x86: read apic ID in the !acpi_lapic case

Ed found that on 32-bit, boot_cpu_physical_apicid is not read right,
when the mptable is broken.

Interestingly, actually three paths use/set it:

 1. acpi: at that time that is already read from reg
 2. mptable: only read from mptable
 3. no madt, and no mptable, that use default apic id 0 for 64-bit, -1 for 32-bit

so we could read the apic id for the 2/3 path. We trust the hardware
register more than we trust a BIOS data structure (the mptable).

We can also avoid the double set_fixmap() when acpi_lapic
is used, and also need to move cpu_has_apic earlier and
call apic_disable().

Also when need to update the apic id, we'd better read and
set the apic version as well - so that quirks are applied precisely.

v2: make path 3 with 64bit, use -1 as apic id, so could read it later.
v3: fix whitespace problem pointed out by Ed Swierk
v5: fix boot crash

[ Impact: get correct apic id for bsp other than acpi path ]

Reported-by: Ed Swierk <eswierk@aristanetworks.com>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Acked-by: Cyrill Gorcunov <gorcunov@openvz.org>
LKML-Reference: <49FC85A9.2070702@kernel.org>
[ v4: sanity-check in the ACPI case too ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>

2 files changed, 27 insertions, 24 deletions

diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 07cffc1214cb..b0fd26442c41 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -242,17 +242,24 @@ static int modern_apic(void)
  * bare function to substitute write operation
  * and it's _that_ fast :)
  */
-void native_apic_write_dummy(u32 reg, u32 v)
+static void native_apic_write_dummy(u32 reg, u32 v)
 {
         WARN_ON_ONCE((cpu_has_apic || !disable_apic));
 }
 
+static u32 native_apic_read_dummy(u32 reg)
+{
+        WARN_ON_ONCE((cpu_has_apic || !disable_apic));
+        return 0;
+}
+
 /*
- * right after this call apic->write doesn't do anything
+ * right after this call apic->write/read doesn't do anything
  * note that there is no restore operation it works one way
  */
 void apic_disable(void)
 {
+        apic->read = native_apic_read_dummy;
         apic->write = native_apic_write_dummy;
 }
 
@@ -1576,32 +1583,23 @@ void __init init_apic_mappings(void)
                 return;
         }
 
-        /*
-         * If no local APIC can be found then set up a fake all
-         * zeroes page to simulate the local APIC and another
-         * one for the IO-APIC.
-         */
+        /* If no local APIC can be found return early */
         if (!smp_found_config && detect_init_APIC()) {
-                apic_phys = (unsigned long) alloc_bootmem_pages(PAGE_SIZE);
-                apic_phys = __pa(apic_phys);
-        } else
+                /* lets NOP'ify apic operations */
+                pr_info("APIC: disable apic facility\n");
+                apic_disable();
+        } else {
                 apic_phys = mp_lapic_addr;
 
-        /*
-         * acpi lapic path already maps that address in
-         * acpi_register_lapic_address()
-         */
-        if (!acpi_lapic)
-                set_fixmap_nocache(FIX_APIC_BASE, apic_phys);
-
-        apic_printk(APIC_VERBOSE, "mapped APIC to %08lx (%08lx)\n",
-                        APIC_BASE, apic_phys);
+                /*
+                 * acpi lapic path already maps that address in
+                 * acpi_register_lapic_address()
+                 */
+                if (!acpi_lapic)
+                        set_fixmap_nocache(FIX_APIC_BASE, apic_phys);
 
-        /* lets check if we may NOP'ify apic operations */
-        if (!cpu_has_apic) {
-                pr_info("APIC: disable apic facility\n");
-                apic_disable();
-                return;
+                apic_printk(APIC_VERBOSE, "mapped APIC to %08lx (%08lx)\n",
+                                        APIC_BASE, apic_phys);
         }
 
         /*
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 1f3d3669dae8..74d2b480a20b 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -1878,6 +1878,11 @@ __apicdebuginit(void) print_PIC(void)
 __apicdebuginit(int) print_all_ICs(void)
 {
         print_PIC();
+
+        /* don't print out if apic is not there */
+        if (!cpu_has_apic || disable_apic)
+                return 0;
+
         print_all_local_APICs();
         print_IO_APIC();