[PATCH v7 04/25] ACPI / APEI: Make hest.c manage the estatus memory pool

James Morse
2018-12-03T18:06:52Z

ghes.c has a memory pool it uses for the estatus cache and the estatus
queue. The cache is initialised when registering the platform driver.
For the queue, an NMI-like notification has to grow/shrink the pool
as it is registered and unregistered.

This is all pretty noisy when adding new NMI-like notifications, it
would be better to replace this with a static pool size based on the
number of users.

As a precursor, move the call that creates the pool from ghes_init(),
into hest.c. Later this will take the number of ghes entries and
consolidate the queue allocations.
Remove ghes_estatus_pool_exit() as hest.c doesn't have anywhere to put
this.

The pool is now initialised as part of ACPI's subsys_initcall():
(acpi_init(), acpi_scan_init(), acpi_pci_root_init(), acpi_hest_init())
Before this patch it happened later as a GHES specific device_initcall().

Signed-off-by: James Morse <james.morse@arm.com>
---
drivers/acpi/apei/ghes.c | 33 ++++++---------------------------
drivers/acpi/apei/hest.c | 5 +++++
include/acpi/ghes.h | 2 ++
3 files changed, 13 insertions(+), 27 deletions(-)

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index c15264f2dc4b..78058adb2574 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -162,26 +162,16 @@ static void ghes_iounmap_irq(void)
clear_fixmap(FIX_APEI_GHES_IRQ);
}

-static int ghes_estatus_pool_init(void)
+static int ghes_estatus_pool_expand(unsigned long len); //temporary
+
+int ghes_estatus_pool_init(void)
{
ghes_estatus_pool = gen_pool_create(GHES_ESTATUS_POOL_MIN_ALLOC_ORDER, -1);
if (!ghes_estatus_pool)
return -ENOMEM;
- return 0;
-}

-static void ghes_estatus_pool_free_chunk(struct gen_pool *pool,
- struct gen_pool_chunk *chunk,
- void *data)
-{
- vfree((void *)chunk->start_addr);
-}
-
-static void ghes_estatus_pool_exit(void)
-{
- gen_pool_for_each_chunk(ghes_estatus_pool,
- ghes_estatus_pool_free_chunk, NULL);
- gen_pool_destroy(ghes_estatus_pool);
+ return ghes_estatus_pool_expand(GHES_ESTATUS_CACHE_AVG_SIZE *
+ GHES_ESTATUS_CACHE_ALLOCED_MAX);
}

static int ghes_estatus_pool_expand(unsigned long len)
@@ -1225,18 +1215,9 @@ static int __init ghes_init(void)

ghes_nmi_init_cxt();

- rc = ghes_estatus_pool_init();
- if (rc)
- goto err;
-
- rc = ghes_estatus_pool_expand(GHES_ESTATUS_CACHE_AVG_SIZE *
- GHES_ESTATUS_CACHE_ALLOCED_MAX);
- if (rc)
- goto err_pool_exit;
-
rc = platform_driver_register(&ghes_platform_driver);
if (rc)
- goto err_pool_exit;
+ goto err;

rc = apei_osc_setup();
if (rc == 0 && osc_sb_apei_support_acked)
@@ -1249,8 +1230,6 @@ static int __init ghes_init(void)
pr_info(GHES_PFX "Failed to enable APEI firmware first mode.\n");

return 0;
-err_pool_exit:
- ghes_estatus_pool_exit();
err:
return rc;
}
diff --git a/drivers/acpi/apei/hest.c b/drivers/acpi/apei/hest.c
index b1e9f81ebeea..da5fabaeb48f 100644
--- a/drivers/acpi/apei/hest.c
+++ b/drivers/acpi/apei/hest.c
@@ -32,6 +32,7 @@
#include <linux/io.h>
#include <linux/platform_device.h>
#include <acpi/apei.h>
+#include <acpi/ghes.h>

#include "apei-internal.h"

@@ -200,6 +201,10 @@ static int __init hest_ghes_dev_register(unsigned int ghes_count)
if (!ghes_arr.ghes_devs)
return -ENOMEM;

+ rc = ghes_estatus_pool_init();
+ if (rc)
+ goto out;
+
rc = apei_hest_parse(hest_parse_ghes, &ghes_arr);
if (rc)
goto err;
diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
index 82cb4eb225a4..46ef5566e052 100644
--- a/include/acpi/ghes.h
+++ b/include/acpi/ghes.h
@@ -52,6 +52,8 @@ enum {
GHES_SEV_PANIC = 0x3,
};

+int ghes_estatus_pool_init(void);
+
/* From drivers/edac/ghes_edac.c */

#ifdef CONFIG_EDAC_GHES
--
2.19.2