From patchwork Sat Apr 4 10:45:02 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marek Vasut X-Patchwork-Id: 237159 List-Id: U-Boot discussion From: marek.vasut at gmail.com (Marek Vasut) Date: Sat, 4 Apr 2020 12:45:02 +0200 Subject: [PATCH V2 1/5] common: bouncebuf: Permit passing custom alignment check function Message-ID: <20200404104506.386314-1-marek.vasut+renesas@gmail.com> Add extended version of the bounce_buffer_start(), which permits passing in a custom alignment checker function for the buffer. This is useful e.g. on systems with various DMA restrictions and where the checker function might be more complex than a simple CPU cache alignment check. Signed-off-by: Marek Vasut Cc: Daniel Schwierzeck Cc: Masahiro Yamada Cc: Peng Fan Cc: Simon Glass Cc: Tom Rini --- V2: No change --- common/bouncebuf.c | 20 +++++++++++++++----- include/bouncebuf.h | 15 +++++++++++++++ 2 files changed, 30 insertions(+), 5 deletions(-) diff --git a/common/bouncebuf.c b/common/bouncebuf.c index 614eb36c78..0ace152b98 100644 --- a/common/bouncebuf.c +++ b/common/bouncebuf.c @@ -31,17 +31,19 @@ static int addr_aligned(struct bounce_buffer *state) return 1; } -int bounce_buffer_start(struct bounce_buffer *state, void *data, - size_t len, unsigned int flags) +int bounce_buffer_start_extalign(struct bounce_buffer *state, void *data, + size_t len, unsigned int flags, + size_t alignment, + int (*addr_is_aligned)(struct bounce_buffer *state)) { state->user_buffer = data; state->bounce_buffer = data; state->len = len; - state->len_aligned = roundup(len, ARCH_DMA_MINALIGN); + state->len_aligned = roundup(len, alignment); state->flags = flags; - if (!addr_aligned(state)) { - state->bounce_buffer = memalign(ARCH_DMA_MINALIGN, + if (!addr_is_aligned(state)) { + state->bounce_buffer = memalign(alignment, state->len_aligned); if (!state->bounce_buffer) return -ENOMEM; @@ -62,6 +64,14 @@ int bounce_buffer_start(struct bounce_buffer *state, void *data, return 0; } +int bounce_buffer_start(struct bounce_buffer *state, void *data, + size_t len, unsigned int flags) +{ + return bounce_buffer_start_extalign(state, data, len, flags, + ARCH_DMA_MINALIGN, + addr_aligned); +} + int bounce_buffer_stop(struct bounce_buffer *state) { if (state->flags & GEN_BB_WRITE) { diff --git a/include/bouncebuf.h b/include/bouncebuf.h index fd9b0f3b28..7427bd12e2 100644 --- a/include/bouncebuf.h +++ b/include/bouncebuf.h @@ -62,6 +62,21 @@ struct bounce_buffer { */ int bounce_buffer_start(struct bounce_buffer *state, void *data, size_t len, unsigned int flags); + +/** + * bounce_buffer_start() -- Start the bounce buffer session with external align check function + * state: stores state passed between bounce_buffer_{start,stop} + * data: pointer to buffer to be aligned + * len: length of the buffer + * flags: flags describing the transaction, see above. + * alignment: alignment of the newly allocated bounce buffer + * addr_is_aligned: function for checking the alignment instead of the default one + */ +int bounce_buffer_start_extalign(struct bounce_buffer *state, void *data, + size_t len, unsigned int flags, + size_t alignment, + int (*addr_is_aligned)(struct bounce_buffer *state)); + /** * bounce_buffer_stop() -- Finish the bounce buffer session * state: stores state passed between bounce_buffer_{start,stop}