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2024-01-04 1543e317f1da31b75942316931e8f491a8920811 
 kernel/drivers/gpu/arm/bifrost/mali_kbase_mem_linux.h
....@@ -1,7 +1,7 @@
11 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
22 /*
33  *
4
- * (C) COPYRIGHT 2010, 2012-2021 ARM Limited. All rights reserved.
4
+ * (C) COPYRIGHT 2010, 2012-2022 ARM Limited. All rights reserved.
55  *
66  * This program is free software and is provided to you under the terms of the
77  * GNU General Public License version 2 as published by the Free Software
....@@ -20,7 +20,7 @@
2020  */
2121 
2222 /**
23
- * Base kernel memory APIs, Linux implementation.
23
+ * DOC: Base kernel memory APIs, Linux implementation.
2424  */
2525 
2626 #ifndef _KBASE_MEM_LINUX_H_
....@@ -44,13 +44,15 @@
4444  * @flags:        bitmask of BASE_MEM_* flags to convey special requirements &
4545  *                properties for the new allocation.
4646  * @gpu_va:       Start address of the memory region which was allocated from GPU
47
- *                virtual address space.
47
+ *                virtual address space. If the BASE_MEM_FLAG_MAP_FIXED is set
48
+ *                then this parameter shall be provided by the caller.
49
+ * @mmu_sync_info: Indicates whether this call is synchronous wrt MMU ops.
4850  *
4951  * Return: 0 on success or error code
5052  */
51
-struct kbase_va_region *kbase_mem_alloc(struct kbase_context *kctx,
52
-					u64 va_pages, u64 commit_pages,
53
-					u64 extension, u64 *flags, u64 *gpu_va);
53
+struct kbase_va_region *kbase_mem_alloc(struct kbase_context *kctx, u64 va_pages, u64 commit_pages,
54
+					u64 extension, u64 *flags, u64 *gpu_va,
55
+					enum kbase_caller_mmu_sync_info mmu_sync_info);
5456 
5557 /**
5658  * kbase_mem_query - Query properties of a GPU memory region
....@@ -169,6 +171,7 @@
169171  * @reg:       The GPU region
170172  * @new_pages: The number of pages after the grow
171173  * @old_pages: The number of pages before the grow
174
+ * @mmu_sync_info: Indicates whether this call is synchronous wrt MMU ops.
172175  *
173176  * Return: 0 on success, -errno on error.
174177  *
....@@ -178,8 +181,9 @@
178181  * Note: Caller must be holding the region lock.
179182  */
180183 int kbase_mem_grow_gpu_mapping(struct kbase_context *kctx,
181
-		struct kbase_va_region *reg,
182
-		u64 new_pages, u64 old_pages);
184
+			       struct kbase_va_region *reg, u64 new_pages,
185
+			       u64 old_pages,
186
+			       enum kbase_caller_mmu_sync_info mmu_sync_info);
183187 
184188 /**
185189  * kbase_mem_evictable_make - Make a physical allocation eligible for eviction
....@@ -213,6 +217,26 @@
213217  */
214218 bool kbase_mem_evictable_unmake(struct kbase_mem_phy_alloc *alloc);
215219 
220
+typedef unsigned int kbase_vmap_flag;
221
+
222
+/* Sync operations are needed on beginning and ending of access to kernel-mapped GPU memory.
223
+ *
224
+ * This is internal to the struct kbase_vmap_struct and should not be passed in by callers of
225
+ * kbase_vmap-related functions.
226
+ */
227
+#define KBASE_VMAP_FLAG_SYNC_NEEDED (((kbase_vmap_flag)1) << 0)
228
+
229
+/* Permanently mapped memory accounting (including enforcing limits) should be done on the
230
+ * kernel-mapped GPU memory.
231
+ *
232
+ * This should be used if the kernel mapping is going to live for a potentially long time, for
233
+ * example if it will persist after the caller has returned.
234
+ */
235
+#define KBASE_VMAP_FLAG_PERMANENT_MAP_ACCOUNTING (((kbase_vmap_flag)1) << 1)
236
+
237
+/* Set of flags that can be passed into kbase_vmap-related functions */
238
+#define KBASE_VMAP_INPUT_FLAGS (KBASE_VMAP_FLAG_PERMANENT_MAP_ACCOUNTING)
239
+
216240 struct kbase_vmap_struct {
217241 	off_t offset_in_page;
218242 	struct kbase_mem_phy_alloc *cpu_alloc;
....@@ -221,9 +245,55 @@
221245 	struct tagged_addr *gpu_pages;
222246 	void *addr;
223247 	size_t size;
224
-	bool sync_needed;
248
+	kbase_vmap_flag flags;
225249 };
226250 
251
+/**
252
+ * kbase_mem_shrink_gpu_mapping - Shrink the GPU mapping of an allocation
253
+ * @kctx:      Context the region belongs to
254
+ * @reg:       The GPU region or NULL if there isn't one
255
+ * @new_pages: The number of pages after the shrink
256
+ * @old_pages: The number of pages before the shrink
257
+ *
258
+ * Return: 0 on success, negative -errno on error
259
+ *
260
+ * Unmap the shrunk pages from the GPU mapping. Note that the size of the region
261
+ * itself is unmodified as we still need to reserve the VA, only the page tables
262
+ * will be modified by this function.
263
+ */
264
+int kbase_mem_shrink_gpu_mapping(struct kbase_context *kctx, struct kbase_va_region *reg,
265
+				 u64 new_pages, u64 old_pages);
266
+
267
+/**
268
+ * kbase_vmap_reg - Map part of an existing region into the kernel safely, only if the requested
269
+ *                  access permissions are supported
270
+ * @kctx:         Context @reg belongs to
271
+ * @reg:          The GPU region to map part of
272
+ * @gpu_addr:     Start address of VA range to map, which must be within @reg
273
+ * @size:         Size of VA range, which when added to @gpu_addr must be within @reg
274
+ * @prot_request: Flags indicating how the caller will then access the memory
275
+ * @map:          Structure to be given to kbase_vunmap() on freeing
276
+ * @vmap_flags:   Flags of type kbase_vmap_flag
277
+ *
278
+ * Return: Kernel-accessible CPU pointer to the VA range, or NULL on error
279
+ *
280
+ * Variant of kbase_vmap_prot() that can be used given an existing region.
281
+ *
282
+ * The caller must satisfy one of the following for @reg:
283
+ * * It must have been obtained by finding it on the region tracker, and the region lock must not
284
+ *   have been released in the mean time.
285
+ * * Or, it must have been refcounted with a call to kbase_va_region_alloc_get(), and the region
286
+ *   lock is now held again.
287
+ * * Or, @reg has had NO_USER_FREE set at creation time or under the region lock, and the
288
+ *   region lock is now held again.
289
+ *
290
+ * The acceptable @vmap_flags are those in %KBASE_VMAP_INPUT_FLAGS.
291
+ *
292
+ * Refer to kbase_vmap_prot() for more information on the operation of this function.
293
+ */
294
+void *kbase_vmap_reg(struct kbase_context *kctx, struct kbase_va_region *reg, u64 gpu_addr,
295
+		     size_t size, unsigned long prot_request, struct kbase_vmap_struct *map,
296
+		     kbase_vmap_flag vmap_flags);
227297 
228298 /**
229299  * kbase_vmap_prot - Map a GPU VA range into the kernel safely, only if the
....@@ -254,7 +324,7 @@
254324  * The checks are also there to help catch access errors on memory where
255325  * security is not a concern: imported memory that is always RW, and memory
256326  * that was allocated and owned by the process attached to @kctx. In this case,
257
- * it helps to identify memory that was was mapped with the wrong access type.
327
+ * it helps to identify memory that was mapped with the wrong access type.
258328  *
259329  * Note: KBASE_REG_GPU_{RD,WR} flags are currently supported for legacy cases
260330  * where either the security of memory is solely dependent on those flags, or
....@@ -422,12 +492,12 @@
422492 /**
423493  * kbase_get_cache_line_alignment - Return cache line alignment
424494  *
495
+ * @kbdev: Device pointer.
496
+ *
425497  * Helper function to return the maximum cache line alignment considering
426498  * both CPU and GPU cache sizes.
427499  *
428500  * Return: CPU and GPU cache line alignment, in bytes.
429
- *
430
- * @kbdev: Device pointer.
431501  */
432502 u32 kbase_get_cache_line_alignment(struct kbase_device *kbdev);
433503 
....@@ -435,18 +505,7 @@
435505 static inline vm_fault_t vmf_insert_pfn_prot(struct vm_area_struct *vma,
436506 			unsigned long addr, unsigned long pfn, pgprot_t pgprot)
437507 {
438
-	int err;
439
-
440
-#if ((KERNEL_VERSION(4, 4, 147) >= LINUX_VERSION_CODE) || \
441
-		((KERNEL_VERSION(4, 6, 0) > LINUX_VERSION_CODE) && \
442
-		 (KERNEL_VERSION(4, 5, 0) <= LINUX_VERSION_CODE)))
443
-	if (pgprot_val(pgprot) != pgprot_val(vma->vm_page_prot))
444
-		return VM_FAULT_SIGBUS;
445
-
446
-	err = vm_insert_pfn(vma, addr, pfn);
447
-#else
448
-	err = vm_insert_pfn_prot(vma, addr, pfn, pgprot);
449
-#endif
508
+	int err = vm_insert_pfn_prot(vma, addr, pfn, pgprot);
450509 
451510 	if (unlikely(err == -ENOMEM))
452511 		return VM_FAULT_OOM;