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>

diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
index 72521749c01d9eb886658a5df3855b5419815258..4390f6d7050fcc140fdf2dc6a0e4bbb173f8cc54 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
@@ -3005,6 +3005,7 @@ void dcn10_prepare_bandwidth(
 {
        struct dce_hwseq *hws = dc->hwseq;
        struct hubbub *hubbub = dc->res_pool->hubbub;
+       int min_fclk_khz, min_dcfclk_khz, socclk_khz;
 
        if (dc->debug.sanity_checks)
                hws->funcs.verify_allow_pstate_change_high(dc);
@@ -3027,8 +3028,11 @@ void dcn10_prepare_bandwidth(
 
        if (dc->debug.pplib_wm_report_mode == WM_REPORT_OVERRIDE) {
                DC_FP_START();
-               dcn_bw_notify_pplib_of_wm_ranges(dc);
+               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);
        }
 
        if (dc->debug.sanity_checks)
@@ -3041,6 +3045,7 @@ void dcn10_optimize_bandwidth(
 {
        struct dce_hwseq *hws = dc->hwseq;
        struct hubbub *hubbub = dc->res_pool->hubbub;
+       int min_fclk_khz, min_dcfclk_khz, socclk_khz;
 
        if (dc->debug.sanity_checks)
                hws->funcs.verify_allow_pstate_change_high(dc);
@@ -3064,8 +3069,11 @@ void dcn10_optimize_bandwidth(
 
        if (dc->debug.pplib_wm_report_mode == WM_REPORT_OVERRIDE) {
                DC_FP_START();
-               dcn_bw_notify_pplib_of_wm_ranges(dc);
+               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);
        }
 
        if (dc->debug.sanity_checks)

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 831080b9eb873aac719beaff5dfc2930469c99ab..56d30baf12df29fc741e318ced1551ce452dcc15 100644 (file)
--- 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;

diff --git a/drivers/gpu/drm/amd/display/dc/dml/calcs/dcn_calcs.c b/drivers/gpu/drm/amd/display/dc/dml/calcs/dcn_calcs.c
index d46adc849d2aab799a9b1cd9f9446f31b1f3372a..e73f089c84bb6c7e519333bfa2e99170a090b6d0 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dml/calcs/dcn_calcs.c
+++ b/drivers/gpu/drm/amd/display/dc/dml/calcs/dcn_calcs.c
@@ -1444,81 +1444,67 @@ unsigned int dcn_find_dcfclk_suits_all(
        return dcf_clk;
 }
 
-static bool verify_clock_values(struct dm_pp_clock_levels_with_voltage *clks)
+void dcn_bw_update_from_pplib_fclks(
+       struct dc *dc,
+       struct dm_pp_clock_levels_with_voltage *fclks)
 {
-       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;
+       unsigned vmin0p65_idx, vmid0p72_idx, vnom0p8_idx, vmax0p9_idx;
 
-       return true;
+       ASSERT(fclks->num_levels);
+
+       vmin0p65_idx = 0;
+       vmid0p72_idx = fclks->num_levels -
+               (fclks->num_levels > 2 ? 3 : (fclks->num_levels > 1 ? 2 : 1));
+       vnom0p8_idx = fclks->num_levels - (fclks->num_levels > 1 ? 2 : 1);
+       vmax0p9_idx = fclks->num_levels - 1;
+
+       dc->dcn_soc->fabric_and_dram_bandwidth_vmin0p65 =
+               32 * (fclks->data[vmin0p65_idx].clocks_in_khz / 1000.0) / 1000.0;
+       dc->dcn_soc->fabric_and_dram_bandwidth_vmid0p72 =
+               dc->dcn_soc->number_of_channels *
+               (fclks->data[vmid0p72_idx].clocks_in_khz / 1000.0)
+               * ddr4_dram_factor_single_Channel / 1000.0;
+       dc->dcn_soc->fabric_and_dram_bandwidth_vnom0p8 =
+               dc->dcn_soc->number_of_channels *
+               (fclks->data[vnom0p8_idx].clocks_in_khz / 1000.0)
+               * ddr4_dram_factor_single_Channel / 1000.0;
+       dc->dcn_soc->fabric_and_dram_bandwidth_vmax0p9 =
+               dc->dcn_soc->number_of_channels *
+               (fclks->data[vmax0p9_idx].clocks_in_khz / 1000.0)
+               * ddr4_dram_factor_single_Channel / 1000.0;
 }
 
-void dcn_bw_update_from_pplib(struct dc *dc)
+void dcn_bw_update_from_pplib_dcfclks(
+       struct dc *dc,
+       struct dm_pp_clock_levels_with_voltage *dcfclks)
 {
-       struct dc_context *ctx = dc->ctx;
-       struct dm_pp_clock_levels_with_voltage fclks = {0}, dcfclks = {0};
-       bool res;
-       unsigned vmin0p65_idx, vmid0p72_idx, vnom0p8_idx, vmax0p9_idx;
-
-       /* 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);
-
-       if (res)
-               res = verify_clock_values(&fclks);
-
-       if (res) {
-               ASSERT(fclks.num_levels);
-
-               vmin0p65_idx = 0;
-               vmid0p72_idx = fclks.num_levels -
-                       (fclks.num_levels > 2 ? 3 : (fclks.num_levels > 1 ? 2 : 1));
-               vnom0p8_idx = fclks.num_levels - (fclks.num_levels > 1 ? 2 : 1);
-               vmax0p9_idx = fclks.num_levels - 1;
-
-               dc->dcn_soc->fabric_and_dram_bandwidth_vmin0p65 =
-                       32 * (fclks.data[vmin0p65_idx].clocks_in_khz / 1000.0) / 1000.0;
-               dc->dcn_soc->fabric_and_dram_bandwidth_vmid0p72 =
-                       dc->dcn_soc->number_of_channels *
-                       (fclks.data[vmid0p72_idx].clocks_in_khz / 1000.0)
-                       * ddr4_dram_factor_single_Channel / 1000.0;
-               dc->dcn_soc->fabric_and_dram_bandwidth_vnom0p8 =
-                       dc->dcn_soc->number_of_channels *
-                       (fclks.data[vnom0p8_idx].clocks_in_khz / 1000.0)
-                       * ddr4_dram_factor_single_Channel / 1000.0;
-               dc->dcn_soc->fabric_and_dram_bandwidth_vmax0p9 =
-                       dc->dcn_soc->number_of_channels *
-                       (fclks.data[vmax0p9_idx].clocks_in_khz / 1000.0)
-                       * ddr4_dram_factor_single_Channel / 1000.0;
-       } else
-               BREAK_TO_DEBUGGER();
-
-       res = dm_pp_get_clock_levels_by_type_with_voltage(
-                       ctx, DM_PP_CLOCK_TYPE_DCFCLK, &dcfclks);
-
-       if (res)
-               res = verify_clock_values(&dcfclks);
+       if (dcfclks->num_levels >= 3) {
+               dc->dcn_soc->dcfclkv_min0p65 = dcfclks->data[0].clocks_in_khz / 1000.0;
+               dc->dcn_soc->dcfclkv_mid0p72 = dcfclks->data[dcfclks->num_levels - 3].clocks_in_khz / 1000.0;
+               dc->dcn_soc->dcfclkv_nom0p8 = dcfclks->data[dcfclks->num_levels - 2].clocks_in_khz / 1000.0;
+               dc->dcn_soc->dcfclkv_max0p9 = dcfclks->data[dcfclks->num_levels - 1].clocks_in_khz / 1000.0;
+       }
+}
 
-       if (res && dcfclks.num_levels >= 3) {
-               dc->dcn_soc->dcfclkv_min0p65 = dcfclks.data[0].clocks_in_khz / 1000.0;
-               dc->dcn_soc->dcfclkv_mid0p72 = dcfclks.data[dcfclks.num_levels - 3].clocks_in_khz / 1000.0;
-               dc->dcn_soc->dcfclkv_nom0p8 = dcfclks.data[dcfclks.num_levels - 2].clocks_in_khz / 1000.0;
-               dc->dcn_soc->dcfclkv_max0p9 = dcfclks.data[dcfclks.num_levels - 1].clocks_in_khz / 1000.0;
-       } else
-               BREAK_TO_DEBUGGER();
+void dcn_get_soc_clks(
+       struct dc *dc,
+       int *min_fclk_khz,
+       int *min_dcfclk_khz,
+       int *socclk_khz)
+{
+       *min_fclk_khz = dc->dcn_soc->fabric_and_dram_bandwidth_vmin0p65 * 1000000 / 32;
+       *min_dcfclk_khz = dc->dcn_soc->dcfclkv_min0p65 * 1000;
+       *socclk_khz = dc->dcn_soc->socclk * 1000;
 }
 
-void dcn_bw_notify_pplib_of_wm_ranges(struct dc *dc)
+void dcn_bw_notify_pplib_of_wm_ranges(
+       struct dc *dc,
+       int min_fclk_khz,
+       int min_dcfclk_khz,
+       int socclk_khz)
 {
        struct pp_smu_funcs_rv *pp = NULL;
        struct pp_smu_wm_range_sets ranges = {0};
-       int min_fclk_khz, min_dcfclk_khz, socclk_khz;
        const int overdrive = 5000000; /* 5 GHz to cover Overdrive */
 
        if (dc->res_pool->pp_smu)
@@ -1526,10 +1512,6 @@ void dcn_bw_notify_pplib_of_wm_ranges(struct dc *dc)
        if (!pp || !pp->set_wm_ranges)
                return;
 
-       min_fclk_khz = dc->dcn_soc->fabric_and_dram_bandwidth_vmin0p65 * 1000000 / 32;
-       min_dcfclk_khz = dc->dcn_soc->dcfclkv_min0p65 * 1000;
-       socclk_khz = dc->dcn_soc->socclk * 1000;
-
        /* Now notify PPLib/SMU about which Watermarks sets they should select
         * depending on DPM state they are in. And update BW MGR GFX Engine and
         * Memory clock member variables for Watermarks calculations for each

diff --git a/drivers/gpu/drm/amd/display/dc/inc/dcn_calcs.h b/drivers/gpu/drm/amd/display/dc/inc/dcn_calcs.h
index 806f3041db1419ca505c5b842768f22f1da289c3..9e4ddc985240655fe574522387a39efe4a88c6cc 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/inc/dcn_calcs.h
+++ b/drivers/gpu/drm/amd/display/dc/inc/dcn_calcs.h
@@ -628,8 +628,23 @@ unsigned int dcn_find_dcfclk_suits_all(
        const struct dc *dc,
        struct dc_clocks *clocks);
 
-void dcn_bw_update_from_pplib(struct dc *dc);
-void dcn_bw_notify_pplib_of_wm_ranges(struct dc *dc);
+void dcn_get_soc_clks(
+               struct dc *dc,
+               int *min_fclk_khz,
+               int *min_dcfclk_khz,
+               int *socclk_khz);
+
+void dcn_bw_update_from_pplib_fclks(
+               struct dc *dc,
+               struct dm_pp_clock_levels_with_voltage *fclks);
+void dcn_bw_update_from_pplib_dcfclks(
+               struct dc *dc,
+               struct dm_pp_clock_levels_with_voltage *dcfclks);
+void dcn_bw_notify_pplib_of_wm_ranges(
+               struct dc *dc,
+               int min_fclk_khz,
+               int min_dcfclk_khz,
+               int socclk_khz);
 void dcn_bw_sync_calcs_and_dml(struct dc *dc);
 
 enum source_macro_tile_size swizzle_mode_to_macro_tile_size(enum swizzle_mode_values sw_mode);