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Code Issues Releases Activity

Add WC support for arm64 in the ENA driver

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As the pmamp_change_attr() is public on arm64 since r351131, it can be
used on the arm64 to map memory range as with the write combined
attribute.

It requires the driver to use generic VM_MEMATTR_WRITE_COMBINING flag
instead of the x86 specific PAT_WRITE_COMBINING.

Differential Revision: https://reviews.freebsd.org/D21931
Submitted by:  Michal Krawczyk <mk@semihalf.com>
Obtained from: Semihalf
Sponsored by:  Amazon, Inc.
This commit is contained in:
Marcin Wojtas 2019-10-31 15:38:17 +00:00
parent a3da4fc60b
commit 472d4784a8
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=354218
1 changed files with 2 additions and 10 deletions
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12
sys/dev/ena/ena.c
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@ -3309,7 +3309,7 @@ ena_calc_io_queue_num(struct ena_adapter *adapter,
static int
ena_enable_wc(struct resource *res)
{
#if defined(__i386) || defined(__amd64)
#if defined(__i386) || defined(__amd64) || defined(__aarch64__)
vm_offset_t va;
vm_size_t len;
int rc;
@ -3317,7 +3317,7 @@ ena_enable_wc(struct resource *res)
va = (vm_offset_t)rman_get_virtual(res);
len = rman_get_size(res);
/* Enable write combining */
rc = pmap_change_attr(va, len, PAT_WRITE_COMBINING);
rc = pmap_change_attr(va, len, VM_MEMATTR_WRITE_COMBINING);
if (unlikely(rc != 0)) {
ena_trace(ENA_ALERT, "pmap_change_attr failed, %d\n", rc);
return (rc);
@ -4352,14 +4352,6 @@ ena_attach(device_t pdev)
set_default_llq_configurations(&llq_config);
#if defined(__arm__) || defined(__aarch64__)
/*
* Force LLQ disable, as the driver is not supporting WC enablement
* on the ARM architecture. Using LLQ without WC would affect
* performance in a negative way.
*/
ena_dev->supported_features &= ~(1 << ENA_ADMIN_LLQ);
#endif
rc = ena_set_queues_placement_policy(pdev, ena_dev, &get_feat_ctx.llq,
&llq_config);
if (unlikely(rc != 0)) {