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Date: Tue, 21 Jul 2020 15:34:16 +0800
From: Xu Yilun <yilun.xu@...el.com>
To: Tom Rix <trix@...hat.com>
Cc: mdf@...nel.org, linux-fpga@...r.kernel.org,
linux-kernel@...r.kernel.org, lgoncalv@...hat.com,
Wu Hao <hao.wu@...el.com>,
Matthew Gerlach <matthew.gerlach@...ux.intel.com>,
Russ Weight <russell.h.weight@...el.com>
Subject: Re: [PATCH 1/2] fpga: dfl: map feature mmio resources in their own
feature drivers
On Fri, Jul 17, 2020 at 09:51:34AM -0700, Tom Rix wrote:
> Mostly little stuff.
>
> Consider refactoring create_feature_instance.
>
> Tom
>
> > diff --git a/drivers/fpga/dfl-pci.c b/drivers/fpga/dfl-pci.c
> > index e220bec..22dc025 100644
> > --- a/drivers/fpga/dfl-pci.c
> > +++ b/drivers/fpga/dfl-pci.c
> > @@ -39,6 +39,11 @@ static void __iomem *cci_pci_ioremap_bar(struct pci_dev *pcidev, int bar)
> > return pcim_iomap_table(pcidev)[bar];
> > }
> >
> > +static void cci_pci_iounmap_bars(struct pci_dev *pcidev, int mapped_bars)
> > +{
> > + pcim_iounmap_regions(pcidev, mapped_bars);
> > +}
>
> A singleton, called only one place. Consider replacing with a direct call.
I could remove it.
>
>
> > +
> > static int cci_pci_alloc_irq(struct pci_dev *pcidev)
> > {
> > int ret, nvec = pci_msix_vec_count(pcidev);
> > @@ -123,7 +128,7 @@ static int *cci_pci_create_irq_table(struct pci_dev *pcidev, unsigned int nvec)
> > static int cci_enumerate_feature_devs(struct pci_dev *pcidev)
> > {
> > struct cci_drvdata *drvdata = pci_get_drvdata(pcidev);
> > - int port_num, bar, i, nvec, ret = 0;
> > + int port_num, bar, i, nvec, mapped_bars, ret = 0;
>
> Shouldn't mapped_bars be at least unsigned and maybe either uint32_t or uint64_t ?
>
> I see pcim_ioumap_regions has int as parameter. boo
That's why I define the mapped_bars as an int, to avoid casting.
>
> > struct dfl_fpga_enum_info *info;
> > struct dfl_fpga_cdev *cdev;
> > resource_size_t start, len;
> > @@ -163,6 +168,8 @@ static int cci_enumerate_feature_devs(struct pci_dev *pcidev)
> > goto irq_free_exit;
> > }
> >
> > + mapped_bars = BIT(0);
> > +
> > /*
> > * PF device has FME and Ports/AFUs, and VF device only has one
> > * Port/AFU. Check them and add related "Device Feature List" info
> > @@ -172,7 +179,7 @@ static int cci_enumerate_feature_devs(struct pci_dev *pcidev)
> > start = pci_resource_start(pcidev, 0);
> > len = pci_resource_len(pcidev, 0);
> >
> > - dfl_fpga_enum_info_add_dfl(info, start, len, base);
> > + dfl_fpga_enum_info_add_dfl(info, start, len);
> >
> > /*
> > * find more Device Feature Lists (e.g. Ports) per information
> > @@ -200,22 +207,26 @@ static int cci_enumerate_feature_devs(struct pci_dev *pcidev)
> > if (!base)
> > continue;
> >
> > + mapped_bars |= BIT(bar);
> > +
> > start = pci_resource_start(pcidev, bar) + offset;
> > len = pci_resource_len(pcidev, bar) - offset;
> >
> > - dfl_fpga_enum_info_add_dfl(info, start, len,
> > - base + offset);
> > + dfl_fpga_enum_info_add_dfl(info, start, len);
> > }
> > } else if (dfl_feature_is_port(base)) {
> > start = pci_resource_start(pcidev, 0);
> > len = pci_resource_len(pcidev, 0);
> >
> > - dfl_fpga_enum_info_add_dfl(info, start, len, base);
> > + dfl_fpga_enum_info_add_dfl(info, start, len);
> > } else {
> > ret = -ENODEV;
> > goto irq_free_exit;
> > }
> >
> > + /* release I/O mappings for next step enumeration */
> > + cci_pci_iounmap_bars(pcidev, mapped_bars);
> There is no iounmap_bars in error handling, likely need to add this.
> > +
> > /* start enumeration with prepared enumeration information */
> > cdev = dfl_fpga_feature_devs_enumerate(info);
> > if (IS_ERR(cdev)) {
> > diff --git a/drivers/fpga/dfl.c b/drivers/fpga/dfl.c
> > index 649958a..7dc6411 100644
> > --- a/drivers/fpga/dfl.c
> > +++ b/drivers/fpga/dfl.c
> > @@ -250,6 +250,11 @@ int dfl_fpga_check_port_id(struct platform_device *pdev, void *pport_id)
> > }
> > EXPORT_SYMBOL_GPL(dfl_fpga_check_port_id);
> >
> > +static bool is_header_feature(struct dfl_feature *feature)
> > +{
> > + return feature->id == FEATURE_ID_FIU_HEADER;
> Could this be a macro ?
> > +}
> > +
> > /**
> > * dfl_fpga_dev_feature_uinit - uinit for sub features of dfl feature device
> > * @pdev: feature device.
> > @@ -273,8 +278,20 @@ static int dfl_feature_instance_init(struct platform_device *pdev,
> > 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, "fail to get iomem resource!\n");
> > + return PTR_ERR(base);
> > + }
> > +
> > + feature->ioaddr = base;
> > + }
> > +
> > if (drv->ops->init) {
> > ret = drv->ops->init(pdev, feature);
> > if (ret)
> > @@ -427,7 +444,9 @@ EXPORT_SYMBOL_GPL(dfl_fpga_dev_ops_unregister);
> > * @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 feature device in enumeration.
> > + * @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.
> > */
> > @@ -439,6 +458,9 @@ struct build_feature_devs_info {
> >
> > struct platform_device *feature_dev;
> > void __iomem *ioaddr;
> > + resource_size_t start;
> > + resource_size_t len;
> > +
> extra whitespace, remove
> > struct list_head sub_features;
> > int feature_num;
> > };
> > @@ -484,10 +506,7 @@ static int build_info_commit_dev(struct build_feature_devs_info *binfo)
> > struct dfl_feature_platform_data *pdata;
> > struct dfl_feature_info *finfo, *p;
> > enum dfl_id_type type;
> > - int ret, index = 0;
> > -
> > - if (!fdev)
> > - return 0;
> > + int ret, index = 0, res_idx = 0;
> >
> > type = feature_dev_id_type(fdev);
> > if (WARN_ON_ONCE(type >= DFL_ID_MAX))
> > @@ -530,16 +549,30 @@ static int build_info_commit_dev(struct build_feature_devs_info *binfo)
> >
> > /* 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 *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->resource_index = index;
> > - feature->ioaddr = finfo->ioaddr;
> > - fdev->resource[index++] = finfo->mmio_res;
> > +
> > + /*
> > + * map header resource for dfl bus device. Don't add header
> > + * resource to feature devices, or the resource tree will be
> > + * disordered and cause warning on resource release
> > + */
> > + 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);
> feature->ioaddr is garbage, is this ok ?
> > + } 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,
> > @@ -582,19 +615,13 @@ static int build_info_commit_dev(struct build_feature_devs_info *binfo)
> >
> > static int
> > build_info_create_dev(struct build_feature_devs_info *binfo,
> > - enum dfl_id_type type, void __iomem *ioaddr)
> > + enum dfl_id_type type)
> > {
> > struct platform_device *fdev;
> > - int ret;
> >
> > if (type >= DFL_ID_MAX)
> > return -EINVAL;
> >
> > - /* we will create a new device, commit current device first */
> > - ret = build_info_commit_dev(binfo);
> > - if (ret)
> > - return ret;
> > -
> > /*
> > * we use -ENODEV as the initialization indicator which indicates
> > * whether the id need to be reclaimed
> > @@ -605,7 +632,7 @@ build_info_create_dev(struct build_feature_devs_info *binfo,
> >
> > binfo->feature_dev = fdev;
> > binfo->feature_num = 0;
> > - binfo->ioaddr = ioaddr;
> > +
> > INIT_LIST_HEAD(&binfo->sub_features);
> >
> > fdev->id = dfl_id_alloc(type, &fdev->dev);
> > @@ -747,18 +774,17 @@ static int parse_feature_irqs(struct build_feature_devs_info *binfo,
> > */
> > static int
> > create_feature_instance(struct build_feature_devs_info *binfo,
> > - struct dfl_fpga_enum_dfl *dfl, resource_size_t ofst,
> > - resource_size_t size, u64 fid)
> > + resource_size_t ofst, resource_size_t size, u64 fid)
> > {
> > unsigned int irq_base, nr_irqs;
> > struct dfl_feature_info *finfo;
> > int ret;
> >
> > /* read feature size and id if inputs are invalid */
> > - size = size ? size : feature_size(dfl->ioaddr + ofst);
> > - fid = fid ? fid : feature_id(dfl->ioaddr + ofst);
> > + size = size ? size : feature_size(binfo->ioaddr + ofst);
> > + fid = fid ? fid : feature_id(binfo->ioaddr + ofst);
>
> This is complicated. based on fiu,afu or private calling. Why not have a function ptr
>
> struct build_feature_devs_info {
>
> void (*find_info) (...)
>
> }
>
> find_info_fiu (..) {
>
> size = feature_size(..)
>
> fid = feature_id(..)
>
> }
I think we may have another patch to optimize the feature_id.
But in my opinion, the feature_id call is only used during enumeration.
So it may not be necessary we have a function ptr for the one-off
function.
>
> >
> > - if (dfl->len - ofst < size)
> > + if (binfo->len - ofst < size)
> > return -EINVAL;
> >
> > ret = parse_feature_irqs(binfo, ofst, fid, &irq_base, &nr_irqs);
> > @@ -770,12 +796,11 @@ create_feature_instance(struct build_feature_devs_info *binfo,
> > return -ENOMEM;
> >
> > finfo->fid = fid;
> > - finfo->mmio_res.start = dfl->start + ofst;
> > + finfo->mmio_res.start = binfo->start + ofst;
> > finfo->mmio_res.end = finfo->mmio_res.start + size - 1;
> > finfo->mmio_res.flags = IORESOURCE_MEM;
> > finfo->irq_base = irq_base;
> > finfo->nr_irqs = nr_irqs;
> > - finfo->ioaddr = dfl->ioaddr + ofst;
> >
> > list_add_tail(&finfo->node, &binfo->sub_features);
> > binfo->feature_num++;
> > @@ -784,7 +809,6 @@ create_feature_instance(struct build_feature_devs_info *binfo,
> > }
> >
> > static int parse_feature_port_afu(struct build_feature_devs_info *binfo,
> > - struct dfl_fpga_enum_dfl *dfl,
> > resource_size_t ofst)
> > {
> > u64 v = readq(binfo->ioaddr + PORT_HDR_CAP);
> > @@ -792,11 +816,10 @@ static int parse_feature_port_afu(struct build_feature_devs_info *binfo,
> >
> > WARN_ON(!size);
> >
> > - return create_feature_instance(binfo, dfl, ofst, size, FEATURE_ID_AFU);
> > + return create_feature_instance(binfo, ofst, size, FEATURE_ID_AFU);
> > }
> >
> > static int parse_feature_afu(struct build_feature_devs_info *binfo,
> > - struct dfl_fpga_enum_dfl *dfl,
> > resource_size_t ofst)
> > {
> > if (!binfo->feature_dev) {
> > @@ -806,7 +829,7 @@ static int parse_feature_afu(struct build_feature_devs_info *binfo,
> >
> > switch (feature_dev_id_type(binfo->feature_dev)) {
> > case PORT_ID:
> > - return parse_feature_port_afu(binfo, dfl, ofst);
> > + return parse_feature_port_afu(binfo, ofst);
> > default:
> > dev_info(binfo->dev, "AFU belonging to FIU %s is not supported yet.\n",
> > binfo->feature_dev->name);
> > @@ -815,35 +838,91 @@ static int parse_feature_afu(struct build_feature_devs_info *binfo,
> > return 0;
> > }
> >
> > +static bool is_feature_dev_detected(struct build_feature_devs_info *binfo)
> > +{
> > + return !!binfo->feature_dev;
> Another macro.
> > +}
> > +
> > +static void dfl_binfo_shift(struct build_feature_devs_info *binfo,
> > + resource_size_t ofst)
> shift? where is shifting happening. A better name would be dfl_binfo_update or dfl_binfo_increment
> > +{
> > + binfo->start = binfo->start + ofst;
> > + binfo->len = binfo->len - ofst;
> > +}
> > +
> > +static int dfl_binfo_prepare(struct build_feature_devs_info *binfo,
> > + resource_size_t start, resource_size_t len)
> > +{
> > + struct device *dev = binfo->dev;
> > + void __iomem *ioaddr;
> > +
> > + if (!devm_request_mem_region(dev, start, len, dev_name(dev))) {
> > + dev_err(dev, "request region fail, start:%pa, len:%pa\n",
> > + &start, &len);
> > + return -ENOMEM;
> > + }
> > +
> > + ioaddr = devm_ioremap(dev, start, len);
> > + if (!ioaddr) {
> > + dev_err(dev, "ioremap region fail, start:%pa, len:%pa\n",
> > + &start, &len);
> > + devm_release_mem_region(dev, start, len);
> > + return -EFAULT;
> > + }
> > +
> > + binfo->start = start;
> > + binfo->len = len;
> > + binfo->ioaddr = ioaddr;
> > +
> > + return 0;
> > +}
> > +
> > +static void dfl_binfo_finish(struct build_feature_devs_info *binfo)
> > +{
> > + devm_iounmap(binfo->dev, binfo->ioaddr);
> > + devm_release_mem_region(binfo->dev, binfo->start, binfo->len);
> > +}
> > +
> > static int parse_feature_fiu(struct build_feature_devs_info *binfo,
> > - struct dfl_fpga_enum_dfl *dfl,
> > resource_size_t ofst)
> > {
> > u32 id, offset;
> > u64 v;
> > int ret = 0;
> >
> > - v = readq(dfl->ioaddr + ofst + DFH);
> > + if (is_feature_dev_detected(binfo)) {
> > + dfl_binfo_finish(binfo);
> > +
> > + ret = build_info_commit_dev(binfo);
> > + if (ret)
> > + return ret;
> > +
> > + dfl_binfo_prepare(binfo, binfo->start + ofst,
> > + binfo->len - ofst);
> Check status of dfl_binfo_prepare
Yes.
> > + } else {
> > + dfl_binfo_shift(binfo, ofst);
> > + }
> > +
> > + v = readq(binfo->ioaddr + DFH);
> > id = FIELD_GET(DFH_ID, v);
> >
> > /* create platform device for dfl feature dev */
> > - ret = build_info_create_dev(binfo, dfh_id_to_type(id),
> > - dfl->ioaddr + ofst);
> > + ret = build_info_create_dev(binfo, dfh_id_to_type(id));
> > if (ret)
> > return ret;
> >
> > - ret = create_feature_instance(binfo, dfl, ofst, 0, 0);
> > + ret = create_feature_instance(binfo, 0, 0, 0);
> > if (ret)
> > return ret;
> > /*
> > * find and parse FIU's child AFU via its NEXT_AFU register.
> > * please note that only Port has valid NEXT_AFU pointer per spec.
> > */
> > - v = readq(dfl->ioaddr + ofst + NEXT_AFU);
> > + v = readq(binfo->ioaddr + NEXT_AFU);
> >
> > offset = FIELD_GET(NEXT_AFU_NEXT_DFH_OFST, v);
> > if (offset)
> > - return parse_feature_afu(binfo, dfl, ofst + offset);
> > + return parse_feature_afu(binfo, offset);
> >
> > dev_dbg(binfo->dev, "No AFUs detected on FIU %d\n", id);
> >
> > @@ -851,16 +930,15 @@ static int parse_feature_fiu(struct build_feature_devs_info *binfo,
> > }
> >
> > static int parse_feature_private(struct build_feature_devs_info *binfo,
> > - struct dfl_fpga_enum_dfl *dfl,
> > resource_size_t ofst)
> > {
> > if (!binfo->feature_dev) {
> > dev_err(binfo->dev, "the private feature %llx does not belong to any AFU.\n",
> > - (unsigned long long)feature_id(dfl->ioaddr + ofst));
> > + (unsigned long long)feature_id(binfo->ioaddr + ofst));
> > return -EINVAL;
> > }
> >
> > - return create_feature_instance(binfo, dfl, ofst, 0, 0);
> > + return create_feature_instance(binfo, ofst, 0, 0);
> > }
> >
> > /**
> > @@ -868,24 +946,24 @@ static int parse_feature_private(struct build_feature_devs_info *binfo,
> > *
> > * @binfo: build feature devices information.
> > * @dfl: device feature list to parse
> > - * @ofst: offset to feature header on this device feature list
> > + * @ofst: offset to current FIU header
> > */
> > static int parse_feature(struct build_feature_devs_info *binfo,
> > - struct dfl_fpga_enum_dfl *dfl, resource_size_t ofst)
> > + resource_size_t ofst)
> > {
> > u64 v;
> > u32 type;
> >
> > - v = readq(dfl->ioaddr + ofst + DFH);
> > + v = readq(binfo->ioaddr + ofst + DFH);
> > type = FIELD_GET(DFH_TYPE, v);
> >
> > switch (type) {
> > case DFH_TYPE_AFU:
> > - return parse_feature_afu(binfo, dfl, ofst);
> > + return parse_feature_afu(binfo, ofst);
> > case DFH_TYPE_PRIVATE:
> > - return parse_feature_private(binfo, dfl, ofst);
> > + return parse_feature_private(binfo, ofst);
> > case DFH_TYPE_FIU:
> > - return parse_feature_fiu(binfo, dfl, ofst);
> > + return parse_feature_fiu(binfo, ofst);
> > default:
> > dev_info(binfo->dev,
> > "Feature Type %x is not supported.\n", type);
> > @@ -897,12 +975,18 @@ static int parse_feature(struct build_feature_devs_info *binfo,
> > static int parse_feature_list(struct build_feature_devs_info *binfo,
> > struct dfl_fpga_enum_dfl *dfl)
> > {
> > - void __iomem *start = dfl->ioaddr;
> > - void __iomem *end = dfl->ioaddr + dfl->len;
> > + resource_size_t start, end;
> > int ret = 0;
> > u32 ofst = 0;
> > u64 v;
> >
> > + ret = dfl_binfo_prepare(binfo, dfl->start, dfl->len);
> > + if (ret)
> > + return ret;
> > +
> > + start = dfl->start;
> > + end = start + dfl->len;
> > +
> > /* walk through the device feature list via DFH's next DFH pointer. */
> > for (; start < end; start += ofst) {
> > if (end - start < DFH_SIZE) {
> > @@ -910,11 +994,11 @@ static int parse_feature_list(struct build_feature_devs_info *binfo,
> > return -EINVAL;
> > }
> >
> > - ret = parse_feature(binfo, dfl, start - dfl->ioaddr);
> > + ret = parse_feature(binfo, start - binfo->start);
> > if (ret)
> > return ret;
> >
> > - v = readq(start + DFH);
> > + v = readq(binfo->ioaddr + start - binfo->start + DFH);
> > ofst = FIELD_GET(DFH_NEXT_HDR_OFST, v);
> >
> > /* stop parsing if EOL(End of List) is set or offset is 0 */
> > @@ -923,6 +1007,8 @@ static int parse_feature_list(struct build_feature_devs_info *binfo,
> > }
> >
> > /* commit current feature device when reach the end of list */
> > + dfl_binfo_finish(binfo);
> > +
> > return build_info_commit_dev(binfo);
> > }
> >
> > @@ -976,7 +1062,6 @@ EXPORT_SYMBOL_GPL(dfl_fpga_enum_info_free);
> > * @info: ptr to dfl_fpga_enum_info
> > * @start: mmio resource address of the device feature list.
> > * @len: mmio resource length of the device feature list.
> > - * @ioaddr: mapped mmio resource address of the device feature list.
> > *
> > * One FPGA device may have one or more Device Feature Lists (DFLs), use this
> > * function to add information of each DFL to common data structure for next
> > @@ -985,8 +1070,7 @@ EXPORT_SYMBOL_GPL(dfl_fpga_enum_info_free);
> > * Return: 0 on success, negative error code otherwise.
> > */
> > int dfl_fpga_enum_info_add_dfl(struct dfl_fpga_enum_info *info,
> > - resource_size_t start, resource_size_t len,
> > - void __iomem *ioaddr)
> > + resource_size_t start, resource_size_t len)
> > {
> > struct dfl_fpga_enum_dfl *dfl;
> >
> > @@ -996,7 +1080,6 @@ int dfl_fpga_enum_info_add_dfl(struct dfl_fpga_enum_info *info,
> >
> > dfl->start = start;
> > dfl->len = len;
> > - dfl->ioaddr = ioaddr;
> >
> > list_add_tail(&dfl->node, &info->dfls);
> >
> > diff --git a/drivers/fpga/dfl.h b/drivers/fpga/dfl.h
> > index a32dfba..f605c28 100644
> > --- a/drivers/fpga/dfl.h
> > +++ b/drivers/fpga/dfl.h
> > @@ -441,22 +441,18 @@ struct dfl_fpga_enum_info {
> > *
> > * @start: base address of this device feature list.
> > * @len: size of this device feature list.
> > - * @ioaddr: mapped base address of this device feature list.
> > * @node: node in list of device feature lists.
> > */
> > struct dfl_fpga_enum_dfl {
> > resource_size_t start;
> > resource_size_t len;
> extra white space
I can remove it.
Thanks,
Yilun
> >
> > - void __iomem *ioaddr;
> > -
> > struct list_head node;
> > };
> >
> > struct dfl_fpga_enum_info *dfl_fpga_enum_info_alloc(struct device *dev);
> > int dfl_fpga_enum_info_add_dfl(struct dfl_fpga_enum_info *info,
> > - resource_size_t start, resource_size_t len,
> > - void __iomem *ioaddr);
> > + resource_size_t start, resource_size_t len);
> > int dfl_fpga_enum_info_add_irq(struct dfl_fpga_enum_info *info,
> > unsigned int nr_irqs, int *irq_table);
> > void dfl_fpga_enum_info_free(struct dfl_fpga_enum_info *info);
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