Merge tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-tracegrafted

Pull tracing fixes from Steven Rostedt:

 - Fix error output of boot instance creation failure

   Currently if a boot instance creation fails, instead of printing out
   the name of the instance that failed, it prints "(null)". That is
   because it prints "cur_str" that had already been processed by
   strsep(). Print the saved name instead.

   While at it, print the error code of the failure.

 - Fix use-after-free for same named historgrams

   Histograms can be named so that they can be used in multiple events.
   But if the named histogram has a variable attached, the second event
   that uses the named histogram which duplicates it and needs to free
   the original after duplication leaves the old variable in place and
   still visible. If another histogram uses than variable, it will use
   the stale one which will try to reference the freed duplicate
   histogram and crash the kernel.

   Free the duplicate variables along with the duplicated histogram
   data.

 - Check return value of kthread_run() in event self test

   The events self tests uses a kthread for testing but does not check
   if it succeeded in creating a kthread. If the kthread creation were
   to fail, the code will still try to call kthread_stop() on the error
   returned.

 - Fix race between reading trace_pipe and updating subbuffer size

   If a user is reading the trace_pipe file at the same time they update
   the ring buffer sub-buffer size, can cause the trace_pipe read to
   read stale data. Add trace_access_lock() around updating the ring
   buffer sub-buffer size.

 - Fix eventfs_inode on failure path in creation of the events directory

   In the creation of the "events" directory, if after allocating the
   eventfs_inode a failure is detected, it calls cleanup_ei() which
   calls free_ei(). The free_ei() will test if eventfs_inode being freed
   has no children. It is a bug if it does. But on the failure case of
   the creation of the "events" directory, the children lists have not
   yet been initialized and the free will trigger a warning because
   list_empty() on an uninitialized list returns false.

   Move the initialization into init_ei() where it makes more sense and
   makes sure that a created eventfs_inode has its lists initialized
   upon creation.

 - Check return value of kthread_run() in ftrace direct sample code

   The sample code that shows how to use the ftrace direct calls does
   not test the return of kthread_run() to see if it succeeds. Return a
   failure if the kthread_run() doesn't succeed.

 - Clear user events state on fork in case of alloc failure

   On fork, the child gets a pointer to the parent's user events state.
   It makes a copy of it then updates the child's pointer to it. But if
   the allocation fails, the duplication function leaves the child with
   a pointer to its parent's descriptor. When the child cleans up its
   data, it will free the parent's descriptor while the parent is still
   using it.

   In the duplication function, set the child's user_event_mm to NULL
   before testing if the allocation succeeded, and when it exits it will
   not free the parent's descriptor.

 - Fix retry exhaustion in simple ring buffer reader swap

   simple_ring_buffer_swap_reader_page() starts with retry set to 8 and
   post-decrements it only after a failed link replacement. On the final
   attempt, a successful replacement leaves retry at zero, while a
   failed replacement leaves it at -1.

   But the check for success expects the retry value to be non-zero and
   exits with an error on zero. This is the opposite result. Fix it.

 - Fail nicely when the remote swap_reader_page() returns an error

   Currently, if the swap_reader_page() of a remote buffer fails, it
   triggers a WARN_ON_ONCE() and continues normally. Instead, have it
   exit with an error and a pr_warn() print instead of a full WARNING.

* tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  ring-buffer: Stop remote reader update when page swap fails
  tracing: Fix retry exhaustion in simple ring buffer reader swap
  tracing/user_events: Clear copied tracing state before fork duplication
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-modify
  eventfs: Initialize ei->children and ei->list in init_ei()
  tracing: Fix use-after-free in trace_pipe read on sub-buffer order change
  tracing: Fix crash passing ERR_PTR to kthread_stop()
  tracing: Fix use-after-free with same-name named triggers
  tracing: Fix logged instance name on creation failure

1 files changed, 499 insertions, 0 deletions

diff --git a/drivers/usb/host/bcma-hcd.c b/drivers/usb/host/bcma-hcd.c
new file mode 100644
index 000000000..519386255
--- /dev/null
+++ b/drivers/usb/host/bcma-hcd.c
@@ -0,0 +1,499 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Broadcom specific Advanced Microcontroller Bus
+ * Broadcom USB-core driver (BCMA bus glue)
+ *
+ * Copyright 2011-2015 Hauke Mehrtens <hauke@hauke-m.de>
+ * Copyright 2015 Felix Fietkau <nbd@openwrt.org>
+ *
+ * Based on ssb-ohci driver
+ * Copyright 2007 Michael Buesch <m@bues.ch>
+ *
+ * Derived from the OHCI-PCI driver
+ * Copyright 1999 Roman Weissgaerber
+ * Copyright 2000-2002 David Brownell
+ * Copyright 1999 Linus Torvalds
+ * Copyright 1999 Gregory P. Smith
+ *
+ * Derived from the USBcore related parts of Broadcom-SB
+ * Copyright 2005-2011 Broadcom Corporation
+ */
+#include <linux/bcma/bcma.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/usb/ehci_pdriver.h>
+#include <linux/usb/ohci_pdriver.h>
+
+MODULE_AUTHOR("Hauke Mehrtens");
+MODULE_DESCRIPTION("Common USB driver for BCMA Bus");
+MODULE_LICENSE("GPL");
+
+/* See BCMA_CLKCTLST_EXTRESREQ and BCMA_CLKCTLST_EXTRESST */
+#define USB_BCMA_CLKCTLST_USB_CLK_REQ			0x00000100
+
+struct bcma_hcd_device {
+	struct bcma_device *core;
+	struct platform_device *ehci_dev;
+	struct platform_device *ohci_dev;
+	struct gpio_desc *gpio_desc;
+};
+
+/* Wait for bitmask in a register to get set or cleared.
+ * timeout is in units of ten-microseconds.
+ */
+static int bcma_wait_bits(struct bcma_device *dev, u16 reg, u32 bitmask,
+			  int timeout)
+{
+	int i;
+	u32 val;
+
+	for (i = 0; i < timeout; i++) {
+		val = bcma_read32(dev, reg);
+		if ((val & bitmask) == bitmask)
+			return 0;
+		udelay(10);
+	}
+
+	return -ETIMEDOUT;
+}
+
+static void bcma_hcd_4716wa(struct bcma_device *dev)
+{
+#ifdef CONFIG_BCMA_DRIVER_MIPS
+	/* Work around for 4716 failures. */
+	if (dev->bus->chipinfo.id == 0x4716) {
+		u32 tmp;
+
+		tmp = bcma_cpu_clock(&dev->bus->drv_mips);
+		if (tmp >= 480000000)
+			tmp = 0x1846b; /* set CDR to 0x11(fast) */
+		else if (tmp == 453000000)
+			tmp = 0x1046b; /* set CDR to 0x10(slow) */
+		else
+			tmp = 0;
+
+		/* Change Shim mdio control reg to fix host not acking at
+		 * high frequencies
+		 */
+		if (tmp) {
+			bcma_write32(dev, 0x524, 0x1); /* write sel to enable */
+			udelay(500);
+
+			bcma_write32(dev, 0x524, tmp);
+			udelay(500);
+			bcma_write32(dev, 0x524, 0x4ab);
+			udelay(500);
+			bcma_read32(dev, 0x528);
+			bcma_write32(dev, 0x528, 0x80000000);
+		}
+	}
+#endif /* CONFIG_BCMA_DRIVER_MIPS */
+}
+
+/* based on arch/mips/brcm-boards/bcm947xx/pcibios.c */
+static void bcma_hcd_init_chip_mips(struct bcma_device *dev)
+{
+	u32 tmp;
+
+	/*
+	 * USB 2.0 special considerations:
+	 *
+	 * 1. Since the core supports both OHCI and EHCI functions, it must
+	 *    only be reset once.
+	 *
+	 * 2. In addition to the standard SI reset sequence, the Host Control
+	 *    Register must be programmed to bring the USB core and various
+	 *    phy components out of reset.
+	 */
+	if (!bcma_core_is_enabled(dev)) {
+		bcma_core_enable(dev, 0);
+		mdelay(10);
+		if (dev->id.rev >= 5) {
+			/* Enable Misc PLL */
+			tmp = bcma_read32(dev, 0x1e0);
+			tmp |= 0x100;
+			bcma_write32(dev, 0x1e0, tmp);
+			if (bcma_wait_bits(dev, 0x1e0, 1 << 24, 100))
+				printk(KERN_EMERG "Failed to enable misc PPL!\n");
+
+			/* Take out of resets */
+			bcma_write32(dev, 0x200, 0x4ff);
+			udelay(25);
+			bcma_write32(dev, 0x200, 0x6ff);
+			udelay(25);
+
+			/* Make sure digital and AFE are locked in USB PHY */
+			bcma_write32(dev, 0x524, 0x6b);
+			udelay(50);
+			tmp = bcma_read32(dev, 0x524);
+			udelay(50);
+			bcma_write32(dev, 0x524, 0xab);
+			udelay(50);
+			tmp = bcma_read32(dev, 0x524);
+			udelay(50);
+			bcma_write32(dev, 0x524, 0x2b);
+			udelay(50);
+			tmp = bcma_read32(dev, 0x524);
+			udelay(50);
+			bcma_write32(dev, 0x524, 0x10ab);
+			udelay(50);
+			tmp = bcma_read32(dev, 0x524);
+
+			if (bcma_wait_bits(dev, 0x528, 0xc000, 10000)) {
+				tmp = bcma_read32(dev, 0x528);
+				printk(KERN_EMERG
+				       "USB20H mdio_rddata 0x%08x\n", tmp);
+			}
+			bcma_write32(dev, 0x528, 0x80000000);
+			tmp = bcma_read32(dev, 0x314);
+			udelay(265);
+			bcma_write32(dev, 0x200, 0x7ff);
+			udelay(10);
+
+			/* Take USB and HSIC out of non-driving modes */
+			bcma_write32(dev, 0x510, 0);
+		} else {
+			bcma_write32(dev, 0x200, 0x7ff);
+
+			udelay(1);
+		}
+
+		bcma_hcd_4716wa(dev);
+	}
+}
+
+/*
+ * bcma_hcd_usb20_old_arm_init - Initialize old USB 2.0 controller on ARM
+ *
+ * Old USB 2.0 core is identified as BCMA_CORE_USB20_HOST and was introduced
+ * long before Northstar devices. It seems some cheaper chipsets like BCM53573
+ * still use it.
+ * Initialization of this old core differs between MIPS and ARM.
+ */
+static int bcma_hcd_usb20_old_arm_init(struct bcma_hcd_device *usb_dev)
+{
+	struct bcma_device *core = usb_dev->core;
+	struct device *dev = &core->dev;
+	struct bcma_device *pmu_core;
+
+	usleep_range(10000, 20000);
+	if (core->id.rev < 5)
+		return 0;
+
+	pmu_core = bcma_find_core(core->bus, BCMA_CORE_PMU);
+	if (!pmu_core) {
+		dev_err(dev, "Could not find PMU core\n");
+		return -ENOENT;
+	}
+
+	/* Take USB core out of reset */
+	bcma_awrite32(core, BCMA_IOCTL, BCMA_IOCTL_CLK | BCMA_IOCTL_FGC);
+	usleep_range(100, 200);
+	bcma_awrite32(core, BCMA_RESET_CTL, BCMA_RESET_CTL_RESET);
+	usleep_range(100, 200);
+	bcma_awrite32(core, BCMA_RESET_CTL, 0);
+	usleep_range(100, 200);
+	bcma_awrite32(core, BCMA_IOCTL, BCMA_IOCTL_CLK);
+	usleep_range(100, 200);
+
+	/* Enable Misc PLL */
+	bcma_write32(core, BCMA_CLKCTLST, BCMA_CLKCTLST_FORCEHT |
+					  BCMA_CLKCTLST_HQCLKREQ |
+					  USB_BCMA_CLKCTLST_USB_CLK_REQ);
+	usleep_range(100, 200);
+
+	bcma_write32(core, 0x510, 0xc7f85000);
+	bcma_write32(core, 0x510, 0xc7f85003);
+	usleep_range(300, 600);
+
+	/* Program USB PHY PLL parameters */
+	bcma_write32(pmu_core, BCMA_CC_PMU_PLLCTL_ADDR, 0x6);
+	bcma_write32(pmu_core, BCMA_CC_PMU_PLLCTL_DATA, 0x005360c1);
+	usleep_range(100, 200);
+	bcma_write32(pmu_core, BCMA_CC_PMU_PLLCTL_ADDR, 0x7);
+	bcma_write32(pmu_core, BCMA_CC_PMU_PLLCTL_DATA, 0x0);
+	usleep_range(100, 200);
+	bcma_set32(pmu_core, BCMA_CC_PMU_CTL, BCMA_CC_PMU_CTL_PLL_UPD);
+	usleep_range(100, 200);
+
+	bcma_write32(core, 0x510, 0x7f8d007);
+	udelay(1000);
+
+	/* Take controller out of reset */
+	bcma_write32(core, 0x200, 0x4ff);
+	usleep_range(25, 50);
+	bcma_write32(core, 0x200, 0x6ff);
+	usleep_range(25, 50);
+	bcma_write32(core, 0x200, 0x7ff);
+	usleep_range(25, 50);
+
+	of_platform_default_populate(dev->of_node, NULL, dev);
+
+	return 0;
+}
+
+static void bcma_hcd_usb20_ns_init_hc(struct bcma_device *dev)
+{
+	u32 val;
+
+	/* Set packet buffer OUT threshold */
+	val = bcma_read32(dev, 0x94);
+	val &= 0xffff;
+	val |= 0x80 << 16;
+	bcma_write32(dev, 0x94, val);
+
+	/* Enable break memory transfer */
+	val = bcma_read32(dev, 0x9c);
+	val |= 1;
+	bcma_write32(dev, 0x9c, val);
+
+	/*
+	 * Broadcom initializes PHY and then waits to ensure HC is ready to be
+	 * configured. In our case the order is reversed. We just initialized
+	 * controller and we let HCD initialize PHY, so let's wait (sleep) now.
+	 */
+	usleep_range(1000, 2000);
+}
+
+/*
+ * bcma_hcd_usb20_ns_init - Initialize Northstar USB 2.0 controller
+ */
+static int bcma_hcd_usb20_ns_init(struct bcma_hcd_device *bcma_hcd)
+{
+	struct bcma_device *core = bcma_hcd->core;
+	struct bcma_chipinfo *ci = &core->bus->chipinfo;
+	struct device *dev = &core->dev;
+
+	bcma_core_enable(core, 0);
+
+	if (ci->id == BCMA_CHIP_ID_BCM4707 ||
+	    ci->id == BCMA_CHIP_ID_BCM53018)
+		bcma_hcd_usb20_ns_init_hc(core);
+
+	of_platform_default_populate(dev->of_node, NULL, dev);
+
+	return 0;
+}
+
+static void bcma_hci_platform_power_gpio(struct bcma_device *dev, bool val)
+{
+	struct bcma_hcd_device *usb_dev = bcma_get_drvdata(dev);
+
+	if (!usb_dev->gpio_desc)
+		return;
+
+	gpiod_set_value(usb_dev->gpio_desc, val);
+}
+
+static const struct usb_ehci_pdata ehci_pdata = {
+};
+
+static const struct usb_ohci_pdata ohci_pdata = {
+};
+
+static struct platform_device *bcma_hcd_create_pdev(struct bcma_device *dev,
+						    const char *name, u32 addr,
+						    const void *data,
+						    size_t size)
+{
+	struct platform_device *hci_dev;
+	struct resource hci_res[2];
+	int ret;
+
+	memset(hci_res, 0, sizeof(hci_res));
+
+	hci_res[0].start = addr;
+	hci_res[0].end = hci_res[0].start + 0x1000 - 1;
+	hci_res[0].flags = IORESOURCE_MEM;
+
+	hci_res[1].start = dev->irq;
+	hci_res[1].flags = IORESOURCE_IRQ;
+
+	hci_dev = platform_device_alloc(name, 0);
+	if (!hci_dev)
+		return ERR_PTR(-ENOMEM);
+
+	hci_dev->dev.parent = &dev->dev;
+	hci_dev->dev.dma_mask = &hci_dev->dev.coherent_dma_mask;
+
+	ret = platform_device_add_resources(hci_dev, hci_res,
+					    ARRAY_SIZE(hci_res));
+	if (ret)
+		goto err_alloc;
+	if (data)
+		ret = platform_device_add_data(hci_dev, data, size);
+	if (ret)
+		goto err_alloc;
+	ret = platform_device_add(hci_dev);
+	if (ret)
+		goto err_alloc;
+
+	return hci_dev;
+
+err_alloc:
+	platform_device_put(hci_dev);
+	return ERR_PTR(ret);
+}
+
+static int bcma_hcd_usb20_init(struct bcma_hcd_device *usb_dev)
+{
+	struct bcma_device *dev = usb_dev->core;
+	struct bcma_chipinfo *chipinfo = &dev->bus->chipinfo;
+	u32 ohci_addr;
+	int err;
+
+	if (dma_set_mask_and_coherent(dev->dma_dev, DMA_BIT_MASK(32)))
+		return -EOPNOTSUPP;
+
+	bcma_hcd_init_chip_mips(dev);
+
+	/* In AI chips EHCI is addrspace 0, OHCI is 1 */
+	ohci_addr = dev->addr_s[0];
+	if ((chipinfo->id == BCMA_CHIP_ID_BCM5357 ||
+	     chipinfo->id == BCMA_CHIP_ID_BCM4749)
+	    && chipinfo->rev == 0)
+		ohci_addr = 0x18009000;
+
+	usb_dev->ohci_dev = bcma_hcd_create_pdev(dev, "ohci-platform",
+						 ohci_addr, &ohci_pdata,
+						 sizeof(ohci_pdata));
+	if (IS_ERR(usb_dev->ohci_dev))
+		return PTR_ERR(usb_dev->ohci_dev);
+
+	usb_dev->ehci_dev = bcma_hcd_create_pdev(dev, "ehci-platform",
+						 dev->addr, &ehci_pdata,
+						 sizeof(ehci_pdata));
+	if (IS_ERR(usb_dev->ehci_dev)) {
+		err = PTR_ERR(usb_dev->ehci_dev);
+		goto err_unregister_ohci_dev;
+	}
+
+	return 0;
+
+err_unregister_ohci_dev:
+	platform_device_unregister(usb_dev->ohci_dev);
+	return err;
+}
+
+static int bcma_hcd_usb30_init(struct bcma_hcd_device *bcma_hcd)
+{
+	struct bcma_device *core = bcma_hcd->core;
+	struct device *dev = &core->dev;
+
+	bcma_core_enable(core, 0);
+
+	of_platform_default_populate(dev->of_node, NULL, dev);
+
+	return 0;
+}
+
+static int bcma_hcd_probe(struct bcma_device *core)
+{
+	int err;
+	struct bcma_hcd_device *usb_dev;
+
+	/* TODO: Probably need checks here; is the core connected? */
+
+	usb_dev = devm_kzalloc(&core->dev, sizeof(struct bcma_hcd_device),
+			       GFP_KERNEL);
+	if (!usb_dev)
+		return -ENOMEM;
+	usb_dev->core = core;
+
+	usb_dev->gpio_desc = devm_gpiod_get_optional(&core->dev, "vcc",
+						     GPIOD_OUT_HIGH);
+	if (IS_ERR(usb_dev->gpio_desc))
+		return dev_err_probe(&core->dev, PTR_ERR(usb_dev->gpio_desc),
+				     "error obtaining VCC GPIO");
+
+	switch (core->id.id) {
+	case BCMA_CORE_USB20_HOST:
+		if (IS_ENABLED(CONFIG_ARM))
+			err = bcma_hcd_usb20_old_arm_init(usb_dev);
+		else if (IS_ENABLED(CONFIG_MIPS))
+			err = bcma_hcd_usb20_init(usb_dev);
+		else
+			err = -ENOTSUPP;
+		break;
+	case BCMA_CORE_NS_USB20:
+		err = bcma_hcd_usb20_ns_init(usb_dev);
+		break;
+	case BCMA_CORE_NS_USB30:
+		err = bcma_hcd_usb30_init(usb_dev);
+		break;
+	default:
+		return -ENODEV;
+	}
+	if (err)
+		return err;
+
+	bcma_set_drvdata(core, usb_dev);
+	return 0;
+}
+
+static void bcma_hcd_remove(struct bcma_device *dev)
+{
+	struct bcma_hcd_device *usb_dev = bcma_get_drvdata(dev);
+	struct platform_device *ohci_dev = usb_dev->ohci_dev;
+	struct platform_device *ehci_dev = usb_dev->ehci_dev;
+
+	if (ohci_dev)
+		platform_device_unregister(ohci_dev);
+	if (ehci_dev)
+		platform_device_unregister(ehci_dev);
+
+	bcma_core_disable(dev, 0);
+}
+
+static void bcma_hcd_shutdown(struct bcma_device *dev)
+{
+	bcma_hci_platform_power_gpio(dev, false);
+	bcma_core_disable(dev, 0);
+}
+
+#ifdef CONFIG_PM
+
+static int bcma_hcd_suspend(struct bcma_device *dev)
+{
+	bcma_hci_platform_power_gpio(dev, false);
+	bcma_core_disable(dev, 0);
+
+	return 0;
+}
+
+static int bcma_hcd_resume(struct bcma_device *dev)
+{
+	bcma_hci_platform_power_gpio(dev, true);
+	bcma_core_enable(dev, 0);
+
+	return 0;
+}
+
+#else /* !CONFIG_PM */
+#define bcma_hcd_suspend	NULL
+#define bcma_hcd_resume	NULL
+#endif /* CONFIG_PM */
+
+static const struct bcma_device_id bcma_hcd_table[] = {
+	BCMA_CORE(BCMA_MANUF_BCM, BCMA_CORE_USB20_HOST, BCMA_ANY_REV, BCMA_ANY_CLASS),
+	BCMA_CORE(BCMA_MANUF_BCM, BCMA_CORE_NS_USB20, BCMA_ANY_REV, BCMA_ANY_CLASS),
+	BCMA_CORE(BCMA_MANUF_BCM, BCMA_CORE_NS_USB30, BCMA_ANY_REV, BCMA_ANY_CLASS),
+	{},
+};
+MODULE_DEVICE_TABLE(bcma, bcma_hcd_table);
+
+static struct bcma_driver bcma_hcd_driver = {
+	.name		= KBUILD_MODNAME,
+	.id_table	= bcma_hcd_table,
+	.probe		= bcma_hcd_probe,
+	.remove		= bcma_hcd_remove,
+	.shutdown	= bcma_hcd_shutdown,
+	.suspend	= bcma_hcd_suspend,
+	.resume		= bcma_hcd_resume,
+};
+module_bcma_driver(bcma_hcd_driver);