1 // SPDX-License-Identifier: MIT 2 /* 3 * Copyright 2023, Intel Corporation. 4 */ 5 6 #include <drm/intel/display_parent_interface.h> 7 8 #include "xe_bo.h" 9 #include "xe_device.h" 10 #include "xe_device_types.h" 11 #include "xe_dsb_buffer.h" 12 13 struct intel_dsb_buffer { 14 u32 *cmd_buf; 15 struct xe_bo *bo; 16 size_t buf_size; 17 }; 18 19 static u32 xe_dsb_buffer_ggtt_offset(struct intel_dsb_buffer *dsb_buf) 20 { 21 return xe_bo_ggtt_addr(dsb_buf->bo); 22 } 23 24 static void xe_dsb_buffer_write(struct intel_dsb_buffer *dsb_buf, u32 idx, u32 val) 25 { 26 iosys_map_wr(&dsb_buf->bo->vmap, idx * 4, u32, val); 27 } 28 29 static u32 xe_dsb_buffer_read(struct intel_dsb_buffer *dsb_buf, u32 idx) 30 { 31 return iosys_map_rd(&dsb_buf->bo->vmap, idx * 4, u32); 32 } 33 34 static void xe_dsb_buffer_fill(struct intel_dsb_buffer *dsb_buf, u32 idx, u32 val, size_t size) 35 { 36 WARN_ON(idx > (dsb_buf->buf_size - size) / sizeof(*dsb_buf->cmd_buf)); 37 38 iosys_map_memset(&dsb_buf->bo->vmap, idx * 4, val, size); 39 } 40 41 static struct intel_dsb_buffer *xe_dsb_buffer_create(struct drm_device *drm, size_t size) 42 { 43 struct xe_device *xe = to_xe_device(drm); 44 struct intel_dsb_buffer *dsb_buf; 45 struct xe_bo *obj; 46 int ret; 47 48 dsb_buf = kzalloc_obj(*dsb_buf); 49 if (!dsb_buf) 50 return ERR_PTR(-ENOMEM); 51 52 /* Set scanout flag for WC mapping */ 53 obj = xe_bo_create_pin_map_novm(xe, xe_device_get_root_tile(xe), 54 PAGE_ALIGN(size), 55 ttm_bo_type_kernel, 56 XE_BO_FLAG_VRAM_IF_DGFX(xe_device_get_root_tile(xe)) | 57 XE_BO_FLAG_SCANOUT | XE_BO_FLAG_GGTT, false); 58 if (IS_ERR(obj)) { 59 ret = PTR_ERR(obj); 60 goto err_pin_map; 61 } 62 63 dsb_buf->bo = obj; 64 dsb_buf->buf_size = size; 65 66 return dsb_buf; 67 68 err_pin_map: 69 kfree(dsb_buf); 70 71 return ERR_PTR(ret); 72 } 73 74 static void xe_dsb_buffer_cleanup(struct intel_dsb_buffer *dsb_buf) 75 { 76 xe_bo_unpin_map_no_vm(dsb_buf->bo); 77 kfree(dsb_buf); 78 } 79 80 static void xe_dsb_buffer_flush_map(struct intel_dsb_buffer *dsb_buf) 81 { 82 struct xe_device *xe = dsb_buf->bo->tile->xe; 83 84 /* 85 * The memory barrier here is to ensure coherency of DSB vs MMIO, 86 * both for weak ordering archs and discrete cards. 87 */ 88 xe_device_wmb(xe); 89 xe_device_l2_flush(xe); 90 } 91 92 const struct intel_display_dsb_interface xe_display_dsb_interface = { 93 .ggtt_offset = xe_dsb_buffer_ggtt_offset, 94 .write = xe_dsb_buffer_write, 95 .read = xe_dsb_buffer_read, 96 .fill = xe_dsb_buffer_fill, 97 .create = xe_dsb_buffer_create, 98 .cleanup = xe_dsb_buffer_cleanup, 99 .flush_map = xe_dsb_buffer_flush_map, 100 }; 101