diff options
Diffstat (limited to 'drivers/hid/intel-ish-hid/ishtp/loader.c')
| -rw-r--r-- | drivers/hid/intel-ish-hid/ishtp/loader.c | 284 |
1 files changed, 284 insertions, 0 deletions
diff --git a/drivers/hid/intel-ish-hid/ishtp/loader.c b/drivers/hid/intel-ish-hid/ishtp/loader.c new file mode 100644 index 0000000000..fcca070bde --- /dev/null +++ b/drivers/hid/intel-ish-hid/ishtp/loader.c @@ -0,0 +1,284 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * ISHTP firmware loader function + * + * Copyright (c) 2024, Intel Corporation. + * + * This module implements the functionality to load the main ISH firmware from the host, starting + * with the Lunar Lake generation. It leverages a new method that enhances space optimization and + * flexibility by dividing the ISH firmware into a bootloader and main firmware. + * + * Please refer to the [Documentation](Documentation/hid/intel-ish-hid.rst) for the details on + * flows. + * + * Additionally, address potential error scenarios to ensure graceful failure handling. + * - Firmware Image Not Found: + * Occurs when `request_firmware()` cannot locate the firmware image. The ISH firmware will + * remain in a state awaiting firmware loading from the host, with no further action from + * the ISHTP driver. + * Recovery: Re-insmod the ISH drivers allows for a retry of the firmware loading from the host. + * + * - DMA Buffer Allocation Failure: + * This happens if allocating a DMA buffer during `prepare_dma_bufs()` fails. The ISH firmware + * will stay in a waiting state, and the ISHTP driver will release any allocated DMA buffers and + * firmware without further actions. + * Recovery: Re-insmod the ISH drivers allows for a retry of the firmware loading from the host. + * + * - Incorrect Firmware Image: + * Using an incorrect firmware image will initiate the firmware loading process but will + * eventually be refused by the ISH firmware after three unsuccessful attempts, indicated by + * returning an error code. The ISHTP driver will stop attempting after three tries. + * Recovery: A platform reset is required to retry firmware loading from the host. + */ + +#define dev_fmt(fmt) "ISH loader: " fmt + +#include <linux/cacheflush.h> +#include <linux/container_of.h> +#include <linux/dev_printk.h> +#include <linux/dma-mapping.h> +#include <linux/errno.h> +#include <linux/firmware.h> +#include <linux/gfp_types.h> +#include <linux/math.h> +#include <linux/module.h> +#include <linux/pfn.h> +#include <linux/string.h> +#include <linux/types.h> +#include <linux/wait.h> + +#include "hbm.h" +#include "loader.h" + +/** + * loader_write_message() - Write a message to the ISHTP device + * @dev: The ISHTP device + * @buf: The buffer containing the message + * @len: The length of the message + * + * Return: 0 on success, negative error code on failure + */ +static int loader_write_message(struct ishtp_device *dev, void *buf, int len) +{ + struct ishtp_msg_hdr ishtp_hdr = { + .fw_addr = ISHTP_LOADER_CLIENT_ADDR, + .length = len, + .msg_complete = 1, + }; + + dev->fw_loader_received = false; + + return ishtp_write_message(dev, &ishtp_hdr, buf); +} + +/** + * loader_xfer_cmd() - Transfer a command to the ISHTP device + * @dev: The ISHTP device + * @req: The request buffer + * @req_len: The length of the request + * @resp: The response buffer + * @resp_len: The length of the response + * + * Return: 0 on success, negative error code on failure + */ +static int loader_xfer_cmd(struct ishtp_device *dev, void *req, int req_len, + void *resp, int resp_len) +{ + union loader_msg_header req_hdr; + union loader_msg_header resp_hdr; + struct device *devc = dev->devc; + int rv; + + dev->fw_loader_rx_buf = resp; + dev->fw_loader_rx_size = resp_len; + + rv = loader_write_message(dev, req, req_len); + req_hdr.val32 = le32_to_cpup(req); + + if (rv < 0) { + dev_err(devc, "write cmd %u failed:%d\n", req_hdr.command, rv); + return rv; + } + + /* Wait the ACK */ + wait_event_interruptible_timeout(dev->wait_loader_recvd_msg, dev->fw_loader_received, + ISHTP_LOADER_TIMEOUT); + resp_hdr.val32 = le32_to_cpup(resp); + dev->fw_loader_rx_size = 0; + dev->fw_loader_rx_buf = NULL; + if (!dev->fw_loader_received) { + dev_err(devc, "wait response of cmd %u timeout\n", req_hdr.command); + return -ETIMEDOUT; + } + + if (!resp_hdr.is_response) { + dev_err(devc, "not a response for %u\n", req_hdr.command); + return -EBADMSG; + } + + if (req_hdr.command != resp_hdr.command) { + dev_err(devc, "unexpected cmd response %u:%u\n", req_hdr.command, + resp_hdr.command); + return -EBADMSG; + } + + if (resp_hdr.status) { + dev_err(devc, "cmd %u failed %u\n", req_hdr.command, resp_hdr.status); + return -EIO; + } + + return 0; +} + +/** + * release_dma_bufs() - Release the DMA buffer for transferring firmware fragments + * @dev: The ISHTP device + * @fragment: The ISHTP firmware fragment descriptor + * @dma_bufs: The array of DMA fragment buffers + * @fragment_size: The size of a single DMA fragment + */ +static void release_dma_bufs(struct ishtp_device *dev, + struct loader_xfer_dma_fragment *fragment, + void **dma_bufs, u32 fragment_size) +{ + dma_addr_t dma_addr; + int i; + + for (i = 0; i < FRAGMENT_MAX_NUM; i++) { + if (dma_bufs[i]) { + dma_addr = le64_to_cpu(fragment->fragment_tbl[i].ddr_adrs); + dma_free_coherent(dev->devc, fragment_size, dma_bufs[i], dma_addr); + dma_bufs[i] = NULL; + } + } +} + +/** + * prepare_dma_bufs() - Prepare the DMA buffer for transferring firmware fragments + * @dev: The ISHTP device + * @ish_fw: The ISH firmware + * @fragment: The ISHTP firmware fragment descriptor + * @dma_bufs: The array of DMA fragment buffers + * @fragment_size: The size of a single DMA fragment + * @fragment_count: Number of fragments + * + * Return: 0 on success, negative error code on failure + */ +static int prepare_dma_bufs(struct ishtp_device *dev, + const struct firmware *ish_fw, + struct loader_xfer_dma_fragment *fragment, + void **dma_bufs, u32 fragment_size, u32 fragment_count) +{ + dma_addr_t dma_addr; + u32 offset = 0; + u32 length; + int i; + + for (i = 0; i < fragment_count && offset < ish_fw->size; i++) { + dma_bufs[i] = dma_alloc_coherent(dev->devc, fragment_size, &dma_addr, GFP_KERNEL); + if (!dma_bufs[i]) + return -ENOMEM; + + fragment->fragment_tbl[i].ddr_adrs = cpu_to_le64(dma_addr); + length = clamp(ish_fw->size - offset, 0, fragment_size); + fragment->fragment_tbl[i].length = cpu_to_le32(length); + fragment->fragment_tbl[i].fw_off = cpu_to_le32(offset); + memcpy(dma_bufs[i], ish_fw->data + offset, length); + clflush_cache_range(dma_bufs[i], fragment_size); + + offset += length; + } + + return 0; +} + +/** + * ishtp_loader_work() - Load the ISHTP firmware + * @work: The work structure + * + * The ISH Loader attempts to load firmware by sending a series of commands + * to the ISH device. If a command fails to be acknowledged by the ISH device, + * the loader will retry sending the command, up to a maximum of + * ISHTP_LOADER_RETRY_TIMES. + * + * After the maximum number of retries has been reached without success, the + * ISH bootloader will return an error status code and will no longer respond + * to the driver's commands. This behavior indicates that the ISH Loader has + * encountered a critical error during the firmware loading process. + * + * In such a case, where the ISH bootloader is unresponsive after all retries + * have been exhausted, a platform reset is required to restore communication + * with the ISH device and to recover from this error state. + */ +void ishtp_loader_work(struct work_struct *work) +{ + DEFINE_RAW_FLEX(struct loader_xfer_dma_fragment, fragment, fragment_tbl, FRAGMENT_MAX_NUM); + struct ishtp_device *dev = container_of(work, struct ishtp_device, work_fw_loader); + union loader_msg_header query_hdr = { .command = LOADER_CMD_XFER_QUERY, }; + union loader_msg_header start_hdr = { .command = LOADER_CMD_START, }; + union loader_msg_header fragment_hdr = { .command = LOADER_CMD_XFER_FRAGMENT, }; + struct loader_xfer_query query = { .header = cpu_to_le32(query_hdr.val32), }; + struct loader_start start = { .header = cpu_to_le32(start_hdr.val32), }; + union loader_recv_message recv_msg; + char *filename = dev->driver_data->fw_filename; + const struct firmware *ish_fw; + void *dma_bufs[FRAGMENT_MAX_NUM] = {}; + u32 fragment_size; + u32 fragment_count; + int retry = ISHTP_LOADER_RETRY_TIMES; + int rv; + + rv = request_firmware(&ish_fw, filename, dev->devc); + if (rv < 0) { + dev_err(dev->devc, "request firmware %s failed:%d\n", filename, rv); + return; + } + + fragment->fragment.header = cpu_to_le32(fragment_hdr.val32); + fragment->fragment.xfer_mode = cpu_to_le32(LOADER_XFER_MODE_DMA); + fragment->fragment.is_last = cpu_to_le32(1); + fragment->fragment.size = cpu_to_le32(ish_fw->size); + /* Calculate the size of a single DMA fragment */ + fragment_size = PFN_ALIGN(DIV_ROUND_UP(ish_fw->size, FRAGMENT_MAX_NUM)); + /* Calculate the count of DMA fragments */ + fragment_count = DIV_ROUND_UP(ish_fw->size, fragment_size); + fragment->fragment_cnt = cpu_to_le32(fragment_count); + + rv = prepare_dma_bufs(dev, ish_fw, fragment, dma_bufs, fragment_size, fragment_count); + if (rv) { + dev_err(dev->devc, "prepare DMA buffer failed.\n"); + goto out; + } + + do { + query.image_size = cpu_to_le32(ish_fw->size); + rv = loader_xfer_cmd(dev, &query, sizeof(query), recv_msg.raw_data, + sizeof(struct loader_xfer_query_ack)); + if (rv) + continue; /* try again if failed */ + + dev_dbg(dev->devc, "ISH Version %u.%u.%u.%u\n", + recv_msg.query_ack.version_major, + recv_msg.query_ack.version_minor, + recv_msg.query_ack.version_hotfix, + recv_msg.query_ack.version_build); + + rv = loader_xfer_cmd(dev, fragment, + struct_size(fragment, fragment_tbl, fragment_count), + recv_msg.raw_data, sizeof(struct loader_xfer_fragment_ack)); + if (rv) + continue; /* try again if failed */ + + rv = loader_xfer_cmd(dev, &start, sizeof(start), recv_msg.raw_data, + sizeof(struct loader_start_ack)); + if (rv) + continue; /* try again if failed */ + + dev_info(dev->devc, "firmware loaded. size:%zu\n", ish_fw->size); + break; + } while (--retry); + +out: + release_dma_bufs(dev, fragment, dma_bufs, fragment_size); + release_firmware(ish_fw); +} |