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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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fea82b7f66
Add devm_fpga_region_create() which is the managed version of fpga_region_create(). Change current region drivers to use devm_fpga_region_create(). Signed-off-by: Alan Tull <atull@kernel.org> Suggested-by: Federico Vaga <federico.vaga@cern.ch> Acked-by: Moritz Fischer <mdf@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
349 lines
8.5 KiB
C
349 lines
8.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* FPGA Region - Device Tree support for FPGA programming under Linux
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*
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* Copyright (C) 2013-2016 Altera Corporation
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* Copyright (C) 2017 Intel Corporation
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*/
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#include <linux/fpga/fpga-bridge.h>
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#include <linux/fpga/fpga-mgr.h>
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#include <linux/fpga/fpga-region.h>
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#include <linux/idr.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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static DEFINE_IDA(fpga_region_ida);
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static struct class *fpga_region_class;
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struct fpga_region *fpga_region_class_find(
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struct device *start, const void *data,
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int (*match)(struct device *, const void *))
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{
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struct device *dev;
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dev = class_find_device(fpga_region_class, start, data, match);
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if (!dev)
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return NULL;
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return to_fpga_region(dev);
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}
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EXPORT_SYMBOL_GPL(fpga_region_class_find);
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/**
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* fpga_region_get - get an exclusive reference to a fpga region
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* @region: FPGA Region struct
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*
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* Caller should call fpga_region_put() when done with region.
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*
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* Return fpga_region struct if successful.
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* Return -EBUSY if someone already has a reference to the region.
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* Return -ENODEV if @np is not a FPGA Region.
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*/
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static struct fpga_region *fpga_region_get(struct fpga_region *region)
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{
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struct device *dev = ®ion->dev;
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if (!mutex_trylock(®ion->mutex)) {
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dev_dbg(dev, "%s: FPGA Region already in use\n", __func__);
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return ERR_PTR(-EBUSY);
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}
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get_device(dev);
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if (!try_module_get(dev->parent->driver->owner)) {
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put_device(dev);
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mutex_unlock(®ion->mutex);
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return ERR_PTR(-ENODEV);
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}
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dev_dbg(dev, "get\n");
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return region;
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}
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/**
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* fpga_region_put - release a reference to a region
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*
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* @region: FPGA region
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*/
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static void fpga_region_put(struct fpga_region *region)
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{
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struct device *dev = ®ion->dev;
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dev_dbg(dev, "put\n");
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module_put(dev->parent->driver->owner);
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put_device(dev);
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mutex_unlock(®ion->mutex);
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}
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/**
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* fpga_region_program_fpga - program FPGA
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*
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* @region: FPGA region
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*
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* Program an FPGA using fpga image info (region->info).
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* If the region has a get_bridges function, the exclusive reference for the
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* bridges will be held if programming succeeds. This is intended to prevent
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* reprogramming the region until the caller considers it safe to do so.
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* The caller will need to call fpga_bridges_put() before attempting to
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* reprogram the region.
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*
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* Return 0 for success or negative error code.
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*/
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int fpga_region_program_fpga(struct fpga_region *region)
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{
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struct device *dev = ®ion->dev;
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struct fpga_image_info *info = region->info;
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int ret;
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region = fpga_region_get(region);
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if (IS_ERR(region)) {
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dev_err(dev, "failed to get FPGA region\n");
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return PTR_ERR(region);
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}
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ret = fpga_mgr_lock(region->mgr);
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if (ret) {
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dev_err(dev, "FPGA manager is busy\n");
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goto err_put_region;
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}
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/*
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* In some cases, we already have a list of bridges in the
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* fpga region struct. Or we don't have any bridges.
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*/
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if (region->get_bridges) {
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ret = region->get_bridges(region);
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if (ret) {
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dev_err(dev, "failed to get fpga region bridges\n");
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goto err_unlock_mgr;
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}
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}
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ret = fpga_bridges_disable(®ion->bridge_list);
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if (ret) {
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dev_err(dev, "failed to disable bridges\n");
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goto err_put_br;
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}
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ret = fpga_mgr_load(region->mgr, info);
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if (ret) {
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dev_err(dev, "failed to load FPGA image\n");
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goto err_put_br;
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}
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ret = fpga_bridges_enable(®ion->bridge_list);
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if (ret) {
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dev_err(dev, "failed to enable region bridges\n");
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goto err_put_br;
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}
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fpga_mgr_unlock(region->mgr);
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fpga_region_put(region);
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return 0;
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err_put_br:
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if (region->get_bridges)
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fpga_bridges_put(®ion->bridge_list);
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err_unlock_mgr:
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fpga_mgr_unlock(region->mgr);
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err_put_region:
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fpga_region_put(region);
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return ret;
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}
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EXPORT_SYMBOL_GPL(fpga_region_program_fpga);
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static ssize_t compat_id_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct fpga_region *region = to_fpga_region(dev);
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if (!region->compat_id)
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return -ENOENT;
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return sprintf(buf, "%016llx%016llx\n",
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(unsigned long long)region->compat_id->id_h,
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(unsigned long long)region->compat_id->id_l);
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}
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static DEVICE_ATTR_RO(compat_id);
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static struct attribute *fpga_region_attrs[] = {
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&dev_attr_compat_id.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(fpga_region);
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/**
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* fpga_region_create - alloc and init a struct fpga_region
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* @dev: device parent
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* @mgr: manager that programs this region
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* @get_bridges: optional function to get bridges to a list
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*
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* The caller of this function is responsible for freeing the resulting region
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* struct with fpga_region_free(). Using devm_fpga_region_create() instead is
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* recommended.
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*
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* Return: struct fpga_region or NULL
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*/
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struct fpga_region
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*fpga_region_create(struct device *dev,
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struct fpga_manager *mgr,
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int (*get_bridges)(struct fpga_region *))
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{
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struct fpga_region *region;
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int id, ret = 0;
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region = kzalloc(sizeof(*region), GFP_KERNEL);
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if (!region)
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return NULL;
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id = ida_simple_get(&fpga_region_ida, 0, 0, GFP_KERNEL);
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if (id < 0)
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goto err_free;
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region->mgr = mgr;
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region->get_bridges = get_bridges;
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mutex_init(®ion->mutex);
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INIT_LIST_HEAD(®ion->bridge_list);
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device_initialize(®ion->dev);
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region->dev.class = fpga_region_class;
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region->dev.parent = dev;
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region->dev.of_node = dev->of_node;
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region->dev.id = id;
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ret = dev_set_name(®ion->dev, "region%d", id);
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if (ret)
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goto err_remove;
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return region;
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err_remove:
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ida_simple_remove(&fpga_region_ida, id);
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err_free:
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kfree(region);
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return NULL;
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}
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EXPORT_SYMBOL_GPL(fpga_region_create);
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/**
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* fpga_region_free - free a FPGA region created by fpga_region_create()
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* @region: FPGA region
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*/
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void fpga_region_free(struct fpga_region *region)
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{
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ida_simple_remove(&fpga_region_ida, region->dev.id);
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kfree(region);
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}
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EXPORT_SYMBOL_GPL(fpga_region_free);
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static void devm_fpga_region_release(struct device *dev, void *res)
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{
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struct fpga_region *region = *(struct fpga_region **)res;
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fpga_region_free(region);
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}
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/**
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* devm_fpga_region_create - create and initialize a managed FPGA region struct
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* @dev: device parent
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* @mgr: manager that programs this region
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* @get_bridges: optional function to get bridges to a list
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*
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* This function is intended for use in a FPGA region driver's probe function.
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* After the region driver creates the region struct with
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* devm_fpga_region_create(), it should register it with fpga_region_register().
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* The region driver's remove function should call fpga_region_unregister().
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* The region struct allocated with this function will be freed automatically on
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* driver detach. This includes the case of a probe function returning error
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* before calling fpga_region_register(), the struct will still get cleaned up.
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*
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* Return: struct fpga_region or NULL
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*/
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struct fpga_region
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*devm_fpga_region_create(struct device *dev,
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struct fpga_manager *mgr,
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int (*get_bridges)(struct fpga_region *))
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{
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struct fpga_region **ptr, *region;
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ptr = devres_alloc(devm_fpga_region_release, sizeof(*ptr), GFP_KERNEL);
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if (!ptr)
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return NULL;
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region = fpga_region_create(dev, mgr, get_bridges);
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if (!region) {
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devres_free(ptr);
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} else {
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*ptr = region;
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devres_add(dev, ptr);
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}
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return region;
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}
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EXPORT_SYMBOL_GPL(devm_fpga_region_create);
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/**
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* fpga_region_register - register a FPGA region
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* @region: FPGA region
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*
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* Return: 0 or -errno
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*/
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int fpga_region_register(struct fpga_region *region)
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{
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return device_add(®ion->dev);
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}
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EXPORT_SYMBOL_GPL(fpga_region_register);
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/**
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* fpga_region_unregister - unregister a FPGA region
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* @region: FPGA region
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*
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* This function is intended for use in a FPGA region driver's remove function.
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*/
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void fpga_region_unregister(struct fpga_region *region)
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{
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device_unregister(®ion->dev);
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}
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EXPORT_SYMBOL_GPL(fpga_region_unregister);
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static void fpga_region_dev_release(struct device *dev)
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{
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}
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/**
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* fpga_region_init - init function for fpga_region class
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* Creates the fpga_region class and registers a reconfig notifier.
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*/
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static int __init fpga_region_init(void)
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{
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fpga_region_class = class_create(THIS_MODULE, "fpga_region");
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if (IS_ERR(fpga_region_class))
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return PTR_ERR(fpga_region_class);
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fpga_region_class->dev_groups = fpga_region_groups;
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fpga_region_class->dev_release = fpga_region_dev_release;
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return 0;
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}
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static void __exit fpga_region_exit(void)
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{
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class_destroy(fpga_region_class);
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ida_destroy(&fpga_region_ida);
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}
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subsys_initcall(fpga_region_init);
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module_exit(fpga_region_exit);
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MODULE_DESCRIPTION("FPGA Region");
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MODULE_AUTHOR("Alan Tull <atull@kernel.org>");
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MODULE_LICENSE("GPL v2");
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