[SPARC64]: Move away from virtual page tables, part 1.

We now use the TSB hardware assist features of the UltraSPARC
MMUs.

SMP is currently knowingly broken, we need to find another place
to store the per-cpu base pointers.  We hid them away in the TSB
base register, and that obviously will not work any more :-)

Another known broken case is non-8KB base page size.

Also noticed that flush_tlb_all() is not referenced anywhere, only
the internal __flush_tlb_all() (local cpu only) is used by the
sparc64 port, so we can get rid of flush_tlb_all().

The kernel gets it's own 8KB TSB (swapper_tsb) and each address space
gets it's own private 8K TSB.  Later we can add code to dynamically
increase the size of per-process TSB as the RSS grows.  An 8KB TSB is
good enough for up to about a 4MB RSS, after which the TSB starts to
incur many capacity and conflict misses.

We even accumulate OBP translations into the kernel TSB.

Another area for refinement is large page size support.  We could use
a secondary address space TSB to handle those.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 11 deletions

diff --git a/arch/sparc64/kernel/smp.c b/arch/sparc64/kernel/smp.c
index 1f7ad8a69052..d2d3369e7b5d 100644
--- a/arch/sparc64/kernel/smp.c
+++ b/arch/sparc64/kernel/smp.c
@@ -123,6 +123,7 @@ extern void inherit_locked_prom_mappings(int save_p);
 
 static inline void cpu_setup_percpu_base(unsigned long cpu_id)
 {
+#error IMMU TSB usage must be fixed
         __asm__ __volatile__("mov       %0, %%g5\n\t"
                              "stxa      %0, [%1] %2\n\t"
                              "membar    #Sync"
@@ -662,8 +663,6 @@ void smp_call_function_client(int irq, struct pt_regs *regs)
 extern unsigned long xcall_flush_tlb_mm;
 extern unsigned long xcall_flush_tlb_pending;
 extern unsigned long xcall_flush_tlb_kernel_range;
-extern unsigned long xcall_flush_tlb_all_spitfire;
-extern unsigned long xcall_flush_tlb_all_cheetah;
 extern unsigned long xcall_report_regs;
 extern unsigned long xcall_receive_signal;
 
@@ -794,15 +793,6 @@ void smp_report_regs(void)
         smp_cross_call(&xcall_report_regs, 0, 0, 0);
 }
 
-void smp_flush_tlb_all(void)
-{
-        if (tlb_type == spitfire)
-                smp_cross_call(&xcall_flush_tlb_all_spitfire, 0, 0, 0);
-        else
-                smp_cross_call(&xcall_flush_tlb_all_cheetah, 0, 0, 0);
-        __flush_tlb_all();
-}
-
 /* We know that the window frames of the user have been flushed
  * to the stack before we get here because all callers of us
  * are flush_tlb_*() routines, and these run after flush_cache_*()