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Merge branch 'pci/virtualization' into next

Browse source 
* pci/virtualization:
  PCI: Document reset method return values
  PCI: Detach driver before procfs & sysfs teardown on device remove
  PCI: Apply Cavium ThunderX ACS quirk to more Root Ports
  PCI: Set Cavium ACS capability quirk flags to assert RR/CR/SV/UF
  PCI: Restore ARI Capable Hierarchy before setting numVFs
  PCI: Create SR-IOV virtfn/physfn links before attaching driver
  PCI: Expose SR-IOV offset, stride, and VF device ID via sysfs
  PCI: Cache the VF device ID in the SR-IOV structure
  PCI: Add Kconfig PCI_IOV dependency for PCI_REALLOC_ENABLE_AUTO
  PCI: Remove unused function __pci_reset_function()
  PCI: Remove reset argument from pci_iov_{add,remove}_virtfn()
This commit is contained in:
Bjorn Helgaas 2017-11-14 12:11:26 -06:00
commit 9ceb09cce1
9 changed files with 95 additions and 66 deletions
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4
arch/powerpc/kernel/eeh_driver.c
View file

@ -441,7 +441,7 @@ static void *eeh_add_virt_device(void *data, void *userdata)
}
#ifdef CONFIG_PPC_POWERNV
pci_iov_add_virtfn(edev->physfn, pdn->vf_index, 0);
pci_iov_add_virtfn(edev->physfn, pdn->vf_index);
#endif
return NULL;
}
@ -499,7 +499,7 @@ static void *eeh_rmv_device(void *data, void *userdata)
#ifdef CONFIG_PPC_POWERNV
struct pci_dn *pdn = eeh_dev_to_pdn(edev);
pci_iov_remove_virtfn(edev->physfn, pdn->vf_index, 0);
pci_iov_remove_virtfn(edev->physfn, pdn->vf_index);
edev->pdev = NULL;
/*

8
drivers/pci/Kconfig
View file

@ -51,13 +51,13 @@ config PCI_DEBUG
config PCI_REALLOC_ENABLE_AUTO
bool "Enable PCI resource re-allocation detection"
depends on PCI
depends on PCI_IOV
help
Say Y here if you want the PCI core to detect if PCI resource
re-allocation needs to be enabled. You can always use pci=realloc=on
or pci=realloc=off to override it. Note this feature is a no-op
unless PCI_IOV support is also enabled; in that case it will
automatically re-allocate PCI resources if SR-IOV BARs have not
been allocated by the BIOS.
or pci=realloc=off to override it. It will automatically
re-allocate PCI resources if SR-IOV BARs have not been allocated by
the BIOS.
When in doubt, say N.

34
drivers/pci/iov.c
View file

@ -113,7 +113,7 @@ resource_size_t pci_iov_resource_size(struct pci_dev *dev, int resno)
return dev->sriov->barsz[resno - PCI_IOV_RESOURCES];
}
int pci_iov_add_virtfn(struct pci_dev *dev, int id, int reset)
int pci_iov_add_virtfn(struct pci_dev *dev, int id)
{
int i;
int rc = -ENOMEM;
@ -134,7 +134,7 @@ int pci_iov_add_virtfn(struct pci_dev *dev, int id, int reset)
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);
virtfn->device = iov->vf_device;
rc = pci_setup_device(virtfn);
if (rc)
goto failed0;
@ -157,12 +157,8 @@ int pci_iov_add_virtfn(struct pci_dev *dev, int id, int reset)
BUG_ON(rc);
}
if (reset)
__pci_reset_function(virtfn);
pci_device_add(virtfn, virtfn->bus);
pci_bus_add_device(virtfn);
sprintf(buf, "virtfn%u", id);
rc = sysfs_create_link(&dev->dev.kobj, &virtfn->dev.kobj, buf);
if (rc)
@ -173,6 +169,8 @@ int pci_iov_add_virtfn(struct pci_dev *dev, int id, int reset)
kobject_uevent(&virtfn->dev.kobj, KOBJ_CHANGE);
pci_bus_add_device(virtfn);
return 0;
failed2:
@ -187,7 +185,7 @@ int pci_iov_add_virtfn(struct pci_dev *dev, int id, int reset)
return rc;
}
void pci_iov_remove_virtfn(struct pci_dev *dev, int id, int reset)
void pci_iov_remove_virtfn(struct pci_dev *dev, int id)
{
char buf[VIRTFN_ID_LEN];
struct pci_dev *virtfn;
@ -198,11 +196,6 @@ void pci_iov_remove_virtfn(struct pci_dev *dev, int id, int reset)
if (!virtfn)
return;
if (reset) {
device_release_driver(&virtfn->dev);
__pci_reset_function(virtfn);
}
sprintf(buf, "virtfn%u", id);
sysfs_remove_link(&dev->dev.kobj, buf);
/*
@ -317,7 +310,7 @@ static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
pci_cfg_access_unlock(dev);
for (i = 0; i < initial; i++) {
rc = pci_iov_add_virtfn(dev, i, 0);
rc = pci_iov_add_virtfn(dev, i);
if (rc)
goto failed;
}
@ -329,7 +322,7 @@ static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
failed:
while (i--)
pci_iov_remove_virtfn(dev, i, 0);
pci_iov_remove_virtfn(dev, i);
err_pcibios:
iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE);
@ -356,7 +349,7 @@ static void sriov_disable(struct pci_dev *dev)
return;
for (i = 0; i < iov->num_VFs; i++)
pci_iov_remove_virtfn(dev, i, 0);
pci_iov_remove_virtfn(dev, i);
iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE);
pci_cfg_access_lock(dev);
@ -449,6 +442,7 @@ static int sriov_init(struct pci_dev *dev, int pos)
iov->nres = nres;
iov->ctrl = ctrl;
iov->total_VFs = total;
pci_read_config_word(dev, pos + PCI_SRIOV_VF_DID, &iov->vf_device);
iov->pgsz = pgsz;
iov->self = dev;
iov->drivers_autoprobe = true;
@ -504,6 +498,14 @@ static void sriov_restore_state(struct pci_dev *dev)
if (ctrl & PCI_SRIOV_CTRL_VFE)
return;
/*
* Restore PCI_SRIOV_CTRL_ARI before pci_iov_set_numvfs() because
* it reads offset & stride, which depend on PCI_SRIOV_CTRL_ARI.
*/
ctrl &= ~PCI_SRIOV_CTRL_ARI;
ctrl |= iov->ctrl & PCI_SRIOV_CTRL_ARI;
pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, ctrl);
for (i = PCI_IOV_RESOURCES; i <= PCI_IOV_RESOURCE_END; i++)
pci_update_resource(dev, i);
@ -724,7 +726,7 @@ int pci_vfs_assigned(struct pci_dev *dev)
* determine the device ID for the VFs, the vendor ID will be the
* same as the PF so there is no need to check for that one
*/
pci_read_config_word(dev, dev->sriov->pos + PCI_SRIOV_VF_DID, &dev_id);
dev_id = dev->sriov->vf_device;
/* loop through all the VFs to see if we own any that are assigned */
vfdev = pci_get_device(dev->vendor, dev_id, NULL);

33
drivers/pci/pci-sysfs.c
View file

@ -648,6 +648,33 @@ static ssize_t sriov_numvfs_store(struct device *dev,
return count;
}
static ssize_t sriov_offset_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct pci_dev *pdev = to_pci_dev(dev);
return sprintf(buf, "%u\n", pdev->sriov->offset);
}
static ssize_t sriov_stride_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct pci_dev *pdev = to_pci_dev(dev);
return sprintf(buf, "%u\n", pdev->sriov->stride);
}
static ssize_t sriov_vf_device_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct pci_dev *pdev = to_pci_dev(dev);
return sprintf(buf, "%x\n", pdev->sriov->vf_device);
}
static ssize_t sriov_drivers_autoprobe_show(struct device *dev,
struct device_attribute *attr,
char *buf)
@ -676,6 +703,9 @@ static struct device_attribute sriov_totalvfs_attr = __ATTR_RO(sriov_totalvfs);
static struct device_attribute sriov_numvfs_attr =
__ATTR(sriov_numvfs, (S_IRUGO|S_IWUSR|S_IWGRP),
sriov_numvfs_show, sriov_numvfs_store);
static struct device_attribute sriov_offset_attr = __ATTR_RO(sriov_offset);
static struct device_attribute sriov_stride_attr = __ATTR_RO(sriov_stride);
static struct device_attribute sriov_vf_device_attr = __ATTR_RO(sriov_vf_device);
static struct device_attribute sriov_drivers_autoprobe_attr =
__ATTR(sriov_drivers_autoprobe, (S_IRUGO|S_IWUSR|S_IWGRP),
sriov_drivers_autoprobe_show, sriov_drivers_autoprobe_store);
@ -1748,6 +1778,9 @@ static const struct attribute_group pci_dev_hp_attr_group = {
static struct attribute *sriov_dev_attrs[] = {
&sriov_totalvfs_attr.attr,
&sriov_numvfs_attr.attr,
&sriov_offset_attr.attr,
&sriov_stride_attr.attr,
&sriov_vf_device_attr.attr,
&sriov_drivers_autoprobe_attr.attr,
NULL,
};

43
drivers/pci/pci.c
View file

@ -4246,35 +4246,6 @@ static void pci_dev_restore(struct pci_dev *dev)
err_handler->reset_done(dev);
}
/**
* __pci_reset_function - reset a PCI device function
* @dev: PCI device to reset
*
* Some devices allow an individual function to be reset without affecting
* other functions in the same device. The PCI device must be responsive
* to PCI config space in order to use this function.
*
* The device function is presumed to be unused when this function is called.
* Resetting the device will make the contents of PCI configuration space
* random, so any caller of this must be prepared to reinitialise the
* device including MSI, bus mastering, BARs, decoding IO and memory spaces,
* etc.
*
* Returns 0 if the device function was successfully reset or negative if the
* device doesn't support resetting a single function.
*/
int __pci_reset_function(struct pci_dev *dev)
{
int ret;
pci_dev_lock(dev);
ret = __pci_reset_function_locked(dev);
pci_dev_unlock(dev);
return ret;
}
EXPORT_SYMBOL_GPL(__pci_reset_function);
/**
* __pci_reset_function_locked - reset a PCI device function while holding
* the @dev mutex lock.
@ -4300,6 +4271,14 @@ int __pci_reset_function_locked(struct pci_dev *dev)
might_sleep();
/*
* A reset method returns -ENOTTY if it doesn't support this device
* and we should try the next method.
*
* If it returns 0 (success), we're finished. If it returns any
* other error, we're also finished: this indicates that further
* reset mechanisms might be broken on the device.
*/
rc = pci_dev_specific_reset(dev, 0);
if (rc != -ENOTTY)
return rc;
@ -4365,8 +4344,8 @@ int pci_probe_reset_function(struct pci_dev *dev)
*
* This function does not just reset the PCI portion of a device, but
* clears all the state associated with the device. This function differs
* from __pci_reset_function in that it saves and restores device state
* over the reset.
* from __pci_reset_function_locked() in that it saves and restores device state
* over the reset and takes the PCI device lock.
*
* Returns 0 if the device function was successfully reset or negative if the
* device doesn't support resetting a single function.
@ -4401,7 +4380,7 @@ EXPORT_SYMBOL_GPL(pci_reset_function);
*
* This function does not just reset the PCI portion of a device, but
* clears all the state associated with the device. This function differs
* from __pci_reset_function() in that it saves and restores device state
* from __pci_reset_function_locked() in that it saves and restores device state
* over the reset. It also differs from pci_reset_function() in that it
* requires the PCI device lock to be held.
*

1
drivers/pci/pci.h
View file

@ -263,6 +263,7 @@ struct pci_sriov {
u16 num_VFs; /* number of VFs available */
u16 offset; /* first VF Routing ID offset */
u16 stride; /* following VF stride */
u16 vf_device; /* VF device ID */
u32 pgsz; /* page size for BAR alignment */
u8 link; /* Function Dependency Link */
u8 max_VF_buses; /* max buses consumed by VFs */

27
drivers/pci/quirks.c
View file

@ -4211,17 +4211,32 @@ static int pci_quirk_amd_sb_acs(struct pci_dev *dev, u16 acs_flags)
#endif
}
static bool pci_quirk_cavium_acs_match(struct pci_dev *dev)
{
/*
* Effectively selects all downstream ports for whole ThunderX 1
* family by 0xf800 mask (which represents 8 SoCs), while the lower
* bits of device ID are used to indicate which subdevice is used
* within the SoC.
*/
return (pci_is_pcie(dev) &&
(pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT) &&
((dev->device & 0xf800) == 0xa000));
}
static int pci_quirk_cavium_acs(struct pci_dev *dev, u16 acs_flags)
{
/*
* Cavium devices matching this quirk do not perform peer-to-peer
* with other functions, allowing masking out these bits as if they
* were unimplemented in the ACS capability.
* Cavium root ports don't advertise an ACS capability. However,
* the RTL internally implements similar protection as if ACS had
* Request Redirection, Completion Redirection, Source Validation,
* and Upstream Forwarding features enabled. Assert that the
* hardware implements and enables equivalent ACS functionality for
* these flags.
*/
acs_flags &= ~(PCI_ACS_SV | PCI_ACS_TB | PCI_ACS_RR |
PCI_ACS_CR | PCI_ACS_UF | PCI_ACS_DT);
acs_flags &= ~(PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_SV | PCI_ACS_UF);
if (!((dev->device >= 0xa000) && (dev->device <= 0xa0ff)))
if (!pci_quirk_cavium_acs_match(dev))
return -ENOTTY;
return acs_flags ? 0 : 1;

2
drivers/pci/remove.c
View file

@ -19,9 +19,9 @@ static void pci_stop_dev(struct pci_dev *dev)
pci_pme_active(dev, false);
if (dev->is_added) {
device_release_driver(&dev->dev);
pci_proc_detach_device(dev);
pci_remove_sysfs_dev_files(dev);
device_release_driver(&dev->dev);
dev->is_added = 0;
}

9
include/linux/pci.h
View file

@ -1093,7 +1093,6 @@ int pcie_set_mps(struct pci_dev *dev, int mps);
int pcie_get_minimum_link(struct pci_dev *dev, enum pci_bus_speed *speed,
enum pcie_link_width *width);
void pcie_flr(struct pci_dev *dev);
int __pci_reset_function(struct pci_dev *dev);
int __pci_reset_function_locked(struct pci_dev *dev);
int pci_reset_function(struct pci_dev *dev);
int pci_reset_function_locked(struct pci_dev *dev);
@ -1965,8 +1964,8 @@ 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_iov_add_virtfn(struct pci_dev *dev, int id, int reset);
void pci_iov_remove_virtfn(struct pci_dev *dev, int id, int reset);
int pci_iov_add_virtfn(struct pci_dev *dev, int id);
void pci_iov_remove_virtfn(struct pci_dev *dev, int id);
int pci_num_vf(struct pci_dev *dev);
int pci_vfs_assigned(struct pci_dev *dev);
int pci_sriov_set_totalvfs(struct pci_dev *dev, u16 numvfs);
@ -1983,12 +1982,12 @@ static inline int pci_iov_virtfn_devfn(struct pci_dev *dev, int id)
}
static inline int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn)
{ return -ENODEV; }
static inline int pci_iov_add_virtfn(struct pci_dev *dev, int id, int reset)
static inline int pci_iov_add_virtfn(struct pci_dev *dev, int id)
{
return -ENOSYS;
}
static inline void pci_iov_remove_virtfn(struct pci_dev *dev,
int id, int reset) { }
int id) { }
static inline void pci_disable_sriov(struct pci_dev *dev) { }
static inline int pci_num_vf(struct pci_dev *dev) { return 0; }
static inline int pci_vfs_assigned(struct pci_dev *dev)