On some platforms (in this case ARM64), the PCI iospace needs to
be mapped with pci_remap_iospace and the resources have to be
adjusted for the iospace physical address.
This has to be done before acpi_pci_root_validate_resources()
checks and removes resource windows. Handle this by adding
a function acpi_pci_root_remap_iospace that is called in
acpi_pci_probe_root_resources(), before the validate call.
Also fix the address check in acpi_dev_ioresource_flags for
similar platforms.
Signed-off-by: Jayachandran C <jchandra@xxxxxxxxxxxx>
---
drivers/acpi/pci_root.c | 62 +++++++++++++++++++++++++++++++++++++++++++++++--
drivers/acpi/resource.c | 2 ++
2 files changed, 62 insertions(+), 2 deletions(-)
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index ae3fe4e..fcaa484 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -720,6 +720,61 @@ next:
}
}
+#ifdef PCI_IOBASE
+/*
+ * The IO ports are mapped to a memory range, fixup IO resources to
+ * handle that
+ */
+static int acpi_pci_root_remap_iospace(struct acpi_pci_root_info *ci)
+{
+ struct resource_entry *entry;
+ struct resource iores;
+ resource_size_t iostart;
+ int err;
+
+ iores.flags = IORESOURCE_IO;
+ iores.start = (resource_size_t)-1;
+ iores.end = 0;
+ resource_list_for_each_entry(entry, &ci->resources) {
+ if (entry->res->flags & IORESOURCE_IO) {
+ iores.start = min(entry->res->start, iores.start);
+ iores.end = max(entry->res->end, iores.end);
+ }
+ }
+ if (iores.end == 0)
+ return 0;
+ iostart = iores.start;
+
+ resource_list_for_each_entry(entry, &ci->resources) {
+ if (entry->res->flags & IORESOURCE_IO) {
+ entry->res->start -= iostart;
+ entry->res->end -= iostart;
+ entry->offset -= iostart;
+ }
+ }
+ iores.start -= iostart;
+ iores.end -= iostart;
+
+ err = pci_remap_iospace(&iores, iostart);
+ if (err) {
+ pr_err("PCI: ACPI: err %d mapping IO %pR\n", err, &iores);
+ return -ENODEV;
+ }
+ pr_info(PREFIX "Mapped %pR at %#lx for IO.\n",
+ &iores, (unsigned long)iostart);
+ return 0;
+}
+#else
+/*
+ * The IO ports are mapped to a memory range, fixup IO resources to
+ * handle that
+ */
+static int acpi_pci_root_remap_iospace(struct acpi_pci_root_info *ci)
+{
+ return 0;
+}
+#endif /* PCI_IOBASE */
+
int acpi_pci_probe_root_resources(struct acpi_pci_root_info *info)
{
int ret;
@@ -745,10 +800,13 @@ int acpi_pci_probe_root_resources(struct acpi_pci_root_info *info)
else
entry->res->name = info->name;
}
- acpi_pci_root_validate_resources(&device->dev, list,
+ ret = acpi_pci_root_remap_iospace(info);
+ if (ret >= 0) {
+ acpi_pci_root_validate_resources(&device->dev, list,
IORESOURCE_MEM);
- acpi_pci_root_validate_resources(&device->dev, list,
+ acpi_pci_root_validate_resources(&device->dev, list,
IORESOURCE_IO);
+ }
}
return ret;
diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c
index cdc5c25..530cad4 100644
--- a/drivers/acpi/resource.c
+++ b/drivers/acpi/resource.c
@@ -126,8 +126,10 @@ static void acpi_dev_ioresource_flags(struct resource *res, u64 len,
if (!acpi_dev_resource_len_valid(res->start, res->end, len, true))
res->flags |= IORESOURCE_DISABLED | IORESOURCE_UNSET;
+#ifndef PCI_IOBASE
if (res->end >= 0x10003)
res->flags |= IORESOURCE_DISABLED | IORESOURCE_UNSET;
+#endif
if (io_decode == ACPI_DECODE_16)
res->flags |= IORESOURCE_IO_16BIT_ADDR;
--
1.9.1
--
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