linux-kernel - [PATCH 4.14 65/95] drm/amdgpu: Properly allocate VM invalidate eng v2

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Date:   Mon,  4 Dec 2017 17:00:29 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Oak Zeng <Oak.Zeng@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian Konig <christian.koenig@....com>
Subject: [PATCH 4.14 65/95] drm/amdgpu: Properly allocate VM invalidate eng v2

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: ozeng <oak.zeng@....com>

commit c5066129af4436ab0da8eefe4289774a5409706d upstream.

v1: Properly allocate TLB invalidation engine to avoid conflict.
v2: Added comments to codes

Signed-off-by: Oak Zeng <Oak.Zeng@....com>
Reviewed-by: Alex Deucher <alexander.deucher@....com>
Acked-by: Christian Konig <christian.koenig@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c |   15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

--- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
@@ -395,7 +395,16 @@ static int gmc_v9_0_early_init(void *han
 static int gmc_v9_0_late_init(void *handle)
 {
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
-	unsigned vm_inv_eng[AMDGPU_MAX_VMHUBS] = { 3, 3 };
+	/*
+	 * The latest engine allocation on gfx9 is:
+	 * Engine 0, 1: idle
+	 * Engine 2, 3: firmware
+	 * Engine 4~13: amdgpu ring, subject to change when ring number changes
+	 * Engine 14~15: idle
+	 * Engine 16: kfd tlb invalidation
+	 * Engine 17: Gart flushes
+	 */
+	unsigned vm_inv_eng[AMDGPU_MAX_VMHUBS] = { 4, 4 };
 	unsigned i;
 
 	for(i = 0; i < adev->num_rings; ++i) {
@@ -408,9 +417,9 @@ static int gmc_v9_0_late_init(void *hand
 			 ring->funcs->vmhub);
 	}
 
-	/* Engine 17 is used for GART flushes */
+	/* Engine 16 is used for KFD and 17 for GART flushes */
 	for(i = 0; i < AMDGPU_MAX_VMHUBS; ++i)
-		BUG_ON(vm_inv_eng[i] > 17);
+		BUG_ON(vm_inv_eng[i] > 16);
 
 	return amdgpu_irq_get(adev, &adev->mc.vm_fault, 0);
 }