@@ -1 +1,2 @@
pcitest-y += pcitest.o
+doetest-y += doetest.o
@@ -14,7 +14,7 @@ MAKEFLAGS += -r
CFLAGS += -O2 -Wall -g -D_GNU_SOURCE -I$(OUTPUT)include
-ALL_TARGETS := pcitest
+ALL_TARGETS := pcitest doetest
ALL_PROGRAMS := $(patsubst %,$(OUTPUT)%,$(ALL_TARGETS))
SCRIPTS := pcitest.sh
@@ -30,6 +30,7 @@ include $(srctree)/tools/build/Makefile.include
$(OUTPUT)include/linux/: ../../include/uapi/linux/
mkdir -p $(OUTPUT)include/linux/ 2>&1 || true
ln -sf $(CURDIR)/../../include/uapi/linux/pcitest.h $@
+ ln -sf $(CURDIR)/../../include/uapi/linux/pci_doe.h $@
prepare: $(OUTPUT)include/linux/
@@ -39,6 +40,12 @@ $(PCITEST_IN): prepare FORCE
$(OUTPUT)pcitest: $(PCITEST_IN)
$(QUIET_LINK)$(CC) $(CFLAGS) $(LDFLAGS) $< -o $@
+DOETEST_IN := $(OUTPUT)doetest-in.o
+$(DOETEST_IN): prepare FORCE
+ $(Q)$(MAKE) $(build)=doetest
+$(OUTPUT)doetest: $(DOETEST_IN)
+ $(QUIET_LINK)$(CC) $(CFLAGS) $(LDFLAGS) $< -o $@
+
clean:
rm -f $(ALL_PROGRAMS)
rm -rf $(OUTPUT)include/
new file mode 100644
@@ -0,0 +1,131 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Example user of the DOE userspace interface.
+ *
+ * Jonathan Cameron <Jonathan.Cameron@huawei.com>
+ */
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <fcntl.h>
+#include <linux/types.h>
+#include <stdio.h>
+#include <sys/ioctl.h>
+#include <getopt.h>
+#include <string.h>
+
+struct pci_doe_uexchange {
+ __u16 vid;
+ __u8 protocol;
+ __u8 rsvd;
+ __u32 retval;
+ struct {
+ __s32 size;
+ __u32 rsvd;
+ __u64 payload;
+ } in;
+ struct {
+ __s32 size;
+ __u32 rsvd;
+ __u64 payload;
+ } out;
+};
+
+#define PCI_DOE_EXCHANGE _IOWR(0xDA, 1, struct pci_doe_uexchange)
+
+int doe_list_protocols(int fd)
+{
+ __u32 outbuf = 0;
+ __u32 inbuf; /* Start with index 0 */
+ struct pci_doe_uexchange ex = {
+ .vid = 33,
+ .protocol = 1,
+ .in.size = sizeof(inbuf),
+ .in.payload = (__u64)&inbuf,
+ .out.size = sizeof(outbuf),
+ .out.payload = (__u64)&outbuf,
+ .vid = 0x01, /* PCI SIG */
+ .protocol = 0x00,
+ };
+ int rc;
+ uint8_t index = 0;
+
+ do {
+ inbuf = index;
+ rc = ioctl(fd, PCI_DOE_EXCHANGE, &ex);
+ if (rc) {
+ printf("IOCTL error: %d\n", rc);
+ return rc;
+ }
+ if (ex.retval) {
+ printf("DOE return value indicates failure: %d\n", ex.retval);
+ return ex.retval;
+ }
+ index = outbuf >> 24;
+
+ printf("VID: %#x, Protocol: %#x\n", outbuf & 0xffff, (outbuf >> 16) & 0xff);
+ } while (index);
+
+ return 0;
+}
+
+static const struct option longopts[] = {
+ { "filename", 1, 0, 'f' },
+ { }
+};
+
+static void print_usage(void)
+{
+ fprintf(stderr, "Usage: doe [options]...\n"
+ "Example userspace access to a PCI DOE mailbox\n"
+ " -f <filename> Path to chardev /dev/pcidoe/...\n"
+ " -l List supported protocols\n");
+}
+
+int main(int argc, char **argv)
+{
+ char *filename = NULL;
+ bool run_discovery = false;
+ int fd, c;
+ int rc = 0;
+
+ while ((c = getopt_long(argc, argv, "?f:l", longopts, NULL)) != -1) {
+ switch (c) {
+ case 'f':
+ filename = strdup(optarg);
+ break;
+ case 'l':
+ run_discovery = true;
+ break;
+ case '?':
+ print_usage();
+ goto free_filename;
+ }
+ }
+ if (!filename) {
+ fprintf(stderr, "Filename must be supplied using -f FILENAME\n");
+ rc = -1;
+ /* No need to actually free the filename, but keep exit path simple */
+ goto free_filename;
+ }
+
+ fd = open(filename, 0);
+ if (fd == -1) {
+ fprintf(stderr, "Could not open file %s\n", filename);
+ rc = -1;
+ goto free_filename;
+ }
+ if (run_discovery) {
+ rc = doe_list_protocols(fd);
+ if (rc)
+ goto close_fd;
+ }
+close_fd:
+ close(fd);
+free_filename:
+ free(filename);
+
+ return rc;
+}
The example uses the Discovery Protocol to illustrate the use of the IOCTL interface to access the DOE mailboxes form userspace. Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> --- tools/pci/Build | 1 + tools/pci/Makefile | 9 ++- tools/pci/doetest.c | 131 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 140 insertions(+), 1 deletion(-) -- 2.19.1