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) {
30 * The engines are stopped as there is no executing CS, but the
31 * Coresight might be still working by accessing addresses
32 * related to the stopped engines. Hence stop it explicitly.
35 hl_device_set_debug_mode(hdev, false);
38 hl_asid_free(hdev, ctx->asid);
44 void hl_ctx_do_release(struct kref *ref)
48 ctx = container_of(ref, struct hl_ctx, refcount);
53 hl_hpriv_put(ctx->hpriv);
58 int hl_ctx_create(struct hl_device *hdev, struct hl_fpriv *hpriv)
60 struct hl_ctx_mgr *mgr = &hpriv->ctx_mgr;
64 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
70 rc = hl_ctx_init(hdev, ctx, false);
77 /* TODO: remove for multiple contexts */
81 mutex_lock(&mgr->ctx_lock);
82 rc = idr_alloc(&mgr->ctx_handles, ctx, 1, 0, GFP_KERNEL);
83 mutex_unlock(&mgr->ctx_lock);
86 dev_err(hdev->dev, "Failed to allocate IDR for a new CTX\n");
87 hl_ctx_free(hdev, ctx);
99 void hl_ctx_free(struct hl_device *hdev, struct hl_ctx *ctx)
101 if (kref_put(&ctx->refcount, hl_ctx_do_release) == 1)
105 "Context %d closed or terminated but its CS are executing\n",
109 int hl_ctx_init(struct hl_device *hdev, struct hl_ctx *ctx, bool is_kernel_ctx)
115 kref_init(&ctx->refcount);
117 ctx->cs_sequence = 1;
118 spin_lock_init(&ctx->cs_lock);
119 atomic_set(&ctx->thread_ctx_switch_token, 1);
120 ctx->thread_ctx_switch_wait_token = 0;
123 ctx->asid = HL_KERNEL_ASID_ID; /* KMD gets ASID 0 */
124 rc = hl_mmu_ctx_init(ctx);
126 dev_err(hdev->dev, "Failed to init mmu ctx module\n");
130 ctx->asid = hl_asid_alloc(hdev);
132 dev_err(hdev->dev, "No free ASID, failed to create context\n");
136 rc = hl_vm_ctx_init(ctx);
138 dev_err(hdev->dev, "Failed to init mem ctx module\n");
147 if (ctx->asid != HL_KERNEL_ASID_ID)
148 hl_asid_free(hdev, ctx->asid);
153 void hl_ctx_get(struct hl_device *hdev, struct hl_ctx *ctx)
155 kref_get(&ctx->refcount);
158 int hl_ctx_put(struct hl_ctx *ctx)
160 return kref_put(&ctx->refcount, hl_ctx_do_release);
163 struct dma_fence *hl_ctx_get_fence(struct hl_ctx *ctx, u64 seq)
165 struct hl_device *hdev = ctx->hdev;
166 struct dma_fence *fence;
168 spin_lock(&ctx->cs_lock);
170 if (seq >= ctx->cs_sequence) {
171 dev_notice(hdev->dev,
172 "Can't wait on seq %llu because current CS is at seq %llu\n",
173 seq, ctx->cs_sequence);
174 spin_unlock(&ctx->cs_lock);
175 return ERR_PTR(-EINVAL);
179 if (seq + HL_MAX_PENDING_CS < ctx->cs_sequence) {
181 "Can't wait on seq %llu because current CS is at seq %llu (Fence is gone)\n",
182 seq, ctx->cs_sequence);
183 spin_unlock(&ctx->cs_lock);
187 fence = dma_fence_get(
188 ctx->cs_pending[seq & (HL_MAX_PENDING_CS - 1)]);
189 spin_unlock(&ctx->cs_lock);
195 * hl_ctx_mgr_init - initialize the context manager
197 * @mgr: pointer to context manager structure
199 * This manager is an object inside the hpriv object of the user process.
200 * The function is called when a user process opens the FD.
202 void hl_ctx_mgr_init(struct hl_ctx_mgr *mgr)
204 mutex_init(&mgr->ctx_lock);
205 idr_init(&mgr->ctx_handles);
209 * hl_ctx_mgr_fini - finalize the context manager
211 * @hdev: pointer to device structure
212 * @mgr: pointer to context manager structure
214 * This function goes over all the contexts in the manager and frees them.
215 * It is called when a process closes the FD.
217 void hl_ctx_mgr_fini(struct hl_device *hdev, struct hl_ctx_mgr *mgr)
223 idp = &mgr->ctx_handles;
225 idr_for_each_entry(idp, ctx, id)
226 hl_ctx_free(hdev, ctx);
228 idr_destroy(&mgr->ctx_handles);
229 mutex_destroy(&mgr->ctx_lock);