Re: [PATCH v5 2/2] EDAC: add EDAC driver for DMC520
From: Borislav Petkov
Date: Wed Aug 07 2019 - 10:39:35 EST
On Thu, Jul 25, 2019 at 12:49:27AM +0000, Lei Wang wrote:
> New driver supports error detection and correction on the devices with ARM
> DMC-520 memory controller.
>
> Signed-off-by: Lei Wang <leiwang_git@xxxxxxxxxxx>
> Reviewed-by: James Morse <james.morse@xxxxxxx>
> ---
> Changes in v5:
> - When enable configured interrupts, do not potentially disable
> other irrelevant interrupts.
> - fix return type of dmc520_get_scrub_type to enum scrub_type
> - Use capital letters for enum
> - Retrieve memory width from dmc register format_control
> - use cheaper spin_lock API.
> - Remove compatible line for "brcm,dmc-520"
> - Add James' Reviewed-by
> ---
> MAINTAINERS | 6 +
> drivers/edac/Kconfig | 7 +
> drivers/edac/Makefile | 1 +
> drivers/edac/dmc520_edac.c | 632 +++++++++++++++++++++++++++++++++++++
> 4 files changed, 646 insertions(+)
> create mode 100644 drivers/edac/dmc520_edac.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 77eae44bf5de..7c1ac8bc8ea1 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -5703,6 +5703,12 @@ F: Documentation/driver-api/edac.rst
> F: drivers/edac/
> F: include/linux/edac.h
>
> +EDAC-DMC520
> +M: Lei Wang <lewan@xxxxxxxxxxxxx>
> +L: linux-edac@xxxxxxxxxxxxxxx
> +S: Supported
> +F: drivers/edac/dmc520_edac.c
> +
> EDAC-E752X
> M: Mark Gross <mark.gross@xxxxxxxxx>
> L: linux-edac@xxxxxxxxxxxxxxx
> diff --git a/drivers/edac/Kconfig b/drivers/edac/Kconfig
> index 200c04ce5b0e..7fde5aea0c1a 100644
> --- a/drivers/edac/Kconfig
> +++ b/drivers/edac/Kconfig
> @@ -510,4 +510,11 @@ config EDAC_ASPEED
> First, ECC must be configured in the bootloader. Then, this driver
> will expose error counters via the EDAC kernel framework.
>
> +config EDAC_DMC520
> + tristate "ARM DMC-520 ECC"
> + depends on ARM64
> + help
> + Support for error detection and correction on the
> + SoCs with ARM DMC-520 DRAM controller.
> +
> endif # EDAC
> diff --git a/drivers/edac/Makefile b/drivers/edac/Makefile
> index 165ca65e1a3a..e0d98f5b2045 100644
> --- a/drivers/edac/Makefile
> +++ b/drivers/edac/Makefile
> @@ -85,3 +85,4 @@ obj-$(CONFIG_EDAC_XGENE) += xgene_edac.o
> obj-$(CONFIG_EDAC_TI) += ti_edac.o
> obj-$(CONFIG_EDAC_QCOM) += qcom_edac.o
> obj-$(CONFIG_EDAC_ASPEED) += aspeed_edac.o
> +obj-$(CONFIG_EDAC_DMC520) += dmc520_edac.o
> diff --git a/drivers/edac/dmc520_edac.c b/drivers/edac/dmc520_edac.c
> new file mode 100644
> index 000000000000..aeb8d84405cf
> --- /dev/null
> +++ b/drivers/edac/dmc520_edac.c
> @@ -0,0 +1,632 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/* EDAC driver for DMC-520 */
That comment is kinda useless.
> +#include <linux/bitfield.h>
> +#include <linux/edac.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/spinlock.h>
> +#include "edac_mc.h"
> +
> +/* DMC-520 registers */
> +#define REG_OFFSET_FEATURE_CONFIG 0x130
> +#define REG_OFFSET_ECC_ERRC_COUNT_31_00 0x158
> +#define REG_OFFSET_ECC_ERRC_COUNT_63_32 0x15C
> +#define REG_OFFSET_ECC_ERRD_COUNT_31_00 0x160
> +#define REG_OFFSET_ECC_ERRD_COUNT_63_32 0x164
> +#define REG_OFFSET_INTERRUPT_CONTROL 0x500
> +#define REG_OFFSET_INTERRUPT_CLR 0x508
> +#define REG_OFFSET_INTERRUPT_STATUS 0x510
> +#define REG_OFFSET_DRAM_ECC_ERRC_INT_INFO_31_00 0x528
> +#define REG_OFFSET_DRAM_ECC_ERRC_INT_INFO_63_32 0x52C
> +#define REG_OFFSET_DRAM_ECC_ERRD_INT_INFO_31_00 0x530
> +#define REG_OFFSET_DRAM_ECC_ERRD_INT_INFO_63_32 0x534
> +#define REG_OFFSET_ADDRESS_CONTROL_NOW 0x1010
> +#define REG_OFFSET_MEMORY_TYPE_NOW 0x1128
> +#define REG_OFFSET_SCRUB_CONTROL0_NOW 0x1170
> +#define REG_OFFSET_FORMAT_CONTROL 0x18
> +
> +/* DMC-520 types, masks and bitfields */
> +#define DRAM_ECC_INT_CE_BIT BIT(2)
> +#define DRAM_ECC_INT_UE_BIT BIT(3)
> +#define ALL_INT_MASK GENMASK(9, 0)
> +#define MEMORY_WIDTH_MASK GENMASK(1, 0)
> +#define SCRUB_TRIGGER0_NEXT_MASK GENMASK(1, 0)
> +#define REG_FIELD_DRAM_ECC_ENABLED GENMASK(1, 0)
> +#define REG_FIELD_MEMORY_TYPE GENMASK(2, 0)
> +#define REG_FIELD_DEVICE_WIDTH GENMASK(9, 8)
> +#define REG_FIELD_ADDRESS_CONTROL_COL GENMASK(2, 0)
> +#define REG_FIELD_ADDRESS_CONTROL_ROW GENMASK(10, 8)
> +#define REG_FIELD_ADDRESS_CONTROL_BANK GENMASK(18, 16)
> +#define REG_FIELD_ADDRESS_CONTROL_RANK GENMASK(25, 24)
> +#define REG_FIELD_ERR_INFO_LOW_VALID BIT(0)
> +#define REG_FIELD_ERR_INFO_LOW_COL GENMASK(10, 1)
> +#define REG_FIELD_ERR_INFO_LOW_ROW GENMASK(28, 11)
> +#define REG_FIELD_ERR_INFO_LOW_RANK GENMASK(31, 29)
> +#define REG_FIELD_ERR_INFO_HIGH_BANK GENMASK(3, 0)
> +#define REG_FIELD_ERR_INFO_HIGH_VALID BIT(31)
> +
> +#define DRAM_ADDRESS_CONTROL_MIN_COL_BITS 8
> +#define DRAM_ADDRESS_CONTROL_MIN_ROW_BITS 11
> +
> +#define DMC520_SCRUB_TRIGGER_ERR_DETECT 2
> +#define DMC520_SCRUB_TRIGGER_IDLE 3
One tab too many. Keep them all vertically aligned.
> +
> +/* Driver settings */
> +/* The max-length message would be: "rank:7 bank:15 row:262143 col:1023".
> + * Max length is 34. Using a 40-size buffer is enough.
> + */
> +#define EDAC_MSG_BUF_SIZE 40
That define is driver-local only. Prefix it with "DMC520_" or so, not
with "EDAC_".
> +#define EDAC_MOD_NAME "dmc520-edac"
> +#define EDAC_CTL_NAME "dmc520"
> +
> +/* the data bus width for the attached memory chips. */
> +enum dmc520_mem_width {
> + MEM_WIDTH_X32 = 2,
> + MEM_WIDTH_X64 = 3
> +};
> +
> +/* memory type */
> +enum dmc520_mem_type {
> + MEM_TYPE_DDR3 = 1,
> + MEM_TYPE_DDR4 = 2
> +};
> +
> +/* memory device width */
> +enum dmc520_dev_width {
> + DEV_WIDTH_X4 = 0,
> + DEV_WIDTH_X8 = 1,
> + DEV_WIDTH_X16 = 2
> +};
> +
> +struct ecc_error_info {
> + u32 col;
> + u32 row;
> + u32 bank;
> + u32 rank;
> +};
> +
> +/* The EDAC driver private data */
> +struct dmc520_edac {
> + void __iomem *reg_base;
> + u32 nintr;
> + u32 interrupt_mask_all;
> + spinlock_t ecc_lock;
> + u32 interrupt_masks[0];
> +};
> +
> +static int dmc520_mc_idx;
> +
> +static irqreturn_t
> +dmc520_edac_dram_all_isr(int irq, struct mem_ctl_info *mci, u32 interrupt_mask);
> +
> +#define DECLARE_ISR(index) \
> +static irqreturn_t dmc520_isr_##index (int irq, void *data) \
Please integrate scripts/checkpatch.pl into your patch creation
workflow. Some of the warnings/errors *actually* make sense.
WARNING: space prohibited between function name and open parenthesis '('
#200: FILE: drivers/edac/dmc520_edac.c:108:
+static irqreturn_t dmc520_isr_##index (int irq, void *data) \
> +{ \
> + struct mem_ctl_info *mci; \
> + struct dmc520_edac *edac; \
> + mci = data; \
> + edac = mci->pvt_info; \
> + return dmc520_edac_dram_all_isr(irq, mci, edac->interrupt_masks[index]); \
> +}
> +
> +DECLARE_ISR(0)
> +DECLARE_ISR(1)
> +/* More DECLARE_ISR(index) can be added to support more interrupt lines. */
> +
> +irq_handler_t dmc520_isr_array[] = {
> + dmc520_isr_0,
> + dmc520_isr_1
> + /* More dmc520_isr_index can be added to support more interrupt lines. */
What are those comments really for?
> +};
> +
> +static u32 dmc520_read_reg(struct dmc520_edac *edac, u32 offset)
> +{
> + return readl(edac->reg_base + offset);
> +}
> +
> +static void dmc520_write_reg(struct dmc520_edac *edac, u32 val, u32 offset)
> +{
> + writel(val, edac->reg_base + offset);
> +}
> +
> +static u32 dmc520_calc_dram_ecc_error(u32 value)
> +{
> + u32 total = 0;
> +
> + /* Each rank's error counter takes one byte */
> + while (value > 0) {
> + total += (value & 0xFF);
> + value >>= 8;
> + }
> + return total;
> +}
> +
> +static u32 dmc520_get_dram_ecc_error_count(struct dmc520_edac *edac,
> + bool is_ce)
> +{
> + u32 reg_offset_low, reg_offset_high;
> + u32 err_low, err_high;
> + u32 err_count;
> +
> + reg_offset_low = is_ce ? REG_OFFSET_ECC_ERRC_COUNT_31_00 :
> + REG_OFFSET_ECC_ERRD_COUNT_31_00;
> + reg_offset_high = is_ce ? REG_OFFSET_ECC_ERRC_COUNT_63_32 :
> + REG_OFFSET_ECC_ERRD_COUNT_63_32;
> +
> + err_low = dmc520_read_reg(edac, reg_offset_low);
> + err_high = dmc520_read_reg(edac, reg_offset_high);
> + /* Reset error counters */
> + dmc520_write_reg(edac, 0, reg_offset_low);
> + dmc520_write_reg(edac, 0, reg_offset_high);
> +
> + err_count = dmc520_calc_dram_ecc_error(err_low) +
> + dmc520_calc_dram_ecc_error(err_high);
> +
> + return err_count;
> +}
> +
> +static void dmc520_get_dram_ecc_error_info(struct dmc520_edac *edac,
> + bool is_ce,
> + struct ecc_error_info *info)
> +{
> + u32 reg_offset_low, reg_offset_high;
> + u32 reg_val_low, reg_val_high;
> + bool valid;
> +
> + reg_offset_low = is_ce ? REG_OFFSET_DRAM_ECC_ERRC_INT_INFO_31_00 :
> + REG_OFFSET_DRAM_ECC_ERRD_INT_INFO_31_00;
> + reg_offset_high = is_ce ? REG_OFFSET_DRAM_ECC_ERRC_INT_INFO_63_32 :
> + REG_OFFSET_DRAM_ECC_ERRD_INT_INFO_63_32;
> +
> + reg_val_low = dmc520_read_reg(edac, reg_offset_low);
> + reg_val_high = dmc520_read_reg(edac, reg_offset_high);
> +
> + valid = (FIELD_GET(REG_FIELD_ERR_INFO_LOW_VALID, reg_val_low) != 0) &&
> + (FIELD_GET(REG_FIELD_ERR_INFO_HIGH_VALID, reg_val_high) != 0);
> +
> + if (valid) {
> + info->col = FIELD_GET(REG_FIELD_ERR_INFO_LOW_COL, reg_val_low);
> + info->row = FIELD_GET(REG_FIELD_ERR_INFO_LOW_ROW, reg_val_low);
> + info->rank = FIELD_GET(REG_FIELD_ERR_INFO_LOW_RANK, reg_val_low);
> + info->bank = FIELD_GET(REG_FIELD_ERR_INFO_HIGH_BANK, reg_val_high);
> + } else {
> + memset(info, 0, sizeof(struct ecc_error_info));
> + }
> +}
> +
> +static bool dmc520_is_ecc_enabled(void __iomem *reg_base)
> +{
> + u32 reg_val = readl(reg_base + REG_OFFSET_FEATURE_CONFIG);
> +
> + return (FIELD_GET(REG_FIELD_DRAM_ECC_ENABLED, reg_val) != 0);
No need for that " != 0" at the end.
> +}
> +
> +static enum scrub_type dmc520_get_scrub_type(struct dmc520_edac *edac)
> +{
> + enum scrub_type type = SCRUB_NONE;
> + u32 reg_val, scrub_cfg;
> +
> + reg_val = dmc520_read_reg(edac, REG_OFFSET_SCRUB_CONTROL0_NOW);
> + scrub_cfg = FIELD_GET(SCRUB_TRIGGER0_NEXT_MASK, reg_val);
> +
> + if (DMC520_SCRUB_TRIGGER_ERR_DETECT == scrub_cfg ||
> + DMC520_SCRUB_TRIGGER_IDLE == scrub_cfg)
> + type = SCRUB_HW_PROG;
More from checkpatch:
WARNING: Comparisons should place the constant on the right side of the test
#309: FILE: drivers/edac/dmc520_edac.c:217:
+ if (DMC520_SCRUB_TRIGGER_ERR_DETECT == scrub_cfg ||
WARNING: Comparisons should place the constant on the right side of the test
#310: FILE: drivers/edac/dmc520_edac.c:218:
+ DMC520_SCRUB_TRIGGER_IDLE == scrub_cfg)
> +
> + return type;
> +}
> +
> +/* Get the memory data bus width, in number of bytes. */
> +static u32 dmc520_get_memory_width(struct dmc520_edac *edac)
> +{
> + static u32 mem_width;
> + u32 reg_val;
> + enum dmc520_mem_width mem_width_field;
Please sort function local variables declaration in a reverse christmas
tree order:
<type A> longest_variable_name;
<type B> shorter_var_name;
<type C> even_shorter;
<type D> i;
Here and in the other functions.
> +
> + if (mem_width == 0) {
Flip that check and save yourself an indentation level:
if (mem_width)
return;
reg_val = ...
> + reg_val = dmc520_read_reg(edac, REG_OFFSET_FORMAT_CONTROL);
> + mem_width_field = FIELD_GET(MEMORY_WIDTH_MASK, reg_val);
> +
> + if (mem_width_field == MEM_WIDTH_X32)
> + mem_width = 4; /* 32-bits, 4 bytes */
> + else if (mem_width_field == MEM_WIDTH_X64)
> + mem_width = 8; /* 64-bits, 8 bytes */
Please no side-comments. And those you can directly remove as they're
useless - your defines and variables should be named properly so that
there is no need for a comment here additionally.
> + }
> +
> + return mem_width;
> +}
> +
> +static enum mem_type dmc520_get_mtype(struct dmc520_edac *edac)
> +{
> + enum mem_type mt = MEM_UNKNOWN;
> + u32 reg_val;
> + enum dmc520_mem_type type;
> +
> + reg_val = dmc520_read_reg(edac, REG_OFFSET_MEMORY_TYPE_NOW);
> + type = FIELD_GET(REG_FIELD_MEMORY_TYPE, reg_val);
> +
> + switch (type) {
> + case MEM_TYPE_DDR3:
> + mt = MEM_DDR3;
> + break;
> +
> + case MEM_TYPE_DDR4:
> + mt = MEM_DDR4;
> + break;
> + }
> +
> + return mt;
> +}
> +
> +static enum dev_type dmc520_get_dtype(struct dmc520_edac *edac)
> +{
> + enum dev_type dt = DEV_UNKNOWN;
> + u32 reg_val;
> + enum dmc520_dev_width device_width;
> +
> + reg_val = dmc520_read_reg(edac, REG_OFFSET_MEMORY_TYPE_NOW);
> + device_width = FIELD_GET(REG_FIELD_DEVICE_WIDTH, reg_val);
> +
> + switch (device_width) {
> + case DEV_WIDTH_X4:
> + dt = DEV_X4;
> + break;
> +
> + case DEV_WIDTH_X8:
> + dt = DEV_X8;
> + break;
> +
> + case DEV_WIDTH_X16:
> + dt = DEV_X16;
> + break;
> + }
> +
> + return dt;
> +}
> +
> +static u32 dmc520_get_rank_count(void __iomem *reg_base)
> +{
> + u32 reg_val, rank_bits;
> +
> + reg_val = readl(reg_base + REG_OFFSET_ADDRESS_CONTROL_NOW);
> + rank_bits = FIELD_GET(REG_FIELD_ADDRESS_CONTROL_RANK, reg_val);
> +
> + return (1 << rank_bits);
return BIT(rank_bits);
> +}
> +
> +static u64 dmc520_get_rank_size(struct dmc520_edac *edac)
> +{
> + u32 reg_val, col_bits, row_bits, bank_bits;
> +
> + reg_val = dmc520_read_reg(edac, REG_OFFSET_ADDRESS_CONTROL_NOW);
> +
> + col_bits = FIELD_GET(REG_FIELD_ADDRESS_CONTROL_COL, reg_val) +
> + DRAM_ADDRESS_CONTROL_MIN_COL_BITS;
> + row_bits = FIELD_GET(REG_FIELD_ADDRESS_CONTROL_ROW, reg_val) +
> + DRAM_ADDRESS_CONTROL_MIN_ROW_BITS;
> + bank_bits = FIELD_GET(REG_FIELD_ADDRESS_CONTROL_BANK, reg_val);
> +
> + return (u64)dmc520_get_memory_width(edac) << (col_bits + row_bits + bank_bits);
> +}
> +
> +static void dmc520_handle_dram_ecc_errors(struct mem_ctl_info *mci,
> + bool is_ce)
> +{
> + struct ecc_error_info info;
> + struct dmc520_edac *edac;
> + u32 cnt;
> + char message[EDAC_MSG_BUF_SIZE];
> +
> + edac = mci->pvt_info;
> + dmc520_get_dram_ecc_error_info(edac, is_ce, &info);
> +
> + cnt = dmc520_get_dram_ecc_error_count(edac, is_ce);
> +
> + if (cnt > 0) {
Save an indentation level:
if (!cnt)
return;
snprintf...
> + snprintf(message, ARRAY_SIZE(message),
> + "rank:%d bank:%d row:%d col:%d",
> + info.rank, info.bank,
> + info.row, info.col);
> +
> + spin_lock(&edac->ecc_lock);
> + edac_mc_handle_error((is_ce ? HW_EVENT_ERR_CORRECTED :
> + HW_EVENT_ERR_UNCORRECTED),
> + mci, cnt, 0, 0, 0, info.rank, -1, -1,
> + message, "");
> + spin_unlock(&edac->ecc_lock);
> + }
> +}
> +
> +static irqreturn_t dmc520_edac_dram_ecc_isr(int irq, struct mem_ctl_info *mci, bool is_ce)
> +{
> + u32 i_mask;
> + struct dmc520_edac *edac;
> +
> + edac = mci->pvt_info;
> +
> + i_mask = is_ce ? DRAM_ECC_INT_CE_BIT : DRAM_ECC_INT_UE_BIT;
> +
> + dmc520_handle_dram_ecc_errors(mci, is_ce);
> +
> + dmc520_write_reg(edac, i_mask, REG_OFFSET_INTERRUPT_CLR);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static irqreturn_t
> +dmc520_edac_dram_all_isr(int irq, struct mem_ctl_info *mci, u32 interrupt_mask)
> +{
> + struct dmc520_edac *edac;
> + u32 status;
> + irqreturn_t irq_ret = IRQ_NONE;
> +
> + edac = mci->pvt_info;
> +
> + status = dmc520_read_reg(edac, REG_OFFSET_INTERRUPT_STATUS);
> +
> + if ((interrupt_mask & DRAM_ECC_INT_CE_BIT) &&
> + (status & DRAM_ECC_INT_CE_BIT))
> + irq_ret = dmc520_edac_dram_ecc_isr(irq, mci, true);
> +
> + if ((interrupt_mask & DRAM_ECC_INT_UE_BIT) &&
> + (status & DRAM_ECC_INT_UE_BIT))
> + irq_ret = dmc520_edac_dram_ecc_isr(irq, mci, false);
> +
> + /* If in the future there are more supported interrupts in a different
> + * platform, more condition statements can be added here for each
> + * interrupt flag, together with its corresponding isr implementations.
> + */
This comment above is useless.
Also, kernel comments style is:
/*
* A sentence ending with a full-stop.
* Another sentence. ...
* More sentences. ...
*/
> +
> + return irq_ret;
> +}
> +
> +static void dmc520_init_csrow(struct mem_ctl_info *mci)
> +{
> + struct csrow_info *csi;
> + struct dimm_info *dimm;
> + int row, ch;
> + enum dev_type dt;
> + enum mem_type mt;
> + u64 rs;
> + u32 pages_per_rank;
> + struct dmc520_edac *edac = mci->pvt_info;
> +
> + dt = dmc520_get_dtype(edac);
> + mt = dmc520_get_mtype(edac);
> + rs = dmc520_get_rank_size(edac);
> + pages_per_rank = rs >> PAGE_SHIFT;
> +
> + for (row = 0; row < mci->nr_csrows; row++) {
> + csi = mci->csrows[row];
> +
> + for (ch = 0; ch < csi->nr_channels; ch++) {
> + dimm = csi->channels[ch]->dimm;
> + dimm->grain = dmc520_get_memory_width(edac);
> + dimm->dtype = dt;
> + dimm->mtype = mt;
> + dimm->edac_mode = EDAC_FLAG_SECDED;
> + dimm->nr_pages = pages_per_rank / csi->nr_channels;
> + }
> + }
> +}
> +
> +static int dmc520_edac_probe(struct platform_device *pdev)
> +{
> + struct device *dev;
> + struct dmc520_edac *edac;
> + struct mem_ctl_info *mci;
> + struct edac_mc_layer layers[1];
> + int ret, intr_index, nintr, nintr_registered = 0;
> + struct resource *res;
> + void __iomem *reg_base;
> + u32 reg_val;
> +
> + /* Parsing the device node */
> + dev = &pdev->dev;
> +
> + nintr = of_property_count_u32_elems(dev->of_node, "interrupt-config");
> + if (nintr <= 0) {
> + edac_printk(KERN_ERR, EDAC_MOD_NAME,
> + "Invalid device node configuration: at least one interrupt "
> + "line & config is expected.\n");
More from checkpatch:
WARNING: quoted string split across lines
#528: FILE: drivers/edac/dmc520_edac.c:436:
+ "Invalid device node configuration: at least one interrupt "
+ "line & config is expected.\n");
WARNING: quoted string split across lines
#535: FILE: drivers/edac/dmc520_edac.c:443:
+ "Invalid device node configuration: # of interrupt config "
+ "elements (%d) can not exceed %ld.\n",
WARNING: quoted string split across lines
#579: FILE: drivers/edac/dmc520_edac.c:487:
+ "interrupt-config error: "
+ "element %d's interrupt mask %d has overlap.\n",
WARNING: quoted string split across lines
#590: FILE: drivers/edac/dmc520_edac.c:498:
+ "interrupt-config warning: "
+ "interrupt mask (0x%x) is not supported by dmc520 (0x%lx).\n",
> + return -EINVAL;
> + }
> +
> + if (nintr > ARRAY_SIZE(dmc520_isr_array)) {
> + edac_printk(KERN_ERR, EDAC_MOD_NAME,
> + "Invalid device node configuration: # of interrupt config "
> + "elements (%d) can not exceed %ld.\n",
> + nintr, ARRAY_SIZE(dmc520_isr_array));
> + return -EINVAL;
> + }
> +
> + /* Initialize dmc520 edac */
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + reg_base = devm_ioremap_resource(dev, res);
> + if (IS_ERR(reg_base))
> + return PTR_ERR(reg_base);
> +
> + if (!dmc520_is_ecc_enabled(reg_base))
> + return -ENXIO;
> +
> + layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
> + layers[0].size = dmc520_get_rank_count(reg_base);
> + layers[0].is_virt_csrow = true;
> +
> + mci = edac_mc_alloc(dmc520_mc_idx++, ARRAY_SIZE(layers), layers,
> + sizeof(struct dmc520_edac) + sizeof(u32) * nintr);
> + if (!mci) {
> + edac_printk(KERN_ERR, EDAC_MOD_NAME,
> + "Failed to allocate memory for mc instance\n");
> + return -ENOMEM;
> + }
> +
> + edac = mci->pvt_info;
> + edac->reg_base = reg_base;
> + edac->nintr = nintr;
> + edac->interrupt_mask_all = 0;
> + spin_lock_init(&edac->ecc_lock);
Move that checking...
> +
> + ret = of_property_read_u32_array(dev->of_node, "interrupt-config",
> + edac->interrupt_masks, nintr);
> + if (ret) {
> + edac_printk(KERN_ERR, EDAC_MOD_NAME,
> + "Failed to get interrupt-config arrays.\n");
> + goto err_free_mc;
> + }
> +
> + for (intr_index = 0; intr_index < nintr; ++intr_index) {
> + if (edac->interrupt_mask_all & edac->interrupt_masks[intr_index]) {
> + edac_printk(KERN_ERR, EDAC_MC,
> + "interrupt-config error: "
> + "element %d's interrupt mask %d has overlap.\n",
> + intr_index, edac->interrupt_masks[intr_index]);
> + goto err_free_mc;
> + }
> +
> + edac->interrupt_mask_all |= edac->interrupt_masks[intr_index];
> + }
> +
> + if ((edac->interrupt_mask_all | ALL_INT_MASK) != ALL_INT_MASK) {
> + edac_printk(KERN_WARNING, EDAC_MOD_NAME,
> + "interrupt-config warning: "
> + "interrupt mask (0x%x) is not supported by dmc520 (0x%lx).\n",
> + edac->interrupt_mask_all, ALL_INT_MASK);
> + }
> + edac->interrupt_mask_all &= ALL_INT_MASK;
> +
> + platform_set_drvdata(pdev, mci);
... up-to-here before the edac_mc_alloc() call so that you don't have to
needlessly goto err_free_mc and free the memory you just allocated if
any of those properties reading fails. IOW, do all your hw init first
and then call edac_mc_alloc(), when you have everything needed.
> +
> + mci->pdev = dev;
> + mci->mtype_cap = MEM_FLAG_DDR3 | MEM_FLAG_DDR4;
> + mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
> + mci->edac_cap = EDAC_FLAG_SECDED;
> + mci->scrub_cap = SCRUB_FLAG_HW_SRC;
> + mci->scrub_mode = dmc520_get_scrub_type(edac);
> + mci->ctl_name = EDAC_CTL_NAME;
> + mci->dev_name = dev_name(mci->pdev);
> + mci->mod_name = EDAC_MOD_NAME;
> + mci->ctl_page_to_phys = NULL;
> +
> + edac_op_state = EDAC_OPSTATE_INT;
> +
> + dmc520_init_csrow(mci);
> +
> + ret = edac_mc_add_mc(mci);
> + if (ret) {
> + edac_printk(KERN_ERR, EDAC_MOD_NAME,
> + "Failed to register with EDAC core\n");
> + goto err_free_mc;
> + }
> +
> + /* Clear interrupts, not affecting other unrelated interrupts */
> + reg_val = dmc520_read_reg(edac, REG_OFFSET_INTERRUPT_CONTROL);
> + dmc520_write_reg(edac, reg_val & (~(edac->interrupt_mask_all)),
> + REG_OFFSET_INTERRUPT_CONTROL);
> + dmc520_write_reg(edac, edac->interrupt_mask_all,
> + REG_OFFSET_INTERRUPT_CLR);
> +
> + for (intr_index = 0; intr_index < nintr; ++intr_index) {
> + int irq_id = platform_get_irq(pdev, intr_index);
> +
> + if (irq_id < 0) {
> + edac_printk(KERN_ERR, EDAC_MC,
> + "Failed to get irq #%d\n", intr_index);
> + ret = -ENODEV;
> + goto err_free_irq;
> + }
> +
> + ret = devm_request_irq(&pdev->dev, irq_id,
> + dmc520_isr_array[intr_index], IRQF_SHARED,
> + dev_name(&pdev->dev), mci);
> + if (ret < 0) {
> + edac_printk(KERN_ERR, EDAC_MC,
> + "Failed to request irq %d\n", irq_id);
> + goto err_free_irq;
> + }
> +
> + ++nintr_registered;
> + }
The same with this IRQ requesting and you'll save yourself the err_free_irq too.
> +
> + /* Reset DRAM CE/UE counters */
> + if (edac->interrupt_mask_all & DRAM_ECC_INT_CE_BIT)
> + dmc520_get_dram_ecc_error_count(edac, true);
> +
> + if (edac->interrupt_mask_all & DRAM_ECC_INT_UE_BIT)
> + dmc520_get_dram_ecc_error_count(edac, false);
> +
> + /* Enable interrupts, not affecting other unrelated interrupts */
> + dmc520_write_reg(edac,
> + reg_val | edac->interrupt_mask_all,
> + REG_OFFSET_INTERRUPT_CONTROL);
Align at opening brace:
dmc520_write_reg(edac, reg_val | edac->interrupt_mask_all,
REG_OFFSET_INTERRUPT_CONTROL);
> +
> + return 0;
> +
> +err_free_irq:
> + for (intr_index = 0; intr_index < nintr_registered; ++intr_index) {
> + int irq_id = platform_get_irq(pdev, intr_index);
> +
> + devm_free_irq(&pdev->dev, irq_id, mci);
> + }
> + edac_mc_del_mc(&pdev->dev);
> +err_free_mc:
> + edac_mc_free(mci);
> +
> + return ret;
> +}
> +
> +static int dmc520_edac_remove(struct platform_device *pdev)
> +{
> + struct dmc520_edac *edac;
> + struct mem_ctl_info *mci;
> + u32 reg_val, intr_index;
> +
> + mci = platform_get_drvdata(pdev);
> + edac = mci->pvt_info;
> +
> + /* Disable interrupts */
> + reg_val = dmc520_read_reg(edac, REG_OFFSET_INTERRUPT_CONTROL);
> + dmc520_write_reg(edac, reg_val & (~(edac->interrupt_mask_all)),
> + REG_OFFSET_INTERRUPT_CONTROL);
> +
> + /* free irq's */
> + for (intr_index = 0; intr_index < edac->nintr; ++intr_index) {
> + int irq_id = platform_get_irq(pdev, intr_index);
> +
> + devm_free_irq(&pdev->dev, irq_id, mci);
> + }
> +
> + edac_mc_del_mc(&pdev->dev);
> + edac_mc_free(mci);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id dmc520_edac_driver_id[] = {
> + { .compatible = "arm,dmc-520", },
> + { /* end of table */ }
> +};
> +
> +MODULE_DEVICE_TABLE(of, dmc520_edac_driver_id);
> +
> +static struct platform_driver dmc520_edac_driver = {
> + .driver = {
> + .name = "dmc520",
> + .of_match_table = dmc520_edac_driver_id,
> + },
> +
> + .probe = dmc520_edac_probe,
> + .remove = dmc520_edac_remove
> +};
> +
> +module_platform_driver(dmc520_edac_driver);
> +
> +MODULE_AUTHOR(
No linebreaks like that - let it stick out over 80 cols.
> + "Rui Zhao <ruizhao@xxxxxxxxxxxxx>, Lei Wang <lewan@xxxxxxxxxxxxx>");
> +MODULE_DESCRIPTION("DMC-520 ECC driver");
> +MODULE_LICENSE("GPL v2");
> --
Thx.
--
Regards/Gruss,
Boris.
Good mailing practices for 400: avoid top-posting and trim the reply.