/* Copyright (c) 2013-2015 PLUMgrid, http://plumgrid.com * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. */ #include #include #include #include #include "bpf_helpers.h" struct bpf_map_def SEC("maps") my_map = { .type = BPF_MAP_TYPE_HASH, .key_size = sizeof(long), .value_size = sizeof(u64), .max_entries = 4096, }; /* kprobe is NOT a stable ABI. If kernel internals change this bpf+kprobe * example will no longer be meaningful */ SEC("kprobe/blk_start_request") int bpf_prog1(struct pt_regs *ctx) { long rq = PT_REGS_PARM1(ctx); u64 val = bpf_ktime_get_ns(); bpf_map_update_elem(&my_map, &rq, &val, BPF_ANY); return 0; } static unsigned int log2l(unsigned long long n) { #define S(k) if (n >= (1ull << k)) { i += k; n >>= k; } int i = -(n == 0); S(32); S(16); S(8); S(4); S(2); S(1); return i; #undef S } #define SLOTS 100 struct bpf_map_def SEC("maps") lat_map = { .type = BPF_MAP_TYPE_PERCPU_ARRAY, .key_size = sizeof(u32), .value_size = sizeof(u64), .max_entries = SLOTS, }; SEC("kprobe/blk_account_io_completion") int bpf_prog2(struct pt_regs *ctx) { long rq = PT_REGS_PARM1(ctx); u64 *value, l, base; u32 index; value = bpf_map_lookup_elem(&my_map, &rq); if (!value) return 0; u64 cur_time = bpf_ktime_get_ns(); u64 delta = cur_time - *value; bpf_map_delete_elem(&my_map, &rq); /* the lines below are computing index = log10(delta)*10 * using integer arithmetic * index = 29 ~ 1 usec * index = 59 ~ 1 msec * index = 89 ~ 1 sec * index = 99 ~ 10sec or more * log10(x)*10 = log2(x)*10/log2(10) = log2(x)*3 */ l = log2l(delta); base = 1ll << l; index = (l * 64 + (delta - base) * 64 / base) * 3 / 64; if (index >= SLOTS) index = SLOTS - 1; value = bpf_map_lookup_elem(&lat_map, &index); if (value) *value += 1; return 0; } char _license[] SEC("license") = "GPL"; u32 _version SEC("version") = LINUX_VERSION_CODE; d=dab780a3b489b038a47d8fbbc49c33aae1e7a682'>diff
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authorNicolae Rosia <Nicolae_Rosia@mentor.com>2016-11-12 14:42:14 +0200
committerMark Brown <broonie@kernel.org>2016-11-16 18:03:39 +0000
commitdab780a3b489b038a47d8fbbc49c33aae1e7a682 (patch)
treec9599a6970c187f95f7875d2a3e948f05cef1e45 /sound/usb/usx2y/us122l.h
parent1001354ca34179f3db924eb66672442a173147dc (diff)
regulator: twl-regulator: rework fixed regulator definition
TWL603X and TWL4030 are different and have different code logic. Rework the regulator definition method so we can split the file easily in twl4030 and twl6030. Signed-off-by: Nicolae Rosia <Nicolae_Rosia@mentor.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound/usb/usx2y/us122l.h')