60 lines
1.3 KiB
C
60 lines
1.3 KiB
C
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#include <drm/drmP.h>
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#include <drm/i915_drm.h>
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#include "i915_drv.h"
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#include "intel_drv.h"
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struct file *shmem_file_setup(const char *name, loff_t size, unsigned long flags)
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{
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struct file *filep;
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int count;
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filep = malloc(sizeof(*filep));
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if(unlikely(filep == NULL))
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return ERR_PTR(-ENOMEM);
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count = size / PAGE_SIZE;
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filep->pages = kzalloc(sizeof(struct page *) * count, 0);
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if(unlikely(filep->pages == NULL))
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{
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kfree(filep);
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return ERR_PTR(-ENOMEM);
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};
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filep->count = count;
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filep->allocated = 0;
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filep->vma = NULL;
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// dbgprintf("%s file %p pages %p count %d\n",
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// __FUNCTION__,filep, filep->pages, filep->pages);
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return filep;
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}
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struct page *shmem_read_mapping_page_gfp(struct file *filep,
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pgoff_t index, gfp_t gfp)
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{
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struct page *page;
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// dbgprintf("%s, file %p index %d\n", __FUNCTION__, filep, index);
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if(unlikely(index >= filep->count))
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return ERR_PTR(-EINVAL);
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page = filep->pages[index];
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if(unlikely(page == NULL))
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{
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page = (struct page *)AllocPage();
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if(unlikely(page == NULL))
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return ERR_PTR(-ENOMEM);
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filep->pages[index] = page;
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};
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return page;
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};
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