From: Rob Clark <robdclark@xxxxxxxxxxxx> Intended as a way to trigger error paths in mesa. Signed-off-by: Rob Clark <robdclark@xxxxxxxxxxxx> --- drivers/gpu/drm/msm/msm_debugfs.c | 8 ++++++++ drivers/gpu/drm/msm/msm_drv.c | 15 +++++++++++++++ drivers/gpu/drm/msm/msm_drv.h | 7 +++++++ 3 files changed, 30 insertions(+) diff --git a/drivers/gpu/drm/msm/msm_debugfs.c b/drivers/gpu/drm/msm/msm_debugfs.c index ea2a20699cb4..a515ddcec007 100644 --- a/drivers/gpu/drm/msm/msm_debugfs.c +++ b/drivers/gpu/drm/msm/msm_debugfs.c @@ -7,6 +7,7 @@ #ifdef CONFIG_DEBUG_FS #include <linux/debugfs.h> +#include <linux/fault-inject.h> #include <drm/drm_debugfs.h> #include <drm/drm_file.h> @@ -325,6 +326,13 @@ void msm_debugfs_init(struct drm_minor *minor) if (priv->kms && priv->kms->funcs->debugfs_init) priv->kms->funcs->debugfs_init(priv->kms, minor); + +#ifdef CONFIG_FAULT_INJECTION + fault_create_debugfs_attr("fail_gem_alloc", minor->debugfs_root, + &fail_gem_alloc); + fault_create_debugfs_attr("fail_gem_iova", minor->debugfs_root, + &fail_gem_iova); +#endif } #endif diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c index 4979aa8187ec..6b1b483ddd59 100644 --- a/drivers/gpu/drm/msm/msm_drv.c +++ b/drivers/gpu/drm/msm/msm_drv.c @@ -6,6 +6,7 @@ */ #include <linux/dma-mapping.h> +#include <linux/fault-inject.h> #include <linux/kthread.h> #include <linux/sched/mm.h> #include <linux/uaccess.h> @@ -78,6 +79,11 @@ static bool modeset = true; MODULE_PARM_DESC(modeset, "Use kernel modesetting [KMS] (1=on (default), 0=disable)"); module_param(modeset, bool, 0600); +#ifdef CONFIG_FAULT_INJECTION +DECLARE_FAULT_ATTR(fail_gem_alloc); +DECLARE_FAULT_ATTR(fail_gem_iova); +#endif + static irqreturn_t msm_irq(int irq, void *arg) { struct drm_device *dev = arg; @@ -701,6 +707,9 @@ static int msm_ioctl_gem_new(struct drm_device *dev, void *data, flags |= MSM_BO_WC; } + if (should_fail(&fail_gem_alloc, args->size)) + return -ENOMEM; + return msm_gem_new_handle(dev, file, args->size, args->flags, &args->handle, NULL); } @@ -762,6 +771,9 @@ static int msm_ioctl_gem_info_iova(struct drm_device *dev, if (!priv->gpu) return -EINVAL; + if (should_fail(&fail_gem_iova, obj->size)) + return -ENOMEM; + /* * Don't pin the memory here - just get an address so that userspace can * be productive @@ -783,6 +795,9 @@ static int msm_ioctl_gem_info_set_iova(struct drm_device *dev, if (priv->gpu->aspace == ctx->aspace) return -EOPNOTSUPP; + if (should_fail(&fail_gem_iova, obj->size)) + return -ENOMEM; + return msm_gem_set_iova(obj, ctx->aspace, iova); } diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h index b4ace34ec889..e830f9609f2d 100644 --- a/drivers/gpu/drm/msm/msm_drv.h +++ b/drivers/gpu/drm/msm/msm_drv.h @@ -34,6 +34,13 @@ #include <drm/msm_drm.h> #include <drm/drm_gem.h> +#ifdef CONFIG_FAULT_INJECTION +extern struct fault_attr fail_gem_alloc; +extern struct fault_attr fail_gem_iova; +#else +# define should_fail(attr, size) 0 +#endif + struct msm_kms; struct msm_gpu; struct msm_mmu; -- 2.36.1