bf0dbbe2d5daad8ea88f1e52e013e7bf4a83b820
1 /*
2 * Copyright (c) 2011-2013, Texas Instruments Incorporated
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * * Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *
12 * * Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * * Neither the name of Texas Instruments Incorporated nor the names of
17 * its contributors may be used to endorse or promote products derived
18 * from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
21 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
22 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
24 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
26 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
27 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
28 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
29 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
30 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32 /** ============================================================================
33 * @file VirtQueue.c
34 *
35 * @brief Virtio Queue implementation for BIOS
36 *
37 * Differences between BIOS version and Linux kernel (include/linux/virtio.h):
38 * - Renamed module from virtio.h to VirtQueue_Object.h to match the API prefixes;
39 * - BIOS (XDC) types and CamelCasing used;
40 * - virtio_device concept removed (i.e, assumes no containing device);
41 * - simplified scatterlist from Linux version;
42 * - VirtQueue_Objects are created statically here, so just added a VirtQueue_Object_init()
43 * fxn to take the place of the Virtio vring_new_virtqueue() API;
44 * - The notify function is implicit in the implementation, and not provided
45 * by the client, as it is in Linux virtio.
46 *
47 * All VirtQueue operations can be called in any context.
48 *
49 * The virtio header should be included in an application as follows:
50 * @code
51 * #include <ti/ipc/rpmsg/VirtQueue.h>
52 * @endcode
53 *
54 */
56 #include <xdc/std.h>
57 #include <xdc/runtime/System.h>
58 #include <xdc/runtime/Assert.h>
59 #include <xdc/runtime/Error.h>
60 #include <xdc/runtime/Memory.h>
61 #include <xdc/runtime/Log.h>
62 #include <xdc/runtime/Diags.h>
63 #include <xdc/runtime/SysMin.h>
65 #include <ti/sysbios/knl/Clock.h>
66 #include <ti/sysbios/family/c66/Cache.h>
67 #include <ti/sysbios/knl/Swi.h>
69 #include <ti/sdo/ipc/notifyDrivers/IInterrupt.h>
70 #include <ti/ipc/family/tci6638/Interrupt.h>
71 #include <ti/ipc/remoteproc/Resource.h>
73 #include <ti/ipc/MultiProc.h>
75 #include "package/internal/VirtQueue.xdc.h"
77 #include <string.h>
79 #include <ti/ipc/rpmsg/virtio_ring.h>
81 /* Used for defining the size of the virtqueue registry */
82 #define NUM_QUEUES 2
84 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
85 #define RP_MSG_BUFS_SPACE (VirtQueue_RP_MSG_NUM_BUFS * VirtQueue_RP_MSG_BUF_SIZE * 2)
87 /* With 256 buffers, our vring will occupy 3 pages */
88 #define RP_MSG_RING_SIZE ((DIV_ROUND_UP(vring_size(VirtQueue_RP_MSG_NUM_BUFS, \
89 VirtQueue_RP_MSG_VRING_ALIGN), VirtQueue_PAGE_SIZE)) * VirtQueue_PAGE_SIZE)
91 /* The total IPC space needed to communicate with a remote processor */
92 #define RPMSG_IPC_MEM (RP_MSG_BUFS_SPACE + 2 * RP_MSG_RING_SIZE)
94 #define ID_DSP_TO_A9 0
95 #define ID_A9_TO_DSP 1
97 extern volatile cregister Uns DNUM;
99 static VirtQueue_Object *queueRegistry[NUM_QUEUES] = {NULL};
101 static inline Void * mapPAtoVA(UInt pa)
102 {
103 return (Void *)(pa | 0x80000000);
104 }
106 static inline UInt mapVAtoPA(Void * va)
107 {
108 return ((UInt)va & 0x000fffffU) | 0xe1000000U;
109 }
111 /*
112 * ======== VirtQueue_init ========
113 */
114 Void VirtQueue_init()
115 {
116 extern cregister volatile UInt DNUM;
117 UInt16 procId;
119 /*
120 * VirtQueue_init() must be called before MultiProcSetup_init().
121 * (Check the xdc_runtime_Startup_firstFxns__A in the XDC generated code)
122 * Abort if the procId has already been set. We must set it!
123 */
124 if (MultiProc_self() != MultiProc_INVALIDID) {
125 System_abort("VirtQueue_init(): MultiProc_self already set!");
126 return;
127 }
129 procId = DNUM + 1;
131 /* Set the local ID */
132 MultiProc_setLocalId(procId);
133 }
135 /*
136 * ======== VirtQueue_Instance_init ========
137 */
138 Void VirtQueue_Instance_init(VirtQueue_Object *vq, UInt16 remoteProcId,
139 const VirtQueue_Params *params)
140 {
141 void *vring_phys = NULL;
142 Error_Block eb;
144 VirtQueue_module->traceBufPtr = Resource_getTraceBufPtr();
146 Error_init(&eb);
148 vq->vringPtr = Memory_calloc(NULL, sizeof(struct vring), 0, &eb);
149 Assert_isTrue((vq->vringPtr != NULL), NULL);
151 vq->callback = params->callback;
152 vq->id = VirtQueue_module->numQueues++;
153 vq->procId = remoteProcId;
154 vq->last_avail_idx = 0;
155 vq->last_used_idx = 0;
156 vq->num_free = VirtQueue_RP_MSG_NUM_BUFS;
157 vq->swiHandle = params->swiHandle;
159 switch (vq->id) {
160 case ID_DSP_TO_A9:
161 vring_phys = (struct vring *) (VirtQueue_CORE0_MEM_VRING0 +
162 (DNUM * VirtQueue_VRING_OFFSET));
163 break;
164 case ID_A9_TO_DSP:
165 vring_phys = (struct vring *) (VirtQueue_CORE0_MEM_VRING1 +
166 (DNUM * VirtQueue_VRING_OFFSET));
167 break;
168 }
170 Log_print3(Diags_USER1,
171 "vring: %d 0x%x (0x%x)\n", vq->id, (IArg)vring_phys,
172 RP_MSG_RING_SIZE);
174 vring_init(vq->vringPtr, VirtQueue_RP_MSG_NUM_BUFS, vring_phys, VirtQueue_RP_MSG_VRING_ALIGN);
176 queueRegistry[vq->id] = vq;
177 }
179 /*
180 * ======== VirtQueue_kick ========
181 */
182 Void VirtQueue_kick(VirtQueue_Handle vq)
183 {
184 IInterrupt_IntInfo intInfo;
185 struct vring *vring = vq->vringPtr;
187 /* For now, simply interrupt remote processor */
188 if (vring->avail->flags & VRING_AVAIL_F_NO_INTERRUPT) {
189 Log_print0(Diags_USER1,
190 "VirtQueue_kick: no kick because of VRING_AVAIL_F_NO_INTERRUPT\n");
191 return;
192 }
194 Log_print2(Diags_USER1,
195 "VirtQueue_kick: Sending interrupt to proc %d with payload 0x%x\n",
196 (IArg)vq->procId, (IArg)vq->id);
198 intInfo.localIntId = Interrupt_SRCS_BITPOS_CORE0;
199 Interrupt_intSend(vq->procId, &intInfo, vq->id);
200 }
202 /*
203 * ======== VirtQueue_addUsedBuf ========
204 */
205 Int VirtQueue_addUsedBuf(VirtQueue_Handle vq, Int16 head)
206 {
207 struct vring_used_elem *used;
208 struct vring *vring = vq->vringPtr;
210 if ((head > vring->num) || (head < 0)) {
211 Error_raise(NULL, Error_E_generic, 0, 0);
212 }
214 /*
215 * The virtqueue contains a ring of used buffers. Get a pointer to the
216 * next entry in that used ring.
217 */
218 used = &vring->used->ring[vring->used->idx % vring->num];
219 used->id = head;
220 used->len = VirtQueue_RP_MSG_BUF_SIZE;
222 vring->used->idx++;
224 return (0);
225 }
227 /*
228 * ======== VirtQueue_addAvailBuf ========
229 */
230 Int VirtQueue_addAvailBuf(VirtQueue_Object *vq, Void *buf)
231 {
232 UInt16 avail;
233 struct vring *vring = vq->vringPtr;
235 if (vq->num_free == 0) {
236 /* There's no more space */
237 Error_raise(NULL, Error_E_generic, 0, 0);
238 }
240 vq->num_free--;
242 avail = vring->avail->idx++ % vring->num;
244 vring->desc[avail].addr = mapVAtoPA(buf);
245 vring->desc[avail].len = VirtQueue_RP_MSG_BUF_SIZE;
247 return (vq->num_free);
248 }
250 /*
251 * ======== VirtQueue_getUsedBuf ========
252 */
253 Void *VirtQueue_getUsedBuf(VirtQueue_Object *vq)
254 {
255 UInt16 head;
256 Void *buf;
257 struct vring *vring = vq->vringPtr;
259 /* There's nothing available? */
260 if (vq->last_used_idx == vring->used->idx) {
261 return (NULL);
262 }
264 head = vring->used->ring[vq->last_used_idx % vring->num].id;
265 vq->last_used_idx++;
266 vq->num_free++;
268 buf = mapPAtoVA(vring->desc[head].addr);
270 return (buf);
271 }
273 /*
274 * ======== VirtQueue_getAvailBuf ========
275 */
276 Int16 VirtQueue_getAvailBuf(VirtQueue_Handle vq, Void **buf)
277 {
278 UInt16 head;
279 struct vring *vring = vq->vringPtr;
281 Log_print6(Diags_USER1, "getAvailBuf vq: 0x%x %d %d %d 0x%x 0x%x\n",
282 (IArg)vq,
283 vq->last_avail_idx, vring->avail->idx, vring->num,
284 (IArg)&vring->avail, (IArg)vring->avail);
286 /* There's nothing available? */
287 if (vq->last_avail_idx == vring->avail->idx) {
288 /* We need to know about added buffers */
289 vring->used->flags &= ~VRING_USED_F_NO_NOTIFY;
290 /* check again after setting flag */
291 if (vq->last_avail_idx == vring->avail->idx)
292 return -1;
293 }
295 /* No need to be kicked about added buffers anymore */
296 vring->used->flags |= VRING_USED_F_NO_NOTIFY;
298 /*
299 * Grab the next descriptor number they're advertising, and increment
300 * the index we've seen.
301 */
302 head = vring->avail->ring[vq->last_avail_idx++ % vring->num];
304 *buf = mapPAtoVA(vring->desc[head].addr);
306 return (head);
307 }
309 /*
310 * ======== VirtQueue_isr ========
311 * Note 'msg' is ignored: it is only used where there is a mailbox payload.
312 */
313 Void VirtQueue_isr(UArg msg)
314 {
315 VirtQueue_Object *vq;
317 Log_print1(Diags_USER1, "VirtQueue_isr received msg = 0x%x\n", msg);
319 vq = queueRegistry[0];
320 if (vq) {
321 vq->callback(vq);
322 }
323 vq = queueRegistry[1];
324 if (vq) {
325 vq->callback(vq);
326 }
327 }
329 /*
330 * ======== VirtQueue_startup ========
331 */
332 Void VirtQueue_startup(UInt16 remoteProcId, Bool isHost)
333 {
334 IInterrupt_IntInfo intInfo;
336 intInfo.intVectorId = Interrupt_DSPINT;
337 intInfo.localIntId = Interrupt_SRCS_BITPOS_HOST;
340 /*
341 * Wait for first kick from host, which happens to coincide with the
342 * priming of host's receive buffers, indicating host is ready to send.
343 * Since interrupt is cleared, we throw away this first kick, which is
344 * OK since we don't process this in the ISR anyway.
345 */
346 Log_print0(Diags_USER1, "VirtQueue_startup: Polling for host int...\n");
347 while (!Interrupt_checkAndClear(remoteProcId, &intInfo));
349 Interrupt_intRegister(remoteProcId, &intInfo, (Fxn)VirtQueue_isr, NULL);
351 Log_print0(Diags_USER1, "Passed VirtQueue_startup\n");
352 }
354 /* By convention, Host VirtQueues host are the even number in the pair */
355 Bool VirtQueue_isSlave(VirtQueue_Handle vq)
356 {
357 return (vq->id & 0x1);
358 }
360 Bool VirtQueue_isHost(VirtQueue_Handle vq)
361 {
362 return (~(vq->id & 0x1));
363 }
365 UInt16 VirtQueue_getId(VirtQueue_Handle vq)
366 {
367 return (vq->id);
368 }
370 Swi_Handle VirtQueue_getSwiHandle(VirtQueue_Handle vq)
371 {
372 return (vq->swiHandle);
373 }
375 #define CACHE_WB_TICK_PERIOD 5
377 /*
378 * ======== VirtQueue_cacheWb ========
379 *
380 * Used for flushing SysMin trace buffer.
381 */
382 Void VirtQueue_cacheWb()
383 {
384 static UInt32 oldticks = 0;
385 UInt32 newticks;
387 newticks = Clock_getTicks();
388 if (newticks - oldticks < (UInt32)CACHE_WB_TICK_PERIOD) {
389 /* Don't keep flushing cache */
390 return;
391 }
393 oldticks = newticks;
395 /* Flush the cache of the SysMin buffer only: */
396 Assert_isTrue((VirtQueue_module->traceBufPtr != NULL), NULL);
397 Cache_wb(VirtQueue_module->traceBufPtr, SysMin_bufSize, Cache_Type_ALL,
398 FALSE);
399 }