drm/amdgpu: Introduce SRIOV critical regions v2 during VF init

1. Introduced amdgpu_virt_init_critical_region during VF init.
- VFs use init_data_header_offset and init_data_header_size_kb
transmitted via PF2VF mailbox to fetch the offset of
critical regions' offsets/sizes in VRAM and save to
adev->virt.crit_region_offsets and adev->virt.crit_region_sizes_kb.

Signed-off-by: Ellen Pan <[e-mail]>
Reviewed-by: Alex Deucher <[e-mail]>
Reviewed-by: Lijo Lazar <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

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

···
 		r = amdgpu_virt_request_full_gpu(adev, true);
 		if (r)
 			return r;
+
+		r = amdgpu_virt_init_critical_region(adev);
+		if (r)
+			return r;
 	}
 
 	switch (adev->asic_type) {

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

···
 		vf2pf_info->ucode_info[ucode].version = ver; \
 	} while (0)
 
+#define mmRCC_CONFIG_MEMSIZE    0xde3
+
+const char *amdgpu_virt_dynamic_crit_table_name[] = {
+	"IP DISCOVERY",
+	"VBIOS IMG",
+	"RAS TELEMETRY",
+	"DATA EXCHANGE",
+	"BAD PAGE INFO",
+	"INIT HEADER",
+	"LAST",
+};
+
 bool amdgpu_virt_mmio_blocked(struct amdgpu_device *adev)
 {
 	/* By now all MMIO pages except mailbox are blocked */
···
 	mutex_init(&adev->virt.ras.ras_telemetry_mutex);
 
 	adev->virt.ras.cper_rptr = 0;
+}
+
+static uint8_t amdgpu_virt_crit_region_calc_checksum(uint8_t *buf_start, uint8_t *buf_end)
+{
+	uint32_t sum = 0;
+
+	if (buf_start >= buf_end)
+		return 0;
+
+	for (; buf_start < buf_end; buf_start++)
+		sum += buf_start[0];
+
+	return 0xffffffff - sum;
+}
+
+int amdgpu_virt_init_critical_region(struct amdgpu_device *adev)
+{
+	struct amd_sriov_msg_init_data_header *init_data_hdr = NULL;
+	uint32_t init_hdr_offset = adev->virt.init_data_header.offset;
+	uint32_t init_hdr_size = adev->virt.init_data_header.size_kb << 10;
+	uint64_t vram_size;
+	int r = 0;
+	uint8_t checksum = 0;
+
+	/* Skip below init if critical region version != v2 */
+	if (adev->virt.req_init_data_ver != GPU_CRIT_REGION_V2)
+		return 0;
+
+	if (init_hdr_offset < 0) {
+		dev_err(adev->dev, "Invalid init header offset\n");
+		return -EINVAL;
+	}
+
+	vram_size = RREG32(mmRCC_CONFIG_MEMSIZE);
+	if (!vram_size || vram_size == U32_MAX)
+		return -EINVAL;
+	vram_size <<= 20;
+
+	if ((init_hdr_offset + init_hdr_size) > vram_size) {
+		dev_err(adev->dev, "init_data_header exceeds VRAM size, exiting\n");
+		return -EINVAL;
+	}
+
+	/* Allocate for init_data_hdr */
+	init_data_hdr = kzalloc(sizeof(struct amd_sriov_msg_init_data_header), GFP_KERNEL);
+	if (!init_data_hdr)
+		return -ENOMEM;
+
+	amdgpu_device_vram_access(adev, (uint64_t)init_hdr_offset, (uint32_t *)init_data_hdr,
+					sizeof(struct amd_sriov_msg_init_data_header), false);
+
+	/* Table validation */
+	if (strncmp(init_data_hdr->signature,
+				AMDGPU_SRIOV_CRIT_DATA_SIGNATURE,
+				AMDGPU_SRIOV_CRIT_DATA_SIG_LEN) != 0) {
+		dev_err(adev->dev, "Invalid init data signature: %.4s\n",
+			init_data_hdr->signature);
+		r = -EINVAL;
+		goto out;
+	}
+
+	checksum = amdgpu_virt_crit_region_calc_checksum(
+			(uint8_t *)&init_data_hdr->initdata_offset,
+			(uint8_t *)init_data_hdr +
+			sizeof(struct amd_sriov_msg_init_data_header));
+	if (checksum != init_data_hdr->checksum) {
+		dev_err(adev->dev, "Found unmatching checksum from calculation 0x%x and init_data 0x%x\n",
+				checksum, init_data_hdr->checksum);
+		r = -EINVAL;
+		goto out;
+	}
+
+	memset(&adev->virt.crit_regn, 0, sizeof(adev->virt.crit_regn));
+	memset(adev->virt.crit_regn_tbl, 0, sizeof(adev->virt.crit_regn_tbl));
+
+	adev->virt.crit_regn.offset = init_data_hdr->initdata_offset;
+	adev->virt.crit_regn.size_kb = init_data_hdr->initdata_size_in_kb;
+
+	/* Validation and initialization for each table entry */
+	if (IS_SRIOV_CRIT_REGN_ENTRY_VALID(init_data_hdr, AMD_SRIOV_MSG_IPD_TABLE_ID)) {
+		if (!init_data_hdr->ip_discovery_size_in_kb ||
+				init_data_hdr->ip_discovery_size_in_kb > DISCOVERY_TMR_SIZE) {
+			dev_err(adev->dev, "Invalid %s size: 0x%x\n",
+				amdgpu_virt_dynamic_crit_table_name[AMD_SRIOV_MSG_IPD_TABLE_ID],
+				init_data_hdr->ip_discovery_size_in_kb);
+			r = -EINVAL;
+			goto out;
+		}
+
+		adev->virt.crit_regn_tbl[AMD_SRIOV_MSG_IPD_TABLE_ID].offset =
+			init_data_hdr->ip_discovery_offset;
+		adev->virt.crit_regn_tbl[AMD_SRIOV_MSG_IPD_TABLE_ID].size_kb =
+			init_data_hdr->ip_discovery_size_in_kb;
+	}
+
+	if (IS_SRIOV_CRIT_REGN_ENTRY_VALID(init_data_hdr, AMD_SRIOV_MSG_VBIOS_IMG_TABLE_ID)) {
+		if (!init_data_hdr->vbios_img_size_in_kb) {
+			dev_err(adev->dev, "Invalid %s size: 0x%x\n",
+				amdgpu_virt_dynamic_crit_table_name[AMD_SRIOV_MSG_VBIOS_IMG_TABLE_ID],
+				init_data_hdr->vbios_img_size_in_kb);
+			r = -EINVAL;
+			goto out;
+		}
+
+		adev->virt.crit_regn_tbl[AMD_SRIOV_MSG_VBIOS_IMG_TABLE_ID].offset =
+			init_data_hdr->vbios_img_offset;
+		adev->virt.crit_regn_tbl[AMD_SRIOV_MSG_VBIOS_IMG_TABLE_ID].size_kb =
+			init_data_hdr->vbios_img_size_in_kb;
+	}
+
+	if (IS_SRIOV_CRIT_REGN_ENTRY_VALID(init_data_hdr, AMD_SRIOV_MSG_RAS_TELEMETRY_TABLE_ID)) {
+		if (!init_data_hdr->ras_tele_info_size_in_kb) {
+			dev_err(adev->dev, "Invalid %s size: 0x%x\n",
+				amdgpu_virt_dynamic_crit_table_name[AMD_SRIOV_MSG_RAS_TELEMETRY_TABLE_ID],
+				init_data_hdr->ras_tele_info_size_in_kb);
+			r = -EINVAL;
+			goto out;
+		}
+
+		adev->virt.crit_regn_tbl[AMD_SRIOV_MSG_RAS_TELEMETRY_TABLE_ID].offset =
+			init_data_hdr->ras_tele_info_offset;
+		adev->virt.crit_regn_tbl[AMD_SRIOV_MSG_RAS_TELEMETRY_TABLE_ID].size_kb =
+			init_data_hdr->ras_tele_info_size_in_kb;
+	}
+
+	if (IS_SRIOV_CRIT_REGN_ENTRY_VALID(init_data_hdr, AMD_SRIOV_MSG_DATAEXCHANGE_TABLE_ID)) {
+		if (!init_data_hdr->dataexchange_size_in_kb) {
+			dev_err(adev->dev, "Invalid %s size: 0x%x\n",
+				amdgpu_virt_dynamic_crit_table_name[AMD_SRIOV_MSG_DATAEXCHANGE_TABLE_ID],
+				init_data_hdr->dataexchange_size_in_kb);
+			r = -EINVAL;
+			goto out;
+		}
+
+		adev->virt.crit_regn_tbl[AMD_SRIOV_MSG_DATAEXCHANGE_TABLE_ID].offset =
+			init_data_hdr->dataexchange_offset;
+		adev->virt.crit_regn_tbl[AMD_SRIOV_MSG_DATAEXCHANGE_TABLE_ID].size_kb =
+			init_data_hdr->dataexchange_size_in_kb;
+	}
+
+	if (IS_SRIOV_CRIT_REGN_ENTRY_VALID(init_data_hdr, AMD_SRIOV_MSG_BAD_PAGE_INFO_TABLE_ID)) {
+		if (!init_data_hdr->bad_page_size_in_kb) {
+			dev_err(adev->dev, "Invalid %s size: 0x%x\n",
+				amdgpu_virt_dynamic_crit_table_name[AMD_SRIOV_MSG_BAD_PAGE_INFO_TABLE_ID],
+				init_data_hdr->bad_page_size_in_kb);
+			r = -EINVAL;
+			goto out;
+		}
+
+		adev->virt.crit_regn_tbl[AMD_SRIOV_MSG_BAD_PAGE_INFO_TABLE_ID].offset =
+			init_data_hdr->bad_page_info_offset;
+		adev->virt.crit_regn_tbl[AMD_SRIOV_MSG_BAD_PAGE_INFO_TABLE_ID].size_kb =
+			init_data_hdr->bad_page_size_in_kb;
+	}
+
+	adev->virt.is_dynamic_crit_regn_enabled = true;
+
+out:
+	kfree(init_data_hdr);
+	init_data_hdr = NULL;
+
+	return r;
 }
 
 void amdgpu_virt_init(struct amdgpu_device *adev)

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

···
 
 #define AMDGPU_VF2PF_UPDATE_MAX_RETRY_LIMIT 2
 
+/* Signature used to validate the SR-IOV dynamic critical region init data header ("INDA") */
+#define AMDGPU_SRIOV_CRIT_DATA_SIGNATURE "INDA"
+#define AMDGPU_SRIOV_CRIT_DATA_SIG_LEN   4
+
+#define IS_SRIOV_CRIT_REGN_ENTRY_VALID(hdr, id) ((hdr)->valid_tables & (1 << (id)))
+
 enum amdgpu_sriov_vf_mode {
 	SRIOV_VF_MODE_BARE_METAL = 0,
 	SRIOV_VF_MODE_ONE_VF,
···
 
 	/* dynamic(v2) critical regions */
 	struct amdgpu_virt_region init_data_header;
+	struct amdgpu_virt_region crit_regn;
+	struct amdgpu_virt_region crit_regn_tbl[AMD_SRIOV_MSG_MAX_TABLE_ID];
+	bool is_dynamic_crit_regn_enabled;
 
 	/* vf2pf message */
 	struct delayed_work vf2pf_work;
···
 void amdgpu_virt_exchange_data(struct amdgpu_device *adev);
 void amdgpu_virt_fini_data_exchange(struct amdgpu_device *adev);
 void amdgpu_virt_init(struct amdgpu_device *adev);
+
+int amdgpu_virt_init_critical_region(struct amdgpu_device *adev);
 
 bool amdgpu_virt_can_access_debugfs(struct amdgpu_device *adev);
 int amdgpu_virt_enable_access_debugfs(struct amdgpu_device *adev);

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

···
 	GPU_CRIT_REGION_V2 = 2,
 };
 
+/* v2 layout offset enum (in order of allocation) */
+enum amd_sriov_msg_table_id_enum {
+	AMD_SRIOV_MSG_IPD_TABLE_ID = 0,
+	AMD_SRIOV_MSG_VBIOS_IMG_TABLE_ID,
+	AMD_SRIOV_MSG_RAS_TELEMETRY_TABLE_ID,
+	AMD_SRIOV_MSG_DATAEXCHANGE_TABLE_ID,
+	AMD_SRIOV_MSG_BAD_PAGE_INFO_TABLE_ID,
+	AMD_SRIOV_MSG_INITD_H_TABLE_ID,
+	AMD_SRIOV_MSG_MAX_TABLE_ID,
+};
+
+struct amd_sriov_msg_init_data_header {
+	char     signature[4];  /* "INDA"  */
+	uint32_t version;
+	uint32_t checksum;
+	uint32_t initdata_offset; /* 0 */
+	uint32_t initdata_size_in_kb; /* 5MB */
+	uint32_t valid_tables;
+	uint32_t vbios_img_offset;
+	uint32_t vbios_img_size_in_kb;
+	uint32_t dataexchange_offset;
+	uint32_t dataexchange_size_in_kb;
+	uint32_t ras_tele_info_offset;
+	uint32_t ras_tele_info_size_in_kb;
+	uint32_t ip_discovery_offset;
+	uint32_t ip_discovery_size_in_kb;
+	uint32_t bad_page_info_offset;
+	uint32_t bad_page_size_in_kb;
+	uint32_t reserved[8];
+};
+
 /*
  * PF2VF history log:
  * v1 defined in amdgim