[PATCH 2/3] drm/etnaviv: allocate unique ID per drm_file

[Lucas Stach]

Allows to easily track if several fd are pointing to the same
execution context due to being dup'ed.

Signed-off-by: Lucas Stach <l.st...@pengutronix.de>
---
 drivers/gpu/drm/etnaviv/etnaviv_drv.c | 3 +++
 drivers/gpu/drm/etnaviv/etnaviv_drv.h | 1 +
 2 files changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/etnaviv/etnaviv_drv.c 
b/drivers/gpu/drm/etnaviv/etnaviv_drv.c
index 1d2b4fb4bcf8..b69edb40ae2a 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_drv.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_drv.c
@@ -49,6 +49,7 @@ static void load_gpu(struct drm_device *dev)
 static int etnaviv_open(struct drm_device *dev, struct drm_file *file)
 {
        struct etnaviv_drm_private *priv = dev->dev_private;
+       static atomic_t ident = ATOMIC_INIT(0);
        struct etnaviv_file_private *ctx;
        int ret, i;
 
@@ -56,6 +57,8 @@ static int etnaviv_open(struct drm_device *dev, struct 
drm_file *file)
        if (!ctx)
                return -ENOMEM;
 
+       ctx->id = atomic_inc_return(&ident);
+
        ctx->mmu = etnaviv_iommu_context_init(priv->mmu_global,
                                              priv->cmdbuf_suballoc);
        if (!ctx->mmu) {
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_drv.h 
b/drivers/gpu/drm/etnaviv/etnaviv_drv.h
index f32f4771dada..851b4b4ef146 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_drv.h
+++ b/drivers/gpu/drm/etnaviv/etnaviv_drv.h
@@ -27,6 +27,7 @@ struct etnaviv_iommu_global;
 #define ETNAVIV_SOFTPIN_START_ADDRESS  SZ_4M /* must be >= SUBALLOC_SIZE */
 
 struct etnaviv_file_private {
+       int id;
        struct etnaviv_iommu_context    *mmu;
        struct drm_sched_entity         sched_entity[ETNA_MAX_PIPES];
 };
-- 
2.30.2