[PATCH 0/4] EDAC/ghes: Some cleanups

[PATCH 0/4] EDAC/ghes: Some cleanups

[Borislav Petkov]

From: Borislav Petkov <bp@suse.de>

Hi,

here are some cleanups which came up recently.

Thx.

Borislav Petkov (2):
  EDAC/ghes: Scan the system once on driver init
  EDAC: Remove edac_get_dimm_by_index()

Robert Richter (2):
  EDAC/ghes: Setup DIMM label from DMI and use it in error reports
  EDAC/ghes: Remove unused members of struct ghes_edac_pvt, rename it to
    ghes_pvt

 drivers/edac/ghes_edac.c | 323 +++++++++++++++++++++++----------------
 include/linux/edac.h     |  29 +---
 2 files changed, 200 insertions(+), 152 deletions(-)

-- 
2.21.0

[PATCH 1/4] EDAC/ghes: Setup DIMM label from DMI and use it in error reports

[Borislav Petkov]

From: Robert Richter <rrichter@marvell.com>

The ghes driver reports errors with 'unknown label' even if the actual
DIMM label is known, e.g.:

 EDAC MC0: 1 CE Single-bit ECC on unknown label (node:0 card:0
   module:0 rank:1 bank:0 col:13 bit_pos:16 DIMM location:N0 DIMM_A0
   page:0x966a9b3 offset:0x0 grain:1 syndrome:0x0 - APEI location:
   node:0 card:0 module:0 rank:1 bank:0 col:13 bit_pos:16 DIMM
   location:N0 DIMM_A0 status(0x0000000000000400): Storage error in
   DRAM memory)

Fix this by using struct dimm_info's label string in error reports:

 EDAC MC0: 1 CE Single-bit ECC on N0 DIMM_A0 (node:0 card:0 module:0
   rank:1 bank:515 col:14 bit_pos:16 DIMM location:N0 DIMM_A0
   page:0x99223d8 offset:0x0 grain:1 syndrome:0x0 - APEI location:
   node:0 card:0 module:0 rank:1 bank:515 col:14 bit_pos:16 DIMM
   location:N0 DIMM_A0 status(0x0000000000000400): Storage error in
   DRAM memory)

The labels are initialized by reading the bank and device strings
from DMI. Now, the label information can also read from sysfs. E.g. a
ThunderX2 system will show the following:

  /sys/devices/system/edac/mc/mc0/dimm0/dimm_label:N0 DIMM_A0
  /sys/devices/system/edac/mc/mc0/dimm1/dimm_label:N0 DIMM_B0
  /sys/devices/system/edac/mc/mc0/dimm2/dimm_label:N0 DIMM_C0
  /sys/devices/system/edac/mc/mc0/dimm3/dimm_label:N0 DIMM_D0
  /sys/devices/system/edac/mc/mc0/dimm4/dimm_label:N0 DIMM_E0
  /sys/devices/system/edac/mc/mc0/dimm5/dimm_label:N0 DIMM_F0
  /sys/devices/system/edac/mc/mc0/dimm6/dimm_label:N0 DIMM_G0
  /sys/devices/system/edac/mc/mc0/dimm7/dimm_label:N0 DIMM_H0
  /sys/devices/system/edac/mc/mc0/dimm8/dimm_label:N1 DIMM_I0
  /sys/devices/system/edac/mc/mc0/dimm9/dimm_label:N1 DIMM_J0
  /sys/devices/system/edac/mc/mc0/dimm10/dimm_label:N1 DIMM_K0
  /sys/devices/system/edac/mc/mc0/dimm11/dimm_label:N1 DIMM_L0
  /sys/devices/system/edac/mc/mc0/dimm12/dimm_label:N1 DIMM_M0
  /sys/devices/system/edac/mc/mc0/dimm13/dimm_label:N1 DIMM_N0
  /sys/devices/system/edac/mc/mc0/dimm14/dimm_label:N1 DIMM_O0
  /sys/devices/system/edac/mc/mc0/dimm15/dimm_label:N1 DIMM_P0

Since dimm_labels can be rewritten, that label will be used in a later
error report:

  # echo foobar >/sys/devices/system/edac/mc/mc0/dimm0/dimm_label
  # # some error injection here
  # dmesg | grep foobar
  [ 751.383533] EDAC MC0: 1 CE Single-bit ECC on foobar (node:0 card:0
  module:0 rank:1 bank:259 col:3 bit_pos:16 DIMM location:N0 DIMM_A0
  page:0x8c8dc74 offset:0x0 grain:1 syndrome:0x0 - APEI location:
  node:0 card:0 module:0 rank:1 bank:259 col:3 bit_pos:16 DIMM
  location:N0 DIMM_A0 status(0x0000000000000400): Storage error in DRAM
  memory)

 [ bp: Remove curly brackets around a single if-statement in dimm_setup_label(). ]

Signed-off-by: Robert Richter <rrichter@marvell.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20200528101307.23245-1-rrichter@marvell.com
---
 drivers/edac/ghes_edac.c | 35 ++++++++++++++++++++++++-----------
 1 file changed, 24 insertions(+), 11 deletions(-)

diff --git a/drivers/edac/ghes_edac.c b/drivers/edac/ghes_edac.c
index cb3dab56a875..94c70c95a896 100644
--- a/drivers/edac/ghes_edac.c
+++ b/drivers/edac/ghes_edac.c
@@ -87,16 +87,27 @@ static void ghes_edac_count_dimms(const struct dmi_header *dh, void *arg)
 		(*num_dimm)++;
 }
 
-static int get_dimm_smbios_index(struct mem_ctl_info *mci, u16 handle)
+static struct dimm_info *find_dimm_by_handle(struct mem_ctl_info *mci, u16 handle)
 {
 	struct dimm_info *dimm;
 
 	mci_for_each_dimm(mci, dimm) {
 		if (dimm->smbios_handle == handle)
-			return dimm->idx;
+			return dimm;
 	}
 
-	return -1;
+	return NULL;
+}
+
+static void dimm_setup_label(struct dimm_info *dimm, u16 handle)
+{
+	const char *bank = NULL, *device = NULL;
+
+	dmi_memdev_name(handle, &bank, &device);
+
+	/* both strings must be non-zero */
+	if (bank && *bank && device && *device)
+		snprintf(dimm->label, sizeof(dimm->label), "%s %s", bank, device);
 }
 
 static void ghes_edac_dmidecode(const struct dmi_header *dh, void *arg)
@@ -179,9 +190,7 @@ static void ghes_edac_dmidecode(const struct dmi_header *dh, void *arg)
 		dimm->dtype = DEV_UNKNOWN;
 		dimm->grain = 128;		/* Likely, worse case */
 
-		/*
-		 * FIXME: It shouldn't be hard to also fill the DIMM labels
-		 */
+		dimm_setup_label(dimm, entry->handle);
 
 		if (dimm->nr_pages) {
 			edac_dbg(1, "DIMM%i: %s size = %d MB%s\n",
@@ -228,7 +237,6 @@ void ghes_edac_report_mem_error(int sev, struct cper_sec_mem_err *mem_err)
 	memset(e, 0, sizeof (*e));
 	e->error_count = 1;
 	e->grain = 1;
-	strcpy(e->label, "unknown label");
 	e->msg = pvt->msg;
 	e->other_detail = pvt->other_detail;
 	e->top_layer = -1;
@@ -345,7 +353,7 @@ void ghes_edac_report_mem_error(int sev, struct cper_sec_mem_err *mem_err)
 		p += sprintf(p, "bit_pos:%d ", mem_err->bit_pos);
 	if (mem_err->validation_bits & CPER_MEM_VALID_MODULE_HANDLE) {
 		const char *bank = NULL, *device = NULL;
-		int index = -1;
+		struct dimm_info *dimm;
 
 		dmi_memdev_name(mem_err->mem_dev_handle, &bank, &device);
 		if (bank != NULL && device != NULL)
@@ -354,13 +362,18 @@ void ghes_edac_report_mem_error(int sev, struct cper_sec_mem_err *mem_err)
 			p += sprintf(p, "DIMM DMI handle: 0x%.4x ",
 				     mem_err->mem_dev_handle);
 
-		index = get_dimm_smbios_index(mci, mem_err->mem_dev_handle);
-		if (index >= 0)
-			e->top_layer = index;
+		dimm = find_dimm_by_handle(mci, mem_err->mem_dev_handle);
+		if (dimm) {
+			e->top_layer = dimm->idx;
+			strcpy(e->label, dimm->label);
+		}
 	}
 	if (p > e->location)
 		*(p - 1) = '\0';
 
+	if (!*e->label)
+		strcpy(e->label, "unknown memory");
+
 	/* All other fields are mapped on e->other_detail */
 	p = pvt->other_detail;
 	p += snprintf(p, sizeof(pvt->other_detail),
-- 
2.21.0

[PATCH 2/4] EDAC/ghes: Remove unused members of struct ghes_edac_pvt, rename it to ghes_pvt

[Borislav Petkov]

From: Robert Richter <rrichter@marvell.com>

The struct members list and ghes of struct ghes_edac_pvt are unused,
remove them. On that occasion, rename it to the shorter name struct
ghes_pvt.

Signed-off-by: Robert Richter <rrichter@marvell.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20200519104443.15673-2-rrichter@marvell.com
---
 drivers/edac/ghes_edac.c | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/drivers/edac/ghes_edac.c b/drivers/edac/ghes_edac.c
index 94c70c95a896..f4f9ae32c743 100644
--- a/drivers/edac/ghes_edac.c
+++ b/drivers/edac/ghes_edac.c
@@ -15,9 +15,7 @@
 #include "edac_module.h"
 #include <ras/ras_event.h>
 
-struct ghes_edac_pvt {
-	struct list_head list;
-	struct ghes *ghes;
+struct ghes_pvt {
 	struct mem_ctl_info *mci;
 
 	/* Buffers for the error handling routine */
@@ -32,7 +30,7 @@ static refcount_t ghes_refcount = REFCOUNT_INIT(0);
  * also provides the necessary (implicit) memory barrier for the SMP
  * case to make the pointer visible on another CPU.
  */
-static struct ghes_edac_pvt *ghes_pvt;
+static struct ghes_pvt *ghes_pvt;
 
 /* GHES registration mutex */
 static DEFINE_MUTEX(ghes_reg_mutex);
@@ -212,7 +210,7 @@ void ghes_edac_report_mem_error(int sev, struct cper_sec_mem_err *mem_err)
 {
 	struct edac_raw_error_desc *e;
 	struct mem_ctl_info *mci;
-	struct ghes_edac_pvt *pvt;
+	struct ghes_pvt *pvt;
 	unsigned long flags;
 	char *p;
 
@@ -470,7 +468,7 @@ int ghes_edac_register(struct ghes *ghes, struct device *dev)
 	bool fake = false;
 	int rc = 0, num_dimm = 0;
 	struct mem_ctl_info *mci;
-	struct ghes_edac_pvt *pvt;
+	struct ghes_pvt *pvt;
 	struct edac_mc_layer layers[1];
 	struct ghes_edac_dimm_fill dimm_fill;
 	unsigned long flags;
@@ -507,7 +505,7 @@ int ghes_edac_register(struct ghes *ghes, struct device *dev)
 	layers[0].size = num_dimm;
 	layers[0].is_virt_csrow = true;
 
-	mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers, sizeof(struct ghes_edac_pvt));
+	mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers, sizeof(struct ghes_pvt));
 	if (!mci) {
 		pr_info("Can't allocate memory for EDAC data\n");
 		rc = -ENOMEM;
@@ -515,7 +513,6 @@ int ghes_edac_register(struct ghes *ghes, struct device *dev)
 	}
 
 	pvt		= mci->pvt_info;
-	pvt->ghes	= ghes;
 	pvt->mci	= mci;
 
 	mci->pdev = dev;
-- 
2.21.0

[PATCH 3/4] EDAC/ghes: Scan the system once on driver init

[Borislav Petkov]

From: Borislav Petkov <bp@suse.de>

Change the hardware scanning and figuring out how many DIMMs a machine
has to a single, one-time thing which happens once on driver init. After
that scanning completes, struct ghes_hw_desc contains a representation
of the hardware which the driver can then use for later initialization.

Then, copy the DIMM information into the respective EDAC core
representation of those.

Get rid of ghes_edac_dimm_fill and use a struct dimm_info array
directly.

This way, hw detection and further driver initialization is nicely
and logically split. Further additions should all be added to
ghes_scan_system() and the hw representation extended as needed.

There should be no functionality change resulting from this patch.

Signed-off-by: Borislav Petkov <bp@suse.de>
---
 drivers/edac/ghes_edac.c | 279 +++++++++++++++++++++++----------------
 1 file changed, 166 insertions(+), 113 deletions(-)

diff --git a/drivers/edac/ghes_edac.c b/drivers/edac/ghes_edac.c
index f4f9ae32c743..da60c29468a7 100644
--- a/drivers/edac/ghes_edac.c
+++ b/drivers/edac/ghes_edac.c
@@ -32,6 +32,15 @@ static refcount_t ghes_refcount = REFCOUNT_INIT(0);
  */
 static struct ghes_pvt *ghes_pvt;
 
+/*
+ * This driver's representation of the system hardware, as collected
+ * from DMI.
+ */
+struct ghes_hw_desc {
+	int num_dimms;
+	struct dimm_info *dimms;
+} ghes_hw;
+
 /* GHES registration mutex */
 static DEFINE_MUTEX(ghes_reg_mutex);
 
@@ -72,19 +81,6 @@ struct memdev_dmi_entry {
 	u16 conf_mem_clk_speed;
 } __attribute__((__packed__));
 
-struct ghes_edac_dimm_fill {
-	struct mem_ctl_info *mci;
-	unsigned int count;
-};
-
-static void ghes_edac_count_dimms(const struct dmi_header *dh, void *arg)
-{
-	int *num_dimm = arg;
-
-	if (dh->type == DMI_ENTRY_MEM_DEVICE)
-		(*num_dimm)++;
-}
-
 static struct dimm_info *find_dimm_by_handle(struct mem_ctl_info *mci, u16 handle)
 {
 	struct dimm_info *dimm;
@@ -108,102 +104,135 @@ static void dimm_setup_label(struct dimm_info *dimm, u16 handle)
 		snprintf(dimm->label, sizeof(dimm->label), "%s %s", bank, device);
 }
 
-static void ghes_edac_dmidecode(const struct dmi_header *dh, void *arg)
+static void assign_dmi_dimm_info(struct dimm_info *dimm, struct memdev_dmi_entry *entry)
 {
-	struct ghes_edac_dimm_fill *dimm_fill = arg;
-	struct mem_ctl_info *mci = dimm_fill->mci;
-
-	if (dh->type == DMI_ENTRY_MEM_DEVICE) {
-		struct memdev_dmi_entry *entry = (struct memdev_dmi_entry *)dh;
-		struct dimm_info *dimm = edac_get_dimm(mci, dimm_fill->count, 0, 0);
-		u16 rdr_mask = BIT(7) | BIT(13);
-
-		if (entry->size == 0xffff) {
-			pr_info("Can't get DIMM%i size\n",
-				dimm_fill->count);
-			dimm->nr_pages = MiB_TO_PAGES(32);/* Unknown */
-		} else if (entry->size == 0x7fff) {
-			dimm->nr_pages = MiB_TO_PAGES(entry->extended_size);
-		} else {
-			if (entry->size & BIT(15))
-				dimm->nr_pages = MiB_TO_PAGES((entry->size & 0x7fff) << 10);
-			else
-				dimm->nr_pages = MiB_TO_PAGES(entry->size);
-		}
+	u16 rdr_mask = BIT(7) | BIT(13);
 
-		switch (entry->memory_type) {
-		case 0x12:
-			if (entry->type_detail & BIT(13))
-				dimm->mtype = MEM_RDDR;
-			else
-				dimm->mtype = MEM_DDR;
-			break;
-		case 0x13:
-			if (entry->type_detail & BIT(13))
-				dimm->mtype = MEM_RDDR2;
-			else
-				dimm->mtype = MEM_DDR2;
-			break;
-		case 0x14:
-			dimm->mtype = MEM_FB_DDR2;
-			break;
-		case 0x18:
-			if (entry->type_detail & BIT(12))
-				dimm->mtype = MEM_NVDIMM;
-			else if (entry->type_detail & BIT(13))
-				dimm->mtype = MEM_RDDR3;
-			else
-				dimm->mtype = MEM_DDR3;
-			break;
-		case 0x1a:
-			if (entry->type_detail & BIT(12))
-				dimm->mtype = MEM_NVDIMM;
-			else if (entry->type_detail & BIT(13))
-				dimm->mtype = MEM_RDDR4;
-			else
-				dimm->mtype = MEM_DDR4;
-			break;
-		default:
-			if (entry->type_detail & BIT(6))
-				dimm->mtype = MEM_RMBS;
-			else if ((entry->type_detail & rdr_mask) == rdr_mask)
-				dimm->mtype = MEM_RDR;
-			else if (entry->type_detail & BIT(7))
-				dimm->mtype = MEM_SDR;
-			else if (entry->type_detail & BIT(9))
-				dimm->mtype = MEM_EDO;
-			else
-				dimm->mtype = MEM_UNKNOWN;
-		}
+	if (entry->size == 0xffff) {
+		pr_info("Can't get DIMM%i size\n", dimm->idx);
+		dimm->nr_pages = MiB_TO_PAGES(32);/* Unknown */
+	} else if (entry->size == 0x7fff) {
+		dimm->nr_pages = MiB_TO_PAGES(entry->extended_size);
+	} else {
+		if (entry->size & BIT(15))
+			dimm->nr_pages = MiB_TO_PAGES((entry->size & 0x7fff) << 10);
+		else
+			dimm->nr_pages = MiB_TO_PAGES(entry->size);
+	}
 
-		/*
-		 * Actually, we can only detect if the memory has bits for
-		 * checksum or not
-		 */
-		if (entry->total_width == entry->data_width)
-			dimm->edac_mode = EDAC_NONE;
+	switch (entry->memory_type) {
+	case 0x12:
+		if (entry->type_detail & BIT(13))
+			dimm->mtype = MEM_RDDR;
+		else
+			dimm->mtype = MEM_DDR;
+		break;
+	case 0x13:
+		if (entry->type_detail & BIT(13))
+			dimm->mtype = MEM_RDDR2;
 		else
-			dimm->edac_mode = EDAC_SECDED;
+			dimm->mtype = MEM_DDR2;
+		break;
+	case 0x14:
+		dimm->mtype = MEM_FB_DDR2;
+		break;
+	case 0x18:
+		if (entry->type_detail & BIT(12))
+			dimm->mtype = MEM_NVDIMM;
+		else if (entry->type_detail & BIT(13))
+			dimm->mtype = MEM_RDDR3;
+		else
+			dimm->mtype = MEM_DDR3;
+		break;
+	case 0x1a:
+		if (entry->type_detail & BIT(12))
+			dimm->mtype = MEM_NVDIMM;
+		else if (entry->type_detail & BIT(13))
+			dimm->mtype = MEM_RDDR4;
+		else
+			dimm->mtype = MEM_DDR4;
+		break;
+	default:
+		if (entry->type_detail & BIT(6))
+			dimm->mtype = MEM_RMBS;
+		else if ((entry->type_detail & rdr_mask) == rdr_mask)
+			dimm->mtype = MEM_RDR;
+		else if (entry->type_detail & BIT(7))
+			dimm->mtype = MEM_SDR;
+		else if (entry->type_detail & BIT(9))
+			dimm->mtype = MEM_EDO;
+		else
+			dimm->mtype = MEM_UNKNOWN;
+	}
 
-		dimm->dtype = DEV_UNKNOWN;
-		dimm->grain = 128;		/* Likely, worse case */
-
-		dimm_setup_label(dimm, entry->handle);
-
-		if (dimm->nr_pages) {
-			edac_dbg(1, "DIMM%i: %s size = %d MB%s\n",
-				dimm_fill->count, edac_mem_types[dimm->mtype],
-				PAGES_TO_MiB(dimm->nr_pages),
-				(dimm->edac_mode != EDAC_NONE) ? "(ECC)" : "");
-			edac_dbg(2, "\ttype %d, detail 0x%02x, width %d(total %d)\n",
-				entry->memory_type, entry->type_detail,
-				entry->total_width, entry->data_width);
-		}
+	/*
+	 * Actually, we can only detect if the memory has bits for
+	 * checksum or not
+	 */
+	if (entry->total_width == entry->data_width)
+		dimm->edac_mode = EDAC_NONE;
+	else
+		dimm->edac_mode = EDAC_SECDED;
+
+	dimm->dtype = DEV_UNKNOWN;
+	dimm->grain = 128;		/* Likely, worse case */
 
-		dimm->smbios_handle = entry->handle;
+	dimm_setup_label(dimm, entry->handle);
 
-		dimm_fill->count++;
+	if (dimm->nr_pages) {
+		edac_dbg(1, "DIMM%i: %s size = %d MB%s\n",
+			dimm->idx, edac_mem_types[dimm->mtype],
+			PAGES_TO_MiB(dimm->nr_pages),
+			(dimm->edac_mode != EDAC_NONE) ? "(ECC)" : "");
+		edac_dbg(2, "\ttype %d, detail 0x%02x, width %d(total %d)\n",
+			entry->memory_type, entry->type_detail,
+			entry->total_width, entry->data_width);
 	}
+
+	dimm->smbios_handle = entry->handle;
+}
+
+static void enumerate_dimms(const struct dmi_header *dh, void *arg)
+{
+	struct memdev_dmi_entry *entry = (struct memdev_dmi_entry *)dh;
+	struct ghes_hw_desc *hw = (struct ghes_hw_desc *)arg;
+	struct dimm_info *d;
+
+	if (dh->type != DMI_ENTRY_MEM_DEVICE)
+		return;
+
+	/* Enlarge the array with additional 16 */
+	if (!hw->num_dimms || !(hw->num_dimms % 16)) {
+		struct dimm_info *new;
+
+		new = krealloc(hw->dimms, (hw->num_dimms + 16) * sizeof(struct dimm_info),
+			        GFP_KERNEL);
+		if (!new) {
+			WARN_ON_ONCE(1);
+			return;
+		}
+
+		hw->dimms = new;
+	}
+
+	d = &hw->dimms[hw->num_dimms];
+	d->idx = hw->num_dimms;
+
+	assign_dmi_dimm_info(d, entry);
+
+	hw->num_dimms++;
+}
+
+static void ghes_scan_system(void)
+{
+	static bool scanned;
+
+	if (scanned)
+		return;
+
+	dmi_walk(enumerate_dimms, &ghes_hw);
+
+	scanned = true;
 }
 
 void ghes_edac_report_mem_error(int sev, struct cper_sec_mem_err *mem_err)
@@ -466,13 +495,12 @@ static struct acpi_platform_list plat_list[] = {
 int ghes_edac_register(struct ghes *ghes, struct device *dev)
 {
 	bool fake = false;
-	int rc = 0, num_dimm = 0;
 	struct mem_ctl_info *mci;
 	struct ghes_pvt *pvt;
 	struct edac_mc_layer layers[1];
-	struct ghes_edac_dimm_fill dimm_fill;
 	unsigned long flags;
 	int idx = -1;
+	int rc = 0;
 
 	if (IS_ENABLED(CONFIG_X86)) {
 		/* Check if safe to enable on this system */
@@ -492,17 +520,16 @@ int ghes_edac_register(struct ghes *ghes, struct device *dev)
 	if (refcount_inc_not_zero(&ghes_refcount))
 		goto unlock;
 
-	/* Get the number of DIMMs */
-	dmi_walk(ghes_edac_count_dimms, &num_dimm);
+	ghes_scan_system();
 
 	/* Check if we've got a bogus BIOS */
-	if (num_dimm == 0) {
+	if (!ghes_hw.num_dimms) {
 		fake = true;
-		num_dimm = 1;
+		ghes_hw.num_dimms = 1;
 	}
 
 	layers[0].type = EDAC_MC_LAYER_ALL_MEM;
-	layers[0].size = num_dimm;
+	layers[0].size = ghes_hw.num_dimms;
 	layers[0].is_virt_csrow = true;
 
 	mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers, sizeof(struct ghes_pvt));
@@ -533,13 +560,34 @@ int ghes_edac_register(struct ghes *ghes, struct device *dev)
 		pr_info("So, the end result of using this driver varies from vendor to vendor.\n");
 		pr_info("If you find incorrect reports, please contact your hardware vendor\n");
 		pr_info("to correct its BIOS.\n");
-		pr_info("This system has %d DIMM sockets.\n", num_dimm);
+		pr_info("This system has %d DIMM sockets.\n", ghes_hw.num_dimms);
 	}
 
 	if (!fake) {
-		dimm_fill.count = 0;
-		dimm_fill.mci = mci;
-		dmi_walk(ghes_edac_dmidecode, &dimm_fill);
+		struct dimm_info *src, *dst;
+		int i = 0;
+
+		mci_for_each_dimm(mci, dst) {
+			src = &ghes_hw.dimms[i];
+
+			dst->idx	   = src->idx;
+			dst->smbios_handle = src->smbios_handle;
+			dst->nr_pages	   = src->nr_pages;
+			dst->mtype	   = src->mtype;
+			dst->edac_mode	   = src->edac_mode;
+			dst->dtype	   = src->dtype;
+			dst->grain	   = src->grain;
+
+			/*
+			 * If no src->label, preserve default label assigned
+			 * from EDAC core.
+			 */
+			if (strlen(src->label))
+				memcpy(dst->label, src->label, sizeof(src->label));
+
+			i++;
+		}
+
 	} else {
 		struct dimm_info *dimm = edac_get_dimm(mci, 0, 0, 0);
 
@@ -552,7 +600,7 @@ int ghes_edac_register(struct ghes *ghes, struct device *dev)
 
 	rc = edac_mc_add_mc(mci);
 	if (rc < 0) {
-		pr_info("Can't register at EDAC core\n");
+		pr_info("Can't register with the EDAC core\n");
 		edac_mc_free(mci);
 		rc = -ENODEV;
 		goto unlock;
@@ -566,6 +614,11 @@ int ghes_edac_register(struct ghes *ghes, struct device *dev)
 	refcount_set(&ghes_refcount, 1);
 
 unlock:
+
+	/* Not needed anymore */
+	kfree(ghes_hw.dimms);
+	ghes_hw.dimms = NULL;
+
 	mutex_unlock(&ghes_reg_mutex);
 
 	return rc;
-- 
2.21.0

[PATCH 4/4] EDAC: Remove edac_get_dimm_by_index()

[Borislav Petkov]

From: Borislav Petkov <bp@suse.de>

It is unused now.

Signed-off-by: Borislav Petkov <bp@suse.de>
---
 include/linux/edac.h | 29 +++++++----------------------
 1 file changed, 7 insertions(+), 22 deletions(-)

diff --git a/include/linux/edac.h b/include/linux/edac.h
index 6eb7d55d7c3d..15e8f3d8a895 100644
--- a/include/linux/edac.h
+++ b/include/linux/edac.h
@@ -594,27 +594,6 @@ struct mem_ctl_info {
 		     ? (mci)->dimms[(dimm)->idx + 1]		\
 		     : NULL)
 
-/**
- * edac_get_dimm_by_index - Get DIMM info at @index from a memory
- * 			    controller
- *
- * @mci:	MC descriptor struct mem_ctl_info
- * @index:	index in the memory controller's DIMM array
- *
- * Returns a struct dimm_info * or NULL on failure.
- */
-static inline struct dimm_info *
-edac_get_dimm_by_index(struct mem_ctl_info *mci, int index)
-{
-	if (index < 0 || index >= mci->tot_dimms)
-		return NULL;
-
-	if (WARN_ON_ONCE(mci->dimms[index]->idx != index))
-		return NULL;
-
-	return mci->dimms[index];
-}
-
 /**
  * edac_get_dimm - Get DIMM info from a memory controller given by
  *                 [layer0,layer1,layer2] position
@@ -650,6 +629,12 @@ static inline struct dimm_info *edac_get_dimm(struct mem_ctl_info *mci,
 	if (mci->n_layers > 2)
 		index = index * mci->layers[2].size + layer2;
 
-	return edac_get_dimm_by_index(mci, index);
+	if (index < 0 || index >= mci->tot_dimms)
+		return NULL;
+
+	if (WARN_ON_ONCE(mci->dimms[index]->idx != index))
+		return NULL;
+
+	return mci->dimms[index];
 }
 #endif /* _LINUX_EDAC_H_ */
-- 
2.21.0

Re: [PATCH 0/4] EDAC/ghes: Some cleanups

[Borislav Petkov]

On Tue, Jun 16, 2020 at 07:27:33PM +0200, Borislav Petkov wrote:
> From: Borislav Petkov <bp@suse.de>
> 
> Hi,
> 
> here are some cleanups which came up recently.
> 
> Thx.
> 
> Borislav Petkov (2):
>   EDAC/ghes: Scan the system once on driver init
>   EDAC: Remove edac_get_dimm_by_index()
> 
> Robert Richter (2):
>   EDAC/ghes: Setup DIMM label from DMI and use it in error reports
>   EDAC/ghes: Remove unused members of struct ghes_edac_pvt, rename it to
>     ghes_pvt
> 
>  drivers/edac/ghes_edac.c | 323 +++++++++++++++++++++++----------------
>  include/linux/edac.h     |  29 +---
>  2 files changed, 200 insertions(+), 152 deletions(-)

Queued for 5.9.

-- 
Regards/Gruss,
    Boris.

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