x86: Move kernel_fpu_using to irq_fpu_usable in asm/i387.h

This function measures whether the FPU/SSE state can be touched in
interrupt context. If the interrupted code is in user space or has no
valid FPU/SSE context (CR0.TS == 1), FPU/SSE state can be used in IRQ
or soft_irq context too.

This is used by AES-NI accelerated AES implementation and PCLMULQDQ
accelerated GHASH implementation.

v3:
 - Renamed to irq_fpu_usable to reflect the purpose of the function.

v2:
 - Renamed to irq_is_fpu_using to reflect the real situation.

Signed-off-by: Huang Ying <ying.huang@intel.com>
CC: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

diff --git a/arch/x86/crypto/aesni-intel_glue.c b/arch/x86/crypto/aesni-intel_glue.c
index c580c5e..7667235 100644 (file)
--- a/arch/x86/crypto/aesni-intel_glue.c
+++ b/arch/x86/crypto/aesni-intel_glue.c
@@ -59,13 +59,6 @@ asmlinkage void aesni_cbc_enc(struct crypto_aes_ctx *ctx, u8 *out,
 asmlinkage void aesni_cbc_dec(struct crypto_aes_ctx *ctx, u8 *out,
                              const u8 *in, unsigned int len, u8 *iv);
 
-static inline int kernel_fpu_using(void)
-{
-       if (in_interrupt() && !(read_cr0() & X86_CR0_TS))
-               return 1;
-       return 0;
-}
-
 static inline struct crypto_aes_ctx *aes_ctx(void *raw_ctx)
 {
        unsigned long addr = (unsigned long)raw_ctx;
@@ -89,7 +82,7 @@ static int aes_set_key_common(struct crypto_tfm *tfm, void *raw_ctx,
                return -EINVAL;
        }
 
-       if (kernel_fpu_using())
+       if (irq_fpu_usable())
                err = crypto_aes_expand_key(ctx, in_key, key_len);
        else {
                kernel_fpu_begin();
@@ -110,7 +103,7 @@ static void aes_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
 {
        struct crypto_aes_ctx *ctx = aes_ctx(crypto_tfm_ctx(tfm));
 
-       if (kernel_fpu_using())
+       if (irq_fpu_usable())
                crypto_aes_encrypt_x86(ctx, dst, src);
        else {
                kernel_fpu_begin();
@@ -123,7 +116,7 @@ static void aes_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
 {
        struct crypto_aes_ctx *ctx = aes_ctx(crypto_tfm_ctx(tfm));
 
-       if (kernel_fpu_using())
+       if (irq_fpu_usable())
                crypto_aes_decrypt_x86(ctx, dst, src);
        else {
                kernel_fpu_begin();
@@ -349,7 +342,7 @@ static int ablk_encrypt(struct ablkcipher_request *req)
        struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
        struct async_aes_ctx *ctx = crypto_ablkcipher_ctx(tfm);
 
-       if (kernel_fpu_using()) {
+       if (irq_fpu_usable()) {
                struct ablkcipher_request *cryptd_req =
                        ablkcipher_request_ctx(req);
                memcpy(cryptd_req, req, sizeof(*req));
@@ -370,7 +363,7 @@ static int ablk_decrypt(struct ablkcipher_request *req)
        struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
        struct async_aes_ctx *ctx = crypto_ablkcipher_ctx(tfm);
 
-       if (kernel_fpu_using()) {
+       if (irq_fpu_usable()) {
                struct ablkcipher_request *cryptd_req =
                        ablkcipher_request_ctx(req);
                memcpy(cryptd_req, req, sizeof(*req));

diff --git a/arch/x86/include/asm/i387.h b/arch/x86/include/asm/i387.h
index 175adf5..fb7f0d6 100644 (file)
--- a/arch/x86/include/asm/i387.h
+++ b/arch/x86/include/asm/i387.h
@@ -301,6 +301,14 @@ static inline void kernel_fpu_end(void)
        preempt_enable();
 }
 
+static inline bool irq_fpu_usable(void)
+{
+       struct pt_regs *regs;
+
+       return !in_interrupt() || !(regs = get_irq_regs()) || \
+               user_mode(regs) || (read_cr0() & X86_CR0_TS);
+}
+
 /*
  * Some instructions like VIA's padlock instructions generate a spurious
  * DNA fault but don't modify SSE registers. And these instructions