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PCI: Add devres helpers for iomap table

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The pcim_iomap_devres.table administrated by pcim_iomap_table() has its
entries set and unset at several places throughout devres.c using manual
iterations which are effectively code duplications.

Add pcim_add_mapping_to_legacy_table() and
pcim_remove_mapping_from_legacy_table() helper functions and use them where
possible.

Link: https://lore.kernel.org/r/20240613115032.29098-3-pstanner@redhat.com
Signed-off-by: Philipp Stanner <pstanner@redhat.com>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Philipp Stanner 2024-06-13 13:50:15 +02:00 committed by Krzysztof Wilczyński
parent dee37e90b4
commit d5fe8207d8
No known key found for this signature in database
GPG Key ID: 7C64768D3DE334E7
1 changed files with 58 additions and 19 deletions
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77
drivers/pci/devres.c
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@ -297,6 +297,52 @@ void __iomem * const *pcim_iomap_table(struct pci_dev *pdev)
} }
EXPORT_SYMBOL(pcim_iomap_table); EXPORT_SYMBOL(pcim_iomap_table);
/*
* Fill the legacy mapping-table, so that drivers using the old API can
* still get a BAR's mapping address through pcim_iomap_table().
*/
static int pcim_add_mapping_to_legacy_table(struct pci_dev *pdev,
void __iomem *mapping, int bar)
{
void __iomem **legacy_iomap_table;
if (bar >= PCI_STD_NUM_BARS)
return -EINVAL;
legacy_iomap_table = (void __iomem **)pcim_iomap_table(pdev);
if (!legacy_iomap_table)
return -ENOMEM;
/* The legacy mechanism doesn't allow for duplicate mappings. */
WARN_ON(legacy_iomap_table[bar]);
legacy_iomap_table[bar] = mapping;
return 0;
}
/*
* Remove a mapping. The table only contains whole-BAR mappings, so this will
* never interfere with ranged mappings.
*/
static void pcim_remove_mapping_from_legacy_table(struct pci_dev *pdev,
void __iomem *addr)
{
int bar;
void __iomem **legacy_iomap_table;
legacy_iomap_table = (void __iomem **)pcim_iomap_table(pdev);
if (!legacy_iomap_table)
return;
for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) {
if (legacy_iomap_table[bar] == addr) {
legacy_iomap_table[bar] = NULL;
return;
}
}
}
/** /**
* pcim_iomap - Managed pcim_iomap() * pcim_iomap - Managed pcim_iomap()
* @pdev: PCI device to iomap for * @pdev: PCI device to iomap for
@ -308,16 +354,20 @@ EXPORT_SYMBOL(pcim_iomap_table);
*/ */
void __iomem *pcim_iomap(struct pci_dev *pdev, int bar, unsigned long maxlen) void __iomem *pcim_iomap(struct pci_dev *pdev, int bar, unsigned long maxlen)
{ {
void __iomem **tbl; void __iomem *mapping;
BUG_ON(bar >= PCIM_IOMAP_MAX); mapping = pci_iomap(pdev, bar, maxlen);
if (!mapping)
tbl = (void __iomem **)pcim_iomap_table(pdev);
if (!tbl || tbl[bar]) /* duplicate mappings not allowed */
return NULL; return NULL;
tbl[bar] = pci_iomap(pdev, bar, maxlen); if (pcim_add_mapping_to_legacy_table(pdev, mapping, bar) != 0)
return tbl[bar]; goto err_table;
return mapping;
err_table:
pci_iounmap(pdev, mapping);
return NULL;
} }
EXPORT_SYMBOL(pcim_iomap); EXPORT_SYMBOL(pcim_iomap);
@ -330,20 +380,9 @@ EXPORT_SYMBOL(pcim_iomap);
*/ */
void pcim_iounmap(struct pci_dev *pdev, void __iomem *addr) void pcim_iounmap(struct pci_dev *pdev, void __iomem *addr)
{ {
void __iomem **tbl;
int i;
pci_iounmap(pdev, addr); pci_iounmap(pdev, addr);
tbl = (void __iomem **)pcim_iomap_table(pdev); pcim_remove_mapping_from_legacy_table(pdev, addr);
BUG_ON(!tbl);
for (i = 0; i < PCIM_IOMAP_MAX; i++)
if (tbl[i] == addr) {
tbl[i] = NULL;
return;
}
WARN_ON(1);
} }
EXPORT_SYMBOL(pcim_iounmap); EXPORT_SYMBOL(pcim_iounmap);