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Message-id: <Pine.LNX.4.64.0701280041250.5046@montezuma.fsmlabs.com>
Date: Mon, 29 Jan 2007 21:20:31 -0800 (PST)
From: Zwane Mwaikambo <zwane@...radead.org>
To: Christoph Hellwig <hch@...radead.org>
Cc: Dave Jones <davej@...hat.com>, Andrew Morton <akpm@...l.org>,
Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] AGPGART compat ioctl
Hi Christoph,
Thanks for the input. The following has your recommendations;
drivers/char/agp/Makefile | 1
drivers/char/agp/agp.h | 2
drivers/char/agp/compat_ioctl.c | 282 ++++++++++++++++++++++++++++++++++++++++
drivers/char/agp/compat_ioctl.h | 105 ++++++++++++++
drivers/char/agp/frontend.c | 31 ++--
5 files changed, 407 insertions(+), 14 deletions(-)
Index: linux-2.6.20-rc4-mm1/drivers/char/agp/Makefile
===================================================================
RCS file: /home/cvsroot/linux-2.6.20-rc4-mm1/drivers/char/agp/Makefile,v
retrieving revision 1.1.1.1
diff -u -p -B -r1.1.1.1 Makefile
--- linux-2.6.20-rc4-mm1/drivers/char/agp/Makefile 27 Jan 2007 22:03:38 -0000 1.1.1.1
+++ linux-2.6.20-rc4-mm1/drivers/char/agp/Makefile 30 Jan 2007 04:42:21 -0000
@@ -1,6 +1,7 @@
agpgart-y := backend.o frontend.o generic.o isoch.o
obj-$(CONFIG_AGP) += agpgart.o
+obj-$(CONFIG_COMPAT) += compat_ioctl.o
obj-$(CONFIG_AGP_ALI) += ali-agp.o
obj-$(CONFIG_AGP_ATI) += ati-agp.o
obj-$(CONFIG_AGP_AMD) += amd-k7-agp.o
Index: linux-2.6.20-rc4-mm1/drivers/char/agp/agp.h
===================================================================
RCS file: /home/cvsroot/linux-2.6.20-rc4-mm1/drivers/char/agp/agp.h,v
retrieving revision 1.1.1.1
diff -u -p -B -r1.1.1.1 agp.h
--- linux-2.6.20-rc4-mm1/drivers/char/agp/agp.h 27 Jan 2007 22:03:38 -0000 1.1.1.1
+++ linux-2.6.20-rc4-mm1/drivers/char/agp/agp.h 30 Jan 2007 04:05:33 -0000
@@ -298,6 +298,8 @@ extern struct aper_size_info_16 agp3_gen
extern int agp_off;
extern int agp_try_unsupported_boot;
+long compat_agp_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
+
/* Chipset independant registers (from AGP Spec) */
#define AGP_APBASE 0x10
Index: linux-2.6.20-rc4-mm1/drivers/char/agp/compat_ioctl.c
===================================================================
RCS file: linux-2.6.20-rc4-mm1/drivers/char/agp/compat_ioctl.c
diff -N linux-2.6.20-rc4-mm1/drivers/char/agp/compat_ioctl.c
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ linux-2.6.20-rc4-mm1/drivers/char/agp/compat_ioctl.c 30 Jan 2007 05:15:44 -0000
@@ -0,0 +1,282 @@
+/*
+ * AGPGART driver frontend compatibility ioctls
+ * Copyright (C) 2004 Silicon Graphics, Inc.
+ * Copyright (C) 2002-2003 Dave Jones
+ * Copyright (C) 1999 Jeff Hartmann
+ * Copyright (C) 1999 Precision Insight, Inc.
+ * Copyright (C) 1999 Xi Graphics, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * JEFF HARTMANN, OR ANY OTHER CONTRIBUTORS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
+ * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/agpgart.h>
+#include <asm/uaccess.h>
+#include "agp.h"
+#include "compat_ioctl.h"
+
+static int compat_agpioc_info_wrap(struct agp_file_private *priv, void __user *arg)
+{
+ struct agp_info32 userinfo;
+ struct agp_kern_info kerninfo;
+
+ agp_copy_info(agp_bridge, &kerninfo);
+
+ userinfo.version.major = kerninfo.version.major;
+ userinfo.version.minor = kerninfo.version.minor;
+ userinfo.bridge_id = kerninfo.device->vendor |
+ (kerninfo.device->device << 16);
+ userinfo.agp_mode = kerninfo.mode;
+ userinfo.aper_base = (compat_long_t)kerninfo.aper_base;
+ userinfo.aper_size = kerninfo.aper_size;
+ userinfo.pg_total = userinfo.pg_system = kerninfo.max_memory;
+ userinfo.pg_used = kerninfo.current_memory;
+
+ if (copy_to_user(arg, &userinfo, sizeof(userinfo)))
+ return -EFAULT;
+
+ return 0;
+}
+
+static int compat_agpioc_reserve_wrap(struct agp_file_private *priv, void __user *arg)
+{
+ struct agp_region32 ureserve;
+ struct agp_region kreserve;
+ struct agp_client *client;
+ struct agp_file_private *client_priv;
+
+ DBG("");
+ if (copy_from_user(&ureserve, arg, sizeof(ureserve)))
+ return -EFAULT;
+
+ if ((unsigned) ureserve.seg_count >= ~0U/sizeof(struct agp_segment32))
+ return -EFAULT;
+
+ kreserve.pid = ureserve.pid;
+ kreserve.seg_count = ureserve.seg_count;
+
+ client = agp_find_client_by_pid(kreserve.pid);
+
+ if (kreserve.seg_count == 0) {
+ /* remove a client */
+ client_priv = agp_find_private(kreserve.pid);
+
+ if (client_priv != NULL) {
+ set_bit(AGP_FF_IS_CLIENT, &client_priv->access_flags);
+ set_bit(AGP_FF_IS_VALID, &client_priv->access_flags);
+ }
+ if (client == NULL) {
+ /* client is already removed */
+ return 0;
+ }
+ return agp_remove_client(kreserve.pid);
+ } else {
+ struct agp_segment32 *usegment;
+ struct agp_segment *ksegment;
+ int seg;
+
+ if (ureserve.seg_count >= 16384)
+ return -EINVAL;
+
+ usegment = kmalloc(sizeof(*usegment) * ureserve.seg_count, GFP_KERNEL);
+ if (!usegment)
+ return -ENOMEM;
+
+ ksegment = kmalloc(sizeof(*ksegment) * kreserve.seg_count, GFP_KERNEL);
+ if (!ksegment) {
+ kfree(usegment);
+ return -ENOMEM;
+ }
+
+ if (copy_from_user(usegment, (void __user *) ureserve.seg_list,
+ sizeof(*usegment) * ureserve.seg_count)) {
+ kfree(usegment);
+ kfree(ksegment);
+ return -EFAULT;
+ }
+
+ for (seg = 0; seg < ureserve.seg_count; seg++) {
+ ksegment[seg].pg_start = usegment[seg].pg_start;
+ ksegment[seg].pg_count = usegment[seg].pg_count;
+ ksegment[seg].prot = usegment[seg].prot;
+ }
+
+ kfree(usegment);
+ kreserve.seg_list = ksegment;
+
+ if (client == NULL) {
+ /* Create the client and add the segment */
+ client = agp_create_client(kreserve.pid);
+
+ if (client == NULL) {
+ kfree(ksegment);
+ return -ENOMEM;
+ }
+ client_priv = agp_find_private(kreserve.pid);
+
+ if (client_priv != NULL) {
+ set_bit(AGP_FF_IS_CLIENT, &client_priv->access_flags);
+ set_bit(AGP_FF_IS_VALID, &client_priv->access_flags);
+ }
+ }
+ return agp_create_segment(client, &kreserve);
+ }
+ /* Will never really happen */
+ return -EINVAL;
+}
+
+static int compat_agpioc_allocate_wrap(struct agp_file_private *priv, void __user *arg)
+{
+ struct agp_memory *memory;
+ struct agp_allocate32 alloc;
+
+ DBG("");
+ if (copy_from_user(&alloc, arg, sizeof(alloc)))
+ return -EFAULT;
+
+ memory = agp_allocate_memory_wrap(alloc.pg_count, alloc.type);
+
+ if (memory == NULL)
+ return -ENOMEM;
+
+ alloc.key = memory->key;
+ alloc.physical = memory->physical;
+
+ if (copy_to_user(arg, &alloc, sizeof(alloc))) {
+ agp_free_memory_wrap(memory);
+ return -EFAULT;
+ }
+ return 0;
+}
+
+static int compat_agpioc_bind_wrap(struct agp_file_private *priv, void __user *arg)
+{
+ struct agp_bind32 bind_info;
+ struct agp_memory *memory;
+
+ DBG("");
+ if (copy_from_user(&bind_info, arg, sizeof(bind_info)))
+ return -EFAULT;
+
+ memory = agp_find_mem_by_key(bind_info.key);
+
+ if (memory == NULL)
+ return -EINVAL;
+
+ return agp_bind_memory(memory, bind_info.pg_start);
+}
+
+static int compat_agpioc_unbind_wrap(struct agp_file_private *priv, void __user *arg)
+{
+ struct agp_memory *memory;
+ struct agp_unbind32 unbind;
+
+ DBG("");
+ if (copy_from_user(&unbind, arg, sizeof(unbind)))
+ return -EFAULT;
+
+ memory = agp_find_mem_by_key(unbind.key);
+
+ if (memory == NULL)
+ return -EINVAL;
+
+ return agp_unbind_memory(memory);
+}
+
+long compat_agp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ struct agp_file_private *curr_priv = file->private_data;
+ int ret_val = -ENOTTY;
+
+ mutex_lock(&(agp_fe.agp_mutex));
+
+ if ((agp_fe.current_controller == NULL) &&
+ (cmd != AGPIOC_ACQUIRE32)) {
+ ret_val = -EINVAL;
+ goto ioctl_out;
+ }
+ if ((agp_fe.backend_acquired != TRUE) &&
+ (cmd != AGPIOC_ACQUIRE32)) {
+ ret_val = -EBUSY;
+ goto ioctl_out;
+ }
+ if (cmd != AGPIOC_ACQUIRE32) {
+ if (!(test_bit(AGP_FF_IS_CONTROLLER, &curr_priv->access_flags))) {
+ ret_val = -EPERM;
+ goto ioctl_out;
+ }
+ /* Use the original pid of the controller,
+ * in case it's threaded */
+
+ if (agp_fe.current_controller->pid != curr_priv->my_pid) {
+ ret_val = -EBUSY;
+ goto ioctl_out;
+ }
+ }
+
+ switch (cmd) {
+ case AGPIOC_INFO32:
+ ret_val = compat_agpioc_info_wrap(curr_priv, (void __user *) arg);
+ break;
+
+ case AGPIOC_ACQUIRE32:
+ ret_val = agpioc_acquire_wrap(curr_priv);
+ break;
+
+ case AGPIOC_RELEASE32:
+ ret_val = agpioc_release_wrap(curr_priv);
+ break;
+
+ case AGPIOC_SETUP32:
+ ret_val = agpioc_setup_wrap(curr_priv, (void __user *) arg);
+ break;
+
+ case AGPIOC_RESERVE32:
+ ret_val = compat_agpioc_reserve_wrap(curr_priv, (void __user *) arg);
+ break;
+
+ case AGPIOC_PROTECT32:
+ ret_val = agpioc_protect_wrap(curr_priv);
+ break;
+
+ case AGPIOC_ALLOCATE32:
+ ret_val = compat_agpioc_allocate_wrap(curr_priv, (void __user *) arg);
+ break;
+
+ case AGPIOC_DEALLOCATE32:
+ ret_val = agpioc_deallocate_wrap(curr_priv, (int) arg);
+ break;
+
+ case AGPIOC_BIND32:
+ ret_val = compat_agpioc_bind_wrap(curr_priv, (void __user *) arg);
+ break;
+
+ case AGPIOC_UNBIND32:
+ ret_val = compat_agpioc_unbind_wrap(curr_priv, (void __user *) arg);
+ break;
+ }
+
+ioctl_out:
+ DBG("ioctl returns %d\n", ret_val);
+ mutex_unlock(&(agp_fe.agp_mutex));
+ return ret_val;
+}
+
Index: linux-2.6.20-rc4-mm1/drivers/char/agp/compat_ioctl.h
===================================================================
RCS file: linux-2.6.20-rc4-mm1/drivers/char/agp/compat_ioctl.h
diff -N linux-2.6.20-rc4-mm1/drivers/char/agp/compat_ioctl.h
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ linux-2.6.20-rc4-mm1/drivers/char/agp/compat_ioctl.h 30 Jan 2007 04:34:51 -0000
@@ -0,0 +1,105 @@
+/*
+ * Copyright (C) 1999 Jeff Hartmann
+ * Copyright (C) 1999 Precision Insight, Inc.
+ * Copyright (C) 1999 Xi Graphics, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * JEFF HARTMANN, OR ANY OTHER CONTRIBUTORS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
+ * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+#ifndef _AGP_COMPAT_IOCTL_H
+#define _AGP_COMPAT_IOCTL_H
+
+#include <linux/compat.h>
+#include <linux/agpgart.h>
+
+#define AGPIOC_INFO32 _IOR (AGPIOC_BASE, 0, compat_uptr_t)
+#define AGPIOC_ACQUIRE32 _IO (AGPIOC_BASE, 1)
+#define AGPIOC_RELEASE32 _IO (AGPIOC_BASE, 2)
+#define AGPIOC_SETUP32 _IOW (AGPIOC_BASE, 3, compat_uptr_t)
+#define AGPIOC_RESERVE32 _IOW (AGPIOC_BASE, 4, compat_uptr_t)
+#define AGPIOC_PROTECT32 _IOW (AGPIOC_BASE, 5, compat_uptr_t)
+#define AGPIOC_ALLOCATE32 _IOWR(AGPIOC_BASE, 6, compat_uptr_t)
+#define AGPIOC_DEALLOCATE32 _IOW (AGPIOC_BASE, 7, compat_int_t)
+#define AGPIOC_BIND32 _IOW (AGPIOC_BASE, 8, compat_uptr_t)
+#define AGPIOC_UNBIND32 _IOW (AGPIOC_BASE, 9, compat_uptr_t)
+
+struct agp_info32 {
+ struct agp_version version; /* version of the driver */
+ u32 bridge_id; /* bridge vendor/device */
+ u32 agp_mode; /* mode info of bridge */
+ compat_long_t aper_base; /* base of aperture */
+ compat_size_t aper_size; /* size of aperture */
+ compat_size_t pg_total; /* max pages (swap + system) */
+ compat_size_t pg_system; /* max pages (system) */
+ compat_size_t pg_used; /* current pages used */
+};
+
+/*
+ * The "prot" down below needs still a "sleep" flag somehow ...
+ */
+struct agp_segment32 {
+ compat_off_t pg_start; /* starting page to populate */
+ compat_size_t pg_count; /* number of pages */
+ compat_int_t prot; /* prot flags for mmap */
+};
+
+struct agp_region32 {
+ compat_pid_t pid; /* pid of process */
+ compat_size_t seg_count; /* number of segments */
+ struct agp_segment32 *seg_list;
+};
+
+struct agp_allocate32 {
+ compat_int_t key; /* tag of allocation */
+ compat_size_t pg_count; /* number of pages */
+ u32 type; /* 0 == normal, other devspec */
+ u32 physical; /* device specific (some devices
+ * need a phys address of the
+ * actual page behind the gatt
+ * table) */
+};
+
+struct agp_bind32 {
+ compat_int_t key; /* tag of allocation */
+ compat_off_t pg_start; /* starting page to populate */
+};
+
+struct agp_unbind32 {
+ compat_int_t key; /* tag of allocation */
+ u32 priority; /* priority for paging out */
+};
+
+extern struct agp_front_data agp_fe;
+
+int agpioc_acquire_wrap(struct agp_file_private *priv);
+int agpioc_release_wrap(struct agp_file_private *priv);
+int agpioc_protect_wrap(struct agp_file_private *priv);
+int agpioc_setup_wrap(struct agp_file_private *priv, void __user *arg);
+int agpioc_deallocate_wrap(struct agp_file_private *priv, int arg);
+struct agp_file_private *agp_find_private(pid_t pid);
+struct agp_client *agp_create_client(pid_t id);
+int agp_remove_client(pid_t id);
+int agp_create_segment(struct agp_client *client, struct agp_region *region);
+void agp_free_memory_wrap(struct agp_memory *memory);
+struct agp_memory *agp_allocate_memory_wrap(size_t pg_count, u32 type);
+struct agp_memory *agp_find_mem_by_key(int key);
+struct agp_client *agp_find_client_by_pid(pid_t id);
+
+#endif /* _AGP_COMPAT_H */
Index: linux-2.6.20-rc4-mm1/drivers/char/agp/frontend.c
===================================================================
RCS file: /home/cvsroot/linux-2.6.20-rc4-mm1/drivers/char/agp/frontend.c,v
retrieving revision 1.1.1.1
diff -u -p -B -r1.1.1.1 frontend.c
--- linux-2.6.20-rc4-mm1/drivers/char/agp/frontend.c 27 Jan 2007 22:03:38 -0000 1.1.1.1
+++ linux-2.6.20-rc4-mm1/drivers/char/agp/frontend.c 30 Jan 2007 04:44:23 -0000
@@ -41,9 +41,9 @@
#include <asm/pgtable.h>
#include "agp.h"
-static struct agp_front_data agp_fe;
+struct agp_front_data agp_fe;
-static struct agp_memory *agp_find_mem_by_key(int key)
+struct agp_memory *agp_find_mem_by_key(int key)
{
struct agp_memory *curr;
@@ -159,7 +159,7 @@ static pgprot_t agp_convert_mmap_flags(i
return vm_get_page_prot(prot_bits);
}
-static int agp_create_segment(struct agp_client *client, struct agp_region *region)
+int agp_create_segment(struct agp_client *client, struct agp_region *region)
{
struct agp_segment_priv **ret_seg;
struct agp_segment_priv *seg;
@@ -211,7 +211,7 @@ static void agp_insert_into_pool(struct
/* File private list routines */
-static struct agp_file_private *agp_find_private(pid_t pid)
+struct agp_file_private *agp_find_private(pid_t pid)
{
struct agp_file_private *curr;
@@ -266,13 +266,13 @@ static void agp_remove_file_private(stru
* Wrappers for agp_free_memory & agp_allocate_memory
* These make sure that internal lists are kept updated.
*/
-static void agp_free_memory_wrap(struct agp_memory *memory)
+void agp_free_memory_wrap(struct agp_memory *memory)
{
agp_remove_from_pool(memory);
agp_free_memory(memory);
}
-static struct agp_memory *agp_allocate_memory_wrap(size_t pg_count, u32 type)
+struct agp_memory *agp_allocate_memory_wrap(size_t pg_count, u32 type)
{
struct agp_memory *memory;
@@ -484,7 +484,7 @@ static struct agp_controller *agp_find_c
return NULL;
}
-static struct agp_client *agp_find_client_by_pid(pid_t id)
+struct agp_client *agp_find_client_by_pid(pid_t id)
{
struct agp_client *temp;
@@ -509,7 +509,7 @@ static void agp_insert_client(struct agp
agp_fe.current_controller->num_clients++;
}
-static struct agp_client *agp_create_client(pid_t id)
+struct agp_client *agp_create_client(pid_t id)
{
struct agp_client *new_client;
@@ -522,7 +522,7 @@ static struct agp_client *agp_create_cli
return new_client;
}
-static int agp_remove_client(pid_t id)
+int agp_remove_client(pid_t id)
{
struct agp_client *client;
struct agp_client *prev_client;
@@ -746,7 +746,7 @@ static int agpioc_info_wrap(struct agp_f
return 0;
}
-static int agpioc_acquire_wrap(struct agp_file_private *priv)
+int agpioc_acquire_wrap(struct agp_file_private *priv)
{
struct agp_controller *controller;
@@ -789,14 +789,14 @@ static int agpioc_acquire_wrap(struct ag
return 0;
}
-static int agpioc_release_wrap(struct agp_file_private *priv)
+int agpioc_release_wrap(struct agp_file_private *priv)
{
DBG("");
agp_controller_release_current(agp_fe.current_controller, priv);
return 0;
}
-static int agpioc_setup_wrap(struct agp_file_private *priv, void __user *arg)
+int agpioc_setup_wrap(struct agp_file_private *priv, void __user *arg)
{
struct agp_setup mode;
@@ -876,7 +876,7 @@ static int agpioc_reserve_wrap(struct ag
return -EINVAL;
}
-static int agpioc_protect_wrap(struct agp_file_private *priv)
+int agpioc_protect_wrap(struct agp_file_private *priv)
{
DBG("");
/* This function is not currently implemented */
@@ -910,7 +910,7 @@ static int agpioc_allocate_wrap(struct a
return 0;
}
-static int agpioc_deallocate_wrap(struct agp_file_private *priv, int arg)
+int agpioc_deallocate_wrap(struct agp_file_private *priv, int arg)
{
struct agp_memory *memory;
@@ -1046,6 +1046,9 @@ static const struct file_operations agp_
.read = agp_read,
.write = agp_write,
.ioctl = agp_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = compat_agp_ioctl,
+#endif
.mmap = agp_mmap,
.open = agp_open,
.release = agp_release,
-
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