diff --git a/arch/powerpc/platforms/powernv/vas-window.c b/arch/powerpc/platforms/powernv/vas-window.c index 4b5adf5218825ff035611c0c195a132a32bbd556..d0c07cf03f68054eeaec80c490202bb6ba176c37 100644 --- a/arch/powerpc/platforms/powernv/vas-window.c +++ b/arch/powerpc/platforms/powernv/vas-window.c @@ -1181,6 +1181,7 @@ static void poll_window_credits(struct vas_window *window) { u64 val; int creds, mode; + int count = 0; val = read_hvwc_reg(window, VREG(WINCTL)); if (window->tx_win) @@ -1199,10 +1200,27 @@ static void poll_window_credits(struct vas_window *window) creds = GET_FIELD(VAS_LRX_WCRED, val); } + /* + * Takes around few milliseconds to complete all pending requests + * and return credits. + * TODO: Scan fault FIFO and invalidate CRBs points to this window + * and issue CRB Kill to stop all pending requests. Need only + * if there is a bug in NX or fault handling in kernel. + */ if (creds < window->wcreds_max) { val = 0; set_current_state(TASK_UNINTERRUPTIBLE); schedule_timeout(msecs_to_jiffies(10)); + count++; + /* + * Process can not close send window until all credits are + * returned. + */ + if (!(count % 1000)) + pr_warn_ratelimited("VAS: pid %d stuck. Waiting for credits returned for Window(%d). creds %d, Retries %d\n", + vas_window_pid(window), window->winid, + creds, count); + goto retry; } } @@ -1216,6 +1234,7 @@ static void poll_window_busy_state(struct vas_window *window) { int busy; u64 val; + int count = 0; retry: val = read_hvwc_reg(window, VREG(WIN_STATUS)); @@ -1223,7 +1242,16 @@ static void poll_window_busy_state(struct vas_window *window) if (busy) { val = 0; set_current_state(TASK_UNINTERRUPTIBLE); - schedule_timeout(msecs_to_jiffies(5)); + schedule_timeout(msecs_to_jiffies(10)); + count++; + /* + * Takes around few milliseconds to process all pending + * requests. + */ + if (!(count % 1000)) + pr_warn_ratelimited("VAS: pid %d stuck. Window (ID=%d) is in busy state. Retries %d\n", + vas_window_pid(window), window->winid, count); + goto retry; } }