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ff9c3fc20a
Reduce the usage of nvgpu_vidmem_get_page_alloc() and friends as much as possible. This reduces the dependency of nvgpu on Linux SGLs. SGLs still need to be used, however, since sharing buffers in userspace is done by dma_buf FD. The best way to pass the vidmem buf through the dma_buf is by SGL pointer. JIRA NVGPU-30 JIRA NVGPU-138 Change-Id: Ide0e9e5a557f00aa63b063be085042101a5b34ee Signed-off-by: Alex Waterman <alexw@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/1540709 Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com> Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
100 lines
3.1 KiB
C
100 lines
3.1 KiB
C
/*
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* Copyright (c) 2017, NVIDIA CORPORATION. All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#include <nvgpu/pramin.h>
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#include <nvgpu/page_allocator.h>
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#include <nvgpu/enabled.h>
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#include "gk20a/gk20a.h"
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/*
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* Flip this to force all gk20a_mem* accesses via PRAMIN from the start of the
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* boot, even for buffers that would work via cpu_va. In runtime, the flag is
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* in debugfs, called "force_pramin".
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*/
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#define GK20A_FORCE_PRAMIN_DEFAULT false
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/*
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* The PRAMIN range is 1 MB, must change base addr if a buffer crosses that.
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* This same loop is used for read/write/memset. Offset and size in bytes.
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* One call to "loop" is done per range, with "arg" supplied.
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*/
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void nvgpu_pramin_access_batched(struct gk20a *g, struct nvgpu_mem *mem,
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u32 offset, u32 size, pramin_access_batch_fn loop, u32 **arg)
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{
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struct nvgpu_page_alloc *alloc = NULL;
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struct nvgpu_sgt *sgt;
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void *sgl;
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u32 byteoff, start_reg, until_end, n;
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/*
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* TODO: Vidmem is not accesible through pramin on shutdown path.
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* driver should be refactored to prevent this from happening, but for
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* now it is ok just to ignore the writes
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*/
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if (!g->regs && nvgpu_is_enabled(g, NVGPU_DRIVER_IS_DYING))
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return;
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alloc = mem->vidmem_alloc;
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sgt = &alloc->sgt;
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nvgpu_sgt_for_each_sgl(sgl, sgt) {
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if (offset >= nvgpu_sgt_get_length(sgt, sgl))
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offset -= nvgpu_sgt_get_length(sgt, sgl);
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else
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break;
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}
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while (size) {
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u32 sgl_len = (u32)nvgpu_sgt_get_length(sgt, sgl);
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byteoff = g->ops.pramin.enter(g, mem, sgt, sgl,
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offset / sizeof(u32));
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start_reg = g->ops.pramin.data032_r(byteoff / sizeof(u32));
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until_end = SZ_1M - (byteoff & (SZ_1M - 1));
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n = min3(size, until_end, (u32)(sgl_len - offset));
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loop(g, start_reg, n / sizeof(u32), arg);
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/* read back to synchronize accesses */
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gk20a_readl(g, start_reg);
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g->ops.pramin.exit(g, mem, sgl);
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size -= n;
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if (n == (sgl_len - offset)) {
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sgl = nvgpu_sgt_get_next(sgt, sgl);
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offset = 0;
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} else {
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offset += n;
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}
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}
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}
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void nvgpu_init_pramin(struct mm_gk20a *mm)
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{
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mm->pramin_window = 0;
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nvgpu_spinlock_init(&mm->pramin_window_lock);
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mm->force_pramin = GK20A_FORCE_PRAMIN_DEFAULT;
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}
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