On Mon, May 31, 2021 at 09:38:12AM +0200, Ahmad Fatoum wrote: > The RISC-V architecture allows overriding the dma_alloc_coherent and > dma_free_coherent. Allow this to be controlled by device tree. > > Cache-coherent SoCs won't need this, but incoherent ones that have > uncached regions can register them here. > > Signed-off-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx> > --- > +static void *pool_alloc_coherent(size_t size, dma_addr_t *dma_handle) > +{ > + struct dma_coherent_pool *pool; > + void *ret = NULL; > + > + list_for_each_entry(pool, &pools, list) { > + ret = tlsf_memalign(pool->handle, DMA_ALIGNMENT, size); > + if (!ret) > + continue; > + } > + > + BUG_ON(!ret); Being out of memory is no bug, no? > + > + memset(ret, 0, size); > + > + if (dma_handle) > + *dma_handle = (dma_addr_t)ret; > + > + pr_debug("alloc(%zu) == %p\n", size, ret); > + > + return ret; > +} > + > +static void pool_free_coherent(void *vaddr, dma_addr_t dma_handle, size_t size) > +{ > + resource_size_t addr = (resource_size_t)vaddr; > + struct dma_coherent_pool *pool; > + > + list_for_each_entry(pool, &pools, list) { > + if (pool->resource->start <= addr && addr <= pool->resource->end) { Nice :) I would have written if (addr >= start && addr <= end), but the way you have written it makes it visually clear from the first sight that addr should be in that specific range. > + tlsf_free(pool->handle, vaddr); > + return; > + } > + } > + > + pr_warn("freeing invalid region: %p\n", vaddr); > +} > + > +static const struct dma_coherent_ops pool_ops = { > + .alloc = pool_alloc_coherent, > + .free = pool_free_coherent, > +}; > + > +static int compare_pool_sizes(struct list_head *_a, struct list_head *_b) > +{ > + struct dma_coherent_pool *a = list_entry(_a, struct dma_coherent_pool, list); > + struct dma_coherent_pool *b = list_entry(_b, struct dma_coherent_pool, list); > + > + if (resource_size(a->resource) > resource_size(b->resource)) > + return 1; > + if (resource_size(a->resource) < resource_size(b->resource)) > + return -1; > + return 0; > +} > + > +static int dma_declare_coherent_pool(const struct resource *res) > +{ > + struct dma_coherent_pool *pool; > + tlsf_t handle; > + > + handle = tlsf_create_with_pool((void *)res->start, resource_size(res)); > + if (!handle) > + return -EINVAL; > + > + pool = xmalloc(sizeof(*pool)); Better xzalloc()? It's too easy to add some element to a structure and assume that it's initialized. > + pool->handle = handle; > + pool->resource = res; > + > + list_add_sort(&pool->list, &pools, compare_pool_sizes); The pools are sorted by their size, but is this a good criterion for the pools priority? Sascha -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox