drm/amdgpu: added support for psp fw attestation

loaded fw can be queried from sys fs interface

Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: John Clements <john.clements@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 142 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fw_attestation.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_fw_attestation.c
new file mode 100644
index 000000000000..c6947d6c7ff5
--- /dev/null
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fw_attestation.c
@@ -0,0 +1,142 @@
+/*
+ * Copyright 2020 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+#include <linux/debugfs.h>
+#include <linux/firmware.h>
+#include <linux/dma-mapping.h>
+
+#include "amdgpu.h"
+#include "amdgpu_psp.h"
+#include "amdgpu_ucode.h"
+#include "soc15_common.h"
+
+#define FW_ATTESTATION_DB_COOKIE        0x143b6a37
+#define FW_ATTESTATION_RECORD_VALID  	1
+#define FW_ATTESTATION_MAX_SIZE		4096
+
+typedef struct FW_ATT_DB_HEADER
+{
+	uint32_t AttDbVersion;           /* version of the fwar feature */
+	uint32_t AttDbCookie;            /* cookie as an extra check for corrupt data */
+} FW_ATT_DB_HEADER;
+
+typedef struct FW_ATT_RECORD
+{
+	uint16_t AttFwIdV1;              /* Legacy FW Type field */
+	uint16_t AttFwIdV2;              /* V2 FW ID field */
+	uint32_t AttFWVersion;           /* FW Version */
+	uint16_t AttFWActiveFunctionID;  /* The VF ID (only in VF Attestation Table) */
+	uint16_t AttSource;              /* FW source indicator */
+	uint16_t RecordValid;            /* Indicates whether the record is a valid entry */
+	uint8_t  AttFwTaId;              /* Ta ID (only in TA Attestation Table) */
+	uint8_t  Reserved;
+} FW_ATT_RECORD;
+
+static ssize_t amdgpu_fw_attestation_debugfs_read(struct file *f,
+						  char __user *buf,
+						  size_t size,
+						  loff_t *pos)
+{
+	struct amdgpu_device *adev = (struct amdgpu_device *)file_inode(f)->i_private;
+	uint64_t records_addr = 0;
+	uint64_t vram_pos = 0;
+	FW_ATT_DB_HEADER fw_att_hdr = {0};
+	FW_ATT_RECORD fw_att_record = {0};
+
+	if (size < sizeof(FW_ATT_RECORD)) {
+		DRM_WARN("FW attestation input buffer not enough memory");
+		return -EINVAL;
+	}
+
+	if ((*pos + sizeof(FW_ATT_DB_HEADER)) >= FW_ATTESTATION_MAX_SIZE) {
+		DRM_WARN("FW attestation out of bounds");
+		return 0;
+	}
+
+	if (psp_get_fw_attestation_records_addr(&adev->psp, &records_addr)) {
+		DRM_WARN("Failed to get FW attestation record address");
+		return -EINVAL;
+	}
+
+	vram_pos =  records_addr - adev->gmc.vram_start;
+
+	if (*pos == 0) {
+		amdgpu_device_vram_access(adev,
+					  vram_pos,
+					  (uint32_t*)&fw_att_hdr,
+					  sizeof(FW_ATT_DB_HEADER),
+					  false);
+
+		if (fw_att_hdr.AttDbCookie != FW_ATTESTATION_DB_COOKIE) {
+			DRM_WARN("Invalid FW attestation cookie");
+			return -EINVAL;
+		}
+
+		DRM_INFO("FW attestation version = 0x%X", fw_att_hdr.AttDbVersion);
+	}
+
+	amdgpu_device_vram_access(adev,
+				  vram_pos + sizeof(FW_ATT_DB_HEADER) + *pos,
+				  (uint32_t*)&fw_att_record,
+				  sizeof(FW_ATT_RECORD),
+				  false);
+
+	if (fw_att_record.RecordValid != FW_ATTESTATION_RECORD_VALID)
+		return 0;
+
+	if (copy_to_user(buf, (void*)&fw_att_record, sizeof(FW_ATT_RECORD)))
+		return -EINVAL;
+
+	*pos += sizeof(FW_ATT_RECORD);
+
+	return sizeof(FW_ATT_RECORD);
+}
+
+static const struct file_operations amdgpu_fw_attestation_debugfs_ops = {
+	.owner = THIS_MODULE,
+	.read = amdgpu_fw_attestation_debugfs_read,
+	.write = NULL,
+	.llseek = default_llseek
+};
+
+static int amdgpu_is_fw_attestation_supported(struct amdgpu_device *adev)
+{
+	if (adev->asic_type >= CHIP_SIENNA_CICHLID)
+		return 1;
+
+	return 0;
+}
+
+void amdgpu_fw_attestation_debugfs_init(struct amdgpu_device *adev)
+{
+#if defined(CONFIG_DEBUG_FS)
+	if (!amdgpu_is_fw_attestation_supported(adev))
+		return;
+
+	debugfs_create_file("amdgpu_fw_attestation",
+			    S_IRUSR,
+			    adev_to_drm(adev)->primary->debugfs_root,
+			    adev,
+			    &amdgpu_fw_attestation_debugfs_ops);
+#endif
+}
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