Planning to merge this through the drm/vmwgfx tree soon, so if there
are any objections, please speak up.
Graphics APIs like OpenGL 4.4 and Vulkan require the graphics driver
to provide coherent graphics memory, meaning that the GPU sees any
content written to the coherent memory on the next GPU operation that
touches that memory, and the CPU sees any content written by the GPU
to that memory immediately after any fence object trailing the GPU
operation has signaled.
Paravirtual drivers that otherwise require explicit synchronization
needs to do this by hooking up dirty tracking to pagefault handlers
and buffer object validation. This is a first attempt to do that for
the vmwgfx driver.
The mm patches has been out for RFC. I think I have addressed all the
feedback I got, except a possible softdirty breakage. But although the
dirty-tracking and softdirty may write-protect PTEs both care about,
that shouldn't really cause any operation interference. In particular
since we use the hardware dirty PTE bits and softdirty uses other PTE bits.
For the TTM changes they are hopefully in line with the long-term
strategy of making helpers out of what's left of TTM.
The code has been tested and excercised by a tailored version of mesa
where we disable all explicit synchronization and assume graphics memory
is coherent. The performance loss varies of course; a typical number is
around 5%.
Changes v1-v2:
- Addressed a number of typos and formatting issues.
- Added a usage warning for apply_to_pfn_range() and apply_to_page_range()
- Re-evaluated the decision to use apply_to_pfn_range() rather than
modifying the pagewalk.c. It still looks like generically handling the
transparent huge page cases requires the mmap_sem to be held at least
in read mode, so sticking with apply_to_pfn_range() for now.
- The TTM page-fault helper vma copy argument was scratched in favour of
a pageprot_t argument.
Changes v3:
- Adapted to upstream API changes.
Changes v4:
- Adapted to upstream mmu_notifier changes. (Jerome?)
- Fixed a couple of warnings on 32-bit x86
- Fixed image offset computation on multisample images.
Changes v5:
- Updated usage warning in patch 3/9 after review comments from Nadav Amit.
Cc: Andrew Morton <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: Minchan Kim <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Huang Ying <[email protected]>
Cc: Souptick Joarder <[email protected]>
Cc: "Jérôme Glisse" <[email protected]>
Cc: "Christian König" <[email protected]>
Cc: [email protected]
From: Thomas Hellstrom <[email protected]>
Driver fault callbacks are allowed to drop the mmap_sem when expecting
long hardware waits to avoid blocking other mm users. Allow the mkwrite
callbacks to do the same by returning early on VM_FAULT_RETRY.
In particular we want to be able to drop the mmap_sem when waiting for
a reservation object lock on a GPU buffer object. These locks may be
held while waiting for the GPU.
Cc: Andrew Morton <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: Minchan Kim <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Huang Ying <[email protected]>
Cc: Souptick Joarder <[email protected]>
Cc: "Jérôme Glisse" <[email protected]>
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Thomas Hellstrom <[email protected]>
Reviewed-by: Ralph Campbell <[email protected]>
---
mm/memory.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/mm/memory.c b/mm/memory.c
index ddf20bd0c317..168f546af1ad 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2238,7 +2238,7 @@ static vm_fault_t do_page_mkwrite(struct vm_fault *vmf)
ret = vmf->vma->vm_ops->page_mkwrite(vmf);
/* Restore original flags so that caller is not surprised */
vmf->flags = old_flags;
- if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE)))
+ if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE | VM_FAULT_RETRY)))
return ret;
if (unlikely(!(ret & VM_FAULT_LOCKED))) {
lock_page(page);
@@ -2515,7 +2515,7 @@ static vm_fault_t wp_pfn_shared(struct vm_fault *vmf)
pte_unmap_unlock(vmf->pte, vmf->ptl);
vmf->flags |= FAULT_FLAG_MKWRITE;
ret = vma->vm_ops->pfn_mkwrite(vmf);
- if (ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE))
+ if (ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE | VM_FAULT_RETRY))
return ret;
return finish_mkwrite_fault(vmf);
}
@@ -2536,7 +2536,8 @@ static vm_fault_t wp_page_shared(struct vm_fault *vmf)
pte_unmap_unlock(vmf->pte, vmf->ptl);
tmp = do_page_mkwrite(vmf);
if (unlikely(!tmp || (tmp &
- (VM_FAULT_ERROR | VM_FAULT_NOPAGE)))) {
+ (VM_FAULT_ERROR | VM_FAULT_NOPAGE |
+ VM_FAULT_RETRY)))) {
put_page(vmf->page);
return tmp;
}
@@ -3601,7 +3602,8 @@ static vm_fault_t do_shared_fault(struct vm_fault *vmf)
unlock_page(vmf->page);
tmp = do_page_mkwrite(vmf);
if (unlikely(!tmp ||
- (tmp & (VM_FAULT_ERROR | VM_FAULT_NOPAGE)))) {
+ (tmp & (VM_FAULT_ERROR | VM_FAULT_NOPAGE |
+ VM_FAULT_RETRY)))) {
put_page(vmf->page);
return tmp;
}
--
2.20.1
From: Thomas Hellstrom <[email protected]>
This is basically apply_to_page_range with added functionality:
Allocating missing parts of the page table becomes optional, which
means that the function can be guaranteed not to error if allocation
is disabled. Also passing of the closure struct and callback function
becomes different and more in line with how things are done elsewhere.
Finally we keep apply_to_page_range as a wrapper around apply_to_pfn_range
The reason for not using the page-walk code is that we want to perform
the page-walk on vmas pointing to an address space without requiring the
mmap_sem to be held rather than on vmas belonging to a process with the
mmap_sem held.
Notable changes since RFC:
Don't export apply_to_pfn range.
Cc: Andrew Morton <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: Minchan Kim <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Huang Ying <[email protected]>
Cc: Souptick Joarder <[email protected]>
Cc: "Jérôme Glisse" <[email protected]>
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Thomas Hellstrom <[email protected]>
Reviewed-by: Ralph Campbell <[email protected]> #v1
---
include/linux/mm.h | 10 ++++
mm/memory.c | 135 ++++++++++++++++++++++++++++++++++-----------
2 files changed, 113 insertions(+), 32 deletions(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 0e8834ac32b7..3d06ce2a64af 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2675,6 +2675,16 @@ typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr,
extern int apply_to_page_range(struct mm_struct *mm, unsigned long address,
unsigned long size, pte_fn_t fn, void *data);
+struct pfn_range_apply;
+typedef int (*pter_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr,
+ struct pfn_range_apply *closure);
+struct pfn_range_apply {
+ struct mm_struct *mm;
+ pter_fn_t ptefn;
+ unsigned int alloc;
+};
+extern int apply_to_pfn_range(struct pfn_range_apply *closure,
+ unsigned long address, unsigned long size);
#ifdef CONFIG_PAGE_POISONING
extern bool page_poisoning_enabled(void);
diff --git a/mm/memory.c b/mm/memory.c
index 168f546af1ad..462aa47f8878 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2032,18 +2032,17 @@ int vm_iomap_memory(struct vm_area_struct *vma, phys_addr_t start, unsigned long
}
EXPORT_SYMBOL(vm_iomap_memory);
-static int apply_to_pte_range(struct mm_struct *mm, pmd_t *pmd,
- unsigned long addr, unsigned long end,
- pte_fn_t fn, void *data)
+static int apply_to_pte_range(struct pfn_range_apply *closure, pmd_t *pmd,
+ unsigned long addr, unsigned long end)
{
pte_t *pte;
int err;
pgtable_t token;
spinlock_t *uninitialized_var(ptl);
- pte = (mm == &init_mm) ?
+ pte = (closure->mm == &init_mm) ?
pte_alloc_kernel(pmd, addr) :
- pte_alloc_map_lock(mm, pmd, addr, &ptl);
+ pte_alloc_map_lock(closure->mm, pmd, addr, &ptl);
if (!pte)
return -ENOMEM;
@@ -2054,86 +2053,109 @@ static int apply_to_pte_range(struct mm_struct *mm, pmd_t *pmd,
token = pmd_pgtable(*pmd);
do {
- err = fn(pte++, token, addr, data);
+ err = closure->ptefn(pte++, token, addr, closure);
if (err)
break;
} while (addr += PAGE_SIZE, addr != end);
arch_leave_lazy_mmu_mode();
- if (mm != &init_mm)
+ if (closure->mm != &init_mm)
pte_unmap_unlock(pte-1, ptl);
return err;
}
-static int apply_to_pmd_range(struct mm_struct *mm, pud_t *pud,
- unsigned long addr, unsigned long end,
- pte_fn_t fn, void *data)
+static int apply_to_pmd_range(struct pfn_range_apply *closure, pud_t *pud,
+ unsigned long addr, unsigned long end)
{
pmd_t *pmd;
unsigned long next;
- int err;
+ int err = 0;
BUG_ON(pud_huge(*pud));
- pmd = pmd_alloc(mm, pud, addr);
+ pmd = pmd_alloc(closure->mm, pud, addr);
if (!pmd)
return -ENOMEM;
+
do {
next = pmd_addr_end(addr, end);
- err = apply_to_pte_range(mm, pmd, addr, next, fn, data);
+ if (!closure->alloc && pmd_none_or_clear_bad(pmd))
+ continue;
+ err = apply_to_pte_range(closure, pmd, addr, next);
if (err)
break;
} while (pmd++, addr = next, addr != end);
return err;
}
-static int apply_to_pud_range(struct mm_struct *mm, p4d_t *p4d,
- unsigned long addr, unsigned long end,
- pte_fn_t fn, void *data)
+static int apply_to_pud_range(struct pfn_range_apply *closure, p4d_t *p4d,
+ unsigned long addr, unsigned long end)
{
pud_t *pud;
unsigned long next;
- int err;
+ int err = 0;
- pud = pud_alloc(mm, p4d, addr);
+ pud = pud_alloc(closure->mm, p4d, addr);
if (!pud)
return -ENOMEM;
+
do {
next = pud_addr_end(addr, end);
- err = apply_to_pmd_range(mm, pud, addr, next, fn, data);
+ if (!closure->alloc && pud_none_or_clear_bad(pud))
+ continue;
+ err = apply_to_pmd_range(closure, pud, addr, next);
if (err)
break;
} while (pud++, addr = next, addr != end);
return err;
}
-static int apply_to_p4d_range(struct mm_struct *mm, pgd_t *pgd,
- unsigned long addr, unsigned long end,
- pte_fn_t fn, void *data)
+static int apply_to_p4d_range(struct pfn_range_apply *closure, pgd_t *pgd,
+ unsigned long addr, unsigned long end)
{
p4d_t *p4d;
unsigned long next;
- int err;
+ int err = 0;
- p4d = p4d_alloc(mm, pgd, addr);
+ p4d = p4d_alloc(closure->mm, pgd, addr);
if (!p4d)
return -ENOMEM;
+
do {
next = p4d_addr_end(addr, end);
- err = apply_to_pud_range(mm, p4d, addr, next, fn, data);
+ if (!closure->alloc && p4d_none_or_clear_bad(p4d))
+ continue;
+ err = apply_to_pud_range(closure, p4d, addr, next);
if (err)
break;
} while (p4d++, addr = next, addr != end);
return err;
}
-/*
- * Scan a region of virtual memory, filling in page tables as necessary
- * and calling a provided function on each leaf page table.
+/**
+ * apply_to_pfn_range - Scan a region of virtual memory, calling a provided
+ * function on each leaf page table entry
+ * @closure: Details about how to scan and what function to apply
+ * @addr: Start virtual address
+ * @size: Size of the region
+ *
+ * If @closure->alloc is set to 1, the function will fill in the page table
+ * as necessary. Otherwise it will skip non-present parts.
+ * Note: The caller must ensure that the range does not contain huge pages.
+ * The caller must also assure that the proper mmu_notifier functions are
+ * called before and after the call to apply_to_pfn_range.
+ *
+ * WARNING: Do not use this function unless you know exactly what you are
+ * doing. It is lacking support for huge pages and transparent huge pages.
+ *
+ * Return: Zero on success. If the provided function returns a non-zero status,
+ * the page table walk will terminate and that status will be returned.
+ * If @closure->alloc is set to 1, then this function may also return memory
+ * allocation errors arising from allocating page table memory.
*/
-int apply_to_page_range(struct mm_struct *mm, unsigned long addr,
- unsigned long size, pte_fn_t fn, void *data)
+int apply_to_pfn_range(struct pfn_range_apply *closure,
+ unsigned long addr, unsigned long size)
{
pgd_t *pgd;
unsigned long next;
@@ -2143,16 +2165,65 @@ int apply_to_page_range(struct mm_struct *mm, unsigned long addr,
if (WARN_ON(addr >= end))
return -EINVAL;
- pgd = pgd_offset(mm, addr);
+ pgd = pgd_offset(closure->mm, addr);
do {
next = pgd_addr_end(addr, end);
- err = apply_to_p4d_range(mm, pgd, addr, next, fn, data);
+ if (!closure->alloc && pgd_none_or_clear_bad(pgd))
+ continue;
+ err = apply_to_p4d_range(closure, pgd, addr, next);
if (err)
break;
} while (pgd++, addr = next, addr != end);
return err;
}
+
+/**
+ * struct page_range_apply - Closure structure for apply_to_page_range()
+ * @pter: The base closure structure we derive from
+ * @fn: The leaf pte function to call
+ * @data: The leaf pte function closure
+ */
+struct page_range_apply {
+ struct pfn_range_apply pter;
+ pte_fn_t fn;
+ void *data;
+};
+
+/*
+ * Callback wrapper to enable use of apply_to_pfn_range for
+ * the apply_to_page_range interface
+ */
+static int apply_to_page_range_wrapper(pte_t *pte, pgtable_t token,
+ unsigned long addr,
+ struct pfn_range_apply *pter)
+{
+ struct page_range_apply *pra =
+ container_of(pter, typeof(*pra), pter);
+
+ return pra->fn(pte, token, addr, pra->data);
+}
+
+/*
+ * Scan a region of virtual memory, filling in page tables as necessary
+ * and calling a provided function on each leaf page table.
+ *
+ * WARNING: Do not use this function unless you know exactly what you are
+ * doing. It is lacking support for huge pages and transparent huge pages.
+ */
+int apply_to_page_range(struct mm_struct *mm, unsigned long addr,
+ unsigned long size, pte_fn_t fn, void *data)
+{
+ struct page_range_apply pra = {
+ .pter = {.mm = mm,
+ .alloc = 1,
+ .ptefn = apply_to_page_range_wrapper },
+ .fn = fn,
+ .data = data
+ };
+
+ return apply_to_pfn_range(&pra.pter, addr, size);
+}
EXPORT_SYMBOL_GPL(apply_to_page_range);
/*
--
2.20.1
From: Thomas Hellstrom <[email protected]>
Add two utilities to a) write-protect and b) clean all ptes pointing into
a range of an address space.
The utilities are intended to aid in tracking dirty pages (either
driver-allocated system memory or pci device memory).
The write-protect utility should be used in conjunction with
page_mkwrite() and pfn_mkwrite() to trigger write page-faults on page
accesses. Typically one would want to use this on sparse accesses into
large memory regions. The clean utility should be used to utilize
hardware dirtying functionality and avoid the overhead of page-faults,
typically on large accesses into small memory regions.
The added file "as_dirty_helpers.c" is initially listed as maintained by
VMware under our DRM driver. If somebody would like it elsewhere,
that's of course no problem.
Notable changes since RFC:
- Added comments to help avoid the usage of these function for VMAs
it's not intended for. We also do advisory checks on the vm_flags and
warn on illegal usage.
- Perform the pte modifications the same way softdirty does.
- Add mmu_notifier range invalidation calls.
- Add a config option so that this code is not unconditionally included.
- Tell the mmu_gather code about pending tlb flushes.
Cc: Andrew Morton <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: Minchan Kim <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Huang Ying <[email protected]>
Cc: Souptick Joarder <[email protected]>
Cc: "Jérôme Glisse" <[email protected]>
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Thomas Hellstrom <[email protected]>
Reviewed-by: Ralph Campbell <[email protected]> #v1
---
MAINTAINERS | 1 +
include/linux/mm.h | 9 +-
mm/Kconfig | 3 +
mm/Makefile | 1 +
mm/as_dirty_helpers.c | 300 ++++++++++++++++++++++++++++++++++++++++++
5 files changed, 313 insertions(+), 1 deletion(-)
create mode 100644 mm/as_dirty_helpers.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 7a2f487ea49a..a55d4ef91b0b 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -5179,6 +5179,7 @@ T: git git://people.freedesktop.org/~thomash/linux
S: Supported
F: drivers/gpu/drm/vmwgfx/
F: include/uapi/drm/vmwgfx_drm.h
+F: mm/as_dirty_helpers.c
DRM DRIVERS
M: David Airlie <[email protected]>
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 3d06ce2a64af..a0bc2a82917e 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2685,7 +2685,14 @@ struct pfn_range_apply {
};
extern int apply_to_pfn_range(struct pfn_range_apply *closure,
unsigned long address, unsigned long size);
-
+unsigned long apply_as_wrprotect(struct address_space *mapping,
+ pgoff_t first_index, pgoff_t nr);
+unsigned long apply_as_clean(struct address_space *mapping,
+ pgoff_t first_index, pgoff_t nr,
+ pgoff_t bitmap_pgoff,
+ unsigned long *bitmap,
+ pgoff_t *start,
+ pgoff_t *end);
#ifdef CONFIG_PAGE_POISONING
extern bool page_poisoning_enabled(void);
extern void kernel_poison_pages(struct page *page, int numpages, int enable);
diff --git a/mm/Kconfig b/mm/Kconfig
index f0c76ba47695..5006d0e6a5c7 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -765,4 +765,7 @@ config GUP_BENCHMARK
config ARCH_HAS_PTE_SPECIAL
bool
+config AS_DIRTY_HELPERS
+ bool
+
endmenu
diff --git a/mm/Makefile b/mm/Makefile
index ac5e5ba78874..f5d412bbc2f7 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -104,3 +104,4 @@ obj-$(CONFIG_HARDENED_USERCOPY) += usercopy.o
obj-$(CONFIG_PERCPU_STATS) += percpu-stats.o
obj-$(CONFIG_HMM) += hmm.o
obj-$(CONFIG_MEMFD_CREATE) += memfd.o
+obj-$(CONFIG_AS_DIRTY_HELPERS) += as_dirty_helpers.o
diff --git a/mm/as_dirty_helpers.c b/mm/as_dirty_helpers.c
new file mode 100644
index 000000000000..0da7a8eed51a
--- /dev/null
+++ b/mm/as_dirty_helpers.c
@@ -0,0 +1,300 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/mm.h>
+#include <linux/mm_types.h>
+#include <linux/hugetlb.h>
+#include <linux/bitops.h>
+#include <linux/mmu_notifier.h>
+#include <asm/cacheflush.h>
+#include <asm/tlbflush.h>
+
+/**
+ * struct apply_as - Closure structure for apply_as_range
+ * @base: struct pfn_range_apply we derive from
+ * @start: Address of first modified pte
+ * @end: Address of last modified pte + 1
+ * @total: Total number of modified ptes
+ * @vma: Pointer to the struct vm_area_struct we're currently operating on
+ */
+struct apply_as {
+ struct pfn_range_apply base;
+ unsigned long start;
+ unsigned long end;
+ unsigned long total;
+ struct vm_area_struct *vma;
+};
+
+/**
+ * apply_pt_wrprotect - Leaf pte callback to write-protect a pte
+ * @pte: Pointer to the pte
+ * @token: Page table token, see apply_to_pfn_range()
+ * @addr: The virtual page address
+ * @closure: Pointer to a struct pfn_range_apply embedded in a
+ * struct apply_as
+ *
+ * The function write-protects a pte and records the range in
+ * virtual address space of touched ptes for efficient range TLB flushes.
+ *
+ * Return: Always zero.
+ */
+static int apply_pt_wrprotect(pte_t *pte, pgtable_t token,
+ unsigned long addr,
+ struct pfn_range_apply *closure)
+{
+ struct apply_as *aas = container_of(closure, typeof(*aas), base);
+ pte_t ptent = *pte;
+
+ if (pte_write(ptent)) {
+ pte_t old_pte = ptep_modify_prot_start(aas->vma, addr, pte);
+
+ ptent = pte_wrprotect(old_pte);
+ ptep_modify_prot_commit(aas->vma, addr, pte, old_pte, ptent);
+ aas->total++;
+ aas->start = min(aas->start, addr);
+ aas->end = max(aas->end, addr + PAGE_SIZE);
+ }
+
+ return 0;
+}
+
+/**
+ * struct apply_as_clean - Closure structure for apply_as_clean
+ * @base: struct apply_as we derive from
+ * @bitmap_pgoff: Address_space Page offset of the first bit in @bitmap
+ * @bitmap: Bitmap with one bit for each page offset in the address_space range
+ * covered.
+ * @start: Address_space page offset of first modified pte relative
+ * to @bitmap_pgoff
+ * @end: Address_space page offset of last modified pte relative
+ * to @bitmap_pgoff
+ */
+struct apply_as_clean {
+ struct apply_as base;
+ pgoff_t bitmap_pgoff;
+ unsigned long *bitmap;
+ pgoff_t start;
+ pgoff_t end;
+};
+
+/**
+ * apply_pt_clean - Leaf pte callback to clean a pte
+ * @pte: Pointer to the pte
+ * @token: Page table token, see apply_to_pfn_range()
+ * @addr: The virtual page address
+ * @closure: Pointer to a struct pfn_range_apply embedded in a
+ * struct apply_as_clean
+ *
+ * The function cleans a pte and records the range in
+ * virtual address space of touched ptes for efficient TLB flushes.
+ * It also records dirty ptes in a bitmap representing page offsets
+ * in the address_space, as well as the first and last of the bits
+ * touched.
+ *
+ * Return: Always zero.
+ */
+static int apply_pt_clean(pte_t *pte, pgtable_t token,
+ unsigned long addr,
+ struct pfn_range_apply *closure)
+{
+ struct apply_as *aas = container_of(closure, typeof(*aas), base);
+ struct apply_as_clean *clean = container_of(aas, typeof(*clean), base);
+ pte_t ptent = *pte;
+
+ if (pte_dirty(ptent)) {
+ pgoff_t pgoff = ((addr - aas->vma->vm_start) >> PAGE_SHIFT) +
+ aas->vma->vm_pgoff - clean->bitmap_pgoff;
+ pte_t old_pte = ptep_modify_prot_start(aas->vma, addr, pte);
+
+ ptent = pte_mkclean(old_pte);
+ ptep_modify_prot_commit(aas->vma, addr, pte, old_pte, ptent);
+
+ aas->total++;
+ aas->start = min(aas->start, addr);
+ aas->end = max(aas->end, addr + PAGE_SIZE);
+
+ __set_bit(pgoff, clean->bitmap);
+ clean->start = min(clean->start, pgoff);
+ clean->end = max(clean->end, pgoff + 1);
+ }
+
+ return 0;
+}
+
+/**
+ * apply_as_range - Apply a pte callback to all PTEs pointing into a range
+ * of an address_space.
+ * @mapping: Pointer to the struct address_space
+ * @aas: Closure structure
+ * @first_index: First page offset in the address_space
+ * @nr: Number of incremental page offsets to cover
+ *
+ * Return: Number of ptes touched. Note that this number might be larger
+ * than @nr if there are overlapping vmas
+ */
+static unsigned long apply_as_range(struct address_space *mapping,
+ struct apply_as *aas,
+ pgoff_t first_index, pgoff_t nr)
+{
+ struct vm_area_struct *vma;
+ pgoff_t vba, vea, cba, cea;
+ unsigned long start_addr, end_addr;
+ struct mmu_notifier_range range;
+
+ i_mmap_lock_read(mapping);
+ vma_interval_tree_foreach(vma, &mapping->i_mmap, first_index,
+ first_index + nr - 1) {
+ unsigned long vm_flags = READ_ONCE(vma->vm_flags);
+
+ /*
+ * We can only do advisory flag tests below, since we can't
+ * require the vm's mmap_sem to be held to protect the flags.
+ * Therefore, callers that strictly depend on specific mmap
+ * flags to remain constant throughout the operation must
+ * either ensure those flags are immutable for all relevant
+ * vmas or can't use this function. Fixing this properly would
+ * require the vma::vm_flags to be protected by a separate
+ * lock taken after the i_mmap_lock
+ */
+
+ /* Skip non-applicable VMAs */
+ if ((vm_flags & (VM_SHARED | VM_WRITE)) !=
+ (VM_SHARED | VM_WRITE))
+ continue;
+
+ /* Warn on and skip VMAs whose flags indicate illegal usage */
+ if (WARN_ON((vm_flags & (VM_HUGETLB | VM_IO)) != VM_IO))
+ continue;
+
+ /* Clip to the vma */
+ vba = vma->vm_pgoff;
+ vea = vba + vma_pages(vma);
+ cba = first_index;
+ cba = max(cba, vba);
+ cea = first_index + nr;
+ cea = min(cea, vea);
+
+ /* Translate to virtual address */
+ start_addr = ((cba - vba) << PAGE_SHIFT) + vma->vm_start;
+ end_addr = ((cea - vba) << PAGE_SHIFT) + vma->vm_start;
+ if (start_addr >= end_addr)
+ continue;
+
+ aas->base.mm = vma->vm_mm;
+ aas->vma = vma;
+ aas->start = end_addr;
+ aas->end = start_addr;
+
+ mmu_notifier_range_init(&range, MMU_NOTIFY_PROTECTION_PAGE, 0,
+ vma, vma->vm_mm, start_addr, end_addr);
+ mmu_notifier_invalidate_range_start(&range);
+
+ /* Needed when we only change protection? */
+ flush_cache_range(vma, start_addr, end_addr);
+
+ /*
+ * We're not using tlb_gather_mmu() since typically
+ * only a small subrange of PTEs are affected.
+ */
+ inc_tlb_flush_pending(vma->vm_mm);
+
+ /* Should not error since aas->base.alloc == 0 */
+ WARN_ON(apply_to_pfn_range(&aas->base, start_addr,
+ end_addr - start_addr));
+ if (aas->end > aas->start)
+ flush_tlb_range(vma, aas->start, aas->end);
+
+ mmu_notifier_invalidate_range_end(&range);
+ dec_tlb_flush_pending(vma->vm_mm);
+ }
+ i_mmap_unlock_read(mapping);
+
+ return aas->total;
+}
+
+/**
+ * apply_as_wrprotect - Write-protect all ptes in an address_space range
+ * @mapping: The address_space we want to write protect
+ * @first_index: The first page offset in the range
+ * @nr: Number of incremental page offsets to cover
+ *
+ * WARNING: This function should only be used for address spaces whose
+ * vmas are marked VM_IO and that do not contain huge pages.
+ * To avoid interference with COW'd pages, vmas not marked VM_SHARED are
+ * simply skipped.
+ *
+ * Return: The number of ptes actually write-protected. Note that
+ * already write-protected ptes are not counted.
+ */
+unsigned long apply_as_wrprotect(struct address_space *mapping,
+ pgoff_t first_index, pgoff_t nr)
+{
+ struct apply_as aas = {
+ .base = {
+ .alloc = 0,
+ .ptefn = apply_pt_wrprotect,
+ },
+ .total = 0,
+ };
+
+ return apply_as_range(mapping, &aas, first_index, nr);
+}
+EXPORT_SYMBOL(apply_as_wrprotect);
+
+/**
+ * apply_as_clean - Clean all ptes in an address_space range
+ * @mapping: The address_space we want to clean
+ * @first_index: The first page offset in the range
+ * @nr: Number of incremental page offsets to cover
+ * @bitmap_pgoff: The page offset of the first bit in @bitmap
+ * @bitmap: Pointer to a bitmap of at least @nr bits. The bitmap needs to
+ * cover the whole range @first_index..@first_index + @nr.
+ * @start: Pointer to number of the first set bit in @bitmap.
+ * is modified as new bits are set by the function.
+ * @end: Pointer to the number of the last set bit in @bitmap.
+ * none set. The value is modified as new bits are set by the function.
+ *
+ * Note: When this function returns there is no guarantee that a CPU has
+ * not already dirtied new ptes. However it will not clean any ptes not
+ * reported in the bitmap.
+ *
+ * If a caller needs to make sure all dirty ptes are picked up and none
+ * additional are added, it first needs to write-protect the address-space
+ * range and make sure new writers are blocked in page_mkwrite() or
+ * pfn_mkwrite(). And then after a TLB flush following the write-protection
+ * pick up all dirty bits.
+ *
+ * WARNING: This function should only be used for address spaces whose
+ * vmas are marked VM_IO and that do not contain huge pages.
+ * To avoid interference with COW'd pages, vmas not marked VM_SHARED are
+ * simply skipped.
+ *
+ * Return: The number of dirty ptes actually cleaned.
+ */
+unsigned long apply_as_clean(struct address_space *mapping,
+ pgoff_t first_index, pgoff_t nr,
+ pgoff_t bitmap_pgoff,
+ unsigned long *bitmap,
+ pgoff_t *start,
+ pgoff_t *end)
+{
+ bool none_set = (*start >= *end);
+ struct apply_as_clean clean = {
+ .base = {
+ .base = {
+ .alloc = 0,
+ .ptefn = apply_pt_clean,
+ },
+ .total = 0,
+ },
+ .bitmap_pgoff = bitmap_pgoff,
+ .bitmap = bitmap,
+ .start = none_set ? nr : *start,
+ .end = none_set ? 0 : *end,
+ };
+ unsigned long ret = apply_as_range(mapping, &clean.base, first_index,
+ nr);
+
+ *start = clean.start;
+ *end = clean.end;
+ return ret;
+}
+EXPORT_SYMBOL(apply_as_clean);
--
2.20.1
From: Thomas Hellstrom <[email protected]>
Add the callbacks necessary to implement emulated coherent memory for
surfaces. Add a flag to the gb_surface_create ioctl to indicate that
surface memory should be coherent.
Also bump the drm minor version to signal the availability of coherent
surfaces.
Signed-off-by: Thomas Hellstrom <[email protected]>
Reviewed-by: Deepak Rawat <[email protected]>
---
.../device_include/svga3d_surfacedefs.h | 233 ++++++++++-
drivers/gpu/drm/vmwgfx/vmwgfx_drv.h | 4 +-
drivers/gpu/drm/vmwgfx/vmwgfx_surface.c | 395 +++++++++++++++++-
include/uapi/drm/vmwgfx_drm.h | 4 +-
4 files changed, 629 insertions(+), 7 deletions(-)
diff --git a/drivers/gpu/drm/vmwgfx/device_include/svga3d_surfacedefs.h b/drivers/gpu/drm/vmwgfx/device_include/svga3d_surfacedefs.h
index f2bfd3d80598..61414f105c67 100644
--- a/drivers/gpu/drm/vmwgfx/device_include/svga3d_surfacedefs.h
+++ b/drivers/gpu/drm/vmwgfx/device_include/svga3d_surfacedefs.h
@@ -1280,7 +1280,6 @@ svga3dsurface_get_pixel_offset(SVGA3dSurfaceFormat format,
return offset;
}
-
static inline u32
svga3dsurface_get_image_offset(SVGA3dSurfaceFormat format,
surf_size_struct baseLevelSize,
@@ -1375,4 +1374,236 @@ svga3dsurface_is_screen_target_format(SVGA3dSurfaceFormat format)
return svga3dsurface_is_dx_screen_target_format(format);
}
+/**
+ * struct svga3dsurface_mip - Mimpmap level information
+ * @bytes: Bytes required in the backing store of this mipmap level.
+ * @img_stride: Byte stride per image.
+ * @row_stride: Byte stride per block row.
+ * @size: The size of the mipmap.
+ */
+struct svga3dsurface_mip {
+ size_t bytes;
+ size_t img_stride;
+ size_t row_stride;
+ struct drm_vmw_size size;
+
+};
+
+/**
+ * struct svga3dsurface_cache - Cached surface information
+ * @desc: Pointer to the surface descriptor
+ * @mip: Array of mipmap level information. Valid size is @num_mip_levels.
+ * @mip_chain_bytes: Bytes required in the backing store for the whole chain
+ * of mip levels.
+ * @sheet_bytes: Bytes required in the backing store for a sheet
+ * representing a single sample.
+ * @num_mip_levels: Valid size of the @mip array. Number of mipmap levels in
+ * a chain.
+ * @num_layers: Number of slices in an array texture or number of faces in
+ * a cubemap texture.
+ */
+struct svga3dsurface_cache {
+ const struct svga3d_surface_desc *desc;
+ struct svga3dsurface_mip mip[DRM_VMW_MAX_MIP_LEVELS];
+ size_t mip_chain_bytes;
+ size_t sheet_bytes;
+ u32 num_mip_levels;
+ u32 num_layers;
+};
+
+/**
+ * struct svga3dsurface_loc - Surface location
+ * @sub_resource: Surface subresource. Defined as layer * num_mip_levels +
+ * mip_level.
+ * @x: X coordinate.
+ * @y: Y coordinate.
+ * @z: Z coordinate.
+ */
+struct svga3dsurface_loc {
+ u32 sub_resource;
+ u32 x, y, z;
+};
+
+/**
+ * svga3dsurface_subres - Compute the subresource from layer and mipmap.
+ * @cache: Surface layout data.
+ * @mip_level: The mipmap level.
+ * @layer: The surface layer (face or array slice).
+ *
+ * Return: The subresource.
+ */
+static inline u32 svga3dsurface_subres(const struct svga3dsurface_cache *cache,
+ u32 mip_level, u32 layer)
+{
+ return cache->num_mip_levels * layer + mip_level;
+}
+
+/**
+ * svga3dsurface_setup_cache - Build a surface cache entry
+ * @size: The surface base level dimensions.
+ * @format: The surface format.
+ * @num_mip_levels: Number of mipmap levels.
+ * @num_layers: Number of layers.
+ * @cache: Pointer to a struct svga3dsurface_cach object to be filled in.
+ *
+ * Return: Zero on success, -EINVAL on invalid surface layout.
+ */
+static inline int svga3dsurface_setup_cache(const struct drm_vmw_size *size,
+ SVGA3dSurfaceFormat format,
+ u32 num_mip_levels,
+ u32 num_layers,
+ u32 num_samples,
+ struct svga3dsurface_cache *cache)
+{
+ const struct svga3d_surface_desc *desc;
+ u32 i;
+
+ memset(cache, 0, sizeof(*cache));
+ cache->desc = desc = svga3dsurface_get_desc(format);
+ cache->num_mip_levels = num_mip_levels;
+ cache->num_layers = num_layers;
+ for (i = 0; i < cache->num_mip_levels; i++) {
+ struct svga3dsurface_mip *mip = &cache->mip[i];
+
+ mip->size = svga3dsurface_get_mip_size(*size, i);
+ mip->bytes = svga3dsurface_get_image_buffer_size
+ (desc, &mip->size, 0);
+ mip->row_stride =
+ __KERNEL_DIV_ROUND_UP(mip->size.width,
+ desc->block_size.width) *
+ desc->bytes_per_block * num_samples;
+ if (!mip->row_stride)
+ goto invalid_dim;
+
+ mip->img_stride =
+ __KERNEL_DIV_ROUND_UP(mip->size.height,
+ desc->block_size.height) *
+ mip->row_stride;
+ if (!mip->img_stride)
+ goto invalid_dim;
+
+ cache->mip_chain_bytes += mip->bytes;
+ }
+ cache->sheet_bytes = cache->mip_chain_bytes * num_layers;
+ if (!cache->sheet_bytes)
+ goto invalid_dim;
+
+ return 0;
+
+invalid_dim:
+ VMW_DEBUG_USER("Invalid surface layout for dirty tracking.\n");
+ return -EINVAL;
+}
+
+/**
+ * svga3dsurface_get_loc - Get a surface location from an offset into the
+ * backing store
+ * @cache: Surface layout data.
+ * @loc: Pointer to a struct svga3dsurface_loc to be filled in.
+ * @offset: Offset into the surface backing store.
+ */
+static inline void
+svga3dsurface_get_loc(const struct svga3dsurface_cache *cache,
+ struct svga3dsurface_loc *loc,
+ size_t offset)
+{
+ const struct svga3dsurface_mip *mip = &cache->mip[0];
+ const struct svga3d_surface_desc *desc = cache->desc;
+ u32 layer;
+ int i;
+
+ if (offset >= cache->sheet_bytes)
+ offset %= cache->sheet_bytes;
+
+ layer = offset / cache->mip_chain_bytes;
+ offset -= layer * cache->mip_chain_bytes;
+ for (i = 0; i < cache->num_mip_levels; ++i, ++mip) {
+ if (mip->bytes > offset)
+ break;
+ offset -= mip->bytes;
+ }
+
+ loc->sub_resource = svga3dsurface_subres(cache, i, layer);
+ loc->z = offset / mip->img_stride;
+ offset -= loc->z * mip->img_stride;
+ loc->z *= desc->block_size.depth;
+ loc->y = offset / mip->row_stride;
+ offset -= loc->y * mip->row_stride;
+ loc->y *= desc->block_size.height;
+ loc->x = offset / desc->bytes_per_block;
+ loc->x *= desc->block_size.width;
+}
+
+/**
+ * svga3dsurface_inc_loc - Clamp increment a surface location with one block
+ * size
+ * in each dimension.
+ * @loc: Pointer to a struct svga3dsurface_loc to be incremented.
+ *
+ * When computing the size of a range as size = end - start, the range does not
+ * include the end element. However a location representing the last byte
+ * of a touched region in the backing store *is* included in the range.
+ * This function modifies such a location to match the end definition
+ * given as start + size which is the one used in a SVGA3dBox.
+ */
+static inline void
+svga3dsurface_inc_loc(const struct svga3dsurface_cache *cache,
+ struct svga3dsurface_loc *loc)
+{
+ const struct svga3d_surface_desc *desc = cache->desc;
+ u32 mip = loc->sub_resource % cache->num_mip_levels;
+ const struct drm_vmw_size *size = &cache->mip[mip].size;
+
+ loc->sub_resource++;
+ loc->x += desc->block_size.width;
+ if (loc->x > size->width)
+ loc->x = size->width;
+ loc->y += desc->block_size.height;
+ if (loc->y > size->height)
+ loc->y = size->height;
+ loc->z += desc->block_size.depth;
+ if (loc->z > size->depth)
+ loc->z = size->depth;
+}
+
+/**
+ * svga3dsurface_min_loc - The start location in a subresource
+ * @cache: Surface layout data.
+ * @sub_resource: The subresource.
+ * @loc: Pointer to a struct svga3dsurface_loc to be filled in.
+ */
+static inline void
+svga3dsurface_min_loc(const struct svga3dsurface_cache *cache,
+ u32 sub_resource,
+ struct svga3dsurface_loc *loc)
+{
+ loc->sub_resource = sub_resource;
+ loc->x = loc->y = loc->z = 0;
+}
+
+/**
+ * svga3dsurface_min_loc - The end location in a subresource
+ * @cache: Surface layout data.
+ * @sub_resource: The subresource.
+ * @loc: Pointer to a struct svga3dsurface_loc to be filled in.
+ *
+ * Following the end definition given in svga3dsurface_inc_loc(),
+ * Compute the end location of a surface subresource.
+ */
+static inline void
+svga3dsurface_max_loc(const struct svga3dsurface_cache *cache,
+ u32 sub_resource,
+ struct svga3dsurface_loc *loc)
+{
+ const struct drm_vmw_size *size;
+ u32 mip;
+
+ loc->sub_resource = sub_resource + 1;
+ mip = sub_resource % cache->num_mip_levels;
+ size = &cache->mip[mip].size;
+ loc->x = size->width;
+ loc->y = size->height;
+ loc->z = size->depth;
+}
+
#endif /* _SVGA3D_SURFACEDEFS_H_ */
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
index dae3a39bf402..5971c0d47507 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
@@ -44,9 +44,9 @@
#include <linux/sync_file.h>
#define VMWGFX_DRIVER_NAME "vmwgfx"
-#define VMWGFX_DRIVER_DATE "20180704"
+#define VMWGFX_DRIVER_DATE "20190328"
#define VMWGFX_DRIVER_MAJOR 2
-#define VMWGFX_DRIVER_MINOR 15
+#define VMWGFX_DRIVER_MINOR 16
#define VMWGFX_DRIVER_PATCHLEVEL 0
#define VMWGFX_FIFO_STATIC_SIZE (1024*1024)
#define VMWGFX_MAX_RELOCATIONS 2048
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
index c40d44f4d9af..637043f1befa 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
@@ -68,6 +68,20 @@ struct vmw_surface_offset {
uint32_t bo_offset;
};
+/**
+ * vmw_surface_dirty - Surface dirty-tracker
+ * @cache: Cached layout information of the surface.
+ * @size: Accounting size for the struct vmw_surface_dirty.
+ * @num_subres: Number of subresources.
+ * @boxes: Array of SVGA3dBoxes indicating dirty regions. One per subresource.
+ */
+struct vmw_surface_dirty {
+ struct svga3dsurface_cache cache;
+ size_t size;
+ u32 num_subres;
+ SVGA3dBox boxes[0];
+};
+
static void vmw_user_surface_free(struct vmw_resource *res);
static struct vmw_resource *
vmw_user_surface_base_to_res(struct ttm_base_object *base);
@@ -96,6 +110,13 @@ vmw_gb_surface_reference_internal(struct drm_device *dev,
struct drm_vmw_gb_surface_ref_ext_rep *rep,
struct drm_file *file_priv);
+static void vmw_surface_dirty_free(struct vmw_resource *res);
+static int vmw_surface_dirty_alloc(struct vmw_resource *res);
+static int vmw_surface_dirty_sync(struct vmw_resource *res);
+static void vmw_surface_dirty_range_add(struct vmw_resource *res, size_t start,
+ size_t end);
+static int vmw_surface_clean(struct vmw_resource *res);
+
static const struct vmw_user_resource_conv user_surface_conv = {
.object_type = VMW_RES_SURFACE,
.base_obj_to_res = vmw_user_surface_base_to_res,
@@ -133,7 +154,12 @@ static const struct vmw_res_func vmw_gb_surface_func = {
.create = vmw_gb_surface_create,
.destroy = vmw_gb_surface_destroy,
.bind = vmw_gb_surface_bind,
- .unbind = vmw_gb_surface_unbind
+ .unbind = vmw_gb_surface_unbind,
+ .dirty_alloc = vmw_surface_dirty_alloc,
+ .dirty_free = vmw_surface_dirty_free,
+ .dirty_sync = vmw_surface_dirty_sync,
+ .dirty_range_add = vmw_surface_dirty_range_add,
+ .clean = vmw_surface_clean,
};
/**
@@ -641,6 +667,7 @@ static void vmw_user_surface_free(struct vmw_resource *res)
struct vmw_private *dev_priv = srf->res.dev_priv;
uint32_t size = user_srf->size;
+ WARN_ON_ONCE(res->dirty);
if (user_srf->master)
drm_master_put(&user_srf->master);
kfree(srf->offsets);
@@ -1174,10 +1201,16 @@ static int vmw_gb_surface_bind(struct vmw_resource *res,
cmd2->header.id = SVGA_3D_CMD_UPDATE_GB_SURFACE;
cmd2->header.size = sizeof(cmd2->body);
cmd2->body.sid = res->id;
- res->backup_dirty = false;
}
vmw_fifo_commit(dev_priv, submit_size);
+ if (res->backup->dirty && res->backup_dirty) {
+ /* We've just made a full upload. Cear dirty regions. */
+ vmw_bo_dirty_clear_res(res);
+ }
+
+ res->backup_dirty = false;
+
return 0;
}
@@ -1642,7 +1675,8 @@ vmw_gb_surface_define_internal(struct drm_device *dev,
}
}
} else if (req->base.drm_surface_flags &
- drm_vmw_surface_flag_create_buffer)
+ (drm_vmw_surface_flag_create_buffer |
+ drm_vmw_surface_flag_coherent))
ret = vmw_user_bo_alloc(dev_priv, tfile,
res->backup_size,
req->base.drm_surface_flags &
@@ -1656,6 +1690,26 @@ vmw_gb_surface_define_internal(struct drm_device *dev,
goto out_unlock;
}
+ if (req->base.drm_surface_flags & drm_vmw_surface_flag_coherent) {
+ struct vmw_buffer_object *backup = res->backup;
+
+ ttm_bo_reserve(&backup->base, false, false, NULL);
+ if (!res->func->dirty_alloc)
+ ret = -EINVAL;
+ if (!ret)
+ ret = vmw_bo_dirty_add(backup);
+ if (!ret) {
+ res->coherent = true;
+ ret = res->func->dirty_alloc(res);
+ }
+ ttm_bo_unreserve(&backup->base);
+ if (ret) {
+ vmw_resource_unreference(&res);
+ goto out_unlock;
+ }
+
+ }
+
tmp = vmw_resource_reference(res);
ret = ttm_prime_object_init(tfile, res->backup_size, &user_srf->prime,
req->base.drm_surface_flags &
@@ -1764,3 +1818,338 @@ vmw_gb_surface_reference_internal(struct drm_device *dev,
return ret;
}
+
+/**
+ * vmw_subres_dirty_add - Add a dirty region to a subresource
+ * @dirty: The surfaces's dirty tracker.
+ * @loc_start: The location corresponding to the start of the region.
+ * @loc_end: The location corresponding to the end of the region.
+ *
+ * As we are assuming that @loc_start and @loc_end represent a sequential
+ * range of backing store memory, if the region spans multiple lines then
+ * regardless of the x coordinate, the full lines are dirtied.
+ * Correspondingly if the region spans multiple z slices, then full rather
+ * than partial z slices are dirtied.
+ */
+static void vmw_subres_dirty_add(struct vmw_surface_dirty *dirty,
+ const struct svga3dsurface_loc *loc_start,
+ const struct svga3dsurface_loc *loc_end)
+{
+ const struct svga3dsurface_cache *cache = &dirty->cache;
+ SVGA3dBox *box = &dirty->boxes[loc_start->sub_resource];
+ u32 mip = loc_start->sub_resource % cache->num_mip_levels;
+ const struct drm_vmw_size *size = &cache->mip[mip].size;
+ u32 box_c2 = box->z + box->d;
+
+ if (WARN_ON(loc_start->sub_resource >= dirty->num_subres))
+ return;
+
+ if (box->d == 0 || box->z > loc_start->z)
+ box->z = loc_start->z;
+ if (box_c2 < loc_end->z)
+ box->d = loc_end->z - box->z;
+
+ if (loc_start->z + 1 == loc_end->z) {
+ box_c2 = box->y + box->h;
+ if (box->h == 0 || box->y > loc_start->y)
+ box->y = loc_start->y;
+ if (box_c2 < loc_end->y)
+ box->h = loc_end->y - box->y;
+
+ if (loc_start->y + 1 == loc_end->y) {
+ box_c2 = box->x + box->w;
+ if (box->w == 0 || box->x > loc_start->x)
+ box->x = loc_start->x;
+ if (box_c2 < loc_end->x)
+ box->w = loc_end->x - box->x;
+ } else {
+ box->x = 0;
+ box->w = size->width;
+ }
+ } else {
+ box->y = 0;
+ box->h = size->height;
+ box->x = 0;
+ box->w = size->width;
+ }
+}
+
+/**
+ * vmw_subres_dirty_full - Mark a full subresource as dirty
+ * @dirty: The surface's dirty tracker.
+ * @subres: The subresource
+ */
+static void vmw_subres_dirty_full(struct vmw_surface_dirty *dirty, u32 subres)
+{
+ const struct svga3dsurface_cache *cache = &dirty->cache;
+ u32 mip = subres % cache->num_mip_levels;
+ const struct drm_vmw_size *size = &cache->mip[mip].size;
+ SVGA3dBox *box = &dirty->boxes[subres];
+
+ box->x = 0;
+ box->y = 0;
+ box->z = 0;
+ box->w = size->width;
+ box->h = size->height;
+ box->d = size->depth;
+}
+
+/*
+ * vmw_surface_tex_dirty_add_range - The dirty_add_range callback for texture
+ * surfaces.
+ */
+static void vmw_surface_tex_dirty_range_add(struct vmw_resource *res,
+ size_t start, size_t end)
+{
+ struct vmw_surface_dirty *dirty =
+ (struct vmw_surface_dirty *) res->dirty;
+ size_t backup_end = res->backup_offset + res->backup_size;
+ struct svga3dsurface_loc loc1, loc2;
+ const struct svga3dsurface_cache *cache;
+
+ start = max_t(size_t, start, res->backup_offset) - res->backup_offset;
+ end = min(end, backup_end) - res->backup_offset;
+ cache = &dirty->cache;
+ svga3dsurface_get_loc(cache, &loc1, start);
+ svga3dsurface_get_loc(cache, &loc2, end - 1);
+ svga3dsurface_inc_loc(cache, &loc2);
+
+ if (loc1.sub_resource + 1 == loc2.sub_resource) {
+ /* Dirty range covers a single sub-resource */
+ vmw_subres_dirty_add(dirty, &loc1, &loc2);
+ } else {
+ /* Dirty range covers multiple sub-resources */
+ struct svga3dsurface_loc loc_min, loc_max;
+ u32 sub_res = loc1.sub_resource;
+
+ svga3dsurface_max_loc(cache, loc1.sub_resource, &loc_max);
+ vmw_subres_dirty_add(dirty, &loc1, &loc_max);
+ svga3dsurface_min_loc(cache, loc2.sub_resource - 1, &loc_min);
+ vmw_subres_dirty_add(dirty, &loc_min, &loc2);
+ for (sub_res = loc1.sub_resource + 1;
+ sub_res < loc2.sub_resource - 1; ++sub_res)
+ vmw_subres_dirty_full(dirty, sub_res);
+ }
+}
+
+/*
+ * vmw_surface_tex_dirty_add_range - The dirty_add_range callback for buffer
+ * surfaces.
+ */
+static void vmw_surface_buf_dirty_range_add(struct vmw_resource *res,
+ size_t start, size_t end)
+{
+ struct vmw_surface_dirty *dirty =
+ (struct vmw_surface_dirty *) res->dirty;
+ const struct svga3dsurface_cache *cache = &dirty->cache;
+ size_t backup_end = res->backup_offset + cache->mip_chain_bytes;
+ SVGA3dBox *box = &dirty->boxes[0];
+ u32 box_c2;
+
+ box->h = box->d = 1;
+ start = max_t(size_t, start, res->backup_offset) - res->backup_offset;
+ end = min(end, backup_end) - res->backup_offset;
+ box_c2 = box->x + box->w;
+ if (box->w == 0 || box->x > start)
+ box->x = start;
+ if (box_c2 < end)
+ box->w = end - box->x;
+}
+
+/*
+ * vmw_surface_tex_dirty_add_range - The dirty_add_range callback for surfaces
+ */
+static void vmw_surface_dirty_range_add(struct vmw_resource *res, size_t start,
+ size_t end)
+{
+ struct vmw_surface *srf = vmw_res_to_srf(res);
+
+ if (WARN_ON(end <= res->backup_offset ||
+ start >= res->backup_offset + res->backup_size))
+ return;
+
+ if (srf->format == SVGA3D_BUFFER)
+ vmw_surface_buf_dirty_range_add(res, start, end);
+ else
+ vmw_surface_tex_dirty_range_add(res, start, end);
+}
+
+/*
+ * vmw_surface_dirty_sync - The surface's dirty_sync callback.
+ */
+static int vmw_surface_dirty_sync(struct vmw_resource *res)
+{
+ struct vmw_private *dev_priv = res->dev_priv;
+ bool has_dx = 0;
+ u32 i, num_dirty;
+ struct vmw_surface_dirty *dirty =
+ (struct vmw_surface_dirty *) res->dirty;
+ size_t alloc_size;
+ const struct svga3dsurface_cache *cache = &dirty->cache;
+ struct {
+ SVGA3dCmdHeader header;
+ SVGA3dCmdDXUpdateSubResource body;
+ } *cmd1;
+ struct {
+ SVGA3dCmdHeader header;
+ SVGA3dCmdUpdateGBImage body;
+ } *cmd2;
+ void *cmd;
+
+ num_dirty = 0;
+ for (i = 0; i < dirty->num_subres; ++i) {
+ const SVGA3dBox *box = &dirty->boxes[i];
+
+ if (box->d)
+ num_dirty++;
+ }
+
+ if (!num_dirty)
+ goto out;
+
+ alloc_size = num_dirty * ((has_dx) ? sizeof(*cmd1) : sizeof(*cmd2));
+ cmd = VMW_FIFO_RESERVE(dev_priv, alloc_size);
+ if (!cmd)
+ return -ENOMEM;
+
+ cmd1 = cmd;
+ cmd2 = cmd;
+
+ for (i = 0; i < dirty->num_subres; ++i) {
+ const SVGA3dBox *box = &dirty->boxes[i];
+
+ if (!box->d)
+ continue;
+
+ /*
+ * DX_UPDATE_SUBRESOURCE is aware of array surfaces.
+ * UPDATE_GB_IMAGE is not.
+ */
+ if (has_dx) {
+ cmd1->header.id = SVGA_3D_CMD_DX_UPDATE_SUBRESOURCE;
+ cmd1->header.size = sizeof(cmd1->body);
+ cmd1->body.sid = res->id;
+ cmd1->body.subResource = i;
+ cmd1->body.box = *box;
+ cmd1++;
+ } else {
+ cmd2->header.id = SVGA_3D_CMD_UPDATE_GB_IMAGE;
+ cmd2->header.size = sizeof(cmd2->body);
+ cmd2->body.image.sid = res->id;
+ cmd2->body.image.face = i / cache->num_mip_levels;
+ cmd2->body.image.mipmap = i -
+ (cache->num_mip_levels * cmd2->body.image.face);
+ cmd2->body.box = *box;
+ cmd2++;
+ }
+
+ }
+ vmw_fifo_commit(dev_priv, alloc_size);
+ out:
+ memset(&dirty->boxes[0], 0, sizeof(dirty->boxes[0]) *
+ dirty->num_subres);
+
+ return 0;
+}
+
+/*
+ * vmw_surface_dirty_alloc - The surface's dirty_alloc callback.
+ */
+static int vmw_surface_dirty_alloc(struct vmw_resource *res)
+{
+ struct vmw_surface *srf = vmw_res_to_srf(res);
+ struct vmw_surface_dirty *dirty;
+ u32 num_layers = 1;
+ u32 num_mip;
+ u32 num_subres;
+ u32 num_samples;
+ size_t dirty_size, acc_size;
+ static struct ttm_operation_ctx ctx = {
+ .interruptible = false,
+ .no_wait_gpu = false
+ };
+ int ret;
+
+ if (srf->array_size)
+ num_layers = srf->array_size;
+ else if (srf->flags & SVGA3D_SURFACE_CUBEMAP)
+ num_layers *= SVGA3D_MAX_SURFACE_FACES;
+
+ num_mip = srf->mip_levels[0];
+ if (!num_mip)
+ num_mip = 1;
+
+ num_subres = num_layers * num_mip;
+ dirty_size = sizeof(*dirty) + num_subres * sizeof(dirty->boxes[0]);
+ acc_size = ttm_round_pot(dirty_size);
+ ret = ttm_mem_global_alloc(vmw_mem_glob(res->dev_priv),
+ acc_size, &ctx);
+ if (ret) {
+ VMW_DEBUG_USER("Out of graphics memory for surface "
+ "dirty tracker.\n");
+ return ret;
+ }
+
+ dirty = kvzalloc(dirty_size, GFP_KERNEL);
+ if (!dirty) {
+ ret = -ENOMEM;
+ goto out_no_dirty;
+ }
+
+ num_samples = max_t(u32, 1, srf->multisample_count);
+ ret = svga3dsurface_setup_cache(&srf->base_size, srf->format, num_mip,
+ num_layers, num_samples, &dirty->cache);
+ if (ret)
+ goto out_no_cache;
+
+ dirty->num_subres = num_subres;
+ dirty->size = acc_size;
+ res->dirty = (struct vmw_resource_dirty *) dirty;
+
+ return 0;
+
+out_no_cache:
+ kvfree(dirty);
+out_no_dirty:
+ ttm_mem_global_free(vmw_mem_glob(res->dev_priv), acc_size);
+ return ret;
+}
+
+/*
+ * vmw_surface_dirty_free - The surface's dirty_free callback
+ */
+static void vmw_surface_dirty_free(struct vmw_resource *res)
+{
+ struct vmw_surface_dirty *dirty =
+ (struct vmw_surface_dirty *) res->dirty;
+ size_t acc_size = dirty->size;
+
+ kvfree(dirty);
+ ttm_mem_global_free(vmw_mem_glob(res->dev_priv), acc_size);
+ res->dirty = NULL;
+}
+
+/*
+ * vmw_surface_clean - The surface's clean callback
+ */
+static int vmw_surface_clean(struct vmw_resource *res)
+{
+ struct vmw_private *dev_priv = res->dev_priv;
+ size_t alloc_size;
+ struct {
+ SVGA3dCmdHeader header;
+ SVGA3dCmdReadbackGBSurface body;
+ } *cmd;
+
+ alloc_size = sizeof(*cmd);
+ cmd = VMW_FIFO_RESERVE(dev_priv, alloc_size);
+ if (!cmd)
+ return -ENOMEM;
+
+ cmd->header.id = SVGA_3D_CMD_READBACK_GB_SURFACE;
+ cmd->header.size = sizeof(cmd->body);
+ cmd->body.sid = res->id;
+ vmw_fifo_commit(dev_priv, alloc_size);
+
+ return 0;
+}
diff --git a/include/uapi/drm/vmwgfx_drm.h b/include/uapi/drm/vmwgfx_drm.h
index 399f58317cff..02cab33f2f25 100644
--- a/include/uapi/drm/vmwgfx_drm.h
+++ b/include/uapi/drm/vmwgfx_drm.h
@@ -891,11 +891,13 @@ struct drm_vmw_shader_arg {
* surface.
* @drm_vmw_surface_flag_create_buffer: Create a backup buffer if none is
* given.
+ * @drm_vmw_surface_flag_coherent: Back surface with coherent memory.
*/
enum drm_vmw_surface_flags {
drm_vmw_surface_flag_shareable = (1 << 0),
drm_vmw_surface_flag_scanout = (1 << 1),
- drm_vmw_surface_flag_create_buffer = (1 << 2)
+ drm_vmw_surface_flag_create_buffer = (1 << 2),
+ drm_vmw_surface_flag_coherent = (1 << 3),
};
/**
--
2.20.1
From: Thomas Hellstrom <[email protected]>
With the vmwgfx dirty tracking, the default TTM fault handler is not
completely sufficient (vmwgfx need to modify the vma->vm_flags member,
and also needs to restrict the number of prefaults).
We also want to replicate the new ttm_bo_vm_reserve() functionality
So start turning the TTM vm code into helpers: ttm_bo_vm_fault_reserved()
and ttm_bo_vm_reserve(), and provide a default TTM fault handler for other
drivers to use.
Cc: "Christian König" <[email protected]>
Signed-off-by: Thomas Hellstrom <[email protected]>
Reviewed-by: "Christian König" <[email protected]> #v1
---
drivers/gpu/drm/ttm/ttm_bo_vm.c | 175 +++++++++++++++++++-------------
include/drm/ttm/ttm_bo_api.h | 10 ++
2 files changed, 113 insertions(+), 72 deletions(-)
diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c b/drivers/gpu/drm/ttm/ttm_bo_vm.c
index 196e13a0adad..2d9862fcf6fd 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_vm.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c
@@ -42,8 +42,6 @@
#include <linux/uaccess.h>
#include <linux/mem_encrypt.h>
-#define TTM_BO_VM_NUM_PREFAULT 16
-
static vm_fault_t ttm_bo_vm_fault_idle(struct ttm_buffer_object *bo,
struct vm_fault *vmf)
{
@@ -106,31 +104,30 @@ static unsigned long ttm_bo_io_mem_pfn(struct ttm_buffer_object *bo,
+ page_offset;
}
-static vm_fault_t ttm_bo_vm_fault(struct vm_fault *vmf)
+/**
+ * ttm_bo_vm_reserve - Reserve a buffer object in a retryable vm callback
+ * @bo: The buffer object
+ * @vmf: The fault structure handed to the callback
+ *
+ * vm callbacks like fault() and *_mkwrite() allow for the mm_sem to be dropped
+ * during long waits, and after the wait the callback will be restarted. This
+ * is to allow other threads using the same virtual memory space concurrent
+ * access to map(), unmap() completely unrelated buffer objects. TTM buffer
+ * object reservations sometimes wait for GPU and should therefore be
+ * considered long waits. This function reserves the buffer object interruptibly
+ * taking this into account. Starvation is avoided by the vm system not
+ * allowing too many repeated restarts.
+ * This function is intended to be used in customized fault() and _mkwrite()
+ * handlers.
+ *
+ * Return:
+ * 0 on success and the bo was reserved.
+ * VM_FAULT_RETRY if blocking wait.
+ * VM_FAULT_NOPAGE if blocking wait and retrying was not allowed.
+ */
+vm_fault_t ttm_bo_vm_reserve(struct ttm_buffer_object *bo,
+ struct vm_fault *vmf)
{
- struct vm_area_struct *vma = vmf->vma;
- struct ttm_buffer_object *bo = (struct ttm_buffer_object *)
- vma->vm_private_data;
- struct ttm_bo_device *bdev = bo->bdev;
- unsigned long page_offset;
- unsigned long page_last;
- unsigned long pfn;
- struct ttm_tt *ttm = NULL;
- struct page *page;
- int err;
- int i;
- vm_fault_t ret = VM_FAULT_NOPAGE;
- unsigned long address = vmf->address;
- struct ttm_mem_type_manager *man =
- &bdev->man[bo->mem.mem_type];
- struct vm_area_struct cvma;
-
- /*
- * Work around locking order reversal in fault / nopfn
- * between mmap_sem and bo_reserve: Perform a trylock operation
- * for reserve, and if it fails, retry the fault after waiting
- * for the buffer to become unreserved.
- */
if (unlikely(!reservation_object_trylock(bo->resv))) {
if (vmf->flags & FAULT_FLAG_ALLOW_RETRY) {
if (!(vmf->flags & FAULT_FLAG_RETRY_NOWAIT)) {
@@ -151,14 +148,55 @@ static vm_fault_t ttm_bo_vm_fault(struct vm_fault *vmf)
return VM_FAULT_NOPAGE;
}
+ return 0;
+}
+EXPORT_SYMBOL(ttm_bo_vm_reserve);
+
+/**
+ * ttm_bo_vm_fault_reserved - TTM fault helper
+ * @vmf: The struct vm_fault given as argument to the fault callback
+ * @prot: The page protection to be used for this memory area.
+ * @num_prefault: Maximum number of prefault pages. The caller may want to
+ * specify this based on madvice settings and the size of the GPU object
+ * backed by the memory.
+ *
+ * This function inserts one or more page table entries pointing to the
+ * memory backing the buffer object, and then returns a return code
+ * instructing the caller to retry the page access.
+ *
+ * Return:
+ * VM_FAULT_NOPAGE on success or pending signal
+ * VM_FAULT_SIGBUS on unspecified error
+ * VM_FAULT_OOM on out-of-memory
+ * VM_FAULT_RETRY if retryable wait
+ */
+vm_fault_t ttm_bo_vm_fault_reserved(struct vm_fault *vmf,
+ pgprot_t prot,
+ pgoff_t num_prefault)
+{
+ struct vm_area_struct *vma = vmf->vma;
+ struct vm_area_struct cvma = *vma;
+ struct ttm_buffer_object *bo = (struct ttm_buffer_object *)
+ vma->vm_private_data;
+ struct ttm_bo_device *bdev = bo->bdev;
+ unsigned long page_offset;
+ unsigned long page_last;
+ unsigned long pfn;
+ struct ttm_tt *ttm = NULL;
+ struct page *page;
+ int err;
+ pgoff_t i;
+ vm_fault_t ret = VM_FAULT_NOPAGE;
+ unsigned long address = vmf->address;
+ struct ttm_mem_type_manager *man =
+ &bdev->man[bo->mem.mem_type];
+
/*
* Refuse to fault imported pages. This should be handled
* (if at all) by redirecting mmap to the exporter.
*/
- if (bo->ttm && (bo->ttm->page_flags & TTM_PAGE_FLAG_SG)) {
- ret = VM_FAULT_SIGBUS;
- goto out_unlock;
- }
+ if (bo->ttm && (bo->ttm->page_flags & TTM_PAGE_FLAG_SG))
+ return VM_FAULT_SIGBUS;
if (bdev->driver->fault_reserve_notify) {
struct dma_fence *moving = dma_fence_get(bo->moving);
@@ -169,11 +207,9 @@ static vm_fault_t ttm_bo_vm_fault(struct vm_fault *vmf)
break;
case -EBUSY:
case -ERESTARTSYS:
- ret = VM_FAULT_NOPAGE;
- goto out_unlock;
+ return VM_FAULT_NOPAGE;
default:
- ret = VM_FAULT_SIGBUS;
- goto out_unlock;
+ return VM_FAULT_SIGBUS;
}
if (bo->moving != moving) {
@@ -189,26 +225,15 @@ static vm_fault_t ttm_bo_vm_fault(struct vm_fault *vmf)
* move.
*/
ret = ttm_bo_vm_fault_idle(bo, vmf);
- if (unlikely(ret != 0)) {
- if (ret == VM_FAULT_RETRY &&
- !(vmf->flags & FAULT_FLAG_RETRY_NOWAIT)) {
- /* The BO has already been unreserved. */
- return ret;
- }
-
- goto out_unlock;
- }
+ if (unlikely(ret != 0))
+ return ret;
err = ttm_mem_io_lock(man, true);
- if (unlikely(err != 0)) {
- ret = VM_FAULT_NOPAGE;
- goto out_unlock;
- }
+ if (unlikely(err != 0))
+ return VM_FAULT_NOPAGE;
err = ttm_mem_io_reserve_vm(bo);
- if (unlikely(err != 0)) {
- ret = VM_FAULT_SIGBUS;
- goto out_io_unlock;
- }
+ if (unlikely(err != 0))
+ return VM_FAULT_SIGBUS;
page_offset = ((address - vma->vm_start) >> PAGE_SHIFT) +
vma->vm_pgoff - drm_vma_node_start(&bo->vma_node);
@@ -220,18 +245,8 @@ static vm_fault_t ttm_bo_vm_fault(struct vm_fault *vmf)
goto out_io_unlock;
}
- /*
- * Make a local vma copy to modify the page_prot member
- * and vm_flags if necessary. The vma parameter is protected
- * by mmap_sem in write mode.
- */
- cvma = *vma;
- cvma.vm_page_prot = vm_get_page_prot(cvma.vm_flags);
-
- if (bo->mem.bus.is_iomem) {
- cvma.vm_page_prot = ttm_io_prot(bo->mem.placement,
- cvma.vm_page_prot);
- } else {
+ cvma.vm_page_prot = ttm_io_prot(bo->mem.placement, prot);
+ if (!bo->mem.bus.is_iomem) {
struct ttm_operation_ctx ctx = {
.interruptible = false,
.no_wait_gpu = false,
@@ -240,24 +255,21 @@ static vm_fault_t ttm_bo_vm_fault(struct vm_fault *vmf)
};
ttm = bo->ttm;
- cvma.vm_page_prot = ttm_io_prot(bo->mem.placement,
- cvma.vm_page_prot);
-
- /* Allocate all page at once, most common usage */
- if (ttm_tt_populate(ttm, &ctx)) {
+ if (ttm_tt_populate(bo->ttm, &ctx)) {
ret = VM_FAULT_OOM;
goto out_io_unlock;
}
+ } else {
+ /* Iomem should not be marked encrypted */
+ cvma.vm_page_prot = pgprot_decrypted(cvma.vm_page_prot);
}
/*
* Speculatively prefault a number of pages. Only error on
* first page.
*/
- for (i = 0; i < TTM_BO_VM_NUM_PREFAULT; ++i) {
+ for (i = 0; i < num_prefault; ++i) {
if (bo->mem.bus.is_iomem) {
- /* Iomem should not be marked encrypted */
- cvma.vm_page_prot = pgprot_decrypted(cvma.vm_page_prot);
pfn = ttm_bo_io_mem_pfn(bo, page_offset);
} else {
page = ttm->pages[page_offset];
@@ -295,7 +307,26 @@ static vm_fault_t ttm_bo_vm_fault(struct vm_fault *vmf)
ret = VM_FAULT_NOPAGE;
out_io_unlock:
ttm_mem_io_unlock(man);
-out_unlock:
+ return ret;
+}
+EXPORT_SYMBOL(ttm_bo_vm_fault_reserved);
+
+static vm_fault_t ttm_bo_vm_fault(struct vm_fault *vmf)
+{
+ struct vm_area_struct *vma = vmf->vma;
+ pgprot_t prot;
+ struct ttm_buffer_object *bo = vma->vm_private_data;
+ vm_fault_t ret;
+
+ ret = ttm_bo_vm_reserve(bo, vmf);
+ if (ret)
+ return ret;
+
+ prot = vm_get_page_prot(vma->vm_flags);
+ ret = ttm_bo_vm_fault_reserved(vmf, prot, TTM_BO_VM_NUM_PREFAULT);
+ if (ret == VM_FAULT_RETRY && !(vmf->flags & FAULT_FLAG_RETRY_NOWAIT))
+ return ret;
+
reservation_object_unlock(bo->resv);
return ret;
}
diff --git a/include/drm/ttm/ttm_bo_api.h b/include/drm/ttm/ttm_bo_api.h
index 49d9cdfc58f2..435d02f719a8 100644
--- a/include/drm/ttm/ttm_bo_api.h
+++ b/include/drm/ttm/ttm_bo_api.h
@@ -768,4 +768,14 @@ int ttm_bo_swapout(struct ttm_bo_global *glob,
struct ttm_operation_ctx *ctx);
void ttm_bo_swapout_all(struct ttm_bo_device *bdev);
int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo);
+
+/* Default number of pre-faulted pages in the TTM fault handler */
+#define TTM_BO_VM_NUM_PREFAULT 16
+
+vm_fault_t ttm_bo_vm_reserve(struct ttm_buffer_object *bo,
+ struct vm_fault *vmf);
+
+vm_fault_t ttm_bo_vm_fault_reserved(struct vm_fault *vmf,
+ pgprot_t prot,
+ pgoff_t num_prefault);
#endif
--
2.20.1
From: Thomas Hellstrom <[email protected]>
With emulated coherent memory we need to be able to quickly look up
a resource from the MOB offset. Instead of traversing a linked list with
O(n) worst case, use an RBtree with O(log n) worst case complexity.
Signed-off-by: Thomas Hellstrom <[email protected]>
Reviewed-by: Deepak Rawat <[email protected]>
---
drivers/gpu/drm/vmwgfx/vmwgfx_bo.c | 5 ++--
drivers/gpu/drm/vmwgfx/vmwgfx_drv.h | 10 +++----
drivers/gpu/drm/vmwgfx/vmwgfx_resource.c | 33 +++++++++++++++++-------
3 files changed, 32 insertions(+), 16 deletions(-)
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c b/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c
index 90ca866640fe..e8bc7a7ac031 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c
@@ -464,6 +464,7 @@ void vmw_bo_bo_free(struct ttm_buffer_object *bo)
struct vmw_buffer_object *vmw_bo = vmw_buffer_object(bo);
WARN_ON(vmw_bo->dirty);
+ WARN_ON(!RB_EMPTY_ROOT(&vmw_bo->res_tree));
vmw_bo_unmap(vmw_bo);
kfree(vmw_bo);
}
@@ -480,6 +481,7 @@ static void vmw_user_bo_destroy(struct ttm_buffer_object *bo)
struct vmw_buffer_object *vbo = &vmw_user_bo->vbo;
WARN_ON(vbo->dirty);
+ WARN_ON(!RB_EMPTY_ROOT(&vbo->res_tree));
vmw_bo_unmap(vbo);
ttm_prime_object_kfree(vmw_user_bo, prime);
}
@@ -515,8 +517,7 @@ int vmw_bo_init(struct vmw_private *dev_priv,
memset(vmw_bo, 0, sizeof(*vmw_bo));
BUILD_BUG_ON(TTM_MAX_BO_PRIORITY <= 3);
vmw_bo->base.priority = 3;
-
- INIT_LIST_HEAD(&vmw_bo->res_list);
+ vmw_bo->res_tree = RB_ROOT;
ret = ttm_bo_init(bdev, &vmw_bo->base, size,
ttm_bo_type_device, placement,
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
index 27c259395790..9b347923196f 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
@@ -89,7 +89,7 @@ struct vmw_fpriv {
/**
* struct vmw_buffer_object - TTM buffer object with vmwgfx additions
* @base: The TTM buffer object
- * @res_list: List of resources using this buffer object as a backing MOB
+ * @res_tree: RB tree of resources using this buffer object as a backing MOB
* @pin_count: pin depth
* @dx_query_ctx: DX context if this buffer object is used as a DX query MOB
* @map: Kmap object for semi-persistent mappings
@@ -98,7 +98,7 @@ struct vmw_fpriv {
*/
struct vmw_buffer_object {
struct ttm_buffer_object base;
- struct list_head res_list;
+ struct rb_root res_tree;
s32 pin_count;
/* Not ref-counted. Protected by binding_mutex */
struct vmw_resource *dx_query_ctx;
@@ -146,8 +146,8 @@ struct vmw_res_func;
* pin-count greater than zero. It is not on the resource LRU lists and its
* backup buffer is pinned. Hence it can't be evicted.
* @func: Method vtable for this resource. Immutable.
+ * @mob_node; Node for the MOB backup rbtree. Protected by @backup reserved.
* @lru_head: List head for the LRU list. Protected by @dev_priv::resource_lock.
- * @mob_head: List head for the MOB backup list. Protected by @backup reserved.
* @binding_head: List head for the context binding list. Protected by
* the @dev_priv::binding_mutex
* @res_free: The resource destructor.
@@ -168,8 +168,8 @@ struct vmw_resource {
unsigned long backup_offset;
unsigned long pin_count;
const struct vmw_res_func *func;
+ struct rb_node mob_node;
struct list_head lru_head;
- struct list_head mob_head;
struct list_head binding_head;
struct vmw_resource_dirty *dirty;
void (*res_free) (struct vmw_resource *res);
@@ -742,7 +742,7 @@ void vmw_resource_dirty_update(struct vmw_resource *res, pgoff_t start,
*/
static inline bool vmw_resource_mob_attached(const struct vmw_resource *res)
{
- return !list_empty(&res->mob_head);
+ return !RB_EMPTY_NODE(&res->mob_node);
}
/**
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c b/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
index da9afa83fb4f..b84dd5953886 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
@@ -41,11 +41,24 @@
void vmw_resource_mob_attach(struct vmw_resource *res)
{
struct vmw_buffer_object *backup = res->backup;
+ struct rb_node **new = &backup->res_tree.rb_node, *parent = NULL;
lockdep_assert_held(&backup->base.resv->lock.base);
res->used_prio = (res->res_dirty) ? res->func->dirty_prio :
res->func->prio;
- list_add_tail(&res->mob_head, &backup->res_list);
+
+ while (*new) {
+ struct vmw_resource *this =
+ container_of(*new, struct vmw_resource, mob_node);
+
+ parent = *new;
+ new = (res->backup_offset < this->backup_offset) ?
+ &((*new)->rb_left) : &((*new)->rb_right);
+ }
+
+ rb_link_node(&res->mob_node, parent, new);
+ rb_insert_color(&res->mob_node, &backup->res_tree);
+
vmw_bo_prio_add(backup, res->used_prio);
}
@@ -59,7 +72,8 @@ void vmw_resource_mob_detach(struct vmw_resource *res)
lockdep_assert_held(&backup->base.resv->lock.base);
if (vmw_resource_mob_attached(res)) {
- list_del_init(&res->mob_head);
+ rb_erase(&res->mob_node, &backup->res_tree);
+ RB_CLEAR_NODE(&res->mob_node);
vmw_bo_prio_del(backup, res->used_prio);
}
}
@@ -206,8 +220,8 @@ int vmw_resource_init(struct vmw_private *dev_priv, struct vmw_resource *res,
res->res_free = res_free;
res->dev_priv = dev_priv;
res->func = func;
+ RB_CLEAR_NODE(&res->mob_node);
INIT_LIST_HEAD(&res->lru_head);
- INIT_LIST_HEAD(&res->mob_head);
INIT_LIST_HEAD(&res->binding_head);
res->id = -1;
res->backup = NULL;
@@ -756,19 +770,20 @@ int vmw_resource_validate(struct vmw_resource *res, bool intr)
*/
void vmw_resource_unbind_list(struct vmw_buffer_object *vbo)
{
-
- struct vmw_resource *res, *next;
struct ttm_validate_buffer val_buf = {
.bo = &vbo->base,
.num_shared = 0
};
lockdep_assert_held(&vbo->base.resv->lock.base);
- list_for_each_entry_safe(res, next, &vbo->res_list, mob_head) {
- if (!res->func->unbind)
- continue;
+ while (!RB_EMPTY_ROOT(&vbo->res_tree)) {
+ struct rb_node *node = vbo->res_tree.rb_node;
+ struct vmw_resource *res =
+ container_of(node, struct vmw_resource, mob_node);
+
+ if (!WARN_ON_ONCE(!res->func->unbind))
+ (void) res->func->unbind(res, res->res_dirty, &val_buf);
- (void) res->func->unbind(res, res->res_dirty, &val_buf);
res->backup_dirty = true;
res->res_dirty = false;
vmw_resource_mob_detach(res);
--
2.20.1
On Wed, Jun 12, 2019 at 08:42:37AM +0200, Thomas Hellstr?m (VMware) wrote:
> From: Thomas Hellstrom <[email protected]>
>
> Add two utilities to a) write-protect and b) clean all ptes pointing into
> a range of an address space.
> The utilities are intended to aid in tracking dirty pages (either
> driver-allocated system memory or pci device memory).
> The write-protect utility should be used in conjunction with
> page_mkwrite() and pfn_mkwrite() to trigger write page-faults on page
> accesses. Typically one would want to use this on sparse accesses into
> large memory regions. The clean utility should be used to utilize
> hardware dirtying functionality and avoid the overhead of page-faults,
> typically on large accesses into small memory regions.
Please use EXPORT_SYMBOL_GPL, just like for apply_to_page_range and
friends. Also in general new core functionality like this should go
along with the actual user, we don't need to repeat the hmm disaster.
On Wed, Jun 12, 2019 at 08:42:36AM +0200, Thomas Hellstr?m (VMware) wrote:
> From: Thomas Hellstrom <[email protected]>
>
> This is basically apply_to_page_range with added functionality:
> Allocating missing parts of the page table becomes optional, which
> means that the function can be guaranteed not to error if allocation
> is disabled. Also passing of the closure struct and callback function
> becomes different and more in line with how things are done elsewhere.
>
> Finally we keep apply_to_page_range as a wrapper around apply_to_pfn_range
>
> The reason for not using the page-walk code is that we want to perform
> the page-walk on vmas pointing to an address space without requiring the
> mmap_sem to be held rather than on vmas belonging to a process with the
> mmap_sem held.
>
> Notable changes since RFC:
> Don't export apply_to_pfn range.
>
> Cc: Andrew Morton <[email protected]>
> Cc: Matthew Wilcox <[email protected]>
> Cc: Will Deacon <[email protected]>
> Cc: Peter Zijlstra <[email protected]>
> Cc: Rik van Riel <[email protected]>
> Cc: Minchan Kim <[email protected]>
> Cc: Michal Hocko <[email protected]>
> Cc: Huang Ying <[email protected]>
> Cc: Souptick Joarder <[email protected]>
> Cc: "J?r?me Glisse" <[email protected]>
> Cc: [email protected]
> Cc: [email protected]
>
> Signed-off-by: Thomas Hellstrom <[email protected]>
> Reviewed-by: Ralph Campbell <[email protected]> #v1
> ---
> include/linux/mm.h | 10 ++++
> mm/memory.c | 135 ++++++++++++++++++++++++++++++++++-----------
> 2 files changed, 113 insertions(+), 32 deletions(-)
>
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 0e8834ac32b7..3d06ce2a64af 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -2675,6 +2675,16 @@ typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr,
> extern int apply_to_page_range(struct mm_struct *mm, unsigned long address,
> unsigned long size, pte_fn_t fn, void *data);
>
> +struct pfn_range_apply;
> +typedef int (*pter_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr,
> + struct pfn_range_apply *closure);
> +struct pfn_range_apply {
> + struct mm_struct *mm;
> + pter_fn_t ptefn;
> + unsigned int alloc;
> +};
> +extern int apply_to_pfn_range(struct pfn_range_apply *closure,
> + unsigned long address, unsigned long size);
>
> #ifdef CONFIG_PAGE_POISONING
> extern bool page_poisoning_enabled(void);
> diff --git a/mm/memory.c b/mm/memory.c
> index 168f546af1ad..462aa47f8878 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -2032,18 +2032,17 @@ int vm_iomap_memory(struct vm_area_struct *vma, phys_addr_t start, unsigned long
> }
> EXPORT_SYMBOL(vm_iomap_memory);
>
> -static int apply_to_pte_range(struct mm_struct *mm, pmd_t *pmd,
> - unsigned long addr, unsigned long end,
> - pte_fn_t fn, void *data)
> +static int apply_to_pte_range(struct pfn_range_apply *closure, pmd_t *pmd,
> + unsigned long addr, unsigned long end)
> {
> pte_t *pte;
> int err;
> pgtable_t token;
> spinlock_t *uninitialized_var(ptl);
>
> - pte = (mm == &init_mm) ?
> + pte = (closure->mm == &init_mm) ?
> pte_alloc_kernel(pmd, addr) :
> - pte_alloc_map_lock(mm, pmd, addr, &ptl);
> + pte_alloc_map_lock(closure->mm, pmd, addr, &ptl);
> if (!pte)
> return -ENOMEM;
>
> @@ -2054,86 +2053,109 @@ static int apply_to_pte_range(struct mm_struct *mm, pmd_t *pmd,
> token = pmd_pgtable(*pmd);
>
> do {
> - err = fn(pte++, token, addr, data);
> + err = closure->ptefn(pte++, token, addr, closure);
> if (err)
> break;
> } while (addr += PAGE_SIZE, addr != end);
>
> arch_leave_lazy_mmu_mode();
>
> - if (mm != &init_mm)
> + if (closure->mm != &init_mm)
> pte_unmap_unlock(pte-1, ptl);
> return err;
> }
>
> -static int apply_to_pmd_range(struct mm_struct *mm, pud_t *pud,
> - unsigned long addr, unsigned long end,
> - pte_fn_t fn, void *data)
> +static int apply_to_pmd_range(struct pfn_range_apply *closure, pud_t *pud,
> + unsigned long addr, unsigned long end)
> {
> pmd_t *pmd;
> unsigned long next;
> - int err;
> + int err = 0;
>
> BUG_ON(pud_huge(*pud));
>
> - pmd = pmd_alloc(mm, pud, addr);
> + pmd = pmd_alloc(closure->mm, pud, addr);
> if (!pmd)
> return -ENOMEM;
> +
> do {
> next = pmd_addr_end(addr, end);
> - err = apply_to_pte_range(mm, pmd, addr, next, fn, data);
> + if (!closure->alloc && pmd_none_or_clear_bad(pmd))
> + continue;
> + err = apply_to_pte_range(closure, pmd, addr, next);
> if (err)
> break;
> } while (pmd++, addr = next, addr != end);
> return err;
> }
>
> -static int apply_to_pud_range(struct mm_struct *mm, p4d_t *p4d,
> - unsigned long addr, unsigned long end,
> - pte_fn_t fn, void *data)
> +static int apply_to_pud_range(struct pfn_range_apply *closure, p4d_t *p4d,
> + unsigned long addr, unsigned long end)
> {
> pud_t *pud;
> unsigned long next;
> - int err;
> + int err = 0;
>
> - pud = pud_alloc(mm, p4d, addr);
> + pud = pud_alloc(closure->mm, p4d, addr);
> if (!pud)
> return -ENOMEM;
> +
> do {
> next = pud_addr_end(addr, end);
> - err = apply_to_pmd_range(mm, pud, addr, next, fn, data);
> + if (!closure->alloc && pud_none_or_clear_bad(pud))
> + continue;
> + err = apply_to_pmd_range(closure, pud, addr, next);
> if (err)
> break;
> } while (pud++, addr = next, addr != end);
> return err;
> }
>
> -static int apply_to_p4d_range(struct mm_struct *mm, pgd_t *pgd,
> - unsigned long addr, unsigned long end,
> - pte_fn_t fn, void *data)
> +static int apply_to_p4d_range(struct pfn_range_apply *closure, pgd_t *pgd,
> + unsigned long addr, unsigned long end)
> {
> p4d_t *p4d;
> unsigned long next;
> - int err;
> + int err = 0;
>
> - p4d = p4d_alloc(mm, pgd, addr);
> + p4d = p4d_alloc(closure->mm, pgd, addr);
> if (!p4d)
> return -ENOMEM;
> +
> do {
> next = p4d_addr_end(addr, end);
> - err = apply_to_pud_range(mm, p4d, addr, next, fn, data);
> + if (!closure->alloc && p4d_none_or_clear_bad(p4d))
> + continue;
> + err = apply_to_pud_range(closure, p4d, addr, next);
> if (err)
> break;
> } while (p4d++, addr = next, addr != end);
> return err;
> }
>
> -/*
> - * Scan a region of virtual memory, filling in page tables as necessary
> - * and calling a provided function on each leaf page table.
> +/**
> + * apply_to_pfn_range - Scan a region of virtual memory, calling a provided
> + * function on each leaf page table entry
> + * @closure: Details about how to scan and what function to apply
> + * @addr: Start virtual address
> + * @size: Size of the region
> + *
> + * If @closure->alloc is set to 1, the function will fill in the page table
> + * as necessary. Otherwise it will skip non-present parts.
> + * Note: The caller must ensure that the range does not contain huge pages.
> + * The caller must also assure that the proper mmu_notifier functions are
> + * called before and after the call to apply_to_pfn_range.
> + *
> + * WARNING: Do not use this function unless you know exactly what you are
> + * doing. It is lacking support for huge pages and transparent huge pages.
> + *
> + * Return: Zero on success. If the provided function returns a non-zero status,
> + * the page table walk will terminate and that status will be returned.
> + * If @closure->alloc is set to 1, then this function may also return memory
> + * allocation errors arising from allocating page table memory.
> */
> -int apply_to_page_range(struct mm_struct *mm, unsigned long addr,
> - unsigned long size, pte_fn_t fn, void *data)
> +int apply_to_pfn_range(struct pfn_range_apply *closure,
> + unsigned long addr, unsigned long size)
> {
> pgd_t *pgd;
> unsigned long next;
> @@ -2143,16 +2165,65 @@ int apply_to_page_range(struct mm_struct *mm, unsigned long addr,
> if (WARN_ON(addr >= end))
> return -EINVAL;
>
> - pgd = pgd_offset(mm, addr);
> + pgd = pgd_offset(closure->mm, addr);
> do {
> next = pgd_addr_end(addr, end);
> - err = apply_to_p4d_range(mm, pgd, addr, next, fn, data);
> + if (!closure->alloc && pgd_none_or_clear_bad(pgd))
> + continue;
> + err = apply_to_p4d_range(closure, pgd, addr, next);
> if (err)
> break;
> } while (pgd++, addr = next, addr != end);
>
> return err;
> }
> +
> +/**
> + * struct page_range_apply - Closure structure for apply_to_page_range()
> + * @pter: The base closure structure we derive from
> + * @fn: The leaf pte function to call
> + * @data: The leaf pte function closure
> + */
> +struct page_range_apply {
> + struct pfn_range_apply pter;
> + pte_fn_t fn;
> + void *data;
> +};
> +
> +/*
> + * Callback wrapper to enable use of apply_to_pfn_range for
> + * the apply_to_page_range interface
> + */
> +static int apply_to_page_range_wrapper(pte_t *pte, pgtable_t token,
> + unsigned long addr,
> + struct pfn_range_apply *pter)
> +{
> + struct page_range_apply *pra =
> + container_of(pter, typeof(*pra), pter);
> +
> + return pra->fn(pte, token, addr, pra->data);
> +}
> +
> +/*
> + * Scan a region of virtual memory, filling in page tables as necessary
> + * and calling a provided function on each leaf page table.
> + *
> + * WARNING: Do not use this function unless you know exactly what you are
> + * doing. It is lacking support for huge pages and transparent huge pages.
> + */
> +int apply_to_page_range(struct mm_struct *mm, unsigned long addr,
> + unsigned long size, pte_fn_t fn, void *data)
> +{
> + struct page_range_apply pra = {
> + .pter = {.mm = mm,
> + .alloc = 1,
> + .ptefn = apply_to_page_range_wrapper },
> + .fn = fn,
> + .data = data
> + };
> +
> + return apply_to_pfn_range(&pra.pter, addr, size);
> +}
>
> EXPORT_SYMBOL_GPL(apply_to_page_range);
Actually - did you look into converting our two hand full of
apply_to_page_range callers to your new scheme? It seems like that
might actually not be to bad and avoid various layers of wrappers.
On Wed, Jun 12, 2019 at 04:23:50AM -0700, Christoph Hellwig wrote:
> friends. Also in general new core functionality like this should go
> along with the actual user, we don't need to repeat the hmm disaster.
Ok, I see you actually did that, it just got hidden by the awful
selective cc stuff a lot of people do at the moment. Sorry for the
noise.
On 6/12/19 1:23 PM, Christoph Hellwig wrote:
> On Wed, Jun 12, 2019 at 08:42:37AM +0200, Thomas Hellström (VMware) wrote:
>> From: Thomas Hellstrom <[email protected]>
>>
>> Add two utilities to a) write-protect and b) clean all ptes pointing into
>> a range of an address space.
>> The utilities are intended to aid in tracking dirty pages (either
>> driver-allocated system memory or pci device memory).
>> The write-protect utility should be used in conjunction with
>> page_mkwrite() and pfn_mkwrite() to trigger write page-faults on page
>> accesses. Typically one would want to use this on sparse accesses into
>> large memory regions. The clean utility should be used to utilize
>> hardware dirtying functionality and avoid the overhead of page-faults,
>> typically on large accesses into small memory regions.
> Please use EXPORT_SYMBOL_GPL, just like for apply_to_page_range and
> friends.
Sounds reasonable if this uses already EXPORT_SYMBOL_GPL'd
functionality. I'll respin.
> Also in general new core functionality like this should go
> along with the actual user, we don't need to repeat the hmm disaster.
I see in your later message that you noticed the other patches. There's
also user-space functionality in mesa that excercises this.
/Thomas
On 6/12/19 2:16 PM, Christoph Hellwig wrote:
> On Wed, Jun 12, 2019 at 08:42:36AM +0200, Thomas Hellström (VMware) wrote:
>> From: Thomas Hellstrom <[email protected]>
>>
>> This is basically apply_to_page_range with added functionality:
>> Allocating missing parts of the page table becomes optional, which
>> means that the function can be guaranteed not to error if allocation
>> is disabled. Also passing of the closure struct and callback function
>> becomes different and more in line with how things are done elsewhere.
>>
>> Finally we keep apply_to_page_range as a wrapper around apply_to_pfn_range
>>
>> The reason for not using the page-walk code is that we want to perform
>> the page-walk on vmas pointing to an address space without requiring the
>> mmap_sem to be held rather than on vmas belonging to a process with the
>> mmap_sem held.
>>
>> Notable changes since RFC:
>> Don't export apply_to_pfn range.
>>
>> Cc: Andrew Morton <[email protected]>
>> Cc: Matthew Wilcox <[email protected]>
>> Cc: Will Deacon <[email protected]>
>> Cc: Peter Zijlstra <[email protected]>
>> Cc: Rik van Riel <[email protected]>
>> Cc: Minchan Kim <[email protected]>
>> Cc: Michal Hocko <[email protected]>
>> Cc: Huang Ying <[email protected]>
>> Cc: Souptick Joarder <[email protected]>
>> Cc: "Jérôme Glisse" <[email protected]>
>> Cc: [email protected]
>> Cc: [email protected]
>>
>> Signed-off-by: Thomas Hellstrom <[email protected]>
>> Reviewed-by: Ralph Campbell <[email protected]> #v1
>> ---
>> include/linux/mm.h | 10 ++++
>> mm/memory.c | 135 ++++++++++++++++++++++++++++++++++-----------
>> 2 files changed, 113 insertions(+), 32 deletions(-)
>>
>> diff --git a/include/linux/mm.h b/include/linux/mm.h
>> index 0e8834ac32b7..3d06ce2a64af 100644
>> --- a/include/linux/mm.h
>> +++ b/include/linux/mm.h
>> @@ -2675,6 +2675,16 @@ typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr,
>> extern int apply_to_page_range(struct mm_struct *mm, unsigned long address,
>> unsigned long size, pte_fn_t fn, void *data);
>>
>> +struct pfn_range_apply;
>> +typedef int (*pter_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr,
>> + struct pfn_range_apply *closure);
>> +struct pfn_range_apply {
>> + struct mm_struct *mm;
>> + pter_fn_t ptefn;
>> + unsigned int alloc;
>> +};
>> +extern int apply_to_pfn_range(struct pfn_range_apply *closure,
>> + unsigned long address, unsigned long size);
>>
>> #ifdef CONFIG_PAGE_POISONING
>> extern bool page_poisoning_enabled(void);
>> diff --git a/mm/memory.c b/mm/memory.c
>> index 168f546af1ad..462aa47f8878 100644
>> --- a/mm/memory.c
>> +++ b/mm/memory.c
>> @@ -2032,18 +2032,17 @@ int vm_iomap_memory(struct vm_area_struct *vma, phys_addr_t start, unsigned long
>> }
>> EXPORT_SYMBOL(vm_iomap_memory);
>>
>> -static int apply_to_pte_range(struct mm_struct *mm, pmd_t *pmd,
>> - unsigned long addr, unsigned long end,
>> - pte_fn_t fn, void *data)
>> +static int apply_to_pte_range(struct pfn_range_apply *closure, pmd_t *pmd,
>> + unsigned long addr, unsigned long end)
>> {
>> pte_t *pte;
>> int err;
>> pgtable_t token;
>> spinlock_t *uninitialized_var(ptl);
>>
>> - pte = (mm == &init_mm) ?
>> + pte = (closure->mm == &init_mm) ?
>> pte_alloc_kernel(pmd, addr) :
>> - pte_alloc_map_lock(mm, pmd, addr, &ptl);
>> + pte_alloc_map_lock(closure->mm, pmd, addr, &ptl);
>> if (!pte)
>> return -ENOMEM;
>>
>> @@ -2054,86 +2053,109 @@ static int apply_to_pte_range(struct mm_struct *mm, pmd_t *pmd,
>> token = pmd_pgtable(*pmd);
>>
>> do {
>> - err = fn(pte++, token, addr, data);
>> + err = closure->ptefn(pte++, token, addr, closure);
>> if (err)
>> break;
>> } while (addr += PAGE_SIZE, addr != end);
>>
>> arch_leave_lazy_mmu_mode();
>>
>> - if (mm != &init_mm)
>> + if (closure->mm != &init_mm)
>> pte_unmap_unlock(pte-1, ptl);
>> return err;
>> }
>>
>> -static int apply_to_pmd_range(struct mm_struct *mm, pud_t *pud,
>> - unsigned long addr, unsigned long end,
>> - pte_fn_t fn, void *data)
>> +static int apply_to_pmd_range(struct pfn_range_apply *closure, pud_t *pud,
>> + unsigned long addr, unsigned long end)
>> {
>> pmd_t *pmd;
>> unsigned long next;
>> - int err;
>> + int err = 0;
>>
>> BUG_ON(pud_huge(*pud));
>>
>> - pmd = pmd_alloc(mm, pud, addr);
>> + pmd = pmd_alloc(closure->mm, pud, addr);
>> if (!pmd)
>> return -ENOMEM;
>> +
>> do {
>> next = pmd_addr_end(addr, end);
>> - err = apply_to_pte_range(mm, pmd, addr, next, fn, data);
>> + if (!closure->alloc && pmd_none_or_clear_bad(pmd))
>> + continue;
>> + err = apply_to_pte_range(closure, pmd, addr, next);
>> if (err)
>> break;
>> } while (pmd++, addr = next, addr != end);
>> return err;
>> }
>>
>> -static int apply_to_pud_range(struct mm_struct *mm, p4d_t *p4d,
>> - unsigned long addr, unsigned long end,
>> - pte_fn_t fn, void *data)
>> +static int apply_to_pud_range(struct pfn_range_apply *closure, p4d_t *p4d,
>> + unsigned long addr, unsigned long end)
>> {
>> pud_t *pud;
>> unsigned long next;
>> - int err;
>> + int err = 0;
>>
>> - pud = pud_alloc(mm, p4d, addr);
>> + pud = pud_alloc(closure->mm, p4d, addr);
>> if (!pud)
>> return -ENOMEM;
>> +
>> do {
>> next = pud_addr_end(addr, end);
>> - err = apply_to_pmd_range(mm, pud, addr, next, fn, data);
>> + if (!closure->alloc && pud_none_or_clear_bad(pud))
>> + continue;
>> + err = apply_to_pmd_range(closure, pud, addr, next);
>> if (err)
>> break;
>> } while (pud++, addr = next, addr != end);
>> return err;
>> }
>>
>> -static int apply_to_p4d_range(struct mm_struct *mm, pgd_t *pgd,
>> - unsigned long addr, unsigned long end,
>> - pte_fn_t fn, void *data)
>> +static int apply_to_p4d_range(struct pfn_range_apply *closure, pgd_t *pgd,
>> + unsigned long addr, unsigned long end)
>> {
>> p4d_t *p4d;
>> unsigned long next;
>> - int err;
>> + int err = 0;
>>
>> - p4d = p4d_alloc(mm, pgd, addr);
>> + p4d = p4d_alloc(closure->mm, pgd, addr);
>> if (!p4d)
>> return -ENOMEM;
>> +
>> do {
>> next = p4d_addr_end(addr, end);
>> - err = apply_to_pud_range(mm, p4d, addr, next, fn, data);
>> + if (!closure->alloc && p4d_none_or_clear_bad(p4d))
>> + continue;
>> + err = apply_to_pud_range(closure, p4d, addr, next);
>> if (err)
>> break;
>> } while (p4d++, addr = next, addr != end);
>> return err;
>> }
>>
>> -/*
>> - * Scan a region of virtual memory, filling in page tables as necessary
>> - * and calling a provided function on each leaf page table.
>> +/**
>> + * apply_to_pfn_range - Scan a region of virtual memory, calling a provided
>> + * function on each leaf page table entry
>> + * @closure: Details about how to scan and what function to apply
>> + * @addr: Start virtual address
>> + * @size: Size of the region
>> + *
>> + * If @closure->alloc is set to 1, the function will fill in the page table
>> + * as necessary. Otherwise it will skip non-present parts.
>> + * Note: The caller must ensure that the range does not contain huge pages.
>> + * The caller must also assure that the proper mmu_notifier functions are
>> + * called before and after the call to apply_to_pfn_range.
>> + *
>> + * WARNING: Do not use this function unless you know exactly what you are
>> + * doing. It is lacking support for huge pages and transparent huge pages.
>> + *
>> + * Return: Zero on success. If the provided function returns a non-zero status,
>> + * the page table walk will terminate and that status will be returned.
>> + * If @closure->alloc is set to 1, then this function may also return memory
>> + * allocation errors arising from allocating page table memory.
>> */
>> -int apply_to_page_range(struct mm_struct *mm, unsigned long addr,
>> - unsigned long size, pte_fn_t fn, void *data)
>> +int apply_to_pfn_range(struct pfn_range_apply *closure,
>> + unsigned long addr, unsigned long size)
>> {
>> pgd_t *pgd;
>> unsigned long next;
>> @@ -2143,16 +2165,65 @@ int apply_to_page_range(struct mm_struct *mm, unsigned long addr,
>> if (WARN_ON(addr >= end))
>> return -EINVAL;
>>
>> - pgd = pgd_offset(mm, addr);
>> + pgd = pgd_offset(closure->mm, addr);
>> do {
>> next = pgd_addr_end(addr, end);
>> - err = apply_to_p4d_range(mm, pgd, addr, next, fn, data);
>> + if (!closure->alloc && pgd_none_or_clear_bad(pgd))
>> + continue;
>> + err = apply_to_p4d_range(closure, pgd, addr, next);
>> if (err)
>> break;
>> } while (pgd++, addr = next, addr != end);
>>
>> return err;
>> }
>> +
>> +/**
>> + * struct page_range_apply - Closure structure for apply_to_page_range()
>> + * @pter: The base closure structure we derive from
>> + * @fn: The leaf pte function to call
>> + * @data: The leaf pte function closure
>> + */
>> +struct page_range_apply {
>> + struct pfn_range_apply pter;
>> + pte_fn_t fn;
>> + void *data;
>> +};
>> +
>> +/*
>> + * Callback wrapper to enable use of apply_to_pfn_range for
>> + * the apply_to_page_range interface
>> + */
>> +static int apply_to_page_range_wrapper(pte_t *pte, pgtable_t token,
>> + unsigned long addr,
>> + struct pfn_range_apply *pter)
>> +{
>> + struct page_range_apply *pra =
>> + container_of(pter, typeof(*pra), pter);
>> +
>> + return pra->fn(pte, token, addr, pra->data);
>> +}
>> +
>> +/*
>> + * Scan a region of virtual memory, filling in page tables as necessary
>> + * and calling a provided function on each leaf page table.
>> + *
>> + * WARNING: Do not use this function unless you know exactly what you are
>> + * doing. It is lacking support for huge pages and transparent huge pages.
>> + */
>> +int apply_to_page_range(struct mm_struct *mm, unsigned long addr,
>> + unsigned long size, pte_fn_t fn, void *data)
>> +{
>> + struct page_range_apply pra = {
>> + .pter = {.mm = mm,
>> + .alloc = 1,
>> + .ptefn = apply_to_page_range_wrapper },
>> + .fn = fn,
>> + .data = data
>> + };
>> +
>> + return apply_to_pfn_range(&pra.pter, addr, size);
>> +}
>>
>> EXPORT_SYMBOL_GPL(apply_to_page_range);
> Actually - did you look into converting our two hand full of
> apply_to_page_range callers to your new scheme? It seems like that
> might actually not be to bad and avoid various layers of wrappers.
Yes, I had that in mind once this landed and got some serious testing.
/Thomas
Hi!
On Thu, 2019-06-13 at 12:25 +0800, Hillf Danton wrote:
> Hello Thomas
>
> On Wed, 12 Jun 2019 08:42:39 +0200 Thomas Hellstrom wrote:
> > From: Thomas Hellstrom <[email protected]>
> >
> > With the vmwgfx dirty tracking, the default TTM fault handler is
> > not
> > completely sufficient (vmwgfx need to modify the vma->vm_flags
> > member,
> > and also needs to restrict the number of prefaults).
> >
> > We also want to replicate the new ttm_bo_vm_reserve() functionality
> >
> > So start turning the TTM vm code into helpers:
> > ttm_bo_vm_fault_reserved()
> > and ttm_bo_vm_reserve(), and provide a default TTM fault handler
> > for other
> > drivers to use.
> >
> > Cc: "Christian König" <[email protected]>
> >
> > Signed-off-by: Thomas Hellstrom <[email protected]>
> > Reviewed-by: "Christian König" <[email protected]> #v1
> > ---
> > drivers/gpu/drm/ttm/ttm_bo_vm.c | 175 +++++++++++++++++++---------
> > ----
> > include/drm/ttm/ttm_bo_api.h | 10 ++
> > 2 files changed, 113 insertions(+), 72 deletions(-)
> >
> >
...
> > - /*
> > - * Work around locking order reversal in fault / nopfn
> > - * between mmap_sem and bo_reserve: Perform a trylock operation
> > - * for reserve, and if it fails, retry the fault after waiting
> > - * for the buffer to become unreserved.
> > - */
> Is it likely to not cut the comment as the trylock is still there?
Yes, I'll re-add that. It was removed in an early version of the patch
when I actually removed the trylock as well, but I changed my mind on
that.
>
> > if (unlikely(!reservation_object_trylock(bo->resv))) {
> > if (vmf->flags & FAULT_FLAG_ALLOW_RETRY) {
> > if (!(vmf->flags & FAULT_FLAG_RETRY_NOWAIT)) {
> > @@ -151,14 +148,55 @@ static vm_fault_t ttm_bo_vm_fault(struct
> > vm_fault *vmf)
> > return VM_FAULT_NOPAGE;
> > }
> >
> > + return 0;
> > +}
> > +EXPORT_SYMBOL(ttm_bo_vm_reserve);
...
> >
> > - if (unlikely(err != 0)) {
> > - ret = VM_FAULT_SIGBUS;
> > - goto out_io_unlock;
> > - }
> > + if (unlikely(err != 0))
> > + return VM_FAULT_SIGBUS;
> >
> Is it likely a typo to skip the io_unlock?
>
> --
> Hillf
Yes. Good catch. That io_unlock should definitely remain.
I'll respin and resend to dri-devel and lkml only.
Thanks,
Thomas