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-rw-r--r--drivers/dma/ioat/Makefile3
-rw-r--r--drivers/dma/ioat/dca.c331
-rw-r--r--drivers/dma/ioat/dma.c1061
-rw-r--r--drivers/dma/ioat/dma.h406
-rw-r--r--drivers/dma/ioat/hw.h271
-rw-r--r--drivers/dma/ioat/init.c1455
-rw-r--r--drivers/dma/ioat/prep.c737
-rw-r--r--drivers/dma/ioat/registers.h258
-rw-r--r--drivers/dma/ioat/sysfs.c166
9 files changed, 4688 insertions, 0 deletions
diff --git a/drivers/dma/ioat/Makefile b/drivers/dma/ioat/Makefile
new file mode 100644
index 000000000..86638a608
--- /dev/null
+++ b/drivers/dma/ioat/Makefile
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_INTEL_IOATDMA) += ioatdma.o
+ioatdma-y := init.o dma.o prep.o dca.o sysfs.o
diff --git a/drivers/dma/ioat/dca.c b/drivers/dma/ioat/dca.c
new file mode 100644
index 000000000..289c59ed7
--- /dev/null
+++ b/drivers/dma/ioat/dca.c
@@ -0,0 +1,331 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Intel I/OAT DMA Linux driver
+ * Copyright(c) 2007 - 2009 Intel Corporation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/smp.h>
+#include <linux/interrupt.h>
+#include <linux/dca.h>
+
+/* either a kernel change is needed, or we need something like this in kernel */
+#ifndef CONFIG_SMP
+#include <asm/smp.h>
+#undef cpu_physical_id
+#define cpu_physical_id(cpu) (cpuid_ebx(1) >> 24)
+#endif
+
+#include "dma.h"
+#include "registers.h"
+
+/*
+ * Bit 7 of a tag map entry is the "valid" bit, if it is set then bits 0:6
+ * contain the bit number of the APIC ID to map into the DCA tag. If the valid
+ * bit is not set, then the value must be 0 or 1 and defines the bit in the tag.
+ */
+#define DCA_TAG_MAP_VALID 0x80
+
+#define DCA3_TAG_MAP_BIT_TO_INV 0x80
+#define DCA3_TAG_MAP_BIT_TO_SEL 0x40
+#define DCA3_TAG_MAP_LITERAL_VAL 0x1
+
+#define DCA_TAG_MAP_MASK 0xDF
+
+/* expected tag map bytes for I/OAT ver.2 */
+#define DCA2_TAG_MAP_BYTE0 0x80
+#define DCA2_TAG_MAP_BYTE1 0x0
+#define DCA2_TAG_MAP_BYTE2 0x81
+#define DCA2_TAG_MAP_BYTE3 0x82
+#define DCA2_TAG_MAP_BYTE4 0x82
+
+/*
+ * "Legacy" DCA systems do not implement the DCA register set in the
+ * I/OAT device. Software needs direct support for their tag mappings.
+ */
+
+#define APICID_BIT(x) (DCA_TAG_MAP_VALID | (x))
+#define IOAT_TAG_MAP_LEN 8
+
+/* pack PCI B/D/F into a u16 */
+static inline u16 dcaid_from_pcidev(struct pci_dev *pci)
+{
+ return (pci->bus->number << 8) | pci->devfn;
+}
+
+static int dca_enabled_in_bios(struct pci_dev *pdev)
+{
+ /* CPUID level 9 returns DCA configuration */
+ /* Bit 0 indicates DCA enabled by the BIOS */
+ unsigned long cpuid_level_9;
+ int res;
+
+ cpuid_level_9 = cpuid_eax(9);
+ res = test_bit(0, &cpuid_level_9);
+ if (!res)
+ dev_dbg(&pdev->dev, "DCA is disabled in BIOS\n");
+
+ return res;
+}
+
+int system_has_dca_enabled(struct pci_dev *pdev)
+{
+ if (boot_cpu_has(X86_FEATURE_DCA))
+ return dca_enabled_in_bios(pdev);
+
+ dev_dbg(&pdev->dev, "boot cpu doesn't have X86_FEATURE_DCA\n");
+ return 0;
+}
+
+struct ioat_dca_slot {
+ struct pci_dev *pdev; /* requester device */
+ u16 rid; /* requester id, as used by IOAT */
+};
+
+#define IOAT_DCA_MAX_REQ 6
+#define IOAT3_DCA_MAX_REQ 2
+
+struct ioat_dca_priv {
+ void __iomem *iobase;
+ void __iomem *dca_base;
+ int max_requesters;
+ int requester_count;
+ u8 tag_map[IOAT_TAG_MAP_LEN];
+ struct ioat_dca_slot req_slots[];
+};
+
+static int ioat_dca_dev_managed(struct dca_provider *dca,
+ struct device *dev)
+{
+ struct ioat_dca_priv *ioatdca = dca_priv(dca);
+ struct pci_dev *pdev;
+ int i;
+
+ pdev = to_pci_dev(dev);
+ for (i = 0; i < ioatdca->max_requesters; i++) {
+ if (ioatdca->req_slots[i].pdev == pdev)
+ return 1;
+ }
+ return 0;
+}
+
+static int ioat_dca_add_requester(struct dca_provider *dca, struct device *dev)
+{
+ struct ioat_dca_priv *ioatdca = dca_priv(dca);
+ struct pci_dev *pdev;
+ int i;
+ u16 id;
+ u16 global_req_table;
+
+ /* This implementation only supports PCI-Express */
+ if (!dev_is_pci(dev))
+ return -ENODEV;
+ pdev = to_pci_dev(dev);
+ id = dcaid_from_pcidev(pdev);
+
+ if (ioatdca->requester_count == ioatdca->max_requesters)
+ return -ENODEV;
+
+ for (i = 0; i < ioatdca->max_requesters; i++) {
+ if (ioatdca->req_slots[i].pdev == NULL) {
+ /* found an empty slot */
+ ioatdca->requester_count++;
+ ioatdca->req_slots[i].pdev = pdev;
+ ioatdca->req_slots[i].rid = id;
+ global_req_table =
+ readw(ioatdca->dca_base + IOAT3_DCA_GREQID_OFFSET);
+ writel(id | IOAT_DCA_GREQID_VALID,
+ ioatdca->iobase + global_req_table + (i * 4));
+ return i;
+ }
+ }
+ /* Error, ioatdma->requester_count is out of whack */
+ return -EFAULT;
+}
+
+static int ioat_dca_remove_requester(struct dca_provider *dca,
+ struct device *dev)
+{
+ struct ioat_dca_priv *ioatdca = dca_priv(dca);
+ struct pci_dev *pdev;
+ int i;
+ u16 global_req_table;
+
+ /* This implementation only supports PCI-Express */
+ if (!dev_is_pci(dev))
+ return -ENODEV;
+ pdev = to_pci_dev(dev);
+
+ for (i = 0; i < ioatdca->max_requesters; i++) {
+ if (ioatdca->req_slots[i].pdev == pdev) {
+ global_req_table =
+ readw(ioatdca->dca_base + IOAT3_DCA_GREQID_OFFSET);
+ writel(0, ioatdca->iobase + global_req_table + (i * 4));
+ ioatdca->req_slots[i].pdev = NULL;
+ ioatdca->req_slots[i].rid = 0;
+ ioatdca->requester_count--;
+ return i;
+ }
+ }
+ return -ENODEV;
+}
+
+static u8 ioat_dca_get_tag(struct dca_provider *dca,
+ struct device *dev,
+ int cpu)
+{
+ u8 tag;
+
+ struct ioat_dca_priv *ioatdca = dca_priv(dca);
+ int i, apic_id, bit, value;
+ u8 entry;
+
+ tag = 0;
+ apic_id = cpu_physical_id(cpu);
+
+ for (i = 0; i < IOAT_TAG_MAP_LEN; i++) {
+ entry = ioatdca->tag_map[i];
+ if (entry & DCA3_TAG_MAP_BIT_TO_SEL) {
+ bit = entry &
+ ~(DCA3_TAG_MAP_BIT_TO_SEL | DCA3_TAG_MAP_BIT_TO_INV);
+ value = (apic_id & (1 << bit)) ? 1 : 0;
+ } else if (entry & DCA3_TAG_MAP_BIT_TO_INV) {
+ bit = entry & ~DCA3_TAG_MAP_BIT_TO_INV;
+ value = (apic_id & (1 << bit)) ? 0 : 1;
+ } else {
+ value = (entry & DCA3_TAG_MAP_LITERAL_VAL) ? 1 : 0;
+ }
+ tag |= (value << i);
+ }
+
+ return tag;
+}
+
+static const struct dca_ops ioat_dca_ops = {
+ .add_requester = ioat_dca_add_requester,
+ .remove_requester = ioat_dca_remove_requester,
+ .get_tag = ioat_dca_get_tag,
+ .dev_managed = ioat_dca_dev_managed,
+};
+
+static int ioat_dca_count_dca_slots(void *iobase, u16 dca_offset)
+{
+ int slots = 0;
+ u32 req;
+ u16 global_req_table;
+
+ global_req_table = readw(iobase + dca_offset + IOAT3_DCA_GREQID_OFFSET);
+ if (global_req_table == 0)
+ return 0;
+
+ do {
+ req = readl(iobase + global_req_table + (slots * sizeof(u32)));
+ slots++;
+ } while ((req & IOAT_DCA_GREQID_LASTID) == 0);
+
+ return slots;
+}
+
+static inline int dca3_tag_map_invalid(u8 *tag_map)
+{
+ /*
+ * If the tag map is not programmed by the BIOS the default is:
+ * 0x80 0x80 0x80 0x80 0x80 0x00 0x00 0x00
+ *
+ * This an invalid map and will result in only 2 possible tags
+ * 0x1F and 0x00. 0x00 is an invalid DCA tag so we know that
+ * this entire definition is invalid.
+ */
+ return ((tag_map[0] == DCA_TAG_MAP_VALID) &&
+ (tag_map[1] == DCA_TAG_MAP_VALID) &&
+ (tag_map[2] == DCA_TAG_MAP_VALID) &&
+ (tag_map[3] == DCA_TAG_MAP_VALID) &&
+ (tag_map[4] == DCA_TAG_MAP_VALID));
+}
+
+struct dca_provider *ioat_dca_init(struct pci_dev *pdev, void __iomem *iobase)
+{
+ struct dca_provider *dca;
+ struct ioat_dca_priv *ioatdca;
+ int slots;
+ int i;
+ int err;
+ u16 dca_offset;
+ u16 csi_fsb_control;
+ u16 pcie_control;
+ u8 bit;
+
+ union {
+ u64 full;
+ struct {
+ u32 low;
+ u32 high;
+ };
+ } tag_map;
+
+ if (!system_has_dca_enabled(pdev))
+ return NULL;
+
+ dca_offset = readw(iobase + IOAT_DCAOFFSET_OFFSET);
+ if (dca_offset == 0)
+ return NULL;
+
+ slots = ioat_dca_count_dca_slots(iobase, dca_offset);
+ if (slots == 0)
+ return NULL;
+
+ dca = alloc_dca_provider(&ioat_dca_ops,
+ struct_size(ioatdca, req_slots, slots));
+ if (!dca)
+ return NULL;
+
+ ioatdca = dca_priv(dca);
+ ioatdca->iobase = iobase;
+ ioatdca->dca_base = iobase + dca_offset;
+ ioatdca->max_requesters = slots;
+
+ /* some bios might not know to turn these on */
+ csi_fsb_control = readw(ioatdca->dca_base + IOAT3_CSI_CONTROL_OFFSET);
+ if ((csi_fsb_control & IOAT3_CSI_CONTROL_PREFETCH) == 0) {
+ csi_fsb_control |= IOAT3_CSI_CONTROL_PREFETCH;
+ writew(csi_fsb_control,
+ ioatdca->dca_base + IOAT3_CSI_CONTROL_OFFSET);
+ }
+ pcie_control = readw(ioatdca->dca_base + IOAT3_PCI_CONTROL_OFFSET);
+ if ((pcie_control & IOAT3_PCI_CONTROL_MEMWR) == 0) {
+ pcie_control |= IOAT3_PCI_CONTROL_MEMWR;
+ writew(pcie_control,
+ ioatdca->dca_base + IOAT3_PCI_CONTROL_OFFSET);
+ }
+
+
+ /* TODO version, compatibility and configuration checks */
+
+ /* copy out the APIC to DCA tag map */
+ tag_map.low =
+ readl(ioatdca->dca_base + IOAT3_APICID_TAG_MAP_OFFSET_LOW);
+ tag_map.high =
+ readl(ioatdca->dca_base + IOAT3_APICID_TAG_MAP_OFFSET_HIGH);
+ for (i = 0; i < 8; i++) {
+ bit = tag_map.full >> (8 * i);
+ ioatdca->tag_map[i] = bit & DCA_TAG_MAP_MASK;
+ }
+
+ if (dca3_tag_map_invalid(ioatdca->tag_map)) {
+ add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
+ pr_warn_once("%s %s: APICID_TAG_MAP set incorrectly by BIOS, disabling DCA\n",
+ dev_driver_string(&pdev->dev),
+ dev_name(&pdev->dev));
+ free_dca_provider(dca);
+ return NULL;
+ }
+
+ err = register_dca_provider(dca, &pdev->dev);
+ if (err) {
+ free_dca_provider(dca);
+ return NULL;
+ }
+
+ return dca;
+}
diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c
new file mode 100644
index 000000000..e2070df6c
--- /dev/null
+++ b/drivers/dma/ioat/dma.c
@@ -0,0 +1,1061 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Intel I/OAT DMA Linux driver
+ * Copyright(c) 2004 - 2015 Intel Corporation.
+ */
+
+/*
+ * This driver supports an Intel I/OAT DMA engine, which does asynchronous
+ * copy operations.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/pci.h>
+#include <linux/interrupt.h>
+#include <linux/dmaengine.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/workqueue.h>
+#include <linux/prefetch.h>
+#include <linux/sizes.h>
+#include "dma.h"
+#include "registers.h"
+#include "hw.h"
+
+#include "../dmaengine.h"
+
+static int completion_timeout = 200;
+module_param(completion_timeout, int, 0644);
+MODULE_PARM_DESC(completion_timeout,
+ "set ioat completion timeout [msec] (default 200 [msec])");
+static int idle_timeout = 2000;
+module_param(idle_timeout, int, 0644);
+MODULE_PARM_DESC(idle_timeout,
+ "set ioat idel timeout [msec] (default 2000 [msec])");
+
+#define IDLE_TIMEOUT msecs_to_jiffies(idle_timeout)
+#define COMPLETION_TIMEOUT msecs_to_jiffies(completion_timeout)
+
+static char *chanerr_str[] = {
+ "DMA Transfer Source Address Error",
+ "DMA Transfer Destination Address Error",
+ "Next Descriptor Address Error",
+ "Descriptor Error",
+ "Chan Address Value Error",
+ "CHANCMD Error",
+ "Chipset Uncorrectable Data Integrity Error",
+ "DMA Uncorrectable Data Integrity Error",
+ "Read Data Error",
+ "Write Data Error",
+ "Descriptor Control Error",
+ "Descriptor Transfer Size Error",
+ "Completion Address Error",
+ "Interrupt Configuration Error",
+ "Super extended descriptor Address Error",
+ "Unaffiliated Error",
+ "CRC or XOR P Error",
+ "XOR Q Error",
+ "Descriptor Count Error",
+ "DIF All F detect Error",
+ "Guard Tag verification Error",
+ "Application Tag verification Error",
+ "Reference Tag verification Error",
+ "Bundle Bit Error",
+ "Result DIF All F detect Error",
+ "Result Guard Tag verification Error",
+ "Result Application Tag verification Error",
+ "Result Reference Tag verification Error",
+};
+
+static void ioat_eh(struct ioatdma_chan *ioat_chan);
+
+static void ioat_print_chanerrs(struct ioatdma_chan *ioat_chan, u32 chanerr)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(chanerr_str); i++) {
+ if ((chanerr >> i) & 1) {
+ dev_err(to_dev(ioat_chan), "Err(%d): %s\n",
+ i, chanerr_str[i]);
+ }
+ }
+}
+
+/**
+ * ioat_dma_do_interrupt - handler used for single vector interrupt mode
+ * @irq: interrupt id
+ * @data: interrupt data
+ */
+irqreturn_t ioat_dma_do_interrupt(int irq, void *data)
+{
+ struct ioatdma_device *instance = data;
+ struct ioatdma_chan *ioat_chan;
+ unsigned long attnstatus;
+ int bit;
+ u8 intrctrl;
+
+ intrctrl = readb(instance->reg_base + IOAT_INTRCTRL_OFFSET);
+
+ if (!(intrctrl & IOAT_INTRCTRL_MASTER_INT_EN))
+ return IRQ_NONE;
+
+ if (!(intrctrl & IOAT_INTRCTRL_INT_STATUS)) {
+ writeb(intrctrl, instance->reg_base + IOAT_INTRCTRL_OFFSET);
+ return IRQ_NONE;
+ }
+
+ attnstatus = readl(instance->reg_base + IOAT_ATTNSTATUS_OFFSET);
+ for_each_set_bit(bit, &attnstatus, BITS_PER_LONG) {
+ ioat_chan = ioat_chan_by_index(instance, bit);
+ if (test_bit(IOAT_RUN, &ioat_chan->state))
+ tasklet_schedule(&ioat_chan->cleanup_task);
+ }
+
+ writeb(intrctrl, instance->reg_base + IOAT_INTRCTRL_OFFSET);
+ return IRQ_HANDLED;
+}
+
+/**
+ * ioat_dma_do_interrupt_msix - handler used for vector-per-channel interrupt mode
+ * @irq: interrupt id
+ * @data: interrupt data
+ */
+irqreturn_t ioat_dma_do_interrupt_msix(int irq, void *data)
+{
+ struct ioatdma_chan *ioat_chan = data;
+
+ if (test_bit(IOAT_RUN, &ioat_chan->state))
+ tasklet_schedule(&ioat_chan->cleanup_task);
+
+ return IRQ_HANDLED;
+}
+
+void ioat_stop(struct ioatdma_chan *ioat_chan)
+{
+ struct ioatdma_device *ioat_dma = ioat_chan->ioat_dma;
+ struct pci_dev *pdev = ioat_dma->pdev;
+ int chan_id = chan_num(ioat_chan);
+ struct msix_entry *msix;
+
+ /* 1/ stop irq from firing tasklets
+ * 2/ stop the tasklet from re-arming irqs
+ */
+ clear_bit(IOAT_RUN, &ioat_chan->state);
+
+ /* flush inflight interrupts */
+ switch (ioat_dma->irq_mode) {
+ case IOAT_MSIX:
+ msix = &ioat_dma->msix_entries[chan_id];
+ synchronize_irq(msix->vector);
+ break;
+ case IOAT_MSI:
+ case IOAT_INTX:
+ synchronize_irq(pdev->irq);
+ break;
+ default:
+ break;
+ }
+
+ /* flush inflight timers */
+ del_timer_sync(&ioat_chan->timer);
+
+ /* flush inflight tasklet runs */
+ tasklet_kill(&ioat_chan->cleanup_task);
+
+ /* final cleanup now that everything is quiesced and can't re-arm */
+ ioat_cleanup_event(&ioat_chan->cleanup_task);
+}
+
+static void __ioat_issue_pending(struct ioatdma_chan *ioat_chan)
+{
+ ioat_chan->dmacount += ioat_ring_pending(ioat_chan);
+ ioat_chan->issued = ioat_chan->head;
+ writew(ioat_chan->dmacount,
+ ioat_chan->reg_base + IOAT_CHAN_DMACOUNT_OFFSET);
+ dev_dbg(to_dev(ioat_chan),
+ "%s: head: %#x tail: %#x issued: %#x count: %#x\n",
+ __func__, ioat_chan->head, ioat_chan->tail,
+ ioat_chan->issued, ioat_chan->dmacount);
+}
+
+void ioat_issue_pending(struct dma_chan *c)
+{
+ struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
+
+ if (ioat_ring_pending(ioat_chan)) {
+ spin_lock_bh(&ioat_chan->prep_lock);
+ __ioat_issue_pending(ioat_chan);
+ spin_unlock_bh(&ioat_chan->prep_lock);
+ }
+}
+
+/**
+ * ioat_update_pending - log pending descriptors
+ * @ioat_chan: ioat+ channel
+ *
+ * Check if the number of unsubmitted descriptors has exceeded the
+ * watermark. Called with prep_lock held
+ */
+static void ioat_update_pending(struct ioatdma_chan *ioat_chan)
+{
+ if (ioat_ring_pending(ioat_chan) > ioat_pending_level)
+ __ioat_issue_pending(ioat_chan);
+}
+
+static void __ioat_start_null_desc(struct ioatdma_chan *ioat_chan)
+{
+ struct ioat_ring_ent *desc;
+ struct ioat_dma_descriptor *hw;
+
+ if (ioat_ring_space(ioat_chan) < 1) {
+ dev_err(to_dev(ioat_chan),
+ "Unable to start null desc - ring full\n");
+ return;
+ }
+
+ dev_dbg(to_dev(ioat_chan),
+ "%s: head: %#x tail: %#x issued: %#x\n",
+ __func__, ioat_chan->head, ioat_chan->tail, ioat_chan->issued);
+ desc = ioat_get_ring_ent(ioat_chan, ioat_chan->head);
+
+ hw = desc->hw;
+ hw->ctl = 0;
+ hw->ctl_f.null = 1;
+ hw->ctl_f.int_en = 1;
+ hw->ctl_f.compl_write = 1;
+ /* set size to non-zero value (channel returns error when size is 0) */
+ hw->size = NULL_DESC_BUFFER_SIZE;
+ hw->src_addr = 0;
+ hw->dst_addr = 0;
+ async_tx_ack(&desc->txd);
+ ioat_set_chainaddr(ioat_chan, desc->txd.phys);
+ dump_desc_dbg(ioat_chan, desc);
+ /* make sure descriptors are written before we submit */
+ wmb();
+ ioat_chan->head += 1;
+ __ioat_issue_pending(ioat_chan);
+}
+
+void ioat_start_null_desc(struct ioatdma_chan *ioat_chan)
+{
+ spin_lock_bh(&ioat_chan->prep_lock);
+ if (!test_bit(IOAT_CHAN_DOWN, &ioat_chan->state))
+ __ioat_start_null_desc(ioat_chan);
+ spin_unlock_bh(&ioat_chan->prep_lock);
+}
+
+static void __ioat_restart_chan(struct ioatdma_chan *ioat_chan)
+{
+ /* set the tail to be re-issued */
+ ioat_chan->issued = ioat_chan->tail;
+ ioat_chan->dmacount = 0;
+ mod_timer(&ioat_chan->timer, jiffies + COMPLETION_TIMEOUT);
+
+ dev_dbg(to_dev(ioat_chan),
+ "%s: head: %#x tail: %#x issued: %#x count: %#x\n",
+ __func__, ioat_chan->head, ioat_chan->tail,
+ ioat_chan->issued, ioat_chan->dmacount);
+
+ if (ioat_ring_pending(ioat_chan)) {
+ struct ioat_ring_ent *desc;
+
+ desc = ioat_get_ring_ent(ioat_chan, ioat_chan->tail);
+ ioat_set_chainaddr(ioat_chan, desc->txd.phys);
+ __ioat_issue_pending(ioat_chan);
+ } else
+ __ioat_start_null_desc(ioat_chan);
+}
+
+static int ioat_quiesce(struct ioatdma_chan *ioat_chan, unsigned long tmo)
+{
+ unsigned long end = jiffies + tmo;
+ int err = 0;
+ u32 status;
+
+ status = ioat_chansts(ioat_chan);
+ if (is_ioat_active(status) || is_ioat_idle(status))
+ ioat_suspend(ioat_chan);
+ while (is_ioat_active(status) || is_ioat_idle(status)) {
+ if (tmo && time_after(jiffies, end)) {
+ err = -ETIMEDOUT;
+ break;
+ }
+ status = ioat_chansts(ioat_chan);
+ cpu_relax();
+ }
+
+ return err;
+}
+
+static int ioat_reset_sync(struct ioatdma_chan *ioat_chan, unsigned long tmo)
+{
+ unsigned long end = jiffies + tmo;
+ int err = 0;
+
+ ioat_reset(ioat_chan);
+ while (ioat_reset_pending(ioat_chan)) {
+ if (end && time_after(jiffies, end)) {
+ err = -ETIMEDOUT;
+ break;
+ }
+ cpu_relax();
+ }
+
+ return err;
+}
+
+static dma_cookie_t ioat_tx_submit_unlock(struct dma_async_tx_descriptor *tx)
+ __releases(&ioat_chan->prep_lock)
+{
+ struct dma_chan *c = tx->chan;
+ struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
+ dma_cookie_t cookie;
+
+ cookie = dma_cookie_assign(tx);
+ dev_dbg(to_dev(ioat_chan), "%s: cookie: %d\n", __func__, cookie);
+
+ if (!test_and_set_bit(IOAT_CHAN_ACTIVE, &ioat_chan->state))
+ mod_timer(&ioat_chan->timer, jiffies + COMPLETION_TIMEOUT);
+
+ /* make descriptor updates visible before advancing ioat->head,
+ * this is purposefully not smp_wmb() since we are also
+ * publishing the descriptor updates to a dma device
+ */
+ wmb();
+
+ ioat_chan->head += ioat_chan->produce;
+
+ ioat_update_pending(ioat_chan);
+ spin_unlock_bh(&ioat_chan->prep_lock);
+
+ return cookie;
+}
+
+static struct ioat_ring_ent *
+ioat_alloc_ring_ent(struct dma_chan *chan, int idx, gfp_t flags)
+{
+ struct ioat_dma_descriptor *hw;
+ struct ioat_ring_ent *desc;
+ struct ioatdma_chan *ioat_chan = to_ioat_chan(chan);
+ int chunk;
+ dma_addr_t phys;
+ u8 *pos;
+ off_t offs;
+
+ chunk = idx / IOAT_DESCS_PER_CHUNK;
+ idx &= (IOAT_DESCS_PER_CHUNK - 1);
+ offs = idx * IOAT_DESC_SZ;
+ pos = (u8 *)ioat_chan->descs[chunk].virt + offs;
+ phys = ioat_chan->descs[chunk].hw + offs;
+ hw = (struct ioat_dma_descriptor *)pos;
+ memset(hw, 0, sizeof(*hw));
+
+ desc = kmem_cache_zalloc(ioat_cache, flags);
+ if (!desc)
+ return NULL;
+
+ dma_async_tx_descriptor_init(&desc->txd, chan);
+ desc->txd.tx_submit = ioat_tx_submit_unlock;
+ desc->hw = hw;
+ desc->txd.phys = phys;
+ return desc;
+}
+
+void ioat_free_ring_ent(struct ioat_ring_ent *desc, struct dma_chan *chan)
+{
+ kmem_cache_free(ioat_cache, desc);
+}
+
+struct ioat_ring_ent **
+ioat_alloc_ring(struct dma_chan *c, int order, gfp_t flags)
+{
+ struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
+ struct ioatdma_device *ioat_dma = ioat_chan->ioat_dma;
+ struct ioat_ring_ent **ring;
+ int total_descs = 1 << order;
+ int i, chunks;
+
+ /* allocate the array to hold the software ring */
+ ring = kcalloc(total_descs, sizeof(*ring), flags);
+ if (!ring)
+ return NULL;
+
+ chunks = (total_descs * IOAT_DESC_SZ) / IOAT_CHUNK_SIZE;
+ ioat_chan->desc_chunks = chunks;
+
+ for (i = 0; i < chunks; i++) {
+ struct ioat_descs *descs = &ioat_chan->descs[i];
+
+ descs->virt = dma_alloc_coherent(to_dev(ioat_chan),
+ IOAT_CHUNK_SIZE, &descs->hw, flags);
+ if (!descs->virt) {
+ int idx;
+
+ for (idx = 0; idx < i; idx++) {
+ descs = &ioat_chan->descs[idx];
+ dma_free_coherent(to_dev(ioat_chan),
+ IOAT_CHUNK_SIZE,
+ descs->virt, descs->hw);
+ descs->virt = NULL;
+ descs->hw = 0;
+ }
+
+ ioat_chan->desc_chunks = 0;
+ kfree(ring);
+ return NULL;
+ }
+ }
+
+ for (i = 0; i < total_descs; i++) {
+ ring[i] = ioat_alloc_ring_ent(c, i, flags);
+ if (!ring[i]) {
+ int idx;
+
+ while (i--)
+ ioat_free_ring_ent(ring[i], c);
+
+ for (idx = 0; idx < ioat_chan->desc_chunks; idx++) {
+ dma_free_coherent(to_dev(ioat_chan),
+ IOAT_CHUNK_SIZE,
+ ioat_chan->descs[idx].virt,
+ ioat_chan->descs[idx].hw);
+ ioat_chan->descs[idx].virt = NULL;
+ ioat_chan->descs[idx].hw = 0;
+ }
+
+ ioat_chan->desc_chunks = 0;
+ kfree(ring);
+ return NULL;
+ }
+ set_desc_id(ring[i], i);
+ }
+
+ /* link descs */
+ for (i = 0; i < total_descs-1; i++) {
+ struct ioat_ring_ent *next = ring[i+1];
+ struct ioat_dma_descriptor *hw = ring[i]->hw;
+
+ hw->next = next->txd.phys;
+ }
+ ring[i]->hw->next = ring[0]->txd.phys;
+
+ /* setup descriptor pre-fetching for v3.4 */
+ if (ioat_dma->cap & IOAT_CAP_DPS) {
+ u16 drsctl = IOAT_CHAN_DRSZ_2MB | IOAT_CHAN_DRS_EN;
+
+ if (chunks == 1)
+ drsctl |= IOAT_CHAN_DRS_AUTOWRAP;
+
+ writew(drsctl, ioat_chan->reg_base + IOAT_CHAN_DRSCTL_OFFSET);
+
+ }
+
+ return ring;
+}
+
+/**
+ * ioat_check_space_lock - verify space and grab ring producer lock
+ * @ioat_chan: ioat,3 channel (ring) to operate on
+ * @num_descs: allocation length
+ */
+int ioat_check_space_lock(struct ioatdma_chan *ioat_chan, int num_descs)
+ __acquires(&ioat_chan->prep_lock)
+{
+ spin_lock_bh(&ioat_chan->prep_lock);
+ /* never allow the last descriptor to be consumed, we need at
+ * least one free at all times to allow for on-the-fly ring
+ * resizing.
+ */
+ if (likely(ioat_ring_space(ioat_chan) > num_descs)) {
+ dev_dbg(to_dev(ioat_chan), "%s: num_descs: %d (%x:%x:%x)\n",
+ __func__, num_descs, ioat_chan->head,
+ ioat_chan->tail, ioat_chan->issued);
+ ioat_chan->produce = num_descs;
+ return 0; /* with ioat->prep_lock held */
+ }
+ spin_unlock_bh(&ioat_chan->prep_lock);
+
+ dev_dbg_ratelimited(to_dev(ioat_chan),
+ "%s: ring full! num_descs: %d (%x:%x:%x)\n",
+ __func__, num_descs, ioat_chan->head,
+ ioat_chan->tail, ioat_chan->issued);
+
+ /* progress reclaim in the allocation failure case we may be
+ * called under bh_disabled so we need to trigger the timer
+ * event directly
+ */
+ if (time_is_before_jiffies(ioat_chan->timer.expires)
+ && timer_pending(&ioat_chan->timer)) {
+ mod_timer(&ioat_chan->timer, jiffies + COMPLETION_TIMEOUT);
+ ioat_timer_event(&ioat_chan->timer);
+ }
+
+ return -ENOMEM;
+}
+
+static bool desc_has_ext(struct ioat_ring_ent *desc)
+{
+ struct ioat_dma_descriptor *hw = desc->hw;
+
+ if (hw->ctl_f.op == IOAT_OP_XOR ||
+ hw->ctl_f.op == IOAT_OP_XOR_VAL) {
+ struct ioat_xor_descriptor *xor = desc->xor;
+
+ if (src_cnt_to_sw(xor->ctl_f.src_cnt) > 5)
+ return true;
+ } else if (hw->ctl_f.op == IOAT_OP_PQ ||
+ hw->ctl_f.op == IOAT_OP_PQ_VAL) {
+ struct ioat_pq_descriptor *pq = desc->pq;
+
+ if (src_cnt_to_sw(pq->ctl_f.src_cnt) > 3)
+ return true;
+ }
+
+ return false;
+}
+
+static void
+ioat_free_sed(struct ioatdma_device *ioat_dma, struct ioat_sed_ent *sed)
+{
+ if (!sed)
+ return;
+
+ dma_pool_free(ioat_dma->sed_hw_pool[sed->hw_pool], sed->hw, sed->dma);
+ kmem_cache_free(ioat_sed_cache, sed);
+}
+
+static u64 ioat_get_current_completion(struct ioatdma_chan *ioat_chan)
+{
+ u64 phys_complete;
+ u64 completion;
+
+ completion = *ioat_chan->completion;
+ phys_complete = ioat_chansts_to_addr(completion);
+
+ dev_dbg(to_dev(ioat_chan), "%s: phys_complete: %#llx\n", __func__,
+ (unsigned long long) phys_complete);
+
+ return phys_complete;
+}
+
+static bool ioat_cleanup_preamble(struct ioatdma_chan *ioat_chan,
+ u64 *phys_complete)
+{
+ *phys_complete = ioat_get_current_completion(ioat_chan);
+ if (*phys_complete == ioat_chan->last_completion)
+ return false;
+
+ clear_bit(IOAT_COMPLETION_ACK, &ioat_chan->state);
+ mod_timer(&ioat_chan->timer, jiffies + COMPLETION_TIMEOUT);
+
+ return true;
+}
+
+static void
+desc_get_errstat(struct ioatdma_chan *ioat_chan, struct ioat_ring_ent *desc)
+{
+ struct ioat_dma_descriptor *hw = desc->hw;
+
+ switch (hw->ctl_f.op) {
+ case IOAT_OP_PQ_VAL:
+ case IOAT_OP_PQ_VAL_16S:
+ {
+ struct ioat_pq_descriptor *pq = desc->pq;
+
+ /* check if there's error written */
+ if (!pq->dwbes_f.wbes)
+ return;
+
+ /* need to set a chanerr var for checking to clear later */
+
+ if (pq->dwbes_f.p_val_err)
+ *desc->result |= SUM_CHECK_P_RESULT;
+
+ if (pq->dwbes_f.q_val_err)
+ *desc->result |= SUM_CHECK_Q_RESULT;
+
+ return;
+ }
+ default:
+ return;
+ }
+}
+
+/**
+ * __cleanup - reclaim used descriptors
+ * @ioat_chan: channel (ring) to clean
+ * @phys_complete: zeroed (or not) completion address (from status)
+ */
+static void __cleanup(struct ioatdma_chan *ioat_chan, dma_addr_t phys_complete)
+{
+ struct ioatdma_device *ioat_dma = ioat_chan->ioat_dma;
+ struct ioat_ring_ent *desc;
+ bool seen_current = false;
+ int idx = ioat_chan->tail, i;
+ u16 active;
+
+ dev_dbg(to_dev(ioat_chan), "%s: head: %#x tail: %#x issued: %#x\n",
+ __func__, ioat_chan->head, ioat_chan->tail, ioat_chan->issued);
+
+ /*
+ * At restart of the channel, the completion address and the
+ * channel status will be 0 due to starting a new chain. Since
+ * it's new chain and the first descriptor "fails", there is
+ * nothing to clean up. We do not want to reap the entire submitted
+ * chain due to this 0 address value and then BUG.
+ */
+ if (!phys_complete)
+ return;
+
+ active = ioat_ring_active(ioat_chan);
+ for (i = 0; i < active && !seen_current; i++) {
+ struct dma_async_tx_descriptor *tx;
+
+ prefetch(ioat_get_ring_ent(ioat_chan, idx + i + 1));
+ desc = ioat_get_ring_ent(ioat_chan, idx + i);
+ dump_desc_dbg(ioat_chan, desc);
+
+ /* set err stat if we are using dwbes */
+ if (ioat_dma->cap & IOAT_CAP_DWBES)
+ desc_get_errstat(ioat_chan, desc);
+
+ tx = &desc->txd;
+ if (tx->cookie) {
+ dma_cookie_complete(tx);
+ dma_descriptor_unmap(tx);
+ dmaengine_desc_get_callback_invoke(tx, NULL);
+ tx->callback = NULL;
+ tx->callback_result = NULL;
+ }
+
+ if (tx->phys == phys_complete)
+ seen_current = true;
+
+ /* skip extended descriptors */
+ if (desc_has_ext(desc)) {
+ BUG_ON(i + 1 >= active);
+ i++;
+ }
+
+ /* cleanup super extended descriptors */
+ if (desc->sed) {
+ ioat_free_sed(ioat_dma, desc->sed);
+ desc->sed = NULL;
+ }
+ }
+
+ /* finish all descriptor reads before incrementing tail */
+ smp_mb();
+ ioat_chan->tail = idx + i;
+ /* no active descs have written a completion? */
+ BUG_ON(active && !seen_current);
+ ioat_chan->last_completion = phys_complete;
+
+ if (active - i == 0) {
+ dev_dbg(to_dev(ioat_chan), "%s: cancel completion timeout\n",
+ __func__);
+ mod_timer_pending(&ioat_chan->timer, jiffies + IDLE_TIMEOUT);
+ }
+
+ /* microsecond delay by sysfs variable per pending descriptor */
+ if (ioat_chan->intr_coalesce != ioat_chan->prev_intr_coalesce) {
+ writew(min((ioat_chan->intr_coalesce * (active - i)),
+ IOAT_INTRDELAY_MASK),
+ ioat_chan->ioat_dma->reg_base + IOAT_INTRDELAY_OFFSET);
+ ioat_chan->prev_intr_coalesce = ioat_chan->intr_coalesce;
+ }
+}
+
+static void ioat_cleanup(struct ioatdma_chan *ioat_chan)
+{
+ u64 phys_complete;
+
+ spin_lock_bh(&ioat_chan->cleanup_lock);
+
+ if (ioat_cleanup_preamble(ioat_chan, &phys_complete))
+ __cleanup(ioat_chan, phys_complete);
+
+ if (is_ioat_halted(*ioat_chan->completion)) {
+ u32 chanerr = readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
+
+ if (chanerr &
+ (IOAT_CHANERR_HANDLE_MASK | IOAT_CHANERR_RECOVER_MASK)) {
+ mod_timer_pending(&ioat_chan->timer, jiffies + IDLE_TIMEOUT);
+ ioat_eh(ioat_chan);
+ }
+ }
+
+ spin_unlock_bh(&ioat_chan->cleanup_lock);
+}
+
+void ioat_cleanup_event(struct tasklet_struct *t)
+{
+ struct ioatdma_chan *ioat_chan = from_tasklet(ioat_chan, t, cleanup_task);
+
+ ioat_cleanup(ioat_chan);
+ if (!test_bit(IOAT_RUN, &ioat_chan->state))
+ return;
+ writew(IOAT_CHANCTRL_RUN, ioat_chan->reg_base + IOAT_CHANCTRL_OFFSET);
+}
+
+static void ioat_restart_channel(struct ioatdma_chan *ioat_chan)
+{
+ u64 phys_complete;
+
+ /* set the completion address register again */
+ writel(lower_32_bits(ioat_chan->completion_dma),
+ ioat_chan->reg_base + IOAT_CHANCMP_OFFSET_LOW);
+ writel(upper_32_bits(ioat_chan->completion_dma),
+ ioat_chan->reg_base + IOAT_CHANCMP_OFFSET_HIGH);
+
+ ioat_quiesce(ioat_chan, 0);
+ if (ioat_cleanup_preamble(ioat_chan, &phys_complete))
+ __cleanup(ioat_chan, phys_complete);
+
+ __ioat_restart_chan(ioat_chan);
+}
+
+
+static void ioat_abort_descs(struct ioatdma_chan *ioat_chan)
+{
+ struct ioatdma_device *ioat_dma = ioat_chan->ioat_dma;
+ struct ioat_ring_ent *desc;
+ u16 active;
+ int idx = ioat_chan->tail, i;
+
+ /*
+ * We assume that the failed descriptor has been processed.
+ * Now we are just returning all the remaining submitted
+ * descriptors to abort.
+ */
+ active = ioat_ring_active(ioat_chan);
+
+ /* we skip the failed descriptor that tail points to */
+ for (i = 1; i < active; i++) {
+ struct dma_async_tx_descriptor *tx;
+
+ prefetch(ioat_get_ring_ent(ioat_chan, idx + i + 1));
+ desc = ioat_get_ring_ent(ioat_chan, idx + i);
+
+ tx = &desc->txd;
+ if (tx->cookie) {
+ struct dmaengine_result res;
+
+ dma_cookie_complete(tx);
+ dma_descriptor_unmap(tx);
+ res.result = DMA_TRANS_ABORTED;
+ dmaengine_desc_get_callback_invoke(tx, &res);
+ tx->callback = NULL;
+ tx->callback_result = NULL;
+ }
+
+ /* skip extended descriptors */
+ if (desc_has_ext(desc)) {
+ WARN_ON(i + 1 >= active);
+ i++;
+ }
+
+ /* cleanup super extended descriptors */
+ if (desc->sed) {
+ ioat_free_sed(ioat_dma, desc->sed);
+ desc->sed = NULL;
+ }
+ }
+
+ smp_mb(); /* finish all descriptor reads before incrementing tail */
+ ioat_chan->tail = idx + active;
+
+ desc = ioat_get_ring_ent(ioat_chan, ioat_chan->tail);
+ ioat_chan->last_completion = *ioat_chan->completion = desc->txd.phys;
+}
+
+static void ioat_eh(struct ioatdma_chan *ioat_chan)
+{
+ struct pci_dev *pdev = to_pdev(ioat_chan);
+ struct ioat_dma_descriptor *hw;
+ struct dma_async_tx_descriptor *tx;
+ u64 phys_complete;
+ struct ioat_ring_ent *desc;
+ u32 err_handled = 0;
+ u32 chanerr_int;
+ u32 chanerr;
+ bool abort = false;
+ struct dmaengine_result res;
+
+ /* cleanup so tail points to descriptor that caused the error */
+ if (ioat_cleanup_preamble(ioat_chan, &phys_complete))
+ __cleanup(ioat_chan, phys_complete);
+
+ chanerr = readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
+ pci_read_config_dword(pdev, IOAT_PCI_CHANERR_INT_OFFSET, &chanerr_int);
+
+ dev_dbg(to_dev(ioat_chan), "%s: error = %x:%x\n",
+ __func__, chanerr, chanerr_int);
+
+ desc = ioat_get_ring_ent(ioat_chan, ioat_chan->tail);
+ hw = desc->hw;
+ dump_desc_dbg(ioat_chan, desc);
+
+ switch (hw->ctl_f.op) {
+ case IOAT_OP_XOR_VAL:
+ if (chanerr & IOAT_CHANERR_XOR_P_OR_CRC_ERR) {
+ *desc->result |= SUM_CHECK_P_RESULT;
+ err_handled |= IOAT_CHANERR_XOR_P_OR_CRC_ERR;
+ }
+ break;
+ case IOAT_OP_PQ_VAL:
+ case IOAT_OP_PQ_VAL_16S:
+ if (chanerr & IOAT_CHANERR_XOR_P_OR_CRC_ERR) {
+ *desc->result |= SUM_CHECK_P_RESULT;
+ err_handled |= IOAT_CHANERR_XOR_P_OR_CRC_ERR;
+ }
+ if (chanerr & IOAT_CHANERR_XOR_Q_ERR) {
+ *desc->result |= SUM_CHECK_Q_RESULT;
+ err_handled |= IOAT_CHANERR_XOR_Q_ERR;
+ }
+ break;
+ }
+
+ if (chanerr & IOAT_CHANERR_RECOVER_MASK) {
+ if (chanerr & IOAT_CHANERR_READ_DATA_ERR) {
+ res.result = DMA_TRANS_READ_FAILED;
+ err_handled |= IOAT_CHANERR_READ_DATA_ERR;
+ } else if (chanerr & IOAT_CHANERR_WRITE_DATA_ERR) {
+ res.result = DMA_TRANS_WRITE_FAILED;
+ err_handled |= IOAT_CHANERR_WRITE_DATA_ERR;
+ }
+
+ abort = true;
+ } else
+ res.result = DMA_TRANS_NOERROR;
+
+ /* fault on unhandled error or spurious halt */
+ if (chanerr ^ err_handled || chanerr == 0) {
+ dev_err(to_dev(ioat_chan), "%s: fatal error (%x:%x)\n",
+ __func__, chanerr, err_handled);
+ dev_err(to_dev(ioat_chan), "Errors handled:\n");
+ ioat_print_chanerrs(ioat_chan, err_handled);
+ dev_err(to_dev(ioat_chan), "Errors not handled:\n");
+ ioat_print_chanerrs(ioat_chan, (chanerr & ~err_handled));
+
+ BUG();
+ }
+
+ /* cleanup the faulty descriptor since we are continuing */
+ tx = &desc->txd;
+ if (tx->cookie) {
+ dma_cookie_complete(tx);
+ dma_descriptor_unmap(tx);
+ dmaengine_desc_get_callback_invoke(tx, &res);
+ tx->callback = NULL;
+ tx->callback_result = NULL;
+ }
+
+ /* mark faulting descriptor as complete */
+ *ioat_chan->completion = desc->txd.phys;
+
+ spin_lock_bh(&ioat_chan->prep_lock);
+ /* we need abort all descriptors */
+ if (abort) {
+ ioat_abort_descs(ioat_chan);
+ /* clean up the channel, we could be in weird state */
+ ioat_reset_hw(ioat_chan);
+ }
+
+ writel(chanerr, ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
+ pci_write_config_dword(pdev, IOAT_PCI_CHANERR_INT_OFFSET, chanerr_int);
+
+ ioat_restart_channel(ioat_chan);
+ spin_unlock_bh(&ioat_chan->prep_lock);
+}
+
+static void check_active(struct ioatdma_chan *ioat_chan)
+{
+ if (ioat_ring_active(ioat_chan)) {
+ mod_timer(&ioat_chan->timer, jiffies + COMPLETION_TIMEOUT);
+ return;
+ }
+
+ if (test_and_clear_bit(IOAT_CHAN_ACTIVE, &ioat_chan->state))
+ mod_timer_pending(&ioat_chan->timer, jiffies + IDLE_TIMEOUT);
+}
+
+static void ioat_reboot_chan(struct ioatdma_chan *ioat_chan)
+{
+ spin_lock_bh(&ioat_chan->prep_lock);
+ set_bit(IOAT_CHAN_DOWN, &ioat_chan->state);
+ spin_unlock_bh(&ioat_chan->prep_lock);
+
+ ioat_abort_descs(ioat_chan);
+ dev_warn(to_dev(ioat_chan), "Reset channel...\n");
+ ioat_reset_hw(ioat_chan);
+ dev_warn(to_dev(ioat_chan), "Restart channel...\n");
+ ioat_restart_channel(ioat_chan);
+
+ spin_lock_bh(&ioat_chan->prep_lock);
+ clear_bit(IOAT_CHAN_DOWN, &ioat_chan->state);
+ spin_unlock_bh(&ioat_chan->prep_lock);
+}
+
+void ioat_timer_event(struct timer_list *t)
+{
+ struct ioatdma_chan *ioat_chan = from_timer(ioat_chan, t, timer);
+ dma_addr_t phys_complete;
+ u64 status;
+
+ status = ioat_chansts(ioat_chan);
+
+ /* when halted due to errors check for channel
+ * programming errors before advancing the completion state
+ */
+ if (is_ioat_halted(status)) {
+ u32 chanerr;
+
+ chanerr = readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
+ dev_err(to_dev(ioat_chan), "%s: Channel halted (%x)\n",
+ __func__, chanerr);
+ dev_err(to_dev(ioat_chan), "Errors:\n");
+ ioat_print_chanerrs(ioat_chan, chanerr);
+
+ if (test_bit(IOAT_RUN, &ioat_chan->state)) {
+ spin_lock_bh(&ioat_chan->cleanup_lock);
+ ioat_reboot_chan(ioat_chan);
+ spin_unlock_bh(&ioat_chan->cleanup_lock);
+ }
+
+ return;
+ }
+
+ spin_lock_bh(&ioat_chan->cleanup_lock);
+
+ /* handle the no-actives case */
+ if (!ioat_ring_active(ioat_chan)) {
+ spin_lock_bh(&ioat_chan->prep_lock);
+ check_active(ioat_chan);
+ spin_unlock_bh(&ioat_chan->prep_lock);
+ goto unlock_out;
+ }
+
+ /* handle the missed cleanup case */
+ if (ioat_cleanup_preamble(ioat_chan, &phys_complete)) {
+ /* timer restarted in ioat_cleanup_preamble
+ * and IOAT_COMPLETION_ACK cleared
+ */
+ __cleanup(ioat_chan, phys_complete);
+ goto unlock_out;
+ }
+
+ /* if we haven't made progress and we have already
+ * acknowledged a pending completion once, then be more
+ * forceful with a restart
+ */
+ if (test_bit(IOAT_COMPLETION_ACK, &ioat_chan->state)) {
+ u32 chanerr;
+
+ chanerr = readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
+ dev_err(to_dev(ioat_chan), "CHANSTS: %#Lx CHANERR: %#x\n",
+ status, chanerr);
+ dev_err(to_dev(ioat_chan), "Errors:\n");
+ ioat_print_chanerrs(ioat_chan, chanerr);
+
+ dev_dbg(to_dev(ioat_chan), "Active descriptors: %d\n",
+ ioat_ring_active(ioat_chan));
+
+ ioat_reboot_chan(ioat_chan);
+
+ goto unlock_out;
+ }
+
+ /* handle missed issue pending case */
+ if (ioat_ring_pending(ioat_chan)) {
+ dev_warn(to_dev(ioat_chan),
+ "Completion timeout with pending descriptors\n");
+ spin_lock_bh(&ioat_chan->prep_lock);
+ __ioat_issue_pending(ioat_chan);
+ spin_unlock_bh(&ioat_chan->prep_lock);
+ }
+
+ set_bit(IOAT_COMPLETION_ACK, &ioat_chan->state);
+ mod_timer(&ioat_chan->timer, jiffies + COMPLETION_TIMEOUT);
+unlock_out:
+ spin_unlock_bh(&ioat_chan->cleanup_lock);
+}
+
+enum dma_status
+ioat_tx_status(struct dma_chan *c, dma_cookie_t cookie,
+ struct dma_tx_state *txstate)
+{
+ struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
+ enum dma_status ret;
+
+ ret = dma_cookie_status(c, cookie, txstate);
+ if (ret == DMA_COMPLETE)
+ return ret;
+
+ ioat_cleanup(ioat_chan);
+
+ return dma_cookie_status(c, cookie, txstate);
+}
+
+int ioat_reset_hw(struct ioatdma_chan *ioat_chan)
+{
+ /* throw away whatever the channel was doing and get it
+ * initialized, with ioat3 specific workarounds
+ */
+ struct ioatdma_device *ioat_dma = ioat_chan->ioat_dma;
+ struct pci_dev *pdev = ioat_dma->pdev;
+ u32 chanerr;
+ u16 dev_id;
+ int err;
+
+ ioat_quiesce(ioat_chan, msecs_to_jiffies(100));
+
+ chanerr = readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
+ writel(chanerr, ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
+
+ if (ioat_dma->version < IOAT_VER_3_3) {
+ /* clear any pending errors */
+ err = pci_read_config_dword(pdev,
+ IOAT_PCI_CHANERR_INT_OFFSET, &chanerr);
+ if (err) {
+ dev_err(&pdev->dev,
+ "channel error register unreachable\n");
+ return err;
+ }
+ pci_write_config_dword(pdev,
+ IOAT_PCI_CHANERR_INT_OFFSET, chanerr);
+
+ /* Clear DMAUNCERRSTS Cfg-Reg Parity Error status bit
+ * (workaround for spurious config parity error after restart)
+ */
+ pci_read_config_word(pdev, IOAT_PCI_DEVICE_ID_OFFSET, &dev_id);
+ if (dev_id == PCI_DEVICE_ID_INTEL_IOAT_TBG0) {
+ pci_write_config_dword(pdev,
+ IOAT_PCI_DMAUNCERRSTS_OFFSET,
+ 0x10);
+ }
+ }
+
+ if (is_bwd_ioat(pdev) && (ioat_dma->irq_mode == IOAT_MSIX)) {
+ ioat_dma->msixtba0 = readq(ioat_dma->reg_base + 0x1000);
+ ioat_dma->msixdata0 = readq(ioat_dma->reg_base + 0x1008);
+ ioat_dma->msixpba = readq(ioat_dma->reg_base + 0x1800);
+ }
+
+
+ err = ioat_reset_sync(ioat_chan, msecs_to_jiffies(200));
+ if (!err) {
+ if (is_bwd_ioat(pdev) && (ioat_dma->irq_mode == IOAT_MSIX)) {
+ writeq(ioat_dma->msixtba0, ioat_dma->reg_base + 0x1000);
+ writeq(ioat_dma->msixdata0, ioat_dma->reg_base + 0x1008);
+ writeq(ioat_dma->msixpba, ioat_dma->reg_base + 0x1800);
+ }
+ }
+
+ if (err)
+ dev_err(&pdev->dev, "Failed to reset: %d\n", err);
+
+ return err;
+}
diff --git a/drivers/dma/ioat/dma.h b/drivers/dma/ioat/dma.h
new file mode 100644
index 000000000..35e06b382
--- /dev/null
+++ b/drivers/dma/ioat/dma.h
@@ -0,0 +1,406 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright(c) 2004 - 2009 Intel Corporation. All rights reserved.
+ */
+#ifndef IOATDMA_H
+#define IOATDMA_H
+
+#include <linux/dmaengine.h>
+#include <linux/init.h>
+#include <linux/dmapool.h>
+#include <linux/cache.h>
+#include <linux/pci_ids.h>
+#include <linux/circ_buf.h>
+#include <linux/interrupt.h>
+#include "registers.h"
+#include "hw.h"
+
+#define IOAT_DMA_VERSION "5.00"
+
+#define IOAT_DMA_DCA_ANY_CPU ~0
+
+#define to_ioatdma_device(dev) container_of(dev, struct ioatdma_device, dma_dev)
+#define to_dev(ioat_chan) (&(ioat_chan)->ioat_dma->pdev->dev)
+#define to_pdev(ioat_chan) ((ioat_chan)->ioat_dma->pdev)
+
+#define chan_num(ch) ((int)((ch)->reg_base - (ch)->ioat_dma->reg_base) / 0x80)
+
+/* ioat hardware assumes at least two sources for raid operations */
+#define src_cnt_to_sw(x) ((x) + 2)
+#define src_cnt_to_hw(x) ((x) - 2)
+#define ndest_to_sw(x) ((x) + 1)
+#define ndest_to_hw(x) ((x) - 1)
+#define src16_cnt_to_sw(x) ((x) + 9)
+#define src16_cnt_to_hw(x) ((x) - 9)
+
+/*
+ * workaround for IOAT ver.3.0 null descriptor issue
+ * (channel returns error when size is 0)
+ */
+#define NULL_DESC_BUFFER_SIZE 1
+
+enum ioat_irq_mode {
+ IOAT_NOIRQ = 0,
+ IOAT_MSIX,
+ IOAT_MSI,
+ IOAT_INTX
+};
+
+/**
+ * struct ioatdma_device - internal representation of a IOAT device
+ * @pdev: PCI-Express device
+ * @reg_base: MMIO register space base address
+ * @completion_pool: DMA buffers for completion ops
+ * @sed_hw_pool: DMA super descriptor pools
+ * @dma_dev: embedded struct dma_device
+ * @version: version of ioatdma device
+ * @msix_entries: irq handlers
+ * @idx: per channel data
+ * @dca: direct cache access context
+ * @irq_mode: interrupt mode (INTX, MSI, MSIX)
+ * @cap: read DMA capabilities register
+ */
+struct ioatdma_device {
+ struct pci_dev *pdev;
+ void __iomem *reg_base;
+ struct dma_pool *completion_pool;
+#define MAX_SED_POOLS 5
+ struct dma_pool *sed_hw_pool[MAX_SED_POOLS];
+ struct dma_device dma_dev;
+ u8 version;
+#define IOAT_MAX_CHANS 4
+ struct msix_entry msix_entries[IOAT_MAX_CHANS];
+ struct ioatdma_chan *idx[IOAT_MAX_CHANS];
+ struct dca_provider *dca;
+ enum ioat_irq_mode irq_mode;
+ u32 cap;
+
+ /* shadow version for CB3.3 chan reset errata workaround */
+ u64 msixtba0;
+ u64 msixdata0;
+ u32 msixpba;
+};
+
+#define IOAT_MAX_ORDER 16
+#define IOAT_MAX_DESCS (1 << IOAT_MAX_ORDER)
+#define IOAT_CHUNK_SIZE (SZ_512K)
+#define IOAT_DESCS_PER_CHUNK (IOAT_CHUNK_SIZE / IOAT_DESC_SZ)
+
+struct ioat_descs {
+ void *virt;
+ dma_addr_t hw;
+};
+
+struct ioatdma_chan {
+ struct dma_chan dma_chan;
+ void __iomem *reg_base;
+ dma_addr_t last_completion;
+ spinlock_t cleanup_lock;
+ unsigned long state;
+ #define IOAT_CHAN_DOWN 0
+ #define IOAT_COMPLETION_ACK 1
+ #define IOAT_RESET_PENDING 2
+ #define IOAT_KOBJ_INIT_FAIL 3
+ #define IOAT_RUN 5
+ #define IOAT_CHAN_ACTIVE 6
+ struct timer_list timer;
+ #define RESET_DELAY msecs_to_jiffies(100)
+ struct ioatdma_device *ioat_dma;
+ dma_addr_t completion_dma;
+ u64 *completion;
+ struct tasklet_struct cleanup_task;
+ struct kobject kobj;
+
+/* ioat v2 / v3 channel attributes
+ * @xfercap_log; log2 of channel max transfer length (for fast division)
+ * @head: allocated index
+ * @issued: hardware notification point
+ * @tail: cleanup index
+ * @dmacount: identical to 'head' except for occasionally resetting to zero
+ * @alloc_order: log2 of the number of allocated descriptors
+ * @produce: number of descriptors to produce at submit time
+ * @ring: software ring buffer implementation of hardware ring
+ * @prep_lock: serializes descriptor preparation (producers)
+ */
+ size_t xfercap_log;
+ u16 head;
+ u16 issued;
+ u16 tail;
+ u16 dmacount;
+ u16 alloc_order;
+ u16 produce;
+ struct ioat_ring_ent **ring;
+ spinlock_t prep_lock;
+ struct ioat_descs descs[IOAT_MAX_DESCS / IOAT_DESCS_PER_CHUNK];
+ int desc_chunks;
+ int intr_coalesce;
+ int prev_intr_coalesce;
+};
+
+struct ioat_sysfs_entry {
+ struct attribute attr;
+ ssize_t (*show)(struct dma_chan *, char *);
+ ssize_t (*store)(struct dma_chan *, const char *, size_t);
+};
+
+/**
+ * struct ioat_sed_ent - wrapper around super extended hardware descriptor
+ * @hw: hardware SED
+ * @dma: dma address for the SED
+ * @parent: point to the dma descriptor that's the parent
+ * @hw_pool: descriptor pool index
+ */
+struct ioat_sed_ent {
+ struct ioat_sed_raw_descriptor *hw;
+ dma_addr_t dma;
+ struct ioat_ring_ent *parent;
+ unsigned int hw_pool;
+};
+
+/**
+ * struct ioat_ring_ent - wrapper around hardware descriptor
+ * @hw: hardware DMA descriptor (for memcpy)
+ * @xor: hardware xor descriptor
+ * @xor_ex: hardware xor extension descriptor
+ * @pq: hardware pq descriptor
+ * @pq_ex: hardware pq extension descriptor
+ * @pqu: hardware pq update descriptor
+ * @raw: hardware raw (un-typed) descriptor
+ * @txd: the generic software descriptor for all engines
+ * @len: total transaction length for unmap
+ * @result: asynchronous result of validate operations
+ * @id: identifier for debug
+ * @sed: pointer to super extended descriptor sw desc
+ */
+
+struct ioat_ring_ent {
+ union {
+ struct ioat_dma_descriptor *hw;
+ struct ioat_xor_descriptor *xor;
+ struct ioat_xor_ext_descriptor *xor_ex;
+ struct ioat_pq_descriptor *pq;
+ struct ioat_pq_ext_descriptor *pq_ex;
+ struct ioat_pq_update_descriptor *pqu;
+ struct ioat_raw_descriptor *raw;
+ };
+ size_t len;
+ struct dma_async_tx_descriptor txd;
+ enum sum_check_flags *result;
+ #ifdef DEBUG
+ int id;
+ #endif
+ struct ioat_sed_ent *sed;
+};
+
+extern const struct sysfs_ops ioat_sysfs_ops;
+extern struct ioat_sysfs_entry ioat_version_attr;
+extern struct ioat_sysfs_entry ioat_cap_attr;
+extern int ioat_pending_level;
+extern struct kobj_type ioat_ktype;
+extern struct kmem_cache *ioat_cache;
+extern struct kmem_cache *ioat_sed_cache;
+
+static inline struct ioatdma_chan *to_ioat_chan(struct dma_chan *c)
+{
+ return container_of(c, struct ioatdma_chan, dma_chan);
+}
+
+/* wrapper around hardware descriptor format + additional software fields */
+#ifdef DEBUG
+#define set_desc_id(desc, i) ((desc)->id = (i))
+#define desc_id(desc) ((desc)->id)
+#else
+#define set_desc_id(desc, i)
+#define desc_id(desc) (0)
+#endif
+
+static inline void
+__dump_desc_dbg(struct ioatdma_chan *ioat_chan, struct ioat_dma_descriptor *hw,
+ struct dma_async_tx_descriptor *tx, int id)
+{
+ struct device *dev = to_dev(ioat_chan);
+
+ dev_dbg(dev, "desc[%d]: (%#llx->%#llx) cookie: %d flags: %#x"
+ " ctl: %#10.8x (op: %#x int_en: %d compl: %d)\n", id,
+ (unsigned long long) tx->phys,
+ (unsigned long long) hw->next, tx->cookie, tx->flags,
+ hw->ctl, hw->ctl_f.op, hw->ctl_f.int_en, hw->ctl_f.compl_write);
+}
+
+#define dump_desc_dbg(c, d) \
+ ({ if (d) __dump_desc_dbg(c, d->hw, &d->txd, desc_id(d)); 0; })
+
+static inline struct ioatdma_chan *
+ioat_chan_by_index(struct ioatdma_device *ioat_dma, int index)
+{
+ return ioat_dma->idx[index];
+}
+
+static inline u64 ioat_chansts(struct ioatdma_chan *ioat_chan)
+{
+ return readq(ioat_chan->reg_base + IOAT_CHANSTS_OFFSET);
+}
+
+static inline u64 ioat_chansts_to_addr(u64 status)
+{
+ return status & IOAT_CHANSTS_COMPLETED_DESCRIPTOR_ADDR;
+}
+
+static inline u32 ioat_chanerr(struct ioatdma_chan *ioat_chan)
+{
+ return readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
+}
+
+static inline void ioat_suspend(struct ioatdma_chan *ioat_chan)
+{
+ u8 ver = ioat_chan->ioat_dma->version;
+
+ writeb(IOAT_CHANCMD_SUSPEND,
+ ioat_chan->reg_base + IOAT_CHANCMD_OFFSET(ver));
+}
+
+static inline void ioat_reset(struct ioatdma_chan *ioat_chan)
+{
+ u8 ver = ioat_chan->ioat_dma->version;
+
+ writeb(IOAT_CHANCMD_RESET,
+ ioat_chan->reg_base + IOAT_CHANCMD_OFFSET(ver));
+}
+
+static inline bool ioat_reset_pending(struct ioatdma_chan *ioat_chan)
+{
+ u8 ver = ioat_chan->ioat_dma->version;
+ u8 cmd;
+
+ cmd = readb(ioat_chan->reg_base + IOAT_CHANCMD_OFFSET(ver));
+ return (cmd & IOAT_CHANCMD_RESET) == IOAT_CHANCMD_RESET;
+}
+
+static inline bool is_ioat_active(unsigned long status)
+{
+ return ((status & IOAT_CHANSTS_STATUS) == IOAT_CHANSTS_ACTIVE);
+}
+
+static inline bool is_ioat_idle(unsigned long status)
+{
+ return ((status & IOAT_CHANSTS_STATUS) == IOAT_CHANSTS_DONE);
+}
+
+static inline bool is_ioat_halted(unsigned long status)
+{
+ return ((status & IOAT_CHANSTS_STATUS) == IOAT_CHANSTS_HALTED);
+}
+
+static inline bool is_ioat_suspended(unsigned long status)
+{
+ return ((status & IOAT_CHANSTS_STATUS) == IOAT_CHANSTS_SUSPENDED);
+}
+
+/* channel was fatally programmed */
+static inline bool is_ioat_bug(unsigned long err)
+{
+ return !!err;
+}
+
+
+static inline u32 ioat_ring_size(struct ioatdma_chan *ioat_chan)
+{
+ return 1 << ioat_chan->alloc_order;
+}
+
+/* count of descriptors in flight with the engine */
+static inline u16 ioat_ring_active(struct ioatdma_chan *ioat_chan)
+{
+ return CIRC_CNT(ioat_chan->head, ioat_chan->tail,
+ ioat_ring_size(ioat_chan));
+}
+
+/* count of descriptors pending submission to hardware */
+static inline u16 ioat_ring_pending(struct ioatdma_chan *ioat_chan)
+{
+ return CIRC_CNT(ioat_chan->head, ioat_chan->issued,
+ ioat_ring_size(ioat_chan));
+}
+
+static inline u32 ioat_ring_space(struct ioatdma_chan *ioat_chan)
+{
+ return ioat_ring_size(ioat_chan) - ioat_ring_active(ioat_chan);
+}
+
+static inline u16
+ioat_xferlen_to_descs(struct ioatdma_chan *ioat_chan, size_t len)
+{
+ u16 num_descs = len >> ioat_chan->xfercap_log;
+
+ num_descs += !!(len & ((1 << ioat_chan->xfercap_log) - 1));
+ return num_descs;
+}
+
+static inline struct ioat_ring_ent *
+ioat_get_ring_ent(struct ioatdma_chan *ioat_chan, u16 idx)
+{
+ return ioat_chan->ring[idx & (ioat_ring_size(ioat_chan) - 1)];
+}
+
+static inline void
+ioat_set_chainaddr(struct ioatdma_chan *ioat_chan, u64 addr)
+{
+ writel(addr & 0x00000000FFFFFFFF,
+ ioat_chan->reg_base + IOAT2_CHAINADDR_OFFSET_LOW);
+ writel(addr >> 32,
+ ioat_chan->reg_base + IOAT2_CHAINADDR_OFFSET_HIGH);
+}
+
+/* IOAT Prep functions */
+struct dma_async_tx_descriptor *
+ioat_dma_prep_memcpy_lock(struct dma_chan *c, dma_addr_t dma_dest,
+ dma_addr_t dma_src, size_t len, unsigned long flags);
+struct dma_async_tx_descriptor *
+ioat_prep_interrupt_lock(struct dma_chan *c, unsigned long flags);
+struct dma_async_tx_descriptor *
+ioat_prep_xor(struct dma_chan *chan, dma_addr_t dest, dma_addr_t *src,
+ unsigned int src_cnt, size_t len, unsigned long flags);
+struct dma_async_tx_descriptor *
+ioat_prep_xor_val(struct dma_chan *chan, dma_addr_t *src,
+ unsigned int src_cnt, size_t len,
+ enum sum_check_flags *result, unsigned long flags);
+struct dma_async_tx_descriptor *
+ioat_prep_pq(struct dma_chan *chan, dma_addr_t *dst, dma_addr_t *src,
+ unsigned int src_cnt, const unsigned char *scf, size_t len,
+ unsigned long flags);
+struct dma_async_tx_descriptor *
+ioat_prep_pq_val(struct dma_chan *chan, dma_addr_t *pq, dma_addr_t *src,
+ unsigned int src_cnt, const unsigned char *scf, size_t len,
+ enum sum_check_flags *pqres, unsigned long flags);
+struct dma_async_tx_descriptor *
+ioat_prep_pqxor(struct dma_chan *chan, dma_addr_t dst, dma_addr_t *src,
+ unsigned int src_cnt, size_t len, unsigned long flags);
+struct dma_async_tx_descriptor *
+ioat_prep_pqxor_val(struct dma_chan *chan, dma_addr_t *src,
+ unsigned int src_cnt, size_t len,
+ enum sum_check_flags *result, unsigned long flags);
+
+/* IOAT Operation functions */
+irqreturn_t ioat_dma_do_interrupt(int irq, void *data);
+irqreturn_t ioat_dma_do_interrupt_msix(int irq, void *data);
+struct ioat_ring_ent **
+ioat_alloc_ring(struct dma_chan *c, int order, gfp_t flags);
+void ioat_start_null_desc(struct ioatdma_chan *ioat_chan);
+void ioat_free_ring_ent(struct ioat_ring_ent *desc, struct dma_chan *chan);
+int ioat_reset_hw(struct ioatdma_chan *ioat_chan);
+enum dma_status
+ioat_tx_status(struct dma_chan *c, dma_cookie_t cookie,
+ struct dma_tx_state *txstate);
+void ioat_cleanup_event(struct tasklet_struct *t);
+void ioat_timer_event(struct timer_list *t);
+int ioat_check_space_lock(struct ioatdma_chan *ioat_chan, int num_descs);
+void ioat_issue_pending(struct dma_chan *chan);
+
+/* IOAT Init functions */
+bool is_bwd_ioat(struct pci_dev *pdev);
+struct dca_provider *ioat_dca_init(struct pci_dev *pdev, void __iomem *iobase);
+void ioat_kobject_add(struct ioatdma_device *ioat_dma, struct kobj_type *type);
+void ioat_kobject_del(struct ioatdma_device *ioat_dma);
+int ioat_dma_setup_interrupts(struct ioatdma_device *ioat_dma);
+void ioat_stop(struct ioatdma_chan *ioat_chan);
+#endif /* IOATDMA_H */
diff --git a/drivers/dma/ioat/hw.h b/drivers/dma/ioat/hw.h
new file mode 100644
index 000000000..79e4e4c09
--- /dev/null
+++ b/drivers/dma/ioat/hw.h
@@ -0,0 +1,271 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright(c) 2004 - 2009 Intel Corporation. All rights reserved.
+ */
+#ifndef _IOAT_HW_H_
+#define _IOAT_HW_H_
+
+/* PCI Configuration Space Values */
+#define IOAT_MMIO_BAR 0
+
+/* CB device ID's */
+#define PCI_DEVICE_ID_INTEL_IOAT_IVB0 0x0e20
+#define PCI_DEVICE_ID_INTEL_IOAT_IVB1 0x0e21
+#define PCI_DEVICE_ID_INTEL_IOAT_IVB2 0x0e22
+#define PCI_DEVICE_ID_INTEL_IOAT_IVB3 0x0e23
+#define PCI_DEVICE_ID_INTEL_IOAT_IVB4 0x0e24
+#define PCI_DEVICE_ID_INTEL_IOAT_IVB5 0x0e25
+#define PCI_DEVICE_ID_INTEL_IOAT_IVB6 0x0e26
+#define PCI_DEVICE_ID_INTEL_IOAT_IVB7 0x0e27
+#define PCI_DEVICE_ID_INTEL_IOAT_IVB8 0x0e2e
+#define PCI_DEVICE_ID_INTEL_IOAT_IVB9 0x0e2f
+
+#define PCI_DEVICE_ID_INTEL_IOAT_HSW0 0x2f20
+#define PCI_DEVICE_ID_INTEL_IOAT_HSW1 0x2f21
+#define PCI_DEVICE_ID_INTEL_IOAT_HSW2 0x2f22
+#define PCI_DEVICE_ID_INTEL_IOAT_HSW3 0x2f23
+#define PCI_DEVICE_ID_INTEL_IOAT_HSW4 0x2f24
+#define PCI_DEVICE_ID_INTEL_IOAT_HSW5 0x2f25
+#define PCI_DEVICE_ID_INTEL_IOAT_HSW6 0x2f26
+#define PCI_DEVICE_ID_INTEL_IOAT_HSW7 0x2f27
+#define PCI_DEVICE_ID_INTEL_IOAT_HSW8 0x2f2e
+#define PCI_DEVICE_ID_INTEL_IOAT_HSW9 0x2f2f
+
+#define PCI_DEVICE_ID_INTEL_IOAT_BWD0 0x0C50
+#define PCI_DEVICE_ID_INTEL_IOAT_BWD1 0x0C51
+#define PCI_DEVICE_ID_INTEL_IOAT_BWD2 0x0C52
+#define PCI_DEVICE_ID_INTEL_IOAT_BWD3 0x0C53
+
+#define PCI_DEVICE_ID_INTEL_IOAT_BDXDE0 0x6f50
+#define PCI_DEVICE_ID_INTEL_IOAT_BDXDE1 0x6f51
+#define PCI_DEVICE_ID_INTEL_IOAT_BDXDE2 0x6f52
+#define PCI_DEVICE_ID_INTEL_IOAT_BDXDE3 0x6f53
+
+#define PCI_DEVICE_ID_INTEL_IOAT_BDX0 0x6f20
+#define PCI_DEVICE_ID_INTEL_IOAT_BDX1 0x6f21
+#define PCI_DEVICE_ID_INTEL_IOAT_BDX2 0x6f22
+#define PCI_DEVICE_ID_INTEL_IOAT_BDX3 0x6f23
+#define PCI_DEVICE_ID_INTEL_IOAT_BDX4 0x6f24
+#define PCI_DEVICE_ID_INTEL_IOAT_BDX5 0x6f25
+#define PCI_DEVICE_ID_INTEL_IOAT_BDX6 0x6f26
+#define PCI_DEVICE_ID_INTEL_IOAT_BDX7 0x6f27
+#define PCI_DEVICE_ID_INTEL_IOAT_BDX8 0x6f2e
+#define PCI_DEVICE_ID_INTEL_IOAT_BDX9 0x6f2f
+
+#define PCI_DEVICE_ID_INTEL_IOAT_SKX 0x2021
+
+#define PCI_DEVICE_ID_INTEL_IOAT_ICX 0x0b00
+
+#define IOAT_VER_1_2 0x12 /* Version 1.2 */
+#define IOAT_VER_2_0 0x20 /* Version 2.0 */
+#define IOAT_VER_3_0 0x30 /* Version 3.0 */
+#define IOAT_VER_3_2 0x32 /* Version 3.2 */
+#define IOAT_VER_3_3 0x33 /* Version 3.3 */
+#define IOAT_VER_3_4 0x34 /* Version 3.4 */
+
+
+int system_has_dca_enabled(struct pci_dev *pdev);
+
+#define IOAT_DESC_SZ 64
+
+struct ioat_dma_descriptor {
+ uint32_t size;
+ union {
+ uint32_t ctl;
+ struct {
+ unsigned int int_en:1;
+ unsigned int src_snoop_dis:1;
+ unsigned int dest_snoop_dis:1;
+ unsigned int compl_write:1;
+ unsigned int fence:1;
+ unsigned int null:1;
+ unsigned int src_brk:1;
+ unsigned int dest_brk:1;
+ unsigned int bundle:1;
+ unsigned int dest_dca:1;
+ unsigned int hint:1;
+ unsigned int rsvd2:13;
+ #define IOAT_OP_COPY 0x00
+ unsigned int op:8;
+ } ctl_f;
+ };
+ uint64_t src_addr;
+ uint64_t dst_addr;
+ uint64_t next;
+ uint64_t rsv1;
+ uint64_t rsv2;
+ /* store some driver data in an unused portion of the descriptor */
+ union {
+ uint64_t user1;
+ uint64_t tx_cnt;
+ };
+ uint64_t user2;
+};
+
+struct ioat_xor_descriptor {
+ uint32_t size;
+ union {
+ uint32_t ctl;
+ struct {
+ unsigned int int_en:1;
+ unsigned int src_snoop_dis:1;
+ unsigned int dest_snoop_dis:1;
+ unsigned int compl_write:1;
+ unsigned int fence:1;
+ unsigned int src_cnt:3;
+ unsigned int bundle:1;
+ unsigned int dest_dca:1;
+ unsigned int hint:1;
+ unsigned int rsvd:13;
+ #define IOAT_OP_XOR 0x87
+ #define IOAT_OP_XOR_VAL 0x88
+ unsigned int op:8;
+ } ctl_f;
+ };
+ uint64_t src_addr;
+ uint64_t dst_addr;
+ uint64_t next;
+ uint64_t src_addr2;
+ uint64_t src_addr3;
+ uint64_t src_addr4;
+ uint64_t src_addr5;
+};
+
+struct ioat_xor_ext_descriptor {
+ uint64_t src_addr6;
+ uint64_t src_addr7;
+ uint64_t src_addr8;
+ uint64_t next;
+ uint64_t rsvd[4];
+};
+
+struct ioat_pq_descriptor {
+ union {
+ uint32_t size;
+ uint32_t dwbes;
+ struct {
+ unsigned int rsvd:25;
+ unsigned int p_val_err:1;
+ unsigned int q_val_err:1;
+ unsigned int rsvd1:4;
+ unsigned int wbes:1;
+ } dwbes_f;
+ };
+ union {
+ uint32_t ctl;
+ struct {
+ unsigned int int_en:1;
+ unsigned int src_snoop_dis:1;
+ unsigned int dest_snoop_dis:1;
+ unsigned int compl_write:1;
+ unsigned int fence:1;
+ unsigned int src_cnt:3;
+ unsigned int bundle:1;
+ unsigned int dest_dca:1;
+ unsigned int hint:1;
+ unsigned int p_disable:1;
+ unsigned int q_disable:1;
+ unsigned int rsvd2:2;
+ unsigned int wb_en:1;
+ unsigned int prl_en:1;
+ unsigned int rsvd3:7;
+ #define IOAT_OP_PQ 0x89
+ #define IOAT_OP_PQ_VAL 0x8a
+ #define IOAT_OP_PQ_16S 0xa0
+ #define IOAT_OP_PQ_VAL_16S 0xa1
+ unsigned int op:8;
+ } ctl_f;
+ };
+ uint64_t src_addr;
+ uint64_t p_addr;
+ uint64_t next;
+ uint64_t src_addr2;
+ union {
+ uint64_t src_addr3;
+ uint64_t sed_addr;
+ };
+ uint8_t coef[8];
+ uint64_t q_addr;
+};
+
+struct ioat_pq_ext_descriptor {
+ uint64_t src_addr4;
+ uint64_t src_addr5;
+ uint64_t src_addr6;
+ uint64_t next;
+ uint64_t src_addr7;
+ uint64_t src_addr8;
+ uint64_t rsvd[2];
+};
+
+struct ioat_pq_update_descriptor {
+ uint32_t size;
+ union {
+ uint32_t ctl;
+ struct {
+ unsigned int int_en:1;
+ unsigned int src_snoop_dis:1;
+ unsigned int dest_snoop_dis:1;
+ unsigned int compl_write:1;
+ unsigned int fence:1;
+ unsigned int src_cnt:3;
+ unsigned int bundle:1;
+ unsigned int dest_dca:1;
+ unsigned int hint:1;
+ unsigned int p_disable:1;
+ unsigned int q_disable:1;
+ unsigned int rsvd:3;
+ unsigned int coef:8;
+ #define IOAT_OP_PQ_UP 0x8b
+ unsigned int op:8;
+ } ctl_f;
+ };
+ uint64_t src_addr;
+ uint64_t p_addr;
+ uint64_t next;
+ uint64_t src_addr2;
+ uint64_t p_src;
+ uint64_t q_src;
+ uint64_t q_addr;
+};
+
+struct ioat_raw_descriptor {
+ uint64_t field[8];
+};
+
+struct ioat_pq16a_descriptor {
+ uint8_t coef[8];
+ uint64_t src_addr3;
+ uint64_t src_addr4;
+ uint64_t src_addr5;
+ uint64_t src_addr6;
+ uint64_t src_addr7;
+ uint64_t src_addr8;
+ uint64_t src_addr9;
+};
+
+struct ioat_pq16b_descriptor {
+ uint64_t src_addr10;
+ uint64_t src_addr11;
+ uint64_t src_addr12;
+ uint64_t src_addr13;
+ uint64_t src_addr14;
+ uint64_t src_addr15;
+ uint64_t src_addr16;
+ uint64_t rsvd;
+};
+
+union ioat_sed_pq_descriptor {
+ struct ioat_pq16a_descriptor a;
+ struct ioat_pq16b_descriptor b;
+};
+
+#define SED_SIZE 64
+
+struct ioat_sed_raw_descriptor {
+ uint64_t a[8];
+ uint64_t b[8];
+ uint64_t c[8];
+};
+
+#endif
diff --git a/drivers/dma/ioat/init.c b/drivers/dma/ioat/init.c
new file mode 100644
index 000000000..5d707ff63
--- /dev/null
+++ b/drivers/dma/ioat/init.c
@@ -0,0 +1,1455 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Intel I/OAT DMA Linux driver
+ * Copyright(c) 2004 - 2015 Intel Corporation.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/pci.h>
+#include <linux/interrupt.h>
+#include <linux/dmaengine.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/workqueue.h>
+#include <linux/prefetch.h>
+#include <linux/dca.h>
+#include <linux/aer.h>
+#include <linux/sizes.h>
+#include "dma.h"
+#include "registers.h"
+#include "hw.h"
+
+#include "../dmaengine.h"
+
+MODULE_VERSION(IOAT_DMA_VERSION);
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_AUTHOR("Intel Corporation");
+
+static const struct pci_device_id ioat_pci_tbl[] = {
+ /* I/OAT v3 platforms */
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG0) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG1) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG2) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG3) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG4) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG5) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG6) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG7) },
+
+ /* I/OAT v3.2 platforms */
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF0) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF1) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF2) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF3) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF4) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF5) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF6) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF7) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF8) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF9) },
+
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB0) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB1) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB2) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB3) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB4) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB5) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB6) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB7) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB8) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB9) },
+
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB0) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB1) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB2) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB3) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB4) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB5) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB6) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB7) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB8) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB9) },
+
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW0) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW1) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW2) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW3) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW4) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW5) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW6) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW7) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW8) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW9) },
+
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX0) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX1) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX2) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX3) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX4) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX5) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX6) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX7) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX8) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX9) },
+
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SKX) },
+
+ /* I/OAT v3.3 platforms */
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD0) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD1) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD2) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD3) },
+
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE0) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE1) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE2) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE3) },
+
+ /* I/OAT v3.4 platforms */
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_ICX) },
+
+ { 0, }
+};
+MODULE_DEVICE_TABLE(pci, ioat_pci_tbl);
+
+static int ioat_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id);
+static void ioat_remove(struct pci_dev *pdev);
+static void
+ioat_init_channel(struct ioatdma_device *ioat_dma,
+ struct ioatdma_chan *ioat_chan, int idx);
+static void ioat_intr_quirk(struct ioatdma_device *ioat_dma);
+static void ioat_enumerate_channels(struct ioatdma_device *ioat_dma);
+static int ioat3_dma_self_test(struct ioatdma_device *ioat_dma);
+
+static int ioat_dca_enabled = 1;
+module_param(ioat_dca_enabled, int, 0644);
+MODULE_PARM_DESC(ioat_dca_enabled, "control support of dca service (default: 1)");
+int ioat_pending_level = 7;
+module_param(ioat_pending_level, int, 0644);
+MODULE_PARM_DESC(ioat_pending_level,
+ "high-water mark for pushing ioat descriptors (default: 7)");
+static char ioat_interrupt_style[32] = "msix";
+module_param_string(ioat_interrupt_style, ioat_interrupt_style,
+ sizeof(ioat_interrupt_style), 0644);
+MODULE_PARM_DESC(ioat_interrupt_style,
+ "set ioat interrupt style: msix (default), msi, intx");
+
+struct kmem_cache *ioat_cache;
+struct kmem_cache *ioat_sed_cache;
+
+static bool is_jf_ioat(struct pci_dev *pdev)
+{
+ switch (pdev->device) {
+ case PCI_DEVICE_ID_INTEL_IOAT_JSF0:
+ case PCI_DEVICE_ID_INTEL_IOAT_JSF1:
+ case PCI_DEVICE_ID_INTEL_IOAT_JSF2:
+ case PCI_DEVICE_ID_INTEL_IOAT_JSF3:
+ case PCI_DEVICE_ID_INTEL_IOAT_JSF4:
+ case PCI_DEVICE_ID_INTEL_IOAT_JSF5:
+ case PCI_DEVICE_ID_INTEL_IOAT_JSF6:
+ case PCI_DEVICE_ID_INTEL_IOAT_JSF7:
+ case PCI_DEVICE_ID_INTEL_IOAT_JSF8:
+ case PCI_DEVICE_ID_INTEL_IOAT_JSF9:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static bool is_snb_ioat(struct pci_dev *pdev)
+{
+ switch (pdev->device) {
+ case PCI_DEVICE_ID_INTEL_IOAT_SNB0:
+ case PCI_DEVICE_ID_INTEL_IOAT_SNB1:
+ case PCI_DEVICE_ID_INTEL_IOAT_SNB2:
+ case PCI_DEVICE_ID_INTEL_IOAT_SNB3:
+ case PCI_DEVICE_ID_INTEL_IOAT_SNB4:
+ case PCI_DEVICE_ID_INTEL_IOAT_SNB5:
+ case PCI_DEVICE_ID_INTEL_IOAT_SNB6:
+ case PCI_DEVICE_ID_INTEL_IOAT_SNB7:
+ case PCI_DEVICE_ID_INTEL_IOAT_SNB8:
+ case PCI_DEVICE_ID_INTEL_IOAT_SNB9:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static bool is_ivb_ioat(struct pci_dev *pdev)
+{
+ switch (pdev->device) {
+ case PCI_DEVICE_ID_INTEL_IOAT_IVB0:
+ case PCI_DEVICE_ID_INTEL_IOAT_IVB1:
+ case PCI_DEVICE_ID_INTEL_IOAT_IVB2:
+ case PCI_DEVICE_ID_INTEL_IOAT_IVB3:
+ case PCI_DEVICE_ID_INTEL_IOAT_IVB4:
+ case PCI_DEVICE_ID_INTEL_IOAT_IVB5:
+ case PCI_DEVICE_ID_INTEL_IOAT_IVB6:
+ case PCI_DEVICE_ID_INTEL_IOAT_IVB7:
+ case PCI_DEVICE_ID_INTEL_IOAT_IVB8:
+ case PCI_DEVICE_ID_INTEL_IOAT_IVB9:
+ return true;
+ default:
+ return false;
+ }
+
+}
+
+static bool is_hsw_ioat(struct pci_dev *pdev)
+{
+ switch (pdev->device) {
+ case PCI_DEVICE_ID_INTEL_IOAT_HSW0:
+ case PCI_DEVICE_ID_INTEL_IOAT_HSW1:
+ case PCI_DEVICE_ID_INTEL_IOAT_HSW2:
+ case PCI_DEVICE_ID_INTEL_IOAT_HSW3:
+ case PCI_DEVICE_ID_INTEL_IOAT_HSW4:
+ case PCI_DEVICE_ID_INTEL_IOAT_HSW5:
+ case PCI_DEVICE_ID_INTEL_IOAT_HSW6:
+ case PCI_DEVICE_ID_INTEL_IOAT_HSW7:
+ case PCI_DEVICE_ID_INTEL_IOAT_HSW8:
+ case PCI_DEVICE_ID_INTEL_IOAT_HSW9:
+ return true;
+ default:
+ return false;
+ }
+
+}
+
+static bool is_bdx_ioat(struct pci_dev *pdev)
+{
+ switch (pdev->device) {
+ case PCI_DEVICE_ID_INTEL_IOAT_BDX0:
+ case PCI_DEVICE_ID_INTEL_IOAT_BDX1:
+ case PCI_DEVICE_ID_INTEL_IOAT_BDX2:
+ case PCI_DEVICE_ID_INTEL_IOAT_BDX3:
+ case PCI_DEVICE_ID_INTEL_IOAT_BDX4:
+ case PCI_DEVICE_ID_INTEL_IOAT_BDX5:
+ case PCI_DEVICE_ID_INTEL_IOAT_BDX6:
+ case PCI_DEVICE_ID_INTEL_IOAT_BDX7:
+ case PCI_DEVICE_ID_INTEL_IOAT_BDX8:
+ case PCI_DEVICE_ID_INTEL_IOAT_BDX9:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static inline bool is_skx_ioat(struct pci_dev *pdev)
+{
+ return (pdev->device == PCI_DEVICE_ID_INTEL_IOAT_SKX) ? true : false;
+}
+
+static bool is_xeon_cb32(struct pci_dev *pdev)
+{
+ return is_jf_ioat(pdev) || is_snb_ioat(pdev) || is_ivb_ioat(pdev) ||
+ is_hsw_ioat(pdev) || is_bdx_ioat(pdev) || is_skx_ioat(pdev);
+}
+
+bool is_bwd_ioat(struct pci_dev *pdev)
+{
+ switch (pdev->device) {
+ case PCI_DEVICE_ID_INTEL_IOAT_BWD0:
+ case PCI_DEVICE_ID_INTEL_IOAT_BWD1:
+ case PCI_DEVICE_ID_INTEL_IOAT_BWD2:
+ case PCI_DEVICE_ID_INTEL_IOAT_BWD3:
+ /* even though not Atom, BDX-DE has same DMA silicon */
+ case PCI_DEVICE_ID_INTEL_IOAT_BDXDE0:
+ case PCI_DEVICE_ID_INTEL_IOAT_BDXDE1:
+ case PCI_DEVICE_ID_INTEL_IOAT_BDXDE2:
+ case PCI_DEVICE_ID_INTEL_IOAT_BDXDE3:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static bool is_bwd_noraid(struct pci_dev *pdev)
+{
+ switch (pdev->device) {
+ case PCI_DEVICE_ID_INTEL_IOAT_BWD2:
+ case PCI_DEVICE_ID_INTEL_IOAT_BWD3:
+ case PCI_DEVICE_ID_INTEL_IOAT_BDXDE0:
+ case PCI_DEVICE_ID_INTEL_IOAT_BDXDE1:
+ case PCI_DEVICE_ID_INTEL_IOAT_BDXDE2:
+ case PCI_DEVICE_ID_INTEL_IOAT_BDXDE3:
+ return true;
+ default:
+ return false;
+ }
+
+}
+
+/*
+ * Perform a IOAT transaction to verify the HW works.
+ */
+#define IOAT_TEST_SIZE 2000
+
+static void ioat_dma_test_callback(void *dma_async_param)
+{
+ struct completion *cmp = dma_async_param;
+
+ complete(cmp);
+}
+
+/**
+ * ioat_dma_self_test - Perform a IOAT transaction to verify the HW works.
+ * @ioat_dma: dma device to be tested
+ */
+static int ioat_dma_self_test(struct ioatdma_device *ioat_dma)
+{
+ int i;
+ u8 *src;
+ u8 *dest;
+ struct dma_device *dma = &ioat_dma->dma_dev;
+ struct device *dev = &ioat_dma->pdev->dev;
+ struct dma_chan *dma_chan;
+ struct dma_async_tx_descriptor *tx;
+ dma_addr_t dma_dest, dma_src;
+ dma_cookie_t cookie;
+ int err = 0;
+ struct completion cmp;
+ unsigned long tmo;
+ unsigned long flags;
+
+ src = kzalloc(IOAT_TEST_SIZE, GFP_KERNEL);
+ if (!src)
+ return -ENOMEM;
+ dest = kzalloc(IOAT_TEST_SIZE, GFP_KERNEL);
+ if (!dest) {
+ kfree(src);
+ return -ENOMEM;
+ }
+
+ /* Fill in src buffer */
+ for (i = 0; i < IOAT_TEST_SIZE; i++)
+ src[i] = (u8)i;
+
+ /* Start copy, using first DMA channel */
+ dma_chan = container_of(dma->channels.next, struct dma_chan,
+ device_node);
+ if (dma->device_alloc_chan_resources(dma_chan) < 1) {
+ dev_err(dev, "selftest cannot allocate chan resource\n");
+ err = -ENODEV;
+ goto out;
+ }
+
+ dma_src = dma_map_single(dev, src, IOAT_TEST_SIZE, DMA_TO_DEVICE);
+ if (dma_mapping_error(dev, dma_src)) {
+ dev_err(dev, "mapping src buffer failed\n");
+ err = -ENOMEM;
+ goto free_resources;
+ }
+ dma_dest = dma_map_single(dev, dest, IOAT_TEST_SIZE, DMA_FROM_DEVICE);
+ if (dma_mapping_error(dev, dma_dest)) {
+ dev_err(dev, "mapping dest buffer failed\n");
+ err = -ENOMEM;
+ goto unmap_src;
+ }
+ flags = DMA_PREP_INTERRUPT;
+ tx = ioat_dma->dma_dev.device_prep_dma_memcpy(dma_chan, dma_dest,
+ dma_src, IOAT_TEST_SIZE,
+ flags);
+ if (!tx) {
+ dev_err(dev, "Self-test prep failed, disabling\n");
+ err = -ENODEV;
+ goto unmap_dma;
+ }
+
+ async_tx_ack(tx);
+ init_completion(&cmp);
+ tx->callback = ioat_dma_test_callback;
+ tx->callback_param = &cmp;
+ cookie = tx->tx_submit(tx);
+ if (cookie < 0) {
+ dev_err(dev, "Self-test setup failed, disabling\n");
+ err = -ENODEV;
+ goto unmap_dma;
+ }
+ dma->device_issue_pending(dma_chan);
+
+ tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000));
+
+ if (tmo == 0 ||
+ dma->device_tx_status(dma_chan, cookie, NULL)
+ != DMA_COMPLETE) {
+ dev_err(dev, "Self-test copy timed out, disabling\n");
+ err = -ENODEV;
+ goto unmap_dma;
+ }
+ if (memcmp(src, dest, IOAT_TEST_SIZE)) {
+ dev_err(dev, "Self-test copy failed compare, disabling\n");
+ err = -ENODEV;
+ goto unmap_dma;
+ }
+
+unmap_dma:
+ dma_unmap_single(dev, dma_dest, IOAT_TEST_SIZE, DMA_FROM_DEVICE);
+unmap_src:
+ dma_unmap_single(dev, dma_src, IOAT_TEST_SIZE, DMA_TO_DEVICE);
+free_resources:
+ dma->device_free_chan_resources(dma_chan);
+out:
+ kfree(src);
+ kfree(dest);
+ return err;
+}
+
+/**
+ * ioat_dma_setup_interrupts - setup interrupt handler
+ * @ioat_dma: ioat dma device
+ */
+int ioat_dma_setup_interrupts(struct ioatdma_device *ioat_dma)
+{
+ struct ioatdma_chan *ioat_chan;
+ struct pci_dev *pdev = ioat_dma->pdev;
+ struct device *dev = &pdev->dev;
+ struct msix_entry *msix;
+ int i, j, msixcnt;
+ int err = -EINVAL;
+ u8 intrctrl = 0;
+
+ if (!strcmp(ioat_interrupt_style, "msix"))
+ goto msix;
+ if (!strcmp(ioat_interrupt_style, "msi"))
+ goto msi;
+ if (!strcmp(ioat_interrupt_style, "intx"))
+ goto intx;
+ dev_err(dev, "invalid ioat_interrupt_style %s\n", ioat_interrupt_style);
+ goto err_no_irq;
+
+msix:
+ /* The number of MSI-X vectors should equal the number of channels */
+ msixcnt = ioat_dma->dma_dev.chancnt;
+ for (i = 0; i < msixcnt; i++)
+ ioat_dma->msix_entries[i].entry = i;
+
+ err = pci_enable_msix_exact(pdev, ioat_dma->msix_entries, msixcnt);
+ if (err)
+ goto msi;
+
+ for (i = 0; i < msixcnt; i++) {
+ msix = &ioat_dma->msix_entries[i];
+ ioat_chan = ioat_chan_by_index(ioat_dma, i);
+ err = devm_request_irq(dev, msix->vector,
+ ioat_dma_do_interrupt_msix, 0,
+ "ioat-msix", ioat_chan);
+ if (err) {
+ for (j = 0; j < i; j++) {
+ msix = &ioat_dma->msix_entries[j];
+ ioat_chan = ioat_chan_by_index(ioat_dma, j);
+ devm_free_irq(dev, msix->vector, ioat_chan);
+ }
+ goto msi;
+ }
+ }
+ intrctrl |= IOAT_INTRCTRL_MSIX_VECTOR_CONTROL;
+ ioat_dma->irq_mode = IOAT_MSIX;
+ goto done;
+
+msi:
+ err = pci_enable_msi(pdev);
+ if (err)
+ goto intx;
+
+ err = devm_request_irq(dev, pdev->irq, ioat_dma_do_interrupt, 0,
+ "ioat-msi", ioat_dma);
+ if (err) {
+ pci_disable_msi(pdev);
+ goto intx;
+ }
+ ioat_dma->irq_mode = IOAT_MSI;
+ goto done;
+
+intx:
+ err = devm_request_irq(dev, pdev->irq, ioat_dma_do_interrupt,
+ IRQF_SHARED, "ioat-intx", ioat_dma);
+ if (err)
+ goto err_no_irq;
+
+ ioat_dma->irq_mode = IOAT_INTX;
+done:
+ if (is_bwd_ioat(pdev))
+ ioat_intr_quirk(ioat_dma);
+ intrctrl |= IOAT_INTRCTRL_MASTER_INT_EN;
+ writeb(intrctrl, ioat_dma->reg_base + IOAT_INTRCTRL_OFFSET);
+ return 0;
+
+err_no_irq:
+ /* Disable all interrupt generation */
+ writeb(0, ioat_dma->reg_base + IOAT_INTRCTRL_OFFSET);
+ ioat_dma->irq_mode = IOAT_NOIRQ;
+ dev_err(dev, "no usable interrupts\n");
+ return err;
+}
+
+static void ioat_disable_interrupts(struct ioatdma_device *ioat_dma)
+{
+ /* Disable all interrupt generation */
+ writeb(0, ioat_dma->reg_base + IOAT_INTRCTRL_OFFSET);
+}
+
+static int ioat_probe(struct ioatdma_device *ioat_dma)
+{
+ int err = -ENODEV;
+ struct dma_device *dma = &ioat_dma->dma_dev;
+ struct pci_dev *pdev = ioat_dma->pdev;
+ struct device *dev = &pdev->dev;
+
+ ioat_dma->completion_pool = dma_pool_create("completion_pool", dev,
+ sizeof(u64),
+ SMP_CACHE_BYTES,
+ SMP_CACHE_BYTES);
+
+ if (!ioat_dma->completion_pool) {
+ err = -ENOMEM;
+ goto err_out;
+ }
+
+ ioat_enumerate_channels(ioat_dma);
+
+ dma_cap_set(DMA_MEMCPY, dma->cap_mask);
+ dma->dev = &pdev->dev;
+
+ if (!dma->chancnt) {
+ dev_err(dev, "channel enumeration error\n");
+ goto err_setup_interrupts;
+ }
+
+ err = ioat_dma_setup_interrupts(ioat_dma);
+ if (err)
+ goto err_setup_interrupts;
+
+ err = ioat3_dma_self_test(ioat_dma);
+ if (err)
+ goto err_self_test;
+
+ return 0;
+
+err_self_test:
+ ioat_disable_interrupts(ioat_dma);
+err_setup_interrupts:
+ dma_pool_destroy(ioat_dma->completion_pool);
+err_out:
+ return err;
+}
+
+static int ioat_register(struct ioatdma_device *ioat_dma)
+{
+ int err = dma_async_device_register(&ioat_dma->dma_dev);
+
+ if (err) {
+ ioat_disable_interrupts(ioat_dma);
+ dma_pool_destroy(ioat_dma->completion_pool);
+ }
+
+ return err;
+}
+
+static void ioat_dma_remove(struct ioatdma_device *ioat_dma)
+{
+ struct dma_device *dma = &ioat_dma->dma_dev;
+
+ ioat_disable_interrupts(ioat_dma);
+
+ ioat_kobject_del(ioat_dma);
+
+ dma_async_device_unregister(dma);
+}
+
+/**
+ * ioat_enumerate_channels - find and initialize the device's channels
+ * @ioat_dma: the ioat dma device to be enumerated
+ */
+static void ioat_enumerate_channels(struct ioatdma_device *ioat_dma)
+{
+ struct ioatdma_chan *ioat_chan;
+ struct device *dev = &ioat_dma->pdev->dev;
+ struct dma_device *dma = &ioat_dma->dma_dev;
+ u8 xfercap_log;
+ int i;
+
+ INIT_LIST_HEAD(&dma->channels);
+ dma->chancnt = readb(ioat_dma->reg_base + IOAT_CHANCNT_OFFSET);
+ dma->chancnt &= 0x1f; /* bits [4:0] valid */
+ if (dma->chancnt > ARRAY_SIZE(ioat_dma->idx)) {
+ dev_warn(dev, "(%d) exceeds max supported channels (%zu)\n",
+ dma->chancnt, ARRAY_SIZE(ioat_dma->idx));
+ dma->chancnt = ARRAY_SIZE(ioat_dma->idx);
+ }
+ xfercap_log = readb(ioat_dma->reg_base + IOAT_XFERCAP_OFFSET);
+ xfercap_log &= 0x1f; /* bits [4:0] valid */
+ if (xfercap_log == 0)
+ return;
+ dev_dbg(dev, "%s: xfercap = %d\n", __func__, 1 << xfercap_log);
+
+ for (i = 0; i < dma->chancnt; i++) {
+ ioat_chan = kzalloc(sizeof(*ioat_chan), GFP_KERNEL);
+ if (!ioat_chan)
+ break;
+
+ ioat_init_channel(ioat_dma, ioat_chan, i);
+ ioat_chan->xfercap_log = xfercap_log;
+ spin_lock_init(&ioat_chan->prep_lock);
+ if (ioat_reset_hw(ioat_chan)) {
+ i = 0;
+ break;
+ }
+ }
+ dma->chancnt = i;
+}
+
+/**
+ * ioat_free_chan_resources - release all the descriptors
+ * @c: the channel to be cleaned
+ */
+static void ioat_free_chan_resources(struct dma_chan *c)
+{
+ struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
+ struct ioatdma_device *ioat_dma = ioat_chan->ioat_dma;
+ struct ioat_ring_ent *desc;
+ const int total_descs = 1 << ioat_chan->alloc_order;
+ int descs;
+ int i;
+
+ /* Before freeing channel resources first check
+ * if they have been previously allocated for this channel.
+ */
+ if (!ioat_chan->ring)
+ return;
+
+ ioat_stop(ioat_chan);
+
+ if (!test_bit(IOAT_CHAN_DOWN, &ioat_chan->state)) {
+ ioat_reset_hw(ioat_chan);
+
+ /* Put LTR to idle */
+ if (ioat_dma->version >= IOAT_VER_3_4)
+ writeb(IOAT_CHAN_LTR_SWSEL_IDLE,
+ ioat_chan->reg_base +
+ IOAT_CHAN_LTR_SWSEL_OFFSET);
+ }
+
+ spin_lock_bh(&ioat_chan->cleanup_lock);
+ spin_lock_bh(&ioat_chan->prep_lock);
+ descs = ioat_ring_space(ioat_chan);
+ dev_dbg(to_dev(ioat_chan), "freeing %d idle descriptors\n", descs);
+ for (i = 0; i < descs; i++) {
+ desc = ioat_get_ring_ent(ioat_chan, ioat_chan->head + i);
+ ioat_free_ring_ent(desc, c);
+ }
+
+ if (descs < total_descs)
+ dev_err(to_dev(ioat_chan), "Freeing %d in use descriptors!\n",
+ total_descs - descs);
+
+ for (i = 0; i < total_descs - descs; i++) {
+ desc = ioat_get_ring_ent(ioat_chan, ioat_chan->tail + i);
+ dump_desc_dbg(ioat_chan, desc);
+ ioat_free_ring_ent(desc, c);
+ }
+
+ for (i = 0; i < ioat_chan->desc_chunks; i++) {
+ dma_free_coherent(to_dev(ioat_chan), IOAT_CHUNK_SIZE,
+ ioat_chan->descs[i].virt,
+ ioat_chan->descs[i].hw);
+ ioat_chan->descs[i].virt = NULL;
+ ioat_chan->descs[i].hw = 0;
+ }
+ ioat_chan->desc_chunks = 0;
+
+ kfree(ioat_chan->ring);
+ ioat_chan->ring = NULL;
+ ioat_chan->alloc_order = 0;
+ dma_pool_free(ioat_dma->completion_pool, ioat_chan->completion,
+ ioat_chan->completion_dma);
+ spin_unlock_bh(&ioat_chan->prep_lock);
+ spin_unlock_bh(&ioat_chan->cleanup_lock);
+
+ ioat_chan->last_completion = 0;
+ ioat_chan->completion_dma = 0;
+ ioat_chan->dmacount = 0;
+}
+
+/* ioat_alloc_chan_resources - allocate/initialize ioat descriptor ring
+ * @chan: channel to be initialized
+ */
+static int ioat_alloc_chan_resources(struct dma_chan *c)
+{
+ struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
+ struct ioat_ring_ent **ring;
+ u64 status;
+ int order;
+ int i = 0;
+ u32 chanerr;
+
+ /* have we already been set up? */
+ if (ioat_chan->ring)
+ return 1 << ioat_chan->alloc_order;
+
+ /* Setup register to interrupt and write completion status on error */
+ writew(IOAT_CHANCTRL_RUN, ioat_chan->reg_base + IOAT_CHANCTRL_OFFSET);
+
+ /* allocate a completion writeback area */
+ /* doing 2 32bit writes to mmio since 1 64b write doesn't work */
+ ioat_chan->completion =
+ dma_pool_zalloc(ioat_chan->ioat_dma->completion_pool,
+ GFP_NOWAIT, &ioat_chan->completion_dma);
+ if (!ioat_chan->completion)
+ return -ENOMEM;
+
+ writel(((u64)ioat_chan->completion_dma) & 0x00000000FFFFFFFF,
+ ioat_chan->reg_base + IOAT_CHANCMP_OFFSET_LOW);
+ writel(((u64)ioat_chan->completion_dma) >> 32,
+ ioat_chan->reg_base + IOAT_CHANCMP_OFFSET_HIGH);
+
+ order = IOAT_MAX_ORDER;
+ ring = ioat_alloc_ring(c, order, GFP_NOWAIT);
+ if (!ring)
+ return -ENOMEM;
+
+ spin_lock_bh(&ioat_chan->cleanup_lock);
+ spin_lock_bh(&ioat_chan->prep_lock);
+ ioat_chan->ring = ring;
+ ioat_chan->head = 0;
+ ioat_chan->issued = 0;
+ ioat_chan->tail = 0;
+ ioat_chan->alloc_order = order;
+ set_bit(IOAT_RUN, &ioat_chan->state);
+ spin_unlock_bh(&ioat_chan->prep_lock);
+ spin_unlock_bh(&ioat_chan->cleanup_lock);
+
+ /* Setting up LTR values for 3.4 or later */
+ if (ioat_chan->ioat_dma->version >= IOAT_VER_3_4) {
+ u32 lat_val;
+
+ lat_val = IOAT_CHAN_LTR_ACTIVE_SNVAL |
+ IOAT_CHAN_LTR_ACTIVE_SNLATSCALE |
+ IOAT_CHAN_LTR_ACTIVE_SNREQMNT;
+ writel(lat_val, ioat_chan->reg_base +
+ IOAT_CHAN_LTR_ACTIVE_OFFSET);
+
+ lat_val = IOAT_CHAN_LTR_IDLE_SNVAL |
+ IOAT_CHAN_LTR_IDLE_SNLATSCALE |
+ IOAT_CHAN_LTR_IDLE_SNREQMNT;
+ writel(lat_val, ioat_chan->reg_base +
+ IOAT_CHAN_LTR_IDLE_OFFSET);
+
+ /* Select to active */
+ writeb(IOAT_CHAN_LTR_SWSEL_ACTIVE,
+ ioat_chan->reg_base +
+ IOAT_CHAN_LTR_SWSEL_OFFSET);
+ }
+
+ ioat_start_null_desc(ioat_chan);
+
+ /* check that we got off the ground */
+ do {
+ udelay(1);
+ status = ioat_chansts(ioat_chan);
+ } while (i++ < 20 && !is_ioat_active(status) && !is_ioat_idle(status));
+
+ if (is_ioat_active(status) || is_ioat_idle(status))
+ return 1 << ioat_chan->alloc_order;
+
+ chanerr = readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
+
+ dev_WARN(to_dev(ioat_chan),
+ "failed to start channel chanerr: %#x\n", chanerr);
+ ioat_free_chan_resources(c);
+ return -EFAULT;
+}
+
+/* common channel initialization */
+static void
+ioat_init_channel(struct ioatdma_device *ioat_dma,
+ struct ioatdma_chan *ioat_chan, int idx)
+{
+ struct dma_device *dma = &ioat_dma->dma_dev;
+
+ ioat_chan->ioat_dma = ioat_dma;
+ ioat_chan->reg_base = ioat_dma->reg_base + (0x80 * (idx + 1));
+ spin_lock_init(&ioat_chan->cleanup_lock);
+ ioat_chan->dma_chan.device = dma;
+ dma_cookie_init(&ioat_chan->dma_chan);
+ list_add_tail(&ioat_chan->dma_chan.device_node, &dma->channels);
+ ioat_dma->idx[idx] = ioat_chan;
+ timer_setup(&ioat_chan->timer, ioat_timer_event, 0);
+ tasklet_setup(&ioat_chan->cleanup_task, ioat_cleanup_event);
+}
+
+#define IOAT_NUM_SRC_TEST 6 /* must be <= 8 */
+static int ioat_xor_val_self_test(struct ioatdma_device *ioat_dma)
+{
+ int i, src_idx;
+ struct page *dest;
+ struct page *xor_srcs[IOAT_NUM_SRC_TEST];
+ struct page *xor_val_srcs[IOAT_NUM_SRC_TEST + 1];
+ dma_addr_t dma_srcs[IOAT_NUM_SRC_TEST + 1];
+ dma_addr_t dest_dma;
+ struct dma_async_tx_descriptor *tx;
+ struct dma_chan *dma_chan;
+ dma_cookie_t cookie;
+ u8 cmp_byte = 0;
+ u32 cmp_word;
+ u32 xor_val_result;
+ int err = 0;
+ struct completion cmp;
+ unsigned long tmo;
+ struct device *dev = &ioat_dma->pdev->dev;
+ struct dma_device *dma = &ioat_dma->dma_dev;
+ u8 op = 0;
+
+ dev_dbg(dev, "%s\n", __func__);
+
+ if (!dma_has_cap(DMA_XOR, dma->cap_mask))
+ return 0;
+
+ for (src_idx = 0; src_idx < IOAT_NUM_SRC_TEST; src_idx++) {
+ xor_srcs[src_idx] = alloc_page(GFP_KERNEL);
+ if (!xor_srcs[src_idx]) {
+ while (src_idx--)
+ __free_page(xor_srcs[src_idx]);
+ return -ENOMEM;
+ }
+ }
+
+ dest = alloc_page(GFP_KERNEL);
+ if (!dest) {
+ while (src_idx--)
+ __free_page(xor_srcs[src_idx]);
+ return -ENOMEM;
+ }
+
+ /* Fill in src buffers */
+ for (src_idx = 0; src_idx < IOAT_NUM_SRC_TEST; src_idx++) {
+ u8 *ptr = page_address(xor_srcs[src_idx]);
+
+ for (i = 0; i < PAGE_SIZE; i++)
+ ptr[i] = (1 << src_idx);
+ }
+
+ for (src_idx = 0; src_idx < IOAT_NUM_SRC_TEST; src_idx++)
+ cmp_byte ^= (u8) (1 << src_idx);
+
+ cmp_word = (cmp_byte << 24) | (cmp_byte << 16) |
+ (cmp_byte << 8) | cmp_byte;
+
+ memset(page_address(dest), 0, PAGE_SIZE);
+
+ dma_chan = container_of(dma->channels.next, struct dma_chan,
+ device_node);
+ if (dma->device_alloc_chan_resources(dma_chan) < 1) {
+ err = -ENODEV;
+ goto out;
+ }
+
+ /* test xor */
+ op = IOAT_OP_XOR;
+
+ dest_dma = dma_map_page(dev, dest, 0, PAGE_SIZE, DMA_FROM_DEVICE);
+ if (dma_mapping_error(dev, dest_dma)) {
+ err = -ENOMEM;
+ goto free_resources;
+ }
+
+ for (i = 0; i < IOAT_NUM_SRC_TEST; i++) {
+ dma_srcs[i] = dma_map_page(dev, xor_srcs[i], 0, PAGE_SIZE,
+ DMA_TO_DEVICE);
+ if (dma_mapping_error(dev, dma_srcs[i])) {
+ err = -ENOMEM;
+ goto dma_unmap;
+ }
+ }
+ tx = dma->device_prep_dma_xor(dma_chan, dest_dma, dma_srcs,
+ IOAT_NUM_SRC_TEST, PAGE_SIZE,
+ DMA_PREP_INTERRUPT);
+
+ if (!tx) {
+ dev_err(dev, "Self-test xor prep failed\n");
+ err = -ENODEV;
+ goto dma_unmap;
+ }
+
+ async_tx_ack(tx);
+ init_completion(&cmp);
+ tx->callback = ioat_dma_test_callback;
+ tx->callback_param = &cmp;
+ cookie = tx->tx_submit(tx);
+ if (cookie < 0) {
+ dev_err(dev, "Self-test xor setup failed\n");
+ err = -ENODEV;
+ goto dma_unmap;
+ }
+ dma->device_issue_pending(dma_chan);
+
+ tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000));
+
+ if (tmo == 0 ||
+ dma->device_tx_status(dma_chan, cookie, NULL) != DMA_COMPLETE) {
+ dev_err(dev, "Self-test xor timed out\n");
+ err = -ENODEV;
+ goto dma_unmap;
+ }
+
+ for (i = 0; i < IOAT_NUM_SRC_TEST; i++)
+ dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE, DMA_TO_DEVICE);
+
+ dma_sync_single_for_cpu(dev, dest_dma, PAGE_SIZE, DMA_FROM_DEVICE);
+ for (i = 0; i < (PAGE_SIZE / sizeof(u32)); i++) {
+ u32 *ptr = page_address(dest);
+
+ if (ptr[i] != cmp_word) {
+ dev_err(dev, "Self-test xor failed compare\n");
+ err = -ENODEV;
+ goto free_resources;
+ }
+ }
+ dma_sync_single_for_device(dev, dest_dma, PAGE_SIZE, DMA_FROM_DEVICE);
+
+ dma_unmap_page(dev, dest_dma, PAGE_SIZE, DMA_FROM_DEVICE);
+
+ /* skip validate if the capability is not present */
+ if (!dma_has_cap(DMA_XOR_VAL, dma_chan->device->cap_mask))
+ goto free_resources;
+
+ op = IOAT_OP_XOR_VAL;
+
+ /* validate the sources with the destintation page */
+ for (i = 0; i < IOAT_NUM_SRC_TEST; i++)
+ xor_val_srcs[i] = xor_srcs[i];
+ xor_val_srcs[i] = dest;
+
+ xor_val_result = 1;
+
+ for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) {
+ dma_srcs[i] = dma_map_page(dev, xor_val_srcs[i], 0, PAGE_SIZE,
+ DMA_TO_DEVICE);
+ if (dma_mapping_error(dev, dma_srcs[i])) {
+ err = -ENOMEM;
+ goto dma_unmap;
+ }
+ }
+ tx = dma->device_prep_dma_xor_val(dma_chan, dma_srcs,
+ IOAT_NUM_SRC_TEST + 1, PAGE_SIZE,
+ &xor_val_result, DMA_PREP_INTERRUPT);
+ if (!tx) {
+ dev_err(dev, "Self-test zero prep failed\n");
+ err = -ENODEV;
+ goto dma_unmap;
+ }
+
+ async_tx_ack(tx);
+ init_completion(&cmp);
+ tx->callback = ioat_dma_test_callback;
+ tx->callback_param = &cmp;
+ cookie = tx->tx_submit(tx);
+ if (cookie < 0) {
+ dev_err(dev, "Self-test zero setup failed\n");
+ err = -ENODEV;
+ goto dma_unmap;
+ }
+ dma->device_issue_pending(dma_chan);
+
+ tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000));
+
+ if (tmo == 0 ||
+ dma->device_tx_status(dma_chan, cookie, NULL) != DMA_COMPLETE) {
+ dev_err(dev, "Self-test validate timed out\n");
+ err = -ENODEV;
+ goto dma_unmap;
+ }
+
+ for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++)
+ dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE, DMA_TO_DEVICE);
+
+ if (xor_val_result != 0) {
+ dev_err(dev, "Self-test validate failed compare\n");
+ err = -ENODEV;
+ goto free_resources;
+ }
+
+ memset(page_address(dest), 0, PAGE_SIZE);
+
+ /* test for non-zero parity sum */
+ op = IOAT_OP_XOR_VAL;
+
+ xor_val_result = 0;
+ for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) {
+ dma_srcs[i] = dma_map_page(dev, xor_val_srcs[i], 0, PAGE_SIZE,
+ DMA_TO_DEVICE);
+ if (dma_mapping_error(dev, dma_srcs[i])) {
+ err = -ENOMEM;
+ goto dma_unmap;
+ }
+ }
+ tx = dma->device_prep_dma_xor_val(dma_chan, dma_srcs,
+ IOAT_NUM_SRC_TEST + 1, PAGE_SIZE,
+ &xor_val_result, DMA_PREP_INTERRUPT);
+ if (!tx) {
+ dev_err(dev, "Self-test 2nd zero prep failed\n");
+ err = -ENODEV;
+ goto dma_unmap;
+ }
+
+ async_tx_ack(tx);
+ init_completion(&cmp);
+ tx->callback = ioat_dma_test_callback;
+ tx->callback_param = &cmp;
+ cookie = tx->tx_submit(tx);
+ if (cookie < 0) {
+ dev_err(dev, "Self-test 2nd zero setup failed\n");
+ err = -ENODEV;
+ goto dma_unmap;
+ }
+ dma->device_issue_pending(dma_chan);
+
+ tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000));
+
+ if (tmo == 0 ||
+ dma->device_tx_status(dma_chan, cookie, NULL) != DMA_COMPLETE) {
+ dev_err(dev, "Self-test 2nd validate timed out\n");
+ err = -ENODEV;
+ goto dma_unmap;
+ }
+
+ if (xor_val_result != SUM_CHECK_P_RESULT) {
+ dev_err(dev, "Self-test validate failed compare\n");
+ err = -ENODEV;
+ goto dma_unmap;
+ }
+
+ for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++)
+ dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE, DMA_TO_DEVICE);
+
+ goto free_resources;
+dma_unmap:
+ if (op == IOAT_OP_XOR) {
+ while (--i >= 0)
+ dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE,
+ DMA_TO_DEVICE);
+ dma_unmap_page(dev, dest_dma, PAGE_SIZE, DMA_FROM_DEVICE);
+ } else if (op == IOAT_OP_XOR_VAL) {
+ while (--i >= 0)
+ dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE,
+ DMA_TO_DEVICE);
+ }
+free_resources:
+ dma->device_free_chan_resources(dma_chan);
+out:
+ src_idx = IOAT_NUM_SRC_TEST;
+ while (src_idx--)
+ __free_page(xor_srcs[src_idx]);
+ __free_page(dest);
+ return err;
+}
+
+static int ioat3_dma_self_test(struct ioatdma_device *ioat_dma)
+{
+ int rc;
+
+ rc = ioat_dma_self_test(ioat_dma);
+ if (rc)
+ return rc;
+
+ rc = ioat_xor_val_self_test(ioat_dma);
+
+ return rc;
+}
+
+static void ioat_intr_quirk(struct ioatdma_device *ioat_dma)
+{
+ struct dma_device *dma;
+ struct dma_chan *c;
+ struct ioatdma_chan *ioat_chan;
+ u32 errmask;
+
+ dma = &ioat_dma->dma_dev;
+
+ /*
+ * if we have descriptor write back error status, we mask the
+ * error interrupts
+ */
+ if (ioat_dma->cap & IOAT_CAP_DWBES) {
+ list_for_each_entry(c, &dma->channels, device_node) {
+ ioat_chan = to_ioat_chan(c);
+ errmask = readl(ioat_chan->reg_base +
+ IOAT_CHANERR_MASK_OFFSET);
+ errmask |= IOAT_CHANERR_XOR_P_OR_CRC_ERR |
+ IOAT_CHANERR_XOR_Q_ERR;
+ writel(errmask, ioat_chan->reg_base +
+ IOAT_CHANERR_MASK_OFFSET);
+ }
+ }
+}
+
+static int ioat3_dma_probe(struct ioatdma_device *ioat_dma, int dca)
+{
+ struct pci_dev *pdev = ioat_dma->pdev;
+ int dca_en = system_has_dca_enabled(pdev);
+ struct dma_device *dma;
+ struct dma_chan *c;
+ struct ioatdma_chan *ioat_chan;
+ int err;
+ u16 val16;
+
+ dma = &ioat_dma->dma_dev;
+ dma->device_prep_dma_memcpy = ioat_dma_prep_memcpy_lock;
+ dma->device_issue_pending = ioat_issue_pending;
+ dma->device_alloc_chan_resources = ioat_alloc_chan_resources;
+ dma->device_free_chan_resources = ioat_free_chan_resources;
+
+ dma_cap_set(DMA_INTERRUPT, dma->cap_mask);
+ dma->device_prep_dma_interrupt = ioat_prep_interrupt_lock;
+
+ ioat_dma->cap = readl(ioat_dma->reg_base + IOAT_DMA_CAP_OFFSET);
+
+ if (is_xeon_cb32(pdev) || is_bwd_noraid(pdev))
+ ioat_dma->cap &=
+ ~(IOAT_CAP_XOR | IOAT_CAP_PQ | IOAT_CAP_RAID16SS);
+
+ /* dca is incompatible with raid operations */
+ if (dca_en && (ioat_dma->cap & (IOAT_CAP_XOR|IOAT_CAP_PQ)))
+ ioat_dma->cap &= ~(IOAT_CAP_XOR|IOAT_CAP_PQ);
+
+ if (ioat_dma->cap & IOAT_CAP_XOR) {
+ dma->max_xor = 8;
+
+ dma_cap_set(DMA_XOR, dma->cap_mask);
+ dma->device_prep_dma_xor = ioat_prep_xor;
+
+ dma_cap_set(DMA_XOR_VAL, dma->cap_mask);
+ dma->device_prep_dma_xor_val = ioat_prep_xor_val;
+ }
+
+ if (ioat_dma->cap & IOAT_CAP_PQ) {
+
+ dma->device_prep_dma_pq = ioat_prep_pq;
+ dma->device_prep_dma_pq_val = ioat_prep_pq_val;
+ dma_cap_set(DMA_PQ, dma->cap_mask);
+ dma_cap_set(DMA_PQ_VAL, dma->cap_mask);
+
+ if (ioat_dma->cap & IOAT_CAP_RAID16SS)
+ dma_set_maxpq(dma, 16, 0);
+ else
+ dma_set_maxpq(dma, 8, 0);
+
+ if (!(ioat_dma->cap & IOAT_CAP_XOR)) {
+ dma->device_prep_dma_xor = ioat_prep_pqxor;
+ dma->device_prep_dma_xor_val = ioat_prep_pqxor_val;
+ dma_cap_set(DMA_XOR, dma->cap_mask);
+ dma_cap_set(DMA_XOR_VAL, dma->cap_mask);
+
+ if (ioat_dma->cap & IOAT_CAP_RAID16SS)
+ dma->max_xor = 16;
+ else
+ dma->max_xor = 8;
+ }
+ }
+
+ dma->device_tx_status = ioat_tx_status;
+
+ /* starting with CB3.3 super extended descriptors are supported */
+ if (ioat_dma->cap & IOAT_CAP_RAID16SS) {
+ char pool_name[14];
+ int i;
+
+ for (i = 0; i < MAX_SED_POOLS; i++) {
+ snprintf(pool_name, 14, "ioat_hw%d_sed", i);
+
+ /* allocate SED DMA pool */
+ ioat_dma->sed_hw_pool[i] = dmam_pool_create(pool_name,
+ &pdev->dev,
+ SED_SIZE * (i + 1), 64, 0);
+ if (!ioat_dma->sed_hw_pool[i])
+ return -ENOMEM;
+
+ }
+ }
+
+ if (!(ioat_dma->cap & (IOAT_CAP_XOR | IOAT_CAP_PQ)))
+ dma_cap_set(DMA_PRIVATE, dma->cap_mask);
+
+ err = ioat_probe(ioat_dma);
+ if (err)
+ return err;
+
+ list_for_each_entry(c, &dma->channels, device_node) {
+ ioat_chan = to_ioat_chan(c);
+ writel(IOAT_DMA_DCA_ANY_CPU,
+ ioat_chan->reg_base + IOAT_DCACTRL_OFFSET);
+ }
+
+ err = ioat_register(ioat_dma);
+ if (err)
+ return err;
+
+ ioat_kobject_add(ioat_dma, &ioat_ktype);
+
+ if (dca)
+ ioat_dma->dca = ioat_dca_init(pdev, ioat_dma->reg_base);
+
+ /* disable relaxed ordering */
+ err = pcie_capability_read_word(pdev, IOAT_DEVCTRL_OFFSET, &val16);
+ if (err)
+ return pcibios_err_to_errno(err);
+
+ /* clear relaxed ordering enable */
+ val16 &= ~IOAT_DEVCTRL_ROE;
+ err = pcie_capability_write_word(pdev, IOAT_DEVCTRL_OFFSET, val16);
+ if (err)
+ return pcibios_err_to_errno(err);
+
+ if (ioat_dma->cap & IOAT_CAP_DPS)
+ writeb(ioat_pending_level + 1,
+ ioat_dma->reg_base + IOAT_PREFETCH_LIMIT_OFFSET);
+
+ return 0;
+}
+
+static void ioat_shutdown(struct pci_dev *pdev)
+{
+ struct ioatdma_device *ioat_dma = pci_get_drvdata(pdev);
+ struct ioatdma_chan *ioat_chan;
+ int i;
+
+ if (!ioat_dma)
+ return;
+
+ for (i = 0; i < IOAT_MAX_CHANS; i++) {
+ ioat_chan = ioat_dma->idx[i];
+ if (!ioat_chan)
+ continue;
+
+ spin_lock_bh(&ioat_chan->prep_lock);
+ set_bit(IOAT_CHAN_DOWN, &ioat_chan->state);
+ spin_unlock_bh(&ioat_chan->prep_lock);
+ /*
+ * Synchronization rule for del_timer_sync():
+ * - The caller must not hold locks which would prevent
+ * completion of the timer's handler.
+ * So prep_lock cannot be held before calling it.
+ */
+ del_timer_sync(&ioat_chan->timer);
+
+ /* this should quiesce then reset */
+ ioat_reset_hw(ioat_chan);
+ }
+
+ ioat_disable_interrupts(ioat_dma);
+}
+
+static void ioat_resume(struct ioatdma_device *ioat_dma)
+{
+ struct ioatdma_chan *ioat_chan;
+ u32 chanerr;
+ int i;
+
+ for (i = 0; i < IOAT_MAX_CHANS; i++) {
+ ioat_chan = ioat_dma->idx[i];
+ if (!ioat_chan)
+ continue;
+
+ spin_lock_bh(&ioat_chan->prep_lock);
+ clear_bit(IOAT_CHAN_DOWN, &ioat_chan->state);
+ spin_unlock_bh(&ioat_chan->prep_lock);
+
+ chanerr = readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
+ writel(chanerr, ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
+
+ /* no need to reset as shutdown already did that */
+ }
+}
+
+#define DRV_NAME "ioatdma"
+
+static pci_ers_result_t ioat_pcie_error_detected(struct pci_dev *pdev,
+ pci_channel_state_t error)
+{
+ dev_dbg(&pdev->dev, "%s: PCIe AER error %d\n", DRV_NAME, error);
+
+ /* quiesce and block I/O */
+ ioat_shutdown(pdev);
+
+ return PCI_ERS_RESULT_NEED_RESET;
+}
+
+static pci_ers_result_t ioat_pcie_error_slot_reset(struct pci_dev *pdev)
+{
+ pci_ers_result_t result = PCI_ERS_RESULT_RECOVERED;
+
+ dev_dbg(&pdev->dev, "%s post reset handling\n", DRV_NAME);
+
+ if (pci_enable_device_mem(pdev) < 0) {
+ dev_err(&pdev->dev,
+ "Failed to enable PCIe device after reset.\n");
+ result = PCI_ERS_RESULT_DISCONNECT;
+ } else {
+ pci_set_master(pdev);
+ pci_restore_state(pdev);
+ pci_save_state(pdev);
+ pci_wake_from_d3(pdev, false);
+ }
+
+ return result;
+}
+
+static void ioat_pcie_error_resume(struct pci_dev *pdev)
+{
+ struct ioatdma_device *ioat_dma = pci_get_drvdata(pdev);
+
+ dev_dbg(&pdev->dev, "%s: AER handling resuming\n", DRV_NAME);
+
+ /* initialize and bring everything back */
+ ioat_resume(ioat_dma);
+}
+
+static const struct pci_error_handlers ioat_err_handler = {
+ .error_detected = ioat_pcie_error_detected,
+ .slot_reset = ioat_pcie_error_slot_reset,
+ .resume = ioat_pcie_error_resume,
+};
+
+static struct pci_driver ioat_pci_driver = {
+ .name = DRV_NAME,
+ .id_table = ioat_pci_tbl,
+ .probe = ioat_pci_probe,
+ .remove = ioat_remove,
+ .shutdown = ioat_shutdown,
+ .err_handler = &ioat_err_handler,
+};
+
+static void release_ioatdma(struct dma_device *device)
+{
+ struct ioatdma_device *d = to_ioatdma_device(device);
+ int i;
+
+ for (i = 0; i < IOAT_MAX_CHANS; i++)
+ kfree(d->idx[i]);
+
+ dma_pool_destroy(d->completion_pool);
+ kfree(d);
+}
+
+static struct ioatdma_device *
+alloc_ioatdma(struct pci_dev *pdev, void __iomem *iobase)
+{
+ struct ioatdma_device *d = kzalloc(sizeof(*d), GFP_KERNEL);
+
+ if (!d)
+ return NULL;
+ d->pdev = pdev;
+ d->reg_base = iobase;
+ d->dma_dev.device_release = release_ioatdma;
+ return d;
+}
+
+static int ioat_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+ void __iomem * const *iomap;
+ struct device *dev = &pdev->dev;
+ struct ioatdma_device *device;
+ int err;
+
+ err = pcim_enable_device(pdev);
+ if (err)
+ return err;
+
+ err = pcim_iomap_regions(pdev, 1 << IOAT_MMIO_BAR, DRV_NAME);
+ if (err)
+ return err;
+ iomap = pcim_iomap_table(pdev);
+ if (!iomap)
+ return -ENOMEM;
+
+ err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
+ if (err)
+ return err;
+
+ device = alloc_ioatdma(pdev, iomap[IOAT_MMIO_BAR]);
+ if (!device)
+ return -ENOMEM;
+ pci_set_master(pdev);
+ pci_set_drvdata(pdev, device);
+
+ device->version = readb(device->reg_base + IOAT_VER_OFFSET);
+ if (device->version >= IOAT_VER_3_4)
+ ioat_dca_enabled = 0;
+ if (device->version >= IOAT_VER_3_0) {
+ if (is_skx_ioat(pdev))
+ device->version = IOAT_VER_3_2;
+ err = ioat3_dma_probe(device, ioat_dca_enabled);
+
+ if (device->version >= IOAT_VER_3_3)
+ pci_enable_pcie_error_reporting(pdev);
+ } else
+ return -ENODEV;
+
+ if (err) {
+ dev_err(dev, "Intel(R) I/OAT DMA Engine init failed\n");
+ pci_disable_pcie_error_reporting(pdev);
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static void ioat_remove(struct pci_dev *pdev)
+{
+ struct ioatdma_device *device = pci_get_drvdata(pdev);
+
+ if (!device)
+ return;
+
+ ioat_shutdown(pdev);
+
+ dev_err(&pdev->dev, "Removing dma and dca services\n");
+ if (device->dca) {
+ unregister_dca_provider(device->dca, &pdev->dev);
+ free_dca_provider(device->dca);
+ device->dca = NULL;
+ }
+
+ pci_disable_pcie_error_reporting(pdev);
+ ioat_dma_remove(device);
+}
+
+static int __init ioat_init_module(void)
+{
+ int err = -ENOMEM;
+
+ pr_info("%s: Intel(R) QuickData Technology Driver %s\n",
+ DRV_NAME, IOAT_DMA_VERSION);
+
+ ioat_cache = kmem_cache_create("ioat", sizeof(struct ioat_ring_ent),
+ 0, SLAB_HWCACHE_ALIGN, NULL);
+ if (!ioat_cache)
+ return -ENOMEM;
+
+ ioat_sed_cache = KMEM_CACHE(ioat_sed_ent, 0);
+ if (!ioat_sed_cache)
+ goto err_ioat_cache;
+
+ err = pci_register_driver(&ioat_pci_driver);
+ if (err)
+ goto err_ioat3_cache;
+
+ return 0;
+
+ err_ioat3_cache:
+ kmem_cache_destroy(ioat_sed_cache);
+
+ err_ioat_cache:
+ kmem_cache_destroy(ioat_cache);
+
+ return err;
+}
+module_init(ioat_init_module);
+
+static void __exit ioat_exit_module(void)
+{
+ pci_unregister_driver(&ioat_pci_driver);
+ kmem_cache_destroy(ioat_cache);
+}
+module_exit(ioat_exit_module);
diff --git a/drivers/dma/ioat/prep.c b/drivers/dma/ioat/prep.c
new file mode 100644
index 000000000..033d9f2b3
--- /dev/null
+++ b/drivers/dma/ioat/prep.c
@@ -0,0 +1,737 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Intel I/OAT DMA Linux driver
+ * Copyright(c) 2004 - 2015 Intel Corporation.
+ */
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/gfp.h>
+#include <linux/dmaengine.h>
+#include <linux/dma-mapping.h>
+#include <linux/prefetch.h>
+#include "../dmaengine.h"
+#include "registers.h"
+#include "hw.h"
+#include "dma.h"
+
+#define MAX_SCF 256
+
+/* provide a lookup table for setting the source address in the base or
+ * extended descriptor of an xor or pq descriptor
+ */
+static const u8 xor_idx_to_desc = 0xe0;
+static const u8 xor_idx_to_field[] = { 1, 4, 5, 6, 7, 0, 1, 2 };
+static const u8 pq_idx_to_desc = 0xf8;
+static const u8 pq16_idx_to_desc[] = { 0, 0, 1, 1, 1, 1, 1, 1, 1,
+ 2, 2, 2, 2, 2, 2, 2 };
+static const u8 pq_idx_to_field[] = { 1, 4, 5, 0, 1, 2, 4, 5 };
+static const u8 pq16_idx_to_field[] = { 1, 4, 1, 2, 3, 4, 5, 6, 7,
+ 0, 1, 2, 3, 4, 5, 6 };
+
+static void xor_set_src(struct ioat_raw_descriptor *descs[2],
+ dma_addr_t addr, u32 offset, int idx)
+{
+ struct ioat_raw_descriptor *raw = descs[xor_idx_to_desc >> idx & 1];
+
+ raw->field[xor_idx_to_field[idx]] = addr + offset;
+}
+
+static dma_addr_t pq_get_src(struct ioat_raw_descriptor *descs[2], int idx)
+{
+ struct ioat_raw_descriptor *raw = descs[pq_idx_to_desc >> idx & 1];
+
+ return raw->field[pq_idx_to_field[idx]];
+}
+
+static dma_addr_t pq16_get_src(struct ioat_raw_descriptor *desc[3], int idx)
+{
+ struct ioat_raw_descriptor *raw = desc[pq16_idx_to_desc[idx]];
+
+ return raw->field[pq16_idx_to_field[idx]];
+}
+
+static void pq_set_src(struct ioat_raw_descriptor *descs[2],
+ dma_addr_t addr, u32 offset, u8 coef, int idx)
+{
+ struct ioat_pq_descriptor *pq = (struct ioat_pq_descriptor *) descs[0];
+ struct ioat_raw_descriptor *raw = descs[pq_idx_to_desc >> idx & 1];
+
+ raw->field[pq_idx_to_field[idx]] = addr + offset;
+ pq->coef[idx] = coef;
+}
+
+static void pq16_set_src(struct ioat_raw_descriptor *desc[3],
+ dma_addr_t addr, u32 offset, u8 coef, unsigned idx)
+{
+ struct ioat_pq_descriptor *pq = (struct ioat_pq_descriptor *)desc[0];
+ struct ioat_pq16a_descriptor *pq16 =
+ (struct ioat_pq16a_descriptor *)desc[1];
+ struct ioat_raw_descriptor *raw = desc[pq16_idx_to_desc[idx]];
+
+ raw->field[pq16_idx_to_field[idx]] = addr + offset;
+
+ if (idx < 8)
+ pq->coef[idx] = coef;
+ else
+ pq16->coef[idx - 8] = coef;
+}
+
+static struct ioat_sed_ent *
+ioat3_alloc_sed(struct ioatdma_device *ioat_dma, unsigned int hw_pool)
+{
+ struct ioat_sed_ent *sed;
+ gfp_t flags = __GFP_ZERO | GFP_ATOMIC;
+
+ sed = kmem_cache_alloc(ioat_sed_cache, flags);
+ if (!sed)
+ return NULL;
+
+ sed->hw_pool = hw_pool;
+ sed->hw = dma_pool_alloc(ioat_dma->sed_hw_pool[hw_pool],
+ flags, &sed->dma);
+ if (!sed->hw) {
+ kmem_cache_free(ioat_sed_cache, sed);
+ return NULL;
+ }
+
+ return sed;
+}
+
+struct dma_async_tx_descriptor *
+ioat_dma_prep_memcpy_lock(struct dma_chan *c, dma_addr_t dma_dest,
+ dma_addr_t dma_src, size_t len, unsigned long flags)
+{
+ struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
+ struct ioat_dma_descriptor *hw;
+ struct ioat_ring_ent *desc;
+ dma_addr_t dst = dma_dest;
+ dma_addr_t src = dma_src;
+ size_t total_len = len;
+ int num_descs, idx, i;
+
+ if (test_bit(IOAT_CHAN_DOWN, &ioat_chan->state))
+ return NULL;
+
+ num_descs = ioat_xferlen_to_descs(ioat_chan, len);
+ if (likely(num_descs) &&
+ ioat_check_space_lock(ioat_chan, num_descs) == 0)
+ idx = ioat_chan->head;
+ else
+ return NULL;
+ i = 0;
+ do {
+ size_t copy = min_t(size_t, len, 1 << ioat_chan->xfercap_log);
+
+ desc = ioat_get_ring_ent(ioat_chan, idx + i);
+ hw = desc->hw;
+
+ hw->size = copy;
+ hw->ctl = 0;
+ hw->src_addr = src;
+ hw->dst_addr = dst;
+
+ len -= copy;
+ dst += copy;
+ src += copy;
+ dump_desc_dbg(ioat_chan, desc);
+ } while (++i < num_descs);
+
+ desc->txd.flags = flags;
+ desc->len = total_len;
+ hw->ctl_f.int_en = !!(flags & DMA_PREP_INTERRUPT);
+ hw->ctl_f.fence = !!(flags & DMA_PREP_FENCE);
+ hw->ctl_f.compl_write = 1;
+ dump_desc_dbg(ioat_chan, desc);
+ /* we leave the channel locked to ensure in order submission */
+
+ return &desc->txd;
+}
+
+
+static struct dma_async_tx_descriptor *
+__ioat_prep_xor_lock(struct dma_chan *c, enum sum_check_flags *result,
+ dma_addr_t dest, dma_addr_t *src, unsigned int src_cnt,
+ size_t len, unsigned long flags)
+{
+ struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
+ struct ioat_ring_ent *compl_desc;
+ struct ioat_ring_ent *desc;
+ struct ioat_ring_ent *ext;
+ size_t total_len = len;
+ struct ioat_xor_descriptor *xor;
+ struct ioat_xor_ext_descriptor *xor_ex = NULL;
+ struct ioat_dma_descriptor *hw;
+ int num_descs, with_ext, idx, i;
+ u32 offset = 0;
+ u8 op = result ? IOAT_OP_XOR_VAL : IOAT_OP_XOR;
+
+ BUG_ON(src_cnt < 2);
+
+ num_descs = ioat_xferlen_to_descs(ioat_chan, len);
+ /* we need 2x the number of descriptors to cover greater than 5
+ * sources
+ */
+ if (src_cnt > 5) {
+ with_ext = 1;
+ num_descs *= 2;
+ } else
+ with_ext = 0;
+
+ /* completion writes from the raid engine may pass completion
+ * writes from the legacy engine, so we need one extra null
+ * (legacy) descriptor to ensure all completion writes arrive in
+ * order.
+ */
+ if (likely(num_descs) &&
+ ioat_check_space_lock(ioat_chan, num_descs+1) == 0)
+ idx = ioat_chan->head;
+ else
+ return NULL;
+ i = 0;
+ do {
+ struct ioat_raw_descriptor *descs[2];
+ size_t xfer_size = min_t(size_t,
+ len, 1 << ioat_chan->xfercap_log);
+ int s;
+
+ desc = ioat_get_ring_ent(ioat_chan, idx + i);
+ xor = desc->xor;
+
+ /* save a branch by unconditionally retrieving the
+ * extended descriptor xor_set_src() knows to not write
+ * to it in the single descriptor case
+ */
+ ext = ioat_get_ring_ent(ioat_chan, idx + i + 1);
+ xor_ex = ext->xor_ex;
+
+ descs[0] = (struct ioat_raw_descriptor *) xor;
+ descs[1] = (struct ioat_raw_descriptor *) xor_ex;
+ for (s = 0; s < src_cnt; s++)
+ xor_set_src(descs, src[s], offset, s);
+ xor->size = xfer_size;
+ xor->dst_addr = dest + offset;
+ xor->ctl = 0;
+ xor->ctl_f.op = op;
+ xor->ctl_f.src_cnt = src_cnt_to_hw(src_cnt);
+
+ len -= xfer_size;
+ offset += xfer_size;
+ dump_desc_dbg(ioat_chan, desc);
+ } while ((i += 1 + with_ext) < num_descs);
+
+ /* last xor descriptor carries the unmap parameters and fence bit */
+ desc->txd.flags = flags;
+ desc->len = total_len;
+ if (result)
+ desc->result = result;
+ xor->ctl_f.fence = !!(flags & DMA_PREP_FENCE);
+
+ /* completion descriptor carries interrupt bit */
+ compl_desc = ioat_get_ring_ent(ioat_chan, idx + i);
+ compl_desc->txd.flags = flags & DMA_PREP_INTERRUPT;
+ hw = compl_desc->hw;
+ hw->ctl = 0;
+ hw->ctl_f.null = 1;
+ hw->ctl_f.int_en = !!(flags & DMA_PREP_INTERRUPT);
+ hw->ctl_f.compl_write = 1;
+ hw->size = NULL_DESC_BUFFER_SIZE;
+ dump_desc_dbg(ioat_chan, compl_desc);
+
+ /* we leave the channel locked to ensure in order submission */
+ return &compl_desc->txd;
+}
+
+struct dma_async_tx_descriptor *
+ioat_prep_xor(struct dma_chan *chan, dma_addr_t dest, dma_addr_t *src,
+ unsigned int src_cnt, size_t len, unsigned long flags)
+{
+ struct ioatdma_chan *ioat_chan = to_ioat_chan(chan);
+
+ if (test_bit(IOAT_CHAN_DOWN, &ioat_chan->state))
+ return NULL;
+
+ return __ioat_prep_xor_lock(chan, NULL, dest, src, src_cnt, len, flags);
+}
+
+struct dma_async_tx_descriptor *
+ioat_prep_xor_val(struct dma_chan *chan, dma_addr_t *src,
+ unsigned int src_cnt, size_t len,
+ enum sum_check_flags *result, unsigned long flags)
+{
+ struct ioatdma_chan *ioat_chan = to_ioat_chan(chan);
+
+ if (test_bit(IOAT_CHAN_DOWN, &ioat_chan->state))
+ return NULL;
+
+ /* the cleanup routine only sets bits on validate failure, it
+ * does not clear bits on validate success... so clear it here
+ */
+ *result = 0;
+
+ return __ioat_prep_xor_lock(chan, result, src[0], &src[1],
+ src_cnt - 1, len, flags);
+}
+
+static void
+dump_pq_desc_dbg(struct ioatdma_chan *ioat_chan, struct ioat_ring_ent *desc,
+ struct ioat_ring_ent *ext)
+{
+ struct device *dev = to_dev(ioat_chan);
+ struct ioat_pq_descriptor *pq = desc->pq;
+ struct ioat_pq_ext_descriptor *pq_ex = ext ? ext->pq_ex : NULL;
+ struct ioat_raw_descriptor *descs[] = { (void *) pq, (void *) pq_ex };
+ int src_cnt = src_cnt_to_sw(pq->ctl_f.src_cnt);
+ int i;
+
+ dev_dbg(dev, "desc[%d]: (%#llx->%#llx) flags: %#x"
+ " sz: %#10.8x ctl: %#x (op: %#x int: %d compl: %d pq: '%s%s'"
+ " src_cnt: %d)\n",
+ desc_id(desc), (unsigned long long) desc->txd.phys,
+ (unsigned long long) (pq_ex ? pq_ex->next : pq->next),
+ desc->txd.flags, pq->size, pq->ctl, pq->ctl_f.op,
+ pq->ctl_f.int_en, pq->ctl_f.compl_write,
+ pq->ctl_f.p_disable ? "" : "p", pq->ctl_f.q_disable ? "" : "q",
+ pq->ctl_f.src_cnt);
+ for (i = 0; i < src_cnt; i++)
+ dev_dbg(dev, "\tsrc[%d]: %#llx coef: %#x\n", i,
+ (unsigned long long) pq_get_src(descs, i), pq->coef[i]);
+ dev_dbg(dev, "\tP: %#llx\n", pq->p_addr);
+ dev_dbg(dev, "\tQ: %#llx\n", pq->q_addr);
+ dev_dbg(dev, "\tNEXT: %#llx\n", pq->next);
+}
+
+static void dump_pq16_desc_dbg(struct ioatdma_chan *ioat_chan,
+ struct ioat_ring_ent *desc)
+{
+ struct device *dev = to_dev(ioat_chan);
+ struct ioat_pq_descriptor *pq = desc->pq;
+ struct ioat_raw_descriptor *descs[] = { (void *)pq,
+ (void *)pq,
+ (void *)pq };
+ int src_cnt = src16_cnt_to_sw(pq->ctl_f.src_cnt);
+ int i;
+
+ if (desc->sed) {
+ descs[1] = (void *)desc->sed->hw;
+ descs[2] = (void *)desc->sed->hw + 64;
+ }
+
+ dev_dbg(dev, "desc[%d]: (%#llx->%#llx) flags: %#x"
+ " sz: %#x ctl: %#x (op: %#x int: %d compl: %d pq: '%s%s'"
+ " src_cnt: %d)\n",
+ desc_id(desc), (unsigned long long) desc->txd.phys,
+ (unsigned long long) pq->next,
+ desc->txd.flags, pq->size, pq->ctl,
+ pq->ctl_f.op, pq->ctl_f.int_en,
+ pq->ctl_f.compl_write,
+ pq->ctl_f.p_disable ? "" : "p", pq->ctl_f.q_disable ? "" : "q",
+ pq->ctl_f.src_cnt);
+ for (i = 0; i < src_cnt; i++) {
+ dev_dbg(dev, "\tsrc[%d]: %#llx coef: %#x\n", i,
+ (unsigned long long) pq16_get_src(descs, i),
+ pq->coef[i]);
+ }
+ dev_dbg(dev, "\tP: %#llx\n", pq->p_addr);
+ dev_dbg(dev, "\tQ: %#llx\n", pq->q_addr);
+}
+
+static struct dma_async_tx_descriptor *
+__ioat_prep_pq_lock(struct dma_chan *c, enum sum_check_flags *result,
+ const dma_addr_t *dst, const dma_addr_t *src,
+ unsigned int src_cnt, const unsigned char *scf,
+ size_t len, unsigned long flags)
+{
+ struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
+ struct ioatdma_device *ioat_dma = ioat_chan->ioat_dma;
+ struct ioat_ring_ent *compl_desc;
+ struct ioat_ring_ent *desc;
+ struct ioat_ring_ent *ext;
+ size_t total_len = len;
+ struct ioat_pq_descriptor *pq;
+ struct ioat_pq_ext_descriptor *pq_ex = NULL;
+ struct ioat_dma_descriptor *hw;
+ u32 offset = 0;
+ u8 op = result ? IOAT_OP_PQ_VAL : IOAT_OP_PQ;
+ int i, s, idx, with_ext, num_descs;
+ int cb32 = (ioat_dma->version < IOAT_VER_3_3) ? 1 : 0;
+
+ dev_dbg(to_dev(ioat_chan), "%s\n", __func__);
+ /* the engine requires at least two sources (we provide
+ * at least 1 implied source in the DMA_PREP_CONTINUE case)
+ */
+ BUG_ON(src_cnt + dmaf_continue(flags) < 2);
+
+ num_descs = ioat_xferlen_to_descs(ioat_chan, len);
+ /* we need 2x the number of descriptors to cover greater than 3
+ * sources (we need 1 extra source in the q-only continuation
+ * case and 3 extra sources in the p+q continuation case.
+ */
+ if (src_cnt + dmaf_p_disabled_continue(flags) > 3 ||
+ (dmaf_continue(flags) && !dmaf_p_disabled_continue(flags))) {
+ with_ext = 1;
+ num_descs *= 2;
+ } else
+ with_ext = 0;
+
+ /* completion writes from the raid engine may pass completion
+ * writes from the legacy engine, so we need one extra null
+ * (legacy) descriptor to ensure all completion writes arrive in
+ * order.
+ */
+ if (likely(num_descs) &&
+ ioat_check_space_lock(ioat_chan, num_descs + cb32) == 0)
+ idx = ioat_chan->head;
+ else
+ return NULL;
+ i = 0;
+ do {
+ struct ioat_raw_descriptor *descs[2];
+ size_t xfer_size = min_t(size_t, len,
+ 1 << ioat_chan->xfercap_log);
+
+ desc = ioat_get_ring_ent(ioat_chan, idx + i);
+ pq = desc->pq;
+
+ /* save a branch by unconditionally retrieving the
+ * extended descriptor pq_set_src() knows to not write
+ * to it in the single descriptor case
+ */
+ ext = ioat_get_ring_ent(ioat_chan, idx + i + with_ext);
+ pq_ex = ext->pq_ex;
+
+ descs[0] = (struct ioat_raw_descriptor *) pq;
+ descs[1] = (struct ioat_raw_descriptor *) pq_ex;
+
+ for (s = 0; s < src_cnt; s++)
+ pq_set_src(descs, src[s], offset, scf[s], s);
+
+ /* see the comment for dma_maxpq in include/linux/dmaengine.h */
+ if (dmaf_p_disabled_continue(flags))
+ pq_set_src(descs, dst[1], offset, 1, s++);
+ else if (dmaf_continue(flags)) {
+ pq_set_src(descs, dst[0], offset, 0, s++);
+ pq_set_src(descs, dst[1], offset, 1, s++);
+ pq_set_src(descs, dst[1], offset, 0, s++);
+ }
+ pq->size = xfer_size;
+ pq->p_addr = dst[0] + offset;
+ pq->q_addr = dst[1] + offset;
+ pq->ctl = 0;
+ pq->ctl_f.op = op;
+ /* we turn on descriptor write back error status */
+ if (ioat_dma->cap & IOAT_CAP_DWBES)
+ pq->ctl_f.wb_en = result ? 1 : 0;
+ pq->ctl_f.src_cnt = src_cnt_to_hw(s);
+ pq->ctl_f.p_disable = !!(flags & DMA_PREP_PQ_DISABLE_P);
+ pq->ctl_f.q_disable = !!(flags & DMA_PREP_PQ_DISABLE_Q);
+
+ len -= xfer_size;
+ offset += xfer_size;
+ } while ((i += 1 + with_ext) < num_descs);
+
+ /* last pq descriptor carries the unmap parameters and fence bit */
+ desc->txd.flags = flags;
+ desc->len = total_len;
+ if (result)
+ desc->result = result;
+ pq->ctl_f.fence = !!(flags & DMA_PREP_FENCE);
+ dump_pq_desc_dbg(ioat_chan, desc, ext);
+
+ if (!cb32) {
+ pq->ctl_f.int_en = !!(flags & DMA_PREP_INTERRUPT);
+ pq->ctl_f.compl_write = 1;
+ compl_desc = desc;
+ } else {
+ /* completion descriptor carries interrupt bit */
+ compl_desc = ioat_get_ring_ent(ioat_chan, idx + i);
+ compl_desc->txd.flags = flags & DMA_PREP_INTERRUPT;
+ hw = compl_desc->hw;
+ hw->ctl = 0;
+ hw->ctl_f.null = 1;
+ hw->ctl_f.int_en = !!(flags & DMA_PREP_INTERRUPT);
+ hw->ctl_f.compl_write = 1;
+ hw->size = NULL_DESC_BUFFER_SIZE;
+ dump_desc_dbg(ioat_chan, compl_desc);
+ }
+
+
+ /* we leave the channel locked to ensure in order submission */
+ return &compl_desc->txd;
+}
+
+static struct dma_async_tx_descriptor *
+__ioat_prep_pq16_lock(struct dma_chan *c, enum sum_check_flags *result,
+ const dma_addr_t *dst, const dma_addr_t *src,
+ unsigned int src_cnt, const unsigned char *scf,
+ size_t len, unsigned long flags)
+{
+ struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
+ struct ioatdma_device *ioat_dma = ioat_chan->ioat_dma;
+ struct ioat_ring_ent *desc;
+ size_t total_len = len;
+ struct ioat_pq_descriptor *pq;
+ u32 offset = 0;
+ u8 op;
+ int i, s, idx, num_descs;
+
+ /* this function is only called with 9-16 sources */
+ op = result ? IOAT_OP_PQ_VAL_16S : IOAT_OP_PQ_16S;
+
+ dev_dbg(to_dev(ioat_chan), "%s\n", __func__);
+
+ num_descs = ioat_xferlen_to_descs(ioat_chan, len);
+
+ /*
+ * 16 source pq is only available on cb3.3 and has no completion
+ * write hw bug.
+ */
+ if (num_descs && ioat_check_space_lock(ioat_chan, num_descs) == 0)
+ idx = ioat_chan->head;
+ else
+ return NULL;
+
+ i = 0;
+
+ do {
+ struct ioat_raw_descriptor *descs[4];
+ size_t xfer_size = min_t(size_t, len,
+ 1 << ioat_chan->xfercap_log);
+
+ desc = ioat_get_ring_ent(ioat_chan, idx + i);
+ pq = desc->pq;
+
+ descs[0] = (struct ioat_raw_descriptor *) pq;
+
+ desc->sed = ioat3_alloc_sed(ioat_dma, (src_cnt-2) >> 3);
+ if (!desc->sed) {
+ dev_err(to_dev(ioat_chan),
+ "%s: no free sed entries\n", __func__);
+ return NULL;
+ }
+
+ pq->sed_addr = desc->sed->dma;
+ desc->sed->parent = desc;
+
+ descs[1] = (struct ioat_raw_descriptor *)desc->sed->hw;
+ descs[2] = (void *)descs[1] + 64;
+
+ for (s = 0; s < src_cnt; s++)
+ pq16_set_src(descs, src[s], offset, scf[s], s);
+
+ /* see the comment for dma_maxpq in include/linux/dmaengine.h */
+ if (dmaf_p_disabled_continue(flags))
+ pq16_set_src(descs, dst[1], offset, 1, s++);
+ else if (dmaf_continue(flags)) {
+ pq16_set_src(descs, dst[0], offset, 0, s++);
+ pq16_set_src(descs, dst[1], offset, 1, s++);
+ pq16_set_src(descs, dst[1], offset, 0, s++);
+ }
+
+ pq->size = xfer_size;
+ pq->p_addr = dst[0] + offset;
+ pq->q_addr = dst[1] + offset;
+ pq->ctl = 0;
+ pq->ctl_f.op = op;
+ pq->ctl_f.src_cnt = src16_cnt_to_hw(s);
+ /* we turn on descriptor write back error status */
+ if (ioat_dma->cap & IOAT_CAP_DWBES)
+ pq->ctl_f.wb_en = result ? 1 : 0;
+ pq->ctl_f.p_disable = !!(flags & DMA_PREP_PQ_DISABLE_P);
+ pq->ctl_f.q_disable = !!(flags & DMA_PREP_PQ_DISABLE_Q);
+
+ len -= xfer_size;
+ offset += xfer_size;
+ } while (++i < num_descs);
+
+ /* last pq descriptor carries the unmap parameters and fence bit */
+ desc->txd.flags = flags;
+ desc->len = total_len;
+ if (result)
+ desc->result = result;
+ pq->ctl_f.fence = !!(flags & DMA_PREP_FENCE);
+
+ /* with cb3.3 we should be able to do completion w/o a null desc */
+ pq->ctl_f.int_en = !!(flags & DMA_PREP_INTERRUPT);
+ pq->ctl_f.compl_write = 1;
+
+ dump_pq16_desc_dbg(ioat_chan, desc);
+
+ /* we leave the channel locked to ensure in order submission */
+ return &desc->txd;
+}
+
+static int src_cnt_flags(unsigned int src_cnt, unsigned long flags)
+{
+ if (dmaf_p_disabled_continue(flags))
+ return src_cnt + 1;
+ else if (dmaf_continue(flags))
+ return src_cnt + 3;
+ else
+ return src_cnt;
+}
+
+struct dma_async_tx_descriptor *
+ioat_prep_pq(struct dma_chan *chan, dma_addr_t *dst, dma_addr_t *src,
+ unsigned int src_cnt, const unsigned char *scf, size_t len,
+ unsigned long flags)
+{
+ struct ioatdma_chan *ioat_chan = to_ioat_chan(chan);
+
+ if (test_bit(IOAT_CHAN_DOWN, &ioat_chan->state))
+ return NULL;
+
+ /* specify valid address for disabled result */
+ if (flags & DMA_PREP_PQ_DISABLE_P)
+ dst[0] = dst[1];
+ if (flags & DMA_PREP_PQ_DISABLE_Q)
+ dst[1] = dst[0];
+
+ /* handle the single source multiply case from the raid6
+ * recovery path
+ */
+ if ((flags & DMA_PREP_PQ_DISABLE_P) && src_cnt == 1) {
+ dma_addr_t single_source[2];
+ unsigned char single_source_coef[2];
+
+ BUG_ON(flags & DMA_PREP_PQ_DISABLE_Q);
+ single_source[0] = src[0];
+ single_source[1] = src[0];
+ single_source_coef[0] = scf[0];
+ single_source_coef[1] = 0;
+
+ return src_cnt_flags(src_cnt, flags) > 8 ?
+ __ioat_prep_pq16_lock(chan, NULL, dst, single_source,
+ 2, single_source_coef, len,
+ flags) :
+ __ioat_prep_pq_lock(chan, NULL, dst, single_source, 2,
+ single_source_coef, len, flags);
+
+ } else {
+ return src_cnt_flags(src_cnt, flags) > 8 ?
+ __ioat_prep_pq16_lock(chan, NULL, dst, src, src_cnt,
+ scf, len, flags) :
+ __ioat_prep_pq_lock(chan, NULL, dst, src, src_cnt,
+ scf, len, flags);
+ }
+}
+
+struct dma_async_tx_descriptor *
+ioat_prep_pq_val(struct dma_chan *chan, dma_addr_t *pq, dma_addr_t *src,
+ unsigned int src_cnt, const unsigned char *scf, size_t len,
+ enum sum_check_flags *pqres, unsigned long flags)
+{
+ struct ioatdma_chan *ioat_chan = to_ioat_chan(chan);
+
+ if (test_bit(IOAT_CHAN_DOWN, &ioat_chan->state))
+ return NULL;
+
+ /* specify valid address for disabled result */
+ if (flags & DMA_PREP_PQ_DISABLE_P)
+ pq[0] = pq[1];
+ if (flags & DMA_PREP_PQ_DISABLE_Q)
+ pq[1] = pq[0];
+
+ /* the cleanup routine only sets bits on validate failure, it
+ * does not clear bits on validate success... so clear it here
+ */
+ *pqres = 0;
+
+ return src_cnt_flags(src_cnt, flags) > 8 ?
+ __ioat_prep_pq16_lock(chan, pqres, pq, src, src_cnt, scf, len,
+ flags) :
+ __ioat_prep_pq_lock(chan, pqres, pq, src, src_cnt, scf, len,
+ flags);
+}
+
+struct dma_async_tx_descriptor *
+ioat_prep_pqxor(struct dma_chan *chan, dma_addr_t dst, dma_addr_t *src,
+ unsigned int src_cnt, size_t len, unsigned long flags)
+{
+ unsigned char scf[MAX_SCF];
+ dma_addr_t pq[2];
+ struct ioatdma_chan *ioat_chan = to_ioat_chan(chan);
+
+ if (test_bit(IOAT_CHAN_DOWN, &ioat_chan->state))
+ return NULL;
+
+ if (src_cnt > MAX_SCF)
+ return NULL;
+
+ memset(scf, 0, src_cnt);
+ pq[0] = dst;
+ flags |= DMA_PREP_PQ_DISABLE_Q;
+ pq[1] = dst; /* specify valid address for disabled result */
+
+ return src_cnt_flags(src_cnt, flags) > 8 ?
+ __ioat_prep_pq16_lock(chan, NULL, pq, src, src_cnt, scf, len,
+ flags) :
+ __ioat_prep_pq_lock(chan, NULL, pq, src, src_cnt, scf, len,
+ flags);
+}
+
+struct dma_async_tx_descriptor *
+ioat_prep_pqxor_val(struct dma_chan *chan, dma_addr_t *src,
+ unsigned int src_cnt, size_t len,
+ enum sum_check_flags *result, unsigned long flags)
+{
+ unsigned char scf[MAX_SCF];
+ dma_addr_t pq[2];
+ struct ioatdma_chan *ioat_chan = to_ioat_chan(chan);
+
+ if (test_bit(IOAT_CHAN_DOWN, &ioat_chan->state))
+ return NULL;
+
+ if (src_cnt > MAX_SCF)
+ return NULL;
+
+ /* the cleanup routine only sets bits on validate failure, it
+ * does not clear bits on validate success... so clear it here
+ */
+ *result = 0;
+
+ memset(scf, 0, src_cnt);
+ pq[0] = src[0];
+ flags |= DMA_PREP_PQ_DISABLE_Q;
+ pq[1] = pq[0]; /* specify valid address for disabled result */
+
+ return src_cnt_flags(src_cnt, flags) > 8 ?
+ __ioat_prep_pq16_lock(chan, result, pq, &src[1], src_cnt - 1,
+ scf, len, flags) :
+ __ioat_prep_pq_lock(chan, result, pq, &src[1], src_cnt - 1,
+ scf, len, flags);
+}
+
+struct dma_async_tx_descriptor *
+ioat_prep_interrupt_lock(struct dma_chan *c, unsigned long flags)
+{
+ struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
+ struct ioat_ring_ent *desc;
+ struct ioat_dma_descriptor *hw;
+
+ if (test_bit(IOAT_CHAN_DOWN, &ioat_chan->state))
+ return NULL;
+
+ if (ioat_check_space_lock(ioat_chan, 1) == 0)
+ desc = ioat_get_ring_ent(ioat_chan, ioat_chan->head);
+ else
+ return NULL;
+
+ hw = desc->hw;
+ hw->ctl = 0;
+ hw->ctl_f.null = 1;
+ hw->ctl_f.int_en = 1;
+ hw->ctl_f.fence = !!(flags & DMA_PREP_FENCE);
+ hw->ctl_f.compl_write = 1;
+ hw->size = NULL_DESC_BUFFER_SIZE;
+ hw->src_addr = 0;
+ hw->dst_addr = 0;
+
+ desc->txd.flags = flags;
+ desc->len = 1;
+
+ dump_desc_dbg(ioat_chan, desc);
+
+ /* we leave the channel locked to ensure in order submission */
+ return &desc->txd;
+}
+
diff --git a/drivers/dma/ioat/registers.h b/drivers/dma/ioat/registers.h
new file mode 100644
index 000000000..f55a5f92f
--- /dev/null
+++ b/drivers/dma/ioat/registers.h
@@ -0,0 +1,258 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright(c) 2004 - 2009 Intel Corporation. All rights reserved.
+ */
+#ifndef _IOAT_REGISTERS_H_
+#define _IOAT_REGISTERS_H_
+
+#define IOAT_PCI_DMACTRL_OFFSET 0x48
+#define IOAT_PCI_DMACTRL_DMA_EN 0x00000001
+#define IOAT_PCI_DMACTRL_MSI_EN 0x00000002
+
+#define IOAT_PCI_DEVICE_ID_OFFSET 0x02
+#define IOAT_PCI_DMAUNCERRSTS_OFFSET 0x148
+#define IOAT_PCI_CHANERR_INT_OFFSET 0x180
+#define IOAT_PCI_CHANERRMASK_INT_OFFSET 0x184
+
+/* PCIe config registers */
+
+/* EXPCAPID + N */
+#define IOAT_DEVCTRL_OFFSET 0x8
+/* relaxed ordering enable */
+#define IOAT_DEVCTRL_ROE 0x10
+
+/* MMIO Device Registers */
+#define IOAT_CHANCNT_OFFSET 0x00 /* 8-bit */
+
+#define IOAT_XFERCAP_OFFSET 0x01 /* 8-bit */
+#define IOAT_XFERCAP_4KB 12
+#define IOAT_XFERCAP_8KB 13
+#define IOAT_XFERCAP_16KB 14
+#define IOAT_XFERCAP_32KB 15
+#define IOAT_XFERCAP_32GB 0
+
+#define IOAT_GENCTRL_OFFSET 0x02 /* 8-bit */
+#define IOAT_GENCTRL_DEBUG_EN 0x01
+
+#define IOAT_INTRCTRL_OFFSET 0x03 /* 8-bit */
+#define IOAT_INTRCTRL_MASTER_INT_EN 0x01 /* Master Interrupt Enable */
+#define IOAT_INTRCTRL_INT_STATUS 0x02 /* ATTNSTATUS -or- Channel Int */
+#define IOAT_INTRCTRL_INT 0x04 /* INT_STATUS -and- MASTER_INT_EN */
+#define IOAT_INTRCTRL_MSIX_VECTOR_CONTROL 0x08 /* Enable all MSI-X vectors */
+
+#define IOAT_ATTNSTATUS_OFFSET 0x04 /* Each bit is a channel */
+
+#define IOAT_VER_OFFSET 0x08 /* 8-bit */
+#define IOAT_VER_MAJOR_MASK 0xF0
+#define IOAT_VER_MINOR_MASK 0x0F
+#define GET_IOAT_VER_MAJOR(x) (((x) & IOAT_VER_MAJOR_MASK) >> 4)
+#define GET_IOAT_VER_MINOR(x) ((x) & IOAT_VER_MINOR_MASK)
+
+#define IOAT_PERPORTOFFSET_OFFSET 0x0A /* 16-bit */
+
+#define IOAT_INTRDELAY_OFFSET 0x0C /* 16-bit */
+#define IOAT_INTRDELAY_MASK 0x3FFF /* Interrupt Delay Time */
+#define IOAT_INTRDELAY_COALESE_SUPPORT 0x8000 /* Interrupt Coalescing Supported */
+
+#define IOAT_DEVICE_STATUS_OFFSET 0x0E /* 16-bit */
+#define IOAT_DEVICE_STATUS_DEGRADED_MODE 0x0001
+#define IOAT_DEVICE_MMIO_RESTRICTED 0x0002
+#define IOAT_DEVICE_MEMORY_BYPASS 0x0004
+#define IOAT_DEVICE_ADDRESS_REMAPPING 0x0008
+
+#define IOAT_DMA_CAP_OFFSET 0x10 /* 32-bit */
+#define IOAT_CAP_PAGE_BREAK 0x00000001
+#define IOAT_CAP_CRC 0x00000002
+#define IOAT_CAP_SKIP_MARKER 0x00000004
+#define IOAT_CAP_DCA 0x00000010
+#define IOAT_CAP_CRC_MOVE 0x00000020
+#define IOAT_CAP_FILL_BLOCK 0x00000040
+#define IOAT_CAP_APIC 0x00000080
+#define IOAT_CAP_XOR 0x00000100
+#define IOAT_CAP_PQ 0x00000200
+#define IOAT_CAP_DWBES 0x00002000
+#define IOAT_CAP_RAID16SS 0x00020000
+#define IOAT_CAP_DPS 0x00800000
+
+#define IOAT_PREFETCH_LIMIT_OFFSET 0x4C /* CHWPREFLMT */
+
+#define IOAT_CHANNEL_MMIO_SIZE 0x80 /* Each Channel MMIO space is this size */
+
+/* DMA Channel Registers */
+#define IOAT_CHANCTRL_OFFSET 0x00 /* 16-bit Channel Control Register */
+#define IOAT_CHANCTRL_CHANNEL_PRIORITY_MASK 0xF000
+#define IOAT3_CHANCTRL_COMPL_DCA_EN 0x0200
+#define IOAT_CHANCTRL_CHANNEL_IN_USE 0x0100
+#define IOAT_CHANCTRL_DESCRIPTOR_ADDR_SNOOP_CONTROL 0x0020
+#define IOAT_CHANCTRL_ERR_INT_EN 0x0010
+#define IOAT_CHANCTRL_ANY_ERR_ABORT_EN 0x0008
+#define IOAT_CHANCTRL_ERR_COMPLETION_EN 0x0004
+#define IOAT_CHANCTRL_INT_REARM 0x0001
+#define IOAT_CHANCTRL_RUN (IOAT_CHANCTRL_INT_REARM |\
+ IOAT_CHANCTRL_ERR_INT_EN |\
+ IOAT_CHANCTRL_ERR_COMPLETION_EN |\
+ IOAT_CHANCTRL_ANY_ERR_ABORT_EN)
+
+#define IOAT_DMA_COMP_OFFSET 0x02 /* 16-bit DMA channel compatibility */
+#define IOAT_DMA_COMP_V1 0x0001 /* Compatibility with DMA version 1 */
+#define IOAT_DMA_COMP_V2 0x0002 /* Compatibility with DMA version 2 */
+
+#define IOAT_CHANSTS_OFFSET 0x08 /* 64-bit Channel Status Register */
+#define IOAT_CHANSTS_COMPLETED_DESCRIPTOR_ADDR (~0x3fULL)
+#define IOAT_CHANSTS_SOFT_ERR 0x10ULL
+#define IOAT_CHANSTS_UNAFFILIATED_ERR 0x8ULL
+#define IOAT_CHANSTS_STATUS 0x7ULL
+#define IOAT_CHANSTS_ACTIVE 0x0
+#define IOAT_CHANSTS_DONE 0x1
+#define IOAT_CHANSTS_SUSPENDED 0x2
+#define IOAT_CHANSTS_HALTED 0x3
+
+
+
+#define IOAT_CHAN_DMACOUNT_OFFSET 0x06 /* 16-bit DMA Count register */
+
+#define IOAT_DCACTRL_OFFSET 0x30 /* 32 bit Direct Cache Access Control Register */
+#define IOAT_DCACTRL_CMPL_WRITE_ENABLE 0x10000
+#define IOAT_DCACTRL_TARGET_CPU_MASK 0xFFFF /* APIC ID */
+
+/* CB DCA Memory Space Registers */
+#define IOAT_DCAOFFSET_OFFSET 0x14
+/* CB_BAR + IOAT_DCAOFFSET value */
+#define IOAT_DCA_VER_OFFSET 0x00
+#define IOAT_DCA_VER_MAJOR_MASK 0xF0
+#define IOAT_DCA_VER_MINOR_MASK 0x0F
+
+#define IOAT_DCA_COMP_OFFSET 0x02
+#define IOAT_DCA_COMP_V1 0x1
+
+#define IOAT_FSB_CAPABILITY_OFFSET 0x04
+#define IOAT_FSB_CAPABILITY_PREFETCH 0x1
+
+#define IOAT_PCI_CAPABILITY_OFFSET 0x06
+#define IOAT_PCI_CAPABILITY_MEMWR 0x1
+
+#define IOAT_FSB_CAP_ENABLE_OFFSET 0x08
+#define IOAT_FSB_CAP_ENABLE_PREFETCH 0x1
+
+#define IOAT_PCI_CAP_ENABLE_OFFSET 0x0A
+#define IOAT_PCI_CAP_ENABLE_MEMWR 0x1
+
+#define IOAT_APICID_TAG_MAP_OFFSET 0x0C
+#define IOAT_APICID_TAG_MAP_TAG0 0x0000000F
+#define IOAT_APICID_TAG_MAP_TAG0_SHIFT 0
+#define IOAT_APICID_TAG_MAP_TAG1 0x000000F0
+#define IOAT_APICID_TAG_MAP_TAG1_SHIFT 4
+#define IOAT_APICID_TAG_MAP_TAG2 0x00000F00
+#define IOAT_APICID_TAG_MAP_TAG2_SHIFT 8
+#define IOAT_APICID_TAG_MAP_TAG3 0x0000F000
+#define IOAT_APICID_TAG_MAP_TAG3_SHIFT 12
+#define IOAT_APICID_TAG_MAP_TAG4 0x000F0000
+#define IOAT_APICID_TAG_MAP_TAG4_SHIFT 16
+#define IOAT_APICID_TAG_CB2_VALID 0x8080808080
+
+#define IOAT_DCA_GREQID_OFFSET 0x10
+#define IOAT_DCA_GREQID_SIZE 0x04
+#define IOAT_DCA_GREQID_MASK 0xFFFF
+#define IOAT_DCA_GREQID_IGNOREFUN 0x10000000
+#define IOAT_DCA_GREQID_VALID 0x20000000
+#define IOAT_DCA_GREQID_LASTID 0x80000000
+
+#define IOAT3_CSI_CAPABILITY_OFFSET 0x08
+#define IOAT3_CSI_CAPABILITY_PREFETCH 0x1
+
+#define IOAT3_PCI_CAPABILITY_OFFSET 0x0A
+#define IOAT3_PCI_CAPABILITY_MEMWR 0x1
+
+#define IOAT3_CSI_CONTROL_OFFSET 0x0C
+#define IOAT3_CSI_CONTROL_PREFETCH 0x1
+
+#define IOAT3_PCI_CONTROL_OFFSET 0x0E
+#define IOAT3_PCI_CONTROL_MEMWR 0x1
+
+#define IOAT3_APICID_TAG_MAP_OFFSET 0x10
+#define IOAT3_APICID_TAG_MAP_OFFSET_LOW 0x10
+#define IOAT3_APICID_TAG_MAP_OFFSET_HIGH 0x14
+
+#define IOAT3_DCA_GREQID_OFFSET 0x02
+
+#define IOAT1_CHAINADDR_OFFSET 0x0C /* 64-bit Descriptor Chain Address Register */
+#define IOAT2_CHAINADDR_OFFSET 0x10 /* 64-bit Descriptor Chain Address Register */
+#define IOAT_CHAINADDR_OFFSET(ver) ((ver) < IOAT_VER_2_0 \
+ ? IOAT1_CHAINADDR_OFFSET : IOAT2_CHAINADDR_OFFSET)
+#define IOAT1_CHAINADDR_OFFSET_LOW 0x0C
+#define IOAT2_CHAINADDR_OFFSET_LOW 0x10
+#define IOAT_CHAINADDR_OFFSET_LOW(ver) ((ver) < IOAT_VER_2_0 \
+ ? IOAT1_CHAINADDR_OFFSET_LOW : IOAT2_CHAINADDR_OFFSET_LOW)
+#define IOAT1_CHAINADDR_OFFSET_HIGH 0x10
+#define IOAT2_CHAINADDR_OFFSET_HIGH 0x14
+#define IOAT_CHAINADDR_OFFSET_HIGH(ver) ((ver) < IOAT_VER_2_0 \
+ ? IOAT1_CHAINADDR_OFFSET_HIGH : IOAT2_CHAINADDR_OFFSET_HIGH)
+
+#define IOAT1_CHANCMD_OFFSET 0x14 /* 8-bit DMA Channel Command Register */
+#define IOAT2_CHANCMD_OFFSET 0x04 /* 8-bit DMA Channel Command Register */
+#define IOAT_CHANCMD_OFFSET(ver) ((ver) < IOAT_VER_2_0 \
+ ? IOAT1_CHANCMD_OFFSET : IOAT2_CHANCMD_OFFSET)
+#define IOAT_CHANCMD_RESET 0x20
+#define IOAT_CHANCMD_RESUME 0x10
+#define IOAT_CHANCMD_ABORT 0x08
+#define IOAT_CHANCMD_SUSPEND 0x04
+#define IOAT_CHANCMD_APPEND 0x02
+#define IOAT_CHANCMD_START 0x01
+
+#define IOAT_CHANCMP_OFFSET 0x18 /* 64-bit Channel Completion Address Register */
+#define IOAT_CHANCMP_OFFSET_LOW 0x18
+#define IOAT_CHANCMP_OFFSET_HIGH 0x1C
+
+#define IOAT_CDAR_OFFSET 0x20 /* 64-bit Current Descriptor Address Register */
+#define IOAT_CDAR_OFFSET_LOW 0x20
+#define IOAT_CDAR_OFFSET_HIGH 0x24
+
+#define IOAT_CHANERR_OFFSET 0x28 /* 32-bit Channel Error Register */
+#define IOAT_CHANERR_SRC_ADDR_ERR 0x0001
+#define IOAT_CHANERR_DEST_ADDR_ERR 0x0002
+#define IOAT_CHANERR_NEXT_ADDR_ERR 0x0004
+#define IOAT_CHANERR_NEXT_DESC_ALIGN_ERR 0x0008
+#define IOAT_CHANERR_CHAIN_ADDR_VALUE_ERR 0x0010
+#define IOAT_CHANERR_CHANCMD_ERR 0x0020
+#define IOAT_CHANERR_CHIPSET_UNCORRECTABLE_DATA_INTEGRITY_ERR 0x0040
+#define IOAT_CHANERR_DMA_UNCORRECTABLE_DATA_INTEGRITY_ERR 0x0080
+#define IOAT_CHANERR_READ_DATA_ERR 0x0100
+#define IOAT_CHANERR_WRITE_DATA_ERR 0x0200
+#define IOAT_CHANERR_CONTROL_ERR 0x0400
+#define IOAT_CHANERR_LENGTH_ERR 0x0800
+#define IOAT_CHANERR_COMPLETION_ADDR_ERR 0x1000
+#define IOAT_CHANERR_INT_CONFIGURATION_ERR 0x2000
+#define IOAT_CHANERR_SOFT_ERR 0x4000
+#define IOAT_CHANERR_UNAFFILIATED_ERR 0x8000
+#define IOAT_CHANERR_XOR_P_OR_CRC_ERR 0x10000
+#define IOAT_CHANERR_XOR_Q_ERR 0x20000
+#define IOAT_CHANERR_DESCRIPTOR_COUNT_ERR 0x40000
+
+#define IOAT_CHANERR_HANDLE_MASK (IOAT_CHANERR_XOR_P_OR_CRC_ERR | IOAT_CHANERR_XOR_Q_ERR)
+#define IOAT_CHANERR_RECOVER_MASK (IOAT_CHANERR_READ_DATA_ERR | \
+ IOAT_CHANERR_WRITE_DATA_ERR)
+
+#define IOAT_CHANERR_MASK_OFFSET 0x2C /* 32-bit Channel Error Register */
+
+#define IOAT_CHAN_DRSCTL_OFFSET 0xB6
+#define IOAT_CHAN_DRSZ_4KB 0x0000
+#define IOAT_CHAN_DRSZ_8KB 0x0001
+#define IOAT_CHAN_DRSZ_2MB 0x0009
+#define IOAT_CHAN_DRS_EN 0x0100
+#define IOAT_CHAN_DRS_AUTOWRAP 0x0200
+
+#define IOAT_CHAN_LTR_SWSEL_OFFSET 0xBC
+#define IOAT_CHAN_LTR_SWSEL_ACTIVE 0x0
+#define IOAT_CHAN_LTR_SWSEL_IDLE 0x1
+
+#define IOAT_CHAN_LTR_ACTIVE_OFFSET 0xC0
+#define IOAT_CHAN_LTR_ACTIVE_SNVAL 0x0000 /* 0 us */
+#define IOAT_CHAN_LTR_ACTIVE_SNLATSCALE 0x0800 /* 1us scale */
+#define IOAT_CHAN_LTR_ACTIVE_SNREQMNT 0x8000 /* snoop req enable */
+
+#define IOAT_CHAN_LTR_IDLE_OFFSET 0xC4
+#define IOAT_CHAN_LTR_IDLE_SNVAL 0x0258 /* 600 us */
+#define IOAT_CHAN_LTR_IDLE_SNLATSCALE 0x0800 /* 1us scale */
+#define IOAT_CHAN_LTR_IDLE_SNREQMNT 0x8000 /* snoop req enable */
+
+#endif /* _IOAT_REGISTERS_H_ */
diff --git a/drivers/dma/ioat/sysfs.c b/drivers/dma/ioat/sysfs.c
new file mode 100644
index 000000000..168adf28c
--- /dev/null
+++ b/drivers/dma/ioat/sysfs.c
@@ -0,0 +1,166 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Intel I/OAT DMA Linux driver
+ * Copyright(c) 2004 - 2015 Intel Corporation.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/dmaengine.h>
+#include <linux/pci.h>
+#include "dma.h"
+#include "registers.h"
+#include "hw.h"
+
+#include "../dmaengine.h"
+
+static ssize_t cap_show(struct dma_chan *c, char *page)
+{
+ struct dma_device *dma = c->device;
+
+ return sprintf(page, "copy%s%s%s%s%s\n",
+ dma_has_cap(DMA_PQ, dma->cap_mask) ? " pq" : "",
+ dma_has_cap(DMA_PQ_VAL, dma->cap_mask) ? " pq_val" : "",
+ dma_has_cap(DMA_XOR, dma->cap_mask) ? " xor" : "",
+ dma_has_cap(DMA_XOR_VAL, dma->cap_mask) ? " xor_val" : "",
+ dma_has_cap(DMA_INTERRUPT, dma->cap_mask) ? " intr" : "");
+
+}
+struct ioat_sysfs_entry ioat_cap_attr = __ATTR_RO(cap);
+
+static ssize_t version_show(struct dma_chan *c, char *page)
+{
+ struct dma_device *dma = c->device;
+ struct ioatdma_device *ioat_dma = to_ioatdma_device(dma);
+
+ return sprintf(page, "%d.%d\n",
+ ioat_dma->version >> 4, ioat_dma->version & 0xf);
+}
+struct ioat_sysfs_entry ioat_version_attr = __ATTR_RO(version);
+
+static ssize_t
+ioat_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
+{
+ struct ioat_sysfs_entry *entry;
+ struct ioatdma_chan *ioat_chan;
+
+ entry = container_of(attr, struct ioat_sysfs_entry, attr);
+ ioat_chan = container_of(kobj, struct ioatdma_chan, kobj);
+
+ if (!entry->show)
+ return -EIO;
+ return entry->show(&ioat_chan->dma_chan, page);
+}
+
+static ssize_t
+ioat_attr_store(struct kobject *kobj, struct attribute *attr,
+const char *page, size_t count)
+{
+ struct ioat_sysfs_entry *entry;
+ struct ioatdma_chan *ioat_chan;
+
+ entry = container_of(attr, struct ioat_sysfs_entry, attr);
+ ioat_chan = container_of(kobj, struct ioatdma_chan, kobj);
+
+ if (!entry->store)
+ return -EIO;
+ return entry->store(&ioat_chan->dma_chan, page, count);
+}
+
+const struct sysfs_ops ioat_sysfs_ops = {
+ .show = ioat_attr_show,
+ .store = ioat_attr_store,
+};
+
+void ioat_kobject_add(struct ioatdma_device *ioat_dma, struct kobj_type *type)
+{
+ struct dma_device *dma = &ioat_dma->dma_dev;
+ struct dma_chan *c;
+
+ list_for_each_entry(c, &dma->channels, device_node) {
+ struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
+ struct kobject *parent = &c->dev->device.kobj;
+ int err;
+
+ err = kobject_init_and_add(&ioat_chan->kobj, type,
+ parent, "quickdata");
+ if (err) {
+ dev_warn(to_dev(ioat_chan),
+ "sysfs init error (%d), continuing...\n", err);
+ kobject_put(&ioat_chan->kobj);
+ set_bit(IOAT_KOBJ_INIT_FAIL, &ioat_chan->state);
+ }
+ }
+}
+
+void ioat_kobject_del(struct ioatdma_device *ioat_dma)
+{
+ struct dma_device *dma = &ioat_dma->dma_dev;
+ struct dma_chan *c;
+
+ list_for_each_entry(c, &dma->channels, device_node) {
+ struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
+
+ if (!test_bit(IOAT_KOBJ_INIT_FAIL, &ioat_chan->state)) {
+ kobject_del(&ioat_chan->kobj);
+ kobject_put(&ioat_chan->kobj);
+ }
+ }
+}
+
+static ssize_t ring_size_show(struct dma_chan *c, char *page)
+{
+ struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
+
+ return sprintf(page, "%d\n", (1 << ioat_chan->alloc_order) & ~1);
+}
+static struct ioat_sysfs_entry ring_size_attr = __ATTR_RO(ring_size);
+
+static ssize_t ring_active_show(struct dma_chan *c, char *page)
+{
+ struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
+
+ /* ...taken outside the lock, no need to be precise */
+ return sprintf(page, "%d\n", ioat_ring_active(ioat_chan));
+}
+static struct ioat_sysfs_entry ring_active_attr = __ATTR_RO(ring_active);
+
+static ssize_t intr_coalesce_show(struct dma_chan *c, char *page)
+{
+ struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
+
+ return sprintf(page, "%d\n", ioat_chan->intr_coalesce);
+}
+
+static ssize_t intr_coalesce_store(struct dma_chan *c, const char *page,
+size_t count)
+{
+ int intr_coalesce = 0;
+ struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
+
+ if (sscanf(page, "%du", &intr_coalesce) != -1) {
+ if ((intr_coalesce < 0) ||
+ (intr_coalesce > IOAT_INTRDELAY_MASK))
+ return -EINVAL;
+ ioat_chan->intr_coalesce = intr_coalesce;
+ }
+
+ return count;
+}
+
+static struct ioat_sysfs_entry intr_coalesce_attr = __ATTR_RW(intr_coalesce);
+
+static struct attribute *ioat_attrs[] = {
+ &ring_size_attr.attr,
+ &ring_active_attr.attr,
+ &ioat_cap_attr.attr,
+ &ioat_version_attr.attr,
+ &intr_coalesce_attr.attr,
+ NULL,
+};
+ATTRIBUTE_GROUPS(ioat);
+
+struct kobj_type ioat_ktype = {
+ .sysfs_ops = &ioat_sysfs_ops,
+ .default_groups = ioat_groups,
+};