ACPI / APEI: Make hest.c manage the estatus memory pool

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>
Reviewed-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 9 insertions, 1 deletions

diff --git a/drivers/acpi/apei/hest.c b/drivers/acpi/apei/hest.c
index 0935a0ef37e5..e33bfd9d256c 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"
 
@@ -209,6 +210,11 @@ static int __init hest_ghes_dev_register(unsigned int ghes_count)
 	rc = apei_hest_parse(hest_parse_ghes, &ghes_arr);
 	if (rc)
 		goto err;
+
+	rc = ghes_estatus_pool_init();
+	if (rc)
+		goto err;
+
 out:
 	kfree(ghes_arr.ghes_devs);
 	return rc;
@@ -257,7 +263,9 @@ void __init acpi_hest_init(void)
 		rc = apei_hest_parse(hest_parse_ghes_count, &ghes_count);
 		if (rc)
 			goto err;
-		rc = hest_ghes_dev_register(ghes_count);
+
+		if (ghes_count)
+			rc = hest_ghes_dev_register(ghes_count);
 		if (rc)
 			goto err;
 	}