forked from openwrt/openwrt
/
950-0605-xhci-refactor-out-TRBS_PER_SEGMENT-define-in-runtime.patch
258 lines (235 loc) · 9.21 KB
/
950-0605-xhci-refactor-out-TRBS_PER_SEGMENT-define-in-runtime.patch
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
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
From cbe6a244c89bd8826dbf007f8d26d1859f03b381 Mon Sep 17 00:00:00 2001
From: Jonathan Bell <jonathan@raspberrypi.com>
Date: Mon, 13 Dec 2021 15:05:56 +0000
Subject: [PATCH] xhci: refactor out TRBS_PER_SEGMENT define in runtime
code
In anticipation of adjusting the number of utilised TRBs in a ring
segment, add trbs_per_seg to struct xhci_ring and use this instead
of a compile-time define.
Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
---
drivers/usb/host/xhci-mem.c | 48 +++++++++++++++++++-----------------
drivers/usb/host/xhci-ring.c | 20 +++++++++------
drivers/usb/host/xhci.c | 6 ++---
drivers/usb/host/xhci.h | 1 +
4 files changed, 42 insertions(+), 33 deletions(-)
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -98,6 +98,7 @@ static void xhci_free_segments_for_ring(
*/
static void xhci_link_segments(struct xhci_segment *prev,
struct xhci_segment *next,
+ unsigned int trbs_per_seg,
enum xhci_ring_type type, bool chain_links)
{
u32 val;
@@ -106,16 +107,16 @@ static void xhci_link_segments(struct xh
return;
prev->next = next;
if (type != TYPE_EVENT) {
- prev->trbs[TRBS_PER_SEGMENT-1].link.segment_ptr =
+ prev->trbs[trbs_per_seg - 1].link.segment_ptr =
cpu_to_le64(next->dma);
/* Set the last TRB in the segment to have a TRB type ID of Link TRB */
- val = le32_to_cpu(prev->trbs[TRBS_PER_SEGMENT-1].link.control);
+ val = le32_to_cpu(prev->trbs[trbs_per_seg - 1].link.control);
val &= ~TRB_TYPE_BITMASK;
val |= TRB_TYPE(TRB_LINK);
if (chain_links)
val |= TRB_CHAIN;
- prev->trbs[TRBS_PER_SEGMENT-1].link.control = cpu_to_le32(val);
+ prev->trbs[trbs_per_seg - 1].link.control = cpu_to_le32(val);
}
}
@@ -139,15 +140,17 @@ static void xhci_link_rings(struct xhci_
(xhci->quirks & XHCI_AMD_0x96_HOST)));
next = ring->enq_seg->next;
- xhci_link_segments(ring->enq_seg, first, ring->type, chain_links);
- xhci_link_segments(last, next, ring->type, chain_links);
+ xhci_link_segments(ring->enq_seg, first, ring->trbs_per_seg,
+ ring->type, chain_links);
+ xhci_link_segments(last, next, ring->trbs_per_seg,
+ ring->type, chain_links);
ring->num_segs += num_segs;
- ring->num_trbs_free += (TRBS_PER_SEGMENT - 1) * num_segs;
+ ring->num_trbs_free += (ring->trbs_per_seg - 1) * num_segs;
if (ring->type != TYPE_EVENT && ring->enq_seg == ring->last_seg) {
- ring->last_seg->trbs[TRBS_PER_SEGMENT-1].link.control
+ ring->last_seg->trbs[ring->trbs_per_seg - 1].link.control
&= ~cpu_to_le32(LINK_TOGGLE);
- last->trbs[TRBS_PER_SEGMENT-1].link.control
+ last->trbs[ring->trbs_per_seg - 1].link.control
|= cpu_to_le32(LINK_TOGGLE);
ring->last_seg = last;
}
@@ -314,14 +317,15 @@ void xhci_initialize_ring_info(struct xh
* Each segment has a link TRB, and leave an extra TRB for SW
* accounting purpose
*/
- ring->num_trbs_free = ring->num_segs * (TRBS_PER_SEGMENT - 1) - 1;
+ ring->num_trbs_free = ring->num_segs * (ring->trbs_per_seg - 1) - 1;
}
/* Allocate segments and link them for a ring */
static int xhci_alloc_segments_for_ring(struct xhci_hcd *xhci,
struct xhci_segment **first, struct xhci_segment **last,
- unsigned int num_segs, unsigned int cycle_state,
- enum xhci_ring_type type, unsigned int max_packet, gfp_t flags)
+ unsigned int num_segs, unsigned int trbs_per_seg,
+ unsigned int cycle_state, enum xhci_ring_type type,
+ unsigned int max_packet, gfp_t flags)
{
struct xhci_segment *prev;
bool chain_links;
@@ -350,12 +354,12 @@ static int xhci_alloc_segments_for_ring(
}
return -ENOMEM;
}
- xhci_link_segments(prev, next, type, chain_links);
+ xhci_link_segments(prev, next, trbs_per_seg, type, chain_links);
prev = next;
num_segs--;
}
- xhci_link_segments(prev, *first, type, chain_links);
+ xhci_link_segments(prev, *first, trbs_per_seg, type, chain_links);
*last = prev;
return 0;
@@ -387,16 +391,17 @@ struct xhci_ring *xhci_ring_alloc(struct
if (num_segs == 0)
return ring;
+ ring->trbs_per_seg = TRBS_PER_SEGMENT;
ret = xhci_alloc_segments_for_ring(xhci, &ring->first_seg,
- &ring->last_seg, num_segs, cycle_state, type,
- max_packet, flags);
+ &ring->last_seg, num_segs, ring->trbs_per_seg,
+ cycle_state, type, max_packet, flags);
if (ret)
goto fail;
/* Only event ring does not use link TRB */
if (type != TYPE_EVENT) {
/* See section 4.9.2.1 and 6.4.4.1 */
- ring->last_seg->trbs[TRBS_PER_SEGMENT - 1].link.control |=
+ ring->last_seg->trbs[ring->trbs_per_seg - 1].link.control |=
cpu_to_le32(LINK_TOGGLE);
}
xhci_initialize_ring_info(ring, cycle_state);
@@ -429,16 +434,15 @@ int xhci_ring_expansion(struct xhci_hcd
unsigned int num_segs_needed;
int ret;
- num_segs_needed = (num_trbs + (TRBS_PER_SEGMENT - 1) - 1) /
- (TRBS_PER_SEGMENT - 1);
-
+ num_segs_needed = (num_trbs + (ring->trbs_per_seg - 1) - 1) /
+ (ring->trbs_per_seg - 1);
/* Allocate number of segments we needed, or double the ring size */
num_segs = ring->num_segs > num_segs_needed ?
ring->num_segs : num_segs_needed;
ret = xhci_alloc_segments_for_ring(xhci, &first, &last,
- num_segs, ring->cycle_state, ring->type,
- ring->bounce_buf_len, flags);
+ num_segs, ring->trbs_per_seg, ring->cycle_state,
+ ring->type, ring->bounce_buf_len, flags);
if (ret)
return -ENOMEM;
@@ -1811,7 +1815,7 @@ int xhci_alloc_erst(struct xhci_hcd *xhc
for (val = 0; val < evt_ring->num_segs; val++) {
entry = &erst->entries[val];
entry->seg_addr = cpu_to_le64(seg->dma);
- entry->seg_size = cpu_to_le32(TRBS_PER_SEGMENT);
+ entry->seg_size = cpu_to_le32(evt_ring->trbs_per_seg);
entry->rsvd = 0;
seg = seg->next;
}
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -90,15 +90,16 @@ static bool trb_is_link(union xhci_trb *
return TRB_TYPE_LINK_LE32(trb->link.control);
}
-static bool last_trb_on_seg(struct xhci_segment *seg, union xhci_trb *trb)
+static bool last_trb_on_seg(struct xhci_segment *seg,
+ unsigned int trbs_per_seg, union xhci_trb *trb)
{
- return trb == &seg->trbs[TRBS_PER_SEGMENT - 1];
+ return trb == &seg->trbs[trbs_per_seg - 1];
}
static bool last_trb_on_ring(struct xhci_ring *ring,
struct xhci_segment *seg, union xhci_trb *trb)
{
- return last_trb_on_seg(seg, trb) && (seg->next == ring->first_seg);
+ return last_trb_on_seg(seg, ring->trbs_per_seg, trb) && (seg->next == ring->first_seg);
}
static bool link_trb_toggles_cycle(union xhci_trb *trb)
@@ -161,7 +162,8 @@ void inc_deq(struct xhci_hcd *xhci, stru
/* event ring doesn't have link trbs, check for last trb */
if (ring->type == TYPE_EVENT) {
- if (!last_trb_on_seg(ring->deq_seg, ring->dequeue)) {
+ if (!last_trb_on_seg(ring->deq_seg, ring->trbs_per_seg,
+ ring->dequeue)) {
ring->dequeue++;
goto out;
}
@@ -174,7 +176,8 @@ void inc_deq(struct xhci_hcd *xhci, stru
/* All other rings have link trbs */
if (!trb_is_link(ring->dequeue)) {
- if (last_trb_on_seg(ring->deq_seg, ring->dequeue)) {
+ if (last_trb_on_seg(ring->deq_seg, ring->trbs_per_seg,
+ ring->dequeue)) {
xhci_warn(xhci, "Missing link TRB at end of segment\n");
} else {
ring->dequeue++;
@@ -225,7 +228,7 @@ static void inc_enq(struct xhci_hcd *xhc
if (!trb_is_link(ring->enqueue))
ring->num_trbs_free--;
- if (last_trb_on_seg(ring->enq_seg, ring->enqueue)) {
+ if (last_trb_on_seg(ring->enq_seg, ring->trbs_per_seg, ring->enqueue)) {
xhci_err(xhci, "Tried to move enqueue past ring segment\n");
return;
}
@@ -3153,7 +3156,7 @@ irqreturn_t xhci_irq(struct usb_hcd *hcd
* that clears the EHB.
*/
while (xhci_handle_event(xhci) > 0) {
- if (event_loop++ < TRBS_PER_SEGMENT / 2)
+ if (event_loop++ < xhci->event_ring->trbs_per_seg / 2)
continue;
xhci_update_erst_dequeue(xhci, event_ring_deq);
event_ring_deq = xhci->event_ring->dequeue;
@@ -3295,7 +3298,8 @@ static int prepare_ring(struct xhci_hcd
}
}
- if (last_trb_on_seg(ep_ring->enq_seg, ep_ring->enqueue)) {
+ if (last_trb_on_seg(ep_ring->enq_seg, ep_ring->trbs_per_seg,
+ ep_ring->enqueue)) {
xhci_warn(xhci, "Missing link TRB at end of ring segment\n");
return -EINVAL;
}
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -879,8 +879,8 @@ static void xhci_clear_command_ring(stru
seg = ring->deq_seg;
do {
memset(seg->trbs, 0,
- sizeof(union xhci_trb) * (TRBS_PER_SEGMENT - 1));
- seg->trbs[TRBS_PER_SEGMENT - 1].link.control &=
+ sizeof(union xhci_trb) * (ring->trbs_per_seg - 1));
+ seg->trbs[ring->trbs_per_seg - 1].link.control &=
cpu_to_le32(~TRB_CYCLE);
seg = seg->next;
} while (seg != ring->deq_seg);
@@ -891,7 +891,7 @@ static void xhci_clear_command_ring(stru
ring->enq_seg = ring->deq_seg;
ring->enqueue = ring->dequeue;
- ring->num_trbs_free = ring->num_segs * (TRBS_PER_SEGMENT - 1) - 1;
+ ring->num_trbs_free = ring->num_segs * (ring->trbs_per_seg - 1) - 1;
/*
* Ring is now zeroed, so the HW should look for change of ownership
* when the cycle bit is set to 1.
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1635,6 +1635,7 @@ struct xhci_ring {
unsigned int num_trbs_free;
unsigned int num_trbs_free_temp;
unsigned int bounce_buf_len;
+ unsigned int trbs_per_seg;
enum xhci_ring_type type;
bool last_td_was_short;
struct radix_tree_root *trb_address_map;