OSCL-LXR linux-6.0.1/​drivers/​thunderbolt/​dma_test.c	Source navigation Diff markup Identifier search General search
	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0
 /*
  * DMA traffic test driver
  *
  * Copyright (C) 2020, Intel Corporation
  * Authors: Isaac Hazan <isaac.hazan@intel.com>
  *      Mika Westerberg <mika.westerberg@linux.intel.com>
  */
 
 #include <linux/completion.h>
 #include <linux/debugfs.h>
 #include <linux/module.h>
 #include <linux/sizes.h>
 #include <linux/thunderbolt.h>
 
 #define DMA_TEST_TX_RING_SIZE       64
 #define DMA_TEST_RX_RING_SIZE       256
 #define DMA_TEST_FRAME_SIZE     SZ_4K
 #define DMA_TEST_DATA_PATTERN       0x0123456789abcdefLL
 #define DMA_TEST_MAX_PACKETS        1000
 
 enum dma_test_frame_pdf {
     DMA_TEST_PDF_FRAME_START = 1,
     DMA_TEST_PDF_FRAME_END,
 };
 
 struct dma_test_frame {
     struct dma_test *dma_test;
     void *data;
     struct ring_frame frame;
 };
 
 enum dma_test_test_error {
     DMA_TEST_NO_ERROR,
     DMA_TEST_INTERRUPTED,
     DMA_TEST_BUFFER_ERROR,
     DMA_TEST_DMA_ERROR,
     DMA_TEST_CONFIG_ERROR,
     DMA_TEST_SPEED_ERROR,
     DMA_TEST_WIDTH_ERROR,
     DMA_TEST_BONDING_ERROR,
     DMA_TEST_PACKET_ERROR,
 };
 
 static const char * const dma_test_error_names[] = {
     [DMA_TEST_NO_ERROR] = "no errors",
     [DMA_TEST_INTERRUPTED] = "interrupted by signal",
     [DMA_TEST_BUFFER_ERROR] = "no memory for packet buffers",
     [DMA_TEST_DMA_ERROR] = "DMA ring setup failed",
     [DMA_TEST_CONFIG_ERROR] = "configuration is not valid",
     [DMA_TEST_SPEED_ERROR] = "unexpected link speed",
     [DMA_TEST_WIDTH_ERROR] = "unexpected link width",
     [DMA_TEST_BONDING_ERROR] = "lane bonding configuration error",
     [DMA_TEST_PACKET_ERROR] = "packet check failed",
 };
 
 enum dma_test_result {
     DMA_TEST_NOT_RUN,
     DMA_TEST_SUCCESS,
     DMA_TEST_FAIL,
 };
 
 static const char * const dma_test_result_names[] = {
     [DMA_TEST_NOT_RUN] = "not run",
     [DMA_TEST_SUCCESS] = "success",
     [DMA_TEST_FAIL] = "failed",
 };
 
 /**
  * struct dma_test - DMA test device driver private data
  * @svc: XDomain service the driver is bound to
  * @xd: XDomain the service belongs to
  * @rx_ring: Software ring holding RX frames
  * @rx_hopid: HopID used for receiving frames
  * @tx_ring: Software ring holding TX frames
  * @tx_hopid: HopID used for sending fames
  * @packets_to_send: Number of packets to send
  * @packets_to_receive: Number of packets to receive
  * @packets_sent: Actual number of packets sent
  * @packets_received: Actual number of packets received
  * @link_speed: Expected link speed (Gb/s), %0 to use whatever is negotiated
  * @link_width: Expected link width (Gb/s), %0 to use whatever is negotiated
  * @crc_errors: Number of CRC errors during the test run
  * @buffer_overflow_errors: Number of buffer overflow errors during the test
  *              run
  * @result: Result of the last run
  * @error_code: Error code of the last run
  * @complete: Used to wait for the Rx to complete
  * @lock: Lock serializing access to this structure
  * @debugfs_dir: dentry of this dma_test
  */
 struct dma_test {
     const struct tb_service *svc;
     struct tb_xdomain *xd;
     struct tb_ring *rx_ring;
     int rx_hopid;
     struct tb_ring *tx_ring;
     int tx_hopid;
     unsigned int packets_to_send;
     unsigned int packets_to_receive;
     unsigned int packets_sent;
     unsigned int packets_received;
     unsigned int link_speed;
     unsigned int link_width;
     unsigned int crc_errors;
     unsigned int buffer_overflow_errors;
     enum dma_test_result result;
     enum dma_test_test_error error_code;
     struct completion complete;
     struct mutex lock;
     struct dentry *debugfs_dir;
 };
 
 /* DMA test property directory UUID: 3188cd10-6523-4a5a-a682-fdca07a248d8 */
 static const uuid_t dma_test_dir_uuid =
     UUID_INIT(0x3188cd10, 0x6523, 0x4a5a,
           0xa6, 0x82, 0xfd, 0xca, 0x07, 0xa2, 0x48, 0xd8);
 
 static struct tb_property_dir *dma_test_dir;
 static void *dma_test_pattern;
 
 static void dma_test_free_rings(struct dma_test *dt)
 {
     if (dt->rx_ring) {
         tb_xdomain_release_in_hopid(dt->xd, dt->rx_hopid);
         tb_ring_free(dt->rx_ring);
         dt->rx_ring = NULL;
     }
     if (dt->tx_ring) {
         tb_xdomain_release_out_hopid(dt->xd, dt->tx_hopid);
         tb_ring_free(dt->tx_ring);
         dt->tx_ring = NULL;
     }
 }
 
 static int dma_test_start_rings(struct dma_test *dt)
 {
     unsigned int flags = RING_FLAG_FRAME;
     struct tb_xdomain *xd = dt->xd;
     int ret, e2e_tx_hop = 0;
     struct tb_ring *ring;
 
     /*
      * If we are both sender and receiver (traffic goes over a
      * special loopback dongle) enable E2E flow control. This avoids
      * losing packets.
      */
     if (dt->packets_to_send && dt->packets_to_receive)
         flags |= RING_FLAG_E2E;
 
     if (dt->packets_to_send) {
         ring = tb_ring_alloc_tx(xd->tb->nhi, -1, DMA_TEST_TX_RING_SIZE,
                     flags);
         if (!ring)
             return -ENOMEM;
 
         dt->tx_ring = ring;
         e2e_tx_hop = ring->hop;
 
         ret = tb_xdomain_alloc_out_hopid(xd, -1);
         if (ret < 0) {
             dma_test_free_rings(dt);
             return ret;
         }
 
         dt->tx_hopid = ret;
     }
 
     if (dt->packets_to_receive) {
         u16 sof_mask, eof_mask;
 
         sof_mask = BIT(DMA_TEST_PDF_FRAME_START);
         eof_mask = BIT(DMA_TEST_PDF_FRAME_END);
 
         ring = tb_ring_alloc_rx(xd->tb->nhi, -1, DMA_TEST_RX_RING_SIZE,
                     flags, e2e_tx_hop, sof_mask, eof_mask,
                     NULL, NULL);
         if (!ring) {
             dma_test_free_rings(dt);
             return -ENOMEM;
         }
 
         dt->rx_ring = ring;
 
         ret = tb_xdomain_alloc_in_hopid(xd, -1);
         if (ret < 0) {
             dma_test_free_rings(dt);
             return ret;
         }
 
         dt->rx_hopid = ret;
     }
 
     ret = tb_xdomain_enable_paths(dt->xd, dt->tx_hopid,
                       dt->tx_ring ? dt->tx_ring->hop : 0,
                       dt->rx_hopid,
                       dt->rx_ring ? dt->rx_ring->hop : 0);
     if (ret) {
         dma_test_free_rings(dt);
         return ret;
     }
 
     if (dt->tx_ring)
         tb_ring_start(dt->tx_ring);
     if (dt->rx_ring)
         tb_ring_start(dt->rx_ring);
 
     return 0;
 }
 
 static void dma_test_stop_rings(struct dma_test *dt)
 {
     int ret;
 
     if (dt->rx_ring)
         tb_ring_stop(dt->rx_ring);
     if (dt->tx_ring)
         tb_ring_stop(dt->tx_ring);
 
     ret = tb_xdomain_disable_paths(dt->xd, dt->tx_hopid,
                        dt->tx_ring ? dt->tx_ring->hop : 0,
                        dt->rx_hopid,
                        dt->rx_ring ? dt->rx_ring->hop : 0);
     if (ret)
         dev_warn(&dt->svc->dev, "failed to disable DMA paths\n");
 
     dma_test_free_rings(dt);
 }
 
 static void dma_test_rx_callback(struct tb_ring *ring, struct ring_frame *frame,
                  bool canceled)
 {
     struct dma_test_frame *tf = container_of(frame, typeof(*tf), frame);
     struct dma_test *dt = tf->dma_test;
     struct device *dma_dev = tb_ring_dma_device(dt->rx_ring);
 
     dma_unmap_single(dma_dev, tf->frame.buffer_phy, DMA_TEST_FRAME_SIZE,
              DMA_FROM_DEVICE);
     kfree(tf->data);
 
     if (canceled) {
         kfree(tf);
         return;
     }
 
     dt->packets_received++;
     dev_dbg(&dt->svc->dev, "packet %u/%u received\n", dt->packets_received,
         dt->packets_to_receive);
 
     if (tf->frame.flags & RING_DESC_CRC_ERROR)
         dt->crc_errors++;
     if (tf->frame.flags & RING_DESC_BUFFER_OVERRUN)
         dt->buffer_overflow_errors++;
 
     kfree(tf);
 
     if (dt->packets_received == dt->packets_to_receive)
         complete(&dt->complete);
 }
 
 static int dma_test_submit_rx(struct dma_test *dt, size_t npackets)
 {
     struct device *dma_dev = tb_ring_dma_device(dt->rx_ring);
     int i;
 
     for (i = 0; i < npackets; i++) {
         struct dma_test_frame *tf;
         dma_addr_t dma_addr;
 
         tf = kzalloc(sizeof(*tf), GFP_KERNEL);
         if (!tf)
             return -ENOMEM;
 
         tf->data = kzalloc(DMA_TEST_FRAME_SIZE, GFP_KERNEL);
         if (!tf->data) {
             kfree(tf);
             return -ENOMEM;
         }
 
         dma_addr = dma_map_single(dma_dev, tf->data, DMA_TEST_FRAME_SIZE,
                       DMA_FROM_DEVICE);
         if (dma_mapping_error(dma_dev, dma_addr)) {
             kfree(tf->data);
             kfree(tf);
             return -ENOMEM;
         }
 
         tf->frame.buffer_phy = dma_addr;
         tf->frame.callback = dma_test_rx_callback;
         tf->dma_test = dt;
         INIT_LIST_HEAD(&tf->frame.list);
 
         tb_ring_rx(dt->rx_ring, &tf->frame);
     }
 
     return 0;
 }
 
 static void dma_test_tx_callback(struct tb_ring *ring, struct ring_frame *frame,
                  bool canceled)
 {
     struct dma_test_frame *tf = container_of(frame, typeof(*tf), frame);
     struct dma_test *dt = tf->dma_test;
     struct device *dma_dev = tb_ring_dma_device(dt->tx_ring);
 
     dma_unmap_single(dma_dev, tf->frame.buffer_phy, DMA_TEST_FRAME_SIZE,
              DMA_TO_DEVICE);
     kfree(tf->data);
     kfree(tf);
 }
 
 static int dma_test_submit_tx(struct dma_test *dt, size_t npackets)
 {
     struct device *dma_dev = tb_ring_dma_device(dt->tx_ring);
     int i;
 
     for (i = 0; i < npackets; i++) {
         struct dma_test_frame *tf;
         dma_addr_t dma_addr;
 
         tf = kzalloc(sizeof(*tf), GFP_KERNEL);
         if (!tf)
             return -ENOMEM;
 
         tf->frame.size = 0; /* means 4096 */
         tf->dma_test = dt;
 
         tf->data = kmemdup(dma_test_pattern, DMA_TEST_FRAME_SIZE, GFP_KERNEL);
         if (!tf->data) {
             kfree(tf);
             return -ENOMEM;
         }
 
         dma_addr = dma_map_single(dma_dev, tf->data, DMA_TEST_FRAME_SIZE,
                       DMA_TO_DEVICE);
         if (dma_mapping_error(dma_dev, dma_addr)) {
             kfree(tf->data);
             kfree(tf);
             return -ENOMEM;
         }
 
         tf->frame.buffer_phy = dma_addr;
         tf->frame.callback = dma_test_tx_callback;
         tf->frame.sof = DMA_TEST_PDF_FRAME_START;
         tf->frame.eof = DMA_TEST_PDF_FRAME_END;
         INIT_LIST_HEAD(&tf->frame.list);
 
         dt->packets_sent++;
         dev_dbg(&dt->svc->dev, "packet %u/%u sent\n", dt->packets_sent,
             dt->packets_to_send);
 
         tb_ring_tx(dt->tx_ring, &tf->frame);
     }
 
     return 0;
 }
 
 #define DMA_TEST_DEBUGFS_ATTR(__fops, __get, __validate, __set) \
 static int __fops ## _show(void *data, u64 *val)        \
 {                               \
     struct tb_service *svc = data;              \
     struct dma_test *dt = tb_service_get_drvdata(svc);  \
     int ret;                        \
                                 \
     ret = mutex_lock_interruptible(&dt->lock);      \
     if (ret)                        \
         return ret;                 \
     __get(dt, val);                     \
     mutex_unlock(&dt->lock);                \
     return 0;                       \
 }                               \
 static int __fops ## _store(void *data, u64 val)        \
 {                               \
     struct tb_service *svc = data;              \
     struct dma_test *dt = tb_service_get_drvdata(svc);  \
     int ret;                        \
                                 \
     ret = __validate(val);                  \
     if (ret)                        \
         return ret;                 \
     ret = mutex_lock_interruptible(&dt->lock);      \
     if (ret)                        \
         return ret;                 \
     __set(dt, val);                     \
     mutex_unlock(&dt->lock);                \
     return 0;                       \
 }                               \
 DEFINE_DEBUGFS_ATTRIBUTE(__fops ## _fops, __fops ## _show,  \
              __fops ## _store, "%llu\n")
 
 static void lanes_get(const struct dma_test *dt, u64 *val)
 {
     *val = dt->link_width;
 }
 
 static int lanes_validate(u64 val)
 {
     return val > 2 ? -EINVAL : 0;
 }
 
 static void lanes_set(struct dma_test *dt, u64 val)
 {
     dt->link_width = val;
 }
 DMA_TEST_DEBUGFS_ATTR(lanes, lanes_get, lanes_validate, lanes_set);
 
 static void speed_get(const struct dma_test *dt, u64 *val)
 {
     *val = dt->link_speed;
 }
 
 static int speed_validate(u64 val)
 {
     switch (val) {
     case 20:
     case 10:
     case 0:
         return 0;
     default:
         return -EINVAL;
     }
 }
 
 static void speed_set(struct dma_test *dt, u64 val)
 {
     dt->link_speed = val;
 }
 DMA_TEST_DEBUGFS_ATTR(speed, speed_get, speed_validate, speed_set);
 
 static void packets_to_receive_get(const struct dma_test *dt, u64 *val)
 {
     *val = dt->packets_to_receive;
 }
 
 static int packets_to_receive_validate(u64 val)
 {
     return val > DMA_TEST_MAX_PACKETS ? -EINVAL : 0;
 }
 
 static void packets_to_receive_set(struct dma_test *dt, u64 val)
 {
     dt->packets_to_receive = val;
 }
 DMA_TEST_DEBUGFS_ATTR(packets_to_receive, packets_to_receive_get,
               packets_to_receive_validate, packets_to_receive_set);
 
 static void packets_to_send_get(const struct dma_test *dt, u64 *val)
 {
     *val = dt->packets_to_send;
 }
 
 static int packets_to_send_validate(u64 val)
 {
     return val > DMA_TEST_MAX_PACKETS ? -EINVAL : 0;
 }
 
 static void packets_to_send_set(struct dma_test *dt, u64 val)
 {
     dt->packets_to_send = val;
 }
 DMA_TEST_DEBUGFS_ATTR(packets_to_send, packets_to_send_get,
               packets_to_send_validate, packets_to_send_set);
 
 static int dma_test_set_bonding(struct dma_test *dt)
 {
     switch (dt->link_width) {
     case 2:
         return tb_xdomain_lane_bonding_enable(dt->xd);
     case 1:
         tb_xdomain_lane_bonding_disable(dt->xd);
         fallthrough;
     default:
         return 0;
     }
 }
 
 static bool dma_test_validate_config(struct dma_test *dt)
 {
     if (!dt->packets_to_send && !dt->packets_to_receive)
         return false;
     if (dt->packets_to_send && dt->packets_to_receive &&
         dt->packets_to_send != dt->packets_to_receive)
         return false;
     return true;
 }
 
 static void dma_test_check_errors(struct dma_test *dt, int ret)
 {
     if (!dt->error_code) {
         if (dt->link_speed && dt->xd->link_speed != dt->link_speed) {
             dt->error_code = DMA_TEST_SPEED_ERROR;
         } else if (dt->link_width &&
                dt->xd->link_width != dt->link_width) {
             dt->error_code = DMA_TEST_WIDTH_ERROR;
         } else if (dt->packets_to_send != dt->packets_sent ||
              dt->packets_to_receive != dt->packets_received ||
              dt->crc_errors || dt->buffer_overflow_errors) {
             dt->error_code = DMA_TEST_PACKET_ERROR;
         } else {
             return;
         }
     }
 
     dt->result = DMA_TEST_FAIL;
 }
 
 static int test_store(void *data, u64 val)
 {
     struct tb_service *svc = data;
     struct dma_test *dt = tb_service_get_drvdata(svc);
     int ret;
 
     if (val != 1)
         return -EINVAL;
 
     ret = mutex_lock_interruptible(&dt->lock);
     if (ret)
         return ret;
 
     dt->packets_sent = 0;
     dt->packets_received = 0;
     dt->crc_errors = 0;
     dt->buffer_overflow_errors = 0;
     dt->result = DMA_TEST_SUCCESS;
     dt->error_code = DMA_TEST_NO_ERROR;
 
     dev_dbg(&svc->dev, "DMA test starting\n");
     if (dt->link_speed)
         dev_dbg(&svc->dev, "link_speed: %u Gb/s\n", dt->link_speed);
     if (dt->link_width)
         dev_dbg(&svc->dev, "link_width: %u\n", dt->link_width);
     dev_dbg(&svc->dev, "packets_to_send: %u\n", dt->packets_to_send);
     dev_dbg(&svc->dev, "packets_to_receive: %u\n", dt->packets_to_receive);
 
     if (!dma_test_validate_config(dt)) {
         dev_err(&svc->dev, "invalid test configuration\n");
         dt->error_code = DMA_TEST_CONFIG_ERROR;
         goto out_unlock;
     }
 
     ret = dma_test_set_bonding(dt);
     if (ret) {
         dev_err(&svc->dev, "failed to set lanes\n");
         dt->error_code = DMA_TEST_BONDING_ERROR;
         goto out_unlock;
     }
 
     ret = dma_test_start_rings(dt);
     if (ret) {
         dev_err(&svc->dev, "failed to enable DMA rings\n");
         dt->error_code = DMA_TEST_DMA_ERROR;
         goto out_unlock;
     }
 
     if (dt->packets_to_receive) {
         reinit_completion(&dt->complete);
         ret = dma_test_submit_rx(dt, dt->packets_to_receive);
         if (ret) {
             dev_err(&svc->dev, "failed to submit receive buffers\n");
             dt->error_code = DMA_TEST_BUFFER_ERROR;
             goto out_stop;
         }
     }
 
     if (dt->packets_to_send) {
         ret = dma_test_submit_tx(dt, dt->packets_to_send);
         if (ret) {
             dev_err(&svc->dev, "failed to submit transmit buffers\n");
             dt->error_code = DMA_TEST_BUFFER_ERROR;
             goto out_stop;
         }
     }
 
     if (dt->packets_to_receive) {
         ret = wait_for_completion_interruptible(&dt->complete);
         if (ret) {
             dt->error_code = DMA_TEST_INTERRUPTED;
             goto out_stop;
         }
     }
 
 out_stop:
     dma_test_stop_rings(dt);
 out_unlock:
     dma_test_check_errors(dt, ret);
     mutex_unlock(&dt->lock);
 
     dev_dbg(&svc->dev, "DMA test %s\n", dma_test_result_names[dt->result]);
     return ret;
 }
 DEFINE_DEBUGFS_ATTRIBUTE(test_fops, NULL, test_store, "%llu\n");
 
 static int status_show(struct seq_file *s, void *not_used)
 {
     struct tb_service *svc = s->private;
     struct dma_test *dt = tb_service_get_drvdata(svc);
     int ret;
 
     ret = mutex_lock_interruptible(&dt->lock);
     if (ret)
         return ret;
 
     seq_printf(s, "result: %s\n", dma_test_result_names[dt->result]);
     if (dt->result == DMA_TEST_NOT_RUN)
         goto out_unlock;
 
     seq_printf(s, "packets received: %u\n", dt->packets_received);
     seq_printf(s, "packets sent: %u\n", dt->packets_sent);
     seq_printf(s, "CRC errors: %u\n", dt->crc_errors);
     seq_printf(s, "buffer overflow errors: %u\n",
            dt->buffer_overflow_errors);
     seq_printf(s, "error: %s\n", dma_test_error_names[dt->error_code]);
 
 out_unlock:
     mutex_unlock(&dt->lock);
     return 0;
 }
 DEFINE_SHOW_ATTRIBUTE(status);
 
 static void dma_test_debugfs_init(struct tb_service *svc)
 {
     struct dma_test *dt = tb_service_get_drvdata(svc);
 
     dt->debugfs_dir = debugfs_create_dir("dma_test", svc->debugfs_dir);
 
     debugfs_create_file("lanes", 0600, dt->debugfs_dir, svc, &lanes_fops);
     debugfs_create_file("speed", 0600, dt->debugfs_dir, svc, &speed_fops);
     debugfs_create_file("packets_to_receive", 0600, dt->debugfs_dir, svc,
                 &packets_to_receive_fops);
     debugfs_create_file("packets_to_send", 0600, dt->debugfs_dir, svc,
                 &packets_to_send_fops);
     debugfs_create_file("status", 0400, dt->debugfs_dir, svc, &status_fops);
     debugfs_create_file("test", 0200, dt->debugfs_dir, svc, &test_fops);
 }
 
 static int dma_test_probe(struct tb_service *svc, const struct tb_service_id *id)
 {
     struct tb_xdomain *xd = tb_service_parent(svc);
     struct dma_test *dt;
 
     dt = devm_kzalloc(&svc->dev, sizeof(*dt), GFP_KERNEL);
     if (!dt)
         return -ENOMEM;
 
     dt->svc = svc;
     dt->xd = xd;
     mutex_init(&dt->lock);
     init_completion(&dt->complete);
 
     tb_service_set_drvdata(svc, dt);
     dma_test_debugfs_init(svc);
 
     return 0;
 }
 
 static void dma_test_remove(struct tb_service *svc)
 {
     struct dma_test *dt = tb_service_get_drvdata(svc);
 
     mutex_lock(&dt->lock);
     debugfs_remove_recursive(dt->debugfs_dir);
     mutex_unlock(&dt->lock);
 }
 
 static int __maybe_unused dma_test_suspend(struct device *dev)
 {
     /*
      * No need to do anything special here. If userspace is writing
      * to the test attribute when suspend started, it comes out from
      * wait_for_completion_interruptible() with -ERESTARTSYS and the
      * DMA test fails tearing down the rings. Once userspace is
      * thawed the kernel restarts the write syscall effectively
      * re-running the test.
      */
     return 0;
 }
 
 static int __maybe_unused dma_test_resume(struct device *dev)
 {
     return 0;
 }
 
 static const struct dev_pm_ops dma_test_pm_ops = {
     SET_SYSTEM_SLEEP_PM_OPS(dma_test_suspend, dma_test_resume)
 };
 
 static const struct tb_service_id dma_test_ids[] = {
     { TB_SERVICE("dma_test", 1) },
     { },
 };
 MODULE_DEVICE_TABLE(tbsvc, dma_test_ids);
 
 static struct tb_service_driver dma_test_driver = {
     .driver = {
         .owner = THIS_MODULE,
         .name = "thunderbolt_dma_test",
         .pm = &dma_test_pm_ops,
     },
     .probe = dma_test_probe,
     .remove = dma_test_remove,
     .id_table = dma_test_ids,
 };
 
 static int __init dma_test_init(void)
 {
     u64 data_value = DMA_TEST_DATA_PATTERN;
     int i, ret;
 
     dma_test_pattern = kmalloc(DMA_TEST_FRAME_SIZE, GFP_KERNEL);
     if (!dma_test_pattern)
         return -ENOMEM;
 
     for (i = 0; i < DMA_TEST_FRAME_SIZE / sizeof(data_value); i++)
         ((u32 *)dma_test_pattern)[i] = data_value++;
 
     dma_test_dir = tb_property_create_dir(&dma_test_dir_uuid);
     if (!dma_test_dir) {
         ret = -ENOMEM;
         goto err_free_pattern;
     }
 
     tb_property_add_immediate(dma_test_dir, "prtcid", 1);
     tb_property_add_immediate(dma_test_dir, "prtcvers", 1);
     tb_property_add_immediate(dma_test_dir, "prtcrevs", 0);
     tb_property_add_immediate(dma_test_dir, "prtcstns", 0);
 
     ret = tb_register_property_dir("dma_test", dma_test_dir);
     if (ret)
         goto err_free_dir;
 
     ret = tb_register_service_driver(&dma_test_driver);
     if (ret)
         goto err_unregister_dir;
 
     return 0;
 
 err_unregister_dir:
     tb_unregister_property_dir("dma_test", dma_test_dir);
 err_free_dir:
     tb_property_free_dir(dma_test_dir);
 err_free_pattern:
     kfree(dma_test_pattern);
 
     return ret;
 }
 module_init(dma_test_init);
 
 static void __exit dma_test_exit(void)
 {
     tb_unregister_service_driver(&dma_test_driver);
     tb_unregister_property_dir("dma_test", dma_test_dir);
     tb_property_free_dir(dma_test_dir);
     kfree(dma_test_pattern);
 }
 module_exit(dma_test_exit);
 
 MODULE_AUTHOR("Isaac Hazan <isaac.hazan@intel.com>");
 MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");
 MODULE_DESCRIPTION("DMA traffic test driver");
 MODULE_LICENSE("GPL v2");

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