forked from Minki/linux
edc0f494ed
This driver allows sending DMA traffic over XDomain connection. Specifically over a loopback connection using either a Thunderbolt/USB4 cable that is connected back to the host router port, or a special loopback dongle that has RX and TX lines crossed. This can be useful at manufacturing floor to check whether Thunderbolt/USB4 ports are functional. The driver exposes debugfs directory under the XDomain service that can be used to configure the driver, start the test and check the results. If a loopback dongle is used the steps to send and receive 1000 packets can be done like: # modprobe thunderbolt_dma_test # echo 1000 > /sys/kernel/debug/thunderbolt/<service_id>/dma_test/packets_to_receive # echo 1000 > /sys/kernel/debug/thunderbolt/<service_id>/dma_test/packets_to_send # echo 1 > /sys/kernel/debug/thunderbolt/<service_id>/dma_test/test # cat /sys/kernel/debug/thunderbolt/<service_id>/dma_test/status When a cable is connected back to host then there are two Thunderbolt services, one is configured for receiving (does not matter which one): # modprobe thunderbolt_dma_test # echo 1000 > /sys/kernel/debug/thunderbolt/<service_a>/dma_test/packets_to_receive # echo 1 > /sys/kernel/debug/thunderbolt/<service_a>/dma_test/test The other one for sending: # echo 1000 > /sys/kernel/debug/thunderbolt/<service_b>/dma_test/packets_to_send # echo 1 > /sys/kernel/debug/thunderbolt/<service_b>/dma_test/test Results can be read from both services status attributes. Signed-off-by: Isaac Hazan <isaac.hazan@intel.com> Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Acked-by: Yehezkel Bernat <YehezkelShB@gmail.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
737 lines
18 KiB
C
737 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* DMA traffic test driver
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*
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* Copyright (C) 2020, Intel Corporation
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* Authors: Isaac Hazan <isaac.hazan@intel.com>
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* Mika Westerberg <mika.westerberg@linux.intel.com>
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*/
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#include <linux/acpi.h>
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#include <linux/completion.h>
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#include <linux/debugfs.h>
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#include <linux/module.h>
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#include <linux/sizes.h>
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#include <linux/thunderbolt.h>
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#define DMA_TEST_HOPID 8
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#define DMA_TEST_TX_RING_SIZE 64
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#define DMA_TEST_RX_RING_SIZE 256
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#define DMA_TEST_FRAME_SIZE SZ_4K
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#define DMA_TEST_DATA_PATTERN 0x0123456789abcdefLL
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#define DMA_TEST_MAX_PACKETS 1000
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enum dma_test_frame_pdf {
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DMA_TEST_PDF_FRAME_START = 1,
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DMA_TEST_PDF_FRAME_END,
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};
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struct dma_test_frame {
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struct dma_test *dma_test;
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void *data;
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struct ring_frame frame;
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};
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enum dma_test_test_error {
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DMA_TEST_NO_ERROR,
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DMA_TEST_INTERRUPTED,
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DMA_TEST_BUFFER_ERROR,
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DMA_TEST_DMA_ERROR,
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DMA_TEST_CONFIG_ERROR,
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DMA_TEST_SPEED_ERROR,
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DMA_TEST_WIDTH_ERROR,
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DMA_TEST_BONDING_ERROR,
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DMA_TEST_PACKET_ERROR,
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};
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static const char * const dma_test_error_names[] = {
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[DMA_TEST_NO_ERROR] = "no errors",
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[DMA_TEST_INTERRUPTED] = "interrupted by signal",
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[DMA_TEST_BUFFER_ERROR] = "no memory for packet buffers",
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[DMA_TEST_DMA_ERROR] = "DMA ring setup failed",
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[DMA_TEST_CONFIG_ERROR] = "configuration is not valid",
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[DMA_TEST_SPEED_ERROR] = "unexpected link speed",
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[DMA_TEST_WIDTH_ERROR] = "unexpected link width",
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[DMA_TEST_BONDING_ERROR] = "lane bonding configuration error",
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[DMA_TEST_PACKET_ERROR] = "packet check failed",
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};
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enum dma_test_result {
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DMA_TEST_NOT_RUN,
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DMA_TEST_SUCCESS,
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DMA_TEST_FAIL,
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};
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static const char * const dma_test_result_names[] = {
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[DMA_TEST_NOT_RUN] = "not run",
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[DMA_TEST_SUCCESS] = "success",
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[DMA_TEST_FAIL] = "failed",
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};
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/**
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* struct dma_test - DMA test device driver private data
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* @svc: XDomain service the driver is bound to
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* @xd: XDomain the service belongs to
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* @rx_ring: Software ring holding RX frames
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* @tx_ring: Software ring holding TX frames
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* @packets_to_send: Number of packets to send
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* @packets_to_receive: Number of packets to receive
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* @packets_sent: Actual number of packets sent
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* @packets_received: Actual number of packets received
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* @link_speed: Expected link speed (Gb/s), %0 to use whatever is negotiated
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* @link_width: Expected link width (Gb/s), %0 to use whatever is negotiated
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* @crc_errors: Number of CRC errors during the test run
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* @buffer_overflow_errors: Number of buffer overflow errors during the test
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* run
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* @result: Result of the last run
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* @error_code: Error code of the last run
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* @complete: Used to wait for the Rx to complete
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* @lock: Lock serializing access to this structure
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* @debugfs_dir: dentry of this dma_test
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*/
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struct dma_test {
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const struct tb_service *svc;
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struct tb_xdomain *xd;
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struct tb_ring *rx_ring;
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struct tb_ring *tx_ring;
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unsigned int packets_to_send;
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unsigned int packets_to_receive;
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unsigned int packets_sent;
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unsigned int packets_received;
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unsigned int link_speed;
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unsigned int link_width;
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unsigned int crc_errors;
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unsigned int buffer_overflow_errors;
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enum dma_test_result result;
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enum dma_test_test_error error_code;
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struct completion complete;
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struct mutex lock;
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struct dentry *debugfs_dir;
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};
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/* DMA test property directory UUID: 3188cd10-6523-4a5a-a682-fdca07a248d8 */
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static const uuid_t dma_test_dir_uuid =
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UUID_INIT(0x3188cd10, 0x6523, 0x4a5a,
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0xa6, 0x82, 0xfd, 0xca, 0x07, 0xa2, 0x48, 0xd8);
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static struct tb_property_dir *dma_test_dir;
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static void *dma_test_pattern;
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static void dma_test_free_rings(struct dma_test *dt)
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{
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if (dt->rx_ring) {
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tb_ring_free(dt->rx_ring);
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dt->rx_ring = NULL;
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}
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if (dt->tx_ring) {
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tb_ring_free(dt->tx_ring);
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dt->tx_ring = NULL;
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}
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}
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static int dma_test_start_rings(struct dma_test *dt)
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{
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unsigned int flags = RING_FLAG_FRAME;
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struct tb_xdomain *xd = dt->xd;
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int ret, e2e_tx_hop = 0;
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struct tb_ring *ring;
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/*
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* If we are both sender and receiver (traffic goes over a
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* special loopback dongle) enable E2E flow control. This avoids
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* losing packets.
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*/
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if (dt->packets_to_send && dt->packets_to_receive)
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flags |= RING_FLAG_E2E;
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if (dt->packets_to_send) {
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ring = tb_ring_alloc_tx(xd->tb->nhi, -1, DMA_TEST_TX_RING_SIZE,
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flags);
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if (!ring)
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return -ENOMEM;
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dt->tx_ring = ring;
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e2e_tx_hop = ring->hop;
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}
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if (dt->packets_to_receive) {
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u16 sof_mask, eof_mask;
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sof_mask = BIT(DMA_TEST_PDF_FRAME_START);
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eof_mask = BIT(DMA_TEST_PDF_FRAME_END);
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ring = tb_ring_alloc_rx(xd->tb->nhi, -1, DMA_TEST_RX_RING_SIZE,
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flags, e2e_tx_hop, sof_mask, eof_mask,
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NULL, NULL);
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if (!ring) {
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dma_test_free_rings(dt);
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return -ENOMEM;
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}
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dt->rx_ring = ring;
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}
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ret = tb_xdomain_enable_paths(dt->xd, DMA_TEST_HOPID,
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dt->tx_ring ? dt->tx_ring->hop : 0,
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DMA_TEST_HOPID,
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dt->rx_ring ? dt->rx_ring->hop : 0);
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if (ret) {
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dma_test_free_rings(dt);
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return ret;
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}
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if (dt->tx_ring)
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tb_ring_start(dt->tx_ring);
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if (dt->rx_ring)
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tb_ring_start(dt->rx_ring);
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return 0;
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}
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static void dma_test_stop_rings(struct dma_test *dt)
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{
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if (dt->rx_ring)
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tb_ring_stop(dt->rx_ring);
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if (dt->tx_ring)
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tb_ring_stop(dt->tx_ring);
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if (tb_xdomain_disable_paths(dt->xd))
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dev_warn(&dt->svc->dev, "failed to disable DMA paths\n");
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dma_test_free_rings(dt);
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}
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static void dma_test_rx_callback(struct tb_ring *ring, struct ring_frame *frame,
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bool canceled)
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{
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struct dma_test_frame *tf = container_of(frame, typeof(*tf), frame);
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struct dma_test *dt = tf->dma_test;
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struct device *dma_dev = tb_ring_dma_device(dt->rx_ring);
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dma_unmap_single(dma_dev, tf->frame.buffer_phy, DMA_TEST_FRAME_SIZE,
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DMA_FROM_DEVICE);
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kfree(tf->data);
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if (canceled) {
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kfree(tf);
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return;
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}
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dt->packets_received++;
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dev_dbg(&dt->svc->dev, "packet %u/%u received\n", dt->packets_received,
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dt->packets_to_receive);
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if (tf->frame.flags & RING_DESC_CRC_ERROR)
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dt->crc_errors++;
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if (tf->frame.flags & RING_DESC_BUFFER_OVERRUN)
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dt->buffer_overflow_errors++;
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kfree(tf);
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if (dt->packets_received == dt->packets_to_receive)
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complete(&dt->complete);
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}
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static int dma_test_submit_rx(struct dma_test *dt, size_t npackets)
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{
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struct device *dma_dev = tb_ring_dma_device(dt->rx_ring);
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int i;
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for (i = 0; i < npackets; i++) {
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struct dma_test_frame *tf;
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dma_addr_t dma_addr;
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tf = kzalloc(sizeof(*tf), GFP_KERNEL);
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if (!tf)
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return -ENOMEM;
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tf->data = kzalloc(DMA_TEST_FRAME_SIZE, GFP_KERNEL);
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if (!tf->data) {
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kfree(tf);
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return -ENOMEM;
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}
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dma_addr = dma_map_single(dma_dev, tf->data, DMA_TEST_FRAME_SIZE,
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DMA_FROM_DEVICE);
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if (dma_mapping_error(dma_dev, dma_addr)) {
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kfree(tf->data);
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kfree(tf);
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return -ENOMEM;
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}
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tf->frame.buffer_phy = dma_addr;
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tf->frame.callback = dma_test_rx_callback;
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tf->dma_test = dt;
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INIT_LIST_HEAD(&tf->frame.list);
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tb_ring_rx(dt->rx_ring, &tf->frame);
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}
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return 0;
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}
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static void dma_test_tx_callback(struct tb_ring *ring, struct ring_frame *frame,
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bool canceled)
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{
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struct dma_test_frame *tf = container_of(frame, typeof(*tf), frame);
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struct dma_test *dt = tf->dma_test;
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struct device *dma_dev = tb_ring_dma_device(dt->tx_ring);
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dma_unmap_single(dma_dev, tf->frame.buffer_phy, DMA_TEST_FRAME_SIZE,
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DMA_TO_DEVICE);
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kfree(tf->data);
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kfree(tf);
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}
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static int dma_test_submit_tx(struct dma_test *dt, size_t npackets)
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{
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struct device *dma_dev = tb_ring_dma_device(dt->tx_ring);
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int i;
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for (i = 0; i < npackets; i++) {
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struct dma_test_frame *tf;
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dma_addr_t dma_addr;
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tf = kzalloc(sizeof(*tf), GFP_KERNEL);
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if (!tf)
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return -ENOMEM;
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tf->frame.size = 0; /* means 4096 */
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tf->dma_test = dt;
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tf->data = kzalloc(DMA_TEST_FRAME_SIZE, GFP_KERNEL);
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if (!tf->data) {
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kfree(tf);
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return -ENOMEM;
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}
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memcpy(tf->data, dma_test_pattern, DMA_TEST_FRAME_SIZE);
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dma_addr = dma_map_single(dma_dev, tf->data, DMA_TEST_FRAME_SIZE,
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DMA_TO_DEVICE);
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if (dma_mapping_error(dma_dev, dma_addr)) {
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kfree(tf->data);
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kfree(tf);
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return -ENOMEM;
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}
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tf->frame.buffer_phy = dma_addr;
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tf->frame.callback = dma_test_tx_callback;
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tf->frame.sof = DMA_TEST_PDF_FRAME_START;
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tf->frame.eof = DMA_TEST_PDF_FRAME_END;
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INIT_LIST_HEAD(&tf->frame.list);
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dt->packets_sent++;
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dev_dbg(&dt->svc->dev, "packet %u/%u sent\n", dt->packets_sent,
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dt->packets_to_send);
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tb_ring_tx(dt->tx_ring, &tf->frame);
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}
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return 0;
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}
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#define DMA_TEST_DEBUGFS_ATTR(__fops, __get, __validate, __set) \
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static int __fops ## _show(void *data, u64 *val) \
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{ \
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struct tb_service *svc = data; \
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struct dma_test *dt = tb_service_get_drvdata(svc); \
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int ret; \
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\
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ret = mutex_lock_interruptible(&dt->lock); \
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if (ret) \
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return ret; \
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__get(dt, val); \
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mutex_unlock(&dt->lock); \
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return 0; \
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} \
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static int __fops ## _store(void *data, u64 val) \
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{ \
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struct tb_service *svc = data; \
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struct dma_test *dt = tb_service_get_drvdata(svc); \
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int ret; \
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\
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ret = __validate(val); \
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if (ret) \
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return ret; \
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ret = mutex_lock_interruptible(&dt->lock); \
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if (ret) \
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return ret; \
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__set(dt, val); \
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mutex_unlock(&dt->lock); \
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return 0; \
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} \
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DEFINE_DEBUGFS_ATTRIBUTE(__fops ## _fops, __fops ## _show, \
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__fops ## _store, "%llu\n")
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static void lanes_get(const struct dma_test *dt, u64 *val)
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{
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*val = dt->link_width;
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}
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static int lanes_validate(u64 val)
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{
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return val > 2 ? -EINVAL : 0;
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}
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static void lanes_set(struct dma_test *dt, u64 val)
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{
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dt->link_width = val;
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}
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DMA_TEST_DEBUGFS_ATTR(lanes, lanes_get, lanes_validate, lanes_set);
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static void speed_get(const struct dma_test *dt, u64 *val)
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{
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*val = dt->link_speed;
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}
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static int speed_validate(u64 val)
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{
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switch (val) {
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case 20:
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case 10:
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case 0:
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return 0;
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default:
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return -EINVAL;
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}
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}
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static void speed_set(struct dma_test *dt, u64 val)
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{
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dt->link_speed = val;
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}
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DMA_TEST_DEBUGFS_ATTR(speed, speed_get, speed_validate, speed_set);
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static void packets_to_receive_get(const struct dma_test *dt, u64 *val)
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{
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*val = dt->packets_to_receive;
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}
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static int packets_to_receive_validate(u64 val)
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{
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return val > DMA_TEST_MAX_PACKETS ? -EINVAL : 0;
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}
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static void packets_to_receive_set(struct dma_test *dt, u64 val)
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{
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dt->packets_to_receive = val;
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}
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DMA_TEST_DEBUGFS_ATTR(packets_to_receive, packets_to_receive_get,
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packets_to_receive_validate, packets_to_receive_set);
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static void packets_to_send_get(const struct dma_test *dt, u64 *val)
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{
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*val = dt->packets_to_send;
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}
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static int packets_to_send_validate(u64 val)
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{
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return val > DMA_TEST_MAX_PACKETS ? -EINVAL : 0;
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}
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static void packets_to_send_set(struct dma_test *dt, u64 val)
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{
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dt->packets_to_send = val;
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}
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DMA_TEST_DEBUGFS_ATTR(packets_to_send, packets_to_send_get,
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packets_to_send_validate, packets_to_send_set);
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static int dma_test_set_bonding(struct dma_test *dt)
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{
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switch (dt->link_width) {
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case 2:
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return tb_xdomain_lane_bonding_enable(dt->xd);
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case 1:
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tb_xdomain_lane_bonding_disable(dt->xd);
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fallthrough;
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default:
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return 0;
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}
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}
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static bool dma_test_validate_config(struct dma_test *dt)
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{
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if (!dt->packets_to_send && !dt->packets_to_receive)
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return false;
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if (dt->packets_to_send && dt->packets_to_receive &&
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dt->packets_to_send != dt->packets_to_receive)
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return false;
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return true;
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}
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static void dma_test_check_errors(struct dma_test *dt, int ret)
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{
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if (!dt->error_code) {
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if (dt->link_speed && dt->xd->link_speed != dt->link_speed) {
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dt->error_code = DMA_TEST_SPEED_ERROR;
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} else if (dt->link_width &&
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dt->xd->link_width != dt->link_width) {
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dt->error_code = DMA_TEST_WIDTH_ERROR;
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} else if (dt->packets_to_send != dt->packets_sent ||
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dt->packets_to_receive != dt->packets_received ||
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dt->crc_errors || dt->buffer_overflow_errors) {
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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");
|