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Date: Sun, 13 Aug 2017 13:35:16 +0200
From: Borislav Petkov <bp@...en8.de>
To: Michal Simek <michal.simek@...inx.com>
Cc: linux-kernel@...r.kernel.org, monstr@...str.eu,
Naga Sureshkumar Relli <naga.sureshkumar.relli@...inx.com>,
Sören Brinkmann <soren.brinkmann@...inx.com>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
linux-arm-kernel@...ts.infradead.org, linux-edac@...r.kernel.org
Subject: Re: [PATCH v2 2/6] edac: synopsys: Add platform specific structures
for ddrc controller
On Mon, Aug 07, 2017 at 09:39:24AM +0200, Michal Simek wrote:
> From: Naga Sureshkumar Relli <naga.sureshkumar.relli@...inx.com>
>
> Adds platform specific structures, so that we can add
"Add platform-specific structures, ..."
i.e., "Do this and do that" formulation. Fix that in the following
patches too pls.
> different IP support later using quirks.
>
> Signed-off-by: Naga Sureshkumar Relli <nagasure@...inx.com>
> Signed-off-by: Michal Simek <michal.simek@...inx.com>
> ---
>
> Changes in v2:
> - Update commit message
> - Update patch subject
> - Update kernel-doc description for struct synps_platform_data
> - Change synps_platform_data pointer names and update code
>
> drivers/edac/synopsys_edac.c | 70 ++++++++++++++++++++++++++++++++++++--------
> 1 file changed, 58 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/edac/synopsys_edac.c b/drivers/edac/synopsys_edac.c
> index 0c9c59e2b5a3..293380f884fe 100644
> --- a/drivers/edac/synopsys_edac.c
> +++ b/drivers/edac/synopsys_edac.c
> @@ -22,6 +22,7 @@
> #include <linux/edac.h>
> #include <linux/module.h>
> #include <linux/platform_device.h>
> +#include <linux/of.h>
>
> #include "edac_module.h"
>
> @@ -95,6 +96,9 @@
> #define SCRUB_MODE_MASK 0x7
> #define SCRUB_MODE_SECDED 0x4
>
> +/* DDR ECC Quirks */
quirks?
How is reporting ECC with an interrupt a quirk? Or whatever that define
is...
> +#define DDR_ECC_INTR_SUPPORT BIT(0)
> +
> /**
> * struct ecc_error_info - ECC error log information
> * @row: Row number
> @@ -130,6 +134,7 @@ 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
> */
> @@ -137,11 +142,29 @@ 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 which returns the current ecc error info
> + * @edac_get_mtype: function which returns the memory type
> + * @edac_get_dtype: function which returns the DIMM type
> + * @edac_get_eccstate: function which returns the ecc enable/disable status
> + * @quirks: a bitfield of quirks
> + */
> +struct synps_platform_data {
> + int (*edac_geterror_info)(void __iomem *base,
> + struct synps_ecc_status *p);
> + 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;
You can just as well drop the "edac_" prefix too - those are
driver-local things and not EDAC-core.
> +};
> +
> +/**
> * 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
> @@ -242,7 +265,8 @@ static void synps_edac_check(struct mem_ctl_info *mci)
> struct synps_edac_priv *priv = mci->pvt_info;
> int status;
>
> - status = synps_edac_geterror_info(priv->baseaddr, &priv->stat);
> + status = priv->p_data->edac_geterror_info(priv->baseaddr,
> + &priv->stat);
> if (status)
> return;
>
> @@ -372,10 +396,12 @@ static int synps_edac_init_csrows(struct mem_ctl_info *mci)
> 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->mtype = priv->p_data->edac_get_mtype(
> + priv->baseaddr);
Always let it stick out, never break on the opening brace. checkpatch
should catch that but it doesn't, for some reason.
> dimm->nr_pages = (size >> PAGE_SHIFT) / csi->nr_channels;
> dimm->grain = SYNPS_EDAC_ERR_GRAIN;
> - dimm->dtype = synps_edac_get_dtype(priv->baseaddr);
> + dimm->dtype = priv->p_data->edac_get_dtype(
> + priv->baseaddr);
> }
> }
>
> @@ -423,6 +449,21 @@ 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,
.geterror_info = synps_geterror_info,
and so on looks perfectly fine to me.
> + .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 +481,22 @@ static int synps_edac_mc_probe(struct platform_device *pdev)
> int rc;
> struct resource *res;
> void __iomem *baseaddr;
> + const struct of_device_id *match;
> + const struct synps_platform_data *p_data;
>
> 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)) {
> + match = of_match_node(synps_edac_match, pdev->dev.of_node);
> + if (!match && !match->data) {
> + dev_err(&pdev->dev, "of_match_node() failed\n");
> + return -EINVAL;
> + }
> +
> + p_data = (struct synps_platform_data *)match->data;
> + if (!(p_data->edac_get_eccstate(baseaddr))) {
This patch does more than just adding platform-specific structures and
the commit message is not talking about it.
> edac_printk(KERN_INFO, EDAC_MC, "ECC not enabled\n");
> return -ENXIO;
> }
> @@ -468,6 +518,8 @@ static int synps_edac_mc_probe(struct platform_device *pdev)
>
> priv = mci->pvt_info;
> priv->baseaddr = baseaddr;
> + priv->p_data = match->data;
> +
> rc = synps_edac_mc_init(mci, pdev);
> if (rc) {
> edac_printk(KERN_ERR, EDAC_MC,
> @@ -486,7 +538,8 @@ static int synps_edac_mc_probe(struct platform_device *pdev)
> * Start capturing the correctable and uncorrectable errors. A write of
> * 0 starts the counters.
> */
> - writel(0x0, baseaddr + ECC_CTRL_OFST);
> + if (!(priv->p_data->quirks & DDR_ECC_INTR_SUPPORT))
> + writel(0x0, baseaddr + ECC_CTRL_OFST);
Ditto.
--
Regards/Gruss,
Boris.
ECO tip #101: Trim your mails when you reply.
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