[RFC PATCH V3 13/17] powerpc/powernv: shift VF resource with an offset
From: Wei Yang <hidden>
Date: 2014-06-10 01:57:18
Also in:
linux-pci
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Linus Torvalds
On powrnv platform, resource position in M64 implies the PE# the resource belongs to. In some particular case, adjustment of a resource is necessary to locate it to a correct position in M64. This patch introduce a function to shift the 'real' VF BAR address according to an offset. Signed-off-by: Wei Yang <redacted> --- arch/powerpc/platforms/powernv/pci-ioda.c | 30 +++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+)
diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index b0ac851..e46c5bf 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c@@ -13,6 +13,7 @@ #include <linux/kernel.h> #include <linux/pci.h> +#include <linux/pci_regs.h> #include <linux/debugfs.h> #include <linux/delay.h> #include <linux/string.h>
@@ -544,6 +545,35 @@ static unsigned int pnv_ioda_dma_weight(struct pci_dev *dev) return 10; } +#ifdef CONFIG_PCI_IOV +static void pnv_pci_vf_resource_shift(struct pci_dev *dev, int offset) +{ + struct pci_dn *pdn = pci_get_pdn(dev); + int i; + struct resource *res; + resource_size_t size; + + if (dev->is_physfn) { + for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { + res = dev->resource + PCI_IOV_RESOURCES + i; + if (!res->flags || !res->parent) + continue; + + if (!is_mem_pref_64_type(res->flags)) + continue; + + dev_info(&dev->dev, "PowerNV: Shifting VF BAR %pR to\n", res); + size = pci_sriov_resource_size(dev, PCI_IOV_RESOURCES + i); + res->start += size*offset; + + dev_info(&dev->dev, " %pR\n", res); + pci_update_resource(dev, PCI_IOV_RESOURCES + i); + } + pdn->vfs -= offset; + } +} +#endif /* CONFIG_PCI_IOV */ + #if 0 static struct pnv_ioda_pe *pnv_ioda_setup_dev_PE(struct pci_dev *dev) {
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1.7.9.5