From 535bdbeaacf96a8c4ef8d726382fb8fae97f168f Mon Sep 17 00:00:00 2001 From: =?utf8?q?Micha=C5=82=20Winiarski?= Date: Wed, 2 Jul 2025 11:35:19 +0200 Subject: [PATCH] PCI/IOV: Add pci_resource_num_to_vf_bar() to convert VF BAR number to/from IOV resource MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit There are multiple places where conversions between IOV resources and corresponding VF BAR numbers are done. Extract the logic to pci_resource_num_from_vf_bar() and pci_resource_num_to_vf_bar() helpers. Suggested-by: Ilpo Järvinen Signed-off-by: Michał Winiarski Signed-off-by: Bjorn Helgaas Reviewed-by: Ilpo Järvinen Acked-by: Christian König Link: https://patch.msgid.link/20250702093522.518099-3-michal.winiarski@intel.com --- drivers/pci/iov.c | 26 ++++++++++++++++---------- drivers/pci/pci.h | 18 ++++++++++++++++++ drivers/pci/setup-bus.c | 3 ++- 3 files changed, 36 insertions(+), 11 deletions(-) diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c index 10ccef8afe145..bdac078045525 100644 --- a/drivers/pci/iov.c +++ b/drivers/pci/iov.c @@ -151,7 +151,7 @@ resource_size_t pci_iov_resource_size(struct pci_dev *dev, int resno) if (!dev->is_physfn) return 0; - return dev->sriov->barsz[resno - PCI_IOV_RESOURCES]; + return dev->sriov->barsz[pci_resource_num_to_vf_bar(resno)]; } static void pci_read_vf_config_common(struct pci_dev *virtfn) @@ -342,12 +342,14 @@ int pci_iov_add_virtfn(struct pci_dev *dev, int id) virtfn->multifunction = 0; for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { - res = &dev->resource[i + PCI_IOV_RESOURCES]; + int idx = pci_resource_num_from_vf_bar(i); + + res = &dev->resource[idx]; if (!res->parent) continue; virtfn->resource[i].name = pci_name(virtfn); virtfn->resource[i].flags = res->flags; - size = pci_iov_resource_size(dev, i + PCI_IOV_RESOURCES); + size = pci_iov_resource_size(dev, idx); resource_set_range(&virtfn->resource[i], res->start + size * id, size); rc = request_resource(res, &virtfn->resource[i]); @@ -644,8 +646,10 @@ static int sriov_enable(struct pci_dev *dev, int nr_virtfn) nres = 0; for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { - bars |= (1 << (i + PCI_IOV_RESOURCES)); - res = &dev->resource[i + PCI_IOV_RESOURCES]; + int idx = pci_resource_num_from_vf_bar(i); + + bars |= (1 << idx); + res = &dev->resource[idx]; if (res->parent) nres++; } @@ -811,8 +815,10 @@ found: nres = 0; for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { - res = &dev->resource[i + PCI_IOV_RESOURCES]; - res_name = pci_resource_name(dev, i + PCI_IOV_RESOURCES); + int idx = pci_resource_num_from_vf_bar(i); + + res = &dev->resource[idx]; + res_name = pci_resource_name(dev, idx); /* * If it is already FIXED, don't change it, something @@ -871,7 +877,7 @@ fail_max_buses: dev->is_physfn = 0; failed: for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { - res = &dev->resource[i + PCI_IOV_RESOURCES]; + res = &dev->resource[pci_resource_num_from_vf_bar(i)]; res->flags = 0; } @@ -933,7 +939,7 @@ static void sriov_restore_state(struct pci_dev *dev) pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, ctrl); for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) - pci_update_resource(dev, i + PCI_IOV_RESOURCES); + pci_update_resource(dev, pci_resource_num_from_vf_bar(i)); pci_write_config_dword(dev, iov->pos + PCI_SRIOV_SYS_PGSIZE, iov->pgsz); pci_iov_set_numvfs(dev, iov->num_VFs); @@ -999,7 +1005,7 @@ void pci_iov_update_resource(struct pci_dev *dev, int resno) { struct pci_sriov *iov = dev->is_physfn ? dev->sriov : NULL; struct resource *res = pci_resource_n(dev, resno); - int vf_bar = resno - PCI_IOV_RESOURCES; + int vf_bar = pci_resource_num_to_vf_bar(resno); struct pci_bus_region region; u16 cmd; u32 new; diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index 69258c445b288..190e4c115014e 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -722,6 +722,14 @@ static inline bool pci_resource_is_iov(int resno) { return resno >= PCI_IOV_RESOURCES && resno <= PCI_IOV_RESOURCE_END; } +static inline int pci_resource_num_from_vf_bar(int resno) +{ + return resno + PCI_IOV_RESOURCES; +} +static inline int pci_resource_num_to_vf_bar(int resno) +{ + return resno - PCI_IOV_RESOURCES; +} extern const struct attribute_group sriov_pf_dev_attr_group; extern const struct attribute_group sriov_vf_dev_attr_group; #else @@ -750,6 +758,16 @@ static inline bool pci_resource_is_iov(int resno) { return false; } +static inline int pci_resource_num_from_vf_bar(int resno) +{ + WARN_ON_ONCE(1); + return -ENODEV; +} +static inline int pci_resource_num_to_vf_bar(int resno) +{ + WARN_ON_ONCE(1); + return -ENODEV; +} #endif /* CONFIG_PCI_IOV */ #ifdef CONFIG_PCIE_TPH diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c index 07c3d021a47ec..7853ac6999e2c 100644 --- a/drivers/pci/setup-bus.c +++ b/drivers/pci/setup-bus.c @@ -1888,7 +1888,8 @@ static int iov_resources_unassigned(struct pci_dev *dev, void *data) bool *unassigned = data; for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { - struct resource *r = &dev->resource[i + PCI_IOV_RESOURCES]; + int idx = pci_resource_num_from_vf_bar(i); + struct resource *r = &dev->resource[idx]; struct pci_bus_region region; /* Not assigned or rejected by kernel? */ -- 2.47.2