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Peter Anvin" Cc: zhiquan1.li@intel.com, Kristen Carlson Accardi , Sean Christopherson Subject: [PATCH 03/26] x86/sgx: Add 'struct sgx_epc_lru' to encapsulate lru list(s) Date: Fri, 11 Nov 2022 10:35:08 -0800 Message-Id: <20221111183532.3676646-4-kristen@linux.intel.com> X-Mailer: git-send-email 2.37.3 In-Reply-To: <20221111183532.3676646-1-kristen@linux.intel.com> References: <20221111183532.3676646-1-kristen@linux.intel.com> MIME-Version: 1.0 X-Spam-Status: No, score=-4.3 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_EF,RCVD_IN_DNSWL_MED,SPF_HELO_NONE, SPF_NONE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1749225894917060549?= X-GMAIL-MSGID: =?utf-8?q?1749225894917060549?= Introduce a data structure to wrap the existing reclaimable list and its spinlock in a struct to minimize the code changes needed to handle multiple LRUs as well as reclaimable and non-reclaimable lists, both of which will be introduced and used by SGX EPC cgroups. Signed-off-by: Sean Christopherson Signed-off-by: Kristen Carlson Accardi Cc: Sean Christopherson --- arch/x86/kernel/cpu/sgx/sgx.h | 45 +++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) diff --git a/arch/x86/kernel/cpu/sgx/sgx.h b/arch/x86/kernel/cpu/sgx/sgx.h index efb10eacd3aa..aac7d4feb0fa 100644 --- a/arch/x86/kernel/cpu/sgx/sgx.h +++ b/arch/x86/kernel/cpu/sgx/sgx.h @@ -91,6 +91,51 @@ static inline void *sgx_get_epc_virt_addr(struct sgx_epc_page *page) return section->virt_addr + index * PAGE_SIZE; } +struct sgx_epc_lru { + spinlock_t lock; + struct list_head reclaimable; + struct list_head unreclaimable; +}; + +static inline void sgx_lru_init(struct sgx_epc_lru *lru) +{ + spin_lock_init(&lru->lock); + INIT_LIST_HEAD(&lru->reclaimable); + INIT_LIST_HEAD(&lru->unreclaimable); +} + +/* + * Must be called with queue lock acquired + */ +static inline void __sgx_epc_page_list_push(struct list_head *list, struct sgx_epc_page *page) +{ + list_add_tail(&page->list, list); +} + +/* + * Must be called with queue lock acquired + */ +static inline struct sgx_epc_page * __sgx_epc_page_list_pop(struct list_head *list) +{ + struct sgx_epc_page *epc_page; + + if (list_empty(list)) + return NULL; + + epc_page = list_first_entry(list, struct sgx_epc_page, list); + list_del_init(&epc_page->list); + return epc_page; +} + +#define sgx_epc_pop_reclaimable(lru) \ + __sgx_epc_page_list_pop(&(lru)->reclaimable) +#define sgx_epc_push_reclaimable(lru, page) \ + __sgx_epc_page_list_push(&(lru)->reclaimable, page) +#define sgx_epc_pop_unreclaimable(lru) \ + __sgx_epc_page_list_pop(&(lru)->unreclaimable) +#define sgx_epc_push_unreclaimable(lru, page) \ + __sgx_epc_page_list_push(&(lru)->unreclaimable, page) + struct sgx_epc_page *__sgx_alloc_epc_page(void); void sgx_free_epc_page(struct sgx_epc_page *page);