Differential D22559 Diff 64970 head/sys/x86/iommu/busdma_dmar.c

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head/sys/x86/iommu/busdma_dmar.c

Show First 20 Lines • Show All 967 Lines • ▼ Show 20 Lines	dmar_fini_busdma(struct dmar_unit *unit)

if (unit->delayed_taskqueue == NULL)		if (unit->delayed_taskqueue == NULL)
return;		return;

taskqueue_drain(unit->delayed_taskqueue, &unit->dmamap_load_task);		taskqueue_drain(unit->delayed_taskqueue, &unit->dmamap_load_task);
taskqueue_free(unit->delayed_taskqueue);		taskqueue_free(unit->delayed_taskqueue);
unit->delayed_taskqueue = NULL;		unit->delayed_taskqueue = NULL;
}		}

		int
		bus_dma_dmar_load_ident(bus_dma_tag_t dmat, bus_dmamap_t map1,
		vm_paddr_t start, vm_size_t length, int flags)
		{
		struct bus_dma_tag_common *tc;
		struct bus_dma_tag_dmar *tag;
		struct bus_dmamap_dmar *map;
		struct dmar_ctx *ctx;
		struct dmar_domain *domain;
		struct dmar_map_entry *entry;
		vm_page_t *ma;
		vm_size_t i;
		int error;
		bool waitok;

		MPASS((start & PAGE_MASK) == 0);
		MPASS((length & PAGE_MASK) == 0);
		MPASS(length > 0);
		MPASS(start + length >= start);
		MPASS((flags & ~(BUS_DMA_NOWAIT \| BUS_DMA_NOWRITE)) == 0);

		tc = (struct bus_dma_tag_common *)dmat;
		if (tc->impl != &bus_dma_dmar_impl)
		return (0);

		tag = (struct bus_dma_tag_dmar *)dmat;
		ctx = tag->ctx;
		domain = ctx->domain;
		map = (struct bus_dmamap_dmar *)map1;
		waitok = (flags & BUS_DMA_NOWAIT) != 0;

		entry = dmar_gas_alloc_entry(domain, waitok ? 0 : DMAR_PGF_WAITOK);
		if (entry == NULL)
		return (ENOMEM);
		entry->start = start;
		entry->end = start + length;
		ma = malloc(sizeof(vm_page_t) * atop(length), M_TEMP, waitok ?
		M_WAITOK : M_NOWAIT);
		if (ma == NULL) {
		dmar_gas_free_entry(domain, entry);
		return (ENOMEM);
		}
		for (i = 0; i < atop(length); i++) {
		ma[i] = vm_page_getfake(entry->start + PAGE_SIZE * i,
		VM_MEMATTR_DEFAULT);
		}
		error = dmar_gas_map_region(domain, entry, DMAR_MAP_ENTRY_READ \|
		((flags & BUS_DMA_NOWRITE) ? 0 : DMAR_MAP_ENTRY_WRITE),
		waitok ? DMAR_GM_CANWAIT : 0, ma);
		if (error == 0) {
		DMAR_DOMAIN_LOCK(domain);
		TAILQ_INSERT_TAIL(&map->map_entries, entry, dmamap_link);
		entry->flags \|= DMAR_MAP_ENTRY_MAP;
		DMAR_DOMAIN_UNLOCK(domain);
		} else {
		dmar_domain_unload_entry(entry, true);
		}
		for (i = 0; i < atop(length); i++)
		vm_page_putfake(ma[i]);
		free(ma, M_TEMP);
		return (error);
		}