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

3 files changed, 313 insertions, 0 deletions

diff --git a/drivers/phy/sunplus/Kconfig b/drivers/phy/sunplus/Kconfig
new file mode 100644
index 000000000..3bd3cfb53
--- /dev/null
+++ b/drivers/phy/sunplus/Kconfig
@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+config PHY_SUNPLUS_USB
+	tristate "Sunplus SP7021 USB 2.0 PHY driver"
+	depends on OF && (SOC_SP7021 || COMPILE_TEST)
+	select GENERIC_PHY
+	help
+	  Enable this to support the USB 2.0 PHY on Sunplus SP7021
+	  SoC. The USB 2.0 PHY controller supports battery charger
+	  and synchronous signals, various power down modes including
+	  operating, partial and suspend modes, and high-speed,
+	  full-speed and low-speed data transfer.
diff --git a/drivers/phy/sunplus/Makefile b/drivers/phy/sunplus/Makefile
new file mode 100644
index 000000000..71754d5cb
--- /dev/null
+++ b/drivers/phy/sunplus/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_PHY_SUNPLUS_USB)	+= phy-sunplus-usb2.o
diff --git a/drivers/phy/sunplus/phy-sunplus-usb2.c b/drivers/phy/sunplus/phy-sunplus-usb2.c
new file mode 100644
index 000000000..0ad4c7160
--- /dev/null
+++ b/drivers/phy/sunplus/phy-sunplus-usb2.c
@@ -0,0 +1,299 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * Sunplus SP7021 USB 2.0 phy driver
+ *
+ * Copyright (C) 2022 Sunplus Technology Inc., All rights reserved.
+ *
+ * Note 1 : non-posted write command for the registers accesses of
+ * Sunplus SP7021.
+ *
+ */
+
+#include <linux/bitfield.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/nvmem-consumer.h>
+#include <linux/of.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/reset.h>
+
+#define HIGH_MASK_BITS				GENMASK(31, 16)
+#define LOW_MASK_BITS				GENMASK(15, 0)
+#define OTP_DISC_LEVEL_DEFAULT			0xd
+
+/* GROUP UPHY */
+#define CONFIG1					0x4
+#define J_HS_TX_PWRSAV				BIT(5)
+#define CONFIG3					0xc
+#define J_FORCE_DISC_ON				BIT(5)
+#define J_DEBUG_CTRL_ADDR_MACRO			BIT(0)
+#define CONFIG7					0x1c
+#define J_DISC					0X1f
+#define CONFIG9					0x24
+#define J_ECO_PATH				BIT(6)
+#define CONFIG16				0x40
+#define J_TBCWAIT_MASK				GENMASK(6, 5)
+#define J_TBCWAIT_1P1_MS			FIELD_PREP(J_TBCWAIT_MASK, 0)
+#define J_TVDM_SRC_DIS_MASK			GENMASK(4, 3)
+#define J_TVDM_SRC_DIS_8P2_MS			FIELD_PREP(J_TVDM_SRC_DIS_MASK, 3)
+#define J_TVDM_SRC_EN_MASK			GENMASK(2, 1)
+#define J_TVDM_SRC_EN_1P6_MS			FIELD_PREP(J_TVDM_SRC_EN_MASK, 0)
+#define J_BC_EN					BIT(0)
+#define CONFIG17				0x44
+#define IBG_TRIM0_MASK				GENMASK(7, 5)
+#define IBG_TRIM0_SSLVHT			FIELD_PREP(IBG_TRIM0_MASK, 4)
+#define J_VDATREE_TRIM_MASK			GENMASK(4, 1)
+#define J_VDATREE_TRIM_DEFAULT			FIELD_PREP(J_VDATREE_TRIM_MASK, 9)
+#define CONFIG23				0x5c
+#define PROB_MASK				GENMASK(5, 3)
+#define PROB					FIELD_PREP(PROB_MASK, 7)
+
+/* GROUP MOON4 */
+#define UPHY_CONTROL0				0x0
+#define UPHY_CONTROL1				0x4
+#define UPHY_CONTROL2				0x8
+#define MO1_UPHY_RX_CLK_SEL			BIT(6)
+#define MASK_MO1_UPHY_RX_CLK_SEL		BIT(6 + 16)
+#define UPHY_CONTROL3				0xc
+#define MO1_UPHY_PLL_POWER_OFF_SEL		BIT(7)
+#define MASK_MO1_UPHY_PLL_POWER_OFF_SEL		BIT(7 + 16)
+#define MO1_UPHY_PLL_POWER_OFF			BIT(3)
+#define MASK_UPHY_PLL_POWER_OFF			BIT(3 + 16)
+
+struct sp_usbphy {
+	struct device *dev;
+	struct resource *phy_res_mem;
+	struct resource *moon4_res_mem;
+	struct reset_control *rstc;
+	struct clk *phy_clk;
+	void __iomem *phy_regs;
+	void __iomem *moon4_regs;
+	u32 disc_vol_addr_off;
+};
+
+static int update_disc_vol(struct sp_usbphy *usbphy)
+{
+	struct nvmem_cell *cell;
+	char *disc_name = "disc_vol";
+	ssize_t otp_l = 0;
+	char *otp_v;
+	u32 val, set;
+
+	cell = nvmem_cell_get(usbphy->dev, disc_name);
+	if (IS_ERR_OR_NULL(cell)) {
+		if (PTR_ERR(cell) == -EPROBE_DEFER)
+			return -EPROBE_DEFER;
+	}
+
+	otp_v = nvmem_cell_read(cell, &otp_l);
+	nvmem_cell_put(cell);
+
+	if (!IS_ERR(otp_v)) {
+		set = *(otp_v + 1);
+		set = (set << (sizeof(char) * 8)) | *otp_v;
+		set = (set >> usbphy->disc_vol_addr_off) & J_DISC;
+	}
+
+	if (IS_ERR(otp_v) || set == 0)
+		set = OTP_DISC_LEVEL_DEFAULT;
+
+	val = readl(usbphy->phy_regs + CONFIG7);
+	val = (val & ~J_DISC) | set;
+	writel(val, usbphy->phy_regs + CONFIG7);
+
+	return 0;
+}
+
+static int sp_uphy_init(struct phy *phy)
+{
+	struct sp_usbphy *usbphy = phy_get_drvdata(phy);
+	u32 val;
+	int ret;
+
+	ret = clk_prepare_enable(usbphy->phy_clk);
+	if (ret)
+		return ret;
+
+	ret = reset_control_deassert(usbphy->rstc);
+	if (ret)
+		goto err_clk;
+
+	/* Default value modification */
+	writel(HIGH_MASK_BITS | 0x4002, usbphy->moon4_regs + UPHY_CONTROL0);
+	writel(HIGH_MASK_BITS | 0x8747, usbphy->moon4_regs + UPHY_CONTROL1);
+
+	/* disconnect voltage */
+	ret = update_disc_vol(usbphy);
+	if (ret < 0)
+		goto err_reset;
+
+	/* board uphy 0 internal register modification for tid certification */
+	val = readl(usbphy->phy_regs + CONFIG9);
+	val &= ~(J_ECO_PATH);
+	writel(val, usbphy->phy_regs + CONFIG9);
+
+	val = readl(usbphy->phy_regs + CONFIG1);
+	val &= ~(J_HS_TX_PWRSAV);
+	writel(val, usbphy->phy_regs + CONFIG1);
+
+	val = readl(usbphy->phy_regs + CONFIG23);
+	val = (val & ~PROB) | PROB;
+	writel(val, usbphy->phy_regs + CONFIG23);
+
+	/* port 0 uphy clk fix */
+	writel(MASK_MO1_UPHY_RX_CLK_SEL | MO1_UPHY_RX_CLK_SEL,
+	       usbphy->moon4_regs + UPHY_CONTROL2);
+
+	/* battery charger */
+	writel(J_TBCWAIT_1P1_MS | J_TVDM_SRC_DIS_8P2_MS | J_TVDM_SRC_EN_1P6_MS | J_BC_EN,
+	       usbphy->phy_regs + CONFIG16);
+	writel(IBG_TRIM0_SSLVHT | J_VDATREE_TRIM_DEFAULT, usbphy->phy_regs + CONFIG17);
+
+	/* chirp mode */
+	writel(J_FORCE_DISC_ON | J_DEBUG_CTRL_ADDR_MACRO, usbphy->phy_regs + CONFIG3);
+
+	return 0;
+
+err_reset:
+	reset_control_assert(usbphy->rstc);
+err_clk:
+	clk_disable_unprepare(usbphy->phy_clk);
+
+	return ret;
+}
+
+static int sp_uphy_power_on(struct phy *phy)
+{
+	struct sp_usbphy *usbphy = phy_get_drvdata(phy);
+	u32 pll_pwr_on, pll_pwr_off;
+
+	/* PLL power off/on twice */
+	pll_pwr_off = (readl(usbphy->moon4_regs + UPHY_CONTROL3) & ~LOW_MASK_BITS)
+			| MO1_UPHY_PLL_POWER_OFF_SEL | MO1_UPHY_PLL_POWER_OFF;
+	pll_pwr_on = (readl(usbphy->moon4_regs + UPHY_CONTROL3) & ~LOW_MASK_BITS)
+			| MO1_UPHY_PLL_POWER_OFF_SEL;
+
+	writel(MASK_MO1_UPHY_PLL_POWER_OFF_SEL | MASK_UPHY_PLL_POWER_OFF | pll_pwr_off,
+	       usbphy->moon4_regs + UPHY_CONTROL3);
+	mdelay(1);
+	writel(MASK_MO1_UPHY_PLL_POWER_OFF_SEL | MASK_UPHY_PLL_POWER_OFF | pll_pwr_on,
+	       usbphy->moon4_regs + UPHY_CONTROL3);
+	mdelay(1);
+	writel(MASK_MO1_UPHY_PLL_POWER_OFF_SEL | MASK_UPHY_PLL_POWER_OFF | pll_pwr_off,
+	       usbphy->moon4_regs + UPHY_CONTROL3);
+	mdelay(1);
+	writel(MASK_MO1_UPHY_PLL_POWER_OFF_SEL | MASK_UPHY_PLL_POWER_OFF | pll_pwr_on,
+	       usbphy->moon4_regs + UPHY_CONTROL3);
+	mdelay(1);
+	writel(MASK_MO1_UPHY_PLL_POWER_OFF_SEL | MASK_UPHY_PLL_POWER_OFF | 0x0,
+	       usbphy->moon4_regs + UPHY_CONTROL3);
+
+	return 0;
+}
+
+static int sp_uphy_power_off(struct phy *phy)
+{
+	struct sp_usbphy *usbphy = phy_get_drvdata(phy);
+	u32 pll_pwr_off;
+
+	pll_pwr_off = (readl(usbphy->moon4_regs + UPHY_CONTROL3) & ~LOW_MASK_BITS)
+			| MO1_UPHY_PLL_POWER_OFF_SEL | MO1_UPHY_PLL_POWER_OFF;
+
+	writel(MASK_MO1_UPHY_PLL_POWER_OFF_SEL | MASK_UPHY_PLL_POWER_OFF | pll_pwr_off,
+	       usbphy->moon4_regs + UPHY_CONTROL3);
+	mdelay(1);
+	writel(MASK_MO1_UPHY_PLL_POWER_OFF_SEL | MASK_UPHY_PLL_POWER_OFF | 0x0,
+	       usbphy->moon4_regs + UPHY_CONTROL3);
+
+	return 0;
+}
+
+static int sp_uphy_exit(struct phy *phy)
+{
+	struct sp_usbphy *usbphy = phy_get_drvdata(phy);
+
+	reset_control_assert(usbphy->rstc);
+	clk_disable_unprepare(usbphy->phy_clk);
+
+	return 0;
+}
+
+static const struct phy_ops sp_uphy_ops = {
+	.init		= sp_uphy_init,
+	.power_on	= sp_uphy_power_on,
+	.power_off	= sp_uphy_power_off,
+	.exit		= sp_uphy_exit,
+};
+
+static const struct of_device_id sp_uphy_dt_ids[] = {
+	{.compatible = "sunplus,sp7021-usb2-phy", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, sp_uphy_dt_ids);
+
+static int sp_usb_phy_probe(struct platform_device *pdev)
+{
+	struct sp_usbphy *usbphy;
+	struct phy_provider *phy_provider;
+	struct phy *phy;
+	int ret;
+
+	usbphy = devm_kzalloc(&pdev->dev, sizeof(*usbphy), GFP_KERNEL);
+	if (!usbphy)
+		return -ENOMEM;
+
+	usbphy->dev = &pdev->dev;
+
+	usbphy->phy_res_mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy");
+	usbphy->phy_regs = devm_ioremap_resource(&pdev->dev, usbphy->phy_res_mem);
+	if (IS_ERR(usbphy->phy_regs))
+		return PTR_ERR(usbphy->phy_regs);
+
+	usbphy->moon4_res_mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, "moon4");
+	if (!usbphy->moon4_res_mem)
+		return -EINVAL;
+
+	usbphy->moon4_regs = devm_ioremap(&pdev->dev, usbphy->moon4_res_mem->start,
+					  resource_size(usbphy->moon4_res_mem));
+	if (!usbphy->moon4_regs)
+		return -ENOMEM;
+
+	usbphy->phy_clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(usbphy->phy_clk))
+		return PTR_ERR(usbphy->phy_clk);
+
+	usbphy->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);
+	if (IS_ERR(usbphy->rstc))
+		return PTR_ERR(usbphy->rstc);
+
+	of_property_read_u32(pdev->dev.of_node, "sunplus,disc-vol-addr-off",
+			     &usbphy->disc_vol_addr_off);
+
+	phy = devm_phy_create(&pdev->dev, NULL, &sp_uphy_ops);
+	if (IS_ERR(phy)) {
+		ret = PTR_ERR(phy);
+		return ret;
+	}
+
+	phy_set_drvdata(phy, usbphy);
+	phy_provider = devm_of_phy_provider_register(&pdev->dev, of_phy_simple_xlate);
+
+	return PTR_ERR_OR_ZERO(phy_provider);
+}
+
+static struct platform_driver sunplus_usb_phy_driver = {
+	.probe		= sp_usb_phy_probe,
+	.driver		= {
+		.name	= "sunplus-usb2-phy",
+		.of_match_table = sp_uphy_dt_ids,
+	},
+};
+module_platform_driver(sunplus_usb_phy_driver);
+
+MODULE_AUTHOR("Vincent Shih <vincent.shih@sunplus.com>");
+MODULE_DESCRIPTION("Sunplus USB 2.0 phy driver");
+MODULE_LICENSE("GPL");