From: Jérôme Glisse <[email protected]> device_test_p2p() return true if two devices can peer to peer to each other. We add a generic function as different inter-connect can support peer to peer and we want to genericaly test this no matter what the inter-connect might be. However this version only support PCIE for now.
Signed-off-by: Jérôme Glisse <[email protected]> Cc: Logan Gunthorpe <[email protected]> Cc: Greg Kroah-Hartman <[email protected]> Cc: Rafael J. Wysocki <[email protected]> Cc: Bjorn Helgaas <[email protected]> Cc: Christian Koenig <[email protected]> Cc: Felix Kuehling <[email protected]> Cc: Jason Gunthorpe <[email protected]> Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: Christoph Hellwig <[email protected]> Cc: Marek Szyprowski <[email protected]> Cc: Robin Murphy <[email protected]> Cc: Joerg Roedel <[email protected]> Cc: [email protected] --- drivers/base/core.c | 20 ++++++++++++++++++++ include/linux/device.h | 1 + 2 files changed, 21 insertions(+) diff --git a/drivers/base/core.c b/drivers/base/core.c index 0073b09bb99f..56023b00e108 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -26,6 +26,7 @@ #include <linux/netdevice.h> #include <linux/sched/signal.h> #include <linux/sysfs.h> +#include <linux/pci-p2pdma.h> #include "base.h" #include "power/power.h" @@ -3167,3 +3168,22 @@ void device_set_of_node_from_dev(struct device *dev, const struct device *dev2) dev->of_node_reused = true; } EXPORT_SYMBOL_GPL(device_set_of_node_from_dev); + +/** + * device_test_p2p - test if two device can peer to peer to each other + * @devA: device A + * @devB: device B + * Returns: true if device can peer to peer to each other, false otherwise + */ +bool device_test_p2p(struct device *devA, struct device *devB) +{ + /* + * For now we only support PCIE peer to peer but other inter-connect + * can be added. + */ + if (pci_test_p2p(devA, devB)) + return true; + + return false; +} +EXPORT_SYMBOL_GPL(device_test_p2p); diff --git a/include/linux/device.h b/include/linux/device.h index 6cb4640b6160..0d532d7f0779 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -1250,6 +1250,7 @@ extern int device_online(struct device *dev); extern void set_primary_fwnode(struct device *dev, struct fwnode_handle *fwnode); extern void set_secondary_fwnode(struct device *dev, struct fwnode_handle *fwnode); void device_set_of_node_from_dev(struct device *dev, const struct device *dev2); +bool device_test_p2p(struct device *devA, struct device *devB); static inline int dev_num_vf(struct device *dev) { -- 2.17.2
