A driver to let userspace turn memfd regions into dma-bufs.
Use case: Allows qemu create dmabufs for the vga framebuffer or virtio-gpu ressources. Then they can be passed around to display those guest things on the host. To spice client for classic full framebuffer display, and hopefully some day to wayland server for seamless guest window display.
qemu test branch: https://git.kraxel.org/cgit/qemu/log/?h=sirius/udmabuf
Cc: David Airlie airlied@linux.ie Cc: Tomeu Vizoso tomeu.vizoso@collabora.com Cc: Laurent Pinchart laurent.pinchart@ideasonboard.com Cc: Daniel Vetter daniel@ffwll.ch Signed-off-by: Gerd Hoffmann kraxel@redhat.com --- Documentation/ioctl/ioctl-number.txt | 1 + include/uapi/linux/udmabuf.h | 33 +++ drivers/dma-buf/udmabuf.c | 287 ++++++++++++++++++++++ tools/testing/selftests/drivers/dma-buf/udmabuf.c | 96 ++++++++ MAINTAINERS | 8 + drivers/dma-buf/Kconfig | 8 + drivers/dma-buf/Makefile | 1 + tools/testing/selftests/drivers/dma-buf/Makefile | 5 + 8 files changed, 439 insertions(+) create mode 100644 include/uapi/linux/udmabuf.h create mode 100644 drivers/dma-buf/udmabuf.c create mode 100644 tools/testing/selftests/drivers/dma-buf/udmabuf.c create mode 100644 tools/testing/selftests/drivers/dma-buf/Makefile
diff --git a/Documentation/ioctl/ioctl-number.txt b/Documentation/ioctl/ioctl-number.txt index 480c8609dc..6636dea476 100644 --- a/Documentation/ioctl/ioctl-number.txt +++ b/Documentation/ioctl/ioctl-number.txt @@ -271,6 +271,7 @@ Code Seq#(hex) Include File Comments 't' 90-91 linux/toshiba.h toshiba and toshiba_acpi SMM 'u' 00-1F linux/smb_fs.h gone 'u' 20-3F linux/uvcvideo.h USB video class host driver +'u' 40-4f linux/udmabuf.h userspace dma-buf misc device 'v' 00-1F linux/ext2_fs.h conflict! 'v' 00-1F linux/fs.h conflict! 'v' 00-0F linux/sonypi.h conflict! diff --git a/include/uapi/linux/udmabuf.h b/include/uapi/linux/udmabuf.h new file mode 100644 index 0000000000..46b6532ed8 --- /dev/null +++ b/include/uapi/linux/udmabuf.h @@ -0,0 +1,33 @@ +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ +#ifndef _UAPI_LINUX_UDMABUF_H +#define _UAPI_LINUX_UDMABUF_H + +#include <linux/types.h> +#include <linux/ioctl.h> + +#define UDMABUF_FLAGS_CLOEXEC 0x01 + +struct udmabuf_create { + __u32 memfd; + __u32 flags; + __u64 offset; + __u64 size; +}; + +struct udmabuf_create_item { + __u32 memfd; + __u32 __pad; + __u64 offset; + __u64 size; +}; + +struct udmabuf_create_list { + __u32 flags; + __u32 count; + struct udmabuf_create_item list[]; +}; + +#define UDMABUF_CREATE _IOW('u', 0x42, struct udmabuf_create) +#define UDMABUF_CREATE_LIST _IOW('u', 0x43, struct udmabuf_create_list) + +#endif /* _UAPI_LINUX_UDMABUF_H */ diff --git a/drivers/dma-buf/udmabuf.c b/drivers/dma-buf/udmabuf.c new file mode 100644 index 0000000000..8e24204526 --- /dev/null +++ b/drivers/dma-buf/udmabuf.c @@ -0,0 +1,287 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <linux/init.h> +#include <linux/module.h> +#include <linux/device.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/miscdevice.h> +#include <linux/dma-buf.h> +#include <linux/highmem.h> +#include <linux/cred.h> +#include <linux/shmem_fs.h> +#include <linux/memfd.h> + +#include <uapi/linux/udmabuf.h> + +struct udmabuf { + u32 pagecount; + struct page **pages; +}; + +static int udmabuf_vm_fault(struct vm_fault *vmf) +{ + struct vm_area_struct *vma = vmf->vma; + struct udmabuf *ubuf = vma->vm_private_data; + + if (WARN_ON(vmf->pgoff >= ubuf->pagecount)) + return VM_FAULT_SIGBUS; + + vmf->page = ubuf->pages[vmf->pgoff]; + get_page(vmf->page); + return 0; +} + +static const struct vm_operations_struct udmabuf_vm_ops = { + .fault = udmabuf_vm_fault, +}; + +static int mmap_udmabuf(struct dma_buf *buf, struct vm_area_struct *vma) +{ + struct udmabuf *ubuf = buf->priv; + + if ((vma->vm_flags & (VM_SHARED | VM_MAYSHARE)) == 0) + return -EINVAL; + + vma->vm_ops = &udmabuf_vm_ops; + vma->vm_private_data = ubuf; + return 0; +} + +static struct sg_table *map_udmabuf(struct dma_buf_attachment *at, + enum dma_data_direction direction) +{ + struct udmabuf *ubuf = at->dmabuf->priv; + struct sg_table *sg; + + sg = kzalloc(sizeof(*sg), GFP_KERNEL); + if (!sg) + goto err1; + if (sg_alloc_table_from_pages(sg, ubuf->pages, ubuf->pagecount, + 0, ubuf->pagecount << PAGE_SHIFT, + GFP_KERNEL) < 0) + goto err2; + if (!dma_map_sg(at->dev, sg->sgl, sg->nents, direction)) + goto err3; + + return sg; + +err3: + sg_free_table(sg); +err2: + kfree(sg); +err1: + return ERR_PTR(-ENOMEM); +} + +static void unmap_udmabuf(struct dma_buf_attachment *at, + struct sg_table *sg, + enum dma_data_direction direction) +{ + sg_free_table(sg); + kfree(sg); +} + +static void release_udmabuf(struct dma_buf *buf) +{ + struct udmabuf *ubuf = buf->priv; + pgoff_t pg; + + for (pg = 0; pg < ubuf->pagecount; pg++) + put_page(ubuf->pages[pg]); + kfree(ubuf->pages); + kfree(ubuf); +} + +static void *kmap_udmabuf(struct dma_buf *buf, unsigned long page_num) +{ + struct udmabuf *ubuf = buf->priv; + struct page *page = ubuf->pages[page_num]; + + return kmap(page); +} + +static void kunmap_udmabuf(struct dma_buf *buf, unsigned long page_num, + void *vaddr) +{ + kunmap(vaddr); +} + +static struct dma_buf_ops udmabuf_ops = { + .map_dma_buf = map_udmabuf, + .unmap_dma_buf = unmap_udmabuf, + .release = release_udmabuf, + .map = kmap_udmabuf, + .unmap = kunmap_udmabuf, + .mmap = mmap_udmabuf, +}; + +#define SEALS_WANTED (F_SEAL_SHRINK) +#define SEALS_DENIED (F_SEAL_WRITE) + +static long udmabuf_create(struct udmabuf_create_list *head, + struct udmabuf_create_item *list) +{ + DEFINE_DMA_BUF_EXPORT_INFO(exp_info); + struct file *memfd = NULL; + struct udmabuf *ubuf; + struct dma_buf *buf; + pgoff_t pgoff, pgcnt, pgidx, pgbuf; + struct page *page; + int seals, ret = -EINVAL; + u32 i, flags; + + ubuf = kzalloc(sizeof(struct udmabuf), GFP_KERNEL); + if (!ubuf) + return -ENOMEM; + + for (i = 0; i < head->count; i++) { + if (!IS_ALIGNED(list[i].offset, PAGE_SIZE)) + goto err_free_ubuf; + if (!IS_ALIGNED(list[i].size, PAGE_SIZE)) + goto err_free_ubuf; + ubuf->pagecount += list[i].size >> PAGE_SHIFT; + } + ubuf->pages = kmalloc_array(ubuf->pagecount, sizeof(struct page *), + GFP_KERNEL); + if (!ubuf->pages) { + ret = -ENOMEM; + goto err_free_ubuf; + } + + pgbuf = 0; + for (i = 0; i < head->count; i++) { + memfd = fget(list[i].memfd); + if (!memfd) + goto err_put_pages; + if (!shmem_mapping(file_inode(memfd)->i_mapping)) + goto err_put_pages; + seals = memfd_fcntl(memfd, F_GET_SEALS, 0); + if (seals == -EINVAL || + (seals & SEALS_WANTED) != SEALS_WANTED || + (seals & SEALS_DENIED) != 0) + goto err_put_pages; + pgoff = list[i].offset >> PAGE_SHIFT; + pgcnt = list[i].size >> PAGE_SHIFT; + for (pgidx = 0; pgidx < pgcnt; pgidx++) { + page = shmem_read_mapping_page( + file_inode(memfd)->i_mapping, pgoff + pgidx); + if (IS_ERR(page)) { + ret = PTR_ERR(page); + goto err_put_pages; + } + ubuf->pages[pgbuf++] = page; + } + fput(memfd); + } + memfd = NULL; + + exp_info.ops = &udmabuf_ops; + exp_info.size = ubuf->pagecount << PAGE_SHIFT; + exp_info.priv = ubuf; + + buf = dma_buf_export(&exp_info); + if (IS_ERR(buf)) { + ret = PTR_ERR(buf); + goto err_put_pages; + } + + flags = 0; + if (head->flags & UDMABUF_FLAGS_CLOEXEC) + flags |= O_CLOEXEC; + return dma_buf_fd(buf, flags); + +err_put_pages: + while (pgbuf > 0) + put_page(ubuf->pages[--pgbuf]); +err_free_ubuf: + fput(memfd); + kfree(ubuf->pages); + kfree(ubuf); + return ret; +} + +static long udmabuf_ioctl_create(struct file *filp, unsigned long arg) +{ + struct udmabuf_create create; + struct udmabuf_create_list head; + struct udmabuf_create_item list; + + if (copy_from_user(&create, (void __user *)arg, + sizeof(struct udmabuf_create))) + return -EFAULT; + + head.flags = create.flags; + head.count = 1; + list.memfd = create.memfd; + list.offset = create.offset; + list.size = create.size; + + return udmabuf_create(&head, &list); +} + +static long udmabuf_ioctl_create_list(struct file *filp, unsigned long arg) +{ + struct udmabuf_create_list head; + struct udmabuf_create_item *list; + int ret = -EINVAL; + u32 lsize; + + if (copy_from_user(&head, (void __user *)arg, sizeof(head))) + return -EFAULT; + if (head.count > 1024) + return -EINVAL; + lsize = sizeof(struct udmabuf_create_item) * head.count; + list = memdup_user((void __user *)(arg + sizeof(head)), lsize); + if (IS_ERR(list)) + return PTR_ERR(list); + + ret = udmabuf_create(&head, list); + kfree(list); + return ret; +} + +static long udmabuf_ioctl(struct file *filp, unsigned int ioctl, + unsigned long arg) +{ + long ret; + + switch (ioctl) { + case UDMABUF_CREATE: + ret = udmabuf_ioctl_create(filp, arg); + break; + case UDMABUF_CREATE_LIST: + ret = udmabuf_ioctl_create_list(filp, arg); + break; + default: + ret = -EINVAL; + break; + } + return ret; +} + +static const struct file_operations udmabuf_fops = { + .owner = THIS_MODULE, + .unlocked_ioctl = udmabuf_ioctl, +}; + +static struct miscdevice udmabuf_misc = { + .minor = MISC_DYNAMIC_MINOR, + .name = "udmabuf", + .fops = &udmabuf_fops, +}; + +static int __init udmabuf_dev_init(void) +{ + return misc_register(&udmabuf_misc); +} + +static void __exit udmabuf_dev_exit(void) +{ + misc_deregister(&udmabuf_misc); +} + +module_init(udmabuf_dev_init) +module_exit(udmabuf_dev_exit) + +MODULE_AUTHOR("Gerd Hoffmann kraxel@redhat.com"); +MODULE_LICENSE("GPL v2"); diff --git a/tools/testing/selftests/drivers/dma-buf/udmabuf.c b/tools/testing/selftests/drivers/dma-buf/udmabuf.c new file mode 100644 index 0000000000..376b1d6730 --- /dev/null +++ b/tools/testing/selftests/drivers/dma-buf/udmabuf.c @@ -0,0 +1,96 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <string.h> +#include <errno.h> +#include <fcntl.h> +#include <malloc.h> + +#include <sys/ioctl.h> +#include <sys/syscall.h> +#include <linux/memfd.h> +#include <linux/udmabuf.h> + +#define TEST_PREFIX "drivers/dma-buf/udmabuf" +#define NUM_PAGES 4 + +static int memfd_create(const char *name, unsigned int flags) +{ + return syscall(__NR_memfd_create, name, flags); +} + +int main(int argc, char *argv[]) +{ + struct udmabuf_create create; + int devfd, memfd, buf, ret; + off_t size; + void *mem; + + devfd = open("/dev/udmabuf", O_RDWR); + if (devfd < 0) { + printf("%s: [skip,no-udmabuf]\n", TEST_PREFIX); + exit(77); + } + + memfd = memfd_create("udmabuf-test", MFD_CLOEXEC); + if (memfd < 0) { + printf("%s: [skip,no-memfd]\n", TEST_PREFIX); + exit(77); + } + + size = getpagesize() * NUM_PAGES; + ret = ftruncate(memfd, size); + if (ret == -1) { + printf("%s: [FAIL,memfd-truncate]\n", TEST_PREFIX); + exit(1); + } + + memset(&create, 0, sizeof(create)); + + /* should fail (offset not page aligned) */ + create.memfd = memfd; + create.offset = getpagesize()/2; + create.size = getpagesize(); + buf = ioctl(devfd, UDMABUF_CREATE, &create); + if (buf >= 0) { + printf("%s: [FAIL,test-1]\n", TEST_PREFIX); + exit(1); + } + + /* should fail (size not multiple of page) */ + create.memfd = memfd; + create.offset = 0; + create.size = getpagesize()/2; + buf = ioctl(devfd, UDMABUF_CREATE, &create); + if (buf >= 0) { + printf("%s: [FAIL,test-2]\n", TEST_PREFIX); + exit(1); + } + + /* should fail (not memfd) */ + create.memfd = 0; /* stdin */ + create.offset = 0; + create.size = size; + buf = ioctl(devfd, UDMABUF_CREATE, &create); + if (buf >= 0) { + printf("%s: [FAIL,test-3]\n", TEST_PREFIX); + exit(1); + } + + /* should work */ + create.memfd = memfd; + create.offset = 0; + create.size = size; + buf = ioctl(devfd, UDMABUF_CREATE, &create); + if (buf < 0) { + printf("%s: [FAIL,test-4]\n", TEST_PREFIX); + exit(1); + } + + fprintf(stderr, "%s: ok\n", TEST_PREFIX); + close(buf); + close(memfd); + close(devfd); + return 0; +} diff --git a/MAINTAINERS b/MAINTAINERS index 07d1576fc7..a8e1bb3bc3 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -14638,6 +14638,14 @@ S: Maintained F: Documentation/filesystems/udf.txt F: fs/udf/
+UDMABUF DRIVER +M: Gerd Hoffmann kraxel@redhat.com +L: dri-devel@lists.freedesktop.org +S: Maintained +F: drivers/dma-buf/udmabuf.c +F: include/uapi/linux/udmabuf.h +F: tools/testing/selftests/drivers/dma-buf/udmabuf.c + UDRAW TABLET M: Bastien Nocera hadess@hadess.net L: linux-input@vger.kernel.org diff --git a/drivers/dma-buf/Kconfig b/drivers/dma-buf/Kconfig index ed3b785bae..338129eb12 100644 --- a/drivers/dma-buf/Kconfig +++ b/drivers/dma-buf/Kconfig @@ -30,4 +30,12 @@ config SW_SYNC WARNING: improper use of this can result in deadlocking kernel drivers from userspace. Intended for test and debug only.
+config UDMABUF + bool "userspace dmabuf misc driver" + default n + depends on DMA_SHARED_BUFFER + help + A driver to let userspace turn memfd regions into dma-bufs. + Qemu can use this to create host dmabufs for guest framebuffers. + endmenu diff --git a/drivers/dma-buf/Makefile b/drivers/dma-buf/Makefile index c33bf88631..0913a6ccab 100644 --- a/drivers/dma-buf/Makefile +++ b/drivers/dma-buf/Makefile @@ -1,3 +1,4 @@ obj-y := dma-buf.o dma-fence.o dma-fence-array.o reservation.o seqno-fence.o obj-$(CONFIG_SYNC_FILE) += sync_file.o obj-$(CONFIG_SW_SYNC) += sw_sync.o sync_debug.o +obj-$(CONFIG_UDMABUF) += udmabuf.o diff --git a/tools/testing/selftests/drivers/dma-buf/Makefile b/tools/testing/selftests/drivers/dma-buf/Makefile new file mode 100644 index 0000000000..4154c3d7aa --- /dev/null +++ b/tools/testing/selftests/drivers/dma-buf/Makefile @@ -0,0 +1,5 @@ +CFLAGS += -I../../../../../usr/include/ + +TEST_GEN_PROGS := udmabuf + +include ../../lib.mk
On Tue, Jul 03, 2018 at 09:53:58AM +0200, Gerd Hoffmann wrote:
A driver to let userspace turn memfd regions into dma-bufs.
Use case: Allows qemu create dmabufs for the vga framebuffer or virtio-gpu ressources. Then they can be passed around to display those guest things on the host. To spice client for classic full framebuffer display, and hopefully some day to wayland server for seamless guest window display.
qemu test branch: https://git.kraxel.org/cgit/qemu/log/?h=sirius/udmabuf
Cc: David Airlie airlied@linux.ie Cc: Tomeu Vizoso tomeu.vizoso@collabora.com Cc: Laurent Pinchart laurent.pinchart@ideasonboard.com Cc: Daniel Vetter daniel@ffwll.ch Signed-off-by: Gerd Hoffmann kraxel@redhat.com
I think some ack for a 2nd use-case, like virtio-wl or whatever would be really cool. To give us some assurance that this is generically useful. Plus an ack from dma-buf folks (nag them on irc, you don't have them on Cc here). Then this is imo good to go.
I assume you'll push it to drm-misc, like all the other dma-buf stuff? -Daniel
Documentation/ioctl/ioctl-number.txt | 1 + include/uapi/linux/udmabuf.h | 33 +++ drivers/dma-buf/udmabuf.c | 287 ++++++++++++++++++++++ tools/testing/selftests/drivers/dma-buf/udmabuf.c | 96 ++++++++ MAINTAINERS | 8 + drivers/dma-buf/Kconfig | 8 + drivers/dma-buf/Makefile | 1 + tools/testing/selftests/drivers/dma-buf/Makefile | 5 + 8 files changed, 439 insertions(+) create mode 100644 include/uapi/linux/udmabuf.h create mode 100644 drivers/dma-buf/udmabuf.c create mode 100644 tools/testing/selftests/drivers/dma-buf/udmabuf.c create mode 100644 tools/testing/selftests/drivers/dma-buf/Makefile
diff --git a/Documentation/ioctl/ioctl-number.txt b/Documentation/ioctl/ioctl-number.txt index 480c8609dc..6636dea476 100644 --- a/Documentation/ioctl/ioctl-number.txt +++ b/Documentation/ioctl/ioctl-number.txt @@ -271,6 +271,7 @@ Code Seq#(hex) Include File Comments 't' 90-91 linux/toshiba.h toshiba and toshiba_acpi SMM 'u' 00-1F linux/smb_fs.h gone 'u' 20-3F linux/uvcvideo.h USB video class host driver +'u' 40-4f linux/udmabuf.h userspace dma-buf misc device 'v' 00-1F linux/ext2_fs.h conflict! 'v' 00-1F linux/fs.h conflict! 'v' 00-0F linux/sonypi.h conflict! diff --git a/include/uapi/linux/udmabuf.h b/include/uapi/linux/udmabuf.h new file mode 100644 index 0000000000..46b6532ed8 --- /dev/null +++ b/include/uapi/linux/udmabuf.h @@ -0,0 +1,33 @@ +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ +#ifndef _UAPI_LINUX_UDMABUF_H +#define _UAPI_LINUX_UDMABUF_H
+#include <linux/types.h> +#include <linux/ioctl.h>
+#define UDMABUF_FLAGS_CLOEXEC 0x01
+struct udmabuf_create {
- __u32 memfd;
- __u32 flags;
- __u64 offset;
- __u64 size;
+};
+struct udmabuf_create_item {
- __u32 memfd;
- __u32 __pad;
- __u64 offset;
- __u64 size;
+};
+struct udmabuf_create_list {
- __u32 flags;
- __u32 count;
- struct udmabuf_create_item list[];
+};
+#define UDMABUF_CREATE _IOW('u', 0x42, struct udmabuf_create) +#define UDMABUF_CREATE_LIST _IOW('u', 0x43, struct udmabuf_create_list)
+#endif /* _UAPI_LINUX_UDMABUF_H */ diff --git a/drivers/dma-buf/udmabuf.c b/drivers/dma-buf/udmabuf.c new file mode 100644 index 0000000000..8e24204526 --- /dev/null +++ b/drivers/dma-buf/udmabuf.c @@ -0,0 +1,287 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <linux/init.h> +#include <linux/module.h> +#include <linux/device.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/miscdevice.h> +#include <linux/dma-buf.h> +#include <linux/highmem.h> +#include <linux/cred.h> +#include <linux/shmem_fs.h> +#include <linux/memfd.h>
+#include <uapi/linux/udmabuf.h>
+struct udmabuf {
- u32 pagecount;
- struct page **pages;
+};
+static int udmabuf_vm_fault(struct vm_fault *vmf) +{
- struct vm_area_struct *vma = vmf->vma;
- struct udmabuf *ubuf = vma->vm_private_data;
- if (WARN_ON(vmf->pgoff >= ubuf->pagecount))
return VM_FAULT_SIGBUS;- vmf->page = ubuf->pages[vmf->pgoff];
- get_page(vmf->page);
- return 0;
+}
+static const struct vm_operations_struct udmabuf_vm_ops = {
- .fault = udmabuf_vm_fault,
+};
+static int mmap_udmabuf(struct dma_buf *buf, struct vm_area_struct *vma) +{
- struct udmabuf *ubuf = buf->priv;
- if ((vma->vm_flags & (VM_SHARED | VM_MAYSHARE)) == 0)
return -EINVAL;- vma->vm_ops = &udmabuf_vm_ops;
- vma->vm_private_data = ubuf;
- return 0;
+}
+static struct sg_table *map_udmabuf(struct dma_buf_attachment *at,
enum dma_data_direction direction)+{
- struct udmabuf *ubuf = at->dmabuf->priv;
- struct sg_table *sg;
- sg = kzalloc(sizeof(*sg), GFP_KERNEL);
- if (!sg)
goto err1;- if (sg_alloc_table_from_pages(sg, ubuf->pages, ubuf->pagecount,
0, ubuf->pagecount << PAGE_SHIFT,GFP_KERNEL) < 0)goto err2;- if (!dma_map_sg(at->dev, sg->sgl, sg->nents, direction))
goto err3;- return sg;
+err3:
- sg_free_table(sg);
+err2:
- kfree(sg);
+err1:
- return ERR_PTR(-ENOMEM);
+}
+static void unmap_udmabuf(struct dma_buf_attachment *at,
struct sg_table *sg,enum dma_data_direction direction)+{
- sg_free_table(sg);
- kfree(sg);
+}
+static void release_udmabuf(struct dma_buf *buf) +{
- struct udmabuf *ubuf = buf->priv;
- pgoff_t pg;
- for (pg = 0; pg < ubuf->pagecount; pg++)
put_page(ubuf->pages[pg]);- kfree(ubuf->pages);
- kfree(ubuf);
+}
+static void *kmap_udmabuf(struct dma_buf *buf, unsigned long page_num) +{
- struct udmabuf *ubuf = buf->priv;
- struct page *page = ubuf->pages[page_num];
- return kmap(page);
+}
+static void kunmap_udmabuf(struct dma_buf *buf, unsigned long page_num,
void *vaddr)+{
- kunmap(vaddr);
+}
+static struct dma_buf_ops udmabuf_ops = {
- .map_dma_buf = map_udmabuf,
- .unmap_dma_buf = unmap_udmabuf,
- .release = release_udmabuf,
- .map = kmap_udmabuf,
- .unmap = kunmap_udmabuf,
- .mmap = mmap_udmabuf,
+};
+#define SEALS_WANTED (F_SEAL_SHRINK) +#define SEALS_DENIED (F_SEAL_WRITE)
+static long udmabuf_create(struct udmabuf_create_list *head,
struct udmabuf_create_item *list)+{
- DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
- struct file *memfd = NULL;
- struct udmabuf *ubuf;
- struct dma_buf *buf;
- pgoff_t pgoff, pgcnt, pgidx, pgbuf;
- struct page *page;
- int seals, ret = -EINVAL;
- u32 i, flags;
- ubuf = kzalloc(sizeof(struct udmabuf), GFP_KERNEL);
- if (!ubuf)
return -ENOMEM;- for (i = 0; i < head->count; i++) {
if (!IS_ALIGNED(list[i].offset, PAGE_SIZE))goto err_free_ubuf;if (!IS_ALIGNED(list[i].size, PAGE_SIZE))goto err_free_ubuf;ubuf->pagecount += list[i].size >> PAGE_SHIFT;- }
- ubuf->pages = kmalloc_array(ubuf->pagecount, sizeof(struct page *),
GFP_KERNEL);- if (!ubuf->pages) {
ret = -ENOMEM;goto err_free_ubuf;- }
- pgbuf = 0;
- for (i = 0; i < head->count; i++) {
memfd = fget(list[i].memfd);if (!memfd)goto err_put_pages;if (!shmem_mapping(file_inode(memfd)->i_mapping))goto err_put_pages;seals = memfd_fcntl(memfd, F_GET_SEALS, 0);if (seals == -EINVAL ||(seals & SEALS_WANTED) != SEALS_WANTED ||(seals & SEALS_DENIED) != 0)goto err_put_pages;pgoff = list[i].offset >> PAGE_SHIFT;pgcnt = list[i].size >> PAGE_SHIFT;for (pgidx = 0; pgidx < pgcnt; pgidx++) {page = shmem_read_mapping_page(file_inode(memfd)->i_mapping, pgoff + pgidx);if (IS_ERR(page)) {ret = PTR_ERR(page);goto err_put_pages;}ubuf->pages[pgbuf++] = page;}fput(memfd);- }
- memfd = NULL;
- exp_info.ops = &udmabuf_ops;
- exp_info.size = ubuf->pagecount << PAGE_SHIFT;
- exp_info.priv = ubuf;
- buf = dma_buf_export(&exp_info);
- if (IS_ERR(buf)) {
ret = PTR_ERR(buf);goto err_put_pages;- }
- flags = 0;
- if (head->flags & UDMABUF_FLAGS_CLOEXEC)
flags |= O_CLOEXEC;- return dma_buf_fd(buf, flags);
+err_put_pages:
- while (pgbuf > 0)
put_page(ubuf->pages[--pgbuf]);+err_free_ubuf:
- fput(memfd);
- kfree(ubuf->pages);
- kfree(ubuf);
- return ret;
+}
+static long udmabuf_ioctl_create(struct file *filp, unsigned long arg) +{
- struct udmabuf_create create;
- struct udmabuf_create_list head;
- struct udmabuf_create_item list;
- if (copy_from_user(&create, (void __user *)arg,
sizeof(struct udmabuf_create)))return -EFAULT;- head.flags = create.flags;
- head.count = 1;
- list.memfd = create.memfd;
- list.offset = create.offset;
- list.size = create.size;
- return udmabuf_create(&head, &list);
+}
+static long udmabuf_ioctl_create_list(struct file *filp, unsigned long arg) +{
- struct udmabuf_create_list head;
- struct udmabuf_create_item *list;
- int ret = -EINVAL;
- u32 lsize;
- if (copy_from_user(&head, (void __user *)arg, sizeof(head)))
return -EFAULT;- if (head.count > 1024)
return -EINVAL;- lsize = sizeof(struct udmabuf_create_item) * head.count;
- list = memdup_user((void __user *)(arg + sizeof(head)), lsize);
- if (IS_ERR(list))
return PTR_ERR(list);- ret = udmabuf_create(&head, list);
- kfree(list);
- return ret;
+}
+static long udmabuf_ioctl(struct file *filp, unsigned int ioctl,
unsigned long arg)+{
- long ret;
- switch (ioctl) {
- case UDMABUF_CREATE:
ret = udmabuf_ioctl_create(filp, arg);break;- case UDMABUF_CREATE_LIST:
ret = udmabuf_ioctl_create_list(filp, arg);break;- default:
ret = -EINVAL;break;- }
- return ret;
+}
+static const struct file_operations udmabuf_fops = {
- .owner = THIS_MODULE,
- .unlocked_ioctl = udmabuf_ioctl,
+};
+static struct miscdevice udmabuf_misc = {
- .minor = MISC_DYNAMIC_MINOR,
- .name = "udmabuf",
- .fops = &udmabuf_fops,
+};
+static int __init udmabuf_dev_init(void) +{
- return misc_register(&udmabuf_misc);
+}
+static void __exit udmabuf_dev_exit(void) +{
- misc_deregister(&udmabuf_misc);
+}
+module_init(udmabuf_dev_init) +module_exit(udmabuf_dev_exit)
+MODULE_AUTHOR("Gerd Hoffmann kraxel@redhat.com"); +MODULE_LICENSE("GPL v2"); diff --git a/tools/testing/selftests/drivers/dma-buf/udmabuf.c b/tools/testing/selftests/drivers/dma-buf/udmabuf.c new file mode 100644 index 0000000000..376b1d6730 --- /dev/null +++ b/tools/testing/selftests/drivers/dma-buf/udmabuf.c @@ -0,0 +1,96 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <string.h> +#include <errno.h> +#include <fcntl.h> +#include <malloc.h>
+#include <sys/ioctl.h> +#include <sys/syscall.h> +#include <linux/memfd.h> +#include <linux/udmabuf.h>
+#define TEST_PREFIX "drivers/dma-buf/udmabuf" +#define NUM_PAGES 4
+static int memfd_create(const char *name, unsigned int flags) +{
- return syscall(__NR_memfd_create, name, flags);
+}
+int main(int argc, char *argv[]) +{
- struct udmabuf_create create;
- int devfd, memfd, buf, ret;
- off_t size;
- void *mem;
- devfd = open("/dev/udmabuf", O_RDWR);
- if (devfd < 0) {
printf("%s: [skip,no-udmabuf]\n", TEST_PREFIX);exit(77);- }
- memfd = memfd_create("udmabuf-test", MFD_CLOEXEC);
- if (memfd < 0) {
printf("%s: [skip,no-memfd]\n", TEST_PREFIX);exit(77);- }
- size = getpagesize() * NUM_PAGES;
- ret = ftruncate(memfd, size);
- if (ret == -1) {
printf("%s: [FAIL,memfd-truncate]\n", TEST_PREFIX);exit(1);- }
- memset(&create, 0, sizeof(create));
- /* should fail (offset not page aligned) */
- create.memfd = memfd;
- create.offset = getpagesize()/2;
- create.size = getpagesize();
- buf = ioctl(devfd, UDMABUF_CREATE, &create);
- if (buf >= 0) {
printf("%s: [FAIL,test-1]\n", TEST_PREFIX);exit(1);- }
- /* should fail (size not multiple of page) */
- create.memfd = memfd;
- create.offset = 0;
- create.size = getpagesize()/2;
- buf = ioctl(devfd, UDMABUF_CREATE, &create);
- if (buf >= 0) {
printf("%s: [FAIL,test-2]\n", TEST_PREFIX);exit(1);- }
- /* should fail (not memfd) */
- create.memfd = 0; /* stdin */
- create.offset = 0;
- create.size = size;
- buf = ioctl(devfd, UDMABUF_CREATE, &create);
- if (buf >= 0) {
printf("%s: [FAIL,test-3]\n", TEST_PREFIX);exit(1);- }
- /* should work */
- create.memfd = memfd;
- create.offset = 0;
- create.size = size;
- buf = ioctl(devfd, UDMABUF_CREATE, &create);
- if (buf < 0) {
printf("%s: [FAIL,test-4]\n", TEST_PREFIX);exit(1);- }
- fprintf(stderr, "%s: ok\n", TEST_PREFIX);
- close(buf);
- close(memfd);
- close(devfd);
- return 0;
+} diff --git a/MAINTAINERS b/MAINTAINERS index 07d1576fc7..a8e1bb3bc3 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -14638,6 +14638,14 @@ S: Maintained F: Documentation/filesystems/udf.txt F: fs/udf/ +UDMABUF DRIVER +M: Gerd Hoffmann kraxel@redhat.com +L: dri-devel@lists.freedesktop.org +S: Maintained +F: drivers/dma-buf/udmabuf.c +F: include/uapi/linux/udmabuf.h +F: tools/testing/selftests/drivers/dma-buf/udmabuf.c
UDRAW TABLET M: Bastien Nocera hadess@hadess.net L: linux-input@vger.kernel.org diff --git a/drivers/dma-buf/Kconfig b/drivers/dma-buf/Kconfig index ed3b785bae..338129eb12 100644 --- a/drivers/dma-buf/Kconfig +++ b/drivers/dma-buf/Kconfig @@ -30,4 +30,12 @@ config SW_SYNC WARNING: improper use of this can result in deadlocking kernel drivers from userspace. Intended for test and debug only. +config UDMABUF
- bool "userspace dmabuf misc driver"
- default n
- depends on DMA_SHARED_BUFFER
- help
A driver to let userspace turn memfd regions into dma-bufs.Qemu can use this to create host dmabufs for guest framebuffers.endmenu diff --git a/drivers/dma-buf/Makefile b/drivers/dma-buf/Makefile index c33bf88631..0913a6ccab 100644 --- a/drivers/dma-buf/Makefile +++ b/drivers/dma-buf/Makefile @@ -1,3 +1,4 @@ obj-y := dma-buf.o dma-fence.o dma-fence-array.o reservation.o seqno-fence.o obj-$(CONFIG_SYNC_FILE) += sync_file.o obj-$(CONFIG_SW_SYNC) += sw_sync.o sync_debug.o +obj-$(CONFIG_UDMABUF) += udmabuf.o diff --git a/tools/testing/selftests/drivers/dma-buf/Makefile b/tools/testing/selftests/drivers/dma-buf/Makefile new file mode 100644 index 0000000000..4154c3d7aa --- /dev/null +++ b/tools/testing/selftests/drivers/dma-buf/Makefile @@ -0,0 +1,5 @@ +CFLAGS += -I../../../../../usr/include/
+TEST_GEN_PROGS := udmabuf
+include ../../lib.mk
2.9.3
On Tue, Jul 03, 2018 at 10:37:57AM +0200, Daniel Vetter wrote:
On Tue, Jul 03, 2018 at 09:53:58AM +0200, Gerd Hoffmann wrote:
A driver to let userspace turn memfd regions into dma-bufs.
Use case: Allows qemu create dmabufs for the vga framebuffer or virtio-gpu ressources. Then they can be passed around to display those guest things on the host. To spice client for classic full framebuffer display, and hopefully some day to wayland server for seamless guest window display.
qemu test branch: https://git.kraxel.org/cgit/qemu/log/?h=sirius/udmabuf
Cc: David Airlie airlied@linux.ie Cc: Tomeu Vizoso tomeu.vizoso@collabora.com Cc: Laurent Pinchart laurent.pinchart@ideasonboard.com Cc: Daniel Vetter daniel@ffwll.ch Signed-off-by: Gerd Hoffmann kraxel@redhat.com
I think some ack for a 2nd use-case, like virtio-wl or whatever would be really cool. To give us some assurance that this is generically useful.
Tomeu? Laurent?
Plus an ack from dma-buf folks (nag them on irc, you don't have them on Cc here).
Hmm, does MAINTAINERS need an update then? Maintainer and mailing lists listed in the "DMA BUFFER SHARING FRAMEWORK" entry are on Cc.
Who should be Cc'ed?
Then this is imo good to go.
I assume you'll push it to drm-misc, like all the other dma-buf stuff?
Can do that, sure, after collecting the acks ...
thanks, Gerd
On Wed, Jul 04, 2018 at 07:53:38AM +0200, Gerd Hoffmann wrote:
On Tue, Jul 03, 2018 at 10:37:57AM +0200, Daniel Vetter wrote:
On Tue, Jul 03, 2018 at 09:53:58AM +0200, Gerd Hoffmann wrote:
A driver to let userspace turn memfd regions into dma-bufs.
Use case: Allows qemu create dmabufs for the vga framebuffer or virtio-gpu ressources. Then they can be passed around to display those guest things on the host. To spice client for classic full framebuffer display, and hopefully some day to wayland server for seamless guest window display.
qemu test branch: https://git.kraxel.org/cgit/qemu/log/?h=sirius/udmabuf
Cc: David Airlie airlied@linux.ie Cc: Tomeu Vizoso tomeu.vizoso@collabora.com Cc: Laurent Pinchart laurent.pinchart@ideasonboard.com Cc: Daniel Vetter daniel@ffwll.ch Signed-off-by: Gerd Hoffmann kraxel@redhat.com
I think some ack for a 2nd use-case, like virtio-wl or whatever would be really cool. To give us some assurance that this is generically useful.
Tomeu? Laurent?
Plus an ack from dma-buf folks (nag them on irc, you don't have them on Cc here).
Hmm, does MAINTAINERS need an update then? Maintainer and mailing lists listed in the "DMA BUFFER SHARING FRAMEWORK" entry are on Cc.
Yeah, maintainers entry with you as maintainer plus dri-devel as mailing list plus drm-misc as repo would be good. Just grep for drm-misc.git for tons of examples.
Who should be Cc'ed?
dim add-missing-cc ftw :-)
Cheers, Daniel
Then this is imo good to go.
I assume you'll push it to drm-misc, like all the other dma-buf stuff?
Can do that, sure, after collecting the acks ...
thanks, Gerd
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Hi,
Hmm, does MAINTAINERS need an update then? Maintainer and mailing lists listed in the "DMA BUFFER SHARING FRAMEWORK" entry are on Cc.
Yeah, maintainers entry with you as maintainer plus dri-devel as mailing list plus drm-misc as repo would be good. Just grep for drm-misc.git for tons of examples.
There is an *existing* entry covering drivers/dma-buf/, and I've dropped udmabuf.c into that directory, so I've assumed get_maintainers.pl picks up all relevant dma-buf folks ...
Covering udmabuf.c maintainance is a different issue. I could just add myself to the existing entry, or create a new one specifically for udmabuf.
Who should be Cc'ed?
dim add-missing-cc ftw :-)
That just uses get_maintainer.pl according to the docs, so that wouldn't change things as that is wired up as sendemail.cccmd already. Except that dim would probably add the list of people to the commit message.
cheers, Gerd
On Wed, Jul 04, 2018 at 10:58:25AM +0200, Gerd Hoffmann wrote:
Hi,
Hmm, does MAINTAINERS need an update then? Maintainer and mailing lists listed in the "DMA BUFFER SHARING FRAMEWORK" entry are on Cc.
Yeah, maintainers entry with you as maintainer plus dri-devel as mailing list plus drm-misc as repo would be good. Just grep for drm-misc.git for tons of examples.
There is an *existing* entry covering drivers/dma-buf/, and I've dropped udmabuf.c into that directory, so I've assumed get_maintainers.pl picks up all relevant dma-buf folks ...
Covering udmabuf.c maintainance is a different issue. I could just add myself to the existing entry, or create a new one specifically for udmabuf.
That's what I meant, do a more specific entry to add yourself just for udmabuf.
Who should be Cc'ed?
dim add-missing-cc ftw :-)
That just uses get_maintainer.pl according to the docs, so that wouldn't change things as that is wired up as sendemail.cccmd already. Except that dim would probably add the list of people to the commit message.
Ah right, I totally missed that you have more on the mail's Cc: than on the patch. I never do that, so always miss them :-) -Daniel
Hi,
Covering udmabuf.c maintainance is a different issue. I could just add myself to the existing entry, or create a new one specifically for udmabuf.
That's what I meant, do a more specific entry to add yourself just for udmabuf.
Ok. Back from summer vacation, finally found the time to continue working on this. Entry added, rebased to 4.19-rc1, v7 comes in a moment. Please review & ack.
thanks, Gerd
linaro-mm-sig@lists.linaro.org
-
Daniel Vetter -
Gerd Hoffmann