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SubjectRe: [PATCH v25 5/5] remoteproc: Add initial zynqmp R5 remoteproc driver
Good day,

I have started to review this set - as with previous revisions comments will
come over several days.

On Sun, Jan 10, 2021 at 06:02:50PM -0800, 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 two different
> configurations -
> * Split
> * Lockstep
>
> The Xilinx R5 Remoteproc Driver boots the R5's via calls to the Xilinx
> Platform Management Unit that handles the R5 configuration, memory access
> and R5 lifecycle management. The interface to this manager is done in this
> driver via zynqmp_pm_* function calls.
>
> 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>
> Signed-off-by: Ben Levinsky <ben.levinsky@xilinx.com>
> ---
> v25:
> - reword error message for rpu configuration
> - change char name[15] to 16 chars to have null terminated string
> in parse_mem_regions()
> - reword comments in tcm_mem_alloc
> - call xilinx platform cleanup in parse_tcm_banks() case of failure
> - check value of mbox_send_message in all instances within this driver
> - indentation in zynqmp_r5_remoteproc driver
> - update style of constructing carveouts to match convention in ST
> remoteproc drivers. No longer iterate through memory-region property
> using of_count_phandle_with_args. Instead use of_phandle_iterator
> - use rproc_of_resm_mem_entry_init for vdev0buffer carveout as per feedback
> - rework loop in zynqmp_r5_pm_request_sram as per feedback
> - fix comment and linebreak in tcm_mem_alloc description
> - add comments and remove extraneous devm_ioremap_wc call in tcm_mem_alloc
> - in parse_tcm_banks remove check for bank not being available
> - rework order of locals and remove else in zynqmp_r5_rproc_kick
> - document and update logic for zynqmp_r5_parse_fw
> - add dev_dbg output in event_notified_idr_cb if
> rproc_vq_interrupt(rproc, id) == IRQ_NONE
> - add comment for handle_event_notified mbox_send_message function call
> - add comment for zynqmp_r5_mb_rx_cb
> - update zynqmp_r5_setup_mbox to match convention of mbox setup in ST
> remoteproc drivers
> - change return in zynqmp_r5_setup_mbox to use PTR_ERR
> - add zynqmp_r5_cleanup_mbox
> - in zynqmp_r5_probe, reteurn zynqmp_r5_rproc instead of taking in as arg.
> - in zynqmp_r5_probe use return of PTR_ERR and use zynqmp_r5_cleanup_mbox
> - in zynqmp_r5_remoteproc_probe update use return value of zynqmp_r5_probe as
> either zynqmp_r5_rproc* or PTR_ERR
> - update loop that cleans up cluster and mboxes in zynqmp_r5_remoteproc_probe
> - update loop that cleans up cluster and mboxes in zynqmp_r5_remoteproc_remove
> ---
> drivers/remoteproc/Kconfig | 8 +
> drivers/remoteproc/Makefile | 1 +
> drivers/remoteproc/zynqmp_r5_remoteproc.c | 898 ++++++++++++++++++++++
> 3 files changed, 907 insertions(+)
> create mode 100644 drivers/remoteproc/zynqmp_r5_remoteproc.c
>
> diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
> index c6659dfea7c7..c2fe54b1d94f 100644
> --- a/drivers/remoteproc/Kconfig
> +++ b/drivers/remoteproc/Kconfig
> @@ -275,6 +275,14 @@ config TI_K3_DSP_REMOTEPROC
> It's safe to say N here if you're not interested in utilizing
> the DSP slave processors.
>
> +config ZYNQMP_R5_REMOTEPROC
> + tristate "ZynqMP R5 remoteproc support"
> + depends on PM && ARCH_ZYNQMP
> + select RPMSG_VIRTIO
> + select ZYNQMP_IPI_MBOX
> + help
> + Say y or m 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 3dfa28e6c701..ef1abff654c2 100644
> --- a/drivers/remoteproc/Makefile
> +++ b/drivers/remoteproc/Makefile
> @@ -33,3 +33,4 @@ obj-$(CONFIG_ST_REMOTEPROC) += st_remoteproc.o
> obj-$(CONFIG_ST_SLIM_REMOTEPROC) += st_slim_rproc.o
> obj-$(CONFIG_STM32_RPROC) += stm32_rproc.o
> obj-$(CONFIG_TI_K3_DSP_REMOTEPROC) += ti_k3_dsp_remoteproc.o
> +obj-$(CONFIG_ZYNQMP_R5_REMOTEPROC) += zynqmp_r5_remoteproc.o
> diff --git a/drivers/remoteproc/zynqmp_r5_remoteproc.c b/drivers/remoteproc/zynqmp_r5_remoteproc.c
> new file mode 100644
> index 000000000000..9e228c9ecd43
> --- /dev/null
> +++ b/drivers/remoteproc/zynqmp_r5_remoteproc.c
> @@ -0,0 +1,898 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Zynq R5 Remote Processor driver
> + *
> + * Based on origin OMAP and Zynq Remote Processor driver
> + *
> + */
> +
> +#include <linux/firmware/xlnx-zynqmp.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_platform.h>
> +#include <linux/of_reserved_mem.h>
> +#include <linux/platform_device.h>
> +#include <linux/remoteproc.h>
> +#include <linux/skbuff.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 BANK_LIST_PROP "sram"
> +#define DDR_LIST_PROP "memory-region"
> +
> +/* 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))
> +
> +/*
> + * Map each Xilinx on-chip SRAM Bank address to their own respective
> + * pm_node_id.
> + */
> +struct sram_addr_data {
> + phys_addr_t addr;
> + enum pm_node_id id;
> +};
> +
> +#define NUM_SRAMS 4U
> +static const struct sram_addr_data zynqmp_banks[NUM_SRAMS] = {
> + {0xffe00000UL, NODE_TCM_0_A},
> + {0xffe20000UL, NODE_TCM_0_B},
> + {0xffe90000UL, NODE_TCM_1_A},
> + {0xffeb0000UL, NODE_TCM_1_B},
> +};
> +
> +/**
> + * struct zynqmp_r5_rproc - ZynqMP R5 core structure
> + *
> + * @rx_mc_buf: rx mailbox client buffer to save the rx message
> + * @tx_mc: tx mailbox client
> + * @rx_mc: rx mailbox client
> + * @mbox_work: mbox_work for the RPU remoteproc
> + * @tx_mc_skbs: socket buffers for tx mailbox client
> + * @dev: device of RPU instance
> + * @rproc: rproc handle
> + * @tx_chan: tx mailbox channel
> + * @rx_chan: rx mailbox channel
> + * @pnode_id: RPU CPU power domain id
> + * @elem: linked list item
> + */
> +struct zynqmp_r5_rproc {
> + unsigned char rx_mc_buf[RX_MBOX_CLIENT_BUF_MAX];
> + struct mbox_client tx_mc;
> + struct mbox_client rx_mc;
> + struct work_struct mbox_work;
> + struct sk_buff_head tx_mc_skbs;
> + struct device *dev;
> + struct rproc *rproc;
> + struct mbox_chan *tx_chan;
> + struct mbox_chan *rx_chan;
> + u32 pnode_id;
> + struct list_head elem;
> +};
> +
> +/*
> + * r5_set_mode - set RPU operation mode
> + * @z_rproc: Remote processor private data
> + * @rpu_mode: mode specified by device tree to configure the RPU to
> + *
> + * set RPU operation mode
> + *
> + * Return: 0 for success, negative value for failure
> + */
> +static int r5_set_mode(struct zynqmp_r5_rproc *z_rproc,
> + enum rpu_oper_mode rpu_mode)
> +{
> + enum rpu_tcm_comb tcm_mode;
> + enum rpu_oper_mode cur_rpu_mode;
> + int ret;
> +
> + ret = zynqmp_pm_get_rpu_mode(z_rproc->pnode_id, &cur_rpu_mode);
> + if (ret < 0)
> + return ret;
> +
> + if (rpu_mode != cur_rpu_mode) {
> + ret = zynqmp_pm_set_rpu_mode(z_rproc->pnode_id, rpu_mode);
> + if (ret < 0)
> + return ret;
> + }
> +
> + tcm_mode = (rpu_mode == PM_RPU_MODE_LOCKSTEP) ?
> + PM_RPU_TCM_COMB : PM_RPU_TCM_SPLIT;
> + return zynqmp_pm_set_tcm_config(z_rproc->pnode_id, tcm_mode);
> +}
> +
> +/*
> + * zynqmp_r5_rproc_mem_release
> + * @rproc: single R5 core's corresponding rproc instance
> + * @mem: mem entry to unmap
> + *
> + * Unmap TCM banks when powering down R5 core.
> + *
> + * return 0 on success, otherwise non-zero value on failure
> + */
> +static int tcm_mem_release(struct rproc *rproc, struct rproc_mem_entry *mem)
> +{
> + u32 pnode_id = (u64)mem->priv;
> +
> + iounmap(mem->va);
> + return zynqmp_pm_release_node(pnode_id);
> +}
> +
> +/*
> + * zynqmp_r5_rproc_start
> + * @rproc: single R5 core's corresponding rproc instance
> + *
> + * Start R5 Core from designated boot address.
> + *
> + * return 0 on success, otherwise non-zero value on failure
> + */
> +static int zynqmp_r5_rproc_start(struct rproc *rproc)
> +{
> + struct zynqmp_r5_rproc *z_rproc = rproc->priv;
> + enum rpu_boot_mem bootmem;
> +
> + bootmem = (rproc->bootaddr & 0xF0000000) == 0xF0000000 ?
> + PM_RPU_BOOTMEM_HIVEC : PM_RPU_BOOTMEM_LOVEC;
> +
> + dev_dbg(rproc->dev.parent, "RPU boot from %s.",
> + bootmem == PM_RPU_BOOTMEM_HIVEC ? "OCM" : "TCM");
> +
> + return zynqmp_pm_request_wake(z_rproc->pnode_id, 1,
> + bootmem, ZYNQMP_PM_REQUEST_ACK_NO);
> +}
> +
> +/*
> + * zynqmp_r5_rproc_stop
> + * @rproc: single R5 core's corresponding rproc instance
> + *
> + * Power down R5 Core.
> + *
> + * return 0 on success, otherwise non-zero value on failure
> + */
> +static int zynqmp_r5_rproc_stop(struct rproc *rproc)
> +{
> + struct zynqmp_r5_rproc *z_rproc = rproc->priv;
> +
> + return zynqmp_pm_force_pwrdwn(z_rproc->pnode_id,
> + ZYNQMP_PM_REQUEST_ACK_BLOCKING);
> +}
> +
> +/*
> + * zynqmp_r5_rproc_mem_alloc
> + * @rproc: single R5 core's corresponding rproc instance
> + * @mem: mem entry to map
> + *
> + * Callback to map va for memory-region's carveout.
> + *
> + * return 0 on success, otherwise non-zero value on failure
> + */
> +static int zynqmp_r5_rproc_mem_alloc(struct rproc *rproc,
> + struct rproc_mem_entry *mem)
> +{
> + void *va;
> +
> + va = ioremap_wc(mem->dma, mem->len);
> + if (IS_ERR_OR_NULL(va))
> + return -ENOMEM;
> +
> + mem->va = va;
> +
> + return 0;
> +}
> +
> +/*
> + * zynqmp_r5_rproc_mem_release
> + * @rproc: single R5 core's corresponding rproc instance
> + * @mem: mem entry to unmap
> + *
> + * Unmap memory-region carveout
> + *
> + * return 0 on success, otherwise non-zero value on failure
> + */
> +static int zynqmp_r5_rproc_mem_release(struct rproc *rproc,
> + struct rproc_mem_entry *mem)
> +{
> + iounmap(mem->va);
> + return 0;
> +}
> +
> +/*
> + * parse_mem_regions
> + * @rproc: single R5 core's corresponding rproc instance
> + *
> + * Construct rproc mem carveouts from carveout provided in
> + * memory-region property
> + *
> + * return 0 on success, otherwise non-zero value on failure
> + */
> +static int parse_mem_regions(struct rproc *rproc)
> +{
> + struct zynqmp_r5_rproc *z_rproc = rproc->priv;
> + struct device_node *np = z_rproc->dev->of_node;
> + struct device *dev = &rproc->dev;
> + struct of_phandle_iterator it;
> + struct rproc_mem_entry *mem;
> + struct reserved_mem *rmem;
> + int index = 0;
> +
> + /* Register associated reserved memory regions */
> + of_phandle_iterator_init(&it, np, DDR_LIST_PROP, NULL, 0);
> + while (of_phandle_iterator_next(&it) == 0) {
> + rmem = of_reserved_mem_lookup(it.node);
> + if (!rmem) {
> + dev_err(dev, "unable to acquire %s\n", DDR_LIST_PROP);
> + return -EINVAL;
> + }
> +
> + if (strstr(it.node->name, "vdev0buffer")) {
> + mem = rproc_of_resm_mem_entry_init(dev, index,
> + rmem->size,
> + rmem->base,
> + "vdev0buffer");
> + } else {
> + /*
> + * The ensuing carveout is either for vring, which has
> + * device tree node name of length 15 characters, or
> + * firmware mem, where name is not used by remoteproc
> + * core later on. So default to vring length of 15.
> + *
> + * Extra char for null-terminated string.
> + */
> + char name[16];
> +
> + if (strstr(it.node->name, "vdev0vring")) {
> + int vring_id;
> +
> + /*
> + * Expect "rpuXvdev0vringX" as documented
> + * in xilinx remoteproc device tree binding
> + */
> + if (strlen(it.node->name) < 15) {
> + dev_err(dev, "%pOF is less than 15 chars",
> + it.node);
> + return -EINVAL;
> + }
> +
> + /*
> + * can be 1 of multiple vring IDs per IPC channel
> + * e.g. 'vdev0vring0' and 'vdev0vring1'
> + *
> + * Here get vring ID from 15th char
> + */
> + vring_id = it.node->name[14] - '0';
> + snprintf(name, sizeof(name), "vdev0vring%d", vring_id);
> + } else {
> + strncpy(name, it.node->name, 16);
> + }
> +
> + 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);
> + }
> +
> + if (!mem)
> + return -ENOMEM;
> +
> + rproc_add_carveout(rproc, mem);
> + index++;
> + }
> +
> + return 0;
> +}
> +
> +/*
> + * zynqmp_r5_pm_request_tcm
> + * @addr: base address of mem provided in R5 core's sram property.
> + *
> + * Given sram base address, determine its corresponding Xilinx
> + * Platform Management ID and then request access to this node
> + * so that it can be power up.
> + *
> + * return 0 on success, otherwise non-zero value on failure
> + */
> +static int zynqmp_r5_pm_request_sram(phys_addr_t addr)
> +{
> + int i;
> +
> + for (i = 0; i < NUM_SRAMS; i++) {
> + if (zynqmp_banks[i].addr != addr)
> + continue;
> +
> + return zynqmp_pm_request_node(zynqmp_banks[i].id,
> + ZYNQMP_PM_CAPABILITY_ACCESS, 0,
> + ZYNQMP_PM_REQUEST_ACK_BLOCKING);
> + }
> +
> + return -EINVAL;
> +}
> +
> +/*
> + * tcm_mem_alloc
> + * @rproc: single R5 core's corresponding rproc instance
> + * @mem: mem entry to initialize the va and da fields of
> + *
> + * Given TCM bank entry, this callback will set device address for R5
> + * running on TCM and also setup virtual address for TCM bank
> + * remoteproc carveout.
> + *
> + * return 0 on success, otherwise non-zero value on failure
> + */
> +static int tcm_mem_alloc(struct rproc *rproc,
> + struct rproc_mem_entry *mem)
> +{
> + void *va;
> + struct device *dev = rproc->dev.parent;
> +
> + va = ioremap_wc(mem->dma, mem->len);
> + if (IS_ERR_OR_NULL(va))
> + return -ENOMEM;
> +
> + /* Update memory entry va */
> + mem->va = va;
> +
> + /*
> + * The R5s expect their TCM banks to be at address 0x0 and 0x2000,
> + * while on the Linux side they are at 0xffexxxxx.
> + *
> + * Zero out the high 12 bits of the address. This will give
> + * expected values for TCM Banks 0A and 0B (0x0 and 0x20000).
> + */
> + mem->da &= 0x000fffff;
> +
> + /*
> + * TCM Banks 1A and 1B still have to be translated.
> + *
> + * Below handle these two banks' absolute addresses (0xffe90000 and
> + * 0xffeb0000) and convert to the expected relative addresses
> + * (0x0 and 0x20000).
> + */
> + if (mem->da == 0x90000 || mem->da == 0xB0000)
> + mem->da -= 0x90000;
> +
> + /* if translated TCM bank address is not valid report error */
> + if (mem->da != 0x0 && mem->da != 0x20000) {
> + dev_err(dev, "invalid TCM bank address: %x\n", mem->da);
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +/*
> + * parse_tcm_banks()
> + * @rproc: single R5 core's corresponding rproc instance
> + *
> + * Given R5 node in remoteproc instance
> + * allocate remoteproc carveout for TCM memory
> + * needed for firmware to be loaded
> + *
> + * return 0 on success, otherwise non-zero value on failure
> + */
> +static int parse_tcm_banks(struct rproc *rproc)
> +{
> + int i, num_banks;
> + struct zynqmp_r5_rproc *z_rproc = rproc->priv;
> + struct device *dev = &rproc->dev;
> + struct device_node *r5_node = z_rproc->dev->of_node;
> +
> + /* go through TCM banks for r5 node */
> + num_banks = of_count_phandle_with_args(r5_node, BANK_LIST_PROP, NULL);
> + if (num_banks <= 0) {
> + dev_err(dev, "need to specify TCM banks\n");
> + return -EINVAL;
> + }
> + for (i = 0; i < num_banks; i++) {
> + struct resource rsc;
> + resource_size_t size;
> + struct device_node *dt_node;
> + struct rproc_mem_entry *mem;
> + int ret;
> + u32 pnode_id; /* zynqmp_pm* fn's expect u32 */
> +
> + dt_node = of_parse_phandle(r5_node, BANK_LIST_PROP, i);
> + if (!dt_node)
> + return -EINVAL;
> +
> + ret = of_address_to_resource(dt_node, 0, &rsc);
> + if (ret < 0) {
> + of_node_put(dt_node);
> + return ret;
> + }
> + of_node_put(dt_node);
> +
> + ret = zynqmp_r5_pm_request_sram(rsc.start);
> + if (ret < 0)
> + return ret;
> +
> + /* add carveout */
> + size = resource_size(&rsc);
> + mem = rproc_mem_entry_init(dev, NULL, rsc.start,
> + (size_t)size, rsc.start,
> + tcm_mem_alloc,
> + tcm_mem_release,
> + rsc.name);
> + if (!mem) {
> + ret = zynqmp_pm_release_node(pnode_id);
> + if (ret)
> + dev_warn(dev,
> + "fail to release node: %x ret: %x\n",
> + pnode_id, ret);
> + return -ENOMEM;
> + }
> +
> + mem->priv = (void *)(u64)pnode_id;
> + rproc_add_carveout(rproc, mem);
> + }
> +
> + return 0;
> +}
> +
> +/*
> + * zynqmp_r5_parse_fw()
> + * @rproc: single R5 core's corresponding rproc instance
> + * @fw: ptr to firmware to be loaded onto r5 core
> + *
> + * When loading firmware, ensure the necessary carveouts are in remoteproc
> + *
> + * return 0 on success, otherwise non-zero value on failure
> + */
> +static int zynqmp_r5_parse_fw(struct rproc *rproc, const struct firmware *fw)
> +{
> + int ret;
> +
> + ret = parse_tcm_banks(rproc);
> + if (ret)
> + return ret;
> +
> + ret = parse_mem_regions(rproc);
> + if (ret)
> + return ret;
> +
> + ret = rproc_elf_load_rsc_table(rproc, fw);
> + if (ret == -EINVAL) {
> + /*
> + * resource table only required for IPC.
> + * if not present, this is not necessarily an error;
> + * for example, loading r5 hello world application
> + * so simply inform user and keep going.
> + */
> + dev_info(&rproc->dev, "no resource table found.\n");
> + ret = 0;
> + }
> + return ret;
> +}
> +
> +/*
> + * zynqmp_r5_rproc_kick() - kick a firmware if mbox is provided
> + * @rproc: r5 core's corresponding rproc structure
> + * @vqid: virtqueue ID
> + */
> +static void zynqmp_r5_rproc_kick(struct rproc *rproc, int vqid)
> +{
> + struct zynqmp_r5_rproc *z_rproc = rproc->priv;
> + struct device *dev = rproc->dev.parent;
> + struct zynqmp_ipi_message *mb_msg = NULL;
> + unsigned int skb_len;
> + struct sk_buff *skb;
> + int ret;
> +
> + /* If vqid is negative, do not pass the vqid to
> + * mailbox as vqid is supposed to be 0 or positive.
> + * It also gives a way to just kick instead but
> + * not use the IPI buffer.
> + *
> + * 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 ZynqMP/Versal IPI message buffer.
> + */
> + if (vqid >= 0) {
> + skb_len = (unsigned int)(sizeof(vqid) + sizeof(mb_msg));
> + skb = alloc_skb(skb_len, GFP_KERNEL);
> + if (!skb)
> + 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(&z_rproc->tx_mc_skbs, skb);
> + }
> +
> + ret = mbox_send_message(z_rproc->tx_chan, mb_msg);
> + if (ret < 0) {
> + dev_warn(dev, "Failed to kick remote.\n");
> + if (mb_msg) {
> + skb_dequeue_tail(&z_rproc->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,
> +};
> +

I have reviewed from the end of the file to here (see comments below) and aside
from minor comments, things look good. I will review from here to the top
tomorrow.

Thanks,
Mathieu

> +/**
> + * 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;
> +
> + if (rproc_vq_interrupt(rproc, id) == IRQ_NONE)
> + dev_dbg(&rproc->dev, "no message was found in idr with id: %d\n", id);
> + return 0;
> +}
> +
> +/**
> + * handle_event_notified() - remoteproc notification work function
> + * @work: pointer to the work structure
> + *
> + * It checks each registered remoteproc notify IDs.
> + */
> +static void handle_event_notified(struct work_struct *work)
> +{
> + struct zynqmp_r5_rproc *z_rproc;
> + struct rproc *rproc;
> +
> + z_rproc = container_of(work, struct zynqmp_r5_rproc, mbox_work);
> + rproc = z_rproc->rproc;
> +
> + /*
> + * This is to simply raise interrupt as ACK for remote.
> + *
> + * Xilinx mailbox, ATF and SoC specific IPI mapping will handle
> + * mapping to remote processor.
> + */
> + if (mbox_send_message(z_rproc->rx_chan, NULL) < 0)
> + dev_warn(rproc->dev.parent, "Failed to kick remote.\n");
> +
> + /*
> + * 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
> + * @msg: message pointer
> + *
> + * It will schedule the R5 notification work.
> + */
> +static void zynqmp_r5_mb_rx_cb(struct mbox_client *cl, void *msg)
> +{
> + struct zynqmp_r5_rproc *z_rproc;
> +
> + z_rproc = container_of(cl, struct zynqmp_r5_rproc, rx_mc);
> + /*
> + * Notification can be received with message payload.
> + * To handle this, check for message contents.
> + * If there are contents, copy to ipi message buffer payload location.
> + *
> + * If message is empty, then that means that was simple raising
> + * of interrupt. no payload to process.
> + *
> + * Note: enqueue work regardless of msg as kick may imply that remote
> + * is waiting for ack.
> + */
> + if (msg) {
> + struct zynqmp_ipi_message *ipi_msg, *buf_msg;
> + size_t len;
> +
> + ipi_msg = (struct zynqmp_ipi_message *)msg;
> + buf_msg = (struct zynqmp_ipi_message *)z_rproc->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(&z_rproc->mbox_work);
> +}
> +
> +/**
> + * zynqmp_r5_mb_tx_done() - Request has been sent to the remote
> + * @cl: mailbox client
> + * @msg: 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 *msg, int r)
> +{
> + struct zynqmp_r5_rproc *z_rproc;
> + struct sk_buff *skb;
> +
> + if (!msg)
> + return;
> + z_rproc = container_of(cl, struct zynqmp_r5_rproc, tx_mc);
> + skb = skb_dequeue(&z_rproc->tx_mc_skbs);
> + kfree_skb(skb);
> +}
> +
> +/**
> + * zynqmp_r5_setup_mbox() - Setup mailboxes
> + * this is used for each individual R5 core
> + *
> + * @z_rproc: 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_rproc *z_rproc,
> + struct device_node *node)
> +{
> + struct mbox_client *mclient;
> +
> + /* Setup TX mailbox channel client */
> + mclient = &z_rproc->tx_mc;
> + mclient->dev = z_rproc->dev;
> + mclient->tx_done = zynqmp_r5_mb_tx_done;
> + mclient->tx_block = false;
> + mclient->knows_txdone = false;
> + mclient->rx_callback = NULL;
> +
> + /* Setup RX mailbox channel client */
> + mclient = &z_rproc->rx_mc;
> + mclient->dev = z_rproc->dev;
> + mclient->tx_done = NULL;
> + mclient->tx_block = false;
> + mclient->knows_txdone = false;
> + mclient->rx_callback = zynqmp_r5_mb_rx_cb;
> +
> + INIT_WORK(&z_rproc->mbox_work, handle_event_notified);
> +
> + /* Request TX and RX channels */
> + z_rproc->tx_chan = mbox_request_channel_byname(&z_rproc->tx_mc, "tx");
> + if (IS_ERR(z_rproc->tx_chan)) {
> + dev_err(z_rproc->dev, "failed to request mbox tx channel.\n");
> + return PTR_ERR(z_rproc->tx_chan);
> + }
> +
> + z_rproc->rx_chan = mbox_request_channel_byname(&z_rproc->rx_mc, "rx");
> + if (IS_ERR(z_rproc->rx_chan)) {
> + dev_err(z_rproc->dev, "failed to request mbox rx channel.\n");
> + return PTR_ERR(z_rproc->rx_chan);
> + }
> + skb_queue_head_init(&z_rproc->tx_mc_skbs);
> +
> + return 0;
> +}
> +
> +static void zynqmp_r5_cleanup_mbox(struct zynqmp_r5_rproc *z_rproc)
> +{
> + mbox_free_channel(z_rproc->tx_chan);
> + mbox_free_channel(z_rproc->rx_chan);
> +}
> +
> +/**
> + * zynqmp_r5_probe() - Probes ZynqMP R5 processor device node
> + * this is called for each individual R5 core to
> + * set up mailbox, Xilinx platform manager unique ID,
> + * add to rproc core
> + *
> + * @pdev: domain platform device for current R5 core
> + * @node: pointer of the device node for current R5 core
> + * @rpu_mode: mode to configure RPU, split or lockstep
> + *
> + * Return: 0 for success, negative value for failure.
> + */
> +static struct zynqmp_r5_rproc *zynqmp_r5_probe(struct platform_device *pdev,
> + struct device_node *node,
> + enum rpu_oper_mode rpu_mode)
> +{
> + int ret;
> + struct device *dev = &pdev->dev;
> + struct rproc *rproc_ptr;
> + struct zynqmp_r5_rproc *z_rproc;
> +
> + /* Allocate remoteproc instance */
> + rproc_ptr = devm_rproc_alloc(dev, dev_name(dev), &zynqmp_r5_rproc_ops,
> + NULL, sizeof(struct zynqmp_r5_rproc));
> + if (!rproc_ptr) {
> + ret = -ENOMEM;
> + goto error;
> + }
> +
> + rproc_ptr->auto_boot = false;
> + z_rproc = rproc_ptr->priv;
> + z_rproc->rproc = rproc_ptr;
> + z_rproc->dev = dev;

Here z_rproc->dev is the same as z_rproc->rproc->dev->parent and as far as I can
tell z_rproc->rproc is available where z_rproc->dev is used. As such
zynqmpq_r5_rproc::dev can likely be removed.

> +
> + /* Set up DMA mask */
> + ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
> + if (ret)
> + goto error;
> +
> + /* Get R5 power domain node */
> + ret = of_property_read_u32(node, "power-domain", &z_rproc->pnode_id);
> + if (ret)
> + goto error;
> +
> + ret = r5_set_mode(z_rproc, rpu_mode);
> + if (ret)
> + goto error;
> +
> + if (of_property_read_bool(node, "mboxes")) {
> + ret = zynqmp_r5_setup_mbox(z_rproc, node);
> + if (ret)
> + goto error;
> + }
> +
> + /* Add R5 remoteproc */
> + ret = devm_rproc_add(dev, rproc_ptr);
> + if (ret) {
> + zynqmp_r5_cleanup_mbox(z_rproc);
> + goto error;
> + }
> +
> + return z_rproc;
> +error:
> + return ERR_PTR(ret);
> +}
> +
> +/*
> + * zynqmp_r5_remoteproc_probe()
> + *
> + * @pdev: domain platform device for R5 cluster
> + *
> + * called when driver is probed, for each R5 core specified in DT,
> + * setup as needed to do remoteproc-related operations
> + *
> + * Return: 0 for success, negative value for failure.
> + */
> +static int zynqmp_r5_remoteproc_probe(struct platform_device *pdev)
> +{
> + int ret, core_count;
> + struct device *dev = &pdev->dev;
> + struct device_node *nc;
> + enum rpu_oper_mode rpu_mode = PM_RPU_MODE_LOCKSTEP;
> + struct list_head *cluster; /* list to track each core's rproc */
> + struct zynqmp_r5_rproc *z_rproc;
> + struct platform_device *child_pdev;
> + struct list_head *pos;
> +
> + ret = of_property_read_u32(dev->of_node, "xlnx,cluster-mode", &rpu_mode);
> + if (ret < 0 || (rpu_mode != PM_RPU_MODE_LOCKSTEP &&
> + rpu_mode != PM_RPU_MODE_SPLIT)) {
> + dev_err(dev, "invalid cluster mode: ret %d mode %x\n",
> + ret, rpu_mode);
> + return ret;
> + }
> +
> + dev_dbg(dev, "RPU configuration: %s\n",
> + rpu_mode == PM_RPU_MODE_LOCKSTEP ? "lockstep" : "split");
> +
> + /*
> + * if 2 RPUs provided but one is lockstep, then we have an
> + * invalid configuration.
> + */
> +
> + core_count = of_get_available_child_count(dev->of_node);
> + if ((rpu_mode == PM_RPU_MODE_LOCKSTEP && core_count != 1) ||
> + core_count > MAX_RPROCS)
> + return -EINVAL;
> +
> + cluster = devm_kzalloc(dev, sizeof(*cluster), GFP_KERNEL);
> + if (!cluster)
> + return -ENOMEM;
> + INIT_LIST_HEAD(cluster);
> +
> + ret = devm_of_platform_populate(dev);
> + if (ret) {
> + dev_err(dev, "devm_of_platform_populate failed, ret = %d\n",
> + ret);

You can move the above "ret);" to the above line to avoid breaking it. The 80
character per line rule was relaxed for cases like these.

> + return ret;
> + }
> +
> + /* probe each individual r5 core's remoteproc-related info */
> + for_each_available_child_of_node(dev->of_node, nc) {
> + child_pdev = of_find_device_by_node(nc);
> + if (!child_pdev) {
> + dev_err(dev, "could not get R5 core platform device\n");
> + ret = -ENODEV;
> + goto out;
> + }
> +
> + z_rproc = zynqmp_r5_probe(child_pdev, nc, rpu_mode);
> + dev_dbg(dev, "%s to probe rpu %pOF\n",
> + ret ? "Failed" : "Able",
> + nc);

Staking - "nc);" could easily be on the previous line.

> + if (IS_ERR(z_rproc)) {
> + ret = PTR_ERR(z_rproc);
> + goto out;
> + }
> + list_add_tail(&z_rproc->elem, cluster);
> + }
> + /* wire in so each core can be cleaned up at driver remove */
> + platform_set_drvdata(pdev, cluster);
> + return 0;
> +out:
> + /*
> + * undo core0 upon any failures on core1 in split-mode
> + *
> + * in zynqmp_r5_probe z_rproc is set to null
> + * and ret to non-zero value if error

Not sure this comment applies anymore.

> + */
> + list_for_each(pos, cluster) {
> + z_rproc = list_entry(pos, struct zynqmp_r5_rproc, elem);
> + zynqmp_r5_cleanup_mbox(z_rproc);
> + }
> + return ret;
> +}
> +
> +/*
> + * zynqmp_r5_remoteproc_remove()
> + *
> + * @pdev: domain platform device for R5 cluster
> + *
> + * When the driver is unloaded, clean up the mailboxes for each
> + * remoteproc that was initially probed.
> + */
> +static int zynqmp_r5_remoteproc_remove(struct platform_device *pdev)
> +{
> + struct list_head *pos, *temp, *cluster = (struct list_head *)
> + platform_get_drvdata(pdev);
> + struct zynqmp_r5_rproc *z_rproc = NULL;
> +
> + list_for_each_safe(pos, temp, cluster) {
> + z_rproc = list_entry(pos, struct zynqmp_r5_rproc, elem);
> + zynqmp_r5_cleanup_mbox(z_rproc);
> + list_del(pos);

In zynqmp_r5_remoteproc_probe() the element is not removed. It doesn't make a
difference since the list isn't used for anything after this. Regardless, pick
a heuristic and stick with it.

> + }
> + return 0;
> +}
> +
> +/* Match table for OF platform binding */
> +static const struct of_device_id zynqmp_r5_remoteproc_match[] = {
> + { .compatible = "xlnx,zynqmp-r5-remoteproc", },
> + { /* 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_AUTHOR("Ben Levinsky <ben.levinsky@xilinx.com>");
> +MODULE_LICENSE("GPL v2");
> --
> 2.17.1
>

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