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Message-ID: <CAGnW=BaRuZvFYCz0=s_ENn_sbH4YPxZiHt1x4GvRcUAyO0s+Jw@mail.gmail.com>
Date: Tue, 2 Dec 2014 10:51:22 +0530
From: punnaiah choudary kalluri <punnaia@...inx.com>
To: Borislav Petkov <bp@...en8.de>
Cc: Punnaiah Choudary Kalluri <punnaiah.choudary.kalluri@...inx.com>,
dougthompson@...ssion.com,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
linux-arm-kernel@...ts.infradead.org,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
linux-edac@...r.kernel.org,
"michal.simek@...inx.com" <michal.simek@...inx.com>,
"robh+dt@...nel.org" <robh+dt@...nel.org>,
"pawel.moll@....com" <pawel.moll@....com>,
"mark.rutland@....com" <mark.rutland@....com>,
"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>,
Rob Landley <rob@...dley.net>,
Punnaiah Choudary <kpc528@...il.com>
Subject: Re: [PATCH v6] edac: synps: Added EDAC support for zynq ddr ecc controller
Hi Boris
On Mon, Dec 1, 2014 at 11:56 PM, Borislav Petkov <bp@...en8.de> wrote:
> On Mon, Dec 01, 2014 at 09:35:09PM +0530, Punnaiah Choudary Kalluri wrote:
>> Added EDAC support for reporting the ecc errors of synopsys ddr controller.
>> The ddr ecc controller corrects single bit errors and detects double bit
>> errors.
>>
>> Signed-off-by: Punnaiah Choudary Kalluri <punnaia@...inx.com>
>> ---
>> Changes for v6:
>> - Fixed indentation and typo errors
>> - Corrected the function and structure headers
>> Changes for v5:
>> - Removed dt binding info as already there is a binding info available
>> under memorycontroller. so, updated ecc info there.
>> - corrected the ip version and function return types
>> Changes for v4:
>> - Shorten the macro definitions
>> - Corrected the ddr ip version
>> - Reverted the file name change
>> Changes for v3:
>> - Updated maintainer information
>> - Driver cleanup as per the review comments
>> - Shortened the prefix "sysnopsys" to "synps"
>> Changes for v2:
>> - Updated the commit header and message
>> - Renamed the filenames to synopsys_edac
>> - Corrected the compatilble string, commnets
>> - Renamed the macros,fucntions and data structures
>> ---
>> MAINTAINERS | 1 +
>> drivers/edac/Kconfig | 7 +
>> drivers/edac/Makefile | 1 +
>> drivers/edac/synopsys_edac.c | 542 ++++++++++++++++++++++++++++++++++++++++++
>> 4 files changed, 551 insertions(+), 0 deletions(-)
>> create mode 100644 drivers/edac/synopsys_edac.c
>>
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index 0ff630d..7601298 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -1556,6 +1556,7 @@ N: xilinx
>> F: drivers/clocksource/cadence_ttc_timer.c
>> F: drivers/i2c/busses/i2c-cadence.c
>> F: drivers/mmc/host/sdhci-of-arasan.c
>> +F: drivers/edac/synopsys_edac.c
>>
>> ARM SMMU DRIVER
>> M: Will Deacon <will.deacon@....com>
>> diff --git a/drivers/edac/Kconfig b/drivers/edac/Kconfig
>> index 7072c28..c6d448e 100644
>> --- a/drivers/edac/Kconfig
>> +++ b/drivers/edac/Kconfig
>> @@ -385,4 +385,11 @@ config EDAC_ALTERA_MC
>> preloader must initialize the SDRAM before loading
>> the kernel.
>>
>> +config EDAC_SYNOPSYS
>> + tristate "Synopsys DDR Memory Controller"
>> + depends on EDAC_MM_EDAC && ARCH_ZYNQ
>> + help
>> + Support for EDAC on the ECC memory used with the Synopsys DDR
>> + memory controller.
>
> Just like the other drivers:
>
> "Support for error detection and correction on the Synopsys DDR memory
> controller"
>
>> +
>> endif # EDAC
>> diff --git a/drivers/edac/Makefile b/drivers/edac/Makefile
>> index 359aa49..9b5a095 100644
>> --- a/drivers/edac/Makefile
>> +++ b/drivers/edac/Makefile
>> @@ -67,3 +67,4 @@ obj-$(CONFIG_EDAC_OCTEON_LMC) += octeon_edac-lmc.o
>> obj-$(CONFIG_EDAC_OCTEON_PCI) += octeon_edac-pci.o
>>
>> obj-$(CONFIG_EDAC_ALTERA_MC) += altera_edac.o
>> +obj-$(CONFIG_EDAC_SYNOPSYS) += synopsys_edac.o
>> diff --git a/drivers/edac/synopsys_edac.c b/drivers/edac/synopsys_edac.c
>> new file mode 100644
>> index 0000000..2a13a23
>> --- /dev/null
>> +++ b/drivers/edac/synopsys_edac.c
>> @@ -0,0 +1,542 @@
>> +/*
>> + * Synopsys DDR ECC Driver
>> + * This driver is based on ppc4xx_edac.c drivers
>> + *
>> + * Copyright (C) 2012 - 2014 Xilinx, Inc.
>> + *
>> + * This program is free software: you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License as published by
>> + * the Free Software Foundation, either version 2 of the License, or
>> + * (at your option) any later version.
>> + *
>> + * This program is distributed in the hope that it will be useful,
>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
>> + * GNU General Public License for more details.
>> + *
>> + * This file is subject to the terms and conditions of the GNU General Public
>> + * License. See the file "COPYING" in the main directory of this archive
>> + * for more details
>> + */
>> +
>> +#include <linux/edac.h>
>> +#include <linux/module.h>
>> +#include <linux/platform_device.h>
>> +
>> +#include "edac_core.h"
>> +
>> +/* Number of cs_rows needed per memory controller */
>> +#define SYNPS_EDAC_NR_CSROWS 1
>> +
>> +/* Number of channels per memory controller */
>> +#define SYNPS_EDAC_NR_CHANS 1
>> +
>> +/* Granularity of reported error in bytes */
>> +#define SYNPS_EDAC_ERR_GRAIN 1
>> +
>> +#define SYNPS_EDAC_MSG_SIZE 256
>> +
>> +#define SYNPS_EDAC_MOD_STRING "synps_edac"
>> +#define SYNPS_EDAC_MOD_VER "1"
>> +
>> +/* Synopsys DDR memory controller registers that are relevant to ECC */
>> +#define CTRL_OFST 0x0
>> +#define T_ZQ_OFST 0xA4
>> +
>> +/* ECC control register */
>> +#define ECC_CTRL_OFST 0xC4
>> +/* ECC log register */
>> +#define CE_LOG_OFST 0xC8
>> +/* ECC address register */
>> +#define CE_ADDR_OFST 0xCC
>> +/* ECC data[31:0] register */
>> +#define CE_DATA_31_0_OFST 0xD0
>> +
>> +/* Uncorrectable error info regsisters */
>> +#define UE_LOG_OFST 0xDC
>> +#define UE_ADDR_OFST 0xE0
>> +#define UE_DATA_31_0_OFST 0xE4
>> +
>> +#define STAT_OFST 0xF0
>> +#define SCRUB_OFST 0xF4
>> +
>> +/* Control regsiter bitfield definitions */
>> +#define CTRL_BW_MASK 0xC
>> +#define CTRL_BW_SHIFT 2
>> +
>> +#define DDRCTL_WDTH_16 1
>> +#define DDRCTL_WDTH_32 0
>> +
>> +/* ZQ register bitfield definitions */
>> +#define T_ZQ_DDRMODE_MASK 0x2
>> +
>> +/* ECC control register bitfield definitions */
>> +#define ECC_CTRL_CLR_CE_ERR 0x2
>> +#define ECC_CTRL_CLR_UE_ERR 0x1
>> +
>> +/* ECC correctable/uncorrectable error log register definitions */
>> +#define CE_LOG_VALID 0x1
>> +#define CE_LOG_BITPOS_MASK 0xFE
>> +#define CE_LOG_BITPOS_SHIFT 1
>> +
>> +/* ECC correctable/uncorrectable error address register definitions */
>> +#define ADDR_COL_MASK 0xFFF
>> +#define ADDR_ROW_MASK 0xFFFF000
>> +#define ADDR_ROW_SHIFT 12
>> +#define ADDR_BANK_MASK 0x70000000
>> +#define ADDR_BANK_SHIFT 28
>> +
>> +/* ECC statistic regsiter definitions */
>> +#define STAT_UECNT_MASK 0xFF
>> +#define STAT_CECNT_MASK 0xFF00
>> +#define STAT_CECNT_SHIFT 8
>> +
>> +/* ECC scrub regsiter definitions */
>> +#define SCRUB_MODE_MASK 0x7
>> +#define SCRUB_MODE_SECDED 0x4
>> +
>> +/**
>> + * struct ecc_error_info - ECC error log information
>> + * @row: Row number
>> + * @col: Column number
>> + * @bank: Bank number
>> + * @bitpos: Bit position
>> + * @data: Data causing the error
>> + */
>> +struct ecc_error_info {
>> + u32 row;
>> + u32 col;
>> + u32 bank;
>> + u32 bitpos;
>> + u32 data;
>> +};
>> +
>> +/**
>> + * struct synps_ecc_status - ECC status information to report
>> + * @ce_cnt: Correctable error count
>> + * @ue_cnt: Uncorrectable error count
>> + * @ceinfo: Correctable error log information
>> + * @ueinfo: Uncorrectable error log information
>> + */
>> +struct synps_ecc_status {
>> + u32 ce_cnt;
>> + u32 ue_cnt;
>> + struct ecc_error_info ceinfo;
>> + struct ecc_error_info ueinfo;
>> +};
>> +
>> +/**
>> + * struct synps_edac_priv - DDR memory controller private instance data
>> + * @baseaddr: Base address of the DDR controller
>> + * @ce_cnt: Correctable Error count
>> + * @ue_cnt: Uncorrectable Error count
>> + */
>> +struct synps_edac_priv {
>> + void __iomem *baseaddr;
>> + u32 ce_cnt;
>> + u32 ue_cnt;
>> +};
>> +
>> +/**
>> + * 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
>> + *
>> + * This routine determines there is any ecc error or not
>> + *
>> + * Return: one if there is no error otherwise returns zero
>> + */
>> +static int synps_edac_geterror_info(void __iomem *base,
>> + struct synps_ecc_status *p)
>> +{
>> + u32 regval;
>> + u32 clearval = 0;
>
> Put them on a single line:
>
> u32 regval, clearval = 0;
>
>> +
>> + regval = readl(base + STAT_OFST) & (STAT_UECNT_MASK | STAT_CECNT_MASK);
>> +
>
> Superfluous newline.
>
>> + if (!regval)
>> + return 1;
>> +
>> + memset(p, 0, sizeof(*p));
>
> See the comment below about when to memset this.
>
>> +
>> + p->ce_cnt = (regval & STAT_CECNT_MASK) >> STAT_CECNT_SHIFT;
>> + p->ue_cnt = regval & STAT_UECNT_MASK;
>
> This looks clumsy. Just do this instead:
>
> int ret = 0;
>
> regval = readl(base + STAT_OFST);
> p->ce_cnt = (regval & STAT_CECNT_MASK) >> STAT_CECNT_SHIFT;
> p->ue_cnt = regval & STAT_UECNT_MASK;
>
> if (pe->ce_cnt ... ) {
> __assign_error_info(CE, ...);
> ret = 1;
> }
>
> if (pe->ue_cnt ...) {
> __assign_error_info(UE, ...);
> ret = 1;
> }
>
> ...
>
> return ret;
>
> and __assign_error_info() gets the needed register values and does only
> the assignments according to the first argument which tells it what to
> assign - a CE or an UE.
>
>> +
>> + regval = readl(base + CE_LOG_OFST);
>> + if (!(p->ce_cnt && (regval & CE_LOG_VALID)))
>> + goto ue_err;
>> + p->ceinfo.bitpos = (regval & CE_LOG_BITPOS_MASK) >> CE_LOG_BITPOS_SHIFT;
>> + regval = readl(base + CE_ADDR_OFST);
>> + p->ceinfo.row = (regval & ADDR_ROW_MASK) >> ADDR_ROW_SHIFT;
>> + p->ceinfo.col = regval & ADDR_COL_MASK;
>> + p->ceinfo.bank = (regval & ADDR_BANK_MASK) >> ADDR_BANK_SHIFT;
>> + p->ceinfo.data = readl(base + CE_DATA_31_0_OFST);
>
> Right so this [*] ...
>
>> + edac_dbg(3, "ce bitposition: %d data: %d\n", p->ceinfo.bitpos,
>> + p->ceinfo.data);
>> + clearval = ECC_CTRL_CLR_CE_ERR;
>> +
>> +ue_err:
>> + regval = readl(base + UE_LOG_OFST);
>> + if (!(p->ue_cnt && (regval & CE_LOG_VALID)))
>> + goto out;
>
> This is funny: you do test CE_LOG_VALID here for UE and above for CE
> errors. If it is the same bit, just call it ERR_VALID so that it is
> clear.
>
>> +
>> + regval = readl(base + UE_ADDR_OFST);
>> + p->ueinfo.row = (regval & ADDR_ROW_MASK) >> ADDR_ROW_SHIFT;
>> + p->ueinfo.col = regval & ADDR_COL_MASK;
>> + p->ueinfo.bank = (regval & ADDR_BANK_MASK) >> ADDR_BANK_SHIFT;
>> + p->ueinfo.data = readl(base + UE_DATA_31_0_OFST);
>
> ... [*] and this looks pretty similar and could be carved out in a
> __assign_error_info() function.
>
> Also, you can slim down struct synps_ecc_status by having a single
> struct ecc_error_info embedded in there and a flag which says what type
> of error this struct is carrying.
>
> Or is it technically possible to have both a CE and an UE coming out of
> the hardware so that you want to carry two errors at the same time?
>
> In any case, you can split this synps_edac_geterror_info() function into
> a helper which assigns to the different p-> fields and you hand-in only
> the regvals you've read before, i.e. the __assign_error_info() example
> above.
>
>> + clearval |= ECC_CTRL_CLR_UE_ERR;
>> +
>> +out:
>> + writel(clearval, base + ECC_CTRL_OFST);
>> + writel(0x0, base + ECC_CTRL_OFST);
>> +
>> + return 0;
>> +}
>> +
>> +/**
>> + * synps_edac_handle_error - Handle controller error types CE and UE
>> + * @mci: Pointer to the edac memory controller instance
>> + * @p: Pointer to the synopsys ecc status structure
>> + *
>> + * This routine handles the controller ECC correctable and un correctable
>> + * error.
>> + */
>> +static void synps_edac_handle_error(struct mem_ctl_info *mci,
>> + struct synps_ecc_status *p)
>> +{
>> + char message[SYNPS_EDAC_MSG_SIZE];
>
> You could preallocate this on driver init so you don't do relatively big
> stack allocations on the error reporting path and remain lean.
>
>> + struct ecc_error_info *pinf;
>> +
>> + if (p->ce_cnt) {
>> + pinf = &p->ceinfo;
>> + snprintf(message, SYNPS_EDAC_MSG_SIZE,
>> + "DDR ECC error type :%s Row %d Bank %d Col %d ",
>> + "CE", pinf->row, pinf->bank, pinf->col);
>> + edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci,
>> + p->ce_cnt, 0, 0, 0, 0, 0, -1,
>> + message, "");
>> + }
>> +
>> + if (p->ue_cnt) {
>> + pinf = &p->ueinfo;
>> + snprintf(message, SYNPS_EDAC_MSG_SIZE,
>> + "DDR ECC error type :%s Row %d Bank %d Col %d ",
>> + "UE", pinf->row, pinf->bank, pinf->col);
>> + edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci,
>> + p->ue_cnt, 0, 0, 0, 0, 0, -1,
>> + message, "");
>> + }
>
> If you memset(p, 0,...) here, after consumption, you don't need to do it
> anywhere else and be sure that *p would be always clean and ready for
> the next error.
>
>> +}
>> +
>> +/**
>> + * synps_edac_check - Check controller for ECC errors
>> + * @mci: Pointer to the edac memory controller instance
>> + *
>> + * This routine is used to check and post ECC errors and is called by
>
> All those comments start with the boilerplate "This rounine is
> blabla...". Just write only the "blabla... " :) In this particular case:
>
> "Check and post ECC errors. Called by the polling thread."
>
> Much faster to read :)
>
>> + * the EDAC polling thread
>> + */
>> +static void synps_edac_check(struct mem_ctl_info *mci)
>> +{
>> + struct synps_edac_priv *priv = mci->pvt_info;
>> + struct synps_ecc_status stat;
>> + int status;
>> +
>> + status = synps_edac_geterror_info(priv->baseaddr, &stat);
>> + if (status)
>> + return;
>> +
>> + priv->ce_cnt += stat.ce_cnt;
>> + priv->ue_cnt += stat.ue_cnt;
>> + synps_edac_handle_error(mci, &stat);
>> +
>> + edac_dbg(3, "Total error count ce %d ue %d\n",
>> + priv->ce_cnt, priv->ue_cnt);
>> +}
>> +
>> +/**
>> + * synps_edac_get_dtype - Return the controller memory width
>> + * @base: Pointer to the ddr memory contoller base address
>> + *
>> + * This routine returns the EDAC device type width appropriate for the
>> + * current controller configuration.
>> + *
>> + * Return: a device type width enumeration.
>> + */
>> +static enum dev_type synps_edac_get_dtype(const void __iomem *base)
>> +{
>> + enum dev_type dt;
>> + u32 width;
>> +
>> + width = readl(base + CTRL_OFST);
>> + width = (width & CTRL_BW_MASK) >> CTRL_BW_SHIFT;
>> +
>> + switch (width) {
>> + case DDRCTL_WDTH_16:
>> + dt = DEV_X2;
>> + break;
>> + case DDRCTL_WDTH_32:
>> + dt = DEV_X4;
>> + break;
>> + default:
>> + dt = DEV_UNKNOWN;
>> + }
>> +
>> + return dt;
>> +}
>> +
>> +/**
>> + * synps_edac_get_eccstate - Return the controller ecc enable/disable status
>> + * @base: Pointer to the ddr memory contoller base address
>> + *
>> + * This routine returns the ECC enable/disable status for the controller
>> + *
>> + * Return: a ecc status boolean i.e true/false - enabled/disabled.
>> + */
>> +static bool synps_edac_get_eccstate(void __iomem *base)
>> +{
>> + enum dev_type dt;
>> + u32 ecctype;
>> + bool state = false;
>> +
>> + dt = synps_edac_get_dtype(base);
>> + if (dt == DEV_UNKNOWN)
>> + return state;
>> +
>> + ecctype = readl(base + SCRUB_OFST) & SCRUB_MODE_MASK;
>> +
>> + if ((ecctype == SCRUB_MODE_SECDED) && (dt == DEV_X2)) {
>> + state = true;
>> + writel(0x0, base + ECC_CTRL_OFST);
>
> Out of curiosity, why is that register write needed here? Maybe
> forgotten? It looks unbalanced...
This is needed to start capturing the correctable and uncorrectable errors.
Writing 1 to this register bits will clear the counters and writing 0 will start
the counters.
>
>> + }
>> +
>> + return state;
>> +}
>> +
>> +/**
>> + * synps_edac_get_memsize - reads the size of the attached memory device
>> + *
>> + * Return: the memory size in bytes
>> + */
>> +static u32 synps_edac_get_memsize(void)
>> +{
>> + struct sysinfo inf;
>> +
>> + si_meminfo(&inf);
>> +
>> + return inf.totalram * inf.mem_unit;
>> +}
>> +
>> +/**
>> + * synps_edac_get_mtype - Returns controller memory type
>> + * @base: pointer to the synopsys ecc status structure
>> + *
>> + * This routine returns the EDAC memory type appropriate for the
>> + * current controller configuration.
>> + *
>> + * Return: a memory type enumeration.
>> + */
>> +static enum mem_type synps_edac_get_mtype(const void __iomem *base)
>> +{
>> + enum mem_type mt;
>> + u32 memtype;
>> +
>> + memtype = readl(base + T_ZQ_OFST);
>> +
>> + if (memtype & T_ZQ_DDRMODE_MASK)
>> + mt = MEM_DDR3;
>> + else
>> + mt = MEM_DDR2;
>> +
>> + return mt;
>> +}
>> +
>> +/**
>> + * synps_edac_init_csrows - Initialize the cs row data
>> + * @mci: Pointer to the edac memory controller instance
>> + *
>> + * This routine initializes the chip select rows associated
>> + * with the EDAC memory controller instance
>> + *
>> + * Return: Unconditionally 0.
>> + */
>> +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;
>> + u32 size;
>> + int row, j;
>> +
>> + for (row = 0; row < mci->nr_csrows; row++) {
>> + csi = mci->csrows[row];
>> + 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;
>
> No need for the linebreak here, even if it sticks out of 80 cols. The
> break is uglier.
It is crossing 80 cols. so, there is line break here. I feel the other
way as the check patch
throws warning for this.
I will fix all the comments and send you the next version.Thanks for the review.
Regards,
Punnaiah
>
> You could even align on the "=" signs for even better readability.
>
>> + dimm->grain = SYNPS_EDAC_ERR_GRAIN;
>> + dimm->dtype = synps_edac_get_dtype(priv->baseaddr);
>> + }
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +/**
>> + * synps_edac_mc_init - Initialize driver instance
>> + * @mci: Pointer to the edac memory controller instance
>> + * @pdev: Pointer to the platform_device struct
>> + *
>> + * This routine performs initialization of the EDAC memory controller
>> + * instance and related driver-private data associated with the
>> + * memory controller the instance is bound to.
>> + *
>> + * Return: 0 if OK; otherwise, < 0 on error.
>
> Where do we even return < 0 since synps_edac_init_csrows() returns
> "Unconditionally 0." ?
>
>> + */
>> +static int synps_edac_mc_init(struct mem_ctl_info *mci,
>> + struct platform_device *pdev)
>> +{
>> + int status;
>> + struct synps_edac_priv *priv;
>> +
>> + mci->pdev = &pdev->dev;
>> + priv = mci->pvt_info;
>> + platform_set_drvdata(pdev, mci);
>> +
>> + /* Initialize controller capabilities and configuration */
>> + mci->mtype_cap = MEM_FLAG_DDR3 | MEM_FLAG_DDR2;
>> + mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
>> + mci->scrub_cap = SCRUB_HW_SRC;
>> + mci->scrub_mode = SCRUB_NONE;
>> +
>> + mci->edac_cap = EDAC_FLAG_SECDED;
>> + mci->ctl_name = "synps_ddr_controller";
>> + mci->dev_name = SYNPS_EDAC_MOD_STRING;
>> + mci->mod_name = SYNPS_EDAC_MOD_VER;
>> + mci->mod_ver = "1";
>> +
>> + edac_op_state = EDAC_OPSTATE_POLL;
>> + mci->edac_check = synps_edac_check;
>> + mci->ctl_page_to_phys = NULL;
>> +
>> + /*
>> + * Initialize the MC control structure 'csrows' table
>> + * with the mapping and control information.
>> + */
>
> That is too much and too obvious a comment.
>
>> + status = synps_edac_init_csrows(mci);
>> +
>> + return status;
>> +}
>> +
>> +/**
>> + * synps_edac_mc_probe - Check controller and bind driver
>> + * @pdev: Pointer to the platform_device struct
>> + *
>> + * This routine probes a specific controller
>> + * instance for binding with the driver.
>
> Ditto.
>
>> + *
>> + * Return: 0 if the controller instance was successfully bound to the
>> + * driver; otherwise, < 0 on error.
>> + */
>> +static int synps_edac_mc_probe(struct platform_device *pdev)
>> +{
>> + struct mem_ctl_info *mci;
>> + struct edac_mc_layer layers[2];
>> + struct synps_edac_priv *priv;
>> + int rc;
>> + struct resource *res;
>> + void __iomem *baseaddr;
>> +
>> + 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) == false) {
>
> if (!synps_edac_get_eccstate(...)) {
>
>> + edac_printk(KERN_INFO, EDAC_MC, "ECC not enabled\n");
>> + return -ENXIO;
>> + }
>> +
>> + layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
>> + layers[0].size = SYNPS_EDAC_NR_CSROWS;
>> + layers[0].is_virt_csrow = true;
>> + layers[1].type = EDAC_MC_LAYER_CHANNEL;
>> + layers[1].size = SYNPS_EDAC_NR_CHANS;
>> + layers[1].is_virt_csrow = false;
>> +
>> + mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers,
>> + sizeof(struct synps_edac_priv));
>> + if (!mci) {
>> + edac_printk(KERN_ERR, EDAC_MC,
>> + "Failed memory allocation for mc instance\n");
>> + return -ENOMEM;
>> + }
>> +
>> + priv = mci->pvt_info;
>> + priv->baseaddr = baseaddr;
>> + rc = synps_edac_mc_init(mci, pdev);
>> + if (rc) {
>> + edac_printk(KERN_ERR, EDAC_MC,
>> + "Failed to initialize instance\n");
>> + goto free_edac_mc;
>> + }
>> +
>> + rc = edac_mc_add_mc(mci);
>> + if (rc) {
>> + edac_printk(KERN_ERR, EDAC_MC,
>> + "Failed to register with EDAC core\n");
>> + goto del_edac_mc;
>
> This should be free_edac_mc as you do edac_mc_del_mc() only if
> edac_mc_add_mc() has succeeded.
>
> --
> Regards/Gruss,
> Boris.
>
> Sent from a fat crate under my desk. Formatting is fine.
> --
--
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