Message-ID: <20231121094844.5764-4-quic_ekangupt@quicinc.com>
Date:   Tue, 21 Nov 2023 15:18:42 +0530
From:   Ekansh Gupta <quic_ekangupt@...cinc.com>
To:     <srinivas.kandagatla@...aro.org>, <linux-arm-msm@...r.kernel.org>
CC:     <gregkh@...uxfoundation.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v7 3/5] misc: fastrpc: Capture kernel and DSP performance counters

Add support to capture kernel performance counters for different
kernel level operations. These counters collects the information
for remote call and copies the information to a buffer shared
by user.

Collection of DSP performance counters is also added as part of
this change. DSP updates the performance information in the
metadata which is then copied to a buffer passed by the user.

Signed-off-by: Ekansh Gupta <quic_ekangupt@...cinc.com>
---
Changes in v2:
  - Fixed compile time warnings
Changes in v3:
  - Squashed commits to get proper patch series
Changes in v7:
  - Rebase the patch to latest kernel version

 drivers/misc/fastrpc.c      | 141 ++++++++++++++++++++++++++++++++++--
 include/uapi/misc/fastrpc.h |  14 ++++
 2 files changed, 147 insertions(+), 8 deletions(-)

diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
index 55f126c779cb..cbcac0b3d09b 100644
--- a/drivers/misc/fastrpc.c
+++ b/drivers/misc/fastrpc.c
@@ -19,6 +19,7 @@
 #include <linux/rpmsg.h>
 #include <linux/scatterlist.h>
 #include <linux/slab.h>
+#include <linux/delay.h>
 #include <linux/firmware/qcom/qcom_scm.h>
 #include <uapi/misc/fastrpc.h>
 #include <linux/of_reserved_mem.h>
@@ -33,6 +34,8 @@
 #define FASTRPC_ALIGN		128
 #define FASTRPC_MAX_FDLIST	16
 #define FASTRPC_MAX_CRCLIST	64
+#define FASTRPC_KERNEL_PERF_LIST (PERF_KEY_MAX)
+#define FASTRPC_DSP_PERF_LIST 12
 #define FASTRPC_PHYS(p)	((p) & 0xffffffff)
 #define FASTRPC_CTX_MAX (256)
 #define FASTRPC_INIT_HANDLE	1
@@ -105,6 +108,27 @@
 
 #define miscdev_to_fdevice(d) container_of(d, struct fastrpc_device, miscdev)
 
+#define PERF_END ((void)0)
+
+#define PERF(enb, cnt, ff) \
+	{\
+		struct timespec64 startT = {0};\
+		uint64_t *counter = cnt;\
+		if (enb && counter) {\
+			ktime_get_real_ts64(&startT);\
+		} \
+		ff ;\
+		if (enb && counter) {\
+			*counter += getnstimediff(&startT);\
+		} \
+	}
+
+#define GET_COUNTER(perf_ptr, offset)  \
+	(perf_ptr != NULL ?\
+		(((offset >= 0) && (offset < PERF_KEY_MAX)) ?\
+			(uint64_t *)(perf_ptr + offset)\
+				: (uint64_t *)NULL) : (uint64_t *)NULL)
+
 static const char *domains[FASTRPC_DEV_MAX] = { "adsp", "mdsp",
 						"sdsp", "cdsp"};
 struct fastrpc_phy_page {
@@ -228,6 +252,19 @@ struct fastrpc_map {
 	struct kref refcount;
 };
 
+struct fastrpc_perf {
+	u64 count;
+	u64 flush;
+	u64 map;
+	u64 copy;
+	u64 link;
+	u64 getargs;
+	u64 putargs;
+	u64 invargs;
+	u64 invoke;
+	u64 tid;
+};
+
 struct fastrpc_invoke_ctx {
 	int nscalars;
 	int nbufs;
@@ -236,6 +273,8 @@ struct fastrpc_invoke_ctx {
 	int tgid;
 	u32 sc;
 	u32 *crc;
+	u64 *perf_kernel;
+	u64 *perf_dsp;
 	u64 ctxid;
 	u64 msg_sz;
 	struct kref refcount;
@@ -250,6 +289,7 @@ struct fastrpc_invoke_ctx {
 	struct fastrpc_invoke_args *args;
 	struct fastrpc_buf_overlap *olaps;
 	struct fastrpc_channel_ctx *cctx;
+	struct fastrpc_perf *perf;
 };
 
 struct fastrpc_session_ctx {
@@ -299,6 +339,7 @@ struct fastrpc_user {
 	struct fastrpc_session_ctx *sctx;
 	struct fastrpc_buf *init_mem;
 
+	u32 profile;
 	int tgid;
 	int pd;
 	bool is_secure_dev;
@@ -308,6 +349,17 @@ struct fastrpc_user {
 	struct mutex mutex;
 };
 
+static inline int64_t getnstimediff(struct timespec64 *start)
+{
+	int64_t ns;
+	struct timespec64 ts, b;
+
+	ktime_get_real_ts64(&ts);
+	b = timespec64_sub(ts, *start);
+	ns = timespec64_to_ns(&b);
+	return ns;
+}
+
 static void fastrpc_free_map(struct kref *ref)
 {
 	struct fastrpc_map *map;
@@ -493,6 +545,9 @@ static void fastrpc_context_free(struct kref *ref)
 	if (ctx->buf)
 		fastrpc_buf_free(ctx->buf);
 
+	if (ctx->fl->profile)
+		kfree(ctx->perf);
+
 	spin_lock_irqsave(&cctx->lock, flags);
 	idr_remove(&cctx->ctx_idr, ctx->ctxid >> 4);
 	spin_unlock_irqrestore(&cctx->lock, flags);
@@ -612,6 +667,14 @@ static struct fastrpc_invoke_ctx *fastrpc_context_alloc(
 	fastrpc_channel_ctx_get(cctx);
 
 	ctx->crc = (u32 *)(uintptr_t)invoke->crc;
+	ctx->perf_dsp = (u64 *)(uintptr_t)invoke->perf_dsp;
+	ctx->perf_kernel = (u64 *)(uintptr_t)invoke->perf_kernel;
+	if (ctx->fl->profile) {
+		ctx->perf = kzalloc(sizeof(*(ctx->perf)), GFP_KERNEL);
+		if (!ctx->perf)
+			return ERR_PTR(-ENOMEM);
+		ctx->perf->tid = ctx->fl->tgid;
+	}
 	ctx->sc = sc;
 	ctx->retval = -1;
 	ctx->pid = current->pid;
@@ -875,7 +938,8 @@ static int fastrpc_get_meta_size(struct fastrpc_invoke_ctx *ctx)
 		sizeof(struct fastrpc_invoke_buf) +
 		sizeof(struct fastrpc_phy_page)) * ctx->nscalars +
 		sizeof(u64) * FASTRPC_MAX_FDLIST +
-		sizeof(u32) * FASTRPC_MAX_CRCLIST;
+		sizeof(u32) * FASTRPC_MAX_CRCLIST +
+		sizeof(u32) + sizeof(u64) * FASTRPC_DSP_PERF_LIST;
 
 	return size;
 }
@@ -942,16 +1006,22 @@ static int fastrpc_get_args(u32 kernel, struct fastrpc_invoke_ctx *ctx)
 	int inbufs, i, oix, err = 0;
 	u64 len, rlen, pkt_size;
 	u64 pg_start, pg_end;
+	u64 *perf_counter = NULL;
 	uintptr_t args;
 	int metalen;
 
+	if (ctx->fl->profile)
+		perf_counter = (u64 *)ctx->perf + PERF_COUNT;
+
 	inbufs = REMOTE_SCALARS_INBUFS(ctx->sc);
 	metalen = fastrpc_get_meta_size(ctx);
 	pkt_size = fastrpc_get_payload_size(ctx, metalen);
 
+	PERF(ctx->fl->profile, GET_COUNTER(perf_counter, PERF_MAP),
 	err = fastrpc_create_maps(ctx);
 	if (err)
 		return err;
+	PERF_END);
 
 	ctx->msg_sz = pkt_size;
 
@@ -984,6 +1054,7 @@ static int fastrpc_get_args(u32 kernel, struct fastrpc_invoke_ctx *ctx)
 		if (ctx->maps[i]) {
 			struct vm_area_struct *vma = NULL;
 
+			PERF(ctx->fl->profile, GET_COUNTER(perf_counter, PERF_MAP),
 			rpra[i].buf.pv = (u64) ctx->args[i].ptr;
 			pages[i].addr = ctx->maps[i]->phys;
 
@@ -998,9 +1069,9 @@ static int fastrpc_get_args(u32 kernel, struct fastrpc_invoke_ctx *ctx)
 			pg_end = ((ctx->args[i].ptr + len - 1) & PAGE_MASK) >>
 				  PAGE_SHIFT;
 			pages[i].size = (pg_end - pg_start + 1) * PAGE_SIZE;
-
+			PERF_END);
 		} else {
-
+			PERF(ctx->fl->profile, GET_COUNTER(perf_counter, PERF_COPY),
 			if (ctx->olaps[oix].offset == 0) {
 				rlen -= ALIGN(args, FASTRPC_ALIGN) - args;
 				args = ALIGN(args, FASTRPC_ALIGN);
@@ -1022,12 +1093,14 @@ static int fastrpc_get_args(u32 kernel, struct fastrpc_invoke_ctx *ctx)
 			pages[i].size = (pg_end - pg_start + 1) * PAGE_SIZE;
 			args = args + mlen;
 			rlen -= mlen;
+			PERF_END);
 		}
 
 		if (i < inbufs && !ctx->maps[i]) {
 			void *dst = (void *)(uintptr_t)rpra[i].buf.pv;
 			void *src = (void *)(uintptr_t)ctx->args[i].ptr;
 
+			PERF(ctx->fl->profile, GET_COUNTER(perf_counter, PERF_COPY),
 			if (!kernel) {
 				if (copy_from_user(dst, (void __user *)src,
 						   len)) {
@@ -1037,6 +1110,7 @@ static int fastrpc_get_args(u32 kernel, struct fastrpc_invoke_ctx *ctx)
 			} else {
 				memcpy(dst, src, len);
 			}
+			PERF_END);
 		}
 	}
 
@@ -1067,9 +1141,9 @@ static int fastrpc_put_args(struct fastrpc_invoke_ctx *ctx,
 	struct fastrpc_map *mmap = NULL;
 	struct fastrpc_invoke_buf *list;
 	struct fastrpc_phy_page *pages;
-	u64 *fdlist;
-	u32 *crclist;
-	int i, inbufs, outbufs, handles;
+	u64 *fdlist, *perf_dsp_list;
+	u32 *crclist, *poll;
+	int i, inbufs, outbufs, handles, perferr;
 
 	inbufs = REMOTE_SCALARS_INBUFS(ctx->sc);
 	outbufs = REMOTE_SCALARS_OUTBUFS(ctx->sc);
@@ -1078,6 +1152,8 @@ static int fastrpc_put_args(struct fastrpc_invoke_ctx *ctx,
 	pages = fastrpc_phy_page_start(list, ctx->nscalars);
 	fdlist = (u64 *)(pages + inbufs + outbufs + handles);
 	crclist = (u32 *)(fdlist + FASTRPC_MAX_FDLIST);
+	poll = (u32 *)(crclist + FASTRPC_MAX_CRCLIST);
+	perf_dsp_list = (u64 *)(poll + 1);
 
 	for (i = inbufs; i < ctx->nbufs; ++i) {
 		if (!ctx->maps[i]) {
@@ -1103,8 +1179,16 @@ static int fastrpc_put_args(struct fastrpc_invoke_ctx *ctx,
 	}
 
 	if (ctx->crc && crclist && rpra) {
-		if (copy_to_user((void __user *)ctx->crc, crclist, FASTRPC_MAX_CRCLIST * sizeof(u32)))
+		if (copy_to_user((void __user *)ctx->crc, crclist,
+					FASTRPC_MAX_CRCLIST * sizeof(u32))) {
 			return -EFAULT;
+		}
+	}
+	if (ctx->perf_dsp && perf_dsp_list) {
+		perferr = copy_to_user((void __user *)ctx->perf_dsp,
+				perf_dsp_list, FASTRPC_DSP_PERF_LIST * sizeof(u64));
+		if (perferr)
+			dev_info(fl->sctx->dev, "Warning: failed to copy perf data %d\n", perferr);
 	}
 	return 0;
 }
@@ -1141,6 +1225,21 @@ static int fastrpc_invoke_send(struct fastrpc_session_ctx *sctx,
 
 }
 
+static void fastrpc_update_invoke_count(u32 handle, u64 *perf_counter,
+					struct timespec64 *invoket)
+{
+	u64 *invcount, *count;
+
+	invcount = GET_COUNTER(perf_counter, PERF_INVOKE);
+	if (invcount)
+		*invcount += getnstimediff(invoket);
+
+	count = GET_COUNTER(perf_counter, PERF_COUNT);
+	if (count)
+		*count += 1;
+}
+
+
 static int fastrpc_internal_invoke(struct fastrpc_user *fl,  u32 kernel,
 				   struct fastrpc_enhanced_invoke *invoke)
 {
@@ -1148,7 +1247,12 @@ static int fastrpc_internal_invoke(struct fastrpc_user *fl,  u32 kernel,
 	struct fastrpc_buf *buf, *b;
 	struct fastrpc_invoke *inv = &invoke->inv;
 	u32 handle, sc;
-	int err = 0;
+	u64 *perf_counter = NULL;
+	int err = 0, perferr = 0;
+	struct timespec64 invoket = {0};
+
+	if (fl->profile)
+		ktime_get_real_ts64(&invoket);
 
 	if (!fl->sctx)
 		return -EINVAL;
@@ -1167,16 +1271,22 @@ static int fastrpc_internal_invoke(struct fastrpc_user *fl,  u32 kernel,
 	if (IS_ERR(ctx))
 		return PTR_ERR(ctx);
 
+	if (fl->profile)
+		perf_counter = (u64 *)ctx->perf + PERF_COUNT;
+	PERF(fl->profile, GET_COUNTER(perf_counter, PERF_GETARGS),
 	err = fastrpc_get_args(kernel, ctx);
 	if (err)
 		goto bail;
+	PERF_END);
 
 	/* make sure that all CPU memory writes are seen by DSP */
 	dma_wmb();
+	PERF(fl->profile, GET_COUNTER(perf_counter, PERF_LINK),
 	/* Send invoke buffer to remote dsp */
 	err = fastrpc_invoke_send(fl->sctx, ctx, kernel, handle);
 	if (err)
 		goto bail;
+	PERF_END);
 
 	if (kernel) {
 		if (!wait_for_completion_timeout(&ctx->work, 10 * HZ))
@@ -1190,10 +1300,12 @@ static int fastrpc_internal_invoke(struct fastrpc_user *fl,  u32 kernel,
 
 	/* make sure that all memory writes by DSP are seen by CPU */
 	dma_rmb();
+	PERF(fl->profile, GET_COUNTER(perf_counter, PERF_PUTARGS),
 	/* populate all the output buffers with results */
 	err = fastrpc_put_args(ctx, kernel);
 	if (err)
 		goto bail;
+	PERF_END);
 
 	/* Check the response from remote dsp */
 	err = ctx->retval;
@@ -1214,6 +1326,15 @@ static int fastrpc_internal_invoke(struct fastrpc_user *fl,  u32 kernel,
 			list_del(&buf->node);
 			list_add_tail(&buf->node, &fl->cctx->invoke_interrupted_mmaps);
 		}
+	} else if (ctx) {
+		if (fl->profile && !err)
+			fastrpc_update_invoke_count(handle, perf_counter, &invoket);
+		if (fl->profile && ctx->perf && ctx->perf_kernel) {
+			perferr = copy_to_user((void __user *)ctx->perf_kernel,
+						ctx->perf, FASTRPC_KERNEL_PERF_LIST * sizeof(u64));
+			if (perferr)
+				dev_info(fl->sctx->dev, "Warning: failed to copy perf data %d\n", perferr);
+		}
 	}
 
 	if (err)
@@ -1712,6 +1833,7 @@ static int fastrpc_multimode_invoke(struct fastrpc_user *fl, char __user *argp)
 	struct fastrpc_invoke_args *args = NULL;
 	struct fastrpc_ioctl_multimode_invoke invoke;
 	u32 nscalars;
+	u64 *perf_kernel;
 	int err, i;
 
 	if (copy_from_user(&invoke, argp, sizeof(invoke)))
@@ -1746,6 +1868,9 @@ static int fastrpc_multimode_invoke(struct fastrpc_user *fl, char __user *argp)
 				return -EFAULT;
 			}
 		}
+		perf_kernel = (u64 *)(uintptr_t)einv.perf_kernel;
+		if (perf_kernel)
+			fl->profile = true;
 		einv.inv.args = (__u64)args;
 		err = fastrpc_internal_invoke(fl, false, &einv);
 		kfree(args);
diff --git a/include/uapi/misc/fastrpc.h b/include/uapi/misc/fastrpc.h
index 45c15be1de58..074675ee646f 100644
--- a/include/uapi/misc/fastrpc.h
+++ b/include/uapi/misc/fastrpc.h
@@ -166,4 +166,18 @@ struct fastrpc_ioctl_capability {
 	__u32 reserved[4];
 };
 
+enum fastrpc_perfkeys {
+	PERF_COUNT = 0,
+	PERF_RESERVED1 = 1,
+	PERF_MAP = 2,
+	PERF_COPY = 3,
+	PERF_LINK = 4,
+	PERF_GETARGS = 5,
+	PERF_PUTARGS = 6,
+	PERF_RESERVED2 = 7,
+	PERF_INVOKE = 8,
+	PERF_RESERVED3 = 9,
+	PERF_KEY_MAX = 10,
+};
+
 #endif /* __QCOM_FASTRPC_H__ */
-- 
2.17.1

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