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PCI: Export pci_iov_virtfn_bus() and pci_iov_virtfn_devfn()

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On PowerNV, some resource reservation is needed for SR-IOV VFs that don't
exist at the bootup stage.  To do the match between resources and VFs, the
code need to get the VF's BDF in advance.

Rename virtfn_bus() and virtfn_devfn() to pci_iov_virtfn_bus() and
pci_iov_virtfn_devfn() and export them.

[bhelgaas: changelog, make "busnr" int]
Signed-off-by: Wei Yang <weiyang@linux.vnet.ibm.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Wei Yang 2015-03-25 16:23:48 +08:00 committed by Benjamin Herrenschmidt
parent 4449f07972
commit b07579c092
2 changed files with 27 additions and 12 deletions
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28
drivers/pci/iov.c
View File

@ -19,16 +19,20 @@
#define VIRTFN_ID_LEN 16
static inline u8 virtfn_bus(struct pci_dev *dev, int id)
int pci_iov_virtfn_bus(struct pci_dev *dev, int vf_id)
{
if (!dev->is_physfn)
return -EINVAL;
return dev->bus->number + ((dev->devfn + dev->sriov->offset +
dev->sriov->stride * id) >> 8);
dev->sriov->stride * vf_id) >> 8);
}
static inline u8 virtfn_devfn(struct pci_dev *dev, int id)
int pci_iov_virtfn_devfn(struct pci_dev *dev, int vf_id)
{
if (!dev->is_physfn)
return -EINVAL;
return (dev->devfn + dev->sriov->offset +
dev->sriov->stride * id) & 0xff;
dev->sriov->stride * vf_id) & 0xff;
}
/*
@ -58,11 +62,11 @@ static inline u8 virtfn_max_buses(struct pci_dev *dev)
struct pci_sriov *iov = dev->sriov;
int nr_virtfn;
u8 max = 0;
u8 busnr;
int busnr;
for (nr_virtfn = 1; nr_virtfn <= iov->total_VFs; nr_virtfn++) {
pci_iov_set_numvfs(dev, nr_virtfn);
busnr = virtfn_bus(dev, nr_virtfn - 1);
busnr = pci_iov_virtfn_bus(dev, nr_virtfn - 1);
if (busnr > max)
max = busnr;
}
@ -116,7 +120,7 @@ static int virtfn_add(struct pci_dev *dev, int id, int reset)
struct pci_bus *bus;
mutex_lock(&iov->dev->sriov->lock);
bus = virtfn_add_bus(dev->bus, virtfn_bus(dev, id));
bus = virtfn_add_bus(dev->bus, pci_iov_virtfn_bus(dev, id));
if (!bus)
goto failed;
@ -124,7 +128,7 @@ static int virtfn_add(struct pci_dev *dev, int id, int reset)
if (!virtfn)
goto failed0;
virtfn->devfn = virtfn_devfn(dev, id);
virtfn->devfn = pci_iov_virtfn_devfn(dev, id);
virtfn->vendor = dev->vendor;
pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_DID, &virtfn->device);
pci_setup_device(virtfn);
@ -186,8 +190,8 @@ static void virtfn_remove(struct pci_dev *dev, int id, int reset)
struct pci_sriov *iov = dev->sriov;
virtfn = pci_get_domain_bus_and_slot(pci_domain_nr(dev->bus),
virtfn_bus(dev, id),
virtfn_devfn(dev, id));
pci_iov_virtfn_bus(dev, id),
pci_iov_virtfn_devfn(dev, id));
if (!virtfn)
return;
@ -226,7 +230,7 @@ static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
struct pci_dev *pdev;
struct pci_sriov *iov = dev->sriov;
int bars = 0;
u8 bus;
int bus;
if (!nr_virtfn)
return 0;
@ -263,7 +267,7 @@ static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
iov->offset = offset;
iov->stride = stride;
bus = virtfn_bus(dev, nr_virtfn - 1);
bus = pci_iov_virtfn_bus(dev, nr_virtfn - 1);
if (bus > dev->bus->busn_res.end) {
dev_err(&dev->dev, "can't enable %d VFs (bus %02x out of range of %pR)\n",
nr_virtfn, bus, &dev->bus->busn_res);

11
include/linux/pci.h
View File

@ -1669,6 +1669,9 @@ int pci_ext_cfg_avail(void);
void __iomem *pci_ioremap_bar(struct pci_dev *pdev, int bar);
#ifdef CONFIG_PCI_IOV
int pci_iov_virtfn_bus(struct pci_dev *dev, int id);
int pci_iov_virtfn_devfn(struct pci_dev *dev, int id);
int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn);
void pci_disable_sriov(struct pci_dev *dev);
int pci_num_vf(struct pci_dev *dev);
@ -1677,6 +1680,14 @@ int pci_sriov_set_totalvfs(struct pci_dev *dev, u16 numvfs);
int pci_sriov_get_totalvfs(struct pci_dev *dev);
resource_size_t pci_iov_resource_size(struct pci_dev *dev, int resno);
#else
static inline int pci_iov_virtfn_bus(struct pci_dev *dev, int id)
{
return -ENOSYS;
}
static inline int pci_iov_virtfn_devfn(struct pci_dev *dev, int id)
{
return -ENOSYS;
}
static inline int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn)
{ return -ENODEV; }
static inline void pci_disable_sriov(struct pci_dev *dev) { }