[Intel-gfx] [PATCH] drm: Turn off Legacy Context Functions
Daniel Vetter
daniel at ffwll.ch
Mon Jun 15 00:25:07 PDT 2015
On Wed, Jun 10, 2015 at 09:05:14AM +0100, Peter Antoine wrote:
> The context functions are not used by the i915 driver and should not
> be used by modeset drivers. These driver functions contain several bugs
> and security holes. This change makes these functions optional can be
> turned on by a setting, they are turned off by default for modeset
> driver with the exception of the Nova driver that may require them with
> an old version of libdrm.
>
> Signed-off-by: Peter Antoine <peter.antoine at intel.com>
> ---
> drivers/gpu/drm/drm_context.c | 48 +++++++++++++++++++++++++++++++++++
> drivers/gpu/drm/drm_drv.c | 13 ++++++----
> drivers/gpu/drm/drm_lock.c | 8 ++++++
> drivers/gpu/drm/nouveau/nouveau_drm.c | 3 ++-
> include/drm/drmP.h | 23 +++++++++--------
> 5 files changed, 78 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_context.c b/drivers/gpu/drm/drm_context.c
> index 9b23525..f3ea657 100644
> --- a/drivers/gpu/drm/drm_context.c
> +++ b/drivers/gpu/drm/drm_context.c
> @@ -53,6 +53,10 @@ struct drm_ctx_list {
> */
> void drm_legacy_ctxbitmap_free(struct drm_device * dev, int ctx_handle)
> {
> + if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
> + drm_core_check_feature(dev, DRIVER_MODESET))
> + return -EINVAL;
Returning a value for a void function makes for an unhappy gcc.
> +
> mutex_lock(&dev->struct_mutex);
> idr_remove(&dev->ctx_idr, ctx_handle);
> mutex_unlock(&dev->struct_mutex);
> @@ -87,6 +91,10 @@ static int drm_legacy_ctxbitmap_next(struct drm_device * dev)
> */
> int drm_legacy_ctxbitmap_init(struct drm_device * dev)
> {
> + if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
> + drm_core_check_feature(dev, DRIVER_MODESET))
Continuation of if conditions should align with the opening ( like this
if (foo && bar &&
continuation)
Thanks, Daniel
> + return -EINVAL;
> +
> idr_init(&dev->ctx_idr);
> return 0;
> }
> @@ -101,6 +109,10 @@ int drm_legacy_ctxbitmap_init(struct drm_device * dev)
> */
> void drm_legacy_ctxbitmap_cleanup(struct drm_device * dev)
> {
> + if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
> + drm_core_check_feature(dev, DRIVER_MODESET))
> + return -EINVAL;
> +
> mutex_lock(&dev->struct_mutex);
> idr_destroy(&dev->ctx_idr);
> mutex_unlock(&dev->struct_mutex);
> @@ -119,6 +131,10 @@ void drm_legacy_ctxbitmap_flush(struct drm_device *dev, struct drm_file *file)
> {
> struct drm_ctx_list *pos, *tmp;
>
> + if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
> + drm_core_check_feature(dev, DRIVER_MODESET))
> + return -EINVAL;
> +
> mutex_lock(&dev->ctxlist_mutex);
>
> list_for_each_entry_safe(pos, tmp, &dev->ctxlist, head) {
> @@ -161,6 +177,10 @@ int drm_legacy_getsareactx(struct drm_device *dev, void *data,
> struct drm_local_map *map;
> struct drm_map_list *_entry;
>
> + if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
> + drm_core_check_feature(dev, DRIVER_MODESET))
> + return -EINVAL;
> +
> mutex_lock(&dev->struct_mutex);
>
> map = idr_find(&dev->ctx_idr, request->ctx_id);
> @@ -205,6 +225,10 @@ int drm_legacy_setsareactx(struct drm_device *dev, void *data,
> struct drm_local_map *map = NULL;
> struct drm_map_list *r_list = NULL;
>
> + if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
> + drm_core_check_feature(dev, DRIVER_MODESET))
> + return -EINVAL;
> +
> mutex_lock(&dev->struct_mutex);
> list_for_each_entry(r_list, &dev->maplist, head) {
> if (r_list->map
> @@ -305,6 +329,10 @@ int drm_legacy_resctx(struct drm_device *dev, void *data,
> struct drm_ctx ctx;
> int i;
>
> + if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
> + drm_core_check_feature(dev, DRIVER_MODESET))
> + return -EINVAL;
> +
> if (res->count >= DRM_RESERVED_CONTEXTS) {
> memset(&ctx, 0, sizeof(ctx));
> for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) {
> @@ -335,6 +363,10 @@ int drm_legacy_addctx(struct drm_device *dev, void *data,
> struct drm_ctx_list *ctx_entry;
> struct drm_ctx *ctx = data;
>
> + if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
> + drm_core_check_feature(dev, DRIVER_MODESET))
> + return -EINVAL;
> +
> ctx->handle = drm_legacy_ctxbitmap_next(dev);
> if (ctx->handle == DRM_KERNEL_CONTEXT) {
> /* Skip kernel's context and get a new one. */
> @@ -378,6 +410,10 @@ int drm_legacy_getctx(struct drm_device *dev, void *data,
> {
> struct drm_ctx *ctx = data;
>
> + if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
> + drm_core_check_feature(dev, DRIVER_MODESET))
> + return -EINVAL;
> +
> /* This is 0, because we don't handle any context flags */
> ctx->flags = 0;
>
> @@ -400,6 +436,10 @@ int drm_legacy_switchctx(struct drm_device *dev, void *data,
> {
> struct drm_ctx *ctx = data;
>
> + if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
> + drm_core_check_feature(dev, DRIVER_MODESET))
> + return -EINVAL;
> +
> DRM_DEBUG("%d\n", ctx->handle);
> return drm_context_switch(dev, dev->last_context, ctx->handle);
> }
> @@ -420,6 +460,10 @@ int drm_legacy_newctx(struct drm_device *dev, void *data,
> {
> struct drm_ctx *ctx = data;
>
> + if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
> + drm_core_check_feature(dev, DRIVER_MODESET))
> + return -EINVAL;
> +
> DRM_DEBUG("%d\n", ctx->handle);
> drm_context_switch_complete(dev, file_priv, ctx->handle);
>
> @@ -442,6 +486,10 @@ int drm_legacy_rmctx(struct drm_device *dev, void *data,
> {
> struct drm_ctx *ctx = data;
>
> + if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
> + drm_core_check_feature(dev, DRIVER_MODESET))
> + return -EINVAL;
> +
> DRM_DEBUG("%d\n", ctx->handle);
> if (ctx->handle != DRM_KERNEL_CONTEXT) {
> if (dev->driver->context_dtor)
> diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
> index 3b3c4f5..e571711 100644
> --- a/drivers/gpu/drm/drm_drv.c
> +++ b/drivers/gpu/drm/drm_drv.c
> @@ -584,11 +584,14 @@ struct drm_device *drm_dev_alloc(struct drm_driver *driver,
> if (drm_ht_create(&dev->map_hash, 12))
> goto err_minors;
>
> - ret = drm_legacy_ctxbitmap_init(dev);
> - if (ret) {
> - DRM_ERROR("Cannot allocate memory for context bitmap.\n");
> - goto err_ht;
> - }
> + if (drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) ||
> + !drm_core_check_feature(dev, DRIVER_MODESET))
> + ret = drm_legacy_ctxbitmap_init(dev);
> + if (ret) {
> + DRM_ERROR(
> + "Cannot allocate memory for context bitmap.\n");
> + goto err_ht;
> + }
>
> if (drm_core_check_feature(dev, DRIVER_GEM)) {
> ret = drm_gem_init(dev);
> diff --git a/drivers/gpu/drm/drm_lock.c b/drivers/gpu/drm/drm_lock.c
> index f861361..e73687e 100644
> --- a/drivers/gpu/drm/drm_lock.c
> +++ b/drivers/gpu/drm/drm_lock.c
> @@ -61,6 +61,10 @@ int drm_legacy_lock(struct drm_device *dev, void *data,
> struct drm_master *master = file_priv->master;
> int ret = 0;
>
> + if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
> + drm_core_check_feature(dev, DRIVER_MODESET))
> + return -EINVAL;
> +
> ++file_priv->lock_count;
>
> if (lock->context == DRM_KERNEL_CONTEXT) {
> @@ -153,6 +157,10 @@ int drm_legacy_unlock(struct drm_device *dev, void *data, struct drm_file *file_
> struct drm_lock *lock = data;
> struct drm_master *master = file_priv->master;
>
> + if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
> + drm_core_check_feature(dev, DRIVER_MODESET))
> + return -EINVAL;
> +
> if (lock->context == DRM_KERNEL_CONTEXT) {
> DRM_ERROR("Process %d using kernel context %d\n",
> task_pid_nr(current), lock->context);
> diff --git a/drivers/gpu/drm/nouveau/nouveau_drm.c b/drivers/gpu/drm/nouveau/nouveau_drm.c
> index 8904933..9624b38 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_drm.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_drm.c
> @@ -941,7 +941,8 @@ static struct drm_driver
> driver_stub = {
> .driver_features =
> DRIVER_USE_AGP |
> - DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME | DRIVER_RENDER,
> + DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME | DRIVER_RENDER |
> + DRIVER_KMS_LEGACY_CONTEXT,
>
> .load = nouveau_drm_load,
> .unload = nouveau_drm_unload,
> diff --git a/include/drm/drmP.h b/include/drm/drmP.h
> index 9fa6366..654ed7c 100644
> --- a/include/drm/drmP.h
> +++ b/include/drm/drmP.h
> @@ -137,17 +137,18 @@ void drm_err(const char *format, ...);
> /*@{*/
>
> /* driver capabilities and requirements mask */
> -#define DRIVER_USE_AGP 0x1
> -#define DRIVER_PCI_DMA 0x8
> -#define DRIVER_SG 0x10
> -#define DRIVER_HAVE_DMA 0x20
> -#define DRIVER_HAVE_IRQ 0x40
> -#define DRIVER_IRQ_SHARED 0x80
> -#define DRIVER_GEM 0x1000
> -#define DRIVER_MODESET 0x2000
> -#define DRIVER_PRIME 0x4000
> -#define DRIVER_RENDER 0x8000
> -#define DRIVER_ATOMIC 0x10000
> +#define DRIVER_USE_AGP 0x1
> +#define DRIVER_PCI_DMA 0x8
> +#define DRIVER_SG 0x10
> +#define DRIVER_HAVE_DMA 0x20
> +#define DRIVER_HAVE_IRQ 0x40
> +#define DRIVER_IRQ_SHARED 0x80
> +#define DRIVER_GEM 0x1000
> +#define DRIVER_MODESET 0x2000
> +#define DRIVER_PRIME 0x4000
> +#define DRIVER_RENDER 0x8000
> +#define DRIVER_ATOMIC 0x10000
> +#define DRIVER_KMS_LEGACY_CONTEXT 0x20000
>
> /***********************************************************************/
> /** \name Macros to make printk easier */
> --
> 1.9.1
>
> _______________________________________________
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> Intel-gfx at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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