[Intel-gfx] [RFC 06/13] drm/i915/svm: Page table mirroring support

[Jason Gunthorpe]

On Fri, Nov 22, 2019 at 12:01:17PM -0800, Niranjan Vishwanathapura wrote:
> On Fri, Nov 22, 2019 at 11:54:45AM -0800, Niranjana Vishwanathapura wrote:
> > Use HMM page table mirroring support to build device page table.
> > Implement the bind ioctl and bind the process address range in the
> > specified context's ppgtt.
> > Handle invalidation notifications by unbinding the address range.
> > 
> > Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
> > Cc: Jon Bloomfield <jon.bloomfield at intel.com>
> > Cc: Daniel Vetter <daniel.vetter at intel.com>
> > Cc: Sudeep Dutt <sudeep.dutt at intel.com>
> > Signed-off-by: Niranjana Vishwanathapura <niranjana.vishwanathapura at intel.com>
> > +int i915_svm_bind_mm(struct i915_address_space *vm)
> > +{
> > +	struct i915_svm *svm;
> > +	struct mm_struct *mm;
> > +	int ret = 0;
> > +
> > +	mm = get_task_mm(current);
> > +	down_write(&mm->mmap_sem);
> > +	mutex_lock(&vm->svm_mutex);
> > +	if (vm->svm)
> > +		goto bind_out;
> > +
> > +	svm = kzalloc(sizeof(*svm), GFP_KERNEL);
> > +	if (!svm) {
> > +		ret = -ENOMEM;
> > +		goto bind_out;
> > +	}
> > +	svm->mirror.ops = &i915_mirror_ops;
> > +	mutex_init(&svm->mutex);
> > +	kref_init(&svm->ref);
> > +	svm->mm = mm;
> > +	svm->vm = vm;
> > +
> > +	ret = hmm_mirror_register(&svm->mirror, mm);
> 
> I saw that these APIs have been removed.
> I will update once it gets included in kernel release.

I would like to see all the mmu notifier use in i916 updated to use
the new APIs :)

Please cc me when you post patches using the new APIs, I'd like to see
how they are being used.

Regards,
Jason