- Linux-stable-mirror - lists.linaro.org

[PATCH v5 2/2] drm/buddy: Separate clear and dirty free block trees

by Arunpravin Paneer Selvam

Maintain two separate RB trees per order - one for clear (zeroed) blocks and another for dirty (uncleared) blocks. This separation improves code clarity and makes it more obvious which tree is being searched during allocation. It also improves scalability and efficiency when searching for a specific type of block, avoiding unnecessary checks and making the allocator more predictable under fragmentation. The changes have been validated using the existing drm_buddy_test KUnit test cases, along with selected graphics workloads, to ensure correctness and avoid regressions. v2: Missed adding the suggested-by tag. Added it in v2. v3(Matthew): - Remove the double underscores from the internal functions. - Rename the internal functions to have less generic names. - Fix the error handling code. - Pass tree argument for the tree macro. - Use the existing dirty/free bit instead of new tree field. - Make free_trees[] instead of clear_tree and dirty_tree for more cleaner approach. v4: - A bug was reported by Intel CI and it is fixed by Matthew Auld. - Replace the get_root function with &mm->free_trees[tree][order] (Matthew) - Remove the unnecessary rbtree_is_empty() check (Matthew) - Remove the unnecessary get_tree_for_flags() function. - Rename get_tree_for_block() name with get_block_tree() for more clarity. v5(Jani Nikula): - Don't use static inline in .c files. - enum free_tree and enumerator names are quite generic for a header and usage and the whole enum should be an implementation detail. Signed-off-by: Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam(a)amd.com> Suggested-by: Matthew Auld <matthew.auld(a)intel.com> Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/4260 --- drivers/gpu/drm/drm_buddy.c | 336 +++++++++++++++++++++--------------- include/drm/drm_buddy.h | 2 +- 2 files changed, 201 insertions(+), 137 deletions(-) diff --git a/drivers/gpu/drm/drm_buddy.c b/drivers/gpu/drm/drm_buddy.c index 978cabfbcf0f..4f96e2e17d08 100644 --- a/drivers/gpu/drm/drm_buddy.c +++ b/drivers/gpu/drm/drm_buddy.c @@ -12,8 +12,17 @@ #include <drm/drm_buddy.h> +enum drm_buddy_free_tree { + DRM_BUDDY_CLEAR_TREE = 0, + DRM_BUDDY_DIRTY_TREE, + DRM_BUDDY_MAX_FREE_TREES, +}; + static struct kmem_cache *slab_blocks; +#define for_each_free_tree(tree) \ + for ((tree) = 0; (tree) < DRM_BUDDY_MAX_FREE_TREES; (tree)++) + static struct drm_buddy_block *drm_block_alloc(struct drm_buddy *mm, struct drm_buddy_block *parent, unsigned int order, @@ -43,22 +52,61 @@ static void drm_block_free(struct drm_buddy *mm, kmem_cache_free(slab_blocks, block); } +static enum drm_buddy_free_tree +get_block_tree(struct drm_buddy_block *block) +{ + return drm_buddy_block_is_clear(block) ? + DRM_BUDDY_CLEAR_TREE : DRM_BUDDY_DIRTY_TREE; +} + +static struct drm_buddy_block * +rbtree_get_free_block(struct rb_node *node) +{ + return node ? rb_entry(node, struct drm_buddy_block, rb) : NULL; +} + +static struct drm_buddy_block * +rbtree_prev_free_block(struct rb_node *node) +{ + return rbtree_get_free_block(rb_prev(node)); +} + +static struct drm_buddy_block * +rbtree_first_free_block(struct rb_root *root) +{ + return rbtree_get_free_block(rb_first(root)); +} + +static struct drm_buddy_block * +rbtree_last_free_block(struct rb_root *root) +{ + return rbtree_get_free_block(rb_last(root)); +} + +static bool rbtree_is_empty(struct rb_root *root) +{ + return RB_EMPTY_ROOT(root); +} + static void rbtree_insert(struct drm_buddy *mm, - struct drm_buddy_block *block) + struct drm_buddy_block *block, + enum drm_buddy_free_tree tree) { - struct rb_root *root = &mm->free_tree[drm_buddy_block_order(block)]; - struct rb_node **link = &root->rb_node; - struct rb_node *parent = NULL; + struct rb_node **link, *parent = NULL; struct drm_buddy_block *node; - u64 offset; + struct rb_root *root; + unsigned int order; - offset = drm_buddy_block_offset(block); + order = drm_buddy_block_order(block); + + root = &mm->free_trees[tree][order]; + link = &root->rb_node; while (*link) { parent = *link; - node = rb_entry(parent, struct drm_buddy_block, rb); + node = rbtree_get_free_block(parent); - if (offset < drm_buddy_block_offset(node)) + if (drm_buddy_block_offset(block) < drm_buddy_block_offset(node)) link = &parent->rb_left; else link = &parent->rb_right; @@ -71,27 +119,17 @@ static void rbtree_insert(struct drm_buddy *mm, static void rbtree_remove(struct drm_buddy *mm, struct drm_buddy_block *block) { + unsigned int order = drm_buddy_block_order(block); struct rb_root *root; + enum drm_buddy_free_tree tree; - root = &mm->free_tree[drm_buddy_block_order(block)]; - rb_erase(&block->rb, root); + tree = get_block_tree(block); + root = &mm->free_trees[tree][order]; + rb_erase(&block->rb, root); RB_CLEAR_NODE(&block->rb); } -static inline struct drm_buddy_block * -rbtree_last_entry(struct drm_buddy *mm, unsigned int order) -{ - struct rb_node *node = rb_last(&mm->free_tree[order]); - - return node ? rb_entry(node, struct drm_buddy_block, rb) : NULL; -} - -static bool rbtree_is_empty(struct drm_buddy *mm, unsigned int order) -{ - return RB_EMPTY_ROOT(&mm->free_tree[order]); -} - static void clear_reset(struct drm_buddy_block *block) { block->header &= ~DRM_BUDDY_HEADER_CLEAR; @@ -114,10 +152,13 @@ static void mark_allocated(struct drm_buddy *mm, static void mark_free(struct drm_buddy *mm, struct drm_buddy_block *block) { + enum drm_buddy_free_tree tree; + block->header &= ~DRM_BUDDY_HEADER_STATE; block->header |= DRM_BUDDY_FREE; - rbtree_insert(mm, block); + tree = get_block_tree(block); + rbtree_insert(mm, block, tree); } static void mark_split(struct drm_buddy *mm, @@ -203,6 +244,7 @@ static int __force_merge(struct drm_buddy *mm, u64 end, unsigned int min_order) { + enum drm_buddy_free_tree tree; unsigned int order; int i; @@ -212,50 +254,49 @@ static int __force_merge(struct drm_buddy *mm, if (min_order > mm->max_order) return -EINVAL; - for (i = min_order - 1; i >= 0; i--) { - struct drm_buddy_block *block, *prev_block, *first_block; + for_each_free_tree(tree) { + for (i = min_order - 1; i >= 0; i--) { + struct rb_root *root = &mm->free_trees[tree][i]; + struct drm_buddy_block *block, *prev_block; - first_block = rb_entry(rb_first(&mm->free_tree[i]), struct drm_buddy_block, rb); + rbtree_reverse_for_each_entry_safe(block, prev_block, root, rb) { + struct drm_buddy_block *buddy; + u64 block_start, block_end; - rbtree_reverse_for_each_entry_safe(block, prev_block, &mm->free_tree[i], rb) { - struct drm_buddy_block *buddy; - u64 block_start, block_end; - - if (!block->parent) - continue; + if (!block->parent) + continue; - block_start = drm_buddy_block_offset(block); - block_end = block_start + drm_buddy_block_size(mm, block) - 1; + block_start = drm_buddy_block_offset(block); + block_end = block_start + drm_buddy_block_size(mm, block) - 1; - if (!contains(start, end, block_start, block_end)) - continue; + if (!contains(start, end, block_start, block_end)) + continue; - buddy = __get_buddy(block); - if (!drm_buddy_block_is_free(buddy)) - continue; + buddy = __get_buddy(block); + if (!drm_buddy_block_is_free(buddy)) + continue; - WARN_ON(drm_buddy_block_is_clear(block) == - drm_buddy_block_is_clear(buddy)); + WARN_ON(drm_buddy_block_is_clear(block) == + drm_buddy_block_is_clear(buddy)); - /* - * If the prev block is same as buddy, don't access the - * block in the next iteration as we would free the - * buddy block as part of the free function. - */ - if (prev_block && prev_block == buddy) { - if (prev_block != first_block) - prev_block = rb_entry(rb_prev(&prev_block->rb), - struct drm_buddy_block, - rb); - } + /* + * If the prev block is same as buddy, don't access the + * block in the next iteration as we would free the + * buddy block as part of the free function. + */ + if (prev_block && prev_block == buddy) { + if (prev_block != rbtree_first_free_block(root)) + prev_block = rbtree_prev_free_block(&prev_block->rb); + } - rbtree_remove(mm, block); - if (drm_buddy_block_is_clear(block)) - mm->clear_avail -= drm_buddy_block_size(mm, block); + rbtree_remove(mm, block); + if (drm_buddy_block_is_clear(block)) + mm->clear_avail -= drm_buddy_block_size(mm, block); - order = __drm_buddy_free(mm, block, true); - if (order >= min_order) - return 0; + order = __drm_buddy_free(mm, block, true); + if (order >= min_order) + return 0; + } } } @@ -276,7 +317,7 @@ static int __force_merge(struct drm_buddy *mm, */ int drm_buddy_init(struct drm_buddy *mm, u64 size, u64 chunk_size) { - unsigned int i; + unsigned int i, j; u64 offset; if (size < chunk_size) @@ -298,14 +339,22 @@ int drm_buddy_init(struct drm_buddy *mm, u64 size, u64 chunk_size) BUG_ON(mm->max_order > DRM_BUDDY_MAX_ORDER); - mm->free_tree = kmalloc_array(mm->max_order + 1, - sizeof(struct rb_root), - GFP_KERNEL); - if (!mm->free_tree) + mm->free_trees = kmalloc_array(DRM_BUDDY_MAX_FREE_TREES, + sizeof(*mm->free_trees), + GFP_KERNEL); + if (!mm->free_trees) return -ENOMEM; - for (i = 0; i <= mm->max_order; ++i) - mm->free_tree[i] = RB_ROOT; + for (i = 0; i < DRM_BUDDY_MAX_FREE_TREES; i++) { + mm->free_trees[i] = kmalloc_array(mm->max_order + 1, + sizeof(struct rb_root), + GFP_KERNEL); + if (!mm->free_trees[i]) + goto out_free_tree; + + for (j = 0; j <= mm->max_order; ++j) + mm->free_trees[i][j] = RB_ROOT; + } mm->n_roots = hweight64(size); @@ -353,7 +402,9 @@ int drm_buddy_init(struct drm_buddy *mm, u64 size, u64 chunk_size) drm_block_free(mm, mm->roots[i]); kfree(mm->roots); out_free_tree: - kfree(mm->free_tree); + while (i--) + kfree(mm->free_trees[i]); + kfree(mm->free_trees); return -ENOMEM; } EXPORT_SYMBOL(drm_buddy_init); @@ -389,8 +440,9 @@ void drm_buddy_fini(struct drm_buddy *mm) WARN_ON(mm->avail != mm->size); + for (i = 0; i < DRM_BUDDY_MAX_FREE_TREES; i++) + kfree(mm->free_trees[i]); kfree(mm->roots); - kfree(mm->free_tree); } EXPORT_SYMBOL(drm_buddy_fini); @@ -414,8 +466,7 @@ static int split_block(struct drm_buddy *mm, return -ENOMEM; } - mark_free(mm, block->left); - mark_free(mm, block->right); + mark_split(mm, block); if (drm_buddy_block_is_clear(block)) { mark_cleared(block->left); @@ -423,7 +474,8 @@ static int split_block(struct drm_buddy *mm, clear_reset(block); } - mark_split(mm, block); + mark_free(mm, block->left); + mark_free(mm, block->right); return 0; } @@ -456,6 +508,7 @@ EXPORT_SYMBOL(drm_get_buddy); */ void drm_buddy_reset_clear(struct drm_buddy *mm, bool is_clear) { + enum drm_buddy_free_tree src_tree, dst_tree; u64 root_size, size, start; unsigned int order; int i; @@ -470,19 +523,24 @@ void drm_buddy_reset_clear(struct drm_buddy *mm, bool is_clear) size -= root_size; } + src_tree = is_clear ? DRM_BUDDY_DIRTY_TREE : DRM_BUDDY_CLEAR_TREE; + dst_tree = is_clear ? DRM_BUDDY_CLEAR_TREE : DRM_BUDDY_DIRTY_TREE; + for (i = 0; i <= mm->max_order; ++i) { + struct rb_root *root = &mm->free_trees[src_tree][i]; struct drm_buddy_block *block; - rbtree_reverse_for_each_entry(block, &mm->free_tree[i], rb) { - if (is_clear != drm_buddy_block_is_clear(block)) { - if (is_clear) { - mark_cleared(block); - mm->clear_avail += drm_buddy_block_size(mm, block); - } else { - clear_reset(block); - mm->clear_avail -= drm_buddy_block_size(mm, block); - } + rbtree_reverse_for_each_entry(block, root, rb) { + rbtree_remove(mm, block); + if (is_clear) { + mark_cleared(block); + mm->clear_avail += drm_buddy_block_size(mm, block); + } else { + clear_reset(block); + mm->clear_avail -= drm_buddy_block_size(mm, block); } + + rbtree_insert(mm, block, dst_tree); } } } @@ -672,23 +730,17 @@ __drm_buddy_alloc_range_bias(struct drm_buddy *mm, } static struct drm_buddy_block * -get_maxblock(struct drm_buddy *mm, unsigned int order, - unsigned long flags) +get_maxblock(struct drm_buddy *mm, + unsigned int order, + enum drm_buddy_free_tree tree) { struct drm_buddy_block *max_block = NULL, *block = NULL; + struct rb_root *root; unsigned int i; for (i = order; i <= mm->max_order; ++i) { - struct drm_buddy_block *tmp_block; - - rbtree_reverse_for_each_entry(tmp_block, &mm->free_tree[i], rb) { - if (block_incompatible(tmp_block, flags)) - continue; - - block = tmp_block; - break; - } - + root = &mm->free_trees[tree][i]; + block = rbtree_last_free_block(root); if (!block) continue; @@ -712,39 +764,39 @@ alloc_from_freetree(struct drm_buddy *mm, unsigned long flags) { struct drm_buddy_block *block = NULL; + struct rb_root *root; + enum drm_buddy_free_tree tree; unsigned int tmp; int err; + tree = (flags & DRM_BUDDY_CLEAR_ALLOCATION) ? + DRM_BUDDY_CLEAR_TREE : DRM_BUDDY_DIRTY_TREE; + if (flags & DRM_BUDDY_TOPDOWN_ALLOCATION) { - block = get_maxblock(mm, order, flags); + block = get_maxblock(mm, order, tree); if (block) /* Store the obtained block order */ tmp = drm_buddy_block_order(block); } else { for (tmp = order; tmp <= mm->max_order; ++tmp) { - struct drm_buddy_block *tmp_block; - - rbtree_reverse_for_each_entry(tmp_block, &mm->free_tree[tmp], rb) { - if (block_incompatible(tmp_block, flags)) - continue; - - block = tmp_block; - break; - } - + /* Get RB tree root for this order and tree */ + root = &mm->free_trees[tree][tmp]; + block = rbtree_last_free_block(root); if (block) break; } } if (!block) { - /* Fallback method */ + /* Try allocating from the other tree */ + tree = (tree == DRM_BUDDY_CLEAR_TREE) ? + DRM_BUDDY_DIRTY_TREE : DRM_BUDDY_CLEAR_TREE; + for (tmp = order; tmp <= mm->max_order; ++tmp) { - if (!rbtree_is_empty(mm, tmp)) { - block = rbtree_last_entry(mm, tmp); - if (block) - break; - } + root = &mm->free_trees[tree][tmp]; + block = rbtree_last_free_block(root); + if (block) + break; } if (!block) @@ -888,6 +940,7 @@ static int __alloc_contig_try_harder(struct drm_buddy *mm, u64 rhs_offset, lhs_offset, lhs_size, filled; struct drm_buddy_block *block; LIST_HEAD(blocks_lhs); + enum drm_buddy_free_tree tree; unsigned long pages; unsigned int order; u64 modify_size; @@ -899,34 +952,39 @@ static int __alloc_contig_try_harder(struct drm_buddy *mm, if (order == 0) return -ENOSPC; - if (rbtree_is_empty(mm, order)) + if (rbtree_is_empty(&mm->free_trees[DRM_BUDDY_CLEAR_TREE][order]) && + rbtree_is_empty(&mm->free_trees[DRM_BUDDY_DIRTY_TREE][order])) return -ENOSPC; - rbtree_reverse_for_each_entry(block, &mm->free_tree[order], rb) { - /* Allocate blocks traversing RHS */ - rhs_offset = drm_buddy_block_offset(block); - err = __drm_buddy_alloc_range(mm, rhs_offset, size, - &filled, blocks); - if (!err || err != -ENOSPC) - return err; - - lhs_size = max((size - filled), min_block_size); - if (!IS_ALIGNED(lhs_size, min_block_size)) - lhs_size = round_up(lhs_size, min_block_size); - - /* Allocate blocks traversing LHS */ - lhs_offset = drm_buddy_block_offset(block) - lhs_size; - err = __drm_buddy_alloc_range(mm, lhs_offset, lhs_size, - NULL, &blocks_lhs); - if (!err) { - list_splice(&blocks_lhs, blocks); - return 0; - } else if (err != -ENOSPC) { + for_each_free_tree(tree) { + struct rb_root *root = &mm->free_trees[tree][order]; + + rbtree_reverse_for_each_entry(block, root, rb) { + /* Allocate blocks traversing RHS */ + rhs_offset = drm_buddy_block_offset(block); + err = __drm_buddy_alloc_range(mm, rhs_offset, size, + &filled, blocks); + if (!err || err != -ENOSPC) + return err; + + lhs_size = max((size - filled), min_block_size); + if (!IS_ALIGNED(lhs_size, min_block_size)) + lhs_size = round_up(lhs_size, min_block_size); + + /* Allocate blocks traversing LHS */ + lhs_offset = drm_buddy_block_offset(block) - lhs_size; + err = __drm_buddy_alloc_range(mm, lhs_offset, lhs_size, + NULL, &blocks_lhs); + if (!err) { + list_splice(&blocks_lhs, blocks); + return 0; + } else if (err != -ENOSPC) { + drm_buddy_free_list_internal(mm, blocks); + return err; + } + /* Free blocks for the next iteration */ drm_buddy_free_list_internal(mm, blocks); - return err; } - /* Free blocks for the next iteration */ - drm_buddy_free_list_internal(mm, blocks); } return -ENOSPC; @@ -1231,6 +1289,7 @@ EXPORT_SYMBOL(drm_buddy_block_print); */ void drm_buddy_print(struct drm_buddy *mm, struct drm_printer *p) { + enum drm_buddy_free_tree tree; int order; drm_printf(p, "chunk_size: %lluKiB, total: %lluMiB, free: %lluMiB, clear_free: %lluMiB\n", @@ -1238,11 +1297,16 @@ void drm_buddy_print(struct drm_buddy *mm, struct drm_printer *p) for (order = mm->max_order; order >= 0; order--) { struct drm_buddy_block *block; + struct rb_root *root; u64 count = 0, free; - rbtree_for_each_entry(block, &mm->free_tree[order], rb) { - BUG_ON(!drm_buddy_block_is_free(block)); - count++; + for_each_free_tree(tree) { + root = &mm->free_trees[tree][order]; + + rbtree_for_each_entry(block, root, rb) { + BUG_ON(!drm_buddy_block_is_free(block)); + count++; + } } drm_printf(p, "order-%2d ", order); diff --git a/include/drm/drm_buddy.h b/include/drm/drm_buddy.h index 091823592034..a2189a92bb7a 100644 --- a/include/drm/drm_buddy.h +++ b/include/drm/drm_buddy.h @@ -73,7 +73,7 @@ struct drm_buddy_block { */ struct drm_buddy { /* Maintain a free list for each order. */ - struct rb_root *free_tree; + struct rb_root **free_trees; /* * Maintain explicit binary tree(s) to track the allocation of the -- 2.34.1

2 weeks, 2 days

2
1
0 0

[PATCH v3 0/2] i2c: pxa: fix I2C communication on Armada 3700

by Gabor Juhos

There is a long standing bug which causes I2C communication not to work on the Armada 3700 based boards. The first patch in the series fixes that regression. The second patch improves recovery to make it more robust which helps to avoid communication problems with certain SFP modules. Signed-off-by: Gabor Juhos <j4g8y7(a)gmail.com> --- Changes in v3: - rebase on tip of i2c/for-current - remove Imre's tag from the cover letter, and replace his SoB tag to Reviewed-by in the individual patches - rework the second patch so it does not need changes in the I2C core code, and drop the first one as it is not needed now - Link to v2: https://lore.kernel.org/r/20250811-i2c-pxa-fix-i2c-communication-v2-0-ca42e… Changes in v2: - collect offered tags - rebase and retest on tip of i2c/for-current - Link to v1: https://lore.kernel.org/r/20250511-i2c-pxa-fix-i2c-communication-v1-0-e9097… --- Gabor Juhos (2): i2c: pxa: defer reset on Armada 3700 when recovery is used i2c: pxa: handle 'Early Bus Busy' condition on Armada 3700 drivers/i2c/busses/i2c-pxa.c | 35 ++++++++++++++++++++++++++++------- 1 file changed, 28 insertions(+), 7 deletions(-) --- base-commit: 3dd22078026c7cad4d4a3f32c5dc5452c7180de8 change-id: 20250510-i2c-pxa-fix-i2c-communication-3e6de1e3d0c6 Best regards, -- Gabor Juhos <j4g8y7(a)gmail.com>

2 weeks, 2 days

2
8
0 0

[PATCH] PCI: j721e: Fix module autoloading

by Siddharth Vadapalli

Commit under Fixes added support to build the driver as a loadable module. However, it did not add MODULE_DEVICE_TABLE() which is required for autoloading the driver when it is built as a loadable module. Fix it. Fixes: a2790bf81f0f ("PCI: j721e: Add support to build as a loadable module") Cc: <stable(a)vger.kernel.org> Signed-off-by: Siddharth Vadapalli <s-vadapalli(a)ti.com> --- Hello, This patch is based on commit b320789d6883 Linux 6.17-rc4 of Mainline Linux. Patch has been tested on J7200-EVM with the driver configs set to 'm'. The pci-j721e.c driver is autoloaded as Linux boots and it doesn't need to be manually probed. Logs: https://gist.github.com/Siddharth-Vadapalli-at-TI/f64eed4df6fd4f714747b3c7e… Regards, Siddharth. drivers/pci/controller/cadence/pci-j721e.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/pci/controller/cadence/pci-j721e.c b/drivers/pci/controller/cadence/pci-j721e.c index 6c93f39d0288..cfca13a4c840 100644 --- a/drivers/pci/controller/cadence/pci-j721e.c +++ b/drivers/pci/controller/cadence/pci-j721e.c @@ -440,6 +440,7 @@ static const struct of_device_id of_j721e_pcie_match[] = { }, {}, }; +MODULE_DEVICE_TABLE(of, of_j721e_pcie_match); static int j721e_pcie_probe(struct platform_device *pdev) { -- 2.43.0

2 weeks, 2 days

2
1
0 0

[PATCH 0/2] Backport request: mcp2221 needed to access eeprom data

by Romain Sioen

Hi maintainers, Please consider backporting the following patches to the stable trees. These patches fix a significant reading issue with mcp2221 on i2c eeprom. I have confirmed that the patches applie cleanly and build successfully against v6.6, v6.1, v5.15 and v5.10 stable branches. I will later come back to you with other patches that might need larger backport changes. Thanks, Romain Hamish Martin (2): HID: mcp2221: Don't set bus speed on every transfer HID: mcp2221: Handle reads greater than 60 bytes drivers/hid/hid-mcp2221.c | 71 +++++++++++++++++++++++++++------------ 1 file changed, 49 insertions(+), 22 deletions(-) -- 2.48.1

2 weeks, 2 days

1
2
0 0

5.10 backport request: ASoC: Intel: sof_rt5682: shrink platform_id names below 20 characters

by Michał Górny

Hello, I would like to request backporting the following patch to 5.10 series: 590cfb082837cc6c0c595adf1711330197c86a58 ASoC: Intel: sof_rt5682: shrink platform_id names below 20 characters The patch seems to be already present in 5.15 and newer branches, and its lack seems to be causing out-of-bounds read. I've hit it in the wild while trying to install 5.10.241 on i686: sh /var/tmp/portage/sys-kernel/gentoo-kernel-5.10.241/work/linux-5.10/scripts/depmod.sh depmod 5.10.241-gentoo-dist depmod: FATAL: Module index: bad character '�'=0x80 - only 7-bit ASCII is supported: platform:jsl_rt5682_max98360ax� TIA. -- Best regards, Michał Górny

2 weeks, 2 days

3
17
0 0

[PATCH v4 2/4] x86/cpu/topology: Always try cpu_parse_topology_ext() on AMD/Hygon

by K Prateek Nayak

Support for parsing the topology on AMD/Hygon processors using CPUID leaf 0xb was added in commit 3986a0a805e6 ("x86/CPU/AMD: Derive CPU topology from CPUID function 0xB when available"). In an effort to keep all the topology parsing bits in one place, this commit also introduced a pseudo dependency on the TOPOEXT feature to parse the CPUID leaf 0xb. TOPOEXT feature (CPUID 0x80000001 ECX[22]) advertises the support for Cache Properties leaf 0x8000001d and the CPUID leaf 0x8000001e EAX for "Extended APIC ID" however support for 0xb was introduced alongside the x2APIC support not only on AMD [1], but also historically on x86 [2]. Similar to 0xb, the support for extended CPU topology leaf 0x80000026 too does not depend on the TOPOEXT feature. The support for these leaves is expected to be confirmed by ensuring "leaf <= {extended_}cpuid_level" and then parsing the level 0 of the respective leaf to confirm EBX[15:0] (LogProcAtThisLevel) is non-zero as stated in the definition of "CPUID_Fn0000000B_EAX_x00 [Extended Topology Enumeration] (Core::X86::Cpuid::ExtTopEnumEax0)" in Processor Programming Reference (PPR) for AMD Family 19h Model 01h Rev B1 Vol1 [3] Sec. 2.1.15.1 "CPUID Instruction Functions". This has not been a problem on baremetal platforms since support for TOPOEXT (Fam 0x15 and later) predates the support for CPUID leaf 0xb (Fam 0x17[Zen2] and later), however, for AMD guests on QEMU, "x2apic" feature can be enabled independent of the "topoext" feature where QEMU expects topology and the initial APICID to be parsed using the CPUID leaf 0xb (especially when number of cores > 255) which is populated independent of the "topoext" feature flag. Unconditionally call cpu_parse_topology_ext() on AMD and Hygon processors to first parse the topology using the XTOPOLOGY leaves (0x80000026 / 0xb) before using the TOPOEXT leaf (0x8000001e). Cc: stable(a)vger.kernel.org # Only v6.9 and above Link: https://lore.kernel.org/lkml/1529686927-7665-1-git-send-email-suravee.suthi… [1] Link: https://lore.kernel.org/lkml/20080818181435.523309000@linux-os.sc.intel.com/ [2] Link: https://bugzilla.kernel.org/show_bug.cgi?id=206537 [3] Suggested-by: Naveen N Rao (AMD) <naveen(a)kernel.org> Fixes: 3986a0a805e6 ("x86/CPU/AMD: Derive CPU topology from CPUID function 0xB when available") Signed-off-by: K Prateek Nayak <kprateek.nayak(a)amd.com> --- Changelog v3..v4: o Quoted relevant section of the PPR justifying the changes. o Moved this patch up ahead. o Cc'd stable and made a note that backports should target v6.9 and above since this depends on the x86 topology rewrite. --- arch/x86/kernel/cpu/topology_amd.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-) diff --git a/arch/x86/kernel/cpu/topology_amd.c b/arch/x86/kernel/cpu/topology_amd.c index 827dd0dbb6e9..4e3134a5550c 100644 --- a/arch/x86/kernel/cpu/topology_amd.c +++ b/arch/x86/kernel/cpu/topology_amd.c @@ -175,18 +175,14 @@ static void topoext_fixup(struct topo_scan *tscan) static void parse_topology_amd(struct topo_scan *tscan) { - bool has_topoext = false; - /* - * If the extended topology leaf 0x8000_001e is available - * try to get SMT, CORE, TILE, and DIE shifts from extended + * Try to get SMT, CORE, TILE, and DIE shifts from extended * CPUID leaf 0x8000_0026 on supported processors first. If * extended CPUID leaf 0x8000_0026 is not supported, try to * get SMT and CORE shift from leaf 0xb first, then try to * get the CORE shift from leaf 0x8000_0008. */ - if (cpu_feature_enabled(X86_FEATURE_TOPOEXT)) - has_topoext = cpu_parse_topology_ext(tscan); + bool has_topoext = cpu_parse_topology_ext(tscan); if (cpu_feature_enabled(X86_FEATURE_AMD_HTR_CORES)) tscan->c->topo.cpu_type = cpuid_ebx(0x80000026); -- 2.34.1

2 weeks, 2 days

2
3
0 0

[PATCH v2 0/4] nios2: Add architecture support for clone3

by Simon Schuster via B4 Relay

This series adds support for the clone3 system call to the nios2 architecture. This addresses the build-time warning "warning: clone3() entry point is missing, please fix" introduced in 505d66d1abfb9 ("clone3: drop __ARCH_WANT_SYS_CLONE3 macro"). The implementation passes the relevant clone3 tests of kselftest when applied on top of next-20250815: ./run_kselftest.sh TAP version 13 1..4 # selftests: clone3: clone3 ok 1 selftests: clone3: clone3 # selftests: clone3: clone3_clear_sighand ok 2 selftests: clone3: clone3_clear_sighand # selftests: clone3: clone3_set_tid ok 3 selftests: clone3: clone3_set_tid # selftests: clone3: clone3_cap_checkpoint_restore ok 4 selftests: clone3: clone3_cap_checkpoint_restore The series also includes a small patch to kernel/fork.c that ensures that clone_flags are passed correctly on architectures where unsigned long is insufficient to store the u64 clone_flags. It is marked as a fix for stable backporting. As requested, in v2, this series now further tries to correct this type error throughout the whole code base. Thus, it now touches a larger number of subsystems and all architectures. Therefore, another test was performed for ARCH=x86_64 (as a representative for 64-bit architectures). Here, the series builds cleanly without warnings on defconfig with CONFIG_SECURITY_APPARMOR=y and CONFIG_SECURITY_TOMOYO=y (to compile-check the LSM-related changes). The build further successfully passes testing/selftests/clone3 (with the patch from 20241105062948.1037011-1-zhouyuhang1010(a)163.com to prepare clone3_cap_checkpoint_restore for compatibility with the newer libcap version on my system). Is there any option to further preflight check this patch series via lkp/KernelCI/etc. for a broader test across architectures, or is this degree of testing sufficient to eventually get the series merged? N.B.: The series is not checkpatch clean right now: - include/linux/cred.h, include/linux/mnt_namespace.h: function definition arguments without identifier name - include/trace/events/task.h: space prohibited after that open parenthesis I did not fix these warnings to keep my changes minimal and reviewable, as the issues persist throughout the files and they were not introduced by me; I only followed the existing code style and just replaced the types. If desired, I'd be happy to make the changes in a potential v3, though. Signed-off-by: Simon Schuster <schuster.simon(a)siemens-energy.com> --- Changes in v2: - Introduce "Fixes:" and "Cc: stable(a)vger.kernel.org" where necessary - Factor out "Fixes:" when adapting the datatype of clone_flags for easier backports - Fix additional instances where `unsigned long` clone_flags is used - Reword commit message to make it clearer that any 32-bit arch is affected by this bug - Link to v1: https://lore.kernel.org/r/20250821-nios2-implement-clone3-v1-0-1bb24017376a… --- Simon Schuster (4): copy_sighand: Handle architectures where sizeof(unsigned long) < sizeof(u64) copy_process: pass clone_flags as u64 across calltree arch: copy_thread: pass clone_flags as u64 nios2: implement architecture-specific portion of sys_clone3 arch/alpha/kernel/process.c | 2 +- arch/arc/kernel/process.c | 2 +- arch/arm/kernel/process.c | 2 +- arch/arm64/kernel/process.c | 2 +- arch/csky/kernel/process.c | 2 +- arch/hexagon/kernel/process.c | 2 +- arch/loongarch/kernel/process.c | 2 +- arch/m68k/kernel/process.c | 2 +- arch/microblaze/kernel/process.c | 2 +- arch/mips/kernel/process.c | 2 +- arch/nios2/include/asm/syscalls.h | 1 + arch/nios2/include/asm/unistd.h | 2 -- arch/nios2/kernel/entry.S | 6 ++++++ arch/nios2/kernel/process.c | 2 +- arch/nios2/kernel/syscall_table.c | 1 + arch/openrisc/kernel/process.c | 2 +- arch/parisc/kernel/process.c | 2 +- arch/powerpc/kernel/process.c | 2 +- arch/riscv/kernel/process.c | 2 +- arch/s390/kernel/process.c | 2 +- arch/sh/kernel/process_32.c | 2 +- arch/sparc/kernel/process_32.c | 2 +- arch/sparc/kernel/process_64.c | 2 +- arch/um/kernel/process.c | 2 +- arch/x86/include/asm/fpu/sched.h | 2 +- arch/x86/include/asm/shstk.h | 4 ++-- arch/x86/kernel/fpu/core.c | 2 +- arch/x86/kernel/process.c | 2 +- arch/x86/kernel/shstk.c | 2 +- arch/xtensa/kernel/process.c | 2 +- block/blk-ioc.c | 2 +- fs/namespace.c | 2 +- include/linux/cgroup.h | 4 ++-- include/linux/cred.h | 2 +- include/linux/iocontext.h | 6 +++--- include/linux/ipc_namespace.h | 4 ++-- include/linux/lsm_hook_defs.h | 2 +- include/linux/mnt_namespace.h | 2 +- include/linux/nsproxy.h | 2 +- include/linux/pid_namespace.h | 4 ++-- include/linux/rseq.h | 4 ++-- include/linux/sched/task.h | 2 +- include/linux/security.h | 4 ++-- include/linux/sem.h | 4 ++-- include/linux/time_namespace.h | 4 ++-- include/linux/uprobes.h | 4 ++-- include/linux/user_events.h | 4 ++-- include/linux/utsname.h | 4 ++-- include/net/net_namespace.h | 4 ++-- include/trace/events/task.h | 6 +++--- ipc/namespace.c | 2 +- ipc/sem.c | 2 +- kernel/cgroup/namespace.c | 2 +- kernel/cred.c | 2 +- kernel/events/uprobes.c | 2 +- kernel/fork.c | 10 +++++----- kernel/nsproxy.c | 4 ++-- kernel/pid_namespace.c | 2 +- kernel/sched/core.c | 4 ++-- kernel/sched/fair.c | 2 +- kernel/sched/sched.h | 4 ++-- kernel/time/namespace.c | 2 +- kernel/utsname.c | 2 +- net/core/net_namespace.c | 2 +- security/apparmor/lsm.c | 2 +- security/security.c | 2 +- security/selinux/hooks.c | 2 +- security/tomoyo/tomoyo.c | 2 +- 68 files changed, 95 insertions(+), 89 deletions(-) --- base-commit: 1357b2649c026b51353c84ddd32bc963e8999603 change-id: 20250818-nios2-implement-clone3-7f252c20860b Best regards, -- Simon Schuster <schuster.simon(a)siemens-energy.com>

2 weeks, 2 days

4
5
0 0

[PATCH v2] mtd: nand: raw: atmel: Respect tAR, tCLR in read setup timing

by A. Sverdlin

From: Alexander Sverdlin <alexander.sverdlin(a)siemens.com> Having setup time 0 violates tAR, tCLR of some chips, for instance TOSHIBA TC58NVG2S3ETAI0 cannot be detected successfully (first ID byte being read duplicated, i.e. 98 98 dc 90 15 76 14 03 instead of 98 dc 90 15 76 ...). Atmel Application Notes postulated 1 cycle NRD_SETUP without explanation [1], but it looks more appropriate to just calculate setup time properly. [1] Link: https://ww1.microchip.com/downloads/aemDocuments/documents/MPU32/Applicatio… Cc: stable(a)vger.kernel.org Fixes: f9ce2eddf176 ("mtd: nand: atmel: Add ->setup_data_interface() hooks") Signed-off-by: Alexander Sverdlin <alexander.sverdlin(a)siemens.com> --- v2: - Cc'ed stable - reformatted atmel_smc_cs_conf_set_setup() call - rebased onto mtd/fixes drivers/mtd/nand/raw/atmel/nand-controller.c | 16 +++++++++++++--- 1 file changed, 13 insertions(+), 3 deletions(-) diff --git a/drivers/mtd/nand/raw/atmel/nand-controller.c b/drivers/mtd/nand/raw/atmel/nand-controller.c index dedcca87defc7..ad0eff385e123 100644 --- a/drivers/mtd/nand/raw/atmel/nand-controller.c +++ b/drivers/mtd/nand/raw/atmel/nand-controller.c @@ -1377,14 +1377,24 @@ static int atmel_smc_nand_prepare_smcconf(struct atmel_nand *nand, if (ret) return ret; + /* + * Read setup timing depends on the operation done on the NAND: + * + * NRD_SETUP = max(tAR, tCLR) + */ + timeps = max(conf->timings.sdr.tAR_min, conf->timings.sdr.tCLR_min); + ncycles = DIV_ROUND_UP(timeps, mckperiodps); + totalcycles += ncycles; + ret = atmel_smc_cs_conf_set_setup(smcconf, ATMEL_SMC_NRD_SHIFT, ncycles); + if (ret) + return ret; + /* * The read cycle timing is directly matching tRC, but is also * dependent on the setup and hold timings we calculated earlier, * which gives: * - * NRD_CYCLE = max(tRC, NRD_PULSE + NRD_HOLD) - * - * NRD_SETUP is always 0. + * NRD_CYCLE = max(tRC, NRD_SETUP + NRD_PULSE + NRD_HOLD) */ ncycles = DIV_ROUND_UP(conf->timings.sdr.tRC_min, mckperiodps); ncycles = max(totalcycles, ncycles); -- 2.50.1

2 weeks, 2 days

4
6
0 0

[PATCH] mtd: rawnand: stm32_fmc2: fix ECC overwrite

by Christophe Kerello

In case OOB write is requested during a data write, ECC is currently lost. Avoid this issue by only writing in the free spare area. This issue has been seen with a YAFFS2 file system. Signed-off-by: Christophe Kerello <christophe.kerello(a)foss.st.com> Cc: stable(a)vger.kernel.org Fixes: 2cd457f328c1 ("mtd: rawnand: stm32_fmc2: add STM32 FMC2 NAND flash controller driver") --- drivers/mtd/nand/raw/stm32_fmc2_nand.c | 18 +++++++++++++++--- 1 file changed, 15 insertions(+), 3 deletions(-) diff --git a/drivers/mtd/nand/raw/stm32_fmc2_nand.c b/drivers/mtd/nand/raw/stm32_fmc2_nand.c index a960403081f11091837b73b8610231fe421d0c05..f84f23392fa441327bec90ba12a2a57d825d9330 100644 --- a/drivers/mtd/nand/raw/stm32_fmc2_nand.c +++ b/drivers/mtd/nand/raw/stm32_fmc2_nand.c @@ -996,9 +996,21 @@ static int stm32_fmc2_nfc_seq_write(struct nand_chip *chip, const u8 *buf, /* Write oob */ if (oob_required) { - ret = nand_change_write_column_op(chip, mtd->writesize, - chip->oob_poi, mtd->oobsize, - false); + unsigned int offset_in_page = mtd->writesize; + const void *buf = chip->oob_poi; + unsigned int len = mtd->oobsize; + + if (!raw) { + struct mtd_oob_region oob_free; + + mtd_ooblayout_free(mtd, 0, &oob_free); + offset_in_page += oob_free.offset; + buf += oob_free.offset; + len = oob_free.length; + } + + ret = nand_change_write_column_op(chip, offset_in_page, + buf, len, false); if (ret) return ret; } --- base-commit: fb2fae70e7e985c4acb1ad96110d8b98bb64a87c change-id: 20250811-fix-ecc-overwrite-9962b7797746 Best regards, -- Christophe Kerello <christophe.kerello(a)foss.st.com>

2 weeks, 2 days

2
1
0 0

[PATCH] mtd: rawnand: stm32_fmc2: avoid overlapping mappings on ECC buffer

by Christophe Kerello

Avoid below overlapping mappings by using a contiguous non-cacheable buffer. [ 4.077708] DMA-API: stm32_fmc2_nfc 48810000.nand-controller: cacheline tracking EEXIST, overlapping mappings aren't supported [ 4.089103] WARNING: CPU: 1 PID: 44 at kernel/dma/debug.c:568 add_dma_entry+0x23c/0x300 [ 4.097071] Modules linked in: [ 4.100101] CPU: 1 PID: 44 Comm: kworker/u4:2 Not tainted 6.1.82 #1 [ 4.106346] Hardware name: STMicroelectronics STM32MP257F VALID1 SNOR / MB1704 (LPDDR4 Power discrete) + MB1703 + MB1708 (SNOR MB1730) (DT) [ 4.118824] Workqueue: events_unbound deferred_probe_work_func [ 4.124674] pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 4.131624] pc : add_dma_entry+0x23c/0x300 [ 4.135658] lr : add_dma_entry+0x23c/0x300 [ 4.139792] sp : ffff800009dbb490 [ 4.143016] x29: ffff800009dbb4a0 x28: 0000000004008022 x27: ffff8000098a6000 [ 4.150174] x26: 0000000000000000 x25: ffff8000099e7000 x24: ffff8000099e7de8 [ 4.157231] x23: 00000000ffffffff x22: 0000000000000000 x21: ffff8000098a6a20 [ 4.164388] x20: ffff000080964180 x19: ffff800009819ba0 x18: 0000000000000006 [ 4.171545] x17: 6361727420656e69 x16: 6c6568636163203a x15: 72656c6c6f72746e [ 4.178602] x14: 6f632d646e616e2e x13: ffff800009832f58 x12: 00000000000004ec [ 4.185759] x11: 00000000000001a4 x10: ffff80000988af58 x9 : ffff800009832f58 [ 4.192916] x8 : 00000000ffffefff x7 : ffff80000988af58 x6 : 80000000fffff000 [ 4.199972] x5 : 000000000000bff4 x4 : 0000000000000000 x3 : 0000000000000000 [ 4.207128] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff0000812d2c40 [ 4.214185] Call trace: [ 4.216605] add_dma_entry+0x23c/0x300 [ 4.220338] debug_dma_map_sg+0x198/0x350 [ 4.224373] __dma_map_sg_attrs+0xa0/0x110 [ 4.228411] dma_map_sg_attrs+0x10/0x2c [ 4.232247] stm32_fmc2_nfc_xfer.isra.0+0x1c8/0x3fc [ 4.237088] stm32_fmc2_nfc_seq_read_page+0xc8/0x174 [ 4.242127] nand_read_oob+0x1d4/0x8e0 [ 4.245861] mtd_read_oob_std+0x58/0x84 [ 4.249596] mtd_read_oob+0x90/0x150 [ 4.253231] mtd_read+0x68/0xac Signed-off-by: Christophe Kerello <christophe.kerello(a)foss.st.com> Cc: stable(a)vger.kernel.org Fixes: 2cd457f328c1 ("mtd: rawnand: stm32_fmc2: add STM32 FMC2 NAND flash controller driver") --- drivers/mtd/nand/raw/stm32_fmc2_nand.c | 28 +++++++++------------------- 1 file changed, 9 insertions(+), 19 deletions(-) diff --git a/drivers/mtd/nand/raw/stm32_fmc2_nand.c b/drivers/mtd/nand/raw/stm32_fmc2_nand.c index a960403081f11091837b73b8610231fe421d0c05..222c3c3b684841879a55835e802dcf9983860c28 100644 --- a/drivers/mtd/nand/raw/stm32_fmc2_nand.c +++ b/drivers/mtd/nand/raw/stm32_fmc2_nand.c @@ -272,6 +272,7 @@ struct stm32_fmc2_nfc { struct sg_table dma_data_sg; struct sg_table dma_ecc_sg; u8 *ecc_buf; + dma_addr_t dma_ecc_addr; int dma_ecc_len; u32 tx_dma_max_burst; u32 rx_dma_max_burst; @@ -902,17 +903,10 @@ static int stm32_fmc2_nfc_xfer(struct nand_chip *chip, const u8 *buf, if (!write_data && !raw) { /* Configure DMA ECC status */ - p = nfc->ecc_buf; for_each_sg(nfc->dma_ecc_sg.sgl, sg, eccsteps, s) { - sg_set_buf(sg, p, nfc->dma_ecc_len); - p += nfc->dma_ecc_len; - } - - ret = dma_map_sg(nfc->dev, nfc->dma_ecc_sg.sgl, - eccsteps, dma_data_dir); - if (!ret) { - ret = -EIO; - goto err_unmap_data; + sg_dma_address(sg) = nfc->dma_ecc_addr + + s * nfc->dma_ecc_len; + sg_dma_len(sg) = nfc->dma_ecc_len; } desc_ecc = dmaengine_prep_slave_sg(nfc->dma_ecc_ch, @@ -921,7 +915,7 @@ static int stm32_fmc2_nfc_xfer(struct nand_chip *chip, const u8 *buf, DMA_PREP_INTERRUPT); if (!desc_ecc) { ret = -ENOMEM; - goto err_unmap_ecc; + goto err_unmap_data; } reinit_completion(&nfc->dma_ecc_complete); @@ -929,7 +923,7 @@ static int stm32_fmc2_nfc_xfer(struct nand_chip *chip, const u8 *buf, desc_ecc->callback_param = &nfc->dma_ecc_complete; ret = dma_submit_error(dmaengine_submit(desc_ecc)); if (ret) - goto err_unmap_ecc; + goto err_unmap_data; dma_async_issue_pending(nfc->dma_ecc_ch); } @@ -949,7 +943,7 @@ static int stm32_fmc2_nfc_xfer(struct nand_chip *chip, const u8 *buf, if (!write_data && !raw) dmaengine_terminate_all(nfc->dma_ecc_ch); ret = -ETIMEDOUT; - goto err_unmap_ecc; + goto err_unmap_data; } /* Wait DMA data transfer completion */ @@ -969,11 +963,6 @@ static int stm32_fmc2_nfc_xfer(struct nand_chip *chip, const u8 *buf, } } -err_unmap_ecc: - if (!write_data && !raw) - dma_unmap_sg(nfc->dev, nfc->dma_ecc_sg.sgl, - eccsteps, dma_data_dir); - err_unmap_data: dma_unmap_sg(nfc->dev, nfc->dma_data_sg.sgl, eccsteps, dma_data_dir); @@ -1610,7 +1599,8 @@ static int stm32_fmc2_nfc_dma_setup(struct stm32_fmc2_nfc *nfc) return ret; /* Allocate a buffer to store ECC status registers */ - nfc->ecc_buf = devm_kzalloc(nfc->dev, FMC2_MAX_ECC_BUF_LEN, GFP_KERNEL); + nfc->ecc_buf = dmam_alloc_coherent(nfc->dev, FMC2_MAX_ECC_BUF_LEN, + &nfc->dma_ecc_addr, GFP_KERNEL); if (!nfc->ecc_buf) return -ENOMEM; --- base-commit: fb2fae70e7e985c4acb1ad96110d8b98bb64a87c change-id: 20250811-fix-dma-overlapping-1c8fba7fd519 Best regards, -- Christophe Kerello <christophe.kerello(a)foss.st.com>

2 weeks, 2 days

2
1
0 0

2025

2024

2023

2022

2021

2020

2019

2018

2017

Linux-stable-mirror