drm/amdgpu: Add API to get tmr info from acpi

In certain configs, TMR information is available from ACPI. Add API to
fetch the information.

Signed-off-by: Lijo Lazar <lijo.lazar@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index 880bf9d..f4461bc 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -1400,6 +1400,8 @@ int amdgpu_acpi_power_shift_control(struct amdgpu_device *adev,
                                    u8 dev_state, bool drv_state);
 int amdgpu_acpi_smart_shift_update(struct drm_device *dev, enum amdgpu_ss ss_state);
 int amdgpu_acpi_pcie_notify_device_ready(struct amdgpu_device *adev);
+int amdgpu_acpi_get_tmr_info(struct amdgpu_device *adev, u64 *tmr_offset,
+                            u64 *tmr_size);
 
 void amdgpu_acpi_get_backlight_caps(struct amdgpu_dm_backlight_caps *caps);
 bool amdgpu_acpi_should_gpu_reset(struct amdgpu_device *adev);
@@ -1407,6 +1409,11 @@ void amdgpu_acpi_detect(void);
 void amdgpu_acpi_release(void);
 #else
 static inline int amdgpu_acpi_init(struct amdgpu_device *adev) { return 0; }
+static inline int amdgpu_acpi_get_tmr_info(struct amdgpu_device *adev,
+                                          u64 *tmr_offset, u64 *tmr_size)
+{
+       return -EINVAL;
+}
 static inline void amdgpu_acpi_fini(struct amdgpu_device *adev) { }
 static inline bool amdgpu_acpi_should_gpu_reset(struct amdgpu_device *adev) { return false; }
 static inline void amdgpu_acpi_detect(void) { }

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
index a3a2ef4..9dbdd69 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
@@ -1072,6 +1072,26 @@ static int amdgpu_acpi_enumerate_xcc(void)
        return 0;
 }
 
+int amdgpu_acpi_get_tmr_info(struct amdgpu_device *adev, u64 *tmr_offset,
+                            u64 *tmr_size)
+{
+       struct amdgpu_acpi_dev_info *dev_info;
+       u16 bdf;
+
+       if (!tmr_offset || !tmr_size)
+               return -EINVAL;
+
+       bdf = (adev->pdev->bus->number << 8) | adev->pdev->devfn;
+       dev_info = amdgpu_acpi_get_dev(bdf);
+       if (!dev_info)
+               return -ENOENT;
+
+       *tmr_offset = dev_info->tmr_base;
+       *tmr_size = dev_info->tmr_size;
+
+       return 0;
+}
+
 /**
  * amdgpu_acpi_event - handle notify events
  *