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![Greg Kroah-Hartman](/assets/img/avatar_default.png)
We want the fixes in here as well. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1196 lines
30 KiB
C
1196 lines
30 KiB
C
/*
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* Thunderbolt driver - NHI driver
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*
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* The NHI (native host interface) is the pci device that allows us to send and
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* receive frames from the thunderbolt bus.
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*
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* Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
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* Copyright (C) 2018, Intel Corporation
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*/
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#include <linux/pm_runtime.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/pci.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/delay.h>
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#include "nhi.h"
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#include "nhi_regs.h"
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#include "tb.h"
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#define RING_TYPE(ring) ((ring)->is_tx ? "TX ring" : "RX ring")
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/*
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* Used to enable end-to-end workaround for missing RX packets. Do not
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* use this ring for anything else.
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*/
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#define RING_E2E_UNUSED_HOPID 2
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/* HopIDs 0-7 are reserved by the Thunderbolt protocol */
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#define RING_FIRST_USABLE_HOPID 8
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/*
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* Minimal number of vectors when we use MSI-X. Two for control channel
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* Rx/Tx and the rest four are for cross domain DMA paths.
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*/
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#define MSIX_MIN_VECS 6
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#define MSIX_MAX_VECS 16
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#define NHI_MAILBOX_TIMEOUT 500 /* ms */
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static int ring_interrupt_index(struct tb_ring *ring)
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{
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int bit = ring->hop;
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if (!ring->is_tx)
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bit += ring->nhi->hop_count;
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return bit;
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}
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/**
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* ring_interrupt_active() - activate/deactivate interrupts for a single ring
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*
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* ring->nhi->lock must be held.
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*/
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static void ring_interrupt_active(struct tb_ring *ring, bool active)
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{
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int reg = REG_RING_INTERRUPT_BASE +
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ring_interrupt_index(ring) / 32 * 4;
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int bit = ring_interrupt_index(ring) & 31;
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int mask = 1 << bit;
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u32 old, new;
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if (ring->irq > 0) {
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u32 step, shift, ivr, misc;
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void __iomem *ivr_base;
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int index;
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if (ring->is_tx)
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index = ring->hop;
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else
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index = ring->hop + ring->nhi->hop_count;
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/*
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* Ask the hardware to clear interrupt status bits automatically
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* since we already know which interrupt was triggered.
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*/
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misc = ioread32(ring->nhi->iobase + REG_DMA_MISC);
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if (!(misc & REG_DMA_MISC_INT_AUTO_CLEAR)) {
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misc |= REG_DMA_MISC_INT_AUTO_CLEAR;
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iowrite32(misc, ring->nhi->iobase + REG_DMA_MISC);
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}
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ivr_base = ring->nhi->iobase + REG_INT_VEC_ALLOC_BASE;
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step = index / REG_INT_VEC_ALLOC_REGS * REG_INT_VEC_ALLOC_BITS;
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shift = index % REG_INT_VEC_ALLOC_REGS * REG_INT_VEC_ALLOC_BITS;
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ivr = ioread32(ivr_base + step);
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ivr &= ~(REG_INT_VEC_ALLOC_MASK << shift);
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if (active)
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ivr |= ring->vector << shift;
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iowrite32(ivr, ivr_base + step);
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}
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old = ioread32(ring->nhi->iobase + reg);
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if (active)
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new = old | mask;
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else
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new = old & ~mask;
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dev_dbg(&ring->nhi->pdev->dev,
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"%s interrupt at register %#x bit %d (%#x -> %#x)\n",
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active ? "enabling" : "disabling", reg, bit, old, new);
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if (new == old)
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dev_WARN(&ring->nhi->pdev->dev,
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"interrupt for %s %d is already %s\n",
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RING_TYPE(ring), ring->hop,
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active ? "enabled" : "disabled");
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iowrite32(new, ring->nhi->iobase + reg);
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}
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/**
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* nhi_disable_interrupts() - disable interrupts for all rings
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*
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* Use only during init and shutdown.
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*/
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static void nhi_disable_interrupts(struct tb_nhi *nhi)
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{
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int i = 0;
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/* disable interrupts */
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for (i = 0; i < RING_INTERRUPT_REG_COUNT(nhi); i++)
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iowrite32(0, nhi->iobase + REG_RING_INTERRUPT_BASE + 4 * i);
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/* clear interrupt status bits */
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for (i = 0; i < RING_NOTIFY_REG_COUNT(nhi); i++)
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ioread32(nhi->iobase + REG_RING_NOTIFY_BASE + 4 * i);
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}
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/* ring helper methods */
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static void __iomem *ring_desc_base(struct tb_ring *ring)
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{
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void __iomem *io = ring->nhi->iobase;
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io += ring->is_tx ? REG_TX_RING_BASE : REG_RX_RING_BASE;
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io += ring->hop * 16;
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return io;
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}
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static void __iomem *ring_options_base(struct tb_ring *ring)
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{
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void __iomem *io = ring->nhi->iobase;
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io += ring->is_tx ? REG_TX_OPTIONS_BASE : REG_RX_OPTIONS_BASE;
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io += ring->hop * 32;
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return io;
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}
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static void ring_iowrite16desc(struct tb_ring *ring, u32 value, u32 offset)
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{
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iowrite16(value, ring_desc_base(ring) + offset);
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}
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static void ring_iowrite32desc(struct tb_ring *ring, u32 value, u32 offset)
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{
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iowrite32(value, ring_desc_base(ring) + offset);
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}
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static void ring_iowrite64desc(struct tb_ring *ring, u64 value, u32 offset)
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{
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iowrite32(value, ring_desc_base(ring) + offset);
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iowrite32(value >> 32, ring_desc_base(ring) + offset + 4);
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}
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static void ring_iowrite32options(struct tb_ring *ring, u32 value, u32 offset)
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{
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iowrite32(value, ring_options_base(ring) + offset);
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}
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static bool ring_full(struct tb_ring *ring)
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{
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return ((ring->head + 1) % ring->size) == ring->tail;
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}
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static bool ring_empty(struct tb_ring *ring)
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{
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return ring->head == ring->tail;
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}
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/**
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* ring_write_descriptors() - post frames from ring->queue to the controller
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*
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* ring->lock is held.
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*/
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static void ring_write_descriptors(struct tb_ring *ring)
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{
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struct ring_frame *frame, *n;
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struct ring_desc *descriptor;
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list_for_each_entry_safe(frame, n, &ring->queue, list) {
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if (ring_full(ring))
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break;
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list_move_tail(&frame->list, &ring->in_flight);
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descriptor = &ring->descriptors[ring->head];
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descriptor->phys = frame->buffer_phy;
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descriptor->time = 0;
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descriptor->flags = RING_DESC_POSTED | RING_DESC_INTERRUPT;
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if (ring->is_tx) {
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descriptor->length = frame->size;
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descriptor->eof = frame->eof;
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descriptor->sof = frame->sof;
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}
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ring->head = (ring->head + 1) % ring->size;
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ring_iowrite16desc(ring, ring->head, ring->is_tx ? 10 : 8);
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}
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}
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/**
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* ring_work() - progress completed frames
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*
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* If the ring is shutting down then all frames are marked as canceled and
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* their callbacks are invoked.
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*
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* Otherwise we collect all completed frame from the ring buffer, write new
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* frame to the ring buffer and invoke the callbacks for the completed frames.
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*/
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static void ring_work(struct work_struct *work)
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{
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struct tb_ring *ring = container_of(work, typeof(*ring), work);
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struct ring_frame *frame;
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bool canceled = false;
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unsigned long flags;
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LIST_HEAD(done);
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spin_lock_irqsave(&ring->lock, flags);
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if (!ring->running) {
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/* Move all frames to done and mark them as canceled. */
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list_splice_tail_init(&ring->in_flight, &done);
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list_splice_tail_init(&ring->queue, &done);
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canceled = true;
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goto invoke_callback;
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}
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while (!ring_empty(ring)) {
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if (!(ring->descriptors[ring->tail].flags
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& RING_DESC_COMPLETED))
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break;
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frame = list_first_entry(&ring->in_flight, typeof(*frame),
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list);
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list_move_tail(&frame->list, &done);
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if (!ring->is_tx) {
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frame->size = ring->descriptors[ring->tail].length;
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frame->eof = ring->descriptors[ring->tail].eof;
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frame->sof = ring->descriptors[ring->tail].sof;
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frame->flags = ring->descriptors[ring->tail].flags;
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}
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ring->tail = (ring->tail + 1) % ring->size;
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}
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ring_write_descriptors(ring);
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invoke_callback:
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/* allow callbacks to schedule new work */
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spin_unlock_irqrestore(&ring->lock, flags);
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while (!list_empty(&done)) {
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frame = list_first_entry(&done, typeof(*frame), list);
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/*
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* The callback may reenqueue or delete frame.
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* Do not hold on to it.
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*/
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list_del_init(&frame->list);
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if (frame->callback)
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frame->callback(ring, frame, canceled);
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}
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}
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int __tb_ring_enqueue(struct tb_ring *ring, struct ring_frame *frame)
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{
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unsigned long flags;
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int ret = 0;
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spin_lock_irqsave(&ring->lock, flags);
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if (ring->running) {
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list_add_tail(&frame->list, &ring->queue);
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ring_write_descriptors(ring);
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} else {
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ret = -ESHUTDOWN;
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}
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spin_unlock_irqrestore(&ring->lock, flags);
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return ret;
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}
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EXPORT_SYMBOL_GPL(__tb_ring_enqueue);
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/**
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* tb_ring_poll() - Poll one completed frame from the ring
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* @ring: Ring to poll
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*
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* This function can be called when @start_poll callback of the @ring
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* has been called. It will read one completed frame from the ring and
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* return it to the caller. Returns %NULL if there is no more completed
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* frames.
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*/
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struct ring_frame *tb_ring_poll(struct tb_ring *ring)
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{
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struct ring_frame *frame = NULL;
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unsigned long flags;
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spin_lock_irqsave(&ring->lock, flags);
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if (!ring->running)
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goto unlock;
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if (ring_empty(ring))
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goto unlock;
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if (ring->descriptors[ring->tail].flags & RING_DESC_COMPLETED) {
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frame = list_first_entry(&ring->in_flight, typeof(*frame),
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list);
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list_del_init(&frame->list);
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if (!ring->is_tx) {
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frame->size = ring->descriptors[ring->tail].length;
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frame->eof = ring->descriptors[ring->tail].eof;
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frame->sof = ring->descriptors[ring->tail].sof;
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frame->flags = ring->descriptors[ring->tail].flags;
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}
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ring->tail = (ring->tail + 1) % ring->size;
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}
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unlock:
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spin_unlock_irqrestore(&ring->lock, flags);
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return frame;
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}
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EXPORT_SYMBOL_GPL(tb_ring_poll);
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static void __ring_interrupt_mask(struct tb_ring *ring, bool mask)
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{
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int idx = ring_interrupt_index(ring);
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int reg = REG_RING_INTERRUPT_BASE + idx / 32 * 4;
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int bit = idx % 32;
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u32 val;
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val = ioread32(ring->nhi->iobase + reg);
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if (mask)
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val &= ~BIT(bit);
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else
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val |= BIT(bit);
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iowrite32(val, ring->nhi->iobase + reg);
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}
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/* Both @nhi->lock and @ring->lock should be held */
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static void __ring_interrupt(struct tb_ring *ring)
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{
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if (!ring->running)
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return;
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if (ring->start_poll) {
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__ring_interrupt_mask(ring, true);
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ring->start_poll(ring->poll_data);
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} else {
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schedule_work(&ring->work);
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}
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}
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/**
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* tb_ring_poll_complete() - Re-start interrupt for the ring
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* @ring: Ring to re-start the interrupt
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*
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* This will re-start (unmask) the ring interrupt once the user is done
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* with polling.
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*/
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void tb_ring_poll_complete(struct tb_ring *ring)
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{
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unsigned long flags;
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spin_lock_irqsave(&ring->nhi->lock, flags);
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spin_lock(&ring->lock);
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if (ring->start_poll)
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__ring_interrupt_mask(ring, false);
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spin_unlock(&ring->lock);
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spin_unlock_irqrestore(&ring->nhi->lock, flags);
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}
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EXPORT_SYMBOL_GPL(tb_ring_poll_complete);
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static irqreturn_t ring_msix(int irq, void *data)
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{
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struct tb_ring *ring = data;
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spin_lock(&ring->nhi->lock);
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spin_lock(&ring->lock);
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__ring_interrupt(ring);
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spin_unlock(&ring->lock);
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spin_unlock(&ring->nhi->lock);
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return IRQ_HANDLED;
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}
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static int ring_request_msix(struct tb_ring *ring, bool no_suspend)
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{
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struct tb_nhi *nhi = ring->nhi;
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unsigned long irqflags;
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int ret;
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if (!nhi->pdev->msix_enabled)
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return 0;
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ret = ida_simple_get(&nhi->msix_ida, 0, MSIX_MAX_VECS, GFP_KERNEL);
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if (ret < 0)
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return ret;
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ring->vector = ret;
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ring->irq = pci_irq_vector(ring->nhi->pdev, ring->vector);
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if (ring->irq < 0)
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return ring->irq;
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irqflags = no_suspend ? IRQF_NO_SUSPEND : 0;
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return request_irq(ring->irq, ring_msix, irqflags, "thunderbolt", ring);
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}
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static void ring_release_msix(struct tb_ring *ring)
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{
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if (ring->irq <= 0)
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return;
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free_irq(ring->irq, ring);
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ida_simple_remove(&ring->nhi->msix_ida, ring->vector);
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ring->vector = 0;
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ring->irq = 0;
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}
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static int nhi_alloc_hop(struct tb_nhi *nhi, struct tb_ring *ring)
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{
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int ret = 0;
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spin_lock_irq(&nhi->lock);
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if (ring->hop < 0) {
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unsigned int i;
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/*
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* Automatically allocate HopID from the non-reserved
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* range 8 .. hop_count - 1.
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*/
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for (i = RING_FIRST_USABLE_HOPID; i < nhi->hop_count; i++) {
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if (ring->is_tx) {
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if (!nhi->tx_rings[i]) {
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ring->hop = i;
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break;
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}
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} else {
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if (!nhi->rx_rings[i]) {
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ring->hop = i;
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break;
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}
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}
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}
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}
|
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|
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if (ring->hop < 0 || ring->hop >= nhi->hop_count) {
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dev_warn(&nhi->pdev->dev, "invalid hop: %d\n", ring->hop);
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ret = -EINVAL;
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goto err_unlock;
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}
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if (ring->is_tx && nhi->tx_rings[ring->hop]) {
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dev_warn(&nhi->pdev->dev, "TX hop %d already allocated\n",
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ring->hop);
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ret = -EBUSY;
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goto err_unlock;
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} else if (!ring->is_tx && nhi->rx_rings[ring->hop]) {
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dev_warn(&nhi->pdev->dev, "RX hop %d already allocated\n",
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ring->hop);
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ret = -EBUSY;
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goto err_unlock;
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}
|
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if (ring->is_tx)
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nhi->tx_rings[ring->hop] = ring;
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else
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nhi->rx_rings[ring->hop] = ring;
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err_unlock:
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spin_unlock_irq(&nhi->lock);
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return ret;
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}
|
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|
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static struct tb_ring *tb_ring_alloc(struct tb_nhi *nhi, u32 hop, int size,
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bool transmit, unsigned int flags,
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u16 sof_mask, u16 eof_mask,
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void (*start_poll)(void *),
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void *poll_data)
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{
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struct tb_ring *ring = NULL;
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dev_dbg(&nhi->pdev->dev, "allocating %s ring %d of size %d\n",
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transmit ? "TX" : "RX", hop, size);
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/* Tx Ring 2 is reserved for E2E workaround */
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if (transmit && hop == RING_E2E_UNUSED_HOPID)
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return NULL;
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ring = kzalloc(sizeof(*ring), GFP_KERNEL);
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if (!ring)
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return NULL;
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|
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spin_lock_init(&ring->lock);
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INIT_LIST_HEAD(&ring->queue);
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INIT_LIST_HEAD(&ring->in_flight);
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INIT_WORK(&ring->work, ring_work);
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ring->nhi = nhi;
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ring->hop = hop;
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ring->is_tx = transmit;
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ring->size = size;
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ring->flags = flags;
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ring->sof_mask = sof_mask;
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ring->eof_mask = eof_mask;
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ring->head = 0;
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ring->tail = 0;
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ring->running = false;
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ring->start_poll = start_poll;
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ring->poll_data = poll_data;
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|
|
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ring->descriptors = dma_alloc_coherent(&ring->nhi->pdev->dev,
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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, 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
|
|
* @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, u16 sof_mask, u16 eof_mask,
|
|
void (*start_poll)(void *), void *poll_data)
|
|
{
|
|
return tb_ring_alloc(nhi, hop, size, false, flags, sof_mask, eof_mask,
|
|
start_poll, poll_data);
|
|
}
|
|
EXPORT_SYMBOL_GPL(tb_ring_alloc_rx);
|
|
|
|
/**
|
|
* tb_ring_start() - enable a ring
|
|
*
|
|
* 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;
|
|
}
|
|
|
|
if (ring->flags & RING_FLAG_E2E && !ring->is_tx) {
|
|
u32 hop;
|
|
|
|
/*
|
|
* In order not to lose Rx packets we enable end-to-end
|
|
* workaround which transfers Rx credits to an unused Tx
|
|
* HopID.
|
|
*/
|
|
hop = RING_E2E_UNUSED_HOPID << REG_RX_OPTIONS_E2E_HOP_SHIFT;
|
|
hop &= REG_RX_OPTIONS_E2E_HOP_MASK;
|
|
flags |= hop | RING_FLAG_E2E_FLOW_CONTROL;
|
|
}
|
|
|
|
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);
|
|
}
|
|
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
|
|
*
|
|
* 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_iowrite16desc(ring, 0, ring->is_tx ? 10 : 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)
|
|
{
|
|
struct pci_dev *pdev = to_pci_dev(dev);
|
|
struct tb *tb = pci_get_drvdata(pdev);
|
|
|
|
return tb_domain_suspend_noirq(tb);
|
|
}
|
|
|
|
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);
|
|
|
|
/*
|
|
* 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))
|
|
tb->nhi->going_away = true;
|
|
else
|
|
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);
|
|
|
|
return tb_domain_runtime_suspend(tb);
|
|
}
|
|
|
|
static int nhi_runtime_resume(struct device *dev)
|
|
{
|
|
struct pci_dev *pdev = to_pci_dev(dev);
|
|
struct tb *tb = pci_get_drvdata(pdev);
|
|
|
|
nhi_enable_int_throttling(tb->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);
|
|
}
|
|
|
|
static int nhi_init_msi(struct tb_nhi *nhi)
|
|
{
|
|
struct pci_dev *pdev = nhi->pdev;
|
|
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) {
|
|
dev_err(&pdev->dev, "request_irq failed, aborting\n");
|
|
return res;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nhi_probe(struct pci_dev *pdev, const struct pci_device_id *id)
|
|
{
|
|
struct tb_nhi *nhi;
|
|
struct tb *tb;
|
|
int res;
|
|
|
|
res = pcim_enable_device(pdev);
|
|
if (res) {
|
|
dev_err(&pdev->dev, "cannot enable PCI device, aborting\n");
|
|
return res;
|
|
}
|
|
|
|
res = pcim_iomap_regions(pdev, 1 << 0, "thunderbolt");
|
|
if (res) {
|
|
dev_err(&pdev->dev, "cannot obtain PCI resources, aborting\n");
|
|
return res;
|
|
}
|
|
|
|
nhi = devm_kzalloc(&pdev->dev, sizeof(*nhi), GFP_KERNEL);
|
|
if (!nhi)
|
|
return -ENOMEM;
|
|
|
|
nhi->pdev = pdev;
|
|
/* cannot fail - table is allocated bin pcim_iomap_regions */
|
|
nhi->iobase = pcim_iomap_table(pdev)[0];
|
|
nhi->hop_count = ioread32(nhi->iobase + REG_HOP_COUNT) & 0x3ff;
|
|
if (nhi->hop_count != 12 && nhi->hop_count != 32)
|
|
dev_warn(&pdev->dev, "unexpected hop count: %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;
|
|
|
|
res = nhi_init_msi(nhi);
|
|
if (res) {
|
|
dev_err(&pdev->dev, "cannot enable MSI, aborting\n");
|
|
return res;
|
|
}
|
|
|
|
spin_lock_init(&nhi->lock);
|
|
|
|
res = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
|
|
if (res)
|
|
res = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
|
|
if (res) {
|
|
dev_err(&pdev->dev, "failed to set DMA mask\n");
|
|
return res;
|
|
}
|
|
|
|
pci_set_master(pdev);
|
|
|
|
tb = icm_probe(nhi);
|
|
if (!tb)
|
|
tb = tb_probe(nhi);
|
|
if (!tb) {
|
|
dev_err(&nhi->pdev->dev,
|
|
"failed to determine connection manager, aborting\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
dev_dbg(&nhi->pdev->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);
|
|
|
|
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_suspend_noirq, /*
|
|
* we just disable hotplug, the
|
|
* pci-tunnels stay alive.
|
|
*/
|
|
.thaw_noirq = nhi_resume_noirq,
|
|
.restore_noirq = nhi_resume_noirq,
|
|
.suspend = nhi_suspend,
|
|
.freeze = nhi_suspend,
|
|
.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) },
|
|
|
|
{ 0,}
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(pci, nhi_ids);
|
|
MODULE_LICENSE("GPL");
|
|
|
|
static struct pci_driver nhi_driver = {
|
|
.name = "thunderbolt",
|
|
.id_table = nhi_ids,
|
|
.probe = nhi_probe,
|
|
.remove = 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);
|