mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-22 21:47:04 +07:00
9d23f9e946
With a 32-bit i, computing i<<PAGE_SHIFT might result in an overflow and in an eventual sign-extension. Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
404 lines
10 KiB
C
404 lines
10 KiB
C
/*
|
|
* Isochronous I/O functionality:
|
|
* - Isochronous DMA context management
|
|
* - Isochronous bus resource management (channels, bandwidth), client side
|
|
*
|
|
* Copyright (C) 2006 Kristian Hoegsberg <krh@bitplanet.net>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include <linux/dma-mapping.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/firewire.h>
|
|
#include <linux/firewire-constants.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/export.h>
|
|
|
|
#include <asm/byteorder.h>
|
|
|
|
#include "core.h"
|
|
|
|
/*
|
|
* Isochronous DMA context management
|
|
*/
|
|
|
|
int fw_iso_buffer_alloc(struct fw_iso_buffer *buffer, int page_count)
|
|
{
|
|
int i;
|
|
|
|
buffer->page_count = 0;
|
|
buffer->page_count_mapped = 0;
|
|
buffer->pages = kmalloc(page_count * sizeof(buffer->pages[0]),
|
|
GFP_KERNEL);
|
|
if (buffer->pages == NULL)
|
|
return -ENOMEM;
|
|
|
|
for (i = 0; i < page_count; i++) {
|
|
buffer->pages[i] = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
|
|
if (buffer->pages[i] == NULL)
|
|
break;
|
|
}
|
|
buffer->page_count = i;
|
|
if (i < page_count) {
|
|
fw_iso_buffer_destroy(buffer, NULL);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int fw_iso_buffer_map_dma(struct fw_iso_buffer *buffer, struct fw_card *card,
|
|
enum dma_data_direction direction)
|
|
{
|
|
dma_addr_t address;
|
|
int i;
|
|
|
|
buffer->direction = direction;
|
|
|
|
for (i = 0; i < buffer->page_count; i++) {
|
|
address = dma_map_page(card->device, buffer->pages[i],
|
|
0, PAGE_SIZE, direction);
|
|
if (dma_mapping_error(card->device, address))
|
|
break;
|
|
|
|
set_page_private(buffer->pages[i], address);
|
|
}
|
|
buffer->page_count_mapped = i;
|
|
if (i < buffer->page_count)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int fw_iso_buffer_init(struct fw_iso_buffer *buffer, struct fw_card *card,
|
|
int page_count, enum dma_data_direction direction)
|
|
{
|
|
int ret;
|
|
|
|
ret = fw_iso_buffer_alloc(buffer, page_count);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = fw_iso_buffer_map_dma(buffer, card, direction);
|
|
if (ret < 0)
|
|
fw_iso_buffer_destroy(buffer, card);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(fw_iso_buffer_init);
|
|
|
|
int fw_iso_buffer_map_vma(struct fw_iso_buffer *buffer,
|
|
struct vm_area_struct *vma)
|
|
{
|
|
unsigned long uaddr;
|
|
int i, err;
|
|
|
|
uaddr = vma->vm_start;
|
|
for (i = 0; i < buffer->page_count; i++) {
|
|
err = vm_insert_page(vma, uaddr, buffer->pages[i]);
|
|
if (err)
|
|
return err;
|
|
|
|
uaddr += PAGE_SIZE;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void fw_iso_buffer_destroy(struct fw_iso_buffer *buffer,
|
|
struct fw_card *card)
|
|
{
|
|
int i;
|
|
dma_addr_t address;
|
|
|
|
for (i = 0; i < buffer->page_count_mapped; i++) {
|
|
address = page_private(buffer->pages[i]);
|
|
dma_unmap_page(card->device, address,
|
|
PAGE_SIZE, buffer->direction);
|
|
}
|
|
for (i = 0; i < buffer->page_count; i++)
|
|
__free_page(buffer->pages[i]);
|
|
|
|
kfree(buffer->pages);
|
|
buffer->pages = NULL;
|
|
buffer->page_count = 0;
|
|
buffer->page_count_mapped = 0;
|
|
}
|
|
EXPORT_SYMBOL(fw_iso_buffer_destroy);
|
|
|
|
/* Convert DMA address to offset into virtually contiguous buffer. */
|
|
size_t fw_iso_buffer_lookup(struct fw_iso_buffer *buffer, dma_addr_t completed)
|
|
{
|
|
size_t i;
|
|
dma_addr_t address;
|
|
ssize_t offset;
|
|
|
|
for (i = 0; i < buffer->page_count; i++) {
|
|
address = page_private(buffer->pages[i]);
|
|
offset = (ssize_t)completed - (ssize_t)address;
|
|
if (offset > 0 && offset <= PAGE_SIZE)
|
|
return (i << PAGE_SHIFT) + offset;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct fw_iso_context *fw_iso_context_create(struct fw_card *card,
|
|
int type, int channel, int speed, size_t header_size,
|
|
fw_iso_callback_t callback, void *callback_data)
|
|
{
|
|
struct fw_iso_context *ctx;
|
|
|
|
ctx = card->driver->allocate_iso_context(card,
|
|
type, channel, header_size);
|
|
if (IS_ERR(ctx))
|
|
return ctx;
|
|
|
|
ctx->card = card;
|
|
ctx->type = type;
|
|
ctx->channel = channel;
|
|
ctx->speed = speed;
|
|
ctx->header_size = header_size;
|
|
ctx->callback.sc = callback;
|
|
ctx->callback_data = callback_data;
|
|
|
|
return ctx;
|
|
}
|
|
EXPORT_SYMBOL(fw_iso_context_create);
|
|
|
|
void fw_iso_context_destroy(struct fw_iso_context *ctx)
|
|
{
|
|
ctx->card->driver->free_iso_context(ctx);
|
|
}
|
|
EXPORT_SYMBOL(fw_iso_context_destroy);
|
|
|
|
int fw_iso_context_start(struct fw_iso_context *ctx,
|
|
int cycle, int sync, int tags)
|
|
{
|
|
return ctx->card->driver->start_iso(ctx, cycle, sync, tags);
|
|
}
|
|
EXPORT_SYMBOL(fw_iso_context_start);
|
|
|
|
int fw_iso_context_set_channels(struct fw_iso_context *ctx, u64 *channels)
|
|
{
|
|
return ctx->card->driver->set_iso_channels(ctx, channels);
|
|
}
|
|
|
|
int fw_iso_context_queue(struct fw_iso_context *ctx,
|
|
struct fw_iso_packet *packet,
|
|
struct fw_iso_buffer *buffer,
|
|
unsigned long payload)
|
|
{
|
|
return ctx->card->driver->queue_iso(ctx, packet, buffer, payload);
|
|
}
|
|
EXPORT_SYMBOL(fw_iso_context_queue);
|
|
|
|
void fw_iso_context_queue_flush(struct fw_iso_context *ctx)
|
|
{
|
|
ctx->card->driver->flush_queue_iso(ctx);
|
|
}
|
|
EXPORT_SYMBOL(fw_iso_context_queue_flush);
|
|
|
|
int fw_iso_context_flush_completions(struct fw_iso_context *ctx)
|
|
{
|
|
return ctx->card->driver->flush_iso_completions(ctx);
|
|
}
|
|
EXPORT_SYMBOL(fw_iso_context_flush_completions);
|
|
|
|
int fw_iso_context_stop(struct fw_iso_context *ctx)
|
|
{
|
|
return ctx->card->driver->stop_iso(ctx);
|
|
}
|
|
EXPORT_SYMBOL(fw_iso_context_stop);
|
|
|
|
/*
|
|
* Isochronous bus resource management (channels, bandwidth), client side
|
|
*/
|
|
|
|
static int manage_bandwidth(struct fw_card *card, int irm_id, int generation,
|
|
int bandwidth, bool allocate)
|
|
{
|
|
int try, new, old = allocate ? BANDWIDTH_AVAILABLE_INITIAL : 0;
|
|
__be32 data[2];
|
|
|
|
/*
|
|
* On a 1394a IRM with low contention, try < 1 is enough.
|
|
* On a 1394-1995 IRM, we need at least try < 2.
|
|
* Let's just do try < 5.
|
|
*/
|
|
for (try = 0; try < 5; try++) {
|
|
new = allocate ? old - bandwidth : old + bandwidth;
|
|
if (new < 0 || new > BANDWIDTH_AVAILABLE_INITIAL)
|
|
return -EBUSY;
|
|
|
|
data[0] = cpu_to_be32(old);
|
|
data[1] = cpu_to_be32(new);
|
|
switch (fw_run_transaction(card, TCODE_LOCK_COMPARE_SWAP,
|
|
irm_id, generation, SCODE_100,
|
|
CSR_REGISTER_BASE + CSR_BANDWIDTH_AVAILABLE,
|
|
data, 8)) {
|
|
case RCODE_GENERATION:
|
|
/* A generation change frees all bandwidth. */
|
|
return allocate ? -EAGAIN : bandwidth;
|
|
|
|
case RCODE_COMPLETE:
|
|
if (be32_to_cpup(data) == old)
|
|
return bandwidth;
|
|
|
|
old = be32_to_cpup(data);
|
|
/* Fall through. */
|
|
}
|
|
}
|
|
|
|
return -EIO;
|
|
}
|
|
|
|
static int manage_channel(struct fw_card *card, int irm_id, int generation,
|
|
u32 channels_mask, u64 offset, bool allocate)
|
|
{
|
|
__be32 bit, all, old;
|
|
__be32 data[2];
|
|
int channel, ret = -EIO, retry = 5;
|
|
|
|
old = all = allocate ? cpu_to_be32(~0) : 0;
|
|
|
|
for (channel = 0; channel < 32; channel++) {
|
|
if (!(channels_mask & 1 << channel))
|
|
continue;
|
|
|
|
ret = -EBUSY;
|
|
|
|
bit = cpu_to_be32(1 << (31 - channel));
|
|
if ((old & bit) != (all & bit))
|
|
continue;
|
|
|
|
data[0] = old;
|
|
data[1] = old ^ bit;
|
|
switch (fw_run_transaction(card, TCODE_LOCK_COMPARE_SWAP,
|
|
irm_id, generation, SCODE_100,
|
|
offset, data, 8)) {
|
|
case RCODE_GENERATION:
|
|
/* A generation change frees all channels. */
|
|
return allocate ? -EAGAIN : channel;
|
|
|
|
case RCODE_COMPLETE:
|
|
if (data[0] == old)
|
|
return channel;
|
|
|
|
old = data[0];
|
|
|
|
/* Is the IRM 1394a-2000 compliant? */
|
|
if ((data[0] & bit) == (data[1] & bit))
|
|
continue;
|
|
|
|
/* 1394-1995 IRM, fall through to retry. */
|
|
default:
|
|
if (retry) {
|
|
retry--;
|
|
channel--;
|
|
} else {
|
|
ret = -EIO;
|
|
}
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void deallocate_channel(struct fw_card *card, int irm_id,
|
|
int generation, int channel)
|
|
{
|
|
u32 mask;
|
|
u64 offset;
|
|
|
|
mask = channel < 32 ? 1 << channel : 1 << (channel - 32);
|
|
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);
|
|
}
|
|
|
|
/**
|
|
* fw_iso_resource_manage() - Allocate or deallocate a channel and/or bandwidth
|
|
*
|
|
* In parameters: card, generation, channels_mask, bandwidth, allocate
|
|
* Out parameters: channel, bandwidth
|
|
* This function blocks (sleeps) during communication with the IRM.
|
|
*
|
|
* Allocates or deallocates at most one channel out of channels_mask.
|
|
* channels_mask is a bitfield with MSB for channel 63 and LSB for channel 0.
|
|
* (Note, the IRM's CHANNELS_AVAILABLE is a big-endian bitfield with MSB for
|
|
* channel 0 and LSB for channel 63.)
|
|
* Allocates or deallocates as many bandwidth allocation units as specified.
|
|
*
|
|
* Returns channel < 0 if no channel was allocated or deallocated.
|
|
* Returns bandwidth = 0 if no bandwidth was allocated or deallocated.
|
|
*
|
|
* If generation is stale, deallocations succeed but allocations fail with
|
|
* channel = -EAGAIN.
|
|
*
|
|
* If channel allocation fails, no bandwidth will be allocated either.
|
|
* If bandwidth allocation fails, no channel will be allocated either.
|
|
* But deallocations of channel and bandwidth are tried independently
|
|
* of each other's success.
|
|
*/
|
|
void fw_iso_resource_manage(struct fw_card *card, int generation,
|
|
u64 channels_mask, int *channel, int *bandwidth,
|
|
bool allocate)
|
|
{
|
|
u32 channels_hi = channels_mask; /* channels 31...0 */
|
|
u32 channels_lo = channels_mask >> 32; /* channels 63...32 */
|
|
int irm_id, ret, c = -EINVAL;
|
|
|
|
spin_lock_irq(&card->lock);
|
|
irm_id = card->irm_node->node_id;
|
|
spin_unlock_irq(&card->lock);
|
|
|
|
if (channels_hi)
|
|
c = manage_channel(card, irm_id, generation, channels_hi,
|
|
CSR_REGISTER_BASE + CSR_CHANNELS_AVAILABLE_HI,
|
|
allocate);
|
|
if (channels_lo && c < 0) {
|
|
c = manage_channel(card, irm_id, generation, channels_lo,
|
|
CSR_REGISTER_BASE + CSR_CHANNELS_AVAILABLE_LO,
|
|
allocate);
|
|
if (c >= 0)
|
|
c += 32;
|
|
}
|
|
*channel = c;
|
|
|
|
if (allocate && channels_mask != 0 && c < 0)
|
|
*bandwidth = 0;
|
|
|
|
if (*bandwidth == 0)
|
|
return;
|
|
|
|
ret = manage_bandwidth(card, irm_id, generation, *bandwidth, allocate);
|
|
if (ret < 0)
|
|
*bandwidth = 0;
|
|
|
|
if (allocate && ret < 0) {
|
|
if (c >= 0)
|
|
deallocate_channel(card, irm_id, generation, c);
|
|
*channel = ret;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(fw_iso_resource_manage);
|