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From 89c5d94ac1687ff38fc3ef5ada7772be1d0eb5c1 Mon Sep 17 00:00:00 2001
From: Kent Russell <kent.russell@amd.com>
Date: Fri, 23 Feb 2018 11:49:46 -0500
Subject: [PATCH 3705/4131] drm/amdgpu: Compute GPU VM space if unchanged from
default
Change-Id: I9a20db93c2ad75a0cd07c7d084e9faee5d554cf4
Signed-off-by: Kent Russell <kent.russell@amd.com>
Signed-off-by: Kalyan Alle <kalyan.alle@amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 29 ++++++++++++++++++++++++++---
1 file changed, 26 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index e8501a4..953d2fb 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -763,9 +763,32 @@ static void amdgpu_device_check_block_size(struct amdgpu_device *adev)
static void amdgpu_device_check_vm_size(struct amdgpu_device *adev)
{
- /* no need to check the default value */
- if (amdgpu_vm_size == -1)
- return;
+ struct sysinfo si;
+ int phys_ram_gb, amdgpu_vm_size_aligned;
+
+ /* Compute the GPU VM space only if the user
+ * hasn't changed it from the default.
+ * In order for Raven ATC memory to work, vm size should be 256TB.
+ * So we do not compute the new vm size here for Raven.
+ */
+ if (amdgpu_vm_size == -1 && adev->asic_type != CHIP_RAVEN) {
+ /* Computation depends on the amount of physical RAM available.
+ * Cannot exceed 1TB.
+ */
+ si_meminfo(&si);
+ phys_ram_gb = ((uint64_t)si.totalram * si.mem_unit) >> 30;
+ amdgpu_vm_size = min(phys_ram_gb * 3 + 16, 1024);
+
+ /* GPUVM sizes are almost never perfect powers of two.
+ * Round up to nearest power of two starting from
+ * the minimum allowed but aligned size of 32GB
+ */
+ amdgpu_vm_size_aligned = 32;
+ while (amdgpu_vm_size > amdgpu_vm_size_aligned)
+ amdgpu_vm_size_aligned *= 2;
+
+ amdgpu_vm_size = amdgpu_vm_size_aligned;
+ }
if (amdgpu_vm_size != -1 && amdgpu_vm_size < 1) {
dev_warn(adev->dev, "VM size (%d) too small, min is 1GB\n",
--
2.7.4
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