Re: [PATCH v6 5/5] remoteproc: Add initial zynqmp R5 remoteproc driver

Mathieu Poirier
2020-07-27T23:00:01Z

On Wed, Jul 15, 2020 at 08:33:17AM -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 <stefano.stabellini@xilinx.com>
> Acked-by: Ben Levinsky <ben.levinsky@xilinx.com>
> Reviewed-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
> Signed-off-by: Ben Levinsky <ben.levinsky@xilinx.com>
> Signed-off-by: Wendy Liang <wendy.liang@xilinx.com>
> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
> Signed-off-by: Ed Mooring <ed.mooring@xilinx.com>
> Signed-off-by: Jason Wu <j.wu@xilinx.com>
> Tested-by: Ben Levinsky <ben.levinsky@xilinx.com>
> ---
> v2:
> - remove domain struct as per review from Mathieu
> v3:
> - add xilinx-related platform mgmt fn's instead of wrapping around
> function pointer in xilinx eemi ops struct
> v4:
> - add default values for enums
> - fix formatting as per checkpatch.pl --strict. Note that 1 warning and 1 check
> are still raised as each is due to fixing the warning results in that
> particular line going over 80 characters.
> v5:
> - parse_fw change from use of rproc_of_resm_mem_entry_init to rproc_mem_entry_init and use of alloc/release
> - var's of type zynqmp_r5_pdata all have same local variable name
> - use dev_dbg instead of dev_info
> v6:
> - adding memory carveouts is handled much more similarly. All mem carveouts are
> now described in reserved memory as needed. That is, TCM nodes are not
> coupled to remoteproc anymore. This is reflected in the remoteproc R5 driver
> and the device tree binding.
> - remove mailbox from device tree binding as it is not necessary for elf
> loading
> - use lockstep-mode property for configuring RPU
> ---
> drivers/remoteproc/Kconfig | 10 +
> drivers/remoteproc/Makefile | 1 +
> drivers/remoteproc/zynqmp_r5_remoteproc.c | 911 ++++++++++++++++++++++
> 3 files changed, 922 insertions(+)
> create mode 100644 drivers/remoteproc/zynqmp_r5_remoteproc.c
>
> diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
> index c4d1731295eb..342a7e668636 100644
> --- a/drivers/remoteproc/Kconfig
> +++ b/drivers/remoteproc/Kconfig
> @@ -249,6 +249,16 @@ config STM32_RPROC
>
> 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.
> +
> endif # REMOTEPROC
>
> endmenu
> diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
> index e8b886e511f0..04d1c95d06d7 100644
> --- a/drivers/remoteproc/Makefile
> +++ b/drivers/remoteproc/Makefile
> @@ -28,5 +28,6 @@ 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 000000000000..b600759e257e
> --- /dev/null
> +++ b/drivers/remoteproc/zynqmp_r5_remoteproc.c
> @@ -0,0 +1,911 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Zynq R5 Remote Processor driver
> + *
> + * Copyright (C) 2019, 2020 Xilinx Inc. Ben Levinsky <ben.levinsky@xilinx.com>
> + * Copyright (C) 2015 - 2018 Xilinx Inc.
> + * Copyright (C) 2015 Jason Wu <j.wu@xilinx.com>
> + *
> + * Based on origin OMAP and Zynq Remote Processor driver
> + *
> + * Copyright (C) 2012 Michal Simek <monstr@monstr.eu>
> + * Copyright (C) 2012 PetaLogix
> + * Copyright (C) 2011 Texas Instruments, Inc.
> + * Copyright (C) 2011 Google, Inc.
> + */
> +
> +#include <linux/atomic.h>

Unused

> +#include <linux/cpu.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/delay.h>

Unused

> +#include <linux/err.h>
> +#include <linux/firmware/xlnx-zynqmp.h>
> +#include <linux/genalloc.h>

Unused

> +#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>

Unused

> +#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

Unused

> +
> +/* 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))
> +
> +#define ZYNQMP_R5_NUM_TCM_BANKS 4
> +
> +/* lookup table mapping power-node-ID of TCM bank to absolute base address */
> +static unsigned long tcm_addr_to_pnode[ZYNQMP_R5_NUM_TCM_BANKS][2] = {
> + {0xFFE00000, 0xF },
> + {0xFFE20000, 0x10},
> + {0xFFE90000, 0x10},
> + {0xFFEB0000, 0x11},
> +};
> +
> +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
> + * @mbox_work: mbox_work 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 mbox_work;
> + 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, tcm_mode;
> + struct device *dev = &pdata->dev;
> + int ret;
> +
> + 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;
> + }
> + }
> +
> + tcm_mode = (expect == (u32)PM_RPU_MODE_LOCKSTEP) ?
> + PM_RPU_TCM_COMB : PM_RPU_TCM_SPLIT;
> + ret = zynqmp_pm_set_tcm_config(pdata->pnode_id, tcm_mode, 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;
> +}
> +
> +/*
> + * 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 *pdata = rproc->priv;
> + enum rpu_boot_mem bootmem;
> + int ret;
> +
> + if ((rproc->bootaddr & 0xF0000000) == 0xF0000000)
> + bootmem = PM_RPU_BOOTMEM_HIVEC;
> + else
> + bootmem = PM_RPU_BOOTMEM_LOVEC;
> + dev_dbg(dev, "RPU boot from %s.",
> + bootmem == PM_RPU_BOOTMEM_HIVEC ? "OCM" : "TCM");
> + ret = zynqmp_pm_request_wakeup(pdata->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 *pdata = rproc->priv;
> + int ret;
> +
> + ret = zynqmp_pm_force_powerdown(pdata->pnode_id,
> + ZYNQMP_PM_REQUEST_ACK_BLOCKING);
> + if (ret < 0) {
> + dev_err(&pdata->dev, "failed to shutdown R5.\n");
> + return ret;
> + }
> + return 0;
> +}
> +
> +static int zynqmp_r5_rproc_mem_alloc(struct rproc *rproc,
> + struct rproc_mem_entry *mem)
> +{
> + struct device *dev = rproc->dev.parent;
> + void *va;
> +
> + dev_dbg(rproc->dev.parent, "map memory: %pa\n", &mem->dma);
> + va = ioremap_wc(mem->dma, mem->len);
> + if (IS_ERR_OR_NULL(va)) {
> + dev_err(dev, "Unable to map memory region: %pa+%lx\n",
> + &mem->dma, mem->len);
> + return -ENOMEM;
> + }
> +
> + /* Update memory entry va */
> + mem->va = va;
> +
> + return 0;
> +}
> +
> +static int zynqmp_r5_rproc_mem_release(struct rproc *rproc,
> + struct rproc_mem_entry *mem)
> +{
> + dev_dbg(rproc->dev.parent, "unmap memory: %pa\n", &mem->dma);
> + iounmap(mem->va);
> +
> + return 0;
> +}
> +
> +/*
> + * TCM needs mapping to R5 relative address and xilinx platform mgmt call
> + */
> +struct rproc_mem_entry *handle_tcm_parsing(struct device *dev,
> + struct reserved_mem *rmem,
> + struct device_node *node,
> + int lookup_idx)
> +{
> + void *va;
> + dma_addr_t dma;
> + resource_size_t size;
> + int ret;
> + u32 pnode_id;
> + struct resource rsc;
> + struct rproc_mem_entry *mem;
> +
> + pnode_id = tcm_addr_to_pnode[lookup_idx][1];
> + 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 -EINVAL;
> + }
> +
> + ret = of_address_to_resource(node, 0, &rsc);
> + if (ret < 0) {
> + dev_err(dev, "failed to get resource of memory %s",
> + of_node_full_name(node));
> + return -EINVAL;
> + }
> + 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) {
> + /* R5 can't see anything past 0xfffff so wipe it */
> + rsc.start &= 0x000fffff;
> + /*
> + * handle tcm banks 1 a and b (0xffe9000 and
> + * 0xffeb0000)
> + */
> + 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;
> +
> + return mem;
> +}
> +
> +static int parse_mem_regions(struct rproc *rproc)
> +{
> + int num_mems, i;
> + struct zynqmp_r5_pdata *pdata = rproc->priv;
> + struct device *dev = &pdata->dev;
> + struct device_node *np = dev->of_node;
> + struct rproc_mem_entry *mem;
> +
> + 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 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;
> + }
> +
> + if (strstr(node->name, "vdev0buffer")) {
> + /* Register DMA region */
> + mem = rproc_mem_entry_init(dev, NULL,
> + (dma_addr_t)rmem->base,
> + rmem->size, rmem->base,
> + NULL, NULL,
> + "vdev0buffer");
> + 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);
> + } else if (strstr(node->name, "vdev0vring")) {
> + int vring_id;
> + char name[16];
> +
> + /*
> + * can be 1 of multiple vring IDs per IPC channel
> + * e.g. 'vdev0vring0' and 'vdev0vring1'
> + */
> + vring_id = node->name[14] - '0';
> + snprintf(name, sizeof(name), "vdev0vring%d", vring_id);
> + /* Register vring */
> + mem = rproc_mem_entry_init(dev, NULL,
> + (dma_addr_t)rmem->base,
> + rmem->size, rmem->base,
> + zynqmp_r5_rproc_mem_alloc,
> + zynqmp_r5_rproc_mem_release,
> + name);
> + dev_dbg(dev, "parsed %s at %llx\r\n", mem->name,
> + mem->dma);
> + } else {
> + int idx;
> +
> + /*
> + * if TCM update address space for R5 and
> + * make xilinx platform mgmt call
> + */
> + for (idx = 0; idx < ZYNQMP_R5_NUM_TCM_BANKS; idx++) {
> + if (tcm_addr_to_pnode[idx][0] == rmem->base)
> + break;
> + }
> +
> + if (idx != ZYNQMP_R5_NUM_TCM_BANKS) {
> + mem = handle_tcm_parsing(dev, rmem, node, idx);
> + } else {
> + mem = rproc_mem_entry_init(dev, NULL,
> + (dma_addr_t)rmem->base,
> + rmem->size, rmem->base,
> + zynqmp_r5_rproc_mem_alloc,
> + zynqmp_r5_rproc_mem_release,
> + node->name);
> + }
> +
> + if (!mem) {
> + dev_err(dev,
> + "unable to init memory-region %s\n",
> + node->name);
> + return -ENOMEM;
> + }
> + }
> + rproc_add_carveout(rproc, mem);
> + }
> +
> + return 0;
> +}
> +
> +static int zynqmp_r5_parse_fw(struct rproc *rproc, const struct firmware *fw)
> +{
> + int ret;
> + struct zynqmp_r5_pdata *pdata = rproc->priv;
> + struct device *dev = &pdata->dev;
> +
> + ret = parse_mem_regions(rproc);
> + if (ret) {
> + dev_err(dev, "parse_mem_regions failed %x\n", ret);
> + return ret;
> + }
> +
> + ret = rproc_elf_load_rsc_table(rproc, fw);
> + if (ret == -EINVAL) {
> + dev_dbg(dev, "no resource table found.\n");
> + 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 *pdata = 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(pdata->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(&pdata->tx_mc_skbs, skb);
> + ret = mbox_send_message(pdata->tx_chan, mb_msg);
> + if (ret < 0) {
> + dev_warn(dev, "Failed to kick remote.\n");
> + skb_dequeue_tail(&pdata->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 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;
> + struct property *prop;
> + const __be32 *cur;
> + u32 val;
> + int i;
> +
> + 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 */
> + i = 0;
> + if (of_find_property(node, "pnode-id", NULL)) {
> + 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 remoteproc 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 *pdata;
> +
> + pdata = container_of(work, struct zynqmp_r5_pdata, mbox_work);
> +
> + (void)mbox_send_message(pdata->rx_chan, NULL);
> + rproc = pdata->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 *pdata;
> +
> + pdata = 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 *)pdata->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(&pdata->mbox_work);
> +}
> +
> +/**
> + * 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 *pdata;
> + struct sk_buff *skb;
> +
> + if (!mssg)
> + return;
> + pdata = container_of(cl, struct zynqmp_r5_pdata, tx_mc);
> + skb = skb_dequeue(&pdata->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->mbox_work, 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 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;
> + }
> +
> + /* TODO Check if R5 is running */
> +
> + /* Set up R5 if not already setup */
> + ret = pdata->is_r5_mode_set ? 0 : r5_set_mode(pdata);
> + if (ret) {
> + dev_err(dev, "failed to set R5 operation mode.\n");
> + return ret;
> + }
> +
> + if (!of_get_property(dev->of_node, "mboxes", NULL)) {
> + dev_dbg(dev, "no mailboxes.\n");
> + goto error;
> + } 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)
> +{
> + int ret, i = 0;
> + u32 *lockstep_mode;

Can this just be a regular variable?

> + struct device *dev = &pdev->dev;
> + struct device_node *nc;
> + struct zynqmp_r5_pdata *pdata;
> +
> + pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
> + lockstep_mode = devm_kzalloc(dev, sizeof(u32 *), GFP_KERNEL);
> + if (!pdata || !lockstep_mode)
> + return -ENOMEM;
> +
> + platform_set_drvdata(pdev, pdata);
> +
> + of_property_read_u32(dev->of_node, "lockstep-mode", lockstep_mode);

To make Rob's life a little easier this should probably be "xilinx,cluster-mode"
so that it follows what TI has done.

I am out of time for today, I will continue tomorrow.

Thanks,
Mathieu

> +
> + if (!(*lockstep_mode)) {
> + rpu_mode = PM_RPU_MODE_SPLIT;
> + } else if (*lockstep_mode == 1) {
> + rpu_mode = PM_RPU_MODE_LOCKSTEP;
> + } else {
> + dev_err(dev,
> + "Invalid lockstep-mode mode provided - %x %d\n",
> + *lockstep_mode, rpu_mode);
> + return -EINVAL;
> + }
> + dev_dbg(dev, "RPU configuration: %s\r\n",
> + (*lockstep_mode) ? "lockstep" : "split");
> +
> + 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 *pdata = &rpus[i];
> + struct rproc *rproc;
> +
> + rproc = pdata->rproc;
> + if (rproc) {
> + rproc_del(rproc);
> + rproc_free(rproc);
> + pdata->rproc = NULL;
> + }
> + if (pdata->tx_chan) {
> + mbox_free_channel(pdata->tx_chan);
> + pdata->tx_chan = NULL;
> + }
> + if (pdata->rx_chan) {
> + mbox_free_channel(pdata->rx_chan);
> + pdata->rx_chan = NULL;
> + }
> +
> + device_unregister(&pdata->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: false)");
> +
> +MODULE_AUTHOR("Ben Levinsky <ben.levinsky@xilinx.com>");
> +MODULE_LICENSE("GPL v2");
> --
> 2.17.1
>