| Message ID | 20211206210224.871651518@linutronix.de (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | genirq/msi, PCI/MSI: Spring cleaning - Part 1 | expand |
On Mon, Dec 06, 2021 at 11:27:54PM +0100, Thomas Gleixner wrote: > Unmapping the MSIX base mapping in the loops which allocate/free MSI > desciptors is daft and in the way of allowing runtime expansion of MSI-X > descriptors. s/MSIX/MSI-X/ (subject and first use in commit log) s/desciptors/descriptors/ > Store the mapping in struct pci_dev and free it after freeing the MSI-X > descriptors. > > Signed-off-by: Thomas Gleixner <tglx@linutronix.de> > Tested-by: Juergen Gross <jgross@suse.com> > Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Acked-by: Bjorn Helgaas <bhelgaas@google.com> > --- > drivers/pci/msi/msi.c | 18 ++++++++---------- > include/linux/pci.h | 1 + > 2 files changed, 9 insertions(+), 10 deletions(-) > > --- a/drivers/pci/msi/msi.c > +++ b/drivers/pci/msi/msi.c > @@ -241,14 +241,14 @@ static void free_msi_irqs(struct pci_dev > pci_msi_teardown_msi_irqs(dev); > > list_for_each_entry_safe(entry, tmp, msi_list, list) { > - if (entry->pci.msi_attrib.is_msix) { > - if (list_is_last(&entry->list, msi_list)) > - iounmap(entry->pci.mask_base); > - } > - > list_del(&entry->list); > free_msi_entry(entry); > } > + > + if (dev->msix_base) { > + iounmap(dev->msix_base); > + dev->msix_base = NULL; > + } > } > > static void pci_intx_for_msi(struct pci_dev *dev, int enable) > @@ -501,10 +501,6 @@ static int msix_setup_entries(struct pci > for (i = 0, curmsk = masks; i < nvec; i++) { > entry = alloc_msi_entry(&dev->dev, 1, curmsk); > if (!entry) { > - if (!i) > - iounmap(base); > - else > - free_msi_irqs(dev); > /* No enough memory. Don't try again */ > ret = -ENOMEM; > goto out; > @@ -602,12 +598,14 @@ static int msix_capability_init(struct p > goto out_disable; > } > > + dev->msix_base = base; > + > /* Ensure that all table entries are masked. */ > msix_mask_all(base, tsize); > > ret = msix_setup_entries(dev, base, entries, nvec, affd); > if (ret) > - goto out_disable; > + goto out_free; > > ret = pci_msi_setup_msi_irqs(dev, nvec, PCI_CAP_ID_MSIX); > if (ret) > --- a/include/linux/pci.h > +++ b/include/linux/pci.h > @@ -473,6 +473,7 @@ struct pci_dev { > u8 ptm_granularity; > #endif > #ifdef CONFIG_PCI_MSI > + void __iomem *msix_base; > const struct attribute_group **msi_irq_groups; > #endif > struct pci_vpd vpd; >
--- a/drivers/pci/msi/msi.c +++ b/drivers/pci/msi/msi.c @@ -241,14 +241,14 @@ static void free_msi_irqs(struct pci_dev pci_msi_teardown_msi_irqs(dev); list_for_each_entry_safe(entry, tmp, msi_list, list) { - if (entry->pci.msi_attrib.is_msix) { - if (list_is_last(&entry->list, msi_list)) - iounmap(entry->pci.mask_base); - } - list_del(&entry->list); free_msi_entry(entry); } + + if (dev->msix_base) { + iounmap(dev->msix_base); + dev->msix_base = NULL; + } } static void pci_intx_for_msi(struct pci_dev *dev, int enable) @@ -501,10 +501,6 @@ static int msix_setup_entries(struct pci for (i = 0, curmsk = masks; i < nvec; i++) { entry = alloc_msi_entry(&dev->dev, 1, curmsk); if (!entry) { - if (!i) - iounmap(base); - else - free_msi_irqs(dev); /* No enough memory. Don't try again */ ret = -ENOMEM; goto out; @@ -602,12 +598,14 @@ static int msix_capability_init(struct p goto out_disable; } + dev->msix_base = base; + /* Ensure that all table entries are masked. */ msix_mask_all(base, tsize); ret = msix_setup_entries(dev, base, entries, nvec, affd); if (ret) - goto out_disable; + goto out_free; ret = pci_msi_setup_msi_irqs(dev, nvec, PCI_CAP_ID_MSIX); if (ret) --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -473,6 +473,7 @@ struct pci_dev { u8 ptm_granularity; #endif #ifdef CONFIG_PCI_MSI + void __iomem *msix_base; const struct attribute_group **msi_irq_groups; #endif struct pci_vpd vpd;