WSL2-Linux-Kernel/drivers/video/omap2/vram.c

660 строки
14 KiB
C
Исходник Обычный вид История

/*
* VRAM manager for OMAP
*
* Copyright (C) 2009 Nokia Corporation
* Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/*#define DEBUG*/
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/list.h>
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 11:04:11 +03:00
#include <linux/slab.h>
#include <linux/seq_file.h>
#include <linux/memblock.h>
#include <linux/completion.h>
#include <linux/debugfs.h>
#include <linux/jiffies.h>
#include <linux/module.h>
#include <asm/setup.h>
#include <plat/sram.h>
#include <plat/vram.h>
#include <plat/dma.h>
#ifdef DEBUG
#define DBG(format, ...) pr_debug("VRAM: " format, ## __VA_ARGS__)
#else
#define DBG(format, ...)
#endif
#define OMAP2_SRAM_START 0x40200000
/* Maximum size, in reality this is smaller if SRAM is partially locked. */
#define OMAP2_SRAM_SIZE 0xa0000 /* 640k */
/* postponed regions are used to temporarily store region information at boot
* time when we cannot yet allocate the region list */
#define MAX_POSTPONED_REGIONS 10
static bool vram_initialized;
static int postponed_cnt;
static struct {
unsigned long paddr;
size_t size;
} postponed_regions[MAX_POSTPONED_REGIONS];
struct vram_alloc {
struct list_head list;
unsigned long paddr;
unsigned pages;
};
struct vram_region {
struct list_head list;
struct list_head alloc_list;
unsigned long paddr;
unsigned pages;
};
static DEFINE_MUTEX(region_mutex);
static LIST_HEAD(region_list);
static inline int region_mem_type(unsigned long paddr)
{
if (paddr >= OMAP2_SRAM_START &&
paddr < OMAP2_SRAM_START + OMAP2_SRAM_SIZE)
return OMAP_VRAM_MEMTYPE_SRAM;
else
return OMAP_VRAM_MEMTYPE_SDRAM;
}
static struct vram_region *omap_vram_create_region(unsigned long paddr,
unsigned pages)
{
struct vram_region *rm;
rm = kzalloc(sizeof(*rm), GFP_KERNEL);
if (rm) {
INIT_LIST_HEAD(&rm->alloc_list);
rm->paddr = paddr;
rm->pages = pages;
}
return rm;
}
#if 0
static void omap_vram_free_region(struct vram_region *vr)
{
list_del(&vr->list);
kfree(vr);
}
#endif
static struct vram_alloc *omap_vram_create_allocation(struct vram_region *vr,
unsigned long paddr, unsigned pages)
{
struct vram_alloc *va;
struct vram_alloc *new;
new = kzalloc(sizeof(*va), GFP_KERNEL);
if (!new)
return NULL;
new->paddr = paddr;
new->pages = pages;
list_for_each_entry(va, &vr->alloc_list, list) {
if (va->paddr > new->paddr)
break;
}
list_add_tail(&new->list, &va->list);
return new;
}
static void omap_vram_free_allocation(struct vram_alloc *va)
{
list_del(&va->list);
kfree(va);
}
int omap_vram_add_region(unsigned long paddr, size_t size)
{
struct vram_region *rm;
unsigned pages;
if (vram_initialized) {
DBG("adding region paddr %08lx size %d\n",
paddr, size);
size &= PAGE_MASK;
pages = size >> PAGE_SHIFT;
rm = omap_vram_create_region(paddr, pages);
if (rm == NULL)
return -ENOMEM;
list_add(&rm->list, &region_list);
} else {
if (postponed_cnt == MAX_POSTPONED_REGIONS)
return -ENOMEM;
postponed_regions[postponed_cnt].paddr = paddr;
postponed_regions[postponed_cnt].size = size;
++postponed_cnt;
}
return 0;
}
int omap_vram_free(unsigned long paddr, size_t size)
{
struct vram_region *rm;
struct vram_alloc *alloc;
unsigned start, end;
DBG("free mem paddr %08lx size %d\n", paddr, size);
size = PAGE_ALIGN(size);
mutex_lock(&region_mutex);
list_for_each_entry(rm, &region_list, list) {
list_for_each_entry(alloc, &rm->alloc_list, list) {
start = alloc->paddr;
end = alloc->paddr + (alloc->pages >> PAGE_SHIFT);
if (start >= paddr && end < paddr + size)
goto found;
}
}
mutex_unlock(&region_mutex);
return -EINVAL;
found:
omap_vram_free_allocation(alloc);
mutex_unlock(&region_mutex);
return 0;
}
EXPORT_SYMBOL(omap_vram_free);
static int _omap_vram_reserve(unsigned long paddr, unsigned pages)
{
struct vram_region *rm;
struct vram_alloc *alloc;
size_t size;
size = pages << PAGE_SHIFT;
list_for_each_entry(rm, &region_list, list) {
unsigned long start, end;
DBG("checking region %lx %d\n", rm->paddr, rm->pages);
if (region_mem_type(rm->paddr) != region_mem_type(paddr))
continue;
start = rm->paddr;
end = start + (rm->pages << PAGE_SHIFT) - 1;
if (start > paddr || end < paddr + size - 1)
continue;
DBG("block ok, checking allocs\n");
list_for_each_entry(alloc, &rm->alloc_list, list) {
end = alloc->paddr - 1;
if (start <= paddr && end >= paddr + size - 1)
goto found;
start = alloc->paddr + (alloc->pages << PAGE_SHIFT);
}
end = rm->paddr + (rm->pages << PAGE_SHIFT) - 1;
if (!(start <= paddr && end >= paddr + size - 1))
continue;
found:
DBG("found area start %lx, end %lx\n", start, end);
if (omap_vram_create_allocation(rm, paddr, pages) == NULL)
return -ENOMEM;
return 0;
}
return -ENOMEM;
}
int omap_vram_reserve(unsigned long paddr, size_t size)
{
unsigned pages;
int r;
DBG("reserve mem paddr %08lx size %d\n", paddr, size);
size = PAGE_ALIGN(size);
pages = size >> PAGE_SHIFT;
mutex_lock(&region_mutex);
r = _omap_vram_reserve(paddr, pages);
mutex_unlock(&region_mutex);
return r;
}
EXPORT_SYMBOL(omap_vram_reserve);
static void _omap_vram_dma_cb(int lch, u16 ch_status, void *data)
{
struct completion *compl = data;
complete(compl);
}
static int _omap_vram_clear(u32 paddr, unsigned pages)
{
struct completion compl;
unsigned elem_count;
unsigned frame_count;
int r;
int lch;
init_completion(&compl);
r = omap_request_dma(OMAP_DMA_NO_DEVICE, "VRAM DMA",
_omap_vram_dma_cb,
&compl, &lch);
if (r) {
pr_err("VRAM: request_dma failed for memory clear\n");
return -EBUSY;
}
elem_count = pages * PAGE_SIZE / 4;
frame_count = 1;
omap_set_dma_transfer_params(lch, OMAP_DMA_DATA_TYPE_S32,
elem_count, frame_count,
OMAP_DMA_SYNC_ELEMENT,
0, 0);
omap_set_dma_dest_params(lch, 0, OMAP_DMA_AMODE_POST_INC,
paddr, 0, 0);
omap_set_dma_color_mode(lch, OMAP_DMA_CONSTANT_FILL, 0x000000);
omap_start_dma(lch);
if (wait_for_completion_timeout(&compl, msecs_to_jiffies(1000)) == 0) {
omap_stop_dma(lch);
pr_err("VRAM: dma timeout while clearing memory\n");
r = -EIO;
goto err;
}
r = 0;
err:
omap_free_dma(lch);
return r;
}
static int _omap_vram_alloc(int mtype, unsigned pages, unsigned long *paddr)
{
struct vram_region *rm;
struct vram_alloc *alloc;
list_for_each_entry(rm, &region_list, list) {
unsigned long start, end;
DBG("checking region %lx %d\n", rm->paddr, rm->pages);
if (region_mem_type(rm->paddr) != mtype)
continue;
start = rm->paddr;
list_for_each_entry(alloc, &rm->alloc_list, list) {
end = alloc->paddr;
if (end - start >= pages << PAGE_SHIFT)
goto found;
start = alloc->paddr + (alloc->pages << PAGE_SHIFT);
}
end = rm->paddr + (rm->pages << PAGE_SHIFT);
found:
if (end - start < pages << PAGE_SHIFT)
continue;
DBG("found %lx, end %lx\n", start, end);
alloc = omap_vram_create_allocation(rm, start, pages);
if (alloc == NULL)
return -ENOMEM;
*paddr = start;
_omap_vram_clear(start, pages);
return 0;
}
return -ENOMEM;
}
int omap_vram_alloc(int mtype, size_t size, unsigned long *paddr)
{
unsigned pages;
int r;
BUG_ON(mtype > OMAP_VRAM_MEMTYPE_MAX || !size);
DBG("alloc mem type %d size %d\n", mtype, size);
size = PAGE_ALIGN(size);
pages = size >> PAGE_SHIFT;
mutex_lock(&region_mutex);
r = _omap_vram_alloc(mtype, pages, paddr);
mutex_unlock(&region_mutex);
return r;
}
EXPORT_SYMBOL(omap_vram_alloc);
void omap_vram_get_info(unsigned long *vram,
unsigned long *free_vram,
unsigned long *largest_free_block)
{
struct vram_region *vr;
struct vram_alloc *va;
*vram = 0;
*free_vram = 0;
*largest_free_block = 0;
mutex_lock(&region_mutex);
list_for_each_entry(vr, &region_list, list) {
unsigned free;
unsigned long pa;
pa = vr->paddr;
*vram += vr->pages << PAGE_SHIFT;
list_for_each_entry(va, &vr->alloc_list, list) {
free = va->paddr - pa;
*free_vram += free;
if (free > *largest_free_block)
*largest_free_block = free;
pa = va->paddr + (va->pages << PAGE_SHIFT);
}
free = vr->paddr + (vr->pages << PAGE_SHIFT) - pa;
*free_vram += free;
if (free > *largest_free_block)
*largest_free_block = free;
}
mutex_unlock(&region_mutex);
}
EXPORT_SYMBOL(omap_vram_get_info);
#if defined(CONFIG_DEBUG_FS)
static int vram_debug_show(struct seq_file *s, void *unused)
{
struct vram_region *vr;
struct vram_alloc *va;
unsigned size;
mutex_lock(&region_mutex);
list_for_each_entry(vr, &region_list, list) {
size = vr->pages << PAGE_SHIFT;
seq_printf(s, "%08lx-%08lx (%d bytes)\n",
vr->paddr, vr->paddr + size - 1,
size);
list_for_each_entry(va, &vr->alloc_list, list) {
size = va->pages << PAGE_SHIFT;
seq_printf(s, " %08lx-%08lx (%d bytes)\n",
va->paddr, va->paddr + size - 1,
size);
}
}
mutex_unlock(&region_mutex);
return 0;
}
static int vram_debug_open(struct inode *inode, struct file *file)
{
return single_open(file, vram_debug_show, inode->i_private);
}
static const struct file_operations vram_debug_fops = {
.open = vram_debug_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int __init omap_vram_create_debugfs(void)
{
struct dentry *d;
d = debugfs_create_file("vram", S_IRUGO, NULL,
NULL, &vram_debug_fops);
if (IS_ERR(d))
return PTR_ERR(d);
return 0;
}
#endif
static __init int omap_vram_init(void)
{
int i;
vram_initialized = 1;
for (i = 0; i < postponed_cnt; i++)
omap_vram_add_region(postponed_regions[i].paddr,
postponed_regions[i].size);
#ifdef CONFIG_DEBUG_FS
if (omap_vram_create_debugfs())
pr_err("VRAM: Failed to create debugfs file\n");
#endif
return 0;
}
arch_initcall(omap_vram_init);
/* boottime vram alloc stuff */
/* set from board file */
static u32 omap_vram_sram_start __initdata;
static u32 omap_vram_sram_size __initdata;
/* set from board file */
static u32 omap_vram_sdram_start __initdata;
static u32 omap_vram_sdram_size __initdata;
/* set from kernel cmdline */
static u32 omap_vram_def_sdram_size __initdata;
static u32 omap_vram_def_sdram_start __initdata;
static int __init omap_vram_early_vram(char *p)
{
omap_vram_def_sdram_size = memparse(p, &p);
if (*p == ',')
omap_vram_def_sdram_start = simple_strtoul(p + 1, &p, 16);
return 0;
}
early_param("vram", omap_vram_early_vram);
/*
* Called from map_io. We need to call to this early enough so that we
* can reserve the fixed SDRAM regions before VM could get hold of them.
*/
void __init omap_vram_reserve_sdram_memblock(void)
{
u32 paddr;
u32 size = 0;
/* cmdline arg overrides the board file definition */
if (omap_vram_def_sdram_size) {
size = omap_vram_def_sdram_size;
paddr = omap_vram_def_sdram_start;
}
if (!size) {
size = omap_vram_sdram_size;
paddr = omap_vram_sdram_start;
}
#ifdef CONFIG_OMAP2_VRAM_SIZE
if (!size) {
size = CONFIG_OMAP2_VRAM_SIZE * 1024 * 1024;
paddr = 0;
}
#endif
if (!size)
return;
size = ALIGN(size, SZ_2M);
if (paddr) {
if (paddr & ~PAGE_MASK) {
pr_err("VRAM start address 0x%08x not page aligned\n",
paddr);
return;
}
if (!memblock_is_region_memory(paddr, size)) {
pr_err("Illegal SDRAM region 0x%08x..0x%08x for VRAM\n",
paddr, paddr + size - 1);
return;
}
if (memblock_is_region_reserved(paddr, size)) {
pr_err("FB: failed to reserve VRAM - busy\n");
return;
}
if (memblock_reserve(paddr, size) < 0) {
pr_err("FB: failed to reserve VRAM - no memory\n");
return;
}
} else {
paddr = memblock_alloc(size, SZ_2M);
}
memblock_free(paddr, size);
memblock_remove(paddr, size);
omap_vram_add_region(paddr, size);
pr_info("Reserving %u bytes SDRAM for VRAM\n", size);
}
/*
* Called at sram init time, before anything is pushed to the SRAM stack.
* Because of the stack scheme, we will allocate everything from the
* start of the lowest address region to the end of SRAM. This will also
* include padding for page alignment and possible holes between regions.
*
* As opposed to the SDRAM case, we'll also do any dynamic allocations at
* this point, since the driver built as a module would have problem with
* freeing / reallocating the regions.
*/
unsigned long __init omap_vram_reserve_sram(unsigned long sram_pstart,
unsigned long sram_vstart,
unsigned long sram_size,
unsigned long pstart_avail,
unsigned long size_avail)
{
unsigned long pend_avail;
unsigned long reserved;
u32 paddr;
u32 size;
paddr = omap_vram_sram_start;
size = omap_vram_sram_size;
if (!size)
return 0;
reserved = 0;
pend_avail = pstart_avail + size_avail;
if (!paddr) {
/* Dynamic allocation */
if ((size_avail & PAGE_MASK) < size) {
pr_err("Not enough SRAM for VRAM\n");
return 0;
}
size_avail = (size_avail - size) & PAGE_MASK;
paddr = pstart_avail + size_avail;
}
if (paddr < sram_pstart ||
paddr + size > sram_pstart + sram_size) {
pr_err("Illegal SRAM region for VRAM\n");
return 0;
}
/* Reserve everything above the start of the region. */
if (pend_avail - paddr > reserved)
reserved = pend_avail - paddr;
size_avail = pend_avail - reserved - pstart_avail;
omap_vram_add_region(paddr, size);
if (reserved)
pr_info("Reserving %lu bytes SRAM for VRAM\n", reserved);
return reserved;
}
void __init omap_vram_set_sdram_vram(u32 size, u32 start)
{
omap_vram_sdram_start = start;
omap_vram_sdram_size = size;
}
void __init omap_vram_set_sram_vram(u32 size, u32 start)
{
omap_vram_sram_start = start;
omap_vram_sram_size = size;
}