@@ -1007,3 +1007,47 @@ void pcim_iounmap_regions(struct pci_dev *pdev, int mask)
}
}
EXPORT_SYMBOL(pcim_iounmap_regions);
+
+/**
+ * pcim_iomap_range - Create a ranged __iomap mapping within a PCI BAR
+ * @pdev: PCI device to map IO resources for
+ * @bar: Index of the BAR
+ * @offset: Offset from the begin of the BAR
+ * @len: Length in bytes for the mapping
+ *
+ * Returns: __iomem pointer on success, an IOMEM_ERR_PTR on failure.
+ *
+ * Creates a new IO-Mapping within the specified @bar, ranging from @offset to
+ * @offset + @len.
+ *
+ * The mapping will automatically get unmapped on driver detach. If desired,
+ * release manually only with pcim_iounmap().
+ */
+void __iomem *pcim_iomap_range(struct pci_dev *pdev, int bar,
+ unsigned long offset, unsigned long len)
+{
+ void __iomem *mapping;
+ struct pcim_addr_devres *res;
+
+ res = pcim_addr_devres_alloc(pdev);
+ if (!res)
+ return IOMEM_ERR_PTR(-ENOMEM);
+
+ mapping = pci_iomap_range(pdev, bar, offset, len);
+ if (!mapping) {
+ pcim_addr_devres_free(res);
+ return IOMEM_ERR_PTR(-EINVAL);
+ }
+
+ res->type = PCIM_ADDR_DEVRES_TYPE_MAPPING;
+ res->baseaddr = mapping;
+
+ /*
+ * Ranged mappings don't get added to the legacy-table, since the table
+ * only ever keeps track of whole BARs.
+ */
+
+ devres_add(&pdev->dev, res);
+ return mapping;
+}
+EXPORT_SYMBOL(pcim_iomap_range);
@@ -2329,6 +2329,8 @@ int pcim_iomap_regions(struct pci_dev *pdev, int mask, const char *name);
int pcim_iomap_regions_request_all(struct pci_dev *pdev, int mask,
const char *name);
void pcim_iounmap_regions(struct pci_dev *pdev, int mask);
+void __iomem *pcim_iomap_range(struct pci_dev *pdev, int bar,
+ unsigned long offset, unsigned long len);
extern int pci_pci_problems;
#define PCIPCI_FAIL 1 /* No PCI PCI DMA */
The only managed mapping function currently is pcim_iomap() which doesn't allow for mapping an area starting at a certain offset, which many drivers want. Add pcim_iomap_range() as an exported function. Signed-off-by: Philipp Stanner <pstanner@redhat.com> --- drivers/pci/devres.c | 44 ++++++++++++++++++++++++++++++++++++++++++++ include/linux/pci.h | 2 ++ 2 files changed, 46 insertions(+)