EDAC, sb_edac: Use cpu family/model in driver detection
Instead of picking a random PCI ID from the dozen or so we need to
access, just use x86_match_cpu() to pick based on CPU model number. The
choosing of PCI devices has been problematic in the past, see
11249e739929 ("sb_edac: Fix detection on SNB machines")
which fixed problems introduced by
d0585cd815fa ("sb_edac: Claim a different PCI device").
This is especially ugly if future hardware might not even have
EDAC-relevant registers in PCI config space and we would still be
required to choose some "random" PCI devices to scan for just so our
driver loads.
Is this cleaner/clearer? It deletes much more code than it adds. Only
tested on Broadwell. The driver loads/unloads and loads again. Still
decodes errors too.
Signed-off-by: Tony Luck <tony.luck@intel.com>
Suggested-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
diff --git a/drivers/edac/sb_edac.c b/drivers/edac/sb_edac.c
index 3421674..be398e0 100644
--- a/drivers/edac/sb_edac.c
+++ b/drivers/edac/sb_edac.c
@@ -21,6 +21,8 @@
#include <linux/smp.h>
#include <linux/bitmap.h>
#include <linux/math64.h>
+#include <linux/mod_devicetable.h>
+#include <asm/cpu_device_id.h>
#include <asm/processor.h>
#include <asm/mce.h>
@@ -28,8 +30,6 @@
/* Static vars */
static LIST_HEAD(sbridge_edac_list);
-static DEFINE_MUTEX(sbridge_edac_lock);
-static int probed;
/*
* Alter this version for the module when modifications are made
@@ -651,18 +651,6 @@
{0,} /* 0 terminated list. */
};
-/*
- * pci_device_id table for which devices we are looking for
- */
-static const struct pci_device_id sbridge_pci_tbl[] = {
- {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_HA0)},
- {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA0_TA)},
- {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA0)},
- {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA0)},
- {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_KNL_IMC_SAD0)},
- {0,} /* 0 terminated list. */
-};
-
/****************************************************************************
Ancillary status routines
@@ -3344,62 +3332,40 @@
return rc;
}
+#define ICPU(model, table) \
+ { X86_VENDOR_INTEL, 6, model, 0, (unsigned long)&table }
+
+/* Order here must match "enum type" */
+static const struct x86_cpu_id sbridge_cpuids[] = {
+ ICPU(0x2d, pci_dev_descr_sbridge_table), /* SANDY_BRIDGE */
+ ICPU(0x3e, pci_dev_descr_ibridge_table), /* IVY_BRIDGE */
+ ICPU(0x3f, pci_dev_descr_haswell_table), /* HASWELL */
+ ICPU(0x4f, pci_dev_descr_broadwell_table), /* BROADWELL */
+ ICPU(0x57, pci_dev_descr_knl_table), /* KNIGHTS_LANDING */
+ { }
+};
+MODULE_DEVICE_TABLE(x86cpu, sbridge_cpuids);
+
/*
- * sbridge_probe Probe for ONE instance of device to see if it is
+ * sbridge_probe Get all devices and register memory controllers
* present.
* return:
* 0 for FOUND a device
* < 0 for error code
*/
-static int sbridge_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+static int sbridge_probe(const struct x86_cpu_id *id)
{
int rc = -ENODEV;
u8 mc, num_mc = 0;
struct sbridge_dev *sbridge_dev;
- enum type type = SANDY_BRIDGE;
+ struct pci_id_table *ptable = (struct pci_id_table *)id->driver_data;
/* get the pci devices we want to reserve for our use */
- mutex_lock(&sbridge_edac_lock);
+ rc = sbridge_get_all_devices(&num_mc, ptable);
- /*
- * All memory controllers are allocated at the first pass.
- */
- if (unlikely(probed >= 1)) {
- mutex_unlock(&sbridge_edac_lock);
- return -ENODEV;
- }
- probed++;
-
- switch (pdev->device) {
- case PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA0_TA:
- rc = sbridge_get_all_devices(&num_mc,
- pci_dev_descr_ibridge_table);
- type = IVY_BRIDGE;
- break;
- case PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_HA0:
- rc = sbridge_get_all_devices(&num_mc,
- pci_dev_descr_sbridge_table);
- type = SANDY_BRIDGE;
- break;
- case PCI_DEVICE_ID_INTEL_HASWELL_IMC_HA0:
- rc = sbridge_get_all_devices(&num_mc,
- pci_dev_descr_haswell_table);
- type = HASWELL;
- break;
- case PCI_DEVICE_ID_INTEL_BROADWELL_IMC_HA0:
- rc = sbridge_get_all_devices(&num_mc,
- pci_dev_descr_broadwell_table);
- type = BROADWELL;
- break;
- case PCI_DEVICE_ID_INTEL_KNL_IMC_SAD0:
- rc = sbridge_get_all_devices_knl(&num_mc,
- pci_dev_descr_knl_table);
- type = KNIGHTS_LANDING;
- break;
- }
if (unlikely(rc < 0)) {
- edac_dbg(0, "couldn't get all devices for 0x%x\n", pdev->device);
+ edac_dbg(0, "couldn't get all devices\n");
goto fail0;
}
@@ -3410,14 +3376,13 @@
mc, mc + 1, num_mc);
sbridge_dev->mc = mc++;
- rc = sbridge_register_mci(sbridge_dev, type);
+ rc = sbridge_register_mci(sbridge_dev, id - sbridge_cpuids);
if (unlikely(rc < 0))
goto fail1;
}
sbridge_printk(KERN_INFO, "%s\n", SBRIDGE_REVISION);
- mutex_unlock(&sbridge_edac_lock);
return 0;
fail1:
@@ -3426,74 +3391,47 @@
sbridge_put_all_devices();
fail0:
- mutex_unlock(&sbridge_edac_lock);
return rc;
}
/*
- * sbridge_remove destructor for one instance of device
+ * sbridge_remove cleanup
*
*/
-static void sbridge_remove(struct pci_dev *pdev)
+static void sbridge_remove(void)
{
struct sbridge_dev *sbridge_dev;
edac_dbg(0, "\n");
- /*
- * we have a trouble here: pdev value for removal will be wrong, since
- * it will point to the X58 register used to detect that the machine
- * is a Nehalem or upper design. However, due to the way several PCI
- * devices are grouped together to provide MC functionality, we need
- * to use a different method for releasing the devices
- */
-
- mutex_lock(&sbridge_edac_lock);
-
- if (unlikely(!probed)) {
- mutex_unlock(&sbridge_edac_lock);
- return;
- }
-
list_for_each_entry(sbridge_dev, &sbridge_edac_list, list)
sbridge_unregister_mci(sbridge_dev);
/* Release PCI resources */
sbridge_put_all_devices();
-
- probed--;
-
- mutex_unlock(&sbridge_edac_lock);
}
-MODULE_DEVICE_TABLE(pci, sbridge_pci_tbl);
-
-/*
- * sbridge_driver pci_driver structure for this module
- *
- */
-static struct pci_driver sbridge_driver = {
- .name = "sbridge_edac",
- .probe = sbridge_probe,
- .remove = sbridge_remove,
- .id_table = sbridge_pci_tbl,
-};
-
/*
* sbridge_init Module entry function
* Try to initialize this module for its devices
*/
static int __init sbridge_init(void)
{
- int pci_rc;
+ const struct x86_cpu_id *id;
+ int rc;
edac_dbg(2, "\n");
+ id = x86_match_cpu(sbridge_cpuids);
+ if (!id)
+ return -ENODEV;
+
/* Ensure that the OPSTATE is set correctly for POLL or NMI */
opstate_init();
- pci_rc = pci_register_driver(&sbridge_driver);
- if (pci_rc >= 0) {
+ rc = sbridge_probe(id);
+
+ if (rc >= 0) {
mce_register_decode_chain(&sbridge_mce_dec);
if (get_edac_report_status() == EDAC_REPORTING_DISABLED)
sbridge_printk(KERN_WARNING, "Loading driver, error reporting disabled.\n");
@@ -3501,9 +3439,9 @@
}
sbridge_printk(KERN_ERR, "Failed to register device with error %d.\n",
- pci_rc);
+ rc);
- return pci_rc;
+ return rc;
}
/*
@@ -3513,7 +3451,7 @@
static void __exit sbridge_exit(void)
{
edac_dbg(2, "\n");
- pci_unregister_driver(&sbridge_driver);
+ sbridge_remove();
mce_unregister_decode_chain(&sbridge_mce_dec);
}