SCSI: Respect DMA_HIGH_ADDRESS, if specified.

Related to #19191 and others.

src/add-ons/kernel/bus_managers/scsi/busses.cpp

@@ -217,6 +217,9 @@ scsi_init_bus(device_node *node, void **cookie)
 	if (pnp->get_attr_uint32(node, B_DMA_MAX_SEGMENT_COUNT,
 			&bus->dma_params.max_sg_blocks, true) != B_OK)
 		bus->dma_params.max_sg_blocks = ~0;
+	if (pnp->get_attr_uint64(node, B_DMA_HIGH_ADDRESS,
+			&bus->dma_params.high_address, true) != B_OK)
+		bus->dma_params.high_address = ~0;
 
 	// do some sanity check:
 	bus->dma_params.max_sg_block_size &= ~bus->dma_params.alignment;

src/add-ons/kernel/bus_managers/scsi/dma_buffer.cpp

@@ -39,10 +39,10 @@ is_sg_list_dma_safe(scsi_ccb *request)
 	scsi_bus_info *bus = request->bus;
 	const physical_entry *sg_list = request->sg_list;
 	uint32 sg_count = request->sg_count;
-	uint32 dma_boundary = bus->dma_params.dma_boundary;
+	const uint32 dma_boundary = bus->dma_params.dma_boundary;
-	uint32 alignment = bus->dma_params.alignment;
+	const uint32 alignment = bus->dma_params.alignment;
-	uint32 max_sg_block_size = bus->dma_params.max_sg_block_size;
+	const uint32 max_sg_block_size = bus->dma_params.max_sg_block_size;
-	uint32 cur_idx;
+	const uint64 high_address = bus->dma_params.high_address;
 
 	// not too many S/G list entries
 	if (sg_count > bus->dma_params.max_sg_blocks) {
@@ -54,8 +54,8 @@ is_sg_list_dma_safe(scsi_ccb *request)
 	if (dma_boundary == ~(uint32)0 && alignment == 0 && max_sg_block_size == 0)
 		return true;
 
-	// argh - controller is a bit picky, so make sure he likes us
+	// argh - controller is a bit picky, so make sure it likes us
-	for (cur_idx = sg_count; cur_idx >= 1; --cur_idx, ++sg_list) {
+	for (uint32 cur_idx = sg_count; cur_idx >= 1; --cur_idx, ++sg_list) {
 		phys_addr_t max_len;
 
 		// calculate space upto next dma boundary crossing and
@@ -81,6 +81,12 @@ is_sg_list_dma_safe(scsi_ccb *request)
 			return false;
 		}
 
+		if ((sg_list->address + sg_list->size) > high_address) {
+			SHOW_FLOW(0, "S/G-entry above high address @%" B_PRIxPHYSADDR,
+				sg_list->address + sg_list->size);
+			return false;
+		}
+
 		// verify entry size
 		if (sg_list->size > max_sg_block_size) {
 			SHOW_FLOW(0, "S/G-entry is too long (%" B_PRIuPHYSADDR "/%" B_PRIu32

src/add-ons/kernel/bus_managers/scsi/scsi_internal.h

@@ -79,6 +79,7 @@ typedef struct dma_params {
 	uint32 dma_boundary;
 	uint32 max_sg_block_size;
 	uint32 max_sg_blocks;
+	uint64 high_address;
 } dma_params;