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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c 
 kernel/arch/nds32/kernel/dma.c
....@@ -3,326 +3,12 @@
33 
44 #include <linux/types.h>
55 #include <linux/mm.h>
6
-#include <linux/string.h>
7
-#include <linux/dma-noncoherent.h>
8
-#include <linux/io.h>
6
+#include <linux/dma-map-ops.h>
97 #include <linux/cache.h>
108 #include <linux/highmem.h>
11
-#include <linux/slab.h>
129 #include <asm/cacheflush.h>
1310 #include <asm/tlbflush.h>
1411 #include <asm/proc-fns.h>
15
-
16
-/*
17
- * This is the page table (2MB) covering uncached, DMA consistent allocations
18
- */
19
-static pte_t *consistent_pte;
20
-static DEFINE_RAW_SPINLOCK(consistent_lock);
21
-
22
-/*
23
- * VM region handling support.
24
- *
25
- * This should become something generic, handling VM region allocations for
26
- * vmalloc and similar (ioremap, module space, etc).
27
- *
28
- * I envisage vmalloc()'s supporting vm_struct becoming:
29
- *
30
- *  struct vm_struct {
31
- *    struct vm_region	region;
32
- *    unsigned long	flags;
33
- *    struct page	**pages;
34
- *    unsigned int	nr_pages;
35
- *    unsigned long	phys_addr;
36
- *  };
37
- *
38
- * get_vm_area() would then call vm_region_alloc with an appropriate
39
- * struct vm_region head (eg):
40
- *
41
- *  struct vm_region vmalloc_head = {
42
- *	.vm_list	= LIST_HEAD_INIT(vmalloc_head.vm_list),
43
- *	.vm_start	= VMALLOC_START,
44
- *	.vm_end		= VMALLOC_END,
45
- *  };
46
- *
47
- * However, vmalloc_head.vm_start is variable (typically, it is dependent on
48
- * the amount of RAM found at boot time.)  I would imagine that get_vm_area()
49
- * would have to initialise this each time prior to calling vm_region_alloc().
50
- */
51
-struct arch_vm_region {
52
-	struct list_head vm_list;
53
-	unsigned long vm_start;
54
-	unsigned long vm_end;
55
-	struct page *vm_pages;
56
-};
57
-
58
-static struct arch_vm_region consistent_head = {
59
-	.vm_list = LIST_HEAD_INIT(consistent_head.vm_list),
60
-	.vm_start = CONSISTENT_BASE,
61
-	.vm_end = CONSISTENT_END,
62
-};
63
-
64
-static struct arch_vm_region *vm_region_alloc(struct arch_vm_region *head,
65
-					      size_t size, int gfp)
66
-{
67
-	unsigned long addr = head->vm_start, end = head->vm_end - size;
68
-	unsigned long flags;
69
-	struct arch_vm_region *c, *new;
70
-
71
-	new = kmalloc(sizeof(struct arch_vm_region), gfp);
72
-	if (!new)
73
-		goto out;
74
-
75
-	raw_spin_lock_irqsave(&consistent_lock, flags);
76
-
77
-	list_for_each_entry(c, &head->vm_list, vm_list) {
78
-		if ((addr + size) < addr)
79
-			goto nospc;
80
-		if ((addr + size) <= c->vm_start)
81
-			goto found;
82
-		addr = c->vm_end;
83
-		if (addr > end)
84
-			goto nospc;
85
-	}
86
-
87
-found:
88
-	/*
89
-	 * Insert this entry _before_ the one we found.
90
-	 */
91
-	list_add_tail(&new->vm_list, &c->vm_list);
92
-	new->vm_start = addr;
93
-	new->vm_end = addr + size;
94
-
95
-	raw_spin_unlock_irqrestore(&consistent_lock, flags);
96
-	return new;
97
-
98
-nospc:
99
-	raw_spin_unlock_irqrestore(&consistent_lock, flags);
100
-	kfree(new);
101
-out:
102
-	return NULL;
103
-}
104
-
105
-static struct arch_vm_region *vm_region_find(struct arch_vm_region *head,
106
-					     unsigned long addr)
107
-{
108
-	struct arch_vm_region *c;
109
-
110
-	list_for_each_entry(c, &head->vm_list, vm_list) {
111
-		if (c->vm_start == addr)
112
-			goto out;
113
-	}
114
-	c = NULL;
115
-out:
116
-	return c;
117
-}
118
-
119
-void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
120
-		gfp_t gfp, unsigned long attrs)
121
-{
122
-	struct page *page;
123
-	struct arch_vm_region *c;
124
-	unsigned long order;
125
-	u64 mask = ~0ULL, limit;
126
-	pgprot_t prot = pgprot_noncached(PAGE_KERNEL);
127
-
128
-	if (!consistent_pte) {
129
-		pr_err("%s: not initialized\n", __func__);
130
-		dump_stack();
131
-		return NULL;
132
-	}
133
-
134
-	if (dev) {
135
-		mask = dev->coherent_dma_mask;
136
-
137
-		/*
138
-		 * Sanity check the DMA mask - it must be non-zero, and
139
-		 * must be able to be satisfied by a DMA allocation.
140
-		 */
141
-		if (mask == 0) {
142
-			dev_warn(dev, "coherent DMA mask is unset\n");
143
-			goto no_page;
144
-		}
145
-
146
-	}
147
-
148
-	/*
149
-	 * Sanity check the allocation size.
150
-	 */
151
-	size = PAGE_ALIGN(size);
152
-	limit = (mask + 1) & ~mask;
153
-	if ((limit && size >= limit) ||
154
-	    size >= (CONSISTENT_END - CONSISTENT_BASE)) {
155
-		pr_warn("coherent allocation too big "
156
-			"(requested %#x mask %#llx)\n", size, mask);
157
-		goto no_page;
158
-	}
159
-
160
-	order = get_order(size);
161
-
162
-	if (mask != 0xffffffff)
163
-		gfp |= GFP_DMA;
164
-
165
-	page = alloc_pages(gfp, order);
166
-	if (!page)
167
-		goto no_page;
168
-
169
-	/*
170
-	 * Invalidate any data that might be lurking in the
171
-	 * kernel direct-mapped region for device DMA.
172
-	 */
173
-	{
174
-		unsigned long kaddr = (unsigned long)page_address(page);
175
-		memset(page_address(page), 0, size);
176
-		cpu_dma_wbinval_range(kaddr, kaddr + size);
177
-	}
178
-
179
-	/*
180
-	 * Allocate a virtual address in the consistent mapping region.
181
-	 */
182
-	c = vm_region_alloc(&consistent_head, size,
183
-			    gfp & ~(__GFP_DMA | __GFP_HIGHMEM));
184
-	if (c) {
185
-		pte_t *pte = consistent_pte + CONSISTENT_OFFSET(c->vm_start);
186
-		struct page *end = page + (1 << order);
187
-
188
-		c->vm_pages = page;
189
-
190
-		/*
191
-		 * Set the "dma handle"
192
-		 */
193
-		*handle = page_to_phys(page);
194
-
195
-		do {
196
-			BUG_ON(!pte_none(*pte));
197
-
198
-			/*
199
-			 * x86 does not mark the pages reserved...
200
-			 */
201
-			SetPageReserved(page);
202
-			set_pte(pte, mk_pte(page, prot));
203
-			page++;
204
-			pte++;
205
-		} while (size -= PAGE_SIZE);
206
-
207
-		/*
208
-		 * Free the otherwise unused pages.
209
-		 */
210
-		while (page < end) {
211
-			__free_page(page);
212
-			page++;
213
-		}
214
-
215
-		return (void *)c->vm_start;
216
-	}
217
-
218
-	if (page)
219
-		__free_pages(page, order);
220
-no_page:
221
-	*handle = ~0;
222
-	return NULL;
223
-}
224
-
225
-void arch_dma_free(struct device *dev, size_t size, void *cpu_addr,
226
-		dma_addr_t handle, unsigned long attrs)
227
-{
228
-	struct arch_vm_region *c;
229
-	unsigned long flags, addr;
230
-	pte_t *ptep;
231
-
232
-	size = PAGE_ALIGN(size);
233
-
234
-	raw_spin_lock_irqsave(&consistent_lock, flags);
235
-
236
-	c = vm_region_find(&consistent_head, (unsigned long)cpu_addr);
237
-	if (!c)
238
-		goto no_area;
239
-
240
-	if ((c->vm_end - c->vm_start) != size) {
241
-		pr_err("%s: freeing wrong coherent size (%ld != %d)\n",
242
-		       __func__, c->vm_end - c->vm_start, size);
243
-		dump_stack();
244
-		size = c->vm_end - c->vm_start;
245
-	}
246
-
247
-	ptep = consistent_pte + CONSISTENT_OFFSET(c->vm_start);
248
-	addr = c->vm_start;
249
-	do {
250
-		pte_t pte = ptep_get_and_clear(&init_mm, addr, ptep);
251
-		unsigned long pfn;
252
-
253
-		ptep++;
254
-		addr += PAGE_SIZE;
255
-
256
-		if (!pte_none(pte) && pte_present(pte)) {
257
-			pfn = pte_pfn(pte);
258
-
259
-			if (pfn_valid(pfn)) {
260
-				struct page *page = pfn_to_page(pfn);
261
-
262
-				/*
263
-				 * x86 does not mark the pages reserved...
264
-				 */
265
-				ClearPageReserved(page);
266
-
267
-				__free_page(page);
268
-				continue;
269
-			}
270
-		}
271
-
272
-		pr_crit("%s: bad page in kernel page table\n", __func__);
273
-	} while (size -= PAGE_SIZE);
274
-
275
-	flush_tlb_kernel_range(c->vm_start, c->vm_end);
276
-
277
-	list_del(&c->vm_list);
278
-
279
-	raw_spin_unlock_irqrestore(&consistent_lock, flags);
280
-
281
-	kfree(c);
282
-	return;
283
-
284
-no_area:
285
-	raw_spin_unlock_irqrestore(&consistent_lock, flags);
286
-	pr_err("%s: trying to free invalid coherent area: %p\n",
287
-	       __func__, cpu_addr);
288
-	dump_stack();
289
-}
290
-
291
-/*
292
- * Initialise the consistent memory allocation.
293
- */
294
-static int __init consistent_init(void)
295
-{
296
-	pgd_t *pgd;
297
-	pmd_t *pmd;
298
-	pte_t *pte;
299
-	int ret = 0;
300
-
301
-	do {
302
-		pgd = pgd_offset(&init_mm, CONSISTENT_BASE);
303
-		pmd = pmd_alloc(&init_mm, pgd, CONSISTENT_BASE);
304
-		if (!pmd) {
305
-			pr_err("%s: no pmd tables\n", __func__);
306
-			ret = -ENOMEM;
307
-			break;
308
-		}
309
-		/* The first level mapping may be created in somewhere.
310
-		 * It's not necessary to warn here. */
311
-		/* WARN_ON(!pmd_none(*pmd)); */
312
-
313
-		pte = pte_alloc_kernel(pmd, CONSISTENT_BASE);
314
-		if (!pte) {
315
-			ret = -ENOMEM;
316
-			break;
317
-		}
318
-
319
-		consistent_pte = pte;
320
-	} while (0);
321
-
322
-	return ret;
323
-}
324
-
325
-core_initcall(consistent_init);
32612 
32713 static inline void cache_op(phys_addr_t paddr, size_t size,
32814 		void (*fn)(unsigned long start, unsigned long end))
....@@ -360,8 +46,8 @@
36046 	} while (left);
36147 }
36248 
363
-void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr,
364
-		size_t size, enum dma_data_direction dir)
49
+void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
50
+		enum dma_data_direction dir)
36551 {
36652 	switch (dir) {
36753 	case DMA_FROM_DEVICE:
....@@ -375,8 +61,8 @@
37561 	}
37662 }
37763 
378
-void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr,
379
-		size_t size, enum dma_data_direction dir)
64
+void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
65
+		enum dma_data_direction dir)
38066 {
38167 	switch (dir) {
38268 	case DMA_TO_DEVICE:
....@@ -389,3 +75,8 @@
38975 		BUG();
39076 	}
39177 }
78
+
79
+void arch_dma_prep_coherent(struct page *page, size_t size)
80
+{
81
+	cache_op(page_to_phys(page), size, cpu_dma_wbinval_range);
82
+}