target/linux/bcm27xx/patches-5.15/950-0750-staging-vc-sm-cma-Avoid-log-spamming-on-Pi0-1-over-c.patch

   1 From 79dd0145cb8220a5be0007350a7501056378e720 Mon Sep 17 00:00:00 2001
   2 From: Dave Stevenson <dave.stevenson@raspberrypi.com>
   3 Date: Wed, 2 Mar 2022 17:23:16 +0000
   4 Subject: [PATCH] staging/vc-sm-cma: Avoid log spamming on Pi0/1 over
   5  cache alias.
   6
   7 Pi 0/1 use the 0x80000000 cache alias as the ARM also sees the world
   8 through the VPU L2 cache.
   9 vc-sm-cma was trying to ensure it was in an uncached alias (0xc), and
  10 complaining on every allocation if it weren't. Reduce this logging.
  11
  12 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
  13 ---
  14  drivers/staging/vc04_services/vc-sm-cma/vc_sm.c | 7 ++++++-
  15  1 file changed, 6 insertions(+), 1 deletion(-)
  16
  17 --- a/drivers/staging/vc04_services/vc-sm-cma/vc_sm.c
  18 +++ b/drivers/staging/vc04_services/vc-sm-cma/vc_sm.c
  19 @@ -720,6 +720,7 @@ vc_sm_cma_import_dmabuf_internal(struct
  20         struct dma_buf_attachment *attach = NULL;
  21         struct sg_table *sgt = NULL;
  22         dma_addr_t dma_addr;
  23 +       u32 cache_alias;
  24         int ret = 0;
  25         int status;
  26
  27 @@ -762,9 +763,13 @@ vc_sm_cma_import_dmabuf_internal(struct
  28         import.type = VC_SM_ALLOC_NON_CACHED;
  29         dma_addr = sg_dma_address(sgt->sgl);
  30         import.addr = (u32)dma_addr;
  31 -       if ((import.addr & 0xC0000000) != 0xC0000000) {
  32 +       cache_alias = import.addr & 0xC0000000;
  33 +       if (cache_alias != 0xC0000000 && cache_alias != 0x80000000) {
  34                 pr_err("%s: Expecting an uncached alias for dma_addr %pad\n",
  35                        __func__, &dma_addr);
  36 +               /* Note that this assumes we're on >= Pi2, but it implies a
  37 +                * DT configuration error.
  38 +                */
  39                 import.addr |= 0xC0000000;
  40         }
  41         import.size = sg_dma_len(sgt->sgl);