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authorLinus Torvalds <torvalds@linux-foundation.org>2018-08-26 11:48:42 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-08-26 11:48:42 -0700
commitaba16dc5cf9318b4e0fe92f8261779cd9f1d2d77 (patch)
tree1f53d2cee40e82efe6a727208307af475327af9a /arch
parentc4726e774ed27680c418e138234dfd2b8e1e89ac (diff)
parent1df895190233fcc30d46beca4550bcafb7b959a6 (diff)
download96b-common-aba16dc5cf9318b4e0fe92f8261779cd9f1d2d77.tar.gz
Merge branch 'ida-4.19' of git://git.infradead.org/users/willy/linux-dax
Pull IDA updates from Matthew Wilcox: "A better IDA API: id = ida_alloc(ida, GFP_xxx); ida_free(ida, id); rather than the cumbersome ida_simple_get(), ida_simple_remove(). The new IDA API is similar to ida_simple_get() but better named. The internal restructuring of the IDA code removes the bitmap preallocation nonsense. I hope the net -200 lines of code is convincing" * 'ida-4.19' of git://git.infradead.org/users/willy/linux-dax: (29 commits) ida: Change ida_get_new_above to return the id ida: Remove old API test_ida: check_ida_destroy and check_ida_alloc test_ida: Convert check_ida_conv to new API test_ida: Move ida_check_max test_ida: Move ida_check_leaf idr-test: Convert ida_check_nomem to new API ida: Start new test_ida module target/iscsi: Allocate session IDs from an IDA iscsi target: fix session creation failure handling drm/vmwgfx: Convert to new IDA API dmaengine: Convert to new IDA API ppc: Convert vas ID allocation to new IDA API media: Convert entity ID allocation to new IDA API ppc: Convert mmu context allocation to new IDA API Convert net_namespace to new IDA API cb710: Convert to new IDA API rsxx: Convert to new IDA API osd: Convert to new IDA API sd: Convert to new IDA API ...
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/mm/mmu_context_book3s64.c44
-rw-r--r--arch/powerpc/platforms/powernv/vas-window.c26
2 files changed, 8 insertions, 62 deletions
diff --git a/arch/powerpc/mm/mmu_context_book3s64.c b/arch/powerpc/mm/mmu_context_book3s64.c
index 4a892d894a0f..dbd8f762140b 100644
--- a/arch/powerpc/mm/mmu_context_book3s64.c
+++ b/arch/powerpc/mm/mmu_context_book3s64.c
@@ -26,48 +26,16 @@
#include <asm/mmu_context.h>
#include <asm/pgalloc.h>
-static DEFINE_SPINLOCK(mmu_context_lock);
static DEFINE_IDA(mmu_context_ida);
static int alloc_context_id(int min_id, int max_id)
{
- int index, err;
-
-again:
- if (!ida_pre_get(&mmu_context_ida, GFP_KERNEL))
- return -ENOMEM;
-
- spin_lock(&mmu_context_lock);
- err = ida_get_new_above(&mmu_context_ida, min_id, &index);
- spin_unlock(&mmu_context_lock);
-
- if (err == -EAGAIN)
- goto again;
- else if (err)
- return err;
-
- if (index > max_id) {
- spin_lock(&mmu_context_lock);
- ida_remove(&mmu_context_ida, index);
- spin_unlock(&mmu_context_lock);
- return -ENOMEM;
- }
-
- return index;
+ return ida_alloc_range(&mmu_context_ida, min_id, max_id, GFP_KERNEL);
}
void hash__reserve_context_id(int id)
{
- int rc, result = 0;
-
- do {
- if (!ida_pre_get(&mmu_context_ida, GFP_KERNEL))
- break;
-
- spin_lock(&mmu_context_lock);
- rc = ida_get_new_above(&mmu_context_ida, id, &result);
- spin_unlock(&mmu_context_lock);
- } while (rc == -EAGAIN);
+ int result = ida_alloc_range(&mmu_context_ida, id, id, GFP_KERNEL);
WARN(result != id, "mmu: Failed to reserve context id %d (rc %d)\n", id, result);
}
@@ -172,9 +140,7 @@ int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
void __destroy_context(int context_id)
{
- spin_lock(&mmu_context_lock);
- ida_remove(&mmu_context_ida, context_id);
- spin_unlock(&mmu_context_lock);
+ ida_free(&mmu_context_ida, context_id);
}
EXPORT_SYMBOL_GPL(__destroy_context);
@@ -182,13 +148,11 @@ static void destroy_contexts(mm_context_t *ctx)
{
int index, context_id;
- spin_lock(&mmu_context_lock);
for (index = 0; index < ARRAY_SIZE(ctx->extended_id); index++) {
context_id = ctx->extended_id[index];
if (context_id)
- ida_remove(&mmu_context_ida, context_id);
+ ida_free(&mmu_context_ida, context_id);
}
- spin_unlock(&mmu_context_lock);
}
static void pte_frag_destroy(void *pte_frag)
diff --git a/arch/powerpc/platforms/powernv/vas-window.c b/arch/powerpc/platforms/powernv/vas-window.c
index ff9f48812331..e59e0e60e5b5 100644
--- a/arch/powerpc/platforms/powernv/vas-window.c
+++ b/arch/powerpc/platforms/powernv/vas-window.c
@@ -515,35 +515,17 @@ int init_winctx_regs(struct vas_window *window, struct vas_winctx *winctx)
return 0;
}
-static DEFINE_SPINLOCK(vas_ida_lock);
-
static void vas_release_window_id(struct ida *ida, int winid)
{
- spin_lock(&vas_ida_lock);
- ida_remove(ida, winid);
- spin_unlock(&vas_ida_lock);
+ ida_free(ida, winid);
}
static int vas_assign_window_id(struct ida *ida)
{
- int rc, winid;
-
- do {
- rc = ida_pre_get(ida, GFP_KERNEL);
- if (!rc)
- return -EAGAIN;
-
- spin_lock(&vas_ida_lock);
- rc = ida_get_new(ida, &winid);
- spin_unlock(&vas_ida_lock);
- } while (rc == -EAGAIN);
-
- if (rc)
- return rc;
+ int winid = ida_alloc_max(ida, VAS_WINDOWS_PER_CHIP - 1, GFP_KERNEL);
- if (winid > VAS_WINDOWS_PER_CHIP) {
- pr_err("Too many (%d) open windows\n", winid);
- vas_release_window_id(ida, winid);
+ if (winid == -ENOSPC) {
+ pr_err("Too many (%d) open windows\n", VAS_WINDOWS_PER_CHIP);
return -EAGAIN;
}