ehea: Add DLPAR memory remove support
The eHEA driver uses the recently modified walk_memory_resource for powerpc
functionality to detect the memory layout. It further uses the memory hotplug
notifiers to catch memory hotplug events.
Signed-off-by: Hannes Hering <hering2@de.ibm.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
diff --git a/drivers/net/ehea/ehea_qmr.c b/drivers/net/ehea/ehea_qmr.c
index d522e90..140f05b 100644
--- a/drivers/net/ehea/ehea_qmr.c
+++ b/drivers/net/ehea/ehea_qmr.c
@@ -31,8 +31,8 @@
#include "ehea_phyp.h"
#include "ehea_qmr.h"
+struct ehea_bmap *ehea_bmap = NULL;
-struct ehea_busmap ehea_bmap = { 0, 0, NULL };
static void *hw_qpageit_get_inc(struct hw_queue *queue)
@@ -559,125 +559,253 @@
return 0;
}
-int ehea_create_busmap(void)
+static inline int ehea_calc_index(unsigned long i, unsigned long s)
{
- u64 vaddr = EHEA_BUSMAP_START;
- unsigned long high_section_index = 0;
- int i;
+ return (i >> s) & EHEA_INDEX_MASK;
+}
- /*
- * Sections are not in ascending order -> Loop over all sections and
- * find the highest PFN to compute the required map size.
- */
- ehea_bmap.valid_sections = 0;
+static inline int ehea_init_top_bmap(struct ehea_top_bmap *ehea_top_bmap,
+ int dir)
+{
+ if(!ehea_top_bmap->dir[dir]) {
+ ehea_top_bmap->dir[dir] =
+ kzalloc(sizeof(struct ehea_dir_bmap), GFP_KERNEL);
+ if (!ehea_top_bmap->dir[dir])
+ return -ENOMEM;
+ }
+ return 0;
+}
- for (i = 0; i < NR_MEM_SECTIONS; i++)
- if (valid_section_nr(i))
- high_section_index = i;
+static inline int ehea_init_bmap(struct ehea_bmap *ehea_bmap, int top, int dir)
+{
+ if(!ehea_bmap->top[top]) {
+ ehea_bmap->top[top] =
+ kzalloc(sizeof(struct ehea_top_bmap), GFP_KERNEL);
+ if (!ehea_bmap->top[top])
+ return -ENOMEM;
+ }
+ return ehea_init_top_bmap(ehea_bmap->top[top], dir);
+}
- ehea_bmap.entries = high_section_index + 1;
- ehea_bmap.vaddr = vmalloc(ehea_bmap.entries * sizeof(*ehea_bmap.vaddr));
+static int ehea_create_busmap_callback(unsigned long pfn,
+ unsigned long nr_pages, void *arg)
+{
+ unsigned long i, mr_len, start_section, end_section;
+ start_section = (pfn * PAGE_SIZE) / EHEA_SECTSIZE;
+ end_section = start_section + ((nr_pages * PAGE_SIZE) / EHEA_SECTSIZE);
+ mr_len = *(unsigned long *)arg;
- if (!ehea_bmap.vaddr)
+ ehea_bmap = kzalloc(sizeof(struct ehea_bmap), GFP_KERNEL);
+ if (!ehea_bmap)
return -ENOMEM;
- for (i = 0 ; i < ehea_bmap.entries; i++) {
- unsigned long pfn = section_nr_to_pfn(i);
+ for (i = start_section; i < end_section; i++) {
+ int ret;
+ int top, dir, idx;
+ u64 vaddr;
- if (pfn_valid(pfn)) {
- ehea_bmap.vaddr[i] = vaddr;
- vaddr += EHEA_SECTSIZE;
- ehea_bmap.valid_sections++;
- } else
- ehea_bmap.vaddr[i] = 0;
+ top = ehea_calc_index(i, EHEA_TOP_INDEX_SHIFT);
+ dir = ehea_calc_index(i, EHEA_DIR_INDEX_SHIFT);
+
+ ret = ehea_init_bmap(ehea_bmap, top, dir);
+ if(ret)
+ return ret;
+
+ idx = i & EHEA_INDEX_MASK;
+ vaddr = EHEA_BUSMAP_START + mr_len + i * EHEA_SECTSIZE;
+
+ ehea_bmap->top[top]->dir[dir]->ent[idx] = vaddr;
}
+ mr_len += nr_pages * PAGE_SIZE;
+ *(unsigned long *)arg = mr_len;
+
return 0;
}
+static unsigned long ehea_mr_len;
+
+static DEFINE_MUTEX(ehea_busmap_mutex);
+
+int ehea_create_busmap(void)
+{
+ int ret;
+ mutex_lock(&ehea_busmap_mutex);
+ ehea_mr_len = 0;
+ ret = walk_memory_resource(0, 1ULL << MAX_PHYSMEM_BITS, &ehea_mr_len,
+ ehea_create_busmap_callback);
+ mutex_unlock(&ehea_busmap_mutex);
+ return ret;
+}
+
void ehea_destroy_busmap(void)
{
- vfree(ehea_bmap.vaddr);
+ int top, dir;
+ mutex_lock(&ehea_busmap_mutex);
+ if (!ehea_bmap)
+ goto out_destroy;
+
+ for (top = 0; top < EHEA_MAP_ENTRIES; top++) {
+ if (!ehea_bmap->top[top])
+ continue;
+
+ for (dir = 0; dir < EHEA_MAP_ENTRIES; dir++) {
+ if (!ehea_bmap->top[top]->dir[dir])
+ continue;
+
+ kfree(ehea_bmap->top[top]->dir[dir]);
+ }
+
+ kfree(ehea_bmap->top[top]);
+ }
+
+ kfree(ehea_bmap);
+ ehea_bmap = NULL;
+out_destroy:
+ mutex_unlock(&ehea_busmap_mutex);
}
u64 ehea_map_vaddr(void *caddr)
{
- u64 mapped_addr;
- unsigned long index = __pa(caddr) >> SECTION_SIZE_BITS;
+ int top, dir, idx;
+ unsigned long index, offset;
- if (likely(index < ehea_bmap.entries)) {
- mapped_addr = ehea_bmap.vaddr[index];
- if (likely(mapped_addr))
- mapped_addr |= (((unsigned long)caddr)
- & (EHEA_SECTSIZE - 1));
- else
- mapped_addr = -1;
- } else
- mapped_addr = -1;
+ if (!ehea_bmap)
+ return EHEA_INVAL_ADDR;
- if (unlikely(mapped_addr == -1))
- if (!test_and_set_bit(__EHEA_STOP_XFER, &ehea_driver_flags))
- schedule_work(&ehea_rereg_mr_task);
+ index = virt_to_abs(caddr) >> SECTION_SIZE_BITS;
+ top = (index >> EHEA_TOP_INDEX_SHIFT) & EHEA_INDEX_MASK;
+ if (!ehea_bmap->top[top])
+ return EHEA_INVAL_ADDR;
- return mapped_addr;
+ dir = (index >> EHEA_DIR_INDEX_SHIFT) & EHEA_INDEX_MASK;
+ if (!ehea_bmap->top[top]->dir[dir])
+ return EHEA_INVAL_ADDR;
+
+ idx = index & EHEA_INDEX_MASK;
+ if (!ehea_bmap->top[top]->dir[dir]->ent[idx])
+ return EHEA_INVAL_ADDR;
+
+ offset = (unsigned long)caddr & (EHEA_SECTSIZE - 1);
+ return ehea_bmap->top[top]->dir[dir]->ent[idx] | offset;
+}
+
+static inline void *ehea_calc_sectbase(int top, int dir, int idx)
+{
+ unsigned long ret = idx;
+ ret |= dir << EHEA_DIR_INDEX_SHIFT;
+ ret |= top << EHEA_TOP_INDEX_SHIFT;
+ return abs_to_virt(ret << SECTION_SIZE_BITS);
+}
+
+static u64 ehea_reg_mr_section(int top, int dir, int idx, u64 *pt,
+ struct ehea_adapter *adapter,
+ struct ehea_mr *mr)
+{
+ void *pg;
+ u64 j, m, hret;
+ unsigned long k = 0;
+ u64 pt_abs = virt_to_abs(pt);
+
+ void *sectbase = ehea_calc_sectbase(top, dir, idx);
+
+ for (j = 0; j < (EHEA_PAGES_PER_SECTION / EHEA_MAX_RPAGE); j++) {
+
+ for (m = 0; m < EHEA_MAX_RPAGE; m++) {
+ pg = sectbase + ((k++) * EHEA_PAGESIZE);
+ pt[m] = virt_to_abs(pg);
+ }
+ hret = ehea_h_register_rpage_mr(adapter->handle, mr->handle, 0,
+ 0, pt_abs, EHEA_MAX_RPAGE);
+
+ if ((hret != H_SUCCESS)
+ && (hret != H_PAGE_REGISTERED)) {
+ ehea_h_free_resource(adapter->handle, mr->handle,
+ FORCE_FREE);
+ ehea_error("register_rpage_mr failed");
+ return hret;
+ }
+ }
+ return hret;
+}
+
+static u64 ehea_reg_mr_sections(int top, int dir, u64 *pt,
+ struct ehea_adapter *adapter,
+ struct ehea_mr *mr)
+{
+ u64 hret = H_SUCCESS;
+ int idx;
+
+ for (idx = 0; idx < EHEA_MAP_ENTRIES; idx++) {
+ if (!ehea_bmap->top[top]->dir[dir]->ent[idx])
+ continue;
+
+ hret = ehea_reg_mr_section(top, dir, idx, pt, adapter, mr);
+ if ((hret != H_SUCCESS) && (hret != H_PAGE_REGISTERED))
+ return hret;
+ }
+ return hret;
+}
+
+static u64 ehea_reg_mr_dir_sections(int top, u64 *pt,
+ struct ehea_adapter *adapter,
+ struct ehea_mr *mr)
+{
+ u64 hret = H_SUCCESS;
+ int dir;
+
+ for (dir = 0; dir < EHEA_MAP_ENTRIES; dir++) {
+ if (!ehea_bmap->top[top]->dir[dir])
+ continue;
+
+ hret = ehea_reg_mr_sections(top, dir, pt, adapter, mr);
+ if ((hret != H_SUCCESS) && (hret != H_PAGE_REGISTERED))
+ return hret;
+ }
+ return hret;
}
int ehea_reg_kernel_mr(struct ehea_adapter *adapter, struct ehea_mr *mr)
{
int ret;
u64 *pt;
- void *pg;
- u64 hret, pt_abs, i, j, m, mr_len;
+ u64 hret;
u32 acc_ctrl = EHEA_MR_ACC_CTRL;
- mr_len = ehea_bmap.valid_sections * EHEA_SECTSIZE;
+ unsigned long top;
- pt = kzalloc(PAGE_SIZE, GFP_KERNEL);
+ pt = kzalloc(PAGE_SIZE, GFP_KERNEL);
if (!pt) {
ehea_error("no mem");
ret = -ENOMEM;
goto out;
}
- pt_abs = virt_to_abs(pt);
- hret = ehea_h_alloc_resource_mr(adapter->handle,
- EHEA_BUSMAP_START, mr_len,
- acc_ctrl, adapter->pd,
+ hret = ehea_h_alloc_resource_mr(adapter->handle, EHEA_BUSMAP_START,
+ ehea_mr_len, acc_ctrl, adapter->pd,
&mr->handle, &mr->lkey);
+
if (hret != H_SUCCESS) {
ehea_error("alloc_resource_mr failed");
ret = -EIO;
goto out;
}
- for (i = 0 ; i < ehea_bmap.entries; i++)
- if (ehea_bmap.vaddr[i]) {
- void *sectbase = __va(i << SECTION_SIZE_BITS);
- unsigned long k = 0;
+ if (!ehea_bmap) {
+ ehea_h_free_resource(adapter->handle, mr->handle, FORCE_FREE);
+ ehea_error("no busmap available");
+ ret = -EIO;
+ goto out;
+ }
- for (j = 0; j < (EHEA_PAGES_PER_SECTION /
- EHEA_MAX_RPAGE); j++) {
+ for (top = 0; top < EHEA_MAP_ENTRIES; top++) {
+ if (!ehea_bmap->top[top])
+ continue;
- for (m = 0; m < EHEA_MAX_RPAGE; m++) {
- pg = sectbase + ((k++) * EHEA_PAGESIZE);
- pt[m] = virt_to_abs(pg);
- }
-
- hret = ehea_h_register_rpage_mr(adapter->handle,
- mr->handle,
- 0, 0, pt_abs,
- EHEA_MAX_RPAGE);
- if ((hret != H_SUCCESS)
- && (hret != H_PAGE_REGISTERED)) {
- ehea_h_free_resource(adapter->handle,
- mr->handle,
- FORCE_FREE);
- ehea_error("register_rpage_mr failed");
- ret = -EIO;
- goto out;
- }
- }
- }
+ hret = ehea_reg_mr_dir_sections(top, pt, adapter, mr);
+ if((hret != H_PAGE_REGISTERED) && (hret != H_SUCCESS))
+ break;
+ }
if (hret != H_SUCCESS) {
ehea_h_free_resource(adapter->handle, mr->handle, FORCE_FREE);