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Date: Tue, 2 Sep 2014 09:08:40 +0200
From: Borislav Petkov <bp@...en8.de>
To: Aravind Gopalakrishnan <aravind.gopalakrishnan@....com>
Cc: dougthompson@...ssion.com, m.chehab@...sung.com,
linux-edac@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2] edac, amd64_edac: Modify usage of
amd64_read_dct_pci_cfg()
On Tue, Aug 26, 2014 at 12:44:09PM -0500, Aravind Gopalakrishnan wrote:
> Rationale behind this change:
> - F2x1xx addresses were stopped from being mapped explicitly to DCT1
> from F15h (OR) onwards. They use _dct[0:1] mechanism to access the
> registers. So we should move away from using address ranges to select
> DCT for these families.
> - On newer processors, the address ranges used to indicate DCT1 (0x140,
> 0x1a0) have different meanings than what is assumed currently.
>
> Changes introduced:
> - amd64_read_dct_pci_cfg() now takes in dct value and uses it for
> 'selecting the dct'
> - Update usage of the function
> - Remove [k8|f10]_read_dct_pci_cfg() as they don't do much different
> from amd64_read_pci_cfg().
> - Move the k8 specific check to amd64_read_pci_cfg
> - Remove now needless .read_dct_pci_cfg
>
> Testing:
> - Tested on Fam 10h; Fam15h Models: 00h, 30h; Fam16h using 'EDAC_DEBUG'
> and mce_amd_inj
> - driver obtains info from F2x registers and caches it in pvt
> structures correctly
> - ECC decoding wotks fine
>
> Signed-off-by: Aravind Gopalakrishnan <aravind.gopalakrishnan@....com>
> ---
> Changes in V2: (per Boris suggestion)
> - Hide family checks in amd64_read_dct_pci_cfg()
> - Use pvt structure for family checks and not boot_cpu_data
>
> drivers/edac/amd64_edac.c | 134 ++++++++++++++++++++++------------------------
> drivers/edac/amd64_edac.h | 23 ++++++--
> 2 files changed, 83 insertions(+), 74 deletions(-)
>
> diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
> index f8bf000..ba0b78e 100644
> --- a/drivers/edac/amd64_edac.c
> +++ b/drivers/edac/amd64_edac.c
> @@ -60,6 +60,20 @@ static const struct scrubrate {
> { 0x00, 0UL}, /* scrubbing off */
> };
>
> +/*
> + * Depending on the family, F2 DCT reads need special handling:
> + *
> + * K8: has a single DCT only and no address offsets >= 0x100
> + *
> + * F10h: each DCT has its own set of regs
> + * DCT0 -> F2x040..
> + * DCT1 -> F2x140..
> + *
> + * F16h: has only 1 DCT
> + *
> + * For all above families, we should use the 'raw' version
> + * i.e, amd64_read_pci_cfg() function
> + */
> int __amd64_read_pci_cfg_dword(struct pci_dev *pdev, int offset,
> u32 *val, const char *func)
> {
> @@ -87,35 +101,6 @@ int __amd64_write_pci_cfg_dword(struct pci_dev *pdev, int offset,
> }
>
> /*
> - *
> - * Depending on the family, F2 DCT reads need special handling:
> - *
> - * K8: has a single DCT only
> - *
> - * F10h: each DCT has its own set of regs
> - * DCT0 -> F2x040..
> - * DCT1 -> F2x140..
> - *
> - * F15h: we select which DCT we access using F1x10C[DctCfgSel]
> - *
> - * F16h: has only 1 DCT
> - */
> -static int k8_read_dct_pci_cfg(struct amd64_pvt *pvt, int addr, u32 *val,
> - const char *func)
> -{
> - if (addr >= 0x100)
> - return -EINVAL;
> -
> - return __amd64_read_pci_cfg_dword(pvt->F2, addr, val, func);
> -}
> -
> -static int f10_read_dct_pci_cfg(struct amd64_pvt *pvt, int addr, u32 *val,
> - const char *func)
> -{
> - return __amd64_read_pci_cfg_dword(pvt->F2, addr, val, func);
> -}
> -
> -/*
> * Select DCT to which PCI cfg accesses are routed
> */
> static void f15h_select_dct(struct amd64_pvt *pvt, u8 dct)
> @@ -128,19 +113,14 @@ static void f15h_select_dct(struct amd64_pvt *pvt, u8 dct)
> amd64_write_pci_cfg(pvt->F1, DCT_CFG_SEL, reg);
> }
>
> -static int f15_read_dct_pci_cfg(struct amd64_pvt *pvt, int addr, u32 *val,
> - const char *func)
> +/*
> + * F15h: F2x1xx addresses do not map explicitly to DCT1.
> + * We should select which DCT we access using F1x10C[DctCfgSel]
> + */
> +int f15_read_dct_pci_cfg(struct amd64_pvt *pvt, u8 dct, int addr, u32 *val,
> + const char *func)
> {
> - u8 dct = 0;
> -
> - /* For F15 M30h, the second dct is DCT 3, refer to BKDG Section 2.10 */
> - if (addr >= 0x140 && addr <= 0x1a0) {
> - dct = (pvt->model >= 0x30) ? 3 : 1;
> - addr -= 0x100;
> - }
> -
> f15h_select_dct(pvt, dct);
> -
> return __amd64_read_pci_cfg_dword(pvt->F2, addr, val, func);
> }
>
> @@ -767,17 +747,21 @@ static void read_dct_base_mask(struct amd64_pvt *pvt)
> int reg1 = DCSB1 + (cs * 4);
> u32 *base0 = &pvt->csels[0].csbases[cs];
> u32 *base1 = &pvt->csels[1].csbases[cs];
> + u8 dct = 0;
>
> - if (!amd64_read_dct_pci_cfg(pvt, reg0, base0))
> + if (!amd64_read_dct_pci_cfg(pvt, dct, reg0, base0))
> edac_dbg(0, " DCSB0[%d]=0x%08x reg: F2x%x\n",
> cs, *base0, reg0);
>
> - if (pvt->fam == 0xf || dct_ganging_enabled(pvt))
> + if (pvt->fam == 0xf)
> continue;
>
> - if (!amd64_read_dct_pci_cfg(pvt, reg1, base1))
> + dct = ((pvt->fam == 0x15)
> + && (pvt->model == 0x30)) ? 3 : 1;
That selection can go into amd64_read_dct_pci_cfg() too, right?
> + if (!amd64_read_dct_pci_cfg(pvt, dct, reg0, base1))
> edac_dbg(0, " DCSB1[%d]=0x%08x reg: F2x%x\n",
> - cs, *base1, reg1);
> + cs, *base1, (pvt->fam == 0x10) ? reg1
> + : reg0);
> }
>
> for_each_chip_select_mask(cs, 0, pvt) {
> @@ -785,17 +769,21 @@ static void read_dct_base_mask(struct amd64_pvt *pvt)
> int reg1 = DCSM1 + (cs * 4);
> u32 *mask0 = &pvt->csels[0].csmasks[cs];
> u32 *mask1 = &pvt->csels[1].csmasks[cs];
> + u8 dct = 0;
>
> - if (!amd64_read_dct_pci_cfg(pvt, reg0, mask0))
> + if (!amd64_read_dct_pci_cfg(pvt, dct, reg0, mask0))
> edac_dbg(0, " DCSM0[%d]=0x%08x reg: F2x%x\n",
> cs, *mask0, reg0);
>
> - if (pvt->fam == 0xf || dct_ganging_enabled(pvt))
> + if (pvt->fam == 0xf)
> continue;
>
> - if (!amd64_read_dct_pci_cfg(pvt, reg1, mask1))
> + dct = ((pvt->fam == 0x15)
> + && (pvt->model == 0x30)) ? 3 : 1;
> + if (!amd64_read_dct_pci_cfg(pvt, dct, reg0, mask1))
> edac_dbg(0, " DCSM1[%d]=0x%08x reg: F2x%x\n",
> - cs, *mask1, reg1);
> + cs, *mask1, (pvt->fam == 0x10) ? reg1
> + : reg0);
> }
> }
>
> @@ -1198,7 +1186,7 @@ static void read_dram_ctl_register(struct amd64_pvt *pvt)
> if (pvt->fam == 0xf)
> return;
>
> - if (!amd64_read_dct_pci_cfg(pvt, DCT_SEL_LO, &pvt->dct_sel_lo)) {
> + if (!amd64_read_pci_cfg(pvt->F2, DCT_SEL_LO, &pvt->dct_sel_lo)) {
> edac_dbg(0, "F2x110 (DCTSelLow): 0x%08x, High range addrs at: 0x%x\n",
> pvt->dct_sel_lo, dct_sel_baseaddr(pvt));
>
> @@ -1219,7 +1207,7 @@ static void read_dram_ctl_register(struct amd64_pvt *pvt)
> dct_sel_interleave_addr(pvt));
> }
>
> - amd64_read_dct_pci_cfg(pvt, DCT_SEL_HI, &pvt->dct_sel_hi);
> + amd64_read_pci_cfg(pvt->F2, DCT_SEL_HI, &pvt->dct_sel_hi);
> }
>
> /*
> @@ -1430,7 +1418,7 @@ static u64 f1x_swap_interleaved_region(struct amd64_pvt *pvt, u64 sys_addr)
> return sys_addr;
> }
>
> - amd64_read_dct_pci_cfg(pvt, SWAP_INTLV_REG, &swap_reg);
> + amd64_read_pci_cfg(pvt->F2, SWAP_INTLV_REG, &swap_reg);
>
> if (!(swap_reg & 0x1))
> return sys_addr;
> @@ -1723,9 +1711,16 @@ static void debug_display_dimm_sizes(struct amd64_pvt *pvt, u8 ctrl)
> WARN_ON(ctrl != 0);
> }
>
> - dbam = (ctrl && !dct_ganging_enabled(pvt)) ? pvt->dbam1 : pvt->dbam0;
> - dcsb = (ctrl && !dct_ganging_enabled(pvt)) ? pvt->csels[1].csbases
> - : pvt->csels[0].csbases;
> + if (pvt->fam == 0x10) {
> + dbam = (ctrl && !dct_ganging_enabled(pvt)) ? pvt->dbam1
> + : pvt->dbam0;
> + dcsb = (ctrl && !dct_ganging_enabled(pvt)) ?
> + pvt->csels[1].csbases :
> + pvt->csels[0].csbases;
> + } else if (ctrl) {
> + dbam = pvt->dbam0;
> + dcsb = pvt->csels[1].csbases;
> + }
>
> edac_dbg(1, "F2x%d80 (DRAM Bank Address Mapping): 0x%08x\n",
> ctrl, dbam);
> @@ -1760,7 +1755,6 @@ static struct amd64_family_type family_types[] = {
> .early_channel_count = k8_early_channel_count,
> .map_sysaddr_to_csrow = k8_map_sysaddr_to_csrow,
> .dbam_to_cs = k8_dbam_to_chip_select,
> - .read_dct_pci_cfg = k8_read_dct_pci_cfg,
> }
> },
> [F10_CPUS] = {
> @@ -1771,7 +1765,6 @@ static struct amd64_family_type family_types[] = {
> .early_channel_count = f1x_early_channel_count,
> .map_sysaddr_to_csrow = f1x_map_sysaddr_to_csrow,
> .dbam_to_cs = f10_dbam_to_chip_select,
> - .read_dct_pci_cfg = f10_read_dct_pci_cfg,
> }
> },
> [F15_CPUS] = {
> @@ -1782,7 +1775,6 @@ static struct amd64_family_type family_types[] = {
> .early_channel_count = f1x_early_channel_count,
> .map_sysaddr_to_csrow = f1x_map_sysaddr_to_csrow,
> .dbam_to_cs = f15_dbam_to_chip_select,
> - .read_dct_pci_cfg = f15_read_dct_pci_cfg,
> }
> },
> [F15_M30H_CPUS] = {
> @@ -1793,7 +1785,6 @@ static struct amd64_family_type family_types[] = {
> .early_channel_count = f1x_early_channel_count,
> .map_sysaddr_to_csrow = f1x_map_sysaddr_to_csrow,
> .dbam_to_cs = f16_dbam_to_chip_select,
> - .read_dct_pci_cfg = f15_read_dct_pci_cfg,
> }
> },
> [F16_CPUS] = {
> @@ -1804,7 +1795,6 @@ static struct amd64_family_type family_types[] = {
> .early_channel_count = f1x_early_channel_count,
> .map_sysaddr_to_csrow = f1x_map_sysaddr_to_csrow,
> .dbam_to_cs = f16_dbam_to_chip_select,
> - .read_dct_pci_cfg = f10_read_dct_pci_cfg,
> }
> },
> [F16_M30H_CPUS] = {
> @@ -1815,7 +1805,6 @@ static struct amd64_family_type family_types[] = {
> .early_channel_count = f1x_early_channel_count,
> .map_sysaddr_to_csrow = f1x_map_sysaddr_to_csrow,
> .dbam_to_cs = f16_dbam_to_chip_select,
> - .read_dct_pci_cfg = f10_read_dct_pci_cfg,
> }
> },
> };
> @@ -2102,6 +2091,7 @@ static void read_mc_regs(struct amd64_pvt *pvt)
> unsigned range;
> u64 msr_val;
> u32 tmp;
> + u8 dct = 0;
>
> /*
> * Retrieve TOP_MEM and TOP_MEM2; no masking off of reserved bits since
> @@ -2148,25 +2138,29 @@ static void read_mc_regs(struct amd64_pvt *pvt)
> read_dct_base_mask(pvt);
>
> amd64_read_pci_cfg(pvt->F1, DHAR, &pvt->dhar);
> - amd64_read_dct_pci_cfg(pvt, DBAM0, &pvt->dbam0);
> + amd64_read_dct_pci_cfg(pvt, dct, DBAM0, &pvt->dbam0);
>
> amd64_read_pci_cfg(pvt->F3, F10_ONLINE_SPARE, &pvt->online_spare);
>
> - amd64_read_dct_pci_cfg(pvt, DCLR0, &pvt->dclr0);
> - amd64_read_dct_pci_cfg(pvt, DCHR0, &pvt->dchr0);
> + amd64_read_dct_pci_cfg(pvt, dct, DCLR0, &pvt->dclr0);
> + amd64_read_dct_pci_cfg(pvt, dct, DCHR0, &pvt->dchr0);
>
> - if (!dct_ganging_enabled(pvt)) {
> - amd64_read_dct_pci_cfg(pvt, DCLR1, &pvt->dclr1);
> - amd64_read_dct_pci_cfg(pvt, DCHR1, &pvt->dchr1);
> - }
> + dct = ((pvt->fam == 0x15)
> + && (pvt->model == 0x30)) ? 3 : 1;
> + amd64_read_dct_pci_cfg(pvt, dct, DCLR0, &pvt->dclr1);
> + amd64_read_dct_pci_cfg(pvt, dct, DCHR0, &pvt->dchr1);
>
> pvt->ecc_sym_sz = 4;
>
> if (pvt->fam >= 0x10) {
> amd64_read_pci_cfg(pvt->F3, EXT_NB_MCA_CFG, &tmp);
> - if (pvt->fam != 0x16)
> - /* F16h has only DCT0 */
> - amd64_read_dct_pci_cfg(pvt, DBAM1, &pvt->dbam1);
> + if (pvt->fam == 0x10)
> + amd64_read_pci_cfg(pvt->F2, DBAM1, &pvt->dbam1);
> + /* F16h has only DCT0, so no need to read dbam1 */
> + else if (pvt->fam == 0x15) {
This logic can be moved into amd64_read_dct_pci_cfg() too?
I think you can get rid of the f15_read_dct_pci_cfg() completely and
move the logic into amd64_read_dct_pci_cfg()
--
Regards/Gruss,
Boris.
--
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