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linux-next/drivers/edac/ie31200_edac.c
Borislav Petkov c54182ec0e EDAC: Get rid of mci->mod_ver 
It is a write-only variable so get rid of it.

Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Robert Richter <rric@kernel.org>
Acked-by: Michal Simek <michal.simek@xilinx.com>
Acked-by: Thor Thayer <thor.thayer@linux.intel.com>
Acked-by: Tony Luck <tony.luck@intel.com>
Cc: Mark Gross <mark.gross@intel.com>
Cc: Tim Small <tim@buttersideup.com>
Cc: Ranganathan Desikan <ravi@jetztechnologies.com>
Cc: "Arvind R." <arvino55@gmail.com>
Cc: Jason Baron <jbaron@akamai.com>
Cc: "Sören Brinkmann" <soren.brinkmann@xilinx.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: David Daney <david.daney@cavium.com>
Cc: Loc Ho <lho@apm.com>
Cc: linux-edac@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-mips@linux-mips.org
2017-07-17 13:42:48 +02:00

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/*
* Intel E3-1200
* Copyright (C) 2014 Jason Baron <jbaron@akamai.com>
*
* Support for the E3-1200 processor family. Heavily based on previous
* Intel EDAC drivers.
*
* Since the DRAM controller is on the cpu chip, we can use its PCI device
* id to identify these processors.
*
* PCI DRAM controller device ids (Taken from The PCI ID Repository - http://pci-ids.ucw.cz/)
*
* 0108: Xeon E3-1200 Processor Family DRAM Controller
* 010c: Xeon E3-1200/2nd Generation Core Processor Family DRAM Controller
* 0150: Xeon E3-1200 v2/3rd Gen Core processor DRAM Controller
* 0158: Xeon E3-1200 v2/Ivy Bridge DRAM Controller
* 015c: Xeon E3-1200 v2/3rd Gen Core processor DRAM Controller
* 0c04: Xeon E3-1200 v3/4th Gen Core Processor DRAM Controller
* 0c08: Xeon E3-1200 v3 Processor DRAM Controller
* 1918: Xeon E3-1200 v5 Skylake Host Bridge/DRAM Registers
* 5918: Xeon E3-1200 Xeon E3-1200 v6/7th Gen Core Processor Host Bridge/DRAM Registers
*
* Based on Intel specification:
* http://www.intel.com/content/dam/www/public/us/en/documents/datasheets/xeon-e3-1200v3-vol-2-datasheet.pdf
* http://www.intel.com/content/www/us/en/processors/xeon/xeon-e3-1200-family-vol-2-datasheet.html
* http://www.intel.com/content/www/us/en/processors/core/7th-gen-core-family-mobile-h-processor-lines-datasheet-vol-2.html
*
* According to the above datasheet (p.16):
* "
* 6. Software must not access B0/D0/F0 32-bit memory-mapped registers with
* requests that cross a DW boundary.
* "
*
* Thus, we make use of the explicit: lo_hi_readq(), which breaks the readq into
* 2 readl() calls. This restriction may be lifted in subsequent chip releases,
* but lo_hi_readq() ensures that we are safe across all e3-1200 processors.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/pci_ids.h>
#include <linux/edac.h>
#include <linux/io-64-nonatomic-lo-hi.h>
#include "edac_module.h"
#define EDAC_MOD_STR "ie31200_edac"
#define ie31200_printk(level, fmt, arg...) \
edac_printk(level, "ie31200", fmt, ##arg)
#define PCI_DEVICE_ID_INTEL_IE31200_HB_1 0x0108
#define PCI_DEVICE_ID_INTEL_IE31200_HB_2 0x010c
#define PCI_DEVICE_ID_INTEL_IE31200_HB_3 0x0150
#define PCI_DEVICE_ID_INTEL_IE31200_HB_4 0x0158
#define PCI_DEVICE_ID_INTEL_IE31200_HB_5 0x015c
#define PCI_DEVICE_ID_INTEL_IE31200_HB_6 0x0c04
#define PCI_DEVICE_ID_INTEL_IE31200_HB_7 0x0c08
#define PCI_DEVICE_ID_INTEL_IE31200_HB_8 0x1918
#define PCI_DEVICE_ID_INTEL_IE31200_HB_9 0x5918
#define IE31200_DIMMS 4
#define IE31200_RANKS 8
#define IE31200_RANKS_PER_CHANNEL 4
#define IE31200_DIMMS_PER_CHANNEL 2
#define IE31200_CHANNELS 2
/* Intel IE31200 register addresses - device 0 function 0 - DRAM Controller */
#define IE31200_MCHBAR_LOW 0x48
#define IE31200_MCHBAR_HIGH 0x4c
#define IE31200_MCHBAR_MASK GENMASK_ULL(38, 15)
#define IE31200_MMR_WINDOW_SIZE BIT(15)
/*
* Error Status Register (16b)
*
* 15 reserved
* 14 Isochronous TBWRR Run Behind FIFO Full
* (ITCV)
* 13 Isochronous TBWRR Run Behind FIFO Put
* (ITSTV)
* 12 reserved
* 11 MCH Thermal Sensor Event
* for SMI/SCI/SERR (GTSE)
* 10 reserved
* 9 LOCK to non-DRAM Memory Flag (LCKF)
* 8 reserved
* 7 DRAM Throttle Flag (DTF)
* 6:2 reserved
* 1 Multi-bit DRAM ECC Error Flag (DMERR)
* 0 Single-bit DRAM ECC Error Flag (DSERR)
*/
#define IE31200_ERRSTS 0xc8
#define IE31200_ERRSTS_UE BIT(1)
#define IE31200_ERRSTS_CE BIT(0)
#define IE31200_ERRSTS_BITS (IE31200_ERRSTS_UE | IE31200_ERRSTS_CE)
/*
* Channel 0 ECC Error Log (64b)
*
* 63:48 Error Column Address (ERRCOL)
* 47:32 Error Row Address (ERRROW)
* 31:29 Error Bank Address (ERRBANK)
* 28:27 Error Rank Address (ERRRANK)
* 26:24 reserved
* 23:16 Error Syndrome (ERRSYND)
* 15: 2 reserved
* 1 Multiple Bit Error Status (MERRSTS)
* 0 Correctable Error Status (CERRSTS)
*/
#define IE31200_C0ECCERRLOG 0x40c8
#define IE31200_C1ECCERRLOG 0x44c8
#define IE31200_C0ECCERRLOG_SKL 0x4048
#define IE31200_C1ECCERRLOG_SKL 0x4448
#define IE31200_ECCERRLOG_CE BIT(0)
#define IE31200_ECCERRLOG_UE BIT(1)
#define IE31200_ECCERRLOG_RANK_BITS GENMASK_ULL(28, 27)
#define IE31200_ECCERRLOG_RANK_SHIFT 27
#define IE31200_ECCERRLOG_SYNDROME_BITS GENMASK_ULL(23, 16)
#define IE31200_ECCERRLOG_SYNDROME_SHIFT 16
#define IE31200_ECCERRLOG_SYNDROME(log) \
((log & IE31200_ECCERRLOG_SYNDROME_BITS) >> \
IE31200_ECCERRLOG_SYNDROME_SHIFT)
#define IE31200_CAPID0 0xe4
#define IE31200_CAPID0_PDCD BIT(4)
#define IE31200_CAPID0_DDPCD BIT(6)
#define IE31200_CAPID0_ECC BIT(1)
#define IE31200_MAD_DIMM_0_OFFSET 0x5004
#define IE31200_MAD_DIMM_0_OFFSET_SKL 0x500C
#define IE31200_MAD_DIMM_SIZE GENMASK_ULL(7, 0)
#define IE31200_MAD_DIMM_A_RANK BIT(17)
#define IE31200_MAD_DIMM_A_RANK_SHIFT 17
#define IE31200_MAD_DIMM_A_RANK_SKL BIT(10)
#define IE31200_MAD_DIMM_A_RANK_SKL_SHIFT 10
#define IE31200_MAD_DIMM_A_WIDTH BIT(19)
#define IE31200_MAD_DIMM_A_WIDTH_SHIFT 19
#define IE31200_MAD_DIMM_A_WIDTH_SKL GENMASK_ULL(9, 8)
#define IE31200_MAD_DIMM_A_WIDTH_SKL_SHIFT 8
/* Skylake reports 1GB increments, everything else is 256MB */
#define IE31200_PAGES(n, skl) \
(n << (28 + (2 * skl) - PAGE_SHIFT))
static int nr_channels;
struct ie31200_priv {
void __iomem *window;
void __iomem *c0errlog;
void __iomem *c1errlog;
};
enum ie31200_chips {
IE31200 = 0,
};
struct ie31200_dev_info {
const char *ctl_name;
};
struct ie31200_error_info {
u16 errsts;
u16 errsts2;
u64 eccerrlog[IE31200_CHANNELS];
};
static const struct ie31200_dev_info ie31200_devs[] = {
[IE31200] = {
.ctl_name = "IE31200"
},
};
struct dimm_data {
u8 size; /* in multiples of 256MB, except Skylake is 1GB */
u8 dual_rank : 1,
x16_width : 2; /* 0 means x8 width */
};
static int how_many_channels(struct pci_dev *pdev)
{
int n_channels;
unsigned char capid0_2b; /* 2nd byte of CAPID0 */
pci_read_config_byte(pdev, IE31200_CAPID0 + 1, &capid0_2b);
/* check PDCD: Dual Channel Disable */
if (capid0_2b & IE31200_CAPID0_PDCD) {
edac_dbg(0, "In single channel mode\n");
n_channels = 1;
} else {
edac_dbg(0, "In dual channel mode\n");
n_channels = 2;
}
/* check DDPCD - check if both channels are filled */
if (capid0_2b & IE31200_CAPID0_DDPCD)
edac_dbg(0, "2 DIMMS per channel disabled\n");
else
edac_dbg(0, "2 DIMMS per channel enabled\n");
return n_channels;
}
static bool ecc_capable(struct pci_dev *pdev)
{
unsigned char capid0_4b; /* 4th byte of CAPID0 */
pci_read_config_byte(pdev, IE31200_CAPID0 + 3, &capid0_4b);
if (capid0_4b & IE31200_CAPID0_ECC)
return false;
return true;
}
static int eccerrlog_row(u64 log)
{
return ((log & IE31200_ECCERRLOG_RANK_BITS) >>
IE31200_ECCERRLOG_RANK_SHIFT);
}
static void ie31200_clear_error_info(struct mem_ctl_info *mci)
{
/*
* Clear any error bits.
* (Yes, we really clear bits by writing 1 to them.)
*/
pci_write_bits16(to_pci_dev(mci->pdev), IE31200_ERRSTS,
IE31200_ERRSTS_BITS, IE31200_ERRSTS_BITS);
}
static void ie31200_get_and_clear_error_info(struct mem_ctl_info *mci,
struct ie31200_error_info *info)
{
struct pci_dev *pdev;
struct ie31200_priv *priv = mci->pvt_info;
pdev = to_pci_dev(mci->pdev);
/*
* This is a mess because there is no atomic way to read all the
* registers at once and the registers can transition from CE being
* overwritten by UE.
*/
pci_read_config_word(pdev, IE31200_ERRSTS, &info->errsts);
if (!(info->errsts & IE31200_ERRSTS_BITS))
return;
info->eccerrlog[0] = lo_hi_readq(priv->c0errlog);
if (nr_channels == 2)
info->eccerrlog[1] = lo_hi_readq(priv->c1errlog);
pci_read_config_word(pdev, IE31200_ERRSTS, &info->errsts2);
/*
* If the error is the same for both reads then the first set
* of reads is valid. If there is a change then there is a CE
* with no info and the second set of reads is valid and
* should be UE info.
*/
if ((info->errsts ^ info->errsts2) & IE31200_ERRSTS_BITS) {
info->eccerrlog[0] = lo_hi_readq(priv->c0errlog);
if (nr_channels == 2)
info->eccerrlog[1] =
lo_hi_readq(priv->c1errlog);
}
ie31200_clear_error_info(mci);
}
static void ie31200_process_error_info(struct mem_ctl_info *mci,
struct ie31200_error_info *info)
{
int channel;
u64 log;
if (!(info->errsts & IE31200_ERRSTS_BITS))
return;
if ((info->errsts ^ info->errsts2) & IE31200_ERRSTS_BITS) {
edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1, 0, 0, 0,
-1, -1, -1, "UE overwrote CE", "");
info->errsts = info->errsts2;
}
for (channel = 0; channel < nr_channels; channel++) {
log = info->eccerrlog[channel];
if (log & IE31200_ECCERRLOG_UE) {
edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
0, 0, 0,
eccerrlog_row(log),
channel, -1,
"ie31200 UE", "");
} else if (log & IE31200_ECCERRLOG_CE) {
edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1,
0, 0,
IE31200_ECCERRLOG_SYNDROME(log),
eccerrlog_row(log),
channel, -1,
"ie31200 CE", "");
}
}
}
static void ie31200_check(struct mem_ctl_info *mci)
{
struct ie31200_error_info info;
edac_dbg(1, "MC%d\n", mci->mc_idx);
ie31200_get_and_clear_error_info(mci, &info);
ie31200_process_error_info(mci, &info);
}
static void __iomem *ie31200_map_mchbar(struct pci_dev *pdev)
{
union {
u64 mchbar;
struct {
u32 mchbar_low;
u32 mchbar_high;
};
} u;
void __iomem *window;
pci_read_config_dword(pdev, IE31200_MCHBAR_LOW, &u.mchbar_low);
pci_read_config_dword(pdev, IE31200_MCHBAR_HIGH, &u.mchbar_high);
u.mchbar &= IE31200_MCHBAR_MASK;
if (u.mchbar != (resource_size_t)u.mchbar) {
ie31200_printk(KERN_ERR, "mmio space beyond accessible range (0x%llx)\n",
(unsigned long long)u.mchbar);
return NULL;
}
window = ioremap_nocache(u.mchbar, IE31200_MMR_WINDOW_SIZE);
if (!window)
ie31200_printk(KERN_ERR, "Cannot map mmio space at 0x%llx\n",
(unsigned long long)u.mchbar);
return window;
}
static void __skl_populate_dimm_info(struct dimm_data *dd, u32 addr_decode,
int chan)
{
dd->size = (addr_decode >> (chan << 4)) & IE31200_MAD_DIMM_SIZE;
dd->dual_rank = (addr_decode & (IE31200_MAD_DIMM_A_RANK_SKL << (chan << 4))) ? 1 : 0;
dd->x16_width = ((addr_decode & (IE31200_MAD_DIMM_A_WIDTH_SKL << (chan << 4))) >>
(IE31200_MAD_DIMM_A_WIDTH_SKL_SHIFT + (chan << 4)));
}
static void __populate_dimm_info(struct dimm_data *dd, u32 addr_decode,
int chan)
{
dd->size = (addr_decode >> (chan << 3)) & IE31200_MAD_DIMM_SIZE;
dd->dual_rank = (addr_decode & (IE31200_MAD_DIMM_A_RANK << chan)) ? 1 : 0;
dd->x16_width = (addr_decode & (IE31200_MAD_DIMM_A_WIDTH << chan)) ? 1 : 0;
}
static void populate_dimm_info(struct dimm_data *dd, u32 addr_decode, int chan,
bool skl)
{
if (skl)
__skl_populate_dimm_info(dd, addr_decode, chan);
else
__populate_dimm_info(dd, addr_decode, chan);
}
static int ie31200_probe1(struct pci_dev *pdev, int dev_idx)
{
int i, j, ret;
struct mem_ctl_info *mci = NULL;
struct edac_mc_layer layers[2];
struct dimm_data dimm_info[IE31200_CHANNELS][IE31200_DIMMS_PER_CHANNEL];
void __iomem *window;
struct ie31200_priv *priv;
u32 addr_decode, mad_offset;
/*
* Kaby Lake seems to work like Skylake. Please re-visit this logic
* when adding new CPU support.
*/
bool skl = (pdev->device >= PCI_DEVICE_ID_INTEL_IE31200_HB_8);
edac_dbg(0, "MC:\n");
if (!ecc_capable(pdev)) {
ie31200_printk(KERN_INFO, "No ECC support\n");
return -ENODEV;
}
nr_channels = how_many_channels(pdev);
layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
layers[0].size = IE31200_DIMMS;
layers[0].is_virt_csrow = true;
layers[1].type = EDAC_MC_LAYER_CHANNEL;
layers[1].size = nr_channels;
layers[1].is_virt_csrow = false;
mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers,
sizeof(struct ie31200_priv));
if (!mci)
return -ENOMEM;
window = ie31200_map_mchbar(pdev);
if (!window) {
ret = -ENODEV;
goto fail_free;
}
edac_dbg(3, "MC: init mci\n");
mci->pdev = &pdev->dev;
if (skl)
mci->mtype_cap = MEM_FLAG_DDR4;
else
mci->mtype_cap = MEM_FLAG_DDR3;
mci->edac_ctl_cap = EDAC_FLAG_SECDED;
mci->edac_cap = EDAC_FLAG_SECDED;
mci->mod_name = EDAC_MOD_STR;
mci->ctl_name = ie31200_devs[dev_idx].ctl_name;
mci->dev_name = pci_name(pdev);
mci->edac_check = ie31200_check;
mci->ctl_page_to_phys = NULL;
priv = mci->pvt_info;
priv->window = window;
if (skl) {
priv->c0errlog = window + IE31200_C0ECCERRLOG_SKL;
priv->c1errlog = window + IE31200_C1ECCERRLOG_SKL;
mad_offset = IE31200_MAD_DIMM_0_OFFSET_SKL;
} else {
priv->c0errlog = window + IE31200_C0ECCERRLOG;
priv->c1errlog = window + IE31200_C1ECCERRLOG;
mad_offset = IE31200_MAD_DIMM_0_OFFSET;
}
/* populate DIMM info */
for (i = 0; i < IE31200_CHANNELS; i++) {
addr_decode = readl(window + mad_offset +
(i * 4));
edac_dbg(0, "addr_decode: 0x%x\n", addr_decode);
for (j = 0; j < IE31200_DIMMS_PER_CHANNEL; j++) {
populate_dimm_info(&dimm_info[i][j], addr_decode, j,
skl);
edac_dbg(0, "size: 0x%x, rank: %d, width: %d\n",
dimm_info[i][j].size,
dimm_info[i][j].dual_rank,
dimm_info[i][j].x16_width);
}
}
/*
* The dram rank boundary (DRB) reg values are boundary addresses
* for each DRAM rank with a granularity of 64MB. DRB regs are
* cumulative; the last one will contain the total memory
* contained in all ranks.
*/
for (i = 0; i < IE31200_DIMMS_PER_CHANNEL; i++) {
for (j = 0; j < IE31200_CHANNELS; j++) {
struct dimm_info *dimm;
unsigned long nr_pages;
nr_pages = IE31200_PAGES(dimm_info[j][i].size, skl);
if (nr_pages == 0)
continue;
if (dimm_info[j][i].dual_rank) {
nr_pages = nr_pages / 2;
dimm = EDAC_DIMM_PTR(mci->layers, mci->dimms,
mci->n_layers, (i * 2) + 1,
j, 0);
dimm->nr_pages = nr_pages;
edac_dbg(0, "set nr pages: 0x%lx\n", nr_pages);
dimm->grain = 8; /* just a guess */
if (skl)
dimm->mtype = MEM_DDR4;
else
dimm->mtype = MEM_DDR3;
dimm->dtype = DEV_UNKNOWN;
dimm->edac_mode = EDAC_UNKNOWN;
}
dimm = EDAC_DIMM_PTR(mci->layers, mci->dimms,
mci->n_layers, i * 2, j, 0);
dimm->nr_pages = nr_pages;
edac_dbg(0, "set nr pages: 0x%lx\n", nr_pages);
dimm->grain = 8; /* same guess */
if (skl)
dimm->mtype = MEM_DDR4;
else
dimm->mtype = MEM_DDR3;
dimm->dtype = DEV_UNKNOWN;
dimm->edac_mode = EDAC_UNKNOWN;
}
}
ie31200_clear_error_info(mci);
if (edac_mc_add_mc(mci)) {
edac_dbg(3, "MC: failed edac_mc_add_mc()\n");
ret = -ENODEV;
goto fail_unmap;
}
/* get this far and it's successful */
edac_dbg(3, "MC: success\n");
return 0;
fail_unmap:
iounmap(window);
fail_free:
edac_mc_free(mci);
return ret;
}
static int ie31200_init_one(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
edac_dbg(0, "MC:\n");
if (pci_enable_device(pdev) < 0)
return -EIO;
return ie31200_probe1(pdev, ent->driver_data);
}
static void ie31200_remove_one(struct pci_dev *pdev)
{
struct mem_ctl_info *mci;
struct ie31200_priv *priv;
edac_dbg(0, "\n");
mci = edac_mc_del_mc(&pdev->dev);
if (!mci)
return;
priv = mci->pvt_info;
iounmap(priv->window);
edac_mc_free(mci);
}
static const struct pci_device_id ie31200_pci_tbl[] = {
{
PCI_VEND_DEV(INTEL, IE31200_HB_1), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
IE31200},
{
PCI_VEND_DEV(INTEL, IE31200_HB_2), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
IE31200},
{
PCI_VEND_DEV(INTEL, IE31200_HB_3), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
IE31200},
{
PCI_VEND_DEV(INTEL, IE31200_HB_4), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
IE31200},
{
PCI_VEND_DEV(INTEL, IE31200_HB_5), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
IE31200},
{
PCI_VEND_DEV(INTEL, IE31200_HB_6), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
IE31200},
{
PCI_VEND_DEV(INTEL, IE31200_HB_7), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
IE31200},
{
PCI_VEND_DEV(INTEL, IE31200_HB_8), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
IE31200},
{
PCI_VEND_DEV(INTEL, IE31200_HB_9), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
IE31200},
{
0,
} /* 0 terminated list. */
};
MODULE_DEVICE_TABLE(pci, ie31200_pci_tbl);
static struct pci_driver ie31200_driver = {
.name = EDAC_MOD_STR,
.probe = ie31200_init_one,
.remove = ie31200_remove_one,
.id_table = ie31200_pci_tbl,
};
static int __init ie31200_init(void)
{
edac_dbg(3, "MC:\n");
/* Ensure that the OPSTATE is set correctly for POLL or NMI */
opstate_init();
return pci_register_driver(&ie31200_driver);
}
static void __exit ie31200_exit(void)
{
edac_dbg(3, "MC:\n");
pci_unregister_driver(&ie31200_driver);
}
module_init(ie31200_init);
module_exit(ie31200_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jason Baron <jbaron@akamai.com>");
MODULE_DESCRIPTION("MC support for Intel Processor E31200 memory hub controllers");
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