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2024-10-12 a5969cabbb4660eab42b6ef0412cbbd1200cf14d 
 kernel/kernel/irq/affinity.c
....@@ -7,9 +7,10 @@
77 #include <linux/kernel.h>
88 #include <linux/slab.h>
99 #include <linux/cpu.h>
10
+#include <linux/sort.h>
1011 
1112 static void irq_spread_init_one(struct cpumask *irqmsk, struct cpumask *nmsk,
12
-				int cpus_per_vec)
13
+				unsigned int cpus_per_vec)
1314 {
1415 	const struct cpumask *siblmsk;
1516 	int cpu, sibl;
....@@ -94,17 +95,168 @@
9495 	return nodes;
9596 }
9697 
97
-static int irq_build_affinity_masks(const struct irq_affinity *affd,
98
-				    int startvec, int numvecs,
99
-				    cpumask_var_t *node_to_cpumask,
100
-				    const struct cpumask *cpu_mask,
101
-				    struct cpumask *nmsk,
102
-				    struct cpumask *masks)
98
+struct node_vectors {
99
+	unsigned id;
100
+
101
+	union {
102
+		unsigned nvectors;
103
+		unsigned ncpus;
104
+	};
105
+};
106
+
107
+static int ncpus_cmp_func(const void *l, const void *r)
103108 {
104
-	int n, nodes, cpus_per_vec, extra_vecs, done = 0;
105
-	int last_affv = affd->pre_vectors + numvecs;
106
-	int curvec = startvec;
109
+	const struct node_vectors *ln = l;
110
+	const struct node_vectors *rn = r;
111
+
112
+	return ln->ncpus - rn->ncpus;
113
+}
114
+
115
+/*
116
+ * Allocate vector number for each node, so that for each node:
117
+ *
118
+ * 1) the allocated number is >= 1
119
+ *
120
+ * 2) the allocated numbver is <= active CPU number of this node
121
+ *
122
+ * The actual allocated total vectors may be less than @numvecs when
123
+ * active total CPU number is less than @numvecs.
124
+ *
125
+ * Active CPUs means the CPUs in '@cpu_mask AND @node_to_cpumask[]'
126
+ * for each node.
127
+ */
128
+static void alloc_nodes_vectors(unsigned int numvecs,
129
+				cpumask_var_t *node_to_cpumask,
130
+				const struct cpumask *cpu_mask,
131
+				const nodemask_t nodemsk,
132
+				struct cpumask *nmsk,
133
+				struct node_vectors *node_vectors)
134
+{
135
+	unsigned n, remaining_ncpus = 0;
136
+
137
+	for (n = 0; n < nr_node_ids; n++) {
138
+		node_vectors[n].id = n;
139
+		node_vectors[n].ncpus = UINT_MAX;
140
+	}
141
+
142
+	for_each_node_mask(n, nodemsk) {
143
+		unsigned ncpus;
144
+
145
+		cpumask_and(nmsk, cpu_mask, node_to_cpumask[n]);
146
+		ncpus = cpumask_weight(nmsk);
147
+
148
+		if (!ncpus)
149
+			continue;
150
+		remaining_ncpus += ncpus;
151
+		node_vectors[n].ncpus = ncpus;
152
+	}
153
+
154
+	numvecs = min_t(unsigned, remaining_ncpus, numvecs);
155
+
156
+	sort(node_vectors, nr_node_ids, sizeof(node_vectors[0]),
157
+	     ncpus_cmp_func, NULL);
158
+
159
+	/*
160
+	 * Allocate vectors for each node according to the ratio of this
161
+	 * node's nr_cpus to remaining un-assigned ncpus. 'numvecs' is
162
+	 * bigger than number of active numa nodes. Always start the
163
+	 * allocation from the node with minimized nr_cpus.
164
+	 *
165
+	 * This way guarantees that each active node gets allocated at
166
+	 * least one vector, and the theory is simple: over-allocation
167
+	 * is only done when this node is assigned by one vector, so
168
+	 * other nodes will be allocated >= 1 vector, since 'numvecs' is
169
+	 * bigger than number of numa nodes.
170
+	 *
171
+	 * One perfect invariant is that number of allocated vectors for
172
+	 * each node is <= CPU count of this node:
173
+	 *
174
+	 * 1) suppose there are two nodes: A and B
175
+	 * 	ncpu(X) is CPU count of node X
176
+	 * 	vecs(X) is the vector count allocated to node X via this
177
+	 * 	algorithm
178
+	 *
179
+	 * 	ncpu(A) <= ncpu(B)
180
+	 * 	ncpu(A) + ncpu(B) = N
181
+	 * 	vecs(A) + vecs(B) = V
182
+	 *
183
+	 * 	vecs(A) = max(1, round_down(V * ncpu(A) / N))
184
+	 * 	vecs(B) = V - vecs(A)
185
+	 *
186
+	 * 	both N and V are integer, and 2 <= V <= N, suppose
187
+	 * 	V = N - delta, and 0 <= delta <= N - 2
188
+	 *
189
+	 * 2) obviously vecs(A) <= ncpu(A) because:
190
+	 *
191
+	 * 	if vecs(A) is 1, then vecs(A) <= ncpu(A) given
192
+	 * 	ncpu(A) >= 1
193
+	 *
194
+	 * 	otherwise,
195
+	 * 		vecs(A) <= V * ncpu(A) / N <= ncpu(A), given V <= N
196
+	 *
197
+	 * 3) prove how vecs(B) <= ncpu(B):
198
+	 *
199
+	 * 	if round_down(V * ncpu(A) / N) == 0, vecs(B) won't be
200
+	 * 	over-allocated, so vecs(B) <= ncpu(B),
201
+	 *
202
+	 * 	otherwise:
203
+	 *
204
+	 * 	vecs(A) =
205
+	 * 		round_down(V * ncpu(A) / N) =
206
+	 * 		round_down((N - delta) * ncpu(A) / N) =
207
+	 * 		round_down((N * ncpu(A) - delta * ncpu(A)) / N)	 >=
208
+	 * 		round_down((N * ncpu(A) - delta * N) / N)	 =
209
+	 * 		cpu(A) - delta
210
+	 *
211
+	 * 	then:
212
+	 *
213
+	 * 	vecs(A) - V >= ncpu(A) - delta - V
214
+	 * 	=>
215
+	 * 	V - vecs(A) <= V + delta - ncpu(A)
216
+	 * 	=>
217
+	 * 	vecs(B) <= N - ncpu(A)
218
+	 * 	=>
219
+	 * 	vecs(B) <= cpu(B)
220
+	 *
221
+	 * For nodes >= 3, it can be thought as one node and another big
222
+	 * node given that is exactly what this algorithm is implemented,
223
+	 * and we always re-calculate 'remaining_ncpus' & 'numvecs', and
224
+	 * finally for each node X: vecs(X) <= ncpu(X).
225
+	 *
226
+	 */
227
+	for (n = 0; n < nr_node_ids; n++) {
228
+		unsigned nvectors, ncpus;
229
+
230
+		if (node_vectors[n].ncpus == UINT_MAX)
231
+			continue;
232
+
233
+		WARN_ON_ONCE(numvecs == 0);
234
+
235
+		ncpus = node_vectors[n].ncpus;
236
+		nvectors = max_t(unsigned, 1,
237
+				 numvecs * ncpus / remaining_ncpus);
238
+		WARN_ON_ONCE(nvectors > ncpus);
239
+
240
+		node_vectors[n].nvectors = nvectors;
241
+
242
+		remaining_ncpus -= ncpus;
243
+		numvecs -= nvectors;
244
+	}
245
+}
246
+
247
+static int __irq_build_affinity_masks(unsigned int startvec,
248
+				      unsigned int numvecs,
249
+				      unsigned int firstvec,
250
+				      cpumask_var_t *node_to_cpumask,
251
+				      const struct cpumask *cpu_mask,
252
+				      struct cpumask *nmsk,
253
+				      struct irq_affinity_desc *masks)
254
+{
255
+	unsigned int i, n, nodes, cpus_per_vec, extra_vecs, done = 0;
256
+	unsigned int last_affv = firstvec + numvecs;
257
+	unsigned int curvec = startvec;
107258 	nodemask_t nodemsk = NODE_MASK_NONE;
259
+	struct node_vectors *node_vectors;
108260 
109261 	if (!cpumask_weight(cpu_mask))
110262 		return 0;
....@@ -117,102 +269,103 @@
117269 	 */
118270 	if (numvecs <= nodes) {
119271 		for_each_node_mask(n, nodemsk) {
120
-			cpumask_or(masks + curvec, masks + curvec, node_to_cpumask[n]);
272
+			/* Ensure that only CPUs which are in both masks are set */
273
+			cpumask_and(nmsk, cpu_mask, node_to_cpumask[n]);
274
+			cpumask_or(&masks[curvec].mask, &masks[curvec].mask, nmsk);
121275 			if (++curvec == last_affv)
122
-				curvec = affd->pre_vectors;
276
+				curvec = firstvec;
123277 		}
124
-		done = numvecs;
125
-		goto out;
278
+		return numvecs;
126279 	}
127280 
128
-	for_each_node_mask(n, nodemsk) {
129
-		int ncpus, v, vecs_to_assign, vecs_per_node;
281
+	node_vectors = kcalloc(nr_node_ids,
282
+			       sizeof(struct node_vectors),
283
+			       GFP_KERNEL);
284
+	if (!node_vectors)
285
+		return -ENOMEM;
130286 
131
-		/* Spread the vectors per node */
132
-		vecs_per_node = (numvecs - (curvec - affd->pre_vectors)) / nodes;
287
+	/* allocate vector number for each node */
288
+	alloc_nodes_vectors(numvecs, node_to_cpumask, cpu_mask,
289
+			    nodemsk, nmsk, node_vectors);
290
+
291
+	for (i = 0; i < nr_node_ids; i++) {
292
+		unsigned int ncpus, v;
293
+		struct node_vectors *nv = &node_vectors[i];
294
+
295
+		if (nv->nvectors == UINT_MAX)
296
+			continue;
133297 
134298 		/* Get the cpus on this node which are in the mask */
135
-		cpumask_and(nmsk, cpu_mask, node_to_cpumask[n]);
136
-
137
-		/* Calculate the number of cpus per vector */
299
+		cpumask_and(nmsk, cpu_mask, node_to_cpumask[nv->id]);
138300 		ncpus = cpumask_weight(nmsk);
139
-		vecs_to_assign = min(vecs_per_node, ncpus);
301
+		if (!ncpus)
302
+			continue;
303
+
304
+		WARN_ON_ONCE(nv->nvectors > ncpus);
140305 
141306 		/* Account for rounding errors */
142
-		extra_vecs = ncpus - vecs_to_assign * (ncpus / vecs_to_assign);
307
+		extra_vecs = ncpus - nv->nvectors * (ncpus / nv->nvectors);
143308 
144
-		for (v = 0; curvec < last_affv && v < vecs_to_assign;
145
-		     curvec++, v++) {
146
-			cpus_per_vec = ncpus / vecs_to_assign;
309
+		/* Spread allocated vectors on CPUs of the current node */
310
+		for (v = 0; v < nv->nvectors; v++, curvec++) {
311
+			cpus_per_vec = ncpus / nv->nvectors;
147312 
148313 			/* Account for extra vectors to compensate rounding errors */
149314 			if (extra_vecs) {
150315 				cpus_per_vec++;
151316 				--extra_vecs;
152317 			}
153
-			irq_spread_init_one(masks + curvec, nmsk, cpus_per_vec);
318
+
319
+			/*
320
+			 * wrapping has to be considered given 'startvec'
321
+			 * may start anywhere
322
+			 */
323
+			if (curvec >= last_affv)
324
+				curvec = firstvec;
325
+			irq_spread_init_one(&masks[curvec].mask, nmsk,
326
+						cpus_per_vec);
154327 		}
155
-
156
-		done += v;
157
-		if (done >= numvecs)
158
-			break;
159
-		if (curvec >= last_affv)
160
-			curvec = affd->pre_vectors;
161
-		--nodes;
328
+		done += nv->nvectors;
162329 	}
163
-
164
-out:
330
+	kfree(node_vectors);
165331 	return done;
166332 }
167333 
168
-/**
169
- * irq_create_affinity_masks - Create affinity masks for multiqueue spreading
170
- * @nvecs:	The total number of vectors
171
- * @affd:	Description of the affinity requirements
172
- *
173
- * Returns the masks pointer or NULL if allocation failed.
334
+/*
335
+ * build affinity in two stages:
336
+ *	1) spread present CPU on these vectors
337
+ *	2) spread other possible CPUs on these vectors
174338  */
175
-struct cpumask *
176
-irq_create_affinity_masks(int nvecs, const struct irq_affinity *affd)
339
+static int irq_build_affinity_masks(unsigned int startvec, unsigned int numvecs,
340
+				    unsigned int firstvec,
341
+				    struct irq_affinity_desc *masks)
177342 {
178
-	int affvecs = nvecs - affd->pre_vectors - affd->post_vectors;
179
-	int curvec, usedvecs;
180
-	cpumask_var_t nmsk, npresmsk, *node_to_cpumask;
181
-	struct cpumask *masks = NULL;
182
-
183
-	/*
184
-	 * If there aren't any vectors left after applying the pre/post
185
-	 * vectors don't bother with assigning affinity.
186
-	 */
187
-	if (nvecs == affd->pre_vectors + affd->post_vectors)
188
-		return NULL;
343
+	unsigned int curvec = startvec, nr_present = 0, nr_others = 0;
344
+	cpumask_var_t *node_to_cpumask;
345
+	cpumask_var_t nmsk, npresmsk;
346
+	int ret = -ENOMEM;
189347 
190348 	if (!zalloc_cpumask_var(&nmsk, GFP_KERNEL))
191
-		return NULL;
349
+		return ret;
192350 
193351 	if (!zalloc_cpumask_var(&npresmsk, GFP_KERNEL))
194
-		goto outcpumsk;
352
+		goto fail_nmsk;
195353 
196354 	node_to_cpumask = alloc_node_to_cpumask();
197355 	if (!node_to_cpumask)
198
-		goto outnpresmsk;
199
-
200
-	masks = kcalloc(nvecs, sizeof(*masks), GFP_KERNEL);
201
-	if (!masks)
202
-		goto outnodemsk;
203
-
204
-	/* Fill out vectors at the beginning that don't need affinity */
205
-	for (curvec = 0; curvec < affd->pre_vectors; curvec++)
206
-		cpumask_copy(masks + curvec, irq_default_affinity);
356
+		goto fail_npresmsk;
207357 
208358 	/* Stabilize the cpumasks */
209359 	get_online_cpus();
210360 	build_node_to_cpumask(node_to_cpumask);
211361 
212362 	/* Spread on present CPUs starting from affd->pre_vectors */
213
-	usedvecs = irq_build_affinity_masks(affd, curvec, affvecs,
214
-					    node_to_cpumask, cpu_present_mask,
215
-					    nmsk, masks);
363
+	ret = __irq_build_affinity_masks(curvec, numvecs, firstvec,
364
+					 node_to_cpumask, cpu_present_mask,
365
+					 nmsk, masks);
366
+	if (ret < 0)
367
+		goto fail_build_affinity;
368
+	nr_present = ret;
216369 
217370 	/*
218371 	 * Spread on non present CPUs starting from the next vector to be
....@@ -220,15 +373,105 @@
220373 	 * vector space, assign the non present CPUs to the already spread
221374 	 * out vectors.
222375 	 */
223
-	if (usedvecs >= affvecs)
224
-		curvec = affd->pre_vectors;
376
+	if (nr_present >= numvecs)
377
+		curvec = firstvec;
225378 	else
226
-		curvec = affd->pre_vectors + usedvecs;
379
+		curvec = firstvec + nr_present;
227380 	cpumask_andnot(npresmsk, cpu_possible_mask, cpu_present_mask);
228
-	usedvecs += irq_build_affinity_masks(affd, curvec, affvecs,
229
-					     node_to_cpumask, npresmsk,
230
-					     nmsk, masks);
381
+	ret = __irq_build_affinity_masks(curvec, numvecs, firstvec,
382
+					 node_to_cpumask, npresmsk, nmsk,
383
+					 masks);
384
+	if (ret >= 0)
385
+		nr_others = ret;
386
+
387
+ fail_build_affinity:
231388 	put_online_cpus();
389
+
390
+	if (ret >= 0)
391
+		WARN_ON(nr_present + nr_others < numvecs);
392
+
393
+	free_node_to_cpumask(node_to_cpumask);
394
+
395
+ fail_npresmsk:
396
+	free_cpumask_var(npresmsk);
397
+
398
+ fail_nmsk:
399
+	free_cpumask_var(nmsk);
400
+	return ret < 0 ? ret : 0;
401
+}
402
+
403
+static void default_calc_sets(struct irq_affinity *affd, unsigned int affvecs)
404
+{
405
+	affd->nr_sets = 1;
406
+	affd->set_size[0] = affvecs;
407
+}
408
+
409
+/**
410
+ * irq_create_affinity_masks - Create affinity masks for multiqueue spreading
411
+ * @nvecs:	The total number of vectors
412
+ * @affd:	Description of the affinity requirements
413
+ *
414
+ * Returns the irq_affinity_desc pointer or NULL if allocation failed.
415
+ */
416
+struct irq_affinity_desc *
417
+irq_create_affinity_masks(unsigned int nvecs, struct irq_affinity *affd)
418
+{
419
+	unsigned int affvecs, curvec, usedvecs, i;
420
+	struct irq_affinity_desc *masks = NULL;
421
+
422
+	/*
423
+	 * Determine the number of vectors which need interrupt affinities
424
+	 * assigned. If the pre/post request exhausts the available vectors
425
+	 * then nothing to do here except for invoking the calc_sets()
426
+	 * callback so the device driver can adjust to the situation.
427
+	 */
428
+	if (nvecs > affd->pre_vectors + affd->post_vectors)
429
+		affvecs = nvecs - affd->pre_vectors - affd->post_vectors;
430
+	else
431
+		affvecs = 0;
432
+
433
+	/*
434
+	 * Simple invocations do not provide a calc_sets() callback. Install
435
+	 * the generic one.
436
+	 */
437
+	if (!affd->calc_sets)
438
+		affd->calc_sets = default_calc_sets;
439
+
440
+	/* Recalculate the sets */
441
+	affd->calc_sets(affd, affvecs);
442
+
443
+	if (WARN_ON_ONCE(affd->nr_sets > IRQ_AFFINITY_MAX_SETS))
444
+		return NULL;
445
+
446
+	/* Nothing to assign? */
447
+	if (!affvecs)
448
+		return NULL;
449
+
450
+	masks = kcalloc(nvecs, sizeof(*masks), GFP_KERNEL);
451
+	if (!masks)
452
+		return NULL;
453
+
454
+	/* Fill out vectors at the beginning that don't need affinity */
455
+	for (curvec = 0; curvec < affd->pre_vectors; curvec++)
456
+		cpumask_copy(&masks[curvec].mask, irq_default_affinity);
457
+
458
+	/*
459
+	 * Spread on present CPUs starting from affd->pre_vectors. If we
460
+	 * have multiple sets, build each sets affinity mask separately.
461
+	 */
462
+	for (i = 0, usedvecs = 0; i < affd->nr_sets; i++) {
463
+		unsigned int this_vecs = affd->set_size[i];
464
+		int ret;
465
+
466
+		ret = irq_build_affinity_masks(curvec, this_vecs,
467
+					       curvec, masks);
468
+		if (ret) {
469
+			kfree(masks);
470
+			return NULL;
471
+		}
472
+		curvec += this_vecs;
473
+		usedvecs += this_vecs;
474
+	}
232475 
233476 	/* Fill out vectors at the end that don't need affinity */
234477 	if (usedvecs >= affvecs)
....@@ -236,14 +479,12 @@
236479 	else
237480 		curvec = affd->pre_vectors + usedvecs;
238481 	for (; curvec < nvecs; curvec++)
239
-		cpumask_copy(masks + curvec, irq_default_affinity);
482
+		cpumask_copy(&masks[curvec].mask, irq_default_affinity);
240483 
241
-outnodemsk:
242
-	free_node_to_cpumask(node_to_cpumask);
243
-outnpresmsk:
244
-	free_cpumask_var(npresmsk);
245
-outcpumsk:
246
-	free_cpumask_var(nmsk);
484
+	/* Mark the managed interrupts */
485
+	for (i = affd->pre_vectors; i < nvecs - affd->post_vectors; i++)
486
+		masks[i].is_managed = 1;
487
+
247488 	return masks;
248489 }
249490 
....@@ -253,17 +494,22 @@
253494  * @maxvec:	The maximum number of vectors available
254495  * @affd:	Description of the affinity requirements
255496  */
256
-int irq_calc_affinity_vectors(int minvec, int maxvec, const struct irq_affinity *affd)
497
+unsigned int irq_calc_affinity_vectors(unsigned int minvec, unsigned int maxvec,
498
+				       const struct irq_affinity *affd)
257499 {
258
-	int resv = affd->pre_vectors + affd->post_vectors;
259
-	int vecs = maxvec - resv;
260
-	int ret;
500
+	unsigned int resv = affd->pre_vectors + affd->post_vectors;
501
+	unsigned int set_vecs;
261502 
262503 	if (resv > minvec)
263504 		return 0;
264505 
265
-	get_online_cpus();
266
-	ret = min_t(int, cpumask_weight(cpu_possible_mask), vecs) + resv;
267
-	put_online_cpus();
268
-	return ret;
506
+	if (affd->calc_sets) {
507
+		set_vecs = maxvec - resv;
508
+	} else {
509
+		get_online_cpus();
510
+		set_vecs = cpumask_weight(cpu_possible_mask);
511
+		put_online_cpus();
512
+	}
513
+
514
+	return resv + min(set_vecs, maxvec - resv);
269515 }