From: Thor Thayer <tthayer@xxxxxxxxxxxxxxxxxxxxx>
In preparation for additional memory module ECCs, the
IRQ function will check a panic flag before doing a
kernel panic on double bit errors.
OCRAM uncorrectable errors cause a panic because sleep/resume
functions and FPGA contents during sleep are stored in OCRAM.
ECCs on peripheral FIFO buffers will not cause a kernel panic
on DBERRs because the packet can be retried and therefore
recovered.
Signed-off-by: Thor Thayer <tthayer@xxxxxxxxxxxxxxxxxxxxx>
---
v2 New patch. Add panic flag to IRQ function.
v3 No change
v4 Add reasons to panic on DBERR in OCRAM.
---
drivers/edac/altera_edac.c | 9 ++++++++-
drivers/edac/altera_edac.h | 1 +
2 files changed, 9 insertions(+), 1 deletion(-)
diff --git a/drivers/edac/altera_edac.c b/drivers/edac/altera_edac.c
index 926bcaf..ced7c55 100644
--- a/drivers/edac/altera_edac.c
+++ b/drivers/edac/altera_edac.c
@@ -897,7 +897,8 @@ static irqreturn_t altr_edac_a10_ecc_irq(int irq, void *dev_id)
writel(ALTR_A10_ECC_DERRPENA,
base + ALTR_A10_ECC_INTSTAT_OFST);
edac_device_handle_ue(dci->edac_dev, 0, 0, dci->edac_dev_name);
- panic("\nEDAC:ECC_DEVICE[Uncorrectable errors]\n");
+ if (dci->data->panic)
+ panic("\nEDAC:ECC_DEVICE[Uncorrectable errors]\n");
return IRQ_HANDLED;
}
@@ -936,6 +937,12 @@ const struct edac_device_prv_data a10_ocramecc_data = {
.set_err_ofst = ALTR_A10_ECC_INTTEST_OFST,
.ecc_irq_handler = altr_edac_a10_ecc_irq,
.inject_fops = &altr_edac_a10_device_inject_fops,
+ /*
+ * OCRAM panic on uncorrectable error because sleep/resume
+ * functions and FPGA contents are stored in OCRAM. Prefer
+ * a kernel panic over executing/loading corrupted data.
+ */
+ .panic = true,
};
#endif /* CONFIG_EDAC_ALTERA_OCRAM */
diff --git a/drivers/edac/altera_edac.h b/drivers/edac/altera_edac.h
index 62b0fa0..cf4e8cb 100644
--- a/drivers/edac/altera_edac.h
+++ b/drivers/edac/altera_edac.h
@@ -298,6 +298,7 @@ struct edac_device_prv_data {
irqreturn_t (*ecc_irq_handler)(int irq, void *dev_id);
int trig_alloc_sz;
const struct file_operations *inject_fops;
+ bool panic;
};
struct altr_edac_device_dev {
--
1.7.9.5
--
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