[PATCH 2/4] drm/radeon: make VM size a module parameter

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From: Christian König <christian.koenig@xxxxxxx>

Signed-off-by: Christian König <christian.koenig@xxxxxxx>
---
 drivers/gpu/drm/radeon/cik.c           |  2 +-
 drivers/gpu/drm/radeon/ni.c            |  3 ++-
 drivers/gpu/drm/radeon/radeon.h        |  2 +-
 drivers/gpu/drm/radeon/radeon_device.c | 27 +++++++++++++++++++++------
 drivers/gpu/drm/radeon/radeon_drv.c    |  4 ++++
 drivers/gpu/drm/radeon/radeon_vm.c     |  6 +++---
 drivers/gpu/drm/radeon/si.c            |  2 +-
 7 files changed, 33 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/radeon/cik.c b/drivers/gpu/drm/radeon/cik.c
index 69a00d6..be464d0 100644
--- a/drivers/gpu/drm/radeon/cik.c
+++ b/drivers/gpu/drm/radeon/cik.c
@@ -5431,7 +5431,7 @@ static int cik_pcie_gart_enable(struct radeon_device *rdev)
 	 */
 	/* set vm size, must be a multiple of 4 */
 	WREG32(VM_CONTEXT1_PAGE_TABLE_START_ADDR, 0);
-	WREG32(VM_CONTEXT1_PAGE_TABLE_END_ADDR, rdev->vm_manager.max_pfn);
+	WREG32(VM_CONTEXT1_PAGE_TABLE_END_ADDR, radeon_vm_size << 8);
 	for (i = 1; i < 16; i++) {
 		if (i < 8)
 			WREG32(VM_CONTEXT0_PAGE_TABLE_BASE_ADDR + (i << 2),
diff --git a/drivers/gpu/drm/radeon/ni.c b/drivers/gpu/drm/radeon/ni.c
index 1d3209f..ff7cbbc 100644
--- a/drivers/gpu/drm/radeon/ni.c
+++ b/drivers/gpu/drm/radeon/ni.c
@@ -1258,7 +1258,8 @@ static int cayman_pcie_gart_enable(struct radeon_device *rdev)
 	 */
 	for (i = 1; i < 8; i++) {
 		WREG32(VM_CONTEXT0_PAGE_TABLE_START_ADDR + (i << 2), 0);
-		WREG32(VM_CONTEXT0_PAGE_TABLE_END_ADDR + (i << 2), rdev->vm_manager.max_pfn);
+		WREG32(VM_CONTEXT0_PAGE_TABLE_END_ADDR + (i << 2),
+		       radeon_vm_size << 8);
 		WREG32(VM_CONTEXT0_PAGE_TABLE_BASE_ADDR + (i << 2),
 			rdev->gart.table_addr >> 12);
 	}
diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index babb7f1..3d8b4fd 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -100,6 +100,7 @@ extern int radeon_dpm;
 extern int radeon_aspm;
 extern int radeon_runtime_pm;
 extern int radeon_hard_reset;
+extern int radeon_vm_size;
 
 /*
  * Copy from radeon_drv.h so we don't have to include both and have conflicting
@@ -893,7 +894,6 @@ struct radeon_vm {
 
 struct radeon_vm_manager {
 	struct radeon_fence		*active[RADEON_NUM_VM];
-	uint32_t			max_pfn;
 	/* number of VMIDs */
 	unsigned			nvm;
 	/* vram base address for page table entry  */
diff --git a/drivers/gpu/drm/radeon/radeon_device.c b/drivers/gpu/drm/radeon/radeon_device.c
index 26e1882..83032a6 100644
--- a/drivers/gpu/drm/radeon/radeon_device.c
+++ b/drivers/gpu/drm/radeon/radeon_device.c
@@ -1052,6 +1052,27 @@ static void radeon_check_arguments(struct radeon_device *rdev)
 		radeon_agpmode = 0;
 		break;
 	}
+
+	if (!radeon_check_pot_argument(radeon_vm_size)) {
+		dev_warn(rdev->dev, "VM size (%d) must be a power of 2\n",
+			 radeon_vm_size);
+		radeon_vm_size = 4096;
+	}
+
+	if (radeon_vm_size < 4) {
+		dev_warn(rdev->dev, "VM size (%d) to small, min is 4MB\n",
+			 radeon_vm_size);
+		radeon_vm_size = 4096;
+	}
+
+	/*
+	 * Max GPUVM size for Cayman, SI and NI are 40 bits.
+	 */
+	if (radeon_vm_size > 1024*1024) {
+		dev_warn(rdev->dev, "VM size (%d) to large, max is 1TB\n",
+			 radeon_vm_size);
+		radeon_vm_size = 4096;
+	}
 }
 
 /**
@@ -1197,12 +1218,6 @@ int radeon_device_init(struct radeon_device *rdev,
 	if (r)
 		return r;
 
-	/* Adjust VM size here.
-	 * Currently set to 4GB ((1 << 20) 4k pages).
-	 * Max GPUVM size for cayman and SI is 40 bits.
-	 */
-	rdev->vm_manager.max_pfn = 1 << 20;
-
 	/* Set asic functions */
 	r = radeon_asic_init(rdev);
 	if (r)
diff --git a/drivers/gpu/drm/radeon/radeon_drv.c b/drivers/gpu/drm/radeon/radeon_drv.c
index 15447a41..a09426c 100644
--- a/drivers/gpu/drm/radeon/radeon_drv.c
+++ b/drivers/gpu/drm/radeon/radeon_drv.c
@@ -172,6 +172,7 @@ int radeon_dpm = -1;
 int radeon_aspm = -1;
 int radeon_runtime_pm = -1;
 int radeon_hard_reset = 0;
+int radeon_vm_size = 4096;
 
 MODULE_PARM_DESC(no_wb, "Disable AGP writeback for scratch registers");
 module_param_named(no_wb, radeon_no_wb, int, 0444);
@@ -239,6 +240,9 @@ module_param_named(runpm, radeon_runtime_pm, int, 0444);
 MODULE_PARM_DESC(hard_reset, "PCI config reset (1 = force enable, 0 = disable (default))");
 module_param_named(hard_reset, radeon_hard_reset, int, 0444);
 
+MODULE_PARM_DESC(vm_size, "VM address space size in megabytes (default 4GB)");
+module_param_named(vm_size, radeon_vm_size, int, 0444);
+
 static struct pci_device_id pciidlist[] = {
 	radeon_PCI_IDS
 };
diff --git a/drivers/gpu/drm/radeon/radeon_vm.c b/drivers/gpu/drm/radeon/radeon_vm.c
index d3c9161..0b1055e 100644
--- a/drivers/gpu/drm/radeon/radeon_vm.c
+++ b/drivers/gpu/drm/radeon/radeon_vm.c
@@ -59,7 +59,7 @@
  */
 static unsigned radeon_vm_num_pdes(struct radeon_device *rdev)
 {
-	return rdev->vm_manager.max_pfn >> RADEON_VM_BLOCK_SIZE;
+	return (radeon_vm_size << 8) >> RADEON_VM_BLOCK_SIZE;
 }
 
 /**
@@ -433,9 +433,9 @@ int radeon_vm_bo_set_addr(struct radeon_device *rdev,
 		}
 
 		last_pfn = eoffset / RADEON_GPU_PAGE_SIZE;
-		if (last_pfn > rdev->vm_manager.max_pfn) {
+		if (last_pfn > (radeon_vm_size << 8)) {
 			dev_err(rdev->dev, "va above limit (0x%08X > 0x%08X)\n",
-				last_pfn, rdev->vm_manager.max_pfn);
+				last_pfn, (radeon_vm_size << 8));
 			return -EINVAL;
 		}
 
diff --git a/drivers/gpu/drm/radeon/si.c b/drivers/gpu/drm/radeon/si.c
index d64ef91..afa2a9b 100644
--- a/drivers/gpu/drm/radeon/si.c
+++ b/drivers/gpu/drm/radeon/si.c
@@ -4076,7 +4076,7 @@ static int si_pcie_gart_enable(struct radeon_device *rdev)
 	/* empty context1-15 */
 	/* set vm size, must be a multiple of 4 */
 	WREG32(VM_CONTEXT1_PAGE_TABLE_START_ADDR, 0);
-	WREG32(VM_CONTEXT1_PAGE_TABLE_END_ADDR, rdev->vm_manager.max_pfn);
+	WREG32(VM_CONTEXT1_PAGE_TABLE_END_ADDR, radeon_vm_size << 8);
 	/* Assign the pt base to something valid for now; the pts used for
 	 * the VMs are determined by the application and setup and assigned
 	 * on the fly in the vm part of radeon_gart.c
-- 
1.9.1

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