On Wed, Mar 04, 2015 at 01:02:43PM -0700, Alex Williamson wrote:
> This copies the same support from pci-stub for exactly the same
> purpose, enabling a set of PCI IDs to be automatically added to the
> driver's dynamic ID table at module load time. The code here is
> pretty simple and both vfio-pci and pci-stub are fairly unique in
> being meta drivers, capable of attaching to any device, so there's no
> attempt made to generalize the code into pci-core.
>
> Signed-off-by: Alex Williamson <alex.williamson@xxxxxxxxxx>
> ---
> drivers/vfio/pci/vfio_pci.c | 46 +++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 46 insertions(+)
>
> diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
> index f8a1863..b3bae4c 100644
> --- a/drivers/vfio/pci/vfio_pci.c
> +++ b/drivers/vfio/pci/vfio_pci.c
> @@ -32,6 +32,10 @@
> #define DRIVER_AUTHOR "Alex Williamson <alex.williamson@xxxxxxxxxx>"
> #define DRIVER_DESC "VFIO PCI - User Level meta-driver"
>
> +static char ids[1024] __initdata;
> +module_param_string(ids, ids, sizeof(ids), 0);
> +MODULE_PARM_DESC(ids, "Initial PCI IDs to add to the vfio driver, format is \"vendor:device[:subvendor[:subdevice[:class[:class_mask]]]]\" and multiple comma separated entries can be specified");
> +
> static bool nointxmask;
> module_param_named(nointxmask, nointxmask, bool, S_IRUGO | S_IWUSR);
> MODULE_PARM_DESC(nointxmask,
> @@ -1034,6 +1038,46 @@ static void __exit vfio_pci_cleanup(void)
> vfio_pci_uninit_perm_bits();
> }
>
> +static void __init vfio_pci_fill_ids(void)
> +{
> + char *p, *id;
> + int rc;
> +
> + /* no ids passed actually */
> + if (ids[0] == '\0')
> + return;
> +
> + /* add ids specified in the module parameter */
> + p = ids;
> + while ((id = strsep(&p, ","))) {
> + unsigned int vendor, device, subvendor = PCI_ANY_ID,
> + subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
> + int fields;
> +
> + if (!strlen(id))
> + continue;
> +
> + fields = sscanf(id, "%x:%x:%x:%x:%x:%x",
> + &vendor, &device, &subvendor, &subdevice,
> + &class, &class_mask);
> +
> + if (fields < 2) {
> + pr_warn("vfio-pci: invalid id string \"%s\"\n", id);
> + continue;
> + }
> +
> + pr_info("vfio-pci: add %04X:%04X sub=%04X:%04X cls=%08X/%08X\n",
pci_setup_device() uses "[%04x:%04x] ... class %#08x". Maybe they should
be the same, at least as far as using upper/lower case, spelling out
"class", and "0x" prefix. Maybe there's other precedent that you're
following and pci_setup_device() is not?
> + vendor, device, subvendor, subdevice,
> + class, class_mask);
> +
> + rc = pci_add_dynid(&vfio_pci_driver, vendor, device,
> + subvendor, subdevice, class, class_mask, 0);
> + if (rc)
> + pr_warn("vfio-pci: failed to add dynamic id (%d)\n",
> + rc);
> + }
> +}
> +
> static int __init vfio_pci_init(void)
> {
> int ret;
> @@ -1053,6 +1097,8 @@ static int __init vfio_pci_init(void)
> if (ret)
> goto out_driver;
>
> + vfio_pci_fill_ids();
> +
> return 0;
>
> out_driver:
>
> --
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