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From: Daniel Vetter <daniel.vetter@ffwll.ch>
To: Intel Graphics Development <intel-gfx@lists.freedesktop.org>
Cc: David Airlie <airlied@linux.ie>,
	Daniel Vetter <daniel.vetter@ffwll.ch>,
	DRI Development <dri-devel@lists.freedesktop.org>,
	Thomas Zimmermann <tzimmermann@suse.de>,
	Daniel Vetter <daniel.vetter@intel.com>
Subject: [PATCH v4 2/4] drm/shmem-helper: Switch to vmf_insert_pfn
Date: Tue, 13 Jul 2021 22:51:51 +0200	[thread overview]
Message-ID: <20210713205153.1896059-3-daniel.vetter@ffwll.ch> (raw)
In-Reply-To: <20210713205153.1896059-1-daniel.vetter@ffwll.ch>

We want to stop gup, which isn't the case if we use vmf_insert_page
and VM_MIXEDMAP, because that does not set pte_special.

v2: With this shmem gem helpers now definitely need CONFIG_MMU (0day)

v3: add more depends on MMU. For usb drivers this is a bit awkward,
but really it's correct: To be able to provide a contig mapping of
buffers to userspace on !MMU platforms we'd need to use the cma
helpers for these drivers on those platforms. As-is this wont work.

Also not exactly sure why vm_insert_page doesn't go boom, because that
definitely wont fly in practice since the pages are non-contig to
begin with.

Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
---
 drivers/gpu/drm/Kconfig                | 2 +-
 drivers/gpu/drm/drm_gem_shmem_helper.c | 4 ++--
 drivers/gpu/drm/gud/Kconfig            | 2 +-
 drivers/gpu/drm/tiny/Kconfig           | 4 ++--
 drivers/gpu/drm/udl/Kconfig            | 1 +
 5 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index 0d372354c2d0..314eefa39892 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -211,7 +211,7 @@ config DRM_KMS_CMA_HELPER
 
 config DRM_GEM_SHMEM_HELPER
 	bool
-	depends on DRM
+	depends on DRM && MMU
 	help
 	  Choose this if you need the GEM shmem helper functions
 
diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
index d5e6d4568f99..296ab1b7c07f 100644
--- a/drivers/gpu/drm/drm_gem_shmem_helper.c
+++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
@@ -542,7 +542,7 @@ static vm_fault_t drm_gem_shmem_fault(struct vm_fault *vmf)
 	} else {
 		page = shmem->pages[page_offset];
 
-		ret = vmf_insert_page(vma, vmf->address, page);
+		ret = vmf_insert_pfn(vma, vmf->address, page_to_pfn(page));
 	}
 
 	mutex_unlock(&shmem->pages_lock);
@@ -612,7 +612,7 @@ int drm_gem_shmem_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
 		return ret;
 	}
 
-	vma->vm_flags |= VM_MIXEDMAP | VM_DONTEXPAND;
+	vma->vm_flags |= VM_PFNMAP | VM_DONTEXPAND;
 	vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
 	if (shmem->map_wc)
 		vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
diff --git a/drivers/gpu/drm/gud/Kconfig b/drivers/gpu/drm/gud/Kconfig
index 1c8601bf4d91..9c1e61f9eec3 100644
--- a/drivers/gpu/drm/gud/Kconfig
+++ b/drivers/gpu/drm/gud/Kconfig
@@ -2,7 +2,7 @@
 
 config DRM_GUD
 	tristate "GUD USB Display"
-	depends on DRM && USB
+	depends on DRM && USB && MMU
 	select LZ4_COMPRESS
 	select DRM_KMS_HELPER
 	select DRM_GEM_SHMEM_HELPER
diff --git a/drivers/gpu/drm/tiny/Kconfig b/drivers/gpu/drm/tiny/Kconfig
index 5593128eeff9..c11fb5be7d09 100644
--- a/drivers/gpu/drm/tiny/Kconfig
+++ b/drivers/gpu/drm/tiny/Kconfig
@@ -44,7 +44,7 @@ config DRM_CIRRUS_QEMU
 
 config DRM_GM12U320
 	tristate "GM12U320 driver for USB projectors"
-	depends on DRM && USB
+	depends on DRM && USB && MMU
 	select DRM_KMS_HELPER
 	select DRM_GEM_SHMEM_HELPER
 	help
@@ -53,7 +53,7 @@ config DRM_GM12U320
 
 config DRM_SIMPLEDRM
 	tristate "Simple framebuffer driver"
-	depends on DRM
+	depends on DRM && MMU
 	select DRM_GEM_SHMEM_HELPER
 	select DRM_KMS_HELPER
 	help
diff --git a/drivers/gpu/drm/udl/Kconfig b/drivers/gpu/drm/udl/Kconfig
index 1f497d8f1ae5..c744175c6992 100644
--- a/drivers/gpu/drm/udl/Kconfig
+++ b/drivers/gpu/drm/udl/Kconfig
@@ -4,6 +4,7 @@ config DRM_UDL
 	depends on DRM
 	depends on USB
 	depends on USB_ARCH_HAS_HCD
+	depends on MMU
 	select DRM_GEM_SHMEM_HELPER
 	select DRM_KMS_HELPER
 	help
-- 
2.32.0


WARNING: multiple messages have this Message-ID (diff)
From: Daniel Vetter <daniel.vetter@ffwll.ch>
To: Intel Graphics Development <intel-gfx@lists.freedesktop.org>
Cc: David Airlie <airlied@linux.ie>,
	Daniel Vetter <daniel.vetter@ffwll.ch>,
	Maxime Ripard <mripard@kernel.org>,
	DRI Development <dri-devel@lists.freedesktop.org>,
	Thomas Zimmermann <tzimmermann@suse.de>,
	Daniel Vetter <daniel.vetter@intel.com>
Subject: [Intel-gfx] [PATCH v4 2/4] drm/shmem-helper: Switch to vmf_insert_pfn
Date: Tue, 13 Jul 2021 22:51:51 +0200	[thread overview]
Message-ID: <20210713205153.1896059-3-daniel.vetter@ffwll.ch> (raw)
In-Reply-To: <20210713205153.1896059-1-daniel.vetter@ffwll.ch>

We want to stop gup, which isn't the case if we use vmf_insert_page
and VM_MIXEDMAP, because that does not set pte_special.

v2: With this shmem gem helpers now definitely need CONFIG_MMU (0day)

v3: add more depends on MMU. For usb drivers this is a bit awkward,
but really it's correct: To be able to provide a contig mapping of
buffers to userspace on !MMU platforms we'd need to use the cma
helpers for these drivers on those platforms. As-is this wont work.

Also not exactly sure why vm_insert_page doesn't go boom, because that
definitely wont fly in practice since the pages are non-contig to
begin with.

Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
---
 drivers/gpu/drm/Kconfig                | 2 +-
 drivers/gpu/drm/drm_gem_shmem_helper.c | 4 ++--
 drivers/gpu/drm/gud/Kconfig            | 2 +-
 drivers/gpu/drm/tiny/Kconfig           | 4 ++--
 drivers/gpu/drm/udl/Kconfig            | 1 +
 5 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index 0d372354c2d0..314eefa39892 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -211,7 +211,7 @@ config DRM_KMS_CMA_HELPER
 
 config DRM_GEM_SHMEM_HELPER
 	bool
-	depends on DRM
+	depends on DRM && MMU
 	help
 	  Choose this if you need the GEM shmem helper functions
 
diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
index d5e6d4568f99..296ab1b7c07f 100644
--- a/drivers/gpu/drm/drm_gem_shmem_helper.c
+++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
@@ -542,7 +542,7 @@ static vm_fault_t drm_gem_shmem_fault(struct vm_fault *vmf)
 	} else {
 		page = shmem->pages[page_offset];
 
-		ret = vmf_insert_page(vma, vmf->address, page);
+		ret = vmf_insert_pfn(vma, vmf->address, page_to_pfn(page));
 	}
 
 	mutex_unlock(&shmem->pages_lock);
@@ -612,7 +612,7 @@ int drm_gem_shmem_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
 		return ret;
 	}
 
-	vma->vm_flags |= VM_MIXEDMAP | VM_DONTEXPAND;
+	vma->vm_flags |= VM_PFNMAP | VM_DONTEXPAND;
 	vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
 	if (shmem->map_wc)
 		vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
diff --git a/drivers/gpu/drm/gud/Kconfig b/drivers/gpu/drm/gud/Kconfig
index 1c8601bf4d91..9c1e61f9eec3 100644
--- a/drivers/gpu/drm/gud/Kconfig
+++ b/drivers/gpu/drm/gud/Kconfig
@@ -2,7 +2,7 @@
 
 config DRM_GUD
 	tristate "GUD USB Display"
-	depends on DRM && USB
+	depends on DRM && USB && MMU
 	select LZ4_COMPRESS
 	select DRM_KMS_HELPER
 	select DRM_GEM_SHMEM_HELPER
diff --git a/drivers/gpu/drm/tiny/Kconfig b/drivers/gpu/drm/tiny/Kconfig
index 5593128eeff9..c11fb5be7d09 100644
--- a/drivers/gpu/drm/tiny/Kconfig
+++ b/drivers/gpu/drm/tiny/Kconfig
@@ -44,7 +44,7 @@ config DRM_CIRRUS_QEMU
 
 config DRM_GM12U320
 	tristate "GM12U320 driver for USB projectors"
-	depends on DRM && USB
+	depends on DRM && USB && MMU
 	select DRM_KMS_HELPER
 	select DRM_GEM_SHMEM_HELPER
 	help
@@ -53,7 +53,7 @@ config DRM_GM12U320
 
 config DRM_SIMPLEDRM
 	tristate "Simple framebuffer driver"
-	depends on DRM
+	depends on DRM && MMU
 	select DRM_GEM_SHMEM_HELPER
 	select DRM_KMS_HELPER
 	help
diff --git a/drivers/gpu/drm/udl/Kconfig b/drivers/gpu/drm/udl/Kconfig
index 1f497d8f1ae5..c744175c6992 100644
--- a/drivers/gpu/drm/udl/Kconfig
+++ b/drivers/gpu/drm/udl/Kconfig
@@ -4,6 +4,7 @@ config DRM_UDL
 	depends on DRM
 	depends on USB
 	depends on USB_ARCH_HAS_HCD
+	depends on MMU
 	select DRM_GEM_SHMEM_HELPER
 	select DRM_KMS_HELPER
 	help
-- 
2.32.0

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

  parent reply	other threads:[~2021-07-13 20:52 UTC|newest]

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-13 20:51 [PATCH v4 0/4] shmem helpers for vgem Daniel Vetter
2021-07-13 20:51 ` [Intel-gfx] " Daniel Vetter
2021-07-13 20:51 ` [PATCH v4 1/4] dma-buf: Require VM_PFNMAP vma for mmap Daniel Vetter
2021-07-13 20:51   ` [Intel-gfx] " Daniel Vetter
2021-07-13 20:51   ` Daniel Vetter
2021-07-23 18:45   ` Thomas Zimmermann
2021-07-23 18:45     ` [Intel-gfx] " Thomas Zimmermann
2021-07-23 18:45     ` Thomas Zimmermann
2021-07-13 20:51 ` Daniel Vetter [this message]
2021-07-13 20:51   ` [Intel-gfx] [PATCH v4 2/4] drm/shmem-helper: Switch to vmf_insert_pfn Daniel Vetter
2021-07-22 18:22   ` Thomas Zimmermann
2021-07-22 18:22     ` [Intel-gfx] " Thomas Zimmermann
2021-07-23  7:32     ` Daniel Vetter
2021-07-23  7:32       ` [Intel-gfx] " Daniel Vetter
2021-08-12 13:05     ` Daniel Vetter
2021-08-12 13:05       ` [Intel-gfx] " Daniel Vetter
2021-07-13 20:51 ` [PATCH v4 3/4] drm/shmem-helpers: Allocate wc pages on x86 Daniel Vetter
2021-07-13 20:51   ` [Intel-gfx] " Daniel Vetter
2021-07-14 11:54   ` Christian König
2021-07-14 11:54     ` [Intel-gfx] " Christian König
2021-07-14 12:48     ` Daniel Vetter
2021-07-14 12:48       ` [Intel-gfx] " Daniel Vetter
2021-07-14 12:58       ` Christian König
2021-07-14 12:58         ` [Intel-gfx] " Christian König
2021-07-14 16:16         ` Daniel Vetter
2021-07-14 16:16           ` [Intel-gfx] " Daniel Vetter
2021-07-22 18:40   ` Thomas Zimmermann
2021-07-22 18:40     ` [Intel-gfx] " Thomas Zimmermann
2021-07-23  7:36     ` Daniel Vetter
2021-07-23  7:36       ` [Intel-gfx] " Daniel Vetter
2021-07-23  8:02       ` Christian König
2021-07-23  8:02         ` [Intel-gfx] " Christian König
2021-07-23  8:34         ` Daniel Vetter
2021-07-23  8:34           ` [Intel-gfx] " Daniel Vetter
2021-08-05 18:40       ` Thomas Zimmermann
2021-08-05 18:40         ` [Intel-gfx] " Thomas Zimmermann
2021-07-13 20:51 ` [PATCH v4 4/4] drm/vgem: use shmem helpers Daniel Vetter
2021-07-13 20:51   ` [Intel-gfx] " Daniel Vetter
2021-07-14 12:45   ` [PATCH] " Daniel Vetter
2021-07-14 12:45     ` [Intel-gfx] " Daniel Vetter
2021-07-22 18:50   ` [PATCH v4 4/4] " Thomas Zimmermann
2021-07-22 18:50     ` [Intel-gfx] " Thomas Zimmermann
2021-07-23  7:38     ` Daniel Vetter
2021-07-23  7:38       ` [Intel-gfx] " Daniel Vetter
2021-07-13 23:43 ` [Intel-gfx] ✗ Fi.CI.CHECKPATCH: warning for shmem helpers for vgem (rev6) Patchwork
2021-07-14  0:11 ` [Intel-gfx] ✗ Fi.CI.BAT: failure " Patchwork
2021-07-16 13:29 ` [Intel-gfx] ✗ Fi.CI.CHECKPATCH: warning for shmem helpers for vgem (rev8) Patchwork
2021-07-16 13:58 ` [Intel-gfx] ✓ Fi.CI.BAT: success " Patchwork
2021-07-16 16:43 ` [Intel-gfx] ✗ Fi.CI.IGT: failure " Patchwork

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