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Message-ID: <MWHPR02MB26239A3F539DE8E053D512D5C2A09@MWHPR02MB2623.namprd02.prod.outlook.com>
Date: Fri, 22 Jan 2021 10:34:15 +0000
From: Nava kishore Manne <navam@...inx.com>
To: Moritz Fischer <mdf@...nel.org>
CC: "trix@...hat.com" <trix@...hat.com>,
"robh+dt@...nel.org" <robh+dt@...nel.org>,
Michal Simek <michals@...inx.com>,
"linux-fpga@...r.kernel.org" <linux-fpga@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
git <git@...inx.com>,
"chinnikishore369@...il.com" <chinnikishore369@...il.com>,
Appana Durga Kedareswara Rao <appanad@...inx.com>
Subject: RE: [PATCH 3/3] fpga: versal-fpga: Add versal fpga manager driver
Hi Moritz,
Thanks for the review.
Please find my response inline.
> -----Original Message-----
> From: Moritz Fischer <mdf@...nel.org>
> Sent: Tuesday, January 19, 2021 6:03 AM
> To: Nava kishore Manne <navam@...inx.com>
> Cc: mdf@...nel.org; trix@...hat.com; robh+dt@...nel.org; Michal Simek
> <michals@...inx.com>; linux-fpga@...r.kernel.org;
> devicetree@...r.kernel.org; linux-arm-kernel@...ts.infradead.org; linux-
> kernel@...r.kernel.org; git <git@...inx.com>; chinnikishore369@...il.com;
> Appana Durga Kedareswara Rao <appanad@...inx.com>
> Subject: Re: [PATCH 3/3] fpga: versal-fpga: Add versal fpga manager driver
>
> Hi Nava,
>
> On Mon, Jan 18, 2021 at 08:13:18AM +0530, Nava kishore Manne wrote:
> > This patch adds driver for versal fpga manager.
> Nit: Add support for Xilinx Versal FPGA manager
Will fix in v2.
> >
> > PDI source type can be DDR, OCM, QSPI flash etc..
> No idea what PDI is :)
Programmable device image (PDI).
This file is generated by Xilinx Vivado tool and it contains configuration data objects.
> > But driver allocates memory always from DDR, Since driver supports
> > only DDR source type.
> >
> > Signed-off-by: Appana Durga Kedareswara rao
> > <appana.durga.rao@...inx.com>
> > Signed-off-by: Nava kishore Manne <nava.manne@...inx.com>
> > ---
> > drivers/fpga/Kconfig | 8 ++
> > drivers/fpga/Makefile | 1 +
> > drivers/fpga/versal-fpga.c | 149
> > +++++++++++++++++++++++++++++++++++++
> > 3 files changed, 158 insertions(+)
> > create mode 100644 drivers/fpga/versal-fpga.c
> >
> > diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig index
> > 5645226ca3ce..9f779c3a6739 100644
> > --- a/drivers/fpga/Kconfig
> > +++ b/drivers/fpga/Kconfig
> > @@ -216,4 +216,12 @@ config FPGA_MGR_ZYNQMP_FPGA
> > to configure the programmable logic(PL) through PS
> > on ZynqMP SoC.
> >
> > +config FPGA_MGR_VERSAL_FPGA
> > + tristate "Xilinx Versal FPGA"
> > + depends on ARCH_ZYNQMP || COMPILE_TEST
> > + help
> > + Select this option to enable FPGA manager driver support for
> > + Xilinx Versal SOC. This driver uses the versal soc firmware
> > + interface to load programmable logic(PL) images
> > + on versal soc.
> > endif # FPGA
> > diff --git a/drivers/fpga/Makefile b/drivers/fpga/Makefile index
> > d8e21dfc6778..40c9adb6a644 100644
> > --- a/drivers/fpga/Makefile
> > +++ b/drivers/fpga/Makefile
> > @@ -18,6 +18,7 @@ obj-$(CONFIG_FPGA_MGR_TS73XX) +=
> ts73xx-fpga.o
> > obj-$(CONFIG_FPGA_MGR_XILINX_SPI) += xilinx-spi.o
> > obj-$(CONFIG_FPGA_MGR_ZYNQ_FPGA) += zynq-fpga.o
> > obj-$(CONFIG_FPGA_MGR_ZYNQMP_FPGA) += zynqmp-fpga.o
> > +obj-$(CONFIG_FPGA_MGR_VERSAL_FPGA) += versal-fpga.o
> > obj-$(CONFIG_ALTERA_PR_IP_CORE) += altera-pr-ip-core.o
> > obj-$(CONFIG_ALTERA_PR_IP_CORE_PLAT) += altera-pr-ip-core-plat.o
> >
> > diff --git a/drivers/fpga/versal-fpga.c b/drivers/fpga/versal-fpga.c
> > new file mode 100644 index 000000000000..2a42aa78b182
> > --- /dev/null
> > +++ b/drivers/fpga/versal-fpga.c
> > @@ -0,0 +1,149 @@
> > +// SPDX-License-Identifier: GPL-2.0+
> > +/*
> > + * Copyright (C) 2021 Xilinx, Inc.
> > + */
> > +
> > +#include <linux/dma-mapping.h>
> > +#include <linux/fpga/fpga-mgr.h>
> > +#include <linux/io.h>
> > +#include <linux/kernel.h>
> > +#include <linux/module.h>
> > +#include <linux/of_address.h>
> > +#include <linux/string.h>
> > +#include <linux/firmware/xlnx-zynqmp.h>
> > +
> > +/* Constant Definitions */
> > +#define PDI_SOURCE_TYPE 0xF
> > +
> > +/**
> > + * struct versal_fpga_priv - Private data structure
> > + * @dev: Device data structure
> > + * @flags: flags which is used to identify the PL Image type
> > + */
> > +struct versal_fpga_priv {
> > + struct device *dev;
> > + u32 flags;
> This seems unused ... please introduce them when/if you start using them.
Will fix in v2.
> > +};
> > +
> > +static int versal_fpga_ops_write_init(struct fpga_manager *mgr,
> > + struct fpga_image_info *info,
> > + const char *buf, size_t size) {
> > + struct versal_fpga_priv *priv;
> > +
> > + priv = mgr->priv;
> > + priv->flags = info->flags;
> ? What uses this ? It seems this function could just be 'return 0' right now.
Will fix in v2.
> > +
> > + return 0;
> > +}
> > +
> > +static int versal_fpga_ops_write(struct fpga_manager *mgr,
> > + const char *buf, size_t size)
> > +{
> > + struct versal_fpga_priv *priv;
> > + dma_addr_t dma_addr = 0;
> > + char *kbuf;
> > + int ret;
> > +
> > + priv = mgr->priv;
> > +
> > + kbuf = dma_alloc_coherent(priv->dev, size, &dma_addr,
> GFP_KERNEL);
> > + if (!kbuf)
> > + return -ENOMEM;
> > +
> > + memcpy(kbuf, buf, size);
> > +
> > + wmb(); /* ensure all writes are done before initiate FW call */
> > +
> > + ret = zynqmp_pm_load_pdi(PDI_SOURCE_TYPE, dma_addr);
> > +
> > + dma_free_coherent(priv->dev, size, kbuf, dma_addr);
> > +
> > + return ret;
> > +}
> > +
> > +static int versal_fpga_ops_write_complete(struct fpga_manager *mgr,
> > + struct fpga_image_info *info)
> > +{
> > + return 0;
> > +}
> > +
> > +static enum fpga_mgr_states versal_fpga_ops_state(struct fpga_manager
> > +*mgr) {
> > + return FPGA_MGR_STATE_OPERATING;
> Is that always the case? Shouldn't that be FPGA_MGR_STATE_UNKNOWN?
For Versal SoC base PDI is always configured prior to Linux boot up. So I make the fpga state as OPERATING.
Please let know if it is not a proper implementation will think about the alternate solution.
> > +}
> > +
> > +static const struct fpga_manager_ops versal_fpga_ops = {
> > + .state = versal_fpga_ops_state,
> > + .write_init = versal_fpga_ops_write_init,
> > + .write = versal_fpga_ops_write,
> > + .write_complete = versal_fpga_ops_write_complete, };
> > +
> > +static int versal_fpga_probe(struct platform_device *pdev) {
> > + struct device *dev = &pdev->dev;
> > + struct versal_fpga_priv *priv;
> > + struct fpga_manager *mgr;
> > + int err, ret;
> Please pick one, err or ret. 'err' seems unused?
Will fix in v2.
> > +
> > + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> > + if (!priv)
> > + return -ENOMEM;
> > +
> > + priv->dev = dev;
> > + ret = dma_set_mask_and_coherent(&pdev->dev,
> DMA_BIT_MASK(32));
> > + if (ret < 0) {
> > + dev_err(dev, "no usable DMA configuration");
> Nit: "no usable DMA configuration\n"
Will fix in v2.
> > + return ret;
> > + }
> > +
> > + mgr = devm_fpga_mgr_create(dev, "Xilinx Versal FPGA Manager",
> > + &versal_fpga_ops, priv);
> > + if (!mgr)
> > + return -ENOMEM;
> > +
> > + platform_set_drvdata(pdev, mgr);
> > +
>
> Replace this part:
> > + err = fpga_mgr_register(mgr);
> > + if (err) {
> > + dev_err(dev, "unable to register FPGA manager");
> > + fpga_mgr_free(mgr);
> > + return err;
> > + }
>
> with:
> return devm_fpga_mgr_register(mgr);
>
> I tried to get rid of the boilerplate, since every driver repeats it (and above
> calling fpga_mgr_free(mgr) on a devm_fpga_mgr_create() created FPGA
> manager is wrong?) :)
Thanks for pointing it. Will fix in v2.
> > +
> > + return 0;
> > +}
> > +
>
> Then
> > +static int versal_fpga_remove(struct platform_device *pdev) {
> > + struct fpga_manager *mgr = platform_get_drvdata(pdev);
> > +
> > + fpga_mgr_unregister(mgr);
> > + fpga_mgr_free(mgr);
> > +
> > + return 0;
> > +}
> drop this since cleanup is now automatic.
Thanks for pointing it. Will fix in v2.
> > +
> > +static const struct of_device_id versal_fpga_of_match[] = {
> > + { .compatible = "xlnx,versal-fpga", },
> > + {},
> > +};
> > +
> Nit: Drop the newline
Will fix in v2.
> > +MODULE_DEVICE_TABLE(of, versal_fpga_of_match);
> > +
> > +static struct platform_driver versal_fpga_driver = {
> > + .probe = versal_fpga_probe,
> > + .remove = versal_fpga_remove,
> > + .driver = {
> > + .name = "versal_fpga_manager",
> > + .of_match_table = of_match_ptr(versal_fpga_of_match),
> > + },
> > +};
> > +
> Nit: Drop the newline
Will fix in v2.
Regards,
Navakishore.
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