From e47d8761bb183a09c40eb678bbb23fbf5130d782 Mon Sep 17 00:00:00 2001
From: Devendar Gali <devendar.gali@amd.com>
Date: Mon, 27 May 2024 10:03:45 +0530
Subject: [PATCH] QDMA: Limit descriptor length for EQDMA Soft IP
EQDMA Soft 5.0 IP is designed to do only 64Kb-1 data transfer
per descriptor. So, limiting the descriptor length to 32Kb.
Signed-off-by: Devendar Gali <devendar.gali@amd.com>
---
QDMA/linux-kernel/driver/libqdma/qdma_descq.c | 19 +++++++++++++++++++
QDMA/linux-kernel/driver/libqdma/xdev.h | 12 ++++++++++++
2 files changed, 31 insertions(+)
diff --git a/QDMA/linux-kernel/driver/libqdma/qdma_descq.c b/QDMA/linux-kernel/driver/libqdma/qdma_descq.c
index db8e44e..9cc4e49 100755
--- a/QDMA/linux-kernel/driver/libqdma/qdma_descq.c
+++ b/QDMA/linux-kernel/driver/libqdma/qdma_descq.c
@@ -31,6 +31,9 @@
#include "qdma_context.h"
#include "qdma_st_c2h.h"
#include "qdma_access_common.h"
+#ifdef __XRT__
+#include "eqdma_soft_access.h"
+#endif
#include "thread.h"
#include "qdma_ul_ext.h"
#include "version.h"
@@ -196,6 +199,22 @@ static ssize_t descq_mm_proc_request(struct qdma_descq *descq)
qconf->aperture_size : QDMA_DESC_BLEN_MAX;
u8 keyhole_en = qconf->aperture_size ? 1 : 0;
u64 ep_addr_max = 0;
+#ifdef __XRT__
+ if (descq->xdev->version_info.ip_type == EQDMA_SOFT_IP) {
+ uint32_t ip_version;
+#ifndef __QDMA_VF__
+ uint8_t is_vf = 0;
+#else
+ uint8_t is_vf = 1;
+#endif
+ rv = eqdma_get_ip_version(descq->xdev, is_vf, &ip_version);
+ if (ip_version == EQDMA_IP_VERSION_5) {
+ pr_info("EQDMA Soft IP 5.0 supports descriptor length < 64K.\n");
+ aperture = qconf->aperture_size ?
+ qconf->aperture_size : SOFT_QDMA_DESC_BLEN_MAX;
+ }
+ }
+#endif
lock_descq(descq);
/* process completion of submitted requests */
diff --git a/QDMA/linux-kernel/driver/libqdma/xdev.h b/QDMA/linux-kernel/driver/libqdma/xdev.h
index 47c26b4..d79eb2b 100755
--- a/QDMA/linux-kernel/driver/libqdma/xdev.h
+++ b/QDMA/linux-kernel/driver/libqdma/xdev.h
@@ -95,6 +95,18 @@ enum qdma_pf_devices {
*/
#define QDMA_DESC_BLEN_MAX ((1 << (QDMA_DESC_BLEN_BITS)) - 1)
+#ifdef __XRT__
+/**
+ * number of bits to describe the SOFT DMA transfer descriptor
+ */
+#define SOFT_QDMA_DESC_BLEN_BITS 15
+
+/**
+ * maximum size of a single SOFT DMA transfer descriptor
+ */
+#define SOFT_QDMA_DESC_BLEN_MAX (1 << (SOFT_QDMA_DESC_BLEN_BITS))
+#endif
+
/**
* obtain the 32 most significant (high) bits of a 32-bit or 64-bit address
*/
--
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