diff options
Diffstat (limited to 'drivers/accel/habanalabs/common/mmu/mmu_v2.c')
| -rw-r--r-- | drivers/accel/habanalabs/common/mmu/mmu_v2.c | 338 |
1 files changed, 338 insertions, 0 deletions
diff --git a/drivers/accel/habanalabs/common/mmu/mmu_v2.c b/drivers/accel/habanalabs/common/mmu/mmu_v2.c new file mode 100644 index 0000000000..4bc0268fff --- /dev/null +++ b/drivers/accel/habanalabs/common/mmu/mmu_v2.c @@ -0,0 +1,338 @@ +// SPDX-License-Identifier: GPL-2.0 + +/* + * Copyright 2016-2020 HabanaLabs, Ltd. + * All Rights Reserved. + */ + +#include "../habanalabs.h" +#include "../../include/hw_ip/mmu/mmu_general.h" +#include "../../include/hw_ip/mmu/mmu_v2_0.h" + +#include <linux/slab.h> + +/** + * hl_mmu_v2_ctx_init() - initialize a context for using the MMU module. + * @ctx: pointer to the context structure to initialize. + * + * Initialize a mutex to protect the concurrent mapping flow, a hash to hold all + * page tables hops related to this context. + * Return: 0 on success, non-zero otherwise. + */ +static int hl_mmu_v2_ctx_init(struct hl_ctx *ctx) +{ + hash_init(ctx->mmu_shadow_hash); + + return 0; +} + +/* + * hl_mmu_v2_ctx_fini - disable a ctx from using the mmu module + * + * @ctx: pointer to the context structure + * + * This function does the following: + * - Free any pgts which were not freed yet + * - Free the mutex + * - Free DRAM default page mapping hops + */ +static void hl_mmu_v2_ctx_fini(struct hl_ctx *ctx) +{ + struct hl_device *hdev = ctx->hdev; + struct pgt_info *pgt_info; + struct hlist_node *tmp; + int i; + + if (!hash_empty(ctx->mmu_shadow_hash)) + dev_err(hdev->dev, "ctx %d is freed while it has pgts in use\n", + ctx->asid); + + hash_for_each_safe(ctx->mmu_shadow_hash, i, tmp, pgt_info, node) { + dev_err_ratelimited(hdev->dev, + "pgt_info of addr 0x%llx of asid %d was not destroyed, num_ptes: %d\n", + pgt_info->phys_addr, ctx->asid, pgt_info->num_of_ptes); + hl_mmu_dr_free_pgt_node(ctx, pgt_info); + } +} + +static int hl_mmu_v2_unmap(struct hl_ctx *ctx, u64 virt_addr, bool is_dram_addr) +{ + u64 hop_addr[MMU_ARCH_6_HOPS] = { 0 }, hop_pte_addr[MMU_ARCH_6_HOPS] = { 0 }, curr_pte, + scrambled_virt_addr; + struct asic_fixed_properties *prop = &ctx->hdev->asic_prop; + struct hl_device *hdev = ctx->hdev; + struct hl_mmu_properties *mmu_prop; + bool is_huge = false; + int i, hop_last; + + /* device resident in V2 are allowed only for HMMU */ + if (!is_dram_addr) + return -EINVAL; + + mmu_prop = &prop->dmmu; + + hop_last = mmu_prop->num_hops - 1; + + scrambled_virt_addr = hdev->asic_funcs->scramble_addr(hdev, virt_addr); + + hop_addr[0] = hl_mmu_dr_get_hop0_addr(ctx); + hop_pte_addr[0] = hl_mmu_get_hop_pte_phys_addr(ctx, mmu_prop, 0, + hop_addr[0], scrambled_virt_addr); + if (hop_pte_addr[0] == U64_MAX) + return -EFAULT; + + curr_pte = *(u64 *) (uintptr_t) hop_pte_addr[0]; + + for (i = 1 ; i < mmu_prop->num_hops ; i++) { + hop_addr[i] = hl_mmu_get_next_hop_addr(ctx, curr_pte); + if (hop_addr[i] == ULLONG_MAX) + goto not_mapped; + + hop_pte_addr[i] = hl_mmu_get_hop_pte_phys_addr(ctx, mmu_prop, i, + hop_addr[i], scrambled_virt_addr); + if (hop_pte_addr[i] == U64_MAX) + return -EFAULT; + + curr_pte = *(u64 *) (uintptr_t) hop_pte_addr[i]; + + if ((i <= hop_last) && (curr_pte & mmu_prop->last_mask)) { + hop_last = i; + is_huge = true; + break; + } + } + + if (is_dram_addr && !is_huge) { + dev_err(hdev->dev, "DRAM unmapping should use huge pages only\n"); + return -EFAULT; + } + + if (!(curr_pte & PAGE_PRESENT_MASK)) + goto not_mapped; + + for (i = hop_last ; i > 0 ; i--) { + hl_mmu_dr_clear_pte(ctx, hop_pte_addr[i]); + if (hl_mmu_dr_put_pte(ctx, hop_addr[i])) + goto mapped; + } + hl_mmu_dr_clear_pte(ctx, hop_pte_addr[0]); + +mapped: + return 0; + +not_mapped: + dev_err(hdev->dev, "virt addr 0x%llx is not mapped to phys addr\n", + virt_addr); + + return -EINVAL; +} + +static int hl_mmu_v2_map(struct hl_ctx *ctx, u64 virt_addr, u64 phys_addr, + u32 page_size, bool is_dram_addr) +{ + u64 hop_addr[MMU_ARCH_6_HOPS] = { 0 }, hop_pte_addr[MMU_ARCH_6_HOPS] = { 0 }, + curr_pte = 0, scrambled_virt_addr, scrambled_phys_addr; + struct asic_fixed_properties *prop = &ctx->hdev->asic_prop; + bool hop_new[MMU_ARCH_6_HOPS] = { false }; + struct hl_device *hdev = ctx->hdev; + struct hl_mmu_properties *mmu_prop; + int rc, i, hop_last; + + /* device resident in V2 are allowed only for HMMU */ + if (!is_dram_addr) + return -EINVAL; + + mmu_prop = &prop->dmmu; + + hop_last = mmu_prop->num_hops - 1; + + scrambled_virt_addr = hdev->asic_funcs->scramble_addr(hdev, virt_addr); + scrambled_phys_addr = hdev->asic_funcs->scramble_addr(hdev, phys_addr); + + /* First hop is preallocated therefore it is treated differently */ + hop_addr[0] = hl_mmu_dr_get_hop0_addr(ctx); + hop_pte_addr[0] = hl_mmu_get_hop_pte_phys_addr(ctx, mmu_prop, 0, + hop_addr[0], scrambled_virt_addr); + curr_pte = *(u64 *) (uintptr_t) hop_pte_addr[0]; + + /* Handle hop1 to hop_last */ + for (i = 1 ; i <= hop_last ; i++) { + hop_addr[i] = hl_mmu_dr_get_alloc_next_hop_addr(ctx, curr_pte, &hop_new[i]); + if (hop_addr[i] == ULLONG_MAX) { + rc = -ENOMEM; + goto err; + } + + hop_pte_addr[i] = hl_mmu_get_hop_pte_phys_addr(ctx, mmu_prop, i, + hop_addr[i], scrambled_virt_addr); + if (hop_pte_addr[i] == U64_MAX) { + rc = -EINVAL; + goto err; + } + + if (!hop_pte_addr[i]) { + rc = -EINVAL; + goto err; + } + + curr_pte = *(u64 *) (uintptr_t) hop_pte_addr[i]; + } + + if (curr_pte & PAGE_PRESENT_MASK) { + dev_err(hdev->dev, + "mapping already exists for virt_addr 0x%llx\n", + virt_addr); + + for (i = 0 ; i <= hop_last ; i++) + dev_dbg(hdev->dev, "hop%d pte: 0x%llx (0x%llx)\n", + i, *(u64 *) (uintptr_t) hop_pte_addr[i], + hop_pte_addr[i]); + + rc = -EINVAL; + goto err; + } + + curr_pte = (scrambled_phys_addr & HOP_PHYS_ADDR_MASK) + | mmu_prop->last_mask | PAGE_PRESENT_MASK; + + /* Write the PTEs */ + hl_mmu_dr_write_final_pte(ctx, hop_pte_addr[hop_last], curr_pte); + + /* for each new hop, add its address to the table of previous-hop */ + for (i = 1 ; i <= hop_last ; i++) { + if (hop_new[i]) { + curr_pte = (hop_addr[i] & HOP_PHYS_ADDR_MASK) | PAGE_PRESENT_MASK; + hl_mmu_dr_write_pte(ctx, hop_pte_addr[i - 1], curr_pte); + + if (i - 1) + hl_mmu_dr_get_pte(ctx, hop_addr[i - 1]); + } + } + hl_mmu_dr_get_pte(ctx, hop_addr[hop_last]); + + return 0; + +err: + for (i = 1 ; i <= hop_last ; i++) + if (hop_new[i] && (hop_addr[i] != U64_MAX)) + hl_mmu_dr_free_hop(ctx, hop_addr[i]); + + return rc; +} + +/* + * hl_mmu_v2_swap_out - marks all mapping of the given ctx as swapped out + * + * @ctx: pointer to the context structure + * + */ +static void hl_mmu_v2_swap_out(struct hl_ctx *ctx) +{ + +} + +/* + * hl_mmu_v2_swap_in - marks all mapping of the given ctx as swapped in + * + * @ctx: pointer to the context structure + * + */ +static void hl_mmu_v2_swap_in(struct hl_ctx *ctx) +{ + +} + +static int hl_mmu_v2_get_tlb_info(struct hl_ctx *ctx, u64 virt_addr, struct hl_mmu_hop_info *hops) +{ + struct asic_fixed_properties *prop = &ctx->hdev->asic_prop; + struct hl_device *hdev = ctx->hdev; + struct hl_mmu_properties *mmu_prop; + bool is_dram_addr; + int i; + + is_dram_addr = hl_mem_area_inside_range(virt_addr, prop->dmmu.page_size, + prop->dmmu.start_addr, + prop->dmmu.end_addr); + + /* device resident in V2 are allowed only for HMMU */ + if (!is_dram_addr) + return -EINVAL; + + mmu_prop = &prop->dmmu; + hops->range_type = HL_VA_RANGE_TYPE_DRAM; + + hops->scrambled_vaddr = hdev->asic_funcs->scramble_addr(hdev, virt_addr); + + hops->hop_info[0].hop_addr = hl_mmu_dr_get_phys_hop0_addr(ctx); + hops->hop_info[0].hop_pte_addr = hl_mmu_get_hop_pte_phys_addr(ctx, mmu_prop, 0, + hops->hop_info[0].hop_addr, + hops->scrambled_vaddr); + if (hops->hop_info[0].hop_pte_addr == U64_MAX) + return -EFAULT; + + hops->hop_info[0].hop_pte_val = hdev->asic_funcs->read_pte(hdev, + hops->hop_info[0].hop_pte_addr); + if (hops->hop_info[0].hop_pte_val == U64_MAX) + return -EFAULT; + + for (i = 1 ; i < mmu_prop->num_hops ; i++) { + hops->hop_info[i].hop_addr = + hl_mmu_get_next_hop_addr(ctx, hops->hop_info[i - 1].hop_pte_val); + if (hops->hop_info[i].hop_addr == ULLONG_MAX) + return -EFAULT; + + hops->hop_info[i].hop_pte_addr = + hl_mmu_get_hop_pte_phys_addr(ctx, mmu_prop, i, + hops->hop_info[i].hop_addr, + hops->scrambled_vaddr); + if (hops->hop_info[i].hop_pte_addr == U64_MAX) + return -EFAULT; + + hops->hop_info[i].hop_pte_val = + hdev->asic_funcs->read_pte(hdev, + hops->hop_info[i].hop_pte_addr); + + if (!(hops->hop_info[i].hop_pte_val & PAGE_PRESENT_MASK)) + return -EFAULT; + + if (hops->hop_info[i].hop_pte_val & mmu_prop->last_mask) + break; + } + + /* if passed over all hops then no last hop was found */ + if (i == mmu_prop->num_hops) + return -EFAULT; + + if (!(hops->hop_info[i].hop_pte_val & PAGE_PRESENT_MASK)) + return -EFAULT; + + if (hops->scrambled_vaddr != virt_addr) + hops->unscrambled_paddr = hdev->asic_funcs->descramble_addr + (hdev, hops->hop_info[i].hop_pte_val); + else + hops->unscrambled_paddr = hops->hop_info[i].hop_pte_val; + + hops->used_hops = i + 1; + + return 0; +} + +/* + * hl_mmu_v2_prepare - prepare mmu_if for working with mmu v2 + * + * @hdev: pointer to the device structure + * @mmu_if: pointer to the mmu interface structure + */ +void hl_mmu_v2_set_funcs(struct hl_device *hdev, struct hl_mmu_funcs *mmu) +{ + mmu->init = hl_mmu_dr_init; + mmu->fini = hl_mmu_dr_fini; + mmu->ctx_init = hl_mmu_v2_ctx_init; + mmu->ctx_fini = hl_mmu_v2_ctx_fini; + mmu->map = hl_mmu_v2_map; + mmu->unmap = hl_mmu_v2_unmap; + mmu->flush = hl_mmu_dr_flush; + mmu->swap_out = hl_mmu_v2_swap_out; + mmu->swap_in = hl_mmu_v2_swap_in; + mmu->get_tlb_info = hl_mmu_v2_get_tlb_info; +} |