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Message-Id: <1444269709-25270-8-git-send-email-kys@microsoft.com> Date: Wed, 7 Oct 2015 19:01:47 -0700 From: "K. Y. Srinivasan" <kys@...rosoft.com> To: gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org, devel@...uxdriverproject.org, olaf@...fle.de, apw@...onical.com, vkuznets@...hat.com, jasowang@...hat.com Cc: Jake Oshins <jakeo@...rosoft.com>, "K. Y. Srinivasan" <kys@...rosoft.com> Subject: [PATCH 08/10] drivers:hv: Export a function that maps Linux CPU num onto Hyper-V proc num From: Jake Oshins <jakeo@...rosoft.com> This patch exposes the mapping between Linux CPU number and Hyper-V virtual processor number. This is necessary because the hypervisor needs to know which virtual processors to target when making a mapping in the Interrupt Redirection Table in the I/O MMU. Signed-off-by: Jake Oshins <jakeo@...rosoft.com> Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com> --- drivers/hv/vmbus_drv.c | 17 +++++++++++++++++ include/linux/hyperv.h | 2 ++ 2 files changed, 19 insertions(+), 0 deletions(-) diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c index 3297731..c01b689 100644 --- a/drivers/hv/vmbus_drv.c +++ b/drivers/hv/vmbus_drv.c @@ -1193,6 +1193,23 @@ int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj, } EXPORT_SYMBOL_GPL(vmbus_allocate_mmio); +/** + * vmbus_cpu_number_to_vp_number() - Map CPU to VP. + * @cpu_number: CPU number in Linux terms + * + * This function returns the mapping between the Linux processor + * number and the hypervisor's virtual processor number, useful + * in making hypercalls and such that talk about specific + * processors. + * + * Return: Virtual processor number in Hyper-V terms + */ +int vmbus_cpu_number_to_vp_number(int cpu_number) +{ + return hv_context.vp_index[cpu_number]; +} +EXPORT_SYMBOL_GPL(vmbus_cpu_number_to_vp_number); + static int vmbus_acpi_add(struct acpi_device *device) { acpi_status result; diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h index 54733d5..02393b6 100644 --- a/include/linux/hyperv.h +++ b/include/linux/hyperv.h @@ -982,6 +982,8 @@ int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj, resource_size_t size, resource_size_t align, bool fb_overlap_ok); +int vmbus_cpu_number_to_vp_number(int cpu_number); + /** * VMBUS_DEVICE - macro used to describe a specific hyperv vmbus device * -- 1.7.4.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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