From 8f8027c5f935bf02bdc8806c109ddbb0e402283c Mon Sep 17 00:00:00 2001

From: Al Stone <ahs3@redhat.com>

Date: Wed, 16 May 2018 16:01:41 -0600

Subject: [PATCH] mailbox: PCC: erroneous error message when parsing ACPI PCCT

There have been multiple reports of the following error message:

[    0.068293] Error parsing PCC subspaces from PCCT

This error message is not correct.  In multiple cases examined, the PCCT

(Platform Communications Channel Table) concerned is actually properly

constructed; the problem is that acpi_pcc_probe() which reads the PCCT

is making the assumption that the only valid PCCT is one that contains

subtables of one of two types: ACPI_PCCT_TYPE_HW_REDUCED_SUBSPACE or

ACPI_PCCT_TYPE_HW_REDUCED_TYPE2.  The number of subtables of these

types are counted and as long as there is at least one of the desired

types, the acpi_pcc_probe() succeeds.  When no subtables of these types

are found, regardless of whether or not any other subtable types are

present, the error mentioned above is reported.

In the cases reported to me personally, the PCCT contains exactly one

subtable of type ACPI_PCCT_TYPE_GENERIC_SUBSPACE.  The function

acpi_pcc_probe() does not count it as a valid subtable, so believes

there to be no valid subtables, and hence outputs the error message.

An example of the PCCT being reported as erroneous yet perfectly fine

is the following:

                    Signature : "PCCT"

                 Table Length : 0000006E

                     Revision : 05

                     Checksum : A9

                       Oem ID : "XXXXXX"

                 Oem Table ID : "XXXXX   "

                 Oem Revision : 00002280

              Asl Compiler ID : "XXXX"

        Asl Compiler Revision : 00000002

        Flags (decoded below) : 00000001

                     Platform : 1

                     Reserved : 0000000000000000

                Subtable Type : 00 [Generic Communications Subspace]

                       Length : 3E

                     Reserved : 000000000000

                 Base Address : 00000000DCE43018

               Address Length : 0000000000001000

            Doorbell Register : [Generic Address Structure]

                     Space ID : 01 [SystemIO]

                    Bit Width : 08

                   Bit Offset : 00

         Encoded Access Width : 01 [Byte Access:8]

                      Address : 0000000000001842

                Preserve Mask : 00000000000000FD

                   Write Mask : 0000000000000002

              Command Latency : 00001388

          Maximum Access Rate : 00000000

      Minimum Turnaround Time : 0000

To fix this, we count up all of the possible subtable types for the

PCCT, and only report an error when there are none (which could mean

either no subtables, or no valid subtables), or there are too many.

We also change the logic so that if there is a valid subtable, we

do try to initialize it per the PCCT subtable contents.  This is a

change in functionality; previously, the probe would have returned

right after the error message and would not have tried to use any

other subtable definition.

Tested on my personal laptop which showed the error previously; the

error message no longer appears and the laptop appears to operate

normally.

Signed-off-by: Al Stone <ahs3@redhat.com>

Reviewed-by: Prashanth Prakash <pprakash@codeaurora.org>

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

---

 drivers/mailbox/pcc.c | 81 ++++++++++++++++++++++++---------------------------

 1 file changed, 38 insertions(+), 43 deletions(-)

diff --git a/drivers/mailbox/pcc.c b/drivers/mailbox/pcc.c

index 3ef7f036ceea..fc3c237daef2 100644

--- a/drivers/mailbox/pcc.c

+++ b/drivers/mailbox/pcc.c

@@ -373,33 +373,24 @@ static const struct mbox_chan_ops pcc_chan_ops = {

 };

 /**

- * parse_pcc_subspace - Parse the PCC table and verify PCC subspace

- *		entries. There should be one entry per PCC client.

+ * parse_pcc_subspaces -- Count PCC subspaces defined

  * @header: Pointer to the ACPI subtable header under the PCCT.

  * @end: End of subtable entry.

  *

- * Return: 0 for Success, else errno.

+ * Return: If we find a PCC subspace entry of a valid type, return 0.

+ *	Otherwise, return -EINVAL.

  *

  * This gets called for each entry in the PCC table.

  */

 static int parse_pcc_subspace(struct acpi_subtable_header *header,

 		const unsigned long end)

 {

-	struct acpi_pcct_hw_reduced *pcct_ss;

-

-	if (pcc_mbox_ctrl.num_chans <= MAX_PCC_SUBSPACES) {

-		pcct_ss = (struct acpi_pcct_hw_reduced *) header;

+	struct acpi_pcct_subspace *ss = (struct acpi_pcct_subspace *) header;

-		if ((pcct_ss->header.type !=

-				ACPI_PCCT_TYPE_HW_REDUCED_SUBSPACE)

-		    && (pcct_ss->header.type !=

-				ACPI_PCCT_TYPE_HW_REDUCED_SUBSPACE_TYPE2)) {

-			pr_err("Incorrect PCC Subspace type detected\n");

-			return -EINVAL;

-		}

-	}

+	if (ss->header.type < ACPI_PCCT_TYPE_RESERVED)

+		return 0;

-	return 0;

+	return -EINVAL;

 }

 /**

@@ -449,8 +440,8 @@ static int __init acpi_pcc_probe(void)

 	struct acpi_table_header *pcct_tbl;

 	struct acpi_subtable_header *pcct_entry;

 	struct acpi_table_pcct *acpi_pcct_tbl;

+	struct acpi_subtable_proc proc[ACPI_PCCT_TYPE_RESERVED];

 	int count, i, rc;

-	int sum = 0;

 	acpi_status status = AE_OK;

 	/* Search for PCCT */

@@ -459,43 +450,41 @@ static int __init acpi_pcc_probe(void)

 	if (ACPI_FAILURE(status) || !pcct_tbl)

 		return -ENODEV;

-	count = acpi_table_parse_entries(ACPI_SIG_PCCT,

-			sizeof(struct acpi_table_pcct),

-			ACPI_PCCT_TYPE_HW_REDUCED_SUBSPACE,

-			parse_pcc_subspace, MAX_PCC_SUBSPACES);

-	sum += (count > 0) ? count : 0;

-

-	count = acpi_table_parse_entries(ACPI_SIG_PCCT,

-			sizeof(struct acpi_table_pcct),

-			ACPI_PCCT_TYPE_HW_REDUCED_SUBSPACE_TYPE2,

-			parse_pcc_subspace, MAX_PCC_SUBSPACES);

-	sum += (count > 0) ? count : 0;

+	/* Set up the subtable handlers */

+	for (i = ACPI_PCCT_TYPE_GENERIC_SUBSPACE;

+	     i < ACPI_PCCT_TYPE_RESERVED; i++) {

+		proc[i].id = i;

+		proc[i].count = 0;

+		proc[i].handler = parse_pcc_subspace;

+	}

-	if (sum == 0 || sum >= MAX_PCC_SUBSPACES) {

-		pr_err("Error parsing PCC subspaces from PCCT\n");

+	count = acpi_table_parse_entries_array(ACPI_SIG_PCCT,

+			sizeof(struct acpi_table_pcct), proc,

+			ACPI_PCCT_TYPE_RESERVED, MAX_PCC_SUBSPACES);

+	if (count == 0 || count > MAX_PCC_SUBSPACES) {

+		pr_warn("Invalid PCCT: %d PCC subspaces\n", count);

 		return -EINVAL;

 	}

-	pcc_mbox_channels = kzalloc(sizeof(struct mbox_chan) *

-			sum, GFP_KERNEL);

+	pcc_mbox_channels = kzalloc(sizeof(struct mbox_chan) * count, GFP_KERNEL);

 	if (!pcc_mbox_channels) {

 		pr_err("Could not allocate space for PCC mbox channels\n");

 		return -ENOMEM;

 	}

-	pcc_doorbell_vaddr = kcalloc(sum, sizeof(void *), GFP_KERNEL);

+	pcc_doorbell_vaddr = kcalloc(count, sizeof(void *), GFP_KERNEL);

 	if (!pcc_doorbell_vaddr) {

 		rc = -ENOMEM;

 		goto err_free_mbox;

 	}

-	pcc_doorbell_ack_vaddr = kcalloc(sum, sizeof(void *), GFP_KERNEL);

+	pcc_doorbell_ack_vaddr = kcalloc(count, sizeof(void *), GFP_KERNEL);

 	if (!pcc_doorbell_ack_vaddr) {

 		rc = -ENOMEM;

 		goto err_free_db_vaddr;

 	}

-	pcc_doorbell_irq = kcalloc(sum, sizeof(int), GFP_KERNEL);

+	pcc_doorbell_irq = kcalloc(count, sizeof(int), GFP_KERNEL);

 	if (!pcc_doorbell_irq) {

 		rc = -ENOMEM;

 		goto err_free_db_ack_vaddr;

@@ -509,18 +498,24 @@ static int __init acpi_pcc_probe(void)

 	if (acpi_pcct_tbl->flags & ACPI_PCCT_DOORBELL)

 		pcc_mbox_ctrl.txdone_irq = true;

-	for (i = 0; i < sum; i++) {

+	for (i = 0; i < count; i++) {

 		struct acpi_generic_address *db_reg;

-		struct acpi_pcct_hw_reduced *pcct_ss;

+		struct acpi_pcct_subspace *pcct_ss;

 		pcc_mbox_channels[i].con_priv = pcct_entry;

-		pcct_ss = (struct acpi_pcct_hw_reduced *) pcct_entry;

+		if (pcct_entry->type == ACPI_PCCT_TYPE_HW_REDUCED_SUBSPACE ||

+		    pcct_entry->type == ACPI_PCCT_TYPE_HW_REDUCED_SUBSPACE_TYPE2) {

+			struct acpi_pcct_hw_reduced *pcct_hrss;

+

+			pcct_hrss = (struct acpi_pcct_hw_reduced *) pcct_entry;

-		if (pcc_mbox_ctrl.txdone_irq) {

-			rc = pcc_parse_subspace_irq(i, pcct_ss);

-			if (rc < 0)

-				goto err;

+			if (pcc_mbox_ctrl.txdone_irq) {

+				rc = pcc_parse_subspace_irq(i, pcct_hrss);

+				if (rc < 0)

+					goto err;

+			}

 		}

+		pcct_ss = (struct acpi_pcct_subspace *) pcct_entry;

 		/* If doorbell is in system memory cache the virt address */

 		db_reg = &pcct_ss->doorbell_register;

@@ -531,7 +526,7 @@ static int __init acpi_pcc_probe(void)

 			((unsigned long) pcct_entry + pcct_entry->length);

 	}

-	pcc_mbox_ctrl.num_chans = sum;

+	pcc_mbox_ctrl.num_chans = count;

 	pr_info("Detected %d PCC Subspaces\n", pcc_mbox_ctrl.num_chans);

-- 

2.14.3