From: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
To: dri-devel@lists.freedesktop.org, amd-gfx@lists.freedesktop.org,
linux-pci@vger.kernel.org, ckoenig.leichtzumerken@gmail.com,
daniel.vetter@ffwll.ch, Harry.Wentland@amd.com
Cc: ppaalanen@gmail.com, Alexander.Deucher@amd.com,
gregkh@linuxfoundation.org, helgaas@kernel.org,
Felix.Kuehling@amd.com,
Andrey Grodzovsky <andrey.grodzovsky@amd.com>
Subject: [PATCH v6 01/16] drm/ttm: Remap all page faults to per process dummy page.
Date: Mon, 10 May 2021 12:36:10 -0400 [thread overview]
Message-ID: <20210510163625.407105-2-andrey.grodzovsky@amd.com> (raw)
In-Reply-To: <20210510163625.407105-1-andrey.grodzovsky@amd.com>
On device removal reroute all CPU mappings to dummy page.
v3:
Remove loop to find DRM file and instead access it
by vma->vm_file->private_data. Move dummy page installation
into a separate function.
v4:
Map the entire BOs VA space into on demand allocated dummy page
on the first fault for that BO.
v5: Remove duplicate return.
v6: Polish ttm_bo_vm_dummy_page, remove superflous code.
Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
---
drivers/gpu/drm/ttm/ttm_bo_vm.c | 57 ++++++++++++++++++++++++++++++++-
include/drm/ttm/ttm_bo_api.h | 2 ++
2 files changed, 58 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c b/drivers/gpu/drm/ttm/ttm_bo_vm.c
index b31b18058965..e5a9615519d1 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_vm.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c
@@ -34,6 +34,8 @@
#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_managed.h>
#include <linux/mm.h>
#include <linux/pfn_t.h>
#include <linux/rbtree.h>
@@ -380,19 +382,72 @@ vm_fault_t ttm_bo_vm_fault_reserved(struct vm_fault *vmf,
}
EXPORT_SYMBOL(ttm_bo_vm_fault_reserved);
+static void ttm_bo_release_dummy_page(struct drm_device *dev, void *res)
+{
+ struct page *dummy_page = (struct page *)res;
+
+ __free_page(dummy_page);
+}
+
+vm_fault_t ttm_bo_vm_dummy_page(struct vm_fault *vmf, pgprot_t prot)
+{
+ struct vm_area_struct *vma = vmf->vma;
+ struct ttm_buffer_object *bo = vma->vm_private_data;
+ struct drm_device *ddev = bo->base.dev;
+ vm_fault_t ret = VM_FAULT_NOPAGE;
+ unsigned long address;
+ unsigned long pfn;
+ struct page *page;
+
+ /* Allocate new dummy page to map all the VA range in this VMA to it*/
+ page = alloc_page(GFP_KERNEL | __GFP_ZERO);
+ if (!page)
+ return VM_FAULT_OOM;
+
+ pfn = page_to_pfn(page);
+
+ /* Prefault the entire VMA range right away to avoid further faults */
+ for (address = vma->vm_start; address < vma->vm_end; address += PAGE_SIZE) {
+
+ if (unlikely(address >= vma->vm_end))
+ break;
+
+ if (vma->vm_flags & VM_MIXEDMAP)
+ ret = vmf_insert_mixed_prot(vma, address,
+ __pfn_to_pfn_t(pfn, PFN_DEV),
+ prot);
+ else
+ ret = vmf_insert_pfn_prot(vma, address, pfn, prot);
+ }
+
+ /* Set the page to be freed using drmm release action */
+ if (drmm_add_action_or_reset(ddev, ttm_bo_release_dummy_page, page))
+ return VM_FAULT_OOM;
+
+ return ret;
+}
+EXPORT_SYMBOL(ttm_bo_vm_dummy_page);
+
vm_fault_t ttm_bo_vm_fault(struct vm_fault *vmf)
{
struct vm_area_struct *vma = vmf->vma;
pgprot_t prot;
struct ttm_buffer_object *bo = vma->vm_private_data;
+ struct drm_device *ddev = bo->base.dev;
vm_fault_t ret;
+ int idx;
ret = ttm_bo_vm_reserve(bo, vmf);
if (ret)
return ret;
prot = vma->vm_page_prot;
- ret = ttm_bo_vm_fault_reserved(vmf, prot, TTM_BO_VM_NUM_PREFAULT, 1);
+ if (drm_dev_enter(ddev, &idx)) {
+ ret = ttm_bo_vm_fault_reserved(vmf, prot, TTM_BO_VM_NUM_PREFAULT, 1);
+ drm_dev_exit(idx);
+ } else {
+ ret = ttm_bo_vm_dummy_page(vmf, prot);
+ }
if (ret == VM_FAULT_RETRY && !(vmf->flags & FAULT_FLAG_RETRY_NOWAIT))
return ret;
diff --git a/include/drm/ttm/ttm_bo_api.h b/include/drm/ttm/ttm_bo_api.h
index 639521880c29..254ede97f8e3 100644
--- a/include/drm/ttm/ttm_bo_api.h
+++ b/include/drm/ttm/ttm_bo_api.h
@@ -620,4 +620,6 @@ int ttm_bo_vm_access(struct vm_area_struct *vma, unsigned long addr,
void *buf, int len, int write);
bool ttm_bo_delayed_delete(struct ttm_device *bdev, bool remove_all);
+vm_fault_t ttm_bo_vm_dummy_page(struct vm_fault *vmf, pgprot_t prot);
+
#endif
--
2.25.1
next prev parent reply other threads:[~2021-05-10 16:36 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-10 16:36 [PATCH v6 00/16] RFC Support hot device unplug in amdgpu Andrey Grodzovsky
2021-05-10 16:36 ` Andrey Grodzovsky [this message]
2021-05-11 6:38 ` [PATCH v6 01/16] drm/ttm: Remap all page faults to per process dummy page Christian König
2021-05-11 14:44 ` Andrey Grodzovsky
2021-05-11 15:12 ` Christian König
2021-05-10 16:36 ` [PATCH v6 02/16] drm/ttm: Expose ttm_tt_unpopulate for driver use Andrey Grodzovsky
2021-05-10 18:27 ` Felix Kuehling
2021-05-10 18:32 ` Andrey Grodzovsky
2021-05-10 16:36 ` [PATCH v6 03/16] drm/amdgpu: Split amdgpu_device_fini into early and late Andrey Grodzovsky
2021-05-10 23:49 ` kernel test robot
2021-05-10 16:36 ` [PATCH v6 04/16] drm/amdkfd: Split kfd suspend from devie exit Andrey Grodzovsky
2021-05-11 6:40 ` Christian König
2021-05-11 14:52 ` Andrey Grodzovsky
2021-05-10 16:36 ` [PATCH v6 05/16] drm/amdgpu: Add early fini callback Andrey Grodzovsky
2021-05-11 6:41 ` Christian König
2021-05-10 16:36 ` [PATCH v6 06/16] drm/amdgpu: Handle IOMMU enabled case Andrey Grodzovsky
2021-05-11 6:44 ` Christian König
2021-05-11 15:46 ` Andrey Grodzovsky
2021-05-11 15:56 ` Alex Deucher
2021-05-11 15:59 ` Andrey Grodzovsky
2021-05-10 16:36 ` [PATCH v6 07/16] drm/amdgpu: Remap all page faults to per process dummy page Andrey Grodzovsky
2021-05-10 16:36 ` [PATCH v6 08/16] PCI: Add support for dev_groups to struct pci_device_driver Andrey Grodzovsky
2021-05-10 20:56 ` Bjorn Helgaas
2021-05-10 16:36 ` [PATCH v6 09/16] drm/amdgpu: Convert driver sysfs attributes to static attributes Andrey Grodzovsky
2021-05-10 16:36 ` [PATCH v6 10/16] drm/amdgpu: Guard against write accesses after device removal Andrey Grodzovsky
2021-05-11 6:50 ` Christian König
2021-05-11 17:52 ` Andrey Grodzovsky
2021-05-12 14:01 ` Andrey Grodzovsky
2021-05-12 14:06 ` Christian König
2021-05-12 14:11 ` Andrey Grodzovsky
2021-05-10 16:36 ` [PATCH v6 11/16] drm/sched: Make timeout timer rearm conditional Andrey Grodzovsky
2021-05-11 6:52 ` Christian König
2021-05-10 16:36 ` [PATCH v6 12/16] drm/amdgpu: Prevent any job recoveries after device is unplugged Andrey Grodzovsky
2021-05-11 6:53 ` Christian König
2021-05-10 16:36 ` [PATCH v6 13/16] drm/amdgpu: Fix hang on device removal Andrey Grodzovsky
2021-05-11 6:54 ` Christian König
2021-05-10 16:36 ` [PATCH v6 14/16] drm/scheduler: Fix hang when sched_entity released Andrey Grodzovsky
2021-05-10 16:36 ` [PATCH v6 15/16] drm/amd/display: Remove superflous drm_mode_config_cleanup Andrey Grodzovsky
2021-05-10 21:38 ` Rodrigo Siqueira
2021-05-10 16:36 ` [PATCH v6 16/16] drm/amdgpu: Verify DMA opearations from device are done Andrey Grodzovsky
2021-05-11 6:56 ` Christian König
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