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[75.142.250.213]) by smtp.gmail.com with ESMTPSA id x5sm13123296qtp.76.2020.08.01.08.47.35 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 01 Aug 2020 08:47:36 -0700 (PDT) Subject: Re: [PATCH v2 3/4] fpga: dfl: create a dfl bus type to support DFL devices To: Xu Yilun , mdf@kernel.org, linux-fpga@vger.kernel.org, linux-kernel@vger.kernel.org Cc: lgoncalv@redhat.com, Wu Hao , Matthew Gerlach , Russ Weight References: <1595556555-9903-1-git-send-email-yilun.xu@intel.com> <1595556555-9903-4-git-send-email-yilun.xu@intel.com> From: Tom Rix Message-ID: Date: Sat, 1 Aug 2020 08:47:35 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.6.0 MIME-Version: 1.0 In-Reply-To: <1595556555-9903-4-git-send-email-yilun.xu@intel.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Content-Language: en-US Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patchset is fine. Please add. Reviewed-by: Tom Rix Thanks Tom On 7/23/20 7:09 PM, Xu Yilun wrote: > A new bus type "dfl" is introduced for private features which are not > initialized by DFL feature drivers (dfl-fme & dfl-afu drivers). So these > private features could be handled by separate driver modules. > > DFL feature drivers (dfl-fme, dfl-port) will create DFL devices on > enumeration. DFL drivers could be registered on this bus to match these > DFL devices. They are matched by dfl type & feature_id. > > Signed-off-by: Xu Yilun > Signed-off-by: Wu Hao > Signed-off-by: Matthew Gerlach > Signed-off-by: Russ Weight > ---- > v2: change the bus uevent format. > change the dfl device's sysfs name format. > refactor dfl_dev_add(). > minor fixes for comments from Hao and Tom. > --- > Documentation/ABI/testing/sysfs-bus-dfl | 15 ++ > drivers/fpga/dfl.c | 254 +++++++++++++++++++++++++++++++- > drivers/fpga/dfl.h | 84 +++++++++++ > 3 files changed, 345 insertions(+), 8 deletions(-) > create mode 100644 Documentation/ABI/testing/sysfs-bus-dfl > > diff --git a/Documentation/ABI/testing/sysfs-bus-dfl b/Documentation/ABI/testing/sysfs-bus-dfl > new file mode 100644 > index 0000000..b1eea30 > --- /dev/null > +++ b/Documentation/ABI/testing/sysfs-bus-dfl > @@ -0,0 +1,15 @@ > +What: /sys/bus/dfl/devices/.../type > +Date: July 2020 > +KernelVersion: 5.9 > +Contact: Xu Yilun > +Description: Read-only. It returns type of DFL FIU of the device. Now DFL > + supports 2 FIU types, 0 for FME, 1 for PORT. > + Format: 0x%x > + > +What: /sys/bus/dfl/devices/.../feature_id > +Date: July 2020 > +KernelVersion: 5.9 > +Contact: Xu Yilun > +Description: Read-only. It returns feature identifier local to its DFL FIU > + type. > + Format: 0x%x > diff --git a/drivers/fpga/dfl.c b/drivers/fpga/dfl.c > index b675957..c437053 100644 > --- a/drivers/fpga/dfl.c > +++ b/drivers/fpga/dfl.c > @@ -30,12 +30,6 @@ static DEFINE_MUTEX(dfl_id_mutex); > * index to dfl_chardevs table. If no chardev support just set devt_type > * as one invalid index (DFL_FPGA_DEVT_MAX). > */ > -enum dfl_id_type { > - FME_ID, /* fme id allocation and mapping */ > - PORT_ID, /* port id allocation and mapping */ > - DFL_ID_MAX, > -}; > - > enum dfl_fpga_devt_type { > DFL_FPGA_DEVT_FME, > DFL_FPGA_DEVT_PORT, > @@ -250,6 +244,236 @@ int dfl_fpga_check_port_id(struct platform_device *pdev, void *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 = 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_device *ddev = to_dfl_dev(dev); > + struct dfl_driver *ddrv = to_dfl_drv(dev->driver); > + > + return ddrv->probe(ddev); > +} > + > +static int dfl_bus_remove(struct device *dev) > +{ > + struct dfl_device *ddev = to_dfl_dev(dev); > + struct dfl_driver *ddrv = to_dfl_drv(dev->driver); > + > + if (ddrv->remove) > + ddrv->remove(ddev); > + > + return 0; > +} > + > +static int dfl_bus_uevent(struct device *dev, struct kobj_uevent_env *env) > +{ > + struct dfl_device *ddev = to_dfl_dev(dev); > + > + return add_uevent_var(env, "MODALIAS=dfl:t%08Xf%04X", > + ddev->type, ddev->feature_id); > +} > + > +/* show dfl info fields */ > +#define dfl_info_attr(field, format_string) \ > +static ssize_t \ > +field##_show(struct device *dev, struct device_attribute *attr, \ > + char *buf) \ > +{ \ > + struct dfl_device *ddev = to_dfl_dev(dev); \ > + \ > + return sprintf(buf, format_string, ddev->field); \ > +} \ > +static DEVICE_ATTR_RO(field) > + > +dfl_info_attr(type, "0x%x\n"); > +dfl_info_attr(feature_id, "0x%x\n"); > + > +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); > + > + ida_simple_remove(&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_simple_get(&dfl_device_ida, 0, 0, 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->cdev = pdata->dfl_cdev; > + > + /* 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_info(&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_uinit(struct dfl_feature_platform_data *pdata) > +{ > + struct dfl_device *ddev; > + struct dfl_feature *feature; > + > + dfl_fpga_dev_for_each_feature(pdata, feature) { > + if (!feature->ioaddr && feature->priv) { > + ddev = feature->priv; > + device_unregister(&ddev->dev); > + feature->priv = NULL; > + } > + } > +} > + > +static int dfl_devs_init(struct platform_device *pdev) > +{ > + struct dfl_feature_platform_data *pdata = dev_get_platdata(&pdev->dev); > + struct dfl_feature *feature; > + struct dfl_device *ddev; > + > + dfl_fpga_dev_for_each_feature(pdata, feature) { > + if (feature->ioaddr || feature->priv) > + continue; > + > + ddev = dfl_dev_add(pdata, feature); > + if (IS_ERR(ddev)) { > + dfl_devs_uinit(pdata); > + return PTR_ERR(ddev); > + } > + > + feature->priv = ddev; > + } > + > + return 0; > +} > + > +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) > > /** > @@ -261,12 +485,15 @@ 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_fpga_dev_for_each_feature(pdata, feature) > + dfl_devs_uinit(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); > > @@ -347,6 +574,10 @@ int dfl_fpga_dev_feature_init(struct platform_device *pdev, > drv++; > } > > + ret = dfl_devs_init(pdev); > + if (ret) > + goto exit; > + > return 0; > exit: > dfl_fpga_dev_feature_uinit(pdev); > @@ -1285,11 +1516,17 @@ static int __init dfl_fpga_init(void) > { > int ret; > > + ret = bus_register(&dfl_bus_type); > + if (ret) > + return ret; > + > dfl_ids_init(); > > ret = dfl_chardev_init(); > - if (ret) > + if (ret) { > dfl_ids_destroy(); > + bus_unregister(&dfl_bus_type); > + } > > return ret; > } > @@ -1627,6 +1864,7 @@ static void __exit dfl_fpga_exit(void) > { > dfl_chardev_uinit(); > dfl_ids_destroy(); > + bus_unregister(&dfl_bus_type); > } > > module_init(dfl_fpga_init); > diff --git a/drivers/fpga/dfl.h b/drivers/fpga/dfl.h > index 704efec..7b196867 100644 > --- a/drivers/fpga/dfl.h > +++ b/drivers/fpga/dfl.h > @@ -520,4 +520,88 @@ long dfl_feature_ioctl_set_irq(struct platform_device *pdev, > struct dfl_feature *feature, > unsigned long arg); > > +/** > + * enum dfl_id_type - define the DFL FIU types > + */ > +enum dfl_id_type { > + FME_ID, > + PORT_ID, > + DFL_ID_MAX, > +}; > + > +/** > + * struct dfl_device_id - dfl device identifier > + * @type: Type of DFL FIU of the device. See enum dfl_id_type. > + * @feature_id: 16 bits feature identifier local to its DFL FIU type. > + * @driver_data: Driver specific data > + */ > +struct dfl_device_id { > + unsigned int type; > + u16 feature_id; > + unsigned long driver_data; > +}; > + > +/** > + * struct dfl_device - represent an dfl device on dfl bus > + * > + * @dev: Generic device interface. > + * @id: id of the dfl device > + * @type: Type of DFL FIU of the device. See enum dfl_id_type. > + * @feature_id: 16 bits feature identifier local to its DFL FIU type. > + * @mmio_res: MMIO resource of this dfl device. > + * @irqs: List of Linux IRQ numbers of this dfl device. > + * @num_irqs: number of IRQs supported by this dfl device. > + * @cdev: pointer to DFL FPGA container device this dfl device belongs to. > + * @id_entry: matched id entry in dfl driver's id table. > + */ > +struct dfl_device { > + struct device dev; > + int id; > + unsigned int type; > + u16 feature_id; > + struct resource mmio_res; > + int *irqs; > + unsigned int num_irqs; > + struct dfl_fpga_cdev *cdev; > + const struct dfl_device_id *id_entry; > +}; > + > +/** > + * struct dfl_driver - represent an dfl device driver > + * > + * @drv: Driver model structure. > + * @id_table: Pointer to table of device IDs the driver is interested in. > + * { } member terminated. > + * @probe: Callback for device binding. > + * @remove: Callback for device unbinding. > + */ > +struct dfl_driver { > + struct device_driver drv; > + const struct dfl_device_id *id_table; > + > + int (*probe)(struct dfl_device *dfl_dev); > + void (*remove)(struct dfl_device *dfl_dev); > +}; > + > +#define to_dfl_dev(d) container_of(d, struct dfl_device, dev) > +#define to_dfl_drv(d) container_of(d, struct dfl_driver, drv) > + > +/* > + * use a macro to avoid include chaining to get THIS_MODULE > + */ > +#define dfl_driver_register(drv) \ > + __dfl_driver_register(drv, THIS_MODULE) > +int __dfl_driver_register(struct dfl_driver *dfl_drv, struct module *owner); > +void dfl_driver_unregister(struct dfl_driver *dfl_drv); > + > +/* > + * module_dfl_driver() - Helper macro for drivers that don't do > + * anything special in module init/exit. This eliminates a lot of > + * boilerplate. Each module may only use this macro once, and > + * calling it replaces module_init() and module_exit() > + */ > +#define module_dfl_driver(__dfl_driver) \ > + module_driver(__dfl_driver, dfl_driver_register, \ > + dfl_driver_unregister) > + > #endif /* __FPGA_DFL_H */