linux-kernel - Re: [PATCH 4/9] drm/ttm: Allow the driver to provide the ttm struct vm_operations

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Date:   Wed, 24 Apr 2019 14:20:24 +0000
From:   Thomas Hellstrom <thellstrom@...are.com>
To:     "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        Linux-graphics-maintainer <Linux-graphics-maintainer@...are.com>,
        "Christian.Koenig@....com" <Christian.Koenig@....com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Pv-drivers <Pv-drivers@...are.com>
Subject: Re: [PATCH 4/9] drm/ttm: Allow the driver to provide the ttm struct
 vm_operations_struct

On Wed, 2019-04-24 at 14:10 +0000, Koenig, Christian wrote:
> Am 24.04.19 um 14:00 schrieb Thomas Hellstrom:
> > Add a pointer to the struct vm_operations_struct in the bo_device,
> > and
> > assign that pointer to the default value currently used.
> > 
> > The driver can then optionally modify that pointer and the new
> > value
> > can be used for each new vma created.
> > 
> > Cc: "Christian König" <christian.koenig@....com>
> > 
> > Signed-off-by: Thomas Hellstrom <thellstrom@...are.com>
> > Reviewed-by: Christian König <christian.koenig@....com>
> 
> Going to pick those two TTM patches up for amd-staging-drm-next.

Will you be relying on either patch for related work? Otherwise it
would be simpler for us to use vmwgfx-next for the whole series,
targeting 5.3.

Thomas

> 
> Christian.
> 
> > ---
> >   drivers/gpu/drm/ttm/ttm_bo.c    | 1 +
> >   drivers/gpu/drm/ttm/ttm_bo_vm.c | 6 +++---
> >   include/drm/ttm/ttm_bo_driver.h | 6 ++++++
> >   3 files changed, 10 insertions(+), 3 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/ttm/ttm_bo.c
> > b/drivers/gpu/drm/ttm/ttm_bo.c
> > index 3f56647cdb35..1c85bec00472 100644
> > --- a/drivers/gpu/drm/ttm/ttm_bo.c
> > +++ b/drivers/gpu/drm/ttm/ttm_bo.c
> > @@ -1656,6 +1656,7 @@ int ttm_bo_device_init(struct ttm_bo_device
> > *bdev,
> >   	mutex_lock(&ttm_global_mutex);
> >   	list_add_tail(&bdev->device_list, &glob->device_list);
> >   	mutex_unlock(&ttm_global_mutex);
> > +	bdev->vm_ops = &ttm_bo_vm_ops;
> >   
> >   	return 0;
> >   out_no_sys:
> > diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c
> > b/drivers/gpu/drm/ttm/ttm_bo_vm.c
> > index e86a29a1e51f..bfb25b81fed7 100644
> > --- a/drivers/gpu/drm/ttm/ttm_bo_vm.c
> > +++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c
> > @@ -395,7 +395,7 @@ static int ttm_bo_vm_access(struct
> > vm_area_struct *vma, unsigned long addr,
> >   	return ret;
> >   }
> >   
> > -static const struct vm_operations_struct ttm_bo_vm_ops = {
> > +const struct vm_operations_struct ttm_bo_vm_ops = {
> >   	.fault = ttm_bo_vm_fault,
> >   	.open = ttm_bo_vm_open,
> >   	.close = ttm_bo_vm_close,
> > @@ -445,7 +445,7 @@ int ttm_bo_mmap(struct file *filp, struct
> > vm_area_struct *vma,
> >   	if (unlikely(ret != 0))
> >   		goto out_unref;
> >   
> > -	vma->vm_ops = &ttm_bo_vm_ops;
> > +	vma->vm_ops = bdev->vm_ops;
> >   
> >   	/*
> >   	 * Note: We're transferring the bo reference to
> > @@ -477,7 +477,7 @@ int ttm_fbdev_mmap(struct vm_area_struct *vma,
> > struct ttm_buffer_object *bo)
> >   
> >   	ttm_bo_get(bo);
> >   
> > -	vma->vm_ops = &ttm_bo_vm_ops;
> > +	vma->vm_ops = bo->bdev->vm_ops;
> >   	vma->vm_private_data = bo;
> >   	vma->vm_flags |= VM_MIXEDMAP;
> >   	vma->vm_flags |= VM_IO | VM_DONTEXPAND;
> > diff --git a/include/drm/ttm/ttm_bo_driver.h
> > b/include/drm/ttm/ttm_bo_driver.h
> > index cbf3180cb612..cfeaff5d9706 100644
> > --- a/include/drm/ttm/ttm_bo_driver.h
> > +++ b/include/drm/ttm/ttm_bo_driver.h
> > @@ -443,6 +443,9 @@ extern struct ttm_bo_global {
> >    * @driver: Pointer to a struct ttm_bo_driver struct setup by the
> > driver.
> >    * @man: An array of mem_type_managers.
> >    * @vma_manager: Address space manager
> > + * @vm_ops: Pointer to the struct vm_operations_struct used for
> > this
> > + * device's VM operations. The driver may override this before the
> > first
> > + * mmap() call.
> >    * lru_lock: Spinlock that protects the buffer+device lru lists
> > and
> >    * ddestroy lists.
> >    * @dev_mapping: A pointer to the struct address_space
> > representing the
> > @@ -461,6 +464,7 @@ struct ttm_bo_device {
> >   	struct ttm_bo_global *glob;
> >   	struct ttm_bo_driver *driver;
> >   	struct ttm_mem_type_manager man[TTM_NUM_MEM_TYPES];
> > +	const struct vm_operations_struct *vm_ops;
> >   
> >   	/*
> >   	 * Protected by internal locks.
> > @@ -489,6 +493,8 @@ struct ttm_bo_device {
> >   	bool no_retry;
> >   };
> >   
> > +extern const struct vm_operations_struct ttm_bo_vm_ops;
> > +
> >   /**
> >    * struct ttm_lru_bulk_move_pos
> >    *