In drivers/usb/host/xhci-ring.c there are two functions
(xhci_queue_bulk_tx and queue_bulk_sg_tx) that are very similar,
so a lot of code duplication.
This patch merges these functions into to one xhci_queue_bulk_tx.
Also counting the needed TRBs is merged and refactored.
Signed-off-by: Alexandr Ivanov <alexandr....@gmail.com>
---
drivers/usb/host/xhci-ring.c | 406 +++++++++++++------------------------------
drivers/usb/host/xhci.h | 3 +
2 files changed, 121 insertions(+), 288 deletions(-)
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index 7cf6621..2a1bb76 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -2938,46 +2938,55 @@ static int prepare_transfer(struct xhci_hcd *xhci,
return 0;
}
-static unsigned int count_sg_trbs_needed(struct xhci_hcd *xhci, struct urb
*urb)
+static unsigned int count_trbs(u64 addr, u64 len)
+{
+ unsigned int num_trbs;
+
+ num_trbs = DIV_ROUND_UP(len + (addr & (TRB_MAX_BUFF_SIZE - 1)),
+ TRB_MAX_BUFF_SIZE);
+ if (num_trbs == 0)
+ num_trbs++;
+
+ return num_trbs;
+}
+
+static inline unsigned int count_trbs_needed(struct urb *urb)
+{
+ return count_trbs(urb->transfer_dma, urb->transfer_buffer_length);
+}
+
+static unsigned int count_sg_trbs_needed(struct urb *urb)
{
- int num_sgs, num_trbs, running_total, temp, i;
struct scatterlist *sg;
+ unsigned int i, len, full_len, num_trbs = 0;
- sg = NULL;
- num_sgs = urb->num_mapped_sgs;
- temp = urb->transfer_buffer_length;
+ full_len = urb->transfer_buffer_length;
- num_trbs = 0;
- for_each_sg(urb->sg, sg, num_sgs, i) {
- unsigned int len = sg_dma_len(sg);
-
- /* Scatter gather list entries may cross 64KB boundaries */
- running_total = TRB_MAX_BUFF_SIZE -
- (sg_dma_address(sg) & (TRB_MAX_BUFF_SIZE - 1));
- running_total &= TRB_MAX_BUFF_SIZE - 1;
- if (running_total != 0)
- num_trbs++;
-
- /* How many more 64KB chunks to transfer, how many more TRBs? */
- while (running_total < sg_dma_len(sg) && running_total < temp) {
- num_trbs++;
- running_total += TRB_MAX_BUFF_SIZE;
- }
- len = min_t(int, len, temp);
- temp -= len;
- if (temp == 0)
+ for_each_sg(urb->sg, sg, urb->num_mapped_sgs, i) {
+ len = sg_dma_len(sg);
+ num_trbs += count_trbs(sg_dma_address(sg), len);
+ len = min_t(unsigned int, len, full_len);
+ full_len -= len;
+ if (full_len == 0)
break;
}
+
return num_trbs;
}
-static void check_trb_math(struct urb *urb, int num_trbs, int running_total)
+static unsigned int count_isoc_trbs_needed(struct urb *urb, int i)
+{
+ u64 addr, len;
+
+ addr = (u64) (urb->transfer_dma + urb->iso_frame_desc[i].offset);
+ len = urb->iso_frame_desc[i].length;
+
+ return count_trbs(addr, len);
+}
+
+static void check_trb_math(struct urb *urb, int running_total)
{
- if (num_trbs != 0)
- dev_err(&urb->dev->dev, "%s - ep %#x - Miscalculated number of "
- "TRBs, %d left\n", __func__,
- urb->ep->desc.bEndpointAddress, num_trbs);
- if (running_total != urb->transfer_buffer_length)
+ if (unlikely(running_total != urb->transfer_buffer_length))
dev_err(&urb->dev->dev, "%s - ep %#x - Miscalculated tx length,
"
"queued %#x (%d), asked for %#x (%d)\n",
__func__,
@@ -3086,44 +3095,47 @@ static u32 xhci_td_remainder(struct xhci_hcd *xhci, int
transferred,
return (total_packet_count - ((transferred + trb_buff_len) / maxp));
}
-
-static int queue_bulk_sg_tx(struct xhci_hcd *xhci, gfp_t mem_flags,
+/* This is very similar to what ehci-q.c qtd_fill() does */
+int xhci_queue_bulk_tx(struct xhci_hcd *xhci, gfp_t mem_flags,
struct urb *urb, int slot_id, unsigned int ep_index)
{
struct xhci_ring *ep_ring;
- unsigned int num_trbs;
struct urb_priv *urb_priv;
struct xhci_td *td;
- struct scatterlist *sg;
- int num_sgs;
- int trb_buff_len, this_sg_len, running_total, ret;
- unsigned int total_packet_count;
+ struct xhci_generic_trb *start_trb;
+ struct scatterlist *sg = NULL;
+ bool more_trbs_coming;
bool zero_length_needed;
- bool first_trb;
- int last_trb_num;
+ unsigned int num_trbs, last_trb_num, i;
+ unsigned int start_cycle, num_sgs = 0;
+ unsigned int running_total, block_len, trb_buff_len;
+ unsigned int full_len;
+ int ret;
+ u32 field, length_field, remainder;
u64 addr;
- bool more_trbs_coming;
-
- struct xhci_generic_trb *start_trb;
- int start_cycle;
ep_ring = xhci_urb_to_transfer_ring(xhci, urb);
if (!ep_ring)
return -EINVAL;
- num_trbs = count_sg_trbs_needed(xhci, urb);
- num_sgs = urb->num_mapped_sgs;
- total_packet_count = DIV_ROUND_UP(urb->transfer_buffer_length,
- usb_endpoint_maxp(&urb->ep->desc));
+ /* If we have scatter/gather list, we use it. */
+ if (urb->num_sgs) {
+ num_sgs = urb->num_mapped_sgs;
+ sg = urb->sg;
+ num_trbs = count_sg_trbs_needed(urb);
+ } else
+ num_trbs = count_trbs_needed(urb);
ret = prepare_transfer(xhci, xhci->devs[slot_id],
ep_index, urb->stream_id,
num_trbs, urb, 0, mem_flags);
- if (ret < 0)
+ if (unlikely(ret < 0))
return ret;
urb_priv = urb->hcpriv;
+ last_trb_num = num_trbs - 1;
+
/* Deal with URB_ZERO_PACKET - need one more td/trb */
zero_length_needed = urb->transfer_flags & URB_ZERO_PACKET &&
urb_priv->length == 2;
@@ -3133,7 +3145,7 @@ static int queue_bulk_sg_tx(struct xhci_hcd *xhci, gfp_t
mem_flags,
ret = prepare_transfer(xhci, xhci->devs[slot_id],
ep_index, urb->stream_id,
1, urb, 1, mem_flags);
- if (ret < 0)
+ if (unlikely(ret < 0))
return ret;
}
@@ -3147,228 +3159,58 @@ static int queue_bulk_sg_tx(struct xhci_hcd *xhci,
gfp_t mem_flags,
start_trb = &ep_ring->enqueue->generic;
start_cycle = ep_ring->cycle_state;
+ full_len = urb->transfer_buffer_length;
running_total = 0;
- /*
- * How much data is in the first TRB?
- *
- * There are three forces at work for TRB buffer pointers and lengths:
- * 1. We don't want to walk off the end of this sg-list entry buffer.
- * 2. The transfer length that the driver requested may be smaller than
- * the amount of memory allocated for this scatter-gather list.
- * 3. TRBs buffers can't cross 64KB boundaries.
- */
- sg = urb->sg;
- addr = (u64) sg_dma_address(sg);
- this_sg_len = sg_dma_len(sg);
- trb_buff_len = TRB_MAX_BUFF_SIZE - (addr & (TRB_MAX_BUFF_SIZE - 1));
- trb_buff_len = min_t(int, trb_buff_len, this_sg_len);
- if (trb_buff_len > urb->transfer_buffer_length)
- trb_buff_len = urb->transfer_buffer_length;
-
- first_trb = true;
- last_trb_num = zero_length_needed ? 2 : 1;
- /* Queue the first TRB, even if it's zero-length */
- do {
- u32 field = 0;
- u32 length_field = 0;
- u32 remainder = 0;
+ block_len = 0;
- /* Don't change the cycle bit of the first TRB until later */
- if (first_trb) {
- first_trb = false;
- if (start_cycle == 0)
- field |= 0x1;
- } else
- field |= ep_ring->cycle_state;
-
- /* Chain all the TRBs together; clear the chain bit in the last
- * TRB to indicate it's the last TRB in the chain.
- */
- if (num_trbs > last_trb_num) {
- field |= TRB_CHAIN;
- } else if (num_trbs == last_trb_num) {
- td->last_trb = ep_ring->enqueue;
- field |= TRB_IOC;
- } else if (zero_length_needed && num_trbs == 1) {
- trb_buff_len = 0;
- urb_priv->td[1]->last_trb = ep_ring->enqueue;
- field |= TRB_IOC;
- }
-
- /* Only set interrupt on short packet for IN endpoints */
- if (usb_urb_dir_in(urb))
- field |= TRB_ISP;
+ /* Queue the TRBs, even if they are zero-length */
+ for (i = 0; i < num_trbs; i++) {
+ field = TRB_TYPE(TRB_NORMAL);
- if (TRB_MAX_BUFF_SIZE -
- (addr & (TRB_MAX_BUFF_SIZE - 1)) <
trb_buff_len) {
- xhci_warn(xhci, "WARN: sg dma xfer crosses 64KB
boundaries!\n");
- xhci_dbg(xhci, "Next boundary at %#x, end dma = %#x\n",
- (unsigned int) (addr +
TRB_MAX_BUFF_SIZE) & ~(TRB_MAX_BUFF_SIZE - 1),
- (unsigned int) addr + trb_buff_len);
- }
-
- /* Set the TRB length, TD size, and interrupter fields. */
- remainder = xhci_td_remainder(xhci, running_total, trb_buff_len,
- urb->transfer_buffer_length,
- urb, num_trbs - 1);
-
- length_field = TRB_LEN(trb_buff_len) |
- TRB_TD_SIZE(remainder) |
- TRB_INTR_TARGET(0);
-
- if (num_trbs > 1)
- more_trbs_coming = true;
- else
- more_trbs_coming = false;
- queue_trb(xhci, ep_ring, more_trbs_coming,
- lower_32_bits(addr),
- upper_32_bits(addr),
- length_field,
- field | TRB_TYPE(TRB_NORMAL));
- --num_trbs;
- running_total += trb_buff_len;
-
- /* Calculate length for next transfer --
- * Are we done queueing all the TRBs for this sg entry?
- */
- this_sg_len -= trb_buff_len;
- if (this_sg_len == 0) {
- --num_sgs;
- if (num_sgs == 0)
- break;
- sg = sg_next(sg);
- addr = (u64) sg_dma_address(sg);
- this_sg_len = sg_dma_len(sg);
+ if (block_len == 0) {
+ /* A new contiguous block. */
+ if (sg) {
+ addr = (u64) sg_dma_address(sg);
+ block_len = sg_dma_len(sg);
+ } else {
+ addr = (u64) urb->transfer_dma;
+ block_len = full_len;
+ }
+ /* TRB buffer should not cross 64KB boundaries */
+ trb_buff_len = TRB_BUFF_LEN_UP_TO_BOUNDARY(addr);
+ trb_buff_len = min_t(unsigned int,
+ trb_buff_len,
+ block_len);
} else {
- addr += trb_buff_len;
+ /* Further through the contiguous block. */
+ trb_buff_len = block_len;
+ if (trb_buff_len > TRB_MAX_BUFF_SIZE)
+ trb_buff_len = TRB_MAX_BUFF_SIZE;
}
- trb_buff_len = TRB_MAX_BUFF_SIZE -
- (addr & (TRB_MAX_BUFF_SIZE - 1));
- trb_buff_len = min_t(int, trb_buff_len, this_sg_len);
- if (running_total + trb_buff_len > urb->transfer_buffer_length)
- trb_buff_len =
- urb->transfer_buffer_length - running_total;
- } while (num_trbs > 0);
-
- check_trb_math(urb, num_trbs, running_total);
- giveback_first_trb(xhci, slot_id, ep_index, urb->stream_id,
- start_cycle, start_trb);
- return 0;
-}
-
-/* This is very similar to what ehci-q.c qtd_fill() does */
-int xhci_queue_bulk_tx(struct xhci_hcd *xhci, gfp_t mem_flags,
- struct urb *urb, int slot_id, unsigned int ep_index)
-{
- struct xhci_ring *ep_ring;
- struct urb_priv *urb_priv;
- struct xhci_td *td;
- int num_trbs;
- struct xhci_generic_trb *start_trb;
- bool first_trb;
- int last_trb_num;
- bool more_trbs_coming;
- bool zero_length_needed;
- int start_cycle;
- u32 field, length_field;
-
- int running_total, trb_buff_len, ret;
- unsigned int total_packet_count;
- u64 addr;
-
- if (urb->num_sgs)
- return queue_bulk_sg_tx(xhci, mem_flags, urb, slot_id,
ep_index);
-
- ep_ring = xhci_urb_to_transfer_ring(xhci, urb);
- if (!ep_ring)
- return -EINVAL;
-
- num_trbs = 0;
- /* How much data is (potentially) left before the 64KB boundary? */
- running_total = TRB_MAX_BUFF_SIZE -
- (urb->transfer_dma & (TRB_MAX_BUFF_SIZE - 1));
- running_total &= TRB_MAX_BUFF_SIZE - 1;
-
- /* If there's some data on this 64KB chunk, or we have to send a
- * zero-length transfer, we need at least one TRB
- */
- if (running_total != 0 || urb->transfer_buffer_length == 0)
- num_trbs++;
- /* How many more 64KB chunks to transfer, how many more TRBs? */
- while (running_total < urb->transfer_buffer_length) {
- num_trbs++;
- running_total += TRB_MAX_BUFF_SIZE;
- }
-
- ret = prepare_transfer(xhci, xhci->devs[slot_id],
- ep_index, urb->stream_id,
- num_trbs, urb, 0, mem_flags);
- if (ret < 0)
- return ret;
-
- urb_priv = urb->hcpriv;
-
- /* Deal with URB_ZERO_PACKET - need one more td/trb */
- zero_length_needed = urb->transfer_flags & URB_ZERO_PACKET &&
- urb_priv->length == 2;
- if (zero_length_needed) {
- num_trbs++;
- xhci_dbg(xhci, "Creating zero length td.\n");
- ret = prepare_transfer(xhci, xhci->devs[slot_id],
- ep_index, urb->stream_id,
- 1, urb, 1, mem_flags);
- if (ret < 0)
- return ret;
- }
-
- td = urb_priv->td[0];
-
- /*
- * Don't give the first TRB to the hardware (by toggling the cycle bit)
- * until we've finished creating all the other TRBs. The ring's cycle
- * state may change as we enqueue the other TRBs, so save it too.
- */
- start_trb = &ep_ring->enqueue->generic;
- start_cycle = ep_ring->cycle_state;
-
- running_total = 0;
- total_packet_count = DIV_ROUND_UP(urb->transfer_buffer_length,
- usb_endpoint_maxp(&urb->ep->desc));
- /* How much data is in the first TRB? */
- addr = (u64) urb->transfer_dma;
- trb_buff_len = TRB_MAX_BUFF_SIZE -
- (urb->transfer_dma & (TRB_MAX_BUFF_SIZE - 1));
- if (trb_buff_len > urb->transfer_buffer_length)
- trb_buff_len = urb->transfer_buffer_length;
-
- first_trb = true;
- last_trb_num = zero_length_needed ? 2 : 1;
- /* Queue the first TRB, even if it's zero-length */
- do {
- u32 remainder = 0;
- field = 0;
+ if (running_total + trb_buff_len > full_len)
+ trb_buff_len = full_len - running_total;
/* Don't change the cycle bit of the first TRB until later */
- if (first_trb) {
- first_trb = false;
+ if (i == 0) {
if (start_cycle == 0)
- field |= 0x1;
+ field |= TRB_CYCLE;
} else
field |= ep_ring->cycle_state;
/* Chain all the TRBs together; clear the chain bit in the last
* TRB to indicate it's the last TRB in the chain.
*/
- if (num_trbs > last_trb_num) {
+ if (i < last_trb_num) {
field |= TRB_CHAIN;
- } else if (num_trbs == last_trb_num) {
- td->last_trb = ep_ring->enqueue;
- field |= TRB_IOC;
- } else if (zero_length_needed && num_trbs == 1) {
- trb_buff_len = 0;
- urb_priv->td[1]->last_trb = ep_ring->enqueue;
+ } else {
field |= TRB_IOC;
+ if (i == last_trb_num)
+ td->last_trb = ep_ring->enqueue;
+ else if (zero_length_needed) {
+ trb_buff_len = 0;
+ urb_priv->td[1]->last_trb = ep_ring->enqueue;
+ }
}
/* Only set interrupt on short packet for IN endpoints */
@@ -3376,15 +3218,15 @@ int xhci_queue_bulk_tx(struct xhci_hcd *xhci, gfp_t
mem_flags,
field |= TRB_ISP;
/* Set the TRB length, TD size, and interrupter fields. */
- remainder = xhci_td_remainder(xhci, running_total, trb_buff_len,
- urb->transfer_buffer_length,
- urb, num_trbs - 1);
+ remainder = xhci_td_remainder(xhci, running_total,
+ trb_buff_len, full_len,
+ urb, num_trbs - i - 1);
length_field = TRB_LEN(trb_buff_len) |
TRB_TD_SIZE(remainder) |
TRB_INTR_TARGET(0);
- if (num_trbs > 1)
+ if (i < num_trbs - 1)
more_trbs_coming = true;
else
more_trbs_coming = false;
@@ -3392,18 +3234,24 @@ int xhci_queue_bulk_tx(struct xhci_hcd *xhci, gfp_t
mem_flags,
lower_32_bits(addr),
upper_32_bits(addr),
length_field,
- field | TRB_TYPE(TRB_NORMAL));
- --num_trbs;
- running_total += trb_buff_len;
+ field);
- /* Calculate length for next transfer */
+ running_total += trb_buff_len;
addr += trb_buff_len;
- trb_buff_len = urb->transfer_buffer_length - running_total;
- if (trb_buff_len > TRB_MAX_BUFF_SIZE)
- trb_buff_len = TRB_MAX_BUFF_SIZE;
- } while (num_trbs > 0);
+ block_len -= trb_buff_len;
+
+ if (sg) {
+ if (block_len == 0) {
+ /* New sg entry */
+ --num_sgs;
+ if (num_sgs == 0)
+ break;
+ sg = sg_next(sg);
+ }
+ }
+ }
- check_trb_math(urb, num_trbs, running_total);
+ check_trb_math(urb, running_total);
giveback_first_trb(xhci, slot_id, ep_index, urb->stream_id,
start_cycle, start_trb);
return 0;
@@ -3532,23 +3380,6 @@ int xhci_queue_ctrl_tx(struct xhci_hcd *xhci, gfp_t
mem_flags,
return 0;
}
-static int count_isoc_trbs_needed(struct xhci_hcd *xhci,
- struct urb *urb, int i)
-{
- int num_trbs = 0;
- u64 addr, td_len;
-
- addr = (u64) (urb->transfer_dma + urb->iso_frame_desc[i].offset);
- td_len = urb->iso_frame_desc[i].length;
-
- num_trbs = DIV_ROUND_UP(td_len + (addr & (TRB_MAX_BUFF_SIZE - 1)),
- TRB_MAX_BUFF_SIZE);
- if (num_trbs == 0)
- num_trbs++;
-
- return num_trbs;
-}
-
/*
* The transfer burst count field of the isochronous TRB defines the number of
* bursts that are required to move all packets in this TD. Only SuperSpeed
@@ -3746,7 +3577,7 @@ static int xhci_queue_isoc_tx(struct xhci_hcd *xhci,
gfp_t mem_flags,
last_burst_pkt_count = xhci_get_last_burst_packet_count(xhci,
urb, total_pkt_count);
- trbs_per_td = count_isoc_trbs_needed(xhci, urb, i);
+ trbs_per_td = count_isoc_trbs_needed(urb, i);
ret = prepare_transfer(xhci, xhci->devs[slot_id], ep_index,
urb->stream_id, trbs_per_td, urb, i, mem_flags);
@@ -3807,8 +3638,7 @@ static int xhci_queue_isoc_tx(struct xhci_hcd *xhci,
gfp_t mem_flags,
field |= TRB_BEI;
}
/* Calculate TRB length */
- trb_buff_len = TRB_MAX_BUFF_SIZE -
- (addr & ((1 << TRB_MAX_BUFF_SHIFT) - 1));
+ trb_buff_len = TRB_BUFF_LEN_UP_TO_BOUNDARY(addr);
if (trb_buff_len > td_remain_len)
trb_buff_len = td_remain_len;
@@ -3912,7 +3742,7 @@ int xhci_queue_isoc_tx_prepare(struct xhci_hcd *xhci,
gfp_t mem_flags,
num_trbs = 0;
num_tds = urb->number_of_packets;
for (i = 0; i < num_tds; i++)
- num_trbs += count_isoc_trbs_needed(xhci, urb, i);
+ num_trbs += count_isoc_trbs_needed(urb, i);
/* Check the ring to guarantee there is enough room for the whole urb.
* Do not insert any td of the urb to the ring if the check failed.
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index e293e09..ce97e01 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1338,6 +1338,9 @@ union xhci_trb {
/* TRB buffer pointers can't cross 64KB boundaries */
#define TRB_MAX_BUFF_SHIFT 16
#define TRB_MAX_BUFF_SIZE (1 << TRB_MAX_BUFF_SHIFT)
+/* How much data is left before the 64KB boundary? */
+#define TRB_BUFF_LEN_UP_TO_BOUNDARY(addr) (TRB_MAX_BUFF_SIZE - \
+ (addr & (TRB_MAX_BUFF_SIZE - 1)))
struct xhci_segment {
union xhci_trb *trbs;
--
2.5.0
--
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