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Save and restore SRIOV-related config registers.

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Save the value of the IOV control and page size registers and restore
them (along with the VF count) in pci_cfg_save/pci_cfg_restore.  This
ensures ARI remains enabled if a PF driver resets itself during the
PCI_IOV_INIT callback.  This might also properly restore SRIOV state
across suspend/resume.

Reviewed by:	rstone, vangyzen
Differential Revision:	https://reviews.freebsd.org/D6192
This commit is contained in:
John Baldwin 2016-05-03 19:45:24 +00:00
parent b83c5d07c1
commit e402d55c84
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=299002
3 changed files with 36 additions and 0 deletions
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7
sys/dev/pci/pci.c
View File

@ -5643,6 +5643,10 @@ pci_cfg_restore(device_t dev, struct pci_devinfo *dinfo)
pci_resume_msi(dev);
if (dinfo->cfg.msix.msix_location != 0)
pci_resume_msix(dev);
if (dinfo->cfg.iov != NULL)
pci_iov_cfg_restore(dev, dinfo);
}
static void
@ -5755,6 +5759,9 @@ pci_cfg_save(device_t dev, struct pci_devinfo *dinfo, int setstate)
if (dinfo->cfg.pcix.pcix_location != 0)
pci_cfg_save_pcix(dev, dinfo);
if (dinfo->cfg.iov != NULL)
pci_iov_cfg_save(dev, dinfo);
/*
* don't set the state for display devices, base peripherals and
* memory devices since bad things happen when they are powered down.

23
sys/dev/pci/pci_iov.c
View File

@ -770,6 +770,29 @@ pci_iov_config(struct cdev *cdev, struct pci_iov_arg *arg)
return (error);
}
void
pci_iov_cfg_restore(device_t dev, struct pci_devinfo *dinfo)
{
struct pcicfg_iov *iov;
iov = dinfo->cfg.iov;
IOV_WRITE(dinfo, PCIR_SRIOV_PAGE_SIZE, iov->iov_page_size, 4);
IOV_WRITE(dinfo, PCIR_SRIOV_NUM_VFS, iov->iov_num_vfs, 2);
IOV_WRITE(dinfo, PCIR_SRIOV_CTL, iov->iov_ctl, 2);
}
void
pci_iov_cfg_save(device_t dev, struct pci_devinfo *dinfo)
{
struct pcicfg_iov *iov;
iov = dinfo->cfg.iov;
iov->iov_page_size = IOV_READ(dinfo, PCIR_SRIOV_PAGE_SIZE, 4);
iov->iov_ctl = IOV_READ(dinfo, PCIR_SRIOV_CTL, 2);
}
/* Return true if child is a VF of the given PF. */
static int
pci_iov_is_child_vf(struct pcicfg_iov *pf, device_t child)

6
sys/dev/pci/pci_iov_private.h
View File

@ -47,10 +47,16 @@ struct pcicfg_iov {
int iov_pos;
int iov_num_vfs;
uint32_t iov_flags;
uint16_t iov_ctl;
uint32_t iov_page_size;
};
#define IOV_RMAN_INITED 0x0001
#define IOV_BUSY 0x0002
void pci_iov_cfg_restore(device_t dev, struct pci_devinfo *dinfo);
void pci_iov_cfg_save(device_t dev, struct pci_devinfo *dinfo);
#endif