Add driver to detect when running under Gunyah. It performs basic
identification hypercall and populates the platform bus for resource
manager to probe.
Signed-off-by: Elliot Berman <quic_eberman@xxxxxxxxxxx>
---
drivers/virt/Makefile | 1 +
drivers/virt/gunyah/Makefile | 3 +++
drivers/virt/gunyah/gunyah.c | 52 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 56 insertions(+)
diff --git a/drivers/virt/Makefile b/drivers/virt/Makefile
index f29901bd7820..ef6a3835d078 100644
--- a/drivers/virt/Makefile
+++ b/drivers/virt/Makefile
@@ -10,3 +10,4 @@ obj-y += vboxguest/
obj-$(CONFIG_NITRO_ENCLAVES) += nitro_enclaves/
obj-$(CONFIG_ACRN_HSM) += acrn/
obj-y += coco/
+obj-y += gunyah/
diff --git a/drivers/virt/gunyah/Makefile b/drivers/virt/gunyah/Makefile
new file mode 100644
index 000000000000..34f32110faf9
--- /dev/null
+++ b/drivers/virt/gunyah/Makefile
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0
+
+obj-$(CONFIG_GUNYAH) += gunyah.o
diff --git a/drivers/virt/gunyah/gunyah.c b/drivers/virt/gunyah/gunyah.c
new file mode 100644
index 000000000000..20bd6029ffc4
--- /dev/null
+++ b/drivers/virt/gunyah/gunyah.c
@@ -0,0 +1,52 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#include <linux/gunyah.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+
+static int gunyah_probe(struct platform_device *pdev)
+{
+ struct gunyah_hypercall_hyp_identify_resp gunyah_api;
+
+ if (!arch_is_gunyah_guest())
+ return -ENODEV;
+
+ gunyah_hypercall_hyp_identify(&gunyah_api);
+
+ pr_info("Running under Gunyah hypervisor %llx/v%u\n",
+ FIELD_GET(GUNYAH_API_INFO_VARIANT_MASK, gunyah_api.api_info),
+ gunyah_api_version(&gunyah_api));
+
+ /* Might move this out to individual drivers if there's ever an API version bump */
+ if (gunyah_api_version(&gunyah_api) != GUNYAH_API_V1) {
+ pr_info("Unsupported Gunyah version: %u\n",
+ gunyah_api_version(&gunyah_api));
+ return -ENODEV;
+ }
+
+ return devm_of_platform_populate(&pdev->dev);
+}
+
+static const struct of_device_id gunyah_of_match[] = {
+ { .compatible = "gunyah-hypervisor" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, gunyah_of_match);
+
+/* clang-format off */
+static struct platform_driver gunyah_driver = {
+ .probe = gunyah_probe,
+ .driver = {
+ .name = "gunyah",
+ .of_match_table = gunyah_of_match,
+ }
+};
+/* clang-format on */
+module_platform_driver(gunyah_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Gunyah Driver");
--
2.43.0
