From: James Sewart <jamessew...@arista.com>

[ Upstream commit 09298542cd891b43778db1f65aa3613aa5a562eb ]

Add a "nr_devfns" parameter to pci_add_dma_alias() so it can be used to
create DMA aliases for a range of devfns.

[bhelgaas: incorporate nr_devfns fix from James, update
quirk_pex_vca_alias() and setup_aliases()]
Signed-off-by: James Sewart <jamessew...@arista.com>
Signed-off-by: Bjorn Helgaas <bhelg...@google.com>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 drivers/iommu/amd_iommu.c |  7 ++-----
 drivers/pci/pci.c         | 22 +++++++++++++++++-----
 drivers/pci/quirks.c      | 23 +++++++++--------------
 include/linux/pci.h       |  2 +-
 4 files changed, 29 insertions(+), 25 deletions(-)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index bd25674ee4dba..7a6c056b9b9cc 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -230,11 +230,8 @@ static struct pci_dev *setup_aliases(struct device *dev)
         */
        ivrs_alias = amd_iommu_alias_table[pci_dev_id(pdev)];
        if (ivrs_alias != pci_dev_id(pdev) &&
-           PCI_BUS_NUM(ivrs_alias) == pdev->bus->number) {
-               pci_add_dma_alias(pdev, ivrs_alias & 0xff);
-               pci_info(pdev, "Added PCI DMA alias %02x.%d\n",
-                       PCI_SLOT(ivrs_alias), PCI_FUNC(ivrs_alias));
-       }
+           PCI_BUS_NUM(ivrs_alias) == pdev->bus->number)
+               pci_add_dma_alias(pdev, ivrs_alias & 0xff, 1);
 
        clone_aliases(pdev);
 
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 7b5fa2eabe095..951099279192d 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -5998,7 +5998,8 @@ EXPORT_SYMBOL_GPL(pci_pr3_present);
 /**
  * pci_add_dma_alias - Add a DMA devfn alias for a device
  * @dev: the PCI device for which alias is added
- * @devfn: alias slot and function
+ * @devfn_from: alias slot and function
+ * @nr_devfns: number of subsequent devfns to alias
  *
  * This helper encodes an 8-bit devfn as a bit number in dma_alias_mask
  * which is used to program permissible bus-devfn source addresses for DMA
@@ -6014,8 +6015,13 @@ EXPORT_SYMBOL_GPL(pci_pr3_present);
  * cannot be left as a userspace activity).  DMA aliases should therefore
  * be configured via quirks, such as the PCI fixup header quirk.
  */
-void pci_add_dma_alias(struct pci_dev *dev, u8 devfn)
+void pci_add_dma_alias(struct pci_dev *dev, u8 devfn_from, unsigned nr_devfns)
 {
+       int devfn_to;
+
+       nr_devfns = min(nr_devfns, (unsigned) MAX_NR_DEVFNS - devfn_from);
+       devfn_to = devfn_from + nr_devfns - 1;
+
        if (!dev->dma_alias_mask)
                dev->dma_alias_mask = bitmap_zalloc(MAX_NR_DEVFNS, GFP_KERNEL);
        if (!dev->dma_alias_mask) {
@@ -6023,9 +6029,15 @@ void pci_add_dma_alias(struct pci_dev *dev, u8 devfn)
                return;
        }
 
-       set_bit(devfn, dev->dma_alias_mask);
-       pci_info(dev, "Enabling fixed DMA alias to %02x.%d\n",
-                PCI_SLOT(devfn), PCI_FUNC(devfn));
+       bitmap_set(dev->dma_alias_mask, devfn_from, nr_devfns);
+
+       if (nr_devfns == 1)
+               pci_info(dev, "Enabling fixed DMA alias to %02x.%d\n",
+                               PCI_SLOT(devfn_from), PCI_FUNC(devfn_from));
+       else if (nr_devfns > 1)
+               pci_info(dev, "Enabling fixed DMA alias for devfn range from 
%02x.%d to %02x.%d\n",
+                               PCI_SLOT(devfn_from), PCI_FUNC(devfn_from),
+                               PCI_SLOT(devfn_to), PCI_FUNC(devfn_to));
 }
 
 bool pci_devs_are_dma_aliases(struct pci_dev *dev1, struct pci_dev *dev2)
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index c0b7aa4dc0f51..9aa590eb712fe 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -3927,7 +3927,7 @@ int pci_dev_specific_reset(struct pci_dev *dev, int probe)
 static void quirk_dma_func0_alias(struct pci_dev *dev)
 {
        if (PCI_FUNC(dev->devfn) != 0)
-               pci_add_dma_alias(dev, PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
+               pci_add_dma_alias(dev, PCI_DEVFN(PCI_SLOT(dev->devfn), 0), 1);
 }
 
 /*
@@ -3941,7 +3941,7 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_RICOH, 0xe476, 
quirk_dma_func0_alias);
 static void quirk_dma_func1_alias(struct pci_dev *dev)
 {
        if (PCI_FUNC(dev->devfn) != 1)
-               pci_add_dma_alias(dev, PCI_DEVFN(PCI_SLOT(dev->devfn), 1));
+               pci_add_dma_alias(dev, PCI_DEVFN(PCI_SLOT(dev->devfn), 1), 1);
 }
 
 /*
@@ -4026,7 +4026,7 @@ static void quirk_fixed_dma_alias(struct pci_dev *dev)
 
        id = pci_match_id(fixed_dma_alias_tbl, dev);
        if (id)
-               pci_add_dma_alias(dev, id->driver_data);
+               pci_add_dma_alias(dev, id->driver_data, 1);
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ADAPTEC2, 0x0285, 
quirk_fixed_dma_alias);
 
@@ -4067,9 +4067,9 @@ DECLARE_PCI_FIXUP_HEADER(0x8086, 0x244e, 
quirk_use_pcie_bridge_dma_alias);
  */
 static void quirk_mic_x200_dma_alias(struct pci_dev *pdev)
 {
-       pci_add_dma_alias(pdev, PCI_DEVFN(0x10, 0x0));
-       pci_add_dma_alias(pdev, PCI_DEVFN(0x11, 0x0));
-       pci_add_dma_alias(pdev, PCI_DEVFN(0x12, 0x3));
+       pci_add_dma_alias(pdev, PCI_DEVFN(0x10, 0x0), 1);
+       pci_add_dma_alias(pdev, PCI_DEVFN(0x11, 0x0), 1);
+       pci_add_dma_alias(pdev, PCI_DEVFN(0x12, 0x3), 1);
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2260, 
quirk_mic_x200_dma_alias);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2264, 
quirk_mic_x200_dma_alias);
@@ -4093,13 +4093,8 @@ static void quirk_pex_vca_alias(struct pci_dev *pdev)
        const unsigned int num_pci_slots = 0x20;
        unsigned int slot;
 
-       for (slot = 0; slot < num_pci_slots; slot++) {
-               pci_add_dma_alias(pdev, PCI_DEVFN(slot, 0x0));
-               pci_add_dma_alias(pdev, PCI_DEVFN(slot, 0x1));
-               pci_add_dma_alias(pdev, PCI_DEVFN(slot, 0x2));
-               pci_add_dma_alias(pdev, PCI_DEVFN(slot, 0x3));
-               pci_add_dma_alias(pdev, PCI_DEVFN(slot, 0x4));
-       }
+       for (slot = 0; slot < num_pci_slots; slot++)
+               pci_add_dma_alias(pdev, PCI_DEVFN(slot, 0x0), 5);
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2954, quirk_pex_vca_alias);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2955, quirk_pex_vca_alias);
@@ -5334,7 +5329,7 @@ static void quirk_switchtec_ntb_dma_alias(struct pci_dev 
*pdev)
                        pci_dbg(pdev,
                                "Aliasing Partition %d Proxy ID %02x.%d\n",
                                pp, PCI_SLOT(devfn), PCI_FUNC(devfn));
-                       pci_add_dma_alias(pdev, devfn);
+                       pci_add_dma_alias(pdev, devfn, 1);
                }
        }
 
diff --git a/include/linux/pci.h b/include/linux/pci.h
index c393dff2d66f6..930fab2930736 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -2310,7 +2310,7 @@ static inline struct eeh_dev *pci_dev_to_eeh_dev(struct 
pci_dev *pdev)
 }
 #endif
 
-void pci_add_dma_alias(struct pci_dev *dev, u8 devfn);
+void pci_add_dma_alias(struct pci_dev *dev, u8 devfn_from, unsigned nr_devfns);
 bool pci_devs_are_dma_aliases(struct pci_dev *dev1, struct pci_dev *dev2);
 int pci_for_each_dma_alias(struct pci_dev *pdev,
                           int (*fn)(struct pci_dev *pdev,
-- 
2.20.1

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