From 413b75745f9f712ff7e015c6c82ed3d394a385df Mon Sep 17 00:00:00 2001 From: Thomas Zimmermann Date: Fri, 7 Jul 2023 10:31:59 +0200 Subject: [PATCH] drm/omapdrm: Set VM flags in GEM-object mmap function Use the mmap callback in struct drm_gem_object_funcs to set the VM flags. Replace a number of mmap helpers in omapdrm with their GEM helper counterparts. Generate DRM's file-operations instance with GEM's DEFINE_DRM_GEM_FOPS. The omapdrm driver uses DRM's drm_gem_mmap() helper to prepare the VMA structure. It then modifies the resulting VMA state in its own helper omap_gem_mmap_obj(). The patch improves this by setting up the VMA in the mmap callback in drm_gem_object_funcs, which is called from within drm_gem_mmap(). Omapdrm's omap_gem_mmap() and omap_gem_mmap() can then be removed from the driver. A call to drm_gem_mmap() is sufficient for the mmap operation. Finally, with the omap functions gone, the drivers file_ops in omapdriver_fops can be generated with DEFINE_DRM_GEM_FOPS, which sets DRM's default helpers. v2: * detailed commit message (Javier) * do not set VM_PFNMAP Signed-off-by: Thomas Zimmermann Reviewed-by: Javier Martinez Canillas Acked-by: Maxime Ripard Cc: Tomi Valkeinen Link: https://patchwork.freedesktop.org/patch/msgid/20230707083422.18691-9-tzimmermann@suse.de --- drivers/gpu/drm/omapdrm/omap_drv.c | 12 +----------- drivers/gpu/drm/omapdrm/omap_gem.c | 24 ++++++----------------- drivers/gpu/drm/omapdrm/omap_gem.h | 3 --- drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c | 7 +------ 4 files changed, 8 insertions(+), 38 deletions(-) diff --git a/drivers/gpu/drm/omapdrm/omap_drv.c b/drivers/gpu/drm/omapdrm/omap_drv.c index e2697fe80e62..afeeb7737552 100644 --- a/drivers/gpu/drm/omapdrm/omap_drv.c +++ b/drivers/gpu/drm/omapdrm/omap_drv.c @@ -636,17 +636,7 @@ static int dev_open(struct drm_device *dev, struct drm_file *file) return 0; } -static const struct file_operations omapdriver_fops = { - .owner = THIS_MODULE, - .open = drm_open, - .unlocked_ioctl = drm_ioctl, - .compat_ioctl = drm_compat_ioctl, - .release = drm_release, - .mmap = omap_gem_mmap, - .poll = drm_poll, - .read = drm_read, - .llseek = noop_llseek, -}; +DEFINE_DRM_GEM_FOPS(omapdriver_fops); static const struct drm_driver omap_drm_driver = { .driver_features = DRIVER_MODESET | DRIVER_GEM | diff --git a/drivers/gpu/drm/omapdrm/omap_gem.c b/drivers/gpu/drm/omapdrm/omap_gem.c index 6b58a5bb7b44..c48fa531ca32 100644 --- a/drivers/gpu/drm/omapdrm/omap_gem.c +++ b/drivers/gpu/drm/omapdrm/omap_gem.c @@ -524,26 +524,11 @@ static vm_fault_t omap_gem_fault(struct vm_fault *vmf) return ret; } -/** We override mainly to fix up some of the vm mapping flags.. */ -int omap_gem_mmap(struct file *filp, struct vm_area_struct *vma) -{ - int ret; - - ret = drm_gem_mmap(filp, vma); - if (ret) { - DBG("mmap failed: %d", ret); - return ret; - } - - return omap_gem_mmap_obj(vma->vm_private_data, vma); -} - -int omap_gem_mmap_obj(struct drm_gem_object *obj, - struct vm_area_struct *vma) +static int omap_gem_object_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma) { struct omap_gem_object *omap_obj = to_omap_bo(obj); - vm_flags_mod(vma, VM_MIXEDMAP, VM_PFNMAP); + vm_flags_set(vma, VM_DONTEXPAND | VM_DONTDUMP | VM_IO | VM_MIXEDMAP); if (omap_obj->flags & OMAP_BO_WC) { vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags)); @@ -563,12 +548,14 @@ int omap_gem_mmap_obj(struct drm_gem_object *obj, * address_space (so unmap_mapping_range does what we want, * in particular in the case of mmap'd dmabufs) */ - vma->vm_pgoff = 0; + vma->vm_pgoff -= drm_vma_node_start(&obj->vma_node); vma_set_file(vma, obj->filp); vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); } + vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot); + return 0; } @@ -1282,6 +1269,7 @@ static const struct vm_operations_struct omap_gem_vm_ops = { static const struct drm_gem_object_funcs omap_gem_object_funcs = { .free = omap_gem_free_object, .export = omap_gem_prime_export, + .mmap = omap_gem_object_mmap, .vm_ops = &omap_gem_vm_ops, }; diff --git a/drivers/gpu/drm/omapdrm/omap_gem.h b/drivers/gpu/drm/omapdrm/omap_gem.h index 4d4488939f6b..fec3fa0e4c33 100644 --- a/drivers/gpu/drm/omapdrm/omap_gem.h +++ b/drivers/gpu/drm/omapdrm/omap_gem.h @@ -57,9 +57,6 @@ int omap_gem_dumb_create(struct drm_file *file, struct drm_device *dev, struct drm_mode_create_dumb *args); /* mmap() Interface */ -int omap_gem_mmap(struct file *filp, struct vm_area_struct *vma); -int omap_gem_mmap_obj(struct drm_gem_object *obj, - struct vm_area_struct *vma); u64 omap_gem_mmap_offset(struct drm_gem_object *obj); size_t omap_gem_mmap_size(struct drm_gem_object *obj); diff --git a/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c b/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c index 8e194dbc9506..36f9ee4baad3 100644 --- a/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c +++ b/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c @@ -64,13 +64,8 @@ static int omap_gem_dmabuf_mmap(struct dma_buf *buffer, struct vm_area_struct *vma) { struct drm_gem_object *obj = buffer->priv; - int ret = 0; - ret = drm_gem_mmap_obj(obj, omap_gem_mmap_size(obj), vma); - if (ret < 0) - return ret; - - return omap_gem_mmap_obj(obj, vma); + return drm_gem_mmap_obj(obj, omap_gem_mmap_size(obj), vma); } static const struct dma_buf_ops omap_dmabuf_ops = {