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path: root/drivers/pci/iov.c
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Diffstat (limited to 'drivers/pci/iov.c')
-rw-r--r--drivers/pci/iov.c155
1 files changed, 114 insertions, 41 deletions
diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
index 4b3a4eaad996..ee0ebff103a4 100644
--- a/drivers/pci/iov.c
+++ b/drivers/pci/iov.c
@@ -19,16 +19,59 @@
#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;
+}
+
+/*
+ * Per SR-IOV spec sec 3.3.10 and 3.3.11, First VF Offset and VF Stride may
+ * change when NumVFs changes.
+ *
+ * Update iov->offset and iov->stride when NumVFs is written.
+ */
+static inline void pci_iov_set_numvfs(struct pci_dev *dev, int nr_virtfn)
+{
+ struct pci_sriov *iov = dev->sriov;
+
+ pci_write_config_word(dev, iov->pos + PCI_SRIOV_NUM_VF, nr_virtfn);
+ pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_OFFSET, &iov->offset);
+ pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_STRIDE, &iov->stride);
+}
+
+/*
+ * The PF consumes one bus number. NumVFs, First VF Offset, and VF Stride
+ * determine how many additional bus numbers will be consumed by VFs.
+ *
+ * Iterate over all valid NumVFs and calculate the maximum number of bus
+ * numbers that could ever be required.
+ */
+static inline u8 virtfn_max_buses(struct pci_dev *dev)
+{
+ struct pci_sriov *iov = dev->sriov;
+ int nr_virtfn;
+ u8 max = 0;
+ int busnr;
+
+ for (nr_virtfn = 1; nr_virtfn <= iov->total_VFs; nr_virtfn++) {
+ pci_iov_set_numvfs(dev, nr_virtfn);
+ busnr = pci_iov_virtfn_bus(dev, nr_virtfn - 1);
+ if (busnr > max)
+ max = busnr;
+ }
+
+ return max;
}
static struct pci_bus *virtfn_add_bus(struct pci_bus *bus, int busnr)
@@ -57,6 +100,14 @@ static void virtfn_remove_bus(struct pci_bus *physbus, struct pci_bus *virtbus)
pci_remove_bus(virtbus);
}
+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];
+}
+
static int virtfn_add(struct pci_dev *dev, int id, int reset)
{
int i;
@@ -69,7 +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;
@@ -77,7 +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);
@@ -87,13 +138,12 @@ static int virtfn_add(struct pci_dev *dev, int id, int reset)
virtfn->multifunction = 0;
for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
- res = dev->resource + PCI_IOV_RESOURCES + i;
+ res = &dev->resource[i + PCI_IOV_RESOURCES];
if (!res->parent)
continue;
virtfn->resource[i].name = pci_name(virtfn);
virtfn->resource[i].flags = res->flags;
- size = resource_size(res);
- do_div(size, iov->total_VFs);
+ size = pci_iov_resource_size(dev, i + PCI_IOV_RESOURCES);
virtfn->resource[i].start = res->start + size * id;
virtfn->resource[i].end = virtfn->resource[i].start + size - 1;
rc = request_resource(res, &virtfn->resource[i]);
@@ -140,8 +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;
@@ -170,6 +220,11 @@ static void virtfn_remove(struct pci_dev *dev, int id, int reset)
pci_dev_put(dev);
}
+int __weak pcibios_sriov_enable(struct pci_dev *pdev, u16 num_vfs)
+{
+ return 0;
+}
+
static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
{
int rc;
@@ -180,6 +235,8 @@ static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
struct pci_dev *pdev;
struct pci_sriov *iov = dev->sriov;
int bars = 0;
+ int bus;
+ int retval;
if (!nr_virtfn)
return 0;
@@ -204,7 +261,7 @@ 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 + PCI_IOV_RESOURCES + i;
+ res = &dev->resource[i + PCI_IOV_RESOURCES];
if (res->parent)
nres++;
}
@@ -216,8 +273,10 @@ static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
iov->offset = offset;
iov->stride = stride;
- if (virtfn_bus(dev, nr_virtfn - 1) > dev->bus->busn_res.end) {
- dev_err(&dev->dev, "SR-IOV: bus number out of range\n");
+ 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);
return -ENOMEM;
}
@@ -243,7 +302,7 @@ static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
return rc;
}
- pci_write_config_word(dev, iov->pos + PCI_SRIOV_NUM_VF, nr_virtfn);
+ pci_iov_set_numvfs(dev, nr_virtfn);
iov->ctrl |= PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE;
pci_cfg_access_lock(dev);
pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
@@ -254,6 +313,12 @@ static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
if (nr_virtfn < initial)
initial = nr_virtfn;
+ if ((retval = pcibios_sriov_enable(dev, initial))) {
+ dev_err(&dev->dev, "failure %d from pcibios_sriov_enable()\n",
+ retval);
+ return retval;
+ }
+
for (i = 0; i < initial; i++) {
rc = virtfn_add(dev, i, 0);
if (rc)
@@ -272,7 +337,7 @@ failed:
iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE);
pci_cfg_access_lock(dev);
pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
- pci_write_config_word(dev, iov->pos + PCI_SRIOV_NUM_VF, 0);
+ pci_iov_set_numvfs(dev, 0);
ssleep(1);
pci_cfg_access_unlock(dev);
@@ -282,6 +347,11 @@ failed:
return rc;
}
+int __weak pcibios_sriov_disable(struct pci_dev *pdev)
+{
+ return 0;
+}
+
static void sriov_disable(struct pci_dev *dev)
{
int i;
@@ -293,6 +363,8 @@ static void sriov_disable(struct pci_dev *dev)
for (i = 0; i < iov->num_VFs; i++)
virtfn_remove(dev, i, 0);
+ pcibios_sriov_disable(dev);
+
iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE);
pci_cfg_access_lock(dev);
pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
@@ -303,12 +375,12 @@ static void sriov_disable(struct pci_dev *dev)
sysfs_remove_link(&dev->dev.kobj, "dep_link");
iov->num_VFs = 0;
- pci_write_config_word(dev, iov->pos + PCI_SRIOV_NUM_VF, 0);
+ pci_iov_set_numvfs(dev, 0);
}
static int sriov_init(struct pci_dev *dev, int pos)
{
- int i;
+ int i, bar64;
int rc;
int nres;
u32 pgsz;
@@ -357,27 +429,29 @@ found:
pgsz &= ~(pgsz - 1);
pci_write_config_dword(dev, pos + PCI_SRIOV_SYS_PGSIZE, pgsz);
+ iov = kzalloc(sizeof(*iov), GFP_KERNEL);
+ if (!iov)
+ return -ENOMEM;
+
nres = 0;
for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
- res = dev->resource + PCI_IOV_RESOURCES + i;
- i += __pci_read_base(dev, pci_bar_unknown, res,
- pos + PCI_SRIOV_BAR + i * 4);
+ res = &dev->resource[i + PCI_IOV_RESOURCES];
+ bar64 = __pci_read_base(dev, pci_bar_unknown, res,
+ pos + PCI_SRIOV_BAR + i * 4);
if (!res->flags)
continue;
if (resource_size(res) & (PAGE_SIZE - 1)) {
rc = -EIO;
goto failed;
}
+ iov->barsz[i] = resource_size(res);
res->end = res->start + resource_size(res) * total - 1;
+ dev_info(&dev->dev, "VF(n) BAR%d space: %pR (contains BAR%d for %d VFs)\n",
+ i, res, i, total);
+ i += bar64;
nres++;
}
- iov = kzalloc(sizeof(*iov), GFP_KERNEL);
- if (!iov) {
- rc = -ENOMEM;
- goto failed;
- }
-
iov->pos = pos;
iov->nres = nres;
iov->ctrl = ctrl;
@@ -400,15 +474,17 @@ found:
dev->sriov = iov;
dev->is_physfn = 1;
+ iov->max_VF_buses = virtfn_max_buses(dev);
return 0;
failed:
for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
- res = dev->resource + PCI_IOV_RESOURCES + i;
+ res = &dev->resource[i + PCI_IOV_RESOURCES];
res->flags = 0;
}
+ kfree(iov);
return rc;
}
@@ -439,7 +515,7 @@ static void sriov_restore_state(struct pci_dev *dev)
pci_update_resource(dev, i);
pci_write_config_dword(dev, iov->pos + PCI_SRIOV_SYS_PGSIZE, iov->pgsz);
- pci_write_config_word(dev, iov->pos + PCI_SRIOV_NUM_VF, iov->num_VFs);
+ pci_iov_set_numvfs(dev, iov->num_VFs);
pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
if (iov->ctrl & PCI_SRIOV_CTRL_VFE)
msleep(100);
@@ -493,6 +569,12 @@ int pci_iov_resource_bar(struct pci_dev *dev, int resno)
4 * (resno - PCI_IOV_RESOURCES);
}
+resource_size_t __weak pcibios_iov_resource_alignment(struct pci_dev *dev,
+ int resno)
+{
+ return pci_iov_resource_size(dev, resno);
+}
+
/**
* pci_sriov_resource_alignment - get resource alignment for VF BAR
* @dev: the PCI device
@@ -505,14 +587,7 @@ int pci_iov_resource_bar(struct pci_dev *dev, int resno)
*/
resource_size_t pci_sriov_resource_alignment(struct pci_dev *dev, int resno)
{
- struct resource tmp;
- int reg = pci_iov_resource_bar(dev, resno);
-
- if (!reg)
- return 0;
-
- __pci_read_base(dev, pci_bar_unknown, &tmp, reg);
- return resource_alignment(&tmp);
+ return pcibios_iov_resource_alignment(dev, resno);
}
/**
@@ -535,15 +610,13 @@ void pci_restore_iov_state(struct pci_dev *dev)
int pci_iov_bus_range(struct pci_bus *bus)
{
int max = 0;
- u8 busnr;
struct pci_dev *dev;
list_for_each_entry(dev, &bus->devices, bus_list) {
if (!dev->is_physfn)
continue;
- busnr = virtfn_bus(dev, dev->sriov->total_VFs - 1);
- if (busnr > max)
- max = busnr;
+ if (dev->sriov->max_VF_buses > max)
+ max = dev->sriov->max_VF_buses;
}
return max ? max - bus->number : 0;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.