drm/amdgpu: used cached pcie gen info for SI (v2)

Rather than querying it every time we need it.
Also fixes a crash in VM pass through if there is no
root bridge because the cached value fetch already checks
this properly.

v2: fix includes

Fixes: https://bugs.freedesktop.org/show_bug.cgi?id=105244
Acked-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Rex Zhu<rezhu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

2 files changed, 23 insertions, 49 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/si.c b/drivers/gpu/drm/amd/amdgpu/si.c
index 543101d5a5ed..2095173aaabf 100644
--- a/drivers/gpu/drm/amd/amdgpu/si.c
+++ b/drivers/gpu/drm/amd/amdgpu/si.c
@@ -31,6 +31,7 @@
 #include "amdgpu_uvd.h"
 #include "amdgpu_vce.h"
 #include "atom.h"
+#include "amd_pcie.h"
 #include "amdgpu_powerplay.h"
 #include "sid.h"
 #include "si_ih.h"
@@ -1461,8 +1462,8 @@ static void si_pcie_gen3_enable(struct amdgpu_device *adev)
 {
         struct pci_dev *root = adev->pdev->bus->self;
         int bridge_pos, gpu_pos;
-        u32 speed_cntl, mask, current_data_rate;
-        int ret, i;
+        u32 speed_cntl, current_data_rate;
+        int i;
         u16 tmp16;
 
         if (pci_is_root_bus(adev->pdev->bus))
@@ -1474,23 +1475,20 @@ static void si_pcie_gen3_enable(struct amdgpu_device *adev)
         if (adev->flags & AMD_IS_APU)
                 return;
 
-        ret = drm_pcie_get_speed_cap_mask(adev->ddev, &mask);
-        if (ret != 0)
-                return;
-
-        if (!(mask & (DRM_PCIE_SPEED_50 | DRM_PCIE_SPEED_80)))
+        if (!(adev->pm.pcie_gen_mask & (CAIL_PCIE_LINK_SPEED_SUPPORT_GEN2 |
+                                        CAIL_PCIE_LINK_SPEED_SUPPORT_GEN3)))
                 return;
 
         speed_cntl = RREG32_PCIE_PORT(PCIE_LC_SPEED_CNTL);
         current_data_rate = (speed_cntl & LC_CURRENT_DATA_RATE_MASK) >>
                 LC_CURRENT_DATA_RATE_SHIFT;
-        if (mask & DRM_PCIE_SPEED_80) {
+        if (adev->pm.pcie_gen_mask & CAIL_PCIE_LINK_SPEED_SUPPORT_GEN3) {
                 if (current_data_rate == 2) {
                         DRM_INFO("PCIE gen 3 link speeds already enabled\n");
                         return;
                 }
                 DRM_INFO("enabling PCIE gen 3 link speeds, disable with amdgpu.pcie_gen2=0\n");
-        } else if (mask & DRM_PCIE_SPEED_50) {
+        } else if (adev->pm.pcie_gen_mask & CAIL_PCIE_LINK_SPEED_SUPPORT_GEN2) {
                 if (current_data_rate == 1) {
                         DRM_INFO("PCIE gen 2 link speeds already enabled\n");
                         return;
@@ -1506,7 +1504,7 @@ static void si_pcie_gen3_enable(struct amdgpu_device *adev)
         if (!gpu_pos)
                 return;
 
-        if (mask & DRM_PCIE_SPEED_80) {
+        if (adev->pm.pcie_gen_mask & CAIL_PCIE_LINK_SPEED_SUPPORT_GEN3) {
                 if (current_data_rate != 2) {
                         u16 bridge_cfg, gpu_cfg;
                         u16 bridge_cfg2, gpu_cfg2;
@@ -1589,9 +1587,9 @@ static void si_pcie_gen3_enable(struct amdgpu_device *adev)
 
         pci_read_config_word(adev->pdev, gpu_pos + PCI_EXP_LNKCTL2, &tmp16);
         tmp16 &= ~0xf;
-        if (mask & DRM_PCIE_SPEED_80)
+        if (adev->pm.pcie_gen_mask & CAIL_PCIE_LINK_SPEED_SUPPORT_GEN3)
                 tmp16 |= 3;
-        else if (mask & DRM_PCIE_SPEED_50)
+        else if (adev->pm.pcie_gen_mask & CAIL_PCIE_LINK_SPEED_SUPPORT_GEN2)
                 tmp16 |= 2;
         else
                 tmp16 |= 1;
diff --git a/drivers/gpu/drm/amd/amdgpu/si_dpm.c b/drivers/gpu/drm/amd/amdgpu/si_dpm.c
index ce675a7f179a..22f0b7ff3ac9 100644
--- a/drivers/gpu/drm/amd/amdgpu/si_dpm.c
+++ b/drivers/gpu/drm/amd/amdgpu/si_dpm.c
@@ -26,6 +26,7 @@
 #include "amdgpu_pm.h"
 #include "amdgpu_dpm.h"
 #include "amdgpu_atombios.h"
+#include "amd_pcie.h"
 #include "sid.h"
 #include "r600_dpm.h"
 #include "si_dpm.h"
@@ -3331,29 +3332,6 @@ static void btc_apply_voltage_delta_rules(struct amdgpu_device *adev,
         }
 }
 
-static enum amdgpu_pcie_gen r600_get_pcie_gen_support(struct amdgpu_device *adev,
-                                               u32 sys_mask,
-                                               enum amdgpu_pcie_gen asic_gen,
-                                               enum amdgpu_pcie_gen default_gen)
-{
-        switch (asic_gen) {
-        case AMDGPU_PCIE_GEN1:
-                return AMDGPU_PCIE_GEN1;
-        case AMDGPU_PCIE_GEN2:
-                return AMDGPU_PCIE_GEN2;
-        case AMDGPU_PCIE_GEN3:
-                return AMDGPU_PCIE_GEN3;
-        default:
-                if ((sys_mask & DRM_PCIE_SPEED_80) && (default_gen == AMDGPU_PCIE_GEN3))
-                        return AMDGPU_PCIE_GEN3;
-                else if ((sys_mask & DRM_PCIE_SPEED_50) && (default_gen == AMDGPU_PCIE_GEN2))
-                        return AMDGPU_PCIE_GEN2;
-                else
-                        return AMDGPU_PCIE_GEN1;
-        }
-        return AMDGPU_PCIE_GEN1;
-}
-
 static void r600_calculate_u_and_p(u32 i, u32 r_c, u32 p_b,
                             u32 *p, u32 *u)
 {
@@ -5028,10 +5006,11 @@ static int si_populate_smc_acpi_state(struct amdgpu_device *adev,
                                                               table->ACPIState.levels[0].vddc.index,
                                                               &table->ACPIState.levels[0].std_vddc);
                 }
-                table->ACPIState.levels[0].gen2PCIE = (u8)r600_get_pcie_gen_support(adev,
-                                                                                    si_pi->sys_pcie_mask,
-                                                                                    si_pi->boot_pcie_gen,
-                                                                                    AMDGPU_PCIE_GEN1);
+                table->ACPIState.levels[0].gen2PCIE =
+                        (u8)amdgpu_get_pcie_gen_support(adev,
+                                                        si_pi->sys_pcie_mask,
+                                                        si_pi->boot_pcie_gen,
+                                                        AMDGPU_PCIE_GEN1);
 
                 if (si_pi->vddc_phase_shed_control)
                         si_populate_phase_shedding_value(adev,
@@ -7168,10 +7147,10 @@ static void si_parse_pplib_clock_info(struct amdgpu_device *adev,
         pl->vddc = le16_to_cpu(clock_info->si.usVDDC);
         pl->vddci = le16_to_cpu(clock_info->si.usVDDCI);
         pl->flags = le32_to_cpu(clock_info->si.ulFlags);
-        pl->pcie_gen = r600_get_pcie_gen_support(adev,
-                                                 si_pi->sys_pcie_mask,
-                                                 si_pi->boot_pcie_gen,
-                                                 clock_info->si.ucPCIEGen);
+        pl->pcie_gen = amdgpu_get_pcie_gen_support(adev,
+                                                   si_pi->sys_pcie_mask,
+                                                   si_pi->boot_pcie_gen,
+                                                   clock_info->si.ucPCIEGen);
 
         /* patch up vddc if necessary */
         ret = si_get_leakage_voltage_from_leakage_index(adev, pl->vddc,
@@ -7326,7 +7305,6 @@ static int si_dpm_init(struct amdgpu_device *adev)
         struct si_power_info *si_pi;
         struct atom_clock_dividers dividers;
         int ret;
-        u32 mask;
 
         si_pi = kzalloc(sizeof(struct si_power_info), GFP_KERNEL);
         if (si_pi == NULL)
@@ -7336,11 +7314,9 @@ static int si_dpm_init(struct amdgpu_device *adev)
         eg_pi = &ni_pi->eg;
         pi = &eg_pi->rv7xx;
 
-        ret = drm_pcie_get_speed_cap_mask(adev->ddev, &mask);
-        if (ret)
-                si_pi->sys_pcie_mask = 0;
-        else
-                si_pi->sys_pcie_mask = mask;
+        si_pi->sys_pcie_mask =
+                (adev->pm.pcie_gen_mask & CAIL_PCIE_LINK_SPEED_SUPPORT_MASK) >>
+                CAIL_PCIE_LINK_SPEED_SUPPORT_SHIFT;
         si_pi->force_pcie_gen = AMDGPU_PCIE_GEN_INVALID;
         si_pi->boot_pcie_gen = si_get_current_pcie_speed(adev);