x86: apic - unify setup_local_APIC

[firefly-linux-kernel-4.4.55.git] / arch / x86 / kernel / apic_64.c

diff --git a/arch/x86/kernel/apic_64.c b/arch/x86/kernel/apic_64.c
index 4587e16f73ecf7c677e8e4aea8bec8f89e9ff3e3..283968d4e0240e9c9b1ef48fd0caf010985f9773 100644 (file)
--- a/arch/x86/kernel/apic_64.c
+++ b/arch/x86/kernel/apic_64.c
@@ -76,6 +76,8 @@ char system_vectors[NR_VECTORS] = { [0 ... NR_VECTORS-1] = SYS_VECTOR_FREE};
  */
 unsigned int apic_verbosity;
 
+int pic_mode;
+
 /* Have we found an MP table */
 int smp_found_config;
 
@@ -943,8 +945,17 @@ void __cpuinit setup_local_APIC(void)
        unsigned int value;
        int i, j;
 
+#ifdef CONFIG_X86_32
+       /* Pound the ESR really hard over the head with a big hammer - mbligh */
+       if (esr_disable) {
+               apic_write(APIC_ESR, 0);
+               apic_write(APIC_ESR, 0);
+               apic_write(APIC_ESR, 0);
+               apic_write(APIC_ESR, 0);
+       }
+#endif
+
        preempt_disable();
-       value = apic_read(APIC_LVR);
 
        /*
         * Double-check whether this APIC is really registered.
@@ -997,7 +1008,34 @@ void __cpuinit setup_local_APIC(void)
         */
        value |= APIC_SPIV_APIC_ENABLED;
 
-       /* We always use processor focus */
+#ifdef CONFIG_X86_32
+       /*
+        * Some unknown Intel IO/APIC (or APIC) errata is biting us with
+        * certain networking cards. If high frequency interrupts are
+        * happening on a particular IOAPIC pin, plus the IOAPIC routing
+        * entry is masked/unmasked at a high rate as well then sooner or
+        * later IOAPIC line gets 'stuck', no more interrupts are received
+        * from the device. If focus CPU is disabled then the hang goes
+        * away, oh well :-(
+        *
+        * [ This bug can be reproduced easily with a level-triggered
+        *   PCI Ne2000 networking cards and PII/PIII processors, dual
+        *   BX chipset. ]
+        */
+       /*
+        * Actually disabling the focus CPU check just makes the hang less
+        * frequent as it makes the interrupt distributon model be more
+        * like LRU than MRU (the short-term load is more even across CPUs).
+        * See also the comment in end_level_ioapic_irq().  --macro
+        */
+
+       /*
+        * - enable focus processor (bit==0)
+        * - 64bit mode always use processor focus
+        *   so no need to set it
+        */
+       value &= ~APIC_SPIV_FOCUS_DISABLED;
+#endif
 
        /*
         * Set spurious IRQ vector
@@ -1016,14 +1054,14 @@ void __cpuinit setup_local_APIC(void)
         * TODO: set up through-local-APIC from through-I/O-APIC? --macro
         */
        value = apic_read(APIC_LVT0) & APIC_LVT_MASKED;
-       if (!smp_processor_id() && !value) {
+       if (!smp_processor_id() && (pic_mode || !value)) {
                value = APIC_DM_EXTINT;
                apic_printk(APIC_VERBOSE, "enabled ExtINT on CPU#%d\n",
-                           smp_processor_id());
+                               smp_processor_id());
        } else {
                value = APIC_DM_EXTINT | APIC_LVT_MASKED;
                apic_printk(APIC_VERBOSE, "masked ExtINT on CPU#%d\n",
-                           smp_processor_id());
+                               smp_processor_id());
        }
        apic_write(APIC_LVT0, value);
 
@@ -1034,7 +1072,10 @@ void __cpuinit setup_local_APIC(void)
                value = APIC_DM_NMI;
        else
                value = APIC_DM_NMI | APIC_LVT_MASKED;
+       if (!lapic_is_integrated())             /* 82489DX */
+               value |= APIC_LVT_LEVEL_TRIGGER;
        apic_write(APIC_LVT1, value);
+
        preempt_enable();
 }