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, 670 insertions, 0 deletions

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_cotable.c b/drivers/gpu/drm/vmwgfx/vmwgfx_cotable.c
new file mode 100644
index 000000000..b78a10312
--- /dev/null
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_cotable.c
@@ -0,0 +1,670 @@
+// SPDX-License-Identifier: GPL-2.0 OR MIT
+/**************************************************************************
+ *
+ * Copyright 2014-2015 VMware, Inc., Palo Alto, CA., USA
+ *
+ * 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.
+ *
+ **************************************************************************/
+/*
+ * Treat context OTables as resources to make use of the resource
+ * backing MOB eviction mechanism, that is used to read back the COTable
+ * whenever the backing MOB is evicted.
+ */
+
+#include <drm/ttm/ttm_placement.h>
+
+#include "vmwgfx_drv.h"
+#include "vmwgfx_mksstat.h"
+#include "vmwgfx_resource_priv.h"
+#include "vmwgfx_so.h"
+
+/**
+ * struct vmw_cotable - Context Object Table resource
+ *
+ * @res: struct vmw_resource we are deriving from.
+ * @ctx: non-refcounted pointer to the owning context.
+ * @size_read_back: Size of data read back during eviction.
+ * @seen_entries: Seen entries in command stream for this cotable.
+ * @type: The cotable type.
+ * @scrubbed: Whether the cotable has been scrubbed.
+ * @resource_list: List of resources in the cotable.
+ */
+struct vmw_cotable {
+	struct vmw_resource res;
+	struct vmw_resource *ctx;
+	size_t size_read_back;
+	int seen_entries;
+	u32 type;
+	bool scrubbed;
+	struct list_head resource_list;
+};
+
+/**
+ * struct vmw_cotable_info - Static info about cotable types
+ *
+ * @min_initial_entries: Min number of initial intries at cotable allocation
+ * for this cotable type.
+ * @size: Size of each entry.
+ * @unbind_func: Unbind call-back function.
+ */
+struct vmw_cotable_info {
+	u32 min_initial_entries;
+	u32 size;
+	void (*unbind_func)(struct vmw_private *, struct list_head *,
+			    bool);
+};
+
+
+/*
+ * Getting the initial size right is difficult because it all depends
+ * on what the userspace is doing. The sizes will be aligned up to
+ * a PAGE_SIZE so we just want to make sure that for majority of apps
+ * the initial number of entries doesn't require an immediate resize.
+ * For all cotables except SVGACOTableDXElementLayoutEntry and
+ * SVGACOTableDXBlendStateEntry the initial number of entries fits
+ * within the PAGE_SIZE. For SVGACOTableDXElementLayoutEntry and
+ * SVGACOTableDXBlendStateEntry we want to reserve two pages,
+ * because that's what all apps will require initially.
+ */
+static const struct vmw_cotable_info co_info[] = {
+	{1, sizeof(SVGACOTableDXRTViewEntry), &vmw_view_cotable_list_destroy},
+	{1, sizeof(SVGACOTableDXDSViewEntry), &vmw_view_cotable_list_destroy},
+	{1, sizeof(SVGACOTableDXSRViewEntry), &vmw_view_cotable_list_destroy},
+	{PAGE_SIZE/sizeof(SVGACOTableDXElementLayoutEntry) + 1, sizeof(SVGACOTableDXElementLayoutEntry), NULL},
+	{PAGE_SIZE/sizeof(SVGACOTableDXBlendStateEntry) + 1, sizeof(SVGACOTableDXBlendStateEntry), NULL},
+	{1, sizeof(SVGACOTableDXDepthStencilEntry), NULL},
+	{1, sizeof(SVGACOTableDXRasterizerStateEntry), NULL},
+	{1, sizeof(SVGACOTableDXSamplerEntry), NULL},
+	{1, sizeof(SVGACOTableDXStreamOutputEntry), &vmw_dx_streamoutput_cotable_list_scrub},
+	{1, sizeof(SVGACOTableDXQueryEntry), NULL},
+	{1, sizeof(SVGACOTableDXShaderEntry), &vmw_dx_shader_cotable_list_scrub},
+	{1, sizeof(SVGACOTableDXUAViewEntry), &vmw_view_cotable_list_destroy}
+};
+
+/*
+ * Cotables with bindings that we remove must be scrubbed first,
+ * otherwise, the device will swap in an invalid context when we remove
+ * bindings before scrubbing a cotable...
+ */
+const SVGACOTableType vmw_cotable_scrub_order[] = {
+	SVGA_COTABLE_RTVIEW,
+	SVGA_COTABLE_DSVIEW,
+	SVGA_COTABLE_SRVIEW,
+	SVGA_COTABLE_DXSHADER,
+	SVGA_COTABLE_ELEMENTLAYOUT,
+	SVGA_COTABLE_BLENDSTATE,
+	SVGA_COTABLE_DEPTHSTENCIL,
+	SVGA_COTABLE_RASTERIZERSTATE,
+	SVGA_COTABLE_SAMPLER,
+	SVGA_COTABLE_STREAMOUTPUT,
+	SVGA_COTABLE_DXQUERY,
+	SVGA_COTABLE_UAVIEW,
+};
+
+static int vmw_cotable_bind(struct vmw_resource *res,
+			    struct ttm_validate_buffer *val_buf);
+static int vmw_cotable_unbind(struct vmw_resource *res,
+			      bool readback,
+			      struct ttm_validate_buffer *val_buf);
+static int vmw_cotable_create(struct vmw_resource *res);
+static int vmw_cotable_destroy(struct vmw_resource *res);
+
+static const struct vmw_res_func vmw_cotable_func = {
+	.res_type = vmw_res_cotable,
+	.needs_backup = true,
+	.may_evict = true,
+	.prio = 3,
+	.dirty_prio = 3,
+	.type_name = "context guest backed object tables",
+	.backup_placement = &vmw_mob_placement,
+	.create = vmw_cotable_create,
+	.destroy = vmw_cotable_destroy,
+	.bind = vmw_cotable_bind,
+	.unbind = vmw_cotable_unbind,
+};
+
+/**
+ * vmw_cotable - Convert a struct vmw_resource pointer to a struct
+ * vmw_cotable pointer
+ *
+ * @res: Pointer to the resource.
+ */
+static struct vmw_cotable *vmw_cotable(struct vmw_resource *res)
+{
+	return container_of(res, struct vmw_cotable, res);
+}
+
+/**
+ * vmw_cotable_destroy - Cotable resource destroy callback
+ *
+ * @res: Pointer to the cotable resource.
+ *
+ * There is no device cotable destroy command, so this function only
+ * makes sure that the resource id is set to invalid.
+ */
+static int vmw_cotable_destroy(struct vmw_resource *res)
+{
+	res->id = -1;
+	return 0;
+}
+
+/**
+ * vmw_cotable_unscrub - Undo a cotable unscrub operation
+ *
+ * @res: Pointer to the cotable resource
+ *
+ * This function issues commands to (re)bind the cotable to
+ * its backing mob, which needs to be validated and reserved at this point.
+ * This is identical to bind() except the function interface looks different.
+ */
+static int vmw_cotable_unscrub(struct vmw_resource *res)
+{
+	struct vmw_cotable *vcotbl = vmw_cotable(res);
+	struct vmw_private *dev_priv = res->dev_priv;
+	struct ttm_buffer_object *bo = &res->backup->base;
+	struct {
+		SVGA3dCmdHeader header;
+		SVGA3dCmdDXSetCOTable body;
+	} *cmd;
+
+	WARN_ON_ONCE(bo->resource->mem_type != VMW_PL_MOB);
+	dma_resv_assert_held(bo->base.resv);
+
+	cmd = VMW_CMD_RESERVE(dev_priv, sizeof(*cmd));
+	if (!cmd)
+		return -ENOMEM;
+
+	WARN_ON(vcotbl->ctx->id == SVGA3D_INVALID_ID);
+	WARN_ON(bo->resource->mem_type != VMW_PL_MOB);
+	cmd->header.id = SVGA_3D_CMD_DX_SET_COTABLE;
+	cmd->header.size = sizeof(cmd->body);
+	cmd->body.cid = vcotbl->ctx->id;
+	cmd->body.type = vcotbl->type;
+	cmd->body.mobid = bo->resource->start;
+	cmd->body.validSizeInBytes = vcotbl->size_read_back;
+
+	vmw_cmd_commit_flush(dev_priv, sizeof(*cmd));
+	vcotbl->scrubbed = false;
+
+	return 0;
+}
+
+/**
+ * vmw_cotable_bind - Undo a cotable unscrub operation
+ *
+ * @res: Pointer to the cotable resource
+ * @val_buf: Pointer to a struct ttm_validate_buffer prepared by the caller
+ * for convenience / fencing.
+ *
+ * This function issues commands to (re)bind the cotable to
+ * its backing mob, which needs to be validated and reserved at this point.
+ */
+static int vmw_cotable_bind(struct vmw_resource *res,
+			    struct ttm_validate_buffer *val_buf)
+{
+	/*
+	 * The create() callback may have changed @res->backup without
+	 * the caller noticing, and with val_buf->bo still pointing to
+	 * the old backup buffer. Although hackish, and not used currently,
+	 * take the opportunity to correct the value here so that it's not
+	 * misused in the future.
+	 */
+	val_buf->bo = &res->backup->base;
+
+	return vmw_cotable_unscrub(res);
+}
+
+/**
+ * vmw_cotable_scrub - Scrub the cotable from the device.
+ *
+ * @res: Pointer to the cotable resource.
+ * @readback: Whether initiate a readback of the cotable data to the backup
+ * buffer.
+ *
+ * In some situations (context swapouts) it might be desirable to make the
+ * device forget about the cotable without performing a full unbind. A full
+ * unbind requires reserved backup buffers and it might not be possible to
+ * reserve them due to locking order violation issues. The vmw_cotable_scrub
+ * function implements a partial unbind() without that requirement but with the
+ * following restrictions.
+ * 1) Before the cotable is again used by the GPU, vmw_cotable_unscrub() must
+ *    be called.
+ * 2) Before the cotable backing buffer is used by the CPU, or during the
+ *    resource destruction, vmw_cotable_unbind() must be called.
+ */
+int vmw_cotable_scrub(struct vmw_resource *res, bool readback)
+{
+	struct vmw_cotable *vcotbl = vmw_cotable(res);
+	struct vmw_private *dev_priv = res->dev_priv;
+	size_t submit_size;
+
+	struct {
+		SVGA3dCmdHeader header;
+		SVGA3dCmdDXReadbackCOTable body;
+	} *cmd0;
+	struct {
+		SVGA3dCmdHeader header;
+		SVGA3dCmdDXSetCOTable body;
+	} *cmd1;
+
+	if (vcotbl->scrubbed)
+		return 0;
+
+	if (co_info[vcotbl->type].unbind_func)
+		co_info[vcotbl->type].unbind_func(dev_priv,
+						  &vcotbl->resource_list,
+						  readback);
+	submit_size = sizeof(*cmd1);
+	if (readback)
+		submit_size += sizeof(*cmd0);
+
+	cmd1 = VMW_CMD_RESERVE(dev_priv, submit_size);
+	if (!cmd1)
+		return -ENOMEM;
+
+	vcotbl->size_read_back = 0;
+	if (readback) {
+		cmd0 = (void *) cmd1;
+		cmd0->header.id = SVGA_3D_CMD_DX_READBACK_COTABLE;
+		cmd0->header.size = sizeof(cmd0->body);
+		cmd0->body.cid = vcotbl->ctx->id;
+		cmd0->body.type = vcotbl->type;
+		cmd1 = (void *) &cmd0[1];
+		vcotbl->size_read_back = res->backup_size;
+	}
+	cmd1->header.id = SVGA_3D_CMD_DX_SET_COTABLE;
+	cmd1->header.size = sizeof(cmd1->body);
+	cmd1->body.cid = vcotbl->ctx->id;
+	cmd1->body.type = vcotbl->type;
+	cmd1->body.mobid = SVGA3D_INVALID_ID;
+	cmd1->body.validSizeInBytes = 0;
+	vmw_cmd_commit_flush(dev_priv, submit_size);
+	vcotbl->scrubbed = true;
+
+	/* Trigger a create() on next validate. */
+	res->id = -1;
+
+	return 0;
+}
+
+/**
+ * vmw_cotable_unbind - Cotable resource unbind callback
+ *
+ * @res: Pointer to the cotable resource.
+ * @readback: Whether to read back cotable data to the backup buffer.
+ * @val_buf: Pointer to a struct ttm_validate_buffer prepared by the caller
+ * for convenience / fencing.
+ *
+ * Unbinds the cotable from the device and fences the backup buffer.
+ */
+static int vmw_cotable_unbind(struct vmw_resource *res,
+			      bool readback,
+			      struct ttm_validate_buffer *val_buf)
+{
+	struct vmw_cotable *vcotbl = vmw_cotable(res);
+	struct vmw_private *dev_priv = res->dev_priv;
+	struct ttm_buffer_object *bo = val_buf->bo;
+	struct vmw_fence_obj *fence;
+
+	if (!vmw_resource_mob_attached(res))
+		return 0;
+
+	WARN_ON_ONCE(bo->resource->mem_type != VMW_PL_MOB);
+	dma_resv_assert_held(bo->base.resv);
+
+	mutex_lock(&dev_priv->binding_mutex);
+	if (!vcotbl->scrubbed)
+		vmw_dx_context_scrub_cotables(vcotbl->ctx, readback);
+	mutex_unlock(&dev_priv->binding_mutex);
+	(void) vmw_execbuf_fence_commands(NULL, dev_priv, &fence, NULL);
+	vmw_bo_fence_single(bo, fence);
+	if (likely(fence != NULL))
+		vmw_fence_obj_unreference(&fence);
+
+	return 0;
+}
+
+/**
+ * vmw_cotable_readback - Read back a cotable without unbinding.
+ *
+ * @res: The cotable resource.
+ *
+ * Reads back a cotable to its backing mob without scrubbing the MOB from
+ * the cotable. The MOB is fenced for subsequent CPU access.
+ */
+static int vmw_cotable_readback(struct vmw_resource *res)
+{
+	struct vmw_cotable *vcotbl = vmw_cotable(res);
+	struct vmw_private *dev_priv = res->dev_priv;
+
+	struct {
+		SVGA3dCmdHeader header;
+		SVGA3dCmdDXReadbackCOTable body;
+	} *cmd;
+	struct vmw_fence_obj *fence;
+
+	if (!vcotbl->scrubbed) {
+		cmd = VMW_CMD_RESERVE(dev_priv, sizeof(*cmd));
+		if (!cmd)
+			return -ENOMEM;
+
+		cmd->header.id = SVGA_3D_CMD_DX_READBACK_COTABLE;
+		cmd->header.size = sizeof(cmd->body);
+		cmd->body.cid = vcotbl->ctx->id;
+		cmd->body.type = vcotbl->type;
+		vcotbl->size_read_back = res->backup_size;
+		vmw_cmd_commit(dev_priv, sizeof(*cmd));
+	}
+
+	(void) vmw_execbuf_fence_commands(NULL, dev_priv, &fence, NULL);
+	vmw_bo_fence_single(&res->backup->base, fence);
+	vmw_fence_obj_unreference(&fence);
+
+	return 0;
+}
+
+/**
+ * vmw_cotable_resize - Resize a cotable.
+ *
+ * @res: The cotable resource.
+ * @new_size: The new size.
+ *
+ * Resizes a cotable and binds the new backup buffer.
+ * On failure the cotable is left intact.
+ * Important! This function may not fail once the MOB switch has been
+ * committed to hardware. That would put the device context in an
+ * invalid state which we can't currently recover from.
+ */
+static int vmw_cotable_resize(struct vmw_resource *res, size_t new_size)
+{
+	struct ttm_operation_ctx ctx = { false, false };
+	struct vmw_private *dev_priv = res->dev_priv;
+	struct vmw_cotable *vcotbl = vmw_cotable(res);
+	struct vmw_buffer_object *buf, *old_buf = res->backup;
+	struct ttm_buffer_object *bo, *old_bo = &res->backup->base;
+	size_t old_size = res->backup_size;
+	size_t old_size_read_back = vcotbl->size_read_back;
+	size_t cur_size_read_back;
+	struct ttm_bo_kmap_obj old_map, new_map;
+	int ret;
+	size_t i;
+
+	MKS_STAT_TIME_DECL(MKSSTAT_KERN_COTABLE_RESIZE);
+	MKS_STAT_TIME_PUSH(MKSSTAT_KERN_COTABLE_RESIZE);
+
+	ret = vmw_cotable_readback(res);
+	if (ret)
+		goto out_done;
+
+	cur_size_read_back = vcotbl->size_read_back;
+	vcotbl->size_read_back = old_size_read_back;
+
+	/*
+	 * While device is processing, Allocate and reserve a buffer object
+	 * for the new COTable. Initially pin the buffer object to make sure
+	 * we can use tryreserve without failure.
+	 */
+	ret = vmw_bo_create(dev_priv, new_size, &vmw_mob_placement,
+			    true, true, vmw_bo_bo_free, &buf);
+	if (ret) {
+		DRM_ERROR("Failed initializing new cotable MOB.\n");
+		goto out_done;
+	}
+
+	bo = &buf->base;
+	WARN_ON_ONCE(ttm_bo_reserve(bo, false, true, NULL));
+
+	ret = ttm_bo_wait(old_bo, false, false);
+	if (unlikely(ret != 0)) {
+		DRM_ERROR("Failed waiting for cotable unbind.\n");
+		goto out_wait;
+	}
+
+	/*
+	 * Do a page by page copy of COTables. This eliminates slow vmap()s.
+	 * This should really be a TTM utility.
+	 */
+	for (i = 0; i < PFN_UP(old_bo->resource->size); ++i) {
+		bool dummy;
+
+		ret = ttm_bo_kmap(old_bo, i, 1, &old_map);
+		if (unlikely(ret != 0)) {
+			DRM_ERROR("Failed mapping old COTable on resize.\n");
+			goto out_wait;
+		}
+		ret = ttm_bo_kmap(bo, i, 1, &new_map);
+		if (unlikely(ret != 0)) {
+			DRM_ERROR("Failed mapping new COTable on resize.\n");
+			goto out_map_new;
+		}
+		memcpy(ttm_kmap_obj_virtual(&new_map, &dummy),
+		       ttm_kmap_obj_virtual(&old_map, &dummy),
+		       PAGE_SIZE);
+		ttm_bo_kunmap(&new_map);
+		ttm_bo_kunmap(&old_map);
+	}
+
+	/* Unpin new buffer, and switch backup buffers. */
+	ret = ttm_bo_validate(bo, &vmw_mob_placement, &ctx);
+	if (unlikely(ret != 0)) {
+		DRM_ERROR("Failed validating new COTable backup buffer.\n");
+		goto out_wait;
+	}
+
+	vmw_resource_mob_detach(res);
+	res->backup = buf;
+	res->backup_size = new_size;
+	vcotbl->size_read_back = cur_size_read_back;
+
+	/*
+	 * Now tell the device to switch. If this fails, then we need to
+	 * revert the full resize.
+	 */
+	ret = vmw_cotable_unscrub(res);
+	if (ret) {
+		DRM_ERROR("Failed switching COTable backup buffer.\n");
+		res->backup = old_buf;
+		res->backup_size = old_size;
+		vcotbl->size_read_back = old_size_read_back;
+		vmw_resource_mob_attach(res);
+		goto out_wait;
+	}
+
+	vmw_resource_mob_attach(res);
+	/* Let go of the old mob. */
+	vmw_bo_unreference(&old_buf);
+	res->id = vcotbl->type;
+
+	ret = dma_resv_reserve_fences(bo->base.resv, 1);
+	if (unlikely(ret))
+		goto out_wait;
+
+	/* Release the pin acquired in vmw_bo_init */
+	ttm_bo_unpin(bo);
+
+	MKS_STAT_TIME_POP(MKSSTAT_KERN_COTABLE_RESIZE);
+
+	return 0;
+
+out_map_new:
+	ttm_bo_kunmap(&old_map);
+out_wait:
+	ttm_bo_unpin(bo);
+	ttm_bo_unreserve(bo);
+	vmw_bo_unreference(&buf);
+
+out_done:
+	MKS_STAT_TIME_POP(MKSSTAT_KERN_COTABLE_RESIZE);
+
+	return ret;
+}
+
+/**
+ * vmw_cotable_create - Cotable resource create callback
+ *
+ * @res: Pointer to a cotable resource.
+ *
+ * There is no separate create command for cotables, so this callback, which
+ * is called before bind() in the validation sequence is instead used for two
+ * things.
+ * 1) Unscrub the cotable if it is scrubbed and still attached to a backup
+ *    buffer.
+ * 2) Resize the cotable if needed.
+ */
+static int vmw_cotable_create(struct vmw_resource *res)
+{
+	struct vmw_cotable *vcotbl = vmw_cotable(res);
+	size_t new_size = res->backup_size;
+	size_t needed_size;
+	int ret;
+
+	/* Check whether we need to resize the cotable */
+	needed_size = (vcotbl->seen_entries + 1) * co_info[vcotbl->type].size;
+	while (needed_size > new_size)
+		new_size *= 2;
+
+	if (likely(new_size <= res->backup_size)) {
+		if (vcotbl->scrubbed && vmw_resource_mob_attached(res)) {
+			ret = vmw_cotable_unscrub(res);
+			if (ret)
+				return ret;
+		}
+		res->id = vcotbl->type;
+		return 0;
+	}
+
+	return vmw_cotable_resize(res, new_size);
+}
+
+/**
+ * vmw_hw_cotable_destroy - Cotable hw_destroy callback
+ *
+ * @res: Pointer to a cotable resource.
+ *
+ * The final (part of resource destruction) destroy callback.
+ */
+static void vmw_hw_cotable_destroy(struct vmw_resource *res)
+{
+	(void) vmw_cotable_destroy(res);
+}
+
+/**
+ * vmw_cotable_free - Cotable resource destructor
+ *
+ * @res: Pointer to a cotable resource.
+ */
+static void vmw_cotable_free(struct vmw_resource *res)
+{
+	kfree(res);
+}
+
+/**
+ * vmw_cotable_alloc - Create a cotable resource
+ *
+ * @dev_priv: Pointer to a device private struct.
+ * @ctx: Pointer to the context resource.
+ * The cotable resource will not add a refcount.
+ * @type: The cotable type.
+ */
+struct vmw_resource *vmw_cotable_alloc(struct vmw_private *dev_priv,
+				       struct vmw_resource *ctx,
+				       u32 type)
+{
+	struct vmw_cotable *vcotbl;
+	int ret;
+	u32 num_entries;
+
+	vcotbl = kzalloc(sizeof(*vcotbl), GFP_KERNEL);
+	if (unlikely(!vcotbl)) {
+		ret = -ENOMEM;
+		goto out_no_alloc;
+	}
+
+	ret = vmw_resource_init(dev_priv, &vcotbl->res, true,
+				vmw_cotable_free, &vmw_cotable_func);
+	if (unlikely(ret != 0))
+		goto out_no_init;
+
+	INIT_LIST_HEAD(&vcotbl->resource_list);
+	vcotbl->res.id = type;
+	vcotbl->res.backup_size = PAGE_SIZE;
+	num_entries = PAGE_SIZE / co_info[type].size;
+	if (num_entries < co_info[type].min_initial_entries) {
+		vcotbl->res.backup_size = co_info[type].min_initial_entries *
+			co_info[type].size;
+		vcotbl->res.backup_size = PFN_ALIGN(vcotbl->res.backup_size);
+	}
+
+	vcotbl->scrubbed = true;
+	vcotbl->seen_entries = -1;
+	vcotbl->type = type;
+	vcotbl->ctx = ctx;
+
+	vcotbl->res.hw_destroy = vmw_hw_cotable_destroy;
+
+	return &vcotbl->res;
+
+out_no_init:
+	kfree(vcotbl);
+out_no_alloc:
+	return ERR_PTR(ret);
+}
+
+/**
+ * vmw_cotable_notify - Notify the cotable about an item creation
+ *
+ * @res: Pointer to a cotable resource.
+ * @id: Item id.
+ */
+int vmw_cotable_notify(struct vmw_resource *res, int id)
+{
+	struct vmw_cotable *vcotbl = vmw_cotable(res);
+
+	if (id < 0 || id >= SVGA_COTABLE_MAX_IDS) {
+		DRM_ERROR("Illegal COTable id. Type is %u. Id is %d\n",
+			  (unsigned) vcotbl->type, id);
+		return -EINVAL;
+	}
+
+	if (vcotbl->seen_entries < id) {
+		/* Trigger a call to create() on next validate */
+		res->id = -1;
+		vcotbl->seen_entries = id;
+	}
+
+	return 0;
+}
+
+/**
+ * vmw_cotable_add_resource - add a view to the cotable's list of active views.
+ *
+ * @res: pointer struct vmw_resource representing the cotable.
+ * @head: pointer to the struct list_head member of the resource, dedicated
+ * to the cotable active resource list.
+ */
+void vmw_cotable_add_resource(struct vmw_resource *res, struct list_head *head)
+{
+	struct vmw_cotable *vcotbl =
+		container_of(res, struct vmw_cotable, res);
+
+	list_add_tail(head, &vcotbl->resource_list);
+}