/*
 * Copyright 2013 Advanced Micro Devices, Inc.
 * All Rights Reserved. 
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * THE 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. 
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software. 
 *
 * Authors: Christian König <christian.koenig@amd.com>
 */

#include <linux/firmware.h>
#include <linux/module.h>
#include <drm/drmP.h>
#include <drm/drm.h>

#include "amdgpu.h"
#include "amdgpu_pm.h"
#include "amdgpu_vce.h"
#include "cikd.h"

/* 1 second timeout */
#define VCE_IDLE_TIMEOUT	msecs_to_jiffies(1000)

/* Firmware Names */
#ifdef CONFIG_DRM_AMDGPU_CIK
#define FIRMWARE_BONAIRE	"amdgpu/bonaire_vce.bin"
#define FIRMWARE_KABINI	"amdgpu/kabini_vce.bin"
#define FIRMWARE_KAVERI	"amdgpu/kaveri_vce.bin"
#define FIRMWARE_HAWAII	"amdgpu/hawaii_vce.bin"
#define FIRMWARE_MULLINS	"amdgpu/mullins_vce.bin"
#endif
#define FIRMWARE_TONGA		"amdgpu/tonga_vce.bin"
#define FIRMWARE_CARRIZO	"amdgpu/carrizo_vce.bin"
#define FIRMWARE_FIJI		"amdgpu/fiji_vce.bin"
#define FIRMWARE_STONEY		"amdgpu/stoney_vce.bin"
#define FIRMWARE_POLARIS10	"amdgpu/polaris10_vce.bin"
#define FIRMWARE_POLARIS11	"amdgpu/polaris11_vce.bin"
#define FIRMWARE_POLARIS12	"amdgpu/polaris12_vce.bin"
#define FIRMWARE_VEGAM		"amdgpu/vegam_vce.bin"

#define FIRMWARE_VEGA10		"amdgpu/vega10_vce.bin"
#define FIRMWARE_VEGA12		"amdgpu/vega12_vce.bin"
#define FIRMWARE_VEGA20		"amdgpu/vega20_vce.bin"

#ifdef CONFIG_DRM_AMDGPU_CIK
MODULE_FIRMWARE(FIRMWARE_BONAIRE);
MODULE_FIRMWARE(FIRMWARE_KABINI);
MODULE_FIRMWARE(FIRMWARE_KAVERI);
MODULE_FIRMWARE(FIRMWARE_HAWAII);
MODULE_FIRMWARE(FIRMWARE_MULLINS);
#endif
MODULE_FIRMWARE(FIRMWARE_TONGA);
MODULE_FIRMWARE(FIRMWARE_CARRIZO);
MODULE_FIRMWARE(FIRMWARE_FIJI);
MODULE_FIRMWARE(FIRMWARE_STONEY);
MODULE_FIRMWARE(FIRMWARE_POLARIS10);
MODULE_FIRMWARE(FIRMWARE_POLARIS11);
MODULE_FIRMWARE(FIRMWARE_POLARIS12);
MODULE_FIRMWARE(FIRMWARE_VEGAM);

MODULE_FIRMWARE(FIRMWARE_VEGA10);
MODULE_FIRMWARE(FIRMWARE_VEGA12);
MODULE_FIRMWARE(FIRMWARE_VEGA20);

static void amdgpu_vce_idle_work_handler(struct work_struct *work);

/**
 * amdgpu_vce_init - allocate memory, load vce firmware
 *
 * @adev: amdgpu_device pointer
 *
 * First step to get VCE online, allocate memory and load the firmware
 */
int amdgpu_vce_sw_init(struct amdgpu_device *adev, unsigned long size)
{
	const char *fw_name;
	const struct common_firmware_header *hdr;
	unsigned ucode_version, version_major, version_minor, binary_id;
	int i, r;

	switch (adev->asic_type) {
#ifdef CONFIG_DRM_AMDGPU_CIK
	case CHIP_BONAIRE:
		fw_name = FIRMWARE_BONAIRE;
		break;
	case CHIP_KAVERI:
		fw_name = FIRMWARE_KAVERI;
		break;
	case CHIP_KABINI:
		fw_name = FIRMWARE_KABINI;
		break;
	case CHIP_HAWAII:
		fw_name = FIRMWARE_HAWAII;
		break;
	case CHIP_MULLINS:
		fw_name = FIRMWARE_MULLINS;
		break;
#endif
	case CHIP_TONGA:
		fw_name = FIRMWARE_TONGA;
		break;
	case CHIP_CARRIZO:
		fw_name = FIRMWARE_CARRIZO;
		break;
	case CHIP_FIJI:
		fw_name = FIRMWARE_FIJI;
		break;
	case CHIP_STONEY:
		fw_name = FIRMWARE_STONEY;
		break;
	case CHIP_POLARIS10:
		fw_name = FIRMWARE_POLARIS10;
		break;
	case CHIP_POLARIS11:
		fw_name = FIRMWARE_POLARIS11;
		break;
	case CHIP_POLARIS12:
		fw_name = FIRMWARE_POLARIS12;
		break;
	case CHIP_VEGAM:
		fw_name = FIRMWARE_VEGAM;
		break;
	case CHIP_VEGA10:
		fw_name = FIRMWARE_VEGA10;
		break;
	case CHIP_VEGA12:
		fw_name = FIRMWARE_VEGA12;
		break;
	case CHIP_VEGA20:
		fw_name = FIRMWARE_VEGA20;
		break;

	default:
		return -EINVAL;
	}

	r = request_firmware(&adev->vce.fw, fw_name, adev->dev);
	if (r) {
		dev_err(adev->dev, "amdgpu_vce: Can't load firmware \"%s\"\n",
			fw_name);
		return r;
	}

	r = amdgpu_ucode_validate(adev->vce.fw);
	if (r) {
		dev_err(adev->dev, "amdgpu_vce: Can't validate firmware \"%s\"\n",
			fw_name);
		release_firmware(adev->vce.fw);
		adev->vce.fw = NULL;
		return r;
	}

	hdr = (const struct common_firmware_header *)adev->vce.fw->data;

	ucode_version = le32_to_cpu(hdr->ucode_version);
	version_major = (ucode_version >> 20) & 0xfff;
	version_minor = (ucode_version >> 8) & 0xfff;
	binary_id = ucode_version & 0xff;
	DRM_INFO("Found VCE firmware Version: %hhd.%hhd Binary ID: %hhd\n",
		version_major, version_minor, binary_id);
	adev->vce.fw_version = ((version_major << 24) | (version_minor << 16) |
				(binary_id << 8));

	r = amdgpu_bo_create_kernel(adev, size, PAGE_SIZE,
				    AMDGPU_GEM_DOMAIN_VRAM, &adev->vce.vcpu_bo,
				    &adev->vce.gpu_addr, &adev->vce.cpu_addr);
	if (r) {
		dev_err(adev->dev, "(%d) failed to allocate VCE bo\n", r);
		return r;
	}

	for (i = 0; i < AMDGPU_MAX_VCE_HANDLES; ++i) {
		atomic_set(&adev->vce.handles[i], 0);
		adev->vce.filp[i] = NULL;
	}

	INIT_DELAYED_WORK(&adev->vce.idle_work, amdgpu_vce_idle_work_handler);
	mutex_init(&adev->vce.idle_mutex);

	return 0;
}

/**
 * amdgpu_vce_fini - free memory
 *
 * @adev: amdgpu_device pointer
 *
 * Last step on VCE teardown, free firmware memory
 */
int amdgpu_vce_sw_fini(struct amdgpu_device *adev)
{
	unsigned i;

	if (adev->vce.vcpu_bo == NULL)
		return 0;

	drm_sched_entity_destroy(&adev->vce.entity);

	amdgpu_bo_free_kernel(&adev->vce.vcpu_bo, &adev->vce.gpu_addr,
		(void **)&adev->vce.cpu_addr);

	for (i = 0; i < adev->vce.num_rings; i++)
		amdgpu_ring_fini(&adev->vce.ring[i]);

	release_firmware(adev->vce.fw);
	mutex_destroy(&adev->vce.idle_mutex);

	return 0;
}

/**
 * amdgpu_vce_entity_init - init entity
 *
 * @adev: amdgpu_device pointer
 *
 */
int amdgpu_vce_entity_init(struct amdgpu_device *adev)
{
	struct amdgpu_ring *ring;
	struct drm_sched_rq *rq;
	int r;

	ring = &adev->vce.ring[0];
	rq = &ring->sched.sched_rq[DRM_SCHED_PRIORITY_NORMAL];
	r = drm_sched_entity_init(&adev->vce.entity, &rq, 1, NULL);
	if (r ! = 0) {
		DRM_ERROR("Failed setting up VCE run queue.\n");
		return r;
	}

	return 0;
}

/**
 * amdgpu_vce_suspend - unpin VCE fw memory
 *
 * @adev: amdgpu_device pointer
 *
 */
int amdgpu_vce_suspend(struct amdgpu_device *adev)
{
	int i;

	cancel_delayed_work_sync(&adev->vce.idle_work);

	if (adev->vce.vcpu_bo == NULL)
		return 0;

	for (i = 0; i < AMDGPU_MAX_VCE_HANDLES; ++i)
		if (atomic_read(&adev->vce.handles[i]))
			break;

	if (i == AMDGPU_MAX_VCE_HANDLES)
		return 0;

	/* TODO: suspending running encoding sessions isn't supported */
	return -EINVAL;
}

/**
 * amdgpu_vce_resume - pin VCE fw memory
 *
 * @adev: amdgpu_device pointer
 *
 */
int amdgpu_vce_resume(struct amdgpu_device *adev)
{
	void *cpu_addr;
	const struct common_firmware_header *hdr;
	unsigned offset;
	int r;

	if (adev->vce.vcpu_bo == NULL)
		return -EINVAL;

	r = amdgpu_bo_reserve(adev->vce.vcpu_bo, false);
	if (r) {
		dev_err(adev->dev, "(%d) failed to reserve VCE bo\n", r);
		return r;
	}

	r = amdgpu_bo_kmap(adev->vce.vcpu_bo, &cpu_addr);
	if (r) {
		amdgpu_bo_unreserve(adev->vce.vcpu_bo);
		dev_err(adev->dev, "(%d) VCE map failed\n", r);
		return r;
	}

	hdr = (const struct common_firmware_header *)adev->vce.fw->data;
	offset = le32_to_cpu(hdr->ucode_array_offset_bytes);
	memcpy_toio(cpu_addr, adev->vce.fw->data + offset,
		    adev->vce.fw->size - offset);

	amdgpu_bo_kunmap(adev->vce.vcpu_bo);

	amdgpu_bo_unreserve(adev->vce.vcpu_bo);

	return 0;
}

/**
 * amdgpu_vce_idle_work_handler - power off VCE
 *
 * @work: pointer to work structure
 *
 * power of VCE when it's not used any more
 */
static void amdgpu_vce_idle_work_handler(struct work_struct *work)
{
	struct amdgpu_device *adev =
		container_of(work, struct amdgpu_device, vce.idle_work.work);
	unsigned i, count = 0;

	for (i = 0; i < adev->vce.num_rings; i++)
		count += amdgpu_fence_count_emitted(&adev->vce.ring[i]);

	if (count == 0) {
		if (adev->pm.dpm_enabled) {
			amdgpu_dpm_enable_vce(adev, false);
		} else {
			amdgpu_asic_set_vce_clocks(adev, 0, 0);
			amdgpu_device_ip_set_powergating_state(adev, AMD_IP_BLOCK_TYPE_VCE,
							       AMD_PG_STATE_GATE);
			amdgpu_device_ip_set_clockgating_state(adev, AMD_IP_BLOCK_TYPE_VCE,
							       AMD_CG_STATE_GATE);
		}
	} else {
		schedule_delayed_work(&adev->vce.idle_work, VCE_IDLE_TIMEOUT);
	}
}

/**
 * amdgpu_vce_ring_begin_use - power up VCE
 *
 * @ring: amdgpu ring
 *
 * Make sure VCE is powerd up when we want to use it
 */
void amdgpu_vce_ring_begin_use(struct amdgpu_ring *ring)
{
	struct amdgpu_device *adev = ring->adev;
	bool set_clocks;

	if (amdgpu_sriov_vf(adev))
		return;

	mutex_lock(&adev->vce.idle_mutex);
	set_clocks = ! cancel_delayed_work_sync(&adev->vce.idle_work);
	if (set_clocks) {
		if (adev->pm.dpm_enabled) {
			amdgpu_dpm_enable_vce(adev, true);
		} else {
			amdgpu_asic_set_vce_clocks(adev, 53300, 40000);
			amdgpu_device_ip_set_clockgating_state(adev, AMD_IP_BLOCK_TYPE_VCE,
							       AMD_CG_STATE_UNGATE);
			amdgpu_device_ip_set_powergating_state(adev, AMD_IP_BLOCK_TYPE_VCE,
							       AMD_PG_STATE_UNGATE);

		}
	}
	mutex_unlock(&adev->vce.idle_mutex);
}

/**
 * amdgpu_vce_ring_end_use - power VCE down
 *
 * @ring: amdgpu ring
 *
 * Schedule work to power VCE down again
 */
void amdgpu_vce_ring_end_use(struct amdgpu_ring *ring)
{
	if (! amdgpu_sriov_vf(ring->adev))
		schedule_delayed_work(&ring->adev->vce.idle_work, VCE_IDLE_TIMEOUT);
}

/**
 * amdgpu_vce_free_handles - free still open VCE handles
 *
 * @adev: amdgpu_device pointer
 * @filp: drm file pointer
 *
 * Close all VCE handles still open by this file pointer
 */
void amdgpu_vce_free_handles(struct amdgpu_device *adev, struct drm_file *filp)
{
	struct amdgpu_ring *ring = &adev->vce.ring[0];
	int i, r;
	for (i = 0; i < AMDGPU_MAX_VCE_HANDLES; ++i) {
		uint32_t handle = atomic_read(&adev->vce.handles[i]);

		if (! handle || adev->vce.filp[i] ! = filp)
			continue;

		r = amdgpu_vce_get_destroy_msg(ring, handle, false, NULL);
		if (r)
			DRM_ERROR("Error destroying VCE handle (%d)!\n", r);

		adev->vce.filp[i] = NULL;
		atomic_set(&adev->vce.handles[i], 0);
	}
}

/**
 * amdgpu_vce_get_create_msg - generate a VCE create msg
 *
 * @adev: amdgpu_device pointer
 * @ring: ring we should submit the msg to
 * @handle: VCE session handle to use
 * @fence: optional fence to return
 *
 * Open up a stream for HW test
 */
int amdgpu_vce_get_create_msg(struct amdgpu_ring *ring, uint32_t handle,
			      struct dma_fence **fence)
{
	const unsigned ib_size_dw = 1024;
	struct amdgpu_job *job;
	struct amdgpu_ib *ib;
	struct dma_fence *f = NULL;
	uint64_t dummy;
	int i, r;

	r = amdgpu_job_alloc_with_ib(ring->adev, ib_size_dw * 4, &job);
	if (r)
		return r;

	ib = &job->ibs[0];

	dummy = ib->gpu_addr + 1024;

	/* stitch together an VCE create msg */
	ib->length_dw = 0;
	ib->ptr[ib->length_dw++] = 0x0000000c; /* len */
	ib->ptr[ib->length_dw++] = 0x00000001; /* session cmd */
	ib->ptr[ib->length_dw++] = handle;

	if ((ring->adev->vce.fw_version >> 24) >= 52)
		ib->ptr[ib->length_dw++] = 0x00000040; /* len */
	else
		ib->ptr[ib->length_dw++] = 0x00000030; /* len */
	ib->ptr[ib->length_dw++] = 0x01000001; /* create cmd */
	ib->ptr[ib->length_dw++] = 0x00000000;
	ib->ptr[ib->length_dw++] = 0x00000042;
	ib->ptr[ib->length_dw++] = 0x0000000a;
	ib->ptr[ib->length_dw++] = 0x00000001;
	ib->ptr[ib->length_dw++] = 0x00000080;
	ib->ptr[ib->length_dw++] = 0x00000060;
	ib->ptr[ib->length_dw++] = 0x00000100;
	ib->ptr[ib->length_dw++] = 0x00000100;
	ib->ptr[ib->length_dw++] = 0x0000000c;
	ib->ptr[ib->length_dw++] = 0x00000000;
	if ((ring->adev->vce.fw_version >> 24) >= 52) {
		ib->ptr[ib->length_dw++] = 0x00000000;
		ib->ptr[ib->length_dw++] = 0x00000000;
		ib->ptr[ib->length_dw++] = 0x00000000;
		ib->ptr[ib->length_dw++] = 0x00000000;
	}

	ib->ptr[ib->length_dw++] = 0x00000014; /* len */
	ib->ptr[ib->length_dw++] = 0x05000005; /* feedback buffer */
	ib->ptr[ib->length_dw++] = upper_32_bits(dummy);
	ib->ptr[ib->length_dw++] = dummy;
	ib->ptr[ib->length_dw++] = 0x00000001;

	for (i = ib->length_dw; i < ib_size_dw; ++i)
		ib->ptr[i] = 0x0;

	r = amdgpu_job_submit_direct(job, ring, &f);
	if (r)
		goto err;

	if (fence)
		*fence = dma_fence_get(f);
	dma_fence_put(f);
	return 0;

err:
	amdgpu_job_free(job);
	return r;
}

/**
 * amdgpu_vce_get_destroy_msg - generate a VCE destroy msg
 *
 * @adev: amdgpu_device pointer
 * @ring: ring we should submit the msg to
 * @handle: VCE session handle to use
 * @fence: optional fence to return
 *
 * Close up a stream for HW test or if userspace failed to do so
 */
int amdgpu_vce_get_destroy_msg(struct amdgpu_ring *ring, uint32_t handle,
			       bool direct, struct dma_fence **fence)
{
	const unsigned ib_size_dw = 1024;
	struct amdgpu_job *job;
	struct amdgpu_ib *ib;
	struct dma_fence *f = NULL;
	int i, r;

	r = amdgpu_job_alloc_with_ib(ring->adev, ib_size_dw * 4, &job);
	if (r)
		return r;

	ib = &job->ibs[0];

	/* stitch together an VCE destroy msg */
	ib->length_dw = 0;
	ib->ptr[ib->length_dw++] = 0x0000000c; /* len */
	ib->ptr[ib->length_dw++] = 0x00000001; /* session cmd */
	ib->ptr[ib->length_dw++] = handle;

	ib->ptr[ib->length_dw++] = 0x00000020; /* len */
	ib->ptr[ib->length_dw++] = 0x00000002; /* task info */
	ib->ptr[ib->length_dw++] = 0xffffffff; /* next task info, set to 0xffffffff if no */
	ib->ptr[ib->length_dw++] = 0x00000001; /* destroy session */
	ib->ptr[ib->length_dw++] = 0x00000000;
	ib->ptr[ib->length_dw++] = 0x00000000;
	ib->ptr[ib->length_dw++] = 0xffffffff; /* feedback is not needed, set to 0xffffffff and firmware will not output feedback */
	ib->ptr[ib->length_dw++] = 0x00000000;

	ib->ptr[ib->length_dw++] = 0x00000008; /* len */
	ib->ptr[ib->length_dw++] = 0x02000001; /* destroy cmd */

	for (i = ib->length_dw; i < ib_size_dw; ++i)
		ib->ptr[i] = 0x0;

	if (direct)
		r = amdgpu_job_submit_direct(job, ring, &f);
	else
		r = amdgpu_job_submit(job, &ring->adev->vce.entity,
				      AMDGPU_FENCE_OWNER_UNDEFINED, &f);
	if (r)
		goto err;

	if (fence)
		*fence = dma_fence_get(f);
	dma_fence_put(f);
	return 0;

err:
	amdgpu_job_free(job);
	return r;
}

/**
 * amdgpu_vce_cs_validate_bo - make sure not to cross 4GB boundary
 *
 * @p: parser context
 * @lo: address of lower dword
 * @hi: address of higher dword
 * @size: minimum size
 * @index: bs/fb index
 *
 * Make sure that no BO cross a 4GB boundary. 
 */
static int amdgpu_vce_validate_bo(struct amdgpu_cs_parser *p, uint32_t ib_idx,
				  int lo, int hi, unsigned size, int32_t index)
{
	int64_t offset = ((uint64_t)size) * ((int64_t)index);
	struct ttm_operation_ctx ctx = { false, false };
	struct amdgpu_bo_va_mapping *mapping;
	unsigned i, fpfn, lpfn;
	struct amdgpu_bo *bo;
	uint64_t addr;
	int r;

	addr = ((uint64_t)amdgpu_get_ib_value(p, ib_idx, lo)) |
	       ((uint64_t)amdgpu_get_ib_value(p, ib_idx, hi)) << 32;
	if (index >= 0) {
		addr += offset;
		fpfn = PAGE_ALIGN(offset) >> PAGE_SHIFT;
		lpfn = 0x100000000ULL >> PAGE_SHIFT;
	} else {
		fpfn = 0;
		lpfn = (0x100000000ULL - PAGE_ALIGN(offset)) >> PAGE_SHIFT;
	}

	r = amdgpu_cs_find_mapping(p, addr, &bo, &mapping);
	if (r) {
		DRM_ERROR("Can't find BO for addr 0x%010Lx %d %d %d %d\n",
			  addr, lo, hi, size, index);
		return r;
	}

	for (i = 0; i < bo->placement.num_placement; ++i) {
		bo->placements[i].fpfn = max(bo->placements[i].fpfn, fpfn);
		bo->placements[i].lpfn = bo->placements[i].lpfn ? 
			min(bo->placements[i].lpfn, lpfn) : lpfn;
	}
	return ttm_bo_validate(&bo->tbo, &bo->placement, &ctx);
}


/**
 * amdgpu_vce_cs_reloc - command submission relocation
 *
 * @p: parser context
 * @lo: address of lower dword
 * @hi: address of higher dword
 * @size: minimum size
 *
 * Patch relocation inside command stream with real buffer address
 */
static int amdgpu_vce_cs_reloc(struct amdgpu_cs_parser *p, uint32_t ib_idx,
			       int lo, int hi, unsigned size, uint32_t index)
{
	struct amdgpu_bo_va_mapping *mapping;
	struct amdgpu_bo *bo;
	uint64_t addr;
	int r;

	if (index == 0xffffffff)
		index = 0;

	addr = ((uint64_t)amdgpu_get_ib_value(p, ib_idx, lo)) |
	       ((uint64_t)amdgpu_get_ib_value(p, ib_idx, hi)) << 32;
	addr += ((uint64_t)size) * ((uint64_t)index);

	r = amdgpu_cs_find_mapping(p, addr, &bo, &mapping);
	if (r) {
		DRM_ERROR("Can't find BO for addr 0x%010Lx %d %d %d %d\n",
			  addr, lo, hi, size, index);
		return r;
	}

	if ((addr + (uint64_t)size) >
	    (mapping->last + 1) * AMDGPU_GPU_PAGE_SIZE) {
		DRM_ERROR("BO to small for addr 0x%010Lx %d %d\n",
			  addr, lo, hi);
		return -EINVAL;
	}

	addr -= mapping->start * AMDGPU_GPU_PAGE_SIZE;
	addr += amdgpu_bo_gpu_offset(bo);
	addr -= ((uint64_t)size) * ((uint64_t)index);

	amdgpu_set_ib_value(p, ib_idx, lo, lower_32_bits(addr));
	amdgpu_set_ib_value(p, ib_idx, hi, upper_32_bits(addr));

	return 0;
}

/**
 * amdgpu_vce_validate_handle - validate stream handle
 *
 * @p: parser context
 * @handle: handle to validate
 * @allocated: allocated a new handle? 
 *
 * Validates the handle and return the found session index or -EINVAL
 * we we don't have another free session index. 
 */
static int amdgpu_vce_validate_handle(struct amdgpu_cs_parser *p,
				      uint32_t handle, uint32_t *allocated)
{
	unsigned i;

	/* validate the handle */
	for (i = 0; i < AMDGPU_MAX_VCE_HANDLES; ++i) {
		if (atomic_read(&p->adev->vce.handles[i]) == handle) {
			if (p->adev->vce.filp[i] ! = p->filp) {
				DRM_ERROR("VCE handle collision detected!\n");
				return -EINVAL;
			}
			return i;
		}
	}

	/* handle not found try to alloc a new one */
	for (i = 0; i < AMDGPU_MAX_VCE_HANDLES; ++i) {
		if (! atomic_cmpxchg(&p->adev->vce.handles[i], 0, handle)) {
			p->adev->vce.filp[i] = p->filp;
			p->adev->vce.img_size[i] = 0;
			*allocated |= 1 << i;
			return i;
		}
	}

	DRM_ERROR("No more free VCE handles!\n");
	return -EINVAL;
}

/**
 * amdgpu_vce_cs_parse - parse and validate the command stream
 *
 * @p: parser context
 *
 */
int amdgpu_vce_ring_parse_cs(struct amdgpu_cs_parser *p, uint32_t ib_idx)
{
	struct amdgpu_ib *ib = &p->job->ibs[ib_idx];
	unsigned fb_idx = 0, bs_idx = 0;
	int session_idx = -1;
	uint32_t destroyed = 0;
	uint32_t created = 0;
	uint32_t allocated = 0;
	uint32_t tmp, handle = 0;
	uint32_t *size = &tmp;
	unsigned idx;
	int i, r = 0;

	p->job->vm = NULL;
	ib->gpu_addr = amdgpu_sa_bo_gpu_addr(ib->sa_bo);

	for (idx = 0; idx < ib->length_dw;) {
		uint32_t len = amdgpu_get_ib_value(p, ib_idx, idx);
		uint32_t cmd = amdgpu_get_ib_value(p, ib_idx, idx + 1);

		if ((len < 8) || (len & 3)) {
			DRM_ERROR("invalid VCE command length (%d)!\n", len);
			r = -EINVAL;
			goto out;
		}

		switch (cmd) {
		case 0x00000002: /* task info */
			fb_idx = amdgpu_get_ib_value(p, ib_idx, idx + 6);
			bs_idx = amdgpu_get_ib_value(p, ib_idx, idx + 7);
			break;

		case 0x03000001: /* encode */
			r = amdgpu_vce_validate_bo(p, ib_idx, idx + 10,
						   idx + 9, 0, 0);
			if (r)
				goto out;

			r = amdgpu_vce_validate_bo(p, ib_idx, idx + 12,
						   idx + 11, 0, 0);
			if (r)
				goto out;
			break;

		case 0x05000001: /* context buffer */
			r = amdgpu_vce_validate_bo(p, ib_idx, idx + 3,
						   idx + 2, 0, 0);
			if (r)
				goto out;
			break;

		case 0x05000004: /* video bitstream buffer */
			tmp = amdgpu_get_ib_value(p, ib_idx, idx + 4);
			r = amdgpu_vce_validate_bo(p, ib_idx, idx + 3, idx + 2,
						   tmp, bs_idx);
			if (r)
				goto out;
			break;

		case 0x05000005: /* feedback buffer */
			r = amdgpu_vce_validate_bo(p, ib_idx, idx + 3, idx + 2,
						   4096, fb_idx);
			if (r)
				goto out;
			break;

		case 0x0500000d: /* MV buffer */
			r = amdgpu_vce_validate_bo(p, ib_idx, idx + 3,
							idx + 2, 0, 0);
			if (r)
				goto out;

			r = amdgpu_vce_validate_bo(p, ib_idx, idx + 8,
							idx + 7, 0, 0);
			if (r)
				goto out;
			break;
		}

		idx += len / 4;
	}

	for (idx = 0; idx < ib->length_dw;) {
		uint32_t len = amdgpu_get_ib_value(p, ib_idx, idx);
		uint32_t cmd = amdgpu_get_ib_value(p, ib_idx, idx + 1);

		switch (cmd) {
		case 0x00000001: /* session */
			handle = amdgpu_get_ib_value(p, ib_idx, idx + 2);
			session_idx = amdgpu_vce_validate_handle(p, handle,
								 &allocated);
			if (session_idx < 0) {
				r = session_idx;
				goto out;
			}
			size = &p->adev->vce.img_size[session_idx];
			break;

		case 0x00000002: /* task info */
			fb_idx = amdgpu_get_ib_value(p, ib_idx, idx + 6);
			bs_idx = amdgpu_get_ib_value(p, ib_idx, idx + 7);
			break;

		case 0x01000001: /* create */
			created |= 1 << session_idx;
			if (destroyed & (1 << session_idx)) {
				destroyed &= ~(1 << session_idx);
				allocated |= 1 << session_idx;

			} else if (!( allocated & (1 << session_idx))) {
				DRM_ERROR("Handle already in use!\n");
				r = -EINVAL;
				goto out;
			}

			*size = amdgpu_get_ib_value(p, ib_idx, idx + 8) *
				amdgpu_get_ib_value(p, ib_idx, idx + 10) *
				8 * 3 / 2;
			break;

		case 0x04000001: /* config extension */
		case 0x04000002: /* pic control */
		case 0x04000005: /* rate control */
		case 0x04000007: /* motion estimation */
		case 0x04000008: /* rdo */
		case 0x04000009: /* vui */
		case 0x05000002: /* auxiliary buffer */
		case 0x05000009: /* clock table */
			break;

		case 0x0500000c: /* hw config */
			switch (p->adev->asic_type) {
#ifdef CONFIG_DRM_AMDGPU_CIK
			case CHIP_KAVERI:
			case CHIP_MULLINS:
#endif
			case CHIP_CARRIZO:
				break;
			default:
				r = -EINVAL;
				goto out;
			}
			break;

		case 0x03000001: /* encode */
			r = amdgpu_vce_cs_reloc(p, ib_idx, idx + 10, idx + 9,
						*size, 0);
			if (r)
				goto out;

			r = amdgpu_vce_cs_reloc(p, ib_idx, idx + 12, idx + 11,
						*size / 3, 0);
			if (r)
				goto out;
			break;

		case 0x02000001: /* destroy */
			destroyed |= 1 << session_idx;
			break;

		case 0x05000001: /* context buffer */
			r = amdgpu_vce_cs_reloc(p, ib_idx, idx + 3, idx + 2,
						*size * 2, 0);
			if (r)
				goto out;
			break;

		case 0x05000004: /* video bitstream buffer */
			tmp = amdgpu_get_ib_value(p, ib_idx, idx + 4);
			r = amdgpu_vce_cs_reloc(p, ib_idx, idx + 3, idx + 2,
						tmp, bs_idx);
			if (r)
				goto out;
			break;

		case 0x05000005: /* feedback buffer */
			r = amdgpu_vce_cs_reloc(p, ib_idx, idx + 3, idx + 2,
						4096, fb_idx);
			if (r)
				goto out;
			break;

		case 0x0500000d: /* MV buffer */
			r = amdgpu_vce_cs_reloc(p, ib_idx, idx + 3,
							idx + 2, *size, 0);
			if (r)
				goto out;

			r = amdgpu_vce_cs_reloc(p, ib_idx, idx + 8,
							idx + 7, *size / 12, 0);
			if (r)
				goto out;
			break;

		default:
			DRM_ERROR("invalid VCE command (0x%x)!\n", cmd);
			r = -EINVAL;
			goto out;
		}

		if (session_idx == -1) {
			DRM_ERROR("no session command at start of IB\n");
			r = -EINVAL;
			goto out;
		}

		idx += len / 4;
	}

	if (allocated & ~created) {
		DRM_ERROR("New session without create command!\n");
		r = -ENOENT;
	}

out:
	if (! r) {
		/* No error, free all destroyed handle slots */
		tmp = destroyed;
	} else {
		/* Error during parsing, free all allocated handle slots */
		tmp = allocated;
	}

	for (i = 0; i < AMDGPU_MAX_VCE_HANDLES; ++i)
		if (tmp & (1 << i))
			atomic_set(&p->adev->vce.handles[i], 0);

	return r;
}

/**
 * amdgpu_vce_cs_parse_vm - parse the command stream in VM mode
 *
 * @p: parser context
 *
 */
int amdgpu_vce_ring_parse_cs_vm(struct amdgpu_cs_parser *p, uint32_t ib_idx)
{
	struct amdgpu_ib *ib = &p->job->ibs[ib_idx];
	int session_idx = -1;
	uint32_t destroyed = 0;
	uint32_t created = 0;
	uint32_t allocated = 0;
	uint32_t tmp, handle = 0;
	int i, r = 0, idx = 0;

	while (idx < ib->length_dw) {
		uint32_t len = amdgpu_get_ib_value(p, ib_idx, idx);
		uint32_t cmd = amdgpu_get_ib_value(p, ib_idx, idx + 1);

		if ((len < 8) || (len & 3)) {
			DRM_ERROR("invalid VCE command length (%d)!\n", len);
			r = -EINVAL;
			goto out;
		}

		switch (cmd) {
		case 0x00000001: /* session */
			handle = amdgpu_get_ib_value(p, ib_idx, idx + 2);
			session_idx = amdgpu_vce_validate_handle(p, handle,
								 &allocated);
			if (session_idx < 0) {
				r = session_idx;
				goto out;
			}
			break;

		case 0x01000001: /* create */
			created |= 1 << session_idx;
			if (destroyed & (1 << session_idx)) {
				destroyed &= ~(1 << session_idx);
				allocated |= 1 << session_idx;

			} else if (!( allocated & (1 << session_idx))) {
				DRM_ERROR("Handle already in use!\n");
				r = -EINVAL;
				goto out;
			}

			break;

		case 0x02000001: /* destroy */
			destroyed |= 1 << session_idx;
			break;

		default:
			break;
		}

		if (session_idx == -1) {
			DRM_ERROR("no session command at start of IB\n");
			r = -EINVAL;
			goto out;
		}

		idx += len / 4;
	}

	if (allocated & ~created) {
		DRM_ERROR("New session without create command!\n");
		r = -ENOENT;
	}

out:
	if (! r) {
		/* No error, free all destroyed handle slots */
		tmp = destroyed;
		amdgpu_ib_free(p->adev, ib, NULL);
	} else {
		/* Error during parsing, free all allocated handle slots */
		tmp = allocated;
	}

	for (i = 0; i < AMDGPU_MAX_VCE_HANDLES; ++i)
		if (tmp & (1 << i))
			atomic_set(&p->adev->vce.handles[i], 0);

	return r;
}

/**
 * amdgpu_vce_ring_emit_ib - execute indirect buffer
 *
 * @ring: engine to use
 * @ib: the IB to execute
 *
 */
void amdgpu_vce_ring_emit_ib(struct amdgpu_ring *ring, struct amdgpu_ib *ib,
			     unsigned vmid, bool ctx_switch)
{
	amdgpu_ring_write(ring, VCE_CMD_IB);
	amdgpu_ring_write(ring, lower_32_bits(ib->gpu_addr));
	amdgpu_ring_write(ring, upper_32_bits(ib->gpu_addr));
	amdgpu_ring_write(ring, ib->length_dw);
}

/**
 * amdgpu_vce_ring_emit_fence - add a fence command to the ring
 *
 * @ring: engine to use
 * @fence: the fence
 *
 */
void amdgpu_vce_ring_emit_fence(struct amdgpu_ring *ring, u64 addr, u64 seq,
				unsigned flags)
{
	WARN_ON(flags & AMDGPU_FENCE_FLAG_64BIT);

	amdgpu_ring_write(ring, VCE_CMD_FENCE);
	amdgpu_ring_write(ring, addr);
	amdgpu_ring_write(ring, upper_32_bits(addr));
	amdgpu_ring_write(ring, seq);
	amdgpu_ring_write(ring, VCE_CMD_TRAP);
	amdgpu_ring_write(ring, VCE_CMD_END);
}

/**
 * amdgpu_vce_ring_test_ring - test if VCE ring is working
 *
 * @ring: the engine to test on
 *
 */
int amdgpu_vce_ring_test_ring(struct amdgpu_ring *ring)
{
	struct amdgpu_device *adev = ring->adev;
	uint32_t rptr;
	unsigned i;
	int r, timeout = adev->usec_timeout;

	/* skip ring test for sriov*/
	if (amdgpu_sriov_vf(adev))
		return 0;

	r = amdgpu_ring_alloc(ring, 16);
	if (r) {
		DRM_ERROR("amdgpu: vce failed to lock ring %d (%d).\n",
			  ring->idx, r);
		return r;
	}

	rptr = amdgpu_ring_get_rptr(ring);

	amdgpu_ring_write(ring, VCE_CMD_END);
	amdgpu_ring_commit(ring);

	for (i = 0; i < timeout; i++) {
		if (amdgpu_ring_get_rptr(ring) ! = rptr)
			break;
		DRM_UDELAY(1);
	}

	if (i < timeout) {
		DRM_DEBUG("ring test on %d succeeded in %d usecs\n",
			 ring->idx, i);
	} else {
		DRM_ERROR("amdgpu: ring %d test failed\n",
			  ring->idx);
		r = -ETIMEDOUT;
	}

	return r;
}

/**
 * amdgpu_vce_ring_test_ib - test if VCE IBs are working
 *
 * @ring: the engine to test on
 *
 */
int amdgpu_vce_ring_test_ib(struct amdgpu_ring *ring, long timeout)
{
	struct dma_fence *fence = NULL;
	long r;

	/* skip vce ring1/2 ib test for now, since it's not reliable */
	if (ring ! = &ring->adev->vce.ring[0])
		return 0;

	r = amdgpu_vce_get_create_msg(ring, 1, NULL);
	if (r) {
		DRM_ERROR("amdgpu: failed to get create msg (%ld).\n", r);
		goto error;
	}

	r = amdgpu_vce_get_destroy_msg(ring, 1, true, &fence);
	if (r) {
		DRM_ERROR("amdgpu: failed to get destroy ib (%ld).\n", r);
		goto error;
	}

	r = dma_fence_wait_timeout(fence, false, timeout);
	if (r == 0) {
		DRM_ERROR("amdgpu: IB test timed out.\n");
		r = -ETIMEDOUT;
	} else if (r < 0) {
		DRM_ERROR("amdgpu: fence wait failed (%ld).\n", r);
	} else {
		DRM_DEBUG("ib test on ring %d succeeded\n", ring->idx);
		r = 0;
	}
error:
	dma_fence_put(fence);
	return r;
}
