linux-kernel - [PATCH 3/4] sb_edac: support for duplicate device IDs

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Message-Id: <1449136134-23706-4-git-send-email-hubert.chrzaniuk@intel.com>
Date:	Thu,  3 Dec 2015 10:48:53 +0100
From:	Hubert Chrzaniuk <hubert.chrzaniuk@...el.com>
To:	hubert.chrzaniuk@...el.com, lukasz.anaczkowski@...el.com,
	mchehab@....samsung.com, dougthompson@...ssion.com, bp@...en8.de
Cc:	linux-edac@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jim Snow <jim.m.snow@...el.com>
Subject: [PATCH 3/4] sb_edac: support for duplicate device IDs

From: Jim Snow <jim.m.snow@...el.com>

Add options to sbridge_get_all_devices to allow
for duplicate device IDs and devices that are scattered
across mulitple PCI buses.

Signed-off-by: Jim Snow <jim.m.snow@...el.com>
[hubert.chrzaniuk@...el.com: patch rebase to 4.4-rc3]
Signed-off-by: Hubert Chrzaniuk <hubert.chrzaniuk@...el.com>
---
 drivers/edac/sb_edac.c | 40 ++++++++++++++++++++++++++++++++--------
 1 file changed, 32 insertions(+), 8 deletions(-)

diff --git a/drivers/edac/sb_edac.c b/drivers/edac/sb_edac.c
index 2e50a3e..c8fbde2 100644
--- a/drivers/edac/sb_edac.c
+++ b/drivers/edac/sb_edac.c
@@ -637,10 +637,19 @@ static inline int numcol(u32 mtr)
 	return 1 << cols;
 }
 
-static struct sbridge_dev *get_sbridge_dev(u8 bus)
+static struct sbridge_dev *get_sbridge_dev(u8 bus, int multi_bus)
 {
 	struct sbridge_dev *sbridge_dev;
 
+	/*
+	 * If we have devices scattered across several busses that pertain
+	 * to the same memory controller, we'll lump them all together.
+	 */
+	if (multi_bus) {
+		return list_first_entry_or_null(&sbridge_edac_list,
+				struct sbridge_dev, list);
+	}
+
 	list_for_each_entry(sbridge_dev, &sbridge_edac_list, list) {
 		if (sbridge_dev->bus == bus)
 			return sbridge_dev;
@@ -1588,7 +1597,8 @@ static void sbridge_put_all_devices(void)
 static int sbridge_get_onedevice(struct pci_dev **prev,
 				 u8 *num_mc,
 				 const struct pci_id_table *table,
-				 const unsigned devno)
+				 const unsigned devno,
+				 const int multi_bus)
 {
 	struct sbridge_dev *sbridge_dev;
 	const struct pci_id_descr *dev_descr = &table->descr[devno];
@@ -1624,7 +1634,7 @@ static int sbridge_get_onedevice(struct pci_dev **prev,
 	}
 	bus = pdev->bus->number;
 
-	sbridge_dev = get_sbridge_dev(bus);
+	sbridge_dev = get_sbridge_dev(bus, multi_bus);
 	if (!sbridge_dev) {
 		sbridge_dev = alloc_sbridge_dev(bus, table);
 		if (!sbridge_dev) {
@@ -1673,21 +1683,32 @@ static int sbridge_get_onedevice(struct pci_dev **prev,
  * @num_mc: pointer to the memory controllers count, to be incremented in case
  *	    of success.
  * @table: model specific table
+ * @allow_dups: allow for multiple devices to exist with the same device id
+ *              (as implemented, this isn't expected to work correctly in the
+ *              multi-socket case).
+ * @multi_bus: don't assume devices on different buses belong to different
+ *             memory controllers.
  *
  * returns 0 in case of success or error code
  */
-static int sbridge_get_all_devices(u8 *num_mc,
-				   const struct pci_id_table *table)
+static int sbridge_get_all_devices_full(u8 *num_mc,
+					const struct pci_id_table *table,
+					int allow_dups,
+					int multi_bus)
 {
 	int i, rc;
 	struct pci_dev *pdev = NULL;
 
 	while (table && table->descr) {
 		for (i = 0; i < table->n_devs; i++) {
-			pdev = NULL;
+			if (!allow_dups || i == 0 ||
+					table->descr[i].dev_id !=
+						table->descr[i-1].dev_id) {
+				pdev = NULL;
+			}
 			do {
 				rc = sbridge_get_onedevice(&pdev, num_mc,
-							   table, i);
+							   table, i, multi_bus);
 				if (rc < 0) {
 					if (i == 0) {
 						i = table->n_devs;
@@ -1696,7 +1717,7 @@ static int sbridge_get_all_devices(u8 *num_mc,
 					sbridge_put_all_devices();
 					return -ENODEV;
 				}
-			} while (pdev);
+			} while (pdev && !allow_dups);
 		}
 		table++;
 	}
@@ -1704,6 +1725,9 @@ static int sbridge_get_all_devices(u8 *num_mc,
 	return 0;
 }
 
+#define sbridge_get_all_devices(num_mc, table) \
+		sbridge_get_all_devices_full(num_mc, table, 0, 0)
+
 static int sbridge_mci_bind_devs(struct mem_ctl_info *mci,
 				 struct sbridge_dev *sbridge_dev)
 {
-- 
1.8.3.1

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