1 // SPDX-License-Identifier: GPL-2.0
3  * DMA memory management for framework level HCD code (hc_driver)
17 #include <linux/dma-mapping.h>
25  * DMA-Coherent Buffers
28 /* FIXME tune these based on pool statistics ... */
44 		pool_max[0] = 0;	/* Don't use this pool */  in usb_init_pool_max()
52  * hcd_buffer_create - initialize buffer pools
57  * Call this as part of initializing a host controller that uses the dma
58  * memory allocators.  It initializes some pools of dma-coherent memory that
70 	if (hcd->localmem_pool || !hcd_uses_dma(hcd))  in hcd_buffer_create()
77 		snprintf(name, sizeof(name), "buffer-%d", size);  in hcd_buffer_create()
78 		hcd->pool[i] = dma_pool_create(name, hcd->self.sysdev,  in hcd_buffer_create()
80 		if (!hcd->pool[i]) {  in hcd_buffer_create()
82 			return -ENOMEM;  in hcd_buffer_create()
90  * hcd_buffer_destroy - deallocate buffer pools
105 		dma_pool_destroy(hcd->pool[i]);  in hcd_buffer_destroy()
106 		hcd->pool[i] = NULL;  in hcd_buffer_destroy()
119 	dma_addr_t		*dma  in hcd_buffer_alloc()  argument
128 	if (hcd->localmem_pool)  in hcd_buffer_alloc()
129 		return gen_pool_dma_alloc(hcd->localmem_pool, size, dma);  in hcd_buffer_alloc()
133 		*dma = ~(dma_addr_t) 0;  in hcd_buffer_alloc()
139 			return dma_pool_alloc(hcd->pool[i], mem_flags, dma);  in hcd_buffer_alloc()
141 	return dma_alloc_coherent(hcd->self.sysdev, size, dma, mem_flags);  in hcd_buffer_alloc()
148 	dma_addr_t		dma  in hcd_buffer_free()  argument
157 	if (hcd->localmem_pool) {  in hcd_buffer_free()
158 		gen_pool_free(hcd->localmem_pool, (unsigned long)addr, size);  in hcd_buffer_free()
169 			dma_pool_free(hcd->pool[i], addr, dma);  in hcd_buffer_free()
173 	dma_free_coherent(hcd->self.sysdev, size, addr, dma);  in hcd_buffer_free()
177 		size_t size, gfp_t mem_flags, dma_addr_t *dma)  in hcd_buffer_alloc_pages()  argument
182 	if (hcd->localmem_pool)  in hcd_buffer_alloc_pages()
183 		return gen_pool_dma_alloc_align(hcd->localmem_pool,  in hcd_buffer_alloc_pages()
184 				size, dma, PAGE_SIZE);  in hcd_buffer_alloc_pages()
188 		*dma = DMA_MAPPING_ERROR;  in hcd_buffer_alloc_pages()
193 	return dma_alloc_coherent(hcd->self.sysdev,  in hcd_buffer_alloc_pages()
194 			size, dma, mem_flags);  in hcd_buffer_alloc_pages()
198 		size_t size, void *addr, dma_addr_t dma)  in hcd_buffer_free_pages()  argument
203 	if (hcd->localmem_pool) {  in hcd_buffer_free_pages()
204 		gen_pool_free(hcd->localmem_pool,  in hcd_buffer_free_pages()
214 	dma_free_coherent(hcd->self.sysdev, size, addr, dma);  in hcd_buffer_free_pages()