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Date: Tue, 4 Sep 2018 18:58:28 +0200
From: Borislav Petkov <bp@...en8.de>
To: Manish Narani <manish.narani@...inx.com>
Cc: robh+dt@...nel.org, mark.rutland@....com, michal.simek@...inx.com,
mchehab@...nel.org, leoyang.li@....com, amit.kucheria@...aro.org,
olof@...om.net, sgoud@...inx.com, anirudh@...inx.com,
linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-edac@...r.kernel.org
Subject: Re: [PATCH v5 1/4] edac: synps: Add platform specific structures for
ddrc controller
On Fri, Aug 31, 2018 at 06:57:47PM +0530, Manish Narani wrote:
> Add platform specific structures, so that we can add different IP
> support later using quirks.
>
> Signed-off-by: Manish Narani <manish.narani@...inx.com>
> ---
> drivers/edac/synopsys_edac.c | 78 +++++++++++++++++++++++++++++++++-----------
> 1 file changed, 59 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/edac/synopsys_edac.c b/drivers/edac/synopsys_edac.c
> index 0c9c59e..2470d35 100644
> --- a/drivers/edac/synopsys_edac.c
> +++ b/drivers/edac/synopsys_edac.c
> @@ -22,6 +22,8 @@
> #include <linux/edac.h>
> #include <linux/module.h>
> #include <linux/platform_device.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
>
> #include "edac_module.h"
>
> @@ -130,6 +132,7 @@ struct synps_ecc_status {
> * @baseaddr: Base address of the DDR controller
> * @message: Buffer for framing the event specific info
> * @stat: ECC status information
> + * @p_data: Pointer to platform data
> * @ce_cnt: Correctable Error count
> * @ue_cnt: Uncorrectable Error count
> */
> @@ -137,24 +140,47 @@ struct synps_edac_priv {
> void __iomem *baseaddr;
> char message[SYNPS_EDAC_MSG_SIZE];
> struct synps_ecc_status stat;
> + const struct synps_platform_data *p_data;
> u32 ce_cnt;
> u32 ue_cnt;
> };
>
> /**
> + * struct synps_platform_data - synps platform data structure
> + * @edac_geterror_info: function pointer to synps edac error info
> + * @edac_get_mtype: function pointer to synps edac mtype
> + * @edac_get_dtype: function pointer to synps edac dtype
> + * @edac_get_eccstate: function pointer to synps edac eccstate
> + * @quirks: to differentiate IPs
Kill all that "function pointer" fluff. Here's how I've changed it:
/**
* struct synps_platform_data - synps platform data structure
* @edac_geterror_info: edac error info
* @edac_get_mtype: get mtype
* @edac_get_dtype: get dtype
* @edac_get_eccstate: get ECC state
* @quirks: to differentiate IPs
*/
Shorter, quicker to read/scan/etc...
> + */
> +struct synps_platform_data {
> + int (*edac_geterror_info)(struct synps_edac_priv *priv);
> + enum mem_type (*edac_get_mtype)(const void __iomem *base);
> + enum dev_type (*edac_get_dtype)(const void __iomem *base);
> + bool (*edac_get_eccstate)(void __iomem *base);
> + int quirks;
> +};
> +
> +/**
> * synps_edac_geterror_info - Get the current ecc error info
> - * @base: Pointer to the base address of the ddr memory controller
> - * @p: Pointer to the synopsys ecc status structure
> + * @priv: Pointer to DDR memory controller private instance data
> *
> * Determines there is any ecc error or not
All sentences end with a fullstop. Check all your patches.
Also, it is not "ecc" it is "ECC". Also go over all your patches.
> *
> * Return: one if there is no error otherwise returns zero
> */
> -static int synps_edac_geterror_info(void __iomem *base,
> - struct synps_ecc_status *p)
> +static int synps_edac_geterror_info(struct synps_edac_priv *priv)
> {
> + void __iomem *base;
> + struct synps_ecc_status *p;
> u32 regval, clearval = 0;
Please sort function local variables declaration in a reverse christmas
tree order:
<type> longest_variable_name;
<type> shorter_var_name;
<type> even_shorter;
<type> i;
>
> + if (!priv)
> + return 1;
Why are you even checking this here?
synps_edac_check() is merrily dereferencing it - if anything we will
explode there already.
> +
> + base = priv->baseaddr;
> + p = &priv->stat;
> +
> regval = readl(base + STAT_OFST);
> if (!regval)
> return 1;
> @@ -240,9 +266,10 @@ static void synps_edac_handle_error(struct mem_ctl_info *mci,
> static void synps_edac_check(struct mem_ctl_info *mci)
> {
> struct synps_edac_priv *priv = mci->pvt_info;
> + const struct synps_platform_data *p_data = priv->p_data;
> int status;
>
> - status = synps_edac_geterror_info(priv->baseaddr, &priv->stat);
> + status = p_data->edac_geterror_info(priv);
> if (status)
> return;
>
> @@ -362,6 +389,7 @@ static int synps_edac_init_csrows(struct mem_ctl_info *mci)
> struct csrow_info *csi;
> struct dimm_info *dimm;
> struct synps_edac_priv *priv = mci->pvt_info;
> + const struct synps_platform_data *p_data = priv->p_data;
> u32 size;
> int row, j;
>
> @@ -370,12 +398,12 @@ static int synps_edac_init_csrows(struct mem_ctl_info *mci)
That function returns 0 unconditionally. Make it a void in a prepatch.
> size = synps_edac_get_memsize();
>
> for (j = 0; j < csi->nr_channels; j++) {
> - dimm = csi->channels[j]->dimm;
> - dimm->edac_mode = EDAC_FLAG_SECDED;
> - dimm->mtype = synps_edac_get_mtype(priv->baseaddr);
> - dimm->nr_pages = (size >> PAGE_SHIFT) / csi->nr_channels;
> - dimm->grain = SYNPS_EDAC_ERR_GRAIN;
> - dimm->dtype = synps_edac_get_dtype(priv->baseaddr);
> + dimm = csi->channels[j]->dimm;
> + dimm->edac_mode = EDAC_FLAG_SECDED;
> + dimm->mtype = p_data->edac_get_mtype(priv->baseaddr);
> + dimm->nr_pages = (size >> PAGE_SHIFT) / csi->nr_channels;
> + dimm->grain = SYNPS_EDAC_ERR_GRAIN;
> + dimm->dtype = p_data->edac_get_dtype(priv->baseaddr);
> }
> }
>
> @@ -423,6 +451,21 @@ static int synps_edac_mc_init(struct mem_ctl_info *mci,
> return status;
> }
>
> +static const struct synps_platform_data zynq_edac_def = {
> + .edac_geterror_info = synps_edac_geterror_info,
> + .edac_get_mtype = synps_edac_get_mtype,
> + .edac_get_dtype = synps_edac_get_dtype,
> + .edac_get_eccstate = synps_edac_get_eccstate,
> + .quirks = 0,
> +};
> +
> +static const struct of_device_id synps_edac_match[] = {
> + { .compatible = "xlnx,zynq-ddrc-a05", .data = (void *)&zynq_edac_def },
> + { /* end of table */ }
> +};
> +
> +MODULE_DEVICE_TABLE(of, synps_edac_match);
> +
> /**
> * synps_edac_mc_probe - Check controller and bind driver
> * @pdev: Pointer to the platform_device struct
> @@ -440,13 +483,15 @@ static int synps_edac_mc_probe(struct platform_device *pdev)
> int rc;
> struct resource *res;
> void __iomem *baseaddr;
> + const struct synps_platform_data *p_data;
Please sort function local variables declaration in a reverse christmas
tree order:
<type> longest_variable_name;
<type> shorter_var_name;
<type> even_shorter;
<type> i;
>
> res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> baseaddr = devm_ioremap_resource(&pdev->dev, res);
> if (IS_ERR(baseaddr))
> return PTR_ERR(baseaddr);
>
> - if (!synps_edac_get_eccstate(baseaddr)) {
> + p_data = of_device_get_match_data(&pdev->dev);
> + if (!(p_data->edac_get_eccstate(baseaddr))) {
Too many parentheses:
if (!p_data->...
is enough.
--
Regards/Gruss,
Boris.
Good mailing practices for 400: avoid top-posting and trim the reply.
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