Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linuxgrafted

Pull I3C updates from Alexandre Belloni:
 "A new driver this cycle, for the AMD AXI I3C controller.

  There are also new features such as IBI wakeup support, SETAASA device
  discovery and ACPI support for the the DAA methods, meaning we can now
  communicate with the SPD devices on DDR5 modules.

  New driver:
   - AMD AXI I3C master controller

  Subsystem:
   - I3C Common Command Code (CCC) handling improvements, especially
     around GET CCCs
   - SETAASA device discovery support
   - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as
     well as I2C devices on I3C bus
   - IBI-based wakeup support

  Drivers:
   - dw: SETAASA support
   - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C
     controller support, PIO queue management support for HCI v1.2
   - renesas: improve suspend to RAM support, add runtime PM support"

* tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits)
  i3c: dw: reduce do_daa time if there's no client
  i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller
  i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2
  i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode
  i3c: dw: rename "pclk" to "apb" to match dt-binding
  i3c: dw: make struct dw_i3c_cmd smaller
  i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding
  i3c: renesas: Don't register devices when ENTDAA times out
  i3c: master: dw-i3c-master: fix OD timing for first broadcast
  i3c: mipi-i3c-hci: Advertise IBI wakeup capability
  i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev()
  i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI
  i3c: master: Reject IBI requests from non-IBI-capable devices
  i3c: master: Add helper to query bus wakeup requirements
  i3c: master: Report wakeup events for IBIs
  i3c: master: Support IBI-based wakeup capability
  i3c: master: Fix potential UAF in i3c_device_match()
  i3c: master: Fix potential UAF in i3c_device_uevent()
  i3c: Make dev->desc locking assumptions explicit
  i3c: master: Fix use-after-free of master->this
  ...

1 files changed, 205 insertions, 0 deletions

diff --git a/net/lapb/lapb_out.c b/net/lapb/lapb_out.c
new file mode 100644
index 000000000..a966d29c7
--- /dev/null
+++ b/net/lapb/lapb_out.c
@@ -0,0 +1,205 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *	LAPB release 002
+ *
+ *	This code REQUIRES 2.1.15 or higher/ NET3.038
+ *
+ *	History
+ *	LAPB 001	Jonathan Naylor	Started Coding
+ *	LAPB 002	Jonathan Naylor	New timer architecture.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/kernel.h>
+#include <linux/timer.h>
+#include <linux/string.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <linux/inet.h>
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+#include <net/sock.h>
+#include <linux/uaccess.h>
+#include <linux/fcntl.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <net/lapb.h>
+
+/*
+ *  This procedure is passed a buffer descriptor for an iframe. It builds
+ *  the rest of the control part of the frame and then writes it out.
+ */
+static void lapb_send_iframe(struct lapb_cb *lapb, struct sk_buff *skb, int poll_bit)
+{
+	unsigned char *frame;
+
+	if (!skb)
+		return;
+
+	if (lapb->mode & LAPB_EXTENDED) {
+		frame = skb_push(skb, 2);
+
+		frame[0] = LAPB_I;
+		frame[0] |= lapb->vs << 1;
+		frame[1] = poll_bit ? LAPB_EPF : 0;
+		frame[1] |= lapb->vr << 1;
+	} else {
+		frame = skb_push(skb, 1);
+
+		*frame = LAPB_I;
+		*frame |= poll_bit ? LAPB_SPF : 0;
+		*frame |= lapb->vr << 5;
+		*frame |= lapb->vs << 1;
+	}
+
+	lapb_dbg(1, "(%p) S%d TX I(%d) S%d R%d\n",
+		 lapb->dev, lapb->state, poll_bit, lapb->vs, lapb->vr);
+
+	lapb_transmit_buffer(lapb, skb, LAPB_COMMAND);
+}
+
+void lapb_kick(struct lapb_cb *lapb)
+{
+	struct sk_buff *skb, *skbn;
+	unsigned short modulus, start, end;
+
+	modulus = (lapb->mode & LAPB_EXTENDED) ? LAPB_EMODULUS : LAPB_SMODULUS;
+	start = !skb_peek(&lapb->ack_queue) ? lapb->va : lapb->vs;
+	end   = (lapb->va + lapb->window) % modulus;
+
+	if (!(lapb->condition & LAPB_PEER_RX_BUSY_CONDITION) &&
+	    start != end && skb_peek(&lapb->write_queue)) {
+		lapb->vs = start;
+
+		/*
+		 * Dequeue the frame and copy it.
+		 */
+		skb = skb_dequeue(&lapb->write_queue);
+
+		do {
+			skbn = skb_copy(skb, GFP_ATOMIC);
+			if (!skbn) {
+				skb_queue_head(&lapb->write_queue, skb);
+				break;
+			}
+
+			if (skb->sk)
+				skb_set_owner_w(skbn, skb->sk);
+
+			/*
+			 * Transmit the frame copy.
+			 */
+			lapb_send_iframe(lapb, skbn, LAPB_POLLOFF);
+
+			lapb->vs = (lapb->vs + 1) % modulus;
+
+			/*
+			 * Requeue the original data frame.
+			 */
+			skb_queue_tail(&lapb->ack_queue, skb);
+
+		} while (lapb->vs != end && (skb = skb_dequeue(&lapb->write_queue)) != NULL);
+
+		lapb->condition &= ~LAPB_ACK_PENDING_CONDITION;
+
+		if (!lapb_t1timer_running(lapb))
+			lapb_start_t1timer(lapb);
+	}
+}
+
+void lapb_transmit_buffer(struct lapb_cb *lapb, struct sk_buff *skb, int type)
+{
+	unsigned char *ptr;
+
+	ptr = skb_push(skb, 1);
+
+	if (lapb->mode & LAPB_MLP) {
+		if (lapb->mode & LAPB_DCE) {
+			if (type == LAPB_COMMAND)
+				*ptr = LAPB_ADDR_C;
+			if (type == LAPB_RESPONSE)
+				*ptr = LAPB_ADDR_D;
+		} else {
+			if (type == LAPB_COMMAND)
+				*ptr = LAPB_ADDR_D;
+			if (type == LAPB_RESPONSE)
+				*ptr = LAPB_ADDR_C;
+		}
+	} else {
+		if (lapb->mode & LAPB_DCE) {
+			if (type == LAPB_COMMAND)
+				*ptr = LAPB_ADDR_A;
+			if (type == LAPB_RESPONSE)
+				*ptr = LAPB_ADDR_B;
+		} else {
+			if (type == LAPB_COMMAND)
+				*ptr = LAPB_ADDR_B;
+			if (type == LAPB_RESPONSE)
+				*ptr = LAPB_ADDR_A;
+		}
+	}
+
+	lapb_dbg(2, "(%p) S%d TX %3ph\n", lapb->dev, lapb->state, skb->data);
+
+	if (!lapb_data_transmit(lapb, skb))
+		kfree_skb(skb);
+}
+
+void lapb_establish_data_link(struct lapb_cb *lapb)
+{
+	lapb->condition = 0x00;
+	lapb->n2count   = 0;
+
+	if (lapb->mode & LAPB_EXTENDED) {
+		lapb_dbg(1, "(%p) S%d TX SABME(1)\n", lapb->dev, lapb->state);
+		lapb_send_control(lapb, LAPB_SABME, LAPB_POLLON, LAPB_COMMAND);
+	} else {
+		lapb_dbg(1, "(%p) S%d TX SABM(1)\n", lapb->dev, lapb->state);
+		lapb_send_control(lapb, LAPB_SABM, LAPB_POLLON, LAPB_COMMAND);
+	}
+
+	lapb_start_t1timer(lapb);
+	lapb_stop_t2timer(lapb);
+}
+
+void lapb_enquiry_response(struct lapb_cb *lapb)
+{
+	lapb_dbg(1, "(%p) S%d TX RR(1) R%d\n",
+		 lapb->dev, lapb->state, lapb->vr);
+
+	lapb_send_control(lapb, LAPB_RR, LAPB_POLLON, LAPB_RESPONSE);
+
+	lapb->condition &= ~LAPB_ACK_PENDING_CONDITION;
+}
+
+void lapb_timeout_response(struct lapb_cb *lapb)
+{
+	lapb_dbg(1, "(%p) S%d TX RR(0) R%d\n",
+		 lapb->dev, lapb->state, lapb->vr);
+	lapb_send_control(lapb, LAPB_RR, LAPB_POLLOFF, LAPB_RESPONSE);
+
+	lapb->condition &= ~LAPB_ACK_PENDING_CONDITION;
+}
+
+void lapb_check_iframes_acked(struct lapb_cb *lapb, unsigned short nr)
+{
+	if (lapb->vs == nr) {
+		lapb_frames_acked(lapb, nr);
+		lapb_stop_t1timer(lapb);
+		lapb->n2count = 0;
+	} else if (lapb->va != nr) {
+		lapb_frames_acked(lapb, nr);
+		lapb_start_t1timer(lapb);
+	}
+}
+
+void lapb_check_need_response(struct lapb_cb *lapb, int type, int pf)
+{
+	if (type == LAPB_COMMAND && pf)
+		lapb_enquiry_response(lapb);
+}