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PCI: Add pci_rebar_get_max_size()

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Add pci_rebar_get_max_size() to allow simplifying code that wants to know
the maximum possible size for a Resizable BAR.

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/20251113180053.27944-9-ilpo.jarvinen@linux.intel.com
This commit is contained in:
Ilpo Järvinen
2025-11-13 20:00:50 +02:00
committed by Bjorn Helgaas
parent 2987a64de3
commit 1c680f2acd
2 changed files with 24 additions and 0 deletions
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23
drivers/pci/rebar.c
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@@ -5,6 +5,7 @@
#include <linux/bits.h>
#include <linux/bitfield.h>
#include <linux/bitops.h>
#include <linux/errno.h>
#include <linux/export.h>
#include <linux/ioport.h>
@@ -142,6 +143,28 @@ bool pci_rebar_size_supported(struct pci_dev *pdev, int bar, int size)
}
EXPORT_SYMBOL_GPL(pci_rebar_size_supported);
/**
* pci_rebar_get_max_size - get the maximum supported size of a BAR
* @pdev: PCI device
* @bar: BAR to query
*
* Get the largest supported size of a resizable BAR as a size.
*
* Return: the encoded maximum BAR size as defined in the PCIe spec
* (0=1MB, 31=128TB), or %-NOENT on error.
*/
int pci_rebar_get_max_size(struct pci_dev *pdev, int bar)
{
u32 sizes;
sizes = pci_rebar_get_possible_sizes(pdev, bar);
if (!sizes)
return -ENOENT;
return __fls(sizes);
}
EXPORT_SYMBOL_GPL(pci_rebar_get_max_size);
/**
* pci_rebar_get_current_size - get the current size of a Resizable BAR
* @pdev: PCI device

1
include/linux/pci.h
View File

@@ -1425,6 +1425,7 @@ 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);
bool pci_rebar_size_supported(struct pci_dev *pdev, int bar, int size);
int pci_rebar_get_max_size(struct pci_dev *pdev, int bar);
int __must_check pci_resize_resource(struct pci_dev *dev, int i, int size,
int exclude_bars);