Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty-2.6

[pandora-kernel.git] / arch / powerpc / platforms / 85xx / smp.c

diff --git a/arch/powerpc/platforms/85xx/smp.c b/arch/powerpc/platforms/85xx/smp.c
index a6b1065..5c91a99 100644 (file)
--- a/arch/powerpc/platforms/85xx/smp.c
+++ b/arch/powerpc/platforms/85xx/smp.c
@@ -16,6 +16,7 @@
 #include <linux/delay.h>
 #include <linux/of.h>
 #include <linux/kexec.h>
+#include <linux/highmem.h>
 
 #include <asm/machdep.h>
 #include <asm/pgtable.h>
@@ -79,6 +80,7 @@ smp_85xx_kick_cpu(int nr)
        local_irq_save(flags);
 
        out_be32(bptr_vaddr + BOOT_ENTRY_PIR, nr);
+#ifdef CONFIG_PPC32
        out_be32(bptr_vaddr + BOOT_ENTRY_ADDR_LOWER, __pa(__early_start));
 
        if (!ioremappable)
@@ -88,6 +90,12 @@ smp_85xx_kick_cpu(int nr)
        /* Wait a bit for the CPU to ack. */
        while ((__secondary_hold_acknowledge != nr) && (++n < 1000))
                mdelay(1);
+#else
+       out_be64((u64 *)(bptr_vaddr + BOOT_ENTRY_ADDR_UPPER),
+               __pa((u64)*((unsigned long long *) generic_secondary_smp_init)));
+
+       smp_generic_kick_cpu(nr);
+#endif
 
        local_irq_restore(flags);
 
@@ -114,19 +122,15 @@ struct smp_ops_t smp_85xx_ops = {
 };
 
 #ifdef CONFIG_KEXEC
-static int kexec_down_cpus = 0;
+atomic_t kexec_down_cpus = ATOMIC_INIT(0);
 
 void mpc85xx_smp_kexec_cpu_down(int crash_shutdown, int secondary)
 {
-       mpic_teardown_this_cpu(1);
-
-       /* When crashing, this gets called on all CPU's we only
-        * take down the non-boot cpus */
-       if (smp_processor_id() != boot_cpuid)
-       {
-               local_irq_disable();
-               kexec_down_cpus++;
+       local_irq_disable();
 
+       if (secondary) {
+               atomic_inc(&kexec_down_cpus);
+               /* loop forever */
                while (1);
        }
 }
@@ -137,16 +141,65 @@ static void mpc85xx_smp_kexec_down(void *arg)
                ppc_md.kexec_cpu_down(0,1);
 }
 
-static void mpc85xx_smp_machine_kexec(struct kimage *image)
+static void map_and_flush(unsigned long paddr)
 {
-       int timeout = 2000;
+       struct page *page = pfn_to_page(paddr >> PAGE_SHIFT);
+       unsigned long kaddr  = (unsigned long)kmap(page);
+
+       flush_dcache_range(kaddr, kaddr + PAGE_SIZE);
+       kunmap(page);
+}
+
+/**
+ * Before we reset the other cores, we need to flush relevant cache
+ * out to memory so we don't get anything corrupted, some of these flushes
+ * are performed out of an overabundance of caution as interrupts are not
+ * disabled yet and we can switch cores
+ */
+static void mpc85xx_smp_flush_dcache_kexec(struct kimage *image)
+{
+       kimage_entry_t *ptr, entry;
+       unsigned long paddr;
        int i;
 
-       set_cpus_allowed(current, cpumask_of_cpu(boot_cpuid));
+       if (image->type == KEXEC_TYPE_DEFAULT) {
+               /* normal kexec images are stored in temporary pages */
+               for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE);
+                    ptr = (entry & IND_INDIRECTION) ?
+                               phys_to_virt(entry & PAGE_MASK) : ptr + 1) {
+                       if (!(entry & IND_DESTINATION)) {
+                               map_and_flush(entry);
+                       }
+               }
+               /* flush out last IND_DONE page */
+               map_and_flush(entry);
+       } else {
+               /* crash type kexec images are copied to the crash region */
+               for (i = 0; i < image->nr_segments; i++) {
+                       struct kexec_segment *seg = &image->segment[i];
+                       for (paddr = seg->mem; paddr < seg->mem + seg->memsz;
+                            paddr += PAGE_SIZE) {
+                               map_and_flush(paddr);
+                       }
+               }
+       }
+
+       /* also flush the kimage struct to be passed in as well */
+       flush_dcache_range((unsigned long)image,
+                          (unsigned long)image + sizeof(*image));
+}
+
+static void mpc85xx_smp_machine_kexec(struct kimage *image)
+{
+       int timeout = INT_MAX;
+       int i, num_cpus = num_present_cpus();
+
+       mpc85xx_smp_flush_dcache_kexec(image);
 
-       smp_call_function(mpc85xx_smp_kexec_down, NULL, 0);
+       if (image->type == KEXEC_TYPE_DEFAULT)
+               smp_call_function(mpc85xx_smp_kexec_down, NULL, 0);
 
-       while ( (kexec_down_cpus != (num_online_cpus() - 1)) &&
+       while ( (atomic_read(&kexec_down_cpus) != (num_cpus - 1)) &&
                ( timeout > 0 ) )
        {
                timeout--;
@@ -155,7 +208,7 @@ static void mpc85xx_smp_machine_kexec(struct kimage *image)
        if ( !timeout )
                printk(KERN_ERR "Unable to bring down secondary cpu(s)");
 
-       for (i = 0; i < num_present_cpus(); i++)
+       for (i = 0; i < num_cpus; i++)
        {
                if ( i == smp_processor_id() ) continue;
                mpic_reset_core(i);