Implement pci_find_class(9), the function to find a pci device by its class.

Sponsored by:	The FreeBSD Foundation
Reviewed by:	jhb
MFC after:	1 week

2 files changed, 16 insertions, 0 deletions

diff --git a/sys/dev/pci/pci.c b/sys/dev/pci/pci.c
index b346dd3..004190a 100644
--- a/sys/dev/pci/pci.c
+++ b/sys/dev/pci/pci.c
@@ -347,6 +347,21 @@ pci_find_device(uint16_t vendor, uint16_t device)
 	return (NULL);
 }
 
+device_t
+pci_find_class(uint8_t class, uint8_t subclass)
+{
+	struct pci_devinfo *dinfo;
+
+	STAILQ_FOREACH(dinfo, &pci_devq, pci_links) {
+		if (dinfo->cfg.baseclass == class &&
+		    dinfo->cfg.subclass == subclass) {
+			return (dinfo->cfg.dev);
+		}
+	}
+
+	return (NULL);
+}
+
 static int
 pci_printf(pcicfgregs *cfg, const char *fmt, ...)
 {
diff --git a/sys/dev/pci/pcivar.h b/sys/dev/pci/pcivar.h
index ae3fe79..8fd84a7 100644
--- a/sys/dev/pci/pcivar.h
+++ b/sys/dev/pci/pcivar.h
@@ -457,6 +457,7 @@ pci_msix_count(device_t dev)
 device_t pci_find_bsf(uint8_t, uint8_t, uint8_t);
 device_t pci_find_dbsf(uint32_t, uint8_t, uint8_t, uint8_t);
 device_t pci_find_device(uint16_t, uint16_t);
+device_t pci_find_class(uint8_t class, uint8_t subclass);
 
 /* Can be used by drivers to manage the MSI-X table. */
 int	pci_pending_msix(device_t dev, u_int index);