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PCI: Move pci_rebar_size_to_bytes() and export it

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pci_rebar_size_to_bytes() is in drivers/pci/pci.h but would be useful for
endpoint drivers as well.

Move the function to rebar.c and export it.

In addition, convert the literal to where the number comes from
(PCI_REBAR_MIN_SIZE).

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Link: https://patch.msgid.link/20251113180053.27944-4-ilpo.jarvinen@linux.intel.com
This commit is contained in:
Ilpo Järvinen
2025-11-13 20:00:45 +02:00
committed by Bjorn Helgaas
parent 876e15943e
commit a337869885
3 changed files with 13 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/pci/pci.h
View File

@@ -1024,10 +1024,6 @@ void pci_rebar_init(struct pci_dev *pdev);
void pci_restore_rebar_state(struct pci_dev *pdev);
int pci_rebar_get_current_size(struct pci_dev *pdev, int bar);
int pci_rebar_set_size(struct pci_dev *pdev, int bar, int size);
static inline u64 pci_rebar_size_to_bytes(int size)
{
return 1ULL << (size + 20);
}
struct device_node;

12
drivers/pci/rebar.c
View File

@@ -35,6 +35,18 @@ int pci_rebar_bytes_to_size(u64 bytes)
}
EXPORT_SYMBOL_GPL(pci_rebar_bytes_to_size);
/**
* pci_rebar_size_to_bytes - Convert encoded BAR Size to size in bytes
* @size: encoded BAR Size as defined in the PCIe spec (0=1MB, 31=128TB)
*
* Return: BAR size in bytes
*/
resource_size_t pci_rebar_size_to_bytes(int size)
{
return 1ULL << (size + ilog2(PCI_REBAR_MIN_SIZE));
}
EXPORT_SYMBOL_GPL(pci_rebar_size_to_bytes);
void pci_rebar_init(struct pci_dev *pdev)
{
pdev->rebar_cap = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_REBAR);

1
include/linux/pci.h
View File

@@ -1422,6 +1422,7 @@ int pci_release_resource(struct pci_dev *dev, int resno);
/* Resizable BAR related routines */
int pci_rebar_bytes_to_size(u64 bytes);
resource_size_t pci_rebar_size_to_bytes(int size);
u32 pci_rebar_get_possible_sizes(struct pci_dev *pdev, int bar);
int __must_check pci_resize_resource(struct pci_dev *dev, int i, int size,
int exclude_bars);