From d5d14ed6f2db7287a5088e1350cf422bf72140b3 Mon Sep 17 00:00:00 2001 From: Chris Metcalf Date: Thu, 29 Mar 2012 13:58:43 -0400 Subject: arch/tile: Allow tilegx to build with either 16K or 64K page size This change introduces new flags for the hv_install_context() API that passes a page table pointer to the hypervisor. Clients can explicitly request 4K, 16K, or 64K small pages when they install a new context. In practice, the page size is fixed at kernel compile time and the same size is always requested every time a new page table is installed. The header changes so that it provides more abstract macros for managing "page" things like PFNs and page tables. For example there is now a HV_DEFAULT_PAGE_SIZE_SMALL instead of the old HV_PAGE_SIZE_SMALL. The various PFN routines have been eliminated and only PA- or PTFN-based ones remain (since PTFNs are always expressed in fixed 2KB "page" size). The page-table management macros are renamed with a leading underscore and take page-size arguments with the presumption that clients will use those macros in some single place to provide the "real" macros they will use themselves. I happened to notice the old hv_set_caching() API was totally broken (it assumed 4KB pages) so I changed it so it would nominally work correctly with other page sizes. Tag modules with the page size so you can't load a module built with a conflicting page size. (And add a test for SMP while we're at it.) Signed-off-by: Chris Metcalf --- arch/tile/kernel/setup.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) (limited to 'arch/tile/kernel/setup.c') diff --git a/arch/tile/kernel/setup.c b/arch/tile/kernel/setup.c index bff23f476110..32948e21113a 100644 --- a/arch/tile/kernel/setup.c +++ b/arch/tile/kernel/setup.c @@ -1396,13 +1396,13 @@ void __init setup_per_cpu_areas(void) for (i = 0; i < size; i += PAGE_SIZE, ++pfn, ++pg) { /* Update the vmalloc mapping and page home. */ - pte_t *ptep = - virt_to_pte(NULL, (unsigned long)ptr + i); + unsigned long addr = (unsigned long)ptr + i; + pte_t *ptep = virt_to_pte(NULL, addr); pte_t pte = *ptep; BUG_ON(pfn != pte_pfn(pte)); pte = hv_pte_set_mode(pte, HV_PTE_MODE_CACHE_TILE_L3); pte = set_remote_cache_cpu(pte, cpu); - set_pte(ptep, pte); + set_pte_at(&init_mm, addr, ptep, pte); /* Update the lowmem mapping for consistency. */ lowmem_va = (unsigned long)pfn_to_kaddr(pfn); @@ -1415,7 +1415,7 @@ void __init setup_per_cpu_areas(void) BUG_ON(pte_huge(*ptep)); } BUG_ON(pfn != pte_pfn(*ptep)); - set_pte(ptep, pte); + set_pte_at(&init_mm, lowmem_va, ptep, pte); } } -- cgit v1.2.3