qdio: support forced signal adapter indications
frank.blaschka@de.ibm.com [Mon, 8 Aug 2011 01:33:56 +0000 (01:33 +0000)]
This patch ensures that signal adapter commands are issued if they are
indicated to be required.

Signed-off-by: Einar Lueck <elelueck@de.ibm.com>
Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/s390/include/asm/qdio.h
drivers/s390/cio/qdio.h
drivers/s390/cio/qdio_main.c

index 3881e94..2199362 100644 (file)
@@ -279,6 +279,16 @@ struct qdio_outbuf_state {
 
 #define CHSC_AC1_INITIATE_INPUTQ       0x80
 
+
+/* qdio adapter-characteristics-1 flag */
+#define AC1_SIGA_INPUT_NEEDED          0x40    /* process input queues */
+#define AC1_SIGA_OUTPUT_NEEDED         0x20    /* process output queues */
+#define AC1_SIGA_SYNC_NEEDED           0x10    /* ask hypervisor to sync */
+#define AC1_AUTOMATIC_SYNC_ON_THININT  0x08    /* set by hypervisor */
+#define AC1_AUTOMATIC_SYNC_ON_OUT_PCI  0x04    /* set by hypervisor */
+#define AC1_SC_QEBSM_AVAILABLE         0x02    /* available for subchannel */
+#define AC1_SC_QEBSM_ENABLED           0x01    /* enabled for subchannel */
+
 #define CHSC_AC2_DATA_DIV_AVAILABLE    0x0010
 #define CHSC_AC2_DATA_DIV_ENABLED      0x0002
 
index 2b21f65..3dd8644 100644 (file)
@@ -87,15 +87,6 @@ enum qdio_irq_states {
 #define CHSC_FLAG_QDIO_CAPABILITY      0x80
 #define CHSC_FLAG_VALIDITY             0x40
 
-/* qdio adapter-characteristics-1 flag */
-#define AC1_SIGA_INPUT_NEEDED          0x40    /* process input queues */
-#define AC1_SIGA_OUTPUT_NEEDED         0x20    /* process output queues */
-#define AC1_SIGA_SYNC_NEEDED           0x10    /* ask hypervisor to sync */
-#define AC1_AUTOMATIC_SYNC_ON_THININT  0x08    /* set by hypervisor */
-#define AC1_AUTOMATIC_SYNC_ON_OUT_PCI  0x04    /* set by hypervisor */
-#define AC1_SC_QEBSM_AVAILABLE         0x02    /* available for subchannel */
-#define AC1_SC_QEBSM_ENABLED           0x01    /* enabled for subchannel */
-
 /* SIGA flags */
 #define QDIO_SIGA_WRITE                0x00
 #define QDIO_SIGA_READ         0x01
index a7153f2..9a12228 100644 (file)
@@ -1592,12 +1592,9 @@ set:
        used = atomic_add_return(count, &q->nr_buf_used) - count;
        BUG_ON(used + count > QDIO_MAX_BUFFERS_PER_Q);
 
-       /* no need to signal as long as the adapter had free buffers */
-       if (used)
-               return 0;
-
        if (need_siga_in(q))
                return qdio_siga_input(q);
+
        return 0;
 }