/*
 * Copyright 2008 Jerome Glisse.
 * 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
 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 * Authors:
 *    Jerome Glisse <glisse@freedesktop.org>
 */

#include <linux/list_sort.h>
#include <linux/pci.h>
#include <linux/uaccess.h>

#include <drm/drm_device.h>
#include <drm/drm_file.h>
#include <drm/radeon_drm.h>

#include "radeon.h"
#include "radeon_reg.h"
#include "radeon_trace.h"

#define RADEON_CS_MAX_PRIORITY          32u
#define RADEON_CS_NUM_BUCKETS           (RADEON_CS_MAX_PRIORITY + 1)

/* This is based on the bucket sort with O(n) time complexity.
 * An item with priority "i" is added to bucket[i]. The lists are then
 * concatenated in descending order.
 */
struct radeon_cs_buckets {
        struct list_head bucket[RADEON_CS_NUM_BUCKETS];
};

static void radeon_cs_buckets_init(struct radeon_cs_buckets *b)
{
        unsigned i;

        for (i = 0; i < RADEON_CS_NUM_BUCKETS; i++)
                INIT_LIST_HEAD(&b->bucket[i]);
}

static void radeon_cs_buckets_add(struct radeon_cs_buckets *b,
                                  struct list_head *item, unsigned priority)
{
        /* Since buffers which appear sooner in the relocation list are
         * likely to be used more often than buffers which appear later
         * in the list, the sort mustn't change the ordering of buffers
         * with the same priority, i.e. it must be stable.
         */
        list_add_tail(item, &b->bucket[min(priority, RADEON_CS_MAX_PRIORITY)]);
}

static void radeon_cs_buckets_get_list(struct radeon_cs_buckets *b,
                                       struct list_head *out_list)
{
        unsigned i;

        /* Connect the sorted buckets in the output list. */
        for (i = 0; i < RADEON_CS_NUM_BUCKETS; i++) {
                list_splice(&b->bucket[i], out_list);
        }
}

static int radeon_cs_parser_relocs(struct radeon_cs_parser *p)
{
        struct radeon_cs_chunk *chunk;
        struct radeon_cs_buckets buckets;
        unsigned i;
        bool need_mmap_lock = false;
        int r;

        if (p->chunk_relocs == NULL) {
                return 0;
        }
        chunk = p->chunk_relocs;
        p->dma_reloc_idx = 0;
        /* FIXME: we assume that each relocs use 4 dwords */
        p->nrelocs = chunk->length_dw / 4;
        p->relocs = kvmalloc_array(p->nrelocs, sizeof(struct radeon_bo_list),
                        GFP_KERNEL | __GFP_ZERO);
        if (p->relocs == NULL) {
                return -ENOMEM;
        }

        radeon_cs_buckets_init(&buckets);

        for (i = 0; i < p->nrelocs; i++) {
                struct drm_radeon_cs_reloc *r;
                struct drm_gem_object *gobj;
                unsigned priority;

                r = (struct drm_radeon_cs_reloc *)&chunk->kdata[i*4];
                gobj = drm_gem_object_lookup(p->filp, r->handle);
                if (gobj == NULL) {
                        DRM_ERROR("gem object lookup failed 0x%x\n",
                                  r->handle);
                        return -ENOENT;
                }
                p->relocs[i].robj = gem_to_radeon_bo(gobj);

                /* The userspace buffer priorities are from 0 to 15. A higher
                 * number means the buffer is more important.
                 * Also, the buffers used for write have a higher priority than
                 * the buffers used for read only, which doubles the range
                 * to 0 to 31. 32 is reserved for the kernel driver.
                 */
                priority = (r->flags & RADEON_RELOC_PRIO_MASK) * 2
                           + !!r->write_domain;

                /* The first reloc of an UVD job is the msg and that must be in
                 * VRAM, the second reloc is the DPB and for WMV that must be in
                 * VRAM as well. Also put everything into VRAM on AGP cards and older
                 * IGP chips to avoid image corruptions
                 */
                if (p->ring == R600_RING_TYPE_UVD_INDEX &&
                    (i <= 0 || pci_find_capability(p->rdev->pdev, PCI_CAP_ID_AGP) ||
                     p->rdev->family == CHIP_RS780 ||
                     p->rdev->family == CHIP_RS880)) {

                        /* TODO: is this still needed for NI+ ? */
                        p->relocs[i].preferred_domains =
                                RADEON_GEM_DOMAIN_VRAM;

                        p->relocs[i].allowed_domains =
                                RADEON_GEM_DOMAIN_VRAM;

                        /* prioritize this over any other relocation */
                        priority = RADEON_CS_MAX_PRIORITY;
                } else {
                        uint32_t domain = r->write_domain ?
                                r->write_domain : r->read_domains;

                        if (domain & RADEON_GEM_DOMAIN_CPU) {
                                DRM_ERROR("RADEON_GEM_DOMAIN_CPU is not valid "
                                          "for command submission\n");
                                return -EINVAL;
                        }

                        p->relocs[i].preferred_domains = domain;
                        if (domain == RADEON_GEM_DOMAIN_VRAM)
                                domain |= RADEON_GEM_DOMAIN_GTT;
                        p->relocs[i].allowed_domains = domain;
                }

                if (radeon_ttm_tt_has_userptr(p->rdev, p->relocs[i].robj->tbo.ttm)) {
                        uint32_t domain = p->relocs[i].preferred_domains;
                        if (!(domain & RADEON_GEM_DOMAIN_GTT)) {
                                DRM_ERROR("Only RADEON_GEM_DOMAIN_GTT is "
                                          "allowed for userptr BOs\n");
                                return -EINVAL;
                        }
                        need_mmap_lock = true;
                        domain = RADEON_GEM_DOMAIN_GTT;
                        p->relocs[i].preferred_domains = domain;
                        p->relocs[i].allowed_domains = domain;
                }

                /* Objects shared as dma-bufs cannot be moved to VRAM */
                if (p->relocs[i].robj->prime_shared_count) {
                        p->relocs[i].allowed_domains &= ~RADEON_GEM_DOMAIN_VRAM;
                        if (!p->relocs[i].allowed_domains) {
                                DRM_ERROR("BO associated with dma-buf cannot "
                                          "be moved to VRAM\n");
                                return -EINVAL;
                        }
                }

                p->relocs[i].tv.bo = &p->relocs[i].robj->tbo;
                p->relocs[i].tv.num_shared = !r->write_domain;

                radeon_cs_buckets_add(&buckets, &p->relocs[i].tv.head,
                                      priority);
        }

        radeon_cs_buckets_get_list(&buckets, &p->validated);

        if (p->cs_flags & RADEON_CS_USE_VM)
                p->vm_bos = radeon_vm_get_bos(p->rdev, p->ib.vm,
                                              &p->validated);
        if (need_mmap_lock)
                mmap_read_lock(current->mm);

        r = radeon_bo_list_validate(p->rdev, &p->ticket, &p->validated, p->ring);

        if (need_mmap_lock)
                mmap_read_unlock(current->mm);

        return r;
}

static int radeon_cs_get_ring(struct radeon_cs_parser *p, u32 ring, s32 priority)
{
        p->priority = priority;

        switch (ring) {
        default:
                DRM_ERROR("unknown ring id: %d\n", ring);
                return -EINVAL;
        case RADEON_CS_RING_GFX:
                p->ring = RADEON_RING_TYPE_GFX_INDEX;
                break;
        case RADEON_CS_RING_COMPUTE:
                if (p->rdev->family >= CHIP_TAHITI) {
                        if (p->priority > 0)
                                p->ring = CAYMAN_RING_TYPE_CP1_INDEX;
                        else
                                p->ring = CAYMAN_RING_TYPE_CP2_INDEX;
                } else
                        p->ring = RADEON_RING_TYPE_GFX_INDEX;
                break;
        case RADEON_CS_RING_DMA:
                if (p->rdev->family >= CHIP_CAYMAN) {
                        if (p->priority > 0)
                                p->ring = R600_RING_TYPE_DMA_INDEX;
                        else
                                p->ring = CAYMAN_RING_TYPE_DMA1_INDEX;
                } else if (p->rdev->family >= CHIP_RV770) {
                        p->ring = R600_RING_TYPE_DMA_INDEX;
                } else {
                        return -EINVAL;
                }
                break;
        case RADEON_CS_RING_UVD:
                p->ring = R600_RING_TYPE_UVD_INDEX;
                break;
        case RADEON_CS_RING_VCE:
                /* TODO: only use the low priority ring for now */
                p->ring = TN_RING_TYPE_VCE1_INDEX;
                break;
        }
        return 0;
}

static int radeon_cs_sync_rings(struct radeon_cs_parser *p)
{
        struct radeon_bo_list *reloc;
        int r;

        list_for_each_entry(reloc, &p->validated, tv.head) {
                struct dma_resv *resv;

                resv = reloc->robj->tbo.base.resv;
                r = radeon_sync_resv(p->rdev, &p->ib.sync, resv,
                                     reloc->tv.num_shared);
                if (r)
                        return r;
        }
        return 0;
}

/* XXX: note that this is called from the legacy UMS CS ioctl as well */
int radeon_cs_parser_init(struct radeon_cs_parser *p, void *data)
{
        struct drm_radeon_cs *cs = data;
        uint64_t *chunk_array_ptr;
        unsigned size, i;
        u32 ring = RADEON_CS_RING_GFX;
        s32 priority = 0;

        INIT_LIST_HEAD(&p->validated);

        if (!cs->num_chunks) {
                return 0;
        }

        /* get chunks */
        p->idx = 0;
        p->ib.sa_bo = NULL;
        p->const_ib.sa_bo = NULL;
        p->chunk_ib = NULL;
        p->chunk_relocs = NULL;
        p->chunk_flags = NULL;
        p->chunk_const_ib = NULL;
        p->chunks_array = kcalloc(cs->num_chunks, sizeof(uint64_t), GFP_KERNEL);
        if (p->chunks_array == NULL) {
                return -ENOMEM;
        }
        chunk_array_ptr = (uint64_t *)(unsigned long)(cs->chunks);
        if (copy_from_user(p->chunks_array, chunk_array_ptr,
                               sizeof(uint64_t)*cs->num_chunks)) {
                return -EFAULT;
        }
        p->cs_flags = 0;
        p->nchunks = cs->num_chunks;
        p->chunks = kcalloc(p->nchunks, sizeof(struct radeon_cs_chunk), GFP_KERNEL);
        if (p->chunks == NULL) {
                return -ENOMEM;
        }
        for (i = 0; i < p->nchunks; i++) {
                struct drm_radeon_cs_chunk __user **chunk_ptr = NULL;
                struct drm_radeon_cs_chunk user_chunk;
                uint32_t __user *cdata;

                chunk_ptr = (void __user*)(unsigned long)p->chunks_array[i];
                if (copy_from_user(&user_chunk, chunk_ptr,
                                       sizeof(struct drm_radeon_cs_chunk))) {
                        return -EFAULT;
                }
                p->chunks[i].length_dw = user_chunk.length_dw;
                if (user_chunk.chunk_id == RADEON_CHUNK_ID_RELOCS) {
                        p->chunk_relocs = &p->chunks[i];
                }
                if (user_chunk.chunk_id == RADEON_CHUNK_ID_IB) {
                        p->chunk_ib = &p->chunks[i];
                        /* zero length IB isn't useful */
                        if (p->chunks[i].length_dw == 0)
                                return -EINVAL;
                }
                if (user_chunk.chunk_id == RADEON_CHUNK_ID_CONST_IB) {
                        p->chunk_const_ib = &p->chunks[i];
                        /* zero length CONST IB isn't useful */
                        if (p->chunks[i].length_dw == 0)
                                return -EINVAL;
                }
                if (user_chunk.chunk_id == RADEON_CHUNK_ID_FLAGS) {
                        p->chunk_flags = &p->chunks[i];
                        /* zero length flags aren't useful */
                        if (p->chunks[i].length_dw == 0)
                                return -EINVAL;
                }

                size = p->chunks[i].length_dw;
                cdata = (void __user *)(unsigned long)user_chunk.chunk_data;
                p->chunks[i].user_ptr = cdata;
                if (user_chunk.chunk_id == RADEON_CHUNK_ID_CONST_IB)
                        continue;

                if (user_chunk.chunk_id == RADEON_CHUNK_ID_IB) {
                        if (!p->rdev || !(p->rdev->flags & RADEON_IS_AGP))
                                continue;
                }

                p->chunks[i].kdata = kvmalloc_array(size, sizeof(uint32_t), GFP_KERNEL);
                size *= sizeof(uint32_t);
                if (p->chunks[i].kdata == NULL) {
                        return -ENOMEM;
                }
                if (copy_from_user(p->chunks[i].kdata, cdata, size)) {
                        return -EFAULT;
                }
                if (user_chunk.chunk_id == RADEON_CHUNK_ID_FLAGS) {
                        p->cs_flags = p->chunks[i].kdata[0];
                        if (p->chunks[i].length_dw > 1)
                                ring = p->chunks[i].kdata[1];
                        if (p->chunks[i].length_dw > 2)
                                priority = (s32)p->chunks[i].kdata[2];
                }
        }

        /* these are KMS only */
        if (p->rdev) {
                if ((p->cs_flags & RADEON_CS_USE_VM) &&
                    !p->rdev->vm_manager.enabled) {
                        DRM_ERROR("VM not active on asic!\n");
                        return -EINVAL;
                }

                if (radeon_cs_get_ring(p, ring, priority))
                        return -EINVAL;

                /* we only support VM on some SI+ rings */
                if ((p->cs_flags & RADEON_CS_USE_VM) == 0) {
                        if (p->rdev->asic->ring[p->ring]->cs_parse == NULL) {
                                DRM_ERROR("Ring %d requires VM!\n", p->ring);
                                return -EINVAL;
                        }
                } else {
                        if (p->rdev->asic->ring[p->ring]->ib_parse == NULL) {
                                DRM_ERROR("VM not supported on ring %d!\n",
                                          p->ring);
                                return -EINVAL;
                        }
                }
        }

        return 0;
}

static int cmp_size_smaller_first(void *priv, struct list_head *a,
                                  struct list_head *b)
{
        struct radeon_bo_list *la = list_entry(a, struct radeon_bo_list, tv.head);
        struct radeon_bo_list *lb = list_entry(b, struct radeon_bo_list, tv.head);

        /* Sort A before B if A is smaller. */
        return (int)la->robj->tbo.mem.num_pages -
                (int)lb->robj->tbo.mem.num_pages;
}

/**
 * cs_parser_fini() - clean parser states
 * @parser:     parser structure holding parsing context.
 * @error:      error number
 * @backoff:    indicator to backoff the reservation
 *
 * If error is set than unvalidate buffer, otherwise just free memory
 * used by parsing context.
 **/
static void radeon_cs_parser_fini(struct radeon_cs_parser *parser, int error, bool backoff)
{
        unsigned i;

        if (!error) {
                /* Sort the buffer list from the smallest to largest buffer,
                 * which affects the order of buffers in the LRU list.
                 * This assures that the smallest buffers are added first
                 * to the LRU list, so they are likely to be later evicted
                 * first, instead of large buffers whose eviction is more
                 * expensive.
                 *
                 * This slightly lowers the number of bytes moved by TTM
                 * per frame under memory pressure.
                 */
                list_sort(NULL, &parser->validated, cmp_size_smaller_first);

                ttm_eu_fence_buffer_objects(&parser->ticket,
                                            &parser->validated,
                                            &parser->ib.fence->base);
        } else if (backoff) {
                ttm_eu_backoff_reservation(&parser->ticket,
                                           &parser->validated);
        }

        if (parser->relocs != NULL) {
                for (i = 0; i < parser->nrelocs; i++) {
                        struct radeon_bo *bo = parser->relocs[i].robj;
                        if (bo == NULL)
                                continue;

                        drm_gem_object_put(&bo->tbo.base);
                }
        }
        kfree(parser->track);
        kvfree(parser->relocs);
        kvfree(parser->vm_bos);
        for (i = 0; i < parser->nchunks; i++)
                kvfree(parser->chunks[i].kdata);
        kfree(parser->chunks);
        kfree(parser->chunks_array);
        radeon_ib_free(parser->rdev, &parser->ib);
        radeon_ib_free(parser->rdev, &parser->const_ib);
}

static int radeon_cs_ib_chunk(struct radeon_device *rdev,
                              struct radeon_cs_parser *parser)
{
        int r;

        if (parser->chunk_ib == NULL)
                return 0;

        if (parser->cs_flags & RADEON_CS_USE_VM)
                return 0;

        r = radeon_cs_parse(rdev, parser->ring, parser);
        if (r || parser->parser_error) {
                DRM_ERROR("Invalid command stream !\n");
                return r;
        }

        r = radeon_cs_sync_rings(parser);
        if (r) {
                if (r != -ERESTARTSYS)
                        DRM_ERROR("Failed to sync rings: %i\n", r);
                return r;
        }

        if (parser->ring == R600_RING_TYPE_UVD_INDEX)
                radeon_uvd_note_usage(rdev);
        else if ((parser->ring == TN_RING_TYPE_VCE1_INDEX) ||
                 (parser->ring == TN_RING_TYPE_VCE2_INDEX))
                radeon_vce_note_usage(rdev);

        r = radeon_ib_schedule(rdev, &parser->ib, NULL, true);
        if (r) {
                DRM_ERROR("Failed to schedule IB !\n");
        }
        return r;
}

static int radeon_bo_vm_update_pte(struct radeon_cs_parser *p,
                                   struct radeon_vm *vm)
{
        struct radeon_device *rdev = p->rdev;
        struct radeon_bo_va *bo_va;
        int i, r;

        r = radeon_vm_update_page_directory(rdev, vm);
        if (r)
                return r;

        r = radeon_vm_clear_freed(rdev, vm);
        if (r)
                return r;

        if (vm->ib_bo_va == NULL) {
                DRM_ERROR("Tmp BO not in VM!\n");
                return -EINVAL;
        }

        r = radeon_vm_bo_update(rdev, vm->ib_bo_va,
                                &rdev->ring_tmp_bo.bo->tbo.mem);
        if (r)
                return r;

        for (i = 0; i < p->nrelocs; i++) {
                struct radeon_bo *bo;

                bo = p->relocs[i].robj;
                bo_va = radeon_vm_bo_find(vm, bo);
                if (bo_va == NULL) {
                        dev_err(rdev->dev, "bo %p not in vm %p\n", bo, vm);
                        return -EINVAL;
                }

                r = radeon_vm_bo_update(rdev, bo_va, &bo->tbo.mem);
                if (r)
                        return r;

                radeon_sync_fence(&p->ib.sync, bo_va->last_pt_update);
        }

        return radeon_vm_clear_invalids(rdev, vm);
}

static int radeon_cs_ib_vm_chunk(struct radeon_device *rdev,
                                 struct radeon_cs_parser *parser)
{
        struct radeon_fpriv *fpriv = parser->filp->driver_priv;
        struct radeon_vm *vm = &fpriv->vm;
        int r;

        if (parser->chunk_ib == NULL)
                return 0;
        if ((parser->cs_flags & RADEON_CS_USE_VM) == 0)
                return 0;

        if (parser->const_ib.length_dw) {
                r = radeon_ring_ib_parse(rdev, parser->ring, &parser->const_ib);
                if (r) {
                        return r;
                }
        }

        r = radeon_ring_ib_parse(rdev, parser->ring, &parser->ib);
        if (r) {
                return r;
        }

        if (parser->ring == R600_RING_TYPE_UVD_INDEX)
                radeon_uvd_note_usage(rdev);

        mutex_lock(&vm->mutex);
        r = radeon_bo_vm_update_pte(parser, vm);
        if (r) {
                goto out;
        }

        r = radeon_cs_sync_rings(parser);
        if (r) {
                if (r != -ERESTARTSYS)
                        DRM_ERROR("Failed to sync rings: %i\n", r);
                goto out;
        }

        if ((rdev->family >= CHIP_TAHITI) &&
            (parser->chunk_const_ib != NULL)) {
                r = radeon_ib_schedule(rdev, &parser->ib, &parser->const_ib, true);
        } else {
                r = radeon_ib_schedule(rdev, &parser->ib, NULL, true);
        }

out:
        mutex_unlock(&vm->mutex);
        return r;
}

static int radeon_cs_handle_lockup(struct radeon_device *rdev, int r)
{
        if (r == -EDEADLK) {
                r = radeon_gpu_reset(rdev);
                if (!r)
                        r = -EAGAIN;
        }
        return r;
}

static int radeon_cs_ib_fill(struct radeon_device *rdev, struct radeon_cs_parser *parser)
{
        struct radeon_cs_chunk *ib_chunk;
        struct radeon_vm *vm = NULL;
        int r;

        if (parser->chunk_ib == NULL)
                return 0;

        if (parser->cs_flags & RADEON_CS_USE_VM) {
                struct radeon_fpriv *fpriv = parser->filp->driver_priv;
                vm = &fpriv->vm;

                if ((rdev->family >= CHIP_TAHITI) &&
                    (parser->chunk_const_ib != NULL)) {
                        ib_chunk = parser->chunk_const_ib;
                        if (ib_chunk->length_dw > RADEON_IB_VM_MAX_SIZE) {
                                DRM_ERROR("cs IB CONST too big: %d\n", ib_chunk->length_dw);
                                return -EINVAL;
                        }
                        r =  radeon_ib_get(rdev, parser->ring, &parser->const_ib,
                                           vm, ib_chunk->length_dw * 4);
                        if (r) {
                                DRM_ERROR("Failed to get const ib !\n");
                                return r;
                        }
                        parser->const_ib.is_const_ib = true;
                        parser->const_ib.length_dw = ib_chunk->length_dw;
                        if (copy_from_user(parser->const_ib.ptr,
                                               ib_chunk->user_ptr,
                                               ib_chunk->length_dw * 4))
                                return -EFAULT;
                }

                ib_chunk = parser->chunk_ib;
                if (ib_chunk->length_dw > RADEON_IB_VM_MAX_SIZE) {
                        DRM_ERROR("cs IB too big: %d\n", ib_chunk->length_dw);
                        return -EINVAL;
                }
        }
        ib_chunk = parser->chunk_ib;

        r =  radeon_ib_get(rdev, parser->ring, &parser->ib,
                           vm, ib_chunk->length_dw * 4);
        if (r) {
                DRM_ERROR("Failed to get ib !\n");
                return r;
        }
        parser->ib.length_dw = ib_chunk->length_dw;
        if (ib_chunk->kdata)
                memcpy(parser->ib.ptr, ib_chunk->kdata, ib_chunk->length_dw * 4);
        else if (copy_from_user(parser->ib.ptr, ib_chunk->user_ptr, ib_chunk->length_dw * 4))
                return -EFAULT;
        return 0;
}

int radeon_cs_ioctl(struct drm_device *dev, void *data, struct drm_file *filp)
{
        struct radeon_device *rdev = dev->dev_private;
        struct radeon_cs_parser parser;
        int r;

        down_read(&rdev->exclusive_lock);
        if (!rdev->accel_working) {
                up_read(&rdev->exclusive_lock);
                return -EBUSY;
        }
        if (rdev->in_reset) {
                up_read(&rdev->exclusive_lock);
                r = radeon_gpu_reset(rdev);
                if (!r)
                        r = -EAGAIN;
                return r;
        }
        /* initialize parser */
        memset(&parser, 0, sizeof(struct radeon_cs_parser));
        parser.filp = filp;
        parser.rdev = rdev;
        parser.dev = rdev->dev;
        parser.family = rdev->family;
        r = radeon_cs_parser_init(&parser, data);
        if (r) {
                DRM_ERROR("Failed to initialize parser !\n");
                radeon_cs_parser_fini(&parser, r, false);
                up_read(&rdev->exclusive_lock);
                r = radeon_cs_handle_lockup(rdev, r);
                return r;
        }

        r = radeon_cs_ib_fill(rdev, &parser);
        if (!r) {
                r = radeon_cs_parser_relocs(&parser);
                if (r && r != -ERESTARTSYS)
                        DRM_ERROR("Failed to parse relocation %d!\n", r);
        }

        if (r) {
                radeon_cs_parser_fini(&parser, r, false);
                up_read(&rdev->exclusive_lock);
                r = radeon_cs_handle_lockup(rdev, r);
                return r;
        }

        trace_radeon_cs(&parser);

        r = radeon_cs_ib_chunk(rdev, &parser);
        if (r) {
                goto out;
        }
        r = radeon_cs_ib_vm_chunk(rdev, &parser);
        if (r) {
                goto out;
        }
out:
        radeon_cs_parser_fini(&parser, r, true);
        up_read(&rdev->exclusive_lock);
        r = radeon_cs_handle_lockup(rdev, r);
        return r;
}

/**
 * radeon_cs_packet_parse() - parse cp packet and point ib index to next packet
 * @p:          parser structure holding parsing context.
 * @pkt:        where to store packet information
 * @idx:        packet index
 *
 * Assume that chunk_ib_index is properly set. Will return -EINVAL
 * if packet is bigger than remaining ib size. or if packets is unknown.
 **/
int radeon_cs_packet_parse(struct radeon_cs_parser *p,
                           struct radeon_cs_packet *pkt,
                           unsigned idx)
{
        struct radeon_cs_chunk *ib_chunk = p->chunk_ib;
        struct radeon_device *rdev = p->rdev;
        uint32_t header;
        int ret = 0, i;

        if (idx >= ib_chunk->length_dw) {
                DRM_ERROR("Can not parse packet at %d after CS end %d !\n",
                          idx, ib_chunk->length_dw);
                return -EINVAL;
        }
        header = radeon_get_ib_value(p, idx);
        pkt->idx = idx;
        pkt->type = RADEON_CP_PACKET_GET_TYPE(header);
        pkt->count = RADEON_CP_PACKET_GET_COUNT(header);
        pkt->one_reg_wr = 0;
        switch (pkt->type) {
        case RADEON_PACKET_TYPE0:
                if (rdev->family < CHIP_R600) {
                        pkt->reg = R100_CP_PACKET0_GET_REG(header);
                        pkt->one_reg_wr =
                                RADEON_CP_PACKET0_GET_ONE_REG_WR(header);
                } else
                        pkt->reg = R600_CP_PACKET0_GET_REG(header);
                break;
        case RADEON_PACKET_TYPE3:
                pkt->opcode = RADEON_CP_PACKET3_GET_OPCODE(header);
                break;
        case RADEON_PACKET_TYPE2:
                pkt->count = -1;
                break;
        default:
                DRM_ERROR("Unknown packet type %d at %d !\n", pkt->type, idx);
                ret = -EINVAL;
                goto dump_ib;
        }
        if ((pkt->count + 1 + pkt->idx) >= ib_chunk->length_dw) {
                DRM_ERROR("Packet (%d:%d:%d) end after CS buffer (%d) !\n",
                          pkt->idx, pkt->type, pkt->count, ib_chunk->length_dw);
                ret = -EINVAL;
                goto dump_ib;
        }
        return 0;

dump_ib:
        for (i = 0; i < ib_chunk->length_dw; i++) {
                if (i == idx)
                        printk("\t0x%08x <---\n", radeon_get_ib_value(p, i));
                else
                        printk("\t0x%08x\n", radeon_get_ib_value(p, i));
        }
        return ret;
}

/**
 * radeon_cs_packet_next_is_pkt3_nop() - test if the next packet is P3 NOP
 * @p:          structure holding the parser context.
 *
 * Check if the next packet is NOP relocation packet3.
 **/
bool radeon_cs_packet_next_is_pkt3_nop(struct radeon_cs_parser *p)
{
        struct radeon_cs_packet p3reloc;
        int r;

        r = radeon_cs_packet_parse(p, &p3reloc, p->idx);
        if (r)
                return false;
        if (p3reloc.type != RADEON_PACKET_TYPE3)
                return false;
        if (p3reloc.opcode != RADEON_PACKET3_NOP)
                return false;
        return true;
}

/**
 * radeon_cs_dump_packet() - dump raw packet context
 * @p:          structure holding the parser context.
 * @pkt:        structure holding the packet.
 *
 * Used mostly for debugging and error reporting.
 **/
void radeon_cs_dump_packet(struct radeon_cs_parser *p,
                           struct radeon_cs_packet *pkt)
{
        volatile uint32_t *ib;
        unsigned i;
        unsigned idx;

        ib = p->ib.ptr;
        idx = pkt->idx;
        for (i = 0; i <= (pkt->count + 1); i++, idx++)
                DRM_INFO("ib[%d]=0x%08X\n", idx, ib[idx]);
}

/**
 * radeon_cs_packet_next_reloc() - parse next (should be reloc) packet
 * @p:                  parser structure holding parsing context.
 * @cs_reloc:           reloc informations
 * @nomm:               no memory management for debugging
 *
 * Check if next packet is relocation packet3, do bo validation and compute
 * GPU offset using the provided start.
 **/
int radeon_cs_packet_next_reloc(struct radeon_cs_parser *p,
                                struct radeon_bo_list **cs_reloc,
                                int nomm)
{
        struct radeon_cs_chunk *relocs_chunk;
        struct radeon_cs_packet p3reloc;
        unsigned idx;
        int r;

        if (p->chunk_relocs == NULL) {
                DRM_ERROR("No relocation chunk !\n");
                return -EINVAL;
        }
        *cs_reloc = NULL;
        relocs_chunk = p->chunk_relocs;
        r = radeon_cs_packet_parse(p, &p3reloc, p->idx);
        if (r)
                return r;
        p->idx += p3reloc.count + 2;
        if (p3reloc.type != RADEON_PACKET_TYPE3 ||
            p3reloc.opcode != RADEON_PACKET3_NOP) {
                DRM_ERROR("No packet3 for relocation for packet at %d.\n",
                          p3reloc.idx);
                radeon_cs_dump_packet(p, &p3reloc);
                return -EINVAL;
        }
        idx = radeon_get_ib_value(p, p3reloc.idx + 1);
        if (idx >= relocs_chunk->length_dw) {
                DRM_ERROR("Relocs at %d after relocations chunk end %d !\n",
                          idx, relocs_chunk->length_dw);
                radeon_cs_dump_packet(p, &p3reloc);
                return -EINVAL;
        }
        /* FIXME: we assume reloc size is 4 dwords */
        if (nomm) {
                *cs_reloc = p->relocs;
                (*cs_reloc)->gpu_offset =
                        (u64)relocs_chunk->kdata[idx + 3] << 32;
                (*cs_reloc)->gpu_offset |= relocs_chunk->kdata[idx + 0];
        } else
                *cs_reloc = &p->relocs[(idx / 4)];
        return 0;
}