ping for review Am 24.06.21 um 11:53 schrieb Thomas Zimmermann:
Moving the driver-specific mmap code into a GEM object function allows for using DRM helpers for various mmap callbacks. The respective xen functions are being removed. The file_operations structure fops is now being created by the helper macro DEFINE_DRM_GEM_FOPS(). Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx> --- drivers/gpu/drm/xen/xen_drm_front.c | 16 +--- drivers/gpu/drm/xen/xen_drm_front_gem.c | 108 +++++++++--------------- drivers/gpu/drm/xen/xen_drm_front_gem.h | 7 -- 3 files changed, 44 insertions(+), 87 deletions(-) diff --git a/drivers/gpu/drm/xen/xen_drm_front.c b/drivers/gpu/drm/xen/xen_drm_front.c index 9f14d99c763c..434064c820e8 100644 --- a/drivers/gpu/drm/xen/xen_drm_front.c +++ b/drivers/gpu/drm/xen/xen_drm_front.c @@ -469,19 +469,7 @@ static void xen_drm_drv_release(struct drm_device *dev) kfree(drm_info); }-static const struct file_operations xen_drm_dev_fops = {- .owner = THIS_MODULE, - .open = drm_open, - .release = drm_release, - .unlocked_ioctl = drm_ioctl, -#ifdef CONFIG_COMPAT - .compat_ioctl = drm_compat_ioctl, -#endif - .poll = drm_poll, - .read = drm_read, - .llseek = no_llseek, - .mmap = xen_drm_front_gem_mmap, -}; +DEFINE_DRM_GEM_FOPS(xen_drm_dev_fops);static const struct drm_driver xen_drm_driver = {.driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC, @@ -489,7 +477,7 @@ static const struct drm_driver xen_drm_driver = { .prime_handle_to_fd = drm_gem_prime_handle_to_fd, .prime_fd_to_handle = drm_gem_prime_fd_to_handle, .gem_prime_import_sg_table = xen_drm_front_gem_import_sg_table, - .gem_prime_mmap = xen_drm_front_gem_prime_mmap, + .gem_prime_mmap = drm_gem_prime_mmap, .dumb_create = xen_drm_drv_dumb_create, .fops = &xen_drm_dev_fops, .name = "xendrm-du", diff --git a/drivers/gpu/drm/xen/xen_drm_front_gem.c b/drivers/gpu/drm/xen/xen_drm_front_gem.c index b293c67230ef..dd358ba2bf8e 100644 --- a/drivers/gpu/drm/xen/xen_drm_front_gem.c +++ b/drivers/gpu/drm/xen/xen_drm_front_gem.c @@ -57,6 +57,47 @@ static void gem_free_pages_array(struct xen_gem_object *xen_obj) xen_obj->pages = NULL; }+static int xen_drm_front_gem_object_mmap(struct drm_gem_object *gem_obj,+ struct vm_area_struct *vma) +{ + struct xen_gem_object *xen_obj = to_xen_gem_obj(gem_obj); + int ret; + + vma->vm_ops = gem_obj->funcs->vm_ops; + + /* + * Clear the VM_PFNMAP flag that was set by drm_gem_mmap(), and set the + * vm_pgoff (used as a fake buffer offset by DRM) to 0 as we want to map + * the whole buffer. + */ + vma->vm_flags &= ~VM_PFNMAP; + vma->vm_flags |= VM_MIXEDMAP; + vma->vm_pgoff = 0; + + /* + * According to Xen on ARM ABI (xen/include/public/arch-arm.h): + * all memory which is shared with other entities in the system + * (including the hypervisor and other guests) must reside in memory + * which is mapped as Normal Inner Write-Back Outer Write-Back + * Inner-Shareable. + */ + vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); + + /* + * vm_operations_struct.fault handler will be called if CPU access + * to VM is here. For GPUs this isn't the case, because CPU doesn't + * touch the memory. Insert pages now, so both CPU and GPU are happy. + * + * FIXME: as we insert all the pages now then no .fault handler must + * be called, so don't provide one + */ + ret = vm_map_pages(vma, xen_obj->pages, xen_obj->num_pages); + if (ret < 0) + DRM_ERROR("Failed to map pages into vma: %d\n", ret); + + return ret; +} + static const struct vm_operations_struct xen_drm_drv_vm_ops = { .open = drm_gem_vm_open, .close = drm_gem_vm_close, @@ -67,6 +108,7 @@ static const struct drm_gem_object_funcs xen_drm_front_gem_object_funcs = { .get_sg_table = xen_drm_front_gem_get_sg_table, .vmap = xen_drm_front_gem_prime_vmap, .vunmap = xen_drm_front_gem_prime_vunmap, + .mmap = xen_drm_front_gem_object_mmap, .vm_ops = &xen_drm_drv_vm_ops, };@@ -238,58 +280,6 @@ xen_drm_front_gem_import_sg_table(struct drm_device *dev,return &xen_obj->base; }-static int gem_mmap_obj(struct xen_gem_object *xen_obj,- struct vm_area_struct *vma) -{ - int ret; - - /* - * clear the VM_PFNMAP flag that was set by drm_gem_mmap(), and set the - * vm_pgoff (used as a fake buffer offset by DRM) to 0 as we want to map - * the whole buffer. - */ - vma->vm_flags &= ~VM_PFNMAP; - vma->vm_flags |= VM_MIXEDMAP; - vma->vm_pgoff = 0; - /* - * According to Xen on ARM ABI (xen/include/public/arch-arm.h): - * all memory which is shared with other entities in the system - * (including the hypervisor and other guests) must reside in memory - * which is mapped as Normal Inner Write-Back Outer Write-Back - * Inner-Shareable. - */ - vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); - - /* - * vm_operations_struct.fault handler will be called if CPU access - * to VM is here. For GPUs this isn't the case, because CPU - * doesn't touch the memory. Insert pages now, so both CPU and GPU are - * happy. - * FIXME: as we insert all the pages now then no .fault handler must - * be called, so don't provide one - */ - ret = vm_map_pages(vma, xen_obj->pages, xen_obj->num_pages); - if (ret < 0) - DRM_ERROR("Failed to map pages into vma: %d\n", ret); - - return ret; -} - -int xen_drm_front_gem_mmap(struct file *filp, struct vm_area_struct *vma) -{ - struct xen_gem_object *xen_obj; - struct drm_gem_object *gem_obj; - int ret; - - ret = drm_gem_mmap(filp, vma); - if (ret < 0) - return ret; - - gem_obj = vma->vm_private_data; - xen_obj = to_xen_gem_obj(gem_obj); - return gem_mmap_obj(xen_obj, vma); -} - int xen_drm_front_gem_prime_vmap(struct drm_gem_object *gem_obj, struct dma_buf_map *map) { struct xen_gem_object *xen_obj = to_xen_gem_obj(gem_obj); @@ -313,17 +303,3 @@ void xen_drm_front_gem_prime_vunmap(struct drm_gem_object *gem_obj, { vunmap(map->vaddr); } - -int xen_drm_front_gem_prime_mmap(struct drm_gem_object *gem_obj, - struct vm_area_struct *vma) -{ - struct xen_gem_object *xen_obj; - int ret; - - ret = drm_gem_mmap_obj(gem_obj, gem_obj->size, vma); - if (ret < 0) - return ret; - - xen_obj = to_xen_gem_obj(gem_obj); - return gem_mmap_obj(xen_obj, vma); -} diff --git a/drivers/gpu/drm/xen/xen_drm_front_gem.h b/drivers/gpu/drm/xen/xen_drm_front_gem.h index a4e67d0a149c..eaea470f7001 100644 --- a/drivers/gpu/drm/xen/xen_drm_front_gem.h +++ b/drivers/gpu/drm/xen/xen_drm_front_gem.h @@ -15,9 +15,7 @@ struct dma_buf_attachment; struct dma_buf_map; struct drm_device; struct drm_gem_object; -struct file; struct sg_table; -struct vm_area_struct;struct drm_gem_object *xen_drm_front_gem_create(struct drm_device *dev,size_t size); @@ -33,15 +31,10 @@ struct page **xen_drm_front_gem_get_pages(struct drm_gem_object *obj);void xen_drm_front_gem_free_object_unlocked(struct drm_gem_object *gem_obj); -int xen_drm_front_gem_mmap(struct file *filp, struct vm_area_struct *vma);- int xen_drm_front_gem_prime_vmap(struct drm_gem_object *gem_obj, struct dma_buf_map *map);void xen_drm_front_gem_prime_vunmap(struct drm_gem_object *gem_obj,struct dma_buf_map *map);-int xen_drm_front_gem_prime_mmap(struct drm_gem_object *gem_obj,- struct vm_area_struct *vma); - #endif /* __XEN_DRM_FRONT_GEM_H */
-- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Maxfeldstr. 5, 90409 Nürnberg, Germany (HRB 36809, AG Nürnberg) Geschäftsführer: Felix Imendörffer
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