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[187.189.51.144]) by smtp.gmail.com with ESMTPSA id t2sm9337749qtd.13.2021.03.14.14.27.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 14 Mar 2021 14:27:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=cCuL+0Cr0Nxn0ond/pgRLvEba3AtjzB4cSKYgtHeHws=; b=czkvbfTBUnwW/ScjIkq8zyezdsj/aif2NiRQFji6uiQUVHhRqMBZxsmLtVpo0eFlG7 2L0FsnvP09dSc6s9aweOr65WpM71H0pwtVXCoBBbrRQlyKHvI2/Fx9mUqm5B2HCtpHXZ D02U0MA+sI7C6UeAUnFQP98i72VRtI7rQLlB+YiEN+Ge+bQj9+kCe30LjUXqkHha83FQ ia799cvCfvxzH9/MjC3jbPia7MSYF+9hwKQk41fJwzYEatXLT3AqWe+Vt7UuGYjXzi/w lQ1R+ecmwovuk3/jFUOkrnAnWMn/6N2uzq9uc5GP9GG+5ObERzb1/E+z8EjD/N8BBoPl /MjA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=cCuL+0Cr0Nxn0ond/pgRLvEba3AtjzB4cSKYgtHeHws=; b=GCBtBJixaGFp9Q6FktCr0u3d2Gt1OSh2fmjls8jxtJA2lT0IENCIHR3JYWdZdme4VJ aNvdg5t+n97lBL/Ih6S+QGD0/QTr74NqRNpXaa+3N87J4jXHYR+tZ0XD2+wY+P4MoMHH Rm5TFWXxLqVlbgW+QgnHZO7pxuGPOPThG8Nc3GGGiqPGZufXPzGqM9w47Ne3blmGm5Og a6xSlzdlrZwGSexYR4sfQilkoKQ/pqmrO943EUYew0lP29vB3Zdip/jymPA7EMo6Y6dA rRoKs8PW8DnN4EaXsaHaCY8Yal5PELZFeE6TuXixpg+xB0TAwb4ayuSCuQB7YV+l/HHW mAGw== X-Gm-Message-State: AOAM5332M/FJ82JoDWEModS0gUZxHL8+cCphYfOiAX8tp/oEcTqmcFXq uuA1IjZZkb/lC5LdLIIWtCfIhmtXTdmup7W9 X-Google-Smtp-Source: ABdhPJxcf27vhg3+wKc99eklNOWAs6vXjS83KU407qfv45l22m/U4e2mHRuNTPhS/fY17y7Q/D1QMA== X-Received: by 2002:a05:620a:1353:: with SMTP id c19mr23065731qkl.392.1615757264880; Sun, 14 Mar 2021 14:27:44 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PATCH v2 16/29] tcg: Replace region.end with region.total_size Date: Sun, 14 Mar 2021 15:27:11 -0600 Message-Id: <20210314212724.1917075-17-richard.henderson@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210314212724.1917075-1-richard.henderson@linaro.org> References: <20210314212724.1917075-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::734; envelope-from=richard.henderson@linaro.org; helo=mail-qk1-x734.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action 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: r.bolshakov@yadro.com, j@getutm.app Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" A size is easier to work with than an end point, particularly during initial buffer allocation. Signed-off-by: Richard Henderson --- tcg/region.c | 29 +++++++++++++++++------------ 1 file changed, 17 insertions(+), 12 deletions(-) diff --git a/tcg/region.c b/tcg/region.c index ae22308290..8e4dd0480b 100644 --- a/tcg/region.c +++ b/tcg/region.c @@ -48,7 +48,7 @@ struct tcg_region_state { /* fields set at init time */ void *start; void *start_aligned; - void *end; + size_t total_size; /* size of entire buffer */ size_t n; size_t size; /* size of one region */ size_t stride; /* .size + guard size */ @@ -279,7 +279,7 @@ static void tcg_region_bounds(size_t curr_region, void = **pstart, void **pend) start =3D region.start; } if (curr_region =3D=3D region.n - 1) { - end =3D region.end; + end =3D region.start_aligned + region.total_size; } =20 *pstart =3D start; @@ -813,8 +813,8 @@ static bool alloc_code_gen_buffer(size_t size, int spli= twx, Error **errp) */ void tcg_region_init(size_t tb_size, int splitwx, unsigned max_cpus) { - void *buf, *aligned; - size_t size; + void *buf, *aligned, *end; + size_t total_size; size_t page_size; size_t region_size; size_t n_regions; @@ -827,19 +827,20 @@ void tcg_region_init(size_t tb_size, int splitwx, uns= igned max_cpus) assert(ok); =20 buf =3D tcg_init_ctx.code_gen_buffer; - size =3D tcg_init_ctx.code_gen_buffer_size; + total_size =3D tcg_init_ctx.code_gen_buffer_size; page_size =3D qemu_real_host_page_size; n_regions =3D tcg_n_regions(max_cpus); =20 /* The first region will be 'aligned - buf' bytes larger than the othe= rs */ aligned =3D QEMU_ALIGN_PTR_UP(buf, page_size); - g_assert(aligned < tcg_init_ctx.code_gen_buffer + size); + g_assert(aligned < tcg_init_ctx.code_gen_buffer + total_size); + /* * Make region_size a multiple of page_size, using aligned as the star= t. * As a result of this we might end up with a few extra pages at the e= nd of * the buffer; we will assign those to the last region. */ - region_size =3D (size - (aligned - buf)) / n_regions; + region_size =3D (total_size - (aligned - buf)) / n_regions; region_size =3D QEMU_ALIGN_DOWN(region_size, page_size); =20 /* A region must have at least 2 pages; one code, one guard */ @@ -853,9 +854,11 @@ void tcg_region_init(size_t tb_size, int splitwx, unsi= gned max_cpus) region.start =3D buf; region.start_aligned =3D aligned; /* page-align the end, since its last page will be a guard page */ - region.end =3D QEMU_ALIGN_PTR_DOWN(buf + size, page_size); + end =3D QEMU_ALIGN_PTR_DOWN(buf + total_size, page_size); /* account for that last guard page */ - region.end -=3D page_size; + end -=3D page_size; + total_size =3D end - aligned; + region.total_size =3D total_size; =20 /* set guard pages */ splitwx_diff =3D tcg_splitwx_diff; @@ -893,7 +896,7 @@ void tcg_region_prologue_set(TCGContext *s) =20 /* Register the balance of the buffer with gdb. */ tcg_register_jit(tcg_splitwx_to_rx(region.start), - region.end - region.start); + region.start_aligned + region.total_size - region.sta= rt); } =20 /* @@ -934,8 +937,10 @@ size_t tcg_code_capacity(void) =20 /* no need for synchronization; these variables are set at init time */ guard_size =3D region.stride - region.size; - capacity =3D region.end + guard_size - region.start; - capacity -=3D region.n * (guard_size + TCG_HIGHWATER); + capacity =3D region.total_size; + capacity -=3D (region.n - 1) * guard_size; + capacity -=3D region.n * TCG_HIGHWATER; + return capacity; } =20 --=20 2.25.1