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From: Borislav Petkov <bp@alien8.de>
To: Robert Richter <rrichter@marvell.com>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>,
	Tony Luck <tony.luck@intel.com>,
	James Morse <james.morse@arm.com>,
	Aristeu Rozanski <aris@redhat.com>,
	linux-edac@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 10/11] EDAC/ghes: Create an own device for each mci
Date: Mon, 16 Mar 2020 10:45:27 +0100
Message-ID: <20200316094527.GD26126@zn.tnic> (raw)
In-Reply-To: <20200306151318.17422-11-rrichter@marvell.com>

On Fri, Mar 06, 2020 at 04:13:17PM +0100, Robert Richter wrote:
> Each edac mc must have a unique device for identification (see
> add_mc_to_global_list()). This 1:1 mapping between parent device and
> mci is a limitation for supporting multiple instances created by the
> ghes driver. Solve this by creating an own device in between of the
> ghes parent and the mci struct, this allows a 1:n mapping between
> both.
> 
> Implement this using a platform device as this is the least possible
> effort to create and free a device. It shows up nicely in sysfs:
> 
>  # find /sys/ -name ghes_mc*
>  /sys/devices/platform/GHES.0/ghes_mc.1
>  /sys/devices/platform/GHES.0/ghes_mc.0
>  /sys/bus/platform/devices/ghes_mc.1
>  /sys/bus/platform/devices/ghes_mc.0
> 
> Signed-off-by: Robert Richter <rrichter@marvell.com>
> ---
>  drivers/edac/ghes_edac.c | 26 +++++++++++++++++++++++---
>  1 file changed, 23 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/edac/ghes_edac.c b/drivers/edac/ghes_edac.c
> index cd61b8ae49f6..64220397296e 100644
> --- a/drivers/edac/ghes_edac.c
> +++ b/drivers/edac/ghes_edac.c
> @@ -539,6 +539,8 @@ static struct acpi_platform_list plat_list[] = {
>  static struct mem_ctl_info *ghes_mc_create(struct device *dev, int mc_idx,
>  					int num_dimm)
>  {
> +	struct platform_device_info pdevinfo;
> +	struct platform_device *pdev;
>  	struct edac_mc_layer layers[1];
>  	struct mem_ctl_info *mci;
>  	struct ghes_mci *pvt;
> @@ -547,13 +549,23 @@ static struct mem_ctl_info *ghes_mc_create(struct device *dev, int mc_idx,
>  	layers[0].size = num_dimm;
>  	layers[0].is_virt_csrow = true;
>  
> +	pdevinfo	= (struct platform_device_info){
> +		.parent	= dev,
> +		.name	= "ghes_mc",
> +		.id	= mc_idx,
> +	};

You can statically allocate that one once at the top of the file and
assign ->parent and ->id each time before calling the function below.

> +
> +	pdev = platform_device_register_full(&pdevinfo);
> +	if (IS_ERR(pdev))
> +		goto fail;
> +

-- 
Regards/Gruss,
    Boris.

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

  reply index

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-06 15:13 [PATCH 00/11] EDAC/ghes: Cleanup, rework and improvement of memory reporting Robert Richter
2020-03-06 15:13 ` [PATCH 01/11] EDAC/mc: Use int type for parameters of edac_mc_alloc() Robert Richter
2020-04-06 11:38   ` Matthias Brugger
2020-03-06 15:13 ` [PATCH 02/11] EDAC/ghes: Setup DIMM label from DMI and use it in error reports Robert Richter
2020-03-06 15:13 ` [PATCH 03/11] EDAC/ghes: Remove local variable rdr_mask in ghes_edac_dmidecode() Robert Richter
2020-04-06 11:51   ` Matthias Brugger
2020-03-06 15:13 ` [PATCH 04/11] EDAC/ghes: Remove unused members of struct ghes_edac_pvt, rename it to ghes_mci Robert Richter
2020-03-06 15:13 ` [PATCH 05/11] EDAC/ghes: Cleanup struct ghes_edac_dimm_fill, rename it to ghes_dimm_fill Robert Richter
2020-03-16  9:29   ` Borislav Petkov
2020-03-06 15:13 ` [PATCH 06/11] EDAC/ghes: Carve out MC device handling into separate functions Robert Richter
2020-03-16  9:31   ` Borislav Petkov
2020-03-16 12:12     ` Robert Richter
2020-03-06 15:13 ` [PATCH 07/11] EDAC/ghes: Have a separate code path for creating the fake MC Robert Richter
2020-03-06 15:13 ` [PATCH 08/11] EDAC/ghes: Carve out code into ghes_edac_register_{one,fake}() Robert Richter
2020-03-06 15:13 ` [PATCH 09/11] EDAC/ghes: Implement DIMM mapping table for SMBIOS handles Robert Richter
2020-03-16  9:40   ` Borislav Petkov
2020-03-06 15:13 ` [PATCH 10/11] EDAC/ghes: Create an own device for each mci Robert Richter
2020-03-16  9:45   ` Borislav Petkov [this message]
2020-03-06 15:13 ` [PATCH 11/11] EDAC/ghes: Create one memory controller per physical memory array Robert Richter
2020-03-16  9:51   ` Borislav Petkov
2020-03-17 16:34     ` John Garry
2020-03-17 22:14       ` Kani, Toshi
2020-03-17 22:50         ` Borislav Petkov
2020-03-17 22:53           ` Kani, Toshi
2020-03-18  0:10             ` Robert Richter
2020-03-24 11:32       ` Xiaofei Tan
2020-03-10 20:18 ` [PATCH 00/11] EDAC/ghes: Cleanup, rework and improvement of memory reporting Aristeu Rozanski

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