/** * dwc3-exynos.c - Samsung EXYNOS DWC3 Specific Glue layer * * Copyright (c) 2012 Samsung Electronics Co., Ltd. * http://www.samsung.com * * Author: Anton Tikhomirov * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 of * the License as published by the Free Software Foundation. * * 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. See the * GNU General Public License for more details. */ #include #include #include #include #include #include #include #include #include #include struct dwc3_exynos { struct platform_device *usb2_phy; struct platform_device *usb3_phy; struct device *dev; struct clk *clk; struct clk *susp_clk; struct clk *axius_clk; struct regulator *vdd33; struct regulator *vdd10; }; static int dwc3_exynos_register_phys(struct dwc3_exynos *exynos) { struct usb_phy_generic_platform_data pdata; struct platform_device *pdev; int ret; memset(&pdata, 0x00, sizeof(pdata)); pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO); if (!pdev) return -ENOMEM; exynos->usb2_phy = pdev; pdata.type = USB_PHY_TYPE_USB2; pdata.gpio_reset = -1; ret = platform_device_add_data(exynos->usb2_phy, &pdata, sizeof(pdata)); if (ret) goto err1; pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO); if (!pdev) { ret = -ENOMEM; goto err1; } exynos->usb3_phy = pdev; pdata.type = USB_PHY_TYPE_USB3; ret = platform_device_add_data(exynos->usb3_phy, &pdata, sizeof(pdata)); if (ret) goto err2; ret = platform_device_add(exynos->usb2_phy); if (ret) goto err2; ret = platform_device_add(exynos->usb3_phy); if (ret) goto err3; return 0; err3: platform_device_del(exynos->usb2_phy); err2: platform_device_put(exynos->usb3_phy); err1: platform_device_put(exynos->usb2_phy); return ret; } static int dwc3_exynos_remove_child(struct device *dev, void *unused) { struct platform_device *pdev = to_platform_device(dev); platform_device_unregister(pdev); return 0; } static int dwc3_exynos_probe(struct platform_device *pdev) { struct dwc3_exynos *exynos; struct device *dev = &pdev->dev; struct device_node *node = dev->of_node; int ret; exynos = devm_kzalloc(dev, sizeof(*exynos), GFP_KERNEL); if (!exynos) return -ENOMEM; platform_set_drvdata(pdev, exynos); exynos->dev = dev; exynos->clk = devm_clk_get(dev, "usbdrd30"); if (IS_ERR(exynos->clk)) { dev_err(dev, "couldn't get clock\n"); return -EINVAL; } clk_prepare_enable(exynos->clk); exynos->susp_clk = devm_clk_get(dev, "usbdrd30_susp_clk"); if (IS_ERR(exynos->susp_clk)) { dev_info(dev, "no suspend clk specified\n"); exynos->susp_clk = NULL; } clk_prepare_enable(exynos->susp_clk); if (of_device_is_compatible(node, "samsung,exynos7-dwusb3")) { exynos->axius_clk = devm_clk_get(dev, "usbdrd30_axius_clk"); if (IS_ERR(exynos->axius_clk)) { dev_err(dev, "no AXI UpScaler clk specified\n"); ret = -ENODEV; goto axius_clk_err; } clk_prepare_enable(exynos->axius_clk); } else { exynos->axius_clk = NULL; } exynos->vdd33 = devm_regulator_get(dev, "vdd33"); if (IS_ERR(exynos->vdd33)) { ret = PTR_ERR(exynos->vdd33); goto err2; } ret = regulator_enable(exynos->vdd33); if (ret) { dev_err(dev, "Failed to enable VDD33 supply\n"); goto err2; } exynos->vdd10 = devm_regulator_get(dev, "vdd10"); if (IS_ERR(exynos->vdd10)) { ret = PTR_ERR(exynos->vdd10); goto err3; } ret = regulator_enable(exynos->vdd10); if (ret) { dev_err(dev, "Failed to enable VDD10 supply\n"); goto err3; } ret = dwc3_exynos_register_phys(exynos); if (ret) { dev_err(dev, "couldn't register PHYs\n"); goto err4; } if (node) { ret = of_platform_populate(node, NULL, NULL, dev); if (ret) { dev_err(dev, "failed to add dwc3 core\n"); goto err5; } } else { dev_err(dev, "no device node, failed to add dwc3 core\n"); ret = -ENODEV; goto err5; } return 0; err5: platform_device_unregister(exynos->usb2_phy); platform_device_unregister(exynos->usb3_phy); err4: regulator_disable(exynos->vdd10); err3: regulator_disable(exynos->vdd33); err2: clk_disable_unprepare(exynos->axius_clk); axius_clk_err: clk_disable_unprepare(exynos->susp_clk); clk_disable_unprepare(exynos->clk); return ret; } static int dwc3_exynos_remove(struct platform_device *pdev) { struct dwc3_exynos *exynos = platform_get_drvdata(pdev); device_for_each_child(&pdev->dev, NULL, dwc3_exynos_remove_child); platform_device_unregister(exynos->usb2_phy); platform_device_unregister(exynos->usb3_phy); clk_disable_unprepare(exynos->axius_clk); clk_disable_unprepare(exynos->susp_clk); clk_disable_unprepare(exynos->clk); regulator_disable(exynos->vdd33); regulator_disable(exynos->vdd10); return 0; } static const struct of_device_id exynos_dwc3_match[] = { { .compatible = "samsung,exynos5250-dwusb3" }, { .compatible = "samsung,exynos7-dwusb3" }, {}, }; MODULE_DEVICE_TABLE(of, exynos_dwc3_match); #ifdef CONFIG_PM_SLEEP static int dwc3_exynos_suspend(struct device *dev) { struct dwc3_exynos *exynos = dev_get_drvdata(dev); clk_disable(exynos->axius_clk); clk_disable(exynos->clk); regulator_disable(exynos->vdd33); regulator_disable(exynos->vdd10); return 0; } static int dwc3_exynos_resume(struct device *dev) { struct dwc3_exynos *exynos = dev_get_drvdata(dev); int ret; ret = regulator_enable(exynos->vdd33); if (ret) { dev_err(dev, "Failed to enable VDD33 supply\n"); return ret; } ret = regulator_enable(exynos->vdd10); if (ret) { dev_err(dev, "Failed to enable VDD10 supply\n"); return ret; } clk_enable(exynos->clk); clk_enable(exynos->axius_clk); /* runtime set active to reflect active state. */ pm_runtime_disable(dev); pm_runtime_set_active(dev); pm_runtime_enable(dev); return 0; } static const struct dev_pm_ops dwc3_exynos_dev_pm_ops = { SET_SYSTEM_SLEEP_PM_OPS(dwc3_exynos_suspend, dwc3_exynos_resume) }; #define DEV_PM_OPS (&dwc3_exynos_dev_pm_ops) #else #define DEV_PM_OPS NULL #endif /* CONFIG_PM_SLEEP */ static struct platform_driver dwc3_exynos_driver = { .probe = dwc3_exynos_probe, .remove = dwc3_exynos_remove, .driver = { .name = "exynos-dwc3", .of_match_table = exynos_dwc3_match, .pm = DEV_PM_OPS, }, }; module_platform_driver(dwc3_exynos_driver); MODULE_ALIAS("platform:exynos-dwc3"); MODULE_AUTHOR("Anton Tikhomirov "); MODULE_LICENSE("GPL v2"); MODULE_DESCRIPTION("DesignWare USB3 EXYNOS Glue Layer"); sumable PIO & MEM errors A non-resumable error from userspace is able to cause a kernel panic or trap loop due to the setup and handling of the queued traps once in the kernel. This patch series addresses both of these issues. The queues are fixed by simply zeroing the memory before use. PIO errors from userspace will result in a SIGBUS being sent to the user process. The MEM errors form userspace will result in a SIGKILL and also cause the offending pages to be claimed so they are no longer used in future tasks. SIGKILL is used to ensure that the process does not try to coredump and result in an attempt to read the memory again from within kernel space. Although there is a HV call to scrub the memory (mem_scrub), there is no easy way to guarantee that the real memory address(es) are not used by other tasks. Clearing the error with mem_scrub would zero the memory and cause the other processes to proceed with bad data. The handling of other non-resumable errors remain unchanged and will cause a panic. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/tipc/server.c')