aboutsummaryrefslogtreecommitdiffstats
path: root/target/linux/brcm2708/patches-3.10/0148-bcm2708_fb-report-number-of-dma-copies.patch
blob: a7817237e7e638cf084205a893d83cfbb62721d9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
From ceb70800efa2f4c92f0c89bf472005decd577d65 Mon Sep 17 00:00:00 2001
From: Luke Diamand <luked@broadcom.com>
Date: Tue, 31 Dec 2013 23:07:36 +0000
Subject: [PATCH 148/196] bcm2708_fb: report number of dma copies

Add a counter (exported via debugfs) reporting the
number of dma copies that the framebuffer driver
has done, in order to help evaluate different
optimization strategies.

Signed-off-by: Luke Diamand <luked@broadcom.com>
---
 drivers/video/bcm2708_fb.c | 55 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)

diff --git a/drivers/video/bcm2708_fb.c b/drivers/video/bcm2708_fb.c
index c10c5ee..4d7d963 100644
--- a/drivers/video/bcm2708_fb.c
+++ b/drivers/video/bcm2708_fb.c
@@ -27,6 +27,7 @@
 #include <linux/clk.h>
 #include <linux/printk.h>
 #include <linux/console.h>
+#include <linux/debugfs.h>
 
 #include <mach/dma.h>
 #include <mach/platform.h>
@@ -58,6 +59,12 @@ struct fbinfo_s {
 	u16 cmap[256];
 };
 
+struct bcm2708_fb_stats {
+	struct debugfs_regset32 regset;
+	u32 dma_copies;
+	u32 dma_irqs;
+};
+
 struct bcm2708_fb {
 	struct fb_info fb;
 	struct platform_device *dev;
@@ -69,10 +76,51 @@ struct bcm2708_fb {
 	void __iomem *dma_chan_base;
 	void *cb_base;		/* DMA control blocks */
 	dma_addr_t cb_handle;
+	struct dentry *debugfs_dir;
+	struct bcm2708_fb_stats stats;
 };
 
 #define to_bcm2708(info)	container_of(info, struct bcm2708_fb, fb)
 
+static void bcm2708_fb_debugfs_deinit(struct bcm2708_fb *fb)
+{
+	debugfs_remove_recursive(fb->debugfs_dir);
+	fb->debugfs_dir = NULL;
+}
+
+static int bcm2708_fb_debugfs_init(struct bcm2708_fb *fb)
+{
+	static struct debugfs_reg32 stats_registers[] = {
+		{
+			"dma_copies",
+			offsetof(struct bcm2708_fb_stats, dma_copies)
+		},
+	};
+
+	fb->debugfs_dir = debugfs_create_dir(DRIVER_NAME, NULL);
+	if (!fb->debugfs_dir) {
+		pr_warn("%s: could not create debugfs entry\n",
+			__func__);
+		return -EFAULT;
+	}
+
+	fb->stats.regset.regs = stats_registers;
+	fb->stats.regset.nregs = ARRAY_SIZE(stats_registers);
+	fb->stats.regset.base = &fb->stats;
+
+	if (!debugfs_create_regset32(
+		"stats", 0444, fb->debugfs_dir, &fb->stats.regset)) {
+		pr_warn("%s: could not create statistics registers\n",
+			__func__);
+		goto fail;
+	}
+	return 0;
+
+fail:
+	bcm2708_fb_debugfs_deinit(fb);
+	return -EFAULT;
+}
+
 static int bcm2708_fb_set_bitfields(struct fb_var_screeninfo *var)
 {
 	int ret = 0;
@@ -443,8 +491,10 @@ static void bcm2708_fb_copyarea(struct fb_info *info,
 	/* end of dma control blocks chain */
 	cb->next = 0;
 
+
 	bcm_dma_start(fb->dma_chan_base, fb->cb_handle);
 	bcm_dma_wait_idle(fb->dma_chan_base);
+	fb->stats.dma_copies++;
 }
 
 static void bcm2708_fb_imageblit(struct fb_info *info,
@@ -552,6 +602,9 @@ static int bcm2708_fb_probe(struct platform_device *dev)
 	}
 	memset(fb, 0, sizeof(struct bcm2708_fb));
 
+
+	bcm2708_fb_debugfs_init(fb);
+
 	fb->cb_base = dma_alloc_writecombine(&dev->dev, SZ_64K,
 					     &fb->cb_handle, GFP_KERNEL);
 	if (!fb->cb_base) {
@@ -607,6 +660,8 @@ static int bcm2708_fb_remove(struct platform_device *dev)
 
 	dma_free_coherent(NULL, PAGE_ALIGN(sizeof(*fb->info)), (void *)fb->info,
 			  fb->dma);
+	bcm2708_fb_debugfs_deinit(fb);
+
 	kfree(fb);
 
 	return 0;
-- 
1.9.1