From: Will Deacon <will@kernel.org> To: iommu@lists.linux-foundation.org Cc: linux-kernel@vger.kernel.org, Will Deacon <will@kernel.org>, Guenter Roeck <linux@roeck-us.net>, Claire Chang <tientzu@chromium.org>, Christoph Hellwig <hch@lst.de>, Robin Murphy <robin.murphy@arm.com>, Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>, Nathan Chancellor <nathan@kernel.org> Subject: [PATCH 5/5] swiotlb: Free tbl memory in swiotlb_exit() Date: Mon, 19 Jul 2021 13:30:54 +0100 [thread overview] Message-ID: <20210719123054.6844-6-will@kernel.org> (raw) In-Reply-To: <20210719123054.6844-1-will@kernel.org> Although swiotlb_exit() frees the 'slots' metadata array referenced by 'io_tlb_default_mem', it leaves the underlying buffer pages allocated despite no longer being usable. Extend swiotlb_exit() to free the buffer pages as well as the slots array. Cc: Claire Chang <tientzu@chromium.org> Cc: Christoph Hellwig <hch@lst.de> Cc: Robin Murphy <robin.murphy@arm.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Tested-by: Nathan Chancellor <nathan@kernel.org> Signed-off-by: Will Deacon <will@kernel.org> --- kernel/dma/swiotlb.c | 21 +++++++++++++++------ 1 file changed, 15 insertions(+), 6 deletions(-) diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c index b3c793ed9e64..87c40517e822 100644 --- a/kernel/dma/swiotlb.c +++ b/kernel/dma/swiotlb.c @@ -328,18 +328,27 @@ swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs) void __init swiotlb_exit(void) { - size_t size; struct io_tlb_mem *mem = &io_tlb_default_mem; + unsigned long tbl_vaddr; + size_t tbl_size, slots_size; if (!mem->nslabs) return; pr_info("tearing down default memory pool\n"); - size = array_size(sizeof(*mem->slots), mem->nslabs); - if (mem->late_alloc) - free_pages((unsigned long)mem->slots, get_order(size)); - else - memblock_free_late(__pa(mem->slots), PAGE_ALIGN(size)); + tbl_vaddr = (unsigned long)phys_to_virt(mem->start); + tbl_size = PAGE_ALIGN(mem->end - mem->start); + slots_size = PAGE_ALIGN(array_size(sizeof(*mem->slots), mem->nslabs)); + + set_memory_encrypted(tbl_vaddr, tbl_size >> PAGE_SHIFT); + if (mem->late_alloc) { + free_pages(tbl_vaddr, get_order(tbl_size)); + free_pages((unsigned long)mem->slots, get_order(slots_size)); + } else { + memblock_free_late(mem->start, tbl_size); + memblock_free_late(__pa(mem->slots), slots_size); + } + memset(mem, 0, sizeof(*mem)); } -- 2.32.0.402.g57bb445576-goog
WARNING: multiple messages have this Message-ID (diff)
From: Will Deacon <will@kernel.org> To: iommu@lists.linux-foundation.org Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>, Will Deacon <will@kernel.org>, linux-kernel@vger.kernel.org, Nathan Chancellor <nathan@kernel.org>, Claire Chang <tientzu@chromium.org>, Robin Murphy <robin.murphy@arm.com>, Christoph Hellwig <hch@lst.de>, Guenter Roeck <linux@roeck-us.net> Subject: [PATCH 5/5] swiotlb: Free tbl memory in swiotlb_exit() Date: Mon, 19 Jul 2021 13:30:54 +0100 [thread overview] Message-ID: <20210719123054.6844-6-will@kernel.org> (raw) In-Reply-To: <20210719123054.6844-1-will@kernel.org> Although swiotlb_exit() frees the 'slots' metadata array referenced by 'io_tlb_default_mem', it leaves the underlying buffer pages allocated despite no longer being usable. Extend swiotlb_exit() to free the buffer pages as well as the slots array. Cc: Claire Chang <tientzu@chromium.org> Cc: Christoph Hellwig <hch@lst.de> Cc: Robin Murphy <robin.murphy@arm.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Tested-by: Nathan Chancellor <nathan@kernel.org> Signed-off-by: Will Deacon <will@kernel.org> --- kernel/dma/swiotlb.c | 21 +++++++++++++++------ 1 file changed, 15 insertions(+), 6 deletions(-) diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c index b3c793ed9e64..87c40517e822 100644 --- a/kernel/dma/swiotlb.c +++ b/kernel/dma/swiotlb.c @@ -328,18 +328,27 @@ swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs) void __init swiotlb_exit(void) { - size_t size; struct io_tlb_mem *mem = &io_tlb_default_mem; + unsigned long tbl_vaddr; + size_t tbl_size, slots_size; if (!mem->nslabs) return; pr_info("tearing down default memory pool\n"); - size = array_size(sizeof(*mem->slots), mem->nslabs); - if (mem->late_alloc) - free_pages((unsigned long)mem->slots, get_order(size)); - else - memblock_free_late(__pa(mem->slots), PAGE_ALIGN(size)); + tbl_vaddr = (unsigned long)phys_to_virt(mem->start); + tbl_size = PAGE_ALIGN(mem->end - mem->start); + slots_size = PAGE_ALIGN(array_size(sizeof(*mem->slots), mem->nslabs)); + + set_memory_encrypted(tbl_vaddr, tbl_size >> PAGE_SHIFT); + if (mem->late_alloc) { + free_pages(tbl_vaddr, get_order(tbl_size)); + free_pages((unsigned long)mem->slots, get_order(slots_size)); + } else { + memblock_free_late(mem->start, tbl_size); + memblock_free_late(__pa(mem->slots), slots_size); + } + memset(mem, 0, sizeof(*mem)); } -- 2.32.0.402.g57bb445576-goog _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
next prev parent reply other threads:[~2021-07-19 12:32 UTC|newest] Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-07-19 12:30 [PATCH 0/5] Fix restricted DMA vs swiotlb_exit() Will Deacon 2021-07-19 12:30 ` Will Deacon 2021-07-19 12:30 ` [PATCH 1/5] of: Return success from of_dma_set_restricted_buffer() when !OF_ADDRESS Will Deacon 2021-07-19 12:30 ` Will Deacon 2021-07-20 3:35 ` Claire Chang 2021-07-20 3:35 ` Claire Chang 2021-07-19 12:30 ` [PATCH 2/5] swiotlb: Point io_default_tlb_mem at static allocation Will Deacon 2021-07-19 12:30 ` Will Deacon 2021-07-20 3:35 ` Claire Chang 2021-07-20 3:35 ` Claire Chang 2021-07-20 7:51 ` Christoph Hellwig 2021-07-20 7:51 ` Christoph Hellwig 2021-07-20 8:49 ` Will Deacon 2021-07-20 8:49 ` Will Deacon 2021-07-19 12:30 ` [PATCH 3/5] swiotlb: Remove io_tlb_default_mem indirection Will Deacon 2021-07-19 12:30 ` Will Deacon 2021-07-20 3:35 ` Claire Chang 2021-07-20 3:35 ` Claire Chang 2021-07-19 12:30 ` [PATCH 4/5] swiotlb: Emit diagnostic in swiotlb_exit() Will Deacon 2021-07-19 12:30 ` Will Deacon 2021-07-20 3:36 ` Claire Chang 2021-07-20 3:36 ` Claire Chang 2021-07-19 12:30 ` Will Deacon [this message] 2021-07-19 12:30 ` [PATCH 5/5] swiotlb: Free tbl memory " Will Deacon 2021-07-20 3:36 ` Claire Chang 2021-07-20 3:36 ` Claire Chang 2021-07-20 8:35 ` Will Deacon 2021-07-20 8:35 ` Will Deacon 2021-07-20 7:51 ` [PATCH 0/5] Fix restricted DMA vs swiotlb_exit() Christoph Hellwig 2021-07-20 7:51 ` Christoph Hellwig
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