--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * AMD Address Translation Library
+ *
+ * core.c : Module init and base translation functions
+ *
+ * Copyright (c) 2023, Advanced Micro Devices, Inc.
+ * All Rights Reserved.
+ *
+ * Author: Yazen Ghannam <Yazen.Ghannam@amd.com>
+ */
+
+#include <linux/module.h>
+#include <asm/cpu_device_id.h>
+
+#include "internal.h"
+
+struct df_config df_cfg __read_mostly;
+
+static int addr_over_limit(struct addr_ctx *ctx)
+{
+ u64 dram_limit_addr;
+
+ if (df_cfg.rev >= DF4)
+ dram_limit_addr = FIELD_GET(DF4_DRAM_LIMIT_ADDR, ctx->map.limit);
+ else
+ dram_limit_addr = FIELD_GET(DF2_DRAM_LIMIT_ADDR, ctx->map.limit);
+
+ dram_limit_addr <<= DF_DRAM_BASE_LIMIT_LSB;
+ dram_limit_addr |= GENMASK(DF_DRAM_BASE_LIMIT_LSB - 1, 0);
+
+ /* Is calculated system address above DRAM limit address? */
+ if (ctx->ret_addr > dram_limit_addr) {
+ atl_debug(ctx, "Calculated address (0x%016llx) > DRAM limit (0x%016llx)",
+ ctx->ret_addr, dram_limit_addr);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static bool legacy_hole_en(struct addr_ctx *ctx)
+{
+ u32 reg = ctx->map.base;
+
+ if (df_cfg.rev >= DF4)
+ reg = ctx->map.ctl;
+
+ return FIELD_GET(DF_LEGACY_MMIO_HOLE_EN, reg);
+}
+
+static int add_legacy_hole(struct addr_ctx *ctx)
+{
+ u32 dram_hole_base;
+ u8 func = 0;
+
+ if (!legacy_hole_en(ctx))
+ return 0;
+
+ if (df_cfg.rev >= DF4)
+ func = 7;
+
+ if (df_indirect_read_broadcast(ctx->node_id, func, 0x104, &dram_hole_base))
+ return -EINVAL;
+
+ dram_hole_base &= DF_DRAM_HOLE_BASE_MASK;
+
+ if (ctx->ret_addr >= dram_hole_base)
+ ctx->ret_addr += (BIT_ULL(32) - dram_hole_base);
+
+ return 0;
+}
+
+static u64 get_base_addr(struct addr_ctx *ctx)
+{
+ u64 base_addr;
+
+ if (df_cfg.rev >= DF4)
+ base_addr = FIELD_GET(DF4_BASE_ADDR, ctx->map.base);
+ else
+ base_addr = FIELD_GET(DF2_BASE_ADDR, ctx->map.base);
+
+ return base_addr << DF_DRAM_BASE_LIMIT_LSB;
+}
+
+static int add_base_and_hole(struct addr_ctx *ctx)
+{
+ ctx->ret_addr += get_base_addr(ctx);
+
+ if (add_legacy_hole(ctx))
+ return -EINVAL;
+
+ return 0;
+}
+
+static bool late_hole_remove(struct addr_ctx *ctx)
+{
+ if (df_cfg.rev == DF3p5)
+ return true;
+
+ if (df_cfg.rev == DF4)
+ return true;
+
+ if (ctx->map.intlv_mode == DF3_6CHAN)
+ return true;
+
+ return false;
+}
+
+unsigned long norm_to_sys_addr(u8 socket_id, u8 die_id, u8 coh_st_inst_id, unsigned long addr)
+{
+ struct addr_ctx ctx;
+
+ if (df_cfg.rev == UNKNOWN)
+ return -EINVAL;
+
+ memset(&ctx, 0, sizeof(ctx));
+
+ /* Start from the normalized address */
+ ctx.ret_addr = addr;
+ ctx.inst_id = coh_st_inst_id;
+
+ ctx.inputs.norm_addr = addr;
+ ctx.inputs.socket_id = socket_id;
+ ctx.inputs.die_id = die_id;
+ ctx.inputs.coh_st_inst_id = coh_st_inst_id;
+
+ if (determine_node_id(&ctx, socket_id, die_id))
+ return -EINVAL;
+
+ if (get_address_map(&ctx))
+ return -EINVAL;
+
+ if (denormalize_address(&ctx))
+ return -EINVAL;
+
+ if (!late_hole_remove(&ctx) && add_base_and_hole(&ctx))
+ return -EINVAL;
+
+ if (dehash_address(&ctx))
+ return -EINVAL;
+
+ if (late_hole_remove(&ctx) && add_base_and_hole(&ctx))
+ return -EINVAL;
+
+ if (addr_over_limit(&ctx))
+ return -EINVAL;
+
+ return ctx.ret_addr;
+}
+
+static void check_for_legacy_df_access(void)
+{
+ /*
+ * All Zen-based systems before Family 19h use the legacy
+ * DF Indirect Access (FICAA/FICAD) offsets.
+ */
+ if (boot_cpu_data.x86 < 0x19) {
+ df_cfg.flags.legacy_ficaa = true;
+ return;
+ }
+
+ /* All systems after Family 19h use the current offsets. */
+ if (boot_cpu_data.x86 > 0x19)
+ return;
+
+ /* Some Family 19h systems use the legacy offsets. */
+ switch (boot_cpu_data.x86_model) {
+ case 0x00 ... 0x0f:
+ case 0x20 ... 0x5f:
+ df_cfg.flags.legacy_ficaa = true;
+ }
+}
+
+/*
+ * This library provides functionality for AMD-based systems with a Data Fabric.
+ * The set of systems with a Data Fabric is equivalent to the set of Zen-based systems
+ * and the set of systems with the Scalable MCA feature at this time. However, these
+ * are technically independent things.
+ *
+ * It's possible to match on the PCI IDs of the Data Fabric devices, but this will be
+ * an ever expanding list. Instead, match on the SMCA and Zen features to cover all
+ * relevant systems.
+ */
+static const struct x86_cpu_id amd_atl_cpuids[] = {
+ X86_MATCH_FEATURE(X86_FEATURE_SMCA, NULL),
+ X86_MATCH_FEATURE(X86_FEATURE_ZEN, NULL),
+ { }
+};
+MODULE_DEVICE_TABLE(x86cpu, amd_atl_cpuids);
+
+static int __init amd_atl_init(void)
+{
+ if (!x86_match_cpu(amd_atl_cpuids))
+ return -ENODEV;
+
+ if (!amd_nb_num())
+ return -ENODEV;
+
+ check_for_legacy_df_access();
+
+ if (get_df_system_info())
+ return -ENODEV;
+
+ /* Increment this module's recount so that it can't be easily unloaded. */
+ __module_get(THIS_MODULE);
+ amd_atl_register_decoder(convert_umc_mca_addr_to_sys_addr);
+
+ pr_info("AMD Address Translation Library initialized");
+ return 0;
+}
+
+/*
+ * Exit function is only needed for testing and debug. Module unload must be
+ * forced to override refcount check.
+ */
+static void __exit amd_atl_exit(void)
+{
+ amd_atl_unregister_decoder();
+}
+
+module_init(amd_atl_init);
+module_exit(amd_atl_exit);
+
+MODULE_LICENSE("GPL");
projects / linux-2.6-block.git / blobdiff