diff mbox series

[v3,3/5] PCI: Introduce pci_direct_dma_alias()

Message ID 1578676873-6206-4-git-send-email-jonathan.derrick@intel.com
State New
Headers show
Series Clean up VMD DMA Map Ops | expand

Commit Message

Derrick, Jonathan Jan. 10, 2020, 5:21 p.m. UTC
The current DMA alias implementation requires the aliased device be on
the same PCI bus as the requester ID. This introduces an arch-specific
mechanism to point to another PCI device when doing mapping and
PCI DMA alias search.

Signed-off-by: Jon Derrick <jonathan.derrick@intel.com>
---
 arch/x86/pci/common.c |  7 +++++++
 drivers/pci/pci.c     | 19 ++++++++++++++++++-
 drivers/pci/search.c  |  7 +++++++
 include/linux/pci.h   |  1 +
 4 files changed, 33 insertions(+), 1 deletion(-)

Comments

Christoph Hellwig Jan. 14, 2020, 8:51 a.m. UTC | #1
On Fri, Jan 10, 2020 at 10:21:11AM -0700, Jon Derrick wrote:
> The current DMA alias implementation requires the aliased device be on
> the same PCI bus as the requester ID. This introduces an arch-specific
> mechanism to point to another PCI device when doing mapping and
> PCI DMA alias search.
> 
> Signed-off-by: Jon Derrick <jonathan.derrick@intel.com>
> ---
>  arch/x86/pci/common.c |  7 +++++++
>  drivers/pci/pci.c     | 19 ++++++++++++++++++-
>  drivers/pci/search.c  |  7 +++++++
>  include/linux/pci.h   |  1 +
>  4 files changed, 33 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/x86/pci/common.c b/arch/x86/pci/common.c
> index 1e59df0..83334a5 100644
> --- a/arch/x86/pci/common.c
> +++ b/arch/x86/pci/common.c
> @@ -736,3 +736,10 @@ int pci_ext_cfg_avail(void)
>  	else
>  		return 0;
>  }
> +
> +#if IS_ENABLED(CONFIG_VMD)
> +struct pci_dev *pci_direct_dma_alias(struct pci_dev *dev)
> +{
> +	return to_pci_sysdata(dev->bus)->vmd_dev;
> +}
> +#endif
> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> index ad746d9..1362694 100644
> --- a/drivers/pci/pci.c
> +++ b/drivers/pci/pci.c
> @@ -6034,7 +6034,9 @@ bool pci_devs_are_dma_aliases(struct pci_dev *dev1, struct pci_dev *dev2)
>  	return (dev1->dma_alias_mask &&
>  		test_bit(dev2->devfn, dev1->dma_alias_mask)) ||
>  	       (dev2->dma_alias_mask &&
> -		test_bit(dev1->devfn, dev2->dma_alias_mask));
> +		test_bit(dev1->devfn, dev2->dma_alias_mask)) ||
> +	       (pci_direct_dma_alias(dev1) == dev2) ||
> +	       (pci_direct_dma_alias(dev2) == dev1);

No need for the inner braces here.
diff mbox series

Patch

diff --git a/arch/x86/pci/common.c b/arch/x86/pci/common.c
index 1e59df0..83334a5 100644
--- a/arch/x86/pci/common.c
+++ b/arch/x86/pci/common.c
@@ -736,3 +736,10 @@  int pci_ext_cfg_avail(void)
 	else
 		return 0;
 }
+
+#if IS_ENABLED(CONFIG_VMD)
+struct pci_dev *pci_direct_dma_alias(struct pci_dev *dev)
+{
+	return to_pci_sysdata(dev->bus)->vmd_dev;
+}
+#endif
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index ad746d9..1362694 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -6034,7 +6034,9 @@  bool pci_devs_are_dma_aliases(struct pci_dev *dev1, struct pci_dev *dev2)
 	return (dev1->dma_alias_mask &&
 		test_bit(dev2->devfn, dev1->dma_alias_mask)) ||
 	       (dev2->dma_alias_mask &&
-		test_bit(dev1->devfn, dev2->dma_alias_mask));
+		test_bit(dev1->devfn, dev2->dma_alias_mask)) ||
+	       (pci_direct_dma_alias(dev1) == dev2) ||
+	       (pci_direct_dma_alias(dev2) == dev1);
 }
 
 bool pci_device_is_present(struct pci_dev *pdev)
@@ -6058,6 +6060,21 @@  void pci_ignore_hotplug(struct pci_dev *dev)
 }
 EXPORT_SYMBOL_GPL(pci_ignore_hotplug);
 
+/**
+ * pci_direct_dma_alias - Get PCI DMA alias for PCI device
+ * @dev: the PCI device that may have a PCI DMA alias
+ *
+ * Permits the platform to provide architecture-specific functionality to
+ * devices needing to alias DMA to another PCI device on another PCI bus. If
+ * the PCI device is on the same bus, it is recommended to use
+ * pci_add_dma_alias(). This is the default implementation. Architecture
+ * implementations can override this.
+ */
+struct pci_dev __weak *pci_direct_dma_alias(struct pci_dev *dev)
+{
+	return NULL;
+}
+
 resource_size_t __weak pcibios_default_alignment(void)
 {
 	return 0;
diff --git a/drivers/pci/search.c b/drivers/pci/search.c
index bade140..12811b3 100644
--- a/drivers/pci/search.c
+++ b/drivers/pci/search.c
@@ -32,6 +32,13 @@  int pci_for_each_dma_alias(struct pci_dev *pdev,
 	struct pci_bus *bus;
 	int ret;
 
+	/*
+	 * The device may have an explicit alias requester ID for DMA where the
+	 * requester is on another PCI bus.
+	 */
+	if (unlikely(pci_direct_dma_alias(pdev)))
+		pdev = pci_direct_dma_alias(pdev);
+
 	ret = fn(pdev, pci_dev_id(pdev), data);
 	if (ret)
 		return ret;
diff --git a/include/linux/pci.h b/include/linux/pci.h
index c393dff..cb6677b 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1202,6 +1202,7 @@  u32 pcie_bandwidth_available(struct pci_dev *dev, struct pci_dev **limiting_dev,
 int pci_select_bars(struct pci_dev *dev, unsigned long flags);
 bool pci_device_is_present(struct pci_dev *pdev);
 void pci_ignore_hotplug(struct pci_dev *dev);
+struct pci_dev *pci_direct_dma_alias(struct pci_dev *dev);
 
 int __printf(6, 7) pci_request_irq(struct pci_dev *dev, unsigned int nr,
 		irq_handler_t handler, irq_handler_t thread_fn, void *dev_id,