Patchwork acpi: mcfg: move PCI mmap and munmap to compare_config_space

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Submitter Colin King
Date Feb. 20, 2013, 1:15 p.m.
Message ID <1361366107-12482-1-git-send-email-colin.king@canonical.com>
Download mbox | patch
Permalink /patch/222079/
State Accepted
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Comments

Colin King - Feb. 20, 2013, 1:15 p.m.
From: Colin Ian King <colin.king@canonical.com>

Move the memory mapping and unmapping to compare_config_space
and add error returns to compare_config_space.  This works around
a bug we found in a Xen dom0 where the fork/exec trips a bug
where the kernel reports:

fwts:2737 map pfn expected mapping type write-back for [mem 0xe0000000-0xe0000fff], got uncached-minus

..the workaround for the moment is to do the mmap, read the data
and then a munmap before we do a fork/exec.   This tidies the code anyhow
as we keep the mapping for a minimal amount of time.

The kernel bug may be related to commit 8eaffa67b43e99ae581622c5133e20b0f48bcef1

Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 src/acpi/mcfg/mcfg.c | 39 ++++++++++++++++++++-------------------
 1 file changed, 20 insertions(+), 19 deletions(-)
Alex Hung - March 4, 2013, 8:45 a.m.
On 02/20/2013 09:15 PM, Colin King wrote:
> From: Colin Ian King <colin.king@canonical.com>
>
> Move the memory mapping and unmapping to compare_config_space
> and add error returns to compare_config_space.  This works around
> a bug we found in a Xen dom0 where the fork/exec trips a bug
> where the kernel reports:
>
> fwts:2737 map pfn expected mapping type write-back for [mem 0xe0000000-0xe0000fff], got uncached-minus
>
> ..the workaround for the moment is to do the mmap, read the data
> and then a munmap before we do a fork/exec.   This tidies the code anyhow
> as we keep the mapping for a minimal amount of time.
>
> The kernel bug may be related to commit 8eaffa67b43e99ae581622c5133e20b0f48bcef1
>
> Signed-off-by: Colin Ian King <colin.king@canonical.com>
> ---
>   src/acpi/mcfg/mcfg.c | 39 ++++++++++++++++++++-------------------
>   1 file changed, 20 insertions(+), 19 deletions(-)
>
> diff --git a/src/acpi/mcfg/mcfg.c b/src/acpi/mcfg/mcfg.c
> index 29538db..0359585 100644
> --- a/src/acpi/mcfg/mcfg.c
> +++ b/src/acpi/mcfg/mcfg.c
> @@ -32,19 +32,29 @@
>   static fwts_list *memory_map_list;
>   static fwts_acpi_table_info *mcfg_table;
>
> -static void compare_config_space(
> +static int compare_config_space(
>   	fwts_framework *fw,
>   	const uint16_t segment,
>   	const uint32_t device,
> -	const uint8_t *space)
> +	fwts_acpi_mcfg_configuration *config)
>   {
>   	fwts_list *lspci_output;
>   	fwts_list_link *item;
>   	int status;
> +	uint8_t *space;
> +	size_t page_size;
>
>   	char command[PATH_MAX];
>   	char compare_line[50];
>
> +	page_size = fwts_page_size();
> +
> +	/* Sanity check on first config */
> +	if ((space = fwts_mmap(config->base_address, page_size)) == FWTS_MAP_FAILED) {
> +		fwts_log_error(fw, "Cannot mmap table at 0x%" PRIx64 ".", config->base_address);
> +		return FWTS_ERROR;
> +	}
> +
>   	snprintf(compare_line, sizeof(compare_line),
>   		"%02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x",
>   		space[0],  space[1],  space[2],  space[3],
> @@ -52,19 +62,21 @@ static void compare_config_space(
>   		space[8],  space[9],  space[10], space[11],
>   		space[12], space[13], space[14], space[15]);
>
> +	(void)fwts_munmap(space, page_size);
> +
>   	snprintf(command, sizeof(command), "%s -vxxx -s %" PRIu16 ":%" PRIu32,
>   		fw->lspci, segment, device);
>
>   	if (fwts_pipe_exec(command, &lspci_output, &status) != FWTS_OK) {
>   		fwts_log_warning(fw, "Could not execute %s", command);
> -		return;
> +		return FWTS_ERROR;
>   	}
>
>   	if (lspci_output == NULL) {
>   		fwts_log_warning(fw,
>   			"Failed to get lspci info for %" PRIu16 ":%" PRIu32,
>   			segment, device);
> -		return;
> +		return FWTS_ERROR;
>   	}
>
>   	fwts_list_foreach(item, lspci_output) {
> @@ -84,11 +96,13 @@ static void compare_config_space(
>   				fwts_passed(fw, "PCI config space verified.");
>
>   			fwts_text_list_free(lspci_output);
> -			return;
> +			return FWTS_OK;
>   		}
>   	}
>   	fwts_text_list_free(lspci_output);
>   	fwts_log_warning(fw, "Possible PCI space config space defect?");
> +
> +	return FWTS_ERROR;
>   }
>
>   static int mcfg_init(fwts_framework *fw)
> @@ -228,7 +242,6 @@ static int mcfg_test1(fwts_framework *fw)
>   	if (!failed)
>   		fwts_passed(fw, "MCFG mmio config space is reserved in memory map table.");
>
> -
>   	return FWTS_OK;
>   }
>
> @@ -239,10 +252,6 @@ static int mcfg_test2(fwts_framework *fw)
>   {
>   	fwts_acpi_table_mcfg *mcfg = (fwts_acpi_table_mcfg *)mcfg_table->data;
>   	fwts_acpi_mcfg_configuration *config;
> -	uint8_t *mapped_table_page;
> -	size_t page_size;
> -
> -	page_size = fwts_page_size();
>
>   	if (mcfg == NULL) {
>   		fwts_failed(fw, LOG_LEVEL_HIGH, "MCFGInvalidTable",
> @@ -260,15 +269,7 @@ static int mcfg_test2(fwts_framework *fw)
>
>   	config = &mcfg->configuration[0];
>
> -	/* Sanity check on first config */
> -	if ((mapped_table_page = fwts_mmap(config->base_address, page_size)) == FWTS_MAP_FAILED) {
> -		fwts_log_error(fw, "Cannot mmap table at 0x%" PRIx64 ".", config->base_address);
> -		return FWTS_ERROR;
> -	}
> -	compare_config_space(fw, config->pci_segment_group_number, 0, mapped_table_page);
> -	fwts_munmap(mapped_table_page, page_size);
> -
> -	return FWTS_OK;
> +	return compare_config_space(fw, config->pci_segment_group_number, 0, config);
>   }
>
>   static fwts_framework_minor_test mcfg_tests[] = {
>
Acked-by: Alex Hung <alex.hung@canonical.com>
Keng-Yu Lin - March 5, 2013, 5:42 a.m.
On Wed, Feb 20, 2013 at 9:15 PM, Colin King <colin.king@canonical.com> wrote:
> From: Colin Ian King <colin.king@canonical.com>
>
> Move the memory mapping and unmapping to compare_config_space
> and add error returns to compare_config_space.  This works around
> a bug we found in a Xen dom0 where the fork/exec trips a bug
> where the kernel reports:
>
> fwts:2737 map pfn expected mapping type write-back for [mem 0xe0000000-0xe0000fff], got uncached-minus
>
> ..the workaround for the moment is to do the mmap, read the data
> and then a munmap before we do a fork/exec.   This tidies the code anyhow
> as we keep the mapping for a minimal amount of time.
>
> The kernel bug may be related to commit 8eaffa67b43e99ae581622c5133e20b0f48bcef1
>
> Signed-off-by: Colin Ian King <colin.king@canonical.com>
> ---
>  src/acpi/mcfg/mcfg.c | 39 ++++++++++++++++++++-------------------
>  1 file changed, 20 insertions(+), 19 deletions(-)
>
> diff --git a/src/acpi/mcfg/mcfg.c b/src/acpi/mcfg/mcfg.c
> index 29538db..0359585 100644
> --- a/src/acpi/mcfg/mcfg.c
> +++ b/src/acpi/mcfg/mcfg.c
> @@ -32,19 +32,29 @@
>  static fwts_list *memory_map_list;
>  static fwts_acpi_table_info *mcfg_table;
>
> -static void compare_config_space(
> +static int compare_config_space(
>         fwts_framework *fw,
>         const uint16_t segment,
>         const uint32_t device,
> -       const uint8_t *space)
> +       fwts_acpi_mcfg_configuration *config)
>  {
>         fwts_list *lspci_output;
>         fwts_list_link *item;
>         int status;
> +       uint8_t *space;
> +       size_t page_size;
>
>         char command[PATH_MAX];
>         char compare_line[50];
>
> +       page_size = fwts_page_size();
> +
> +       /* Sanity check on first config */
> +       if ((space = fwts_mmap(config->base_address, page_size)) == FWTS_MAP_FAILED) {
> +               fwts_log_error(fw, "Cannot mmap table at 0x%" PRIx64 ".", config->base_address);
> +               return FWTS_ERROR;
> +       }
> +
>         snprintf(compare_line, sizeof(compare_line),
>                 "%02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x",
>                 space[0],  space[1],  space[2],  space[3],
> @@ -52,19 +62,21 @@ static void compare_config_space(
>                 space[8],  space[9],  space[10], space[11],
>                 space[12], space[13], space[14], space[15]);
>
> +       (void)fwts_munmap(space, page_size);
> +
>         snprintf(command, sizeof(command), "%s -vxxx -s %" PRIu16 ":%" PRIu32,
>                 fw->lspci, segment, device);
>
>         if (fwts_pipe_exec(command, &lspci_output, &status) != FWTS_OK) {
>                 fwts_log_warning(fw, "Could not execute %s", command);
> -               return;
> +               return FWTS_ERROR;
>         }
>
>         if (lspci_output == NULL) {
>                 fwts_log_warning(fw,
>                         "Failed to get lspci info for %" PRIu16 ":%" PRIu32,
>                         segment, device);
> -               return;
> +               return FWTS_ERROR;
>         }
>
>         fwts_list_foreach(item, lspci_output) {
> @@ -84,11 +96,13 @@ static void compare_config_space(
>                                 fwts_passed(fw, "PCI config space verified.");
>
>                         fwts_text_list_free(lspci_output);
> -                       return;
> +                       return FWTS_OK;
>                 }
>         }
>         fwts_text_list_free(lspci_output);
>         fwts_log_warning(fw, "Possible PCI space config space defect?");
> +
> +       return FWTS_ERROR;
>  }
>
>  static int mcfg_init(fwts_framework *fw)
> @@ -228,7 +242,6 @@ static int mcfg_test1(fwts_framework *fw)
>         if (!failed)
>                 fwts_passed(fw, "MCFG mmio config space is reserved in memory map table.");
>
> -
>         return FWTS_OK;
>  }
>
> @@ -239,10 +252,6 @@ static int mcfg_test2(fwts_framework *fw)
>  {
>         fwts_acpi_table_mcfg *mcfg = (fwts_acpi_table_mcfg *)mcfg_table->data;
>         fwts_acpi_mcfg_configuration *config;
> -       uint8_t *mapped_table_page;
> -       size_t page_size;
> -
> -       page_size = fwts_page_size();
>
>         if (mcfg == NULL) {
>                 fwts_failed(fw, LOG_LEVEL_HIGH, "MCFGInvalidTable",
> @@ -260,15 +269,7 @@ static int mcfg_test2(fwts_framework *fw)
>
>         config = &mcfg->configuration[0];
>
> -       /* Sanity check on first config */
> -       if ((mapped_table_page = fwts_mmap(config->base_address, page_size)) == FWTS_MAP_FAILED) {
> -               fwts_log_error(fw, "Cannot mmap table at 0x%" PRIx64 ".", config->base_address);
> -               return FWTS_ERROR;
> -       }
> -       compare_config_space(fw, config->pci_segment_group_number, 0, mapped_table_page);
> -       fwts_munmap(mapped_table_page, page_size);
> -
> -       return FWTS_OK;
> +       return compare_config_space(fw, config->pci_segment_group_number, 0, config);
>  }
>
>  static fwts_framework_minor_test mcfg_tests[] = {
> --
> 1.8.1.2
>
Acked-by: Keng-Yu Lin <kengyu@canonical.com>

Patch

diff --git a/src/acpi/mcfg/mcfg.c b/src/acpi/mcfg/mcfg.c
index 29538db..0359585 100644
--- a/src/acpi/mcfg/mcfg.c
+++ b/src/acpi/mcfg/mcfg.c
@@ -32,19 +32,29 @@ 
 static fwts_list *memory_map_list;
 static fwts_acpi_table_info *mcfg_table;
 
-static void compare_config_space(
+static int compare_config_space(
 	fwts_framework *fw,
 	const uint16_t segment,
 	const uint32_t device,
-	const uint8_t *space)
+	fwts_acpi_mcfg_configuration *config)
 {
 	fwts_list *lspci_output;
 	fwts_list_link *item;
 	int status;
+	uint8_t *space;
+	size_t page_size;
 
 	char command[PATH_MAX];
 	char compare_line[50];
 
+	page_size = fwts_page_size();
+
+	/* Sanity check on first config */
+	if ((space = fwts_mmap(config->base_address, page_size)) == FWTS_MAP_FAILED) {
+		fwts_log_error(fw, "Cannot mmap table at 0x%" PRIx64 ".", config->base_address);
+		return FWTS_ERROR;
+	}
+
 	snprintf(compare_line, sizeof(compare_line),
 		"%02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x",
 		space[0],  space[1],  space[2],  space[3],
@@ -52,19 +62,21 @@  static void compare_config_space(
 		space[8],  space[9],  space[10], space[11],
 		space[12], space[13], space[14], space[15]);
 
+	(void)fwts_munmap(space, page_size);
+
 	snprintf(command, sizeof(command), "%s -vxxx -s %" PRIu16 ":%" PRIu32,
 		fw->lspci, segment, device);
 
 	if (fwts_pipe_exec(command, &lspci_output, &status) != FWTS_OK) {
 		fwts_log_warning(fw, "Could not execute %s", command);
-		return;
+		return FWTS_ERROR;
 	}
 
 	if (lspci_output == NULL) {
 		fwts_log_warning(fw,
 			"Failed to get lspci info for %" PRIu16 ":%" PRIu32,
 			segment, device);
-		return;
+		return FWTS_ERROR;
 	}
 
 	fwts_list_foreach(item, lspci_output) {
@@ -84,11 +96,13 @@  static void compare_config_space(
 				fwts_passed(fw, "PCI config space verified.");
 
 			fwts_text_list_free(lspci_output);
-			return;
+			return FWTS_OK;
 		}
 	}
 	fwts_text_list_free(lspci_output);
 	fwts_log_warning(fw, "Possible PCI space config space defect?");
+
+	return FWTS_ERROR;
 }
 
 static int mcfg_init(fwts_framework *fw)
@@ -228,7 +242,6 @@  static int mcfg_test1(fwts_framework *fw)
 	if (!failed)
 		fwts_passed(fw, "MCFG mmio config space is reserved in memory map table.");
 
-
 	return FWTS_OK;
 }
 
@@ -239,10 +252,6 @@  static int mcfg_test2(fwts_framework *fw)
 {
 	fwts_acpi_table_mcfg *mcfg = (fwts_acpi_table_mcfg *)mcfg_table->data;
 	fwts_acpi_mcfg_configuration *config;
-	uint8_t *mapped_table_page;
-	size_t page_size;
-
-	page_size = fwts_page_size();
 
 	if (mcfg == NULL) {
 		fwts_failed(fw, LOG_LEVEL_HIGH, "MCFGInvalidTable",
@@ -260,15 +269,7 @@  static int mcfg_test2(fwts_framework *fw)
 
 	config = &mcfg->configuration[0];
 
-	/* Sanity check on first config */
-	if ((mapped_table_page = fwts_mmap(config->base_address, page_size)) == FWTS_MAP_FAILED) {
-		fwts_log_error(fw, "Cannot mmap table at 0x%" PRIx64 ".", config->base_address);
-		return FWTS_ERROR;
-	}
-	compare_config_space(fw, config->pci_segment_group_number, 0, mapped_table_page);
-	fwts_munmap(mapped_table_page, page_size);
-
-	return FWTS_OK;
+	return compare_config_space(fw, config->pci_segment_group_number, 0, config);
 }
 
 static fwts_framework_minor_test mcfg_tests[] = {