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Date:   Sun, 24 Mar 2019 08:36:06 -0700
From:   Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To:     Rushikesh S Kadam <rushikesh.s.kadam@...el.com>,
        benjamin.tissoires@...hat.com, jikos@...nel.org
Cc:     ncrews@...omium.org, jettrink@...omium.org, gwendal@...gle.com,
        linux-kernel@...r.kernel.org, linux-input@...r.kernel.org
Subject: Re: [PATCH] HID: intel-ish-hid: ISH firmware loader client driver

On Sat, 2019-03-23 at 16:46 +0530, Rushikesh S Kadam wrote:
> This driver adds support for loading Intel Integrated
> Sensor Hub (ISH) firmware from host file system to ISH
> SRAM and start execution.
> 
> At power-on, the ISH subsystem shall boot to an interim
> Shim loader-firmware, which shall expose an ISHTP loader
> device.
> 
> The driver implements an ISHTP client that communicates
> with the Shim ISHTP loader device over the intel-ish-hid
> stack, to download the main ISH firmware.
> 
> Signed-off-by: Rushikesh S Kadam <rushikesh.s.kadam@...el.com>
Anybody in CC list here can add Reviewed-By/Tested-by tag?

One comment below for copyright year.

Thanks,
Srinivas
> ---
> The patches are baselined to hid git tree, branch for-5.2/ish 
> 
https://git.kernel.org/pub/scm/linux/kernel/git/hid/hid.git/log/?h=for-5.2/ish
> 
>  drivers/hid/Makefile                        |    1 +
>  drivers/hid/intel-ish-hid/Kconfig           |   15 +
>  drivers/hid/intel-ish-hid/Makefile          |    3 +
>  drivers/hid/intel-ish-hid/ishtp-fw-loader.c | 1103
> +++++++++++++++++++++++++++
>  4 files changed, 1122 insertions(+)
>  create mode 100644 drivers/hid/intel-ish-hid/ishtp-fw-loader.c
> 
> diff --git a/drivers/hid/Makefile b/drivers/hid/Makefile
> index 170163b..d8d393e 100644
> --- a/drivers/hid/Makefile
> +++ b/drivers/hid/Makefile
> @@ -134,3 +134,4 @@ obj-$(CONFIG_USB_KBD)		+= usbhid/
>  obj-$(CONFIG_I2C_HID)		+= i2c-hid/
>  
>  obj-$(CONFIG_INTEL_ISH_HID)	+= intel-ish-hid/
> +obj-$(INTEL_ISH_FIRMWARE_DOWNLOADER)	+= intel-ish-hid/
> diff --git a/drivers/hid/intel-ish-hid/Kconfig b/drivers/hid/intel-
> ish-hid/Kconfig
> index 519e4c8..786adbc 100644
> --- a/drivers/hid/intel-ish-hid/Kconfig
> +++ b/drivers/hid/intel-ish-hid/Kconfig
> @@ -14,4 +14,19 @@ config INTEL_ISH_HID
>  	  Broxton and Kaby Lake.
>  
>  	  Say Y here if you want to support Intel ISH. If unsure, say
> N.
> +
> +config INTEL_ISH_FIRMWARE_DOWNLOADER
> +	tristate "Host Firmware Load feature for Intel ISH"
> +	depends on INTEL_ISH_HID
> +	depends on X86
> +	help
> +	  The Integrated Sensor Hub (ISH) enables the kernel to offload
> +	  sensor polling and algorithm processing to a dedicated low
> power
> +	  processor in the chipset.
> +
> +	  The Host Firmware Load feature adds support to load the ISH
> +	  firmware from host file system at boot.
> +
> +	  Say M here if you want to support Host Firmware Loading
> feature
> +	  for Intel ISH. If unsure, say N.
>  endmenu
> diff --git a/drivers/hid/intel-ish-hid/Makefile b/drivers/hid/intel-
> ish-hid/Makefile
> index 825b70a..2de97e4 100644
> --- a/drivers/hid/intel-ish-hid/Makefile
> +++ b/drivers/hid/intel-ish-hid/Makefile
> @@ -20,4 +20,7 @@ obj-$(CONFIG_INTEL_ISH_HID) += intel-ishtp-hid.o
>  intel-ishtp-hid-objs := ishtp-hid.o
>  intel-ishtp-hid-objs += ishtp-hid-client.o
>  
> +obj-$(CONFIG_INTEL_ISH_FIRMWARE_DOWNLOADER) += intel-ishtp-loader.o
> +intel-ishtp-loader-objs += ishtp-fw-loader.o
> +
>  ccflags-y += -Idrivers/hid/intel-ish-hid/ishtp
> diff --git a/drivers/hid/intel-ish-hid/ishtp-fw-loader.c
> b/drivers/hid/intel-ish-hid/ishtp-fw-loader.c
> new file mode 100644
> index 0000000..85d71d3
> --- /dev/null
> +++ b/drivers/hid/intel-ish-hid/ishtp-fw-loader.c
> @@ -0,0 +1,1103 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * ISH-TP client driver for ISH firmware loading
> + *
> + * Copyright (c) 2018, Intel Corporation.
Year 2019.

> + */
> +
> +#include <linux/firmware.h>
> +#include <linux/module.h>
> +#include <linux/pci.h>
> +#include <linux/intel-ish-client-if.h>
> +#include <linux/property.h>
> +#include <asm/cacheflush.h>
> +
> +/* ISH TX/RX ring buffer pool size */
> +#define LOADER_CL_RX_RING_SIZE			1
> +#define LOADER_CL_TX_RING_SIZE			1
> +
> +/*
> + * ISH Shim firmware loader reserves 4 Kb buffer in SRAM. The buffer
> is
> + * used to temporarily hold the data transferred from host to Shim
> firmware
> + * loader. Reason for the odd size of 3968 bytes? Each IPC transfer
> is 128
> + * bytes (= 4 bytes header + 124 bytes payload). So the 4 Kb buffer
> can
> + * hold maximum of 32 IPC transfers, which means we can have a max
> payload
> + * of 3968 bytes (= 32 x 124 payload).
> + */
> +#define LOADER_SHIM_IPC_BUF_SIZE		3968
> +
> +/**
> + * enum ish_loader_commands -	ISH loader host commands.
> + * LOADER_CMD_XFER_QUERY	Query the Shim firmware loader for
> capabilities
> + * LOADER_CMD_XFER_FRAGMENT	Transfer one firmware image framgment
> at a
> + *				time. The command may be executed
> multiple
> + *				times until the entire firmware image
> is
> + *				downloaded to SRAM.
> + * LOADER_CMD_START		Start executing the main firmware.
> + */
> +enum ish_loader_commands {
> +	LOADER_CMD_XFER_QUERY = 0,
> +	LOADER_CMD_XFER_FRAGMENT,
> +	LOADER_CMD_START,
> +};
> +
> +/* Command bit mask */
> +#define	CMD_MASK				GENMASK(6, 0)
> +#define	IS_RESPONSE				BIT(7)
> +
> +/*
> + * ISH firmware max delay for one transmit failure is 1 Hz,
> + * and firmware will retry 2 times, so 3 Hz is used for timeout.
> + */
> +#define ISHTP_SEND_TIMEOUT			(3 * HZ)
> +
> +/*
> + * Loader transfer modes:
> + *
> + * LOADER_XFER_MODE_ISHTP mode uses the existing ISH-TP mechanims to
> + * transfer data. This may use IPC or DMA if supported in firmware.
> + * The buffer size is limited to 4 Kb by the IPC/ISH-TP protocol for
> + * both IPC & DMA (legacy).
> + *
> + * LOADER_XFER_MODE_DIRECT_DMA - firmware loading is a bit different
> + * from the sensor data streaming. Here we download a large (300+
> Kb)
> + * image directly to ISH SRAM memory. There is limited benefit of
> + * DMA'ing 300 Kb image in 4 Kb chucks limit. Hence, we introduce
> + * this "direct dma" mode, where we do not use ISH-TP for DMA, but
> + * instead manage the DMA directly in kernel driver and Shim
> firmware
> + * loader (allocate buf, break in chucks and transfer). This allows
> + * to overcome 4 Kb limit, and optimize the data flow path in
> firmware.
> + */
> +#define LOADER_XFER_MODE_DIRECT_DMA		BIT(0)
> +#define LOADER_XFER_MODE_ISHTP			BIT(1)
> +
> +/* ISH Transport Loader client unique GUID */
> +static const guid_t loader_ishtp_guid =
> +	GUID_INIT(0xc804d06a, 0x55bd, 0x4ea7,
> +		  0xad, 0xed, 0x1e, 0x31, 0x22, 0x8c, 0x76, 0xdc);
> +
> +#define FILENAME_SIZE				256
> +
> +/*
> + * The firmware loading latency will be minimum if we can DMA the
> + * entire ISH firmware image in one go. This requires that we
> allocate
> + * a large DMA buffer in kernel, which could be problematic on some
> + * platforms. So here we limit the DMA buf size via a module_param.
> + * We default to 4 pages, but a customer can set it to higher limit
> if
> + * deemed appropriate for his platform.
> + */
> +static int dma_buf_size_limit = 4 * PAGE_SIZE;
> +
> +/**
> + * struct loader_msg_hdr - Header for ISH Loader commands.
> + * @command:		LOADER_CMD* commands. Bit 7 is the response.
> + * @status:		Command response status. Non 0, is error
> condition.
> + *
> + * This structure is used as header for every command/data
> sent/received
> + * between Host driver and ISH Shim firmware loader.
> + */
> +struct loader_msg_hdr {
> +	u8 command;
> +	u8 reserved[2];
> +	u8 status;
> +} __packed;
> +
> +struct loader_xfer_query {
> +	struct loader_msg_hdr hdr;
> +	u32 image_size;
> +} __packed;
> +
> +struct ish_fw_version {
> +	u16 major;
> +	u16 minor;
> +	u16 hotfix;
> +	u16 build;
> +} __packed;
> +
> +union loader_version {
> +	u32 value;
> +	struct {
> +		u8 major;
> +		u8 minor;
> +		u8 hotfix;
> +		u8 build;
> +	};
> +} __packed;
> +
> +struct loader_capability {
> +	u32 max_fw_image_size;
> +	u32 xfer_mode;
> +	u32 max_dma_buf_size; /* only for dma mode, multiples of
> cacheline */
> +} __packed;
> +
> +struct shim_fw_info {
> +	struct ish_fw_version ish_fw_version;
> +	u32 protocol_version;
> +	union loader_version ldr_version;
> +	struct loader_capability ldr_capability;
> +} __packed;
> +
> +struct loader_xfer_query_response {
> +	struct loader_msg_hdr hdr;
> +	struct shim_fw_info fw_info;
> +} __packed;
> +
> +struct loader_xfer_fragment {
> +	struct loader_msg_hdr hdr;
> +	u32 xfer_mode;
> +	u32 offset;
> +	u32 size;
> +	u32 is_last;
> +} __packed;
> +
> +struct loader_xfer_ipc_fragment {
> +	struct loader_xfer_fragment fragment;
> +	u8 data[] ____cacheline_aligned; /* variable length payload
> here */
> +} __packed;
> +
> +struct loader_xfer_dma_fragment {
> +	struct loader_xfer_fragment fragment;
> +	u64 ddr_phys_addr;
> +} __packed;
> +
> +struct loader_start {
> +	struct loader_msg_hdr hdr;
> +} __packed;
> +
> +/**
> + * struct ishtp_cl_data - Encapsulate per ISH-TP Client Data
> + * @flag_response	Set true on receiving a firmware  response to
> host
> + *			loader command
> + * @cmd_resp_wait:	Wait queue for Host firmware loading, where the
> + *			client sends message to ISH firmware and wait
> for
> + *			response
> + * @work_ishtp_reset:	Work queue for reset handling
> + * @work_fw_load:	Work queue for host firmware loading
> + * @flag_retry		Flag for indicating host firmware
> loading should be
> + *			retried
> + * @bad_recv_cnt:	Running count of packets received with error
> + *
> + * This structure is used to store data per client
> + */
> +struct ishtp_cl_data {
> +	struct ishtp_cl *loader_ishtp_cl;
> +	struct ishtp_cl_device *cl_device;
> +
> +	/* Completion flags */
> +	bool flag_response;
> +
> +	/* Copy buffer received in firmware "response" here */
> +	void *response_data;
> +	size_t response_size;
> +
> +	/* Wait queue for ISH firmware message event */
> +	wait_queue_head_t cmd_resp_wait;
> +
> +	struct work_struct work_ishtp_reset;
> +	struct work_struct work_fw_load;
> +
> +	/*
> +	 * In certain failure scenrios, it makes sense to reset the
> +	 * the ISH subsystem and retry Host firmware loading
> +	 * (e.g. bad message packet, ENOMEM, etc.)
> +	 * On the other hand, failures due to protocol mismatch, etc
> +	 * are not recoverable. We do not retry.
> +	 *
> +	 * If set, the flag indictes that we should re-try the
> particular
> +	 * failure.
> +	 */
> +	bool flag_retry;
> +
> +	/* Statistics */
> +	unsigned int bad_recv_cnt;
> +};
> +
> +#define IPC_FRAGMENT_DATA_PREAMBLE				\
> +	offsetof(struct loader_xfer_ipc_fragment, data)
> +
> +#define cl_data_to_dev(client_data) ishtp_device((client_data)-
> >cl_device)
> +
> +/**
> + * get_firmware_variant() - Gets the filename of firmware image to
> be
> + *			loaded based on platform variant.
> + * @client_data		Client data instance.
> + * @filename		Returns firmware filename.
> + *
> + * Queries the firmware-name device property string.
> + *
> + * Return: 0 for success, negative error code for failure.
> + */
> +static int get_firmware_variant(struct ishtp_cl_data *client_data,
> +				char *filename)
> +{
> +	int rv;
> +	const char *val;
> +	struct device *devc = ishtp_get_pci_device(client_data-
> >cl_device);
> +
> +	rv = device_property_read_string(devc, "firmware-name", &val);
> +	if (rv < 0) {
> +		dev_err(devc,
> +			"Error: ISH firmware-name device property
> required\n");
> +		return rv;
> +	}
> +	return snprintf(filename, FILENAME_SIZE, "intel/%s", val);
> +}
> +
> +/**
> + * report_bad_packets() Report bad packets
> + * @loader_ishtp_cl:	Client instance to get stats
> + * @recv_buf:		Raw received host interface message
> + *
> + * Dumps error in case bad packet is received
> + */
> +static void report_bad_packet(struct ishtp_cl *loader_ishtp_cl,
> +			      void *recv_buf)
> +{
> +	struct loader_msg_hdr *hdr = recv_buf;
> +	struct ishtp_cl_data *client_data =
> +		ishtp_get_client_data(loader_ishtp_cl);
> +
> +	client_data->bad_recv_cnt++;
> +	dev_err(cl_data_to_dev(client_data),
> +		"BAD packet: command=%02lx is_response=%u status=%02x
> total_bad=%u\n",
> +		hdr->command & CMD_MASK,
> +		hdr->command & IS_RESPONSE ? 1 : 0,
> +		hdr->status,
> +		client_data->bad_recv_cnt);
> +}
> +
> +/**
> + * loader_ish_hw_reset() - Reset ISH HW in bad state
> + * @loader_ishtp_cl	Client instance to reset
> + *
> + * This function resets ISH hardware, which shall reload
> + * the Shim firmware loader, initiate ISH-TP interface reset,
> + * re-attach kernel loader driver, and repeat Host
> + * firmware load.
> + */
> +static inline void loader_ish_hw_reset(struct ishtp_cl
> *loader_ishtp_cl)
> +{
> +	struct ishtp_cl_data *client_data =
> +		ishtp_get_client_data(loader_ishtp_cl);
> +
> +	dev_warn(cl_data_to_dev(client_data), "Reset the ISH
> subsystem\n");
> +	ish_hw_reset(ishtp_get_ishtp_device(loader_ishtp_cl));
> +}
> +
> +/**
> + * loader_cl_send()	Send message from host to firmware
> + * @client_data:	Client data instance
> + * @msg			Message buffer to send
> + * @msg_size		Size of message
> + *
> + * Return: Received buffer size on success, negative error code on
> failure.
> + */
> +static int loader_cl_send(struct ishtp_cl_data *client_data,
> +			  u8 *msg, size_t msg_size)
> +{
> +	int rv;
> +	size_t data_len;
> +	struct loader_msg_hdr *in_hdr;
> +	struct loader_msg_hdr *out_hdr = (struct loader_msg_hdr *)msg;
> +	struct ishtp_cl *loader_ishtp_cl = client_data-
> >loader_ishtp_cl;
> +
> +	dev_dbg(cl_data_to_dev(client_data),
> +		"%s: command=%02lx is_response=%u status=%02x\n",
> +		__func__,
> +		out_hdr->command & CMD_MASK,
> +		out_hdr->command & IS_RESPONSE ? 1 : 0,
> +		out_hdr->status);
> +
> +	client_data->flag_response = false;
> +	rv = ishtp_cl_send(loader_ishtp_cl, msg, msg_size);
> +	if (rv < 0) {
> +		dev_err(cl_data_to_dev(client_data),
> +			"ishtp_cl_send error %d\n", rv);
> +		return rv;
> +	}
> +
> +	wait_event_interruptible_timeout(client_data->cmd_resp_wait,
> +					 client_data->flag_response,
> +					 ISHTP_SEND_TIMEOUT);
> +	if (!client_data->flag_response) {
> +		dev_err(cl_data_to_dev(client_data),
> +			"Timed out for response to command=%02lx",
> +			out_hdr->command & CMD_MASK);
> +		return -ETIMEDOUT;
> +	}
> +
> +	/* All response messages will contain a header */
> +	data_len = client_data->response_size;
> +	in_hdr = (struct loader_msg_hdr *)client_data->response_data;
> +
> +	/* Sanity checks */
> +	if (!(in_hdr->command & IS_RESPONSE)) {
> +		dev_err(cl_data_to_dev(client_data),
> +			"Invalid response to command\n");
> +		return -EIO;
> +	}
> +
> +	if (in_hdr->status) {
> +		dev_err(cl_data_to_dev(client_data),
> +			"Loader returned status %d\n",
> +			in_hdr->status);
> +		return -EIO;
> +	}
> +
> +	return data_len;
> +}
> +
> +/**
> + * process_recv() -	Receive and parse incoming packet
> + * @loader_ishtp_cl:	Client instance to get stats
> + * @rb_in_proc:		ISH received message buffer
> + *
> + * Parse the incoming packet. If it is a response packet then it
> will
> + * update flag_response and wake up the caller waiting to for the
> response.
> + */
> +static void process_recv(struct ishtp_cl *loader_ishtp_cl,
> +			 struct ishtp_cl_rb *rb_in_proc)
> +{
> +	size_t data_len = rb_in_proc->buf_idx;
> +	struct loader_msg_hdr *hdr =
> +		(struct loader_msg_hdr *)rb_in_proc->buffer.data;
> +	struct ishtp_cl_data *client_data =
> +		ishtp_get_client_data(loader_ishtp_cl);
> +
> +	/*
> +	 * All firmware messages have a header. Check buffer size
> +	 * before accessing elements inside.
> +	 */
> +	if (data_len < sizeof(struct loader_msg_hdr)) {
> +		dev_err(cl_data_to_dev(client_data),
> +			"data size %zu is less than header %zu\n",
> +			data_len, sizeof(struct loader_msg_hdr));
> +		report_bad_packet(client_data->loader_ishtp_cl, hdr);
> +		goto end_error;
> +	}
> +
> +	dev_dbg(cl_data_to_dev(client_data),
> +		"%s: command=%02lx is_response=%u status=%02x\n",
> +		__func__,
> +		hdr->command & CMD_MASK,
> +		hdr->command & IS_RESPONSE ? 1 : 0,
> +		hdr->status);
> +
> +	switch (hdr->command & CMD_MASK) {
> +	case LOADER_CMD_XFER_QUERY:
> +	case LOADER_CMD_XFER_FRAGMENT:
> +	case LOADER_CMD_START:
> +		/* Sanity check */
> +		if (client_data->response_data || client_data-
> >flag_response) {
> +			dev_err(cl_data_to_dev(client_data),
> +				"Buffer overrun: previous firmware
> message not yet processed\n");
> +			report_bad_packet(client_data->loader_ishtp_cl, 
> hdr);
> +			break;
> +		}
> +
> +		/*
> +		 * Copy the buffer received in firmware response for
> the
> +		 * calling thread.
> +		 */
> +		client_data->response_data = kmalloc(data_len,
> GFP_KERNEL);
> +		if (!client_data->response_data)
> +			break;
> +
> +		memcpy(client_data->response_data,
> +		       rb_in_proc->buffer.data, data_len);
> +		client_data->response_size = data_len;
> +
> +		/* Free the buffer */
> +		ishtp_cl_io_rb_recycle(rb_in_proc);
> +		rb_in_proc = NULL;
> +
> +		/* Wake the calling thread */
> +		client_data->flag_response = true;
> +		wake_up_interruptible(&client_data->cmd_resp_wait);
> +		break;
> +
> +	default:
> +		dev_err(cl_data_to_dev(client_data),
> +			"Invalid command=%02lx\n",
> +			hdr->command & CMD_MASK);
> +		report_bad_packet(client_data->loader_ishtp_cl, hdr);
> +	}
> +
> +end_error:
> +	/* Free the buffer if we did not do above */
> +	if (rb_in_proc)
> +		ishtp_cl_io_rb_recycle(rb_in_proc);
> +}
> +
> +/**
> + * loader_cl_event_cb() - bus driver callback for incoming message
> + * @device:		Pointer to the the ishtp client device for
> which
> + *			this message is targeted
> + *
> + * Remove the packet from the list and process the message by
> calling
> + * process_recv
> + */
> +static void loader_cl_event_cb(struct ishtp_cl_device *cl_device)
> +{
> +	struct ishtp_cl_rb *rb_in_proc;
> +	struct ishtp_cl_data *client_data;
> +	struct ishtp_cl	*loader_ishtp_cl =
> ishtp_get_drvdata(cl_device);
> +
> +	client_data = ishtp_get_client_data(loader_ishtp_cl);
> +
> +	while ((rb_in_proc = ishtp_cl_rx_get_rb(loader_ishtp_cl)) !=
> NULL) {
> +		if (!rb_in_proc->buffer.data) {
> +			dev_warn(cl_data_to_dev(client_data),
> +				 "rb_in_proc->buffer.data returned
> null");
> +			continue;
> +		}
> +
> +		/* Process the data packet from firmware */
> +		process_recv(loader_ishtp_cl, rb_in_proc);
> +	}
> +}
> +
> +/**
> + * ish_query_loader_prop() -  Query ISH Shim firmware loader
> + * @client_data:	Client data instance
> + * @fw:			Poiner to fw data struct in host memory
> + *
> + * This function queries the ISH Shim firmware loader for
> capabilities.
> + *
> + * Return: 0 for success, negative error code for failure.
> + */
> +static int ish_query_loader_prop(struct ishtp_cl_data *client_data,
> +				 const struct firmware *fw,
> +				 struct shim_fw_info *fw_info)
> +{
> +	int rv;
> +	size_t data_len;
> +	struct loader_msg_hdr *hdr;
> +	struct loader_xfer_query ldr_xfer_query;
> +	struct loader_xfer_query_response *ldr_xfer_query_resp;
> +
> +	memset(&ldr_xfer_query, 0, sizeof(ldr_xfer_query));
> +	ldr_xfer_query.hdr.command = LOADER_CMD_XFER_QUERY;
> +	ldr_xfer_query.image_size = fw->size;
> +	rv = loader_cl_send(client_data,
> +			    (u8 *)&ldr_xfer_query,
> +			    sizeof(ldr_xfer_query));
> +	if (rv < 0) {
> +		client_data->flag_retry = true;
> +		goto end_error;
> +	}
> +
> +	/* Check buffer size before accessing the elements */
> +	data_len = client_data->response_size;
> +	if (data_len != sizeof(struct loader_xfer_query_response)) {
> +		dev_err(cl_data_to_dev(client_data),
> +			"data size %zu is not equal to size of
> loader_xfer_query_response %zu\n",
> +			data_len, sizeof(struct
> loader_xfer_query_response));
> +		hdr = (struct loader_msg_hdr *)client_data-
> >response_data;
> +		report_bad_packet(client_data->loader_ishtp_cl, hdr);
> +		client_data->flag_retry = true;
> +		rv = -EMSGSIZE;
> +		goto end_error;
> +	}
> +
> +	/* Save fw_info for use outside this function */
> +	ldr_xfer_query_resp =
> +		(struct loader_xfer_query_response *)client_data-
> >response_data;
> +	*fw_info = ldr_xfer_query_resp->fw_info;
> +
> +	/* Loader firmware properties */
> +	dev_dbg(cl_data_to_dev(client_data),
> +		"ish_fw_version: major=%d minor=%d hotfix=%d build=%d
> protocol_version=0x%x loader_version=%d\n",
> +		fw_info->ish_fw_version.major,
> +		fw_info->ish_fw_version.minor,
> +		fw_info->ish_fw_version.hotfix,
> +		fw_info->ish_fw_version.build,
> +		fw_info->protocol_version,
> +		fw_info->ldr_version.value);
> +
> +	dev_dbg(cl_data_to_dev(client_data),
> +		"loader_capability: max_fw_image_size=0x%x xfer_mode=%d
> max_dma_buf_size=0x%x dma_buf_size_limit=0x%x\n",
> +		fw_info->ldr_capability.max_fw_image_size,
> +		fw_info->ldr_capability.xfer_mode,
> +		fw_info->ldr_capability.max_dma_buf_size,
> +		dma_buf_size_limit);
> +
> +	/* Sanity checks */
> +	if (fw_info->ldr_capability.max_fw_image_size < fw->size) {
> +		dev_err(cl_data_to_dev(client_data),
> +			"ISH firmware size %zu is greater than Shim
> firmware loader max supported %d\n",
> +			fw->size,
> +			fw_info->ldr_capability.max_fw_image_size);
> +		rv = -ENOSPC;
> +		goto end_error;
> +	}
> +
> +	/* For DMA the buffer size should be multiple of cacheline size
> */
> +	if ((fw_info->ldr_capability.xfer_mode &
> LOADER_XFER_MODE_DIRECT_DMA) &&
> +	    (fw_info->ldr_capability.max_dma_buf_size %
> L1_CACHE_BYTES)) {
> +		dev_err(cl_data_to_dev(client_data),
> +			"Shim firmware loader buffer size %d should be
> multipe of cacheline\n",
> +			fw_info->ldr_capability.max_dma_buf_size);
> +		rv = -EINVAL;
> +		goto end_error;
> +	}
> +
> +end_error:
> +	/* Free ISH buffer if not done so in error case */
> +	kfree(client_data->response_data);
> +	client_data->response_data = NULL;
> +	return rv;
> +}
> +
> +/**
> + * ish_fw_xfer_ishtp()	Loads ISH firmware using ishtp
> interface
> + * @client_data:	Client data instance
> + * @fw:			Pointer to fw data struct in host
> memory
> + *
> + * This function uses ISH-TP to transfer ISH firmware from host to
> + * ISH SRAM. Lower layers may use IPC or DMA depending on firmware
> + * support.
> + *
> + * Return: 0 for success, negative error code for failure.
> + */
> +static int ish_fw_xfer_ishtp(struct ishtp_cl_data *client_data,
> +			     const struct firmware *fw)
> +{
> +	int rv;
> +	u32 fragment_offset, fragment_size, payload_max_size;
> +	struct loader_xfer_ipc_fragment *ldr_xfer_ipc_frag;
> +
> +	payload_max_size =
> +		LOADER_SHIM_IPC_BUF_SIZE - IPC_FRAGMENT_DATA_PREAMBLE;
> +
> +	ldr_xfer_ipc_frag = kzalloc(LOADER_SHIM_IPC_BUF_SIZE,
> GFP_KERNEL);
> +	if (!ldr_xfer_ipc_frag) {
> +		client_data->flag_retry = true;
> +		return -ENOMEM;
> +	}
> +
> +	ldr_xfer_ipc_frag->fragment.hdr.command =
> LOADER_CMD_XFER_FRAGMENT;
> +	ldr_xfer_ipc_frag->fragment.xfer_mode = LOADER_XFER_MODE_ISHTP;
> +
> +	/* Break the firmware image into fragments and send as ISH-TP
> payload */
> +	fragment_offset = 0;
> +	while (fragment_offset < fw->size) {
> +		if (fragment_offset + payload_max_size < fw->size) {
> +			fragment_size = payload_max_size;
> +			ldr_xfer_ipc_frag->fragment.is_last = 0;
> +		} else {
> +			fragment_size = fw->size - fragment_offset;
> +			ldr_xfer_ipc_frag->fragment.is_last = 1;
> +		}
> +
> +		ldr_xfer_ipc_frag->fragment.offset = fragment_offset;
> +		ldr_xfer_ipc_frag->fragment.size = fragment_size;
> +		memcpy(ldr_xfer_ipc_frag->data,
> +		       &fw->data[fragment_offset],
> +		       fragment_size);
> +
> +		dev_dbg(cl_data_to_dev(client_data),
> +			"xfer_mode=ipc offset=0x%08x size=0x%08x
> is_last=%d\n",
> +			ldr_xfer_ipc_frag->fragment.offset,
> +			ldr_xfer_ipc_frag->fragment.size,
> +			ldr_xfer_ipc_frag->fragment.is_last);
> +
> +		rv = loader_cl_send(client_data,
> +				    (u8 *)ldr_xfer_ipc_frag,
> +				    IPC_FRAGMENT_DATA_PREAMBLE +
> fragment_size);
> +		if (rv < 0) {
> +			client_data->flag_retry = true;
> +			goto end_err_resp_buf_release;
> +		}
> +
> +		/* Free ISH buffer once response is processed */
> +		kfree(client_data->response_data);
> +		client_data->response_data = NULL;
> +
> +		fragment_offset += fragment_size;
> +	}
> +
> +	kfree(ldr_xfer_ipc_frag);
> +	return 0;
> +
> +end_err_resp_buf_release:
> +	/* Free ISH buffer if not done already, in error case */
> +	kfree(client_data->response_data);
> +	client_data->response_data = NULL;
> +	kfree(ldr_xfer_ipc_frag);
> +	return rv;
> +}
> +
> +/**
> + * ish_fw_xfer_direct_dma() - Loads ISH firmware using direct dma
> + * @client_data:	Client data instance
> + * @fw:			Poiner to fw data struct in host memory
> + *
> + * Host firmware load is a unique case where we need to download
> + * a large firmware image (200+ Kb). This function implements
> + * direct DMA transfer in kernel and ISH firmware. This allows
> + * us to overcome the ISH-TP 4 Kb limit, and allows us to DMA
> + * directly to ISH UMA at location of choice.
> + * Function depends on corresponding support in ISH firmware.
> + *
> + * Return: 0 for success, negative error code for failure.
> + */
> +static int ish_fw_xfer_direct_dma(struct ishtp_cl_data *client_data,
> +				  const struct firmware *fw,
> +				  struct shim_fw_info fw_info)
> +{
> +	int rv;
> +	void *dma_buf;
> +	dma_addr_t dma_buf_phy;
> +	u32 fragment_offset, fragment_size, payload_max_size;
> +	struct loader_xfer_dma_fragment ldr_xfer_dma_frag;
> +	struct device *devc = ishtp_get_pci_device(client_data-
> >cl_device);
> +	u32 shim_fw_buf_size =
> +		fw_info.ldr_capability.max_dma_buf_size;
> +
> +	/*
> +	 * payload_max_size should be set to minimum of
> +	 *  (1) Size of firmware to be loaded,
> +	 *  (2) Max DMA buf size supported by Shim firmware,
> +	 *  (3) DMA buffer size limit set by boot_param
> dma_buf_size_limit.
> +	 */
> +	payload_max_size = min3(fw->size,
> +				(size_t)shim_fw_buf_size,
> +				(size_t)dma_buf_size_limit);
> +
> +	/*
> +	 * Buffer size should be multiple of cacheline size
> +	 * if it's not, select the previous cacheline boundary.
> +	 */
> +	payload_max_size &= ~(L1_CACHE_BYTES - 1);
> +
> +	dma_buf = kmalloc(payload_max_size, GFP_KERNEL | GFP_DMA32);
> +	if (!dma_buf) {
> +		client_data->flag_retry = true;
> +		return -ENOMEM;
> +	}
> +
> +	dma_buf_phy = dma_map_single(devc, dma_buf, payload_max_size,
> +				     DMA_TO_DEVICE);
> +	if (dma_mapping_error(devc, dma_buf_phy)) {
> +		dev_err(cl_data_to_dev(client_data), "DMA map
> failed\n");
> +		client_data->flag_retry = true;
> +		rv = -ENOMEM;
> +		goto end_err_dma_buf_release;
> +	}
> +
> +	ldr_xfer_dma_frag.fragment.hdr.command =
> LOADER_CMD_XFER_FRAGMENT;
> +	ldr_xfer_dma_frag.fragment.xfer_mode =
> LOADER_XFER_MODE_DIRECT_DMA;
> +	ldr_xfer_dma_frag.ddr_phys_addr = (u64)dma_buf_phy;
> +
> +	/* Send the firmware image in chucks of payload_max_size */
> +	fragment_offset = 0;
> +	while (fragment_offset < fw->size) {
> +		if (fragment_offset + payload_max_size < fw->size) {
> +			fragment_size = payload_max_size;
> +			ldr_xfer_dma_frag.fragment.is_last = 0;
> +		} else {
> +			fragment_size = fw->size - fragment_offset;
> +			ldr_xfer_dma_frag.fragment.is_last = 1;
> +		}
> +
> +		ldr_xfer_dma_frag.fragment.offset = fragment_offset;
> +		ldr_xfer_dma_frag.fragment.size = fragment_size;
> +		memcpy(dma_buf, &fw->data[fragment_offset],
> fragment_size);
> +
> +		dma_sync_single_for_device(devc, dma_buf_phy,
> +					   payload_max_size,
> +					   DMA_TO_DEVICE);
> +
> +		/*
> +		 * Flush cache here because the
> dma_sync_single_for_device()
> +		 * does not do for x86.
> +		 */
> +		clflush_cache_range(dma_buf, payload_max_size);
> +
> +		dev_dbg(cl_data_to_dev(client_data),
> +			"xfer_mode=dma offset=0x%08x size=0x%x
> is_last=%d ddr_phys_addr=0x%016llx\n",
> +			ldr_xfer_dma_frag.fragment.offset,
> +			ldr_xfer_dma_frag.fragment.size,
> +			ldr_xfer_dma_frag.fragment.is_last,
> +			ldr_xfer_dma_frag.ddr_phys_addr);
> +
> +		rv = loader_cl_send(client_data,
> +				    (u8 *)&ldr_xfer_dma_frag,
> +				    sizeof(ldr_xfer_dma_frag));
> +		if (rv < 0) {
> +			client_data->flag_retry = true;
> +			goto end_err_resp_buf_release;
> +		}
> +
> +		/* Free ISH buffer once response is processed */
> +		kfree(client_data->response_data);
> +		client_data->response_data = NULL;
> +
> +		fragment_offset += fragment_size;
> +	}
> +
> +	dma_unmap_single(devc, dma_buf_phy, payload_max_size,
> DMA_TO_DEVICE);
> +	kfree(dma_buf);
> +	return 0;
> +
> +end_err_resp_buf_release:
> +	/* Free ISH buffer if not done already, in error case */
> +	kfree(client_data->response_data);
> +	client_data->response_data = NULL;
> +	dma_unmap_single(devc, dma_buf_phy, payload_max_size,
> DMA_TO_DEVICE);
> +end_err_dma_buf_release:
> +	kfree(dma_buf);
> +	return rv;
> +}
> +
> +/**
> + * ish_fw_start()	Start executing ISH main firmware
> + * @client_data:	client data instance
> + *
> + * This function sends message to Shim firmware loader to start
> + * the execution of ISH main firmware.
> + *
> + * Return: 0 for success, negative error code for failure.
> + */
> +static int ish_fw_start(struct ishtp_cl_data *client_data)
> +{
> +	int rv;
> +	struct loader_start ldr_start;
> +
> +	memset(&ldr_start, 0, sizeof(ldr_start));
> +	ldr_start.hdr.command = LOADER_CMD_START;
> +	rv = loader_cl_send(client_data,
> +			    (u8 *)&ldr_start,
> +			    sizeof(ldr_start));
> +
> +	/* Free ISH buffer once response is processed */
> +	kfree(client_data->response_data);
> +	client_data->response_data = NULL;
> +	return rv;
> +}
> +
> +/**
> + * load_fw_from_host()	Loads ISH firmware from host
> + * @client_data:	Client data instance
> + *
> + * This function loads the ISH firmware to ISH sram and starts
> execution
> + *
> + * Return: 0 for success, negative error code for failure.
> + */
> +static int load_fw_from_host(struct ishtp_cl_data *client_data)
> +{
> +	int rv;
> +	u32 xfer_mode;
> +	char *filename;
> +	const struct firmware *fw;
> +	struct shim_fw_info fw_info;
> +
> +	client_data->flag_retry = false;
> +
> +	filename = kzalloc(FILENAME_SIZE, GFP_KERNEL);
> +	if (!filename) {
> +		rv = -ENOMEM;
> +		goto end_error;
> +	}
> +
> +	/* Get filename of the ISH firmware to be loaded */
> +	rv = get_firmware_variant(client_data, filename);
> +	if (rv < 0)
> +		goto end_err_filename_buf_release;
> +
> +	rv = request_firmware(&fw, filename,
> cl_data_to_dev(client_data));
> +	if (rv < 0)
> +		goto end_err_filename_buf_release;
> +
> +	/* Step 1: Query Shim firmware loader properties */
> +
> +	rv = ish_query_loader_prop(client_data, fw, &fw_info);
> +	if (rv < 0)
> +		goto end_err_fw_release;
> +
> +	/* Step 2: Send the main firmware image to be loaded, to ISH
> sram */
> +
> +	xfer_mode = fw_info.ldr_capability.xfer_mode;
> +	if (xfer_mode & LOADER_XFER_MODE_DIRECT_DMA) {
> +		rv = ish_fw_xfer_direct_dma(client_data, fw, fw_info);
> +	} else if (xfer_mode & LOADER_XFER_MODE_ISHTP) {
> +		rv = ish_fw_xfer_ishtp(client_data, fw);
> +	} else {
> +		dev_err(cl_data_to_dev(client_data),
> +			"No transfer mode selected in firmware\n");
> +		rv = -EINVAL;
> +	}
> +	if (rv < 0)
> +		goto end_err_fw_release;
> +
> +	/* Step 3: Start ISH main firmware exeuction */
> +
> +	rv = ish_fw_start(client_data);
> +	if (rv < 0)
> +		goto end_err_fw_release;
> +
> +	release_firmware(fw);
> +	kfree(filename);
> +	dev_info(cl_data_to_dev(client_data), "ISH firmware %s
> loaded\n",
> +		 filename);
> +	return 0;
> +
> +end_err_fw_release:
> +	release_firmware(fw);
> +end_err_filename_buf_release:
> +	kfree(filename);
> +end_error:
> +	if (client_data->flag_retry) {
> +		dev_warn(cl_data_to_dev(client_data),
> +			 "ISH host firmware load failed %d. Reset ISH &
> try again..\n",
> +			 rv);
> +		loader_ish_hw_reset(client_data->loader_ishtp_cl);
> +	} else {
> +		dev_err(cl_data_to_dev(client_data),
> +			"ISH host firmware load failed %d\n", rv);
> +	}
> +	return rv;
> +}
> +
> +static void load_fw_from_host_handler(struct work_struct *work)
> +{
> +	struct ishtp_cl_data *client_data;
> +
> +	client_data = container_of(work, struct ishtp_cl_data,
> +				   work_fw_load);
> +	load_fw_from_host(client_data);
> +}
> +
> +/**
> + * loader_init() -	Init function for ISH-TP client
> + * @loader_ishtp_cl:	ISH-TP client instance
> + * @reset:		true if called for init after reset
> + *
> + * Return: 0 for success, negative error code for failure
> + */
> +static int loader_init(struct ishtp_cl *loader_ishtp_cl, int reset)
> +{
> +	int rv;
> +	struct ishtp_fw_client *fw_client;
> +	struct ishtp_cl_data *client_data =
> +		ishtp_get_client_data(loader_ishtp_cl);
> +
> +	dev_dbg(cl_data_to_dev(client_data), "reset flag: %d\n",
> reset);
> +
> +	rv = ishtp_cl_link(loader_ishtp_cl);
> +	if (rv < 0) {
> +		dev_err(cl_data_to_dev(client_data), "ishtp_cl_link
> failed\n");
> +		return rv;
> +	}
> +
> +	/* Connect to firmware client */
> +	ishtp_set_tx_ring_size(loader_ishtp_cl,
> LOADER_CL_TX_RING_SIZE);
> +	ishtp_set_rx_ring_size(loader_ishtp_cl,
> LOADER_CL_RX_RING_SIZE);
> +
> +	fw_client =
> +		ishtp_fw_cl_get_client(ishtp_get_ishtp_device(loader_is
> htp_cl),
> +				       &loader_ishtp_guid);
> +	if (!fw_client) {
> +		dev_err(cl_data_to_dev(client_data),
> +			"ISH client uuid not found\n");
> +		rv = -ENOENT;
> +		goto err_cl_unlink;
> +	}
> +
> +	ishtp_cl_set_fw_client_id(loader_ishtp_cl,
> +				  ishtp_get_fw_client_id(fw_client));
> +	ishtp_set_connection_state(loader_ishtp_cl,
> ISHTP_CL_CONNECTING);
> +
> +	rv = ishtp_cl_connect(loader_ishtp_cl);
> +	if (rv < 0) {
> +		dev_err(cl_data_to_dev(client_data), "Client connect
> fail\n");
> +		goto err_cl_unlink;
> +	}
> +
> +	dev_dbg(cl_data_to_dev(client_data), "Client connected\n");
> +
> +	ishtp_register_event_cb(client_data->cl_device,
> loader_cl_event_cb);
> +
> +	return 0;
> +
> +err_cl_unlink:
> +	ishtp_cl_unlink(loader_ishtp_cl);
> +	return rv;
> +}
> +
> +static void loader_deinit(struct ishtp_cl *loader_ishtp_cl)
> +{
> +	ishtp_set_connection_state(loader_ishtp_cl,
> ISHTP_CL_DISCONNECTING);
> +	ishtp_cl_disconnect(loader_ishtp_cl);
> +	ishtp_cl_unlink(loader_ishtp_cl);
> +	ishtp_cl_flush_queues(loader_ishtp_cl);
> +
> +	/* Disband and free all Tx and Rx client-level rings */
> +	ishtp_cl_free(loader_ishtp_cl);
> +}
> +
> +static void reset_handler(struct work_struct *work)
> +{
> +	int rv;
> +	struct ishtp_cl_data *client_data;
> +	struct ishtp_cl *loader_ishtp_cl;
> +	struct ishtp_cl_device *cl_device;
> +
> +	client_data = container_of(work, struct ishtp_cl_data,
> +				   work_ishtp_reset);
> +
> +	loader_ishtp_cl = client_data->loader_ishtp_cl;
> +	cl_device = client_data->cl_device;
> +
> +	/* Unlink, flush queues & start again */
> +	ishtp_cl_unlink(loader_ishtp_cl);
> +	ishtp_cl_flush_queues(loader_ishtp_cl);
> +	ishtp_cl_free(loader_ishtp_cl);
> +
> +	loader_ishtp_cl = ishtp_cl_allocate(cl_device);
> +	if (!loader_ishtp_cl)
> +		return;
> +
> +	ishtp_set_drvdata(cl_device, loader_ishtp_cl);
> +	ishtp_set_client_data(loader_ishtp_cl, client_data);
> +	client_data->loader_ishtp_cl = loader_ishtp_cl;
> +	client_data->cl_device = cl_device;
> +
> +	rv = loader_init(loader_ishtp_cl, 1);
> +	if (rv < 0) {
> +		dev_err(ishtp_device(cl_device), "Reset Failed\n");
> +		return;
> +	}
> +
> +	/* ISH firmware loading from host */
> +	load_fw_from_host(client_data);
> +}
> +
> +/**
> + * loader_ishtp_cl_probe() - ISH-TP client driver probe
> + * @cl_device:		ISH-TP client device instance
> + *
> + * This function gets called on device create on ISH-TP bus
> + *
> + * Return: 0 for success, negative error code for failure
> + */
> +static int loader_ishtp_cl_probe(struct ishtp_cl_device *cl_device)
> +{
> +	struct ishtp_cl *loader_ishtp_cl;
> +	struct ishtp_cl_data *client_data;
> +	int rv;
> +
> +	client_data = devm_kzalloc(ishtp_device(cl_device),
> +				   sizeof(*client_data),
> +				   GFP_KERNEL);
> +	if (!client_data)
> +		return -ENOMEM;
> +
> +	loader_ishtp_cl = ishtp_cl_allocate(cl_device);
> +	if (!loader_ishtp_cl)
> +		return -ENOMEM;
> +
> +	ishtp_set_drvdata(cl_device, loader_ishtp_cl);
> +	ishtp_set_client_data(loader_ishtp_cl, client_data);
> +	client_data->loader_ishtp_cl = loader_ishtp_cl;
> +	client_data->cl_device = cl_device;
> +
> +	init_waitqueue_head(&client_data->cmd_resp_wait);
> +
> +	INIT_WORK(&client_data->work_ishtp_reset,
> +		  reset_handler);
> +	INIT_WORK(&client_data->work_fw_load,
> +		  load_fw_from_host_handler);
> +
> +	rv = loader_init(loader_ishtp_cl, 0);
> +	if (rv < 0) {
> +		ishtp_cl_free(loader_ishtp_cl);
> +		return rv;
> +	}
> +	ishtp_get_device(cl_device);
> +
> +	/* ISH firmware loading from host */
> +	schedule_work(&client_data->work_fw_load);
> +
> +	return 0;
> +}
> +
> +/**
> + * loader_ishtp_cl_remove() - ISH-TP client driver remove
> + * @cl_device:		ISH-TP client device instance
> + *
> + * This function gets called on device remove on ISH-TP bus
> + *
> + * Return: 0
> + */
> +static int loader_ishtp_cl_remove(struct ishtp_cl_device *cl_device)
> +{
> +	struct ishtp_cl_data *client_data;
> +	struct ishtp_cl	*loader_ishtp_cl =
> ishtp_get_drvdata(cl_device);
> +
> +	client_data = ishtp_get_client_data(loader_ishtp_cl);
> +
> +	/*
> +	 * The sequence of the following two cancel_work_sync() is
> +	 * important. The work_fw_load can in turn schedue
> +	 * work_ishtp_reset, so first cancel work_fw_load then
> +	 * cancel work_ishtp_reset.
> +	 */
> +	cancel_work_sync(&client_data->work_fw_load);
> +	cancel_work_sync(&client_data->work_ishtp_reset);
> +	loader_deinit(loader_ishtp_cl);
> +	ishtp_put_device(cl_device);
> +
> +	return 0;
> +}
> +
> +/**
> + * loader_ishtp_cl_reset() - ISH-TP client driver reset
> + * @cl_device:		ISH-TP client device instance
> + *
> + * This function gets called on device reset on ISH-TP bus
> + *
> + * Return: 0
> + */
> +static int loader_ishtp_cl_reset(struct ishtp_cl_device *cl_device)
> +{
> +	struct ishtp_cl_data *client_data;
> +	struct ishtp_cl	*loader_ishtp_cl =
> ishtp_get_drvdata(cl_device);
> +
> +	client_data = ishtp_get_client_data(loader_ishtp_cl);
> +
> +	schedule_work(&client_data->work_ishtp_reset);
> +
> +	return 0;
> +}
> +
> +static struct ishtp_cl_driver	loader_ishtp_cl_driver = {
> +	.name = "ish-loader",
> +	.guid = &loader_ishtp_guid,
> +	.probe = loader_ishtp_cl_probe,
> +	.remove = loader_ishtp_cl_remove,
> +	.reset = loader_ishtp_cl_reset,
> +};
> +
> +static int __init ish_loader_init(void)
> +{
> +	return ishtp_cl_driver_register(&loader_ishtp_cl_driver,
> THIS_MODULE);
> +}
> +
> +static void __exit ish_loader_exit(void)
> +{
> +	ishtp_cl_driver_unregister(&loader_ishtp_cl_driver);
> +}
> +
> +late_initcall(ish_loader_init);
> +module_exit(ish_loader_exit);
> +
> +module_param(dma_buf_size_limit, int, 0644);
> +MODULE_PARM_DESC(dma_buf_size_limit, "Limit the DMA buf size to this
> value in bytes");
> +
> +MODULE_DESCRIPTION("ISH ISH-TP Host firmware Loader Client Driver");
> +MODULE_AUTHOR("Rushikesh S Kadam <rushikesh.s.kadam@...el.com>");
> +
> +MODULE_LICENSE("GPL v2");
> +MODULE_ALIAS("ishtp:*");

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