From: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Date: Thu, 13 Nov 2025 18:00:45 +0000 (+0200)
Subject: PCI: Move pci_rebar_size_to_bytes() and export it
X-Git-Tag: v6.19-rc1~135^2~21^2~9
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a337869885083131e575c6367c679f4da4b68bb0;p=thirdparty%2Fkernel%2Flinux.git

PCI: Move pci_rebar_size_to_bytes() and export it

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
---

diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 41df359206325..a1e7dbeb0f2cc 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -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;
 
diff --git a/drivers/pci/rebar.c b/drivers/pci/rebar.c
index f29810fe0a584..a81cb3fcddefd 100644
--- a/drivers/pci/rebar.c
+++ b/drivers/pci/rebar.c
@@ -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);
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 628dda63b9e09..33b27e0c4f3e7 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -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);