s390/qdio: add helpers to manage qdio buffers (5245c924) · Commits · 戴 / test

arch/s390/include/asm/qdio.h

+4 −0

Original line number	Diff line number	Diff line
		@@ -415,6 +415,10 @@ struct qdio_brinfo_entry_l2 {
		#define QDIO_FLAG_SYNC_OUTPUT 0x02
		#define QDIO_FLAG_PCI_OUT 0x10

		int qdio_alloc_buffers(struct qdio_buffer **buf, unsigned int count);
		void qdio_free_buffers(struct qdio_buffer **buf, unsigned int count);
		void qdio_reset_buffers(struct qdio_buffer **buf, unsigned int count);

		extern int qdio_allocate(struct qdio_initialize *);
		extern int qdio_establish(struct qdio_initialize *);
		extern int qdio_activate(struct ccw_device *);

drivers/s390/cio/qdio_setup.c

+53 −0

Original line number	Diff line number	Diff line
		@@ -17,6 +17,8 @@
		#include "qdio.h"
		#include "qdio_debug.h"

		#define QBUFF_PER_PAGE (PAGE_SIZE / sizeof(struct qdio_buffer))

		static struct kmem_cache *qdio_q_cache;
		static struct kmem_cache *qdio_aob_cache;

		@@ -32,6 +34,57 @@ void qdio_release_aob(struct qaob *aob)
		}
		EXPORT_SYMBOL_GPL(qdio_release_aob);

		/**
		* qdio_free_buffers() - free qdio buffers
		* @buf: array of pointers to qdio buffers
		* @count: number of qdio buffers to free
		*/
		void qdio_free_buffers(struct qdio_buffer **buf, unsigned int count)
		{
		int pos;

		for (pos = 0; pos < count; pos += QBUFF_PER_PAGE)
		free_page((unsigned long) buf[pos]);
		}
		EXPORT_SYMBOL_GPL(qdio_free_buffers);

		/**
		* qdio_alloc_buffers() - allocate qdio buffers
		* @buf: array of pointers to qdio buffers
		* @count: number of qdio buffers to allocate
		*/
		int qdio_alloc_buffers(struct qdio_buffer **buf, unsigned int count)
		{
		int pos;

		for (pos = 0; pos < count; pos += QBUFF_PER_PAGE) {
		buf[pos] = (void *) get_zeroed_page(GFP_KERNEL);
		if (!buf[pos]) {
		qdio_free_buffers(buf, count);
		return -ENOMEM;
		}
		}
		for (pos = 0; pos < count; pos++)
		if (pos % QBUFF_PER_PAGE)
		buf[pos] = buf[pos - 1] + 1;
		return 0;
		}
		EXPORT_SYMBOL_GPL(qdio_alloc_buffers);

		/**
		* qdio_reset_buffers() - reset qdio buffers
		* @buf: array of pointers to qdio buffers
		* @count: number of qdio buffers that will be zeroed
		*/
		void qdio_reset_buffers(struct qdio_buffer **buf, unsigned int count)
		{
		int pos;

		for (pos = 0; pos < count; pos++)
		memset(buf[pos], 0, sizeof(struct qdio_buffer));
		}
		EXPORT_SYMBOL_GPL(qdio_reset_buffers);

		/*
		* qebsm is only available under 64bit but the adapter sets the feature
		* flag anyway, so we manually override it.

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