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authorMika Westerberg <mika.westerberg@linux.intel.com>2020-10-19 19:15:20 +0300
committerMika Westerberg <mika.westerberg@linux.intel.com>2020-11-11 10:20:16 +0300
commitafe704a2d0618ebdb559b5ddb059f6cdbfc78783 (patch)
tree886cdf8b13452596fbb6b900071652a95f517ed2 /drivers/thunderbolt
parent5bf722df5d37e82fd252b1d3e37cde4eab355c1c (diff)
downloadlinux-afe704a2d0618ebdb559b5ddb059f6cdbfc78783.tar.xz
thunderbolt: Add support for end-to-end flow control
USB4 spec defines end-to-end (E2E) flow control that can be used between hosts to prevent overflow of a RX ring. We previously had this partially implemented but that code was removed with commit 53f13319d131 ("thunderbolt: Get rid of E2E workaround") with the idea that we add it back properly if there ever is need. Now that we are going to add DMA traffic test driver (in subsequent patches) this can be useful. For this reason we modify tb_ring_alloc_rx/tx() so that they accept RING_FLAG_E2E and configure the hardware ring accordingly. The RX side also requires passing TX HopID (e2e_tx_hop) used in the credit grant packets. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Acked-by: Yehezkel Bernat <YehezkelShB@gmail.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/thunderbolt')
-rw-r--r--drivers/thunderbolt/ctl.c4
-rw-r--r--drivers/thunderbolt/nhi.c36
2 files changed, 34 insertions, 6 deletions
diff --git a/drivers/thunderbolt/ctl.c b/drivers/thunderbolt/ctl.c
index 9894b8f63064..1d86e27a0ef3 100644
--- a/drivers/thunderbolt/ctl.c
+++ b/drivers/thunderbolt/ctl.c
@@ -628,8 +628,8 @@ struct tb_ctl *tb_ctl_alloc(struct tb_nhi *nhi, event_cb cb, void *cb_data)
if (!ctl->tx)
goto err;
- ctl->rx = tb_ring_alloc_rx(nhi, 0, 10, RING_FLAG_NO_SUSPEND, 0xffff,
- 0xffff, NULL, NULL);
+ ctl->rx = tb_ring_alloc_rx(nhi, 0, 10, RING_FLAG_NO_SUSPEND, 0, 0xffff,
+ 0xffff, NULL, NULL);
if (!ctl->rx)
goto err;
diff --git a/drivers/thunderbolt/nhi.c b/drivers/thunderbolt/nhi.c
index 3f79baa54829..a69bc6b49405 100644
--- a/drivers/thunderbolt/nhi.c
+++ b/drivers/thunderbolt/nhi.c
@@ -483,7 +483,7 @@ err_unlock:
static struct tb_ring *tb_ring_alloc(struct tb_nhi *nhi, u32 hop, int size,
bool transmit, unsigned int flags,
- u16 sof_mask, u16 eof_mask,
+ int e2e_tx_hop, u16 sof_mask, u16 eof_mask,
void (*start_poll)(void *),
void *poll_data)
{
@@ -506,6 +506,7 @@ static struct tb_ring *tb_ring_alloc(struct tb_nhi *nhi, u32 hop, int size,
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;
@@ -550,7 +551,7 @@ err_free_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);
+ return tb_ring_alloc(nhi, hop, size, true, flags, 0, 0, 0, NULL, NULL);
}
EXPORT_SYMBOL_GPL(tb_ring_alloc_tx);
@@ -560,6 +561,7 @@ EXPORT_SYMBOL_GPL(tb_ring_alloc_tx);
* @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
@@ -568,10 +570,11 @@ EXPORT_SYMBOL_GPL(tb_ring_alloc_tx);
* @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,
+ 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, sof_mask, eof_mask,
+ 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);
@@ -618,6 +621,31 @@ void tb_ring_start(struct tb_ring *ring)
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: