Merge remote-tracking branch 'remotes/cohuck/tags/s390x-20200703' into staging

s390 update:
- various fixes
- cleanup in the s390x-ccw bios

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# gpg:                 aka "Cornelia Huck <cornelia.huck@de.ibm.com>" [full]
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* remotes/cohuck/tags/s390x-20200703:
  s390x/pci: fix set_ind_atomic
  virtio-ccw: fix virtio_set_ind_atomic
  target/s390x: Fix SQXBR
  pc-bios/s390: Update s390-ccw bios binaries with the latest changes
  pc-bios/s390-ccw: Generate and include dependency files in the Makefile
  pc-bios: s390x: Make u32 ptr check explicit
  pc-bios: s390x: Use ebcdic2ascii table
  pc-bios: s390x: Move panic() into header and add infinite loop
  pc-bios: s390x: Use PSW masks where possible and introduce PSW_MASK_SHORT_ADDR
  pc-bios: s390x: Rename PSW_MASK_ZMODE to PSW_MASK_64
  pc-bios: s390x: Get rid of magic offsets into the lowcore
  pc-bios: s390x: Move sleep and yield to helper.h
  pc-bios: s390x: Consolidate timing functions into time.h
  pc-bios: s390x: cio.c cleanup and compile fix

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

2 files changed, 19 insertions, 15 deletions

diff --git a/hw/s390x/s390-pci-bus.c b/hw/s390x/s390-pci-bus.c
index 142e52a..736965c 100644
--- a/hw/s390x/s390-pci-bus.c
+++ b/hw/s390x/s390-pci-bus.c
@@ -637,22 +637,24 @@ static AddressSpace *s390_pci_dma_iommu(PCIBus *bus, void *opaque, int devfn)
 
 static uint8_t set_ind_atomic(uint64_t ind_loc, uint8_t to_be_set)
 {
-    uint8_t ind_old, ind_new;
+    uint8_t expected, actual;
     hwaddr len = 1;
-    uint8_t *ind_addr;
+    /* avoid  multiple fetches */
+    uint8_t volatile *ind_addr;
 
     ind_addr = cpu_physical_memory_map(ind_loc, &len, true);
     if (!ind_addr) {
         s390_pci_generate_error_event(ERR_EVENT_AIRERR, 0, 0, 0, 0);
         return -1;
     }
+    actual = *ind_addr;
     do {
-        ind_old = *ind_addr;
-        ind_new = ind_old | to_be_set;
-    } while (atomic_cmpxchg(ind_addr, ind_old, ind_new) != ind_old);
-    cpu_physical_memory_unmap(ind_addr, len, 1, len);
+        expected = actual;
+        actual = atomic_cmpxchg(ind_addr, expected, expected | to_be_set);
+    } while (actual != expected);
+    cpu_physical_memory_unmap((void *)ind_addr, len, 1, len);
 
-    return ind_old;
+    return actual;
 }
 
 static void s390_msi_ctrl_write(void *opaque, hwaddr addr, uint64_t data,
diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c
index c1f4bb1..3c988a0 100644
--- a/hw/s390x/virtio-ccw.c
+++ b/hw/s390x/virtio-ccw.c
@@ -786,9 +786,10 @@ static inline VirtioCcwDevice *to_virtio_ccw_dev_fast(DeviceState *d)
 static uint8_t virtio_set_ind_atomic(SubchDev *sch, uint64_t ind_loc,
                                      uint8_t to_be_set)
 {
-    uint8_t ind_old, ind_new;
+    uint8_t expected, actual;
     hwaddr len = 1;
-    uint8_t *ind_addr;
+    /* avoid  multiple fetches */
+    uint8_t volatile *ind_addr;
 
     ind_addr = cpu_physical_memory_map(ind_loc, &len, true);
     if (!ind_addr) {
@@ -796,14 +797,15 @@ static uint8_t virtio_set_ind_atomic(SubchDev *sch, uint64_t ind_loc,
                      __func__, sch->cssid, sch->ssid, sch->schid);
         return -1;
     }
+    actual = *ind_addr;
     do {
-        ind_old = *ind_addr;
-        ind_new = ind_old | to_be_set;
-    } while (atomic_cmpxchg(ind_addr, ind_old, ind_new) != ind_old);
-    trace_virtio_ccw_set_ind(ind_loc, ind_old, ind_new);
-    cpu_physical_memory_unmap(ind_addr, len, 1, len);
+        expected = actual;
+        actual = atomic_cmpxchg(ind_addr, expected, expected | to_be_set);
+    } while (actual != expected);
+    trace_virtio_ccw_set_ind(ind_loc, actual, actual | to_be_set);
+    cpu_physical_memory_unmap((void *)ind_addr, len, 1, len);
 
-    return ind_old;
+    return actual;
 }
 
 static void virtio_ccw_notify(DeviceState *d, uint16_t vector)