prd: Implement generic HBRT - FSP interface

This patch implements generic interface to pass data from HBRT to FSP
during runtime (HBRT -> opal-prd -> kernel -> OPAL -> FSP).

HBRT sends data via firmware_request interface. We have to convert that to
MBOX format and send it to FSP. OPAL uses TCE mapped memory to send data.
FSP will reuse same memory for response. Once processing is complete FSP
sends response to OPAL. Finally OPAL calls HBRT with firmware_response
message.

Also introduces new opal_msg type (OPAL_MSG_PRD2) to pass bigger prd message
to kernel.
  - if (prd_msg > OPAL_MSG_FIXED_PARAMS_SIZE)
	use OPAL_MSG_PRD2

Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
Signed-off-by: Stewart Smith <stewart@linux.ibm.com>

1 files changed, 77 insertions, 0 deletions

diff --git a/core/hostservices.c b/core/hostservices.c
index d3a9b3c..bf1b308 100644
--- a/core/hostservices.c
+++ b/core/hostservices.c
@@ -802,3 +802,80 @@ bool hservices_init(void)
 
 	return true;
 }		
+
+static void hservice_send_hbrt_msg_resp(struct fsp_msg *msg)
+{
+	int status = (msg->resp->word1 >> 8) & 0xff;
+
+	fsp_freemsg(msg);
+	if (status) {
+		prlog(PR_NOTICE, "HBRT: HBRT to FSP MBOX command failed "
+		      "[rc=0x%x]\n", status);
+	}
+
+	fsp_tce_unmap(PSI_DMA_HBRT_FSP_MSG, PSI_DMA_HBRT_FSP_MSG_SIZE);
+	/* Send response data to HBRT */
+	prd_fw_resp_fsp_response(status);
+}
+
+#define FSP_STATUS_RR	(-8193)
+/* Caller takes care of serializing MBOX message */
+int hservice_send_hbrt_msg(void *data, u64 dsize)
+{
+	uint32_t tce_len, offset;
+	int rc;
+	uint64_t addr;
+	struct fsp_msg *msg;
+
+	prlog(PR_NOTICE, "HBRT: HBRT - FSP message generated\n");
+
+	/* We only support FSP based system */
+	if (!fsp_present()) {
+		prlog(PR_DEBUG,
+		      "HBRT: Warning, HBRT - FSP message discarded!\n");
+		return OPAL_UNSUPPORTED;
+	}
+
+	/*
+	 * If FSP is in R/R then send specific return code to HBRT (inside
+	 * HBRT message) and return success to caller (opal_prd_msg()).
+	 */
+	if (fsp_in_rr()) {
+		prlog(PR_DEBUG,
+		      "HBRT: FSP is in R/R. Dropping HBRT - FSP message\n");
+		prd_fw_resp_fsp_response(FSP_STATUS_RR);
+		return OPAL_SUCCESS;
+	}
+
+	/* Adjust address, size for TCE mapping */
+	addr = (u64)data & ~TCE_MASK;
+	offset = (u64)data & TCE_MASK;
+	tce_len = ALIGN_UP((dsize + offset), TCE_PSIZE);
+
+	if (tce_len > PSI_DMA_HBRT_FSP_MSG_SIZE) {
+		prlog(PR_DEBUG,
+		      "HBRT: HBRT - FSP message is too big, discarded\n");
+		return OPAL_PARAMETER;
+	}
+	fsp_tce_map(PSI_DMA_HBRT_FSP_MSG, (void *)addr, tce_len);
+
+	msg = fsp_mkmsg(FSP_CMD_HBRT_TO_FSP, 3, 0,
+			(PSI_DMA_HBRT_FSP_MSG + offset), dsize);
+	if (!msg) {
+		prlog(PR_DEBUG,
+		      "HBRT: Failed to create HBRT - FSP message to FSP\n");
+		rc = OPAL_NO_MEM;
+		goto out_tce_unmap;
+	}
+
+	rc = fsp_queue_msg(msg, hservice_send_hbrt_msg_resp);
+	if (rc == 0)
+		return rc;
+
+	prlog(PR_DEBUG, "HBRT: Failed to queue HBRT message to FSP\n");
+	fsp_freemsg(msg);
+
+out_tce_unmap:
+	fsp_tce_unmap(PSI_DMA_HBRT_FSP_MSG, PSI_DMA_HBRT_FSP_MSG_SIZE);
+	return rc;
+}