linux-imx

​

static void pci_p2pdma_percpu_release(struct percpu_ref *ref)

{

    struct pci_p2pdma *p2p =

        container_of(ref, struct pci_p2pdma, devmap_ref);

​

    complete_all(&p2p->devmap_ref_done);

}

​

{

    /*

     * pci_p2pdma_add_resource() may be called multiple times

     * by a driver and may register the percpu_kill devm action multiple

     * times. We only want the first action to actually kill the

     * percpu_ref.

     */

    if (percpu_ref_is_dying(ref))

        return;

​

    percpu_ref_kill(ref);

        return -ENOMEM;

​

    pgmap->res.start = pci_resource_start(pdev, bar) + offset;

    pgmap->res.end = pgmap->res.start + size - 1;

    pgmap->res.flags = pci_resource_flags(pdev, bar);

    pgmap->ref = &pdev->p2pdma->devmap_ref;

    pgmap->type = MEMORY_DEVICE_PCI_P2PDMA;

    pgmap->pci_p2pdma_bus_offset = pci_bus_address(pdev, bar) -

        pci_resource_start(pdev, bar);

​

    addr = devm_memremap_pages(&pdev->dev, pgmap);

    if (IS_ERR(addr)) {

        error = PTR_ERR(addr);

        goto pgmap_free;

    }

​

    error = gen_pool_add_virt(pdev->p2pdma->pool, (unsigned long)addr,

            pci_bus_address(pdev, bar) + offset,

            resource_size(&pgmap->res), dev_to_node(&pdev->dev));

    if (error)

        goto pgmap_free;

​

    pci_info(pdev, "added peer-to-peer DMA memory %pR\n",

         &pgmap->res);

​

    return 0;

​

pgmap_free:

    devm_kfree(&pdev->dev, pgmap);

    return error;

}

EXPORT_SYMBOL_GPL(pci_p2pdma_add_resource);