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    SubjectRe: [PATCH 1/2] xen-pciback: Use dev_printk() when possible
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    On Wed, 2020-05-27 at 15:34 -0700, Boris Ostrovsky wrote:
    > On 5/27/20 1:43 PM, Bjorn Helgaas wrote:
    > > @@ -155,8 +157,8 @@ int xen_pcibk_config_read(struct pci_dev *dev, int offset, int size,
    > > u32 value = 0, tmp_val;
    > >
    > > if (unlikely(verbose_request))
    > > - printk(KERN_DEBUG DRV_NAME ": %s: read %d bytes at 0x%x\n",
    > > - pci_name(dev), size, offset);
    > > + dev_printk(KERN_DEBUG, &dev->dev, "read %d bytes at 0x%x\n",
    > > + size, offset);
    >
    > Maybe then dev_dbg() ?

    It likely would be better to remove verbose_request altogether
    and just use dynamic debugging and dev_dbg for all the output.

    $ git grep -w -A3 verbose_request
    drivers/pci/xen-pcifront.c:static int verbose_request;
    drivers/pci/xen-pcifront.c:module_param(verbose_request, int, 0644);
    drivers/pci/xen-pcifront.c-
    drivers/pci/xen-pcifront.c-static int errno_to_pcibios_err(int errno)
    drivers/pci/xen-pcifront.c-{
    --
    drivers/pci/xen-pcifront.c: if (verbose_request)
    drivers/pci/xen-pcifront.c- dev_info(&pdev->xdev->dev,
    drivers/pci/xen-pcifront.c- "read dev=%04x:%02x:%02x.%d - offset %x size %d\n",
    drivers/pci/xen-pcifront.c- pci_domain_nr(bus), bus->number, PCI_SLOT(devfn),
    --
    drivers/pci/xen-pcifront.c: if (verbose_request)
    drivers/pci/xen-pcifront.c- dev_info(&pdev->xdev->dev, "read got back value %x\n",
    drivers/pci/xen-pcifront.c- op.value);
    drivers/pci/xen-pcifront.c-
    --
    drivers/pci/xen-pcifront.c: if (verbose_request)
    drivers/pci/xen-pcifront.c- dev_info(&pdev->xdev->dev,
    drivers/pci/xen-pcifront.c- "write dev=%04x:%02x:%02x.%d - "
    drivers/pci/xen-pcifront.c- "offset %x size %d val %x\n",
    --
    drivers/xen/xen-pciback/conf_space.c: if (unlikely(verbose_request))
    drivers/xen/xen-pciback/conf_space.c- printk(KERN_DEBUG DRV_NAME ": %s: read %d bytes at 0x%x\n",
    drivers/xen/xen-pciback/conf_space.c- pci_name(dev), size, offset);
    drivers/xen/xen-pciback/conf_space.c-
    --
    drivers/xen/xen-pciback/conf_space.c: if (unlikely(verbose_request))
    drivers/xen/xen-pciback/conf_space.c- printk(KERN_DEBUG DRV_NAME ": %s: read %d bytes at 0x%x = %x\n",
    drivers/xen/xen-pciback/conf_space.c- pci_name(dev), size, offset, value);
    drivers/xen/xen-pciback/conf_space.c-
    --
    drivers/xen/xen-pciback/conf_space.c: if (unlikely(verbose_request))
    drivers/xen/xen-pciback/conf_space.c- printk(KERN_DEBUG
    drivers/xen/xen-pciback/conf_space.c- DRV_NAME ": %s: write request %d bytes at 0x%x = %x\n",
    drivers/xen/xen-pciback/conf_space.c- pci_name(dev), size, offset, value);
    --
    drivers/xen/xen-pciback/conf_space_header.c: if (unlikely(verbose_request))
    drivers/xen/xen-pciback/conf_space_header.c- printk(KERN_DEBUG DRV_NAME ": %s: enable\n",
    drivers/xen/xen-pciback/conf_space_header.c- pci_name(dev));
    drivers/xen/xen-pciback/conf_space_header.c- err = pci_enable_device(dev);
    --
    drivers/xen/xen-pciback/conf_space_header.c: if (unlikely(verbose_request))
    drivers/xen/xen-pciback/conf_space_header.c- printk(KERN_DEBUG DRV_NAME ": %s: disable\n",
    drivers/xen/xen-pciback/conf_space_header.c- pci_name(dev));
    drivers/xen/xen-pciback/conf_space_header.c- pci_disable_device(dev);
    --
    drivers/xen/xen-pciback/conf_space_header.c: if (unlikely(verbose_request))
    drivers/xen/xen-pciback/conf_space_header.c- printk(KERN_DEBUG DRV_NAME ": %s: set bus master\n",
    drivers/xen/xen-pciback/conf_space_header.c- pci_name(dev));
    drivers/xen/xen-pciback/conf_space_header.c- pci_set_master(dev);
    --
    drivers/xen/xen-pciback/conf_space_header.c: if (unlikely(verbose_request))
    drivers/xen/xen-pciback/conf_space_header.c- printk(KERN_DEBUG DRV_NAME ": %s: clear bus master\n",
    drivers/xen/xen-pciback/conf_space_header.c- pci_name(dev));
    drivers/xen/xen-pciback/conf_space_header.c- pci_clear_master(dev);
    --
    drivers/xen/xen-pciback/conf_space_header.c: if (unlikely(verbose_request))
    drivers/xen/xen-pciback/conf_space_header.c- printk(KERN_DEBUG
    drivers/xen/xen-pciback/conf_space_header.c- DRV_NAME ": %s: enable memory-write-invalidate\n",
    drivers/xen/xen-pciback/conf_space_header.c- pci_name(dev));
    --
    drivers/xen/xen-pciback/conf_space_header.c: if (unlikely(verbose_request))
    drivers/xen/xen-pciback/conf_space_header.c- printk(KERN_DEBUG
    drivers/xen/xen-pciback/conf_space_header.c- DRV_NAME ": %s: disable memory-write-invalidate\n",
    drivers/xen/xen-pciback/conf_space_header.c- pci_name(dev));
    --
    drivers/xen/xen-pciback/pciback.h:extern int verbose_request;
    drivers/xen/xen-pciback/pciback.h-
    drivers/xen/xen-pciback/pciback.h-void xen_pcibk_test_and_schedule_op(struct xen_pcibk_device *pdev);
    drivers/xen/xen-pciback/pciback.h-#endif
    --
    drivers/xen/xen-pciback/pciback_ops.c:int verbose_request;
    drivers/xen/xen-pciback/pciback_ops.c:module_param(verbose_request, int, 0644);
    drivers/xen/xen-pciback/pciback_ops.c-
    drivers/xen/xen-pciback/pciback_ops.c-static irqreturn_t xen_pcibk_guest_interrupt(int irq, void *dev_id);
    drivers/xen/xen-pciback/pciback_ops.c-
    --
    drivers/xen/xen-pciback/pciback_ops.c: if (unlikely(verbose_request))
    drivers/xen/xen-pciback/pciback_ops.c- printk(KERN_DEBUG DRV_NAME ": %s: enable MSI\n", pci_name(dev));
    drivers/xen/xen-pciback/pciback_ops.c-
    drivers/xen/xen-pciback/pciback_ops.c- if (dev->msi_enabled)
    --
    drivers/xen/xen-pciback/pciback_ops.c: if (unlikely(verbose_request))
    drivers/xen/xen-pciback/pciback_ops.c- printk(KERN_DEBUG DRV_NAME ": %s: MSI: %d\n", pci_name(dev),
    drivers/xen/xen-pciback/pciback_ops.c- op->value);
    drivers/xen/xen-pciback/pciback_ops.c-
    --
    drivers/xen/xen-pciback/pciback_ops.c: if (unlikely(verbose_request))
    drivers/xen/xen-pciback/pciback_ops.c- printk(KERN_DEBUG DRV_NAME ": %s: disable MSI\n",
    drivers/xen/xen-pciback/pciback_ops.c- pci_name(dev));
    drivers/xen/xen-pciback/pciback_ops.c-
    --
    drivers/xen/xen-pciback/pciback_ops.c: if (unlikely(verbose_request))
    drivers/xen/xen-pciback/pciback_ops.c- printk(KERN_DEBUG DRV_NAME ": %s: MSI: %d\n", pci_name(dev),
    drivers/xen/xen-pciback/pciback_ops.c- op->value);
    drivers/xen/xen-pciback/pciback_ops.c- return 0;
    --
    drivers/xen/xen-pciback/pciback_ops.c: if (unlikely(verbose_request))
    drivers/xen/xen-pciback/pciback_ops.c- printk(KERN_DEBUG DRV_NAME ": %s: enable MSI-X\n",
    drivers/xen/xen-pciback/pciback_ops.c- pci_name(dev));
    drivers/xen/xen-pciback/pciback_ops.c-
    --
    drivers/xen/xen-pciback/pciback_ops.c: if (unlikely(verbose_request))
    drivers/xen/xen-pciback/pciback_ops.c- printk(KERN_DEBUG DRV_NAME ": %s: " \
    drivers/xen/xen-pciback/pciback_ops.c- "MSI-X[%d]: %d\n",
    drivers/xen/xen-pciback/pciback_ops.c- pci_name(dev), i,
    --
    drivers/xen/xen-pciback/pciback_ops.c: if (unlikely(verbose_request))
    drivers/xen/xen-pciback/pciback_ops.c- printk(KERN_DEBUG DRV_NAME ": %s: disable MSI-X\n",
    drivers/xen/xen-pciback/pciback_ops.c- pci_name(dev));
    drivers/xen/xen-pciback/pciback_ops.c-
    --
    drivers/xen/xen-pciback/pciback_ops.c: if (unlikely(verbose_request))
    drivers/xen/xen-pciback/pciback_ops.c- printk(KERN_DEBUG DRV_NAME ": %s: MSI-X: %d\n",
    drivers/xen/xen-pciback/pciback_ops.c- pci_name(dev), op->value);
    drivers/xen/xen-pciback/pciback_ops.c- return 0;


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