diff options
| -rw-r--r-- | drivers/pci/iov.c | 73 | ||||
| -rw-r--r-- | include/linux/pci.h | 6 |
2 files changed, 79 insertions, 0 deletions
diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c index f34173c70b32..ac4375954c94 100644 --- a/drivers/pci/iov.c +++ b/drivers/pci/iov.c @@ -8,11 +8,15 @@ */ #include <linux/bitfield.h> +#include <linux/bits.h> +#include <linux/log2.h> #include <linux/pci.h> +#include <linux/sizes.h> #include <linux/slab.h> #include <linux/export.h> #include <linux/string.h> #include <linux/delay.h> +#include <asm/div64.h> #include "pci.h" #define VIRTFN_ID_LEN 17 /* "virtfn%u\0" for 2^32 - 1 */ @@ -1313,3 +1317,72 @@ 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. + * + * Return: 0 on success, or negative on failure. + */ +int pci_iov_vf_bar_set_size(struct pci_dev *dev, int resno, int size) +{ + u32 sizes; + int ret; + + 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 accommodate @num_vfs within + * the currently assigned size of the resource @resno. + * + * Return: A bitmask of sizes 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) +{ + u64 vf_len = pci_resource_len(dev, resno); + u32 sizes; + + if (!num_vfs) + return 0; + + do_div(vf_len, num_vfs); + sizes = (roundup_pow_of_two(vf_len + 1) - 1) >> ilog2(SZ_1M); + + return sizes & pci_rebar_get_possible_sizes(dev, resno); +} +EXPORT_SYMBOL_GPL(pci_iov_vf_bar_get_sizes); diff --git a/include/linux/pci.h b/include/linux/pci.h index 05e68f35f392..28f06045ab20 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -2438,6 +2438,8 @@ 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) */ @@ -2490,6 +2492,10 @@ 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 |