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SubjectRe: [PATCH 4/9] drm/ttm: Allow the driver to provide the ttm struct vm_operations_struct
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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@amd.com>
> > >
> > > Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
> > > Reviewed-by: Christian König <christian.koenig@amd.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
> > > *
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