linux-kernel - [PATCH v4 1/3] PCI: Add dma

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Date:   Fri, 12 Apr 2019 08:43:33 +0530
From:   Srinath Mannam <srinath.mannam@...adcom.com>
To:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        poza@...eaurora.org, Ray Jui <rjui@...adcom.com>
Cc:     bcm-kernel-feedback-list@...adcom.com, linux-pci@...r.kernel.org,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Srinath Mannam <srinath.mannam@...adcom.com>
Subject: [PATCH v4 1/3] 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 given through dma-ranges
DT property.

While initializing IOMMU domain of PCI EPs connected to that host bridge
This list of resources will be processed and IOVAs for the address holes
will be reserved.

Signed-off-by: Srinath Mannam <srinath.mannam@...adcom.com>
Based-on-patch-by: Oza Pawandeep <oza.oza@...adcom.com>
Reviewed-by: Oza Pawandeep <poza@...eaurora.org>
---
 drivers/pci/probe.c | 3 +++
 include/linux/pci.h | 1 +
 2 files changed, 4 insertions(+)

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 257b9f6..ce5505f 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -544,6 +544,7 @@ 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;
 
 	/*
@@ -572,6 +573,7 @@ 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;
@@ -581,6 +583,7 @@ 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 65f1d8c..016a044 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -487,6 +487,7 @@ 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 *);
-- 
2.7.4