/*
* Copyright (c) 2017, NVIDIA CORPORATION. All rights reserved.
*
* 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
* THE AUTHORS OR COPYRIGHT HOLDERS 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 <nvgpu/pramin.h>
#include <nvgpu/page_allocator.h>
#include <nvgpu/enabled.h>
#include <nvgpu/vidmem.h>
#include "gk20a/gk20a.h"
/*
* Flip this to force all gk20a_mem* accesses via PRAMIN from the start of the
* boot, even for buffers that would work via cpu_va. In runtime, the flag is
* in debugfs, called "force_pramin".
*/
#define GK20A_FORCE_PRAMIN_DEFAULT false
/*
* The PRAMIN range is 1 MB, must change base addr if a buffer crosses that.
* This same loop is used for read/write/memset. Offset and size in bytes.
* One call to "loop" is done per range, with "arg" supplied.
*/
void nvgpu_pramin_access_batched(struct gk20a *g, struct nvgpu_mem *mem,
u32 offset, u32 size, pramin_access_batch_fn loop, u32 **arg)
{
struct nvgpu_page_alloc *alloc = NULL;
struct nvgpu_sgt *sgt;
void *sgl;
u32 byteoff, start_reg, until_end, n;
/*
* TODO: Vidmem is not accesible through pramin on shutdown path.
* driver should be refactored to prevent this from happening, but for
* now it is ok just to ignore the writes
*/
if (!g->regs && nvgpu_is_enabled(g, NVGPU_DRIVER_IS_DYING))
return;
alloc = get_vidmem_page_alloc(mem->priv.sgt->sgl);
sgt = &alloc->sgt;
nvgpu_sgt_for_each_sgl(sgl, sgt) {
if (offset >= nvgpu_sgt_get_length(sgt, sgl))
offset -= nvgpu_sgt_get_length(sgt, sgl);
else
break;
}
while (size) {
u32 sgl_len = (u32)nvgpu_sgt_get_length(sgt, sgl);
byteoff = g->ops.pramin.enter(g, mem, sgt, sgl,
offset / sizeof(u32));
start_reg = g->ops.pramin.data032_r(byteoff / sizeof(u32));
until_end = SZ_1M - (byteoff & (SZ_1M - 1));
n = min3(size, until_end, (u32)(sgl_len - offset));
loop(g, start_reg, n / sizeof(u32), arg);
/* read back to synchronize accesses */
gk20a_readl(g, start_reg);
g->ops.pramin.exit(g, mem, sgl);
size -= n;
if (n == (sgl_len - offset)) {
sgl = nvgpu_sgt_get_next(sgt, sgl);
offset = 0;
} else {
offset += n;
}
}
}
void nvgpu_init_pramin(struct mm_gk20a *mm)
{
mm->pramin_window = 0;
nvgpu_spinlock_init(&mm->pramin_window_lock);
mm->force_pramin = GK20A_FORCE_PRAMIN_DEFAULT;
}
