search for: pci_p2pdma_add_resourc

...release(void *data) { struct pci_dev *pdev = data; @@ -153,11 +121,6 @@ static int pci_p2pdma_setup(struct pci_dev *pdev) return error; } -static const struct dev_pagemap_ops pci_p2pdma_pagemap_ops = { - .kill = pci_p2pdma_percpu_kill, - .cleanup = pci_p2pdma_percpu_cleanup, -}; - /** * pci_p2pdma_add_resource - add memory for use as p2p memory * @pdev: the device to add the memory to @@ -171,7 +134,6 @@ static const struct dev_pagemap_ops pci_p2pdma_pagemap_ops = { int pci_p2pdma_add_resource(struct pci_dev *pdev, int bar, size_t size, u64 offset) { - struct p2pdma_pagemap *p2p_pgmap; str...

...release(void *data) { struct pci_dev *pdev = data; @@ -153,11 +121,6 @@ static int pci_p2pdma_setup(struct pci_dev *pdev) return error; } -static const struct dev_pagemap_ops pci_p2pdma_pagemap_ops = { - .kill = pci_p2pdma_percpu_kill, - .cleanup = pci_p2pdma_percpu_cleanup, -}; - /** * pci_p2pdma_add_resource - add memory for use as p2p memory * @pdev: the device to add the memory to @@ -171,7 +134,6 @@ static const struct dev_pagemap_ops pci_p2pdma_pagemap_ops = { int pci_p2pdma_add_resource(struct pci_dev *pdev, int bar, size_t size, u64 offset) { - struct p2pdma_pagemap *p2p_pgmap; str...

...gt; @@ -152,6 +152,11 @@ static int pci_p2pdma_setup(struct pci_dev *pdev) > return error; > } > > +static const struct dev_pagemap_ops pci_p2pdma_pagemap_ops = { > + .kill = pci_p2pdma_percpu_kill, > + .cleanup = pci_p2pdma_percpu_cleanup, > +}; > + > /** > * pci_p2pdma_add_resource - add memory for use as p2p memory > * @pdev: the device to add the memory to > @@ -207,8 +212,6 @@ int pci_p2pdma_add_resource(struct pci_dev *pdev, int bar, size_t size, > pgmap->type = MEMORY_DEVICE_PCI_P2PDMA; > pgmap->pci_p2pdma_bus_offset = pci_bus_address(pdev, bar)...

Hi Dan, Jérôme and Jason, below is a series that cleans up the dev_pagemap interface so that it is more easily usable, which removes the need to wrap it in hmm and thus allowing to kill a lot of code Note: this series is on top of the rdma/hmm branch + the dev_pagemap releas fix series from Dan that went into 5.2-rc5. Git tree: git://git.infradead.org/users/hch/misc.git

...index 742928d0053e..6e76380f5b97 100644 --- a/drivers/pci/p2pdma.c +++ b/drivers/pci/p2pdma.c @@ -150,6 +150,10 @@ static int pci_p2pdma_setup(struct pci_dev *pdev) return error; } +static const struct dev_pagemap_ops pci_p2pdma_pagemap_ops = { + .kill = pci_p2pdma_percpu_kill, +}; + /** * pci_p2pdma_add_resource - add memory for use as p2p memory * @pdev: the device to add the memory to @@ -196,7 +200,6 @@ int pci_p2pdma_add_resource(struct pci_dev *pdev, int bar, size_t size, pgmap->type = MEMORY_DEVICE_PCI_P2PDMA; pgmap->pci_p2pdma_bus_offset = pci_bus_address(pdev, bar) - pci_resource_st...

Hi Dan, Jérôme and Jason, below is a series that cleans up the dev_pagemap interface so that it is more easily usable, which removes the need to wrap it in hmm and thus allowing to kill a lot of code Note: this series is on top of Linux 5.2-rc5 and has some minor conflicts with the hmm tree that are easy to resolve. Diffstat summary: 32 files changed, 361 insertions(+), 1012 deletions(-) Git

...ef); } static void pci_p2pdma_release(void *data) @@ -152,6 +152,11 @@ static int pci_p2pdma_setup(struct pci_dev *pdev) return error; } +static const struct dev_pagemap_ops pci_p2pdma_pagemap_ops = { + .kill = pci_p2pdma_percpu_kill, + .cleanup = pci_p2pdma_percpu_cleanup, +}; + /** * pci_p2pdma_add_resource - add memory for use as p2p memory * @pdev: the device to add the memory to @@ -207,8 +212,6 @@ int pci_p2pdma_add_resource(struct pci_dev *pdev, int bar, size_t size, pgmap->type = MEMORY_DEVICE_PCI_P2PDMA; pgmap->pci_p2pdma_bus_offset = pci_bus_address(pdev, bar) - pci_resource_st...

...dma.c +++ b/drivers/pci/p2pdma.c @@ -82,7 +82,7 @@ static void pci_p2pdma_percpu_release(struct percpu_ref *ref) complete_all(&p2p->devmap_ref_done); } -static void pci_p2pdma_percpu_kill(struct percpu_ref *ref) +static void pci_p2pdma_percpu_kill(struct dev_pagemap *pgmap) { /* * pci_p2pdma_add_resource() may be called multiple times @@ -90,10 +90,10 @@ static void pci_p2pdma_percpu_kill(struct percpu_ref *ref) * times. We only want the first action to actually kill the * percpu_ref. */ - if (percpu_ref_is_dying(ref)) + if (percpu_ref_is_dying(pgmap->ref)) return; - percpu_ref_ki...

...ref reference count. Q1: Is that safe? Is there some code that depends on put_page() dropping the pgmap->ref reference count as part of memunmap_pages()? My testing of [1] seems OK but I'm sure there are lots of cases I didn't test. MEMORY_DEVICE_PCI_P2PDMA: Struct pages are created in pci_p2pdma_add_resource() and represent device memory accessible by PCIe bar address space. Memory is allocated with pci_alloc_p2pmem() based on a byte length but the gen_pool_alloc_owner() call will allocate memory in a minimum of PAGE_SIZE units. Reference counting is +1 per *allocation* on the pgmap->ref reference...

On Fri, Nov 06, 2020 at 01:26:50PM -0800, Ralph Campbell wrote: > > On 11/6/20 12:03 AM, Christoph Hellwig wrote: >> I hate the extra pin count magic here. IMHO we really need to finish >> off the series to get rid of the extra references on the ZONE_DEVICE >> pages first. > > First, thanks for the review comments. > > I don't like the extra refcount

Hi Dan, Jérôme and Jason, below is a series that cleans up the dev_pagemap interface so that it is more easily usable, which removes the need to wrap it in hmm and thus allowing to kill a lot of code Diffstat: 22 files changed, 245 insertions(+), 802 deletions(-) Git tree: git://git.infradead.org/users/hch/misc.git hmm-devmem-cleanup Gitweb: