From 445d85e3c1dfd8c45b24be6f1527f1e117256d0e Mon Sep 17 00:00:00 2001 From: Alex Deucher Date: Tue, 21 Mar 2023 13:59:13 -0400 Subject: [PATCH] drm/amdgpu: add debugfs interface for reading MQDs MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Provide a debugfs interface to access the MQD. Useful for debugging issues with the CP and MES hardware scheduler. v2: fix missing unreserve/unmap when pos >= size (Alex) Reviewed-by: Christian König Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c | 59 ++++++++++++++++++++++++++++++++ 1 file changed, 59 insertions(+) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c index eaf0f82..1e9ae3b 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c @@ -509,6 +509,59 @@ static const struct file_operations amdgpu_debugfs_ring_fops = { .llseek = default_llseek }; +static ssize_t amdgpu_debugfs_mqd_read(struct file *f, char __user *buf, + size_t size, loff_t *pos) +{ + struct amdgpu_ring *ring = file_inode(f)->i_private; + volatile u32 *mqd; + int r; + uint32_t value, result; + + if (*pos & 3 || size & 3) + return -EINVAL; + + result = 0; + + r = amdgpu_bo_reserve(ring->mqd_obj, false); + if (unlikely(r != 0)) + return r; + + r = amdgpu_bo_kmap(ring->mqd_obj, (void **)&mqd); + if (r) { + amdgpu_bo_unreserve(ring->mqd_obj); + return r; + } + + while (size) { + if (*pos >= ring->mqd_size) + goto done; + + value = mqd[*pos/4]; + r = put_user(value, (uint32_t *)buf); + if (r) + goto done; + buf += 4; + result += 4; + size -= 4; + *pos += 4; + } + +done: + amdgpu_bo_kunmap(ring->mqd_obj); + mqd = NULL; + amdgpu_bo_unreserve(ring->mqd_obj); + if (r) + return r; + + return result; +} + +static const struct file_operations amdgpu_debugfs_mqd_fops = { + .owner = THIS_MODULE, + .read = amdgpu_debugfs_mqd_read, + .llseek = default_llseek +}; + #endif void amdgpu_debugfs_ring_init(struct amdgpu_device *adev, @@ -524,6 +577,12 @@ void amdgpu_debugfs_ring_init(struct amdgpu_device *adev, &amdgpu_debugfs_ring_fops, ring->ring_size + 12); + if (ring->mqd_obj) { + sprintf(name, "amdgpu_mqd_%s", ring->name); + debugfs_create_file_size(name, S_IFREG | S_IRUGO, root, ring, + &amdgpu_debugfs_mqd_fops, + ring->mqd_size); + } #endif } -- 2.7.4