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>

drivers/gpu/drm/amd/amdgpu/Makefile

@@ -55,7 +55,8 @@ amdgpu-y += amdgpu_device.o amdgpu_kms.o \
 	amdgpu_vf_error.o amdgpu_sched.o amdgpu_debugfs.o amdgpu_ids.o \
 	amdgpu_gmc.o amdgpu_mmhub.o amdgpu_xgmi.o amdgpu_csa.o amdgpu_ras.o amdgpu_vm_cpu.o \
 	amdgpu_vm_sdma.o amdgpu_discovery.o amdgpu_ras_eeprom.o amdgpu_nbio.o \
-	amdgpu_umc.o smu_v11_0_i2c.o amdgpu_fru_eeprom.o amdgpu_rap.o
+	amdgpu_umc.o smu_v11_0_i2c.o amdgpu_fru_eeprom.o amdgpu_rap.o \
+	amdgpu_fw_attestation.o
 
 amdgpu-$(CONFIG_PERF_EVENTS) += amdgpu_pmu.o
 

drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c

@@ -35,6 +35,7 @@
 #include "amdgpu_dm_debugfs.h"
 #include "amdgpu_ras.h"
 #include "amdgpu_rap.h"
+#include "amdgpu_fw_attestation.h"
 
 /**
  * amdgpu_debugfs_add_files - Add simple debugfs entries
@@ -1665,6 +1666,8 @@ int amdgpu_debugfs_init(struct amdgpu_device *adev)
 
 	amdgpu_rap_debugfs_init(adev);
 
+	amdgpu_fw_attestation_debugfs_init(adev);
+
 	return amdgpu_debugfs_add_files(adev, amdgpu_debugfs_list,
 					ARRAY_SIZE(amdgpu_debugfs_list));
 }

drivers/gpu/drm/amd/amdgpu/amdgpu_fw_attestation.c

+/*
+ * 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
+}
\ No newline at end of file

drivers/gpu/drm/amd/amdgpu/amdgpu_fw_attestation.h

+/*
+ * 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.
+ *
+ *
+ */
+#ifndef _AMDGPU_FW_ATTESTATION_H
+#define _AMDGPU_FW_ATTESTATION_H
+
+#include "amdgpu.h"
+
+void amdgpu_fw_attestation_debugfs_init(struct amdgpu_device *adev);
+#endif

drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c

@@ -290,6 +290,8 @@ psp_cmd_submit_buf(struct psp_context *psp,
 	skip_unsupport = (psp->cmd_buf_mem->resp.status == TEE_ERROR_NOT_SUPPORTED ||
 		psp->cmd_buf_mem->resp.status == PSP_ERR_UNKNOWN_COMMAND) && amdgpu_sriov_vf(psp->adev);
 
+	memcpy((void*)&cmd->resp, (void*)&psp->cmd_buf_mem->resp, sizeof(struct psp_gfx_resp));
+
 	/* In some cases, psp response status is not 0 even there is no
 	 * problem while the command is submitted. Some version of PSP FW
 	 * doesn't write 0 to that field.
@@ -310,9 +312,6 @@ psp_cmd_submit_buf(struct psp_context *psp,
 		}
 	}
 
-	/* get xGMI session id from response buffer */
-	cmd->resp.session_id = psp->cmd_buf_mem->resp.session_id;
-
 	if (ucode) {
 		ucode->tmr_mc_addr_lo = psp->cmd_buf_mem->resp.fw_addr_lo;
 		ucode->tmr_mc_addr_hi = psp->cmd_buf_mem->resp.fw_addr_hi;
@@ -511,6 +510,37 @@ static int psp_tmr_terminate(struct psp_context *psp)
 	return 0;
 }
 
+int psp_get_fw_attestation_records_addr(struct psp_context *psp,
+					uint64_t *output_ptr)
+{
+	int ret;
+	struct psp_gfx_cmd_resp *cmd;
+
+	if (!output_ptr)
+		return -EINVAL;
+
+	if (amdgpu_sriov_vf(psp->adev))
+		return 0;
+
+	cmd = kzalloc(sizeof(struct psp_gfx_cmd_resp), GFP_KERNEL);
+	if (!cmd)
+		return -ENOMEM;
+
+	cmd->cmd_id = GFX_CMD_ID_GET_FW_ATTESTATION;
+
+	ret = psp_cmd_submit_buf(psp, NULL, cmd,
+				 psp->fence_buf_mc_addr);
+
+	if (!ret) {
+		*output_ptr = ((uint64_t)cmd->resp.uresp.fwar_db_info.fwar_db_addr_lo) +
+			      ((uint64_t)cmd->resp.uresp.fwar_db_info.fwar_db_addr_hi << 32);
+	}
+
+	kfree(cmd);
+
+	return ret;
+}
+
 static void psp_prep_asd_load_cmd_buf(struct psp_gfx_cmd_resp *cmd,
 				uint64_t asd_mc, uint32_t size)
 {

drivers/gpu/drm/amd/amdgpu/amdgpu_psp.h

@@ -398,4 +398,6 @@ int psp_init_sos_microcode(struct psp_context *psp,
 			   const char *chip_name);
 int psp_init_ta_microcode(struct psp_context *psp,
 			  const char *chip_name);
+int psp_get_fw_attestation_records_addr(struct psp_context *psp,
+					uint64_t *output_ptr);
 #endif

drivers/gpu/drm/amd/amdgpu/psp_gfx_if.h

@@ -98,6 +98,7 @@ enum psp_gfx_cmd_id
     GFX_CMD_ID_DESTROY_VMR        = 0x0000000A,   /* destroy VMR region */
     GFX_CMD_ID_PROG_REG           = 0x0000000B,   /* program regs */
     GFX_CMD_ID_CLEAR_VF_FW        = 0x0000000D,   /* Clear VF FW, to be used on VF shutdown. */
+    GFX_CMD_ID_GET_FW_ATTESTATION = 0x0000000F,   /* Query GPUVA of the Fw Attestation DB */
     /* IDs upto 0x1F are reserved for older programs (Raven, Vega 10/12/20) */
     GFX_CMD_ID_LOAD_TOC           = 0x00000020,   /* Load TOC and obtain TMR size */
     GFX_CMD_ID_AUTOLOAD_RLC       = 0x00000021,   /* Indicates all graphics fw loaded, start RLC autoload */
@@ -285,6 +286,25 @@ union psp_gfx_commands
     struct psp_gfx_cmd_load_toc         cmd_load_toc;
 };
 
+struct psp_gfx_uresp_reserved
+{
+    uint32_t reserved[8];
+};
+
+/* Command-specific response for Fw Attestation Db */
+struct psp_gfx_uresp_fwar_db_info
+{
+    uint32_t fwar_db_addr_lo;
+    uint32_t fwar_db_addr_hi;
+};
+
+/* Union of command-specific responses for GPCOM ring. */
+union psp_gfx_uresp
+{
+    struct psp_gfx_uresp_reserved reserved;
+    struct psp_gfx_uresp_fwar_db_info fwar_db_info;
+};
+
 /* Structure of GFX Response buffer.
 * For GPCOM I/F it is part of GFX_CMD_RESP buffer, for RBI
 * it is separate buffer.
@@ -297,9 +317,11 @@ struct psp_gfx_resp
     uint32_t	fw_addr_hi;	/* +12 bits [63:32] of FW address within TMR (in response to cmd_load_ip_fw command) */
     uint32_t	tmr_size;	/* +16 size of the TMR to be reserved including MM fw and Gfx fw in response to cmd_load_toc command */
 
-    uint32_t	reserved[3];
+    uint32_t	reserved[11];
+
+    union psp_gfx_uresp uresp;      /* +64 response union containing command-specific responses */
 
-    /* total 32 bytes */
+    /* total 96 bytes */
 };
 
 /* Structure of Command buffer pointed by psp_gfx_rb_frame.cmd_buf_addr_hi