From: Thomas Zimmermann <tzimmermann@suse.de> To: javierm@redhat.com, daniel@ffwll.ch, deller@gmx.de, airlied@linux.ie, maarten.lankhorst@linux.intel.com Cc: dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, Thomas Zimmermann <tzimmermann@suse.de> Subject: [PATCH v3 3/5] fbdev: Refactor implementation of page_mkwrite Date: Tue, 26 Apr 2022 14:03:57 +0200 [thread overview] Message-ID: <20220426120359.17437-4-tzimmermann@suse.de> (raw) In-Reply-To: <20220426120359.17437-1-tzimmermann@suse.de> Refactor the page-write handler for deferred I/O. Drivers use the function to let fbdev track written pages of mmap'ed framebuffer memory. v3: * keep locking within track-pages function for readability (Sam) v2: * don't export the helper until we have an external caller Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Javier Martinez Canillas <javierm@redhat.com> --- drivers/video/fbdev/core/fb_defio.c | 53 +++++++++++++++++++++-------- 1 file changed, 38 insertions(+), 15 deletions(-) diff --git a/drivers/video/fbdev/core/fb_defio.c b/drivers/video/fbdev/core/fb_defio.c index 1bdef5c241f7..3f9bb4725119 100644 --- a/drivers/video/fbdev/core/fb_defio.c +++ b/drivers/video/fbdev/core/fb_defio.c @@ -143,26 +143,17 @@ int fb_deferred_io_fsync(struct file *file, loff_t start, loff_t end, int datasy } EXPORT_SYMBOL_GPL(fb_deferred_io_fsync); -/* vm_ops->page_mkwrite handler */ -static vm_fault_t fb_deferred_io_mkwrite(struct vm_fault *vmf) +/* + * Adds a page to the dirty list. Call this from struct + * vm_operations_struct.page_mkwrite. + */ +static vm_fault_t fb_deferred_io_track_page(struct fb_info *info, unsigned long offset, + struct page *page) { - struct page *page = vmf->page; - struct fb_info *info = vmf->vma->vm_private_data; struct fb_deferred_io *fbdefio = info->fbdefio; struct fb_deferred_io_pageref *pageref; - unsigned long offset; vm_fault_t ret; - offset = (vmf->address - vmf->vma->vm_start); - - /* this is a callback we get when userspace first tries to - write to the page. we schedule a workqueue. that workqueue - will eventually mkclean the touched pages and execute the - deferred framebuffer IO. then if userspace touches a page - again, we repeat the same scheme */ - - file_update_time(vmf->vma->vm_file); - /* protect against the workqueue changing the page list */ mutex_lock(&fbdefio->lock); @@ -197,6 +188,38 @@ static vm_fault_t fb_deferred_io_mkwrite(struct vm_fault *vmf) return ret; } +/* + * fb_deferred_io_page_mkwrite - Mark a page as written for deferred I/O + * @fb_info: The fbdev info structure + * @vmf: The VM fault + * + * This is a callback we get when userspace first tries to + * write to the page. We schedule a workqueue. That workqueue + * will eventually mkclean the touched pages and execute the + * deferred framebuffer IO. Then if userspace touches a page + * again, we repeat the same scheme. + * + * Returns: + * VM_FAULT_LOCKED on success, or a VM_FAULT error otherwise. + */ +static vm_fault_t fb_deferred_io_page_mkwrite(struct fb_info *info, struct vm_fault *vmf) +{ + unsigned long offset = vmf->address - vmf->vma->vm_start; + struct page *page = vmf->page; + + file_update_time(vmf->vma->vm_file); + + return fb_deferred_io_track_page(info, offset, page); +} + +/* vm_ops->page_mkwrite handler */ +static vm_fault_t fb_deferred_io_mkwrite(struct vm_fault *vmf) +{ + struct fb_info *info = vmf->vma->vm_private_data; + + return fb_deferred_io_page_mkwrite(info, vmf); +} + static const struct vm_operations_struct fb_deferred_io_vm_ops = { .fault = fb_deferred_io_fault, .page_mkwrite = fb_deferred_io_mkwrite, -- 2.36.0
WARNING: multiple messages have this Message-ID (diff)
From: Thomas Zimmermann <tzimmermann@suse.de> To: javierm@redhat.com, daniel@ffwll.ch, deller@gmx.de, airlied@linux.ie, maarten.lankhorst@linux.intel.com Cc: linux-fbdev@vger.kernel.org, Thomas Zimmermann <tzimmermann@suse.de>, dri-devel@lists.freedesktop.org Subject: [PATCH v3 3/5] fbdev: Refactor implementation of page_mkwrite Date: Tue, 26 Apr 2022 14:03:57 +0200 [thread overview] Message-ID: <20220426120359.17437-4-tzimmermann@suse.de> (raw) In-Reply-To: <20220426120359.17437-1-tzimmermann@suse.de> Refactor the page-write handler for deferred I/O. Drivers use the function to let fbdev track written pages of mmap'ed framebuffer memory. v3: * keep locking within track-pages function for readability (Sam) v2: * don't export the helper until we have an external caller Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Javier Martinez Canillas <javierm@redhat.com> --- drivers/video/fbdev/core/fb_defio.c | 53 +++++++++++++++++++++-------- 1 file changed, 38 insertions(+), 15 deletions(-) diff --git a/drivers/video/fbdev/core/fb_defio.c b/drivers/video/fbdev/core/fb_defio.c index 1bdef5c241f7..3f9bb4725119 100644 --- a/drivers/video/fbdev/core/fb_defio.c +++ b/drivers/video/fbdev/core/fb_defio.c @@ -143,26 +143,17 @@ int fb_deferred_io_fsync(struct file *file, loff_t start, loff_t end, int datasy } EXPORT_SYMBOL_GPL(fb_deferred_io_fsync); -/* vm_ops->page_mkwrite handler */ -static vm_fault_t fb_deferred_io_mkwrite(struct vm_fault *vmf) +/* + * Adds a page to the dirty list. Call this from struct + * vm_operations_struct.page_mkwrite. + */ +static vm_fault_t fb_deferred_io_track_page(struct fb_info *info, unsigned long offset, + struct page *page) { - struct page *page = vmf->page; - struct fb_info *info = vmf->vma->vm_private_data; struct fb_deferred_io *fbdefio = info->fbdefio; struct fb_deferred_io_pageref *pageref; - unsigned long offset; vm_fault_t ret; - offset = (vmf->address - vmf->vma->vm_start); - - /* this is a callback we get when userspace first tries to - write to the page. we schedule a workqueue. that workqueue - will eventually mkclean the touched pages and execute the - deferred framebuffer IO. then if userspace touches a page - again, we repeat the same scheme */ - - file_update_time(vmf->vma->vm_file); - /* protect against the workqueue changing the page list */ mutex_lock(&fbdefio->lock); @@ -197,6 +188,38 @@ static vm_fault_t fb_deferred_io_mkwrite(struct vm_fault *vmf) return ret; } +/* + * fb_deferred_io_page_mkwrite - Mark a page as written for deferred I/O + * @fb_info: The fbdev info structure + * @vmf: The VM fault + * + * This is a callback we get when userspace first tries to + * write to the page. We schedule a workqueue. That workqueue + * will eventually mkclean the touched pages and execute the + * deferred framebuffer IO. Then if userspace touches a page + * again, we repeat the same scheme. + * + * Returns: + * VM_FAULT_LOCKED on success, or a VM_FAULT error otherwise. + */ +static vm_fault_t fb_deferred_io_page_mkwrite(struct fb_info *info, struct vm_fault *vmf) +{ + unsigned long offset = vmf->address - vmf->vma->vm_start; + struct page *page = vmf->page; + + file_update_time(vmf->vma->vm_file); + + return fb_deferred_io_track_page(info, offset, page); +} + +/* vm_ops->page_mkwrite handler */ +static vm_fault_t fb_deferred_io_mkwrite(struct vm_fault *vmf) +{ + struct fb_info *info = vmf->vma->vm_private_data; + + return fb_deferred_io_page_mkwrite(info, vmf); +} + static const struct vm_operations_struct fb_deferred_io_vm_ops = { .fault = fb_deferred_io_fault, .page_mkwrite = fb_deferred_io_mkwrite, -- 2.36.0
next prev parent reply other threads:[~2022-04-26 12:04 UTC|newest] Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-04-26 12:03 [PATCH v3 0/5] fbdev: Decouple deferred I/O from struct page Thomas Zimmermann 2022-04-26 12:03 ` Thomas Zimmermann 2022-04-26 12:03 ` [PATCH v3 1/5] fbdev: Put mmap for deferred I/O into drivers Thomas Zimmermann 2022-04-26 12:03 ` Thomas Zimmermann 2022-04-26 12:03 ` [PATCH v3 2/5] fbdev: Track deferred-I/O pages in pageref struct Thomas Zimmermann 2022-04-26 12:03 ` Thomas Zimmermann 2022-04-26 12:03 ` Thomas Zimmermann [this message] 2022-04-26 12:03 ` [PATCH v3 3/5] fbdev: Refactor implementation of page_mkwrite Thomas Zimmermann 2022-04-26 12:03 ` [PATCH v3 4/5] fbdev: Rename pagelist to pagereflist for deferred I/O Thomas Zimmermann 2022-04-26 12:03 ` Thomas Zimmermann 2022-04-29 7:21 ` Javier Martinez Canillas 2022-04-29 7:27 ` Thomas Zimmermann 2022-04-29 7:38 ` Javier Martinez Canillas 2022-04-26 12:03 ` [PATCH v3 5/5] fbdev: Use pageref offset for deferred-I/O writeback Thomas Zimmermann 2022-04-26 12:03 ` Thomas Zimmermann 2022-04-29 7:34 ` Javier Martinez Canillas 2022-04-26 12:05 ` [PATCH v3 0/5] fbdev: Decouple deferred I/O from struct page Thomas Zimmermann 2022-04-26 12:05 ` Thomas Zimmermann 2022-04-28 2:00 [PATCH v3 1/5] fbdev: Put mmap for deferred I/O into drivers kernel test robot 2022-04-28 9:43 ` Dan Carpenter 2022-04-28 9:43 ` Dan Carpenter 2022-04-28 9:43 ` Dan Carpenter
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