Merging upstream version 6.9.7.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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;
+}