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The structures are very similar, which means we can reuse most of the implementation. Extend the pci_resize_resource() function to accept IOV resources. See PCIe r4.0, sec 9.3.7.4. Signed-off-by: Michał Winiarski --- drivers/pci/iov.c | 21 +++++++++++++++++++++ drivers/pci/pci.c | 10 +++++++++- drivers/pci/pci.h | 10 +++++++++- drivers/pci/setup-res.c | 36 +++++++++++++++++++++++++++++++----- 4 files changed, 70 insertions(+), 7 deletions(-) diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c index eedc1df56c49e..79143c1bc7bb4 100644 --- a/drivers/pci/iov.c +++ b/drivers/pci/iov.c @@ -154,6 +154,27 @@ resource_size_t pci_iov_resource_size(struct pci_dev *dev, int resno) return dev->sriov->barsz[pci_resource_from_iov(resno)]; } +void pci_iov_resource_set_size(struct pci_dev *dev, int resno, + resource_size_t size) +{ + if (!pci_resource_is_iov(resno)) { + pci_warn(dev, "%s is not an IOV resource\n", + pci_resource_name(dev, resno)); + return; + } + + dev->sriov->barsz[pci_resource_from_iov(resno)] = size; +} + +bool pci_iov_is_memory_decoding_enabled(struct pci_dev *dev) +{ + u16 cmd; + + pci_read_config_word(dev, dev->sriov->pos + PCI_SRIOV_CTRL, &cmd); + + return cmd & PCI_SRIOV_CTRL_MSE; +} + static void pci_read_vf_config_common(struct pci_dev *virtfn) { struct pci_dev *physfn = virtfn->physfn; diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 7d85c04fbba2a..905a533807b32 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -3720,8 +3720,16 @@ static int pci_rebar_find_pos(struct pci_dev *pdev, int bar) { unsigned int pos, nbars, i; u32 ctrl; + int cap; - pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_REBAR); + if (pci_resource_is_iov(bar)) { + cap = PCI_EXT_CAP_ID_VF_REBAR; + bar = pci_resource_from_iov(bar); + } else { + cap = PCI_EXT_CAP_ID_REBAR; + } + + pos = pci_find_ext_capability(pdev, cap); if (!pos) return -ENOTSUPP; diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index 1f8d88f0243b7..4347858007145 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -580,6 +580,9 @@ void pci_iov_update_resource(struct pci_dev *dev, int resno); resource_size_t pci_sriov_resource_alignment(struct pci_dev *dev, int resno); void pci_restore_iov_state(struct pci_dev *dev); int pci_iov_bus_range(struct pci_bus *bus); +void pci_iov_resource_set_size(struct pci_dev *dev, int resno, + resource_size_t size); +bool pci_iov_is_memory_decoding_enabled(struct pci_dev *dev); static inline bool pci_resource_is_iov(int resno) { return resno >= PCI_IOV_RESOURCES && resno <= PCI_IOV_RESOURCE_END; @@ -613,6 +616,12 @@ static inline int pci_iov_bus_range(struct pci_bus *bus) { return 0; } +static inline void pci_iov_resource_set_size(struct pci_dev *dev, int resno, + resource_size_t size) { } +static inline bool pci_iov_is_memory_decoding_enabled(struct pci_dev *dev) +{ + return false; +} static inline bool pci_resource_is_iov(int resno) { return false; @@ -621,7 +630,6 @@ static inline int pci_resource_to_iov(int resno) { return -ENODEV; } - static inline int pci_resource_from_iov(int resno) { return -ENODEV; diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c index e2cf79253ebda..cec8f684b7c70 100644 --- a/drivers/pci/setup-res.c +++ b/drivers/pci/setup-res.c @@ -425,13 +425,40 @@ void pci_release_resource(struct pci_dev *dev, int resno) } EXPORT_SYMBOL(pci_release_resource); +static bool pci_resize_is_memory_decoding_enabled(struct pci_dev *dev, + int resno) +{ + u16 cmd; + + if (pci_resource_is_iov(resno)) + return pci_iov_is_memory_decoding_enabled(dev); + + pci_read_config_word(dev, PCI_COMMAND, &cmd); + + return cmd & PCI_COMMAND_MEMORY; +} + +static void pci_resize_resource_set_size(struct pci_dev *dev, int resno, + int size) +{ + resource_size_t res_size = pci_rebar_size_to_bytes(size); + struct resource *res = dev->resource + resno; + + if (!pci_resource_is_iov(resno)) { + res->end = res->start + res_size - 1; + } else { + res->end = res->start + + res_size * pci_sriov_get_totalvfs(dev) - 1; + pci_iov_resource_set_size(dev, resno, res_size); + } +} + int pci_resize_resource(struct pci_dev *dev, int resno, int size) { struct resource *res = dev->resource + resno; struct pci_host_bridge *host; int old, ret; u32 sizes; - u16 cmd; /* Check if we must preserve the firmware's resource assignment */ host = pci_find_host_bridge(dev->bus); @@ -442,8 +469,7 @@ int pci_resize_resource(struct pci_dev *dev, int resno, int size) if (!(res->flags & IORESOURCE_UNSET)) return -EBUSY; - pci_read_config_word(dev, PCI_COMMAND, &cmd); - if (cmd & PCI_COMMAND_MEMORY) + if (pci_resize_is_memory_decoding_enabled(dev, resno)) return -EBUSY; sizes = pci_rebar_get_possible_sizes(dev, resno); @@ -461,7 +487,7 @@ int pci_resize_resource(struct pci_dev *dev, int resno, int size) if (ret) return ret; - res->end = res->start + pci_rebar_size_to_bytes(size) - 1; + pci_resize_resource_set_size(dev, resno, size); /* Check if the new config works by trying to assign everything. */ if (dev->bus->self) { @@ -473,7 +499,7 @@ int pci_resize_resource(struct pci_dev *dev, int resno, int size) error_resize: pci_rebar_set_size(dev, resno, old); - res->end = res->start + pci_rebar_size_to_bytes(old) - 1; + pci_resize_resource_set_size(dev, resno, old); return ret; } EXPORT_SYMBOL(pci_resize_resource);