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Message-ID: <tip-5f0b0ecf043a5319e729c11a53bc8294df12dab3@git.kernel.org>
Date: Fri, 30 Nov 2018 02:00:22 -0800
From: tip-bot for Ard Biesheuvel <tipbot@...or.com>
To: linux-tip-commits@...r.kernel.org
Cc: natechancellor@...il.com, arend.vanspriel@...adcom.com,
hdegoede@...hat.com, marc.zyngier@....com,
matt@...eblueprint.co.uk, sedat.dilek@...il.com,
sai.praneeth.prakhya@...el.com, peterz@...radead.org,
julien.thierry@....com, zhuyifei1999@...il.com, luto@...nel.org,
ard.biesheuvel@...aro.org, jonathanh@...dia.com, bp@...en8.de,
dave.hansen@...el.com, linux-kernel@...r.kernel.org,
joe@...ches.com, tglx@...utronix.de, bhsharma@...hat.com,
eric.snowberg@...cle.com, torvalds@...ux-foundation.org,
mingo@...nel.org, hpa@...or.com
Subject: [tip:efi/core] efi: Permit multiple entries in persistent
memreserve data structure
Commit-ID: 5f0b0ecf043a5319e729c11a53bc8294df12dab3
Gitweb: https://git.kernel.org/tip/5f0b0ecf043a5319e729c11a53bc8294df12dab3
Author: Ard Biesheuvel <ard.biesheuvel@...aro.org>
AuthorDate: Thu, 29 Nov 2018 18:12:28 +0100
Committer: Ingo Molnar <mingo@...nel.org>
CommitDate: Fri, 30 Nov 2018 09:10:31 +0100
efi: Permit multiple entries in persistent memreserve data structure
In preparation of updating efi_mem_reserve_persistent() to cause less
fragmentation when dealing with many persistent reservations, update
the struct definition and the code that handles it currently so it
can describe an arbitrary number of reservations using a single linked
list entry. The actual optimization will be implemented in a subsequent
patch.
Tested-by: Marc Zyngier <marc.zyngier@....com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Arend van Spriel <arend.vanspriel@...adcom.com>
Cc: Bhupesh Sharma <bhsharma@...hat.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Dave Hansen <dave.hansen@...el.com>
Cc: Eric Snowberg <eric.snowberg@...cle.com>
Cc: Hans de Goede <hdegoede@...hat.com>
Cc: Joe Perches <joe@...ches.com>
Cc: Jon Hunter <jonathanh@...dia.com>
Cc: Julien Thierry <julien.thierry@....com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Matt Fleming <matt@...eblueprint.co.uk>
Cc: Nathan Chancellor <natechancellor@...il.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Sai Praneeth Prakhya <sai.praneeth.prakhya@...el.com>
Cc: Sedat Dilek <sedat.dilek@...il.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: YiFei Zhu <zhuyifei1999@...il.com>
Cc: linux-efi@...r.kernel.org
Link: http://lkml.kernel.org/r/20181129171230.18699-10-ard.biesheuvel@linaro.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
drivers/firmware/efi/efi.c | 39 +++++++++++++++++++++++----------
drivers/firmware/efi/libstub/arm-stub.c | 2 +-
include/linux/efi.h | 13 ++++++++---
3 files changed, 38 insertions(+), 16 deletions(-)
diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index 415849bab233..80b11521627a 100644
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -602,21 +602,33 @@ int __init efi_apply_persistent_mem_reservations(void)
while (prsv) {
struct linux_efi_memreserve *rsv;
-
- /* reserve the entry itself */
- memblock_reserve(prsv, sizeof(*rsv));
-
- rsv = early_memremap(prsv, sizeof(*rsv));
- if (rsv == NULL) {
+ u8 *p;
+ int i;
+
+ /*
+ * Just map a full page: that is what we will get
+ * anyway, and it permits us to map the entire entry
+ * before knowing its size.
+ */
+ p = early_memremap(ALIGN_DOWN(prsv, PAGE_SIZE),
+ PAGE_SIZE);
+ if (p == NULL) {
pr_err("Could not map UEFI memreserve entry!\n");
return -ENOMEM;
}
- if (rsv->size)
- memblock_reserve(rsv->base, rsv->size);
+ rsv = (void *)(p + prsv % PAGE_SIZE);
+
+ /* reserve the entry itself */
+ memblock_reserve(prsv, EFI_MEMRESERVE_SIZE(rsv->size));
+
+ for (i = 0; i < atomic_read(&rsv->count); i++) {
+ memblock_reserve(rsv->entry[i].base,
+ rsv->entry[i].size);
+ }
prsv = rsv->next;
- early_memunmap(rsv, sizeof(*rsv));
+ early_memunmap(p, PAGE_SIZE);
}
}
@@ -985,6 +997,7 @@ static int __init efi_memreserve_map_root(void)
int __ref efi_mem_reserve_persistent(phys_addr_t addr, u64 size)
{
struct linux_efi_memreserve *rsv;
+ int rsvsize = EFI_MEMRESERVE_SIZE(1);
int rc;
if (efi_memreserve_root == (void *)ULONG_MAX)
@@ -996,12 +1009,14 @@ int __ref efi_mem_reserve_persistent(phys_addr_t addr, u64 size)
return rc;
}
- rsv = kmalloc(sizeof(*rsv), GFP_ATOMIC);
+ rsv = kmalloc(rsvsize, GFP_ATOMIC);
if (!rsv)
return -ENOMEM;
- rsv->base = addr;
- rsv->size = size;
+ rsv->size = 1;
+ atomic_set(&rsv->count, 1);
+ rsv->entry[0].base = addr;
+ rsv->entry[0].size = size;
spin_lock(&efi_mem_reserve_persistent_lock);
rsv->next = efi_memreserve_root->next;
diff --git a/drivers/firmware/efi/libstub/arm-stub.c b/drivers/firmware/efi/libstub/arm-stub.c
index 3d36142cf812..9e20159ea5f5 100644
--- a/drivers/firmware/efi/libstub/arm-stub.c
+++ b/drivers/firmware/efi/libstub/arm-stub.c
@@ -86,8 +86,8 @@ void install_memreserve_table(efi_system_table_t *sys_table_arg)
}
rsv->next = 0;
- rsv->base = 0;
rsv->size = 0;
+ atomic_set(&rsv->count, 0);
status = efi_call_early(install_configuration_table,
&memreserve_table_guid,
diff --git a/include/linux/efi.h b/include/linux/efi.h
index 2b3b33c83b05..4f27640fdcdc 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -1712,9 +1712,16 @@ extern struct efi_runtime_work efi_rts_work;
extern struct workqueue_struct *efi_rts_wq;
struct linux_efi_memreserve {
- phys_addr_t next;
- phys_addr_t base;
- phys_addr_t size;
+ int size; // allocated size of the array
+ atomic_t count; // number of entries used
+ phys_addr_t next; // pa of next struct instance
+ struct {
+ phys_addr_t base;
+ phys_addr_t size;
+ } entry[0];
};
+#define EFI_MEMRESERVE_SIZE(count) (sizeof(struct linux_efi_memreserve) + \
+ (count) * sizeof(((struct linux_efi_memreserve *)0)->entry[0]))
+
#endif /* _LINUX_EFI_H */
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