drm/radeon: convert fence to uint64_t v4

[linux-2.6/btrfs-unstable.git] / drivers / gpu / drm / radeon / radeon_ring.c

/*
 * Copyright 2008 Advanced Micro Devices, Inc.
 * Copyright 2008 Red Hat Inc.
 * Copyright 2009 Jerome Glisse.
 *
 * 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 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 COPYRIGHT HOLDER(S) OR AUTHOR(S) 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: Dave Airlie
 *          Alex Deucher
 *          Jerome Glisse
 */
#include <linux/seq_file.h>
#include <linux/slab.h>
#include "drmP.h"
#include "radeon_drm.h"
#include "radeon_reg.h"
#include "radeon.h"
#include "atom.h"

int radeon_debugfs_ib_init(struct radeon_device *rdev);
int radeon_debugfs_ring_init(struct radeon_device *rdev, struct radeon_ring *ring);

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;
}

void radeon_ring_write(struct radeon_ring *ring, uint32_t v)
{
#if DRM_DEBUG_CODE
        if (ring->count_dw <= 0) {
                DRM_ERROR("radeon: writting more dword to ring than expected !\n");
        }
#endif
        ring->ring[ring->wptr++] = v;
        ring->wptr &= ring->ptr_mask;
        ring->count_dw--;
        ring->ring_free_dw--;
}

/*
 * IB.
 */
bool radeon_ib_try_free(struct radeon_device *rdev, struct radeon_ib *ib)
{
        bool done = false;

        /* only free ib which have been emited */
        if (ib->fence && ib->fence->seq < RADEON_FENCE_NOTEMITED_SEQ) {
                if (radeon_fence_signaled(ib->fence)) {
                        radeon_fence_unref(&ib->fence);
                        radeon_sa_bo_free(rdev, &ib->sa_bo);
                        done = true;
                }
        }
        return done;
}

int radeon_ib_get(struct radeon_device *rdev, int ring,
                  struct radeon_ib **ib, unsigned size)
{
        struct radeon_fence *fence;
        unsigned cretry = 0;
        int r = 0, i, idx;

        *ib = NULL;
        /* align size on 256 bytes */
        size = ALIGN(size, 256);

        r = radeon_fence_create(rdev, &fence, ring);
        if (r) {
                dev_err(rdev->dev, "failed to create fence for new IB\n");
                return r;
        }

        radeon_mutex_lock(&rdev->ib_pool.mutex);
        idx = rdev->ib_pool.head_id;
retry:
        if (cretry > 5) {
                dev_err(rdev->dev, "failed to get an ib after 5 retry\n");
                radeon_mutex_unlock(&rdev->ib_pool.mutex);
                radeon_fence_unref(&fence);
                return -ENOMEM;
        }
        cretry++;
        for (i = 0; i < RADEON_IB_POOL_SIZE; i++) {
                radeon_ib_try_free(rdev, &rdev->ib_pool.ibs[idx]);
                if (rdev->ib_pool.ibs[idx].fence == NULL) {
                        r = radeon_sa_bo_new(rdev, &rdev->ib_pool.sa_manager,
                                             &rdev->ib_pool.ibs[idx].sa_bo,
                                             size, 256);
                        if (!r) {
                                *ib = &rdev->ib_pool.ibs[idx];
                                (*ib)->ptr = rdev->ib_pool.sa_manager.cpu_ptr;
                                (*ib)->ptr += ((*ib)->sa_bo.offset >> 2);
                                (*ib)->gpu_addr = rdev->ib_pool.sa_manager.gpu_addr;
                                (*ib)->gpu_addr += (*ib)->sa_bo.offset;
                                (*ib)->fence = fence;
                                (*ib)->vm_id = 0;
                                (*ib)->is_const_ib = false;
                                /* ib are most likely to be allocated in a ring fashion
                                 * thus rdev->ib_pool.head_id should be the id of the
                                 * oldest ib
                                 */
                                rdev->ib_pool.head_id = (1 + idx);
                                rdev->ib_pool.head_id &= (RADEON_IB_POOL_SIZE - 1);
                                radeon_mutex_unlock(&rdev->ib_pool.mutex);
                                return 0;
                        }
                }
                idx = (idx + 1) & (RADEON_IB_POOL_SIZE - 1);
        }
        /* this should be rare event, ie all ib scheduled none signaled yet.
         */
        for (i = 0; i < RADEON_IB_POOL_SIZE; i++) {
                struct radeon_fence *fence = rdev->ib_pool.ibs[idx].fence;
                if (fence && fence->seq < RADEON_FENCE_NOTEMITED_SEQ) {
                        r = radeon_fence_wait(fence, false);
                        if (!r) {
                                goto retry;
                        }
                        /* an error happened */
                        break;
                }
                idx = (idx + 1) & (RADEON_IB_POOL_SIZE - 1);
        }
        radeon_mutex_unlock(&rdev->ib_pool.mutex);
        radeon_fence_unref(&fence);
        return r;
}

void radeon_ib_free(struct radeon_device *rdev, struct radeon_ib **ib)
{
        struct radeon_ib *tmp = *ib;

        *ib = NULL;
        if (tmp == NULL) {
                return;
        }
        radeon_mutex_lock(&rdev->ib_pool.mutex);
        if (tmp->fence && tmp->fence->seq == RADEON_FENCE_NOTEMITED_SEQ) {
                radeon_sa_bo_free(rdev, &tmp->sa_bo);
                radeon_fence_unref(&tmp->fence);
        }
        radeon_mutex_unlock(&rdev->ib_pool.mutex);
}

int radeon_ib_schedule(struct radeon_device *rdev, struct radeon_ib *ib)
{
        struct radeon_ring *ring = &rdev->ring[ib->fence->ring];
        int r = 0;

        if (!ib->length_dw || !ring->ready) {
                /* TODO: Nothings in the ib we should report. */
                DRM_ERROR("radeon: couldn't schedule IB(%u).\n", ib->idx);
                return -EINVAL;
        }

        /* 64 dwords should be enough for fence too */
        r = radeon_ring_lock(rdev, ring, 64);
        if (r) {
                DRM_ERROR("radeon: scheduling IB failed (%d).\n", r);
                return r;
        }
        radeon_ring_ib_execute(rdev, ib->fence->ring, ib);
        radeon_fence_emit(rdev, ib->fence);
        radeon_ring_unlock_commit(rdev, ring);
        return 0;
}

int radeon_ib_pool_init(struct radeon_device *rdev)
{
        struct radeon_sa_manager tmp;
        int i, r;

        r = radeon_sa_bo_manager_init(rdev, &tmp,
                                      RADEON_IB_POOL_SIZE*64*1024,
                                      RADEON_GEM_DOMAIN_GTT);
        if (r) {
                return r;
        }

        radeon_mutex_lock(&rdev->ib_pool.mutex);
        if (rdev->ib_pool.ready) {
                radeon_mutex_unlock(&rdev->ib_pool.mutex);
                radeon_sa_bo_manager_fini(rdev, &tmp);
                return 0;
        }

        rdev->ib_pool.sa_manager = tmp;
        INIT_LIST_HEAD(&rdev->ib_pool.sa_manager.sa_bo);
        for (i = 0; i < RADEON_IB_POOL_SIZE; i++) {
                rdev->ib_pool.ibs[i].fence = NULL;
                rdev->ib_pool.ibs[i].idx = i;
                rdev->ib_pool.ibs[i].length_dw = 0;
                INIT_LIST_HEAD(&rdev->ib_pool.ibs[i].sa_bo.list);
        }
        rdev->ib_pool.head_id = 0;
        rdev->ib_pool.ready = true;
        DRM_INFO("radeon: ib pool ready.\n");

        if (radeon_debugfs_ib_init(rdev)) {
                DRM_ERROR("Failed to register debugfs file for IB !\n");
        }
        radeon_mutex_unlock(&rdev->ib_pool.mutex);
        return 0;
}

void radeon_ib_pool_fini(struct radeon_device *rdev)
{
        unsigned i;

        radeon_mutex_lock(&rdev->ib_pool.mutex);
        if (rdev->ib_pool.ready) {
                for (i = 0; i < RADEON_IB_POOL_SIZE; i++) {
                        radeon_sa_bo_free(rdev, &rdev->ib_pool.ibs[i].sa_bo);
                        radeon_fence_unref(&rdev->ib_pool.ibs[i].fence);
                }
                radeon_sa_bo_manager_fini(rdev, &rdev->ib_pool.sa_manager);
                rdev->ib_pool.ready = false;
        }
        radeon_mutex_unlock(&rdev->ib_pool.mutex);
}

int radeon_ib_pool_start(struct radeon_device *rdev)
{
        return radeon_sa_bo_manager_start(rdev, &rdev->ib_pool.sa_manager);
}

int radeon_ib_pool_suspend(struct radeon_device *rdev)
{
        return radeon_sa_bo_manager_suspend(rdev, &rdev->ib_pool.sa_manager);
}

int radeon_ib_ring_tests(struct radeon_device *rdev)
{
        unsigned i;
        int r;

        for (i = 0; i < RADEON_NUM_RINGS; ++i) {
                struct radeon_ring *ring = &rdev->ring[i];

                if (!ring->ready)
                        continue;

                r = radeon_ib_test(rdev, i, ring);
                if (r) {
                        ring->ready = false;

                        if (i == RADEON_RING_TYPE_GFX_INDEX) {
                                /* oh, oh, that's really bad */
                                DRM_ERROR("radeon: failed testing IB on GFX ring (%d).\n", r);
                                rdev->accel_working = false;
                                return r;

                        } else {
                                /* still not good, but we can live with it */
                                DRM_ERROR("radeon: failed testing IB on ring %d (%d).\n", i, r);
                        }
                }
        }
        return 0;
}

/*
 * Ring.
 */
int radeon_ring_index(struct radeon_device *rdev, struct radeon_ring *ring)
{
        /* r1xx-r5xx only has CP ring */
        if (rdev->family < CHIP_R600)
                return RADEON_RING_TYPE_GFX_INDEX;

        if (rdev->family >= CHIP_CAYMAN) {
                if (ring == &rdev->ring[CAYMAN_RING_TYPE_CP1_INDEX])
                        return CAYMAN_RING_TYPE_CP1_INDEX;
                else if (ring == &rdev->ring[CAYMAN_RING_TYPE_CP2_INDEX])
                        return CAYMAN_RING_TYPE_CP2_INDEX;
        }
        return RADEON_RING_TYPE_GFX_INDEX;
}

void radeon_ring_free_size(struct radeon_device *rdev, struct radeon_ring *ring)
{
        u32 rptr;

        if (rdev->wb.enabled)
                rptr = le32_to_cpu(rdev->wb.wb[ring->rptr_offs/4]);
        else
                rptr = RREG32(ring->rptr_reg);
        ring->rptr = (rptr & ring->ptr_reg_mask) >> ring->ptr_reg_shift;
        /* This works because ring_size is a power of 2 */
        ring->ring_free_dw = (ring->rptr + (ring->ring_size / 4));
        ring->ring_free_dw -= ring->wptr;
        ring->ring_free_dw &= ring->ptr_mask;
        if (!ring->ring_free_dw) {
                ring->ring_free_dw = ring->ring_size / 4;
        }
}


int radeon_ring_alloc(struct radeon_device *rdev, struct radeon_ring *ring, unsigned ndw)
{
        int r;

        /* Align requested size with padding so unlock_commit can
         * pad safely */
        ndw = (ndw + ring->align_mask) & ~ring->align_mask;
        while (ndw > (ring->ring_free_dw - 1)) {
                radeon_ring_free_size(rdev, ring);
                if (ndw < ring->ring_free_dw) {
                        break;
                }
                mutex_unlock(&rdev->ring_lock);
                r = radeon_fence_wait_next(rdev, radeon_ring_index(rdev, ring));
                mutex_lock(&rdev->ring_lock);
                if (r)
                        return r;
        }
        ring->count_dw = ndw;
        ring->wptr_old = ring->wptr;
        return 0;
}

int radeon_ring_lock(struct radeon_device *rdev, struct radeon_ring *ring, unsigned ndw)
{
        int r;

        mutex_lock(&rdev->ring_lock);
        r = radeon_ring_alloc(rdev, ring, ndw);
        if (r) {
                mutex_unlock(&rdev->ring_lock);
                return r;
        }
        return 0;
}

void radeon_ring_commit(struct radeon_device *rdev, struct radeon_ring *ring)
{
        unsigned count_dw_pad;
        unsigned i;

        /* We pad to match fetch size */
        count_dw_pad = (ring->align_mask + 1) -
                       (ring->wptr & ring->align_mask);
        for (i = 0; i < count_dw_pad; i++) {
                radeon_ring_write(ring, ring->nop);
        }
        DRM_MEMORYBARRIER();
        WREG32(ring->wptr_reg, (ring->wptr << ring->ptr_reg_shift) & ring->ptr_reg_mask);
        (void)RREG32(ring->wptr_reg);
}

void radeon_ring_unlock_commit(struct radeon_device *rdev, struct radeon_ring *ring)
{
        radeon_ring_commit(rdev, ring);
        mutex_unlock(&rdev->ring_lock);
}

void radeon_ring_undo(struct radeon_ring *ring)
{
        ring->wptr = ring->wptr_old;
}

void radeon_ring_unlock_undo(struct radeon_device *rdev, struct radeon_ring *ring)
{
        radeon_ring_undo(ring);
        mutex_unlock(&rdev->ring_lock);
}

void radeon_ring_force_activity(struct radeon_device *rdev, struct radeon_ring *ring)
{
        int r;

        mutex_lock(&rdev->ring_lock);
        radeon_ring_free_size(rdev, ring);
        if (ring->rptr == ring->wptr) {
                r = radeon_ring_alloc(rdev, ring, 1);
                if (!r) {
                        radeon_ring_write(ring, ring->nop);
                        radeon_ring_commit(rdev, ring);
                }
        }
        mutex_unlock(&rdev->ring_lock);
}

void radeon_ring_lockup_update(struct radeon_ring *ring)
{
        ring->last_rptr = ring->rptr;
        ring->last_activity = jiffies;
}

/**
 * radeon_ring_test_lockup() - check if ring is lockedup by recording information
 * @rdev:       radeon device structure
 * @ring:       radeon_ring structure holding ring information
 *
 * We don't need to initialize the lockup tracking information as we will either
 * have CP rptr to a different value of jiffies wrap around which will force
 * initialization of the lockup tracking informations.
 *
 * A possible false positivie is if we get call after while and last_cp_rptr ==
 * the current CP rptr, even if it's unlikely it might happen. To avoid this
 * if the elapsed time since last call is bigger than 2 second than we return
 * false and update the tracking information. Due to this the caller must call
 * radeon_ring_test_lockup several time in less than 2sec for lockup to be reported
 * the fencing code should be cautious about that.
 *
 * Caller should write to the ring to force CP to do something so we don't get
 * false positive when CP is just gived nothing to do.
 *
 **/
bool radeon_ring_test_lockup(struct radeon_device *rdev, struct radeon_ring *ring)
{
        unsigned long cjiffies, elapsed;
        uint32_t rptr;

        cjiffies = jiffies;
        if (!time_after(cjiffies, ring->last_activity)) {
                /* likely a wrap around */
                radeon_ring_lockup_update(ring);
                return false;
        }
        rptr = RREG32(ring->rptr_reg);
        ring->rptr = (rptr & ring->ptr_reg_mask) >> ring->ptr_reg_shift;
        if (ring->rptr != ring->last_rptr) {
                /* CP is still working no lockup */
                radeon_ring_lockup_update(ring);
                return false;
        }
        elapsed = jiffies_to_msecs(cjiffies - ring->last_activity);
        if (radeon_lockup_timeout && elapsed >= radeon_lockup_timeout) {
                dev_err(rdev->dev, "GPU lockup CP stall for more than %lumsec\n", elapsed);
                return true;
        }
        /* give a chance to the GPU ... */
        return false;
}

int radeon_ring_init(struct radeon_device *rdev, struct radeon_ring *ring, unsigned ring_size,
                     unsigned rptr_offs, unsigned rptr_reg, unsigned wptr_reg,
                     u32 ptr_reg_shift, u32 ptr_reg_mask, u32 nop)
{
        int r;

        ring->ring_size = ring_size;
        ring->rptr_offs = rptr_offs;
        ring->rptr_reg = rptr_reg;
        ring->wptr_reg = wptr_reg;
        ring->ptr_reg_shift = ptr_reg_shift;
        ring->ptr_reg_mask = ptr_reg_mask;
        ring->nop = nop;
        /* Allocate ring buffer */
        if (ring->ring_obj == NULL) {
                r = radeon_bo_create(rdev, ring->ring_size, PAGE_SIZE, true,
                                        RADEON_GEM_DOMAIN_GTT,
                                        &ring->ring_obj);
                if (r) {
                        dev_err(rdev->dev, "(%d) ring create failed\n", r);
                        return r;
                }
                r = radeon_bo_reserve(ring->ring_obj, false);
                if (unlikely(r != 0))
                        return r;
                r = radeon_bo_pin(ring->ring_obj, RADEON_GEM_DOMAIN_GTT,
                                        &ring->gpu_addr);
                if (r) {
                        radeon_bo_unreserve(ring->ring_obj);
                        dev_err(rdev->dev, "(%d) ring pin failed\n", r);
                        return r;
                }
                r = radeon_bo_kmap(ring->ring_obj,
                                       (void **)&ring->ring);
                radeon_bo_unreserve(ring->ring_obj);
                if (r) {
                        dev_err(rdev->dev, "(%d) ring map failed\n", r);
                        return r;
                }
        }
        ring->ptr_mask = (ring->ring_size / 4) - 1;
        ring->ring_free_dw = ring->ring_size / 4;
        if (radeon_debugfs_ring_init(rdev, ring)) {
                DRM_ERROR("Failed to register debugfs file for rings !\n");
        }
        return 0;
}

void radeon_ring_fini(struct radeon_device *rdev, struct radeon_ring *ring)
{
        int r;
        struct radeon_bo *ring_obj;

        mutex_lock(&rdev->ring_lock);
        ring_obj = ring->ring_obj;
        ring->ready = false;
        ring->ring = NULL;
        ring->ring_obj = NULL;
        mutex_unlock(&rdev->ring_lock);

        if (ring_obj) {
                r = radeon_bo_reserve(ring_obj, false);
                if (likely(r == 0)) {
                        radeon_bo_kunmap(ring_obj);
                        radeon_bo_unpin(ring_obj);
                        radeon_bo_unreserve(ring_obj);
                }
                radeon_bo_unref(&ring_obj);
        }
}

/*
 * Debugfs info
 */
#if defined(CONFIG_DEBUG_FS)

static int radeon_debugfs_ring_info(struct seq_file *m, void *data)
{
        struct drm_info_node *node = (struct drm_info_node *) m->private;
        struct drm_device *dev = node->minor->dev;
        struct radeon_device *rdev = dev->dev_private;
        int ridx = *(int*)node->info_ent->data;
        struct radeon_ring *ring = &rdev->ring[ridx];
        unsigned count, i, j;

        radeon_ring_free_size(rdev, ring);
        count = (ring->ring_size / 4) - ring->ring_free_dw;
        seq_printf(m, "wptr(0x%04x): 0x%08x\n", ring->wptr_reg, RREG32(ring->wptr_reg));
        seq_printf(m, "rptr(0x%04x): 0x%08x\n", ring->rptr_reg, RREG32(ring->rptr_reg));
        seq_printf(m, "driver's copy of the wptr: 0x%08x\n", ring->wptr);
        seq_printf(m, "driver's copy of the rptr: 0x%08x\n", ring->rptr);
        seq_printf(m, "%u free dwords in ring\n", ring->ring_free_dw);
        seq_printf(m, "%u dwords in ring\n", count);
        i = ring->rptr;
        for (j = 0; j <= count; j++) {
                seq_printf(m, "r[%04d]=0x%08x\n", i, ring->ring[i]);
                i = (i + 1) & ring->ptr_mask;
        }
        return 0;
}

static int radeon_ring_type_gfx_index = RADEON_RING_TYPE_GFX_INDEX;
static int cayman_ring_type_cp1_index = CAYMAN_RING_TYPE_CP1_INDEX;
static int cayman_ring_type_cp2_index = CAYMAN_RING_TYPE_CP2_INDEX;

static struct drm_info_list radeon_debugfs_ring_info_list[] = {
        {"radeon_ring_gfx", radeon_debugfs_ring_info, 0, &radeon_ring_type_gfx_index},
        {"radeon_ring_cp1", radeon_debugfs_ring_info, 0, &cayman_ring_type_cp1_index},
        {"radeon_ring_cp2", radeon_debugfs_ring_info, 0, &cayman_ring_type_cp2_index},
};

static int radeon_debugfs_ib_info(struct seq_file *m, void *data)
{
        struct drm_info_node *node = (struct drm_info_node *) m->private;
        struct drm_device *dev = node->minor->dev;
        struct radeon_device *rdev = dev->dev_private;
        struct radeon_ib *ib = &rdev->ib_pool.ibs[*((unsigned*)node->info_ent->data)];
        unsigned i;

        if (ib == NULL) {
                return 0;
        }
        seq_printf(m, "IB %04u\n", ib->idx);
        seq_printf(m, "IB fence %p\n", ib->fence);
        seq_printf(m, "IB size %05u dwords\n", ib->length_dw);
        for (i = 0; i < ib->length_dw; i++) {
                seq_printf(m, "[%05u]=0x%08X\n", i, ib->ptr[i]);
        }
        return 0;
}

static struct drm_info_list radeon_debugfs_ib_list[RADEON_IB_POOL_SIZE];
static char radeon_debugfs_ib_names[RADEON_IB_POOL_SIZE][32];
static unsigned radeon_debugfs_ib_idx[RADEON_IB_POOL_SIZE];
#endif

int radeon_debugfs_ring_init(struct radeon_device *rdev, struct radeon_ring *ring)
{
#if defined(CONFIG_DEBUG_FS)
        unsigned i;
        for (i = 0; i < ARRAY_SIZE(radeon_debugfs_ring_info_list); ++i) {
                struct drm_info_list *info = &radeon_debugfs_ring_info_list[i];
                int ridx = *(int*)radeon_debugfs_ring_info_list[i].data;
                unsigned r;

                if (&rdev->ring[ridx] != ring)
                        continue;

                r = radeon_debugfs_add_files(rdev, info, 1);
                if (r)
                        return r;
        }
#endif
        return 0;
}

int radeon_debugfs_ib_init(struct radeon_device *rdev)
{
#if defined(CONFIG_DEBUG_FS)
        unsigned i;

        for (i = 0; i < RADEON_IB_POOL_SIZE; i++) {
                sprintf(radeon_debugfs_ib_names[i], "radeon_ib_%04u", i);
                radeon_debugfs_ib_idx[i] = i;
                radeon_debugfs_ib_list[i].name = radeon_debugfs_ib_names[i];
                radeon_debugfs_ib_list[i].show = &radeon_debugfs_ib_info;
                radeon_debugfs_ib_list[i].driver_features = 0;
                radeon_debugfs_ib_list[i].data = &radeon_debugfs_ib_idx[i];
        }
        return radeon_debugfs_add_files(rdev, radeon_debugfs_ib_list,
                                        RADEON_IB_POOL_SIZE);
#else
        return 0;
#endif
}