From: Bjorn Helgaas Date: Fri, 17 Mar 2017 00:48:22 +0000 (+0000) Subject: PCI: Separate VF BAR updates from standard BAR updates X-Git-Tag: v4.9.17~41 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=6a5f3e664ac798b54448fc55e7e7c3a9fd1ee9d4;p=platform%2Fkernel%2Flinux-amlogic.git PCI: Separate VF BAR updates from standard BAR updates [ Upstream commit 6ffa2489c51da77564a0881a73765ea2169f955d ] Previously pci_update_resource() used the same code path for updating standard BARs and VF BARs in SR-IOV capabilities. Split the VF BAR update into a new pci_iov_update_resource() internal interface, which makes it simpler to compute the BAR address (we can get rid of pci_resource_bar() and pci_iov_resource_bar()). This patch: - Renames pci_update_resource() to pci_std_update_resource(), - Adds pci_iov_update_resource(), - Makes pci_update_resource() a wrapper that calls the appropriate one, No functional change intended. Signed-off-by: Bjorn Helgaas Reviewed-by: Gavin Shan Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c index e30f05c..39888cf 100644 --- a/drivers/pci/iov.c +++ b/drivers/pci/iov.c @@ -571,6 +571,56 @@ int pci_iov_resource_bar(struct pci_dev *dev, int resno) 4 * (resno - PCI_IOV_RESOURCES); } +/** + * pci_iov_update_resource - update a VF BAR + * @dev: the PCI device + * @resno: the resource number + * + * Update a VF BAR in the SR-IOV capability of a PF. + */ +void pci_iov_update_resource(struct pci_dev *dev, int resno) +{ + struct pci_sriov *iov = dev->is_physfn ? dev->sriov : NULL; + struct resource *res = dev->resource + resno; + int vf_bar = resno - PCI_IOV_RESOURCES; + struct pci_bus_region region; + u32 new; + int reg; + + /* + * The generic pci_restore_bars() path calls this for all devices, + * including VFs and non-SR-IOV devices. If this is not a PF, we + * have nothing to do. + */ + if (!iov) + return; + + /* + * Ignore unimplemented BARs, unused resource slots for 64-bit + * BARs, and non-movable resources, e.g., those described via + * Enhanced Allocation. + */ + if (!res->flags) + return; + + if (res->flags & IORESOURCE_UNSET) + return; + + if (res->flags & IORESOURCE_PCI_FIXED) + return; + + pcibios_resource_to_bus(dev->bus, ®ion, res); + new = region.start; + new |= res->flags & ~PCI_BASE_ADDRESS_MEM_MASK; + + reg = iov->pos + PCI_SRIOV_BAR + 4 * vf_bar; + pci_write_config_dword(dev, reg, new); + if (res->flags & IORESOURCE_MEM_64) { + new = region.start >> 16 >> 16; + pci_write_config_dword(dev, reg + 4, new); + } +} + resource_size_t __weak pcibios_iov_resource_alignment(struct pci_dev *dev, int resno) { diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index 4518562..5bfcb92 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -290,6 +290,7 @@ static inline void pci_restore_ats_state(struct pci_dev *dev) int pci_iov_init(struct pci_dev *dev); void pci_iov_release(struct pci_dev *dev); int pci_iov_resource_bar(struct pci_dev *dev, int resno); +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); diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c index 9526e34..695f32d 100644 --- a/drivers/pci/setup-res.c +++ b/drivers/pci/setup-res.c @@ -25,8 +25,7 @@ #include #include "pci.h" - -void pci_update_resource(struct pci_dev *dev, int resno) +static void pci_std_update_resource(struct pci_dev *dev, int resno) { struct pci_bus_region region; bool disable; @@ -110,6 +109,16 @@ void pci_update_resource(struct pci_dev *dev, int resno) pci_write_config_word(dev, PCI_COMMAND, cmd); } +void pci_update_resource(struct pci_dev *dev, int resno) +{ + if (resno <= PCI_ROM_RESOURCE) + pci_std_update_resource(dev, resno); +#ifdef CONFIG_PCI_IOV + else if (resno >= PCI_IOV_RESOURCES && resno <= PCI_IOV_RESOURCE_END) + pci_iov_update_resource(dev, resno); +#endif +} + int pci_claim_resource(struct pci_dev *dev, int resource) { struct resource *res = &dev->resource[resource];