PCI: Add dma_ranges window list

Add a dma_ranges field in PCI host bridge structure to hold resource
entries list of memory regions in sorted order representing memory ranges
that can be accessed through DMA transactions.

Based-on-a-patch-by: Oza Pawandeep <oza.oza@broadcom.com>
Signed-off-by: Srinath Mannam <srinath.mannam@broadcom.com>
[lorenzo.pieralisi@arm.com: updated commit log]
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Oza Pawandeep <poza@codeaurora.org>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 2ec0df0..2a65108 100644 (file)
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -595,6 +595,7 @@ struct pci_host_bridge *pci_alloc_host_bridge(size_t priv)
                return NULL;
 
        INIT_LIST_HEAD(&bridge->windows);
+       INIT_LIST_HEAD(&bridge->dma_ranges);
        bridge->dev.release = pci_release_host_bridge_dev;
 
        /*
@@ -623,6 +624,7 @@ struct pci_host_bridge *devm_pci_alloc_host_bridge(struct device *dev,
                return NULL;
 
        INIT_LIST_HEAD(&bridge->windows);
+       INIT_LIST_HEAD(&bridge->dma_ranges);
        bridge->dev.release = devm_pci_release_host_bridge_dev;
 
        return bridge;
@@ -632,6 +634,7 @@ EXPORT_SYMBOL(devm_pci_alloc_host_bridge);
 void pci_free_host_bridge(struct pci_host_bridge *bridge)
 {
        pci_free_resource_list(&bridge->windows);
+       pci_free_resource_list(&bridge->dma_ranges);
 
        kfree(bridge);
 }

diff --git a/include/linux/pci.h b/include/linux/pci.h
index 7744821..bba0a29 100644 (file)
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -490,6 +490,7 @@ struct pci_host_bridge {
        void            *sysdata;
        int             busnr;
        struct list_head windows;       /* resource_entry */
+       struct list_head dma_ranges;    /* dma ranges resource list */
        u8 (*swizzle_irq)(struct pci_dev *, u8 *); /* Platform IRQ swizzler */
        int (*map_irq)(const struct pci_dev *, u8, u8);
        void (*release_fn)(struct pci_host_bridge *);