1*1e12ee3bSFrançois Tigeot /* 2*1e12ee3bSFrançois Tigeot * Copyright © 2014 Intel Corporation 3*1e12ee3bSFrançois Tigeot * 4*1e12ee3bSFrançois Tigeot * Permission is hereby granted, free of charge, to any person obtaining a 5*1e12ee3bSFrançois Tigeot * copy of this software and associated documentation files (the "Software"), 6*1e12ee3bSFrançois Tigeot * to deal in the Software without restriction, including without limitation 7*1e12ee3bSFrançois Tigeot * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8*1e12ee3bSFrançois Tigeot * and/or sell copies of the Software, and to permit persons to whom the 9*1e12ee3bSFrançois Tigeot * Software is furnished to do so, subject to the following conditions: 10*1e12ee3bSFrançois Tigeot * 11*1e12ee3bSFrançois Tigeot * The above copyright notice and this permission notice (including the next 12*1e12ee3bSFrançois Tigeot * paragraph) shall be included in all copies or substantial portions of the 13*1e12ee3bSFrançois Tigeot * Software. 14*1e12ee3bSFrançois Tigeot * 15*1e12ee3bSFrançois Tigeot * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16*1e12ee3bSFrançois Tigeot * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17*1e12ee3bSFrançois Tigeot * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18*1e12ee3bSFrançois Tigeot * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19*1e12ee3bSFrançois Tigeot * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 20*1e12ee3bSFrançois Tigeot * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 21*1e12ee3bSFrançois Tigeot * IN THE SOFTWARE. 22*1e12ee3bSFrançois Tigeot * 23*1e12ee3bSFrançois Tigeot */ 24*1e12ee3bSFrançois Tigeot 25*1e12ee3bSFrançois Tigeot #include <linux/mm.h> 26*1e12ee3bSFrançois Tigeot #include <linux/io-mapping.h> 27*1e12ee3bSFrançois Tigeot 28*1e12ee3bSFrançois Tigeot #include <asm/pgtable.h> 29*1e12ee3bSFrançois Tigeot 30*1e12ee3bSFrançois Tigeot #include "i915_drv.h" 31*1e12ee3bSFrançois Tigeot 32*1e12ee3bSFrançois Tigeot struct remap_pfn { 33*1e12ee3bSFrançois Tigeot struct mm_struct *mm; 34*1e12ee3bSFrançois Tigeot unsigned long pfn; 35*1e12ee3bSFrançois Tigeot pgprot_t prot; 36*1e12ee3bSFrançois Tigeot }; 37*1e12ee3bSFrançois Tigeot 38*1e12ee3bSFrançois Tigeot #if 0 39*1e12ee3bSFrançois Tigeot static int remap_pfn(pte_t *pte, pgtable_t token, 40*1e12ee3bSFrançois Tigeot unsigned long addr, void *data) 41*1e12ee3bSFrançois Tigeot { 42*1e12ee3bSFrançois Tigeot struct remap_pfn *r = data; 43*1e12ee3bSFrançois Tigeot 44*1e12ee3bSFrançois Tigeot /* Special PTE are not associated with any struct page */ 45*1e12ee3bSFrançois Tigeot set_pte_at(r->mm, addr, pte, pte_mkspecial(pfn_pte(r->pfn, r->prot))); 46*1e12ee3bSFrançois Tigeot r->pfn++; 47*1e12ee3bSFrançois Tigeot 48*1e12ee3bSFrançois Tigeot return 0; 49*1e12ee3bSFrançois Tigeot } 50*1e12ee3bSFrançois Tigeot 51*1e12ee3bSFrançois Tigeot /** 52*1e12ee3bSFrançois Tigeot * remap_io_mapping - remap an IO mapping to userspace 53*1e12ee3bSFrançois Tigeot * @vma: user vma to map to 54*1e12ee3bSFrançois Tigeot * @addr: target user address to start at 55*1e12ee3bSFrançois Tigeot * @pfn: physical address of kernel memory 56*1e12ee3bSFrançois Tigeot * @size: size of map area 57*1e12ee3bSFrançois Tigeot * @iomap: the source io_mapping 58*1e12ee3bSFrançois Tigeot * 59*1e12ee3bSFrançois Tigeot * Note: this is only safe if the mm semaphore is held when called. 60*1e12ee3bSFrançois Tigeot */ 61*1e12ee3bSFrançois Tigeot int remap_io_mapping(struct vm_area_struct *vma, 62*1e12ee3bSFrançois Tigeot unsigned long addr, unsigned long pfn, unsigned long size, 63*1e12ee3bSFrançois Tigeot struct io_mapping *iomap) 64*1e12ee3bSFrançois Tigeot { 65*1e12ee3bSFrançois Tigeot struct remap_pfn r; 66*1e12ee3bSFrançois Tigeot int err; 67*1e12ee3bSFrançois Tigeot 68*1e12ee3bSFrançois Tigeot GEM_BUG_ON((vma->vm_flags & 69*1e12ee3bSFrançois Tigeot (VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP)) != 70*1e12ee3bSFrançois Tigeot (VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP)); 71*1e12ee3bSFrançois Tigeot 72*1e12ee3bSFrançois Tigeot /* We rely on prevalidation of the io-mapping to skip track_pfn(). */ 73*1e12ee3bSFrançois Tigeot r.mm = vma->vm_mm; 74*1e12ee3bSFrançois Tigeot r.pfn = pfn; 75*1e12ee3bSFrançois Tigeot r.prot = __pgprot((pgprot_val(iomap->prot) & _PAGE_CACHE_MASK) | 76*1e12ee3bSFrançois Tigeot (pgprot_val(vma->vm_page_prot) & ~_PAGE_CACHE_MASK)); 77*1e12ee3bSFrançois Tigeot 78*1e12ee3bSFrançois Tigeot err = apply_to_page_range(r.mm, addr, size, remap_pfn, &r); 79*1e12ee3bSFrançois Tigeot if (unlikely(err)) { 80*1e12ee3bSFrançois Tigeot zap_vma_ptes(vma, addr, (r.pfn - pfn) << PAGE_SHIFT); 81*1e12ee3bSFrançois Tigeot return err; 82*1e12ee3bSFrançois Tigeot } 83*1e12ee3bSFrançois Tigeot 84*1e12ee3bSFrançois Tigeot return 0; 85*1e12ee3bSFrançois Tigeot } 86*1e12ee3bSFrançois Tigeot #endif 87