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Date:      Tue, 03 Sep 2019 14:06:08 -0000
From:      Ilya Bakulin <kibab@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org
Subject:   svn commit: r345776 - head/sys/cam/mmc
Message-ID:  <201904011854.x31IsFKR089317@repo.freebsd.org>
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Author: kibab
Date: Mon Apr  1 18:54:15 2019
New Revision: 345776
URL: https://svnweb.freebsd.org/changeset/base/345776

Log:
  Refactor error handling
  
  There is some code duplication in error handling paths in a few functions.
  Create a function for printing such errors in human-readable way and get rid
  of duplicates.
  
  Approved by:	imp (mentor)
  Differential Revision:	https://reviews.freebsd.org/D15912

Modified:
  head/sys/cam/mmc/mmc_da.c

Modified: head/sys/cam/mmc/mmc_da.c
==============================================================================
--- head/sys/cam/mmc/mmc_da.c	Mon Apr  1 18:49:39 2019	(r345775)
+++ head/sys/cam/mmc/mmc_da.c	Mon Apr  1 18:54:15 2019	(r345776)
@@ -150,6 +150,17 @@ struct sdda_softc {
 	struct timeval log_time;
 };
 
+static const char *mmc_errmsg[] =
+{
+	"None",
+	"Timeout",
+	"Bad CRC",
+	"Fifo",
+	"Failed",
+	"Invalid",
+	"NO MEMORY"
+};
+
 #define ccb_bp		ppriv_ptr1
 
 static	disk_strategy_t	sddastrategy;
@@ -165,6 +176,7 @@ static	void		sddadone(struct cam_periph *periph,
 static  int		sddaerror(union ccb *ccb, u_int32_t cam_flags,
 				u_int32_t sense_flags);
 
+static int mmc_handle_reply(union ccb *ccb);
 static uint16_t get_rca(struct cam_periph *periph);
 static void sdda_start_init(void *context, union ccb *start_ccb);
 static void sdda_start_init_task(void *context, int pending);
@@ -218,6 +230,37 @@ get_rca(struct cam_periph *periph) {
 	return periph->path->device->mmc_ident_data.card_rca;
 }
 
+/*
+ * Figure out if CCB execution resulted in error.
+ * Look at both CAM-level errors and on MMC protocol errors.
+*/
+static int
+mmc_handle_reply(union ccb *ccb)
+{
+
+	KASSERT(ccb->ccb_h.func_code == XPT_MMC_IO,
+	    ("ccb %p: cannot handle non-XPT_MMC_IO errors, got func_code=%d",
+		ccb, ccb->ccb_h.func_code));
+
+	/* TODO: maybe put MMC-specific handling into cam.c/cam_error_print altogether */
+	if (((ccb->ccb_h.status & CAM_STATUS_MASK) == CAM_REQ_CMP)) {
+		if (ccb->mmcio.cmd.error != 0) {
+			xpt_print_path(ccb->ccb_h.path);
+			printf("CMD%d failed, err %d (%s)\n",
+			       ccb->mmcio.cmd.opcode,
+			       ccb->mmcio.cmd.error,
+			       mmc_errmsg[ccb->mmcio.cmd.error]);
+			return (EIO);
+		}
+	} else {
+		cam_error_print(ccb, CAM_ESF_ALL, CAM_EPF_ALL);
+		return (EIO);
+	}
+
+	return (0); /* Normal return */
+}
+
+
 static uint32_t
 mmc_get_bits(uint32_t *bits, int bit_len, int start, int size)
 {
@@ -777,11 +820,12 @@ mmc_exec_app_cmd(struct cam_periph *periph, union ccb 
 		       /*mmc_data*/ NULL,
 		       /*timeout*/ 0);
 
-	err = cam_periph_runccb(ccb, sddaerror, CAM_FLAG_NONE, /*sense_flags*/0, NULL);
+	cam_periph_runccb(ccb, sddaerror, CAM_FLAG_NONE, /*sense_flags*/0, NULL);
+	err = mmc_handle_reply(ccb);
 	if (err != 0)
-		return err;
+		return (err);
 	if (!(ccb->mmcio.cmd.resp[0] & R1_APP_CMD))
-		return MMC_ERR_FAILED;
+		return (EIO);
 
 	/* Now exec actual command */
 	int flags = 0;
@@ -803,12 +847,14 @@ mmc_exec_app_cmd(struct cam_periph *periph, union ccb 
 		       /*mmc_data*/ cmd->data,
 		       /*timeout*/ 0);
 
-	err = cam_periph_runccb(ccb, sddaerror, CAM_FLAG_NONE, /*sense_flags*/0, NULL);
+	cam_periph_runccb(ccb, sddaerror, CAM_FLAG_NONE, /*sense_flags*/0, NULL);
+	err = mmc_handle_reply(ccb);
+	if (err != 0)
+		return (err);
 	memcpy(cmd->resp, ccb->mmcio.cmd.resp, sizeof(cmd->resp));
 	cmd->error = ccb->mmcio.cmd.error;
-	if (err != 0)
-		return err;
-	return 0;
+
+	return (0);
 }
 
 static int
@@ -858,10 +904,9 @@ mmc_send_ext_csd(struct cam_periph *periph, union ccb 
 		       /*mmc_data*/ &d,
 		       /*timeout*/ 0);
 
-	err = cam_periph_runccb(ccb, sddaerror, CAM_FLAG_NONE, /*sense_flags*/0, NULL);
-	if (err != 0)
-		return (err);
-	return (MMC_ERR_NONE);
+	cam_periph_runccb(ccb, sddaerror, CAM_FLAG_NONE, /*sense_flags*/0, NULL);
+	err = mmc_handle_reply(ccb);
+	return (err);
 }
 
 static void
@@ -904,7 +949,7 @@ mmc_switch_fill_mmcio(union ccb *ccb,
 static int
 mmc_select_card(struct cam_periph *periph, union ccb *ccb, uint32_t rca)
 {
-	int flags;
+	int flags, err;
 
 	flags = (rca ? MMC_RSP_R1B : MMC_RSP_NONE) | MMC_CMD_AC;
 	cam_fill_mmcio(&ccb->mmcio,
@@ -918,42 +963,20 @@ mmc_select_card(struct cam_periph *periph, union ccb *
 		       /*timeout*/ 0);
 
 	cam_periph_runccb(ccb, sddaerror, CAM_FLAG_NONE, /*sense_flags*/0, NULL);
-
-	if (((ccb->ccb_h.status & CAM_STATUS_MASK) == CAM_REQ_CMP)) {
-		if (ccb->mmcio.cmd.error != 0) {
-			CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_PERIPH,
-				  ("%s: MMC_SELECT command failed", __func__));
-			return EIO;
-		}
-		return 0; /* Normal return */
-	} else {
-		CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_PERIPH,
-			  ("%s: CAM request failed\n", __func__));
-		return EIO;
-	}
+	err = mmc_handle_reply(ccb);
+	return (err);
 }
 
 static int
 mmc_switch(struct cam_periph *periph, union ccb *ccb,
     uint8_t set, uint8_t index, uint8_t value, u_int timeout)
 {
+	int err;
 
 	mmc_switch_fill_mmcio(ccb, set, index, value, timeout);
 	cam_periph_runccb(ccb, sddaerror, CAM_FLAG_NONE, /*sense_flags*/0, NULL);
-
-	if (((ccb->ccb_h.status & CAM_STATUS_MASK) == CAM_REQ_CMP)) {
-		if (ccb->mmcio.cmd.error != 0) {
-			CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_PERIPH,
-				  ("%s: MMC command failed", __func__));
-			return (EIO);
-		}
-		return (0); /* Normal return */
-	} else {
-		CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_PERIPH,
-			  ("%s: CAM request failed\n", __func__));
-		return (EIO);
-	}
-
+	err = mmc_handle_reply(ccb);
+	return (err);
 }
 
 static uint32_t
@@ -987,6 +1010,7 @@ mmc_sd_switch(struct cam_periph *periph, union ccb *cc
 
 	struct mmc_data mmc_d;
 	uint32_t arg;
+	int err;
 
 	memset(res, 0, 64);
 	mmc_d.len = 64;
@@ -1009,19 +1033,8 @@ mmc_sd_switch(struct cam_periph *periph, union ccb *cc
 		       /*timeout*/ 0);
 
 	cam_periph_runccb(ccb, sddaerror, CAM_FLAG_NONE, /*sense_flags*/0, NULL);
-
-	if (((ccb->ccb_h.status & CAM_STATUS_MASK) == CAM_REQ_CMP)) {
-		if (ccb->mmcio.cmd.error != 0) {
-			CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_PERIPH,
-				  ("%s: MMC command failed", __func__));
-			return EIO;
-		}
-		return 0; /* Normal return */
-	} else {
-		CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_PERIPH,
-			  ("%s: CAM request failed\n", __func__));
-		return EIO;
-	}
+	err = mmc_handle_reply(ccb);
+	return (err);
 }
 
 static int

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