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thunderbolt: Allow specifying custom credits for DMA tunnels

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The default ones should be find but this allows the user to tweak the
credits to get more performance out of the P2P connection.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
This commit is contained in:
Mika Westerberg 2022-09-08 13:17:26 +03:00
parent ccdb0900a0
commit 7ee20d0afb
1 changed files with 9 additions and 4 deletions
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13
drivers/thunderbolt/tunnel.c
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@ -41,9 +41,14 @@
* Number of credits we try to allocate for each DMA path if not limited
* by the host router baMaxHI.
*/
#define TB_DMA_CREDITS 14U
#define TB_DMA_CREDITS 14
/* Minimum number of credits for DMA path */
#define TB_MIN_DMA_CREDITS 1U
#define TB_MIN_DMA_CREDITS 1
static unsigned int dma_credits = TB_DMA_CREDITS;
module_param(dma_credits, uint, 0444);
MODULE_PARM_DESC(dma_credits, "specify custom credits for DMA tunnels (default: "
__MODULE_STRING(TB_DMA_CREDITS) ")");
static bool bw_alloc_mode = true;
module_param(bw_alloc_mode, bool, 0444);
@ -95,7 +100,7 @@ static unsigned int tb_available_credits(const struct tb_port *port,
pcie = tb_acpi_may_tunnel_pcie() ? sw->max_pcie_credits : 0;
if (tb_acpi_is_xdomain_allowed()) {
spare = min_not_zero(sw->max_dma_credits, TB_DMA_CREDITS);
spare = min_not_zero(sw->max_dma_credits, dma_credits);
/* Add some credits for potential second DMA tunnel */
spare += TB_MIN_DMA_CREDITS;
} else {
@ -1472,7 +1477,7 @@ struct tb_tunnel *tb_tunnel_alloc_dma(struct tb *tb, struct tb_port *nhi,
tunnel->dst_port = dst;
tunnel->deinit = tb_dma_deinit;
credits = min_not_zero(TB_DMA_CREDITS, nhi->sw->max_dma_credits);
credits = min_not_zero(dma_credits, nhi->sw->max_dma_credits);
if (receive_ring > 0) {
path = tb_path_alloc(tb, dst, receive_path, nhi, receive_ring, 0,