Subject: Re: [PATCH v4 5/5] remoteproc: Add initial zynqmp R5 remoteproc driver

From: Mathieu Poirier <[email-masked]>
Date: Thu, 7 May 2020 16:08:19 -0600

On Fri, Apr 24, 2020 at 10:36:10AM -0700, Ben Levinsky wrote:
> R5 is included in Xilinx Zynq UltraScale MPSoC so by adding this
> remotproc driver, we can boot the R5 sub-system in different
> configurations.
> 
> Acked-by: Stefano Stabellini <[email-masked]>
> Acked-by: Ben Levinsky <[email-masked]>
> Reviewed-by: Radhey Shyam Pandey <[email-masked]>
> Signed-off-by: Ben Levinsky <[email-masked]>
> Signed-off-by: Wendy Liang <[email-masked]>
> Signed-off-by: Michal Simek <[email-masked]>
> Signed-off-by: Ed Mooring <[email-masked]>
> Signed-off-by: Jason Wu <[email-masked]>
> Tested-by: Ben Levinsky <[email-masked]>
> ---
> Changes since v1:
> - remove domain struct as per review from Mathieu
> Changes since v2:
> - add xilinx-related platform mgmt fn's instead of wrapping around
>   function pointer in xilinx eemi ops struct
> Changes since v3:
> - fix formatting from checpatch.pl --strict
> - update commit message
> 
> ---
>  drivers/remoteproc/Kconfig                |  10 +
>  drivers/remoteproc/Makefile               |   1 +
>  drivers/remoteproc/zynqmp_r5_remoteproc.c | 902 ++++++++++++++++++++++++++++++
>  3 files changed, 913 insertions(+)
>  create mode 100644 drivers/remoteproc/zynqmp_r5_remoteproc.c
> 
> diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
> index fbaed07..f094c84 100644
> --- a/drivers/remoteproc/Kconfig
> +++ b/drivers/remoteproc/Kconfig
> @@ -222,6 +222,16 @@ config ST_REMOTEPROC
>  	  processor framework.
>  	  This can be either built-in or a loadable module.
>  
> +config ZYNQMP_R5_REMOTEPROC
> +	tristate "ZynqMP_r5 remoteproc support"
> +	depends on ARM64 && PM && ARCH_ZYNQMP
> +	select RPMSG_VIRTIO
> +	select MAILBOX
> +	select ZYNQMP_IPI_MBOX
> +	help
> +	  Say y here to support ZynqMP R5 remote processors via the remote
> +	  processor framework.
> +
>  config ST_SLIM_REMOTEPROC
>  	tristate
>  
> diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
> index 0effd38..806ac3f 100644
> --- a/drivers/remoteproc/Makefile
> +++ b/drivers/remoteproc/Makefile
> @@ -27,5 +27,6 @@ obj-$(CONFIG_QCOM_WCNSS_PIL)		+= qcom_wcnss_pil.o
>  qcom_wcnss_pil-y			+= qcom_wcnss.o
>  qcom_wcnss_pil-y			+= qcom_wcnss_iris.o
>  obj-$(CONFIG_ST_REMOTEPROC)		+= st_remoteproc.o
> +obj-$(CONFIG_ZYNQMP_R5_REMOTEPROC)	+= zynqmp_r5_remoteproc.o
>  obj-$(CONFIG_ST_SLIM_REMOTEPROC)	+= st_slim_rproc.o
>  obj-$(CONFIG_STM32_RPROC)		+= stm32_rproc.o
> diff --git a/drivers/remoteproc/zynqmp_r5_remoteproc.c b/drivers/remoteproc/zynqmp_r5_remoteproc.c
> new file mode 100644
> index 0000000..e3fb4fb
> --- /dev/null
> +++ b/drivers/remoteproc/zynqmp_r5_remoteproc.c
> @@ -0,0 +1,902 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Zynq R5 Remote Processor driver
> + *
> + * Copyright (C) 2015 - 2018 Xilinx Inc.
> + * Copyright (C) 2015 Jason Wu <[email-masked]>
> + *
> + * Based on origin OMAP and Zynq Remote Processor driver
> + *
> + * Copyright (C) 2012 Michal Simek <[email-masked]>
> + * Copyright (C) 2012 PetaLogix
> + * Copyright (C) 2011 Texas Instruments, Inc.
> + * Copyright (C) 2011 Google, Inc.
> + */
> +
> +#include <linux/atomic.h>
> +#include <linux/cpu.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/delay.h>
> +#include <linux/err.h>
> +#include <linux/firmware/xlnx-zynqmp.h>
> +#include <linux/genalloc.h>
> +#include <linux/idr.h>
> +#include <linux/interrupt.h>
> +#include <linux/kernel.h>
> +#include <linux/list.h>
> +#include <linux/mailbox_client.h>
> +#include <linux/mailbox/zynqmp-ipi-message.h>
> +#include <linux/module.h>
> +#include <linux/of_address.h>
> +#include <linux/of_irq.h>
> +#include <linux/of_platform.h>
> +#include <linux/of_reserved_mem.h>
> +#include <linux/pfn.h>
> +#include <linux/platform_device.h>
> +#include <linux/remoteproc.h>
> +#include <linux/skbuff.h>
> +#include <linux/slab.h>
> +#include <linux/sysfs.h>
> +
> +#include "remoteproc_internal.h"
> +
> +#define MAX_RPROCS	2 /* Support up to 2 RPU */
> +#define MAX_MEM_PNODES	4 /* Max power nodes for one RPU memory instance */
> +
> +#define DEFAULT_FIRMWARE_NAME	"rproc-rpu-fw"
> +
> +/* PM proc states */
> +#define PM_PROC_STATE_ACTIVE 1U
> +
> +/* IPI buffer MAX length */
> +#define IPI_BUF_LEN_MAX	32U
> +/* RX mailbox client buffer max length */
> +#define RX_MBOX_CLIENT_BUF_MAX	(IPI_BUF_LEN_MAX + \
> +				 sizeof(struct zynqmp_ipi_message))
> +
> +static bool autoboot __read_mostly;
> +
> +/**
> + * struct zynqmp_r5_mem - zynqmp rpu memory data
> + * @pnode_id: TCM power domain ids
> + * @res: memory resource
> + * @node: list node
> + */
> +struct zynqmp_r5_mem {
> +	u32 pnode_id[MAX_MEM_PNODES];
> +	struct resource res;
> +	struct list_head node;
> +};
> +
> +/**
> + * struct zynqmp_r5_pdata - zynqmp rpu remote processor private data
> + * @dev: device of RPU instance
> + * @rproc: rproc handle
> + * @pnode_id: RPU CPU power domain id
> + * @mems: memory resources
> + * @is_r5_mode_set: indicate if r5 operation mode is set
> + * @tx_mc: tx mailbox client
> + * @rx_mc: rx mailbox client
> + * @tx_chan: tx mailbox channel
> + * @rx_chan: rx mailbox channel
> + * @workqueue: workqueue for the RPU remoteproc
> + * @tx_mc_skbs: socket buffers for tx mailbox client
> + * @rx_mc_buf: rx mailbox client buffer to save the rx message
> + */
> +struct zynqmp_r5_pdata {
> +	struct device dev;
> +	struct rproc *rproc;
> +	u32 pnode_id;
> +	struct list_head mems;
> +	bool is_r5_mode_set;
> +	struct mbox_client tx_mc;
> +	struct mbox_client rx_mc;
> +	struct mbox_chan *tx_chan;
> +	struct mbox_chan *rx_chan;
> +	struct work_struct workqueue;
> +	struct sk_buff_head tx_mc_skbs;
> +	unsigned char rx_mc_buf[RX_MBOX_CLIENT_BUF_MAX];
> +};
> +
> +/**
> + * table of RPUs
> + */
> +struct zynqmp_r5_pdata rpus[MAX_RPROCS];
> +/**
> + *  RPU core configuration
> + */
> +enum rpu_oper_mode rpu_mode;
> +
> +/*
> + * r5_set_mode - set RPU operation mode
> + * @pdata: Remote processor private data
> + *
> + * set RPU oepration mode
> + *
> + * Return: 0 for success, negative value for failure
> + */
> +static int r5_set_mode(struct zynqmp_r5_pdata *pdata)
> +{
> +	u32 val[PAYLOAD_ARG_CNT] = {0}, expect;
> +	struct device *dev = &pdata->dev;
> +	int ret;
> +
> +	if (pdata->is_r5_mode_set)
> +		return 0;
> +	expect = (u32)rpu_mode;
> +	ret = zynqmp_pm_get_rpu_mode(pdata->pnode_id, 0, 0, val);
> +	if (ret < 0) {
> +		dev_err(dev, "failed to get RPU oper mode.\n");
> +		return ret;
> +	}
> +	if (val[0] == expect) {
> +		dev_dbg(dev, "RPU mode matches: %x\n", val[0]);
> +	} else {
> +		ret = zynqmp_pm_set_rpu_mode(pdata->pnode_id,
> +					     expect, 0, val);
> +		if (ret < 0) {
> +			dev_err(dev,
> +				"failed to set RPU oper mode.\n");
> +			return ret;
> +		}
> +	}
> +	if (expect == (u32)PM_RPU_MODE_LOCKSTEP)
> +		expect = (u32)PM_RPU_TCM_COMB;
> +	else
> +		expect = (u32)PM_RPU_TCM_SPLIT;
> +	ret = zynqmp_pm_set_tcm_config(pdata->pnode_id,
> +				       expect, 0, val);
> +	if (ret < 0) {
> +		dev_err(dev, "failed to config TCM to %x.\n",
> +			expect);
> +		return ret;
> +	}
> +	pdata->is_r5_mode_set = true;
> +	return 0;
> +}
> +
> +/**
> + * r5_is_running - check if r5 is running
> + * @pdata: Remote processor private data
> + *
> + * check if R5 is running
> + *
> + * Return: true if r5 is running, false otherwise
> + */
> +static bool r5_is_running(struct zynqmp_r5_pdata *pdata)
> +{
> +	u32 status, requirements, usage;
> +	struct device *dev = &pdata->dev;
> +
> +	if (zynqmp_pm_get_node_status(pdata->pnode_id,
> +				      &status, &requirements, &usage)) {
> +		dev_err(dev, "Failed to get RPU node %d status.\n",
> +			pdata->pnode_id);
> +		return false;
> +	} else if (status != PM_PROC_STATE_ACTIVE) {
> +		dev_dbg(dev, "RPU is not running.\n");
> +		return false;
> +	}
> +
> +	dev_dbg(dev, "RPU is running.\n");
> +	return true;
> +}
> +
> +/*
> + * ZynqMP R5 remoteproc memory release function
> + */
> +static int zynqmp_r5_mem_release(struct rproc *rproc,
> +				 struct rproc_mem_entry *mem)
> +{
> +	struct zynqmp_r5_mem *priv;
> +	int i, ret;
> +	struct device *dev = &rproc->dev;
> +
> +	priv = mem->priv;
> +	if (!priv)
> +		return 0;
> +	for (i = 0; i < MAX_MEM_PNODES; i++) {
> +		if (priv->pnode_id[i]) {
> +			dev_dbg(dev, "%s, pnode %d\n",
> +				__func__, priv->pnode_id[i]);
> +			ret = zynqmp_pm_release_node(priv->pnode_id[i]);
> +			if (ret < 0) {
> +				dev_err(dev,
> +					"failed to release power node: %u\n",
> +					priv->pnode_id[i]);
> +				return ret;
> +			}
> +		} else {
> +			break;
> +		}
> +	}
> +	return 0;
> +}
> +
> +/*
> + * ZynqMP R5 remoteproc operations
> + */
> +static int zynqmp_r5_rproc_start(struct rproc *rproc)
> +{
> +	struct device *dev = rproc->dev.parent;
> +	struct zynqmp_r5_pdata *local = rproc->priv;
> +	enum rpu_boot_mem bootmem;
> +	int ret;
> +	/* Set up R5 */
> +	ret = r5_set_mode(local);
> +	if (ret) {
> +		dev_err(dev, "failed to set R5 operation mode.\n");
> +		return ret;
> +	}
> +	if ((rproc->bootaddr & 0xF0000000) == 0xF0000000)
> +		bootmem = PM_RPU_BOOTMEM_HIVEC;
> +	else
> +		bootmem = PM_RPU_BOOTMEM_LOVEC;
> +	dev_info(dev, "RPU boot from %s.",
> +		 bootmem == PM_RPU_BOOTMEM_HIVEC ? "OCM" : "TCM");
> +	ret = zynqmp_pm_request_wakeup(local->pnode_id, 1,
> +				       bootmem, ZYNQMP_PM_REQUEST_ACK_NO);
> +	if (ret < 0) {
> +		dev_err(dev, "failed to boot R5.\n");
> +		return ret;
> +	}
> +	return 0;
> +}
> +
> +static int zynqmp_r5_rproc_stop(struct rproc *rproc)
> +{
> +	struct zynqmp_r5_pdata *local = rproc->priv;
> +	int ret;
> +
> +	ret = zynqmp_pm_force_powerdown(local->pnode_id,
> +					ZYNQMP_PM_REQUEST_ACK_BLOCKING);
> +	if (ret < 0) {
> +		dev_err(&local->dev, "failed to shutdown R5.\n");
> +		return ret;
> +	}
> +	local->is_r5_mode_set = false;
> +	return 0;
> +}
> +
> +static int zynqmp_r5_parse_fw(struct rproc *rproc, const struct firmware *fw)
> +{
> +	int num_mems, i, ret;
> +	struct zynqmp_r5_pdata *pdata = rproc->priv;
> +	struct device *dev = &pdata->dev;
> +	struct device_node *np = dev->of_node;
> +	struct rproc_mem_entry *mem;
> +	struct device_node *child;
> +	struct resource rsc;
> +
> +	num_mems = of_count_phandle_with_args(np, "memory-region", NULL);
> +	if (num_mems <= 0)
> +		return 0;
> +
> +	for (i = 0; i < num_mems; i++) {
> +		struct device_node *node;
> +		struct zynqmp_r5_mem *zynqmp_mem;
> +		struct reserved_mem *rmem;
> +
> +		node = of_parse_phandle(np, "memory-region", i);
> +		rmem = of_reserved_mem_lookup(node);
> +		if (!rmem) {
> +			dev_err(dev, "unable to acquire memory-region\n");
> +			return -EINVAL;
> +		}

Here you can construct a string like "rpu0vdev0buffer" by using rproc->index and
compare that with node->name.

> +		if (strstr(node->name, "vdev") &&
> +		    strstr(node->name, "buffer")) {
> +			int id;
> +			char name[16];
> +
> +			id = node->name[8] - '0';

I think a better way is to just strip off the "rpuX" portion of the newly constructed
string (above comment) and feed that to rproc_mem_entry_init().

> +			snprintf(name, sizeof(name), "vdev%dbuffer", id);
> +			/* Register DMA region */
> +			mem = rproc_mem_entry_init(dev, NULL,
> +						   (dma_addr_t)rmem->base,
> +						   rmem->size, rmem->base,

So the application processor and the R5 have the same view of the memory?

> +						   NULL, NULL,
> +						   name);
> +			if (!mem) {
> +				dev_err(dev, "unable to initialize memory-region %s\n",
> +					node->name);
> +				return -ENOMEM;
> +			}
> +			dev_dbg(dev, "parsed %s at  %llx\r\n", mem->name,
> +				mem->dma);
> +			rproc_add_carveout(rproc, mem);
> +			continue;
> +		} else if (strstr(node->name, "vdev") &&
> +				    strstr(node->name, "vring")) {
> +			int id, vring_id;
> +			char name[16];
> +
> +			id = node->name[8] - '0';
> +			vring_id = node->name[14] - '0';
> +			snprintf(name, sizeof(name), "vdev%dvring%d", id,
> +				 vring_id);
> +			/* Register vring */
> +			mem = rproc_mem_entry_init(dev, NULL,
> +						   (dma_addr_t)rmem->base,
> +						   rmem->size, rmem->base,
> +						   NULL, NULL,
> +						   name);
> +			mem->va = devm_ioremap_wc(dev, rmem->base, rmem->size);

Any reason why this can't be done via the alloc() and release() function
rprovided by rproc_mem_entry_init()?  Moreover this will core dump if mem is
NULL.

> +			if (!mem->va)
> +				return -ENOMEM;
> +			if (!mem) {
> +				dev_err(dev, "unable to initialize memory-region %s\n",
> +					node->name);
> +				return -ENOMEM;
> +			}
> +			dev_dbg(dev, "parsed %s at %llx\r\n", mem->name,
> +				mem->dma);
> +			rproc_add_carveout(rproc, mem);
> +			continue;
> +		} else {
> +			mem = rproc_of_resm_mem_entry_init(dev, i,
> +							   rmem->size,
> +							   rmem->base,
> +							   node->name);

Is this to handle rproc_0_reserved?  If so, what is it used for and if not, what
memory region is this handling?

> +			if (!mem) {
> +				dev_err(dev, "unable to initialize memory-region %s\n",
> +					node->name);
> +				return -ENOMEM;
> +			}
> +			mem->va = devm_ioremap_wc(dev, rmem->base, rmem->size);

If you need to do an ioremap on it, probably best to use rproc_mem_entry_init().

> +			if (!mem->va)
> +				return -ENOMEM;
> +
> +			rproc_add_carveout(rproc, mem);
> +		}
> +		if (!mem)
> +			return -ENOMEM;

What is this check for? As far as I can tell all the return values for @mem are
checked in the above loop.

> +
> +		/*
> +		 * It is non-DMA memory, used for firmware loading.
> +		 * It will be added to the R5 remoteproc mappings later.
> +		 */
> +		zynqmp_mem = devm_kzalloc(dev, sizeof(*zynqmp_mem), GFP_KERNEL);
> +		if (!zynqmp_mem)
> +			return -ENOMEM;
> +		ret = of_address_to_resource(node, 0, &zynqmp_mem->res);
> +		if (ret) {
> +			dev_err(dev, "unable to resolve memory region.\n");
> +			return ret;
> +		}
> +		list_add_tail(&zynqmp_mem->node, &pdata->mems);

I am curious as to why this is needed since all that information is found in the
carveouts.

I will stop here for this set.  Please address the comments coming out of this
set and we can proceed incrementally with the next one.

Thanks,
Mathieu

> +		dev_dbg(dev, "%s, non-dma mem %s\n",
> +			__func__, of_node_full_name(node));
> +	}
> +
> +	/* map TCM memories */
> +	for_each_available_child_of_node(np, child) {
> +		struct property *prop;
> +		const __be32 *cur;
> +		u32 pnode_id;
> +		void *va;
> +		dma_addr_t dma;
> +		resource_size_t size;
> +
> +		ret = of_address_to_resource(child, 0, &rsc);
> +
> +		i = 0;
> +		of_property_for_each_u32(child, "pnode-id", prop, cur,
> +					 pnode_id) {
> +			ret = zynqmp_pm_request_node(pnode_id,
> +				ZYNQMP_PM_CAPABILITY_ACCESS, 0,
> +				ZYNQMP_PM_REQUEST_ACK_BLOCKING);
> +			if (ret < 0) {
> +				dev_err(dev, "failed to request power node: %u\n",
> +					pnode_id);
> +				return ret;
> +			}
> +			ret = r5_set_mode(pdata);
> +			if (ret < 0) {
> +				dev_err(dev, "failed to set R5 operation mode.\n");
> +				return ret;
> +			}
> +		}
> +		size = resource_size(&rsc);
> +
> +		va = devm_ioremap_wc(dev, rsc.start, size);
> +		if (!va)
> +			return -ENOMEM;
> +
> +		/* zero out tcm base address */
> +		if (rsc.start & 0xffe00000) {
> +			rsc.start &= 0x000fffff;
> +			/* handle tcm banks 1 a and b
> +			 * (0xffe9000 and oxffeb0000)
> +			 */
> +				if (rsc.start & 0x80000)
> +					rsc.start -= 0x90000;
> +		}
> +
> +		dma = (dma_addr_t)rsc.start;
> +		mem = rproc_mem_entry_init(dev, va, dma, (int)size, rsc.start,
> +					   NULL, zynqmp_r5_mem_release,
> +					   rsc.name);
> +		if (!mem)
> +			return -ENOMEM;
> +
> +		rproc_add_carveout(rproc, mem);
> +	}
> +
> +	ret = rproc_elf_load_rsc_table(rproc, fw);
> +	if (ret == -EINVAL)
> +		ret = 0;
> +	return ret;
> +}
> +
> +/* kick a firmware */
> +static void zynqmp_r5_rproc_kick(struct rproc *rproc, int vqid)
> +{
> +	struct device *dev = rproc->dev.parent;
> +	struct zynqmp_r5_pdata *local = rproc->priv;
> +
> +	dev_dbg(dev, "KICK Firmware to start send messages vqid %d\n", vqid);
> +
> +	if (vqid < 0) {
> +		/* If vqid is negative, does not pass the vqid to
> +		 * mailbox. As vqid is supposed to be 0 or possive.
> +		 * It also gives a way to just kick instead but
> +		 * not use the IPI buffer. It is better to provide
> +		 * a proper way to pass the short message, which will
> +		 * need to sync to upstream first, for now,
> +		 * use negative vqid to assume no message will be
> +		 * passed with IPI buffer, but just raise interrupt.
> +		 * This will be faster as it doesn't need to copy the
> +		 * message to the IPI buffer.
> +		 *
> +		 * It will ignore the return, as failure is due to
> +		 * there already kicks in the mailbox queue.
> +		 */
> +		(void)mbox_send_message(local->tx_chan, NULL);
> +	} else {
> +		struct sk_buff *skb;
> +		unsigned int skb_len;
> +		struct zynqmp_ipi_message *mb_msg;
> +		int ret;
> +
> +		skb_len = (unsigned int)(sizeof(vqid) + sizeof(mb_msg));
> +		skb = alloc_skb(skb_len, GFP_ATOMIC);
> +		if (!skb) {
> +			dev_err(dev,
> +				"Failed to allocate skb to kick remote.\n");
> +			return;
> +		}
> +		mb_msg = (struct zynqmp_ipi_message *)skb_put(skb, skb_len);
> +		mb_msg->len = sizeof(vqid);
> +		memcpy(mb_msg->data, &vqid, sizeof(vqid));
> +		skb_queue_tail(&local->tx_mc_skbs, skb);
> +		ret = mbox_send_message(local->tx_chan, mb_msg);
> +		if (ret < 0) {
> +			dev_warn(dev, "Failed to kick remote.\n");
> +			skb_dequeue_tail(&local->tx_mc_skbs);
> +			kfree_skb(skb);
> +		}
> +	}
> +}
> +
> +static struct rproc_ops zynqmp_r5_rproc_ops = {
> +	.start		= zynqmp_r5_rproc_start,
> +	.stop		= zynqmp_r5_rproc_stop,
> +	.load		= rproc_elf_load_segments,
> +	.parse_fw	= zynqmp_r5_parse_fw,
> +	.find_loaded_rsc_table = rproc_elf_find_loaded_rsc_table,
> +	.sanity_check	= rproc_elf_sanity_check,
> +	.get_boot_addr	= rproc_elf_get_boot_addr,
> +	.kick		= zynqmp_r5_rproc_kick,
> +};
> +
> +/* zynqmp_r5_mem_probe() - probes RPU TCM memory device
> + * @pdata: pointer to the RPU remoteproc private data
> + * @node: pointer to the memory node
> + *
> + * Function to retrieve memories resources for RPU TCM memory device.
> + */
> +static int zynqmp_r5_mem_probe(struct zynqmp_r5_pdata *pdata,
> +			       struct device_node *node)
> +{
> +	struct device *dev;
> +	struct zynqmp_r5_mem *mem;
> +	int ret;
> +
> +	dev = &pdata->dev;
> +	mem = devm_kzalloc(dev, sizeof(*mem), GFP_KERNEL);
> +	if (!mem)
> +		return -ENOMEM;
> +	ret = of_address_to_resource(node, 0, &mem->res);
> +	if (ret < 0) {
> +		dev_err(dev, "failed to get resource of memory %s",
> +			of_node_full_name(node));
> +		return -EINVAL;
> +	}
> +
> +	/* Get the power domain id */
> +	if (of_find_property(node, "pnode-id", NULL)) {
> +		struct property *prop;
> +		const __be32 *cur;
> +		u32 val;
> +		int i = 0;
> +
> +		of_property_for_each_u32(node, "pnode-id", prop, cur, val)
> +			mem->pnode_id[i++] = val;
> +	}
> +	list_add_tail(&mem->node, &pdata->mems);
> +	return 0;
> +}
> +
> +/**
> + * zynqmp_r5_release() - ZynqMP R5 device release function
> + * @dev: pointer to the device struct of ZynqMP R5
> + *
> + * Function to release ZynqMP R5 device.
> + */
> +static void zynqmp_r5_release(struct device *dev)
> +{
> +	struct zynqmp_r5_pdata *pdata;
> +	struct rproc *rproc;
> +	struct sk_buff *skb;
> +
> +	pdata = dev_get_drvdata(dev);
> +	rproc = pdata->rproc;
> +	if (rproc) {
> +		rproc_del(rproc);
> +		rproc_free(rproc);
> +	}
> +	if (pdata->tx_chan)
> +		mbox_free_channel(pdata->tx_chan);
> +	if (pdata->rx_chan)
> +		mbox_free_channel(pdata->rx_chan);
> +	/* Discard all SKBs */
> +	while (!skb_queue_empty(&pdata->tx_mc_skbs)) {
> +		skb = skb_dequeue(&pdata->tx_mc_skbs);
> +		kfree_skb(skb);
> +	}
> +
> +	put_device(dev->parent);
> +}
> +
> +/**
> + * event_notified_idr_cb() - event notified idr callback
> + * @id: idr id
> + * @ptr: pointer to idr private data
> + * @data: data passed to idr_for_each callback
> + *
> + * Pass notification to remtoeproc virtio
> + *
> + * Return: 0. having return is to satisfy the idr_for_each() function
> + *          pointer input argument requirement.
> + **/
> +static int event_notified_idr_cb(int id, void *ptr, void *data)
> +{
> +	struct rproc *rproc = data;
> +
> +	(void)rproc_vq_interrupt(rproc, id);
> +	return 0;
> +}
> +
> +/**
> + * handle_event_notified() - remoteproc notification work funciton
> + * @work: pointer to the work structure
> + *
> + * It checks each registered remoteproc notify IDs.
> + */
> +static void handle_event_notified(struct work_struct *work)
> +{
> +	struct rproc *rproc;
> +	struct zynqmp_r5_pdata *local;
> +
> +	local = container_of(work, struct zynqmp_r5_pdata, workqueue);
> +
> +	(void)mbox_send_message(local->rx_chan, NULL);
> +	rproc = local->rproc;
> +	/*
> +	 * We only use IPI for interrupt. The firmware side may or may
> +	 * not write the notifyid when it trigger IPI.
> +	 * And thus, we scan through all the registered notifyids.
> +	 */
> +	idr_for_each(&rproc->notifyids, event_notified_idr_cb, rproc);
> +}
> +
> +/**
> + * zynqmp_r5_mb_rx_cb() - Receive channel mailbox callback
> + * @cl: mailbox client
> + * @mssg: message pointer
> + *
> + * It will schedule the R5 notification work.
> + */
> +static void zynqmp_r5_mb_rx_cb(struct mbox_client *cl, void *mssg)
> +{
> +	struct zynqmp_r5_pdata *local;
> +
> +	local = container_of(cl, struct zynqmp_r5_pdata, rx_mc);
> +	if (mssg) {
> +		struct zynqmp_ipi_message *ipi_msg, *buf_msg;
> +		size_t len;
> +
> +		ipi_msg = (struct zynqmp_ipi_message *)mssg;
> +		buf_msg = (struct zynqmp_ipi_message *)local->rx_mc_buf;
> +		len = (ipi_msg->len >= IPI_BUF_LEN_MAX) ?
> +		      IPI_BUF_LEN_MAX : ipi_msg->len;
> +		buf_msg->len = len;
> +		memcpy(buf_msg->data, ipi_msg->data, len);
> +	}
> +	schedule_work(&local->workqueue);
> +}
> +
> +/**
> + * zynqmp_r5_mb_tx_done() - Request has been sent to the remote
> + * @cl: mailbox client
> + * @mssg: pointer to the message which has been sent
> + * @r: status of last TX - OK or error
> + *
> + * It will be called by the mailbox framework when the last TX has done.
> + */
> +static void zynqmp_r5_mb_tx_done(struct mbox_client *cl, void *mssg, int r)
> +{
> +	struct zynqmp_r5_pdata *local;
> +	struct sk_buff *skb;
> +
> +	if (!mssg)
> +		return;
> +	local = container_of(cl, struct zynqmp_r5_pdata, tx_mc);
> +	skb = skb_dequeue(&local->tx_mc_skbs);
> +	kfree_skb(skb);
> +}
> +
> +/**
> + * zynqmp_r5_setup_mbox() - Setup mailboxes
> + *
> + * @pdata: pointer to the ZynqMP R5 processor platform data
> + * @node: pointer of the device node
> + *
> + * Function to setup mailboxes to talk to RPU.
> + *
> + * Return: 0 for success, negative value for failure.
> + */
> +static int zynqmp_r5_setup_mbox(struct zynqmp_r5_pdata *pdata,
> +				struct device_node *node)
> +{
> +	struct device *dev = &pdata->dev;
> +	struct mbox_client *mclient;
> +
> +	/* Setup TX mailbox channel client */
> +	mclient = &pdata->tx_mc;
> +	mclient->dev = dev;
> +	mclient->rx_callback = NULL;
> +	mclient->tx_block = false;
> +	mclient->knows_txdone = false;
> +	mclient->tx_done = zynqmp_r5_mb_tx_done;
> +
> +	/* Setup TX mailbox channel client */
> +	mclient = &pdata->rx_mc;
> +	mclient->dev = dev;
> +	mclient->rx_callback = zynqmp_r5_mb_rx_cb;
> +	mclient->tx_block = false;
> +	mclient->knows_txdone = false;
> +
> +	INIT_WORK(&pdata->workqueue, handle_event_notified);
> +
> +	/* Request TX and RX channels */
> +	pdata->tx_chan = mbox_request_channel_byname(&pdata->tx_mc, "tx");
> +	if (IS_ERR(pdata->tx_chan)) {
> +		dev_err(dev, "failed to request mbox tx channel.\n");
> +		pdata->tx_chan = NULL;
> +		return -EINVAL;
> +	}
> +	pdata->rx_chan = mbox_request_channel_byname(&pdata->rx_mc, "rx");
> +	if (IS_ERR(pdata->rx_chan)) {
> +		dev_err(dev, "failed to request mbox rx channel.\n");
> +		pdata->rx_chan = NULL;
> +		return -EINVAL;
> +	}
> +	skb_queue_head_init(&pdata->tx_mc_skbs);
> +	return 0;
> +}
> +
> +/**
> + * zynqmp_r5_probe() - Probes ZynqMP R5 processor device node
> + * @pdata: pointer to the ZynqMP R5 processor platform data
> + * @pdev: parent RPU domain platform device
> + * @node: pointer of the device node
> + *
> + * Function to retrieve the information of the ZynqMP R5 device node.
> + *
> + * Return: 0 for success, negative value for failure.
> + */
> +static int zynqmp_r5_probe(struct zynqmp_r5_pdata *pdata,
> +			   struct platform_device *pdev,
> +			   struct device_node *node)
> +{
> +	struct device *dev = &pdata->dev;
> +	struct rproc *rproc;
> +	struct device_node *nc;
> +	int ret;
> +
> +	/* Create device for ZynqMP R5 device */
> +	dev->parent = &pdev->dev;
> +	dev->release = zynqmp_r5_release;
> +	dev->of_node = node;
> +	dev_set_name(dev, "%s", of_node_full_name(node));
> +	dev_set_drvdata(dev, pdata);
> +	ret = device_register(dev);
> +	if (ret) {
> +		dev_err(dev, "failed to register device.\n");
> +		return ret;
> +	}
> +	get_device(&pdev->dev);
> +
> +	/* Allocate remoteproc instance */
> +	rproc = rproc_alloc(dev, dev_name(dev), &zynqmp_r5_rproc_ops, NULL, 0);
> +	if (!rproc) {
> +		dev_err(dev, "rproc allocation failed.\n");
> +		ret = -ENOMEM;
> +		goto error;
> +	}
> +	rproc->auto_boot = autoboot;
> +	pdata->rproc = rproc;
> +	rproc->priv = pdata;
> +
> +	/*
> +	 * The device has not been spawned from a device tree, so
> +	 * arch_setup_dma_ops has not been not called, thus leaving
> +	 * the device with dummy DMA ops.
> +	 * Fix this by inheriting the parent's DMA ops and mask.
> +	 */
> +	rproc->dev.dma_mask = pdev->dev.dma_mask;
> +	set_dma_ops(&rproc->dev, get_dma_ops(&pdev->dev));
> +
> +	/* Probe R5 memory devices */
> +	INIT_LIST_HEAD(&pdata->mems);
> +	for_each_available_child_of_node(node, nc) {
> +		ret = zynqmp_r5_mem_probe(pdata, nc);
> +		if (ret) {
> +			dev_err(dev, "failed to probe memory %s.\n",
> +				of_node_full_name(nc));
> +			goto error;
> +		}
> +	}
> +
> +	/* Set up DMA mask */
> +	ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
> +	if (ret) {
> +		dev_warn(dev, "dma_set_coherent_mask failed: %d\n", ret);
> +		/* If DMA is not configured yet, try to configure it. */
> +		ret = of_dma_configure(dev, node, true);
> +		if (ret) {
> +			dev_err(dev, "failed to configure DMA.\n");
> +			goto error;
> +		}
> +	}
> +
> +	/* Get R5 power domain node */
> +	ret = of_property_read_u32(node, "pnode-id", &pdata->pnode_id);
> +	if (ret) {
> +		dev_err(dev, "failed to get power node id.\n");
> +		goto error;
> +	}
> +
> +	/* Check if R5 is running */
> +	if (r5_is_running(pdata)) {
> +		atomic_inc(&rproc->power);
> +		rproc->state = RPROC_RUNNING;
> +	}
> +
> +	if (!of_get_property(dev->of_node, "mboxes", NULL)) {
> +		dev_info(dev, "no mailboxes.\n");
> +	} else {
> +		ret = zynqmp_r5_setup_mbox(pdata, node);
> +		if (ret < 0)
> +			goto error;
> +	}
> +
> +	/* Add R5 remoteproc */
> +	ret = rproc_add(rproc);
> +	if (ret) {
> +		dev_err(dev, "rproc registration failed\n");
> +		goto error;
> +	}
> +	return 0;
> +error:
> +	if (pdata->rproc)
> +		rproc_free(pdata->rproc);
> +	pdata->rproc = NULL;
> +	device_unregister(dev);
> +	put_device(&pdev->dev);
> +	return ret;
> +}
> +
> +static int zynqmp_r5_remoteproc_probe(struct platform_device *pdev)
> +{
> +	const unsigned char *prop;
> +	int ret = 0, i;
> +	struct device *dev = &pdev->dev;
> +	struct device_node *nc;
> +
> +	prop = of_get_property(dev->of_node, "core_conf", NULL);
> +	if (!prop) {
> +		dev_err(&pdev->dev, "core_conf is not used.\n");
> +		return -EINVAL;
> +	}
> +
> +	dev_info(dev, "RPU core_conf: %s\n", prop);
> +	if (!strcmp(prop, "split")) {
> +		rpu_mode = PM_RPU_MODE_SPLIT;
> +	} else if (!strcmp(prop, "lockstep")) {
> +		rpu_mode = PM_RPU_MODE_LOCKSTEP;
> +	} else {
> +		dev_err(dev,
> +			"Invalid core_conf mode provided - %s , %d\n",
> +			prop, (int)rpu_mode);
> +		return -EINVAL;
> +	}
> +
> +	i = 0;
> +	for_each_available_child_of_node(dev->of_node, nc) {
> +		ret = zynqmp_r5_probe(&rpus[i], pdev, nc);
> +		if (ret) {
> +			dev_err(dev, "failed to probe rpu %s.\n",
> +				of_node_full_name(nc));
> +			return ret;
> +		}
> +		i++;
> +	}
> +
> +	return 0;
> +}
> +
> +static int zynqmp_r5_remoteproc_remove(struct platform_device *pdev)
> +{
> +	int i;
> +
> +	for (i = 0; i < MAX_RPROCS; i++) {
> +		struct zynqmp_r5_pdata *rpu = &rpus[i];
> +		struct rproc *rproc;
> +
> +		rproc = rpu->rproc;
> +		if (rproc) {
> +			rproc_del(rproc);
> +			rproc_free(rproc);
> +			rpu->rproc = NULL;
> +		}
> +		if (rpu->tx_chan) {
> +			mbox_free_channel(rpu->tx_chan);
> +			rpu->tx_chan = NULL;
> +		}
> +		if (rpu->rx_chan) {
> +			mbox_free_channel(rpu->rx_chan);
> +			rpu->rx_chan = NULL;
> +		}
> +
> +		device_unregister(&rpu->dev);
> +	}
> +
> +	return 0;
> +}
> +
> +/* Match table for OF platform binding */
> +static const struct of_device_id zynqmp_r5_remoteproc_match[] = {
> +	{ .compatible = "xlnx,zynqmp-r5-remoteproc-1.0", },
> +	{ /* end of list */ },
> +};
> +MODULE_DEVICE_TABLE(of, zynqmp_r5_remoteproc_match);
> +
> +static struct platform_driver zynqmp_r5_remoteproc_driver = {
> +	.probe = zynqmp_r5_remoteproc_probe,
> +	.remove = zynqmp_r5_remoteproc_remove,
> +	.driver = {
> +		.name = "zynqmp_r5_remoteproc",
> +		.of_match_table = zynqmp_r5_remoteproc_match,
> +	},
> +};
> +module_platform_driver(zynqmp_r5_remoteproc_driver);
> +
> +module_param_named(autoboot,  autoboot, bool, 0444);
> +MODULE_PARM_DESC(autoboot,
> +		 "enable | disable autoboot. (default: true)");
> +
> +MODULE_AUTHOR("Ben Levinsky <[email-masked]>");
> +MODULE_LICENSE("GPL v2");
> +MODULE_DESCRIPTION("ZynqMP R5 remote processor control driver");
> -- 
> 2.7.4
> 

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