/* * Copyright 2012 Tilera Corporation. All Rights Reserved. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation, version 2. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or * NON INFRINGEMENT. See the GNU General Public License for * more details. */ /* * Tilera TILE-Gx USB EHCI host controller driver. */ #include #include #include #include #include #include #include static void tilegx_start_ehc(void) { } static void tilegx_stop_ehc(void) { } static int tilegx_ehci_setup(struct usb_hcd *hcd) { int ret = ehci_init(hcd); /* * Some drivers do: * * struct ehci_hcd *ehci = hcd_to_ehci(hcd); * ehci->need_io_watchdog = 0; * * here, but since this is a new driver we're going to leave the * watchdog enabled. Later we may try to turn it off and see * whether we run into any problems. */ return ret; } static const struct hc_driver ehci_tilegx_hc_driver = { .description = hcd_name, .product_desc = "Tile-Gx EHCI", .hcd_priv_size = sizeof(struct ehci_hcd), /* * Generic hardware linkage. */ .irq = ehci_irq, .flags = HCD_MEMORY | HCD_USB2 | HCD_BH, /* * Basic lifecycle operations. */ .reset = tilegx_ehci_setup, .start = ehci_run, .stop = ehci_stop, .shutdown = ehci_shutdown, /* * Managing I/O requests and associated device resources. */ .urb_enqueue = ehci_urb_enqueue, .urb_dequeue = ehci_urb_dequeue, .endpoint_disable = ehci_endpoint_disable, .endpoint_reset = ehci_endpoint_reset, /* * Scheduling support. */ .get_frame_number = ehci_get_frame, /* * Root hub support. */ .hub_status_data = ehci_hub_status_data, .hub_control = ehci_hub_control, .bus_suspend = ehci_bus_suspend, .bus_resume = ehci_bus_resume, .relinquish_port = ehci_relinquish_port, .port_handed_over = ehci_port_handed_over, .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, }; static int ehci_hcd_tilegx_drv_probe(struct platform_device *pdev) { struct usb_hcd *hcd; struct ehci_hcd *ehci; struct tilegx_usb_platform_data *pdata = dev_get_platdata(&pdev->dev); pte_t pte = { 0 }; int my_cpu = smp_processor_id(); int ret; if (usb_disabled()) return -ENODEV; /* * Try to initialize our GXIO context; if we can't, the device * doesn't exist. */ if (gxio_usb_host_init(&pdata->usb_ctx, pdata->dev_index, 1) != 0) return -ENXIO; hcd = usb_create_hcd(&ehci_tilegx_hc_driver, &pdev->dev, dev_name(&pdev->dev)); if (!hcd) { ret = -ENOMEM; goto err_hcd; } /* * We don't use rsrc_start to map in our registers, but seems like * we ought to set it to something, so we use the register VA. */ hcd->rsrc_start = (ulong) gxio_usb_host_get_reg_start(&pdata->usb_ctx); hcd->rsrc_len = gxio_usb_host_get_reg_len(&pdata->usb_ctx); hcd->regs = gxio_usb_host_get_reg_start(&pdata->usb_ctx); tilegx_start_ehc(); ehci = hcd_to_ehci(hcd); ehci->caps = hcd->regs; ehci->regs = hcd->regs + HC_LENGTH(ehci, readl(&ehci->caps->hc_capbase)); /* cache this readonly data; minimize chip reads */ ehci->hcs_params = readl(&ehci->caps->hcs_params); /* Create our IRQs and register them. */ pdata->irq = irq_alloc_hwirq(-1); if (!pdata->irq) { ret = -ENXIO; goto err_no_irq; } tile_irq_activate(pdata->irq, TILE_IRQ_PERCPU); /* Configure interrupts. */ ret = gxio_usb_host_cfg_interrupt(&pdata->usb_ctx, cpu_x(my_cpu), cpu_y(my_cpu), KERNEL_PL, pdata->irq); if (ret) { ret = -ENXIO; goto err_have_irq; } /* Register all of our memory. */ pte = pte_set_home(pte, PAGE_HOME_HASH); ret = gxio_usb_host_register_client_memory(&pdata->usb_ctx, pte, 0); if (ret) { ret = -ENXIO; goto err_have_irq; } ret = usb_add_hcd(hcd, pdata->irq, IRQF_SHARED); if (ret == 0) { platform_set_drvdata(pdev, hcd); device_wakeup_enable(hcd->self.controller); return ret; } err_have_irq: irq_free_hwirq(pdata->irq); err_no_irq: tilegx_stop_ehc(); usb_put_hcd(hcd); err_hcd: gxio_usb_host_destroy(&pdata->usb_ctx); return ret; } static int ehci_hcd_tilegx_drv_remove(struct platform_device *pdev) { struct usb_hcd *hcd = platform_get_drvdata(pdev); struct tilegx_usb_platform_data *pdata = dev_get_platdata(&pdev->dev); usb_remove_hcd(hcd); usb_put_hcd(hcd); tilegx_stop_ehc(); gxio_usb_host_destroy(&pdata->usb_ctx); irq_free_hwirq(pdata->irq); return 0; } static void ehci_hcd_tilegx_drv_shutdown(struct platform_device *pdev) { usb_hcd_platform_shutdown(pdev); ehci_hcd_tilegx_drv_remove(pdev); } static struct platform_driver ehci_hcd_tilegx_driver = { .probe = ehci_hcd_tilegx_drv_probe, .remove = ehci_hcd_tilegx_drv_remove, .shutdown = ehci_hcd_tilegx_drv_shutdown, .driver = { .name = "tilegx-ehci", } }; MODULE_ALIAS("platform:tilegx-ehci"); mitterSteven Rostedt (VMware) <rostedt@goodmis.org>2017-01-31 09:13:49 -0500 commit79c6f448c8b79c321e4a1f31f98194e4f6b6cae7 (patch) tree370efda701f03cccf21e02bb1fdd3b852547d75c /drivers/usb/host/Kconfig parent0c744ea4f77d72b3dcebb7a8f2684633ec79be88 (diff)
tracing: Fix hwlat kthread migration
The hwlat tracer creates a kernel thread at start of the tracer. It is pinned to a single CPU and will move to the next CPU after each period of running. If the user modifies the migration thread's affinity, it will not change after that happens. The original code created the thread at the first instance it was called, but later was changed to destroy the thread after the tracer was finished, and would not be created until the next instance of the tracer was established. The code that initialized the affinity was only called on the initial instantiation of the tracer. After that, it was not initialized, and the previous affinity did not match the current newly created one, making it appear that the user modified the thread's affinity when it did not, and the thread failed to migrate again. Cc: stable@vger.kernel.org Fixes: 0330f7aa8ee6 ("tracing: Have hwlat trace migrate across tracing_cpumask CPUs") Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'drivers/usb/host/Kconfig')