From 55761b2fe706f8f68ca3a8827b950fd01af1650b Mon Sep 17 00:00:00 2001 From: Dave Airlie Date: Thu, 31 Jul 2008 13:12:36 +1000 Subject: drm: add fault handler support so as to be more like possible upstream (cherry picked from commit 10d5b037b85706037df89bf0275436797e4eb559) --- linux-core/drm_compat.c | 99 +++++++++++++++++++++++++++++++++++++++++++++++++ linux-core/drm_compat.h | 3 ++ linux-core/drm_vm.c | 35 ++++++++--------- 3 files changed, 120 insertions(+), 17 deletions(-) (limited to 'linux-core') diff --git a/linux-core/drm_compat.c b/linux-core/drm_compat.c index aa825f32..d06b9d24 100644 --- a/linux-core/drm_compat.c +++ b/linux-core/drm_compat.c @@ -806,3 +806,102 @@ void *kmap_atomic_prot_pfn(unsigned long pfn, enum km_type type, EXPORT_SYMBOL(kmap_atomic_prot_pfn); #endif +#ifdef DRM_FULL_MM_COMPAT +#ifdef DRM_NO_FAULT +unsigned long drm_bo_vm_nopfn(struct vm_area_struct *vma, + unsigned long address) +{ + struct drm_buffer_object *bo = (struct drm_buffer_object *) vma->vm_private_data; + unsigned long page_offset; + struct page *page = NULL; + struct drm_ttm *ttm; + struct drm_device *dev; + unsigned long pfn; + int err; + unsigned long bus_base; + unsigned long bus_offset; + unsigned long bus_size; + unsigned long ret = NOPFN_REFAULT; + + if (address > vma->vm_end) + return NOPFN_SIGBUS; + + dev = bo->dev; + err = drm_bo_read_lock(&dev->bm.bm_lock, 1); + if (err) + return NOPFN_REFAULT; + + err = mutex_lock_interruptible(&bo->mutex); + if (err) { + drm_bo_read_unlock(&dev->bm.bm_lock); + return NOPFN_REFAULT; + } + + err = drm_bo_wait(bo, 0, 1, 0, 1); + if (err) { + ret = (err != -EAGAIN) ? NOPFN_SIGBUS : NOPFN_REFAULT; + bo->priv_flags &= ~_DRM_BO_FLAG_UNLOCKED; + goto out_unlock; + } + + bo->priv_flags &= ~_DRM_BO_FLAG_UNLOCKED; + + /* + * If buffer happens to be in a non-mappable location, + * move it to a mappable. + */ + + if (!(bo->mem.flags & DRM_BO_FLAG_MAPPABLE)) { + uint32_t new_flags = bo->mem.proposed_flags | + DRM_BO_FLAG_MAPPABLE | + DRM_BO_FLAG_FORCE_MAPPABLE; + err = drm_bo_move_buffer(bo, new_flags, 0, 0); + if (err) { + ret = (err != -EAGAIN) ? NOPFN_SIGBUS : NOPFN_REFAULT; + goto out_unlock; + } + } + + err = drm_bo_pci_offset(dev, &bo->mem, &bus_base, &bus_offset, + &bus_size); + + if (err) { + ret = NOPFN_SIGBUS; + goto out_unlock; + } + + page_offset = (address - vma->vm_start) >> PAGE_SHIFT; + + if (bus_size) { + struct drm_mem_type_manager *man = &dev->bm.man[bo->mem.mem_type]; + + pfn = ((bus_base + bus_offset) >> PAGE_SHIFT) + page_offset; + vma->vm_page_prot = drm_io_prot(man->drm_bus_maptype, vma); + } else { + ttm = bo->ttm; + + drm_ttm_fixup_caching(ttm); + page = drm_ttm_get_page(ttm, page_offset); + if (!page) { + ret = NOPFN_OOM; + goto out_unlock; + } + pfn = page_to_pfn(page); + vma->vm_page_prot = (bo->mem.flags & DRM_BO_FLAG_CACHED) ? + vm_get_page_prot(vma->vm_flags) : + drm_io_prot(_DRM_TTM, vma); + } + + err = vm_insert_pfn(vma, address, pfn); + if (err) { + ret = (err != -EAGAIN) ? NOPFN_OOM : NOPFN_REFAULT; + goto out_unlock; + } +out_unlock: + BUG_ON(bo->priv_flags & _DRM_BO_FLAG_UNLOCKED); + mutex_unlock(&bo->mutex); + drm_bo_read_unlock(&dev->bm.bm_lock); + return ret; +} +#endif +#endif diff --git a/linux-core/drm_compat.h b/linux-core/drm_compat.h index cfa4fc6d..19dc1f67 100644 --- a/linux-core/drm_compat.h +++ b/linux-core/drm_compat.h @@ -319,6 +319,9 @@ extern int drm_bo_map_bound(struct vm_area_struct *vma); /* fixme when functions are upstreamed - upstreamed for 2.6.23 */ #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)) #define DRM_IDR_COMPAT_FN +#define DRM_NO_FAULT +extern unsigned long drm_bo_vm_nopfn(struct vm_area_struct *vma, + unsigned long address); #endif #ifdef DRM_IDR_COMPAT_FN int idr_for_each(struct idr *idp, diff --git a/linux-core/drm_vm.c b/linux-core/drm_vm.c index 6618c0ae..0d5242d3 100644 --- a/linux-core/drm_vm.c +++ b/linux-core/drm_vm.c @@ -685,8 +685,8 @@ EXPORT_SYMBOL(drm_mmap); * \c Pagefault method for buffer objects. * * \param vma Virtual memory area. - * \param address File offset. - * \return Error or refault. The pfn is manually inserted. + * \param vmf vm fault data + * \return Error or VM_FAULT_NOPAGE:. The pfn is manually inserted. * * It's important that pfns are inserted while holding the bo->mutex lock. * otherwise we might race with unmap_mapping_range() which is always @@ -699,8 +699,8 @@ EXPORT_SYMBOL(drm_mmap); */ #ifdef DRM_FULL_MM_COMPAT -static unsigned long drm_bo_vm_nopfn(struct vm_area_struct *vma, - unsigned long address) +static int drm_bo_vm_fault(struct vm_area_struct *vma, + struct vm_fault *vmf) { struct drm_buffer_object *bo = (struct drm_buffer_object *) vma->vm_private_data; unsigned long page_offset; @@ -712,25 +712,22 @@ static unsigned long drm_bo_vm_nopfn(struct vm_area_struct *vma, unsigned long bus_base; unsigned long bus_offset; unsigned long bus_size; - unsigned long ret = NOPFN_REFAULT; - - if (address > vma->vm_end) - return NOPFN_SIGBUS; + unsigned long ret = VM_FAULT_NOPAGE; dev = bo->dev; err = drm_bo_read_lock(&dev->bm.bm_lock, 1); if (err) - return NOPFN_REFAULT; + return VM_FAULT_NOPAGE; err = mutex_lock_interruptible(&bo->mutex); if (err) { drm_bo_read_unlock(&dev->bm.bm_lock); - return NOPFN_REFAULT; + return VM_FAULT_NOPAGE; } err = drm_bo_wait(bo, 0, 1, 0, 1); if (err) { - ret = (err != -EAGAIN) ? NOPFN_SIGBUS : NOPFN_REFAULT; + ret = (err != -EAGAIN) ? VM_FAULT_SIGBUS : VM_FAULT_NOPAGE; bo->priv_flags &= ~_DRM_BO_FLAG_UNLOCKED; goto out_unlock; } @@ -748,7 +745,7 @@ static unsigned long drm_bo_vm_nopfn(struct vm_area_struct *vma, DRM_BO_FLAG_FORCE_MAPPABLE; err = drm_bo_move_buffer(bo, new_flags, 0, 0); if (err) { - ret = (err != -EAGAIN) ? NOPFN_SIGBUS : NOPFN_REFAULT; + ret = (err != -EAGAIN) ? VM_FAULT_SIGBUS : VM_FAULT_NOPAGE; goto out_unlock; } } @@ -757,11 +754,11 @@ static unsigned long drm_bo_vm_nopfn(struct vm_area_struct *vma, &bus_size); if (err) { - ret = NOPFN_SIGBUS; + ret = VM_FAULT_SIGBUS; goto out_unlock; } - page_offset = (address - vma->vm_start) >> PAGE_SHIFT; + page_offset = ((unsigned long)vmf->virtual_address - vma->vm_start) >> PAGE_SHIFT; if (bus_size) { struct drm_mem_type_manager *man = &dev->bm.man[bo->mem.mem_type]; @@ -774,7 +771,7 @@ static unsigned long drm_bo_vm_nopfn(struct vm_area_struct *vma, drm_ttm_fixup_caching(ttm); page = drm_ttm_get_page(ttm, page_offset); if (!page) { - ret = NOPFN_OOM; + ret = VM_FAULT_OOM; goto out_unlock; } pfn = page_to_pfn(page); @@ -783,9 +780,9 @@ static unsigned long drm_bo_vm_nopfn(struct vm_area_struct *vma, drm_io_prot(_DRM_TTM, vma); } - err = vm_insert_pfn(vma, address, pfn); + err = vm_insert_pfn(vma, (unsigned long)vmf->virtual_address, pfn); if (err) { - ret = (err != -EAGAIN) ? NOPFN_OOM : NOPFN_REFAULT; + ret = (err != -EAGAIN) ? VM_FAULT_OOM : VM_FAULT_NOPAGE; goto out_unlock; } out_unlock: @@ -849,7 +846,11 @@ static void drm_bo_vm_close(struct vm_area_struct *vma) static struct vm_operations_struct drm_bo_vm_ops = { #ifdef DRM_FULL_MM_COMPAT +#ifdef DRM_NO_FAULT .nopfn = drm_bo_vm_nopfn, +#else + .fault = drm_bo_vm_fault, +#endif #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,19)) .nopfn = drm_bo_vm_nopfn, -- cgit v1.2.3