diff options
Diffstat (limited to 'linux-core/drm_vm.c')
| -rw-r--r-- | linux-core/drm_vm.c | 55 |
1 files changed, 43 insertions, 12 deletions
diff --git a/linux-core/drm_vm.c b/linux-core/drm_vm.c index 17778c26..4a340b57 100644 --- a/linux-core/drm_vm.c +++ b/linux-core/drm_vm.c @@ -720,11 +720,20 @@ EXPORT_SYMBOL(drm_mmap); * \param vma Virtual memory area. * \param data Fault data on failure or refault. * \return Always NULL as we insert pfns directly. + * + * It's important that pfns are inserted while holding the bo->mutex lock. + * otherwise we might race with unmap_mapping_range() which is always + * called with the bo->mutex lock held. + * + * It's not pretty to modify the vma->vm_page_prot variable while not + * holding the mm semaphore in write mode. However, we have it i read mode, + * so we won't be racing with any other writers, and we only actually modify + * it when no ptes are present so it shouldn't be a big deal. */ -#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,21) || \ +#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,19) || \ LINUX_VERSION_CODE < KERNEL_VERSION(2,6,15)) -#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,21)) +#ifdef DRM_FULL_MM_COMPAT static #endif struct page *drm_bo_vm_fault(struct vm_area_struct *vma, @@ -738,7 +747,6 @@ struct page *drm_bo_vm_fault(struct vm_area_struct *vma, drm_device_t *dev; unsigned long pfn; int err; - pgprot_t pgprot; unsigned long bus_base; unsigned long bus_offset; unsigned long bus_size; @@ -759,14 +767,12 @@ struct page *drm_bo_vm_fault(struct vm_area_struct *vma, * move it to a mappable. */ +#ifdef DRM_BO_FULL_COMPAT if (!(bo->mem.flags & DRM_BO_FLAG_MAPPABLE)) { - uint32_t mask_save = bo->mem.mask; uint32_t new_mask = bo->mem.mask | DRM_BO_FLAG_MAPPABLE | DRM_BO_FLAG_FORCE_MAPPABLE; - err = drm_bo_move_buffer(bo, new_mask, 0, 0); - bo->mem.mask = mask_save; if (err) { data->type = (err == -EAGAIN) ? @@ -774,6 +780,24 @@ struct page *drm_bo_vm_fault(struct vm_area_struct *vma, goto out_unlock; } } +#else + if (!(bo->mem.flags & DRM_BO_FLAG_MAPPABLE)) { + unsigned long _end = jiffies + 3*DRM_HZ; + uint32_t new_mask = bo->mem.mask | + DRM_BO_FLAG_MAPPABLE | + DRM_BO_FLAG_FORCE_MAPPABLE; + + do { + err = drm_bo_move_buffer(bo, new_mask, 0, 0); + } while((err == -EAGAIN) && !time_after_eq(jiffies, _end)); + + if (err) { + DRM_ERROR("Timeout moving buffer to mappable location.\n"); + data->type = VM_FAULT_SIGBUS; + goto out_unlock; + } + } +#endif if (address > vma->vm_end) { data->type = VM_FAULT_SIGBUS; @@ -793,7 +817,7 @@ struct page *drm_bo_vm_fault(struct vm_area_struct *vma, if (bus_size) { pfn = ((bus_base + bus_offset) >> PAGE_SHIFT) + page_offset; - pgprot = drm_io_prot(_DRM_AGP, vma); + vma->vm_page_prot = drm_io_prot(_DRM_AGP, vma); } else { ttm = bo->ttm; @@ -804,10 +828,10 @@ struct page *drm_bo_vm_fault(struct vm_area_struct *vma, goto out_unlock; } pfn = page_to_pfn(page); - pgprot = vma->vm_page_prot; + vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); } - err = vm_insert_pfn(vma, address, pfn, pgprot); + err = vm_insert_pfn(vma, address, pfn); if (!err || err == -EBUSY) data->type = VM_FAULT_MINOR; @@ -870,10 +894,14 @@ static void drm_bo_vm_close(struct vm_area_struct *vma) } static struct vm_operations_struct drm_bo_vm_ops = { -#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,21)) - .nopage = drm_bo_vm_nopage, -#else +#ifdef DRM_FULL_MM_COMPAT .fault = drm_bo_vm_fault, +#else +#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,19)) + .nopfn = drm_bo_vm_nopfn, +#else + .nopage = drm_bo_vm_nopage, +#endif #endif .open = drm_bo_vm_open, .close = drm_bo_vm_close, @@ -896,6 +924,9 @@ int drm_bo_mmap_locked(struct vm_area_struct *vma, vma->vm_private_data = map->handle; vma->vm_file = filp; vma->vm_flags |= VM_RESERVED | VM_IO; +#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,19)) + vma->vm_flags |= VM_PFNMAP; +#endif drm_bo_vm_open_locked(vma); #ifdef DRM_ODD_MM_COMPAT drm_bo_map_bound(vma); |