drm/amdgpu/gmc: add new helper to get the FB size used by pre-OS console

This adds a new gmc callback to get the size reserved by the pre-OS
console and provides a helper function for use by gmc IP drivers.

Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
index 21d2c85..fc9e18a 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
@@ -27,6 +27,7 @@
 #include <linux/io-64-nonatomic-lo-hi.h>
 
 #include "amdgpu.h"
+#include "amdgpu_gmc.h"
 #include "amdgpu_ras.h"
 #include "amdgpu_xgmi.h"
 
@@ -431,3 +432,45 @@ void amdgpu_gmc_set_vm_fault_masks(struct amdgpu_device *adev, int hub_type,
                WREG32(reg, tmp);
        }
 }
+
+void amdgpu_gmc_get_vbios_allocations(struct amdgpu_device *adev)
+{
+       unsigned size;
+
+       /*
+        * TODO:
+        * Currently there is a bug where some memory client outside
+        * of the driver writes to first 8M of VRAM on S3 resume,
+        * this overrides GART which by default gets placed in first 8M and
+        * causes VM_FAULTS once GTT is accessed.
+        * Keep the stolen memory reservation until the while this is not solved.
+        */
+       switch (adev->asic_type) {
+       case CHIP_VEGA10:
+       case CHIP_RAVEN:
+       case CHIP_ARCTURUS:
+       case CHIP_RENOIR:
+               adev->gmc.keep_stolen_vga_memory = true;
+               break;
+       default:
+               adev->gmc.keep_stolen_vga_memory = false;
+               break;
+       }
+
+       if (!amdgpu_device_ip_get_ip_block(adev, AMD_IP_BLOCK_TYPE_DCE))
+               size = 0;
+       else
+               size = amdgpu_gmc_get_vbios_fb_size(adev);
+
+       /* set to 0 if the pre-OS buffer uses up most of vram */
+       if ((adev->gmc.real_vram_size - size) < (8 * 1024 * 1024))
+               size = 0;
+
+       if (size > AMDGPU_VBIOS_VGA_ALLOCATION) {
+               adev->gmc.stolen_vga_size = AMDGPU_VBIOS_VGA_ALLOCATION;
+               adev->gmc.stolen_extended_size = size - adev->gmc.stolen_vga_size;
+       } else {
+               adev->gmc.stolen_vga_size = size;
+               adev->gmc.stolen_extended_size = 0;
+       }
+}

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h
index 8f4af95..c2a85d0 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h
@@ -131,6 +131,8 @@ struct amdgpu_gmc_funcs {
        void (*get_vm_pte)(struct amdgpu_device *adev,
                           struct amdgpu_bo_va_mapping *mapping,
                           uint64_t *flags);
+       /* get the amount of memory used by the vbios for pre-OS console */
+       unsigned int (*get_vbios_fb_size)(struct amdgpu_device *adev);
 };
 
 struct amdgpu_xgmi {
@@ -253,6 +255,7 @@ struct amdgpu_gmc {
 #define amdgpu_gmc_map_mtype(adev, flags) (adev)->gmc.gmc_funcs->map_mtype((adev),(flags))
 #define amdgpu_gmc_get_vm_pde(adev, level, dst, flags) (adev)->gmc.gmc_funcs->get_vm_pde((adev), (level), (dst), (flags))
 #define amdgpu_gmc_get_vm_pte(adev, mapping, flags) (adev)->gmc.gmc_funcs->get_vm_pte((adev), (mapping), (flags))
+#define amdgpu_gmc_get_vbios_fb_size(adev) (adev)->gmc.gmc_funcs->get_vbios_fb_size((adev))
 
 /**
  * amdgpu_gmc_vram_full_visible - Check if full VRAM is visible through the BAR
@@ -307,4 +310,6 @@ extern void
 amdgpu_gmc_set_vm_fault_masks(struct amdgpu_device *adev, int hub_type,
                              bool enable);
 
+void amdgpu_gmc_get_vbios_allocations(struct amdgpu_device *adev);
+
 #endif