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git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
PCI: Add pci_rebar_get_max_size()
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
authored by
Ilpo Järvinen
and committed by
Bjorn Helgaas
1c680f2a
2987a64d
+24
+23
drivers/pci/rebar.c
+23
drivers/pci/rebar.c
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#include <linux/bits.h>
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#include <linux/bitfield.h>
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#include <linux/bitops.h>
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#include <linux/errno.h>
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#include <linux/export.h>
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#include <linux/ioport.h>
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return BIT(size) & sizes;
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}
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EXPORT_SYMBOL_GPL(pci_rebar_size_supported);
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/**
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* pci_rebar_get_max_size - get the maximum supported size of a BAR
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* @pdev: PCI device
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* @bar: BAR to query
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*
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* Get the largest supported size of a resizable BAR as a size.
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*
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* Return: the encoded maximum BAR size as defined in the PCIe spec
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* (0=1MB, 31=128TB), or %-NOENT on error.
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*/
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int pci_rebar_get_max_size(struct pci_dev *pdev, int bar)
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{
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u32 sizes;
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sizes = pci_rebar_get_possible_sizes(pdev, bar);
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if (!sizes)
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return -ENOENT;
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return __fls(sizes);
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}
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EXPORT_SYMBOL_GPL(pci_rebar_get_max_size);
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/**
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* pci_rebar_get_current_size - get the current size of a Resizable BAR
+1
include/linux/pci.h
+1
include/linux/pci.h
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resource_size_t pci_rebar_size_to_bytes(int size);
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u32 pci_rebar_get_possible_sizes(struct pci_dev *pdev, int bar);
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bool pci_rebar_size_supported(struct pci_dev *pdev, int bar, int size);
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int pci_rebar_get_max_size(struct pci_dev *pdev, int bar);
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int __must_check pci_resize_resource(struct pci_dev *dev, int i, int size,
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int exclude_bars);
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