From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:15098 "EHLO mx0b-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726479AbgKQPnC (ORCPT ); Tue, 17 Nov 2020 10:43:02 -0500 From: Janosch Frank Subject: [kvm-unit-tests PATCH 3/5] s390x: SCLP feature checking Date: Tue, 17 Nov 2020 10:42:13 -0500 Message-Id: <20201117154215.45855-4-frankja@linux.ibm.com> In-Reply-To: <20201117154215.45855-1-frankja@linux.ibm.com> References: <20201117154215.45855-1-frankja@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit List-ID: To: kvm@vger.kernel.org Cc: thuth@redhat.com, linux-s390@vger.kernel.org, david@redhat.com, borntraeger@de.ibm.com, imbrenda@linux.ibm.com Availability of SIE is announced via a feature bit in a SCLP info CPU entry. Let's add a framework that allows us to easily check for such facilities. Signed-off-by: Janosch Frank --- lib/s390x/io.c | 1 + lib/s390x/sclp.c | 19 +++++++++++++++++++ lib/s390x/sclp.h | 15 +++++++++++++++ 3 files changed, 35 insertions(+) diff --git a/lib/s390x/io.c b/lib/s390x/io.c index e19a1f3..e843601 100644 --- a/lib/s390x/io.c +++ b/lib/s390x/io.c @@ -37,6 +37,7 @@ void setup(void) setup_args_progname(ipl_args); setup_facilities(); sclp_read_info(); + sclp_facilities_setup(); sclp_console_setup(); sclp_memory_setup(); smp_setup(); diff --git a/lib/s390x/sclp.c b/lib/s390x/sclp.c index ea6324e..599e022 100644 --- a/lib/s390x/sclp.c +++ b/lib/s390x/sclp.c @@ -11,6 +11,7 @@ */ #include +#include #include #include #include @@ -27,6 +28,7 @@ static uint64_t max_ram_size; static uint64_t ram_size; char _read_info[PAGE_SIZE] __attribute__((__aligned__(4096))); static ReadInfo *read_info; +struct sclp_facilities sclp_facilities; char _sccb[PAGE_SIZE] __attribute__((__aligned__(4096))); static volatile bool sclp_busy; @@ -128,6 +130,23 @@ CPUEntry *sclp_get_cpu_entries(void) return (void *)read_info + read_info->offset_cpu; } +void sclp_facilities_setup(void) +{ + unsigned short cpu0_addr = stap(); + CPUEntry *cpu; + int i; + + assert(read_info); + + cpu = (void *)read_info + read_info->offset_cpu; + for (i = 0; i < read_info->entries_cpu; i++, cpu++) { + if (cpu->address == cpu0_addr) { + sclp_facilities.has_sief2 = test_bit_inv(SCLP_CPU_FEATURE_SIEF2_BIT, (void *)&cpu->address); + break; + } + } +} + /* Perform service call. Return 0 on success, non-zero otherwise. */ int sclp_service_call(unsigned int command, void *sccb) { diff --git a/lib/s390x/sclp.h b/lib/s390x/sclp.h index 6620531..bcc9f4b 100644 --- a/lib/s390x/sclp.h +++ b/lib/s390x/sclp.h @@ -101,6 +101,20 @@ typedef struct CPUEntry { uint8_t reserved1; } __attribute__((packed)) CPUEntry; +extern struct sclp_facilities sclp_facilities; + +struct sclp_facilities { + u64 has_sief2 : 1; +}; + +/* + * test_bit() uses unsigned long ptrs so we give it the ptr to the + * address member and offset bits by 16. + */ +enum sclp_cpu_feature_bit { + SCLP_CPU_FEATURE_SIEF2_BIT = 16 + 4, +}; + typedef struct ReadInfo { SCCBHeader h; uint16_t rnmax; @@ -274,6 +288,7 @@ void sclp_print(const char *str); void sclp_read_info(void); int sclp_get_cpu_num(void); CPUEntry *sclp_get_cpu_entries(void); +void sclp_facilities_setup(void); int sclp_service_call(unsigned int command, void *sccb); void sclp_memory_setup(void); uint64_t get_ram_size(void); -- 2.25.1