ACPI, x86: expose some IO-APIC routines when CONFIG_ACPI=n

Some IO-APIC routines are ACPI specific now, but need to
be exposed when CONFIG_ACPI=n for the benefit of SFI.

Remove #ifdef ACPI around these routines:

io_apic_get_unique_id(int ioapic, int apic_id);
io_apic_get_version(int ioapic);
io_apic_get_redir_entries(int ioapic);

Move these routines from ACPI-specific boot.c to io_apic.c:

uniq_ioapic_id(u8 id)
mp_find_ioapic()
mp_find_ioapic_pin()
mp_register_ioapic()

Also, since uniq_ioapic_id() is now no longer static,
re-name it to io_apic_unique_id() for consistency
with the other public io_apic routines.

For simplicity, do not #ifdef the resulting code ACPI || SFI,
thought that could be done in the future if it is important
to optimize the !ACPI !SFI IO-APIC x86 kernel for size.

Signed-off-by: Feng Tang <feng.tang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Cc: x86@kernel.org

1 files changed, 97 insertions, 6 deletions

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index d2ed6c5ddc80..a8c0232b3893 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -85,6 +85,9 @@ int nr_ioapic_registers[MAX_IO_APICS];
 struct mpc_ioapic mp_ioapics[MAX_IO_APICS];
 int nr_ioapics;
 
+/* IO APIC gsi routing info */
+struct mp_ioapic_gsi  mp_gsi_routing[MAX_IO_APICS];
+
 /* MP IRQ source entries */
 struct mpc_intsrc mp_irqs[MAX_IRQ_SOURCES];
 
@@ -3941,11 +3944,28 @@ int io_apic_set_pci_routing(struct device *dev, int irq,
         return __io_apic_set_pci_routing(dev, irq, irq_attr);
 }
 
-/* --------------------------------------------------------------------------
-                          ACPI-based IOAPIC Configuration
-   -------------------------------------------------------------------------- */
+u8 __init io_apic_unique_id(u8 id)
+{
+#ifdef CONFIG_X86_32
+        if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) &&
+            !APIC_XAPIC(apic_version[boot_cpu_physical_apicid]))
+                return io_apic_get_unique_id(nr_ioapics, id);
+        else
+                return id;
+#else
+        int i;
+        DECLARE_BITMAP(used, 256);
 
-#ifdef CONFIG_ACPI
+        bitmap_zero(used, 256);
+        for (i = 0; i < nr_ioapics; i++) {
+                struct mpc_ioapic *ia = &mp_ioapics[i];
+                __set_bit(ia->apicid, used);
+        }
+        if (!test_bit(id, used))
+                return id;
+        return find_first_zero_bit(used, 256);
+#endif
+}
 
 #ifdef CONFIG_X86_32
 int __init io_apic_get_unique_id(int ioapic, int apic_id)
@@ -4054,8 +4074,6 @@ int acpi_get_override_irq(int bus_irq, int *trigger, int *polarity)
         return 0;
 }
 
-#endif /* CONFIG_ACPI */
-
 /*
  * This function currently is only a helper for the i386 smp boot process where
  * we need to reprogram the ioredtbls to cater for the cpus which have come online
@@ -4201,3 +4219,76 @@ void __init ioapic_insert_resources(void)
                 r++;
         }
 }
+
+int mp_find_ioapic(int gsi)
+{
+        int i = 0;
+
+        /* Find the IOAPIC that manages this GSI. */
+        for (i = 0; i < nr_ioapics; i++) {
+                if ((gsi >= mp_gsi_routing[i].gsi_base)
+                    && (gsi <= mp_gsi_routing[i].gsi_end))
+                        return i;
+        }
+
+        printk(KERN_ERR "ERROR: Unable to locate IOAPIC for GSI %d\n", gsi);
+        return -1;
+}
+
+int mp_find_ioapic_pin(int ioapic, int gsi)
+{
+        if (WARN_ON(ioapic == -1))
+                return -1;
+        if (WARN_ON(gsi > mp_gsi_routing[ioapic].gsi_end))
+                return -1;
+
+        return gsi - mp_gsi_routing[ioapic].gsi_base;
+}
+
+static int bad_ioapic(unsigned long address)
+{
+        if (nr_ioapics >= MAX_IO_APICS) {
+                printk(KERN_WARNING "WARING: Max # of I/O APICs (%d) exceeded "
+                       "(found %d), skipping\n", MAX_IO_APICS, nr_ioapics);
+                return 1;
+        }
+        if (!address) {
+                printk(KERN_WARNING "WARNING: Bogus (zero) I/O APIC address"
+                       " found in table, skipping!\n");
+                return 1;
+        }
+        return 0;
+}
+
+void __init mp_register_ioapic(int id, u32 address, u32 gsi_base)
+{
+        int idx = 0;
+
+        if (bad_ioapic(address))
+                return;
+
+        idx = nr_ioapics;
+
+        mp_ioapics[idx].type = MP_IOAPIC;
+        mp_ioapics[idx].flags = MPC_APIC_USABLE;
+        mp_ioapics[idx].apicaddr = address;
+
+        set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address);
+        mp_ioapics[idx].apicid = io_apic_unique_id(id);
+        mp_ioapics[idx].apicver = io_apic_get_version(idx);
+
+        /*
+         * Build basic GSI lookup table to facilitate gsi->io_apic lookups
+         * and to prevent reprogramming of IOAPIC pins (PCI GSIs).
+         */
+        mp_gsi_routing[idx].gsi_base = gsi_base;
+        mp_gsi_routing[idx].gsi_end = gsi_base +
+            io_apic_get_redir_entries(idx);
+
+        printk(KERN_INFO "IOAPIC[%d]: apic_id %d, version %d, address 0x%x, "
+               "GSI %d-%d\n", idx, mp_ioapics[idx].apicid,
+               mp_ioapics[idx].apicver, mp_ioapics[idx].apicaddr,
+               mp_gsi_routing[idx].gsi_base, mp_gsi_routing[idx].gsi_end);
+
+        nr_ioapics++;
+}