The Apple PCIe controller doesn't directly feed the endpoint's
Requester ID to the IOMMU (DART), but instead maps RIDs onto
Stream IDs (SIDs). The DART and the PCIe controller must thus
agree on the SIDs that are used for translation (by using
the 'iommu-map' property).

For this purpose, parse the 'iommu-map' property each time a
device gets added, and use the resulting translation to configure
the PCIe RID-to-SID mapper. Similarily, remove the translation
if/when the device gets removed.

This is all driven from a bus notifier which gets registered at
probe time. Hopefully this is the only PCI controller driver
in the whole system.

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 drivers/pci/controller/pcie-apple.c | 158 +++++++++++++++++++++++++++-
 1 file changed, 156 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/controller/pcie-apple.c 

b/drivers/pci/controller/pcie-apple.c
index 76344223245d..68d71eabe708 100644

--- a/drivers/pci/controller/pcie-apple.c
+++ b/drivers/pci/controller/pcie-apple.c

@@ -23,8 +23,10 @@
 #include <linux/iopoll.h>
 #include <linux/irqchip/chained_irq.h>
 #include <linux/irqdomain.h>
+#include <linux/list.h>
 #include <linux/module.h>
 #include <linux/msi.h>
+#include <linux/notifier.h>
 #include <linux/of_irq.h>
 #include <linux/pci-ecam.h>
 

@@ -116,6 +118,8 @@
 #define   PORT_TUNSTAT_PERST_ACK_PEND	BIT(1)
 #define PORT_PREFMEM_ENABLE		0x00994
 
+#define MAX_RID2SID			64