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s390/pci: deal with devices that have no support for MIO instructions 

Unfortunately we have to handle a class of devices that don't support the
new MIO instructions. Adjust resource assignment and mapping accordingly.

Signed-off-by: Sebastian Ott <sebott@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Sebastian Ott 2019-06-27 15:13:05 +02:00 committed by Vasily Gorbik
parent 05f31e3bf6
commit c7ff0e918a
2 changed files with 13 additions and 7 deletions
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5
arch/s390/include/asm/pci.h
View File

@ -194,6 +194,11 @@ int zpci_init_iommu(struct zpci_dev *zdev);
void zpci_destroy_iommu(struct zpci_dev *zdev); void zpci_destroy_iommu(struct zpci_dev *zdev);
#ifdef CONFIG_PCI #ifdef CONFIG_PCI
static inline bool zpci_use_mio(struct zpci_dev *zdev)
{
return static_branch_likely(&have_mio) && zdev->mio_capable;
}
/* Error handling and recovery */ /* Error handling and recovery */
void zpci_event_error(void *); void zpci_event_error(void *);
void zpci_event_availability(void *); void zpci_event_availability(void *);

15
arch/s390/pci/pci.c
View File

@ -421,12 +421,12 @@ static void zpci_map_resources(struct pci_dev *pdev)
if (!len) if (!len)
continue; continue;
if (static_branch_likely(&have_mio)) if (zpci_use_mio(zdev))
pdev->resource[i].start = pdev->resource[i].start =
(resource_size_t __force) zdev->bars[i].mio_wb; (resource_size_t __force) zdev->bars[i].mio_wb;
else else
pdev->resource[i].start = pdev->resource[i].start = (resource_size_t __force)
(resource_size_t __force) pci_iomap(pdev, i, 0); pci_iomap_range_fh(pdev, i, 0, 0);
pdev->resource[i].end = pdev->resource[i].start + len - 1; pdev->resource[i].end = pdev->resource[i].start + len - 1;
} }
@ -444,18 +444,19 @@ static void zpci_map_resources(struct pci_dev *pdev)
static void zpci_unmap_resources(struct pci_dev *pdev) static void zpci_unmap_resources(struct pci_dev *pdev)
{ {
struct zpci_dev *zdev = to_zpci(pdev);
resource_size_t len; resource_size_t len;
int i; int i;
if (static_branch_likely(&have_mio)) if (zpci_use_mio(zdev))
return; return;
for (i = 0; i < PCI_BAR_COUNT; i++) { for (i = 0; i < PCI_BAR_COUNT; i++) {
len = pci_resource_len(pdev, i); len = pci_resource_len(pdev, i);
if (!len) if (!len)
continue; continue;
pci_iounmap(pdev, (void __iomem __force *) pci_iounmap_fh(pdev, (void __iomem __force *)
pdev->resource[i].start); pdev->resource[i].start);
} }
} }
@ -528,7 +529,7 @@ static int zpci_setup_bus_resources(struct zpci_dev *zdev,
if (zdev->bars[i].val & 4) if (zdev->bars[i].val & 4)
flags |= IORESOURCE_MEM_64; flags |= IORESOURCE_MEM_64;
if (static_branch_likely(&have_mio)) if (zpci_use_mio(zdev))
addr = (unsigned long) zdev->bars[i].mio_wb; addr = (unsigned long) zdev->bars[i].mio_wb;
else else
addr = ZPCI_ADDR(entry); addr = ZPCI_ADDR(entry);