@@ -165,6 +165,21 @@ config SND_BCD2000
To compile this driver as a module, choose M here: the module
will be called snd-bcd2000.
+config QC_USB_AUDIO_OFFLOAD
+ tristate "Qualcomm Audio Offload driver"
+ depends on QCOM_QMI_HELPERS
+ select SND_PCM
+ help
+ Say Y here to enable the Qualcomm USB audio offloading feature
+
+ This module sets up the required QMI stream enable/disable
+ responses to requests generated by the audio DSP. It passes the
+ USB transfer resource references, so that the audio DSP can issue
+ USB transfers to the host controller.
+
+ To compile this driver as a module, choose M here: the module
+ will be called qc-audio-offload.
+
source "sound/usb/line6/Kconfig"
endif # SND_USB
@@ -33,5 +33,5 @@ obj-$(CONFIG_SND_USB_UA101) += snd-usbmidi-lib.o
obj-$(CONFIG_SND_USB_USX2Y) += snd-usbmidi-lib.o
obj-$(CONFIG_SND_USB_US122L) += snd-usbmidi-lib.o
-obj-$(CONFIG_SND) += misc/ usx2y/ caiaq/ 6fire/ hiface/ bcd2000/
+obj-$(CONFIG_SND) += misc/ usx2y/ caiaq/ 6fire/ hiface/ bcd2000/ qcom/
obj-$(CONFIG_SND_USB_LINE6) += line6/
new file mode 100644
@@ -0,0 +1,2 @@
+snd-usb-audio-qmi-objs := usb_audio_qmi_v01.o qc_audio_offload.o
+obj-$(CONFIG_QC_USB_AUDIO_OFFLOAD) += snd-usb-audio-qmi.o
\ No newline at end of file
new file mode 100644
@@ -0,0 +1,1810 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#include <linux/ctype.h>
+#include <linux/moduleparam.h>
+#include <linux/module.h>
+#include <linux/usb.h>
+#include <linux/init.h>
+#include <linux/usb/hcd.h>
+#include <linux/usb/xhci-sideband.h>
+#include <linux/usb/xhci-intr.h>
+#include <linux/usb/quirks.h>
+#include <linux/usb/audio.h>
+#include <linux/usb/audio-v2.h>
+#include <linux/usb/audio-v3.h>
+#include <linux/soc/qcom/qmi.h>
+#include <linux/iommu.h>
+#include <linux/dma-mapping.h>
+#include <linux/dma-map-ops.h>
+#include <sound/q6usboffload.h>
+
+#include <sound/control.h>
+#include <sound/core.h>
+#include <sound/info.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/initval.h>
+
+#include <sound/soc.h>
+#include <sound/soc-usb.h>
+#include "../usbaudio.h"
+#include "../card.h"
+#include "../endpoint.h"
+#include "../helper.h"
+#include "../pcm.h"
+#include "../format.h"
+#include "../power.h"
+#include "usb_audio_qmi_v01.h"
+
+/* Stream disable request timeout during USB device disconnect */
+#define DEV_RELEASE_WAIT_TIMEOUT 10000 /* in ms */
+
+/* Data interval calculation parameters */
+#define BUS_INTERVAL_FULL_SPEED 1000 /* in us */
+#define BUS_INTERVAL_HIGHSPEED_AND_ABOVE 125 /* in us */
+#define MAX_BINTERVAL_ISOC_EP 16
+
+#define QMI_STREAM_REQ_CARD_NUM_MASK 0xffff0000
+#define QMI_STREAM_REQ_DEV_NUM_MASK 0xff00
+#define QMI_STREAM_REQ_DIRECTION 0xff
+
+/* iommu resource parameters and management */
+#define PREPEND_SID_TO_IOVA(iova, sid) ((u64)(((u64)(iova)) | \
+ (((u64)sid) << 32)))
+#define IOVA_BASE 0x1000
+#define IOVA_XFER_RING_BASE (IOVA_BASE + PAGE_SIZE * (SNDRV_CARDS + 1))
+#define IOVA_XFER_BUF_BASE (IOVA_XFER_RING_BASE + PAGE_SIZE * SNDRV_CARDS * 32)
+#define IOVA_XFER_RING_MAX (IOVA_XFER_BUF_BASE - PAGE_SIZE)
+#define IOVA_XFER_BUF_MAX (0xfffff000 - PAGE_SIZE)
+
+#define MAX_XFER_BUFF_LEN (24 * PAGE_SIZE)
+
+struct iova_info {
+ struct list_head list;
+ unsigned long start_iova;
+ size_t size;
+ bool in_use;
+};
+
+struct intf_info {
+ unsigned long data_xfer_ring_va;
+ size_t data_xfer_ring_size;
+ unsigned long sync_xfer_ring_va;
+ size_t sync_xfer_ring_size;
+ unsigned long xfer_buf_va;
+ size_t xfer_buf_size;
+ phys_addr_t xfer_buf_pa;
+ unsigned int data_ep_pipe;
+ unsigned int sync_ep_pipe;
+ u8 *xfer_buf;
+ u8 intf_num;
+ u8 pcm_card_num;
+ u8 pcm_dev_num;
+ u8 direction;
+ bool in_use;
+};
+
+struct uaudio_qmi_dev {
+ struct device *dev;
+ u32 sid;
+ u32 intr_num;
+ struct xhci_interrupter *ir;
+ struct xhci_ring *sec_ring;
+ struct iommu_domain *domain;
+
+ /* list to keep track of available iova */
+ struct list_head xfer_ring_list;
+ size_t xfer_ring_iova_size;
+ unsigned long curr_xfer_ring_iova;
+ struct list_head xfer_buf_list;
+ size_t xfer_buf_iova_size;
+ unsigned long curr_xfer_buf_iova;
+
+ /* bit fields representing pcm card enabled */
+ unsigned long card_slot;
+ /* indicate event ring mapped or not */
+ bool er_mapped;
+ /* reference count to number of possible consumers */
+ atomic_t qdev_in_use;
+ /* idx to last udev card number plugged in */
+ unsigned int last_card_num;
+};
+
+struct uaudio_dev {
+ struct usb_device *udev;
+ /* audio control interface */
+ struct usb_host_interface *ctrl_intf;
+ unsigned int usb_core_id;
+ atomic_t in_use;
+ struct kref kref;
+ wait_queue_head_t disconnect_wq;
+
+ /* interface specific */
+ int num_intf;
+ struct intf_info *info;
+ struct snd_usb_audio *chip;
+
+ /* xhci sideband */
+ struct xhci_sideband *sb;
+};
+
+static struct uaudio_dev uadev[SNDRV_CARDS];
+static struct uaudio_qmi_dev *uaudio_qdev;
+static struct uaudio_qmi_svc *uaudio_svc;
+static DEFINE_MUTEX(qdev_mutex);
+
+struct uaudio_qmi_svc {
+ struct qmi_handle *uaudio_svc_hdl;
+ struct work_struct qmi_disconnect_work;
+ struct workqueue_struct *uaudio_wq;
+ struct sockaddr_qrtr client_sq;
+ bool client_connected;
+};
+
+enum mem_type {
+ MEM_EVENT_RING,
+ MEM_XFER_RING,
+ MEM_XFER_BUF,
+};
+
+/* Supported audio formats */
+enum usb_qmi_audio_format {
+ USB_QMI_PCM_FORMAT_S8 = 0,
+ USB_QMI_PCM_FORMAT_U8,
+ USB_QMI_PCM_FORMAT_S16_LE,
+ USB_QMI_PCM_FORMAT_S16_BE,
+ USB_QMI_PCM_FORMAT_U16_LE,
+ USB_QMI_PCM_FORMAT_U16_BE,
+ USB_QMI_PCM_FORMAT_S24_LE,
+ USB_QMI_PCM_FORMAT_S24_BE,
+ USB_QMI_PCM_FORMAT_U24_LE,
+ USB_QMI_PCM_FORMAT_U24_BE,
+ USB_QMI_PCM_FORMAT_S24_3LE,
+ USB_QMI_PCM_FORMAT_S24_3BE,
+ USB_QMI_PCM_FORMAT_U24_3LE,
+ USB_QMI_PCM_FORMAT_U24_3BE,
+ USB_QMI_PCM_FORMAT_S32_LE,
+ USB_QMI_PCM_FORMAT_S32_BE,
+ USB_QMI_PCM_FORMAT_U32_LE,
+ USB_QMI_PCM_FORMAT_U32_BE,
+};
+
+static enum usb_qmi_audio_device_speed_enum_v01
+get_speed_info(enum usb_device_speed udev_speed)
+{
+ switch (udev_speed) {
+ case USB_SPEED_LOW:
+ return USB_QMI_DEVICE_SPEED_LOW_V01;
+ case USB_SPEED_FULL:
+ return USB_QMI_DEVICE_SPEED_FULL_V01;
+ case USB_SPEED_HIGH:
+ return USB_QMI_DEVICE_SPEED_HIGH_V01;
+ case USB_SPEED_SUPER:
+ return USB_QMI_DEVICE_SPEED_SUPER_V01;
+ case USB_SPEED_SUPER_PLUS:
+ return USB_QMI_DEVICE_SPEED_SUPER_PLUS_V01;
+ default:
+ return USB_QMI_DEVICE_SPEED_INVALID_V01;
+ }
+}
+
+static struct snd_usb_substream *find_substream(unsigned int card_num,
+ unsigned int pcm_idx, unsigned int direction)
+{
+ struct snd_usb_stream *as;
+ struct snd_usb_substream *subs = NULL;
+ struct snd_usb_audio *chip;
+
+ chip = uadev[card_num].chip;
+ if (!chip || atomic_read(&chip->shutdown))
+ goto done;
+
+ if (pcm_idx >= chip->pcm_devs)
+ goto done;
+
+ if (direction > SNDRV_PCM_STREAM_CAPTURE)
+ goto done;
+
+ list_for_each_entry(as, &chip->pcm_list, list) {
+ if (as->pcm_index == pcm_idx) {
+ subs = &as->substream[direction];
+ goto done;
+ }
+ }
+
+done:
+ return subs;
+}
+
+static int info_idx_from_ifnum(int card_num, int intf_num, bool enable)
+{
+ int i;
+
+ /*
+ * default index 0 is used when info is allocated upon
+ * first enable audio stream req for a pcm device
+ */
+ if (enable && !uadev[card_num].info)
+ return 0;
+
+ for (i = 0; i < uadev[card_num].num_intf; i++) {
+ if (enable && !uadev[card_num].info[i].in_use)
+ return i;
+ else if (!enable &&
+ uadev[card_num].info[i].intf_num == intf_num)
+ return i;
+ }
+
+ return -EINVAL;
+}
+
+static int get_data_interval_from_si(struct snd_usb_substream *subs,
+ u32 service_interval)
+{
+ unsigned int bus_intval, bus_intval_mult, binterval;
+
+ if (subs->dev->speed >= USB_SPEED_HIGH)
+ bus_intval = BUS_INTERVAL_HIGHSPEED_AND_ABOVE;
+ else
+ bus_intval = BUS_INTERVAL_FULL_SPEED;
+
+ if (service_interval % bus_intval)
+ return -EINVAL;
+
+ bus_intval_mult = service_interval / bus_intval;
+ binterval = ffs(bus_intval_mult);
+ if (!binterval || binterval > MAX_BINTERVAL_ISOC_EP)
+ return -EINVAL;
+
+ /* check if another bit is set then bail out */
+ bus_intval_mult = bus_intval_mult >> binterval;
+ if (bus_intval_mult)
+ return -EINVAL;
+
+ return (binterval - 1);
+}
+
+/* maps audio format received over QMI to asound.h based pcm format */
+static snd_pcm_format_t map_pcm_format(enum usb_qmi_audio_format fmt_received)
+{
+ switch (fmt_received) {
+ case USB_QMI_PCM_FORMAT_S8:
+ return SNDRV_PCM_FORMAT_S8;
+ case USB_QMI_PCM_FORMAT_U8:
+ return SNDRV_PCM_FORMAT_U8;
+ case USB_QMI_PCM_FORMAT_S16_LE:
+ return SNDRV_PCM_FORMAT_S16_LE;
+ case USB_QMI_PCM_FORMAT_S16_BE:
+ return SNDRV_PCM_FORMAT_S16_BE;
+ case USB_QMI_PCM_FORMAT_U16_LE:
+ return SNDRV_PCM_FORMAT_U16_LE;
+ case USB_QMI_PCM_FORMAT_U16_BE:
+ return SNDRV_PCM_FORMAT_U16_BE;
+ case USB_QMI_PCM_FORMAT_S24_LE:
+ return SNDRV_PCM_FORMAT_S24_LE;
+ case USB_QMI_PCM_FORMAT_S24_BE:
+ return SNDRV_PCM_FORMAT_S24_BE;
+ case USB_QMI_PCM_FORMAT_U24_LE:
+ return SNDRV_PCM_FORMAT_U24_LE;
+ case USB_QMI_PCM_FORMAT_U24_BE:
+ return SNDRV_PCM_FORMAT_U24_BE;
+ case USB_QMI_PCM_FORMAT_S24_3LE:
+ return SNDRV_PCM_FORMAT_S24_3LE;
+ case USB_QMI_PCM_FORMAT_S24_3BE:
+ return SNDRV_PCM_FORMAT_S24_3BE;
+ case USB_QMI_PCM_FORMAT_U24_3LE:
+ return SNDRV_PCM_FORMAT_U24_3LE;
+ case USB_QMI_PCM_FORMAT_U24_3BE:
+ return SNDRV_PCM_FORMAT_U24_3BE;
+ case USB_QMI_PCM_FORMAT_S32_LE:
+ return SNDRV_PCM_FORMAT_S32_LE;
+ case USB_QMI_PCM_FORMAT_S32_BE:
+ return SNDRV_PCM_FORMAT_S32_BE;
+ case USB_QMI_PCM_FORMAT_U32_LE:
+ return SNDRV_PCM_FORMAT_U32_LE;
+ case USB_QMI_PCM_FORMAT_U32_BE:
+ return SNDRV_PCM_FORMAT_U32_BE;
+ default:
+ /*
+ * We expect the caller to do input validation so we should
+ * never hit this. But we do have to return a proper
+ * snd_pcm_format_t value due to the __bitwise attribute; so
+ * just return the equivalent of 0 in case of bad input.
+ */
+ return SNDRV_PCM_FORMAT_S8;
+ }
+}
+
+/* Offloading IOMMU management */
+static unsigned long uaudio_get_iova(unsigned long *curr_iova,
+ size_t *curr_iova_size, struct list_head *head, size_t size)
+{
+ struct iova_info *info, *new_info = NULL;
+ struct list_head *curr_head;
+ unsigned long va = 0;
+ size_t tmp_size = size;
+ bool found = false;
+
+ if (size % PAGE_SIZE) {
+ dev_err(uaudio_qdev->dev, "size %zu is not page size multiple\n",
+ size);
+ goto done;
+ }
+
+ if (size > *curr_iova_size) {
+ dev_err(uaudio_qdev->dev, "size %zu > curr size %zu\n",
+ size, *curr_iova_size);
+ goto done;
+ }
+ if (*curr_iova_size == 0) {
+ dev_err(uaudio_qdev->dev, "iova mapping is full\n");
+ goto done;
+ }
+
+ list_for_each_entry(info, head, list) {
+ /* exact size iova_info */
+ if (!info->in_use && info->size == size) {
+ info->in_use = true;
+ va = info->start_iova;
+ *curr_iova_size -= size;
+ found = true;
+ dev_dbg(uaudio_qdev->dev, "exact size: %zu found\n", size);
+ goto done;
+ } else if (!info->in_use && tmp_size >= info->size) {
+ if (!new_info)
+ new_info = info;
+ dev_dbg(uaudio_qdev->dev, "partial size: %zu found\n",
+ info->size);
+ tmp_size -= info->size;
+ if (tmp_size)
+ continue;
+
+ va = new_info->start_iova;
+ for (curr_head = &new_info->list; curr_head !=
+ &info->list; curr_head = curr_head->next) {
+ new_info = list_entry(curr_head, struct
+ iova_info, list);
+ new_info->in_use = true;
+ }
+ info->in_use = true;
+ *curr_iova_size -= size;
+ found = true;
+ goto done;
+ } else {
+ /* iova region in use */
+ new_info = NULL;
+ tmp_size = size;
+ }
+ }
+
+ info = kzalloc(sizeof(struct iova_info), GFP_KERNEL);
+ if (!info) {
+ va = 0;
+ goto done;
+ }
+
+ va = info->start_iova = *curr_iova;
+ info->size = size;
+ info->in_use = true;
+ *curr_iova += size;
+ *curr_iova_size -= size;
+ found = true;
+ list_add_tail(&info->list, head);
+
+done:
+ if (!found)
+ dev_err(uaudio_qdev->dev, "unable to find %zu size iova\n",
+ size);
+ else
+ dev_dbg(uaudio_qdev->dev,
+ "va:0x%08lx curr_iova:0x%08lx curr_iova_size:%zu\n",
+ va, *curr_iova, *curr_iova_size);
+
+ return va;
+}
+
+static void uaudio_put_iova(unsigned long va, size_t size, struct list_head
+ *head, size_t *curr_iova_size)
+{
+ struct iova_info *info;
+ size_t tmp_size = size;
+ bool found = false;
+
+ list_for_each_entry(info, head, list) {
+ if (info->start_iova == va) {
+ if (!info->in_use) {
+ dev_err(uaudio_qdev->dev, "va %lu is not in use\n",
+ va);
+ return;
+ }
+ found = true;
+ info->in_use = false;
+ if (info->size == size)
+ goto done;
+ }
+
+ if (found && tmp_size >= info->size) {
+ info->in_use = false;
+ tmp_size -= info->size;
+ if (!tmp_size)
+ goto done;
+ }
+ }
+
+ if (!found) {
+ dev_err(uaudio_qdev->dev, "unable to find the va %lu\n", va);
+ return;
+ }
+done:
+ *curr_iova_size += size;
+ dev_dbg(uaudio_qdev->dev, "curr_iova_size %zu\n", *curr_iova_size);
+}
+
+/**
+ * uaudio_iommu_unmap() - unmaps iommu memory for adsp
+ * @mtype: ring type
+ * @va: virtual address to unmap
+ * @iova_size: region size
+ * @mapped_iova_size: mapped region size
+ *
+ * Unmaps the memory region that was previously assigned to the adsp.
+ *
+ */
+static void uaudio_iommu_unmap(enum mem_type mtype, unsigned long va,
+ size_t iova_size, size_t mapped_iova_size)
+{
+ size_t umap_size;
+ bool unmap = true;
+
+ if (!va || !iova_size)
+ return;
+
+ switch (mtype) {
+ case MEM_EVENT_RING:
+ if (uaudio_qdev->er_mapped)
+ uaudio_qdev->er_mapped = false;
+ else
+ unmap = false;
+ break;
+
+ case MEM_XFER_RING:
+ uaudio_put_iova(va, iova_size, &uaudio_qdev->xfer_ring_list,
+ &uaudio_qdev->xfer_ring_iova_size);
+ break;
+ case MEM_XFER_BUF:
+ uaudio_put_iova(va, iova_size, &uaudio_qdev->xfer_buf_list,
+ &uaudio_qdev->xfer_buf_iova_size);
+ break;
+ default:
+ dev_err(uaudio_qdev->dev, "unknown mem type %d\n", mtype);
+ unmap = false;
+ }
+
+ if (!unmap || !mapped_iova_size)
+ return;
+
+ dev_dbg(uaudio_qdev->dev, "type %d: unmap iova 0x%08lx size %zu\n",
+ mtype, va, mapped_iova_size);
+
+ umap_size = iommu_unmap(uaudio_qdev->domain, va, mapped_iova_size);
+ if (umap_size != mapped_iova_size)
+ dev_err(uaudio_qdev->dev,
+ "unmapped size %zu for iova 0x%08lx of mapped size %zu\n",
+ umap_size, va, mapped_iova_size);
+}
+
+/**
+ * uaudio_iommu_map() - maps iommu memory for adsp
+ * @mtype: ring type
+ * @dma_coherent: dma coherent
+ * @pa: physical address for ring/buffer
+ * @size: size of memory region
+ * @sgt: sg table for memory region
+ *
+ * Maps the XHCI related resources to a memory region that is assigned to be
+ * used by the adsp. This will be mapped to the domain, which is created by
+ * the ASoC USB backend driver.
+ *
+ */
+static unsigned long uaudio_iommu_map(enum mem_type mtype, bool dma_coherent,
+ phys_addr_t pa, size_t size, struct sg_table *sgt)
+{
+ unsigned long va_sg, va = 0;
+ bool map = true;
+ int i, ret;
+ size_t sg_len, total_len = 0;
+ struct scatterlist *sg;
+ phys_addr_t pa_sg;
+ int prot = IOMMU_READ | IOMMU_WRITE;
+
+ if (dma_coherent)
+ prot |= IOMMU_CACHE;
+
+ switch (mtype) {
+ case MEM_EVENT_RING:
+ va = IOVA_BASE;
+ /* er already mapped */
+ if (uaudio_qdev->er_mapped)
+ map = false;
+ break;
+ case MEM_XFER_RING:
+ va = uaudio_get_iova(&uaudio_qdev->curr_xfer_ring_iova,
+ &uaudio_qdev->xfer_ring_iova_size, &uaudio_qdev->xfer_ring_list,
+ size);
+ break;
+ case MEM_XFER_BUF:
+ va = uaudio_get_iova(&uaudio_qdev->curr_xfer_buf_iova,
+ &uaudio_qdev->xfer_buf_iova_size, &uaudio_qdev->xfer_buf_list,
+ size);
+ break;
+ default:
+ dev_err(uaudio_qdev->dev, "unknown mem type %d\n", mtype);
+ }
+
+ if (!va || !map)
+ goto done;
+
+ if (!sgt)
+ goto skip_sgt_map;
+
+ va_sg = va;
+ for_each_sg(sgt->sgl, sg, sgt->nents, i) {
+ sg_len = PAGE_ALIGN(sg->offset + sg->length);
+ pa_sg = page_to_phys(sg_page(sg));
+ ret = iommu_map(uaudio_qdev->domain, va_sg, pa_sg, sg_len,
+ prot, GFP_KERNEL);
+ if (ret) {
+ dev_err(uaudio_qdev->dev, "mapping failed ret%d\n", ret);
+ dev_err(uaudio_qdev->dev,
+ "type:%d, pa:%pa iova:0x%08lx sg_len:%zu\n",
+ mtype, &pa_sg, va_sg, sg_len);
+ uaudio_iommu_unmap(MEM_XFER_BUF, va, size, total_len);
+ va = 0;
+ goto done;
+ }
+ dev_dbg(uaudio_qdev->dev,
+ "type:%d map pa:%pa to iova:0x%08lx len:%zu offset:%u\n",
+ mtype, &pa_sg, va_sg, sg_len, sg->offset);
+ va_sg += sg_len;
+ total_len += sg_len;
+ }
+
+ if (size != total_len) {
+ dev_err(uaudio_qdev->dev, "iova size %zu != mapped iova size %zu\n",
+ size, total_len);
+ uaudio_iommu_unmap(MEM_XFER_BUF, va, size, total_len);
+ va = 0;
+ }
+ return va;
+
+skip_sgt_map:
+ dev_dbg(uaudio_qdev->dev, "type:%d map pa:%pa to iova:0x%08lx size:%zu\n",
+ mtype, &pa, va, size);
+
+ ret = iommu_map(uaudio_qdev->domain, va, pa, size, prot, GFP_KERNEL);
+ if (ret)
+ dev_err(uaudio_qdev->dev,
+ "failed to map pa:%pa iova:0x%lx type:%d ret:%d\n",
+ &pa, va, mtype, ret);
+done:
+ return va;
+}
+
+/* looks up alias, if any, for controller DT node and returns the index */
+static int usb_get_controller_id(struct usb_device *udev)
+{
+ if (udev->bus->sysdev && udev->bus->sysdev->of_node)
+ return of_alias_get_id(udev->bus->sysdev->of_node, "usb");
+
+ return -ENODEV;
+}
+
+/**
+ * uaudio_dev_intf_cleanup() - cleanup transfer resources
+ * @udev: usb device
+ * @info: usb offloading interface
+ *
+ * Cleans up the transfer ring related resources which are assigned per
+ * endpoint from XHCI. This is invoked when the USB endpoints are no
+ * longer in use by the adsp.
+ *
+ */
+static void uaudio_dev_intf_cleanup(struct usb_device *udev,
+ struct intf_info *info)
+{
+ uaudio_iommu_unmap(MEM_XFER_RING, info->data_xfer_ring_va,
+ info->data_xfer_ring_size, info->data_xfer_ring_size);
+ info->data_xfer_ring_va = 0;
+ info->data_xfer_ring_size = 0;
+
+ uaudio_iommu_unmap(MEM_XFER_RING, info->sync_xfer_ring_va,
+ info->sync_xfer_ring_size, info->sync_xfer_ring_size);
+ info->sync_xfer_ring_va = 0;
+ info->sync_xfer_ring_size = 0;
+
+ uaudio_iommu_unmap(MEM_XFER_BUF, info->xfer_buf_va,
+ info->xfer_buf_size, info->xfer_buf_size);
+ info->xfer_buf_va = 0;
+
+ usb_free_coherent(udev, info->xfer_buf_size,
+ info->xfer_buf, info->xfer_buf_pa);
+ info->xfer_buf_size = 0;
+ info->xfer_buf = NULL;
+ info->xfer_buf_pa = 0;
+
+ info->in_use = false;
+}
+
+/**
+ * uaudio_event_ring_cleanup_free() - cleanup secondary event ring
+ * @dev: usb offload device
+ *
+ * Cleans up the secondary event ring that was requested. This will
+ * occur when the adsp is no longer transferring data on the USB bus
+ * across all endpoints.
+ *
+ */
+static void uaudio_event_ring_cleanup_free(struct uaudio_dev *dev)
+{
+ struct usb_hcd *hcd = bus_to_hcd(dev->udev->bus);
+
+ clear_bit(dev->chip->card->number, &uaudio_qdev->card_slot);
+ /* all audio devices are disconnected */
+ if (!uaudio_qdev->card_slot) {
+ uaudio_iommu_unmap(MEM_EVENT_RING, IOVA_BASE, PAGE_SIZE,
+ PAGE_SIZE);
+ xhci_remove_secondary_interrupter(hcd, uaudio_qdev->ir);
+ uaudio_qdev->ir = NULL;
+ }
+}
+
+static void uaudio_dev_cleanup(struct uaudio_dev *dev)
+{
+ int if_idx;
+
+ if (!dev->udev)
+ return;
+
+ /* free xfer buffer and unmap xfer ring and buf per interface */
+ for (if_idx = 0; if_idx < dev->num_intf; if_idx++) {
+ if (!dev->info[if_idx].in_use)
+ continue;
+ uaudio_dev_intf_cleanup(dev->udev, &dev->info[if_idx]);
+ dev_dbg(uaudio_qdev->dev, "release resources: intf# %d card# %d\n",
+ dev->info[if_idx].intf_num, dev->chip->card->number);
+ }
+
+ dev->num_intf = 0;
+
+ /* free interface info */
+ kfree(dev->info);
+ dev->info = NULL;
+ uaudio_event_ring_cleanup_free(dev);
+ dev->udev = NULL;
+}
+
+/**
+ * disable_audio_stream() - disable usb snd endpoints
+ * @subs: usb substream
+ *
+ * Closes the USB SND endpoints associated with the current audio stream
+ * used. This will decrement the USB SND endpoint opened reference count.
+ *
+ */
+static void disable_audio_stream(struct snd_usb_substream *subs)
+{
+ struct snd_usb_audio *chip = subs->stream->chip;
+
+ if (subs->data_endpoint || subs->sync_endpoint) {
+ close_endpoints(chip, subs);
+
+ mutex_lock(&chip->mutex);
+ subs->cur_audiofmt = NULL;
+ mutex_unlock(&chip->mutex);
+ }
+
+ snd_usb_autosuspend(chip);
+}
+
+/* QMI service disconnect handlers */
+static void qmi_disconnect_work(struct work_struct *w)
+{
+ struct intf_info *info;
+ int idx, if_idx;
+ struct snd_usb_substream *subs;
+ struct snd_usb_audio *chip;
+
+ /* find all active intf for set alt 0 and cleanup usb audio dev */
+ for (idx = 0; idx < SNDRV_CARDS; idx++) {
+ if (!atomic_read(&uadev[idx].in_use))
+ continue;
+
+ chip = uadev[idx].chip;
+ for (if_idx = 0; if_idx < uadev[idx].num_intf; if_idx++) {
+ if (!uadev[idx].info || !uadev[idx].info[if_idx].in_use)
+ continue;
+ info = &uadev[idx].info[if_idx];
+ subs = find_substream(info->pcm_card_num,
+ info->pcm_dev_num,
+ info->direction);
+ if (!subs || !chip || atomic_read(&chip->shutdown)) {
+ dev_err(&subs->dev->dev,
+ "no sub for c#%u dev#%u dir%u\n",
+ info->pcm_card_num,
+ info->pcm_dev_num,
+ info->direction);
+ continue;
+ }
+ disable_audio_stream(subs);
+ }
+ atomic_set(&uadev[idx].in_use, 0);
+ mutex_lock(&chip->mutex);
+ uaudio_dev_cleanup(&uadev[idx]);
+ mutex_unlock(&chip->mutex);
+ }
+}
+
+/**
+ * qmi_bye_cb() - qmi bye message callback
+ * @handle: QMI handle
+ * @node: id of the dying node
+ *
+ * This callback is invoked when the QMI bye control message is received
+ * from the QMI client. Handle the message accordingly by ensuring that
+ * the USB offload path is disabled and cleaned up. At this point, ADSP
+ * is not utilizing the USB bus.
+ *
+ */
+static void qmi_bye_cb(struct qmi_handle *handle, unsigned int node)
+{
+ struct uaudio_qmi_svc *svc = uaudio_svc;
+
+ if (svc->uaudio_svc_hdl != handle)
+ return;
+
+ if (svc->client_connected && svc->client_sq.sq_node == node) {
+ queue_work(svc->uaudio_wq, &svc->qmi_disconnect_work);
+ svc->client_sq.sq_node = 0;
+ svc->client_sq.sq_port = 0;
+ svc->client_sq.sq_family = 0;
+ svc->client_connected = false;
+ }
+}
+
+/**
+ * qmi_svc_disconnect_cb() - qmi client disconnected
+ * @handle: QMI handle
+ * @node: id of the dying node
+ * @port: port of the dying client
+ *
+ * Invoked when the remote QMI client is disconnected. Handle this event
+ * the same way as when the QMI bye message is received. This will ensure
+ * the USB offloading path is disabled and cleaned up.
+ *
+ */
+static void qmi_svc_disconnect_cb(struct qmi_handle *handle,
+ unsigned int node, unsigned int port)
+{
+ struct uaudio_qmi_svc *svc;
+
+ if (uaudio_svc == NULL)
+ return;
+
+ svc = uaudio_svc;
+ if (svc->uaudio_svc_hdl != handle)
+ return;
+
+ if (svc->client_connected && svc->client_sq.sq_node == node &&
+ svc->client_sq.sq_port == port) {
+ queue_work(svc->uaudio_wq, &svc->qmi_disconnect_work);
+ svc->client_sq.sq_node = 0;
+ svc->client_sq.sq_port = 0;
+ svc->client_sq.sq_family = 0;
+ svc->client_connected = false;
+ }
+}
+
+/* QMI client callback handlers from QMI interface */
+static struct qmi_ops uaudio_svc_ops_options = {
+ .bye = qmi_bye_cb,
+ .del_client = qmi_svc_disconnect_cb,
+};
+
+/* kref release callback when all streams are disabled */
+static void uaudio_dev_release(struct kref *kref)
+{
+ struct uaudio_dev *dev = container_of(kref, struct uaudio_dev, kref);
+
+ uaudio_event_ring_cleanup_free(dev);
+ atomic_set(&dev->in_use, 0);
+ wake_up(&dev->disconnect_wq);
+}
+
+/**
+ * enable_audio_stream() - enable usb snd endpoints
+ * @subs: usb substream
+ * @pcm_format: pcm format requested
+ * @channels: number of channels
+ * @cur_rate: sample rate
+ * @datainterval: interval
+ *
+ * Opens all USB SND endpoints used for the data interface. This will increment
+ * the USB SND endpoint's opened count. Requests to keep the interface resumed
+ * until the audio stream is stopped. Will issue the USB set interface control
+ * message to enable the data interface.
+ *
+ */
+static int enable_audio_stream(struct snd_usb_substream *subs,
+ snd_pcm_format_t pcm_format,
+ unsigned int channels, unsigned int cur_rate,
+ int datainterval)
+{
+ struct snd_usb_audio *chip = subs->stream->chip;
+ struct snd_pcm_hw_params params;
+ struct snd_mask *m;
+ struct snd_interval *i;
+ const struct audioformat *fmt;
+ int ret;
+ bool fixed_rate;
+
+ _snd_pcm_hw_params_any(¶ms);
+
+ m = hw_param_mask(¶ms, SNDRV_PCM_HW_PARAM_FORMAT);
+ snd_mask_leave(m, pcm_format);
+
+ i = hw_param_interval(¶ms, SNDRV_PCM_HW_PARAM_CHANNELS);
+ snd_interval_setinteger(i);
+
+ i = hw_param_interval(¶ms, SNDRV_PCM_HW_PARAM_RATE);
+ snd_interval_setinteger(i);
+ i->min = i->max = cur_rate;
+
+ pm_runtime_barrier(&chip->intf[0]->dev);
+ snd_usb_autoresume(chip);
+
+ fmt = find_format(&subs->fmt_list, pcm_format, cur_rate,
+ channels, datainterval, subs);
+ if (!fmt) {
+ dev_err(uaudio_qdev->dev,
+ "cannot find format: format = %#x, rate = %d, ch = %d\n",
+ pcm_format, cur_rate, channels);
+ return -EINVAL;
+ }
+
+ if (atomic_read(&chip->shutdown)) {
+ dev_err(uaudio_qdev->dev, "chip already shutdown\n");
+ ret = -ENODEV;
+ } else {
+ if (subs->data_endpoint)
+ close_endpoints(chip, subs);
+
+ fixed_rate = snd_usb_pcm_has_fixed_rate(subs);
+ subs->data_endpoint = snd_usb_endpoint_open(chip, fmt,
+ ¶ms, false, fixed_rate);
+ if (!subs->data_endpoint) {
+ dev_err(uaudio_qdev->dev, "failed to open data endpoint\n");
+ return -EINVAL;
+ }
+
+ if (fmt->sync_ep) {
+ subs->sync_endpoint = snd_usb_endpoint_open(chip,
+ fmt, ¶ms, true, fixed_rate);
+ if (!subs->sync_endpoint) {
+ dev_err(uaudio_qdev->dev,
+ "failed to open sync endpoint\n");
+ return -EINVAL;
+ }
+
+ subs->data_endpoint->sync_source = subs->sync_endpoint;
+ }
+
+ mutex_lock(&chip->mutex);
+ subs->cur_audiofmt = fmt;
+ mutex_unlock(&chip->mutex);
+
+ if (subs->sync_endpoint) {
+ ret = snd_usb_endpoint_prepare(chip, subs->sync_endpoint);
+ if (ret < 0)
+ return ret;
+ }
+
+ ret = snd_usb_endpoint_prepare(chip, subs->data_endpoint);
+ if (ret < 0)
+ return ret;
+
+ dev_dbg(uaudio_qdev->dev,
+ "selected %s iface:%d altsetting:%d datainterval:%dus\n",
+ subs->direction ? "capture" : "playback",
+ fmt->iface, fmt->altsetting,
+ (1 << fmt->datainterval) *
+ (subs->dev->speed >= USB_SPEED_HIGH ?
+ BUS_INTERVAL_HIGHSPEED_AND_ABOVE :
+ BUS_INTERVAL_FULL_SPEED));
+ }
+
+ return 0;
+}
+
+/* returns usb hcd sysdev */
+static struct device *usb_get_usb_backend(struct usb_device *udev)
+{
+ if (udev->bus->sysdev && udev->bus->sysdev->of_node)
+ return udev->bus->sysdev;
+
+ return NULL;
+}
+
+/**
+ * prepare_qmi_response() - prepare stream enable response
+ * @subs: usb substream
+ * @req_msg: QMI request message
+ * @resp: QMI response buffer
+ * @info_idx: usb interface array index
+ *
+ * Prepares the QMI response for a USB QMI stream enable request. Will parse
+ * out the parameters within the stream enable request, in order to match
+ * requested audio profile to the ones exposed by the USB device connected.
+ *
+ * In addition, will fetch the XHCI transfer resources needed for the handoff to
+ * happen. This includes, transfer ring and buffer addresses and secondary event
+ * ring address. These parameters will be communicated as part of the USB QMI
+ * stream enable response.
+ *
+ */
+static int prepare_qmi_response(struct snd_usb_substream *subs,
+ struct qmi_uaudio_stream_req_msg_v01 *req_msg,
+ struct qmi_uaudio_stream_resp_msg_v01 *resp, int info_idx)
+{
+ struct usb_interface *iface;
+ struct usb_host_interface *alts;
+ struct usb_interface_descriptor *altsd;
+ struct usb_interface_assoc_descriptor *assoc;
+ struct usb_host_endpoint *ep;
+ struct uac_format_type_i_continuous_descriptor *fmt;
+ struct uac_format_type_i_discrete_descriptor *fmt_v1;
+ struct uac_format_type_i_ext_descriptor *fmt_v2;
+ struct uac1_as_header_descriptor *as;
+ struct xhci_interrupter *ir;
+ struct q6usb_offload *data;
+ struct usb_hcd *hcd;
+ int ret;
+ int protocol, card_num, pcm_dev_num;
+ void *hdr_ptr;
+ u8 *xfer_buf;
+ unsigned int data_ep_pipe = 0, sync_ep_pipe = 0;
+ u32 len, mult, remainder, xfer_buf_len;
+ unsigned long va, tr_data_va = 0, tr_sync_va = 0;
+ phys_addr_t xhci_pa, xfer_buf_pa, tr_data_pa = 0, tr_sync_pa = 0;
+ struct sg_table sgt;
+ struct page *pg;
+ bool dma_coherent;
+
+ iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
+ if (!iface) {
+ dev_err(uaudio_qdev->dev, "interface # %d does not exist\n",
+ subs->cur_audiofmt->iface);
+ ret = -ENODEV;
+ goto err;
+ }
+
+ assoc = iface->intf_assoc;
+ pcm_dev_num = (req_msg->usb_token & QMI_STREAM_REQ_DEV_NUM_MASK) >> 8;
+ xfer_buf_len = req_msg->xfer_buff_size;
+ card_num = uaudio_qdev->last_card_num;
+
+ alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
+ altsd = get_iface_desc(alts);
+ protocol = altsd->bInterfaceProtocol;
+
+ /* get format type */
+ if (protocol != UAC_VERSION_3) {
+ fmt = snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL,
+ UAC_FORMAT_TYPE);
+ if (!fmt) {
+ dev_err(uaudio_qdev->dev,
+ "%u:%d : no UAC_FORMAT_TYPE desc\n",
+ subs->cur_audiofmt->iface,
+ subs->cur_audiofmt->altset_idx);
+ ret = -ENODEV;
+ goto err;
+ }
+ }
+
+ if (!uadev[card_num].ctrl_intf) {
+ dev_err(uaudio_qdev->dev, "audio ctrl intf info not cached\n");
+ ret = -ENODEV;
+ goto err;
+ }
+
+ if (protocol != UAC_VERSION_3) {
+ hdr_ptr = snd_usb_find_csint_desc(uadev[card_num].ctrl_intf->extra,
+ uadev[card_num].ctrl_intf->extralen, NULL,
+ UAC_HEADER);
+ if (!hdr_ptr) {
+ dev_err(uaudio_qdev->dev, "no UAC_HEADER desc\n");
+ ret = -ENODEV;
+ goto err;
+ }
+ }
+
+ if (protocol == UAC_VERSION_1) {
+ struct uac1_ac_header_descriptor *uac1_hdr = hdr_ptr;
+
+ as = snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL,
+ UAC_AS_GENERAL);
+ if (!as) {
+ dev_err(uaudio_qdev->dev,
+ "%u:%d : no UAC_AS_GENERAL desc\n",
+ subs->cur_audiofmt->iface,
+ subs->cur_audiofmt->altset_idx);
+ ret = -ENODEV;
+ goto err;
+ }
+ resp->data_path_delay = as->bDelay;
+ resp->data_path_delay_valid = 1;
+ fmt_v1 = (struct uac_format_type_i_discrete_descriptor *)fmt;
+ resp->usb_audio_subslot_size = fmt_v1->bSubframeSize;
+ resp->usb_audio_subslot_size_valid = 1;
+
+ resp->usb_audio_spec_revision = le16_to_cpu(uac1_hdr->bcdADC);
+ resp->usb_audio_spec_revision_valid = 1;
+ } else if (protocol == UAC_VERSION_2) {
+ struct uac2_ac_header_descriptor *uac2_hdr = hdr_ptr;
+
+ fmt_v2 = (struct uac_format_type_i_ext_descriptor *)fmt;
+ resp->usb_audio_subslot_size = fmt_v2->bSubslotSize;
+ resp->usb_audio_subslot_size_valid = 1;
+
+ resp->usb_audio_spec_revision = le16_to_cpu(uac2_hdr->bcdADC);
+ resp->usb_audio_spec_revision_valid = 1;
+ } else if (protocol == UAC_VERSION_3) {
+ if (assoc->bFunctionSubClass ==
+ UAC3_FUNCTION_SUBCLASS_FULL_ADC_3_0) {
+ dev_err(uaudio_qdev->dev, "full adc is not supported\n");
+ ret = -EINVAL;
+ }
+
+ switch (le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize)) {
+ case UAC3_BADD_EP_MAXPSIZE_SYNC_MONO_16:
+ case UAC3_BADD_EP_MAXPSIZE_SYNC_STEREO_16:
+ case UAC3_BADD_EP_MAXPSIZE_ASYNC_MONO_16:
+ case UAC3_BADD_EP_MAXPSIZE_ASYNC_STEREO_16: {
+ resp->usb_audio_subslot_size = 0x2;
+ break;
+ }
+
+ case UAC3_BADD_EP_MAXPSIZE_SYNC_MONO_24:
+ case UAC3_BADD_EP_MAXPSIZE_SYNC_STEREO_24:
+ case UAC3_BADD_EP_MAXPSIZE_ASYNC_MONO_24:
+ case UAC3_BADD_EP_MAXPSIZE_ASYNC_STEREO_24: {
+ resp->usb_audio_subslot_size = 0x3;
+ break;
+ }
+
+ default:
+ dev_err(uaudio_qdev->dev,
+ "%d: %u: Invalid wMaxPacketSize\n",
+ subs->cur_audiofmt->iface,
+ subs->cur_audiofmt->altset_idx);
+ ret = -EINVAL;
+ goto err;
+ }
+ resp->usb_audio_subslot_size_valid = 1;
+ } else {
+ dev_err(uaudio_qdev->dev, "unknown protocol version %x\n",
+ protocol);
+ ret = -ENODEV;
+ goto err;
+ }
+
+ resp->slot_id = subs->dev->slot_id;
+ resp->slot_id_valid = 1;
+
+ memcpy(&resp->std_as_opr_intf_desc, &alts->desc, sizeof(alts->desc));
+ resp->std_as_opr_intf_desc_valid = 1;
+
+ ep = usb_pipe_endpoint(subs->dev, subs->data_endpoint->pipe);
+ if (!ep) {
+ dev_err(uaudio_qdev->dev, "data ep # %d context is null\n",
+ subs->data_endpoint->ep_num);
+ ret = -ENODEV;
+ goto err;
+ }
+ data_ep_pipe = subs->data_endpoint->pipe;
+ memcpy(&resp->std_as_data_ep_desc, &ep->desc, sizeof(ep->desc));
+ resp->std_as_data_ep_desc_valid = 1;
+
+ ret = xhci_sideband_add_endpoint(uadev[card_num].sb, ep);
+ if (ret < 0) {
+ dev_err(uaudio_qdev->dev, "failed to get data ep ring address\n");
+ ret = -ENODEV;
+ goto err;
+ }
+
+ pg = sg_page(uadev[card_num].sb->sgt->sgl);
+ tr_data_pa = page_to_phys(pg);
+ resp->xhci_mem_info.tr_data.pa = uadev[card_num].sb->ring->first_seg->dma;
+
+ if (subs->sync_endpoint) {
+ ep = usb_pipe_endpoint(subs->dev, subs->sync_endpoint->pipe);
+ if (!ep) {
+ dev_err(uaudio_qdev->dev, "implicit fb on data ep\n");
+ goto skip_sync_ep;
+ }
+ sync_ep_pipe = subs->sync_endpoint->pipe;
+ memcpy(&resp->std_as_sync_ep_desc, &ep->desc, sizeof(ep->desc));
+ resp->std_as_sync_ep_desc_valid = 1;
+
+ ret = xhci_sideband_add_endpoint(uadev[card_num].sb, ep);
+ if (ret < 0) {
+ dev_err(uaudio_qdev->dev,
+ "failed to get sync ep ring address\n");
+ ret = -ENODEV;
+ goto drop_data_ep;
+ }
+
+ pg = sg_page(uadev[card_num].sb->sgt->sgl);
+ tr_sync_pa = page_to_phys(pg);
+ resp->xhci_mem_info.tr_sync.pa = uadev[card_num].sb->ring->first_seg->dma;
+ }
+
+skip_sync_ep:
+ data = snd_soc_usb_get_priv_data(usb_get_usb_backend(subs->dev));
+ if (!data)
+ goto drop_sync_ep;
+
+ uaudio_qdev->domain = data->domain;
+ uaudio_qdev->sid = data->sid;
+ uaudio_qdev->intr_num = data->intr_num;
+ uaudio_qdev->dev = data->dev;
+
+ resp->interrupter_num_valid = 1;
+ resp->controller_num_valid = 0;
+ ret = usb_get_controller_id(subs->dev);
+ if (ret >= 0) {
+ resp->controller_num = ret;
+ resp->controller_num_valid = 1;
+ }
+ /* map xhci data structures PA memory to iova */
+ dma_coherent = dev_is_dma_coherent(subs->dev->bus->sysdev);
+
+ /* event ring */
+ hcd = bus_to_hcd(subs->dev->bus);
+ ir = xhci_create_secondary_interrupter(hcd, uaudio_qdev->intr_num);
+ if (!ir) {
+ dev_err(uaudio_qdev->dev, "failed to fetch interrupter\n");
+ ret = -ENODEV;
+ goto drop_sync_ep;
+ }
+
+ dma_get_sgtable(subs->dev->bus->sysdev, &sgt, ir->event_ring->first_seg->trbs,
+ ir->event_ring->first_seg->dma, TRB_SEGMENT_SIZE);
+ xhci_pa = page_to_phys(sg_page(sgt.sgl));
+ if (!xhci_pa) {
+ dev_err(uaudio_qdev->dev,
+ "failed to get sec event ring address\n");
+ ret = -ENODEV;
+ goto free_sec_ring;
+ }
+ sg_free_table(&sgt);
+
+ uaudio_qdev->ir = ir;
+ resp->interrupter_num = ir->intr_num;
+
+ va = uaudio_iommu_map(MEM_EVENT_RING, dma_coherent, xhci_pa, PAGE_SIZE,
+ NULL);
+ if (!va) {
+ ret = -ENOMEM;
+ goto free_sec_ring;
+ }
+
+ resp->xhci_mem_info.evt_ring.va = PREPEND_SID_TO_IOVA(va,
+ uaudio_qdev->sid);
+ resp->xhci_mem_info.evt_ring.pa = ir->event_ring->first_seg->dma;
+ resp->xhci_mem_info.evt_ring.size = PAGE_SIZE;
+ uaudio_qdev->er_mapped = true;
+
+ resp->speed_info = get_speed_info(subs->dev->speed);
+ if (resp->speed_info == USB_QMI_DEVICE_SPEED_INVALID_V01) {
+ ret = -ENODEV;
+ goto unmap_er;
+ }
+
+ resp->speed_info_valid = 1;
+
+ /* data transfer ring */
+ va = uaudio_iommu_map(MEM_XFER_RING, dma_coherent, tr_data_pa,
+ PAGE_SIZE, NULL);
+ if (!va) {
+ ret = -ENOMEM;
+ goto unmap_er;
+ }
+
+ tr_data_va = va;
+ resp->xhci_mem_info.tr_data.va = PREPEND_SID_TO_IOVA(va,
+ uaudio_qdev->sid);
+ resp->xhci_mem_info.tr_data.size = PAGE_SIZE;
+
+ /* sync transfer ring */
+ if (!resp->xhci_mem_info.tr_sync.pa)
+ goto skip_sync;
+
+ xhci_pa = resp->xhci_mem_info.tr_sync.pa;
+ va = uaudio_iommu_map(MEM_XFER_RING, dma_coherent, tr_sync_pa,
+ PAGE_SIZE, NULL);
+ if (!va) {
+ ret = -ENOMEM;
+ goto unmap_data;
+ }
+
+ tr_sync_va = va;
+ resp->xhci_mem_info.tr_sync.va = PREPEND_SID_TO_IOVA(va,
+ uaudio_qdev->sid);
+ resp->xhci_mem_info.tr_sync.size = PAGE_SIZE;
+
+skip_sync:
+ /* xfer buffer, multiple of 4K only */
+ if (!xfer_buf_len)
+ xfer_buf_len = PAGE_SIZE;
+
+ mult = xfer_buf_len / PAGE_SIZE;
+ remainder = xfer_buf_len % PAGE_SIZE;
+ len = mult * PAGE_SIZE;
+ len += remainder ? PAGE_SIZE : 0;
+
+ if (len > MAX_XFER_BUFF_LEN) {
+ dev_err(uaudio_qdev->dev,
+ "req buf len %d > max buf len %lu, setting %lu\n",
+ len, MAX_XFER_BUFF_LEN, MAX_XFER_BUFF_LEN);
+ len = MAX_XFER_BUFF_LEN;
+ }
+
+ xfer_buf = usb_alloc_coherent(subs->dev, len, GFP_KERNEL, &xfer_buf_pa);
+ if (!xfer_buf) {
+ ret = -ENOMEM;
+ goto unmap_sync;
+ }
+
+ dma_get_sgtable(subs->dev->bus->sysdev, &sgt, xfer_buf, xfer_buf_pa,
+ len);
+ va = uaudio_iommu_map(MEM_XFER_BUF, dma_coherent, xfer_buf_pa, len,
+ &sgt);
+ if (!va) {
+ ret = -ENOMEM;
+ goto unmap_sync;
+ }
+
+ resp->xhci_mem_info.xfer_buff.pa = xfer_buf_pa;
+ resp->xhci_mem_info.xfer_buff.size = len;
+
+ resp->xhci_mem_info.xfer_buff.va = PREPEND_SID_TO_IOVA(va,
+ uaudio_qdev->sid);
+
+ resp->xhci_mem_info_valid = 1;
+
+ sg_free_table(&sgt);
+
+ if (!atomic_read(&uadev[card_num].in_use)) {
+ kref_init(&uadev[card_num].kref);
+ init_waitqueue_head(&uadev[card_num].disconnect_wq);
+ uadev[card_num].num_intf =
+ subs->dev->config->desc.bNumInterfaces;
+ uadev[card_num].info = kcalloc(uadev[card_num].num_intf,
+ sizeof(struct intf_info), GFP_KERNEL);
+ if (!uadev[card_num].info) {
+ ret = -ENOMEM;
+ goto unmap_sync;
+ }
+ uadev[card_num].udev = subs->dev;
+ atomic_set(&uadev[card_num].in_use, 1);
+ } else {
+ kref_get(&uadev[card_num].kref);
+ }
+
+ //uadev[card_num].card_num = card_num;
+ uadev[card_num].usb_core_id = resp->controller_num;
+
+ /* cache intf specific info to use it for unmap and free xfer buf */
+ uadev[card_num].info[info_idx].data_xfer_ring_va = tr_data_va;
+ uadev[card_num].info[info_idx].data_xfer_ring_size = PAGE_SIZE;
+ uadev[card_num].info[info_idx].sync_xfer_ring_va = tr_sync_va;
+ uadev[card_num].info[info_idx].sync_xfer_ring_size = PAGE_SIZE;
+ uadev[card_num].info[info_idx].xfer_buf_va = va;
+ uadev[card_num].info[info_idx].xfer_buf_pa = xfer_buf_pa;
+ uadev[card_num].info[info_idx].xfer_buf_size = len;
+ uadev[card_num].info[info_idx].data_ep_pipe = data_ep_pipe;
+ uadev[card_num].info[info_idx].sync_ep_pipe = sync_ep_pipe;
+ uadev[card_num].info[info_idx].xfer_buf = xfer_buf;
+ uadev[card_num].info[info_idx].pcm_card_num = card_num;
+ uadev[card_num].info[info_idx].pcm_dev_num = pcm_dev_num;
+ uadev[card_num].info[info_idx].direction = subs->direction;
+ uadev[card_num].info[info_idx].intf_num = subs->cur_audiofmt->iface;
+ uadev[card_num].info[info_idx].in_use = true;
+
+ set_bit(card_num, &uaudio_qdev->card_slot);
+
+ return 0;
+
+unmap_sync:
+ usb_free_coherent(subs->dev, len, xfer_buf, xfer_buf_pa);
+ uaudio_iommu_unmap(MEM_XFER_RING, tr_sync_va, PAGE_SIZE, PAGE_SIZE);
+unmap_data:
+ uaudio_iommu_unmap(MEM_XFER_RING, tr_data_va, PAGE_SIZE, PAGE_SIZE);
+unmap_er:
+ uaudio_iommu_unmap(MEM_EVENT_RING, IOVA_BASE, PAGE_SIZE, PAGE_SIZE);
+free_sec_ring:
+ xhci_remove_secondary_interrupter(hcd, uaudio_qdev->ir);
+drop_sync_ep:
+ if (subs->sync_endpoint)
+ xhci_sideband_remove_endpoint(uadev[card_num].sb,
+ usb_pipe_endpoint(subs->dev, subs->sync_endpoint->pipe));
+drop_data_ep:
+ xhci_sideband_remove_endpoint(uadev[card_num].sb,
+ usb_pipe_endpoint(subs->dev, subs->data_endpoint->pipe));
+
+err:
+ return ret;
+}
+
+/**
+ * handle_uaudio_stream_req() - handle stream enable/disable request
+ * @handle: QMI client handle
+ * @sq: qrtr socket
+ * @txn: QMI transaction context
+ * @decoded_msg: decoded QMI message
+ *
+ * Main handler for the QMI stream enable/disable requests. This executes the
+ * corresponding enable/disable stream apis, respectively.
+ *
+ */
+static void handle_uaudio_stream_req(struct qmi_handle *handle,
+ struct sockaddr_qrtr *sq,
+ struct qmi_txn *txn,
+ const void *decoded_msg)
+{
+ struct qmi_uaudio_stream_req_msg_v01 *req_msg;
+ struct qmi_uaudio_stream_resp_msg_v01 resp = {{0}, 0};
+ struct snd_usb_substream *subs;
+ struct snd_usb_audio *chip = NULL;
+ struct uaudio_qmi_svc *svc = uaudio_svc;
+ struct intf_info *info;
+ struct usb_host_endpoint *ep;
+ u8 pcm_card_num, pcm_dev_num, direction;
+ int info_idx = -EINVAL, datainterval = -EINVAL, ret = 0;
+
+ if (!svc->client_connected) {
+ svc->client_sq = *sq;
+ svc->client_connected = true;
+ }
+
+ mutex_lock(&qdev_mutex);
+ req_msg = (struct qmi_uaudio_stream_req_msg_v01 *)decoded_msg;
+ if (!req_msg->audio_format_valid || !req_msg->bit_rate_valid ||
+ !req_msg->number_of_ch_valid || !req_msg->xfer_buff_size_valid) {
+ ret = -EINVAL;
+ goto response;
+ }
+
+ if (!uaudio_qdev) {
+ ret = -EINVAL;
+ goto response;
+ }
+
+ direction = (req_msg->usb_token & QMI_STREAM_REQ_DIRECTION);
+ pcm_dev_num = (req_msg->usb_token & QMI_STREAM_REQ_DEV_NUM_MASK) >> 8;
+ pcm_card_num = req_msg->enable ? uaudio_qdev->last_card_num :
+ ffs(uaudio_qdev->card_slot) - 1;
+ if (pcm_card_num >= SNDRV_CARDS) {
+ ret = -EINVAL;
+ goto response;
+ }
+
+ if (req_msg->audio_format > USB_QMI_PCM_FORMAT_U32_BE) {
+ ret = -EINVAL;
+ goto response;
+ }
+
+ subs = find_substream(pcm_card_num, pcm_dev_num, direction);
+ chip = uadev[pcm_card_num].chip;
+ if (!subs || !chip || atomic_read(&chip->shutdown)) {
+ ret = -ENODEV;
+ goto response;
+ }
+
+ info_idx = info_idx_from_ifnum(pcm_card_num, subs->cur_audiofmt ?
+ subs->cur_audiofmt->iface : -1, req_msg->enable);
+ if (atomic_read(&chip->shutdown) || !subs->stream || !subs->stream->pcm
+ || !subs->stream->chip) {
+ ret = -ENODEV;
+ goto response;
+ }
+
+ if (req_msg->enable) {
+ if (info_idx < 0 || chip->system_suspend) {
+ ret = -EBUSY;
+ goto response;
+ }
+ }
+
+ if (req_msg->service_interval_valid) {
+ ret = get_data_interval_from_si(subs,
+ req_msg->service_interval);
+ if (ret == -EINVAL)
+ goto response;
+
+ datainterval = ret;
+ }
+
+ uadev[pcm_card_num].ctrl_intf = chip->ctrl_intf;
+
+ if (req_msg->enable) {
+ ret = enable_audio_stream(subs,
+ map_pcm_format(req_msg->audio_format),
+ req_msg->number_of_ch, req_msg->bit_rate,
+ datainterval);
+
+ if (!ret)
+ ret = prepare_qmi_response(subs, req_msg, &resp,
+ info_idx);
+ } else {
+ info = &uadev[pcm_card_num].info[info_idx];
+ if (info->data_ep_pipe) {
+ ep = usb_pipe_endpoint(uadev[pcm_card_num].udev,
+ info->data_ep_pipe);
+ if (ep)
+ xhci_sideband_stop_endpoint(uadev[pcm_card_num].sb,
+ ep);
+ xhci_sideband_remove_endpoint(uadev[pcm_card_num].sb, ep);
+ info->data_ep_pipe = 0;
+ }
+
+ if (info->sync_ep_pipe) {
+ ep = usb_pipe_endpoint(uadev[pcm_card_num].udev,
+ info->sync_ep_pipe);
+ if (ep)
+ xhci_sideband_stop_endpoint(uadev[pcm_card_num].sb,
+ ep);
+ xhci_sideband_remove_endpoint(uadev[pcm_card_num].sb, ep);
+ info->sync_ep_pipe = 0;
+ }
+
+ disable_audio_stream(subs);
+ }
+
+response:
+ if (!req_msg->enable && ret != -EINVAL && ret != -ENODEV) {
+ mutex_lock(&chip->mutex);
+ if (info_idx >= 0) {
+ info = &uadev[pcm_card_num].info[info_idx];
+ uaudio_dev_intf_cleanup(
+ uadev[pcm_card_num].udev,
+ info);
+ }
+ if (atomic_read(&uadev[pcm_card_num].in_use))
+ kref_put(&uadev[pcm_card_num].kref,
+ uaudio_dev_release);
+ mutex_unlock(&chip->mutex);
+ }
+ mutex_unlock(&qdev_mutex);
+
+ resp.usb_token = req_msg->usb_token;
+ resp.usb_token_valid = 1;
+ resp.internal_status = ret;
+ resp.internal_status_valid = 1;
+ resp.status = ret ? USB_QMI_STREAM_REQ_FAILURE_V01 : ret;
+ resp.status_valid = 1;
+ ret = qmi_send_response(svc->uaudio_svc_hdl, sq, txn,
+ QMI_UAUDIO_STREAM_RESP_V01,
+ QMI_UAUDIO_STREAM_RESP_MSG_V01_MAX_MSG_LEN,
+ qmi_uaudio_stream_resp_msg_v01_ei, &resp);
+}
+
+static struct qmi_msg_handler uaudio_stream_req_handlers = {
+ .type = QMI_REQUEST,
+ .msg_id = QMI_UAUDIO_STREAM_REQ_V01,
+ .ei = qmi_uaudio_stream_req_msg_v01_ei,
+ .decoded_size = QMI_UAUDIO_STREAM_REQ_MSG_V01_MAX_MSG_LEN,
+ .fn = handle_uaudio_stream_req,
+};
+
+/**
+ * qc_usb_audio_offload_init_qmi_dev() - initializes qmi dev
+ *
+ * Initializes the USB qdev, which is used to carry information pertaining to
+ * the offloading resources. This device is freed only when there are no longer
+ * any offloading candidates. (i.e, when all audio devices are disconnected)
+ *
+ */
+static int qc_usb_audio_offload_init_qmi_dev(struct usb_device *udev)
+{
+ uaudio_qdev = kzalloc(sizeof(struct uaudio_qmi_dev),
+ GFP_KERNEL);
+ if (!uaudio_qdev)
+ return -ENOMEM;
+
+ /* initialize xfer ring and xfer buf iova list */
+ INIT_LIST_HEAD(&uaudio_qdev->xfer_ring_list);
+ uaudio_qdev->curr_xfer_ring_iova = IOVA_XFER_RING_BASE;
+ uaudio_qdev->xfer_ring_iova_size =
+ IOVA_XFER_RING_MAX - IOVA_XFER_RING_BASE;
+
+ INIT_LIST_HEAD(&uaudio_qdev->xfer_buf_list);
+ uaudio_qdev->curr_xfer_buf_iova = IOVA_XFER_BUF_BASE;
+ uaudio_qdev->xfer_buf_iova_size =
+ IOVA_XFER_BUF_MAX - IOVA_XFER_BUF_BASE;
+
+ return 0;
+}
+
+/**
+ * qc_usb_audio_offload_probe() - platform op connect handler
+ * @chip: USB SND device
+ *
+ * Platform connect handler when a USB SND device is detected. Will
+ * notify SOC USB about the connection to enable the USB ASoC backend
+ * and populate internal USB chip array.
+ *
+ */
+static void qc_usb_audio_offload_probe(struct snd_usb_audio *chip)
+{
+ struct usb_device *udev = chip->dev;
+ struct xhci_sideband *sb;
+
+ /*
+ * If there is no priv_data, the connected device is on a USB bus
+ * that doesn't support offloading. Avoid populating entries for
+ * this device.
+ */
+ if (!snd_soc_usb_get_priv_data(usb_get_usb_backend(udev)))
+ return;
+
+ sb = xhci_sideband_register(udev);
+ if (!sb)
+ return;
+
+ mutex_lock(&chip->mutex);
+ uadev[chip->card->number].sb = sb;
+ uadev[chip->card->number].chip = chip;
+ uaudio_qdev->last_card_num = chip->card->number;
+ mutex_unlock(&chip->mutex);
+
+ mutex_lock(&qdev_mutex);
+ if (!uaudio_qdev)
+ qc_usb_audio_offload_init_qmi_dev(udev);
+
+ atomic_inc(&uaudio_qdev->qdev_in_use);
+ mutex_unlock(&qdev_mutex);
+
+ snd_soc_usb_connect(usb_get_usb_backend(udev), chip->index);
+}
+
+/**
+ * qc_usb_audio_cleanup_qmi_dev() - release qmi device
+ *
+ * Frees the USB qdev. Only occurs when there are no longer any potential
+ * devices that can utilize USB audio offloading.
+ *
+ */
+static void qc_usb_audio_cleanup_qmi_dev(void)
+{
+ kfree(uaudio_qdev);
+ uaudio_qdev = NULL;
+}
+
+/**
+ * qc_usb_audio_offload_disconnect() - platform op disconnect handler
+ * @chip: USB SND device
+ *
+ * Platform disconnect handler. Will ensure that any pending stream is
+ * halted by issuing a QMI disconnect indication packet to the adsp.
+ *
+ */
+static void qc_usb_audio_offload_disconnect(struct snd_usb_audio *chip)
+{
+ struct usb_device *udev = chip->dev;
+ struct qmi_uaudio_stream_ind_msg_v01 disconnect_ind = {0};
+ struct uaudio_qmi_svc *svc = uaudio_svc;
+ struct uaudio_dev *dev;
+ int card_num;
+ int ret;
+
+ if (!chip)
+ return;
+
+ card_num = chip->card->number;
+ if (card_num >= SNDRV_CARDS)
+ return;
+
+ mutex_lock(&chip->mutex);
+ dev = &uadev[card_num];
+
+ /* Device has already been cleaned up, or never populated */
+ if (!dev->chip)
+ return;
+
+ /* clean up */
+ if (!dev->udev)
+ goto done;
+
+ if (atomic_read(&dev->in_use)) {
+ mutex_unlock(&chip->mutex);
+ dev_dbg(uaudio_qdev->dev, "sending qmi indication disconnect\n");
+ disconnect_ind.dev_event = USB_QMI_DEV_DISCONNECT_V01;
+ disconnect_ind.slot_id = dev->udev->slot_id;
+ disconnect_ind.controller_num = dev->usb_core_id;
+ disconnect_ind.controller_num_valid = 1;
+ ret = qmi_send_indication(svc->uaudio_svc_hdl, &svc->client_sq,
+ QMI_UAUDIO_STREAM_IND_V01,
+ QMI_UAUDIO_STREAM_IND_MSG_V01_MAX_MSG_LEN,
+ qmi_uaudio_stream_ind_msg_v01_ei,
+ &disconnect_ind);
+ if (ret < 0)
+ dev_err(uaudio_qdev->dev,
+ "qmi send failed with err: %d\n", ret);
+
+ ret = wait_event_interruptible_timeout(dev->disconnect_wq,
+ !atomic_read(&dev->in_use),
+ msecs_to_jiffies(DEV_RELEASE_WAIT_TIMEOUT));
+ if (!ret) {
+ dev_err(uaudio_qdev->dev,
+ "timeout while waiting for dev_release\n");
+ atomic_set(&dev->in_use, 0);
+ } else if (ret < 0) {
+ dev_err(uaudio_qdev->dev, "failed with ret %d\n", ret);
+ atomic_set(&dev->in_use, 0);
+ }
+ mutex_lock(&chip->mutex);
+ }
+
+ uaudio_dev_cleanup(dev);
+done:
+ dev->chip = NULL;
+ mutex_unlock(&chip->mutex);
+
+ mutex_lock(&qdev_mutex);
+ atomic_dec(&uaudio_qdev->qdev_in_use);
+ if (!atomic_read(&uaudio_qdev->qdev_in_use)) {
+ snd_soc_usb_disconnect(usb_get_usb_backend(udev));
+ qc_usb_audio_cleanup_qmi_dev();
+ }
+ mutex_unlock(&qdev_mutex);
+
+ xhci_sideband_unregister(dev->sb);
+}
+
+/**
+ * qc_usb_audio_offload_suspend() - USB offload PM suspend handler
+ * @intf: USB interface
+ * @message: suspend type
+ *
+ * PM suspend handler to ensure that the USB offloading driver is able to stop
+ * any pending traffic, so that the bus can be suspended.
+ *
+ */
+static void qc_usb_audio_offload_suspend(struct usb_interface *intf, pm_message_t message)
+{
+ struct snd_usb_audio *chip = usb_get_intfdata(intf);
+ struct qmi_uaudio_stream_ind_msg_v01 disconnect_ind = {0};
+ struct uaudio_qmi_svc *svc = uaudio_svc;
+ struct uaudio_dev *dev;
+ int card_num;
+ int ret;
+
+ if (!chip)
+ return;
+
+ card_num = chip->card->number;
+ if (card_num >= SNDRV_CARDS)
+ return;
+
+
+ mutex_lock(&chip->mutex);
+ dev = &uadev[card_num];
+
+ if (atomic_read(&dev->in_use)) {
+ mutex_unlock(&chip->mutex);
+ dev_dbg(uaudio_qdev->dev, "sending qmi indication suspend\n");
+ disconnect_ind.dev_event = USB_QMI_DEV_DISCONNECT_V01;
+ disconnect_ind.slot_id = dev->udev->slot_id;
+ disconnect_ind.controller_num = dev->usb_core_id;
+ disconnect_ind.controller_num_valid = 1;
+ ret = qmi_send_indication(svc->uaudio_svc_hdl, &svc->client_sq,
+ QMI_UAUDIO_STREAM_IND_V01,
+ QMI_UAUDIO_STREAM_IND_MSG_V01_MAX_MSG_LEN,
+ qmi_uaudio_stream_ind_msg_v01_ei,
+ &disconnect_ind);
+ if (ret < 0)
+ dev_err(uaudio_qdev->dev,
+ "qmi send failed with err: %d\n", ret);
+
+ ret = wait_event_interruptible_timeout(dev->disconnect_wq,
+ !atomic_read(&dev->in_use),
+ msecs_to_jiffies(DEV_RELEASE_WAIT_TIMEOUT));
+ if (!ret) {
+ dev_err(uaudio_qdev->dev,
+ "timeout while waiting for dev_release\n");
+ atomic_set(&dev->in_use, 0);
+ } else if (ret < 0) {
+ dev_err(uaudio_qdev->dev, "failed with ret %d\n", ret);
+ atomic_set(&dev->in_use, 0);
+ }
+ mutex_lock(&chip->mutex);
+ }
+ mutex_unlock(&chip->mutex);
+}
+
+static struct snd_usb_platform_ops offload_ops = {
+ .connect_cb = qc_usb_audio_offload_probe,
+ .disconnect_cb = qc_usb_audio_offload_disconnect,
+ .suspend_cb = qc_usb_audio_offload_suspend,
+};
+
+static int __init qc_usb_audio_offload_init(void)
+{
+ struct uaudio_qmi_svc *svc;
+ int ret;
+
+ ret = snd_usb_register_platform_ops(&offload_ops);
+ if (ret < 0)
+ return ret;
+
+ svc = kzalloc(sizeof(struct uaudio_qmi_svc), GFP_KERNEL);
+ if (!svc) {
+ ret = -ENOMEM;
+ goto unreg_ops;
+ }
+
+ svc->uaudio_wq = create_singlethread_workqueue("uaudio_svc");
+ if (!svc->uaudio_wq) {
+ ret = -ENOMEM;
+ goto free_svc;
+ }
+
+ svc->uaudio_svc_hdl = kzalloc(sizeof(struct qmi_handle), GFP_KERNEL);
+ if (!svc->uaudio_svc_hdl) {
+ ret = -ENOMEM;
+ goto free_wq;
+ }
+
+ ret = qmi_handle_init(svc->uaudio_svc_hdl,
+ QMI_UAUDIO_STREAM_REQ_MSG_V01_MAX_MSG_LEN,
+ &uaudio_svc_ops_options,
+ &uaudio_stream_req_handlers);
+ ret = qmi_add_server(svc->uaudio_svc_hdl, UAUDIO_STREAM_SERVICE_ID_V01,
+ UAUDIO_STREAM_SERVICE_VERS_V01, 0);
+
+ INIT_WORK(&svc->qmi_disconnect_work, qmi_disconnect_work);
+ uaudio_svc = svc;
+
+ return 0;
+
+free_wq:
+ destroy_workqueue(svc->uaudio_wq);
+free_svc:
+ kfree(svc);
+unreg_ops:
+ snd_usb_unregister_platform_ops();
+
+ return ret;
+}
+
+static void __exit qc_usb_audio_offload_exit(void)
+{
+ struct uaudio_qmi_svc *svc = uaudio_svc;
+
+ qmi_handle_release(svc->uaudio_svc_hdl);
+ flush_workqueue(svc->uaudio_wq);
+ destroy_workqueue(svc->uaudio_wq);
+ kfree(svc);
+ uaudio_svc = NULL;
+ snd_usb_unregister_platform_ops();
+}
+
+module_init(qc_usb_audio_offload_init);
+module_exit(qc_usb_audio_offload_exit);
+
+MODULE_DESCRIPTION("QC USB Audio Offloading");
+MODULE_LICENSE("GPL");