1 /* $NetBSD: amdgpu_gfx.c,v 1.3 2018/08/27 14:04:50 riastradh Exp $ */ 2 3 /* 4 * Copyright 2014 Advanced Micro Devices, Inc. 5 * Copyright 2008 Red Hat Inc. 6 * Copyright 2009 Jerome Glisse. 7 * 8 * Permission is hereby granted, free of charge, to any person obtaining a 9 * copy of this software and associated documentation files (the "Software"), 10 * to deal in the Software without restriction, including without limitation 11 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 12 * and/or sell copies of the Software, and to permit persons to whom the 13 * Software is furnished to do so, subject to the following conditions: 14 * 15 * The above copyright notice and this permission notice shall be included in 16 * all copies or substantial portions of the Software. 17 * 18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 21 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 22 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 23 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 24 * OTHER DEALINGS IN THE SOFTWARE. 25 * 26 */ 27 #include <sys/cdefs.h> 28 __KERNEL_RCSID(0, "$NetBSD: amdgpu_gfx.c,v 1.3 2018/08/27 14:04:50 riastradh Exp $"); 29 30 #include <drm/drmP.h> 31 #include "amdgpu.h" 32 #include "amdgpu_gfx.h" 33 34 /* 35 * GPU scratch registers helpers function. 36 */ 37 /** 38 * amdgpu_gfx_scratch_get - Allocate a scratch register 39 * 40 * @adev: amdgpu_device pointer 41 * @reg: scratch register mmio offset 42 * 43 * Allocate a CP scratch register for use by the driver (all asics). 44 * Returns 0 on success or -EINVAL on failure. 45 */ 46 int amdgpu_gfx_scratch_get(struct amdgpu_device *adev, uint32_t *reg) 47 { 48 int i; 49 50 for (i = 0; i < adev->gfx.scratch.num_reg; i++) { 51 if (adev->gfx.scratch.free[i]) { 52 adev->gfx.scratch.free[i] = false; 53 *reg = adev->gfx.scratch.reg[i]; 54 return 0; 55 } 56 } 57 return -EINVAL; 58 } 59 60 /** 61 * amdgpu_gfx_scratch_free - Free a scratch register 62 * 63 * @adev: amdgpu_device pointer 64 * @reg: scratch register mmio offset 65 * 66 * Free a CP scratch register allocated for use by the driver (all asics) 67 */ 68 void amdgpu_gfx_scratch_free(struct amdgpu_device *adev, uint32_t reg) 69 { 70 int i; 71 72 for (i = 0; i < adev->gfx.scratch.num_reg; i++) { 73 if (adev->gfx.scratch.reg[i] == reg) { 74 adev->gfx.scratch.free[i] = true; 75 return; 76 } 77 } 78 } 79