aboutsummaryrefslogtreecommitdiffstats
path: root/target/linux/bcm27xx/patches-5.4/950-0213-vchiq-Add-36-bit-address-support.patch
blob: ca2a40488a38403c6b310cfbae1f1a170b8fe730 (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
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
From 2cba27bce0470a06237b3bd7883d43ade0d5c39c Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Thu, 1 Nov 2018 17:31:37 +0000
Subject: [PATCH] vchiq: Add 36-bit address support

Conditional on a new compatible string, change the pagelist encoding
such that the top 24 bits are the pfn, leaving 8 bits for run length
(-1).

Signed-off-by: Phil Elwell <phil@raspberrypi.org>
---
 .../interface/vchiq_arm/vchiq_2835_arm.c      | 90 ++++++++++++++-----
 .../interface/vchiq_arm/vchiq_arm.c           |  6 ++
 .../interface/vchiq_arm/vchiq_arm.h           |  1 +
 3 files changed, 75 insertions(+), 22 deletions(-)

--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
@@ -16,6 +16,8 @@
 #include <soc/bcm2835/raspberrypi-firmware.h>
 
 #define TOTAL_SLOTS (VCHIQ_SLOT_ZERO_SLOTS + 2 * 32)
+#define VC_SAFE(x) (g_use_36bit_addrs ? ((u32)(x) | 0xc0000000) : (u32)(x))
+#define IS_VC_SAFE(x) (g_use_36bit_addrs ? !((x) & ~0x3fffffffull) : 1)
 
 #include "vchiq_arm.h"
 #include "vchiq_connected.h"
@@ -63,6 +65,7 @@ static void __iomem *g_regs;
  */
 static unsigned int g_cache_line_size = 32;
 static struct dma_pool *g_dma_pool;
+static unsigned int g_use_36bit_addrs = 0;
 static unsigned int g_fragments_size;
 static char *g_fragments_base;
 static char *g_free_fragments;
@@ -106,6 +109,8 @@ int vchiq_platform_init(struct platform_
 	g_cache_line_size = drvdata->cache_line_size;
 	g_fragments_size = 2 * g_cache_line_size;
 
+	g_use_36bit_addrs = (dev->dma_pfn_offset == 0);
+
 	/* Allocate space for the channels in coherent memory */
 	slot_mem_size = PAGE_ALIGN(TOTAL_SLOTS * VCHIQ_SLOT_SIZE);
 	frag_mem_size = PAGE_ALIGN(g_fragments_size * MAX_FRAGMENTS);
@@ -117,14 +122,21 @@ int vchiq_platform_init(struct platform_
 		return -ENOMEM;
 	}
 
+	if (!IS_VC_SAFE(slot_phys)) {
+		dev_err(dev, "allocated DMA memory %pad is not VC-safe\n",
+			&slot_phys);
+		return -ENOMEM;
+	}
+
 	WARN_ON(((unsigned long)slot_mem & (PAGE_SIZE - 1)) != 0);
+	channelbase = VC_SAFE(slot_phys);
 
 	vchiq_slot_zero = vchiq_init_slots(slot_mem, slot_mem_size);
 	if (!vchiq_slot_zero)
 		return -EINVAL;
 
 	vchiq_slot_zero->platform_data[VCHIQ_PLATFORM_FRAGMENTS_OFFSET_IDX] =
-		(int)slot_phys + slot_mem_size;
+		channelbase + slot_mem_size;
 	vchiq_slot_zero->platform_data[VCHIQ_PLATFORM_FRAGMENTS_COUNT_IDX] =
 		MAX_FRAGMENTS;
 
@@ -158,7 +170,6 @@ int vchiq_platform_init(struct platform_
 	}
 
 	/* Send the base address of the slots to VideoCore */
-	channelbase = slot_phys;
 	err = rpi_firmware_property(fw, RPI_FIRMWARE_VCHIQ_INIT,
 				    &channelbase, sizeof(channelbase));
 	if (err || channelbase) {
@@ -244,7 +255,7 @@ vchiq_prepare_bulk_data(struct vchiq_bul
 	if (!pagelistinfo)
 		return VCHIQ_ERROR;
 
-	bulk->data = (void *)(unsigned long)pagelistinfo->dma_addr;
+	bulk->data = (void *)VC_SAFE(pagelistinfo->dma_addr);
 
 	/*
 	 * Store the pagelistinfo address in remote_data,
@@ -522,25 +533,60 @@ create_pagelist(char __user *buf, size_t
 
 	/* Combine adjacent blocks for performance */
 	k = 0;
-	for_each_sg(scatterlist, sg, dma_buffers, i) {
-		u32 len = sg_dma_len(sg);
-		u32 addr = sg_dma_address(sg);
-
-		/* Note: addrs is the address + page_count - 1
-		 * The firmware expects blocks after the first to be page-
-		 * aligned and a multiple of the page size
-		 */
-		WARN_ON(len == 0);
-		WARN_ON(i && (i != (dma_buffers - 1)) && (len & ~PAGE_MASK));
-		WARN_ON(i && (addr & ~PAGE_MASK));
-		if (k > 0 &&
-		    ((addrs[k - 1] & PAGE_MASK) +
-		     (((addrs[k - 1] & ~PAGE_MASK) + 1) << PAGE_SHIFT))
-		    == (addr & PAGE_MASK))
-			addrs[k - 1] += ((len + PAGE_SIZE - 1) >> PAGE_SHIFT);
-		else
-			addrs[k++] = (addr & PAGE_MASK) |
-				(((len + PAGE_SIZE - 1) >> PAGE_SHIFT) - 1);
+	if (g_use_36bit_addrs) {
+		for_each_sg(scatterlist, sg, dma_buffers, i) {
+			u32 len = sg_dma_len(sg);
+			u64 addr = sg_dma_address(sg);
+			u32 page_id = (u32)((addr >> 4) & ~0xff);
+			u32 sg_pages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
+
+			/* Note: addrs is the address + page_count - 1
+			 * The firmware expects blocks after the first to be page-
+			 * aligned and a multiple of the page size
+			 */
+			WARN_ON(len == 0);
+			WARN_ON(i &&
+				(i != (dma_buffers - 1)) && (len & ~PAGE_MASK));
+			WARN_ON(i && (addr & ~PAGE_MASK));
+			WARN_ON(upper_32_bits(addr) > 0xf);
+			if (k > 0 &&
+			    ((addrs[k - 1] & ~0xff) +
+			     (((addrs[k - 1] & 0xff) + 1) << 8)
+			     == page_id)) {
+				u32 inc_pages = min(sg_pages,
+						    0xff - (addrs[k - 1] & 0xff));
+				addrs[k - 1] += inc_pages;
+				page_id += inc_pages << 8;
+				sg_pages -= inc_pages;
+			}
+			while (sg_pages) {
+				u32 inc_pages = min(sg_pages, 0x100u);
+				addrs[k++] = page_id | (inc_pages - 1);
+				page_id += inc_pages << 8;
+				sg_pages -= inc_pages;
+			}
+		}
+	} else {
+		for_each_sg(scatterlist, sg, dma_buffers, i) {
+			u32 len = sg_dma_len(sg);
+			u32 addr = VC_SAFE(sg_dma_address(sg));
+			u32 new_pages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
+
+			/* Note: addrs is the address + page_count - 1
+			 * The firmware expects blocks after the first to be page-
+			 * aligned and a multiple of the page size
+			 */
+			WARN_ON(len == 0);
+			WARN_ON(i && (i != (dma_buffers - 1)) && (len & ~PAGE_MASK));
+			WARN_ON(i && (addr & ~PAGE_MASK));
+			if (k > 0 &&
+			    ((addrs[k - 1] & PAGE_MASK) +
+			     (((addrs[k - 1] & ~PAGE_MASK) + 1) << PAGE_SHIFT))
+			    == (addr & PAGE_MASK))
+				addrs[k - 1] += new_pages;
+			else
+				addrs[k++] = (addr & PAGE_MASK) | (new_pages - 1);
+		}
 	}
 
 	/* Partial cache lines (fragments) require special measures */
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
@@ -149,6 +149,11 @@ static struct vchiq_drvdata bcm2836_drvd
 	.cache_line_size = 64,
 };
 
+static struct vchiq_drvdata bcm2838_drvdata = {
+	.cache_line_size = 64,
+	.use_36bit_addrs = true,
+};
+
 static const char *const ioctl_names[] = {
 	"CONNECT",
 	"SHUTDOWN",
@@ -3164,6 +3169,7 @@ void vchiq_platform_conn_state_changed(s
 static const struct of_device_id vchiq_of_match[] = {
 	{ .compatible = "brcm,bcm2835-vchiq", .data = &bcm2835_drvdata },
 	{ .compatible = "brcm,bcm2836-vchiq", .data = &bcm2836_drvdata },
+	{ .compatible = "brcm,bcm2838-vchiq", .data = &bcm2838_drvdata },
 	{},
 };
 MODULE_DEVICE_TABLE(of, vchiq_of_match);
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.h
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.h
@@ -97,6 +97,7 @@ struct vchiq_arm_state {
 
 struct vchiq_drvdata {
 	const unsigned int cache_line_size;
+	const bool use_36bit_addrs;
 	struct rpi_firmware *fw;
 };