// SPDX-License-Identifier: GPL-2.0 /* * xHCI host controller driver * * Copyright (C) 2008 Intel Corp. * * Author: Sarah Sharp * Some code borrowed from the Linux EHCI driver. */ #include #include #include #include #include #include #include "xhci.h" #include "xhci-trace.h" #include "xhci-debugfs.h" /* * Allocates a generic ring segment from the ring pool, sets the dma address, * initializes the segment to zero, and sets the private next pointer to NULL. * * Section 4.11.1.1: * "All components of all Command and Transfer TRBs shall be initialized to '0'" */ static struct xhci_segment *xhci_segment_alloc(struct xhci_hcd *xhci, unsigned int cycle_state, unsigned int max_packet, unsigned int num, gfp_t flags) { struct xhci_segment *seg; dma_addr_t dma; int i; struct device *dev = xhci_to_hcd(xhci)->self.sysdev; seg = kzalloc_node(sizeof(*seg), flags, dev_to_node(dev)); if (!seg) return NULL; seg->trbs = dma_pool_zalloc(xhci->segment_pool, flags, &dma); if (!seg->trbs) { kfree(seg); return NULL; } if (max_packet) { seg->bounce_buf = kzalloc_node(max_packet, flags, dev_to_node(dev)); if (!seg->bounce_buf) { dma_pool_free(xhci->segment_pool, seg->trbs, dma); kfree(seg); return NULL; } } /* If the cycle state is 0, set the cycle bit to 1 for all the TRBs */ if (cycle_state == 0) { for (i = 0; i < TRBS_PER_SEGMENT; i++) seg->trbs[i].link.control = cpu_to_le32(TRB_CYCLE); } seg->num = num; seg->dma = dma; seg->next = NULL; return seg; } static void xhci_segment_free(struct xhci_hcd *xhci, struct xhci_segment *seg) { if (seg->trbs) { dma_pool_free(xhci->segment_pool, seg->trbs, seg->dma); seg->trbs = NULL; } kfree(seg->bounce_buf); kfree(seg); } static void xhci_free_segments_for_ring(struct xhci_hcd *xhci, struct xhci_segment *first) { struct xhci_segment *seg; seg = first->next; while (seg != first) { struct xhci_segment *next = seg->next; xhci_segment_free(xhci, seg); seg = next; } xhci_segment_free(xhci, first); } /* * Make the prev segment point to the next segment. * * Change the last TRB in the prev segment to be a Link TRB which points to the * DMA address of the next segment. The caller needs to set any Link TRB * related flags, such as End TRB, Toggle Cycle, and no snoop. */ static void xhci_link_segments(struct xhci_segment *prev, struct xhci_segment *next, enum xhci_ring_type type, bool chain_links) { u32 val; if (!prev || !next) return; prev->next = next; if (type != TYPE_EVENT) { prev->trbs[TRBS_PER_SEGMENT-1].link.segment_ptr = cpu_to_le64(next->dma); /* Set the last TRB in the segment to have a TRB type ID of Link TRB */ val = le32_to_cpu(prev->trbs[TRBS_PER_SEGMENT-1].link.control); val &= ~TRB_TYPE_BITMASK; val |= TRB_TYPE(TRB_LINK); if (chain_links) val |= TRB_CHAIN; prev->trbs[TRBS_PER_SEGMENT-1].link.control = cpu_to_le32(val); } } /* * Link the ring to the new segments. * Set Toggle Cycle for the new ring if needed. */ static void xhci_link_rings(struct xhci_hcd *xhci, struct xhci_ring *ring, struct xhci_segment *first, struct xhci_segment *last, unsigned int num_segs) { struct xhci_segment *next, *seg; bool chain_links; if (!ring || !first || !last) return; /* Set chain bit for 0.95 hosts, and for isoc rings on AMD 0.96 host */ chain_links = !!(xhci_link_trb_quirk(xhci) || (ring->type == TYPE_ISOC && (xhci->quirks & XHCI_AMD_0x96_HOST))); next = ring->enq_seg->next; xhci_link_segments(ring->enq_seg, first, ring->type, chain_links); xhci_link_segments(last, next, ring->type, chain_links); ring->num_segs += num_segs; if (ring->enq_seg == ring->last_seg) { if (ring->type != TYPE_EVENT) { ring->last_seg->trbs[TRBS_PER_SEGMENT-1].link.control &= ~cpu_to_le32(LINK_TOGGLE); last->trbs[TRBS_PER_SEGMENT-1].link.control |= cpu_to_le32(LINK_TOGGLE); } ring->last_seg = last; } for (seg = last; seg != ring->last_seg; seg = seg->next) seg->next->num = seg->num + 1; } /* * 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 1KB 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. */ static int xhci_insert_segment_mapping(struct radix_tree_root *trb_address_map, struct xhci_ring *ring, struct xhci_segment *seg, gfp_t mem_flags) { unsigned long key; int ret; key = (unsigned long)(seg->dma >> TRB_SEGMENT_SHIFT); /* Skip any segments that were already added. */ if (radix_tree_lookup(trb_address_map, key)) return 0; ret = radix_tree_maybe_preload(mem_flags); if (ret) return ret; ret = radix_tree_insert(trb_address_map, key, ring); radix_tree_preload_end(); return ret; } static void xhci_remove_segment_mapping(struct radix_tree_root *trb_address_map, struct xhci_segment *seg) { unsigned long key; key = (unsigned long)(seg->dma >> TRB_SEGMENT_SHIFT); if (radix_tree_lookup(trb_address_map, key)) radix_tree_delete(trb_address_map, key); } static int xhci_update_stream_segment_mapping( struct radix_tree_root *trb_address_map, struct xhci_ring *ring, struct xhci_segment *first_seg, struct xhci_segment *last_seg, gfp_t mem_flags) { struct xhci_segment *seg; struct xhci_segment *failed_seg; int ret; if (WARN_ON_ONCE(trb_address_map == NULL)) return 0; seg = first_seg; do { ret = xhci_insert_segment_mapping(trb_address_map, ring, seg, mem_flags); if (ret) goto remove_streams; if (seg == last_seg) return 0; seg = seg->next; } while (seg != first_seg); return 0; remove_streams: failed_seg = seg; seg = first_seg; do { xhci_remove_segment_mapping(trb_address_map, seg); if (seg == failed_seg) return ret; seg = seg->next; } while (seg != first_seg); return ret; } static void xhci_remove_stream_mapping(struct xhci_ring *ring) { struct xhci_segment *seg; if (WARN_ON_ONCE(ring->trb_address_map == NULL)) return; seg = ring->first_seg; do { xhci_remove_segment_mapping(ring->trb_address_map, seg); seg = seg->next; } while (seg != ring->first_seg); } static int xhci_update_stream_mapping(struct xhci_ring *ring, gfp_t mem_flags) { return xhci_update_stream_segment_mapping(ring->trb_address_map, ring, ring->first_seg, ring->last_seg, mem_flags); } /* XXX: Do we need the hcd structure in all these functions? */ void xhci_ring_free(struct xhci_hcd *xhci, struct xhci_ring *ring) { if (!ring) return; trace_xhci_ring_free(ring); if (ring->first_seg) { if (ring->type == TYPE_STREAM) xhci_remove_stream_mapping(ring); xhci_free_segments_for_ring(xhci, ring->first_seg); } kfree(ring); } void xhci_initialize_ring_info(struct xhci_ring *ring, unsigned int cycle_state) { /* The ring is empty, so the enqueue pointer == dequeue pointer */ ring->enqueue = ring->first_seg->trbs; ring->enq_seg = ring->first_seg; ring->dequeue = ring->enqueue; ring->deq_seg = ring->first_seg; /* The ring is initialized to 0. The producer must write 1 to the cycle * bit to handover ownership of the TRB, so PCS = 1. The consumer must * compare CCS to the cycle bit to check ownership, so CCS = 1. * * New rings are initialized with cycle state equal to 1; if we are * handling ring expansion, set the cycle state equal to the old ring. */ ring->cycle_state = cycle_state; /* * Each segment has a link TRB, and leave an extra TRB for SW * accounting purpose */ ring->num_trbs_free = ring->num_segs * (TRBS_PER_SEGMENT - 1) - 1; } /* Allocate segments and link them for a ring */ static int xhci_alloc_segments_for_ring(struct xhci_hcd *xhci, struct xhci_segment **first, struct xhci_segment **last, unsigned int num_segs, unsigned int num, unsigned int cycle_state, enum xhci_ring_type type, unsigned int max_packet, gfp_t flags) { struct xhci_segment *prev; bool chain_links; /* Set chain bit for 0.95 hosts, and for isoc rings on AMD 0.96 host */ chain_links = !!(xhci_link_trb_quirk(xhci) || (type == TYPE_ISOC && (xhci->quirks & XHCI_AMD_0x96_HOST))); prev = xhci_segment_alloc(xhci, cycle_state, max_packet, num, flags); if (!prev) return -ENOMEM; num++; *first = prev; while (num < num_segs) { struct xhci_segment *next; next = xhci_segment_alloc(xhci, cycle_state, max_packet, num, flags); if (!next) { prev = *first; while (prev) { next = prev->next; xhci_segment_free(xhci, prev); prev = next; } return -ENOMEM; } xhci_link_segments(prev, next, type, chain_links); prev = next; num++; } xhci_link_segments(prev, *first, type, chain_links); *last = prev; return 0; } /* * Create a new ring with zero or more segments. * * Link each segment together into a ring. * Set the end flag and the cycle toggle bit on the last segment. * See section 4.9.1 and figures 15 and 16. */ struct xhci_ring *xhci_ring_alloc(struct xhci_hcd *xhci, unsigned int num_segs, unsigned int cycle_state, enum xhci_ring_type type, unsigned int max_packet, gfp_t flags) { struct xhci_ring *ring; int ret; struct device *dev = xhci_to_hcd(xhci)->self.sysdev; ring = kzalloc_node(sizeof(*ring), flags, dev_to_node(dev)); if (!ring) return NULL; ring->num_segs = num_segs; ring->bounce_buf_len = max_packet; INIT_LIST_HEAD(&ring->td_list); ring->type = type; if (num_segs == 0) return ring; ret = xhci_alloc_segments_for_ring(xhci, &ring->first_seg, &ring->last_seg, num_segs, 0, cycle_state, type, max_packet, flags); if (ret) goto fail; /* Only event ring does not use link TRB */ if (type != TYPE_EVENT) { /* See section 4.9.2.1 and 6.4.4.1 */ ring->last_seg->trbs[TRBS_PER_SEGMENT - 1].link.control |= cpu_to_le32(LINK_TOGGLE); } xhci_initialize_ring_info(ring, cycle_state); trace_xhci_ring_alloc(ring); return ring; fail: kfree(ring); return NULL; } void xhci_free_endpoint_ring(struct xhci_hcd *xhci, struct xhci_virt_device *virt_dev, unsigned int ep_index) { xhci_ring_free(xhci, virt_dev->eps[ep_index].ring); virt_dev->eps[ep_index].ring = NULL; } /* * Expand an existing ring. * Allocate a new ring which has same segment numbers and link the two rings. */ int xhci_ring_expansion(struct xhci_hcd *xhci, struct xhci_ring *ring, unsigned int num_new_segs, gfp_t flags) { struct xhci_segment *first; struct xhci_segment *last; int ret; ret = xhci_alloc_segments_for_ring(xhci, &first, &last, num_new_segs, ring->enq_seg->num + 1, ring->cycle_state, ring->type, ring->bounce_buf_len, flags); if (ret) return -ENOMEM; if (ring->type == TYPE_STREAM) ret = xhci_update_stream_segment_mapping(ring->trb_address_map, ring, first, last, flags); if (ret) { struct xhci_segment *next; do { next = first->next; xhci_segment_free(xhci, first); if (first == last) break; first = next; } while (true); return ret; } xhci_link_rings(xhci, ring, first, last, num_new_segs); trace_xhci_ring_expansion(ring); xhci_dbg_trace(xhci, trace_xhci_dbg_ring_expansion, "ring expansion succeed, now has %d segments", ring->num_segs); return 0; } struct xhci_container_ctx *xhci_alloc_container_ctx(struct xhci_hcd *xhci, int type, gfp_t flags) { struct xhci_container_ctx *ctx; struct device *dev = xhci_to_hcd(xhci)->self.sysdev; if ((type != XHCI_CTX_TYPE_DEVICE) && (type != XHCI_CTX_TYPE_INPUT)) return NULL; ctx = kzalloc_node(sizeof(*ctx), flags, dev_to_node(dev)); if (!ctx) return NULL; ctx->type = type; ctx->size = HCC_64BYTE_CONTEXT(xhci->hcc_params) ? 2048 : 1024; if (type == XHCI_CTX_TYPE_INPUT) ctx->size += CTX_SIZE(xhci->hcc_params); ctx->bytes = dma_pool_zalloc(xhci->device_pool, flags, &ctx->dma); if (!ctx->bytes) { kfree(ctx); return NULL; } return ctx; } void xhci_free_container_ctx(struct xhci_hcd *xhci, struct xhci_container_ctx *ctx) { if (!ctx) return; dma_pool_free(xhci->device_pool, ctx->bytes, ctx->dma); kfree(ctx); } struct xhci_input_control_ctx *xhci_get_input_control_ctx( struct xhci_container_ctx *ctx) { if (ctx->type != XHCI_CTX_TYPE_INPUT) return NULL; return (struct xhci_input_control_ctx *)ctx->bytes; } struct xhci_slot_ctx *xhci_get_slot_ctx(struct xhci_hcd *xhci, struct xhci_container_ctx *ctx) { if (ctx->type == XHCI_CTX_TYPE_DEVICE) return (struct xhci_slot_ctx *)ctx->bytes; return (struct xhci_slot_ctx *) (ctx->bytes + CTX_SIZE(xhci->hcc_params)); } struct xhci_ep_ctx *xhci_get_ep_ctx(struct xhci_hcd *xhci, struct xhci_container_ctx *ctx, unsigned int ep_index) { /* increment ep index by offset of start of ep ctx array */ ep_index++; if (ctx->type == XHCI_CTX_TYPE_INPUT) ep_index++; return (struct xhci_ep_ctx *) (ctx->bytes + (ep_index * CTX_SIZE(xhci->hcc_params))); } EXPORT_SYMBOL_GPL(xhci_get_ep_ctx); /***************** Streams structures manipulation *************************/ static 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 device *dev = xhci_to_hcd(xhci)->self.sysdev; size_t size = sizeof(struct xhci_stream_ctx) * num_stream_ctxs; if (size > MEDIUM_STREAM_ARRAY_SIZE) dma_free_coherent(dev, size, stream_ctx, dma); else if (size > SMALL_STREAM_ARRAY_SIZE) dma_pool_free(xhci->medium_streams_pool, stream_ctx, dma); else dma_pool_free(xhci->small_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. */ static 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 device *dev = xhci_to_hcd(xhci)->self.sysdev; size_t size = size_mul(sizeof(struct xhci_stream_ctx), num_stream_ctxs); if (size > MEDIUM_STREAM_ARRAY_SIZE) return dma_alloc_coherent(dev, size, dma, mem_flags); if (size > SMALL_STREAM_ARRAY_SIZE) return dma_pool_zalloc(xhci->medium_streams_pool, mem_flags, dma); else return dma_pool_zalloc(xhci->small_streams_pool, mem_flags, dma); } struct xhci_ring *xhci_dma_to_transfer_ring( struct xhci_virt_ep *ep, u64 address) { if (ep->ep_state & EP_HAS_STREAMS) return radix_tree_lookup(&ep->stream_info->trb_address_map, address >> TRB_SEGMENT_SHIFT); return ep->ring; } /* * 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. */ struct xhci_stream_info *xhci_alloc_stream_info(struct xhci_hcd *xhci, unsigned int num_stream_ctxs, unsigned int num_streams, unsigned int max_packet, gfp_t mem_flags) { struct xhci_stream_info *stream_info; u32 cur_stream; struct xhci_ring *cur_ring; u64 addr; int ret; struct device *dev = xhci_to_hcd(xhci)->self.sysdev; 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_node(sizeof(*stream_info), mem_flags, dev_to_node(dev)); 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 = kcalloc_node( num_streams, sizeof(struct xhci_ring *), mem_flags, dev_to_node(dev)); 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_ring_array; /* Allocate everything needed to free the stream rings later */ stream_info->free_streams_command = xhci_alloc_command_with_ctx(xhci, 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, 2, 1, TYPE_STREAM, max_packet, mem_flags); cur_ring = stream_info->stream_rings[cur_stream]; if (!cur_ring) goto cleanup_rings; cur_ring->stream_id = cur_stream; cur_ring->trb_address_map = &stream_info->trb_address_map; /* 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 = cpu_to_le64(addr); xhci_dbg(xhci, "Setting stream %d ring ptr to 0x%08llx\n", cur_stream, addr); ret = xhci_update_stream_mapping(cur_ring, mem_flags); 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). */ 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) { xhci_ring_free(xhci, cur_ring); stream_info->stream_rings[cur_stream] = NULL; } } xhci_free_command(xhci, stream_info->free_streams_command); cleanup_ctx: xhci_free_stream_ctx(xhci, stream_info->num_stream_ctxs, stream_info->stream_ctx_array, stream_info->ctx_array_dma); cleanup_ring_array: 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_trace(xhci, trace_xhci_dbg_context_change, "Setting number of stream ctx array entries to %u", 1 << (max_primary_streams + 1)); ep_ctx->ep_info &= cpu_to_le32(~EP_MAXPSTREAMS_MASK); ep_ctx->ep_info |= cpu_to_le32(EP_MAXPSTREAMS(max_primary_streams) | EP_HAS_LSA); ep_ctx->deq = cpu_to_le64(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_ep_ctx *ep_ctx, struct xhci_virt_ep *ep) { dma_addr_t addr; ep_ctx->ep_info &= cpu_to_le32(~(EP_MAXPSTREAMS_MASK | EP_HAS_LSA)); addr = xhci_trb_virt_to_dma(ep->ring->deq_seg, ep->ring->dequeue); ep_ctx->deq = cpu_to_le64(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; 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) { 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); kfree(stream_info->stream_rings); kfree(stream_info); } /***************** Device context manipulation *************************/ static void xhci_free_tt_info(struct xhci_hcd *xhci, struct xhci_virt_device *virt_dev, int slot_id) { struct list_head *tt_list_head; struct xhci_tt_bw_info *tt_info, *next; bool slot_found = false; /* If the device never made it past the Set Address stage, * it may not have the real_port set correctly. */ if (virt_dev->real_port == 0 || virt_dev->real_port > HCS_MAX_PORTS(xhci->hcs_params1)) { xhci_dbg(xhci, "Bad real port.\n"); return; } tt_list_head = &(xhci->rh_bw[virt_dev->real_port - 1].tts); list_for_each_entry_safe(tt_info, next, tt_list_head, tt_list) { /* Multi-TT hubs will have more than one entry */ if (tt_info->slot_id == slot_id) { slot_found = true; list_del(&tt_info->tt_list); kfree(tt_info); } else if (slot_found) { break; } } } int xhci_alloc_tt_info(struct xhci_hcd *xhci, struct xhci_virt_device *virt_dev, struct usb_device *hdev, struct usb_tt *tt, gfp_t mem_flags) { struct xhci_tt_bw_info *tt_info; unsigned int num_ports; int i, j; struct device *dev = xhci_to_hcd(xhci)->self.sysdev; if (!tt->multi) num_ports = 1; else num_ports = hdev->maxchild; for (i = 0; i < num_ports; i++, tt_info++) { struct xhci_interval_bw_table *bw_table; tt_info = kzalloc_node(sizeof(*tt_info), mem_flags, dev_to_node(dev)); if (!tt_info) goto free_tts; INIT_LIST_HEAD(&tt_info->tt_list); list_add(&tt_info->tt_list, &xhci->rh_bw[virt_dev->real_port - 1].tts); tt_info->slot_id = virt_dev->udev->slot_id; if (tt->multi) tt_info->ttport = i+1; bw_table = &tt_info->bw_table; for (j = 0; j < XHCI_MAX_INTERVAL; j++) INIT_LIST_HEAD(&bw_table->interval_bw[j].endpoints); } return 0; free_tts: xhci_free_tt_info(xhci, virt_dev, virt_dev->udev->slot_id); return -ENOMEM; } /* All the xhci_tds in the ring's TD list should be freed at this point. * Should be called with xhci->lock held if there is any chance the TT lists * will be manipulated by the configure endpoint, allocate device, or update * hub functions while this function is removing the TT entries from the list. */ void xhci_free_virt_device(struct xhci_hcd *xhci, int slot_id) { struct xhci_virt_device *dev; int i; int old_active_eps = 0; /* Slot ID 0 is reserved */ if (slot_id == 0 || !xhci->devs[slot_id]) return; dev = xhci->devs[slot_id]; xhci->dcbaa->dev_context_ptrs[slot_id] = 0; if (!dev) return; trace_xhci_free_virt_device(dev); if (dev->tt_info) old_active_eps = dev->tt_info->active_eps; 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); /* * Endpoints are normally deleted from the bandwidth list when * endpoints are dropped, before device is freed. * If host is dying or being removed then endpoints aren't * dropped cleanly, so delete the endpoint from list here. * Only applicable for hosts with software bandwidth checking. */ if (!list_empty(&dev->eps[i].bw_endpoint_list)) { list_del_init(&dev->eps[i].bw_endpoint_list); xhci_dbg(xhci, "Slot %u endpoint %u not removed from BW list!\n", slot_id, i); } } /* If this is a hub, free the TT(s) from the TT list */ xhci_free_tt_info(xhci, dev, slot_id); /* If necessary, update the number of active TTs on this root port */ xhci_update_tt_active_eps(xhci, dev, old_active_eps); if (dev->in_ctx) xhci_free_container_ctx(xhci, dev->in_ctx); if (dev->out_ctx) xhci_free_container_ctx(xhci, dev->out_ctx); if (dev->udev && dev->udev->slot_id) dev->udev->slot_id = 0; kfree(xhci->devs[slot_id]); xhci->devs[slot_id] = NULL; } /* * Free a virt_device structure. * If the virt_device added a tt_info (a hub) and has children pointing to * that tt_info, then free the child first. Recursive. * We can't rely on udev at this point to find child-parent relationships. */ static void xhci_free_virt_devices_depth_first(struct xhci_hcd *xhci, int slot_id) { struct xhci_virt_device *vdev; struct list_head *tt_list_head; struct xhci_tt_bw_info *tt_info, *next; int i; vdev = xhci->devs[slot_id]; if (!vdev) return; if (vdev->real_port == 0 || vdev->real_port > HCS_MAX_PORTS(xhci->hcs_params1)) { xhci_dbg(xhci, "Bad vdev->real_port.\n"); goto out; } tt_list_head = &(xhci->rh_bw[vdev->real_port - 1].tts); list_for_each_entry_safe(tt_info, next, tt_list_head, tt_list) { /* is this a hub device that added a tt_info to the tts list */ if (tt_info->slot_id == slot_id) { /* are any devices using this tt_info? */ for (i = 1; i < HCS_MAX_SLOTS(xhci->hcs_params1); i++) { vdev = xhci->devs[i]; if (vdev && (vdev->tt_info == tt_info)) xhci_free_virt_devices_depth_first( xhci, i); } } } out: /* we are now at a leaf device */ xhci_debugfs_remove_slot(xhci, slot_id); xhci_free_virt_device(xhci, slot_id); } int xhci_alloc_virt_device(struct xhci_hcd *xhci, int slot_id, struct usb_device *udev, gfp_t flags) { struct xhci_virt_device *dev; int i; /* Slot ID 0 is reserved */ if (slot_id == 0 || xhci->devs[slot_id]) { xhci_warn(xhci, "Bad Slot ID %d\n", slot_id); return 0; } dev = kzalloc(sizeof(*dev), flags); if (!dev) return 0; dev->slot_id = slot_id; /* Allocate the (output) device context that will be used in the HC. */ dev->out_ctx = xhci_alloc_container_ctx(xhci, XHCI_CTX_TYPE_DEVICE, flags); if (!dev->out_ctx) goto fail; xhci_dbg(xhci, "Slot %d output ctx = 0x%pad (dma)\n", slot_id, &dev->out_ctx->dma); /* Allocate the (input) device context for address device command */ dev->in_ctx = xhci_alloc_container_ctx(xhci, XHCI_CTX_TYPE_INPUT, flags); if (!dev->in_ctx) goto fail; xhci_dbg(xhci, "Slot %d input ctx = 0x%pad (dma)\n", slot_id, &dev->in_ctx->dma); /* Initialize the cancellation and bandwidth list for each ep */ for (i = 0; i < 31; i++) { dev->eps[i].ep_index = i; dev->eps[i].vdev = dev; dev->eps[i].xhci = xhci; INIT_LIST_HEAD(&dev->eps[i].cancelled_td_list); INIT_LIST_HEAD(&dev->eps[i].bw_endpoint_list); } /* Allocate endpoint 0 ring */ dev->eps[0].ring = xhci_ring_alloc(xhci, 2, 1, TYPE_CTRL, 0, flags); if (!dev->eps[0].ring) goto fail; dev->udev = udev; /* Point to output device context in dcbaa. */ xhci->dcbaa->dev_context_ptrs[slot_id] = cpu_to_le64(dev->out_ctx->dma); xhci_dbg(xhci, "Set slot id %d dcbaa entry %p to 0x%llx\n", slot_id, &xhci->dcbaa->dev_context_ptrs[slot_id], le64_to_cpu(xhci->dcbaa->dev_context_ptrs[slot_id])); trace_xhci_alloc_virt_device(dev); xhci->devs[slot_id] = dev; return 1; fail: if (dev->in_ctx) xhci_free_container_ctx(xhci, dev->in_ctx); if (dev->out_ctx) xhci_free_container_ctx(xhci, dev->out_ctx); kfree(dev); return 0; } void xhci_copy_ep0_dequeue_into_input_ctx(struct xhci_hcd *xhci, struct usb_device *udev) { struct xhci_virt_device *virt_dev; struct xhci_ep_ctx *ep0_ctx; struct xhci_ring *ep_ring; virt_dev = xhci->devs[udev->slot_id]; ep0_ctx = xhci_get_ep_ctx(xhci, virt_dev->in_ctx, 0); ep_ring = virt_dev->eps[0].ring; /* * FIXME we don't keep track of the dequeue pointer very well after a * Set TR dequeue pointer, so we're setting the dequeue pointer of the * host to our enqueue pointer. This should only be called after a * configured device has reset, so all control transfers should have * been completed or cancelled before the reset. */ ep0_ctx->deq = cpu_to_le64(xhci_trb_virt_to_dma(ep_ring->enq_seg, ep_ring->enqueue) | ep_ring->cycle_state); } /* * The xHCI roothub may have ports of differing speeds in any order in the port * status registers. * * The xHCI hardware wants to know the roothub port number that the USB device * is attached to (or the roothub port its ancestor hub is attached to). All we * know is the index of that port under either the USB 2.0 or the USB 3.0 * roothub, but that doesn't give us the real index into the HW port status * registers. Call xhci_find_raw_port_number() to get real index. */ static u32 xhci_find_real_port_number(struct xhci_hcd *xhci, struct usb_device *udev) { struct usb_device *top_dev; struct usb_hcd *hcd; if (udev->speed >= USB_SPEED_SUPER) hcd = xhci_get_usb3_hcd(xhci); else hcd = xhci->main_hcd; for (top_dev = udev; top_dev->parent && top_dev->parent->parent; top_dev = top_dev->parent) /* Found device below root hub */; return xhci_find_raw_port_number(hcd, top_dev->portnum); } /* Setup an xHCI virtual device for a Set Address command */ int xhci_setup_addressable_virt_dev(struct xhci_hcd *xhci, struct usb_device *udev) { struct xhci_virt_device *dev; struct xhci_ep_ctx *ep0_ctx; struct xhci_slot_ctx *slot_ctx; u32 port_num; u32 max_packets; struct usb_device *top_dev; dev = xhci->devs[udev->slot_id]; /* Slot ID 0 is reserved */ if (udev->slot_id == 0 || !dev) { xhci_warn(xhci, "Slot ID %d is not assigned to this device\n", udev->slot_id); return -EINVAL; } ep0_ctx = xhci_get_ep_ctx(xhci, dev->in_ctx, 0); slot_ctx = xhci_get_slot_ctx(xhci, dev->in_ctx); /* 3) Only the control endpoint is valid - one endpoint context */ slot_ctx->dev_info |= cpu_to_le32(LAST_CTX(1) | udev->route); switch (udev->speed) { case USB_SPEED_SUPER_PLUS: slot_ctx->dev_info |= cpu_to_le32(SLOT_SPEED_SSP); max_packets = MAX_PACKET(512); break; case USB_SPEED_SUPER: slot_ctx->dev_info |= cpu_to_le32(SLOT_SPEED_SS); max_packets = MAX_PACKET(512); break; case USB_SPEED_HIGH: slot_ctx->dev_info |= cpu_to_le32(SLOT_SPEED_HS); max_packets = MAX_PACKET(64); break; /* USB core guesses at a 64-byte max packet first for FS devices */ case USB_SPEED_FULL: slot_ctx->dev_info |= cpu_to_le32(SLOT_SPEED_FS); max_packets = MAX_PACKET(64); break; case USB_SPEED_LOW: slot_ctx->dev_info |= cpu_to_le32(SLOT_SPEED_LS); max_packets = MAX_PACKET(8); break; default: /* Speed was set earlier, this shouldn't happen. */ return -EINVAL; } /* Find the root hub port this device is under */ port_num = xhci_find_real_port_number(xhci, udev); if (!port_num) return -EINVAL; slot_ctx->dev_info2 |= cpu_to_le32(ROOT_HUB_PORT(port_num)); /* Set the port number in the virtual_device to the faked port number */ for (top_dev = udev; top_dev->parent && top_dev->parent->parent; top_dev = top_dev->parent) /* Found device below root hub */; dev->fake_port = top_dev->portnum; dev->real_port = port_num; xhci_dbg(xhci, "Set root hub portnum to %d\n", port_num); xhci_dbg(xhci, "Set fake root hub portnum to %d\n", dev->fake_port); /* Find the right bandwidth table that this device will be a part of. * If this is a full speed device attached directly to a root port (or a * decendent of one), it counts as a primary bandwidth domain, not a * secondary bandwidth domain under a TT. An xhci_tt_info structure * will never be created for the HS root hub. */ if (!udev->tt || !udev->tt->hub->parent) { dev->bw_table = &xhci->rh_bw[port_num - 1].bw_table; } else { struct xhci_root_port_bw_info *rh_bw; struct xhci_tt_bw_info *tt_bw; rh_bw = &xhci->rh_bw[port_num - 1]; /* Find the right TT. */ list_for_each_entry(tt_bw, &rh_bw->tts, tt_list) { if (tt_bw->slot_id != udev->tt->hub->slot_id) continue; if (!dev->udev->tt->multi || (udev->tt->multi && tt_bw->ttport == dev->udev->ttport)) { dev->bw_table = &tt_bw->bw_table; dev->tt_info = tt_bw; break; } } if (!dev->tt_info) xhci_warn(xhci, "WARN: Didn't find a matching TT\n"); } /* Is this a LS/FS device under an external HS hub? */ if (udev->tt && udev->tt->hub->parent) { slot_ctx->tt_info = cpu_to_le32(udev->tt->hub->slot_id | (udev->ttport << 8)); if (udev->tt->multi) slot_ctx->dev_info |= cpu_to_le32(DEV_MTT); } xhci_dbg(xhci, "udev->tt = %p\n", udev->tt); xhci_dbg(xhci, "udev->ttport = 0x%x\n", udev->ttport); /* Step 4 - ring already allocated */ /* Step 5 */ ep0_ctx->ep_info2 = cpu_to_le32(EP_TYPE(CTRL_EP)); /* EP 0 can handle "burst" sizes of 1, so Max Burst Size field is 0 */ ep0_ctx->ep_info2 |= cpu_to_le32(MAX_BURST(0) | ERROR_COUNT(3) | max_packets); ep0_ctx->deq = cpu_to_le64(dev->eps[0].ring->first_seg->dma | dev->eps[0].ring->cycle_state); trace_xhci_setup_addressable_virt_device(dev); /* Steps 7 and 8 were done in xhci_alloc_virt_device() */ return 0; } /* * Convert interval expressed as 2^(bInterval - 1) == interval into * straight exponent value 2^n == interval. * */ static unsigned int xhci_parse_exponent_interval(struct usb_device *udev, struct usb_host_endpoint *ep) { unsigned int interval; interval = clamp_val(ep->desc.bInterval, 1, 16) - 1; if (interval != ep->desc.bInterval - 1) dev_warn(&udev->dev, "ep %#x - rounding interval to %d %sframes\n", ep->desc.bEndpointAddress, 1 << interval, udev->speed == USB_SPEED_FULL ? "" : "micro"); if (udev->speed == USB_SPEED_FULL) { /* * Full speed isoc endpoints specify interval in frames, * not microframes. We are using microframes everywhere, * so adjust accordingly. */ interval += 3; /* 1 frame = 2^3 uframes */ } return interval; } /* * Convert bInterval expressed in microframes (in 1-255 range) to exponent of * microframes, rounded down to nearest power of 2. */ static unsigned int xhci_microframes_to_exponent(struct usb_device *udev, struct usb_host_endpoint *ep, unsigned int desc_interval, unsigned int min_exponent, unsigned int max_exponent) { unsigned int interval; interval = fls(desc_interval) - 1; interval = clamp_val(interval, min_exponent, max_exponent); if ((1 << interval) != desc_interval) dev_dbg(&udev->dev, "ep %#x - rounding interval to %d microframes, ep desc says %d microframes\n", ep->desc.bEndpointAddress, 1 << interval, desc_interval); return interval; } static unsigned int xhci_parse_microframe_interval(struct usb_device *udev, struct usb_host_endpoint *ep) { if (ep->desc.bInterval == 0) return 0; return xhci_microframes_to_exponent(udev, ep, ep->desc.bInterval, 0, 15); } static unsigned int xhci_parse_frame_interval(struct usb_device *udev, struct usb_host_endpoint *ep) { return xhci_microframes_to_exponent(udev, ep, ep->desc.bInterval * 8, 3, 10); } /* Return the polling or NAK interval. * * The polling interval is expressed in "microframes". If xHCI's Interval field * is set to N, it will service the endpoint every 2^(Interval)*125us. * * The NAK interval is one NAK per 1 to 255 microframes, or no NAKs if interval * is set to 0. */ static unsigned int xhci_get_endpoint_interval(struct usb_device *udev, struct usb_host_endpoint *ep) { unsigned int interval = 0; switch (udev->speed) { case USB_SPEED_HIGH: /* Max NAK rate */ if (usb_endpoint_xfer_control(&ep->desc) || usb_endpoint_xfer_bulk(&ep->desc)) { interval = xhci_parse_microframe_interval(udev, ep); break; } fallthrough; /* SS and HS isoc/int have same decoding */ case USB_SPEED_SUPER_PLUS: case USB_SPEED_SUPER: if (usb_endpoint_xfer_int(&ep->desc) || usb_endpoint_xfer_isoc(&ep->desc)) { interval = xhci_parse_exponent_interval(udev, ep); } break; case USB_SPEED_FULL: if (usb_endpoint_xfer_isoc(&ep->desc)) { interval = xhci_parse_exponent_interval(udev, ep); break; } /* * Fall through for interrupt endpoint interval decoding * since it uses the same rules as low speed interrupt * endpoints. */ fallthrough; case USB_SPEED_LOW: if (usb_endpoint_xfer_int(&ep->desc) || usb_endpoint_xfer_isoc(&ep->desc)) { interval = xhci_parse_frame_interval(udev, ep); } break; default: BUG(); } return interval; } /* The "Mult" field in the endpoint context is only set for SuperSpeed isoc eps. * High speed endpoint descriptors can define "the number of additional * transaction opportunities per microframe", but that goes in the Max Burst * endpoint context field. */ static u32 xhci_get_endpoint_mult(struct usb_device *udev, struct usb_host_endpoint *ep) { if (udev->speed < USB_SPEED_SUPER || !usb_endpoint_xfer_isoc(&ep->desc)) return 0; return ep->ss_ep_comp.bmAttributes; } static u32 xhci_get_endpoint_max_burst(struct usb_device *udev, struct usb_host_endpoint *ep) { /* Super speed and Plus have max burst in ep companion desc */ if (udev->speed >= USB_SPEED_SUPER) return ep->ss_ep_comp.bMaxBurst; if (udev->speed == USB_SPEED_HIGH && (usb_endpoint_xfer_isoc(&ep->desc) || usb_endpoint_xfer_int(&ep->desc))) return usb_endpoint_maxp_mult(&ep->desc) - 1; return 0; } static u32 xhci_get_endpoint_type(struct usb_host_endpoint *ep) { int in; in = usb_endpoint_dir_in(&ep->desc); switch (usb_endpoint_type(&ep->desc)) { case USB_ENDPOINT_XFER_CONTROL: return CTRL_EP; case USB_ENDPOINT_XFER_BULK: return in ? BULK_IN_EP : BULK_OUT_EP; case USB_ENDPOINT_XFER_ISOC: return in ? ISOC_IN_EP : ISOC_OUT_EP; case USB_ENDPOINT_XFER_INT: return in ? INT_IN_EP : INT_OUT_EP; } return 0; } /* Return the maximum endpoint service interval time (ESIT) payload. * Basically, this is the maxpacket size, multiplied by the burst size * and mult size. */ static u32 xhci_get_max_esit_payload(struct usb_device *udev, struct usb_host_endpoint *ep) { int max_burst; int max_packet; /* Only applies for interrupt or isochronous endpoints */ if (usb_endpoint_xfer_control(&ep->desc) || usb_endpoint_xfer_bulk(&ep->desc)) return 0; /* SuperSpeedPlus Isoc ep sending over 48k per esit */ if ((udev->speed >= USB_SPEED_SUPER_PLUS) && USB_SS_SSP_ISOC_COMP(ep->ss_ep_comp.bmAttributes)) return le32_to_cpu(ep->ssp_isoc_ep_comp.dwBytesPerInterval); /* SuperSpeed or SuperSpeedPlus Isoc ep with less than 48k per esit */ if (udev->speed >= USB_SPEED_SUPER) return le16_to_cpu(ep->ss_ep_comp.wBytesPerInterval); max_packet = usb_endpoint_maxp(&ep->desc); max_burst = usb_endpoint_maxp_mult(&ep->desc); /* A 0 in max burst means 1 transfer per ESIT */ return max_packet * max_burst; } /* 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, struct usb_host_endpoint *ep, gfp_t mem_flags) { unsigned int ep_index; struct xhci_ep_ctx *ep_ctx; struct xhci_ring *ep_ring; unsigned int max_packet; enum xhci_ring_type ring_type; u32 max_esit_payload; u32 endpoint_type; unsigned int max_burst; unsigned int interval; unsigned int mult; unsigned int avg_trb_len; unsigned int err_count = 0; ep_index = xhci_get_endpoint_index(&ep->desc); ep_ctx = xhci_get_ep_ctx(xhci, virt_dev->in_ctx, ep_index); endpoint_type = xhci_get_endpoint_type(ep); if (!endpoint_type) return -EINVAL; ring_type = usb_endpoint_type(&ep->desc); /* * Get values to fill the endpoint context, mostly from ep descriptor. * The average TRB buffer lengt for bulk endpoints is unclear as we * have no clue on scatter gather list entry size. For Isoc and Int, * set it to max available. See xHCI 1.1 spec 4.14.1.1 for details. */ max_esit_payload = xhci_get_max_esit_payload(udev, ep); interval = xhci_get_endpoint_interval(udev, ep); /* Periodic endpoint bInterval limit quirk */ if (usb_endpoint_xfer_int(&ep->desc) || usb_endpoint_xfer_isoc(&ep->desc)) { if ((xhci->quirks & XHCI_LIMIT_ENDPOINT_INTERVAL_7) && udev->speed >= USB_SPEED_HIGH && interval >= 7) { interval = 6; } } mult = xhci_get_endpoint_mult(udev, ep); max_packet = usb_endpoint_maxp(&ep->desc); max_burst = xhci_get_endpoint_max_burst(udev, ep); avg_trb_len = max_esit_payload; /* FIXME dig Mult and streams info out of ep companion desc */ /* Allow 3 retries for everything but isoc, set CErr = 3 */ if (!usb_endpoint_xfer_isoc(&ep->desc)) err_count = 3; /* HS bulk max packet should be 512, FS bulk supports 8, 16, 32 or 64 */ if (usb_endpoint_xfer_bulk(&ep->desc)) { if (udev->speed == USB_SPEED_HIGH) max_packet = 512; if (udev->speed == USB_SPEED_FULL) { max_packet = rounddown_pow_of_two(max_packet); max_packet = clamp_val(max_packet, 8, 64); } } /* xHCI 1.0 and 1.1 indicates that ctrl ep avg TRB Length should be 8 */ if (usb_endpoint_xfer_control(&ep->desc) && xhci->hci_version >= 0x100) avg_trb_len = 8; /* xhci 1.1 with LEC support doesn't use mult field, use RsvdZ */ if ((xhci->hci_version > 0x100) && HCC2_LEC(xhci->hcc_params2)) mult = 0; /* Set up the endpoint ring */ virt_dev->eps[ep_index].new_ring = xhci_ring_alloc(xhci, 2, 1, ring_type, max_packet, mem_flags); if (!virt_dev->eps[ep_index].new_ring) return -ENOMEM; virt_dev->eps[ep_index].skip = false; ep_ring = virt_dev->eps[ep_index].new_ring; /* Fill the endpoint context */ ep_ctx->ep_info = cpu_to_le32(EP_MAX_ESIT_PAYLOAD_HI(max_esit_payload) | EP_INTERVAL(interval) | EP_MULT(mult)); ep_ctx->ep_info2 = cpu_to_le32(EP_TYPE(endpoint_type) | MAX_PACKET(max_packet) | MAX_BURST(max_burst) | ERROR_COUNT(err_count)); ep_ctx->deq = cpu_to_le64(ep_ring->first_seg->dma | ep_ring->cycle_state); ep_ctx->tx_info = cpu_to_le32(EP_MAX_ESIT_PAYLOAD_LO(max_esit_payload) | EP_AVG_TRB_LENGTH(avg_trb_len)); return 0; } void xhci_endpoint_zero(struct xhci_hcd *xhci, struct xhci_virt_device *virt_dev, struct usb_host_endpoint *ep) { unsigned int ep_index; struct xhci_ep_ctx *ep_ctx; ep_index = xhci_get_endpoint_index(&ep->desc); ep_ctx = xhci_get_ep_ctx(xhci, virt_dev->in_ctx, ep_index); ep_ctx->ep_info = 0; ep_ctx->ep_info2 = 0; ep_ctx->deq = 0; ep_ctx->tx_info = 0; /* Don't free the endpoint ring until the set interface or configuration * request succeeds. */ } void xhci_clear_endpoint_bw_info(struct xhci_bw_info *bw_info) { bw_info->ep_interval = 0; bw_info->mult = 0; bw_info->num_packets = 0; bw_info->max_packet_size = 0; bw_info->type = 0; bw_info->max_esit_payload = 0; } void xhci_update_bw_info(struct xhci_hcd *xhci, struct xhci_container_ctx *in_ctx, struct xhci_input_control_ctx *ctrl_ctx, struct xhci_virt_device *virt_dev) { struct xhci_bw_info *bw_info; struct xhci_ep_ctx *ep_ctx; unsigned int ep_type; int i; for (i = 1; i < 31; i++) { bw_info = &virt_dev->eps[i].bw_info; /* We can't tell what endpoint type is being dropped, but * unconditionally clearing the bandwidth info for non-periodic * endpoints should be harmless because the info will never be * set in the first place. */ if (!EP_IS_ADDED(ctrl_ctx, i) && EP_IS_DROPPED(ctrl_ctx, i)) { /* Dropped endpoint */ xhci_clear_endpoint_bw_info(bw_info); continue; } if (EP_IS_ADDED(ctrl_ctx, i)) { ep_ctx = xhci_get_ep_ctx(xhci, in_ctx, i); ep_type = CTX_TO_EP_TYPE(le32_to_cpu(ep_ctx->ep_info2)); /* Ignore non-periodic endpoints */ if (ep_type != ISOC_OUT_EP && ep_type != INT_OUT_EP && ep_type != ISOC_IN_EP && ep_type != INT_IN_EP) continue; /* Added or changed endpoint */ bw_info->ep_interval = CTX_TO_EP_INTERVAL( le32_to_cpu(ep_ctx->ep_info)); /* Number of packets and mult are zero-based in the * input context, but we want one-based for the * interval table. */ bw_info->mult = CTX_TO_EP_MULT( le32_to_cpu(ep_ctx->ep_info)) + 1; bw_info->num_packets = CTX_TO_MAX_BURST( le32_to_cpu(ep_ctx->ep_info2)) + 1; bw_info->max_packet_size = MAX_PACKET_DECODED( le32_to_cpu(ep_ctx->ep_info2)); bw_info->type = ep_type; bw_info->max_esit_payload = CTX_TO_MAX_ESIT_PAYLOAD( le32_to_cpu(ep_ctx->tx_info)); } } } /* Copy output xhci_ep_ctx to the input xhci_ep_ctx copy. * Useful when you want to change one particular aspect of the endpoint and then * issue a configure endpoint command. */ void xhci_endpoint_copy(struct xhci_hcd *xhci, struct xhci_container_ctx *in_ctx, struct xhci_container_ctx *out_ctx, unsigned int ep_index) { struct xhci_ep_ctx *out_ep_ctx; struct xhci_ep_ctx *in_ep_ctx; out_ep_ctx = xhci_get_ep_ctx(xhci, out_ctx, ep_index); in_ep_ctx = xhci_get_ep_ctx(xhci, in_ctx, ep_index); in_ep_ctx->ep_info = out_ep_ctx->ep_info; in_ep_ctx->ep_info2 = out_ep_ctx->ep_info2; in_ep_ctx->deq = out_ep_ctx->deq; in_ep_ctx->tx_info = out_ep_ctx->tx_info; if (xhci->quirks & XHCI_MTK_HOST) { in_ep_ctx->reserved[0] = out_ep_ctx->reserved[0]; in_ep_ctx->reserved[1] = out_ep_ctx->reserved[1]; } } /* Copy output xhci_slot_ctx to the input xhci_slot_ctx. * Useful when you want to change one particular aspect of the endpoint and then * issue a configure endpoint command. Only the context entries field matters, * but we'll copy the whole thing anyway. */ void xhci_slot_copy(struct xhci_hcd *xhci, struct xhci_container_ctx *in_ctx, struct xhci_container_ctx *out_ctx) { struct xhci_slot_ctx *in_slot_ctx; struct xhci_slot_ctx *out_slot_ctx; in_slot_ctx = xhci_get_slot_ctx(xhci, in_ctx); out_slot_ctx = xhci_get_slot_ctx(xhci, out_ctx); in_slot_ctx->dev_info = out_slot_ctx->dev_info; in_slot_ctx->dev_info2 = out_slot_ctx->dev_info2; in_slot_ctx->tt_info = out_slot_ctx->tt_info; in_slot_ctx->dev_state = out_slot_ctx->dev_state; } /* Set up the scratchpad buffer array and scratchpad buffers, if needed. */ static int scratchpad_alloc(struct xhci_hcd *xhci, gfp_t flags) { int i; struct device *dev = xhci_to_hcd(xhci)->self.sysdev; int num_sp = HCS_MAX_SCRATCHPAD(xhci->hcs_params2); xhci_dbg_trace(xhci, trace_xhci_dbg_init, "Allocating %d scratchpad buffers", num_sp); if (!num_sp) return 0; xhci->scratchpad = kzalloc_node(sizeof(*xhci->scratchpad), flags, dev_to_node(dev)); if (!xhci->scratchpad) goto fail_sp; xhci->scratchpad->sp_array = dma_alloc_coherent(dev, size_mul(sizeof(u64), num_sp), &xhci->scratchpad->sp_dma, flags); if (!xhci->scratchpad->sp_array) goto fail_sp2; xhci->scratchpad->sp_buffers = kcalloc_node(num_sp, sizeof(void *), flags, dev_to_node(dev)); if (!xhci->scratchpad->sp_buffers) goto fail_sp3; xhci->dcbaa->dev_context_ptrs[0] = cpu_to_le64(xhci->scratchpad->sp_dma); for (i = 0; i < num_sp; i++) { dma_addr_t dma; void *buf = dma_alloc_coherent(dev, xhci->page_size, &dma, flags); if (!buf) goto fail_sp4; xhci->scratchpad->sp_array[i] = dma; xhci->scratchpad->sp_buffers[i] = buf; } return 0; fail_sp4: while (i--) dma_free_coherent(dev, xhci->page_size, xhci->scratchpad->sp_buffers[i], xhci->scratchpad->sp_array[i]); kfree(xhci->scratchpad->sp_buffers); fail_sp3: dma_free_coherent(dev, num_sp * sizeof(u64), xhci->scratchpad->sp_array, xhci->scratchpad->sp_dma); fail_sp2: kfree(xhci->scratchpad); xhci->scratchpad = NULL; fail_sp: return -ENOMEM; } static void scratchpad_free(struct xhci_hcd *xhci) { int num_sp; int i; struct device *dev = xhci_to_hcd(xhci)->self.sysdev; if (!xhci->scratchpad) return; num_sp = HCS_MAX_SCRATCHPAD(xhci->hcs_params2); for (i = 0; i < num_sp; i++) { dma_free_coherent(dev, xhci->page_size, xhci->scratchpad->sp_buffers[i], xhci->scratchpad->sp_array[i]); } kfree(xhci->scratchpad->sp_buffers); dma_free_coherent(dev, num_sp * sizeof(u64), xhci->scratchpad->sp_array, xhci->scratchpad->sp_dma); kfree(xhci->scratchpad); xhci->scratchpad = NULL; } struct xhci_command *xhci_alloc_command(struct xhci_hcd *xhci, bool allocate_completion, gfp_t mem_flags) { struct xhci_command *command; struct device *dev = xhci_to_hcd(xhci)->self.sysdev; command = kzalloc_node(sizeof(*command), mem_flags, dev_to_node(dev)); if (!command) return NULL; if (allocate_completion) { command->completion = kzalloc_node(sizeof(struct completion), mem_flags, dev_to_node(dev)); if (!command->completion) { kfree(command); return NULL; } init_completion(command->completion); } command->status = 0; INIT_LIST_HEAD(&command->cmd_list); return command; } struct xhci_command *xhci_alloc_command_with_ctx(struct xhci_hcd *xhci, bool allocate_completion, gfp_t mem_flags) { struct xhci_command *command; command = xhci_alloc_command(xhci, allocate_completion, mem_flags); if (!command) return NULL; command->in_ctx = xhci_alloc_container_ctx(xhci, XHCI_CTX_TYPE_INPUT, mem_flags); if (!command->in_ctx) { kfree(command->completion); kfree(command); return NULL; } return command; } void xhci_urb_free_priv(struct urb_priv *urb_priv) { kfree(urb_priv); } void xhci_free_command(struct xhci_hcd *xhci, struct xhci_command *command) { xhci_free_container_ctx(xhci, command->in_ctx); kfree(command->completion); kfree(command); } static int xhci_alloc_erst(struct xhci_hcd *xhci, struct xhci_ring *evt_ring, struct xhci_erst *erst, gfp_t flags) { size_t size; unsigned int val; struct xhci_segment *seg; struct xhci_erst_entry *entry; size = size_mul(sizeof(struct xhci_erst_entry), evt_ring->num_segs); erst->entries = dma_alloc_coherent(xhci_to_hcd(xhci)->self.sysdev, size, &erst->erst_dma_addr, flags); if (!erst->entries) return -ENOMEM; erst->num_entries = evt_ring->num_segs; seg = evt_ring->first_seg; for (val = 0; val < evt_ring->num_segs; val++) { entry = &erst->entries[val]; entry->seg_addr = cpu_to_le64(seg->dma); entry->seg_size = cpu_to_le32(TRBS_PER_SEGMENT); entry->rsvd = 0; seg = seg->next; } return 0; } static void xhci_remove_interrupter(struct xhci_hcd *xhci, struct xhci_interrupter *ir) { u32 tmp; if (!ir) return; /* * Clean out interrupter registers except ERSTBA. Clearing either the * low or high 32 bits of ERSTBA immediately causes the controller to * dereference the partially cleared 64 bit address, causing IOMMU error. */ if (ir->ir_set) { tmp = readl(&ir->ir_set->erst_size); tmp &= ERST_SIZE_MASK; writel(tmp, &ir->ir_set->erst_size); xhci_write_64(xhci, ERST_EHB, &ir->ir_set->erst_dequeue); } } static void xhci_free_interrupter(struct xhci_hcd *xhci, struct xhci_interrupter *ir) { struct device *dev = xhci_to_hcd(xhci)->self.sysdev; size_t erst_size; if (!ir) return; erst_size = sizeof(struct xhci_erst_entry) * ir->erst.num_entries; if (ir->erst.entries) dma_free_coherent(dev, erst_size, ir->erst.entries, ir->erst.erst_dma_addr); ir->erst.entries = NULL; /* free interrupter event ring */ if (ir->event_ring) xhci_ring_free(xhci, ir->event_ring); ir->event_ring = NULL; kfree(ir); } void xhci_mem_cleanup(struct xhci_hcd *xhci) { struct device *dev = xhci_to_hcd(xhci)->self.sysdev; int i, j, num_ports; cancel_delayed_work_sync(&xhci->cmd_timer); xhci_remove_interrupter(xhci, xhci->interrupter); xhci_free_interrupter(xhci, xhci->interrupter); xhci->interrupter = NULL; xhci_dbg_trace(xhci, trace_xhci_dbg_init, "Freed primary event ring"); if (xhci->cmd_ring) xhci_ring_free(xhci, xhci->cmd_ring); xhci->cmd_ring = NULL; xhci_dbg_trace(xhci, trace_xhci_dbg_init, "Freed command ring"); xhci_cleanup_command_queue(xhci); num_ports = HCS_MAX_PORTS(xhci->hcs_params1); for (i = 0; i < num_ports && xhci->rh_bw; i++) { struct xhci_interval_bw_table *bwt = &xhci->rh_bw[i].bw_table; for (j = 0; j < XHCI_MAX_INTERVAL; j++) { struct list_head *ep = &bwt->interval_bw[j].endpoints; while (!list_empty(ep)) list_del_init(ep->next); } } for (i = HCS_MAX_SLOTS(xhci->hcs_params1); i > 0; i--) xhci_free_virt_devices_depth_first(xhci, i); dma_pool_destroy(xhci->segment_pool); xhci->segment_pool = NULL; xhci_dbg_trace(xhci, trace_xhci_dbg_init, "Freed segment pool"); dma_pool_destroy(xhci->device_pool); xhci->device_pool = NULL; xhci_dbg_trace(xhci, trace_xhci_dbg_init, "Freed device context pool"); dma_pool_destroy(xhci->small_streams_pool); xhci->small_streams_pool = NULL; xhci_dbg_trace(xhci, trace_xhci_dbg_init, "Freed small stream array pool"); dma_pool_destroy(xhci->medium_streams_pool); xhci->medium_streams_pool = NULL; xhci_dbg_trace(xhci, trace_xhci_dbg_init, "Freed medium stream array pool"); if (xhci->dcbaa) dma_free_coherent(dev, sizeof(*xhci->dcbaa), xhci->dcbaa, xhci->dcbaa->dma); xhci->dcbaa = NULL; scratchpad_free(xhci); if (!xhci->rh_bw) goto no_bw; for (i = 0; i < num_ports; i++) { struct xhci_tt_bw_info *tt, *n; list_for_each_entry_safe(tt, n, &xhci->rh_bw[i].tts, tt_list) { list_del(&tt->tt_list); kfree(tt); } } no_bw: xhci->cmd_ring_reserved_trbs = 0; xhci->usb2_rhub.num_ports = 0; xhci->usb3_rhub.num_ports = 0; xhci->num_active_eps = 0; kfree(xhci->usb2_rhub.ports); kfree(xhci->usb3_rhub.ports); kfree(xhci->hw_ports); kfree(xhci->rh_bw); kfree(xhci->ext_caps); for (i = 0; i < xhci->num_port_caps; i++) kfree(xhci->port_caps[i].psi); kfree(xhci->port_caps); xhci->num_port_caps = 0; xhci->usb2_rhub.ports = NULL; xhci->usb3_rhub.ports = NULL; xhci->hw_ports = NULL; xhci->rh_bw = NULL; xhci->ext_caps = NULL; xhci->port_caps = NULL; xhci->page_size = 0; xhci->page_shift = 0; xhci->usb2_rhub.bus_state.bus_suspended = 0; xhci->usb3_rhub.bus_state.bus_suspended = 0; } static void xhci_set_hc_event_deq(struct xhci_hcd *xhci, struct xhci_interrupter *ir) { dma_addr_t deq; deq = xhci_trb_virt_to_dma(ir->event_ring->deq_seg, ir->event_ring->dequeue); if (!deq) xhci_warn(xhci, "WARN something wrong with SW event ring dequeue ptr.\n"); /* Update HC event ring dequeue pointer */ /* Don't clear the EHB bit (which is RW1C) because * there might be more events to service. */ xhci_dbg_trace(xhci, trace_xhci_dbg_init, "// Write event ring dequeue pointer, preserving EHB bit"); xhci_write_64(xhci, deq & ERST_PTR_MASK, &ir->ir_set->erst_dequeue); } static void xhci_add_in_port(struct xhci_hcd *xhci, unsigned int num_ports, __le32 __iomem *addr, int max_caps) { u32 temp, port_offset, port_count; int i; u8 major_revision, minor_revision, tmp_minor_revision; struct xhci_hub *rhub; struct device *dev = xhci_to_hcd(xhci)->self.sysdev; struct xhci_port_cap *port_cap; temp = readl(addr); major_revision = XHCI_EXT_PORT_MAJOR(temp); minor_revision = XHCI_EXT_PORT_MINOR(temp); if (major_revision == 0x03) { rhub = &xhci->usb3_rhub; /* * Some hosts incorrectly use sub-minor version for minor * version (i.e. 0x02 instead of 0x20 for bcdUSB 0x320 and 0x01 * for bcdUSB 0x310). Since there is no USB release with sub * minor version 0x301 to 0x309, we can assume that they are * incorrect and fix it here. */ if (minor_revision > 0x00 && minor_revision < 0x10) minor_revision <<= 4; /* * Some zhaoxin's xHCI controller that follow usb3.1 spec * but only support Gen1. */ if (xhci->quirks & XHCI_ZHAOXIN_HOST) { tmp_minor_revision = minor_revision; minor_revision = 0; } } else if (major_revision <= 0x02) { rhub = &xhci->usb2_rhub; } else { xhci_warn(xhci, "Ignoring unknown port speed, Ext Cap %p, revision = 0x%x\n", addr, major_revision); /* Ignoring port protocol we can't understand. FIXME */ return; } /* Port offset and count in the third dword, see section 7.2 */ temp = readl(addr + 2); port_offset = XHCI_EXT_PORT_OFF(temp); port_count = XHCI_EXT_PORT_COUNT(temp); xhci_dbg_trace(xhci, trace_xhci_dbg_init, "Ext Cap %p, port offset = %u, count = %u, revision = 0x%x", addr, port_offset, port_count, major_revision); /* Port count includes the current port offset */ if (port_offset == 0 || (port_offset + port_count - 1) > num_ports) /* WTF? "Valid values are ‘1’ to MaxPorts" */ return; port_cap = &xhci->port_caps[xhci->num_port_caps++]; if (xhci->num_port_caps > max_caps) return; port_cap->psi_count = XHCI_EXT_PORT_PSIC(temp); if (port_cap->psi_count) { port_cap->psi = kcalloc_node(port_cap->psi_count, sizeof(*port_cap->psi), GFP_KERNEL, dev_to_node(dev)); if (!port_cap->psi) port_cap->psi_count = 0; port_cap->psi_uid_count++; for (i = 0; i < port_cap->psi_count; i++) { port_cap->psi[i] = readl(addr + 4 + i); /* count unique ID values, two consecutive entries can * have the same ID if link is assymetric */ if (i && (XHCI_EXT_PORT_PSIV(port_cap->psi[i]) != XHCI_EXT_PORT_PSIV(port_cap->psi[i - 1]))) port_cap->psi_uid_count++; if (xhci->quirks & XHCI_ZHAOXIN_HOST && major_revision == 0x03 && XHCI_EXT_PORT_PSIV(port_cap->psi[i]) >= 5) minor_revision = tmp_minor_revision; xhci_dbg(xhci, "PSIV:%d PSIE:%d PLT:%d PFD:%d LP:%d PSIM:%d\n", XHCI_EXT_PORT_PSIV(port_cap->psi[i]), XHCI_EXT_PORT_PSIE(port_cap->psi[i]), XHCI_EXT_PORT_PLT(port_cap->psi[i]), XHCI_EXT_PORT_PFD(port_cap->psi[i]), XHCI_EXT_PORT_LP(port_cap->psi[i]), XHCI_EXT_PORT_PSIM(port_cap->psi[i])); } } rhub->maj_rev = major_revision; if (rhub->min_rev < minor_revision) rhub->min_rev = minor_revision; port_cap->maj_rev = major_revision; port_cap->min_rev = minor_revision; /* cache usb2 port capabilities */ if (major_revision < 0x03 && xhci->num_ext_caps < max_caps) xhci->ext_caps[xhci->num_ext_caps++] = temp; if ((xhci->hci_version >= 0x100) && (major_revision != 0x03) && (temp & XHCI_HLC)) { xhci_dbg_trace(xhci, trace_xhci_dbg_init, "xHCI 1.0: support USB2 hardware lpm"); xhci->hw_lpm_support = 1; } port_offset--; for (i = port_offset; i < (port_offset + port_count); i++) { struct xhci_port *hw_port = &xhci->hw_ports[i]; /* Duplicate entry. Ignore the port if the revisions differ. */ if (hw_port->rhub) { xhci_warn(xhci, "Duplicate port entry, Ext Cap %p, port %u\n", addr, i); xhci_warn(xhci, "Port was marked as USB %u, duplicated as USB %u\n", hw_port->rhub->maj_rev, major_revision); /* Only adjust the roothub port counts if we haven't * found a similar duplicate. */ if (hw_port->rhub != rhub && hw_port->hcd_portnum != DUPLICATE_ENTRY) { hw_port->rhub->num_ports--; hw_port->hcd_portnum = DUPLICATE_ENTRY; } continue; } hw_port->rhub = rhub; hw_port->port_cap = port_cap; rhub->num_ports++; } /* FIXME: Should we disable ports not in the Extended Capabilities? */ } static void xhci_create_rhub_port_array(struct xhci_hcd *xhci, struct xhci_hub *rhub, gfp_t flags) { int port_index = 0; int i; struct device *dev = xhci_to_hcd(xhci)->self.sysdev; if (!rhub->num_ports) return; rhub->ports = kcalloc_node(rhub->num_ports, sizeof(*rhub->ports), flags, dev_to_node(dev)); if (!rhub->ports) return; for (i = 0; i < HCS_MAX_PORTS(xhci->hcs_params1); i++) { if (xhci->hw_ports[i].rhub != rhub || xhci->hw_ports[i].hcd_portnum == DUPLICATE_ENTRY) continue; xhci->hw_ports[i].hcd_portnum = port_index; rhub->ports[port_index] = &xhci->hw_ports[i]; port_index++; if (port_index == rhub->num_ports) break; } } /* * Scan the Extended Capabilities for the "Supported Protocol Capabilities" that * specify what speeds each port is supposed to be. We can't count on the port * speed bits in the PORTSC register being correct until a device is connected, * but we need to set up the two fake roothubs with the correct number of USB * 3.0 and USB 2.0 ports at host controller initialization time. */ static int xhci_setup_port_arrays(struct xhci_hcd *xhci, gfp_t flags) { void __iomem *base; u32 offset; unsigned int num_ports; int i, j; int cap_count = 0; u32 cap_start; struct device *dev = xhci_to_hcd(xhci)->self.sysdev; num_ports = HCS_MAX_PORTS(xhci->hcs_params1); xhci->hw_ports = kcalloc_node(num_ports, sizeof(*xhci->hw_ports), flags, dev_to_node(dev)); if (!xhci->hw_ports) return -ENOMEM; for (i = 0; i < num_ports; i++) { xhci->hw_ports[i].addr = &xhci->op_regs->port_status_base + NUM_PORT_REGS * i; xhci->hw_ports[i].hw_portnum = i; init_completion(&xhci->hw_ports[i].rexit_done); init_completion(&xhci->hw_ports[i].u3exit_done); } xhci->rh_bw = kcalloc_node(num_ports, sizeof(*xhci->rh_bw), flags, dev_to_node(dev)); if (!xhci->rh_bw) return -ENOMEM; for (i = 0; i < num_ports; i++) { struct xhci_interval_bw_table *bw_table; INIT_LIST_HEAD(&xhci->rh_bw[i].tts); bw_table = &xhci->rh_bw[i].bw_table; for (j = 0; j < XHCI_MAX_INTERVAL; j++) INIT_LIST_HEAD(&bw_table->interval_bw[j].endpoints); } base = &xhci->cap_regs->hc_capbase; cap_start = xhci_find_next_ext_cap(base, 0, XHCI_EXT_CAPS_PROTOCOL); if (!cap_start) { xhci_err(xhci, "No Extended Capability registers, unable to set up roothub\n"); return -ENODEV; } offset = cap_start; /* count extended protocol capability entries for later caching */ while (offset) { cap_count++; offset = xhci_find_next_ext_cap(base, offset, XHCI_EXT_CAPS_PROTOCOL); } xhci->ext_caps = kcalloc_node(cap_count, sizeof(*xhci->ext_caps), flags, dev_to_node(dev)); if (!xhci->ext_caps) return -ENOMEM; xhci->port_caps = kcalloc_node(cap_count, sizeof(*xhci->port_caps), flags, dev_to_node(dev)); if (!xhci->port_caps) return -ENOMEM; offset = cap_start; while (offset) { xhci_add_in_port(xhci, num_ports, base + offset, cap_count); if (xhci->usb2_rhub.num_ports + xhci->usb3_rhub.num_ports == num_ports) break; offset = xhci_find_next_ext_cap(base, offset, XHCI_EXT_CAPS_PROTOCOL); } if (xhci->usb2_rhub.num_ports == 0 && xhci->usb3_rhub.num_ports == 0) { xhci_warn(xhci, "No ports on the roothubs?\n"); return -ENODEV; } xhci_dbg_trace(xhci, trace_xhci_dbg_init, "Found %u USB 2.0 ports and %u USB 3.0 ports.", xhci->usb2_rhub.num_ports, xhci->usb3_rhub.num_ports); /* Place limits on the number of roothub ports so that the hub * descriptors aren't longer than the USB core will allocate. */ if (xhci->usb3_rhub.num_ports > USB_SS_MAXPORTS) { xhci_dbg_trace(xhci, trace_xhci_dbg_init, "Limiting USB 3.0 roothub ports to %u.", USB_SS_MAXPORTS); xhci->usb3_rhub.num_ports = USB_SS_MAXPORTS; } if (xhci->usb2_rhub.num_ports > USB_MAXCHILDREN) { xhci_dbg_trace(xhci, trace_xhci_dbg_init, "Limiting USB 2.0 roothub ports to %u.", USB_MAXCHILDREN); xhci->usb2_rhub.num_ports = USB_MAXCHILDREN; } if (!xhci->usb2_rhub.num_ports) xhci_info(xhci, "USB2 root hub has no ports\n"); if (!xhci->usb3_rhub.num_ports) xhci_info(xhci, "USB3 root hub has no ports\n"); xhci_create_rhub_port_array(xhci, &xhci->usb2_rhub, flags); xhci_create_rhub_port_array(xhci, &xhci->usb3_rhub, flags); return 0; } static struct xhci_interrupter * xhci_alloc_interrupter(struct xhci_hcd *xhci, gfp_t flags) { struct device *dev = xhci_to_hcd(xhci)->self.sysdev; struct xhci_interrupter *ir; unsigned int num_segs; int ret; ir = kzalloc_node(sizeof(*ir), flags, dev_to_node(dev)); if (!ir) return NULL; num_segs = min_t(unsigned int, 1 << HCS_ERST_MAX(xhci->hcs_params2), ERST_MAX_SEGS); ir->event_ring = xhci_ring_alloc(xhci, num_segs, 1, TYPE_EVENT, 0, flags); if (!ir->event_ring) { xhci_warn(xhci, "Failed to allocate interrupter event ring\n"); kfree(ir); return NULL; } ret = xhci_alloc_erst(xhci, ir->event_ring, &ir->erst, flags); if (ret) { xhci_warn(xhci, "Failed to allocate interrupter erst\n"); xhci_ring_free(xhci, ir->event_ring); kfree(ir); return NULL; } return ir; } static int xhci_add_interrupter(struct xhci_hcd *xhci, struct xhci_interrupter *ir, unsigned int intr_num) { u64 erst_base; u32 erst_size; if (intr_num > xhci->max_interrupters) { xhci_warn(xhci, "Can't add interrupter %d, max interrupters %d\n", intr_num, xhci->max_interrupters); return -EINVAL; } ir->ir_set = &xhci->run_regs->ir_set[intr_num]; /* set ERST count with the number of entries in the segment table */ erst_size = readl(&ir->ir_set->erst_size); erst_size &= ERST_SIZE_MASK; erst_size |= ir->event_ring->num_segs; writel(erst_size, &ir->ir_set->erst_size); erst_base = xhci_read_64(xhci, &ir->ir_set->erst_base); erst_base &= ERST_BASE_RSVDP; erst_base |= ir->erst.erst_dma_addr & ~ERST_BASE_RSVDP; xhci_write_64(xhci, erst_base, &ir->ir_set->erst_base); /* Set the event ring dequeue address of this interrupter */ xhci_set_hc_event_deq(xhci, ir); return 0; } int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags) { dma_addr_t dma; struct device *dev = xhci_to_hcd(xhci)->self.sysdev; unsigned int val, val2; u64 val_64; u32 page_size, temp; int i; INIT_LIST_HEAD(&xhci->cmd_list); /* init command timeout work */ INIT_DELAYED_WORK(&xhci->cmd_timer, xhci_handle_command_timeout); init_completion(&xhci->cmd_ring_stop_completion); page_size = readl(&xhci->op_regs->page_size); xhci_dbg_trace(xhci, trace_xhci_dbg_init, "Supported page size register = 0x%x", page_size); i = ffs(page_size); if (i < 16) xhci_dbg_trace(xhci, trace_xhci_dbg_init, "Supported page size of %iK", (1 << (i+12)) / 1024); else xhci_warn(xhci, "WARN: no supported page size\n"); /* Use 4K pages, since that's common and the minimum the HC supports */ xhci->page_shift = 12; xhci->page_size = 1 << xhci->page_shift; xhci_dbg_trace(xhci, trace_xhci_dbg_init, "HCD page size set to %iK", xhci->page_size / 1024); /* * Program the Number of Device Slots Enabled field in the CONFIG * register with the max value of slots the HC can handle. */ val = HCS_MAX_SLOTS(readl(&xhci->cap_regs->hcs_params1)); xhci_dbg_trace(xhci, trace_xhci_dbg_init, "// xHC can handle at most %d device slots.", val); val2 = readl(&xhci->op_regs->config_reg); val |= (val2 & ~HCS_SLOTS_MASK); xhci_dbg_trace(xhci, trace_xhci_dbg_init, "// Setting Max device slots reg = 0x%x.", val); writel(val, &xhci->op_regs->config_reg); /* * xHCI section 5.4.6 - Device Context array must be * "physically contiguous and 64-byte (cache line) aligned". */ xhci->dcbaa = dma_alloc_coherent(dev, sizeof(*xhci->dcbaa), &dma, flags); if (!xhci->dcbaa) goto fail; xhci->dcbaa->dma = dma; xhci_dbg_trace(xhci, trace_xhci_dbg_init, "// Device context base array address = 0x%pad (DMA), %p (virt)", &xhci->dcbaa->dma, xhci->dcbaa); xhci_write_64(xhci, dma, &xhci->op_regs->dcbaa_ptr); /* * Initialize the ring segment pool. The ring must be a contiguous * structure comprised of TRBs. The TRBs must be 16 byte aligned, * however, the command ring segment needs 64-byte aligned segments * and our use of dma addresses in the trb_address_map radix tree needs * TRB_SEGMENT_SIZE alignment, so we pick the greater alignment need. */ if (xhci->quirks & XHCI_ZHAOXIN_TRB_FETCH) xhci->segment_pool = dma_pool_create("xHCI ring segments", dev, TRB_SEGMENT_SIZE * 2, TRB_SEGMENT_SIZE * 2, xhci->page_size * 2); else xhci->segment_pool = dma_pool_create("xHCI ring segments", dev, TRB_SEGMENT_SIZE, TRB_SEGMENT_SIZE, xhci->page_size); /* See Table 46 and Note on Figure 55 */ xhci->device_pool = dma_pool_create("xHCI input/output contexts", dev, 2112, 64, xhci->page_size); 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 dma_alloc_coherent() */ 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, 1, TYPE_COMMAND, 0, flags); if (!xhci->cmd_ring) goto fail; xhci_dbg_trace(xhci, trace_xhci_dbg_init, "Allocated command ring at %p", xhci->cmd_ring); xhci_dbg_trace(xhci, trace_xhci_dbg_init, "First segment DMA is 0x%pad", &xhci->cmd_ring->first_seg->dma); /* Set the address in the Command Ring Control register */ val_64 = xhci_read_64(xhci, &xhci->op_regs->cmd_ring); val_64 = (val_64 & (u64) CMD_RING_RSVD_BITS) | (xhci->cmd_ring->first_seg->dma & (u64) ~CMD_RING_RSVD_BITS) | xhci->cmd_ring->cycle_state; xhci_dbg_trace(xhci, trace_xhci_dbg_init, "// Setting command ring address to 0x%016llx", val_64); xhci_write_64(xhci, val_64, &xhci->op_regs->cmd_ring); /* Reserve one command ring TRB for disabling LPM. * Since the USB core grabs the shared usb_bus bandwidth mutex before * disabling LPM, we only need to reserve one TRB for all devices. */ xhci->cmd_ring_reserved_trbs++; val = readl(&xhci->cap_regs->db_off); val &= DBOFF_MASK; xhci_dbg_trace(xhci, trace_xhci_dbg_init, "// Doorbell array is located at offset 0x%x from cap regs base addr", val); xhci->dba = (void __iomem *) xhci->cap_regs + val; /* Allocate and set up primary interrupter 0 with an event ring. */ xhci_dbg_trace(xhci, trace_xhci_dbg_init, "Allocating primary event ring"); xhci->interrupter = xhci_alloc_interrupter(xhci, flags); if (!xhci->interrupter) goto fail; if (xhci_add_interrupter(xhci, xhci->interrupter, 0)) goto fail; xhci->isoc_bei_interval = AVOID_BEI_INTERVAL_MAX; /* * XXX: Might need to set the Interrupter Moderation Register to * something other than the default (~1ms minimum between interrupts). * See section 5.5.1.2. */ for (i = 0; i < MAX_HC_SLOTS; i++) xhci->devs[i] = NULL; if (scratchpad_alloc(xhci, flags)) goto fail; if (xhci_setup_port_arrays(xhci, flags)) goto fail; /* Enable USB 3.0 device notifications for function remote wake, which * is necessary for allowing USB 3.0 devices to do remote wakeup from * U3 (device suspend). */ temp = readl(&xhci->op_regs->dev_notification); temp &= ~DEV_NOTE_MASK; temp |= DEV_NOTE_FWAKE; writel(temp, &xhci->op_regs->dev_notification); return 0; fail: xhci_halt(xhci); xhci_reset(xhci, XHCI_RESET_SHORT_USEC); xhci_mem_cleanup(xhci); return -ENOMEM; }