bootstd: Scan all bootdevs in a boot_targets entry (take 2)

When the boot_targets environment variable is used with the distro-boot
scripts, each device is included individually. For example, if there
are three mmc devices, then we will have something like:

   boot_targets="mmc0 mmc1 mmc2"

In contrast, standard boot supports specifying just the uclass, i.e.:

   boot_targets="mmc"

The intention is that this should scan all MMC devices, but in fact it
currently only scans the first.

Update the logic to handle this case, without required BOOTSTD_FULL to
be enabled.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reported-by: Date Huang <tjjh89017@hotmail.com>
Reported-by: Vincent Stehlé <vincent.stehle@arm.com>
Reported-by: Ivan Ivanov <ivan.ivanov@suse.com>
Tested-by: Ivan T.Ivanov <iivanov@suse.de>

3 files changed, 52 insertions, 5 deletions

diff --git a/boot/bootdev-uclass.c b/boot/bootdev-uclass.c
index 974ddee5d2f..44ae98a9269 100644
--- a/boot/bootdev-uclass.c
+++ b/boot/bootdev-uclass.c
@@ -469,10 +469,11 @@ int bootdev_find_by_label(const char *label, struct udevice **devp,
 			 * if no sequence number was provided, we must scan all
 			 * bootdevs for this media uclass
 			 */
-			if (IS_ENABLED(CONFIG_BOOTSTD_FULL) && seq == -1)
+			if (seq == -1)
 				method_flags |= BOOTFLOW_METHF_SINGLE_UCLASS;
 			if (method_flagsp)
 				*method_flagsp = method_flags;
+			log_debug("method flags %x\n", method_flags);
 			return 0;
 		}
 		log_debug("- no device in %s\n", media->name);
diff --git a/boot/bootflow.c b/boot/bootflow.c
index 7f5b0e94207..be543c8588c 100644
--- a/boot/bootflow.c
+++ b/boot/bootflow.c
@@ -280,8 +280,26 @@ static int iter_incr(struct bootflow_iter *iter)
 		} else {
 			log_debug("labels %p\n", iter->labels);
 			if (iter->labels) {
-				ret = bootdev_next_label(iter, &dev,
-							 &method_flags);
+				/*
+				 * when the label is "mmc" we want to scan all
+				 * mmc bootdevs, not just the first. See
+				 * bootdev_find_by_label() where this flag is
+				 * set up
+				 */
+				if (iter->method_flags &
+				    BOOTFLOW_METHF_SINGLE_UCLASS) {
+					scan_next_in_uclass(&dev);
+					log_debug("looking for next device %s: %s\n",
+						  iter->dev->name,
+						  dev ? dev->name : "<none>");
+				} else {
+					dev = NULL;
+				}
+				if (!dev) {
+					log_debug("looking at next label\n");
+					ret = bootdev_next_label(iter, &dev,
+								 &method_flags);
+				}
 			} else {
 				ret = bootdev_next_prio(iter, &dev);
 				method_flags = 0;
diff --git a/test/boot/bootdev.c b/test/boot/bootdev.c
index 63786174805..0702fccdae6 100644
--- a/test/boot/bootdev.c
+++ b/test/boot/bootdev.c
@@ -225,7 +225,7 @@ static int bootdev_test_order(struct unit_test_state *uts)
 	ut_assertok(env_set("boot_targets", "mmc1 mmc2 usb"));
 	ut_assertok(bootflow_scan_first(NULL, NULL, &iter, 0, &bflow));
 	ut_asserteq(-ENODEV, bootflow_scan_next(&iter, &bflow));
-	ut_asserteq(3, iter.num_devs);
+	ut_asserteq(5, iter.num_devs);
 	ut_asserteq_str("mmc1.bootdev", iter.dev_used[0]->name);
 	ut_asserteq_str("mmc2.bootdev", iter.dev_used[1]->name);
 	ut_asserteq_str("usb_mass_storage.lun0.bootdev",
@@ -237,7 +237,20 @@ static int bootdev_test_order(struct unit_test_state *uts)
 	ut_assertok(bootflow_scan_first(NULL, "mmc", &iter, 0, &bflow));
 	ut_asserteq(2, iter.num_devs);
 
-	/* Now scan pass mmc1 and make sure that only mmc0 shows up */
+	/* Now scan past mmc1 and make sure that only mmc0 shows up */
+	ut_asserteq(-ENODEV, bootflow_scan_next(&iter, &bflow));
+	ut_asserteq(3, iter.num_devs);
+	ut_asserteq_str("mmc2.bootdev", iter.dev_used[0]->name);
+	ut_asserteq_str("mmc1.bootdev", iter.dev_used[1]->name);
+	ut_asserteq_str("mmc0.bootdev", iter.dev_used[2]->name);
+	bootflow_iter_uninit(&iter);
+
+	/* Try a single uclass with boot_targets */
+	ut_assertok(env_set("boot_targets", "mmc"));
+	ut_assertok(bootflow_scan_first(NULL, NULL, &iter, 0, &bflow));
+	ut_asserteq(2, iter.num_devs);
+
+	/* Now scan past mmc1 and make sure that only mmc0 shows up */
 	ut_asserteq(-ENODEV, bootflow_scan_next(&iter, &bflow));
 	ut_asserteq(3, iter.num_devs);
 	ut_asserteq_str("mmc2.bootdev", iter.dev_used[0]->name);
@@ -245,6 +258,21 @@ static int bootdev_test_order(struct unit_test_state *uts)
 	ut_asserteq_str("mmc0.bootdev", iter.dev_used[2]->name);
 	bootflow_iter_uninit(&iter);
 
+	/* Try a single uclass with boot_targets */
+	ut_assertok(env_set("boot_targets", "mmc usb"));
+	ut_assertok(bootflow_scan_first(NULL, NULL, &iter, 0, &bflow));
+	ut_asserteq(2, iter.num_devs);
+
+	/* Now scan past mmc1 and make sure that the 3 USB devices show up */
+	ut_asserteq(-ENODEV, bootflow_scan_next(&iter, &bflow));
+	ut_asserteq(6, iter.num_devs);
+	ut_asserteq_str("mmc2.bootdev", iter.dev_used[0]->name);
+	ut_asserteq_str("mmc1.bootdev", iter.dev_used[1]->name);
+	ut_asserteq_str("mmc0.bootdev", iter.dev_used[2]->name);
+	ut_asserteq_str("usb_mass_storage.lun0.bootdev",
+			iter.dev_used[3]->name);
+	bootflow_iter_uninit(&iter);
+
 	return 0;
 }
 BOOTSTD_TEST(bootdev_test_order, UT_TESTF_DM | UT_TESTF_SCAN_FDT);