[PATCH] EDAC/versal: Report PFN and page offset for DDR errors

Shubhrajyoti Datta
2026-04-15T06:02:54Z

Currently, DDRMC correctable and uncorrectable error events are reported
to EDAC with page frame number (pfn) and offset set to zero.
This information is not useful to locate the address for memory errors.

Compute the physical address from the error information and extract
the page frame number and offset before calling edac_mc_handle_error().
This provides the actual memory location information to the userspace.

Fixes: 6f15b178cd63 ("EDAC/versal: Add a Xilinx Versal memory controller driver")
Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@amd.com>
---

drivers/edac/versal_edac.c | 36 +++++++++++++++++-------------------
1 file changed, 17 insertions(+), 19 deletions(-)

diff --git a/drivers/edac/versal_edac.c b/drivers/edac/versal_edac.c
index 5a43b5d43ca2..18045f96610e 100644
--- a/drivers/edac/versal_edac.c
+++ b/drivers/edac/versal_edac.c
@@ -414,34 +414,32 @@ static unsigned long convert_to_physical(struct edac_priv *priv, union ecc_error
static void handle_error(struct mem_ctl_info *mci, struct ecc_status *stat)
{
struct edac_priv *priv = mci->pvt_info;
+ enum hw_event_mc_err_type type;
union ecc_error_info pinf;
+ unsigned long pa, pfn;

if (stat->error_type == XDDR_ERR_TYPE_CE) {
priv->ce_cnt++;
pinf = stat->ceinfo[stat->channel];
- snprintf(priv->message, XDDR_EDAC_MSG_SIZE,
- "Error type:%s MC ID: %d Addr at %lx Burst Pos: %d\n",
- "CE", priv->mc_id,
- convert_to_physical(priv, pinf), pinf.burstpos);
-
- edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci,
- 1, 0, 0, 0, 0, 0, -1,
- priv->message, "");
- }
-
- if (stat->error_type == XDDR_ERR_TYPE_UE) {
+ type = HW_EVENT_ERR_CORRECTED;
+ } else if (stat->error_type == XDDR_ERR_TYPE_UE) {
priv->ue_cnt++;
pinf = stat->ueinfo[stat->channel];
- snprintf(priv->message, XDDR_EDAC_MSG_SIZE,
- "Error type:%s MC ID: %d Addr at %lx Burst Pos: %d\n",
- "UE", priv->mc_id,
- convert_to_physical(priv, pinf), pinf.burstpos);
-
- edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci,
- 1, 0, 0, 0, 0, 0, -1,
- priv->message, "");
+ type = HW_EVENT_ERR_UNCORRECTED;
+ } else {
+ return;
}

+ pa = convert_to_physical(priv, pinf);
+ pfn = PHYS_PFN(pa);
+ snprintf(priv->message, XDDR_EDAC_MSG_SIZE,
+ "Error type:%s MC ID: %d Addr at %lx Burst Pos: %d\n",
+ type == HW_EVENT_ERR_UNCORRECTED ? "UE" : "CE", priv->mc_id,
+ pa, pinf.burstpos);
+ edac_mc_handle_error(type, mci,
+ 1, pfn, offset_in_page(pa), 0, 0, 0, -1,
+ priv->message, "");
+
memset(stat, 0, sizeof(*stat));
}

--
2.34.1