radeon_cs.c

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/*
 * 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 <[email protected]>
 */
#include <drm/drmP.h>
#include <drm/radeon_drm.h>
#include "radeon_reg.h"
#include "radeon.h"

void r100_cs_dump_packet(struct radeon_cs_parser *p,
             struct radeon_cs_packet *pkt);

static int radeon_cs_parser_relocs(struct radeon_cs_parser *p)
{
    struct drm_device *ddev = p->rdev->ddev;
    struct radeon_cs_chunk *chunk;
    unsigned i, j;
    bool duplicate;

    if (p->chunk_relocs_idx == -1) {
        return 0;
    }
    chunk = &p->chunks[p->chunk_relocs_idx];
    /* FIXME: we assume that each relocs use 4 dwords */
    p->nrelocs = chunk->length_dw / 4;
    p->relocs_ptr = kcalloc(p->nrelocs, sizeof(void *), GFP_KERNEL);
    if (p->relocs_ptr == NULL) {
        return -ENOMEM;
    }
    p->relocs = kcalloc(p->nrelocs, sizeof(struct radeon_cs_reloc), GFP_KERNEL);
    if (p->relocs == NULL) {
        return -ENOMEM;
    }
    for (i = 0; i < p->nrelocs; i++) {
        struct drm_radeon_cs_reloc *r;

        duplicate = false;
        r = (struct drm_radeon_cs_reloc *)&chunk->kdata[i*4];
        for (j = 0; j < i; j++) {
            if (r->handle == p->relocs[j].handle) {
                p->relocs_ptr[i] = &p->relocs[j];
                duplicate = true;
                break;
            }
        }
        if (!duplicate) {
            p->relocs[i].gobj = drm_gem_object_lookup(ddev,
                                  p->filp,
                                  r->handle);
            if (p->relocs[i].gobj == NULL) {
                DRM_ERROR("gem object lookup failed 0x%x\n",
                      r->handle);
                return -ENOENT;
            }
            p->relocs_ptr[i] = &p->relocs[i];
            p->relocs[i].robj = gem_to_radeon_bo(p->relocs[i].gobj);
            p->relocs[i].lobj.bo = p->relocs[i].robj;
            p->relocs[i].lobj.wdomain = r->write_domain;
            p->relocs[i].lobj.rdomain = r->read_domains;
            p->relocs[i].lobj.tv.bo = &p->relocs[i].robj->tbo;
            p->relocs[i].handle = r->handle;
            p->relocs[i].flags = r->flags;
            radeon_bo_list_add_object(&p->relocs[i].lobj,
                          &p->validated);

        } else
            p->relocs[i].handle = 0;
    }
    return radeon_bo_list_validate(&p->validated);
}

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;
    }
    return 0;
}

static void radeon_cs_sync_to(struct radeon_cs_parser *p,
                  struct radeon_fence *fence)
{
    struct radeon_fence *other;

    if (!fence)
        return;

    other = p->ib.sync_to[fence->ring];
    p->ib.sync_to[fence->ring] = radeon_fence_later(fence, other);
}

static void radeon_cs_sync_rings(struct radeon_cs_parser *p)
{
    int i;

    for (i = 0; i < p->nrelocs; i++) {
        if (!p->relocs[i].robj)
            continue;

        radeon_cs_sync_to(p, p->relocs[i].robj->tbo.sync_obj);
    }
}

/* 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;

    if (!cs->num_chunks) {
        return 0;
    }
    /* get chunks */
    INIT_LIST_HEAD(&p->validated);
    p->idx = 0;
    p->ib.sa_bo = NULL;
    p->ib.semaphore = NULL;
    p->const_ib.sa_bo = NULL;
    p->const_ib.semaphore = NULL;
    p->chunk_ib_idx = -1;
    p->chunk_relocs_idx = -1;
    p->chunk_flags_idx = -1;
    p->chunk_const_ib_idx = -1;
    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 (DRM_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 (DRM_COPY_FROM_USER(&user_chunk, chunk_ptr,
                       sizeof(struct drm_radeon_cs_chunk))) {
            return -EFAULT;
        }
        p->chunks[i].length_dw = user_chunk.length_dw;
        p->chunks[i].kdata = NULL;
        p->chunks[i].chunk_id = user_chunk.chunk_id;

        if (p->chunks[i].chunk_id == RADEON_CHUNK_ID_RELOCS) {
            p->chunk_relocs_idx = i;
        }
        if (p->chunks[i].chunk_id == RADEON_CHUNK_ID_IB) {
            p->chunk_ib_idx = i;
            /* zero length IB isn't useful */
            if (p->chunks[i].length_dw == 0)
                return -EINVAL;
        }
        if (p->chunks[i].chunk_id == RADEON_CHUNK_ID_CONST_IB) {
            p->chunk_const_ib_idx = i;
            /* zero length CONST IB isn't useful */
            if (p->chunks[i].length_dw == 0)
                return -EINVAL;
        }
        if (p->chunks[i].chunk_id == RADEON_CHUNK_ID_FLAGS) {
            p->chunk_flags_idx = i;
            /* zero length flags aren't useful */
            if (p->chunks[i].length_dw == 0)
                return -EINVAL;
        }

        p->chunks[i].length_dw = user_chunk.length_dw;
        p->chunks[i].user_ptr = (void __user *)(unsigned long)user_chunk.chunk_data;

        cdata = (uint32_t *)(unsigned long)user_chunk.chunk_data;
        if ((p->chunks[i].chunk_id == RADEON_CHUNK_ID_RELOCS) ||
            (p->chunks[i].chunk_id == RADEON_CHUNK_ID_FLAGS)) {
            size = p->chunks[i].length_dw * sizeof(uint32_t);
            p->chunks[i].kdata = kmalloc(size, GFP_KERNEL);
            if (p->chunks[i].kdata == NULL) {
                return -ENOMEM;
            }
            if (DRM_COPY_FROM_USER(p->chunks[i].kdata,
                           p->chunks[i].user_ptr, size)) {
                return -EFAULT;
            }
            if (p->chunks[i].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;
        }

        /* we only support VM on SI+ */
        if ((p->rdev->family >= CHIP_TAHITI) &&
            ((p->cs_flags & RADEON_CS_USE_VM) == 0)) {
            DRM_ERROR("VM required on SI+!\n");
            return -EINVAL;
        }

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

    /* deal with non-vm */
    if ((p->chunk_ib_idx != -1) &&
        ((p->cs_flags & RADEON_CS_USE_VM) == 0) &&
        (p->chunks[p->chunk_ib_idx].chunk_id == RADEON_CHUNK_ID_IB)) {
        if (p->chunks[p->chunk_ib_idx].length_dw > (16 * 1024)) {
            DRM_ERROR("cs IB too big: %d\n",
                  p->chunks[p->chunk_ib_idx].length_dw);
            return -EINVAL;
        }
        if ((p->rdev->flags & RADEON_IS_AGP)) {
            p->chunks[p->chunk_ib_idx].kpage[0] = kmalloc(PAGE_SIZE, GFP_KERNEL);
            p->chunks[p->chunk_ib_idx].kpage[1] = kmalloc(PAGE_SIZE, GFP_KERNEL);
            if (p->chunks[p->chunk_ib_idx].kpage[0] == NULL ||
                p->chunks[p->chunk_ib_idx].kpage[1] == NULL) {
                kfree(p->chunks[i].kpage[0]);
                kfree(p->chunks[i].kpage[1]);
                return -ENOMEM;
            }
        }
        p->chunks[p->chunk_ib_idx].kpage_idx[0] = -1;
        p->chunks[p->chunk_ib_idx].kpage_idx[1] = -1;
        p->chunks[p->chunk_ib_idx].last_copied_page = -1;
        p->chunks[p->chunk_ib_idx].last_page_index =
            ((p->chunks[p->chunk_ib_idx].length_dw * 4) - 1) / PAGE_SIZE;
    }

    return 0;
}

static void radeon_cs_parser_fini(struct radeon_cs_parser *parser, int error)
{
    unsigned i;

    if (!error) {
        ttm_eu_fence_buffer_objects(&parser->validated,
                        parser->ib.fence);
    } else {
        ttm_eu_backoff_reservation(&parser->validated);
    }

    if (parser->relocs != NULL) {
        for (i = 0; i < parser->nrelocs; i++) {
            if (parser->relocs[i].gobj)
                drm_gem_object_unreference_unlocked(parser->relocs[i].gobj);
        }
    }
    kfree(parser->track);
    kfree(parser->relocs);
    kfree(parser->relocs_ptr);
    for (i = 0; i < parser->nchunks; i++) {
        kfree(parser->chunks[i].kdata);
        if ((parser->rdev->flags & RADEON_IS_AGP)) {
            kfree(parser->chunks[i].kpage[0]);
            kfree(parser->chunks[i].kpage[1]);
        }
    }
    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)
{
    struct radeon_cs_chunk *ib_chunk;
    int r;

    if (parser->chunk_ib_idx == -1)
        return 0;

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

    ib_chunk = &parser->chunks[parser->chunk_ib_idx];
    /* Copy the packet into the IB, the parser will read from the
     * input memory (cached) and write to the IB (which can be
     * uncached).
     */
    r =  radeon_ib_get(rdev, parser->ring, &parser->ib,
               NULL, ib_chunk->length_dw * 4);
    if (r) {
        DRM_ERROR("Failed to get ib !\n");
        return r;
    }
    parser->ib.length_dw = ib_chunk->length_dw;
    r = radeon_cs_parse(rdev, parser->ring, parser);
    if (r || parser->parser_error) {
        DRM_ERROR("Invalid command stream !\n");
        return r;
    }
    r = radeon_cs_finish_pages(parser);
    if (r) {
        DRM_ERROR("Invalid command stream !\n");
        return r;
    }
    radeon_cs_sync_rings(parser);
    r = radeon_ib_schedule(rdev, &parser->ib, NULL);
    if (r) {
        DRM_ERROR("Failed to schedule IB !\n");
    }
    return r;
}

static int radeon_bo_vm_update_pte(struct radeon_cs_parser *parser,
                   struct radeon_vm *vm)
{
    struct radeon_device *rdev = parser->rdev;
    struct radeon_bo_list *lobj;
    struct radeon_bo *bo;
    int r;

    r = radeon_vm_bo_update_pte(rdev, vm, rdev->ring_tmp_bo.bo, &rdev->ring_tmp_bo.bo->tbo.mem);
    if (r) {
        return r;
    }
    list_for_each_entry(lobj, &parser->validated, tv.head) {
        bo = lobj->bo;
        r = radeon_vm_bo_update_pte(parser->rdev, vm, bo, &bo->tbo.mem);
        if (r) {
            return r;
        }
    }
    return 0;
}

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

    if (parser->chunk_ib_idx == -1)
        return 0;
    if ((parser->cs_flags & RADEON_CS_USE_VM) == 0)
        return 0;

    if ((rdev->family >= CHIP_TAHITI) &&
        (parser->chunk_const_ib_idx != -1)) {
        ib_chunk = &parser->chunks[parser->chunk_const_ib_idx];
        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;
        /* Copy the packet into the IB */
        if (DRM_COPY_FROM_USER(parser->const_ib.ptr, ib_chunk->user_ptr,
                       ib_chunk->length_dw * 4)) {
            return -EFAULT;
        }
        r = radeon_ring_ib_parse(rdev, parser->ring, &parser->const_ib);
        if (r) {
            return r;
        }
    }

    ib_chunk = &parser->chunks[parser->chunk_ib_idx];
    if (ib_chunk->length_dw > RADEON_IB_VM_MAX_SIZE) {
        DRM_ERROR("cs IB too big: %d\n", ib_chunk->length_dw);
        return -EINVAL;
    }
    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;
    /* Copy the packet into the IB */
    if (DRM_COPY_FROM_USER(parser->ib.ptr, ib_chunk->user_ptr,
                   ib_chunk->length_dw * 4)) {
        return -EFAULT;
    }
    r = radeon_ring_ib_parse(rdev, parser->ring, &parser->ib);
    if (r) {
        return r;
    }

    mutex_lock(&rdev->vm_manager.lock);
    mutex_lock(&vm->mutex);
    r = radeon_vm_alloc_pt(rdev, vm);
    if (r) {
        goto out;
    }
    r = radeon_bo_vm_update_pte(parser, vm);
    if (r) {
        goto out;
    }
    radeon_cs_sync_rings(parser);
    radeon_cs_sync_to(parser, vm->fence);
    radeon_cs_sync_to(parser, radeon_vm_grab_id(rdev, vm, parser->ring));

    if ((rdev->family >= CHIP_TAHITI) &&
        (parser->chunk_const_ib_idx != -1)) {
        r = radeon_ib_schedule(rdev, &parser->ib, &parser->const_ib);
    } else {
        r = radeon_ib_schedule(rdev, &parser->ib, NULL);
    }

    if (!r) {
        radeon_vm_fence(rdev, vm, parser->ib.fence);
    }

out:
    radeon_vm_add_to_lru(rdev, vm);
    mutex_unlock(&vm->mutex);
    mutex_unlock(&rdev->vm_manager.lock);
    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;
}

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;
    }
    /* 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);
        up_read(&rdev->exclusive_lock);
        r = radeon_cs_handle_lockup(rdev, r);
        return r;
    }
    r = radeon_cs_parser_relocs(&parser);
    if (r) {
        if (r != -ERESTARTSYS)
            DRM_ERROR("Failed to parse relocation %d!\n", r);
        radeon_cs_parser_fini(&parser, r);
        up_read(&rdev->exclusive_lock);
        r = radeon_cs_handle_lockup(rdev, r);
        return r;
    }
    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);
    up_read(&rdev->exclusive_lock);
    r = radeon_cs_handle_lockup(rdev, r);
    return r;
}

int radeon_cs_finish_pages(struct radeon_cs_parser *p)
{
    struct radeon_cs_chunk *ibc = &p->chunks[p->chunk_ib_idx];
    int i;
    int size = PAGE_SIZE;

    for (i = ibc->last_copied_page + 1; i <= ibc->last_page_index; i++) {
        if (i == ibc->last_page_index) {
            size = (ibc->length_dw * 4) % PAGE_SIZE;
            if (size == 0)
                size = PAGE_SIZE;
        }
        
        if (DRM_COPY_FROM_USER(p->ib.ptr + (i * (PAGE_SIZE/4)),
                       ibc->user_ptr + (i * PAGE_SIZE),
                       size))
            return -EFAULT;
    }
    return 0;
}

static int radeon_cs_update_pages(struct radeon_cs_parser *p, int pg_idx)
{
    int new_page;
    struct radeon_cs_chunk *ibc = &p->chunks[p->chunk_ib_idx];
    int i;
    int size = PAGE_SIZE;
    bool copy1 = (p->rdev->flags & RADEON_IS_AGP) ? false : true;

    for (i = ibc->last_copied_page + 1; i < pg_idx; i++) {
        if (DRM_COPY_FROM_USER(p->ib.ptr + (i * (PAGE_SIZE/4)),
                       ibc->user_ptr + (i * PAGE_SIZE),
                       PAGE_SIZE)) {
            p->parser_error = -EFAULT;
            return 0;
        }
    }

    if (pg_idx == ibc->last_page_index) {
        size = (ibc->length_dw * 4) % PAGE_SIZE;
        if (size == 0)
            size = PAGE_SIZE;
    }

    new_page = ibc->kpage_idx[0] < ibc->kpage_idx[1] ? 0 : 1;
    if (copy1)
        ibc->kpage[new_page] = p->ib.ptr + (pg_idx * (PAGE_SIZE / 4));

    if (DRM_COPY_FROM_USER(ibc->kpage[new_page],
                   ibc->user_ptr + (pg_idx * PAGE_SIZE),
                   size)) {
        p->parser_error = -EFAULT;
        return 0;
    }

    /* copy to IB for non single case */
    if (!copy1)
        memcpy((void *)(p->ib.ptr+(pg_idx*(PAGE_SIZE/4))), ibc->kpage[new_page], size);

    ibc->last_copied_page = pg_idx;
    ibc->kpage_idx[new_page] = pg_idx;

    return new_page;
}

u32 radeon_get_ib_value(struct radeon_cs_parser *p, int idx)
{
    struct radeon_cs_chunk *ibc = &p->chunks[p->chunk_ib_idx];
    u32 pg_idx, pg_offset;
    u32 idx_value = 0;
    int new_page;

    pg_idx = (idx * 4) / PAGE_SIZE;
    pg_offset = (idx * 4) % PAGE_SIZE;

    if (ibc->kpage_idx[0] == pg_idx)
        return ibc->kpage[0][pg_offset/4];
    if (ibc->kpage_idx[1] == pg_idx)
        return ibc->kpage[1][pg_offset/4];

    new_page = radeon_cs_update_pages(p, pg_idx);
    if (new_page < 0) {
        p->parser_error = new_page;
        return 0;
    }

    idx_value = ibc->kpage[new_page][pg_offset/4];
    return idx_value;
}