| Message ID | 1005232855c3af2c0c669818ee63be445389b6ad.1405160163.git.agordeev@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
> /** > - * pci_msi_check_device - check whether MSI may be enabled on a device > + * msi_check_device - check whether MSI may be enabled on a device > * @dev: pointer to the pci_dev data structure of MSI device function > * @nvec: how many MSIs have been requested ? > - * @type: are we checking for MSI or MSI-X ? > * > * Look at global flags, the device itself, and its parent buses > * to determine if MSI/-X are supported for the device. If MSI/-X is > * supported return 0, else return an error code. > **/ > -static int pci_msi_check_device(struct pci_dev *dev, int nvec, int type) > +static int msi_check_device(struct pci_dev *dev, int nvec) > { > struct pci_bus *bus; > - int ret; > > /* MSI must be globally enabled and supported by the device */ > - if (!pci_msi_enable || !dev || dev->no_msi) > + if (!pci_msi_enable) > + return -EINVAL; > + > + if (!dev || dev->no_msi || dev->current_state != PCI_D0) > return -EINVAL; > > /* > @@ -846,10 +837,6 @@ static int pci_msi_check_device(struct pci_dev *dev, int nvec, int type) > if (bus->bus_flags & PCI_BUS_FLAGS_NO_MSI) > return -EINVAL; > > - ret = arch_msi_check_device(dev, nvec, type); > - if (ret) > - return ret; > - Move the arch_msi_check_device() into arch_msi_setup_irq(), make we can not detect whether the device in this platform supports MSI or MSI-X aeap. If we delay this, maybe we will do a lot unnecessary working for MSI/MSI-X setup. Thanks! Yijing. > return 0; > } > > @@ -954,13 +941,13 @@ int pci_enable_msix(struct pci_dev *dev, struct msix_entry *entries, int nvec) > int status, nr_entries; > int i, j; > > - if (!entries || !dev->msix_cap || dev->current_state != PCI_D0) > - return -EINVAL; > - > - status = pci_msi_check_device(dev, nvec, PCI_CAP_ID_MSIX); > + status = msi_check_device(dev, nvec); > if (status) > return status; > > + if (!entries) > + return -EINVAL; > + > nr_entries = pci_msix_vec_count(dev); > if (nr_entries < 0) > return nr_entries; > @@ -1085,8 +1072,9 @@ int pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec) > int nvec; > int rc; > > - if (dev->current_state != PCI_D0) > - return -EINVAL; > + rc = msi_check_device(dev, minvec); > + if (rc) > + return rc; > > WARN_ON(!!dev->msi_enabled); > > @@ -1109,17 +1097,6 @@ int pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec) > nvec = maxvec; > > do { > - rc = pci_msi_check_device(dev, nvec, PCI_CAP_ID_MSI); > - if (rc < 0) { > - return rc; > - } else if (rc > 0) { > - if (rc < minvec) > - return -ENOSPC; > - nvec = rc; > - } > - } while (rc); > - > - do { > rc = msi_capability_init(dev, nvec); > if (rc < 0) { > return rc; > diff --git a/include/linux/msi.h b/include/linux/msi.h > index 92a2f99..3b873bc 100644 > --- a/include/linux/msi.h > +++ b/include/linux/msi.h > @@ -59,7 +59,6 @@ int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc); > void arch_teardown_msi_irq(unsigned int irq); > int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type); > void arch_teardown_msi_irqs(struct pci_dev *dev); > -int arch_msi_check_device(struct pci_dev* dev, int nvec, int type); > void arch_restore_msi_irqs(struct pci_dev *dev); > > void default_teardown_msi_irqs(struct pci_dev *dev); > @@ -76,8 +75,6 @@ struct msi_chip { > int (*setup_irq)(struct msi_chip *chip, struct pci_dev *dev, > struct msi_desc *desc); > void (*teardown_irq)(struct msi_chip *chip, unsigned int irq); > - int (*check_device)(struct msi_chip *chip, struct pci_dev *dev, > - int nvec, int type); > }; > > #endif /* LINUX_MSI_H */ >
On Mon, Jul 14, 2014 at 10:11:57AM +0800, Yijing Wang wrote: > > /** > > - * pci_msi_check_device - check whether MSI may be enabled on a device > > + * msi_check_device - check whether MSI may be enabled on a device > > * @dev: pointer to the pci_dev data structure of MSI device function > > * @nvec: how many MSIs have been requested ? > > - * @type: are we checking for MSI or MSI-X ? > > * > > * Look at global flags, the device itself, and its parent buses > > * to determine if MSI/-X are supported for the device. If MSI/-X is > > * supported return 0, else return an error code. > > **/ > > -static int pci_msi_check_device(struct pci_dev *dev, int nvec, int type) > > +static int msi_check_device(struct pci_dev *dev, int nvec) > > { > > struct pci_bus *bus; > > - int ret; > > > > /* MSI must be globally enabled and supported by the device */ > > - if (!pci_msi_enable || !dev || dev->no_msi) > > + if (!pci_msi_enable) > > + return -EINVAL; > > + > > + if (!dev || dev->no_msi || dev->current_state != PCI_D0) > > return -EINVAL; > > > > /* > > @@ -846,10 +837,6 @@ static int pci_msi_check_device(struct pci_dev *dev, int nvec, int type) > > if (bus->bus_flags & PCI_BUS_FLAGS_NO_MSI) > > return -EINVAL; > > > > - ret = arch_msi_check_device(dev, nvec, type); > > - if (ret) > > - return ret; > > - > > Move the arch_msi_check_device() into arch_msi_setup_irq(), make we can not detect whether the device in this platform > supports MSI or MSI-X aeap. If we delay this, maybe we will do a lot unnecessary working for MSI/MSI-X setup. A traditional approach for a function is first to make sanity check and then allocate resources. I do not see a reason to keep these two steps in separate functions: arch_msi_check_device() and arch_setup_msi_irq(). Just make checks within arch_setup_msi_irq() and bail out early would be as cheap as it is now, but more natural and would deflate the interface. Moreover, some platforms duplicate checks in arch_msi_check_device() and arch_setup_msi_irq(), which does not add to readability. > Thanks! > Yijing. > > > return 0; > > } > > > > @@ -954,13 +941,13 @@ int pci_enable_msix(struct pci_dev *dev, struct msix_entry *entries, int nvec) > > int status, nr_entries; > > int i, j; > > > > - if (!entries || !dev->msix_cap || dev->current_state != PCI_D0) > > - return -EINVAL; > > - > > - status = pci_msi_check_device(dev, nvec, PCI_CAP_ID_MSIX); > > + status = msi_check_device(dev, nvec); > > if (status) > > return status; > > > > + if (!entries) > > + return -EINVAL; > > + > > nr_entries = pci_msix_vec_count(dev); > > if (nr_entries < 0) > > return nr_entries; > > @@ -1085,8 +1072,9 @@ int pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec) > > int nvec; > > int rc; > > > > - if (dev->current_state != PCI_D0) > > - return -EINVAL; > > + rc = msi_check_device(dev, minvec); > > + if (rc) > > + return rc; > > > > WARN_ON(!!dev->msi_enabled); > > > > @@ -1109,17 +1097,6 @@ int pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec) > > nvec = maxvec; > > > > do { > > - rc = pci_msi_check_device(dev, nvec, PCI_CAP_ID_MSI); > > - if (rc < 0) { > > - return rc; > > - } else if (rc > 0) { > > - if (rc < minvec) > > - return -ENOSPC; > > - nvec = rc; > > - } > > - } while (rc); > > - > > - do { > > rc = msi_capability_init(dev, nvec); > > if (rc < 0) { > > return rc; > > diff --git a/include/linux/msi.h b/include/linux/msi.h > > index 92a2f99..3b873bc 100644 > > --- a/include/linux/msi.h > > +++ b/include/linux/msi.h > > @@ -59,7 +59,6 @@ int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc); > > void arch_teardown_msi_irq(unsigned int irq); > > int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type); > > void arch_teardown_msi_irqs(struct pci_dev *dev); > > -int arch_msi_check_device(struct pci_dev* dev, int nvec, int type); > > void arch_restore_msi_irqs(struct pci_dev *dev); > > > > void default_teardown_msi_irqs(struct pci_dev *dev); > > @@ -76,8 +75,6 @@ struct msi_chip { > > int (*setup_irq)(struct msi_chip *chip, struct pci_dev *dev, > > struct msi_desc *desc); > > void (*teardown_irq)(struct msi_chip *chip, unsigned int irq); > > - int (*check_device)(struct msi_chip *chip, struct pci_dev *dev, > > - int nvec, int type); > > }; > > > > #endif /* LINUX_MSI_H */ > > > > > -- > Thanks! > Yijing >
On Sat, Jul 12, 2014 at 01:21:08PM +0200, Alexander Gordeev wrote: > There are no archs that override arch_msi_check_device() > hook. Remove it as it is completely redundant. > > If an arch would need to check MSI/MSI-X possibility for a > device it should make it within arch_setup_msi_irqs() hook. > > Cc: linuxppc-dev@lists.ozlabs.org > Cc: linux-pci@vger.kernel.org > Signed-off-by: Alexander Gordeev <agordeev@redhat.com> > --- > drivers/pci/msi.c | 49 +++++++++++++------------------------------------ > include/linux/msi.h | 3 --- > 2 files changed, 13 insertions(+), 39 deletions(-) > > diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c > index 13f3d30..19ac058 100644 > --- a/drivers/pci/msi.c > +++ b/drivers/pci/msi.c > @@ -56,16 +56,6 @@ void __weak arch_teardown_msi_irq(unsigned int irq) > chip->teardown_irq(chip, irq); > } > > -int __weak arch_msi_check_device(struct pci_dev *dev, int nvec, int type) > -{ > - struct msi_chip *chip = dev->bus->msi; > - > - if (!chip || !chip->check_device) > - return 0; > - > - return chip->check_device(chip, dev, nvec, type); > -} > - > int __weak arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type) > { > struct msi_desc *entry; > @@ -809,22 +799,23 @@ out_free: > } > > /** > - * pci_msi_check_device - check whether MSI may be enabled on a device > + * msi_check_device - check whether MSI may be enabled on a device > * @dev: pointer to the pci_dev data structure of MSI device function > * @nvec: how many MSIs have been requested ? > - * @type: are we checking for MSI or MSI-X ? > * > * Look at global flags, the device itself, and its parent buses > * to determine if MSI/-X are supported for the device. If MSI/-X is > * supported return 0, else return an error code. > **/ > -static int pci_msi_check_device(struct pci_dev *dev, int nvec, int type) > +static int msi_check_device(struct pci_dev *dev, int nvec) I think "check_device" is a terrible name because it really doesn't give a clue about what it's doing or what the return value means. Since you're removing the external usage (arch_msi_check_device) and this one is static, this would be a good time to fix it. Maybe "pci_msi_supported()" or something? I *love* the idea of getting rid of this much code! Bjorn -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Wed, Jul 16, 2014 at 04:20:24PM -0600, Bjorn Helgaas wrote: > > @@ -809,22 +799,23 @@ out_free: > > } > > > > /** > > - * pci_msi_check_device - check whether MSI may be enabled on a device > > + * msi_check_device - check whether MSI may be enabled on a device > > * @dev: pointer to the pci_dev data structure of MSI device function > > * @nvec: how many MSIs have been requested ? > > - * @type: are we checking for MSI or MSI-X ? > > * > > * Look at global flags, the device itself, and its parent buses > > * to determine if MSI/-X are supported for the device. If MSI/-X is > > * supported return 0, else return an error code. > > **/ > > -static int pci_msi_check_device(struct pci_dev *dev, int nvec, int type) > > +static int msi_check_device(struct pci_dev *dev, int nvec) > > I think "check_device" is a terrible name because it really doesn't > give a clue about what it's doing or what the return value means. > Since you're removing the external usage (arch_msi_check_device) and > this one is static, this would be a good time to fix it. Maybe > "pci_msi_supported()" or something? What about pci_can_enable_msi() or pci_msi_can_enable() or msi_can_enable()? > I *love* the idea of getting rid of this much code! > > Bjorn
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index 13f3d30..19ac058 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -56,16 +56,6 @@ void __weak arch_teardown_msi_irq(unsigned int irq) chip->teardown_irq(chip, irq); } -int __weak arch_msi_check_device(struct pci_dev *dev, int nvec, int type) -{ - struct msi_chip *chip = dev->bus->msi; - - if (!chip || !chip->check_device) - return 0; - - return chip->check_device(chip, dev, nvec, type); -} - int __weak arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type) { struct msi_desc *entry; @@ -809,22 +799,23 @@ out_free: } /** - * pci_msi_check_device - check whether MSI may be enabled on a device + * msi_check_device - check whether MSI may be enabled on a device * @dev: pointer to the pci_dev data structure of MSI device function * @nvec: how many MSIs have been requested ? - * @type: are we checking for MSI or MSI-X ? * * Look at global flags, the device itself, and its parent buses * to determine if MSI/-X are supported for the device. If MSI/-X is * supported return 0, else return an error code. **/ -static int pci_msi_check_device(struct pci_dev *dev, int nvec, int type) +static int msi_check_device(struct pci_dev *dev, int nvec) { struct pci_bus *bus; - int ret; /* MSI must be globally enabled and supported by the device */ - if (!pci_msi_enable || !dev || dev->no_msi) + if (!pci_msi_enable) + return -EINVAL; + + if (!dev || dev->no_msi || dev->current_state != PCI_D0) return -EINVAL; /* @@ -846,10 +837,6 @@ static int pci_msi_check_device(struct pci_dev *dev, int nvec, int type) if (bus->bus_flags & PCI_BUS_FLAGS_NO_MSI) return -EINVAL; - ret = arch_msi_check_device(dev, nvec, type); - if (ret) - return ret; - return 0; } @@ -954,13 +941,13 @@ int pci_enable_msix(struct pci_dev *dev, struct msix_entry *entries, int nvec) int status, nr_entries; int i, j; - if (!entries || !dev->msix_cap || dev->current_state != PCI_D0) - return -EINVAL; - - status = pci_msi_check_device(dev, nvec, PCI_CAP_ID_MSIX); + status = msi_check_device(dev, nvec); if (status) return status; + if (!entries) + return -EINVAL; + nr_entries = pci_msix_vec_count(dev); if (nr_entries < 0) return nr_entries; @@ -1085,8 +1072,9 @@ int pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec) int nvec; int rc; - if (dev->current_state != PCI_D0) - return -EINVAL; + rc = msi_check_device(dev, minvec); + if (rc) + return rc; WARN_ON(!!dev->msi_enabled); @@ -1109,17 +1097,6 @@ int pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec) nvec = maxvec; do { - rc = pci_msi_check_device(dev, nvec, PCI_CAP_ID_MSI); - if (rc < 0) { - return rc; - } else if (rc > 0) { - if (rc < minvec) - return -ENOSPC; - nvec = rc; - } - } while (rc); - - do { rc = msi_capability_init(dev, nvec); if (rc < 0) { return rc; diff --git a/include/linux/msi.h b/include/linux/msi.h index 92a2f99..3b873bc 100644 --- a/include/linux/msi.h +++ b/include/linux/msi.h @@ -59,7 +59,6 @@ int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc); void arch_teardown_msi_irq(unsigned int irq); int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type); void arch_teardown_msi_irqs(struct pci_dev *dev); -int arch_msi_check_device(struct pci_dev* dev, int nvec, int type); void arch_restore_msi_irqs(struct pci_dev *dev); void default_teardown_msi_irqs(struct pci_dev *dev); @@ -76,8 +75,6 @@ struct msi_chip { int (*setup_irq)(struct msi_chip *chip, struct pci_dev *dev, struct msi_desc *desc); void (*teardown_irq)(struct msi_chip *chip, unsigned int irq); - int (*check_device)(struct msi_chip *chip, struct pci_dev *dev, - int nvec, int type); }; #endif /* LINUX_MSI_H */
There are no archs that override arch_msi_check_device() hook. Remove it as it is completely redundant. If an arch would need to check MSI/MSI-X possibility for a device it should make it within arch_setup_msi_irqs() hook. Cc: linuxppc-dev@lists.ozlabs.org Cc: linux-pci@vger.kernel.org Signed-off-by: Alexander Gordeev <agordeev@redhat.com> --- drivers/pci/msi.c | 49 +++++++++++++------------------------------------ include/linux/msi.h | 3 --- 2 files changed, 13 insertions(+), 39 deletions(-)