From: Greg KH <gregkh@linuxfoundation.org>
To: Daniel Vetter <daniel@ffwll.ch>,
Andrey Grodzovsky <andrey.grodzovsky@amd.com>
Cc: daniel.vetter@ffwll.ch, michel@daenzer.net,
dri-devel@lists.freedesktop.org, ppaalanen@gmail.com,
amd-gfx@lists.freedesktop.org, ckoenig.leichtzumerken@gmail.com,
alexdeucher@gmail.com
Subject: Re: [PATCH v2 5/8] drm/amdgpu: Refactor sysfs removal
Date: Mon, 22 Jun 2020 13:21:39 +0200 [thread overview]
Message-ID: <20200622112139.GA3421602@kroah.com> (raw)
In-Reply-To: <20200622095124.GE20149@phenom.ffwll.local>
On Mon, Jun 22, 2020 at 11:51:24AM +0200, Daniel Vetter wrote:
> On Sun, Jun 21, 2020 at 02:03:05AM -0400, Andrey Grodzovsky wrote:
> > Track sysfs files in a list so they all can be removed during pci remove
> > since otherwise their removal after that causes crash because parent
> > folder was already removed during pci remove.
Huh? That should not happen, do you have a backtrace of that crash?
> > Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
>
> Uh I thought sysfs just gets yanked completely. Please check with Greg KH
> whether hand-rolling all this really is the right solution here ... Feels
> very wrong. I thought this was all supposed to work by adding attributes
> before publishing the sysfs node, and then letting sysfs clean up
> everything. Not by cleaning up manually yourself.
Yes, that is supposed to be the correct thing to do.
>
> Adding Greg for an authoritative answer.
> -Daniel
>
> > ---
> > drivers/gpu/drm/amd/amdgpu/amdgpu.h | 13 +++++++++++
> > drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c | 7 +++++-
> > drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 35 ++++++++++++++++++++++++----
> > drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c | 12 ++++++----
> > drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c | 8 ++++++-
> > drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c | 17 ++++++++++++--
> > drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c | 13 ++++++++++-
> > drivers/gpu/drm/amd/amdgpu/df_v3_6.c | 10 +++++---
> > 8 files changed, 99 insertions(+), 16 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> > index 604a681..ba3775f 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> > @@ -726,6 +726,15 @@ struct amd_powerplay {
> >
> > #define AMDGPU_RESET_MAGIC_NUM 64
> > #define AMDGPU_MAX_DF_PERFMONS 4
> > +
> > +struct amdgpu_sysfs_list_node {
> > + struct list_head head;
> > + struct device_attribute *attr;
> > +};
You know we have lists of attributes already, called attribute groups,
if you really wanted to do something like this. But, I don't think so.
Either way, don't hand-roll your own stuff that the driver core has
provided for you for a decade or more, that's just foolish :)
> > +
> > +#define AMDGPU_DEVICE_ATTR_LIST_NODE(_attr) \
> > + struct amdgpu_sysfs_list_node dev_attr_handle_##_attr = {.attr = &dev_attr_##_attr}
> > +
> > struct amdgpu_device {
> > struct device *dev;
> > struct drm_device *ddev;
> > @@ -992,6 +1001,10 @@ struct amdgpu_device {
> > char product_number[16];
> > char product_name[32];
> > char serial[16];
> > +
> > + struct list_head sysfs_files_list;
> > + struct mutex sysfs_files_list_lock;
> > +
> > };
> >
> > static inline struct amdgpu_device *amdgpu_ttm_adev(struct ttm_bo_device *bdev)
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c
> > index fdd52d8..c1549ee 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c
> > @@ -1950,8 +1950,10 @@ static ssize_t amdgpu_atombios_get_vbios_version(struct device *dev,
> > return snprintf(buf, PAGE_SIZE, "%s\n", ctx->vbios_version);
> > }
> >
> > +
> > static DEVICE_ATTR(vbios_version, 0444, amdgpu_atombios_get_vbios_version,
> > NULL);
> > +static AMDGPU_DEVICE_ATTR_LIST_NODE(vbios_version);
> >
> > /**
> > * amdgpu_atombios_fini - free the driver info and callbacks for atombios
> > @@ -1972,7 +1974,6 @@ void amdgpu_atombios_fini(struct amdgpu_device *adev)
> > adev->mode_info.atom_context = NULL;
> > kfree(adev->mode_info.atom_card_info);
> > adev->mode_info.atom_card_info = NULL;
> > - device_remove_file(adev->dev, &dev_attr_vbios_version);
> > }
> >
> > /**
> > @@ -2038,6 +2039,10 @@ int amdgpu_atombios_init(struct amdgpu_device *adev)
> > return ret;
> > }
> >
> > + mutex_lock(&adev->sysfs_files_list_lock);
> > + list_add_tail(&dev_attr_handle_vbios_version.head, &adev->sysfs_files_list);
> > + mutex_unlock(&adev->sysfs_files_list_lock);
> > +
> > return 0;
> > }
> >
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> > index e7b9065..3173046 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> > @@ -2928,6 +2928,12 @@ static const struct attribute *amdgpu_dev_attributes[] = {
> > NULL
> > };
> >
> > +static AMDGPU_DEVICE_ATTR_LIST_NODE(product_name);
> > +static AMDGPU_DEVICE_ATTR_LIST_NODE(product_number);
> > +static AMDGPU_DEVICE_ATTR_LIST_NODE(serial_number);
> > +static AMDGPU_DEVICE_ATTR_LIST_NODE(pcie_replay_count);
> > +
> > +
> > /**
> > * amdgpu_device_init - initialize the driver
> > *
> > @@ -3029,6 +3035,9 @@ int amdgpu_device_init(struct amdgpu_device *adev,
> > INIT_LIST_HEAD(&adev->shadow_list);
> > mutex_init(&adev->shadow_list_lock);
> >
> > + INIT_LIST_HEAD(&adev->sysfs_files_list);
> > + mutex_init(&adev->sysfs_files_list_lock);
> > +
> > INIT_DELAYED_WORK(&adev->delayed_init_work,
> > amdgpu_device_delayed_init_work_handler);
> > INIT_DELAYED_WORK(&adev->gfx.gfx_off_delay_work,
> > @@ -3281,6 +3290,13 @@ int amdgpu_device_init(struct amdgpu_device *adev,
> > if (r) {
> > dev_err(adev->dev, "Could not create amdgpu device attr\n");
> > return r;
> > + } else {
> > + mutex_lock(&adev->sysfs_files_list_lock);
> > + list_add_tail(&dev_attr_handle_product_name.head, &adev->sysfs_files_list);
> > + list_add_tail(&dev_attr_handle_product_number.head, &adev->sysfs_files_list);
> > + list_add_tail(&dev_attr_handle_serial_number.head, &adev->sysfs_files_list);
> > + list_add_tail(&dev_attr_handle_pcie_replay_count.head, &adev->sysfs_files_list);
> > + mutex_unlock(&adev->sysfs_files_list_lock);
> > }
> >
> > if (IS_ENABLED(CONFIG_PERF_EVENTS))
> > @@ -3298,6 +3314,16 @@ int amdgpu_device_init(struct amdgpu_device *adev,
> > return r;
> > }
> >
> > +static void amdgpu_sysfs_remove_files(struct amdgpu_device *adev)
> > +{
> > + struct amdgpu_sysfs_list_node *node;
> > +
> > + mutex_lock(&adev->sysfs_files_list_lock);
> > + list_for_each_entry(node, &adev->sysfs_files_list, head)
> > + device_remove_file(adev->dev, node->attr);
> > + mutex_unlock(&adev->sysfs_files_list_lock);
> > +}
> > +
> > /**
> > * amdgpu_device_fini - tear down the driver
> > *
> > @@ -3332,6 +3358,11 @@ void amdgpu_device_fini_early(struct amdgpu_device *adev)
> > amdgpu_fbdev_fini(adev);
> >
> > amdgpu_irq_fini_early(adev);
> > +
> > + amdgpu_sysfs_remove_files(adev);
> > +
> > + if (adev->ucode_sysfs_en)
> > + amdgpu_ucode_sysfs_fini(adev);
> > }
> >
> > void amdgpu_device_fini_late(struct amdgpu_device *adev)
> > @@ -3366,10 +3397,6 @@ void amdgpu_device_fini_late(struct amdgpu_device *adev)
> > adev->rmmio = NULL;
> > amdgpu_device_doorbell_fini(adev);
> >
> > - if (adev->ucode_sysfs_en)
> > - amdgpu_ucode_sysfs_fini(adev);
> > -
> > - sysfs_remove_files(&adev->dev->kobj, amdgpu_dev_attributes);
> > if (IS_ENABLED(CONFIG_PERF_EVENTS))
> > amdgpu_pmu_fini(adev);
> > if (amdgpu_discovery && adev->asic_type >= CHIP_NAVI10)
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
> > index 6271044..e7b6c4a 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
> > @@ -76,6 +76,9 @@ static DEVICE_ATTR(mem_info_gtt_total, S_IRUGO,
> > static DEVICE_ATTR(mem_info_gtt_used, S_IRUGO,
> > amdgpu_mem_info_gtt_used_show, NULL);
> >
> > +static AMDGPU_DEVICE_ATTR_LIST_NODE(mem_info_gtt_total);
> > +static AMDGPU_DEVICE_ATTR_LIST_NODE(mem_info_gtt_used);
> > +
> > /**
> > * amdgpu_gtt_mgr_init - init GTT manager and DRM MM
> > *
> > @@ -114,6 +117,11 @@ static int amdgpu_gtt_mgr_init(struct ttm_mem_type_manager *man,
> > return ret;
> > }
> >
> > + mutex_lock(&adev->sysfs_files_list_lock);
> > + list_add_tail(&dev_attr_handle_mem_info_gtt_total.head, &adev->sysfs_files_list);
> > + list_add_tail(&dev_attr_handle_mem_info_gtt_used.head, &adev->sysfs_files_list);
> > + mutex_unlock(&adev->sysfs_files_list_lock);
> > +
> > return 0;
> > }
> >
> > @@ -127,7 +135,6 @@ static int amdgpu_gtt_mgr_init(struct ttm_mem_type_manager *man,
> > */
> > static int amdgpu_gtt_mgr_fini(struct ttm_mem_type_manager *man)
> > {
> > - struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev);
> > struct amdgpu_gtt_mgr *mgr = man->priv;
> > spin_lock(&mgr->lock);
> > drm_mm_takedown(&mgr->mm);
> > @@ -135,9 +142,6 @@ static int amdgpu_gtt_mgr_fini(struct ttm_mem_type_manager *man)
> > kfree(mgr);
> > man->priv = NULL;
> >
> > - device_remove_file(adev->dev, &dev_attr_mem_info_gtt_total);
> > - device_remove_file(adev->dev, &dev_attr_mem_info_gtt_used);
> > -
> > return 0;
> > }
> >
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c
> > index ddb4af0c..554fec0 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c
> > @@ -2216,6 +2216,8 @@ static DEVICE_ATTR(usbc_pd_fw, S_IRUGO | S_IWUSR,
> > psp_usbc_pd_fw_sysfs_read,
> > psp_usbc_pd_fw_sysfs_write);
> >
> > +static AMDGPU_DEVICE_ATTR_LIST_NODE(usbc_pd_fw);
> > +
> >
> >
> > const struct amd_ip_funcs psp_ip_funcs = {
> > @@ -2242,13 +2244,17 @@ static int psp_sysfs_init(struct amdgpu_device *adev)
> >
> > if (ret)
> > DRM_ERROR("Failed to create USBC PD FW control file!");
> > + else {
> > + mutex_lock(&adev->sysfs_files_list_lock);
> > + list_add_tail(&dev_attr_handle_usbc_pd_fw.head, &adev->sysfs_files_list);
> > + mutex_unlock(&adev->sysfs_files_list_lock);
> > + }
> >
> > return ret;
> > }
> >
> > static void psp_sysfs_fini(struct amdgpu_device *adev)
> > {
> > - device_remove_file(adev->dev, &dev_attr_usbc_pd_fw);
> > }
> >
> > const struct amdgpu_ip_block_version psp_v3_1_ip_block =
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
> > index 7723937..39c400c 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
> > @@ -148,6 +148,12 @@ static DEVICE_ATTR(mem_info_vis_vram_used, S_IRUGO,
> > static DEVICE_ATTR(mem_info_vram_vendor, S_IRUGO,
> > amdgpu_mem_info_vram_vendor, NULL);
> >
> > +static AMDGPU_DEVICE_ATTR_LIST_NODE(mem_info_vram_total);
> > +static AMDGPU_DEVICE_ATTR_LIST_NODE(mem_info_vis_vram_total);
> > +static AMDGPU_DEVICE_ATTR_LIST_NODE(mem_info_vram_used);
> > +static AMDGPU_DEVICE_ATTR_LIST_NODE(mem_info_vis_vram_used);
> > +static AMDGPU_DEVICE_ATTR_LIST_NODE(mem_info_vram_vendor);
Converting all of these individual attributes to an attribute group
would be a nice thing to do anyway. Makes your logic much simpler and
less error-prone.
But again, the driver core should do all of the device file removal
stuff automatically for you when your PCI device is removed from the
system _UNLESS_ you are doing crazy things like creating child devices
or messing with raw kobjects or other horrible things that I haven't
read the code to see if you are, but hopefully not :)
thanks,
greg k-h
_______________________________________________
amd-gfx mailing list
amd-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/amd-gfx
next prev parent reply other threads:[~2020-06-22 13:31 UTC|newest]
Thread overview: 97+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-21 6:03 [PATCH v2 0/8] RFC Support hot device unplug in amdgpu Andrey Grodzovsky
2020-06-21 6:03 ` [PATCH v2 1/8] drm: Add dummy page per device or GEM object Andrey Grodzovsky
2020-06-22 9:35 ` Daniel Vetter
2020-06-22 14:21 ` Pekka Paalanen
2020-06-22 14:24 ` Daniel Vetter
2020-06-22 14:28 ` Pekka Paalanen
2020-11-09 20:34 ` Andrey Grodzovsky
2020-11-15 6:39 ` Andrey Grodzovsky
2020-06-22 13:18 ` Christian König
2020-06-22 14:23 ` Daniel Vetter
2020-06-22 14:32 ` Andrey Grodzovsky
2020-06-22 17:45 ` Christian König
2020-06-22 17:50 ` Daniel Vetter
2020-11-09 20:53 ` Andrey Grodzovsky
2020-11-13 20:52 ` Andrey Grodzovsky
2020-11-14 8:41 ` Christian König
2020-11-14 9:51 ` Daniel Vetter
2020-11-14 9:57 ` Daniel Vetter
2020-11-16 9:42 ` Michel Dänzer
2020-11-15 6:34 ` Andrey Grodzovsky
2020-11-16 9:48 ` Christian König
2020-11-16 19:00 ` Andrey Grodzovsky
2020-11-16 20:36 ` Christian König
2020-11-16 20:42 ` Andrey Grodzovsky
2020-11-19 10:01 ` Christian König
2020-06-21 6:03 ` [PATCH v2 2/8] drm/ttm: Remap all page faults to per process dummy page Andrey Grodzovsky
2020-06-22 9:41 ` Daniel Vetter
2020-06-24 3:31 ` Andrey Grodzovsky
2020-06-24 7:19 ` Daniel Vetter
2020-11-10 17:41 ` Andrey Grodzovsky
2020-06-22 19:30 ` Christian König
2020-06-21 6:03 ` [PATCH v2 3/8] drm/ttm: Add unampping of the entire device address space Andrey Grodzovsky
2020-06-22 9:45 ` Daniel Vetter
2020-06-23 5:00 ` Andrey Grodzovsky
2020-06-23 10:25 ` Daniel Vetter
2020-06-23 12:55 ` Christian König
2020-06-22 19:37 ` Christian König
2020-06-22 19:47 ` Alex Deucher
2020-06-21 6:03 ` [PATCH v2 4/8] drm/amdgpu: Split amdgpu_device_fini into early and late Andrey Grodzovsky
2020-06-22 9:48 ` Daniel Vetter
2020-11-12 4:19 ` Andrey Grodzovsky
2020-11-12 9:29 ` Daniel Vetter
2020-06-21 6:03 ` [PATCH v2 5/8] drm/amdgpu: Refactor sysfs removal Andrey Grodzovsky
2020-06-22 9:51 ` Daniel Vetter
2020-06-22 11:21 ` Greg KH [this message]
2020-06-22 16:07 ` Andrey Grodzovsky
2020-06-22 16:45 ` Greg KH
2020-06-23 4:51 ` Andrey Grodzovsky
2020-06-23 6:05 ` Greg KH
2020-06-24 3:04 ` Andrey Grodzovsky
2020-06-24 6:11 ` Greg KH
2020-06-25 1:52 ` Andrey Grodzovsky
2020-11-10 17:54 ` Andrey Grodzovsky
2020-11-10 17:59 ` Greg KH
2020-11-11 15:13 ` Andrey Grodzovsky
2020-11-11 15:34 ` Greg KH
2020-11-11 15:45 ` Andrey Grodzovsky
2020-11-11 16:06 ` Greg KH
2020-11-11 16:34 ` Andrey Grodzovsky
2020-12-02 15:48 ` Andrey Grodzovsky
2020-12-02 17:34 ` Greg KH
2020-12-02 18:02 ` Andrey Grodzovsky
2020-12-02 18:20 ` Greg KH
2020-12-02 18:40 ` Andrey Grodzovsky
2020-06-22 13:19 ` Christian König
2020-06-21 6:03 ` [PATCH v2 6/8] drm/amdgpu: Unmap entire device address space on device remove Andrey Grodzovsky
2020-06-22 9:56 ` Daniel Vetter
2020-06-22 19:38 ` Christian König
2020-06-22 19:48 ` Alex Deucher
2020-06-23 10:22 ` Daniel Vetter
2020-06-23 13:16 ` Christian König
2020-06-24 3:12 ` Andrey Grodzovsky
2020-06-21 6:03 ` [PATCH v2 7/8] drm/amdgpu: Fix sdma code crash post device unplug Andrey Grodzovsky
2020-06-22 9:55 ` Daniel Vetter
2020-06-22 19:40 ` Christian König
2020-06-23 5:11 ` Andrey Grodzovsky
2020-06-23 7:14 ` Christian König
2020-06-21 6:03 ` [PATCH v2 8/8] drm/amdgpu: Prevent any job recoveries after device is unplugged Andrey Grodzovsky
2020-06-22 9:53 ` Daniel Vetter
2020-11-17 18:38 ` Andrey Grodzovsky
2020-11-17 18:52 ` Daniel Vetter
2020-11-17 19:18 ` Andrey Grodzovsky
2020-11-17 19:49 ` Daniel Vetter
2020-11-17 20:07 ` Andrey Grodzovsky
2020-11-18 7:39 ` Daniel Vetter
2020-11-18 12:01 ` Christian König
2020-11-18 15:43 ` Luben Tuikov
2020-11-18 16:20 ` Andrey Grodzovsky
2020-11-19 7:55 ` Christian König
2020-11-19 15:02 ` Andrey Grodzovsky
2020-11-19 15:29 ` Daniel Vetter
2020-11-19 21:24 ` Andrey Grodzovsky
2020-11-18 0:46 ` Luben Tuikov
2020-06-22 9:46 ` [PATCH v2 0/8] RFC Support hot device unplug in amdgpu Daniel Vetter
2020-06-23 5:14 ` Andrey Grodzovsky
2020-06-23 9:04 ` Michel Dänzer
2020-06-24 3:21 ` Andrey Grodzovsky
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