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Message-ID: <20140423145436.GC25378@pd.tnic>
Date: Wed, 23 Apr 2014 16:54:36 +0200
From: Borislav Petkov <bp@...en8.de>
To: tthayer@...era.com
Cc: robherring2@...il.com, pawel.moll@....com, mark.rutland@....com,
ijc+devicetree@...lion.org, galak@...eaurora.org, rob@...dley.net,
linux@....linux.org.uk, dinguyen@...era.com,
dougthompson@...ssion.com, grant.likely@...aro.org,
tthayer.linux@...il.com, devicetree@...r.kernel.org,
linux-edac@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2 3/3] edac: altera: Add SDRAM EDAC support for
CycloneV/ArriaV
On Tue, Apr 15, 2014 at 06:30:10PM -0500, tthayer@...era.com wrote:
> From: Thor Thayer <tthayer@...era.com>
>
> Added EDAC support for reporting ECC errors of CycloneV
> and ArriaV SDRAM controller.
> - The SDRAM Controller registers are used by the FPGA bridge so
> these are accessed through the syscon interface.
> - The configuration of the SDRAM memory size for the EDAC framework
> is discovered from the SDRAM Controller registers.
> - Documentation of the bindings in devicetree/bindings/arm/altera/
> socfpga-sdram-edac.txt
> - Correction of single bit errors, detection of double bit errors.
>
> ---
> v2: Use the SDRAM controller registers to calculate memory size
> instead of the Device Tree. Update To & Cc list. Add maintainer
> information.
>
> Signed-off-by: Thor Thayer <tthayer@...era.com>
> To: Rob Herring <robherring2@...il.com>
> To: Doug Thompson <dougthompson@...ssion.com>
> To: Grant Likely <grant.likely@...aro.org>
> To: Pawel Moll <pawel.moll@....com>
> To: Mark Rutland <mark.rutland@....com>
> To: Ian Campbell <ijc+devicetree@...lion.org.uk>
> To: Kumar Gala <galak@...eaurora.org>
> To: Rob Landley <rob@...dley.net>
> To: Russell King <linux@....linux.org.uk>
> To: Dinh Nguyen <dinguyen@...era.com>
> Cc: Borislav Petkov <bp@...en8.de>
> Cc: devicetree@...r.kernel.org
> Cc: linux-edac@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> ---
> MAINTAINERS | 5 +
> drivers/edac/Kconfig | 9 +
> drivers/edac/Makefile | 2 +
> drivers/edac/altera_mc_edac.c | 393 +++++++++++++++++++++++++++++++++++++++++
> 4 files changed, 409 insertions(+)
> create mode 100644 drivers/edac/altera_mc_edac.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index b8af16d..aee0746 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -1249,6 +1249,11 @@ M: Dinh Nguyen <dinguyen@...era.com>
> S: Maintained
> F: drivers/clk/socfpga/
>
> +ARM/SOCFPGA SDRAM EDAC SUPPORT
> +M: Thor Thayer <tthayer@...era.com>
> +S: Maintained
> +F: drivers/edac/altera_mc_edac.c
> +
> ARM/STI ARCHITECTURE
> M: Srinivas Kandagatla <srinivas.kandagatla@...com>
> M: Stuart Menefy <stuart.menefy@...com>
> diff --git a/drivers/edac/Kconfig b/drivers/edac/Kconfig
> index 878f090..4f4d379 100644
> --- a/drivers/edac/Kconfig
> +++ b/drivers/edac/Kconfig
> @@ -368,4 +368,13 @@ config EDAC_OCTEON_PCI
> Support for error detection and correction on the
> Cavium Octeon family of SOCs.
>
> +config EDAC_ALTERA_MC
> + bool "Altera SDRAM Memory Controller EDAC"
> + depends on EDAC_MM_EDAC && ARCH_SOCFPGA
> + help
> + Support for error detection and correction on the
> + Altera SDRAM memory controller. Note that the
> + preloader must initialize the SDRAM before loading
> + the kernel.
> +
> endif # EDAC
> diff --git a/drivers/edac/Makefile b/drivers/edac/Makefile
> index 4154ed6..e15d05f 100644
> --- a/drivers/edac/Makefile
> +++ b/drivers/edac/Makefile
> @@ -64,3 +64,5 @@ obj-$(CONFIG_EDAC_OCTEON_PC) += octeon_edac-pc.o
> obj-$(CONFIG_EDAC_OCTEON_L2C) += octeon_edac-l2c.o
> obj-$(CONFIG_EDAC_OCTEON_LMC) += octeon_edac-lmc.o
> obj-$(CONFIG_EDAC_OCTEON_PCI) += octeon_edac-pci.o
> +
> +obj-$(CONFIG_EDAC_ALTERA_MC) += altera_mc_edac.o
> diff --git a/drivers/edac/altera_mc_edac.c b/drivers/edac/altera_mc_edac.c
> new file mode 100644
> index 0000000..811b712
> --- /dev/null
> +++ b/drivers/edac/altera_mc_edac.c
> @@ -0,0 +1,393 @@
> +/*
> + * Copyright Altera Corporation (C) 2014. All rights reserved.
> + * Copyright 2011-2012 Calxeda, Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms and conditions of the GNU General Public License,
> + * version 2, as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope 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.
> + *
> + * You should have received a copy of the GNU General Public License along with
> + * this program. If not, see <http://www.gnu.org/licenses/>.
Please drop this boilerplate and point to COPYING in a single sentence
stating that it is licensed under GPLv2.
> + *
> + * Adapted from the highbank_mc_edac driver
> + *
> + */
> +#include <linux/types.h>
> +#include <linux/kernel.h>
> +#include <linux/ctype.h>
> +#include <linux/edac.h>
> +#include <linux/interrupt.h>
> +#include <linux/platform_device.h>
> +#include <linux/of_platform.h>
> +#include <linux/uaccess.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/regmap.h>
> +
> +#include "edac_core.h"
> +#include "edac_module.h"
> +
> +#define ALTR_EDAC_MOD_STR "altera_edac"
and yet the filename is called altera_mc_edac.c. Please change it to
altera_edac.c too.
> +
> +/* SDRAM Controller CtrlCfg Register */
> +#define ALTR_SDR_CTLCFG 0x00
> +
> +/* SDRAM Controller CtrlCfg Register Bit Masks */
> +#define ALTR_SDR_CTLCFG_ECC_EN 0x400
> +#define ALTR_SDR_CTLCFG_ECC_CORR_EN 0x800
> +#define ALTR_SDR_CTLCFG_GEN_SB_ERR 0x2000
> +#define ALTR_SDR_CTLCFG_GEN_DB_ERR 0x4000
> +
> +#define ALTR_SDR_CTLCFG_ECC_AUTO_EN (ALTR_SDR_CTLCFG_ECC_EN | \
> + ALTR_SDR_CTLCFG_ECC_CORR_EN)
> +
> +/* SDRAM Controller Address Width Register */
> +#define ALTR_SDR_DRAMADDRW 0x2C
> +
> +/* SDRAM Controller Address Widths Field Register */
> +#define ALTR_SDR_DRAMADDRW_COLBIT_MASK 0x001F
> +#define ALTR_SDR_DRAMADDRW_COLBIT_LSB 0
> +#define ALTR_SDR_DRAMADDRW_ROWBIT_MASK 0x03E0
> +#define ALTR_SDR_DRAMADDRW_ROWBIT_LSB 5
> +#define ALTR_SDR_DRAMADDRW_BANKBIT_MASK 0x1C00
> +#define ALTR_SDR_DRAMADDRW_BANKBIT_LSB 10
> +#define ALTR_SDR_DRAMADDRW_CSBIT_MASK 0xE000
> +#define ALTR_SDR_DRAMADDRW_CSBIT_LSB 13
> +
> +/* SDRAM Controller Interface Data Width Register */
> +#define ALTR_SDR_DRAMIFWIDTH 0x30
> +
> +/* SDRAM Controller Interface Data Width Defines */
> +#define ALTR_SDR_DRAMIFWIDTH_16B_ECC 24
> +#define ALTR_SDR_DRAMIFWIDTH_32B_ECC 40
> +
> +/* SDRAM Controller DRAM Status Register */
> +#define ALTR_SDR_DRAMSTS 0x38
> +
> +/* SDRAM Controller DRAM Status Register Bit Masks */
> +#define ALTR_SDR_DRAMSTS_SBEERR 0x04
> +#define ALTR_SDR_DRAMSTS_DBEERR 0x08
> +#define ALTR_SDR_DRAMSTS_CORR_DROP 0x10
> +
> +/* SDRAM Controller DRAM IRQ Register */
> +#define ALTR_SDR_DRAMINTR 0x3C
> +
> +/* SDRAM Controller DRAM IRQ Register Bit Masks */
> +#define ALTR_SDR_DRAMINTR_INTREN 0x01
> +#define ALTR_SDR_DRAMINTR_SBEMASK 0x02
> +#define ALTR_SDR_DRAMINTR_DBEMASK 0x04
> +#define ALTR_SDR_DRAMINTR_CORRDROPMASK 0x08
> +#define ALTR_SDR_DRAMINTR_INTRCLR 0x10
> +
> +/* SDRAM Controller Single Bit Error Count Register */
> +#define ALTR_SDR_SBECOUNT 0x40
> +
> +/* SDRAM Controller Single Bit Error Count Register Bit Masks */
> +#define ALTR_SDR_SBECOUNT_MASK 0x0F
> +
> +/* SDRAM Controller Double Bit Error Count Register */
> +#define ALTR_SDR_DBECOUNT 0x44
> +
> +/* SDRAM Controller Double Bit Error Count Register Bit Masks */
> +#define ALTR_SDR_DBECOUNT_MASK 0x0F
> +
> +/* SDRAM Controller ECC Error Address Register */
> +#define ALTR_SDR_ERRADDR 0x48
> +
> +/* SDRAM Controller ECC Error Address Register Bit Masks */
> +#define ALTR_SDR_ERRADDR_MASK 0xFFFFFFFF
> +
> +/* SDRAM Controller ECC Autocorrect Drop Count Register */
> +#define ALTR_SDR_DROPCOUNT 0x4C
> +
> +/* SDRAM Controller ECC Autocorrect Drop Count Register Bit Masks */
> +#define ALTR_SDR_DROPCOUNT_MASK 0x0F
> +
> +/* SDRAM Controller ECC AutoCorrect Address Register */
> +#define ALTR_SDR_DROPADDR 0x50
> +
> +/* SDRAM Controller ECC AutoCorrect Error Address Register Bit Masks */
> +#define ALTR_SDR_DROPADDR_MASK 0xFFFFFFFF
Right, those defines are pefectly fine 'n all but they're used only
here, in thie file locally. So you probably could drop this "ALTR_SDR_"
prefix and thus make them substantially shorter and as a result, the
code more readable. It'll also shorten the code below, for example:
> + regmap_write(drvdata->mc_vbase, ALTR_SDR_DRAMINTR,
> + (ALTR_SDR_DRAMINTR_INTRCLR | ALTR_SDR_DRAMINTR_INTREN));
would become
regmap_write(drvdata->mc_vbase, DRAMINTR, (DRAMINTR_INTRCLR |
DRAMINTR_INTREN));
which one can read even with one eye opened. :-)
> +
> +/* Altera SDRAM Memory Controller data */
> +struct altr_sdram_mc_data {
> + struct regmap *mc_vbase;
> +};
> +
> +static irqreturn_t altr_sdram_mc_err_handler(int irq, void *dev_id)
> +{
> + struct mem_ctl_info *mci = dev_id;
> + struct altr_sdram_mc_data *drvdata = mci->pvt_info;
> + u32 status = 0, err_count = 0, err_addr = 0;
> +
> + /* Error Address is shared by both SBE & DBE */
> + regmap_read(drvdata->mc_vbase, ALTR_SDR_ERRADDR, &err_addr);
> +
> + regmap_read(drvdata->mc_vbase, ALTR_SDR_DRAMSTS, &status);
> +
> + if (status & ALTR_SDR_DRAMSTS_DBEERR) {
> + regmap_read(drvdata->mc_vbase, ALTR_SDR_DBECOUNT, &err_count);
> + panic("\nEDAC: [%d Uncorrectable errors @ 0x%08X]\n",
> + err_count, err_addr);
> + }
Right, ok, I guess you know what you're doing here. I'm guessing there's
no more graceful recovery than panic when encountering UEs on this
platform...
> + if (status & ALTR_SDR_DRAMSTS_SBEERR) {
> + regmap_read(drvdata->mc_vbase, ALTR_SDR_SBECOUNT, &err_count);
> + edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, err_count,
> + err_addr >> PAGE_SHIFT,
> + err_addr & ~PAGE_MASK, 0,
> + 0, 0, -1, mci->ctl_name, "");
> + }
> +
> + regmap_write(drvdata->mc_vbase, ALTR_SDR_DRAMINTR,
> + (ALTR_SDR_DRAMINTR_INTRCLR | ALTR_SDR_DRAMINTR_INTREN));
> +
> + return IRQ_HANDLED;
> +}
> +
> +#ifdef CONFIG_EDAC_DEBUG
> +static ssize_t altr_sdr_mc_err_inject_write(struct file *file,
> + const char __user *data,
> + size_t count, loff_t *ppos)
> +{
arg alignment.
> + struct mem_ctl_info *mci = file->private_data;
> + struct altr_sdram_mc_data *drvdata = mci->pvt_info;
> + u32 *ptemp;
> + dma_addr_t dma_handle;
> + u32 reg, read_reg = 0;
> +
> + ptemp = dma_alloc_coherent(mci->pdev, 16, &dma_handle, GFP_KERNEL);
> + if (IS_ERR(ptemp)) {
> + dma_free_coherent(mci->pdev, 16, ptemp, dma_handle);
> + dev_err(mci->pdev, "**EDAC Inject: Buffer Allocation error\n");
We have our own edac_*_printk... Feel free to adjust them if they don't
do exactly what you want them to do.
> + return -ENOMEM;
> + }
> +
> + regmap_read(drvdata->mc_vbase, ALTR_SDR_CTLCFG, &read_reg);
> + read_reg &= ~(ALTR_SDR_CTLCFG_GEN_SB_ERR | ALTR_SDR_CTLCFG_GEN_DB_ERR);
> +
> + if (count == 3) {
> + dev_alert(mci->pdev, "** EDAC Inject Double bit error\n");
> + regmap_write(drvdata->mc_vbase, ALTR_SDR_CTLCFG,
> + (read_reg | ALTR_SDR_CTLCFG_GEN_DB_ERR));
> + } else {
> + dev_alert(mci->pdev, "** EDAC Inject Single bit error\n");
> + regmap_write(drvdata->mc_vbase, ALTR_SDR_CTLCFG,
> + (read_reg | ALTR_SDR_CTLCFG_GEN_SB_ERR));
> + }
> +
> + ptemp[0] = 0x5A5A5A5A;
> + ptemp[1] = 0xA5A5A5A5;
> + regmap_write(drvdata->mc_vbase, ALTR_SDR_CTLCFG, read_reg);
> + /* Ensure it has been written out */
> + wmb();
> +
> + reg = ptemp[0];
> + read_reg = ptemp[1];
Those two assignments to local variables seem useless.
> +
> + dma_free_coherent(mci->pdev, 16, ptemp, dma_handle);
> +
> + return count;
> +}
> +
> +static const struct file_operations altr_sdr_mc_debug_inject_fops = {
> + .open = simple_open,
> + .write = altr_sdr_mc_err_inject_write,
> + .llseek = generic_file_llseek,
> +};
> +
> +static void altr_sdr_mc_create_debugfs_nodes(struct mem_ctl_info *mci)
> +{
> + if (mci->debugfs)
> + debugfs_create_file("inject_ctrl", S_IWUSR, mci->debugfs, mci,
> + &altr_sdr_mc_debug_inject_fops);
> +}
> +#else
> +static void altr_sdr_mc_create_debugfs_nodes(struct mem_ctl_info *mci)
> +{}
> +#endif
> +
> +/* Get total memory size in bytes */
> +static u32 altr_sdram_get_total_mem_size(struct regmap *mc_vbase)
> +{
> + u32 size;
> + u32 read_reg, row, bank, col, cs, width;
> + u32 retcode;
> +
> + retcode = regmap_read(mc_vbase, ALTR_SDR_DRAMADDRW, &read_reg);
> + if (retcode < 0)
> + return 0;
It seems like you're using this retcode only once here. Either remove
it like in the second regmap_read() call below or use it consistently
throughout this function.
> +
> + col = (read_reg & ALTR_SDR_DRAMADDRW_COLBIT_MASK) >>
> + ALTR_SDR_DRAMADDRW_COLBIT_LSB;
> + row = (read_reg & ALTR_SDR_DRAMADDRW_ROWBIT_MASK) >>
> + ALTR_SDR_DRAMADDRW_ROWBIT_LSB;
> + bank = (read_reg & ALTR_SDR_DRAMADDRW_BANKBIT_MASK) >>
> + ALTR_SDR_DRAMADDRW_BANKBIT_LSB;
> + cs = (read_reg & ALTR_SDR_DRAMADDRW_CSBIT_MASK) >>
> + ALTR_SDR_DRAMADDRW_CSBIT_LSB;
> +
> + if (regmap_read(mc_vbase, ALTR_SDR_DRAMIFWIDTH, &width) < 0)
> + return 0;
You probably should do those regmap_read()s first, before you do all the
assignments so that you can save yourself the work if one of the reads
fails and you need to return.
> +
> + /* Correct for ECC as its not addressible */
> + if (width == ALTR_SDR_DRAMIFWIDTH_32B_ECC)
> + width = 32;
> + if (width == ALTR_SDR_DRAMIFWIDTH_16B_ECC)
> + width = 16;
> +
> + /* calculate the SDRAM size base on this info */
> + size = 1 << (row + bank + col);
> + size = size * cs * (width / 8);
> + return size;
> +}
> +
> +static int altr_sdram_mc_probe(struct platform_device *pdev)
> +{
> + struct edac_mc_layer layers[2];
> + struct mem_ctl_info *mci;
> + struct altr_sdram_mc_data *drvdata;
> + struct dimm_info *dimm;
> + u32 read_reg, mem_size;
> + int irq;
> + int res = 0, retcode;
> +
> + layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
> + layers[0].size = 1;
> + layers[0].is_virt_csrow = true;
> + layers[1].type = EDAC_MC_LAYER_CHANNEL;
> + layers[1].size = 1;
> + layers[1].is_virt_csrow = false;
> + mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers,
> + sizeof(struct altr_sdram_mc_data));
> + if (!mci)
> + return -ENOMEM;
> +
> + mci->pdev = &pdev->dev;
> + drvdata = mci->pvt_info;
> + platform_set_drvdata(pdev, mci);
> +
> + if (!devres_open_group(&pdev->dev, NULL, GFP_KERNEL)) {
goto free;
and add a label which does edac_mc_free.
> + edac_mc_free(mci);
> + return -ENOMEM;
> + }
> +
> + /* Grab the register values from the sdr-ctl in device tree */
> + drvdata->mc_vbase = syscon_regmap_lookup_by_compatible("altr,sdr-ctl");
> + if (IS_ERR(drvdata->mc_vbase)) {
> + dev_err(&pdev->dev,
> + "regmap for altr,sdr-ctl lookup failed.\n");
edac_*_printk.
> + res = -ENODEV;
> + goto err;
> + }
> +
> + retcode = regmap_read(drvdata->mc_vbase, ALTR_SDR_CTLCFG, &read_reg);
> + if (retcode || ((read_reg & ALTR_SDR_CTLCFG_ECC_AUTO_EN) !=
> + ALTR_SDR_CTLCFG_ECC_AUTO_EN)) {
> + dev_err(&pdev->dev, "No ECC present / ECC disabled - 0x%08X\n",
> + read_reg);
ditto.
> + res = -ENODEV;
> + goto err;
> + }
> +
> + mci->mtype_cap = MEM_FLAG_DDR3;
> + mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
> + mci->edac_cap = EDAC_FLAG_SECDED;
> + mci->mod_name = ALTR_EDAC_MOD_STR;
Calling it just EDAC_MOD_STR is fine.
> + mci->mod_ver = "1";
use a #define.
> + mci->ctl_name = dev_name(&pdev->dev);
> + mci->scrub_mode = SCRUB_SW_SRC;
> + mci->dev_name = dev_name(&pdev->dev);
> +
> + /* Grab memory size from device tree. */
> + mem_size = altr_sdram_get_total_mem_size(drvdata->mc_vbase);
> + dimm = *mci->dimms;
> + if (mem_size <= 0) {
> + dev_err(&pdev->dev, "Unable to calculate memory size\n");
> + res = -ENODEV;
> + goto err;
> + }
> + dimm->nr_pages = ((mem_size - 1) >> PAGE_SHIFT) + 1;
> + dimm->grain = 8;
> + dimm->dtype = DEV_X8;
> + dimm->mtype = MEM_DDR3;
> + dimm->edac_mode = EDAC_SECDED;
> +
> + res = edac_mc_add_mc(mci);
> + if (res < 0)
> + goto err;
> +
> + retcode = regmap_write(drvdata->mc_vbase, ALTR_SDR_DRAMINTR,
> + ALTR_SDR_DRAMINTR_INTRCLR);
> + if (retcode) {
> + dev_err(&pdev->dev, "Error clearing SDRAM ECC IRQ\n");
> + res = -ENODEV;
> + goto err;
> + }
> +
> + irq = platform_get_irq(pdev, 0);
> + res = devm_request_irq(&pdev->dev, irq, altr_sdram_mc_err_handler,
> + 0, dev_name(&pdev->dev), mci);
> + if (res < 0) {
> + dev_err(&pdev->dev, "Unable to request irq %d\n", irq);
> + res = -ENODEV;
> + goto err;
> + }
> +
> + retcode = regmap_write(drvdata->mc_vbase, ALTR_SDR_DRAMINTR,
> + (ALTR_SDR_DRAMINTR_INTRCLR | ALTR_SDR_DRAMINTR_INTREN));
> + if (retcode) {
> + dev_err(&pdev->dev, "Error enabling SDRAM ECC IRQ\n");
> + res = -ENODEV;
> + goto err2;
> + }
Btw, you might want to restructure this function to do all your regmap
stuff, total memsize and other platform queries and once those succeed,
only then do edac_mc_alloc, edac_mc_add_mc, etc. This should save you a
lot of unwinding work in the error path.
--
Regards/Gruss,
Boris.
Sent from a fat crate under my desk. Formatting is fine.
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