Replace legacy MMIO error injection with full PAPR-compliant RTAS error
injection supporting 14+ error types via
- ibm,open-errinjct
- ibm,errinjct
- ibm,close-errinjct.
Key features:
- Complete open-session-inject-close cycle management
- Special handling for ibm,open-errinjct output format (token,status)
- Comprehensive buffer preparation per PAPR layouts
- All pr_* logging uses pr_fmt("EEH: ") prefix
Tested with corresponding QEMU patches:
https://lore.kernel.org/all/[email protected]/
Signed-off-by: Narayana Murty N <[email protected]>
---
arch/powerpc/platforms/pseries/eeh_pseries.c | 168 ++++++++++++++++---
1 file changed, 147 insertions(+), 21 deletions(-)
diff --git a/arch/powerpc/platforms/pseries/eeh_pseries.c
b/arch/powerpc/platforms/pseries/eeh_pseries.c
index d6f2e0d43b89..6af2a153ec25 100644
--- a/arch/powerpc/platforms/pseries/eeh_pseries.c
+++ b/arch/powerpc/platforms/pseries/eeh_pseries.c
@@ -902,8 +902,7 @@ static int validate_special_event(unsigned long
addr, unsigned long mask)
* Return: 0 if valid, RTAS_INVALID_PARAMETER otherwise.
*/
-static int validate_corrupted_page(struct eeh_pe *pe __maybe_unused,
- unsigned long addr, unsigned long mask)
+static int validate_corrupted_page(unsigned long addr, unsigned long
mask)
{
if (!addr) {
pr_err("corrupted-page requires non-zero addr\n");
@@ -978,7 +977,7 @@ static int prepare_errinjct_buffer(struct eeh_pe
*pe, int type, int func,
if (addr == 0)
return RTAS_INVALID_PARAMETER;
- if (validate_corrupted_page(pe, addr, mask))
+ if (validate_corrupted_page(addr, mask))
return RTAS_INVALID_PARAMETER;
buf32[0] = cpu_to_be32(upper_32_bits(addr));
@@ -1047,6 +1046,97 @@ static int prepare_errinjct_buffer(struct
eeh_pe *pe, int type, int func,
return 0;
}
+/**
+ * rtas_open_errinjct_session - Open an RTAS error injection session
+ *
+ * Opens a session with the RTAS ibm,open-errinjct service.
+ *
+ * Return: Positive session token on success, negative error code on
failure.
+ */
+static int rtas_open_errinjct_session(void)
+{
+ int open_token, args[2] = {0};
+ int rc, status, session_token = -1;
+
+ open_token = rtas_function_token(RTAS_FN_IBM_OPEN_ERRINJCT);
+ if (open_token == RTAS_UNKNOWN_SERVICE) {
+ pr_err("RTAS: ibm,open-errinjct not available\n");
+ return RTAS_UNKNOWN_SERVICE;
+ }
+
+ /* Call open; original code treated rtas_call return as session
token */
+ rc = rtas_call(open_token, 0, 2, args);
+ status = args[1];
+ if (status != 0) {
+ pr_err("RTAS: open-errinjct failed: status=%d args[1]=%d
rc=%d\n",
+ status, args[1], rc);
+ return status ? status : -EIO;
+ }
+
+ session_token = args[0];
+ pr_info("Opened injection session: token=%d\n", session_token);
+ return session_token;
+}
+
+/**
+ * rtas_close_errinjct_session - Close an RTAS error injection session
+ * @session_token: Session token returned from open
+ *
+ * Attempts to close a previously opened error injection session.
Best-effort;
+ * logs warnings if close fails or if service is unavailable.
+ */
+
+static void rtas_close_errinjct_session(int session_token)
+{
+ int close_token, args[2] = {0};
+
+ if (session_token <= 0)
+ return;
+
+ close_token = rtas_function_token(RTAS_FN_IBM_CLOSE_ERRINJCT);
+ if (close_token == RTAS_UNKNOWN_SERVICE) {
+ pr_warn("close-errinjct not available\n");
+ return;
+ }
+
+ args[0] = session_token;
+ rtas_call(close_token, 1, 1, args);
+ if (args[0])
+ pr_warn("close-errinjct args[0]=%d\n", args[0]);
+}
+
+/**
+ * do_errinjct_call - Invoke the RTAS error injection service
+ * @errinjct_token: RTAS token for ibm,errinjct
+ * @type: RTAS error type
+ * @session_token: RTAS error injection session token
+ *
+ * Issues the RTAS ibm,errinjct call with the prepared work buffer.
Logs errors
+ * on failure.
+ *
+ * Return: 0 on success, negative error code otherwise.
+ */
+
+static int do_errinjct_call(int errinjct_token, int type, int
session_token)
+{
+ int rc, status;
+
+ if (errinjct_token == RTAS_UNKNOWN_SERVICE)
+ return -ENODEV;
+
+ /* errinjct takes: type, session_token, workbuf pointer (3 in),
returns status */
+ rc = rtas_call(errinjct_token, 3, 1, &status, type, session_token,
+ rtas_errinjct_buf);
