Users of pci_resize_resource() need a way to calculate bar size from desired bytes. Add a helper function and export it so that modular drivers can use it.
Signed-off-by: Darren Salt devspam@moreofthesa.me.uk Signed-off-by: Christian König christian.koenig@amd.com Signed-off-by: Nirmoy Das nirmoy.das@amd.com --- drivers/pci/pci.c | 2 +- include/linux/pci.h | 6 ++++++ 2 files changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index ef80ed451415..16216186b51c 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -1648,7 +1648,7 @@ static void pci_restore_rebar_state(struct pci_dev *pdev) pci_read_config_dword(pdev, pos + PCI_REBAR_CTRL, &ctrl); bar_idx = ctrl & PCI_REBAR_CTRL_BAR_IDX; res = pdev->resource + bar_idx; - size = ilog2(resource_size(res)) - 20; + size = pci_rebar_bytes_to_size(resource_size(res)); ctrl &= ~PCI_REBAR_CTRL_BAR_SIZE; ctrl |= size << PCI_REBAR_CTRL_BAR_SHIFT; pci_write_config_dword(pdev, pos + PCI_REBAR_CTRL, ctrl); diff --git a/include/linux/pci.h b/include/linux/pci.h index 9999040cfad9..77fed01523e0 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -1226,6 +1226,12 @@ void pci_update_resource(struct pci_dev *dev, int resno); int __must_check pci_assign_resource(struct pci_dev *dev, int i); int __must_check pci_reassign_resource(struct pci_dev *dev, int i, resource_size_t add_size, resource_size_t align); void pci_release_resource(struct pci_dev *dev, int resno); +static inline int pci_rebar_bytes_to_size(u64 bytes) +{ + bytes = roundup_pow_of_two(bytes); + return max(ilog2(bytes), 20) - 20; +} + 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 pci_select_bars(struct pci_dev *dev, unsigned long flags);