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Date: Tue, 30 May 2017 15:58:08 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: Ashok Raj <ashok.raj@...el.com>
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
Subject: Re: [PATCH 2/2] PCI: Save properties required to handle FLR for
replay purposes.
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
>
>
> 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;
I propose swapping the order of these tests, so that if PRI is not
enabled, we don't have to search for the capability. Similarly for
PASID below.
I made these changes and re-indented these functions on my branch. No
action required unless you object to these changes.
> +
> + 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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