +			}
> +			regval = readl(priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
> +			regval = (regval & ~(NPCM_ECC_CTL_XOR_BITS_MASK)) |
> +				(check_synd[bit_no] << XOR_CHECK_BIT_SPLIT_WIDTH);
> +			writel(regval, priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
> +		} else if (!strcmp(args[1], "data")) {
> +			if (bit_no > 63) {
> +				edac_printk(KERN_INFO, NPCM_EDAC_MOD_NAME, "bit_no for data must be 0~63\n");
> +				return count;
> +			}
> +			regval = readl(priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
> +			regval = (regval & ~(NPCM_ECC_CTL_XOR_BITS_MASK)) |
> +					 (data_synd[bit_no] << XOR_CHECK_BIT_SPLIT_WIDTH);
> +			writel(regval, priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
> +		}
> +		/* Enable the ECC writeback_en for corrected error */
> +		regval = readl(priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
> +		writel((regval | NPCM_ECC_CTL_AUTO_WRITEBACK_EN),
> +		       priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
> +	} else if (!strcmp(args[0], "UE")) {
> +		regval = readl(priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
> +		regval = (regval & ~(NPCM_ECC_CTL_XOR_BITS_MASK)) |
> +				 (ECC_DOUBLE_MULTI_ERR_SYND << XOR_CHECK_BIT_SPLIT_WIDTH);
> +		writel(regval, priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
> +	}
> +
> +	/* Assert fwc */
> +	writel((NPCM_ECC_CTL_FORCE_WC | readl(priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg)),
> +	       priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
> +
> +	return count;
> +}

...

> +#ifdef CONFIG_EDAC_DEBUG
> +	if ((npcm_chip->ip_features & FORCED_ECC_ERR_EVENT_SUPPORT) &&
> +	    npcm_chip->chip == NPCM8XX_CHIP) {
> +		if (create_sysfs_attributes(mci)) {
> +			edac_printk(KERN_ERR, NPCM_EDAC_MOD_NAME,
> +				    "Failed to create sysfs entries\n");
> +			goto err1;
> +		}
> +	}
> +#endif
> +
> +	/* Only enable MC interrupts with ECC - clear global int mask bit and ecc bit */
> +	writel(npcm_chip->ecc_ctl_en_int_master_mask,
> +	       priv_data->reg + npcm_chip->ecc_ctl_int_mask_master);
> +
> +	if (npcm_chip->chip == NPCM8XX_CHIP) {
> +		/* clear single and multi for ce and ue */
> +		writel(npcm_chip->ecc_ctl_en_int_ecc_mask,
> +		       priv_data->reg + npcm_chip->ecc_ctl_int_mask_ecc);
> +	}
> +
> +	return 0;
> +
> +#ifdef CONFIG_EDAC_DEBUG
> +err1:
> +#endif

This is just silly. Why should loading of the driver fail when it cannot
create a couple of sysfs debugging helpers? I think you're fine if you
simply issue the error message but continue.

> +
> +	edac_mc_del_mc(&pdev->dev);
> +
> +err:
> +	edac_mc_free(mci);
> +	return ret;
> +}
> +
> +static int npcm_edac_mc_remove(struct platform_device *pdev)
> +{
> +	struct mem_ctl_info *mci = platform_get_drvdata(pdev);
> +	struct priv_data *priv = mci->pvt_info;
> +	const struct npcm_edac_platform_data *npcm_chip = priv->npcm_chip;
> +
> +	writel(NPCM_ECC_CTL_GLOBAL_INT_DISABLE, priv->reg + npcm_chip->ecc_ctl_int_mask_master);
> +
> +	/* Disable ecc feature before removing driver by writing 0 */
> +	writel((unsigned int)(~(npcm_chip->ecc_ctl_ecc_enable_mask)),
> +	       priv->reg + npcm_chip->ecc_ctl_en_reg);
> +
> +#ifdef CONFIG_EDAC_DEBUG
> +	remove_sysfs_attributes(mci);
> +#endif
> +	edac_mc_del_mc(&pdev->dev);
> +	edac_mc_free(mci);
> +
> +	return 0;
> +}
> +
> +static struct platform_driver npcm_edac_mc_driver = {
> +	.driver = {
> +		   .name = "npcm-edac",
> +		   .of_match_table = npcm_edac_of_match,
> +	},
> +	.probe = npcm_edac_mc_probe,
> +	.remove = npcm_edac_mc_remove,
> +};
> +
> +module_platform_driver(npcm_edac_mc_driver);
> +
> +MODULE_AUTHOR("Medad <ctcchien@nuvoton.com>");
			^^

Your surname too pls.

> +MODULE_DESCRIPTION("Nuvoton NPCM EDAC Driver");
> +MODULE_LICENSE("GPL v2");
> -- 
> 2.17.1
> 

-- 
Regards/Gruss,
    Boris.

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

Re: [PATCH v6 3/3] EDAC: nuvoton: Add NPCM memory controller driver

[Medad Young]

Dear Borislav,

thanks for your comments


Borislav Petkov <bp@alien8.de> 於 2022年4月9日 週六 上午3:05寫道：
>
> On Tue, Mar 22, 2022 at 11:01:52AM +0800, Medad CChien wrote:
> > Add support for Nuvoton NPCM SoC.
> >
> > Signed-off-by: Medad CChien <ctcchien@nuvoton.com>
> >
> > Reported-by: kernel test robot <lkp@intel.com>
> >
> > All errors (new ones prefixed by >>):
>
> I'm sure you can summarize this in one sentence instead of pasting all
> the warnings in the commit message where they don't belong.

OK

>
> ...
>
> > diff --git a/drivers/edac/npcm_edac.c b/drivers/edac/npcm_edac.c
> > new file mode 100644
> > index 000000000000..9dd05bec0b7f
> > --- /dev/null
> > +++ b/drivers/edac/npcm_edac.c
> > @@ -0,0 +1,706 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +// Copyright (c) 2022 Nuvoton Technology corporation.
> > +
> > +#include <linux/delay.h>
> > +#include <linux/of_device.h>
> > +
> > +#include "edac_module.h"
> > +
> > +#define NPCM_EDAC_MOD_NAME "npcm-edac"
> > +#define FORCED_ECC_ERR_EVENT_SUPPORT BIT(1)
> > +#define EDAC_MSG_SIZE                  256
> > +/* Granularity of reported error in bytes */
> > +#define NPCM_EDAC_ERR_GRAIN          1
> > +
> > +#define MEM_TYPE_DDR4                        0xA
> > +
> > +#define NPCM8XX_CHIP                 0x800
> > +#define NPCM7XX_CHIP                 0x700
> > +
> > +/* Control register width definitions */
> > +#define WDTH_16                              (2)
> > +#define WDTH_32                              (1)
> > +#define WDTH_64                              (0)
> > +#define CTL_MEM_MAX_WIDTH_MASK               GENMASK(4, 0)
> > +#define CTL_REG_WIDTH_SHIFT          (32)
> > +#define XOR_CHECK_BIT_SPLIT_WIDTH            (16)
> > +#define CTL_CONTROLLER_BUSY_FLAG     BIT(0)
> > +#define NPCM_ECC_CTL_FORCE_WC                BIT(8)
> > +#define NPCM_ECC_CTL_AUTO_WRITEBACK_EN       BIT(24)
> > +#define NPCM_ECC_CTL_XOR_BITS_MASK           GENMASK(23, 16)
> > +#define NPCM_ECC_CTL_MTYPE_MASK                      GENMASK(11, 8)
> > +#define NPCM_ECC_CTL_GLOBAL_INT_DISABLE      BIT(31)
>
> Align those values vertically pls.

Ok

>
> > +
> > +#ifdef CONFIG_EDAC_DEBUG
> > +
> > +/* Syndrome values */
> > +#define ECC_DOUBLE_MULTI_ERR_SYND    0x03
> > +
> > +static char data_synd[] = {
> > +                     0xf4, 0xf1, 0xec, 0xea, 0xe9, 0xe6, 0xe5, 0xe3,
> > +                     0xdc, 0xda, 0xd9, 0xd6, 0xd5, 0xd3, 0xce, 0xcb,
> > +                     0xb5, 0xb0, 0xad, 0xab, 0xa8, 0xa7, 0xa4, 0xa2,
> > +                     0x9d, 0x9b, 0x98, 0x97, 0x94, 0x92, 0x8f, 0x8a,
> > +                     0x75, 0x70, 0x6d, 0x6b, 0x68, 0x67, 0x64, 0x62,
> > +                     0x5e, 0x5b, 0x58, 0x57, 0x54, 0x52, 0x4f, 0x4a,
> > +                     0x34, 0x31, 0x2c, 0x2a, 0x29, 0x26, 0x25, 0x23,
> > +                     0x1c, 0x1a, 0x19, 0x16, 0x15, 0x13, 0x0e, 0x0b
> > +               };
> > +
> > +static char check_synd[] = {0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80};
> > +#endif
> > +
> > +struct npcm_edac_platform_data {
> > +     /* force ECC event */
> > +     u32 ip_features;
> > +     u32 ddr_ctl_controller_busy_reg;
> > +     u32 ecc_ctl_xor_check_bits_reg;
> > +
> > +     u32 chip;
> > +
> > +     /* DDR4 Controller Registers */
> > +     u32 ddr_ctl_mem_type_reg;
> > +     u32 ddr_ctl_mem_width_reg;
> > +
> > +     u32 ecc_ctl_en_reg;
> > +     u32 ecc_ctl_int_mask;
> > +     u32 ecc_ctl_int_status;
> > +     u32 ecc_ctl_int_ack;
> > +     u32 ecc_ctl_int_mask_master;
> > +     u32 ecc_ctl_int_mask_ecc;
> > +
> > +     u32 ecc_sig_ecc_c_addr_l;
> > +     u32 ecc_sig_ecc_c_addr_h;
> > +     u32 ecc_sig_ecc_c_data_l;
> > +     u32 ecc_sig_ecc_c_data_h;
> > +     u32 ecc_sig_ecc_c_id;
> > +     u32 ecc_sig_ecc_c_synd;
> > +
> > +     u32 ecc_sig_ecc_u_addr_l;
> > +     u32 ecc_sig_ecc_u_addr_h;
> > +     u32 ecc_sig_ecc_u_data_l;
> > +     u32 ecc_sig_ecc_u_data_h;
> > +     u32 ecc_sig_ecc_u_id;
> > +     u32 ecc_sig_ecc_u_synd;
> > +
> > +     /* MASK */
> > +     u32 ecc_ctl_ecc_enable_mask;
> > +     u32 ecc_ctl_en_int_master_mask;
> > +     u32 ecc_ctl_en_int_ecc_mask;
> > +
> > +     /* ECC IRQ Macros */
> > +     u32 ecc_int_ce_event;
> > +     u32 ecc_int_second_ce_event;
> > +     u32 ecc_int_ue_event;
> > +     u32 ecc_int_second_ue_event;
> > +     u32 ecc_int_ce_ue_mask;
> > +     u32 ecc_ce_intr_mask;
> > +     u32 ecc_ue_intr_mask;
> > +
> > +     /* ECC Signature Macros */
> > +     u32 ecc_sig_ecc_c_id_shift;
> > +     u32 ecc_sig_ecc_c_synd_shift;
> > +     u32 ecc_sig_ecc_c_addr_h_mask;
> > +     u32 ecc_sig_ecc_c_id_mask;
> > +     u32 ecc_sig_ecc_c_synd_mask;
> > +
> > +     u32 ecc_sig_ecc_u_id_shift;
> > +     u32 ecc_sig_ecc_u_synd_shift;
> > +     u32 ecc_sig_ecc_u_addr_h_mask;
> > +     u32 ecc_sig_ecc_u_id_mask;
> > +     u32 ecc_sig_ecc_u_synd_mask;
>
> I'd try to shorten those if I were you - "ecc_sig_" could go, "ecc_int_"
> too. Then the code accessing them would become more readable and you
> won't have to break long lines.

OK

>
> > +};
> > +
> > +struct priv_data {
> > +     void __iomem *reg;
> > +     u32 ce_cnt;
> > +     u32 ue_cnt;
> > +     char message[EDAC_MSG_SIZE];
> > +     const struct npcm_edac_platform_data *npcm_chip;
> > +};
> > +
> > +#ifdef CONFIG_EDAC_DEBUG
>
> Move that ifdeffery...
>
> > +static void init_mem_layout(struct mem_ctl_info *mci)
> > +{
>
> ... here and then you won't need the ifdeffery at the call site below.
>

OK


> > +     struct priv_data *priv = mci->pvt_info;
> > +     const struct npcm_edac_platform_data *npcm_chip = priv->npcm_chip;
> > +     struct csrow_info *csi;
> > +     struct dimm_info *dimm;
> > +     struct sysinfo inf;
> > +     enum mem_type mtype;
> > +     u32 val, width;
> > +     u32 size, row;
> > +     u8 j;
> > +
> > +     dimm = edac_get_dimm(mci, 0, 0, 0);
> > +     if (!dimm) {
>
> Save an indentation level:
>

OK

>         if (dimm)
>                 return;
>
>         si_meminfo(&inf);
>         ...
>
> > +             si_meminfo(&inf);
> > +             for (row = 0; row < mci->nr_csrows; row++) {
> > +                     csi = mci->csrows[row];
> > +                     size = inf.totalram * inf.mem_unit;
> > +
> > +                     for (j = 0; j < csi->nr_channels; j++) {
> > +                             dimm            = csi->channels[j]->dimm;
> > +                             dimm->edac_mode = EDAC_FLAG_SECDED;
> > +                             /* Get memory type by reading hw registers*/
> > +                             val = readl(priv->reg + npcm_chip->ddr_ctl_mem_type_reg);
> > +                             mtype = val & NPCM_ECC_CTL_MTYPE_MASK;
> > +
> > +                             if (mtype == MEM_TYPE_DDR4)
> > +                                     dimm->mtype = MEM_DDR4;
> > +                             else
> > +                                     dimm->mtype = MEM_EMPTY;
> > +
> > +                             /*Get EDAC devtype width for the current mc*/
>
> Put spaces between the * and the text. There are other comments who have
> this, pls fix them all.
>

OK

> > +                             width = readl(priv->reg + npcm_chip->ddr_ctl_mem_width_reg)
> > +                                           & CTL_MEM_MAX_WIDTH_MASK;
> > +                             switch (width) {
> > +                             case WDTH_16:
> > +                                     dimm->dtype  = DEV_X2;
> > +                                     break;
> > +                             case WDTH_32:
> > +                                     dimm->dtype  = DEV_X4;
> > +                                     break;
> > +                             case WDTH_64:
> > +                                     dimm->dtype  = DEV_X8;
> > +                                     break;
> > +                             default:
> > +                                     dimm->dtype = DEV_UNKNOWN;
> > +                             }
> > +
> > +                             dimm->nr_pages  = (size >> PAGE_SHIFT) /
> > +                                     csi->nr_channels;
> > +                             dimm->grain     = NPCM_EDAC_ERR_GRAIN;
> > +                     }
> > +             }
> > +     }
> > +}
> > +#endif
> > +
> > +static void handle_ce(struct mem_ctl_info *mci)
> > +{
> > +     struct priv_data *priv = mci->pvt_info;
> > +     const struct npcm_edac_platform_data *npcm_chip = priv->npcm_chip;
> > +     u64 err_c_addr = 0x0;
> > +     u64 err_c_data = 0x0;
> > +     u32 err_c_synd, err_c_id;
> > +     u32 sig_val_l, sig_val_h;
> > +
> > +     sig_val_l = readl(priv->reg + npcm_chip->ecc_sig_ecc_c_addr_l);
> > +
> > +     if (npcm_chip->chip == NPCM8XX_CHIP)
> > +             sig_val_h = (readl(priv->reg + npcm_chip->ecc_sig_ecc_c_addr_h) &
> > +                             npcm_chip->ecc_sig_ecc_c_addr_h_mask);
> > +     else
> > +             sig_val_h = 0x0;
>
> assign those vars to 0 at declaration time and you won't need the else
> branch here...
>

OK

> > +
> > +     err_c_addr = (((err_c_addr | sig_val_h) <<
> > +                             CTL_REG_WIDTH_SHIFT) | sig_val_l);
> > +
> > +     sig_val_l = readl(priv->reg + npcm_chip->ecc_sig_ecc_c_data_l);
> > +
> > +     if (npcm_chip->chip == NPCM8XX_CHIP)
> > +             sig_val_h = readl(priv->reg + npcm_chip->ecc_sig_ecc_c_data_h);
> > +     else
> > +             sig_val_h = 0x0;
>
> ... and here.
>
> Ditto for handle_ue() below.

OK

>
> > +     err_c_data = (((err_c_data | sig_val_h) <<
> > +                             CTL_REG_WIDTH_SHIFT) | sig_val_l);
> > +
> > +     err_c_id = ((readl(priv->reg + npcm_chip->ecc_sig_ecc_c_id) &
> > +                             npcm_chip->ecc_sig_ecc_c_id_mask) >>
> > +                             npcm_chip->ecc_sig_ecc_c_id_shift);
> > +
> > +     err_c_synd = ((readl(priv->reg + npcm_chip->ecc_sig_ecc_c_synd) &
> > +                             npcm_chip->ecc_sig_ecc_c_synd_mask) >>
> > +                             npcm_chip->ecc_sig_ecc_c_synd_shift);
> > +
> > +     priv->ce_cnt = priv->ce_cnt + 1;
> > +
> > +     snprintf(priv->message,
> > +              EDAC_MSG_SIZE, "DDR ECC %s: data=0x%llx source_id=%#08x",
> > +              mci->ctl_name, err_c_data, err_c_id);
> > +
> > +     edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci,
> > +                          1,
> > +                          err_c_addr >> PAGE_SHIFT,
> > +                          err_c_addr & ~PAGE_MASK,
> > +                          err_c_synd, 0, 0, -1,
> > +                          priv->message, "");
> > +}
> >
>
> ...
>
> > +static ssize_t forced_ecc_error_store(struct device *dev,
> > +                                   struct device_attribute *mattr,
> > +                                   const char *data, size_t count)
> > +{
> > +     struct mem_ctl_info *mci = to_mci(dev);
> > +     struct priv_data *priv = mci->pvt_info;
> > +     const struct npcm_edac_platform_data *npcm_chip = priv->npcm_chip;
> > +     int     args_cnt;
> > +     int     ret;
> > +     char    **args;
> > +     u32     regval;
> > +     u8      bit_no;
> > +
> > +     /* Split string buffer into separate parameters */
> > +     args = argv_split(GFP_KERNEL, data, &args_cnt);
>
> Move that args splitting...
>
> > +
> > +     /* Check ecc enabled */
> > +     if (!(readl(priv->reg + npcm_chip->ecc_ctl_en_reg) & npcm_chip->ecc_ctl_ecc_enable_mask))
> > +             return count;
> > +
> > +     /* Check no write operation pending to controller*/
> > +     while (readl(priv->reg + npcm_chip->ddr_ctl_controller_busy_reg) &
> > +                     CTL_CONTROLLER_BUSY_FLAG) {
> > +             usleep_range(1000, 10000);
> > +     }
>
> ... here.
>

OK


> > +
> > +     /* Write appropriate syndrome to xor_check_bit*/
>
> Any documentation about the string being written to debugfs here? I
> wouldn't want to read the source each time :)
>
> > +     if (!strcmp(args[0], "CE") && args_cnt == 3) {
> > +             ret = kstrtou8(args[2], 0, &bit_no);
> > +             if (ret)
> > +                     return ret;
> > +             if (!strcmp(args[1], "checkcode")) {
> > +                     if (bit_no > 7) {
> > +                             edac_printk(KERN_INFO, NPCM_EDAC_MOD_NAME, "bit_no for checkcode must be 0~7\n");
> > +                             return count;
> > +                     }
> > +                     regval = readl(priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
> > +                     regval = (regval & ~(NPCM_ECC_CTL_XOR_BITS_MASK)) |
> > +                             (check_synd[bit_no] << XOR_CHECK_BIT_SPLIT_WIDTH);
> > +                     writel(regval, priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
> > +             } else if (!strcmp(args[1], "data")) {
> > +                     if (bit_no > 63) {
> > +                             edac_printk(KERN_INFO, NPCM_EDAC_MOD_NAME, "bit_no for data must be 0~63\n");
> > +                             return count;
> > +                     }
> > +                     regval = readl(priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
> > +                     regval = (regval & ~(NPCM_ECC_CTL_XOR_BITS_MASK)) |
> > +                                      (data_synd[bit_no] << XOR_CHECK_BIT_SPLIT_WIDTH);
> > +                     writel(regval, priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
> > +             }
> > +             /* Enable the ECC writeback_en for corrected error */
> > +             regval = readl(priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
> > +             writel((regval | NPCM_ECC_CTL_AUTO_WRITEBACK_EN),
> > +                    priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
> > +     } else if (!strcmp(args[0], "UE")) {
> > +             regval = readl(priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
> > +             regval = (regval & ~(NPCM_ECC_CTL_XOR_BITS_MASK)) |
> > +                              (ECC_DOUBLE_MULTI_ERR_SYND << XOR_CHECK_BIT_SPLIT_WIDTH);
> > +             writel(regval, priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
> > +     }
> > +
> > +     /* Assert fwc */
> > +     writel((NPCM_ECC_CTL_FORCE_WC | readl(priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg)),
> > +            priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
> > +
> > +     return count;
> > +}
>
> ...
>
> > +#ifdef CONFIG_EDAC_DEBUG
> > +     if ((npcm_chip->ip_features & FORCED_ECC_ERR_EVENT_SUPPORT) &&
> > +         npcm_chip->chip == NPCM8XX_CHIP) {
> > +             if (create_sysfs_attributes(mci)) {
> > +                     edac_printk(KERN_ERR, NPCM_EDAC_MOD_NAME,
> > +                                 "Failed to create sysfs entries\n");
> > +                     goto err1;
> > +             }
> > +     }
> > +#endif
> > +
> > +     /* Only enable MC interrupts with ECC - clear global int mask bit and ecc bit */
> > +     writel(npcm_chip->ecc_ctl_en_int_master_mask,
> > +            priv_data->reg + npcm_chip->ecc_ctl_int_mask_master);
> > +
> > +     if (npcm_chip->chip == NPCM8XX_CHIP) {
> > +             /* clear single and multi for ce and ue */
> > +             writel(npcm_chip->ecc_ctl_en_int_ecc_mask,
> > +                    priv_data->reg + npcm_chip->ecc_ctl_int_mask_ecc);
> > +     }
> > +
> > +     return 0;
> > +
> > +#ifdef CONFIG_EDAC_DEBUG
> > +err1:
> > +#endif
>
> This is just silly. Why should loading of the driver fail when it cannot
> create a couple of sysfs debugging helpers? I think you're fine if you
> simply issue the error message but continue.

I will revise it

>
> > +
> > +     edac_mc_del_mc(&pdev->dev);
> > +
> > +err:
> > +     edac_mc_free(mci);
> > +     return ret;
> > +}
> > +
> > +static int npcm_edac_mc_remove(struct platform_device *pdev)
> > +{
> > +     struct mem_ctl_info *mci = platform_get_drvdata(pdev);
> > +     struct priv_data *priv = mci->pvt_info;
> > +     const struct npcm_edac_platform_data *npcm_chip = priv->npcm_chip;
> > +
> > +     writel(NPCM_ECC_CTL_GLOBAL_INT_DISABLE, priv->reg + npcm_chip->ecc_ctl_int_mask_master);
> > +
> > +     /* Disable ecc feature before removing driver by writing 0 */
> > +     writel((unsigned int)(~(npcm_chip->ecc_ctl_ecc_enable_mask)),
> > +            priv->reg + npcm_chip->ecc_ctl_en_reg);
> > +
> > +#ifdef CONFIG_EDAC_DEBUG
> > +     remove_sysfs_attributes(mci);
> > +#endif
> > +     edac_mc_del_mc(&pdev->dev);
> > +     edac_mc_free(mci);
> > +
> > +     return 0;
> > +}
> > +
> > +static struct platform_driver npcm_edac_mc_driver = {
> > +     .driver = {
> > +                .name = "npcm-edac",
> > +                .of_match_table = npcm_edac_of_match,
> > +     },
> > +     .probe = npcm_edac_mc_probe,
> > +     .remove = npcm_edac_mc_remove,
> > +};
> > +
> > +module_platform_driver(npcm_edac_mc_driver);
> > +
> > +MODULE_AUTHOR("Medad <ctcchien@nuvoton.com>");
>                         ^^
>
> Your surname too pls.
>

Got it

> > +MODULE_DESCRIPTION("Nuvoton NPCM EDAC Driver");
> > +MODULE_LICENSE("GPL v2");
> > --
> > 2.17.1
> >
>
> --
> Regards/Gruss,
>     Boris.
>
> https://people.kernel.org/tglx/notes-about-netiquette

Re: [PATCH v6 3/3] EDAC: nuvoton: Add NPCM memory controller driver

[Paul Menzel]

Dear Medad,


Am 22.03.22 um 04:01 schrieb Medad CChien:
> Add support for Nuvoton NPCM SoC.

Please also mention *memory controller* here.

Please also mention the datasheet name, revision, and section here.

> Signed-off-by: Medad CChien <ctcchien@nuvoton.com>
> 
> Reported-by: kernel test robot <lkp@intel.com>
> 
> All errors (new ones prefixed by >>):

[…]

Hmm, you add new code here, right? Is that report for an earlier patch 
version? Please make that more clear.

[…]

On what device did you test it? Maybe paste the new log messages, and 
also give an example how to force an ECC error, so it’s easy to test, if 
the driver works.

> ---
>   drivers/edac/Kconfig     |   9 +
>   drivers/edac/Makefile    |   1 +
>   drivers/edac/npcm_edac.c | 706 +++++++++++++++++++++++++++++++++++++++
>   3 files changed, 716 insertions(+)
>   create mode 100644 drivers/edac/npcm_edac.c
> 
> diff --git a/drivers/edac/Kconfig b/drivers/edac/Kconfig
> index 58ab63642e72..bdca55fa6022 100644
> --- a/drivers/edac/Kconfig
> +++ b/drivers/edac/Kconfig
> @@ -539,4 +539,13 @@ config EDAC_DMC520
>   	  Support for error detection and correction on the
>   	  SoCs with ARM DMC-520 DRAM controller.
>   
> +config EDAC_NPCM
> +	tristate "Nuvoton NPCM DDR Memory Controller"
> +	depends on (ARCH_NPCM || COMPILE_TEST)
> +	help
> +	  Support for error detection and correction on the
> +	  Nuvoton NPCM DDR memory controller.

Some words fit on the line above.

> +	  First, ECC must be configured in the BootBlock header. Then, this driver

Again, *bootblock* does not seem to be a common term in the Linux 
kernel. Did you meant bootloader?

> +	  will expose error counters via the EDAC kernel framework.
> +
>   endif # EDAC
> diff --git a/drivers/edac/Makefile b/drivers/edac/Makefile
> index 2d1641a27a28..db3c59d3ad84 100644
> --- a/drivers/edac/Makefile
> +++ b/drivers/edac/Makefile
> @@ -84,3 +84,4 @@ obj-$(CONFIG_EDAC_QCOM)			+= qcom_edac.o
>   obj-$(CONFIG_EDAC_ASPEED)		+= aspeed_edac.o
>   obj-$(CONFIG_EDAC_BLUEFIELD)		+= bluefield_edac.o
>   obj-$(CONFIG_EDAC_DMC520)		+= dmc520_edac.o
> +obj-$(CONFIG_EDAC_NPCM)			+= npcm_edac.o
> diff --git a/drivers/edac/npcm_edac.c b/drivers/edac/npcm_edac.c
> new file mode 100644
> index 000000000000..9dd05bec0b7f
> --- /dev/null
> +++ b/drivers/edac/npcm_edac.c
> @@ -0,0 +1,706 @@
> +// SPDX-License-Identifier: GPL-2.0
> +// Copyright (c) 2022 Nuvoton Technology corporation.

Dot/period at the end not needed.

> +
> +#include <linux/delay.h>
> +#include <linux/of_device.h>
> +
> +#include "edac_module.h"
> +
> +#define NPCM_EDAC_MOD_NAME "npcm-edac"
> +#define FORCED_ECC_ERR_EVENT_SUPPORT	BIT(1)
> +#define EDAC_MSG_SIZE                  256
> +/* Granularity of reported error in bytes */
> +#define NPCM_EDAC_ERR_GRAIN		1
> +
> +#define MEM_TYPE_DDR4			0xA
> +
> +#define NPCM8XX_CHIP			0x800
> +#define NPCM7XX_CHIP			0x700

Sort other way around?

> +
> +/* Control register width definitions */
> +#define WDTH_16				(2)
> +#define WDTH_32				(1)
> +#define WDTH_64				(0)
> +#define CTL_MEM_MAX_WIDTH_MASK		GENMASK(4, 0)
> +#define CTL_REG_WIDTH_SHIFT		(32)
> +#define XOR_CHECK_BIT_SPLIT_WIDTH		(16)
> +#define CTL_CONTROLLER_BUSY_FLAG	BIT(0)
> +#define NPCM_ECC_CTL_FORCE_WC		BIT(8)
> +#define NPCM_ECC_CTL_AUTO_WRITEBACK_EN	BIT(24)
> +#define NPCM_ECC_CTL_XOR_BITS_MASK		GENMASK(23, 16)
> +#define NPCM_ECC_CTL_MTYPE_MASK			GENMASK(11, 8)
> +#define NPCM_ECC_CTL_GLOBAL_INT_DISABLE	BIT(31)
> +
> +#ifdef CONFIG_EDAC_DEBUG

Instead of doing this in the preprocessor, can you always define the 
values, and in the code, do all the checks in C code?

     if IS_ENABLED(CONFIG_EDAC_DEBUG)

> +
> +/* Syndrome values */
> +#define ECC_DOUBLE_MULTI_ERR_SYND	0x03
> +
> +static char data_synd[] = {
> +			0xf4, 0xf1, 0xec, 0xea, 0xe9, 0xe6, 0xe5, 0xe3,
> +			0xdc, 0xda, 0xd9, 0xd6, 0xd5, 0xd3, 0xce, 0xcb,
> +			0xb5, 0xb0, 0xad, 0xab, 0xa8, 0xa7, 0xa4, 0xa2,
> +			0x9d, 0x9b, 0x98, 0x97, 0x94, 0x92, 0x8f, 0x8a,
> +			0x75, 0x70, 0x6d, 0x6b, 0x68, 0x67, 0x64, 0x62,
> +			0x5e, 0x5b, 0x58, 0x57, 0x54, 0x52, 0x4f, 0x4a,
> +			0x34, 0x31, 0x2c, 0x2a, 0x29, 0x26, 0x25, 0x23,
> +			0x1c, 0x1a, 0x19, 0x16, 0x15, 0x13, 0x0e, 0x0b
> +		  };
> +
> +static char check_synd[] = {0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80};
> +#endif
> +
> +struct npcm_edac_platform_data {
> +	/* force ECC event */
> +	u32 ip_features;
> +	u32 ddr_ctl_controller_busy_reg;
> +	u32 ecc_ctl_xor_check_bits_reg;
> +
> +	u32 chip;
> +
> +	/* DDR4 Controller Registers */
> +	u32 ddr_ctl_mem_type_reg;
> +	u32 ddr_ctl_mem_width_reg;
> +
> +	u32 ecc_ctl_en_reg;
> +	u32 ecc_ctl_int_mask;
> +	u32 ecc_ctl_int_status;
> +	u32 ecc_ctl_int_ack;
> +	u32 ecc_ctl_int_mask_master;
> +	u32 ecc_ctl_int_mask_ecc;
> +
> +	u32 ecc_sig_ecc_c_addr_l;
> +	u32 ecc_sig_ecc_c_addr_h;
> +	u32 ecc_sig_ecc_c_data_l;
> +	u32 ecc_sig_ecc_c_data_h;
> +	u32 ecc_sig_ecc_c_id;
> +	u32 ecc_sig_ecc_c_synd;
> +
> +	u32 ecc_sig_ecc_u_addr_l;
> +	u32 ecc_sig_ecc_u_addr_h;
> +	u32 ecc_sig_ecc_u_data_l;
> +	u32 ecc_sig_ecc_u_data_h;
> +	u32 ecc_sig_ecc_u_id;
> +	u32 ecc_sig_ecc_u_synd;
> +
> +	/* MASK */
> +	u32 ecc_ctl_ecc_enable_mask;
> +	u32 ecc_ctl_en_int_master_mask;
> +	u32 ecc_ctl_en_int_ecc_mask;
> +
> +	/* ECC IRQ Macros */
> +	u32 ecc_int_ce_event;
> +	u32 ecc_int_second_ce_event;
> +	u32 ecc_int_ue_event;
> +	u32 ecc_int_second_ue_event;
> +	u32 ecc_int_ce_ue_mask;
> +	u32 ecc_ce_intr_mask;
> +	u32 ecc_ue_intr_mask;
> +
> +	/* ECC Signature Macros */
> +	u32 ecc_sig_ecc_c_id_shift;
> +	u32 ecc_sig_ecc_c_synd_shift;
> +	u32 ecc_sig_ecc_c_addr_h_mask;
> +	u32 ecc_sig_ecc_c_id_mask;
> +	u32 ecc_sig_ecc_c_synd_mask;
> +
> +	u32 ecc_sig_ecc_u_id_shift;
> +	u32 ecc_sig_ecc_u_synd_shift;
> +	u32 ecc_sig_ecc_u_addr_h_mask;
> +	u32 ecc_sig_ecc_u_id_mask;
> +	u32 ecc_sig_ecc_u_synd_mask;
> +};
> +
> +struct priv_data {
> +	void __iomem *reg;
> +	u32 ce_cnt;
> +	u32 ue_cnt;
> +	char message[EDAC_MSG_SIZE];
> +	const struct npcm_edac_platform_data *npcm_chip;
> +};
> +
> +#ifdef CONFIG_EDAC_DEBUG
> +static void init_mem_layout(struct mem_ctl_info *mci)
> +{
> +	struct priv_data *priv = mci->pvt_info;
> +	const struct npcm_edac_platform_data *npcm_chip = priv->npcm_chip;
> +	struct csrow_info *csi;
> +	struct dimm_info *dimm;
> +	struct sysinfo inf;

Maybe name it at least info, so it can’t be confused with infinity.

> +	enum mem_type mtype;
> +	u32 val, width;
> +	u32 size, row;

Please use native types, for example `unsigned long` for `size`.

> +	u8 j;

Ditto. For smaller data types than the native type, the compiler 
actually needs to create more instructions.

> +
> +	dimm = edac_get_dimm(mci, 0, 0, 0);
> +	if (!dimm) {
> +		si_meminfo(&inf);
> +		for (row = 0; row < mci->nr_csrows; row++) {
> +			csi = mci->csrows[row];
> +			size = inf.totalram * inf.mem_unit;

Can be moved outside the loop?

> +
> +			for (j = 0; j < csi->nr_channels; j++) {
> +				dimm            = csi->channels[j]->dimm;
> +				dimm->edac_mode = EDAC_FLAG_SECDED;
> +				/* Get memory type by reading hw registers*/
> +				val = readl(priv->reg + npcm_chip->ddr_ctl_mem_type_reg);
> +				mtype = val & NPCM_ECC_CTL_MTYPE_MASK;
> +
> +				if (mtype == MEM_TYPE_DDR4)
> +					dimm->mtype = MEM_DDR4;
> +				else
> +					dimm->mtype = MEM_EMPTY;

Use ternary operator?

     dimm-mtype = (mtype == MEM_TYPE_DDR4) ? MEM_DDR4 : MEM_EMPTY;

> +
> +				/*Get EDAC devtype width for the current mc*/
> +				width = readl(priv->reg + npcm_chip->ddr_ctl_mem_width_reg)
> +					      & CTL_MEM_MAX_WIDTH_MASK;
> +				switch (width) {
> +				case WDTH_16:
> +					dimm->dtype  = DEV_X2;

Just one space before =.

> +					break;
> +				case WDTH_32:
> +					dimm->dtype  = DEV_X4;
> +					break;
> +				case WDTH_64:
> +					dimm->dtype  = DEV_X8;
> +					break;
> +				default:
> +					dimm->dtype = DEV_UNKNOWN;
> +				}
> +
> +				dimm->nr_pages  = (size >> PAGE_SHIFT) /
> +					csi->nr_channels;
> +				dimm->grain     = NPCM_EDAC_ERR_GRAIN;
> +			}
> +		}
> +	}
> +}
> +#endif
> +
> +static void handle_ce(struct mem_ctl_info *mci)

The function is not called often, so use `handle_correctable_error()`?

> +{
> +	struct priv_data *priv = mci->pvt_info;
> +	const struct npcm_edac_platform_data *npcm_chip = priv->npcm_chip;
> +	u64 err_c_addr = 0x0;

size_t

> +	u64 err_c_data = 0x0;
> +	u32 err_c_synd, err_c_id;
> +	u32 sig_val_l, sig_val_h;
> +
> +	sig_val_l = readl(priv->reg + npcm_chip->ecc_sig_ecc_c_addr_l);
> +
> +	if (npcm_chip->chip == NPCM8XX_CHIP)
> +		sig_val_h = (readl(priv->reg + npcm_chip->ecc_sig_ecc_c_addr_h) &
> +				npcm_chip->ecc_sig_ecc_c_addr_h_mask);
> +	else
> +		sig_val_h = 0x0;
> +
> +	err_c_addr = (((err_c_addr | sig_val_h) <<
> +				CTL_REG_WIDTH_SHIFT) | sig_val_l);
> +
> +	sig_val_l = readl(priv->reg + npcm_chip->ecc_sig_ecc_c_data_l);
> +
> +	if (npcm_chip->chip == NPCM8XX_CHIP)
> +		sig_val_h = readl(priv->reg + npcm_chip->ecc_sig_ecc_c_data_h);
> +	else
> +		sig_val_h = 0x0;
> +
> +	err_c_data = (((err_c_data | sig_val_h) <<
> +				CTL_REG_WIDTH_SHIFT) | sig_val_l);
> +
> +	err_c_id = ((readl(priv->reg + npcm_chip->ecc_sig_ecc_c_id) &
> +				npcm_chip->ecc_sig_ecc_c_id_mask) >>
> +				npcm_chip->ecc_sig_ecc_c_id_shift);
> +
> +	err_c_synd = ((readl(priv->reg + npcm_chip->ecc_sig_ecc_c_synd) &
> +				npcm_chip->ecc_sig_ecc_c_synd_mask) >>
> +				npcm_chip->ecc_sig_ecc_c_synd_shift);
> +
> +	priv->ce_cnt = priv->ce_cnt + 1;

Ditto.

> +
> +	snprintf(priv->message,
> +		 EDAC_MSG_SIZE, "DDR ECC %s: data=0x%llx source_id=%#08x",
> +		 mci->ctl_name, err_c_data, err_c_id);
> +
> +	edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci,
> +			     1,
> +			     err_c_addr >> PAGE_SHIFT,
> +			     err_c_addr & ~PAGE_MASK,
> +			     err_c_synd, 0, 0, -1,
> +			     priv->message, "");
> +}
> +
> +static void handle_ue(struct mem_ctl_info *mci)
> +{
> +	struct priv_data *priv = mci->pvt_info;
> +	const struct npcm_edac_platform_data *npcm_chip = priv->npcm_chip;
> +	u64 err_u_addr = 0x0;

Why not size_t? No initialization needed?

> +	u64 err_u_data = 0x0;
> +	u32 err_u_synd, err_u_id;
> +	u32 sig_val_l, sig_val_h;
> +
> +	sig_val_l = readl(priv->reg + npcm_chip->ecc_sig_ecc_u_addr_l);
> +
> +	if (npcm_chip->chip == NPCM8XX_CHIP)
> +		sig_val_h = (readl(priv->reg + npcm_chip->ecc_sig_ecc_u_addr_h) &
> +				npcm_chip->ecc_sig_ecc_u_addr_h_mask);
> +	else
> +		sig_val_h = 0x0;
> +
> +	err_u_addr = (((err_u_addr | sig_val_h) <<
> +				CTL_REG_WIDTH_SHIFT) | sig_val_l);
> +
> +	sig_val_l = readl(priv->reg + npcm_chip->ecc_sig_ecc_u_data_l);
> +
> +	if (npcm_chip->chip == NPCM8XX_CHIP)
> +		sig_val_h = readl(priv->reg + npcm_chip->ecc_sig_ecc_u_data_h);
> +	else
> +		sig_val_h = 0x0;
> +
> +	err_u_data = (((err_u_data | sig_val_h) <<
> +				CTL_REG_WIDTH_SHIFT) | sig_val_l);
> +
> +	err_u_id = ((readl(priv->reg + npcm_chip->ecc_sig_ecc_u_id) &
> +				npcm_chip->ecc_sig_ecc_u_id_mask) >>
> +			npcm_chip->ecc_sig_ecc_u_id_shift);
> +
> +	err_u_synd = ((readl(priv->reg + npcm_chip->ecc_sig_ecc_u_synd) &
> +				npcm_chip->ecc_sig_ecc_u_synd_mask) >>
> +			npcm_chip->ecc_sig_ecc_u_synd_shift);
> +	priv->ue_cnt = priv->ue_cnt + 1;

priv->ue_cnt += 1

> +
> +	snprintf(priv->message, EDAC_MSG_SIZE,
> +		 "DDR ECC %s: addr=0x%llx data=0x%llx source_id=%#08x",
> +		 mci->ctl_name, err_u_addr, err_u_data, err_u_id);
> +
> +	edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci,
> +			     1,
> +			     err_u_addr >> PAGE_SHIFT,
> +			     err_u_addr & ~PAGE_MASK,
> +			     err_u_synd, 0, 0, -1,
> +			     priv->message, "");
> +}
> +
> +static irqreturn_t edac_ecc_isr(int irq, void *dev_id)
> +{
> +	struct mem_ctl_info *mci = dev_id;
> +	struct priv_data *priv = mci->pvt_info;
> +	const struct npcm_edac_platform_data *npcm_chip = priv->npcm_chip;
> +	u32 intr_status;
> +	u32 val;
> +
> +	/* Check the intr status and confirm ECC error intr */
> +	intr_status = readl(priv->reg + npcm_chip->ecc_ctl_int_status);
> +
> +	edac_dbg(3, "InterruptStatus : 0x%x\n", intr_status);

Remove the space before the colon? Maybe use:

"Interrupt status (intr_status): 0x%x\n"

> +	val = intr_status & npcm_chip->ecc_int_ce_ue_mask;
> +	if (!((val & npcm_chip->ecc_ce_intr_mask) || (val & npcm_chip->ecc_ue_intr_mask)))
> +		return IRQ_NONE;
> +
> +	if (val & npcm_chip->ecc_ce_intr_mask) {
> +		handle_ce(mci);
> +
> +		/* Clear the interrupt source */
> +		if (val & npcm_chip->ecc_int_ce_event)
> +			writel(npcm_chip->ecc_int_ce_event, priv->reg + npcm_chip->ecc_ctl_int_ack);
> +		else if (val & npcm_chip->ecc_int_second_ce_event)
> +			writel(npcm_chip->ecc_int_second_ce_event,
> +			       priv->reg + npcm_chip->ecc_ctl_int_ack);
> +		else
> +			edac_printk(KERN_ERR, NPCM_EDAC_MOD_NAME, "Failed to clear IRQ\n");

Mention the interrupt too?

> +	}
> +
> +	if (val & npcm_chip->ecc_ue_intr_mask) {
> +		handle_ue(mci);
> +
> +		/* Clear the interrupt source */
> +		if (val & npcm_chip->ecc_int_ue_event)
> +			writel(npcm_chip->ecc_int_ue_event, priv->reg + npcm_chip->ecc_ctl_int_ack);
> +		else if (val & npcm_chip->ecc_int_second_ue_event)
> +			writel(npcm_chip->ecc_int_second_ue_event,
> +			       priv->reg + npcm_chip->ecc_ctl_int_ack);
> +		else
> +			edac_printk(KERN_ERR, NPCM_EDAC_MOD_NAME, "Failed to clear IRQ\n");
> +	}
> +
> +	edac_dbg(3, "Total error count CE %d UE %d\n",
> +		 priv->ce_cnt, priv->ue_cnt);
> +
> +	return IRQ_HANDLED;
> +}
> +
> +#ifdef CONFIG_EDAC_DEBUG
> +
> +static ssize_t forced_ecc_error_show(struct device *dev,
> +				     struct device_attribute *mattr,
> +				     char *data)
> +{
> +	return sprintf(data, "CDNS-DDR4 Force Injection Help:\n"
> +		       "CE: Corrected\n"
> +		       "checkcode/data:source\n"
> +		       "bit [0-63] for data [0-7] for checkcode:bit number\n"
> +		       "--------------------------------------------------\n"
> +		       "UE: Uncorrected\n");
> +}
> +
> +static ssize_t forced_ecc_error_store(struct device *dev,
> +				      struct device_attribute *mattr,
> +				      const char *data, size_t count)
> +{
> +	struct mem_ctl_info *mci = to_mci(dev);
> +	struct priv_data *priv = mci->pvt_info;
> +	const struct npcm_edac_platform_data *npcm_chip = priv->npcm_chip;
> +	int	args_cnt;

unsigned int?

> +	int	ret;
> +	char	**args;
> +	u32	regval;
> +	u8	bit_no;

Please use native types.

> +
> +	/* Split string buffer into separate parameters */
> +	args = argv_split(GFP_KERNEL, data, &args_cnt);
> +
> +	/* Check ecc enabled */
> +	if (!(readl(priv->reg + npcm_chip->ecc_ctl_en_reg) & npcm_chip->ecc_ctl_ecc_enable_mask))
> +		return count;
> +
> +	/* Check no write operation pending to controller*/

Missing space before the comment terminator `*/`. Also in several other 
places.

> +	while (readl(priv->reg + npcm_chip->ddr_ctl_controller_busy_reg) &
> +			CTL_CONTROLLER_BUSY_FLAG) {
> +		usleep_range(1000, 10000);
> +	}
> +
> +	/* Write appropriate syndrome to xor_check_bit*/
> +	if (!strcmp(args[0], "CE") && args_cnt == 3) {
> +		ret = kstrtou8(args[2], 0, &bit_no);
> +		if (ret)
> +			return ret;
> +		if (!strcmp(args[1], "checkcode")) {
> +			if (bit_no > 7) {
> +				edac_printk(KERN_INFO, NPCM_EDAC_MOD_NAME, "bit_no for checkcode must be 0~7\n");
> +				return count;
> +			}
> +			regval = readl(priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
> +			regval = (regval & ~(NPCM_ECC_CTL_XOR_BITS_MASK)) |
> +				(check_synd[bit_no] << XOR_CHECK_BIT_SPLIT_WIDTH);
> +			writel(regval, priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
> +		} else if (!strcmp(args[1], "data")) {
> +			if (bit_no > 63) {
> +				edac_printk(KERN_INFO, NPCM_EDAC_MOD_NAME, "bit_no for data must be 0~63\n");
> +				return count;
> +			}
> +			regval = readl(priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
> +			regval = (regval & ~(NPCM_ECC_CTL_XOR_BITS_MASK)) |
> +					 (data_synd[bit_no] << XOR_CHECK_BIT_SPLIT_WIDTH);
> +			writel(regval, priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
> +		}
> +		/* Enable the ECC writeback_en for corrected error */
> +		regval = readl(priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
> +		writel((regval | NPCM_ECC_CTL_AUTO_WRITEBACK_EN),
> +		       priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
> +	} else if (!strcmp(args[0], "UE")) {
> +		regval = readl(priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
> +		regval = (regval & ~(NPCM_ECC_CTL_XOR_BITS_MASK)) |
> +				 (ECC_DOUBLE_MULTI_ERR_SYND << XOR_CHECK_BIT_SPLIT_WIDTH);
> +		writel(regval, priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
> +	}
> +
> +	/* Assert fwc */
> +	writel((NPCM_ECC_CTL_FORCE_WC | readl(priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg)),
> +	       priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
> +
> +	return count;
> +}
> +
> +static DEVICE_ATTR_RW(forced_ecc_error);
> +static int create_sysfs_attributes(struct mem_ctl_info *mci)
> +{
> +	int rc;
> +
> +	rc = device_create_file(&mci->dev, &dev_attr_forced_ecc_error);
> +	if (rc < 0)
> +		return rc;
> +	return 0;
> +}
> +
> +static void remove_sysfs_attributes(struct mem_ctl_info *mci)
> +{
> +	device_remove_file(&mci->dev, &dev_attr_forced_ecc_error);
> +}
> +
> +#endif
> +
> +static const struct npcm_edac_platform_data npcm7xx_edac = {
> +	.chip = NPCM7XX_CHIP,
> +
> +	/* CDNS DDR4 Controller Registers */
> +	.ecc_ctl_en_reg = 0x174,
> +	.ecc_ctl_int_status = 0x1D0,
> +	.ecc_ctl_int_ack = 0x1D4,
> +	.ecc_ctl_int_mask_master = 0x1D8,
> +
> +	.ecc_sig_ecc_c_addr_l = 0x188,
> +	.ecc_sig_ecc_c_data_l = 0x190,
> +	.ecc_sig_ecc_c_id = 0x194,
> +	.ecc_sig_ecc_c_synd = 0x18C,
> +
> +	.ecc_sig_ecc_u_addr_l = 0x17C,
> +	.ecc_sig_ecc_u_data_l = 0x184,
> +	.ecc_sig_ecc_u_id = 0x194,
> +	.ecc_sig_ecc_u_synd = 0x180,
> +
> +	/* MASK */
> +	.ecc_ctl_ecc_enable_mask = BIT(24),
> +	.ecc_ctl_en_int_master_mask = GENMASK(30, 7) | GENMASK(2, 0),
> +
> +	/* ECC IRQ Macros */
> +	.ecc_int_ce_event = BIT(3),
> +	.ecc_int_second_ce_event = BIT(4),
> +	.ecc_int_ue_event = BIT(5),
> +	.ecc_int_second_ue_event = BIT(6),
> +	.ecc_int_ce_ue_mask = GENMASK(6, 3),
> +	.ecc_ce_intr_mask = GENMASK(4, 3),
> +	.ecc_ue_intr_mask = GENMASK(6, 5),
> +
> +	/* ECC Signature Macros */
> +	.ecc_sig_ecc_c_id_shift = 16,
> +	.ecc_sig_ecc_c_synd_shift = 0,
> +
> +	.ecc_sig_ecc_c_id_mask = GENMASK(29, 16),
> +	.ecc_sig_ecc_c_synd_mask = GENMASK(6, 0),
> +
> +	.ecc_sig_ecc_u_id_shift = 0,
> +	.ecc_sig_ecc_u_synd_shift = 0,
> +
> +	.ecc_sig_ecc_u_id_mask = GENMASK(13, 0),
> +	.ecc_sig_ecc_u_synd_mask = GENMASK(6, 0),
> +};
> +
> +static const struct npcm_edac_platform_data npcm8xx_edac = {
> +#ifdef CONFIG_EDAC_DEBUG
> +	.ip_features = FORCED_ECC_ERR_EVENT_SUPPORT,
> +	.ddr_ctl_controller_busy_reg = 0x20C,
> +	.ecc_ctl_xor_check_bits_reg = 0x174,
> +#endif
> +
> +	.chip = NPCM8XX_CHIP,
> +
> +	/* CDNS DDR4 Controller Registers */
> +	.ddr_ctl_mem_type_reg = 0x000,
> +	.ddr_ctl_mem_width_reg = 0x00c,
> +
> +	.ecc_ctl_en_reg = 0x16C,
> +	.ecc_ctl_int_status = 0x228,
> +	.ecc_ctl_int_ack = 0x244,
> +	.ecc_ctl_int_mask_master = 0x220,
> +	.ecc_ctl_int_mask_ecc = 0x260,
> +
> +	.ecc_sig_ecc_c_addr_l = 0x18C,
> +	.ecc_sig_ecc_c_addr_h = 0x190,
> +	.ecc_sig_ecc_c_data_l = 0x194,
> +	.ecc_sig_ecc_c_data_h = 0x198,
> +	.ecc_sig_ecc_c_id = 0x19C,
> +	.ecc_sig_ecc_c_synd = 0x190,
> +
> +	.ecc_sig_ecc_u_addr_l = 0x17C,
> +	.ecc_sig_ecc_u_addr_h = 0x180,
> +	.ecc_sig_ecc_u_data_l = 0x184,
> +	.ecc_sig_ecc_u_data_h = 0x188,
> +	.ecc_sig_ecc_u_id = 0x19C,
> +	.ecc_sig_ecc_u_synd = 0x180,
> +
> +	/* MASK */
> +	.ecc_ctl_ecc_enable_mask = GENMASK(17, 16),
> +	.ecc_ctl_en_int_master_mask = GENMASK(30, 3) | GENMASK(1, 0),
> +	.ecc_ctl_en_int_ecc_mask = GENMASK(8, 4),
> +
> +	/* ECC IRQ Macros */
> +	.ecc_int_ce_event = BIT(0),
> +	.ecc_int_second_ce_event = BIT(1),
> +	.ecc_int_ue_event = BIT(2),
> +	.ecc_int_second_ue_event = BIT(3),
> +	.ecc_int_ce_ue_mask = GENMASK(3, 0),
> +	.ecc_ce_intr_mask = GENMASK(1, 0),
> +	.ecc_ue_intr_mask = GENMASK(3, 2),
> +
> +	/* ECC Signature Macros */
> +	.ecc_sig_ecc_c_id_shift = 8,
> +	.ecc_sig_ecc_c_synd_shift = 8,
> +	.ecc_sig_ecc_c_addr_h_mask = GENMASK(1, 0),
> +	.ecc_sig_ecc_c_id_mask = GENMASK(29, 16),
> +	.ecc_sig_ecc_c_synd_mask = GENMASK(15, 8),
> +
> +	.ecc_sig_ecc_u_id_shift = 0,
> +	.ecc_sig_ecc_u_synd_shift = 8,
> +	.ecc_sig_ecc_u_addr_h_mask = GENMASK(1, 0),
> +	.ecc_sig_ecc_u_id_mask = GENMASK(13, 0),
> +	.ecc_sig_ecc_u_synd_mask = GENMASK(15, 8),
> +};
> +
> +static const struct of_device_id npcm_edac_of_match[] = {
> +	{ .compatible = "nuvoton,npcm845-memory-controller", .data = &npcm8xx_edac },
> +	{ .compatible = "nuvoton,npcm750-memory-controller", .data = &npcm7xx_edac },

Sort this the other way?

> +	{},
> +};
> +
> +MODULE_DEVICE_TABLE(of, npcm_edac_of_match);
> +
> +static int npcm_edac_mc_probe(struct platform_device *pdev)
> +{
> +	const struct npcm_edac_platform_data *npcm_chip;
> +	struct device *dev = &pdev->dev;
> +	struct edac_mc_layer layers[1];
> +	const struct of_device_id *id;
> +	struct priv_data *priv_data;
> +	struct mem_ctl_info *mci;
> +	struct resource *res;
> +	void __iomem *reg;
> +	int ret = -ENODEV;
> +	int irq;
> +	u32 ecc_en;
> +
> +	id = of_match_device(npcm_edac_of_match, &pdev->dev);
> +
> +	npcm_chip = of_device_get_match_data(&pdev->dev);
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	reg = devm_ioremap_resource(dev, res);
> +	if (IS_ERR(reg)) {
> +		edac_printk(KERN_ERR, NPCM_EDAC_MOD_NAME,
> +			    "cdns DDR4 mc regs are not defined\n");
> +		return PTR_ERR(reg);
> +	}
> +
> +	ecc_en = readl(reg + npcm_chip->ecc_ctl_en_reg);
> +
> +	if ((ecc_en & npcm_chip->ecc_ctl_ecc_enable_mask) == npcm_chip->ecc_ctl_ecc_enable_mask) {
> +		edac_printk(KERN_INFO, NPCM_EDAC_MOD_NAME, "ECC reporting and correcting on. ");
> +	} else {
> +		edac_printk(KERN_INFO, NPCM_EDAC_MOD_NAME, "ECC disabled\n");
> +		return -ENXIO;
> +	}
> +
> +	edac_printk(KERN_INFO, NPCM_EDAC_MOD_NAME,
> +		    "IO mapped reg addr: %p\n", reg);

Fits on the line above? Also in several other places.

> +	layers[0].type = EDAC_MC_LAYER_ALL_MEM;
> +	layers[0].size = 1;
> +
> +	mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers,
> +			    sizeof(struct priv_data));
> +	if (!mci) {
> +		edac_printk(KERN_ERR, NPCM_EDAC_MOD_NAME,
> +			    "Failed memory allocation for mc instance\n");
> +		return -ENOMEM;
> +	}
> +	mci->pdev = &pdev->dev;
> +	priv_data = mci->pvt_info;
> +	priv_data->reg = reg;
> +	priv_data->npcm_chip = npcm_chip;
> +	priv_data->ce_cnt = 0;
> +	priv_data->ue_cnt = 0;
> +	platform_set_drvdata(pdev, mci);
> +
> +	/* Initialize controller capabilities */
> +	mci->mtype_cap = MEM_FLAG_DDR4;
> +	mci->edac_ctl_cap = EDAC_FLAG_SECDED;
> +	mci->scrub_cap = SCRUB_FLAG_HW_SRC;
> +	mci->scrub_mode = SCRUB_HW_SRC;
> +	mci->edac_cap = EDAC_FLAG_SECDED;
> +	mci->ctl_name = id->compatible;
> +	mci->dev_name = dev_name(&pdev->dev);
> +	mci->mod_name = NPCM_EDAC_MOD_NAME;
> +	mci->ctl_page_to_phys = NULL;
> +
> +	/* Interrupt feature is supported by cadence mc */
> +	edac_op_state = EDAC_OPSTATE_INT;
> +#ifdef CONFIG_EDAC_DEBUG
> +	init_mem_layout(mci);
> +#endif
> +	/* Setup Interrupt handler for ECC */

Set up

> +	irq = platform_get_irq(pdev, 0);
> +	if (!irq) {
> +		edac_printk(KERN_ERR, NPCM_EDAC_MOD_NAME,
> +			    "irq number not defined for ECC.\n");
> +		goto err;

According to the documentation in `drivers/base/platform.c` you should 
check for `irq < 0`?

> +	}
> +	ret = devm_request_irq(dev, irq, edac_ecc_isr, 0,
> +			       "cdns-edac-mc-ecc-irq", mci);
> +	if (ret) {
> +		edac_printk(KERN_ERR, NPCM_EDAC_MOD_NAME,
> +			    "request_irq fail for NPCM_EDAC irq\n");
> +		goto err;
> +	}
> +	ret = edac_mc_add_mc(mci);
> +	if (ret) {
> +		edac_printk(KERN_ERR, NPCM_EDAC_MOD_NAME,
> +			    "Failed to register with EDAC core\n");
> +		goto err;
> +	}
> +
> +#ifdef CONFIG_EDAC_DEBUG
> +	if ((npcm_chip->ip_features & FORCED_ECC_ERR_EVENT_SUPPORT) &&
> +	    npcm_chip->chip == NPCM8XX_CHIP) {
> +		if (create_sysfs_attributes(mci)) {
> +			edac_printk(KERN_ERR, NPCM_EDAC_MOD_NAME,
> +				    "Failed to create sysfs entries\n");
> +			goto err1;
> +		}
> +	}
> +#endif
> +
> +	/* Only enable MC interrupts with ECC - clear global int mask bit and ecc bit */
> +	writel(npcm_chip->ecc_ctl_en_int_master_mask,
> +	       priv_data->reg + npcm_chip->ecc_ctl_int_mask_master);
> +
> +	if (npcm_chip->chip == NPCM8XX_CHIP) {
> +		/* clear single and multi for ce and ue */
> +		writel(npcm_chip->ecc_ctl_en_int_ecc_mask,
> +		       priv_data->reg + npcm_chip->ecc_ctl_int_mask_ecc);
> +	}
> +
> +	return 0;
> +
> +#ifdef CONFIG_EDAC_DEBUG
> +err1:
> +#endif
> +
> +	edac_mc_del_mc(&pdev->dev);
> +
> +err:
> +	edac_mc_free(mci);
> +	return ret;
> +}
> +
> +static int npcm_edac_mc_remove(struct platform_device *pdev)
> +{
> +	struct mem_ctl_info *mci = platform_get_drvdata(pdev);
> +	struct priv_data *priv = mci->pvt_info;
> +	const struct npcm_edac_platform_data *npcm_chip = priv->npcm_chip;
> +
> +	writel(NPCM_ECC_CTL_GLOBAL_INT_DISABLE, priv->reg + npcm_chip->ecc_ctl_int_mask_master);
> +
> +	/* Disable ecc feature before removing driver by writing 0 */
> +	writel((unsigned int)(~(npcm_chip->ecc_ctl_ecc_enable_mask)),
> +	       priv->reg + npcm_chip->ecc_ctl_en_reg);
> +
> +#ifdef CONFIG_EDAC_DEBUG
> +	remove_sysfs_attributes(mci);
> +#endif
> +	edac_mc_del_mc(&pdev->dev);
> +	edac_mc_free(mci);
> +
> +	return 0;
> +}
> +
> +static struct platform_driver npcm_edac_mc_driver = {
> +	.driver = {
> +		   .name = "npcm-edac",
> +		   .of_match_table = npcm_edac_of_match,
> +	},
> +	.probe = npcm_edac_mc_probe,
> +	.remove = npcm_edac_mc_remove,
> +};
> +
> +module_platform_driver(npcm_edac_mc_driver);
> +
> +MODULE_AUTHOR("Medad <ctcchien@nuvoton.com>");
> +MODULE_DESCRIPTION("Nuvoton NPCM EDAC Driver");
> +MODULE_LICENSE("GPL v2");


Kind regards,

Paul

Re: [PATCH v6 3/3] EDAC: nuvoton: Add NPCM memory controller driver

[Medad Young]

Dear Paul,



Paul Menzel <pmenzel@molgen.mpg.de> 於 2022年4月9日 週六 下午3:08寫道：
>
> Dear Medad,
>
>
> Am 22.03.22 um 04:01 schrieb Medad CChien:
> > Add support for Nuvoton NPCM SoC.
>
> Please also mention *memory controller* here.
>
> Please also mention the datasheet name, revision, and section here.
>
> > Signed-off-by: Medad CChien <ctcchien@nuvoton.com>
> >
> > Reported-by: kernel test robot <lkp@intel.com>
> >
> > All errors (new ones prefixed by >>):
>
> […]
>
> Hmm, you add new code here, right? Is that report for an earlier patch
> version? Please make that more clear.

OK

>
> […]
>
> On what device did you test it? Maybe paste the new log messages, and
> also give an example how to force an ECC error, so it’s easy to test, if
> the driver works.

OK, I  will provide an example and paste the result log

>
> > ---
> >   drivers/edac/Kconfig     |   9 +
> >   drivers/edac/Makefile    |   1 +
> >   drivers/edac/npcm_edac.c | 706 +++++++++++++++++++++++++++++++++++++++
> >   3 files changed, 716 insertions(+)
> >   create mode 100644 drivers/edac/npcm_edac.c
> >
> > diff --git a/drivers/edac/Kconfig b/drivers/edac/Kconfig
> > index 58ab63642e72..bdca55fa6022 100644
> > --- a/drivers/edac/Kconfig
> > +++ b/drivers/edac/Kconfig
> > @@ -539,4 +539,13 @@ config EDAC_DMC520
> >         Support for error detection and correction on the
> >         SoCs with ARM DMC-520 DRAM controller.
> >
> > +config EDAC_NPCM
> > +     tristate "Nuvoton NPCM DDR Memory Controller"
> > +     depends on (ARCH_NPCM || COMPILE_TEST)
> > +     help
> > +       Support for error detection and correction on the
> > +       Nuvoton NPCM DDR memory controller.
>
> Some words fit on the line above.
>
> > +       First, ECC must be configured in the BootBlock header. Then, this driver
>
> Again, *bootblock* does not seem to be a common term in the Linux
> kernel. Did you meant bootloader?

bootblock is a spcial bootloader before u-boot on Nuvoton's BMC platform.

>
> > +       will expose error counters via the EDAC kernel framework.
> > +
> >   endif # EDAC
> > diff --git a/drivers/edac/Makefile b/drivers/edac/Makefile
> > index 2d1641a27a28..db3c59d3ad84 100644
> > --- a/drivers/edac/Makefile
> > +++ b/drivers/edac/Makefile
> > @@ -84,3 +84,4 @@ obj-$(CONFIG_EDAC_QCOM)                     += qcom_edac.o
> >   obj-$(CONFIG_EDAC_ASPEED)           += aspeed_edac.o
> >   obj-$(CONFIG_EDAC_BLUEFIELD)                += bluefield_edac.o
> >   obj-$(CONFIG_EDAC_DMC520)           += dmc520_edac.o
> > +obj-$(CONFIG_EDAC_NPCM)                      += npcm_edac.o
> > diff --git a/drivers/edac/npcm_edac.c b/drivers/edac/npcm_edac.c
> > new file mode 100644
> > index 000000000000..9dd05bec0b7f
> > --- /dev/null
> > +++ b/drivers/edac/npcm_edac.c
> > @@ -0,0 +1,706 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +// Copyright (c) 2022 Nuvoton Technology corporation.
>
> Dot/period at the end not needed.

OK

>
> > +
> > +#include <linux/delay.h>
> > +#include <linux/of_device.h>
> > +
> > +#include "edac_module.h"
> > +
> > +#define NPCM_EDAC_MOD_NAME "npcm-edac"
> > +#define FORCED_ECC_ERR_EVENT_SUPPORT BIT(1)
> > +#define EDAC_MSG_SIZE                  256
> > +/* Granularity of reported error in bytes */
> > +#define NPCM_EDAC_ERR_GRAIN          1
> > +
> > +#define MEM_TYPE_DDR4                        0xA
> > +
> > +#define NPCM8XX_CHIP                 0x800
> > +#define NPCM7XX_CHIP                 0x700
>
> Sort other way around?

OK, I will reorder these two lines


>
> > +
> > +/* Control register width definitions */
> > +#define WDTH_16                              (2)
> > +#define WDTH_32                              (1)
> > +#define WDTH_64                              (0)
> > +#define CTL_MEM_MAX_WIDTH_MASK               GENMASK(4, 0)
> > +#define CTL_REG_WIDTH_SHIFT          (32)
> > +#define XOR_CHECK_BIT_SPLIT_WIDTH            (16)
> > +#define CTL_CONTROLLER_BUSY_FLAG     BIT(0)
> > +#define NPCM_ECC_CTL_FORCE_WC                BIT(8)
> > +#define NPCM_ECC_CTL_AUTO_WRITEBACK_EN       BIT(24)
> > +#define NPCM_ECC_CTL_XOR_BITS_MASK           GENMASK(23, 16)
> > +#define NPCM_ECC_CTL_MTYPE_MASK                      GENMASK(11, 8)
> > +#define NPCM_ECC_CTL_GLOBAL_INT_DISABLE      BIT(31)
> > +
> > +#ifdef CONFIG_EDAC_DEBUG
>
> Instead of doing this in the preprocessor, can you always define the
> values, and in the code, do all the checks in C code?
>
>      if IS_ENABLED(CONFIG_EDAC_DEBUG)
>
> > +
> > +/* Syndrome values */
> > +#define ECC_DOUBLE_MULTI_ERR_SYND    0x03
> > +
> > +static char data_synd[] = {
> > +                     0xf4, 0xf1, 0xec, 0xea, 0xe9, 0xe6, 0xe5, 0xe3,
> > +                     0xdc, 0xda, 0xd9, 0xd6, 0xd5, 0xd3, 0xce, 0xcb,
> > +                     0xb5, 0xb0, 0xad, 0xab, 0xa8, 0xa7, 0xa4, 0xa2,
> > +                     0x9d, 0x9b, 0x98, 0x97, 0x94, 0x92, 0x8f, 0x8a,
> > +                     0x75, 0x70, 0x6d, 0x6b, 0x68, 0x67, 0x64, 0x62,
> > +                     0x5e, 0x5b, 0x58, 0x57, 0x54, 0x52, 0x4f, 0x4a,
> > +                     0x34, 0x31, 0x2c, 0x2a, 0x29, 0x26, 0x25, 0x23,
> > +                     0x1c, 0x1a, 0x19, 0x16, 0x15, 0x13, 0x0e, 0x0b
> > +               };
> > +
> > +static char check_synd[] = {0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80};
> > +#endif
> > +
> > +struct npcm_edac_platform_data {
> > +     /* force ECC event */
> > +     u32 ip_features;
> > +     u32 ddr_ctl_controller_busy_reg;
> > +     u32 ecc_ctl_xor_check_bits_reg;
> > +
> > +     u32 chip;
> > +
> > +     /* DDR4 Controller Registers */
> > +     u32 ddr_ctl_mem_type_reg;
> > +     u32 ddr_ctl_mem_width_reg;
> > +
> > +     u32 ecc_ctl_en_reg;
> > +     u32 ecc_ctl_int_mask;
> > +     u32 ecc_ctl_int_status;
> > +     u32 ecc_ctl_int_ack;
> > +     u32 ecc_ctl_int_mask_master;
> > +     u32 ecc_ctl_int_mask_ecc;
> > +
> > +     u32 ecc_sig_ecc_c_addr_l;
> > +     u32 ecc_sig_ecc_c_addr_h;
> > +     u32 ecc_sig_ecc_c_data_l;
> > +     u32 ecc_sig_ecc_c_data_h;
> > +     u32 ecc_sig_ecc_c_id;
> > +     u32 ecc_sig_ecc_c_synd;
> > +
> > +     u32 ecc_sig_ecc_u_addr_l;
> > +     u32 ecc_sig_ecc_u_addr_h;
> > +     u32 ecc_sig_ecc_u_data_l;
> > +     u32 ecc_sig_ecc_u_data_h;
> > +     u32 ecc_sig_ecc_u_id;
> > +     u32 ecc_sig_ecc_u_synd;
> > +
> > +     /* MASK */
> > +     u32 ecc_ctl_ecc_enable_mask;
> > +     u32 ecc_ctl_en_int_master_mask;
> > +     u32 ecc_ctl_en_int_ecc_mask;
> > +
> > +     /* ECC IRQ Macros */
> > +     u32 ecc_int_ce_event;
> > +     u32 ecc_int_second_ce_event;
> > +     u32 ecc_int_ue_event;
> > +     u32 ecc_int_second_ue_event;
> > +     u32 ecc_int_ce_ue_mask;
> > +     u32 ecc_ce_intr_mask;
> > +     u32 ecc_ue_intr_mask;
> > +
> > +     /* ECC Signature Macros */
> > +     u32 ecc_sig_ecc_c_id_shift;
> > +     u32 ecc_sig_ecc_c_synd_shift;
> > +     u32 ecc_sig_ecc_c_addr_h_mask;
> > +     u32 ecc_sig_ecc_c_id_mask;
> > +     u32 ecc_sig_ecc_c_synd_mask;
> > +
> > +     u32 ecc_sig_ecc_u_id_shift;
> > +     u32 ecc_sig_ecc_u_synd_shift;
> > +     u32 ecc_sig_ecc_u_addr_h_mask;
> > +     u32 ecc_sig_ecc_u_id_mask;
> > +     u32 ecc_sig_ecc_u_synd_mask;
> > +};
> > +
> > +struct priv_data {
> > +     void __iomem *reg;
> > +     u32 ce_cnt;
> > +     u32 ue_cnt;
> > +     char message[EDAC_MSG_SIZE];
> > +     const struct npcm_edac_platform_data *npcm_chip;
> > +};
> > +
> > +#ifdef CONFIG_EDAC_DEBUG
> > +static void init_mem_layout(struct mem_ctl_info *mci)
> > +{
> > +     struct priv_data *priv = mci->pvt_info;
> > +     const struct npcm_edac_platform_data *npcm_chip = priv->npcm_chip;
> > +     struct csrow_info *csi;
> > +     struct dimm_info *dimm;
> > +     struct sysinfo inf;
>
> Maybe name it at least info, so it can’t be confused with infinity.

OK

>
> > +     enum mem_type mtype;
> > +     u32 val, width;
> > +     u32 size, row;
>
> Please use native types, for example `unsigned long` for `size`.

OK

>
> > +     u8 j;
>
> Ditto. For smaller data types than the native type, the compiler
> actually needs to create more instructions.

OK

>
> > +
> > +     dimm = edac_get_dimm(mci, 0, 0, 0);
> > +     if (!dimm) {
> > +             si_meminfo(&inf);
> > +             for (row = 0; row < mci->nr_csrows; row++) {
> > +                     csi = mci->csrows[row];
> > +                     size = inf.totalram * inf.mem_unit;
>
> Can be moved outside the loop?

Yes

>
> > +
> > +                     for (j = 0; j < csi->nr_channels; j++) {
> > +                             dimm            = csi->channels[j]->dimm;
> > +                             dimm->edac_mode = EDAC_FLAG_SECDED;
> > +                             /* Get memory type by reading hw registers*/
> > +                             val = readl(priv->reg + npcm_chip->ddr_ctl_mem_type_reg);
> > +                             mtype = val & NPCM_ECC_CTL_MTYPE_MASK;
> > +
> > +                             if (mtype == MEM_TYPE_DDR4)
> > +                                     dimm->mtype = MEM_DDR4;
> > +                             else
> > +                                     dimm->mtype = MEM_EMPTY;
>
> Use ternary operator?
>
>      dimm-mtype = (mtype == MEM_TYPE_DDR4) ? MEM_DDR4 : MEM_EMPTY;

OK,thanks

>
> > +
> > +                             /*Get EDAC devtype width for the current mc*/
> > +                             width = readl(priv->reg + npcm_chip->ddr_ctl_mem_width_reg)
> > +                                           & CTL_MEM_MAX_WIDTH_MASK;
> > +                             switch (width) {
> > +                             case WDTH_16:
> > +                                     dimm->dtype  = DEV_X2;
>
> Just one space before =.

OK

>
> > +                                     break;
> > +                             case WDTH_32:
> > +                                     dimm->dtype  = DEV_X4;
> > +                                     break;
> > +                             case WDTH_64:
> > +                                     dimm->dtype  = DEV_X8;
> > +                                     break;
> > +                             default:
> > +                                     dimm->dtype = DEV_UNKNOWN;
> > +                             }
> > +
> > +                             dimm->nr_pages  = (size >> PAGE_SHIFT) /
> > +                                     csi->nr_channels;
> > +                             dimm->grain     = NPCM_EDAC_ERR_GRAIN;
> > +                     }
> > +             }
> > +     }
> > +}
> > +#endif
> > +
> > +static void handle_ce(struct mem_ctl_info *mci)
>
> The function is not called often, so use `handle_correctable_error()`?
>
> > +{
> > +     struct priv_data *priv = mci->pvt_info;
> > +     const struct npcm_edac_platform_data *npcm_chip = priv->npcm_chip;
> > +     u64 err_c_addr = 0x0;
>
> size_t

OK

>
> > +     u64 err_c_data = 0x0;
> > +     u32 err_c_synd, err_c_id;
> > +     u32 sig_val_l, sig_val_h;
> > +
> > +     sig_val_l = readl(priv->reg + npcm_chip->ecc_sig_ecc_c_addr_l);
> > +
> > +     if (npcm_chip->chip == NPCM8XX_CHIP)
> > +             sig_val_h = (readl(priv->reg + npcm_chip->ecc_sig_ecc_c_addr_h) &
> > +                             npcm_chip->ecc_sig_ecc_c_addr_h_mask);
> > +     else
> > +             sig_val_h = 0x0;
> > +
> > +     err_c_addr = (((err_c_addr | sig_val_h) <<
> > +                             CTL_REG_WIDTH_SHIFT) | sig_val_l);
> > +
> > +     sig_val_l = readl(priv->reg + npcm_chip->ecc_sig_ecc_c_data_l);
> > +
> > +     if (npcm_chip->chip == NPCM8XX_CHIP)
> > +             sig_val_h = readl(priv->reg + npcm_chip->ecc_sig_ecc_c_data_h);
> > +     else
> > +             sig_val_h = 0x0;
> > +
> > +     err_c_data = (((err_c_data | sig_val_h) <<
> > +                             CTL_REG_WIDTH_SHIFT) | sig_val_l);
> > +
> > +     err_c_id = ((readl(priv->reg + npcm_chip->ecc_sig_ecc_c_id) &
> > +                             npcm_chip->ecc_sig_ecc_c_id_mask) >>
> > +                             npcm_chip->ecc_sig_ecc_c_id_shift);
> > +
> > +     err_c_synd = ((readl(priv->reg + npcm_chip->ecc_sig_ecc_c_synd) &
> > +                             npcm_chip->ecc_sig_ecc_c_synd_mask) >>
> > +                             npcm_chip->ecc_sig_ecc_c_synd_shift);
> > +
> > +     priv->ce_cnt = priv->ce_cnt + 1;
>
> Ditto.
>
> > +
> > +     snprintf(priv->message,
> > +              EDAC_MSG_SIZE, "DDR ECC %s: data=0x%llx source_id=%#08x",
> > +              mci->ctl_name, err_c_data, err_c_id);
> > +
> > +     edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci,
> > +                          1,
> > +                          err_c_addr >> PAGE_SHIFT,
> > +                          err_c_addr & ~PAGE_MASK,
> > +                          err_c_synd, 0, 0, -1,
> > +                          priv->message, "");
> > +}
> > +
> > +static void handle_ue(struct mem_ctl_info *mci)
> > +{
> > +     struct priv_data *priv = mci->pvt_info;
> > +     const struct npcm_edac_platform_data *npcm_chip = priv->npcm_chip;
> > +     u64 err_u_addr = 0x0;
>
> Why not size_t? No initialization needed?

I will change to size_t
>
> > +     u64 err_u_data = 0x0;
> > +     u32 err_u_synd, err_u_id;
> > +     u32 sig_val_l, sig_val_h;
> > +
> > +     sig_val_l = readl(priv->reg + npcm_chip->ecc_sig_ecc_u_addr_l);
> > +
> > +     if (npcm_chip->chip == NPCM8XX_CHIP)
> > +             sig_val_h = (readl(priv->reg + npcm_chip->ecc_sig_ecc_u_addr_h) &
> > +                             npcm_chip->ecc_sig_ecc_u_addr_h_mask);
> > +     else
> > +             sig_val_h = 0x0;
> > +
> > +     err_u_addr = (((err_u_addr | sig_val_h) <<
> > +                             CTL_REG_WIDTH_SHIFT) | sig_val_l);
> > +
> > +     sig_val_l = readl(priv->reg + npcm_chip->ecc_sig_ecc_u_data_l);
> > +
> > +     if (npcm_chip->chip == NPCM8XX_CHIP)
> > +             sig_val_h = readl(priv->reg + npcm_chip->ecc_sig_ecc_u_data_h);
> > +     else
> > +             sig_val_h = 0x0;
> > +
> > +     err_u_data = (((err_u_data | sig_val_h) <<
> > +                             CTL_REG_WIDTH_SHIFT) | sig_val_l);
> > +
> > +     err_u_id = ((readl(priv->reg + npcm_chip->ecc_sig_ecc_u_id) &
> > +                             npcm_chip->ecc_sig_ecc_u_id_mask) >>
> > +                     npcm_chip->ecc_sig_ecc_u_id_shift);
> > +
> > +     err_u_synd = ((readl(priv->reg + npcm_chip->ecc_sig_ecc_u_synd) &
> > +                             npcm_chip->ecc_sig_ecc_u_synd_mask) >>
> > +                     npcm_chip->ecc_sig_ecc_u_synd_shift);
> > +     priv->ue_cnt = priv->ue_cnt + 1;
>
> priv->ue_cnt += 1

OK

>
> > +
> > +     snprintf(priv->message, EDAC_MSG_SIZE,
> > +              "DDR ECC %s: addr=0x%llx data=0x%llx source_id=%#08x",
> > +              mci->ctl_name, err_u_addr, err_u_data, err_u_id);
> > +
> > +     edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci,
> > +                          1,
> > +                          err_u_addr >> PAGE_SHIFT,
> > +                          err_u_addr & ~PAGE_MASK,
> > +                          err_u_synd, 0, 0, -1,
> > +                          priv->message, "");
> > +}
> > +
> > +static irqreturn_t edac_ecc_isr(int irq, void *dev_id)
> > +{
> > +     struct mem_ctl_info *mci = dev_id;
> > +     struct priv_data *priv = mci->pvt_info;
> > +     const struct npcm_edac_platform_data *npcm_chip = priv->npcm_chip;
> > +     u32 intr_status;
> > +     u32 val;
> > +
> > +     /* Check the intr status and confirm ECC error intr */
> > +     intr_status = readl(priv->reg + npcm_chip->ecc_ctl_int_status);
> > +
> > +     edac_dbg(3, "InterruptStatus : 0x%x\n", intr_status);
>
> Remove the space before the colon? Maybe use:
>
> "Interrupt status (intr_status): 0x%x\n"

OK

>
> > +     val = intr_status & npcm_chip->ecc_int_ce_ue_mask;
> > +     if (!((val & npcm_chip->ecc_ce_intr_mask) || (val & npcm_chip->ecc_ue_intr_mask)))
> > +             return IRQ_NONE;
> > +
> > +     if (val & npcm_chip->ecc_ce_intr_mask) {
> > +             handle_ce(mci);
> > +
> > +             /* Clear the interrupt source */
> > +             if (val & npcm_chip->ecc_int_ce_event)
> > +                     writel(npcm_chip->ecc_int_ce_event, priv->reg + npcm_chip->ecc_ctl_int_ack);
> > +             else if (val & npcm_chip->ecc_int_second_ce_event)
> > +                     writel(npcm_chip->ecc_int_second_ce_event,
> > +                            priv->reg + npcm_chip->ecc_ctl_int_ack);
> > +             else
> > +                     edac_printk(KERN_ERR, NPCM_EDAC_MOD_NAME, "Failed to clear IRQ\n");
>
> Mention the interrupt too?

OK

>
> > +     }
> > +
> > +     if (val & npcm_chip->ecc_ue_intr_mask) {
> > +             handle_ue(mci);
> > +
> > +             /* Clear the interrupt source */
> > +             if (val & npcm_chip->ecc_int_ue_event)
> > +                     writel(npcm_chip->ecc_int_ue_event, priv->reg + npcm_chip->ecc_ctl_int_ack);
> > +             else if (val & npcm_chip->ecc_int_second_ue_event)
> > +                     writel(npcm_chip->ecc_int_second_ue_event,
> > +                            priv->reg + npcm_chip->ecc_ctl_int_ack);
> > +             else
> > +                     edac_printk(KERN_ERR, NPCM_EDAC_MOD_NAME, "Failed to clear IRQ\n");
> > +     }
> > +
> > +     edac_dbg(3, "Total error count CE %d UE %d\n",
> > +              priv->ce_cnt, priv->ue_cnt);
> > +
> > +     return IRQ_HANDLED;
> > +}
> > +
> > +#ifdef CONFIG_EDAC_DEBUG
> > +
> > +static ssize_t forced_ecc_error_show(struct device *dev,
> > +                                  struct device_attribute *mattr,
> > +                                  char *data)
> > +{
> > +     return sprintf(data, "CDNS-DDR4 Force Injection Help:\n"
> > +                    "CE: Corrected\n"
> > +                    "checkcode/data:source\n"
> > +                    "bit [0-63] for data [0-7] for checkcode:bit number\n"
> > +                    "--------------------------------------------------\n"
> > +                    "UE: Uncorrected\n");
> > +}
> > +
> > +static ssize_t forced_ecc_error_store(struct device *dev,
> > +                                   struct device_attribute *mattr,
> > +                                   const char *data, size_t count)
> > +{
> > +     struct mem_ctl_info *mci = to_mci(dev);
> > +     struct priv_data *priv = mci->pvt_info;
> > +     const struct npcm_edac_platform_data *npcm_chip = priv->npcm_chip;
> > +     int     args_cnt;
>
> unsigned int?

from https://elixir.bootlin.com/linux/latest/source/lib/argv_split.c
args_cnt for argv_split should be int

>
> > +     int     ret;
> > +     char    **args;
> > +     u32     regval;
> > +     u8      bit_no;
>
> Please use native types.

OK

>
> > +
> > +     /* Split string buffer into separate parameters */
> > +     args = argv_split(GFP_KERNEL, data, &args_cnt);
> > +
> > +     /* Check ecc enabled */
> > +     if (!(readl(priv->reg + npcm_chip->ecc_ctl_en_reg) & npcm_chip->ecc_ctl_ecc_enable_mask))
> > +             return count;
> > +
> > +     /* Check no write operation pending to controller*/
>
> Missing space before the comment terminator `*/`. Also in several other
> places.

OK

>
> > +     while (readl(priv->reg + npcm_chip->ddr_ctl_controller_busy_reg) &
> > +                     CTL_CONTROLLER_BUSY_FLAG) {
> > +             usleep_range(1000, 10000);
> > +     }
> > +
> > +     /* Write appropriate syndrome to xor_check_bit*/
> > +     if (!strcmp(args[0], "CE") && args_cnt == 3) {
> > +             ret = kstrtou8(args[2], 0, &bit_no);
> > +             if (ret)
> > +                     return ret;
> > +             if (!strcmp(args[1], "checkcode")) {
> > +                     if (bit_no > 7) {
> > +                             edac_printk(KERN_INFO, NPCM_EDAC_MOD_NAME, "bit_no for checkcode must be 0~7\n");
> > +                             return count;
> > +                     }
> > +                     regval = readl(priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
> > +                     regval = (regval & ~(NPCM_ECC_CTL_XOR_BITS_MASK)) |
> > +                             (check_synd[bit_no] << XOR_CHECK_BIT_SPLIT_WIDTH);
> > +                     writel(regval, priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
> > +             } else if (!strcmp(args[1], "data")) {
> > +                     if (bit_no > 63) {
> > +                             edac_printk(KERN_INFO, NPCM_EDAC_MOD_NAME, "bit_no for data must be 0~63\n");
> > +                             return count;
> > +                     }
> > +                     regval = readl(priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
> > +                     regval = (regval & ~(NPCM_ECC_CTL_XOR_BITS_MASK)) |
> > +                                      (data_synd[bit_no] << XOR_CHECK_BIT_SPLIT_WIDTH);
> > +                     writel(regval, priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
> > +             }
> > +             /* Enable the ECC writeback_en for corrected error */
> > +             regval = readl(priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
> > +             writel((regval | NPCM_ECC_CTL_AUTO_WRITEBACK_EN),
> > +                    priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
> > +     } else if (!strcmp(args[0], "UE")) {
> > +             regval = readl(priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
> > +             regval = (regval & ~(NPCM_ECC_CTL_XOR_BITS_MASK)) |
> > +                              (ECC_DOUBLE_MULTI_ERR_SYND << XOR_CHECK_BIT_SPLIT_WIDTH);
> > +             writel(regval, priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
> > +     }
> > +
> > +     /* Assert fwc */
> > +     writel((NPCM_ECC_CTL_FORCE_WC | readl(priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg)),
> > +            priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
> > +
> > +     return count;
> > +}
> > +
> > +static DEVICE_ATTR_RW(forced_ecc_error);
> > +static int create_sysfs_attributes(struct mem_ctl_info *mci)
> > +{
> > +     int rc;
> > +
> > +     rc = device_create_file(&mci->dev, &dev_attr_forced_ecc_error);
> > +     if (rc < 0)
> > +             return rc;
> > +     return 0;
> > +}
> > +
> > +static void remove_sysfs_attributes(struct mem_ctl_info *mci)
> > +{
> > +     device_remove_file(&mci->dev, &dev_attr_forced_ecc_error);
> > +}
> > +
> > +#endif
> > +
> > +static const struct npcm_edac_platform_data npcm7xx_edac = {
> > +     .chip = NPCM7XX_CHIP,
> > +
> > +     /* CDNS DDR4 Controller Registers */
> > +     .ecc_ctl_en_reg = 0x174,
> > +     .ecc_ctl_int_status = 0x1D0,
> > +     .ecc_ctl_int_ack = 0x1D4,
> > +     .ecc_ctl_int_mask_master = 0x1D8,
> > +
> > +     .ecc_sig_ecc_c_addr_l = 0x188,
> > +     .ecc_sig_ecc_c_data_l = 0x190,
> > +     .ecc_sig_ecc_c_id = 0x194,
> > +     .ecc_sig_ecc_c_synd = 0x18C,
> > +
> > +     .ecc_sig_ecc_u_addr_l = 0x17C,
> > +     .ecc_sig_ecc_u_data_l = 0x184,
> > +     .ecc_sig_ecc_u_id = 0x194,
> > +     .ecc_sig_ecc_u_synd = 0x180,
> > +
> > +     /* MASK */
> > +     .ecc_ctl_ecc_enable_mask = BIT(24),
> > +     .ecc_ctl_en_int_master_mask = GENMASK(30, 7) | GENMASK(2, 0),
> > +
> > +     /* ECC IRQ Macros */
> > +     .ecc_int_ce_event = BIT(3),
> > +     .ecc_int_second_ce_event = BIT(4),
> > +     .ecc_int_ue_event = BIT(5),
> > +     .ecc_int_second_ue_event = BIT(6),
> > +     .ecc_int_ce_ue_mask = GENMASK(6, 3),
> > +     .ecc_ce_intr_mask = GENMASK(4, 3),
> > +     .ecc_ue_intr_mask = GENMASK(6, 5),
> > +
> > +     /* ECC Signature Macros */
> > +     .ecc_sig_ecc_c_id_shift = 16,
> > +     .ecc_sig_ecc_c_synd_shift = 0,
> > +
> > +     .ecc_sig_ecc_c_id_mask = GENMASK(29, 16),
> > +     .ecc_sig_ecc_c_synd_mask = GENMASK(6, 0),
> > +
> > +     .ecc_sig_ecc_u_id_shift = 0,
> > +     .ecc_sig_ecc_u_synd_shift = 0,
> > +
> > +     .ecc_sig_ecc_u_id_mask = GENMASK(13, 0),
> > +     .ecc_sig_ecc_u_synd_mask = GENMASK(6, 0),
> > +};
> > +
> > +static const struct npcm_edac_platform_data npcm8xx_edac = {
> > +#ifdef CONFIG_EDAC_DEBUG
> > +     .ip_features = FORCED_ECC_ERR_EVENT_SUPPORT,
> > +     .ddr_ctl_controller_busy_reg = 0x20C,
> > +     .ecc_ctl_xor_check_bits_reg = 0x174,
> > +#endif
> > +
> > +     .chip = NPCM8XX_CHIP,
> > +
> > +     /* CDNS DDR4 Controller Registers */
> > +     .ddr_ctl_mem_type_reg = 0x000,
> > +     .ddr_ctl_mem_width_reg = 0x00c,
> > +
> > +     .ecc_ctl_en_reg = 0x16C,
> > +     .ecc_ctl_int_status = 0x228,
> > +     .ecc_ctl_int_ack = 0x244,
> > +     .ecc_ctl_int_mask_master = 0x220,
> > +     .ecc_ctl_int_mask_ecc = 0x260,
> > +
> > +     .ecc_sig_ecc_c_addr_l = 0x18C,
> > +     .ecc_sig_ecc_c_addr_h = 0x190,
> > +     .ecc_sig_ecc_c_data_l = 0x194,
> > +     .ecc_sig_ecc_c_data_h = 0x198,
> > +     .ecc_sig_ecc_c_id = 0x19C,
> > +     .ecc_sig_ecc_c_synd = 0x190,
> > +
> > +     .ecc_sig_ecc_u_addr_l = 0x17C,
> > +     .ecc_sig_ecc_u_addr_h = 0x180,
> > +     .ecc_sig_ecc_u_data_l = 0x184,
> > +     .ecc_sig_ecc_u_data_h = 0x188,
> > +     .ecc_sig_ecc_u_id = 0x19C,
> > +     .ecc_sig_ecc_u_synd = 0x180,
> > +
> > +     /* MASK */
> > +     .ecc_ctl_ecc_enable_mask = GENMASK(17, 16),
> > +     .ecc_ctl_en_int_master_mask = GENMASK(30, 3) | GENMASK(1, 0),
> > +     .ecc_ctl_en_int_ecc_mask = GENMASK(8, 4),
> > +
> > +     /* ECC IRQ Macros */
> > +     .ecc_int_ce_event = BIT(0),
> > +     .ecc_int_second_ce_event = BIT(1),
> > +     .ecc_int_ue_event = BIT(2),
> > +     .ecc_int_second_ue_event = BIT(3),
> > +     .ecc_int_ce_ue_mask = GENMASK(3, 0),
> > +     .ecc_ce_intr_mask = GENMASK(1, 0),
> > +     .ecc_ue_intr_mask = GENMASK(3, 2),
> > +
> > +     /* ECC Signature Macros */
> > +     .ecc_sig_ecc_c_id_shift = 8,
> > +     .ecc_sig_ecc_c_synd_shift = 8,
> > +     .ecc_sig_ecc_c_addr_h_mask = GENMASK(1, 0),
> > +     .ecc_sig_ecc_c_id_mask = GENMASK(29, 16),
> > +     .ecc_sig_ecc_c_synd_mask = GENMASK(15, 8),
> > +
> > +     .ecc_sig_ecc_u_id_shift = 0,
> > +     .ecc_sig_ecc_u_synd_shift = 8,
> > +     .ecc_sig_ecc_u_addr_h_mask = GENMASK(1, 0),
> > +     .ecc_sig_ecc_u_id_mask = GENMASK(13, 0),
> > +     .ecc_sig_ecc_u_synd_mask = GENMASK(15, 8),
> > +};
> > +
> > +static const struct of_device_id npcm_edac_of_match[] = {
> > +     { .compatible = "nuvoton,npcm845-memory-controller", .data = &npcm8xx_edac },
> > +     { .compatible = "nuvoton,npcm750-memory-controller", .data = &npcm7xx_edac },
>
> Sort this the other way?

OK

>
> > +     {},
> > +};
> > +
> > +MODULE_DEVICE_TABLE(of, npcm_edac_of_match);
> > +
> > +static int npcm_edac_mc_probe(struct platform_device *pdev)
> > +{
> > +     const struct npcm_edac_platform_data *npcm_chip;
> > +     struct device *dev = &pdev->dev;
> > +     struct edac_mc_layer layers[1];
> > +     const struct of_device_id *id;
> > +     struct priv_data *priv_data;
> > +     struct mem_ctl_info *mci;
> > +     struct resource *res;
> > +     void __iomem *reg;
> > +     int ret = -ENODEV;
> > +     int irq;
> > +     u32 ecc_en;
> > +
> > +     id = of_match_device(npcm_edac_of_match, &pdev->dev);
> > +
> > +     npcm_chip = of_device_get_match_data(&pdev->dev);
> > +
> > +     res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > +     reg = devm_ioremap_resource(dev, res);
> > +     if (IS_ERR(reg)) {
> > +             edac_printk(KERN_ERR, NPCM_EDAC_MOD_NAME,
> > +                         "cdns DDR4 mc regs are not defined\n");
> > +             return PTR_ERR(reg);
> > +     }
> > +
> > +     ecc_en = readl(reg + npcm_chip->ecc_ctl_en_reg);
> > +
> > +     if ((ecc_en & npcm_chip->ecc_ctl_ecc_enable_mask) == npcm_chip->ecc_ctl_ecc_enable_mask) {
> > +             edac_printk(KERN_INFO, NPCM_EDAC_MOD_NAME, "ECC reporting and correcting on. ");
> > +     } else {
> > +             edac_printk(KERN_INFO, NPCM_EDAC_MOD_NAME, "ECC disabled\n");
> > +             return -ENXIO;
> > +     }
> > +
> > +     edac_printk(KERN_INFO, NPCM_EDAC_MOD_NAME,
> > +                 "IO mapped reg addr: %p\n", reg);
>
> Fits on the line above? Also in several other places.

Ok

>
> > +     layers[0].type = EDAC_MC_LAYER_ALL_MEM;
> > +     layers[0].size = 1;
> > +
> > +     mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers,
> > +                         sizeof(struct priv_data));
> > +     if (!mci) {
> > +             edac_printk(KERN_ERR, NPCM_EDAC_MOD_NAME,
> > +                         "Failed memory allocation for mc instance\n");
> > +             return -ENOMEM;
> > +     }
> > +     mci->pdev = &pdev->dev;
> > +     priv_data = mci->pvt_info;
> > +     priv_data->reg = reg;
> > +     priv_data->npcm_chip = npcm_chip;
> > +     priv_data->ce_cnt = 0;
> > +     priv_data->ue_cnt = 0;
> > +     platform_set_drvdata(pdev, mci);
> > +
> > +     /* Initialize controller capabilities */
> > +     mci->mtype_cap = MEM_FLAG_DDR4;
> > +     mci->edac_ctl_cap = EDAC_FLAG_SECDED;
> > +     mci->scrub_cap = SCRUB_FLAG_HW_SRC;
> > +     mci->scrub_mode = SCRUB_HW_SRC;
> > +     mci->edac_cap = EDAC_FLAG_SECDED;
> > +     mci->ctl_name = id->compatible;
> > +     mci->dev_name = dev_name(&pdev->dev);
> > +     mci->mod_name = NPCM_EDAC_MOD_NAME;
> > +     mci->ctl_page_to_phys = NULL;
> > +
> > +     /* Interrupt feature is supported by cadence mc */
> > +     edac_op_state = EDAC_OPSTATE_INT;
> > +#ifdef CONFIG_EDAC_DEBUG
> > +     init_mem_layout(mci);
> > +#endif
> > +     /* Setup Interrupt handler for ECC */
>
> Set up

OK

>
> > +     irq = platform_get_irq(pdev, 0);
> > +     if (!irq) {
> > +             edac_printk(KERN_ERR, NPCM_EDAC_MOD_NAME,
> > +                         "irq number not defined for ECC.\n");
> > +             goto err;
>
> According to the documentation in `drivers/base/platform.c` you should
> check for `irq < 0`?
>

yes, negative error number on failure.

> > +     }
> > +     ret = devm_request_irq(dev, irq, edac_ecc_isr, 0,
> > +                            "cdns-edac-mc-ecc-irq", mci);
> > +     if (ret) {
> > +             edac_printk(KERN_ERR, NPCM_EDAC_MOD_NAME,
> > +                         "request_irq fail for NPCM_EDAC irq\n");
> > +             goto err;
> > +     }
> > +     ret = edac_mc_add_mc(mci);
> > +     if (ret) {
> > +             edac_printk(KERN_ERR, NPCM_EDAC_MOD_NAME,
> > +                         "Failed to register with EDAC core\n");
> > +             goto err;
> > +     }
> > +
> > +#ifdef CONFIG_EDAC_DEBUG
> > +     if ((npcm_chip->ip_features & FORCED_ECC_ERR_EVENT_SUPPORT) &&
> > +         npcm_chip->chip == NPCM8XX_CHIP) {
> > +             if (create_sysfs_attributes(mci)) {
> > +                     edac_printk(KERN_ERR, NPCM_EDAC_MOD_NAME,
> > +                                 "Failed to create sysfs entries\n");
> > +                     goto err1;
> > +             }
> > +     }
> > +#endif
> > +
> > +     /* Only enable MC interrupts with ECC - clear global int mask bit and ecc bit */
> > +     writel(npcm_chip->ecc_ctl_en_int_master_mask,
> > +            priv_data->reg + npcm_chip->ecc_ctl_int_mask_master);
> > +
> > +     if (npcm_chip->chip == NPCM8XX_CHIP) {
> > +             /* clear single and multi for ce and ue */
> > +             writel(npcm_chip->ecc_ctl_en_int_ecc_mask,
> > +                    priv_data->reg + npcm_chip->ecc_ctl_int_mask_ecc);
> > +     }
> > +
> > +     return 0;
> > +
> > +#ifdef CONFIG_EDAC_DEBUG
> > +err1:
> > +#endif
> > +
> > +     edac_mc_del_mc(&pdev->dev);
> > +
> > +err:
> > +     edac_mc_free(mci);
> > +     return ret;
> > +}
> > +
> > +static int npcm_edac_mc_remove(struct platform_device *pdev)
> > +{
> > +     struct mem_ctl_info *mci = platform_get_drvdata(pdev);
> > +     struct priv_data *priv = mci->pvt_info;
> > +     const struct npcm_edac_platform_data *npcm_chip = priv->npcm_chip;
> > +
> > +     writel(NPCM_ECC_CTL_GLOBAL_INT_DISABLE, priv->reg + npcm_chip->ecc_ctl_int_mask_master);
> > +
> > +     /* Disable ecc feature before removing driver by writing 0 */
> > +     writel((unsigned int)(~(npcm_chip->ecc_ctl_ecc_enable_mask)),
> > +            priv->reg + npcm_chip->ecc_ctl_en_reg);
> > +
> > +#ifdef CONFIG_EDAC_DEBUG
> > +     remove_sysfs_attributes(mci);
> > +#endif
> > +     edac_mc_del_mc(&pdev->dev);
> > +     edac_mc_free(mci);
> > +
> > +     return 0;
> > +}
> > +
> > +static struct platform_driver npcm_edac_mc_driver = {
> > +     .driver = {
> > +                .name = "npcm-edac",
> > +                .of_match_table = npcm_edac_of_match,
> > +     },
> > +     .probe = npcm_edac_mc_probe,
> > +     .remove = npcm_edac_mc_remove,
> > +};
> > +
> > +module_platform_driver(npcm_edac_mc_driver);
> > +
> > +MODULE_AUTHOR("Medad <ctcchien@nuvoton.com>");
> > +MODULE_DESCRIPTION("Nuvoton NPCM EDAC Driver");
> > +MODULE_LICENSE("GPL v2");
>
>
> Kind regards,
>
> Paul

B.R.
Medad

Re: [PATCH v6 3/3] EDAC: nuvoton: Add NPCM memory controller driver

[Borislav Petkov]

On Thu, Apr 14, 2022 at 09:55:05AM +0800, Medad Young wrote:
> > > +                             if (mtype == MEM_TYPE_DDR4)
> > > +                                     dimm->mtype = MEM_DDR4;
> > > +                             else
> > > +                                     dimm->mtype = MEM_EMPTY;
> >
> > Use ternary operator?
> >
> >      dimm-mtype = (mtype == MEM_TYPE_DDR4) ? MEM_DDR4 : MEM_EMPTY;

Ternary operator is less readable than a plain and simple if-else.

> > > +{
> > > +     struct priv_data *priv = mci->pvt_info;
> > > +     const struct npcm_edac_platform_data *npcm_chip = priv->npcm_chip;
> > > +     u64 err_c_addr = 0x0;
> >
> > size_t
> 
> OK

Why is size_t? error address doesn't have anything to do with a
sizeof(), array indexing or loop counting.

It is an error address and having it in an u64 tells you exactly what
its quantity is.

So can we stop the silliness pls?

> > > +static irqreturn_t edac_ecc_isr(int irq, void *dev_id)
> > > +{
> > > +     struct mem_ctl_info *mci = dev_id;
> > > +     struct priv_data *priv = mci->pvt_info;
> > > +     const struct npcm_edac_platform_data *npcm_chip = priv->npcm_chip;
> > > +     u32 intr_status;
> > > +     u32 val;
> > > +
> > > +     /* Check the intr status and confirm ECC error intr */
> > > +     intr_status = readl(priv->reg + npcm_chip->ecc_ctl_int_status);
> > > +
> > > +     edac_dbg(3, "InterruptStatus : 0x%x\n", intr_status);
> >
> > Remove the space before the colon? Maybe use:
> >
> > "Interrupt status (intr_status): 0x%x\n"

And repeat "interrupt status"? Also silly. The question to ask
yourselves should always be: is this error message helpful enough to its
intended recipients.

When I see

  "Interrupt status (intr_status): 0x%x\n"

in my code, I go: "hm, where does this message come from?" because it
ain't helpful enough. So I have to go stare at the code too.

I hope you're catching my drift.

-- 
Regards/Gruss,
    Boris.

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

Re: [PATCH v6 3/3] EDAC: nuvoton: Add NPCM memory controller driver

[Paul Menzel]

Dear Borislav,


Am 14.04.22 um 10:42 schrieb Borislav Petkov:
> On Thu, Apr 14, 2022 at 09:55:05AM +0800, Medad Young wrote:
>>>> +                             if (mtype == MEM_TYPE_DDR4)
>>>> +                                     dimm->mtype = MEM_DDR4;
>>>> +                             else
>>>> +                                     dimm->mtype = MEM_EMPTY;
>>>
>>> Use ternary operator?
>>>
>>>       dimm-mtype = (mtype == MEM_TYPE_DDR4) ? MEM_DDR4 : MEM_EMPTY;
> 
> Ternary operator is less readable than a plain and simple if-else.
> 
>>>> +{
>>>> +     struct priv_data *priv = mci->pvt_info;
>>>> +     const struct npcm_edac_platform_data *npcm_chip = priv->npcm_chip;
>>>> +     u64 err_c_addr = 0x0;
>>>
>>> size_t
>>
>> OK
> 
> Why is size_t? error address doesn't have anything to do with a
> sizeof(), array indexing or loop counting.
> 
> It is an error address and having it in an u64 tells you exactly what
> its quantity is.

Good point. Sorry for missing that.

> So can we stop the silliness pls?

No idea, why you had to ask this question, while you statement before 
already made the point.

>>>> +static irqreturn_t edac_ecc_isr(int irq, void *dev_id)
>>>> +{
>>>> +     struct mem_ctl_info *mci = dev_id;
>>>> +     struct priv_data *priv = mci->pvt_info;
>>>> +     const struct npcm_edac_platform_data *npcm_chip = priv->npcm_chip;
>>>> +     u32 intr_status;
>>>> +     u32 val;
>>>> +
>>>> +     /* Check the intr status and confirm ECC error intr */
>>>> +     intr_status = readl(priv->reg + npcm_chip->ecc_ctl_int_status);
>>>> +
>>>> +     edac_dbg(3, "InterruptStatus : 0x%x\n", intr_status);
>>>
>>> Remove the space before the colon? Maybe use:
>>>
>>> "Interrupt status (intr_status): 0x%x\n"
> 
> And repeat "interrupt status"? Also silly. The question to ask
> yourselves should always be: is this error message helpful enough to its
> intended recipients.
> 
> When I see
> 
>    "Interrupt status (intr_status): 0x%x\n"
> 
> in my code, I go: "hm, where does this message come from?" because it
> ain't helpful enough. So I have to go stare at the code too.
> 
> I hope you're catching my drift.

Sorry I do not get your point. Would you elaborate on the debug message 
so it’s more useful? Or would you keep `InterruptStatus`, or – as it’s a 
debug message – use the variable name? My point was mainly about, why 
not use the variable name directly in the debug message, and the space 
before the colon.


Kind regards,

Paul

Re: [PATCH v6 3/3] EDAC: nuvoton: Add NPCM memory controller driver

[Borislav Petkov]

On Thu, Apr 14, 2022 at 10:56:43AM +0200, Paul Menzel wrote:
> No idea, why you had to ask this question, while you statement before
> already made the point.

You've told Medad one thing. I told him the complete opposite. Medad as
new submitter gets confused. And I don't want patch submitters to get
confused by review.

So, if you're unsure about a review feedback, don't give it pls.

> Sorry I do not get your point. Would you elaborate on the debug message so
> it’s more useful?

Just think of the big picture: is my error message useful enough for
debugging or would I have to go and add more info to it so that I can
debug an issue?

Example:

There is

	edac_dbg(3, "InterruptStatus : 0x%x\n", intr_status);

now.

Now, how about this?

        edac_dbg(3, "dev: %s, id: %s: IRQ: %d, interrupt status: 0x%x\n",
                 mci->dev_name, mci->ctl_name, irq, intr_status);

Which one, do you think, is more helpful to a person trying to debug any
potential issue with the interrupt handler and the ECCs it is supposed
to issue?

Thx.

-- 
Regards/Gruss,
    Boris.

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

Re: [PATCH v6 3/3] EDAC: nuvoton: Add NPCM memory controller driver

[Paul Menzel]

Dear Borislav,


Am 14.04.22 um 12:15 schrieb Borislav Petkov:
> On Thu, Apr 14, 2022 at 10:56:43AM +0200, Paul Menzel wrote:
>> No idea, why you had to ask this question, while you statement before
>> already made the point.
> 
> You've told Medad one thing. I told him the complete opposite.

When? I must have missed your comment then?

> Medad as new submitter gets confused. And I don't want patch
> submitters to get confused by review.
> 
> So, if you're unsure about a review feedback, don't give it pls.

Also during review errors can happen, can’t they? I apologized, and then 
you for catching it.

>> Sorry I do not get your point. Would you elaborate on the debug message so
>> it’s more useful?
> 
> Just think of the big picture: is my error message useful enough for
> debugging or would I have to go and add more info to it so that I can
> debug an issue?
> 
> Example:
> 
> There is
> 
> 	edac_dbg(3, "InterruptStatus : 0x%x\n", intr_status);
> 
> now.
> 
> Now, how about this?
> 
>          edac_dbg(3, "dev: %s, id: %s: IRQ: %d, interrupt status: 0x%x\n",
>                   mci->dev_name, mci->ctl_name, irq, intr_status);
> 
> Which one, do you think, is more helpful to a person trying to debug any
> potential issue with the interrupt handler and the ECCs it is supposed
> to issue?

I am all for more elaborate log messages, but have the feeling, you 
think I am not? Where does the misunderstanding come from?


Kind regards,

Paul

Re: [PATCH v6 3/3] EDAC: nuvoton: Add NPCM memory controller driver

[Borislav Petkov]

On Thu, Apr 14, 2022 at 12:44:13PM +0200, Paul Menzel wrote:
> I am all for more elaborate log messages, but have the feeling, you think I
> am not? Where does the misunderstanding come from?

I don't know. Judging by this reply of yours, the misunderstanding is
considerable.

So I'm going to ask you nicely: for the future and for the code I
maintain, please try hard not to confuse submitters.

Thanks!

-- 
Regards/Gruss,
    Boris.

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