From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:33072 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1729121AbgFHINO (ORCPT ); Mon, 8 Jun 2020 04:13:14 -0400 From: Pierre Morel Subject: [kvm-unit-tests PATCH v8 12/12] s390x: css: ssch/tsch with sense and interrupt Date: Mon, 8 Jun 2020 10:13:01 +0200 Message-Id: <1591603981-16879-13-git-send-email-pmorel@linux.ibm.com> In-Reply-To: <1591603981-16879-1-git-send-email-pmorel@linux.ibm.com> References: <1591603981-16879-1-git-send-email-pmorel@linux.ibm.com> Sender: linux-s390-owner@vger.kernel.org List-ID: To: kvm@vger.kernel.org Cc: linux-s390@vger.kernel.org, frankja@linux.ibm.com, david@redhat.com, thuth@redhat.com, cohuck@redhat.com After a channel is enabled we start a SENSE_ID command using the SSCH instruction to recognize the control unit and device. This tests the success of SSCH, the I/O interruption and the TSCH instructions. The SENSE_ID command response is tested to report 0xff inside its reserved field and to report the same control unit type as the cu_type kernel argument. Without the cu_type kernel argument, the test expects a device with a default control unit type of 0x3832, a.k.a virtio-net-ccw. Signed-off-by: Pierre Morel --- lib/s390x/css.h | 20 ++++++ lib/s390x/css_lib.c | 46 ++++++++++++++ s390x/css.c | 149 +++++++++++++++++++++++++++++++++++++++++++- 3 files changed, 214 insertions(+), 1 deletion(-) diff --git a/lib/s390x/css.h b/lib/s390x/css.h index 33caaa0..2a01f05 100644 --- a/lib/s390x/css.h +++ b/lib/s390x/css.h @@ -101,6 +101,19 @@ struct irb { uint32_t emw[8]; } __attribute__ ((aligned(4))); +#define CCW_CMD_SENSE_ID 0xe4 +#define CSS_SENSEID_COMMON_LEN 8 +struct senseid { + /* common part */ + uint8_t reserved; /* always 0x'FF' */ + uint16_t cu_type; /* control unit type */ + uint8_t cu_model; /* control unit model */ + uint16_t dev_type; /* device type */ + uint8_t dev_model; /* device model */ + uint8_t unused; /* padding byte */ + uint8_t padding[256 - 10]; /* Extra padding for CCW */ +} __attribute__ ((aligned(4))) __attribute__ ((packed)); + /* CSS low level access functions */ static inline int ssch(unsigned long schid, struct orb *addr) @@ -254,4 +267,11 @@ int css_enumerate(void); #define MAX_ENABLE_RETRIES 5 int css_enable(int schid); + +/* Library functions */ +int start_ccw1_chain(unsigned int sid, struct ccw1 *ccw); +int start_subchannel(unsigned int sid, int code, void *data, int count, + unsigned char flags); +int sch_read_len(int sid); + #endif diff --git a/lib/s390x/css_lib.c b/lib/s390x/css_lib.c index 831a116..935af49 100644 --- a/lib/s390x/css_lib.c +++ b/lib/s390x/css_lib.c @@ -128,3 +128,49 @@ retry: schid, retry_count, pmcw->flags); return -1; } + +int start_ccw1_chain(unsigned int sid, struct ccw1 *ccw) +{ + struct orb orb = { + .intparm = sid, + .ctrl = ORB_CTRL_ISIC|ORB_CTRL_FMT|ORB_LPM_DFLT, + .cpa = (unsigned int) (unsigned long)ccw, + }; + + return ssch(sid, &orb); +} + +/* + * In the next revisions we will implement the possibility to handle + * CCW chains doing this we will need to work with ccw1 pointers. + * For now we only need a unique CCW. + */ +static struct ccw1 unique_ccw; + +int start_subchannel(unsigned int sid, int code, void *data, int count, + unsigned char flags) +{ + int cc; + struct ccw1 *ccw = &unique_ccw; + + report_prefix_push("start_senseid"); + /* Build the CCW chain with a single CCW */ + ccw->code = code; + ccw->flags = flags; /* No flags need to be set */ + ccw->count = count; + ccw->data_address = (int)(unsigned long)data; + + cc = start_ccw1_chain(sid, ccw); + if (cc) { + report(0, "start_ccw_chain failed ret=%d", cc); + report_prefix_pop(); + return cc; + } + report_prefix_pop(); + return 0; +} + +int sch_read_len(int sid) +{ + return unique_ccw.count; +} diff --git a/s390x/css.c b/s390x/css.c index 6f58d4a..79c997d 100644 --- a/s390x/css.c +++ b/s390x/css.c @@ -16,10 +16,26 @@ #include #include #include +#include #include +#define DEFAULT_CU_TYPE 0x3832 +static unsigned long cu_type = DEFAULT_CU_TYPE; + +struct lowcore *lowcore = (void *)0x0; + static int test_device_sid; +static struct irb irb; +static struct senseid senseid; + +static void set_io_irq_subclass_mask(uint64_t const new_mask) +{ + asm volatile ( + "lctlg %%c6, %%c6, %[source]\n" + : /* No outputs */ + : [source] "R" (new_mask)); +} static void test_enumerate(void) { @@ -57,20 +73,151 @@ static void test_enable(void) report(1, "Subchannel %08x enabled", test_device_sid); } +static void enable_io_isc(void) +{ + /* Let's enable all ISCs for I/O interrupt */ + set_io_irq_subclass_mask(0x00000000ff000000); +} + +static void irq_io(void) +{ + int ret = 0; + char *flags; + int sid; + + report_prefix_push("Interrupt"); + /* Lowlevel set the SID as interrupt parameter. */ + if (lowcore->io_int_param != test_device_sid) { + report(0, + "Bad io_int_param: %x expected %x", + lowcore->io_int_param, test_device_sid); + goto pop; + } + report_prefix_pop(); + + report_prefix_push("tsch"); + sid = lowcore->subsys_id_word; + ret = tsch(sid, &irb); + switch (ret) { + case 1: + dump_irb(&irb); + flags = dump_scsw_flags(irb.scsw.ctrl); + report(0, + "I/O interrupt, CC 1 but tsch reporting sch %08x as not status pending: %s", + sid, flags); + break; + case 2: + report(0, "tsch returns unexpected CC 2"); + break; + case 3: + report(0, "tsch reporting sch %08x as not operational", sid); + break; + case 0: + /* Stay humble on success */ + break; + } +pop: + report_prefix_pop(); + lowcore->io_old_psw.mask &= ~PSW_MASK_WAIT; +} + +/* + * test_sense + * Pre-requisits: + * - We need the test device as the first recognized + * device by the enumeration. + */ +static void test_sense(void) +{ + int ret; + + if (!test_device_sid) { + report_skip("No device"); + return; + } + + ret = css_enable(test_device_sid); + if (ret) { + report(0, + "Could not enable the subchannel: %08x", + test_device_sid); + return; + } + + ret = register_io_int_func(irq_io); + if (ret) { + report(0, "Could not register IRQ handler"); + goto unreg_cb; + } + + lowcore->io_int_param = 0; + + memset(&senseid, 0, sizeof(senseid)); + ret = start_subchannel(test_device_sid, CCW_CMD_SENSE_ID, + &senseid, sizeof(senseid), CCW_F_SLI); + if (ret) { + report(0, "ssch failed for SENSE ID on sch %08x with cc %d", + test_device_sid, ret); + goto unreg_cb; + } + + wait_for_interrupt(PSW_MASK_IO); + + ret = sch_read_len(test_device_sid); + if (ret < CSS_SENSEID_COMMON_LEN) { + report(0, + "ssch succeeded for SENSE ID but report a too short length: %d", + ret); + goto unreg_cb; + } + + if (senseid.reserved != 0xff) { + report(0, + "ssch succeeded for SENSE ID but reports garbage: %x", + senseid.reserved); + goto unreg_cb; + } + + if (lowcore->io_int_param != test_device_sid) + goto unreg_cb; + + report_info("senseid length read: %d", ret); + report_info("reserved %02x cu_type %04x cu_model %02x dev_type %04x dev_model %02x", + senseid.reserved, senseid.cu_type, senseid.cu_model, + senseid.dev_type, senseid.dev_model); + + report((senseid.cu_type == cu_type), + "cu_type: expect 0x%04x got 0x%04x", + (uint16_t) cu_type, senseid.cu_type); + +unreg_cb: + unregister_io_int_func(irq_io); +} + static struct { const char *name; void (*func)(void); } tests[] = { { "enumerate (stsch)", test_enumerate }, { "enable (msch)", test_enable }, + { "sense (ssch/tsch)", test_sense }, { NULL, NULL } }; +static unsigned long value; + int main(int argc, char *argv[]) { - int i; + int i, ret; + + ret = kernel_arg(argc, argv, "cu_type=", &value); + if (!ret) + cu_type = (uint16_t)value; + else + report_info("Using cu_type default value: 0x%04lx", cu_type); report_prefix_push("Channel Subsystem"); + enable_io_isc(); for (i = 0; tests[i].name; i++) { report_prefix_push(tests[i].name); tests[i].func(); -- 2.25.1