[PATCH] drm/vkms: prime import support

[Vasilev, Oleg]

On Wed, 2019-07-10 at 17:31 +0200, Daniel Vetter wrote:
> On Thu, Jul 04, 2019 at 11:54:10AM +0300, Oleg Vasilev wrote:
> > Bring dmabuf sharing through implementing prime_import_sg_table
> > callback.
> > This will help to validate userspace conformance in prime
> > configurations
> > without using any actual hardware (e.g. in the cloud).
> > 
> > Cc: Rodrigo Siqueira <rodrigosiqueiramelo at gmail.com>
> > Cc: Haneen Mohammed <hamohammed.sa at gmail.com>
> > Cc: Daniel Vetter <daniel at ffwll.ch>
> > Signed-off-by: Oleg Vasilev <oleg.vasilev at intel.com>
> 
> Btw which igt testcases does this enable? Are the igt patches already
> merged (I think as-is the igt prime tests won't run on vkms).
> 
> Imo for vkms we really want to make sure there's tests for
> everything,
> otherwise a fake driver for testing/validation is kinda pointless ...
> -Daniel

I've submitted a patch to IGT, but it is not merged yet:
https://patchwork.freedesktop.org/series/63213/

Oleg
> 
> > ---
> >  drivers/gpu/drm/vkms/vkms_drv.c |  6 +++++
> >  drivers/gpu/drm/vkms/vkms_drv.h |  9 +++++++
> >  drivers/gpu/drm/vkms/vkms_gem.c | 46
> > +++++++++++++++++++++++++++++++++
> >  3 files changed, 61 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/vkms/vkms_drv.c
> > b/drivers/gpu/drm/vkms/vkms_drv.c
> > index cc53ef88a331..b71c16d9ca09 100644
> > --- a/drivers/gpu/drm/vkms/vkms_drv.c
> > +++ b/drivers/gpu/drm/vkms/vkms_drv.c
> > @@ -10,6 +10,7 @@
> >   */
> >  
> >  #include <linux/module.h>
> > +#include <linux/dma-buf.h>
> >  #include <drm/drm_gem.h>
> >  #include <drm/drm_atomic.h>
> >  #include <drm/drm_atomic_helper.h>
> > @@ -96,6 +97,8 @@ static struct drm_driver vkms_driver = {
> >  	.gem_vm_ops		= &vkms_gem_vm_ops,
> >  	.gem_free_object_unlocked = vkms_gem_free_object,
> >  	.get_vblank_timestamp	= vkms_get_vblank_timestamp,
> > +	.prime_fd_to_handle	= drm_gem_prime_fd_to_handle,
> > +	.gem_prime_import_sg_table = vkms_prime_import_sg_table,
> >  
> >  	.name			= DRIVER_NAME,
> >  	.desc			= DRIVER_DESC,
> > @@ -147,6 +150,9 @@ static int __init vkms_init(void)
> >  
> >  	ret = drm_dev_init(&vkms_device->drm, &vkms_driver,
> >  			   &vkms_device->platform->dev);
> > +
> > +	dma_coerce_mask_and_coherent(vkms_device->drm.dev,
> > +				     DMA_BIT_MASK(64));
> >  	if (ret)
> >  		goto out_unregister;
> >  
> > diff --git a/drivers/gpu/drm/vkms/vkms_drv.h
> > b/drivers/gpu/drm/vkms/vkms_drv.h
> > index 12b4db7ac641..fb15101c8f3e 100644
> > --- a/drivers/gpu/drm/vkms/vkms_drv.h
> > +++ b/drivers/gpu/drm/vkms/vkms_drv.h
> > @@ -126,6 +126,9 @@ struct drm_gem_object *vkms_gem_create(struct
> > drm_device *dev,
> >  				       u32 *handle,
> >  				       u64 size);
> >  
> > +struct vkms_gem_object *vkms_gem_create_private(struct drm_device
> > *dev,
> > +						u64 size);
> > +
> >  vm_fault_t vkms_gem_fault(struct vm_fault *vmf);
> >  
> >  int vkms_dumb_create(struct drm_file *file, struct drm_device
> > *dev,
> > @@ -137,6 +140,12 @@ int vkms_gem_vmap(struct drm_gem_object *obj);
> >  
> >  void vkms_gem_vunmap(struct drm_gem_object *obj);
> >  
> > +/* Prime */
> > +struct drm_gem_object *
> > +vkms_prime_import_sg_table(struct drm_device *dev,
> > +			   struct dma_buf_attachment *attach,
> > +			   struct sg_table *sg);
> > +
> >  /* CRC Support */
> >  const char *const *vkms_get_crc_sources(struct drm_crtc *crtc,
> >  					size_t *count);
> > diff --git a/drivers/gpu/drm/vkms/vkms_gem.c
> > b/drivers/gpu/drm/vkms/vkms_gem.c
> > index 69048e73377d..a1b837460f63 100644
> > --- a/drivers/gpu/drm/vkms/vkms_gem.c
> > +++ b/drivers/gpu/drm/vkms/vkms_gem.c
> > @@ -1,5 +1,6 @@
> >  // SPDX-License-Identifier: GPL-2.0+
> >  
> > +#include <linux/dma-buf.h>
> >  #include <linux/shmem_fs.h>
> >  
> >  #include "vkms_drv.h"
> > @@ -117,6 +118,25 @@ struct drm_gem_object *vkms_gem_create(struct
> > drm_device *dev,
> >  	return &obj->gem;
> >  }
> >  
> > +struct vkms_gem_object *vkms_gem_create_private(struct drm_device
> > *dev,
> > +						u64 size)
> > +{
> > +	struct vkms_gem_object *obj;
> > +
> > +	obj = kzalloc(sizeof(*obj), GFP_KERNEL);
> > +
> > +	if (!obj)
> > +		return ERR_PTR(-ENOMEM);
> > +
> > +	size = roundup(size, PAGE_SIZE);
> > +
> > +	drm_gem_private_object_init(dev, &obj->gem, size);
> > +
> > +	mutex_init(&obj->pages_lock);
> > +
> > +	return obj;
> > +}
> > +
> >  int vkms_dumb_create(struct drm_file *file, struct drm_device
> > *dev,
> >  		     struct drm_mode_create_dumb *args)
> >  {
> > @@ -217,3 +237,29 @@ int vkms_gem_vmap(struct drm_gem_object *obj)
> >  	mutex_unlock(&vkms_obj->pages_lock);
> >  	return ret;
> >  }
> > +
> > +struct drm_gem_object *
> > +vkms_prime_import_sg_table(struct drm_device *dev,
> > +			   struct dma_buf_attachment *attach,
> > +			   struct sg_table *sg)
> > +{
> > +	struct vkms_gem_object *obj;
> > +	int npages;
> > +
> > +	obj = __vkms_gem_create(dev, attach->dmabuf->size);
> > +	if (IS_ERR(obj))
> > +		return ERR_CAST(obj);
> > +
> > +	npages = PAGE_ALIGN(attach->dmabuf->size) / PAGE_SIZE;
> > +	DRM_DEBUG_PRIME("Importing %d  pages\n", npages);
> > +
> > +	obj->pages = kvmalloc_array(npages, sizeof(struct page *),
> > GFP_KERNEL);
> > +	if (!obj->pages) {
> > +		vkms_gem_free_object(&obj->gem);
> > +		return ERR_PTR(-ENOMEM);
> > +	}
> > +
> > +	drm_prime_sg_to_page_addr_arrays(sg, obj->pages, NULL,
> > +					 npages);
> > +	return &obj->gem;
> > +}
> > -- 
> > 2.22.0
> > 
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