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Fri, 26 Jul 2019 07:43:55 +0100 From: To: Thread-Topic: [Qemu-devel] [PATCH v5 02/15] memory: Access MemoryRegion with MemOp Thread-Index: AQHVQ31+je5B6RiCz0CzDAf0F7Tipg== Date: Fri, 26 Jul 2019 06:43:55 +0000 Message-ID: <1564123434793.89101@bt.com> References: <3106a3c959c4498fad13a5799c89ba7b@tpw09926dag18e.domain1.systemhost.net> In-Reply-To: <3106a3c959c4498fad13a5799c89ba7b@tpw09926dag18e.domain1.systemhost.net> Accept-Language: en-AU, en-GB, en-US Content-Language: en-AU X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.187.101.42] MIME-Version: 1.0 X-detected-operating-system: by eggs.gnu.org: Windows 7 or 8 [fuzzy] X-Received-From: 213.121.35.78 Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.23 Subject: [Qemu-devel] [PATCH v5 02/15] memory: Access MemoryRegion with MemOp X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: peter.maydell@linaro.org, walling@linux.ibm.com, sagark@eecs.berkeley.edu, mst@redhat.com, palmer@sifive.com, mark.cave-ayland@ilande.co.uk, laurent@vivier.eu, Alistair.Francis@wdc.com, edgar.iglesias@gmail.com, arikalo@wavecomp.com, david@redhat.com, pasic@linux.ibm.com, borntraeger@de.ibm.com, rth@twiddle.net, atar4qemu@gmail.com, ehabkost@redhat.com, qemu-s390x@nongnu.org, qemu-arm@nongnu.org, stefanha@redhat.com, shorne@gmail.com, david@gibson.dropbear.id.au, qemu-riscv@nongnu.org, kbastian@mail.uni-paderborn.de, cohuck@redhat.com, alex.williamson@redhat.com, qemu-ppc@nongnu.org, amarkovic@wavecomp.com, pbonzini@redhat.com, aurelien@aurel32.net Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Type: text/plain; charset="utf-8" Change memory_region_dispatch_{read|write} parameter "unsigned size" to "MemOp op". The endianness encoded in MemOp will enable the collapse of two byte swaps, adjust_endianness and handle_bswap, along the I/O path. Interfaces will be converted in two steps: first syntactically then semantically. The syntax change is usage of no-op MEMOP_SIZE and SIZE_MEMOP macros. Being no-op there are no logical change, and we rely on coercion between unsigned and MemOp. The semantic change is implementing MEMOP_SIZE and SIZE_MEMOP to logically convert an unsigned size to and from a size+sign+endianness encoded MemOp. Signed-off-by: Tony Nguyen Reviewed-by: Richard Henderson --- include/exec/memop.h | 4 ++++ include/exec/memory.h | 9 +++++---- memory.c | 7 +++++-- 3 files changed, 14 insertions(+), 6 deletions(-) diff --git a/include/exec/memop.h b/include/exec/memop.h index ac58066..09c8d20 100644 --- a/include/exec/memop.h +++ b/include/exec/memop.h @@ -106,4 +106,8 @@ typedef enum MemOp { MO_SSIZE =3D MO_SIZE | MO_SIGN, } MemOp; +/* No-op while memory_region_dispatch_[read|write] is converted to MemOp */ +#define MEMOP_SIZE(op) (op) /* MemOp to size. */ +#define SIZE_MEMOP(ul) (ul) /* Size to MemOp. */ + #endif diff --git a/include/exec/memory.h b/include/exec/memory.h index bb0961d..0ea4843 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 of the access in bytes * @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(MemoryRegio= n *mr, * @mr: #MemoryRegion to access * @addr: address within that region * @data: data to write - * @size: size of the access in bytes + * @op: size of the access in bytes * @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..6982e19 100644 --- a/memory.c +++ b/memory.c @@ -1439,10 +1439,11 @@ static MemTxResult memory_region_dispatch_read1(Mem= oryRegion *mr, MemTxResult memory_region_dispatch_read(MemoryRegion *mr, hwaddr addr, uint64_t *pval, - unsigned size, + MemOp op, MemTxAttrs attrs) { MemTxResult r; + unsigned size =3D MEMOP_SIZE(op); if (!memory_region_access_valid(mr, addr, size, false, attrs)) { *pval =3D unassigned_mem_read(mr, addr, size); @@ -1483,9 +1484,11 @@ static bool memory_region_dispatch_write_eventfds(Me= moryRegion *mr, MemTxResult memory_region_dispatch_write(MemoryRegion *mr, hwaddr addr, uint64_t data, - unsigned size, + MemOp op, MemTxAttrs attrs) { + unsigned size =3D 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