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![Linus Torvalds](/assets/img/avatar_default.png)
- Initial support for running on a system with an Ultravisor, which is software that runs below the hypervisor and protects guests against some attacks by the hypervisor. - Support for building the kernel to run as a "Secure Virtual Machine", ie. as a guest capable of running on a system with an Ultravisor. - Some changes to our DMA code on bare metal, to allow devices with medium sized DMA masks (> 32 && < 59 bits) to use more than 2GB of DMA space. - Support for firmware assisted crash dumps on bare metal (powernv). - Two series fixing bugs in and refactoring our PCI EEH code. - A large series refactoring our exception entry code to use gas macros, both to make it more readable and also enable some future optimisations. As well as many cleanups and other minor features & fixups. Thanks to: Adam Zerella, Alexey Kardashevskiy, Alistair Popple, Andrew Donnellan, Aneesh Kumar K.V, Anju T Sudhakar, Anshuman Khandual, Balbir Singh, Benjamin Herrenschmidt, Cédric Le Goater, Christophe JAILLET, Christophe Leroy, Christopher M. Riedl, Christoph Hellwig, Claudio Carvalho, Daniel Axtens, David Gibson, David Hildenbrand, Desnes A. Nunes do Rosario, Ganesh Goudar, Gautham R. Shenoy, Greg Kurz, Guerney Hunt, Gustavo Romero, Halil Pasic, Hari Bathini, Joakim Tjernlund, Jonathan Neuschafer, Jordan Niethe, Leonardo Bras, Lianbo Jiang, Madhavan Srinivasan, Mahesh Salgaonkar, Mahesh Salgaonkar, Masahiro Yamada, Maxiwell S. Garcia, Michael Anderson, Nathan Chancellor, Nathan Lynch, Naveen N. Rao, Nicholas Piggin, Oliver O'Halloran, Qian Cai, Ram Pai, Ravi Bangoria, Reza Arbab, Ryan Grimm, Sam Bobroff, Santosh Sivaraj, Segher Boessenkool, Sukadev Bhattiprolu, Thiago Bauermann, Thiago Jung Bauermann, Thomas Gleixner, Tom Lendacky, Vasant Hegde. -----BEGIN PGP SIGNATURE----- iQJHBAABCAAxFiEEJFGtCPCthwEv2Y/bUevqPMjhpYAFAl2EtEcTHG1wZUBlbGxl cm1hbi5pZC5hdQAKCRBR6+o8yOGlgPfsD/9uXyBXn3anI/H08+mk74k5gCsmMQpn D442CD/ByogZcccp23yBTlhawtCE03hcHnCLygn0Xgd8a4YvHts/RGHUe3fPHqlG bEyZ7jsLVz5ebNZQP7r4eGs2pSzCajwJy2N9HJ/C1ojf15rrfRxoVJtnyhE2wXpm DL+6o2K+nUCB3gTQ1Inr3DnWzoGOOUfNTOea2u+J+yfHwGRqOBYpevwqiwy5eelK aRjUJCqMTvrzra49MeFwjo0Nt3/Y8UNcwA+JlGdeR8bRuWhFrYmyBRiZEKPaujNO 5EAfghBBlB0KQCqvF/tRM/c0OftHqK59AMobP9T7u9oOaBXeF/FpZX/iXjzNDPsN j9Oo2tKLTu/YVEXqBFuREGP+znANr1Wo4CFyOG8SbvYz0HFjR6XbtRJsS+0e8GWl kqX5/ZhYz3lBnKSNe9jgWOrh/J0KCSFigBTEWJT3xsn4YE8x8kK2l9KPqAIldWEP sKb2UjGS7v0NKq+NvShH88Q9AeQUEIjTcg/9aDDQDe6FaRQ7KiF8bUxSdwSPi+Fn j0lnF6i+1ATWZKuCr85veVi7C5qoe/+MqalnmP7MxULyzgXLLxUgN0SzEYO6QofK LQK/VaH2XVr5+M5YAb7K4/NX5gbM3s1bKrCiUy4EyHNvgG7gricYdbz6HgAjKpR7 oP0rHfgmVYvF1g== =WlW+ -----END PGP SIGNATURE----- Merge tag 'powerpc-5.4-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux Pull powerpc updates from Michael Ellerman: "This is a bit late, partly due to me travelling, and partly due to a power outage knocking out some of my test systems *while* I was travelling. - Initial support for running on a system with an Ultravisor, which is software that runs below the hypervisor and protects guests against some attacks by the hypervisor. - Support for building the kernel to run as a "Secure Virtual Machine", ie. as a guest capable of running on a system with an Ultravisor. - Some changes to our DMA code on bare metal, to allow devices with medium sized DMA masks (> 32 && < 59 bits) to use more than 2GB of DMA space. - Support for firmware assisted crash dumps on bare metal (powernv). - Two series fixing bugs in and refactoring our PCI EEH code. - A large series refactoring our exception entry code to use gas macros, both to make it more readable and also enable some future optimisations. As well as many cleanups and other minor features & fixups. Thanks to: Adam Zerella, Alexey Kardashevskiy, Alistair Popple, Andrew Donnellan, Aneesh Kumar K.V, Anju T Sudhakar, Anshuman Khandual, Balbir Singh, Benjamin Herrenschmidt, Cédric Le Goater, Christophe JAILLET, Christophe Leroy, Christopher M. Riedl, Christoph Hellwig, Claudio Carvalho, Daniel Axtens, David Gibson, David Hildenbrand, Desnes A. Nunes do Rosario, Ganesh Goudar, Gautham R. Shenoy, Greg Kurz, Guerney Hunt, Gustavo Romero, Halil Pasic, Hari Bathini, Joakim Tjernlund, Jonathan Neuschafer, Jordan Niethe, Leonardo Bras, Lianbo Jiang, Madhavan Srinivasan, Mahesh Salgaonkar, Mahesh Salgaonkar, Masahiro Yamada, Maxiwell S. Garcia, Michael Anderson, Nathan Chancellor, Nathan Lynch, Naveen N. Rao, Nicholas Piggin, Oliver O'Halloran, Qian Cai, Ram Pai, Ravi Bangoria, Reza Arbab, Ryan Grimm, Sam Bobroff, Santosh Sivaraj, Segher Boessenkool, Sukadev Bhattiprolu, Thiago Bauermann, Thiago Jung Bauermann, Thomas Gleixner, Tom Lendacky, Vasant Hegde" * tag 'powerpc-5.4-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (264 commits) powerpc/mm/mce: Keep irqs disabled during lockless page table walk powerpc: Use ftrace_graph_ret_addr() when unwinding powerpc/ftrace: Enable HAVE_FUNCTION_GRAPH_RET_ADDR_PTR ftrace: Look up the address of return_to_handler() using helpers powerpc: dump kernel log before carrying out fadump or kdump docs: powerpc: Add missing documentation reference powerpc/xmon: Fix output of XIVE IPI powerpc/xmon: Improve output of XIVE interrupts powerpc/mm/radix: remove useless kernel messages powerpc/fadump: support holes in kernel boot memory area powerpc/fadump: remove RMA_START and RMA_END macros powerpc/fadump: update documentation about option to release opalcore powerpc/fadump: consider f/w load area powerpc/opalcore: provide an option to invalidate /sys/firmware/opal/core file powerpc/opalcore: export /sys/firmware/opal/core for analysing opal crashes powerpc/fadump: update documentation about CONFIG_PRESERVE_FA_DUMP powerpc/fadump: add support to preserve crash data on FADUMP disabled kernel powerpc/fadump: improve how crashed kernel's memory is reserved powerpc/fadump: consider reserved ranges while releasing memory powerpc/fadump: make crash memory ranges array allocation generic ...
124 lines
3.2 KiB
C
124 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* PowerPC version derived from arch/arm/mm/consistent.c
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* Copyright (C) 2001 Dan Malek (dmalek@jlc.net)
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*
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* Copyright (C) 2000 Russell King
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/highmem.h>
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#include <linux/dma-direct.h>
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#include <linux/dma-noncoherent.h>
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#include <asm/tlbflush.h>
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#include <asm/dma.h>
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/*
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* make an area consistent.
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*/
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static void __dma_sync(void *vaddr, size_t size, int direction)
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{
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unsigned long start = (unsigned long)vaddr;
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unsigned long end = start + size;
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switch (direction) {
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case DMA_NONE:
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BUG();
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case DMA_FROM_DEVICE:
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/*
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* invalidate only when cache-line aligned otherwise there is
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* the potential for discarding uncommitted data from the cache
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*/
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if ((start | end) & (L1_CACHE_BYTES - 1))
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flush_dcache_range(start, end);
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else
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invalidate_dcache_range(start, end);
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break;
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case DMA_TO_DEVICE: /* writeback only */
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clean_dcache_range(start, end);
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break;
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case DMA_BIDIRECTIONAL: /* writeback and invalidate */
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flush_dcache_range(start, end);
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break;
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}
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}
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#ifdef CONFIG_HIGHMEM
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/*
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* __dma_sync_page() implementation for systems using highmem.
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* In this case, each page of a buffer must be kmapped/kunmapped
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* in order to have a virtual address for __dma_sync(). This must
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* not sleep so kmap_atomic()/kunmap_atomic() are used.
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*
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* Note: yes, it is possible and correct to have a buffer extend
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* beyond the first page.
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*/
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static inline void __dma_sync_page_highmem(struct page *page,
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unsigned long offset, size_t size, int direction)
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{
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size_t seg_size = min((size_t)(PAGE_SIZE - offset), size);
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size_t cur_size = seg_size;
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unsigned long flags, start, seg_offset = offset;
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int nr_segs = 1 + ((size - seg_size) + PAGE_SIZE - 1)/PAGE_SIZE;
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int seg_nr = 0;
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local_irq_save(flags);
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do {
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start = (unsigned long)kmap_atomic(page + seg_nr) + seg_offset;
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/* Sync this buffer segment */
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__dma_sync((void *)start, seg_size, direction);
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kunmap_atomic((void *)start);
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seg_nr++;
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/* Calculate next buffer segment size */
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seg_size = min((size_t)PAGE_SIZE, size - cur_size);
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/* Add the segment size to our running total */
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cur_size += seg_size;
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seg_offset = 0;
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} while (seg_nr < nr_segs);
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local_irq_restore(flags);
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}
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#endif /* CONFIG_HIGHMEM */
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/*
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* __dma_sync_page makes memory consistent. identical to __dma_sync, but
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* takes a struct page instead of a virtual address
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*/
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static void __dma_sync_page(phys_addr_t paddr, size_t size, int dir)
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{
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struct page *page = pfn_to_page(paddr >> PAGE_SHIFT);
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unsigned offset = paddr & ~PAGE_MASK;
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#ifdef CONFIG_HIGHMEM
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__dma_sync_page_highmem(page, offset, size, dir);
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#else
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unsigned long start = (unsigned long)page_address(page) + offset;
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__dma_sync((void *)start, size, dir);
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#endif
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}
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void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr,
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size_t size, enum dma_data_direction dir)
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{
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__dma_sync_page(paddr, size, dir);
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}
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void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr,
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size_t size, enum dma_data_direction dir)
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{
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__dma_sync_page(paddr, size, dir);
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}
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void arch_dma_prep_coherent(struct page *page, size_t size)
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{
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unsigned long kaddr = (unsigned long)page_address(page);
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flush_dcache_range(kaddr, kaddr + size);
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}
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