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From: "Philippe Mathieu-Daudé" <philmd@redhat.com>
To: tony.nguyen@bt.com, qemu-devel@nongnu.org
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Subject: Re: [Qemu-devel] [PATCH v7 11/42] memory: Access MemoryRegion with MemOp
Date: Sun, 18 Aug 2019 23:44:24 +0200
Message-ID: <3872a5ec-ccf1-2978-34b5-b0b5478d2b86@redhat.com> (raw)
In-Reply-To: <1565940633026.69822@bt.com>

On 8/16/19 9:30 AM, tony.nguyen@bt.com wrote:
> Convert memory_region_dispatch_{read|write} operand "unsigned size"
> into a "MemOp op".
> 
> Signed-off-by: Tony Nguyen <tony.nguyen@bt.com>
> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
> ---
>  include/exec/memop.h  | 20 ++++++++++++++------
>  include/exec/memory.h |  9 +++++----
>  memory.c              |  7 +++++--
>  3 files changed, 24 insertions(+), 12 deletions(-)
> 
> diff --git a/include/exec/memop.h b/include/exec/memop.h
> index dfd76a1..0a610b7 100644
> --- a/include/exec/memop.h
> +++ b/include/exec/memop.h
> @@ -12,6 +12,8 @@
>  #ifndef MEMOP_H
>  #define MEMOP_H
>  
> +#include "qemu/host-utils.h"
> +
>  typedef enum MemOp {
>      MO_8     = 0,
>      MO_16    = 1,
> @@ -107,14 +109,20 @@ typedef enum MemOp {
>      MO_SSIZE = MO_SIZE | MO_SIGN,
>  } MemOp;
>  
> +/* MemOp to size in bytes.  */
> +static inline unsigned memop_size(MemOp op)
> +{
> +    return 1 << (op & MO_SIZE);
> +}
> +
>  /* Size in bytes to MemOp.  */
> -static inline unsigned size_memop(unsigned size)
> +static inline MemOp size_memop(unsigned size)
>  {
> -    /*
> -     * FIXME: No-op to aid conversion of
> memory_region_dispatch_{read|write}
> -     * "unsigned size" operand into a "MemOp op".
> -     */
> -    return size;
> +#ifdef CONFIG_DEBUG_TCG
> +    /* Power of 2 up to 8.  */
> +    assert((size & (size - 1)) == 0 && size >= 1 && size <= 8);

Easier to review as:

       assert(is_power_of_2(size) && size <= 8);

(This can be cleaned later).

> +#endif
> +    return ctz32(size);
>  }
>  
>  #endif
> diff --git a/include/exec/memory.h b/include/exec/memory.h
> index bb0961d..975b86a 100644
> --- a/include/exec/memory.h
> +++ b/include/exec/memory.h
> @@ -19,6 +19,7 @@
>  #include "exec/cpu-common.h"
>  #include "exec/hwaddr.h"
>  #include "exec/memattrs.h"
> +#include "exec/memop.h"
>  #include "exec/ramlist.h"
>  #include "qemu/queue.h"
>  #include "qemu/int128.h"
> @@ -1731,13 +1732,13 @@ void mtree_info(bool flatview, bool
> dispatch_tree, bool owner);
>   * @mr: #MemoryRegion to access
>   * @addr: address within that region
>   * @pval: pointer to uint64_t which the data is written to
> - * @size: size of the access in bytes
> + * @op: size, sign, and endianness of the memory operation
>   * @attrs: memory transaction attributes to use for the access
>   */
>  MemTxResult memory_region_dispatch_read(MemoryRegion *mr,
>                                          hwaddr addr,
>                                          uint64_t *pval,
> -                                        unsigned size,
> +                                        MemOp op,
>                                          MemTxAttrs attrs);
>  /**
>   * memory_region_dispatch_write: perform a write directly to the specified
> @@ -1746,13 +1747,13 @@ MemTxResult
> memory_region_dispatch_read(MemoryRegion *mr,
>   * @mr: #MemoryRegion to access
>   * @addr: address within that region
>   * @data: data to write
> - * @size: size of the access in bytes
> + * @op: size, sign, and endianness of the memory operation
>   * @attrs: memory transaction attributes to use for the access
>   */
>  MemTxResult memory_region_dispatch_write(MemoryRegion *mr,
>                                           hwaddr addr,
>                                           uint64_t data,
> -                                         unsigned size,
> +                                         MemOp op,
>                                           MemTxAttrs attrs);
>  
>  /**
> diff --git a/memory.c b/memory.c
> index 5d8c9a9..89ea4fb 100644
> --- a/memory.c
> +++ b/memory.c
> @@ -1439,9 +1439,10 @@ static MemTxResult
> memory_region_dispatch_read1(MemoryRegion *mr,
>  MemTxResult memory_region_dispatch_read(MemoryRegion *mr,
>                                          hwaddr addr,
>                                          uint64_t *pval,
> -                                        unsigned size,
> +                                        MemOp op,
>                                          MemTxAttrs attrs)
>  {
> +    unsigned size = memop_size(op);
>      MemTxResult r;
>  
>      if (!memory_region_access_valid(mr, addr, size, false, attrs)) {
> @@ -1483,9 +1484,11 @@ static bool
> memory_region_dispatch_write_eventfds(MemoryRegion *mr,
>  MemTxResult memory_region_dispatch_write(MemoryRegion *mr,
>                                           hwaddr addr,
>                                           uint64_t data,
> -                                         unsigned size,
> +                                         MemOp op,
>                                           MemTxAttrs attrs)
>  {
> +    unsigned size = memop_size(op);
> +
>      if (!memory_region_access_valid(mr, addr, size, true, attrs)) {
>          unassigned_mem_write(mr, addr, data, size);
>          return MEMTX_DECODE_ERROR;
> -- 
> 1.8.3.1
> 
> ​
> 
> 


  reply index

Thread overview: 63+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-16  6:28 [Qemu-devel] [PATCH v7 00/42] Invert Endian bit in SPARCv9 MMU TTE tony.nguyen
2019-08-16  7:08 ` [Qemu-devel] [PATCH v7 01/42] configure: Define TARGET_ALIGNED_ONLY tony.nguyen
2019-08-16  7:26 ` [Qemu-devel] [PATCH v7 02/42] tcg: TCGMemOp is now accelerator independent MemOp tony.nguyen
2019-08-16  7:27 ` [Qemu-devel] [PATCH v7 03/42] memory: Introduce size_memop tony.nguyen
2019-08-16  7:27 ` [Qemu-devel] [PATCH v7 04/42] target/mips: Access MemoryRegion with MemOp tony.nguyen
2019-08-16  7:28 ` [Qemu-devel] [PATCH v7 05/42] hw/s390x: " tony.nguyen
2019-08-16  7:28 ` [Qemu-devel] [PATCH v7 06/42] hw/intc/armv7m_nic: " tony.nguyen
2019-08-16  7:28 ` [Qemu-devel] [PATCH v7 07/42] hw/virtio: " tony.nguyen
2019-08-16  7:29 ` [Qemu-devel] [PATCH v7 08/42] hw/vfio: " tony.nguyen
2019-08-16  7:29 ` [Qemu-devel] [PATCH v7 09/42] exec: " tony.nguyen
2019-08-16  7:30 ` [Qemu-devel] [PATCH v7 10/42] cputlb: " tony.nguyen
2019-08-16  7:30 ` [Qemu-devel] [PATCH v7 11/42] memory: " tony.nguyen
2019-08-18 21:44   ` Philippe Mathieu-Daudé [this message]
2019-08-16  7:30 ` [Qemu-devel] [PATCH v7 12/42] hw/s390x: Hard code size with MO_{8|16|32|64} tony.nguyen
2019-08-16  7:31 ` [Qemu-devel] [PATCH v7 13/42] target/mips: " tony.nguyen
2019-08-16  7:31 ` [Qemu-devel] [PATCH v7 14/42] exec: " tony.nguyen
2019-08-16  7:31 ` [Qemu-devel] [PATCH v7 15/42] hw/audio: Declare device little or big endian tony.nguyen
2019-08-16  7:32 ` [Qemu-devel] [PATCH v7 16/42] hw/block: " tony.nguyen
2019-08-16  7:32 ` [Qemu-devel] [PATCH v7 17/42] hw/char: " tony.nguyen
2019-08-16  7:32 ` [Qemu-devel] [PATCH v7 18/42] hw/display: " tony.nguyen
2019-08-16  7:33 ` [Qemu-devel] [PATCH v7 19/42] hw/dma: " tony.nguyen
2019-08-16  7:33 ` [Qemu-devel] [PATCH v7 20/42] hw/gpio: " tony.nguyen
2019-08-16  7:33 ` [Qemu-devel] [PATCH v7 21/42] hw/i2c: " tony.nguyen
2019-08-16  7:33 ` [Qemu-devel] [PATCH v7 22/42] hw/input: " tony.nguyen
2019-08-16  7:34 ` [Qemu-devel] [PATCH v7 23/42] hw/intc: " tony.nguyen
2019-08-16  7:34 ` [Qemu-devel] [PATCH v7 24/42] hw/isa: " tony.nguyen
2019-08-16 10:01   ` Philippe Mathieu-Daudé
2019-08-16  7:34 ` [Qemu-devel] [PATCH v7 25/42] hw/misc: " tony.nguyen
2019-08-16 10:04   ` Philippe Mathieu-Daudé
2019-08-19 18:26     ` Paolo Bonzini
2019-08-16  7:35 ` [Qemu-devel] [PATCH v7 26/42] hw/net: " tony.nguyen
2019-08-16  7:35 ` [Qemu-devel] [PATCH v7 27/42] hw/pci-host: " tony.nguyen
2019-08-16 10:06   ` Philippe Mathieu-Daudé
2019-08-16  7:35 ` [Qemu-devel] [PATCH v7 28/42] hw/sd: " tony.nguyen
2019-08-16  7:35 ` [Qemu-devel] [PATCH v7 29/42] hw/ssi: " tony.nguyen
2019-08-16  7:36 ` [Qemu-devel] [PATCH v7 30/42] hw/timer: " tony.nguyen
2019-08-16  7:36 ` [Qemu-devel] [PATCH v7 31/42] build: Correct non-common common-obj-* to obj-* tony.nguyen
2019-08-16  7:36 ` [Qemu-devel] [PATCH v7 32/42] exec: Map device_endian onto MemOp tony.nguyen
2019-08-16  7:37 ` [Qemu-devel] [PATCH v7 33/42] exec: Replace device_endian with MemOp tony.nguyen
2019-08-16 10:12   ` [Qemu-devel] [qemu-s390x] " Thomas Huth
2019-08-19 18:28     ` Paolo Bonzini
2019-08-19 18:29       ` Paolo Bonzini
2019-08-19 21:01         ` Richard Henderson
2019-08-20  3:11           ` Edgar E. Iglesias
2019-08-16  7:37 ` [Qemu-devel] [PATCH v7 34/42] exec: Delete device_endian tony.nguyen
2019-08-16  7:37 ` [Qemu-devel] [PATCH v7 35/42] exec: Delete DEVICE_HOST_ENDIAN tony.nguyen
2019-08-16  7:38 ` [Qemu-devel] [PATCH v7 36/42] memory: Access MemoryRegion with endianness tony.nguyen
2019-08-18 12:22   ` Richard Henderson
2019-08-16  7:38 ` [Qemu-devel] [PATCH v7 37/42] cputlb: Replace size and endian operands for MemOp tony.nguyen
2019-08-18 12:37   ` Richard Henderson
2019-08-16  7:38 ` [Qemu-devel] [PATCH v7 38/42] memory: Single byte swap along the I/O path tony.nguyen
2019-08-18 12:46   ` Richard Henderson
2019-08-16  7:39 ` [Qemu-devel] [PATCH v7 39/42] cpu: TLB_FLAGS_MASK bit to force memory slow path tony.nguyen
2019-08-16  7:39 ` [Qemu-devel] [PATCH v7 40/42] cputlb: Byte swap memory transaction attribute tony.nguyen
2019-08-16  7:39 ` [Qemu-devel] [PATCH v7 41/42] target/sparc: Add TLB entry with attributes tony.nguyen
2019-08-16  7:39 ` [Qemu-devel] [PATCH v7 42/42] target/sparc: sun4u Invert Endian TTE bit tony.nguyen
2019-08-16  8:03 ` [Qemu-devel] [PATCH v7 33/42] exec: Replace device_endian with MemOp tony.nguyen
2019-08-16  9:33 ` tony.nguyen
2019-08-16  9:58 ` [Qemu-devel] [PATCH v7 00/42] Invert Endian bit in SPARCv9 MMU TTE Philippe Mathieu-Daudé
2019-08-16 11:37   ` tony.nguyen
2019-08-16 12:02     ` Peter Maydell
2019-08-16 11:43   ` David Gibson
2019-08-18  9:13 ` Richard Henderson

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