drivers/gpu/drm/xe/xe_oa.c

// SPDX-License-Identifier: MIT
/*
 * Copyright © 2023-2024 Intel Corporation
 */

#include <linux/anon_inodes.h>
#include <linux/delay.h>
#include <linux/nospec.h>
#include <linux/poll.h>

#include <drm/drm_drv.h>
#include <drm/drm_gem.h>
#include <drm/drm_managed.h>
#include <drm/drm_syncobj.h>
#include <uapi/drm/xe_drm.h>

#include <generated/xe_wa_oob.h>
#include <generated/xe_device_wa_oob.h>

#include "abi/guc_actions_slpc_abi.h"
#include "instructions/xe_mi_commands.h"
#include "regs/xe_engine_regs.h"
#include "regs/xe_gt_regs.h"
#include "regs/xe_oa_regs.h"
#include "xe_assert.h"
#include "xe_bb.h"
#include "xe_bo.h"
#include "xe_device.h"
#include "xe_exec_queue.h"
#include "xe_force_wake.h"
#include "xe_gt.h"
#include "xe_gt_mcr.h"
#include "xe_gt_printk.h"
#include "xe_guc_rc.h"
#include "xe_macros.h"
#include "xe_mmio.h"
#include "xe_oa.h"
#include "xe_observation.h"
#include "xe_pm.h"
#include "xe_reg_whitelist.h"
#include "xe_sched_job.h"
#include "xe_sriov.h"
#include "xe_sync.h"
#include "xe_wa.h"

#define DEFAULT_POLL_FREQUENCY_HZ 200
#define DEFAULT_POLL_PERIOD_NS (NSEC_PER_SEC / DEFAULT_POLL_FREQUENCY_HZ)
#define XE_OA_UNIT_INVALID U32_MAX

enum xe_oam_unit_type {
	XE_OAM_UNIT_SAG,
	XE_OAM_UNIT_SCMI_0,
	XE_OAM_UNIT_SCMI_1,
};

enum xe_oa_submit_deps {
	XE_OA_SUBMIT_NO_DEPS,
	XE_OA_SUBMIT_ADD_DEPS,
};

enum xe_oa_user_extn_from {
	XE_OA_USER_EXTN_FROM_OPEN,
	XE_OA_USER_EXTN_FROM_CONFIG,
};

struct xe_oa_reg {
	struct xe_reg addr;
	u32 value;
};

struct xe_oa_config {
	struct xe_oa *oa;

	char uuid[UUID_STRING_LEN + 1];
	int id;

	const struct xe_oa_reg *regs;
	u32 regs_len;

	struct attribute_group sysfs_metric;
	struct attribute *attrs[2];
	struct kobj_attribute sysfs_metric_id;

	struct kref ref;
	struct rcu_head rcu;
};

struct xe_oa_open_param {
	struct xe_file *xef;
	struct xe_oa_unit *oa_unit;
	bool sample;
	u32 metric_set;
	enum xe_oa_format_name oa_format;
	int period_exponent;
	bool disabled;
	int exec_queue_id;
	int engine_instance;
	struct xe_exec_queue *exec_q;
	struct xe_hw_engine *hwe;
	bool no_preempt;
	struct drm_xe_sync __user *syncs_user;
	int num_syncs;
	struct xe_sync_entry *syncs;
	size_t oa_buffer_size;
	int wait_num_reports;
};

struct xe_oa_config_bo {
	struct llist_node node;

	struct xe_oa_config *oa_config;
	struct xe_bb *bb;
};

struct xe_oa_fence {
	/* @base: dma fence base */
	struct dma_fence base;
	/* @lock: lock for the fence */
	spinlock_t lock;
	/* @work: work to signal @base */
	struct delayed_work work;
	/* @cb: callback to schedule @work */
	struct dma_fence_cb cb;
};

#define DRM_FMT(x) DRM_XE_OA_FMT_TYPE_##x

static const struct xe_oa_format oa_formats[] = {
	[XE_OA_FORMAT_C4_B8]			= { 7, 64,  DRM_FMT(OAG) },
	[XE_OA_FORMAT_A12]			= { 0, 64,  DRM_FMT(OAG) },
	[XE_OA_FORMAT_A12_B8_C8]		= { 2, 128, DRM_FMT(OAG) },
	[XE_OA_FORMAT_A32u40_A4u32_B8_C8]	= { 5, 256, DRM_FMT(OAG) },
	[XE_OAR_FORMAT_A32u40_A4u32_B8_C8]	= { 5, 256, DRM_FMT(OAR) },
	[XE_OA_FORMAT_A24u40_A14u32_B8_C8]	= { 5, 256, DRM_FMT(OAG) },
	[XE_OAC_FORMAT_A24u64_B8_C8]		= { 1, 320, DRM_FMT(OAC), HDR_64_BIT },
	[XE_OAC_FORMAT_A22u32_R2u32_B8_C8]	= { 2, 192, DRM_FMT(OAC), HDR_64_BIT },
	[XE_OAM_FORMAT_MPEC8u64_B8_C8]		= { 1, 192, DRM_FMT(OAM_MPEC), HDR_64_BIT },
	[XE_OAM_FORMAT_MPEC8u32_B8_C8]		= { 2, 128, DRM_FMT(OAM_MPEC), HDR_64_BIT },
	[XE_OA_FORMAT_PEC64u64]			= { 1, 576, DRM_FMT(PEC), HDR_64_BIT, 1, 0 },
	[XE_OA_FORMAT_PEC64u64_B8_C8]		= { 1, 640, DRM_FMT(PEC), HDR_64_BIT, 1, 1 },
	[XE_OA_FORMAT_PEC64u32]			= { 1, 320, DRM_FMT(PEC), HDR_64_BIT },
	[XE_OA_FORMAT_PEC32u64_G1]		= { 5, 320, DRM_FMT(PEC), HDR_64_BIT, 1, 0 },
	[XE_OA_FORMAT_PEC32u32_G1]		= { 5, 192, DRM_FMT(PEC), HDR_64_BIT },
	[XE_OA_FORMAT_PEC32u64_G2]		= { 6, 320, DRM_FMT(PEC), HDR_64_BIT, 1, 0 },
	[XE_OA_FORMAT_PEC32u32_G2]		= { 6, 192, DRM_FMT(PEC), HDR_64_BIT },
	[XE_OA_FORMAT_PEC36u64_G1_32_G2_4]	= { 3, 320, DRM_FMT(PEC), HDR_64_BIT, 1, 0 },
	[XE_OA_FORMAT_PEC36u64_G1_4_G2_32]	= { 4, 320, DRM_FMT(PEC), HDR_64_BIT, 1, 0 },
};

static u32 xe_oa_circ_diff(struct xe_oa_stream *stream, u32 tail, u32 head)
{
	return tail >= head ? tail - head :
		tail + stream->oa_buffer.circ_size - head;
}

static u32 xe_oa_circ_incr(struct xe_oa_stream *stream, u32 ptr, u32 n)
{
	return ptr + n >= stream->oa_buffer.circ_size ?
		ptr + n - stream->oa_buffer.circ_size : ptr + n;
}

static void xe_oa_config_release(struct kref *ref)
{
	struct xe_oa_config *oa_config =
		container_of(ref, typeof(*oa_config), ref);

	kfree(oa_config->regs);

	kfree_rcu(oa_config, rcu);
}

static void xe_oa_config_put(struct xe_oa_config *oa_config)
{
	if (!oa_config)
		return;

	kref_put(&oa_config->ref, xe_oa_config_release);
}

static struct xe_oa_config *xe_oa_config_get(struct xe_oa_config *oa_config)
{
	return kref_get_unless_zero(&oa_config->ref) ? oa_config : NULL;
}

static struct xe_oa_config *xe_oa_get_oa_config(struct xe_oa *oa, int metrics_set)
{
	struct xe_oa_config *oa_config;

	rcu_read_lock();
	oa_config = idr_find(&oa->metrics_idr, metrics_set);
	if (oa_config)
		oa_config = xe_oa_config_get(oa_config);
	rcu_read_unlock();

	return oa_config;
}

static void free_oa_config_bo(struct xe_oa_config_bo *oa_bo, struct dma_fence *last_fence)
{
	xe_oa_config_put(oa_bo->oa_config);
	xe_bb_free(oa_bo->bb, last_fence);
	kfree(oa_bo);
}

static const struct xe_oa_regs *__oa_regs(struct xe_oa_stream *stream)
{
	return &stream->oa_unit->regs;
}

static u32 xe_oa_hw_tail_read(struct xe_oa_stream *stream)
{
	return xe_mmio_read32(&stream->gt->mmio, __oa_regs(stream)->oa_tail_ptr) &
		OAG_OATAILPTR_MASK;
}

#define oa_report_header_64bit(__s) \
	((__s)->oa_buffer.format->header == HDR_64_BIT)

static u64 oa_report_id(struct xe_oa_stream *stream, u32 report_offset)
{
	struct iosys_map *map = &stream->oa_buffer.bo->vmap;

	return oa_report_header_64bit(stream) ?
		xe_map_rd(stream->oa->xe, map, report_offset, u64) :
		xe_map_rd(stream->oa->xe, map, report_offset, u32);
}

static void oa_report_id_clear(struct xe_oa_stream *stream, u32 report_offset)
{
	struct iosys_map *map = &stream->oa_buffer.bo->vmap;

	oa_report_header_64bit(stream) ?
		xe_map_wr(stream->oa->xe, map, report_offset, u64, 0) :
		xe_map_wr(stream->oa->xe, map, report_offset, u32, 0);
}

static u64 oa_timestamp(struct xe_oa_stream *stream, u32 report_offset)
{
	struct iosys_map *map = &stream->oa_buffer.bo->vmap;

	return oa_report_header_64bit(stream) ?
		xe_map_rd(stream->oa->xe, map, report_offset + 8, u64) :
		xe_map_rd(stream->oa->xe, map, report_offset + 4, u32);
}

static void oa_timestamp_clear(struct xe_oa_stream *stream, u32 report_offset)
{
	struct iosys_map *map = &stream->oa_buffer.bo->vmap;

	oa_report_header_64bit(stream) ?
		xe_map_wr(stream->oa->xe, map, report_offset + 8, u64, 0) :
		xe_map_wr(stream->oa->xe, map, report_offset + 4, u32, 0);
}

static bool mert_wa_14026633728(struct xe_oa_stream *s)
{
	return s->oa_unit->type == DRM_XE_OA_UNIT_TYPE_MERT && XE_DEVICE_WA(s->oa->xe, 14026633728);
}

static bool xe_oa_buffer_check_unlocked(struct xe_oa_stream *stream)
{
	u32 gtt_offset = xe_bo_ggtt_addr(stream->oa_buffer.bo);
	u32 tail, hw_tail, partial_report_size, available;
	int report_size = stream->oa_buffer.format->size;
	unsigned long flags;

	spin_lock_irqsave(&stream->oa_buffer.ptr_lock, flags);

	hw_tail = xe_oa_hw_tail_read(stream);
	hw_tail -= gtt_offset;

	/*
	 * The tail pointer increases in 64 byte (cacheline size), not in report_size
	 * increments. Also report size may not be a power of 2. Compute potential
	 * partially landed report in OA buffer.
	 */
	partial_report_size = xe_oa_circ_diff(stream, hw_tail, stream->oa_buffer.tail);
	partial_report_size %= report_size;

	/* Subtract partial amount off the tail */
	hw_tail = xe_oa_circ_diff(stream, hw_tail, partial_report_size);

	tail = hw_tail;

	/*
	 * Walk the stream backward until we find a report with report id and timestamp
	 * not 0. We can't tell whether a report has fully landed in memory before the
	 * report id and timestamp of the following report have landed.
	 *
	 * This is assuming that the writes of the OA unit land in memory in the order
	 * they were written.  If not : (╯°□°）╯︵ ┻━┻
	 */
	while (xe_oa_circ_diff(stream, tail, stream->oa_buffer.tail) >= report_size) {
		if (oa_report_id(stream, tail) || oa_timestamp(stream, tail))
			break;

		tail = xe_oa_circ_diff(stream, tail, report_size);
	}

	if (xe_oa_circ_diff(stream, hw_tail, tail) > report_size)
		drm_dbg(&stream->oa->xe->drm,
			"unlanded report(s) head=0x%x tail=0x%x hw_tail=0x%x\n",
			stream->oa_buffer.head, tail, hw_tail);

	stream->oa_buffer.tail = tail;

	available = xe_oa_circ_diff(stream, stream->oa_buffer.tail, stream->oa_buffer.head);
	stream->pollin = available >= stream->wait_num_reports * report_size;

	spin_unlock_irqrestore(&stream->oa_buffer.ptr_lock, flags);

	return stream->pollin;
}

static enum hrtimer_restart xe_oa_poll_check_timer_cb(struct hrtimer *hrtimer)
{
	struct xe_oa_stream *stream =
		container_of(hrtimer, typeof(*stream), poll_check_timer);

	if (xe_oa_buffer_check_unlocked(stream))
		wake_up(&stream->poll_wq);

	hrtimer_forward_now(hrtimer, ns_to_ktime(stream->poll_period_ns));

	return HRTIMER_RESTART;
}

static unsigned long
xe_oa_copy_to_user(struct xe_oa_stream *stream, void __user *dst, u32 report_offset, u32 len)
{
	xe_assert(stream->oa->xe, len <= stream->oa_buffer.format->size);

	xe_map_memcpy_from(stream->oa->xe, stream->oa_buffer.bounce,
			   &stream->oa_buffer.bo->vmap, report_offset, len);
	return copy_to_user(dst, stream->oa_buffer.bounce, len);
}

static int xe_oa_append_report(struct xe_oa_stream *stream, char __user *buf,
			       size_t count, size_t *offset, u32 report_offset)
{
	int report_size = stream->oa_buffer.format->size;
	int report_size_partial;

	if ((count - *offset) < report_size)
		return -ENOSPC;

	buf += *offset;

	report_size_partial = stream->oa_buffer.circ_size - report_offset;

	if (report_size_partial < report_size) {
		if (xe_oa_copy_to_user(stream, buf, report_offset, report_size_partial))
			return -EFAULT;
		buf += report_size_partial;

		if (xe_oa_copy_to_user(stream, buf, 0, report_size - report_size_partial))
			return -EFAULT;
	} else if (xe_oa_copy_to_user(stream, buf, report_offset, report_size)) {
		return -EFAULT;
	}

	*offset += report_size;

	return 0;
}

static int xe_oa_append_reports(struct xe_oa_stream *stream, char __user *buf,
				size_t count, size_t *offset)
{
	int report_size = stream->oa_buffer.format->size;
	u32 gtt_offset = xe_bo_ggtt_addr(stream->oa_buffer.bo);
	size_t start_offset = *offset;
	unsigned long flags;
	u32 head, tail;
	int ret = 0;

	spin_lock_irqsave(&stream->oa_buffer.ptr_lock, flags);
	head = stream->oa_buffer.head;
	tail = stream->oa_buffer.tail;
	spin_unlock_irqrestore(&stream->oa_buffer.ptr_lock, flags);

	xe_assert(stream->oa->xe,
		  head < stream->oa_buffer.circ_size && tail < stream->oa_buffer.circ_size);

	for (; xe_oa_circ_diff(stream, tail, head);
	     head = xe_oa_circ_incr(stream, head, report_size)) {
		ret = xe_oa_append_report(stream, buf, count, offset, head);
		if (ret)
			break;

		if (!(stream->oa_buffer.circ_size % report_size)) {
			/* Clear out report id and timestamp to detect unlanded reports */
			oa_report_id_clear(stream, head);
			oa_timestamp_clear(stream, head);
		} else {
			struct iosys_map *map = &stream->oa_buffer.bo->vmap;
			u32 part = stream->oa_buffer.circ_size - head;

			/* Zero out the entire report */
			if (report_size <= part) {
				xe_map_memset(stream->oa->xe, map, head, 0, report_size);
			} else {
				xe_map_memset(stream->oa->xe, map, head, 0, part);
				xe_map_memset(stream->oa->xe, map, 0, 0, report_size - part);
			}
		}
	}

	if (start_offset != *offset) {
		struct xe_reg oaheadptr = __oa_regs(stream)->oa_head_ptr;

		spin_lock_irqsave(&stream->oa_buffer.ptr_lock, flags);
		xe_mmio_write32(&stream->gt->mmio, oaheadptr,
				(head + gtt_offset) & OAG_OAHEADPTR_MASK);
		stream->oa_buffer.head = head;
		spin_unlock_irqrestore(&stream->oa_buffer.ptr_lock, flags);
	}

	return ret;
}

static void xe_oa_init_oa_buffer(struct xe_oa_stream *stream)
{
	u32 gtt_offset = xe_bo_ggtt_addr(stream->oa_buffer.bo);
	int size_exponent = __ffs(xe_bo_size(stream->oa_buffer.bo));
	u32 oa_buf = gtt_offset | OAG_OABUFFER_MEMORY_SELECT;
	struct xe_mmio *mmio = &stream->gt->mmio;
	unsigned long flags;

	/*
	 * If oa buffer size is more than 16MB (exponent greater than 24), the
	 * oa buffer size field is multiplied by 8 in xe_oa_enable_metric_set.
	 */
	oa_buf |= REG_FIELD_PREP(OABUFFER_SIZE_MASK,
		size_exponent > 24 ? size_exponent - 20 : size_exponent - 17);

	spin_lock_irqsave(&stream->oa_buffer.ptr_lock, flags);

	xe_mmio_write32(mmio, __oa_regs(stream)->oa_status, 0);
	xe_mmio_write32(mmio, __oa_regs(stream)->oa_head_ptr,
			gtt_offset & OAG_OAHEADPTR_MASK);
	stream->oa_buffer.head = 0;
	/*
	 * PRM says: "This MMIO must be set before the OATAILPTR register and after the
	 * OAHEADPTR register. This is to enable proper functionality of the overflow bit".
	 */
	xe_mmio_write32(mmio, __oa_regs(stream)->oa_buffer, oa_buf);
	xe_mmio_write32(mmio, __oa_regs(stream)->oa_tail_ptr,
			gtt_offset & OAG_OATAILPTR_MASK);

	/* Mark that we need updated tail pointer to read from */
	stream->oa_buffer.tail = 0;

	spin_unlock_irqrestore(&stream->oa_buffer.ptr_lock, flags);

	/* Zero out the OA buffer since we rely on zero report id and timestamp fields */
	xe_map_memset(stream->oa->xe, &stream->oa_buffer.bo->vmap, 0, 0,
		      xe_bo_size(stream->oa_buffer.bo));
}

static u32 __format_to_oactrl(const struct xe_oa_format *format, int counter_sel_mask)
{
	return ((format->counter_select << (ffs(counter_sel_mask) - 1)) & counter_sel_mask) |
		REG_FIELD_PREP(OA_OACONTROL_REPORT_BC_MASK, format->bc_report) |
		REG_FIELD_PREP(OA_OACONTROL_COUNTER_SIZE_MASK, format->counter_size);
}

static u32 __oa_ccs_select(struct xe_oa_stream *stream)
{
	u32 val;

	if (stream->hwe->class != XE_ENGINE_CLASS_COMPUTE)
		return 0;

	val = REG_FIELD_PREP(OAG_OACONTROL_OA_CCS_SELECT_MASK, stream->hwe->instance);
	xe_assert(stream->oa->xe,
		  REG_FIELD_GET(OAG_OACONTROL_OA_CCS_SELECT_MASK, val) == stream->hwe->instance);
	return val;
}

static u32 __oactrl_used_bits(struct xe_oa_stream *stream)
{
	return stream->oa_unit->type == DRM_XE_OA_UNIT_TYPE_OAG ?
		OAG_OACONTROL_USED_BITS : OAM_OACONTROL_USED_BITS;
}

static void xe_oa_enable(struct xe_oa_stream *stream)
{
	const struct xe_oa_format *format = stream->oa_buffer.format;
	const struct xe_oa_regs *regs;
	u32 val;

	/*
	 * BSpec: 46822: Bit 0. Even if stream->sample is 0, for OAR to function, the OA
	 * buffer must be correctly initialized
	 */
	xe_oa_init_oa_buffer(stream);

	regs = __oa_regs(stream);
	val = __format_to_oactrl(format, regs->oa_ctrl_counter_select_mask) |
		__oa_ccs_select(stream) | OAG_OACONTROL_OA_COUNTER_ENABLE;

	if (GRAPHICS_VER(stream->oa->xe) >= 20 &&
	    stream->oa_unit->type == DRM_XE_OA_UNIT_TYPE_OAG)
		val |= OAG_OACONTROL_OA_PES_DISAG_EN;

	xe_mmio_rmw32(&stream->gt->mmio, regs->oa_ctrl, __oactrl_used_bits(stream), val);
}

static void xe_oa_disable(struct xe_oa_stream *stream)
{
	struct xe_mmio *mmio = &stream->gt->mmio;

	xe_mmio_rmw32(mmio, __oa_regs(stream)->oa_ctrl, __oactrl_used_bits(stream), 0);
	if (xe_mmio_wait32(mmio, __oa_regs(stream)->oa_ctrl,
			   OAG_OACONTROL_OA_COUNTER_ENABLE, 0, 50000, NULL, false))
		drm_err(&stream->oa->xe->drm,
			"wait for OA to be disabled timed out\n");

	if (GRAPHICS_VERx100(stream->oa->xe) <= 1270 && GRAPHICS_VERx100(stream->oa->xe) != 1260) {
		/* <= XE_METEORLAKE except XE_PVC */
		xe_mmio_write32(mmio, OA_TLB_INV_CR, 1);
		if (xe_mmio_wait32(mmio, OA_TLB_INV_CR, 1, 0, 50000, NULL, false))
			drm_err(&stream->oa->xe->drm,
				"wait for OA tlb invalidate timed out\n");
	}
}

static int xe_oa_wait_unlocked(struct xe_oa_stream *stream)
{
	/* We might wait indefinitely if periodic sampling is not enabled */
	if (!stream->periodic)
		return -EINVAL;

	return wait_event_interruptible(stream->poll_wq,
					xe_oa_buffer_check_unlocked(stream));
}

#define OASTATUS_RELEVANT_BITS (OASTATUS_MMIO_TRG_Q_FULL | OASTATUS_COUNTER_OVERFLOW | \
				OASTATUS_BUFFER_OVERFLOW | OASTATUS_REPORT_LOST)

static int __xe_oa_read(struct xe_oa_stream *stream, char __user *buf,
			size_t count, size_t *offset)
{
	/* Only clear our bits to avoid side-effects */
	stream->oa_status = xe_mmio_rmw32(&stream->gt->mmio, __oa_regs(stream)->oa_status,
					  OASTATUS_RELEVANT_BITS, 0);
	/*
	 * Signal to userspace that there is non-zero OA status to read via
	 * @DRM_XE_OBSERVATION_IOCTL_STATUS observation stream fd ioctl
	 */
	if (stream->oa_status & OASTATUS_RELEVANT_BITS)
		return -EIO;

	return xe_oa_append_reports(stream, buf, count, offset);
}

static ssize_t xe_oa_read(struct file *file, char __user *buf,
			  size_t count, loff_t *ppos)
{
	struct xe_oa_stream *stream = file->private_data;
	size_t offset = 0;
	int ret;

	if (!stream->sample)
		return -EINVAL;

	if (!(file->f_flags & O_NONBLOCK)) {
		do {
			ret = xe_oa_wait_unlocked(stream);
			if (ret)
				return ret;

			mutex_lock(&stream->stream_lock);
			ret = __xe_oa_read(stream, buf, count, &offset);
			mutex_unlock(&stream->stream_lock);
		} while (!offset && !ret);
	} else {
		xe_oa_buffer_check_unlocked(stream);
		mutex_lock(&stream->stream_lock);
		ret = __xe_oa_read(stream, buf, count, &offset);
		mutex_unlock(&stream->stream_lock);
	}

	/*
	 * Typically we clear pollin here in order to wait for the new hrtimer callback
	 * before unblocking. The exception to this is if __xe_oa_read returns -ENOSPC,
	 * which means that more OA data is available than could fit in the user provided
	 * buffer. In this case we want the next poll() call to not block.
	 *
	 * Also in case of -EIO, we have already waited for data before returning
	 * -EIO, so need to wait again
	 */
	if (ret != -ENOSPC && ret != -EIO)
		stream->pollin = false;

	/* Possible values for ret are 0, -EFAULT, -ENOSPC, -EIO, -EINVAL, ... */
	return offset ?: (ret ?: -EAGAIN);
}

static __poll_t xe_oa_poll_locked(struct xe_oa_stream *stream,
				  struct file *file, poll_table *wait)
{
	__poll_t events = 0;

	poll_wait(file, &stream->poll_wq, wait);

	/*
	 * We don't explicitly check whether there's something to read here since this
	 * path may be hot depending on what else userspace is polling, or on the timeout
	 * in use. We rely on hrtimer xe_oa_poll_check_timer_cb to notify us when there
	 * are samples to read
	 */
	if (stream->pollin)
		events |= EPOLLIN;

	return events;
}

static __poll_t xe_oa_poll(struct file *file, poll_table *wait)
{
	struct xe_oa_stream *stream = file->private_data;
	__poll_t ret;

	mutex_lock(&stream->stream_lock);
	ret = xe_oa_poll_locked(stream, file, wait);
	mutex_unlock(&stream->stream_lock);

	return ret;
}

static void xe_oa_lock_vma(struct xe_exec_queue *q)
{
	if (q->vm) {
		down_read(&q->vm->lock);
		xe_vm_lock(q->vm, false);
	}
}

static void xe_oa_unlock_vma(struct xe_exec_queue *q)
{
	if (q->vm) {
		xe_vm_unlock(q->vm);
		up_read(&q->vm->lock);
	}
}

static struct dma_fence *xe_oa_submit_bb(struct xe_oa_stream *stream, enum xe_oa_submit_deps deps,
					 struct xe_bb *bb)
{
	struct xe_exec_queue *q = stream->exec_q ?: stream->k_exec_q;
	struct xe_sched_job *job;
	struct dma_fence *fence;
	int err = 0;

	xe_oa_lock_vma(q);

	job = xe_bb_create_job(q, bb);
	if (IS_ERR(job)) {
		err = PTR_ERR(job);
		goto exit;
	}
	job->ggtt = true;

	if (deps == XE_OA_SUBMIT_ADD_DEPS) {
		for (int i = 0; i < stream->num_syncs && !err; i++)
			err = xe_sync_entry_add_deps(&stream->syncs[i], job);
		if (err) {
			drm_dbg(&stream->oa->xe->drm, "xe_sync_entry_add_deps err %d\n", err);
			goto err_put_job;
		}
	}

	xe_sched_job_arm(job);
	fence = dma_fence_get(&job->drm.s_fence->finished);
	xe_sched_job_push(job);

	xe_oa_unlock_vma(q);

	return fence;
err_put_job:
	xe_sched_job_put(job);
exit:
	xe_oa_unlock_vma(q);
	return ERR_PTR(err);
}

static void write_cs_mi_lri(struct xe_bb *bb, const struct xe_oa_reg *reg_data, u32 n_regs)
{
	u32 i;

#define MI_LOAD_REGISTER_IMM_MAX_REGS (126)

	for (i = 0; i < n_regs; i++) {
		if ((i % MI_LOAD_REGISTER_IMM_MAX_REGS) == 0) {
			u32 n_lri = min_t(u32, n_regs - i,
					  MI_LOAD_REGISTER_IMM_MAX_REGS);

			bb->cs[bb->len++] = MI_LOAD_REGISTER_IMM | MI_LRI_NUM_REGS(n_lri);
		}
		bb->cs[bb->len++] = reg_data[i].addr.addr;
		bb->cs[bb->len++] = reg_data[i].value;
	}
}

static int num_lri_dwords(int num_regs)
{
	int count = 0;

	if (num_regs > 0) {
		count += DIV_ROUND_UP(num_regs, MI_LOAD_REGISTER_IMM_MAX_REGS);
		count += num_regs * 2;
	}

	return count;
}

static void xe_oa_free_oa_buffer(struct xe_oa_stream *stream)
{
	xe_bo_unpin_map_no_vm(stream->oa_buffer.bo);
	kfree(stream->oa_buffer.bounce);
}

static void xe_oa_free_configs(struct xe_oa_stream *stream)
{
	struct xe_oa_config_bo *oa_bo, *tmp;

	xe_oa_config_put(stream->oa_config);
	llist_for_each_entry_safe(oa_bo, tmp, stream->oa_config_bos.first, node)
		free_oa_config_bo(oa_bo, stream->last_fence);
	dma_fence_put(stream->last_fence);
}

static int xe_oa_load_with_lri(struct xe_oa_stream *stream, struct xe_oa_reg *reg_lri, u32 count)
{
	struct dma_fence *fence;
	struct xe_bb *bb;
	int err;

	bb = xe_bb_new(stream->gt, 2 * count + 1, false);
	if (IS_ERR(bb)) {
		err = PTR_ERR(bb);
		goto exit;
	}

	write_cs_mi_lri(bb, reg_lri, count);

	fence = xe_oa_submit_bb(stream, XE_OA_SUBMIT_NO_DEPS, bb);
	if (IS_ERR(fence)) {
		err = PTR_ERR(fence);
		goto free_bb;
	}
	xe_bb_free(bb, fence);
	dma_fence_put(fence);

	return 0;
free_bb:
	xe_bb_free(bb, NULL);
exit:
	return err;
}

static int xe_oa_configure_oar_context(struct xe_oa_stream *stream, bool enable)
{
	const struct xe_oa_format *format = stream->oa_buffer.format;
	u32 oacontrol = __format_to_oactrl(format, OAR_OACONTROL_COUNTER_SEL_MASK) |
		(enable ? OAR_OACONTROL_COUNTER_ENABLE : 0);

	struct xe_oa_reg reg_lri[] = {
		{
			OACTXCONTROL(stream->hwe->mmio_base),
			enable ? OA_COUNTER_RESUME : 0,
		},
		{
			OAR_OACONTROL,
			oacontrol,
		},
		{
			RING_CONTEXT_CONTROL(stream->hwe->mmio_base),
			enable ?
			REG_MASKED_FIELD_ENABLE(CTX_CTRL_OAC_CONTEXT_ENABLE) :
			REG_MASKED_FIELD_DISABLE(CTX_CTRL_OAC_CONTEXT_ENABLE)
		},
	};

	return xe_oa_load_with_lri(stream, reg_lri, ARRAY_SIZE(reg_lri));
}

static int xe_oa_configure_oac_context(struct xe_oa_stream *stream, bool enable)
{
	const struct xe_oa_format *format = stream->oa_buffer.format;
	u32 oacontrol = __format_to_oactrl(format, OAR_OACONTROL_COUNTER_SEL_MASK) |
		(enable ? OAR_OACONTROL_COUNTER_ENABLE : 0);
	struct xe_oa_reg reg_lri[] = {
		{
			OACTXCONTROL(stream->hwe->mmio_base),
			enable ? OA_COUNTER_RESUME : 0,
		},
		{
			OAC_OACONTROL,
			oacontrol
		},
		{
			RING_CONTEXT_CONTROL(stream->hwe->mmio_base),
			enable ?
			REG_MASKED_FIELD_ENABLE(CTX_CTRL_OAC_CONTEXT_ENABLE | CTX_CTRL_RUN_ALONE) :
			REG_MASKED_FIELD_DISABLE(CTX_CTRL_OAC_CONTEXT_ENABLE | CTX_CTRL_RUN_ALONE),
		},
	};

	/* Set ccs select to enable programming of OAC_OACONTROL */
	xe_mmio_write32(&stream->gt->mmio, __oa_regs(stream)->oa_ctrl,
			__oa_ccs_select(stream));

	return xe_oa_load_with_lri(stream, reg_lri, ARRAY_SIZE(reg_lri));
}

static int xe_oa_configure_oa_context(struct xe_oa_stream *stream, bool enable)
{
	switch (stream->hwe->class) {
	case XE_ENGINE_CLASS_RENDER:
		return xe_oa_configure_oar_context(stream, enable);
	case XE_ENGINE_CLASS_COMPUTE:
		return xe_oa_configure_oac_context(stream, enable);
	default:
		/* Video engines do not support MI_REPORT_PERF_COUNT */
		return 0;
	}
}

#define HAS_OA_BPC_REPORTING(xe) (GRAPHICS_VERx100(xe) >= 1255)

static u32 oag_configure_mmio_trigger(const struct xe_oa_stream *stream, bool enable)
{
	if (enable && stream && stream->sample)
		return REG_MASKED_FIELD_DISABLE(OAG_OA_DEBUG_DISABLE_MMIO_TRG);
	else
		return REG_MASKED_FIELD_ENABLE(OAG_OA_DEBUG_DISABLE_MMIO_TRG);
}

static void xe_oa_disable_metric_set(struct xe_oa_stream *stream)
{
	struct xe_mmio *mmio = &stream->gt->mmio;
	u32 sqcnt1;

	/* Enable thread stall DOP gating and EU DOP gating. */
	if (XE_GT_WA(stream->gt, 1508761755)) {
		xe_gt_mcr_multicast_write(stream->gt, ROW_CHICKEN,
					  REG_MASKED_FIELD_DISABLE(STALL_DOP_GATING_DISABLE));
		xe_gt_mcr_multicast_write(stream->gt, ROW_CHICKEN2,
					  REG_MASKED_FIELD_DISABLE(DISABLE_DOP_GATING));
	}

	xe_mmio_write32(mmio, __oa_regs(stream)->oa_debug,
			oag_configure_mmio_trigger(stream, false));

	/* disable the context save/restore or OAR counters */
	if (stream->exec_q)
		xe_oa_configure_oa_context(stream, false);

	/* Make sure we disable noa to save power. */
	if (GT_VER(stream->gt) < 35)
		xe_mmio_rmw32(mmio, RPM_CONFIG1, GT_NOA_ENABLE, 0);

	sqcnt1 = SQCNT1_PMON_ENABLE |
		 (HAS_OA_BPC_REPORTING(stream->oa->xe) ? SQCNT1_OABPC : 0);

	/* Reset PMON Enable to save power. */
	xe_mmio_rmw32(mmio, XELPMP_SQCNT1, sqcnt1, 0);

	if ((stream->oa_unit->type == DRM_XE_OA_UNIT_TYPE_OAM ||
	     stream->oa_unit->type == DRM_XE_OA_UNIT_TYPE_OAM_SAG) &&
	    GRAPHICS_VER(stream->oa->xe) >= 30)
		xe_mmio_rmw32(mmio, OAM_COMPRESSION_T3_CONTROL, OAM_LAT_MEASURE_ENABLE, 0);
}

static void xe_oa_stream_destroy(struct xe_oa_stream *stream)
{
	struct xe_oa_unit *u = stream->oa_unit;
	struct xe_gt *gt = stream->hwe->gt;

	if (WARN_ON(stream != u->exclusive_stream))
		return;

	WRITE_ONCE(u->exclusive_stream, NULL);

	mutex_destroy(&stream->stream_lock);

	if (stream->sample)
		xe_reg_dewhitelist_oa_regs(stream->gt);

	xe_oa_disable_metric_set(stream);
	xe_exec_queue_put(stream->k_exec_q);

	xe_oa_free_oa_buffer(stream);

	xe_force_wake_put(gt_to_fw(gt), stream->fw_ref);
	xe_pm_runtime_put(stream->oa->xe);

	xe_oa_free_configs(stream);
	xe_file_put(stream->xef);
}

static int xe_oa_alloc_oa_buffer(struct xe_oa_stream *stream, size_t size)
{
	u32 vram = mert_wa_14026633728(stream) ?
		XE_BO_FLAG_VRAM_IF_DGFX(xe_device_get_root_tile(stream->oa->xe)) :
		XE_BO_FLAG_SYSTEM;
	struct xe_bo *bo;

	bo = xe_bo_create_pin_map_novm(stream->oa->xe, stream->gt->tile,
				       size, ttm_bo_type_kernel,
				       vram | XE_BO_FLAG_GGTT, false);
	if (IS_ERR(bo))
		return PTR_ERR(bo);

	/*
	 * ttm_bo_type_kernel BOs are not zeroed on allocation, so the buffer can
	 * hold stale data from previously freed pages. Since the OA buffer is
	 * mmap'able by userspace, clear it here to avoid leaking kernel memory.
	 */
	xe_map_memset(stream->oa->xe, &bo->vmap, 0, 0, xe_bo_size(bo));

	stream->oa_buffer.bo = bo;

	stream->oa_buffer.bounce = kmalloc(stream->oa_buffer.format->size, GFP_KERNEL);
	if (!stream->oa_buffer.bounce) {
		xe_bo_unpin_map_no_vm(stream->oa_buffer.bo);
		return -ENOMEM;
	}

	return 0;
}

static struct xe_oa_config_bo *
__xe_oa_alloc_config_buffer(struct xe_oa_stream *stream, struct xe_oa_config *oa_config)
{
	struct xe_oa_config_bo *oa_bo;
	size_t config_length;
	struct xe_bb *bb;

	oa_bo = kzalloc_obj(*oa_bo);
	if (!oa_bo)
		return ERR_PTR(-ENOMEM);

	config_length = num_lri_dwords(oa_config->regs_len);
	config_length = ALIGN(sizeof(u32) * config_length, XE_PAGE_SIZE) / sizeof(u32);

	bb = xe_bb_new(stream->gt, config_length, false);
	if (IS_ERR(bb))
		goto err_free;

	write_cs_mi_lri(bb, oa_config->regs, oa_config->regs_len);

	oa_bo->bb = bb;
	oa_bo->oa_config = xe_oa_config_get(oa_config);
	llist_add(&oa_bo->node, &stream->oa_config_bos);

	return oa_bo;
err_free:
	kfree(oa_bo);
	return ERR_CAST(bb);
}

static struct xe_oa_config_bo *
xe_oa_alloc_config_buffer(struct xe_oa_stream *stream, struct xe_oa_config *oa_config)
{
	struct xe_oa_config_bo *oa_bo;

	/* Look for the buffer in the already allocated BOs attached to the stream */
	llist_for_each_entry(oa_bo, stream->oa_config_bos.first, node) {
		if (oa_bo->oa_config == oa_config &&
		    memcmp(oa_bo->oa_config->uuid, oa_config->uuid,
			   sizeof(oa_config->uuid)) == 0)
			goto out;
	}

	oa_bo = __xe_oa_alloc_config_buffer(stream, oa_config);
out:
	return oa_bo;
}

static void xe_oa_update_last_fence(struct xe_oa_stream *stream, struct dma_fence *fence)
{
	dma_fence_put(stream->last_fence);
	stream->last_fence = dma_fence_get(fence);
}

static void xe_oa_fence_work_fn(struct work_struct *w)
{
	struct xe_oa_fence *ofence = container_of(w, typeof(*ofence), work.work);

	/* Signal fence to indicate new OA configuration is active */
	dma_fence_signal(&ofence->base);
	dma_fence_put(&ofence->base);
}

static void xe_oa_config_cb(struct dma_fence *fence, struct dma_fence_cb *cb)
{
	/* Additional empirical delay needed for NOA programming after registers are written */
#define NOA_PROGRAM_ADDITIONAL_DELAY_US 500

	struct xe_oa_fence *ofence = container_of(cb, typeof(*ofence), cb);

	INIT_DELAYED_WORK(&ofence->work, xe_oa_fence_work_fn);
	queue_delayed_work(system_dfl_wq, &ofence->work,
			   usecs_to_jiffies(NOA_PROGRAM_ADDITIONAL_DELAY_US));
	dma_fence_put(fence);
}

static const char *xe_oa_get_driver_name(struct dma_fence *fence)
{
	return "xe_oa";
}

static const char *xe_oa_get_timeline_name(struct dma_fence *fence)
{
	return "unbound";
}

static const struct dma_fence_ops xe_oa_fence_ops = {
	.get_driver_name = xe_oa_get_driver_name,
	.get_timeline_name = xe_oa_get_timeline_name,
};

static int xe_oa_emit_oa_config(struct xe_oa_stream *stream, struct xe_oa_config *config)
{
#define NOA_PROGRAM_ADDITIONAL_DELAY_US 500
	struct xe_oa_config_bo *oa_bo;
	struct xe_oa_fence *ofence;
	int i, err, num_signal = 0;
	struct dma_fence *fence;

	ofence = kzalloc_obj(*ofence);
	if (!ofence) {
		err = -ENOMEM;
		goto exit;
	}

	oa_bo = xe_oa_alloc_config_buffer(stream, config);
	if (IS_ERR(oa_bo)) {
		err = PTR_ERR(oa_bo);
		goto exit;
	}

	/* Emit OA configuration batch */
	fence = xe_oa_submit_bb(stream, XE_OA_SUBMIT_ADD_DEPS, oa_bo->bb);
	if (IS_ERR(fence)) {
		err = PTR_ERR(fence);
		goto exit;
	}

	/* Point of no return: initialize and set fence to signal */
	spin_lock_init(&ofence->lock);
	dma_fence_init(&ofence->base, &xe_oa_fence_ops, &ofence->lock, 0, 0);

	for (i = 0; i < stream->num_syncs; i++) {
		if (stream->syncs[i].flags & DRM_XE_SYNC_FLAG_SIGNAL)
			num_signal++;
		xe_sync_entry_signal(&stream->syncs[i], &ofence->base);
	}

	/* Additional dma_fence_get in case we dma_fence_wait */
	if (!num_signal)
		dma_fence_get(&ofence->base);

	/* Update last fence too before adding callback */
	xe_oa_update_last_fence(stream, fence);

	/* Add job fence callback to schedule work to signal ofence->base */
	err = dma_fence_add_callback(fence, &ofence->cb, xe_oa_config_cb);
	xe_gt_assert(stream->gt, !err || err == -ENOENT);
	if (err == -ENOENT)
		xe_oa_config_cb(fence, &ofence->cb);

	/* If nothing needs to be signaled we wait synchronously */
	if (!num_signal) {
		dma_fence_wait(&ofence->base, false);
		dma_fence_put(&ofence->base);
	}

	/* Done with syncs */
	for (i = 0; i < stream->num_syncs; i++)
		xe_sync_entry_cleanup(&stream->syncs[i]);
	kfree(stream->syncs);

	return 0;
exit:
	kfree(ofence);
	return err;
}

static u32 oag_report_ctx_switches(const struct xe_oa_stream *stream)
{
	/* If user didn't require OA reports, ask HW not to emit ctx switch reports */
	if (stream->sample)
		return REG_MASKED_FIELD_DISABLE(OAG_OA_DEBUG_DISABLE_CTX_SWITCH_REPORTS);
	else
		return REG_MASKED_FIELD_ENABLE(OAG_OA_DEBUG_DISABLE_CTX_SWITCH_REPORTS);
}

static u32 oag_buf_size_select(const struct xe_oa_stream *stream)
{
	if (xe_bo_size(stream->oa_buffer.bo) > SZ_16M)
		return REG_MASKED_FIELD_ENABLE(OAG_OA_DEBUG_BUF_SIZE_SELECT);
	else
		return REG_MASKED_FIELD_DISABLE(OAG_OA_DEBUG_BUF_SIZE_SELECT);
}

static int xe_oa_enable_metric_set(struct xe_oa_stream *stream)
{
	struct xe_mmio *mmio = &stream->gt->mmio;
	u32 oa_debug, sqcnt1;
	int ret;

	/*
	 * EU NOA signals behave incorrectly if EU clock gating is enabled.
	 * Disable thread stall DOP gating and EU DOP gating.
	 */
	if (XE_GT_WA(stream->gt, 1508761755)) {
		xe_gt_mcr_multicast_write(stream->gt, ROW_CHICKEN,
					  REG_MASKED_FIELD_ENABLE(STALL_DOP_GATING_DISABLE));
		xe_gt_mcr_multicast_write(stream->gt, ROW_CHICKEN2,
					  REG_MASKED_FIELD_ENABLE(DISABLE_DOP_GATING));
	}

	/* Disable clk ratio reports */
	oa_debug = OAG_OA_DEBUG_DISABLE_CLK_RATIO_REPORTS |
		OAG_OA_DEBUG_INCLUDE_CLK_RATIO;

	if (GRAPHICS_VER(stream->oa->xe) >= 20)
		oa_debug |=
			/* The three bits below are needed to get PEC counters running */
			OAG_OA_DEBUG_START_TRIGGER_SCOPE_CONTROL |
			OAG_OA_DEBUG_DISABLE_START_TRG_2_COUNT_QUAL |
			OAG_OA_DEBUG_DISABLE_START_TRG_1_COUNT_QUAL;

	xe_mmio_write32(mmio, __oa_regs(stream)->oa_debug,
			REG_MASKED_FIELD_ENABLE(oa_debug) |
			oag_report_ctx_switches(stream) |
			oag_buf_size_select(stream) |
			oag_configure_mmio_trigger(stream, true));

	xe_mmio_write32(mmio, __oa_regs(stream)->oa_ctx_ctrl,
			OAG_OAGLBCTXCTRL_COUNTER_RESUME |
			(stream->periodic ?
			 OAG_OAGLBCTXCTRL_TIMER_ENABLE |
			 REG_FIELD_PREP(OAG_OAGLBCTXCTRL_TIMER_PERIOD_MASK,
					 stream->period_exponent) : 0));

	/*
	 * Initialize Super Queue Internal Cnt Register
	 * Set PMON Enable in order to collect valid metrics
	 * Enable bytes per clock reporting
	 */
	sqcnt1 = SQCNT1_PMON_ENABLE |
		 (HAS_OA_BPC_REPORTING(stream->oa->xe) ? SQCNT1_OABPC : 0);
	xe_mmio_rmw32(mmio, XELPMP_SQCNT1, 0, sqcnt1);

	if ((stream->oa_unit->type == DRM_XE_OA_UNIT_TYPE_OAM ||
	     stream->oa_unit->type == DRM_XE_OA_UNIT_TYPE_OAM_SAG) &&
	    GRAPHICS_VER(stream->oa->xe) >= 30)
		xe_mmio_rmw32(mmio, OAM_COMPRESSION_T3_CONTROL, 0, OAM_LAT_MEASURE_ENABLE);

	/* Configure OAR/OAC */
	if (stream->exec_q) {
		ret = xe_oa_configure_oa_context(stream, true);
		if (ret)
			return ret;
	}

	return xe_oa_emit_oa_config(stream, stream->oa_config);
}

static int decode_oa_format(struct xe_oa *oa, u64 fmt, enum xe_oa_format_name *name)
{
	u32 counter_size = FIELD_GET(DRM_XE_OA_FORMAT_MASK_COUNTER_SIZE, fmt);
	u32 counter_sel = FIELD_GET(DRM_XE_OA_FORMAT_MASK_COUNTER_SEL, fmt);
	u32 bc_report = FIELD_GET(DRM_XE_OA_FORMAT_MASK_BC_REPORT, fmt);
	u32 type = FIELD_GET(DRM_XE_OA_FORMAT_MASK_FMT_TYPE, fmt);
	int idx;

	for_each_set_bit(idx, oa->format_mask, __XE_OA_FORMAT_MAX) {
		const struct xe_oa_format *f = &oa->oa_formats[idx];

		if (counter_size == f->counter_size && bc_report == f->bc_report &&
		    type == f->type && counter_sel == f->counter_select) {
			*name = idx;
			return 0;
		}
	}

	return -EINVAL;
}

static struct xe_oa_unit *xe_oa_lookup_oa_unit(struct xe_oa *oa, u32 oa_unit_id)
{
	struct xe_gt *gt;
	int gt_id, i;

	for_each_gt(gt, oa->xe, gt_id) {
		for (i = 0; i < gt->oa.num_oa_units; i++) {
			struct xe_oa_unit *u = &gt->oa.oa_unit[i];

			if (u->oa_unit_id == oa_unit_id)
				return u;
		}
	}

	return NULL;
}

static int xe_oa_set_prop_oa_unit_id(struct xe_oa *oa, u64 value,
				     struct xe_oa_open_param *param)
{
	param->oa_unit = xe_oa_lookup_oa_unit(oa, value);
	if (!param->oa_unit) {
		drm_dbg(&oa->xe->drm, "OA unit ID out of range %lld\n", value);
		return -EINVAL;
	}
	return 0;
}

static int xe_oa_set_prop_sample_oa(struct xe_oa *oa, u64 value,
				    struct xe_oa_open_param *param)
{
	param->sample = value;
	return 0;
}

static int xe_oa_set_prop_metric_set(struct xe_oa *oa, u64 value,
				     struct xe_oa_open_param *param)
{
	param->metric_set = value;
	return 0;
}

static int xe_oa_set_prop_oa_format(struct xe_oa *oa, u64 value,
				    struct xe_oa_open_param *param)
{
	int ret = decode_oa_format(oa, value, &param->oa_format);

	if (ret) {
		drm_dbg(&oa->xe->drm, "Unsupported OA report format %#llx\n", value);
		return ret;
	}
	return 0;
}

static int xe_oa_set_prop_oa_exponent(struct xe_oa *oa, u64 value,
				      struct xe_oa_open_param *param)
{
#define OA_EXPONENT_MAX 31

	if (value > OA_EXPONENT_MAX) {
		drm_dbg(&oa->xe->drm, "OA timer exponent too high (> %u)\n", OA_EXPONENT_MAX);
		return -EINVAL;
	}
	param->period_exponent = value;
	return 0;
}

static int xe_oa_set_prop_disabled(struct xe_oa *oa, u64 value,
				   struct xe_oa_open_param *param)
{
	param->disabled = value;
	return 0;
}

static int xe_oa_set_prop_exec_queue_id(struct xe_oa *oa, u64 value,
					struct xe_oa_open_param *param)
{
	param->exec_queue_id = value;
	return 0;
}

static int xe_oa_set_prop_engine_instance(struct xe_oa *oa, u64 value,
					  struct xe_oa_open_param *param)
{
	param->engine_instance = value;
	return 0;
}

static int xe_oa_set_no_preempt(struct xe_oa *oa, u64 value,
				struct xe_oa_open_param *param)
{
	param->no_preempt = value;
	return 0;
}

static int xe_oa_set_prop_num_syncs(struct xe_oa *oa, u64 value,
				    struct xe_oa_open_param *param)
{
	if (XE_IOCTL_DBG(oa->xe, value > DRM_XE_MAX_SYNCS))
		return -EINVAL;

	param->num_syncs = value;
	return 0;
}

static int xe_oa_set_prop_syncs_user(struct xe_oa *oa, u64 value,
				     struct xe_oa_open_param *param)
{
	param->syncs_user = u64_to_user_ptr(value);
	return 0;
}

static int xe_oa_set_prop_oa_buffer_size(struct xe_oa *oa, u64 value,
					 struct xe_oa_open_param *param)
{
	if (!is_power_of_2(value) || value < SZ_128K || value > SZ_128M) {
		drm_dbg(&oa->xe->drm, "OA buffer size invalid %llu\n", value);
		return -EINVAL;
	}
	param->oa_buffer_size = value;
	return 0;
}

static int xe_oa_set_prop_wait_num_reports(struct xe_oa *oa, u64 value,
					   struct xe_oa_open_param *param)
{
	if (!value) {
		drm_dbg(&oa->xe->drm, "wait_num_reports %llu\n", value);
		return -EINVAL;
	}
	param->wait_num_reports = value;
	return 0;
}

static int xe_oa_set_prop_ret_inval(struct xe_oa *oa, u64 value,
				    struct xe_oa_open_param *param)
{
	return -EINVAL;
}

typedef int (*xe_oa_set_property_fn)(struct xe_oa *oa, u64 value,
				     struct xe_oa_open_param *param);
static const xe_oa_set_property_fn xe_oa_set_property_funcs_open[] = {
	[DRM_XE_OA_PROPERTY_OA_UNIT_ID] = xe_oa_set_prop_oa_unit_id,
	[DRM_XE_OA_PROPERTY_SAMPLE_OA] = xe_oa_set_prop_sample_oa,
	[DRM_XE_OA_PROPERTY_OA_METRIC_SET] = xe_oa_set_prop_metric_set,
	[DRM_XE_OA_PROPERTY_OA_FORMAT] = xe_oa_set_prop_oa_format,
	[DRM_XE_OA_PROPERTY_OA_PERIOD_EXPONENT] = xe_oa_set_prop_oa_exponent,
	[DRM_XE_OA_PROPERTY_OA_DISABLED] = xe_oa_set_prop_disabled,
	[DRM_XE_OA_PROPERTY_EXEC_QUEUE_ID] = xe_oa_set_prop_exec_queue_id,
	[DRM_XE_OA_PROPERTY_OA_ENGINE_INSTANCE] = xe_oa_set_prop_engine_instance,
	[DRM_XE_OA_PROPERTY_NO_PREEMPT] = xe_oa_set_no_preempt,
	[DRM_XE_OA_PROPERTY_NUM_SYNCS] = xe_oa_set_prop_num_syncs,
	[DRM_XE_OA_PROPERTY_SYNCS] = xe_oa_set_prop_syncs_user,
	[DRM_XE_OA_PROPERTY_OA_BUFFER_SIZE] = xe_oa_set_prop_oa_buffer_size,
	[DRM_XE_OA_PROPERTY_WAIT_NUM_REPORTS] = xe_oa_set_prop_wait_num_reports,
};

static const xe_oa_set_property_fn xe_oa_set_property_funcs_config[] = {
	[DRM_XE_OA_PROPERTY_OA_UNIT_ID] = xe_oa_set_prop_ret_inval,
	[DRM_XE_OA_PROPERTY_SAMPLE_OA] = xe_oa_set_prop_ret_inval,
	[DRM_XE_OA_PROPERTY_OA_METRIC_SET] = xe_oa_set_prop_metric_set,
	[DRM_XE_OA_PROPERTY_OA_FORMAT] = xe_oa_set_prop_ret_inval,
	[DRM_XE_OA_PROPERTY_OA_PERIOD_EXPONENT] = xe_oa_set_prop_ret_inval,
	[DRM_XE_OA_PROPERTY_OA_DISABLED] = xe_oa_set_prop_ret_inval,
	[DRM_XE_OA_PROPERTY_EXEC_QUEUE_ID] = xe_oa_set_prop_ret_inval,
	[DRM_XE_OA_PROPERTY_OA_ENGINE_INSTANCE] = xe_oa_set_prop_ret_inval,
	[DRM_XE_OA_PROPERTY_NO_PREEMPT] = xe_oa_set_prop_ret_inval,
	[DRM_XE_OA_PROPERTY_NUM_SYNCS] = xe_oa_set_prop_num_syncs,
	[DRM_XE_OA_PROPERTY_SYNCS] = xe_oa_set_prop_syncs_user,
	[DRM_XE_OA_PROPERTY_OA_BUFFER_SIZE] = xe_oa_set_prop_ret_inval,
	[DRM_XE_OA_PROPERTY_WAIT_NUM_REPORTS] = xe_oa_set_prop_ret_inval,
};

static int xe_oa_user_ext_set_property(struct xe_oa *oa, enum xe_oa_user_extn_from from,
				       u64 extension, struct xe_oa_open_param *param)
{
	u64 __user *address = u64_to_user_ptr(extension);
	struct drm_xe_ext_set_property ext;
	int err;
	u32 idx;

	err = copy_from_user(&ext, address, sizeof(ext));
	if (XE_IOCTL_DBG(oa->xe, err))
		return -EFAULT;

	BUILD_BUG_ON(ARRAY_SIZE(xe_oa_set_property_funcs_open) !=
		     ARRAY_SIZE(xe_oa_set_property_funcs_config));

	if (XE_IOCTL_DBG(oa->xe, ext.property >= ARRAY_SIZE(xe_oa_set_property_funcs_open)) ||
	    XE_IOCTL_DBG(oa->xe, !ext.property) || XE_IOCTL_DBG(oa->xe, ext.pad))
		return -EINVAL;

	idx = array_index_nospec(ext.property, ARRAY_SIZE(xe_oa_set_property_funcs_open));

	if (from == XE_OA_USER_EXTN_FROM_CONFIG)
		return xe_oa_set_property_funcs_config[idx](oa, ext.value, param);
	else
		return xe_oa_set_property_funcs_open[idx](oa, ext.value, param);
}

typedef int (*xe_oa_user_extension_fn)(struct xe_oa *oa,  enum xe_oa_user_extn_from from,
				       u64 extension, struct xe_oa_open_param *param);
static const xe_oa_user_extension_fn xe_oa_user_extension_funcs[] = {
	[DRM_XE_OA_EXTENSION_SET_PROPERTY] = xe_oa_user_ext_set_property,
};

#define MAX_USER_EXTENSIONS	16
static int xe_oa_user_extensions(struct xe_oa *oa, enum xe_oa_user_extn_from from, u64 extension,
				 int ext_number, struct xe_oa_open_param *param)
{
	u64 __user *address = u64_to_user_ptr(extension);
	struct drm_xe_user_extension ext;
	int err;
	u32 idx;

	if (XE_IOCTL_DBG(oa->xe, ext_number >= MAX_USER_EXTENSIONS))
		return -E2BIG;

	err = copy_from_user(&ext, address, sizeof(ext));
	if (XE_IOCTL_DBG(oa->xe, err))
		return -EFAULT;

	if (XE_IOCTL_DBG(oa->xe, ext.pad) ||
	    XE_IOCTL_DBG(oa->xe, ext.name >= ARRAY_SIZE(xe_oa_user_extension_funcs)))
		return -EINVAL;

	idx = array_index_nospec(ext.name, ARRAY_SIZE(xe_oa_user_extension_funcs));
	err = xe_oa_user_extension_funcs[idx](oa, from, extension, param);
	if (XE_IOCTL_DBG(oa->xe, err))
		return err;

	if (ext.next_extension)
		return xe_oa_user_extensions(oa, from, ext.next_extension, ++ext_number, param);

	return 0;
}

static int xe_oa_parse_syncs(struct xe_oa *oa,
			     struct xe_oa_stream *stream,
			     struct xe_oa_open_param *param)
{
	int ret, num_syncs, num_ufence = 0;

	if (param->num_syncs && !param->syncs_user) {
		drm_dbg(&oa->xe->drm, "num_syncs specified without sync array\n");
		ret = -EINVAL;
		goto exit;
	}

	if (param->num_syncs) {
		param->syncs = kzalloc_objs(*param->syncs, param->num_syncs);
		if (!param->syncs) {
			ret = -ENOMEM;
			goto exit;
		}
	}

	for (num_syncs = 0; num_syncs < param->num_syncs; num_syncs++) {
		ret = xe_sync_entry_parse(oa->xe, param->xef, &param->syncs[num_syncs],
					  &param->syncs_user[num_syncs],
					  stream->ufence_syncobj,
					  ++stream->ufence_timeline_value, 0);
		if (ret)
			goto err_syncs;

		if (xe_sync_is_ufence(&param->syncs[num_syncs]))
			num_ufence++;
	}

	if (XE_IOCTL_DBG(oa->xe, num_ufence > 1)) {
		ret = -EINVAL;
		goto err_syncs;
	}

	return 0;

err_syncs:
	while (num_syncs--)
		xe_sync_entry_cleanup(&param->syncs[num_syncs]);
	kfree(param->syncs);
exit:
	return ret;
}

static void xe_oa_stream_enable(struct xe_oa_stream *stream)
{
	stream->pollin = false;

	xe_oa_enable(stream);

	if (stream->sample)
		hrtimer_start(&stream->poll_check_timer,
			      ns_to_ktime(stream->poll_period_ns),
			      HRTIMER_MODE_REL_PINNED);
}

static void xe_oa_stream_disable(struct xe_oa_stream *stream)
{
	xe_oa_disable(stream);

	if (stream->sample)
		hrtimer_cancel(&stream->poll_check_timer);

	/* Update stream->oa_buffer.tail to allow any final reports to be read */
	if (xe_oa_buffer_check_unlocked(stream))
		wake_up(&stream->poll_wq);
}

static int xe_oa_enable_preempt_timeslice(struct xe_oa_stream *stream)
{
	struct xe_exec_queue *q = stream->exec_q;
	int ret1, ret2;

	/* Best effort recovery: try to revert both to original, irrespective of error */
	ret1 = q->ops->set_timeslice(q, stream->hwe->eclass->sched_props.timeslice_us);
	ret2 = q->ops->set_preempt_timeout(q, stream->hwe->eclass->sched_props.preempt_timeout_us);
	if (ret1 || ret2)
		goto err;
	return 0;
err:
	drm_dbg(&stream->oa->xe->drm, "%s failed ret1 %d ret2 %d\n", __func__, ret1, ret2);
	return ret1 ?: ret2;
}

static int xe_oa_disable_preempt_timeslice(struct xe_oa_stream *stream)
{
	struct xe_exec_queue *q = stream->exec_q;
	int ret;

	/* Setting values to 0 will disable timeslice and preempt_timeout */
	ret = q->ops->set_timeslice(q, 0);
	if (ret)
		goto err;

	ret = q->ops->set_preempt_timeout(q, 0);
	if (ret)
		goto err;

	return 0;
err:
	xe_oa_enable_preempt_timeslice(stream);
	drm_dbg(&stream->oa->xe->drm, "%s failed %d\n", __func__, ret);
	return ret;
}

static int xe_oa_enable_locked(struct xe_oa_stream *stream)
{
	if (stream->enabled)
		return 0;

	if (stream->no_preempt) {
		int ret = xe_oa_disable_preempt_timeslice(stream);

		if (ret)
			return ret;
	}

	xe_oa_stream_enable(stream);

	stream->enabled = true;
	return 0;
}

static int xe_oa_disable_locked(struct xe_oa_stream *stream)
{
	int ret = 0;

	if (!stream->enabled)
		return 0;

	xe_oa_stream_disable(stream);

	if (stream->no_preempt)
		ret = xe_oa_enable_preempt_timeslice(stream);

	stream->enabled = false;
	return ret;
}

static long xe_oa_config_locked(struct xe_oa_stream *stream, u64 arg)
{
	struct xe_oa_open_param param = {};
	long ret = stream->oa_config->id;
	struct xe_oa_config *config;
	int err;

	err = xe_oa_user_extensions(stream->oa, XE_OA_USER_EXTN_FROM_CONFIG, arg, 0, &param);
	if (err)
		return err;

	config = xe_oa_get_oa_config(stream->oa, param.metric_set);
	if (!config)
		return -ENODEV;

	param.xef = stream->xef;
	err = xe_oa_parse_syncs(stream->oa, stream, &param);
	if (err)
		goto err_config_put;

	stream->num_syncs = param.num_syncs;
	stream->syncs = param.syncs;

	err = xe_oa_emit_oa_config(stream, config);
	if (!err) {
		config = xchg(&stream->oa_config, config);
		drm_dbg(&stream->oa->xe->drm, "changed to oa config uuid=%s\n",
			stream->oa_config->uuid);
	} else {
		while (param.num_syncs--)
			xe_sync_entry_cleanup(&param.syncs[param.num_syncs]);
		kfree(param.syncs);
	}

err_config_put:
	xe_oa_config_put(config);

	return err ?: ret;
}

static long xe_oa_status_locked(struct xe_oa_stream *stream, unsigned long arg)
{
	struct drm_xe_oa_stream_status status = {};
	void __user *uaddr = (void __user *)arg;

	/* Map from register to uapi bits */
	if (stream->oa_status & OASTATUS_REPORT_LOST)
		status.oa_status |= DRM_XE_OASTATUS_REPORT_LOST;
	if (stream->oa_status & OASTATUS_BUFFER_OVERFLOW)
		status.oa_status |= DRM_XE_OASTATUS_BUFFER_OVERFLOW;
	if (stream->oa_status & OASTATUS_COUNTER_OVERFLOW)
		status.oa_status |= DRM_XE_OASTATUS_COUNTER_OVERFLOW;
	if (stream->oa_status & OASTATUS_MMIO_TRG_Q_FULL)
		status.oa_status |= DRM_XE_OASTATUS_MMIO_TRG_Q_FULL;

	if (copy_to_user(uaddr, &status, sizeof(status)))
		return -EFAULT;

	return 0;
}

static long xe_oa_info_locked(struct xe_oa_stream *stream, unsigned long arg)
{
	struct drm_xe_oa_stream_info info = { .oa_buf_size = xe_bo_size(stream->oa_buffer.bo), };
	void __user *uaddr = (void __user *)arg;

	if (copy_to_user(uaddr, &info, sizeof(info)))
		return -EFAULT;

	return 0;
}

static long xe_oa_ioctl_locked(struct xe_oa_stream *stream,
			       unsigned int cmd,
			       unsigned long arg)
{
	switch (cmd) {
	case DRM_XE_OBSERVATION_IOCTL_ENABLE:
		return xe_oa_enable_locked(stream);
	case DRM_XE_OBSERVATION_IOCTL_DISABLE:
		return xe_oa_disable_locked(stream);
	case DRM_XE_OBSERVATION_IOCTL_CONFIG:
		return xe_oa_config_locked(stream, arg);
	case DRM_XE_OBSERVATION_IOCTL_STATUS:
		return xe_oa_status_locked(stream, arg);
	case DRM_XE_OBSERVATION_IOCTL_INFO:
		return xe_oa_info_locked(stream, arg);
	}

	return -EINVAL;
}

static long xe_oa_ioctl(struct file *file,
			unsigned int cmd,
			unsigned long arg)
{
	struct xe_oa_stream *stream = file->private_data;
	long ret;

	mutex_lock(&stream->stream_lock);
	ret = xe_oa_ioctl_locked(stream, cmd, arg);
	mutex_unlock(&stream->stream_lock);

	return ret;
}

static void xe_oa_destroy_locked(struct xe_oa_stream *stream)
{
	if (stream->enabled)
		xe_oa_disable_locked(stream);

	xe_oa_stream_destroy(stream);

	if (stream->exec_q)
		xe_exec_queue_put(stream->exec_q);

	drm_syncobj_put(stream->ufence_syncobj);
	kfree(stream);
}

static int xe_oa_release(struct inode *inode, struct file *file)
{
	struct xe_oa_stream *stream = file->private_data;
	struct xe_gt *gt = stream->gt;

	xe_pm_runtime_get(gt_to_xe(gt));
	mutex_lock(&gt->oa.gt_lock);
	xe_oa_destroy_locked(stream);
	mutex_unlock(&gt->oa.gt_lock);
	xe_pm_runtime_put(gt_to_xe(gt));

	/* Release the reference the OA stream kept on the driver */
	drm_dev_put(&gt_to_xe(gt)->drm);

	return 0;
}

static int xe_oa_mmap(struct file *file, struct vm_area_struct *vma)
{
	struct xe_oa_stream *stream = file->private_data;
	int ret = xe_observation_paranoid_check();
	struct xe_bo *bo = stream->oa_buffer.bo;

	if (ret) {
		drm_dbg(&stream->oa->xe->drm, "Insufficient privilege to map OA buffer\n");
		return ret;
	}

	/* Can mmap the entire OA buffer or nothing (no partial OA buffer mmaps) */
	if (vma->vm_end - vma->vm_start != xe_bo_size(bo)) {
		drm_dbg(&stream->oa->xe->drm, "Wrong mmap size, must be OA buffer size\n");
		return -EINVAL;
	}

	/*
	 * Only support VM_READ, enforce MAP_PRIVATE by checking for
	 * VM_MAYSHARE, don't copy the vma on fork
	 */
	if (vma->vm_flags & (VM_WRITE | VM_EXEC | VM_SHARED | VM_MAYSHARE)) {
		drm_dbg(&stream->oa->xe->drm, "mmap must be read only\n");
		return -EINVAL;
	}
	vm_flags_mod(vma, VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP | VM_DONTCOPY,
		     VM_MAYWRITE | VM_MAYEXEC);

	return drm_gem_mmap_obj(&bo->ttm.base, xe_bo_size(bo), vma);
}

static const struct file_operations xe_oa_fops = {
	.owner		= THIS_MODULE,
	.release	= xe_oa_release,
	.poll		= xe_oa_poll,
	.read		= xe_oa_read,
	.unlocked_ioctl	= xe_oa_ioctl,
	.mmap		= xe_oa_mmap,
};

static int xe_oa_stream_init(struct xe_oa_stream *stream,
			     struct xe_oa_open_param *param)
{
	struct xe_gt *gt = param->hwe->gt;
	int ret;

	stream->exec_q = param->exec_q;
	stream->poll_period_ns = DEFAULT_POLL_PERIOD_NS;
	stream->oa_unit = param->oa_unit;
	stream->hwe = param->hwe;
	stream->gt = stream->hwe->gt;
	stream->oa_buffer.format = &stream->oa->oa_formats[param->oa_format];

	stream->sample = param->sample;
	stream->periodic = param->period_exponent >= 0;
	stream->period_exponent = param->period_exponent;
	stream->no_preempt = param->no_preempt;
	stream->wait_num_reports = param->wait_num_reports;

	stream->xef = xe_file_get(param->xef);
	stream->num_syncs = param->num_syncs;
	stream->syncs = param->syncs;

	/*
	 * For Xe2+, when overrun mode is enabled, there are no partial reports at the end
	 * of buffer, making the OA buffer effectively a non-power-of-2 size circular
	 * buffer whose size, circ_size, is a multiple of the report size
	 */
	if (GRAPHICS_VER(stream->oa->xe) >= 20 &&
	    stream->oa_unit->type == DRM_XE_OA_UNIT_TYPE_OAG && stream->sample)
		stream->oa_buffer.circ_size =
			param->oa_buffer_size -
			param->oa_buffer_size % stream->oa_buffer.format->size;
	else
		stream->oa_buffer.circ_size = param->oa_buffer_size;

	stream->oa_config = xe_oa_get_oa_config(stream->oa, param->metric_set);
	if (!stream->oa_config) {
		drm_dbg(&stream->oa->xe->drm, "Invalid OA config id=%i\n", param->metric_set);
		ret = -EINVAL;
		goto exit;
	}

	/* Take runtime pm ref and forcewake to disable RC6 */
	xe_pm_runtime_get(stream->oa->xe);
	stream->fw_ref = xe_force_wake_get(gt_to_fw(gt), XE_FORCEWAKE_ALL);
	if (!xe_force_wake_ref_has_domain(stream->fw_ref, XE_FORCEWAKE_ALL)) {
		ret = -ETIMEDOUT;
		goto err_fw_put;
	}

	ret = xe_oa_alloc_oa_buffer(stream, param->oa_buffer_size);
	if (ret)
		goto err_fw_put;

	stream->k_exec_q = xe_exec_queue_create(stream->oa->xe, NULL,
						BIT(stream->hwe->logical_instance), 1,
						stream->hwe, EXEC_QUEUE_FLAG_KERNEL, 0);
	if (IS_ERR(stream->k_exec_q)) {
		ret = PTR_ERR(stream->k_exec_q);
		drm_err(&stream->oa->xe->drm, "gt%d, hwe %s, xe_exec_queue_create failed=%d",
			stream->gt->info.id, stream->hwe->name, ret);
		goto err_free_oa_buf;
	}

	ret = xe_oa_enable_metric_set(stream);
	if (ret) {
		drm_dbg(&stream->oa->xe->drm, "Unable to enable metric set\n");
		goto err_put_k_exec_q;
	}

	drm_dbg(&stream->oa->xe->drm, "opening stream oa config uuid=%s\n",
		stream->oa_config->uuid);

	WRITE_ONCE(stream->oa_unit->exclusive_stream, stream);

	hrtimer_setup(&stream->poll_check_timer, xe_oa_poll_check_timer_cb, CLOCK_MONOTONIC,
		      HRTIMER_MODE_REL);
	init_waitqueue_head(&stream->poll_wq);

	spin_lock_init(&stream->oa_buffer.ptr_lock);
	mutex_init(&stream->stream_lock);

	return 0;

err_put_k_exec_q:
	xe_oa_disable_metric_set(stream);
	xe_exec_queue_put(stream->k_exec_q);
err_free_oa_buf:
	xe_oa_free_oa_buffer(stream);
err_fw_put:
	xe_force_wake_put(gt_to_fw(gt), stream->fw_ref);
	xe_pm_runtime_put(stream->oa->xe);
	xe_oa_free_configs(stream);
exit:
	xe_file_put(stream->xef);
	return ret;
}

static int xe_oa_stream_open_ioctl_locked(struct xe_oa *oa,
					  struct xe_oa_open_param *param)
{
	struct xe_oa_stream *stream;
	struct drm_syncobj *ufence_syncobj;
	int stream_fd;
	int ret;

	/* We currently only allow exclusive access */
	if (param->oa_unit->exclusive_stream) {
		drm_dbg(&oa->xe->drm, "OA unit already in use\n");
		ret = -EBUSY;
		goto exit;
	}

	ret = drm_syncobj_create(&ufence_syncobj, DRM_SYNCOBJ_CREATE_SIGNALED,
				 NULL);
	if (ret)
		goto exit;

	stream = kzalloc_obj(*stream);
	if (!stream) {
		ret = -ENOMEM;
		goto err_syncobj;
	}
	stream->ufence_syncobj = ufence_syncobj;
	stream->oa = oa;

	ret = xe_oa_parse_syncs(oa, stream, param);
	if (ret)
		goto err_free;

	ret = xe_oa_stream_init(stream, param);
	if (ret) {
		while (param->num_syncs--)
			xe_sync_entry_cleanup(&param->syncs[param->num_syncs]);
		kfree(param->syncs);
		goto err_free;
	}

	if (!param->disabled) {
		ret = xe_oa_enable_locked(stream);
		if (ret)
			goto err_destroy;
	}

	stream_fd = anon_inode_getfd("[xe_oa]", &xe_oa_fops, stream, 0);
	if (stream_fd < 0) {
		ret = stream_fd;
		goto err_disable;
	}

	if (stream->sample)
		xe_reg_whitelist_oa_regs(stream->gt);

	/* Hold a reference on the drm device till stream_fd is released */
	drm_dev_get(&stream->oa->xe->drm);

	return stream_fd;
err_disable:
	if (!param->disabled)
		xe_oa_disable_locked(stream);
err_destroy:
	xe_oa_stream_destroy(stream);
err_free:
	kfree(stream);
err_syncobj:
	drm_syncobj_put(ufence_syncobj);
exit:
	return ret;
}

/**
 * xe_oa_timestamp_frequency - Return OA timestamp frequency
 * @gt: @xe_gt
 *
 * OA timestamp frequency = CS timestamp frequency in most platforms. On some
 * platforms OA unit ignores the CTC_SHIFT and the 2 timestamps differ. In such
 * cases, return the adjusted CS timestamp frequency to the user.
 */
u32 xe_oa_timestamp_frequency(struct xe_gt *gt)
{
	u32 reg, shift;

	if (XE_GT_WA(gt, 18013179988) || XE_GT_WA(gt, 14015568240)) {
		xe_pm_runtime_get(gt_to_xe(gt));
		reg = xe_mmio_read32(&gt->mmio, RPM_CONFIG0);
		xe_pm_runtime_put(gt_to_xe(gt));

		shift = REG_FIELD_GET(RPM_CONFIG0_CTC_SHIFT_PARAMETER_MASK, reg);
		return gt->info.reference_clock << (3 - shift);
	} else {
		return gt->info.reference_clock;
	}
}

static u64 oa_exponent_to_ns(struct xe_gt *gt, int exponent)
{
	u64 nom = (2ULL << exponent) * NSEC_PER_SEC;
	u32 den = xe_oa_timestamp_frequency(gt);

	return div_u64(nom + den - 1, den);
}

static bool oa_unit_supports_oa_format(struct xe_oa *oa, struct xe_oa_open_param *param)
{
	const struct xe_oa_format *f = &oa->oa_formats[param->oa_format];

	switch (param->oa_unit->type) {
	case DRM_XE_OA_UNIT_TYPE_OAG:
		return f->type == DRM_XE_OA_FMT_TYPE_OAG || f->type == DRM_XE_OA_FMT_TYPE_OAR ||
			f->type == DRM_XE_OA_FMT_TYPE_OAC || f->type == DRM_XE_OA_FMT_TYPE_PEC;
	case DRM_XE_OA_UNIT_TYPE_MERT:
		if (XE_DEVICE_WA(oa->xe, 14026746987))
			return param->oa_format == XE_OAM_FORMAT_MPEC8u32_B8_C8;
		fallthrough;
	case DRM_XE_OA_UNIT_TYPE_OAM:
	case DRM_XE_OA_UNIT_TYPE_OAM_SAG:
		return f->type == DRM_XE_OA_FMT_TYPE_OAM || f->type == DRM_XE_OA_FMT_TYPE_OAM_MPEC;
	default:
		return false;
	}
}

/**
 * xe_oa_unit_id - Return OA unit ID for a hardware engine
 * @hwe: @xe_hw_engine
 *
 * Return OA unit ID for a hardware engine when available
 */
u16 xe_oa_unit_id(struct xe_hw_engine *hwe)
{
	return hwe->oa_unit && hwe->oa_unit->num_engines ?
		hwe->oa_unit->oa_unit_id : U16_MAX;
}

/* A hwe must be assigned to stream/oa_unit for batch submissions */
static int xe_oa_assign_hwe(struct xe_oa *oa, struct xe_oa_open_param *param)
{
	struct xe_hw_engine *hwe;
	enum xe_hw_engine_id id;
	int ret = 0;

	/* When we have an exec_q, get hwe from the exec_q */
	if (param->exec_q) {
		param->hwe = xe_gt_hw_engine(param->exec_q->gt, param->exec_q->class,
					     param->engine_instance, true);
		if (!param->hwe || param->hwe->oa_unit != param->oa_unit)
			goto err;
		goto out;
	}

	/* Else just get the first hwe attached to the oa unit */
	for_each_hw_engine(hwe, param->oa_unit->gt, id) {
		if (hwe->oa_unit == param->oa_unit) {
			param->hwe = hwe;
			goto out;
		}
	}

	/* If we still didn't find a hwe, just get one with a valid oa_unit from the same gt */
	for_each_hw_engine(hwe, param->oa_unit->gt, id) {
		if (!hwe->oa_unit)
			continue;

		param->hwe = hwe;
		goto out;
	}
err:
	drm_dbg(&oa->xe->drm, "Unable to find hwe (%d, %d) for OA unit ID %d\n",
		param->exec_q ? param->exec_q->class : -1,
		param->engine_instance, param->oa_unit->oa_unit_id);
	ret = -EINVAL;
out:
	return ret;
}

/**
 * xe_oa_stream_open_ioctl - Opens an OA stream
 * @dev: @drm_device
 * @data: pointer to struct @drm_xe_oa_config
 * @file: @drm_file
 *
 * The functions opens an OA stream. An OA stream, opened with specified
 * properties, enables OA counter samples to be collected, either
 * periodically (time based sampling), or on request (using OA queries)
 */
int xe_oa_stream_open_ioctl(struct drm_device *dev, u64 data, struct drm_file *file)
{
	struct xe_device *xe = to_xe_device(dev);
	struct xe_oa *oa = &xe->oa;
	struct xe_file *xef = to_xe_file(file);
	struct xe_oa_open_param param = {};
	const struct xe_oa_format *f;
	bool privileged_op = true;
	int ret;

	if (!oa->xe) {
		drm_dbg(&xe->drm, "xe oa interface not available for this system\n");
		return -ENODEV;
	}

	param.xef = xef;
	param.period_exponent = -1;
	ret = xe_oa_user_extensions(oa, XE_OA_USER_EXTN_FROM_OPEN, data, 0, &param);
	if (ret)
		return ret;

	/* If not provided, OA unit defaults to OA unit 0 as per uapi */
	if (!param.oa_unit)
		param.oa_unit = &xe_root_mmio_gt(oa->xe)->oa.oa_unit[0];

	if (param.exec_queue_id > 0) {
		/* An exec_queue is only needed for OAR/OAC functionality on OAG */
		if (XE_IOCTL_DBG(oa->xe, param.oa_unit->type != DRM_XE_OA_UNIT_TYPE_OAG))
			return -EINVAL;

		param.exec_q = xe_exec_queue_lookup(xef, param.exec_queue_id);
		if (XE_IOCTL_DBG(oa->xe, !param.exec_q))
			return -ENOENT;

		if (XE_IOCTL_DBG(oa->xe, param.exec_q->width > 1)) {
			ret = -EOPNOTSUPP;
			goto err_exec_q;
		}
	}

	/*
	 * Query based sampling (using MI_REPORT_PERF_COUNT) with OAR/OAC,
	 * without global stream access, can be an unprivileged operation
	 */
	if (param.exec_q && !param.sample)
		privileged_op = false;

	if (param.no_preempt) {
		if (!param.exec_q) {
			drm_dbg(&oa->xe->drm, "Preemption disable without exec_q!\n");
			ret = -EINVAL;
			goto err_exec_q;
		}
		privileged_op = true;
	}

	if (privileged_op) {
		ret = xe_observation_paranoid_check();
		if (ret) {
			drm_dbg(&oa->xe->drm, "Insufficient privileges to open xe OA stream\n");
			goto err_exec_q;
		}
	}

	if (!param.exec_q && !param.sample) {
		drm_dbg(&oa->xe->drm, "Only OA report sampling supported\n");
		ret = -EINVAL;
		goto err_exec_q;
	}

	ret = xe_oa_assign_hwe(oa, &param);
	if (ret)
		goto err_exec_q;

	f = &oa->oa_formats[param.oa_format];
	if (!param.oa_format || !f->size || !oa_unit_supports_oa_format(oa, &param)) {
		drm_dbg(&oa->xe->drm, "Invalid OA format %d type %d size %d for class %d\n",
			param.oa_format, f->type, f->size, param.hwe->class);
		ret = -EINVAL;
		goto err_exec_q;
	}

	if (param.period_exponent >= 0) {
		u64 oa_period, oa_freq_hz;

		/* Requesting samples from OAG buffer is a privileged operation */
		if (!param.sample) {
			drm_dbg(&oa->xe->drm, "OA_EXPONENT specified without SAMPLE_OA\n");
			ret = -EINVAL;
			goto err_exec_q;
		}
		oa_period = oa_exponent_to_ns(param.hwe->gt, param.period_exponent);
		oa_freq_hz = div64_u64(NSEC_PER_SEC, oa_period);
		drm_dbg(&oa->xe->drm, "Using periodic sampling freq %lld Hz\n", oa_freq_hz);
	}

	if (!param.oa_buffer_size)
		param.oa_buffer_size = DEFAULT_XE_OA_BUFFER_SIZE;

	if (!param.wait_num_reports)
		param.wait_num_reports = 1;
	if (param.wait_num_reports > param.oa_buffer_size / f->size) {
		drm_dbg(&oa->xe->drm, "wait_num_reports %d\n", param.wait_num_reports);
		ret = -EINVAL;
		goto err_exec_q;
	}

	mutex_lock(&param.hwe->gt->oa.gt_lock);
	ret = xe_oa_stream_open_ioctl_locked(oa, &param);
	mutex_unlock(&param.hwe->gt->oa.gt_lock);
	if (ret < 0)
		goto err_exec_q;

	return ret;

err_exec_q:
	if (param.exec_q)
		xe_exec_queue_put(param.exec_q);
	return ret;
}

static bool xe_oa_is_valid_flex_addr(struct xe_oa *oa, u32 addr)
{
	static const struct xe_reg flex_eu_regs[] = {
		EU_PERF_CNTL0,
		EU_PERF_CNTL1,
		EU_PERF_CNTL2,
		EU_PERF_CNTL3,
		EU_PERF_CNTL4,
		EU_PERF_CNTL5,
		EU_PERF_CNTL6,
	};
	int i;

	for (i = 0; i < ARRAY_SIZE(flex_eu_regs); i++) {
		if (flex_eu_regs[i].addr == addr)
			return true;
	}
	return false;
}

static bool xe_oa_reg_in_range_table(u32 addr, const struct xe_mmio_range *table)
{
	while (table->start && table->end) {
		if (addr >= table->start && addr <= table->end)
			return true;

		table++;
	}

	return false;
}

static const struct xe_mmio_range xehp_oa_b_counters[] = {
	{ .start = 0xdc48, .end = 0xdc48 },	/* OAA_ENABLE_REG */
	{ .start = 0xdd00, .end = 0xdd48 },	/* OAG_LCE0_0 - OAA_LENABLE_REG */
	{}
};

static const struct xe_mmio_range gen12_oa_b_counters[] = {
	{ .start = 0x2b2c, .end = 0x2b2c },	/* OAG_OA_PESS */
	{ .start = 0xd900, .end = 0xd91c },	/* OAG_OASTARTTRIG[1-8] */
	{ .start = 0xd920, .end = 0xd93c },	/* OAG_OAREPORTTRIG1[1-8] */
	{ .start = 0xd940, .end = 0xd97c },	/* OAG_CEC[0-7][0-1] */
	{ .start = 0xdc00, .end = 0xdc3c },	/* OAG_SCEC[0-7][0-1] */
	{ .start = 0xdc40, .end = 0xdc40 },	/* OAG_SPCTR_CNF */
	{ .start = 0xdc44, .end = 0xdc44 },	/* OAA_DBG_REG */
	{}
};

static const struct xe_mmio_range mtl_oam_b_counters[] = {
	{ .start = 0x393000, .end = 0x39301c },	/* OAM_STARTTRIG1[1-8] */
	{ .start = 0x393020, .end = 0x39303c },	/* OAM_REPORTTRIG1[1-8] */
	{ .start = 0x393040, .end = 0x39307c },	/* OAM_CEC[0-7][0-1] */
	{ .start = 0x393200, .end = 0x39323C },	/* MPES[0-7] */
	{}
};

static const struct xe_mmio_range xe2_oa_b_counters[] = {
	{ .start = 0x393200, .end = 0x39323C },	/* MPES_0_MPES_SAG - MPES_7_UPPER_MPES_SAG */
	{ .start = 0x394200, .end = 0x39423C },	/* MPES_0_MPES_SCMI0 - MPES_7_UPPER_MPES_SCMI0 */
	{ .start = 0x394A00, .end = 0x394A3C },	/* MPES_0_MPES_SCMI1 - MPES_7_UPPER_MPES_SCMI1 */
	{},
};

static bool xe_oa_is_valid_b_counter_addr(struct xe_oa *oa, u32 addr)
{
	return xe_oa_reg_in_range_table(addr, xehp_oa_b_counters) ||
		xe_oa_reg_in_range_table(addr, gen12_oa_b_counters) ||
		xe_oa_reg_in_range_table(addr, mtl_oam_b_counters) ||
		(GRAPHICS_VER(oa->xe) >= 20 &&
		 xe_oa_reg_in_range_table(addr, xe2_oa_b_counters));
}

static const struct xe_mmio_range mtl_oa_mux_regs[] = {
	{ .start = 0x0d00, .end = 0x0d04 },	/* RPM_CONFIG[0-1] */
	{ .start = 0x0d0c, .end = 0x0d2c },	/* NOA_CONFIG[0-8] */
	{ .start = 0x9840, .end = 0x9840 },	/* GDT_CHICKEN_BITS */
	{ .start = 0x9884, .end = 0x9888 },	/* NOA_WRITE */
	{ .start = 0x38d100, .end = 0x38d114},	/* VISACTL */
	{}
};

static const struct xe_mmio_range gen12_oa_mux_regs[] = {
	{ .start = 0x0d00, .end = 0x0d04 },     /* RPM_CONFIG[0-1] */
	{ .start = 0x0d0c, .end = 0x0d2c },     /* NOA_CONFIG[0-8] */
	{ .start = 0x9840, .end = 0x9840 },	/* GDT_CHICKEN_BITS */
	{ .start = 0x9884, .end = 0x9888 },	/* NOA_WRITE */
	{ .start = 0x20cc, .end = 0x20cc },	/* WAIT_FOR_RC6_EXIT */
	{}
};

static const struct xe_mmio_range xe2_oa_mux_regs[] = {
	{ .start = 0x5194, .end = 0x5194 },	/* SYS_MEM_LAT_MEASURE_MERTF_GRP_3D */
	{ .start = 0x8704, .end = 0x8704 },	/* LMEM_LAT_MEASURE_MCFG_GRP */
	{ .start = 0xB01C, .end = 0xB01C },	/* LNCF_MISC_CONFIG_REGISTER0 */
	{ .start = 0xB1BC, .end = 0xB1BC },	/* L3_BANK_LAT_MEASURE_LBCF_GFX */
	{ .start = 0xD0E0, .end = 0xD0F4 },	/* VISACTL */
	{ .start = 0xE18C, .end = 0xE18C },	/* SAMPLER_MODE */
	{ .start = 0xE590, .end = 0xE590 },	/* TDL_LSC_LAT_MEASURE_TDL_GFX */
	{ .start = 0x13000, .end = 0x137FC },	/* PES_0_PESL0 - PES_63_UPPER_PESL3 */
	{ .start = 0x145194, .end = 0x145194 },	/* SYS_MEM_LAT_MEASURE */
	{ .start = 0x145340, .end = 0x14537C },	/* MERTSS_PES_0 - MERTSS_PES_7 */
	{},
};

static bool xe_oa_is_valid_mux_addr(struct xe_oa *oa, u32 addr)
{
	if (GRAPHICS_VER(oa->xe) >= 20)
		return xe_oa_reg_in_range_table(addr, xe2_oa_mux_regs);
	else if (GRAPHICS_VERx100(oa->xe) >= 1270)
		return xe_oa_reg_in_range_table(addr, mtl_oa_mux_regs);
	else
		return xe_oa_reg_in_range_table(addr, gen12_oa_mux_regs);
}

static bool xe_oa_is_valid_config_reg(struct xe_oa *oa, u32 addr, u32 val)
{
	if (XE_DEVICE_WA(oa->xe, 14026779378) &&
	    addr == SYS_MEM_LAT_MEASURE.addr && val & SYS_MEM_LAT_MEASURE_EN)
		return false;

	return xe_oa_is_valid_flex_addr(oa, addr) ||
		xe_oa_is_valid_b_counter_addr(oa, addr) ||
		xe_oa_is_valid_mux_addr(oa, addr);
}

static struct xe_oa_reg *
xe_oa_alloc_regs(struct xe_oa *oa, bool (*is_valid)(struct xe_oa *oa, u32 addr, u32 val),
		 u32 __user *regs, u32 n_regs)
{
	struct xe_oa_reg *oa_regs;
	int err;
	u32 i;

	oa_regs = kmalloc_objs(*oa_regs, n_regs);
	if (!oa_regs)
		return ERR_PTR(-ENOMEM);

	for (i = 0; i < n_regs; i++) {
		u32 addr, value;

		err = get_user(addr, regs);
		if (err)
			goto addr_err;

		err = get_user(value, regs + 1);
		if (err)
			goto addr_err;

		if (!is_valid(oa, addr, value)) {
			drm_dbg(&oa->xe->drm, "Invalid oa_reg addr/value: %#x %#x\n", addr, value);
			err = -EINVAL;
			goto addr_err;
		}

		oa_regs[i].addr = XE_REG(addr);
		oa_regs[i].value = value;

		regs += 2;
	}

	return oa_regs;

addr_err:
	kfree(oa_regs);
	return ERR_PTR(err);
}
ALLOW_ERROR_INJECTION(xe_oa_alloc_regs, ERRNO);

static ssize_t show_dynamic_id(struct kobject *kobj,
			       struct kobj_attribute *attr,
			       char *buf)
{
	struct xe_oa_config *oa_config =
		container_of(attr, typeof(*oa_config), sysfs_metric_id);

	return sysfs_emit(buf, "%d\n", oa_config->id);
}

static int create_dynamic_oa_sysfs_entry(struct xe_oa *oa,
					 struct xe_oa_config *oa_config)
{
	sysfs_attr_init(&oa_config->sysfs_metric_id.attr);
	oa_config->sysfs_metric_id.attr.name = "id";
	oa_config->sysfs_metric_id.attr.mode = 0444;
	oa_config->sysfs_metric_id.show = show_dynamic_id;
	oa_config->sysfs_metric_id.store = NULL;

	oa_config->attrs[0] = &oa_config->sysfs_metric_id.attr;
	oa_config->attrs[1] = NULL;

	oa_config->sysfs_metric.name = oa_config->uuid;
	oa_config->sysfs_metric.attrs = oa_config->attrs;

	return sysfs_create_group(oa->metrics_kobj, &oa_config->sysfs_metric);
}

/**
 * xe_oa_add_config_ioctl - Adds one OA config
 * @dev: @drm_device
 * @data: pointer to struct @drm_xe_oa_config
 * @file: @drm_file
 *
 * The functions adds an OA config to the set of OA configs maintained in
 * the kernel. The config determines which OA metrics are collected for an
 * OA stream.
 */
int xe_oa_add_config_ioctl(struct drm_device *dev, u64 data, struct drm_file *file)
{
	struct xe_device *xe = to_xe_device(dev);
	struct xe_oa *oa = &xe->oa;
	struct drm_xe_oa_config param;
	struct drm_xe_oa_config *arg = &param;
	struct xe_oa_config *oa_config, *tmp;
	struct xe_oa_reg *regs;
	int err, id;

	if (!oa->xe) {
		drm_dbg(&xe->drm, "xe oa interface not available for this system\n");
		return -ENODEV;
	}

	err = xe_observation_paranoid_check();
	if (err) {
		drm_dbg(&oa->xe->drm, "Insufficient privileges to add xe OA config\n");
		return err;
	}

	err = copy_from_user(&param, u64_to_user_ptr(data), sizeof(param));
	if (XE_IOCTL_DBG(oa->xe, err))
		return -EFAULT;

	if (XE_IOCTL_DBG(oa->xe, arg->extensions) ||
	    XE_IOCTL_DBG(oa->xe, !arg->regs_ptr) ||
	    XE_IOCTL_DBG(oa->xe, !arg->n_regs))
		return -EINVAL;

	oa_config = kzalloc_obj(*oa_config);
	if (!oa_config)
		return -ENOMEM;

	oa_config->oa = oa;
	kref_init(&oa_config->ref);

	if (!uuid_is_valid(arg->uuid)) {
		drm_dbg(&oa->xe->drm, "Invalid uuid format for OA config\n");
		err = -EINVAL;
		goto reg_err;
	}

	/* Last character in oa_config->uuid will be 0 because oa_config is kzalloc */
	memcpy(oa_config->uuid, arg->uuid, sizeof(arg->uuid));

	oa_config->regs_len = arg->n_regs;
	regs = xe_oa_alloc_regs(oa, xe_oa_is_valid_config_reg,
				u64_to_user_ptr(arg->regs_ptr),
				arg->n_regs);
	if (IS_ERR(regs)) {
		drm_dbg(&oa->xe->drm, "Failed to create OA config for mux_regs\n");
		err = PTR_ERR(regs);
		goto reg_err;
	}
	oa_config->regs = regs;

	err = mutex_lock_interruptible(&oa->metrics_lock);
	if (err)
		goto reg_err;

	/* We shouldn't have too many configs, so this iteration shouldn't be too costly */
	idr_for_each_entry(&oa->metrics_idr, tmp, id) {
		if (!strcmp(tmp->uuid, oa_config->uuid)) {
			drm_dbg(&oa->xe->drm, "OA config already exists with this uuid\n");
			err = -EADDRINUSE;
			goto sysfs_err;
		}
	}

	err = create_dynamic_oa_sysfs_entry(oa, oa_config);
	if (err) {
		drm_dbg(&oa->xe->drm, "Failed to create sysfs entry for OA config\n");
		goto sysfs_err;
	}

	oa_config->id = idr_alloc(&oa->metrics_idr, oa_config, 1, 0, GFP_KERNEL);
	if (oa_config->id < 0) {
		drm_dbg(&oa->xe->drm, "Failed to allocate id for OA config\n");
		err = oa_config->id;
		goto id_alloc_err;
	}

	id = oa_config->id;

	drm_dbg(&oa->xe->drm, "Added config %s id=%i\n", oa_config->uuid, id);

	mutex_unlock(&oa->metrics_lock);

	return id;

id_alloc_err:
	sysfs_remove_group(oa->metrics_kobj, &oa_config->sysfs_metric);
sysfs_err:
	mutex_unlock(&oa->metrics_lock);
reg_err:
	xe_oa_config_put(oa_config);
	drm_dbg(&oa->xe->drm, "Failed to add new OA config\n");
	return err;
}

/**
 * xe_oa_remove_config_ioctl - Removes one OA config
 * @dev: @drm_device
 * @data: pointer to struct @drm_xe_observation_param
 * @file: @drm_file
 */
int xe_oa_remove_config_ioctl(struct drm_device *dev, u64 data, struct drm_file *file)
{
	struct xe_device *xe = to_xe_device(dev);
	struct xe_oa *oa = &xe->oa;
	struct xe_oa_config *oa_config;
	u64 arg, *ptr = u64_to_user_ptr(data);
	int ret;

	if (!oa->xe) {
		drm_dbg(&xe->drm, "xe oa interface not available for this system\n");
		return -ENODEV;
	}

	ret = xe_observation_paranoid_check();
	if (ret) {
		drm_dbg(&oa->xe->drm, "Insufficient privileges to remove xe OA config\n");
		return ret;
	}

	ret = get_user(arg, ptr);
	if (XE_IOCTL_DBG(oa->xe, ret))
		return ret;

	ret = mutex_lock_interruptible(&oa->metrics_lock);
	if (ret)
		return ret;

	oa_config = idr_find(&oa->metrics_idr, arg);
	if (!oa_config) {
		drm_dbg(&oa->xe->drm, "Failed to remove unknown OA config\n");
		ret = -ENOENT;
		goto err_unlock;
	}

	WARN_ON(arg != oa_config->id);

	sysfs_remove_group(oa->metrics_kobj, &oa_config->sysfs_metric);
	idr_remove(&oa->metrics_idr, arg);

	mutex_unlock(&oa->metrics_lock);

	drm_dbg(&oa->xe->drm, "Removed config %s id=%i\n", oa_config->uuid, oa_config->id);

	xe_oa_config_put(oa_config);

	return 0;

err_unlock:
	mutex_unlock(&oa->metrics_lock);
	return ret;
}

static void xe_oa_unregister(void *arg)
{
	struct xe_oa *oa = arg;

	if (!oa->metrics_kobj)
		return;

	kobject_put(oa->metrics_kobj);
	oa->metrics_kobj = NULL;
}

/**
 * xe_oa_register - Xe OA registration
 * @xe: @xe_device
 *
 * Exposes the metrics sysfs directory upon completion of module initialization
 */
int xe_oa_register(struct xe_device *xe)
{
	struct xe_oa *oa = &xe->oa;

	if (!oa->xe)
		return 0;

	oa->metrics_kobj = kobject_create_and_add("metrics",
						  &xe->drm.primary->kdev->kobj);
	if (!oa->metrics_kobj)
		return -ENOMEM;

	return devm_add_action_or_reset(xe->drm.dev, xe_oa_unregister, oa);
}

static u32 num_oa_units_per_gt(struct xe_gt *gt)
{
	if (xe_gt_is_main_type(gt) || GRAPHICS_VER(gt_to_xe(gt)) < 20)
		/*
		 * Mert OA unit belongs to the SoC, not a gt, so should be accessed using
		 * xe_root_tile_mmio(). However, for all known platforms this is the same as
		 * accessing via xe_root_mmio_gt()->mmio.
		 */
		return xe_device_has_mert(gt_to_xe(gt)) ? 2 : 1;
	else if (!IS_DGFX(gt_to_xe(gt)))
		return XE_OAM_UNIT_SCMI_0 + 1; /* SAG + SCMI_0 */
	else
		return XE_OAM_UNIT_SCMI_1 + 1; /* SAG + SCMI_0 + SCMI_1 */
}

static u32 __hwe_oam_unit(struct xe_hw_engine *hwe)
{
	if (GRAPHICS_VERx100(gt_to_xe(hwe->gt)) < 1270)
		return XE_OA_UNIT_INVALID;

	xe_gt_WARN_ON(hwe->gt, xe_gt_is_main_type(hwe->gt));

	if (GRAPHICS_VER(gt_to_xe(hwe->gt)) < 20)
		return 0;
	/*
	 * XE_OAM_UNIT_SAG has only GSCCS attached to it, but only on some platforms. Also
	 * GSCCS cannot be used to submit batches to program the OAM unit. Therefore we don't
	 * assign an OA unit to GSCCS. This means that XE_OAM_UNIT_SAG is exposed as an OA
	 * unit without attached engines. Fused off engines can also result in oa_unit's with
	 * num_engines == 0. OA streams can be opened on all OA units.
	 */
	else if (hwe->engine_id == XE_HW_ENGINE_GSCCS0)
		return XE_OA_UNIT_INVALID;
	else if (!IS_DGFX(gt_to_xe(hwe->gt)))
		return XE_OAM_UNIT_SCMI_0;
	else if (hwe->class == XE_ENGINE_CLASS_VIDEO_DECODE)
		return (hwe->instance / 2 & 0x1) + 1;
	else if (hwe->class == XE_ENGINE_CLASS_VIDEO_ENHANCE)
		return (hwe->instance & 0x1) + 1;

	return XE_OA_UNIT_INVALID;
}

static u32 __hwe_oa_unit(struct xe_hw_engine *hwe)
{
	switch (hwe->class) {
	case XE_ENGINE_CLASS_RENDER:
	case XE_ENGINE_CLASS_COMPUTE:
		return 0;

	case XE_ENGINE_CLASS_VIDEO_DECODE:
	case XE_ENGINE_CLASS_VIDEO_ENHANCE:
	case XE_ENGINE_CLASS_OTHER:
		return __hwe_oam_unit(hwe);

	default:
		return XE_OA_UNIT_INVALID;
	}
}

static struct xe_oa_regs __oam_regs(u32 base)
{
	return (struct xe_oa_regs) {
		.base		= base,
		.oa_head_ptr	= OAM_HEAD_POINTER(base),
		.oa_tail_ptr	= OAM_TAIL_POINTER(base),
		.oa_buffer	= OAM_BUFFER(base),
		.oa_ctx_ctrl	= OAM_CONTEXT_CONTROL(base),
		.oa_ctrl	= OAM_CONTROL(base),
		.oa_debug	= OAM_DEBUG(base),
		.oa_status	= OAM_STATUS(base),
		.oa_mmio_trg	= OAM_MMIO_TRG(base),
		.oa_ctrl_counter_select_mask = OAM_CONTROL_COUNTER_SEL_MASK,
	};
}

static struct xe_oa_regs __oag_regs(void)
{
	return (struct xe_oa_regs) {
		.base		= 0,
		.oa_head_ptr	= OAG_OAHEADPTR,
		.oa_tail_ptr	= OAG_OATAILPTR,
		.oa_buffer	= OAG_OABUFFER,
		.oa_ctx_ctrl	= OAG_OAGLBCTXCTRL,
		.oa_ctrl	= OAG_OACONTROL,
		.oa_debug	= OAG_OA_DEBUG,
		.oa_status	= OAG_OASTATUS,
		.oa_mmio_trg	= OAG_MMIOTRIGGER,
		.oa_ctrl_counter_select_mask = OAG_OACONTROL_OA_COUNTER_SEL_MASK,
	};
}

static struct xe_oa_regs __oamert_regs(void)
{
	return (struct xe_oa_regs) {
		.base		= 0,
		.oa_head_ptr	= OAMERT_HEAD_POINTER,
		.oa_tail_ptr	= OAMERT_TAIL_POINTER,
		.oa_buffer	= OAMERT_BUFFER,
		.oa_ctx_ctrl	= OAMERT_CONTEXT_CONTROL,
		.oa_ctrl	= OAMERT_CONTROL,
		.oa_debug	= OAMERT_DEBUG,
		.oa_status	= OAMERT_STATUS,
		.oa_mmio_trg	= OAMERT_MMIO_TRG,
		.oa_ctrl_counter_select_mask = OAM_CONTROL_COUNTER_SEL_MASK,
	};
}

static void __xe_oa_init_oa_units(struct xe_gt *gt)
{
	const u32 oam_base_addr[] = {
		[XE_OAM_UNIT_SAG]    = XE_OAM_SAG_BASE,
		[XE_OAM_UNIT_SCMI_0] = XE_OAM_SCMI_0_BASE,
		[XE_OAM_UNIT_SCMI_1] = XE_OAM_SCMI_1_BASE,
	};
	int i, num_units = gt->oa.num_oa_units;

	for (i = 0; i < num_units; i++) {
		struct xe_oa_unit *u = &gt->oa.oa_unit[i];

		if (xe_gt_is_main_type(gt)) {
			if (!i) {
				u->regs = __oag_regs();
				u->type = DRM_XE_OA_UNIT_TYPE_OAG;
			} else {
				xe_gt_assert(gt, xe_device_has_mert(gt_to_xe(gt)));
				xe_gt_assert(gt, gt == xe_root_mmio_gt(gt_to_xe(gt)));
				u->regs = __oamert_regs();
				u->type = DRM_XE_OA_UNIT_TYPE_MERT;
			}
		} else {
			xe_gt_assert(gt, GRAPHICS_VERx100(gt_to_xe(gt)) >= 1270);
			u->regs = __oam_regs(oam_base_addr[i]);
			u->type = i == XE_OAM_UNIT_SAG && GRAPHICS_VER(gt_to_xe(gt)) >= 20 ?
				DRM_XE_OA_UNIT_TYPE_OAM_SAG : DRM_XE_OA_UNIT_TYPE_OAM;
		}

		u->gt = gt;

		xe_mmio_write32(&gt->mmio, u->regs.oa_ctrl, 0);

		/* Ensure MMIO trigger remains disabled till there is a stream */
		xe_mmio_write32(&gt->mmio, u->regs.oa_debug,
				oag_configure_mmio_trigger(NULL, false));

		/* Set oa_unit_ids now to ensure ids remain contiguous */
		u->oa_unit_id = gt_to_xe(gt)->oa.oa_unit_ids++;
	}
}

static int xe_oa_init_gt(struct xe_gt *gt)
{
	u32 num_oa_units = num_oa_units_per_gt(gt);
	struct xe_hw_engine *hwe;
	enum xe_hw_engine_id id;
	struct xe_oa_unit *u;

	u = drmm_kcalloc(&gt_to_xe(gt)->drm, num_oa_units, sizeof(*u), GFP_KERNEL);
	if (!u)
		return -ENOMEM;

	for_each_hw_engine(hwe, gt, id) {
		u32 index = __hwe_oa_unit(hwe);

		hwe->oa_unit = NULL;
		if (index < num_oa_units) {
			u[index].num_engines++;
			hwe->oa_unit = &u[index];
		}
	}

	gt->oa.num_oa_units = num_oa_units;
	gt->oa.oa_unit = u;

	__xe_oa_init_oa_units(gt);

	return drmm_mutex_init(&gt_to_xe(gt)->drm, &gt->oa.gt_lock);
}

static void xe_oa_print_gt_oa_units(struct xe_gt *gt)
{
	enum xe_hw_engine_id hwe_id;
	struct xe_hw_engine *hwe;
	struct xe_oa_unit *u;
	char buf[256];
	int i, n;

	for (i = 0; i < gt->oa.num_oa_units; i++) {
		u = &gt->oa.oa_unit[i];
		buf[0] = '\0';
		n = 0;

		for_each_hw_engine(hwe, gt, hwe_id)
			if (xe_oa_unit_id(hwe) == u->oa_unit_id)
				n += scnprintf(buf + n, sizeof(buf) - n, "%s ", hwe->name);

		xe_gt_dbg(gt, "oa_unit %d, type %d, Engines: %s\n", u->oa_unit_id, u->type, buf);
	}
}

static void xe_oa_print_oa_units(struct xe_oa *oa)
{
	struct xe_gt *gt;
	int gt_id;

	for_each_gt(gt, oa->xe, gt_id)
		xe_oa_print_gt_oa_units(gt);
}

static int xe_oa_init_oa_units(struct xe_oa *oa)
{
	struct xe_gt *gt;
	int i, ret;

	/* Needed for OAM implementation here */
	BUILD_BUG_ON(XE_OAM_UNIT_SAG != 0);
	BUILD_BUG_ON(XE_OAM_UNIT_SCMI_0 != 1);
	BUILD_BUG_ON(XE_OAM_UNIT_SCMI_1 != 2);

	for_each_gt(gt, oa->xe, i) {
		ret = xe_oa_init_gt(gt);
		if (ret)
			return ret;
	}

	xe_oa_print_oa_units(oa);

	return 0;
}

static void oa_format_add(struct xe_oa *oa, enum xe_oa_format_name format)
{
	__set_bit(format, oa->format_mask);
}

static void xe_oa_init_supported_formats(struct xe_oa *oa)
{
	if (GRAPHICS_VER(oa->xe) >= 20) {
		/* Xe2+ */
		oa_format_add(oa, XE_OAM_FORMAT_MPEC8u64_B8_C8);
		oa_format_add(oa, XE_OAM_FORMAT_MPEC8u32_B8_C8);
		oa_format_add(oa, XE_OA_FORMAT_PEC64u64);
		oa_format_add(oa, XE_OA_FORMAT_PEC64u64_B8_C8);
		oa_format_add(oa, XE_OA_FORMAT_PEC64u32);
		oa_format_add(oa, XE_OA_FORMAT_PEC32u64_G1);
		oa_format_add(oa, XE_OA_FORMAT_PEC32u32_G1);
		oa_format_add(oa, XE_OA_FORMAT_PEC32u64_G2);
		oa_format_add(oa, XE_OA_FORMAT_PEC32u32_G2);
		oa_format_add(oa, XE_OA_FORMAT_PEC36u64_G1_32_G2_4);
		oa_format_add(oa, XE_OA_FORMAT_PEC36u64_G1_4_G2_32);
	} else if (GRAPHICS_VERx100(oa->xe) >= 1270) {
		/* XE_METEORLAKE */
		oa_format_add(oa, XE_OAR_FORMAT_A32u40_A4u32_B8_C8);
		oa_format_add(oa, XE_OA_FORMAT_A24u40_A14u32_B8_C8);
		oa_format_add(oa, XE_OAC_FORMAT_A24u64_B8_C8);
		oa_format_add(oa, XE_OAC_FORMAT_A22u32_R2u32_B8_C8);
		oa_format_add(oa, XE_OAM_FORMAT_MPEC8u64_B8_C8);
		oa_format_add(oa, XE_OAM_FORMAT_MPEC8u32_B8_C8);
	} else if (GRAPHICS_VERx100(oa->xe) >= 1255) {
		/* XE_DG2, XE_PVC */
		oa_format_add(oa, XE_OAR_FORMAT_A32u40_A4u32_B8_C8);
		oa_format_add(oa, XE_OA_FORMAT_A24u40_A14u32_B8_C8);
		oa_format_add(oa, XE_OAC_FORMAT_A24u64_B8_C8);
		oa_format_add(oa, XE_OAC_FORMAT_A22u32_R2u32_B8_C8);
	} else {
		/* Gen12+ */
		xe_assert(oa->xe, GRAPHICS_VER(oa->xe) >= 12);
		oa_format_add(oa, XE_OA_FORMAT_A12);
		oa_format_add(oa, XE_OA_FORMAT_A12_B8_C8);
		oa_format_add(oa, XE_OA_FORMAT_A32u40_A4u32_B8_C8);
		oa_format_add(oa, XE_OA_FORMAT_C4_B8);
	}
}

static int destroy_config(int id, void *p, void *data)
{
	xe_oa_config_put(p);

	return 0;
}

static void xe_oa_fini(void *arg)
{
	struct xe_device *xe = arg;
	struct xe_oa *oa = &xe->oa;

	if (!oa->xe)
		return;

	idr_for_each(&oa->metrics_idr, destroy_config, oa);
	idr_destroy(&oa->metrics_idr);

	oa->xe = NULL;
}

/**
 * xe_oa_init - OA initialization during device probe
 * @xe: @xe_device
 *
 * Return: 0 on success or a negative error code on failure
 */
int xe_oa_init(struct xe_device *xe)
{
	struct xe_oa *oa = &xe->oa;
	int ret;

	/* Support OA only with GuC submission and Gen12+ */
	if (!xe_device_uc_enabled(xe) || GRAPHICS_VER(xe) < 12)
		return 0;

	if (IS_SRIOV_VF(xe))
		return 0;

	oa->xe = xe;
	oa->oa_formats = oa_formats;

	ret = drmm_mutex_init(&oa->xe->drm, &oa->metrics_lock);
	if (ret)
		goto exit;

	idr_init_base(&oa->metrics_idr, 1);

	ret = xe_oa_init_oa_units(oa);
	if (ret) {
		drm_err(&xe->drm, "OA initialization failed (%pe)\n", ERR_PTR(ret));
		goto exit;
	}

	xe_oa_init_supported_formats(oa);

	return devm_add_action_or_reset(xe->drm.dev, xe_oa_fini, xe);

exit:
	oa->xe = NULL;
	return ret;
}