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, 451 insertions, 0 deletions

diff --git a/drivers/gpu/drm/ttm/ttm_tt.c b/drivers/gpu/drm/ttm/ttm_tt.c
new file mode 100644
index 000000000..d50560393
--- /dev/null
+++ b/drivers/gpu/drm/ttm/ttm_tt.c
@@ -0,0 +1,451 @@
+/* SPDX-License-Identifier: GPL-2.0 OR MIT */
+/**************************************************************************
+ *
+ * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+/*
+ * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
+ */
+
+#define pr_fmt(fmt) "[TTM] " fmt
+
+#include <linux/sched.h>
+#include <linux/shmem_fs.h>
+#include <linux/file.h>
+#include <linux/module.h>
+#include <drm/drm_cache.h>
+#include <drm/ttm/ttm_bo_driver.h>
+
+#include "ttm_module.h"
+
+static unsigned long ttm_pages_limit;
+
+MODULE_PARM_DESC(pages_limit, "Limit for the allocated pages");
+module_param_named(pages_limit, ttm_pages_limit, ulong, 0644);
+
+static unsigned long ttm_dma32_pages_limit;
+
+MODULE_PARM_DESC(dma32_pages_limit, "Limit for the allocated DMA32 pages");
+module_param_named(dma32_pages_limit, ttm_dma32_pages_limit, ulong, 0644);
+
+static atomic_long_t ttm_pages_allocated;
+static atomic_long_t ttm_dma32_pages_allocated;
+
+/*
+ * Allocates a ttm structure for the given BO.
+ */
+int ttm_tt_create(struct ttm_buffer_object *bo, bool zero_alloc)
+{
+	struct ttm_device *bdev = bo->bdev;
+	uint32_t page_flags = 0;
+
+	dma_resv_assert_held(bo->base.resv);
+
+	if (bo->ttm)
+		return 0;
+
+	switch (bo->type) {
+	case ttm_bo_type_device:
+		if (zero_alloc)
+			page_flags |= TTM_TT_FLAG_ZERO_ALLOC;
+		break;
+	case ttm_bo_type_kernel:
+		break;
+	case ttm_bo_type_sg:
+		page_flags |= TTM_TT_FLAG_EXTERNAL;
+		break;
+	default:
+		pr_err("Illegal buffer object type\n");
+		return -EINVAL;
+	}
+
+	bo->ttm = bdev->funcs->ttm_tt_create(bo, page_flags);
+	if (unlikely(bo->ttm == NULL))
+		return -ENOMEM;
+
+	WARN_ON(bo->ttm->page_flags & TTM_TT_FLAG_EXTERNAL_MAPPABLE &&
+		!(bo->ttm->page_flags & TTM_TT_FLAG_EXTERNAL));
+
+	return 0;
+}
+
+/*
+ * Allocates storage for pointers to the pages that back the ttm.
+ */
+static int ttm_tt_alloc_page_directory(struct ttm_tt *ttm)
+{
+	ttm->pages = kvcalloc(ttm->num_pages, sizeof(void*), GFP_KERNEL);
+	if (!ttm->pages)
+		return -ENOMEM;
+
+	return 0;
+}
+
+static int ttm_dma_tt_alloc_page_directory(struct ttm_tt *ttm)
+{
+	ttm->pages = kvcalloc(ttm->num_pages, sizeof(*ttm->pages) +
+			      sizeof(*ttm->dma_address), GFP_KERNEL);
+	if (!ttm->pages)
+		return -ENOMEM;
+
+	ttm->dma_address = (void *)(ttm->pages + ttm->num_pages);
+	return 0;
+}
+
+static int ttm_sg_tt_alloc_page_directory(struct ttm_tt *ttm)
+{
+	ttm->dma_address = kvcalloc(ttm->num_pages, sizeof(*ttm->dma_address),
+				    GFP_KERNEL);
+	if (!ttm->dma_address)
+		return -ENOMEM;
+
+	return 0;
+}
+
+void ttm_tt_destroy(struct ttm_device *bdev, struct ttm_tt *ttm)
+{
+	bdev->funcs->ttm_tt_destroy(bdev, ttm);
+}
+
+static void ttm_tt_init_fields(struct ttm_tt *ttm,
+			       struct ttm_buffer_object *bo,
+			       uint32_t page_flags,
+			       enum ttm_caching caching,
+			       unsigned long extra_pages)
+{
+	ttm->num_pages = (PAGE_ALIGN(bo->base.size) >> PAGE_SHIFT) + extra_pages;
+	ttm->caching = ttm_cached;
+	ttm->page_flags = page_flags;
+	ttm->dma_address = NULL;
+	ttm->swap_storage = NULL;
+	ttm->sg = bo->sg;
+	ttm->caching = caching;
+}
+
+int ttm_tt_init(struct ttm_tt *ttm, struct ttm_buffer_object *bo,
+		uint32_t page_flags, enum ttm_caching caching,
+		unsigned long extra_pages)
+{
+	ttm_tt_init_fields(ttm, bo, page_flags, caching, extra_pages);
+
+	if (ttm_tt_alloc_page_directory(ttm)) {
+		pr_err("Failed allocating page table\n");
+		return -ENOMEM;
+	}
+	return 0;
+}
+EXPORT_SYMBOL(ttm_tt_init);
+
+void ttm_tt_fini(struct ttm_tt *ttm)
+{
+	WARN_ON(ttm->page_flags & TTM_TT_FLAG_PRIV_POPULATED);
+
+	if (ttm->swap_storage)
+		fput(ttm->swap_storage);
+	ttm->swap_storage = NULL;
+
+	if (ttm->pages)
+		kvfree(ttm->pages);
+	else
+		kvfree(ttm->dma_address);
+	ttm->pages = NULL;
+	ttm->dma_address = NULL;
+}
+EXPORT_SYMBOL(ttm_tt_fini);
+
+int ttm_sg_tt_init(struct ttm_tt *ttm, struct ttm_buffer_object *bo,
+		   uint32_t page_flags, enum ttm_caching caching)
+{
+	int ret;
+
+	ttm_tt_init_fields(ttm, bo, page_flags, caching, 0);
+
+	if (page_flags & TTM_TT_FLAG_EXTERNAL)
+		ret = ttm_sg_tt_alloc_page_directory(ttm);
+	else
+		ret = ttm_dma_tt_alloc_page_directory(ttm);
+	if (ret) {
+		pr_err("Failed allocating page table\n");
+		return -ENOMEM;
+	}
+	return 0;
+}
+EXPORT_SYMBOL(ttm_sg_tt_init);
+
+int ttm_tt_swapin(struct ttm_tt *ttm)
+{
+	struct address_space *swap_space;
+	struct file *swap_storage;
+	struct page *from_page;
+	struct page *to_page;
+	gfp_t gfp_mask;
+	int i, ret;
+
+	swap_storage = ttm->swap_storage;
+	BUG_ON(swap_storage == NULL);
+
+	swap_space = swap_storage->f_mapping;
+	gfp_mask = mapping_gfp_mask(swap_space);
+
+	for (i = 0; i < ttm->num_pages; ++i) {
+		from_page = shmem_read_mapping_page_gfp(swap_space, i,
+							gfp_mask);
+		if (IS_ERR(from_page)) {
+			ret = PTR_ERR(from_page);
+			goto out_err;
+		}
+		to_page = ttm->pages[i];
+		if (unlikely(to_page == NULL)) {
+			ret = -ENOMEM;
+			goto out_err;
+		}
+
+		copy_highpage(to_page, from_page);
+		put_page(from_page);
+	}
+
+	fput(swap_storage);
+	ttm->swap_storage = NULL;
+	ttm->page_flags &= ~TTM_TT_FLAG_SWAPPED;
+
+	return 0;
+
+out_err:
+	return ret;
+}
+
+/**
+ * ttm_tt_swapout - swap out tt object
+ *
+ * @bdev: TTM device structure.
+ * @ttm: The struct ttm_tt.
+ * @gfp_flags: Flags to use for memory allocation.
+ *
+ * Swapout a TT object to a shmem_file, return number of pages swapped out or
+ * negative error code.
+ */
+int ttm_tt_swapout(struct ttm_device *bdev, struct ttm_tt *ttm,
+		   gfp_t gfp_flags)
+{
+	loff_t size = (loff_t)ttm->num_pages << PAGE_SHIFT;
+	struct address_space *swap_space;
+	struct file *swap_storage;
+	struct page *from_page;
+	struct page *to_page;
+	int i, ret;
+
+	swap_storage = shmem_file_setup("ttm swap", size, 0);
+	if (IS_ERR(swap_storage)) {
+		pr_err("Failed allocating swap storage\n");
+		return PTR_ERR(swap_storage);
+	}
+
+	swap_space = swap_storage->f_mapping;
+	gfp_flags &= mapping_gfp_mask(swap_space);
+
+	for (i = 0; i < ttm->num_pages; ++i) {
+		from_page = ttm->pages[i];
+		if (unlikely(from_page == NULL))
+			continue;
+
+		to_page = shmem_read_mapping_page_gfp(swap_space, i, gfp_flags);
+		if (IS_ERR(to_page)) {
+			ret = PTR_ERR(to_page);
+			goto out_err;
+		}
+		copy_highpage(to_page, from_page);
+		set_page_dirty(to_page);
+		mark_page_accessed(to_page);
+		put_page(to_page);
+	}
+
+	ttm_tt_unpopulate(bdev, ttm);
+	ttm->swap_storage = swap_storage;
+	ttm->page_flags |= TTM_TT_FLAG_SWAPPED;
+
+	return ttm->num_pages;
+
+out_err:
+	fput(swap_storage);
+
+	return ret;
+}
+
+int ttm_tt_populate(struct ttm_device *bdev,
+		    struct ttm_tt *ttm, struct ttm_operation_ctx *ctx)
+{
+	int ret;
+
+	if (!ttm)
+		return -EINVAL;
+
+	if (ttm_tt_is_populated(ttm))
+		return 0;
+
+	if (!(ttm->page_flags & TTM_TT_FLAG_EXTERNAL)) {
+		atomic_long_add(ttm->num_pages, &ttm_pages_allocated);
+		if (bdev->pool.use_dma32)
+			atomic_long_add(ttm->num_pages,
+					&ttm_dma32_pages_allocated);
+	}
+
+	while (atomic_long_read(&ttm_pages_allocated) > ttm_pages_limit ||
+	       atomic_long_read(&ttm_dma32_pages_allocated) >
+	       ttm_dma32_pages_limit) {
+
+		ret = ttm_global_swapout(ctx, GFP_KERNEL);
+		if (ret == 0)
+			break;
+		if (ret < 0)
+			goto error;
+	}
+
+	if (bdev->funcs->ttm_tt_populate)
+		ret = bdev->funcs->ttm_tt_populate(bdev, ttm, ctx);
+	else
+		ret = ttm_pool_alloc(&bdev->pool, ttm, ctx);
+	if (ret)
+		goto error;
+
+	ttm->page_flags |= TTM_TT_FLAG_PRIV_POPULATED;
+	if (unlikely(ttm->page_flags & TTM_TT_FLAG_SWAPPED)) {
+		ret = ttm_tt_swapin(ttm);
+		if (unlikely(ret != 0)) {
+			ttm_tt_unpopulate(bdev, ttm);
+			return ret;
+		}
+	}
+
+	return 0;
+
+error:
+	if (!(ttm->page_flags & TTM_TT_FLAG_EXTERNAL)) {
+		atomic_long_sub(ttm->num_pages, &ttm_pages_allocated);
+		if (bdev->pool.use_dma32)
+			atomic_long_sub(ttm->num_pages,
+					&ttm_dma32_pages_allocated);
+	}
+	return ret;
+}
+EXPORT_SYMBOL(ttm_tt_populate);
+
+void ttm_tt_unpopulate(struct ttm_device *bdev, struct ttm_tt *ttm)
+{
+	if (!ttm_tt_is_populated(ttm))
+		return;
+
+	if (bdev->funcs->ttm_tt_unpopulate)
+		bdev->funcs->ttm_tt_unpopulate(bdev, ttm);
+	else
+		ttm_pool_free(&bdev->pool, ttm);
+
+	if (!(ttm->page_flags & TTM_TT_FLAG_EXTERNAL)) {
+		atomic_long_sub(ttm->num_pages, &ttm_pages_allocated);
+		if (bdev->pool.use_dma32)
+			atomic_long_sub(ttm->num_pages,
+					&ttm_dma32_pages_allocated);
+	}
+
+	ttm->page_flags &= ~TTM_TT_FLAG_PRIV_POPULATED;
+}
+
+#ifdef CONFIG_DEBUG_FS
+
+/* Test the shrinker functions and dump the result */
+static int ttm_tt_debugfs_shrink_show(struct seq_file *m, void *data)
+{
+	struct ttm_operation_ctx ctx = { false, false };
+
+	seq_printf(m, "%d\n", ttm_global_swapout(&ctx, GFP_KERNEL));
+	return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(ttm_tt_debugfs_shrink);
+
+#endif
+
+
+/*
+ * ttm_tt_mgr_init - register with the MM shrinker
+ *
+ * Register with the MM shrinker for swapping out BOs.
+ */
+void ttm_tt_mgr_init(unsigned long num_pages, unsigned long num_dma32_pages)
+{
+#ifdef CONFIG_DEBUG_FS
+	debugfs_create_file("tt_shrink", 0400, ttm_debugfs_root, NULL,
+			    &ttm_tt_debugfs_shrink_fops);
+#endif
+
+	if (!ttm_pages_limit)
+		ttm_pages_limit = num_pages;
+
+	if (!ttm_dma32_pages_limit)
+		ttm_dma32_pages_limit = num_dma32_pages;
+}
+
+static void ttm_kmap_iter_tt_map_local(struct ttm_kmap_iter *iter,
+				       struct iosys_map *dmap,
+				       pgoff_t i)
+{
+	struct ttm_kmap_iter_tt *iter_tt =
+		container_of(iter, typeof(*iter_tt), base);
+
+	iosys_map_set_vaddr(dmap, kmap_local_page_prot(iter_tt->tt->pages[i],
+						       iter_tt->prot));
+}
+
+static void ttm_kmap_iter_tt_unmap_local(struct ttm_kmap_iter *iter,
+					 struct iosys_map *map)
+{
+	kunmap_local(map->vaddr);
+}
+
+static const struct ttm_kmap_iter_ops ttm_kmap_iter_tt_ops = {
+	.map_local = ttm_kmap_iter_tt_map_local,
+	.unmap_local = ttm_kmap_iter_tt_unmap_local,
+	.maps_tt = true,
+};
+
+/**
+ * ttm_kmap_iter_tt_init - Initialize a struct ttm_kmap_iter_tt
+ * @iter_tt: The struct ttm_kmap_iter_tt to initialize.
+ * @tt: Struct ttm_tt holding page pointers of the struct ttm_resource.
+ *
+ * Return: Pointer to the embedded struct ttm_kmap_iter.
+ */
+struct ttm_kmap_iter *
+ttm_kmap_iter_tt_init(struct ttm_kmap_iter_tt *iter_tt,
+		      struct ttm_tt *tt)
+{
+	iter_tt->base.ops = &ttm_kmap_iter_tt_ops;
+	iter_tt->tt = tt;
+	if (tt)
+		iter_tt->prot = ttm_prot_from_caching(tt->caching, PAGE_KERNEL);
+	else
+		iter_tt->prot = PAGE_KERNEL;
+
+	return &iter_tt->base;
+}
+EXPORT_SYMBOL(ttm_kmap_iter_tt_init);