Commit b07579c0 authored by Wei Yang's avatar Wei Yang Committed by Benjamin Herrenschmidt
Browse files

PCI: Export pci_iov_virtfn_bus() and pci_iov_virtfn_devfn() 



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: default avatarWei Yang <weiyang@linux.vnet.ibm.com>
Acked-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent 4449f079

drivers/pci/iov.c

+16 −12
Original line number Diff line number Diff line
@@ -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);

include/linux/pci.h

+11 −0
Original line number Diff line number Diff line
@@ -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) { }

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