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Zhang References: <20250718234504.2702128-1-oreoluwa.babatunde@oss.qualcomm.com> In-Reply-To: <20250718234504.2702128-1-oreoluwa.babatunde@oss.qualcomm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Mailer: Microsoft Outlook 16.0 Thread-Index: AQHaaC3+8dss2V7QO4GBdf8o1CwMhLRLBUkQ Date: Mon, 28 Jul 2025 11:19:56 -0700 X-Gm-Features: Ac12FXyEMNUjpTsIjMVOLQB7ZpjEo5kL3JkRapfFIvnqbZF_n5dy7it1h3Sm2A0 Message-ID: Subject: RE: [PATCH v2] of: reserved_mem: Restructure call site for dma_contiguous_early_fixup() To: Oreoluwa Babatunde , robh@kernel.org, m.szyprowski@samsung.com, robin.murphy@arm.com Cc: saravanak@google.com, quic_obabatun@quicinc.com, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, iommu@lists.linux.dev, kernel@oss.qualcomm.com, will@kernel.org, djakov@kernel.org Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="000000000000dfdd1c063b015682" --000000000000dfdd1c063b015682 Content-Type: text/plain; charset="UTF-8" > -----Original Message----- > From: Oreoluwa Babatunde > Sent: Friday, July 18, 2025 4:45 PM > To: robh@kernel.org; m.szyprowski@samsung.com; robin.murphy@arm.com > Cc: saravanak@google.com; quic_obabatun@quicinc.com; > devicetree@vger.kernel.org; linux-kernel@vger.kernel.org; > iommu@lists.linux.dev; william.zhang@broadcom.com; > kernel@oss.qualcomm.com; will@kernel.org; djakov@kernel.org; Oreoluwa > Babatunde > Subject: [PATCH v2] of: reserved_mem: Restructure call site for > dma_contiguous_early_fixup() > > Restructure the call site for dma_contiguous_early_fixup() to > where the reserved_mem nodes are being parsed from the DT so that > dma_mmu_remap[] is populated before dma_contiguous_remap() is called. > > Fixes: 8a6e02d0c00e ("of: reserved_mem: Restructure how the reserved > memory regions are processed") > Signed-off-by: Oreoluwa Babatunde > > --- > v2: Add a check for the "reusable" property to narrow things down to > only cma regions. > Also add __weak function definition for dma_contiguous_early_fixup() > to avoid compile errors on architectures that do not define the > function. > > drivers/of/of_reserved_mem.c | 21 ++++++++++++++++++--- > kernel/dma/contiguous.c | 2 -- > 2 files changed, 18 insertions(+), 5 deletions(-) > > diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c > index 77016c0cc296..eee96172883a 100644 > --- a/drivers/of/of_reserved_mem.c > +++ b/drivers/of/of_reserved_mem.c > @@ -25,6 +25,7 @@ > #include > #include > #include > +#include > > #include "of_private.h" > > @@ -147,6 +148,11 @@ static int __init > early_init_dt_reserve_memory(phys_addr_t base, > return memblock_reserve(base, size); > } > > +void __weak > +dma_contiguous_early_fixup(phys_addr_t base, unsigned long size) > +{ > +} > + > /* > * __reserved_mem_reserve_reg() - reserve all memory described in 'reg' > property > */ > @@ -175,13 +181,18 @@ static int __init > __reserved_mem_reserve_reg(unsigned long node, > base = dt_mem_next_cell(dt_root_addr_cells, &prop); > size = dt_mem_next_cell(dt_root_size_cells, &prop); > > - if (size && > - early_init_dt_reserve_memory(base, size, nomap) == 0) > + if (size && early_init_dt_reserve_memory(base, size, nomap) > == 0) { > + /* Architecture specific contiguous memory fixup. */ > + if (of_flat_dt_is_compatible(node, "shared-dma-pool") > && > + of_get_flat_dt_prop(node, "reusable", NULL)) > + dma_contiguous_early_fixup(base, size); > + > pr_debug("Reserved memory: reserved region for node > '%s': base %pa, size %lu MiB\n", > uname, &base, (unsigned long)(size / SZ_1M)); > - else > + } else { > pr_err("Reserved memory: failed to reserve memory > for node '%s': base %pa, size %lu MiB\n", > uname, &base, (unsigned long)(size / SZ_1M)); > + } > > len -= t_len; > } > @@ -472,6 +483,10 @@ static int __init > __reserved_mem_alloc_size(unsigned long node, const char *unam > uname, (unsigned long)(size / SZ_1M)); > return -ENOMEM; > } > + /* Architecture specific contiguous memory fixup. */ > + if (of_flat_dt_is_compatible(node, "shared-dma-pool") && > + of_get_flat_dt_prop(node, "reusable", NULL)) > + dma_contiguous_early_fixup(base, size); > > /* Save region in the reserved_mem array */ > fdt_reserved_mem_save_node(node, uname, base, size); > diff --git a/kernel/dma/contiguous.c b/kernel/dma/contiguous.c > index 67af8a55185d..d9b9dcba6ff7 100644 > --- a/kernel/dma/contiguous.c > +++ b/kernel/dma/contiguous.c > @@ -483,8 +483,6 @@ static int __init rmem_cma_setup(struct > reserved_mem *rmem) > pr_err("Reserved memory: unable to setup CMA region\n"); > return err; > } > - /* Architecture specific contiguous memory fixup. */ > - dma_contiguous_early_fixup(rmem->base, rmem->size); > > if (default_cma) > dma_contiguous_default_area = cma; > -- > 2.34.1 Tested-by: William Zhang --000000000000dfdd1c063b015682 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: 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