Linaro-mm-sig

linaro-mm-sig@lists.linaro.org

27 participants
6613 discussions

by sarahcolter＠wshu.net

Have you ever felt the exhilarating rush of speed, the focus demanded by precision, and the utter satisfaction of overcoming a seemingly impossible challenge? If so, then you might just be ready to tackle Slope. This deceptively simple online game has captivated players with its addictive gameplay and endless potential for improvement. It's a perfect little escape for a quick break or a dedicated practice session. Let's dive into how to play and, more importantly, how to experience the thrill of Slope. Introduction: What is Slope? At its core, Slope is a rolling ball game. You control a ball that’s constantly moving downhill, navigating a procedurally generated landscape of interconnected platforms. Sounds straightforward, right? Don’t be fooled! The platforms narrow, the speed increases relentlessly, and the gaps between platforms widen as you progress. One wrong move and you’re plummeting into the abyss. https://slopegame-online.com The brilliance of Slope lies in its accessibility and its learning curve. It's incredibly easy to pick up and play, yet fiendishly difficult to master. You don't need complicated controllers or extensive tutorials. Just a keyboard, a steady hand, and a determined spirit. It's a perfect example of a simple concept executed brilliantly. Gameplay: Navigating the Perilous Path The controls are as minimal as the aesthetic: the left and right arrow keys are all you need to guide your ball. Use the left arrow key to steer the ball left, and the right arrow key to steer it right. That's it! But mastering those two keys is the key to survival. Your objective is to stay on the platforms for as long as possible. As you roll further down the slope, your speed increases, and the environment becomes increasingly challenging. Red blocks appear, acting as obstacles that instantly end your run if touched. The platforms themselves will start to shift and move, adding another layer of complexity to the game. The game ends when your ball falls off the platform. Your score is determined by the distance you travelled before your demise. The higher the score, the better! The goal is to constantly improve your score, pushing yourself to see just how far you can go. Tips and Tricks for Conquering the Slope While the controls are simple, mastering Slope requires practice and a good understanding of the game's mechanics. Here are a few tips to help you improve your game: Smooth Movements Are Key: Avoid jerky, panicked movements. Small, controlled adjustments are far more effective than large, sweeping ones. Think less about reacting and more about anticipating. Look Ahead: Try to focus a little further down the slope. Anticipating the next turn or gap will give you more time to react and adjust your trajectory. This is easier said than done when the speed is high, but it's a crucial skill to develop. Embrace the Momentum: Understand how your ball's momentum affects its movement. Learn how to use the slight curve of the platforms to your advantage, especially when approaching tight turns. Don't Fear the Edges: Sometimes, the safest route is to ride along the edge of the platform. This allows you to make small corrections and avoid potential obstacles in the center. Practice, Practice, Practice: There's no substitute for practice. The more you play, the better you'll become at anticipating the challenges and reacting accordingly. Don't get discouraged by early failures. Everyone starts somewhere. You can visit Slope to begin practicing! Learn from Your Mistakes: Analyze your failures. What caused you to fall off the platform? Were you too slow to react? Did you misjudge the turn? Understanding your mistakes will help you avoid them in the future. Conclusion: The Enduring Appeal of an Endless Game Slope isn't about complicated storylines, stunning graphics, or intricate controls. It's about the pure, unadulterated challenge of pushing your skills to the limit. It's about the satisfaction of mastering a seemingly impossible task. It's about the addictive loop of playing, failing, learning, and improving. And its accessible nature means anyone can jump in and experience that thrill. So, go ahead, give it a try. You might just find yourself hooked on the endless decline. The simple controls and challenging gameplay make it a strangely addictive experience. It's a testament to the idea that sometimes, the simplest games are the most engaging.

2 weeks, 2 days

[bug report] dma-buf: heaps: Rework heap allocation hooks to return struct dma_buf instead of fd

by Dan Carpenter

I'm not sure exactly who to report this bug too. Probably the mm devs? drivers/dma-buf/heaps/system_heap.c:499 system_heap_allocate() warn: passing positive error code 's32min-(-1),1' to 'ERR_PTR' drivers/dma-buf/heaps/system_heap.c 459 if (cc_shared) { 460 for_each_sgtable_sg(table, sg, i) { 461 ret = system_heap_set_page_decrypted(sg_page(sg)); 462 if (ret) 463 goto free_pages; It kind of looks like system_heap_set_page_decrypted() can return 1. 464 } 465 } 466 467 /* create the dmabuf */ 468 exp_info.exp_name = dma_heap_get_name(heap); 469 exp_info.ops = &system_heap_buf_ops; 470 exp_info.size = buffer->len; 471 exp_info.flags = fd_flags; 472 exp_info.priv = buffer; 473 dmabuf = dma_buf_export(&exp_info); 474 if (IS_ERR(dmabuf)) { 475 ret = PTR_ERR(dmabuf); 476 goto free_pages; 477 } 478 return dmabuf; 479 480 free_pages: 481 for_each_sgtable_sg(table, sg, i) { 482 struct page *p = sg_page(sg); 483 484 /* 485 * Intentionally leak pages that cannot be re-encrypted 486 * to prevent shared memory from being reused. 487 */ 488 if (buffer->cc_shared && 489 system_heap_set_page_encrypted(p)) 490 continue; 491 __free_pages(p, compound_order(p)); 492 } 493 sg_free_table(table); 494 free_buffer: 495 list_for_each_entry_safe(page, tmp_page, &pages, lru) 496 __free_pages(page, compound_order(page)); 497 kfree(buffer); 498 --> 499 return ERR_PTR(ret); 500 } The problem is that add_to_pagemap() returns PM_END_OF_BUFFER (1) which is used by pagemap_read() and nowhere else. The call tree is: system_heap_allocate() system_heap_set_page_decrypted() set_memory_decrypted() realm_set_memory_decrypted() __set_memory_enc_dec() __change_memory_common() update_range_prot() walk_kernel_page_table_range_lockless() walk_pgd_range() pagemap_pte_hole() add_to_pagemap() This code seems sort of old and I guess no one has reported the bug so maybe it's a false positive, but it feels like it's asking for problems to return the PM_END_OF_BUFFER. There aren't any comments on any of those functions above explaining what return values are expected. This email is a free service from the Smatch-CI project [smatch.sf.net]. regards, dan carpenter

2 weeks, 3 days

[PATCH V1] accel/amdxdna: Remove mmap and export support for ubuf

by Lizhi Hou

Ubuf pages should not be mmaped or exported. Remove the ubuf mmap callback and return -EOPNOTSUPP when exporting ubuf objects. ubuf vmap is also removed for there is not a real use case yet. Fixes: bd72d4acda10 ("accel/amdxdna: Support user space allocated buffer") Cc: Christian Koenig <christian.koenig(a)amd.com> Signed-off-by: Lizhi Hou <lizhi.hou(a)amd.com> --- drivers/accel/amdxdna/amdxdna_gem.c | 9 +++++++- drivers/accel/amdxdna/amdxdna_gem.h | 2 ++ drivers/accel/amdxdna/amdxdna_ubuf.c | 32 ---------------------------- 3 files changed, 10 insertions(+), 33 deletions(-) diff --git a/drivers/accel/amdxdna/amdxdna_gem.c b/drivers/accel/amdxdna/amdxdna_gem.c index 319d2064fafa..6087264ba1b5 100644 --- a/drivers/accel/amdxdna/amdxdna_gem.c +++ b/drivers/accel/amdxdna/amdxdna_gem.c @@ -492,6 +492,9 @@ static struct dma_buf *amdxdna_gem_prime_export(struct drm_gem_object *gobj, int struct amdxdna_gem_obj *abo = to_xdna_obj(gobj); DEFINE_DMA_BUF_EXPORT_INFO(exp_info); + if (abo->pri) + return ERR_PTR(-EOPNOTSUPP); + if (abo->dma_buf) { get_dma_buf(abo->dma_buf); return abo->dma_buf; @@ -716,6 +719,7 @@ amdxdna_gem_create_ubuf_object(struct drm_device *dev, struct amdxdna_drm_create { struct amdxdna_dev *xdna = to_xdna_dev(dev); struct amdxdna_drm_va_tbl va_tbl; + struct amdxdna_gem_obj *abo; struct drm_gem_object *gobj; struct dma_buf *dma_buf; @@ -742,7 +746,10 @@ amdxdna_gem_create_ubuf_object(struct drm_device *dev, struct amdxdna_drm_create dma_buf_put(dma_buf); - return to_xdna_obj(gobj); + abo = to_xdna_obj(gobj); + abo->pri = true; + + return abo; } static struct amdxdna_gem_obj * diff --git a/drivers/accel/amdxdna/amdxdna_gem.h b/drivers/accel/amdxdna/amdxdna_gem.h index 4fc48a1189d2..162e5499f5e0 100644 --- a/drivers/accel/amdxdna/amdxdna_gem.h +++ b/drivers/accel/amdxdna/amdxdna_gem.h @@ -54,6 +54,8 @@ struct amdxdna_gem_obj { /* True, if BO is managed by XRT, not application */ bool internal; + /* True, if BO is not exportable */ + bool pri; }; #define to_gobj(obj) (&(obj)->base.base) diff --git a/drivers/accel/amdxdna/amdxdna_ubuf.c b/drivers/accel/amdxdna/amdxdna_ubuf.c index 3769210c55cc..df4ab225fbf9 100644 --- a/drivers/accel/amdxdna/amdxdna_ubuf.c +++ b/drivers/accel/amdxdna/amdxdna_ubuf.c @@ -87,42 +87,10 @@ static const struct vm_operations_struct amdxdna_ubuf_vm_ops = { .fault = amdxdna_ubuf_vm_fault, }; -static int amdxdna_ubuf_mmap(struct dma_buf *dbuf, struct vm_area_struct *vma) -{ - struct amdxdna_ubuf_priv *ubuf = dbuf->priv; - - vma->vm_ops = &amdxdna_ubuf_vm_ops; - vma->vm_private_data = ubuf; - vm_flags_set(vma, VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP); - - return 0; -} - -static int amdxdna_ubuf_vmap(struct dma_buf *dbuf, struct iosys_map *map) -{ - struct amdxdna_ubuf_priv *ubuf = dbuf->priv; - void *kva; - - kva = vmap(ubuf->pages, ubuf->nr_pages, VM_MAP, PAGE_KERNEL); - if (!kva) - return -EINVAL; - - iosys_map_set_vaddr(map, kva); - return 0; -} - -static void amdxdna_ubuf_vunmap(struct dma_buf *dbuf, struct iosys_map *map) -{ - vunmap(map->vaddr); -} - static const struct dma_buf_ops amdxdna_ubuf_dmabuf_ops = { .map_dma_buf = amdxdna_ubuf_map, .unmap_dma_buf = amdxdna_ubuf_unmap, .release = amdxdna_ubuf_release, - .mmap = amdxdna_ubuf_mmap, - .vmap = amdxdna_ubuf_vmap, - .vunmap = amdxdna_ubuf_vunmap, }; static int readonly_va_entry(struct amdxdna_drm_va_entry *va_ent) -- 2.34.1

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