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Commit 6403a163 authored by Merugu Tharun Kumar's avatar Merugu Tharun Kumar Committed by Edgar Flores
Browse files

msm: adsprpc: Cache invalidate optimization 



Avoid double invalidate operation by changing flags in cache
maintenance apis. Instead of invalidating whole buffer use
partial cache maintenance apis to invalidate only for length
user passed. Introducing offset based invalidate, when buffers
have partial or full overlap, avoid invalidation for overlap.
Cleaning inv_args_pre as there is no need for handling unaligned
buffers separately.

Change-Id: I7b38c3cfd924ab4f327c6dd664a087a4c9055dbb
Acked-by: default avatarDeepika Singh <dsi@qti.qualcomm.com>
Signed-off-by: default avatarMerugu Tharun Kumar <mtharu@codeaurora.org>
Signed-off-by: default avatarEdgar Flores <edgarf@codeaurora.org>
parent 1c22c901

drivers/char/adsprpc.c

+45 −64
Original line number Diff line number Diff line
@@ -1987,70 +1987,25 @@ static int put_args(uint32_t kernel, struct smq_invoke_ctx *ctx, 
	return err;

}



static void inv_args_pre(struct smq_invoke_ctx *ctx)

{

	int i, inbufs, outbufs;

	uint32_t sc = ctx->sc;

	remote_arg64_t *rpra = ctx->rpra;

	uintptr_t end;



	inbufs = REMOTE_SCALARS_INBUFS(sc);

	outbufs = REMOTE_SCALARS_OUTBUFS(sc);

	for (i = inbufs; i < inbufs + outbufs; ++i) {

		struct fastrpc_mmap *map = ctx->maps[i];



		if (map && map->uncached)

			continue;

		if (!rpra[i].buf.len)

			continue;

		if (ctx->fl->sctx->smmu.coherent &&

			!(map && (map->attr & FASTRPC_ATTR_NON_COHERENT)))

			continue;

		if (map && (map->attr & FASTRPC_ATTR_COHERENT))

			continue;

		if (map && (map->attr & FASTRPC_ATTR_FORCE_NOINVALIDATE))

			continue;



		if (buf_page_start(ptr_to_uint64((void *)rpra)) ==

				buf_page_start(rpra[i].buf.pv))

			continue;

		if (!IS_CACHE_ALIGNED((uintptr_t)

				uint64_to_ptr(rpra[i].buf.pv))) {

			if (map && map->buf) {

				dma_buf_begin_cpu_access(map->buf,

					DMA_BIDIRECTIONAL);

				dma_buf_end_cpu_access(map->buf,

					DMA_BIDIRECTIONAL);

			}

		}



		end = (uintptr_t)uint64_to_ptr(rpra[i].buf.pv +

							rpra[i].buf.len);

		if (!IS_CACHE_ALIGNED(end)) {

			if (map && map->buf) {

				dma_buf_begin_cpu_access(map->buf,

					DMA_BIDIRECTIONAL);

				dma_buf_end_cpu_access(map->buf,

					DMA_BIDIRECTIONAL);

			}

		}

	}

}



static void inv_args(struct smq_invoke_ctx *ctx)

{

	int i, inbufs, outbufs;

	uint32_t sc = ctx->sc;

	remote_arg64_t *rpra = ctx->lrpra;

	int err = 0;



	inbufs = REMOTE_SCALARS_INBUFS(sc);

	outbufs = REMOTE_SCALARS_OUTBUFS(sc);

	for (i = inbufs; i < inbufs + outbufs; ++i) {

		struct fastrpc_mmap *map = ctx->maps[i];

	for (i = 0; i < inbufs + outbufs; ++i) {

		int over = ctx->overps[i]->raix;

		struct fastrpc_mmap *map = ctx->maps[over];



		if ((over + 1 <= inbufs))

			continue;



		if (map && map->uncached)

			continue;

		if (!rpra[i].buf.len)

		if (!rpra[over].buf.len)

			continue;

		if (ctx->fl->sctx->smmu.coherent &&

			!(map && (map->attr & FASTRPC_ATTR_NON_COHERENT)))
@@ -2061,17 +2016,47 @@ static void inv_args(struct smq_invoke_ctx *ctx) 
			continue;



		if (buf_page_start(ptr_to_uint64((void *)rpra)) ==

				buf_page_start(rpra[i].buf.pv)) {

				buf_page_start(rpra[over].buf.pv)) {

			continue;

		}

		if (ctx->overps[i]->mstart) {

			if (map && map->buf) {

				if ((buf_page_size(ctx->overps[i]->mend -

				ctx->overps[i]->mstart)) == map->size) {

					dma_buf_begin_cpu_access(map->buf,

				DMA_FROM_DEVICE);

						DMA_TO_DEVICE);

					dma_buf_end_cpu_access(map->buf,

						DMA_FROM_DEVICE);

				} else {

					uintptr_t offset;

					struct vm_area_struct *vma;



					down_read(&current->mm->mmap_sem);

					VERIFY(err, NULL != (vma = find_vma(

						current->mm,

						ctx->overps[i]->mstart)));

					if (err) {

						up_read(&current->mm->mmap_sem);

						goto bail;

					}

					offset = buf_page_start(

						rpra[over].buf.pv) -

						vma->vm_start;

					up_read(&current->mm->mmap_sem);

					dma_buf_begin_cpu_access_partial(

						map->buf, DMA_TO_DEVICE, offset,

						ctx->overps[i]->mend -

						ctx->overps[i]->mstart);

					dma_buf_end_cpu_access_partial(map->buf,

						DMA_FROM_DEVICE, offset,

						ctx->overps[i]->mend -

						ctx->overps[i]->mstart);

				}

			}

		}



	}

bail:

	return;

}



static int fastrpc_invoke_send(struct smq_invoke_ctx *ctx,
@@ -2341,10 +2326,6 @@ static int fastrpc_internal_invoke(struct fastrpc_file *fl, uint32_t mode, 
			goto bail;

	}



	PERF(fl->profile, GET_COUNTER(perf_counter, PERF_INVARGS),

	inv_args_pre(ctx);

	PERF_END);



	PERF(fl->profile, GET_COUNTER(perf_counter, PERF_INVARGS),

	inv_args(ctx);

	PERF_END);