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SubjectRe: [PATCH v2 2/2] EDAC/amd64: Add new register offset support and related changes
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On 15/12/2021 16:53, Yazen Ghannam wrote:
> Introduce a "family flags" bitmask that can be used to indicate any
> special behavior needed on a per-family basis.
>
> Add a flag to indicate a system uses the new register offsets introduced
> with Family 19h Model 10h.
>
> Use this flag to account for register offset changes, a new bitfield
> indicating DDR5 use on a memory controller, and to set the proper number
> of chip select masks.
>
> Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
> ---
> Link:
> https://lkml.kernel.org/r/20211208174356.1997855-5-yazen.ghannam@amd.com
>
> v1->v2:
> * Was patch 4 in v1.
> * Change "has_ddr5" flag to "zn_regs_v2".
> * Drop flag check helper function.
> * Update determine_memory_type() to check bitfield for DDR5.
> * Update code comments.
>
> drivers/edac/amd64_edac.c | 59 +++++++++++++++++++++++++++++++++++----
> drivers/edac/amd64_edac.h | 14 ++++++++++
> 2 files changed, 67 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
> index 1df763128483..b7dd87636155 100644
> --- a/drivers/edac/amd64_edac.c
> +++ b/drivers/edac/amd64_edac.c
> @@ -15,6 +15,31 @@ static struct msr __percpu *msrs;
>
> static struct amd64_family_type *fam_type;
>
> +/* Family flag helpers */
> +static inline u64 get_addr_cfg(void)
> +{
> + if (fam_type->flags.zn_regs_v2)
> + return UMCCH_ADDR_CFG_DDR5;
> +
> + return UMCCH_ADDR_CFG;
> +}
> +
> +static inline u64 get_addr_mask_sec(void)
> +{
> + if (fam_type->flags.zn_regs_v2)
> + return UMCCH_ADDR_MASK_SEC_DDR5;
> +
> + return UMCCH_ADDR_MASK_SEC;
> +}
> +
> +static inline u64 get_dimm_cfg(void)
> +{
> + if (fam_type->flags.zn_regs_v2)
> + return UMCCH_DIMM_CFG_DDR5;
> +
> + return UMCCH_DIMM_CFG;
> +}
> +
> /* Per-node stuff */
> static struct ecc_settings **ecc_stngs;
>
> @@ -1429,8 +1454,10 @@ static void __dump_misc_regs_df(struct amd64_pvt *pvt)
> edac_dbg(1, "UMC%d x16 DIMMs present: %s\n",
> i, (umc->dimm_cfg & BIT(7)) ? "yes" : "no");
>
> - if (pvt->dram_type == MEM_LRDDR4) {
> - amd_smn_read(pvt->mc_node_id, umc_base + UMCCH_ADDR_CFG, &tmp);
> + if (pvt->dram_type == MEM_LRDDR4 || pvt->dram_type == MEM_LRDDR5) {
> + amd_smn_read(pvt->mc_node_id,
> + umc_base + get_addr_cfg(),
> + &tmp);
> edac_dbg(1, "UMC%d LRDIMM %dx rank multiply\n",
> i, 1 << ((tmp >> 4) & 0x3));
> }
> @@ -1505,7 +1532,7 @@ static void prep_chip_selects(struct amd64_pvt *pvt)
>
> for_each_umc(umc) {
> pvt->csels[umc].b_cnt = 4;
> - pvt->csels[umc].m_cnt = 2;
> + pvt->csels[umc].m_cnt = fam_type->flags.zn_regs_v2 ? 4 : 2;
> }
>
> } else {
> @@ -1545,7 +1572,7 @@ static void read_umc_base_mask(struct amd64_pvt *pvt)
> }
>
> umc_mask_reg = get_umc_base(umc) + UMCCH_ADDR_MASK;
> - umc_mask_reg_sec = get_umc_base(umc) + UMCCH_ADDR_MASK_SEC;
> + umc_mask_reg_sec = get_umc_base(umc) + get_addr_mask_sec();
>
> for_each_chip_select_mask(cs, umc, pvt) {
> mask = &pvt->csels[umc].csmasks[cs];
> @@ -1628,6 +1655,20 @@ static void determine_memory_type(struct amd64_pvt *pvt)
> dimm_cfg |= pvt->umc[i].dimm_cfg;
> }
>
> + /*
> + * Check if the system supports the "DDR Type" field in UMC Config
> + * and has DDR5 DIMMs in use.
> + */
> + if (fam_type->flags.zn_regs_v2 && ((umc_cfg & GENMASK(2, 0)) == 0x1)) {
> + if (dimm_cfg & BIT(5))
> + pvt->dram_type = MEM_LRDDR5;
> + else if (dimm_cfg & BIT(4))
> + pvt->dram_type = MEM_RDDR5;
> + else
> + pvt->dram_type = MEM_DDR5;
> + return;
> + }
> +
> if (dimm_cfg & BIT(5))
> pvt->dram_type = MEM_LRDDR4;
> else if (dimm_cfg & BIT(4))
> @@ -2174,8 +2215,13 @@ static int f17_addr_mask_to_cs_size(struct amd64_pvt *pvt, u8 umc,
> * There is one mask per DIMM, and two Chip Selects per DIMM.
> * CS0 and CS1 -> DIMM0
> * CS2 and CS3 -> DIMM1
> + *
> + * Systems with newer register layout have one mask per Chip Select.

Just a question about this comment: Can it be translated into this ?

+ * Except on systems with newer register layout where we have one Chip Select per DIMM.

> */
> - dimm = csrow_nr >> 1;
> + if (fam_type->flags.zn_regs_v2)
> + dimm = csrow_nr;
> + else
> + dimm = csrow_nr >> 1;
>
> /* Asymmetric dual-rank DIMM support. */
> if ((csrow_nr & 1) && (cs_mode & CS_ODD_SECONDARY))
> @@ -2937,6 +2983,7 @@ static struct amd64_family_type family_types[] = {
> .f0_id = PCI_DEVICE_ID_AMD_19H_M10H_DF_F0,
> .f6_id = PCI_DEVICE_ID_AMD_19H_M10H_DF_F6,
> .max_mcs = 12,
> + .flags.zn_regs_v2 = 1,
> .ops = {
> .early_channel_count = f17_early_channel_count,
> .dbam_to_cs = f17_addr_mask_to_cs_size,
> @@ -3365,7 +3412,7 @@ static void __read_mc_regs_df(struct amd64_pvt *pvt)
> umc_base = get_umc_base(i);
> umc = &pvt->umc[i];
>
> - amd_smn_read(nid, umc_base + UMCCH_DIMM_CFG, &umc->dimm_cfg);
> + amd_smn_read(nid, umc_base + get_dimm_cfg(), &umc->dimm_cfg);
> amd_smn_read(nid, umc_base + UMCCH_UMC_CFG, &umc->umc_cfg);
> amd_smn_read(nid, umc_base + UMCCH_SDP_CTRL, &umc->sdp_ctrl);
> amd_smn_read(nid, umc_base + UMCCH_ECC_CTRL, &umc->ecc_ctrl);
> diff --git a/drivers/edac/amd64_edac.h b/drivers/edac/amd64_edac.h
> index 650cab401e21..39ecb77873db 100644
> --- a/drivers/edac/amd64_edac.h
> +++ b/drivers/edac/amd64_edac.h
> @@ -271,8 +271,11 @@
> #define UMCCH_BASE_ADDR_SEC 0x10
> #define UMCCH_ADDR_MASK 0x20
> #define UMCCH_ADDR_MASK_SEC 0x28
> +#define UMCCH_ADDR_MASK_SEC_DDR5 0x30
> #define UMCCH_ADDR_CFG 0x30
> +#define UMCCH_ADDR_CFG_DDR5 0x40
> #define UMCCH_DIMM_CFG 0x80
> +#define UMCCH_DIMM_CFG_DDR5 0x90
> #define UMCCH_UMC_CFG 0x100
> #define UMCCH_SDP_CTRL 0x104
> #define UMCCH_ECC_CTRL 0x14C
> @@ -477,11 +480,22 @@ struct low_ops {
> unsigned cs_mode, int cs_mask_nr);
> };
>
> +struct amd64_family_flags {
> + /*
> + * Indicates that the system supports the new register offsets, etc.
> + * first introduced with Family 19h Model 10h.
> + */
> + __u64 zn_regs_v2 : 1,
> +
> + __reserved : 63;
> +};
> +
> struct amd64_family_type {
> const char *ctl_name;
> u16 f0_id, f1_id, f2_id, f6_id;
> /* Maximum number of memory controllers per die/node. */
> u8 max_mcs;
> + struct amd64_family_flags flags;
> struct low_ops ops;
> };
>
Thanks in advance,

William.


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