| Message ID | 3e560e2b-7f11-74e2-6db5-60c8479dc59b@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
From: Heiner Kallweit <hkallweit1@gmail.com> Date: Sun, 10 Dec 2017 00:43:48 +0100 > Introduce a device-managed version of pci_set_mwi. First user is the > Realtek r8169 driver. > > Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Bjorn, can I get an ACK on this? And would you be OK with this going through my tree as the patches later in this series give an example of usage? Thanks.
On Sun, Dec 10, 2017 at 12:43:48AM +0100, Heiner Kallweit wrote: > Introduce a device-managed version of pci_set_mwi. First user is the > Realtek r8169 driver. > > Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> With the subject and changelog as follows and the code reordering below, PCI: Add pcim_set_mwi(), a device-managed pci_set_mwi() Add pcim_set_mwi(), a device-managed version of pci_set_mwi(). First user is the Realtek r8169 driver. Acked-by: Bjorn Helgaas <bhelgaas@google.com> With these changes, feel free to merge with the series via the netdev tree. > --- > drivers/pci/pci.c | 29 +++++++++++++++++++++++++++++ > include/linux/pci.h | 1 + > 2 files changed, 30 insertions(+) > > diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c > index 4a7c6864f..fc57c378d 100644 > --- a/drivers/pci/pci.c > +++ b/drivers/pci/pci.c > @@ -1458,6 +1458,7 @@ struct pci_devres { > unsigned int pinned:1; > unsigned int orig_intx:1; > unsigned int restore_intx:1; > + unsigned int mwi:1; > u32 region_mask; > }; > > @@ -1476,6 +1477,9 @@ static void pcim_release(struct device *gendev, void *res) > if (this->region_mask & (1 << i)) > pci_release_region(dev, i); > > + if (this->mwi) > + pci_clear_mwi(dev); > + > if (this->restore_intx) > pci_intx(dev, this->orig_intx); > > @@ -3760,6 +3764,31 @@ int pci_set_mwi(struct pci_dev *dev) > } > EXPORT_SYMBOL(pci_set_mwi); > > +/** > + * pcim_set_mwi - Managed pci_set_mwi() > + * @dev: the PCI device for which MWI is enabled > + * > + * Managed pci_set_mwi(). > + * > + * RETURNS: An appropriate -ERRNO error value on error, or zero for success. > + */ > +int pcim_set_mwi(struct pci_dev *dev) > +{ > + struct pci_devres *dr; > + int ret; > + > + ret = pci_set_mwi(dev); > + if (ret) > + return ret; > + > + dr = find_pci_dr(dev); > + if (dr) > + dr->mwi = 1; > + > + return 0; I would rather look up the pci_devres first, e.g., dr = find_pci_dr(dev); if (!dr) return -ENOMEM; dr->mwi = 1; return pci_set_mwi(dev); That way we won't enable MWI and be unable to disable it at release-time. > +} > +EXPORT_SYMBOL(pcim_set_mwi); > + > /** > * pci_try_set_mwi - enables memory-write-invalidate PCI transaction > * @dev: the PCI device for which MWI is enabled > diff --git a/include/linux/pci.h b/include/linux/pci.h > index 978aad784..0a7ac863a 100644 > --- a/include/linux/pci.h > +++ b/include/linux/pci.h > @@ -1064,6 +1064,7 @@ int pci_set_pcie_reset_state(struct pci_dev *dev, enum pcie_reset_state state); > int pci_set_cacheline_size(struct pci_dev *dev); > #define HAVE_PCI_SET_MWI > int __must_check pci_set_mwi(struct pci_dev *dev); > +int __must_check pcim_set_mwi(struct pci_dev *dev); > int pci_try_set_mwi(struct pci_dev *dev); > void pci_clear_mwi(struct pci_dev *dev); > void pci_intx(struct pci_dev *dev, int enable); > -- > 2.15.1 > >
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 4a7c6864f..fc57c378d 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -1458,6 +1458,7 @@ struct pci_devres { unsigned int pinned:1; unsigned int orig_intx:1; unsigned int restore_intx:1; + unsigned int mwi:1; u32 region_mask; }; @@ -1476,6 +1477,9 @@ static void pcim_release(struct device *gendev, void *res) if (this->region_mask & (1 << i)) pci_release_region(dev, i); + if (this->mwi) + pci_clear_mwi(dev); + if (this->restore_intx) pci_intx(dev, this->orig_intx); @@ -3760,6 +3764,31 @@ int pci_set_mwi(struct pci_dev *dev) } EXPORT_SYMBOL(pci_set_mwi); +/** + * pcim_set_mwi - Managed pci_set_mwi() + * @dev: the PCI device for which MWI is enabled + * + * Managed pci_set_mwi(). + * + * RETURNS: An appropriate -ERRNO error value on error, or zero for success. + */ +int pcim_set_mwi(struct pci_dev *dev) +{ + struct pci_devres *dr; + int ret; + + ret = pci_set_mwi(dev); + if (ret) + return ret; + + dr = find_pci_dr(dev); + if (dr) + dr->mwi = 1; + + return 0; +} +EXPORT_SYMBOL(pcim_set_mwi); + /** * pci_try_set_mwi - enables memory-write-invalidate PCI transaction * @dev: the PCI device for which MWI is enabled diff --git a/include/linux/pci.h b/include/linux/pci.h index 978aad784..0a7ac863a 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -1064,6 +1064,7 @@ int pci_set_pcie_reset_state(struct pci_dev *dev, enum pcie_reset_state state); int pci_set_cacheline_size(struct pci_dev *dev); #define HAVE_PCI_SET_MWI int __must_check pci_set_mwi(struct pci_dev *dev); +int __must_check pcim_set_mwi(struct pci_dev *dev); int pci_try_set_mwi(struct pci_dev *dev); void pci_clear_mwi(struct pci_dev *dev); void pci_intx(struct pci_dev *dev, int enable);
Introduce a device-managed version of pci_set_mwi. First user is the Realtek r8169 driver. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> --- drivers/pci/pci.c | 29 +++++++++++++++++++++++++++++ include/linux/pci.h | 1 + 2 files changed, 30 insertions(+)