s390/pci: do not require AIS facility

[ Upstream commit 48070c73058be6de9c0d754d441ed7092dfc8f12 ]

As of today QEMU does not provide the AIS facility to its guest.  This
prevents Linux guests from using PCI devices as the ais facility is
checked during init. As this is just a performance optimization, we can
move the ais check into the code where we need it (calling the SIC
instruction). This is used at initialization and on interrupt. Both
places do not require any serialization, so we can simply skip the
instruction.

Since we will now get all interrupts, we can also avoid the 2nd scan.
As we can have multiple interrupts in parallel we might trigger spurious
irqs more often for the non-AIS case but the core code can handle that.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Pierre Morel <pmorel@linux.vnet.ibm.com>
Reviewed-by: Halil Pasic <pasic@linux.vnet.ibm.com>
Acked-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/s390/include/asm/pci_insn.h b/arch/s390/include/asm/pci_insn.h
index 649eb62..9e02cb7 100644 (file)
--- a/arch/s390/include/asm/pci_insn.h
+++ b/arch/s390/include/asm/pci_insn.h
@@ -81,6 +81,6 @@ int zpci_refresh_trans(u64 fn, u64 addr, u64 range);
 int zpci_load(u64 *data, u64 req, u64 offset);
 int zpci_store(u64 data, u64 req, u64 offset);
 int zpci_store_block(const u64 *data, u64 req, u64 offset);
-void zpci_set_irq_ctrl(u16 ctl, char *unused, u8 isc);
+int zpci_set_irq_ctrl(u16 ctl, char *unused, u8 isc);
 
 #endif

diff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c
index f2f6720..ef0499b 100644 (file)
--- a/arch/s390/pci/pci.c
+++ b/arch/s390/pci/pci.c
@@ -359,7 +359,8 @@ static void zpci_irq_handler(struct airq_struct *airq)
                                /* End of second scan with interrupts on. */
                                break;
                        /* First scan complete, reenable interrupts. */
-                       zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC);
+                       if (zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC))
+                               break;
                        si = 0;
                        continue;
                }
@@ -921,7 +922,7 @@ static int __init pci_base_init(void)
        if (!s390_pci_probe)
                return 0;
 
-       if (!test_facility(69) || !test_facility(71) || !test_facility(72))
+       if (!test_facility(69) || !test_facility(71))
                return 0;
 
        rc = zpci_debug_init();

diff --git a/arch/s390/pci/pci_insn.c b/arch/s390/pci/pci_insn.c
index 10ca15d..bc06539 100644 (file)
--- a/arch/s390/pci/pci_insn.c
+++ b/arch/s390/pci/pci_insn.c
@@ -7,6 +7,7 @@
 #include <linux/export.h>
 #include <linux/errno.h>
 #include <linux/delay.h>
+#include <asm/facility.h>
 #include <asm/pci_insn.h>
 #include <asm/pci_debug.h>
 #include <asm/processor.h>
@@ -91,11 +92,14 @@ int zpci_refresh_trans(u64 fn, u64 addr, u64 range)
 }
 
 /* Set Interruption Controls */
-void zpci_set_irq_ctrl(u16 ctl, char *unused, u8 isc)
+int zpci_set_irq_ctrl(u16 ctl, char *unused, u8 isc)
 {
+       if (!test_facility(72))
+               return -EIO;
        asm volatile (
                "       .insn   rsy,0xeb00000000d1,%[ctl],%[isc],%[u]\n"
                : : [ctl] "d" (ctl), [isc] "d" (isc << 27), [u] "Q" (*unused));
+       return 0;
 }
 
 /* PCI Load */