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thunderbolt: Make it possible to allocate one directional DMA tunnel
With DMA tunnels it is possible that the service using it does not require bi-directional paths so make RX and TX optional (but of course one of them needs to be set). Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Acked-by: Yehezkel Bernat <YehezkelShB@gmail.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -34,9 +34,6 @@
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#define TB_DP_AUX_PATH_OUT 1
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#define TB_DP_AUX_PATH_IN 2
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#define TB_DMA_PATH_OUT 0
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#define TB_DMA_PATH_IN 1
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static const char * const tb_tunnel_names[] = { "PCI", "DP", "DMA", "USB3" };
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#define __TB_TUNNEL_PRINT(level, tunnel, fmt, arg...) \
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@ -829,10 +826,10 @@ static void tb_dma_init_path(struct tb_path *path, unsigned int isb,
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* @nhi: Host controller port
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* @dst: Destination null port which the other domain is connected to
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* @transmit_ring: NHI ring number used to send packets towards the
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* other domain
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* other domain. Set to %0 if TX path is not needed.
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* @transmit_path: HopID used for transmitting packets
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* @receive_ring: NHI ring number used to receive packets from the
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* other domain
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* other domain. Set to %0 if RX path is not needed.
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* @reveive_path: HopID used for receiving packets
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*
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* Return: Returns a tb_tunnel on success or NULL on failure.
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@ -843,10 +840,19 @@ struct tb_tunnel *tb_tunnel_alloc_dma(struct tb *tb, struct tb_port *nhi,
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int receive_path)
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{
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struct tb_tunnel *tunnel;
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size_t npaths = 0, i = 0;
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struct tb_path *path;
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u32 credits;
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tunnel = tb_tunnel_alloc(tb, 2, TB_TUNNEL_DMA);
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if (receive_ring)
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npaths++;
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if (transmit_ring)
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npaths++;
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if (WARN_ON(!npaths))
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return NULL;
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tunnel = tb_tunnel_alloc(tb, npaths, TB_TUNNEL_DMA);
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if (!tunnel)
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return NULL;
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@ -856,22 +862,28 @@ struct tb_tunnel *tb_tunnel_alloc_dma(struct tb *tb, struct tb_port *nhi,
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credits = tb_dma_credits(nhi);
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path = tb_path_alloc(tb, dst, receive_path, nhi, receive_ring, 0, "DMA RX");
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if (!path) {
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tb_tunnel_free(tunnel);
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return NULL;
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if (receive_ring) {
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path = tb_path_alloc(tb, dst, receive_path, nhi, receive_ring, 0,
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"DMA RX");
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if (!path) {
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tb_tunnel_free(tunnel);
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return NULL;
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}
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tb_dma_init_path(path, TB_PATH_NONE, TB_PATH_SOURCE | TB_PATH_INTERNAL,
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credits);
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tunnel->paths[i++] = path;
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}
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tb_dma_init_path(path, TB_PATH_NONE, TB_PATH_SOURCE | TB_PATH_INTERNAL,
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credits);
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tunnel->paths[TB_DMA_PATH_IN] = path;
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path = tb_path_alloc(tb, nhi, transmit_ring, dst, transmit_path, 0, "DMA TX");
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if (!path) {
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tb_tunnel_free(tunnel);
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return NULL;
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if (transmit_ring) {
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path = tb_path_alloc(tb, nhi, transmit_ring, dst, transmit_path, 0,
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"DMA TX");
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if (!path) {
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tb_tunnel_free(tunnel);
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return NULL;
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}
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tb_dma_init_path(path, TB_PATH_SOURCE, TB_PATH_ALL, credits);
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tunnel->paths[i++] = path;
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}
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tb_dma_init_path(path, TB_PATH_SOURCE, TB_PATH_ALL, credits);
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tunnel->paths[TB_DMA_PATH_OUT] = path;
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return tunnel;
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}
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