/*
 * Copyright(c) 2011-2016 Intel Corporation. All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * 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 NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * Authors:
 *    Eddie Dong <eddie.dong@intel.com>
 *    Kevin Tian <kevin.tian@intel.com>
 *
 * Contributors:
 *    Zhi Wang <zhi.a.wang@intel.com>
 *    Changbin Du <changbin.du@intel.com>
 *    Zhenyu Wang <zhenyuw@linux.intel.com>
 *    Tina Zhang <tina.zhang@intel.com>
 *    Bing Niu <bing.niu@intel.com>
 *
 */

#include "i915_drv.h"
#include "gvt.h"
#include "trace.h"

struct render_mmio {
	int ring_id;
	i915_reg_t reg;
	u32 mask;
	bool in_context;
	u32 value;
};

static struct render_mmio gen8_render_mmio_list[] __cacheline_aligned = {
	{RCS, _MMIO(0x229c), 0xffff, false},
	{RCS, _MMIO(0x2248), 0x0, false},
	{RCS, _MMIO(0x2098), 0x0, false},
	{RCS, _MMIO(0x20c0), 0xffff, true},
	{RCS, _MMIO(0x24d0), 0, false},
	{RCS, _MMIO(0x24d4), 0, false},
	{RCS, _MMIO(0x24d8), 0, false},
	{RCS, _MMIO(0x24dc), 0, false},
	{RCS, _MMIO(0x24e0), 0, false},
	{RCS, _MMIO(0x24e4), 0, false},
	{RCS, _MMIO(0x24e8), 0, false},
	{RCS, _MMIO(0x24ec), 0, false},
	{RCS, _MMIO(0x24f0), 0, false},
	{RCS, _MMIO(0x24f4), 0, false},
	{RCS, _MMIO(0x24f8), 0, false},
	{RCS, _MMIO(0x24fc), 0, false},
	{RCS, _MMIO(0x7004), 0xffff, true},
	{RCS, _MMIO(0x7008), 0xffff, true},
	{RCS, _MMIO(0x7000), 0xffff, true},
	{RCS, _MMIO(0x7010), 0xffff, true},
	{RCS, _MMIO(0x7300), 0xffff, true},
	{RCS, _MMIO(0x83a4), 0xffff, true},

	{BCS, _MMIO(0x2229c), 0xffff, false},
	{BCS, _MMIO(0x2209c), 0xffff, false},
	{BCS, _MMIO(0x220c0), 0xffff, false},
	{BCS, _MMIO(0x22098), 0x0, false},
	{BCS, _MMIO(0x22028), 0x0, false},
};

static struct render_mmio gen9_render_mmio_list[] __cacheline_aligned = {
	{RCS, _MMIO(0x229c), 0xffff, false},
	{RCS, _MMIO(0x2248), 0x0, false},
	{RCS, _MMIO(0x2098), 0x0, false},
	{RCS, _MMIO(0x20c0), 0xffff, true},
	{RCS, _MMIO(0x24d0), 0, false},
	{RCS, _MMIO(0x24d4), 0, false},
	{RCS, _MMIO(0x24d8), 0, false},
	{RCS, _MMIO(0x24dc), 0, false},
	{RCS, _MMIO(0x24e0), 0, false},
	{RCS, _MMIO(0x24e4), 0, false},
	{RCS, _MMIO(0x24e8), 0, false},
	{RCS, _MMIO(0x24ec), 0, false},
	{RCS, _MMIO(0x24f0), 0, false},
	{RCS, _MMIO(0x24f4), 0, false},
	{RCS, _MMIO(0x24f8), 0, false},
	{RCS, _MMIO(0x24fc), 0, false},
	{RCS, _MMIO(0x7004), 0xffff, true},
	{RCS, _MMIO(0x7008), 0xffff, true},
	{RCS, _MMIO(0x7000), 0xffff, true},
	{RCS, _MMIO(0x7010), 0xffff, true},
	{RCS, _MMIO(0x7300), 0xffff, true},
	{RCS, _MMIO(0x83a4), 0xffff, true},

	{RCS, _MMIO(0x40e0), 0, false},
	{RCS, _MMIO(0x40e4), 0, false},
	{RCS, _MMIO(0x2580), 0xffff, true},
	{RCS, _MMIO(0x7014), 0xffff, true},
	{RCS, _MMIO(0x20ec), 0xffff, false},
	{RCS, _MMIO(0xb118), 0, false},
	{RCS, _MMIO(0xe100), 0xffff, true},
	{RCS, _MMIO(0xe180), 0xffff, true},
	{RCS, _MMIO(0xe184), 0xffff, true},
	{RCS, _MMIO(0xe188), 0xffff, true},
	{RCS, _MMIO(0xe194), 0xffff, true},
	{RCS, _MMIO(0x4de0), 0, false},
	{RCS, _MMIO(0x4de4), 0, false},
	{RCS, _MMIO(0x4de8), 0, false},
	{RCS, _MMIO(0x4dec), 0, false},
	{RCS, _MMIO(0x4df0), 0, false},
	{RCS, _MMIO(0x4df4), 0, false},

	{BCS, _MMIO(0x2229c), 0xffff, false},
	{BCS, _MMIO(0x2209c), 0xffff, false},
	{BCS, _MMIO(0x220c0), 0xffff, false},
	{BCS, _MMIO(0x22098), 0x0, false},
	{BCS, _MMIO(0x22028), 0x0, false},

	{VCS2, _MMIO(0x1c028), 0xffff, false},

	{VECS, _MMIO(0x1a028), 0xffff, false},

	{RCS, _MMIO(0x7304), 0xffff, true},
	{RCS, _MMIO(0x2248), 0x0, false},
	{RCS, _MMIO(0x940c), 0x0, false},
	{RCS, _MMIO(0x4ab8), 0x0, false},

	{RCS, _MMIO(0x4ab0), 0x0, false},
	{RCS, _MMIO(0x20d4), 0x0, false},

	{RCS, _MMIO(0xb004), 0x0, false},
	{RCS, _MMIO(0x20a0), 0x0, false},
	{RCS, _MMIO(0x20e4), 0xffff, false},
};

static u32 gen9_render_mocs[I915_NUM_ENGINES][64];
static u32 gen9_render_mocs_L3[32];

static void handle_tlb_pending_event(struct intel_vgpu *vgpu, int ring_id)
{
	struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
	enum forcewake_domains fw;
	i915_reg_t reg;
	u32 regs[] = {
		[RCS] = 0x4260,
		[VCS] = 0x4264,
		[VCS2] = 0x4268,
		[BCS] = 0x426c,
		[VECS] = 0x4270,
	};

	if (WARN_ON(ring_id >= ARRAY_SIZE(regs)))
		return;

	if (!test_and_clear_bit(ring_id, (void *)vgpu->tlb_handle_pending))
		return;

	reg = _MMIO(regs[ring_id]);

	/* WaForceWakeRenderDuringMmioTLBInvalidate:skl
	 * we need to put a forcewake when invalidating RCS TLB caches,
	 * otherwise device can go to RC6 state and interrupt invalidation
	 * process
	 */
	fw = intel_uncore_forcewake_for_reg(dev_priv, reg,
					    FW_REG_READ | FW_REG_WRITE);
	if (ring_id == RCS && (IS_SKYLAKE(dev_priv) || IS_KABYLAKE(dev_priv)))
		fw |= FORCEWAKE_RENDER;

	intel_uncore_forcewake_get(dev_priv, fw);

	I915_WRITE_FW(reg, 0x1);

	if (wait_for_atomic((I915_READ_FW(reg) == 0), 50))
		gvt_vgpu_err("timeout in invalidate ring (%d) tlb\n", ring_id);
	else
		vgpu_vreg(vgpu, regs[ring_id]) = 0;

	intel_uncore_forcewake_put(dev_priv, fw);

	gvt_dbg_core("invalidate TLB for ring %d\n", ring_id);
}

static void load_mocs(struct intel_vgpu *vgpu, int ring_id)
{
	struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
	i915_reg_t offset, l3_offset;
	u32 regs[] = {
		[RCS] = 0xc800,
		[VCS] = 0xc900,
		[VCS2] = 0xca00,
		[BCS] = 0xcc00,
		[VECS] = 0xcb00,
	};
	int i;

	if (WARN_ON(ring_id >= ARRAY_SIZE(regs)))
		return;

	offset.reg = regs[ring_id];
	for (i = 0; i < 64; i++) {
		gen9_render_mocs[ring_id][i] = I915_READ_FW(offset);
		I915_WRITE(offset, vgpu_vreg(vgpu, offset));
		offset.reg += 4;
	}

	if (ring_id == RCS) {
		l3_offset.reg = 0xb020;
		for (i = 0; i < 32; i++) {
			gen9_render_mocs_L3[i] = I915_READ_FW(l3_offset);
			I915_WRITE_FW(l3_offset, vgpu_vreg(vgpu, l3_offset));
			l3_offset.reg += 4;
		}
	}
}

static void restore_mocs(struct intel_vgpu *vgpu, int ring_id)
{
	struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
	i915_reg_t offset, l3_offset;
	u32 regs[] = {
		[RCS] = 0xc800,
		[VCS] = 0xc900,
		[VCS2] = 0xca00,
		[BCS] = 0xcc00,
		[VECS] = 0xcb00,
	};
	int i;

	if (WARN_ON(ring_id >= ARRAY_SIZE(regs)))
		return;

	offset.reg = regs[ring_id];
	for (i = 0; i < 64; i++) {
		vgpu_vreg(vgpu, offset) = I915_READ_FW(offset);
		I915_WRITE_FW(offset, gen9_render_mocs[ring_id][i]);
		offset.reg += 4;
	}

	if (ring_id == RCS) {
		l3_offset.reg = 0xb020;
		for (i = 0; i < 32; i++) {
			vgpu_vreg(vgpu, l3_offset) = I915_READ_FW(l3_offset);
			I915_WRITE_FW(l3_offset, gen9_render_mocs_L3[i]);
			l3_offset.reg += 4;
		}
	}
}

#define CTX_CONTEXT_CONTROL_VAL	0x03

/* Switch ring mmio values (context) from host to a vgpu. */
static void switch_mmio_to_vgpu(struct intel_vgpu *vgpu, int ring_id)
{
	struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
	struct render_mmio *mmio;
	u32 v;
	int i, array_size;
	u32 *reg_state = vgpu->shadow_ctx->engine[ring_id].lrc_reg_state;
	u32 ctx_ctrl = reg_state[CTX_CONTEXT_CONTROL_VAL];
	u32 inhibit_mask =
		_MASKED_BIT_ENABLE(CTX_CTRL_ENGINE_CTX_RESTORE_INHIBIT);
	i915_reg_t last_reg = _MMIO(0);

	if (IS_SKYLAKE(vgpu->gvt->dev_priv)
		|| IS_KABYLAKE(vgpu->gvt->dev_priv)) {
		mmio = gen9_render_mmio_list;
		array_size = ARRAY_SIZE(gen9_render_mmio_list);
		load_mocs(vgpu, ring_id);
	} else {
		mmio = gen8_render_mmio_list;
		array_size = ARRAY_SIZE(gen8_render_mmio_list);
	}

	for (i = 0; i < array_size; i++, mmio++) {
		if (mmio->ring_id != ring_id)
			continue;

		mmio->value = I915_READ_FW(mmio->reg);

		/*
		 * if it is an inhibit context, load in_context mmio
		 * into HW by mmio write. If it is not, skip this mmio
		 * write.
		 */
		if (mmio->in_context &&
				((ctx_ctrl & inhibit_mask) != inhibit_mask) &&
				i915.enable_execlists)
			continue;

		if (mmio->mask)
			v = vgpu_vreg(vgpu, mmio->reg) | (mmio->mask << 16);
		else
			v = vgpu_vreg(vgpu, mmio->reg);

		I915_WRITE_FW(mmio->reg, v);
		last_reg = mmio->reg;

		trace_render_mmio(vgpu->id, "load",
				  i915_mmio_reg_offset(mmio->reg),
				  mmio->value, v);
	}

	/* Make sure the swiched MMIOs has taken effect. */
	if (likely(INTEL_GVT_MMIO_OFFSET(last_reg)))
		I915_READ_FW(last_reg);

	handle_tlb_pending_event(vgpu, ring_id);
}

/* Switch ring mmio values (context) from vgpu to host. */
static void switch_mmio_to_host(struct intel_vgpu *vgpu, int ring_id)
{
	struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
	struct render_mmio *mmio;
	i915_reg_t last_reg = _MMIO(0);
	u32 v;
	int i, array_size;

	if (IS_SKYLAKE(dev_priv) || IS_KABYLAKE(dev_priv)) {
		mmio = gen9_render_mmio_list;
		array_size = ARRAY_SIZE(gen9_render_mmio_list);
		restore_mocs(vgpu, ring_id);
	} else {
		mmio = gen8_render_mmio_list;
		array_size = ARRAY_SIZE(gen8_render_mmio_list);
	}

	for (i = 0; i < array_size; i++, mmio++) {
		if (mmio->ring_id != ring_id)
			continue;

		vgpu_vreg(vgpu, mmio->reg) = I915_READ_FW(mmio->reg);

		if (mmio->mask) {
			vgpu_vreg(vgpu, mmio->reg) &= ~(mmio->mask << 16);
			v = mmio->value | (mmio->mask << 16);
		} else
			v = mmio->value;

		if (mmio->in_context)
			continue;

		I915_WRITE_FW(mmio->reg, v);
		last_reg = mmio->reg;

		trace_render_mmio(vgpu->id, "restore",
				  i915_mmio_reg_offset(mmio->reg),
				  mmio->value, v);
	}

	/* Make sure the swiched MMIOs has taken effect. */
	if (likely(INTEL_GVT_MMIO_OFFSET(last_reg)))
		I915_READ_FW(last_reg);
}

/**
 * intel_gvt_switch_render_mmio - switch mmio context of specific engine
 * @pre: the last vGPU that own the engine
 * @next: the vGPU to switch to
 * @ring_id: specify the engine
 *
 * If pre is null indicates that host own the engine. If next is null
 * indicates that we are switching to host workload.
 */
void intel_gvt_switch_mmio(struct intel_vgpu *pre,
			   struct intel_vgpu *next, int ring_id)
{
	struct drm_i915_private *dev_priv;

	if (WARN_ON(!pre && !next))
		return;

	gvt_dbg_render("switch ring %d from %s to %s\n", ring_id,
		       pre ? "vGPU" : "host", next ? "vGPU" : "HOST");

	dev_priv = pre ? pre->gvt->dev_priv : next->gvt->dev_priv;

	/**
	 * We are using raw mmio access wrapper to improve the
	 * performace for batch mmio read/write, so we need
	 * handle forcewake mannually.
	 */
	intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL);

	/**
	 * TODO: Optimize for vGPU to vGPU switch by merging
	 * switch_mmio_to_host() and switch_mmio_to_vgpu().
	 */
	if (pre)
		switch_mmio_to_host(pre, ring_id);

	if (next)
		switch_mmio_to_vgpu(next, ring_id);

	intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
}