linux-kernel - [RFC PATCH 1/3] PCI: Add dma-resv window list

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Date:   Wed, 12 Dec 2018 11:16:07 +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>,
        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: [RFC PATCH 1/3] PCI: Add dma-resv window list

Add a dma_resv parameter in pci host bridge structure
to hold resource entries list of memory regions for
which IOVAs has to reserve.

IOMMU framework reserve IOVA for this list of address
range while initializing IOMMU domain of corresponding
PCI EP connected to the HOST.

PCIe host driver will add resource entries to this
list based on requirements.
Few hosts can't use all inbound address, so those
address regions will be add to this list to avoid
IOMMU mapping.

Signed-off-by: Srinath Mannam <srinath.mannam@...adcom.com>
---
 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 ec78400..bbed0e7 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_resv);
 	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_resv);
 	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_resv);
 
 	kfree(bridge);
 }
diff --git a/include/linux/pci.h b/include/linux/pci.h
index e72ca8d..1f0a32a 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -472,6 +472,7 @@ struct pci_host_bridge {
 	void		*sysdata;
 	int		busnr;
 	struct list_head windows;	/* resource_entry */
+	struct list_head dma_resv;	/* reserv dma ranges */
 	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