1 files changed, 351 insertions, 0 deletions

diff --git a/drivers/net/wireless/intel/iwlwifi/fw/paging.c b/drivers/net/wireless/intel/iwlwifi/fw/paging.c
new file mode 100644
index 000000000..9b8dd7fe7
--- /dev/null
+++ b/drivers/net/wireless/intel/iwlwifi/fw/paging.c
@@ -0,0 +1,351 @@
+/******************************************************************************
+ *
+ * This file is provided under a dual BSD/GPLv2 license.  When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
+ * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
+ * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
+ * Copyright(c) 2018        Intel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * The full GNU General Public License is included in this distribution
+ * in the file called COPYING.
+ *
+ * Contact Information:
+ *  Intel Linux Wireless <linuxwifi@intel.com>
+ * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
+ *
+ * BSD LICENSE
+ *
+ * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
+ * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
+ * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
+ * Copyright(c) 2018        Intel Corporation
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *  * Neither the name Intel Corporation nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *****************************************************************************/
+#include "iwl-drv.h"
+#include "runtime.h"
+#include "fw/api/commands.h"
+
+void iwl_free_fw_paging(struct iwl_fw_runtime *fwrt)
+{
+	int i;
+
+	if (!fwrt->fw_paging_db[0].fw_paging_block)
+		return;
+
+	for (i = 0; i < NUM_OF_FW_PAGING_BLOCKS; i++) {
+		struct iwl_fw_paging *paging = &fwrt->fw_paging_db[i];
+
+		if (!paging->fw_paging_block) {
+			IWL_DEBUG_FW(fwrt,
+				     "Paging: block %d already freed, continue to next page\n",
+				     i);
+
+			continue;
+		}
+		dma_unmap_page(fwrt->trans->dev, paging->fw_paging_phys,
+			       paging->fw_paging_size, DMA_BIDIRECTIONAL);
+
+		__free_pages(paging->fw_paging_block,
+			     get_order(paging->fw_paging_size));
+		paging->fw_paging_block = NULL;
+	}
+
+	memset(fwrt->fw_paging_db, 0, sizeof(fwrt->fw_paging_db));
+}
+IWL_EXPORT_SYMBOL(iwl_free_fw_paging);
+
+static int iwl_alloc_fw_paging_mem(struct iwl_fw_runtime *fwrt,
+				   const struct fw_img *image)
+{
+	struct page *block;
+	dma_addr_t phys = 0;
+	int blk_idx, order, num_of_pages, size;
+
+	if (fwrt->fw_paging_db[0].fw_paging_block)
+		return 0;
+
+	/* ensure BLOCK_2_EXP_SIZE is power of 2 of PAGING_BLOCK_SIZE */
+	BUILD_BUG_ON(BIT(BLOCK_2_EXP_SIZE) != PAGING_BLOCK_SIZE);
+
+	num_of_pages = image->paging_mem_size / FW_PAGING_SIZE;
+	fwrt->num_of_paging_blk =
+		DIV_ROUND_UP(num_of_pages, NUM_OF_PAGE_PER_GROUP);
+	fwrt->num_of_pages_in_last_blk =
+		num_of_pages -
+		NUM_OF_PAGE_PER_GROUP * (fwrt->num_of_paging_blk - 1);
+
+	IWL_DEBUG_FW(fwrt,
+		     "Paging: allocating mem for %d paging blocks, each block holds 8 pages, last block holds %d pages\n",
+		     fwrt->num_of_paging_blk,
+		     fwrt->num_of_pages_in_last_blk);
+
+	/*
+	 * Allocate CSS and paging blocks in dram.
+	 */
+	for (blk_idx = 0; blk_idx < fwrt->num_of_paging_blk + 1; blk_idx++) {
+		/* For CSS allocate 4KB, for others PAGING_BLOCK_SIZE (32K) */
+		size = blk_idx ? PAGING_BLOCK_SIZE : FW_PAGING_SIZE;
+		order = get_order(size);
+		block = alloc_pages(GFP_KERNEL, order);
+		if (!block) {
+			/* free all the previous pages since we failed */
+			iwl_free_fw_paging(fwrt);
+			return -ENOMEM;
+		}
+
+		fwrt->fw_paging_db[blk_idx].fw_paging_block = block;
+		fwrt->fw_paging_db[blk_idx].fw_paging_size = size;
+
+		phys = dma_map_page(fwrt->trans->dev, block, 0,
+				    PAGE_SIZE << order,
+				    DMA_BIDIRECTIONAL);
+		if (dma_mapping_error(fwrt->trans->dev, phys)) {
+			/*
+			 * free the previous pages and the current one
+			 * since we failed to map_page.
+			 */
+			iwl_free_fw_paging(fwrt);
+			return -ENOMEM;
+		}
+		fwrt->fw_paging_db[blk_idx].fw_paging_phys = phys;
+
+		if (!blk_idx)
+			IWL_DEBUG_FW(fwrt,
+				     "Paging: allocated 4K(CSS) bytes (order %d) for firmware paging.\n",
+				     order);
+		else
+			IWL_DEBUG_FW(fwrt,
+				     "Paging: allocated 32K bytes (order %d) for firmware paging.\n",
+				     order);
+	}
+
+	return 0;
+}
+
+static int iwl_fill_paging_mem(struct iwl_fw_runtime *fwrt,
+			       const struct fw_img *image)
+{
+	int sec_idx, idx, ret;
+	u32 offset = 0;
+
+	/*
+	 * find where is the paging image start point:
+	 * if CPU2 exist and it's in paging format, then the image looks like:
+	 * CPU1 sections (2 or more)
+	 * CPU1_CPU2_SEPARATOR_SECTION delimiter - separate between CPU1 to CPU2
+	 * CPU2 sections (not paged)
+	 * PAGING_SEPARATOR_SECTION delimiter - separate between CPU2
+	 * non paged to CPU2 paging sec
+	 * CPU2 paging CSS
+	 * CPU2 paging image (including instruction and data)
+	 */
+	for (sec_idx = 0; sec_idx < image->num_sec; sec_idx++) {
+		if (image->sec[sec_idx].offset == PAGING_SEPARATOR_SECTION) {
+			sec_idx++;
+			break;
+		}
+	}
+
+	/*
+	 * If paging is enabled there should be at least 2 more sections left
+	 * (one for CSS and one for Paging data)
+	 */
+	if (sec_idx >= image->num_sec - 1) {
+		IWL_ERR(fwrt, "Paging: Missing CSS and/or paging sections\n");
+		ret = -EINVAL;
+		goto err;
+	}
+
+	/* copy the CSS block to the dram */
+	IWL_DEBUG_FW(fwrt, "Paging: load paging CSS to FW, sec = %d\n",
+		     sec_idx);
+
+	if (image->sec[sec_idx].len > fwrt->fw_paging_db[0].fw_paging_size) {
+		IWL_ERR(fwrt, "CSS block is larger than paging size\n");
+		ret = -EINVAL;
+		goto err;
+	}
+
+	memcpy(page_address(fwrt->fw_paging_db[0].fw_paging_block),
+	       image->sec[sec_idx].data,
+	       image->sec[sec_idx].len);
+	dma_sync_single_for_device(fwrt->trans->dev,
+				   fwrt->fw_paging_db[0].fw_paging_phys,
+				   fwrt->fw_paging_db[0].fw_paging_size,
+				   DMA_BIDIRECTIONAL);
+
+	IWL_DEBUG_FW(fwrt,
+		     "Paging: copied %d CSS bytes to first block\n",
+		     fwrt->fw_paging_db[0].fw_paging_size);
+
+	sec_idx++;
+
+	/*
+	 * Copy the paging blocks to the dram.  The loop index starts
+	 * from 1 since the CSS block (index 0) was already copied to
+	 * dram.  We use num_of_paging_blk + 1 to account for that.
+	 */
+	for (idx = 1; idx < fwrt->num_of_paging_blk + 1; idx++) {
+		struct iwl_fw_paging *block = &fwrt->fw_paging_db[idx];
+		int remaining = image->sec[sec_idx].len - offset;
+		int len = block->fw_paging_size;
+
+		/*
+		 * For the last block, we copy all that is remaining,
+		 * for all other blocks, we copy fw_paging_size at a
+		 * time. */
+		if (idx == fwrt->num_of_paging_blk) {
+			len = remaining;
+			if (remaining !=
+			    fwrt->num_of_pages_in_last_blk * FW_PAGING_SIZE) {
+				IWL_ERR(fwrt,
+					"Paging: last block contains more data than expected %d\n",
+					remaining);
+				ret = -EINVAL;
+				goto err;
+			}
+		} else if (block->fw_paging_size > remaining) {
+			IWL_ERR(fwrt,
+				"Paging: not enough data in other in block %d (%d)\n",
+				idx, remaining);
+			ret = -EINVAL;
+			goto err;
+		}
+
+		memcpy(page_address(block->fw_paging_block),
+		       image->sec[sec_idx].data + offset, len);
+		dma_sync_single_for_device(fwrt->trans->dev,
+					   block->fw_paging_phys,
+					   block->fw_paging_size,
+					   DMA_BIDIRECTIONAL);
+
+		IWL_DEBUG_FW(fwrt,
+			     "Paging: copied %d paging bytes to block %d\n",
+			     len, idx);
+
+		offset += block->fw_paging_size;
+	}
+
+	return 0;
+
+err:
+	iwl_free_fw_paging(fwrt);
+	return ret;
+}
+
+static int iwl_save_fw_paging(struct iwl_fw_runtime *fwrt,
+			      const struct fw_img *fw)
+{
+	int ret;
+
+	ret = iwl_alloc_fw_paging_mem(fwrt, fw);
+	if (ret)
+		return ret;
+
+	return iwl_fill_paging_mem(fwrt, fw);
+}
+
+/* send paging cmd to FW in case CPU2 has paging image */
+static int iwl_send_paging_cmd(struct iwl_fw_runtime *fwrt,
+			       const struct fw_img *fw)
+{
+	struct iwl_fw_paging_cmd paging_cmd = {
+		.flags = cpu_to_le32(PAGING_CMD_IS_SECURED |
+				     PAGING_CMD_IS_ENABLED |
+				     (fwrt->num_of_pages_in_last_blk <<
+				      PAGING_CMD_NUM_OF_PAGES_IN_LAST_GRP_POS)),
+		.block_size = cpu_to_le32(BLOCK_2_EXP_SIZE),
+		.block_num = cpu_to_le32(fwrt->num_of_paging_blk),
+	};
+	struct iwl_host_cmd hcmd = {
+		.id = iwl_cmd_id(FW_PAGING_BLOCK_CMD, IWL_ALWAYS_LONG_GROUP, 0),
+		.len = { sizeof(paging_cmd), },
+		.data = { &paging_cmd, },
+	};
+	int blk_idx;
+
+	/* loop for for all paging blocks + CSS block */
+	for (blk_idx = 0; blk_idx < fwrt->num_of_paging_blk + 1; blk_idx++) {
+		dma_addr_t addr = fwrt->fw_paging_db[blk_idx].fw_paging_phys;
+		__le32 phy_addr;
+
+		addr = addr >> PAGE_2_EXP_SIZE;
+		phy_addr = cpu_to_le32(addr);
+		paging_cmd.device_phy_addr[blk_idx] = phy_addr;
+	}
+
+	return iwl_trans_send_cmd(fwrt->trans, &hcmd);
+}
+
+int iwl_init_paging(struct iwl_fw_runtime *fwrt, enum iwl_ucode_type type)
+{
+	const struct fw_img *fw = &fwrt->fw->img[type];
+	int ret;
+
+	if (fwrt->trans->cfg->gen2)
+		return 0;
+
+	/*
+	 * Configure and operate fw paging mechanism.
+	 * The driver configures the paging flow only once.
+	 * The CPU2 paging image is included in the IWL_UCODE_INIT image.
+	 */
+	if (!fw->paging_mem_size)
+		return 0;
+
+	ret = iwl_save_fw_paging(fwrt, fw);
+	if (ret) {
+		IWL_ERR(fwrt, "failed to save the FW paging image\n");
+		return ret;
+	}
+
+	ret = iwl_send_paging_cmd(fwrt, fw);
+	if (ret) {
+		IWL_ERR(fwrt, "failed to send the paging cmd\n");
+		iwl_free_fw_paging(fwrt);
+		return ret;
+	}
+
+	return 0;
+}
+IWL_EXPORT_SYMBOL(iwl_init_paging);