From 73511edf8b196e6f1ccda0fdf294ff57aa2dc9db Mon Sep 17 00:00:00 2001 From: Christian König Date: Tue, 9 Nov 2021 11:08:18 +0100 Subject: dma-buf: specify usage while adding fences to dma_resv obj v7 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Instead of distingting between shared and exclusive fences specify the fence usage while adding fences. Rework all drivers to use this interface instead and deprecate the old one. v2: some kerneldoc comments suggested by Daniel v3: fix a missing case in radeon v4: rebase on nouveau changes, fix lockdep and temporary disable warning v5: more documentation updates v6: separate internal dma_resv changes from this patch, avoids to disable warning temporary, rebase on upstream changes v7: fix missed case in lima driver, minimize changes to i915_gem_busy_ioctl Signed-off-by: Christian König Reviewed-by: Daniel Vetter Link: https://patchwork.freedesktop.org/patch/msgid/20220407085946.744568-3-christian.koenig@amd.com --- drivers/dma-buf/dma-resv.c | 48 +++++++++++++++++++++++++++++++++++----------- 1 file changed, 37 insertions(+), 11 deletions(-) (limited to 'drivers/dma-buf/dma-resv.c') diff --git a/drivers/dma-buf/dma-resv.c b/drivers/dma-buf/dma-resv.c index 17237e6ee30c..543dae6566d2 100644 --- a/drivers/dma-buf/dma-resv.c +++ b/drivers/dma-buf/dma-resv.c @@ -234,14 +234,14 @@ EXPORT_SYMBOL(dma_resv_reserve_fences); #ifdef CONFIG_DEBUG_MUTEXES /** - * dma_resv_reset_shared_max - reset shared fences for debugging + * dma_resv_reset_max_fences - reset shared fences for debugging * @obj: the dma_resv object to reset * * Reset the number of pre-reserved shared slots to test that drivers do * correct slot allocation using dma_resv_reserve_fences(). See also * &dma_resv_list.shared_max. */ -void dma_resv_reset_shared_max(struct dma_resv *obj) +void dma_resv_reset_max_fences(struct dma_resv *obj) { struct dma_resv_list *fences = dma_resv_shared_list(obj); @@ -251,7 +251,7 @@ void dma_resv_reset_shared_max(struct dma_resv *obj) if (fences) fences->shared_max = fences->shared_count; } -EXPORT_SYMBOL(dma_resv_reset_shared_max); +EXPORT_SYMBOL(dma_resv_reset_max_fences); #endif /** @@ -264,7 +264,8 @@ EXPORT_SYMBOL(dma_resv_reset_shared_max); * * See also &dma_resv.fence for a discussion of the semantics. */ -void dma_resv_add_shared_fence(struct dma_resv *obj, struct dma_fence *fence) +static void dma_resv_add_shared_fence(struct dma_resv *obj, + struct dma_fence *fence) { struct dma_resv_list *fobj; struct dma_fence *old; @@ -305,13 +306,13 @@ replace: write_seqcount_end(&obj->seq); dma_fence_put(old); } -EXPORT_SYMBOL(dma_resv_add_shared_fence); /** * dma_resv_replace_fences - replace fences in the dma_resv obj * @obj: the reservation object * @context: the context of the fences to replace * @replacement: the new fence to use instead + * @usage: how the new fence is used, see enum dma_resv_usage * * Replace fences with a specified context with a new fence. Only valid if the * operation represented by the original fence has no longer access to the @@ -321,12 +322,16 @@ EXPORT_SYMBOL(dma_resv_add_shared_fence); * update fence which makes the resource inaccessible. */ void dma_resv_replace_fences(struct dma_resv *obj, uint64_t context, - struct dma_fence *replacement) + struct dma_fence *replacement, + enum dma_resv_usage usage) { struct dma_resv_list *list; struct dma_fence *old; unsigned int i; + /* Only readers supported for now */ + WARN_ON(usage != DMA_RESV_USAGE_READ); + dma_resv_assert_held(obj); write_seqcount_begin(&obj->seq); @@ -360,7 +365,8 @@ EXPORT_SYMBOL(dma_resv_replace_fences); * Add a fence to the exclusive slot. @obj must be locked with dma_resv_lock(). * See also &dma_resv.fence_excl for a discussion of the semantics. */ -void dma_resv_add_excl_fence(struct dma_resv *obj, struct dma_fence *fence) +static void dma_resv_add_excl_fence(struct dma_resv *obj, + struct dma_fence *fence) { struct dma_fence *old_fence = dma_resv_excl_fence(obj); @@ -375,7 +381,27 @@ void dma_resv_add_excl_fence(struct dma_resv *obj, struct dma_fence *fence) dma_fence_put(old_fence); } -EXPORT_SYMBOL(dma_resv_add_excl_fence); + +/** + * dma_resv_add_fence - Add a fence to the dma_resv obj + * @obj: the reservation object + * @fence: the fence to add + * @usage: how the fence is used, see enum dma_resv_usage + * + * Add a fence to a slot, @obj must be locked with dma_resv_lock(), and + * dma_resv_reserve_fences() has been called. + * + * See also &dma_resv.fence for a discussion of the semantics. + */ +void dma_resv_add_fence(struct dma_resv *obj, struct dma_fence *fence, + enum dma_resv_usage usage) +{ + if (usage == DMA_RESV_USAGE_WRITE) + dma_resv_add_excl_fence(obj, fence); + else + dma_resv_add_shared_fence(obj, fence); +} +EXPORT_SYMBOL(dma_resv_add_fence); /* Restart the iterator by initializing all the necessary fields, but not the * relation to the dma_resv object. */ @@ -574,7 +600,7 @@ int dma_resv_copy_fences(struct dma_resv *dst, struct dma_resv *src) } dma_fence_get(f); - if (dma_resv_iter_is_exclusive(&cursor)) + if (dma_resv_iter_usage(&cursor) == DMA_RESV_USAGE_WRITE) excl = f; else RCU_INIT_POINTER(list->shared[list->shared_count++], f); @@ -771,13 +797,13 @@ EXPORT_SYMBOL_GPL(dma_resv_test_signaled); */ void dma_resv_describe(struct dma_resv *obj, struct seq_file *seq) { + static const char *usage[] = { "write", "read" }; struct dma_resv_iter cursor; struct dma_fence *fence; dma_resv_for_each_fence(&cursor, obj, DMA_RESV_USAGE_READ, fence) { seq_printf(seq, "\t%s fence:", - dma_resv_iter_is_exclusive(&cursor) ? - "Exclusive" : "Shared"); + usage[dma_resv_iter_usage(&cursor)]); dma_fence_describe(fence, seq); } } -- cgit v1.2.3