2 * Copyright (C) 2012 Intel Corporation
4 * Copyright (C) 2018 Alexander Motin <mav@FreeBSD.org>
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
33 #include <sys/param.h>
34 #include <sys/systm.h>
37 #include <sys/domainset.h>
39 #include <sys/ioccom.h>
40 #include <sys/kernel.h>
43 #include <sys/malloc.h>
44 #include <sys/module.h>
45 #include <sys/mutex.h>
49 #include <sys/sysctl.h>
50 #include <sys/taskqueue.h>
52 #include <dev/pci/pcireg.h>
53 #include <dev/pci/pcivar.h>
54 #include <machine/bus.h>
55 #include <machine/resource.h>
56 #include <machine/stdarg.h>
64 #include "ioat_internal.h"
66 #ifndef BUS_SPACE_MAXADDR_40BIT
67 #define BUS_SPACE_MAXADDR_40BIT MIN(BUS_SPACE_MAXADDR, 0xFFFFFFFFFFULL)
69 #ifndef BUS_SPACE_MAXADDR_46BIT
70 #define BUS_SPACE_MAXADDR_46BIT MIN(BUS_SPACE_MAXADDR, 0x3FFFFFFFFFFFULL)
73 static int ioat_probe(device_t device);
74 static int ioat_attach(device_t device);
75 static int ioat_detach(device_t device);
76 static int ioat_setup_intr(struct ioat_softc *ioat);
77 static int ioat_teardown_intr(struct ioat_softc *ioat);
78 static int ioat3_attach(device_t device);
79 static int ioat_start_channel(struct ioat_softc *ioat);
80 static int ioat_map_pci_bar(struct ioat_softc *ioat);
81 static void ioat_dmamap_cb(void *arg, bus_dma_segment_t *segs, int nseg,
83 static void ioat_interrupt_handler(void *arg);
84 static boolean_t ioat_model_resets_msix(struct ioat_softc *ioat);
85 static int chanerr_to_errno(uint32_t);
86 static void ioat_process_events(struct ioat_softc *ioat, boolean_t intr);
87 static inline uint32_t ioat_get_active(struct ioat_softc *ioat);
88 static inline uint32_t ioat_get_ring_space(struct ioat_softc *ioat);
89 static void ioat_free_ring(struct ioat_softc *, uint32_t size,
90 struct ioat_descriptor *);
91 static int ioat_reserve_space(struct ioat_softc *, uint32_t, int mflags);
92 static union ioat_hw_descriptor *ioat_get_descriptor(struct ioat_softc *,
94 static struct ioat_descriptor *ioat_get_ring_entry(struct ioat_softc *,
96 static void ioat_halted_debug(struct ioat_softc *, uint32_t);
97 static void ioat_poll_timer_callback(void *arg);
98 static void dump_descriptor(void *hw_desc);
99 static void ioat_submit_single(struct ioat_softc *ioat);
100 static void ioat_comp_update_map(void *arg, bus_dma_segment_t *seg, int nseg,
102 static int ioat_reset_hw(struct ioat_softc *ioat);
103 static void ioat_reset_hw_task(void *, int);
104 static void ioat_setup_sysctl(device_t device);
105 static int sysctl_handle_reset(SYSCTL_HANDLER_ARGS);
106 static void ioat_get(struct ioat_softc *);
107 static void ioat_put(struct ioat_softc *);
108 static void ioat_drain_locked(struct ioat_softc *);
110 #define ioat_log_message(v, ...) do { \
111 if ((v) <= g_ioat_debug_level) { \
112 device_printf(ioat->device, __VA_ARGS__); \
116 MALLOC_DEFINE(M_IOAT, "ioat", "ioat driver memory allocations");
117 SYSCTL_NODE(_hw, OID_AUTO, ioat, CTLFLAG_RD, 0, "ioat node");
119 static int g_force_legacy_interrupts;
120 SYSCTL_INT(_hw_ioat, OID_AUTO, force_legacy_interrupts, CTLFLAG_RDTUN,
121 &g_force_legacy_interrupts, 0, "Set to non-zero to force MSI-X disabled");
123 int g_ioat_debug_level = 0;
124 SYSCTL_INT(_hw_ioat, OID_AUTO, debug_level, CTLFLAG_RWTUN, &g_ioat_debug_level,
125 0, "Set log level (0-3) for ioat(4). Higher is more verbose.");
127 unsigned g_ioat_ring_order = 13;
128 SYSCTL_UINT(_hw_ioat, OID_AUTO, ring_order, CTLFLAG_RDTUN, &g_ioat_ring_order,
129 0, "Set IOAT ring order. (1 << this) == ring size.");
132 * OS <-> Driver interface structures
134 static device_method_t ioat_pci_methods[] = {
135 /* Device interface */
136 DEVMETHOD(device_probe, ioat_probe),
137 DEVMETHOD(device_attach, ioat_attach),
138 DEVMETHOD(device_detach, ioat_detach),
142 static driver_t ioat_pci_driver = {
145 sizeof(struct ioat_softc),
148 static devclass_t ioat_devclass;
149 DRIVER_MODULE(ioat, pci, ioat_pci_driver, ioat_devclass, 0, 0);
150 MODULE_VERSION(ioat, 1);
153 * Private data structures
155 static struct ioat_softc *ioat_channel[IOAT_MAX_CHANNELS];
156 static unsigned ioat_channel_index = 0;
157 SYSCTL_UINT(_hw_ioat, OID_AUTO, channels, CTLFLAG_RD, &ioat_channel_index, 0,
158 "Number of IOAT channels attached");
159 static struct mtx ioat_list_mtx;
160 MTX_SYSINIT(ioat_list_mtx, &ioat_list_mtx, "ioat list mtx", MTX_DEF);
167 { 0x34308086, "TBG IOAT Ch0" },
168 { 0x34318086, "TBG IOAT Ch1" },
169 { 0x34328086, "TBG IOAT Ch2" },
170 { 0x34338086, "TBG IOAT Ch3" },
171 { 0x34298086, "TBG IOAT Ch4" },
172 { 0x342a8086, "TBG IOAT Ch5" },
173 { 0x342b8086, "TBG IOAT Ch6" },
174 { 0x342c8086, "TBG IOAT Ch7" },
176 { 0x37108086, "JSF IOAT Ch0" },
177 { 0x37118086, "JSF IOAT Ch1" },
178 { 0x37128086, "JSF IOAT Ch2" },
179 { 0x37138086, "JSF IOAT Ch3" },
180 { 0x37148086, "JSF IOAT Ch4" },
181 { 0x37158086, "JSF IOAT Ch5" },
182 { 0x37168086, "JSF IOAT Ch6" },
183 { 0x37178086, "JSF IOAT Ch7" },
184 { 0x37188086, "JSF IOAT Ch0 (RAID)" },
185 { 0x37198086, "JSF IOAT Ch1 (RAID)" },
187 { 0x3c208086, "SNB IOAT Ch0" },
188 { 0x3c218086, "SNB IOAT Ch1" },
189 { 0x3c228086, "SNB IOAT Ch2" },
190 { 0x3c238086, "SNB IOAT Ch3" },
191 { 0x3c248086, "SNB IOAT Ch4" },
192 { 0x3c258086, "SNB IOAT Ch5" },
193 { 0x3c268086, "SNB IOAT Ch6" },
194 { 0x3c278086, "SNB IOAT Ch7" },
195 { 0x3c2e8086, "SNB IOAT Ch0 (RAID)" },
196 { 0x3c2f8086, "SNB IOAT Ch1 (RAID)" },
198 { 0x0e208086, "IVB IOAT Ch0" },
199 { 0x0e218086, "IVB IOAT Ch1" },
200 { 0x0e228086, "IVB IOAT Ch2" },
201 { 0x0e238086, "IVB IOAT Ch3" },
202 { 0x0e248086, "IVB IOAT Ch4" },
203 { 0x0e258086, "IVB IOAT Ch5" },
204 { 0x0e268086, "IVB IOAT Ch6" },
205 { 0x0e278086, "IVB IOAT Ch7" },
206 { 0x0e2e8086, "IVB IOAT Ch0 (RAID)" },
207 { 0x0e2f8086, "IVB IOAT Ch1 (RAID)" },
209 { 0x2f208086, "HSW IOAT Ch0" },
210 { 0x2f218086, "HSW IOAT Ch1" },
211 { 0x2f228086, "HSW IOAT Ch2" },
212 { 0x2f238086, "HSW IOAT Ch3" },
213 { 0x2f248086, "HSW IOAT Ch4" },
214 { 0x2f258086, "HSW IOAT Ch5" },
215 { 0x2f268086, "HSW IOAT Ch6" },
216 { 0x2f278086, "HSW IOAT Ch7" },
217 { 0x2f2e8086, "HSW IOAT Ch0 (RAID)" },
218 { 0x2f2f8086, "HSW IOAT Ch1 (RAID)" },
220 { 0x0c508086, "BWD IOAT Ch0" },
221 { 0x0c518086, "BWD IOAT Ch1" },
222 { 0x0c528086, "BWD IOAT Ch2" },
223 { 0x0c538086, "BWD IOAT Ch3" },
225 { 0x6f508086, "BDXDE IOAT Ch0" },
226 { 0x6f518086, "BDXDE IOAT Ch1" },
227 { 0x6f528086, "BDXDE IOAT Ch2" },
228 { 0x6f538086, "BDXDE IOAT Ch3" },
230 { 0x6f208086, "BDX IOAT Ch0" },
231 { 0x6f218086, "BDX IOAT Ch1" },
232 { 0x6f228086, "BDX IOAT Ch2" },
233 { 0x6f238086, "BDX IOAT Ch3" },
234 { 0x6f248086, "BDX IOAT Ch4" },
235 { 0x6f258086, "BDX IOAT Ch5" },
236 { 0x6f268086, "BDX IOAT Ch6" },
237 { 0x6f278086, "BDX IOAT Ch7" },
238 { 0x6f2e8086, "BDX IOAT Ch0 (RAID)" },
239 { 0x6f2f8086, "BDX IOAT Ch1 (RAID)" },
241 { 0x20218086, "SKX IOAT" },
244 MODULE_PNP_INFO("W32:vendor/device;D:#", pci, ioat, pci_ids,
248 * OS <-> Driver linkage functions
251 ioat_probe(device_t device)
256 type = pci_get_devid(device);
257 for (ep = pci_ids; ep < &pci_ids[nitems(pci_ids)]; ep++) {
258 if (ep->type == type) {
259 device_set_desc(device, ep->desc);
267 ioat_attach(device_t device)
269 struct ioat_softc *ioat;
272 ioat = DEVICE2SOFTC(device);
273 ioat->device = device;
274 if (bus_get_domain(device, &ioat->domain) != 0)
276 ioat->cpu = CPU_FFS(&cpuset_domain[ioat->domain]) - 1;
278 ioat->cpu = CPU_FIRST();
280 error = ioat_map_pci_bar(ioat);
284 ioat->version = ioat_read_cbver(ioat);
285 if (ioat->version < IOAT_VER_3_0) {
290 error = ioat3_attach(device);
294 error = pci_enable_busmaster(device);
298 error = ioat_setup_intr(ioat);
302 error = ioat_reset_hw(ioat);
306 ioat_process_events(ioat, FALSE);
307 ioat_setup_sysctl(device);
309 mtx_lock(&ioat_list_mtx);
310 for (i = 0; i < IOAT_MAX_CHANNELS; i++) {
311 if (ioat_channel[i] == NULL)
314 if (i >= IOAT_MAX_CHANNELS) {
315 mtx_unlock(&ioat_list_mtx);
316 device_printf(device, "Too many I/OAT devices in system\n");
321 ioat_channel[i] = ioat;
322 if (i >= ioat_channel_index)
323 ioat_channel_index = i + 1;
324 mtx_unlock(&ioat_list_mtx);
335 ioat_bus_dmamap_destroy(struct ioat_softc *ioat, const char *func,
336 bus_dma_tag_t dmat, bus_dmamap_t map)
340 error = bus_dmamap_destroy(dmat, map);
343 "%s: bus_dmamap_destroy failed %d\n", func, error);
350 ioat_detach(device_t device)
352 struct ioat_softc *ioat;
355 ioat = DEVICE2SOFTC(device);
357 mtx_lock(&ioat_list_mtx);
358 ioat_channel[ioat->chan_idx] = NULL;
359 while (ioat_channel_index > 0 &&
360 ioat_channel[ioat_channel_index - 1] == NULL)
361 ioat_channel_index--;
362 mtx_unlock(&ioat_list_mtx);
365 taskqueue_drain(taskqueue_thread, &ioat->reset_task);
367 mtx_lock(&ioat->submit_lock);
368 ioat->quiescing = TRUE;
369 ioat->destroying = TRUE;
370 wakeup(&ioat->quiescing);
371 wakeup(&ioat->resetting);
373 ioat_drain_locked(ioat);
374 mtx_unlock(&ioat->submit_lock);
375 mtx_lock(&ioat->cleanup_lock);
376 while (ioat_get_active(ioat) > 0)
377 msleep(&ioat->tail, &ioat->cleanup_lock, 0, "ioat_drain", 1);
378 mtx_unlock(&ioat->cleanup_lock);
380 ioat_teardown_intr(ioat);
381 callout_drain(&ioat->poll_timer);
383 pci_disable_busmaster(device);
385 if (ioat->pci_resource != NULL)
386 bus_release_resource(device, SYS_RES_MEMORY,
387 ioat->pci_resource_id, ioat->pci_resource);
389 if (ioat->data_tag != NULL) {
390 for (i = 0; i < 1 << ioat->ring_size_order; i++) {
391 error = ioat_bus_dmamap_destroy(ioat, __func__,
392 ioat->data_tag, ioat->ring[i].src_dmamap);
396 for (i = 0; i < 1 << ioat->ring_size_order; i++) {
397 error = ioat_bus_dmamap_destroy(ioat, __func__,
398 ioat->data_tag, ioat->ring[i].dst_dmamap);
403 for (i = 0; i < 1 << ioat->ring_size_order; i++) {
404 error = ioat_bus_dmamap_destroy(ioat, __func__,
405 ioat->data_tag, ioat->ring[i].src2_dmamap);
409 for (i = 0; i < 1 << ioat->ring_size_order; i++) {
410 error = ioat_bus_dmamap_destroy(ioat, __func__,
411 ioat->data_tag, ioat->ring[i].dst2_dmamap);
416 bus_dma_tag_destroy(ioat->data_tag);
419 if (ioat->ring != NULL)
420 ioat_free_ring(ioat, 1 << ioat->ring_size_order, ioat->ring);
422 if (ioat->comp_update != NULL) {
423 bus_dmamap_unload(ioat->comp_update_tag, ioat->comp_update_map);
424 bus_dmamem_free(ioat->comp_update_tag, ioat->comp_update,
425 ioat->comp_update_map);
426 bus_dma_tag_destroy(ioat->comp_update_tag);
429 if (ioat->hw_desc_ring != NULL) {
430 bus_dmamap_unload(ioat->hw_desc_tag, ioat->hw_desc_map);
431 bus_dmamem_free(ioat->hw_desc_tag, ioat->hw_desc_ring,
433 bus_dma_tag_destroy(ioat->hw_desc_tag);
440 ioat_teardown_intr(struct ioat_softc *ioat)
443 if (ioat->tag != NULL)
444 bus_teardown_intr(ioat->device, ioat->res, ioat->tag);
446 if (ioat->res != NULL)
447 bus_release_resource(ioat->device, SYS_RES_IRQ,
448 rman_get_rid(ioat->res), ioat->res);
450 pci_release_msi(ioat->device);
455 ioat_start_channel(struct ioat_softc *ioat)
457 struct ioat_dma_hw_descriptor *hw_desc;
458 struct ioat_descriptor *desc;
459 struct bus_dmadesc *dmadesc;
464 ioat_acquire(&ioat->dmaengine);
466 /* Submit 'NULL' operation manually to avoid quiescing flag */
467 desc = ioat_get_ring_entry(ioat, ioat->head);
468 hw_desc = &ioat_get_descriptor(ioat, ioat->head)->dma;
469 dmadesc = &desc->bus_dmadesc;
471 dmadesc->callback_fn = NULL;
472 dmadesc->callback_arg = NULL;
474 hw_desc->u.control_raw = 0;
475 hw_desc->u.control_generic.op = IOAT_OP_COPY;
476 hw_desc->u.control_generic.completion_update = 1;
478 hw_desc->src_addr = 0;
479 hw_desc->dest_addr = 0;
480 hw_desc->u.control.null = 1;
482 ioat_submit_single(ioat);
483 ioat_release(&ioat->dmaengine);
485 for (i = 0; i < 100; i++) {
487 status = ioat_get_chansts(ioat);
488 if (is_ioat_idle(status))
492 chanerr = ioat_read_4(ioat, IOAT_CHANERR_OFFSET);
493 ioat_log_message(0, "could not start channel: "
494 "status = %#jx error = %b\n", (uintmax_t)status, (int)chanerr,
500 * Initialize Hardware
503 ioat3_attach(device_t device)
505 struct ioat_softc *ioat;
506 struct ioat_descriptor *ring;
507 struct ioat_dma_hw_descriptor *dma_hw_desc;
511 int i, num_descriptors;
516 ioat = DEVICE2SOFTC(device);
517 ioat->capabilities = ioat_read_dmacapability(ioat);
519 ioat_log_message(0, "Capabilities: %b\n", (int)ioat->capabilities,
522 xfercap = ioat_read_xfercap(ioat);
523 ioat->max_xfer_size = 1 << xfercap;
525 ioat->intrdelay_supported = (ioat_read_2(ioat, IOAT_INTRDELAY_OFFSET) &
526 IOAT_INTRDELAY_SUPPORTED) != 0;
527 if (ioat->intrdelay_supported)
528 ioat->intrdelay_max = IOAT_INTRDELAY_US_MASK;
530 /* TODO: need to check DCA here if we ever do XOR/PQ */
532 mtx_init(&ioat->submit_lock, "ioat_submit", NULL, MTX_DEF);
533 mtx_init(&ioat->cleanup_lock, "ioat_cleanup", NULL, MTX_DEF);
534 callout_init(&ioat->poll_timer, 1);
535 TASK_INIT(&ioat->reset_task, 0, ioat_reset_hw_task, ioat);
537 /* Establish lock order for Witness */
538 mtx_lock(&ioat->cleanup_lock);
539 mtx_lock(&ioat->submit_lock);
540 mtx_unlock(&ioat->submit_lock);
541 mtx_unlock(&ioat->cleanup_lock);
543 ioat->is_submitter_processing = FALSE;
545 if (ioat->version >= IOAT_VER_3_3)
546 lowaddr = BUS_SPACE_MAXADDR_48BIT;
547 else if (ioat->version >= IOAT_VER_3_2)
548 lowaddr = BUS_SPACE_MAXADDR_46BIT;
550 lowaddr = BUS_SPACE_MAXADDR_40BIT;
552 error = bus_dma_tag_create(bus_get_dma_tag(ioat->device),
553 sizeof(uint64_t), 0x0, lowaddr, BUS_SPACE_MAXADDR, NULL, NULL,
554 sizeof(uint64_t), 1, sizeof(uint64_t), 0, NULL, NULL,
555 &ioat->comp_update_tag);
559 error = bus_dmamem_alloc(ioat->comp_update_tag,
560 (void **)&ioat->comp_update, BUS_DMA_ZERO | BUS_DMA_WAITOK,
561 &ioat->comp_update_map);
565 error = bus_dmamap_load(ioat->comp_update_tag, ioat->comp_update_map,
566 ioat->comp_update, sizeof(uint64_t), ioat_comp_update_map, ioat,
571 ioat->ring_size_order = g_ioat_ring_order;
572 num_descriptors = 1 << ioat->ring_size_order;
573 ringsz = sizeof(struct ioat_dma_hw_descriptor) * num_descriptors;
575 error = bus_dma_tag_create(bus_get_dma_tag(ioat->device),
576 2 * 1024 * 1024, 0x0, lowaddr, BUS_SPACE_MAXADDR, NULL, NULL,
577 ringsz, 1, ringsz, 0, NULL, NULL, &ioat->hw_desc_tag);
581 error = bus_dmamem_alloc(ioat->hw_desc_tag, &hw_desc,
582 BUS_DMA_ZERO | BUS_DMA_WAITOK, &ioat->hw_desc_map);
586 error = bus_dmamap_load(ioat->hw_desc_tag, ioat->hw_desc_map, hw_desc,
587 ringsz, ioat_dmamap_cb, &ioat->hw_desc_bus_addr, BUS_DMA_NOWAIT);
591 ioat->hw_desc_ring = hw_desc;
593 error = bus_dma_tag_create(bus_get_dma_tag(ioat->device),
594 1, 0, lowaddr, BUS_SPACE_MAXADDR, NULL, NULL,
595 ioat->max_xfer_size, 1, ioat->max_xfer_size, 0, NULL, NULL,
599 ioat->ring = malloc_domainset(num_descriptors * sizeof(*ring), M_IOAT,
600 DOMAINSET_PREF(ioat->domain), M_ZERO | M_WAITOK);
603 for (i = 0; i < num_descriptors; i++) {
604 memset(&ring[i].bus_dmadesc, 0, sizeof(ring[i].bus_dmadesc));
606 error = bus_dmamap_create(ioat->data_tag, 0,
607 &ring[i].src_dmamap);
610 "%s: bus_dmamap_create failed %d\n", __func__,
614 error = bus_dmamap_create(ioat->data_tag, 0,
615 &ring[i].dst_dmamap);
618 "%s: bus_dmamap_create failed %d\n", __func__,
622 error = bus_dmamap_create(ioat->data_tag, 0,
623 &ring[i].src2_dmamap);
626 "%s: bus_dmamap_create failed %d\n", __func__,
630 error = bus_dmamap_create(ioat->data_tag, 0,
631 &ring[i].dst2_dmamap);
634 "%s: bus_dmamap_create failed %d\n", __func__,
640 for (i = 0; i < num_descriptors; i++) {
641 dma_hw_desc = &ioat->hw_desc_ring[i].dma;
642 dma_hw_desc->next = RING_PHYS_ADDR(ioat, i + 1);
645 ioat->tail = ioat->head = 0;
646 *ioat->comp_update = ioat->last_seen =
647 RING_PHYS_ADDR(ioat, ioat->tail - 1);
652 ioat_map_pci_bar(struct ioat_softc *ioat)
655 ioat->pci_resource_id = PCIR_BAR(0);
656 ioat->pci_resource = bus_alloc_resource_any(ioat->device,
657 SYS_RES_MEMORY, &ioat->pci_resource_id, RF_ACTIVE);
659 if (ioat->pci_resource == NULL) {
660 ioat_log_message(0, "unable to allocate pci resource\n");
664 ioat->pci_bus_tag = rman_get_bustag(ioat->pci_resource);
665 ioat->pci_bus_handle = rman_get_bushandle(ioat->pci_resource);
670 ioat_comp_update_map(void *arg, bus_dma_segment_t *seg, int nseg, int error)
672 struct ioat_softc *ioat = arg;
674 KASSERT(error == 0, ("%s: error:%d", __func__, error));
675 ioat->comp_update_bus_addr = seg[0].ds_addr;
679 ioat_dmamap_cb(void *arg, bus_dma_segment_t *segs, int nseg, int error)
683 KASSERT(error == 0, ("%s: error:%d", __func__, error));
685 *baddr = segs->ds_addr;
689 * Interrupt setup and handlers
692 ioat_setup_intr(struct ioat_softc *ioat)
694 uint32_t num_vectors;
697 boolean_t force_legacy_interrupts;
700 force_legacy_interrupts = FALSE;
702 if (!g_force_legacy_interrupts && pci_msix_count(ioat->device) >= 1) {
704 pci_alloc_msix(ioat->device, &num_vectors);
705 if (num_vectors == 1)
711 ioat->res = bus_alloc_resource_any(ioat->device, SYS_RES_IRQ,
712 &ioat->rid, RF_ACTIVE);
715 ioat->res = bus_alloc_resource_any(ioat->device, SYS_RES_IRQ,
716 &ioat->rid, RF_SHAREABLE | RF_ACTIVE);
718 if (ioat->res == NULL) {
719 ioat_log_message(0, "bus_alloc_resource failed\n");
724 error = bus_setup_intr(ioat->device, ioat->res, INTR_MPSAFE |
725 INTR_TYPE_MISC, NULL, ioat_interrupt_handler, ioat, &ioat->tag);
727 ioat_log_message(0, "bus_setup_intr failed\n");
731 ioat_write_intrctrl(ioat, IOAT_INTRCTRL_MASTER_INT_EN);
736 ioat_model_resets_msix(struct ioat_softc *ioat)
740 pciid = pci_get_devid(ioat->device);
759 ioat_interrupt_handler(void *arg)
761 struct ioat_softc *ioat = arg;
763 ioat->stats.interrupts++;
764 ioat_process_events(ioat, TRUE);
768 chanerr_to_errno(uint32_t chanerr)
773 if ((chanerr & (IOAT_CHANERR_XSADDERR | IOAT_CHANERR_XDADDERR)) != 0)
775 if ((chanerr & (IOAT_CHANERR_RDERR | IOAT_CHANERR_WDERR)) != 0)
777 /* This one is probably our fault: */
778 if ((chanerr & IOAT_CHANERR_NDADDERR) != 0)
784 ioat_process_events(struct ioat_softc *ioat, boolean_t intr)
786 struct ioat_descriptor *desc;
787 struct bus_dmadesc *dmadesc;
788 uint64_t comp_update, status;
789 uint32_t completed, chanerr;
792 mtx_lock(&ioat->cleanup_lock);
795 * Don't run while the hardware is being reset. Reset is responsible
796 * for blocking new work and draining & completing existing work, so
797 * there is nothing to do until new work is queued after reset anyway.
799 if (ioat->resetting_cleanup) {
800 mtx_unlock(&ioat->cleanup_lock);
805 comp_update = *ioat->comp_update;
806 status = comp_update & IOAT_CHANSTS_COMPLETED_DESCRIPTOR_MASK;
808 if (status < ioat->hw_desc_bus_addr ||
809 status >= ioat->hw_desc_bus_addr + (1 << ioat->ring_size_order) *
810 sizeof(struct ioat_generic_hw_descriptor))
811 panic("Bogus completion address %jx (channel %u)",
812 (uintmax_t)status, ioat->chan_idx);
814 if (status == ioat->last_seen) {
816 * If we landed in process_events and nothing has been
817 * completed, check for a timeout due to channel halt.
821 CTR4(KTR_IOAT, "%s channel=%u hw_status=0x%lx last_seen=0x%lx",
822 __func__, ioat->chan_idx, comp_update, ioat->last_seen);
824 while (RING_PHYS_ADDR(ioat, ioat->tail - 1) != status) {
825 desc = ioat_get_ring_entry(ioat, ioat->tail);
826 dmadesc = &desc->bus_dmadesc;
827 CTR5(KTR_IOAT, "channel=%u completing desc idx %u (%p) ok cb %p(%p)",
828 ioat->chan_idx, ioat->tail, dmadesc, dmadesc->callback_fn,
829 dmadesc->callback_arg);
831 bus_dmamap_unload(ioat->data_tag, desc->src_dmamap);
832 bus_dmamap_unload(ioat->data_tag, desc->dst_dmamap);
833 bus_dmamap_unload(ioat->data_tag, desc->src2_dmamap);
834 bus_dmamap_unload(ioat->data_tag, desc->dst2_dmamap);
836 if (dmadesc->callback_fn != NULL)
837 dmadesc->callback_fn(dmadesc->callback_arg, 0);
842 CTR5(KTR_IOAT, "%s channel=%u head=%u tail=%u active=%u", __func__,
843 ioat->chan_idx, ioat->head, ioat->tail, ioat_get_active(ioat));
845 if (completed != 0) {
846 ioat->last_seen = RING_PHYS_ADDR(ioat, ioat->tail - 1);
847 ioat->stats.descriptors_processed += completed;
852 ioat_write_chanctrl(ioat, IOAT_CHANCTRL_RUN);
853 mtx_unlock(&ioat->cleanup_lock);
856 * The device doesn't seem to reliably push suspend/halt statuses to
857 * the channel completion memory address, so poll the device register
858 * here. For performance reasons skip it on interrupts, do it only
859 * on much more rare polling events.
862 comp_update = ioat_get_chansts(ioat) & IOAT_CHANSTS_STATUS;
863 if (!is_ioat_halted(comp_update) && !is_ioat_suspended(comp_update))
866 ioat->stats.channel_halts++;
869 * Fatal programming error on this DMA channel. Flush any outstanding
870 * work with error status and restart the engine.
872 mtx_lock(&ioat->submit_lock);
873 ioat->quiescing = TRUE;
874 mtx_unlock(&ioat->submit_lock);
877 * This is safe to do here because the submit queue is quiesced. We
878 * know that we will drain all outstanding events, so ioat_reset_hw
879 * can't deadlock. It is necessary to protect other ioat_process_event
880 * threads from racing ioat_reset_hw, reading an indeterminate hw
881 * state, and attempting to continue issuing completions.
883 mtx_lock(&ioat->cleanup_lock);
884 ioat->resetting_cleanup = TRUE;
886 chanerr = ioat_read_4(ioat, IOAT_CHANERR_OFFSET);
887 if (1 <= g_ioat_debug_level)
888 ioat_halted_debug(ioat, chanerr);
889 ioat->stats.last_halt_chanerr = chanerr;
891 while (ioat_get_active(ioat) > 0) {
892 desc = ioat_get_ring_entry(ioat, ioat->tail);
893 dmadesc = &desc->bus_dmadesc;
894 CTR5(KTR_IOAT, "channel=%u completing desc idx %u (%p) err cb %p(%p)",
895 ioat->chan_idx, ioat->tail, dmadesc, dmadesc->callback_fn,
896 dmadesc->callback_arg);
898 if (dmadesc->callback_fn != NULL)
899 dmadesc->callback_fn(dmadesc->callback_arg,
900 chanerr_to_errno(chanerr));
903 ioat->stats.descriptors_processed++;
904 ioat->stats.descriptors_error++;
906 CTR5(KTR_IOAT, "%s channel=%u head=%u tail=%u active=%u", __func__,
907 ioat->chan_idx, ioat->head, ioat->tail, ioat_get_active(ioat));
909 /* Clear error status */
910 ioat_write_4(ioat, IOAT_CHANERR_OFFSET, chanerr);
912 mtx_unlock(&ioat->cleanup_lock);
914 ioat_log_message(0, "Resetting channel to recover from error\n");
915 error = taskqueue_enqueue(taskqueue_thread, &ioat->reset_task);
917 ("%s: taskqueue_enqueue failed: %d", __func__, error));
921 ioat_reset_hw_task(void *ctx, int pending __unused)
923 struct ioat_softc *ioat;
927 ioat_log_message(1, "%s: Resetting channel\n", __func__);
929 error = ioat_reset_hw(ioat);
930 KASSERT(error == 0, ("%s: reset failed: %d", __func__, error));
938 ioat_get_nchannels(void)
941 return (ioat_channel_index);
945 ioat_get_dmaengine(uint32_t index, int flags)
947 struct ioat_softc *ioat;
949 KASSERT((flags & ~(M_NOWAIT | M_WAITOK)) == 0,
950 ("invalid flags: 0x%08x", flags));
951 KASSERT((flags & (M_NOWAIT | M_WAITOK)) != (M_NOWAIT | M_WAITOK),
952 ("invalid wait | nowait"));
954 mtx_lock(&ioat_list_mtx);
955 if (index >= ioat_channel_index ||
956 (ioat = ioat_channel[index]) == NULL) {
957 mtx_unlock(&ioat_list_mtx);
960 mtx_lock(&ioat->submit_lock);
961 mtx_unlock(&ioat_list_mtx);
963 if (ioat->destroying) {
964 mtx_unlock(&ioat->submit_lock);
969 if (ioat->quiescing) {
970 if ((flags & M_NOWAIT) != 0) {
972 mtx_unlock(&ioat->submit_lock);
976 while (ioat->quiescing && !ioat->destroying)
977 msleep(&ioat->quiescing, &ioat->submit_lock, 0, "getdma", 0);
979 if (ioat->destroying) {
981 mtx_unlock(&ioat->submit_lock);
985 mtx_unlock(&ioat->submit_lock);
986 return (&ioat->dmaengine);
990 ioat_put_dmaengine(bus_dmaengine_t dmaengine)
992 struct ioat_softc *ioat;
994 ioat = to_ioat_softc(dmaengine);
995 mtx_lock(&ioat->submit_lock);
997 mtx_unlock(&ioat->submit_lock);
1001 ioat_get_hwversion(bus_dmaengine_t dmaengine)
1003 struct ioat_softc *ioat;
1005 ioat = to_ioat_softc(dmaengine);
1006 return (ioat->version);
1010 ioat_get_max_io_size(bus_dmaengine_t dmaengine)
1012 struct ioat_softc *ioat;
1014 ioat = to_ioat_softc(dmaengine);
1015 return (ioat->max_xfer_size);
1019 ioat_get_capabilities(bus_dmaengine_t dmaengine)
1021 struct ioat_softc *ioat;
1023 ioat = to_ioat_softc(dmaengine);
1024 return (ioat->capabilities);
1028 ioat_set_interrupt_coalesce(bus_dmaengine_t dmaengine, uint16_t delay)
1030 struct ioat_softc *ioat;
1032 ioat = to_ioat_softc(dmaengine);
1033 if (!ioat->intrdelay_supported)
1035 if (delay > ioat->intrdelay_max)
1038 ioat_write_2(ioat, IOAT_INTRDELAY_OFFSET, delay);
1039 ioat->cached_intrdelay =
1040 ioat_read_2(ioat, IOAT_INTRDELAY_OFFSET) & IOAT_INTRDELAY_US_MASK;
1045 ioat_get_max_coalesce_period(bus_dmaengine_t dmaengine)
1047 struct ioat_softc *ioat;
1049 ioat = to_ioat_softc(dmaengine);
1050 return (ioat->intrdelay_max);
1054 ioat_acquire(bus_dmaengine_t dmaengine)
1056 struct ioat_softc *ioat;
1058 ioat = to_ioat_softc(dmaengine);
1059 mtx_lock(&ioat->submit_lock);
1060 CTR2(KTR_IOAT, "%s channel=%u", __func__, ioat->chan_idx);
1061 ioat->acq_head = ioat->head;
1065 ioat_acquire_reserve(bus_dmaengine_t dmaengine, unsigned n, int mflags)
1067 struct ioat_softc *ioat;
1070 ioat = to_ioat_softc(dmaengine);
1071 ioat_acquire(dmaengine);
1073 error = ioat_reserve_space(ioat, n, mflags);
1075 ioat_release(dmaengine);
1080 ioat_release(bus_dmaengine_t dmaengine)
1082 struct ioat_softc *ioat;
1084 ioat = to_ioat_softc(dmaengine);
1085 CTR3(KTR_IOAT, "%s channel=%u dispatch1 head=%u", __func__,
1086 ioat->chan_idx, ioat->head);
1087 KFAIL_POINT_CODE(DEBUG_FP, ioat_release, /* do nothing */);
1088 CTR3(KTR_IOAT, "%s channel=%u dispatch2 head=%u", __func__,
1089 ioat->chan_idx, ioat->head);
1091 if (ioat->acq_head != ioat->head) {
1092 ioat_write_2(ioat, IOAT_DMACOUNT_OFFSET,
1093 (uint16_t)ioat->head);
1095 if (!callout_pending(&ioat->poll_timer)) {
1096 callout_reset_on(&ioat->poll_timer, 1,
1097 ioat_poll_timer_callback, ioat, ioat->cpu);
1100 mtx_unlock(&ioat->submit_lock);
1103 static struct ioat_descriptor *
1104 ioat_op_generic(struct ioat_softc *ioat, uint8_t op,
1105 uint32_t size, uint64_t src, uint64_t dst,
1106 bus_dmaengine_callback_t callback_fn, void *callback_arg,
1109 struct ioat_generic_hw_descriptor *hw_desc;
1110 struct ioat_descriptor *desc;
1111 bus_dma_segment_t seg;
1112 int mflags, nseg, error;
1114 mtx_assert(&ioat->submit_lock, MA_OWNED);
1116 KASSERT((flags & ~_DMA_GENERIC_FLAGS) == 0,
1117 ("Unrecognized flag(s): %#x", flags & ~_DMA_GENERIC_FLAGS));
1118 KASSERT(size <= ioat->max_xfer_size, ("%s: size too big (%u > %u)",
1119 __func__, (unsigned)size, ioat->max_xfer_size));
1121 if ((flags & DMA_NO_WAIT) != 0)
1126 if (ioat_reserve_space(ioat, 1, mflags) != 0)
1129 desc = ioat_get_ring_entry(ioat, ioat->head);
1130 hw_desc = &ioat_get_descriptor(ioat, ioat->head)->generic;
1132 hw_desc->u.control_raw = 0;
1133 hw_desc->u.control_generic.op = op;
1134 hw_desc->u.control_generic.completion_update = 1;
1136 if ((flags & DMA_INT_EN) != 0)
1137 hw_desc->u.control_generic.int_enable = 1;
1138 if ((flags & DMA_FENCE) != 0)
1139 hw_desc->u.control_generic.fence = 1;
1141 hw_desc->size = size;
1145 error = _bus_dmamap_load_phys(ioat->data_tag, desc->src_dmamap,
1146 src, size, 0, &seg, &nseg);
1148 ioat_log_message(0, "%s: _bus_dmamap_load_phys"
1149 " failed %d\n", __func__, error);
1152 hw_desc->src_addr = seg.ds_addr;
1157 error = _bus_dmamap_load_phys(ioat->data_tag, desc->dst_dmamap,
1158 dst, size, 0, &seg, &nseg);
1160 ioat_log_message(0, "%s: _bus_dmamap_load_phys"
1161 " failed %d\n", __func__, error);
1164 hw_desc->dest_addr = seg.ds_addr;
1167 desc->bus_dmadesc.callback_fn = callback_fn;
1168 desc->bus_dmadesc.callback_arg = callback_arg;
1172 struct bus_dmadesc *
1173 ioat_null(bus_dmaengine_t dmaengine, bus_dmaengine_callback_t callback_fn,
1174 void *callback_arg, uint32_t flags)
1176 struct ioat_dma_hw_descriptor *hw_desc;
1177 struct ioat_descriptor *desc;
1178 struct ioat_softc *ioat;
1180 ioat = to_ioat_softc(dmaengine);
1181 CTR2(KTR_IOAT, "%s channel=%u", __func__, ioat->chan_idx);
1183 desc = ioat_op_generic(ioat, IOAT_OP_COPY, 8, 0, 0, callback_fn,
1184 callback_arg, flags);
1188 hw_desc = &ioat_get_descriptor(ioat, desc->id)->dma;
1189 hw_desc->u.control.null = 1;
1190 ioat_submit_single(ioat);
1191 return (&desc->bus_dmadesc);
1194 struct bus_dmadesc *
1195 ioat_copy(bus_dmaengine_t dmaengine, bus_addr_t dst,
1196 bus_addr_t src, bus_size_t len, bus_dmaengine_callback_t callback_fn,
1197 void *callback_arg, uint32_t flags)
1199 struct ioat_dma_hw_descriptor *hw_desc;
1200 struct ioat_descriptor *desc;
1201 struct ioat_softc *ioat;
1203 ioat = to_ioat_softc(dmaengine);
1204 desc = ioat_op_generic(ioat, IOAT_OP_COPY, len, src, dst, callback_fn,
1205 callback_arg, flags);
1209 hw_desc = &ioat_get_descriptor(ioat, desc->id)->dma;
1210 if (g_ioat_debug_level >= 3)
1211 dump_descriptor(hw_desc);
1213 ioat_submit_single(ioat);
1214 CTR6(KTR_IOAT, "%s channel=%u desc=%p dest=%lx src=%lx len=%lx",
1215 __func__, ioat->chan_idx, &desc->bus_dmadesc, dst, src, len);
1216 return (&desc->bus_dmadesc);
1219 struct bus_dmadesc *
1220 ioat_copy_8k_aligned(bus_dmaengine_t dmaengine, bus_addr_t dst1,
1221 bus_addr_t dst2, bus_addr_t src1, bus_addr_t src2,
1222 bus_dmaengine_callback_t callback_fn, void *callback_arg, uint32_t flags)
1224 struct ioat_dma_hw_descriptor *hw_desc;
1225 struct ioat_descriptor *desc;
1226 struct ioat_softc *ioat;
1227 bus_size_t src1_len, dst1_len;
1228 bus_dma_segment_t seg;
1231 ioat = to_ioat_softc(dmaengine);
1232 CTR2(KTR_IOAT, "%s channel=%u", __func__, ioat->chan_idx);
1234 KASSERT(((src1 | src2 | dst1 | dst2) & PAGE_MASK) == 0,
1235 ("%s: addresses are not page-aligned", __func__));
1237 desc = ioat_op_generic(ioat, IOAT_OP_COPY, 2 * PAGE_SIZE, 0, 0,
1238 callback_fn, callback_arg, flags);
1242 hw_desc = &ioat_get_descriptor(ioat, desc->id)->dma;
1244 src1_len = (src2 != src1 + PAGE_SIZE) ? PAGE_SIZE : 2 * PAGE_SIZE;
1246 error = _bus_dmamap_load_phys(ioat->data_tag,
1247 desc->src_dmamap, src1, src1_len, 0, &seg, &nseg);
1249 ioat_log_message(0, "%s: _bus_dmamap_load_phys"
1250 " failed %d\n", __func__, error);
1253 hw_desc->src_addr = seg.ds_addr;
1254 if (src1_len != 2 * PAGE_SIZE) {
1255 hw_desc->u.control.src_page_break = 1;
1257 error = _bus_dmamap_load_phys(ioat->data_tag,
1258 desc->src2_dmamap, src2, PAGE_SIZE, 0, &seg, &nseg);
1260 ioat_log_message(0, "%s: _bus_dmamap_load_phys"
1261 " failed %d\n", __func__, error);
1264 hw_desc->next_src_addr = seg.ds_addr;
1267 dst1_len = (dst2 != dst1 + PAGE_SIZE) ? PAGE_SIZE : 2 * PAGE_SIZE;
1269 error = _bus_dmamap_load_phys(ioat->data_tag,
1270 desc->dst_dmamap, dst1, dst1_len, 0, &seg, &nseg);
1272 ioat_log_message(0, "%s: _bus_dmamap_load_phys"
1273 " failed %d\n", __func__, error);
1276 hw_desc->dest_addr = seg.ds_addr;
1277 if (dst1_len != 2 * PAGE_SIZE) {
1278 hw_desc->u.control.dest_page_break = 1;
1280 error = _bus_dmamap_load_phys(ioat->data_tag,
1281 desc->dst2_dmamap, dst2, PAGE_SIZE, 0, &seg, &nseg);
1283 ioat_log_message(0, "%s: _bus_dmamap_load_phys"
1284 " failed %d\n", __func__, error);
1287 hw_desc->next_dest_addr = seg.ds_addr;
1290 if (g_ioat_debug_level >= 3)
1291 dump_descriptor(hw_desc);
1293 ioat_submit_single(ioat);
1294 return (&desc->bus_dmadesc);
1297 struct bus_dmadesc *
1298 ioat_copy_crc(bus_dmaengine_t dmaengine, bus_addr_t dst, bus_addr_t src,
1299 bus_size_t len, uint32_t *initialseed, bus_addr_t crcptr,
1300 bus_dmaengine_callback_t callback_fn, void *callback_arg, uint32_t flags)
1302 struct ioat_crc32_hw_descriptor *hw_desc;
1303 struct ioat_descriptor *desc;
1304 struct ioat_softc *ioat;
1307 bus_dma_segment_t seg;
1310 ioat = to_ioat_softc(dmaengine);
1311 CTR2(KTR_IOAT, "%s channel=%u", __func__, ioat->chan_idx);
1313 KASSERT((ioat->capabilities & IOAT_DMACAP_MOVECRC) != 0,
1314 ("%s: device lacks MOVECRC capability", __func__));
1315 teststore = (flags & _DMA_CRC_TESTSTORE);
1316 KASSERT(teststore != _DMA_CRC_TESTSTORE,
1317 ("%s: TEST and STORE invalid", __func__));
1318 KASSERT(teststore != 0 || (flags & DMA_CRC_INLINE) == 0,
1319 ("%s: INLINE invalid without TEST or STORE", __func__));
1321 switch (teststore) {
1323 op = IOAT_OP_MOVECRC_STORE;
1326 op = IOAT_OP_MOVECRC_TEST;
1329 KASSERT(teststore == 0, ("bogus"));
1330 op = IOAT_OP_MOVECRC;
1334 desc = ioat_op_generic(ioat, op, len, src, dst, callback_fn,
1335 callback_arg, flags & ~_DMA_CRC_FLAGS);
1339 hw_desc = &ioat_get_descriptor(ioat, desc->id)->crc32;
1341 if ((flags & DMA_CRC_INLINE) == 0) {
1343 error = _bus_dmamap_load_phys(ioat->data_tag,
1344 desc->dst2_dmamap, crcptr, sizeof(uint32_t), 0,
1347 ioat_log_message(0, "%s: _bus_dmamap_load_phys"
1348 " failed %d\n", __func__, error);
1351 hw_desc->crc_address = seg.ds_addr;
1353 hw_desc->u.control.crc_location = 1;
1355 if (initialseed != NULL) {
1356 hw_desc->u.control.use_seed = 1;
1357 hw_desc->seed = *initialseed;
1360 if (g_ioat_debug_level >= 3)
1361 dump_descriptor(hw_desc);
1363 ioat_submit_single(ioat);
1364 return (&desc->bus_dmadesc);
1367 struct bus_dmadesc *
1368 ioat_crc(bus_dmaengine_t dmaengine, bus_addr_t src, bus_size_t len,
1369 uint32_t *initialseed, bus_addr_t crcptr,
1370 bus_dmaengine_callback_t callback_fn, void *callback_arg, uint32_t flags)
1372 struct ioat_crc32_hw_descriptor *hw_desc;
1373 struct ioat_descriptor *desc;
1374 struct ioat_softc *ioat;
1377 bus_dma_segment_t seg;
1380 ioat = to_ioat_softc(dmaengine);
1381 CTR2(KTR_IOAT, "%s channel=%u", __func__, ioat->chan_idx);
1383 KASSERT((ioat->capabilities & IOAT_DMACAP_CRC) != 0,
1384 ("%s: device lacks CRC capability", __func__));
1385 teststore = (flags & _DMA_CRC_TESTSTORE);
1386 KASSERT(teststore != _DMA_CRC_TESTSTORE,
1387 ("%s: TEST and STORE invalid", __func__));
1388 KASSERT(teststore != 0 || (flags & DMA_CRC_INLINE) == 0,
1389 ("%s: INLINE invalid without TEST or STORE", __func__));
1391 switch (teststore) {
1393 op = IOAT_OP_CRC_STORE;
1396 op = IOAT_OP_CRC_TEST;
1399 KASSERT(teststore == 0, ("bogus"));
1404 desc = ioat_op_generic(ioat, op, len, src, 0, callback_fn,
1405 callback_arg, flags & ~_DMA_CRC_FLAGS);
1409 hw_desc = &ioat_get_descriptor(ioat, desc->id)->crc32;
1411 if ((flags & DMA_CRC_INLINE) == 0) {
1413 error = _bus_dmamap_load_phys(ioat->data_tag,
1414 desc->dst2_dmamap, crcptr, sizeof(uint32_t), 0,
1417 ioat_log_message(0, "%s: _bus_dmamap_load_phys"
1418 " failed %d\n", __func__, error);
1421 hw_desc->crc_address = seg.ds_addr;
1423 hw_desc->u.control.crc_location = 1;
1425 if (initialseed != NULL) {
1426 hw_desc->u.control.use_seed = 1;
1427 hw_desc->seed = *initialseed;
1430 if (g_ioat_debug_level >= 3)
1431 dump_descriptor(hw_desc);
1433 ioat_submit_single(ioat);
1434 return (&desc->bus_dmadesc);
1437 struct bus_dmadesc *
1438 ioat_blockfill(bus_dmaengine_t dmaengine, bus_addr_t dst, uint64_t fillpattern,
1439 bus_size_t len, bus_dmaengine_callback_t callback_fn, void *callback_arg,
1442 struct ioat_fill_hw_descriptor *hw_desc;
1443 struct ioat_descriptor *desc;
1444 struct ioat_softc *ioat;
1446 ioat = to_ioat_softc(dmaengine);
1447 CTR2(KTR_IOAT, "%s channel=%u", __func__, ioat->chan_idx);
1449 KASSERT((ioat->capabilities & IOAT_DMACAP_BFILL) != 0,
1450 ("%s: device lacks BFILL capability", __func__));
1452 desc = ioat_op_generic(ioat, IOAT_OP_FILL, len, 0, dst,
1453 callback_fn, callback_arg, flags);
1457 hw_desc = &ioat_get_descriptor(ioat, desc->id)->fill;
1458 hw_desc->src_data = fillpattern;
1459 if (g_ioat_debug_level >= 3)
1460 dump_descriptor(hw_desc);
1462 ioat_submit_single(ioat);
1463 return (&desc->bus_dmadesc);
1469 static inline uint32_t
1470 ioat_get_active(struct ioat_softc *ioat)
1473 return ((ioat->head - ioat->tail) & ((1 << ioat->ring_size_order) - 1));
1476 static inline uint32_t
1477 ioat_get_ring_space(struct ioat_softc *ioat)
1480 return ((1 << ioat->ring_size_order) - ioat_get_active(ioat) - 1);
1484 * Reserves space in this IOAT descriptor ring by ensuring enough slots remain
1487 * If mflags contains M_WAITOK, blocks until enough space is available.
1489 * Returns zero on success, or an errno on error. If num_descs is beyond the
1490 * maximum ring size, returns EINVAl; if allocation would block and mflags
1491 * contains M_NOWAIT, returns EAGAIN.
1493 * Must be called with the submit_lock held; returns with the lock held. The
1494 * lock may be dropped to allocate the ring.
1496 * (The submit_lock is needed to add any entries to the ring, so callers are
1497 * assured enough room is available.)
1500 ioat_reserve_space(struct ioat_softc *ioat, uint32_t num_descs, int mflags)
1505 mtx_assert(&ioat->submit_lock, MA_OWNED);
1509 if (num_descs < 1 || num_descs >= (1 << ioat->ring_size_order)) {
1515 if (ioat->quiescing) {
1520 if (ioat_get_ring_space(ioat) >= num_descs)
1523 CTR3(KTR_IOAT, "%s channel=%u starved (%u)", __func__,
1524 ioat->chan_idx, num_descs);
1526 if (!dug && !ioat->is_submitter_processing) {
1527 ioat->is_submitter_processing = TRUE;
1528 mtx_unlock(&ioat->submit_lock);
1530 CTR2(KTR_IOAT, "%s channel=%u attempting to process events",
1531 __func__, ioat->chan_idx);
1532 ioat_process_events(ioat, FALSE);
1534 mtx_lock(&ioat->submit_lock);
1536 KASSERT(ioat->is_submitter_processing == TRUE,
1537 ("is_submitter_processing"));
1538 ioat->is_submitter_processing = FALSE;
1539 wakeup(&ioat->tail);
1543 if ((mflags & M_WAITOK) == 0) {
1547 CTR2(KTR_IOAT, "%s channel=%u blocking on completions",
1548 __func__, ioat->chan_idx);
1549 msleep(&ioat->tail, &ioat->submit_lock, 0,
1555 mtx_assert(&ioat->submit_lock, MA_OWNED);
1556 KASSERT(!ioat->quiescing || error == ENXIO,
1557 ("reserved during quiesce"));
1562 ioat_free_ring(struct ioat_softc *ioat, uint32_t size,
1563 struct ioat_descriptor *ring)
1566 free_domain(ring, M_IOAT);
1569 static struct ioat_descriptor *
1570 ioat_get_ring_entry(struct ioat_softc *ioat, uint32_t index)
1573 return (&ioat->ring[index % (1 << ioat->ring_size_order)]);
1576 static union ioat_hw_descriptor *
1577 ioat_get_descriptor(struct ioat_softc *ioat, uint32_t index)
1580 return (&ioat->hw_desc_ring[index % (1 << ioat->ring_size_order)]);
1584 ioat_halted_debug(struct ioat_softc *ioat, uint32_t chanerr)
1586 union ioat_hw_descriptor *desc;
1588 ioat_log_message(0, "Channel halted (%b)\n", (int)chanerr,
1593 mtx_assert(&ioat->cleanup_lock, MA_OWNED);
1595 desc = ioat_get_descriptor(ioat, ioat->tail + 0);
1596 dump_descriptor(desc);
1598 desc = ioat_get_descriptor(ioat, ioat->tail + 1);
1599 dump_descriptor(desc);
1603 ioat_poll_timer_callback(void *arg)
1605 struct ioat_softc *ioat;
1608 CTR1(KTR_IOAT, "%s", __func__);
1610 ioat_process_events(ioat, FALSE);
1612 mtx_lock(&ioat->submit_lock);
1613 if (ioat_get_active(ioat) > 0)
1614 callout_schedule(&ioat->poll_timer, 1);
1615 mtx_unlock(&ioat->submit_lock);
1622 ioat_submit_single(struct ioat_softc *ioat)
1625 mtx_assert(&ioat->submit_lock, MA_OWNED);
1628 CTR4(KTR_IOAT, "%s channel=%u head=%u tail=%u", __func__,
1629 ioat->chan_idx, ioat->head, ioat->tail);
1631 ioat->stats.descriptors_submitted++;
1635 ioat_reset_hw(struct ioat_softc *ioat)
1642 CTR2(KTR_IOAT, "%s channel=%u", __func__, ioat->chan_idx);
1644 mtx_lock(&ioat->submit_lock);
1645 while (ioat->resetting && !ioat->destroying)
1646 msleep(&ioat->resetting, &ioat->submit_lock, 0, "IRH_drain", 0);
1647 if (ioat->destroying) {
1648 mtx_unlock(&ioat->submit_lock);
1651 ioat->resetting = TRUE;
1652 ioat->quiescing = TRUE;
1653 mtx_unlock(&ioat->submit_lock);
1654 mtx_lock(&ioat->cleanup_lock);
1655 while (ioat_get_active(ioat) > 0)
1656 msleep(&ioat->tail, &ioat->cleanup_lock, 0, "ioat_drain", 1);
1659 * Suspend ioat_process_events while the hardware and softc are in an
1660 * indeterminate state.
1662 ioat->resetting_cleanup = TRUE;
1663 mtx_unlock(&ioat->cleanup_lock);
1665 CTR2(KTR_IOAT, "%s channel=%u quiesced and drained", __func__,
1668 status = ioat_get_chansts(ioat);
1669 if (is_ioat_active(status) || is_ioat_idle(status))
1672 /* Wait at most 20 ms */
1673 for (timeout = 0; (is_ioat_active(status) || is_ioat_idle(status)) &&
1674 timeout < 20; timeout++) {
1676 status = ioat_get_chansts(ioat);
1678 if (timeout == 20) {
1683 KASSERT(ioat_get_active(ioat) == 0, ("active after quiesce"));
1685 chanerr = ioat_read_4(ioat, IOAT_CHANERR_OFFSET);
1686 ioat_write_4(ioat, IOAT_CHANERR_OFFSET, chanerr);
1688 CTR2(KTR_IOAT, "%s channel=%u hardware suspended", __func__,
1692 * IOAT v3 workaround - CHANERRMSK_INT with 3E07h to masks out errors
1693 * that can cause stability issues for IOAT v3.
1695 pci_write_config(ioat->device, IOAT_CFG_CHANERRMASK_INT_OFFSET, 0x3e07,
1697 chanerr = pci_read_config(ioat->device, IOAT_CFG_CHANERR_INT_OFFSET, 4);
1698 pci_write_config(ioat->device, IOAT_CFG_CHANERR_INT_OFFSET, chanerr, 4);
1701 * BDXDE and BWD models reset MSI-X registers on device reset.
1702 * Save/restore their contents manually.
1704 if (ioat_model_resets_msix(ioat)) {
1705 ioat_log_message(1, "device resets MSI-X registers; saving\n");
1706 pci_save_state(ioat->device);
1710 CTR2(KTR_IOAT, "%s channel=%u hardware reset", __func__,
1713 /* Wait at most 20 ms */
1714 for (timeout = 0; ioat_reset_pending(ioat) && timeout < 20; timeout++)
1716 if (timeout == 20) {
1721 if (ioat_model_resets_msix(ioat)) {
1722 ioat_log_message(1, "device resets registers; restored\n");
1723 pci_restore_state(ioat->device);
1726 /* Reset attempts to return the hardware to "halted." */
1727 status = ioat_get_chansts(ioat);
1728 if (is_ioat_active(status) || is_ioat_idle(status)) {
1729 /* So this really shouldn't happen... */
1730 ioat_log_message(0, "Device is active after a reset?\n");
1731 ioat_write_chanctrl(ioat, IOAT_CHANCTRL_RUN);
1736 chanerr = ioat_read_4(ioat, IOAT_CHANERR_OFFSET);
1738 mtx_lock(&ioat->cleanup_lock);
1739 ioat_halted_debug(ioat, chanerr);
1740 mtx_unlock(&ioat->cleanup_lock);
1746 * Bring device back online after reset. Writing CHAINADDR brings the
1747 * device back to active.
1749 * The internal ring counter resets to zero, so we have to start over
1752 ioat->tail = ioat->head = 0;
1753 *ioat->comp_update = ioat->last_seen =
1754 RING_PHYS_ADDR(ioat, ioat->tail - 1);
1756 ioat_write_chanctrl(ioat, IOAT_CHANCTRL_RUN);
1757 ioat_write_chancmp(ioat, ioat->comp_update_bus_addr);
1758 ioat_write_chainaddr(ioat, RING_PHYS_ADDR(ioat, 0));
1760 CTR2(KTR_IOAT, "%s channel=%u configured channel", __func__,
1764 /* Enqueues a null operation and ensures it completes. */
1766 error = ioat_start_channel(ioat);
1767 CTR2(KTR_IOAT, "%s channel=%u started channel", __func__,
1772 * Resume completions now that ring state is consistent.
1774 mtx_lock(&ioat->cleanup_lock);
1775 ioat->resetting_cleanup = FALSE;
1776 mtx_unlock(&ioat->cleanup_lock);
1778 /* Unblock submission of new work */
1779 mtx_lock(&ioat->submit_lock);
1780 ioat->quiescing = FALSE;
1781 wakeup(&ioat->quiescing);
1783 ioat->resetting = FALSE;
1784 wakeup(&ioat->resetting);
1786 CTR2(KTR_IOAT, "%s channel=%u reset done", __func__, ioat->chan_idx);
1787 mtx_unlock(&ioat->submit_lock);
1793 sysctl_handle_chansts(SYSCTL_HANDLER_ARGS)
1795 struct ioat_softc *ioat;
1802 status = ioat_get_chansts(ioat) & IOAT_CHANSTS_STATUS;
1804 sbuf_new_for_sysctl(&sb, NULL, 256, req);
1806 case IOAT_CHANSTS_ACTIVE:
1807 sbuf_printf(&sb, "ACTIVE");
1809 case IOAT_CHANSTS_IDLE:
1810 sbuf_printf(&sb, "IDLE");
1812 case IOAT_CHANSTS_SUSPENDED:
1813 sbuf_printf(&sb, "SUSPENDED");
1815 case IOAT_CHANSTS_HALTED:
1816 sbuf_printf(&sb, "HALTED");
1818 case IOAT_CHANSTS_ARMED:
1819 sbuf_printf(&sb, "ARMED");
1822 sbuf_printf(&sb, "UNKNOWN");
1825 error = sbuf_finish(&sb);
1828 if (error != 0 || req->newptr == NULL)
1834 sysctl_handle_dpi(SYSCTL_HANDLER_ARGS)
1836 struct ioat_softc *ioat;
1838 #define PRECISION "1"
1839 const uintmax_t factor = 10;
1844 sbuf_new_for_sysctl(&sb, NULL, 16, req);
1846 if (ioat->stats.interrupts == 0) {
1847 sbuf_printf(&sb, "NaN");
1850 rate = ioat->stats.descriptors_processed * factor /
1851 ioat->stats.interrupts;
1852 sbuf_printf(&sb, "%ju.%." PRECISION "ju", rate / factor,
1856 error = sbuf_finish(&sb);
1858 if (error != 0 || req->newptr == NULL)
1864 sysctl_handle_reset(SYSCTL_HANDLER_ARGS)
1866 struct ioat_softc *ioat;
1872 error = SYSCTL_OUT(req, &arg, sizeof(arg));
1873 if (error != 0 || req->newptr == NULL)
1876 error = SYSCTL_IN(req, &arg, sizeof(arg));
1881 error = ioat_reset_hw(ioat);
1887 dump_descriptor(void *hw_desc)
1891 for (i = 0; i < 2; i++) {
1892 for (j = 0; j < 8; j++)
1893 printf("%08x ", ((uint32_t *)hw_desc)[i * 8 + j]);
1899 ioat_setup_sysctl(device_t device)
1901 struct sysctl_oid_list *par, *statpar, *state, *hammer;
1902 struct sysctl_ctx_list *ctx;
1903 struct sysctl_oid *tree, *tmp;
1904 struct ioat_softc *ioat;
1906 ioat = DEVICE2SOFTC(device);
1907 ctx = device_get_sysctl_ctx(device);
1908 tree = device_get_sysctl_tree(device);
1909 par = SYSCTL_CHILDREN(tree);
1911 SYSCTL_ADD_INT(ctx, par, OID_AUTO, "version", CTLFLAG_RD,
1912 &ioat->version, 0, "HW version (0xMM form)");
1913 SYSCTL_ADD_UINT(ctx, par, OID_AUTO, "max_xfer_size", CTLFLAG_RD,
1914 &ioat->max_xfer_size, 0, "HW maximum transfer size");
1915 SYSCTL_ADD_INT(ctx, par, OID_AUTO, "intrdelay_supported", CTLFLAG_RD,
1916 &ioat->intrdelay_supported, 0, "Is INTRDELAY supported");
1917 SYSCTL_ADD_U16(ctx, par, OID_AUTO, "intrdelay_max", CTLFLAG_RD,
1918 &ioat->intrdelay_max, 0,
1919 "Maximum configurable INTRDELAY on this channel (microseconds)");
1921 tmp = SYSCTL_ADD_NODE(ctx, par, OID_AUTO, "state", CTLFLAG_RD, NULL,
1922 "IOAT channel internal state");
1923 state = SYSCTL_CHILDREN(tmp);
1925 SYSCTL_ADD_UINT(ctx, state, OID_AUTO, "ring_size_order", CTLFLAG_RD,
1926 &ioat->ring_size_order, 0, "SW descriptor ring size order");
1927 SYSCTL_ADD_UINT(ctx, state, OID_AUTO, "head", CTLFLAG_RD, &ioat->head,
1928 0, "SW descriptor head pointer index");
1929 SYSCTL_ADD_UINT(ctx, state, OID_AUTO, "tail", CTLFLAG_RD, &ioat->tail,
1930 0, "SW descriptor tail pointer index");
1932 SYSCTL_ADD_UQUAD(ctx, state, OID_AUTO, "last_completion", CTLFLAG_RD,
1933 ioat->comp_update, "HW addr of last completion");
1935 SYSCTL_ADD_INT(ctx, state, OID_AUTO, "is_submitter_processing",
1936 CTLFLAG_RD, &ioat->is_submitter_processing, 0,
1937 "submitter processing");
1939 SYSCTL_ADD_PROC(ctx, state, OID_AUTO, "chansts",
1940 CTLTYPE_STRING | CTLFLAG_RD, ioat, 0, sysctl_handle_chansts, "A",
1941 "String of the channel status");
1943 SYSCTL_ADD_U16(ctx, state, OID_AUTO, "intrdelay", CTLFLAG_RD,
1944 &ioat->cached_intrdelay, 0,
1945 "Current INTRDELAY on this channel (cached, microseconds)");
1947 tmp = SYSCTL_ADD_NODE(ctx, par, OID_AUTO, "hammer", CTLFLAG_RD, NULL,
1948 "Big hammers (mostly for testing)");
1949 hammer = SYSCTL_CHILDREN(tmp);
1951 SYSCTL_ADD_PROC(ctx, hammer, OID_AUTO, "force_hw_reset",
1952 CTLTYPE_INT | CTLFLAG_RW, ioat, 0, sysctl_handle_reset, "I",
1953 "Set to non-zero to reset the hardware");
1955 tmp = SYSCTL_ADD_NODE(ctx, par, OID_AUTO, "stats", CTLFLAG_RD, NULL,
1956 "IOAT channel statistics");
1957 statpar = SYSCTL_CHILDREN(tmp);
1959 SYSCTL_ADD_UQUAD(ctx, statpar, OID_AUTO, "interrupts",
1960 CTLFLAG_RW | CTLFLAG_STATS, &ioat->stats.interrupts,
1961 "Number of interrupts processed on this channel");
1962 SYSCTL_ADD_UQUAD(ctx, statpar, OID_AUTO, "descriptors",
1963 CTLFLAG_RW | CTLFLAG_STATS, &ioat->stats.descriptors_processed,
1964 "Number of descriptors processed on this channel");
1965 SYSCTL_ADD_UQUAD(ctx, statpar, OID_AUTO, "submitted",
1966 CTLFLAG_RW | CTLFLAG_STATS, &ioat->stats.descriptors_submitted,
1967 "Number of descriptors submitted to this channel");
1968 SYSCTL_ADD_UQUAD(ctx, statpar, OID_AUTO, "errored",
1969 CTLFLAG_RW | CTLFLAG_STATS, &ioat->stats.descriptors_error,
1970 "Number of descriptors failed by channel errors");
1971 SYSCTL_ADD_U32(ctx, statpar, OID_AUTO, "halts",
1972 CTLFLAG_RW | CTLFLAG_STATS, &ioat->stats.channel_halts, 0,
1973 "Number of times the channel has halted");
1974 SYSCTL_ADD_U32(ctx, statpar, OID_AUTO, "last_halt_chanerr",
1975 CTLFLAG_RW | CTLFLAG_STATS, &ioat->stats.last_halt_chanerr, 0,
1976 "The raw CHANERR when the channel was last halted");
1978 SYSCTL_ADD_PROC(ctx, statpar, OID_AUTO, "desc_per_interrupt",
1979 CTLTYPE_STRING | CTLFLAG_RD, ioat, 0, sysctl_handle_dpi, "A",
1980 "Descriptors per interrupt");
1984 ioat_get(struct ioat_softc *ioat)
1987 mtx_assert(&ioat->submit_lock, MA_OWNED);
1988 KASSERT(ioat->refcnt < UINT32_MAX, ("refcnt overflow"));
1994 ioat_put(struct ioat_softc *ioat)
1997 mtx_assert(&ioat->submit_lock, MA_OWNED);
1998 KASSERT(ioat->refcnt >= 1, ("refcnt error"));
2000 if (--ioat->refcnt == 0)
2001 wakeup(&ioat->refcnt);
2005 ioat_drain_locked(struct ioat_softc *ioat)
2008 mtx_assert(&ioat->submit_lock, MA_OWNED);
2010 while (ioat->refcnt > 0)
2011 msleep(&ioat->refcnt, &ioat->submit_lock, 0, "ioat_drain", 0);
2015 #define _db_show_lock(lo) LOCK_CLASS(lo)->lc_ddb_show(lo)
2016 #define db_show_lock(lk) _db_show_lock(&(lk)->lock_object)
2017 DB_SHOW_COMMAND(ioat, db_show_ioat)
2019 struct ioat_softc *sc;
2024 idx = (unsigned)addr;
2025 if (idx >= ioat_channel_index)
2028 sc = ioat_channel[idx];
2029 db_printf("ioat softc at %p\n", sc);
2033 db_printf(" version: %d\n", sc->version);
2034 db_printf(" chan_idx: %u\n", sc->chan_idx);
2035 db_printf(" submit_lock: ");
2036 db_show_lock(&sc->submit_lock);
2038 db_printf(" capabilities: %b\n", (int)sc->capabilities,
2040 db_printf(" cached_intrdelay: %u\n", sc->cached_intrdelay);
2041 db_printf(" *comp_update: 0x%jx\n", (uintmax_t)*sc->comp_update);
2043 db_printf(" poll_timer:\n");
2044 db_printf(" c_time: %ju\n", (uintmax_t)sc->poll_timer.c_time);
2045 db_printf(" c_arg: %p\n", sc->poll_timer.c_arg);
2046 db_printf(" c_func: %p\n", sc->poll_timer.c_func);
2047 db_printf(" c_lock: %p\n", sc->poll_timer.c_lock);
2048 db_printf(" c_flags: 0x%x\n", (unsigned)sc->poll_timer.c_flags);
2050 db_printf(" quiescing: %d\n", (int)sc->quiescing);
2051 db_printf(" destroying: %d\n", (int)sc->destroying);
2052 db_printf(" is_submitter_processing: %d\n",
2053 (int)sc->is_submitter_processing);
2054 db_printf(" intrdelay_supported: %d\n", (int)sc->intrdelay_supported);
2055 db_printf(" resetting: %d\n", (int)sc->resetting);
2057 db_printf(" head: %u\n", sc->head);
2058 db_printf(" tail: %u\n", sc->tail);
2059 db_printf(" ring_size_order: %u\n", sc->ring_size_order);
2060 db_printf(" last_seen: 0x%lx\n", sc->last_seen);
2061 db_printf(" ring: %p\n", sc->ring);
2062 db_printf(" descriptors: %p\n", sc->hw_desc_ring);
2063 db_printf(" descriptors (phys): 0x%jx\n",
2064 (uintmax_t)sc->hw_desc_bus_addr);
2066 db_printf(" ring[%u] (tail):\n", sc->tail %
2067 (1 << sc->ring_size_order));
2068 db_printf(" id: %u\n", ioat_get_ring_entry(sc, sc->tail)->id);
2069 db_printf(" addr: 0x%lx\n",
2070 RING_PHYS_ADDR(sc, sc->tail));
2071 db_printf(" next: 0x%lx\n",
2072 ioat_get_descriptor(sc, sc->tail)->generic.next);
2074 db_printf(" ring[%u] (head - 1):\n", (sc->head - 1) %
2075 (1 << sc->ring_size_order));
2076 db_printf(" id: %u\n", ioat_get_ring_entry(sc, sc->head - 1)->id);
2077 db_printf(" addr: 0x%lx\n",
2078 RING_PHYS_ADDR(sc, sc->head - 1));
2079 db_printf(" next: 0x%lx\n",
2080 ioat_get_descriptor(sc, sc->head - 1)->generic.next);
2082 db_printf(" ring[%u] (head):\n", (sc->head) %
2083 (1 << sc->ring_size_order));
2084 db_printf(" id: %u\n", ioat_get_ring_entry(sc, sc->head)->id);
2085 db_printf(" addr: 0x%lx\n",
2086 RING_PHYS_ADDR(sc, sc->head));
2087 db_printf(" next: 0x%lx\n",
2088 ioat_get_descriptor(sc, sc->head)->generic.next);
2090 for (idx = 0; idx < (1 << sc->ring_size_order); idx++)
2091 if ((*sc->comp_update & IOAT_CHANSTS_COMPLETED_DESCRIPTOR_MASK)
2092 == RING_PHYS_ADDR(sc, idx))
2093 db_printf(" ring[%u] == hardware tail\n", idx);
2095 db_printf(" cleanup_lock: ");
2096 db_show_lock(&sc->cleanup_lock);
2098 db_printf(" refcnt: %u\n", sc->refcnt);
2099 db_printf(" stats:\n");
2100 db_printf(" interrupts: %lu\n", sc->stats.interrupts);
2101 db_printf(" descriptors_processed: %lu\n", sc->stats.descriptors_processed);
2102 db_printf(" descriptors_error: %lu\n", sc->stats.descriptors_error);
2103 db_printf(" descriptors_submitted: %lu\n", sc->stats.descriptors_submitted);
2105 db_printf(" channel_halts: %u\n", sc->stats.channel_halts);
2106 db_printf(" last_halt_chanerr: %u\n", sc->stats.last_halt_chanerr);
2111 db_printf(" hw status:\n");
2112 db_printf(" status: 0x%lx\n", ioat_get_chansts(sc));
2113 db_printf(" chanctrl: 0x%x\n",
2114 (unsigned)ioat_read_2(sc, IOAT_CHANCTRL_OFFSET));
2115 db_printf(" chancmd: 0x%x\n",
2116 (unsigned)ioat_read_1(sc, IOAT_CHANCMD_OFFSET));
2117 db_printf(" dmacount: 0x%x\n",
2118 (unsigned)ioat_read_2(sc, IOAT_DMACOUNT_OFFSET));
2119 db_printf(" chainaddr: 0x%lx\n",
2120 ioat_read_double_4(sc, IOAT_CHAINADDR_OFFSET_LOW));
2121 db_printf(" chancmp: 0x%lx\n",
2122 ioat_read_double_4(sc, IOAT_CHANCMP_OFFSET_LOW));
2123 db_printf(" chanerr: %b\n",
2124 (int)ioat_read_4(sc, IOAT_CHANERR_OFFSET), IOAT_CHANERR_STR);
2127 db_printf("usage: show ioat <0-%u>\n", ioat_channel_index);