Revert "pci: interrupt disable bit support"

This reverts commit 0ea5709a32085f7d14901a09d12bd35f9b267607.

Per discussion with Michael Tsirkin, this is too risky for 0.12

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
(cherry picked from commit d587e0787153f0224a6140c5015609963ceaabfb)

2 files changed, 2 insertions, 28 deletions

diff --git a/hw/pci.c b/hw/pci.c
index 404eead58c..086da4f834 100644
--- a/hw/pci.c
+++ b/hw/pci.c
@@ -518,8 +518,7 @@ static void pci_init_wmask(PCIDevice *dev)
     dev->wmask[PCI_CACHE_LINE_SIZE] = 0xff;
     dev->wmask[PCI_INTERRUPT_LINE] = 0xff;
     pci_set_word(dev->wmask + PCI_COMMAND,
-                 PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
-                 PCI_COMMAND_INTX_DISABLE);
+                 PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
 
     memset(dev->wmask + PCI_CONFIG_HEADER_SIZE, 0xff,
            config_size - PCI_CONFIG_HEADER_SIZE);
@@ -944,25 +943,6 @@ static void pci_update_mappings(PCIDevice *d)
     }
 }
 
-static inline int pci_irq_disabled(PCIDevice *d)
-{
-    return pci_get_word(d->config + PCI_COMMAND) & PCI_COMMAND_INTX_DISABLE;
-}
-
-/* Called after interrupt disabled field update in config space,
- * assert/deassert interrupts if necessary.
- * Gets original interrupt disable bit value (before update). */
-static void pci_update_irq_disabled(PCIDevice *d, int was_irq_disabled)
-{
-    int i, disabled = pci_irq_disabled(d);
-    if (disabled == was_irq_disabled)
-        return;
-    for (i = 0; i < PCI_NUM_PINS; ++i) {
-        int state = pci_irq_state(d, i);
-        pci_change_irq_level(d, i, disabled ? -state : state);
-    }
-}
-
 uint32_t pci_default_read_config(PCIDevice *d,
                                  uint32_t address, int len)
 {
@@ -975,7 +955,7 @@ uint32_t pci_default_read_config(PCIDevice *d,
 
 void pci_default_write_config(PCIDevice *d, uint32_t addr, uint32_t val, int l)
 {
-    int i, was_irq_disabled = pci_irq_disabled(d);
+    int i;
     uint32_t config_size = pci_config_size(d);
 
     for (i = 0; i < l && addr + i < config_size; val >>= 8, ++i) {
@@ -987,9 +967,6 @@ void pci_default_write_config(PCIDevice *d, uint32_t addr, uint32_t val, int l)
         ranges_overlap(addr, l, PCI_ROM_ADDRESS1, 4) ||
         range_covers_byte(addr, l, PCI_COMMAND))
         pci_update_mappings(d);
-
-    if (range_covers_byte(addr, l, PCI_COMMAND))
-        pci_update_irq_disabled(d, was_irq_disabled);
 }
 
 /***********************************************************/
@@ -1007,8 +984,6 @@ static void pci_set_irq(void *opaque, int irq_num, int level)
 
     pci_set_irq_state(pci_dev, irq_num, level);
     pci_update_irq_status(pci_dev);
-    if (pci_irq_disabled(pci_dev))
-        return;
     pci_change_irq_level(pci_dev, irq_num, change);
 }
 
diff --git a/hw/pci.h b/hw/pci.h
index d279e3f7f8..dc9b8604fe 100644
--- a/hw/pci.h
+++ b/hw/pci.h
@@ -101,7 +101,6 @@ typedef struct PCIIORegion {
 #define  PCI_COMMAND_IO		0x1	/* Enable response in I/O space */
 #define  PCI_COMMAND_MEMORY	0x2	/* Enable response in Memory space */
 #define  PCI_COMMAND_MASTER	0x4	/* Enable bus master */
-#define  PCI_COMMAND_INTX_DISABLE 0x400 /* INTx Emulation Disable */
 #define PCI_STATUS              0x06    /* 16 bits */
 #define  PCI_STATUS_INTERRUPT   0x08
 #define PCI_REVISION_ID         0x08    /* 8 bits  */