From: Richard Henderson <richard.henderson@linaro.org>
To: qemu-devel@nongnu.org
Subject: [PATCH v3 16/28] tcg: Replace region.end with region.total_size
Date: Sun, 2 May 2021 16:18:32 -0700 [thread overview]
Message-ID: <20210502231844.1977630-17-richard.henderson@linaro.org> (raw)
In-Reply-To: <20210502231844.1977630-1-richard.henderson@linaro.org>
A size is easier to work with than an end point,
particularly during initial buffer allocation.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
tcg/region.c | 29 +++++++++++++++++------------
1 file changed, 17 insertions(+), 12 deletions(-)
diff --git a/tcg/region.c b/tcg/region.c
index 9a1e039824..a17f342f38 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 = region.start;
}
if (curr_region == region.n - 1) {
- end = region.end;
+ end = region.start_aligned + region.total_size;
}
*pstart = start;
@@ -813,8 +813,8 @@ static bool alloc_code_gen_buffer(size_t size, int splitwx, 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;
@@ -826,19 +826,20 @@ void tcg_region_init(size_t tb_size, int splitwx, unsigned max_cpus)
assert(ok);
buf = tcg_init_ctx.code_gen_buffer;
- size = tcg_init_ctx.code_gen_buffer_size;
+ total_size = tcg_init_ctx.code_gen_buffer_size;
page_size = qemu_real_host_page_size;
n_regions = tcg_n_regions(max_cpus);
/* The first region will be 'aligned - buf' bytes larger than the others */
aligned = 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 start.
* As a result of this we might end up with a few extra pages at the end of
* the buffer; we will assign those to the last region.
*/
- region_size = (size - (aligned - buf)) / n_regions;
+ region_size = (total_size - (aligned - buf)) / n_regions;
region_size = QEMU_ALIGN_DOWN(region_size, page_size);
/* A region must have at least 2 pages; one code, one guard */
@@ -852,9 +853,11 @@ void tcg_region_init(size_t tb_size, int splitwx, unsigned max_cpus)
region.start = buf;
region.start_aligned = aligned;
/* page-align the end, since its last page will be a guard page */
- region.end = QEMU_ALIGN_PTR_DOWN(buf + size, page_size);
+ end = QEMU_ALIGN_PTR_DOWN(buf + total_size, page_size);
/* account for that last guard page */
- region.end -= page_size;
+ end -= page_size;
+ total_size = end - aligned;
+ region.total_size = total_size;
/*
* Set guard pages in the rw buffer, as that's the one into which
@@ -895,7 +898,7 @@ void tcg_region_prologue_set(TCGContext *s)
/* 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.start);
}
/*
@@ -936,8 +939,10 @@ size_t tcg_code_capacity(void)
/* no need for synchronization; these variables are set at init time */
guard_size = region.stride - region.size;
- capacity = region.end + guard_size - region.start;
- capacity -= region.n * (guard_size + TCG_HIGHWATER);
+ capacity = region.total_size;
+ capacity -= (region.n - 1) * guard_size;
+ capacity -= region.n * TCG_HIGHWATER;
+
return capacity;
}
--
2.25.1
next prev parent reply other threads:[~2021-05-02 23:37 UTC|newest]
Thread overview: 92+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-02 23:18 [PATCH v3 00/28] tcg: Clean up code_gen_buffer allocation Richard Henderson
2021-05-02 23:18 ` [PATCH v3 01/28] meson: Split out tcg/meson.build Richard Henderson
2021-06-07 19:38 ` Alex Bennée
2021-06-09 14:56 ` Luis Fernando Fujita Pires
2021-05-02 23:18 ` [PATCH v3 02/28] meson: Split out fpu/meson.build Richard Henderson
2021-06-07 19:38 ` Alex Bennée
2021-06-09 14:57 ` Luis Fernando Fujita Pires
2021-05-02 23:18 ` [PATCH v3 03/28] tcg: Re-order tcg_region_init vs tcg_prologue_init Richard Henderson
2021-06-08 9:04 ` Alex Bennée
2021-06-09 14:57 ` Luis Fernando Fujita Pires
2021-05-02 23:18 ` [PATCH v3 04/28] tcg: Remove error return from tcg_region_initial_alloc__locked Richard Henderson
2021-06-08 11:04 ` Alex Bennée
2021-06-08 15:44 ` Richard Henderson
2021-06-09 14:57 ` Luis Fernando Fujita Pires
2021-05-02 23:18 ` [PATCH v3 05/28] tcg: Split out tcg_region_initial_alloc Richard Henderson
2021-06-08 11:45 ` Alex Bennée
2021-06-09 14:57 ` Luis Fernando Fujita Pires
2021-05-02 23:18 ` [PATCH v3 06/28] tcg: Split out tcg_region_prologue_set Richard Henderson
2021-06-08 11:47 ` Alex Bennée
2021-06-09 14:57 ` Luis Fernando Fujita Pires
2021-05-02 23:18 ` [PATCH v3 07/28] tcg: Split out region.c Richard Henderson
2021-06-08 11:48 ` Alex Bennée
2021-06-09 14:57 ` Luis Fernando Fujita Pires
2021-05-02 23:18 ` [PATCH v3 08/28] accel/tcg: Inline cpu_gen_init Richard Henderson
2021-06-08 11:49 ` Alex Bennée
2021-06-09 14:57 ` Luis Fernando Fujita Pires
2021-05-02 23:18 ` [PATCH v3 09/28] accel/tcg: Move alloc_code_gen_buffer to tcg/region.c Richard Henderson
2021-06-08 11:50 ` Alex Bennée
2021-06-09 14:57 ` Luis Fernando Fujita Pires
2021-05-02 23:18 ` [PATCH v3 10/28] accel/tcg: Rename tcg_init to tcg_init_machine Richard Henderson
2021-06-08 11:51 ` Alex Bennée
2021-06-09 14:57 ` Luis Fernando Fujita Pires
2021-05-02 23:18 ` [PATCH v3 11/28] tcg: Create tcg_init Richard Henderson
2021-06-08 11:52 ` Alex Bennée
2021-06-09 14:57 ` Luis Fernando Fujita Pires
2021-05-02 23:18 ` [PATCH v3 12/28] accel/tcg: Merge tcg_exec_init into tcg_init_machine Richard Henderson
2021-06-08 11:55 ` Alex Bennée
2021-06-08 15:45 ` Richard Henderson
2021-06-09 14:58 ` Luis Fernando Fujita Pires
2021-06-10 15:16 ` Richard Henderson
2021-05-02 23:18 ` [PATCH v3 13/28] accel/tcg: Pass down max_cpus to tcg_init Richard Henderson
2021-06-08 15:44 ` Alex Bennée
2021-06-09 14:58 ` Luis Fernando Fujita Pires
2021-05-02 23:18 ` [PATCH v3 14/28] tcg: Introduce tcg_max_ctxs Richard Henderson
2021-06-08 15:54 ` Alex Bennée
2021-06-09 14:58 ` Luis Fernando Fujita Pires
2021-05-02 23:18 ` [PATCH v3 15/28] tcg: Move MAX_CODE_GEN_BUFFER_SIZE to tcg-target.h Richard Henderson
2021-06-08 15:56 ` Alex Bennée
2021-06-09 14:58 ` Luis Fernando Fujita Pires
2021-05-02 23:18 ` Richard Henderson [this message]
2021-06-08 16:03 ` [PATCH v3 16/28] tcg: Replace region.end with region.total_size Alex Bennée
2021-06-08 16:12 ` Richard Henderson
2021-06-09 14:58 ` Luis Fernando Fujita Pires
2021-05-02 23:18 ` [PATCH v3 17/28] tcg: Rename region.start to region.after_prologue Richard Henderson
2021-06-08 16:06 ` Alex Bennée
2021-06-09 14:58 ` Luis Fernando Fujita Pires
2021-05-02 23:18 ` [PATCH v3 18/28] tcg: Tidy tcg_n_regions Richard Henderson
2021-06-08 16:06 ` Alex Bennée
2021-06-09 14:58 ` Luis Fernando Fujita Pires
2021-05-02 23:18 ` [PATCH v3 19/28] tcg: Tidy split_cross_256mb Richard Henderson
2021-06-09 10:01 ` Alex Bennée
2021-06-09 14:59 ` Luis Fernando Fujita Pires
2021-06-10 15:20 ` Richard Henderson
2021-05-02 23:18 ` [PATCH v3 20/28] tcg: Move in_code_gen_buffer and tests to region.c Richard Henderson
2021-06-09 10:07 ` Alex Bennée
2021-06-09 14:59 ` Luis Fernando Fujita Pires
2021-05-02 23:18 ` [PATCH v3 21/28] tcg: Allocate code_gen_buffer into struct tcg_region_state Richard Henderson
2021-06-09 10:29 ` Alex Bennée
2021-06-09 14:59 ` Luis Fernando Fujita Pires
2021-05-02 23:18 ` [PATCH v3 22/28] tcg: Return the map protection from alloc_code_gen_buffer Richard Henderson
2021-06-09 10:30 ` Alex Bennée
2021-06-09 14:59 ` Luis Fernando Fujita Pires
2021-05-02 23:18 ` [PATCH v3 23/28] tcg: Sink qemu_madvise call to common code Richard Henderson
2021-06-09 10:34 ` Alex Bennée
2021-06-09 14:59 ` Luis Fernando Fujita Pires
2021-05-02 23:18 ` [PATCH v3 24/28] util/osdep: Add qemu_mprotect_rw Richard Henderson
2021-06-09 10:34 ` Alex Bennée
2021-06-09 14:59 ` Luis Fernando Fujita Pires
2021-05-02 23:18 ` [PATCH v3 25/28] tcg: Round the tb_size default from qemu_get_host_physmem Richard Henderson
2021-06-09 10:36 ` Alex Bennée
2021-06-09 14:59 ` Luis Fernando Fujita Pires
2021-05-02 23:18 ` [PATCH v3 26/28] tcg: Merge buffer protection and guard page protection Richard Henderson
2021-06-09 10:39 ` Alex Bennée
2021-06-09 14:59 ` Luis Fernando Fujita Pires
2021-05-02 23:18 ` [PATCH v3 27/28] tcg: When allocating for !splitwx, begin with PROT_NONE Richard Henderson
2021-06-09 11:21 ` Alex Bennée
2021-06-10 15:34 ` Richard Henderson
2021-06-09 14:59 ` Luis Fernando Fujita Pires
2021-05-02 23:18 ` [PATCH v3 28/28] tcg: Move tcg_init_ctx and tcg_ctx from accel/tcg/ Richard Henderson
2021-06-09 11:30 ` Alex Bennée
2021-06-09 14:59 ` Luis Fernando Fujita Pires
2021-05-02 23:45 ` [PATCH v3 00/28] tcg: Clean up code_gen_buffer allocation no-reply
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