[Qemu-devel] Re: [PATCH] Fix lost serial TX interrupts. Report receive overruns.

["Justin T. Gibbs" <gibbs@scsiguy.com>]

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Properly formatted patch now attached.

--
Justin

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>From 7a941b3fcd298b60bb14744b8fae422d86298197 Mon Sep 17 00:00:00 2001
From: Justin T. Gibbs <gibbs@FreeBSD.org>
Date: Wed, 10 Feb 2010 14:35:54 -0700
Subject: [PATCH] Fix lost serial TX interrupts. Report receive overruns.

 o Implement receive overrun status.  The FreeBSD uart driver
   relies on this status in it's probe routine to determine the size
   of the FIFO supported.
 o As per the 16550 spec, do not overwrite the RX FIFO on an RX overrun.
 o Do not allow TX or RX FIFO overruns to increment the data valid count
   beyond the size of the FIFO.
 o For reads of the IIR register, only clear the "TX holding register
   emtpy interrupt" if the read reports this interrupt.  This is required
   by the specification and avoids losing TX interrupts when other,
   higher priority interrupts (usually RX) are reported first.

Signed-off-by: Justin T. Gibbs <gibbs@FreeBSD.org>

---
 hw/serial.c |   28 ++++++++++++++++++++--------
 1 files changed, 20 insertions(+), 8 deletions(-)

diff --git a/hw/serial.c b/hw/serial.c
index e7538ac..df67383 100644
--- a/hw/serial.c
+++ b/hw/serial.c
@@ -169,11 +169,19 @@ static int fifo_put(SerialState *s, int fifo, uint8_t chr)
 {
     SerialFIFO *f = (fifo) ? &s->recv_fifo : &s->xmit_fifo;
 
-    f->data[f->head++] = chr;
+    /* Receive overruns do not overwrite FIFO contents. */
+    if (fifo == XMIT_FIFO || f->count < UART_FIFO_LENGTH) {
 
-    if (f->head == UART_FIFO_LENGTH)
-        f->head = 0;
-    f->count++;
+        f->data[f->head++] = chr;
+
+        if (f->head == UART_FIFO_LENGTH)
+            f->head = 0;
+    }
+
+    if (f->count < UART_FIFO_LENGTH)
+        f->count++;
+    else if (fifo == RECV_FIFO)
+        s->lsr |= UART_LSR_OE;
 
     return 1;
 }
@@ -533,8 +541,10 @@ static uint32_t serial_ioport_read(void *opaque, uint32_t addr)
         break;
     case 2:
         ret = s->iir;
+        if (ret & UART_IIR_THRI) {
             s->thr_ipending = 0;
-        serial_update_irq(s);
+            serial_update_irq(s);
+        }
         break;
     case 3:
         ret = s->lcr;
@@ -544,9 +554,9 @@ static uint32_t serial_ioport_read(void *opaque, uint32_t addr)
         break;
     case 5:
         ret = s->lsr;
-        /* Clear break interrupt */
-        if (s->lsr & UART_LSR_BI) {
-            s->lsr &= ~UART_LSR_BI;
+        /* Clear break and overrun interrupts */
+        if (s->lsr & (UART_LSR_BI|UART_LSR_OE)) {
+            s->lsr &= ~(UART_LSR_BI|UART_LSR_OE);
             serial_update_irq(s);
         }
         break;
@@ -629,6 +639,8 @@ static void serial_receive1(void *opaque, const uint8_t *buf, int size)
         /* call the timeout receive callback in 4 char transmit time */
         qemu_mod_timer(s->fifo_timeout_timer, qemu_get_clock (vm_clock) + s->char_transmit_time * 4);
     } else {
+        if (s->lsr & UART_LSR_DR)
+            s->lsr |= UART_LSR_OE;
         s->rbr = buf[0];
         s->lsr |= UART_LSR_DR;
     }
-- 
1.6.6