From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: jakeo@microsoft.com To: gregkh@linuxfoundation.org, kys@microsoft.com, linux-kernel@vger.kernel.org, devel@linuxdriverproject.org, olaf@aepfle.de, apw@canonical.com, vkuznets@redhat.com, bhelgaas@google.com, linux-pci@vger.kernel.org, pebolle@tiscali.nl, haiyangz@microsoft.com, mebersol@microsoft.com Cc: Jake Oshins Subject: [PATCH v2 3/6] arch:x86:hv: Add mechanism for Hyper-V paravirt drivers to hook msi message creation Date: Mon, 15 Jun 2015 17:06:36 +0000 Message-Id: <1434387999-1885-4-git-send-email-jakeo@microsoft.com> In-Reply-To: <1434387999-1885-1-git-send-email-jakeo@microsoft.com> References: <1434387999-1885-1-git-send-email-jakeo@microsoft.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: From: Jake Oshins This patch, when the kernel is built with CONFIG_HYPERV, exposes functions that would allow a paravirtual PCI front-end driver to hook MSI (message- signaled interrupt) message creation. Signed-off-by: Jake Oshins --- arch/x86/include/asm/mshyperv.h | 2 ++ arch/x86/kernel/cpu/mshyperv.c | 30 ++++++++++++++++++++++++++++++ 2 files changed, 32 insertions(+) diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h index c163215..bf7789e 100644 --- a/arch/x86/include/asm/mshyperv.h +++ b/arch/x86/include/asm/mshyperv.h @@ -19,5 +19,7 @@ void hyperv_callback_vector(void); void hyperv_vector_handler(struct pt_regs *regs); void hv_setup_vmbus_irq(void (*handler)(void)); void hv_remove_vmbus_irq(void); +void hyperv_install_interrupt_translation(struct x86_msi_ops *new_ops); +void hyperv_uninstall_interrupt_translation(void); #endif diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c index 939155f..816e329 100644 --- a/arch/x86/kernel/cpu/mshyperv.c +++ b/arch/x86/kernel/cpu/mshyperv.c @@ -69,6 +69,36 @@ void hv_remove_vmbus_irq(void) } EXPORT_SYMBOL_GPL(hv_setup_vmbus_irq); EXPORT_SYMBOL_GPL(hv_remove_vmbus_irq); + +struct x86_msi_ops old_msi_ops; + +void hyperv_install_interrupt_translation(struct x86_msi_ops *new_ops) +{ + old_msi_ops.setup_msi_irqs = xchg(&(x86_msi.setup_msi_irqs), + new_ops->setup_msi_irqs); + old_msi_ops.compose_msi_msg = xchg(&(x86_msi.compose_msi_msg), + new_ops->compose_msi_msg); + old_msi_ops.teardown_msi_irqs = xchg(&(x86_msi.teardown_msi_irqs), + new_ops->teardown_msi_irqs); + old_msi_ops.restore_msi_irqs = xchg(&(x86_msi.restore_msi_irqs), + new_ops->restore_msi_irqs); + + new_ops->setup_msi_irqs = old_msi_ops.setup_msi_irqs; + new_ops->compose_msi_msg = old_msi_ops.compose_msi_msg; + new_ops->teardown_msi_irqs = old_msi_ops.teardown_msi_irqs; + new_ops->restore_msi_irqs = old_msi_ops.restore_msi_irqs; +} +EXPORT_SYMBOL_GPL(hyperv_install_interrupt_translation); + +void hyperv_uninstall_interrupt_translation(void) +{ + xchg(&(x86_msi.setup_msi_irqs), old_msi_ops.setup_msi_irqs); + xchg(&(x86_msi.compose_msi_msg), old_msi_ops.compose_msi_msg); + xchg(&(x86_msi.teardown_msi_irqs), old_msi_ops.teardown_msi_irqs); + xchg(&(x86_msi.restore_msi_irqs), old_msi_ops.restore_msi_irqs); +} +EXPORT_SYMBOL_GPL(hyperv_uninstall_interrupt_translation); + #endif static uint32_t __init ms_hyperv_platform(void) -- 1.9.1