442 lines
13 KiB
C
442 lines
13 KiB
C
/*
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* SPDX-FileCopyrightText: Copyright (c) 2017-2019 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
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* SPDX-License-Identifier: MIT
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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/*
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* nv-ibmnpu.c - interface with the ibmnpu (IBM NVLink Processing Unit) "module"
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*/
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#include "nv-linux.h"
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#if defined(NVCPU_PPC64LE)
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#include "nv-ibmnpu.h"
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#include "nv-rsync.h"
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/*
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* Temporary query to get the L1D cache block size directly from the device
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* tree for the offline cache flush workaround, since the ppc64_caches symbol
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* is unavailable to us.
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*/
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const NvU32 P9_L1D_CACHE_DEFAULT_BLOCK_SIZE = 0x80;
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static NvU32 nv_ibm_get_cpu_l1d_cache_block_size(void)
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{
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const __be32 *block_size_prop;
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/*
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* Attempt to look up the block size from device tree. If unavailable, just
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* return the default that we see on these systems.
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*/
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struct device_node *cpu = of_find_node_by_type(NULL, "cpu");
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if (!cpu)
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{
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return P9_L1D_CACHE_DEFAULT_BLOCK_SIZE;
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}
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block_size_prop = of_get_property(cpu, "d-cache-block-size", NULL);
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if (!block_size_prop)
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{
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return P9_L1D_CACHE_DEFAULT_BLOCK_SIZE;
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}
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return be32_to_cpu(*block_size_prop);
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}
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/*
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* GPU device memory can be exposed to the kernel as NUMA node memory via the
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* IBMNPU devices associated with the GPU. The platform firmware will specify
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* the parameters of where the memory lives in the system address space via
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* firmware properties on the IBMNPU devices. These properties specify what
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* memory can be accessed through the IBMNPU device, and the driver can online
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* a GPU device's memory into the range accessible by its associated IBMNPU
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* devices.
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*
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* This function calls over to the IBMNPU driver to query the parameters from
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* firmware, and validates that the resulting parameters are acceptable.
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*/
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static void nv_init_ibmnpu_numa_info(nv_state_t *nv)
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{
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nv_linux_state_t *nvl = NV_GET_NVL_FROM_NV_STATE(nv);
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nv_npu_numa_info_t *npu_numa_info = &nvl->npu->numa_info;
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struct pci_dev *npu_dev = nvl->npu->devs[0];
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NvU64 spa, gpa, aper_size;
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/*
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* Terminology:
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* - system physical address (spa): 47-bit NVIDIA physical address, which
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* is the CPU real address with the NVLink address compression scheme
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* already applied in firmware.
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* - guest physical address (gpa): 56-bit physical address as seen by the
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* operating system. This is the base address that we should use for
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* onlining device memory.
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*/
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nvl->numa_info.node_id = ibmnpu_device_get_memory_config(npu_dev, &spa, &gpa,
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&aper_size);
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if (nvl->numa_info.node_id == NUMA_NO_NODE)
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{
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NV_DEV_PRINTF(NV_DBG_SETUP, nv, "No NUMA memory aperture found\n");
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return;
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}
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/* Validate that the compressed system physical address is not too wide */
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if (spa & (~(BIT_ULL(nv_volta_dma_addr_size) - 1)))
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{
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NV_DEV_PRINTF(NV_DBG_ERRORS, nv,
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"Invalid NUMA memory system pa 0x%llx"
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" on IBM-NPU device %04x:%02x:%02x.%u\n",
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spa, NV_PCI_DOMAIN_NUMBER(npu_dev), NV_PCI_BUS_NUMBER(npu_dev),
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NV_PCI_SLOT_NUMBER(npu_dev), PCI_FUNC(npu_dev->devfn));
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goto invalid_numa_config;
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}
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/*
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* Validate that the guest physical address is aligned to 128GB.
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* This alignment requirement comes from the Volta address space
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* size on POWER9.
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*/
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if (!IS_ALIGNED(gpa, BIT_ULL(nv_volta_addr_space_width)))
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{
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NV_DEV_PRINTF(NV_DBG_ERRORS, nv,
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"Invalid alignment in NUMA memory guest pa 0x%llx"
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" on IBM-NPU device %04x:%02x:%02x.%u\n",
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gpa, NV_PCI_DOMAIN_NUMBER(npu_dev), NV_PCI_BUS_NUMBER(npu_dev),
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NV_PCI_SLOT_NUMBER(npu_dev), PCI_FUNC(npu_dev->devfn));
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goto invalid_numa_config;
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}
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/* Validate that the aperture can map all of the device's framebuffer */
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if (aper_size < nv->fb->size)
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{
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NV_DEV_PRINTF(NV_DBG_ERRORS, nv,
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"Insufficient NUMA memory aperture size 0x%llx"
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" on IBM-NPU device %04x:%02x:%02x.%u (0x%llx required)\n",
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aper_size, NV_PCI_DOMAIN_NUMBER(npu_dev),
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NV_PCI_BUS_NUMBER(npu_dev), NV_PCI_SLOT_NUMBER(npu_dev),
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PCI_FUNC(npu_dev->devfn), nv->fb->size);
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goto invalid_numa_config;
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}
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npu_numa_info->compr_sys_phys_addr = spa;
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npu_numa_info->guest_phys_addr = gpa;
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if (NVreg_EnableUserNUMAManagement)
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{
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NV_ATOMIC_SET(nvl->numa_info.status, NV_IOCTL_NUMA_STATUS_OFFLINE);
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}
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else
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{
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NV_DEV_PRINTF(NV_DBG_SETUP, nv, "User-mode NUMA onlining disabled.\n");
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nvl->numa_info.node_id = NUMA_NO_NODE;
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}
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NV_DEV_PRINTF(NV_DBG_SETUP, nv, "NUMA memory aperture: "
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"[spa = 0x%llx, gpa = 0x%llx, aper_size = 0x%llx]\n",
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spa, gpa, aper_size);
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/* Get the CPU's L1D cache block size for offlining cache flush */
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npu_numa_info->l1d_cache_block_size = nv_ibm_get_cpu_l1d_cache_block_size();
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return;
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invalid_numa_config:
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NV_DEV_PRINTF(NV_DBG_ERRORS, nv,
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"NUMA memory aperture disabled due to invalid firmware configuration\n");
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nvl->numa_info.node_id = NUMA_NO_NODE;
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}
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void nv_init_ibmnpu_info(nv_state_t *nv)
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{
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#if defined(NV_PNV_PCI_GET_NPU_DEV_PRESENT)
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nv_linux_state_t *nvl = NV_GET_NVL_FROM_NV_STATE(nv);
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struct pci_dev *npu_dev = pnv_pci_get_npu_dev(nvl->pci_dev, 0);
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NvU8 dev_count;
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if (!npu_dev)
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{
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return;
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}
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if (os_alloc_mem((void **)&nvl->npu, sizeof(nv_ibmnpu_info_t)) != NV_OK)
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{
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return;
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}
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os_mem_set(nvl->npu, 0, sizeof(nv_ibmnpu_info_t));
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/* Find any other IBMNPU devices attached to this GPU */
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for (nvl->npu->devs[0] = npu_dev, dev_count = 1;
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dev_count < NV_MAX_ATTACHED_IBMNPUS; dev_count++)
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{
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nvl->npu->devs[dev_count] = pnv_pci_get_npu_dev(nvl->pci_dev, dev_count);
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if (!nvl->npu->devs[dev_count])
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{
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break;
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}
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}
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nvl->npu->dev_count = dev_count;
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/*
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* If we run out of space for IBMNPU devices, NV_MAX_ATTACHED_IBMNPUS will
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* need to be bumped.
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*/
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WARN_ON((dev_count == NV_MAX_ATTACHED_IBMNPUS) &&
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pnv_pci_get_npu_dev(nvl->pci_dev, dev_count));
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ibmnpu_device_get_genregs_info(npu_dev, &nvl->npu->genregs);
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if (nvl->npu->genregs.size > 0)
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{
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NV_DEV_PRINTF(NV_DBG_SETUP, nv,
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"IBM-NPU device %04x:%02x:%02x.%u associated with GPU "
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" has a generation register space 0x%llx-0x%llx\n",
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NV_PCI_DOMAIN_NUMBER(npu_dev), NV_PCI_BUS_NUMBER(npu_dev),
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NV_PCI_SLOT_NUMBER(npu_dev), PCI_FUNC(npu_dev->devfn),
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nvl->npu->genregs.start_addr,
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nvl->npu->genregs.start_addr + nvl->npu->genregs.size - 1);
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}
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else
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{
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NV_DEV_PRINTF(NV_DBG_SETUP, nv,
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"IBM-NPU device %04x:%02x:%02x.%u associated with GPU "
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"does not support generation registers\n",
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NV_PCI_DOMAIN_NUMBER(npu_dev), NV_PCI_BUS_NUMBER(npu_dev),
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NV_PCI_SLOT_NUMBER(npu_dev), PCI_FUNC(npu_dev->devfn));
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}
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nv_init_ibmnpu_numa_info(nv);
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#endif
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}
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void nv_destroy_ibmnpu_info(nv_state_t *nv)
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{
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nv_linux_state_t *nvl = NV_GET_NVL_FROM_NV_STATE(nv);
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if (nvl->npu != NULL)
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{
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os_free_mem(nvl->npu);
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nvl->npu = NULL;
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}
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}
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int nv_init_ibmnpu_devices(nv_state_t *nv)
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{
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NvU8 i;
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nv_linux_state_t *nvl = NV_GET_NVL_FROM_NV_STATE(nv);
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if (!nvl->npu)
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{
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return 0;
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}
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for (i = 0; i < nvl->npu->dev_count; i++)
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{
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NV_DEV_PRINTF(NV_DBG_SETUP, nv,
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"Initializing IBM-NPU device %04x:%02x:%02x.%u\n",
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NV_PCI_DOMAIN_NUMBER(nvl->npu->devs[i]),
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NV_PCI_BUS_NUMBER(nvl->npu->devs[i]),
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NV_PCI_SLOT_NUMBER(nvl->npu->devs[i]),
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PCI_FUNC(nvl->npu->devs[i]->devfn));
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if (ibmnpu_init_device(nvl->npu->devs[i]) != NVL_SUCCESS)
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{
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nv_unregister_ibmnpu_devices(nv);
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return -EIO;
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}
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nvl->npu->initialized_dev_count++;
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}
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return 0;
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}
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void nv_unregister_ibmnpu_devices(nv_state_t *nv)
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{
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NvU8 i;
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nv_linux_state_t *nvl = NV_GET_NVL_FROM_NV_STATE(nv);
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if (!nvl->npu)
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{
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return;
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}
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for (i = 0; i < nvl->npu->initialized_dev_count; i++)
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{
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NV_DEV_PRINTF(NV_DBG_SETUP, nv,
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"Unregistering IBM-NPU device %04x:%02x:%02x.%u\n",
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NV_PCI_DOMAIN_NUMBER(nvl->npu->devs[i]),
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NV_PCI_BUS_NUMBER(nvl->npu->devs[i]),
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NV_PCI_SLOT_NUMBER(nvl->npu->devs[i]),
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PCI_FUNC(nvl->npu->devs[i]->devfn));
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ibmnpu_unregister_device(nvl->npu->devs[i]);
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}
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nvl->npu->initialized_dev_count = 0;
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}
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NV_STATUS NV_API_CALL nv_get_ibmnpu_genreg_info(nv_state_t *nv, NvU64 *addr,
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NvU64 *size, void **device)
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{
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nv_linux_state_t *nvl = NV_GET_NVL_FROM_NV_STATE(nv);
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if (nvl->npu == NULL || nvl->npu->genregs.size == 0)
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{
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return NV_ERR_NOT_SUPPORTED;
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}
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if (addr)
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{
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*addr = nvl->npu->genregs.start_addr;
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}
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if (size)
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{
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*size = nvl->npu->genregs.size;
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}
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if (device)
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{
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*device = (void*)nvl->npu->devs[0];
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}
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return NV_OK;
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}
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NV_STATUS NV_API_CALL nv_get_ibmnpu_relaxed_ordering_mode(nv_state_t *nv,
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NvBool *mode)
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{
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nv_linux_state_t *nvl = NV_GET_NVL_FROM_NV_STATE(nv);
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if (nvl->npu == NULL || nvl->npu->genregs.size == 0)
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{
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return NV_ERR_NOT_SUPPORTED;
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}
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*mode = nv_get_rsync_relaxed_ordering_mode(nv);
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return NV_OK;
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}
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void NV_API_CALL nv_wait_for_ibmnpu_rsync(nv_state_t *nv)
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{
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nv_linux_state_t *nvl = NV_GET_NVL_FROM_NV_STATE(nv);
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if (nvl->npu == NULL || nvl->npu->genregs.size == 0)
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{
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return;
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}
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nv_wait_for_rsync(nv);
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}
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int nv_get_ibmnpu_chip_id(nv_state_t *nv)
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{
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nv_linux_state_t *nvl = NV_GET_NVL_FROM_NV_STATE(nv);
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if (nvl->npu == NULL)
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{
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return -1;
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}
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return ibmnpu_device_get_chip_id(nvl->npu->devs[0]);
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}
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void NV_API_CALL nv_ibmnpu_cache_flush_range(nv_state_t *nv, NvU64 cpu_virtual, NvU64 size)
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{
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nv_linux_state_t *nvl = NV_GET_NVL_FROM_NV_STATE(nv);
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NvU64 offset, cbsize;
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/*
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* The range is commonly an ioremap()ed mapping of the GPU's ATS range and
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* needs to be compared against the created mappings. Alternatively, kernel
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* page tables can be dumped through sysfs if CONFIG_PPC_PTDUMP is enabled.
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*/
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NV_DEV_PRINTF(NV_DBG_INFO, nv,
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"Flushing CPU virtual range [0x%llx, 0x%llx)\n",
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cpu_virtual, cpu_virtual + size);
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cbsize = nvl->npu->numa_info.l1d_cache_block_size;
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CACHE_FLUSH();
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/* Force eviction of any cache lines from the NUMA-onlined region. */
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for (offset = 0; offset < size; offset += cbsize)
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{
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asm volatile("dcbf %0,%1" :: "r" (cpu_virtual), "r" (offset) : "memory");
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/* Reschedule if necessary to avoid lockup warnings */
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cond_resched();
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}
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CACHE_FLUSH();
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}
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#else
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void nv_init_ibmnpu_info(nv_state_t *nv)
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{
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}
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void nv_destroy_ibmnpu_info(nv_state_t *nv)
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{
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}
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int nv_init_ibmnpu_devices(nv_state_t *nv)
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{
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return 0;
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}
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void nv_unregister_ibmnpu_devices(nv_state_t *nv)
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{
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}
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NV_STATUS NV_API_CALL nv_get_ibmnpu_genreg_info(nv_state_t *nv, NvU64 *addr,
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NvU64 *size, void **device)
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{
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return NV_ERR_NOT_SUPPORTED;
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}
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NV_STATUS NV_API_CALL nv_get_ibmnpu_relaxed_ordering_mode(nv_state_t *nv,
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NvBool *mode)
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{
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return NV_ERR_NOT_SUPPORTED;
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}
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void NV_API_CALL nv_wait_for_ibmnpu_rsync(nv_state_t *nv)
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{
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}
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int nv_get_ibmnpu_chip_id(nv_state_t *nv)
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{
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return -1;
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}
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void NV_API_CALL nv_ibmnpu_cache_flush_range(nv_state_t *nv, NvU64 virtual, NvU64 size)
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{
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}
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void nv_ibmnpu_cache_flush_numa_region(nv_state_t *nv)
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{
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}
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#endif
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