Add pci_device_has_non_null_driver().

This helps enable FreeBSD, where pciaccess pci_device_has_kernel_driver()
is not functional.  The function will return 0 if there is no driver
attached, or the Linux uio or FreeBSD nic_uio driver is attached.  It will
return 1 otherwise.

Signed-off-by: Jim Harris <james.r.harris@intel.com>
Change-Id: I0921e61c9040b1e0411b5dc40b36fc7f2721c8c5

examples/nvme/identify/identify.c

@@ -467,9 +467,8 @@ int main(int argc, char **argv)
 	while ((pci_dev = pci_device_next(pci_dev_iter))) {
 		struct nvme_controller *ctrlr;
 
-		if (pci_device_has_kernel_driver(pci_dev) &&
+		if (pci_device_has_non_null_driver(pci_dev)) {
-		    !pci_device_has_uio_driver(pci_dev)) {
+			fprintf(stderr, "non-null kernel driver attached to nvme\n");
-			fprintf(stderr, "non-uio kernel driver attached to nvme\n");
 			fprintf(stderr, " controller at pci bdf %d:%d:%d\n",
 				pci_dev->bus, pci_dev->dev, pci_dev->func);
 			fprintf(stderr, " skipping...\n");

examples/nvme/perf/perf.c

@@ -432,9 +432,8 @@ register_controllers(void)
 	while ((pci_dev = pci_device_next(pci_dev_iter))) {
 		struct nvme_controller *ctrlr;
 
-		if (pci_device_has_kernel_driver(pci_dev) &&
+		if (pci_device_has_non_null_driver(pci_dev)) {
-		    !pci_device_has_uio_driver(pci_dev)) {
+			fprintf(stderr, "non-null kernel driver attached to nvme\n");
-			fprintf(stderr, "non-uio kernel driver attached to nvme\n");
 			fprintf(stderr, " controller at pci bdf %d:%d:%d\n",
 				pci_dev->bus, pci_dev->dev, pci_dev->func);
 			fprintf(stderr, " skipping...\n");

include/spdk/pci.h

@@ -40,6 +40,7 @@
 
 int pci_device_get_serial_number(struct pci_device *dev, char *sn, int len);
 int pci_device_has_uio_driver(struct pci_device *dev);
+int pci_device_has_non_null_driver(struct pci_device *dev);
 int pci_device_unbind_kernel_driver(struct pci_device *dev);
 int pci_device_bind_uio_driver(struct pci_device *dev, char *driver_name);
 int pci_device_switch_to_uio_driver(struct pci_device *pci_dev);

lib/util/pci.c

@@ -43,6 +43,10 @@
 
 #include <pciaccess.h>
 
+#ifdef __FreeBSD__
+#include <sys/pciio.h>
+#endif
+
 #include "spdk/pci.h"
 
 #define SYSFS_PCI_DEVICES	"/sys/bus/pci/devices"
@@ -126,6 +130,65 @@ pci_device_has_uio_driver(struct pci_device *dev)
 	return 1;
 }
 
+#ifdef __FreeBSD__
+int
+pci_device_has_non_null_driver(struct pci_device *dev)
+{
+	struct pci_conf_io	configsel;
+	struct pci_match_conf	pattern;
+	struct pci_conf		conf;
+	int			fd;
+
+	memset(&pattern, 0, sizeof(pattern));
+	pattern.pc_sel.pc_domain = dev->domain;
+	pattern.pc_sel.pc_bus = dev->bus;
+	pattern.pc_sel.pc_dev = dev->dev;
+	pattern.pc_sel.pc_func = dev->func;
+	pattern.flags = PCI_GETCONF_MATCH_DOMAIN |
+			PCI_GETCONF_MATCH_BUS |
+			PCI_GETCONF_MATCH_DEV |
+			PCI_GETCONF_MATCH_FUNC;
+
+	memset(&configsel, 0, sizeof(configsel));
+	configsel.match_buf_len = sizeof(conf);
+	configsel.matches = &conf;
+	configsel.num_patterns = 1;
+	configsel.pat_buf_len = sizeof(pattern);
+	configsel.patterns = &pattern;
+
+	fd = open("/dev/pci", O_RDONLY, 0);
+	if (fd < 0) {
+		fprintf(stderr, "could not open /dev/pci\n");
+		return -1;
+	}
+
+	if (ioctl(fd, PCIOCGETCONF, &configsel) == -1) {
+		fprintf(stderr, "ioctl(PCIOCGETCONF) failed\n");
+		close(fd);
+		return -1;
+	}
+
+	close(fd);
+
+	if (configsel.num_matches != 1) {
+		fprintf(stderr, "could not find specified device\n");
+		return -1;
+	}
+
+	if (conf.pd_name[0] == '\0' || !strcmp(conf.pd_name, "nic_uio")) {
+		return 0;
+	} else {
+		return 1;
+	}
+}
+#else
+int
+pci_device_has_non_null_driver(struct pci_device *dev)
+{
+	return pci_device_has_kernel_driver(dev) && !pci_device_has_uio_driver(dev);
+}
+#endif
+
 int
 pci_device_unbind_kernel_driver(struct pci_device *dev)
 {

test/lib/nvme/aer/aer.c

@@ -225,9 +225,8 @@ int main(int argc, char **argv)
 	while ((pci_dev = pci_device_next(pci_dev_iter))) {
 		struct dev *dev;
 
-		if (pci_device_has_kernel_driver(pci_dev) &&
+		if (pci_device_has_non_null_driver(pci_dev)) {
-		    !pci_device_has_uio_driver(pci_dev)) {
+			fprintf(stderr, "non-null kernel driver attached to nvme\n");
-			fprintf(stderr, "non-uio kernel driver attached to nvme\n");
 			fprintf(stderr, " controller at pci bdf %d:%d:%d\n",
 				pci_dev->bus, pci_dev->dev, pci_dev->func);
 			fprintf(stderr, " skipping...\n");