diff options
Diffstat (limited to 'drivers/fpga/dfl-fme-pr.c')
| -rw-r--r-- | drivers/fpga/dfl-fme-pr.c | 479 |
1 files changed, 479 insertions, 0 deletions
diff --git a/drivers/fpga/dfl-fme-pr.c b/drivers/fpga/dfl-fme-pr.c new file mode 100644 index 000000000..0b840531e --- /dev/null +++ b/drivers/fpga/dfl-fme-pr.c @@ -0,0 +1,479 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Driver for FPGA Management Engine (FME) Partial Reconfiguration + * + * Copyright (C) 2017-2018 Intel Corporation, Inc. + * + * Authors: + * Kang Luwei <luwei.kang@intel.com> + * Xiao Guangrong <guangrong.xiao@linux.intel.com> + * Wu Hao <hao.wu@intel.com> + * Joseph Grecco <joe.grecco@intel.com> + * Enno Luebbers <enno.luebbers@intel.com> + * Tim Whisonant <tim.whisonant@intel.com> + * Ananda Ravuri <ananda.ravuri@intel.com> + * Christopher Rauer <christopher.rauer@intel.com> + * Henry Mitchel <henry.mitchel@intel.com> + */ + +#include <linux/types.h> +#include <linux/device.h> +#include <linux/vmalloc.h> +#include <linux/uaccess.h> +#include <linux/fpga/fpga-mgr.h> +#include <linux/fpga/fpga-bridge.h> +#include <linux/fpga/fpga-region.h> +#include <linux/fpga-dfl.h> + +#include "dfl.h" +#include "dfl-fme.h" +#include "dfl-fme-pr.h" + +static struct dfl_fme_region * +dfl_fme_region_find_by_port_id(struct dfl_fme *fme, int port_id) +{ + struct dfl_fme_region *fme_region; + + list_for_each_entry(fme_region, &fme->region_list, node) + if (fme_region->port_id == port_id) + return fme_region; + + return NULL; +} + +static int dfl_fme_region_match(struct device *dev, const void *data) +{ + return dev->parent == data; +} + +static struct fpga_region *dfl_fme_region_find(struct dfl_fme *fme, int port_id) +{ + struct dfl_fme_region *fme_region; + struct fpga_region *region; + + fme_region = dfl_fme_region_find_by_port_id(fme, port_id); + if (!fme_region) + return NULL; + + region = fpga_region_class_find(NULL, &fme_region->region->dev, + dfl_fme_region_match); + if (!region) + return NULL; + + return region; +} + +static int fme_pr(struct platform_device *pdev, unsigned long arg) +{ + struct dfl_feature_platform_data *pdata = dev_get_platdata(&pdev->dev); + void __user *argp = (void __user *)arg; + struct dfl_fpga_fme_port_pr port_pr; + struct fpga_image_info *info; + struct fpga_region *region; + void __iomem *fme_hdr; + struct dfl_fme *fme; + unsigned long minsz; + void *buf = NULL; + int ret = 0; + u64 v; + + minsz = offsetofend(struct dfl_fpga_fme_port_pr, buffer_address); + + if (copy_from_user(&port_pr, argp, minsz)) + return -EFAULT; + + if (port_pr.argsz < minsz || port_pr.flags) + return -EINVAL; + + if (!IS_ALIGNED(port_pr.buffer_size, 4)) + return -EINVAL; + + /* get fme header region */ + fme_hdr = dfl_get_feature_ioaddr_by_id(&pdev->dev, + FME_FEATURE_ID_HEADER); + + /* check port id */ + v = readq(fme_hdr + FME_HDR_CAP); + if (port_pr.port_id >= FIELD_GET(FME_CAP_NUM_PORTS, v)) { + dev_dbg(&pdev->dev, "port number more than maximum\n"); + return -EINVAL; + } + + if (!access_ok(VERIFY_READ, + (void __user *)(unsigned long)port_pr.buffer_address, + port_pr.buffer_size)) + return -EFAULT; + + buf = vmalloc(port_pr.buffer_size); + if (!buf) + return -ENOMEM; + + if (copy_from_user(buf, + (void __user *)(unsigned long)port_pr.buffer_address, + port_pr.buffer_size)) { + ret = -EFAULT; + goto free_exit; + } + + /* prepare fpga_image_info for PR */ + info = fpga_image_info_alloc(&pdev->dev); + if (!info) { + ret = -ENOMEM; + goto free_exit; + } + + info->flags |= FPGA_MGR_PARTIAL_RECONFIG; + + mutex_lock(&pdata->lock); + fme = dfl_fpga_pdata_get_private(pdata); + /* fme device has been unregistered. */ + if (!fme) { + ret = -EINVAL; + goto unlock_exit; + } + + region = dfl_fme_region_find(fme, port_pr.port_id); + if (!region) { + ret = -EINVAL; + goto unlock_exit; + } + + fpga_image_info_free(region->info); + + info->buf = buf; + info->count = port_pr.buffer_size; + info->region_id = port_pr.port_id; + region->info = info; + + ret = fpga_region_program_fpga(region); + + /* + * it allows userspace to reset the PR region's logic by disabling and + * reenabling the bridge to clear things out between accleration runs. + * so no need to hold the bridges after partial reconfiguration. + */ + if (region->get_bridges) + fpga_bridges_put(®ion->bridge_list); + + put_device(®ion->dev); +unlock_exit: + mutex_unlock(&pdata->lock); +free_exit: + vfree(buf); + if (copy_to_user((void __user *)arg, &port_pr, minsz)) + return -EFAULT; + + return ret; +} + +/** + * dfl_fme_create_mgr - create fpga mgr platform device as child device + * + * @pdata: fme platform_device's pdata + * + * Return: mgr platform device if successful, and error code otherwise. + */ +static struct platform_device * +dfl_fme_create_mgr(struct dfl_feature_platform_data *pdata, + struct dfl_feature *feature) +{ + struct platform_device *mgr, *fme = pdata->dev; + struct dfl_fme_mgr_pdata mgr_pdata; + int ret = -ENOMEM; + + if (!feature->ioaddr) + return ERR_PTR(-ENODEV); + + mgr_pdata.ioaddr = feature->ioaddr; + + /* + * Each FME has only one fpga-mgr, so allocate platform device using + * the same FME platform device id. + */ + mgr = platform_device_alloc(DFL_FPGA_FME_MGR, fme->id); + if (!mgr) + return ERR_PTR(ret); + + mgr->dev.parent = &fme->dev; + + ret = platform_device_add_data(mgr, &mgr_pdata, sizeof(mgr_pdata)); + if (ret) + goto create_mgr_err; + + ret = platform_device_add(mgr); + if (ret) + goto create_mgr_err; + + return mgr; + +create_mgr_err: + platform_device_put(mgr); + return ERR_PTR(ret); +} + +/** + * dfl_fme_destroy_mgr - destroy fpga mgr platform device + * @pdata: fme platform device's pdata + */ +static void dfl_fme_destroy_mgr(struct dfl_feature_platform_data *pdata) +{ + struct dfl_fme *priv = dfl_fpga_pdata_get_private(pdata); + + platform_device_unregister(priv->mgr); +} + +/** + * dfl_fme_create_bridge - create fme fpga bridge platform device as child + * + * @pdata: fme platform device's pdata + * @port_id: port id for the bridge to be created. + * + * Return: bridge platform device if successful, and error code otherwise. + */ +static struct dfl_fme_bridge * +dfl_fme_create_bridge(struct dfl_feature_platform_data *pdata, int port_id) +{ + struct device *dev = &pdata->dev->dev; + struct dfl_fme_br_pdata br_pdata; + struct dfl_fme_bridge *fme_br; + int ret = -ENOMEM; + + fme_br = devm_kzalloc(dev, sizeof(*fme_br), GFP_KERNEL); + if (!fme_br) + return ERR_PTR(ret); + + br_pdata.cdev = pdata->dfl_cdev; + br_pdata.port_id = port_id; + + fme_br->br = platform_device_alloc(DFL_FPGA_FME_BRIDGE, + PLATFORM_DEVID_AUTO); + if (!fme_br->br) + return ERR_PTR(ret); + + fme_br->br->dev.parent = dev; + + ret = platform_device_add_data(fme_br->br, &br_pdata, sizeof(br_pdata)); + if (ret) + goto create_br_err; + + ret = platform_device_add(fme_br->br); + if (ret) + goto create_br_err; + + return fme_br; + +create_br_err: + platform_device_put(fme_br->br); + return ERR_PTR(ret); +} + +/** + * dfl_fme_destroy_bridge - destroy fpga bridge platform device + * @fme_br: fme bridge to destroy + */ +static void dfl_fme_destroy_bridge(struct dfl_fme_bridge *fme_br) +{ + platform_device_unregister(fme_br->br); +} + +/** + * dfl_fme_destroy_bridge - destroy all fpga bridge platform device + * @pdata: fme platform device's pdata + */ +static void dfl_fme_destroy_bridges(struct dfl_feature_platform_data *pdata) +{ + struct dfl_fme *priv = dfl_fpga_pdata_get_private(pdata); + struct dfl_fme_bridge *fbridge, *tmp; + + list_for_each_entry_safe(fbridge, tmp, &priv->bridge_list, node) { + list_del(&fbridge->node); + dfl_fme_destroy_bridge(fbridge); + } +} + +/** + * dfl_fme_create_region - create fpga region platform device as child + * + * @pdata: fme platform device's pdata + * @mgr: mgr platform device needed for region + * @br: br platform device needed for region + * @port_id: port id + * + * Return: fme region if successful, and error code otherwise. + */ +static struct dfl_fme_region * +dfl_fme_create_region(struct dfl_feature_platform_data *pdata, + struct platform_device *mgr, + struct platform_device *br, int port_id) +{ + struct dfl_fme_region_pdata region_pdata; + struct device *dev = &pdata->dev->dev; + struct dfl_fme_region *fme_region; + int ret = -ENOMEM; + + fme_region = devm_kzalloc(dev, sizeof(*fme_region), GFP_KERNEL); + if (!fme_region) + return ERR_PTR(ret); + + region_pdata.mgr = mgr; + region_pdata.br = br; + + /* + * Each FPGA device may have more than one port, so allocate platform + * device using the same port platform device id. + */ + fme_region->region = platform_device_alloc(DFL_FPGA_FME_REGION, br->id); + if (!fme_region->region) + return ERR_PTR(ret); + + fme_region->region->dev.parent = dev; + + ret = platform_device_add_data(fme_region->region, ®ion_pdata, + sizeof(region_pdata)); + if (ret) + goto create_region_err; + + ret = platform_device_add(fme_region->region); + if (ret) + goto create_region_err; + + fme_region->port_id = port_id; + + return fme_region; + +create_region_err: + platform_device_put(fme_region->region); + return ERR_PTR(ret); +} + +/** + * dfl_fme_destroy_region - destroy fme region + * @fme_region: fme region to destroy + */ +static void dfl_fme_destroy_region(struct dfl_fme_region *fme_region) +{ + platform_device_unregister(fme_region->region); +} + +/** + * dfl_fme_destroy_regions - destroy all fme regions + * @pdata: fme platform device's pdata + */ +static void dfl_fme_destroy_regions(struct dfl_feature_platform_data *pdata) +{ + struct dfl_fme *priv = dfl_fpga_pdata_get_private(pdata); + struct dfl_fme_region *fme_region, *tmp; + + list_for_each_entry_safe(fme_region, tmp, &priv->region_list, node) { + list_del(&fme_region->node); + dfl_fme_destroy_region(fme_region); + } +} + +static int pr_mgmt_init(struct platform_device *pdev, + struct dfl_feature *feature) +{ + struct dfl_feature_platform_data *pdata = dev_get_platdata(&pdev->dev); + struct dfl_fme_region *fme_region; + struct dfl_fme_bridge *fme_br; + struct platform_device *mgr; + struct dfl_fme *priv; + void __iomem *fme_hdr; + int ret = -ENODEV, i = 0; + u64 fme_cap, port_offset; + + fme_hdr = dfl_get_feature_ioaddr_by_id(&pdev->dev, + FME_FEATURE_ID_HEADER); + + mutex_lock(&pdata->lock); + priv = dfl_fpga_pdata_get_private(pdata); + + /* Initialize the region and bridge sub device list */ + INIT_LIST_HEAD(&priv->region_list); + INIT_LIST_HEAD(&priv->bridge_list); + + /* Create fpga mgr platform device */ + mgr = dfl_fme_create_mgr(pdata, feature); + if (IS_ERR(mgr)) { + dev_err(&pdev->dev, "fail to create fpga mgr pdev\n"); + goto unlock; + } + + priv->mgr = mgr; + + /* Read capability register to check number of regions and bridges */ + fme_cap = readq(fme_hdr + FME_HDR_CAP); + for (; i < FIELD_GET(FME_CAP_NUM_PORTS, fme_cap); i++) { + port_offset = readq(fme_hdr + FME_HDR_PORT_OFST(i)); + if (!(port_offset & FME_PORT_OFST_IMP)) + continue; + + /* Create bridge for each port */ + fme_br = dfl_fme_create_bridge(pdata, i); + if (IS_ERR(fme_br)) { + ret = PTR_ERR(fme_br); + goto destroy_region; + } + + list_add(&fme_br->node, &priv->bridge_list); + + /* Create region for each port */ + fme_region = dfl_fme_create_region(pdata, mgr, + fme_br->br, i); + if (IS_ERR(fme_region)) { + ret = PTR_ERR(fme_region); + goto destroy_region; + } + + list_add(&fme_region->node, &priv->region_list); + } + mutex_unlock(&pdata->lock); + + return 0; + +destroy_region: + dfl_fme_destroy_regions(pdata); + dfl_fme_destroy_bridges(pdata); + dfl_fme_destroy_mgr(pdata); +unlock: + mutex_unlock(&pdata->lock); + return ret; +} + +static void pr_mgmt_uinit(struct platform_device *pdev, + struct dfl_feature *feature) +{ + struct dfl_feature_platform_data *pdata = dev_get_platdata(&pdev->dev); + struct dfl_fme *priv; + + mutex_lock(&pdata->lock); + priv = dfl_fpga_pdata_get_private(pdata); + + dfl_fme_destroy_regions(pdata); + dfl_fme_destroy_bridges(pdata); + dfl_fme_destroy_mgr(pdata); + mutex_unlock(&pdata->lock); +} + +static long fme_pr_ioctl(struct platform_device *pdev, + struct dfl_feature *feature, + unsigned int cmd, unsigned long arg) +{ + long ret; + + switch (cmd) { + case DFL_FPGA_FME_PORT_PR: + ret = fme_pr(pdev, arg); + break; + default: + ret = -ENODEV; + } + + return ret; +} + +const struct dfl_feature_ops pr_mgmt_ops = { + .init = pr_mgmt_init, + .uinit = pr_mgmt_uinit, + .ioctl = fme_pr_ioctl, +}; |