Re: [PATCH v4 3/4] EDAC/amd64: Extend family ops functions

Yazen Ghannam
2021-10-21T16:28:31Z

On Fri, Oct 15, 2021 at 12:23:59AM +0530, Naveen Krishna Chatradhi wrote:
> From: Muralidhara M K <muralimk@amd.com>
>
> Create new family operation routines and define them respectively.
> This would simplify adding support for future platforms.
>
> Signed-off-by: Muralidhara M K <muralimk@amd.com>
> Signed-off-by: Naveen Krishna Chatradhi <nchatrad@amd.com>
> ---
> Changes since v3:
> 1. Defined new family operation routines
>
> Changs since v2:
> 1. new patch
>
> drivers/edac/amd64_edac.c | 291 ++++++++++++++++++++++----------------
> drivers/edac/amd64_edac.h | 6 +
> 2 files changed, 174 insertions(+), 123 deletions(-)
>
> diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
> index 4fce75013674..131ed19f69dd 100644
> --- a/drivers/edac/amd64_edac.c
> +++ b/drivers/edac/amd64_edac.c
> @@ -1204,10 +1204,7 @@ static void __dump_misc_regs(struct amd64_pvt *pvt)
> /* Display and decode various NB registers for debug purposes. */
> static void dump_misc_regs(struct amd64_pvt *pvt)
> {
> - if (pvt->umc)
> - __dump_misc_regs_df(pvt);
> - else
> - __dump_misc_regs(pvt);
> + pvt->ops->display_misc_regs(pvt);
>
> edac_dbg(1, " DramHoleValid: %s\n", dhar_valid(pvt) ? "yes" : "no");
>
> @@ -1217,25 +1214,31 @@ static void dump_misc_regs(struct amd64_pvt *pvt)
> /*
> * See BKDG, F2x[1,0][5C:40], F2[1,0][6C:60]
> */
> -static void prep_chip_selects(struct amd64_pvt *pvt)
> +static void k8_prep_chip_selects(struct amd64_pvt *pvt)
> {
> - if (pvt->fam == 0xf && pvt->ext_model < K8_REV_F) {
> - pvt->csels[0].b_cnt = pvt->csels[1].b_cnt = 8;
> - pvt->csels[0].m_cnt = pvt->csels[1].m_cnt = 8;
> - } else if (pvt->fam == 0x15 && pvt->model == 0x30) {
> - pvt->csels[0].b_cnt = pvt->csels[1].b_cnt = 4;
> - pvt->csels[0].m_cnt = pvt->csels[1].m_cnt = 2;
> - } else if (pvt->fam >= 0x17) {
> - int umc;
> -
> - for_each_umc(umc) {
> - pvt->csels[umc].b_cnt = 4;
> - pvt->csels[umc].m_cnt = 2;
> - }
> + pvt->csels[0].b_cnt = pvt->csels[1].b_cnt = 8;
> + pvt->csels[0].m_cnt = pvt->csels[1].m_cnt = 8;

This doesn't exactly match the existing code. Base/mask = 8/8 applies to
revisions less than K8_REV_F, and 8/4 for K8_REF_F.

So I think you'll still need the "ext_model" check here in
k8_prep_chip_selects().

> +}
>
> - } else {
> - pvt->csels[0].b_cnt = pvt->csels[1].b_cnt = 8;
> - pvt->csels[0].m_cnt = pvt->csels[1].m_cnt = 4;
> +static void f15m30_prep_chip_selects(struct amd64_pvt *pvt)
> +{
> + pvt->csels[0].b_cnt = pvt->csels[1].b_cnt = 4;
> + pvt->csels[0].m_cnt = pvt->csels[1].m_cnt = 2;
> +}
> +
> +static void fmisc_prep_chip_selects(struct amd64_pvt *pvt)

"fmisc" looks weird. Maybe just call it "default" since it was the
default/else path in the code?

> +{
> + pvt->csels[0].b_cnt = pvt->csels[1].b_cnt = 8;
> + pvt->csels[0].m_cnt = pvt->csels[1].m_cnt = 4;
> +}
> +
> +static void f17_prep_chip_selects(struct amd64_pvt *pvt)
> +{
> + int umc;
> +
> + for_each_umc(umc) {
> + pvt->csels[umc].b_cnt = 4;
> + pvt->csels[umc].m_cnt = 2;
> }
> }
>
> @@ -1297,10 +1300,10 @@ static void read_dct_base_mask(struct amd64_pvt *pvt)
> {
> int cs;
>
> - prep_chip_selects(pvt);
> + pvt->ops->prep_chip_select(pvt);
>
> - if (pvt->umc)
> - return read_umc_base_mask(pvt);
> + if (pvt->ops->get_base_mask)
> + return pvt->ops->get_base_mask(pvt);

The get_base_mask() pointer can be set to this read_dct_base_mask() function
on pre-Family17h systems.

>
> for_each_chip_select(cs, 0, pvt) {
> int reg0 = DCSB0 + (cs * 4);
> @@ -1869,37 +1872,12 @@ static int f16_dbam_to_chip_select(struct amd64_pvt *pvt, u8 dct,
> return ddr3_cs_size(cs_mode, false);
> }
>
> -static int f17_addr_mask_to_cs_size(struct amd64_pvt *pvt, u8 umc,
> - unsigned int cs_mode, int csrow_nr)
> +static int __addr_mask_to_cs_size(u32 addr_mask_orig, unsigned int cs_mode,
> + int csrow_nr, int dimm)
> {
> - u32 addr_mask_orig, addr_mask_deinterleaved;
> u32 msb, weight, num_zero_bits;
> - int dimm, size = 0;
> -
> - /* No Chip Selects are enabled. */
> - if (!cs_mode)
> - return size;
> -
> - /* Requested size of an even CS but none are enabled. */
> - if (!(cs_mode & CS_EVEN) && !(csrow_nr & 1))
> - return size;
> -
> - /* Requested size of an odd CS but none are enabled. */
> - if (!(cs_mode & CS_ODD) && (csrow_nr & 1))
> - return size;
> -
> - /*
> - * There is one mask per DIMM, and two Chip Selects per DIMM.
> - * CS0 and CS1 -> DIMM0
> - * CS2 and CS3 -> DIMM1
> - */
> - dimm = csrow_nr >> 1;
> -
> - /* Asymmetric dual-rank DIMM support. */
> - if ((csrow_nr & 1) && (cs_mode & CS_ODD_SECONDARY))
> - addr_mask_orig = pvt->csels[umc].csmasks_sec[dimm];
> - else
> - addr_mask_orig = pvt->csels[umc].csmasks[dimm];
> + u32 addr_mask_deinterleaved;
> + int size = 0;
>
> /*
> * The number of zero bits in the mask is equal to the number of bits
> @@ -1930,6 +1908,40 @@ static int f17_addr_mask_to_cs_size(struct amd64_pvt *pvt, u8 umc,
> return size >> 10;
> }
>
> +static int f17_addr_mask_to_cs_size(struct amd64_pvt *pvt, u8 umc,
> + unsigned int cs_mode, int csrow_nr)
> +{
> + u32 addr_mask_orig;
> + int dimm, size = 0;
> +
> + /* No Chip Selects are enabled. */
> + if (!cs_mode)
> + return size;
> +
> + /* Requested size of an even CS but none are enabled. */
> + if (!(cs_mode & CS_EVEN) && !(csrow_nr & 1))
> + return size;
> +
> + /* Requested size of an odd CS but none are enabled. */
> + if (!(cs_mode & CS_ODD) && (csrow_nr & 1))
> + return size;
> +
> + /*
> + * There is one mask per DIMM, and two Chip Selects per DIMM.
> + * CS0 and CS1 -> DIMM0
> + * CS2 and CS3 -> DIMM1
> + */
> + dimm = csrow_nr >> 1;
> +
> + /* Asymmetric dual-rank DIMM support. */
> + if ((csrow_nr & 1) && (cs_mode & CS_ODD_SECONDARY))
> + addr_mask_orig = pvt->csels[umc].csmasks_sec[dimm];
> + else
> + addr_mask_orig = pvt->csels[umc].csmasks[dimm];
> +
> + return __addr_mask_to_cs_size(addr_mask_orig, cs_mode, csrow_nr, dimm);

The commit message refers to function ops/pointers, but it didn't say why this
helper function is needed.

> +}
> +
> static void read_dram_ctl_register(struct amd64_pvt *pvt)
> {
>
> @@ -2512,143 +2524,168 @@ static void debug_display_dimm_sizes(struct amd64_pvt *pvt, u8 ctrl)
> }
> }
>
> +/* Prototypes for family specific ops routines */
> +static int init_csrows(struct mem_ctl_info *mci);
> +static int init_csrows_df(struct mem_ctl_info *mci);
> +static void __read_mc_regs_df(struct amd64_pvt *pvt);
> +static void find_umc_channel(struct mce *m, struct err_info *err);
> +
> +static const struct low_ops k8_ops = {
> + .early_channel_count = k8_early_channel_count,
> + .map_sysaddr_to_csrow = k8_map_sysaddr_to_csrow,
> + .dbam_to_cs = k8_dbam_to_chip_select,
> + .prep_chip_select = k8_prep_chip_selects,
> + .display_misc_regs = __dump_misc_regs,
> + .populate_csrows = init_csrows,
> +};
> +
> +static const struct low_ops f10_ops = {
> + .early_channel_count = f1x_early_channel_count,
> + .map_sysaddr_to_csrow = f1x_map_sysaddr_to_csrow,
> + .dbam_to_cs = f10_dbam_to_chip_select,
> + .prep_chip_select = fmisc_prep_chip_selects,
> + .display_misc_regs = __dump_misc_regs,
> + .populate_csrows = init_csrows,
> +};
> +
> +static const struct low_ops f15_ops = {
> + .early_channel_count = f1x_early_channel_count,
> + .map_sysaddr_to_csrow = f1x_map_sysaddr_to_csrow,
> + .dbam_to_cs = f15_dbam_to_chip_select,
> + .prep_chip_select = fmisc_prep_chip_selects,
> + .display_misc_regs = __dump_misc_regs,
> + .populate_csrows = init_csrows,
> +};
> +
> +static const struct low_ops f15m30_ops = {
> + .early_channel_count = f1x_early_channel_count,
> + .map_sysaddr_to_csrow = f1x_map_sysaddr_to_csrow,
> + .dbam_to_cs = f16_dbam_to_chip_select,
> + .prep_chip_select = f15m30_prep_chip_selects,
> + .display_misc_regs = __dump_misc_regs,
> + .populate_csrows = init_csrows,
> +};
> +
> +static const struct low_ops f16_x_ops = {

Why is this "f16_x" rather than "f15m60"?

> + .early_channel_count = f1x_early_channel_count,
> + .map_sysaddr_to_csrow = f1x_map_sysaddr_to_csrow,
> + .dbam_to_cs = f15_m60h_dbam_to_chip_select,
> + .prep_chip_select = fmisc_prep_chip_selects,
> + .display_misc_regs = __dump_misc_regs,
> + .populate_csrows = init_csrows,
> +};
> +
> +static const struct low_ops f16_ops = {
> + .early_channel_count = f1x_early_channel_count,
> + .map_sysaddr_to_csrow = f1x_map_sysaddr_to_csrow,
> + .dbam_to_cs = f16_dbam_to_chip_select,
> + .prep_chip_select = fmisc_prep_chip_selects,
> + .display_misc_regs = __dump_misc_regs,
> + .populate_csrows = init_csrows,
> +};
> +
> +static const struct low_ops f17_ops = {
> + .early_channel_count = f17_early_channel_count,
> + .dbam_to_cs = f17_addr_mask_to_cs_size,
> + .prep_chip_select = f17_prep_chip_selects,
> + .get_base_mask = read_umc_base_mask,
> + .display_misc_regs = __dump_misc_regs_df,
> + .get_mc_regs = __read_mc_regs_df,
> + .populate_csrows = init_csrows_df,
> + .get_umc_err_info = find_umc_channel,
> +};
> +
> static struct amd64_family_type family_types[] = {
> [K8_CPUS] = {
> .ctl_name = "K8",
> .f1_id = PCI_DEVICE_ID_AMD_K8_NB_ADDRMAP,
> .f2_id = PCI_DEVICE_ID_AMD_K8_NB_MEMCTL,
> .max_mcs = 2,
> - .ops = {
> - .early_channel_count = k8_early_channel_count,
> - .map_sysaddr_to_csrow = k8_map_sysaddr_to_csrow,
> - .dbam_to_cs = k8_dbam_to_chip_select,
> - }
> + .ops = k8_ops,
> },
> [F10_CPUS] = {
> .ctl_name = "F10h",
> .f1_id = PCI_DEVICE_ID_AMD_10H_NB_MAP,
> .f2_id = PCI_DEVICE_ID_AMD_10H_NB_DRAM,
> .max_mcs = 2,
> - .ops = {
> - .early_channel_count = f1x_early_channel_count,
> - .map_sysaddr_to_csrow = f1x_map_sysaddr_to_csrow,
> - .dbam_to_cs = f10_dbam_to_chip_select,
> - }
> + .ops = f10_ops,
> },
> [F15_CPUS] = {
> .ctl_name = "F15h",
> .f1_id = PCI_DEVICE_ID_AMD_15H_NB_F1,
> .f2_id = PCI_DEVICE_ID_AMD_15H_NB_F2,
> .max_mcs = 2,
> - .ops = {
> - .early_channel_count = f1x_early_channel_count,
> - .map_sysaddr_to_csrow = f1x_map_sysaddr_to_csrow,
> - .dbam_to_cs = f15_dbam_to_chip_select,
> - }
> + .ops = f15_ops,
> },
> [F15_M30H_CPUS] = {
> .ctl_name = "F15h_M30h",
> .f1_id = PCI_DEVICE_ID_AMD_15H_M30H_NB_F1,
> .f2_id = PCI_DEVICE_ID_AMD_15H_M30H_NB_F2,
> .max_mcs = 2,
> - .ops = {
> - .early_channel_count = f1x_early_channel_count,
> - .map_sysaddr_to_csrow = f1x_map_sysaddr_to_csrow,
> - .dbam_to_cs = f16_dbam_to_chip_select,
> - }
> + .ops = f15m30_ops,
> },
> [F15_M60H_CPUS] = {
> .ctl_name = "F15h_M60h",
> .f1_id = PCI_DEVICE_ID_AMD_15H_M60H_NB_F1,
> .f2_id = PCI_DEVICE_ID_AMD_15H_M60H_NB_F2,
> .max_mcs = 2,
> - .ops = {
> - .early_channel_count = f1x_early_channel_count,
> - .map_sysaddr_to_csrow = f1x_map_sysaddr_to_csrow,
> - .dbam_to_cs = f15_m60h_dbam_to_chip_select,
> - }
> + .ops = f16_x_ops,
> },
> [F16_CPUS] = {
> .ctl_name = "F16h",
> .f1_id = PCI_DEVICE_ID_AMD_16H_NB_F1,
> .f2_id = PCI_DEVICE_ID_AMD_16H_NB_F2,
> .max_mcs = 2,
> - .ops = {
> - .early_channel_count = f1x_early_channel_count,
> - .map_sysaddr_to_csrow = f1x_map_sysaddr_to_csrow,
> - .dbam_to_cs = f16_dbam_to_chip_select,
> - }
> + .ops = f16_ops,
> },
> [F16_M30H_CPUS] = {
> .ctl_name = "F16h_M30h",
> .f1_id = PCI_DEVICE_ID_AMD_16H_M30H_NB_F1,
> .f2_id = PCI_DEVICE_ID_AMD_16H_M30H_NB_F2,
> .max_mcs = 2,
> - .ops = {
> - .early_channel_count = f1x_early_channel_count,
> - .map_sysaddr_to_csrow = f1x_map_sysaddr_to_csrow,
> - .dbam_to_cs = f16_dbam_to_chip_select,
> - }
> + .ops = f16_ops,
> },
> [F17_CPUS] = {
> .ctl_name = "F17h",
> .f0_id = PCI_DEVICE_ID_AMD_17H_DF_F0,
> .f6_id = PCI_DEVICE_ID_AMD_17H_DF_F6,
> .max_mcs = 2,
> - .ops = {
> - .early_channel_count = f17_early_channel_count,
> - .dbam_to_cs = f17_addr_mask_to_cs_size,
> - }
> + .ops = f17_ops,
> },
> [F17_M10H_CPUS] = {
> .ctl_name = "F17h_M10h",
> .f0_id = PCI_DEVICE_ID_AMD_17H_M10H_DF_F0,
> .f6_id = PCI_DEVICE_ID_AMD_17H_M10H_DF_F6,
> .max_mcs = 2,
> - .ops = {
> - .early_channel_count = f17_early_channel_count,
> - .dbam_to_cs = f17_addr_mask_to_cs_size,
> - }
> + .ops = f17_ops,
> },
> [F17_M30H_CPUS] = {
> .ctl_name = "F17h_M30h",
> .f0_id = PCI_DEVICE_ID_AMD_17H_M30H_DF_F0,
> .f6_id = PCI_DEVICE_ID_AMD_17H_M30H_DF_F6,
> .max_mcs = 8,
> - .ops = {
> - .early_channel_count = f17_early_channel_count,
> - .dbam_to_cs = f17_addr_mask_to_cs_size,
> - }
> + .ops = f17_ops,
> },
> [F17_M60H_CPUS] = {
> .ctl_name = "F17h_M60h",
> .f0_id = PCI_DEVICE_ID_AMD_17H_M60H_DF_F0,
> .f6_id = PCI_DEVICE_ID_AMD_17H_M60H_DF_F6,
> .max_mcs = 2,
> - .ops = {
> - .early_channel_count = f17_early_channel_count,
> - .dbam_to_cs = f17_addr_mask_to_cs_size,
> - }
> + .ops = f17_ops,
> },
> [F17_M70H_CPUS] = {
> .ctl_name = "F17h_M70h",
> .f0_id = PCI_DEVICE_ID_AMD_17H_M70H_DF_F0,
> .f6_id = PCI_DEVICE_ID_AMD_17H_M70H_DF_F6,
> .max_mcs = 2,
> - .ops = {
> - .early_channel_count = f17_early_channel_count,
> - .dbam_to_cs = f17_addr_mask_to_cs_size,
> - }
> + .ops = f17_ops,
> },
> [F19_CPUS] = {
> .ctl_name = "F19h",
> .f0_id = PCI_DEVICE_ID_AMD_19H_DF_F0,
> .f6_id = PCI_DEVICE_ID_AMD_19H_DF_F6,
> .max_mcs = 8,
> - .ops = {
> - .early_channel_count = f17_early_channel_count,
> - .dbam_to_cs = f17_addr_mask_to_cs_size,
> - }
> + .ops = f17_ops,
> },
> };
>
> @@ -2900,9 +2937,10 @@ static inline void decode_bus_error(int node_id, struct mce *m)
> * the instance_id. For example, instance_id=0xYXXXXX where Y is the channel
> * number.
> */
> -static int find_umc_channel(struct mce *m)
> +static void find_umc_channel(struct mce *m, struct err_info *err)

This function now gets more than just the channel. Can this be reflected in
the name?

> {
> - return (m->ipid & GENMASK(31, 0)) >> 20;
> + err->channel = (m->ipid & GENMASK(31, 0)) >> 20;
> + err->csrow = m->synd & 0x7;
> }
>
> static void decode_umc_error(int node_id, struct mce *m)
> @@ -2924,7 +2962,7 @@ static void decode_umc_error(int node_id, struct mce *m)
> if (m->status & MCI_STATUS_DEFERRED)
> ecc_type = 3;
>
> - err.channel = find_umc_channel(m);
> + pvt->ops->get_umc_err_info(m, &err);

Because the "csrow" value is derived from the MCA_SYND value, this function
call should go after checking SYNDV below.

>
> if (!(m->status & MCI_STATUS_SYNDV)) {
> err.err_code = ERR_SYND;
> @@ -2940,8 +2978,6 @@ static void decode_umc_error(int node_id, struct mce *m)
> err.err_code = ERR_CHANNEL;
> }
>
> - err.csrow = m->synd & 0x7;
> -
> if (umc_normaddr_to_sysaddr(m->addr, pvt->mc_node_id, err.channel, &sys_addr)) {
> err.err_code = ERR_NORM_ADDR;
> goto log_error;
> @@ -3106,8 +3142,9 @@ static void read_mc_regs(struct amd64_pvt *pvt)
> edac_dbg(0, " TOP_MEM2 disabled\n");
> }
>
> - if (pvt->umc) {
> - __read_mc_regs_df(pvt);
> + if (pvt->ops->get_mc_regs) {
> + pvt->ops->get_mc_regs(pvt);
> +

I think this is okay for now. Maybe we can break up this function in a future
patch.

> amd64_read_pci_cfg(pvt->F0, DF_DHAR, &pvt->dhar);
>
> goto skip;
> @@ -3277,9 +3314,6 @@ static int init_csrows(struct mem_ctl_info *mci)
> int nr_pages = 0;
> u32 val;
>
> - if (pvt->umc)
> - return init_csrows_df(mci);
> -
> amd64_read_pci_cfg(pvt->F3, NBCFG, &val);
>
> pvt->nbcfg = val;
> @@ -3703,6 +3737,17 @@ static struct amd64_family_type *per_family_init(struct amd64_pvt *pvt)
> return NULL;
> }
>
> + /* ops required for all the families */
> + if (!pvt->ops->early_channel_count | !pvt->ops->prep_chip_select |
> + !pvt->ops->display_misc_regs | !pvt->ops->dbam_to_cs |
> + !pvt->ops->populate_csrows)
> + return NULL;
> +
> + /* ops required for families 17h and later */
> + if (pvt->fam >= 0x17 && (!pvt->ops->get_base_mask |
> + !pvt->ops->get_umc_err_info | !pvt->ops->get_mc_regs))
> + return NULL;
> +

Can you please add an EDAC debug message for these? I think that'll help track
down any coding bugs.

Also, all the "|" should be "||" right?

> return fam_type;
> }
>
> @@ -3786,7 +3831,7 @@ static int init_one_instance(struct amd64_pvt *pvt)
>
> setup_mci_misc_attrs(mci);
>
> - if (init_csrows(mci))
> + if (pvt->ops->populate_csrows(mci))
> mci->edac_cap = EDAC_FLAG_NONE;
>
> ret = -ENODEV;
> diff --git a/drivers/edac/amd64_edac.h b/drivers/edac/amd64_edac.h
> index 85aa820bc165..ce21b3cf0825 100644
> --- a/drivers/edac/amd64_edac.h
> +++ b/drivers/edac/amd64_edac.h
> @@ -472,6 +472,12 @@ struct low_ops {
> struct err_info *);
> int (*dbam_to_cs) (struct amd64_pvt *pvt, u8 dct,
> unsigned cs_mode, int cs_mask_nr);
> + void (*prep_chip_select)(struct amd64_pvt *pvt);
> + void (*get_base_mask)(struct amd64_pvt *pvt);
> + void (*display_misc_regs)(struct amd64_pvt *pvt);
> + void (*get_mc_regs)(struct amd64_pvt *pvt);
> + int (*populate_csrows)(struct mem_ctl_info *mci);
> + void (*get_umc_err_info)(struct mce *m, struct err_info *err);

Can you please align all the parathenses?

> };
>
> struct amd64_family_type {
> --

Thanks,
Yazen