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2182 lines
48 KiB
2182 lines
48 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Intel(R) Trace Hub Memory Storage Unit |
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* |
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* Copyright (C) 2014-2015 Intel Corporation. |
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*/ |
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|
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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|
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#include <linux/types.h> |
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#include <linux/module.h> |
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#include <linux/device.h> |
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#include <linux/uaccess.h> |
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#include <linux/sizes.h> |
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#include <linux/printk.h> |
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#include <linux/slab.h> |
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#include <linux/mm.h> |
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#include <linux/fs.h> |
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#include <linux/io.h> |
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#include <linux/workqueue.h> |
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#include <linux/dma-mapping.h> |
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|
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#ifdef CONFIG_X86 |
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#include <asm/set_memory.h> |
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#endif |
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|
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#include <linux/intel_th.h> |
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#include "intel_th.h" |
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#include "msu.h" |
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|
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#define msc_dev(x) (&(x)->thdev->dev) |
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|
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/* |
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* Lockout state transitions: |
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* READY -> INUSE -+-> LOCKED -+-> READY -> etc. |
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* \-----------/ |
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* WIN_READY: window can be used by HW |
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* WIN_INUSE: window is in use |
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* WIN_LOCKED: window is filled up and is being processed by the buffer |
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* handling code |
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* |
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* All state transitions happen automatically, except for the LOCKED->READY, |
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* which needs to be signalled by the buffer code by calling |
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* intel_th_msc_window_unlock(). |
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* |
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* When the interrupt handler has to switch to the next window, it checks |
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* whether it's READY, and if it is, it performs the switch and tracing |
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* continues. If it's LOCKED, it stops the trace. |
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*/ |
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enum lockout_state { |
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WIN_READY = 0, |
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WIN_INUSE, |
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WIN_LOCKED |
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}; |
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|
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/** |
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* struct msc_window - multiblock mode window descriptor |
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* @entry: window list linkage (msc::win_list) |
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* @pgoff: page offset into the buffer that this window starts at |
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* @lockout: lockout state, see comment below |
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* @lo_lock: lockout state serialization |
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* @nr_blocks: number of blocks (pages) in this window |
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* @nr_segs: number of segments in this window (<= @nr_blocks) |
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* @_sgt: array of block descriptors |
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* @sgt: array of block descriptors |
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*/ |
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struct msc_window { |
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struct list_head entry; |
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unsigned long pgoff; |
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enum lockout_state lockout; |
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spinlock_t lo_lock; |
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unsigned int nr_blocks; |
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unsigned int nr_segs; |
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struct msc *msc; |
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struct sg_table _sgt; |
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struct sg_table *sgt; |
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}; |
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|
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/** |
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* struct msc_iter - iterator for msc buffer |
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* @entry: msc::iter_list linkage |
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* @msc: pointer to the MSC device |
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* @start_win: oldest window |
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* @win: current window |
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* @offset: current logical offset into the buffer |
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* @start_block: oldest block in the window |
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* @block: block number in the window |
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* @block_off: offset into current block |
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* @wrap_count: block wrapping handling |
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* @eof: end of buffer reached |
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*/ |
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struct msc_iter { |
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struct list_head entry; |
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struct msc *msc; |
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struct msc_window *start_win; |
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struct msc_window *win; |
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unsigned long offset; |
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struct scatterlist *start_block; |
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struct scatterlist *block; |
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unsigned int block_off; |
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unsigned int wrap_count; |
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unsigned int eof; |
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}; |
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|
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/** |
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* struct msc - MSC device representation |
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* @reg_base: register window base address |
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* @thdev: intel_th_device pointer |
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* @mbuf: MSU buffer, if assigned |
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* @mbuf_priv MSU buffer's private data, if @mbuf |
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* @win_list: list of windows in multiblock mode |
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* @single_sgt: single mode buffer |
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* @cur_win: current window |
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* @nr_pages: total number of pages allocated for this buffer |
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* @single_sz: amount of data in single mode |
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* @single_wrap: single mode wrap occurred |
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* @base: buffer's base pointer |
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* @base_addr: buffer's base address |
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* @user_count: number of users of the buffer |
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* @mmap_count: number of mappings |
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* @buf_mutex: mutex to serialize access to buffer-related bits |
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|
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* @enabled: MSC is enabled |
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* @wrap: wrapping is enabled |
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* @mode: MSC operating mode |
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* @burst_len: write burst length |
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* @index: number of this MSC in the MSU |
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*/ |
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struct msc { |
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void __iomem *reg_base; |
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void __iomem *msu_base; |
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struct intel_th_device *thdev; |
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|
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const struct msu_buffer *mbuf; |
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void *mbuf_priv; |
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|
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struct work_struct work; |
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struct list_head win_list; |
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struct sg_table single_sgt; |
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struct msc_window *cur_win; |
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struct msc_window *switch_on_unlock; |
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unsigned long nr_pages; |
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unsigned long single_sz; |
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unsigned int single_wrap : 1; |
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void *base; |
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dma_addr_t base_addr; |
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u32 orig_addr; |
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u32 orig_sz; |
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|
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/* <0: no buffer, 0: no users, >0: active users */ |
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atomic_t user_count; |
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|
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atomic_t mmap_count; |
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struct mutex buf_mutex; |
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|
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struct list_head iter_list; |
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|
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bool stop_on_full; |
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|
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/* config */ |
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unsigned int enabled : 1, |
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wrap : 1, |
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do_irq : 1, |
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multi_is_broken : 1; |
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unsigned int mode; |
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unsigned int burst_len; |
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unsigned int index; |
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}; |
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|
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static LIST_HEAD(msu_buffer_list); |
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static DEFINE_MUTEX(msu_buffer_mutex); |
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|
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/** |
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* struct msu_buffer_entry - internal MSU buffer bookkeeping |
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* @entry: link to msu_buffer_list |
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* @mbuf: MSU buffer object |
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* @owner: module that provides this MSU buffer |
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*/ |
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struct msu_buffer_entry { |
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struct list_head entry; |
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const struct msu_buffer *mbuf; |
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struct module *owner; |
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}; |
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static struct msu_buffer_entry *__msu_buffer_entry_find(const char *name) |
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{ |
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struct msu_buffer_entry *mbe; |
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|
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lockdep_assert_held(&msu_buffer_mutex); |
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|
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list_for_each_entry(mbe, &msu_buffer_list, entry) { |
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if (!strcmp(mbe->mbuf->name, name)) |
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return mbe; |
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} |
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|
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return NULL; |
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} |
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static const struct msu_buffer * |
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msu_buffer_get(const char *name) |
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{ |
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struct msu_buffer_entry *mbe; |
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|
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mutex_lock(&msu_buffer_mutex); |
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mbe = __msu_buffer_entry_find(name); |
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if (mbe && !try_module_get(mbe->owner)) |
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mbe = NULL; |
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mutex_unlock(&msu_buffer_mutex); |
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|
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return mbe ? mbe->mbuf : NULL; |
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} |
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|
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static void msu_buffer_put(const struct msu_buffer *mbuf) |
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{ |
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struct msu_buffer_entry *mbe; |
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|
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mutex_lock(&msu_buffer_mutex); |
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mbe = __msu_buffer_entry_find(mbuf->name); |
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if (mbe) |
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module_put(mbe->owner); |
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mutex_unlock(&msu_buffer_mutex); |
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} |
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|
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int intel_th_msu_buffer_register(const struct msu_buffer *mbuf, |
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struct module *owner) |
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{ |
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struct msu_buffer_entry *mbe; |
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int ret = 0; |
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mbe = kzalloc(sizeof(*mbe), GFP_KERNEL); |
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if (!mbe) |
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return -ENOMEM; |
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|
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mutex_lock(&msu_buffer_mutex); |
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if (__msu_buffer_entry_find(mbuf->name)) { |
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ret = -EEXIST; |
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kfree(mbe); |
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goto unlock; |
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} |
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|
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mbe->mbuf = mbuf; |
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mbe->owner = owner; |
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list_add_tail(&mbe->entry, &msu_buffer_list); |
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unlock: |
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mutex_unlock(&msu_buffer_mutex); |
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|
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(intel_th_msu_buffer_register); |
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|
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void intel_th_msu_buffer_unregister(const struct msu_buffer *mbuf) |
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{ |
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struct msu_buffer_entry *mbe; |
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|
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mutex_lock(&msu_buffer_mutex); |
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mbe = __msu_buffer_entry_find(mbuf->name); |
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if (mbe) { |
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list_del(&mbe->entry); |
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kfree(mbe); |
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} |
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mutex_unlock(&msu_buffer_mutex); |
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} |
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EXPORT_SYMBOL_GPL(intel_th_msu_buffer_unregister); |
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|
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static inline bool msc_block_is_empty(struct msc_block_desc *bdesc) |
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{ |
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/* header hasn't been written */ |
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if (!bdesc->valid_dw) |
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return true; |
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|
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/* valid_dw includes the header */ |
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if (!msc_data_sz(bdesc)) |
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return true; |
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|
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return false; |
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} |
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static inline struct scatterlist *msc_win_base_sg(struct msc_window *win) |
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{ |
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return win->sgt->sgl; |
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} |
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static inline struct msc_block_desc *msc_win_base(struct msc_window *win) |
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{ |
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return sg_virt(msc_win_base_sg(win)); |
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} |
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|
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static inline dma_addr_t msc_win_base_dma(struct msc_window *win) |
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{ |
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return sg_dma_address(msc_win_base_sg(win)); |
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} |
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|
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static inline unsigned long |
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msc_win_base_pfn(struct msc_window *win) |
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{ |
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return PFN_DOWN(msc_win_base_dma(win)); |
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} |
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|
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/** |
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* msc_is_last_win() - check if a window is the last one for a given MSC |
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* @win: window |
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* Return: true if @win is the last window in MSC's multiblock buffer |
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*/ |
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static inline bool msc_is_last_win(struct msc_window *win) |
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{ |
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return win->entry.next == &win->msc->win_list; |
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} |
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|
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/** |
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* msc_next_window() - return next window in the multiblock buffer |
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* @win: current window |
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* |
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* Return: window following the current one |
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*/ |
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static struct msc_window *msc_next_window(struct msc_window *win) |
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{ |
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if (msc_is_last_win(win)) |
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return list_first_entry(&win->msc->win_list, struct msc_window, |
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entry); |
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return list_next_entry(win, entry); |
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} |
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static size_t msc_win_total_sz(struct msc_window *win) |
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{ |
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struct scatterlist *sg; |
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unsigned int blk; |
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size_t size = 0; |
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|
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for_each_sg(win->sgt->sgl, sg, win->nr_segs, blk) { |
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struct msc_block_desc *bdesc = sg_virt(sg); |
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if (msc_block_wrapped(bdesc)) |
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return (size_t)win->nr_blocks << PAGE_SHIFT; |
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size += msc_total_sz(bdesc); |
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if (msc_block_last_written(bdesc)) |
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break; |
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} |
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return size; |
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} |
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|
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/** |
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* msc_find_window() - find a window matching a given sg_table |
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* @msc: MSC device |
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* @sgt: SG table of the window |
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* @nonempty: skip over empty windows |
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* |
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* Return: MSC window structure pointer or NULL if the window |
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* could not be found. |
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*/ |
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static struct msc_window * |
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msc_find_window(struct msc *msc, struct sg_table *sgt, bool nonempty) |
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{ |
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struct msc_window *win; |
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unsigned int found = 0; |
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|
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if (list_empty(&msc->win_list)) |
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return NULL; |
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|
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/* |
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* we might need a radix tree for this, depending on how |
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* many windows a typical user would allocate; ideally it's |
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* something like 2, in which case we're good |
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*/ |
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list_for_each_entry(win, &msc->win_list, entry) { |
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if (win->sgt == sgt) |
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found++; |
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|
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/* skip the empty ones */ |
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if (nonempty && msc_block_is_empty(msc_win_base(win))) |
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continue; |
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|
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if (found) |
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return win; |
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} |
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|
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return NULL; |
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} |
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|
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/** |
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* msc_oldest_window() - locate the window with oldest data |
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* @msc: MSC device |
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* |
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* This should only be used in multiblock mode. Caller should hold the |
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* msc::user_count reference. |
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* |
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* Return: the oldest window with valid data |
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*/ |
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static struct msc_window *msc_oldest_window(struct msc *msc) |
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{ |
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struct msc_window *win; |
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|
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if (list_empty(&msc->win_list)) |
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return NULL; |
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|
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win = msc_find_window(msc, msc_next_window(msc->cur_win)->sgt, true); |
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if (win) |
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return win; |
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return list_first_entry(&msc->win_list, struct msc_window, entry); |
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} |
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|
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/** |
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* msc_win_oldest_sg() - locate the oldest block in a given window |
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* @win: window to look at |
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* |
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* Return: index of the block with the oldest data |
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*/ |
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static struct scatterlist *msc_win_oldest_sg(struct msc_window *win) |
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{ |
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unsigned int blk; |
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struct scatterlist *sg; |
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struct msc_block_desc *bdesc = msc_win_base(win); |
|
|
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/* without wrapping, first block is the oldest */ |
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if (!msc_block_wrapped(bdesc)) |
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return msc_win_base_sg(win); |
|
|
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/* |
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* with wrapping, last written block contains both the newest and the |
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* oldest data for this window. |
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*/ |
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for_each_sg(win->sgt->sgl, sg, win->nr_segs, blk) { |
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struct msc_block_desc *bdesc = sg_virt(sg); |
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|
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if (msc_block_last_written(bdesc)) |
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return sg; |
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} |
|
|
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return msc_win_base_sg(win); |
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} |
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|
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static struct msc_block_desc *msc_iter_bdesc(struct msc_iter *iter) |
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{ |
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return sg_virt(iter->block); |
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} |
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|
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static struct msc_iter *msc_iter_install(struct msc *msc) |
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{ |
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struct msc_iter *iter; |
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|
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iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
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if (!iter) |
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return ERR_PTR(-ENOMEM); |
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|
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mutex_lock(&msc->buf_mutex); |
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|
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/* |
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* Reading and tracing are mutually exclusive; if msc is |
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* enabled, open() will fail; otherwise existing readers |
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* will prevent enabling the msc and the rest of fops don't |
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* need to worry about it. |
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*/ |
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if (msc->enabled) { |
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kfree(iter); |
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iter = ERR_PTR(-EBUSY); |
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goto unlock; |
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} |
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|
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iter->msc = msc; |
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|
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list_add_tail(&iter->entry, &msc->iter_list); |
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unlock: |
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mutex_unlock(&msc->buf_mutex); |
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|
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return iter; |
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} |
|
|
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static void msc_iter_remove(struct msc_iter *iter, struct msc *msc) |
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{ |
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mutex_lock(&msc->buf_mutex); |
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list_del(&iter->entry); |
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mutex_unlock(&msc->buf_mutex); |
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|
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kfree(iter); |
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} |
|
|
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static void msc_iter_block_start(struct msc_iter *iter) |
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{ |
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if (iter->start_block) |
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return; |
|
|
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iter->start_block = msc_win_oldest_sg(iter->win); |
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iter->block = iter->start_block; |
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iter->wrap_count = 0; |
|
|
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/* |
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* start with the block with oldest data; if data has wrapped |
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* in this window, it should be in this block |
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*/ |
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if (msc_block_wrapped(msc_iter_bdesc(iter))) |
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iter->wrap_count = 2; |
|
|
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} |
|
|
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static int msc_iter_win_start(struct msc_iter *iter, struct msc *msc) |
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{ |
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/* already started, nothing to do */ |
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if (iter->start_win) |
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return 0; |
|
|
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iter->start_win = msc_oldest_window(msc); |
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if (!iter->start_win) |
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return -EINVAL; |
|
|
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iter->win = iter->start_win; |
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iter->start_block = NULL; |
|
|
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msc_iter_block_start(iter); |
|
|
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return 0; |
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} |
|
|
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static int msc_iter_win_advance(struct msc_iter *iter) |
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{ |
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iter->win = msc_next_window(iter->win); |
|
iter->start_block = NULL; |
|
|
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if (iter->win == iter->start_win) { |
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iter->eof++; |
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return 1; |
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} |
|
|
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msc_iter_block_start(iter); |
|
|
|
return 0; |
|
} |
|
|
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static int msc_iter_block_advance(struct msc_iter *iter) |
|
{ |
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iter->block_off = 0; |
|
|
|
/* wrapping */ |
|
if (iter->wrap_count && iter->block == iter->start_block) { |
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iter->wrap_count--; |
|
if (!iter->wrap_count) |
|
/* copied newest data from the wrapped block */ |
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return msc_iter_win_advance(iter); |
|
} |
|
|
|
/* no wrapping, check for last written block */ |
|
if (!iter->wrap_count && msc_block_last_written(msc_iter_bdesc(iter))) |
|
/* copied newest data for the window */ |
|
return msc_iter_win_advance(iter); |
|
|
|
/* block advance */ |
|
if (sg_is_last(iter->block)) |
|
iter->block = msc_win_base_sg(iter->win); |
|
else |
|
iter->block = sg_next(iter->block); |
|
|
|
/* no wrapping, sanity check in case there is no last written block */ |
|
if (!iter->wrap_count && iter->block == iter->start_block) |
|
return msc_iter_win_advance(iter); |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* msc_buffer_iterate() - go through multiblock buffer's data |
|
* @iter: iterator structure |
|
* @size: amount of data to scan |
|
* @data: callback's private data |
|
* @fn: iterator callback |
|
* |
|
* This will start at the window which will be written to next (containing |
|
* the oldest data) and work its way to the current window, calling @fn |
|
* for each chunk of data as it goes. |
|
* |
|
* Caller should have msc::user_count reference to make sure the buffer |
|
* doesn't disappear from under us. |
|
* |
|
* Return: amount of data actually scanned. |
|
*/ |
|
static ssize_t |
|
msc_buffer_iterate(struct msc_iter *iter, size_t size, void *data, |
|
unsigned long (*fn)(void *, void *, size_t)) |
|
{ |
|
struct msc *msc = iter->msc; |
|
size_t len = size; |
|
unsigned int advance; |
|
|
|
if (iter->eof) |
|
return 0; |
|
|
|
/* start with the oldest window */ |
|
if (msc_iter_win_start(iter, msc)) |
|
return 0; |
|
|
|
do { |
|
unsigned long data_bytes = msc_data_sz(msc_iter_bdesc(iter)); |
|
void *src = (void *)msc_iter_bdesc(iter) + MSC_BDESC; |
|
size_t tocopy = data_bytes, copied = 0; |
|
size_t remaining = 0; |
|
|
|
advance = 1; |
|
|
|
/* |
|
* If block wrapping happened, we need to visit the last block |
|
* twice, because it contains both the oldest and the newest |
|
* data in this window. |
|
* |
|
* First time (wrap_count==2), in the very beginning, to collect |
|
* the oldest data, which is in the range |
|
* (data_bytes..DATA_IN_PAGE). |
|
* |
|
* Second time (wrap_count==1), it's just like any other block, |
|
* containing data in the range of [MSC_BDESC..data_bytes]. |
|
*/ |
|
if (iter->block == iter->start_block && iter->wrap_count == 2) { |
|
tocopy = DATA_IN_PAGE - data_bytes; |
|
src += data_bytes; |
|
} |
|
|
|
if (!tocopy) |
|
goto next_block; |
|
|
|
tocopy -= iter->block_off; |
|
src += iter->block_off; |
|
|
|
if (len < tocopy) { |
|
tocopy = len; |
|
advance = 0; |
|
} |
|
|
|
remaining = fn(data, src, tocopy); |
|
|
|
if (remaining) |
|
advance = 0; |
|
|
|
copied = tocopy - remaining; |
|
len -= copied; |
|
iter->block_off += copied; |
|
iter->offset += copied; |
|
|
|
if (!advance) |
|
break; |
|
|
|
next_block: |
|
if (msc_iter_block_advance(iter)) |
|
break; |
|
|
|
} while (len); |
|
|
|
return size - len; |
|
} |
|
|
|
/** |
|
* msc_buffer_clear_hw_header() - clear hw header for multiblock |
|
* @msc: MSC device |
|
*/ |
|
static void msc_buffer_clear_hw_header(struct msc *msc) |
|
{ |
|
struct msc_window *win; |
|
struct scatterlist *sg; |
|
|
|
list_for_each_entry(win, &msc->win_list, entry) { |
|
unsigned int blk; |
|
size_t hw_sz = sizeof(struct msc_block_desc) - |
|
offsetof(struct msc_block_desc, hw_tag); |
|
|
|
for_each_sg(win->sgt->sgl, sg, win->nr_segs, blk) { |
|
struct msc_block_desc *bdesc = sg_virt(sg); |
|
|
|
memset(&bdesc->hw_tag, 0, hw_sz); |
|
} |
|
} |
|
} |
|
|
|
static int intel_th_msu_init(struct msc *msc) |
|
{ |
|
u32 mintctl, msusts; |
|
|
|
if (!msc->do_irq) |
|
return 0; |
|
|
|
if (!msc->mbuf) |
|
return 0; |
|
|
|
mintctl = ioread32(msc->msu_base + REG_MSU_MINTCTL); |
|
mintctl |= msc->index ? M1BLIE : M0BLIE; |
|
iowrite32(mintctl, msc->msu_base + REG_MSU_MINTCTL); |
|
if (mintctl != ioread32(msc->msu_base + REG_MSU_MINTCTL)) { |
|
dev_info(msc_dev(msc), "MINTCTL ignores writes: no usable interrupts\n"); |
|
msc->do_irq = 0; |
|
return 0; |
|
} |
|
|
|
msusts = ioread32(msc->msu_base + REG_MSU_MSUSTS); |
|
iowrite32(msusts, msc->msu_base + REG_MSU_MSUSTS); |
|
|
|
return 0; |
|
} |
|
|
|
static void intel_th_msu_deinit(struct msc *msc) |
|
{ |
|
u32 mintctl; |
|
|
|
if (!msc->do_irq) |
|
return; |
|
|
|
mintctl = ioread32(msc->msu_base + REG_MSU_MINTCTL); |
|
mintctl &= msc->index ? ~M1BLIE : ~M0BLIE; |
|
iowrite32(mintctl, msc->msu_base + REG_MSU_MINTCTL); |
|
} |
|
|
|
static int msc_win_set_lockout(struct msc_window *win, |
|
enum lockout_state expect, |
|
enum lockout_state new) |
|
{ |
|
enum lockout_state old; |
|
unsigned long flags; |
|
int ret = 0; |
|
|
|
if (!win->msc->mbuf) |
|
return 0; |
|
|
|
spin_lock_irqsave(&win->lo_lock, flags); |
|
old = win->lockout; |
|
|
|
if (old != expect) { |
|
ret = -EINVAL; |
|
goto unlock; |
|
} |
|
|
|
win->lockout = new; |
|
|
|
if (old == expect && new == WIN_LOCKED) |
|
atomic_inc(&win->msc->user_count); |
|
else if (old == expect && old == WIN_LOCKED) |
|
atomic_dec(&win->msc->user_count); |
|
|
|
unlock: |
|
spin_unlock_irqrestore(&win->lo_lock, flags); |
|
|
|
if (ret) { |
|
if (expect == WIN_READY && old == WIN_LOCKED) |
|
return -EBUSY; |
|
|
|
/* from intel_th_msc_window_unlock(), don't warn if not locked */ |
|
if (expect == WIN_LOCKED && old == new) |
|
return 0; |
|
|
|
dev_warn_ratelimited(msc_dev(win->msc), |
|
"expected lockout state %d, got %d\n", |
|
expect, old); |
|
} |
|
|
|
return ret; |
|
} |
|
/** |
|
* msc_configure() - set up MSC hardware |
|
* @msc: the MSC device to configure |
|
* |
|
* Program storage mode, wrapping, burst length and trace buffer address |
|
* into a given MSC. Then, enable tracing and set msc::enabled. |
|
* The latter is serialized on msc::buf_mutex, so make sure to hold it. |
|
*/ |
|
static int msc_configure(struct msc *msc) |
|
{ |
|
u32 reg; |
|
|
|
lockdep_assert_held(&msc->buf_mutex); |
|
|
|
if (msc->mode > MSC_MODE_MULTI) |
|
return -EINVAL; |
|
|
|
if (msc->mode == MSC_MODE_MULTI) { |
|
if (msc_win_set_lockout(msc->cur_win, WIN_READY, WIN_INUSE)) |
|
return -EBUSY; |
|
|
|
msc_buffer_clear_hw_header(msc); |
|
} |
|
|
|
msc->orig_addr = ioread32(msc->reg_base + REG_MSU_MSC0BAR); |
|
msc->orig_sz = ioread32(msc->reg_base + REG_MSU_MSC0SIZE); |
|
|
|
reg = msc->base_addr >> PAGE_SHIFT; |
|
iowrite32(reg, msc->reg_base + REG_MSU_MSC0BAR); |
|
|
|
if (msc->mode == MSC_MODE_SINGLE) { |
|
reg = msc->nr_pages; |
|
iowrite32(reg, msc->reg_base + REG_MSU_MSC0SIZE); |
|
} |
|
|
|
reg = ioread32(msc->reg_base + REG_MSU_MSC0CTL); |
|
reg &= ~(MSC_MODE | MSC_WRAPEN | MSC_EN | MSC_RD_HDR_OVRD); |
|
|
|
reg |= MSC_EN; |
|
reg |= msc->mode << __ffs(MSC_MODE); |
|
reg |= msc->burst_len << __ffs(MSC_LEN); |
|
|
|
if (msc->wrap) |
|
reg |= MSC_WRAPEN; |
|
|
|
iowrite32(reg, msc->reg_base + REG_MSU_MSC0CTL); |
|
|
|
intel_th_msu_init(msc); |
|
|
|
msc->thdev->output.multiblock = msc->mode == MSC_MODE_MULTI; |
|
intel_th_trace_enable(msc->thdev); |
|
msc->enabled = 1; |
|
|
|
if (msc->mbuf && msc->mbuf->activate) |
|
msc->mbuf->activate(msc->mbuf_priv); |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* msc_disable() - disable MSC hardware |
|
* @msc: MSC device to disable |
|
* |
|
* If @msc is enabled, disable tracing on the switch and then disable MSC |
|
* storage. Caller must hold msc::buf_mutex. |
|
*/ |
|
static void msc_disable(struct msc *msc) |
|
{ |
|
struct msc_window *win = msc->cur_win; |
|
u32 reg; |
|
|
|
lockdep_assert_held(&msc->buf_mutex); |
|
|
|
if (msc->mode == MSC_MODE_MULTI) |
|
msc_win_set_lockout(win, WIN_INUSE, WIN_LOCKED); |
|
|
|
if (msc->mbuf && msc->mbuf->deactivate) |
|
msc->mbuf->deactivate(msc->mbuf_priv); |
|
intel_th_msu_deinit(msc); |
|
intel_th_trace_disable(msc->thdev); |
|
|
|
if (msc->mode == MSC_MODE_SINGLE) { |
|
reg = ioread32(msc->reg_base + REG_MSU_MSC0STS); |
|
msc->single_wrap = !!(reg & MSCSTS_WRAPSTAT); |
|
|
|
reg = ioread32(msc->reg_base + REG_MSU_MSC0MWP); |
|
msc->single_sz = reg & ((msc->nr_pages << PAGE_SHIFT) - 1); |
|
dev_dbg(msc_dev(msc), "MSCnMWP: %08x/%08lx, wrap: %d\n", |
|
reg, msc->single_sz, msc->single_wrap); |
|
} |
|
|
|
reg = ioread32(msc->reg_base + REG_MSU_MSC0CTL); |
|
reg &= ~MSC_EN; |
|
iowrite32(reg, msc->reg_base + REG_MSU_MSC0CTL); |
|
|
|
if (msc->mbuf && msc->mbuf->ready) |
|
msc->mbuf->ready(msc->mbuf_priv, win->sgt, |
|
msc_win_total_sz(win)); |
|
|
|
msc->enabled = 0; |
|
|
|
iowrite32(msc->orig_addr, msc->reg_base + REG_MSU_MSC0BAR); |
|
iowrite32(msc->orig_sz, msc->reg_base + REG_MSU_MSC0SIZE); |
|
|
|
dev_dbg(msc_dev(msc), "MSCnNWSA: %08x\n", |
|
ioread32(msc->reg_base + REG_MSU_MSC0NWSA)); |
|
|
|
reg = ioread32(msc->reg_base + REG_MSU_MSC0STS); |
|
dev_dbg(msc_dev(msc), "MSCnSTS: %08x\n", reg); |
|
|
|
reg = ioread32(msc->reg_base + REG_MSU_MSUSTS); |
|
reg &= msc->index ? MSUSTS_MSC1BLAST : MSUSTS_MSC0BLAST; |
|
iowrite32(reg, msc->reg_base + REG_MSU_MSUSTS); |
|
} |
|
|
|
static int intel_th_msc_activate(struct intel_th_device *thdev) |
|
{ |
|
struct msc *msc = dev_get_drvdata(&thdev->dev); |
|
int ret = -EBUSY; |
|
|
|
if (!atomic_inc_unless_negative(&msc->user_count)) |
|
return -ENODEV; |
|
|
|
mutex_lock(&msc->buf_mutex); |
|
|
|
/* if there are readers, refuse */ |
|
if (list_empty(&msc->iter_list)) |
|
ret = msc_configure(msc); |
|
|
|
mutex_unlock(&msc->buf_mutex); |
|
|
|
if (ret) |
|
atomic_dec(&msc->user_count); |
|
|
|
return ret; |
|
} |
|
|
|
static void intel_th_msc_deactivate(struct intel_th_device *thdev) |
|
{ |
|
struct msc *msc = dev_get_drvdata(&thdev->dev); |
|
|
|
mutex_lock(&msc->buf_mutex); |
|
if (msc->enabled) { |
|
msc_disable(msc); |
|
atomic_dec(&msc->user_count); |
|
} |
|
mutex_unlock(&msc->buf_mutex); |
|
} |
|
|
|
/** |
|
* msc_buffer_contig_alloc() - allocate a contiguous buffer for SINGLE mode |
|
* @msc: MSC device |
|
* @size: allocation size in bytes |
|
* |
|
* This modifies msc::base, which requires msc::buf_mutex to serialize, so the |
|
* caller is expected to hold it. |
|
* |
|
* Return: 0 on success, -errno otherwise. |
|
*/ |
|
static int msc_buffer_contig_alloc(struct msc *msc, unsigned long size) |
|
{ |
|
unsigned long nr_pages = size >> PAGE_SHIFT; |
|
unsigned int order = get_order(size); |
|
struct page *page; |
|
int ret; |
|
|
|
if (!size) |
|
return 0; |
|
|
|
ret = sg_alloc_table(&msc->single_sgt, 1, GFP_KERNEL); |
|
if (ret) |
|
goto err_out; |
|
|
|
ret = -ENOMEM; |
|
page = alloc_pages(GFP_KERNEL | __GFP_ZERO | GFP_DMA32, order); |
|
if (!page) |
|
goto err_free_sgt; |
|
|
|
split_page(page, order); |
|
sg_set_buf(msc->single_sgt.sgl, page_address(page), size); |
|
|
|
ret = dma_map_sg(msc_dev(msc)->parent->parent, msc->single_sgt.sgl, 1, |
|
DMA_FROM_DEVICE); |
|
if (ret < 0) |
|
goto err_free_pages; |
|
|
|
msc->nr_pages = nr_pages; |
|
msc->base = page_address(page); |
|
msc->base_addr = sg_dma_address(msc->single_sgt.sgl); |
|
|
|
return 0; |
|
|
|
err_free_pages: |
|
__free_pages(page, order); |
|
|
|
err_free_sgt: |
|
sg_free_table(&msc->single_sgt); |
|
|
|
err_out: |
|
return ret; |
|
} |
|
|
|
/** |
|
* msc_buffer_contig_free() - free a contiguous buffer |
|
* @msc: MSC configured in SINGLE mode |
|
*/ |
|
static void msc_buffer_contig_free(struct msc *msc) |
|
{ |
|
unsigned long off; |
|
|
|
dma_unmap_sg(msc_dev(msc)->parent->parent, msc->single_sgt.sgl, |
|
1, DMA_FROM_DEVICE); |
|
sg_free_table(&msc->single_sgt); |
|
|
|
for (off = 0; off < msc->nr_pages << PAGE_SHIFT; off += PAGE_SIZE) { |
|
struct page *page = virt_to_page(msc->base + off); |
|
|
|
page->mapping = NULL; |
|
__free_page(page); |
|
} |
|
|
|
msc->nr_pages = 0; |
|
} |
|
|
|
/** |
|
* msc_buffer_contig_get_page() - find a page at a given offset |
|
* @msc: MSC configured in SINGLE mode |
|
* @pgoff: page offset |
|
* |
|
* Return: page, if @pgoff is within the range, NULL otherwise. |
|
*/ |
|
static struct page *msc_buffer_contig_get_page(struct msc *msc, |
|
unsigned long pgoff) |
|
{ |
|
if (pgoff >= msc->nr_pages) |
|
return NULL; |
|
|
|
return virt_to_page(msc->base + (pgoff << PAGE_SHIFT)); |
|
} |
|
|
|
static int __msc_buffer_win_alloc(struct msc_window *win, |
|
unsigned int nr_segs) |
|
{ |
|
struct scatterlist *sg_ptr; |
|
void *block; |
|
int i, ret; |
|
|
|
ret = sg_alloc_table(win->sgt, nr_segs, GFP_KERNEL); |
|
if (ret) |
|
return -ENOMEM; |
|
|
|
for_each_sg(win->sgt->sgl, sg_ptr, nr_segs, i) { |
|
block = dma_alloc_coherent(msc_dev(win->msc)->parent->parent, |
|
PAGE_SIZE, &sg_dma_address(sg_ptr), |
|
GFP_KERNEL); |
|
if (!block) |
|
goto err_nomem; |
|
|
|
sg_set_buf(sg_ptr, block, PAGE_SIZE); |
|
} |
|
|
|
return nr_segs; |
|
|
|
err_nomem: |
|
for_each_sg(win->sgt->sgl, sg_ptr, i, ret) |
|
dma_free_coherent(msc_dev(win->msc)->parent->parent, PAGE_SIZE, |
|
sg_virt(sg_ptr), sg_dma_address(sg_ptr)); |
|
|
|
sg_free_table(win->sgt); |
|
|
|
return -ENOMEM; |
|
} |
|
|
|
#ifdef CONFIG_X86 |
|
static void msc_buffer_set_uc(struct msc_window *win, unsigned int nr_segs) |
|
{ |
|
struct scatterlist *sg_ptr; |
|
int i; |
|
|
|
for_each_sg(win->sgt->sgl, sg_ptr, nr_segs, i) { |
|
/* Set the page as uncached */ |
|
set_memory_uc((unsigned long)sg_virt(sg_ptr), |
|
PFN_DOWN(sg_ptr->length)); |
|
} |
|
} |
|
|
|
static void msc_buffer_set_wb(struct msc_window *win) |
|
{ |
|
struct scatterlist *sg_ptr; |
|
int i; |
|
|
|
for_each_sg(win->sgt->sgl, sg_ptr, win->nr_segs, i) { |
|
/* Reset the page to write-back */ |
|
set_memory_wb((unsigned long)sg_virt(sg_ptr), |
|
PFN_DOWN(sg_ptr->length)); |
|
} |
|
} |
|
#else /* !X86 */ |
|
static inline void |
|
msc_buffer_set_uc(struct msc_window *win, unsigned int nr_segs) {} |
|
static inline void msc_buffer_set_wb(struct msc_window *win) {} |
|
#endif /* CONFIG_X86 */ |
|
|
|
/** |
|
* msc_buffer_win_alloc() - alloc a window for a multiblock mode |
|
* @msc: MSC device |
|
* @nr_blocks: number of pages in this window |
|
* |
|
* This modifies msc::win_list and msc::base, which requires msc::buf_mutex |
|
* to serialize, so the caller is expected to hold it. |
|
* |
|
* Return: 0 on success, -errno otherwise. |
|
*/ |
|
static int msc_buffer_win_alloc(struct msc *msc, unsigned int nr_blocks) |
|
{ |
|
struct msc_window *win; |
|
int ret = -ENOMEM; |
|
|
|
if (!nr_blocks) |
|
return 0; |
|
|
|
win = kzalloc(sizeof(*win), GFP_KERNEL); |
|
if (!win) |
|
return -ENOMEM; |
|
|
|
win->msc = msc; |
|
win->sgt = &win->_sgt; |
|
win->lockout = WIN_READY; |
|
spin_lock_init(&win->lo_lock); |
|
|
|
if (!list_empty(&msc->win_list)) { |
|
struct msc_window *prev = list_last_entry(&msc->win_list, |
|
struct msc_window, |
|
entry); |
|
|
|
win->pgoff = prev->pgoff + prev->nr_blocks; |
|
} |
|
|
|
if (msc->mbuf && msc->mbuf->alloc_window) |
|
ret = msc->mbuf->alloc_window(msc->mbuf_priv, &win->sgt, |
|
nr_blocks << PAGE_SHIFT); |
|
else |
|
ret = __msc_buffer_win_alloc(win, nr_blocks); |
|
|
|
if (ret <= 0) |
|
goto err_nomem; |
|
|
|
msc_buffer_set_uc(win, ret); |
|
|
|
win->nr_segs = ret; |
|
win->nr_blocks = nr_blocks; |
|
|
|
if (list_empty(&msc->win_list)) { |
|
msc->base = msc_win_base(win); |
|
msc->base_addr = msc_win_base_dma(win); |
|
msc->cur_win = win; |
|
} |
|
|
|
list_add_tail(&win->entry, &msc->win_list); |
|
msc->nr_pages += nr_blocks; |
|
|
|
return 0; |
|
|
|
err_nomem: |
|
kfree(win); |
|
|
|
return ret; |
|
} |
|
|
|
static void __msc_buffer_win_free(struct msc *msc, struct msc_window *win) |
|
{ |
|
struct scatterlist *sg; |
|
int i; |
|
|
|
for_each_sg(win->sgt->sgl, sg, win->nr_segs, i) { |
|
struct page *page = sg_page(sg); |
|
|
|
page->mapping = NULL; |
|
dma_free_coherent(msc_dev(win->msc)->parent->parent, PAGE_SIZE, |
|
sg_virt(sg), sg_dma_address(sg)); |
|
} |
|
sg_free_table(win->sgt); |
|
} |
|
|
|
/** |
|
* msc_buffer_win_free() - free a window from MSC's window list |
|
* @msc: MSC device |
|
* @win: window to free |
|
* |
|
* This modifies msc::win_list and msc::base, which requires msc::buf_mutex |
|
* to serialize, so the caller is expected to hold it. |
|
*/ |
|
static void msc_buffer_win_free(struct msc *msc, struct msc_window *win) |
|
{ |
|
msc->nr_pages -= win->nr_blocks; |
|
|
|
list_del(&win->entry); |
|
if (list_empty(&msc->win_list)) { |
|
msc->base = NULL; |
|
msc->base_addr = 0; |
|
} |
|
|
|
msc_buffer_set_wb(win); |
|
|
|
if (msc->mbuf && msc->mbuf->free_window) |
|
msc->mbuf->free_window(msc->mbuf_priv, win->sgt); |
|
else |
|
__msc_buffer_win_free(msc, win); |
|
|
|
kfree(win); |
|
} |
|
|
|
/** |
|
* msc_buffer_relink() - set up block descriptors for multiblock mode |
|
* @msc: MSC device |
|
* |
|
* This traverses msc::win_list, which requires msc::buf_mutex to serialize, |
|
* so the caller is expected to hold it. |
|
*/ |
|
static void msc_buffer_relink(struct msc *msc) |
|
{ |
|
struct msc_window *win, *next_win; |
|
|
|
/* call with msc::mutex locked */ |
|
list_for_each_entry(win, &msc->win_list, entry) { |
|
struct scatterlist *sg; |
|
unsigned int blk; |
|
u32 sw_tag = 0; |
|
|
|
/* |
|
* Last window's next_win should point to the first window |
|
* and MSC_SW_TAG_LASTWIN should be set. |
|
*/ |
|
if (msc_is_last_win(win)) { |
|
sw_tag |= MSC_SW_TAG_LASTWIN; |
|
next_win = list_first_entry(&msc->win_list, |
|
struct msc_window, entry); |
|
} else { |
|
next_win = list_next_entry(win, entry); |
|
} |
|
|
|
for_each_sg(win->sgt->sgl, sg, win->nr_segs, blk) { |
|
struct msc_block_desc *bdesc = sg_virt(sg); |
|
|
|
memset(bdesc, 0, sizeof(*bdesc)); |
|
|
|
bdesc->next_win = msc_win_base_pfn(next_win); |
|
|
|
/* |
|
* Similarly to last window, last block should point |
|
* to the first one. |
|
*/ |
|
if (blk == win->nr_segs - 1) { |
|
sw_tag |= MSC_SW_TAG_LASTBLK; |
|
bdesc->next_blk = msc_win_base_pfn(win); |
|
} else { |
|
dma_addr_t addr = sg_dma_address(sg_next(sg)); |
|
|
|
bdesc->next_blk = PFN_DOWN(addr); |
|
} |
|
|
|
bdesc->sw_tag = sw_tag; |
|
bdesc->block_sz = sg->length / 64; |
|
} |
|
} |
|
|
|
/* |
|
* Make the above writes globally visible before tracing is |
|
* enabled to make sure hardware sees them coherently. |
|
*/ |
|
wmb(); |
|
} |
|
|
|
static void msc_buffer_multi_free(struct msc *msc) |
|
{ |
|
struct msc_window *win, *iter; |
|
|
|
list_for_each_entry_safe(win, iter, &msc->win_list, entry) |
|
msc_buffer_win_free(msc, win); |
|
} |
|
|
|
static int msc_buffer_multi_alloc(struct msc *msc, unsigned long *nr_pages, |
|
unsigned int nr_wins) |
|
{ |
|
int ret, i; |
|
|
|
for (i = 0; i < nr_wins; i++) { |
|
ret = msc_buffer_win_alloc(msc, nr_pages[i]); |
|
if (ret) { |
|
msc_buffer_multi_free(msc); |
|
return ret; |
|
} |
|
} |
|
|
|
msc_buffer_relink(msc); |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* msc_buffer_free() - free buffers for MSC |
|
* @msc: MSC device |
|
* |
|
* Free MSC's storage buffers. |
|
* |
|
* This modifies msc::win_list and msc::base, which requires msc::buf_mutex to |
|
* serialize, so the caller is expected to hold it. |
|
*/ |
|
static void msc_buffer_free(struct msc *msc) |
|
{ |
|
if (msc->mode == MSC_MODE_SINGLE) |
|
msc_buffer_contig_free(msc); |
|
else if (msc->mode == MSC_MODE_MULTI) |
|
msc_buffer_multi_free(msc); |
|
} |
|
|
|
/** |
|
* msc_buffer_alloc() - allocate a buffer for MSC |
|
* @msc: MSC device |
|
* @size: allocation size in bytes |
|
* |
|
* Allocate a storage buffer for MSC, depending on the msc::mode, it will be |
|
* either done via msc_buffer_contig_alloc() for SINGLE operation mode or |
|
* msc_buffer_win_alloc() for multiblock operation. The latter allocates one |
|
* window per invocation, so in multiblock mode this can be called multiple |
|
* times for the same MSC to allocate multiple windows. |
|
* |
|
* This modifies msc::win_list and msc::base, which requires msc::buf_mutex |
|
* to serialize, so the caller is expected to hold it. |
|
* |
|
* Return: 0 on success, -errno otherwise. |
|
*/ |
|
static int msc_buffer_alloc(struct msc *msc, unsigned long *nr_pages, |
|
unsigned int nr_wins) |
|
{ |
|
int ret; |
|
|
|
/* -1: buffer not allocated */ |
|
if (atomic_read(&msc->user_count) != -1) |
|
return -EBUSY; |
|
|
|
if (msc->mode == MSC_MODE_SINGLE) { |
|
if (nr_wins != 1) |
|
return -EINVAL; |
|
|
|
ret = msc_buffer_contig_alloc(msc, nr_pages[0] << PAGE_SHIFT); |
|
} else if (msc->mode == MSC_MODE_MULTI) { |
|
ret = msc_buffer_multi_alloc(msc, nr_pages, nr_wins); |
|
} else { |
|
ret = -EINVAL; |
|
} |
|
|
|
if (!ret) { |
|
/* allocation should be visible before the counter goes to 0 */ |
|
smp_mb__before_atomic(); |
|
|
|
if (WARN_ON_ONCE(atomic_cmpxchg(&msc->user_count, -1, 0) != -1)) |
|
return -EINVAL; |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
/** |
|
* msc_buffer_unlocked_free_unless_used() - free a buffer unless it's in use |
|
* @msc: MSC device |
|
* |
|
* This will free MSC buffer unless it is in use or there is no allocated |
|
* buffer. |
|
* Caller needs to hold msc::buf_mutex. |
|
* |
|
* Return: 0 on successful deallocation or if there was no buffer to |
|
* deallocate, -EBUSY if there are active users. |
|
*/ |
|
static int msc_buffer_unlocked_free_unless_used(struct msc *msc) |
|
{ |
|
int count, ret = 0; |
|
|
|
count = atomic_cmpxchg(&msc->user_count, 0, -1); |
|
|
|
/* > 0: buffer is allocated and has users */ |
|
if (count > 0) |
|
ret = -EBUSY; |
|
/* 0: buffer is allocated, no users */ |
|
else if (!count) |
|
msc_buffer_free(msc); |
|
/* < 0: no buffer, nothing to do */ |
|
|
|
return ret; |
|
} |
|
|
|
/** |
|
* msc_buffer_free_unless_used() - free a buffer unless it's in use |
|
* @msc: MSC device |
|
* |
|
* This is a locked version of msc_buffer_unlocked_free_unless_used(). |
|
*/ |
|
static int msc_buffer_free_unless_used(struct msc *msc) |
|
{ |
|
int ret; |
|
|
|
mutex_lock(&msc->buf_mutex); |
|
ret = msc_buffer_unlocked_free_unless_used(msc); |
|
mutex_unlock(&msc->buf_mutex); |
|
|
|
return ret; |
|
} |
|
|
|
/** |
|
* msc_buffer_get_page() - get MSC buffer page at a given offset |
|
* @msc: MSC device |
|
* @pgoff: page offset into the storage buffer |
|
* |
|
* This traverses msc::win_list, so holding msc::buf_mutex is expected from |
|
* the caller. |
|
* |
|
* Return: page if @pgoff corresponds to a valid buffer page or NULL. |
|
*/ |
|
static struct page *msc_buffer_get_page(struct msc *msc, unsigned long pgoff) |
|
{ |
|
struct msc_window *win; |
|
struct scatterlist *sg; |
|
unsigned int blk; |
|
|
|
if (msc->mode == MSC_MODE_SINGLE) |
|
return msc_buffer_contig_get_page(msc, pgoff); |
|
|
|
list_for_each_entry(win, &msc->win_list, entry) |
|
if (pgoff >= win->pgoff && pgoff < win->pgoff + win->nr_blocks) |
|
goto found; |
|
|
|
return NULL; |
|
|
|
found: |
|
pgoff -= win->pgoff; |
|
|
|
for_each_sg(win->sgt->sgl, sg, win->nr_segs, blk) { |
|
struct page *page = sg_page(sg); |
|
size_t pgsz = PFN_DOWN(sg->length); |
|
|
|
if (pgoff < pgsz) |
|
return page + pgoff; |
|
|
|
pgoff -= pgsz; |
|
} |
|
|
|
return NULL; |
|
} |
|
|
|
/** |
|
* struct msc_win_to_user_struct - data for copy_to_user() callback |
|
* @buf: userspace buffer to copy data to |
|
* @offset: running offset |
|
*/ |
|
struct msc_win_to_user_struct { |
|
char __user *buf; |
|
unsigned long offset; |
|
}; |
|
|
|
/** |
|
* msc_win_to_user() - iterator for msc_buffer_iterate() to copy data to user |
|
* @data: callback's private data |
|
* @src: source buffer |
|
* @len: amount of data to copy from the source buffer |
|
*/ |
|
static unsigned long msc_win_to_user(void *data, void *src, size_t len) |
|
{ |
|
struct msc_win_to_user_struct *u = data; |
|
unsigned long ret; |
|
|
|
ret = copy_to_user(u->buf + u->offset, src, len); |
|
u->offset += len - ret; |
|
|
|
return ret; |
|
} |
|
|
|
|
|
/* |
|
* file operations' callbacks |
|
*/ |
|
|
|
static int intel_th_msc_open(struct inode *inode, struct file *file) |
|
{ |
|
struct intel_th_device *thdev = file->private_data; |
|
struct msc *msc = dev_get_drvdata(&thdev->dev); |
|
struct msc_iter *iter; |
|
|
|
if (!capable(CAP_SYS_RAWIO)) |
|
return -EPERM; |
|
|
|
iter = msc_iter_install(msc); |
|
if (IS_ERR(iter)) |
|
return PTR_ERR(iter); |
|
|
|
file->private_data = iter; |
|
|
|
return nonseekable_open(inode, file); |
|
} |
|
|
|
static int intel_th_msc_release(struct inode *inode, struct file *file) |
|
{ |
|
struct msc_iter *iter = file->private_data; |
|
struct msc *msc = iter->msc; |
|
|
|
msc_iter_remove(iter, msc); |
|
|
|
return 0; |
|
} |
|
|
|
static ssize_t |
|
msc_single_to_user(struct msc *msc, char __user *buf, loff_t off, size_t len) |
|
{ |
|
unsigned long size = msc->nr_pages << PAGE_SHIFT, rem = len; |
|
unsigned long start = off, tocopy = 0; |
|
|
|
if (msc->single_wrap) { |
|
start += msc->single_sz; |
|
if (start < size) { |
|
tocopy = min(rem, size - start); |
|
if (copy_to_user(buf, msc->base + start, tocopy)) |
|
return -EFAULT; |
|
|
|
buf += tocopy; |
|
rem -= tocopy; |
|
start += tocopy; |
|
} |
|
|
|
start &= size - 1; |
|
if (rem) { |
|
tocopy = min(rem, msc->single_sz - start); |
|
if (copy_to_user(buf, msc->base + start, tocopy)) |
|
return -EFAULT; |
|
|
|
rem -= tocopy; |
|
} |
|
|
|
return len - rem; |
|
} |
|
|
|
if (copy_to_user(buf, msc->base + start, rem)) |
|
return -EFAULT; |
|
|
|
return len; |
|
} |
|
|
|
static ssize_t intel_th_msc_read(struct file *file, char __user *buf, |
|
size_t len, loff_t *ppos) |
|
{ |
|
struct msc_iter *iter = file->private_data; |
|
struct msc *msc = iter->msc; |
|
size_t size; |
|
loff_t off = *ppos; |
|
ssize_t ret = 0; |
|
|
|
if (!atomic_inc_unless_negative(&msc->user_count)) |
|
return 0; |
|
|
|
if (msc->mode == MSC_MODE_SINGLE && !msc->single_wrap) |
|
size = msc->single_sz; |
|
else |
|
size = msc->nr_pages << PAGE_SHIFT; |
|
|
|
if (!size) |
|
goto put_count; |
|
|
|
if (off >= size) |
|
goto put_count; |
|
|
|
if (off + len >= size) |
|
len = size - off; |
|
|
|
if (msc->mode == MSC_MODE_SINGLE) { |
|
ret = msc_single_to_user(msc, buf, off, len); |
|
if (ret >= 0) |
|
*ppos += ret; |
|
} else if (msc->mode == MSC_MODE_MULTI) { |
|
struct msc_win_to_user_struct u = { |
|
.buf = buf, |
|
.offset = 0, |
|
}; |
|
|
|
ret = msc_buffer_iterate(iter, len, &u, msc_win_to_user); |
|
if (ret >= 0) |
|
*ppos = iter->offset; |
|
} else { |
|
ret = -EINVAL; |
|
} |
|
|
|
put_count: |
|
atomic_dec(&msc->user_count); |
|
|
|
return ret; |
|
} |
|
|
|
/* |
|
* vm operations callbacks (vm_ops) |
|
*/ |
|
|
|
static void msc_mmap_open(struct vm_area_struct *vma) |
|
{ |
|
struct msc_iter *iter = vma->vm_file->private_data; |
|
struct msc *msc = iter->msc; |
|
|
|
atomic_inc(&msc->mmap_count); |
|
} |
|
|
|
static void msc_mmap_close(struct vm_area_struct *vma) |
|
{ |
|
struct msc_iter *iter = vma->vm_file->private_data; |
|
struct msc *msc = iter->msc; |
|
unsigned long pg; |
|
|
|
if (!atomic_dec_and_mutex_lock(&msc->mmap_count, &msc->buf_mutex)) |
|
return; |
|
|
|
/* drop page _refcounts */ |
|
for (pg = 0; pg < msc->nr_pages; pg++) { |
|
struct page *page = msc_buffer_get_page(msc, pg); |
|
|
|
if (WARN_ON_ONCE(!page)) |
|
continue; |
|
|
|
if (page->mapping) |
|
page->mapping = NULL; |
|
} |
|
|
|
/* last mapping -- drop user_count */ |
|
atomic_dec(&msc->user_count); |
|
mutex_unlock(&msc->buf_mutex); |
|
} |
|
|
|
static vm_fault_t msc_mmap_fault(struct vm_fault *vmf) |
|
{ |
|
struct msc_iter *iter = vmf->vma->vm_file->private_data; |
|
struct msc *msc = iter->msc; |
|
|
|
vmf->page = msc_buffer_get_page(msc, vmf->pgoff); |
|
if (!vmf->page) |
|
return VM_FAULT_SIGBUS; |
|
|
|
get_page(vmf->page); |
|
vmf->page->mapping = vmf->vma->vm_file->f_mapping; |
|
vmf->page->index = vmf->pgoff; |
|
|
|
return 0; |
|
} |
|
|
|
static const struct vm_operations_struct msc_mmap_ops = { |
|
.open = msc_mmap_open, |
|
.close = msc_mmap_close, |
|
.fault = msc_mmap_fault, |
|
}; |
|
|
|
static int intel_th_msc_mmap(struct file *file, struct vm_area_struct *vma) |
|
{ |
|
unsigned long size = vma->vm_end - vma->vm_start; |
|
struct msc_iter *iter = vma->vm_file->private_data; |
|
struct msc *msc = iter->msc; |
|
int ret = -EINVAL; |
|
|
|
if (!size || offset_in_page(size)) |
|
return -EINVAL; |
|
|
|
if (vma->vm_pgoff) |
|
return -EINVAL; |
|
|
|
/* grab user_count once per mmap; drop in msc_mmap_close() */ |
|
if (!atomic_inc_unless_negative(&msc->user_count)) |
|
return -EINVAL; |
|
|
|
if (msc->mode != MSC_MODE_SINGLE && |
|
msc->mode != MSC_MODE_MULTI) |
|
goto out; |
|
|
|
if (size >> PAGE_SHIFT != msc->nr_pages) |
|
goto out; |
|
|
|
atomic_set(&msc->mmap_count, 1); |
|
ret = 0; |
|
|
|
out: |
|
if (ret) |
|
atomic_dec(&msc->user_count); |
|
|
|
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); |
|
vma->vm_flags |= VM_DONTEXPAND | VM_DONTCOPY; |
|
vma->vm_ops = &msc_mmap_ops; |
|
return ret; |
|
} |
|
|
|
static const struct file_operations intel_th_msc_fops = { |
|
.open = intel_th_msc_open, |
|
.release = intel_th_msc_release, |
|
.read = intel_th_msc_read, |
|
.mmap = intel_th_msc_mmap, |
|
.llseek = no_llseek, |
|
.owner = THIS_MODULE, |
|
}; |
|
|
|
static void intel_th_msc_wait_empty(struct intel_th_device *thdev) |
|
{ |
|
struct msc *msc = dev_get_drvdata(&thdev->dev); |
|
unsigned long count; |
|
u32 reg; |
|
|
|
for (reg = 0, count = MSC_PLE_WAITLOOP_DEPTH; |
|
count && !(reg & MSCSTS_PLE); count--) { |
|
reg = __raw_readl(msc->reg_base + REG_MSU_MSC0STS); |
|
cpu_relax(); |
|
} |
|
|
|
if (!count) |
|
dev_dbg(msc_dev(msc), "timeout waiting for MSC0 PLE\n"); |
|
} |
|
|
|
static int intel_th_msc_init(struct msc *msc) |
|
{ |
|
atomic_set(&msc->user_count, -1); |
|
|
|
msc->mode = msc->multi_is_broken ? MSC_MODE_SINGLE : MSC_MODE_MULTI; |
|
mutex_init(&msc->buf_mutex); |
|
INIT_LIST_HEAD(&msc->win_list); |
|
INIT_LIST_HEAD(&msc->iter_list); |
|
|
|
msc->burst_len = |
|
(ioread32(msc->reg_base + REG_MSU_MSC0CTL) & MSC_LEN) >> |
|
__ffs(MSC_LEN); |
|
|
|
return 0; |
|
} |
|
|
|
static int msc_win_switch(struct msc *msc) |
|
{ |
|
struct msc_window *first; |
|
|
|
if (list_empty(&msc->win_list)) |
|
return -EINVAL; |
|
|
|
first = list_first_entry(&msc->win_list, struct msc_window, entry); |
|
|
|
if (msc_is_last_win(msc->cur_win)) |
|
msc->cur_win = first; |
|
else |
|
msc->cur_win = list_next_entry(msc->cur_win, entry); |
|
|
|
msc->base = msc_win_base(msc->cur_win); |
|
msc->base_addr = msc_win_base_dma(msc->cur_win); |
|
|
|
intel_th_trace_switch(msc->thdev); |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* intel_th_msc_window_unlock - put the window back in rotation |
|
* @dev: MSC device to which this relates |
|
* @sgt: buffer's sg_table for the window, does nothing if NULL |
|
*/ |
|
void intel_th_msc_window_unlock(struct device *dev, struct sg_table *sgt) |
|
{ |
|
struct msc *msc = dev_get_drvdata(dev); |
|
struct msc_window *win; |
|
|
|
if (!sgt) |
|
return; |
|
|
|
win = msc_find_window(msc, sgt, false); |
|
if (!win) |
|
return; |
|
|
|
msc_win_set_lockout(win, WIN_LOCKED, WIN_READY); |
|
if (msc->switch_on_unlock == win) { |
|
msc->switch_on_unlock = NULL; |
|
msc_win_switch(msc); |
|
} |
|
} |
|
EXPORT_SYMBOL_GPL(intel_th_msc_window_unlock); |
|
|
|
static void msc_work(struct work_struct *work) |
|
{ |
|
struct msc *msc = container_of(work, struct msc, work); |
|
|
|
intel_th_msc_deactivate(msc->thdev); |
|
} |
|
|
|
static irqreturn_t intel_th_msc_interrupt(struct intel_th_device *thdev) |
|
{ |
|
struct msc *msc = dev_get_drvdata(&thdev->dev); |
|
u32 msusts = ioread32(msc->msu_base + REG_MSU_MSUSTS); |
|
u32 mask = msc->index ? MSUSTS_MSC1BLAST : MSUSTS_MSC0BLAST; |
|
struct msc_window *win, *next_win; |
|
|
|
if (!msc->do_irq || !msc->mbuf) |
|
return IRQ_NONE; |
|
|
|
msusts &= mask; |
|
|
|
if (!msusts) |
|
return msc->enabled ? IRQ_HANDLED : IRQ_NONE; |
|
|
|
iowrite32(msusts, msc->msu_base + REG_MSU_MSUSTS); |
|
|
|
if (!msc->enabled) |
|
return IRQ_NONE; |
|
|
|
/* grab the window before we do the switch */ |
|
win = msc->cur_win; |
|
if (!win) |
|
return IRQ_HANDLED; |
|
next_win = msc_next_window(win); |
|
if (!next_win) |
|
return IRQ_HANDLED; |
|
|
|
/* next window: if READY, proceed, if LOCKED, stop the trace */ |
|
if (msc_win_set_lockout(next_win, WIN_READY, WIN_INUSE)) { |
|
if (msc->stop_on_full) |
|
schedule_work(&msc->work); |
|
else |
|
msc->switch_on_unlock = next_win; |
|
|
|
return IRQ_HANDLED; |
|
} |
|
|
|
/* current window: INUSE -> LOCKED */ |
|
msc_win_set_lockout(win, WIN_INUSE, WIN_LOCKED); |
|
|
|
msc_win_switch(msc); |
|
|
|
if (msc->mbuf && msc->mbuf->ready) |
|
msc->mbuf->ready(msc->mbuf_priv, win->sgt, |
|
msc_win_total_sz(win)); |
|
|
|
return IRQ_HANDLED; |
|
} |
|
|
|
static const char * const msc_mode[] = { |
|
[MSC_MODE_SINGLE] = "single", |
|
[MSC_MODE_MULTI] = "multi", |
|
[MSC_MODE_EXI] = "ExI", |
|
[MSC_MODE_DEBUG] = "debug", |
|
}; |
|
|
|
static ssize_t |
|
wrap_show(struct device *dev, struct device_attribute *attr, char *buf) |
|
{ |
|
struct msc *msc = dev_get_drvdata(dev); |
|
|
|
return scnprintf(buf, PAGE_SIZE, "%d\n", msc->wrap); |
|
} |
|
|
|
static ssize_t |
|
wrap_store(struct device *dev, struct device_attribute *attr, const char *buf, |
|
size_t size) |
|
{ |
|
struct msc *msc = dev_get_drvdata(dev); |
|
unsigned long val; |
|
int ret; |
|
|
|
ret = kstrtoul(buf, 10, &val); |
|
if (ret) |
|
return ret; |
|
|
|
msc->wrap = !!val; |
|
|
|
return size; |
|
} |
|
|
|
static DEVICE_ATTR_RW(wrap); |
|
|
|
static void msc_buffer_unassign(struct msc *msc) |
|
{ |
|
lockdep_assert_held(&msc->buf_mutex); |
|
|
|
if (!msc->mbuf) |
|
return; |
|
|
|
msc->mbuf->unassign(msc->mbuf_priv); |
|
msu_buffer_put(msc->mbuf); |
|
msc->mbuf_priv = NULL; |
|
msc->mbuf = NULL; |
|
} |
|
|
|
static ssize_t |
|
mode_show(struct device *dev, struct device_attribute *attr, char *buf) |
|
{ |
|
struct msc *msc = dev_get_drvdata(dev); |
|
const char *mode = msc_mode[msc->mode]; |
|
ssize_t ret; |
|
|
|
mutex_lock(&msc->buf_mutex); |
|
if (msc->mbuf) |
|
mode = msc->mbuf->name; |
|
ret = scnprintf(buf, PAGE_SIZE, "%s\n", mode); |
|
mutex_unlock(&msc->buf_mutex); |
|
|
|
return ret; |
|
} |
|
|
|
static ssize_t |
|
mode_store(struct device *dev, struct device_attribute *attr, const char *buf, |
|
size_t size) |
|
{ |
|
const struct msu_buffer *mbuf = NULL; |
|
struct msc *msc = dev_get_drvdata(dev); |
|
size_t len = size; |
|
char *cp, *mode; |
|
int i, ret; |
|
|
|
if (!capable(CAP_SYS_RAWIO)) |
|
return -EPERM; |
|
|
|
cp = memchr(buf, '\n', len); |
|
if (cp) |
|
len = cp - buf; |
|
|
|
mode = kstrndup(buf, len, GFP_KERNEL); |
|
if (!mode) |
|
return -ENOMEM; |
|
|
|
i = match_string(msc_mode, ARRAY_SIZE(msc_mode), mode); |
|
if (i >= 0) { |
|
kfree(mode); |
|
goto found; |
|
} |
|
|
|
/* Buffer sinks only work with a usable IRQ */ |
|
if (!msc->do_irq) { |
|
kfree(mode); |
|
return -EINVAL; |
|
} |
|
|
|
mbuf = msu_buffer_get(mode); |
|
kfree(mode); |
|
if (mbuf) |
|
goto found; |
|
|
|
return -EINVAL; |
|
|
|
found: |
|
if (i == MSC_MODE_MULTI && msc->multi_is_broken) |
|
return -EOPNOTSUPP; |
|
|
|
mutex_lock(&msc->buf_mutex); |
|
ret = 0; |
|
|
|
/* Same buffer: do nothing */ |
|
if (mbuf && mbuf == msc->mbuf) { |
|
/* put the extra reference we just got */ |
|
msu_buffer_put(mbuf); |
|
goto unlock; |
|
} |
|
|
|
ret = msc_buffer_unlocked_free_unless_used(msc); |
|
if (ret) |
|
goto unlock; |
|
|
|
if (mbuf) { |
|
void *mbuf_priv = mbuf->assign(dev, &i); |
|
|
|
if (!mbuf_priv) { |
|
ret = -ENOMEM; |
|
goto unlock; |
|
} |
|
|
|
msc_buffer_unassign(msc); |
|
msc->mbuf_priv = mbuf_priv; |
|
msc->mbuf = mbuf; |
|
} else { |
|
msc_buffer_unassign(msc); |
|
} |
|
|
|
msc->mode = i; |
|
|
|
unlock: |
|
if (ret && mbuf) |
|
msu_buffer_put(mbuf); |
|
mutex_unlock(&msc->buf_mutex); |
|
|
|
return ret ? ret : size; |
|
} |
|
|
|
static DEVICE_ATTR_RW(mode); |
|
|
|
static ssize_t |
|
nr_pages_show(struct device *dev, struct device_attribute *attr, char *buf) |
|
{ |
|
struct msc *msc = dev_get_drvdata(dev); |
|
struct msc_window *win; |
|
size_t count = 0; |
|
|
|
mutex_lock(&msc->buf_mutex); |
|
|
|
if (msc->mode == MSC_MODE_SINGLE) |
|
count = scnprintf(buf, PAGE_SIZE, "%ld\n", msc->nr_pages); |
|
else if (msc->mode == MSC_MODE_MULTI) { |
|
list_for_each_entry(win, &msc->win_list, entry) { |
|
count += scnprintf(buf + count, PAGE_SIZE - count, |
|
"%d%c", win->nr_blocks, |
|
msc_is_last_win(win) ? '\n' : ','); |
|
} |
|
} else { |
|
count = scnprintf(buf, PAGE_SIZE, "unsupported\n"); |
|
} |
|
|
|
mutex_unlock(&msc->buf_mutex); |
|
|
|
return count; |
|
} |
|
|
|
static ssize_t |
|
nr_pages_store(struct device *dev, struct device_attribute *attr, |
|
const char *buf, size_t size) |
|
{ |
|
struct msc *msc = dev_get_drvdata(dev); |
|
unsigned long val, *win = NULL, *rewin; |
|
size_t len = size; |
|
const char *p = buf; |
|
char *end, *s; |
|
int ret, nr_wins = 0; |
|
|
|
if (!capable(CAP_SYS_RAWIO)) |
|
return -EPERM; |
|
|
|
ret = msc_buffer_free_unless_used(msc); |
|
if (ret) |
|
return ret; |
|
|
|
/* scan the comma-separated list of allocation sizes */ |
|
end = memchr(buf, '\n', len); |
|
if (end) |
|
len = end - buf; |
|
|
|
do { |
|
end = memchr(p, ',', len); |
|
s = kstrndup(p, end ? end - p : len, GFP_KERNEL); |
|
if (!s) { |
|
ret = -ENOMEM; |
|
goto free_win; |
|
} |
|
|
|
ret = kstrtoul(s, 10, &val); |
|
kfree(s); |
|
|
|
if (ret || !val) |
|
goto free_win; |
|
|
|
if (nr_wins && msc->mode == MSC_MODE_SINGLE) { |
|
ret = -EINVAL; |
|
goto free_win; |
|
} |
|
|
|
nr_wins++; |
|
rewin = krealloc_array(win, nr_wins, sizeof(*win), GFP_KERNEL); |
|
if (!rewin) { |
|
kfree(win); |
|
return -ENOMEM; |
|
} |
|
|
|
win = rewin; |
|
win[nr_wins - 1] = val; |
|
|
|
if (!end) |
|
break; |
|
|
|
/* consume the number and the following comma, hence +1 */ |
|
len -= end - p + 1; |
|
p = end + 1; |
|
} while (len); |
|
|
|
mutex_lock(&msc->buf_mutex); |
|
ret = msc_buffer_alloc(msc, win, nr_wins); |
|
mutex_unlock(&msc->buf_mutex); |
|
|
|
free_win: |
|
kfree(win); |
|
|
|
return ret ? ret : size; |
|
} |
|
|
|
static DEVICE_ATTR_RW(nr_pages); |
|
|
|
static ssize_t |
|
win_switch_store(struct device *dev, struct device_attribute *attr, |
|
const char *buf, size_t size) |
|
{ |
|
struct msc *msc = dev_get_drvdata(dev); |
|
unsigned long val; |
|
int ret; |
|
|
|
ret = kstrtoul(buf, 10, &val); |
|
if (ret) |
|
return ret; |
|
|
|
if (val != 1) |
|
return -EINVAL; |
|
|
|
ret = -EINVAL; |
|
mutex_lock(&msc->buf_mutex); |
|
/* |
|
* Window switch can only happen in the "multi" mode. |
|
* If a external buffer is engaged, they have the full |
|
* control over window switching. |
|
*/ |
|
if (msc->mode == MSC_MODE_MULTI && !msc->mbuf) |
|
ret = msc_win_switch(msc); |
|
mutex_unlock(&msc->buf_mutex); |
|
|
|
return ret ? ret : size; |
|
} |
|
|
|
static DEVICE_ATTR_WO(win_switch); |
|
|
|
static ssize_t stop_on_full_show(struct device *dev, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
struct msc *msc = dev_get_drvdata(dev); |
|
|
|
return sprintf(buf, "%d\n", msc->stop_on_full); |
|
} |
|
|
|
static ssize_t stop_on_full_store(struct device *dev, |
|
struct device_attribute *attr, |
|
const char *buf, size_t size) |
|
{ |
|
struct msc *msc = dev_get_drvdata(dev); |
|
int ret; |
|
|
|
ret = kstrtobool(buf, &msc->stop_on_full); |
|
if (ret) |
|
return ret; |
|
|
|
return size; |
|
} |
|
|
|
static DEVICE_ATTR_RW(stop_on_full); |
|
|
|
static struct attribute *msc_output_attrs[] = { |
|
&dev_attr_wrap.attr, |
|
&dev_attr_mode.attr, |
|
&dev_attr_nr_pages.attr, |
|
&dev_attr_win_switch.attr, |
|
&dev_attr_stop_on_full.attr, |
|
NULL, |
|
}; |
|
|
|
static struct attribute_group msc_output_group = { |
|
.attrs = msc_output_attrs, |
|
}; |
|
|
|
static int intel_th_msc_probe(struct intel_th_device *thdev) |
|
{ |
|
struct device *dev = &thdev->dev; |
|
struct resource *res; |
|
struct msc *msc; |
|
void __iomem *base; |
|
int err; |
|
|
|
res = intel_th_device_get_resource(thdev, IORESOURCE_MEM, 0); |
|
if (!res) |
|
return -ENODEV; |
|
|
|
base = devm_ioremap(dev, res->start, resource_size(res)); |
|
if (!base) |
|
return -ENOMEM; |
|
|
|
msc = devm_kzalloc(dev, sizeof(*msc), GFP_KERNEL); |
|
if (!msc) |
|
return -ENOMEM; |
|
|
|
res = intel_th_device_get_resource(thdev, IORESOURCE_IRQ, 1); |
|
if (!res) |
|
msc->do_irq = 1; |
|
|
|
if (INTEL_TH_CAP(to_intel_th(thdev), multi_is_broken)) |
|
msc->multi_is_broken = 1; |
|
|
|
msc->index = thdev->id; |
|
|
|
msc->thdev = thdev; |
|
msc->reg_base = base + msc->index * 0x100; |
|
msc->msu_base = base; |
|
|
|
INIT_WORK(&msc->work, msc_work); |
|
err = intel_th_msc_init(msc); |
|
if (err) |
|
return err; |
|
|
|
dev_set_drvdata(dev, msc); |
|
|
|
return 0; |
|
} |
|
|
|
static void intel_th_msc_remove(struct intel_th_device *thdev) |
|
{ |
|
struct msc *msc = dev_get_drvdata(&thdev->dev); |
|
int ret; |
|
|
|
intel_th_msc_deactivate(thdev); |
|
|
|
/* |
|
* Buffers should not be used at this point except if the |
|
* output character device is still open and the parent |
|
* device gets detached from its bus, which is a FIXME. |
|
*/ |
|
ret = msc_buffer_free_unless_used(msc); |
|
WARN_ON_ONCE(ret); |
|
} |
|
|
|
static struct intel_th_driver intel_th_msc_driver = { |
|
.probe = intel_th_msc_probe, |
|
.remove = intel_th_msc_remove, |
|
.irq = intel_th_msc_interrupt, |
|
.wait_empty = intel_th_msc_wait_empty, |
|
.activate = intel_th_msc_activate, |
|
.deactivate = intel_th_msc_deactivate, |
|
.fops = &intel_th_msc_fops, |
|
.attr_group = &msc_output_group, |
|
.driver = { |
|
.name = "msc", |
|
.owner = THIS_MODULE, |
|
}, |
|
}; |
|
|
|
module_driver(intel_th_msc_driver, |
|
intel_th_driver_register, |
|
intel_th_driver_unregister); |
|
|
|
MODULE_LICENSE("GPL v2"); |
|
MODULE_DESCRIPTION("Intel(R) Trace Hub Memory Storage Unit driver"); |
|
MODULE_AUTHOR("Alexander Shishkin <[email protected]>");
|
|
|