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Subject[PATCH] CONFIG_GENERIC_ISA_DMA
Linus, lkml,

The following patch adds support for CONFIG_GENERIC_ISA_DMA, which went
into the 2.4-ac kernel series prior to 2.5 happening.

The following patch allows architectures to decide whether they want
the generic ISA DMA functionality provided by kernel/dma.c and other
supporting files.

In addition, we move the procfs "/proc/dma" support code out of fs/proc
into kernel/dma.c, and adapt it to use the new seq_file code.

This patch is against 2.5.21.

--- orig/arch/alpha/config.in Wed May 29 23:56:58 2002
+++ linux/arch/alpha/config.in Wed May 29 21:55:08 2002
@@ -7,6 +7,7 @@
define_bool CONFIG_UID16 n
define_bool CONFIG_RWSEM_GENERIC_SPINLOCK n
define_bool CONFIG_RWSEM_XCHGADD_ALGORITHM y
+define_bool CONFIG_GENERIC_ISA_DMA y

source init/Config.in

--- orig/arch/i386/config.in Wed Jun 5 10:08:22 2002
+++ linux/arch/i386/config.in Sat May 25 10:25:43 2002
@@ -9,6 +9,7 @@
define_bool CONFIG_SBUS n

define_bool CONFIG_UID16 y
+define_bool CONFIG_GENERIC_ISA_DMA y

source init/Config.in

--- orig/arch/m68k/config.in Sat May 25 11:09:21 2002
+++ linux/arch/m68k/config.in Mon May 13 10:16:01 2002
@@ -6,6 +6,7 @@
define_bool CONFIG_UID16 y
define_bool CONFIG_RWSEM_GENERIC_SPINLOCK y
define_bool CONFIG_RWSEM_XCHGADD_ALGORITHM n
+define_bool CONFIG_GENERIC_ISA_DMA y

mainmenu_name "Linux/68k Kernel Configuration"

--- orig/arch/mips/config.in Sat May 25 11:09:28 2002
+++ linux/arch/mips/config.in Wed Apr 24 19:32:40 2002
@@ -4,6 +4,7 @@
#
define_bool CONFIG_MIPS y
define_bool CONFIG_SMP n
+define_bool CONFIG_GENERIC_ISA_DMA y

mainmenu_name "Linux Kernel Configuration"

--- orig/arch/mips64/config.in Sat May 25 11:09:34 2002
+++ linux/arch/mips64/config.in Wed Apr 24 19:32:40 2002
@@ -26,6 +26,7 @@

define_bool CONFIG_RWSEM_GENERIC_SPINLOCK y
define_bool CONFIG_RWSEM_XCHGADD_ALGORITHM n
+define_bool CONFIG_GENERIC_ISA_DMA y

#
# Select some configuration options automatically based on user selections
--- orig/arch/parisc/config.in Sat May 25 11:09:39 2002
+++ linux/arch/parisc/config.in Sun Feb 24 16:46:01 2002
@@ -9,6 +9,7 @@
define_bool CONFIG_UID16 n
define_bool CONFIG_RWSEM_GENERIC_SPINLOCK y
define_bool CONFIG_RWSEM_XCHGADD_ALGORITHM n
+define_bool CONFIG_GENERIC_ISA_DMA y

source init/Config.in

--- orig/arch/ppc/config.in Wed May 29 23:57:00 2002
+++ linux/arch/ppc/config.in Wed May 29 21:55:14 2002
@@ -7,6 +7,7 @@
define_bool CONFIG_RWSEM_GENERIC_SPINLOCK n
define_bool CONFIG_RWSEM_XCHGADD_ALGORITHM y
define_bool CONFIG_HAVE_DEC_LOCK y
+define_bool CONFIG_GENERIC_ISA_DMA y

mainmenu_name "Linux/PowerPC Kernel Configuration"

--- orig/arch/sh/config.in Sat May 25 11:09:56 2002
+++ linux/arch/sh/config.in Sat Mar 23 23:09:17 2002
@@ -9,6 +9,7 @@
define_bool CONFIG_UID16 y
define_bool CONFIG_RWSEM_GENERIC_SPINLOCK y
define_bool CONFIG_RWSEM_XCHGADD_ALGORITHM n
+define_bool CONFIG_GENERIC_ISA_DMA y

source init/Config.in

--- orig/arch/sparc/config.in Sat May 25 11:09:59 2002
+++ linux/arch/sparc/config.in Fri May 3 10:39:16 2002
@@ -6,6 +6,7 @@

define_bool CONFIG_UID16 y
define_bool CONFIG_HIGHMEM y
+define_bool CONFIG_GENERIC_ISA_DMA y

source init/Config.in

--- orig/arch/sparc64/config.in Sat May 25 11:10:04 2002
+++ linux/arch/sparc64/config.in Mon May 6 16:42:10 2002
@@ -26,6 +26,7 @@
define_bool CONFIG_HAVE_DEC_LOCK y
define_bool CONFIG_RWSEM_GENERIC_SPINLOCK n
define_bool CONFIG_RWSEM_XCHGADD_ALGORITHM y
+define_bool CONFIG_GENERIC_ISA_DMA y
define_bool CONFIG_ISA n
define_bool CONFIG_ISAPNP n
define_bool CONFIG_EISA n
--- linux-tolinus/kernel/Makefile Wed Jun 5 10:08:25 2002
+++ linux/kernel/Makefile Wed Jun 5 18:38:14 2002
@@ -10,13 +10,14 @@
O_TARGET := kernel.o

export-objs = signal.o sys.o kmod.o context.o ksyms.o pm.o exec_domain.o \
- printk.o platform.o suspend.o
+ printk.o platform.o suspend.o dma.o

-obj-y = sched.o dma.o fork.o exec_domain.o panic.o printk.o \
+obj-y = sched.o fork.o exec_domain.o panic.o printk.o \
module.o exit.o itimer.o time.o softirq.o resource.o \
sysctl.o capability.o ptrace.o timer.o user.o \
signal.o sys.o kmod.o context.o futex.o platform.o

+obj-$(CONFIG_GENERIC_ISA_DMA) += dma.o
obj-$(CONFIG_UID16) += uid16.o
obj-$(CONFIG_MODULES) += ksyms.o
obj-$(CONFIG_PM) += pm.o
--- linux-tolinus/kernel/dma.c Sat May 25 11:13:57 2002
+++ linux/kernel/dma.c Wed Jun 5 19:26:12 2002
@@ -9,11 +9,14 @@
* [It also happened to remove the sizeof(char *) == sizeof(int)
* assumption introduced because of those /proc/dma patches. -- Hennus]
*/
-
+#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/spinlock.h>
#include <linux/string.h>
+#include <linux/seq_file.h>
+#include <linux/proc_fs.h>
+#include <linux/init.h>
#include <asm/dma.h>
#include <asm/system.h>

@@ -65,20 +68,6 @@
{ 0, 0 }
};

-int get_dma_list(char *buf)
-{
- int i, len = 0;
-
- for (i = 0 ; i < MAX_DMA_CHANNELS ; i++) {
- if (dma_chan_busy[i].lock) {
- len += sprintf(buf+len, "%2d: %s\n",
- i,
- dma_chan_busy[i].device_id);
- }
- }
- return len;
-} /* get_dma_list */
-

int request_dma(unsigned int dmanr, const char * device_id)
{
@@ -109,6 +98,19 @@

} /* free_dma */

+static int proc_dma_show(struct seq_file *m, void *v)
+{
+ int i;
+
+ for (i = 0 ; i < MAX_DMA_CHANNELS ; i++) {
+ if (dma_chan_busy[i].lock) {
+ seq_printf(m, "%2d: %s\n", i,
+ dma_chan_busy[i].device_id);
+ }
+ }
+ return 0;
+}
+
#else

int request_dma(unsigned int dmanr, const char *device_id)
@@ -120,9 +122,52 @@
{
}

-int get_dma_list(char *buf)
-{
- strcpy(buf, "No DMA\n");
- return 7;
+static int proc_dma_show(struct seq_file *m, void *v)
+{
+ seq_puts(m, "No DMA\n");
+ return 0;
}
+
#endif
+
+static int proc_dma_open(struct inode *inode, struct file *file)
+{
+ char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
+ struct seq_file *m;
+ int res;
+
+ if (!buf)
+ return -ENOMEM;
+ res = single_open(file, proc_dma_show, NULL);
+ if (!res) {
+ m = file->private_data;
+ m->buf = buf;
+ m->size = PAGE_SIZE;
+ } else
+ kfree(buf);
+ return res;
+}
+
+static struct file_operations proc_dma_operations = {
+ open: proc_dma_open,
+ read: seq_read,
+ llseek: seq_lseek,
+ release: single_release,
+};
+
+static int __init proc_dma_init(void)
+{
+ struct proc_dir_entry *e;
+
+ e = create_proc_entry("dma", 0, NULL);
+ if (e)
+ e->proc_fops = &proc_dma_operations;
+
+ return 0;
+}
+
+__initcall(proc_dma_init);
+
+EXPORT_SYMBOL(request_dma);
+EXPORT_SYMBOL(free_dma);
+EXPORT_SYMBOL(dma_spin_lock);
--- linux-tolinus/kernel/ksyms.c Wed Jun 5 10:08:25 2002
+++ linux/kernel/ksyms.c Wed Jun 5 18:48:44 2002
@@ -63,9 +63,6 @@
extern void *sys_call_table;

extern struct timezone sys_tz;
-extern int request_dma(unsigned int dmanr, const char * deviceID);
-extern void free_dma(unsigned int dmanr);
-extern spinlock_t dma_spin_lock;

#ifdef CONFIG_MODVERSIONS
const struct module_symbol __export_Using_Versions
@@ -434,10 +432,6 @@
EXPORT_SYMBOL(brw_kiovec);
EXPORT_SYMBOL(kiobuf_wait_for_io);

-/* dma handling */
-EXPORT_SYMBOL(request_dma);
-EXPORT_SYMBOL(free_dma);
-EXPORT_SYMBOL(dma_spin_lock);
#ifdef HAVE_DISABLE_HLT
EXPORT_SYMBOL(disable_hlt);
EXPORT_SYMBOL(enable_hlt);
--- linux-tolinus/fs/proc/proc_misc.c Wed May 29 23:57:09 2002
+++ linux/fs/proc/proc_misc.c Wed Jun 5 19:17:51 2002
@@ -394,13 +394,6 @@
return proc_calc_metrics(page, start, off, count, eof, len);
}

-static int dma_read_proc(char *page, char **start, off_t off,
- int count, int *eof, void *data)
-{
- int len = get_dma_list(page);
- return proc_calc_metrics(page, start, off, count, eof, len);
-}
-
static int ioports_read_proc(char *page, char **start, off_t off,
int count, int *eof, void *data)
{
@@ -553,7 +546,6 @@
{"stat", kstat_read_proc},
{"devices", devices_read_proc},
{"filesystems", filesystems_read_proc},
- {"dma", dma_read_proc},
{"ioports", ioports_read_proc},
{"cmdline", cmdline_read_proc},
#ifdef CONFIG_SGI_DS1286
--
Russell King (rmk@arm.linux.org.uk) The developer of ARM Linux
http://www.arm.linux.org.uk/personal/aboutme.html

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