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, 127 insertions, 0 deletions

diff --git a/drivers/net/pcs/pcs-xpcs.h b/drivers/net/pcs/pcs-xpcs.h
new file mode 100644
index 000000000..929fa2384
--- /dev/null
+++ b/drivers/net/pcs/pcs-xpcs.h
@@ -0,0 +1,127 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2020 Synopsys, Inc. and/or its affiliates.
+ * Synopsys DesignWare XPCS helpers
+ *
+ * Author: Jose Abreu <Jose.Abreu@synopsys.com>
+ */
+
+#include <linux/bits.h>
+#include <linux/pcs/pcs-xpcs.h>
+
+/* Vendor regs access */
+#define DW_VENDOR			BIT(15)
+
+/* VR_XS_PCS */
+#define DW_USXGMII_RST			BIT(10)
+#define DW_USXGMII_EN			BIT(9)
+#define DW_VR_XS_PCS_DIG_CTRL1		0x0000
+#define DW_VR_RST			BIT(15)
+#define DW_EN_VSMMD1			BIT(13)
+#define DW_CL37_BP			BIT(12)
+#define DW_VR_XS_PCS_DIG_STS		0x0010
+#define DW_RXFIFO_ERR			GENMASK(6, 5)
+#define DW_PSEQ_ST			GENMASK(4, 2)
+#define DW_PSEQ_ST_GOOD			FIELD_PREP(GENMASK(4, 2), 0x4)
+
+/* SR_MII */
+#define DW_USXGMII_FULL			BIT(8)
+#define DW_USXGMII_SS_MASK		(BIT(13) | BIT(6) | BIT(5))
+#define DW_USXGMII_10000		(BIT(13) | BIT(6))
+#define DW_USXGMII_5000			(BIT(13) | BIT(5))
+#define DW_USXGMII_2500			(BIT(5))
+#define DW_USXGMII_1000			(BIT(6))
+#define DW_USXGMII_100			(BIT(13))
+#define DW_USXGMII_10			(0)
+
+/* SR_AN */
+#define DW_SR_AN_ADV1			0x10
+#define DW_SR_AN_ADV2			0x11
+#define DW_SR_AN_ADV3			0x12
+
+/* Clause 73 Defines */
+/* AN_LP_ABL1 */
+#define DW_C73_PAUSE			BIT(10)
+#define DW_C73_ASYM_PAUSE		BIT(11)
+#define DW_C73_AN_ADV_SF		0x1
+/* AN_LP_ABL2 */
+#define DW_C73_1000KX			BIT(5)
+#define DW_C73_10000KX4			BIT(6)
+#define DW_C73_10000KR			BIT(7)
+/* AN_LP_ABL3 */
+#define DW_C73_2500KX			BIT(0)
+#define DW_C73_5000KR			BIT(1)
+
+/* Clause 37 Defines */
+/* VR MII MMD registers offsets */
+#define DW_VR_MII_DIG_CTRL1		0x8000
+#define DW_VR_MII_DIG_CTRL1_MAC_AUTO_SW		BIT(9)
+#define DW_VR_MII_DIG_CTRL1_2G5_EN		BIT(2)
+#define DW_VR_MII_DIG_CTRL1_PHY_MODE_CTRL	BIT(0)
+
+#define DW_VR_MII_AN_CTRL		0x8001
+#define DW_VR_MII_AN_CTRL_8BIT			BIT(8)
+#define DW_VR_MII_TX_CONFIG_MASK		BIT(3)
+#define DW_VR_MII_TX_CONFIG_PHY_SIDE_SGMII	0x1
+#define DW_VR_MII_TX_CONFIG_MAC_SIDE_SGMII	0x0
+#define DW_VR_MII_PCS_MODE_MASK			GENMASK(2, 1)
+#define DW_VR_MII_PCS_MODE_C37_1000BASEX	0x0
+#define DW_VR_MII_PCS_MODE_C37_SGMII		0x2
+#define DW_VR_MII_AN_INTR_EN			BIT(0)
+
+#define DW_VR_MII_AN_INTR_STS		0x8002
+#define DW_VR_MII_AN_STS_C37_ANCMPLT_INTR	BIT(0)
+#define DW_VR_MII_AN_STS_C37_ANSGM_FD		BIT(1)
+#define DW_VR_MII_AN_STS_C37_ANSGM_SP		GENMASK(3, 2)
+#define DW_VR_MII_C37_ANSGM_SP_10		0x0
+#define DW_VR_MII_C37_ANSGM_SP_100		0x1
+#define DW_VR_MII_C37_ANSGM_SP_1000		0x2
+#define DW_VR_MII_C37_ANSGM_SP_LNKSTS		BIT(4)
+
+#define DW_VR_MII_EEE_MCTRL0		0x8006
+#define DW_VR_MII_EEE_LTX_EN			BIT(0)  /* LPI Tx Enable */
+#define DW_VR_MII_EEE_LRX_EN			BIT(1)  /* LPI Rx Enable */
+#define DW_VR_MII_EEE_TX_QUIET_EN		BIT(2)  /* Tx Quiet Enable */
+#define DW_VR_MII_EEE_RX_QUIET_EN		BIT(3)  /* Rx Quiet Enable */
+#define DW_VR_MII_EEE_TX_EN_CTRL		BIT(4)  /* Tx Control Enable */
+#define DW_VR_MII_EEE_RX_EN_CTRL		BIT(7)  /* Rx Control Enable */
+#define DW_VR_MII_EEE_MULT_FACT_100NS		GENMASK(11, 8)
+
+#define DW_VR_MII_EEE_MCTRL1		0x800b
+#define DW_VR_MII_EEE_TRN_LPI		BIT(0)	/* Transparent Mode Enable */
+
+#define DW_VR_MII_DIG_CTRL2		0x80e1
+#define DW_VR_MII_DIG_CTRL2_TX_POL_INV		BIT(4)
+#define DW_VR_MII_DIG_CTRL2_RX_POL_INV		BIT(0)
+
+#define DW_XPCS_INFO_DECLARE(_name, _pcs, _pma)				\
+	static const struct dw_xpcs_info _name = { .pcs = _pcs, .pma = _pma }
+
+struct dw_xpcs_desc;
+
+enum dw_xpcs_clock {
+	DW_XPCS_CORE_CLK,
+	DW_XPCS_PAD_CLK,
+	DW_XPCS_NUM_CLKS,
+};
+
+struct dw_xpcs {
+	struct dw_xpcs_info info;
+	const struct dw_xpcs_desc *desc;
+	struct mdio_device *mdiodev;
+	struct clk_bulk_data clks[DW_XPCS_NUM_CLKS];
+	struct phylink_pcs pcs;
+	phy_interface_t interface;
+	bool need_reset;
+	u8 eee_mult_fact;
+};
+
+int xpcs_read(struct dw_xpcs *xpcs, int dev, u32 reg);
+int xpcs_write(struct dw_xpcs *xpcs, int dev, u32 reg, u16 val);
+int xpcs_modify(struct dw_xpcs *xpcs, int dev, u32 reg, u16 mask, u16 set);
+int xpcs_read_vpcs(struct dw_xpcs *xpcs, int reg);
+int xpcs_write_vpcs(struct dw_xpcs *xpcs, int reg, u16 val);
+int nxp_sja1105_sgmii_pma_config(struct dw_xpcs *xpcs);
+int nxp_sja1110_sgmii_pma_config(struct dw_xpcs *xpcs);
+int nxp_sja1110_2500basex_pma_config(struct dw_xpcs *xpcs);
+int txgbe_xpcs_switch_mode(struct dw_xpcs *xpcs, phy_interface_t interface);