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Merge branch 'pci/resource'

Browse source 
- Refactor pci_ioremap_bar() and pci_ioremap_wc_bar() (Krzysztof
  Wilczyński)

- Optimize pci_resource_len() to reduce kernel size (Zhen Lei)

* pci/resource:
  PCI: Optimize pci_resource_len() to reduce kernel size
  PCI: Refactor pci_ioremap_bar() and pci_ioremap_wc_bar()
This commit is contained in:
Bjorn Helgaas 2021-09-02 14:56:43 -05:00
commit 9045f63e67
2 changed files with 17 additions and 15 deletions
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28
drivers/pci/pci.c
View file

@ -212,32 +212,36 @@ int pci_status_get_and_clear_errors(struct pci_dev *pdev)
EXPORT_SYMBOL_GPL(pci_status_get_and_clear_errors);
#ifdef CONFIG_HAS_IOMEM
void __iomem *pci_ioremap_bar(struct pci_dev *pdev, int bar)
static void __iomem *__pci_ioremap_resource(struct pci_dev *pdev, int bar,
bool write_combine)
{
struct resource *res = &pdev->resource[bar];
resource_size_t start = res->start;
resource_size_t size = resource_size(res);
/*
* Make sure the BAR is actually a memory resource, not an IO resource
*/
if (res->flags & IORESOURCE_UNSET || !(res->flags & IORESOURCE_MEM)) {
pci_warn(pdev, "can't ioremap BAR %d: %pR\n", bar, res);
pci_err(pdev, "can't ioremap BAR %d: %pR\n", bar, res);
return NULL;
}
return ioremap(res->start, resource_size(res));
if (write_combine)
return ioremap_wc(start, size);
return ioremap(start, size);
}
void __iomem *pci_ioremap_bar(struct pci_dev *pdev, int bar)
{
return __pci_ioremap_resource(pdev, bar, false);
}
EXPORT_SYMBOL_GPL(pci_ioremap_bar);
void __iomem *pci_ioremap_wc_bar(struct pci_dev *pdev, int bar)
{
/*
* Make sure the BAR is actually a memory resource, not an IO resource
*/
if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM)) {
WARN_ON(1);
return NULL;
}
return ioremap_wc(pci_resource_start(pdev, bar),
pci_resource_len(pdev, bar));
return __pci_ioremap_resource(pdev, bar, true);
}
EXPORT_SYMBOL_GPL(pci_ioremap_wc_bar);
#endif

4
include/linux/pci.h
View file

@ -1891,9 +1891,7 @@ int pci_iobar_pfn(struct pci_dev *pdev, int bar, struct vm_area_struct *vma);
#define pci_resource_end(dev, bar) ((dev)->resource[(bar)].end)
#define pci_resource_flags(dev, bar) ((dev)->resource[(bar)].flags)
#define pci_resource_len(dev,bar) \
((pci_resource_start((dev), (bar)) == 0 && \
pci_resource_end((dev), (bar)) == \
pci_resource_start((dev), (bar))) ? 0 : \
((pci_resource_end((dev), (bar)) == 0) ? 0 : \
\
(pci_resource_end((dev), (bar)) - \
pci_resource_start((dev), (bar)) + 1))