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Message-ID: <20180723163824.4wbstg3zet72oord@us-sjc-wireless-10-16-34-45.amer.corp.natinst.com>
Date: Mon, 23 Jul 2018 09:38:24 -0700
From: Moritz Fischer <mdf@...nel.org>
To: richard.gong@...ux.intel.com
Cc: gregkh@...uxfoundation.org, catalin.marinas@....com,
will.deacon@....com, dinguyen@...nel.org, robh+dt@...nel.org,
mark.rutland@....com, atull@...nel.org, mdf@...nel.org,
arnd@...db.de, corbet@....net,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org, linux-fpga@...r.kernel.org,
linux-doc@...r.kernel.org, yves.vandervennet@...ux.intel.com,
richard.gong@...el.com
Subject: Re: [PATCHv7 6/9] fpga: add intel stratix10 soc fpga manager driver
Hi Alan, Richard,
On Wed, Jul 18, 2018 at 11:18:41AM -0500, richard.gong@...ux.intel.com wrote:
> From: Alan Tull <atull@...nel.org>
>
> Add driver for reconfiguring Intel Stratix10 SoC FPGA devices.
> This driver communicates through the Intel Service Driver which
> does communication with privileged hardware (that does the
> FPGA programming) through a secure mailbox.
>
> Signed-off-by: Alan Tull <atull@...nel.org>
> Signed-off-by: Richard Gong <richard.gong@...el.com>
Acked-by: Moritz Fischer <mdf@...nel.org>
> ---
> v2: this patch is added in patch set version 2
> v3: change to align to the update of service client APIs, and the
> update of fpga_mgr device node
> v4: changes to align with stratix10-svc-client API updates
> add Richard's signed-off-by
> v5: update to align changes at service layer to minimize service
> layer thread usages
> v6: add S10_RECONFIG_TIMEOUT
> rename s/S10_BUF_TIMEOUT/S10_BUFFER_TIMEOUT/
> fix klocwork errors
> v7: s/pr_debug/dev_dbg, s/dev_info/dev_dbg
> add unlock buffer if s10_svc_send_msg() fails
> add release channel if fpga_mgr_create() fails
> ---
> drivers/fpga/Kconfig | 6 +
> drivers/fpga/Makefile | 1 +
> drivers/fpga/stratix10-soc.c | 558 +++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 565 insertions(+)
> create mode 100644 drivers/fpga/stratix10-soc.c
>
> diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig
> index ee9c542..7d20743 100644
> --- a/drivers/fpga/Kconfig
> +++ b/drivers/fpga/Kconfig
> @@ -56,6 +56,12 @@ config FPGA_MGR_ZYNQ_FPGA
> help
> FPGA manager driver support for Xilinx Zynq FPGAs.
>
> +config FPGA_MGR_STRATIX10_SOC
> + tristate "Intel Stratix10 SoC FPGA Manager"
> + depends on (ARCH_STRATIX10 && STRATIX10_SERVICE)
> + help
> + FPGA manager driver support for the Intel Stratix10 SoC.
> +
> config FPGA_MGR_XILINX_SPI
> tristate "Xilinx Configuration over Slave Serial (SPI)"
> depends on SPI
> diff --git a/drivers/fpga/Makefile b/drivers/fpga/Makefile
> index f9803da..9f17b7f 100644
> --- a/drivers/fpga/Makefile
> +++ b/drivers/fpga/Makefile
> @@ -13,6 +13,7 @@ obj-$(CONFIG_FPGA_MGR_ICE40_SPI) += ice40-spi.o
> obj-$(CONFIG_FPGA_MGR_MACHXO2_SPI) += machxo2-spi.o
> obj-$(CONFIG_FPGA_MGR_SOCFPGA) += socfpga.o
> obj-$(CONFIG_FPGA_MGR_SOCFPGA_A10) += socfpga-a10.o
> +obj-$(CONFIG_FPGA_MGR_STRATIX10_SOC) += stratix10-soc.o
> obj-$(CONFIG_FPGA_MGR_TS73XX) += ts73xx-fpga.o
> obj-$(CONFIG_FPGA_MGR_XILINX_SPI) += xilinx-spi.o
> obj-$(CONFIG_FPGA_MGR_ZYNQ_FPGA) += zynq-fpga.o
> diff --git a/drivers/fpga/stratix10-soc.c b/drivers/fpga/stratix10-soc.c
> new file mode 100644
> index 0000000..f34830d
> --- /dev/null
> +++ b/drivers/fpga/stratix10-soc.c
> @@ -0,0 +1,558 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * FPGA Manager Driver for Intel Stratix10 SoC
> + *
> + * Copyright (C) 2018 Intel Corporation
> + */
> +#include <linux/completion.h>
> +#include <linux/fpga/fpga-mgr.h>
> +#include <linux/stratix10-svc-client.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_platform.h>
> +
> +/*
> + * FPGA programming requires a higher level of privilege (EL3), per the SoC
> + * design.
> + */
> +#define NUM_SVC_BUFS 4
> +#define SVC_BUF_SIZE SZ_512K
> +
> +/* Indicates buffer is in use if set */
> +#define SVC_BUF_LOCK 0
> +
> +#define S10_BUFFER_TIMEOUT (msecs_to_jiffies(SVC_RECONFIG_BUFFER_TIMEOUT_MS))
> +#define S10_RECONFIG_TIMEOUT (msecs_to_jiffies(SVC_RECONFIG_REQUEST_TIMEOUT_MS))
> +
> +/**
> + * struct s10_svc_buf
> + * @buf: virtual address of buf provided by service layer
> + * @lock: locked if buffer is in use
> + */
> +struct s10_svc_buf {
> + char *buf;
> + unsigned long lock;
> +};
> +
> +struct s10_priv {
> + struct stratix10_svc_chan *chan;
> + struct stratix10_svc_client client;
> + struct completion status_return_completion;
> + struct s10_svc_buf svc_bufs[NUM_SVC_BUFS];
> + unsigned long status;
> +};
> +
> +static int s10_svc_send_msg(struct s10_priv *priv,
> + enum stratix10_svc_command_code command,
> + void *payload, u32 payload_length)
> +{
> + struct stratix10_svc_chan *chan = priv->chan;
> + struct device *dev = priv->client.dev;
> + struct stratix10_svc_client_msg msg;
> + int ret;
> +
> + dev_dbg(dev, "%s cmd=%d payload=%p length=%d\n",
> + __func__, command, payload, payload_length);
> +
> + msg.command = command;
> + msg.payload = payload;
> + msg.payload_length = payload_length;
> +
> + ret = stratix10_svc_send(chan, &msg);
> + dev_dbg(dev, "stratix10_svc_send returned status %d\n", ret);
> +
> + return ret;
> +}
> +
> +/**
> + * s10_free_buffers
> + * Free buffers allocated from the service layer's pool that are not in use.
> + * @mgr: fpga manager struct
> + * Free all buffers that are not in use.
> + * Return true when all buffers are freed.
> + */
> +static bool s10_free_buffers(struct fpga_manager *mgr)
> +{
> + struct s10_priv *priv = mgr->priv;
> + uint num_free = 0;
> + uint i;
> +
> + for (i = 0; i < NUM_SVC_BUFS; i++) {
> + if (!priv->svc_bufs[i].buf) {
> + num_free++;
> + continue;
> + }
> +
> + if (!test_and_set_bit_lock(SVC_BUF_LOCK,
> + &priv->svc_bufs[i].lock)) {
> + stratix10_svc_free_memory(priv->chan,
> + priv->svc_bufs[i].buf);
> + priv->svc_bufs[i].buf = NULL;
> + num_free++;
> + }
> + }
> +
> + return num_free == NUM_SVC_BUFS;
> +}
> +
> +/**
> + * s10_free_buffer_count
> + * Count how many buffers are not in use.
> + * @mgr: fpga manager struct
> + * Return # of buffers that are not in use.
> + */
> +static uint s10_free_buffer_count(struct fpga_manager *mgr)
> +{
> + struct s10_priv *priv = mgr->priv;
> + uint num_free = 0;
> + uint i;
> +
> + for (i = 0; i < NUM_SVC_BUFS; i++)
> + if (!priv->svc_bufs[i].buf)
> + num_free++;
> +
> + return num_free;
> +}
> +
> +/**
> + * s10_unlock_bufs
> + * Given the returned buffer address, match that address to our buffer struct
> + * and unlock that buffer. This marks it as available to be refilled and sent
> + * (or freed).
> + * @priv: private data
> + * @kaddr: kernel address of buffer that was returned from service layer
> + */
> +static void s10_unlock_bufs(struct s10_priv *priv, void *kaddr)
> +{
> + uint i;
> +
> + if (!kaddr)
> + return;
> +
> + for (i = 0; i < NUM_SVC_BUFS; i++)
> + if (priv->svc_bufs[i].buf == kaddr) {
> + clear_bit_unlock(SVC_BUF_LOCK,
> + &priv->svc_bufs[i].lock);
> + return;
> + }
> +
> + WARN(1, "Unknown buffer returned from service layer %p\n", kaddr);
> +}
> +
> +/**
> + * s10_receive_callback
> + * Callback for service layer to use to provide client (this driver) messages
> + * received through the mailbox.
> + * @client: service layer client struct
> + * @data: message
> + */
> +static void s10_receive_callback(struct stratix10_svc_client *client,
> + struct stratix10_svc_cb_data *data)
> +{
> + struct s10_priv *priv = client->priv;
> + u32 status;
> + int i;
> +
> + WARN_ONCE(!data, "%s: stratix10_svc_rc_data = NULL", __func__);
> +
> + status = data->status;
> +
> + /*
> + * Here we set status bits as we receive them. Elsewhere, we always use
> + * test_and_clear_bit() to check status in priv->status
> + */
> + for (i = 0; i <= SVC_STATUS_RECONFIG_ERROR; i++)
> + if (status & (1 << i))
> + set_bit(i, &priv->status);
> +
> + if (status & BIT(SVC_STATUS_RECONFIG_BUFFER_DONE)) {
> + s10_unlock_bufs(priv, data->kaddr1);
> + s10_unlock_bufs(priv, data->kaddr2);
> + s10_unlock_bufs(priv, data->kaddr3);
> + }
> +
> + complete(&priv->status_return_completion);
> +}
> +
> +/**
> + * s10_ops_write_init
> + * Prepare for FPGA reconfiguration by requesting partial reconfig and
> + * allocating buffers from the service layer.
> + * @mgr: fpga manager
> + * @info: fpga image info
> + * @buf: fpga image buffer
> + * @count: size of buf in bytes
> + */
> +static int s10_ops_write_init(struct fpga_manager *mgr,
> + struct fpga_image_info *info,
> + const char *buf, size_t count)
> +{
> + struct s10_priv *priv = mgr->priv;
> + struct device *dev = priv->client.dev;
> + struct stratix10_svc_command_reconfig_payload payload;
> + char *kbuf;
> + uint i;
> + int ret;
> +
> + payload.flags = 0;
> + if (info->flags & FPGA_MGR_PARTIAL_RECONFIG) {
> + dev_dbg(dev, "Requesting partial reconfiguration.\n");
> + payload.flags |= BIT(COMMAND_RECONFIG_FLAG_PARTIAL);
> + } else {
> + dev_dbg(dev, "Requesting full reconfiguration.\n");
> + }
> +
> + reinit_completion(&priv->status_return_completion);
> + ret = s10_svc_send_msg(priv, COMMAND_RECONFIG,
> + &payload, sizeof(payload));
> + if (ret < 0)
> + goto init_done;
> +
> + ret = wait_for_completion_interruptible_timeout(
> + &priv->status_return_completion, S10_RECONFIG_TIMEOUT);
> + if (!ret) {
> + dev_err(dev, "timeout waiting for RECONFIG_REQUEST\n");
> + ret = -ETIMEDOUT;
> + goto init_done;
> + }
> + if (ret < 0) {
> + dev_err(dev, "error (%d) waiting for RECONFIG_REQUEST\n", ret);
> + goto init_done;
> + }
> +
> + ret = 0;
> + if (!test_and_clear_bit(SVC_STATUS_RECONFIG_REQUEST_OK,
> + &priv->status)) {
> + ret = -ETIMEDOUT;
> + goto init_done;
> + }
> +
> + /* Allocate buffers from the service layer's pool. */
> + for (i = 0; i < NUM_SVC_BUFS; i++) {
> + kbuf = stratix10_svc_allocate_memory(priv->chan, SVC_BUF_SIZE);
> + if (!kbuf) {
> + s10_free_buffers(mgr);
> + ret = -ENOMEM;
> + goto init_done;
> + }
> +
> + priv->svc_bufs[i].buf = kbuf;
> + priv->svc_bufs[i].lock = 0;
> + }
> +
> +init_done:
> + stratix10_svc_done(priv->chan);
> + return ret;
> +}
> +
> +/**
> + * s10_send_buf
> + * Send a buffer to the service layer queue
> + * @mgr: fpga manager struct
> + * @buf: fpga image buffer
> + * @count: size of buf in bytes
> + * Returns # of bytes transferred or -ENOBUFS if the all the buffers are in use
> + * or if the service queue is full. Never returns 0.
> + */
> +static int s10_send_buf(struct fpga_manager *mgr, const char *buf, size_t count)
> +{
> + struct s10_priv *priv = mgr->priv;
> + struct device *dev = priv->client.dev;
> + void *svc_buf;
> + size_t xfer_sz;
> + int ret;
> + uint i;
> +
> + /* get/lock a buffer that that's not being used */
> + for (i = 0; i < NUM_SVC_BUFS; i++)
> + if (!test_and_set_bit_lock(SVC_BUF_LOCK,
> + &priv->svc_bufs[i].lock))
> + break;
> +
> + if (i == NUM_SVC_BUFS)
> + return -ENOBUFS;
> +
> + xfer_sz = count < SVC_BUF_SIZE ? count : SVC_BUF_SIZE;
> +
> + svc_buf = priv->svc_bufs[i].buf;
> + memcpy(svc_buf, buf, xfer_sz);
> + ret = s10_svc_send_msg(priv, COMMAND_RECONFIG_DATA_SUBMIT,
> + svc_buf, xfer_sz);
> + if (ret < 0) {
> + dev_err(dev,
> + "Error while sending data to service layer (%d)", ret);
> + clear_bit_unlock(SVC_BUF_LOCK, &priv->svc_bufs[i].lock);
> + return ret;
> + }
> +
> + return xfer_sz;
> +}
> +
> +/**
> + * s10_ops_write
> + * Send a FPGA image to privileged layers to write to the FPGA. When done
> + * sending, free all service layer buffers we allocated in write_init.
> + * @mgr: fpga manager
> + * @buf: fpga image buffer
> + * @count: size of buf in bytes
> + * Returns 0 for success or negative errno.
> + */
> +static int s10_ops_write(struct fpga_manager *mgr, const char *buf,
> + size_t count)
> +{
> + struct s10_priv *priv = mgr->priv;
> + struct device *dev = priv->client.dev;
> + long wait_status;
> + int sent = 0;
> + int ret = 0;
> +
> + /*
> + * Loop waiting for buffers to be returned. When a buffer is returned,
> + * reuse it to send more data or free if if all data has been sent.
> + */
> + while (count > 0 || s10_free_buffer_count(mgr) != NUM_SVC_BUFS) {
> + reinit_completion(&priv->status_return_completion);
> +
> + if (count > 0) {
> + sent = s10_send_buf(mgr, buf, count);
> + if (sent < 0)
> + continue;
> +
> + count -= sent;
> + buf += sent;
> + } else {
> + if (s10_free_buffers(mgr))
> + return 0;
> +
> + ret = s10_svc_send_msg(
> + priv, COMMAND_RECONFIG_DATA_CLAIM,
> + NULL, 0);
> + if (ret < 0)
> + break;
> + }
> +
> + /*
> + * If callback hasn't already happened, wait for buffers to be
> + * returned from service layer
> + */
> + wait_status = 1; /* not timed out */
> + if (!priv->status)
> + wait_status = wait_for_completion_interruptible_timeout(
> + &priv->status_return_completion,
> + S10_BUFFER_TIMEOUT);
> +
> + if (test_and_clear_bit(SVC_STATUS_RECONFIG_BUFFER_DONE,
> + &priv->status) ||
> + test_and_clear_bit(SVC_STATUS_RECONFIG_BUFFER_SUBMITTED,
> + &priv->status)) {
> + ret = 0;
> + continue;
> + }
> +
> + if (test_and_clear_bit(SVC_STATUS_RECONFIG_ERROR,
> + &priv->status)) {
> + dev_err(dev, "ERROR - giving up - SVC_STATUS_RECONFIG_ERROR\n");
> + ret = -EFAULT;
> + break;
> + }
> +
> + if (!wait_status) {
> + dev_err(dev, "timeout waiting for svc layer buffers\n");
> + ret = -ETIMEDOUT;
> + break;
> + }
> + if (wait_status < 0) {
> + ret = wait_status;
> + dev_err(dev,
> + "error (%d) waiting for svc layer buffers\n",
> + ret);
> + break;
> + }
> + }
> +
> + if (!s10_free_buffers(mgr))
> + dev_err(dev, "%s not all buffers were freed\n", __func__);
> +
> + return ret;
> +}
> +
> +/**
> + * s10_ops_write_complete
> + * Wait for FPGA configuration to be done
> + * @mgr: fpga manager
> + * @info: fpga image info
> + * Returns 0 for success negative errno.
> + */
> +static int s10_ops_write_complete(struct fpga_manager *mgr,
> + struct fpga_image_info *info)
> +{
> + struct s10_priv *priv = mgr->priv;
> + struct device *dev = priv->client.dev;
> + unsigned long timeout;
> + int ret;
> +
> + timeout = usecs_to_jiffies(info->config_complete_timeout_us);
> +
> + do {
> + reinit_completion(&priv->status_return_completion);
> +
> + ret = s10_svc_send_msg(priv, COMMAND_RECONFIG_STATUS, NULL, 0);
> + if (ret < 0)
> + break;
> +
> + ret = wait_for_completion_interruptible_timeout(
> + &priv->status_return_completion, timeout);
> + if (!ret) {
> + dev_err(dev,
> + "timeout waiting for RECONFIG_COMPLETED\n");
> + ret = -ETIMEDOUT;
> + break;
> + }
> + if (ret < 0) {
> + dev_err(dev,
> + "error (%d) waiting for RECONFIG_COMPLETED\n",
> + ret);
> + break;
> + }
> + /* Not error or timeout, so ret is # of jiffies until timeout */
> + timeout = ret;
> + ret = 0;
> +
> + if (test_and_clear_bit(SVC_STATUS_RECONFIG_COMPLETED,
> + &priv->status))
> + break;
> +
> + if (test_and_clear_bit(SVC_STATUS_RECONFIG_ERROR,
> + &priv->status)) {
> + dev_err(dev, "ERROR - giving up - SVC_STATUS_RECONFIG_ERROR\n");
> + ret = -EFAULT;
> + break;
> + }
> + } while (1);
> +
> + stratix10_svc_done(priv->chan);
> +
> + return ret;
> +}
> +
> +static enum fpga_mgr_states s10_ops_state(struct fpga_manager *mgr)
> +{
> + return FPGA_MGR_STATE_UNKNOWN;
> +}
> +
> +static const struct fpga_manager_ops s10_ops = {
> + .state = s10_ops_state,
> + .write_init = s10_ops_write_init,
> + .write = s10_ops_write,
> + .write_complete = s10_ops_write_complete,
> +};
> +
> +static int s10_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct s10_priv *priv;
> + struct fpga_manager *mgr;
> + int ret;
> +
> + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> + if (!priv)
> + return -ENOMEM;
> +
> + priv->client.dev = dev;
> + priv->client.receive_cb = s10_receive_callback;
> + priv->client.priv = priv;
> +
> + priv->chan = stratix10_svc_request_channel_byname(&priv->client,
> + SVC_CLIENT_FPGA);
> + if (IS_ERR(priv->chan)) {
> + dev_err(dev, "couldn't get service channel (%s)\n",
> + SVC_CLIENT_FPGA);
> + return PTR_ERR(priv->chan);
> + }
> +
> + init_completion(&priv->status_return_completion);
> +
> + mgr = fpga_mgr_create(dev, "Stratix10 SOC FPGA Manager",
> + &s10_ops, priv);
> + if (!mgr) {
> + dev_err(dev, "unable to create FPGA manager\n");
> + stratix10_svc_free_channel(priv->chan);
> + return -ENOMEM;
Would this be shorter with a goto and common error handling at
the end of the function?
> + }
> +
> + ret = fpga_mgr_register(mgr);
> + if (ret) {
> + dev_err(dev, "unable to register FPGA manager\n");
> + stratix10_svc_free_channel(priv->chan);
> + fpga_mgr_free(mgr);
> + return ret;
> + }
> +
> + platform_set_drvdata(pdev, mgr);
> +
> + return ret;
> +}
> +
> +static int s10_remove(struct platform_device *pdev)
> +{
> + struct fpga_manager *mgr = platform_get_drvdata(pdev);
> + struct s10_priv *priv = mgr->priv;
> +
> + fpga_mgr_unregister(mgr);
> + stratix10_svc_free_channel(priv->chan);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id s10_of_match[] = {
> + { .compatible = "intel,stratix10-soc-fpga-mgr", },
> + {},
> +};
> +
> +MODULE_DEVICE_TABLE(of, s10_of_match);
> +
> +static struct platform_driver s10_driver = {
> + .probe = s10_probe,
> + .remove = s10_remove,
> + .driver = {
> + .name = "Stratix10 SoC FPGA manager",
> + .of_match_table = of_match_ptr(s10_of_match),
> + },
> +};
> +
> +static int __init s10_init(void)
> +{
> + struct device_node *fw_np;
> + struct device_node *np;
> + int ret;
> +
> + fw_np = of_find_node_by_name(NULL, "svc");
> + if (!fw_np)
> + return -ENODEV;
> +
> + np = of_find_matching_node(fw_np, s10_of_match);
> + if (!np) {
> + of_node_put(fw_np);
> + return -ENODEV;
> + }
> +
> + of_node_put(np);
> + ret = of_platform_populate(fw_np, s10_of_match, NULL, NULL);
> + of_node_put(fw_np);
> + if (ret)
> + return ret;
> +
> + return platform_driver_register(&s10_driver);
> +}
> +
> +static void __exit s10_exit(void)
> +{
> + return platform_driver_unregister(&s10_driver);
> +}
> +
> +module_init(s10_init);
> +module_exit(s10_exit);
> +
> +MODULE_AUTHOR("Alan Tull <atull@...nel.org>");
> +MODULE_DESCRIPTION("Intel Stratix 10 SOC FPGA Manager");
> +MODULE_LICENSE("GPL v2");
> --
> 2.7.4
>
Thanks,
Moritz
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