459 lines
10 KiB
C
459 lines
10 KiB
C
/**************************************************************************
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*
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* This kernel module is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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**************************************************************************/
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/*
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* This code provides access to unexported mm kernel features. It is necessary
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* to use the new DRM memory manager code with kernels that don't support it
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* directly.
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*
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* Authors: Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
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* Linux kernel mm subsystem authors.
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* (Most code taken from there).
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*/
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#include "drmP.h"
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#if defined(CONFIG_X86) && (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,15))
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/*
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* These have bad performance in the AGP module for the indicated kernel versions.
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*/
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int drm_map_page_into_agp(struct page *page)
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{
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int i;
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i = change_page_attr(page, 1, PAGE_KERNEL_NOCACHE);
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/* Caller's responsibility to call global_flush_tlb() for
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* performance reasons */
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return i;
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}
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int drm_unmap_page_from_agp(struct page *page)
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{
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int i;
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i = change_page_attr(page, 1, PAGE_KERNEL);
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/* Caller's responsibility to call global_flush_tlb() for
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* performance reasons */
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return i;
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}
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#endif
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#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19))
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/*
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* The protection map was exported in 2.6.19
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*/
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pgprot_t vm_get_page_prot(unsigned long vm_flags)
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{
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#ifdef MODULE
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static pgprot_t drm_protection_map[16] = {
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__P000, __P001, __P010, __P011, __P100, __P101, __P110, __P111,
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__S000, __S001, __S010, __S011, __S100, __S101, __S110, __S111
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};
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return drm_protection_map[vm_flags & 0x0F];
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#else
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extern pgprot_t protection_map[];
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return protection_map[vm_flags & 0x0F];
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#endif
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};
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#endif
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#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,15))
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/*
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* vm code for kernels below 2.6.15 in which version a major vm write
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* occured. This implement a simple straightforward
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* version similar to what's going to be
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* in kernel 2.6.19+
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* Kernels below 2.6.15 use nopage whereas 2.6.19 and upwards use
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* nopfn.
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*/
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static struct {
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spinlock_t lock;
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struct page *dummy_page;
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atomic_t present;
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} drm_np_retry =
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{SPIN_LOCK_UNLOCKED, NOPAGE_OOM, ATOMIC_INIT(0)};
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struct page * get_nopage_retry(void)
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{
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if (atomic_read(&drm_np_retry.present) == 0) {
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struct page *page = alloc_page(GFP_KERNEL);
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if (!page)
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return NOPAGE_OOM;
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spin_lock(&drm_np_retry.lock);
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drm_np_retry.dummy_page = page;
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atomic_set(&drm_np_retry.present,1);
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spin_unlock(&drm_np_retry.lock);
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}
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get_page(drm_np_retry.dummy_page);
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return drm_np_retry.dummy_page;
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}
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void free_nopage_retry(void)
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{
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if (atomic_read(&drm_np_retry.present) == 1) {
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spin_lock(&drm_np_retry.lock);
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__free_page(drm_np_retry.dummy_page);
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drm_np_retry.dummy_page = NULL;
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atomic_set(&drm_np_retry.present, 0);
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spin_unlock(&drm_np_retry.lock);
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}
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}
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struct page *drm_bo_vm_nopage(struct vm_area_struct *vma,
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unsigned long address,
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int *type)
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{
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struct fault_data data;
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if (type)
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*type = VM_FAULT_MINOR;
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data.address = address;
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data.vma = vma;
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drm_bo_vm_fault(vma, &data);
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switch (data.type) {
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case VM_FAULT_OOM:
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return NOPAGE_OOM;
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case VM_FAULT_SIGBUS:
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return NOPAGE_SIGBUS;
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default:
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break;
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}
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return NOPAGE_REFAULT;
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}
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#endif
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#if !defined(DRM_FULL_MM_COMPAT) && \
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((LINUX_VERSION_CODE < KERNEL_VERSION(2,6,15)) || \
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(LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,19)))
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static int drm_pte_is_clear(struct vm_area_struct *vma,
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unsigned long addr)
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{
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struct mm_struct *mm = vma->vm_mm;
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int ret = 1;
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pte_t *pte;
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pmd_t *pmd;
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pud_t *pud;
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pgd_t *pgd;
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spin_lock(&mm->page_table_lock);
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pgd = pgd_offset(mm, addr);
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if (pgd_none(*pgd))
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goto unlock;
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pud = pud_offset(pgd, addr);
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if (pud_none(*pud))
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goto unlock;
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pmd = pmd_offset(pud, addr);
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if (pmd_none(*pmd))
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goto unlock;
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pte = pte_offset_map(pmd, addr);
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if (!pte)
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goto unlock;
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ret = pte_none(*pte);
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pte_unmap(pte);
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unlock:
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spin_unlock(&mm->page_table_lock);
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return ret;
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}
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int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr,
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unsigned long pfn)
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{
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int ret;
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if (!drm_pte_is_clear(vma, addr))
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return -EBUSY;
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ret = io_remap_pfn_range(vma, addr, pfn, PAGE_SIZE, vma->vm_page_prot);
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return ret;
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}
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#endif
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#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,19) && !defined(DRM_FULL_MM_COMPAT))
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/**
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* While waiting for the fault() handler to appear in
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* we accomplish approximately
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* the same wrapping it with nopfn.
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*/
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unsigned long drm_bo_vm_nopfn(struct vm_area_struct * vma,
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unsigned long address)
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{
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struct fault_data data;
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data.address = address;
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(void) drm_bo_vm_fault(vma, &data);
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if (data.type == VM_FAULT_OOM)
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return NOPFN_OOM;
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else if (data.type == VM_FAULT_SIGBUS)
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return NOPFN_SIGBUS;
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/*
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* pfn already set.
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*/
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return 0;
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}
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#endif
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#ifdef DRM_ODD_MM_COMPAT
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/*
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* VM compatibility code for 2.6.15-2.6.18. This code implements a complicated
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* workaround for a single BUG statement in do_no_page in these versions. The
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* tricky thing is that we need to take the mmap_sem in exclusive mode for _all_
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* vmas mapping the ttm, before dev->struct_mutex is taken. The way we do this is to
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* check first take the dev->struct_mutex, and then trylock all mmap_sems. If this
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* fails for a single mmap_sem, we have to release all sems and the dev->struct_mutex,
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* release the cpu and retry. We also need to keep track of all vmas mapping the ttm.
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* phew.
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*/
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typedef struct p_mm_entry {
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struct list_head head;
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struct mm_struct *mm;
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atomic_t refcount;
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int locked;
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} p_mm_entry_t;
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typedef struct vma_entry {
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struct list_head head;
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struct vm_area_struct *vma;
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} vma_entry_t;
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struct page *drm_bo_vm_nopage(struct vm_area_struct *vma,
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unsigned long address,
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int *type)
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{
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drm_buffer_object_t *bo = (drm_buffer_object_t *) vma->vm_private_data;
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unsigned long page_offset;
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struct page *page;
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drm_ttm_t *ttm;
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drm_device_t *dev;
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mutex_lock(&bo->mutex);
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if (type)
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*type = VM_FAULT_MINOR;
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if (address > vma->vm_end) {
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page = NOPAGE_SIGBUS;
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goto out_unlock;
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}
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dev = bo->dev;
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if (drm_mem_reg_is_pci(dev, &bo->mem)) {
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DRM_ERROR("Invalid compat nopage.\n");
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page = NOPAGE_SIGBUS;
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goto out_unlock;
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}
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ttm = bo->ttm;
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drm_ttm_fixup_caching(ttm);
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page_offset = (address - vma->vm_start) >> PAGE_SHIFT;
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page = drm_ttm_get_page(ttm, page_offset);
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if (!page) {
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page = NOPAGE_OOM;
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goto out_unlock;
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}
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get_page(page);
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out_unlock:
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mutex_unlock(&bo->mutex);
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return page;
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}
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int drm_bo_map_bound(struct vm_area_struct *vma)
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{
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drm_buffer_object_t *bo = (drm_buffer_object_t *)vma->vm_private_data;
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int ret = 0;
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unsigned long bus_base;
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unsigned long bus_offset;
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unsigned long bus_size;
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ret = drm_bo_pci_offset(bo->dev, &bo->mem, &bus_base,
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&bus_offset, &bus_size);
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BUG_ON(ret);
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if (bus_size) {
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drm_mem_type_manager_t *man = &bo->dev->bm.man[bo->mem.mem_type];
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unsigned long pfn = (bus_base + bus_offset) >> PAGE_SHIFT;
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pgprot_t pgprot = drm_io_prot(man->drm_bus_maptype, vma);
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ret = io_remap_pfn_range(vma, vma->vm_start, pfn,
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vma->vm_end - vma->vm_start,
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pgprot);
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}
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return ret;
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}
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int drm_bo_add_vma(drm_buffer_object_t * bo, struct vm_area_struct *vma)
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{
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p_mm_entry_t *entry, *n_entry;
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vma_entry_t *v_entry;
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struct mm_struct *mm = vma->vm_mm;
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v_entry = drm_ctl_alloc(sizeof(*v_entry), DRM_MEM_BUFOBJ);
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if (!v_entry) {
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DRM_ERROR("Allocation of vma pointer entry failed\n");
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return -ENOMEM;
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}
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v_entry->vma = vma;
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list_add_tail(&v_entry->head, &bo->vma_list);
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list_for_each_entry(entry, &bo->p_mm_list, head) {
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if (mm == entry->mm) {
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atomic_inc(&entry->refcount);
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return 0;
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} else if ((unsigned long)mm < (unsigned long)entry->mm) ;
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}
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n_entry = drm_ctl_alloc(sizeof(*n_entry), DRM_MEM_BUFOBJ);
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if (!n_entry) {
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DRM_ERROR("Allocation of process mm pointer entry failed\n");
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return -ENOMEM;
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}
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INIT_LIST_HEAD(&n_entry->head);
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n_entry->mm = mm;
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n_entry->locked = 0;
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atomic_set(&n_entry->refcount, 0);
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list_add_tail(&n_entry->head, &entry->head);
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return 0;
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}
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void drm_bo_delete_vma(drm_buffer_object_t * bo, struct vm_area_struct *vma)
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{
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p_mm_entry_t *entry, *n;
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vma_entry_t *v_entry, *v_n;
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int found = 0;
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struct mm_struct *mm = vma->vm_mm;
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list_for_each_entry_safe(v_entry, v_n, &bo->vma_list, head) {
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if (v_entry->vma == vma) {
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found = 1;
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list_del(&v_entry->head);
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drm_ctl_free(v_entry, sizeof(*v_entry), DRM_MEM_BUFOBJ);
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break;
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}
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}
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BUG_ON(!found);
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list_for_each_entry_safe(entry, n, &bo->p_mm_list, head) {
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if (mm == entry->mm) {
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if (atomic_add_negative(-1, &entry->refcount)) {
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list_del(&entry->head);
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BUG_ON(entry->locked);
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drm_ctl_free(entry, sizeof(*entry), DRM_MEM_BUFOBJ);
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}
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return;
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}
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}
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BUG_ON(1);
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}
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int drm_bo_lock_kmm(drm_buffer_object_t * bo)
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{
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p_mm_entry_t *entry;
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int lock_ok = 1;
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list_for_each_entry(entry, &bo->p_mm_list, head) {
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BUG_ON(entry->locked);
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if (!down_write_trylock(&entry->mm->mmap_sem)) {
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lock_ok = 0;
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break;
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}
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entry->locked = 1;
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}
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if (lock_ok)
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return 0;
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list_for_each_entry(entry, &bo->p_mm_list, head) {
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if (!entry->locked)
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break;
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up_write(&entry->mm->mmap_sem);
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entry->locked = 0;
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}
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/*
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* Possible deadlock. Try again. Our callers should handle this
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* and restart.
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*/
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return -EAGAIN;
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}
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void drm_bo_unlock_kmm(drm_buffer_object_t * bo)
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{
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p_mm_entry_t *entry;
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list_for_each_entry(entry, &bo->p_mm_list, head) {
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BUG_ON(!entry->locked);
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up_write(&entry->mm->mmap_sem);
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entry->locked = 0;
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}
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}
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int drm_bo_remap_bound(drm_buffer_object_t *bo)
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{
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vma_entry_t *v_entry;
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int ret = 0;
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if (drm_mem_reg_is_pci(bo->dev, &bo->mem)) {
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list_for_each_entry(v_entry, &bo->vma_list, head) {
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ret = drm_bo_map_bound(v_entry->vma);
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if (ret)
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break;
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}
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}
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return ret;
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}
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void drm_bo_finish_unmap(drm_buffer_object_t *bo)
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{
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vma_entry_t *v_entry;
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list_for_each_entry(v_entry, &bo->vma_list, head) {
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v_entry->vma->vm_flags &= ~VM_PFNMAP;
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}
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}
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#endif
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