(ctx->bytes + (ep_index * CTX_SIZE(xhci->hcc_params)));
}
+
+/***************** Streams structures manipulation *************************/
+
+void xhci_free_stream_ctx(struct xhci_hcd *xhci,
+ unsigned int num_stream_ctxs,
+ struct xhci_stream_ctx *stream_ctx, dma_addr_t dma)
+{
+ struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller);
+
+ if (num_stream_ctxs > MEDIUM_STREAM_ARRAY_SIZE)
+ pci_free_consistent(pdev,
+ sizeof(struct xhci_stream_ctx)*num_stream_ctxs,
+ stream_ctx, dma);
+ else if (num_stream_ctxs <= SMALL_STREAM_ARRAY_SIZE)
+ return dma_pool_free(xhci->small_streams_pool,
+ stream_ctx, dma);
+ else
+ return dma_pool_free(xhci->medium_streams_pool,
+ stream_ctx, dma);
+}
+
+/*
+ * The stream context array for each endpoint with bulk streams enabled can
+ * vary in size, based on:
+ * - how many streams the endpoint supports,
+ * - the maximum primary stream array size the host controller supports,
+ * - and how many streams the device driver asks for.
+ *
+ * The stream context array must be a power of 2, and can be as small as
+ * 64 bytes or as large as 1MB.
+ */
+struct xhci_stream_ctx *xhci_alloc_stream_ctx(struct xhci_hcd *xhci,
+ unsigned int num_stream_ctxs, dma_addr_t *dma,
+ gfp_t mem_flags)
+{
+ struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller);
+
+ if (num_stream_ctxs > MEDIUM_STREAM_ARRAY_SIZE)
+ return pci_alloc_consistent(pdev,
+ sizeof(struct xhci_stream_ctx)*num_stream_ctxs,
+ dma);
+ else if (num_stream_ctxs <= SMALL_STREAM_ARRAY_SIZE)
+ return dma_pool_alloc(xhci->small_streams_pool,
+ mem_flags, dma);
+ else
+ return dma_pool_alloc(xhci->medium_streams_pool,
+ mem_flags, dma);
+}
+
+#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
+struct xhci_ring *dma_to_stream_ring(
+ struct xhci_stream_info *stream_info,
+ u64 address)
+{
+ return radix_tree_lookup(&stream_info->trb_address_map,
+ address >> SEGMENT_SHIFT);
+}
+#endif /* CONFIG_USB_XHCI_HCD_DEBUGGING */
+
+#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
+static int xhci_test_radix_tree(struct xhci_hcd *xhci,
+ unsigned int num_streams,
+ struct xhci_stream_info *stream_info)
+{
+ u32 cur_stream;
+ struct xhci_ring *cur_ring;
+ u64 addr;
+
+ for (cur_stream = 1; cur_stream < num_streams; cur_stream++) {
+ struct xhci_ring *mapped_ring;
+ int trb_size = sizeof(union xhci_trb);
+
+ cur_ring = stream_info->stream_rings[cur_stream];
+ for (addr = cur_ring->first_seg->dma;
+ addr < cur_ring->first_seg->dma + SEGMENT_SIZE;
+ addr += trb_size) {
+ mapped_ring = dma_to_stream_ring(stream_info, addr);
+ if (cur_ring != mapped_ring) {
+ xhci_warn(xhci, "WARN: DMA address 0x%08llx "
+ "didn't map to stream ID %u; "
+ "mapped to ring %p\n",
+ (unsigned long long) addr,
+ cur_stream,
+ mapped_ring);
+ return -EINVAL;
+ }
+ }
+ /* One TRB after the end of the ring segment shouldn't return a
+ * pointer to the current ring (although it may be a part of a
+ * different ring).
+ */
+ mapped_ring = dma_to_stream_ring(stream_info, addr);
+ if (mapped_ring != cur_ring) {
+ /* One TRB before should also fail */
+ addr = cur_ring->first_seg->dma - trb_size;
+ mapped_ring = dma_to_stream_ring(stream_info, addr);
+ }
+ if (mapped_ring == cur_ring) {
+ xhci_warn(xhci, "WARN: Bad DMA address 0x%08llx "
+ "mapped to valid stream ID %u; "
+ "mapped ring = %p\n",
+ (unsigned long long) addr,
+ cur_stream,
+ mapped_ring);
+ return -EINVAL;
+ }
+ }
+ return 0;
+}
+#endif /* CONFIG_USB_XHCI_HCD_DEBUGGING */
+
+/*
+ * Change an endpoint's internal structure so it supports stream IDs. The
+ * number of requested streams includes stream 0, which cannot be used by device
+ * drivers.
+ *
+ * The number of stream contexts in the stream context array may be bigger than
+ * the number of streams the driver wants to use. This is because the number of
+ * stream context array entries must be a power of two.
+ *
+ * We need a radix tree for mapping physical addresses of TRBs to which stream
+ * ID they belong to. We need to do this because the host controller won't tell
+ * us which stream ring the TRB came from. We could store the stream ID in an
+ * event data TRB, but that doesn't help us for the cancellation case, since the
+ * endpoint may stop before it reaches that event data TRB.
+ *
+ * The radix tree maps the upper portion of the TRB DMA address to a ring
+ * segment that has the same upper portion of DMA addresses. For example, say I
+ * have segments of size 1KB, that are always 64-byte aligned. A segment may
+ * start at 0x10c91000 and end at 0x10c913f0. If I use the upper 10 bits, the
+ * key to the stream ID is 0x43244. I can use the DMA address of the TRB to
+ * pass the radix tree a key to get the right stream ID:
+ *
+ * 0x10c90fff >> 10 = 0x43243
+ * 0x10c912c0 >> 10 = 0x43244
+ * 0x10c91400 >> 10 = 0x43245
+ *
+ * Obviously, only those TRBs with DMA addresses that are within the segment
+ * will make the radix tree return the stream ID for that ring.
+ *
+ * Caveats for the radix tree:
+ *
+ * The radix tree uses an unsigned long as a key pair. On 32-bit systems, an
+ * unsigned long will be 32-bits; on a 64-bit system an unsigned long will be
+ * 64-bits. Since we only request 32-bit DMA addresses, we can use that as the
+ * key on 32-bit or 64-bit systems (it would also be fine if we asked for 64-bit
+ * PCI DMA addresses on a 64-bit system). There might be a problem on 32-bit
+ * extended systems (where the DMA address can be bigger than 32-bits),
+ * if we allow the PCI dma mask to be bigger than 32-bits. So don't do that.
+ */
+struct xhci_stream_info *xhci_alloc_stream_info(struct xhci_hcd *xhci,
+ unsigned int num_stream_ctxs,
+ unsigned int num_streams, gfp_t mem_flags)
+{
+ struct xhci_stream_info *stream_info;
+ u32 cur_stream;
+ struct xhci_ring *cur_ring;
+ unsigned long key;
+ u64 addr;
+ int ret;
+
+ xhci_dbg(xhci, "Allocating %u streams and %u "
+ "stream context array entries.\n",
+ num_streams, num_stream_ctxs);
+ if (xhci->cmd_ring_reserved_trbs == MAX_RSVD_CMD_TRBS) {
+ xhci_dbg(xhci, "Command ring has no reserved TRBs available\n");
+ return NULL;
+ }
+ xhci->cmd_ring_reserved_trbs++;
+
+ stream_info = kzalloc(sizeof(struct xhci_stream_info), mem_flags);
+ if (!stream_info)
+ goto cleanup_trbs;
+
+ stream_info->num_streams = num_streams;
+ stream_info->num_stream_ctxs = num_stream_ctxs;
+
+ /* Initialize the array of virtual pointers to stream rings. */
+ stream_info->stream_rings = kzalloc(
+ sizeof(struct xhci_ring *)*num_streams,
+ mem_flags);
+ if (!stream_info->stream_rings)
+ goto cleanup_info;
+
+ /* Initialize the array of DMA addresses for stream rings for the HW. */
+ stream_info->stream_ctx_array = xhci_alloc_stream_ctx(xhci,
+ num_stream_ctxs, &stream_info->ctx_array_dma,
+ mem_flags);
+ if (!stream_info->stream_ctx_array)
+ goto cleanup_ctx;
+ memset(stream_info->stream_ctx_array, 0,
+ sizeof(struct xhci_stream_ctx)*num_stream_ctxs);
+
+ /* Allocate everything needed to free the stream rings later */
+ stream_info->free_streams_command =
+ xhci_alloc_command(xhci, true, true, mem_flags);
+ if (!stream_info->free_streams_command)
+ goto cleanup_ctx;
+
+ INIT_RADIX_TREE(&stream_info->trb_address_map, GFP_ATOMIC);
+
+ /* Allocate rings for all the streams that the driver will use,
+ * and add their segment DMA addresses to the radix tree.
+ * Stream 0 is reserved.
+ */
+ for (cur_stream = 1; cur_stream < num_streams; cur_stream++) {
+ stream_info->stream_rings[cur_stream] =
+ xhci_ring_alloc(xhci, 1, true, mem_flags);
+ cur_ring = stream_info->stream_rings[cur_stream];
+ if (!cur_ring)
+ goto cleanup_rings;
+ /* Set deq ptr, cycle bit, and stream context type */
+ addr = cur_ring->first_seg->dma |
+ SCT_FOR_CTX(SCT_PRI_TR) |
+ cur_ring->cycle_state;
+ stream_info->stream_ctx_array[cur_stream].stream_ring = addr;
+ xhci_dbg(xhci, "Setting stream %d ring ptr to 0x%08llx\n",
+ cur_stream, (unsigned long long) addr);
+
+ key = (unsigned long)
+ (cur_ring->first_seg->dma >> SEGMENT_SHIFT);
+ ret = radix_tree_insert(&stream_info->trb_address_map,
+ key, cur_ring);
+ if (ret) {
+ xhci_ring_free(xhci, cur_ring);
+ stream_info->stream_rings[cur_stream] = NULL;
+ goto cleanup_rings;
+ }
+ }
+ /* Leave the other unused stream ring pointers in the stream context
+ * array initialized to zero. This will cause the xHC to give us an
+ * error if the device asks for a stream ID we don't have setup (if it
+ * was any other way, the host controller would assume the ring is
+ * "empty" and wait forever for data to be queued to that stream ID).
+ */
+#if XHCI_DEBUG
+ /* Do a little test on the radix tree to make sure it returns the
+ * correct values.
+ */
+ if (xhci_test_radix_tree(xhci, num_streams, stream_info))
+ goto cleanup_rings;
+#endif
+
+ return stream_info;
+
+cleanup_rings:
+ for (cur_stream = 1; cur_stream < num_streams; cur_stream++) {
+ cur_ring = stream_info->stream_rings[cur_stream];
+ if (cur_ring) {
+ addr = cur_ring->first_seg->dma;
+ radix_tree_delete(&stream_info->trb_address_map,
+ addr >> SEGMENT_SHIFT);
+ xhci_ring_free(xhci, cur_ring);
+ stream_info->stream_rings[cur_stream] = NULL;
+ }
+ }
+ xhci_free_command(xhci, stream_info->free_streams_command);
+cleanup_ctx:
+ kfree(stream_info->stream_rings);
+cleanup_info:
+ kfree(stream_info);
+cleanup_trbs:
+ xhci->cmd_ring_reserved_trbs--;
+ return NULL;
+}
+/*
+ * Sets the MaxPStreams field and the Linear Stream Array field.
+ * Sets the dequeue pointer to the stream context array.
+ */
+void xhci_setup_streams_ep_input_ctx(struct xhci_hcd *xhci,
+ struct xhci_ep_ctx *ep_ctx,
+ struct xhci_stream_info *stream_info)
+{
+ u32 max_primary_streams;
+ /* MaxPStreams is the number of stream context array entries, not the
+ * number we're actually using. Must be in 2^(MaxPstreams + 1) format.
+ * fls(0) = 0, fls(0x1) = 1, fls(0x10) = 2, fls(0x100) = 3, etc.
+ */
+ max_primary_streams = fls(stream_info->num_stream_ctxs) - 2;
+ xhci_dbg(xhci, "Setting number of stream ctx array entries to %u\n",
+ 1 << (max_primary_streams + 1));
+ ep_ctx->ep_info &= ~EP_MAXPSTREAMS_MASK;
+ ep_ctx->ep_info |= EP_MAXPSTREAMS(max_primary_streams);
+ ep_ctx->ep_info |= EP_HAS_LSA;
+ ep_ctx->deq = stream_info->ctx_array_dma;
+}
+
+/*
+ * Sets the MaxPStreams field and the Linear Stream Array field to 0.
+ * Reinstalls the "normal" endpoint ring (at its previous dequeue mark,
+ * not at the beginning of the ring).
+ */
+void xhci_setup_no_streams_ep_input_ctx(struct xhci_hcd *xhci,
+ struct xhci_ep_ctx *ep_ctx,
+ struct xhci_virt_ep *ep)
+{
+ dma_addr_t addr;
+ ep_ctx->ep_info &= ~EP_MAXPSTREAMS_MASK;
+ ep_ctx->ep_info &= ~EP_HAS_LSA;
+ addr = xhci_trb_virt_to_dma(ep->ring->deq_seg, ep->ring->dequeue);
+ ep_ctx->deq = addr | ep->ring->cycle_state;
+}
+
+/* Frees all stream contexts associated with the endpoint,
+ *
+ * Caller should fix the endpoint context streams fields.
+ */
+void xhci_free_stream_info(struct xhci_hcd *xhci,
+ struct xhci_stream_info *stream_info)
+{
+ int cur_stream;
+ struct xhci_ring *cur_ring;
+ dma_addr_t addr;
+
+ if (!stream_info)
+ return;
+
+ for (cur_stream = 1; cur_stream < stream_info->num_streams;
+ cur_stream++) {
+ cur_ring = stream_info->stream_rings[cur_stream];
+ if (cur_ring) {
+ addr = cur_ring->first_seg->dma;
+ radix_tree_delete(&stream_info->trb_address_map,
+ addr >> SEGMENT_SHIFT);
+ xhci_ring_free(xhci, cur_ring);
+ stream_info->stream_rings[cur_stream] = NULL;
+ }
+ }
+ xhci_free_command(xhci, stream_info->free_streams_command);
+ xhci->cmd_ring_reserved_trbs--;
+ if (stream_info->stream_ctx_array)
+ xhci_free_stream_ctx(xhci,
+ stream_info->num_stream_ctxs,
+ stream_info->stream_ctx_array,
+ stream_info->ctx_array_dma);
+
+ if (stream_info)
+ kfree(stream_info->stream_rings);
+ kfree(stream_info);
+}
+
+
+/***************** Device context manipulation *************************/
+
static void xhci_init_endpoint_timer(struct xhci_hcd *xhci,
struct xhci_virt_ep *ep)
{
if (!dev)
return;
- for (i = 0; i < 31; ++i)
+ for (i = 0; i < 31; ++i) {
if (dev->eps[i].ring)
xhci_ring_free(xhci, dev->eps[i].ring);
+ if (dev->eps[i].stream_info)
+ xhci_free_stream_info(xhci,
+ dev->eps[i].stream_info);
+ }
if (dev->ring_cache) {
for (i = 0; i < dev->num_rings_cached; i++)
return max_packet * (max_burst + 1);
}
+/* Set up an endpoint with one ring segment. Do not allocate stream rings.
+ * Drivers will have to call usb_alloc_streams() to do that.
+ */
int xhci_endpoint_init(struct xhci_hcd *xhci,
struct xhci_virt_device *virt_dev,
struct usb_device *udev,
xhci->device_pool = NULL;
xhci_dbg(xhci, "Freed device context pool\n");
+ if (xhci->small_streams_pool)
+ dma_pool_destroy(xhci->small_streams_pool);
+ xhci->small_streams_pool = NULL;
+ xhci_dbg(xhci, "Freed small stream array pool\n");
+
+ if (xhci->medium_streams_pool)
+ dma_pool_destroy(xhci->medium_streams_pool);
+ xhci->medium_streams_pool = NULL;
+ xhci_dbg(xhci, "Freed medium stream array pool\n");
+
xhci_write_64(xhci, 0, &xhci->op_regs->dcbaa_ptr);
if (xhci->dcbaa)
pci_free_consistent(pdev, sizeof(*xhci->dcbaa),
if (!xhci->segment_pool || !xhci->device_pool)
goto fail;
+ /* Linear stream context arrays don't have any boundary restrictions,
+ * and only need to be 16-byte aligned.
+ */
+ xhci->small_streams_pool =
+ dma_pool_create("xHCI 256 byte stream ctx arrays",
+ dev, SMALL_STREAM_ARRAY_SIZE, 16, 0);
+ xhci->medium_streams_pool =
+ dma_pool_create("xHCI 1KB stream ctx arrays",
+ dev, MEDIUM_STREAM_ARRAY_SIZE, 16, 0);
+ /* Any stream context array bigger than MEDIUM_STREAM_ARRAY_SIZE
+ * will be allocated with pci_alloc_consistent()
+ */
+
+ if (!xhci->small_streams_pool || !xhci->medium_streams_pool)
+ goto fail;
+
/* Set up the command ring to have one segments for now. */
xhci->cmd_ring = xhci_ring_alloc(xhci, 1, true, flags);
if (!xhci->cmd_ring)
ep_state = ep->ep_state;
/* Don't ring the doorbell for this endpoint if there are pending
* cancellations because the we don't want to interrupt processing.
+ * We don't want to restart any stream rings if there's a set dequeue
+ * pointer command pending because the device can choose to start any
+ * stream once the endpoint is on the HW schedule.
+ * FIXME - check all the stream rings for pending cancellations.
*/
if (!(ep_state & EP_HALT_PENDING) && !(ep_state & SET_DEQ_PENDING)
&& !(ep_state & EP_HALTED)) {
* Configure endpoint commands can come from the USB core
* configuration or alt setting changes, or because the HW
* needed an extra configure endpoint command after a reset
- * endpoint command. In the latter case, the xHCI driver is
- * not waiting on the configure endpoint command.
+ * endpoint command or streams were being configured.
+ * If the command was for a halted endpoint, the xHCI driver
+ * is not waiting on the configure endpoint command.
*/
ctrl_ctx = xhci_get_input_control_ctx(xhci,
virt_dev->in_ctx);
*/
#include <linux/irq.h>
+#include <linux/log2.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/slab.h>
spin_lock_irqsave(&xhci->lock, flags);
if (xhci->xhc_state & XHCI_STATE_DYING)
goto dying;
- ret = xhci_queue_bulk_tx(xhci, GFP_ATOMIC, urb,
- slot_id, ep_index);
+ if (xhci->devs[slot_id]->eps[ep_index].ep_state &
+ EP_GETTING_STREAMS) {
+ xhci_warn(xhci, "WARN: Can't enqueue URB while bulk ep "
+ "is transitioning to using streams.\n");
+ ret = -EINVAL;
+ } else if (xhci->devs[slot_id]->eps[ep_index].ep_state &
+ EP_GETTING_NO_STREAMS) {
+ xhci_warn(xhci, "WARN: Can't enqueue URB while bulk ep "
+ "is transitioning to "
+ "not having streams.\n");
+ ret = -EINVAL;
+ } else {
+ ret = xhci_queue_bulk_tx(xhci, GFP_ATOMIC, urb,
+ slot_id, ep_index);
+ }
spin_unlock_irqrestore(&xhci->lock, flags);
} else if (usb_endpoint_xfer_int(&urb->ep->desc)) {
spin_lock_irqsave(&xhci->lock, flags);
xhci_warn(xhci, "FIXME allocate a new ring segment\n");
}
+static int xhci_check_streams_endpoint(struct xhci_hcd *xhci,
+ struct usb_device *udev, struct usb_host_endpoint *ep,
+ unsigned int slot_id)
+{
+ int ret;
+ unsigned int ep_index;
+ unsigned int ep_state;
+
+ if (!ep)
+ return -EINVAL;
+ ret = xhci_check_args(xhci_to_hcd(xhci), udev, ep, 1, __func__);
+ if (ret <= 0)
+ return -EINVAL;
+ if (!ep->ss_ep_comp) {
+ xhci_warn(xhci, "WARN: No SuperSpeed Endpoint Companion"
+ " descriptor for ep 0x%x\n",
+ ep->desc.bEndpointAddress);
+ return -EINVAL;
+ }
+ if (ep->ss_ep_comp->desc.bmAttributes == 0) {
+ xhci_warn(xhci, "WARN: SuperSpeed Endpoint Companion"
+ " descriptor for ep 0x%x does not support streams\n",
+ ep->desc.bEndpointAddress);
+ return -EINVAL;
+ }
+
+ ep_index = xhci_get_endpoint_index(&ep->desc);
+ ep_state = xhci->devs[slot_id]->eps[ep_index].ep_state;
+ if (ep_state & EP_HAS_STREAMS ||
+ ep_state & EP_GETTING_STREAMS) {
+ xhci_warn(xhci, "WARN: SuperSpeed bulk endpoint 0x%x "
+ "already has streams set up.\n",
+ ep->desc.bEndpointAddress);
+ xhci_warn(xhci, "Send email to xHCI maintainer and ask for "
+ "dynamic stream context array reallocation.\n");
+ return -EINVAL;
+ }
+ if (!list_empty(&xhci->devs[slot_id]->eps[ep_index].ring->td_list)) {
+ xhci_warn(xhci, "Cannot setup streams for SuperSpeed bulk "
+ "endpoint 0x%x; URBs are pending.\n",
+ ep->desc.bEndpointAddress);
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static void xhci_calculate_streams_entries(struct xhci_hcd *xhci,
+ unsigned int *num_streams, unsigned int *num_stream_ctxs)
+{
+ unsigned int max_streams;
+
+ /* The stream context array size must be a power of two */
+ *num_stream_ctxs = roundup_pow_of_two(*num_streams);
+ /*
+ * Find out how many primary stream array entries the host controller
+ * supports. Later we may use secondary stream arrays (similar to 2nd
+ * level page entries), but that's an optional feature for xHCI host
+ * controllers. xHCs must support at least 4 stream IDs.
+ */
+ max_streams = HCC_MAX_PSA(xhci->hcc_params);
+ if (*num_stream_ctxs > max_streams) {
+ xhci_dbg(xhci, "xHCI HW only supports %u stream ctx entries.\n",
+ max_streams);
+ *num_stream_ctxs = max_streams;
+ *num_streams = max_streams;
+ }
+}
+
+/* Returns an error code if one of the endpoint already has streams.
+ * This does not change any data structures, it only checks and gathers
+ * information.
+ */
+static int xhci_calculate_streams_and_bitmask(struct xhci_hcd *xhci,
+ struct usb_device *udev,
+ struct usb_host_endpoint **eps, unsigned int num_eps,
+ unsigned int *num_streams, u32 *changed_ep_bitmask)
+{
+ struct usb_host_ss_ep_comp *ss_ep_comp;
+ unsigned int max_streams;
+ unsigned int endpoint_flag;
+ int i;
+ int ret;
+
+ for (i = 0; i < num_eps; i++) {
+ ret = xhci_check_streams_endpoint(xhci, udev,
+ eps[i], udev->slot_id);
+ if (ret < 0)
+ return ret;
+
+ ss_ep_comp = eps[i]->ss_ep_comp;
+ max_streams = USB_SS_MAX_STREAMS(ss_ep_comp->desc.bmAttributes);
+ if (max_streams < (*num_streams - 1)) {
+ xhci_dbg(xhci, "Ep 0x%x only supports %u stream IDs.\n",
+ eps[i]->desc.bEndpointAddress,
+ max_streams);
+ *num_streams = max_streams+1;
+ }
+
+ endpoint_flag = xhci_get_endpoint_flag(&eps[i]->desc);
+ if (*changed_ep_bitmask & endpoint_flag)
+ return -EINVAL;
+ *changed_ep_bitmask |= endpoint_flag;
+ }
+ return 0;
+}
+
+static u32 xhci_calculate_no_streams_bitmask(struct xhci_hcd *xhci,
+ struct usb_device *udev,
+ struct usb_host_endpoint **eps, unsigned int num_eps)
+{
+ u32 changed_ep_bitmask = 0;
+ unsigned int slot_id;
+ unsigned int ep_index;
+ unsigned int ep_state;
+ int i;
+
+ slot_id = udev->slot_id;
+ if (!xhci->devs[slot_id])
+ return 0;
+
+ for (i = 0; i < num_eps; i++) {
+ ep_index = xhci_get_endpoint_index(&eps[i]->desc);
+ ep_state = xhci->devs[slot_id]->eps[ep_index].ep_state;
+ /* Are streams already being freed for the endpoint? */
+ if (ep_state & EP_GETTING_NO_STREAMS) {
+ xhci_warn(xhci, "WARN Can't disable streams for "
+ "endpoint 0x%x\n, "
+ "streams are being disabled already.",
+ eps[i]->desc.bEndpointAddress);
+ return 0;
+ }
+ /* Are there actually any streams to free? */
+ if (!(ep_state & EP_HAS_STREAMS) &&
+ !(ep_state & EP_GETTING_STREAMS)) {
+ xhci_warn(xhci, "WARN Can't disable streams for "
+ "endpoint 0x%x\n, "
+ "streams are already disabled!",
+ eps[i]->desc.bEndpointAddress);
+ xhci_warn(xhci, "WARN xhci_free_streams() called "
+ "with non-streams endpoint\n");
+ return 0;
+ }
+ changed_ep_bitmask |= xhci_get_endpoint_flag(&eps[i]->desc);
+ }
+ return changed_ep_bitmask;
+}
+
+/*
+ * The USB device drivers use this function (though the HCD interface in USB
+ * core) to prepare a set of bulk endpoints to use streams. Streams are used to
+ * coordinate mass storage command queueing across multiple endpoints (basically
+ * a stream ID == a task ID).
+ *
+ * Setting up streams involves allocating the same size stream context array
+ * for each endpoint and issuing a configure endpoint command for all endpoints.
+ *
+ * Don't allow the call to succeed if one endpoint only supports one stream
+ * (which means it doesn't support streams at all).
+ *
+ * Drivers may get less stream IDs than they asked for, if the host controller
+ * hardware or endpoints claim they can't support the number of requested
+ * stream IDs.
+ */
+int xhci_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev,
+ struct usb_host_endpoint **eps, unsigned int num_eps,
+ unsigned int num_streams, gfp_t mem_flags)
+{
+ int i, ret;
+ struct xhci_hcd *xhci;
+ struct xhci_virt_device *vdev;
+ struct xhci_command *config_cmd;
+ unsigned int ep_index;
+ unsigned int num_stream_ctxs;
+ unsigned long flags;
+ u32 changed_ep_bitmask = 0;
+
+ if (!eps)
+ return -EINVAL;
+
+ /* Add one to the number of streams requested to account for
+ * stream 0 that is reserved for xHCI usage.
+ */
+ num_streams += 1;
+ xhci = hcd_to_xhci(hcd);
+ xhci_dbg(xhci, "Driver wants %u stream IDs (including stream 0).\n",
+ num_streams);
+
+ config_cmd = xhci_alloc_command(xhci, true, true, mem_flags);
+ if (!config_cmd) {
+ xhci_dbg(xhci, "Could not allocate xHCI command structure.\n");
+ return -ENOMEM;
+ }
+
+ /* Check to make sure all endpoints are not already configured for
+ * streams. While we're at it, find the maximum number of streams that
+ * all the endpoints will support and check for duplicate endpoints.
+ */
+ spin_lock_irqsave(&xhci->lock, flags);
+ ret = xhci_calculate_streams_and_bitmask(xhci, udev, eps,
+ num_eps, &num_streams, &changed_ep_bitmask);
+ if (ret < 0) {
+ xhci_free_command(xhci, config_cmd);
+ spin_unlock_irqrestore(&xhci->lock, flags);
+ return ret;
+ }
+ if (num_streams <= 1) {
+ xhci_warn(xhci, "WARN: endpoints can't handle "
+ "more than one stream.\n");
+ xhci_free_command(xhci, config_cmd);
+ spin_unlock_irqrestore(&xhci->lock, flags);
+ return -EINVAL;
+ }
+ vdev = xhci->devs[udev->slot_id];
+ /* Mark each endpoint as being in transistion, so
+ * xhci_urb_enqueue() will reject all URBs.
+ */
+ for (i = 0; i < num_eps; i++) {
+ ep_index = xhci_get_endpoint_index(&eps[i]->desc);
+ vdev->eps[ep_index].ep_state |= EP_GETTING_STREAMS;
+ }
+ spin_unlock_irqrestore(&xhci->lock, flags);
+
+ /* Setup internal data structures and allocate HW data structures for
+ * streams (but don't install the HW structures in the input context
+ * until we're sure all memory allocation succeeded).
+ */
+ xhci_calculate_streams_entries(xhci, &num_streams, &num_stream_ctxs);
+ xhci_dbg(xhci, "Need %u stream ctx entries for %u stream IDs.\n",
+ num_stream_ctxs, num_streams);
+
+ for (i = 0; i < num_eps; i++) {
+ ep_index = xhci_get_endpoint_index(&eps[i]->desc);
+ vdev->eps[ep_index].stream_info = xhci_alloc_stream_info(xhci,
+ num_stream_ctxs,
+ num_streams, mem_flags);
+ if (!vdev->eps[ep_index].stream_info)
+ goto cleanup;
+ /* Set maxPstreams in endpoint context and update deq ptr to
+ * point to stream context array. FIXME
+ */
+ }
+
+ /* Set up the input context for a configure endpoint command. */
+ for (i = 0; i < num_eps; i++) {
+ struct xhci_ep_ctx *ep_ctx;
+
+ ep_index = xhci_get_endpoint_index(&eps[i]->desc);
+ ep_ctx = xhci_get_ep_ctx(xhci, config_cmd->in_ctx, ep_index);
+
+ xhci_endpoint_copy(xhci, config_cmd->in_ctx,
+ vdev->out_ctx, ep_index);
+ xhci_setup_streams_ep_input_ctx(xhci, ep_ctx,
+ vdev->eps[ep_index].stream_info);
+ }
+ /* Tell the HW to drop its old copy of the endpoint context info
+ * and add the updated copy from the input context.
+ */
+ xhci_setup_input_ctx_for_config_ep(xhci, config_cmd->in_ctx,
+ vdev->out_ctx, changed_ep_bitmask, changed_ep_bitmask);
+
+ /* Issue and wait for the configure endpoint command */
+ ret = xhci_configure_endpoint(xhci, udev, config_cmd,
+ false, false);
+
+ /* xHC rejected the configure endpoint command for some reason, so we
+ * leave the old ring intact and free our internal streams data
+ * structure.
+ */
+ if (ret < 0)
+ goto cleanup;
+
+ spin_lock_irqsave(&xhci->lock, flags);
+ for (i = 0; i < num_eps; i++) {
+ ep_index = xhci_get_endpoint_index(&eps[i]->desc);
+ vdev->eps[ep_index].ep_state &= ~EP_GETTING_STREAMS;
+ xhci_dbg(xhci, "Slot %u ep ctx %u now has streams.\n",
+ udev->slot_id, ep_index);
+ vdev->eps[ep_index].ep_state |= EP_HAS_STREAMS;
+ }
+ xhci_free_command(xhci, config_cmd);
+ spin_unlock_irqrestore(&xhci->lock, flags);
+
+ /* Subtract 1 for stream 0, which drivers can't use */
+ return num_streams - 1;
+
+cleanup:
+ /* If it didn't work, free the streams! */
+ for (i = 0; i < num_eps; i++) {
+ ep_index = xhci_get_endpoint_index(&eps[i]->desc);
+ xhci_free_stream_info(xhci, vdev->eps[ep_index].stream_info);
+ /* FIXME Unset maxPstreams in endpoint context and
+ * update deq ptr to point to normal string ring.
+ */
+ vdev->eps[ep_index].ep_state &= ~EP_GETTING_STREAMS;
+ vdev->eps[ep_index].ep_state &= ~EP_HAS_STREAMS;
+ xhci_endpoint_zero(xhci, vdev, eps[i]);
+ }
+ xhci_free_command(xhci, config_cmd);
+ return -ENOMEM;
+}
+
+/* Transition the endpoint from using streams to being a "normal" endpoint
+ * without streams.
+ *
+ * Modify the endpoint context state, submit a configure endpoint command,
+ * and free all endpoint rings for streams if that completes successfully.
+ */
+int xhci_free_streams(struct usb_hcd *hcd, struct usb_device *udev,
+ struct usb_host_endpoint **eps, unsigned int num_eps,
+ gfp_t mem_flags)
+{
+ int i, ret;
+ struct xhci_hcd *xhci;
+ struct xhci_virt_device *vdev;
+ struct xhci_command *command;
+ unsigned int ep_index;
+ unsigned long flags;
+ u32 changed_ep_bitmask;
+
+ xhci = hcd_to_xhci(hcd);
+ vdev = xhci->devs[udev->slot_id];
+
+ /* Set up a configure endpoint command to remove the streams rings */
+ spin_lock_irqsave(&xhci->lock, flags);
+ changed_ep_bitmask = xhci_calculate_no_streams_bitmask(xhci,
+ udev, eps, num_eps);
+ if (changed_ep_bitmask == 0) {
+ spin_unlock_irqrestore(&xhci->lock, flags);
+ return -EINVAL;
+ }
+
+ /* Use the xhci_command structure from the first endpoint. We may have
+ * allocated too many, but the driver may call xhci_free_streams() for
+ * each endpoint it grouped into one call to xhci_alloc_streams().
+ */
+ ep_index = xhci_get_endpoint_index(&eps[0]->desc);
+ command = vdev->eps[ep_index].stream_info->free_streams_command;
+ for (i = 0; i < num_eps; i++) {
+ struct xhci_ep_ctx *ep_ctx;
+
+ ep_index = xhci_get_endpoint_index(&eps[i]->desc);
+ ep_ctx = xhci_get_ep_ctx(xhci, command->in_ctx, ep_index);
+ xhci->devs[udev->slot_id]->eps[ep_index].ep_state |=
+ EP_GETTING_NO_STREAMS;
+
+ xhci_endpoint_copy(xhci, command->in_ctx,
+ vdev->out_ctx, ep_index);
+ xhci_setup_no_streams_ep_input_ctx(xhci, ep_ctx,
+ &vdev->eps[ep_index]);
+ }
+ xhci_setup_input_ctx_for_config_ep(xhci, command->in_ctx,
+ vdev->out_ctx, changed_ep_bitmask, changed_ep_bitmask);
+ spin_unlock_irqrestore(&xhci->lock, flags);
+
+ /* Issue and wait for the configure endpoint command,
+ * which must succeed.
+ */
+ ret = xhci_configure_endpoint(xhci, udev, command,
+ false, true);
+
+ /* xHC rejected the configure endpoint command for some reason, so we
+ * leave the streams rings intact.
+ */
+ if (ret < 0)
+ return ret;
+
+ spin_lock_irqsave(&xhci->lock, flags);
+ for (i = 0; i < num_eps; i++) {
+ ep_index = xhci_get_endpoint_index(&eps[i]->desc);
+ xhci_free_stream_info(xhci, vdev->eps[ep_index].stream_info);
+ /* FIXME Unset maxPstreams in endpoint context and
+ * update deq ptr to point to normal string ring.
+ */
+ vdev->eps[ep_index].ep_state &= ~EP_GETTING_NO_STREAMS;
+ vdev->eps[ep_index].ep_state &= ~EP_HAS_STREAMS;
+ }
+ spin_unlock_irqrestore(&xhci->lock, flags);
+
+ return 0;
+}
+
/*
* This submits a Reset Device Command, which will set the device state to 0,
* set the device address to 0, and disable all the endpoints except the default
/* true: no secondary Stream ID Support */
#define HCC_NSS(p) ((p) & (1 << 7))
/* Max size for Primary Stream Arrays - 2^(n+1), where n is bits 12:15 */
-#define HCC_MAX_PSA (1 << ((((p) >> 12) & 0xf) + 1))
+#define HCC_MAX_PSA(p) (1 << ((((p) >> 12) & 0xf) + 1))
/* Extended Capabilities pointer from PCI base - section 5.3.6 */
#define HCC_EXT_CAPS(p) XHCI_HCC_EXT_CAPS(p)
/* Interval - period between requests to an endpoint - 125u increments. */
#define EP_INTERVAL(p) ((p & 0xff) << 16)
#define EP_INTERVAL_TO_UFRAMES(p) (1 << (((p) >> 16) & 0xff))
+#define EP_MAXPSTREAMS_MASK (0x1f << 10)
+#define EP_MAXPSTREAMS(p) (((p) << 10) & EP_MAXPSTREAMS_MASK)
+/* Endpoint is set up with a Linear Stream Array (vs. Secondary Stream Array) */
+#define EP_HAS_LSA (1 << 15)
/* ep_info2 bitmasks */
/*
/* add context bitmasks */
#define ADD_EP(x) (0x1 << x)
+struct xhci_stream_ctx {
+ /* 64-bit stream ring address, cycle state, and stream type */
+ u64 stream_ring;
+ /* offset 0x14 - 0x1f reserved for HC internal use */
+ u32 reserved[2];
+};
+
+/* Stream Context Types (section 6.4.1) - bits 3:1 of stream ctx deq ptr */
+#define SCT_FOR_CTX(p) (((p) << 1) & 0x7)
+/* Secondary stream array type, dequeue pointer is to a transfer ring */
+#define SCT_SEC_TR 0
+/* Primary stream array type, dequeue pointer is to a transfer ring */
+#define SCT_PRI_TR 1
+/* Dequeue pointer is for a secondary stream array (SSA) with 8 entries */
+#define SCT_SSA_8 2
+#define SCT_SSA_16 3
+#define SCT_SSA_32 4
+#define SCT_SSA_64 5
+#define SCT_SSA_128 6
+#define SCT_SSA_256 7
+
+/* Assume no secondary streams for now */
+struct xhci_stream_info {
+ struct xhci_ring **stream_rings;
+ /* Number of streams, including stream 0 (which drivers can't use) */
+ unsigned int num_streams;
+ /* The stream context array may be bigger than
+ * the number of streams the driver asked for
+ */
+ struct xhci_stream_ctx *stream_ctx_array;
+ unsigned int num_stream_ctxs;
+ dma_addr_t ctx_array_dma;
+ /* For mapping physical TRB addresses to segments in stream rings */
+ struct radix_tree_root trb_address_map;
+ struct xhci_command *free_streams_command;
+};
+
+#define SMALL_STREAM_ARRAY_SIZE 256
+#define MEDIUM_STREAM_ARRAY_SIZE 1024
+
struct xhci_virt_ep {
struct xhci_ring *ring;
+ /* Related to endpoints that are configured to use stream IDs only */
+ struct xhci_stream_info *stream_info;
/* Temporary storage in case the configure endpoint command fails and we
* have to restore the device state to the previous state
*/
#define SET_DEQ_PENDING (1 << 0)
#define EP_HALTED (1 << 1) /* For stall handling */
#define EP_HALT_PENDING (1 << 2) /* For URB cancellation */
+/* Transitioning the endpoint to using streams, don't enqueue URBs */
+#define EP_GETTING_STREAMS (1 << 3)
+#define EP_HAS_STREAMS (1 << 4)
+/* Transitioning the endpoint to not using streams, don't enqueue URBs */
+#define EP_GETTING_NO_STREAMS (1 << 5)
/* ---- Related to URB cancellation ---- */
struct list_head cancelled_td_list;
/* The TRB that was last reported in a stopped endpoint ring */
*/
-struct xhci_stream_ctx {
- /* 64-bit stream ring address, cycle state, and stream type */
- u64 stream_ring;
- /* offset 0x14 - 0x1f reserved for HC internal use */
- u32 reserved[2];
-};
-
-
struct xhci_transfer_event {
/* 64-bit buffer address, or immediate data */
u64 buffer;
/* Allow two commands + a link TRB, along with any reserved command TRBs */
#define MAX_RSVD_CMD_TRBS (TRBS_PER_SEGMENT - 3)
#define SEGMENT_SIZE (TRBS_PER_SEGMENT*16)
+/* SEGMENT_SHIFT should be log2(SEGMENT_SIZE).
+ * Change this if you change TRBS_PER_SEGMENT!
+ */
+#define SEGMENT_SHIFT 10
/* TRB buffer pointers can't cross 64KB boundaries */
#define TRB_MAX_BUFF_SHIFT 16
#define TRB_MAX_BUFF_SIZE (1 << TRB_MAX_BUFF_SHIFT)
/* DMA pools */
struct dma_pool *device_pool;
struct dma_pool *segment_pool;
+ struct dma_pool *small_streams_pool;
+ struct dma_pool *medium_streams_pool;
#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
/* Poll the rings - for debugging */
void xhci_free_or_cache_endpoint_ring(struct xhci_hcd *xhci,
struct xhci_virt_device *virt_dev,
unsigned int ep_index);
+struct xhci_stream_info *xhci_alloc_stream_info(struct xhci_hcd *xhci,
+ unsigned int num_stream_ctxs,
+ unsigned int num_streams, gfp_t flags);
+void xhci_free_stream_info(struct xhci_hcd *xhci,
+ struct xhci_stream_info *stream_info);
+void xhci_setup_streams_ep_input_ctx(struct xhci_hcd *xhci,
+ struct xhci_ep_ctx *ep_ctx,
+ struct xhci_stream_info *stream_info);
+void xhci_setup_no_streams_ep_input_ctx(struct xhci_hcd *xhci,
+ struct xhci_ep_ctx *ep_ctx,
+ struct xhci_virt_ep *ep);
struct xhci_command *xhci_alloc_command(struct xhci_hcd *xhci,
bool allocate_in_ctx, bool allocate_completion,
gfp_t mem_flags);
irqreturn_t xhci_irq(struct usb_hcd *hcd);
int xhci_alloc_dev(struct usb_hcd *hcd, struct usb_device *udev);
void xhci_free_dev(struct usb_hcd *hcd, struct usb_device *udev);
+int xhci_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev,
+ struct usb_host_endpoint **eps, unsigned int num_eps,
+ unsigned int num_streams, gfp_t mem_flags);
+int xhci_free_streams(struct usb_hcd *hcd, struct usb_device *udev,
+ struct usb_host_endpoint **eps, unsigned int num_eps,
+ gfp_t mem_flags);
int xhci_address_device(struct usb_hcd *hcd, struct usb_device *udev);
int xhci_update_hub_device(struct usb_hcd *hcd, struct usb_device *hdev,
struct usb_tt *tt, gfp_t mem_flags);
projects / users / hch / configfs.git / commitdiff