From 18533ff4158f3b33c00fb8a2c664d7636fa1dd3a Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Sat, 14 Jul 2018 11:38:28 +0200 Subject: [PATCH] kernel: backport page fragment API changes from 4.10+ to 4.9 mt76 now relies on this API Signed-off-by: Felix Fietkau --- ...or-releasing-multiple-instances-of-a.patch | 75 ++++++++++ ...c_page_frag-to-page_frag_alloc-and-_.patch | 137 ++++++++++++++++++ ..._frag-functions-to-__page_frag_cache.patch | 79 ++++++++++ 3 files changed, 291 insertions(+) create mode 100644 target/linux/generic/backport-4.9/040-mm-add-support-for-releasing-multiple-instances-of-a.patch create mode 100644 target/linux/generic/backport-4.9/041-mm-rename-__alloc_page_frag-to-page_frag_alloc-and-_.patch create mode 100644 target/linux/generic/backport-4.9/042-mm-rename-__page_frag-functions-to-__page_frag_cache.patch diff --git a/target/linux/generic/backport-4.9/040-mm-add-support-for-releasing-multiple-instances-of-a.patch b/target/linux/generic/backport-4.9/040-mm-add-support-for-releasing-multiple-instances-of-a.patch new file mode 100644 index 0000000000..84714ce1e1 --- /dev/null +++ b/target/linux/generic/backport-4.9/040-mm-add-support-for-releasing-multiple-instances-of-a.patch @@ -0,0 +1,75 @@ +From: Alexander Duyck +Date: Wed, 14 Dec 2016 15:05:26 -0800 +Subject: [PATCH] mm: add support for releasing multiple instances of a page + +Add a function that allows us to batch free a page that has multiple +references outstanding. Specifically this function can be used to drop +a page being used in the page frag alloc cache. With this drivers can +make use of functionality similar to the page frag alloc cache without +having to do any workarounds for the fact that there is no function that +frees multiple references. + +Link: http://lkml.kernel.org/r/20161110113606.76501.70752.stgit@ahduyck-blue-test.jf.intel.com +Signed-off-by: Alexander Duyck +Cc: "David S. Miller" +Cc: "James E.J. Bottomley" +Cc: Chris Metcalf +Cc: David Howells +Cc: Geert Uytterhoeven +Cc: Hans-Christian Noren Egtvedt +Cc: Helge Deller +Cc: James Hogan +Cc: Jeff Kirsher +Cc: Jonas Bonn +Cc: Keguang Zhang +Cc: Ley Foon Tan +Cc: Mark Salter +Cc: Max Filippov +Cc: Michael Ellerman +Cc: Michal Simek +Cc: Ralf Baechle +Cc: Rich Felker +Cc: Richard Kuo +Cc: Russell King +Cc: Steven Miao +Cc: Tobias Klauser +Cc: Vineet Gupta +Cc: Yoshinori Sato +Signed-off-by: Andrew Morton +Signed-off-by: Linus Torvalds +--- + +--- a/include/linux/gfp.h ++++ b/include/linux/gfp.h +@@ -506,6 +506,8 @@ extern void free_hot_cold_page(struct pa + extern void free_hot_cold_page_list(struct list_head *list, bool cold); + + struct page_frag_cache; ++extern void __page_frag_drain(struct page *page, unsigned int order, ++ unsigned int count); + extern void *__alloc_page_frag(struct page_frag_cache *nc, + unsigned int fragsz, gfp_t gfp_mask); + extern void __free_page_frag(void *addr); +--- a/mm/page_alloc.c ++++ b/mm/page_alloc.c +@@ -3946,6 +3946,20 @@ static struct page *__page_frag_refill(s + return page; + } + ++void __page_frag_drain(struct page *page, unsigned int order, ++ unsigned int count) ++{ ++ VM_BUG_ON_PAGE(page_ref_count(page) == 0, page); ++ ++ if (page_ref_sub_and_test(page, count)) { ++ if (order == 0) ++ free_hot_cold_page(page, false); ++ else ++ __free_pages_ok(page, order); ++ } ++} ++EXPORT_SYMBOL(__page_frag_drain); ++ + void *__alloc_page_frag(struct page_frag_cache *nc, + unsigned int fragsz, gfp_t gfp_mask) + { diff --git a/target/linux/generic/backport-4.9/041-mm-rename-__alloc_page_frag-to-page_frag_alloc-and-_.patch b/target/linux/generic/backport-4.9/041-mm-rename-__alloc_page_frag-to-page_frag_alloc-and-_.patch new file mode 100644 index 0000000000..896ba415fe --- /dev/null +++ b/target/linux/generic/backport-4.9/041-mm-rename-__alloc_page_frag-to-page_frag_alloc-and-_.patch @@ -0,0 +1,137 @@ +From: Alexander Duyck +Date: Tue, 10 Jan 2017 16:58:06 -0800 +Subject: [PATCH] mm: rename __alloc_page_frag to page_frag_alloc and + __free_page_frag to page_frag_free + +Patch series "Page fragment updates", v4. + +This patch series takes care of a few cleanups for the page fragments +API. + +First we do some renames so that things are much more consistent. First +we move the page_frag_ portion of the name to the front of the functions +names. Secondly we split out the cache specific functions from the +other page fragment functions by adding the word "cache" to the name. + +Finally I added a bit of documentation that will hopefully help to +explain some of this. I plan to revisit this later as we get things +more ironed out in the near future with the changes planned for the DMA +setup to support eXpress Data Path. + +This patch (of 3): + +This patch renames the page frag functions to be more consistent with +other APIs. Specifically we place the name page_frag first in the name +and then have either an alloc or free call name that we append as the +suffix. This makes it a bit clearer in terms of naming. + +In addition we drop the leading double underscores since we are +technically no longer a backing interface and instead the front end that +is called from the networking APIs. + +Link: http://lkml.kernel.org/r/20170104023854.13451.67390.stgit@localhost.localdomain +Signed-off-by: Alexander Duyck +Signed-off-by: Andrew Morton +Signed-off-by: Linus Torvalds +--- + +--- a/include/linux/gfp.h ++++ b/include/linux/gfp.h +@@ -508,9 +508,9 @@ extern void free_hot_cold_page_list(stru + struct page_frag_cache; + extern void __page_frag_drain(struct page *page, unsigned int order, + unsigned int count); +-extern void *__alloc_page_frag(struct page_frag_cache *nc, +- unsigned int fragsz, gfp_t gfp_mask); +-extern void __free_page_frag(void *addr); ++extern void *page_frag_alloc(struct page_frag_cache *nc, ++ unsigned int fragsz, gfp_t gfp_mask); ++extern void page_frag_free(void *addr); + + #define __free_page(page) __free_pages((page), 0) + #define free_page(addr) free_pages((addr), 0) +--- a/include/linux/skbuff.h ++++ b/include/linux/skbuff.h +@@ -2471,7 +2471,7 @@ static inline struct sk_buff *netdev_all + + static inline void skb_free_frag(void *addr) + { +- __free_page_frag(addr); ++ page_frag_free(addr); + } + + void *napi_alloc_frag(unsigned int fragsz); +--- a/mm/page_alloc.c ++++ b/mm/page_alloc.c +@@ -3960,8 +3960,8 @@ void __page_frag_drain(struct page *page + } + EXPORT_SYMBOL(__page_frag_drain); + +-void *__alloc_page_frag(struct page_frag_cache *nc, +- unsigned int fragsz, gfp_t gfp_mask) ++void *page_frag_alloc(struct page_frag_cache *nc, ++ unsigned int fragsz, gfp_t gfp_mask) + { + unsigned int size = PAGE_SIZE; + struct page *page; +@@ -4012,19 +4012,19 @@ refill: + + return nc->va + offset; + } +-EXPORT_SYMBOL(__alloc_page_frag); ++EXPORT_SYMBOL(page_frag_alloc); + + /* + * Frees a page fragment allocated out of either a compound or order 0 page. + */ +-void __free_page_frag(void *addr) ++void page_frag_free(void *addr) + { + struct page *page = virt_to_head_page(addr); + + if (unlikely(put_page_testzero(page))) + __free_pages_ok(page, compound_order(page)); + } +-EXPORT_SYMBOL(__free_page_frag); ++EXPORT_SYMBOL(page_frag_free); + + static void *make_alloc_exact(unsigned long addr, unsigned int order, + size_t size) +--- a/net/core/skbuff.c ++++ b/net/core/skbuff.c +@@ -369,7 +369,7 @@ static void *__netdev_alloc_frag(unsigne + + local_irq_save(flags); + nc = this_cpu_ptr(&netdev_alloc_cache); +- data = __alloc_page_frag(nc, fragsz, gfp_mask); ++ data = page_frag_alloc(nc, fragsz, gfp_mask); + local_irq_restore(flags); + return data; + } +@@ -391,7 +391,7 @@ static void *__napi_alloc_frag(unsigned + { + struct napi_alloc_cache *nc = this_cpu_ptr(&napi_alloc_cache); + +- return __alloc_page_frag(&nc->page, fragsz, gfp_mask); ++ return page_frag_alloc(&nc->page, fragsz, gfp_mask); + } + + void *napi_alloc_frag(unsigned int fragsz) +@@ -441,7 +441,7 @@ struct sk_buff *__netdev_alloc_skb(struc + local_irq_save(flags); + + nc = this_cpu_ptr(&netdev_alloc_cache); +- data = __alloc_page_frag(nc, len, gfp_mask); ++ data = page_frag_alloc(nc, len, gfp_mask); + pfmemalloc = nc->pfmemalloc; + + local_irq_restore(flags); +@@ -505,7 +505,7 @@ struct sk_buff *__napi_alloc_skb(struct + if (sk_memalloc_socks()) + gfp_mask |= __GFP_MEMALLOC; + +- data = __alloc_page_frag(&nc->page, len, gfp_mask); ++ data = page_frag_alloc(&nc->page, len, gfp_mask); + if (unlikely(!data)) + return NULL; + diff --git a/target/linux/generic/backport-4.9/042-mm-rename-__page_frag-functions-to-__page_frag_cache.patch b/target/linux/generic/backport-4.9/042-mm-rename-__page_frag-functions-to-__page_frag_cache.patch new file mode 100644 index 0000000000..117b01d504 --- /dev/null +++ b/target/linux/generic/backport-4.9/042-mm-rename-__page_frag-functions-to-__page_frag_cache.patch @@ -0,0 +1,79 @@ +From: Alexander Duyck +Date: Tue, 10 Jan 2017 16:58:09 -0800 +Subject: [PATCH] mm: rename __page_frag functions to __page_frag_cache, drop + order from drain + +This patch does two things. + +First it goes through and renames the __page_frag prefixed functions to +__page_frag_cache so that we can be clear that we are draining or +refilling the cache, not the frags themselves. + +Second we drop the order parameter from __page_frag_cache_drain since we +don't actually need to pass it since all fragments are either order 0 or +must be a compound page. + +Link: http://lkml.kernel.org/r/20170104023954.13451.5678.stgit@localhost.localdomain +Signed-off-by: Alexander Duyck +Signed-off-by: Andrew Morton +Signed-off-by: Linus Torvalds +--- + +--- a/include/linux/gfp.h ++++ b/include/linux/gfp.h +@@ -506,8 +506,7 @@ extern void free_hot_cold_page(struct pa + extern void free_hot_cold_page_list(struct list_head *list, bool cold); + + struct page_frag_cache; +-extern void __page_frag_drain(struct page *page, unsigned int order, +- unsigned int count); ++extern void __page_frag_cache_drain(struct page *page, unsigned int count); + extern void *page_frag_alloc(struct page_frag_cache *nc, + unsigned int fragsz, gfp_t gfp_mask); + extern void page_frag_free(void *addr); +--- a/mm/page_alloc.c ++++ b/mm/page_alloc.c +@@ -3925,8 +3925,8 @@ EXPORT_SYMBOL(free_pages); + * drivers to provide a backing region of memory for use as either an + * sk_buff->head, or to be used in the "frags" portion of skb_shared_info. + */ +-static struct page *__page_frag_refill(struct page_frag_cache *nc, +- gfp_t gfp_mask) ++static struct page *__page_frag_cache_refill(struct page_frag_cache *nc, ++ gfp_t gfp_mask) + { + struct page *page = NULL; + gfp_t gfp = gfp_mask; +@@ -3946,19 +3946,20 @@ static struct page *__page_frag_refill(s + return page; + } + +-void __page_frag_drain(struct page *page, unsigned int order, +- unsigned int count) ++void __page_frag_cache_drain(struct page *page, unsigned int count) + { + VM_BUG_ON_PAGE(page_ref_count(page) == 0, page); + + if (page_ref_sub_and_test(page, count)) { ++ unsigned int order = compound_order(page); ++ + if (order == 0) + free_hot_cold_page(page, false); + else + __free_pages_ok(page, order); + } + } +-EXPORT_SYMBOL(__page_frag_drain); ++EXPORT_SYMBOL(__page_frag_cache_drain); + + void *page_frag_alloc(struct page_frag_cache *nc, + unsigned int fragsz, gfp_t gfp_mask) +@@ -3969,7 +3970,7 @@ void *page_frag_alloc(struct page_frag_c + + if (unlikely(!nc->va)) { + refill: +- page = __page_frag_refill(nc, gfp_mask); ++ page = __page_frag_cache_refill(nc, gfp_mask); + if (!page) + return NULL; + -- 2.30.2