Re: [PATCH v6 2/2] EDAC/qcom: Get rid of hardcoded register offsets

From: Bjorn Andersson
Date: Wed Mar 15 2023 - 18:19:46 EST

On Tue, Mar 14, 2023 at 12:10:32PM +0530, Manivannan Sadhasivam wrote:
> The LLCC EDAC register offsets varies between each SoC. Hardcoding the
> register offsets won't work and will often result in crash due to
> accessing the wrong locations.
>
> Hence, get the register offsets from the LLCC driver matching the
> individual SoCs.
>
> Cc: <stable@xxxxxxxxxxxxxxx> # 6.0: 5365cea199c7 ("soc: qcom: llcc: Rename reg_offset structs to reflect LLCC version")
> Cc: <stable@xxxxxxxxxxxxxxx> # 6.0: c13d7d261e36 ("soc: qcom: llcc: Pass LLCC version based register offsets to EDAC driver")
> Cc: <stable@xxxxxxxxxxxxxxx> # 6.0

Why is there three Cc: stable here, is this a new format for Fixes:?

Regards,
Bjorn

> Fixes: a6e9d7ef252c ("soc: qcom: llcc: Add configuration data for SM8450 SoC")
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
> ---
> drivers/edac/qcom_edac.c | 116 ++++++++++++++---------------
> include/linux/soc/qcom/llcc-qcom.h | 6 --
> 2 files changed, 58 insertions(+), 64 deletions(-)
>
> diff --git a/drivers/edac/qcom_edac.c b/drivers/edac/qcom_edac.c
> index 9cac49596a6f..c0fd0640d362 100644
> --- a/drivers/edac/qcom_edac.c
> +++ b/drivers/edac/qcom_edac.c
> @@ -21,30 +21,9 @@
> #define TRP_SYN_REG_CNT 6
> #define DRP_SYN_REG_CNT 8
>
> -#define LLCC_COMMON_STATUS0 0x0003000c
> #define LLCC_LB_CNT_MASK GENMASK(31, 28)
> #define LLCC_LB_CNT_SHIFT 28
>
> -/* Single & double bit syndrome register offsets */
> -#define TRP_ECC_SB_ERR_SYN0 0x0002304c
> -#define TRP_ECC_DB_ERR_SYN0 0x00020370
> -#define DRP_ECC_SB_ERR_SYN0 0x0004204c
> -#define DRP_ECC_DB_ERR_SYN0 0x00042070
> -
> -/* Error register offsets */
> -#define TRP_ECC_ERROR_STATUS1 0x00020348
> -#define TRP_ECC_ERROR_STATUS0 0x00020344
> -#define DRP_ECC_ERROR_STATUS1 0x00042048
> -#define DRP_ECC_ERROR_STATUS0 0x00042044
> -
> -/* TRP, DRP interrupt register offsets */
> -#define DRP_INTERRUPT_STATUS 0x00041000
> -#define TRP_INTERRUPT_0_STATUS 0x00020480
> -#define DRP_INTERRUPT_CLEAR 0x00041008
> -#define DRP_ECC_ERROR_CNTR_CLEAR 0x00040004
> -#define TRP_INTERRUPT_0_CLEAR 0x00020484
> -#define TRP_ECC_ERROR_CNTR_CLEAR 0x00020440
> -
> /* Mask and shift macros */
> #define ECC_DB_ERR_COUNT_MASK GENMASK(4, 0)
> #define ECC_DB_ERR_WAYS_MASK GENMASK(31, 16)
> @@ -60,15 +39,6 @@
> #define DRP_TRP_INT_CLEAR GENMASK(1, 0)
> #define DRP_TRP_CNT_CLEAR GENMASK(1, 0)
>
> -/* Config registers offsets*/
> -#define DRP_ECC_ERROR_CFG 0x00040000
> -
> -/* Tag RAM, Data RAM interrupt register offsets */
> -#define CMN_INTERRUPT_0_ENABLE 0x0003001c
> -#define CMN_INTERRUPT_2_ENABLE 0x0003003c
> -#define TRP_INTERRUPT_0_ENABLE 0x00020488
> -#define DRP_INTERRUPT_ENABLE 0x0004100c
> -
> #define SB_ERROR_THRESHOLD 0x1
> #define SB_ERROR_THRESHOLD_SHIFT 24
> #define SB_DB_TRP_INTERRUPT_ENABLE 0x3
> @@ -86,9 +56,6 @@ enum {
> static const struct llcc_edac_reg_data edac_reg_data[] = {
> [LLCC_DRAM_CE] = {
> .name = "DRAM Single-bit",
> - .synd_reg = DRP_ECC_SB_ERR_SYN0,
> - .count_status_reg = DRP_ECC_ERROR_STATUS1,
> - .ways_status_reg = DRP_ECC_ERROR_STATUS0,
> .reg_cnt = DRP_SYN_REG_CNT,
> .count_mask = ECC_SB_ERR_COUNT_MASK,
> .ways_mask = ECC_SB_ERR_WAYS_MASK,
> @@ -96,9 +63,6 @@ static const struct llcc_edac_reg_data edac_reg_data[] = {
> },
> [LLCC_DRAM_UE] = {
> .name = "DRAM Double-bit",
> - .synd_reg = DRP_ECC_DB_ERR_SYN0,
> - .count_status_reg = DRP_ECC_ERROR_STATUS1,
> - .ways_status_reg = DRP_ECC_ERROR_STATUS0,
> .reg_cnt = DRP_SYN_REG_CNT,
> .count_mask = ECC_DB_ERR_COUNT_MASK,
> .ways_mask = ECC_DB_ERR_WAYS_MASK,
> @@ -106,9 +70,6 @@ static const struct llcc_edac_reg_data edac_reg_data[] = {
> },
> [LLCC_TRAM_CE] = {
> .name = "TRAM Single-bit",
> - .synd_reg = TRP_ECC_SB_ERR_SYN0,
> - .count_status_reg = TRP_ECC_ERROR_STATUS1,
> - .ways_status_reg = TRP_ECC_ERROR_STATUS0,
> .reg_cnt = TRP_SYN_REG_CNT,
> .count_mask = ECC_SB_ERR_COUNT_MASK,
> .ways_mask = ECC_SB_ERR_WAYS_MASK,
> @@ -116,9 +77,6 @@ static const struct llcc_edac_reg_data edac_reg_data[] = {
> },
> [LLCC_TRAM_UE] = {
> .name = "TRAM Double-bit",
> - .synd_reg = TRP_ECC_DB_ERR_SYN0,
> - .count_status_reg = TRP_ECC_ERROR_STATUS1,
> - .ways_status_reg = TRP_ECC_ERROR_STATUS0,
> .reg_cnt = TRP_SYN_REG_CNT,
> .count_mask = ECC_DB_ERR_COUNT_MASK,
> .ways_mask = ECC_DB_ERR_WAYS_MASK,
> @@ -126,7 +84,7 @@ static const struct llcc_edac_reg_data edac_reg_data[] = {
> },
> };
>
> -static int qcom_llcc_core_setup(struct regmap *llcc_bcast_regmap)
> +static int qcom_llcc_core_setup(struct llcc_drv_data *drv, struct regmap *llcc_bcast_regmap)
> {
> u32 sb_err_threshold;
> int ret;
> @@ -135,31 +93,31 @@ static int qcom_llcc_core_setup(struct regmap *llcc_bcast_regmap)
> * Configure interrupt enable registers such that Tag, Data RAM related
> * interrupts are propagated to interrupt controller for servicing
> */
> - ret = regmap_update_bits(llcc_bcast_regmap, CMN_INTERRUPT_2_ENABLE,
> + ret = regmap_update_bits(llcc_bcast_regmap, drv->edac_reg_offset->cmn_interrupt_2_enable,
> TRP0_INTERRUPT_ENABLE,
> TRP0_INTERRUPT_ENABLE);
> if (ret)
> return ret;
>
> - ret = regmap_update_bits(llcc_bcast_regmap, TRP_INTERRUPT_0_ENABLE,
> + ret = regmap_update_bits(llcc_bcast_regmap, drv->edac_reg_offset->trp_interrupt_0_enable,
> SB_DB_TRP_INTERRUPT_ENABLE,
> SB_DB_TRP_INTERRUPT_ENABLE);
> if (ret)
> return ret;
>
> sb_err_threshold = (SB_ERROR_THRESHOLD << SB_ERROR_THRESHOLD_SHIFT);
> - ret = regmap_write(llcc_bcast_regmap, DRP_ECC_ERROR_CFG,
> + ret = regmap_write(llcc_bcast_regmap, drv->edac_reg_offset->drp_ecc_error_cfg,
> sb_err_threshold);
> if (ret)
> return ret;
>
> - ret = regmap_update_bits(llcc_bcast_regmap, CMN_INTERRUPT_2_ENABLE,
> + ret = regmap_update_bits(llcc_bcast_regmap, drv->edac_reg_offset->cmn_interrupt_2_enable,
> DRP0_INTERRUPT_ENABLE,
> DRP0_INTERRUPT_ENABLE);
> if (ret)
> return ret;
>
> - ret = regmap_write(llcc_bcast_regmap, DRP_INTERRUPT_ENABLE,
> + ret = regmap_write(llcc_bcast_regmap, drv->edac_reg_offset->drp_interrupt_enable,
> SB_DB_DRP_INTERRUPT_ENABLE);
> return ret;
> }
> @@ -173,24 +131,28 @@ qcom_llcc_clear_error_status(int err_type, struct llcc_drv_data *drv)
> switch (err_type) {
> case LLCC_DRAM_CE:
> case LLCC_DRAM_UE:
> - ret = regmap_write(drv->bcast_regmap, DRP_INTERRUPT_CLEAR,
> + ret = regmap_write(drv->bcast_regmap,
> + drv->edac_reg_offset->drp_interrupt_clear,
> DRP_TRP_INT_CLEAR);
> if (ret)
> return ret;
>
> - ret = regmap_write(drv->bcast_regmap, DRP_ECC_ERROR_CNTR_CLEAR,
> + ret = regmap_write(drv->bcast_regmap,
> + drv->edac_reg_offset->drp_ecc_error_cntr_clear,
> DRP_TRP_CNT_CLEAR);
> if (ret)
> return ret;
> break;
> case LLCC_TRAM_CE:
> case LLCC_TRAM_UE:
> - ret = regmap_write(drv->bcast_regmap, TRP_INTERRUPT_0_CLEAR,
> + ret = regmap_write(drv->bcast_regmap,
> + drv->edac_reg_offset->trp_interrupt_0_clear,
> DRP_TRP_INT_CLEAR);
> if (ret)
> return ret;
>
> - ret = regmap_write(drv->bcast_regmap, TRP_ECC_ERROR_CNTR_CLEAR,
> + ret = regmap_write(drv->bcast_regmap,
> + drv->edac_reg_offset->trp_ecc_error_cntr_clear,
> DRP_TRP_CNT_CLEAR);
> if (ret)
> return ret;
> @@ -202,16 +164,54 @@ qcom_llcc_clear_error_status(int err_type, struct llcc_drv_data *drv)
> return ret;
> }
>
> +struct qcom_llcc_syn_regs {
> + u32 synd_reg;
> + u32 count_status_reg;
> + u32 ways_status_reg;
> +};
> +
> +static void get_reg_offsets(struct llcc_drv_data *drv, int err_type,
> + struct qcom_llcc_syn_regs *syn_regs)
> +{
> + const struct llcc_edac_reg_offset *edac_reg_offset = drv->edac_reg_offset;
> +
> + switch (err_type) {
> + case LLCC_DRAM_CE:
> + syn_regs->synd_reg = edac_reg_offset->drp_ecc_sb_err_syn0;
> + syn_regs->count_status_reg = edac_reg_offset->drp_ecc_error_status1;
> + syn_regs->ways_status_reg = edac_reg_offset->drp_ecc_error_status0;
> + break;
> + case LLCC_DRAM_UE:
> + syn_regs->synd_reg = edac_reg_offset->drp_ecc_db_err_syn0;
> + syn_regs->count_status_reg = edac_reg_offset->drp_ecc_error_status1;
> + syn_regs->ways_status_reg = edac_reg_offset->drp_ecc_error_status0;
> + break;
> + case LLCC_TRAM_CE:
> + syn_regs->synd_reg = edac_reg_offset->trp_ecc_sb_err_syn0;
> + syn_regs->count_status_reg = edac_reg_offset->trp_ecc_error_status1;
> + syn_regs->ways_status_reg = edac_reg_offset->trp_ecc_error_status0;
> + break;
> + case LLCC_TRAM_UE:
> + syn_regs->synd_reg = edac_reg_offset->trp_ecc_db_err_syn0;
> + syn_regs->count_status_reg = edac_reg_offset->trp_ecc_error_status1;
> + syn_regs->ways_status_reg = edac_reg_offset->trp_ecc_error_status0;
> + break;
> + }
> +}
> +
> /* Dump Syndrome registers data for Tag RAM, Data RAM bit errors*/
> static int
> dump_syn_reg_values(struct llcc_drv_data *drv, u32 bank, int err_type)
> {
> struct llcc_edac_reg_data reg_data = edac_reg_data[err_type];
> + struct qcom_llcc_syn_regs regs = { };
> int err_cnt, err_ways, ret, i;
> u32 synd_reg, synd_val;
>
> + get_reg_offsets(drv, err_type, &regs);
> +
> for (i = 0; i < reg_data.reg_cnt; i++) {
> - synd_reg = reg_data.synd_reg + (i * 4);
> + synd_reg = regs.synd_reg + (i * 4);
> ret = regmap_read(drv->regmap, drv->offsets[bank] + synd_reg,
> &synd_val);
> if (ret)
> @@ -222,7 +222,7 @@ dump_syn_reg_values(struct llcc_drv_data *drv, u32 bank, int err_type)
> }
>
> ret = regmap_read(drv->regmap,
> - drv->offsets[bank] + reg_data.count_status_reg,
> + drv->offsets[bank] + regs.count_status_reg,
> &err_cnt);
> if (ret)
> goto clear;
> @@ -233,7 +233,7 @@ dump_syn_reg_values(struct llcc_drv_data *drv, u32 bank, int err_type)
> reg_data.name, err_cnt);
>
> ret = regmap_read(drv->regmap,
> - drv->offsets[bank] + reg_data.ways_status_reg,
> + drv->offsets[bank] + regs.ways_status_reg,
> &err_ways);
> if (ret)
> goto clear;
> @@ -296,7 +296,7 @@ llcc_ecc_irq_handler(int irq, void *edev_ctl)
> /* Iterate over the banks and look for Tag RAM or Data RAM errors */
> for (i = 0; i < drv->num_banks; i++) {
> ret = regmap_read(drv->regmap,
> - drv->offsets[i] + DRP_INTERRUPT_STATUS,
> + drv->offsets[i] + drv->edac_reg_offset->drp_interrupt_status,
> &drp_error);
>
> if (!ret && (drp_error & SB_ECC_ERROR)) {
> @@ -312,7 +312,7 @@ llcc_ecc_irq_handler(int irq, void *edev_ctl)
> irq_rc = IRQ_HANDLED;
>
> ret = regmap_read(drv->regmap,
> - drv->offsets[i] + TRP_INTERRUPT_0_STATUS,
> + drv->offsets[i] + drv->edac_reg_offset->trp_interrupt_0_status,
> &trp_error);
>
> if (!ret && (trp_error & SB_ECC_ERROR)) {
> @@ -339,7 +339,7 @@ static int qcom_llcc_edac_probe(struct platform_device *pdev)
> int ecc_irq;
> int rc;
>
> - rc = qcom_llcc_core_setup(llcc_driv_data->bcast_regmap);
> + rc = qcom_llcc_core_setup(llcc_driv_data, llcc_driv_data->bcast_regmap);
> if (rc)
> return rc;
>
> diff --git a/include/linux/soc/qcom/llcc-qcom.h b/include/linux/soc/qcom/llcc-qcom.h
> index ad1fd718169d..3a2ea97e3d36 100644
> --- a/include/linux/soc/qcom/llcc-qcom.h
> +++ b/include/linux/soc/qcom/llcc-qcom.h
> @@ -69,9 +69,6 @@ struct llcc_slice_desc {
> /**
> * struct llcc_edac_reg_data - llcc edac registers data for each error type
> * @name: Name of the error
> - * @synd_reg: Syndrome register address
> - * @count_status_reg: Status register address to read the error count
> - * @ways_status_reg: Status register address to read the error ways
> * @reg_cnt: Number of registers
> * @count_mask: Mask value to get the error count
> * @ways_mask: Mask value to get the error ways
> @@ -80,9 +77,6 @@ struct llcc_slice_desc {
> */
> struct llcc_edac_reg_data {
> char *name;
> - u64 synd_reg;
> - u64 count_status_reg;
> - u64 ways_status_reg;
> u32 reg_cnt;
> u32 count_mask;
> u32 ways_mask;
> --
> 2.25.1
>