diff options
Diffstat (limited to 'sys/dev/ioat/ioat.c')
| -rw-r--r-- | sys/dev/ioat/ioat.c | 1009 |
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 0000000..a3bd5ce --- /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); +} |
