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[PATCH v7 10/12] hw/mem/cxl_type3: Add DPA range validation for accesses
From: |
nifan . cxl |
Subject: |
[PATCH v7 10/12] hw/mem/cxl_type3: Add DPA range validation for accesses to DC regions |
Date: |
Thu, 18 Apr 2024 16:11:01 -0700 |
From: Fan Ni <fan.ni@samsung.com>
All DPA ranges in the DC regions are invalid to access until an extent
covering the range has been successfully accepted by the host. A bitmap
is added to each region to record whether a DC block in the region has
been backed by a DC extent. Each bit in the bitmap represents a DC block.
When a DC extent is accepted, all the bits representing the blocks in the
extent are set, which will be cleared when the extent is released.
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Fan Ni <fan.ni@samsung.com>
---
hw/cxl/cxl-mailbox-utils.c | 3 ++
hw/mem/cxl_type3.c | 76 +++++++++++++++++++++++++++++++++++++
include/hw/cxl/cxl_device.h | 7 ++++
3 files changed, 86 insertions(+)
diff --git a/hw/cxl/cxl-mailbox-utils.c b/hw/cxl/cxl-mailbox-utils.c
index 3569902e9e..57f1ce9cce 100644
--- a/hw/cxl/cxl-mailbox-utils.c
+++ b/hw/cxl/cxl-mailbox-utils.c
@@ -1655,6 +1655,7 @@ static CXLRetCode cmd_dcd_add_dyn_cap_rsp(const struct
cxl_cmd *cmd,
cxl_insert_extent_to_extent_list(extent_list, dpa, len, NULL, 0);
ct3d->dc.total_extent_count += 1;
+ ct3_set_region_block_backed(ct3d, dpa, len);
}
/* Remove the first extent group in the pending list*/
cxl_extent_group_list_delete_front(&ct3d->dc.extents_pending);
@@ -1813,10 +1814,12 @@ static CXLRetCode cmd_dcd_release_dyn_cap(const struct
cxl_cmd *cmd,
* list and update the extent count;
*/
QTAILQ_FOREACH_SAFE(ent, &ct3d->dc.extents, node, ent_next) {
+ ct3_clear_region_block_backed(ct3d, ent->start_dpa, ent->len);
cxl_remove_extent_from_extent_list(&ct3d->dc.extents, ent);
}
copy_extent_list(&ct3d->dc.extents, &updated_list);
QTAILQ_FOREACH_SAFE(ent, &updated_list, node, ent_next) {
+ ct3_set_region_block_backed(ct3d, ent->start_dpa, ent->len);
cxl_remove_extent_from_extent_list(&updated_list, ent);
}
ct3d->dc.total_extent_count = updated_list_size;
diff --git a/hw/mem/cxl_type3.c b/hw/mem/cxl_type3.c
index e892b3de7b..a3e1a5de25 100644
--- a/hw/mem/cxl_type3.c
+++ b/hw/mem/cxl_type3.c
@@ -665,6 +665,7 @@ static bool cxl_create_dc_regions(CXLType3Dev *ct3d, Error
**errp)
.flags = 0,
};
ct3d->dc.total_capacity += region->len;
+ region->blk_bitmap = bitmap_new(region->len / region->block_size);
}
QTAILQ_INIT(&ct3d->dc.extents);
QTAILQ_INIT(&ct3d->dc.extents_pending);
@@ -676,6 +677,8 @@ static void cxl_destroy_dc_regions(CXLType3Dev *ct3d)
{
CXLDCExtent *ent, *ent_next;
CXLDCExtentGroup *group, *group_next;
+ int i;
+ CXLDCRegion *region;
QTAILQ_FOREACH_SAFE(ent, &ct3d->dc.extents, node, ent_next) {
cxl_remove_extent_from_extent_list(&ct3d->dc.extents, ent);
@@ -688,6 +691,11 @@ static void cxl_destroy_dc_regions(CXLType3Dev *ct3d)
}
g_free(group);
}
+
+ for (i = 0; i < ct3d->dc.num_regions; i++) {
+ region = &ct3d->dc.regions[i];
+ g_free(region->blk_bitmap);
+ }
}
static bool cxl_setup_memory(CXLType3Dev *ct3d, Error **errp)
@@ -920,6 +928,70 @@ static void ct3_exit(PCIDevice *pci_dev)
}
}
+/*
+ * Mark the DPA range [dpa, dap + len - 1] to be backed and accessible. This
+ * happens when a DC extent is added and accepted by the host.
+ */
+void ct3_set_region_block_backed(CXLType3Dev *ct3d, uint64_t dpa,
+ uint64_t len)
+{
+ CXLDCRegion *region;
+
+ region = cxl_find_dc_region(ct3d, dpa, len);
+ if (!region) {
+ return;
+ }
+
+ bitmap_set(region->blk_bitmap, (dpa - region->base) / region->block_size,
+ len / region->block_size);
+}
+
+/*
+ * Check whether the DPA range [dpa, dpa + len - 1] is backed with DC extents.
+ * Used when validating read/write to dc regions
+ */
+bool ct3_test_region_block_backed(CXLType3Dev *ct3d, uint64_t dpa,
+ uint64_t len)
+{
+ CXLDCRegion *region;
+ uint64_t nbits;
+ long nr;
+
+ region = cxl_find_dc_region(ct3d, dpa, len);
+ if (!region) {
+ return false;
+ }
+
+ nr = (dpa - region->base) / region->block_size;
+ nbits = DIV_ROUND_UP(len, region->block_size);
+ /*
+ * if bits between [dpa, dpa + len) are all 1s, meaning the DPA range is
+ * backed with DC extents, return true; else return false.
+ */
+ return find_next_zero_bit(region->blk_bitmap, nr + nbits, nr) == nr +
nbits;
+}
+
+/*
+ * Mark the DPA range [dpa, dap + len - 1] to be unbacked and inaccessible.
+ * This happens when a dc extent is released by the host.
+ */
+void ct3_clear_region_block_backed(CXLType3Dev *ct3d, uint64_t dpa,
+ uint64_t len)
+{
+ CXLDCRegion *region;
+ uint64_t nbits;
+ long nr;
+
+ region = cxl_find_dc_region(ct3d, dpa, len);
+ if (!region) {
+ return;
+ }
+
+ nr = (dpa - region->base) / region->block_size;
+ nbits = len / region->block_size;
+ bitmap_clear(region->blk_bitmap, nr, nbits);
+}
+
static bool cxl_type3_dpa(CXLType3Dev *ct3d, hwaddr host_addr, uint64_t *dpa)
{
int hdm_inc = R_CXL_HDM_DECODER1_BASE_LO - R_CXL_HDM_DECODER0_BASE_LO;
@@ -1024,6 +1096,10 @@ static int cxl_type3_hpa_to_as_and_dpa(CXLType3Dev *ct3d,
*as = &ct3d->hostpmem_as;
*dpa_offset -= vmr_size;
} else {
+ if (!ct3_test_region_block_backed(ct3d, *dpa_offset, size)) {
+ return -ENODEV;
+ }
+
*as = &ct3d->dc.host_dc_as;
*dpa_offset -= (vmr_size + pmr_size);
}
diff --git a/include/hw/cxl/cxl_device.h b/include/hw/cxl/cxl_device.h
index c69ff6b5de..0a4fcb2800 100644
--- a/include/hw/cxl/cxl_device.h
+++ b/include/hw/cxl/cxl_device.h
@@ -456,6 +456,7 @@ typedef struct CXLDCRegion {
uint64_t block_size;
uint32_t dsmadhandle;
uint8_t flags;
+ unsigned long *blk_bitmap;
} CXLDCRegion;
struct CXLType3Dev {
@@ -577,4 +578,10 @@ CXLDCExtentGroup
*cxl_insert_extent_to_extent_group(CXLDCExtentGroup *group,
void cxl_extent_group_list_insert_tail(CXLDCExtentGroupList *list,
CXLDCExtentGroup *group);
void cxl_extent_group_list_delete_front(CXLDCExtentGroupList *list);
+void ct3_set_region_block_backed(CXLType3Dev *ct3d, uint64_t dpa,
+ uint64_t len);
+void ct3_clear_region_block_backed(CXLType3Dev *ct3d, uint64_t dpa,
+ uint64_t len);
+bool ct3_test_region_block_backed(CXLType3Dev *ct3d, uint64_t dpa,
+ uint64_t len);
#endif
--
2.43.0
- [PATCH v7 07/12] hw/mem/cxl_type3: Add DC extent list representative and get DC extent list mailbox support, (continued)
- [PATCH v7 07/12] hw/mem/cxl_type3: Add DC extent list representative and get DC extent list mailbox support, nifan . cxl, 2024/04/18
- [PATCH v7 02/12] hw/cxl/cxl-mailbox-utils: Add dynamic capacity region representative and mailbox command support, nifan . cxl, 2024/04/18
- [PATCH v7 03/12] include/hw/cxl/cxl_device: Rename mem_size as static_mem_size for type3 memory devices, nifan . cxl, 2024/04/18
- [PATCH v7 06/12] hw/mem/cxl_type3: Add host backend and address space handling for DC regions, nifan . cxl, 2024/04/18
- [PATCH v7 10/12] hw/mem/cxl_type3: Add DPA range validation for accesses to DC regions,
nifan . cxl <=
- [PATCH v7 11/12] hw/cxl/cxl-mailbox-utils: Add superset extent release mailbox support, nifan . cxl, 2024/04/18
- [PATCH v7 12/12] hw/mem/cxl_type3: Allow to release extent superset in QMP interface, nifan . cxl, 2024/04/18
- [PATCH v7 08/12] hw/cxl/cxl-mailbox-utils: Add mailbox commands to support add/release dynamic capacity response, nifan . cxl, 2024/04/18
- [PATCH v7 09/12] hw/cxl/events: Add qmp interfaces to add/release dynamic capacity extents, nifan . cxl, 2024/04/18