1e7e05452SSean Christopherson /* SPDX-License-Identifier: GPL-2.0 */ 2e7e05452SSean Christopherson #ifndef _X86_SGX_H 3e7e05452SSean Christopherson #define _X86_SGX_H 4e7e05452SSean Christopherson 5e7e05452SSean Christopherson #include <linux/bitops.h> 6e7e05452SSean Christopherson #include <linux/err.h> 7e7e05452SSean Christopherson #include <linux/io.h> 8e7e05452SSean Christopherson #include <linux/rwsem.h> 9e7e05452SSean Christopherson #include <linux/types.h> 10e7e05452SSean Christopherson #include <asm/asm.h> 11e7e05452SSean Christopherson #include "arch.h" 12e7e05452SSean Christopherson 13e7e05452SSean Christopherson #undef pr_fmt 14e7e05452SSean Christopherson #define pr_fmt(fmt) "sgx: " fmt 15e7e05452SSean Christopherson 16e7e05452SSean Christopherson #define SGX_MAX_EPC_SECTIONS 8 17c6d26d37SJarkko Sakkinen #define SGX_EEXTEND_BLOCK_SIZE 256 181728ab54SJarkko Sakkinen #define SGX_NR_TO_SCAN 16 191728ab54SJarkko Sakkinen #define SGX_NR_LOW_PAGES 32 201728ab54SJarkko Sakkinen #define SGX_NR_HIGH_PAGES 64 211728ab54SJarkko Sakkinen 221728ab54SJarkko Sakkinen /* Pages, which are being tracked by the page reclaimer. */ 231728ab54SJarkko Sakkinen #define SGX_EPC_PAGE_RECLAIMER_TRACKED BIT(0) 24e7e05452SSean Christopherson 25e7e05452SSean Christopherson struct sgx_epc_page { 26e7e05452SSean Christopherson unsigned int section; 271728ab54SJarkko Sakkinen unsigned int flags; 281728ab54SJarkko Sakkinen struct sgx_encl_page *owner; 29e7e05452SSean Christopherson struct list_head list; 30e7e05452SSean Christopherson }; 31e7e05452SSean Christopherson 32e7e05452SSean Christopherson /* 33*901ddbb9SJarkko Sakkinen * Contains the tracking data for NUMA nodes having EPC pages. Most importantly, 34*901ddbb9SJarkko Sakkinen * the free page list local to the node is stored here. 35*901ddbb9SJarkko Sakkinen */ 36*901ddbb9SJarkko Sakkinen struct sgx_numa_node { 37*901ddbb9SJarkko Sakkinen struct list_head free_page_list; 38*901ddbb9SJarkko Sakkinen spinlock_t lock; 39*901ddbb9SJarkko Sakkinen }; 40*901ddbb9SJarkko Sakkinen 41*901ddbb9SJarkko Sakkinen /* 42e7e05452SSean Christopherson * The firmware can define multiple chunks of EPC to the different areas of the 43e7e05452SSean Christopherson * physical memory e.g. for memory areas of the each node. This structure is 44e7e05452SSean Christopherson * used to store EPC pages for one EPC section and virtual memory area where 45e7e05452SSean Christopherson * the pages have been mapped. 46e7e05452SSean Christopherson */ 47e7e05452SSean Christopherson struct sgx_epc_section { 48e7e05452SSean Christopherson unsigned long phys_addr; 49e7e05452SSean Christopherson void *virt_addr; 50e7e05452SSean Christopherson struct sgx_epc_page *pages; 51*901ddbb9SJarkko Sakkinen struct sgx_numa_node *node; 52e7e05452SSean Christopherson }; 53e7e05452SSean Christopherson 54e7e05452SSean Christopherson extern struct sgx_epc_section sgx_epc_sections[SGX_MAX_EPC_SECTIONS]; 55e7e05452SSean Christopherson 56e7e05452SSean Christopherson static inline unsigned long sgx_get_epc_phys_addr(struct sgx_epc_page *page) 57e7e05452SSean Christopherson { 58e7e05452SSean Christopherson struct sgx_epc_section *section = &sgx_epc_sections[page->section]; 59e7e05452SSean Christopherson unsigned long index; 60e7e05452SSean Christopherson 61e7e05452SSean Christopherson index = ((unsigned long)page - (unsigned long)section->pages) / sizeof(*page); 62e7e05452SSean Christopherson 63e7e05452SSean Christopherson return section->phys_addr + index * PAGE_SIZE; 64e7e05452SSean Christopherson } 65e7e05452SSean Christopherson 66e7e05452SSean Christopherson static inline void *sgx_get_epc_virt_addr(struct sgx_epc_page *page) 67e7e05452SSean Christopherson { 68e7e05452SSean Christopherson struct sgx_epc_section *section = &sgx_epc_sections[page->section]; 69e7e05452SSean Christopherson unsigned long index; 70e7e05452SSean Christopherson 71e7e05452SSean Christopherson index = ((unsigned long)page - (unsigned long)section->pages) / sizeof(*page); 72e7e05452SSean Christopherson 73e7e05452SSean Christopherson return section->virt_addr + index * PAGE_SIZE; 74e7e05452SSean Christopherson } 75e7e05452SSean Christopherson 76d2285493SJarkko Sakkinen struct sgx_epc_page *__sgx_alloc_epc_page(void); 77d2285493SJarkko Sakkinen void sgx_free_epc_page(struct sgx_epc_page *page); 78d2285493SJarkko Sakkinen 791728ab54SJarkko Sakkinen void sgx_mark_page_reclaimable(struct sgx_epc_page *page); 801728ab54SJarkko Sakkinen int sgx_unmark_page_reclaimable(struct sgx_epc_page *page); 811728ab54SJarkko Sakkinen struct sgx_epc_page *sgx_alloc_epc_page(void *owner, bool reclaim); 821728ab54SJarkko Sakkinen 83e7e05452SSean Christopherson #endif /* _X86_SGX_H */ 84