linux-kernel - [PATCH char-misc 1/1] Drivers: hv: vmbus: Remove use of slow_virt_to

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Message-Id: <1532981831-28816-1-git-send-email-mikelley@microsoft.com>
Date:   Mon, 30 Jul 2018 13:17:11 -0700
From:   mhkelley58@...il.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,
        marcelo.cerri@...onical.com, sthemmin@...rosoft.com,
        kys@...rosoft.com
Cc:     mikelley@...rosoft.com
Subject: [PATCH char-misc 1/1] Drivers: hv: vmbus: Remove use of slow_virt_to_phys()

From: Michael Kelley <mikelley@...rosoft.com>

slow_virt_to_phys() is only implemented for arch/x86.
Remove its use in arch independent Hyper-V drivers, and
replace with test for vmalloc() address followed by
appropriate v-to-p function. This follows the typical
pattern of other drivers and avoids the need to implement
slow_virt_to_phys() for Hyper-V on ARM64.

Signed-off-by: Michael Kelley <mikelley@...rosoft.com>
---
 drivers/hv/channel.c | 27 ++++++++++++++++++++-------
 1 file changed, 20 insertions(+), 7 deletions(-)

diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
index ba0a092..d972a12 100644
--- a/drivers/hv/channel.c
+++ b/drivers/hv/channel.c
@@ -29,12 +29,26 @@
 #include <linux/hyperv.h>
 #include <linux/uio.h>
 #include <linux/interrupt.h>
+#include <asm/page.h>
 
 #include "hyperv_vmbus.h"
 
 #define NUM_PAGES_SPANNED(addr, len) \
 ((PAGE_ALIGN(addr + len) >> PAGE_SHIFT) - (addr >> PAGE_SHIFT))
 
+static unsigned long virt_to_hvpfn(void *addr)
+{
+	unsigned long paddr;
+
+	if (is_vmalloc_addr(addr))
+		paddr = page_to_phys(vmalloc_to_page(addr)) +
+					 offset_in_page(addr);
+	else
+		paddr = __pa(addr);
+
+	return  paddr >> PAGE_SHIFT;
+}
+
 /*
  * vmbus_setevent- Trigger an event notification on the specified
  * channel.
@@ -298,8 +312,8 @@ static int create_gpadl_header(void *kbuffer, u32 size,
 		gpadl_header->range[0].byte_offset = 0;
 		gpadl_header->range[0].byte_count = size;
 		for (i = 0; i < pfncount; i++)
-			gpadl_header->range[0].pfn_array[i] = slow_virt_to_phys(
-				kbuffer + PAGE_SIZE * i) >> PAGE_SHIFT;
+			gpadl_header->range[0].pfn_array[i] = virt_to_hvpfn(
+				kbuffer + PAGE_SIZE * i);
 		*msginfo = msgheader;
 
 		pfnsum = pfncount;
@@ -350,9 +364,8 @@ static int create_gpadl_header(void *kbuffer, u32 size,
 			 * so the hypervisor guarantees that this is ok.
 			 */
 			for (i = 0; i < pfncurr; i++)
-				gpadl_body->pfn[i] = slow_virt_to_phys(
-					kbuffer + PAGE_SIZE * (pfnsum + i)) >>
-					PAGE_SHIFT;
+				gpadl_body->pfn[i] = virt_to_hvpfn(
+					kbuffer + PAGE_SIZE * (pfnsum + i));
 
 			/* add to msg header */
 			list_add_tail(&msgbody->msglistentry,
@@ -380,8 +393,8 @@ static int create_gpadl_header(void *kbuffer, u32 size,
 		gpadl_header->range[0].byte_offset = 0;
 		gpadl_header->range[0].byte_count = size;
 		for (i = 0; i < pagecount; i++)
-			gpadl_header->range[0].pfn_array[i] = slow_virt_to_phys(
-				kbuffer + PAGE_SIZE * i) >> PAGE_SHIFT;
+			gpadl_header->range[0].pfn_array[i] = virt_to_hvpfn(
+				kbuffer + PAGE_SIZE * i);
 
 		*msginfo = msgheader;
 	}
-- 
1.8.3.1