Add NVIDIA NBCI object dumping driver

coreboot-collector-nvidia/Makefile

@@ -0,0 +1,8 @@
+obj-m := coreboot-collector-nvidia.o
+KERNEL_DIR = /lib/modules/$(shell uname -r)/build
+
+all:
+	$(MAKE) -C "$(KERNEL_DIR)" M="$(PWD)" modules
+
+clean:
+	$(MAKE) -C "$(KERNEL_DIR)" M="$(PWD)" clean

coreboot-collector-nvidia/coreboot-collector-nvidia.c

@@ -0,0 +1,163 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * System76 ACPI Driver
+ *
+ * Copyright (C) 2019 System76
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/acpi.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/types.h>
+
+static union acpi_object * dump_object(union acpi_object * obj) {
+	int i;
+	switch (obj->type) {
+		case ACPI_TYPE_INTEGER:
+			pr_info("Integer: 0x%llx\n", obj->integer.value);
+			break;
+		case ACPI_TYPE_STRING:
+			pr_info("String: '%s'\n", obj->string.pointer);
+			break;
+		case ACPI_TYPE_BUFFER:
+			pr_info("Buffer (0x%x) {", obj->buffer.length);
+			for (i = 0; i < obj->buffer.length; i++) {
+				if (i > 0) {
+					pr_cont(",");
+				}
+				if ((i % 8) == 0) {
+					pr_cont("\n");
+					pr_info(" ");
+				}
+				pr_cont(" 0x%02X", obj->buffer.pointer[i]);
+			}
+			pr_cont("\n");
+			pr_info("}\n");
+			break;
+		default:
+			pr_info("Unsupported type: 0x%x\n", obj->type);
+			break;
+	}
+	return obj;
+}
+
+static union acpi_object * nvidia_dsm(acpi_handle handle, const guid_t * guid, u64 rev, u64 func, char arg[4]) {
+	union acpi_object argv4 = {
+		.buffer.type = ACPI_TYPE_BUFFER,
+		.buffer.length = 4,
+		.buffer.pointer = arg
+	};
+	return acpi_evaluate_dsm(
+		handle,
+		guid,
+		rev,
+		func,
+		&argv4
+	);
+}
+
+static const guid_t NBCI_DSM_GUID = GUID_INIT(
+	0xD4A50B75, 0x65C7, 0x46F7, 0xBF, 0xB7, 0x41, 0x51, 0x4C, 0xEA, 0x02, 0x44
+);
+#define NBCI_REVISION_ID 0x0102
+#define NBCI_FUNC_SUPPORT 0
+#define NBCI_FUNC_GETOBJBYTYPE 16
+static union acpi_object * nbci(acpi_handle handle, u64 func, char arg[4]) {
+	return nvidia_dsm(
+		handle,
+		&NBCI_DSM_GUID,
+		NBCI_REVISION_ID,
+		func, 
+		arg
+	);
+}
+
+static void cbcnv_handle(acpi_handle handle) {
+	union acpi_object *obj = NULL;
+	char arg[4] = { 0, 0, 0, 0 };
+
+	pr_info("coreboot-collector-nvidia handle %p\n", handle);
+
+	pr_info("NBCI_FUNC_SUPPORT\n");
+	obj = nbci(handle, NBCI_FUNC_SUPPORT, arg);
+	if (obj) {
+		ACPI_FREE(dump_object(obj));
+		obj = NULL;
+	} else {
+		acpi_handle_info(handle, "failed to execute\n");
+	}
+
+	arg[0] = 0;
+	arg[1] = 0;
+	arg[2] = 'R';
+	arg[3] = 'D';
+	pr_info("NBCI_FUNC_GETOBJBYTYPE '%c%c'\n", arg[3], arg[2]);
+	obj = nbci(handle, NBCI_FUNC_GETOBJBYTYPE, arg);
+	if (obj) {
+		ACPI_FREE(dump_object(obj));
+		obj = NULL;
+	} else {
+		acpi_handle_info(handle, "failed to execute\n");
+	}
+
+	arg[0] = 0;
+	arg[1] = 0;
+	arg[2] = 'K';
+	arg[3] = 'V';
+	pr_info("NBCI_FUNC_GETOBJBYTYPE '%c%c'\n", arg[3], arg[2]);
+	obj = nbci(handle, NBCI_FUNC_GETOBJBYTYPE, arg);
+	if (obj) {
+		ACPI_FREE(dump_object(obj));
+		obj = NULL;
+	} else {
+		acpi_handle_info(handle, "failed to execute\n");
+	}
+}
+
+static int __init cbcnv_init(void) {
+    struct pci_dev *pdev = NULL;
+	acpi_handle handle;
+
+	pr_info("coreboot-collector-nvidia init\n");
+
+    while ((pdev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, pdev)) != NULL) {
+        int pci_class = pdev->class >> 8;
+        if (pci_class != PCI_CLASS_DISPLAY_VGA
+		 && pci_class != PCI_CLASS_DISPLAY_3D) {
+            continue;
+		}
+
+		if (pdev->vendor != PCI_VENDOR_ID_NVIDIA) {
+			continue;
+		}
+
+		pr_info("NVIDIA GPU at '%s'\n", dev_name(&pdev->dev));
+
+        handle = ACPI_HANDLE(&pdev->dev);
+		if (!handle) {
+			pr_err("failed to find ACPI handle\n");
+			continue;
+		}
+
+		cbcnv_handle(handle);
+	}
+
+	return 0;
+}
+
+static void __exit cbcnv_exit(void) {
+	pr_info("coreboot-collector-nvidia exit\n");
+}
+
+module_init(cbcnv_init);
+module_exit(cbcnv_exit);
+
+MODULE_DESCRIPTION("Coreboot Collector NVIDIA");
+MODULE_AUTHOR("Jeremy Soller <[email protected]>");
+MODULE_LICENSE("GPL");

coreboot-collector-nvidia/run.sh

@@ -0,0 +1 @@
+sudo rmmod coreboot_collector_nvidia; make && sudo insmod coreboot-collector-nvidia.ko && dmesg -w