[RFC] tests: rtl8139: test timers and interrupt

Test behaviour of timers and interrupts related to timeouts.

Signed-off-by: Frediano Ziglio <freddy77@gmail.com>
---
 tests/Makefile       |   2 +-
 tests/rtl8139-test.c | 164 +++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 165 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?

On Thu, 01/08 00:07, 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 | 164 +++++++++++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 165 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?
> 
> 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..87f1792 100644
> --- a/tests/rtl8139-test.c
> +++ b/tests/rtl8139-test.c
> @@ -10,19 +10,183 @@
>  #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 = NULL;
> +static void *dev_base = NULL;
> +
> +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;
> +
> +    out_IntrMask(0);
> +
> +    in_IntrStatus();
> +    in_Timer();
> +    in_Timer();
> +
> +    // Test 1. test counter continue and continue

Plesae use /* */ for comments in this patch. There are also other coding style
issues, please test it with scripts/checkpatch.pl and fix them in next version.

Thanks,
Fam

> +    out_TimerInt(0); // disable timer
> +    out_IntrStatus(0x4000);
> +    out_Timer(12345); // reset timer to 0
> +    unsigned curr = in_Timer();
> +    unsigned cnt;
> +    if (curr > 0.1 * CLK)
> +        fatal("time too big %u\n", curr);
> +    for (cnt=0;;) {
> +        clock_step(1 * NS_PER_SEC);
> +        unsigned prev = curr;
> +        curr = in_Timer();
> +
> +        // test skip is in a specific range
> +        unsigned 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();
> +    unsigned next = curr + 5.0 * CLK;
> +    out_TimerInt(next);
> +    for (cnt=0;;) {
> +        clock_step(1 * NS_PER_SEC);
> +        unsigned prev = curr;
> +        curr = in_Timer();
> +        unsigned 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();
> -- 
> 1.9.1
>