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Release 4.11 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 <linux/debugfs.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);
static void amdgpu_debugfs_ring_fini(struct amdgpu_ring *ring);

/**
 * 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) { /* Align requested size with padding so unlock_commit can * pad safely */ ndw = (ndw + ring->funcs->align_mask) & ~ring->funcs->align_mask; /* Make sure we aren't trying to allocate more space * than the maximum for one submission */ if (WARN_ON_ONCE(ndw > ring->max_dw)) return -ENOMEM; ring->count_dw = ndw; ring->wptr_old = ring->wptr; if (ring->funcs->begin_use) ring->funcs->begin_use(ring); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Alex Deucher5566.27%125.00%
Christian König2833.73%375.00%
Total83100.00%4100.00%

/** 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->funcs->nop); }

Contributors

PersonTokensPropCommitsCommitProp
Jammy Zhou3895.00%150.00%
Christian König25.00%150.00%
Total40100.00%2100.00%

/** amdgpu_ring_generic_pad_ib - pad IB with NOP packets * * @ring: amdgpu_ring structure holding ring information * @ib: IB to add NOP packets to * * This is the generic pad_ib function for rings except SDMA */
void amdgpu_ring_generic_pad_ib(struct amdgpu_ring *ring, struct amdgpu_ib *ib) { while (ib->length_dw & ring->funcs->align_mask) ib->ptr[ib->length_dw++] = ring->funcs->nop; }

Contributors

PersonTokensPropCommitsCommitProp
Christian König43100.00%2100.00%
Total43100.00%2100.00%

/** * 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->funcs->align_mask + 1 - (ring->wptr & ring->funcs->align_mask); count %= ring->funcs->align_mask + 1; ring->funcs->insert_nop(ring, count); mb(); amdgpu_ring_set_wptr(ring); if (ring->funcs->end_use) ring->funcs->end_use(ring); }

Contributors

PersonTokensPropCommitsCommitProp
Alex Deucher3137.80%125.00%
Jammy Zhou2834.15%125.00%
Christian König2328.05%250.00%
Total82100.00%4100.00%

/** * 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; if (ring->funcs->end_use) ring->funcs->end_use(ring); }

Contributors

PersonTokensPropCommitsCommitProp
Alex Deucher1851.43%150.00%
Christian König1748.57%150.00%
Total35100.00%2100.00%

/** * amdgpu_ring_init - init driver ring struct. * * @adev: amdgpu_device pointer * @ring: amdgpu_ring structure holding ring information * @max_ndw: maximum number of dw for ring alloc * @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 max_dw, struct amdgpu_irq_src *irq_src, unsigned irq_type) { 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, amdgpu_sched_hw_submission); 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->cond_exe_offs); if (r) { dev_err(adev->dev, "(%d) ring cond_exec_polling wb alloc failed\n", r); return r; } ring->cond_exe_gpu_addr = adev->wb.gpu_addr + (ring->cond_exe_offs * 4); ring->cond_exe_cpu_addr = &adev->wb.wb[ring->cond_exe_offs]; /* always set cond_exec_polling to CONTINUE */ *ring->cond_exe_cpu_addr = 1; 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_size = roundup_pow_of_two(max_dw * 4 * amdgpu_sched_hw_submission); /* Allocate ring buffer */ if (ring->ring_obj == NULL) { r = amdgpu_bo_create_kernel(adev, ring->ring_size, PAGE_SIZE, AMDGPU_GEM_DOMAIN_GTT, &ring->ring_obj, &ring->gpu_addr, (void **)&ring->ring); if (r) { dev_err(adev->dev, "(%d) ring create failed\n", r); return r; } memset((void *)ring->ring, 0, ring->ring_size); } ring->ptr_mask = (ring->ring_size / 4) - 1; ring->max_dw = max_dw; if (amdgpu_debugfs_ring_init(adev, ring)) { DRM_ERROR("Failed to register debugfs file for rings !\n"); } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Alex Deucher31573.43%111.11%
Monk Liu8219.11%333.33%
Christian König327.46%555.56%
Total429100.00%9100.00%

/** * 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) { ring->ready = false; amdgpu_wb_free(ring->adev, ring->cond_exe_offs); 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_bo_free_kernel(&ring->ring_obj, &ring->gpu_addr, (void **)&ring->ring); amdgpu_debugfs_ring_fini(ring); ring->adev->rings[ring->idx] = NULL; }

Contributors

PersonTokensPropCommitsCommitProp
Alex Deucher5554.46%120.00%
Junwei (Martin) Zhang1716.83%120.00%
Monk Liu1615.84%240.00%
Grazvydas Ignotas1312.87%120.00%
Total101100.00%5100.00%

/* * Debugfs info */ #if defined(CONFIG_DEBUG_FS) /* Layout of file is 12 bytes consisting of * - rptr * - wptr * - driver's copy of wptr * * followed by n-words of ring data */
static ssize_t amdgpu_debugfs_ring_read(struct file *f, char __user *buf, size_t size, loff_t *pos) { struct amdgpu_ring *ring = file_inode(f)->i_private; int r, i; uint32_t value, result, early[3]; if (*pos & 3 || size & 3) return -EINVAL; result = 0; if (*pos < 12) { early[0] = amdgpu_ring_get_rptr(ring); early[1] = amdgpu_ring_get_wptr(ring); early[2] = ring->wptr; for (i = *pos / 4; i < 3 && size; i++) { r = put_user(early[i], (uint32_t *)buf); if (r) return r; buf += 4; result += 4; size -= 4; *pos += 4; } } while (size) { if (*pos >= (ring->ring_size + 12)) return result; value = ring->ring[(*pos - 12)/4]; r = put_user(value, (uint32_t*)buf); if (r) return r; buf += 4; result += 4; size -= 4; *pos += 4; } return result; }

Contributors

PersonTokensPropCommitsCommitProp
Tom St Denis16466.94%233.33%
Alex Deucher5321.63%116.67%
Christian König2510.20%233.33%
Al Viro31.22%116.67%
Total245100.00%6100.00%

static const struct file_operations amdgpu_debugfs_ring_fops = { .owner = THIS_MODULE, .read = amdgpu_debugfs_ring_read, .llseek = default_llseek }; #endif
static int amdgpu_debugfs_ring_init(struct amdgpu_device *adev, struct amdgpu_ring *ring) { #if defined(CONFIG_DEBUG_FS) struct drm_minor *minor = adev->ddev->primary; struct dentry *ent, *root = minor->debugfs_root; char name[32]; sprintf(name, "amdgpu_ring_%s", ring->name); ent = debugfs_create_file(name, S_IFREG | S_IRUGO, root, ring, &amdgpu_debugfs_ring_fops); if (!ent) return -ENOMEM; i_size_write(ent->d_inode, ring->ring_size + 12); ring->ent = ent; #endif return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Tom St Denis5145.13%120.00%
Alex Deucher3026.55%120.00%
Christian König2320.35%120.00%
Monk Liu65.31%120.00%
Dan Carpenter32.65%120.00%
Total113100.00%5100.00%


static void amdgpu_debugfs_ring_fini(struct amdgpu_ring *ring) { #if defined(CONFIG_DEBUG_FS) debugfs_remove(ring->ent); #endif }

Contributors

PersonTokensPropCommitsCommitProp
Monk Liu26100.00%1100.00%
Total26100.00%1100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Alex Deucher60747.24%14.35%
Tom St Denis23918.60%28.70%
Christian König19615.25%1043.48%
Monk Liu14010.89%521.74%
Jammy Zhou675.21%14.35%
Junwei (Martin) Zhang171.32%14.35%
Grazvydas Ignotas131.01%14.35%
Dan Carpenter30.23%14.35%
Al Viro30.23%14.35%
Total1285100.00%23100.00%
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