qdio: support forced signal adapter indications

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>

diff --git a/arch/s390/include/asm/qdio.h b/arch/s390/include/asm/qdio.h
index 3881e9499e17b685239fe48046b79dfef01dad38..21993623da9a576f0d97c0c6784c20512f73adff 100644 (file)
--- a/arch/s390/include/asm/qdio.h
+++ b/arch/s390/include/asm/qdio.h
@@ -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
 

diff --git a/drivers/s390/cio/qdio.h b/drivers/s390/cio/qdio.h
index 2b21f65a8950142825c093c883520edfd33f9477..3dd86441da3d33ef7077a11e677d6ed600d34e73 100644 (file)
--- a/drivers/s390/cio/qdio.h
+++ b/drivers/s390/cio/qdio.h
@@ -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

diff --git a/drivers/s390/cio/qdio_main.c b/drivers/s390/cio/qdio_main.c
index a7153f2f3aff1ad8c6c768584fcb33feb133ec59..9a122280246c1783485af4140d9785cefadca976 100644 (file)
--- a/drivers/s390/cio/qdio_main.c
+++ b/drivers/s390/cio/qdio_main.c
@@ -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;
 }