crypto: ccp: Support DOWNLOAD_FIRMWARE when detect CSV

hygon inclusion
category: feature
CVE: NA

---------------------------

When ccp driver detect CSV support on Hygon CPU, it should try to
update the latest CSV firmware on the system paths.

Signed-off-by: hanliyang <hanliyang@hygon.cn>

Author: hanliyang

drivers/crypto/ccp/hygon/csv-dev.h

@@ -13,10 +13,17 @@
 #include <linux/fs.h>
 #include <linux/psp-sev.h>
 
+#define CSV_FW_FILE		"hygon/csv.fw"
+
 extern u32 hygon_csv_build;
 extern const struct file_operations csv_fops;
 
 void csv_update_api_version(struct sev_user_data_status *status);
 int csv_cmd_buffer_len(int cmd);
 
+static inline bool csv_version_greater_or_equal(u32 build)
+{
+	return hygon_csv_build >= build;
+}
+
 #endif	/* __CCP_HYGON_CSV_DEV_H__ */

drivers/crypto/ccp/sev-dev.c

@@ -758,6 +758,14 @@ static int sev_get_firmware(struct device *dev,
 	char fw_name_specific[SEV_FW_NAME_SIZE];
 	char fw_name_subset[SEV_FW_NAME_SIZE];
 
+	if (is_vendor_hygon()) {
+		/* Check for CSV FW to using generic name: csv.fw */
+		if (firmware_request_nowarn(firmware, CSV_FW_FILE, dev) >= 0)
+			return 0;
+		else
+			return -ENOENT;
+	}
+
 	snprintf(fw_name_specific, sizeof(fw_name_specific),
 		 "amd/amd_sev_fam%.2xh_model%.2xh.sbin",
 		 boot_cpu_data.x86, boot_cpu_data.x86_model);
@@ -796,13 +804,15 @@ static int sev_update_firmware(struct device *dev)
 	struct page *p;
 	u64 data_size;
 
-	if (!sev_version_greater_or_equal(0, 15)) {
+	if (!sev_version_greater_or_equal(0, 15) &&
+	    !(is_vendor_hygon() && csv_version_greater_or_equal(1667))) {
 		dev_dbg(dev, "DOWNLOAD_FIRMWARE not supported\n");
 		return -1;
 	}
 
 	if (sev_get_firmware(dev, &firmware) == -ENOENT) {
-		dev_dbg(dev, "No SEV firmware file present\n");
+		dev_dbg(dev, "No %s firmware file present\n",
+			is_vendor_hygon() ? "CSV" : "SEV");
 		return -1;
 	}
 
@@ -842,9 +852,11 @@ static int sev_update_firmware(struct device *dev)
 		ret = sev_do_cmd(SEV_CMD_DOWNLOAD_FIRMWARE, data, &error);
 
 	if (ret)
-		dev_dbg(dev, "Failed to update SEV firmware: %#x\n", error);
+		dev_dbg(dev, "Failed to update %s firmware: %#x\n",
+			is_vendor_hygon() ? "CSV" : "SEV", error);
 	else
-		dev_info(dev, "SEV firmware update successful\n");
+		dev_info(dev, "%s firmware update successful\n",
+			 is_vendor_hygon() ? "CSV" : "SEV");
 
 	__free_pages(p, order);