diff options
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell_mgr.c')
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell_mgr.c | 230 |
1 files changed, 230 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell_mgr.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell_mgr.c new file mode 100644 index 000000000000..da4be0bbb446 --- /dev/null +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell_mgr.c @@ -0,0 +1,230 @@ +// SPDX-License-Identifier: MIT +/* + * Copyright 2022 Advanced Micro Devices, Inc. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + * + */ + +#include "amdgpu.h" + +/** + * amdgpu_mm_rdoorbell - read a doorbell dword + * + * @adev: amdgpu_device pointer + * @index: doorbell index + * + * Returns the value in the doorbell aperture at the + * requested doorbell index (CIK). + */ +u32 amdgpu_mm_rdoorbell(struct amdgpu_device *adev, u32 index) +{ + if (amdgpu_device_skip_hw_access(adev)) + return 0; + + if (index < adev->doorbell.num_kernel_doorbells) + return readl(adev->doorbell.cpu_addr + index); + + DRM_ERROR("reading beyond doorbell aperture: 0x%08x!\n", index); + return 0; +} + +/** + * amdgpu_mm_wdoorbell - write a doorbell dword + * + * @adev: amdgpu_device pointer + * @index: doorbell index + * @v: value to write + * + * Writes @v to the doorbell aperture at the + * requested doorbell index (CIK). + */ +void amdgpu_mm_wdoorbell(struct amdgpu_device *adev, u32 index, u32 v) +{ + if (amdgpu_device_skip_hw_access(adev)) + return; + + if (index < adev->doorbell.num_kernel_doorbells) + writel(v, adev->doorbell.cpu_addr + index); + else + DRM_ERROR("writing beyond doorbell aperture: 0x%08x!\n", index); +} + +/** + * amdgpu_mm_rdoorbell64 - read a doorbell Qword + * + * @adev: amdgpu_device pointer + * @index: doorbell index + * + * Returns the value in the doorbell aperture at the + * requested doorbell index (VEGA10+). + */ +u64 amdgpu_mm_rdoorbell64(struct amdgpu_device *adev, u32 index) +{ + if (amdgpu_device_skip_hw_access(adev)) + return 0; + + if (index < adev->doorbell.num_kernel_doorbells) + return atomic64_read((atomic64_t *)(adev->doorbell.cpu_addr + index)); + + DRM_ERROR("reading beyond doorbell aperture: 0x%08x!\n", index); + return 0; +} + +/** + * amdgpu_mm_wdoorbell64 - write a doorbell Qword + * + * @adev: amdgpu_device pointer + * @index: doorbell index + * @v: value to write + * + * Writes @v to the doorbell aperture at the + * requested doorbell index (VEGA10+). + */ +void amdgpu_mm_wdoorbell64(struct amdgpu_device *adev, u32 index, u64 v) +{ + if (amdgpu_device_skip_hw_access(adev)) + return; + + if (index < adev->doorbell.num_kernel_doorbells) + atomic64_set((atomic64_t *)(adev->doorbell.cpu_addr + index), v); + else + DRM_ERROR("writing beyond doorbell aperture: 0x%08x!\n", index); +} + +/** + * amdgpu_doorbell_index_on_bar - Find doorbell's absolute offset in BAR + * + * @adev: amdgpu_device pointer + * @db_bo: doorbell object's bo + * @db_index: doorbell relative index in this doorbell object + * + * returns doorbell's absolute index in BAR + */ +uint32_t amdgpu_doorbell_index_on_bar(struct amdgpu_device *adev, + struct amdgpu_bo *db_bo, + uint32_t doorbell_index) +{ + int db_bo_offset; + + db_bo_offset = amdgpu_bo_gpu_offset_no_check(db_bo); + + /* doorbell index is 32 bit but doorbell's size is 64-bit, so *2 */ + return db_bo_offset / sizeof(u32) + doorbell_index * 2; +} + +/** + * amdgpu_doorbell_create_kernel_doorbells - Create kernel doorbells for graphics + * + * @adev: amdgpu_device pointer + * + * Creates doorbells for graphics driver usages. + * returns 0 on success, error otherwise. + */ +int amdgpu_doorbell_create_kernel_doorbells(struct amdgpu_device *adev) +{ + int r; + int size; + + /* Reserve first num_kernel_doorbells (page-aligned) for kernel ops */ + size = ALIGN(adev->doorbell.num_kernel_doorbells * sizeof(u32), PAGE_SIZE); + + /* Allocate an extra page for MES kernel usages (ring test) */ + adev->mes.db_start_dw_offset = size / sizeof(u32); + size += PAGE_SIZE; + + r = amdgpu_bo_create_kernel(adev, + size, + PAGE_SIZE, + AMDGPU_GEM_DOMAIN_DOORBELL, + &adev->doorbell.kernel_doorbells, + NULL, + (void **)&adev->doorbell.cpu_addr); + if (r) { + DRM_ERROR("Failed to allocate kernel doorbells, err=%d\n", r); + return r; + } + + adev->doorbell.num_kernel_doorbells = size / sizeof(u32); + return 0; +} + +/* + * GPU doorbell aperture helpers function. + */ +/** + * amdgpu_doorbell_init - Init doorbell driver information. + * + * @adev: amdgpu_device pointer + * + * Init doorbell driver information (CIK) + * Returns 0 on success, error on failure. + */ +int amdgpu_doorbell_init(struct amdgpu_device *adev) +{ + + /* No doorbell on SI hardware generation */ + if (adev->asic_type < CHIP_BONAIRE) { + adev->doorbell.base = 0; + adev->doorbell.size = 0; + adev->doorbell.num_kernel_doorbells = 0; + return 0; + } + + if (pci_resource_flags(adev->pdev, 2) & IORESOURCE_UNSET) + return -EINVAL; + + amdgpu_asic_init_doorbell_index(adev); + + /* doorbell bar mapping */ + adev->doorbell.base = pci_resource_start(adev->pdev, 2); + adev->doorbell.size = pci_resource_len(adev->pdev, 2); + + adev->doorbell.num_kernel_doorbells = + min_t(u32, adev->doorbell.size / sizeof(u32), + adev->doorbell_index.max_assignment + 1); + if (adev->doorbell.num_kernel_doorbells == 0) + return -EINVAL; + + /* + * For Vega, reserve and map two pages on doorbell BAR since SDMA + * paging queue doorbell use the second page. The + * AMDGPU_DOORBELL64_MAX_ASSIGNMENT definition assumes all the + * doorbells are in the first page. So with paging queue enabled, + * the max num_kernel_doorbells should + 1 page (0x400 in dword) + */ + if (adev->asic_type >= CHIP_VEGA10) + adev->doorbell.num_kernel_doorbells += 0x400; + + return 0; +} + +/** + * amdgpu_doorbell_fini - Tear down doorbell driver information. + * + * @adev: amdgpu_device pointer + * + * Tear down doorbell driver information (CIK) + */ +void amdgpu_doorbell_fini(struct amdgpu_device *adev) +{ + amdgpu_bo_free_kernel(&adev->doorbell.kernel_doorbells, + NULL, + (void **)&adev->doorbell.cpu_addr); +} |