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/*
* Copyright (c) 2006-2022, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2022-08-25 GuEe-GUI first version
*/
#include <drivers/pci_endpoint.h>
#define DBG_TAG "pci.ep.mem"
#define DBG_LVL DBG_INFO
#include <rtdbg.h>
rt_err_t rt_pci_ep_mem_array_init(struct rt_pci_ep *ep,
struct rt_pci_ep_mem *mems, rt_size_t mems_nr)
{
rt_size_t idx;
rt_err_t err = RT_EOK;
if (!ep || !mems)
{
return -RT_EINVAL;
}
rt_mutex_take(&ep->lock, RT_WAITING_FOREVER);
ep->mems_nr = mems_nr;
ep->mems = rt_calloc(mems_nr, sizeof(*ep->mems));
if (!ep->mems)
{
return -RT_ENOMEM;
}
for (idx = 0; idx < mems_nr; ++idx)
{
struct rt_pci_ep_mem *mem = &ep->mems[idx];
mem->cpu_addr = mems->cpu_addr;
mem->size = mems->size;
mem->page_size = mems->page_size;
mem->bits = mems->size / mems->page_size;
mem->map = rt_calloc(RT_BITMAP_LEN(mem->bits), sizeof(*mem->map));
if (!mem->map)
{
err = -RT_ENOMEM;
goto _out_lock;
}
}
_out_lock:
if (err)
{
while (idx --> 0)
{
rt_free(ep->mems[idx].map);
}
rt_free(ep->mems);
ep->mems_nr = 0;
ep->mems = RT_NULL;
}
rt_mutex_release(&ep->lock);
return err;
}
rt_err_t rt_pci_ep_mem_init(struct rt_pci_ep *ep,
rt_ubase_t cpu_addr, rt_size_t size, rt_size_t page_size)
{
struct rt_pci_ep_mem mem;
if (!ep)
{
return -RT_EINVAL;
}
mem.cpu_addr = cpu_addr;
mem.size = size;
mem.page_size = page_size;
return rt_pci_ep_mem_array_init(ep, &mem, 1);
}
static rt_ubase_t bitmap_region_alloc(struct rt_pci_ep_mem *mem, rt_size_t size)
{
rt_size_t bit, next_bit, end_bit, max_bits;
size /= mem->page_size;
max_bits = mem->bits - size;
rt_bitmap_for_each_clear_bit(mem->map, bit, max_bits)
{
end_bit = bit + size;
for (next_bit = bit + 1; next_bit < end_bit; ++next_bit)
{
if (rt_bitmap_test_bit(mem->map, next_bit))
{
bit = next_bit;
goto _next;
}
}
if (next_bit == end_bit)
{
while (next_bit --> bit)
{
rt_bitmap_set_bit(mem->map, next_bit);
}
return mem->cpu_addr + bit * mem->page_size;
}
_next:
}
return ~0ULL;
}
static void bitmap_region_free(struct rt_pci_ep_mem *mem,
rt_ubase_t cpu_addr, rt_size_t size)
{
rt_size_t bit = (cpu_addr - mem->cpu_addr) / mem->page_size, end_bit;
size /= mem->page_size;
end_bit = bit + size;
for (; bit < end_bit; ++bit)
{
rt_bitmap_clear_bit(mem->map, bit);
}
}
void *rt_pci_ep_mem_alloc(struct rt_pci_ep *ep,
rt_ubase_t *out_cpu_addr, rt_size_t size)
{
void *vaddr = RT_NULL;
if (!ep || !out_cpu_addr)
{
return vaddr;
}
rt_mutex_take(&ep->lock, RT_WAITING_FOREVER);
for (rt_size_t idx = 0; idx < ep->mems_nr; ++idx)
{
rt_ubase_t cpu_addr;
struct rt_pci_ep_mem *mem = &ep->mems[idx];
cpu_addr = bitmap_region_alloc(mem, size);
if (cpu_addr != ~0ULL)
{
vaddr = rt_ioremap((void *)cpu_addr, size);
if (!vaddr)
{
bitmap_region_free(mem, cpu_addr, size);
/* Try next memory */
continue;
}
*out_cpu_addr = cpu_addr;
break;
}
}
rt_mutex_release(&ep->lock);
return vaddr;
}
void rt_pci_ep_mem_free(struct rt_pci_ep *ep,
void *vaddr, rt_ubase_t cpu_addr, rt_size_t size)
{
if (!ep || !vaddr || !size)
{
return;
}
rt_mutex_take(&ep->lock, RT_WAITING_FOREVER);
for (rt_size_t idx = 0; idx < ep->mems_nr; ++idx)
{
struct rt_pci_ep_mem *mem = &ep->mems[idx];
if (mem->cpu_addr > cpu_addr &&
mem->cpu_addr + mem->size >= cpu_addr + size)
{
rt_iounmap(mem);
bitmap_region_free(mem, cpu_addr, size);
break;
}
}
rt_mutex_release(&ep->lock);
}
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