On Thu, Jun 27, 2019 at 04:10:36AM +0100, Lowry Li (Arm Technology China) wrote:
> Adds to print the event message when error happens and the same event
> will not be printed until next vsync.
>
> Signed-off-by: Lowry Li (Arm Technology China) <lowry.li@xxxxxxx>
> ---
> drivers/gpu/drm/arm/display/komeda/Makefile | 1 +
> drivers/gpu/drm/arm/display/komeda/komeda_dev.h | 13 ++
> drivers/gpu/drm/arm/display/komeda/komeda_event.c | 144 ++++++++++++++++++++++
> drivers/gpu/drm/arm/display/komeda/komeda_kms.c | 2 +
> 4 files changed, 160 insertions(+)
> create mode 100644 drivers/gpu/drm/arm/display/komeda/komeda_event.c
>
> diff --git a/drivers/gpu/drm/arm/display/komeda/Makefile b/drivers/gpu/drm/arm/display/komeda/Makefile
> index 38aa584..3f53d2d 100644
> --- a/drivers/gpu/drm/arm/display/komeda/Makefile
> +++ b/drivers/gpu/drm/arm/display/komeda/Makefile
> @@ -7,6 +7,7 @@ ccflags-y := \
> komeda-y := \
> komeda_drv.o \
> komeda_dev.o \
> + komeda_event.o \
> komeda_format_caps.o \
> komeda_coeffs.o \
> komeda_color_mgmt.o \
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_dev.h b/drivers/gpu/drm/arm/display/komeda/komeda_dev.h
> index 096f9f7..e863ec3 100644
> --- a/drivers/gpu/drm/arm/display/komeda/komeda_dev.h
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_dev.h
> @@ -40,6 +40,17 @@
> #define KOMEDA_ERR_TTNG BIT_ULL(30)
> #define KOMEDA_ERR_TTF BIT_ULL(31)
>
> +#define KOMEDA_ERR_EVENTS \
> + (KOMEDA_EVENT_URUN | KOMEDA_EVENT_IBSY | KOMEDA_EVENT_OVR |\
> + KOMEDA_ERR_TETO | KOMEDA_ERR_TEMR | KOMEDA_ERR_TITR |\
> + KOMEDA_ERR_CPE | KOMEDA_ERR_CFGE | KOMEDA_ERR_AXIE |\
> + KOMEDA_ERR_ACE0 | KOMEDA_ERR_ACE1 | KOMEDA_ERR_ACE2 |\
> + KOMEDA_ERR_ACE3 | KOMEDA_ERR_DRIFTTO | KOMEDA_ERR_FRAMETO |\
> + KOMEDA_ERR_ZME | KOMEDA_ERR_MERR | KOMEDA_ERR_TCF |\
> + KOMEDA_ERR_TTNG | KOMEDA_ERR_TTF)
> +
> +#define KOMEDA_WARN_EVENTS KOMEDA_ERR_CSCE
> +
> /* malidp device id */
> enum {
> MALI_D71 = 0,
> @@ -207,6 +218,8 @@ struct komeda_dev {
>
> struct komeda_dev *dev_to_mdev(struct device *dev);
>
> +void komeda_print_events(struct komeda_events *evts);
> +
> int komeda_dev_resume(struct komeda_dev *mdev);
> int komeda_dev_suspend(struct komeda_dev *mdev);
> #endif /*_KOMEDA_DEV_H_*/
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_event.c b/drivers/gpu/drm/arm/display/komeda/komeda_event.c
> new file mode 100644
> index 0000000..309dbe2
> --- /dev/null
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_event.c
> @@ -0,0 +1,144 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * (C) COPYRIGHT 2019 ARM Limited. All rights reserved.
> + * Author: James.Qian.Wang <james.qian.wang@xxxxxxx>
> + *
> + */
> +#include <drm/drm_print.h>
> +
> +#include "komeda_dev.h"
> +
> +struct komeda_str {
> + char *str;
> + u32 sz;
> + u32 len;
> +};
> +
> +/* return 0 on success, < 0 on no space.
> + */
> +static int komeda_sprintf(struct komeda_str *str, const char *fmt, ...)
> +{
> + va_list args;
> + int num, free_sz;
> + int err;
> +
> + free_sz = str->sz - str->len;
> + if (free_sz <= 0)
> + return -ENOSPC;
> +
> + va_start(args, fmt);
> +
> + num = vsnprintf(str->str + str->len, free_sz, fmt, args);
> +
> + va_end(args);
> +
> + if (num <= free_sz) {
> + str->len += num;
> + err = 0;
> + } else {
> + str->len = str->sz;
> + err = -ENOSPC;
> + }
> +
> + return err;
> +}
> +
> +static void evt_sprintf(struct komeda_str *str, u64 evt, const char *msg)
> +{
> + if (evt)
> + komeda_sprintf(str, msg);
> +}
Why do we need this wrapper?
> +
> +static void evt_str(struct komeda_str *str, u64 events)
> +{
> + if (events == 0ULL) {
> + evt_sprintf(str, 1, "None");
> + return;
> + }
> +
> + evt_sprintf(str, events & KOMEDA_EVENT_VSYNC, "VSYNC|");
> + evt_sprintf(str, events & KOMEDA_EVENT_FLIP, "FLIP|");
> + evt_sprintf(str, events & KOMEDA_EVENT_EOW, "EOW|");
> + evt_sprintf(str, events & KOMEDA_EVENT_MODE, "OP-MODE|");
> +
> + evt_sprintf(str, events & KOMEDA_EVENT_URUN, "UNDERRUN|");
> + evt_sprintf(str, events & KOMEDA_EVENT_OVR, "OVERRUN|");
> +
> + /* GLB error */
> + evt_sprintf(str, events & KOMEDA_ERR_MERR, "MERR|");
> + evt_sprintf(str, events & KOMEDA_ERR_FRAMETO, "FRAMETO|");
> +
> + /* DOU error */
> + evt_sprintf(str, events & KOMEDA_ERR_DRIFTTO, "DRIFTTO|");
> + evt_sprintf(str, events & KOMEDA_ERR_FRAMETO, "FRAMETO|");
> + evt_sprintf(str, events & KOMEDA_ERR_TETO, "TETO|");
> + evt_sprintf(str, events & KOMEDA_ERR_CSCE, "CSCE|");
> +
> + /* LPU errors or events */
> + evt_sprintf(str, events & KOMEDA_EVENT_IBSY, "IBSY|");
> + evt_sprintf(str, events & KOMEDA_ERR_AXIE, "AXIE|");
> + evt_sprintf(str, events & KOMEDA_ERR_ACE0, "ACE0|");
> + evt_sprintf(str, events & KOMEDA_ERR_ACE1, "ACE1|");
> + evt_sprintf(str, events & KOMEDA_ERR_ACE2, "ACE2|");
> + evt_sprintf(str, events & KOMEDA_ERR_ACE3, "ACE3|");
> +
> + /* LPU TBU errors*/
> + evt_sprintf(str, events & KOMEDA_ERR_TCF, "TCF|");
> + evt_sprintf(str, events & KOMEDA_ERR_TTNG, "TTNG|");
> + evt_sprintf(str, events & KOMEDA_ERR_TITR, "TITR|");
> + evt_sprintf(str, events & KOMEDA_ERR_TEMR, "TEMR|");
> + evt_sprintf(str, events & KOMEDA_ERR_TTF, "TTF|");
> +
> + /* CU errors*/
> + evt_sprintf(str, events & KOMEDA_ERR_CPE, "COPROC|");
> + evt_sprintf(str, events & KOMEDA_ERR_ZME, "ZME|");
> + evt_sprintf(str, events & KOMEDA_ERR_CFGE, "CFGE|");
> + evt_sprintf(str, events & KOMEDA_ERR_TEMR, "TEMR|");
> +
> + if (str->len > 0 && (str->str[str->len - 1] == '|')) {
> + str->str[str->len - 1] = 0;
> + str->len--;
> + }
> +}
> +
> +static bool is_new_frame(struct komeda_events *a)
> +{
> + return (a->pipes[0] | a->pipes[1]) & KOMEDA_EVENT_FLIP;
> +}
> +
> +void komeda_print_events(struct komeda_events *evts)
> +{
> + u64 print_evts = KOMEDA_ERR_EVENTS;
> + static bool en_print = true;
> +
> + /* reduce the same msg print, only print the first evt for one frame */
> + if (evts->global || is_new_frame(evts))
> + en_print = true;
> + if (!en_print)
> + return;
When does en_print ever get false?
> +
> +#ifdef DEBUG
> + print_evts |= KOMEDA_WARN_EVENTS;
> +#endif
> +
> + if ((evts->global | evts->pipes[0] | evts->pipes[1]) & print_evts) {
> + #define STR_SZ 128
> + char msg[STR_SZ];
I've counted about 27 evt_sprintf() calls in evt_str() function, with an
average of 5 characters each, so thats 135 characters printed into a buffer
that is only 128 bytes. Please don't do this!
> + struct komeda_str str;
> +
> + str.str = msg;
> + str.sz = STR_SZ;
> + str.len = 0;
> +
> + komeda_sprintf(&str, "gcu: ");
> + evt_str(&str, evts->global);
> + komeda_sprintf(&str, ", pipes[0]: ");
> + evt_str(&str, evts->pipes[0]);
> + komeda_sprintf(&str, ", pipes[1]: ");
> + evt_str(&str, evts->pipes[1]);
> +
> + DRM_ERROR("err detect: %s\n", msg);
> +
> + en_print = false;
> + }
> +}
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_kms.c b/drivers/gpu/drm/arm/display/komeda/komeda_kms.c
> index 647bce5..1462bac 100644
> --- a/drivers/gpu/drm/arm/display/komeda/komeda_kms.c
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_kms.c
> @@ -47,6 +47,8 @@ static irqreturn_t komeda_kms_irq_handler(int irq, void *data)
> memset(&evts, 0, sizeof(evts));
> status = mdev->funcs->irq_handler(mdev, &evts);
>
> + komeda_print_events(&evts);
Calling this function from the IRQ handler is a bad idea. We should use debugfs
if you really want to have a trace of the events, but I personally don't see
value in having this functionality in the kernel at all. You can expose the
value of the evts->global and evts->pipes[] as integers and decode that in
userspace or as a debugfs entry.
Best regards,
Liviu
> +
> /* Notify the crtc to handle the events */
> for (i = 0; i < kms->n_crtcs; i++)
> komeda_crtc_handle_event(&kms->crtcs[i], &evts);
> --
> 1.9.1
>
--
====================
| I would like to |
| fix the world, |
| but they're not |
| giving me the |
\ source code! /
---------------
¯\_(ツ)_/¯
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