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Subject[PATCH] uio: uio_pci_generic: add memory resource mappings
Date
import memory resources from underlying pci device, thus allowing
userspace applications to memory map those resources.

Signed-off-by: Firas Ashkar <firas.ashkar@savoirfairelinux.com>
---
:100644 100644 c7d681fef198 efc43869131d M drivers/uio/uio_pci_generic.c
drivers/uio/uio_pci_generic.c | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)

diff --git a/drivers/uio/uio_pci_generic.c b/drivers/uio/uio_pci_generic.c
index c7d681fef198..efc43869131d 100644
--- a/drivers/uio/uio_pci_generic.c
+++ b/drivers/uio/uio_pci_generic.c
@@ -72,7 +72,9 @@ static int probe(struct pci_dev *pdev,
const struct pci_device_id *id)
{
struct uio_pci_generic_dev *gdev;
+ struct uio_mem *uiomem;
int err;
+ int i;

err = pcim_enable_device(pdev);
if (err) {
@@ -101,6 +103,36 @@ static int probe(struct pci_dev *pdev,
"no support for interrupts?\n");
}

+ uiomem = &gdev->info.mem[0];
+ for (i = 0; i < MAX_UIO_MAPS; ++i) {
+ struct resource *r = &pdev->resource[i];
+
+ if (r->flags != (IORESOURCE_SIZEALIGN | IORESOURCE_MEM))
+ continue;
+
+ if (uiomem >= &gdev->info.mem[MAX_UIO_MAPS]) {
+ dev_warn(
+ &pdev->dev,
+ "device has more than " __stringify(
+ MAX_UIO_MAPS) " I/O memory resources.\n");
+ break;
+ }
+
+ uiomem->memtype = UIO_MEM_PHYS;
+ uiomem->addr = r->start & PAGE_MASK;
+ uiomem->offs = r->start & ~PAGE_MASK;
+ uiomem->size =
+ (uiomem->offs + resource_size(r) + PAGE_SIZE - 1) &
+ PAGE_MASK;
+ uiomem->name = r->name;
+ ++uiomem;
+ }
+
+ while (uiomem < &gdev->info.mem[MAX_UIO_MAPS]) {
+ uiomem->size = 0;
+ ++uiomem;
+ }
+
return devm_uio_register_device(&pdev->dev, &gdev->info);
}

--
2.25.1
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