On Thu, Jun 21, 2018 at 09:16:13AM -0300, Rodrigo Siqueira wrote:
> VKMS currently does not handle dumb data, and as a consequence, it does
> not provide mechanisms for handling gem. This commit adds the necessary
> support for gem object/handler and the dumb functions.
>
> Signed-off-by: Rodrigo Siqueira <rodrigosiqueiramelo@xxxxxxxxx>
> ---
This looks good to me except with missing gem_free_object_unlocked callback,
which causes warning: Memory manager not clean during takedown.
Maybe it will be easier if we add this in another patch instead of creating v3 of
this patchset?
> drivers/gpu/drm/vkms/Makefile | 2 +-
> drivers/gpu/drm/vkms/vkms_drv.c | 9 ++
> drivers/gpu/drm/vkms/vkms_drv.h | 21 ++++
> drivers/gpu/drm/vkms/vkms_gem.c | 168 ++++++++++++++++++++++++++++++++
> 4 files changed, 199 insertions(+), 1 deletion(-)
> create mode 100644 drivers/gpu/drm/vkms/vkms_gem.c
>
> diff --git a/drivers/gpu/drm/vkms/Makefile b/drivers/gpu/drm/vkms/Makefile
> index 3f774a6a9c58..986297da51bf 100644
> --- a/drivers/gpu/drm/vkms/Makefile
> +++ b/drivers/gpu/drm/vkms/Makefile
> @@ -1,3 +1,3 @@
> -vkms-y := vkms_drv.o vkms_plane.o vkms_output.o vkms_crtc.o
> +vkms-y := vkms_drv.o vkms_plane.o vkms_output.o vkms_crtc.o vkms_gem.o
>
> obj-$(CONFIG_DRM_VKMS) += vkms.o
> diff --git a/drivers/gpu/drm/vkms/vkms_drv.c b/drivers/gpu/drm/vkms/vkms_drv.c
> index 740a4cbfed91..638bab9083b5 100644
> --- a/drivers/gpu/drm/vkms/vkms_drv.c
> +++ b/drivers/gpu/drm/vkms/vkms_drv.c
> @@ -37,6 +37,12 @@ static const struct file_operations vkms_driver_fops = {
> .release = drm_release,
> };
>
> +static const struct vm_operations_struct vkms_gem_vm_ops = {
> + .fault = vkms_gem_fault,
> + .open = drm_gem_vm_open,
> + .close = drm_gem_vm_close,
> +};
> +
> static void vkms_release(struct drm_device *dev)
> {
> struct vkms_device *vkms = container_of(dev, struct vkms_device, drm);
> @@ -50,6 +56,9 @@ static struct drm_driver vkms_driver = {
> .driver_features = DRIVER_MODESET | DRIVER_ATOMIC | DRIVER_GEM,
> .release = vkms_release,
> .fops = &vkms_driver_fops,
> + .dumb_create = vkms_dumb_create,
> + .dumb_map_offset = vkms_dumb_map,
> + .gem_vm_ops = &vkms_gem_vm_ops,
>
> .name = DRIVER_NAME,
> .desc = DRIVER_DESC,
> diff --git a/drivers/gpu/drm/vkms/vkms_drv.h b/drivers/gpu/drm/vkms/vkms_drv.h
> index b0f9d2e61a42..54bb3dd2b2c1 100644
> --- a/drivers/gpu/drm/vkms/vkms_drv.h
> +++ b/drivers/gpu/drm/vkms/vkms_drv.h
> @@ -3,6 +3,7 @@
>
> #include <drm/drmP.h>
> #include <drm/drm.h>
> +#include <drm/drm_gem.h>
> #include <drm/drm_encoder.h>
>
> static const u32 vkms_formats[] = {
> @@ -21,6 +22,12 @@ struct vkms_device {
> struct vkms_output output;
> };
>
> +struct vkms_gem_object {
> + struct drm_gem_object gem;
> + struct mutex pages_lock; /* Page lock used in page fault handler */
> + struct page **pages;
> +};
> +
> int vkms_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
> struct drm_plane *primary, struct drm_plane *cursor);
>
> @@ -28,4 +35,18 @@ int vkms_output_init(struct vkms_device *vkmsdev);
>
> struct drm_plane *vkms_plane_init(struct vkms_device *vkmsdev);
>
> +/* Gem stuff */
> +struct drm_gem_object *vkms_gem_create(struct drm_device *dev,
> + struct drm_file *file,
> + u32 *handle,
> + u64 size);
> +
> +int vkms_gem_fault(struct vm_fault *vmf);
> +
> +int vkms_dumb_create(struct drm_file *file, struct drm_device *dev,
> + struct drm_mode_create_dumb *args);
> +
> +int vkms_dumb_map(struct drm_file *file, struct drm_device *dev,
> + u32 handle, u64 *offset);
> +
> #endif /* _VKMS_DRV_H_ */
> diff --git a/drivers/gpu/drm/vkms/vkms_gem.c b/drivers/gpu/drm/vkms/vkms_gem.c
> new file mode 100644
> index 000000000000..9f820f56b9e0
> --- /dev/null
> +++ b/drivers/gpu/drm/vkms/vkms_gem.c
> @@ -0,0 +1,168 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + */
> +
> +#include <linux/shmem_fs.h>
> +
> +#include "vkms_drv.h"
> +
> +static struct vkms_gem_object *__vkms_gem_create(struct drm_device *dev,
> + u64 size)
> +{
> + struct vkms_gem_object *obj;
> + int ret;
> +
> + obj = kzalloc(sizeof(*obj), GFP_KERNEL);
> + if (!obj)
> + return ERR_PTR(-ENOMEM);
> +
> + size = roundup(size, PAGE_SIZE);
> + ret = drm_gem_object_init(dev, &obj->gem, size);
> + if (ret) {
> + kfree(obj);
> + return ERR_PTR(ret);
> + }
> +
> + mutex_init(&obj->pages_lock);
> +
> + return obj;
> +}
> +
> +int vkms_gem_fault(struct vm_fault *vmf)
> +{
> + struct vm_area_struct *vma = vmf->vma;
> + struct vkms_gem_object *obj = vma->vm_private_data;
> + unsigned long vaddr = vmf->address;
> + pgoff_t page_offset;
> + loff_t num_pages;
> + int ret;
> +
> + page_offset = (vaddr - vma->vm_start) >> PAGE_SHIFT;
> + num_pages = DIV_ROUND_UP(obj->gem.size, PAGE_SIZE);
> +
> + if (page_offset > num_pages)
> + return VM_FAULT_SIGBUS;
> +
> + ret = -ENOENT;
> + mutex_lock(&obj->pages_lock);
> + if (obj->pages) {
> + get_page(obj->pages[page_offset]);
> + vmf->page = obj->pages[page_offset];
> + ret = 0;
> + }
> + mutex_unlock(&obj->pages_lock);
> + if (ret) {
> + struct page *page;
> + struct address_space *mapping;
> +
> + mapping = file_inode(obj->gem.filp)->i_mapping;
> + page = shmem_read_mapping_page(mapping, page_offset);
> +
> + if (!IS_ERR(page)) {
> + vmf->page = page;
> + ret = 0;
> + } else {
> + switch (PTR_ERR(page)) {
> + case -ENOSPC:
> + case -ENOMEM:
> + ret = VM_FAULT_OOM;
> + break;
> + case -EBUSY:
> + ret = VM_FAULT_RETRY;
> + break;
> + case -EFAULT:
> + case -EINVAL:
> + ret = VM_FAULT_SIGBUS;
> + break;
> + default:
> + WARN_ON(PTR_ERR(page));
> + ret = VM_FAULT_SIGBUS;
> + break;
> + }
> + }
> + }
> + return ret;
> +}
> +
> +struct drm_gem_object *vkms_gem_create(struct drm_device *dev,
> + struct drm_file *file,
> + u32 *handle,
> + u64 size)
> +{
> + struct vkms_gem_object *obj;
> + int ret;
> +
> + if (!file || !dev || !handle)
> + return ERR_PTR(-EINVAL);
> +
> + obj = __vkms_gem_create(dev, size);
> + if (IS_ERR(obj))
> + return ERR_CAST(obj);
> +
> + ret = drm_gem_handle_create(file, &obj->gem, handle);
> + drm_gem_object_put_unlocked(&obj->gem);
> + if (ret) {
> + drm_gem_object_release(&obj->gem);
> + kfree(obj);
> + return ERR_PTR(ret);
> + }
> +
> + return &obj->gem;
> +}
> +
> +int vkms_dumb_create(struct drm_file *file, struct drm_device *dev,
> + struct drm_mode_create_dumb *args)
> +{
> + struct drm_gem_object *gem_obj;
> + u64 pitch, size;
> +
> + if (!args || !dev || !file)
> + return -EINVAL;
> +
> + pitch = args->width * DIV_ROUND_UP(args->bpp, 8);
> + size = pitch * args->height;
> +
> + if (!size)
> + return -EINVAL;
> +
> + gem_obj = vkms_gem_create(dev, file, &args->handle, size);
> + if (IS_ERR(gem_obj))
> + return PTR_ERR(gem_obj);
> +
> + args->size = gem_obj->size;
> + args->pitch = pitch;
> +
> + DRM_DEBUG_DRIVER("Created object of size %lld\n", size);
> +
> + return 0;
> +}
> +
> +int vkms_dumb_map(struct drm_file *file, struct drm_device *dev,
> + u32 handle, u64 *offset)
> +{
> + struct drm_gem_object *obj;
> + int ret;
> +
> + obj = drm_gem_object_lookup(file, handle);
> + if (!obj)
> + return -ENOENT;
> +
> + if (!obj->filp) {
> + ret = -EINVAL;
> + goto unref;
> + }
> +
> + ret = drm_gem_create_mmap_offset(obj);
> + if (ret)
> + goto unref;
> +
> + *offset = drm_vma_node_offset_addr(&obj->vma_node);
> +unref:
> + drm_gem_object_put_unlocked(obj);
> +
> + return ret;
> +}
> --
> 2.17.1
>
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