[PATCH V5 16/17] i3c: mipi-i3c-hci: Consolidate DMA ring allocation
Adrian Hunter <[email protected]>
| Newsgroups | org.infradead.lists.linux-i3c,org.kernel.vger.linux-kernel |
|---|---|
| Organization | Intel Finland Oy, Registered Address: c/o Alberga Business Park, 6 krs, Bertel Jungin Aukio 5, 02600 Espoo, Business Identity Code: 0357606 - 4, Domiciled in Helsinki |
| Message-ID | <[email protected]> |
dma_alloc_coherent() allocates memory in whole pages, which can waste space when command and response queues are allocated separately. Allocate the DMA command and response queues from a single coherent allocation instead, while preserving the required 4-byte alignment. This reduces memory overhead without changing behavior. Signed-off-by: Adrian Hunter <[email protected]> Reviewed-by: Frank Li <[email protected]> --- Changes in V5: Added Frank's Rev'd-by Changes in V4: Cache allocation size in rh->xfer_alloc_sz to avoid recomputing in hci_dma_free() Changes in V3: None Changes in V2: Check for failed allocation before assignments to avoid doing arithmetic with NULL pointers drivers/i3c/master/mipi-i3c-hci/dma.c | 21 ++++++++------------- 1 file changed, 8 insertions(+), 13 deletions(-) diff --git a/drivers/i3c/master/mipi-i3c-hci/dma.c b/drivers/i3c/master/mipi-i3c-hci/dma.c index 9a01c740760f..0136f3064ada 100644 --- a/drivers/i3c/master/mipi-i3c-hci/dma.c +++ b/drivers/i3c/master/mipi-i3c-hci/dma.c @@ -130,7 +130,7 @@ struct hci_rh_data { dma_addr_t xfer_dma, resp_dma, ibi_status_dma, ibi_data_dma; unsigned int xfer_entries, ibi_status_entries, ibi_chunks_total; unsigned int xfer_struct_sz, resp_struct_sz, ibi_status_sz, ibi_chunk_sz; - unsigned int done_ptr, ibi_chunk_ptr, xfer_space; + unsigned int xfer_alloc_sz, done_ptr, ibi_chunk_ptr, xfer_space; struct hci_xfer **src_xfers; struct completion op_done; }; @@ -187,13 +187,7 @@ static void hci_dma_free(void *data) rh = &rings->headers[i]; if (rh->xfer) - dma_free_coherent(rings->sysdev, - rh->xfer_struct_sz * rh->xfer_entries, - rh->xfer, rh->xfer_dma); - if (rh->resp) - dma_free_coherent(rings->sysdev, - rh->resp_struct_sz * rh->xfer_entries, - rh->resp, rh->resp_dma); + dma_free_coherent(rings->sysdev, rh->xfer_alloc_sz, rh->xfer, rh->xfer_dma); kfree(rh->src_xfers); if (rh->ibi_status) dma_free_coherent(rings->sysdev, @@ -359,18 +353,19 @@ static int hci_dma_init(struct i3c_hci *hci) dev_dbg(&hci->master.dev, "xfer_struct_sz = %d, resp_struct_sz = %d", rh->xfer_struct_sz, rh->resp_struct_sz); - xfers_sz = rh->xfer_struct_sz * rh->xfer_entries; + xfers_sz = round_up(rh->xfer_struct_sz * rh->xfer_entries, 4); resps_sz = rh->resp_struct_sz * rh->xfer_entries; + rh->xfer_alloc_sz = xfers_sz + resps_sz; - rh->xfer = dma_alloc_coherent(rings->sysdev, xfers_sz, + rh->xfer = dma_alloc_coherent(rings->sysdev, rh->xfer_alloc_sz, &rh->xfer_dma, GFP_KERNEL); - rh->resp = dma_alloc_coherent(rings->sysdev, resps_sz, - &rh->resp_dma, GFP_KERNEL); rh->src_xfers = kzalloc_objs(*rh->src_xfers, rh->xfer_entries); ret = -ENOMEM; - if (!rh->xfer || !rh->resp || !rh->src_xfers) + if (!rh->xfer || !rh->src_xfers) goto err_out; + rh->resp = rh->xfer + xfers_sz; + rh->resp_dma = rh->xfer_dma + xfers_sz; /* IBIs */ -- 2.51.0 -- linux-i3c mailing list [email protected] http://lists.infradead.org/mailman/listinfo/linux-i3c