linux-kernel - [PATCH 17/18] Drivers: hv: vmbus: Define an APIs to manage interrupt state

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Message-Id: <1483133772-29776-17-git-send-email-kys@exchange.microsoft.com>
Date:   Fri, 30 Dec 2016 13:36:11 -0800
From:   kys@...hange.microsoft.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,
        leann.ogasawara@...onical.com, rkagan@...tuozzo.com,
        x86@...nel.org, tglx@...utronix.de, hpa@...or.com
Cc:     "K. Y. Srinivasan" <kys@...rosoft.com>
Subject: [PATCH 17/18] Drivers: hv: vmbus: Define an APIs to manage interrupt state

From: K. Y. Srinivasan <kys@...rosoft.com>

As part of cleaning up architecture specific code, define APIs
to manage interrupt state.

Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
---
 arch/x86/include/asm/mshyperv.h |    3 +++
 drivers/hv/hv.c                 |   12 ++++++++----
 2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h
index 2d40bfc..42505d1 100644
--- a/arch/x86/include/asm/mshyperv.h
+++ b/arch/x86/include/asm/mshyperv.h
@@ -151,6 +151,9 @@ static inline void vmbus_signal_eom(struct hv_message *msg, u32 old_msg_type)
 
 #define hv_get_vp_index(index) rdmsrl(HV_X64_MSR_VP_INDEX, index)
 
+#define hv_get_synint_state(int_num, val) rdmsrl(int_num, val)
+#define hv_set_synint_state(int_num, val) wrmsrl(int_num, val)
+
 void hyperv_callback_vector(void);
 #ifdef CONFIG_TRACING
 #define trace_hyperv_callback_vector hyperv_callback_vector
diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c
index 9b2630b..df55257 100644
--- a/drivers/hv/hv.c
+++ b/drivers/hv/hv.c
@@ -284,14 +284,16 @@ int hv_synic_init(unsigned int cpu)
 	hv_set_siefp(siefp.as_uint64);
 
 	/* Setup the shared SINT. */
-	rdmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
+	hv_get_synint_state(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT,
+			    shared_sint.as_uint64);
 
 	shared_sint.as_uint64 = 0;
 	shared_sint.vector = HYPERVISOR_CALLBACK_VECTOR;
 	shared_sint.masked = false;
 	shared_sint.auto_eoi = true;
 
-	wrmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
+	hv_set_synint_state(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT,
+			    shared_sint.as_uint64);
 
 	/* Enable the global synic bit */
 	hv_get_synic_state(sctrl.as_uint64);
@@ -384,13 +386,15 @@ int hv_synic_cleanup(unsigned int cpu)
 		hv_ce_shutdown(hv_context.clk_evt[cpu]);
 	}
 
-	rdmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
+	hv_get_synint_state(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT,
+			    shared_sint.as_uint64);
 
 	shared_sint.masked = 1;
 
 	/* Need to correctly cleanup in the case of SMP!!! */
 	/* Disable the interrupt */
-	wrmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
+	hv_set_synint_state(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT,
+			    shared_sint.as_uint64);
 
 	hv_get_simp(simp.as_uint64);
 	simp.simp_enabled = 0;
-- 
1.7.4.1