1// SPDX-License-Identifier: GPL-2.0-or-later
2/* backing_ops.c - query/set operations on saved SPU context.
3 *
4 * Copyright (C) IBM 2005
5 * Author: Mark Nutter <mnutter@us.ibm.com>
6 *
7 * These register operations allow SPUFS to operate on saved
8 * SPU contexts rather than hardware.
9 */
10
11#include <linux/errno.h>
12#include <linux/sched.h>
13#include <linux/kernel.h>
14#include <linux/mm.h>
15#include <linux/vmalloc.h>
16#include <linux/smp.h>
17#include <linux/stddef.h>
18#include <linux/unistd.h>
19#include <linux/poll.h>
20
21#include <asm/io.h>
22#include <asm/spu.h>
23#include <asm/spu_csa.h>
24#include <asm/spu_info.h>
25#include <asm/mmu_context.h>
26#include "spufs.h"
27
28/*
29 * Reads/writes to various problem and priv2 registers require
30 * state changes, i.e. generate SPU events, modify channel
31 * counts, etc.
32 */
33
34static void gen_spu_event(struct spu_context *ctx, u32 event)
35{
36 u64 ch0_cnt;
37 u64 ch0_data;
38 u64 ch1_data;
39
40 ch0_cnt = ctx->csa.spu_chnlcnt_RW[0];
41 ch0_data = ctx->csa.spu_chnldata_RW[0];
42 ch1_data = ctx->csa.spu_chnldata_RW[1];
43 ctx->csa.spu_chnldata_RW[0] |= event;
44 if ((ch0_cnt == 0) && !(ch0_data & event) && (ch1_data & event)) {
45 ctx->csa.spu_chnlcnt_RW[0] = 1;
46 }
47}
48
49static int spu_backing_mbox_read(struct spu_context *ctx, u32 * data)
50{
51 u32 mbox_stat;
52 int ret = 0;
53
54 spin_lock(lock: &ctx->csa.register_lock);
55 mbox_stat = ctx->csa.prob.mb_stat_R;
56 if (mbox_stat & 0x0000ff) {
57 /* Read the first available word.
58 * Implementation note: the depth
59 * of pu_mb_R is currently 1.
60 */
61 *data = ctx->csa.prob.pu_mb_R;
62 ctx->csa.prob.mb_stat_R &= ~(0x0000ff);
63 ctx->csa.spu_chnlcnt_RW[28] = 1;
64 gen_spu_event(ctx, event: MFC_PU_MAILBOX_AVAILABLE_EVENT);
65 ret = 4;
66 }
67 spin_unlock(lock: &ctx->csa.register_lock);
68 return ret;
69}
70
71static u32 spu_backing_mbox_stat_read(struct spu_context *ctx)
72{
73 return ctx->csa.prob.mb_stat_R;
74}
75
76static __poll_t spu_backing_mbox_stat_poll(struct spu_context *ctx,
77 __poll_t events)
78{
79 __poll_t ret;
80 u32 stat;
81
82 ret = 0;
83 spin_lock_irq(lock: &ctx->csa.register_lock);
84 stat = ctx->csa.prob.mb_stat_R;
85
86 /* if the requested event is there, return the poll
87 mask, otherwise enable the interrupt to get notified,
88 but first mark any pending interrupts as done so
89 we don't get woken up unnecessarily */
90
91 if (events & (EPOLLIN | EPOLLRDNORM)) {
92 if (stat & 0xff0000)
93 ret |= EPOLLIN | EPOLLRDNORM;
94 else {
95 ctx->csa.priv1.int_stat_class2_RW &=
96 ~CLASS2_MAILBOX_INTR;
97 ctx->csa.priv1.int_mask_class2_RW |=
98 CLASS2_ENABLE_MAILBOX_INTR;
99 }
100 }
101 if (events & (EPOLLOUT | EPOLLWRNORM)) {
102 if (stat & 0x00ff00)
103 ret = EPOLLOUT | EPOLLWRNORM;
104 else {
105 ctx->csa.priv1.int_stat_class2_RW &=
106 ~CLASS2_MAILBOX_THRESHOLD_INTR;
107 ctx->csa.priv1.int_mask_class2_RW |=
108 CLASS2_ENABLE_MAILBOX_THRESHOLD_INTR;
109 }
110 }
111 spin_unlock_irq(lock: &ctx->csa.register_lock);
112 return ret;
113}
114
115static int spu_backing_ibox_read(struct spu_context *ctx, u32 * data)
116{
117 int ret;
118
119 spin_lock(lock: &ctx->csa.register_lock);
120 if (ctx->csa.prob.mb_stat_R & 0xff0000) {
121 /* Read the first available word.
122 * Implementation note: the depth
123 * of puint_mb_R is currently 1.
124 */
125 *data = ctx->csa.priv2.puint_mb_R;
126 ctx->csa.prob.mb_stat_R &= ~(0xff0000);
127 ctx->csa.spu_chnlcnt_RW[30] = 1;
128 gen_spu_event(ctx, event: MFC_PU_INT_MAILBOX_AVAILABLE_EVENT);
129 ret = 4;
130 } else {
131 /* make sure we get woken up by the interrupt */
132 ctx->csa.priv1.int_mask_class2_RW |= CLASS2_ENABLE_MAILBOX_INTR;
133 ret = 0;
134 }
135 spin_unlock(lock: &ctx->csa.register_lock);
136 return ret;
137}
138
139static int spu_backing_wbox_write(struct spu_context *ctx, u32 data)
140{
141 int ret;
142
143 spin_lock(lock: &ctx->csa.register_lock);
144 if ((ctx->csa.prob.mb_stat_R) & 0x00ff00) {
145 int slot = ctx->csa.spu_chnlcnt_RW[29];
146 int avail = (ctx->csa.prob.mb_stat_R & 0x00ff00) >> 8;
147
148 /* We have space to write wbox_data.
149 * Implementation note: the depth
150 * of spu_mb_W is currently 4.
151 */
152 BUG_ON(avail != (4 - slot));
153 ctx->csa.spu_mailbox_data[slot] = data;
154 ctx->csa.spu_chnlcnt_RW[29] = ++slot;
155 ctx->csa.prob.mb_stat_R &= ~(0x00ff00);
156 ctx->csa.prob.mb_stat_R |= (((4 - slot) & 0xff) << 8);
157 gen_spu_event(ctx, event: MFC_SPU_MAILBOX_WRITTEN_EVENT);
158 ret = 4;
159 } else {
160 /* make sure we get woken up by the interrupt when space
161 becomes available */
162 ctx->csa.priv1.int_mask_class2_RW |=
163 CLASS2_ENABLE_MAILBOX_THRESHOLD_INTR;
164 ret = 0;
165 }
166 spin_unlock(lock: &ctx->csa.register_lock);
167 return ret;
168}
169
170static u32 spu_backing_signal1_read(struct spu_context *ctx)
171{
172 return ctx->csa.spu_chnldata_RW[3];
173}
174
175static void spu_backing_signal1_write(struct spu_context *ctx, u32 data)
176{
177 spin_lock(lock: &ctx->csa.register_lock);
178 if (ctx->csa.priv2.spu_cfg_RW & 0x1)
179 ctx->csa.spu_chnldata_RW[3] |= data;
180 else
181 ctx->csa.spu_chnldata_RW[3] = data;
182 ctx->csa.spu_chnlcnt_RW[3] = 1;
183 gen_spu_event(ctx, event: MFC_SIGNAL_1_EVENT);
184 spin_unlock(lock: &ctx->csa.register_lock);
185}
186
187static u32 spu_backing_signal2_read(struct spu_context *ctx)
188{
189 return ctx->csa.spu_chnldata_RW[4];
190}
191
192static void spu_backing_signal2_write(struct spu_context *ctx, u32 data)
193{
194 spin_lock(lock: &ctx->csa.register_lock);
195 if (ctx->csa.priv2.spu_cfg_RW & 0x2)
196 ctx->csa.spu_chnldata_RW[4] |= data;
197 else
198 ctx->csa.spu_chnldata_RW[4] = data;
199 ctx->csa.spu_chnlcnt_RW[4] = 1;
200 gen_spu_event(ctx, event: MFC_SIGNAL_2_EVENT);
201 spin_unlock(lock: &ctx->csa.register_lock);
202}
203
204static void spu_backing_signal1_type_set(struct spu_context *ctx, u64 val)
205{
206 u64 tmp;
207
208 spin_lock(lock: &ctx->csa.register_lock);
209 tmp = ctx->csa.priv2.spu_cfg_RW;
210 if (val)
211 tmp |= 1;
212 else
213 tmp &= ~1;
214 ctx->csa.priv2.spu_cfg_RW = tmp;
215 spin_unlock(lock: &ctx->csa.register_lock);
216}
217
218static u64 spu_backing_signal1_type_get(struct spu_context *ctx)
219{
220 return ((ctx->csa.priv2.spu_cfg_RW & 1) != 0);
221}
222
223static void spu_backing_signal2_type_set(struct spu_context *ctx, u64 val)
224{
225 u64 tmp;
226
227 spin_lock(lock: &ctx->csa.register_lock);
228 tmp = ctx->csa.priv2.spu_cfg_RW;
229 if (val)
230 tmp |= 2;
231 else
232 tmp &= ~2;
233 ctx->csa.priv2.spu_cfg_RW = tmp;
234 spin_unlock(lock: &ctx->csa.register_lock);
235}
236
237static u64 spu_backing_signal2_type_get(struct spu_context *ctx)
238{
239 return ((ctx->csa.priv2.spu_cfg_RW & 2) != 0);
240}
241
242static u32 spu_backing_npc_read(struct spu_context *ctx)
243{
244 return ctx->csa.prob.spu_npc_RW;
245}
246
247static void spu_backing_npc_write(struct spu_context *ctx, u32 val)
248{
249 ctx->csa.prob.spu_npc_RW = val;
250}
251
252static u32 spu_backing_status_read(struct spu_context *ctx)
253{
254 return ctx->csa.prob.spu_status_R;
255}
256
257static char *spu_backing_get_ls(struct spu_context *ctx)
258{
259 return ctx->csa.lscsa->ls;
260}
261
262static void spu_backing_privcntl_write(struct spu_context *ctx, u64 val)
263{
264 ctx->csa.priv2.spu_privcntl_RW = val;
265}
266
267static u32 spu_backing_runcntl_read(struct spu_context *ctx)
268{
269 return ctx->csa.prob.spu_runcntl_RW;
270}
271
272static void spu_backing_runcntl_write(struct spu_context *ctx, u32 val)
273{
274 spin_lock(lock: &ctx->csa.register_lock);
275 ctx->csa.prob.spu_runcntl_RW = val;
276 if (val & SPU_RUNCNTL_RUNNABLE) {
277 ctx->csa.prob.spu_status_R &=
278 ~SPU_STATUS_STOPPED_BY_STOP &
279 ~SPU_STATUS_STOPPED_BY_HALT &
280 ~SPU_STATUS_SINGLE_STEP &
281 ~SPU_STATUS_INVALID_INSTR &
282 ~SPU_STATUS_INVALID_CH;
283 ctx->csa.prob.spu_status_R |= SPU_STATUS_RUNNING;
284 } else {
285 ctx->csa.prob.spu_status_R &= ~SPU_STATUS_RUNNING;
286 }
287 spin_unlock(lock: &ctx->csa.register_lock);
288}
289
290static void spu_backing_runcntl_stop(struct spu_context *ctx)
291{
292 spu_backing_runcntl_write(ctx, val: SPU_RUNCNTL_STOP);
293}
294
295static void spu_backing_master_start(struct spu_context *ctx)
296{
297 struct spu_state *csa = &ctx->csa;
298 u64 sr1;
299
300 spin_lock(lock: &csa->register_lock);
301 sr1 = csa->priv1.mfc_sr1_RW | MFC_STATE1_MASTER_RUN_CONTROL_MASK;
302 csa->priv1.mfc_sr1_RW = sr1;
303 spin_unlock(lock: &csa->register_lock);
304}
305
306static void spu_backing_master_stop(struct spu_context *ctx)
307{
308 struct spu_state *csa = &ctx->csa;
309 u64 sr1;
310
311 spin_lock(lock: &csa->register_lock);
312 sr1 = csa->priv1.mfc_sr1_RW & ~MFC_STATE1_MASTER_RUN_CONTROL_MASK;
313 csa->priv1.mfc_sr1_RW = sr1;
314 spin_unlock(lock: &csa->register_lock);
315}
316
317static int spu_backing_set_mfc_query(struct spu_context * ctx, u32 mask,
318 u32 mode)
319{
320 struct spu_problem_collapsed *prob = &ctx->csa.prob;
321 int ret;
322
323 spin_lock(lock: &ctx->csa.register_lock);
324 ret = -EAGAIN;
325 if (prob->dma_querytype_RW)
326 goto out;
327 ret = 0;
328 /* FIXME: what are the side-effects of this? */
329 prob->dma_querymask_RW = mask;
330 prob->dma_querytype_RW = mode;
331 /* In the current implementation, the SPU context is always
332 * acquired in runnable state when new bits are added to the
333 * mask (tagwait), so it's sufficient just to mask
334 * dma_tagstatus_R with the 'mask' parameter here.
335 */
336 ctx->csa.prob.dma_tagstatus_R &= mask;
337out:
338 spin_unlock(lock: &ctx->csa.register_lock);
339
340 return ret;
341}
342
343static u32 spu_backing_read_mfc_tagstatus(struct spu_context * ctx)
344{
345 return ctx->csa.prob.dma_tagstatus_R;
346}
347
348static u32 spu_backing_get_mfc_free_elements(struct spu_context *ctx)
349{
350 return ctx->csa.prob.dma_qstatus_R;
351}
352
353static int spu_backing_send_mfc_command(struct spu_context *ctx,
354 struct mfc_dma_command *cmd)
355{
356 int ret;
357
358 spin_lock(lock: &ctx->csa.register_lock);
359 ret = -EAGAIN;
360 /* FIXME: set up priv2->puq */
361 spin_unlock(lock: &ctx->csa.register_lock);
362
363 return ret;
364}
365
366static void spu_backing_restart_dma(struct spu_context *ctx)
367{
368 ctx->csa.priv2.mfc_control_RW |= MFC_CNTL_RESTART_DMA_COMMAND;
369}
370
371struct spu_context_ops spu_backing_ops = {
372 .mbox_read = spu_backing_mbox_read,
373 .mbox_stat_read = spu_backing_mbox_stat_read,
374 .mbox_stat_poll = spu_backing_mbox_stat_poll,
375 .ibox_read = spu_backing_ibox_read,
376 .wbox_write = spu_backing_wbox_write,
377 .signal1_read = spu_backing_signal1_read,
378 .signal1_write = spu_backing_signal1_write,
379 .signal2_read = spu_backing_signal2_read,
380 .signal2_write = spu_backing_signal2_write,
381 .signal1_type_set = spu_backing_signal1_type_set,
382 .signal1_type_get = spu_backing_signal1_type_get,
383 .signal2_type_set = spu_backing_signal2_type_set,
384 .signal2_type_get = spu_backing_signal2_type_get,
385 .npc_read = spu_backing_npc_read,
386 .npc_write = spu_backing_npc_write,
387 .status_read = spu_backing_status_read,
388 .get_ls = spu_backing_get_ls,
389 .privcntl_write = spu_backing_privcntl_write,
390 .runcntl_read = spu_backing_runcntl_read,
391 .runcntl_write = spu_backing_runcntl_write,
392 .runcntl_stop = spu_backing_runcntl_stop,
393 .master_start = spu_backing_master_start,
394 .master_stop = spu_backing_master_stop,
395 .set_mfc_query = spu_backing_set_mfc_query,
396 .read_mfc_tagstatus = spu_backing_read_mfc_tagstatus,
397 .get_mfc_free_elements = spu_backing_get_mfc_free_elements,
398 .send_mfc_command = spu_backing_send_mfc_command,
399 .restart_dma = spu_backing_restart_dma,
400};
401

source code of linux/arch/powerpc/platforms/cell/spufs/backing_ops.c