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From: Elliot Berman <quic_eberman@quicinc.com>
Date: Tue, 9 Jan 2024 11:37:43 -0800
Subject: [PATCH v16 05/34] virt: gunyah: Add hypervisor driver
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Message-ID: <20240109-gunyah-v16-5-634904bf4ce9@quicinc.com>
References: <20240109-gunyah-v16-0-634904bf4ce9@quicinc.com>
In-Reply-To: <20240109-gunyah-v16-0-634904bf4ce9@quicinc.com>
To: Alex Elder <elder@linaro.org>,
        Srinivas Kandagatla
	<srinivas.kandagatla@linaro.org>,
        Murali Nalajal <quic_mnalajal@quicinc.com>,
        Trilok Soni <quic_tsoni@quicinc.com>,
        Srivatsa Vaddagiri
	<quic_svaddagi@quicinc.com>,
        Carl van Schaik <quic_cvanscha@quicinc.com>,
        Philip Derrin <quic_pderrin@quicinc.com>,
        Prakruthi Deepak Heragu
	<quic_pheragu@quicinc.com>,
        Jonathan Corbet <corbet@lwn.net>, Rob Herring
	<robh+dt@kernel.org>,
        Krzysztof Kozlowski
	<krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>,
        Konrad Dybcio <konrad.dybcio@linaro.org>,
        Bjorn Andersson
	<andersson@kernel.org>,
        Dmitry Baryshkov <dmitry.baryshkov@linaro.org>,
        "Fuad
 Tabba" <tabba@google.com>,
        Sean Christopherson <seanjc@google.com>,
        "Andrew
 Morton" <akpm@linux-foundation.org>
CC: <linux-arm-msm@vger.kernel.org>, <linux-doc@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>, <devicetree@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>, <linux-mm@kvack.org>,
        Elliot Berman
	<quic_eberman@quicinc.com>

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@quicinc.com>
---
 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..ef8a85f27590
--- /dev/null
+++ b/drivers/virt/gunyah/gunyah.c
@@ -0,0 +1,52 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2023-2024 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");

-- 
2.34.1