arch/tile: support multiple huge page sizes dynamically

This change adds support for a new "super" bit in the PTE, using the new
arch_make_huge_pte() method.  The Tilera hypervisor sees the bit set at a
given level of the page table and gangs together 4, 16, or 64 consecutive
pages from that level of the hierarchy to create a larger TLB entry.

One extra "super" page size can be specified at each of the three levels
of the page table hierarchy on tilegx, using the "hugepagesz" argument
on the boot command line.  A new hypervisor API is added to allow Linux
to tell the hypervisor how many PTEs to gang together at each level of
the page table.

To allow pre-allocating huge pages larger than the buddy allocator can
handle, this change modifies the Tilera bootmem support to put all of
memory on tilegx platforms into bootmem.

As part of this change I eliminate the vestigial CONFIG_HIGHPTE support,
which never worked anyway, and eliminate the hv_page_size() API in favor
of the standard vma_kernel_pagesize() API.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>

1 files changed, 6 insertions, 5 deletions

diff --git a/arch/tile/kernel/tlb.c b/arch/tile/kernel/tlb.c
index a5f241c24cac..3fd54d5bbd4c 100644
--- a/arch/tile/kernel/tlb.c
+++ b/arch/tile/kernel/tlb.c
@@ -15,6 +15,7 @@
 
 #include <linux/cpumask.h>
 #include <linux/module.h>
+#include <linux/hugetlb.h>
 #include <asm/tlbflush.h>
 #include <asm/homecache.h>
 #include <hv/hypervisor.h>
@@ -49,25 +50,25 @@ void flush_tlb_current_task(void)
 	flush_tlb_mm(current->mm);
 }
 
-void flush_tlb_page_mm(const struct vm_area_struct *vma, struct mm_struct *mm,
+void flush_tlb_page_mm(struct vm_area_struct *vma, struct mm_struct *mm,
 		       unsigned long va)
 {
-	unsigned long size = hv_page_size(vma);
+	unsigned long size = vma_kernel_pagesize(vma);
 	int cache = (vma->vm_flags & VM_EXEC) ? HV_FLUSH_EVICT_L1I : 0;
 	flush_remote(0, cache, mm_cpumask(mm),
 		     va, size, size, mm_cpumask(mm), NULL, 0);
 }
 
-void flush_tlb_page(const struct vm_area_struct *vma, unsigned long va)
+void flush_tlb_page(struct vm_area_struct *vma, unsigned long va)
 {
 	flush_tlb_page_mm(vma, vma->vm_mm, va);
 }
 EXPORT_SYMBOL(flush_tlb_page);
 
-void flush_tlb_range(const struct vm_area_struct *vma,
+void flush_tlb_range(struct vm_area_struct *vma,
 		     unsigned long start, unsigned long end)
 {
-	unsigned long size = hv_page_size(vma);
+	unsigned long size = vma_kernel_pagesize(vma);
 	struct mm_struct *mm = vma->vm_mm;
 	int cache = (vma->vm_flags & VM_EXEC) ? HV_FLUSH_EVICT_L1I : 0;
 	flush_remote(0, cache, mm_cpumask(mm), start, end - start, size,