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Merge tag 'arm64-mmiowb' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

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Pull mmiowb removal from Will Deacon:
 "Remove Mysterious Macro Intended to Obscure Weird Behaviours (mmiowb())

  Remove mmiowb() from the kernel memory barrier API and instead, for
  architectures that need it, hide the barrier inside spin_unlock() when
  MMIO has been performed inside the critical section.

  The only relatively recent changes have been addressing review
  comments on the documentation, which is in a much better shape thanks
  to the efforts of Ben and Ingo.

  I was initially planning to split this into two pull requests so that
  you could run the coccinelle script yourself, however it's been plain
  sailing in linux-next so I've just included the whole lot here to keep
  things simple"

* tag 'arm64-mmiowb' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (23 commits)
  docs/memory-barriers.txt: Update I/O section to be clearer about CPU vs thread
  docs/memory-barriers.txt: Fix style, spacing and grammar in I/O section
  arch: Remove dummy mmiowb() definitions from arch code
  net/ethernet/silan/sc92031: Remove stale comment about mmiowb()
  i40iw: Redefine i40iw_mmiowb() to do nothing
  scsi/qla1280: Remove stale comment about mmiowb()
  drivers: Remove explicit invocations of mmiowb()
  drivers: Remove useless trailing comments from mmiowb() invocations
  Documentation: Kill all references to mmiowb()
  riscv/mmiowb: Hook up mmwiob() implementation to asm-generic code
  powerpc/mmiowb: Hook up mmwiob() implementation to asm-generic code
  ia64/mmiowb: Add unconditional mmiowb() to arch_spin_unlock()
  mips/mmiowb: Add unconditional mmiowb() to arch_spin_unlock()
  sh/mmiowb: Add unconditional mmiowb() to arch_spin_unlock()
  m68k/io: Remove useless definition of mmiowb()
  nds32/io: Remove useless definition of mmiowb()
  x86/io: Remove useless definition of mmiowb()
  arm64/io: Remove useless definition of mmiowb()
  ARM/io: Remove useless definition of mmiowb()
  mmiowb: Hook up mmiowb helpers to spinlocks and generic I/O accessors
  ...
This commit is contained in:
Linus Torvalds
2019-05-06 16:57:52 -07:00
parent 14be4c61c2 9726840d9c
commit dd4e5d6106
181 changed files with 343 additions and 828 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/net/ethernet/qlogic/qed/qed_int.c
View File

@@ -814,18 +814,12 @@ static inline u16 qed_attn_update_idx(struct qed_hwfn *p_hwfn,
{
u16 rc = 0, index;
/* Make certain HW write took affect */
mmiowb();
index = le16_to_cpu(p_sb_desc->sb_attn->sb_index);
if (p_sb_desc->index != index) {
p_sb_desc->index = index;
rc = QED_SB_ATT_IDX;
}
/* Make certain we got a consistent view with HW */
mmiowb();
return rc;
}
@@ -1213,7 +1207,6 @@ static void qed_sb_ack_attn(struct qed_hwfn *p_hwfn,
/* Both segments (interrupts & acks) are written to same place address;
* Need to guarantee all commands will be received (in-order) by HW.
*/
mmiowb();
barrier();
}
@@ -1848,9 +1841,6 @@ static void qed_int_igu_enable_attn(struct qed_hwfn *p_hwfn,
qed_wr(p_hwfn, p_ptt, IGU_REG_TRAILING_EDGE_LATCH, 0xfff);
qed_wr(p_hwfn, p_ptt, IGU_REG_ATTENTION_ENABLE, 0xfff);
/* Flush the writes to IGU */
mmiowb();
/* Unmask AEU signals toward IGU */
qed_wr(p_hwfn, p_ptt, MISC_REG_AEU_MASK_ATTN_IGU, 0xff);
}
@@ -1914,9 +1904,6 @@ static void qed_int_igu_cleanup_sb(struct qed_hwfn *p_hwfn,
qed_wr(p_hwfn, p_ptt, IGU_REG_COMMAND_REG_CTRL, cmd_ctrl);
/* Flush the write to IGU */
mmiowb();
/* calculate where to read the status bit from */
sb_bit = 1 << (igu_sb_id % 32);
sb_bit_addr = igu_sb_id / 32 * sizeof(u32);

3
drivers/net/ethernet/qlogic/qed/qed_spq.c
View File

@@ -341,9 +341,6 @@ void qed_eq_prod_update(struct qed_hwfn *p_hwfn, u16 prod)
USTORM_EQE_CONS_OFFSET(p_hwfn->rel_pf_id);
REG_WR16(p_hwfn, addr, prod);
/* keep prod updates ordered */
mmiowb();
}
int qed_eq_completion(struct qed_hwfn *p_hwfn, void *cookie)