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Date: Thu, 28 Aug 2014 13:53:18 -0700
From: Dave Jiang <dave.jiang@...el.com>
To: jdmason@...zu.us
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH 4/6] ntb: use errata flag set via DID to implement workaround
Instead of using a module parameter, we should detect the errata via
PCI DID and then set an appropriate flag. This will be used for additional
errata later on.
Signed-off-by: Dave Jiang <dave.jiang@...el.com>
---
drivers/ntb/ntb_hw.c | 47 ++++++++++++++++++++++++++++++++++++++---------
drivers/ntb/ntb_hw.h | 4 ++++
2 files changed, 42 insertions(+), 9 deletions(-)
diff --git a/drivers/ntb/ntb_hw.c b/drivers/ntb/ntb_hw.c
index d6f4268..471c847 100644
--- a/drivers/ntb/ntb_hw.c
+++ b/drivers/ntb/ntb_hw.c
@@ -64,10 +64,6 @@ MODULE_VERSION(NTB_VER);
MODULE_LICENSE("Dual BSD/GPL");
MODULE_AUTHOR("Intel Corporation");
-static bool xeon_errata_workaround = true;
-module_param(xeon_errata_workaround, bool, 0644);
-MODULE_PARM_DESC(xeon_errata_workaround, "Workaround for the Xeon Errata");
-
enum {
NTB_CONN_TRANSPARENT = 0,
NTB_CONN_B2B,
@@ -144,6 +140,30 @@ static int is_ntb_atom(struct ntb_device *ndev)
return 0;
}
+static void ntb_set_errata_flags(struct ntb_device *ndev)
+{
+ switch (ndev->pdev->device) {
+ /*
+ * this workaround applies to all platform up to IvyBridge
+ * Haswell has splitbar support and use a different workaround
+ */
+ case PCI_DEVICE_ID_INTEL_NTB_SS_JSF:
+ case PCI_DEVICE_ID_INTEL_NTB_SS_SNB:
+ case PCI_DEVICE_ID_INTEL_NTB_SS_IVT:
+ case PCI_DEVICE_ID_INTEL_NTB_SS_HSX:
+ case PCI_DEVICE_ID_INTEL_NTB_PS_JSF:
+ case PCI_DEVICE_ID_INTEL_NTB_PS_SNB:
+ case PCI_DEVICE_ID_INTEL_NTB_PS_IVT:
+ case PCI_DEVICE_ID_INTEL_NTB_PS_HSX:
+ case PCI_DEVICE_ID_INTEL_NTB_B2B_JSF:
+ case PCI_DEVICE_ID_INTEL_NTB_B2B_SNB:
+ case PCI_DEVICE_ID_INTEL_NTB_B2B_IVT:
+ case PCI_DEVICE_ID_INTEL_NTB_B2B_HSX:
+ ndev->wa_flags |= WA_SNB_ERR;
+ break;
+ }
+}
+
/**
* ntb_register_event_callback() - register event callback
* @ndev: pointer to ntb_device instance
@@ -717,7 +737,7 @@ static int ntb_xeon_setup(struct ntb_device *ndev)
* this use the second memory window to access the interrupt and
* scratch pad registers on the remote system.
*/
- if (xeon_errata_workaround) {
+ if (ndev->wa_flags & WA_SNB_ERR) {
if (!ndev->mw[1].bar_sz)
return -EINVAL;
@@ -772,7 +792,7 @@ static int ntb_xeon_setup(struct ntb_device *ndev)
if (ndev->dev_type == NTB_DEV_USD) {
writeq(SNB_MBAR23_DSD_ADDR, ndev->reg_base +
SNB_PBAR2XLAT_OFFSET);
- if (xeon_errata_workaround)
+ if (ndev->wa_flags & WA_SNB_ERR)
writeq(SNB_MBAR01_DSD_ADDR, ndev->reg_base +
SNB_PBAR4XLAT_OFFSET);
else {
@@ -796,7 +816,7 @@ static int ntb_xeon_setup(struct ntb_device *ndev)
} else {
writeq(SNB_MBAR23_USD_ADDR, ndev->reg_base +
SNB_PBAR2XLAT_OFFSET);
- if (xeon_errata_workaround)
+ if (ndev->wa_flags & WA_SNB_ERR)
writeq(SNB_MBAR01_USD_ADDR, ndev->reg_base +
SNB_PBAR4XLAT_OFFSET);
else {
@@ -819,9 +839,9 @@ static int ntb_xeon_setup(struct ntb_device *ndev)
}
break;
case NTB_CONN_RP:
- if (xeon_errata_workaround) {
+ if (ndev->wa_flags & WA_SNB_ERR) {
dev_err(&ndev->pdev->dev,
- "NTB-RP disabled due to hardware errata. To disregard this warning and potentially lock-up the system, add the parameter 'xeon_errata_workaround=0'.\n");
+ "NTB-RP disabled due to hardware errata. To disregard this warning and potentially lock-up the system\n");
return -EINVAL;
}
@@ -848,6 +868,12 @@ static int ntb_xeon_setup(struct ntb_device *ndev)
ndev->limits.max_mw = SNB_MAX_MW;
break;
case NTB_CONN_TRANSPARENT:
+ if (ndev->wa_flags & WA_SNB_ERR) {
+ dev_err(&ndev->pdev->dev,
+ "NTB-TRANSPARENT disabled due to hardware errata. To disregard this warning and potentially lock-up the system\n");
+ return -EINVAL;
+ }
+
/* Scratch pads need to have exclusive access from the primary
* or secondary side. Halve the num spads so that each side can
* have an equal amount.
@@ -1595,6 +1621,9 @@ static int ntb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
return -ENOMEM;
ndev->pdev = pdev;
+
+ ntb_set_errata_flags(ndev);
+
ndev->link_status = NTB_LINK_DOWN;
pci_set_drvdata(pdev, ndev);
ntb_setup_debugfs(ndev);
diff --git a/drivers/ntb/ntb_hw.h b/drivers/ntb/ntb_hw.h
index ddbcbfd..5380ca1 100644
--- a/drivers/ntb/ntb_hw.h
+++ b/drivers/ntb/ntb_hw.h
@@ -109,6 +109,8 @@ struct ntb_db_cb {
struct tasklet_struct irq_work;
};
+#define WA_SNB_ERR 0x00000001
+
struct ntb_device {
struct pci_dev *pdev;
struct msix_entry *msix_entries;
@@ -153,6 +155,8 @@ struct ntb_device {
struct dentry *debugfs_dir;
struct dentry *debugfs_info;
+
+ unsigned int wa_flags;
};
/**
--
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