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dfl.c
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dfl.c
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// SPDX-License-Identifier: GPL-2.0
/*
* Driver for FPGA Device Feature List (DFL) Support
*
* Copyright (C) 2017-2018 Intel Corporation, Inc.
*
* Authors:
* Kang Luwei <luwei.kang@intel.com>
* Zhang Yi <yi.z.zhang@intel.com>
* Wu Hao <hao.wu@intel.com>
* Xiao Guangrong <guangrong.xiao@linux.intel.com>
*/
#include <linux/dfl.h>
#include <linux/fpga-dfl.h>
#include <linux/module.h>
#include <linux/overflow.h>
#include <linux/uaccess.h>
#include "dfl.h"
static DEFINE_MUTEX(dfl_id_mutex);
/*
* when adding a new feature dev support in DFL framework, it's required to
* add a new item in enum dfl_id_type and provide related information in below
* dfl_devs table which is indexed by dfl_id_type, e.g. name string used for
* platform device creation (define name strings in dfl.h, as they could be
* reused by platform device drivers).
*
* if the new feature dev needs chardev support, then it's required to add
* a new item in dfl_chardevs table and configure dfl_devs[i].devt_type as
* index to dfl_chardevs table. If no chardev support just set devt_type
* as one invalid index (DFL_FPGA_DEVT_MAX).
*/
enum dfl_fpga_devt_type {
DFL_FPGA_DEVT_FME,
DFL_FPGA_DEVT_PORT,
DFL_FPGA_DEVT_MAX,
};
static struct lock_class_key dfl_pdata_keys[DFL_ID_MAX];
static const char *dfl_pdata_key_strings[DFL_ID_MAX] = {
"dfl-fme-pdata",
"dfl-port-pdata",
};
/**
* struct dfl_dev_info - dfl feature device information.
* @name: name string of the feature platform device.
* @dfh_id: id value in Device Feature Header (DFH) register by DFL spec.
* @id: idr id of the feature dev.
* @devt_type: index to dfl_chrdevs[].
*/
struct dfl_dev_info {
const char *name;
u16 dfh_id;
struct idr id;
enum dfl_fpga_devt_type devt_type;
};
/* it is indexed by dfl_id_type */
static struct dfl_dev_info dfl_devs[] = {
{.name = DFL_FPGA_FEATURE_DEV_FME, .dfh_id = DFH_ID_FIU_FME,
.devt_type = DFL_FPGA_DEVT_FME},
{.name = DFL_FPGA_FEATURE_DEV_PORT, .dfh_id = DFH_ID_FIU_PORT,
.devt_type = DFL_FPGA_DEVT_PORT},
};
/**
* struct dfl_chardev_info - chardev information of dfl feature device
* @name: nmae string of the char device.
* @devt: devt of the char device.
*/
struct dfl_chardev_info {
const char *name;
dev_t devt;
};
/* indexed by enum dfl_fpga_devt_type */
static struct dfl_chardev_info dfl_chrdevs[] = {
{.name = DFL_FPGA_FEATURE_DEV_FME},
{.name = DFL_FPGA_FEATURE_DEV_PORT},
};
static void dfl_ids_init(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(dfl_devs); i++)
idr_init(&dfl_devs[i].id);
}
static void dfl_ids_destroy(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(dfl_devs); i++)
idr_destroy(&dfl_devs[i].id);
}
static int dfl_id_alloc(enum dfl_id_type type, struct device *dev)
{
int id;
WARN_ON(type >= DFL_ID_MAX);
mutex_lock(&dfl_id_mutex);
id = idr_alloc(&dfl_devs[type].id, dev, 0, 0, GFP_KERNEL);
mutex_unlock(&dfl_id_mutex);
return id;
}
static void dfl_id_free(enum dfl_id_type type, int id)
{
WARN_ON(type >= DFL_ID_MAX);
mutex_lock(&dfl_id_mutex);
idr_remove(&dfl_devs[type].id, id);
mutex_unlock(&dfl_id_mutex);
}
static enum dfl_id_type feature_dev_id_type(struct platform_device *pdev)
{
int i;
for (i = 0; i < ARRAY_SIZE(dfl_devs); i++)
if (!strcmp(dfl_devs[i].name, pdev->name))
return i;
return DFL_ID_MAX;
}
static enum dfl_id_type dfh_id_to_type(u16 id)
{
int i;
for (i = 0; i < ARRAY_SIZE(dfl_devs); i++)
if (dfl_devs[i].dfh_id == id)
return i;
return DFL_ID_MAX;
}
/*
* introduce a global port_ops list, it allows port drivers to register ops
* in such list, then other feature devices (e.g. FME), could use the port
* functions even related port platform device is hidden. Below is one example,
* in virtualization case of PCIe-based FPGA DFL device, when SRIOV is
* enabled, port (and it's AFU) is turned into VF and port platform device
* is hidden from system but it's still required to access port to finish FPGA
* reconfiguration function in FME.
*/
static DEFINE_MUTEX(dfl_port_ops_mutex);
static LIST_HEAD(dfl_port_ops_list);
/**
* dfl_fpga_port_ops_get - get matched port ops from the global list
* @pdev: platform device to match with associated port ops.
* Return: matched port ops on success, NULL otherwise.
*
* Please note that must dfl_fpga_port_ops_put after use the port_ops.
*/
struct dfl_fpga_port_ops *dfl_fpga_port_ops_get(struct platform_device *pdev)
{
struct dfl_fpga_port_ops *ops = NULL;
mutex_lock(&dfl_port_ops_mutex);
if (list_empty(&dfl_port_ops_list))
goto done;
list_for_each_entry(ops, &dfl_port_ops_list, node) {
/* match port_ops using the name of platform device */
if (!strcmp(pdev->name, ops->name)) {
if (!try_module_get(ops->owner))
ops = NULL;
goto done;
}
}
ops = NULL;
done:
mutex_unlock(&dfl_port_ops_mutex);
return ops;
}
EXPORT_SYMBOL_GPL(dfl_fpga_port_ops_get);
/**
* dfl_fpga_port_ops_put - put port ops
* @ops: port ops.
*/
void dfl_fpga_port_ops_put(struct dfl_fpga_port_ops *ops)
{
if (ops && ops->owner)
module_put(ops->owner);
}
EXPORT_SYMBOL_GPL(dfl_fpga_port_ops_put);
/**
* dfl_fpga_port_ops_add - add port_ops to global list
* @ops: port ops to add.
*/
void dfl_fpga_port_ops_add(struct dfl_fpga_port_ops *ops)
{
mutex_lock(&dfl_port_ops_mutex);
list_add_tail(&ops->node, &dfl_port_ops_list);
mutex_unlock(&dfl_port_ops_mutex);
}
EXPORT_SYMBOL_GPL(dfl_fpga_port_ops_add);
/**
* dfl_fpga_port_ops_del - remove port_ops from global list
* @ops: port ops to del.
*/
void dfl_fpga_port_ops_del(struct dfl_fpga_port_ops *ops)
{
mutex_lock(&dfl_port_ops_mutex);
list_del(&ops->node);
mutex_unlock(&dfl_port_ops_mutex);
}
EXPORT_SYMBOL_GPL(dfl_fpga_port_ops_del);
/**
* dfl_fpga_check_port_id - check the port id
* @pdev: port platform device.
* @pport_id: port id to compare.
*
* Return: 1 if port device matches with given port id, otherwise 0.
*/
int dfl_fpga_check_port_id(struct platform_device *pdev, void *pport_id)
{
struct dfl_feature_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct dfl_fpga_port_ops *port_ops;
if (pdata->id != FEATURE_DEV_ID_UNUSED)
return pdata->id == *(int *)pport_id;
port_ops = dfl_fpga_port_ops_get(pdev);
if (!port_ops || !port_ops->get_id)
return 0;
pdata->id = port_ops->get_id(pdev);
dfl_fpga_port_ops_put(port_ops);
return pdata->id == *(int *)pport_id;
}
EXPORT_SYMBOL_GPL(dfl_fpga_check_port_id);
static DEFINE_IDA(dfl_device_ida);
static const struct dfl_device_id *
dfl_match_one_device(const struct dfl_device_id *id, struct dfl_device *ddev)
{
if (id->type == ddev->type && id->feature_id == ddev->feature_id)
return id;
return NULL;
}
static int dfl_bus_match(struct device *dev, struct device_driver *drv)
{
struct dfl_device *ddev = to_dfl_dev(dev);
struct dfl_driver *ddrv = to_dfl_drv(drv);
const struct dfl_device_id *id_entry;
id_entry = ddrv->id_table;
if (id_entry) {
while (id_entry->feature_id) {
if (dfl_match_one_device(id_entry, ddev)) {
ddev->id_entry = id_entry;
return 1;
}
id_entry++;
}
}
return 0;
}
static int dfl_bus_probe(struct device *dev)
{
struct dfl_driver *ddrv = to_dfl_drv(dev->driver);
struct dfl_device *ddev = to_dfl_dev(dev);
return ddrv->probe(ddev);
}
static void dfl_bus_remove(struct device *dev)
{
struct dfl_driver *ddrv = to_dfl_drv(dev->driver);
struct dfl_device *ddev = to_dfl_dev(dev);
if (ddrv->remove)
ddrv->remove(ddev);
}
static int dfl_bus_uevent(const struct device *dev, struct kobj_uevent_env *env)
{
const struct dfl_device *ddev = to_dfl_dev(dev);
return add_uevent_var(env, "MODALIAS=dfl:t%04Xf%04X",
ddev->type, ddev->feature_id);
}
static ssize_t
type_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct dfl_device *ddev = to_dfl_dev(dev);
return sprintf(buf, "0x%x\n", ddev->type);
}
static DEVICE_ATTR_RO(type);
static ssize_t
feature_id_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct dfl_device *ddev = to_dfl_dev(dev);
return sprintf(buf, "0x%x\n", ddev->feature_id);
}
static DEVICE_ATTR_RO(feature_id);
static struct attribute *dfl_dev_attrs[] = {
&dev_attr_type.attr,
&dev_attr_feature_id.attr,
NULL,
};
ATTRIBUTE_GROUPS(dfl_dev);
static struct bus_type dfl_bus_type = {
.name = "dfl",
.match = dfl_bus_match,
.probe = dfl_bus_probe,
.remove = dfl_bus_remove,
.uevent = dfl_bus_uevent,
.dev_groups = dfl_dev_groups,
};
static void release_dfl_dev(struct device *dev)
{
struct dfl_device *ddev = to_dfl_dev(dev);
if (ddev->mmio_res.parent)
release_resource(&ddev->mmio_res);
kfree(ddev->params);
ida_free(&dfl_device_ida, ddev->id);
kfree(ddev->irqs);
kfree(ddev);
}
static struct dfl_device *
dfl_dev_add(struct dfl_feature_platform_data *pdata,
struct dfl_feature *feature)
{
struct platform_device *pdev = pdata->dev;
struct resource *parent_res;
struct dfl_device *ddev;
int id, i, ret;
ddev = kzalloc(sizeof(*ddev), GFP_KERNEL);
if (!ddev)
return ERR_PTR(-ENOMEM);
id = ida_alloc(&dfl_device_ida, GFP_KERNEL);
if (id < 0) {
dev_err(&pdev->dev, "unable to get id\n");
kfree(ddev);
return ERR_PTR(id);
}
/* freeing resources by put_device() after device_initialize() */
device_initialize(&ddev->dev);
ddev->dev.parent = &pdev->dev;
ddev->dev.bus = &dfl_bus_type;
ddev->dev.release = release_dfl_dev;
ddev->id = id;
ret = dev_set_name(&ddev->dev, "dfl_dev.%d", id);
if (ret)
goto put_dev;
ddev->type = feature_dev_id_type(pdev);
ddev->feature_id = feature->id;
ddev->revision = feature->revision;
ddev->dfh_version = feature->dfh_version;
ddev->cdev = pdata->dfl_cdev;
if (feature->param_size) {
ddev->params = kmemdup(feature->params, feature->param_size, GFP_KERNEL);
if (!ddev->params) {
ret = -ENOMEM;
goto put_dev;
}
ddev->param_size = feature->param_size;
}
/* add mmio resource */
parent_res = &pdev->resource[feature->resource_index];
ddev->mmio_res.flags = IORESOURCE_MEM;
ddev->mmio_res.start = parent_res->start;
ddev->mmio_res.end = parent_res->end;
ddev->mmio_res.name = dev_name(&ddev->dev);
ret = insert_resource(parent_res, &ddev->mmio_res);
if (ret) {
dev_err(&pdev->dev, "%s failed to claim resource: %pR\n",
dev_name(&ddev->dev), &ddev->mmio_res);
goto put_dev;
}
/* then add irq resource */
if (feature->nr_irqs) {
ddev->irqs = kcalloc(feature->nr_irqs,
sizeof(*ddev->irqs), GFP_KERNEL);
if (!ddev->irqs) {
ret = -ENOMEM;
goto put_dev;
}
for (i = 0; i < feature->nr_irqs; i++)
ddev->irqs[i] = feature->irq_ctx[i].irq;
ddev->num_irqs = feature->nr_irqs;
}
ret = device_add(&ddev->dev);
if (ret)
goto put_dev;
dev_dbg(&pdev->dev, "add dfl_dev: %s\n", dev_name(&ddev->dev));
return ddev;
put_dev:
/* calls release_dfl_dev() which does the clean up */
put_device(&ddev->dev);
return ERR_PTR(ret);
}
static void dfl_devs_remove(struct dfl_feature_platform_data *pdata)
{
struct dfl_feature *feature;
dfl_fpga_dev_for_each_feature(pdata, feature) {
if (feature->ddev) {
device_unregister(&feature->ddev->dev);
feature->ddev = NULL;
}
}
}
static int dfl_devs_add(struct dfl_feature_platform_data *pdata)
{
struct dfl_feature *feature;
struct dfl_device *ddev;
int ret;
dfl_fpga_dev_for_each_feature(pdata, feature) {
if (feature->ioaddr)
continue;
if (feature->ddev) {
ret = -EEXIST;
goto err;
}
ddev = dfl_dev_add(pdata, feature);
if (IS_ERR(ddev)) {
ret = PTR_ERR(ddev);
goto err;
}
feature->ddev = ddev;
}
return 0;
err:
dfl_devs_remove(pdata);
return ret;
}
int __dfl_driver_register(struct dfl_driver *dfl_drv, struct module *owner)
{
if (!dfl_drv || !dfl_drv->probe || !dfl_drv->id_table)
return -EINVAL;
dfl_drv->drv.owner = owner;
dfl_drv->drv.bus = &dfl_bus_type;
return driver_register(&dfl_drv->drv);
}
EXPORT_SYMBOL(__dfl_driver_register);
void dfl_driver_unregister(struct dfl_driver *dfl_drv)
{
driver_unregister(&dfl_drv->drv);
}
EXPORT_SYMBOL(dfl_driver_unregister);
#define is_header_feature(feature) ((feature)->id == FEATURE_ID_FIU_HEADER)
/**
* dfl_fpga_dev_feature_uinit - uinit for sub features of dfl feature device
* @pdev: feature device.
*/
void dfl_fpga_dev_feature_uinit(struct platform_device *pdev)
{
struct dfl_feature_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct dfl_feature *feature;
dfl_devs_remove(pdata);
dfl_fpga_dev_for_each_feature(pdata, feature) {
if (feature->ops) {
if (feature->ops->uinit)
feature->ops->uinit(pdev, feature);
feature->ops = NULL;
}
}
}
EXPORT_SYMBOL_GPL(dfl_fpga_dev_feature_uinit);
static int dfl_feature_instance_init(struct platform_device *pdev,
struct dfl_feature_platform_data *pdata,
struct dfl_feature *feature,
struct dfl_feature_driver *drv)
{
void __iomem *base;
int ret = 0;
if (!is_header_feature(feature)) {
base = devm_platform_ioremap_resource(pdev,
feature->resource_index);
if (IS_ERR(base)) {
dev_err(&pdev->dev,
"ioremap failed for feature 0x%x!\n",
feature->id);
return PTR_ERR(base);
}
feature->ioaddr = base;
}
if (drv->ops->init) {
ret = drv->ops->init(pdev, feature);
if (ret)
return ret;
}
feature->ops = drv->ops;
return ret;
}
static bool dfl_feature_drv_match(struct dfl_feature *feature,
struct dfl_feature_driver *driver)
{
const struct dfl_feature_id *ids = driver->id_table;
if (ids) {
while (ids->id) {
if (ids->id == feature->id)
return true;
ids++;
}
}
return false;
}
/**
* dfl_fpga_dev_feature_init - init for sub features of dfl feature device
* @pdev: feature device.
* @feature_drvs: drvs for sub features.
*
* This function will match sub features with given feature drvs list and
* use matched drv to init related sub feature.
*
* Return: 0 on success, negative error code otherwise.
*/
int dfl_fpga_dev_feature_init(struct platform_device *pdev,
struct dfl_feature_driver *feature_drvs)
{
struct dfl_feature_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct dfl_feature_driver *drv = feature_drvs;
struct dfl_feature *feature;
int ret;
while (drv->ops) {
dfl_fpga_dev_for_each_feature(pdata, feature) {
if (dfl_feature_drv_match(feature, drv)) {
ret = dfl_feature_instance_init(pdev, pdata,
feature, drv);
if (ret)
goto exit;
}
}
drv++;
}
ret = dfl_devs_add(pdata);
if (ret)
goto exit;
return 0;
exit:
dfl_fpga_dev_feature_uinit(pdev);
return ret;
}
EXPORT_SYMBOL_GPL(dfl_fpga_dev_feature_init);
static void dfl_chardev_uinit(void)
{
int i;
for (i = 0; i < DFL_FPGA_DEVT_MAX; i++)
if (MAJOR(dfl_chrdevs[i].devt)) {
unregister_chrdev_region(dfl_chrdevs[i].devt,
MINORMASK + 1);
dfl_chrdevs[i].devt = MKDEV(0, 0);
}
}
static int dfl_chardev_init(void)
{
int i, ret;
for (i = 0; i < DFL_FPGA_DEVT_MAX; i++) {
ret = alloc_chrdev_region(&dfl_chrdevs[i].devt, 0,
MINORMASK + 1, dfl_chrdevs[i].name);
if (ret)
goto exit;
}
return 0;
exit:
dfl_chardev_uinit();
return ret;
}
static dev_t dfl_get_devt(enum dfl_fpga_devt_type type, int id)
{
if (type >= DFL_FPGA_DEVT_MAX)
return 0;
return MKDEV(MAJOR(dfl_chrdevs[type].devt), id);
}
/**
* dfl_fpga_dev_ops_register - register cdev ops for feature dev
*
* @pdev: feature dev.
* @fops: file operations for feature dev's cdev.
* @owner: owning module/driver.
*
* Return: 0 on success, negative error code otherwise.
*/
int dfl_fpga_dev_ops_register(struct platform_device *pdev,
const struct file_operations *fops,
struct module *owner)
{
struct dfl_feature_platform_data *pdata = dev_get_platdata(&pdev->dev);
cdev_init(&pdata->cdev, fops);
pdata->cdev.owner = owner;
/*
* set parent to the feature device so that its refcount is
* decreased after the last refcount of cdev is gone, that
* makes sure the feature device is valid during device
* file's life-cycle.
*/
pdata->cdev.kobj.parent = &pdev->dev.kobj;
return cdev_add(&pdata->cdev, pdev->dev.devt, 1);
}
EXPORT_SYMBOL_GPL(dfl_fpga_dev_ops_register);
/**
* dfl_fpga_dev_ops_unregister - unregister cdev ops for feature dev
* @pdev: feature dev.
*/
void dfl_fpga_dev_ops_unregister(struct platform_device *pdev)
{
struct dfl_feature_platform_data *pdata = dev_get_platdata(&pdev->dev);
cdev_del(&pdata->cdev);
}
EXPORT_SYMBOL_GPL(dfl_fpga_dev_ops_unregister);
/**
* struct build_feature_devs_info - info collected during feature dev build.
*
* @dev: device to enumerate.
* @cdev: the container device for all feature devices.
* @nr_irqs: number of irqs for all feature devices.
* @irq_table: Linux IRQ numbers for all irqs, indexed by local irq index of
* this device.
* @feature_dev: current feature device.
* @ioaddr: header register region address of current FIU in enumeration.
* @start: register resource start of current FIU.
* @len: max register resource length of current FIU.
* @sub_features: a sub features linked list for feature device in enumeration.
* @feature_num: number of sub features for feature device in enumeration.
*/
struct build_feature_devs_info {
struct device *dev;
struct dfl_fpga_cdev *cdev;
unsigned int nr_irqs;
int *irq_table;
struct platform_device *feature_dev;
void __iomem *ioaddr;
resource_size_t start;
resource_size_t len;
struct list_head sub_features;
int feature_num;
};
/**
* struct dfl_feature_info - sub feature info collected during feature dev build
*
* @fid: id of this sub feature.
* @revision: revision of this sub feature
* @dfh_version: version of Device Feature Header (DFH)
* @mmio_res: mmio resource of this sub feature.
* @ioaddr: mapped base address of mmio resource.
* @node: node in sub_features linked list.
* @irq_base: start of irq index in this sub feature.
* @nr_irqs: number of irqs of this sub feature.
* @param_size: size DFH parameters.
* @params: DFH parameter data.
*/
struct dfl_feature_info {
u16 fid;
u8 revision;
u8 dfh_version;
struct resource mmio_res;
void __iomem *ioaddr;
struct list_head node;
unsigned int irq_base;
unsigned int nr_irqs;
unsigned int param_size;
u64 params[];
};
static void dfl_fpga_cdev_add_port_dev(struct dfl_fpga_cdev *cdev,
struct platform_device *port)
{
struct dfl_feature_platform_data *pdata = dev_get_platdata(&port->dev);
mutex_lock(&cdev->lock);
list_add(&pdata->node, &cdev->port_dev_list);
get_device(&pdata->dev->dev);
mutex_unlock(&cdev->lock);
}
/*
* register current feature device, it is called when we need to switch to
* another feature parsing or we have parsed all features on given device
* feature list.
*/
static int build_info_commit_dev(struct build_feature_devs_info *binfo)
{
struct platform_device *fdev = binfo->feature_dev;
struct dfl_feature_platform_data *pdata;
struct dfl_feature_info *finfo, *p;
enum dfl_id_type type;
int ret, index = 0, res_idx = 0;
type = feature_dev_id_type(fdev);
if (WARN_ON_ONCE(type >= DFL_ID_MAX))
return -EINVAL;
/*
* we do not need to care for the memory which is associated with
* the platform device. After calling platform_device_unregister(),
* it will be automatically freed by device's release() callback,
* platform_device_release().
*/
pdata = kzalloc(struct_size(pdata, features, binfo->feature_num), GFP_KERNEL);
if (!pdata)
return -ENOMEM;
pdata->dev = fdev;
pdata->num = binfo->feature_num;
pdata->dfl_cdev = binfo->cdev;
pdata->id = FEATURE_DEV_ID_UNUSED;
mutex_init(&pdata->lock);
lockdep_set_class_and_name(&pdata->lock, &dfl_pdata_keys[type],
dfl_pdata_key_strings[type]);
/*
* the count should be initialized to 0 to make sure
*__fpga_port_enable() following __fpga_port_disable()
* works properly for port device.
* and it should always be 0 for fme device.
*/
WARN_ON(pdata->disable_count);
fdev->dev.platform_data = pdata;
/* each sub feature has one MMIO resource */
fdev->num_resources = binfo->feature_num;
fdev->resource = kcalloc(binfo->feature_num, sizeof(*fdev->resource),
GFP_KERNEL);
if (!fdev->resource)
return -ENOMEM;
/* fill features and resource information for feature dev */
list_for_each_entry_safe(finfo, p, &binfo->sub_features, node) {
struct dfl_feature *feature = &pdata->features[index++];
struct dfl_feature_irq_ctx *ctx;
unsigned int i;
/* save resource information for each feature */
feature->dev = fdev;
feature->id = finfo->fid;
feature->revision = finfo->revision;
feature->dfh_version = finfo->dfh_version;
if (finfo->param_size) {
feature->params = devm_kmemdup(binfo->dev,
finfo->params, finfo->param_size,
GFP_KERNEL);
if (!feature->params)
return -ENOMEM;
feature->param_size = finfo->param_size;
}
/*
* the FIU header feature has some fundamental functions (sriov
* set, port enable/disable) needed for the dfl bus device and
* other sub features. So its mmio resource should be mapped by
* DFL bus device. And we should not assign it to feature
* devices (dfl-fme/afu) again.
*/
if (is_header_feature(feature)) {
feature->resource_index = -1;
feature->ioaddr =
devm_ioremap_resource(binfo->dev,
&finfo->mmio_res);
if (IS_ERR(feature->ioaddr))
return PTR_ERR(feature->ioaddr);
} else {
feature->resource_index = res_idx;
fdev->resource[res_idx++] = finfo->mmio_res;
}
if (finfo->nr_irqs) {
ctx = devm_kcalloc(binfo->dev, finfo->nr_irqs,
sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
for (i = 0; i < finfo->nr_irqs; i++)
ctx[i].irq =
binfo->irq_table[finfo->irq_base + i];
feature->irq_ctx = ctx;
feature->nr_irqs = finfo->nr_irqs;
}
list_del(&finfo->node);
kfree(finfo);
}
ret = platform_device_add(binfo->feature_dev);
if (!ret) {
if (type == PORT_ID)
dfl_fpga_cdev_add_port_dev(binfo->cdev,
binfo->feature_dev);
else
binfo->cdev->fme_dev =
get_device(&binfo->feature_dev->dev);
/*
* reset it to avoid build_info_free() freeing their resource.
*
* The resource of successfully registered feature devices
* will be freed by platform_device_unregister(). See the
* comments in build_info_create_dev().
*/
binfo->feature_dev = NULL;
}
return ret;
}
static int
build_info_create_dev(struct build_feature_devs_info *binfo,
enum dfl_id_type type)
{
struct platform_device *fdev;
if (type >= DFL_ID_MAX)
return -EINVAL;
/*
* we use -ENODEV as the initialization indicator which indicates
* whether the id need to be reclaimed
*/
fdev = platform_device_alloc(dfl_devs[type].name, -ENODEV);
if (!fdev)
return -ENOMEM;
binfo->feature_dev = fdev;
binfo->feature_num = 0;
INIT_LIST_HEAD(&binfo->sub_features);
fdev->id = dfl_id_alloc(type, &fdev->dev);
if (fdev->id < 0)
return fdev->id;
fdev->dev.parent = &binfo->cdev->region->dev;
fdev->dev.devt = dfl_get_devt(dfl_devs[type].devt_type, fdev->id);
return 0;
}
static void build_info_free(struct build_feature_devs_info *binfo)
{
struct dfl_feature_info *finfo, *p;
/*
* it is a valid id, free it. See comments in
* build_info_create_dev()
*/
if (binfo->feature_dev && binfo->feature_dev->id >= 0) {
dfl_id_free(feature_dev_id_type(binfo->feature_dev),
binfo->feature_dev->id);
list_for_each_entry_safe(finfo, p, &binfo->sub_features, node) {
list_del(&finfo->node);
kfree(finfo);
}
}
platform_device_put(binfo->feature_dev);
devm_kfree(binfo->dev, binfo);
}
static inline u32 feature_size(u64 value)
{
u32 ofst = FIELD_GET(DFH_NEXT_HDR_OFST, value);
/* workaround for private features with invalid size, use 4K instead */
return ofst ? ofst : 4096;
}
static u16 feature_id(u64 value)
{
u16 id = FIELD_GET(DFH_ID, value);
u8 type = FIELD_GET(DFH_TYPE, value);
if (type == DFH_TYPE_FIU)
return FEATURE_ID_FIU_HEADER;
else if (type == DFH_TYPE_PRIVATE)
return id;
else if (type == DFH_TYPE_AFU)
return FEATURE_ID_AFU;
WARN_ON(1);
return 0;
}
static u64 *find_param(u64 *params, resource_size_t max, int param_id)
{
u64 *end = params + max / sizeof(u64);
u64 v, next;
while (params < end) {
v = *params;
if (param_id == FIELD_GET(DFHv1_PARAM_HDR_ID, v))
return params;
if (FIELD_GET(DFHv1_PARAM_HDR_NEXT_EOP, v))
break;
next = FIELD_GET(DFHv1_PARAM_HDR_NEXT_OFFSET, v);
params += next;
}
return NULL;
}
/**
* dfh_find_param() - find parameter block for the given parameter id
* @dfl_dev: dfl device
* @param_id: id of dfl parameter
* @psize: destination to store size of parameter data in bytes
*
* Return: pointer to start of parameter data, PTR_ERR otherwise.
*/
void *dfh_find_param(struct dfl_device *dfl_dev, int param_id, size_t *psize)
{
u64 *phdr = find_param(dfl_dev->params, dfl_dev->param_size, param_id);
if (!phdr)
return ERR_PTR(-ENOENT);