From: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Date: Thu, 29 Nov 2018 18:12:28 +0100
Subject: efi: Permit multiple entries in persistent memreserve data structure
Git-commit: 5f0b0ecf043a5319e729c11a53bc8294df12dab3
Patch-mainline: v5.0-rc1
References: bsc#1117158 bsc#1134671
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@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arend van Spriel <arend.vanspriel@broadcom.com>
Cc: Bhupesh Sharma <bhsharma@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Eric Snowberg <eric.snowberg@oracle.com>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Joe Perches <joe@perches.com>
Cc: Jon Hunter <jonathanh@nvidia.com>
Cc: Julien Thierry <julien.thierry@arm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Nathan Chancellor <natechancellor@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>
Cc: Sedat Dilek <sedat.dilek@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: YiFei Zhu <zhuyifei1999@gmail.com>
Cc: linux-efi@vger.kernel.org
Link: http://lkml.kernel.org/r/20181129171230.18699-10-ard.biesheuvel@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Matthias Brugger <mbrugger@suse.com>
---
drivers/firmware/efi/efi.c | 37 ++++++++++++++++++++++----------
drivers/firmware/efi/libstub/arm-stub.c | 2 -
include/linux/efi.h | 13 ++++++++---
3 files changed, 37 insertions(+), 15 deletions(-)
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -577,21 +577,33 @@ int __init efi_apply_persistent_mem_rese
while (prsv) {
struct linux_efi_memreserve *rsv;
+ u8 *p;
+ int i;
- /* reserve the entry itself */
- memblock_reserve(prsv, sizeof(*rsv));
-
- rsv = early_memremap(prsv, sizeof(*rsv));
- if (rsv == NULL) {
+ /*
+ * 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);
}
}
@@ -935,6 +947,7 @@ static int __init efi_memreserve_map_roo
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)
@@ -946,12 +959,14 @@ int __ref efi_mem_reserve_persistent(phy
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;
--- a/drivers/firmware/efi/libstub/arm-stub.c
+++ b/drivers/firmware/efi/libstub/arm-stub.c
@@ -111,8 +111,8 @@ void install_memreserve_table(efi_system
}
rsv->next = 0;
- rsv->base = 0;
rsv->size = 0;
+ atomic_set(&rsv->count, 0);
status = efi_call_early(install_configuration_table,
&memreserve_table_guid,
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -1590,9 +1590,16 @@ struct linux_efi_random_seed {
};
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 */