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Add a pci_iov_vf_bar_set_size() function to control the size and a pci_iov_vf_bar_get_sizes() helper to get the VF BAR sizes that will allow up to num_vfs to be successfully enabled with the current underlying reservation size. Signed-off-by: Michał Winiarski --- drivers/pci/iov.c | 78 +++++++++++++++++++++++++++++++++++++++++++++ include/linux/pci.h | 6 ++++ 2 files changed, 84 insertions(+) diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c index d6d63083884e6..76846df2a26d8 100644 --- a/drivers/pci/iov.c +++ b/drivers/pci/iov.c @@ -1290,3 +1290,81 @@ int pci_sriov_configure_simple(struct pci_dev *dev, int nr_virtfn) return nr_virtfn; } EXPORT_SYMBOL_GPL(pci_sriov_configure_simple); + +/** + * pci_iov_vf_bar_set_size - set a new size for a VF BAR + * @dev: the PCI device + * @resno: the resource number + * @size: new size as defined in the spec (0=1MB, 31=128TB) + * + * Set the new size of a VF BAR that supports VF resizable BAR capability. + * Unlike pci_resize_resource(), this does not cause the resource that + * reserves the MMIO space (originally up to total_VFs) to be resized, which + * means that following calls to pci_enable_sriov() can fail if the resources + * no longer fit. + * + * Returns 0 on success, or negative on failure. + */ +int pci_iov_vf_bar_set_size(struct pci_dev *dev, int resno, int size) +{ + int ret; + u32 sizes; + + if (!pci_resource_is_iov(resno)) + return -EINVAL; + + if (pci_iov_is_memory_decoding_enabled(dev)) + return -EBUSY; + + sizes = pci_rebar_get_possible_sizes(dev, resno); + if (!sizes) + return -ENOTSUPP; + + if (!(sizes & BIT(size))) + return -EINVAL; + + ret = pci_rebar_set_size(dev, resno, size); + if (ret) + return ret; + + pci_iov_resource_set_size(dev, resno, pci_rebar_size_to_bytes(size)); + + return 0; +} +EXPORT_SYMBOL_GPL(pci_iov_vf_bar_set_size); + +/** + * pci_iov_vf_bar_get_sizes - get VF BAR sizes allowing to create up to num_vfs + * @dev: the PCI device + * @resno: the resource number + * @num_vfs: number of VFs + * + * Get the sizes of a VF resizable BAR that can be accommodated within the + * resource that reserves the MMIO space if num_vfs are enabled. + * + * Returns 0 if BAR isn't resizable, otherwise returns a bitmask in format + * defined in the spec (bit 0=1MB, bit 31=128TB). + */ +u32 pci_iov_vf_bar_get_sizes(struct pci_dev *dev, int resno, int num_vfs) +{ + resource_size_t size; + u32 sizes; + int i; + + sizes = pci_rebar_get_possible_sizes(dev, resno); + if (!sizes) + return 0; + + while (sizes > 0) { + i = __fls(sizes); + size = pci_rebar_size_to_bytes(i); + + if (size * num_vfs <= pci_resource_len(dev, resno)) + break; + + sizes &= ~BIT(i); + } + + return sizes; +} +EXPORT_SYMBOL_GPL(pci_iov_vf_bar_get_sizes); diff --git a/include/linux/pci.h b/include/linux/pci.h index 7192b9d78d7e3..76de900c652f8 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -2393,6 +2393,8 @@ int pci_sriov_set_totalvfs(struct pci_dev *dev, u16 numvfs); int pci_sriov_get_totalvfs(struct pci_dev *dev); int pci_sriov_configure_simple(struct pci_dev *dev, int nr_virtfn); resource_size_t pci_iov_resource_size(struct pci_dev *dev, int resno); +int pci_iov_vf_bar_set_size(struct pci_dev *dev, int resno, int size); +u32 pci_iov_vf_bar_get_sizes(struct pci_dev *dev, int resno, int num_vfs); void pci_vf_drivers_autoprobe(struct pci_dev *dev, bool probe); /* Arch may override these (weak) */ @@ -2445,6 +2447,10 @@ static inline int pci_sriov_get_totalvfs(struct pci_dev *dev) #define pci_sriov_configure_simple NULL static inline resource_size_t pci_iov_resource_size(struct pci_dev *dev, int resno) { return 0; } +static inline int pci_iov_vf_bar_set_size(struct pci_dev *dev, int resno, int size) +{ return -ENODEV; } +static inline u32 pci_iov_vf_bar_get_sizes(struct pci_dev *dev, int resno, int num_vfs) +{ return 0; } static inline void pci_vf_drivers_autoprobe(struct pci_dev *dev, bool probe) { } #endif