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Date: Tue, 30 May 2017 11:53:57 -0700
From: "Raj, Ashok" <ashok.raj@...el.com>
To: Bjorn Helgaas <helgaas@...nel.org>
Cc: Jean-Phillipe Brucker <jean-philippe.brucker@....com>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Joerg Roedel <joro@...tes.org>, linux-pci@...r.kernel.org,
linux-kernel@...r.kernel.org, CQ Tang <cq.tang@...el.com>,
David Woodhouse <dwmw2@...radead.org>,
iommu@...ts.linux-foundation.org, ashok.raj@...el.com
Subject: Re: [PATCH 2/2] PCI: Save properties required to handle FLR for
replay purposes.
On Tue, May 30, 2017 at 02:50:33PM -0500, Bjorn Helgaas wrote:
> On Tue, May 30, 2017 at 09:25:49AM -0700, Ashok Raj wrote:
> > From: CQ Tang <cq.tang@...el.com>
> >
> > Requires: https://patchwork.kernel.org/patch/9593891
>
> The above patch (9593891) is not in my tree or Linus' tree, so I can't
> do anything with this yet.
I resent the patch as part of this series.. maybe should have massaged the
commit message.. my bad :-(. Its the first patch in this series.
Jean mentioned it might take him a while before the SVM patches stabilize.
Since this patch is pretty much stand alone, he asked if i could resend it
along with the one i need.
Sorry for any confusion.
Cheers,
Ashok
>
> > After a FLR, pci-states need to be restored. This patch saves PASID features
> > and PRI reqs cached.
> >
> > To: Bjorn Helgaas <bhelgaas@...gle.com>
> > To: Joerg Roedel <joro@...tes.org>
> > To: linux-pci@...r.kernel.org
> > To: linux-kernel@...r.kernel.org
> > Cc: Jean-Phillipe Brucker <jean-philippe.brucker@....com>
> > Cc: David Woodhouse <dwmw2@...radead.org>
> > Cc: iommu@...ts.linux-foundation.org
> >
> > Signed-off-by: CQ Tang <cq.tang@...el.com>
> > Signed-off-by: Ashok Raj <ashok.raj@...el.com>
> > ---
> > drivers/pci/ats.c | 65 +++++++++++++++++++++++++++++++++++++------------
> > drivers/pci/pci.c | 3 +++
> > include/linux/pci-ats.h | 10 ++++++++
> > include/linux/pci.h | 6 +++++
> > 4 files changed, 69 insertions(+), 15 deletions(-)
> >
> > diff --git a/drivers/pci/ats.c b/drivers/pci/ats.c
> > index 2126497..a769955 100644
> > --- a/drivers/pci/ats.c
> > +++ b/drivers/pci/ats.c
> > @@ -160,17 +160,16 @@ int pci_enable_pri(struct pci_dev *pdev, u32 reqs)
> > if (!pos)
> > return -EINVAL;
> >
> > - pci_read_config_word(pdev, pos + PCI_PRI_CTRL, &control);
> > pci_read_config_word(pdev, pos + PCI_PRI_STATUS, &status);
> > - if ((control & PCI_PRI_CTRL_ENABLE) ||
> > - !(status & PCI_PRI_STATUS_STOPPED))
> > + if (!(status & PCI_PRI_STATUS_STOPPED))
> > return -EBUSY;
> >
> > pci_read_config_dword(pdev, pos + PCI_PRI_MAX_REQ, &max_requests);
> > reqs = min(max_requests, reqs);
> > + pdev->pri_reqs_alloc = reqs;
> > pci_write_config_dword(pdev, pos + PCI_PRI_ALLOC_REQ, reqs);
> >
> > - control |= PCI_PRI_CTRL_ENABLE;
> > + control = PCI_PRI_CTRL_ENABLE;
> > pci_write_config_word(pdev, pos + PCI_PRI_CTRL, control);
> >
> > pdev->pri_enabled = 1;
> > @@ -206,6 +205,29 @@ void pci_disable_pri(struct pci_dev *pdev)
> > EXPORT_SYMBOL_GPL(pci_disable_pri);
> >
> > /**
> > + * pci_restore_pri_state - Restore PRI
> > + * @pdev: PCI device structure
> > + *
> > + */
> > +void pci_restore_pri_state(struct pci_dev *pdev)
> > +{
> > + u16 control = PCI_PRI_CTRL_ENABLE;
> > + u32 reqs = pdev->pri_reqs_alloc;
> > + int pos;
> > +
> > + pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI);
> > + if (!pos)
> > + return;
> > +
> > + if (!pdev->pri_enabled)
> > + return;
> > +
> > + pci_write_config_dword(pdev, pos + PCI_PRI_ALLOC_REQ, reqs);
> > + pci_write_config_word(pdev, pos + PCI_PRI_CTRL, control);
> > +}
> > +EXPORT_SYMBOL_GPL(pci_restore_pri_state);
> > +
> > +/**
> > * pci_reset_pri - Resets device's PRI state
> > * @pdev: PCI device structure
> > *
> > @@ -224,12 +246,7 @@ int pci_reset_pri(struct pci_dev *pdev)
> > if (!pos)
> > return -EINVAL;
> >
> > - pci_read_config_word(pdev, pos + PCI_PRI_CTRL, &control);
> > - if (control & PCI_PRI_CTRL_ENABLE)
> > - return -EBUSY;
> > -
> > - control |= PCI_PRI_CTRL_RESET;
> > -
> > + control = PCI_PRI_CTRL_RESET;
> > pci_write_config_word(pdev, pos + PCI_PRI_CTRL, control);
> >
> > return 0;
> > @@ -259,12 +276,7 @@ int pci_enable_pasid(struct pci_dev *pdev, int features)
> > if (!pos)
> > return -EINVAL;
> >
> > - pci_read_config_word(pdev, pos + PCI_PASID_CTRL, &control);
> > pci_read_config_word(pdev, pos + PCI_PASID_CAP, &supported);
> > -
> > - if (control & PCI_PASID_CTRL_ENABLE)
> > - return -EINVAL;
> > -
> > supported &= PCI_PASID_CAP_EXEC | PCI_PASID_CAP_PRIV;
> >
> > /* User wants to enable anything unsupported? */
> > @@ -272,6 +284,7 @@ int pci_enable_pasid(struct pci_dev *pdev, int features)
> > return -EINVAL;
> >
> > control = PCI_PASID_CTRL_ENABLE | features;
> > + pdev->pasid_features = features;
> >
> > pci_write_config_word(pdev, pos + PCI_PASID_CTRL, control);
> >
> > @@ -305,6 +318,28 @@ void pci_disable_pasid(struct pci_dev *pdev)
> > EXPORT_SYMBOL_GPL(pci_disable_pasid);
> >
> > /**
> > + * pci_restore_pasid_state - Restore PASID capabilities.
> > + * @pdev: PCI device structure
> > + *
> > + */
> > +void pci_restore_pasid_state(struct pci_dev *pdev)
> > +{
> > + u16 control;
> > + int pos;
> > +
> > + pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PASID);
> > + if (!pos)
> > + return;
> > +
> > + if (!pdev->pasid_enabled)
> > + return;
> > +
> > + control = PCI_PASID_CTRL_ENABLE | pdev->pasid_features;
> > + pci_write_config_word(pdev, pos + PCI_PASID_CTRL, control);
> > +}
> > +EXPORT_SYMBOL_GPL(pci_restore_pasid_state);
> > +
> > +/**
> > * pci_pasid_features - Check which PASID features are supported
> > * @pdev: PCI device structure
> > *
> > diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> > index 7904d02..c9a6510 100644
> > --- a/drivers/pci/pci.c
> > +++ b/drivers/pci/pci.c
> > @@ -28,6 +28,7 @@
> > #include <linux/pm_runtime.h>
> > #include <linux/pci_hotplug.h>
> > #include <linux/vmalloc.h>
> > +#include <linux/pci-ats.h>
> > #include <asm/setup.h>
> > #include <asm/dma.h>
> > #include <linux/aer.h>
> > @@ -1171,6 +1172,8 @@ void pci_restore_state(struct pci_dev *dev)
> >
> > /* PCI Express register must be restored first */
> > pci_restore_pcie_state(dev);
> > + pci_restore_pasid_state(dev);
> > + pci_restore_pri_state(dev);
> > pci_restore_ats_state(dev);
> > pci_restore_vc_state(dev);
> >
> > diff --git a/include/linux/pci-ats.h b/include/linux/pci-ats.h
> > index 57e0b82..782fb8e 100644
> > --- a/include/linux/pci-ats.h
> > +++ b/include/linux/pci-ats.h
> > @@ -7,6 +7,7 @@
> >
> > int pci_enable_pri(struct pci_dev *pdev, u32 reqs);
> > void pci_disable_pri(struct pci_dev *pdev);
> > +void pci_restore_pri_state(struct pci_dev *pdev);
> > int pci_reset_pri(struct pci_dev *pdev);
> >
> > #else /* CONFIG_PCI_PRI */
> > @@ -20,6 +21,10 @@ static inline void pci_disable_pri(struct pci_dev *pdev)
> > {
> > }
> >
> > +static inline void pci_restore_pri_state(struct pci_dev *pdev)
> > +{
> > +}
> > +
> > static inline int pci_reset_pri(struct pci_dev *pdev)
> > {
> > return -ENODEV;
> > @@ -31,6 +36,7 @@ static inline int pci_reset_pri(struct pci_dev *pdev)
> >
> > int pci_enable_pasid(struct pci_dev *pdev, int features);
> > void pci_disable_pasid(struct pci_dev *pdev);
> > +void pci_restore_pasid_state(struct pci_dev *pdev);
> > int pci_pasid_features(struct pci_dev *pdev);
> > int pci_max_pasids(struct pci_dev *pdev);
> >
> > @@ -45,6 +51,10 @@ static inline void pci_disable_pasid(struct pci_dev *pdev)
> > {
> > }
> >
> > +static inline void pci_restore_pasid_state(struct pci_dev *pdev)
> > +{
> > +}
> > +
> > static inline int pci_pasid_features(struct pci_dev *pdev)
> > {
> > return -EINVAL;
> > diff --git a/include/linux/pci.h b/include/linux/pci.h
> > index bee980e..1ddb8e0 100644
> > --- a/include/linux/pci.h
> > +++ b/include/linux/pci.h
> > @@ -395,6 +395,12 @@ struct pci_dev {
> > u8 ats_stu; /* ATS Smallest Translation Unit */
> > atomic_t ats_ref_cnt; /* number of VFs with ATS enabled */
> > #endif
> > +#ifdef CONFIG_PCI_PRI
> > + u32 pri_reqs_alloc; /* Number of PRI requests allocated */
> > +#endif
> > +#ifdef CONFIG_PCI_PASID
> > + u16 pasid_features;
> > +#endif
> > phys_addr_t rom; /* Physical address of ROM if it's not from the BAR */
> > size_t romlen; /* Length of ROM if it's not from the BAR */
> > char *driver_override; /* Driver name to force a match */
> > --
> > 2.7.4
> >
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