linux-kernel - [PATCH 2/5] staging: vc04_services: Remove cache-line-size property.

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Message-Id: <20180305202806.21219-3-eric@anholt.net>
Date:   Mon,  5 Mar 2018 12:28:03 -0800
From:   Eric Anholt <eric@...olt.net>
To:     Florian Fainelli <f.fainelli@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Phil Elwell <phil@...pberrypi.org>
Cc:     linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Stefan Wahren <stefan.wahren@...e.com>,
        bcm-kernel-feedback-list@...adcom.com,
        Eric Anholt <eric@...olt.net>
Subject: [PATCH 2/5] staging: vc04_services: Remove cache-line-size property.

This was just a way for the DT-passed value to get out of sync with
what Linux has configured the ARM for.

Signed-off-by: Eric Anholt <eric@...olt.net>
---
 .../interface/vchiq_arm/vchiq_2835_arm.c           | 25 +++++++---------------
 .../interface/vchiq_arm/vchiq_pagelist.h           |  1 -
 2 files changed, 8 insertions(+), 18 deletions(-)

diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
index b59ef14890aa..e0e01c812036 100644
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
@@ -77,7 +77,6 @@ struct vchiq_pagelist_info {
 };
 
 static void __iomem *g_regs;
-static unsigned int g_cache_line_size = sizeof(CACHE_LINE_SIZE);
 static unsigned int g_fragments_size;
 static char *g_fragments_base;
 static char *g_free_fragments;
@@ -117,15 +116,7 @@ int vchiq_platform_init(struct platform_device *pdev, VCHIQ_STATE_T *state)
 	if (err < 0)
 		return err;
 
-	err = of_property_read_u32(dev->of_node, "cache-line-size",
-				   &g_cache_line_size);
-
-	if (err) {
-		dev_err(dev, "Missing cache-line-size property\n");
-		return -ENODEV;
-	}
-
-	g_fragments_size = 2 * g_cache_line_size;
+	g_fragments_size = 2 * cache_line_size();
 
 	/* Allocate space for the channels in coherent memory */
 	slot_mem_size = PAGE_ALIGN(TOTAL_SLOTS * VCHIQ_SLOT_SIZE);
@@ -548,9 +539,9 @@ create_pagelist(char __user *buf, size_t count, unsigned short type)
 
 	/* Partial cache lines (fragments) require special measures */
 	if ((type == PAGELIST_READ) &&
-		((pagelist->offset & (g_cache_line_size - 1)) ||
+		((pagelist->offset & (cache_line_size() - 1)) ||
 		((pagelist->offset + pagelist->length) &
-		(g_cache_line_size - 1)))) {
+		 (cache_line_size() - 1)))) {
 		char *fragments;
 
 		if (down_interruptible(&g_free_fragments_sema) != 0) {
@@ -598,10 +589,10 @@ free_pagelist(struct vchiq_pagelist_info *pagelistinfo,
 			g_fragments_size;
 		int head_bytes, tail_bytes;
 
-		head_bytes = (g_cache_line_size - pagelist->offset) &
-			(g_cache_line_size - 1);
+		head_bytes = (cache_line_size() - pagelist->offset) &
+			(cache_line_size() - 1);
 		tail_bytes = (pagelist->offset + actual) &
-			(g_cache_line_size - 1);
+			(cache_line_size() - 1);
 
 		if ((actual >= 0) && (head_bytes != 0)) {
 			if (head_bytes > actual)
@@ -617,8 +608,8 @@ free_pagelist(struct vchiq_pagelist_info *pagelistinfo,
 			(tail_bytes != 0)) {
 			memcpy((char *)kmap(pages[num_pages - 1]) +
 				((pagelist->offset + actual) &
-				(PAGE_SIZE - 1) & ~(g_cache_line_size - 1)),
-				fragments + g_cache_line_size,
+				(PAGE_SIZE - 1) & ~(cache_line_size() - 1)),
+				fragments + cache_line_size(),
 				tail_bytes);
 			kunmap(pages[num_pages - 1]);
 		}
diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_pagelist.h b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_pagelist.h
index a6c5f7cc78f0..bec411061554 100644
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_pagelist.h
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_pagelist.h
@@ -34,7 +34,6 @@
 #ifndef VCHIQ_PAGELIST_H
 #define VCHIQ_PAGELIST_H
 
-#define CACHE_LINE_SIZE 32
 #define PAGELIST_WRITE 0
 #define PAGELIST_READ 1
 #define PAGELIST_READ_WITH_FRAGMENTS 2
-- 
2.16.2