Function mei_send_msg

util/intelmetool/src/me.c:181–242

}

static int mei_send_msg(struct mei_header *mei, struct mkhi_header *mkhi,
			void *req_data)
{
	struct mei_csr host;
	unsigned ndata , n;
	uint32_t *data;

	/* Number of dwords to write, ignoring MKHI */
	ndata = (mei->length) >> 2;

	/* Pad non-dword aligned request message length */
	if (mei->length & 3)
		ndata++;
	if (!ndata) {
		printf("ME: request does not include MKHI\n");
		return -1;
	}
	ndata++; /* Add MEI header */

	/*
	 * Make sure there is still room left in the circular buffer.
	 * Reset the buffer pointers if the requested message will not fit.
	 */
	read_host_csr(&host);
	if ((host.buffer_depth - host.buffer_write_ptr) < ndata) {
		printf("ME: circular buffer full, resetting...\n");
		mei_reset();
		read_host_csr(&host);
	}

	/*
	 * This implementation does not handle splitting large messages
	 * across multiple transactions.  Ensure the requested length
	 * will fit in the available circular buffer depth.
	 */
	if ((host.buffer_depth - host.buffer_write_ptr) < ndata) {
		printf("ME: message (%u) too large for buffer (%u)\n",
		       ndata + 2, host.buffer_depth);
		return -1;
	}

	/* Write MEI header */
	mei_write_dword_ptr(mei, MEI_H_CB_WW);
	ndata--;

	/* Write MKHI header */
	mei_write_dword_ptr(mkhi, MEI_H_CB_WW);
	ndata--;

	/* Write message data */
	data = req_data;
	for (n = 0; n < ndata; ++n)
		write_cb(*data++);

	/* Generate interrupt to the ME */
	read_host_csr(&host);
	host.interrupt_generate = 1;
	write_host_csr(&host);