Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / xen / xen-pciback / conf_space_quirks.c

diff --git a/kernel/drivers/xen/xen-pciback/conf_space_quirks.c b/kernel/drivers/xen/xen-pciback/conf_space_quirks.c
new file mode 100644 (file)
index 0000000..7476791
--- /dev/null
+++ b/kernel/drivers/xen/xen-pciback/conf_space_quirks.c
@@ -0,0 +1,139 @@
+/*
+ * PCI Backend - Handle special overlays for broken devices.
+ *
+ * Author: Ryan Wilson <hap9@epoch.ncsc.mil>
+ * Author: Chris Bookholt <hap10@epoch.ncsc.mil>
+ */
+
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include "pciback.h"
+#include "conf_space.h"
+#include "conf_space_quirks.h"
+
+LIST_HEAD(xen_pcibk_quirks);
+static inline const struct pci_device_id *
+match_one_device(const struct pci_device_id *id, const struct pci_dev *dev)
+{
+       if ((id->vendor == PCI_ANY_ID || id->vendor == dev->vendor) &&
+           (id->device == PCI_ANY_ID || id->device == dev->device) &&
+           (id->subvendor == PCI_ANY_ID ||
+                               id->subvendor == dev->subsystem_vendor) &&
+           (id->subdevice == PCI_ANY_ID ||
+                               id->subdevice == dev->subsystem_device) &&
+           !((id->class ^ dev->class) & id->class_mask))
+               return id;
+       return NULL;
+}
+
+static struct xen_pcibk_config_quirk *xen_pcibk_find_quirk(struct pci_dev *dev)
+{
+       struct xen_pcibk_config_quirk *tmp_quirk;
+
+       list_for_each_entry(tmp_quirk, &xen_pcibk_quirks, quirks_list)
+               if (match_one_device(&tmp_quirk->devid, dev) != NULL)
+                       goto out;
+       tmp_quirk = NULL;
+       printk(KERN_DEBUG DRV_NAME
+              ": quirk didn't match any device known\n");
+out:
+       return tmp_quirk;
+}
+
+static inline void register_quirk(struct xen_pcibk_config_quirk *quirk)
+{
+       list_add_tail(&quirk->quirks_list, &xen_pcibk_quirks);
+}
+
+int xen_pcibk_field_is_dup(struct pci_dev *dev, unsigned int reg)
+{
+       int ret = 0;
+       struct xen_pcibk_dev_data *dev_data = pci_get_drvdata(dev);
+       struct config_field_entry *cfg_entry;
+
+       list_for_each_entry(cfg_entry, &dev_data->config_fields, list) {
+               if (OFFSET(cfg_entry) == reg) {
+                       ret = 1;
+                       break;
+               }
+       }
+       return ret;
+}
+
+int xen_pcibk_config_quirks_add_field(struct pci_dev *dev, struct config_field
+                                   *field)
+{
+       int err = 0;
+
+       switch (field->size) {
+       case 1:
+               field->u.b.read = xen_pcibk_read_config_byte;
+               field->u.b.write = xen_pcibk_write_config_byte;
+               break;
+       case 2:
+               field->u.w.read = xen_pcibk_read_config_word;
+               field->u.w.write = xen_pcibk_write_config_word;
+               break;
+       case 4:
+               field->u.dw.read = xen_pcibk_read_config_dword;
+               field->u.dw.write = xen_pcibk_write_config_dword;
+               break;
+       default:
+               err = -EINVAL;
+               goto out;
+       }
+
+       xen_pcibk_config_add_field(dev, field);
+
+out:
+       return err;
+}
+
+int xen_pcibk_config_quirks_init(struct pci_dev *dev)
+{
+       struct xen_pcibk_config_quirk *quirk;
+       int ret = 0;
+
+       quirk = kzalloc(sizeof(*quirk), GFP_ATOMIC);
+       if (!quirk) {
+               ret = -ENOMEM;
+               goto out;
+       }
+
+       quirk->devid.vendor = dev->vendor;
+       quirk->devid.device = dev->device;
+       quirk->devid.subvendor = dev->subsystem_vendor;
+       quirk->devid.subdevice = dev->subsystem_device;
+       quirk->devid.class = 0;
+       quirk->devid.class_mask = 0;
+       quirk->devid.driver_data = 0UL;
+
+       quirk->pdev = dev;
+
+       register_quirk(quirk);
+out:
+       return ret;
+}
+
+void xen_pcibk_config_field_free(struct config_field *field)
+{
+       kfree(field);
+}
+
+int xen_pcibk_config_quirk_release(struct pci_dev *dev)
+{
+       struct xen_pcibk_config_quirk *quirk;
+       int ret = 0;
+
+       quirk = xen_pcibk_find_quirk(dev);
+       if (!quirk) {
+               ret = -ENXIO;
+               goto out;
+       }
+
+       list_del(&quirk->quirks_list);
+       kfree(quirk);
+
+out:
+       return ret;
+}