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Date: Tue, 31 Oct 2017 18:29:37 -0500
From: Alan Tull <atull@...nel.org>
To: Moritz Fischer <mdf@...nel.org>
Cc: Alan Tull <atull@...nel.org>,
linux-kernel <linux-kernel@...r.kernel.org>,
linux-fpga@...r.kernel.org
Subject: Re: [PATCH 3/3] fpga: bridge: don't use drvdata in common fpga code
On Tue, Oct 31, 2017 at 3:42 PM, Alan Tull <atull@...nel.org> wrote:
> Changes to the fpga bridge code to not use drvdata in common code.
>
> Change fpga_bridge_register to not set drvdata.
>
> Change the register/unregister functions parameters to take the
> bridge struct:
> * int fpga_bridge_register(struct device *dev,
> struct fpga_bridge *bridge);
> * void fpga_bridge_unregister(struct fpga_bridge *bridge);
>
> Change the drivers that call fpga_bridge_register to alloc the struct
> fpga_bridge (using devm_kzalloc) and partly fill it, adding name,
> ops, and priv.
>
> The rationale is that setting drvdata is fine for DT based devices
> that will have one manager, bridge, or region per platform device.
> However PCIe based devices may have multiple FPGA mgr/bridge/regions
> under one pcie device. Without these changes, the PCIe solution has
> to create an extra device for each child mgr/bridge/region to hold
> drvdata.
>
> Signed-off-by: Alan Tull <atull@...nel.org>
> Reported-by: Jiuyue Ma <majiuyue@...wei.com>
> ---
> drivers/fpga/altera-fpga2sdram.c | 19 +++++++++++++++----
> drivers/fpga/altera-freeze-bridge.c | 17 ++++++++++++++---
> drivers/fpga/altera-hps2fpga.c | 15 ++++++++++++---
> drivers/fpga/fpga-bridge.c | 30 +++++++-----------------------
> drivers/fpga/xilinx-pr-decoupler.c | 14 +++++++++++---
> include/linux/fpga/fpga-bridge.h | 5 ++---
> 6 files changed, 61 insertions(+), 39 deletions(-)
>
> diff --git a/drivers/fpga/altera-fpga2sdram.c b/drivers/fpga/altera-fpga2sdram.c
> index d4eeb74..73c7bf6 100644
> --- a/drivers/fpga/altera-fpga2sdram.c
> +++ b/drivers/fpga/altera-fpga2sdram.c
> @@ -106,10 +106,15 @@ static int alt_fpga_bridge_probe(struct platform_device *pdev)
> {
> struct device *dev = &pdev->dev;
> struct alt_fpga2sdram_data *priv;
> + struct fpga_bridge *br;
> u32 enable;
> struct regmap *sysmgr;
> int ret = 0;
>
> + br = devm_kzalloc(dev, sizeof(*br), GFP_KERNEL);
> + if (!br)
> + return -ENOMEM;
> +
> priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> if (!priv)
> return -ENOMEM;
> @@ -131,8 +136,12 @@ static int alt_fpga_bridge_probe(struct platform_device *pdev)
> /* Get f2s bridge configuration saved in handoff register */
> regmap_read(sysmgr, SYSMGR_ISWGRP_HANDOFF3, &priv->mask);
>
> - ret = fpga_bridge_register(dev, F2S_BRIDGE_NAME,
> - &altera_fpga2sdram_br_ops, priv);
> + br->name = F2S_BRIDGE_NAME;
> + br->br_ops = &altera_fpga2sdram_br_ops;
> + br->priv = priv;
> + platform_set_drvdata(pdev, br);
> +
> + ret = fpga_bridge_register(dev, br);
> if (ret)
> return ret;
>
> @@ -146,7 +155,7 @@ static int alt_fpga_bridge_probe(struct platform_device *pdev)
> (enable ? "enabling" : "disabling"));
> ret = _alt_fpga2sdram_enable_set(priv, enable);
> if (ret) {
> - fpga_bridge_unregister(&pdev->dev);
> + fpga_bridge_unregister(br);
> return ret;
> }
> }
> @@ -157,7 +166,9 @@ static int alt_fpga_bridge_probe(struct platform_device *pdev)
>
> static int alt_fpga_bridge_remove(struct platform_device *pdev)
> {
> - fpga_bridge_unregister(&pdev->dev);
> + struct fpga_bridge *br = platform_get_drvdata(pdev);
> +
> + fpga_bridge_unregister(br);
>
> return 0;
> }
> diff --git a/drivers/fpga/altera-freeze-bridge.c b/drivers/fpga/altera-freeze-bridge.c
> index 6159cfcf..5fd424b 100644
> --- a/drivers/fpga/altera-freeze-bridge.c
> +++ b/drivers/fpga/altera-freeze-bridge.c
> @@ -219,6 +219,7 @@ static int altera_freeze_br_probe(struct platform_device *pdev)
> {
> struct device *dev = &pdev->dev;
> struct device_node *np = pdev->dev.of_node;
> + struct fpga_bridge *br;
> void __iomem *base_addr;
> struct altera_freeze_br_data *priv;
> struct resource *res;
> @@ -227,6 +228,10 @@ static int altera_freeze_br_probe(struct platform_device *pdev)
> if (!np)
> return -ENODEV;
>
> + br = devm_kzalloc(dev, sizeof(*br), GFP_KERNEL);
> + if (!br)
> + return -ENOMEM;
> +
> res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> base_addr = devm_ioremap_resource(dev, res);
> if (IS_ERR(base_addr))
> @@ -254,13 +259,19 @@ static int altera_freeze_br_probe(struct platform_device *pdev)
>
> priv->base_addr = base_addr;
>
> - return fpga_bridge_register(dev, FREEZE_BRIDGE_NAME,
> - &altera_freeze_br_br_ops, priv);
> + br->name = FREEZE_BRIDGE_NAME;
> + br->br_ops = &altera_freeze_br_br_ops;
> + br->priv = priv;
> + platform_set_drvdata(pdev, br);
> +
> + return fpga_bridge_register(dev, br);
> }
>
> static int altera_freeze_br_remove(struct platform_device *pdev)
> {
> - fpga_bridge_unregister(&pdev->dev);
> + struct fpga_bridge *br = platform_get_drvdata(pdev);
> +
> + fpga_bridge_unregister(br);
>
> return 0;
> }
> diff --git a/drivers/fpga/altera-hps2fpga.c b/drivers/fpga/altera-hps2fpga.c
> index 406d2f1..4539057 100644
> --- a/drivers/fpga/altera-hps2fpga.c
> +++ b/drivers/fpga/altera-hps2fpga.c
> @@ -139,6 +139,7 @@ static int alt_fpga_bridge_probe(struct platform_device *pdev)
> struct device *dev = &pdev->dev;
> struct altera_hps2fpga_data *priv;
> const struct of_device_id *of_id;
> + struct fpga_bridge *br;
> u32 enable;
> int ret;
>
> @@ -150,6 +151,10 @@ static int alt_fpga_bridge_probe(struct platform_device *pdev)
>
> priv = (struct altera_hps2fpga_data *)of_id->data;
>
> + br = devm_kzalloc(dev, sizeof(*br), GFP_KERNEL);
> + if (!br)
> + return -ENOMEM;
> +
> priv->bridge_reset = of_reset_control_get_exclusive_by_index(dev->of_node,
> 0);
> if (IS_ERR(priv->bridge_reset)) {
> @@ -190,8 +195,12 @@ static int alt_fpga_bridge_probe(struct platform_device *pdev)
> }
> }
>
> - ret = fpga_bridge_register(dev, priv->name, &altera_hps2fpga_br_ops,
> - priv);
> + br->name = priv->name;
> + br->br_ops = &altera_hps2fpga_br_ops;
> + br->priv = priv;
> + platform_set_drvdata(pdev, br);
> +
> + ret = fpga_bridge_register(dev, br);
> err:
> if (ret)
> clk_disable_unprepare(priv->clk);
> @@ -204,7 +213,7 @@ static int alt_fpga_bridge_remove(struct platform_device *pdev)
> struct fpga_bridge *bridge = platform_get_drvdata(pdev);
> struct altera_hps2fpga_data *priv = bridge->priv;
>
> - fpga_bridge_unregister(&pdev->dev);
> + fpga_bridge_unregister(bridge);
>
> clk_disable_unprepare(priv->clk);
>
> diff --git a/drivers/fpga/fpga-bridge.c b/drivers/fpga/fpga-bridge.c
> index 15ce9f1..10b582e 100644
> --- a/drivers/fpga/fpga-bridge.c
> +++ b/drivers/fpga/fpga-bridge.c
> @@ -338,41 +338,30 @@ ATTRIBUTE_GROUPS(fpga_bridge);
> *
> * Return: 0 for success, error code otherwise.
> */
> -int fpga_bridge_register(struct device *dev, const char *name,
> - const struct fpga_bridge_ops *br_ops, void *priv)
> +int fpga_bridge_register(struct device *dev, struct fpga_bridge *bridge)
> {
> - struct fpga_bridge *bridge;
> + const char *name;
> int id, ret = 0;
>
> + name = bridge->name;
> if (!name || !strlen(name)) {
> dev_err(dev, "Attempt to register with no name!\n");
> return -EINVAL;
> }
>
> - bridge = kzalloc(sizeof(*bridge), GFP_KERNEL);
> - if (!bridge)
> - return -ENOMEM;
> -
> id = ida_simple_get(&fpga_bridge_ida, 0, 0, GFP_KERNEL);
> - if (id < 0) {
> - ret = id;
> - goto error_kfree;
> - }
> + if (id < 0)
> + return id;
>
> mutex_init(&bridge->mutex);
> INIT_LIST_HEAD(&bridge->node);
>
> - bridge->name = name;
> - bridge->br_ops = br_ops;
> - bridge->priv = priv;
> -
> device_initialize(&bridge->dev);
> - bridge->dev.groups = br_ops->groups;
> + bridge->dev.groups = bridge->br_ops->groups;
> bridge->dev.class = fpga_bridge_class;
> bridge->dev.parent = dev;
> bridge->dev.of_node = dev->of_node;
> bridge->dev.id = id;
> - dev_set_drvdata(dev, bridge);
>
> ret = dev_set_name(&bridge->dev, "br%d", id);
> if (ret)
> @@ -391,8 +380,6 @@ int fpga_bridge_register(struct device *dev, const char *name,
>
> error_device:
> ida_simple_remove(&fpga_bridge_ida, id);
> -error_kfree:
> - kfree(bridge);
>
> return ret;
> }
> @@ -402,10 +389,8 @@ EXPORT_SYMBOL_GPL(fpga_bridge_register);
> * fpga_bridge_unregister - unregister a fpga bridge driver
> * @dev: FPGA bridge device from pdev
> */
> -void fpga_bridge_unregister(struct device *dev)
> +void fpga_bridge_unregister(struct fpga_bridge *bridge)
> {
> - struct fpga_bridge *bridge = dev_get_drvdata(dev);
> -
> /*
> * If the low level driver provides a method for putting bridge into
> * a desired state upon unregister, do it.
> @@ -422,7 +407,6 @@ static void fpga_bridge_dev_release(struct device *dev)
> struct fpga_bridge *bridge = to_fpga_bridge(dev);
>
> ida_simple_remove(&fpga_bridge_ida, bridge->dev.id);
> - kfree(bridge);
> }
>
> static int __init fpga_bridge_dev_init(void)
> diff --git a/drivers/fpga/xilinx-pr-decoupler.c b/drivers/fpga/xilinx-pr-decoupler.c
> index e359930..317b2fb 100644
> --- a/drivers/fpga/xilinx-pr-decoupler.c
> +++ b/drivers/fpga/xilinx-pr-decoupler.c
> @@ -94,9 +94,14 @@ MODULE_DEVICE_TABLE(of, xlnx_pr_decoupler_of_match);
> static int xlnx_pr_decoupler_probe(struct platform_device *pdev)
> {
> struct xlnx_pr_decoupler_data *priv;
> + struct fpga_bridge *br;
> int err;
> struct resource *res;
>
> + br = devm_kzalloc(dev, sizeof(*br), GFP_KERNEL);
Should be &pdev->dev instead of dev.
Alan
> + if (!br)
> + return -ENOMEM;
> +
> priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
> if (!priv)
> return -ENOMEM;
> @@ -120,9 +125,12 @@ static int xlnx_pr_decoupler_probe(struct platform_device *pdev)
>
> clk_disable(priv->clk);
>
> - err = fpga_bridge_register(&pdev->dev, "Xilinx PR Decoupler",
> - &xlnx_pr_decoupler_br_ops, priv);
> + br->name = "Xilinx PR Decoupler";
> + br->br_ops = &xlnx_pr_decoupler_br_ops;
> + br->priv = priv;
> + platform_set_drvdata(pdev, br);
>
> + err = fpga_bridge_register(&pdev->dev, br);
> if (err) {
> dev_err(&pdev->dev, "unable to register Xilinx PR Decoupler");
> clk_unprepare(priv->clk);
> @@ -137,7 +145,7 @@ static int xlnx_pr_decoupler_remove(struct platform_device *pdev)
> struct fpga_bridge *bridge = platform_get_drvdata(pdev);
> struct xlnx_pr_decoupler_data *p = bridge->priv;
>
> - fpga_bridge_unregister(&pdev->dev);
> + fpga_bridge_unregister(bridge);
>
> clk_unprepare(p->clk);
>
> diff --git a/include/linux/fpga/fpga-bridge.h b/include/linux/fpga/fpga-bridge.h
> index 65d3311..9e80dbf 100644
> --- a/include/linux/fpga/fpga-bridge.h
> +++ b/include/linux/fpga/fpga-bridge.h
> @@ -60,8 +60,7 @@ int of_fpga_bridge_get_to_list(struct device_node *np,
> struct fpga_image_info *info,
> struct list_head *bridge_list);
>
> -int fpga_bridge_register(struct device *dev, const char *name,
> - const struct fpga_bridge_ops *br_ops, void *priv);
> -void fpga_bridge_unregister(struct device *dev);
> +int fpga_bridge_register(struct device *dev, struct fpga_bridge *br);
> +void fpga_bridge_unregister(struct fpga_bridge *br);
>
> #endif /* _LINUX_FPGA_BRIDGE_H */
> --
> 2.7.4
>
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