Re: [Qemu-devel] [RFC PATCH v3] tests: rtl8139: test timers and interrupt

[Paolo Bonzini <pbonzini@redhat.com>]

On 08/01/2015 19:38, Frediano Ziglio wrote:
> Test behaviour of timers and interrupts related to timeouts.
> 
> Signed-off-by: Frediano Ziglio <freddy77@gmail.com>
> ---
>  tests/Makefile       |   2 +-
>  tests/rtl8139-test.c | 181 +++++++++++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 182 insertions(+), 1 deletion(-)
> 
> This patch was derived from a test I did while implementing timer in
> rtl8139 code. Now that there is support for integrated testing I converted
> it. The test was tested on a real NIC.
> 
> As if it's the first test I wrote I don't know if syntax and details are
> fine. For instance should I remove nop test? Should I split my test?

Respectively, no and if you want.

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>

As the last person who touched the rtl8139 timer code, I'm glad I didn't
break anything. :)

Paolo

> 
> Changed from v2:
> - style (variable declaration, Perl script not able to spot it)
> 
> Changed from v1:
> - style
> 
> diff --git a/tests/Makefile b/tests/Makefile
> index e4ddb6a..8858407 100644
> --- a/tests/Makefile
> +++ b/tests/Makefile
> @@ -320,7 +320,7 @@ tests/tmp105-test$(EXESUF): tests/tmp105-test.o $(libqos-omap-obj-y)
>  tests/i440fx-test$(EXESUF): tests/i440fx-test.o $(libqos-pc-obj-y)
>  tests/fw_cfg-test$(EXESUF): tests/fw_cfg-test.o $(libqos-pc-obj-y)
>  tests/e1000-test$(EXESUF): tests/e1000-test.o
> -tests/rtl8139-test$(EXESUF): tests/rtl8139-test.o
> +tests/rtl8139-test$(EXESUF): tests/rtl8139-test.o $(libqos-pc-obj-y)
>  tests/pcnet-test$(EXESUF): tests/pcnet-test.o
>  tests/eepro100-test$(EXESUF): tests/eepro100-test.o
>  tests/vmxnet3-test$(EXESUF): tests/vmxnet3-test.o
> diff --git a/tests/rtl8139-test.c b/tests/rtl8139-test.c
> index f6a1be3..4e0bf02 100644
> --- a/tests/rtl8139-test.c
> +++ b/tests/rtl8139-test.c
> @@ -10,19 +10,200 @@
>  #include <glib.h>
>  #include <string.h>
>  #include "libqtest.h"
> +#include "libqos/pci-pc.h"
>  #include "qemu/osdep.h"
> +#include "qemu-common.h"
>  
>  /* Tests only initialization so far. TODO: Replace with functional tests */
>  static void nop(void)
>  {
>  }
>  
> +#define CLK 33000000
> +#define NS_PER_SEC 1000000000ULL
> +
> +static QPCIBus *pcibus;
> +static QPCIDevice *dev;
> +static void *dev_base;
> +
> +static void save_fn(QPCIDevice *dev, int devfn, void *data)
> +{
> +    QPCIDevice **pdev = (QPCIDevice **) data;
> +
> +    *pdev = dev;
> +}
> +
> +static QPCIDevice *get_device(void)
> +{
> +    QPCIDevice *dev;
> +
> +    pcibus = qpci_init_pc();
> +    qpci_device_foreach(pcibus, 0x10ec, 0x8139, save_fn, &dev);
> +    g_assert(dev != NULL);
> +
> +    return dev;
> +}
> +
> +#define PORT(name, len, val) \
> +static unsigned __attribute__((unused)) in_##name(void) \
> +{ \
> +    unsigned res = qpci_io_read##len(dev, dev_base+(val)); \
> +    g_test_message("*%s -> %x\n", #name, res); \
> +    return res; \
> +} \
> +static void out_##name(unsigned v) \
> +{ \
> +    g_test_message("%x -> *%s\n", v, #name); \
> +    qpci_io_write##len(dev, dev_base+(val), v); \
> +}
> +
> +PORT(Timer, l, 0x48)
> +PORT(IntrMask, w, 0x3c)
> +PORT(IntrStatus, w, 0x3E)
> +PORT(TimerInt, l, 0x54)
> +
> +#define fatal(...) do { g_test_message(__VA_ARGS__); g_assert(0); } while (0)
> +
> +static void test_timer(void)
> +{
> +    const unsigned from = 0.95 * CLK;
> +    const unsigned to = 1.6 * CLK;
> +    unsigned prev, curr, next;
> +    unsigned cnt, diff;
> +
> +    out_IntrMask(0);
> +
> +    in_IntrStatus();
> +    in_Timer();
> +    in_Timer();
> +
> +    /* Test 1. test counter continue and continue */
> +    out_TimerInt(0); /* disable timer */
> +    out_IntrStatus(0x4000);
> +    out_Timer(12345); /* reset timer to 0 */
> +    curr = in_Timer();
> +    if (curr > 0.1 * CLK) {
> +        fatal("time too big %u\n", curr);
> +    }
> +    for (cnt = 0; ; ) {
> +        clock_step(1 * NS_PER_SEC);
> +        prev = curr;
> +        curr = in_Timer();
> +
> +        /* test skip is in a specific range */
> +        diff = (curr-prev) & 0xffffffffu;
> +        if (diff < from || diff > to) {
> +            fatal("Invalid diff %u (%u-%u)\n", diff, from, to);
> +        }
> +        if (curr < prev && ++cnt == 3) {
> +            break;
> +        }
> +    }
> +
> +    /* Test 2. Check we didn't get an interrupt with TimerInt == 0 */
> +    if (in_IntrStatus() & 0x4000) {
> +        fatal("got an interrupt\n");
> +    }
> +
> +    /* Test 3. Setting TimerInt to 1 and Timer to 0 get interrupt */
> +    out_TimerInt(1);
> +    out_Timer(0);
> +    clock_step(40);
> +    if ((in_IntrStatus() & 0x4000) == 0) {
> +        fatal("we should have an interrupt here!\n");
> +    }
> +
> +    /* Test 3. Check acknowledge */
> +    out_IntrStatus(0x4000);
> +    if (in_IntrStatus() & 0x4000) {
> +        fatal("got an interrupt\n");
> +    }
> +
> +    /* Test. Status set after Timer reset */
> +    out_Timer(0);
> +    out_TimerInt(0);
> +    out_IntrStatus(0x4000);
> +    curr = in_Timer();
> +    out_TimerInt(curr + 0.5 * CLK);
> +    clock_step(1 * NS_PER_SEC);
> +    out_Timer(0);
> +    if ((in_IntrStatus() & 0x4000) == 0) {
> +        fatal("we should have an interrupt here!\n");
> +    }
> +
> +    /* Test. Status set after TimerInt reset */
> +    out_Timer(0);
> +    out_TimerInt(0);
> +    out_IntrStatus(0x4000);
> +    curr = in_Timer();
> +    out_TimerInt(curr + 0.5 * CLK);
> +    clock_step(1 * NS_PER_SEC);
> +    out_TimerInt(0);
> +    if ((in_IntrStatus() & 0x4000) == 0) {
> +        fatal("we should have an interrupt here!\n");
> +    }
> +
> +    /* Test 4. Increment TimerInt we should see an interrupt */
> +    curr = in_Timer();
> +    next = curr + 5.0 * CLK;
> +    out_TimerInt(next);
> +    for (cnt = 0; ; ) {
> +        clock_step(1 * NS_PER_SEC);
> +        prev = curr;
> +        curr = in_Timer();
> +        diff = (curr-prev) & 0xffffffffu;
> +        if (diff < from || diff > to) {
> +            fatal("Invalid diff %u (%u-%u)\n", diff, from, to);
> +        }
> +        if (cnt < 3 && curr > next) {
> +            if ((in_IntrStatus() & 0x4000) == 0) {
> +                fatal("we should have an interrupt here!\n");
> +            }
> +            out_IntrStatus(0x4000);
> +            next = curr + 5.0 * CLK;
> +            out_TimerInt(next);
> +            if (++cnt == 3) {
> +                out_TimerInt(1);
> +            }
> +        /* Test 5. Second time we pass from 0 should see an interrupt */
> +        } else if (cnt >= 3 && curr < prev) {
> +            /* here we should have an interrupt */
> +            if ((in_IntrStatus() & 0x4000) == 0) {
> +                fatal("we should have an interrupt here!\n");
> +            }
> +            out_IntrStatus(0x4000);
> +            if (++cnt == 5) {
> +                break;
> +            }
> +        }
> +    }
> +
> +    g_test_message("Everythink is ok!\n");
> +}
> +
> +
> +static void test_init(void)
> +{
> +    uint64_t barsize;
> +
> +    dev = get_device();
> +
> +    dev_base = qpci_iomap(dev, 0, &barsize);
> +
> +    g_assert(dev_base != NULL);
> +
> +    qpci_device_enable(dev);
> +
> +    test_timer();
> +}
> +
>  int main(int argc, char **argv)
>  {
>      int ret;
>  
>      g_test_init(&argc, &argv, NULL);
>      qtest_add_func("/rtl8139/nop", nop);
> +    qtest_add_func("/rtl8139/timer", test_init);
>  
>      qtest_start("-device rtl8139");
>      ret = g_test_run();
>