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Message-ID: <e488da74-af52-62eb-d601-0e8a13cf0e87@amd.com>
Date: Wed, 12 Jul 2023 10:37:51 +0200
From: Christian König <christian.koenig@....com>
To: André Almeida <andrealmeid@...lia.com>,
dri-devel@...ts.freedesktop.org, amd-gfx@...ts.freedesktop.org,
linux-kernel@...r.kernel.org
Cc: kernel-dev@...lia.com, alexander.deucher@....com,
pierre-eric.pelloux-prayer@....com,
'Marek Olšák' <maraeo@...il.com>,
Samuel Pitoiset <samuel.pitoiset@...il.com>,
Bas Nieuwenhuizen <bas@...nieuwenhuizen.nl>,
Timur Kristóf <timur.kristof@...il.com>,
michel.daenzer@...lbox.org
Subject: Re: [PATCH 3/6] drm/amdgpu: Rework coredump to use memory dynamically
Am 11.07.23 um 23:34 schrieb André Almeida:
> Instead of storing coredump information inside amdgpu_device struct,
> move if to a proper separated struct and allocate it dynamically. This
> will make it easier to further expand the logged information.
Verry big NAK to this. The problem is that memory allocation isn't
allowed during a GPU reset.
What you could do is to allocate the memory with GFP_ATOMIC or similar,
but for a large structure that might not be possible.
Regards,
Christian.
>
> Signed-off-by: André Almeida <andrealmeid@...lia.com>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu.h | 14 +++--
> drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 65 ++++++++++++++--------
> 2 files changed, 51 insertions(+), 28 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> index dbe062a087c5..e1cc83a89d46 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> @@ -1068,11 +1068,6 @@ struct amdgpu_device {
> uint32_t *reset_dump_reg_list;
> uint32_t *reset_dump_reg_value;
> int num_regs;
> -#ifdef CONFIG_DEV_COREDUMP
> - struct amdgpu_task_info reset_task_info;
> - bool reset_vram_lost;
> - struct timespec64 reset_time;
> -#endif
>
> bool scpm_enabled;
> uint32_t scpm_status;
> @@ -1085,6 +1080,15 @@ struct amdgpu_device {
> uint32_t aid_mask;
> };
>
> +#ifdef CONFIG_DEV_COREDUMP
> +struct amdgpu_coredump_info {
> + struct amdgpu_device *adev;
> + struct amdgpu_task_info reset_task_info;
> + struct timespec64 reset_time;
> + bool reset_vram_lost;
> +};
> +#endif
> +
> static inline struct amdgpu_device *drm_to_adev(struct drm_device *ddev)
> {
> return container_of(ddev, struct amdgpu_device, ddev);
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> index e25f085ee886..23b9784e9787 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> @@ -4963,12 +4963,17 @@ static int amdgpu_reset_reg_dumps(struct amdgpu_device *adev)
> return 0;
> }
>
> -#ifdef CONFIG_DEV_COREDUMP
> +#ifndef CONFIG_DEV_COREDUMP
> +static void amdgpu_coredump(struct amdgpu_device *adev, bool vram_lost,
> + struct amdgpu_reset_context *reset_context)
> +{
> +}
> +#else
> static ssize_t amdgpu_devcoredump_read(char *buffer, loff_t offset,
> size_t count, void *data, size_t datalen)
> {
> struct drm_printer p;
> - struct amdgpu_device *adev = data;
> + struct amdgpu_coredump_info *coredump = data;
> struct drm_print_iterator iter;
> int i;
>
> @@ -4982,21 +4987,21 @@ static ssize_t amdgpu_devcoredump_read(char *buffer, loff_t offset,
> drm_printf(&p, "**** AMDGPU Device Coredump ****\n");
> drm_printf(&p, "kernel: " UTS_RELEASE "\n");
> drm_printf(&p, "module: " KBUILD_MODNAME "\n");
> - drm_printf(&p, "time: %lld.%09ld\n", adev->reset_time.tv_sec, adev->reset_time.tv_nsec);
> - if (adev->reset_task_info.pid)
> + drm_printf(&p, "time: %lld.%09ld\n", coredump->reset_time.tv_sec, coredump->reset_time.tv_nsec);
> + if (coredump->reset_task_info.pid)
> drm_printf(&p, "process_name: %s PID: %d\n",
> - adev->reset_task_info.process_name,
> - adev->reset_task_info.pid);
> + coredump->reset_task_info.process_name,
> + coredump->reset_task_info.pid);
>
> - if (adev->reset_vram_lost)
> + if (coredump->reset_vram_lost)
> drm_printf(&p, "VRAM is lost due to GPU reset!\n");
> - if (adev->num_regs) {
> + if (coredump->adev->num_regs) {
> drm_printf(&p, "AMDGPU register dumps:\nOffset: Value:\n");
>
> - for (i = 0; i < adev->num_regs; i++)
> + for (i = 0; i < coredump->adev->num_regs; i++)
> drm_printf(&p, "0x%08x: 0x%08x\n",
> - adev->reset_dump_reg_list[i],
> - adev->reset_dump_reg_value[i]);
> + coredump->adev->reset_dump_reg_list[i],
> + coredump->adev->reset_dump_reg_value[i]);
> }
>
> return count - iter.remain;
> @@ -5004,14 +5009,34 @@ static ssize_t amdgpu_devcoredump_read(char *buffer, loff_t offset,
>
> static void amdgpu_devcoredump_free(void *data)
> {
> + kfree(data);
> }
>
> -static void amdgpu_reset_capture_coredumpm(struct amdgpu_device *adev)
> +static void amdgpu_coredump(struct amdgpu_device *adev, bool vram_lost,
> + struct amdgpu_reset_context *reset_context)
> {
> + struct amdgpu_coredump_info *coredump;
> struct drm_device *dev = adev_to_drm(adev);
>
> - ktime_get_ts64(&adev->reset_time);
> - dev_coredumpm(dev->dev, THIS_MODULE, adev, 0, GFP_KERNEL,
> + coredump = kmalloc(sizeof(*coredump), GFP_KERNEL);
> +
> + if (!coredump) {
> + DRM_ERROR("%s: failed to allocate memory for coredump\n", __func__);
> + return;
> + }
> +
> + memset(coredump, 0, sizeof(*coredump));
> +
> + coredump->reset_vram_lost = vram_lost;
> +
> + if (reset_context->job && reset_context->job->vm)
> + coredump->reset_task_info = reset_context->job->vm->task_info;
> +
> + coredump->adev = adev;
> +
> + ktime_get_ts64(&coredump->reset_time);
> +
> + dev_coredumpm(dev->dev, THIS_MODULE, coredump, 0, GFP_KERNEL,
> amdgpu_devcoredump_read, amdgpu_devcoredump_free);
> }
> #endif
> @@ -5119,15 +5144,9 @@ int amdgpu_do_asic_reset(struct list_head *device_list_handle,
> goto out;
>
> vram_lost = amdgpu_device_check_vram_lost(tmp_adev);
> -#ifdef CONFIG_DEV_COREDUMP
> - tmp_adev->reset_vram_lost = vram_lost;
> - memset(&tmp_adev->reset_task_info, 0,
> - sizeof(tmp_adev->reset_task_info));
> - if (reset_context->job && reset_context->job->vm)
> - tmp_adev->reset_task_info =
> - reset_context->job->vm->task_info;
> - amdgpu_reset_capture_coredumpm(tmp_adev);
> -#endif
> +
> + amdgpu_coredump(tmp_adev, vram_lost, reset_context);
> +
> if (vram_lost) {
> DRM_INFO("VRAM is lost due to GPU reset!\n");
> amdgpu_inc_vram_lost(tmp_adev);
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