| Message ID | 20210407222625.320177-7-ben.widawsky@intel.com (mailing list archive) |
|---|---|
| State | Not Applicable, archived |
| Headers | show |
| Series | Enumerate HDM Decoder registers | expand |
On Wed, 7 Apr 2021 15:26:24 -0700 Ben Widawsky <ben.widawsky@intel.com> wrote: > Memory devices have a list of required register regions within the > register block, but this isn't required of all CXL components or > devices. To make things more tidy, and allow for easily setting up other > block types in this loop, the helper is introduced. Two things in here, the move and allowing it to be missing. I would call that out explicitly in the patch description. > > Signed-off-by: Ben Widawsky <ben.widawsky@intel.com> > --- > drivers/cxl/mem.c | 38 +++++++++++++++++++++++--------------- > 1 file changed, 23 insertions(+), 15 deletions(-) > > diff --git a/drivers/cxl/mem.c b/drivers/cxl/mem.c > index 49f651694cb0..b7342aaf38c4 100644 > --- a/drivers/cxl/mem.c > +++ b/drivers/cxl/mem.c > @@ -974,6 +974,24 @@ static int cxl_mem_dvsec(struct pci_dev *pdev, int dvsec) > return 0; > } > > +static int __cxl_setup_device_regs(struct cxl_mem *cxlm, void __iomem *base) Naming is a little unusual. Normally __ would imply unlocked or something like that, whereas here it's mostly implying more error checks. I don't immediately have a good idea for a name however... > +{ > + struct cxl_regs *regs = &cxlm->regs; > + struct pci_dev *pdev = cxlm->pdev; > + struct device *dev = &pdev->dev; > + > + cxl_setup_device_regs(dev, base, ®s->device_regs); > + if (!regs->status || !regs->mbox || !regs->memdev) { > + dev_err(dev, "registers not found: %s%s%s\n", > + !regs->status ? "status " : "", > + !regs->mbox ? "mbox " : "", > + !regs->memdev ? "memdev" : ""); > + return -ENXIO; > + } > + > + return 0; > +} > + > /** > * cxl_mem_setup_regs() - Setup necessary MMIO. > * @cxlm: The CXL memory device to communicate with. > @@ -986,12 +1004,11 @@ static int cxl_mem_dvsec(struct pci_dev *pdev, int dvsec) > */ > static int cxl_mem_setup_regs(struct cxl_mem *cxlm) > { > - struct cxl_regs *regs = &cxlm->regs; > struct pci_dev *pdev = cxlm->pdev; > struct device *dev = &pdev->dev; > u32 regloc_size, regblocks; > void __iomem *base; > - int regloc, i; > + int regloc, i, rc; > > regloc = cxl_mem_dvsec(pdev, PCI_DVSEC_ID_CXL_REGLOC_OFFSET); > if (!regloc) { > @@ -1021,23 +1038,14 @@ static int cxl_mem_setup_regs(struct cxl_mem *cxlm) > if (IS_ERR(base)) > return PTR_ERR(base); > > - cxl_setup_device_regs(dev, base, ®s->device_regs); > - if (!regs->status || !regs->mbox || !regs->memdev) { > - dev_err(dev, "registers not found: %s%s%s\n", > - !regs->status ? "status " : "", > - !regs->mbox ? "mbox " : "", > - !regs->memdev ? "memdev" : ""); > - return -ENXIO; > - } > + rc = __cxl_setup_device_regs(cxlm, base); > + if (rc) > + return rc; > + > break; > } > } > > - if (i == regblocks) { > - dev_err(dev, "Missing register locator for device registers\n"); > - return -ENXIO; > - } > - > return 0; > } >
On Wed, Apr 7, 2021 at 3:26 PM Ben Widawsky <ben.widawsky@intel.com> wrote: > > Memory devices have a list of required register regions within the > register block, but this isn't required of all CXL components or > devices. To make things more tidy, and allow for easily setting up other > block types in this loop, the helper is introduced. I don't understand the point of this or the organization choice. cxl_setup_device_regs() *is* the core implementation so there shouldn't be a "__" prefixed version wrapping it. I agree that some users will not care that some of the device registers are not found, but that won't be cxl_mem_setup_regs() making that call.
diff --git a/drivers/cxl/mem.c b/drivers/cxl/mem.c index 49f651694cb0..b7342aaf38c4 100644 --- a/drivers/cxl/mem.c +++ b/drivers/cxl/mem.c @@ -974,6 +974,24 @@ static int cxl_mem_dvsec(struct pci_dev *pdev, int dvsec) return 0; } +static int __cxl_setup_device_regs(struct cxl_mem *cxlm, void __iomem *base) +{ + struct cxl_regs *regs = &cxlm->regs; + struct pci_dev *pdev = cxlm->pdev; + struct device *dev = &pdev->dev; + + cxl_setup_device_regs(dev, base, ®s->device_regs); + if (!regs->status || !regs->mbox || !regs->memdev) { + dev_err(dev, "registers not found: %s%s%s\n", + !regs->status ? "status " : "", + !regs->mbox ? "mbox " : "", + !regs->memdev ? "memdev" : ""); + return -ENXIO; + } + + return 0; +} + /** * cxl_mem_setup_regs() - Setup necessary MMIO. * @cxlm: The CXL memory device to communicate with. @@ -986,12 +1004,11 @@ static int cxl_mem_dvsec(struct pci_dev *pdev, int dvsec) */ static int cxl_mem_setup_regs(struct cxl_mem *cxlm) { - struct cxl_regs *regs = &cxlm->regs; struct pci_dev *pdev = cxlm->pdev; struct device *dev = &pdev->dev; u32 regloc_size, regblocks; void __iomem *base; - int regloc, i; + int regloc, i, rc; regloc = cxl_mem_dvsec(pdev, PCI_DVSEC_ID_CXL_REGLOC_OFFSET); if (!regloc) { @@ -1021,23 +1038,14 @@ static int cxl_mem_setup_regs(struct cxl_mem *cxlm) if (IS_ERR(base)) return PTR_ERR(base); - cxl_setup_device_regs(dev, base, ®s->device_regs); - if (!regs->status || !regs->mbox || !regs->memdev) { - dev_err(dev, "registers not found: %s%s%s\n", - !regs->status ? "status " : "", - !regs->mbox ? "mbox " : "", - !regs->memdev ? "memdev" : ""); - return -ENXIO; - } + rc = __cxl_setup_device_regs(cxlm, base); + if (rc) + return rc; + break; } } - if (i == regblocks) { - dev_err(dev, "Missing register locator for device registers\n"); - return -ENXIO; - } - return 0; }
Memory devices have a list of required register regions within the register block, but this isn't required of all CXL components or devices. To make things more tidy, and allow for easily setting up other block types in this loop, the helper is introduced. Signed-off-by: Ben Widawsky <ben.widawsky@intel.com> --- drivers/cxl/mem.c | 38 +++++++++++++++++++++++--------------- 1 file changed, 23 insertions(+), 15 deletions(-)