drm/ttm: Replace multiple booleans with flags in pool init

Multiple consecutive boolean function arguments are usually not very
readable.

Replace the ones in ttm_pool_init() with flags with the additional
benefit of soon being able to pass in more data with just this one
code base churning cost.

Signed-off-by: Tvrtko Ursulin <[e-mail]>
Cc: Alex Deucher <[e-mail]>
Cc: Christian König <[e-mail]>
Cc: Thomas Hellström <[e-mail]>
Reviewed-by: Christian König <[e-mail]>
Signed-off-by: Tvrtko Ursulin <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c

···
 	for (i = 0; i < adev->gmc.num_mem_partitions; i++) {
 		ttm_pool_init(&adev->mman.ttm_pools[i], adev->dev,
 			      adev->gmc.mem_partitions[i].numa.node,
-			      false, false);
+			      0);
 	}
 	return 0;
 }

drivers/gpu/drm/ttm/tests/ttm_device_test.c

···
 #include <drm/ttm/ttm_placement.h>
 
 #include "ttm_kunit_helpers.h"
+#include "../ttm_pool_internal.h"
 
 struct ttm_device_test_case {
 	const char *description;
-	bool use_dma_alloc;
-	bool use_dma32;
+	unsigned int alloc_flags;
 	bool pools_init_expected;
 };
 
···
 static const struct ttm_device_test_case ttm_device_cases[] = {
 	{
 		.description = "No DMA allocations, no DMA32 required",
-		.use_dma_alloc = false,
-		.use_dma32 = false,
 		.pools_init_expected = false,
 	},
 	{
 		.description = "DMA allocations, DMA32 required",
-		.use_dma_alloc = true,
-		.use_dma32 = true,
+		.alloc_flags = TTM_ALLOCATION_POOL_USE_DMA_ALLOC |
+			       TTM_ALLOCATION_POOL_USE_DMA32,
 		.pools_init_expected = true,
 	},
 	{
 		.description = "No DMA allocations, DMA32 required",
-		.use_dma_alloc = false,
-		.use_dma32 = true,
+		.alloc_flags = TTM_ALLOCATION_POOL_USE_DMA32,
 		.pools_init_expected = false,
 	},
 	{
 		.description = "DMA allocations, no DMA32 required",
-		.use_dma_alloc = true,
-		.use_dma32 = false,
+		.alloc_flags = TTM_ALLOCATION_POOL_USE_DMA_ALLOC,
 		.pools_init_expected = true,
 	},
 };
···
 	KUNIT_ASSERT_NOT_NULL(test, ttm_dev);
 
 	err = ttm_device_kunit_init(priv, ttm_dev,
-				    params->use_dma_alloc,
-				    params->use_dma32);
+				    params->alloc_flags & TTM_ALLOCATION_POOL_USE_DMA_ALLOC,
+				    params->alloc_flags & TTM_ALLOCATION_POOL_USE_DMA32);
 	KUNIT_ASSERT_EQ(test, err, 0);
 
 	pool = &ttm_dev->pool;
 	KUNIT_ASSERT_NOT_NULL(test, pool);
 	KUNIT_EXPECT_PTR_EQ(test, pool->dev, priv->dev);
-	KUNIT_EXPECT_EQ(test, pool->use_dma_alloc, params->use_dma_alloc);
-	KUNIT_EXPECT_EQ(test, pool->use_dma32, params->use_dma32);
+	KUNIT_EXPECT_EQ(test, pool->alloc_flags, params->alloc_flags);
 
 	if (params->pools_init_expected) {
 		for (int i = 0; i < TTM_NUM_CACHING_TYPES; ++i) {
···
 				KUNIT_EXPECT_EQ(test, pt.caching, i);
 				KUNIT_EXPECT_EQ(test, pt.order, j);
 
-				if (params->use_dma_alloc)
+				if (ttm_pool_uses_dma_alloc(pool))
 					KUNIT_ASSERT_FALSE(test,
 							   list_empty(&pt.pages));
 			}

drivers/gpu/drm/ttm/tests/ttm_pool_test.c

···
 struct ttm_pool_test_case {
 	const char *description;
 	unsigned int order;
-	bool use_dma_alloc;
+	unsigned int alloc_flags;
 };
 
 struct ttm_pool_test_priv {
···
 	pool = kunit_kzalloc(test, sizeof(*pool), GFP_KERNEL);
 	KUNIT_ASSERT_NOT_NULL(test, pool);
 
-	ttm_pool_init(pool, devs->dev, NUMA_NO_NODE, true, false);
+	ttm_pool_init(pool, devs->dev, NUMA_NO_NODE, TTM_ALLOCATION_POOL_USE_DMA_ALLOC);
 
 	err = ttm_pool_alloc(pool, tt, &simple_ctx);
 	KUNIT_ASSERT_EQ(test, err, 0);
···
 	{
 		.description = "One page, with coherent DMA mappings enabled",
 		.order = 0,
-		.use_dma_alloc = true,
+		.alloc_flags = TTM_ALLOCATION_POOL_USE_DMA_ALLOC,
 	},
 	{
 		.description = "Above the allocation limit, with coherent DMA mappings enabled",
 		.order = MAX_PAGE_ORDER + 1,
-		.use_dma_alloc = true,
+		.alloc_flags = TTM_ALLOCATION_POOL_USE_DMA_ALLOC,
 	},
 };
 
···
 	pool = kunit_kzalloc(test, sizeof(*pool), GFP_KERNEL);
 	KUNIT_ASSERT_NOT_NULL(test, pool);
 
-	ttm_pool_init(pool, devs->dev, NUMA_NO_NODE, params->use_dma_alloc,
-		      false);
+	ttm_pool_init(pool, devs->dev, NUMA_NO_NODE, params->alloc_flags);
 
 	KUNIT_ASSERT_PTR_EQ(test, pool->dev, devs->dev);
 	KUNIT_ASSERT_EQ(test, pool->nid, NUMA_NO_NODE);
-	KUNIT_ASSERT_EQ(test, ttm_pool_uses_dma_alloc(pool),
-			params->use_dma_alloc);
+	KUNIT_ASSERT_EQ(test, pool->alloc_flags, params->alloc_flags);
 
 	err = ttm_pool_alloc(pool, tt, &simple_ctx);
 	KUNIT_ASSERT_EQ(test, err, 0);
···
 	last_page = tt->pages[tt->num_pages - 1];
 
 	if (params->order <= MAX_PAGE_ORDER) {
-		if (params->use_dma_alloc) {
+		if (ttm_pool_uses_dma_alloc(pool)) {
 			KUNIT_ASSERT_NOT_NULL(test, (void *)fst_page->private);
 			KUNIT_ASSERT_NOT_NULL(test, (void *)last_page->private);
 		} else {
 			KUNIT_ASSERT_EQ(test, fst_page->private, params->order);
 		}
 	} else {
-		if (params->use_dma_alloc) {
+		if (ttm_pool_uses_dma_alloc(pool)) {
 			KUNIT_ASSERT_NOT_NULL(test, (void *)fst_page->private);
 			KUNIT_ASSERT_NULL(test, (void *)last_page->private);
 		} else {
···
 	pool = kunit_kzalloc(test, sizeof(*pool), GFP_KERNEL);
 	KUNIT_ASSERT_NOT_NULL(test, pool);
 
-	ttm_pool_init(pool, devs->dev, NUMA_NO_NODE, true, false);
+	ttm_pool_init(pool, devs->dev, NUMA_NO_NODE, TTM_ALLOCATION_POOL_USE_DMA_ALLOC);
 
 	err = ttm_pool_alloc(pool, tt, &simple_ctx);
 	KUNIT_ASSERT_EQ(test, err, 0);
···
 	pool = kunit_kzalloc(test, sizeof(*pool), GFP_KERNEL);
 	KUNIT_ASSERT_NOT_NULL(test, pool);
 
-	ttm_pool_init(pool, devs->dev, NUMA_NO_NODE, true, false);
+	ttm_pool_init(pool, devs->dev, NUMA_NO_NODE, TTM_ALLOCATION_POOL_USE_DMA_ALLOC);
 	ttm_pool_alloc(pool, tt, &simple_ctx);
 
 	pt = &pool->caching[caching].orders[order];
···
 	pool = kunit_kzalloc(test, sizeof(*pool), GFP_KERNEL);
 	KUNIT_ASSERT_NOT_NULL(test, pool);
 
-	ttm_pool_init(pool, devs->dev, NUMA_NO_NODE, false, false);
+	ttm_pool_init(pool, devs->dev, NUMA_NO_NODE, 0);
 	ttm_pool_alloc(pool, tt, &simple_ctx);
 
 	pt = &pool->caching[caching].orders[order];

drivers/gpu/drm/ttm/ttm_device.c

···
 #include <linux/export.h>
 #include <linux/mm.h>
 
+#include <drm/ttm/ttm_allocation.h>
 #include <drm/ttm/ttm_bo.h>
 #include <drm/ttm/ttm_device.h>
 #include <drm/ttm/ttm_tt.h>
···
 	else
 		nid = NUMA_NO_NODE;
 
-	ttm_pool_init(&bdev->pool, dev, nid, use_dma_alloc, use_dma32);
+	ttm_pool_init(&bdev->pool, dev, nid,
+		      (use_dma_alloc ? TTM_ALLOCATION_POOL_USE_DMA_ALLOC : 0) |
+		      (use_dma32 ? TTM_ALLOCATION_POOL_USE_DMA32 : 0));
 
 	bdev->vma_manager = vma_manager;
 	spin_lock_init(&bdev->lru_lock);

drivers/gpu/drm/ttm/ttm_pool.c

···
  * @pool: the pool to initialize
  * @dev: device for DMA allocations and mappings
  * @nid: NUMA node to use for allocations
- * @use_dma_alloc: true if coherent DMA alloc should be used
- * @use_dma32: true if GFP_DMA32 should be used
+ * @alloc_flags: TTM_ALLOCATION_POOL_ flags
  *
  * Initialize the pool and its pool types.
  */
 void ttm_pool_init(struct ttm_pool *pool, struct device *dev,
-		   int nid, bool use_dma_alloc, bool use_dma32)
+		   int nid, unsigned int alloc_flags)
 {
 	unsigned int i, j;
 
···
 
 	pool->dev = dev;
 	pool->nid = nid;
-	pool->use_dma_alloc = use_dma_alloc;
-	pool->use_dma32 = use_dma32;
+	pool->alloc_flags = alloc_flags;
 
 	for (i = 0; i < TTM_NUM_CACHING_TYPES; ++i) {
 		for (j = 0; j < NR_PAGE_ORDERS; ++j) {

drivers/gpu/drm/ttm/ttm_pool_internal.h

···
 #ifndef _TTM_POOL_INTERNAL_H_
 #define _TTM_POOL_INTERNAL_H_
 
+#include <drm/ttm/ttm_allocation.h>
 #include <drm/ttm/ttm_pool.h>
 
 static inline bool ttm_pool_uses_dma_alloc(struct ttm_pool *pool)
 {
-	return pool->use_dma_alloc;
+	return pool->alloc_flags & TTM_ALLOCATION_POOL_USE_DMA_ALLOC;
 }
 
 static inline bool ttm_pool_uses_dma32(struct ttm_pool *pool)
 {
-	return pool->use_dma32;
+	return pool->alloc_flags & TTM_ALLOCATION_POOL_USE_DMA32;
 }
 
 #endif

include/drm/ttm/ttm_allocation.h

···
+/* SPDX-License-Identifier: GPL-2.0 OR MIT */
+/* Copyright (c) 2025 Valve Corporation */
+
+#ifndef _TTM_ALLOCATION_H_
+#define _TTM_ALLOCATION_H_
+
+#define TTM_ALLOCATION_POOL_USE_DMA_ALLOC	BIT(0) /* Use coherent DMA allocations. */
+#define TTM_ALLOCATION_POOL_USE_DMA32		BIT(1) /* Use GFP_DMA32 allocations. */
+
+#endif

include/drm/ttm/ttm_pool.h

···
  *
  * @dev: the device we allocate pages for
  * @nid: which numa node to use
- * @use_dma_alloc: if coherent DMA allocations should be used
- * @use_dma32: if GFP_DMA32 should be used
+ * @alloc_flags: TTM_ALLOCATION_POOL_ flags
  * @caching: pools for each caching/order
  */
 struct ttm_pool {
 	struct device *dev;
 	int nid;
 
-	bool use_dma_alloc;
-	bool use_dma32;
+	unsigned int alloc_flags;
 
 	struct {
 		struct ttm_pool_type orders[NR_PAGE_ORDERS];
···
 void ttm_pool_free(struct ttm_pool *pool, struct ttm_tt *tt);
 
 void ttm_pool_init(struct ttm_pool *pool, struct device *dev,
-		   int nid, bool use_dma_alloc, bool use_dma32);
+		   int nid, unsigned int alloc_flags);
 void ttm_pool_fini(struct ttm_pool *pool);
 
 int ttm_pool_debugfs(struct ttm_pool *pool, struct seq_file *m);