drm/amd/display: Fix mutex lock in dcn10

Removal of DC_FP_* wrappers from dml (9696679bf7ac) provokes a mutex
lock [2] on the amdgpu driver. Re-arrange the dcn10 code to avoid
locking the mutex by placing the DC_FP_* wrappers around the proper
functions.

This fixes the following WARN/stacktrace:

BUG: sleeping function called from invalid context at kernel/locking/mutex.c:283
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 227, name: systemd-udevd
preempt_count: 1, expected: 0
CPU: 4 PID: 227 Comm: systemd-udevd Not tainted 6.0.0-rc6-qtec-standard #2
Hardware name: Qtechnology A/S QT5222/QT5221, BIOS v1.0.1 06/07/2021
Call Trace:
 <TASK>
 dump_stack_lvl+0x33/0x42
 __might_resched.cold.172+0xa5/0xb3
 mutex_lock+0x1a/0x40
 amdgpu_dpm_get_clock_by_type_with_voltage+0x38/0x70 [amdgpu]
 dm_pp_get_clock_levels_by_type_with_voltage+0x64/0xa0 [amdgpu]
 dcn_bw_update_from_pplib+0x70/0x340 [amdgpu]
 dcn10_create_resource_pool+0x8c8/0xd20 [amdgpu]
 ? __kmalloc+0x1c7/0x4a0
 dc_create_resource_pool+0xe7/0x190 [amdgpu]
 dc_create+0x212/0x5d0 [amdgpu]
 amdgpu_dm_init+0x246/0x370 [amdgpu]
 ? schedule_hrtimeout_range_clock+0x93/0x120
 ? phm_wait_for_register_unequal.part.1+0x4a/0x80 [amdgpu]
 dm_hw_init+0xe/0x20 [amdgpu]
 amdgpu_device_init.cold.56+0x1324/0x1653 [amdgpu]
 ? pci_bus_read_config_word+0x43/0x80
 amdgpu_driver_load_kms+0x15/0x120 [amdgpu]
 amdgpu_pci_probe+0x116/0x320 [amdgpu]
 pci_device_probe+0x97/0x110
 really_probe+0xdd/0x340
 __driver_probe_device+0x80/0x170
 driver_probe_device+0x1f/0x90
 __driver_attach+0xdc/0x180
 ? __device_attach_driver+0x100/0x100
 ? __device_attach_driver+0x100/0x100
 bus_for_each_dev+0x74/0xc0
 bus_add_driver+0x19e/0x210
 ? kset_find_obj+0x30/0xa0
 ? 0xffffffffa0a5b000
 driver_register+0x6b/0xc0
 ? 0xffffffffa0a5b000
 do_one_initcall+0x4a/0x1f0
 ? __vunmap+0x28e/0x2f0
 ? __cond_resched+0x15/0x30
 ? kmem_cache_alloc_trace+0x3d/0x440
 do_init_module+0x4a/0x1e0
 load_module+0x1cba/0x1e10
 ? __do_sys_finit_module+0xb7/0x120
 __do_sys_finit_module+0xb7/0x120
 do_syscall_64+0x3c/0x80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7ff2b5f5422d
Code: 5d c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48
89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48>
3d 01 f0 ff ff 73 01 c3 48 8b 0d c3 ab 0e 00 f7 d8 64 89 01 48
RSP: 002b:00007ffc44ab28e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
RAX: ffffffffffffffda RBX: 0000555c566a9240 RCX: 00007ff2b5f5422d
RDX: 0000000000000000 RSI: 00007ff2b60bb353 RDI: 0000000000000019
RBP: 00007ff2b60bb353 R08: 0000000000000000 R09: 0000555c566a9240
R10: 0000000000000019 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000020000 R14: 0000000000000000 R15: 0000000000000000
</TASK>

Fixes: 9696679bf7ac ("drm/amd/display: remove DC_FP_* wrapper from dml folder")
Reviewed-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Daniel Gomez <daniel@qtec.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 61 insertions, 5 deletions

diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c
index 831080b9eb87..56d30baf12df 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c
@@ -1336,6 +1336,21 @@ static noinline void dcn10_resource_construct_fp(
 	}
 }
 
+static bool verify_clock_values(struct dm_pp_clock_levels_with_voltage *clks)
+{
+	int i;
+
+	if (clks->num_levels == 0)
+		return false;
+
+	for (i = 0; i < clks->num_levels; i++)
+		/* Ensure that the result is sane */
+		if (clks->data[i].clocks_in_khz == 0)
+			return false;
+
+	return true;
+}
+
 static bool dcn10_resource_construct(
 	uint8_t num_virtual_links,
 	struct dc *dc,
@@ -1345,6 +1360,9 @@ static bool dcn10_resource_construct(
 	int j;
 	struct dc_context *ctx = dc->ctx;
 	uint32_t pipe_fuses = read_pipe_fuses(ctx);
+	struct dm_pp_clock_levels_with_voltage fclks = {0}, dcfclks = {0};
+	int min_fclk_khz, min_dcfclk_khz, socclk_khz;
+	bool res;
 
 	ctx->dc_bios->regs = &bios_regs;
 
@@ -1523,15 +1541,53 @@ static bool dcn10_resource_construct(
 			&& pool->base.pp_smu->rv_funcs.set_pme_wa_enable != NULL)
 		dc->debug.az_endpoint_mute_only = false;
 
-	DC_FP_START();
-	if (!dc->debug.disable_pplib_clock_request)
-		dcn_bw_update_from_pplib(dc);
+
+	if (!dc->debug.disable_pplib_clock_request) {
+		/*
+		 * TODO: This is not the proper way to obtain
+		 * fabric_and_dram_bandwidth, should be min(fclk, memclk).
+		 */
+		res = dm_pp_get_clock_levels_by_type_with_voltage(
+				ctx, DM_PP_CLOCK_TYPE_FCLK, &fclks);
+
+		DC_FP_START();
+
+		if (res)
+			res = verify_clock_values(&fclks);
+
+		if (res)
+			dcn_bw_update_from_pplib_fclks(dc, &fclks);
+		else
+			BREAK_TO_DEBUGGER();
+
+		DC_FP_END();
+
+		res = dm_pp_get_clock_levels_by_type_with_voltage(
+			ctx, DM_PP_CLOCK_TYPE_DCFCLK, &dcfclks);
+
+		DC_FP_START();
+
+		if (res)
+			res = verify_clock_values(&dcfclks);
+
+		if (res)
+			dcn_bw_update_from_pplib_dcfclks(dc, &dcfclks);
+		else
+			BREAK_TO_DEBUGGER();
+
+		DC_FP_END();
+	}
+
 	dcn_bw_sync_calcs_and_dml(dc);
 	if (!dc->debug.disable_pplib_wm_range) {
 		dc->res_pool = &pool->base;
-		dcn_bw_notify_pplib_of_wm_ranges(dc);
+		DC_FP_START();
+		dcn_get_soc_clks(
+			dc, &min_fclk_khz, &min_dcfclk_khz, &socclk_khz);
+		DC_FP_END();
+		dcn_bw_notify_pplib_of_wm_ranges(
+			dc, min_fclk_khz, min_dcfclk_khz, socclk_khz);
 	}
-	DC_FP_END();
 
 	{
 		struct irq_service_init_data init_data;