[PATCH] drm/radeon/ni_dpm: Fix booting bug

From: Gustavo A. R. Silva
Date: Sun May 09 2021 - 18:48:59 EST

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Create new structure NISLANDS_SMC_SWSTATE_SINGLE, as initialState.levels
and ACPIState.levels are never actually used as flexible arrays. Those
arrays can be used as simple objects of type
NISLANDS_SMC_HW_PERFORMANCE_LEVEL, instead.

Currently, the code fails because flexible array _levels_ in
struct NISLANDS_SMC_SWSTATE doesn't allow for code that access
the first element of initialState.levels and ACPIState.levels
arrays:

drivers/gpu/drm/radeon/ni_dpm.c:
1690 table->initialState.levels[0].mclk.vMPLL_AD_FUNC_CNTL =
1691 cpu_to_be32(ni_pi->clock_registers.mpll_ad_func_cntl);
...
1903: table->ACPIState.levels[0].mclk.vMPLL_AD_FUNC_CNTL = cpu_to_be32(mpll_ad_func_cntl);
1904: table->ACPIState.levels[0].mclk.vMPLL_AD_FUNC_CNTL_2 = cpu_to_be32(mpll_ad_func_cntl_2);

because such element cannot exist without previously allocating
any dynamic memory for it (which never actually happens).

That's why struct NISLANDS_SMC_SWSTATE should only be used as type
for object driverState and new struct SISLANDS_SMC_SWSTATE_SINGLE is
created as type for objects initialState, ACPIState and ULVState.

Also, with the change from one-element array to flexible-array member
in commit 434fb1e7444a ("drm/radeon/nislands_smc.h: Replace one-element
array with flexible-array member in struct NISLANDS_SMC_SWSTATE"), the
size of dpmLevels in struct NISLANDS_SMC_STATETABLE should be fixed to
be NISLANDS_MAX_SMC_PERFORMANCE_LEVELS_PER_SWSTATE instead of
NISLANDS_MAX_SMC_PERFORMANCE_LEVELS_PER_SWSTATE - 1.

Bug: https://lore.kernel.org/dri-devel/3eedbe78-1fbd-4763-a7f3-ac5665e76a4a@xxxxxxxxxxx/
Fixes: 434fb1e7444a ("drm/radeon/nislands_smc.h: Replace one-element array with flexible-array member in struct NISLANDS_SMC_SWSTATE")
Cc: stable@xxxxxxxxxxxxxxx
Reported-by: Christian Zigotzky <chzigotzky@xxxxxxxxxxx>
Tested-by: Christian Zigotzky <chzigotzky@xxxxxxxxxxx>
Link: https://lore.kernel.org/dri-devel/9bb5fcbd-daf5-1669-b3e7-b8624b3c36f9@xxxxxxxxxxx/
Signed-off-by: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx>
---
drivers/gpu/drm/radeon/ni_dpm.c | 144 +++++++++++++-------------
drivers/gpu/drm/radeon/nislands_smc.h | 34 +++---
2 files changed, 94 insertions(+), 84 deletions(-)

diff --git a/drivers/gpu/drm/radeon/ni_dpm.c b/drivers/gpu/drm/radeon/ni_dpm.c
index dd5ef6493723..769f666335ac 100644
--- a/drivers/gpu/drm/radeon/ni_dpm.c
+++ b/drivers/gpu/drm/radeon/ni_dpm.c
@@ -1687,102 +1687,102 @@ static int ni_populate_smc_initial_state(struct radeon_device *rdev,
u32 reg;
int ret;

- table->initialState.levels[0].mclk.vMPLL_AD_FUNC_CNTL =
+ table->initialState.level.mclk.vMPLL_AD_FUNC_CNTL =
cpu_to_be32(ni_pi->clock_registers.mpll_ad_func_cntl);
- table->initialState.levels[0].mclk.vMPLL_AD_FUNC_CNTL_2 =
+ table->initialState.level.mclk.vMPLL_AD_FUNC_CNTL_2 =
cpu_to_be32(ni_pi->clock_registers.mpll_ad_func_cntl_2);
- table->initialState.levels[0].mclk.vMPLL_DQ_FUNC_CNTL =
+ table->initialState.level.mclk.vMPLL_DQ_FUNC_CNTL =
cpu_to_be32(ni_pi->clock_registers.mpll_dq_func_cntl);
- table->initialState.levels[0].mclk.vMPLL_DQ_FUNC_CNTL_2 =
+ table->initialState.level.mclk.vMPLL_DQ_FUNC_CNTL_2 =
cpu_to_be32(ni_pi->clock_registers.mpll_dq_func_cntl_2);
- table->initialState.levels[0].mclk.vMCLK_PWRMGT_CNTL =
+ table->initialState.level.mclk.vMCLK_PWRMGT_CNTL =
cpu_to_be32(ni_pi->clock_registers.mclk_pwrmgt_cntl);
- table->initialState.levels[0].mclk.vDLL_CNTL =
+ table->initialState.level.mclk.vDLL_CNTL =
cpu_to_be32(ni_pi->clock_registers.dll_cntl);
- table->initialState.levels[0].mclk.vMPLL_SS =
+ table->initialState.level.mclk.vMPLL_SS =
cpu_to_be32(ni_pi->clock_registers.mpll_ss1);
- table->initialState.levels[0].mclk.vMPLL_SS2 =
+ table->initialState.level.mclk.vMPLL_SS2 =
cpu_to_be32(ni_pi->clock_registers.mpll_ss2);
- table->initialState.levels[0].mclk.mclk_value =
+ table->initialState.level.mclk.mclk_value =
cpu_to_be32(initial_state->performance_levels[0].mclk);

- table->initialState.levels[0].sclk.vCG_SPLL_FUNC_CNTL =
+ table->initialState.level.sclk.vCG_SPLL_FUNC_CNTL =
cpu_to_be32(ni_pi->clock_registers.cg_spll_func_cntl);
- table->initialState.levels[0].sclk.vCG_SPLL_FUNC_CNTL_2 =
+ table->initialState.level.sclk.vCG_SPLL_FUNC_CNTL_2 =
cpu_to_be32(ni_pi->clock_registers.cg_spll_func_cntl_2);
- table->initialState.levels[0].sclk.vCG_SPLL_FUNC_CNTL_3 =
+ table->initialState.level.sclk.vCG_SPLL_FUNC_CNTL_3 =
cpu_to_be32(ni_pi->clock_registers.cg_spll_func_cntl_3);
- table->initialState.levels[0].sclk.vCG_SPLL_FUNC_CNTL_4 =
+ table->initialState.level.sclk.vCG_SPLL_FUNC_CNTL_4 =
cpu_to_be32(ni_pi->clock_registers.cg_spll_func_cntl_4);
- table->initialState.levels[0].sclk.vCG_SPLL_SPREAD_SPECTRUM =
+ table->initialState.level.sclk.vCG_SPLL_SPREAD_SPECTRUM =
cpu_to_be32(ni_pi->clock_registers.cg_spll_spread_spectrum);
- table->initialState.levels[0].sclk.vCG_SPLL_SPREAD_SPECTRUM_2 =
+ table->initialState.level.sclk.vCG_SPLL_SPREAD_SPECTRUM_2 =
cpu_to_be32(ni_pi->clock_registers.cg_spll_spread_spectrum_2);
- table->initialState.levels[0].sclk.sclk_value =
+ table->initialState.level.sclk.sclk_value =
cpu_to_be32(initial_state->performance_levels[0].sclk);
- table->initialState.levels[0].arbRefreshState =
+ table->initialState.level.arbRefreshState =
NISLANDS_INITIAL_STATE_ARB_INDEX;

- table->initialState.levels[0].ACIndex = 0;
+ table->initialState.level.ACIndex = 0;

ret = ni_populate_voltage_value(rdev, &eg_pi->vddc_voltage_table,
initial_state->performance_levels[0].vddc,
- &table->initialState.levels[0].vddc);
+ &table->initialState.level.vddc);
if (!ret) {
u16 std_vddc;

ret = ni_get_std_voltage_value(rdev,
- &table->initialState.levels[0].vddc,
+ &table->initialState.level.vddc,
&std_vddc);
if (!ret)
ni_populate_std_voltage_value(rdev, std_vddc,
- table->initialState.levels[0].vddc.index,
- &table->initialState.levels[0].std_vddc);
+ table->initialState.level.vddc.index,
+ &table->initialState.level.std_vddc);
}

if (eg_pi->vddci_control)
ni_populate_voltage_value(rdev,
&eg_pi->vddci_voltage_table,
initial_state->performance_levels[0].vddci,
- &table->initialState.levels[0].vddci);
+ &table->initialState.level.vddci);

- ni_populate_initial_mvdd_value(rdev, &table->initialState.levels[0].mvdd);
+ ni_populate_initial_mvdd_value(rdev, &table->initialState.level.mvdd);

reg = CG_R(0xffff) | CG_L(0);
- table->initialState.levels[0].aT = cpu_to_be32(reg);
+ table->initialState.level.aT = cpu_to_be32(reg);

- table->initialState.levels[0].bSP = cpu_to_be32(pi->dsp);
+ table->initialState.level.bSP = cpu_to_be32(pi->dsp);

if (pi->boot_in_gen2)
- table->initialState.levels[0].gen2PCIE = 1;
+ table->initialState.level.gen2PCIE = 1;
else
- table->initialState.levels[0].gen2PCIE = 0;
+ table->initialState.level.gen2PCIE = 0;

if (pi->mem_gddr5) {
- table->initialState.levels[0].strobeMode =
+ table->initialState.level.strobeMode =
cypress_get_strobe_mode_settings(rdev,
initial_state->performance_levels[0].mclk);

if (initial_state->performance_levels[0].mclk > pi->mclk_edc_enable_threshold)
- table->initialState.levels[0].mcFlags = NISLANDS_SMC_MC_EDC_RD_FLAG | NISLANDS_SMC_MC_EDC_WR_FLAG;
+ table->initialState.level.mcFlags = NISLANDS_SMC_MC_EDC_RD_FLAG | NISLANDS_SMC_MC_EDC_WR_FLAG;
else
- table->initialState.levels[0].mcFlags = 0;
+ table->initialState.level.mcFlags = 0;
}

table->initialState.levelCount = 1;

table->initialState.flags |= PPSMC_SWSTATE_FLAG_DC;

- table->initialState.levels[0].dpm2.MaxPS = 0;
- table->initialState.levels[0].dpm2.NearTDPDec = 0;
- table->initialState.levels[0].dpm2.AboveSafeInc = 0;
- table->initialState.levels[0].dpm2.BelowSafeInc = 0;
+ table->initialState.level.dpm2.MaxPS = 0;
+ table->initialState.level.dpm2.NearTDPDec = 0;
+ table->initialState.level.dpm2.AboveSafeInc = 0;
+ table->initialState.level.dpm2.BelowSafeInc = 0;

reg = MIN_POWER_MASK | MAX_POWER_MASK;
- table->initialState.levels[0].SQPowerThrottle = cpu_to_be32(reg);
+ table->initialState.level.SQPowerThrottle = cpu_to_be32(reg);

reg = MAX_POWER_DELTA_MASK | STI_SIZE_MASK | LTI_RATIO_MASK;
- table->initialState.levels[0].SQPowerThrottle_2 = cpu_to_be32(reg);
+ table->initialState.level.SQPowerThrottle_2 = cpu_to_be32(reg);

return 0;
}
@@ -1813,43 +1813,43 @@ static int ni_populate_smc_acpi_state(struct radeon_device *rdev,
if (pi->acpi_vddc) {
ret = ni_populate_voltage_value(rdev,
&eg_pi->vddc_voltage_table,
- pi->acpi_vddc, &table->ACPIState.levels[0].vddc);
+ pi->acpi_vddc, &table->ACPIState.level.vddc);
if (!ret) {
u16 std_vddc;

ret = ni_get_std_voltage_value(rdev,
- &table->ACPIState.levels[0].vddc, &std_vddc);
+ &table->ACPIState.level.vddc, &std_vddc);
if (!ret)
ni_populate_std_voltage_value(rdev, std_vddc,
- table->ACPIState.levels[0].vddc.index,
- &table->ACPIState.levels[0].std_vddc);
+ table->ACPIState.level.vddc.index,
+ &table->ACPIState.level.std_vddc);
}

if (pi->pcie_gen2) {
if (pi->acpi_pcie_gen2)
- table->ACPIState.levels[0].gen2PCIE = 1;
+ table->ACPIState.level.gen2PCIE = 1;
else
- table->ACPIState.levels[0].gen2PCIE = 0;
+ table->ACPIState.level.gen2PCIE = 0;
} else {
- table->ACPIState.levels[0].gen2PCIE = 0;
+ table->ACPIState.level.gen2PCIE = 0;
}
} else {
ret = ni_populate_voltage_value(rdev,
&eg_pi->vddc_voltage_table,
pi->min_vddc_in_table,
- &table->ACPIState.levels[0].vddc);
+ &table->ACPIState.level.vddc);
if (!ret) {
u16 std_vddc;

ret = ni_get_std_voltage_value(rdev,
- &table->ACPIState.levels[0].vddc,
+ &table->ACPIState.level.vddc,
&std_vddc);
if (!ret)
ni_populate_std_voltage_value(rdev, std_vddc,
- table->ACPIState.levels[0].vddc.index,
- &table->ACPIState.levels[0].std_vddc);
+ table->ACPIState.level.vddc.index,
+ &table->ACPIState.level.std_vddc);
}
- table->ACPIState.levels[0].gen2PCIE = 0;
+ table->ACPIState.level.gen2PCIE = 0;
}

if (eg_pi->acpi_vddci) {
@@ -1857,7 +1857,7 @@ static int ni_populate_smc_acpi_state(struct radeon_device *rdev,
ni_populate_voltage_value(rdev,
&eg_pi->vddci_voltage_table,
eg_pi->acpi_vddci,
- &table->ACPIState.levels[0].vddci);
+ &table->ACPIState.level.vddci);
}

@@ -1900,37 +1900,37 @@ static int ni_populate_smc_acpi_state(struct radeon_device *rdev,
spll_func_cntl_2 &= ~SCLK_MUX_SEL_MASK;
spll_func_cntl_2 |= SCLK_MUX_SEL(4);

- table->ACPIState.levels[0].mclk.vMPLL_AD_FUNC_CNTL = cpu_to_be32(mpll_ad_func_cntl);
- table->ACPIState.levels[0].mclk.vMPLL_AD_FUNC_CNTL_2 = cpu_to_be32(mpll_ad_func_cntl_2);
- table->ACPIState.levels[0].mclk.vMPLL_DQ_FUNC_CNTL = cpu_to_be32(mpll_dq_func_cntl);
- table->ACPIState.levels[0].mclk.vMPLL_DQ_FUNC_CNTL_2 = cpu_to_be32(mpll_dq_func_cntl_2);
- table->ACPIState.levels[0].mclk.vMCLK_PWRMGT_CNTL = cpu_to_be32(mclk_pwrmgt_cntl);
- table->ACPIState.levels[0].mclk.vDLL_CNTL = cpu_to_be32(dll_cntl);
+ table->ACPIState.level.mclk.vMPLL_AD_FUNC_CNTL = cpu_to_be32(mpll_ad_func_cntl);
+ table->ACPIState.level.mclk.vMPLL_AD_FUNC_CNTL_2 = cpu_to_be32(mpll_ad_func_cntl_2);
+ table->ACPIState.level.mclk.vMPLL_DQ_FUNC_CNTL = cpu_to_be32(mpll_dq_func_cntl);
+ table->ACPIState.level.mclk.vMPLL_DQ_FUNC_CNTL_2 = cpu_to_be32(mpll_dq_func_cntl_2);
+ table->ACPIState.level.mclk.vMCLK_PWRMGT_CNTL = cpu_to_be32(mclk_pwrmgt_cntl);
+ table->ACPIState.level.mclk.vDLL_CNTL = cpu_to_be32(dll_cntl);

- table->ACPIState.levels[0].mclk.mclk_value = 0;
+ table->ACPIState.level.mclk.mclk_value = 0;

- table->ACPIState.levels[0].sclk.vCG_SPLL_FUNC_CNTL = cpu_to_be32(spll_func_cntl);
- table->ACPIState.levels[0].sclk.vCG_SPLL_FUNC_CNTL_2 = cpu_to_be32(spll_func_cntl_2);
- table->ACPIState.levels[0].sclk.vCG_SPLL_FUNC_CNTL_3 = cpu_to_be32(spll_func_cntl_3);
- table->ACPIState.levels[0].sclk.vCG_SPLL_FUNC_CNTL_4 = cpu_to_be32(spll_func_cntl_4);
+ table->ACPIState.level.sclk.vCG_SPLL_FUNC_CNTL = cpu_to_be32(spll_func_cntl);
+ table->ACPIState.level.sclk.vCG_SPLL_FUNC_CNTL_2 = cpu_to_be32(spll_func_cntl_2);
+ table->ACPIState.level.sclk.vCG_SPLL_FUNC_CNTL_3 = cpu_to_be32(spll_func_cntl_3);
+ table->ACPIState.level.sclk.vCG_SPLL_FUNC_CNTL_4 = cpu_to_be32(spll_func_cntl_4);

- table->ACPIState.levels[0].sclk.sclk_value = 0;
+ table->ACPIState.level.sclk.sclk_value = 0;

- ni_populate_mvdd_value(rdev, 0, &table->ACPIState.levels[0].mvdd);
+ ni_populate_mvdd_value(rdev, 0, &table->ACPIState.level.mvdd);

if (eg_pi->dynamic_ac_timing)
- table->ACPIState.levels[0].ACIndex = 1;
+ table->ACPIState.level.ACIndex = 1;

- table->ACPIState.levels[0].dpm2.MaxPS = 0;
- table->ACPIState.levels[0].dpm2.NearTDPDec = 0;
- table->ACPIState.levels[0].dpm2.AboveSafeInc = 0;
- table->ACPIState.levels[0].dpm2.BelowSafeInc = 0;
+ table->ACPIState.level.dpm2.MaxPS = 0;
+ table->ACPIState.level.dpm2.NearTDPDec = 0;
+ table->ACPIState.level.dpm2.AboveSafeInc = 0;
+ table->ACPIState.level.dpm2.BelowSafeInc = 0;

reg = MIN_POWER_MASK | MAX_POWER_MASK;
- table->ACPIState.levels[0].SQPowerThrottle = cpu_to_be32(reg);
+ table->ACPIState.level.SQPowerThrottle = cpu_to_be32(reg);

reg = MAX_POWER_DELTA_MASK | STI_SIZE_MASK | LTI_RATIO_MASK;
- table->ACPIState.levels[0].SQPowerThrottle_2 = cpu_to_be32(reg);
+ table->ACPIState.level.SQPowerThrottle_2 = cpu_to_be32(reg);

return 0;
}
@@ -1980,7 +1980,9 @@ static int ni_init_smc_table(struct radeon_device *rdev)
if (ret)
return ret;

- table->driverState = table->initialState;
+ table->driverState.flags = table->initialState.flags;
+ table->driverState.levelCount = table->initialState.levelCount;
+ table->driverState.levels[0] = table->initialState.level;

table->ULVState = table->initialState;

diff --git a/drivers/gpu/drm/radeon/nislands_smc.h b/drivers/gpu/drm/radeon/nislands_smc.h
index 7395cb6b3cac..42f3bab0f9ee 100644
--- a/drivers/gpu/drm/radeon/nislands_smc.h
+++ b/drivers/gpu/drm/radeon/nislands_smc.h
@@ -143,6 +143,14 @@ struct NISLANDS_SMC_SWSTATE

typedef struct NISLANDS_SMC_SWSTATE NISLANDS_SMC_SWSTATE;

+struct NISLANDS_SMC_SWSTATE_SINGLE {
+ uint8_t flags;
+ uint8_t levelCount;
+ uint8_t padding2;
+ uint8_t padding3;
+ NISLANDS_SMC_HW_PERFORMANCE_LEVEL level;
+};
+
#define NISLANDS_SMC_VOLTAGEMASK_VDDC 0
#define NISLANDS_SMC_VOLTAGEMASK_MVDD 1
#define NISLANDS_SMC_VOLTAGEMASK_VDDCI 2
@@ -160,19 +168,19 @@ typedef struct NISLANDS_SMC_VOLTAGEMASKTABLE NISLANDS_SMC_VOLTAGEMASKTABLE;

struct NISLANDS_SMC_STATETABLE
{
- uint8_t thermalProtectType;
- uint8_t systemFlags;
- uint8_t maxVDDCIndexInPPTable;
- uint8_t extraFlags;
- uint8_t highSMIO[NISLANDS_MAX_NO_VREG_STEPS];
- uint32_t lowSMIO[NISLANDS_MAX_NO_VREG_STEPS];
- NISLANDS_SMC_VOLTAGEMASKTABLE voltageMaskTable;
- PP_NIslands_DPM2Parameters dpm2Params;
- NISLANDS_SMC_SWSTATE initialState;
- NISLANDS_SMC_SWSTATE ACPIState;
- NISLANDS_SMC_SWSTATE ULVState;
- NISLANDS_SMC_SWSTATE driverState;
- NISLANDS_SMC_HW_PERFORMANCE_LEVEL dpmLevels[NISLANDS_MAX_SMC_PERFORMANCE_LEVELS_PER_SWSTATE - 1];
+ uint8_t thermalProtectType;
+ uint8_t systemFlags;
+ uint8_t maxVDDCIndexInPPTable;
+ uint8_t extraFlags;
+ uint8_t highSMIO[NISLANDS_MAX_NO_VREG_STEPS];
+ uint32_t lowSMIO[NISLANDS_MAX_NO_VREG_STEPS];
+ NISLANDS_SMC_VOLTAGEMASKTABLE voltageMaskTable;
+ PP_NIslands_DPM2Parameters dpm2Params;
+ struct NISLANDS_SMC_SWSTATE_SINGLE initialState;
+ struct NISLANDS_SMC_SWSTATE_SINGLE ACPIState;
+ struct NISLANDS_SMC_SWSTATE_SINGLE ULVState;
+ NISLANDS_SMC_SWSTATE driverState;
+ NISLANDS_SMC_HW_PERFORMANCE_LEVEL dpmLevels[NISLANDS_MAX_SMC_PERFORMANCE_LEVELS_PER_SWSTATE];
};

typedef struct NISLANDS_SMC_STATETABLE NISLANDS_SMC_STATETABLE;
--
2.27.0

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