/* * mmap.c * * Copyright (C) 1995, 1996 by Volker Lendecke * Modified 1997 Peter Waltenberg, Bill Hawes, David Woodhouse for 2.1 dcache * */ #include #include #include #include #include #include #include #include #include #include #include #include #include "ncp_fs.h" /* * Fill in the supplied page for mmap * XXX: how are we excluding truncate/invalidate here? Maybe need to lock * page? */ static int ncp_file_mmap_fault(struct vm_area_struct *area, struct vm_fault *vmf) { struct inode *inode = file_inode(area->vm_file); char *pg_addr; unsigned int already_read; unsigned int count; int bufsize; int pos; /* XXX: loff_t ? */ /* * ncpfs has nothing against high pages as long * as recvmsg and memset works on it */ vmf->page = alloc_page(GFP_HIGHUSER); if (!vmf->page) return VM_FAULT_OOM; pg_addr = kmap(vmf->page); pos = vmf->pgoff << PAGE_SHIFT; count = PAGE_SIZE; /* what we can read in one go */ bufsize = NCP_SERVER(inode)->buffer_size; already_read = 0; if (ncp_make_open(inode, O_RDONLY) >= 0) { while (already_read < count) { int read_this_time; int to_read; to_read = bufsize - (pos % bufsize); to_read = min_t(unsigned int, to_read, count - already_read); if (ncp_read_kernel(NCP_SERVER(inode), NCP_FINFO(inode)->file_handle, pos, to_read, pg_addr + already_read, &read_this_time) != 0) { read_this_time = 0; } pos += read_this_time; already_read += read_this_time; if (read_this_time < to_read) { break; } } ncp_inode_close(inode); } if (already_read < PAGE_SIZE) memset(pg_addr + already_read, 0, PAGE_SIZE - already_read); flush_dcache_page(vmf->page); kunmap(vmf->page); /* * If I understand ncp_read_kernel() properly, the above always * fetches from the network, here the analogue of disk. * -- nyc */ count_vm_event(PGMAJFAULT); mem_cgroup_count_vm_event(area->vm_mm, PGMAJFAULT); return VM_FAULT_MAJOR; } static const struct vm_operations_struct ncp_file_mmap = { .fault = ncp_file_mmap_fault, }; /* This is used for a general mmap of a ncp file */ int ncp_mmap(struct file *file, struct vm_area_struct *vma) { struct inode *inode = file_inode(file); ncp_dbg(1, "called\n"); if (!ncp_conn_valid(NCP_SERVER(inode))) return -EIO; /* only PAGE_COW or read-only supported now */ if (vma->vm_flags & VM_SHARED) return -EINVAL; /* we do not support files bigger than 4GB... We eventually supports just 4GB... */ if (vma_pages(vma) + vma->vm_pgoff > (1U << (32 - PAGE_SHIFT))) return -EFBIG; vma->vm_ops = &ncp_file_mmap; file_accessed(file); return 0; } e9f7bcd8744ea25fcf0ac671b8d72c10d7d790'>root/tools/perf/pmu-events/arch/x86/broadwell
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authorBjorn Helgaas <bhelgaas@google.com>2016-12-28 14:55:16 -0600
committerBjorn Helgaas <bhelgaas@google.com>2017-01-11 09:11:15 -0600
commit89e9f7bcd8744ea25fcf0ac671b8d72c10d7d790 (patch)
treee941c52704b59bc7d5ffe0bbaa2d42b8fec8976a /tools/perf/pmu-events/arch/x86/broadwell
parenta782b5f986c3fa1cfa7f2b57941200c6a5809242 (diff)
x86/PCI: Ignore _CRS on Supermicro X8DTH-i/6/iF/6F
Martin reported that the Supermicro X8DTH-i/6/iF/6F advertises incorrect host bridge windows via _CRS: pci_root PNP0A08:00: host bridge window [io 0xf000-0xffff] pci_root PNP0A08:01: host bridge window [io 0xf000-0xffff] Both bridges advertise the 0xf000-0xffff window, which cannot be correct. Work around this by ignoring _CRS on this system. The downside is that we may not assign resources correctly to hot-added PCI devices (if they are possible on this system). Link: https://bugzilla.kernel.org/show_bug.cgi?id=42606 Reported-by: Martin Burnicki <martin.burnicki@meinberg.de> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> CC: stable@vger.kernel.org
Diffstat (limited to 'tools/perf/pmu-events/arch/x86/broadwell')