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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/thunderbolt/nhi.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/thunderbolt/nhi.c')
-rw-r--r--drivers/thunderbolt/nhi.c1562
1 files changed, 1562 insertions, 0 deletions
diff --git a/drivers/thunderbolt/nhi.c b/drivers/thunderbolt/nhi.c
new file mode 100644
index 0000000000..4b7bec74e8
--- /dev/null
+++ b/drivers/thunderbolt/nhi.c
@@ -0,0 +1,1562 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Thunderbolt driver - NHI driver
+ *
+ * The NHI (native host interface) is the pci device that allows us to send and
+ * receive frames from the thunderbolt bus.
+ *
+ * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
+ * Copyright (C) 2018, Intel Corporation
+ */
+
+#include <linux/pm_runtime.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/pci.h>
+#include <linux/dma-mapping.h>
+#include <linux/interrupt.h>
+#include <linux/iommu.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/property.h>
+#include <linux/string_helpers.h>
+
+#include "nhi.h"
+#include "nhi_regs.h"
+#include "tb.h"
+
+#define RING_TYPE(ring) ((ring)->is_tx ? "TX ring" : "RX ring")
+
+#define RING_FIRST_USABLE_HOPID 1
+/*
+ * Used with QUIRK_E2E to specify an unused HopID the Rx credits are
+ * transferred.
+ */
+#define RING_E2E_RESERVED_HOPID RING_FIRST_USABLE_HOPID
+/*
+ * Minimal number of vectors when we use MSI-X. Two for control channel
+ * Rx/Tx and the rest four are for cross domain DMA paths.
+ */
+#define MSIX_MIN_VECS 6
+#define MSIX_MAX_VECS 16
+
+#define NHI_MAILBOX_TIMEOUT 500 /* ms */
+
+/* Host interface quirks */
+#define QUIRK_AUTO_CLEAR_INT BIT(0)
+#define QUIRK_E2E BIT(1)
+
+static bool host_reset = true;
+module_param(host_reset, bool, 0444);
+MODULE_PARM_DESC(host_reset, "reset USBv2 host router (default: true)");
+
+static int ring_interrupt_index(const struct tb_ring *ring)
+{
+ int bit = ring->hop;
+ if (!ring->is_tx)
+ bit += ring->nhi->hop_count;
+ return bit;
+}
+
+static void nhi_mask_interrupt(struct tb_nhi *nhi, int mask, int ring)
+{
+ if (nhi->quirks & QUIRK_AUTO_CLEAR_INT) {
+ u32 val;
+
+ val = ioread32(nhi->iobase + REG_RING_INTERRUPT_BASE + ring);
+ iowrite32(val & ~mask, nhi->iobase + REG_RING_INTERRUPT_BASE + ring);
+ } else {
+ iowrite32(mask, nhi->iobase + REG_RING_INTERRUPT_MASK_CLEAR_BASE + ring);
+ }
+}
+
+static void nhi_clear_interrupt(struct tb_nhi *nhi, int ring)
+{
+ if (nhi->quirks & QUIRK_AUTO_CLEAR_INT)
+ ioread32(nhi->iobase + REG_RING_NOTIFY_BASE + ring);
+ else
+ iowrite32(~0, nhi->iobase + REG_RING_INT_CLEAR + ring);
+}
+
+/*
+ * ring_interrupt_active() - activate/deactivate interrupts for a single ring
+ *
+ * ring->nhi->lock must be held.
+ */
+static void ring_interrupt_active(struct tb_ring *ring, bool active)
+{
+ int index = ring_interrupt_index(ring) / 32 * 4;
+ int reg = REG_RING_INTERRUPT_BASE + index;
+ int interrupt_bit = ring_interrupt_index(ring) & 31;
+ int mask = 1 << interrupt_bit;
+ u32 old, new;
+
+ if (ring->irq > 0) {
+ u32 step, shift, ivr, misc;
+ void __iomem *ivr_base;
+ int auto_clear_bit;
+ int index;
+
+ if (ring->is_tx)
+ index = ring->hop;
+ else
+ index = ring->hop + ring->nhi->hop_count;
+
+ /*
+ * Intel routers support a bit that isn't part of
+ * the USB4 spec to ask the hardware to clear
+ * interrupt status bits automatically since
+ * we already know which interrupt was triggered.
+ *
+ * Other routers explicitly disable auto-clear
+ * to prevent conditions that may occur where two
+ * MSIX interrupts are simultaneously active and
+ * reading the register clears both of them.
+ */
+ misc = ioread32(ring->nhi->iobase + REG_DMA_MISC);
+ if (ring->nhi->quirks & QUIRK_AUTO_CLEAR_INT)
+ auto_clear_bit = REG_DMA_MISC_INT_AUTO_CLEAR;
+ else
+ auto_clear_bit = REG_DMA_MISC_DISABLE_AUTO_CLEAR;
+ if (!(misc & auto_clear_bit))
+ iowrite32(misc | auto_clear_bit,
+ ring->nhi->iobase + REG_DMA_MISC);
+
+ ivr_base = ring->nhi->iobase + REG_INT_VEC_ALLOC_BASE;
+ step = index / REG_INT_VEC_ALLOC_REGS * REG_INT_VEC_ALLOC_BITS;
+ shift = index % REG_INT_VEC_ALLOC_REGS * REG_INT_VEC_ALLOC_BITS;
+ ivr = ioread32(ivr_base + step);
+ ivr &= ~(REG_INT_VEC_ALLOC_MASK << shift);
+ if (active)
+ ivr |= ring->vector << shift;
+ iowrite32(ivr, ivr_base + step);
+ }
+
+ old = ioread32(ring->nhi->iobase + reg);
+ if (active)
+ new = old | mask;
+ else
+ new = old & ~mask;
+
+ dev_dbg(&ring->nhi->pdev->dev,
+ "%s interrupt at register %#x bit %d (%#x -> %#x)\n",
+ active ? "enabling" : "disabling", reg, interrupt_bit, old, new);
+
+ if (new == old)
+ dev_WARN(&ring->nhi->pdev->dev,
+ "interrupt for %s %d is already %s\n",
+ RING_TYPE(ring), ring->hop,
+ active ? "enabled" : "disabled");
+
+ if (active)
+ iowrite32(new, ring->nhi->iobase + reg);
+ else
+ nhi_mask_interrupt(ring->nhi, mask, index);
+}
+
+/*
+ * nhi_disable_interrupts() - disable interrupts for all rings
+ *
+ * Use only during init and shutdown.
+ */
+static void nhi_disable_interrupts(struct tb_nhi *nhi)
+{
+ int i = 0;
+ /* disable interrupts */
+ for (i = 0; i < RING_INTERRUPT_REG_COUNT(nhi); i++)
+ nhi_mask_interrupt(nhi, ~0, 4 * i);
+
+ /* clear interrupt status bits */
+ for (i = 0; i < RING_NOTIFY_REG_COUNT(nhi); i++)
+ nhi_clear_interrupt(nhi, 4 * i);
+}
+
+/* ring helper methods */
+
+static void __iomem *ring_desc_base(struct tb_ring *ring)
+{
+ void __iomem *io = ring->nhi->iobase;
+ io += ring->is_tx ? REG_TX_RING_BASE : REG_RX_RING_BASE;
+ io += ring->hop * 16;
+ return io;
+}
+
+static void __iomem *ring_options_base(struct tb_ring *ring)
+{
+ void __iomem *io = ring->nhi->iobase;
+ io += ring->is_tx ? REG_TX_OPTIONS_BASE : REG_RX_OPTIONS_BASE;
+ io += ring->hop * 32;
+ return io;
+}
+
+static void ring_iowrite_cons(struct tb_ring *ring, u16 cons)
+{
+ /*
+ * The other 16-bits in the register is read-only and writes to it
+ * are ignored by the hardware so we can save one ioread32() by
+ * filling the read-only bits with zeroes.
+ */
+ iowrite32(cons, ring_desc_base(ring) + 8);
+}
+
+static void ring_iowrite_prod(struct tb_ring *ring, u16 prod)
+{
+ /* See ring_iowrite_cons() above for explanation */
+ iowrite32(prod << 16, ring_desc_base(ring) + 8);
+}
+
+static void ring_iowrite32desc(struct tb_ring *ring, u32 value, u32 offset)
+{
+ iowrite32(value, ring_desc_base(ring) + offset);
+}
+
+static void ring_iowrite64desc(struct tb_ring *ring, u64 value, u32 offset)
+{
+ iowrite32(value, ring_desc_base(ring) + offset);
+ iowrite32(value >> 32, ring_desc_base(ring) + offset + 4);
+}
+
+static void ring_iowrite32options(struct tb_ring *ring, u32 value, u32 offset)
+{
+ iowrite32(value, ring_options_base(ring) + offset);
+}
+
+static bool ring_full(struct tb_ring *ring)
+{
+ return ((ring->head + 1) % ring->size) == ring->tail;
+}
+
+static bool ring_empty(struct tb_ring *ring)
+{
+ return ring->head == ring->tail;
+}
+
+/*
+ * ring_write_descriptors() - post frames from ring->queue to the controller
+ *
+ * ring->lock is held.
+ */
+static void ring_write_descriptors(struct tb_ring *ring)
+{
+ struct ring_frame *frame, *n;
+ struct ring_desc *descriptor;
+ list_for_each_entry_safe(frame, n, &ring->queue, list) {
+ if (ring_full(ring))
+ break;
+ list_move_tail(&frame->list, &ring->in_flight);
+ descriptor = &ring->descriptors[ring->head];
+ descriptor->phys = frame->buffer_phy;
+ descriptor->time = 0;
+ descriptor->flags = RING_DESC_POSTED | RING_DESC_INTERRUPT;
+ if (ring->is_tx) {
+ descriptor->length = frame->size;
+ descriptor->eof = frame->eof;
+ descriptor->sof = frame->sof;
+ }
+ ring->head = (ring->head + 1) % ring->size;
+ if (ring->is_tx)
+ ring_iowrite_prod(ring, ring->head);
+ else
+ ring_iowrite_cons(ring, ring->head);
+ }
+}
+
+/*
+ * ring_work() - progress completed frames
+ *
+ * If the ring is shutting down then all frames are marked as canceled and
+ * their callbacks are invoked.
+ *
+ * Otherwise we collect all completed frame from the ring buffer, write new
+ * frame to the ring buffer and invoke the callbacks for the completed frames.
+ */
+static void ring_work(struct work_struct *work)
+{
+ struct tb_ring *ring = container_of(work, typeof(*ring), work);
+ struct ring_frame *frame;
+ bool canceled = false;
+ unsigned long flags;
+ LIST_HEAD(done);
+
+ spin_lock_irqsave(&ring->lock, flags);
+
+ if (!ring->running) {
+ /* Move all frames to done and mark them as canceled. */
+ list_splice_tail_init(&ring->in_flight, &done);
+ list_splice_tail_init(&ring->queue, &done);
+ canceled = true;
+ goto invoke_callback;
+ }
+
+ while (!ring_empty(ring)) {
+ if (!(ring->descriptors[ring->tail].flags
+ & RING_DESC_COMPLETED))
+ break;
+ frame = list_first_entry(&ring->in_flight, typeof(*frame),
+ list);
+ list_move_tail(&frame->list, &done);
+ if (!ring->is_tx) {
+ frame->size = ring->descriptors[ring->tail].length;
+ frame->eof = ring->descriptors[ring->tail].eof;
+ frame->sof = ring->descriptors[ring->tail].sof;
+ frame->flags = ring->descriptors[ring->tail].flags;
+ }
+ ring->tail = (ring->tail + 1) % ring->size;
+ }
+ ring_write_descriptors(ring);
+
+invoke_callback:
+ /* allow callbacks to schedule new work */
+ spin_unlock_irqrestore(&ring->lock, flags);
+ while (!list_empty(&done)) {
+ frame = list_first_entry(&done, typeof(*frame), list);
+ /*
+ * The callback may reenqueue or delete frame.
+ * Do not hold on to it.
+ */
+ list_del_init(&frame->list);
+ if (frame->callback)
+ frame->callback(ring, frame, canceled);
+ }
+}
+
+int __tb_ring_enqueue(struct tb_ring *ring, struct ring_frame *frame)
+{
+ unsigned long flags;
+ int ret = 0;
+
+ spin_lock_irqsave(&ring->lock, flags);
+ if (ring->running) {
+ list_add_tail(&frame->list, &ring->queue);
+ ring_write_descriptors(ring);
+ } else {
+ ret = -ESHUTDOWN;
+ }
+ spin_unlock_irqrestore(&ring->lock, flags);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(__tb_ring_enqueue);
+
+/**
+ * tb_ring_poll() - Poll one completed frame from the ring
+ * @ring: Ring to poll
+ *
+ * This function can be called when @start_poll callback of the @ring
+ * has been called. It will read one completed frame from the ring and
+ * return it to the caller. Returns %NULL if there is no more completed
+ * frames.
+ */
+struct ring_frame *tb_ring_poll(struct tb_ring *ring)
+{
+ struct ring_frame *frame = NULL;
+ unsigned long flags;
+
+ spin_lock_irqsave(&ring->lock, flags);
+ if (!ring->running)
+ goto unlock;
+ if (ring_empty(ring))
+ goto unlock;
+
+ if (ring->descriptors[ring->tail].flags & RING_DESC_COMPLETED) {
+ frame = list_first_entry(&ring->in_flight, typeof(*frame),
+ list);
+ list_del_init(&frame->list);
+
+ if (!ring->is_tx) {
+ frame->size = ring->descriptors[ring->tail].length;
+ frame->eof = ring->descriptors[ring->tail].eof;
+ frame->sof = ring->descriptors[ring->tail].sof;
+ frame->flags = ring->descriptors[ring->tail].flags;
+ }
+
+ ring->tail = (ring->tail + 1) % ring->size;
+ }
+
+unlock:
+ spin_unlock_irqrestore(&ring->lock, flags);
+ return frame;
+}
+EXPORT_SYMBOL_GPL(tb_ring_poll);
+
+static void __ring_interrupt_mask(struct tb_ring *ring, bool mask)
+{
+ int idx = ring_interrupt_index(ring);
+ int reg = REG_RING_INTERRUPT_BASE + idx / 32 * 4;
+ int bit = idx % 32;
+ u32 val;
+
+ val = ioread32(ring->nhi->iobase + reg);
+ if (mask)
+ val &= ~BIT(bit);
+ else
+ val |= BIT(bit);
+ iowrite32(val, ring->nhi->iobase + reg);
+}
+
+/* Both @nhi->lock and @ring->lock should be held */
+static void __ring_interrupt(struct tb_ring *ring)
+{
+ if (!ring->running)
+ return;
+
+ if (ring->start_poll) {
+ __ring_interrupt_mask(ring, true);
+ ring->start_poll(ring->poll_data);
+ } else {
+ schedule_work(&ring->work);
+ }
+}
+
+/**
+ * tb_ring_poll_complete() - Re-start interrupt for the ring
+ * @ring: Ring to re-start the interrupt
+ *
+ * This will re-start (unmask) the ring interrupt once the user is done
+ * with polling.
+ */
+void tb_ring_poll_complete(struct tb_ring *ring)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&ring->nhi->lock, flags);
+ spin_lock(&ring->lock);
+ if (ring->start_poll)
+ __ring_interrupt_mask(ring, false);
+ spin_unlock(&ring->lock);
+ spin_unlock_irqrestore(&ring->nhi->lock, flags);
+}
+EXPORT_SYMBOL_GPL(tb_ring_poll_complete);
+
+static void ring_clear_msix(const struct tb_ring *ring)
+{
+ int bit;
+
+ if (ring->nhi->quirks & QUIRK_AUTO_CLEAR_INT)
+ return;
+
+ bit = ring_interrupt_index(ring) & 31;
+ if (ring->is_tx)
+ iowrite32(BIT(bit), ring->nhi->iobase + REG_RING_INT_CLEAR);
+ else
+ iowrite32(BIT(bit), ring->nhi->iobase + REG_RING_INT_CLEAR +
+ 4 * (ring->nhi->hop_count / 32));
+}
+
+static irqreturn_t ring_msix(int irq, void *data)
+{
+ struct tb_ring *ring = data;
+
+ spin_lock(&ring->nhi->lock);
+ ring_clear_msix(ring);
+ spin_lock(&ring->lock);
+ __ring_interrupt(ring);
+ spin_unlock(&ring->lock);
+ spin_unlock(&ring->nhi->lock);
+
+ return IRQ_HANDLED;
+}
+
+static int ring_request_msix(struct tb_ring *ring, bool no_suspend)
+{
+ struct tb_nhi *nhi = ring->nhi;
+ unsigned long irqflags;
+ int ret;
+
+ if (!nhi->pdev->msix_enabled)
+ return 0;
+
+ ret = ida_simple_get(&nhi->msix_ida, 0, MSIX_MAX_VECS, GFP_KERNEL);
+ if (ret < 0)
+ return ret;
+
+ ring->vector = ret;
+
+ ret = pci_irq_vector(ring->nhi->pdev, ring->vector);
+ if (ret < 0)
+ goto err_ida_remove;
+
+ ring->irq = ret;
+
+ irqflags = no_suspend ? IRQF_NO_SUSPEND : 0;
+ ret = request_irq(ring->irq, ring_msix, irqflags, "thunderbolt", ring);
+ if (ret)
+ goto err_ida_remove;
+
+ return 0;
+
+err_ida_remove:
+ ida_simple_remove(&nhi->msix_ida, ring->vector);
+
+ return ret;
+}
+
+static void ring_release_msix(struct tb_ring *ring)
+{
+ if (ring->irq <= 0)
+ return;
+
+ free_irq(ring->irq, ring);
+ ida_simple_remove(&ring->nhi->msix_ida, ring->vector);
+ ring->vector = 0;
+ ring->irq = 0;
+}
+
+static int nhi_alloc_hop(struct tb_nhi *nhi, struct tb_ring *ring)
+{
+ unsigned int start_hop = RING_FIRST_USABLE_HOPID;
+ int ret = 0;
+
+ if (nhi->quirks & QUIRK_E2E) {
+ start_hop = RING_FIRST_USABLE_HOPID + 1;
+ if (ring->flags & RING_FLAG_E2E && !ring->is_tx) {
+ dev_dbg(&nhi->pdev->dev, "quirking E2E TX HopID %u -> %u\n",
+ ring->e2e_tx_hop, RING_E2E_RESERVED_HOPID);
+ ring->e2e_tx_hop = RING_E2E_RESERVED_HOPID;
+ }
+ }
+
+ spin_lock_irq(&nhi->lock);
+
+ if (ring->hop < 0) {
+ unsigned int i;
+
+ /*
+ * Automatically allocate HopID from the non-reserved
+ * range 1 .. hop_count - 1.
+ */
+ for (i = start_hop; i < nhi->hop_count; i++) {
+ if (ring->is_tx) {
+ if (!nhi->tx_rings[i]) {
+ ring->hop = i;
+ break;
+ }
+ } else {
+ if (!nhi->rx_rings[i]) {
+ ring->hop = i;
+ break;
+ }
+ }
+ }
+ }
+
+ if (ring->hop > 0 && ring->hop < start_hop) {
+ dev_warn(&nhi->pdev->dev, "invalid hop: %d\n", ring->hop);
+ ret = -EINVAL;
+ goto err_unlock;
+ }
+ if (ring->hop < 0 || ring->hop >= nhi->hop_count) {
+ dev_warn(&nhi->pdev->dev, "invalid hop: %d\n", ring->hop);
+ ret = -EINVAL;
+ goto err_unlock;
+ }
+ if (ring->is_tx && nhi->tx_rings[ring->hop]) {
+ dev_warn(&nhi->pdev->dev, "TX hop %d already allocated\n",
+ ring->hop);
+ ret = -EBUSY;
+ goto err_unlock;
+ }
+ if (!ring->is_tx && nhi->rx_rings[ring->hop]) {
+ dev_warn(&nhi->pdev->dev, "RX hop %d already allocated\n",
+ ring->hop);
+ ret = -EBUSY;
+ goto err_unlock;
+ }
+
+ if (ring->is_tx)
+ nhi->tx_rings[ring->hop] = ring;
+ else
+ nhi->rx_rings[ring->hop] = ring;
+
+err_unlock:
+ spin_unlock_irq(&nhi->lock);
+
+ return ret;
+}
+
+static struct tb_ring *tb_ring_alloc(struct tb_nhi *nhi, u32 hop, int size,
+ bool transmit, unsigned int flags,
+ int e2e_tx_hop, u16 sof_mask, u16 eof_mask,
+ void (*start_poll)(void *),
+ void *poll_data)
+{
+ struct tb_ring *ring = NULL;
+
+ dev_dbg(&nhi->pdev->dev, "allocating %s ring %d of size %d\n",
+ transmit ? "TX" : "RX", hop, size);
+
+ ring = kzalloc(sizeof(*ring), GFP_KERNEL);
+ if (!ring)
+ return NULL;
+
+ spin_lock_init(&ring->lock);
+ INIT_LIST_HEAD(&ring->queue);
+ INIT_LIST_HEAD(&ring->in_flight);
+ INIT_WORK(&ring->work, ring_work);
+
+ ring->nhi = nhi;
+ ring->hop = hop;
+ ring->is_tx = transmit;
+ ring->size = size;
+ ring->flags = flags;
+ ring->e2e_tx_hop = e2e_tx_hop;
+ ring->sof_mask = sof_mask;
+ ring->eof_mask = eof_mask;
+ ring->head = 0;
+ ring->tail = 0;
+ ring->running = false;
+ ring->start_poll = start_poll;
+ ring->poll_data = poll_data;
+
+ ring->descriptors = dma_alloc_coherent(&ring->nhi->pdev->dev,
+ size * sizeof(*ring->descriptors),
+ &ring->descriptors_dma, GFP_KERNEL | __GFP_ZERO);
+ if (!ring->descriptors)
+ goto err_free_ring;
+
+ if (ring_request_msix(ring, flags & RING_FLAG_NO_SUSPEND))
+ goto err_free_descs;
+
+ if (nhi_alloc_hop(nhi, ring))
+ goto err_release_msix;
+
+ return ring;
+
+err_release_msix:
+ ring_release_msix(ring);
+err_free_descs:
+ dma_free_coherent(&ring->nhi->pdev->dev,
+ ring->size * sizeof(*ring->descriptors),
+ ring->descriptors, ring->descriptors_dma);
+err_free_ring:
+ kfree(ring);
+
+ return NULL;
+}
+
+/**
+ * tb_ring_alloc_tx() - Allocate DMA ring for transmit
+ * @nhi: Pointer to the NHI the ring is to be allocated
+ * @hop: HopID (ring) to allocate
+ * @size: Number of entries in the ring
+ * @flags: Flags for the ring
+ */
+struct tb_ring *tb_ring_alloc_tx(struct tb_nhi *nhi, int hop, int size,
+ unsigned int flags)
+{
+ return tb_ring_alloc(nhi, hop, size, true, flags, 0, 0, 0, NULL, NULL);
+}
+EXPORT_SYMBOL_GPL(tb_ring_alloc_tx);
+
+/**
+ * tb_ring_alloc_rx() - Allocate DMA ring for receive
+ * @nhi: Pointer to the NHI the ring is to be allocated
+ * @hop: HopID (ring) to allocate. Pass %-1 for automatic allocation.
+ * @size: Number of entries in the ring
+ * @flags: Flags for the ring
+ * @e2e_tx_hop: Transmit HopID when E2E is enabled in @flags
+ * @sof_mask: Mask of PDF values that start a frame
+ * @eof_mask: Mask of PDF values that end a frame
+ * @start_poll: If not %NULL the ring will call this function when an
+ * interrupt is triggered and masked, instead of callback
+ * in each Rx frame.
+ * @poll_data: Optional data passed to @start_poll
+ */
+struct tb_ring *tb_ring_alloc_rx(struct tb_nhi *nhi, int hop, int size,
+ unsigned int flags, int e2e_tx_hop,
+ u16 sof_mask, u16 eof_mask,
+ void (*start_poll)(void *), void *poll_data)
+{
+ return tb_ring_alloc(nhi, hop, size, false, flags, e2e_tx_hop, sof_mask, eof_mask,
+ start_poll, poll_data);
+}
+EXPORT_SYMBOL_GPL(tb_ring_alloc_rx);
+
+/**
+ * tb_ring_start() - enable a ring
+ * @ring: Ring to start
+ *
+ * Must not be invoked in parallel with tb_ring_stop().
+ */
+void tb_ring_start(struct tb_ring *ring)
+{
+ u16 frame_size;
+ u32 flags;
+
+ spin_lock_irq(&ring->nhi->lock);
+ spin_lock(&ring->lock);
+ if (ring->nhi->going_away)
+ goto err;
+ if (ring->running) {
+ dev_WARN(&ring->nhi->pdev->dev, "ring already started\n");
+ goto err;
+ }
+ dev_dbg(&ring->nhi->pdev->dev, "starting %s %d\n",
+ RING_TYPE(ring), ring->hop);
+
+ if (ring->flags & RING_FLAG_FRAME) {
+ /* Means 4096 */
+ frame_size = 0;
+ flags = RING_FLAG_ENABLE;
+ } else {
+ frame_size = TB_FRAME_SIZE;
+ flags = RING_FLAG_ENABLE | RING_FLAG_RAW;
+ }
+
+ ring_iowrite64desc(ring, ring->descriptors_dma, 0);
+ if (ring->is_tx) {
+ ring_iowrite32desc(ring, ring->size, 12);
+ ring_iowrite32options(ring, 0, 4); /* time releated ? */
+ ring_iowrite32options(ring, flags, 0);
+ } else {
+ u32 sof_eof_mask = ring->sof_mask << 16 | ring->eof_mask;
+
+ ring_iowrite32desc(ring, (frame_size << 16) | ring->size, 12);
+ ring_iowrite32options(ring, sof_eof_mask, 4);
+ ring_iowrite32options(ring, flags, 0);
+ }
+
+ /*
+ * Now that the ring valid bit is set we can configure E2E if
+ * enabled for the ring.
+ */
+ if (ring->flags & RING_FLAG_E2E) {
+ if (!ring->is_tx) {
+ u32 hop;
+
+ hop = ring->e2e_tx_hop << REG_RX_OPTIONS_E2E_HOP_SHIFT;
+ hop &= REG_RX_OPTIONS_E2E_HOP_MASK;
+ flags |= hop;
+
+ dev_dbg(&ring->nhi->pdev->dev,
+ "enabling E2E for %s %d with TX HopID %d\n",
+ RING_TYPE(ring), ring->hop, ring->e2e_tx_hop);
+ } else {
+ dev_dbg(&ring->nhi->pdev->dev, "enabling E2E for %s %d\n",
+ RING_TYPE(ring), ring->hop);
+ }
+
+ flags |= RING_FLAG_E2E_FLOW_CONTROL;
+ ring_iowrite32options(ring, flags, 0);
+ }
+
+ ring_interrupt_active(ring, true);
+ ring->running = true;
+err:
+ spin_unlock(&ring->lock);
+ spin_unlock_irq(&ring->nhi->lock);
+}
+EXPORT_SYMBOL_GPL(tb_ring_start);
+
+/**
+ * tb_ring_stop() - shutdown a ring
+ * @ring: Ring to stop
+ *
+ * Must not be invoked from a callback.
+ *
+ * This method will disable the ring. Further calls to
+ * tb_ring_tx/tb_ring_rx will return -ESHUTDOWN until ring_stop has been
+ * called.
+ *
+ * All enqueued frames will be canceled and their callbacks will be executed
+ * with frame->canceled set to true (on the callback thread). This method
+ * returns only after all callback invocations have finished.
+ */
+void tb_ring_stop(struct tb_ring *ring)
+{
+ spin_lock_irq(&ring->nhi->lock);
+ spin_lock(&ring->lock);
+ dev_dbg(&ring->nhi->pdev->dev, "stopping %s %d\n",
+ RING_TYPE(ring), ring->hop);
+ if (ring->nhi->going_away)
+ goto err;
+ if (!ring->running) {
+ dev_WARN(&ring->nhi->pdev->dev, "%s %d already stopped\n",
+ RING_TYPE(ring), ring->hop);
+ goto err;
+ }
+ ring_interrupt_active(ring, false);
+
+ ring_iowrite32options(ring, 0, 0);
+ ring_iowrite64desc(ring, 0, 0);
+ ring_iowrite32desc(ring, 0, 8);
+ ring_iowrite32desc(ring, 0, 12);
+ ring->head = 0;
+ ring->tail = 0;
+ ring->running = false;
+
+err:
+ spin_unlock(&ring->lock);
+ spin_unlock_irq(&ring->nhi->lock);
+
+ /*
+ * schedule ring->work to invoke callbacks on all remaining frames.
+ */
+ schedule_work(&ring->work);
+ flush_work(&ring->work);
+}
+EXPORT_SYMBOL_GPL(tb_ring_stop);
+
+/*
+ * tb_ring_free() - free ring
+ *
+ * When this method returns all invocations of ring->callback will have
+ * finished.
+ *
+ * Ring must be stopped.
+ *
+ * Must NOT be called from ring_frame->callback!
+ */
+void tb_ring_free(struct tb_ring *ring)
+{
+ spin_lock_irq(&ring->nhi->lock);
+ /*
+ * Dissociate the ring from the NHI. This also ensures that
+ * nhi_interrupt_work cannot reschedule ring->work.
+ */
+ if (ring->is_tx)
+ ring->nhi->tx_rings[ring->hop] = NULL;
+ else
+ ring->nhi->rx_rings[ring->hop] = NULL;
+
+ if (ring->running) {
+ dev_WARN(&ring->nhi->pdev->dev, "%s %d still running\n",
+ RING_TYPE(ring), ring->hop);
+ }
+ spin_unlock_irq(&ring->nhi->lock);
+
+ ring_release_msix(ring);
+
+ dma_free_coherent(&ring->nhi->pdev->dev,
+ ring->size * sizeof(*ring->descriptors),
+ ring->descriptors, ring->descriptors_dma);
+
+ ring->descriptors = NULL;
+ ring->descriptors_dma = 0;
+
+
+ dev_dbg(&ring->nhi->pdev->dev, "freeing %s %d\n", RING_TYPE(ring),
+ ring->hop);
+
+ /*
+ * ring->work can no longer be scheduled (it is scheduled only
+ * by nhi_interrupt_work, ring_stop and ring_msix). Wait for it
+ * to finish before freeing the ring.
+ */
+ flush_work(&ring->work);
+ kfree(ring);
+}
+EXPORT_SYMBOL_GPL(tb_ring_free);
+
+/**
+ * nhi_mailbox_cmd() - Send a command through NHI mailbox
+ * @nhi: Pointer to the NHI structure
+ * @cmd: Command to send
+ * @data: Data to be send with the command
+ *
+ * Sends mailbox command to the firmware running on NHI. Returns %0 in
+ * case of success and negative errno in case of failure.
+ */
+int nhi_mailbox_cmd(struct tb_nhi *nhi, enum nhi_mailbox_cmd cmd, u32 data)
+{
+ ktime_t timeout;
+ u32 val;
+
+ iowrite32(data, nhi->iobase + REG_INMAIL_DATA);
+
+ val = ioread32(nhi->iobase + REG_INMAIL_CMD);
+ val &= ~(REG_INMAIL_CMD_MASK | REG_INMAIL_ERROR);
+ val |= REG_INMAIL_OP_REQUEST | cmd;
+ iowrite32(val, nhi->iobase + REG_INMAIL_CMD);
+
+ timeout = ktime_add_ms(ktime_get(), NHI_MAILBOX_TIMEOUT);
+ do {
+ val = ioread32(nhi->iobase + REG_INMAIL_CMD);
+ if (!(val & REG_INMAIL_OP_REQUEST))
+ break;
+ usleep_range(10, 20);
+ } while (ktime_before(ktime_get(), timeout));
+
+ if (val & REG_INMAIL_OP_REQUEST)
+ return -ETIMEDOUT;
+ if (val & REG_INMAIL_ERROR)
+ return -EIO;
+
+ return 0;
+}
+
+/**
+ * nhi_mailbox_mode() - Return current firmware operation mode
+ * @nhi: Pointer to the NHI structure
+ *
+ * The function reads current firmware operation mode using NHI mailbox
+ * registers and returns it to the caller.
+ */
+enum nhi_fw_mode nhi_mailbox_mode(struct tb_nhi *nhi)
+{
+ u32 val;
+
+ val = ioread32(nhi->iobase + REG_OUTMAIL_CMD);
+ val &= REG_OUTMAIL_CMD_OPMODE_MASK;
+ val >>= REG_OUTMAIL_CMD_OPMODE_SHIFT;
+
+ return (enum nhi_fw_mode)val;
+}
+
+static void nhi_interrupt_work(struct work_struct *work)
+{
+ struct tb_nhi *nhi = container_of(work, typeof(*nhi), interrupt_work);
+ int value = 0; /* Suppress uninitialized usage warning. */
+ int bit;
+ int hop = -1;
+ int type = 0; /* current interrupt type 0: TX, 1: RX, 2: RX overflow */
+ struct tb_ring *ring;
+
+ spin_lock_irq(&nhi->lock);
+
+ /*
+ * Starting at REG_RING_NOTIFY_BASE there are three status bitfields
+ * (TX, RX, RX overflow). We iterate over the bits and read a new
+ * dwords as required. The registers are cleared on read.
+ */
+ for (bit = 0; bit < 3 * nhi->hop_count; bit++) {
+ if (bit % 32 == 0)
+ value = ioread32(nhi->iobase
+ + REG_RING_NOTIFY_BASE
+ + 4 * (bit / 32));
+ if (++hop == nhi->hop_count) {
+ hop = 0;
+ type++;
+ }
+ if ((value & (1 << (bit % 32))) == 0)
+ continue;
+ if (type == 2) {
+ dev_warn(&nhi->pdev->dev,
+ "RX overflow for ring %d\n",
+ hop);
+ continue;
+ }
+ if (type == 0)
+ ring = nhi->tx_rings[hop];
+ else
+ ring = nhi->rx_rings[hop];
+ if (ring == NULL) {
+ dev_warn(&nhi->pdev->dev,
+ "got interrupt for inactive %s ring %d\n",
+ type ? "RX" : "TX",
+ hop);
+ continue;
+ }
+
+ spin_lock(&ring->lock);
+ __ring_interrupt(ring);
+ spin_unlock(&ring->lock);
+ }
+ spin_unlock_irq(&nhi->lock);
+}
+
+static irqreturn_t nhi_msi(int irq, void *data)
+{
+ struct tb_nhi *nhi = data;
+ schedule_work(&nhi->interrupt_work);
+ return IRQ_HANDLED;
+}
+
+static int __nhi_suspend_noirq(struct device *dev, bool wakeup)
+{
+ struct pci_dev *pdev = to_pci_dev(dev);
+ struct tb *tb = pci_get_drvdata(pdev);
+ struct tb_nhi *nhi = tb->nhi;
+ int ret;
+
+ ret = tb_domain_suspend_noirq(tb);
+ if (ret)
+ return ret;
+
+ if (nhi->ops && nhi->ops->suspend_noirq) {
+ ret = nhi->ops->suspend_noirq(tb->nhi, wakeup);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int nhi_suspend_noirq(struct device *dev)
+{
+ return __nhi_suspend_noirq(dev, device_may_wakeup(dev));
+}
+
+static int nhi_freeze_noirq(struct device *dev)
+{
+ struct pci_dev *pdev = to_pci_dev(dev);
+ struct tb *tb = pci_get_drvdata(pdev);
+
+ return tb_domain_freeze_noirq(tb);
+}
+
+static int nhi_thaw_noirq(struct device *dev)
+{
+ struct pci_dev *pdev = to_pci_dev(dev);
+ struct tb *tb = pci_get_drvdata(pdev);
+
+ return tb_domain_thaw_noirq(tb);
+}
+
+static bool nhi_wake_supported(struct pci_dev *pdev)
+{
+ u8 val;
+
+ /*
+ * If power rails are sustainable for wakeup from S4 this
+ * property is set by the BIOS.
+ */
+ if (device_property_read_u8(&pdev->dev, "WAKE_SUPPORTED", &val))
+ return !!val;
+
+ return true;
+}
+
+static int nhi_poweroff_noirq(struct device *dev)
+{
+ struct pci_dev *pdev = to_pci_dev(dev);
+ bool wakeup;
+
+ wakeup = device_may_wakeup(dev) && nhi_wake_supported(pdev);
+ return __nhi_suspend_noirq(dev, wakeup);
+}
+
+static void nhi_enable_int_throttling(struct tb_nhi *nhi)
+{
+ /* Throttling is specified in 256ns increments */
+ u32 throttle = DIV_ROUND_UP(128 * NSEC_PER_USEC, 256);
+ unsigned int i;
+
+ /*
+ * Configure interrupt throttling for all vectors even if we
+ * only use few.
+ */
+ for (i = 0; i < MSIX_MAX_VECS; i++) {
+ u32 reg = REG_INT_THROTTLING_RATE + i * 4;
+ iowrite32(throttle, nhi->iobase + reg);
+ }
+}
+
+static int nhi_resume_noirq(struct device *dev)
+{
+ struct pci_dev *pdev = to_pci_dev(dev);
+ struct tb *tb = pci_get_drvdata(pdev);
+ struct tb_nhi *nhi = tb->nhi;
+ int ret;
+
+ /*
+ * Check that the device is still there. It may be that the user
+ * unplugged last device which causes the host controller to go
+ * away on PCs.
+ */
+ if (!pci_device_is_present(pdev)) {
+ nhi->going_away = true;
+ } else {
+ if (nhi->ops && nhi->ops->resume_noirq) {
+ ret = nhi->ops->resume_noirq(nhi);
+ if (ret)
+ return ret;
+ }
+ nhi_enable_int_throttling(tb->nhi);
+ }
+
+ return tb_domain_resume_noirq(tb);
+}
+
+static int nhi_suspend(struct device *dev)
+{
+ struct pci_dev *pdev = to_pci_dev(dev);
+ struct tb *tb = pci_get_drvdata(pdev);
+
+ return tb_domain_suspend(tb);
+}
+
+static void nhi_complete(struct device *dev)
+{
+ struct pci_dev *pdev = to_pci_dev(dev);
+ struct tb *tb = pci_get_drvdata(pdev);
+
+ /*
+ * If we were runtime suspended when system suspend started,
+ * schedule runtime resume now. It should bring the domain back
+ * to functional state.
+ */
+ if (pm_runtime_suspended(&pdev->dev))
+ pm_runtime_resume(&pdev->dev);
+ else
+ tb_domain_complete(tb);
+}
+
+static int nhi_runtime_suspend(struct device *dev)
+{
+ struct pci_dev *pdev = to_pci_dev(dev);
+ struct tb *tb = pci_get_drvdata(pdev);
+ struct tb_nhi *nhi = tb->nhi;
+ int ret;
+
+ ret = tb_domain_runtime_suspend(tb);
+ if (ret)
+ return ret;
+
+ if (nhi->ops && nhi->ops->runtime_suspend) {
+ ret = nhi->ops->runtime_suspend(tb->nhi);
+ if (ret)
+ return ret;
+ }
+ return 0;
+}
+
+static int nhi_runtime_resume(struct device *dev)
+{
+ struct pci_dev *pdev = to_pci_dev(dev);
+ struct tb *tb = pci_get_drvdata(pdev);
+ struct tb_nhi *nhi = tb->nhi;
+ int ret;
+
+ if (nhi->ops && nhi->ops->runtime_resume) {
+ ret = nhi->ops->runtime_resume(nhi);
+ if (ret)
+ return ret;
+ }
+
+ nhi_enable_int_throttling(nhi);
+ return tb_domain_runtime_resume(tb);
+}
+
+static void nhi_shutdown(struct tb_nhi *nhi)
+{
+ int i;
+
+ dev_dbg(&nhi->pdev->dev, "shutdown\n");
+
+ for (i = 0; i < nhi->hop_count; i++) {
+ if (nhi->tx_rings[i])
+ dev_WARN(&nhi->pdev->dev,
+ "TX ring %d is still active\n", i);
+ if (nhi->rx_rings[i])
+ dev_WARN(&nhi->pdev->dev,
+ "RX ring %d is still active\n", i);
+ }
+ nhi_disable_interrupts(nhi);
+ /*
+ * We have to release the irq before calling flush_work. Otherwise an
+ * already executing IRQ handler could call schedule_work again.
+ */
+ if (!nhi->pdev->msix_enabled) {
+ devm_free_irq(&nhi->pdev->dev, nhi->pdev->irq, nhi);
+ flush_work(&nhi->interrupt_work);
+ }
+ ida_destroy(&nhi->msix_ida);
+
+ if (nhi->ops && nhi->ops->shutdown)
+ nhi->ops->shutdown(nhi);
+}
+
+static void nhi_check_quirks(struct tb_nhi *nhi)
+{
+ if (nhi->pdev->vendor == PCI_VENDOR_ID_INTEL) {
+ /*
+ * Intel hardware supports auto clear of the interrupt
+ * status register right after interrupt is being
+ * issued.
+ */
+ nhi->quirks |= QUIRK_AUTO_CLEAR_INT;
+
+ switch (nhi->pdev->device) {
+ case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_NHI:
+ case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_NHI:
+ /*
+ * Falcon Ridge controller needs the end-to-end
+ * flow control workaround to avoid losing Rx
+ * packets when RING_FLAG_E2E is set.
+ */
+ nhi->quirks |= QUIRK_E2E;
+ break;
+ }
+ }
+}
+
+static int nhi_check_iommu_pdev(struct pci_dev *pdev, void *data)
+{
+ if (!pdev->external_facing ||
+ !device_iommu_capable(&pdev->dev, IOMMU_CAP_PRE_BOOT_PROTECTION))
+ return 0;
+ *(bool *)data = true;
+ return 1; /* Stop walking */
+}
+
+static void nhi_check_iommu(struct tb_nhi *nhi)
+{
+ struct pci_bus *bus = nhi->pdev->bus;
+ bool port_ok = false;
+
+ /*
+ * Ideally what we'd do here is grab every PCI device that
+ * represents a tunnelling adapter for this NHI and check their
+ * status directly, but unfortunately USB4 seems to make it
+ * obnoxiously difficult to reliably make any correlation.
+ *
+ * So for now we'll have to bodge it... Hoping that the system
+ * is at least sane enough that an adapter is in the same PCI
+ * segment as its NHI, if we can find *something* on that segment
+ * which meets the requirements for Kernel DMA Protection, we'll
+ * take that to imply that firmware is aware and has (hopefully)
+ * done the right thing in general. We need to know that the PCI
+ * layer has seen the ExternalFacingPort property which will then
+ * inform the IOMMU layer to enforce the complete "untrusted DMA"
+ * flow, but also that the IOMMU driver itself can be trusted not
+ * to have been subverted by a pre-boot DMA attack.
+ */
+ while (bus->parent)
+ bus = bus->parent;
+
+ pci_walk_bus(bus, nhi_check_iommu_pdev, &port_ok);
+
+ nhi->iommu_dma_protection = port_ok;
+ dev_dbg(&nhi->pdev->dev, "IOMMU DMA protection is %s\n",
+ str_enabled_disabled(port_ok));
+}
+
+static void nhi_reset(struct tb_nhi *nhi)
+{
+ ktime_t timeout;
+ u32 val;
+
+ val = ioread32(nhi->iobase + REG_CAPS);
+ /* Reset only v2 and later routers */
+ if (FIELD_GET(REG_CAPS_VERSION_MASK, val) < REG_CAPS_VERSION_2)
+ return;
+
+ if (!host_reset) {
+ dev_dbg(&nhi->pdev->dev, "skipping host router reset\n");
+ return;
+ }
+
+ iowrite32(REG_RESET_HRR, nhi->iobase + REG_RESET);
+ msleep(100);
+
+ timeout = ktime_add_ms(ktime_get(), 500);
+ do {
+ val = ioread32(nhi->iobase + REG_RESET);
+ if (!(val & REG_RESET_HRR)) {
+ dev_warn(&nhi->pdev->dev, "host router reset successful\n");
+ return;
+ }
+ usleep_range(10, 20);
+ } while (ktime_before(ktime_get(), timeout));
+
+ dev_warn(&nhi->pdev->dev, "timeout resetting host router\n");
+}
+
+static int nhi_init_msi(struct tb_nhi *nhi)
+{
+ struct pci_dev *pdev = nhi->pdev;
+ struct device *dev = &pdev->dev;
+ int res, irq, nvec;
+
+ /* In case someone left them on. */
+ nhi_disable_interrupts(nhi);
+
+ nhi_enable_int_throttling(nhi);
+
+ ida_init(&nhi->msix_ida);
+
+ /*
+ * The NHI has 16 MSI-X vectors or a single MSI. We first try to
+ * get all MSI-X vectors and if we succeed, each ring will have
+ * one MSI-X. If for some reason that does not work out, we
+ * fallback to a single MSI.
+ */
+ nvec = pci_alloc_irq_vectors(pdev, MSIX_MIN_VECS, MSIX_MAX_VECS,
+ PCI_IRQ_MSIX);
+ if (nvec < 0) {
+ nvec = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_MSI);
+ if (nvec < 0)
+ return nvec;
+
+ INIT_WORK(&nhi->interrupt_work, nhi_interrupt_work);
+
+ irq = pci_irq_vector(nhi->pdev, 0);
+ if (irq < 0)
+ return irq;
+
+ res = devm_request_irq(&pdev->dev, irq, nhi_msi,
+ IRQF_NO_SUSPEND, "thunderbolt", nhi);
+ if (res)
+ return dev_err_probe(dev, res, "request_irq failed, aborting\n");
+ }
+
+ return 0;
+}
+
+static bool nhi_imr_valid(struct pci_dev *pdev)
+{
+ u8 val;
+
+ if (!device_property_read_u8(&pdev->dev, "IMR_VALID", &val))
+ return !!val;
+
+ return true;
+}
+
+static struct tb *nhi_select_cm(struct tb_nhi *nhi)
+{
+ struct tb *tb;
+
+ /*
+ * USB4 case is simple. If we got control of any of the
+ * capabilities, we use software CM.
+ */
+ if (tb_acpi_is_native())
+ return tb_probe(nhi);
+
+ /*
+ * Either firmware based CM is running (we did not get control
+ * from the firmware) or this is pre-USB4 PC so try first
+ * firmware CM and then fallback to software CM.
+ */
+ tb = icm_probe(nhi);
+ if (!tb)
+ tb = tb_probe(nhi);
+
+ return tb;
+}
+
+static int nhi_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+ struct device *dev = &pdev->dev;
+ struct tb_nhi *nhi;
+ struct tb *tb;
+ int res;
+
+ if (!nhi_imr_valid(pdev))
+ return dev_err_probe(dev, -ENODEV, "firmware image not valid, aborting\n");
+
+ res = pcim_enable_device(pdev);
+ if (res)
+ return dev_err_probe(dev, res, "cannot enable PCI device, aborting\n");
+
+ res = pcim_iomap_regions(pdev, 1 << 0, "thunderbolt");
+ if (res)
+ return dev_err_probe(dev, res, "cannot obtain PCI resources, aborting\n");
+
+ nhi = devm_kzalloc(&pdev->dev, sizeof(*nhi), GFP_KERNEL);
+ if (!nhi)
+ return -ENOMEM;
+
+ nhi->pdev = pdev;
+ nhi->ops = (const struct tb_nhi_ops *)id->driver_data;
+ /* cannot fail - table is allocated in pcim_iomap_regions */
+ nhi->iobase = pcim_iomap_table(pdev)[0];
+ nhi->hop_count = ioread32(nhi->iobase + REG_CAPS) & 0x3ff;
+ dev_dbg(dev, "total paths: %d\n", nhi->hop_count);
+
+ nhi->tx_rings = devm_kcalloc(&pdev->dev, nhi->hop_count,
+ sizeof(*nhi->tx_rings), GFP_KERNEL);
+ nhi->rx_rings = devm_kcalloc(&pdev->dev, nhi->hop_count,
+ sizeof(*nhi->rx_rings), GFP_KERNEL);
+ if (!nhi->tx_rings || !nhi->rx_rings)
+ return -ENOMEM;
+
+ nhi_check_quirks(nhi);
+ nhi_check_iommu(nhi);
+
+ nhi_reset(nhi);
+
+ res = nhi_init_msi(nhi);
+ if (res)
+ return dev_err_probe(dev, res, "cannot enable MSI, aborting\n");
+
+ spin_lock_init(&nhi->lock);
+
+ res = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
+ if (res)
+ return dev_err_probe(dev, res, "failed to set DMA mask\n");
+
+ pci_set_master(pdev);
+
+ if (nhi->ops && nhi->ops->init) {
+ res = nhi->ops->init(nhi);
+ if (res)
+ return res;
+ }
+
+ tb = nhi_select_cm(nhi);
+ if (!tb)
+ return dev_err_probe(dev, -ENODEV,
+ "failed to determine connection manager, aborting\n");
+
+ dev_dbg(dev, "NHI initialized, starting thunderbolt\n");
+
+ res = tb_domain_add(tb);
+ if (res) {
+ /*
+ * At this point the RX/TX rings might already have been
+ * activated. Do a proper shutdown.
+ */
+ tb_domain_put(tb);
+ nhi_shutdown(nhi);
+ return res;
+ }
+ pci_set_drvdata(pdev, tb);
+
+ device_wakeup_enable(&pdev->dev);
+
+ pm_runtime_allow(&pdev->dev);
+ pm_runtime_set_autosuspend_delay(&pdev->dev, TB_AUTOSUSPEND_DELAY);
+ pm_runtime_use_autosuspend(&pdev->dev);
+ pm_runtime_put_autosuspend(&pdev->dev);
+
+ return 0;
+}
+
+static void nhi_remove(struct pci_dev *pdev)
+{
+ struct tb *tb = pci_get_drvdata(pdev);
+ struct tb_nhi *nhi = tb->nhi;
+
+ pm_runtime_get_sync(&pdev->dev);
+ pm_runtime_dont_use_autosuspend(&pdev->dev);
+ pm_runtime_forbid(&pdev->dev);
+
+ tb_domain_remove(tb);
+ nhi_shutdown(nhi);
+}
+
+/*
+ * The tunneled pci bridges are siblings of us. Use resume_noirq to reenable
+ * the tunnels asap. A corresponding pci quirk blocks the downstream bridges
+ * resume_noirq until we are done.
+ */
+static const struct dev_pm_ops nhi_pm_ops = {
+ .suspend_noirq = nhi_suspend_noirq,
+ .resume_noirq = nhi_resume_noirq,
+ .freeze_noirq = nhi_freeze_noirq, /*
+ * we just disable hotplug, the
+ * pci-tunnels stay alive.
+ */
+ .thaw_noirq = nhi_thaw_noirq,
+ .restore_noirq = nhi_resume_noirq,
+ .suspend = nhi_suspend,
+ .poweroff_noirq = nhi_poweroff_noirq,
+ .poweroff = nhi_suspend,
+ .complete = nhi_complete,
+ .runtime_suspend = nhi_runtime_suspend,
+ .runtime_resume = nhi_runtime_resume,
+};
+
+static struct pci_device_id nhi_ids[] = {
+ /*
+ * We have to specify class, the TB bridges use the same device and
+ * vendor (sub)id on gen 1 and gen 2 controllers.
+ */
+ {
+ .class = PCI_CLASS_SYSTEM_OTHER << 8, .class_mask = ~0,
+ .vendor = PCI_VENDOR_ID_INTEL,
+ .device = PCI_DEVICE_ID_INTEL_LIGHT_RIDGE,
+ .subvendor = 0x2222, .subdevice = 0x1111,
+ },
+ {
+ .class = PCI_CLASS_SYSTEM_OTHER << 8, .class_mask = ~0,
+ .vendor = PCI_VENDOR_ID_INTEL,
+ .device = PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_4C,
+ .subvendor = 0x2222, .subdevice = 0x1111,
+ },
+ {
+ .class = PCI_CLASS_SYSTEM_OTHER << 8, .class_mask = ~0,
+ .vendor = PCI_VENDOR_ID_INTEL,
+ .device = PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_NHI,
+ .subvendor = PCI_ANY_ID, .subdevice = PCI_ANY_ID,
+ },
+ {
+ .class = PCI_CLASS_SYSTEM_OTHER << 8, .class_mask = ~0,
+ .vendor = PCI_VENDOR_ID_INTEL,
+ .device = PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_NHI,
+ .subvendor = PCI_ANY_ID, .subdevice = PCI_ANY_ID,
+ },
+
+ /* Thunderbolt 3 */
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_2C_NHI) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_NHI) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_USBONLY_NHI) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_NHI) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_USBONLY_NHI) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_NHI) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_NHI) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_USBONLY_NHI) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_TITAN_RIDGE_2C_NHI) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_TITAN_RIDGE_4C_NHI) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ICL_NHI0),
+ .driver_data = (kernel_ulong_t)&icl_nhi_ops },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ICL_NHI1),
+ .driver_data = (kernel_ulong_t)&icl_nhi_ops },
+ /* Thunderbolt 4 */
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_TGL_NHI0),
+ .driver_data = (kernel_ulong_t)&icl_nhi_ops },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_TGL_NHI1),
+ .driver_data = (kernel_ulong_t)&icl_nhi_ops },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_TGL_H_NHI0),
+ .driver_data = (kernel_ulong_t)&icl_nhi_ops },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_TGL_H_NHI1),
+ .driver_data = (kernel_ulong_t)&icl_nhi_ops },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ADL_NHI0),
+ .driver_data = (kernel_ulong_t)&icl_nhi_ops },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ADL_NHI1),
+ .driver_data = (kernel_ulong_t)&icl_nhi_ops },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_RPL_NHI0),
+ .driver_data = (kernel_ulong_t)&icl_nhi_ops },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_RPL_NHI1),
+ .driver_data = (kernel_ulong_t)&icl_nhi_ops },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_MTL_M_NHI0),
+ .driver_data = (kernel_ulong_t)&icl_nhi_ops },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_MTL_P_NHI0),
+ .driver_data = (kernel_ulong_t)&icl_nhi_ops },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_MTL_P_NHI1),
+ .driver_data = (kernel_ulong_t)&icl_nhi_ops },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_BARLOW_RIDGE_HOST_80G_NHI) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_BARLOW_RIDGE_HOST_40G_NHI) },
+
+ /* Any USB4 compliant host */
+ { PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_USB_USB4, ~0) },
+
+ { 0,}
+};
+
+MODULE_DEVICE_TABLE(pci, nhi_ids);
+MODULE_DESCRIPTION("Thunderbolt/USB4 core driver");
+MODULE_LICENSE("GPL");
+
+static struct pci_driver nhi_driver = {
+ .name = "thunderbolt",
+ .id_table = nhi_ids,
+ .probe = nhi_probe,
+ .remove = nhi_remove,
+ .shutdown = nhi_remove,
+ .driver.pm = &nhi_pm_ops,
+};
+
+static int __init nhi_init(void)
+{
+ int ret;
+
+ ret = tb_domain_init();
+ if (ret)
+ return ret;
+ ret = pci_register_driver(&nhi_driver);
+ if (ret)
+ tb_domain_exit();
+ return ret;
+}
+
+static void __exit nhi_unload(void)
+{
+ pci_unregister_driver(&nhi_driver);
+ tb_domain_exit();
+}
+
+rootfs_initcall(nhi_init);
+module_exit(nhi_unload);