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-rw-r--r--sys/dev/ioat/ioat.c1009
1 files changed, 1009 insertions, 0 deletions
diff --git a/sys/dev/ioat/ioat.c b/sys/dev/ioat/ioat.c
new file mode 100644
index 000000000000..a3bd5ce40670
--- /dev/null
+++ b/sys/dev/ioat/ioat.c
@@ -0,0 +1,1009 @@
+/*-
+ * Copyright (C) 2012 Intel Corporation
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/bus.h>
+#include <sys/conf.h>
+#include <sys/ioccom.h>
+#include <sys/kernel.h>
+#include <sys/lock.h>
+#include <sys/malloc.h>
+#include <sys/module.h>
+#include <sys/mutex.h>
+#include <sys/rman.h>
+#include <sys/sysctl.h>
+#include <sys/time.h>
+#include <dev/pci/pcireg.h>
+#include <dev/pci/pcivar.h>
+#include <machine/bus.h>
+#include <machine/resource.h>
+#include <machine/stdarg.h>
+
+#include "ioat.h"
+#include "ioat_hw.h"
+#include "ioat_internal.h"
+
+static int ioat_probe(device_t device);
+static int ioat_attach(device_t device);
+static int ioat_detach(device_t device);
+static int ioat3_attach(device_t device);
+static int ioat_map_pci_bar(struct ioat_softc *ioat);
+static void ioat_dmamap_cb(void *arg, bus_dma_segment_t *segs, int nseg,
+ int error);
+static int ioat_interrupt_setup(struct ioat_softc *ioat);
+static void ioat_interrupt_handler(void *arg);
+static void ioat_process_events(struct ioat_softc *ioat);
+static inline uint32_t ioat_get_active(struct ioat_softc *ioat);
+static inline uint32_t ioat_get_ring_space(struct ioat_softc *ioat);
+static void ioat_free_ring_entry(struct ioat_softc *ioat,
+ struct ioat_descriptor *desc);
+static struct ioat_descriptor * ioat_alloc_ring_entry(struct ioat_softc *ioat);
+static int ioat_reserve_space_and_lock(struct ioat_softc *ioat, int num_descs);
+static struct ioat_descriptor * ioat_get_ring_entry(struct ioat_softc *ioat,
+ uint32_t index);
+static boolean_t resize_ring(struct ioat_softc *ioat, int order);
+static void ioat_timer_callback(void *arg);
+static void dump_descriptor(void *hw_desc);
+static void ioat_submit_single(struct ioat_softc *ioat);
+static void ioat_comp_update_map(void *arg, bus_dma_segment_t *seg, int nseg,
+ int error);
+static int ioat_reset_hw(struct ioat_softc *ioat);
+static void ioat_setup_sysctl(device_t device);
+
+MALLOC_DEFINE(M_IOAT, "ioat", "ioat driver memory allocations");
+SYSCTL_NODE(_hw, OID_AUTO, ioat, CTLFLAG_RD, 0, "ioat node");
+
+static int g_force_legacy_interrupts;
+SYSCTL_INT(_hw_ioat, OID_AUTO, force_legacy_interrupts, CTLFLAG_RDTUN,
+ &g_force_legacy_interrupts, 0, "Set to non-zero to force MSI-X disabled");
+
+static int g_ioat_debug_level = 0;
+SYSCTL_INT(_hw_ioat, OID_AUTO, debug_level, CTLFLAG_RWTUN, &g_ioat_debug_level,
+ 0, "Set log level (0-3) for ioat(4). Higher is more verbose.");
+
+/*
+ * OS <-> Driver interface structures
+ */
+static device_method_t ioat_pci_methods[] = {
+ /* Device interface */
+ DEVMETHOD(device_probe, ioat_probe),
+ DEVMETHOD(device_attach, ioat_attach),
+ DEVMETHOD(device_detach, ioat_detach),
+ { 0, 0 }
+};
+
+static driver_t ioat_pci_driver = {
+ "ioat",
+ ioat_pci_methods,
+ sizeof(struct ioat_softc),
+};
+
+static devclass_t ioat_devclass;
+DRIVER_MODULE(ioat, pci, ioat_pci_driver, ioat_devclass, 0, 0);
+
+/*
+ * Private data structures
+ */
+static struct ioat_softc *ioat_channel[IOAT_MAX_CHANNELS];
+static int ioat_channel_index = 0;
+SYSCTL_INT(_hw_ioat, OID_AUTO, channels, CTLFLAG_RD, &ioat_channel_index, 0,
+ "Number of IOAT channels attached");
+
+static struct _pcsid
+{
+ u_int32_t type;
+ const char *desc;
+} pci_ids[] = {
+ { 0x34308086, "TBG IOAT Ch0" },
+ { 0x34318086, "TBG IOAT Ch1" },
+ { 0x34328086, "TBG IOAT Ch2" },
+ { 0x34338086, "TBG IOAT Ch3" },
+ { 0x34298086, "TBG IOAT Ch4" },
+ { 0x342a8086, "TBG IOAT Ch5" },
+ { 0x342b8086, "TBG IOAT Ch6" },
+ { 0x342c8086, "TBG IOAT Ch7" },
+
+ { 0x37108086, "JSF IOAT Ch0" },
+ { 0x37118086, "JSF IOAT Ch1" },
+ { 0x37128086, "JSF IOAT Ch2" },
+ { 0x37138086, "JSF IOAT Ch3" },
+ { 0x37148086, "JSF IOAT Ch4" },
+ { 0x37158086, "JSF IOAT Ch5" },
+ { 0x37168086, "JSF IOAT Ch6" },
+ { 0x37178086, "JSF IOAT Ch7" },
+ { 0x37188086, "JSF IOAT Ch0 (RAID)" },
+ { 0x37198086, "JSF IOAT Ch1 (RAID)" },
+
+ { 0x3c208086, "SNB IOAT Ch0" },
+ { 0x3c218086, "SNB IOAT Ch1" },
+ { 0x3c228086, "SNB IOAT Ch2" },
+ { 0x3c238086, "SNB IOAT Ch3" },
+ { 0x3c248086, "SNB IOAT Ch4" },
+ { 0x3c258086, "SNB IOAT Ch5" },
+ { 0x3c268086, "SNB IOAT Ch6" },
+ { 0x3c278086, "SNB IOAT Ch7" },
+ { 0x3c2e8086, "SNB IOAT Ch0 (RAID)" },
+ { 0x3c2f8086, "SNB IOAT Ch1 (RAID)" },
+
+ { 0x0e208086, "IVB IOAT Ch0" },
+ { 0x0e218086, "IVB IOAT Ch1" },
+ { 0x0e228086, "IVB IOAT Ch2" },
+ { 0x0e238086, "IVB IOAT Ch3" },
+ { 0x0e248086, "IVB IOAT Ch4" },
+ { 0x0e258086, "IVB IOAT Ch5" },
+ { 0x0e268086, "IVB IOAT Ch6" },
+ { 0x0e278086, "IVB IOAT Ch7" },
+ { 0x0e2e8086, "IVB IOAT Ch0 (RAID)" },
+ { 0x0e2f8086, "IVB IOAT Ch1 (RAID)" },
+
+ { 0x2f208086, "HSW IOAT Ch0" },
+ { 0x2f218086, "HSW IOAT Ch1" },
+ { 0x2f228086, "HSW IOAT Ch2" },
+ { 0x2f238086, "HSW IOAT Ch3" },
+ { 0x2f248086, "HSW IOAT Ch4" },
+ { 0x2f258086, "HSW IOAT Ch5" },
+ { 0x2f268086, "HSW IOAT Ch6" },
+ { 0x2f278086, "HSW IOAT Ch7" },
+ { 0x2f2e8086, "HSW IOAT Ch0 (RAID)" },
+ { 0x2f2f8086, "HSW IOAT Ch1 (RAID)" },
+
+ { 0x0c508086, "BWD IOAT Ch0" },
+ { 0x0c518086, "BWD IOAT Ch1" },
+ { 0x0c528086, "BWD IOAT Ch2" },
+ { 0x0c538086, "BWD IOAT Ch3" },
+
+ { 0x6f508086, "BDXDE IOAT Ch0" },
+ { 0x6f518086, "BDXDE IOAT Ch1" },
+ { 0x6f528086, "BDXDE IOAT Ch2" },
+ { 0x6f538086, "BDXDE IOAT Ch3" },
+
+ { 0x00000000, NULL }
+};
+
+/*
+ * OS <-> Driver linkage functions
+ */
+static int
+ioat_probe(device_t device)
+{
+ struct _pcsid *ep;
+ u_int32_t type;
+
+ type = pci_get_devid(device);
+ for (ep = pci_ids; ep->type; ep++) {
+ if (ep->type == type) {
+ device_set_desc(device, ep->desc);
+ return (0);
+ }
+ }
+ return (ENXIO);
+}
+
+static int
+ioat_attach(device_t device)
+{
+ struct ioat_softc *ioat;
+ int error;
+
+ ioat = DEVICE2SOFTC(device);
+ ioat->device = device;
+
+ error = ioat_map_pci_bar(ioat);
+ if (error != 0)
+ goto err;
+
+ ioat->version = ioat_read_cbver(ioat);
+ ioat_interrupt_setup(ioat);
+
+ if (ioat->version < IOAT_VER_3_0) {
+ error = ENODEV;
+ goto err;
+ }
+
+ error = ioat3_attach(device);
+ if (error != 0)
+ goto err;
+
+ error = pci_enable_busmaster(device);
+ if (error != 0)
+ goto err;
+
+ ioat_channel[ioat_channel_index++] = ioat;
+
+err:
+ if (error != 0)
+ ioat_detach(device);
+ return (error);
+}
+
+static int
+ioat_detach(device_t device)
+{
+ struct ioat_softc *ioat;
+ uint32_t i;
+
+ ioat = DEVICE2SOFTC(device);
+ callout_drain(&ioat->timer);
+
+ pci_disable_busmaster(device);
+
+ if (ioat->pci_resource != NULL)
+ bus_release_resource(device, SYS_RES_MEMORY,
+ ioat->pci_resource_id, ioat->pci_resource);
+
+ if (ioat->ring != NULL) {
+ for (i = 0; i < (1 << ioat->ring_size_order); i++)
+ ioat_free_ring_entry(ioat, ioat->ring[i]);
+ free(ioat->ring, M_IOAT);
+ }
+
+ if (ioat->comp_update != NULL) {
+ bus_dmamap_unload(ioat->comp_update_tag, ioat->comp_update_map);
+ bus_dmamem_free(ioat->comp_update_tag, ioat->comp_update,
+ ioat->comp_update_map);
+ bus_dma_tag_destroy(ioat->comp_update_tag);
+ }
+
+ bus_dma_tag_destroy(ioat->hw_desc_tag);
+
+ if (ioat->tag != NULL)
+ bus_teardown_intr(device, ioat->res, ioat->tag);
+
+ if (ioat->res != NULL)
+ bus_release_resource(device, SYS_RES_IRQ,
+ rman_get_rid(ioat->res), ioat->res);
+
+ pci_release_msi(device);
+
+ return (0);
+}
+
+static int
+ioat3_selftest(struct ioat_softc *ioat)
+{
+ uint64_t status;
+ uint32_t chanerr;
+ int i;
+
+ ioat_acquire(&ioat->dmaengine);
+ ioat_null(&ioat->dmaengine, NULL, NULL, 0);
+ ioat_release(&ioat->dmaengine);
+
+ for (i = 0; i < 100; i++) {
+ DELAY(1);
+ status = ioat_get_chansts(ioat);
+ if (is_ioat_idle(status))
+ return (0);
+ }
+
+ chanerr = ioat_read_4(ioat, IOAT_CHANERR_OFFSET);
+ ioat_log_message(0, "could not start channel: "
+ "status = %#jx error = %x\n", (uintmax_t)status, chanerr);
+ return (ENXIO);
+}
+
+/*
+ * Initialize Hardware
+ */
+static int
+ioat3_attach(device_t device)
+{
+ struct ioat_softc *ioat;
+ struct ioat_descriptor **ring;
+ struct ioat_descriptor *next;
+ struct ioat_dma_hw_descriptor *dma_hw_desc;
+ uint32_t capabilities;
+ int i, num_descriptors;
+ int error;
+ uint8_t xfercap;
+
+ error = 0;
+ ioat = DEVICE2SOFTC(device);
+ capabilities = ioat_read_dmacapability(ioat);
+
+ xfercap = ioat_read_xfercap(ioat);
+
+ /* Only bits [4:0] are valid. */
+ xfercap &= 0x1f;
+ ioat->max_xfer_size = 1 << xfercap;
+
+ /* TODO: need to check DCA here if we ever do XOR/PQ */
+
+ mtx_init(&ioat->submit_lock, "ioat_submit", NULL, MTX_DEF);
+ mtx_init(&ioat->cleanup_lock, "ioat_process_events", NULL, MTX_DEF);
+ callout_init(&ioat->timer, CALLOUT_MPSAFE);
+
+ ioat->is_resize_pending = FALSE;
+ ioat->is_completion_pending = FALSE;
+ ioat->is_reset_pending = FALSE;
+ ioat->is_channel_running = FALSE;
+ ioat->is_waiting_for_ack = FALSE;
+
+ bus_dma_tag_create(bus_get_dma_tag(ioat->device), sizeof(uint64_t), 0x0,
+ BUS_SPACE_MAXADDR, BUS_SPACE_MAXADDR, NULL, NULL,
+ sizeof(uint64_t), 1, sizeof(uint64_t), 0, NULL, NULL,
+ &ioat->comp_update_tag);
+
+ error = bus_dmamem_alloc(ioat->comp_update_tag,
+ (void **)&ioat->comp_update, BUS_DMA_ZERO, &ioat->comp_update_map);
+ if (ioat->comp_update == NULL)
+ return (ENOMEM);
+
+ error = bus_dmamap_load(ioat->comp_update_tag, ioat->comp_update_map,
+ ioat->comp_update, sizeof(uint64_t), ioat_comp_update_map, ioat,
+ 0);
+ if (error != 0)
+ return (error);
+
+ ioat->ring_size_order = IOAT_MIN_ORDER;
+
+ num_descriptors = 1 << ioat->ring_size_order;
+
+ bus_dma_tag_create(bus_get_dma_tag(ioat->device), 0x40, 0x0,
+ BUS_SPACE_MAXADDR, BUS_SPACE_MAXADDR, NULL, NULL,
+ sizeof(struct ioat_dma_hw_descriptor), 1,
+ sizeof(struct ioat_dma_hw_descriptor), 0, NULL, NULL,
+ &ioat->hw_desc_tag);
+
+ ioat->ring = malloc(num_descriptors * sizeof(*ring), M_IOAT,
+ M_ZERO | M_NOWAIT);
+ if (ioat->ring == NULL)
+ return (ENOMEM);
+
+ ring = ioat->ring;
+ for (i = 0; i < num_descriptors; i++) {
+ ring[i] = ioat_alloc_ring_entry(ioat);
+ if (ring[i] == NULL)
+ return (ENOMEM);
+
+ ring[i]->id = i;
+ }
+
+ for (i = 0; i < num_descriptors - 1; i++) {
+ next = ring[i + 1];
+ dma_hw_desc = ring[i]->u.dma;
+
+ dma_hw_desc->next = next->hw_desc_bus_addr;
+ }
+
+ ring[i]->u.dma->next = ring[0]->hw_desc_bus_addr;
+
+ ioat->head = 0;
+ ioat->tail = 0;
+ ioat->last_seen = 0;
+
+ error = ioat_reset_hw(ioat);
+ if (error != 0)
+ return (error);
+
+ ioat_write_chanctrl(ioat, IOAT_CHANCTRL_RUN);
+ ioat_write_chancmp(ioat, ioat->comp_update_bus_addr);
+ ioat_write_chainaddr(ioat, ring[0]->hw_desc_bus_addr);
+
+ error = ioat3_selftest(ioat);
+ if (error != 0)
+ return (error);
+
+ ioat_process_events(ioat);
+ ioat_setup_sysctl(device);
+ return (0);
+}
+
+static int
+ioat_map_pci_bar(struct ioat_softc *ioat)
+{
+
+ ioat->pci_resource_id = PCIR_BAR(0);
+ ioat->pci_resource = bus_alloc_resource(ioat->device, SYS_RES_MEMORY,
+ &ioat->pci_resource_id, 0, ~0, 1, RF_ACTIVE);
+
+ if (ioat->pci_resource == NULL) {
+ ioat_log_message(0, "unable to allocate pci resource\n");
+ return (ENODEV);
+ }
+
+ ioat->pci_bus_tag = rman_get_bustag(ioat->pci_resource);
+ ioat->pci_bus_handle = rman_get_bushandle(ioat->pci_resource);
+ return (0);
+}
+
+static void
+ioat_comp_update_map(void *arg, bus_dma_segment_t *seg, int nseg, int error)
+{
+ struct ioat_softc *ioat = arg;
+
+ ioat->comp_update_bus_addr = seg[0].ds_addr;
+}
+
+static void
+ioat_dmamap_cb(void *arg, bus_dma_segment_t *segs, int nseg, int error)
+{
+ bus_addr_t *baddr;
+
+ baddr = arg;
+ *baddr = segs->ds_addr;
+}
+
+/*
+ * Interrupt setup and handlers
+ */
+static int
+ioat_interrupt_setup(struct ioat_softc *ioat)
+{
+ uint32_t num_vectors;
+ int error;
+ boolean_t use_msix;
+ boolean_t force_legacy_interrupts;
+
+ use_msix = FALSE;
+ force_legacy_interrupts = FALSE;
+
+ if (!g_force_legacy_interrupts && pci_msix_count(ioat->device) >= 1) {
+ num_vectors = 1;
+ pci_alloc_msix(ioat->device, &num_vectors);
+ if (num_vectors == 1)
+ use_msix = TRUE;
+ }
+
+ if (use_msix) {
+ ioat->rid = 1;
+ ioat->res = bus_alloc_resource_any(ioat->device, SYS_RES_IRQ,
+ &ioat->rid, RF_ACTIVE);
+ } else {
+ ioat->rid = 0;
+ ioat->res = bus_alloc_resource_any(ioat->device, SYS_RES_IRQ,
+ &ioat->rid, RF_SHAREABLE | RF_ACTIVE);
+ }
+ if (ioat->res == NULL) {
+ ioat_log_message(0, "bus_alloc_resource failed\n");
+ return (ENOMEM);
+ }
+
+ ioat->tag = NULL;
+ error = bus_setup_intr(ioat->device, ioat->res, INTR_MPSAFE |
+ INTR_TYPE_MISC, NULL, ioat_interrupt_handler, ioat, &ioat->tag);
+ if (error != 0) {
+ ioat_log_message(0, "bus_setup_intr failed\n");
+ return (error);
+ }
+
+ ioat_write_intrctrl(ioat, IOAT_INTRCTRL_MASTER_INT_EN);
+ return (0);
+}
+
+static void
+ioat_interrupt_handler(void *arg)
+{
+ struct ioat_softc *ioat = arg;
+
+ ioat_process_events(ioat);
+}
+
+static void
+ioat_process_events(struct ioat_softc *ioat)
+{
+ struct ioat_descriptor *desc;
+ struct bus_dmadesc *dmadesc;
+ uint64_t comp_update, status;
+ uint32_t completed;
+
+ mtx_lock(&ioat->cleanup_lock);
+
+ completed = 0;
+ comp_update = *ioat->comp_update;
+ status = comp_update & IOAT_CHANSTS_COMPLETED_DESCRIPTOR_MASK;
+
+ ioat_log_message(3, "%s\n", __func__);
+
+ if (status == ioat->last_seen) {
+ mtx_unlock(&ioat->cleanup_lock);
+ return;
+ }
+
+ while (1) {
+ desc = ioat_get_ring_entry(ioat, ioat->tail);
+ dmadesc = &desc->bus_dmadesc;
+ ioat_log_message(3, "completing desc %d\n", ioat->tail);
+
+ if (dmadesc->callback_fn)
+ (*dmadesc->callback_fn)(dmadesc->callback_arg);
+
+ ioat->tail++;
+ if (desc->hw_desc_bus_addr == status)
+ break;
+ }
+
+ ioat->last_seen = desc->hw_desc_bus_addr;
+
+ if (ioat->head == ioat->tail) {
+ ioat->is_completion_pending = FALSE;
+ callout_reset(&ioat->timer, 5 * hz, ioat_timer_callback, ioat);
+ }
+
+ ioat_write_chanctrl(ioat, IOAT_CHANCTRL_RUN);
+ mtx_unlock(&ioat->cleanup_lock);
+}
+
+/*
+ * User API functions
+ */
+bus_dmaengine_t
+ioat_get_dmaengine(uint32_t index)
+{
+
+ if (index < ioat_channel_index)
+ return (&ioat_channel[index]->dmaengine);
+ return (NULL);
+}
+
+void
+ioat_acquire(bus_dmaengine_t dmaengine)
+{
+ struct ioat_softc *ioat;
+
+ ioat = to_ioat_softc(dmaengine);
+ mtx_lock(&ioat->submit_lock);
+ ioat_log_message(3, "%s\n", __func__);
+}
+
+void
+ioat_release(bus_dmaengine_t dmaengine)
+{
+ struct ioat_softc *ioat;
+
+ ioat_log_message(3, "%s\n", __func__);
+ ioat = to_ioat_softc(dmaengine);
+ ioat_write_2(ioat, IOAT_DMACOUNT_OFFSET, (uint16_t)ioat->head);
+ mtx_unlock(&ioat->submit_lock);
+}
+
+struct bus_dmadesc *
+ioat_null(bus_dmaengine_t dmaengine, bus_dmaengine_callback_t callback_fn,
+ void *callback_arg, uint32_t flags)
+{
+ struct ioat_softc *ioat;
+ struct ioat_descriptor *desc;
+ struct ioat_dma_hw_descriptor *hw_desc;
+
+ KASSERT((flags & ~DMA_ALL_FLAGS) == 0, ("Unrecognized flag(s): %#x",
+ flags & ~DMA_ALL_FLAGS));
+
+ ioat = to_ioat_softc(dmaengine);
+
+ if (ioat_reserve_space_and_lock(ioat, 1) != 0)
+ return (NULL);
+
+ ioat_log_message(3, "%s\n", __func__);
+
+ desc = ioat_get_ring_entry(ioat, ioat->head);
+ hw_desc = desc->u.dma;
+
+ hw_desc->u.control_raw = 0;
+ hw_desc->u.control.null = 1;
+ hw_desc->u.control.completion_update = 1;
+
+ if ((flags & DMA_INT_EN) != 0)
+ hw_desc->u.control.int_enable = 1;
+
+ hw_desc->size = 8;
+ hw_desc->src_addr = 0;
+ hw_desc->dest_addr = 0;
+
+ desc->bus_dmadesc.callback_fn = callback_fn;
+ desc->bus_dmadesc.callback_arg = callback_arg;
+
+ ioat_submit_single(ioat);
+ return (&desc->bus_dmadesc);
+}
+
+struct bus_dmadesc *
+ioat_copy(bus_dmaengine_t dmaengine, bus_addr_t dst,
+ bus_addr_t src, bus_size_t len, bus_dmaengine_callback_t callback_fn,
+ void *callback_arg, uint32_t flags)
+{
+ struct ioat_descriptor *desc;
+ struct ioat_dma_hw_descriptor *hw_desc;
+ struct ioat_softc *ioat;
+
+ KASSERT((flags & ~DMA_ALL_FLAGS) == 0, ("Unrecognized flag(s): %#x",
+ flags & ~DMA_ALL_FLAGS));
+
+ ioat = to_ioat_softc(dmaengine);
+
+ if (len > ioat->max_xfer_size) {
+ ioat_log_message(0, "%s: max_xfer_size = %d, requested = %d\n",
+ __func__, ioat->max_xfer_size, (int)len);
+ return (NULL);
+ }
+
+ if (ioat_reserve_space_and_lock(ioat, 1) != 0)
+ return (NULL);
+
+ ioat_log_message(3, "%s\n", __func__);
+
+ desc = ioat_get_ring_entry(ioat, ioat->head);
+ hw_desc = desc->u.dma;
+
+ hw_desc->u.control_raw = 0;
+ hw_desc->u.control.completion_update = 1;
+
+ if ((flags & DMA_INT_EN) != 0)
+ hw_desc->u.control.int_enable = 1;
+
+ hw_desc->size = len;
+ hw_desc->src_addr = src;
+ hw_desc->dest_addr = dst;
+
+ if (g_ioat_debug_level >= 3)
+ dump_descriptor(hw_desc);
+
+ desc->bus_dmadesc.callback_fn = callback_fn;
+ desc->bus_dmadesc.callback_arg = callback_arg;
+
+ ioat_submit_single(ioat);
+ return (&desc->bus_dmadesc);
+}
+
+/*
+ * Ring Management
+ */
+static inline uint32_t
+ioat_get_active(struct ioat_softc *ioat)
+{
+
+ return ((ioat->head - ioat->tail) & ((1 << ioat->ring_size_order) - 1));
+}
+
+static inline uint32_t
+ioat_get_ring_space(struct ioat_softc *ioat)
+{
+
+ return ((1 << ioat->ring_size_order) - ioat_get_active(ioat) - 1);
+}
+
+static struct ioat_descriptor *
+ioat_alloc_ring_entry(struct ioat_softc *ioat)
+{
+ struct ioat_dma_hw_descriptor *hw_desc;
+ struct ioat_descriptor *desc;
+
+ desc = malloc(sizeof(struct ioat_descriptor), M_IOAT, M_NOWAIT);
+ if (desc == NULL)
+ return (NULL);
+
+ bus_dmamem_alloc(ioat->hw_desc_tag, (void **)&hw_desc, BUS_DMA_ZERO,
+ &ioat->hw_desc_map);
+ if (hw_desc == NULL) {
+ free(desc, M_IOAT);
+ return (NULL);
+ }
+
+ bus_dmamap_load(ioat->hw_desc_tag, ioat->hw_desc_map, hw_desc,
+ sizeof(*hw_desc), ioat_dmamap_cb, &desc->hw_desc_bus_addr, 0);
+
+ desc->u.dma = hw_desc;
+ return (desc);
+}
+
+static void
+ioat_free_ring_entry(struct ioat_softc *ioat, struct ioat_descriptor *desc)
+{
+
+ if (desc == NULL)
+ return;
+
+ if (desc->u.dma)
+ bus_dmamem_free(ioat->hw_desc_tag, desc->u.dma,
+ ioat->hw_desc_map);
+ free(desc, M_IOAT);
+}
+
+static int
+ioat_reserve_space_and_lock(struct ioat_softc *ioat, int num_descs)
+{
+ boolean_t retry;
+
+ while (1) {
+ if (ioat_get_ring_space(ioat) >= num_descs)
+ return (0);
+
+ mtx_lock(&ioat->cleanup_lock);
+ retry = resize_ring(ioat, ioat->ring_size_order + 1);
+ mtx_unlock(&ioat->cleanup_lock);
+
+ if (!retry)
+ return (ENOMEM);
+ }
+}
+
+static struct ioat_descriptor *
+ioat_get_ring_entry(struct ioat_softc *ioat, uint32_t index)
+{
+
+ return (ioat->ring[index % (1 << ioat->ring_size_order)]);
+}
+
+static boolean_t
+resize_ring(struct ioat_softc *ioat, int order)
+{
+ struct ioat_descriptor **ring;
+ struct ioat_descriptor *next;
+ struct ioat_dma_hw_descriptor *hw;
+ struct ioat_descriptor *ent;
+ uint32_t current_size, active, new_size, i, new_idx, current_idx;
+ uint32_t new_idx2;
+
+ current_size = 1 << ioat->ring_size_order;
+ active = (ioat->head - ioat->tail) & (current_size - 1);
+ new_size = 1 << order;
+
+ if (order > IOAT_MAX_ORDER)
+ return (FALSE);
+
+ /*
+ * when shrinking, verify that we can hold the current active
+ * set in the new ring
+ */
+ if (active >= new_size)
+ return (FALSE);
+
+ /* allocate the array to hold the software ring */
+ ring = malloc(new_size * sizeof(*ring), M_IOAT, M_ZERO | M_NOWAIT);
+ if (ring == NULL)
+ return (FALSE);
+
+ ioat_log_message(2, "ring resize: new: %d old: %d\n",
+ new_size, current_size);
+
+ /* allocate/trim descriptors as needed */
+ if (new_size > current_size) {
+ /* copy current descriptors to the new ring */
+ for (i = 0; i < current_size; i++) {
+ current_idx = (ioat->tail + i) & (current_size - 1);
+ new_idx = (ioat->tail + i) & (new_size - 1);
+
+ ring[new_idx] = ioat->ring[current_idx];
+ ring[new_idx]->id = new_idx;
+ }
+
+ /* add new descriptors to the ring */
+ for (i = current_size; i < new_size; i++) {
+ new_idx = (ioat->tail + i) & (new_size - 1);
+
+ ring[new_idx] = ioat_alloc_ring_entry(ioat);
+ if (!ring[new_idx]) {
+ while (i--) {
+ new_idx2 = (ioat->tail + i) &
+ (new_size - 1);
+
+ ioat_free_ring_entry(ioat,
+ ring[new_idx2]);
+ }
+ free(ring, M_IOAT);
+ return (FALSE);
+ }
+ ring[new_idx]->id = new_idx;
+ }
+
+ for (i = current_size - 1; i < new_size; i++) {
+ new_idx = (ioat->tail + i) & (new_size - 1);
+ next = ring[(new_idx + 1) & (new_size - 1)];
+ hw = ring[new_idx]->u.dma;
+
+ hw->next = next->hw_desc_bus_addr;
+ }
+ } else {
+ /*
+ * copy current descriptors to the new ring, dropping the
+ * removed descriptors
+ */
+ for (i = 0; i < new_size; i++) {
+ current_idx = (ioat->tail + i) & (current_size - 1);
+ new_idx = (ioat->tail + i) & (new_size - 1);
+
+ ring[new_idx] = ioat->ring[current_idx];
+ ring[new_idx]->id = new_idx;
+ }
+
+ /* free deleted descriptors */
+ for (i = new_size; i < current_size; i++) {
+ ent = ioat_get_ring_entry(ioat, ioat->tail + i);
+ ioat_free_ring_entry(ioat, ent);
+ }
+
+ /* fix up hardware ring */
+ hw = ring[(ioat->tail + new_size - 1) & (new_size - 1)]->u.dma;
+ next = ring[(ioat->tail + new_size) & (new_size - 1)];
+ hw->next = next->hw_desc_bus_addr;
+ }
+
+ free(ioat->ring, M_IOAT);
+ ioat->ring = ring;
+ ioat->ring_size_order = order;
+
+ return (TRUE);
+}
+
+static void
+ioat_timer_callback(void *arg)
+{
+ struct ioat_descriptor *desc;
+ struct ioat_softc *ioat;
+ uint64_t status;
+ uint32_t chanerr;
+
+ ioat = arg;
+ ioat_log_message(2, "%s\n", __func__);
+
+ if (ioat->is_completion_pending) {
+ status = ioat_get_chansts(ioat);
+
+ /*
+ * When halted due to errors, check for channel programming
+ * errors before advancing the completion state.
+ */
+ if (is_ioat_halted(status)) {
+ chanerr = ioat_read_4(ioat, IOAT_CHANERR_OFFSET);
+ ioat_log_message(0, "Channel halted (%x)\n", chanerr);
+
+ desc = ioat_get_ring_entry(ioat, ioat->tail + 0);
+ dump_descriptor(desc->u.raw);
+
+ desc = ioat_get_ring_entry(ioat, ioat->tail + 1);
+ dump_descriptor(desc->u.raw);
+ }
+ ioat_process_events(ioat);
+ } else {
+ mtx_lock(&ioat->submit_lock);
+ mtx_lock(&ioat->cleanup_lock);
+
+ if (ioat_get_active(ioat) == 0 &&
+ ioat->ring_size_order > IOAT_MIN_ORDER)
+ resize_ring(ioat, ioat->ring_size_order - 1);
+
+ mtx_unlock(&ioat->cleanup_lock);
+ mtx_unlock(&ioat->submit_lock);
+
+ if (ioat->ring_size_order > IOAT_MIN_ORDER)
+ callout_reset(&ioat->timer, 5 * hz,
+ ioat_timer_callback, ioat);
+ }
+}
+
+/*
+ * Support Functions
+ */
+static void
+ioat_submit_single(struct ioat_softc *ioat)
+{
+
+ atomic_add_rel_int(&ioat->head, 1);
+
+ if (!ioat->is_completion_pending) {
+ ioat->is_completion_pending = TRUE;
+ callout_reset(&ioat->timer, 10 * hz, ioat_timer_callback,
+ ioat);
+ }
+}
+
+static int
+ioat_reset_hw(struct ioat_softc *ioat)
+{
+ uint64_t status;
+ uint32_t chanerr;
+ int timeout;
+
+ status = ioat_get_chansts(ioat);
+ if (is_ioat_active(status) || is_ioat_idle(status))
+ ioat_suspend(ioat);
+
+ /* Wait at most 20 ms */
+ for (timeout = 0; (is_ioat_active(status) || is_ioat_idle(status)) &&
+ timeout < 20; timeout++) {
+ DELAY(1000);
+ status = ioat_get_chansts(ioat);
+ }
+ if (timeout == 20)
+ return (ETIMEDOUT);
+
+ chanerr = ioat_read_4(ioat, IOAT_CHANERR_OFFSET);
+ ioat_write_4(ioat, IOAT_CHANERR_OFFSET, chanerr);
+
+ /*
+ * IOAT v3 workaround - CHANERRMSK_INT with 3E07h to masks out errors
+ * that can cause stability issues for IOAT v3.
+ */
+ pci_write_config(ioat->device, IOAT_CFG_CHANERRMASK_INT_OFFSET, 0x3e07,
+ 4);
+ chanerr = pci_read_config(ioat->device, IOAT_CFG_CHANERR_INT_OFFSET, 4);
+ pci_write_config(ioat->device, IOAT_CFG_CHANERR_INT_OFFSET, chanerr, 4);
+
+ ioat_reset(ioat);
+
+ /* Wait at most 20 ms */
+ for (timeout = 0; ioat_reset_pending(ioat) && timeout < 20; timeout++)
+ DELAY(1000);
+ if (timeout == 20)
+ return (ETIMEDOUT);
+
+ return (0);
+}
+
+static void
+dump_descriptor(void *hw_desc)
+{
+ int i, j;
+
+ for (i = 0; i < 2; i++) {
+ for (j = 0; j < 8; j++)
+ printf("%08x ", ((uint32_t *)hw_desc)[i * 8 + j]);
+ printf("\n");
+ }
+}
+
+static void
+ioat_setup_sysctl(device_t device)
+{
+ struct sysctl_ctx_list *sysctl_ctx;
+ struct sysctl_oid *sysctl_tree;
+ struct ioat_softc *ioat;
+
+ ioat = DEVICE2SOFTC(device);
+ sysctl_ctx = device_get_sysctl_ctx(device);
+ sysctl_tree = device_get_sysctl_tree(device);
+
+ SYSCTL_ADD_UINT(sysctl_ctx, SYSCTL_CHILDREN(sysctl_tree), OID_AUTO,
+ "ring_size_order", CTLFLAG_RD, &ioat->ring_size_order,
+ 0, "HW descriptor ring size order");
+ SYSCTL_ADD_UINT(sysctl_ctx, SYSCTL_CHILDREN(sysctl_tree), OID_AUTO,
+ "head", CTLFLAG_RD, &ioat->head,
+ 0, "HW descriptor head pointer index");
+ SYSCTL_ADD_UINT(sysctl_ctx, SYSCTL_CHILDREN(sysctl_tree), OID_AUTO,
+ "tail", CTLFLAG_RD, &ioat->tail,
+ 0, "HW descriptor tail pointer index");
+}
+
+void
+ioat_log_message(int verbosity, char *fmt, ...)
+{
+ va_list argp;
+ char buffer[512];
+ struct timeval tv;
+
+ if (verbosity > g_ioat_debug_level)
+ return;
+
+ va_start(argp, fmt);
+ vsnprintf(buffer, sizeof(buffer) - 1, fmt, argp);
+ va_end(argp);
+ microuptime(&tv);
+
+ printf("[%d:%06d] ioat: %s", (int)tv.tv_sec, (int)tv.tv_usec, buffer);
+}