On 07/10/2021 14:40, Jason Gunthorpe wrote:
> On Thu, Oct 07, 2021 at 01:43:00PM +0300, Gal Pressman wrote:
>
>> @@ -1491,26 +1493,29 @@ static int efa_create_pbl(struct efa_dev *dev,
>> return 0;
>> }
>>
>> -struct ib_mr *efa_reg_mr(struct ib_pd *ibpd, u64 start, u64 length,
>> - u64 virt_addr, int access_flags,
>> - struct ib_udata *udata)
>> +static void efa_dmabuf_invalidate_cb(struct dma_buf_attachment *attach)
>> +{
>> + WARN_ON_ONCE(1,
>> + "Invalidate callback should not be called when memory is pinned\n");
>> +}
>> +
>> +static struct dma_buf_attach_ops efa_dmabuf_attach_ops = {
>> + .allow_peer2peer = true,
>> + .move_notify = efa_dmabuf_invalidate_cb,
>> +};
>
> Shouldn't move_notify really just be left as NULL? I mean fixing
> whatever is preventing that?
That's what I had in the previous RFC and I think Christian didn't really like it.
>> +struct ib_mr *efa_reg_user_mr_dmabuf(struct ib_pd *ibpd, u64 start,
>> + u64 length, u64 virt_addr,
>> + int fd, int access_flags,
>> + struct ib_udata *udata)
>> +{
>> + struct efa_dev *dev = to_edev(ibpd->device);
>> + struct ib_umem_dmabuf *umem_dmabuf;
>> + struct efa_mr *mr;
>> + int err;
>> +
>> + mr = efa_alloc_mr(ibpd, access_flags, udata);
>> + if (IS_ERR(mr)) {
>> + err = PTR_ERR(mr);
>> + goto err_out;
>> + }
>> +
>> + umem_dmabuf = ib_umem_dmabuf_get(ibpd->device, start, length, fd,
>> + access_flags, &efa_dmabuf_attach_ops);
>> + if (IS_ERR(umem_dmabuf)) {
>> + ibdev_dbg(&dev->ibdev, "Failed to get dmabuf[%d]\n", err);
>> + err = PTR_ERR(umem_dmabuf);
>> + goto err_free;
>> + }
>> +
>> + dma_resv_lock(umem_dmabuf->attach->dmabuf->resv, NULL);
>> + err = dma_buf_pin(umem_dmabuf->attach);
>> + if (err) {
>> + ibdev_dbg(&dev->ibdev, "Failed to pin dmabuf memory\n");
>> + goto err_release;
>> + }
>> +
>> + err = ib_umem_dmabuf_map_pages(umem_dmabuf);
>> + if (err) {
>> + ibdev_dbg(&dev->ibdev, "Failed to map dmabuf pages\n");
>> + goto err_unpin;
>> + }
>> + dma_resv_unlock(umem_dmabuf->attach->dmabuf->resv);
>
> If it is really this simple the core code should have this logic,
> 'ib_umem_dmabuf_get_pinned()' or something
Should get_pinned do just get + dma_buf_pin, or should it do
ib_umem_dmabuf_map_pages as well?
