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thunderbolt: Add KUnit test for devices with no DisplayPort adapters

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Add a KUnit test to check that buffer allocation works also for devices
with no DP adapters.

Signed-off-by: Gil Fine <gil.fine@intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
This commit is contained in:
Gil Fine 2022-05-09 23:49:04 +03:00 committed by Mika Westerberg
parent 93bf344f66
commit c7c99a09ef
1 changed files with 92 additions and 0 deletions
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92
drivers/thunderbolt/test.c
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@ -341,6 +341,47 @@ static struct tb_switch *alloc_dev_with_dpin(struct kunit *test,
return sw;
}
static struct tb_switch *alloc_dev_without_dp(struct kunit *test,
struct tb_switch *parent,
u64 route, bool bonded)
{
struct tb_switch *sw;
int i;
sw = alloc_dev_default(test, parent, route, bonded);
if (!sw)
return NULL;
/*
* Device with:
* 2x USB4 Adapters (adapters 1,2 and 3,4),
* 1x PCIe Upstream (adapter 9),
* 1x PCIe Downstream (adapter 10),
* 1x USB3 Upstream (adapter 16),
* 1x USB3 Downstream (adapter 17)
*/
for (i = 5; i <= 8; i++)
sw->ports[i].disabled = true;
for (i = 11; i <= 14; i++)
sw->ports[i].disabled = true;
sw->ports[13].cap_adap = 0;
sw->ports[14].cap_adap = 0;
for (i = 18; i <= 19; i++)
sw->ports[i].disabled = true;
sw->generation = 4;
sw->credit_allocation = true;
sw->max_usb3_credits = 109;
sw->min_dp_aux_credits = 0;
sw->min_dp_main_credits = 0;
sw->max_pcie_credits = 30;
sw->max_dma_credits = 1;
return sw;
}
static struct tb_switch *alloc_dev_usb4(struct kunit *test,
struct tb_switch *parent,
u64 route, bool bonded)
@ -1996,6 +2037,56 @@ static void tb_test_credit_alloc_pcie(struct kunit *test)
tb_tunnel_free(tunnel);
}
static void tb_test_credit_alloc_without_dp(struct kunit *test)
{
struct tb_switch *host, *dev;
struct tb_port *up, *down;
struct tb_tunnel *tunnel;
struct tb_path *path;
host = alloc_host_usb4(test);
dev = alloc_dev_without_dp(test, host, 0x1, true);
/*
* The device has no DP therefore baMinDPmain = baMinDPaux = 0
*
* Create PCIe path with buffers less than baMaxPCIe.
*
* For a device with buffers configurations:
* baMaxUSB3 = 109
* baMinDPaux = 0
* baMinDPmain = 0
* baMaxPCIe = 30
* baMaxHI = 1
* Remaining Buffers = Total - (CP + DP) = 120 - (2 + 0) = 118
* PCIe Credits = Max(6, Min(baMaxPCIe, Remaining Buffers - baMaxUSB3)
* = Max(6, Min(30, 9) = 9
*/
down = &host->ports[8];
up = &dev->ports[9];
tunnel = tb_tunnel_alloc_pci(NULL, up, down);
KUNIT_ASSERT_TRUE(test, tunnel != NULL);
KUNIT_ASSERT_EQ(test, tunnel->npaths, (size_t)2);
/* PCIe downstream path */
path = tunnel->paths[0];
KUNIT_ASSERT_EQ(test, path->path_length, 2);
KUNIT_EXPECT_EQ(test, path->hops[0].nfc_credits, 0U);
KUNIT_EXPECT_EQ(test, path->hops[0].initial_credits, 7U);
KUNIT_EXPECT_EQ(test, path->hops[1].nfc_credits, 0U);
KUNIT_EXPECT_EQ(test, path->hops[1].initial_credits, 9U);
/* PCIe upstream path */
path = tunnel->paths[1];
KUNIT_ASSERT_EQ(test, path->path_length, 2);
KUNIT_EXPECT_EQ(test, path->hops[0].nfc_credits, 0U);
KUNIT_EXPECT_EQ(test, path->hops[0].initial_credits, 7U);
KUNIT_EXPECT_EQ(test, path->hops[1].nfc_credits, 0U);
KUNIT_EXPECT_EQ(test, path->hops[1].initial_credits, 64U);
tb_tunnel_free(tunnel);
}
static void tb_test_credit_alloc_dp(struct kunit *test)
{
struct tb_switch *host, *dev;
@ -2709,6 +2800,7 @@ static struct kunit_case tb_test_cases[] = {
KUNIT_CASE(tb_test_credit_alloc_legacy_not_bonded),
KUNIT_CASE(tb_test_credit_alloc_legacy_bonded),
KUNIT_CASE(tb_test_credit_alloc_pcie),
KUNIT_CASE(tb_test_credit_alloc_without_dp),
KUNIT_CASE(tb_test_credit_alloc_dp),
KUNIT_CASE(tb_test_credit_alloc_usb3),
KUNIT_CASE(tb_test_credit_alloc_dma),