Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted

Pull networking updates from Jakub Kicinski:
 "Core:

   - Add dedicated kmem_cache for typical/small skb->head, avoid having
     to access struct page at kfree time, and improve memory use.

   - Introduce sysctl to set default RPS configuration for new netdevs.

   - Define Netlink protocol specification format which can be used to
     describe messages used by each family and auto-generate parsers.
     Add tools for generating kernel data structures and uAPI headers.

   - Expose all net/core sysctls inside netns.

   - Remove 4s sleep in netpoll if carrier is instantly detected on
     boot.

   - Add configurable limit of MDB entries per port, and port-vlan.

   - Continue populating drop reasons throughout the stack.

   - Retire a handful of legacy Qdiscs and classifiers.

  Protocols:

   - Support IPv4 big TCP (TSO frames larger than 64kB).

   - Add IP_LOCAL_PORT_RANGE socket option, to control local port range
     on socket by socket basis.

   - Track and report in procfs number of MPTCP sockets used.

   - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path
     manager.

   - IPv6: don't check net.ipv6.route.max_size and rely on garbage
     collection to free memory (similarly to IPv4).

   - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986).

   - ICMP: add per-rate limit counters.

   - Add support for user scanning requests in ieee802154.

   - Remove static WEP support.

   - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate
     reporting.

   - WiFi 7 EHT channel puncturing support (client & AP).

  BPF:

   - Add a rbtree data structure following the "next-gen data structure"
     precedent set by recently added linked list, that is, by using
     kfunc + kptr instead of adding a new BPF map type.

   - Expose XDP hints via kfuncs with initial support for RX hash and
     timestamp metadata.

   - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to
     better support decap on GRE tunnel devices not operating in collect
     metadata.

   - Improve x86 JIT's codegen for PROBE_MEM runtime error checks.

   - Remove the need for trace_printk_lock for bpf_trace_printk and
     bpf_trace_vprintk helpers.

   - Extend libbpf's bpf_tracing.h support for tracing arguments of
     kprobes/uprobes and syscall as a special case.

   - Significantly reduce the search time for module symbols by
     livepatch and BPF.

   - Enable cpumasks to be used as kptrs, which is useful for tracing
     programs tracking which tasks end up running on which CPUs in
     different time intervals.

   - Add support for BPF trampoline on s390x and riscv64.

   - Add capability to export the XDP features supported by the NIC.

   - Add __bpf_kfunc tag for marking kernel functions as kfuncs.

   - Add cgroup.memory=nobpf kernel parameter option to disable BPF
     memory accounting for container environments.

  Netfilter:

   - Remove the CLUSTERIP target. It has been marked as obsolete for
     years, and we still have WARN splats wrt races of the out-of-band
     /proc interface installed by this target.

   - Add 'destroy' commands to nf_tables. They are identical to the
     existing 'delete' commands, but do not return an error if the
     referenced object (set, chain, rule...) did not exist.

  Driver API:

   - Improve cpumask_local_spread() locality to help NICs set the right
     IRQ affinity on AMD platforms.

   - Separate C22 and C45 MDIO bus transactions more clearly.

   - Introduce new DCB table to control DSCP rewrite on egress.

   - Support configuration of Physical Layer Collision Avoidance (PLCA)
     Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of
     shared medium Ethernet.

   - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing
     preemption of low priority frames by high priority frames.

   - Add support for controlling MACSec offload using netlink SET.

   - Rework devlink instance refcounts to allow registration and
     de-registration under the instance lock. Split the code into
     multiple files, drop some of the unnecessarily granular locks and
     factor out common parts of netlink operation handling.

   - Add TX frame aggregation parameters (for USB drivers).

   - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning
     messages with notifications for debug.

   - Allow offloading of UDP NEW connections via act_ct.

   - Add support for per action HW stats in TC.

   - Support hardware miss to TC action (continue processing in SW from
     a specific point in the action chain).

   - Warn if old Wireless Extension user space interface is used with
     modern cfg80211/mac80211 drivers. Do not support Wireless
     Extensions for Wi-Fi 7 devices at all. Everyone should switch to
     using nl80211 interface instead.

   - Improve the CAN bit timing configuration. Use extack to return
     error messages directly to user space, update the SJW handling,
     including the definition of a new default value that will benefit
     CAN-FD controllers, by increasing their oscillator tolerance.

  New hardware / drivers:

   - Ethernet:
      - nVidia BlueField-3 support (control traffic driver)
      - Ethernet support for imx93 SoCs
      - Motorcomm yt8531 gigabit Ethernet PHY
      - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA)
      - Microchip LAN8841 PHY (incl. cable diagnostics and PTP)
      - Amlogic gxl MDIO mux

   - WiFi:
      - RealTek RTL8188EU (rtl8xxxu)
      - Qualcomm Wi-Fi 7 devices (ath12k)

   - CAN:
      - Renesas R-Car V4H

  Drivers:

   - Bluetooth:
      - Set Per Platform Antenna Gain (PPAG) for Intel controllers.

   - Ethernet NICs:
      - Intel (1G, igc):
         - support TSN / Qbv / packet scheduling features of i226 model
      - Intel (100G, ice):
         - use GNSS subsystem instead of TTY
         - multi-buffer XDP support
         - extend support for GPIO pins to E823 devices
      - nVidia/Mellanox:
         - update the shared buffer configuration on PFC commands
         - implement PTP adjphase function for HW offset control
         - TC support for Geneve and GRE with VF tunnel offload
         - more efficient crypto key management method
         - multi-port eswitch support
      - Netronome/Corigine:
         - add DCB IEEE support
         - support IPsec offloading for NFP3800
      - Freescale/NXP (enetc):
         - support XDP_REDIRECT for XDP non-linear buffers
         - improve reconfig, avoid link flap and waiting for idle
         - support MAC Merge layer
      - Other NICs:
         - sfc/ef100: add basic devlink support for ef100
         - ionic: rx_push mode operation (writing descriptors via MMIO)
         - bnxt: use the auxiliary bus abstraction for RDMA
         - r8169: disable ASPM and reset bus in case of tx timeout
         - cpsw: support QSGMII mode for J721e CPSW9G
         - cpts: support pulse-per-second output
         - ngbe: add an mdio bus driver
         - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing
         - r8152: handle devices with FW with NCM support
         - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation
         - virtio-net: support multi buffer XDP
         - virtio/vsock: replace virtio_vsock_pkt with sk_buff
         - tsnep: XDP support

   - Ethernet high-speed switches:
      - nVidia/Mellanox (mlxsw):
         - add support for latency TLV (in FW control messages)
      - Microchip (sparx5):
         - separate explicit and implicit traffic forwarding rules, make
           the implicit rules always active
         - add support for egress DSCP rewrite
         - IS0 VCAP support (Ingress Classification)
         - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS
           etc.)
         - ES2 VCAP support (Egress Access Control)
         - support for Per-Stream Filtering and Policing (802.1Q,
           8.6.5.1)

   - Ethernet embedded switches:
      - Marvell (mv88e6xxx):
         - add MAB (port auth) offload support
         - enable PTP receive for mv88e6390
      - NXP (ocelot):
         - support MAC Merge layer
         - support for the the vsc7512 internal copper phys
      - Microchip:
         - lan9303: convert to PHYLINK
         - lan966x: support TC flower filter statistics
         - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x
         - lan937x: support Credit Based Shaper configuration
         - ksz9477: support Energy Efficient Ethernet
      - other:
         - qca8k: convert to regmap read/write API, use bulk operations
         - rswitch: Improve TX timestamp accuracy

   - Intel WiFi (iwlwifi):
      - EHT (Wi-Fi 7) rate reporting
      - STEP equalizer support: transfer some STEP (connection to radio
        on platforms with integrated wifi) related parameters from the
        BIOS to the firmware.

   - Qualcomm 802.11ax WiFi (ath11k):
      - IPQ5018 support
      - Fine Timing Measurement (FTM) responder role support
      - channel 177 support

   - MediaTek WiFi (mt76):
      - per-PHY LED support
      - mt7996: EHT (Wi-Fi 7) support
      - Wireless Ethernet Dispatch (WED) reset support
      - switch to using page pool allocator

   - RealTek WiFi (rtw89):
      - support new version of Bluetooth co-existance

   - Mobile:
      - rmnet: support TX aggregation"

* tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits)
  page_pool: add a comment explaining the fragment counter usage
  net: ethtool: fix __ethtool_dev_mm_supported() implementation
  ethtool: pse-pd: Fix double word in comments
  xsk: add linux/vmalloc.h to xsk.c
  sefltests: netdevsim: wait for devlink instance after netns removal
  selftest: fib_tests: Always cleanup before exit
  net/mlx5e: Align IPsec ASO result memory to be as required by hardware
  net/mlx5e: TC, Set CT miss to the specific ct action instance
  net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG
  net/mlx5: Refactor tc miss handling to a single function
  net/mlx5: Kconfig: Make tc offload depend on tc skb extension
  net/sched: flower: Support hardware miss to tc action
  net/sched: flower: Move filter handle initialization earlier
  net/sched: cls_api: Support hardware miss to tc action
  net/sched: Rename user cookie and act cookie
  sfc: fix builds without CONFIG_RTC_LIB
  sfc: clean up some inconsistent indentings
  net/mlx4_en: Introduce flexible array to silence overflow warning
  net: lan966x: Fix possible deadlock inside PTP
  net/ulp: Remove redundant ->clone() test in inet_clone_ulp().
  ...

1 files changed, 639 insertions, 0 deletions

diff --git a/drivers/gpu/drm/tests/drm_damage_helper_test.c b/drivers/gpu/drm/tests/drm_damage_helper_test.c
new file mode 100644
index 000000000..115034fc3
--- /dev/null
+++ b/drivers/gpu/drm/tests/drm_damage_helper_test.c
@@ -0,0 +1,639 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Test case for drm_damage_helper functions
+ *
+ * Copyright (c) 2022 Maíra Canal <mairacanal@riseup.net>
+ */
+
+#include <kunit/test.h>
+
+#include <drm/drm_damage_helper.h>
+#include <drm/drm_framebuffer.h>
+#include <drm/drm_plane.h>
+#include <drm/drm_drv.h>
+
+struct drm_damage_mock {
+	struct drm_driver driver;
+	struct drm_device device;
+	struct drm_object_properties obj_props;
+	struct drm_plane plane;
+	struct drm_property prop;
+	struct drm_framebuffer fb;
+	struct drm_plane_state state;
+	struct drm_plane_state old_state;
+};
+
+static int drm_damage_helper_init(struct kunit *test)
+{
+	struct drm_damage_mock *mock;
+
+	mock = kunit_kzalloc(test, sizeof(*mock), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, mock);
+
+	mock->fb.width = 2048;
+	mock->fb.height = 2048;
+
+	mock->state.crtc = ZERO_SIZE_PTR;
+	mock->state.fb = &mock->fb;
+	mock->state.visible = true;
+
+	mock->old_state.plane = &mock->plane;
+	mock->state.plane = &mock->plane;
+
+	/* just enough so that drm_plane_enable_fb_damage_clips() works */
+	mock->device.driver = &mock->driver;
+	mock->device.mode_config.prop_fb_damage_clips = &mock->prop;
+	mock->plane.dev = &mock->device;
+	mock->obj_props.count = 0;
+	mock->plane.base.properties = &mock->obj_props;
+	mock->prop.base.id = 1; /* 0 is an invalid id */
+	mock->prop.dev = &mock->device;
+
+	drm_plane_enable_fb_damage_clips(&mock->plane);
+
+	test->priv = mock;
+
+	return 0;
+}
+
+static void set_plane_src(struct drm_plane_state *state, int x1, int y1, int x2,
+			  int y2)
+{
+	state->src_x = x1;
+	state->src_y = y1;
+	state->src_w = x2 - x1;
+	state->src_h = y2 - y1;
+
+	state->src.x1 = x1;
+	state->src.y1 = y1;
+	state->src.x2 = x2;
+	state->src.y2 = y2;
+}
+
+static void set_damage_clip(struct drm_mode_rect *r, int x1, int y1, int x2,
+			    int y2)
+{
+	r->x1 = x1;
+	r->y1 = y1;
+	r->x2 = x2;
+	r->y2 = y2;
+}
+
+static void set_damage_blob(struct drm_property_blob *damage_blob,
+			    struct drm_mode_rect *r, u32 size)
+{
+	damage_blob->length = size;
+	damage_blob->data = r;
+}
+
+static void set_plane_damage(struct drm_plane_state *state,
+			     struct drm_property_blob *damage_blob)
+{
+	state->fb_damage_clips = damage_blob;
+}
+
+static void check_damage_clip(struct kunit *test, struct drm_rect *r,
+			      int x1, int y1, int x2, int y2)
+{
+	struct drm_damage_mock *mock = test->priv;
+	struct drm_plane_state state = mock->state;
+
+	/*
+	 * Round down x1/y1 and round up x2/y2. This is because damage is not in
+	 * 16.16 fixed point so to catch all pixels.
+	 */
+	int src_x1 = state.src.x1 >> 16;
+	int src_y1 = state.src.y1 >> 16;
+	int src_x2 = (state.src.x2 >> 16) + !!(state.src.x2 & 0xFFFF);
+	int src_y2 = (state.src.y2 >> 16) + !!(state.src.y2 & 0xFFFF);
+
+	if (x1 >= x2 || y1 >= y2)
+		KUNIT_FAIL(test, "Cannot have damage clip with no dimension.");
+	if (x1 < src_x1 || y1 < src_y1 || x2 > src_x2 || y2 > src_y2)
+		KUNIT_FAIL(test, "Damage cannot be outside rounded plane src.");
+	if (r->x1 != x1 || r->y1 != y1 || r->x2 != x2 || r->y2 != y2)
+		KUNIT_FAIL(test, "Damage = %d %d %d %d, want = %d %d %d %d",
+			   r->x1, r->y1, r->x2, r->y2, x1, y1, x2, y2);
+}
+
+static void drm_test_damage_iter_no_damage(struct kunit *test)
+{
+	struct drm_damage_mock *mock = test->priv;
+	struct drm_atomic_helper_damage_iter iter;
+	struct drm_rect clip;
+	u32 num_hits = 0;
+
+	/* Plane src same as fb size. */
+	set_plane_src(&mock->old_state, 0, 0, mock->fb.width << 16, mock->fb.height << 16);
+	set_plane_src(&mock->state, 0, 0, mock->fb.width << 16, mock->fb.height << 16);
+	drm_atomic_helper_damage_iter_init(&iter, &mock->old_state, &mock->state);
+	drm_atomic_for_each_plane_damage(&iter, &clip)
+		num_hits++;
+
+	KUNIT_EXPECT_EQ_MSG(test, num_hits, 1, "Should return plane src as damage.");
+	check_damage_clip(test, &clip, 0, 0, 2048, 2048);
+}
+
+static void drm_test_damage_iter_no_damage_fractional_src(struct kunit *test)
+{
+	struct drm_damage_mock *mock = test->priv;
+	struct drm_atomic_helper_damage_iter iter;
+	struct drm_rect clip;
+	u32 num_hits = 0;
+
+	/* Plane src has fractional part. */
+	set_plane_src(&mock->old_state, 0x3fffe, 0x3fffe,
+		      0x3fffe + (1024 << 16), 0x3fffe + (768 << 16));
+	set_plane_src(&mock->state, 0x3fffe, 0x3fffe,
+		      0x3fffe + (1024 << 16), 0x3fffe + (768 << 16));
+	drm_atomic_helper_damage_iter_init(&iter, &mock->old_state, &mock->state);
+	drm_atomic_for_each_plane_damage(&iter, &clip)
+		num_hits++;
+
+	KUNIT_EXPECT_EQ_MSG(test, num_hits, 1,
+			    "Should return rounded off plane src as damage.");
+	check_damage_clip(test, &clip, 3, 3, 1028, 772);
+}
+
+static void drm_test_damage_iter_no_damage_src_moved(struct kunit *test)
+{
+	struct drm_damage_mock *mock = test->priv;
+	struct drm_atomic_helper_damage_iter iter;
+	struct drm_rect clip;
+	u32 num_hits = 0;
+
+	/* Plane src moved since old plane state. */
+	set_plane_src(&mock->old_state, 0, 0, 1024 << 16, 768 << 16);
+	set_plane_src(&mock->state, 10 << 16, 10 << 16,
+		      (10 + 1024) << 16, (10 + 768) << 16);
+	drm_atomic_helper_damage_iter_init(&iter, &mock->old_state, &mock->state);
+	drm_atomic_for_each_plane_damage(&iter, &clip)
+		num_hits++;
+
+	KUNIT_EXPECT_EQ_MSG(test, num_hits, 1, "Should return plane src as damage.");
+	check_damage_clip(test, &clip, 10, 10, 1034, 778);
+}
+
+static void drm_test_damage_iter_no_damage_fractional_src_moved(struct kunit *test)
+{
+	struct drm_damage_mock *mock = test->priv;
+	struct drm_atomic_helper_damage_iter iter;
+	struct drm_rect clip;
+	u32 num_hits = 0;
+
+	/* Plane src has fractional part and it moved since old plane state. */
+	set_plane_src(&mock->old_state, 0x3fffe, 0x3fffe,
+		      0x3fffe + (1024 << 16), 0x3fffe + (768 << 16));
+	set_plane_src(&mock->state, 0x40002, 0x40002,
+		      0x40002 + (1024 << 16), 0x40002 + (768 << 16));
+	drm_atomic_helper_damage_iter_init(&iter, &mock->old_state, &mock->state);
+	drm_atomic_for_each_plane_damage(&iter, &clip)
+		num_hits++;
+
+	KUNIT_EXPECT_EQ_MSG(test, num_hits, 1, "Should return plane src as damage.");
+	check_damage_clip(test, &clip, 4, 4, 1029, 773);
+}
+
+static void drm_test_damage_iter_no_damage_not_visible(struct kunit *test)
+{
+	struct drm_damage_mock *mock = test->priv;
+	struct drm_atomic_helper_damage_iter iter;
+	struct drm_rect clip;
+	u32 num_hits = 0;
+
+	mock->state.visible = false;
+
+	set_plane_src(&mock->old_state, 0, 0, 1024 << 16, 768 << 16);
+	set_plane_src(&mock->state, 0, 0, 1024 << 16, 768 << 16);
+	drm_atomic_helper_damage_iter_init(&iter, &mock->old_state, &mock->state);
+	drm_atomic_for_each_plane_damage(&iter, &clip)
+		num_hits++;
+
+	KUNIT_EXPECT_EQ_MSG(test, num_hits, 0, "Should have no damage.");
+}
+
+static void drm_test_damage_iter_no_damage_no_crtc(struct kunit *test)
+{
+	struct drm_damage_mock *mock = test->priv;
+	struct drm_atomic_helper_damage_iter iter;
+	struct drm_rect clip;
+	u32 num_hits = 0;
+
+	mock->state.crtc = NULL;
+
+	set_plane_src(&mock->old_state, 0, 0, 1024 << 16, 768 << 16);
+	set_plane_src(&mock->state, 0, 0, 1024 << 16, 768 << 16);
+	drm_atomic_helper_damage_iter_init(&iter, &mock->old_state, &mock->state);
+	drm_atomic_for_each_plane_damage(&iter, &clip)
+		num_hits++;
+
+	KUNIT_EXPECT_EQ_MSG(test, num_hits, 0, "Should have no damage.");
+}
+
+static void drm_test_damage_iter_no_damage_no_fb(struct kunit *test)
+{
+	struct drm_damage_mock *mock = test->priv;
+	struct drm_atomic_helper_damage_iter iter;
+	struct drm_rect clip;
+	u32 num_hits = 0;
+
+	mock->state.fb = NULL;
+
+	set_plane_src(&mock->old_state, 0, 0, 1024 << 16, 768 << 16);
+	set_plane_src(&mock->state, 0, 0, 1024 << 16, 768 << 16);
+	drm_atomic_helper_damage_iter_init(&iter, &mock->old_state, &mock->state);
+	drm_atomic_for_each_plane_damage(&iter, &clip)
+		num_hits++;
+
+	KUNIT_EXPECT_EQ_MSG(test, num_hits, 0, "Should have no damage.");
+}
+
+static void drm_test_damage_iter_simple_damage(struct kunit *test)
+{
+	struct drm_damage_mock *mock = test->priv;
+	struct drm_atomic_helper_damage_iter iter;
+	struct drm_property_blob damage_blob;
+	struct drm_mode_rect damage;
+	struct drm_rect clip;
+	u32 num_hits = 0;
+
+	set_plane_src(&mock->old_state, 0, 0, 1024 << 16, 768 << 16);
+	set_plane_src(&mock->state, 0, 0, 1024 << 16, 768 << 16);
+	/* Damage set to plane src */
+	set_damage_clip(&damage, 0, 0, 1024, 768);
+	set_damage_blob(&damage_blob, &damage, sizeof(damage));
+	set_plane_damage(&mock->state, &damage_blob);
+	drm_atomic_helper_damage_iter_init(&iter, &mock->old_state, &mock->state);
+	drm_atomic_for_each_plane_damage(&iter, &clip)
+		num_hits++;
+
+	KUNIT_EXPECT_EQ_MSG(test, num_hits, 1, "Should return damage when set.");
+	check_damage_clip(test, &clip, 0, 0, 1024, 768);
+}
+
+static void drm_test_damage_iter_single_damage(struct kunit *test)
+{
+	struct drm_damage_mock *mock = test->priv;
+	struct drm_atomic_helper_damage_iter iter;
+	struct drm_property_blob damage_blob;
+	struct drm_mode_rect damage;
+	struct drm_rect clip;
+	u32 num_hits = 0;
+
+	set_plane_src(&mock->old_state, 0, 0, 1024 << 16, 768 << 16);
+	set_plane_src(&mock->state, 0, 0, 1024 << 16, 768 << 16);
+	set_damage_clip(&damage, 256, 192, 768, 576);
+	set_damage_blob(&damage_blob, &damage, sizeof(damage));
+	set_plane_damage(&mock->state, &damage_blob);
+	drm_atomic_helper_damage_iter_init(&iter, &mock->old_state, &mock->state);
+	drm_atomic_for_each_plane_damage(&iter, &clip)
+		num_hits++;
+
+	KUNIT_EXPECT_EQ_MSG(test, num_hits, 1, "Should return damage when set.");
+	check_damage_clip(test, &clip, 256, 192, 768, 576);
+}
+
+static void drm_test_damage_iter_single_damage_intersect_src(struct kunit *test)
+{
+	struct drm_damage_mock *mock = test->priv;
+	struct drm_atomic_helper_damage_iter iter;
+	struct drm_property_blob damage_blob;
+	struct drm_mode_rect damage;
+	struct drm_rect clip;
+	u32 num_hits = 0;
+
+	set_plane_src(&mock->old_state, 0, 0, 1024 << 16, 768 << 16);
+	set_plane_src(&mock->state, 0, 0, 1024 << 16, 768 << 16);
+	/* Damage intersect with plane src. */
+	set_damage_clip(&damage, 256, 192, 1360, 768);
+	set_damage_blob(&damage_blob, &damage, sizeof(damage));
+	set_plane_damage(&mock->state, &damage_blob);
+	drm_atomic_helper_damage_iter_init(&iter, &mock->old_state, &mock->state);
+	drm_atomic_for_each_plane_damage(&iter, &clip)
+		num_hits++;
+
+	KUNIT_EXPECT_EQ_MSG(test, num_hits, 1, "Should return damage clipped to src.");
+	check_damage_clip(test, &clip, 256, 192, 1024, 768);
+}
+
+static void drm_test_damage_iter_single_damage_outside_src(struct kunit *test)
+{
+	struct drm_damage_mock *mock = test->priv;
+	struct drm_atomic_helper_damage_iter iter;
+	struct drm_property_blob damage_blob;
+	struct drm_mode_rect damage;
+	struct drm_rect clip;
+	u32 num_hits = 0;
+
+	set_plane_src(&mock->old_state, 0, 0, 1024 << 16, 768 << 16);
+	set_plane_src(&mock->state, 0, 0, 1024 << 16, 768 << 16);
+	/* Damage clip outside plane src */
+	set_damage_clip(&damage, 1360, 1360, 1380, 1380);
+	set_damage_blob(&damage_blob, &damage, sizeof(damage));
+	set_plane_damage(&mock->state, &damage_blob);
+	drm_atomic_helper_damage_iter_init(&iter, &mock->old_state, &mock->state);
+	drm_atomic_for_each_plane_damage(&iter, &clip)
+		num_hits++;
+
+	KUNIT_EXPECT_EQ_MSG(test, num_hits, 0, "Should have no damage.");
+}
+
+static void drm_test_damage_iter_single_damage_fractional_src(struct kunit *test)
+{
+	struct drm_damage_mock *mock = test->priv;
+	struct drm_atomic_helper_damage_iter iter;
+	struct drm_property_blob damage_blob;
+	struct drm_mode_rect damage;
+	struct drm_rect clip;
+	u32 num_hits = 0;
+
+	/* Plane src has fractional part. */
+	set_plane_src(&mock->old_state, 0x40002, 0x40002,
+		      0x40002 + (1024 << 16), 0x40002 + (768 << 16));
+	set_plane_src(&mock->state, 0x40002, 0x40002,
+		      0x40002 + (1024 << 16), 0x40002 + (768 << 16));
+	set_damage_clip(&damage, 10, 10, 256, 330);
+	set_damage_blob(&damage_blob, &damage, sizeof(damage));
+	set_plane_damage(&mock->state, &damage_blob);
+	drm_atomic_helper_damage_iter_init(&iter, &mock->old_state, &mock->state);
+	drm_atomic_for_each_plane_damage(&iter, &clip)
+		num_hits++;
+
+	KUNIT_EXPECT_EQ_MSG(test, num_hits, 1, "Should return damage when set.");
+	check_damage_clip(test, &clip, 10, 10, 256, 330);
+}
+
+static void drm_test_damage_iter_single_damage_intersect_fractional_src(struct kunit *test)
+{
+	struct drm_damage_mock *mock = test->priv;
+	struct drm_atomic_helper_damage_iter iter;
+	struct drm_property_blob damage_blob;
+	struct drm_mode_rect damage;
+	struct drm_rect clip;
+	u32 num_hits = 0;
+
+	/* Plane src has fractional part. */
+	set_plane_src(&mock->old_state, 0x40002, 0x40002,
+		      0x40002 + (1024 << 16), 0x40002 + (768 << 16));
+	set_plane_src(&mock->state, 0x40002, 0x40002,
+		      0x40002 + (1024 << 16), 0x40002 + (768 << 16));
+	/* Damage intersect with plane src. */
+	set_damage_clip(&damage, 10, 1, 1360, 330);
+	set_damage_blob(&damage_blob, &damage, sizeof(damage));
+	set_plane_damage(&mock->state, &damage_blob);
+	drm_atomic_helper_damage_iter_init(&iter, &mock->old_state, &mock->state);
+	drm_atomic_for_each_plane_damage(&iter, &clip)
+		num_hits++;
+
+	KUNIT_EXPECT_EQ_MSG(test, num_hits, 1,
+			    "Should return damage clipped to rounded off src.");
+	check_damage_clip(test, &clip, 10, 4, 1029, 330);
+}
+
+static void drm_test_damage_iter_single_damage_outside_fractional_src(struct kunit *test)
+{
+	struct drm_damage_mock *mock = test->priv;
+	struct drm_atomic_helper_damage_iter iter;
+	struct drm_property_blob damage_blob;
+	struct drm_mode_rect damage;
+	struct drm_rect clip;
+	u32 num_hits = 0;
+
+	/* Plane src has fractional part. */
+	set_plane_src(&mock->old_state, 0x40002, 0x40002,
+		      0x40002 + (1024 << 16), 0x40002 + (768 << 16));
+	set_plane_src(&mock->state, 0x40002, 0x40002,
+		      0x40002 + (1024 << 16), 0x40002 + (768 << 16));
+	/* Damage clip outside plane src */
+	set_damage_clip(&damage, 1360, 1360, 1380, 1380);
+	set_damage_blob(&damage_blob, &damage, sizeof(damage));
+	set_plane_damage(&mock->state, &damage_blob);
+	drm_atomic_helper_damage_iter_init(&iter, &mock->old_state, &mock->state);
+	drm_atomic_for_each_plane_damage(&iter, &clip)
+		num_hits++;
+
+	KUNIT_EXPECT_EQ_MSG(test, num_hits, 0, "Should have no damage.");
+}
+
+static void drm_test_damage_iter_single_damage_src_moved(struct kunit *test)
+{
+	struct drm_damage_mock *mock = test->priv;
+	struct drm_atomic_helper_damage_iter iter;
+	struct drm_property_blob damage_blob;
+	struct drm_mode_rect damage;
+	struct drm_rect clip;
+	u32 num_hits = 0;
+
+	/* Plane src moved since old plane state. */
+	set_plane_src(&mock->old_state, 0, 0, 1024 << 16, 768 << 16);
+	set_plane_src(&mock->state, 10 << 16, 10 << 16,
+		      (10 + 1024) << 16, (10 + 768) << 16);
+	set_damage_clip(&damage, 20, 30, 256, 256);
+	set_damage_blob(&damage_blob, &damage, sizeof(damage));
+	set_plane_damage(&mock->state, &damage_blob);
+	drm_atomic_helper_damage_iter_init(&iter, &mock->old_state, &mock->state);
+	drm_atomic_for_each_plane_damage(&iter, &clip)
+		num_hits++;
+
+	KUNIT_EXPECT_EQ_MSG(test, num_hits, 1,
+			    "Should return plane src as damage.");
+	check_damage_clip(test, &clip, 10, 10, 1034, 778);
+}
+
+static void drm_test_damage_iter_single_damage_fractional_src_moved(struct kunit *test)
+{
+	struct drm_damage_mock *mock = test->priv;
+	struct drm_atomic_helper_damage_iter iter;
+	struct drm_property_blob damage_blob;
+	struct drm_mode_rect damage;
+	struct drm_rect clip;
+	u32 num_hits = 0;
+
+	/* Plane src with fractional part moved since old plane state. */
+	set_plane_src(&mock->old_state, 0x3fffe, 0x3fffe,
+		      0x3fffe + (1024 << 16), 0x3fffe + (768 << 16));
+	set_plane_src(&mock->state, 0x40002, 0x40002,
+		      0x40002 + (1024 << 16), 0x40002 + (768 << 16));
+	/* Damage intersect with plane src. */
+	set_damage_clip(&damage, 20, 30, 1360, 256);
+	set_damage_blob(&damage_blob, &damage, sizeof(damage));
+	set_plane_damage(&mock->state, &damage_blob);
+	drm_atomic_helper_damage_iter_init(&iter, &mock->old_state, &mock->state);
+	drm_atomic_for_each_plane_damage(&iter, &clip)
+		num_hits++;
+
+	KUNIT_EXPECT_EQ_MSG(test, num_hits, 1,
+			    "Should return rounded off plane as damage.");
+	check_damage_clip(test, &clip, 4, 4, 1029, 773);
+}
+
+static void drm_test_damage_iter_damage(struct kunit *test)
+{
+	struct drm_damage_mock *mock = test->priv;
+	struct drm_atomic_helper_damage_iter iter;
+	struct drm_property_blob damage_blob;
+	struct drm_mode_rect damage[2];
+	struct drm_rect clip;
+	u32 num_hits = 0;
+
+	set_plane_src(&mock->old_state, 0, 0, 1024 << 16, 768 << 16);
+	set_plane_src(&mock->state, 0, 0, 1024 << 16, 768 << 16);
+	/* 2 damage clips. */
+	set_damage_clip(&damage[0], 20, 30, 200, 180);
+	set_damage_clip(&damage[1], 240, 200, 280, 250);
+	set_damage_blob(&damage_blob, &damage[0], sizeof(damage));
+	set_plane_damage(&mock->state, &damage_blob);
+	drm_atomic_helper_damage_iter_init(&iter, &mock->old_state, &mock->state);
+	drm_atomic_for_each_plane_damage(&iter, &clip) {
+		if (num_hits == 0)
+			check_damage_clip(test, &clip, 20, 30, 200, 180);
+		if (num_hits == 1)
+			check_damage_clip(test, &clip, 240, 200, 280, 250);
+		num_hits++;
+	}
+
+	KUNIT_EXPECT_EQ_MSG(test, num_hits, 2, "Should return damage when set.");
+}
+
+static void drm_test_damage_iter_damage_one_intersect(struct kunit *test)
+{
+	struct drm_damage_mock *mock = test->priv;
+	struct drm_atomic_helper_damage_iter iter;
+	struct drm_property_blob damage_blob;
+	struct drm_mode_rect damage[2];
+	struct drm_rect clip;
+	u32 num_hits = 0;
+
+	set_plane_src(&mock->old_state, 0x40002, 0x40002,
+		      0x40002 + (1024 << 16), 0x40002 + (768 << 16));
+	set_plane_src(&mock->state, 0x40002, 0x40002,
+		      0x40002 + (1024 << 16), 0x40002 + (768 << 16));
+	/* 2 damage clips, one intersect plane src. */
+	set_damage_clip(&damage[0], 20, 30, 200, 180);
+	set_damage_clip(&damage[1], 2, 2, 1360, 1360);
+	set_damage_blob(&damage_blob, &damage[0], sizeof(damage));
+	set_plane_damage(&mock->state, &damage_blob);
+	drm_atomic_helper_damage_iter_init(&iter, &mock->old_state, &mock->state);
+	drm_atomic_for_each_plane_damage(&iter, &clip) {
+		if (num_hits == 0)
+			check_damage_clip(test, &clip, 20, 30, 200, 180);
+		if (num_hits == 1)
+			check_damage_clip(test, &clip, 4, 4, 1029, 773);
+		num_hits++;
+	}
+
+	KUNIT_EXPECT_EQ_MSG(test, num_hits, 2, "Should return damage when set.");
+}
+
+static void drm_test_damage_iter_damage_one_outside(struct kunit *test)
+{
+	struct drm_damage_mock *mock = test->priv;
+	struct drm_atomic_helper_damage_iter iter;
+	struct drm_property_blob damage_blob;
+	struct drm_mode_rect damage[2];
+	struct drm_rect clip;
+	u32 num_hits = 0;
+
+	set_plane_src(&mock->old_state, 0, 0, 1024 << 16, 768 << 16);
+	set_plane_src(&mock->state, 0, 0, 1024 << 16, 768 << 16);
+	/* 2 damage clips, one outside plane src. */
+	set_damage_clip(&damage[0], 1360, 1360, 1380, 1380);
+	set_damage_clip(&damage[1], 240, 200, 280, 250);
+	set_damage_blob(&damage_blob, &damage[0], sizeof(damage));
+	set_plane_damage(&mock->state, &damage_blob);
+	drm_atomic_helper_damage_iter_init(&iter, &mock->old_state, &mock->state);
+	drm_atomic_for_each_plane_damage(&iter, &clip)
+		num_hits++;
+
+	KUNIT_EXPECT_EQ_MSG(test, num_hits, 1, "Should return damage when set.");
+	check_damage_clip(test, &clip, 240, 200, 280, 250);
+}
+
+static void drm_test_damage_iter_damage_src_moved(struct kunit *test)
+{
+	struct drm_damage_mock *mock = test->priv;
+	struct drm_atomic_helper_damage_iter iter;
+	struct drm_property_blob damage_blob;
+	struct drm_mode_rect damage[2];
+	struct drm_rect clip;
+	u32 num_hits = 0;
+
+	set_plane_src(&mock->old_state, 0x40002, 0x40002,
+		      0x40002 + (1024 << 16), 0x40002 + (768 << 16));
+	set_plane_src(&mock->state, 0x3fffe, 0x3fffe,
+		      0x3fffe + (1024 << 16), 0x3fffe + (768 << 16));
+	/* 2 damage clips, one outside plane src. */
+	set_damage_clip(&damage[0], 1360, 1360, 1380, 1380);
+	set_damage_clip(&damage[1], 240, 200, 280, 250);
+	set_damage_blob(&damage_blob, &damage[0], sizeof(damage));
+	set_plane_damage(&mock->state, &damage_blob);
+	drm_atomic_helper_damage_iter_init(&iter, &mock->old_state, &mock->state);
+	drm_atomic_for_each_plane_damage(&iter, &clip)
+		num_hits++;
+
+	KUNIT_EXPECT_EQ_MSG(test, num_hits, 1,
+			    "Should return round off plane src as damage.");
+	check_damage_clip(test, &clip, 3, 3, 1028, 772);
+}
+
+static void drm_test_damage_iter_damage_not_visible(struct kunit *test)
+{
+	struct drm_damage_mock *mock = test->priv;
+	struct drm_atomic_helper_damage_iter iter;
+	struct drm_property_blob damage_blob;
+	struct drm_mode_rect damage[2];
+	struct drm_rect clip;
+	u32 num_hits = 0;
+
+	mock->state.visible = false;
+
+	set_plane_src(&mock->old_state, 0x40002, 0x40002,
+		      0x40002 + (1024 << 16), 0x40002 + (768 << 16));
+	set_plane_src(&mock->state, 0x3fffe, 0x3fffe,
+		      0x3fffe + (1024 << 16), 0x3fffe + (768 << 16));
+	/* 2 damage clips, one outside plane src. */
+	set_damage_clip(&damage[0], 1360, 1360, 1380, 1380);
+	set_damage_clip(&damage[1], 240, 200, 280, 250);
+	set_damage_blob(&damage_blob, &damage[0], sizeof(damage));
+	set_plane_damage(&mock->state, &damage_blob);
+	drm_atomic_helper_damage_iter_init(&iter, &mock->old_state, &mock->state);
+	drm_atomic_for_each_plane_damage(&iter, &clip)
+		num_hits++;
+
+	KUNIT_EXPECT_EQ_MSG(test, num_hits, 0, "Should not return any damage.");
+}
+
+static struct kunit_case drm_damage_helper_tests[] = {
+	KUNIT_CASE(drm_test_damage_iter_no_damage),
+	KUNIT_CASE(drm_test_damage_iter_no_damage_fractional_src),
+	KUNIT_CASE(drm_test_damage_iter_no_damage_src_moved),
+	KUNIT_CASE(drm_test_damage_iter_no_damage_fractional_src_moved),
+	KUNIT_CASE(drm_test_damage_iter_no_damage_not_visible),
+	KUNIT_CASE(drm_test_damage_iter_no_damage_no_crtc),
+	KUNIT_CASE(drm_test_damage_iter_no_damage_no_fb),
+	KUNIT_CASE(drm_test_damage_iter_simple_damage),
+	KUNIT_CASE(drm_test_damage_iter_single_damage),
+	KUNIT_CASE(drm_test_damage_iter_single_damage_intersect_src),
+	KUNIT_CASE(drm_test_damage_iter_single_damage_outside_src),
+	KUNIT_CASE(drm_test_damage_iter_single_damage_fractional_src),
+	KUNIT_CASE(drm_test_damage_iter_single_damage_intersect_fractional_src),
+	KUNIT_CASE(drm_test_damage_iter_single_damage_outside_fractional_src),
+	KUNIT_CASE(drm_test_damage_iter_single_damage_src_moved),
+	KUNIT_CASE(drm_test_damage_iter_single_damage_fractional_src_moved),
+	KUNIT_CASE(drm_test_damage_iter_damage),
+	KUNIT_CASE(drm_test_damage_iter_damage_one_intersect),
+	KUNIT_CASE(drm_test_damage_iter_damage_one_outside),
+	KUNIT_CASE(drm_test_damage_iter_damage_src_moved),
+	KUNIT_CASE(drm_test_damage_iter_damage_not_visible),
+	{ }
+};
+
+static struct kunit_suite drm_damage_helper_test_suite = {
+	.name = "drm_damage_helper",
+	.init = drm_damage_helper_init,
+	.test_cases = drm_damage_helper_tests,
+};
+
+kunit_test_suite(drm_damage_helper_test_suite);
+
+MODULE_LICENSE("GPL");