From 2b130ed9fbf3819178290e2e3a7f1ce569bff3a2 Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@amd.com>
Date: Tue, 21 Mar 2023 13:59:13 -0400
Subject: drm/amdgpu: add debugfs interface for reading MQDs
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Git-commit: 445d85e3c1dfd8c45b24be6f1527f1e117256d0e
Patch-mainline: v6.5-rc1
References: jsc#PED-3527 jsc#PED-5475 jsc#PED-6068 jsc#PED-6070 jsc#PED-6116 jsc#PED-6120 jsc#PED-5065 jsc#PED-5477 jsc#PED-5511 jsc#PED-6041 jsc#PED-6069 jsc#PED-6071
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 <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
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 54ea0a0aaa8c..2bc1ca2084dc 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
}
--
2.42.0