Techwizz/kernel-fxtec-pro1x
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

firewire: core: do not DMA-map stack addresses

Browse source 
The DMA mapping API cannot map on-stack addresses, as explained in
Documentation/DMA-mapping.txt.  Convert the two cases of on-stack packet
payload buffers in firewire-core (payload of lock requests in the bus
manager work and in iso resource management) to slab-allocated memory.

There are a number on-stack buffers for quadlet write or quadlet read
requests in firewire-core and firewire-sbp2.  These are harmless; they
are copied to/ from card driver internal DMA buffers since quadlet
payloads are inlined with packet headers.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
This commit is contained in:
Stefan Richter 2009-06-20 13:23:59 +02:00
parent 0c53decdd0
commit 6fdc037094
5 changed files with 26 additions and 20 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

14
drivers/firewire/core-card.c
View file

@ -196,8 +196,8 @@ static void allocate_broadcast_channel(struct fw_card *card, int generation)
{
int channel, bandwidth = 0;
fw_iso_resource_manage(card, generation, 1ULL << 31,
&channel, &bandwidth, true);
fw_iso_resource_manage(card, generation, 1ULL << 31, &channel,
&bandwidth, true, card->bm_transaction_data);
if (channel == 31) {
card->broadcast_channel_allocated = true;
device_for_each_child(card->device, (void *)(long)generation,
@ -230,7 +230,6 @@ static void fw_card_bm_work(struct work_struct *work)
bool do_reset = false;
bool root_device_is_running;
bool root_device_is_cmc;
__be32 lock_data[2];
spin_lock_irqsave(&card->lock, flags);
@ -273,22 +272,23 @@ static void fw_card_bm_work(struct work_struct *work)
goto pick_me;
}
lock_data[0] = cpu_to_be32(0x3f);
lock_data[1] = cpu_to_be32(local_id);
card->bm_transaction_data[0] = cpu_to_be32(0x3f);
card->bm_transaction_data[1] = cpu_to_be32(local_id);
spin_unlock_irqrestore(&card->lock, flags);
rcode = fw_run_transaction(card, TCODE_LOCK_COMPARE_SWAP,
irm_id, generation, SCODE_100,
CSR_REGISTER_BASE + CSR_BUS_MANAGER_ID,
lock_data, sizeof(lock_data));
card->bm_transaction_data,
sizeof(card->bm_transaction_data));
if (rcode == RCODE_GENERATION)
/* Another bus reset, BM work has been rescheduled. */
goto out;
if (rcode == RCODE_COMPLETE &&
lock_data[0] != cpu_to_be32(0x3f)) {
card->bm_transaction_data[0] != cpu_to_be32(0x3f)) {
/* Somebody else is BM. Only act as IRM. */
if (local_id == irm_id)

4
drivers/firewire/core-cdev.c
View file

@ -125,6 +125,7 @@ struct iso_resource {
int generation;
u64 channels;
s32 bandwidth;
__be32 transaction_data[2];
struct iso_resource_event *e_alloc, *e_dealloc;
};
@ -1049,7 +1050,8 @@ static void iso_resource_work(struct work_struct *work)
r->channels, &channel, &bandwidth,
todo == ISO_RES_ALLOC ||
todo == ISO_RES_REALLOC ||
todo == ISO_RES_ALLOC_ONCE);
todo == ISO_RES_ALLOC_ONCE,
r->transaction_data);
/*
* Is this generation outdated already? As long as this resource sticks
* in the idr, it will be scheduled again for a newer generation or at

24
drivers/firewire/core-iso.c
View file

@ -177,9 +177,8 @@ EXPORT_SYMBOL(fw_iso_context_stop);
*/
static int manage_bandwidth(struct fw_card *card, int irm_id, int generation,
int bandwidth, bool allocate)
int bandwidth, bool allocate, __be32 data[2])
{
__be32 data[2];
int try, new, old = allocate ? BANDWIDTH_AVAILABLE_INITIAL : 0;
/*
@ -215,9 +214,9 @@ static int manage_bandwidth(struct fw_card *card, int irm_id, int generation,
}
static int manage_channel(struct fw_card *card, int irm_id, int generation,
u32 channels_mask, u64 offset, bool allocate)
u32 channels_mask, u64 offset, bool allocate, __be32 data[2])
{
__be32 data[2], c, all, old;
__be32 c, all, old;
int i, retry = 5;
old = all = allocate ? cpu_to_be32(~0) : 0;
@ -260,7 +259,7 @@ static int manage_channel(struct fw_card *card, int irm_id, int generation,
}
static void deallocate_channel(struct fw_card *card, int irm_id,
int generation, int channel)
int generation, int channel, __be32 buffer[2])
{
u32 mask;
u64 offset;
@ -269,7 +268,7 @@ static void deallocate_channel(struct fw_card *card, int irm_id,
offset = channel < 32 ? CSR_REGISTER_BASE + CSR_CHANNELS_AVAILABLE_HI :
CSR_REGISTER_BASE + CSR_CHANNELS_AVAILABLE_LO;
manage_channel(card, irm_id, generation, mask, offset, false);
manage_channel(card, irm_id, generation, mask, offset, false, buffer);
}
/**
@ -298,7 +297,7 @@ static void deallocate_channel(struct fw_card *card, int irm_id,
*/
void fw_iso_resource_manage(struct fw_card *card, int generation,
u64 channels_mask, int *channel, int *bandwidth,
bool allocate)
bool allocate, __be32 buffer[2])
{
u32 channels_hi = channels_mask; /* channels 31...0 */
u32 channels_lo = channels_mask >> 32; /* channels 63...32 */
@ -310,10 +309,12 @@ void fw_iso_resource_manage(struct fw_card *card, int generation,
if (channels_hi)
c = manage_channel(card, irm_id, generation, channels_hi,
CSR_REGISTER_BASE + CSR_CHANNELS_AVAILABLE_HI, allocate);
CSR_REGISTER_BASE + CSR_CHANNELS_AVAILABLE_HI,
allocate, buffer);
if (channels_lo && c < 0) {
c = manage_channel(card, irm_id, generation, channels_lo,
CSR_REGISTER_BASE + CSR_CHANNELS_AVAILABLE_LO, allocate);
CSR_REGISTER_BASE + CSR_CHANNELS_AVAILABLE_LO,
allocate, buffer);
if (c >= 0)
c += 32;
}
@ -325,12 +326,13 @@ void fw_iso_resource_manage(struct fw_card *card, int generation,
if (*bandwidth == 0)
return;
ret = manage_bandwidth(card, irm_id, generation, *bandwidth, allocate);
ret = manage_bandwidth(card, irm_id, generation, *bandwidth,
allocate, buffer);
if (ret < 0)
*bandwidth = 0;
if (allocate && ret < 0 && c >= 0) {
deallocate_channel(card, irm_id, generation, c);
deallocate_channel(card, irm_id, generation, c, buffer);
*channel = ret;
}
}

3
drivers/firewire/core.h
View file

@ -120,7 +120,8 @@ void fw_node_event(struct fw_card *card, struct fw_node *node, int event);
int fw_iso_buffer_map(struct fw_iso_buffer *buffer, struct vm_area_struct *vma);
void fw_iso_resource_manage(struct fw_card *card, int generation,
u64 channels_mask, int *channel, int *bandwidth, bool allocate);
u64 channels_mask, int *channel, int *bandwidth,
bool allocate, __be32 buffer[2]);
/* -topology */

1
include/linux/firewire.h
View file

@ -127,6 +127,7 @@ struct fw_card {
struct delayed_work work;
int bm_retries;
int bm_generation;
__be32 bm_transaction_data[2];
bool broadcast_channel_allocated;
u32 broadcast_channel;