[PATCH v5 04/11] RISC-V: shunt isa_ext_arr to cpufeature.c

From: Conor Dooley
Date: Thu Jul 13 2023 - 08:13:52 EST

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To facilitate using one struct to define extensions, rather than having
several, shunt isa_ext_arr to cpufeature.c, where it will be used for
probing extension presence also.
As that scope of the array as widened, prefix it with riscv & drop the
type from the variable name.

Since the new array is const, print_isa() needs a wee bit of cleanup to
avoid complaints about losing the const qualifier.

Reviewed-by: Andrew Jones <ajones@xxxxxxxxxxxxxxxx>
Reviewed-by: Evan Green <evan@xxxxxxxxxxxx>
Signed-off-by: Conor Dooley <conor.dooley@xxxxxxxxxxxxx>
---
Changes in v2:
- Drop the empty element from the end of the array, it was adding a bug
anyway as I was not decrementing the result of ARRAY_SIZE() by one.
Likely I meant to drop it originally and forgot, as dropping the
decrement was intentional.
---
arch/riscv/include/asm/hwcap.h | 3 ++
arch/riscv/kernel/cpu.c | 75 +---------------------------------
arch/riscv/kernel/cpufeature.c | 67 ++++++++++++++++++++++++++++++
3 files changed, 72 insertions(+), 73 deletions(-)

diff --git a/arch/riscv/include/asm/hwcap.h b/arch/riscv/include/asm/hwcap.h
index f041bfa7f6a0..7a57e6109aef 100644
--- a/arch/riscv/include/asm/hwcap.h
+++ b/arch/riscv/include/asm/hwcap.h
@@ -76,6 +76,9 @@ struct riscv_isa_ext_data {
unsigned int isa_ext_id;
};

+extern const struct riscv_isa_ext_data riscv_isa_ext[];
+extern const size_t riscv_isa_ext_count;
+
unsigned long riscv_isa_extension_base(const unsigned long *isa_bitmap);

#define riscv_isa_extension_mask(ext) BIT_MASK(RISCV_ISA_EXT_##ext)
diff --git a/arch/riscv/kernel/cpu.c b/arch/riscv/kernel/cpu.c
index e721f15fdf17..bf93293d51f3 100644
--- a/arch/riscv/kernel/cpu.c
+++ b/arch/riscv/kernel/cpu.c
@@ -164,81 +164,10 @@ arch_initcall(riscv_cpuinfo_init);

#ifdef CONFIG_PROC_FS

-#define __RISCV_ISA_EXT_DATA(UPROP, EXTID) \
- { \
- .uprop = #UPROP, \
- .isa_ext_id = EXTID, \
- }
-
-/*
- * The canonical order of ISA extension names in the ISA string is defined in
- * chapter 27 of the unprivileged specification.
- *
- * Ordinarily, for in-kernel data structures, this order is unimportant but
- * isa_ext_arr defines the order of the ISA string in /proc/cpuinfo.
- *
- * The specification uses vague wording, such as should, when it comes to
- * ordering, so for our purposes the following rules apply:
- *
- * 1. All multi-letter extensions must be separated from other extensions by an
- * underscore.
- *
- * 2. Additional standard extensions (starting with 'Z') must be sorted after
- * single-letter extensions and before any higher-privileged extensions.
-
- * 3. The first letter following the 'Z' conventionally indicates the most
- * closely related alphabetical extension category, IMAFDQLCBKJTPVH.
- * If multiple 'Z' extensions are named, they must be ordered first by
- * category, then alphabetically within a category.
- *
- * 3. Standard supervisor-level extensions (starting with 'S') must be listed
- * after standard unprivileged extensions. If multiple supervisor-level
- * extensions are listed, they must be ordered alphabetically.
- *
- * 4. Standard machine-level extensions (starting with 'Zxm') must be listed
- * after any lower-privileged, standard extensions. If multiple
- * machine-level extensions are listed, they must be ordered
- * alphabetically.
- *
- * 5. Non-standard extensions (starting with 'X') must be listed after all
- * standard extensions. If multiple non-standard extensions are listed, they
- * must be ordered alphabetically.
- *
- * An example string following the order is:
- * rv64imadc_zifoo_zigoo_zafoo_sbar_scar_zxmbaz_xqux_xrux
- *
- * New entries to this struct should follow the ordering rules described above.
- */
-static struct riscv_isa_ext_data isa_ext_arr[] = {
- __RISCV_ISA_EXT_DATA(zicbom, RISCV_ISA_EXT_ZICBOM),
- __RISCV_ISA_EXT_DATA(zicboz, RISCV_ISA_EXT_ZICBOZ),
- __RISCV_ISA_EXT_DATA(zicntr, RISCV_ISA_EXT_ZICNTR),
- __RISCV_ISA_EXT_DATA(zicsr, RISCV_ISA_EXT_ZICSR),
- __RISCV_ISA_EXT_DATA(zifencei, RISCV_ISA_EXT_ZIFENCEI),
- __RISCV_ISA_EXT_DATA(zihintpause, RISCV_ISA_EXT_ZIHINTPAUSE),
- __RISCV_ISA_EXT_DATA(zihpm, RISCV_ISA_EXT_ZIHPM),
- __RISCV_ISA_EXT_DATA(zba, RISCV_ISA_EXT_ZBA),
- __RISCV_ISA_EXT_DATA(zbb, RISCV_ISA_EXT_ZBB),
- __RISCV_ISA_EXT_DATA(zbs, RISCV_ISA_EXT_ZBS),
- __RISCV_ISA_EXT_DATA(smaia, RISCV_ISA_EXT_SMAIA),
- __RISCV_ISA_EXT_DATA(ssaia, RISCV_ISA_EXT_SSAIA),
- __RISCV_ISA_EXT_DATA(sscofpmf, RISCV_ISA_EXT_SSCOFPMF),
- __RISCV_ISA_EXT_DATA(sstc, RISCV_ISA_EXT_SSTC),
- __RISCV_ISA_EXT_DATA(svinval, RISCV_ISA_EXT_SVINVAL),
- __RISCV_ISA_EXT_DATA(svnapot, RISCV_ISA_EXT_SVNAPOT),
- __RISCV_ISA_EXT_DATA(svpbmt, RISCV_ISA_EXT_SVPBMT),
- __RISCV_ISA_EXT_DATA("", RISCV_ISA_EXT_MAX),
-};
-
static void print_isa_ext(struct seq_file *f)
{
- struct riscv_isa_ext_data *edata;
- int i = 0, arr_sz;
-
- arr_sz = ARRAY_SIZE(isa_ext_arr) - 1;
-
- for (i = 0; i <= arr_sz; i++) {
- edata = &isa_ext_arr[i];
+ for (int i = 0; i < riscv_isa_ext_count; i++) {
+ const struct riscv_isa_ext_data *edata = &riscv_isa_ext[i];
if (!__riscv_isa_extension_available(NULL, edata->isa_ext_id))
continue;
seq_printf(f, "_%s", edata->uprop);
diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
index bdcf460ea53d..fb476153fffc 100644
--- a/arch/riscv/kernel/cpufeature.c
+++ b/arch/riscv/kernel/cpufeature.c
@@ -99,6 +99,73 @@ static bool riscv_isa_extension_check(int id)
return true;
}

+#define __RISCV_ISA_EXT_DATA(UPROP, EXTID) \
+ { \
+ .uprop = #UPROP, \
+ .isa_ext_id = EXTID, \
+ }
+
+/*
+ * The canonical order of ISA extension names in the ISA string is defined in
+ * chapter 27 of the unprivileged specification.
+ *
+ * Ordinarily, for in-kernel data structures, this order is unimportant but
+ * isa_ext_arr defines the order of the ISA string in /proc/cpuinfo.
+ *
+ * The specification uses vague wording, such as should, when it comes to
+ * ordering, so for our purposes the following rules apply:
+ *
+ * 1. All multi-letter extensions must be separated from other extensions by an
+ * underscore.
+ *
+ * 2. Additional standard extensions (starting with 'Z') must be sorted after
+ * single-letter extensions and before any higher-privileged extensions.
+ *
+ * 3. The first letter following the 'Z' conventionally indicates the most
+ * closely related alphabetical extension category, IMAFDQLCBKJTPVH.
+ * If multiple 'Z' extensions are named, they must be ordered first by
+ * category, then alphabetically within a category.
+ *
+ * 3. Standard supervisor-level extensions (starting with 'S') must be listed
+ * after standard unprivileged extensions. If multiple supervisor-level
+ * extensions are listed, they must be ordered alphabetically.
+ *
+ * 4. Standard machine-level extensions (starting with 'Zxm') must be listed
+ * after any lower-privileged, standard extensions. If multiple
+ * machine-level extensions are listed, they must be ordered
+ * alphabetically.
+ *
+ * 5. Non-standard extensions (starting with 'X') must be listed after all
+ * standard extensions. If multiple non-standard extensions are listed, they
+ * must be ordered alphabetically.
+ *
+ * An example string following the order is:
+ * rv64imadc_zifoo_zigoo_zafoo_sbar_scar_zxmbaz_xqux_xrux
+ *
+ * New entries to this struct should follow the ordering rules described above.
+ */
+const struct riscv_isa_ext_data riscv_isa_ext[] = {
+ __RISCV_ISA_EXT_DATA(zicbom, RISCV_ISA_EXT_ZICBOM),
+ __RISCV_ISA_EXT_DATA(zicboz, RISCV_ISA_EXT_ZICBOZ),
+ __RISCV_ISA_EXT_DATA(zicntr, RISCV_ISA_EXT_ZICNTR),
+ __RISCV_ISA_EXT_DATA(zicsr, RISCV_ISA_EXT_ZICSR),
+ __RISCV_ISA_EXT_DATA(zifencei, RISCV_ISA_EXT_ZIFENCEI),
+ __RISCV_ISA_EXT_DATA(zihintpause, RISCV_ISA_EXT_ZIHINTPAUSE),
+ __RISCV_ISA_EXT_DATA(zihpm, RISCV_ISA_EXT_ZIHPM),
+ __RISCV_ISA_EXT_DATA(zba, RISCV_ISA_EXT_ZBA),
+ __RISCV_ISA_EXT_DATA(zbb, RISCV_ISA_EXT_ZBB),
+ __RISCV_ISA_EXT_DATA(zbs, RISCV_ISA_EXT_ZBS),
+ __RISCV_ISA_EXT_DATA(smaia, RISCV_ISA_EXT_SMAIA),
+ __RISCV_ISA_EXT_DATA(ssaia, RISCV_ISA_EXT_SSAIA),
+ __RISCV_ISA_EXT_DATA(sscofpmf, RISCV_ISA_EXT_SSCOFPMF),
+ __RISCV_ISA_EXT_DATA(sstc, RISCV_ISA_EXT_SSTC),
+ __RISCV_ISA_EXT_DATA(svinval, RISCV_ISA_EXT_SVINVAL),
+ __RISCV_ISA_EXT_DATA(svnapot, RISCV_ISA_EXT_SVNAPOT),
+ __RISCV_ISA_EXT_DATA(svpbmt, RISCV_ISA_EXT_SVPBMT),
+};
+
+const size_t riscv_isa_ext_count = ARRAY_SIZE(riscv_isa_ext);
+
void __init riscv_fill_hwcap(void)
{
struct device_node *node;
--
2.40.1

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