1248 строки
34 KiB
C
1248 строки
34 KiB
C
/*
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* arch/m68k/atari/stram.c: Functions for ST-RAM allocations
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*
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* Copyright 1994-97 Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de>
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive
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* for more details.
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*/
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#include <linux/config.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/kdev_t.h>
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#include <linux/major.h>
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#include <linux/init.h>
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#include <linux/swap.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/pagemap.h>
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#include <linux/shm.h>
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#include <linux/bootmem.h>
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#include <linux/mount.h>
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#include <linux/blkdev.h>
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#include <asm/setup.h>
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#include <asm/machdep.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/atarihw.h>
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#include <asm/atari_stram.h>
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#include <asm/io.h>
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#include <asm/semaphore.h>
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#include <linux/swapops.h>
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#undef DEBUG
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#ifdef DEBUG
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#define DPRINTK(fmt,args...) printk( fmt, ##args )
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#else
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#define DPRINTK(fmt,args...)
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#endif
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#if defined(CONFIG_PROC_FS) && defined(CONFIG_STRAM_PROC)
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/* abbrev for the && above... */
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#define DO_PROC
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#include <linux/proc_fs.h>
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#endif
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/* Pre-swapping comments:
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*
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* ++roman:
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*
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* New version of ST-Ram buffer allocation. Instead of using the
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* 1 MB - 4 KB that remain when the ST-Ram chunk starts at $1000
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* (1 MB granularity!), such buffers are reserved like this:
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*
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* - If the kernel resides in ST-Ram anyway, we can take the buffer
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* from behind the current kernel data space the normal way
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* (incrementing start_mem).
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*
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* - If the kernel is in TT-Ram, stram_init() initializes start and
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* end of the available region. Buffers are allocated from there
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* and mem_init() later marks the such used pages as reserved.
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* Since each TT-Ram chunk is at least 4 MB in size, I hope there
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* won't be an overrun of the ST-Ram region by normal kernel data
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* space.
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*
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* For that, ST-Ram may only be allocated while kernel initialization
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* is going on, or exactly: before mem_init() is called. There is also
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* no provision now for freeing ST-Ram buffers. It seems that isn't
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* really needed.
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*
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*/
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/*
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* New Nov 1997: Use ST-RAM as swap space!
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*
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* In the past, there were often problems with modules that require ST-RAM
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* buffers. Such drivers have to use __get_dma_pages(), which unfortunately
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* often isn't very successful in allocating more than 1 page :-( [1] The net
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* result was that most of the time you couldn't insmod such modules (ataflop,
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* ACSI, SCSI on Falcon, Atari internal framebuffer, not to speak of acsi_slm,
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* which needs a 1 MB buffer... :-).
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*
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* To overcome this limitation, ST-RAM can now be turned into a very
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* high-speed swap space. If a request for an ST-RAM buffer comes, the kernel
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* now tries to unswap some pages on that swap device to make some free (and
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* contiguous) space. This works much better in comparison to
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* __get_dma_pages(), since used swap pages can be selectively freed by either
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* moving them to somewhere else in swap space, or by reading them back into
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* system memory. Ok, there operation of unswapping isn't really cheap (for
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* each page, one has to go through the page tables of all processes), but it
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* doesn't happen that often (only when allocation ST-RAM, i.e. when loading a
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* module that needs ST-RAM). But it at least makes it possible to load such
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* modules!
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*
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* It could also be that overall system performance increases a bit due to
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* ST-RAM swapping, since slow ST-RAM isn't used anymore for holding data or
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* executing code in. It's then just a (very fast, compared to disk) back
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* storage for not-so-often needed data. (But this effect must be compared
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* with the loss of total memory...) Don't know if the effect is already
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* visible on a TT, where the speed difference between ST- and TT-RAM isn't
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* that dramatic, but it should on machines where TT-RAM is really much faster
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* (e.g. Afterburner).
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*
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* [1]: __get_free_pages() does a fine job if you only want one page, but if
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* you want more (contiguous) pages, it can give you such a block only if
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* there's already a free one. The algorithm can't try to free buffers or swap
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* out something in order to make more free space, since all that page-freeing
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* mechanisms work "target-less", i.e. they just free something, but not in a
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* specific place. I.e., __get_free_pages() can't do anything to free
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* *adjacent* pages :-( This situation becomes even worse for DMA memory,
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* since the freeing algorithms are also blind to DMA capability of pages.
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*/
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/* 1998-10-20: ++andreas
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unswap_by_move disabled because it does not handle swapped shm pages.
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*/
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/* 2000-05-01: ++andreas
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Integrated with bootmem. Remove all traces of unswap_by_move.
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*/
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#ifdef CONFIG_STRAM_SWAP
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#define ALIGN_IF_SWAP(x) PAGE_ALIGN(x)
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#else
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#define ALIGN_IF_SWAP(x) (x)
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#endif
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/* get index of swap page at address 'addr' */
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#define SWAP_NR(addr) (((addr) - swap_start) >> PAGE_SHIFT)
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/* get address of swap page #'nr' */
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#define SWAP_ADDR(nr) (swap_start + ((nr) << PAGE_SHIFT))
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/* get number of pages for 'n' bytes (already page-aligned) */
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#define N_PAGES(n) ((n) >> PAGE_SHIFT)
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/* The following two numbers define the maximum fraction of ST-RAM in total
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* memory, below that the kernel would automatically use ST-RAM as swap
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* space. This decision can be overridden with stram_swap= */
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#define MAX_STRAM_FRACTION_NOM 1
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#define MAX_STRAM_FRACTION_DENOM 3
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/* Start and end (virtual) of ST-RAM */
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static void *stram_start, *stram_end;
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/* set after memory_init() executed and allocations via start_mem aren't
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* possible anymore */
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static int mem_init_done;
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/* set if kernel is in ST-RAM */
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static int kernel_in_stram;
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typedef struct stram_block {
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struct stram_block *next;
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void *start;
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unsigned long size;
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unsigned flags;
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const char *owner;
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} BLOCK;
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/* values for flags field */
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#define BLOCK_FREE 0x01 /* free structure in the BLOCKs pool */
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#define BLOCK_KMALLOCED 0x02 /* structure allocated by kmalloc() */
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#define BLOCK_GFP 0x08 /* block allocated with __get_dma_pages() */
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#define BLOCK_INSWAP 0x10 /* block allocated in swap space */
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/* list of allocated blocks */
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static BLOCK *alloc_list;
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/* We can't always use kmalloc() to allocate BLOCK structures, since
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* stram_alloc() can be called rather early. So we need some pool of
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* statically allocated structures. 20 of them is more than enough, so in most
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* cases we never should need to call kmalloc(). */
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#define N_STATIC_BLOCKS 20
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static BLOCK static_blocks[N_STATIC_BLOCKS];
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#ifdef CONFIG_STRAM_SWAP
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/* max. number of bytes to use for swapping
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* 0 = no ST-RAM swapping
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* -1 = do swapping (to whole ST-RAM) if it's less than MAX_STRAM_FRACTION of
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* total memory
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*/
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static int max_swap_size = -1;
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/* start and end of swapping area */
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static void *swap_start, *swap_end;
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/* The ST-RAM's swap info structure */
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static struct swap_info_struct *stram_swap_info;
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/* The ST-RAM's swap type */
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static int stram_swap_type;
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/* Semaphore for get_stram_region. */
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static DECLARE_MUTEX(stram_swap_sem);
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/* major and minor device number of the ST-RAM device; for the major, we use
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* the same as Amiga z2ram, which is really similar and impossible on Atari,
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* and for the minor a relatively odd number to avoid the user creating and
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* using that device. */
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#define STRAM_MAJOR Z2RAM_MAJOR
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#define STRAM_MINOR 13
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/* Some impossible pointer value */
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#define MAGIC_FILE_P (struct file *)0xffffdead
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#ifdef DO_PROC
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static unsigned stat_swap_read;
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static unsigned stat_swap_write;
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static unsigned stat_swap_force;
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#endif /* DO_PROC */
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#endif /* CONFIG_STRAM_SWAP */
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/***************************** Prototypes *****************************/
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#ifdef CONFIG_STRAM_SWAP
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static int swap_init(void *start_mem, void *swap_data);
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static void *get_stram_region( unsigned long n_pages );
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static void free_stram_region( unsigned long offset, unsigned long n_pages
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);
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static int in_some_region(void *addr);
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static unsigned long find_free_region( unsigned long n_pages, unsigned long
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*total_free, unsigned long
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*region_free );
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static void do_stram_request(request_queue_t *);
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static int stram_open( struct inode *inode, struct file *filp );
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static int stram_release( struct inode *inode, struct file *filp );
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static void reserve_region(void *start, void *end);
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#endif
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static BLOCK *add_region( void *addr, unsigned long size );
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static BLOCK *find_region( void *addr );
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static int remove_region( BLOCK *block );
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/************************* End of Prototypes **************************/
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/* ------------------------------------------------------------------------ */
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/* Public Interface */
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/* ------------------------------------------------------------------------ */
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/*
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* This init function is called very early by atari/config.c
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* It initializes some internal variables needed for stram_alloc()
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*/
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void __init atari_stram_init(void)
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{
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int i;
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/* initialize static blocks */
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for( i = 0; i < N_STATIC_BLOCKS; ++i )
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static_blocks[i].flags = BLOCK_FREE;
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/* determine whether kernel code resides in ST-RAM (then ST-RAM is the
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* first memory block at virtual 0x0) */
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stram_start = phys_to_virt(0);
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kernel_in_stram = (stram_start == 0);
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for( i = 0; i < m68k_num_memory; ++i ) {
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if (m68k_memory[i].addr == 0) {
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/* skip first 2kB or page (supervisor-only!) */
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stram_end = stram_start + m68k_memory[i].size;
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return;
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}
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}
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/* Should never come here! (There is always ST-Ram!) */
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panic( "atari_stram_init: no ST-RAM found!" );
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}
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/*
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* This function is called from setup_arch() to reserve the pages needed for
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* ST-RAM management.
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*/
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void __init atari_stram_reserve_pages(void *start_mem)
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{
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#ifdef CONFIG_STRAM_SWAP
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/* if max_swap_size is negative (i.e. no stram_swap= option given),
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* determine at run time whether to use ST-RAM swapping */
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if (max_swap_size < 0)
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/* Use swapping if ST-RAM doesn't make up more than MAX_STRAM_FRACTION
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* of total memory. In that case, the max. size is set to 16 MB,
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* because ST-RAM can never be bigger than that.
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* Also, never use swapping on a Hades, there's no separate ST-RAM in
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* that machine. */
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max_swap_size =
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(!MACH_IS_HADES &&
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(N_PAGES(stram_end-stram_start)*MAX_STRAM_FRACTION_DENOM <=
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((unsigned long)high_memory>>PAGE_SHIFT)*MAX_STRAM_FRACTION_NOM)) ? 16*1024*1024 : 0;
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DPRINTK( "atari_stram_reserve_pages: max_swap_size = %d\n", max_swap_size );
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#endif
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/* always reserve first page of ST-RAM, the first 2 kB are
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* supervisor-only! */
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if (!kernel_in_stram)
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reserve_bootmem (0, PAGE_SIZE);
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#ifdef CONFIG_STRAM_SWAP
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{
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void *swap_data;
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start_mem = (void *) PAGE_ALIGN ((unsigned long) start_mem);
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/* determine first page to use as swap: if the kernel is
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in TT-RAM, this is the first page of (usable) ST-RAM;
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otherwise just use the end of kernel data (= start_mem) */
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swap_start = !kernel_in_stram ? stram_start + PAGE_SIZE : start_mem;
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/* decrement by one page, rest of kernel assumes that first swap page
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* is always reserved and maybe doesn't handle swp_entry == 0
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* correctly */
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swap_start -= PAGE_SIZE;
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swap_end = stram_end;
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if (swap_end-swap_start > max_swap_size)
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swap_end = swap_start + max_swap_size;
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DPRINTK( "atari_stram_reserve_pages: swapping enabled; "
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"swap=%p-%p\n", swap_start, swap_end);
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/* reserve some amount of memory for maintainance of
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* swapping itself: one page for each 2048 (PAGE_SIZE/2)
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* swap pages. (2 bytes for each page) */
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swap_data = start_mem;
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start_mem += ((SWAP_NR(swap_end) + PAGE_SIZE/2 - 1)
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>> (PAGE_SHIFT-1)) << PAGE_SHIFT;
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/* correct swap_start if necessary */
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if (swap_start + PAGE_SIZE == swap_data)
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swap_start = start_mem - PAGE_SIZE;
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if (!swap_init( start_mem, swap_data )) {
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printk( KERN_ERR "ST-RAM swap space initialization failed\n" );
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max_swap_size = 0;
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return;
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}
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/* reserve region for swapping meta-data */
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reserve_region(swap_data, start_mem);
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/* reserve swapping area itself */
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reserve_region(swap_start + PAGE_SIZE, swap_end);
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/*
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* If the whole ST-RAM is used for swapping, there are no allocatable
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* dma pages left. But unfortunately, some shared parts of the kernel
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* (particularly the SCSI mid-level) call __get_dma_pages()
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* unconditionally :-( These calls then fail, and scsi.c even doesn't
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* check for NULL return values and just crashes. The quick fix for
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* this (instead of doing much clean up work in the SCSI code) is to
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* pretend all pages are DMA-able by setting mach_max_dma_address to
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* ULONG_MAX. This doesn't change any functionality so far, since
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* get_dma_pages() shouldn't be used on Atari anyway anymore (better
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* use atari_stram_alloc()), and the Atari SCSI drivers don't need DMA
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* memory. But unfortunately there's now no kind of warning (even not
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* a NULL return value) if you use get_dma_pages() nevertheless :-(
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* You just will get non-DMA-able memory...
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*/
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mach_max_dma_address = 0xffffffff;
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}
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#endif
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}
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void atari_stram_mem_init_hook (void)
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{
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mem_init_done = 1;
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}
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/*
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* This is main public interface: somehow allocate a ST-RAM block
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* There are three strategies:
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*
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* - If we're before mem_init(), we have to make a static allocation. The
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* region is taken in the kernel data area (if the kernel is in ST-RAM) or
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* from the start of ST-RAM (if the kernel is in TT-RAM) and added to the
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* rsvd_stram_* region. The ST-RAM is somewhere in the middle of kernel
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* address space in the latter case.
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*
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* - If mem_init() already has been called and ST-RAM swapping is enabled,
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* try to get the memory from the (pseudo) swap-space, either free already
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* or by moving some other pages out of the swap.
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*
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* - If mem_init() already has been called, and ST-RAM swapping is not
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* enabled, the only possibility is to try with __get_dma_pages(). This has
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* the disadvantage that it's very hard to get more than 1 page, and it is
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* likely to fail :-(
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*
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*/
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void *atari_stram_alloc(long size, const char *owner)
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{
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void *addr = NULL;
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BLOCK *block;
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int flags;
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DPRINTK("atari_stram_alloc(size=%08lx,owner=%s)\n", size, owner);
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size = ALIGN_IF_SWAP(size);
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DPRINTK( "atari_stram_alloc: rounded size = %08lx\n", size );
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#ifdef CONFIG_STRAM_SWAP
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if (max_swap_size) {
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/* If swapping is active: make some free space in the swap
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"device". */
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DPRINTK( "atari_stram_alloc: after mem_init, swapping ok, "
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"calling get_region\n" );
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addr = get_stram_region( N_PAGES(size) );
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flags = BLOCK_INSWAP;
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}
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else
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#endif
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if (!mem_init_done)
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return alloc_bootmem_low(size);
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else {
|
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/* After mem_init() and no swapping: can only resort to
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* __get_dma_pages() */
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addr = (void *)__get_dma_pages(GFP_KERNEL, get_order(size));
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flags = BLOCK_GFP;
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DPRINTK( "atari_stram_alloc: after mem_init, swapping off, "
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"get_pages=%p\n", addr );
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}
|
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|
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if (addr) {
|
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if (!(block = add_region( addr, size ))) {
|
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/* out of memory for BLOCK structure :-( */
|
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DPRINTK( "atari_stram_alloc: out of mem for BLOCK -- "
|
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"freeing again\n" );
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#ifdef CONFIG_STRAM_SWAP
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if (flags == BLOCK_INSWAP)
|
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free_stram_region( SWAP_NR(addr), N_PAGES(size) );
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else
|
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#endif
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free_pages((unsigned long)addr, get_order(size));
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return( NULL );
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}
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block->owner = owner;
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block->flags |= flags;
|
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}
|
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return( addr );
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}
|
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|
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void atari_stram_free( void *addr )
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|
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{
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BLOCK *block;
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|
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DPRINTK( "atari_stram_free(addr=%p)\n", addr );
|
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|
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if (!(block = find_region( addr ))) {
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printk( KERN_ERR "Attempt to free non-allocated ST-RAM block at %p "
|
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"from %p\n", addr, __builtin_return_address(0) );
|
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return;
|
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}
|
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DPRINTK( "atari_stram_free: found block (%p): size=%08lx, owner=%s, "
|
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"flags=%02x\n", block, block->size, block->owner, block->flags );
|
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|
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#ifdef CONFIG_STRAM_SWAP
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if (!max_swap_size) {
|
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#endif
|
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if (block->flags & BLOCK_GFP) {
|
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DPRINTK("atari_stram_free: is kmalloced, order_size=%d\n",
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get_order(block->size));
|
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free_pages((unsigned long)addr, get_order(block->size));
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}
|
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else
|
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goto fail;
|
||
#ifdef CONFIG_STRAM_SWAP
|
||
}
|
||
else if (block->flags & BLOCK_INSWAP) {
|
||
DPRINTK( "atari_stram_free: is swap-alloced\n" );
|
||
free_stram_region( SWAP_NR(block->start), N_PAGES(block->size) );
|
||
}
|
||
else
|
||
goto fail;
|
||
#endif
|
||
remove_region( block );
|
||
return;
|
||
|
||
fail:
|
||
printk( KERN_ERR "atari_stram_free: cannot free block at %p "
|
||
"(called from %p)\n", addr, __builtin_return_address(0) );
|
||
}
|
||
|
||
|
||
#ifdef CONFIG_STRAM_SWAP
|
||
|
||
|
||
/* ------------------------------------------------------------------------ */
|
||
/* Main Swapping Functions */
|
||
/* ------------------------------------------------------------------------ */
|
||
|
||
|
||
/*
|
||
* Initialize ST-RAM swap device
|
||
* (lots copied and modified from sys_swapon() in mm/swapfile.c)
|
||
*/
|
||
static int __init swap_init(void *start_mem, void *swap_data)
|
||
{
|
||
static struct dentry fake_dentry;
|
||
static struct vfsmount fake_vfsmnt;
|
||
struct swap_info_struct *p;
|
||
struct inode swap_inode;
|
||
unsigned int type;
|
||
void *addr;
|
||
int i, j, k, prev;
|
||
|
||
DPRINTK("swap_init(start_mem=%p, swap_data=%p)\n",
|
||
start_mem, swap_data);
|
||
|
||
/* need at least one page for swapping to (and this also isn't very
|
||
* much... :-) */
|
||
if (swap_end - swap_start < 2*PAGE_SIZE) {
|
||
printk( KERN_WARNING "stram_swap_init: swap space too small\n" );
|
||
return( 0 );
|
||
}
|
||
|
||
/* find free slot in swap_info */
|
||
for( p = swap_info, type = 0; type < nr_swapfiles; type++, p++ )
|
||
if (!(p->flags & SWP_USED))
|
||
break;
|
||
if (type >= MAX_SWAPFILES) {
|
||
printk( KERN_WARNING "stram_swap_init: max. number of "
|
||
"swap devices exhausted\n" );
|
||
return( 0 );
|
||
}
|
||
if (type >= nr_swapfiles)
|
||
nr_swapfiles = type+1;
|
||
|
||
stram_swap_info = p;
|
||
stram_swap_type = type;
|
||
|
||
/* fake some dir cache entries to give us some name in /dev/swaps */
|
||
fake_dentry.d_parent = &fake_dentry;
|
||
fake_dentry.d_name.name = "stram (internal)";
|
||
fake_dentry.d_name.len = 16;
|
||
fake_vfsmnt.mnt_parent = &fake_vfsmnt;
|
||
|
||
p->flags = SWP_USED;
|
||
p->swap_file = &fake_dentry;
|
||
p->swap_vfsmnt = &fake_vfsmnt;
|
||
p->swap_map = swap_data;
|
||
p->cluster_nr = 0;
|
||
p->next = -1;
|
||
p->prio = 0x7ff0; /* a rather high priority, but not the higest
|
||
* to give the user a chance to override */
|
||
|
||
/* call stram_open() directly, avoids at least the overhead in
|
||
* constructing a dummy file structure... */
|
||
swap_inode.i_rdev = MKDEV( STRAM_MAJOR, STRAM_MINOR );
|
||
stram_open( &swap_inode, MAGIC_FILE_P );
|
||
p->max = SWAP_NR(swap_end);
|
||
|
||
/* initialize swap_map: set regions that are already allocated or belong
|
||
* to kernel data space to SWAP_MAP_BAD, otherwise to free */
|
||
j = 0; /* # of free pages */
|
||
k = 0; /* # of already allocated pages (from pre-mem_init stram_alloc()) */
|
||
p->lowest_bit = 0;
|
||
p->highest_bit = 0;
|
||
for( i = 1, addr = SWAP_ADDR(1); i < p->max;
|
||
i++, addr += PAGE_SIZE ) {
|
||
if (in_some_region( addr )) {
|
||
p->swap_map[i] = SWAP_MAP_BAD;
|
||
++k;
|
||
}
|
||
else if (kernel_in_stram && addr < start_mem ) {
|
||
p->swap_map[i] = SWAP_MAP_BAD;
|
||
}
|
||
else {
|
||
p->swap_map[i] = 0;
|
||
++j;
|
||
if (!p->lowest_bit) p->lowest_bit = i;
|
||
p->highest_bit = i;
|
||
}
|
||
}
|
||
/* first page always reserved (and doesn't really belong to swap space) */
|
||
p->swap_map[0] = SWAP_MAP_BAD;
|
||
|
||
/* now swapping to this device ok */
|
||
p->pages = j + k;
|
||
swap_list_lock();
|
||
nr_swap_pages += j;
|
||
p->flags = SWP_WRITEOK;
|
||
|
||
/* insert swap space into swap_list */
|
||
prev = -1;
|
||
for (i = swap_list.head; i >= 0; i = swap_info[i].next) {
|
||
if (p->prio >= swap_info[i].prio) {
|
||
break;
|
||
}
|
||
prev = i;
|
||
}
|
||
p->next = i;
|
||
if (prev < 0) {
|
||
swap_list.head = swap_list.next = p - swap_info;
|
||
} else {
|
||
swap_info[prev].next = p - swap_info;
|
||
}
|
||
swap_list_unlock();
|
||
|
||
printk( KERN_INFO "Using %dk (%d pages) of ST-RAM as swap space.\n",
|
||
p->pages << 2, p->pages );
|
||
return( 1 );
|
||
}
|
||
|
||
|
||
/*
|
||
* The swap entry has been read in advance, and we return 1 to indicate
|
||
* that the page has been used or is no longer needed.
|
||
*
|
||
* Always set the resulting pte to be nowrite (the same as COW pages
|
||
* after one process has exited). We don't know just how many PTEs will
|
||
* share this swap entry, so be cautious and let do_wp_page work out
|
||
* what to do if a write is requested later.
|
||
*/
|
||
static inline void unswap_pte(struct vm_area_struct * vma, unsigned long
|
||
address, pte_t *dir, swp_entry_t entry,
|
||
struct page *page)
|
||
{
|
||
pte_t pte = *dir;
|
||
|
||
if (pte_none(pte))
|
||
return;
|
||
if (pte_present(pte)) {
|
||
/* If this entry is swap-cached, then page must already
|
||
hold the right address for any copies in physical
|
||
memory */
|
||
if (pte_page(pte) != page)
|
||
return;
|
||
/* We will be removing the swap cache in a moment, so... */
|
||
set_pte(dir, pte_mkdirty(pte));
|
||
return;
|
||
}
|
||
if (pte_val(pte) != entry.val)
|
||
return;
|
||
|
||
DPRINTK("unswap_pte: replacing entry %08lx by new page %p",
|
||
entry.val, page);
|
||
set_pte(dir, pte_mkdirty(mk_pte(page, vma->vm_page_prot)));
|
||
swap_free(entry);
|
||
get_page(page);
|
||
inc_mm_counter(vma->vm_mm, rss);
|
||
}
|
||
|
||
static inline void unswap_pmd(struct vm_area_struct * vma, pmd_t *dir,
|
||
unsigned long address, unsigned long size,
|
||
unsigned long offset, swp_entry_t entry,
|
||
struct page *page)
|
||
{
|
||
pte_t * pte;
|
||
unsigned long end;
|
||
|
||
if (pmd_none(*dir))
|
||
return;
|
||
if (pmd_bad(*dir)) {
|
||
pmd_ERROR(*dir);
|
||
pmd_clear(dir);
|
||
return;
|
||
}
|
||
pte = pte_offset_kernel(dir, address);
|
||
offset += address & PMD_MASK;
|
||
address &= ~PMD_MASK;
|
||
end = address + size;
|
||
if (end > PMD_SIZE)
|
||
end = PMD_SIZE;
|
||
do {
|
||
unswap_pte(vma, offset+address-vma->vm_start, pte, entry, page);
|
||
address += PAGE_SIZE;
|
||
pte++;
|
||
} while (address < end);
|
||
}
|
||
|
||
static inline void unswap_pgd(struct vm_area_struct * vma, pgd_t *dir,
|
||
unsigned long address, unsigned long size,
|
||
swp_entry_t entry, struct page *page)
|
||
{
|
||
pmd_t * pmd;
|
||
unsigned long offset, end;
|
||
|
||
if (pgd_none(*dir))
|
||
return;
|
||
if (pgd_bad(*dir)) {
|
||
pgd_ERROR(*dir);
|
||
pgd_clear(dir);
|
||
return;
|
||
}
|
||
pmd = pmd_offset(dir, address);
|
||
offset = address & PGDIR_MASK;
|
||
address &= ~PGDIR_MASK;
|
||
end = address + size;
|
||
if (end > PGDIR_SIZE)
|
||
end = PGDIR_SIZE;
|
||
do {
|
||
unswap_pmd(vma, pmd, address, end - address, offset, entry,
|
||
page);
|
||
address = (address + PMD_SIZE) & PMD_MASK;
|
||
pmd++;
|
||
} while (address < end);
|
||
}
|
||
|
||
static void unswap_vma(struct vm_area_struct * vma, pgd_t *pgdir,
|
||
swp_entry_t entry, struct page *page)
|
||
{
|
||
unsigned long start = vma->vm_start, end = vma->vm_end;
|
||
|
||
do {
|
||
unswap_pgd(vma, pgdir, start, end - start, entry, page);
|
||
start = (start + PGDIR_SIZE) & PGDIR_MASK;
|
||
pgdir++;
|
||
} while (start < end);
|
||
}
|
||
|
||
static void unswap_process(struct mm_struct * mm, swp_entry_t entry,
|
||
struct page *page)
|
||
{
|
||
struct vm_area_struct* vma;
|
||
|
||
/*
|
||
* Go through process' page directory.
|
||
*/
|
||
if (!mm)
|
||
return;
|
||
for (vma = mm->mmap; vma; vma = vma->vm_next) {
|
||
pgd_t * pgd = pgd_offset(mm, vma->vm_start);
|
||
unswap_vma(vma, pgd, entry, page);
|
||
}
|
||
}
|
||
|
||
|
||
static int unswap_by_read(unsigned short *map, unsigned long max,
|
||
unsigned long start, unsigned long n_pages)
|
||
{
|
||
struct task_struct *p;
|
||
struct page *page;
|
||
swp_entry_t entry;
|
||
unsigned long i;
|
||
|
||
DPRINTK( "unswapping %lu..%lu by reading in\n",
|
||
start, start+n_pages-1 );
|
||
|
||
for( i = start; i < start+n_pages; ++i ) {
|
||
if (map[i] == SWAP_MAP_BAD) {
|
||
printk( KERN_ERR "get_stram_region: page %lu already "
|
||
"reserved??\n", i );
|
||
continue;
|
||
}
|
||
|
||
if (map[i]) {
|
||
entry = swp_entry(stram_swap_type, i);
|
||
DPRINTK("unswap: map[i=%lu]=%u nr_swap=%ld\n",
|
||
i, map[i], nr_swap_pages);
|
||
|
||
swap_device_lock(stram_swap_info);
|
||
map[i]++;
|
||
swap_device_unlock(stram_swap_info);
|
||
/* Get a page for the entry, using the existing
|
||
swap cache page if there is one. Otherwise,
|
||
get a clean page and read the swap into it. */
|
||
page = read_swap_cache_async(entry, NULL, 0);
|
||
if (!page) {
|
||
swap_free(entry);
|
||
return -ENOMEM;
|
||
}
|
||
read_lock(&tasklist_lock);
|
||
for_each_process(p)
|
||
unswap_process(p->mm, entry, page);
|
||
read_unlock(&tasklist_lock);
|
||
shmem_unuse(entry, page);
|
||
/* Now get rid of the extra reference to the
|
||
temporary page we've been using. */
|
||
if (PageSwapCache(page))
|
||
delete_from_swap_cache(page);
|
||
__free_page(page);
|
||
#ifdef DO_PROC
|
||
stat_swap_force++;
|
||
#endif
|
||
}
|
||
|
||
DPRINTK( "unswap: map[i=%lu]=%u nr_swap=%ld\n",
|
||
i, map[i], nr_swap_pages );
|
||
swap_list_lock();
|
||
swap_device_lock(stram_swap_info);
|
||
map[i] = SWAP_MAP_BAD;
|
||
if (stram_swap_info->lowest_bit == i)
|
||
stram_swap_info->lowest_bit++;
|
||
if (stram_swap_info->highest_bit == i)
|
||
stram_swap_info->highest_bit--;
|
||
--nr_swap_pages;
|
||
swap_device_unlock(stram_swap_info);
|
||
swap_list_unlock();
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
* reserve a region in ST-RAM swap space for an allocation
|
||
*/
|
||
static void *get_stram_region( unsigned long n_pages )
|
||
{
|
||
unsigned short *map = stram_swap_info->swap_map;
|
||
unsigned long max = stram_swap_info->max;
|
||
unsigned long start, total_free, region_free;
|
||
int err;
|
||
void *ret = NULL;
|
||
|
||
DPRINTK( "get_stram_region(n_pages=%lu)\n", n_pages );
|
||
|
||
down(&stram_swap_sem);
|
||
|
||
/* disallow writing to the swap device now */
|
||
stram_swap_info->flags = SWP_USED;
|
||
|
||
/* find a region of n_pages pages in the swap space including as much free
|
||
* pages as possible (and excluding any already-reserved pages). */
|
||
if (!(start = find_free_region( n_pages, &total_free, ®ion_free )))
|
||
goto end;
|
||
DPRINTK( "get_stram_region: region starts at %lu, has %lu free pages\n",
|
||
start, region_free );
|
||
|
||
err = unswap_by_read(map, max, start, n_pages);
|
||
if (err)
|
||
goto end;
|
||
|
||
ret = SWAP_ADDR(start);
|
||
end:
|
||
/* allow using swap device again */
|
||
stram_swap_info->flags = SWP_WRITEOK;
|
||
up(&stram_swap_sem);
|
||
DPRINTK( "get_stram_region: returning %p\n", ret );
|
||
return( ret );
|
||
}
|
||
|
||
|
||
/*
|
||
* free a reserved region in ST-RAM swap space
|
||
*/
|
||
static void free_stram_region( unsigned long offset, unsigned long n_pages )
|
||
{
|
||
unsigned short *map = stram_swap_info->swap_map;
|
||
|
||
DPRINTK( "free_stram_region(offset=%lu,n_pages=%lu)\n", offset, n_pages );
|
||
|
||
if (offset < 1 || offset + n_pages > stram_swap_info->max) {
|
||
printk( KERN_ERR "free_stram_region: Trying to free non-ST-RAM\n" );
|
||
return;
|
||
}
|
||
|
||
swap_list_lock();
|
||
swap_device_lock(stram_swap_info);
|
||
/* un-reserve the freed pages */
|
||
for( ; n_pages > 0; ++offset, --n_pages ) {
|
||
if (map[offset] != SWAP_MAP_BAD)
|
||
printk( KERN_ERR "free_stram_region: Swap page %lu was not "
|
||
"reserved\n", offset );
|
||
map[offset] = 0;
|
||
}
|
||
|
||
/* update swapping meta-data */
|
||
if (offset < stram_swap_info->lowest_bit)
|
||
stram_swap_info->lowest_bit = offset;
|
||
if (offset+n_pages-1 > stram_swap_info->highest_bit)
|
||
stram_swap_info->highest_bit = offset+n_pages-1;
|
||
if (stram_swap_info->prio > swap_info[swap_list.next].prio)
|
||
swap_list.next = swap_list.head;
|
||
nr_swap_pages += n_pages;
|
||
swap_device_unlock(stram_swap_info);
|
||
swap_list_unlock();
|
||
}
|
||
|
||
|
||
/* ------------------------------------------------------------------------ */
|
||
/* Utility Functions for Swapping */
|
||
/* ------------------------------------------------------------------------ */
|
||
|
||
|
||
/* is addr in some of the allocated regions? */
|
||
static int in_some_region(void *addr)
|
||
{
|
||
BLOCK *p;
|
||
|
||
for( p = alloc_list; p; p = p->next ) {
|
||
if (p->start <= addr && addr < p->start + p->size)
|
||
return( 1 );
|
||
}
|
||
return( 0 );
|
||
}
|
||
|
||
|
||
static unsigned long find_free_region(unsigned long n_pages,
|
||
unsigned long *total_free,
|
||
unsigned long *region_free)
|
||
{
|
||
unsigned short *map = stram_swap_info->swap_map;
|
||
unsigned long max = stram_swap_info->max;
|
||
unsigned long head, tail, max_start;
|
||
long nfree, max_free;
|
||
|
||
/* first scan the swap space for a suitable place for the allocation */
|
||
head = 1;
|
||
max_start = 0;
|
||
max_free = -1;
|
||
*total_free = 0;
|
||
|
||
start_over:
|
||
/* increment tail until final window size reached, and count free pages */
|
||
nfree = 0;
|
||
for( tail = head; tail-head < n_pages && tail < max; ++tail ) {
|
||
if (map[tail] == SWAP_MAP_BAD) {
|
||
head = tail+1;
|
||
goto start_over;
|
||
}
|
||
if (!map[tail]) {
|
||
++nfree;
|
||
++*total_free;
|
||
}
|
||
}
|
||
if (tail-head < n_pages)
|
||
goto out;
|
||
if (nfree > max_free) {
|
||
max_start = head;
|
||
max_free = nfree;
|
||
if (max_free >= n_pages)
|
||
/* don't need more free pages... :-) */
|
||
goto out;
|
||
}
|
||
|
||
/* now shift the window and look for the area where as much pages as
|
||
* possible are free */
|
||
while( tail < max ) {
|
||
nfree -= (map[head++] == 0);
|
||
if (map[tail] == SWAP_MAP_BAD) {
|
||
head = tail+1;
|
||
goto start_over;
|
||
}
|
||
if (!map[tail]) {
|
||
++nfree;
|
||
++*total_free;
|
||
}
|
||
++tail;
|
||
if (nfree > max_free) {
|
||
max_start = head;
|
||
max_free = nfree;
|
||
if (max_free >= n_pages)
|
||
/* don't need more free pages... :-) */
|
||
goto out;
|
||
}
|
||
}
|
||
|
||
out:
|
||
if (max_free < 0) {
|
||
printk( KERN_NOTICE "get_stram_region: ST-RAM too full or fragmented "
|
||
"-- can't allocate %lu pages\n", n_pages );
|
||
return( 0 );
|
||
}
|
||
|
||
*region_free = max_free;
|
||
return( max_start );
|
||
}
|
||
|
||
|
||
/* setup parameters from command line */
|
||
void __init stram_swap_setup(char *str, int *ints)
|
||
{
|
||
if (ints[0] >= 1)
|
||
max_swap_size = ((ints[1] < 0 ? 0 : ints[1]) * 1024) & PAGE_MASK;
|
||
}
|
||
|
||
|
||
/* ------------------------------------------------------------------------ */
|
||
/* ST-RAM device */
|
||
/* ------------------------------------------------------------------------ */
|
||
|
||
static int refcnt;
|
||
|
||
static void do_stram_request(request_queue_t *q)
|
||
{
|
||
struct request *req;
|
||
|
||
while ((req = elv_next_request(q)) != NULL) {
|
||
void *start = swap_start + (req->sector << 9);
|
||
unsigned long len = req->current_nr_sectors << 9;
|
||
if ((start + len) > swap_end) {
|
||
printk( KERN_ERR "stram: bad access beyond end of device: "
|
||
"block=%ld, count=%d\n",
|
||
req->sector,
|
||
req->current_nr_sectors );
|
||
end_request(req, 0);
|
||
continue;
|
||
}
|
||
|
||
if (req->cmd == READ) {
|
||
memcpy(req->buffer, start, len);
|
||
#ifdef DO_PROC
|
||
stat_swap_read += N_PAGES(len);
|
||
#endif
|
||
}
|
||
else {
|
||
memcpy(start, req->buffer, len);
|
||
#ifdef DO_PROC
|
||
stat_swap_write += N_PAGES(len);
|
||
#endif
|
||
}
|
||
end_request(req, 1);
|
||
}
|
||
}
|
||
|
||
|
||
static int stram_open( struct inode *inode, struct file *filp )
|
||
{
|
||
if (filp != MAGIC_FILE_P) {
|
||
printk( KERN_NOTICE "Only kernel can open ST-RAM device\n" );
|
||
return( -EPERM );
|
||
}
|
||
if (refcnt)
|
||
return( -EBUSY );
|
||
++refcnt;
|
||
return( 0 );
|
||
}
|
||
|
||
static int stram_release( struct inode *inode, struct file *filp )
|
||
{
|
||
if (filp != MAGIC_FILE_P) {
|
||
printk( KERN_NOTICE "Only kernel can close ST-RAM device\n" );
|
||
return( -EPERM );
|
||
}
|
||
if (refcnt > 0)
|
||
--refcnt;
|
||
return( 0 );
|
||
}
|
||
|
||
|
||
static struct block_device_operations stram_fops = {
|
||
.open = stram_open,
|
||
.release = stram_release,
|
||
};
|
||
|
||
static struct gendisk *stram_disk;
|
||
static struct request_queue *stram_queue;
|
||
static DEFINE_SPINLOCK(stram_lock);
|
||
|
||
int __init stram_device_init(void)
|
||
{
|
||
if (!MACH_IS_ATARI)
|
||
/* no point in initializing this, I hope */
|
||
return -ENXIO;
|
||
|
||
if (!max_swap_size)
|
||
/* swapping not enabled */
|
||
return -ENXIO;
|
||
stram_disk = alloc_disk(1);
|
||
if (!stram_disk)
|
||
return -ENOMEM;
|
||
|
||
if (register_blkdev(STRAM_MAJOR, "stram")) {
|
||
put_disk(stram_disk);
|
||
return -ENXIO;
|
||
}
|
||
|
||
stram_queue = blk_init_queue(do_stram_request, &stram_lock);
|
||
if (!stram_queue) {
|
||
unregister_blkdev(STRAM_MAJOR, "stram");
|
||
put_disk(stram_disk);
|
||
return -ENOMEM;
|
||
}
|
||
|
||
stram_disk->major = STRAM_MAJOR;
|
||
stram_disk->first_minor = STRAM_MINOR;
|
||
stram_disk->fops = &stram_fops;
|
||
stram_disk->queue = stram_queue;
|
||
sprintf(stram_disk->disk_name, "stram");
|
||
set_capacity(stram_disk, (swap_end - swap_start)/512);
|
||
add_disk(stram_disk);
|
||
return 0;
|
||
}
|
||
|
||
|
||
|
||
/* ------------------------------------------------------------------------ */
|
||
/* Misc Utility Functions */
|
||
/* ------------------------------------------------------------------------ */
|
||
|
||
/* reserve a range of pages */
|
||
static void reserve_region(void *start, void *end)
|
||
{
|
||
reserve_bootmem (virt_to_phys(start), end - start);
|
||
}
|
||
|
||
#endif /* CONFIG_STRAM_SWAP */
|
||
|
||
|
||
/* ------------------------------------------------------------------------ */
|
||
/* Region Management */
|
||
/* ------------------------------------------------------------------------ */
|
||
|
||
|
||
/* insert a region into the alloced list (sorted) */
|
||
static BLOCK *add_region( void *addr, unsigned long size )
|
||
{
|
||
BLOCK **p, *n = NULL;
|
||
int i;
|
||
|
||
for( i = 0; i < N_STATIC_BLOCKS; ++i ) {
|
||
if (static_blocks[i].flags & BLOCK_FREE) {
|
||
n = &static_blocks[i];
|
||
n->flags = 0;
|
||
break;
|
||
}
|
||
}
|
||
if (!n && mem_init_done) {
|
||
/* if statics block pool exhausted and we can call kmalloc() already
|
||
* (after mem_init()), try that */
|
||
n = kmalloc( sizeof(BLOCK), GFP_KERNEL );
|
||
if (n)
|
||
n->flags = BLOCK_KMALLOCED;
|
||
}
|
||
if (!n) {
|
||
printk( KERN_ERR "Out of memory for ST-RAM descriptor blocks\n" );
|
||
return( NULL );
|
||
}
|
||
n->start = addr;
|
||
n->size = size;
|
||
|
||
for( p = &alloc_list; *p; p = &((*p)->next) )
|
||
if ((*p)->start > addr) break;
|
||
n->next = *p;
|
||
*p = n;
|
||
|
||
return( n );
|
||
}
|
||
|
||
|
||
/* find a region (by start addr) in the alloced list */
|
||
static BLOCK *find_region( void *addr )
|
||
{
|
||
BLOCK *p;
|
||
|
||
for( p = alloc_list; p; p = p->next ) {
|
||
if (p->start == addr)
|
||
return( p );
|
||
if (p->start > addr)
|
||
break;
|
||
}
|
||
return( NULL );
|
||
}
|
||
|
||
|
||
/* remove a block from the alloced list */
|
||
static int remove_region( BLOCK *block )
|
||
{
|
||
BLOCK **p;
|
||
|
||
for( p = &alloc_list; *p; p = &((*p)->next) )
|
||
if (*p == block) break;
|
||
if (!*p)
|
||
return( 0 );
|
||
|
||
*p = block->next;
|
||
if (block->flags & BLOCK_KMALLOCED)
|
||
kfree( block );
|
||
else
|
||
block->flags |= BLOCK_FREE;
|
||
return( 1 );
|
||
}
|
||
|
||
|
||
|
||
/* ------------------------------------------------------------------------ */
|
||
/* /proc statistics file stuff */
|
||
/* ------------------------------------------------------------------------ */
|
||
|
||
#ifdef DO_PROC
|
||
|
||
#define PRINT_PROC(fmt,args...) len += sprintf( buf+len, fmt, ##args )
|
||
|
||
int get_stram_list( char *buf )
|
||
{
|
||
int len = 0;
|
||
BLOCK *p;
|
||
#ifdef CONFIG_STRAM_SWAP
|
||
int i;
|
||
unsigned short *map = stram_swap_info->swap_map;
|
||
unsigned long max = stram_swap_info->max;
|
||
unsigned free = 0, used = 0, rsvd = 0;
|
||
#endif
|
||
|
||
#ifdef CONFIG_STRAM_SWAP
|
||
if (max_swap_size) {
|
||
for( i = 1; i < max; ++i ) {
|
||
if (!map[i])
|
||
++free;
|
||
else if (map[i] == SWAP_MAP_BAD)
|
||
++rsvd;
|
||
else
|
||
++used;
|
||
}
|
||
PRINT_PROC(
|
||
"Total ST-RAM: %8u kB\n"
|
||
"Total ST-RAM swap: %8lu kB\n"
|
||
"Free swap: %8u kB\n"
|
||
"Used swap: %8u kB\n"
|
||
"Allocated swap: %8u kB\n"
|
||
"Swap Reads: %8u\n"
|
||
"Swap Writes: %8u\n"
|
||
"Swap Forced Reads: %8u\n",
|
||
(stram_end - stram_start) >> 10,
|
||
(max-1) << (PAGE_SHIFT-10),
|
||
free << (PAGE_SHIFT-10),
|
||
used << (PAGE_SHIFT-10),
|
||
rsvd << (PAGE_SHIFT-10),
|
||
stat_swap_read,
|
||
stat_swap_write,
|
||
stat_swap_force );
|
||
}
|
||
else {
|
||
#endif
|
||
PRINT_PROC( "ST-RAM swapping disabled\n" );
|
||
PRINT_PROC("Total ST-RAM: %8u kB\n",
|
||
(stram_end - stram_start) >> 10);
|
||
#ifdef CONFIG_STRAM_SWAP
|
||
}
|
||
#endif
|
||
|
||
PRINT_PROC( "Allocated regions:\n" );
|
||
for( p = alloc_list; p; p = p->next ) {
|
||
if (len + 50 >= PAGE_SIZE)
|
||
break;
|
||
PRINT_PROC("0x%08lx-0x%08lx: %s (",
|
||
virt_to_phys(p->start),
|
||
virt_to_phys(p->start+p->size-1),
|
||
p->owner);
|
||
if (p->flags & BLOCK_GFP)
|
||
PRINT_PROC( "page-alloced)\n" );
|
||
else if (p->flags & BLOCK_INSWAP)
|
||
PRINT_PROC( "in swap)\n" );
|
||
else
|
||
PRINT_PROC( "??)\n" );
|
||
}
|
||
|
||
return( len );
|
||
}
|
||
|
||
#endif
|
||
|
||
|
||
/*
|
||
* Local variables:
|
||
* c-indent-level: 4
|
||
* tab-width: 4
|
||
* End:
|
||
*/
|