mirror of
https://github.com/FEX-Emu/linux.git
synced 2025-01-12 20:31:49 +00:00
871b72dd1e
* Solve issues described in 6f66cbc63081fd70e3191b4dbb796746780e5ae1
in a way that doesn't resort to set_cpus_allowed();
* in fact, only collect_cpu_info and apply_microcode callbacks
must run on a target cpu, others will do just fine on any other.
smp_call_function_single() (as suggested by Ingo) is used to run
these callbacks on a target cpu.
* cleanup of synchronization logic of the 'microcode_core' part
The generic 'microcode_core' part guarantees that only a single cpu
(be it a full-fledged cpu, one of the cores or HT)
is being updated at any particular moment of time.
In general, there is no need for any additional sync. mechanism in
arch-specific parts (the patch removes existing spinlocks).
See also the "Synchronization" section in microcode_core.c.
* return -EINVAL instead of -1 (which is translated into -EPERM) in
microcode_write(), reload_cpu() and mc_sysdev_add(). Other suggestions
for an error code?
* use 'enum ucode_state' as return value of request_microcode_{fw, user}
to gain more flexibility by distinguishing between real error cases
and situations when an appropriate ucode was not found (which is not an
error per-se).
* some minor cleanups
Thanks a lot to Hugh Dickins for review/suggestions/testing!
Reference: http://marc.info/?l=linux-kernel&m=124025889012541&w=2
[ Impact: refactor and clean up microcode driver locking code ]
Signed-off-by: Dmitry Adamushko <dmitry.adamushko@gmail.com>
Acked-by: Hugh Dickins <hugh@veritas.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Andreas Herrmann <andreas.herrmann3@amd.com>
Cc: Peter Oruba <peter.oruba@amd.com>
Cc: Arjan van de Ven <arjan@infradead.org>
LKML-Reference: <1242078507.5560.9.camel@earth>
[ did some more cleanups ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
arch/x86/include/asm/microcode.h | 25 ++
arch/x86/kernel/microcode_amd.c | 58 ++----
arch/x86/kernel/microcode_core.c | 326 +++++++++++++++++++++-----------------
arch/x86/kernel/microcode_intel.c | 92 +++-------
4 files changed, 261 insertions(+), 240 deletions(-)
(~20 new comment lines)
59 lines
1.3 KiB
C
59 lines
1.3 KiB
C
#ifndef _ASM_X86_MICROCODE_H
|
|
#define _ASM_X86_MICROCODE_H
|
|
|
|
struct cpu_signature {
|
|
unsigned int sig;
|
|
unsigned int pf;
|
|
unsigned int rev;
|
|
};
|
|
|
|
struct device;
|
|
|
|
enum ucode_state { UCODE_ERROR, UCODE_OK, UCODE_NFOUND };
|
|
|
|
struct microcode_ops {
|
|
enum ucode_state (*request_microcode_user) (int cpu,
|
|
const void __user *buf, size_t size);
|
|
|
|
enum ucode_state (*request_microcode_fw) (int cpu,
|
|
struct device *device);
|
|
|
|
void (*microcode_fini_cpu) (int cpu);
|
|
|
|
/*
|
|
* The generic 'microcode_core' part guarantees that
|
|
* the callbacks below run on a target cpu when they
|
|
* are being called.
|
|
* See also the "Synchronization" section in microcode_core.c.
|
|
*/
|
|
int (*apply_microcode) (int cpu);
|
|
int (*collect_cpu_info) (int cpu, struct cpu_signature *csig);
|
|
};
|
|
|
|
struct ucode_cpu_info {
|
|
struct cpu_signature cpu_sig;
|
|
int valid;
|
|
void *mc;
|
|
};
|
|
extern struct ucode_cpu_info ucode_cpu_info[];
|
|
|
|
#ifdef CONFIG_MICROCODE_INTEL
|
|
extern struct microcode_ops * __init init_intel_microcode(void);
|
|
#else
|
|
static inline struct microcode_ops * __init init_intel_microcode(void)
|
|
{
|
|
return NULL;
|
|
}
|
|
#endif /* CONFIG_MICROCODE_INTEL */
|
|
|
|
#ifdef CONFIG_MICROCODE_AMD
|
|
extern struct microcode_ops * __init init_amd_microcode(void);
|
|
#else
|
|
static inline struct microcode_ops * __init init_amd_microcode(void)
|
|
{
|
|
return NULL;
|
|
}
|
|
#endif
|
|
|
|
#endif /* _ASM_X86_MICROCODE_H */
|