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| author | Alex Williamson <alex.williamson@redhat.com> | 2015-04-07 11:14:43 -0600 |
|---|---|---|
| committer | Alex Williamson <alex.williamson@redhat.com> | 2015-04-07 11:14:43 -0600 |
| commit | 80c7e8cc2aaa36944acdfbce46f373101b9f21ff (patch) | |
| tree | 4e0703332bd19c261fed8e44f61172ffee9b065b /drivers/vfio/pci | |
| parent | ecaa1f6a01544604de5f9531379a303eee886162 (diff) | |
| download | linux-80c7e8cc2aaa36944acdfbce46f373101b9f21ff.tar.bz2 | |
vfio-pci: Allow PCI IDs to be specified as module options
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@redhat.com>
Diffstat (limited to 'drivers/vfio/pci')
| -rw-r--r-- | drivers/vfio/pci/vfio_pci.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c index 25aef05b8692..43517ce930f2 100644 --- a/drivers/vfio/pci/vfio_pci.c +++ b/drivers/vfio/pci/vfio_pci.c @@ -11,6 +11,8 @@ * Author: Tom Lyon, pugs@cisco.com */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + #include <linux/device.h> #include <linux/eventfd.h> #include <linux/file.h> @@ -33,6 +35,10 @@ #define DRIVER_AUTHOR "Alex Williamson <alex.williamson@redhat.com>" #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, @@ -1105,6 +1111,47 @@ 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("invalid id string \"%s\"\n", id); + continue; + } + + rc = pci_add_dynid(&vfio_pci_driver, vendor, device, + subvendor, subdevice, class, class_mask, 0); + if (rc) + pr_warn("failed to add dynamic id [%04hx:%04hx[%04hx:%04hx]] class %#08x/%08x (%d)\n", + vendor, device, subvendor, subdevice, + class, class_mask, rc); + else + pr_info("add [%04hx:%04hx[%04hx:%04hx]] class %#08x/%08x\n", + vendor, device, subvendor, subdevice, + class, class_mask); + } +} + static int __init vfio_pci_init(void) { int ret; @@ -1119,6 +1166,8 @@ static int __init vfio_pci_init(void) if (ret) goto out_driver; + vfio_pci_fill_ids(); + return 0; out_driver: |