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Message-Id: <20251015045702.3022060-3-kumari.pallavi@oss.qualcomm.com>
Date: Wed, 15 Oct 2025 10:27:01 +0530
From: Kumari Pallavi <kumari.pallavi@....qualcomm.com>
To: kpallavi@....qualcomm.com, srini@...nel.org, amahesh@....qualcomm.com,
arnd@...db.de, gregkh@...uxfoundation.org
Cc: Kumari Pallavi <kumari.pallavi@....qualcomm.com>, quic_bkumar@...cinc.com,
ekansh.gupta@....qualcomm.com, linux-kernel@...r.kernel.org,
quic_chennak@...cinc.com, dri-devel@...ts.freedesktop.org,
linux-arm-msm@...r.kernel.org, jingyi.wang@....qualcomm.com,
aiqun.yu@....qualcomm.com, ktadakam@....qualcomm.com
Subject: [PATCH v2 2/3] misc: fastrpc: Add support for new DSP IOVA formatting
Implement the new IOVA formatting required by the DSP architecture change
on Kaanapali SoC. Place the SID for DSP DMA transactions at bit 56 in the
physical address. This placement is necessary for the DSPs to correctly
identify streams and operate as intended.
To address this, set SID position to bit 56 based on SoC-specific compatible
string from the root node within the physical address; otherwise, default to
legacy 32-bit placement.
This change ensures consistent SID placement across DSPs.
Signed-off-by: Kumari Pallavi <kumari.pallavi@....qualcomm.com>
---
drivers/misc/fastrpc.c | 59 +++++++++++++++++++++++++++++++++++++-----
1 file changed, 52 insertions(+), 7 deletions(-)
diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
index 975be54a2491..1a5d620b23f2 100644
--- a/drivers/misc/fastrpc.c
+++ b/drivers/misc/fastrpc.c
@@ -33,7 +33,6 @@
#define FASTRPC_ALIGN 128
#define FASTRPC_MAX_FDLIST 16
#define FASTRPC_MAX_CRCLIST 64
-#define FASTRPC_PHYS(p) ((p) & 0xffffffff)
#define FASTRPC_CTX_MAX (256)
#define FASTRPC_INIT_HANDLE 1
#define FASTRPC_DSP_UTILITIES_HANDLE 2
@@ -105,6 +104,15 @@
#define miscdev_to_fdevice(d) container_of(d, struct fastrpc_device, miscdev)
+/* Extract smmu pa from consolidated iova */
+#define IPA_TO_DMA_ADDR(iova, sid_pos) (iova & ((1ULL << sid_pos) - 1ULL))
+/*
+ * Prepare the consolidated iova to send to dsp by prepending the sid
+ * to smmu pa at the appropriate position
+ */
+#define IOVA_FROM_SID_PA(sid, phys, sid_pos) \
+ (phys += sid << sid_pos)
+
struct fastrpc_phy_page {
u64 addr; /* physical address */
u64 size; /* size of contiguous region */
@@ -257,6 +265,10 @@ struct fastrpc_session_ctx {
bool valid;
};
+struct fastrpc_soc_data {
+ u32 sid_pos;
+};
+
struct fastrpc_channel_ctx {
int domain_id;
int sesscount;
@@ -278,6 +290,7 @@ struct fastrpc_channel_ctx {
bool secure;
bool unsigned_support;
u64 dma_mask;
+ const struct fastrpc_soc_data *soc_data;
};
struct fastrpc_device {
@@ -387,7 +400,7 @@ static int fastrpc_map_lookup(struct fastrpc_user *fl, int fd,
static void fastrpc_buf_free(struct fastrpc_buf *buf)
{
dma_free_coherent(buf->dev, buf->size, buf->virt,
- FASTRPC_PHYS(buf->dma_addr));
+ IPA_TO_DMA_ADDR(buf->dma_addr, buf->fl->cctx->soc_data->sid_pos));
kfree(buf);
}
@@ -437,8 +450,7 @@ static int fastrpc_buf_alloc(struct fastrpc_user *fl, struct device *dev,
buf = *obuf;
if (fl->sctx && fl->sctx->sid)
- buf->dma_addr += ((u64)fl->sctx->sid << 32);
-
+ IOVA_FROM_SID_PA((u64)fl->sctx->sid, buf->dma_addr, fl->cctx->soc_data->sid_pos);
return 0;
}
@@ -682,7 +694,8 @@ static int fastrpc_dma_buf_attach(struct dma_buf *dmabuf,
return -ENOMEM;
ret = dma_get_sgtable(buffer->dev, &a->sgt, buffer->virt,
- FASTRPC_PHYS(buffer->dma_addr), buffer->size);
+ IPA_TO_DMA_ADDR(buffer->dma_addr, buffer->fl->cctx->soc_data->sid_pos),
+ buffer->size);
if (ret < 0) {
dev_err(buffer->dev, "failed to get scatterlist from DMA API\n");
kfree(a);
@@ -731,7 +744,8 @@ static int fastrpc_mmap(struct dma_buf *dmabuf,
dma_resv_assert_held(dmabuf->resv);
return dma_mmap_coherent(buf->dev, vma, buf->virt,
- FASTRPC_PHYS(buf->dma_addr), size);
+ IPA_TO_DMA_ADDR(buf->dma_addr,
+ buf->fl->cctx->soc_data->sid_pos), size);
}
static const struct dma_buf_ops fastrpc_dma_buf_ops = {
@@ -786,7 +800,8 @@ static int fastrpc_map_attach(struct fastrpc_user *fl, int fd,
map->dma_addr = sg_phys(map->table->sgl);
} else {
map->dma_addr = sg_dma_address(map->table->sgl);
- map->dma_addr += ((u64)fl->sctx->sid << 32);
+ IOVA_FROM_SID_PA((u64)fl->sctx->sid,
+ map->dma_addr, fl->cctx->soc_data->sid_pos);
}
for_each_sg(map->table->sgl, sgl, map->table->nents,
sgl_index)
@@ -2283,6 +2298,19 @@ static int fastrpc_get_domain_id(const char *domain)
return -EINVAL;
}
+static const struct fastrpc_soc_data kaanapali_soc_data = {
+ .sid_pos = 56,
+};
+
+static const struct fastrpc_soc_data default_soc_data = {
+ .sid_pos = 32,
+};
+
+static const struct of_device_id qcom_soc_match_table[] = {
+ { .compatible = "qcom,kaanapali", .data = &kaanapali_soc_data },
+ { },
+};
+
static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev)
{
struct device *rdev = &rpdev->dev;
@@ -2291,6 +2319,22 @@ static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev)
const char *domain;
bool secure_dsp;
unsigned int vmids[FASTRPC_MAX_VMIDS];
+ struct device_node *root;
+ const struct of_device_id *match;
+ const struct fastrpc_soc_data *soc_data = NULL;
+
+ root = of_find_node_by_path("/");
+ if (!root)
+ return -ENODEV;
+
+ match = of_match_node(qcom_soc_match_table, root);
+ of_node_put(root);
+ if (!match || !match->data) {
+ soc_data = &default_soc_data;
+ dev_dbg(rdev, "no compatible SoC found at root node\n");
+ } else {
+ soc_data = match->data;
+ }
err = of_property_read_string(rdev->of_node, "label", &domain);
if (err) {
@@ -2343,6 +2387,7 @@ static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev)
secure_dsp = !(of_property_read_bool(rdev->of_node, "qcom,non-secure-domain"));
data->secure = secure_dsp;
+ data->soc_data = soc_data;
switch (domain_id) {
case ADSP_DOMAIN_ID:
--
2.34.1
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