1 // SPDX-License-Identifier: GPL-2.0
4 * Copyright 2016-2019 HabanaLabs, Ltd.
8 #include "habanalabs.h"
10 #include <linux/slab.h>
12 static void hl_ctx_fini(struct hl_ctx *ctx)
14 struct hl_device *hdev = ctx->hdev;
18 * If we arrived here, there are no jobs waiting for this context
19 * on its queues so we can safely remove it.
20 * This is because for each CS, we increment the ref count and for
21 * every CS that was finished we decrement it and we won't arrive
22 * to this function unless the ref count is 0
25 for (i = 0 ; i < HL_MAX_PENDING_CS ; i++)
26 dma_fence_put(ctx->cs_pending[i]);
28 if (ctx->asid != HL_KERNEL_ASID_ID) {
29 /* The engines are stopped as there is no executing CS, but the
30 * Coresight might be still working by accessing addresses
31 * related to the stopped engines. Hence stop it explicitly.
32 * Stop only if this is the compute context, as there can be
33 * only one compute context
35 if ((hdev->in_debug) && (hdev->compute_ctx == ctx))
36 hl_device_set_debug_mode(hdev, false);
39 hl_asid_free(hdev, ctx->asid);
45 void hl_ctx_do_release(struct kref *ref)
49 ctx = container_of(ref, struct hl_ctx, refcount);
54 hl_hpriv_put(ctx->hpriv);
59 int hl_ctx_create(struct hl_device *hdev, struct hl_fpriv *hpriv)
61 struct hl_ctx_mgr *mgr = &hpriv->ctx_mgr;
65 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
71 mutex_lock(&mgr->ctx_lock);
72 rc = idr_alloc(&mgr->ctx_handles, ctx, 1, 0, GFP_KERNEL);
73 mutex_unlock(&mgr->ctx_lock);
76 dev_err(hdev->dev, "Failed to allocate IDR for a new CTX\n");
82 rc = hl_ctx_init(hdev, ctx, false);
89 /* TODO: remove for multiple contexts per process */
92 /* TODO: remove the following line for multiple process support */
93 hdev->compute_ctx = ctx;
98 mutex_lock(&mgr->ctx_lock);
99 idr_remove(&mgr->ctx_handles, ctx->handle);
100 mutex_unlock(&mgr->ctx_lock);
107 void hl_ctx_free(struct hl_device *hdev, struct hl_ctx *ctx)
109 if (kref_put(&ctx->refcount, hl_ctx_do_release) == 1)
113 "Context %d closed or terminated but its CS are executing\n",
117 int hl_ctx_init(struct hl_device *hdev, struct hl_ctx *ctx, bool is_kernel_ctx)
123 kref_init(&ctx->refcount);
125 ctx->cs_sequence = 1;
126 spin_lock_init(&ctx->cs_lock);
127 atomic_set(&ctx->thread_ctx_switch_token, 1);
128 ctx->thread_ctx_switch_wait_token = 0;
131 ctx->asid = HL_KERNEL_ASID_ID; /* Kernel driver gets ASID 0 */
132 rc = hl_mmu_ctx_init(ctx);
134 dev_err(hdev->dev, "Failed to init mmu ctx module\n");
138 ctx->asid = hl_asid_alloc(hdev);
140 dev_err(hdev->dev, "No free ASID, failed to create context\n");
144 rc = hl_vm_ctx_init(ctx);
146 dev_err(hdev->dev, "Failed to init mem ctx module\n");
155 if (ctx->asid != HL_KERNEL_ASID_ID)
156 hl_asid_free(hdev, ctx->asid);
161 void hl_ctx_get(struct hl_device *hdev, struct hl_ctx *ctx)
163 kref_get(&ctx->refcount);
166 int hl_ctx_put(struct hl_ctx *ctx)
168 return kref_put(&ctx->refcount, hl_ctx_do_release);
171 struct dma_fence *hl_ctx_get_fence(struct hl_ctx *ctx, u64 seq)
173 struct hl_device *hdev = ctx->hdev;
174 struct dma_fence *fence;
176 spin_lock(&ctx->cs_lock);
178 if (seq >= ctx->cs_sequence) {
179 dev_notice(hdev->dev,
180 "Can't wait on seq %llu because current CS is at seq %llu\n",
181 seq, ctx->cs_sequence);
182 spin_unlock(&ctx->cs_lock);
183 return ERR_PTR(-EINVAL);
187 if (seq + HL_MAX_PENDING_CS < ctx->cs_sequence) {
189 "Can't wait on seq %llu because current CS is at seq %llu (Fence is gone)\n",
190 seq, ctx->cs_sequence);
191 spin_unlock(&ctx->cs_lock);
195 fence = dma_fence_get(
196 ctx->cs_pending[seq & (HL_MAX_PENDING_CS - 1)]);
197 spin_unlock(&ctx->cs_lock);
203 * hl_ctx_mgr_init - initialize the context manager
205 * @mgr: pointer to context manager structure
207 * This manager is an object inside the hpriv object of the user process.
208 * The function is called when a user process opens the FD.
210 void hl_ctx_mgr_init(struct hl_ctx_mgr *mgr)
212 mutex_init(&mgr->ctx_lock);
213 idr_init(&mgr->ctx_handles);
217 * hl_ctx_mgr_fini - finalize the context manager
219 * @hdev: pointer to device structure
220 * @mgr: pointer to context manager structure
222 * This function goes over all the contexts in the manager and frees them.
223 * It is called when a process closes the FD.
225 void hl_ctx_mgr_fini(struct hl_device *hdev, struct hl_ctx_mgr *mgr)
231 idp = &mgr->ctx_handles;
233 idr_for_each_entry(idp, ctx, id)
234 hl_ctx_free(hdev, ctx);
236 idr_destroy(&mgr->ctx_handles);
237 mutex_destroy(&mgr->ctx_lock);