Hi all,
I finally figured out why CI is unhappy on some machines, we've lost WC mode on the vgem side!
Test-with: 20210527140732.5762-1-daniel.vetter@ffwll.ch
Cheers, Daniel
Daniel Vetter (4): drm/gem-shmem-helper: Export drm_gem_shmem_funcs drm/shmem-helper: Switch to vmf_insert_pfn drm/shmem-helper: Align to page size in dumb_create drm/vgem: use shmem helpers
drivers/gpu/drm/Kconfig | 3 +- drivers/gpu/drm/drm_gem_shmem_helper.c | 11 +- drivers/gpu/drm/vgem/vgem_drv.c | 346 ++----------------------- include/drm/drm_gem_shmem_helper.h | 1 + 4 files changed, 25 insertions(+), 336 deletions(-)
Drivers which need to overwrite the drm_driver->gem_create_object hook need this. Specifically vgem, which wants wc mode, but everything else is fine as-is.
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/drm_gem_shmem_helper.c | 3 ++- include/drm/drm_gem_shmem_helper.h | 1 + 2 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c index 6d625cee7a6a..4439004e62fe 100644 --- a/drivers/gpu/drm/drm_gem_shmem_helper.c +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c @@ -24,7 +24,7 @@ * allocated using anonymous pageable memory. */
-static const struct drm_gem_object_funcs drm_gem_shmem_funcs = { +const struct drm_gem_object_funcs drm_gem_shmem_funcs = { .free = drm_gem_shmem_free_object, .print_info = drm_gem_shmem_print_info, .pin = drm_gem_shmem_pin, @@ -34,6 +34,7 @@ static const struct drm_gem_object_funcs drm_gem_shmem_funcs = { .vunmap = drm_gem_shmem_vunmap, .mmap = drm_gem_shmem_mmap, }; +EXPORT_SYMBOL(drm_gem_shmem_funcs);
static struct drm_gem_shmem_object * __drm_gem_shmem_create(struct drm_device *dev, size_t size, bool private) diff --git a/include/drm/drm_gem_shmem_helper.h b/include/drm/drm_gem_shmem_helper.h index 434328d8a0d9..b29667f2b8a3 100644 --- a/include/drm/drm_gem_shmem_helper.h +++ b/include/drm/drm_gem_shmem_helper.h @@ -106,6 +106,7 @@ struct drm_gem_shmem_object { #define to_drm_gem_shmem_obj(obj) \ container_of(obj, struct drm_gem_shmem_object, base)
+extern const struct drm_gem_object_funcs drm_gem_shmem_funcs; struct drm_gem_shmem_object *drm_gem_shmem_create(struct drm_device *dev, size_t size); void drm_gem_shmem_free_object(struct drm_gem_object *obj);
Hi
Am 03.06.21 um 17:03 schrieb Daniel Vetter:
Drivers which need to overwrite the drm_driver->gem_create_object hook need this. Specifically vgem, which wants wc mode, but everything else is fine as-is.
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/drm_gem_shmem_helper.c | 3 ++- include/drm/drm_gem_shmem_helper.h | 1 + 2 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c index 6d625cee7a6a..4439004e62fe 100644 --- a/drivers/gpu/drm/drm_gem_shmem_helper.c +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c @@ -24,7 +24,7 @@
- allocated using anonymous pageable memory.
*/
-static const struct drm_gem_object_funcs drm_gem_shmem_funcs = { +const struct drm_gem_object_funcs drm_gem_shmem_funcs = { .free = drm_gem_shmem_free_object, .print_info = drm_gem_shmem_print_info, .pin = drm_gem_shmem_pin, @@ -34,6 +34,7 @@ static const struct drm_gem_object_funcs drm_gem_shmem_funcs = { .vunmap = drm_gem_shmem_vunmap, .mmap = drm_gem_shmem_mmap, }; +EXPORT_SYMBOL(drm_gem_shmem_funcs);
No that's not needed. If you leave out the funcs pointer in your gem_create_object, __drm_gem_shmem_create() will set this default for you. [1] So please drop this patch.
Best regards Thomas
[1] https://elixir.bootlin.com/linux/v5.12/source/drivers/gpu/drm/drm_gem_shmem_...
static struct drm_gem_shmem_object * __drm_gem_shmem_create(struct drm_device *dev, size_t size, bool private) diff --git a/include/drm/drm_gem_shmem_helper.h b/include/drm/drm_gem_shmem_helper.h index 434328d8a0d9..b29667f2b8a3 100644 --- a/include/drm/drm_gem_shmem_helper.h +++ b/include/drm/drm_gem_shmem_helper.h @@ -106,6 +106,7 @@ struct drm_gem_shmem_object { #define to_drm_gem_shmem_obj(obj) \ container_of(obj, struct drm_gem_shmem_object, base)
+extern const struct drm_gem_object_funcs drm_gem_shmem_funcs; struct drm_gem_shmem_object *drm_gem_shmem_create(struct drm_device *dev, size_t size); void drm_gem_shmem_free_object(struct drm_gem_object *obj);
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)
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 ++-- 2 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig index 56a55a6e6239..9c21527b791f 100644 --- a/drivers/gpu/drm/Kconfig +++ b/drivers/gpu/drm/Kconfig @@ -206,7 +206,7 @@ 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 4439004e62fe..32f1d7601ec6 100644 --- a/drivers/gpu/drm/drm_gem_shmem_helper.c +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c @@ -543,7 +543,7 @@ 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); @@ -613,7 +613,7 @@ 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);
Hi Daniel,
I love your patch! Yet something to improve:
[auto build test ERROR on drm-intel/for-linux-next] [also build test ERROR on drm-tip/drm-tip drm-exynos/exynos-drm-next tegra-drm/drm/tegra/for-next linus/master v5.13-rc4 next-20210603] [cannot apply to drm/drm-next] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch]
url: https://github.com/0day-ci/linux/commits/Daniel-Vetter/shmem-helpers-for-igt... base: git://anongit.freedesktop.org/drm-intel for-linux-next config: h8300-randconfig-r021-20210603 (attached as .config) compiler: h8300-linux-gcc (GCC) 9.3.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://github.com/0day-ci/linux/commit/5ce1f8f44bf2a1a96bb1a56ef34453d95814... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Daniel-Vetter/shmem-helpers-for-igt/20210603-230602 git checkout 5ce1f8f44bf2a1a96bb1a56ef34453d958142b45 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=h8300
If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot lkp@intel.com
All errors (new ones prefixed by >>):
h8300-linux-ld: section .init.text LMA [000000000059b760,00000000005de3d5] overlaps section .text LMA [0000000000000158,000000000171c08b] h8300-linux-ld: section .data VMA [0000000000400000,000000000059b75f] overlaps section .text VMA [0000000000000158,000000000171c08b] h8300-linux-ld: drivers/gpu/drm/drm_gem_shmem_helper.o: in function `.Llt5':
drm_gem_shmem_helper.c:(.text+0x16f): undefined reference to `vmf_insert_pfn'
Kconfig warnings: (for reference only) WARNING: unmet direct dependencies detected for DRM_GEM_SHMEM_HELPER Depends on HAS_IOMEM && DRM && MMU Selected by - DRM_VKMS && HAS_IOMEM && DRM - DRM_UDL && HAS_IOMEM && DRM && USB && USB_ARCH_HAS_HCD - DRM_GM12U320 && HAS_IOMEM && DRM && USB
--- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
shmem helpers seem a bit sloppy here by automatically rounding up when actually creating the buffer, which results in under-reporting of what we actually have. Caught by igt/vgem_basic tests.
Acked-by: Thomas Zimmermann tzimmermann@suse.de 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/drm_gem_shmem_helper.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c index 32f1d7601ec6..2985744b4300 100644 --- a/drivers/gpu/drm/drm_gem_shmem_helper.c +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c @@ -506,13 +506,13 @@ int drm_gem_shmem_dumb_create(struct drm_file *file, struct drm_device *dev,
if (!args->pitch || !args->size) { args->pitch = min_pitch; - args->size = args->pitch * args->height; + args->size = PAGE_ALIGN(args->pitch * args->height); } else { /* ensure sane minimum values */ if (args->pitch < min_pitch) args->pitch = min_pitch; if (args->size < args->pitch * args->height) - args->size = args->pitch * args->height; + args->size = PAGE_ALIGN(args->pitch * args->height); }
shmem = drm_gem_shmem_create_with_handle(file, dev, args->size, &args->handle);
Am 03.06.21 um 17:03 schrieb Daniel Vetter:
shmem helpers seem a bit sloppy here by automatically rounding up when actually creating the buffer, which results in under-reporting of what we actually have. Caught by igt/vgem_basic tests.
Acked-by: Thomas Zimmermann tzimmermann@suse.de 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
Acked-by: Thomas Zimmermann tzimmermann@suse.de
drivers/gpu/drm/drm_gem_shmem_helper.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c index 32f1d7601ec6..2985744b4300 100644 --- a/drivers/gpu/drm/drm_gem_shmem_helper.c +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c @@ -506,13 +506,13 @@ int drm_gem_shmem_dumb_create(struct drm_file *file, struct drm_device *dev,
if (!args->pitch || !args->size) { args->pitch = min_pitch;
args->size = args->pitch * args->height;
args->size = PAGE_ALIGN(args->pitch * args->height);
args->size = args->pitch * args->height;
args->size = PAGE_ALIGN(args->pitch * args->height);}
shmem = drm_gem_shmem_create_with_handle(file, dev, args->size, &args->handle);
Aside from deleting lots of code the real motivation here is to switch the mmap over to VM_PFNMAP, to be more consistent with what real gpu drivers do. They're all VM_PFNMP, which means get_user_pages doesn't work, and even if you try and there's a struct page behind that, touching it and mucking around with its refcount can upset drivers real bad.
v2: Review from Thomas: - sort #include - drop more dead code that I didn't spot somehow
v3: select DRM_GEM_SHMEM_HELPER to make it build (intel-gfx-ci)
v4: I got tricked by 0cf2ef46c6c0 ("drm/shmem-helper: Use cached mappings by default"), and we need WC in vgem because vgem doesn't have explicit begin/end cpu access ioctls.
Also add a comment why exactly vgem has to use wc.
Cc: Thomas Zimmermann tzimmermann@suse.de Acked-by: Thomas Zimmermann tzimmermann@suse.de Cc: John Stultz john.stultz@linaro.org Cc: Sumit Semwal sumit.semwal@linaro.org Cc: "Christian König" christian.koenig@amd.com Signed-off-by: Daniel Vetter daniel.vetter@intel.com Cc: Melissa Wen melissa.srw@gmail.com Cc: Chris Wilson chris@chris-wilson.co.uk --- drivers/gpu/drm/Kconfig | 1 + drivers/gpu/drm/vgem/vgem_drv.c | 346 ++------------------------------ 2 files changed, 17 insertions(+), 330 deletions(-)
diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig index 9c21527b791f..fb38ef7b3206 100644 --- a/drivers/gpu/drm/Kconfig +++ b/drivers/gpu/drm/Kconfig @@ -268,6 +268,7 @@ source "drivers/gpu/drm/kmb/Kconfig" config DRM_VGEM tristate "Virtual GEM provider" depends on DRM + select DRM_GEM_SHMEM_HELPER help Choose this option to get a virtual graphics memory manager, as used by Mesa's software renderer for enhanced performance. diff --git a/drivers/gpu/drm/vgem/vgem_drv.c b/drivers/gpu/drm/vgem/vgem_drv.c index bf38a7e319d1..031e8f026cfb 100644 --- a/drivers/gpu/drm/vgem/vgem_drv.c +++ b/drivers/gpu/drm/vgem/vgem_drv.c @@ -38,6 +38,7 @@
#include <drm/drm_drv.h> #include <drm/drm_file.h> +#include <drm/drm_gem_shmem_helper.h> #include <drm/drm_ioctl.h> #include <drm/drm_managed.h> #include <drm/drm_prime.h> @@ -50,87 +51,11 @@ #define DRIVER_MAJOR 1 #define DRIVER_MINOR 0
-static const struct drm_gem_object_funcs vgem_gem_object_funcs; - static struct vgem_device { struct drm_device drm; struct platform_device *platform; } *vgem_device;
-static void vgem_gem_free_object(struct drm_gem_object *obj) -{ - struct drm_vgem_gem_object *vgem_obj = to_vgem_bo(obj); - - kvfree(vgem_obj->pages); - mutex_destroy(&vgem_obj->pages_lock); - - if (obj->import_attach) - drm_prime_gem_destroy(obj, vgem_obj->table); - - drm_gem_object_release(obj); - kfree(vgem_obj); -} - -static vm_fault_t vgem_gem_fault(struct vm_fault *vmf) -{ - struct vm_area_struct *vma = vmf->vma; - struct drm_vgem_gem_object *obj = vma->vm_private_data; - /* We don't use vmf->pgoff since that has the fake offset */ - unsigned long vaddr = vmf->address; - vm_fault_t ret = VM_FAULT_SIGBUS; - loff_t num_pages; - pgoff_t page_offset; - page_offset = (vaddr - vma->vm_start) >> PAGE_SHIFT; - - num_pages = DIV_ROUND_UP(obj->base.size, PAGE_SIZE); - - if (page_offset >= num_pages) - return VM_FAULT_SIGBUS; - - mutex_lock(&obj->pages_lock); - if (obj->pages) { - get_page(obj->pages[page_offset]); - vmf->page = obj->pages[page_offset]; - ret = 0; - } - mutex_unlock(&obj->pages_lock); - if (ret) { - struct page *page; - - page = shmem_read_mapping_page( - file_inode(obj->base.filp)->i_mapping, - page_offset); - if (!IS_ERR(page)) { - vmf->page = page; - ret = 0; - } else switch (PTR_ERR(page)) { - case -ENOSPC: - case -ENOMEM: - ret = VM_FAULT_OOM; - break; - case -EBUSY: - ret = VM_FAULT_RETRY; - break; - case -EFAULT: - case -EINVAL: - ret = VM_FAULT_SIGBUS; - break; - default: - WARN_ON(PTR_ERR(page)); - ret = VM_FAULT_SIGBUS; - break; - } - - } - return ret; -} - -static const struct vm_operations_struct vgem_gem_vm_ops = { - .fault = vgem_gem_fault, - .open = drm_gem_vm_open, - .close = drm_gem_vm_close, -}; - static int vgem_open(struct drm_device *dev, struct drm_file *file) { struct vgem_file *vfile; @@ -159,266 +84,32 @@ static void vgem_postclose(struct drm_device *dev, struct drm_file *file) kfree(vfile); }
-static struct drm_vgem_gem_object *__vgem_gem_create(struct drm_device *dev, - unsigned long size) -{ - struct drm_vgem_gem_object *obj; - int ret; - - obj = kzalloc(sizeof(*obj), GFP_KERNEL); - if (!obj) - return ERR_PTR(-ENOMEM); - - obj->base.funcs = &vgem_gem_object_funcs; - - ret = drm_gem_object_init(dev, &obj->base, roundup(size, PAGE_SIZE)); - if (ret) { - kfree(obj); - return ERR_PTR(ret); - } - - mutex_init(&obj->pages_lock); - - return obj; -} - -static void __vgem_gem_destroy(struct drm_vgem_gem_object *obj) -{ - drm_gem_object_release(&obj->base); - kfree(obj); -} - -static struct drm_gem_object *vgem_gem_create(struct drm_device *dev, - struct drm_file *file, - unsigned int *handle, - unsigned long size) -{ - struct drm_vgem_gem_object *obj; - int ret; - - obj = __vgem_gem_create(dev, size); - if (IS_ERR(obj)) - return ERR_CAST(obj); - - ret = drm_gem_handle_create(file, &obj->base, handle); - if (ret) { - drm_gem_object_put(&obj->base); - return ERR_PTR(ret); - } - - return &obj->base; -} - -static int vgem_gem_dumb_create(struct drm_file *file, struct drm_device *dev, - struct drm_mode_create_dumb *args) -{ - struct drm_gem_object *gem_object; - u64 pitch, size; - - pitch = args->width * DIV_ROUND_UP(args->bpp, 8); - size = args->height * pitch; - if (size == 0) - return -EINVAL; - - gem_object = vgem_gem_create(dev, file, &args->handle, size); - if (IS_ERR(gem_object)) - return PTR_ERR(gem_object); - - args->size = gem_object->size; - args->pitch = pitch; - - drm_gem_object_put(gem_object); - - DRM_DEBUG("Created object of size %llu\n", args->size); - - return 0; -} - static struct drm_ioctl_desc vgem_ioctls[] = { DRM_IOCTL_DEF_DRV(VGEM_FENCE_ATTACH, vgem_fence_attach_ioctl, DRM_RENDER_ALLOW), DRM_IOCTL_DEF_DRV(VGEM_FENCE_SIGNAL, vgem_fence_signal_ioctl, DRM_RENDER_ALLOW), };
-static int vgem_mmap(struct file *filp, struct vm_area_struct *vma) -{ - unsigned long flags = vma->vm_flags; - int ret; - - ret = drm_gem_mmap(filp, vma); - if (ret) - return ret; - - /* Keep the WC mmaping set by drm_gem_mmap() but our pages - * are ordinary and not special. - */ - vma->vm_flags = flags | VM_DONTEXPAND | VM_DONTDUMP; - return 0; -} - -static const struct file_operations vgem_driver_fops = { - .owner = THIS_MODULE, - .open = drm_open, - .mmap = vgem_mmap, - .poll = drm_poll, - .read = drm_read, - .unlocked_ioctl = drm_ioctl, - .compat_ioctl = drm_compat_ioctl, - .release = drm_release, -}; - -static struct page **vgem_pin_pages(struct drm_vgem_gem_object *bo) -{ - mutex_lock(&bo->pages_lock); - if (bo->pages_pin_count++ == 0) { - struct page **pages; - - pages = drm_gem_get_pages(&bo->base); - if (IS_ERR(pages)) { - bo->pages_pin_count--; - mutex_unlock(&bo->pages_lock); - return pages; - } - - bo->pages = pages; - } - mutex_unlock(&bo->pages_lock); - - return bo->pages; -} - -static void vgem_unpin_pages(struct drm_vgem_gem_object *bo) -{ - mutex_lock(&bo->pages_lock); - if (--bo->pages_pin_count == 0) { - drm_gem_put_pages(&bo->base, bo->pages, true, true); - bo->pages = NULL; - } - mutex_unlock(&bo->pages_lock); -} - -static int vgem_prime_pin(struct drm_gem_object *obj) -{ - struct drm_vgem_gem_object *bo = to_vgem_bo(obj); - long n_pages = obj->size >> PAGE_SHIFT; - struct page **pages; - - pages = vgem_pin_pages(bo); - if (IS_ERR(pages)) - return PTR_ERR(pages); - - /* Flush the object from the CPU cache so that importers can rely - * on coherent indirect access via the exported dma-address. - */ - drm_clflush_pages(pages, n_pages); +DEFINE_DRM_GEM_FOPS(vgem_driver_fops);
- return 0; -} - -static void vgem_prime_unpin(struct drm_gem_object *obj) -{ - struct drm_vgem_gem_object *bo = to_vgem_bo(obj); - - vgem_unpin_pages(bo); -} - -static struct sg_table *vgem_prime_get_sg_table(struct drm_gem_object *obj) -{ - struct drm_vgem_gem_object *bo = to_vgem_bo(obj); - - return drm_prime_pages_to_sg(obj->dev, bo->pages, bo->base.size >> PAGE_SHIFT); -} - -static struct drm_gem_object* vgem_prime_import(struct drm_device *dev, - struct dma_buf *dma_buf) -{ - struct vgem_device *vgem = container_of(dev, typeof(*vgem), drm); - - return drm_gem_prime_import_dev(dev, dma_buf, &vgem->platform->dev); -} - -static struct drm_gem_object *vgem_prime_import_sg_table(struct drm_device *dev, - struct dma_buf_attachment *attach, struct sg_table *sg) +/* + * This just sets wc mode for shmem helpers. vgem doesn't have any begin/end cpu + * access ioctls, there must use coherent memory or dma-buf sharing just wont + * work. + */ +static struct drm_gem_object *vgem_gem_create_object(struct drm_device *dev, size_t size) { - struct drm_vgem_gem_object *obj; - int npages; + struct drm_gem_shmem_object *obj;
- obj = __vgem_gem_create(dev, attach->dmabuf->size); - if (IS_ERR(obj)) - return ERR_CAST(obj); - - npages = PAGE_ALIGN(attach->dmabuf->size) / PAGE_SIZE; + obj = kzalloc(sizeof(*obj), GFP_KERNEL); + if (!obj) + return NULL;
- obj->table = sg; - obj->pages = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL); - if (!obj->pages) { - __vgem_gem_destroy(obj); - return ERR_PTR(-ENOMEM); - } + obj->base.funcs = &drm_gem_shmem_funcs; + obj->map_wc = true;
- obj->pages_pin_count++; /* perma-pinned */ - drm_prime_sg_to_page_array(obj->table, obj->pages, npages); return &obj->base; }
-static int vgem_prime_vmap(struct drm_gem_object *obj, struct dma_buf_map *map) -{ - struct drm_vgem_gem_object *bo = to_vgem_bo(obj); - long n_pages = obj->size >> PAGE_SHIFT; - struct page **pages; - void *vaddr; - - pages = vgem_pin_pages(bo); - if (IS_ERR(pages)) - return PTR_ERR(pages); - - vaddr = vmap(pages, n_pages, 0, pgprot_writecombine(PAGE_KERNEL)); - if (!vaddr) - return -ENOMEM; - dma_buf_map_set_vaddr(map, vaddr); - - return 0; -} - -static void vgem_prime_vunmap(struct drm_gem_object *obj, struct dma_buf_map *map) -{ - struct drm_vgem_gem_object *bo = to_vgem_bo(obj); - - vunmap(map->vaddr); - vgem_unpin_pages(bo); -} - -static int vgem_prime_mmap(struct drm_gem_object *obj, - struct vm_area_struct *vma) -{ - int ret; - - if (obj->size < vma->vm_end - vma->vm_start) - return -EINVAL; - - if (!obj->filp) - return -ENODEV; - - ret = call_mmap(obj->filp, vma); - if (ret) - return ret; - - vma_set_file(vma, obj->filp); - vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; - vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags)); - - return 0; -} - -static const struct drm_gem_object_funcs vgem_gem_object_funcs = { - .free = vgem_gem_free_object, - .pin = vgem_prime_pin, - .unpin = vgem_prime_unpin, - .get_sg_table = vgem_prime_get_sg_table, - .vmap = vgem_prime_vmap, - .vunmap = vgem_prime_vunmap, - .vm_ops = &vgem_gem_vm_ops, -}; - static const struct drm_driver vgem_driver = { .driver_features = DRIVER_GEM | DRIVER_RENDER, .open = vgem_open, @@ -427,13 +118,8 @@ static const struct drm_driver vgem_driver = { .num_ioctls = ARRAY_SIZE(vgem_ioctls), .fops = &vgem_driver_fops,
- .dumb_create = vgem_gem_dumb_create, - - .prime_handle_to_fd = drm_gem_prime_handle_to_fd, - .prime_fd_to_handle = drm_gem_prime_fd_to_handle, - .gem_prime_import = vgem_prime_import, - .gem_prime_import_sg_table = vgem_prime_import_sg_table, - .gem_prime_mmap = vgem_prime_mmap, + DRM_GEM_SHMEM_DRIVER_OPS, + .gem_create_object = vgem_gem_create_object,
.name = DRIVER_NAME, .desc = DRIVER_DESC,
Hi Daniel,
+/*
- This just sets wc mode for shmem helpers. vgem doesn't have any begin/end cpu
- access ioctls, there must use coherent memory or dma-buf sharing just wont
- work.
- */
+static struct drm_gem_object *vgem_gem_create_object(struct drm_device *dev, size_t size) {
- struct drm_vgem_gem_object *obj;
- int npages;
- struct drm_gem_shmem_object *obj;
- obj = __vgem_gem_create(dev, attach->dmabuf->size);
- if (IS_ERR(obj))
return ERR_CAST(obj);- npages = PAGE_ALIGN(attach->dmabuf->size) / PAGE_SIZE;
- obj = kzalloc(sizeof(*obj), GFP_KERNEL);
- if (!obj)
return NULL;
- obj->table = sg;
- obj->pages = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
- if (!obj->pages) {
__vgem_gem_destroy(obj);return ERR_PTR(-ENOMEM);- }
- obj->base.funcs = &drm_gem_shmem_funcs;
- obj->map_wc = true;
- obj->pages_pin_count++; /* perma-pinned */
- drm_prime_sg_to_page_array(obj->table, obj->pages, npages); return &obj->base;
here you are allocating a bigger object than what you are returning, in size. How does it get freed?
Andi
On Thu, Jun 03, 2021 at 09:42:00PM +0300, Andi Shyti wrote:
Hi Daniel,
+/*
- This just sets wc mode for shmem helpers. vgem doesn't have any begin/end cpu
- access ioctls, there must use coherent memory or dma-buf sharing just wont
- work.
- */
+static struct drm_gem_object *vgem_gem_create_object(struct drm_device *dev, size_t size) {
- struct drm_vgem_gem_object *obj;
- int npages;
- struct drm_gem_shmem_object *obj;
- obj = __vgem_gem_create(dev, attach->dmabuf->size);
- if (IS_ERR(obj))
return ERR_CAST(obj);- npages = PAGE_ALIGN(attach->dmabuf->size) / PAGE_SIZE;
- obj = kzalloc(sizeof(*obj), GFP_KERNEL);
- if (!obj)
return NULL;
- obj->table = sg;
- obj->pages = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
- if (!obj->pages) {
__vgem_gem_destroy(obj);return ERR_PTR(-ENOMEM);- }
- obj->base.funcs = &drm_gem_shmem_funcs;
- obj->map_wc = true;
- obj->pages_pin_count++; /* perma-pinned */
- drm_prime_sg_to_page_array(obj->table, obj->pages, npages); return &obj->base;
here you are allocating a bigger object than what you are returning, in size. How does it get freed?
We're using the drm_gem_shmem_helper.c helpers, which set up all the shmem functions for us, including an appropriate free callback. -Daniel
dri-devel@lists.freedesktop.org
-
Andi Shyti -
Daniel Vetter -
Daniel Vetter -
kernel test robot -
Thomas Zimmermann