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

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Message-ID: <1dc89cb4bea186ced4cc11ce49586cf651564d88.camel@vmware.com>
Date:   Thu, 25 Apr 2019 08:35:50 +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

Hi, Christian,

On Wed, 2019-04-24 at 16:20 +0200, Thomas Hellström wrote:
> 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

Is this OK with you?

Thanks,
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
> > >    *