| Message ID | 1421256142-11512-11-git-send-email-mst@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
On Wed, 14 Jan 2015, Michael S. Tsirkin wrote: > Virtio drivers should map the part of the range they need, not > necessarily all of it. > To this end, support mapping ranges within BAR on s390. > Since multiple ranges can now be mapped within a BAR, we keep track of > the number of mappings created, and only clear out the mapping for a BAR > when this number reaches 0. > > Cc: Bjorn Helgaas <bhelgaas@google.com> > Cc: linux-pci@vger.kernel.org > Tested-by: Sebastian Ott <sebott@linux.vnet.ibm.com> > Signed-off-by: Michael S. Tsirkin <mst@redhat.com> > --- > > Heiko, Martin, can you please ack merging this through the virtio tree? > This was lightly tested by Sebastian Ott. > > arch/s390/include/asm/pci_io.h | 1 + > arch/s390/pci/pci.c | 34 +++++++++++++++++++++++++++------- > 2 files changed, 28 insertions(+), 7 deletions(-) > > diff --git a/arch/s390/include/asm/pci_io.h b/arch/s390/include/asm/pci_io.h > index f664e96..1a9a98d 100644 > --- a/arch/s390/include/asm/pci_io.h > +++ b/arch/s390/include/asm/pci_io.h > @@ -16,6 +16,7 @@ > struct zpci_iomap_entry { > u32 fh; > u8 bar; > + u16 count; > }; > > extern struct zpci_iomap_entry *zpci_iomap_start; > diff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c > index 3290f11..753a567 100644 > --- a/arch/s390/pci/pci.c > +++ b/arch/s390/pci/pci.c > @@ -259,7 +259,10 @@ void __iowrite64_copy(void __iomem *to, const void *from, size_t count) > } > > /* Create a virtual mapping cookie for a PCI BAR */ > -void __iomem *pci_iomap(struct pci_dev *pdev, int bar, unsigned long max) > +void __iomem *pci_iomap_range(struct pci_dev *pdev, > + int bar, > + unsigned long offset, > + unsigned long max) > { > struct zpci_dev *zdev = get_zdev(pdev); > u64 addr; > @@ -270,14 +273,27 @@ void __iomem *pci_iomap(struct pci_dev *pdev, int bar, unsigned long max) > > idx = zdev->bars[bar].map_idx; > spin_lock(&zpci_iomap_lock); > - zpci_iomap_start[idx].fh = zdev->fh; > - zpci_iomap_start[idx].bar = bar; > + if (zpci_iomap_start[idx].count++) { > + BUG_ON(zpci_iomap_start[idx].fh != zdev->fh || > + zpci_iomap_start[idx].bar != bar); > + } else { > + zpci_iomap_start[idx].fh = zdev->fh; > + zpci_iomap_start[idx].bar = bar; > + } > + /* Detect overrun */ > + BUG_ON(!zpci_iomap_start[idx].count); > spin_unlock(&zpci_iomap_lock); > > addr = ZPCI_IOMAP_ADDR_BASE | ((u64) idx << 48); > - return (void __iomem *) addr; > + return (void __iomem *) addr + offset; > } > -EXPORT_SYMBOL_GPL(pci_iomap); > +EXPORT_SYMBOL_GPL(pci_iomap_range); > + > +void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen) > +{ > + return pci_iomap_range(dev, bar, 0, maxlen); > +} > +EXPORT_SYMBOL(pci_iomap); As discussed earlier, could you please leave that as EXPORT_SYMBOL_GPL. If there's a reason to have these interfaces as EXPORT_SYMBOL, we could change all of them in an extra patch. With this change integrated you can add Acked-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Regards, Sebastian > > void pci_iounmap(struct pci_dev *pdev, void __iomem *addr) > { > @@ -285,8 +301,12 @@ void pci_iounmap(struct pci_dev *pdev, void __iomem *addr) > > idx = (((__force u64) addr) & ~ZPCI_IOMAP_ADDR_BASE) >> 48; > spin_lock(&zpci_iomap_lock); > - zpci_iomap_start[idx].fh = 0; > - zpci_iomap_start[idx].bar = 0; > + /* Detect underrun */ > + BUG_ON(!zpci_iomap_start[idx].count); > + if (!--zpci_iomap_start[idx].count) { > + zpci_iomap_start[idx].fh = 0; > + zpci_iomap_start[idx].bar = 0; > + } > spin_unlock(&zpci_iomap_lock); > } > EXPORT_SYMBOL_GPL(pci_iounmap); > -- > MST > > -- 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
Sebastian Ott <sebott@linux.vnet.ibm.com> writes: > On Wed, 14 Jan 2015, Michael S. Tsirkin wrote: >> } >> -EXPORT_SYMBOL_GPL(pci_iomap); >> +EXPORT_SYMBOL_GPL(pci_iomap_range); >> + >> +void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen) >> +{ >> + return pci_iomap_range(dev, bar, 0, maxlen); >> +} >> +EXPORT_SYMBOL(pci_iomap); > > As discussed earlier, could you please leave that as EXPORT_SYMBOL_GPL. > If there's a reason to have these interfaces as EXPORT_SYMBOL, we could > change all of them in an extra patch. > > With this change integrated you can add > Acked-by: Sebastian Ott <sebott@linux.vnet.ibm.com> OK, I've gone back and rebased virtio-next to fix this (I don't really want to think too hard about the legal consequences of having a version which isn't EXPORT_SYMBOL_GPL). Thanks, Rusty. -- 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
diff --git a/arch/s390/include/asm/pci_io.h b/arch/s390/include/asm/pci_io.h index f664e96..1a9a98d 100644 --- a/arch/s390/include/asm/pci_io.h +++ b/arch/s390/include/asm/pci_io.h @@ -16,6 +16,7 @@ struct zpci_iomap_entry { u32 fh; u8 bar; + u16 count; }; extern struct zpci_iomap_entry *zpci_iomap_start; diff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c index 3290f11..753a567 100644 --- a/arch/s390/pci/pci.c +++ b/arch/s390/pci/pci.c @@ -259,7 +259,10 @@ void __iowrite64_copy(void __iomem *to, const void *from, size_t count) } /* Create a virtual mapping cookie for a PCI BAR */ -void __iomem *pci_iomap(struct pci_dev *pdev, int bar, unsigned long max) +void __iomem *pci_iomap_range(struct pci_dev *pdev, + int bar, + unsigned long offset, + unsigned long max) { struct zpci_dev *zdev = get_zdev(pdev); u64 addr; @@ -270,14 +273,27 @@ void __iomem *pci_iomap(struct pci_dev *pdev, int bar, unsigned long max) idx = zdev->bars[bar].map_idx; spin_lock(&zpci_iomap_lock); - zpci_iomap_start[idx].fh = zdev->fh; - zpci_iomap_start[idx].bar = bar; + if (zpci_iomap_start[idx].count++) { + BUG_ON(zpci_iomap_start[idx].fh != zdev->fh || + zpci_iomap_start[idx].bar != bar); + } else { + zpci_iomap_start[idx].fh = zdev->fh; + zpci_iomap_start[idx].bar = bar; + } + /* Detect overrun */ + BUG_ON(!zpci_iomap_start[idx].count); spin_unlock(&zpci_iomap_lock); addr = ZPCI_IOMAP_ADDR_BASE | ((u64) idx << 48); - return (void __iomem *) addr; + return (void __iomem *) addr + offset; } -EXPORT_SYMBOL_GPL(pci_iomap); +EXPORT_SYMBOL_GPL(pci_iomap_range); + +void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen) +{ + return pci_iomap_range(dev, bar, 0, maxlen); +} +EXPORT_SYMBOL(pci_iomap); void pci_iounmap(struct pci_dev *pdev, void __iomem *addr) { @@ -285,8 +301,12 @@ void pci_iounmap(struct pci_dev *pdev, void __iomem *addr) idx = (((__force u64) addr) & ~ZPCI_IOMAP_ADDR_BASE) >> 48; spin_lock(&zpci_iomap_lock); - zpci_iomap_start[idx].fh = 0; - zpci_iomap_start[idx].bar = 0; + /* Detect underrun */ + BUG_ON(!zpci_iomap_start[idx].count); + if (!--zpci_iomap_start[idx].count) { + zpci_iomap_start[idx].fh = 0; + zpci_iomap_start[idx].bar = 0; + } spin_unlock(&zpci_iomap_lock); } EXPORT_SYMBOL_GPL(pci_iounmap);