From: "Christian König" <ckoenig.leichtzumerken@gmail.com>
To: Andrey Grodzovsky <andrey.grodzovsky@amd.com>,
amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org
Cc: alexdeucher@gmail.com, daniel.vetter@ffwll.ch,
michel@daenzer.net, ppaalanen@gmail.com
Subject: Re: [PATCH v2 2/8] drm/ttm: Remap all page faults to per process dummy page.
Date: Mon, 22 Jun 2020 21:30:04 +0200 [thread overview]
Message-ID: <80798cef-1adc-088b-ee0c-54c13a31c425@gmail.com> (raw)
In-Reply-To: <1592719388-13819-3-git-send-email-andrey.grodzovsky@amd.com>
Am 21.06.20 um 08:03 schrieb Andrey Grodzovsky:
> On device removal reroute all CPU mappings to dummy page per drm_file
> instance or imported GEM object.
>
> Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
> ---
> drivers/gpu/drm/ttm/ttm_bo_vm.c | 65 ++++++++++++++++++++++++++++++++++++-----
> 1 file changed, 57 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c b/drivers/gpu/drm/ttm/ttm_bo_vm.c
> index 389128b..2f8bf5e 100644
> --- a/drivers/gpu/drm/ttm/ttm_bo_vm.c
> +++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c
> @@ -35,6 +35,8 @@
> #include <drm/ttm/ttm_bo_driver.h>
> #include <drm/ttm/ttm_placement.h>
> #include <drm/drm_vma_manager.h>
> +#include <drm/drm_drv.h>
> +#include <drm/drm_file.h>
> #include <linux/mm.h>
> #include <linux/pfn_t.h>
> #include <linux/rbtree.h>
> @@ -328,19 +330,66 @@ vm_fault_t ttm_bo_vm_fault(struct vm_fault *vmf)
> pgprot_t prot;
> struct ttm_buffer_object *bo = vma->vm_private_data;
> vm_fault_t ret;
> + int idx;
> + struct drm_device *ddev = bo->base.dev;
>
> - ret = ttm_bo_vm_reserve(bo, vmf);
> - if (ret)
> - return ret;
> + if (drm_dev_enter(ddev, &idx)) {
Better do this like if (!drm_dev_enter(...)) return ttm_bo_vm_dummy(..);
This way you can move all the dummy fault handling into a separate
function without cluttering this one here to much.
Christian.
> + ret = ttm_bo_vm_reserve(bo, vmf);
> + if (ret)
> + goto exit;
> +
> + prot = vma->vm_page_prot;
>
> - prot = vma->vm_page_prot;
> - ret = ttm_bo_vm_fault_reserved(vmf, prot, TTM_BO_VM_NUM_PREFAULT);
> - if (ret == VM_FAULT_RETRY && !(vmf->flags & FAULT_FLAG_RETRY_NOWAIT))
> + ret = ttm_bo_vm_fault_reserved(vmf, prot, TTM_BO_VM_NUM_PREFAULT);
> + if (ret == VM_FAULT_RETRY && !(vmf->flags & FAULT_FLAG_RETRY_NOWAIT))
> + goto exit;
> +
> + dma_resv_unlock(bo->base.resv);
> +
> +exit:
> + drm_dev_exit(idx);
> return ret;
> + } else {
>
> - dma_resv_unlock(bo->base.resv);
> + struct drm_file *file = NULL;
> + struct page *dummy_page = NULL;
> + int handle;
>
> - return ret;
> + /* We are faulting on imported BO from dma_buf */
> + if (bo->base.dma_buf && bo->base.import_attach) {
> + dummy_page = bo->base.dummy_page;
> + /* We are faulting on non imported BO, find drm_file owning the BO*/
> + } else {
> + struct drm_gem_object *gobj;
> +
> + mutex_lock(&ddev->filelist_mutex);
> + list_for_each_entry(file, &ddev->filelist, lhead) {
> + spin_lock(&file->table_lock);
> + idr_for_each_entry(&file->object_idr, gobj, handle) {
> + if (gobj == &bo->base) {
> + dummy_page = file->dummy_page;
> + break;
> + }
> + }
> + spin_unlock(&file->table_lock);
> + }
> + mutex_unlock(&ddev->filelist_mutex);
> + }
> +
> + if (dummy_page) {
> + /*
> + * Let do_fault complete the PTE install e.t.c using vmf->page
> + *
> + * TODO - should i call free_page somewhere ?
> + */
> + get_page(dummy_page);
> + vmf->page = dummy_page;
> + return 0;
> + } else {
> + return VM_FAULT_SIGSEGV;
> + }
> + }
> }
> EXPORT_SYMBOL(ttm_bo_vm_fault);
>
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next prev parent reply other threads:[~2020-06-22 19:30 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 [this message]
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
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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