mm: hugetlb: fix hugepage memory leak caused by wrong reserve count

[linux/fpc-iii.git] / drivers / gpu / drm / amd / amdgpu / amdgpu_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
 *          Christian König
 */
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <drm/drmP.h>
#include <drm/amdgpu_drm.h>
#include "amdgpu.h"
#include "atom.h"

/*
 * Rings
 * Most engines on the GPU are fed via ring buffers.  Ring
 * buffers are areas of GPU accessible memory that the host
 * writes commands into and the GPU reads commands out of.
 * There is a rptr (read pointer) that determines where the
 * GPU is currently reading, and a wptr (write pointer)
 * which determines where the host has written.  When the
 * pointers are equal, the ring is idle.  When the host
 * writes commands to the ring buffer, it increments the
 * wptr.  The GPU then starts fetching commands and executes
 * them until the pointers are equal again.
 */
static int amdgpu_debugfs_ring_init(struct amdgpu_device *adev, struct amdgpu_ring *ring);

/**
 * amdgpu_ring_free_size - update the free size
 *
 * @adev: amdgpu_device pointer
 * @ring: amdgpu_ring structure holding ring information
 *
 * Update the free dw slots in the ring buffer (all asics).
 */
void amdgpu_ring_free_size(struct amdgpu_ring *ring)
{
        uint32_t rptr = amdgpu_ring_get_rptr(ring);

        /* This works because ring_size is a power of 2 */
        ring->ring_free_dw = rptr + (ring->ring_size / 4);
        ring->ring_free_dw -= ring->wptr;
        ring->ring_free_dw &= ring->ptr_mask;
        if (!ring->ring_free_dw) {
                /* this is an empty ring */
                ring->ring_free_dw = ring->ring_size / 4;
        }
}

/**
 * amdgpu_ring_alloc - allocate space on the ring buffer
 *
 * @adev: amdgpu_device pointer
 * @ring: amdgpu_ring structure holding ring information
 * @ndw: number of dwords to allocate in the ring buffer
 *
 * Allocate @ndw dwords in the ring buffer (all asics).
 * Returns 0 on success, error on failure.
 */
int amdgpu_ring_alloc(struct amdgpu_ring *ring, unsigned ndw)
{
        int r;

        /* make sure we aren't trying to allocate more space than there is on the ring */
        if (ndw > (ring->ring_size / 4))
                return -ENOMEM;
        /* Align requested size with padding so unlock_commit can
         * pad safely */
        amdgpu_ring_free_size(ring);
        ndw = (ndw + ring->align_mask) & ~ring->align_mask;
        while (ndw > (ring->ring_free_dw - 1)) {
                amdgpu_ring_free_size(ring);
                if (ndw < ring->ring_free_dw) {
                        break;
                }
                r = amdgpu_fence_wait_next(ring);
                if (r)
                        return r;
        }
        ring->count_dw = ndw;
        ring->wptr_old = ring->wptr;
        return 0;
}

/**
 * amdgpu_ring_lock - lock the ring and allocate space on it
 *
 * @adev: amdgpu_device pointer
 * @ring: amdgpu_ring structure holding ring information
 * @ndw: number of dwords to allocate in the ring buffer
 *
 * Lock the ring and allocate @ndw dwords in the ring buffer
 * (all asics).
 * Returns 0 on success, error on failure.
 */
int amdgpu_ring_lock(struct amdgpu_ring *ring, unsigned ndw)
{
        int r;

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

/** amdgpu_ring_insert_nop - insert NOP packets
 *
 * @ring: amdgpu_ring structure holding ring information
 * @count: the number of NOP packets to insert
 *
 * This is the generic insert_nop function for rings except SDMA
 */
void amdgpu_ring_insert_nop(struct amdgpu_ring *ring, uint32_t count)
{
        int i;

        for (i = 0; i < count; i++)
                amdgpu_ring_write(ring, ring->nop);
}

/**
 * amdgpu_ring_commit - tell the GPU to execute the new
 * commands on the ring buffer
 *
 * @adev: amdgpu_device pointer
 * @ring: amdgpu_ring structure holding ring information
 *
 * Update the wptr (write pointer) to tell the GPU to
 * execute new commands on the ring buffer (all asics).
 */
void amdgpu_ring_commit(struct amdgpu_ring *ring)
{
        uint32_t count;

        /* We pad to match fetch size */
        count = ring->align_mask + 1 - (ring->wptr & ring->align_mask);
        count %= ring->align_mask + 1;
        ring->funcs->insert_nop(ring, count);

        mb();
        amdgpu_ring_set_wptr(ring);
}

/**
 * amdgpu_ring_unlock_commit - tell the GPU to execute the new
 * commands on the ring buffer and unlock it
 *
 * @ring: amdgpu_ring structure holding ring information
 *
 * Call amdgpu_ring_commit() then unlock the ring (all asics).
 */
void amdgpu_ring_unlock_commit(struct amdgpu_ring *ring)
{
        amdgpu_ring_commit(ring);
        mutex_unlock(ring->ring_lock);
}

/**
 * amdgpu_ring_undo - reset the wptr
 *
 * @ring: amdgpu_ring structure holding ring information
 *
 * Reset the driver's copy of the wptr (all asics).
 */
void amdgpu_ring_undo(struct amdgpu_ring *ring)
{
        ring->wptr = ring->wptr_old;
}

/**
 * amdgpu_ring_unlock_undo - reset the wptr and unlock the ring
 *
 * @ring: amdgpu_ring structure holding ring information
 *
 * Call amdgpu_ring_undo() then unlock the ring (all asics).
 */
void amdgpu_ring_unlock_undo(struct amdgpu_ring *ring)
{
        amdgpu_ring_undo(ring);
        mutex_unlock(ring->ring_lock);
}

/**
 * amdgpu_ring_backup - Back up the content of a ring
 *
 * @ring: the ring we want to back up
 *
 * Saves all unprocessed commits from a ring, returns the number of dwords saved.
 */
unsigned amdgpu_ring_backup(struct amdgpu_ring *ring,
                            uint32_t **data)
{
        unsigned size, ptr, i;

        /* just in case lock the ring */
        mutex_lock(ring->ring_lock);
        *data = NULL;

        if (ring->ring_obj == NULL) {
                mutex_unlock(ring->ring_lock);
                return 0;
        }

        /* it doesn't make sense to save anything if all fences are signaled */
        if (!amdgpu_fence_count_emitted(ring)) {
                mutex_unlock(ring->ring_lock);
                return 0;
        }

        ptr = le32_to_cpu(*ring->next_rptr_cpu_addr);

        size = ring->wptr + (ring->ring_size / 4);
        size -= ptr;
        size &= ring->ptr_mask;
        if (size == 0) {
                mutex_unlock(ring->ring_lock);
                return 0;
        }

        /* and then save the content of the ring */
        *data = kmalloc_array(size, sizeof(uint32_t), GFP_KERNEL);
        if (!*data) {
                mutex_unlock(ring->ring_lock);
                return 0;
        }
        for (i = 0; i < size; ++i) {
                (*data)[i] = ring->ring[ptr++];
                ptr &= ring->ptr_mask;
        }

        mutex_unlock(ring->ring_lock);
        return size;
}

/**
 * amdgpu_ring_restore - append saved commands to the ring again
 *
 * @ring: ring to append commands to
 * @size: number of dwords we want to write
 * @data: saved commands
 *
 * Allocates space on the ring and restore the previously saved commands.
 */
int amdgpu_ring_restore(struct amdgpu_ring *ring,
                        unsigned size, uint32_t *data)
{
        int i, r;

        if (!size || !data)
                return 0;

        /* restore the saved ring content */
        r = amdgpu_ring_lock(ring, size);
        if (r)
                return r;

        for (i = 0; i < size; ++i) {
                amdgpu_ring_write(ring, data[i]);
        }

        amdgpu_ring_unlock_commit(ring);
        kfree(data);
        return 0;
}

/**
 * amdgpu_ring_init - init driver ring struct.
 *
 * @adev: amdgpu_device pointer
 * @ring: amdgpu_ring structure holding ring information
 * @ring_size: size of the ring
 * @nop: nop packet for this ring
 *
 * Initialize the driver information for the selected ring (all asics).
 * Returns 0 on success, error on failure.
 */
int amdgpu_ring_init(struct amdgpu_device *adev, struct amdgpu_ring *ring,
                     unsigned ring_size, u32 nop, u32 align_mask,
                     struct amdgpu_irq_src *irq_src, unsigned irq_type,
                     enum amdgpu_ring_type ring_type)
{
        u32 rb_bufsz;
        int r;

        if (ring->adev == NULL) {
                if (adev->num_rings >= AMDGPU_MAX_RINGS)
                        return -EINVAL;

                ring->adev = adev;
                ring->idx = adev->num_rings++;
                adev->rings[ring->idx] = ring;
                r = amdgpu_fence_driver_init_ring(ring);
                if (r)
                        return r;
        }

        r = amdgpu_wb_get(adev, &ring->rptr_offs);
        if (r) {
                dev_err(adev->dev, "(%d) ring rptr_offs wb alloc failed\n", r);
                return r;
        }

        r = amdgpu_wb_get(adev, &ring->wptr_offs);
        if (r) {
                dev_err(adev->dev, "(%d) ring wptr_offs wb alloc failed\n", r);
                return r;
        }

        r = amdgpu_wb_get(adev, &ring->fence_offs);
        if (r) {
                dev_err(adev->dev, "(%d) ring fence_offs wb alloc failed\n", r);
                return r;
        }

        r = amdgpu_wb_get(adev, &ring->next_rptr_offs);
        if (r) {
                dev_err(adev->dev, "(%d) ring next_rptr wb alloc failed\n", r);
                return r;
        }
        ring->next_rptr_gpu_addr = adev->wb.gpu_addr + (ring->next_rptr_offs * 4);
        ring->next_rptr_cpu_addr = &adev->wb.wb[ring->next_rptr_offs];
        spin_lock_init(&ring->fence_lock);
        r = amdgpu_fence_driver_start_ring(ring, irq_src, irq_type);
        if (r) {
                dev_err(adev->dev, "failed initializing fences (%d).\n", r);
                return r;
        }

        ring->ring_lock = &adev->ring_lock;
        /* Align ring size */
        rb_bufsz = order_base_2(ring_size / 8);
        ring_size = (1 << (rb_bufsz + 1)) * 4;
        ring->ring_size = ring_size;
        ring->align_mask = align_mask;
        ring->nop = nop;
        ring->type = ring_type;

        /* Allocate ring buffer */
        if (ring->ring_obj == NULL) {
                r = amdgpu_bo_create(adev, ring->ring_size, PAGE_SIZE, true,
                                     AMDGPU_GEM_DOMAIN_GTT, 0,
                                     NULL, NULL, &ring->ring_obj);
                if (r) {
                        dev_err(adev->dev, "(%d) ring create failed\n", r);
                        return r;
                }
                r = amdgpu_bo_reserve(ring->ring_obj, false);
                if (unlikely(r != 0))
                        return r;
                r = amdgpu_bo_pin(ring->ring_obj, AMDGPU_GEM_DOMAIN_GTT,
                                        &ring->gpu_addr);
                if (r) {
                        amdgpu_bo_unreserve(ring->ring_obj);
                        dev_err(adev->dev, "(%d) ring pin failed\n", r);
                        return r;
                }
                r = amdgpu_bo_kmap(ring->ring_obj,
                                       (void **)&ring->ring);
                amdgpu_bo_unreserve(ring->ring_obj);
                if (r) {
                        dev_err(adev->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 (amdgpu_debugfs_ring_init(adev, ring)) {
                DRM_ERROR("Failed to register debugfs file for rings !\n");
        }
        return 0;
}

/**
 * amdgpu_ring_fini - tear down the driver ring struct.
 *
 * @adev: amdgpu_device pointer
 * @ring: amdgpu_ring structure holding ring information
 *
 * Tear down the driver information for the selected ring (all asics).
 */
void amdgpu_ring_fini(struct amdgpu_ring *ring)
{
        int r;
        struct amdgpu_bo *ring_obj;

        if (ring->ring_lock == NULL)
                return;

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

        amdgpu_wb_free(ring->adev, ring->fence_offs);
        amdgpu_wb_free(ring->adev, ring->rptr_offs);
        amdgpu_wb_free(ring->adev, ring->wptr_offs);
        amdgpu_wb_free(ring->adev, ring->next_rptr_offs);

        if (ring_obj) {
                r = amdgpu_bo_reserve(ring_obj, false);
                if (likely(r == 0)) {
                        amdgpu_bo_kunmap(ring_obj);
                        amdgpu_bo_unpin(ring_obj);
                        amdgpu_bo_unreserve(ring_obj);
                }
                amdgpu_bo_unref(&ring_obj);
        }
}

/**
 * amdgpu_ring_from_fence - get ring from fence
 *
 * @f: fence structure
 *
 * Extract the ring a fence belongs to. Handles both scheduler as
 * well as hardware fences.
 */
struct amdgpu_ring *amdgpu_ring_from_fence(struct fence *f)
{
        struct amdgpu_fence *a_fence;
        struct amd_sched_fence *s_fence;

        s_fence = to_amd_sched_fence(f);
        if (s_fence)
                return container_of(s_fence->sched, struct amdgpu_ring, sched);

        a_fence = to_amdgpu_fence(f);
        if (a_fence)
                return a_fence->ring;

        return NULL;
}

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

static int amdgpu_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 amdgpu_device *adev = dev->dev_private;
        int roffset = *(int*)node->info_ent->data;
        struct amdgpu_ring *ring = (void *)(((uint8_t*)adev) + roffset);

        uint32_t rptr, wptr, rptr_next;
        unsigned count, i, j;

        amdgpu_ring_free_size(ring);
        count = (ring->ring_size / 4) - ring->ring_free_dw;

        wptr = amdgpu_ring_get_wptr(ring);
        seq_printf(m, "wptr: 0x%08x [%5d]\n",
                   wptr, wptr);

        rptr = amdgpu_ring_get_rptr(ring);
        seq_printf(m, "rptr: 0x%08x [%5d]\n",
                   rptr, rptr);

        rptr_next = ~0;

        seq_printf(m, "driver's copy of the wptr: 0x%08x [%5d]\n",
                   ring->wptr, ring->wptr);
        seq_printf(m, "last semaphore signal addr : 0x%016llx\n",
                   ring->last_semaphore_signal_addr);
        seq_printf(m, "last semaphore wait addr   : 0x%016llx\n",
                   ring->last_semaphore_wait_addr);
        seq_printf(m, "%u free dwords in ring\n", ring->ring_free_dw);
        seq_printf(m, "%u dwords in ring\n", count);

        if (!ring->ready)
                return 0;

        /* print 8 dw before current rptr as often it's the last executed
         * packet that is the root issue
         */
        i = (rptr + ring->ptr_mask + 1 - 32) & ring->ptr_mask;
        for (j = 0; j <= (count + 32); j++) {
                seq_printf(m, "r[%5d]=0x%08x", i, ring->ring[i]);
                if (rptr == i)
                        seq_puts(m, " *");
                if (rptr_next == i)
                        seq_puts(m, " #");
                seq_puts(m, "\n");
                i = (i + 1) & ring->ptr_mask;
        }
        return 0;
}

/* TODO: clean this up !*/
static int amdgpu_gfx_index = offsetof(struct amdgpu_device, gfx.gfx_ring[0]);
static int cayman_cp1_index = offsetof(struct amdgpu_device, gfx.compute_ring[0]);
static int cayman_cp2_index = offsetof(struct amdgpu_device, gfx.compute_ring[1]);
static int amdgpu_dma1_index = offsetof(struct amdgpu_device, sdma.instance[0].ring);
static int amdgpu_dma2_index = offsetof(struct amdgpu_device, sdma.instance[1].ring);
static int r600_uvd_index = offsetof(struct amdgpu_device, uvd.ring);
static int si_vce1_index = offsetof(struct amdgpu_device, vce.ring[0]);
static int si_vce2_index = offsetof(struct amdgpu_device, vce.ring[1]);

static struct drm_info_list amdgpu_debugfs_ring_info_list[] = {
        {"amdgpu_ring_gfx", amdgpu_debugfs_ring_info, 0, &amdgpu_gfx_index},
        {"amdgpu_ring_cp1", amdgpu_debugfs_ring_info, 0, &cayman_cp1_index},
        {"amdgpu_ring_cp2", amdgpu_debugfs_ring_info, 0, &cayman_cp2_index},
        {"amdgpu_ring_dma1", amdgpu_debugfs_ring_info, 0, &amdgpu_dma1_index},
        {"amdgpu_ring_dma2", amdgpu_debugfs_ring_info, 0, &amdgpu_dma2_index},
        {"amdgpu_ring_uvd", amdgpu_debugfs_ring_info, 0, &r600_uvd_index},
        {"amdgpu_ring_vce1", amdgpu_debugfs_ring_info, 0, &si_vce1_index},
        {"amdgpu_ring_vce2", amdgpu_debugfs_ring_info, 0, &si_vce2_index},
};

#endif

static int amdgpu_debugfs_ring_init(struct amdgpu_device *adev, struct amdgpu_ring *ring)
{
#if defined(CONFIG_DEBUG_FS)
        unsigned i;
        for (i = 0; i < ARRAY_SIZE(amdgpu_debugfs_ring_info_list); ++i) {
                struct drm_info_list *info = &amdgpu_debugfs_ring_info_list[i];
                int roffset = *(int*)amdgpu_debugfs_ring_info_list[i].data;
                struct amdgpu_ring *other = (void *)(((uint8_t*)adev) + roffset);
                unsigned r;

                if (other != ring)
                        continue;

                r = amdgpu_debugfs_add_files(adev, info, 1);
                if (r)
                        return r;
        }
#endif
        return 0;
}