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/*
* Copyright (c) 2017, NVIDIA CORPORATION. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
*/
#include <nvgpu/pramin.h>
#include <nvgpu/page_allocator.h>
#include <nvgpu/enabled.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
void pramin_access_batch_rd_n(struct gk20a *g, u32 start, u32 words, u32 **arg)
{
u32 r = start, *dest_u32 = *arg;
if (!g->regs) {
__gk20a_warn_on_no_regs();
return;
}
while (words--) {
*dest_u32++ = gk20a_readl(g, r);
r += sizeof(u32);
}
*arg = dest_u32;
}
void pramin_access_batch_wr_n(struct gk20a *g, u32 start, u32 words, u32 **arg)
{
u32 r = start, *src_u32 = *arg;
if (!g->regs) {
__gk20a_warn_on_no_regs();
return;
}
while (words--) {
writel_relaxed(*src_u32++, g->regs + r);
r += sizeof(u32);
}
*arg = src_u32;
}
void pramin_access_batch_set(struct gk20a *g, u32 start, u32 words, u32 **arg)
{
u32 r = start, repeat = **arg;
if (!g->regs) {
__gk20a_warn_on_no_regs();
return;
}
while (words--) {
writel_relaxed(repeat, g->regs + r);
r += sizeof(u32);
}
}
/*
* 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;
for (sgl = sgt->sgl; sgl; sgl = nvgpu_sgt_get_next(sgt, sgl)) {
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;
}
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