Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262502AbVEMTkA (ORCPT ); Fri, 13 May 2005 15:40:00 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262498AbVEMTOr (ORCPT ); Fri, 13 May 2005 15:14:47 -0400 Received: from ausc60ps301.us.dell.com ([143.166.148.206]:14137 "EHLO ausc60ps301.us.dell.com") by vger.kernel.org with ESMTP id S262497AbVEMTDA (ORCPT ); Fri, 13 May 2005 15:03:00 -0400 X-IronPort-AV: i="3.93,107,1115010000"; d="scan'208"; a="243031252:sNHT44009612" Date: Fri, 13 May 2005 14:00:30 -0500 From: Abhay Salunke To: linux-kernel@vger.kernel.org, Andrew Morton Cc: abhay_salunke@dell.com, matt_domsch@dell.com Subject: [patch 2.6.12-rc3] dell_rbu: Resubmitting patch for new Dell BIOS update driver Message-ID: <20050513190030.GA2338@littleblue.us.dell.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.4.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 32329 Lines: 999 This is a resubmit of the patch after incorporating first round of suggestson from Andrew Morton. By making a contribution to this project, I certify that: The contribution was created in whole or in part by me and I have the right to submit it under the open source license indicated in the file. Signed-off-by: Abhay Salunke Thanks, Abhay Salunke Software Engineer. DELL Inc diff -uprN linux-2.6.11.8.ORIG/Documentation/DELL_RBU.txt linux-2.6.11.8/Documentation/DELL_RBU.txt --- linux-2.6.11.8.ORIG/Documentation/DELL_RBU.txt 1969-12-31 18:00:00.000000000 -0600 +++ linux-2.6.11.8/Documentation/DELL_RBU.txt 2005-05-11 13:22:45.712684696 -0500 @@ -0,0 +1,92 @@ +Purpose: +Demonstrate the usage of the DELL_RBU (DELL Remote BIOS Update) driver +for updating BIOS images on Dell hardware. + +Scope: +This document discusses the functionality of the DELL_RBU driver. +This driver is required by BIOS update applications shipped by DELL for updating +BIOS on DELL servers and client systems. + +Overview: +The rbu driver is designed to be running on 2.6 kernel. +This driver is one single dell_rbu.c file (approx 800 lines total). +The BIOS update is done by writing the new BIOS image in to contiguous physical +memory addressable by the BIOS. The user application indicates the BIOS regarding +the update of a fresh image. The BIOS then scans the memory to find the image and +it will then update itself. There are basically two different mechanisms for +writing the BIOS image in to contiguous memory +1> By writing the image to one single shunk of contiguous physical memory. +2> By writing image in to smaller chunks of contiguous physical memory. +The update mechanism is determined by the update application based on the +particular system type. + +Update mechanism using single physical chunk of memory: +The rbu driver on its load time created the following entries in sysfs +/sys/firmware/rbu/rbudatasize +/sys/firmware/rbu/rbudata + +Steps to update the BIOS image: + +1> Set the incoming BIOS image size in the /sys/firmware/rbudatasize file. + + e.g. echo XXXXXX > /sys/firmware/rbudatasize +NOTE: the size specified is always in decimal. + +you can also read back the image size by doing +cat /sys/firmware/rbudatasize + +2> Download the BIOS image by copying the image file to /sys/firmware/rbudata +file. +e.g. cat image.hdr > /sys/firmware/rbudata + +you can also read back the image using +cat /sys/firmware/rbu/rbudata +This is usually helpful in verifying the image downloaded. + +Step#1 results in the driver allocating contiguous physical memory of the size +echoed in to rbudatasize. The subsequent writes to rbudata as described in +step #2 results in the image getting written to the allocated contiguous physical +pages. Repeating step #2 will overwrite the previous data in rbudata file. + +On a driver unload the allocated memory is freed and the rbudatasize file reads 0. +The user should not unload the driver after downloading the new BIOS image for +if it wants to update BIOS with that image. + +The user can overwrite the rbudata file with a new image. The user has to make +sure that the new image size is less than or equal to the image size copied to +the rbudatasize file. +If the new image is grater than the allocated size then only the allocated size +gets copied the rest will not. + +The user can also free the previous BIOS image as follows +echo 0 > /sys/firmware/rbu/rbudatasize + +If the user tries to set the BIOS image size there is a possiblity that the +system may not have enough contiguous physical memory for upadtes, thus the +image allocation will fail. The user the needs to verify this by reading back +the rbudatasize which will be set to 0. + +Update using smaller chunks (packets) of contiguous memory: +The disadvantage of contiguous allocation is that it may not be always possible +to get that size of contiuguous chunk of avaliable physical pages as in most +Linux systems the memory gets fragmented immideately after a reboot. +The update using smaller chunks fixes this issue; it also requires the BIOS on +the system to support this feature; the update application needs to query this +with the BIOS on the system before using this technique. + +The appplication breaks the BIOS image in to small packets; before starting the +update using this technique, the application sets the packetdatasize as follows + +echo XXXXXX > /sys/firmware/packetdatasize +Any writes to /sys/firmware/packetdata results in allocation of contiguous +physical memory of packetdatasize and the data is written to that meomry. +Writing 0 to packetdatasize results in freeing of all packets. +Unloading the driver will also result in freeing up of the allocated packets. + +NOTE: +Afte updating the BIOS image the appplication needs to communicate with the BIOS +for enabling the update on the next reboot. The application can then choose to +reboot the system imideately or not reboot the system and leave up to the user +to do a reboot. + + diff -uprN linux-2.6.11.8.ORIG/drivers/firmware/dell_rbu.c linux-2.6.11.8/drivers/firmware/dell_rbu.c --- linux-2.6.11.8.ORIG/drivers/firmware/dell_rbu.c 1969-12-31 18:00:00.000000000 -0600 +++ linux-2.6.11.8/drivers/firmware/dell_rbu.c 2005-05-13 12:38:20.047334448 -0500 @@ -0,0 +1,852 @@ +/* + * dell_rbu.c + * Bios Update driver for Dell systems + * Author: Dell Inc + * Abhay Salunke + * + * Copyright (C) 2004 Dell Inc. + * + * Remote BIOS Update (rbu) driver is used for updating DELL BIOS by creating + * entries in the /sys file systems on Linux 2.6 and higher kernels. + * The driver supports two mechanism to update the BIOS namely contiguous and packetized. + * Both these methods still require to have some application to set the + * CMOS bit indicating the BIOS to update itself after a reboot. + * + * Contiguous method: + * This driver tries to allocates contiguos physical pages large enough + * to accomodate the BIOS image size specified by the user. The user + * supplied BIOS image is then copied in to the allocated contiguous pages. + * + * Packetized method: + * In case of packetized the driver provides entries in the /sys file systems + * as packetdatasize and packetdata. This driver requires an application to + * break the BIOS image in to fixed sized packet chunks and each packet is written + * to the packetdata entry. The packetdatasize needs to be set once and is fixed + * for all the packets. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License v2.0 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. + * + * Changelog: + * + * 13 May 2005 Abhay Salunke + * Modified code with suggestions from Andrew Morton; + * + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define BIOS_SCAN_LIMIT 0xffffffff +MODULE_AUTHOR("Abhay Salunke "); +MODULE_DESCRIPTION("Driver for updating BIOS image on DELL systems"); +MODULE_LICENSE("GPL"); +MODULE_VERSION("0.6"); + +static struct _rbu_data { + void *image_update_buffer; + unsigned long image_update_buffer_size; + unsigned long bios_image_size; + unsigned long image_update_order_number; + spinlock_t lock; + unsigned long packet_read_count; + unsigned long packet_write_count; + unsigned long num_packets; + unsigned long packetsize; +} rbu_data; + +struct packet_data{ + struct list_head list; + size_t length; + void *data; + int ordernum; +}; + + +static struct packet_data packet_data_head; + +/* no default attributes yet. */ +static struct attribute * def_attrs[] = { NULL, }; + +/* don't use show and store attribute functions */ +static struct sysfs_ops rbu_attr_ops = { }; + +static struct kobj_type ktype_rbu = { + .sysfs_ops = &rbu_attr_ops, + .default_attrs = def_attrs, +}; + +static decl_subsys(rbu,&ktype_rbu,NULL); + +void init_packet_head(void) +{ + INIT_LIST_HEAD(&packet_data_head.list); + rbu_data.packet_write_count = 0; + rbu_data.packet_read_count = 0; + rbu_data.num_packets = 0; + rbu_data.packetsize = 0; +} + +static int fill_last_packet(void *data, size_t length) +{ + struct list_head *ptemp_list; + struct packet_data *ppacket = NULL; + int packet_count = 0; + + pr_debug("fill_last_packet: entry \n"); + + /* check if we have any packets */ + if (0 == rbu_data.num_packets) { + pr_debug("fill_last_packet: num_packets=0\n"); + return -ENOMEM; + } + + packet_count = rbu_data.num_packets; + + ptemp_list = (&packet_data_head.list)->next; + + while(--packet_count) { + ptemp_list = ptemp_list->next; + } + + ppacket = list_entry(ptemp_list,struct packet_data, list); + + if ((rbu_data.packet_write_count + length) > rbu_data.packetsize) { + printk(KERN_WARNING "fill_last_packet: packet size data overrun\n"); + return -ENOMEM; + } + + pr_debug("fill_last_packet : buffer = %p\n", ppacket->data); + + /* copy the incoming data in to the new buffer */ + memcpy(((char *)ppacket->data + rbu_data.packet_write_count), + data, length); + + if ((rbu_data.packet_write_count + length) == rbu_data.packetsize) { + /* this was the last data chunk in the packet + so reinitialize the packet data counter to zero */ + rbu_data.packet_write_count = 0; + } else { + /* adjust the total packet length */ + rbu_data.packet_write_count += length; + } + pr_debug("fill_last_packet: exit \n"); + return 0; +} + +/* + get_free_pages_limited: + This is a helper function which allocates free pages based on an upper limit. + On x86_64 or 64 bit arch the memory allocation goes above 4GB space which is + not addressable by the BIOS. This function tries to get allocation below the + limit (4GB) address. It first tries to allocate memory normally using the + GFP_KERNEL argument if the incoming limit is non-zero and if the returned + physical memory address exceeds the upper limit, the allocated pages are freed + and the memory is reallocated using the GFP_DMA argument. +*/ +static void *get_free_pages_limited(unsigned long size, + int *ordernum, + unsigned long limit) +{ + unsigned long img_buf_phys_addr; + void *pbuf = NULL; + + *ordernum = get_order(size); + /* + * Check if we are not getting a very large file. This can happen as a + * user error in entering the file size + */ + if (*ordernum == BITS_PER_LONG) { + /* The incoming size is very large */ + pr_debug("get_free_pages_limited: Incoming size is very large\n"); + return NULL; + } + + /* try allocating a new buffer to fit the request */ + pbuf =(unsigned char *)__get_free_pages(GFP_KERNEL, *ordernum); + + if (pbuf != NULL) { + /* check if the image is with in limits */ + img_buf_phys_addr = (unsigned long)virt_to_phys((void *)pbuf); + + if ((limit != 0) && ((img_buf_phys_addr + size) > limit)) { + pr_debug("Got memory above 4GB range, free this and try with DMA memory\n"); + /* free this memory as we need it with in 4GB range */ + free_pages ((unsigned long)pbuf, *ordernum); + /* + * Try allocating a new buffer from the GFP_DMA range + * as it is with in 16MB range. + */ + pbuf =(unsigned char *)__get_free_pages(GFP_DMA, *ordernum); + if (pbuf == NULL) + pr_debug("Failed to get memory of size %ld using GFP_DMA\n", size); + } + } + return pbuf; +} + +static int create_packet(size_t length) +{ + struct packet_data *newpacket; + int ordernum = 0; + + pr_debug("create_packet: entry \n"); + + if (rbu_data.packetsize == 0 ) { + pr_debug("create_packet: packetsize not specified\n"); + return -EINVAL; + } + + newpacket = kmalloc(sizeof(struct packet_data) ,GFP_KERNEL); + if(newpacket == NULL) { + printk(KERN_WARNING"create_packet: failed to allocate new packet\n"); + return -ENOMEM; + } + + /* there is no upper limit on memory address for packetized mechanism */ + newpacket->data = get_free_pages_limited(rbu_data.packetsize,&ordernum, 0); + pr_debug("create_packet: newpacket %p\n", newpacket->data); + + if(newpacket->data == NULL) { + printk(KERN_WARNING"create_packet: failed to allocate new packet\n"); + return -ENOMEM; + } + + newpacket->ordernum = ordernum; + ++rbu_data.num_packets; + /* initialize the newly created packet headers */ + INIT_LIST_HEAD(&newpacket->list); + /* add this packet to the link list */ + list_add_tail(&newpacket->list, &packet_data_head.list); + /* + * packets are of fixed sizes so initialize + * the length to rbu_data.packetsize + */ + newpacket->length = rbu_data.packetsize; + + pr_debug("create_packet: exit \n"); + + return 0; +} + + +static int packetize_data(void *data, size_t length) +{ + int rc = 0; + + pr_debug("packetize_data : entry\n"); + if (rbu_data.packet_write_count == 0) { + /* create a new packet */ + if ((rc = create_packet(length)) != 0 ) + return rc; + } + /* fill data in to the packet */ + if ((rc = fill_last_packet(data, length)) != 0) + return rc; + + pr_debug("packetize_data : exit\n"); + return rc; +} + + +/* + do_packet_read : + This is a helper function which reads the packet data of the + current list. + data: is the incoming buffer + ptemp_list: points to the incoming list item + length: is the length of the free space in the buffer. + bytes_read: is the total number of bytes read already from + the packet list + list_read_count: is the counter to keep track of the number + of bytes read out of each packet. +*/ +int do_packet_read(char *data, + struct list_head *ptemp_list, + int length, + int bytes_read, + int *list_read_count) +{ + void *ptemp_buf; + struct packet_data *newpacket = NULL; + int bytes_copied = 0; + int j = 0; + + newpacket = list_entry(ptemp_list,struct packet_data, list); + *list_read_count += newpacket->length; + + if (*list_read_count > bytes_read) { + /* point to the start of unread data */ + j = newpacket->length - (*list_read_count - bytes_read); + /* point to the offset in the packet buffer*/ + ptemp_buf = (u8 *)newpacket->data + j; + /* check if there is enough room in the incoming buffer*/ + if (length > (*list_read_count - bytes_read)) + /* copy what ever is there in this packet and move on*/ + bytes_copied = (*list_read_count - bytes_read); + else + /* copy the remaining */ + bytes_copied = length; + memcpy(data, ptemp_buf, bytes_copied); + } + return bytes_copied; +} + +/* + packet_read_list: + This function reads the data out of the packet link list. + It will read data from multiple packets depending upon the + size of the incoming buffer. + data: is the incoming buffer pointer + *pread_length: is the length of the incoming buffer. At return + this value is adjusted to the actual size of the data read. +*/ +static int packet_read_list(char *data, size_t *pread_length) +{ + struct list_head *ptemp_list; + int temp_count = 0; + int bytes_copied = 0; + int bytes_read = 0; + int remaining_bytes =0; + char *pdest = data; + + /* check if we have any packets */ + if (0 == rbu_data.num_packets) + return -ENOMEM; + + remaining_bytes = *pread_length; + /* get the current read count */ + bytes_read = rbu_data.packet_read_count; + + ptemp_list = (&packet_data_head.list)->next; + while(!list_empty(ptemp_list)) { + /* read data */ + bytes_copied = do_packet_read(pdest, ptemp_list, remaining_bytes, + bytes_read, &temp_count); + /* adjust the remaining bytes */ + remaining_bytes -= bytes_copied; + bytes_read += bytes_copied; + /* adjust the data pointer */ + pdest += bytes_copied; + + /* check if we reached end of buffer before reaching the last packet*/ + if (remaining_bytes == 0) + break; + + /* point to the next packet in the list */ + ptemp_list = ptemp_list->next; + } + /*finally set the bytes read */ + *pread_length = bytes_read - rbu_data.packet_read_count; + rbu_data.packet_read_count = bytes_read; + return 0; +} + +static void packet_empty_list(void) +{ + struct list_head *ptemp_list; + struct list_head *pnext_list; + struct packet_data *newpacket; + + ptemp_list = (&packet_data_head.list)->next; + while(!list_empty(ptemp_list)) { + newpacket = list_entry(ptemp_list, struct packet_data, list); + /* get the next list ptr before we delete this entry */ + pnext_list = ptemp_list->next; + /* remove the list entry */ + list_del(ptemp_list); + /* set the list to next */ + ptemp_list = pnext_list; + /* zero out the RBU packet memory before freeing */ + memset(newpacket->data, 0, rbu_data.packetsize); + /* free the memory pointed by this packet */ + free_pages((unsigned long)newpacket->data, newpacket->ordernum); + /* now free the packet*/ + kfree(newpacket); + } + rbu_data.packet_write_count = 0; + rbu_data.packet_read_count = 0; + rbu_data.num_packets = 0; +} + + +/* + img_update_free: + Frees the buffer allocated for storing BIOS image + Always called with lock held and returned with lock held +*/ +static void img_update_free( void) +{ + if (rbu_data.image_update_buffer == NULL) + return; + + /* zero out this buffer before freeing it */ + memset(rbu_data.image_update_buffer, 0, rbu_data.image_update_buffer_size); + free_pages((unsigned long)rbu_data.image_update_buffer, + rbu_data.image_update_order_number); + /* Re-initialize the rbu_data variables after a free */ + rbu_data.image_update_buffer = NULL; + rbu_data.image_update_buffer_size = 0; + rbu_data.bios_image_size = 0; +} + +/* + img_update_realloc: + This function allocates the contiguous pages to accomodate the requested + size of data. The memory address and size values are stored globally and + on every call to this function the new size is checked to see if more + data is required than the existing size. If true the previous memory is freed + and new allocation is done to accomodate the new size. If the incoming size is + less then than the already allocated size, then that memory is reused. + This function is called with lock held and returna with lock held. +*/ +static int img_update_realloc(unsigned long size) +{ + unsigned char *image_update_buffer = NULL; + unsigned long rc; + int ordernum =0; + + + /* check if the buffer of sufficient size has been already allocated */ + if (rbu_data.image_update_buffer_size >= size) { + /* check for corruption */ + if ((size != 0) && (rbu_data.image_update_buffer == NULL)) { + pr_debug("img_update_realloc: corruption check failed\n"); + return -EINVAL; + } + /* we have a valid pre-allocated buffer with sufficient size */ + return 0; + } + + /* free any previously allocated buffer */ + img_update_free(); + + /* This has already been called as locked so we can now unlock + and proceed to calling get_free_pages_limited as this function + can sleep*/ + spin_unlock(&rbu_data.lock); + + image_update_buffer = (unsigned char *)get_free_pages_limited(size, + &ordernum, + BIOS_SCAN_LIMIT); + + /* acquire the spinlock again */ + spin_lock(&rbu_data.lock); + + if (image_update_buffer != NULL) { + /* store address for the new buffer */ + rbu_data.image_update_buffer = image_update_buffer; + /* adjust allocated size */ + rbu_data.image_update_buffer_size = PAGE_SIZE << ordernum; + /* save the current order number */ + rbu_data.image_update_order_number = ordernum; + /* initialize the new buffer data to 0 */ + memset(rbu_data.image_update_buffer,0, rbu_data.image_update_buffer_size); + pr_debug("img_update_realloc: success\n"); + /* success */ + rc = 0; + } else { + pr_debug("Not enough memory for image update:order number = %d" + ",size = %ld\n",ordernum, size); + rc = -ENOMEM; + } + + return rc; +} /* img_update_realloc */ + + +/* + read_packet_data_size: + Returns the size of an RBU packet; if no packets present returns 0 +*/ +static ssize_t read_packet_data_size(struct kobject *kobj, + char *buffer, + loff_t pos, + size_t count) +{ + unsigned int size = 0; + if (pos == 0) + size = sprintf(buffer, "%lu\n", rbu_data.packetsize); + return size; +} + +/* + write_packet_data_size: + Writes the RBU data size supplied by the user, if the + data size supplied is non zero number, this function + records the packet size for any packet allocations. + If a byte size of zero is supplied this function will free + the previously allocated packets. +*/ +static ssize_t write_packet_data_size(struct kobject *kobj, + char *buffer, + loff_t pos, + size_t count) +{ + int retval = count; + + spin_lock(&rbu_data.lock); + /* extract the image size */ + sscanf(buffer, "%lu",&rbu_data.packetsize); + /* free the previous packet lists */ + packet_empty_list(); + + spin_unlock(&rbu_data.lock); + return retval; +} + +/* + read_rbu_data_size: + Returns the size of an RBU image previously downloaded + if no image is downloaded the size returned is 0 +*/ +static ssize_t read_rbu_data_size(struct kobject *kobj, + char *buffer, + loff_t pos, + size_t count) +{ + unsigned int size = 0; + if (pos == 0) + size = sprintf(buffer, "%lu\n", rbu_data.bios_image_size); + return size; +} + +/* + write_rbu_data_size: + Writes the RBU data size supplied by the user, if the + data size supplied is non zero number, this function + allocates the contiguous physical memory pages for the + supplied size , if it fails this function returns error. + If a byte size of zero is supplied this function will free + the previously allocated contiguous pages. +*/ +static ssize_t write_rbu_data_size(struct kobject *kobj, + char *buffer, + loff_t pos, + size_t count) +{ + int retval = count; + + spin_lock(&rbu_data.lock); + /* extract the image size */ + sscanf(buffer, "%lu",&rbu_data.bios_image_size); + + if (rbu_data.bios_image_size !=0 ) { + if (img_update_realloc(rbu_data.bios_image_size) < 0) { + pr_debug("write_rbu_data_size: failed to allocate mem size %lu\n", + (unsigned long)rbu_data.bios_image_size); + rbu_data.bios_image_size = 0; + retval = -ENOMEM; + } + } else { + pr_debug(" freeing %ld size memory \n", rbu_data.bios_image_size); + /* free any allocated RBU memory */ + img_update_free(); + } + + pr_debug("write_rbu_data_size: = %lu\n", + (unsigned long)rbu_data.bios_image_size); + + spin_unlock(&rbu_data.lock); + return retval; +} /* write_rbu_data_size*/ + +/* + read_rbu_data: + Reads the BIOS image file from previously allocated contiguous physical + pages in to the buffer supplied in this call. + The reading is done in chunks of bytes supplied in the count argument. + The reading stops when the total number of bytes read equals the image + size given previously. + If image size is not specified or if the image size is zero this function + returns failure. + Parameters: + kobj is the kernel object + buffer is the pointer to the incoming data buffer. + count is the value of the incoming buffer size, + pos is the amount of bytes already read. +*/ +static ssize_t read_rbu_data(struct kobject *kobj, + char *buffer, + loff_t pos, + size_t count) +{ + unsigned char *ptemp = NULL; + int retval =0; + size_t bytes_left = 0; + size_t data_length = 0; + + spin_lock(&rbu_data.lock); + + /* check to see if we have something to return */ + if ((rbu_data.image_update_buffer == NULL) || + (rbu_data.bios_image_size == 0)) { + pr_debug("read_rbu_data: image_update_buffer %p ," + "bios_image_size %lu\n", + rbu_data.image_update_buffer, + rbu_data.bios_image_size); + retval = -ENOMEM; + goto read_rbu_data_exit; + } + + if ( pos > rbu_data.bios_image_size ) { + retval = 0; + goto read_rbu_data_exit; + } + + bytes_left = rbu_data.bios_image_size - pos; + data_length = max(bytes_left,count); + + ptemp = rbu_data.image_update_buffer; + memcpy(buffer, (ptemp + pos), data_length); + + if ((pos + count) > rbu_data.bios_image_size) + /* this was the last copy */ + retval = bytes_left; + else + retval = count; + +read_rbu_data_exit: + spin_unlock(&rbu_data.lock); + return retval; +} + +/* + write_rbu_data + Writes from the incoming BIOS image file to the pre-allocated + contiguous physical memory pages. + The writes occur in chunks of memory supplied by the count. The writes + stops when the total memory supplied equals the image size given previously. + If no memory size is previously specified or if the previously specified size + is zero the write returns error. +*/ +static ssize_t write_rbu_data(struct kobject *kobj, + char *buffer, + loff_t pos, + size_t count) +{ + unsigned char *pDest = NULL; + unsigned char *ptemp = NULL; + int retval = 0; + + spin_lock(&rbu_data.lock); + + /* check if the image size is given */ + if (0 == rbu_data.bios_image_size) { + printk(KERN_WARNING"write_rbu_data: BIOS image size not set\n"); + retval = -ENOMEM; + goto error_exit; + } + + if ((pos + count) > rbu_data.bios_image_size) { + pr_debug("write_rbu_data: data_over_run, file pos %lu " + "bios_image_size %lu\n", + (unsigned long)pos, + rbu_data.bios_image_size); + retval = -ENOMEM; + goto error_exit; + } + + pDest = (unsigned char*)rbu_data.image_update_buffer; + ptemp = pDest + pos; + memcpy(ptemp, buffer, count); + retval = count; + pr_debug("write_rbu_data : retval = %d\n", retval); +error_exit: + spin_unlock(&rbu_data.lock); + return retval; +} + +/* + read_rbu_packet_data: + Reads the BIOS image file from previously allocated contiguous physical + pages in to the buffer supplied in this call. + The reading is done in chunks of bytes supplied in the count argument. + The reading stops when the total number of bytes read equals the image + size given previously. + If image size is not specified or if the image size is zero this function + returns failure. + Parameters: + kobj is the kernel object + buffer is the pointer to the incoming data buffer. + count is the value of the incoming buffer size, + pos is the amount of bytes already read. +*/ +static ssize_t read_rbu_packet_data(struct kobject *kobj, + char *buffer, + loff_t pos, + size_t count) +{ + int retval; + size_t bytes_left; + size_t data_length; + char *ptempBuf = buffer; + unsigned long imagesize; + + spin_lock(&rbu_data.lock); + + /* check to see if we have something to return */ + if (rbu_data.num_packets == 0) { + pr_debug("read_rbu_packet_data: no packets written\n"); + retval = -ENOMEM; + goto read_rbu_data_exit; + } + + imagesize = rbu_data.num_packets * rbu_data.packetsize; + + if ( pos > imagesize ) { + retval = 0; + printk(KERN_WARNING"read_rbu_packet_data: data underrun\n"); + goto read_rbu_data_exit; + } + + bytes_left = imagesize - pos; + data_length = max(bytes_left, count); + + if ((retval = packet_read_list(ptempBuf, &data_length)) < 0) + goto read_rbu_data_exit; + + if ((pos + count) > imagesize) { + rbu_data.packet_read_count = 0; + /* this was the last copy */ + retval = bytes_left; + } + else + retval = count; + +read_rbu_data_exit: + spin_unlock(&rbu_data.lock); + return retval; +} + +/* + write_rbu_packet_data + Writes from the incoming BIOS image file to the pre-allocated + contiguous physical memory pages. + The writes occur in chunks of memory supplied by the count. The writes + stops when the total memory supplied equals the image size given previously. + If no memory size is previously specified or if the previously specified size + is zero the write returns error. +*/ +static ssize_t write_rbu_packet_data(struct kobject *kobj, + char *buffer, + loff_t pos, + size_t count) +{ + int retval = 0; + + spin_lock(&rbu_data.lock); + + /* check if the packet size is given */ + if (0 == rbu_data.packetsize) { + printk(KERN_WARNING"write_rbu_packet_data: packetsize not set\n"); + retval = -ENOMEM; + goto error_exit; + } + + if ((pos + count) > rbu_data.packetsize) { + pr_debug("write_rbu_packet_data: data_over_run, file pos %lu," + "packetsize %lu\n", + (unsigned long)pos, + rbu_data.packetsize); + retval = -ENOMEM; + + /* We have a write data overrun, obviously this is + not the corret file, so free the previous data*/ + pr_debug("data overrun freeing all the previous packets\n"); + packet_empty_list(); + goto error_exit; + } + + if ((retval = packetize_data(buffer, count)) < 0 ) { + pr_debug(KERN_WARNING"write_rbu_packet_data: packetize_data " + "failed with status %d\n", retval); + retval = -EIO; + goto error_exit; + } + + retval = count; + + pr_debug("write_rbu_packet_data : retval = %d\n", retval); + +error_exit: + spin_unlock(&rbu_data.lock); + return retval; +} + + +static struct bin_attribute rbudata_attr = { + .attr = {.name = "rbudata", .owner = THIS_MODULE, .mode = 0644}, + .read = read_rbu_data, + .write = write_rbu_data, +}; + +static struct bin_attribute rbudatasize_attr = { + .attr = { .name = "rbudatasize", .owner = THIS_MODULE, .mode = 0644 }, + .read = read_rbu_data_size, + .write= write_rbu_data_size, +}; + +static struct bin_attribute packetdatasize_attr = { + .attr = { .name = "packetdatasize", .owner = THIS_MODULE, .mode = 0644 }, + .read = read_packet_data_size, + .write= write_packet_data_size, +}; + +static struct bin_attribute packetdata_attr = { + .attr = { .name = "packetdata", .owner = THIS_MODULE, .mode = 0644 }, + .read = read_rbu_packet_data, + .write= write_rbu_packet_data, +}; + +static int __init dcdrbu_init(void) +{ + int rc; + + spin_lock_init(&rbu_data.lock); + + init_packet_head(); + + rc = firmware_register(&rbu_subsys); + if (rc < 0) { + printk(KERN_WARNING"dcdrbu_init: firmware_register failed\n"); + return rc; + } + + sysfs_create_bin_file(&rbu_subsys.kset.kobj,&rbudata_attr); + sysfs_create_bin_file(&rbu_subsys.kset.kobj,&rbudatasize_attr); + sysfs_create_bin_file(&rbu_subsys.kset.kobj,&packetdatasize_attr); + sysfs_create_bin_file(&rbu_subsys.kset.kobj,&packetdata_attr); + + return rc; +} + +static __exit void dcdrbu_exit( void) +{ + spin_lock(&rbu_data.lock); + packet_empty_list(); + img_update_free(); + spin_unlock(&rbu_data.lock); + sysfs_remove_bin_file(&rbu_subsys.kset.kobj, &rbudata_attr ); + sysfs_remove_bin_file(&rbu_subsys.kset.kobj, &rbudatasize_attr ); + sysfs_remove_bin_file(&rbu_subsys.kset.kobj, &packetdatasize_attr ); + sysfs_remove_bin_file(&rbu_subsys.kset.kobj, &packetdata_attr ); + firmware_unregister(&rbu_subsys); +} + +module_exit(dcdrbu_exit); +module_init(dcdrbu_init); + diff -uprN linux-2.6.11.8.ORIG/drivers/firmware/Kconfig linux-2.6.11.8/drivers/firmware/Kconfig --- linux-2.6.11.8.ORIG/drivers/firmware/Kconfig 2005-05-13 12:07:58.965181016 -0500 +++ linux-2.6.11.8/drivers/firmware/Kconfig 2005-05-13 12:07:00.566059032 -0500 @@ -58,4 +58,16 @@ config EFI_PCDP See +config DELL_RBU + tristate "BIOS update support for DELL systems via sysfs" + default n + help + Say Y if you want to have the option of updating the BIOS for your + DELL system. Note you need a supporting application to comunicate + with the BIOS regardign the new image for the image update to + take effect. + + See for more details on the driver. + + endmenu diff -uprN linux-2.6.11.8.ORIG/drivers/firmware/Makefile linux-2.6.11.8/drivers/firmware/Makefile --- linux-2.6.11.8.ORIG/drivers/firmware/Makefile 2005-05-13 12:08:12.839071864 -0500 +++ linux-2.6.11.8/drivers/firmware/Makefile 2005-05-09 15:15:16.000000000 -0500 @@ -4,3 +4,4 @@ obj-$(CONFIG_EDD) += edd.o obj-$(CONFIG_EFI_VARS) += efivars.o obj-$(CONFIG_EFI_PCDP) += pcdp.o +obj-$(CONFIG_DELL_RBU) += dell_rbu.o - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/