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drm/amdkfd: Make event limit dependent on user mode mapping size 

This allows increasing the KFD_SIGNAL_EVENT_LIMIT in kfd_ioctl.h
without breaking processes built with older kfd_ioctl.h versions.

Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
This commit is contained in:
Felix Kuehling 2017-10-27 19:35:29 -04:00 committed by Oded Gabbay
parent 3f04f96148
commit b9a5d0a5db
2 changed files with 20 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
drivers/gpu/drm/amd/amdkfd/kfd_events.c
View File

@ -97,9 +97,17 @@ static int allocate_event_notification_slot(struct kfd_process *p,
p->signal_page = allocate_signal_page(p);
if (!p->signal_page)
return -ENOMEM;
/* Oldest user mode expects 256 event slots */
p->signal_mapped_size = 256*8;
}
id = idr_alloc(&p->event_idr, ev, 0, KFD_SIGNAL_EVENT_LIMIT,
/*
* Compatibility with old user mode: Only use signal slots
* user mode has mapped, may be less than
* KFD_SIGNAL_EVENT_LIMIT. This also allows future increase
* of the event limit without breaking user mode.
*/
id = idr_alloc(&p->event_idr, ev, 0, p->signal_mapped_size / 8,
GFP_KERNEL);
if (id < 0)
return id;
@ -173,7 +181,8 @@ static int create_signal_event(struct file *devkfd,
{
int ret;
if (p->signal_event_count == KFD_SIGNAL_EVENT_LIMIT) {
if (p->signal_mapped_size &&
p->signal_event_count == p->signal_mapped_size / 8) {
if (!p->signal_event_limit_reached) {
pr_warn("Signal event wasn't created because limit was reached\n");
p->signal_event_limit_reached = true;
@ -744,12 +753,12 @@ out:
int kfd_event_mmap(struct kfd_process *p, struct vm_area_struct *vma)
{
unsigned long pfn;
struct kfd_signal_page *page;
int ret;
/* check required size is logical */
if (get_order(KFD_SIGNAL_EVENT_LIMIT * 8) !=
/* check required size doesn't exceed the allocated size */
if (get_order(KFD_SIGNAL_EVENT_LIMIT * 8) <
get_order(vma->vm_end - vma->vm_start)) {
pr_err("Event page mmap requested illegal size\n");
return -EINVAL;
@ -779,8 +788,12 @@ int kfd_event_mmap(struct kfd_process *p, struct vm_area_struct *vma)
page->user_address = (uint64_t __user *)vma->vm_start;
/* mapping the page to user process */
return remap_pfn_range(vma, vma->vm_start, pfn,
ret = remap_pfn_range(vma, vma->vm_start, pfn,
vma->vm_end - vma->vm_start, vma->vm_page_prot);
if (!ret)
p->signal_mapped_size = vma->vm_end - vma->vm_start;
return ret;
}
/*

1
drivers/gpu/drm/amd/amdkfd/kfd_priv.h
View File

@ -543,6 +543,7 @@ struct kfd_process {
struct idr event_idr;
/* Event page */
struct kfd_signal_page *signal_page;
size_t signal_mapped_size;
size_t signal_event_count;
bool signal_event_limit_reached;
};